Chris Mason | 6cbd557 | 2007-06-12 09:07:21 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007 Oracle. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public |
| 6 | * License v2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public |
| 14 | * License along with this program; if not, write to the |
| 15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 16 | * Boston, MA 021110-1307, USA. |
| 17 | */ |
Zach Brown | ec6b910 | 2007-07-11 10:00:37 -0400 | [diff] [blame] | 18 | #include <linux/sched.h> |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 19 | #include <linux/pagemap.h> |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 20 | #include <linux/writeback.h> |
David Woodhouse | 21af804 | 2008-08-12 14:13:26 +0100 | [diff] [blame] | 21 | #include <linux/blkdev.h> |
Chris Mason | b7a9f29 | 2009-02-04 09:23:45 -0500 | [diff] [blame] | 22 | #include <linux/sort.h> |
Chris Mason | 4b4e25f | 2008-11-20 10:22:27 -0500 | [diff] [blame] | 23 | #include "compat.h" |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 24 | #include "hash.h" |
Miguel | a5eb62e | 2008-04-11 15:45:51 -0400 | [diff] [blame] | 25 | #include "crc32c.h" |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 26 | #include "ctree.h" |
| 27 | #include "disk-io.h" |
| 28 | #include "print-tree.h" |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 29 | #include "transaction.h" |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 30 | #include "volumes.h" |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 31 | #include "locking.h" |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 32 | #include "ref-cache.h" |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 33 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 34 | #define PENDING_EXTENT_INSERT 0 |
| 35 | #define PENDING_EXTENT_DELETE 1 |
| 36 | #define PENDING_BACKREF_UPDATE 2 |
| 37 | |
| 38 | struct pending_extent_op { |
| 39 | int type; |
| 40 | u64 bytenr; |
| 41 | u64 num_bytes; |
| 42 | u64 parent; |
| 43 | u64 orig_parent; |
| 44 | u64 generation; |
| 45 | u64 orig_generation; |
| 46 | int level; |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 47 | struct list_head list; |
| 48 | int del; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 49 | }; |
| 50 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 51 | static int finish_current_insert(struct btrfs_trans_handle *trans, |
| 52 | struct btrfs_root *extent_root, int all); |
| 53 | static int del_pending_extents(struct btrfs_trans_handle *trans, |
| 54 | struct btrfs_root *extent_root, int all); |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 55 | static int pin_down_bytes(struct btrfs_trans_handle *trans, |
| 56 | struct btrfs_root *root, |
| 57 | u64 bytenr, u64 num_bytes, int is_data); |
| 58 | static int update_block_group(struct btrfs_trans_handle *trans, |
| 59 | struct btrfs_root *root, |
| 60 | u64 bytenr, u64 num_bytes, int alloc, |
| 61 | int mark_free); |
Yan | d548ee5 | 2008-01-03 13:56:30 -0500 | [diff] [blame] | 62 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 63 | static int block_group_bits(struct btrfs_block_group_cache *cache, u64 bits) |
| 64 | { |
| 65 | return (cache->flags & bits) == bits; |
| 66 | } |
| 67 | |
| 68 | /* |
| 69 | * this adds the block group to the fs_info rb tree for the block group |
| 70 | * cache |
| 71 | */ |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 72 | static int btrfs_add_block_group_cache(struct btrfs_fs_info *info, |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 73 | struct btrfs_block_group_cache *block_group) |
| 74 | { |
| 75 | struct rb_node **p; |
| 76 | struct rb_node *parent = NULL; |
| 77 | struct btrfs_block_group_cache *cache; |
| 78 | |
| 79 | spin_lock(&info->block_group_cache_lock); |
| 80 | p = &info->block_group_cache_tree.rb_node; |
| 81 | |
| 82 | while (*p) { |
| 83 | parent = *p; |
| 84 | cache = rb_entry(parent, struct btrfs_block_group_cache, |
| 85 | cache_node); |
| 86 | if (block_group->key.objectid < cache->key.objectid) { |
| 87 | p = &(*p)->rb_left; |
| 88 | } else if (block_group->key.objectid > cache->key.objectid) { |
| 89 | p = &(*p)->rb_right; |
| 90 | } else { |
| 91 | spin_unlock(&info->block_group_cache_lock); |
| 92 | return -EEXIST; |
| 93 | } |
| 94 | } |
| 95 | |
| 96 | rb_link_node(&block_group->cache_node, parent, p); |
| 97 | rb_insert_color(&block_group->cache_node, |
| 98 | &info->block_group_cache_tree); |
| 99 | spin_unlock(&info->block_group_cache_lock); |
| 100 | |
| 101 | return 0; |
| 102 | } |
| 103 | |
| 104 | /* |
| 105 | * This will return the block group at or after bytenr if contains is 0, else |
| 106 | * it will return the block group that contains the bytenr |
| 107 | */ |
| 108 | static struct btrfs_block_group_cache * |
| 109 | block_group_cache_tree_search(struct btrfs_fs_info *info, u64 bytenr, |
| 110 | int contains) |
| 111 | { |
| 112 | struct btrfs_block_group_cache *cache, *ret = NULL; |
| 113 | struct rb_node *n; |
| 114 | u64 end, start; |
| 115 | |
| 116 | spin_lock(&info->block_group_cache_lock); |
| 117 | n = info->block_group_cache_tree.rb_node; |
| 118 | |
| 119 | while (n) { |
| 120 | cache = rb_entry(n, struct btrfs_block_group_cache, |
| 121 | cache_node); |
| 122 | end = cache->key.objectid + cache->key.offset - 1; |
| 123 | start = cache->key.objectid; |
| 124 | |
| 125 | if (bytenr < start) { |
| 126 | if (!contains && (!ret || start < ret->key.objectid)) |
| 127 | ret = cache; |
| 128 | n = n->rb_left; |
| 129 | } else if (bytenr > start) { |
| 130 | if (contains && bytenr <= end) { |
| 131 | ret = cache; |
| 132 | break; |
| 133 | } |
| 134 | n = n->rb_right; |
| 135 | } else { |
| 136 | ret = cache; |
| 137 | break; |
| 138 | } |
| 139 | } |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 140 | if (ret) |
| 141 | atomic_inc(&ret->count); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 142 | spin_unlock(&info->block_group_cache_lock); |
| 143 | |
| 144 | return ret; |
| 145 | } |
| 146 | |
| 147 | /* |
| 148 | * this is only called by cache_block_group, since we could have freed extents |
| 149 | * we need to check the pinned_extents for any extents that can't be used yet |
| 150 | * since their free space will be released as soon as the transaction commits. |
| 151 | */ |
| 152 | static int add_new_free_space(struct btrfs_block_group_cache *block_group, |
| 153 | struct btrfs_fs_info *info, u64 start, u64 end) |
| 154 | { |
| 155 | u64 extent_start, extent_end, size; |
| 156 | int ret; |
| 157 | |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 158 | mutex_lock(&info->pinned_mutex); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 159 | while (start < end) { |
| 160 | ret = find_first_extent_bit(&info->pinned_extents, start, |
| 161 | &extent_start, &extent_end, |
| 162 | EXTENT_DIRTY); |
| 163 | if (ret) |
| 164 | break; |
| 165 | |
| 166 | if (extent_start == start) { |
| 167 | start = extent_end + 1; |
| 168 | } else if (extent_start > start && extent_start < end) { |
| 169 | size = extent_start - start; |
Josef Bacik | ea6a478 | 2008-11-20 12:16:16 -0500 | [diff] [blame] | 170 | ret = btrfs_add_free_space(block_group, start, |
| 171 | size); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 172 | BUG_ON(ret); |
| 173 | start = extent_end + 1; |
| 174 | } else { |
| 175 | break; |
| 176 | } |
| 177 | } |
| 178 | |
| 179 | if (start < end) { |
| 180 | size = end - start; |
Josef Bacik | ea6a478 | 2008-11-20 12:16:16 -0500 | [diff] [blame] | 181 | ret = btrfs_add_free_space(block_group, start, size); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 182 | BUG_ON(ret); |
| 183 | } |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 184 | mutex_unlock(&info->pinned_mutex); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 185 | |
| 186 | return 0; |
| 187 | } |
| 188 | |
Yan Zheng | a512bbf | 2008-12-08 16:46:26 -0500 | [diff] [blame] | 189 | static int remove_sb_from_cache(struct btrfs_root *root, |
| 190 | struct btrfs_block_group_cache *cache) |
| 191 | { |
| 192 | u64 bytenr; |
| 193 | u64 *logical; |
| 194 | int stripe_len; |
| 195 | int i, nr, ret; |
| 196 | |
| 197 | for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) { |
| 198 | bytenr = btrfs_sb_offset(i); |
| 199 | ret = btrfs_rmap_block(&root->fs_info->mapping_tree, |
| 200 | cache->key.objectid, bytenr, 0, |
| 201 | &logical, &nr, &stripe_len); |
| 202 | BUG_ON(ret); |
| 203 | while (nr--) { |
| 204 | btrfs_remove_free_space(cache, logical[nr], |
| 205 | stripe_len); |
| 206 | } |
| 207 | kfree(logical); |
| 208 | } |
| 209 | return 0; |
| 210 | } |
| 211 | |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 212 | static int cache_block_group(struct btrfs_root *root, |
| 213 | struct btrfs_block_group_cache *block_group) |
| 214 | { |
| 215 | struct btrfs_path *path; |
Josef Bacik | ef8bbdf | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 216 | int ret = 0; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 217 | struct btrfs_key key; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 218 | struct extent_buffer *leaf; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 219 | int slot; |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 220 | u64 last; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 221 | |
Chris Mason | 00f5c79 | 2007-11-30 10:09:33 -0500 | [diff] [blame] | 222 | if (!block_group) |
| 223 | return 0; |
| 224 | |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 225 | root = root->fs_info->extent_root; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 226 | |
| 227 | if (block_group->cached) |
| 228 | return 0; |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 229 | |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 230 | path = btrfs_alloc_path(); |
| 231 | if (!path) |
| 232 | return -ENOMEM; |
Yan | 7d7d606 | 2007-09-14 16:15:28 -0400 | [diff] [blame] | 233 | |
Chris Mason | 2cc58cf | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 234 | path->reada = 2; |
Chris Mason | 5cd57b2 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 235 | /* |
| 236 | * we get into deadlocks with paths held by callers of this function. |
| 237 | * since the alloc_mutex is protecting things right now, just |
| 238 | * skip the locking here |
| 239 | */ |
| 240 | path->skip_locking = 1; |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 241 | last = max_t(u64, block_group->key.objectid, BTRFS_SUPER_INFO_OFFSET); |
| 242 | key.objectid = last; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 243 | key.offset = 0; |
| 244 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
| 245 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 246 | if (ret < 0) |
Josef Bacik | ef8bbdf | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 247 | goto err; |
Yan Zheng | a512bbf | 2008-12-08 16:46:26 -0500 | [diff] [blame] | 248 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 249 | while (1) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 250 | leaf = path->nodes[0]; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 251 | slot = path->slots[0]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 252 | if (slot >= btrfs_header_nritems(leaf)) { |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 253 | ret = btrfs_next_leaf(root, path); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 254 | if (ret < 0) |
| 255 | goto err; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 256 | if (ret == 0) |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 257 | continue; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 258 | else |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 259 | break; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 260 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 261 | btrfs_item_key_to_cpu(leaf, &key, slot); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 262 | if (key.objectid < block_group->key.objectid) |
Yan | 7d7d606 | 2007-09-14 16:15:28 -0400 | [diff] [blame] | 263 | goto next; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 264 | |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 265 | if (key.objectid >= block_group->key.objectid + |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 266 | block_group->key.offset) |
Yan | 7d7d606 | 2007-09-14 16:15:28 -0400 | [diff] [blame] | 267 | break; |
Yan | 7d7d606 | 2007-09-14 16:15:28 -0400 | [diff] [blame] | 268 | |
| 269 | if (btrfs_key_type(&key) == BTRFS_EXTENT_ITEM_KEY) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 270 | add_new_free_space(block_group, root->fs_info, last, |
| 271 | key.objectid); |
| 272 | |
Yan | 7d7d606 | 2007-09-14 16:15:28 -0400 | [diff] [blame] | 273 | last = key.objectid + key.offset; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 274 | } |
Yan | 7d7d606 | 2007-09-14 16:15:28 -0400 | [diff] [blame] | 275 | next: |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 276 | path->slots[0]++; |
| 277 | } |
| 278 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 279 | add_new_free_space(block_group, root->fs_info, last, |
| 280 | block_group->key.objectid + |
| 281 | block_group->key.offset); |
| 282 | |
Yan Zheng | a512bbf | 2008-12-08 16:46:26 -0500 | [diff] [blame] | 283 | remove_sb_from_cache(root, block_group); |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 284 | block_group->cached = 1; |
Josef Bacik | ef8bbdf | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 285 | ret = 0; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 286 | err: |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 287 | btrfs_free_path(path); |
Josef Bacik | ef8bbdf | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 288 | return ret; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 289 | } |
| 290 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 291 | /* |
| 292 | * return the block group that starts at or after bytenr |
| 293 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 294 | static struct btrfs_block_group_cache * |
| 295 | btrfs_lookup_first_block_group(struct btrfs_fs_info *info, u64 bytenr) |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 296 | { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 297 | struct btrfs_block_group_cache *cache; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 298 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 299 | cache = block_group_cache_tree_search(info, bytenr, 0); |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 300 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 301 | return cache; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 302 | } |
| 303 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 304 | /* |
| 305 | * return the block group that contains teh given bytenr |
| 306 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 307 | struct btrfs_block_group_cache *btrfs_lookup_block_group( |
| 308 | struct btrfs_fs_info *info, |
| 309 | u64 bytenr) |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 310 | { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 311 | struct btrfs_block_group_cache *cache; |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 312 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 313 | cache = block_group_cache_tree_search(info, bytenr, 1); |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 314 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 315 | return cache; |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 316 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 317 | |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 318 | static inline void put_block_group(struct btrfs_block_group_cache *cache) |
| 319 | { |
| 320 | if (atomic_dec_and_test(&cache->count)) |
| 321 | kfree(cache); |
| 322 | } |
| 323 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 324 | static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info, |
| 325 | u64 flags) |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 326 | { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 327 | struct list_head *head = &info->space_info; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 328 | struct btrfs_space_info *found; |
Qinghuang Feng | c6e3087 | 2009-01-21 10:59:08 -0500 | [diff] [blame] | 329 | list_for_each_entry(found, head, list) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 330 | if (found->flags == flags) |
| 331 | return found; |
| 332 | } |
| 333 | return NULL; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 334 | } |
| 335 | |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 336 | static u64 div_factor(u64 num, int factor) |
| 337 | { |
| 338 | if (factor == 10) |
| 339 | return num; |
| 340 | num *= factor; |
| 341 | do_div(num, 10); |
| 342 | return num; |
| 343 | } |
| 344 | |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 345 | u64 btrfs_find_block_group(struct btrfs_root *root, |
| 346 | u64 search_start, u64 search_hint, int owner) |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 347 | { |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 348 | struct btrfs_block_group_cache *cache; |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 349 | u64 used; |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 350 | u64 last = max(search_hint, search_start); |
| 351 | u64 group_start = 0; |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 352 | int full_search = 0; |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 353 | int factor = 9; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 354 | int wrapped = 0; |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 355 | again: |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 356 | while (1) { |
| 357 | cache = btrfs_lookup_first_block_group(root->fs_info, last); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 358 | if (!cache) |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 359 | break; |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 360 | |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 361 | spin_lock(&cache->lock); |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 362 | last = cache->key.objectid + cache->key.offset; |
| 363 | used = btrfs_block_group_used(&cache->item); |
| 364 | |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 365 | if ((full_search || !cache->ro) && |
| 366 | block_group_bits(cache, BTRFS_BLOCK_GROUP_METADATA)) { |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 367 | if (used + cache->pinned + cache->reserved < |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 368 | div_factor(cache->key.offset, factor)) { |
| 369 | group_start = cache->key.objectid; |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 370 | spin_unlock(&cache->lock); |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 371 | put_block_group(cache); |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 372 | goto found; |
| 373 | } |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 374 | } |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 375 | spin_unlock(&cache->lock); |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 376 | put_block_group(cache); |
Chris Mason | de428b6 | 2007-05-18 13:28:27 -0400 | [diff] [blame] | 377 | cond_resched(); |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 378 | } |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 379 | if (!wrapped) { |
| 380 | last = search_start; |
| 381 | wrapped = 1; |
| 382 | goto again; |
| 383 | } |
| 384 | if (!full_search && factor < 10) { |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 385 | last = search_start; |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 386 | full_search = 1; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 387 | factor = 10; |
Chris Mason | 31f3c99 | 2007-04-30 15:25:45 -0400 | [diff] [blame] | 388 | goto again; |
| 389 | } |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 390 | found: |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 391 | return group_start; |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 392 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 393 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 394 | /* simple helper to search for an existing extent at a given offset */ |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 395 | int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 396 | { |
| 397 | int ret; |
| 398 | struct btrfs_key key; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 399 | struct btrfs_path *path; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 400 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 401 | path = btrfs_alloc_path(); |
| 402 | BUG_ON(!path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 403 | key.objectid = start; |
| 404 | key.offset = len; |
| 405 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
| 406 | ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, path, |
| 407 | 0, 0); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 408 | btrfs_free_path(path); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 409 | return ret; |
| 410 | } |
| 411 | |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 412 | /* |
| 413 | * Back reference rules. Back refs have three main goals: |
| 414 | * |
| 415 | * 1) differentiate between all holders of references to an extent so that |
| 416 | * when a reference is dropped we can make sure it was a valid reference |
| 417 | * before freeing the extent. |
| 418 | * |
| 419 | * 2) Provide enough information to quickly find the holders of an extent |
| 420 | * if we notice a given block is corrupted or bad. |
| 421 | * |
| 422 | * 3) Make it easy to migrate blocks for FS shrinking or storage pool |
| 423 | * maintenance. This is actually the same as #2, but with a slightly |
| 424 | * different use case. |
| 425 | * |
| 426 | * File extents can be referenced by: |
| 427 | * |
| 428 | * - multiple snapshots, subvolumes, or different generations in one subvol |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 429 | * - different files inside a single subvolume |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 430 | * - different offsets inside a file (bookend extents in file.c) |
| 431 | * |
| 432 | * The extent ref structure has fields for: |
| 433 | * |
| 434 | * - Objectid of the subvolume root |
| 435 | * - Generation number of the tree holding the reference |
| 436 | * - objectid of the file holding the reference |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 437 | * - number of references holding by parent node (alway 1 for tree blocks) |
| 438 | * |
| 439 | * Btree leaf may hold multiple references to a file extent. In most cases, |
| 440 | * these references are from same file and the corresponding offsets inside |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 441 | * the file are close together. |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 442 | * |
| 443 | * When a file extent is allocated the fields are filled in: |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 444 | * (root_key.objectid, trans->transid, inode objectid, 1) |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 445 | * |
| 446 | * When a leaf is cow'd new references are added for every file extent found |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 447 | * in the leaf. It looks similar to the create case, but trans->transid will |
| 448 | * be different when the block is cow'd. |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 449 | * |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 450 | * (root_key.objectid, trans->transid, inode objectid, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 451 | * number of references in the leaf) |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 452 | * |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 453 | * When a file extent is removed either during snapshot deletion or |
| 454 | * file truncation, we find the corresponding back reference and check |
| 455 | * the following fields: |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 456 | * |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 457 | * (btrfs_header_owner(leaf), btrfs_header_generation(leaf), |
| 458 | * inode objectid) |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 459 | * |
| 460 | * Btree extents can be referenced by: |
| 461 | * |
| 462 | * - Different subvolumes |
| 463 | * - Different generations of the same subvolume |
| 464 | * |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 465 | * When a tree block is created, back references are inserted: |
| 466 | * |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 467 | * (root->root_key.objectid, trans->transid, level, 1) |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 468 | * |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 469 | * When a tree block is cow'd, new back references are added for all the |
| 470 | * blocks it points to. If the tree block isn't in reference counted root, |
| 471 | * the old back references are removed. These new back references are of |
| 472 | * the form (trans->transid will have increased since creation): |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 473 | * |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 474 | * (root->root_key.objectid, trans->transid, level, 1) |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 475 | * |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 476 | * When a backref is in deleting, the following fields are checked: |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 477 | * |
| 478 | * if backref was for a tree root: |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 479 | * (btrfs_header_owner(itself), btrfs_header_generation(itself), level) |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 480 | * else |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 481 | * (btrfs_header_owner(parent), btrfs_header_generation(parent), level) |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 482 | * |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 483 | * Back Reference Key composing: |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 484 | * |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 485 | * The key objectid corresponds to the first byte in the extent, the key |
| 486 | * type is set to BTRFS_EXTENT_REF_KEY, and the key offset is the first |
| 487 | * byte of parent extent. If a extent is tree root, the key offset is set |
| 488 | * to the key objectid. |
Chris Mason | d8d5f3e | 2007-12-11 12:42:00 -0500 | [diff] [blame] | 489 | */ |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 490 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 491 | static noinline int lookup_extent_backref(struct btrfs_trans_handle *trans, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 492 | struct btrfs_root *root, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 493 | struct btrfs_path *path, |
| 494 | u64 bytenr, u64 parent, |
| 495 | u64 ref_root, u64 ref_generation, |
| 496 | u64 owner_objectid, int del) |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 497 | { |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 498 | struct btrfs_key key; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 499 | struct btrfs_extent_ref *ref; |
| 500 | struct extent_buffer *leaf; |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 501 | u64 ref_objectid; |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 502 | int ret; |
| 503 | |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 504 | key.objectid = bytenr; |
| 505 | key.type = BTRFS_EXTENT_REF_KEY; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 506 | key.offset = parent; |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 507 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 508 | ret = btrfs_search_slot(trans, root, &key, path, del ? -1 : 0, 1); |
| 509 | if (ret < 0) |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 510 | goto out; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 511 | if (ret > 0) { |
| 512 | ret = -ENOENT; |
| 513 | goto out; |
| 514 | } |
| 515 | |
| 516 | leaf = path->nodes[0]; |
| 517 | ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref); |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 518 | ref_objectid = btrfs_ref_objectid(leaf, ref); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 519 | if (btrfs_ref_root(leaf, ref) != ref_root || |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 520 | btrfs_ref_generation(leaf, ref) != ref_generation || |
| 521 | (ref_objectid != owner_objectid && |
| 522 | ref_objectid != BTRFS_MULTIPLE_OBJECTIDS)) { |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 523 | ret = -EIO; |
| 524 | WARN_ON(1); |
| 525 | goto out; |
| 526 | } |
| 527 | ret = 0; |
| 528 | out: |
| 529 | return ret; |
| 530 | } |
| 531 | |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 532 | /* |
| 533 | * updates all the backrefs that are pending on update_list for the |
| 534 | * extent_root |
| 535 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 536 | static noinline int update_backrefs(struct btrfs_trans_handle *trans, |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 537 | struct btrfs_root *extent_root, |
| 538 | struct btrfs_path *path, |
| 539 | struct list_head *update_list) |
| 540 | { |
| 541 | struct btrfs_key key; |
| 542 | struct btrfs_extent_ref *ref; |
| 543 | struct btrfs_fs_info *info = extent_root->fs_info; |
| 544 | struct pending_extent_op *op; |
| 545 | struct extent_buffer *leaf; |
| 546 | int ret = 0; |
| 547 | struct list_head *cur = update_list->next; |
| 548 | u64 ref_objectid; |
| 549 | u64 ref_root = extent_root->root_key.objectid; |
| 550 | |
| 551 | op = list_entry(cur, struct pending_extent_op, list); |
| 552 | |
| 553 | search: |
| 554 | key.objectid = op->bytenr; |
| 555 | key.type = BTRFS_EXTENT_REF_KEY; |
| 556 | key.offset = op->orig_parent; |
| 557 | |
| 558 | ret = btrfs_search_slot(trans, extent_root, &key, path, 0, 1); |
| 559 | BUG_ON(ret); |
| 560 | |
| 561 | leaf = path->nodes[0]; |
| 562 | |
| 563 | loop: |
| 564 | ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref); |
| 565 | |
| 566 | ref_objectid = btrfs_ref_objectid(leaf, ref); |
| 567 | |
| 568 | if (btrfs_ref_root(leaf, ref) != ref_root || |
| 569 | btrfs_ref_generation(leaf, ref) != op->orig_generation || |
| 570 | (ref_objectid != op->level && |
| 571 | ref_objectid != BTRFS_MULTIPLE_OBJECTIDS)) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 572 | printk(KERN_ERR "btrfs couldn't find %llu, parent %llu, " |
| 573 | "root %llu, owner %u\n", |
| 574 | (unsigned long long)op->bytenr, |
| 575 | (unsigned long long)op->orig_parent, |
| 576 | (unsigned long long)ref_root, op->level); |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 577 | btrfs_print_leaf(extent_root, leaf); |
| 578 | BUG(); |
| 579 | } |
| 580 | |
| 581 | key.objectid = op->bytenr; |
| 582 | key.offset = op->parent; |
| 583 | key.type = BTRFS_EXTENT_REF_KEY; |
| 584 | ret = btrfs_set_item_key_safe(trans, extent_root, path, &key); |
| 585 | BUG_ON(ret); |
| 586 | ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref); |
| 587 | btrfs_set_ref_generation(leaf, ref, op->generation); |
| 588 | |
| 589 | cur = cur->next; |
| 590 | |
| 591 | list_del_init(&op->list); |
| 592 | unlock_extent(&info->extent_ins, op->bytenr, |
| 593 | op->bytenr + op->num_bytes - 1, GFP_NOFS); |
| 594 | kfree(op); |
| 595 | |
| 596 | if (cur == update_list) { |
| 597 | btrfs_mark_buffer_dirty(path->nodes[0]); |
| 598 | btrfs_release_path(extent_root, path); |
| 599 | goto out; |
| 600 | } |
| 601 | |
| 602 | op = list_entry(cur, struct pending_extent_op, list); |
| 603 | |
| 604 | path->slots[0]++; |
| 605 | while (path->slots[0] < btrfs_header_nritems(leaf)) { |
| 606 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| 607 | if (key.objectid == op->bytenr && |
| 608 | key.type == BTRFS_EXTENT_REF_KEY) |
| 609 | goto loop; |
| 610 | path->slots[0]++; |
| 611 | } |
| 612 | |
| 613 | btrfs_mark_buffer_dirty(path->nodes[0]); |
| 614 | btrfs_release_path(extent_root, path); |
| 615 | goto search; |
| 616 | |
| 617 | out: |
| 618 | return 0; |
| 619 | } |
| 620 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 621 | static noinline int insert_extents(struct btrfs_trans_handle *trans, |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 622 | struct btrfs_root *extent_root, |
| 623 | struct btrfs_path *path, |
| 624 | struct list_head *insert_list, int nr) |
| 625 | { |
| 626 | struct btrfs_key *keys; |
| 627 | u32 *data_size; |
| 628 | struct pending_extent_op *op; |
| 629 | struct extent_buffer *leaf; |
| 630 | struct list_head *cur = insert_list->next; |
| 631 | struct btrfs_fs_info *info = extent_root->fs_info; |
| 632 | u64 ref_root = extent_root->root_key.objectid; |
| 633 | int i = 0, last = 0, ret; |
| 634 | int total = nr * 2; |
| 635 | |
| 636 | if (!nr) |
| 637 | return 0; |
| 638 | |
| 639 | keys = kzalloc(total * sizeof(struct btrfs_key), GFP_NOFS); |
| 640 | if (!keys) |
| 641 | return -ENOMEM; |
| 642 | |
| 643 | data_size = kzalloc(total * sizeof(u32), GFP_NOFS); |
| 644 | if (!data_size) { |
| 645 | kfree(keys); |
| 646 | return -ENOMEM; |
| 647 | } |
| 648 | |
| 649 | list_for_each_entry(op, insert_list, list) { |
| 650 | keys[i].objectid = op->bytenr; |
| 651 | keys[i].offset = op->num_bytes; |
| 652 | keys[i].type = BTRFS_EXTENT_ITEM_KEY; |
| 653 | data_size[i] = sizeof(struct btrfs_extent_item); |
| 654 | i++; |
| 655 | |
| 656 | keys[i].objectid = op->bytenr; |
| 657 | keys[i].offset = op->parent; |
| 658 | keys[i].type = BTRFS_EXTENT_REF_KEY; |
| 659 | data_size[i] = sizeof(struct btrfs_extent_ref); |
| 660 | i++; |
| 661 | } |
| 662 | |
| 663 | op = list_entry(cur, struct pending_extent_op, list); |
| 664 | i = 0; |
| 665 | while (i < total) { |
| 666 | int c; |
| 667 | ret = btrfs_insert_some_items(trans, extent_root, path, |
| 668 | keys+i, data_size+i, total-i); |
| 669 | BUG_ON(ret < 0); |
| 670 | |
| 671 | if (last && ret > 1) |
| 672 | BUG(); |
| 673 | |
| 674 | leaf = path->nodes[0]; |
| 675 | for (c = 0; c < ret; c++) { |
| 676 | int ref_first = keys[i].type == BTRFS_EXTENT_REF_KEY; |
| 677 | |
| 678 | /* |
| 679 | * if the first item we inserted was a backref, then |
| 680 | * the EXTENT_ITEM will be the odd c's, else it will |
| 681 | * be the even c's |
| 682 | */ |
| 683 | if ((ref_first && (c % 2)) || |
| 684 | (!ref_first && !(c % 2))) { |
| 685 | struct btrfs_extent_item *itm; |
| 686 | |
| 687 | itm = btrfs_item_ptr(leaf, path->slots[0] + c, |
| 688 | struct btrfs_extent_item); |
| 689 | btrfs_set_extent_refs(path->nodes[0], itm, 1); |
| 690 | op->del++; |
| 691 | } else { |
| 692 | struct btrfs_extent_ref *ref; |
| 693 | |
| 694 | ref = btrfs_item_ptr(leaf, path->slots[0] + c, |
| 695 | struct btrfs_extent_ref); |
| 696 | btrfs_set_ref_root(leaf, ref, ref_root); |
| 697 | btrfs_set_ref_generation(leaf, ref, |
| 698 | op->generation); |
| 699 | btrfs_set_ref_objectid(leaf, ref, op->level); |
| 700 | btrfs_set_ref_num_refs(leaf, ref, 1); |
| 701 | op->del++; |
| 702 | } |
| 703 | |
| 704 | /* |
| 705 | * using del to see when its ok to free up the |
| 706 | * pending_extent_op. In the case where we insert the |
| 707 | * last item on the list in order to help do batching |
| 708 | * we need to not free the extent op until we actually |
| 709 | * insert the extent_item |
| 710 | */ |
| 711 | if (op->del == 2) { |
| 712 | unlock_extent(&info->extent_ins, op->bytenr, |
| 713 | op->bytenr + op->num_bytes - 1, |
| 714 | GFP_NOFS); |
| 715 | cur = cur->next; |
| 716 | list_del_init(&op->list); |
| 717 | kfree(op); |
| 718 | if (cur != insert_list) |
| 719 | op = list_entry(cur, |
| 720 | struct pending_extent_op, |
| 721 | list); |
| 722 | } |
| 723 | } |
| 724 | btrfs_mark_buffer_dirty(leaf); |
| 725 | btrfs_release_path(extent_root, path); |
| 726 | |
| 727 | /* |
| 728 | * Ok backref's and items usually go right next to eachother, |
| 729 | * but if we could only insert 1 item that means that we |
| 730 | * inserted on the end of a leaf, and we have no idea what may |
| 731 | * be on the next leaf so we just play it safe. In order to |
| 732 | * try and help this case we insert the last thing on our |
| 733 | * insert list so hopefully it will end up being the last |
| 734 | * thing on the leaf and everything else will be before it, |
| 735 | * which will let us insert a whole bunch of items at the same |
| 736 | * time. |
| 737 | */ |
| 738 | if (ret == 1 && !last && (i + ret < total)) { |
| 739 | /* |
| 740 | * last: where we will pick up the next time around |
| 741 | * i: our current key to insert, will be total - 1 |
| 742 | * cur: the current op we are screwing with |
| 743 | * op: duh |
| 744 | */ |
| 745 | last = i + ret; |
| 746 | i = total - 1; |
| 747 | cur = insert_list->prev; |
| 748 | op = list_entry(cur, struct pending_extent_op, list); |
| 749 | } else if (last) { |
| 750 | /* |
| 751 | * ok we successfully inserted the last item on the |
| 752 | * list, lets reset everything |
| 753 | * |
| 754 | * i: our current key to insert, so where we left off |
| 755 | * last time |
| 756 | * last: done with this |
| 757 | * cur: the op we are messing with |
| 758 | * op: duh |
| 759 | * total: since we inserted the last key, we need to |
| 760 | * decrement total so we dont overflow |
| 761 | */ |
| 762 | i = last; |
| 763 | last = 0; |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 764 | total--; |
Liu Hui | b4eec2c | 2008-11-18 11:30:10 -0500 | [diff] [blame] | 765 | if (i < total) { |
| 766 | cur = insert_list->next; |
| 767 | op = list_entry(cur, struct pending_extent_op, |
| 768 | list); |
| 769 | } |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 770 | } else { |
| 771 | i += ret; |
| 772 | } |
| 773 | |
| 774 | cond_resched(); |
| 775 | } |
| 776 | ret = 0; |
| 777 | kfree(keys); |
| 778 | kfree(data_size); |
| 779 | return ret; |
| 780 | } |
| 781 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 782 | static noinline int insert_extent_backref(struct btrfs_trans_handle *trans, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 783 | struct btrfs_root *root, |
| 784 | struct btrfs_path *path, |
| 785 | u64 bytenr, u64 parent, |
| 786 | u64 ref_root, u64 ref_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 787 | u64 owner_objectid) |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 788 | { |
| 789 | struct btrfs_key key; |
| 790 | struct extent_buffer *leaf; |
| 791 | struct btrfs_extent_ref *ref; |
| 792 | u32 num_refs; |
| 793 | int ret; |
| 794 | |
| 795 | key.objectid = bytenr; |
| 796 | key.type = BTRFS_EXTENT_REF_KEY; |
| 797 | key.offset = parent; |
| 798 | |
| 799 | ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(*ref)); |
| 800 | if (ret == 0) { |
| 801 | leaf = path->nodes[0]; |
| 802 | ref = btrfs_item_ptr(leaf, path->slots[0], |
| 803 | struct btrfs_extent_ref); |
| 804 | btrfs_set_ref_root(leaf, ref, ref_root); |
| 805 | btrfs_set_ref_generation(leaf, ref, ref_generation); |
| 806 | btrfs_set_ref_objectid(leaf, ref, owner_objectid); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 807 | btrfs_set_ref_num_refs(leaf, ref, 1); |
| 808 | } else if (ret == -EEXIST) { |
| 809 | u64 existing_owner; |
| 810 | BUG_ON(owner_objectid < BTRFS_FIRST_FREE_OBJECTID); |
| 811 | leaf = path->nodes[0]; |
| 812 | ref = btrfs_item_ptr(leaf, path->slots[0], |
| 813 | struct btrfs_extent_ref); |
| 814 | if (btrfs_ref_root(leaf, ref) != ref_root || |
| 815 | btrfs_ref_generation(leaf, ref) != ref_generation) { |
| 816 | ret = -EIO; |
| 817 | WARN_ON(1); |
| 818 | goto out; |
| 819 | } |
| 820 | |
| 821 | num_refs = btrfs_ref_num_refs(leaf, ref); |
| 822 | BUG_ON(num_refs == 0); |
| 823 | btrfs_set_ref_num_refs(leaf, ref, num_refs + 1); |
| 824 | |
| 825 | existing_owner = btrfs_ref_objectid(leaf, ref); |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 826 | if (existing_owner != owner_objectid && |
| 827 | existing_owner != BTRFS_MULTIPLE_OBJECTIDS) { |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 828 | btrfs_set_ref_objectid(leaf, ref, |
| 829 | BTRFS_MULTIPLE_OBJECTIDS); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 830 | } |
| 831 | ret = 0; |
| 832 | } else { |
| 833 | goto out; |
| 834 | } |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 835 | btrfs_mark_buffer_dirty(path->nodes[0]); |
| 836 | out: |
| 837 | btrfs_release_path(root, path); |
| 838 | return ret; |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 839 | } |
| 840 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 841 | static noinline int remove_extent_backref(struct btrfs_trans_handle *trans, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 842 | struct btrfs_root *root, |
| 843 | struct btrfs_path *path) |
| 844 | { |
| 845 | struct extent_buffer *leaf; |
| 846 | struct btrfs_extent_ref *ref; |
| 847 | u32 num_refs; |
| 848 | int ret = 0; |
| 849 | |
| 850 | leaf = path->nodes[0]; |
| 851 | ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_ref); |
| 852 | num_refs = btrfs_ref_num_refs(leaf, ref); |
| 853 | BUG_ON(num_refs == 0); |
| 854 | num_refs -= 1; |
| 855 | if (num_refs == 0) { |
| 856 | ret = btrfs_del_item(trans, root, path); |
| 857 | } else { |
| 858 | btrfs_set_ref_num_refs(leaf, ref, num_refs); |
| 859 | btrfs_mark_buffer_dirty(leaf); |
| 860 | } |
| 861 | btrfs_release_path(root, path); |
| 862 | return ret; |
| 863 | } |
| 864 | |
Chris Mason | 4b4e25f | 2008-11-20 10:22:27 -0500 | [diff] [blame] | 865 | #ifdef BIO_RW_DISCARD |
Chris Mason | 15916de | 2008-11-19 21:17:22 -0500 | [diff] [blame] | 866 | static void btrfs_issue_discard(struct block_device *bdev, |
| 867 | u64 start, u64 len) |
| 868 | { |
Chris Mason | 15916de | 2008-11-19 21:17:22 -0500 | [diff] [blame] | 869 | blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL); |
Chris Mason | 15916de | 2008-11-19 21:17:22 -0500 | [diff] [blame] | 870 | } |
Chris Mason | 4b4e25f | 2008-11-20 10:22:27 -0500 | [diff] [blame] | 871 | #endif |
Chris Mason | 15916de | 2008-11-19 21:17:22 -0500 | [diff] [blame] | 872 | |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 873 | static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr, |
| 874 | u64 num_bytes) |
| 875 | { |
| 876 | #ifdef BIO_RW_DISCARD |
| 877 | int ret; |
| 878 | u64 map_length = num_bytes; |
| 879 | struct btrfs_multi_bio *multi = NULL; |
| 880 | |
| 881 | /* Tell the block device(s) that the sectors can be discarded */ |
| 882 | ret = btrfs_map_block(&root->fs_info->mapping_tree, READ, |
| 883 | bytenr, &map_length, &multi, 0); |
| 884 | if (!ret) { |
| 885 | struct btrfs_bio_stripe *stripe = multi->stripes; |
| 886 | int i; |
| 887 | |
| 888 | if (map_length > num_bytes) |
| 889 | map_length = num_bytes; |
| 890 | |
| 891 | for (i = 0; i < multi->num_stripes; i++, stripe++) { |
| 892 | btrfs_issue_discard(stripe->dev->bdev, |
| 893 | stripe->physical, |
| 894 | map_length); |
| 895 | } |
| 896 | kfree(multi); |
| 897 | } |
| 898 | |
| 899 | return ret; |
| 900 | #else |
| 901 | return 0; |
| 902 | #endif |
| 903 | } |
| 904 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 905 | static noinline int free_extents(struct btrfs_trans_handle *trans, |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 906 | struct btrfs_root *extent_root, |
| 907 | struct list_head *del_list) |
| 908 | { |
| 909 | struct btrfs_fs_info *info = extent_root->fs_info; |
| 910 | struct btrfs_path *path; |
| 911 | struct btrfs_key key, found_key; |
| 912 | struct extent_buffer *leaf; |
| 913 | struct list_head *cur; |
| 914 | struct pending_extent_op *op; |
| 915 | struct btrfs_extent_item *ei; |
| 916 | int ret, num_to_del, extent_slot = 0, found_extent = 0; |
| 917 | u32 refs; |
| 918 | u64 bytes_freed = 0; |
| 919 | |
| 920 | path = btrfs_alloc_path(); |
| 921 | if (!path) |
| 922 | return -ENOMEM; |
| 923 | path->reada = 1; |
| 924 | |
| 925 | search: |
| 926 | /* search for the backref for the current ref we want to delete */ |
| 927 | cur = del_list->next; |
| 928 | op = list_entry(cur, struct pending_extent_op, list); |
| 929 | ret = lookup_extent_backref(trans, extent_root, path, op->bytenr, |
| 930 | op->orig_parent, |
| 931 | extent_root->root_key.objectid, |
| 932 | op->orig_generation, op->level, 1); |
| 933 | if (ret) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 934 | printk(KERN_ERR "btrfs unable to find backref byte nr %llu " |
| 935 | "root %llu gen %llu owner %u\n", |
| 936 | (unsigned long long)op->bytenr, |
| 937 | (unsigned long long)extent_root->root_key.objectid, |
| 938 | (unsigned long long)op->orig_generation, op->level); |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 939 | btrfs_print_leaf(extent_root, path->nodes[0]); |
| 940 | WARN_ON(1); |
| 941 | goto out; |
| 942 | } |
| 943 | |
| 944 | extent_slot = path->slots[0]; |
| 945 | num_to_del = 1; |
| 946 | found_extent = 0; |
| 947 | |
| 948 | /* |
| 949 | * if we aren't the first item on the leaf we can move back one and see |
| 950 | * if our ref is right next to our extent item |
| 951 | */ |
| 952 | if (likely(extent_slot)) { |
| 953 | extent_slot--; |
| 954 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, |
| 955 | extent_slot); |
| 956 | if (found_key.objectid == op->bytenr && |
| 957 | found_key.type == BTRFS_EXTENT_ITEM_KEY && |
| 958 | found_key.offset == op->num_bytes) { |
| 959 | num_to_del++; |
| 960 | found_extent = 1; |
| 961 | } |
| 962 | } |
| 963 | |
| 964 | /* |
| 965 | * if we didn't find the extent we need to delete the backref and then |
| 966 | * search for the extent item key so we can update its ref count |
| 967 | */ |
| 968 | if (!found_extent) { |
| 969 | key.objectid = op->bytenr; |
| 970 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 971 | key.offset = op->num_bytes; |
| 972 | |
| 973 | ret = remove_extent_backref(trans, extent_root, path); |
| 974 | BUG_ON(ret); |
| 975 | btrfs_release_path(extent_root, path); |
| 976 | ret = btrfs_search_slot(trans, extent_root, &key, path, -1, 1); |
| 977 | BUG_ON(ret); |
| 978 | extent_slot = path->slots[0]; |
| 979 | } |
| 980 | |
| 981 | /* this is where we update the ref count for the extent */ |
| 982 | leaf = path->nodes[0]; |
| 983 | ei = btrfs_item_ptr(leaf, extent_slot, struct btrfs_extent_item); |
| 984 | refs = btrfs_extent_refs(leaf, ei); |
| 985 | BUG_ON(refs == 0); |
| 986 | refs--; |
| 987 | btrfs_set_extent_refs(leaf, ei, refs); |
| 988 | |
| 989 | btrfs_mark_buffer_dirty(leaf); |
| 990 | |
| 991 | /* |
| 992 | * This extent needs deleting. The reason cur_slot is extent_slot + |
| 993 | * num_to_del is because extent_slot points to the slot where the extent |
| 994 | * is, and if the backref was not right next to the extent we will be |
| 995 | * deleting at least 1 item, and will want to start searching at the |
| 996 | * slot directly next to extent_slot. However if we did find the |
| 997 | * backref next to the extent item them we will be deleting at least 2 |
| 998 | * items and will want to start searching directly after the ref slot |
| 999 | */ |
| 1000 | if (!refs) { |
| 1001 | struct list_head *pos, *n, *end; |
| 1002 | int cur_slot = extent_slot+num_to_del; |
| 1003 | u64 super_used; |
| 1004 | u64 root_used; |
| 1005 | |
| 1006 | path->slots[0] = extent_slot; |
| 1007 | bytes_freed = op->num_bytes; |
| 1008 | |
Josef Bacik | e3e469f | 2008-11-17 21:11:49 -0500 | [diff] [blame] | 1009 | mutex_lock(&info->pinned_mutex); |
| 1010 | ret = pin_down_bytes(trans, extent_root, op->bytenr, |
| 1011 | op->num_bytes, op->level >= |
| 1012 | BTRFS_FIRST_FREE_OBJECTID); |
| 1013 | mutex_unlock(&info->pinned_mutex); |
| 1014 | BUG_ON(ret < 0); |
| 1015 | op->del = ret; |
| 1016 | |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 1017 | /* |
| 1018 | * we need to see if we can delete multiple things at once, so |
| 1019 | * start looping through the list of extents we are wanting to |
| 1020 | * delete and see if their extent/backref's are right next to |
| 1021 | * eachother and the extents only have 1 ref |
| 1022 | */ |
| 1023 | for (pos = cur->next; pos != del_list; pos = pos->next) { |
| 1024 | struct pending_extent_op *tmp; |
| 1025 | |
| 1026 | tmp = list_entry(pos, struct pending_extent_op, list); |
| 1027 | |
| 1028 | /* we only want to delete extent+ref at this stage */ |
| 1029 | if (cur_slot >= btrfs_header_nritems(leaf) - 1) |
| 1030 | break; |
| 1031 | |
| 1032 | btrfs_item_key_to_cpu(leaf, &found_key, cur_slot); |
| 1033 | if (found_key.objectid != tmp->bytenr || |
| 1034 | found_key.type != BTRFS_EXTENT_ITEM_KEY || |
| 1035 | found_key.offset != tmp->num_bytes) |
| 1036 | break; |
| 1037 | |
| 1038 | /* check to make sure this extent only has one ref */ |
| 1039 | ei = btrfs_item_ptr(leaf, cur_slot, |
| 1040 | struct btrfs_extent_item); |
| 1041 | if (btrfs_extent_refs(leaf, ei) != 1) |
| 1042 | break; |
| 1043 | |
| 1044 | btrfs_item_key_to_cpu(leaf, &found_key, cur_slot+1); |
| 1045 | if (found_key.objectid != tmp->bytenr || |
| 1046 | found_key.type != BTRFS_EXTENT_REF_KEY || |
| 1047 | found_key.offset != tmp->orig_parent) |
| 1048 | break; |
| 1049 | |
| 1050 | /* |
| 1051 | * the ref is right next to the extent, we can set the |
| 1052 | * ref count to 0 since we will delete them both now |
| 1053 | */ |
| 1054 | btrfs_set_extent_refs(leaf, ei, 0); |
| 1055 | |
| 1056 | /* pin down the bytes for this extent */ |
| 1057 | mutex_lock(&info->pinned_mutex); |
| 1058 | ret = pin_down_bytes(trans, extent_root, tmp->bytenr, |
| 1059 | tmp->num_bytes, tmp->level >= |
| 1060 | BTRFS_FIRST_FREE_OBJECTID); |
| 1061 | mutex_unlock(&info->pinned_mutex); |
| 1062 | BUG_ON(ret < 0); |
| 1063 | |
| 1064 | /* |
| 1065 | * use the del field to tell if we need to go ahead and |
| 1066 | * free up the extent when we delete the item or not. |
| 1067 | */ |
| 1068 | tmp->del = ret; |
| 1069 | bytes_freed += tmp->num_bytes; |
| 1070 | |
| 1071 | num_to_del += 2; |
| 1072 | cur_slot += 2; |
| 1073 | } |
| 1074 | end = pos; |
| 1075 | |
| 1076 | /* update the free space counters */ |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 1077 | spin_lock(&info->delalloc_lock); |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 1078 | super_used = btrfs_super_bytes_used(&info->super_copy); |
| 1079 | btrfs_set_super_bytes_used(&info->super_copy, |
| 1080 | super_used - bytes_freed); |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 1081 | |
| 1082 | root_used = btrfs_root_used(&extent_root->root_item); |
| 1083 | btrfs_set_root_used(&extent_root->root_item, |
| 1084 | root_used - bytes_freed); |
Yan Zheng | 34bf63c | 2008-12-19 10:58:46 -0500 | [diff] [blame] | 1085 | spin_unlock(&info->delalloc_lock); |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 1086 | |
| 1087 | /* delete the items */ |
| 1088 | ret = btrfs_del_items(trans, extent_root, path, |
| 1089 | path->slots[0], num_to_del); |
| 1090 | BUG_ON(ret); |
| 1091 | |
| 1092 | /* |
| 1093 | * loop through the extents we deleted and do the cleanup work |
| 1094 | * on them |
| 1095 | */ |
| 1096 | for (pos = cur, n = pos->next; pos != end; |
| 1097 | pos = n, n = pos->next) { |
| 1098 | struct pending_extent_op *tmp; |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 1099 | tmp = list_entry(pos, struct pending_extent_op, list); |
| 1100 | |
| 1101 | /* |
| 1102 | * remember tmp->del tells us wether or not we pinned |
| 1103 | * down the extent |
| 1104 | */ |
| 1105 | ret = update_block_group(trans, extent_root, |
| 1106 | tmp->bytenr, tmp->num_bytes, 0, |
| 1107 | tmp->del); |
| 1108 | BUG_ON(ret); |
| 1109 | |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 1110 | list_del_init(&tmp->list); |
| 1111 | unlock_extent(&info->extent_ins, tmp->bytenr, |
| 1112 | tmp->bytenr + tmp->num_bytes - 1, |
| 1113 | GFP_NOFS); |
| 1114 | kfree(tmp); |
| 1115 | } |
| 1116 | } else if (refs && found_extent) { |
| 1117 | /* |
| 1118 | * the ref and extent were right next to eachother, but the |
| 1119 | * extent still has a ref, so just free the backref and keep |
| 1120 | * going |
| 1121 | */ |
| 1122 | ret = remove_extent_backref(trans, extent_root, path); |
| 1123 | BUG_ON(ret); |
| 1124 | |
| 1125 | list_del_init(&op->list); |
| 1126 | unlock_extent(&info->extent_ins, op->bytenr, |
| 1127 | op->bytenr + op->num_bytes - 1, GFP_NOFS); |
| 1128 | kfree(op); |
| 1129 | } else { |
| 1130 | /* |
| 1131 | * the extent has multiple refs and the backref we were looking |
| 1132 | * for was not right next to it, so just unlock and go next, |
| 1133 | * we're good to go |
| 1134 | */ |
| 1135 | list_del_init(&op->list); |
| 1136 | unlock_extent(&info->extent_ins, op->bytenr, |
| 1137 | op->bytenr + op->num_bytes - 1, GFP_NOFS); |
| 1138 | kfree(op); |
| 1139 | } |
| 1140 | |
| 1141 | btrfs_release_path(extent_root, path); |
| 1142 | if (!list_empty(del_list)) |
| 1143 | goto search; |
| 1144 | |
| 1145 | out: |
| 1146 | btrfs_free_path(path); |
| 1147 | return ret; |
| 1148 | } |
| 1149 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1150 | static int __btrfs_update_extent_ref(struct btrfs_trans_handle *trans, |
| 1151 | struct btrfs_root *root, u64 bytenr, |
| 1152 | u64 orig_parent, u64 parent, |
| 1153 | u64 orig_root, u64 ref_root, |
| 1154 | u64 orig_generation, u64 ref_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 1155 | u64 owner_objectid) |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1156 | { |
| 1157 | int ret; |
| 1158 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
| 1159 | struct btrfs_path *path; |
| 1160 | |
| 1161 | if (root == root->fs_info->extent_root) { |
| 1162 | struct pending_extent_op *extent_op; |
| 1163 | u64 num_bytes; |
| 1164 | |
| 1165 | BUG_ON(owner_objectid >= BTRFS_MAX_LEVEL); |
| 1166 | num_bytes = btrfs_level_size(root, (int)owner_objectid); |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 1167 | mutex_lock(&root->fs_info->extent_ins_mutex); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1168 | if (test_range_bit(&root->fs_info->extent_ins, bytenr, |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 1169 | bytenr + num_bytes - 1, EXTENT_WRITEBACK, 0)) { |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1170 | u64 priv; |
| 1171 | ret = get_state_private(&root->fs_info->extent_ins, |
| 1172 | bytenr, &priv); |
| 1173 | BUG_ON(ret); |
| 1174 | extent_op = (struct pending_extent_op *) |
| 1175 | (unsigned long)priv; |
| 1176 | BUG_ON(extent_op->parent != orig_parent); |
| 1177 | BUG_ON(extent_op->generation != orig_generation); |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 1178 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1179 | extent_op->parent = parent; |
| 1180 | extent_op->generation = ref_generation; |
| 1181 | } else { |
| 1182 | extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS); |
| 1183 | BUG_ON(!extent_op); |
| 1184 | |
| 1185 | extent_op->type = PENDING_BACKREF_UPDATE; |
| 1186 | extent_op->bytenr = bytenr; |
| 1187 | extent_op->num_bytes = num_bytes; |
| 1188 | extent_op->parent = parent; |
| 1189 | extent_op->orig_parent = orig_parent; |
| 1190 | extent_op->generation = ref_generation; |
| 1191 | extent_op->orig_generation = orig_generation; |
| 1192 | extent_op->level = (int)owner_objectid; |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 1193 | INIT_LIST_HEAD(&extent_op->list); |
| 1194 | extent_op->del = 0; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1195 | |
| 1196 | set_extent_bits(&root->fs_info->extent_ins, |
| 1197 | bytenr, bytenr + num_bytes - 1, |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 1198 | EXTENT_WRITEBACK, GFP_NOFS); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1199 | set_state_private(&root->fs_info->extent_ins, |
| 1200 | bytenr, (unsigned long)extent_op); |
| 1201 | } |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 1202 | mutex_unlock(&root->fs_info->extent_ins_mutex); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1203 | return 0; |
| 1204 | } |
| 1205 | |
| 1206 | path = btrfs_alloc_path(); |
| 1207 | if (!path) |
| 1208 | return -ENOMEM; |
| 1209 | ret = lookup_extent_backref(trans, extent_root, path, |
| 1210 | bytenr, orig_parent, orig_root, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 1211 | orig_generation, owner_objectid, 1); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1212 | if (ret) |
| 1213 | goto out; |
| 1214 | ret = remove_extent_backref(trans, extent_root, path); |
| 1215 | if (ret) |
| 1216 | goto out; |
| 1217 | ret = insert_extent_backref(trans, extent_root, path, bytenr, |
| 1218 | parent, ref_root, ref_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 1219 | owner_objectid); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1220 | BUG_ON(ret); |
Chris Mason | 87ef2bb | 2008-10-30 11:23:27 -0400 | [diff] [blame] | 1221 | finish_current_insert(trans, extent_root, 0); |
| 1222 | del_pending_extents(trans, extent_root, 0); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1223 | out: |
| 1224 | btrfs_free_path(path); |
| 1225 | return ret; |
| 1226 | } |
| 1227 | |
| 1228 | int btrfs_update_extent_ref(struct btrfs_trans_handle *trans, |
| 1229 | struct btrfs_root *root, u64 bytenr, |
| 1230 | u64 orig_parent, u64 parent, |
| 1231 | u64 ref_root, u64 ref_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 1232 | u64 owner_objectid) |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1233 | { |
| 1234 | int ret; |
| 1235 | if (ref_root == BTRFS_TREE_LOG_OBJECTID && |
| 1236 | owner_objectid < BTRFS_FIRST_FREE_OBJECTID) |
| 1237 | return 0; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1238 | ret = __btrfs_update_extent_ref(trans, root, bytenr, orig_parent, |
| 1239 | parent, ref_root, ref_root, |
| 1240 | ref_generation, ref_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 1241 | owner_objectid); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1242 | return ret; |
| 1243 | } |
| 1244 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1245 | static int __btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1246 | struct btrfs_root *root, u64 bytenr, |
| 1247 | u64 orig_parent, u64 parent, |
| 1248 | u64 orig_root, u64 ref_root, |
| 1249 | u64 orig_generation, u64 ref_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 1250 | u64 owner_objectid) |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 1251 | { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 1252 | struct btrfs_path *path; |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 1253 | int ret; |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 1254 | struct btrfs_key key; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1255 | struct extent_buffer *l; |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 1256 | struct btrfs_extent_item *item; |
Chris Mason | cf27e1e | 2007-03-13 09:49:06 -0400 | [diff] [blame] | 1257 | u32 refs; |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 1258 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 1259 | path = btrfs_alloc_path(); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1260 | if (!path) |
| 1261 | return -ENOMEM; |
Chris Mason | 26b8003 | 2007-08-08 20:17:12 -0400 | [diff] [blame] | 1262 | |
Chris Mason | 3c12ac7 | 2008-04-21 12:01:38 -0400 | [diff] [blame] | 1263 | path->reada = 1; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1264 | key.objectid = bytenr; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1265 | key.type = BTRFS_EXTENT_ITEM_KEY; |
| 1266 | key.offset = (u64)-1; |
| 1267 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 1268 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path, |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 1269 | 0, 1); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1270 | if (ret < 0) |
| 1271 | return ret; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1272 | BUG_ON(ret == 0 || path->slots[0] == 0); |
| 1273 | |
| 1274 | path->slots[0]--; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1275 | l = path->nodes[0]; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1276 | |
| 1277 | btrfs_item_key_to_cpu(l, &key, path->slots[0]); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1278 | if (key.objectid != bytenr) { |
| 1279 | btrfs_print_leaf(root->fs_info->extent_root, path->nodes[0]); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1280 | printk(KERN_ERR "btrfs wanted %llu found %llu\n", |
| 1281 | (unsigned long long)bytenr, |
| 1282 | (unsigned long long)key.objectid); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1283 | BUG(); |
| 1284 | } |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1285 | BUG_ON(key.type != BTRFS_EXTENT_ITEM_KEY); |
| 1286 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 1287 | item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1288 | refs = btrfs_extent_refs(l, item); |
| 1289 | btrfs_set_extent_refs(l, item, refs + 1); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 1290 | btrfs_mark_buffer_dirty(path->nodes[0]); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 1291 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 1292 | btrfs_release_path(root->fs_info->extent_root, path); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1293 | |
Chris Mason | 3c12ac7 | 2008-04-21 12:01:38 -0400 | [diff] [blame] | 1294 | path->reada = 1; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1295 | ret = insert_extent_backref(trans, root->fs_info->extent_root, |
| 1296 | path, bytenr, parent, |
| 1297 | ref_root, ref_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 1298 | owner_objectid); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1299 | BUG_ON(ret); |
Chris Mason | 87ef2bb | 2008-10-30 11:23:27 -0400 | [diff] [blame] | 1300 | finish_current_insert(trans, root->fs_info->extent_root, 0); |
| 1301 | del_pending_extents(trans, root->fs_info->extent_root, 0); |
Chris Mason | 74493f7 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 1302 | |
| 1303 | btrfs_free_path(path); |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 1304 | return 0; |
| 1305 | } |
| 1306 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1307 | int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1308 | struct btrfs_root *root, |
| 1309 | u64 bytenr, u64 num_bytes, u64 parent, |
| 1310 | u64 ref_root, u64 ref_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 1311 | u64 owner_objectid) |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1312 | { |
| 1313 | int ret; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1314 | if (ref_root == BTRFS_TREE_LOG_OBJECTID && |
| 1315 | owner_objectid < BTRFS_FIRST_FREE_OBJECTID) |
| 1316 | return 0; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1317 | ret = __btrfs_inc_extent_ref(trans, root, bytenr, 0, parent, |
| 1318 | 0, ref_root, 0, ref_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 1319 | owner_objectid); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1320 | return ret; |
| 1321 | } |
| 1322 | |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 1323 | int btrfs_extent_post_op(struct btrfs_trans_handle *trans, |
| 1324 | struct btrfs_root *root) |
| 1325 | { |
Chris Mason | 87ef2bb | 2008-10-30 11:23:27 -0400 | [diff] [blame] | 1326 | finish_current_insert(trans, root->fs_info->extent_root, 1); |
| 1327 | del_pending_extents(trans, root->fs_info->extent_root, 1); |
Chris Mason | e9d0b13 | 2007-08-10 14:06:19 -0400 | [diff] [blame] | 1328 | return 0; |
| 1329 | } |
| 1330 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1331 | int btrfs_lookup_extent_ref(struct btrfs_trans_handle *trans, |
| 1332 | struct btrfs_root *root, u64 bytenr, |
| 1333 | u64 num_bytes, u32 *refs) |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 1334 | { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 1335 | struct btrfs_path *path; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 1336 | int ret; |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 1337 | struct btrfs_key key; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1338 | struct extent_buffer *l; |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 1339 | struct btrfs_extent_item *item; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 1340 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1341 | WARN_ON(num_bytes < root->sectorsize); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 1342 | path = btrfs_alloc_path(); |
Chris Mason | 3c12ac7 | 2008-04-21 12:01:38 -0400 | [diff] [blame] | 1343 | path->reada = 1; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1344 | key.objectid = bytenr; |
| 1345 | key.offset = num_bytes; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 1346 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 1347 | ret = btrfs_search_slot(trans, root->fs_info->extent_root, &key, path, |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 1348 | 0, 0); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1349 | if (ret < 0) |
| 1350 | goto out; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1351 | if (ret != 0) { |
| 1352 | btrfs_print_leaf(root, path->nodes[0]); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1353 | printk(KERN_INFO "btrfs failed to find block number %llu\n", |
| 1354 | (unsigned long long)bytenr); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 1355 | BUG(); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1356 | } |
| 1357 | l = path->nodes[0]; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 1358 | item = btrfs_item_ptr(l, path->slots[0], struct btrfs_extent_item); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1359 | *refs = btrfs_extent_refs(l, item); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1360 | out: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 1361 | btrfs_free_path(path); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 1362 | return 0; |
| 1363 | } |
| 1364 | |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1365 | int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans, |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 1366 | struct btrfs_root *root, u64 objectid, u64 bytenr) |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1367 | { |
| 1368 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
| 1369 | struct btrfs_path *path; |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 1370 | struct extent_buffer *leaf; |
| 1371 | struct btrfs_extent_ref *ref_item; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1372 | struct btrfs_key key; |
| 1373 | struct btrfs_key found_key; |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1374 | u64 ref_root; |
| 1375 | u64 last_snapshot; |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 1376 | u32 nritems; |
| 1377 | int ret; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1378 | |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1379 | key.objectid = bytenr; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1380 | key.offset = (u64)-1; |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 1381 | key.type = BTRFS_EXTENT_ITEM_KEY; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1382 | |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 1383 | path = btrfs_alloc_path(); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1384 | ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0); |
| 1385 | if (ret < 0) |
| 1386 | goto out; |
| 1387 | BUG_ON(ret == 0); |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1388 | |
| 1389 | ret = -ENOENT; |
| 1390 | if (path->slots[0] == 0) |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1391 | goto out; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1392 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1393 | path->slots[0]--; |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 1394 | leaf = path->nodes[0]; |
| 1395 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1396 | |
| 1397 | if (found_key.objectid != bytenr || |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1398 | found_key.type != BTRFS_EXTENT_ITEM_KEY) |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1399 | goto out; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1400 | |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1401 | last_snapshot = btrfs_root_last_snapshot(&root->root_item); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1402 | while (1) { |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 1403 | leaf = path->nodes[0]; |
| 1404 | nritems = btrfs_header_nritems(leaf); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1405 | if (path->slots[0] >= nritems) { |
| 1406 | ret = btrfs_next_leaf(extent_root, path); |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 1407 | if (ret < 0) |
| 1408 | goto out; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1409 | if (ret == 0) |
| 1410 | continue; |
| 1411 | break; |
| 1412 | } |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 1413 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1414 | if (found_key.objectid != bytenr) |
| 1415 | break; |
Chris Mason | bd09835 | 2008-01-03 13:23:19 -0500 | [diff] [blame] | 1416 | |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1417 | if (found_key.type != BTRFS_EXTENT_REF_KEY) { |
| 1418 | path->slots[0]++; |
| 1419 | continue; |
| 1420 | } |
| 1421 | |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 1422 | ref_item = btrfs_item_ptr(leaf, path->slots[0], |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1423 | struct btrfs_extent_ref); |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1424 | ref_root = btrfs_ref_root(leaf, ref_item); |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 1425 | if ((ref_root != root->root_key.objectid && |
| 1426 | ref_root != BTRFS_TREE_LOG_OBJECTID) || |
| 1427 | objectid != btrfs_ref_objectid(leaf, ref_item)) { |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1428 | ret = 1; |
| 1429 | goto out; |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 1430 | } |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1431 | if (btrfs_ref_generation(leaf, ref_item) <= last_snapshot) { |
| 1432 | ret = 1; |
| 1433 | goto out; |
| 1434 | } |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 1435 | |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1436 | path->slots[0]++; |
| 1437 | } |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 1438 | ret = 0; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1439 | out: |
Yan Zheng | f321e49 | 2008-07-30 09:26:11 -0400 | [diff] [blame] | 1440 | btrfs_free_path(path); |
| 1441 | return ret; |
| 1442 | } |
| 1443 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1444 | int btrfs_cache_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
| 1445 | struct extent_buffer *buf, u32 nr_extents) |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 1446 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1447 | struct btrfs_key key; |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 1448 | struct btrfs_file_extent_item *fi; |
Zheng Yan | e465768 | 2008-09-26 10:04:53 -0400 | [diff] [blame] | 1449 | u64 root_gen; |
| 1450 | u32 nritems; |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 1451 | int i; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1452 | int level; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1453 | int ret = 0; |
Zheng Yan | e465768 | 2008-09-26 10:04:53 -0400 | [diff] [blame] | 1454 | int shared = 0; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 1455 | |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 1456 | if (!root->ref_cows) |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 1457 | return 0; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1458 | |
Zheng Yan | e465768 | 2008-09-26 10:04:53 -0400 | [diff] [blame] | 1459 | if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) { |
| 1460 | shared = 0; |
| 1461 | root_gen = root->root_key.offset; |
| 1462 | } else { |
| 1463 | shared = 1; |
| 1464 | root_gen = trans->transid - 1; |
| 1465 | } |
| 1466 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1467 | level = btrfs_header_level(buf); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1468 | nritems = btrfs_header_nritems(buf); |
Chris Mason | 4a09675 | 2008-07-21 10:29:44 -0400 | [diff] [blame] | 1469 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1470 | if (level == 0) { |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 1471 | struct btrfs_leaf_ref *ref; |
| 1472 | struct btrfs_extent_info *info; |
| 1473 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1474 | ref = btrfs_alloc_leaf_ref(root, nr_extents); |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 1475 | if (!ref) { |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1476 | ret = -ENOMEM; |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 1477 | goto out; |
| 1478 | } |
| 1479 | |
Zheng Yan | e465768 | 2008-09-26 10:04:53 -0400 | [diff] [blame] | 1480 | ref->root_gen = root_gen; |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 1481 | ref->bytenr = buf->start; |
| 1482 | ref->owner = btrfs_header_owner(buf); |
| 1483 | ref->generation = btrfs_header_generation(buf); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1484 | ref->nritems = nr_extents; |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 1485 | info = ref->extents; |
Yan | bcc63ab | 2008-07-30 16:29:20 -0400 | [diff] [blame] | 1486 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1487 | for (i = 0; nr_extents > 0 && i < nritems; i++) { |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 1488 | u64 disk_bytenr; |
| 1489 | btrfs_item_key_to_cpu(buf, &key, i); |
| 1490 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) |
| 1491 | continue; |
| 1492 | fi = btrfs_item_ptr(buf, i, |
| 1493 | struct btrfs_file_extent_item); |
| 1494 | if (btrfs_file_extent_type(buf, fi) == |
| 1495 | BTRFS_FILE_EXTENT_INLINE) |
| 1496 | continue; |
| 1497 | disk_bytenr = btrfs_file_extent_disk_bytenr(buf, fi); |
| 1498 | if (disk_bytenr == 0) |
| 1499 | continue; |
| 1500 | |
| 1501 | info->bytenr = disk_bytenr; |
| 1502 | info->num_bytes = |
| 1503 | btrfs_file_extent_disk_num_bytes(buf, fi); |
| 1504 | info->objectid = key.objectid; |
| 1505 | info->offset = key.offset; |
| 1506 | info++; |
| 1507 | } |
| 1508 | |
Zheng Yan | e465768 | 2008-09-26 10:04:53 -0400 | [diff] [blame] | 1509 | ret = btrfs_add_leaf_ref(root, ref, shared); |
Yan Zheng | 5b84e8d | 2008-10-09 11:46:19 -0400 | [diff] [blame] | 1510 | if (ret == -EEXIST && shared) { |
| 1511 | struct btrfs_leaf_ref *old; |
| 1512 | old = btrfs_lookup_leaf_ref(root, ref->bytenr); |
| 1513 | BUG_ON(!old); |
| 1514 | btrfs_remove_leaf_ref(root, old); |
| 1515 | btrfs_free_leaf_ref(root, old); |
| 1516 | ret = btrfs_add_leaf_ref(root, ref, shared); |
| 1517 | } |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 1518 | WARN_ON(ret); |
Yan | bcc63ab | 2008-07-30 16:29:20 -0400 | [diff] [blame] | 1519 | btrfs_free_leaf_ref(root, ref); |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 1520 | } |
| 1521 | out: |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1522 | return ret; |
| 1523 | } |
| 1524 | |
Chris Mason | b7a9f29 | 2009-02-04 09:23:45 -0500 | [diff] [blame] | 1525 | /* when a block goes through cow, we update the reference counts of |
| 1526 | * everything that block points to. The internal pointers of the block |
| 1527 | * can be in just about any order, and it is likely to have clusters of |
| 1528 | * things that are close together and clusters of things that are not. |
| 1529 | * |
| 1530 | * To help reduce the seeks that come with updating all of these reference |
| 1531 | * counts, sort them by byte number before actual updates are done. |
| 1532 | * |
| 1533 | * struct refsort is used to match byte number to slot in the btree block. |
| 1534 | * we sort based on the byte number and then use the slot to actually |
| 1535 | * find the item. |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 1536 | * |
| 1537 | * struct refsort is smaller than strcut btrfs_item and smaller than |
| 1538 | * struct btrfs_key_ptr. Since we're currently limited to the page size |
| 1539 | * for a btree block, there's no way for a kmalloc of refsorts for a |
| 1540 | * single node to be bigger than a page. |
Chris Mason | b7a9f29 | 2009-02-04 09:23:45 -0500 | [diff] [blame] | 1541 | */ |
| 1542 | struct refsort { |
| 1543 | u64 bytenr; |
| 1544 | u32 slot; |
| 1545 | }; |
| 1546 | |
| 1547 | /* |
| 1548 | * for passing into sort() |
| 1549 | */ |
| 1550 | static int refsort_cmp(const void *a_void, const void *b_void) |
| 1551 | { |
| 1552 | const struct refsort *a = a_void; |
| 1553 | const struct refsort *b = b_void; |
| 1554 | |
| 1555 | if (a->bytenr < b->bytenr) |
| 1556 | return -1; |
| 1557 | if (a->bytenr > b->bytenr) |
| 1558 | return 1; |
| 1559 | return 0; |
| 1560 | } |
| 1561 | |
| 1562 | |
| 1563 | noinline int btrfs_inc_ref(struct btrfs_trans_handle *trans, |
| 1564 | struct btrfs_root *root, |
| 1565 | struct extent_buffer *orig_buf, |
| 1566 | struct extent_buffer *buf, u32 *nr_extents) |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1567 | { |
| 1568 | u64 bytenr; |
| 1569 | u64 ref_root; |
| 1570 | u64 orig_root; |
| 1571 | u64 ref_generation; |
| 1572 | u64 orig_generation; |
Chris Mason | b7a9f29 | 2009-02-04 09:23:45 -0500 | [diff] [blame] | 1573 | struct refsort *sorted; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1574 | u32 nritems; |
| 1575 | u32 nr_file_extents = 0; |
| 1576 | struct btrfs_key key; |
| 1577 | struct btrfs_file_extent_item *fi; |
| 1578 | int i; |
| 1579 | int level; |
| 1580 | int ret = 0; |
| 1581 | int faili = 0; |
Chris Mason | b7a9f29 | 2009-02-04 09:23:45 -0500 | [diff] [blame] | 1582 | int refi = 0; |
| 1583 | int slot; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1584 | int (*process_func)(struct btrfs_trans_handle *, struct btrfs_root *, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 1585 | u64, u64, u64, u64, u64, u64, u64, u64); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1586 | |
| 1587 | ref_root = btrfs_header_owner(buf); |
| 1588 | ref_generation = btrfs_header_generation(buf); |
| 1589 | orig_root = btrfs_header_owner(orig_buf); |
| 1590 | orig_generation = btrfs_header_generation(orig_buf); |
| 1591 | |
| 1592 | nritems = btrfs_header_nritems(buf); |
| 1593 | level = btrfs_header_level(buf); |
| 1594 | |
Chris Mason | b7a9f29 | 2009-02-04 09:23:45 -0500 | [diff] [blame] | 1595 | sorted = kmalloc(sizeof(struct refsort) * nritems, GFP_NOFS); |
| 1596 | BUG_ON(!sorted); |
| 1597 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1598 | if (root->ref_cows) { |
| 1599 | process_func = __btrfs_inc_extent_ref; |
| 1600 | } else { |
| 1601 | if (level == 0 && |
| 1602 | root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) |
| 1603 | goto out; |
| 1604 | if (level != 0 && |
| 1605 | root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) |
| 1606 | goto out; |
| 1607 | process_func = __btrfs_update_extent_ref; |
| 1608 | } |
| 1609 | |
Chris Mason | b7a9f29 | 2009-02-04 09:23:45 -0500 | [diff] [blame] | 1610 | /* |
| 1611 | * we make two passes through the items. In the first pass we |
| 1612 | * only record the byte number and slot. Then we sort based on |
| 1613 | * byte number and do the actual work based on the sorted results |
| 1614 | */ |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1615 | for (i = 0; i < nritems; i++) { |
| 1616 | cond_resched(); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1617 | if (level == 0) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1618 | btrfs_item_key_to_cpu(buf, &key, i); |
| 1619 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1620 | continue; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1621 | fi = btrfs_item_ptr(buf, i, |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1622 | struct btrfs_file_extent_item); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1623 | if (btrfs_file_extent_type(buf, fi) == |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1624 | BTRFS_FILE_EXTENT_INLINE) |
| 1625 | continue; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1626 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); |
| 1627 | if (bytenr == 0) |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1628 | continue; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1629 | |
| 1630 | nr_file_extents++; |
Chris Mason | b7a9f29 | 2009-02-04 09:23:45 -0500 | [diff] [blame] | 1631 | sorted[refi].bytenr = bytenr; |
| 1632 | sorted[refi].slot = i; |
| 1633 | refi++; |
| 1634 | } else { |
| 1635 | bytenr = btrfs_node_blockptr(buf, i); |
| 1636 | sorted[refi].bytenr = bytenr; |
| 1637 | sorted[refi].slot = i; |
| 1638 | refi++; |
| 1639 | } |
| 1640 | } |
| 1641 | /* |
| 1642 | * if refi == 0, we didn't actually put anything into the sorted |
| 1643 | * array and we're done |
| 1644 | */ |
| 1645 | if (refi == 0) |
| 1646 | goto out; |
| 1647 | |
| 1648 | sort(sorted, refi, sizeof(struct refsort), refsort_cmp, NULL); |
| 1649 | |
| 1650 | for (i = 0; i < refi; i++) { |
| 1651 | cond_resched(); |
| 1652 | slot = sorted[i].slot; |
| 1653 | bytenr = sorted[i].bytenr; |
| 1654 | |
| 1655 | if (level == 0) { |
| 1656 | btrfs_item_key_to_cpu(buf, &key, slot); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1657 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1658 | ret = process_func(trans, root, bytenr, |
| 1659 | orig_buf->start, buf->start, |
| 1660 | orig_root, ref_root, |
| 1661 | orig_generation, ref_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 1662 | key.objectid); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1663 | |
| 1664 | if (ret) { |
Chris Mason | b7a9f29 | 2009-02-04 09:23:45 -0500 | [diff] [blame] | 1665 | faili = slot; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1666 | WARN_ON(1); |
| 1667 | goto fail; |
| 1668 | } |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1669 | } else { |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1670 | ret = process_func(trans, root, bytenr, |
| 1671 | orig_buf->start, buf->start, |
| 1672 | orig_root, ref_root, |
| 1673 | orig_generation, ref_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 1674 | level - 1); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1675 | if (ret) { |
Chris Mason | b7a9f29 | 2009-02-04 09:23:45 -0500 | [diff] [blame] | 1676 | faili = slot; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1677 | WARN_ON(1); |
| 1678 | goto fail; |
| 1679 | } |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1680 | } |
| 1681 | } |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1682 | out: |
Chris Mason | b7a9f29 | 2009-02-04 09:23:45 -0500 | [diff] [blame] | 1683 | kfree(sorted); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1684 | if (nr_extents) { |
| 1685 | if (level == 0) |
| 1686 | *nr_extents = nr_file_extents; |
| 1687 | else |
| 1688 | *nr_extents = nritems; |
| 1689 | } |
| 1690 | return 0; |
| 1691 | fail: |
Chris Mason | b7a9f29 | 2009-02-04 09:23:45 -0500 | [diff] [blame] | 1692 | kfree(sorted); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1693 | WARN_ON(1); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1694 | return ret; |
Chris Mason | 02217ed | 2007-03-02 16:08:05 -0500 | [diff] [blame] | 1695 | } |
| 1696 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1697 | int btrfs_update_ref(struct btrfs_trans_handle *trans, |
| 1698 | struct btrfs_root *root, struct extent_buffer *orig_buf, |
| 1699 | struct extent_buffer *buf, int start_slot, int nr) |
| 1700 | |
| 1701 | { |
| 1702 | u64 bytenr; |
| 1703 | u64 ref_root; |
| 1704 | u64 orig_root; |
| 1705 | u64 ref_generation; |
| 1706 | u64 orig_generation; |
| 1707 | struct btrfs_key key; |
| 1708 | struct btrfs_file_extent_item *fi; |
| 1709 | int i; |
| 1710 | int ret; |
| 1711 | int slot; |
| 1712 | int level; |
| 1713 | |
| 1714 | BUG_ON(start_slot < 0); |
| 1715 | BUG_ON(start_slot + nr > btrfs_header_nritems(buf)); |
| 1716 | |
| 1717 | ref_root = btrfs_header_owner(buf); |
| 1718 | ref_generation = btrfs_header_generation(buf); |
| 1719 | orig_root = btrfs_header_owner(orig_buf); |
| 1720 | orig_generation = btrfs_header_generation(orig_buf); |
| 1721 | level = btrfs_header_level(buf); |
| 1722 | |
| 1723 | if (!root->ref_cows) { |
| 1724 | if (level == 0 && |
| 1725 | root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) |
| 1726 | return 0; |
| 1727 | if (level != 0 && |
| 1728 | root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) |
| 1729 | return 0; |
| 1730 | } |
| 1731 | |
| 1732 | for (i = 0, slot = start_slot; i < nr; i++, slot++) { |
| 1733 | cond_resched(); |
| 1734 | if (level == 0) { |
| 1735 | btrfs_item_key_to_cpu(buf, &key, slot); |
| 1736 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) |
| 1737 | continue; |
| 1738 | fi = btrfs_item_ptr(buf, slot, |
| 1739 | struct btrfs_file_extent_item); |
| 1740 | if (btrfs_file_extent_type(buf, fi) == |
| 1741 | BTRFS_FILE_EXTENT_INLINE) |
| 1742 | continue; |
| 1743 | bytenr = btrfs_file_extent_disk_bytenr(buf, fi); |
| 1744 | if (bytenr == 0) |
| 1745 | continue; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1746 | ret = __btrfs_update_extent_ref(trans, root, bytenr, |
| 1747 | orig_buf->start, buf->start, |
| 1748 | orig_root, ref_root, |
| 1749 | orig_generation, ref_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 1750 | key.objectid); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1751 | if (ret) |
| 1752 | goto fail; |
| 1753 | } else { |
| 1754 | bytenr = btrfs_node_blockptr(buf, slot); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1755 | ret = __btrfs_update_extent_ref(trans, root, bytenr, |
| 1756 | orig_buf->start, buf->start, |
| 1757 | orig_root, ref_root, |
| 1758 | orig_generation, ref_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 1759 | level - 1); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 1760 | if (ret) |
| 1761 | goto fail; |
| 1762 | } |
| 1763 | } |
| 1764 | return 0; |
| 1765 | fail: |
| 1766 | WARN_ON(1); |
| 1767 | return -1; |
| 1768 | } |
| 1769 | |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1770 | static int write_one_cache_group(struct btrfs_trans_handle *trans, |
| 1771 | struct btrfs_root *root, |
| 1772 | struct btrfs_path *path, |
| 1773 | struct btrfs_block_group_cache *cache) |
| 1774 | { |
| 1775 | int ret; |
| 1776 | int pending_ret; |
| 1777 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1778 | unsigned long bi; |
| 1779 | struct extent_buffer *leaf; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1780 | |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1781 | ret = btrfs_search_slot(trans, extent_root, &cache->key, path, 0, 1); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1782 | if (ret < 0) |
| 1783 | goto fail; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1784 | BUG_ON(ret); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 1785 | |
| 1786 | leaf = path->nodes[0]; |
| 1787 | bi = btrfs_item_ptr_offset(leaf, path->slots[0]); |
| 1788 | write_extent_buffer(leaf, &cache->item, bi, sizeof(cache->item)); |
| 1789 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1790 | btrfs_release_path(extent_root, path); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1791 | fail: |
Chris Mason | 87ef2bb | 2008-10-30 11:23:27 -0400 | [diff] [blame] | 1792 | finish_current_insert(trans, extent_root, 0); |
| 1793 | pending_ret = del_pending_extents(trans, extent_root, 0); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1794 | if (ret) |
| 1795 | return ret; |
| 1796 | if (pending_ret) |
| 1797 | return pending_ret; |
| 1798 | return 0; |
| 1799 | |
| 1800 | } |
| 1801 | |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 1802 | int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, |
| 1803 | struct btrfs_root *root) |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1804 | { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1805 | struct btrfs_block_group_cache *cache, *entry; |
| 1806 | struct rb_node *n; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1807 | int err = 0; |
| 1808 | int werr = 0; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1809 | struct btrfs_path *path; |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 1810 | u64 last = 0; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1811 | |
| 1812 | path = btrfs_alloc_path(); |
| 1813 | if (!path) |
| 1814 | return -ENOMEM; |
| 1815 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1816 | while (1) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1817 | cache = NULL; |
| 1818 | spin_lock(&root->fs_info->block_group_cache_lock); |
| 1819 | for (n = rb_first(&root->fs_info->block_group_cache_tree); |
| 1820 | n; n = rb_next(n)) { |
| 1821 | entry = rb_entry(n, struct btrfs_block_group_cache, |
| 1822 | cache_node); |
| 1823 | if (entry->dirty) { |
| 1824 | cache = entry; |
| 1825 | break; |
| 1826 | } |
| 1827 | } |
| 1828 | spin_unlock(&root->fs_info->block_group_cache_lock); |
| 1829 | |
| 1830 | if (!cache) |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1831 | break; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 1832 | |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 1833 | cache->dirty = 0; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1834 | last += cache->key.offset; |
| 1835 | |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 1836 | err = write_one_cache_group(trans, root, |
| 1837 | path, cache); |
| 1838 | /* |
| 1839 | * if we fail to write the cache group, we want |
| 1840 | * to keep it marked dirty in hopes that a later |
| 1841 | * write will work |
| 1842 | */ |
| 1843 | if (err) { |
| 1844 | werr = err; |
| 1845 | continue; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 1846 | } |
| 1847 | } |
| 1848 | btrfs_free_path(path); |
| 1849 | return werr; |
| 1850 | } |
| 1851 | |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 1852 | int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr) |
| 1853 | { |
| 1854 | struct btrfs_block_group_cache *block_group; |
| 1855 | int readonly = 0; |
| 1856 | |
| 1857 | block_group = btrfs_lookup_block_group(root->fs_info, bytenr); |
| 1858 | if (!block_group || block_group->ro) |
| 1859 | readonly = 1; |
| 1860 | if (block_group) |
| 1861 | put_block_group(block_group); |
| 1862 | return readonly; |
| 1863 | } |
| 1864 | |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 1865 | static int update_space_info(struct btrfs_fs_info *info, u64 flags, |
| 1866 | u64 total_bytes, u64 bytes_used, |
| 1867 | struct btrfs_space_info **space_info) |
| 1868 | { |
| 1869 | struct btrfs_space_info *found; |
| 1870 | |
| 1871 | found = __find_space_info(info, flags); |
| 1872 | if (found) { |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 1873 | spin_lock(&found->lock); |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 1874 | found->total_bytes += total_bytes; |
| 1875 | found->bytes_used += bytes_used; |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 1876 | found->full = 0; |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 1877 | spin_unlock(&found->lock); |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 1878 | *space_info = found; |
| 1879 | return 0; |
| 1880 | } |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1881 | found = kzalloc(sizeof(*found), GFP_NOFS); |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 1882 | if (!found) |
| 1883 | return -ENOMEM; |
| 1884 | |
| 1885 | list_add(&found->list, &info->space_info); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1886 | INIT_LIST_HEAD(&found->block_groups); |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 1887 | init_rwsem(&found->groups_sem); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1888 | spin_lock_init(&found->lock); |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 1889 | found->flags = flags; |
| 1890 | found->total_bytes = total_bytes; |
| 1891 | found->bytes_used = bytes_used; |
| 1892 | found->bytes_pinned = 0; |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 1893 | found->bytes_reserved = 0; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1894 | found->bytes_readonly = 0; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 1895 | found->full = 0; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 1896 | found->force_alloc = 0; |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 1897 | *space_info = found; |
| 1898 | return 0; |
| 1899 | } |
| 1900 | |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 1901 | static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags) |
| 1902 | { |
| 1903 | u64 extra_flags = flags & (BTRFS_BLOCK_GROUP_RAID0 | |
Chris Mason | 611f0e0 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 1904 | BTRFS_BLOCK_GROUP_RAID1 | |
Chris Mason | 321aecc | 2008-04-16 10:49:51 -0400 | [diff] [blame] | 1905 | BTRFS_BLOCK_GROUP_RAID10 | |
Chris Mason | 611f0e0 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 1906 | BTRFS_BLOCK_GROUP_DUP); |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 1907 | if (extra_flags) { |
| 1908 | if (flags & BTRFS_BLOCK_GROUP_DATA) |
| 1909 | fs_info->avail_data_alloc_bits |= extra_flags; |
| 1910 | if (flags & BTRFS_BLOCK_GROUP_METADATA) |
| 1911 | fs_info->avail_metadata_alloc_bits |= extra_flags; |
| 1912 | if (flags & BTRFS_BLOCK_GROUP_SYSTEM) |
| 1913 | fs_info->avail_system_alloc_bits |= extra_flags; |
| 1914 | } |
| 1915 | } |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 1916 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1917 | static void set_block_group_readonly(struct btrfs_block_group_cache *cache) |
| 1918 | { |
| 1919 | spin_lock(&cache->space_info->lock); |
| 1920 | spin_lock(&cache->lock); |
| 1921 | if (!cache->ro) { |
| 1922 | cache->space_info->bytes_readonly += cache->key.offset - |
| 1923 | btrfs_block_group_used(&cache->item); |
| 1924 | cache->ro = 1; |
| 1925 | } |
| 1926 | spin_unlock(&cache->lock); |
| 1927 | spin_unlock(&cache->space_info->lock); |
| 1928 | } |
| 1929 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1930 | u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags) |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1931 | { |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1932 | u64 num_devices = root->fs_info->fs_devices->rw_devices; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1933 | |
| 1934 | if (num_devices == 1) |
| 1935 | flags &= ~(BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID0); |
| 1936 | if (num_devices < 4) |
| 1937 | flags &= ~BTRFS_BLOCK_GROUP_RAID10; |
| 1938 | |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1939 | if ((flags & BTRFS_BLOCK_GROUP_DUP) && |
| 1940 | (flags & (BTRFS_BLOCK_GROUP_RAID1 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1941 | BTRFS_BLOCK_GROUP_RAID10))) { |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1942 | flags &= ~BTRFS_BLOCK_GROUP_DUP; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1943 | } |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1944 | |
| 1945 | if ((flags & BTRFS_BLOCK_GROUP_RAID1) && |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1946 | (flags & BTRFS_BLOCK_GROUP_RAID10)) { |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1947 | flags &= ~BTRFS_BLOCK_GROUP_RAID1; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 1948 | } |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1949 | |
| 1950 | if ((flags & BTRFS_BLOCK_GROUP_RAID0) && |
| 1951 | ((flags & BTRFS_BLOCK_GROUP_RAID1) | |
| 1952 | (flags & BTRFS_BLOCK_GROUP_RAID10) | |
| 1953 | (flags & BTRFS_BLOCK_GROUP_DUP))) |
| 1954 | flags &= ~BTRFS_BLOCK_GROUP_RAID0; |
| 1955 | return flags; |
| 1956 | } |
| 1957 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1958 | static int do_chunk_alloc(struct btrfs_trans_handle *trans, |
| 1959 | struct btrfs_root *extent_root, u64 alloc_bytes, |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 1960 | u64 flags, int force) |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1961 | { |
| 1962 | struct btrfs_space_info *space_info; |
| 1963 | u64 thresh; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1964 | int ret = 0; |
| 1965 | |
| 1966 | mutex_lock(&extent_root->fs_info->chunk_mutex); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1967 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1968 | flags = btrfs_reduce_alloc_profile(extent_root, flags); |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 1969 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1970 | space_info = __find_space_info(extent_root->fs_info, flags); |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 1971 | if (!space_info) { |
| 1972 | ret = update_space_info(extent_root->fs_info, flags, |
| 1973 | 0, 0, &space_info); |
| 1974 | BUG_ON(ret); |
| 1975 | } |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1976 | BUG_ON(!space_info); |
| 1977 | |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 1978 | spin_lock(&space_info->lock); |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 1979 | if (space_info->force_alloc) { |
| 1980 | force = 1; |
| 1981 | space_info->force_alloc = 0; |
| 1982 | } |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 1983 | if (space_info->full) { |
| 1984 | spin_unlock(&space_info->lock); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1985 | goto out; |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 1986 | } |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 1987 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 1988 | thresh = space_info->total_bytes - space_info->bytes_readonly; |
| 1989 | thresh = div_factor(thresh, 6); |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 1990 | if (!force && |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 1991 | (space_info->bytes_used + space_info->bytes_pinned + |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 1992 | space_info->bytes_reserved + alloc_bytes) < thresh) { |
| 1993 | spin_unlock(&space_info->lock); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1994 | goto out; |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 1995 | } |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 1996 | spin_unlock(&space_info->lock); |
| 1997 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 1998 | ret = btrfs_alloc_chunk(trans, extent_root, flags); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1999 | if (ret) |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 2000 | space_info->full = 1; |
Chris Mason | a74a4b9 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 2001 | out: |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 2002 | mutex_unlock(&extent_root->fs_info->chunk_mutex); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2003 | return ret; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 2004 | } |
| 2005 | |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 2006 | static int update_block_group(struct btrfs_trans_handle *trans, |
| 2007 | struct btrfs_root *root, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2008 | u64 bytenr, u64 num_bytes, int alloc, |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2009 | int mark_free) |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 2010 | { |
| 2011 | struct btrfs_block_group_cache *cache; |
| 2012 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2013 | u64 total = num_bytes; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 2014 | u64 old_val; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2015 | u64 byte_in_group; |
Chris Mason | 3e1ad54 | 2007-05-07 20:03:49 -0400 | [diff] [blame] | 2016 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2017 | while (total) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2018 | cache = btrfs_lookup_block_group(info, bytenr); |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2019 | if (!cache) |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 2020 | return -1; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2021 | byte_in_group = bytenr - cache->key.objectid; |
| 2022 | WARN_ON(byte_in_group > cache->key.offset); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 2023 | |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2024 | spin_lock(&cache->space_info->lock); |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 2025 | spin_lock(&cache->lock); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2026 | cache->dirty = 1; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 2027 | old_val = btrfs_block_group_used(&cache->item); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2028 | num_bytes = min(total, cache->key.offset - byte_in_group); |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 2029 | if (alloc) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2030 | old_val += num_bytes; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 2031 | cache->space_info->bytes_used += num_bytes; |
Yan Zheng | a512bbf | 2008-12-08 16:46:26 -0500 | [diff] [blame] | 2032 | if (cache->ro) |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 2033 | cache->space_info->bytes_readonly -= num_bytes; |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 2034 | btrfs_set_block_group_used(&cache->item, old_val); |
| 2035 | spin_unlock(&cache->lock); |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2036 | spin_unlock(&cache->space_info->lock); |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 2037 | } else { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2038 | old_val -= num_bytes; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 2039 | cache->space_info->bytes_used -= num_bytes; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 2040 | if (cache->ro) |
| 2041 | cache->space_info->bytes_readonly += num_bytes; |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 2042 | btrfs_set_block_group_used(&cache->item, old_val); |
| 2043 | spin_unlock(&cache->lock); |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2044 | spin_unlock(&cache->space_info->lock); |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 2045 | if (mark_free) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2046 | int ret; |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 2047 | |
| 2048 | ret = btrfs_discard_extent(root, bytenr, |
| 2049 | num_bytes); |
| 2050 | WARN_ON(ret); |
| 2051 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2052 | ret = btrfs_add_free_space(cache, bytenr, |
| 2053 | num_bytes); |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 2054 | WARN_ON(ret); |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 2055 | } |
Chris Mason | cd1bc46 | 2007-04-27 10:08:34 -0400 | [diff] [blame] | 2056 | } |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 2057 | put_block_group(cache); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2058 | total -= num_bytes; |
| 2059 | bytenr += num_bytes; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 2060 | } |
| 2061 | return 0; |
| 2062 | } |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 2063 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 2064 | static u64 first_logical_byte(struct btrfs_root *root, u64 search_start) |
| 2065 | { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2066 | struct btrfs_block_group_cache *cache; |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 2067 | u64 bytenr; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2068 | |
| 2069 | cache = btrfs_lookup_first_block_group(root->fs_info, search_start); |
| 2070 | if (!cache) |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 2071 | return 0; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2072 | |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 2073 | bytenr = cache->key.objectid; |
| 2074 | put_block_group(cache); |
| 2075 | |
| 2076 | return bytenr; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 2077 | } |
| 2078 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2079 | int btrfs_update_pinned_extents(struct btrfs_root *root, |
Yan | 324ae4d | 2007-11-16 14:57:08 -0500 | [diff] [blame] | 2080 | u64 bytenr, u64 num, int pin) |
| 2081 | { |
| 2082 | u64 len; |
| 2083 | struct btrfs_block_group_cache *cache; |
| 2084 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 2085 | |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2086 | WARN_ON(!mutex_is_locked(&root->fs_info->pinned_mutex)); |
Yan | 324ae4d | 2007-11-16 14:57:08 -0500 | [diff] [blame] | 2087 | if (pin) { |
| 2088 | set_extent_dirty(&fs_info->pinned_extents, |
| 2089 | bytenr, bytenr + num - 1, GFP_NOFS); |
| 2090 | } else { |
| 2091 | clear_extent_dirty(&fs_info->pinned_extents, |
| 2092 | bytenr, bytenr + num - 1, GFP_NOFS); |
| 2093 | } |
| 2094 | while (num > 0) { |
| 2095 | cache = btrfs_lookup_block_group(fs_info, bytenr); |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 2096 | BUG_ON(!cache); |
| 2097 | len = min(num, cache->key.offset - |
| 2098 | (bytenr - cache->key.objectid)); |
Yan | 324ae4d | 2007-11-16 14:57:08 -0500 | [diff] [blame] | 2099 | if (pin) { |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2100 | spin_lock(&cache->space_info->lock); |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 2101 | spin_lock(&cache->lock); |
| 2102 | cache->pinned += len; |
| 2103 | cache->space_info->bytes_pinned += len; |
| 2104 | spin_unlock(&cache->lock); |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2105 | spin_unlock(&cache->space_info->lock); |
Yan | 324ae4d | 2007-11-16 14:57:08 -0500 | [diff] [blame] | 2106 | fs_info->total_pinned += len; |
| 2107 | } else { |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2108 | spin_lock(&cache->space_info->lock); |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 2109 | spin_lock(&cache->lock); |
| 2110 | cache->pinned -= len; |
| 2111 | cache->space_info->bytes_pinned -= len; |
| 2112 | spin_unlock(&cache->lock); |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2113 | spin_unlock(&cache->space_info->lock); |
Yan | 324ae4d | 2007-11-16 14:57:08 -0500 | [diff] [blame] | 2114 | fs_info->total_pinned -= len; |
Josef Bacik | 07103a3 | 2008-11-19 15:17:55 -0500 | [diff] [blame] | 2115 | if (cache->cached) |
| 2116 | btrfs_add_free_space(cache, bytenr, len); |
Yan | 324ae4d | 2007-11-16 14:57:08 -0500 | [diff] [blame] | 2117 | } |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 2118 | put_block_group(cache); |
Yan | 324ae4d | 2007-11-16 14:57:08 -0500 | [diff] [blame] | 2119 | bytenr += len; |
| 2120 | num -= len; |
| 2121 | } |
| 2122 | return 0; |
| 2123 | } |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 2124 | |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 2125 | static int update_reserved_extents(struct btrfs_root *root, |
| 2126 | u64 bytenr, u64 num, int reserve) |
| 2127 | { |
| 2128 | u64 len; |
| 2129 | struct btrfs_block_group_cache *cache; |
| 2130 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 2131 | |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 2132 | while (num > 0) { |
| 2133 | cache = btrfs_lookup_block_group(fs_info, bytenr); |
| 2134 | BUG_ON(!cache); |
| 2135 | len = min(num, cache->key.offset - |
| 2136 | (bytenr - cache->key.objectid)); |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2137 | |
| 2138 | spin_lock(&cache->space_info->lock); |
| 2139 | spin_lock(&cache->lock); |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 2140 | if (reserve) { |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 2141 | cache->reserved += len; |
| 2142 | cache->space_info->bytes_reserved += len; |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 2143 | } else { |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 2144 | cache->reserved -= len; |
| 2145 | cache->space_info->bytes_reserved -= len; |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 2146 | } |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2147 | spin_unlock(&cache->lock); |
| 2148 | spin_unlock(&cache->space_info->lock); |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 2149 | put_block_group(cache); |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 2150 | bytenr += len; |
| 2151 | num -= len; |
| 2152 | } |
| 2153 | return 0; |
| 2154 | } |
| 2155 | |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 2156 | int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy) |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 2157 | { |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 2158 | u64 last = 0; |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 2159 | u64 start; |
| 2160 | u64 end; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 2161 | struct extent_io_tree *pinned_extents = &root->fs_info->pinned_extents; |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 2162 | int ret; |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 2163 | |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2164 | mutex_lock(&root->fs_info->pinned_mutex); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2165 | while (1) { |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 2166 | ret = find_first_extent_bit(pinned_extents, last, |
| 2167 | &start, &end, EXTENT_DIRTY); |
| 2168 | if (ret) |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 2169 | break; |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 2170 | set_extent_dirty(copy, start, end, GFP_NOFS); |
| 2171 | last = end + 1; |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 2172 | } |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2173 | mutex_unlock(&root->fs_info->pinned_mutex); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 2174 | return 0; |
| 2175 | } |
| 2176 | |
| 2177 | int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, |
| 2178 | struct btrfs_root *root, |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 2179 | struct extent_io_tree *unpin) |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 2180 | { |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 2181 | u64 start; |
| 2182 | u64 end; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 2183 | int ret; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 2184 | |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2185 | mutex_lock(&root->fs_info->pinned_mutex); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2186 | while (1) { |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 2187 | ret = find_first_extent_bit(unpin, 0, &start, &end, |
| 2188 | EXTENT_DIRTY); |
| 2189 | if (ret) |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 2190 | break; |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 2191 | |
| 2192 | ret = btrfs_discard_extent(root, start, end + 1 - start); |
| 2193 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2194 | btrfs_update_pinned_extents(root, start, end + 1 - start, 0); |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 2195 | clear_extent_dirty(unpin, start, end, GFP_NOFS); |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 2196 | |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 2197 | if (need_resched()) { |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2198 | mutex_unlock(&root->fs_info->pinned_mutex); |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 2199 | cond_resched(); |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2200 | mutex_lock(&root->fs_info->pinned_mutex); |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 2201 | } |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 2202 | } |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2203 | mutex_unlock(&root->fs_info->pinned_mutex); |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 2204 | return ret; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 2205 | } |
| 2206 | |
Chris Mason | 98ed517 | 2008-01-03 10:01:48 -0500 | [diff] [blame] | 2207 | static int finish_current_insert(struct btrfs_trans_handle *trans, |
Chris Mason | 87ef2bb | 2008-10-30 11:23:27 -0400 | [diff] [blame] | 2208 | struct btrfs_root *extent_root, int all) |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 2209 | { |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2210 | u64 start; |
| 2211 | u64 end; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2212 | u64 priv; |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2213 | u64 search = 0; |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2214 | u64 skipped = 0; |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2215 | struct btrfs_fs_info *info = extent_root->fs_info; |
| 2216 | struct btrfs_path *path; |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2217 | struct pending_extent_op *extent_op, *tmp; |
| 2218 | struct list_head insert_list, update_list; |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 2219 | int ret; |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2220 | int num_inserts = 0, max_inserts; |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 2221 | |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2222 | path = btrfs_alloc_path(); |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2223 | INIT_LIST_HEAD(&insert_list); |
| 2224 | INIT_LIST_HEAD(&update_list); |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 2225 | |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2226 | max_inserts = extent_root->leafsize / |
| 2227 | (2 * sizeof(struct btrfs_key) + 2 * sizeof(struct btrfs_item) + |
| 2228 | sizeof(struct btrfs_extent_ref) + |
| 2229 | sizeof(struct btrfs_extent_item)); |
| 2230 | again: |
| 2231 | mutex_lock(&info->extent_ins_mutex); |
| 2232 | while (1) { |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2233 | ret = find_first_extent_bit(&info->extent_ins, search, &start, |
| 2234 | &end, EXTENT_WRITEBACK); |
| 2235 | if (ret) { |
Yan Zheng | 5a7be51 | 2009-01-21 10:49:16 -0500 | [diff] [blame] | 2236 | if (skipped && all && !num_inserts && |
| 2237 | list_empty(&update_list)) { |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2238 | skipped = 0; |
Liu Hui | b4eec2c | 2008-11-18 11:30:10 -0500 | [diff] [blame] | 2239 | search = 0; |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2240 | continue; |
| 2241 | } |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2242 | mutex_unlock(&info->extent_ins_mutex); |
Chris Mason | 26b8003 | 2007-08-08 20:17:12 -0400 | [diff] [blame] | 2243 | break; |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2244 | } |
| 2245 | |
| 2246 | ret = try_lock_extent(&info->extent_ins, start, end, GFP_NOFS); |
| 2247 | if (!ret) { |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2248 | skipped = 1; |
Chris Mason | 87ef2bb | 2008-10-30 11:23:27 -0400 | [diff] [blame] | 2249 | search = end + 1; |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2250 | if (need_resched()) { |
| 2251 | mutex_unlock(&info->extent_ins_mutex); |
| 2252 | cond_resched(); |
| 2253 | mutex_lock(&info->extent_ins_mutex); |
| 2254 | } |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2255 | continue; |
| 2256 | } |
Chris Mason | 26b8003 | 2007-08-08 20:17:12 -0400 | [diff] [blame] | 2257 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2258 | ret = get_state_private(&info->extent_ins, start, &priv); |
| 2259 | BUG_ON(ret); |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2260 | extent_op = (struct pending_extent_op *)(unsigned long) priv; |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2261 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2262 | if (extent_op->type == PENDING_EXTENT_INSERT) { |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2263 | num_inserts++; |
| 2264 | list_add_tail(&extent_op->list, &insert_list); |
Chris Mason | 87ef2bb | 2008-10-30 11:23:27 -0400 | [diff] [blame] | 2265 | search = end + 1; |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2266 | if (num_inserts == max_inserts) { |
| 2267 | mutex_unlock(&info->extent_ins_mutex); |
| 2268 | break; |
| 2269 | } |
| 2270 | } else if (extent_op->type == PENDING_BACKREF_UPDATE) { |
| 2271 | list_add_tail(&extent_op->list, &update_list); |
| 2272 | search = end + 1; |
| 2273 | } else { |
| 2274 | BUG(); |
| 2275 | } |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 2276 | } |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2277 | |
| 2278 | /* |
Liu Hui | b4eec2c | 2008-11-18 11:30:10 -0500 | [diff] [blame] | 2279 | * process the update list, clear the writeback bit for it, and if |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2280 | * somebody marked this thing for deletion then just unlock it and be |
| 2281 | * done, the free_extents will handle it |
| 2282 | */ |
| 2283 | mutex_lock(&info->extent_ins_mutex); |
| 2284 | list_for_each_entry_safe(extent_op, tmp, &update_list, list) { |
| 2285 | clear_extent_bits(&info->extent_ins, extent_op->bytenr, |
| 2286 | extent_op->bytenr + extent_op->num_bytes - 1, |
| 2287 | EXTENT_WRITEBACK, GFP_NOFS); |
| 2288 | if (extent_op->del) { |
| 2289 | list_del_init(&extent_op->list); |
| 2290 | unlock_extent(&info->extent_ins, extent_op->bytenr, |
| 2291 | extent_op->bytenr + extent_op->num_bytes |
| 2292 | - 1, GFP_NOFS); |
| 2293 | kfree(extent_op); |
| 2294 | } |
| 2295 | } |
| 2296 | mutex_unlock(&info->extent_ins_mutex); |
| 2297 | |
| 2298 | /* |
| 2299 | * still have things left on the update list, go ahead an update |
| 2300 | * everything |
| 2301 | */ |
| 2302 | if (!list_empty(&update_list)) { |
| 2303 | ret = update_backrefs(trans, extent_root, path, &update_list); |
| 2304 | BUG_ON(ret); |
| 2305 | } |
| 2306 | |
| 2307 | /* |
| 2308 | * if no inserts need to be done, but we skipped some extents and we |
| 2309 | * need to make sure everything is cleaned then reset everything and |
| 2310 | * go back to the beginning |
| 2311 | */ |
| 2312 | if (!num_inserts && all && skipped) { |
| 2313 | search = 0; |
| 2314 | skipped = 0; |
| 2315 | INIT_LIST_HEAD(&update_list); |
| 2316 | INIT_LIST_HEAD(&insert_list); |
| 2317 | goto again; |
| 2318 | } else if (!num_inserts) { |
| 2319 | goto out; |
| 2320 | } |
| 2321 | |
| 2322 | /* |
| 2323 | * process the insert extents list. Again if we are deleting this |
| 2324 | * extent, then just unlock it, pin down the bytes if need be, and be |
| 2325 | * done with it. Saves us from having to actually insert the extent |
| 2326 | * into the tree and then subsequently come along and delete it |
| 2327 | */ |
| 2328 | mutex_lock(&info->extent_ins_mutex); |
| 2329 | list_for_each_entry_safe(extent_op, tmp, &insert_list, list) { |
| 2330 | clear_extent_bits(&info->extent_ins, extent_op->bytenr, |
| 2331 | extent_op->bytenr + extent_op->num_bytes - 1, |
| 2332 | EXTENT_WRITEBACK, GFP_NOFS); |
| 2333 | if (extent_op->del) { |
Yan Zheng | 34bf63c | 2008-12-19 10:58:46 -0500 | [diff] [blame] | 2334 | u64 used; |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2335 | list_del_init(&extent_op->list); |
| 2336 | unlock_extent(&info->extent_ins, extent_op->bytenr, |
| 2337 | extent_op->bytenr + extent_op->num_bytes |
| 2338 | - 1, GFP_NOFS); |
| 2339 | |
| 2340 | mutex_lock(&extent_root->fs_info->pinned_mutex); |
| 2341 | ret = pin_down_bytes(trans, extent_root, |
| 2342 | extent_op->bytenr, |
| 2343 | extent_op->num_bytes, 0); |
| 2344 | mutex_unlock(&extent_root->fs_info->pinned_mutex); |
| 2345 | |
Yan Zheng | 34bf63c | 2008-12-19 10:58:46 -0500 | [diff] [blame] | 2346 | spin_lock(&info->delalloc_lock); |
| 2347 | used = btrfs_super_bytes_used(&info->super_copy); |
| 2348 | btrfs_set_super_bytes_used(&info->super_copy, |
| 2349 | used - extent_op->num_bytes); |
| 2350 | used = btrfs_root_used(&extent_root->root_item); |
| 2351 | btrfs_set_root_used(&extent_root->root_item, |
| 2352 | used - extent_op->num_bytes); |
| 2353 | spin_unlock(&info->delalloc_lock); |
| 2354 | |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2355 | ret = update_block_group(trans, extent_root, |
| 2356 | extent_op->bytenr, |
| 2357 | extent_op->num_bytes, |
| 2358 | 0, ret > 0); |
| 2359 | BUG_ON(ret); |
| 2360 | kfree(extent_op); |
| 2361 | num_inserts--; |
| 2362 | } |
| 2363 | } |
| 2364 | mutex_unlock(&info->extent_ins_mutex); |
| 2365 | |
| 2366 | ret = insert_extents(trans, extent_root, path, &insert_list, |
| 2367 | num_inserts); |
| 2368 | BUG_ON(ret); |
| 2369 | |
| 2370 | /* |
| 2371 | * if we broke out of the loop in order to insert stuff because we hit |
| 2372 | * the maximum number of inserts at a time we can handle, then loop |
| 2373 | * back and pick up where we left off |
| 2374 | */ |
| 2375 | if (num_inserts == max_inserts) { |
| 2376 | INIT_LIST_HEAD(&insert_list); |
| 2377 | INIT_LIST_HEAD(&update_list); |
| 2378 | num_inserts = 0; |
| 2379 | goto again; |
| 2380 | } |
| 2381 | |
| 2382 | /* |
| 2383 | * again, if we need to make absolutely sure there are no more pending |
| 2384 | * extent operations left and we know that we skipped some, go back to |
| 2385 | * the beginning and do it all again |
| 2386 | */ |
| 2387 | if (all && skipped) { |
| 2388 | INIT_LIST_HEAD(&insert_list); |
| 2389 | INIT_LIST_HEAD(&update_list); |
| 2390 | search = 0; |
| 2391 | skipped = 0; |
| 2392 | num_inserts = 0; |
| 2393 | goto again; |
| 2394 | } |
| 2395 | out: |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2396 | btrfs_free_path(path); |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 2397 | return 0; |
| 2398 | } |
| 2399 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2400 | static int pin_down_bytes(struct btrfs_trans_handle *trans, |
| 2401 | struct btrfs_root *root, |
| 2402 | u64 bytenr, u64 num_bytes, int is_data) |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 2403 | { |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 2404 | int err = 0; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2405 | struct extent_buffer *buf; |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 2406 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2407 | if (is_data) |
| 2408 | goto pinit; |
Chris Mason | 4bef084 | 2008-09-08 11:18:08 -0400 | [diff] [blame] | 2409 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2410 | buf = btrfs_find_tree_block(root, bytenr, num_bytes); |
| 2411 | if (!buf) |
| 2412 | goto pinit; |
Chris Mason | 4bef084 | 2008-09-08 11:18:08 -0400 | [diff] [blame] | 2413 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2414 | /* we can reuse a block if it hasn't been written |
| 2415 | * and it is from this transaction. We can't |
| 2416 | * reuse anything from the tree log root because |
| 2417 | * it has tiny sub-transactions. |
| 2418 | */ |
| 2419 | if (btrfs_buffer_uptodate(buf, 0) && |
| 2420 | btrfs_try_tree_lock(buf)) { |
| 2421 | u64 header_owner = btrfs_header_owner(buf); |
| 2422 | u64 header_transid = btrfs_header_generation(buf); |
| 2423 | if (header_owner != BTRFS_TREE_LOG_OBJECTID && |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 2424 | header_owner != BTRFS_TREE_RELOC_OBJECTID && |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2425 | header_transid == trans->transid && |
| 2426 | !btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) { |
| 2427 | clean_tree_block(NULL, root, buf); |
| 2428 | btrfs_tree_unlock(buf); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2429 | free_extent_buffer(buf); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2430 | return 1; |
Chris Mason | 8ef9762 | 2007-03-26 10:15:30 -0400 | [diff] [blame] | 2431 | } |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2432 | btrfs_tree_unlock(buf); |
Chris Mason | f4b9aa8 | 2007-03-27 11:05:53 -0400 | [diff] [blame] | 2433 | } |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2434 | free_extent_buffer(buf); |
| 2435 | pinit: |
| 2436 | btrfs_update_pinned_extents(root, bytenr, num_bytes, 1); |
| 2437 | |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 2438 | BUG_ON(err < 0); |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 2439 | return 0; |
| 2440 | } |
| 2441 | |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 2442 | /* |
| 2443 | * remove an extent from the root, returns 0 on success |
| 2444 | */ |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2445 | static int __free_extent(struct btrfs_trans_handle *trans, |
| 2446 | struct btrfs_root *root, |
| 2447 | u64 bytenr, u64 num_bytes, u64 parent, |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2448 | u64 root_objectid, u64 ref_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 2449 | u64 owner_objectid, int pin, int mark_free) |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 2450 | { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 2451 | struct btrfs_path *path; |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 2452 | struct btrfs_key key; |
Chris Mason | 1261ec4 | 2007-03-20 20:35:03 -0400 | [diff] [blame] | 2453 | struct btrfs_fs_info *info = root->fs_info; |
| 2454 | struct btrfs_root *extent_root = info->extent_root; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2455 | struct extent_buffer *leaf; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 2456 | int ret; |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 2457 | int extent_slot = 0; |
| 2458 | int found_extent = 0; |
| 2459 | int num_to_del = 1; |
Chris Mason | 234b63a | 2007-03-13 10:46:10 -0400 | [diff] [blame] | 2460 | struct btrfs_extent_item *ei; |
Chris Mason | cf27e1e | 2007-03-13 09:49:06 -0400 | [diff] [blame] | 2461 | u32 refs; |
Chris Mason | 037e639 | 2007-03-07 11:50:24 -0500 | [diff] [blame] | 2462 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2463 | key.objectid = bytenr; |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 2464 | btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2465 | key.offset = num_bytes; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 2466 | path = btrfs_alloc_path(); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 2467 | if (!path) |
| 2468 | return -ENOMEM; |
| 2469 | |
Chris Mason | 3c12ac7 | 2008-04-21 12:01:38 -0400 | [diff] [blame] | 2470 | path->reada = 1; |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 2471 | ret = lookup_extent_backref(trans, extent_root, path, |
| 2472 | bytenr, parent, root_objectid, |
| 2473 | ref_generation, owner_objectid, 1); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2474 | if (ret == 0) { |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 2475 | struct btrfs_key found_key; |
| 2476 | extent_slot = path->slots[0]; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2477 | while (extent_slot > 0) { |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 2478 | extent_slot--; |
| 2479 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, |
| 2480 | extent_slot); |
| 2481 | if (found_key.objectid != bytenr) |
| 2482 | break; |
| 2483 | if (found_key.type == BTRFS_EXTENT_ITEM_KEY && |
| 2484 | found_key.offset == num_bytes) { |
| 2485 | found_extent = 1; |
| 2486 | break; |
| 2487 | } |
| 2488 | if (path->slots[0] - extent_slot > 5) |
| 2489 | break; |
| 2490 | } |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2491 | if (!found_extent) { |
| 2492 | ret = remove_extent_backref(trans, extent_root, path); |
| 2493 | BUG_ON(ret); |
| 2494 | btrfs_release_path(extent_root, path); |
| 2495 | ret = btrfs_search_slot(trans, extent_root, |
| 2496 | &key, path, -1, 1); |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2497 | if (ret) { |
| 2498 | printk(KERN_ERR "umm, got %d back from search" |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2499 | ", was looking for %llu\n", ret, |
| 2500 | (unsigned long long)bytenr); |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2501 | btrfs_print_leaf(extent_root, path->nodes[0]); |
| 2502 | } |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2503 | BUG_ON(ret); |
| 2504 | extent_slot = path->slots[0]; |
| 2505 | } |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2506 | } else { |
| 2507 | btrfs_print_leaf(extent_root, path->nodes[0]); |
| 2508 | WARN_ON(1); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2509 | printk(KERN_ERR "btrfs unable to find ref byte nr %llu " |
| 2510 | "root %llu gen %llu owner %llu\n", |
| 2511 | (unsigned long long)bytenr, |
| 2512 | (unsigned long long)root_objectid, |
| 2513 | (unsigned long long)ref_generation, |
| 2514 | (unsigned long long)owner_objectid); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 2515 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2516 | |
| 2517 | leaf = path->nodes[0]; |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 2518 | ei = btrfs_item_ptr(leaf, extent_slot, |
Chris Mason | 123abc8 | 2007-03-14 14:14:43 -0400 | [diff] [blame] | 2519 | struct btrfs_extent_item); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2520 | refs = btrfs_extent_refs(leaf, ei); |
| 2521 | BUG_ON(refs == 0); |
| 2522 | refs -= 1; |
| 2523 | btrfs_set_extent_refs(leaf, ei, refs); |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 2524 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2525 | btrfs_mark_buffer_dirty(leaf); |
| 2526 | |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 2527 | if (refs == 0 && found_extent && path->slots[0] == extent_slot + 1) { |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2528 | struct btrfs_extent_ref *ref; |
| 2529 | ref = btrfs_item_ptr(leaf, path->slots[0], |
| 2530 | struct btrfs_extent_ref); |
| 2531 | BUG_ON(btrfs_ref_num_refs(leaf, ref) != 1); |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 2532 | /* if the back ref and the extent are next to each other |
| 2533 | * they get deleted below in one shot |
| 2534 | */ |
| 2535 | path->slots[0] = extent_slot; |
| 2536 | num_to_del = 2; |
| 2537 | } else if (found_extent) { |
| 2538 | /* otherwise delete the extent back ref */ |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2539 | ret = remove_extent_backref(trans, extent_root, path); |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 2540 | BUG_ON(ret); |
| 2541 | /* if refs are 0, we need to setup the path for deletion */ |
| 2542 | if (refs == 0) { |
| 2543 | btrfs_release_path(extent_root, path); |
| 2544 | ret = btrfs_search_slot(trans, extent_root, &key, path, |
| 2545 | -1, 1); |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 2546 | BUG_ON(ret); |
| 2547 | } |
| 2548 | } |
| 2549 | |
Chris Mason | cf27e1e | 2007-03-13 09:49:06 -0400 | [diff] [blame] | 2550 | if (refs == 0) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2551 | u64 super_used; |
| 2552 | u64 root_used; |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 2553 | |
| 2554 | if (pin) { |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2555 | mutex_lock(&root->fs_info->pinned_mutex); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2556 | ret = pin_down_bytes(trans, root, bytenr, num_bytes, |
| 2557 | owner_objectid >= BTRFS_FIRST_FREE_OBJECTID); |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2558 | mutex_unlock(&root->fs_info->pinned_mutex); |
Yan | c549228 | 2007-11-06 10:25:25 -0500 | [diff] [blame] | 2559 | if (ret > 0) |
| 2560 | mark_free = 1; |
| 2561 | BUG_ON(ret < 0); |
Chris Mason | 78fae27 | 2007-03-25 11:35:08 -0400 | [diff] [blame] | 2562 | } |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 2563 | /* block accounting for super block */ |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 2564 | spin_lock(&info->delalloc_lock); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2565 | super_used = btrfs_super_bytes_used(&info->super_copy); |
| 2566 | btrfs_set_super_bytes_used(&info->super_copy, |
| 2567 | super_used - num_bytes); |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 2568 | |
| 2569 | /* block accounting for root item */ |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2570 | root_used = btrfs_root_used(&root->root_item); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2571 | btrfs_set_root_used(&root->root_item, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2572 | root_used - num_bytes); |
Yan Zheng | 34bf63c | 2008-12-19 10:58:46 -0500 | [diff] [blame] | 2573 | spin_unlock(&info->delalloc_lock); |
Chris Mason | 952fcca | 2008-02-18 16:33:44 -0500 | [diff] [blame] | 2574 | ret = btrfs_del_items(trans, extent_root, path, path->slots[0], |
| 2575 | num_to_del); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2576 | BUG_ON(ret); |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2577 | btrfs_release_path(extent_root, path); |
David Woodhouse | 21af804 | 2008-08-12 14:13:26 +0100 | [diff] [blame] | 2578 | |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 2579 | if (owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { |
| 2580 | ret = btrfs_del_csums(trans, root, bytenr, num_bytes); |
| 2581 | BUG_ON(ret); |
| 2582 | } |
| 2583 | |
Chris Mason | dcbdd4d | 2008-12-16 13:51:01 -0500 | [diff] [blame] | 2584 | ret = update_block_group(trans, root, bytenr, num_bytes, 0, |
| 2585 | mark_free); |
| 2586 | BUG_ON(ret); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 2587 | } |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 2588 | btrfs_free_path(path); |
Chris Mason | 87ef2bb | 2008-10-30 11:23:27 -0400 | [diff] [blame] | 2589 | finish_current_insert(trans, extent_root, 0); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 2590 | return ret; |
| 2591 | } |
| 2592 | |
| 2593 | /* |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 2594 | * find all the blocks marked as pending in the radix tree and remove |
| 2595 | * them from the extent map |
| 2596 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2597 | static int del_pending_extents(struct btrfs_trans_handle *trans, |
| 2598 | struct btrfs_root *extent_root, int all) |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 2599 | { |
| 2600 | int ret; |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 2601 | int err = 0; |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 2602 | u64 start; |
| 2603 | u64 end; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2604 | u64 priv; |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2605 | u64 search = 0; |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2606 | int nr = 0, skipped = 0; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 2607 | struct extent_io_tree *pending_del; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2608 | struct extent_io_tree *extent_ins; |
| 2609 | struct pending_extent_op *extent_op; |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2610 | struct btrfs_fs_info *info = extent_root->fs_info; |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2611 | struct list_head delete_list; |
Chris Mason | 8ef9762 | 2007-03-26 10:15:30 -0400 | [diff] [blame] | 2612 | |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2613 | INIT_LIST_HEAD(&delete_list); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2614 | extent_ins = &extent_root->fs_info->extent_ins; |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 2615 | pending_del = &extent_root->fs_info->pending_del; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 2616 | |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2617 | again: |
| 2618 | mutex_lock(&info->extent_ins_mutex); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2619 | while (1) { |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2620 | ret = find_first_extent_bit(pending_del, search, &start, &end, |
| 2621 | EXTENT_WRITEBACK); |
| 2622 | if (ret) { |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2623 | if (all && skipped && !nr) { |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2624 | search = 0; |
Yan Zheng | 5a7be51 | 2009-01-21 10:49:16 -0500 | [diff] [blame] | 2625 | skipped = 0; |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2626 | continue; |
| 2627 | } |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2628 | mutex_unlock(&info->extent_ins_mutex); |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 2629 | break; |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2630 | } |
| 2631 | |
| 2632 | ret = try_lock_extent(extent_ins, start, end, GFP_NOFS); |
| 2633 | if (!ret) { |
| 2634 | search = end+1; |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2635 | skipped = 1; |
| 2636 | |
| 2637 | if (need_resched()) { |
| 2638 | mutex_unlock(&info->extent_ins_mutex); |
| 2639 | cond_resched(); |
| 2640 | mutex_lock(&info->extent_ins_mutex); |
| 2641 | } |
| 2642 | |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2643 | continue; |
| 2644 | } |
| 2645 | BUG_ON(ret < 0); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2646 | |
| 2647 | ret = get_state_private(pending_del, start, &priv); |
| 2648 | BUG_ON(ret); |
| 2649 | extent_op = (struct pending_extent_op *)(unsigned long)priv; |
| 2650 | |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2651 | clear_extent_bits(pending_del, start, end, EXTENT_WRITEBACK, |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 2652 | GFP_NOFS); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2653 | if (!test_range_bit(extent_ins, start, end, |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2654 | EXTENT_WRITEBACK, 0)) { |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2655 | list_add_tail(&extent_op->list, &delete_list); |
| 2656 | nr++; |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 2657 | } else { |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2658 | kfree(extent_op); |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2659 | |
| 2660 | ret = get_state_private(&info->extent_ins, start, |
| 2661 | &priv); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2662 | BUG_ON(ret); |
| 2663 | extent_op = (struct pending_extent_op *) |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2664 | (unsigned long)priv; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2665 | |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2666 | clear_extent_bits(&info->extent_ins, start, end, |
| 2667 | EXTENT_WRITEBACK, GFP_NOFS); |
| 2668 | |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2669 | if (extent_op->type == PENDING_BACKREF_UPDATE) { |
| 2670 | list_add_tail(&extent_op->list, &delete_list); |
| 2671 | search = end + 1; |
| 2672 | nr++; |
| 2673 | continue; |
| 2674 | } |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2675 | |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2676 | mutex_lock(&extent_root->fs_info->pinned_mutex); |
| 2677 | ret = pin_down_bytes(trans, extent_root, start, |
| 2678 | end + 1 - start, 0); |
| 2679 | mutex_unlock(&extent_root->fs_info->pinned_mutex); |
| 2680 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2681 | ret = update_block_group(trans, extent_root, start, |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2682 | end + 1 - start, 0, ret > 0); |
| 2683 | |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2684 | unlock_extent(extent_ins, start, end, GFP_NOFS); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2685 | BUG_ON(ret); |
| 2686 | kfree(extent_op); |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 2687 | } |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 2688 | if (ret) |
| 2689 | err = ret; |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 2690 | |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2691 | search = end + 1; |
| 2692 | |
| 2693 | if (need_resched()) { |
| 2694 | mutex_unlock(&info->extent_ins_mutex); |
| 2695 | cond_resched(); |
| 2696 | mutex_lock(&info->extent_ins_mutex); |
| 2697 | } |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 2698 | } |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2699 | |
| 2700 | if (nr) { |
| 2701 | ret = free_extents(trans, extent_root, &delete_list); |
| 2702 | BUG_ON(ret); |
| 2703 | } |
| 2704 | |
| 2705 | if (all && skipped) { |
| 2706 | INIT_LIST_HEAD(&delete_list); |
| 2707 | search = 0; |
| 2708 | nr = 0; |
| 2709 | goto again; |
| 2710 | } |
| 2711 | |
Chris Mason | e20d96d | 2007-03-22 12:13:20 -0400 | [diff] [blame] | 2712 | return err; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 2713 | } |
| 2714 | |
| 2715 | /* |
| 2716 | * remove an extent from the root, returns 0 on success |
| 2717 | */ |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2718 | static int __btrfs_free_extent(struct btrfs_trans_handle *trans, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2719 | struct btrfs_root *root, |
| 2720 | u64 bytenr, u64 num_bytes, u64 parent, |
| 2721 | u64 root_objectid, u64 ref_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 2722 | u64 owner_objectid, int pin) |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 2723 | { |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 2724 | struct btrfs_root *extent_root = root->fs_info->extent_root; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 2725 | int pending_ret; |
| 2726 | int ret; |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 2727 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2728 | WARN_ON(num_bytes < root->sectorsize); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 2729 | if (root == extent_root) { |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2730 | struct pending_extent_op *extent_op = NULL; |
| 2731 | |
| 2732 | mutex_lock(&root->fs_info->extent_ins_mutex); |
| 2733 | if (test_range_bit(&root->fs_info->extent_ins, bytenr, |
| 2734 | bytenr + num_bytes - 1, EXTENT_WRITEBACK, 0)) { |
| 2735 | u64 priv; |
| 2736 | ret = get_state_private(&root->fs_info->extent_ins, |
| 2737 | bytenr, &priv); |
| 2738 | BUG_ON(ret); |
| 2739 | extent_op = (struct pending_extent_op *) |
| 2740 | (unsigned long)priv; |
| 2741 | |
| 2742 | extent_op->del = 1; |
| 2743 | if (extent_op->type == PENDING_EXTENT_INSERT) { |
| 2744 | mutex_unlock(&root->fs_info->extent_ins_mutex); |
| 2745 | return 0; |
| 2746 | } |
| 2747 | } |
| 2748 | |
| 2749 | if (extent_op) { |
| 2750 | ref_generation = extent_op->orig_generation; |
| 2751 | parent = extent_op->orig_parent; |
| 2752 | } |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2753 | |
| 2754 | extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS); |
| 2755 | BUG_ON(!extent_op); |
| 2756 | |
| 2757 | extent_op->type = PENDING_EXTENT_DELETE; |
| 2758 | extent_op->bytenr = bytenr; |
| 2759 | extent_op->num_bytes = num_bytes; |
| 2760 | extent_op->parent = parent; |
| 2761 | extent_op->orig_parent = parent; |
| 2762 | extent_op->generation = ref_generation; |
| 2763 | extent_op->orig_generation = ref_generation; |
| 2764 | extent_op->level = (int)owner_objectid; |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 2765 | INIT_LIST_HEAD(&extent_op->list); |
| 2766 | extent_op->del = 0; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2767 | |
| 2768 | set_extent_bits(&root->fs_info->pending_del, |
| 2769 | bytenr, bytenr + num_bytes - 1, |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2770 | EXTENT_WRITEBACK, GFP_NOFS); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2771 | set_state_private(&root->fs_info->pending_del, |
| 2772 | bytenr, (unsigned long)extent_op); |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2773 | mutex_unlock(&root->fs_info->extent_ins_mutex); |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 2774 | return 0; |
| 2775 | } |
Chris Mason | 4bef084 | 2008-09-08 11:18:08 -0400 | [diff] [blame] | 2776 | /* if metadata always pin */ |
Chris Mason | d00aff0 | 2008-09-11 15:54:42 -0400 | [diff] [blame] | 2777 | if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID) { |
| 2778 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2779 | mutex_lock(&root->fs_info->pinned_mutex); |
| 2780 | btrfs_update_pinned_extents(root, bytenr, num_bytes, 1); |
| 2781 | mutex_unlock(&root->fs_info->pinned_mutex); |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 2782 | update_reserved_extents(root, bytenr, num_bytes, 0); |
Chris Mason | d00aff0 | 2008-09-11 15:54:42 -0400 | [diff] [blame] | 2783 | return 0; |
| 2784 | } |
Chris Mason | 4bef084 | 2008-09-08 11:18:08 -0400 | [diff] [blame] | 2785 | pin = 1; |
Chris Mason | d00aff0 | 2008-09-11 15:54:42 -0400 | [diff] [blame] | 2786 | } |
Chris Mason | 4bef084 | 2008-09-08 11:18:08 -0400 | [diff] [blame] | 2787 | |
| 2788 | /* if data pin when any transaction has committed this */ |
| 2789 | if (ref_generation != trans->transid) |
| 2790 | pin = 1; |
| 2791 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2792 | ret = __free_extent(trans, root, bytenr, num_bytes, parent, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 2793 | root_objectid, ref_generation, |
| 2794 | owner_objectid, pin, pin == 0); |
Chris Mason | ee6e650 | 2008-07-17 12:54:40 -0400 | [diff] [blame] | 2795 | |
Chris Mason | 87ef2bb | 2008-10-30 11:23:27 -0400 | [diff] [blame] | 2796 | finish_current_insert(trans, root->fs_info->extent_root, 0); |
| 2797 | pending_ret = del_pending_extents(trans, root->fs_info->extent_root, 0); |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 2798 | return ret ? ret : pending_ret; |
| 2799 | } |
| 2800 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2801 | int btrfs_free_extent(struct btrfs_trans_handle *trans, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2802 | struct btrfs_root *root, |
| 2803 | u64 bytenr, u64 num_bytes, u64 parent, |
| 2804 | u64 root_objectid, u64 ref_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 2805 | u64 owner_objectid, int pin) |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2806 | { |
| 2807 | int ret; |
| 2808 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2809 | ret = __btrfs_free_extent(trans, root, bytenr, num_bytes, parent, |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2810 | root_objectid, ref_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 2811 | owner_objectid, pin); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2812 | return ret; |
| 2813 | } |
| 2814 | |
Chris Mason | 87ee04e | 2007-11-30 11:30:34 -0500 | [diff] [blame] | 2815 | static u64 stripe_align(struct btrfs_root *root, u64 val) |
| 2816 | { |
| 2817 | u64 mask = ((u64)root->stripesize - 1); |
| 2818 | u64 ret = (val + mask) & ~mask; |
| 2819 | return ret; |
| 2820 | } |
| 2821 | |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 2822 | /* |
| 2823 | * walks the btree of allocated extents and find a hole of a given size. |
| 2824 | * The key ins is changed to record the hole: |
| 2825 | * ins->objectid == block start |
Chris Mason | 62e2749 | 2007-03-15 12:56:47 -0400 | [diff] [blame] | 2826 | * ins->flags = BTRFS_EXTENT_ITEM_KEY |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 2827 | * ins->offset == number of blocks |
| 2828 | * Any available blocks before search_start are skipped. |
| 2829 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2830 | static noinline int find_free_extent(struct btrfs_trans_handle *trans, |
Chris Mason | 98ed517 | 2008-01-03 10:01:48 -0500 | [diff] [blame] | 2831 | struct btrfs_root *orig_root, |
| 2832 | u64 num_bytes, u64 empty_size, |
| 2833 | u64 search_start, u64 search_end, |
| 2834 | u64 hint_byte, struct btrfs_key *ins, |
| 2835 | u64 exclude_start, u64 exclude_nr, |
| 2836 | int data) |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 2837 | { |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2838 | int ret = 0; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2839 | struct btrfs_root *root = orig_root->fs_info->extent_root; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2840 | u64 total_needed = num_bytes; |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 2841 | u64 *last_ptr = NULL; |
Chris Mason | 4366211 | 2008-11-07 09:06:11 -0500 | [diff] [blame] | 2842 | u64 last_wanted = 0; |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2843 | struct btrfs_block_group_cache *block_group = NULL; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 2844 | int chunk_alloc_done = 0; |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 2845 | int empty_cluster = 2 * 1024 * 1024; |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 2846 | int allowed_chunk_alloc = 0; |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2847 | struct list_head *head = NULL, *cur = NULL; |
| 2848 | int loop = 0; |
Chris Mason | f5a31e1 | 2008-11-10 11:47:09 -0500 | [diff] [blame] | 2849 | int extra_loop = 0; |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2850 | struct btrfs_space_info *space_info; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 2851 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2852 | WARN_ON(num_bytes < root->sectorsize); |
Chris Mason | b1a4d96 | 2007-04-04 15:27:52 -0400 | [diff] [blame] | 2853 | btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY); |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2854 | ins->objectid = 0; |
| 2855 | ins->offset = 0; |
Chris Mason | b1a4d96 | 2007-04-04 15:27:52 -0400 | [diff] [blame] | 2856 | |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 2857 | if (orig_root->ref_cows || empty_size) |
| 2858 | allowed_chunk_alloc = 1; |
| 2859 | |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 2860 | if (data & BTRFS_BLOCK_GROUP_METADATA) { |
| 2861 | last_ptr = &root->fs_info->last_alloc; |
Chris Mason | 4366211 | 2008-11-07 09:06:11 -0500 | [diff] [blame] | 2862 | empty_cluster = 64 * 1024; |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 2863 | } |
| 2864 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2865 | if ((data & BTRFS_BLOCK_GROUP_DATA) && btrfs_test_opt(root, SSD)) |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 2866 | last_ptr = &root->fs_info->last_data_alloc; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2867 | |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 2868 | if (last_ptr) { |
Chris Mason | 4366211 | 2008-11-07 09:06:11 -0500 | [diff] [blame] | 2869 | if (*last_ptr) { |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 2870 | hint_byte = *last_ptr; |
Chris Mason | 4366211 | 2008-11-07 09:06:11 -0500 | [diff] [blame] | 2871 | last_wanted = *last_ptr; |
| 2872 | } else |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 2873 | empty_size += empty_cluster; |
Chris Mason | 4366211 | 2008-11-07 09:06:11 -0500 | [diff] [blame] | 2874 | } else { |
| 2875 | empty_cluster = 0; |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 2876 | } |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 2877 | search_start = max(search_start, first_logical_byte(root, 0)); |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 2878 | search_start = max(search_start, hint_byte); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2879 | |
Chris Mason | 42e70e7 | 2008-11-07 18:17:11 -0500 | [diff] [blame] | 2880 | if (last_wanted && search_start != last_wanted) { |
Chris Mason | 4366211 | 2008-11-07 09:06:11 -0500 | [diff] [blame] | 2881 | last_wanted = 0; |
Chris Mason | 42e70e7 | 2008-11-07 18:17:11 -0500 | [diff] [blame] | 2882 | empty_size += empty_cluster; |
| 2883 | } |
Chris Mason | 4366211 | 2008-11-07 09:06:11 -0500 | [diff] [blame] | 2884 | |
Chris Mason | 42e70e7 | 2008-11-07 18:17:11 -0500 | [diff] [blame] | 2885 | total_needed += empty_size; |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2886 | block_group = btrfs_lookup_block_group(root->fs_info, search_start); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 2887 | if (!block_group) |
| 2888 | block_group = btrfs_lookup_first_block_group(root->fs_info, |
| 2889 | search_start); |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2890 | space_info = __find_space_info(root->fs_info, data); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2891 | |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2892 | down_read(&space_info->groups_sem); |
| 2893 | while (1) { |
| 2894 | struct btrfs_free_space *free_space; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2895 | /* |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2896 | * the only way this happens if our hint points to a block |
| 2897 | * group thats not of the proper type, while looping this |
| 2898 | * should never happen |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2899 | */ |
Chris Mason | 8a1413a | 2008-11-10 16:13:54 -0500 | [diff] [blame] | 2900 | if (empty_size) |
| 2901 | extra_loop = 1; |
| 2902 | |
Chris Mason | 42e70e7 | 2008-11-07 18:17:11 -0500 | [diff] [blame] | 2903 | if (!block_group) |
| 2904 | goto new_group_no_lock; |
| 2905 | |
Josef Bacik | ea6a478 | 2008-11-20 12:16:16 -0500 | [diff] [blame] | 2906 | if (unlikely(!block_group->cached)) { |
| 2907 | mutex_lock(&block_group->cache_mutex); |
| 2908 | ret = cache_block_group(root, block_group); |
| 2909 | mutex_unlock(&block_group->cache_mutex); |
| 2910 | if (ret) |
| 2911 | break; |
| 2912 | } |
| 2913 | |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2914 | mutex_lock(&block_group->alloc_mutex); |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2915 | if (unlikely(!block_group_bits(block_group, data))) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2916 | goto new_group; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2917 | |
Josef Bacik | ea6a478 | 2008-11-20 12:16:16 -0500 | [diff] [blame] | 2918 | if (unlikely(block_group->ro)) |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2919 | goto new_group; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2920 | |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2921 | free_space = btrfs_find_free_space(block_group, search_start, |
| 2922 | total_needed); |
| 2923 | if (free_space) { |
| 2924 | u64 start = block_group->key.objectid; |
| 2925 | u64 end = block_group->key.objectid + |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2926 | block_group->key.offset; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2927 | |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2928 | search_start = stripe_align(root, free_space->offset); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2929 | |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2930 | /* move on to the next group */ |
| 2931 | if (search_start + num_bytes >= search_end) |
| 2932 | goto new_group; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 2933 | |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2934 | /* move on to the next group */ |
| 2935 | if (search_start + num_bytes > end) |
| 2936 | goto new_group; |
| 2937 | |
Chris Mason | 4366211 | 2008-11-07 09:06:11 -0500 | [diff] [blame] | 2938 | if (last_wanted && search_start != last_wanted) { |
Chris Mason | 3b7885b | 2008-11-06 21:48:27 -0500 | [diff] [blame] | 2939 | total_needed += empty_cluster; |
Chris Mason | 8a1413a | 2008-11-10 16:13:54 -0500 | [diff] [blame] | 2940 | empty_size += empty_cluster; |
Chris Mason | 4366211 | 2008-11-07 09:06:11 -0500 | [diff] [blame] | 2941 | last_wanted = 0; |
Chris Mason | 3b7885b | 2008-11-06 21:48:27 -0500 | [diff] [blame] | 2942 | /* |
| 2943 | * if search_start is still in this block group |
| 2944 | * then we just re-search this block group |
| 2945 | */ |
| 2946 | if (search_start >= start && |
| 2947 | search_start < end) { |
| 2948 | mutex_unlock(&block_group->alloc_mutex); |
| 2949 | continue; |
| 2950 | } |
| 2951 | |
| 2952 | /* else we go to the next block group */ |
| 2953 | goto new_group; |
| 2954 | } |
| 2955 | |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2956 | if (exclude_nr > 0 && |
| 2957 | (search_start + num_bytes > exclude_start && |
| 2958 | search_start < exclude_start + exclude_nr)) { |
| 2959 | search_start = exclude_start + exclude_nr; |
| 2960 | /* |
| 2961 | * if search_start is still in this block group |
| 2962 | * then we just re-search this block group |
| 2963 | */ |
| 2964 | if (search_start >= start && |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2965 | search_start < end) { |
| 2966 | mutex_unlock(&block_group->alloc_mutex); |
Chris Mason | 4366211 | 2008-11-07 09:06:11 -0500 | [diff] [blame] | 2967 | last_wanted = 0; |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2968 | continue; |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2969 | } |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2970 | |
| 2971 | /* else we go to the next block group */ |
| 2972 | goto new_group; |
| 2973 | } |
| 2974 | |
| 2975 | ins->objectid = search_start; |
| 2976 | ins->offset = num_bytes; |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2977 | |
| 2978 | btrfs_remove_free_space_lock(block_group, search_start, |
| 2979 | num_bytes); |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2980 | /* we are all good, lets return */ |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2981 | mutex_unlock(&block_group->alloc_mutex); |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2982 | break; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2983 | } |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2984 | new_group: |
Chris Mason | 42e70e7 | 2008-11-07 18:17:11 -0500 | [diff] [blame] | 2985 | mutex_unlock(&block_group->alloc_mutex); |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 2986 | put_block_group(block_group); |
| 2987 | block_group = NULL; |
Chris Mason | 42e70e7 | 2008-11-07 18:17:11 -0500 | [diff] [blame] | 2988 | new_group_no_lock: |
Chris Mason | f5a31e1 | 2008-11-10 11:47:09 -0500 | [diff] [blame] | 2989 | /* don't try to compare new allocations against the |
| 2990 | * last allocation any more |
| 2991 | */ |
Chris Mason | 4366211 | 2008-11-07 09:06:11 -0500 | [diff] [blame] | 2992 | last_wanted = 0; |
Chris Mason | f5a31e1 | 2008-11-10 11:47:09 -0500 | [diff] [blame] | 2993 | |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2994 | /* |
| 2995 | * Here's how this works. |
| 2996 | * loop == 0: we were searching a block group via a hint |
| 2997 | * and didn't find anything, so we start at |
| 2998 | * the head of the block groups and keep searching |
| 2999 | * loop == 1: we're searching through all of the block groups |
| 3000 | * if we hit the head again we have searched |
| 3001 | * all of the block groups for this space and we |
| 3002 | * need to try and allocate, if we cant error out. |
| 3003 | * loop == 2: we allocated more space and are looping through |
| 3004 | * all of the block groups again. |
| 3005 | */ |
| 3006 | if (loop == 0) { |
| 3007 | head = &space_info->block_groups; |
| 3008 | cur = head->next; |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3009 | loop++; |
| 3010 | } else if (loop == 1 && cur == head) { |
Chris Mason | f5a31e1 | 2008-11-10 11:47:09 -0500 | [diff] [blame] | 3011 | int keep_going; |
Chris Mason | 42e70e7 | 2008-11-07 18:17:11 -0500 | [diff] [blame] | 3012 | |
Chris Mason | f5a31e1 | 2008-11-10 11:47:09 -0500 | [diff] [blame] | 3013 | /* at this point we give up on the empty_size |
| 3014 | * allocations and just try to allocate the min |
| 3015 | * space. |
| 3016 | * |
| 3017 | * The extra_loop field was set if an empty_size |
| 3018 | * allocation was attempted above, and if this |
| 3019 | * is try we need to try the loop again without |
| 3020 | * the additional empty_size. |
| 3021 | */ |
Chris Mason | 5b7c3fc | 2008-11-10 07:26:33 -0500 | [diff] [blame] | 3022 | total_needed -= empty_size; |
| 3023 | empty_size = 0; |
Chris Mason | f5a31e1 | 2008-11-10 11:47:09 -0500 | [diff] [blame] | 3024 | keep_going = extra_loop; |
| 3025 | loop++; |
Chris Mason | 42e70e7 | 2008-11-07 18:17:11 -0500 | [diff] [blame] | 3026 | |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3027 | if (allowed_chunk_alloc && !chunk_alloc_done) { |
| 3028 | up_read(&space_info->groups_sem); |
| 3029 | ret = do_chunk_alloc(trans, root, num_bytes + |
| 3030 | 2 * 1024 * 1024, data, 1); |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3031 | down_read(&space_info->groups_sem); |
Chris Mason | 2ed6d66 | 2008-11-13 09:59:33 -0500 | [diff] [blame] | 3032 | if (ret < 0) |
| 3033 | goto loop_check; |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3034 | head = &space_info->block_groups; |
Chris Mason | f5a31e1 | 2008-11-10 11:47:09 -0500 | [diff] [blame] | 3035 | /* |
| 3036 | * we've allocated a new chunk, keep |
| 3037 | * trying |
| 3038 | */ |
| 3039 | keep_going = 1; |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3040 | chunk_alloc_done = 1; |
| 3041 | } else if (!allowed_chunk_alloc) { |
| 3042 | space_info->force_alloc = 1; |
Chris Mason | f5a31e1 | 2008-11-10 11:47:09 -0500 | [diff] [blame] | 3043 | } |
Chris Mason | 2ed6d66 | 2008-11-13 09:59:33 -0500 | [diff] [blame] | 3044 | loop_check: |
Chris Mason | f5a31e1 | 2008-11-10 11:47:09 -0500 | [diff] [blame] | 3045 | if (keep_going) { |
| 3046 | cur = head->next; |
| 3047 | extra_loop = 0; |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3048 | } else { |
| 3049 | break; |
| 3050 | } |
| 3051 | } else if (cur == head) { |
| 3052 | break; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 3053 | } |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3054 | |
| 3055 | block_group = list_entry(cur, struct btrfs_block_group_cache, |
| 3056 | list); |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 3057 | atomic_inc(&block_group->count); |
| 3058 | |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3059 | search_start = block_group->key.objectid; |
| 3060 | cur = cur->next; |
Chris Mason | e19caa5 | 2007-10-15 16:17:44 -0400 | [diff] [blame] | 3061 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3062 | |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3063 | /* we found what we needed */ |
| 3064 | if (ins->objectid) { |
| 3065 | if (!(data & BTRFS_BLOCK_GROUP_DATA)) |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 3066 | trans->block_group = block_group->key.objectid; |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3067 | |
| 3068 | if (last_ptr) |
| 3069 | *last_ptr = ins->objectid + ins->offset; |
| 3070 | ret = 0; |
| 3071 | } else if (!ret) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3072 | printk(KERN_ERR "btrfs searching for %llu bytes, " |
| 3073 | "num_bytes %llu, loop %d, allowed_alloc %d\n", |
| 3074 | (unsigned long long)total_needed, |
| 3075 | (unsigned long long)num_bytes, |
Josef Bacik | 4ce4cb5 | 2008-11-17 21:12:00 -0500 | [diff] [blame] | 3076 | loop, allowed_chunk_alloc); |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3077 | ret = -ENOSPC; |
Chris Mason | f2654de | 2007-06-26 12:20:46 -0400 | [diff] [blame] | 3078 | } |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 3079 | if (block_group) |
| 3080 | put_block_group(block_group); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3081 | |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3082 | up_read(&space_info->groups_sem); |
Chris Mason | 0f70abe | 2007-02-28 16:46:22 -0500 | [diff] [blame] | 3083 | return ret; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 3084 | } |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 3085 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 3086 | static void dump_space_info(struct btrfs_space_info *info, u64 bytes) |
| 3087 | { |
| 3088 | struct btrfs_block_group_cache *cache; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 3089 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3090 | printk(KERN_INFO "space_info has %llu free, is %sfull\n", |
| 3091 | (unsigned long long)(info->total_bytes - info->bytes_used - |
| 3092 | info->bytes_pinned - info->bytes_reserved), |
| 3093 | (info->full) ? "" : "not "); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 3094 | |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3095 | down_read(&info->groups_sem); |
Qinghuang Feng | c6e3087 | 2009-01-21 10:59:08 -0500 | [diff] [blame] | 3096 | list_for_each_entry(cache, &info->block_groups, list) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 3097 | spin_lock(&cache->lock); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3098 | printk(KERN_INFO "block group %llu has %llu bytes, %llu used " |
| 3099 | "%llu pinned %llu reserved\n", |
| 3100 | (unsigned long long)cache->key.objectid, |
| 3101 | (unsigned long long)cache->key.offset, |
| 3102 | (unsigned long long)btrfs_block_group_used(&cache->item), |
| 3103 | (unsigned long long)cache->pinned, |
| 3104 | (unsigned long long)cache->reserved); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 3105 | btrfs_dump_free_space(cache, bytes); |
| 3106 | spin_unlock(&cache->lock); |
| 3107 | } |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3108 | up_read(&info->groups_sem); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 3109 | } |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 3110 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3111 | static int __btrfs_reserve_extent(struct btrfs_trans_handle *trans, |
| 3112 | struct btrfs_root *root, |
| 3113 | u64 num_bytes, u64 min_alloc_size, |
| 3114 | u64 empty_size, u64 hint_byte, |
| 3115 | u64 search_end, struct btrfs_key *ins, |
| 3116 | u64 data) |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 3117 | { |
| 3118 | int ret; |
Chris Mason | fbdc762 | 2007-05-30 10:22:12 -0400 | [diff] [blame] | 3119 | u64 search_start = 0; |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 3120 | u64 alloc_profile; |
Chris Mason | 1261ec4 | 2007-03-20 20:35:03 -0400 | [diff] [blame] | 3121 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 3122 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 3123 | if (data) { |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 3124 | alloc_profile = info->avail_data_alloc_bits & |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3125 | info->data_alloc_profile; |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 3126 | data = BTRFS_BLOCK_GROUP_DATA | alloc_profile; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 3127 | } else if (root == root->fs_info->chunk_root) { |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 3128 | alloc_profile = info->avail_system_alloc_bits & |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3129 | info->system_alloc_profile; |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 3130 | data = BTRFS_BLOCK_GROUP_SYSTEM | alloc_profile; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 3131 | } else { |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 3132 | alloc_profile = info->avail_metadata_alloc_bits & |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3133 | info->metadata_alloc_profile; |
Chris Mason | 8790d50 | 2008-04-03 16:29:03 -0400 | [diff] [blame] | 3134 | data = BTRFS_BLOCK_GROUP_METADATA | alloc_profile; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 3135 | } |
Chris Mason | 98d20f6 | 2008-04-14 09:46:10 -0400 | [diff] [blame] | 3136 | again: |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 3137 | data = btrfs_reduce_alloc_profile(root, data); |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 3138 | /* |
| 3139 | * the only place that sets empty_size is btrfs_realloc_node, which |
| 3140 | * is not called recursively on allocations |
| 3141 | */ |
| 3142 | if (empty_size || root->ref_cows) { |
Chris Mason | 593060d | 2008-03-25 16:50:33 -0400 | [diff] [blame] | 3143 | if (!(data & BTRFS_BLOCK_GROUP_METADATA)) { |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 3144 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 3145 | 2 * 1024 * 1024, |
| 3146 | BTRFS_BLOCK_GROUP_METADATA | |
| 3147 | (info->metadata_alloc_profile & |
| 3148 | info->avail_metadata_alloc_bits), 0); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 3149 | } |
| 3150 | ret = do_chunk_alloc(trans, root->fs_info->extent_root, |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 3151 | num_bytes + 2 * 1024 * 1024, data, 0); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 3152 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 3153 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3154 | WARN_ON(num_bytes < root->sectorsize); |
| 3155 | ret = find_free_extent(trans, root, num_bytes, empty_size, |
| 3156 | search_start, search_end, hint_byte, ins, |
Chris Mason | 26b8003 | 2007-08-08 20:17:12 -0400 | [diff] [blame] | 3157 | trans->alloc_exclude_start, |
| 3158 | trans->alloc_exclude_nr, data); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 3159 | |
Chris Mason | 98d20f6 | 2008-04-14 09:46:10 -0400 | [diff] [blame] | 3160 | if (ret == -ENOSPC && num_bytes > min_alloc_size) { |
| 3161 | num_bytes = num_bytes >> 1; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 3162 | num_bytes = num_bytes & ~(root->sectorsize - 1); |
Chris Mason | 98d20f6 | 2008-04-14 09:46:10 -0400 | [diff] [blame] | 3163 | num_bytes = max(num_bytes, min_alloc_size); |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 3164 | do_chunk_alloc(trans, root->fs_info->extent_root, |
| 3165 | num_bytes, data, 1); |
Chris Mason | 98d20f6 | 2008-04-14 09:46:10 -0400 | [diff] [blame] | 3166 | goto again; |
| 3167 | } |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 3168 | if (ret) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 3169 | struct btrfs_space_info *sinfo; |
| 3170 | |
| 3171 | sinfo = __find_space_info(root->fs_info, data); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3172 | printk(KERN_ERR "btrfs allocation failed flags %llu, " |
| 3173 | "wanted %llu\n", (unsigned long long)data, |
| 3174 | (unsigned long long)num_bytes); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 3175 | dump_space_info(sinfo, num_bytes); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 3176 | BUG(); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 3177 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 3178 | |
| 3179 | return ret; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3180 | } |
| 3181 | |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 3182 | int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len) |
| 3183 | { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 3184 | struct btrfs_block_group_cache *cache; |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 3185 | int ret = 0; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 3186 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 3187 | cache = btrfs_lookup_block_group(root->fs_info, start); |
| 3188 | if (!cache) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3189 | printk(KERN_ERR "Unable to find block group for %llu\n", |
| 3190 | (unsigned long long)start); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 3191 | return -ENOSPC; |
| 3192 | } |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 3193 | |
| 3194 | ret = btrfs_discard_extent(root, start, len); |
| 3195 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 3196 | btrfs_add_free_space(cache, start, len); |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 3197 | put_block_group(cache); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 3198 | update_reserved_extents(root, start, len, 0); |
Liu Hui | 1f3c79a | 2009-01-05 15:57:51 -0500 | [diff] [blame] | 3199 | |
| 3200 | return ret; |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 3201 | } |
| 3202 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3203 | int btrfs_reserve_extent(struct btrfs_trans_handle *trans, |
| 3204 | struct btrfs_root *root, |
| 3205 | u64 num_bytes, u64 min_alloc_size, |
| 3206 | u64 empty_size, u64 hint_byte, |
| 3207 | u64 search_end, struct btrfs_key *ins, |
| 3208 | u64 data) |
| 3209 | { |
| 3210 | int ret; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3211 | ret = __btrfs_reserve_extent(trans, root, num_bytes, min_alloc_size, |
| 3212 | empty_size, hint_byte, search_end, ins, |
| 3213 | data); |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 3214 | update_reserved_extents(root, ins->objectid, ins->offset, 1); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3215 | return ret; |
| 3216 | } |
| 3217 | |
| 3218 | static int __btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3219 | struct btrfs_root *root, u64 parent, |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3220 | u64 root_objectid, u64 ref_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 3221 | u64 owner, struct btrfs_key *ins) |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3222 | { |
| 3223 | int ret; |
| 3224 | int pending_ret; |
| 3225 | u64 super_used; |
| 3226 | u64 root_used; |
| 3227 | u64 num_bytes = ins->offset; |
| 3228 | u32 sizes[2]; |
| 3229 | struct btrfs_fs_info *info = root->fs_info; |
| 3230 | struct btrfs_root *extent_root = info->extent_root; |
| 3231 | struct btrfs_extent_item *extent_item; |
| 3232 | struct btrfs_extent_ref *ref; |
| 3233 | struct btrfs_path *path; |
| 3234 | struct btrfs_key keys[2]; |
Chris Mason | f2654de | 2007-06-26 12:20:46 -0400 | [diff] [blame] | 3235 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3236 | if (parent == 0) |
| 3237 | parent = ins->objectid; |
| 3238 | |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 3239 | /* block accounting for super block */ |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 3240 | spin_lock(&info->delalloc_lock); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3241 | super_used = btrfs_super_bytes_used(&info->super_copy); |
| 3242 | btrfs_set_super_bytes_used(&info->super_copy, super_used + num_bytes); |
Chris Mason | 26b8003 | 2007-08-08 20:17:12 -0400 | [diff] [blame] | 3243 | |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 3244 | /* block accounting for root item */ |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3245 | root_used = btrfs_root_used(&root->root_item); |
| 3246 | btrfs_set_root_used(&root->root_item, root_used + num_bytes); |
Yan Zheng | 34bf63c | 2008-12-19 10:58:46 -0500 | [diff] [blame] | 3247 | spin_unlock(&info->delalloc_lock); |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 3248 | |
Chris Mason | 26b8003 | 2007-08-08 20:17:12 -0400 | [diff] [blame] | 3249 | if (root == extent_root) { |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3250 | struct pending_extent_op *extent_op; |
| 3251 | |
| 3252 | extent_op = kmalloc(sizeof(*extent_op), GFP_NOFS); |
| 3253 | BUG_ON(!extent_op); |
| 3254 | |
| 3255 | extent_op->type = PENDING_EXTENT_INSERT; |
| 3256 | extent_op->bytenr = ins->objectid; |
| 3257 | extent_op->num_bytes = ins->offset; |
| 3258 | extent_op->parent = parent; |
| 3259 | extent_op->orig_parent = 0; |
| 3260 | extent_op->generation = ref_generation; |
| 3261 | extent_op->orig_generation = 0; |
| 3262 | extent_op->level = (int)owner; |
Josef Bacik | f3465ca | 2008-11-12 14:19:50 -0500 | [diff] [blame] | 3263 | INIT_LIST_HEAD(&extent_op->list); |
| 3264 | extent_op->del = 0; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3265 | |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3266 | mutex_lock(&root->fs_info->extent_ins_mutex); |
Chris Mason | 1a5bc16 | 2007-10-15 16:15:26 -0400 | [diff] [blame] | 3267 | set_extent_bits(&root->fs_info->extent_ins, ins->objectid, |
| 3268 | ins->objectid + ins->offset - 1, |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3269 | EXTENT_WRITEBACK, GFP_NOFS); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3270 | set_state_private(&root->fs_info->extent_ins, |
| 3271 | ins->objectid, (unsigned long)extent_op); |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3272 | mutex_unlock(&root->fs_info->extent_ins_mutex); |
Chris Mason | 26b8003 | 2007-08-08 20:17:12 -0400 | [diff] [blame] | 3273 | goto update_block; |
| 3274 | } |
| 3275 | |
Chris Mason | 47e4bb9 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 3276 | memcpy(&keys[0], ins, sizeof(*ins)); |
Chris Mason | 47e4bb9 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 3277 | keys[1].objectid = ins->objectid; |
| 3278 | keys[1].type = BTRFS_EXTENT_REF_KEY; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3279 | keys[1].offset = parent; |
Chris Mason | 47e4bb9 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 3280 | sizes[0] = sizeof(*extent_item); |
| 3281 | sizes[1] = sizeof(*ref); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 3282 | |
| 3283 | path = btrfs_alloc_path(); |
| 3284 | BUG_ON(!path); |
Chris Mason | 47e4bb9 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 3285 | |
| 3286 | ret = btrfs_insert_empty_items(trans, extent_root, path, keys, |
| 3287 | sizes, 2); |
Chris Mason | ccd467d | 2007-06-28 15:57:36 -0400 | [diff] [blame] | 3288 | BUG_ON(ret); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 3289 | |
Chris Mason | 47e4bb9 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 3290 | extent_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
| 3291 | struct btrfs_extent_item); |
| 3292 | btrfs_set_extent_refs(path->nodes[0], extent_item, 1); |
| 3293 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1, |
| 3294 | struct btrfs_extent_ref); |
| 3295 | |
| 3296 | btrfs_set_ref_root(path->nodes[0], ref, root_objectid); |
| 3297 | btrfs_set_ref_generation(path->nodes[0], ref, ref_generation); |
| 3298 | btrfs_set_ref_objectid(path->nodes[0], ref, owner); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3299 | btrfs_set_ref_num_refs(path->nodes[0], ref, 1); |
Chris Mason | 47e4bb9 | 2008-02-01 14:51:59 -0500 | [diff] [blame] | 3300 | |
| 3301 | btrfs_mark_buffer_dirty(path->nodes[0]); |
| 3302 | |
| 3303 | trans->alloc_exclude_start = 0; |
| 3304 | trans->alloc_exclude_nr = 0; |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 3305 | btrfs_free_path(path); |
Chris Mason | 87ef2bb | 2008-10-30 11:23:27 -0400 | [diff] [blame] | 3306 | finish_current_insert(trans, extent_root, 0); |
| 3307 | pending_ret = del_pending_extents(trans, extent_root, 0); |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 3308 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 3309 | if (ret) |
| 3310 | goto out; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 3311 | if (pending_ret) { |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 3312 | ret = pending_ret; |
| 3313 | goto out; |
Chris Mason | e37c9e6 | 2007-05-09 20:13:14 -0400 | [diff] [blame] | 3314 | } |
Chris Mason | 26b8003 | 2007-08-08 20:17:12 -0400 | [diff] [blame] | 3315 | |
| 3316 | update_block: |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3317 | ret = update_block_group(trans, root, ins->objectid, |
| 3318 | ins->offset, 1, 0); |
Chris Mason | f594706 | 2008-02-04 10:10:13 -0500 | [diff] [blame] | 3319 | if (ret) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3320 | printk(KERN_ERR "btrfs update block group failed for %llu " |
| 3321 | "%llu\n", (unsigned long long)ins->objectid, |
| 3322 | (unsigned long long)ins->offset); |
Chris Mason | f594706 | 2008-02-04 10:10:13 -0500 | [diff] [blame] | 3323 | BUG(); |
| 3324 | } |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 3325 | out: |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3326 | return ret; |
| 3327 | } |
| 3328 | |
| 3329 | int btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3330 | struct btrfs_root *root, u64 parent, |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3331 | u64 root_objectid, u64 ref_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 3332 | u64 owner, struct btrfs_key *ins) |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3333 | { |
| 3334 | int ret; |
Chris Mason | 1c2308f | 2008-09-23 13:14:13 -0400 | [diff] [blame] | 3335 | |
| 3336 | if (root_objectid == BTRFS_TREE_LOG_OBJECTID) |
| 3337 | return 0; |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 3338 | ret = __btrfs_alloc_reserved_extent(trans, root, parent, root_objectid, |
| 3339 | ref_generation, owner, ins); |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 3340 | update_reserved_extents(root, ins->objectid, ins->offset, 0); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3341 | return ret; |
| 3342 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3343 | |
| 3344 | /* |
| 3345 | * this is used by the tree logging recovery code. It records that |
| 3346 | * an extent has been allocated and makes sure to clear the free |
| 3347 | * space cache bits as well |
| 3348 | */ |
| 3349 | int btrfs_alloc_logged_extent(struct btrfs_trans_handle *trans, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3350 | struct btrfs_root *root, u64 parent, |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3351 | u64 root_objectid, u64 ref_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 3352 | u64 owner, struct btrfs_key *ins) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3353 | { |
| 3354 | int ret; |
| 3355 | struct btrfs_block_group_cache *block_group; |
| 3356 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3357 | block_group = btrfs_lookup_block_group(root->fs_info, ins->objectid); |
Josef Bacik | ea6a478 | 2008-11-20 12:16:16 -0500 | [diff] [blame] | 3358 | mutex_lock(&block_group->cache_mutex); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3359 | cache_block_group(root, block_group); |
Josef Bacik | ea6a478 | 2008-11-20 12:16:16 -0500 | [diff] [blame] | 3360 | mutex_unlock(&block_group->cache_mutex); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3361 | |
Josef Bacik | ea6a478 | 2008-11-20 12:16:16 -0500 | [diff] [blame] | 3362 | ret = btrfs_remove_free_space(block_group, ins->objectid, |
| 3363 | ins->offset); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 3364 | BUG_ON(ret); |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 3365 | put_block_group(block_group); |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 3366 | ret = __btrfs_alloc_reserved_extent(trans, root, parent, root_objectid, |
| 3367 | ref_generation, owner, ins); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3368 | return ret; |
| 3369 | } |
| 3370 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3371 | /* |
| 3372 | * finds a free extent and does all the dirty work required for allocation |
| 3373 | * returns the key for the extent through ins, and a tree buffer for |
| 3374 | * the first block of the extent through buf. |
| 3375 | * |
| 3376 | * returns 0 if everything worked, non-zero otherwise. |
| 3377 | */ |
| 3378 | int btrfs_alloc_extent(struct btrfs_trans_handle *trans, |
| 3379 | struct btrfs_root *root, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3380 | u64 num_bytes, u64 parent, u64 min_alloc_size, |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3381 | u64 root_objectid, u64 ref_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 3382 | u64 owner_objectid, u64 empty_size, u64 hint_byte, |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3383 | u64 search_end, struct btrfs_key *ins, u64 data) |
| 3384 | { |
| 3385 | int ret; |
| 3386 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3387 | ret = __btrfs_reserve_extent(trans, root, num_bytes, |
| 3388 | min_alloc_size, empty_size, hint_byte, |
| 3389 | search_end, ins, data); |
| 3390 | BUG_ON(ret); |
Chris Mason | d00aff0 | 2008-09-11 15:54:42 -0400 | [diff] [blame] | 3391 | if (root_objectid != BTRFS_TREE_LOG_OBJECTID) { |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3392 | ret = __btrfs_alloc_reserved_extent(trans, root, parent, |
| 3393 | root_objectid, ref_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 3394 | owner_objectid, ins); |
Chris Mason | d00aff0 | 2008-09-11 15:54:42 -0400 | [diff] [blame] | 3395 | BUG_ON(ret); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3396 | |
Zheng Yan | e856981 | 2008-09-26 10:05:48 -0400 | [diff] [blame] | 3397 | } else { |
| 3398 | update_reserved_extents(root, ins->objectid, ins->offset, 1); |
Chris Mason | d00aff0 | 2008-09-11 15:54:42 -0400 | [diff] [blame] | 3399 | } |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 3400 | return ret; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 3401 | } |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 3402 | |
| 3403 | struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans, |
| 3404 | struct btrfs_root *root, |
| 3405 | u64 bytenr, u32 blocksize) |
| 3406 | { |
| 3407 | struct extent_buffer *buf; |
| 3408 | |
| 3409 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); |
| 3410 | if (!buf) |
| 3411 | return ERR_PTR(-ENOMEM); |
| 3412 | btrfs_set_header_generation(buf, trans->transid); |
| 3413 | btrfs_tree_lock(buf); |
| 3414 | clean_tree_block(trans, root, buf); |
Chris Mason | b4ce94d | 2009-02-04 09:25:08 -0500 | [diff] [blame] | 3415 | |
| 3416 | btrfs_set_lock_blocking(buf); |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 3417 | btrfs_set_buffer_uptodate(buf); |
Chris Mason | b4ce94d | 2009-02-04 09:25:08 -0500 | [diff] [blame] | 3418 | |
Chris Mason | d0c803c | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 3419 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { |
| 3420 | set_extent_dirty(&root->dirty_log_pages, buf->start, |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 3421 | buf->start + buf->len - 1, GFP_NOFS); |
Chris Mason | d0c803c | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 3422 | } else { |
| 3423 | set_extent_dirty(&trans->transaction->dirty_pages, buf->start, |
| 3424 | buf->start + buf->len - 1, GFP_NOFS); |
| 3425 | } |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 3426 | trans->blocks_used++; |
Chris Mason | b4ce94d | 2009-02-04 09:25:08 -0500 | [diff] [blame] | 3427 | /* this returns a buffer locked for blocking */ |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 3428 | return buf; |
| 3429 | } |
| 3430 | |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 3431 | /* |
| 3432 | * helper function to allocate a block for a given tree |
| 3433 | * returns the tree buffer or NULL. |
| 3434 | */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3435 | struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3436 | struct btrfs_root *root, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3437 | u32 blocksize, u64 parent, |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 3438 | u64 root_objectid, |
| 3439 | u64 ref_generation, |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 3440 | int level, |
| 3441 | u64 hint, |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3442 | u64 empty_size) |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 3443 | { |
Chris Mason | e2fa722 | 2007-03-12 16:22:34 -0400 | [diff] [blame] | 3444 | struct btrfs_key ins; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 3445 | int ret; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3446 | struct extent_buffer *buf; |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 3447 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3448 | ret = btrfs_alloc_extent(trans, root, blocksize, parent, blocksize, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 3449 | root_objectid, ref_generation, level, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3450 | empty_size, hint, (u64)-1, &ins, 0); |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 3451 | if (ret) { |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 3452 | BUG_ON(ret > 0); |
| 3453 | return ERR_PTR(ret); |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 3454 | } |
Chris Mason | 55c6907 | 2008-01-09 15:55:33 -0500 | [diff] [blame] | 3455 | |
Chris Mason | 65b51a0 | 2008-08-01 15:11:20 -0400 | [diff] [blame] | 3456 | buf = btrfs_init_new_buffer(trans, root, ins.objectid, blocksize); |
Chris Mason | fec577f | 2007-02-26 10:40:21 -0500 | [diff] [blame] | 3457 | return buf; |
| 3458 | } |
Chris Mason | a28ec19 | 2007-03-06 20:08:01 -0500 | [diff] [blame] | 3459 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3460 | int btrfs_drop_leaf_ref(struct btrfs_trans_handle *trans, |
| 3461 | struct btrfs_root *root, struct extent_buffer *leaf) |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 3462 | { |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 3463 | u64 leaf_owner; |
| 3464 | u64 leaf_generation; |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3465 | struct refsort *sorted; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3466 | struct btrfs_key key; |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 3467 | struct btrfs_file_extent_item *fi; |
| 3468 | int i; |
| 3469 | int nritems; |
| 3470 | int ret; |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3471 | int refi = 0; |
| 3472 | int slot; |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 3473 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3474 | BUG_ON(!btrfs_is_leaf(leaf)); |
| 3475 | nritems = btrfs_header_nritems(leaf); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 3476 | leaf_owner = btrfs_header_owner(leaf); |
| 3477 | leaf_generation = btrfs_header_generation(leaf); |
| 3478 | |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3479 | sorted = kmalloc(sizeof(*sorted) * nritems, GFP_NOFS); |
| 3480 | /* we do this loop twice. The first time we build a list |
| 3481 | * of the extents we have a reference on, then we sort the list |
| 3482 | * by bytenr. The second time around we actually do the |
| 3483 | * extent freeing. |
| 3484 | */ |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 3485 | for (i = 0; i < nritems; i++) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3486 | u64 disk_bytenr; |
Chris Mason | e34a5b4 | 2008-07-22 12:08:37 -0400 | [diff] [blame] | 3487 | cond_resched(); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3488 | |
| 3489 | btrfs_item_key_to_cpu(leaf, &key, i); |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3490 | |
| 3491 | /* only extents have references, skip everything else */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3492 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 3493 | continue; |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3494 | |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 3495 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3496 | |
| 3497 | /* inline extents live in the btree, they don't have refs */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3498 | if (btrfs_file_extent_type(leaf, fi) == |
| 3499 | BTRFS_FILE_EXTENT_INLINE) |
Chris Mason | 236454df | 2007-04-19 13:37:44 -0400 | [diff] [blame] | 3500 | continue; |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3501 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3502 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3503 | |
| 3504 | /* holes don't have refs */ |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3505 | if (disk_bytenr == 0) |
Chris Mason | 3a68637 | 2007-05-24 13:35:57 -0400 | [diff] [blame] | 3506 | continue; |
Chris Mason | 4a09675 | 2008-07-21 10:29:44 -0400 | [diff] [blame] | 3507 | |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3508 | sorted[refi].bytenr = disk_bytenr; |
| 3509 | sorted[refi].slot = i; |
| 3510 | refi++; |
| 3511 | } |
| 3512 | |
| 3513 | if (refi == 0) |
| 3514 | goto out; |
| 3515 | |
| 3516 | sort(sorted, refi, sizeof(struct refsort), refsort_cmp, NULL); |
| 3517 | |
| 3518 | for (i = 0; i < refi; i++) { |
| 3519 | u64 disk_bytenr; |
| 3520 | |
| 3521 | disk_bytenr = sorted[i].bytenr; |
| 3522 | slot = sorted[i].slot; |
| 3523 | |
| 3524 | cond_resched(); |
| 3525 | |
| 3526 | btrfs_item_key_to_cpu(leaf, &key, slot); |
| 3527 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) |
| 3528 | continue; |
| 3529 | |
| 3530 | fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); |
| 3531 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 3532 | ret = __btrfs_free_extent(trans, root, disk_bytenr, |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 3533 | btrfs_file_extent_disk_num_bytes(leaf, fi), |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3534 | leaf->start, leaf_owner, leaf_generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 3535 | key.objectid, 0); |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3536 | BUG_ON(ret); |
Chris Mason | 2dd3e67 | 2008-08-04 08:20:15 -0400 | [diff] [blame] | 3537 | |
| 3538 | atomic_inc(&root->fs_info->throttle_gen); |
| 3539 | wake_up(&root->fs_info->transaction_throttle); |
| 3540 | cond_resched(); |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 3541 | } |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3542 | out: |
| 3543 | kfree(sorted); |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 3544 | return 0; |
| 3545 | } |
| 3546 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3547 | static noinline int cache_drop_leaf_ref(struct btrfs_trans_handle *trans, |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3548 | struct btrfs_root *root, |
| 3549 | struct btrfs_leaf_ref *ref) |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 3550 | { |
| 3551 | int i; |
| 3552 | int ret; |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3553 | struct btrfs_extent_info *info; |
| 3554 | struct refsort *sorted; |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 3555 | |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3556 | if (ref->nritems == 0) |
| 3557 | return 0; |
| 3558 | |
| 3559 | sorted = kmalloc(sizeof(*sorted) * ref->nritems, GFP_NOFS); |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 3560 | for (i = 0; i < ref->nritems; i++) { |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3561 | sorted[i].bytenr = ref->extents[i].bytenr; |
| 3562 | sorted[i].slot = i; |
| 3563 | } |
| 3564 | sort(sorted, ref->nritems, sizeof(struct refsort), refsort_cmp, NULL); |
| 3565 | |
| 3566 | /* |
| 3567 | * the items in the ref were sorted when the ref was inserted |
| 3568 | * into the ref cache, so this is already in order |
| 3569 | */ |
| 3570 | for (i = 0; i < ref->nritems; i++) { |
| 3571 | info = ref->extents + sorted[i].slot; |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3572 | ret = __btrfs_free_extent(trans, root, info->bytenr, |
| 3573 | info->num_bytes, ref->bytenr, |
| 3574 | ref->owner, ref->generation, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 3575 | info->objectid, 0); |
Chris Mason | 2dd3e67 | 2008-08-04 08:20:15 -0400 | [diff] [blame] | 3576 | |
| 3577 | atomic_inc(&root->fs_info->throttle_gen); |
| 3578 | wake_up(&root->fs_info->transaction_throttle); |
| 3579 | cond_resched(); |
| 3580 | |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 3581 | BUG_ON(ret); |
| 3582 | info++; |
| 3583 | } |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 3584 | |
Chris Mason | 806638b | 2009-02-05 09:08:14 -0500 | [diff] [blame] | 3585 | kfree(sorted); |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 3586 | return 0; |
| 3587 | } |
| 3588 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3589 | static int drop_snap_lookup_refcount(struct btrfs_root *root, u64 start, |
| 3590 | u64 len, u32 *refs) |
Chris Mason | 333db94 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 3591 | { |
Chris Mason | 017e536 | 2008-07-28 15:32:51 -0400 | [diff] [blame] | 3592 | int ret; |
Chris Mason | f87f057 | 2008-08-01 11:27:23 -0400 | [diff] [blame] | 3593 | |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3594 | ret = btrfs_lookup_extent_ref(NULL, root, start, len, refs); |
Chris Mason | f87f057 | 2008-08-01 11:27:23 -0400 | [diff] [blame] | 3595 | BUG_ON(ret); |
| 3596 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3597 | #if 0 /* some debugging code in case we see problems here */ |
Chris Mason | f87f057 | 2008-08-01 11:27:23 -0400 | [diff] [blame] | 3598 | /* if the refs count is one, it won't get increased again. But |
| 3599 | * if the ref count is > 1, someone may be decreasing it at |
| 3600 | * the same time we are. |
| 3601 | */ |
| 3602 | if (*refs != 1) { |
| 3603 | struct extent_buffer *eb = NULL; |
| 3604 | eb = btrfs_find_create_tree_block(root, start, len); |
| 3605 | if (eb) |
| 3606 | btrfs_tree_lock(eb); |
| 3607 | |
| 3608 | mutex_lock(&root->fs_info->alloc_mutex); |
| 3609 | ret = lookup_extent_ref(NULL, root, start, len, refs); |
| 3610 | BUG_ON(ret); |
| 3611 | mutex_unlock(&root->fs_info->alloc_mutex); |
| 3612 | |
| 3613 | if (eb) { |
| 3614 | btrfs_tree_unlock(eb); |
| 3615 | free_extent_buffer(eb); |
| 3616 | } |
| 3617 | if (*refs == 1) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3618 | printk(KERN_ERR "btrfs block %llu went down to one " |
| 3619 | "during drop_snap\n", (unsigned long long)start); |
Chris Mason | f87f057 | 2008-08-01 11:27:23 -0400 | [diff] [blame] | 3620 | } |
| 3621 | |
| 3622 | } |
| 3623 | #endif |
| 3624 | |
Chris Mason | e7a8456 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 3625 | cond_resched(); |
Chris Mason | 017e536 | 2008-07-28 15:32:51 -0400 | [diff] [blame] | 3626 | return ret; |
Chris Mason | 333db94 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 3627 | } |
| 3628 | |
| 3629 | /* |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3630 | * this is used while deleting old snapshots, and it drops the refs |
| 3631 | * on a whole subtree starting from a level 1 node. |
| 3632 | * |
| 3633 | * The idea is to sort all the leaf pointers, and then drop the |
| 3634 | * ref on all the leaves in order. Most of the time the leaves |
| 3635 | * will have ref cache entries, so no leaf IOs will be required to |
| 3636 | * find the extents they have references on. |
| 3637 | * |
| 3638 | * For each leaf, any references it has are also dropped in order |
| 3639 | * |
| 3640 | * This ends up dropping the references in something close to optimal |
| 3641 | * order for reading and modifying the extent allocation tree. |
| 3642 | */ |
| 3643 | static noinline int drop_level_one_refs(struct btrfs_trans_handle *trans, |
| 3644 | struct btrfs_root *root, |
| 3645 | struct btrfs_path *path) |
| 3646 | { |
| 3647 | u64 bytenr; |
| 3648 | u64 root_owner; |
| 3649 | u64 root_gen; |
| 3650 | struct extent_buffer *eb = path->nodes[1]; |
| 3651 | struct extent_buffer *leaf; |
| 3652 | struct btrfs_leaf_ref *ref; |
| 3653 | struct refsort *sorted = NULL; |
| 3654 | int nritems = btrfs_header_nritems(eb); |
| 3655 | int ret; |
| 3656 | int i; |
| 3657 | int refi = 0; |
| 3658 | int slot = path->slots[1]; |
| 3659 | u32 blocksize = btrfs_level_size(root, 0); |
| 3660 | u32 refs; |
| 3661 | |
| 3662 | if (nritems == 0) |
| 3663 | goto out; |
| 3664 | |
| 3665 | root_owner = btrfs_header_owner(eb); |
| 3666 | root_gen = btrfs_header_generation(eb); |
| 3667 | sorted = kmalloc(sizeof(*sorted) * nritems, GFP_NOFS); |
| 3668 | |
| 3669 | /* |
| 3670 | * step one, sort all the leaf pointers so we don't scribble |
| 3671 | * randomly into the extent allocation tree |
| 3672 | */ |
| 3673 | for (i = slot; i < nritems; i++) { |
| 3674 | sorted[refi].bytenr = btrfs_node_blockptr(eb, i); |
| 3675 | sorted[refi].slot = i; |
| 3676 | refi++; |
| 3677 | } |
| 3678 | |
| 3679 | /* |
| 3680 | * nritems won't be zero, but if we're picking up drop_snapshot |
| 3681 | * after a crash, slot might be > 0, so double check things |
| 3682 | * just in case. |
| 3683 | */ |
| 3684 | if (refi == 0) |
| 3685 | goto out; |
| 3686 | |
| 3687 | sort(sorted, refi, sizeof(struct refsort), refsort_cmp, NULL); |
| 3688 | |
| 3689 | /* |
| 3690 | * the first loop frees everything the leaves point to |
| 3691 | */ |
| 3692 | for (i = 0; i < refi; i++) { |
| 3693 | u64 ptr_gen; |
| 3694 | |
| 3695 | bytenr = sorted[i].bytenr; |
| 3696 | |
| 3697 | /* |
| 3698 | * check the reference count on this leaf. If it is > 1 |
| 3699 | * we just decrement it below and don't update any |
| 3700 | * of the refs the leaf points to. |
| 3701 | */ |
| 3702 | ret = drop_snap_lookup_refcount(root, bytenr, blocksize, &refs); |
| 3703 | BUG_ON(ret); |
| 3704 | if (refs != 1) |
| 3705 | continue; |
| 3706 | |
| 3707 | ptr_gen = btrfs_node_ptr_generation(eb, sorted[i].slot); |
| 3708 | |
| 3709 | /* |
| 3710 | * the leaf only had one reference, which means the |
| 3711 | * only thing pointing to this leaf is the snapshot |
| 3712 | * we're deleting. It isn't possible for the reference |
| 3713 | * count to increase again later |
| 3714 | * |
| 3715 | * The reference cache is checked for the leaf, |
| 3716 | * and if found we'll be able to drop any refs held by |
| 3717 | * the leaf without needing to read it in. |
| 3718 | */ |
| 3719 | ref = btrfs_lookup_leaf_ref(root, bytenr); |
| 3720 | if (ref && ref->generation != ptr_gen) { |
| 3721 | btrfs_free_leaf_ref(root, ref); |
| 3722 | ref = NULL; |
| 3723 | } |
| 3724 | if (ref) { |
| 3725 | ret = cache_drop_leaf_ref(trans, root, ref); |
| 3726 | BUG_ON(ret); |
| 3727 | btrfs_remove_leaf_ref(root, ref); |
| 3728 | btrfs_free_leaf_ref(root, ref); |
| 3729 | } else { |
| 3730 | /* |
| 3731 | * the leaf wasn't in the reference cache, so |
| 3732 | * we have to read it. |
| 3733 | */ |
| 3734 | leaf = read_tree_block(root, bytenr, blocksize, |
| 3735 | ptr_gen); |
| 3736 | ret = btrfs_drop_leaf_ref(trans, root, leaf); |
| 3737 | BUG_ON(ret); |
| 3738 | free_extent_buffer(leaf); |
| 3739 | } |
| 3740 | atomic_inc(&root->fs_info->throttle_gen); |
| 3741 | wake_up(&root->fs_info->transaction_throttle); |
| 3742 | cond_resched(); |
| 3743 | } |
| 3744 | |
| 3745 | /* |
| 3746 | * run through the loop again to free the refs on the leaves. |
| 3747 | * This is faster than doing it in the loop above because |
| 3748 | * the leaves are likely to be clustered together. We end up |
| 3749 | * working in nice chunks on the extent allocation tree. |
| 3750 | */ |
| 3751 | for (i = 0; i < refi; i++) { |
| 3752 | bytenr = sorted[i].bytenr; |
| 3753 | ret = __btrfs_free_extent(trans, root, bytenr, |
| 3754 | blocksize, eb->start, |
| 3755 | root_owner, root_gen, 0, 1); |
| 3756 | BUG_ON(ret); |
| 3757 | |
| 3758 | atomic_inc(&root->fs_info->throttle_gen); |
| 3759 | wake_up(&root->fs_info->transaction_throttle); |
| 3760 | cond_resched(); |
| 3761 | } |
| 3762 | out: |
| 3763 | kfree(sorted); |
| 3764 | |
| 3765 | /* |
| 3766 | * update the path to show we've processed the entire level 1 |
| 3767 | * node. This will get saved into the root's drop_snapshot_progress |
| 3768 | * field so these drops are not repeated again if this transaction |
| 3769 | * commits. |
| 3770 | */ |
| 3771 | path->slots[1] = nritems; |
| 3772 | return 0; |
| 3773 | } |
| 3774 | |
| 3775 | /* |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 3776 | * helper function for drop_snapshot, this walks down the tree dropping ref |
| 3777 | * counts as it goes. |
| 3778 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3779 | static noinline int walk_down_tree(struct btrfs_trans_handle *trans, |
Chris Mason | 98ed517 | 2008-01-03 10:01:48 -0500 | [diff] [blame] | 3780 | struct btrfs_root *root, |
| 3781 | struct btrfs_path *path, int *level) |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3782 | { |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 3783 | u64 root_owner; |
| 3784 | u64 root_gen; |
| 3785 | u64 bytenr; |
Chris Mason | ca7a79a | 2008-05-12 12:59:19 -0400 | [diff] [blame] | 3786 | u64 ptr_gen; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3787 | struct extent_buffer *next; |
| 3788 | struct extent_buffer *cur; |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 3789 | struct extent_buffer *parent; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3790 | u32 blocksize; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3791 | int ret; |
| 3792 | u32 refs; |
| 3793 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 3794 | WARN_ON(*level < 0); |
| 3795 | WARN_ON(*level >= BTRFS_MAX_LEVEL); |
Chris Mason | 333db94 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 3796 | ret = drop_snap_lookup_refcount(root, path->nodes[*level]->start, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3797 | path->nodes[*level]->len, &refs); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3798 | BUG_ON(ret); |
| 3799 | if (refs > 1) |
| 3800 | goto out; |
Chris Mason | e011599 | 2007-06-19 16:23:05 -0400 | [diff] [blame] | 3801 | |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 3802 | /* |
| 3803 | * walk down to the last node level and free all the leaves |
| 3804 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3805 | while (*level >= 0) { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 3806 | WARN_ON(*level < 0); |
| 3807 | WARN_ON(*level >= BTRFS_MAX_LEVEL); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3808 | cur = path->nodes[*level]; |
Chris Mason | e011599 | 2007-06-19 16:23:05 -0400 | [diff] [blame] | 3809 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3810 | if (btrfs_header_level(cur) != *level) |
Chris Mason | 2c90e5d | 2007-04-02 10:50:19 -0400 | [diff] [blame] | 3811 | WARN_ON(1); |
Chris Mason | e011599 | 2007-06-19 16:23:05 -0400 | [diff] [blame] | 3812 | |
Chris Mason | 7518a23 | 2007-03-12 12:01:18 -0400 | [diff] [blame] | 3813 | if (path->slots[*level] >= |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3814 | btrfs_header_nritems(cur)) |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3815 | break; |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3816 | |
| 3817 | /* the new code goes down to level 1 and does all the |
| 3818 | * leaves pointed to that node in bulk. So, this check |
| 3819 | * for level 0 will always be false. |
| 3820 | * |
| 3821 | * But, the disk format allows the drop_snapshot_progress |
| 3822 | * field in the root to leave things in a state where |
| 3823 | * a leaf will need cleaning up here. If someone crashes |
| 3824 | * with the old code and then boots with the new code, |
| 3825 | * we might find a leaf here. |
| 3826 | */ |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 3827 | if (*level == 0) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3828 | ret = btrfs_drop_leaf_ref(trans, root, cur); |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 3829 | BUG_ON(ret); |
| 3830 | break; |
| 3831 | } |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3832 | |
| 3833 | /* |
| 3834 | * once we get to level one, process the whole node |
| 3835 | * at once, including everything below it. |
| 3836 | */ |
| 3837 | if (*level == 1) { |
| 3838 | ret = drop_level_one_refs(trans, root, path); |
| 3839 | BUG_ON(ret); |
| 3840 | break; |
| 3841 | } |
| 3842 | |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3843 | bytenr = btrfs_node_blockptr(cur, path->slots[*level]); |
Chris Mason | ca7a79a | 2008-05-12 12:59:19 -0400 | [diff] [blame] | 3844 | ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3845 | blocksize = btrfs_level_size(root, *level - 1); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 3846 | |
Chris Mason | 333db94 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 3847 | ret = drop_snap_lookup_refcount(root, bytenr, blocksize, &refs); |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 3848 | BUG_ON(ret); |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3849 | |
| 3850 | /* |
| 3851 | * if there is more than one reference, we don't need |
| 3852 | * to read that node to drop any references it has. We |
| 3853 | * just drop the ref we hold on that node and move on to the |
| 3854 | * next slot in this level. |
| 3855 | */ |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 3856 | if (refs != 1) { |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 3857 | parent = path->nodes[*level]; |
| 3858 | root_owner = btrfs_header_owner(parent); |
| 3859 | root_gen = btrfs_header_generation(parent); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3860 | path->slots[*level]++; |
Chris Mason | f87f057 | 2008-08-01 11:27:23 -0400 | [diff] [blame] | 3861 | |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 3862 | ret = __btrfs_free_extent(trans, root, bytenr, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3863 | blocksize, parent->start, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 3864 | root_owner, root_gen, |
| 3865 | *level - 1, 1); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3866 | BUG_ON(ret); |
Chris Mason | 18e35e0a | 2008-08-01 13:11:41 -0400 | [diff] [blame] | 3867 | |
| 3868 | atomic_inc(&root->fs_info->throttle_gen); |
| 3869 | wake_up(&root->fs_info->transaction_throttle); |
Chris Mason | 2dd3e67 | 2008-08-04 08:20:15 -0400 | [diff] [blame] | 3870 | cond_resched(); |
Chris Mason | 18e35e0a | 2008-08-01 13:11:41 -0400 | [diff] [blame] | 3871 | |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3872 | continue; |
| 3873 | } |
Chris Mason | 333db94 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 3874 | |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3875 | /* |
| 3876 | * we need to keep freeing things in the next level down. |
| 3877 | * read the block and loop around to process it |
| 3878 | */ |
| 3879 | next = read_tree_block(root, bytenr, blocksize, ptr_gen); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 3880 | WARN_ON(*level <= 0); |
Chris Mason | 83e15a2 | 2007-03-12 09:03:27 -0400 | [diff] [blame] | 3881 | if (path->nodes[*level-1]) |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3882 | free_extent_buffer(path->nodes[*level-1]); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3883 | path->nodes[*level-1] = next; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3884 | *level = btrfs_header_level(next); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3885 | path->slots[*level] = 0; |
Chris Mason | 2dd3e67 | 2008-08-04 08:20:15 -0400 | [diff] [blame] | 3886 | cond_resched(); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3887 | } |
| 3888 | out: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 3889 | WARN_ON(*level < 0); |
| 3890 | WARN_ON(*level >= BTRFS_MAX_LEVEL); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 3891 | |
| 3892 | if (path->nodes[*level] == root->node) { |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 3893 | parent = path->nodes[*level]; |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 3894 | bytenr = path->nodes[*level]->start; |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 3895 | } else { |
| 3896 | parent = path->nodes[*level + 1]; |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 3897 | bytenr = btrfs_node_blockptr(parent, path->slots[*level + 1]); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 3898 | } |
| 3899 | |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 3900 | blocksize = btrfs_level_size(root, *level); |
| 3901 | root_owner = btrfs_header_owner(parent); |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 3902 | root_gen = btrfs_header_generation(parent); |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 3903 | |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3904 | /* |
| 3905 | * cleanup and free the reference on the last node |
| 3906 | * we processed |
| 3907 | */ |
Yan Zheng | 31153d8 | 2008-07-28 15:32:19 -0400 | [diff] [blame] | 3908 | ret = __btrfs_free_extent(trans, root, bytenr, blocksize, |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 3909 | parent->start, root_owner, root_gen, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 3910 | *level, 1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3911 | free_extent_buffer(path->nodes[*level]); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3912 | path->nodes[*level] = NULL; |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 3913 | |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3914 | *level += 1; |
| 3915 | BUG_ON(ret); |
Chris Mason | f87f057 | 2008-08-01 11:27:23 -0400 | [diff] [blame] | 3916 | |
Chris Mason | e7a8456 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 3917 | cond_resched(); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 3918 | return 0; |
| 3919 | } |
| 3920 | |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 3921 | /* |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3922 | * helper function for drop_subtree, this function is similar to |
| 3923 | * walk_down_tree. The main difference is that it checks reference |
| 3924 | * counts while tree blocks are locked. |
| 3925 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3926 | static noinline int walk_down_subtree(struct btrfs_trans_handle *trans, |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3927 | struct btrfs_root *root, |
| 3928 | struct btrfs_path *path, int *level) |
| 3929 | { |
| 3930 | struct extent_buffer *next; |
| 3931 | struct extent_buffer *cur; |
| 3932 | struct extent_buffer *parent; |
| 3933 | u64 bytenr; |
| 3934 | u64 ptr_gen; |
| 3935 | u32 blocksize; |
| 3936 | u32 refs; |
| 3937 | int ret; |
| 3938 | |
| 3939 | cur = path->nodes[*level]; |
| 3940 | ret = btrfs_lookup_extent_ref(trans, root, cur->start, cur->len, |
| 3941 | &refs); |
| 3942 | BUG_ON(ret); |
| 3943 | if (refs > 1) |
| 3944 | goto out; |
| 3945 | |
| 3946 | while (*level >= 0) { |
| 3947 | cur = path->nodes[*level]; |
| 3948 | if (*level == 0) { |
| 3949 | ret = btrfs_drop_leaf_ref(trans, root, cur); |
| 3950 | BUG_ON(ret); |
| 3951 | clean_tree_block(trans, root, cur); |
| 3952 | break; |
| 3953 | } |
| 3954 | if (path->slots[*level] >= btrfs_header_nritems(cur)) { |
| 3955 | clean_tree_block(trans, root, cur); |
| 3956 | break; |
| 3957 | } |
| 3958 | |
| 3959 | bytenr = btrfs_node_blockptr(cur, path->slots[*level]); |
| 3960 | blocksize = btrfs_level_size(root, *level - 1); |
| 3961 | ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]); |
| 3962 | |
| 3963 | next = read_tree_block(root, bytenr, blocksize, ptr_gen); |
| 3964 | btrfs_tree_lock(next); |
Chris Mason | b4ce94d | 2009-02-04 09:25:08 -0500 | [diff] [blame] | 3965 | btrfs_set_lock_blocking(next); |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 3966 | |
| 3967 | ret = btrfs_lookup_extent_ref(trans, root, bytenr, blocksize, |
| 3968 | &refs); |
| 3969 | BUG_ON(ret); |
| 3970 | if (refs > 1) { |
| 3971 | parent = path->nodes[*level]; |
| 3972 | ret = btrfs_free_extent(trans, root, bytenr, |
| 3973 | blocksize, parent->start, |
| 3974 | btrfs_header_owner(parent), |
| 3975 | btrfs_header_generation(parent), |
| 3976 | *level - 1, 1); |
| 3977 | BUG_ON(ret); |
| 3978 | path->slots[*level]++; |
| 3979 | btrfs_tree_unlock(next); |
| 3980 | free_extent_buffer(next); |
| 3981 | continue; |
| 3982 | } |
| 3983 | |
| 3984 | *level = btrfs_header_level(next); |
| 3985 | path->nodes[*level] = next; |
| 3986 | path->slots[*level] = 0; |
| 3987 | path->locks[*level] = 1; |
| 3988 | cond_resched(); |
| 3989 | } |
| 3990 | out: |
| 3991 | parent = path->nodes[*level + 1]; |
| 3992 | bytenr = path->nodes[*level]->start; |
| 3993 | blocksize = path->nodes[*level]->len; |
| 3994 | |
| 3995 | ret = btrfs_free_extent(trans, root, bytenr, blocksize, |
| 3996 | parent->start, btrfs_header_owner(parent), |
| 3997 | btrfs_header_generation(parent), *level, 1); |
| 3998 | BUG_ON(ret); |
| 3999 | |
| 4000 | if (path->locks[*level]) { |
| 4001 | btrfs_tree_unlock(path->nodes[*level]); |
| 4002 | path->locks[*level] = 0; |
| 4003 | } |
| 4004 | free_extent_buffer(path->nodes[*level]); |
| 4005 | path->nodes[*level] = NULL; |
| 4006 | *level += 1; |
| 4007 | cond_resched(); |
| 4008 | return 0; |
| 4009 | } |
| 4010 | |
| 4011 | /* |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 4012 | * helper for dropping snapshots. This walks back up the tree in the path |
| 4013 | * to find the first node higher up where we haven't yet gone through |
| 4014 | * all the slots |
| 4015 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4016 | static noinline int walk_up_tree(struct btrfs_trans_handle *trans, |
Chris Mason | 98ed517 | 2008-01-03 10:01:48 -0500 | [diff] [blame] | 4017 | struct btrfs_root *root, |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 4018 | struct btrfs_path *path, |
| 4019 | int *level, int max_level) |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 4020 | { |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 4021 | u64 root_owner; |
| 4022 | u64 root_gen; |
| 4023 | struct btrfs_root_item *root_item = &root->root_item; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 4024 | int i; |
| 4025 | int slot; |
| 4026 | int ret; |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 4027 | |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 4028 | for (i = *level; i < max_level && path->nodes[i]; i++) { |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 4029 | slot = path->slots[i]; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4030 | if (slot < btrfs_header_nritems(path->nodes[i]) - 1) { |
| 4031 | struct extent_buffer *node; |
| 4032 | struct btrfs_disk_key disk_key; |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 4033 | |
| 4034 | /* |
| 4035 | * there is more work to do in this level. |
| 4036 | * Update the drop_progress marker to reflect |
| 4037 | * the work we've done so far, and then bump |
| 4038 | * the slot number |
| 4039 | */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4040 | node = path->nodes[i]; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 4041 | path->slots[i]++; |
| 4042 | *level = i; |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 4043 | WARN_ON(*level == 0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4044 | btrfs_node_key(node, &disk_key, path->slots[i]); |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 4045 | memcpy(&root_item->drop_progress, |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4046 | &disk_key, sizeof(disk_key)); |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 4047 | root_item->drop_level = i; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 4048 | return 0; |
| 4049 | } else { |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 4050 | struct extent_buffer *parent; |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 4051 | |
| 4052 | /* |
| 4053 | * this whole node is done, free our reference |
| 4054 | * on it and go up one level |
| 4055 | */ |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 4056 | if (path->nodes[*level] == root->node) |
| 4057 | parent = path->nodes[*level]; |
| 4058 | else |
| 4059 | parent = path->nodes[*level + 1]; |
| 4060 | |
| 4061 | root_owner = btrfs_header_owner(parent); |
| 4062 | root_gen = btrfs_header_generation(parent); |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 4063 | |
| 4064 | clean_tree_block(trans, root, path->nodes[*level]); |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 4065 | ret = btrfs_free_extent(trans, root, |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 4066 | path->nodes[*level]->start, |
Chris Mason | 7bb8631 | 2007-12-11 09:25:06 -0500 | [diff] [blame] | 4067 | path->nodes[*level]->len, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 4068 | parent->start, root_owner, |
| 4069 | root_gen, *level, 1); |
Chris Mason | 6407bf6 | 2007-03-27 06:33:00 -0400 | [diff] [blame] | 4070 | BUG_ON(ret); |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 4071 | if (path->locks[*level]) { |
| 4072 | btrfs_tree_unlock(path->nodes[*level]); |
| 4073 | path->locks[*level] = 0; |
| 4074 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4075 | free_extent_buffer(path->nodes[*level]); |
Chris Mason | 83e15a2 | 2007-03-12 09:03:27 -0400 | [diff] [blame] | 4076 | path->nodes[*level] = NULL; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 4077 | *level = i + 1; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 4078 | } |
| 4079 | } |
| 4080 | return 1; |
| 4081 | } |
| 4082 | |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 4083 | /* |
| 4084 | * drop the reference count on the tree rooted at 'snap'. This traverses |
| 4085 | * the tree freeing any blocks that have a ref count of zero after being |
| 4086 | * decremented. |
| 4087 | */ |
Chris Mason | e089f05 | 2007-03-16 16:20:31 -0400 | [diff] [blame] | 4088 | int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 4089 | *root) |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 4090 | { |
Chris Mason | 3768f36 | 2007-03-13 16:47:54 -0400 | [diff] [blame] | 4091 | int ret = 0; |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 4092 | int wret; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 4093 | int level; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 4094 | struct btrfs_path *path; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 4095 | int i; |
| 4096 | int orig_level; |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 4097 | struct btrfs_root_item *root_item = &root->root_item; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 4098 | |
Chris Mason | a213501 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 4099 | WARN_ON(!mutex_is_locked(&root->fs_info->drop_mutex)); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 4100 | path = btrfs_alloc_path(); |
| 4101 | BUG_ON(!path); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 4102 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4103 | level = btrfs_header_level(root->node); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 4104 | orig_level = level; |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 4105 | if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) { |
| 4106 | path->nodes[level] = root->node; |
Chris Mason | f510cfe | 2007-10-15 16:14:48 -0400 | [diff] [blame] | 4107 | extent_buffer_get(root->node); |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 4108 | path->slots[level] = 0; |
| 4109 | } else { |
| 4110 | struct btrfs_key key; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4111 | struct btrfs_disk_key found_key; |
| 4112 | struct extent_buffer *node; |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 4113 | |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 4114 | btrfs_disk_key_to_cpu(&key, &root_item->drop_progress); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 4115 | level = root_item->drop_level; |
| 4116 | path->lowest_level = level; |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 4117 | wret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
Chris Mason | 6702ed4 | 2007-08-07 16:15:09 -0400 | [diff] [blame] | 4118 | if (wret < 0) { |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 4119 | ret = wret; |
| 4120 | goto out; |
| 4121 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4122 | node = path->nodes[level]; |
| 4123 | btrfs_node_key(node, &found_key, path->slots[level]); |
| 4124 | WARN_ON(memcmp(&found_key, &root_item->drop_progress, |
| 4125 | sizeof(found_key))); |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 4126 | /* |
| 4127 | * unlock our path, this is safe because only this |
| 4128 | * function is allowed to delete this snapshot |
| 4129 | */ |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 4130 | for (i = 0; i < BTRFS_MAX_LEVEL; i++) { |
| 4131 | if (path->nodes[i] && path->locks[i]) { |
| 4132 | path->locks[i] = 0; |
| 4133 | btrfs_tree_unlock(path->nodes[i]); |
| 4134 | } |
| 4135 | } |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 4136 | } |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4137 | while (1) { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 4138 | wret = walk_down_tree(trans, root, path, &level); |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 4139 | if (wret > 0) |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 4140 | break; |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 4141 | if (wret < 0) |
| 4142 | ret = wret; |
| 4143 | |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 4144 | wret = walk_up_tree(trans, root, path, &level, |
| 4145 | BTRFS_MAX_LEVEL); |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 4146 | if (wret > 0) |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 4147 | break; |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 4148 | if (wret < 0) |
| 4149 | ret = wret; |
Chris Mason | e7a8456 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 4150 | if (trans->transaction->in_commit) { |
| 4151 | ret = -EAGAIN; |
| 4152 | break; |
| 4153 | } |
Chris Mason | 18e35e0a | 2008-08-01 13:11:41 -0400 | [diff] [blame] | 4154 | atomic_inc(&root->fs_info->throttle_gen); |
Chris Mason | 017e536 | 2008-07-28 15:32:51 -0400 | [diff] [blame] | 4155 | wake_up(&root->fs_info->transaction_throttle); |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 4156 | } |
Chris Mason | 83e15a2 | 2007-03-12 09:03:27 -0400 | [diff] [blame] | 4157 | for (i = 0; i <= orig_level; i++) { |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 4158 | if (path->nodes[i]) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4159 | free_extent_buffer(path->nodes[i]); |
Chris Mason | 0f82731 | 2007-10-15 16:18:56 -0400 | [diff] [blame] | 4160 | path->nodes[i] = NULL; |
Chris Mason | 83e15a2 | 2007-03-12 09:03:27 -0400 | [diff] [blame] | 4161 | } |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 4162 | } |
Chris Mason | 9f3a742 | 2007-08-07 15:52:19 -0400 | [diff] [blame] | 4163 | out: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 4164 | btrfs_free_path(path); |
Chris Mason | 9aca1d5 | 2007-03-13 11:09:37 -0400 | [diff] [blame] | 4165 | return ret; |
Chris Mason | 20524f0 | 2007-03-10 06:35:47 -0500 | [diff] [blame] | 4166 | } |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 4167 | |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 4168 | int btrfs_drop_subtree(struct btrfs_trans_handle *trans, |
| 4169 | struct btrfs_root *root, |
| 4170 | struct extent_buffer *node, |
| 4171 | struct extent_buffer *parent) |
| 4172 | { |
| 4173 | struct btrfs_path *path; |
| 4174 | int level; |
| 4175 | int parent_level; |
| 4176 | int ret = 0; |
| 4177 | int wret; |
| 4178 | |
| 4179 | path = btrfs_alloc_path(); |
| 4180 | BUG_ON(!path); |
| 4181 | |
| 4182 | BUG_ON(!btrfs_tree_locked(parent)); |
| 4183 | parent_level = btrfs_header_level(parent); |
| 4184 | extent_buffer_get(parent); |
| 4185 | path->nodes[parent_level] = parent; |
| 4186 | path->slots[parent_level] = btrfs_header_nritems(parent); |
| 4187 | |
| 4188 | BUG_ON(!btrfs_tree_locked(node)); |
| 4189 | level = btrfs_header_level(node); |
| 4190 | extent_buffer_get(node); |
| 4191 | path->nodes[level] = node; |
| 4192 | path->slots[level] = 0; |
| 4193 | |
| 4194 | while (1) { |
| 4195 | wret = walk_down_subtree(trans, root, path, &level); |
| 4196 | if (wret < 0) |
| 4197 | ret = wret; |
| 4198 | if (wret != 0) |
| 4199 | break; |
| 4200 | |
| 4201 | wret = walk_up_tree(trans, root, path, &level, parent_level); |
| 4202 | if (wret < 0) |
| 4203 | ret = wret; |
| 4204 | if (wret != 0) |
| 4205 | break; |
| 4206 | } |
| 4207 | |
| 4208 | btrfs_free_path(path); |
| 4209 | return ret; |
| 4210 | } |
| 4211 | |
Chris Mason | 8e7bf94 | 2008-04-28 09:02:36 -0400 | [diff] [blame] | 4212 | static unsigned long calc_ra(unsigned long start, unsigned long last, |
| 4213 | unsigned long nr) |
| 4214 | { |
| 4215 | return min(last, start + nr - 1); |
| 4216 | } |
| 4217 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4218 | static noinline int relocate_inode_pages(struct inode *inode, u64 start, |
Chris Mason | 98ed517 | 2008-01-03 10:01:48 -0500 | [diff] [blame] | 4219 | u64 len) |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4220 | { |
| 4221 | u64 page_start; |
| 4222 | u64 page_end; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4223 | unsigned long first_index; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4224 | unsigned long last_index; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4225 | unsigned long i; |
| 4226 | struct page *page; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 4227 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 4228 | struct file_ra_state *ra; |
Chris Mason | 3eaa288 | 2008-07-24 11:57:52 -0400 | [diff] [blame] | 4229 | struct btrfs_ordered_extent *ordered; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4230 | unsigned int total_read = 0; |
| 4231 | unsigned int total_dirty = 0; |
| 4232 | int ret = 0; |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 4233 | |
| 4234 | ra = kzalloc(sizeof(*ra), GFP_NOFS); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4235 | |
| 4236 | mutex_lock(&inode->i_mutex); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4237 | first_index = start >> PAGE_CACHE_SHIFT; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4238 | last_index = (start + len - 1) >> PAGE_CACHE_SHIFT; |
| 4239 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4240 | /* make sure the dirty trick played by the caller work */ |
| 4241 | ret = invalidate_inode_pages2_range(inode->i_mapping, |
| 4242 | first_index, last_index); |
| 4243 | if (ret) |
| 4244 | goto out_unlock; |
Chris Mason | 8e7bf94 | 2008-04-28 09:02:36 -0400 | [diff] [blame] | 4245 | |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 4246 | file_ra_state_init(ra, inode->i_mapping); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4247 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4248 | for (i = first_index ; i <= last_index; i++) { |
| 4249 | if (total_read % ra->ra_pages == 0) { |
Chris Mason | 8e7bf94 | 2008-04-28 09:02:36 -0400 | [diff] [blame] | 4250 | btrfs_force_ra(inode->i_mapping, ra, NULL, i, |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4251 | calc_ra(i, last_index, ra->ra_pages)); |
Chris Mason | 8e7bf94 | 2008-04-28 09:02:36 -0400 | [diff] [blame] | 4252 | } |
| 4253 | total_read++; |
Chris Mason | 3eaa288 | 2008-07-24 11:57:52 -0400 | [diff] [blame] | 4254 | again: |
| 4255 | if (((u64)i << PAGE_CACHE_SHIFT) > i_size_read(inode)) |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4256 | BUG_ON(1); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4257 | page = grab_cache_page(inode->i_mapping, i); |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 4258 | if (!page) { |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4259 | ret = -ENOMEM; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4260 | goto out_unlock; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 4261 | } |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4262 | if (!PageUptodate(page)) { |
| 4263 | btrfs_readpage(NULL, page); |
| 4264 | lock_page(page); |
| 4265 | if (!PageUptodate(page)) { |
| 4266 | unlock_page(page); |
| 4267 | page_cache_release(page); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4268 | ret = -EIO; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4269 | goto out_unlock; |
| 4270 | } |
| 4271 | } |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 4272 | wait_on_page_writeback(page); |
Chris Mason | 3eaa288 | 2008-07-24 11:57:52 -0400 | [diff] [blame] | 4273 | |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4274 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
| 4275 | page_end = page_start + PAGE_CACHE_SIZE - 1; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 4276 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4277 | |
Chris Mason | 3eaa288 | 2008-07-24 11:57:52 -0400 | [diff] [blame] | 4278 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
| 4279 | if (ordered) { |
| 4280 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
| 4281 | unlock_page(page); |
| 4282 | page_cache_release(page); |
| 4283 | btrfs_start_ordered_extent(inode, ordered, 1); |
| 4284 | btrfs_put_ordered_extent(ordered); |
| 4285 | goto again; |
| 4286 | } |
| 4287 | set_page_extent_mapped(page); |
| 4288 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4289 | if (i == first_index) |
| 4290 | set_extent_bits(io_tree, page_start, page_end, |
| 4291 | EXTENT_BOUNDARY, GFP_NOFS); |
Yan Zheng | 1f80e4d | 2008-12-19 10:59:04 -0500 | [diff] [blame] | 4292 | btrfs_set_extent_delalloc(inode, page_start, page_end); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4293 | |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 4294 | set_page_dirty(page); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4295 | total_dirty++; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4296 | |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 4297 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4298 | unlock_page(page); |
| 4299 | page_cache_release(page); |
| 4300 | } |
| 4301 | |
| 4302 | out_unlock: |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 4303 | kfree(ra); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4304 | mutex_unlock(&inode->i_mutex); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4305 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, total_dirty); |
Chris Mason | bf4ef67 | 2008-05-08 13:26:18 -0400 | [diff] [blame] | 4306 | return ret; |
| 4307 | } |
| 4308 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4309 | static noinline int relocate_data_extent(struct inode *reloc_inode, |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4310 | struct btrfs_key *extent_key, |
| 4311 | u64 offset) |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4312 | { |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4313 | struct btrfs_root *root = BTRFS_I(reloc_inode)->root; |
| 4314 | struct extent_map_tree *em_tree = &BTRFS_I(reloc_inode)->extent_tree; |
| 4315 | struct extent_map *em; |
Yan Zheng | 6643558 | 2008-10-30 14:19:50 -0400 | [diff] [blame] | 4316 | u64 start = extent_key->objectid - offset; |
| 4317 | u64 end = start + extent_key->offset - 1; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4318 | |
| 4319 | em = alloc_extent_map(GFP_NOFS); |
| 4320 | BUG_ON(!em || IS_ERR(em)); |
| 4321 | |
Yan Zheng | 6643558 | 2008-10-30 14:19:50 -0400 | [diff] [blame] | 4322 | em->start = start; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4323 | em->len = extent_key->offset; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 4324 | em->block_len = extent_key->offset; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4325 | em->block_start = extent_key->objectid; |
| 4326 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
| 4327 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
| 4328 | |
| 4329 | /* setup extent map to cheat btrfs_readpage */ |
Yan Zheng | 6643558 | 2008-10-30 14:19:50 -0400 | [diff] [blame] | 4330 | lock_extent(&BTRFS_I(reloc_inode)->io_tree, start, end, GFP_NOFS); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4331 | while (1) { |
| 4332 | int ret; |
| 4333 | spin_lock(&em_tree->lock); |
| 4334 | ret = add_extent_mapping(em_tree, em); |
| 4335 | spin_unlock(&em_tree->lock); |
| 4336 | if (ret != -EEXIST) { |
| 4337 | free_extent_map(em); |
| 4338 | break; |
| 4339 | } |
Yan Zheng | 6643558 | 2008-10-30 14:19:50 -0400 | [diff] [blame] | 4340 | btrfs_drop_extent_cache(reloc_inode, start, end, 0); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4341 | } |
Yan Zheng | 6643558 | 2008-10-30 14:19:50 -0400 | [diff] [blame] | 4342 | unlock_extent(&BTRFS_I(reloc_inode)->io_tree, start, end, GFP_NOFS); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4343 | |
Yan Zheng | 6643558 | 2008-10-30 14:19:50 -0400 | [diff] [blame] | 4344 | return relocate_inode_pages(reloc_inode, start, extent_key->offset); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4345 | } |
| 4346 | |
| 4347 | struct btrfs_ref_path { |
| 4348 | u64 extent_start; |
| 4349 | u64 nodes[BTRFS_MAX_LEVEL]; |
| 4350 | u64 root_objectid; |
| 4351 | u64 root_generation; |
| 4352 | u64 owner_objectid; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4353 | u32 num_refs; |
| 4354 | int lowest_level; |
| 4355 | int current_level; |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 4356 | int shared_level; |
| 4357 | |
| 4358 | struct btrfs_key node_keys[BTRFS_MAX_LEVEL]; |
| 4359 | u64 new_nodes[BTRFS_MAX_LEVEL]; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4360 | }; |
| 4361 | |
| 4362 | struct disk_extent { |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 4363 | u64 ram_bytes; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4364 | u64 disk_bytenr; |
| 4365 | u64 disk_num_bytes; |
| 4366 | u64 offset; |
| 4367 | u64 num_bytes; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 4368 | u8 compression; |
| 4369 | u8 encryption; |
| 4370 | u16 other_encoding; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4371 | }; |
| 4372 | |
| 4373 | static int is_cowonly_root(u64 root_objectid) |
| 4374 | { |
| 4375 | if (root_objectid == BTRFS_ROOT_TREE_OBJECTID || |
| 4376 | root_objectid == BTRFS_EXTENT_TREE_OBJECTID || |
| 4377 | root_objectid == BTRFS_CHUNK_TREE_OBJECTID || |
| 4378 | root_objectid == BTRFS_DEV_TREE_OBJECTID || |
Yan Zheng | 0403e47 | 2008-12-10 20:32:51 -0500 | [diff] [blame] | 4379 | root_objectid == BTRFS_TREE_LOG_OBJECTID || |
| 4380 | root_objectid == BTRFS_CSUM_TREE_OBJECTID) |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4381 | return 1; |
| 4382 | return 0; |
| 4383 | } |
| 4384 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4385 | static noinline int __next_ref_path(struct btrfs_trans_handle *trans, |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4386 | struct btrfs_root *extent_root, |
| 4387 | struct btrfs_ref_path *ref_path, |
| 4388 | int first_time) |
| 4389 | { |
| 4390 | struct extent_buffer *leaf; |
| 4391 | struct btrfs_path *path; |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 4392 | struct btrfs_extent_ref *ref; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4393 | struct btrfs_key key; |
| 4394 | struct btrfs_key found_key; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4395 | u64 bytenr; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4396 | u32 nritems; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4397 | int level; |
| 4398 | int ret = 1; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4399 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4400 | path = btrfs_alloc_path(); |
| 4401 | if (!path) |
| 4402 | return -ENOMEM; |
| 4403 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4404 | if (first_time) { |
| 4405 | ref_path->lowest_level = -1; |
| 4406 | ref_path->current_level = -1; |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 4407 | ref_path->shared_level = -1; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4408 | goto walk_up; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 4409 | } |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4410 | walk_down: |
| 4411 | level = ref_path->current_level - 1; |
| 4412 | while (level >= -1) { |
| 4413 | u64 parent; |
| 4414 | if (level < ref_path->lowest_level) |
| 4415 | break; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4416 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4417 | if (level >= 0) |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4418 | bytenr = ref_path->nodes[level]; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4419 | else |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4420 | bytenr = ref_path->extent_start; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4421 | BUG_ON(bytenr == 0); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4422 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4423 | parent = ref_path->nodes[level + 1]; |
| 4424 | ref_path->nodes[level + 1] = 0; |
| 4425 | ref_path->current_level = level; |
| 4426 | BUG_ON(parent == 0); |
| 4427 | |
| 4428 | key.objectid = bytenr; |
| 4429 | key.offset = parent + 1; |
| 4430 | key.type = BTRFS_EXTENT_REF_KEY; |
| 4431 | |
| 4432 | ret = btrfs_search_slot(trans, extent_root, &key, path, 0, 0); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4433 | if (ret < 0) |
| 4434 | goto out; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4435 | BUG_ON(ret == 0); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4436 | |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4437 | leaf = path->nodes[0]; |
| 4438 | nritems = btrfs_header_nritems(leaf); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4439 | if (path->slots[0] >= nritems) { |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 4440 | ret = btrfs_next_leaf(extent_root, path); |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 4441 | if (ret < 0) |
| 4442 | goto out; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4443 | if (ret > 0) |
| 4444 | goto next; |
Chris Mason | bf4ef67 | 2008-05-08 13:26:18 -0400 | [diff] [blame] | 4445 | leaf = path->nodes[0]; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 4446 | } |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4447 | |
| 4448 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4449 | if (found_key.objectid == bytenr && |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 4450 | found_key.type == BTRFS_EXTENT_REF_KEY) { |
| 4451 | if (level < ref_path->shared_level) |
| 4452 | ref_path->shared_level = level; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4453 | goto found; |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 4454 | } |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4455 | next: |
| 4456 | level--; |
| 4457 | btrfs_release_path(extent_root, path); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 4458 | cond_resched(); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4459 | } |
| 4460 | /* reached lowest level */ |
| 4461 | ret = 1; |
| 4462 | goto out; |
| 4463 | walk_up: |
| 4464 | level = ref_path->current_level; |
| 4465 | while (level < BTRFS_MAX_LEVEL - 1) { |
| 4466 | u64 ref_objectid; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4467 | |
| 4468 | if (level >= 0) |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4469 | bytenr = ref_path->nodes[level]; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4470 | else |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4471 | bytenr = ref_path->extent_start; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4472 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4473 | BUG_ON(bytenr == 0); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4474 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4475 | key.objectid = bytenr; |
| 4476 | key.offset = 0; |
| 4477 | key.type = BTRFS_EXTENT_REF_KEY; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4478 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4479 | ret = btrfs_search_slot(trans, extent_root, &key, path, 0, 0); |
| 4480 | if (ret < 0) |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4481 | goto out; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4482 | |
| 4483 | leaf = path->nodes[0]; |
| 4484 | nritems = btrfs_header_nritems(leaf); |
| 4485 | if (path->slots[0] >= nritems) { |
| 4486 | ret = btrfs_next_leaf(extent_root, path); |
| 4487 | if (ret < 0) |
| 4488 | goto out; |
| 4489 | if (ret > 0) { |
| 4490 | /* the extent was freed by someone */ |
| 4491 | if (ref_path->lowest_level == level) |
| 4492 | goto out; |
| 4493 | btrfs_release_path(extent_root, path); |
| 4494 | goto walk_down; |
| 4495 | } |
| 4496 | leaf = path->nodes[0]; |
| 4497 | } |
| 4498 | |
| 4499 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
| 4500 | if (found_key.objectid != bytenr || |
| 4501 | found_key.type != BTRFS_EXTENT_REF_KEY) { |
| 4502 | /* the extent was freed by someone */ |
| 4503 | if (ref_path->lowest_level == level) { |
| 4504 | ret = 1; |
| 4505 | goto out; |
| 4506 | } |
| 4507 | btrfs_release_path(extent_root, path); |
| 4508 | goto walk_down; |
| 4509 | } |
| 4510 | found: |
| 4511 | ref = btrfs_item_ptr(leaf, path->slots[0], |
| 4512 | struct btrfs_extent_ref); |
| 4513 | ref_objectid = btrfs_ref_objectid(leaf, ref); |
| 4514 | if (ref_objectid < BTRFS_FIRST_FREE_OBJECTID) { |
| 4515 | if (first_time) { |
| 4516 | level = (int)ref_objectid; |
| 4517 | BUG_ON(level >= BTRFS_MAX_LEVEL); |
| 4518 | ref_path->lowest_level = level; |
| 4519 | ref_path->current_level = level; |
| 4520 | ref_path->nodes[level] = bytenr; |
| 4521 | } else { |
| 4522 | WARN_ON(ref_objectid != level); |
| 4523 | } |
| 4524 | } else { |
| 4525 | WARN_ON(level != -1); |
| 4526 | } |
| 4527 | first_time = 0; |
| 4528 | |
| 4529 | if (ref_path->lowest_level == level) { |
| 4530 | ref_path->owner_objectid = ref_objectid; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4531 | ref_path->num_refs = btrfs_ref_num_refs(leaf, ref); |
| 4532 | } |
| 4533 | |
| 4534 | /* |
| 4535 | * the block is tree root or the block isn't in reference |
| 4536 | * counted tree. |
| 4537 | */ |
| 4538 | if (found_key.objectid == found_key.offset || |
| 4539 | is_cowonly_root(btrfs_ref_root(leaf, ref))) { |
| 4540 | ref_path->root_objectid = btrfs_ref_root(leaf, ref); |
| 4541 | ref_path->root_generation = |
| 4542 | btrfs_ref_generation(leaf, ref); |
| 4543 | if (level < 0) { |
| 4544 | /* special reference from the tree log */ |
| 4545 | ref_path->nodes[0] = found_key.offset; |
| 4546 | ref_path->current_level = 0; |
| 4547 | } |
| 4548 | ret = 0; |
| 4549 | goto out; |
| 4550 | } |
| 4551 | |
| 4552 | level++; |
| 4553 | BUG_ON(ref_path->nodes[level] != 0); |
| 4554 | ref_path->nodes[level] = found_key.offset; |
| 4555 | ref_path->current_level = level; |
| 4556 | |
| 4557 | /* |
| 4558 | * the reference was created in the running transaction, |
| 4559 | * no need to continue walking up. |
| 4560 | */ |
| 4561 | if (btrfs_ref_generation(leaf, ref) == trans->transid) { |
| 4562 | ref_path->root_objectid = btrfs_ref_root(leaf, ref); |
| 4563 | ref_path->root_generation = |
| 4564 | btrfs_ref_generation(leaf, ref); |
| 4565 | ret = 0; |
| 4566 | goto out; |
| 4567 | } |
| 4568 | |
| 4569 | btrfs_release_path(extent_root, path); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 4570 | cond_resched(); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4571 | } |
| 4572 | /* reached max tree level, but no tree root found. */ |
| 4573 | BUG(); |
| 4574 | out: |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4575 | btrfs_free_path(path); |
| 4576 | return ret; |
| 4577 | } |
| 4578 | |
| 4579 | static int btrfs_first_ref_path(struct btrfs_trans_handle *trans, |
| 4580 | struct btrfs_root *extent_root, |
| 4581 | struct btrfs_ref_path *ref_path, |
| 4582 | u64 extent_start) |
| 4583 | { |
| 4584 | memset(ref_path, 0, sizeof(*ref_path)); |
| 4585 | ref_path->extent_start = extent_start; |
| 4586 | |
| 4587 | return __next_ref_path(trans, extent_root, ref_path, 1); |
| 4588 | } |
| 4589 | |
| 4590 | static int btrfs_next_ref_path(struct btrfs_trans_handle *trans, |
| 4591 | struct btrfs_root *extent_root, |
| 4592 | struct btrfs_ref_path *ref_path) |
| 4593 | { |
| 4594 | return __next_ref_path(trans, extent_root, ref_path, 0); |
| 4595 | } |
| 4596 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4597 | static noinline int get_new_locations(struct inode *reloc_inode, |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4598 | struct btrfs_key *extent_key, |
| 4599 | u64 offset, int no_fragment, |
| 4600 | struct disk_extent **extents, |
| 4601 | int *nr_extents) |
| 4602 | { |
| 4603 | struct btrfs_root *root = BTRFS_I(reloc_inode)->root; |
| 4604 | struct btrfs_path *path; |
| 4605 | struct btrfs_file_extent_item *fi; |
| 4606 | struct extent_buffer *leaf; |
| 4607 | struct disk_extent *exts = *extents; |
| 4608 | struct btrfs_key found_key; |
| 4609 | u64 cur_pos; |
| 4610 | u64 last_byte; |
| 4611 | u32 nritems; |
| 4612 | int nr = 0; |
| 4613 | int max = *nr_extents; |
| 4614 | int ret; |
| 4615 | |
| 4616 | WARN_ON(!no_fragment && *extents); |
| 4617 | if (!exts) { |
| 4618 | max = 1; |
| 4619 | exts = kmalloc(sizeof(*exts) * max, GFP_NOFS); |
| 4620 | if (!exts) |
| 4621 | return -ENOMEM; |
| 4622 | } |
| 4623 | |
| 4624 | path = btrfs_alloc_path(); |
| 4625 | BUG_ON(!path); |
| 4626 | |
| 4627 | cur_pos = extent_key->objectid - offset; |
| 4628 | last_byte = extent_key->objectid + extent_key->offset; |
| 4629 | ret = btrfs_lookup_file_extent(NULL, root, path, reloc_inode->i_ino, |
| 4630 | cur_pos, 0); |
| 4631 | if (ret < 0) |
| 4632 | goto out; |
| 4633 | if (ret > 0) { |
| 4634 | ret = -ENOENT; |
| 4635 | goto out; |
| 4636 | } |
| 4637 | |
| 4638 | while (1) { |
| 4639 | leaf = path->nodes[0]; |
| 4640 | nritems = btrfs_header_nritems(leaf); |
| 4641 | if (path->slots[0] >= nritems) { |
| 4642 | ret = btrfs_next_leaf(root, path); |
| 4643 | if (ret < 0) |
| 4644 | goto out; |
| 4645 | if (ret > 0) |
| 4646 | break; |
| 4647 | leaf = path->nodes[0]; |
| 4648 | } |
| 4649 | |
| 4650 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
| 4651 | if (found_key.offset != cur_pos || |
| 4652 | found_key.type != BTRFS_EXTENT_DATA_KEY || |
| 4653 | found_key.objectid != reloc_inode->i_ino) |
| 4654 | break; |
| 4655 | |
| 4656 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 4657 | struct btrfs_file_extent_item); |
| 4658 | if (btrfs_file_extent_type(leaf, fi) != |
| 4659 | BTRFS_FILE_EXTENT_REG || |
| 4660 | btrfs_file_extent_disk_bytenr(leaf, fi) == 0) |
| 4661 | break; |
| 4662 | |
| 4663 | if (nr == max) { |
| 4664 | struct disk_extent *old = exts; |
| 4665 | max *= 2; |
| 4666 | exts = kzalloc(sizeof(*exts) * max, GFP_NOFS); |
| 4667 | memcpy(exts, old, sizeof(*exts) * nr); |
| 4668 | if (old != *extents) |
| 4669 | kfree(old); |
| 4670 | } |
| 4671 | |
| 4672 | exts[nr].disk_bytenr = |
| 4673 | btrfs_file_extent_disk_bytenr(leaf, fi); |
| 4674 | exts[nr].disk_num_bytes = |
| 4675 | btrfs_file_extent_disk_num_bytes(leaf, fi); |
| 4676 | exts[nr].offset = btrfs_file_extent_offset(leaf, fi); |
| 4677 | exts[nr].num_bytes = btrfs_file_extent_num_bytes(leaf, fi); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 4678 | exts[nr].ram_bytes = btrfs_file_extent_ram_bytes(leaf, fi); |
| 4679 | exts[nr].compression = btrfs_file_extent_compression(leaf, fi); |
| 4680 | exts[nr].encryption = btrfs_file_extent_encryption(leaf, fi); |
| 4681 | exts[nr].other_encoding = btrfs_file_extent_other_encoding(leaf, |
| 4682 | fi); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 4683 | BUG_ON(exts[nr].offset > 0); |
| 4684 | BUG_ON(exts[nr].compression || exts[nr].encryption); |
| 4685 | BUG_ON(exts[nr].num_bytes != exts[nr].disk_num_bytes); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4686 | |
| 4687 | cur_pos += exts[nr].num_bytes; |
| 4688 | nr++; |
| 4689 | |
| 4690 | if (cur_pos + offset >= last_byte) |
| 4691 | break; |
| 4692 | |
| 4693 | if (no_fragment) { |
| 4694 | ret = 1; |
| 4695 | goto out; |
| 4696 | } |
| 4697 | path->slots[0]++; |
| 4698 | } |
| 4699 | |
Yan Zheng | 1f80e4d | 2008-12-19 10:59:04 -0500 | [diff] [blame] | 4700 | BUG_ON(cur_pos + offset > last_byte); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4701 | if (cur_pos + offset < last_byte) { |
| 4702 | ret = -ENOENT; |
| 4703 | goto out; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4704 | } |
| 4705 | ret = 0; |
| 4706 | out: |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4707 | btrfs_free_path(path); |
| 4708 | if (ret) { |
| 4709 | if (exts != *extents) |
| 4710 | kfree(exts); |
| 4711 | } else { |
| 4712 | *extents = exts; |
| 4713 | *nr_extents = nr; |
| 4714 | } |
| 4715 | return ret; |
| 4716 | } |
| 4717 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4718 | static noinline int replace_one_extent(struct btrfs_trans_handle *trans, |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4719 | struct btrfs_root *root, |
| 4720 | struct btrfs_path *path, |
| 4721 | struct btrfs_key *extent_key, |
| 4722 | struct btrfs_key *leaf_key, |
| 4723 | struct btrfs_ref_path *ref_path, |
| 4724 | struct disk_extent *new_extents, |
| 4725 | int nr_extents) |
| 4726 | { |
| 4727 | struct extent_buffer *leaf; |
| 4728 | struct btrfs_file_extent_item *fi; |
| 4729 | struct inode *inode = NULL; |
| 4730 | struct btrfs_key key; |
| 4731 | u64 lock_start = 0; |
| 4732 | u64 lock_end = 0; |
| 4733 | u64 num_bytes; |
| 4734 | u64 ext_offset; |
Yan Zheng | 86288a1 | 2009-01-21 10:49:16 -0500 | [diff] [blame] | 4735 | u64 search_end = (u64)-1; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4736 | u32 nritems; |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 4737 | int nr_scaned = 0; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4738 | int extent_locked = 0; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 4739 | int extent_type; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4740 | int ret; |
| 4741 | |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 4742 | memcpy(&key, leaf_key, sizeof(key)); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4743 | if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS) { |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 4744 | if (key.objectid < ref_path->owner_objectid || |
| 4745 | (key.objectid == ref_path->owner_objectid && |
| 4746 | key.type < BTRFS_EXTENT_DATA_KEY)) { |
| 4747 | key.objectid = ref_path->owner_objectid; |
| 4748 | key.type = BTRFS_EXTENT_DATA_KEY; |
| 4749 | key.offset = 0; |
| 4750 | } |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4751 | } |
| 4752 | |
| 4753 | while (1) { |
| 4754 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); |
| 4755 | if (ret < 0) |
| 4756 | goto out; |
| 4757 | |
| 4758 | leaf = path->nodes[0]; |
| 4759 | nritems = btrfs_header_nritems(leaf); |
| 4760 | next: |
| 4761 | if (extent_locked && ret > 0) { |
| 4762 | /* |
| 4763 | * the file extent item was modified by someone |
| 4764 | * before the extent got locked. |
| 4765 | */ |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4766 | unlock_extent(&BTRFS_I(inode)->io_tree, lock_start, |
| 4767 | lock_end, GFP_NOFS); |
| 4768 | extent_locked = 0; |
| 4769 | } |
| 4770 | |
| 4771 | if (path->slots[0] >= nritems) { |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 4772 | if (++nr_scaned > 2) |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4773 | break; |
| 4774 | |
| 4775 | BUG_ON(extent_locked); |
| 4776 | ret = btrfs_next_leaf(root, path); |
| 4777 | if (ret < 0) |
| 4778 | goto out; |
| 4779 | if (ret > 0) |
| 4780 | break; |
| 4781 | leaf = path->nodes[0]; |
| 4782 | nritems = btrfs_header_nritems(leaf); |
| 4783 | } |
| 4784 | |
| 4785 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| 4786 | |
| 4787 | if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS) { |
| 4788 | if ((key.objectid > ref_path->owner_objectid) || |
| 4789 | (key.objectid == ref_path->owner_objectid && |
| 4790 | key.type > BTRFS_EXTENT_DATA_KEY) || |
Yan Zheng | 86288a1 | 2009-01-21 10:49:16 -0500 | [diff] [blame] | 4791 | key.offset >= search_end) |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4792 | break; |
| 4793 | } |
| 4794 | |
| 4795 | if (inode && key.objectid != inode->i_ino) { |
| 4796 | BUG_ON(extent_locked); |
| 4797 | btrfs_release_path(root, path); |
| 4798 | mutex_unlock(&inode->i_mutex); |
| 4799 | iput(inode); |
| 4800 | inode = NULL; |
| 4801 | continue; |
| 4802 | } |
| 4803 | |
| 4804 | if (key.type != BTRFS_EXTENT_DATA_KEY) { |
| 4805 | path->slots[0]++; |
| 4806 | ret = 1; |
| 4807 | goto next; |
| 4808 | } |
| 4809 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 4810 | struct btrfs_file_extent_item); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 4811 | extent_type = btrfs_file_extent_type(leaf, fi); |
| 4812 | if ((extent_type != BTRFS_FILE_EXTENT_REG && |
| 4813 | extent_type != BTRFS_FILE_EXTENT_PREALLOC) || |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4814 | (btrfs_file_extent_disk_bytenr(leaf, fi) != |
| 4815 | extent_key->objectid)) { |
| 4816 | path->slots[0]++; |
| 4817 | ret = 1; |
| 4818 | goto next; |
| 4819 | } |
| 4820 | |
| 4821 | num_bytes = btrfs_file_extent_num_bytes(leaf, fi); |
| 4822 | ext_offset = btrfs_file_extent_offset(leaf, fi); |
| 4823 | |
Yan Zheng | 86288a1 | 2009-01-21 10:49:16 -0500 | [diff] [blame] | 4824 | if (search_end == (u64)-1) { |
| 4825 | search_end = key.offset - ext_offset + |
| 4826 | btrfs_file_extent_ram_bytes(leaf, fi); |
| 4827 | } |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4828 | |
| 4829 | if (!extent_locked) { |
| 4830 | lock_start = key.offset; |
| 4831 | lock_end = lock_start + num_bytes - 1; |
| 4832 | } else { |
Yan Zheng | 6643558 | 2008-10-30 14:19:50 -0400 | [diff] [blame] | 4833 | if (lock_start > key.offset || |
| 4834 | lock_end + 1 < key.offset + num_bytes) { |
| 4835 | unlock_extent(&BTRFS_I(inode)->io_tree, |
| 4836 | lock_start, lock_end, GFP_NOFS); |
| 4837 | extent_locked = 0; |
| 4838 | } |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4839 | } |
| 4840 | |
| 4841 | if (!inode) { |
| 4842 | btrfs_release_path(root, path); |
| 4843 | |
| 4844 | inode = btrfs_iget_locked(root->fs_info->sb, |
| 4845 | key.objectid, root); |
| 4846 | if (inode->i_state & I_NEW) { |
| 4847 | BTRFS_I(inode)->root = root; |
| 4848 | BTRFS_I(inode)->location.objectid = |
| 4849 | key.objectid; |
| 4850 | BTRFS_I(inode)->location.type = |
| 4851 | BTRFS_INODE_ITEM_KEY; |
| 4852 | BTRFS_I(inode)->location.offset = 0; |
| 4853 | btrfs_read_locked_inode(inode); |
| 4854 | unlock_new_inode(inode); |
| 4855 | } |
| 4856 | /* |
| 4857 | * some code call btrfs_commit_transaction while |
| 4858 | * holding the i_mutex, so we can't use mutex_lock |
| 4859 | * here. |
| 4860 | */ |
| 4861 | if (is_bad_inode(inode) || |
| 4862 | !mutex_trylock(&inode->i_mutex)) { |
| 4863 | iput(inode); |
| 4864 | inode = NULL; |
| 4865 | key.offset = (u64)-1; |
| 4866 | goto skip; |
| 4867 | } |
| 4868 | } |
| 4869 | |
| 4870 | if (!extent_locked) { |
| 4871 | struct btrfs_ordered_extent *ordered; |
| 4872 | |
| 4873 | btrfs_release_path(root, path); |
| 4874 | |
| 4875 | lock_extent(&BTRFS_I(inode)->io_tree, lock_start, |
| 4876 | lock_end, GFP_NOFS); |
| 4877 | ordered = btrfs_lookup_first_ordered_extent(inode, |
| 4878 | lock_end); |
| 4879 | if (ordered && |
| 4880 | ordered->file_offset <= lock_end && |
| 4881 | ordered->file_offset + ordered->len > lock_start) { |
| 4882 | unlock_extent(&BTRFS_I(inode)->io_tree, |
| 4883 | lock_start, lock_end, GFP_NOFS); |
| 4884 | btrfs_start_ordered_extent(inode, ordered, 1); |
| 4885 | btrfs_put_ordered_extent(ordered); |
| 4886 | key.offset += num_bytes; |
| 4887 | goto skip; |
| 4888 | } |
| 4889 | if (ordered) |
| 4890 | btrfs_put_ordered_extent(ordered); |
| 4891 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4892 | extent_locked = 1; |
| 4893 | continue; |
| 4894 | } |
| 4895 | |
| 4896 | if (nr_extents == 1) { |
| 4897 | /* update extent pointer in place */ |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4898 | btrfs_set_file_extent_disk_bytenr(leaf, fi, |
| 4899 | new_extents[0].disk_bytenr); |
| 4900 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, |
| 4901 | new_extents[0].disk_num_bytes); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4902 | btrfs_mark_buffer_dirty(leaf); |
| 4903 | |
| 4904 | btrfs_drop_extent_cache(inode, key.offset, |
| 4905 | key.offset + num_bytes - 1, 0); |
| 4906 | |
| 4907 | ret = btrfs_inc_extent_ref(trans, root, |
| 4908 | new_extents[0].disk_bytenr, |
| 4909 | new_extents[0].disk_num_bytes, |
| 4910 | leaf->start, |
| 4911 | root->root_key.objectid, |
| 4912 | trans->transid, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 4913 | key.objectid); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4914 | BUG_ON(ret); |
| 4915 | |
| 4916 | ret = btrfs_free_extent(trans, root, |
| 4917 | extent_key->objectid, |
| 4918 | extent_key->offset, |
| 4919 | leaf->start, |
| 4920 | btrfs_header_owner(leaf), |
| 4921 | btrfs_header_generation(leaf), |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 4922 | key.objectid, 0); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4923 | BUG_ON(ret); |
| 4924 | |
| 4925 | btrfs_release_path(root, path); |
| 4926 | key.offset += num_bytes; |
| 4927 | } else { |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 4928 | BUG_ON(1); |
| 4929 | #if 0 |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4930 | u64 alloc_hint; |
| 4931 | u64 extent_len; |
| 4932 | int i; |
| 4933 | /* |
| 4934 | * drop old extent pointer at first, then insert the |
| 4935 | * new pointers one bye one |
| 4936 | */ |
| 4937 | btrfs_release_path(root, path); |
| 4938 | ret = btrfs_drop_extents(trans, root, inode, key.offset, |
| 4939 | key.offset + num_bytes, |
| 4940 | key.offset, &alloc_hint); |
| 4941 | BUG_ON(ret); |
| 4942 | |
| 4943 | for (i = 0; i < nr_extents; i++) { |
| 4944 | if (ext_offset >= new_extents[i].num_bytes) { |
| 4945 | ext_offset -= new_extents[i].num_bytes; |
| 4946 | continue; |
| 4947 | } |
| 4948 | extent_len = min(new_extents[i].num_bytes - |
| 4949 | ext_offset, num_bytes); |
| 4950 | |
| 4951 | ret = btrfs_insert_empty_item(trans, root, |
| 4952 | path, &key, |
| 4953 | sizeof(*fi)); |
| 4954 | BUG_ON(ret); |
| 4955 | |
| 4956 | leaf = path->nodes[0]; |
| 4957 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 4958 | struct btrfs_file_extent_item); |
| 4959 | btrfs_set_file_extent_generation(leaf, fi, |
| 4960 | trans->transid); |
| 4961 | btrfs_set_file_extent_type(leaf, fi, |
| 4962 | BTRFS_FILE_EXTENT_REG); |
| 4963 | btrfs_set_file_extent_disk_bytenr(leaf, fi, |
| 4964 | new_extents[i].disk_bytenr); |
| 4965 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, |
| 4966 | new_extents[i].disk_num_bytes); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 4967 | btrfs_set_file_extent_ram_bytes(leaf, fi, |
| 4968 | new_extents[i].ram_bytes); |
| 4969 | |
| 4970 | btrfs_set_file_extent_compression(leaf, fi, |
| 4971 | new_extents[i].compression); |
| 4972 | btrfs_set_file_extent_encryption(leaf, fi, |
| 4973 | new_extents[i].encryption); |
| 4974 | btrfs_set_file_extent_other_encoding(leaf, fi, |
| 4975 | new_extents[i].other_encoding); |
| 4976 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4977 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 4978 | extent_len); |
| 4979 | ext_offset += new_extents[i].offset; |
| 4980 | btrfs_set_file_extent_offset(leaf, fi, |
| 4981 | ext_offset); |
| 4982 | btrfs_mark_buffer_dirty(leaf); |
| 4983 | |
| 4984 | btrfs_drop_extent_cache(inode, key.offset, |
| 4985 | key.offset + extent_len - 1, 0); |
| 4986 | |
| 4987 | ret = btrfs_inc_extent_ref(trans, root, |
| 4988 | new_extents[i].disk_bytenr, |
| 4989 | new_extents[i].disk_num_bytes, |
| 4990 | leaf->start, |
| 4991 | root->root_key.objectid, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 4992 | trans->transid, key.objectid); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4993 | BUG_ON(ret); |
| 4994 | btrfs_release_path(root, path); |
| 4995 | |
Yan Zheng | a76a3cd | 2008-10-09 11:46:29 -0400 | [diff] [blame] | 4996 | inode_add_bytes(inode, extent_len); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 4997 | |
| 4998 | ext_offset = 0; |
| 4999 | num_bytes -= extent_len; |
| 5000 | key.offset += extent_len; |
| 5001 | |
| 5002 | if (num_bytes == 0) |
| 5003 | break; |
| 5004 | } |
| 5005 | BUG_ON(i >= nr_extents); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5006 | #endif |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5007 | } |
| 5008 | |
| 5009 | if (extent_locked) { |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5010 | unlock_extent(&BTRFS_I(inode)->io_tree, lock_start, |
| 5011 | lock_end, GFP_NOFS); |
| 5012 | extent_locked = 0; |
| 5013 | } |
| 5014 | skip: |
| 5015 | if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS && |
Yan Zheng | 86288a1 | 2009-01-21 10:49:16 -0500 | [diff] [blame] | 5016 | key.offset >= search_end) |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5017 | break; |
| 5018 | |
| 5019 | cond_resched(); |
| 5020 | } |
| 5021 | ret = 0; |
| 5022 | out: |
| 5023 | btrfs_release_path(root, path); |
| 5024 | if (inode) { |
| 5025 | mutex_unlock(&inode->i_mutex); |
| 5026 | if (extent_locked) { |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5027 | unlock_extent(&BTRFS_I(inode)->io_tree, lock_start, |
| 5028 | lock_end, GFP_NOFS); |
| 5029 | } |
| 5030 | iput(inode); |
| 5031 | } |
| 5032 | return ret; |
| 5033 | } |
| 5034 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5035 | int btrfs_reloc_tree_cache_ref(struct btrfs_trans_handle *trans, |
| 5036 | struct btrfs_root *root, |
| 5037 | struct extent_buffer *buf, u64 orig_start) |
| 5038 | { |
| 5039 | int level; |
| 5040 | int ret; |
| 5041 | |
| 5042 | BUG_ON(btrfs_header_generation(buf) != trans->transid); |
| 5043 | BUG_ON(root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID); |
| 5044 | |
| 5045 | level = btrfs_header_level(buf); |
| 5046 | if (level == 0) { |
| 5047 | struct btrfs_leaf_ref *ref; |
| 5048 | struct btrfs_leaf_ref *orig_ref; |
| 5049 | |
| 5050 | orig_ref = btrfs_lookup_leaf_ref(root, orig_start); |
| 5051 | if (!orig_ref) |
| 5052 | return -ENOENT; |
| 5053 | |
| 5054 | ref = btrfs_alloc_leaf_ref(root, orig_ref->nritems); |
| 5055 | if (!ref) { |
| 5056 | btrfs_free_leaf_ref(root, orig_ref); |
| 5057 | return -ENOMEM; |
| 5058 | } |
| 5059 | |
| 5060 | ref->nritems = orig_ref->nritems; |
| 5061 | memcpy(ref->extents, orig_ref->extents, |
| 5062 | sizeof(ref->extents[0]) * ref->nritems); |
| 5063 | |
| 5064 | btrfs_free_leaf_ref(root, orig_ref); |
| 5065 | |
| 5066 | ref->root_gen = trans->transid; |
| 5067 | ref->bytenr = buf->start; |
| 5068 | ref->owner = btrfs_header_owner(buf); |
| 5069 | ref->generation = btrfs_header_generation(buf); |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 5070 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5071 | ret = btrfs_add_leaf_ref(root, ref, 0); |
| 5072 | WARN_ON(ret); |
| 5073 | btrfs_free_leaf_ref(root, ref); |
| 5074 | } |
| 5075 | return 0; |
| 5076 | } |
| 5077 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5078 | static noinline int invalidate_extent_cache(struct btrfs_root *root, |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5079 | struct extent_buffer *leaf, |
| 5080 | struct btrfs_block_group_cache *group, |
| 5081 | struct btrfs_root *target_root) |
| 5082 | { |
| 5083 | struct btrfs_key key; |
| 5084 | struct inode *inode = NULL; |
| 5085 | struct btrfs_file_extent_item *fi; |
| 5086 | u64 num_bytes; |
| 5087 | u64 skip_objectid = 0; |
| 5088 | u32 nritems; |
| 5089 | u32 i; |
| 5090 | |
| 5091 | nritems = btrfs_header_nritems(leaf); |
| 5092 | for (i = 0; i < nritems; i++) { |
| 5093 | btrfs_item_key_to_cpu(leaf, &key, i); |
| 5094 | if (key.objectid == skip_objectid || |
| 5095 | key.type != BTRFS_EXTENT_DATA_KEY) |
| 5096 | continue; |
| 5097 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); |
| 5098 | if (btrfs_file_extent_type(leaf, fi) == |
| 5099 | BTRFS_FILE_EXTENT_INLINE) |
| 5100 | continue; |
| 5101 | if (btrfs_file_extent_disk_bytenr(leaf, fi) == 0) |
| 5102 | continue; |
| 5103 | if (!inode || inode->i_ino != key.objectid) { |
| 5104 | iput(inode); |
| 5105 | inode = btrfs_ilookup(target_root->fs_info->sb, |
| 5106 | key.objectid, target_root, 1); |
| 5107 | } |
| 5108 | if (!inode) { |
| 5109 | skip_objectid = key.objectid; |
| 5110 | continue; |
| 5111 | } |
| 5112 | num_bytes = btrfs_file_extent_num_bytes(leaf, fi); |
| 5113 | |
| 5114 | lock_extent(&BTRFS_I(inode)->io_tree, key.offset, |
| 5115 | key.offset + num_bytes - 1, GFP_NOFS); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5116 | btrfs_drop_extent_cache(inode, key.offset, |
| 5117 | key.offset + num_bytes - 1, 1); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5118 | unlock_extent(&BTRFS_I(inode)->io_tree, key.offset, |
| 5119 | key.offset + num_bytes - 1, GFP_NOFS); |
| 5120 | cond_resched(); |
| 5121 | } |
| 5122 | iput(inode); |
| 5123 | return 0; |
| 5124 | } |
| 5125 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5126 | static noinline int replace_extents_in_leaf(struct btrfs_trans_handle *trans, |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5127 | struct btrfs_root *root, |
| 5128 | struct extent_buffer *leaf, |
| 5129 | struct btrfs_block_group_cache *group, |
| 5130 | struct inode *reloc_inode) |
| 5131 | { |
| 5132 | struct btrfs_key key; |
| 5133 | struct btrfs_key extent_key; |
| 5134 | struct btrfs_file_extent_item *fi; |
| 5135 | struct btrfs_leaf_ref *ref; |
| 5136 | struct disk_extent *new_extent; |
| 5137 | u64 bytenr; |
| 5138 | u64 num_bytes; |
| 5139 | u32 nritems; |
| 5140 | u32 i; |
| 5141 | int ext_index; |
| 5142 | int nr_extent; |
| 5143 | int ret; |
| 5144 | |
| 5145 | new_extent = kmalloc(sizeof(*new_extent), GFP_NOFS); |
| 5146 | BUG_ON(!new_extent); |
| 5147 | |
| 5148 | ref = btrfs_lookup_leaf_ref(root, leaf->start); |
| 5149 | BUG_ON(!ref); |
| 5150 | |
| 5151 | ext_index = -1; |
| 5152 | nritems = btrfs_header_nritems(leaf); |
| 5153 | for (i = 0; i < nritems; i++) { |
| 5154 | btrfs_item_key_to_cpu(leaf, &key, i); |
| 5155 | if (btrfs_key_type(&key) != BTRFS_EXTENT_DATA_KEY) |
| 5156 | continue; |
| 5157 | fi = btrfs_item_ptr(leaf, i, struct btrfs_file_extent_item); |
| 5158 | if (btrfs_file_extent_type(leaf, fi) == |
| 5159 | BTRFS_FILE_EXTENT_INLINE) |
| 5160 | continue; |
| 5161 | bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
| 5162 | num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi); |
| 5163 | if (bytenr == 0) |
| 5164 | continue; |
| 5165 | |
| 5166 | ext_index++; |
| 5167 | if (bytenr >= group->key.objectid + group->key.offset || |
| 5168 | bytenr + num_bytes <= group->key.objectid) |
| 5169 | continue; |
| 5170 | |
| 5171 | extent_key.objectid = bytenr; |
| 5172 | extent_key.offset = num_bytes; |
| 5173 | extent_key.type = BTRFS_EXTENT_ITEM_KEY; |
| 5174 | nr_extent = 1; |
| 5175 | ret = get_new_locations(reloc_inode, &extent_key, |
| 5176 | group->key.objectid, 1, |
| 5177 | &new_extent, &nr_extent); |
| 5178 | if (ret > 0) |
| 5179 | continue; |
| 5180 | BUG_ON(ret < 0); |
| 5181 | |
| 5182 | BUG_ON(ref->extents[ext_index].bytenr != bytenr); |
| 5183 | BUG_ON(ref->extents[ext_index].num_bytes != num_bytes); |
| 5184 | ref->extents[ext_index].bytenr = new_extent->disk_bytenr; |
| 5185 | ref->extents[ext_index].num_bytes = new_extent->disk_num_bytes; |
| 5186 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5187 | btrfs_set_file_extent_disk_bytenr(leaf, fi, |
| 5188 | new_extent->disk_bytenr); |
| 5189 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, |
| 5190 | new_extent->disk_num_bytes); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5191 | btrfs_mark_buffer_dirty(leaf); |
| 5192 | |
| 5193 | ret = btrfs_inc_extent_ref(trans, root, |
| 5194 | new_extent->disk_bytenr, |
| 5195 | new_extent->disk_num_bytes, |
| 5196 | leaf->start, |
| 5197 | root->root_key.objectid, |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 5198 | trans->transid, key.objectid); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5199 | BUG_ON(ret); |
| 5200 | ret = btrfs_free_extent(trans, root, |
| 5201 | bytenr, num_bytes, leaf->start, |
| 5202 | btrfs_header_owner(leaf), |
| 5203 | btrfs_header_generation(leaf), |
Yan Zheng | 3bb1a1b | 2008-10-09 11:46:24 -0400 | [diff] [blame] | 5204 | key.objectid, 0); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5205 | BUG_ON(ret); |
| 5206 | cond_resched(); |
| 5207 | } |
| 5208 | kfree(new_extent); |
| 5209 | BUG_ON(ext_index + 1 != ref->nritems); |
| 5210 | btrfs_free_leaf_ref(root, ref); |
| 5211 | return 0; |
| 5212 | } |
| 5213 | |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5214 | int btrfs_free_reloc_root(struct btrfs_trans_handle *trans, |
| 5215 | struct btrfs_root *root) |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5216 | { |
| 5217 | struct btrfs_root *reloc_root; |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5218 | int ret; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5219 | |
| 5220 | if (root->reloc_root) { |
| 5221 | reloc_root = root->reloc_root; |
| 5222 | root->reloc_root = NULL; |
| 5223 | list_add(&reloc_root->dead_list, |
| 5224 | &root->fs_info->dead_reloc_roots); |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5225 | |
| 5226 | btrfs_set_root_bytenr(&reloc_root->root_item, |
| 5227 | reloc_root->node->start); |
| 5228 | btrfs_set_root_level(&root->root_item, |
| 5229 | btrfs_header_level(reloc_root->node)); |
| 5230 | memset(&reloc_root->root_item.drop_progress, 0, |
| 5231 | sizeof(struct btrfs_disk_key)); |
| 5232 | reloc_root->root_item.drop_level = 0; |
| 5233 | |
| 5234 | ret = btrfs_update_root(trans, root->fs_info->tree_root, |
| 5235 | &reloc_root->root_key, |
| 5236 | &reloc_root->root_item); |
| 5237 | BUG_ON(ret); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5238 | } |
| 5239 | return 0; |
| 5240 | } |
| 5241 | |
| 5242 | int btrfs_drop_dead_reloc_roots(struct btrfs_root *root) |
| 5243 | { |
| 5244 | struct btrfs_trans_handle *trans; |
| 5245 | struct btrfs_root *reloc_root; |
| 5246 | struct btrfs_root *prev_root = NULL; |
| 5247 | struct list_head dead_roots; |
| 5248 | int ret; |
| 5249 | unsigned long nr; |
| 5250 | |
| 5251 | INIT_LIST_HEAD(&dead_roots); |
| 5252 | list_splice_init(&root->fs_info->dead_reloc_roots, &dead_roots); |
| 5253 | |
| 5254 | while (!list_empty(&dead_roots)) { |
| 5255 | reloc_root = list_entry(dead_roots.prev, |
| 5256 | struct btrfs_root, dead_list); |
| 5257 | list_del_init(&reloc_root->dead_list); |
| 5258 | |
| 5259 | BUG_ON(reloc_root->commit_root != NULL); |
| 5260 | while (1) { |
| 5261 | trans = btrfs_join_transaction(root, 1); |
| 5262 | BUG_ON(!trans); |
| 5263 | |
| 5264 | mutex_lock(&root->fs_info->drop_mutex); |
| 5265 | ret = btrfs_drop_snapshot(trans, reloc_root); |
| 5266 | if (ret != -EAGAIN) |
| 5267 | break; |
| 5268 | mutex_unlock(&root->fs_info->drop_mutex); |
| 5269 | |
| 5270 | nr = trans->blocks_used; |
| 5271 | ret = btrfs_end_transaction(trans, root); |
| 5272 | BUG_ON(ret); |
| 5273 | btrfs_btree_balance_dirty(root, nr); |
| 5274 | } |
| 5275 | |
| 5276 | free_extent_buffer(reloc_root->node); |
| 5277 | |
| 5278 | ret = btrfs_del_root(trans, root->fs_info->tree_root, |
| 5279 | &reloc_root->root_key); |
| 5280 | BUG_ON(ret); |
| 5281 | mutex_unlock(&root->fs_info->drop_mutex); |
| 5282 | |
| 5283 | nr = trans->blocks_used; |
| 5284 | ret = btrfs_end_transaction(trans, root); |
| 5285 | BUG_ON(ret); |
| 5286 | btrfs_btree_balance_dirty(root, nr); |
| 5287 | |
| 5288 | kfree(prev_root); |
| 5289 | prev_root = reloc_root; |
| 5290 | } |
| 5291 | if (prev_root) { |
| 5292 | btrfs_remove_leaf_refs(prev_root, (u64)-1, 0); |
| 5293 | kfree(prev_root); |
| 5294 | } |
| 5295 | return 0; |
| 5296 | } |
| 5297 | |
| 5298 | int btrfs_add_dead_reloc_root(struct btrfs_root *root) |
| 5299 | { |
| 5300 | list_add(&root->dead_list, &root->fs_info->dead_reloc_roots); |
| 5301 | return 0; |
| 5302 | } |
| 5303 | |
| 5304 | int btrfs_cleanup_reloc_trees(struct btrfs_root *root) |
| 5305 | { |
| 5306 | struct btrfs_root *reloc_root; |
| 5307 | struct btrfs_trans_handle *trans; |
| 5308 | struct btrfs_key location; |
| 5309 | int found; |
| 5310 | int ret; |
| 5311 | |
| 5312 | mutex_lock(&root->fs_info->tree_reloc_mutex); |
| 5313 | ret = btrfs_find_dead_roots(root, BTRFS_TREE_RELOC_OBJECTID, NULL); |
| 5314 | BUG_ON(ret); |
| 5315 | found = !list_empty(&root->fs_info->dead_reloc_roots); |
| 5316 | mutex_unlock(&root->fs_info->tree_reloc_mutex); |
| 5317 | |
| 5318 | if (found) { |
| 5319 | trans = btrfs_start_transaction(root, 1); |
| 5320 | BUG_ON(!trans); |
| 5321 | ret = btrfs_commit_transaction(trans, root); |
| 5322 | BUG_ON(ret); |
| 5323 | } |
| 5324 | |
| 5325 | location.objectid = BTRFS_DATA_RELOC_TREE_OBJECTID; |
| 5326 | location.offset = (u64)-1; |
| 5327 | location.type = BTRFS_ROOT_ITEM_KEY; |
| 5328 | |
| 5329 | reloc_root = btrfs_read_fs_root_no_name(root->fs_info, &location); |
| 5330 | BUG_ON(!reloc_root); |
| 5331 | btrfs_orphan_cleanup(reloc_root); |
| 5332 | return 0; |
| 5333 | } |
| 5334 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5335 | static noinline int init_reloc_tree(struct btrfs_trans_handle *trans, |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5336 | struct btrfs_root *root) |
| 5337 | { |
| 5338 | struct btrfs_root *reloc_root; |
| 5339 | struct extent_buffer *eb; |
| 5340 | struct btrfs_root_item *root_item; |
| 5341 | struct btrfs_key root_key; |
| 5342 | int ret; |
| 5343 | |
| 5344 | BUG_ON(!root->ref_cows); |
| 5345 | if (root->reloc_root) |
| 5346 | return 0; |
| 5347 | |
| 5348 | root_item = kmalloc(sizeof(*root_item), GFP_NOFS); |
| 5349 | BUG_ON(!root_item); |
| 5350 | |
| 5351 | ret = btrfs_copy_root(trans, root, root->commit_root, |
| 5352 | &eb, BTRFS_TREE_RELOC_OBJECTID); |
| 5353 | BUG_ON(ret); |
| 5354 | |
| 5355 | root_key.objectid = BTRFS_TREE_RELOC_OBJECTID; |
| 5356 | root_key.offset = root->root_key.objectid; |
| 5357 | root_key.type = BTRFS_ROOT_ITEM_KEY; |
| 5358 | |
| 5359 | memcpy(root_item, &root->root_item, sizeof(root_item)); |
| 5360 | btrfs_set_root_refs(root_item, 0); |
| 5361 | btrfs_set_root_bytenr(root_item, eb->start); |
| 5362 | btrfs_set_root_level(root_item, btrfs_header_level(eb)); |
Yan Zheng | 84234f3 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5363 | btrfs_set_root_generation(root_item, trans->transid); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5364 | |
| 5365 | btrfs_tree_unlock(eb); |
| 5366 | free_extent_buffer(eb); |
| 5367 | |
| 5368 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, |
| 5369 | &root_key, root_item); |
| 5370 | BUG_ON(ret); |
| 5371 | kfree(root_item); |
| 5372 | |
| 5373 | reloc_root = btrfs_read_fs_root_no_radix(root->fs_info->tree_root, |
| 5374 | &root_key); |
| 5375 | BUG_ON(!reloc_root); |
| 5376 | reloc_root->last_trans = trans->transid; |
| 5377 | reloc_root->commit_root = NULL; |
| 5378 | reloc_root->ref_tree = &root->fs_info->reloc_ref_tree; |
| 5379 | |
| 5380 | root->reloc_root = reloc_root; |
| 5381 | return 0; |
| 5382 | } |
| 5383 | |
| 5384 | /* |
| 5385 | * Core function of space balance. |
| 5386 | * |
| 5387 | * The idea is using reloc trees to relocate tree blocks in reference |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5388 | * counted roots. There is one reloc tree for each subvol, and all |
| 5389 | * reloc trees share same root key objectid. Reloc trees are snapshots |
| 5390 | * of the latest committed roots of subvols (root->commit_root). |
| 5391 | * |
| 5392 | * To relocate a tree block referenced by a subvol, there are two steps. |
| 5393 | * COW the block through subvol's reloc tree, then update block pointer |
| 5394 | * in the subvol to point to the new block. Since all reloc trees share |
| 5395 | * same root key objectid, doing special handing for tree blocks owned |
| 5396 | * by them is easy. Once a tree block has been COWed in one reloc tree, |
| 5397 | * we can use the resulting new block directly when the same block is |
| 5398 | * required to COW again through other reloc trees. By this way, relocated |
| 5399 | * tree blocks are shared between reloc trees, so they are also shared |
| 5400 | * between subvols. |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5401 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5402 | static noinline int relocate_one_path(struct btrfs_trans_handle *trans, |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5403 | struct btrfs_root *root, |
| 5404 | struct btrfs_path *path, |
| 5405 | struct btrfs_key *first_key, |
| 5406 | struct btrfs_ref_path *ref_path, |
| 5407 | struct btrfs_block_group_cache *group, |
| 5408 | struct inode *reloc_inode) |
| 5409 | { |
| 5410 | struct btrfs_root *reloc_root; |
| 5411 | struct extent_buffer *eb = NULL; |
| 5412 | struct btrfs_key *keys; |
| 5413 | u64 *nodes; |
| 5414 | int level; |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5415 | int shared_level; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5416 | int lowest_level = 0; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5417 | int ret; |
| 5418 | |
| 5419 | if (ref_path->owner_objectid < BTRFS_FIRST_FREE_OBJECTID) |
| 5420 | lowest_level = ref_path->owner_objectid; |
| 5421 | |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5422 | if (!root->ref_cows) { |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5423 | path->lowest_level = lowest_level; |
| 5424 | ret = btrfs_search_slot(trans, root, first_key, path, 0, 1); |
| 5425 | BUG_ON(ret < 0); |
| 5426 | path->lowest_level = 0; |
| 5427 | btrfs_release_path(root, path); |
| 5428 | return 0; |
| 5429 | } |
| 5430 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5431 | mutex_lock(&root->fs_info->tree_reloc_mutex); |
| 5432 | ret = init_reloc_tree(trans, root); |
| 5433 | BUG_ON(ret); |
| 5434 | reloc_root = root->reloc_root; |
| 5435 | |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5436 | shared_level = ref_path->shared_level; |
| 5437 | ref_path->shared_level = BTRFS_MAX_LEVEL - 1; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5438 | |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5439 | keys = ref_path->node_keys; |
| 5440 | nodes = ref_path->new_nodes; |
| 5441 | memset(&keys[shared_level + 1], 0, |
| 5442 | sizeof(*keys) * (BTRFS_MAX_LEVEL - shared_level - 1)); |
| 5443 | memset(&nodes[shared_level + 1], 0, |
| 5444 | sizeof(*nodes) * (BTRFS_MAX_LEVEL - shared_level - 1)); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5445 | |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5446 | if (nodes[lowest_level] == 0) { |
| 5447 | path->lowest_level = lowest_level; |
| 5448 | ret = btrfs_search_slot(trans, reloc_root, first_key, path, |
| 5449 | 0, 1); |
| 5450 | BUG_ON(ret); |
| 5451 | for (level = lowest_level; level < BTRFS_MAX_LEVEL; level++) { |
| 5452 | eb = path->nodes[level]; |
| 5453 | if (!eb || eb == reloc_root->node) |
| 5454 | break; |
| 5455 | nodes[level] = eb->start; |
| 5456 | if (level == 0) |
| 5457 | btrfs_item_key_to_cpu(eb, &keys[level], 0); |
| 5458 | else |
| 5459 | btrfs_node_key_to_cpu(eb, &keys[level], 0); |
| 5460 | } |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 5461 | if (nodes[0] && |
| 5462 | ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5463 | eb = path->nodes[0]; |
| 5464 | ret = replace_extents_in_leaf(trans, reloc_root, eb, |
| 5465 | group, reloc_inode); |
| 5466 | BUG_ON(ret); |
| 5467 | } |
| 5468 | btrfs_release_path(reloc_root, path); |
| 5469 | } else { |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5470 | ret = btrfs_merge_path(trans, reloc_root, keys, nodes, |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5471 | lowest_level); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5472 | BUG_ON(ret); |
| 5473 | } |
| 5474 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5475 | /* |
| 5476 | * replace tree blocks in the fs tree with tree blocks in |
| 5477 | * the reloc tree. |
| 5478 | */ |
| 5479 | ret = btrfs_merge_path(trans, root, keys, nodes, lowest_level); |
| 5480 | BUG_ON(ret < 0); |
| 5481 | |
| 5482 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5483 | ret = btrfs_search_slot(trans, reloc_root, first_key, path, |
| 5484 | 0, 0); |
| 5485 | BUG_ON(ret); |
| 5486 | extent_buffer_get(path->nodes[0]); |
| 5487 | eb = path->nodes[0]; |
| 5488 | btrfs_release_path(reloc_root, path); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5489 | ret = invalidate_extent_cache(reloc_root, eb, group, root); |
| 5490 | BUG_ON(ret); |
| 5491 | free_extent_buffer(eb); |
| 5492 | } |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5493 | |
Yan Zheng | f82d02d | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 5494 | mutex_unlock(&root->fs_info->tree_reloc_mutex); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5495 | path->lowest_level = 0; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5496 | return 0; |
| 5497 | } |
| 5498 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5499 | static noinline int relocate_tree_block(struct btrfs_trans_handle *trans, |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5500 | struct btrfs_root *root, |
| 5501 | struct btrfs_path *path, |
| 5502 | struct btrfs_key *first_key, |
| 5503 | struct btrfs_ref_path *ref_path) |
| 5504 | { |
| 5505 | int ret; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5506 | |
| 5507 | ret = relocate_one_path(trans, root, path, first_key, |
| 5508 | ref_path, NULL, NULL); |
| 5509 | BUG_ON(ret); |
| 5510 | |
| 5511 | if (root == root->fs_info->extent_root) |
| 5512 | btrfs_extent_post_op(trans, root); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5513 | |
| 5514 | return 0; |
| 5515 | } |
| 5516 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5517 | static noinline int del_extent_zero(struct btrfs_trans_handle *trans, |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5518 | struct btrfs_root *extent_root, |
| 5519 | struct btrfs_path *path, |
| 5520 | struct btrfs_key *extent_key) |
| 5521 | { |
| 5522 | int ret; |
| 5523 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5524 | ret = btrfs_search_slot(trans, extent_root, extent_key, path, -1, 1); |
| 5525 | if (ret) |
| 5526 | goto out; |
| 5527 | ret = btrfs_del_item(trans, extent_root, path); |
| 5528 | out: |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5529 | btrfs_release_path(extent_root, path); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5530 | return ret; |
| 5531 | } |
| 5532 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5533 | static noinline struct btrfs_root *read_ref_root(struct btrfs_fs_info *fs_info, |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5534 | struct btrfs_ref_path *ref_path) |
| 5535 | { |
| 5536 | struct btrfs_key root_key; |
| 5537 | |
| 5538 | root_key.objectid = ref_path->root_objectid; |
| 5539 | root_key.type = BTRFS_ROOT_ITEM_KEY; |
| 5540 | if (is_cowonly_root(ref_path->root_objectid)) |
| 5541 | root_key.offset = 0; |
| 5542 | else |
| 5543 | root_key.offset = (u64)-1; |
| 5544 | |
| 5545 | return btrfs_read_fs_root_no_name(fs_info, &root_key); |
| 5546 | } |
| 5547 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5548 | static noinline int relocate_one_extent(struct btrfs_root *extent_root, |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5549 | struct btrfs_path *path, |
| 5550 | struct btrfs_key *extent_key, |
| 5551 | struct btrfs_block_group_cache *group, |
| 5552 | struct inode *reloc_inode, int pass) |
| 5553 | { |
| 5554 | struct btrfs_trans_handle *trans; |
| 5555 | struct btrfs_root *found_root; |
| 5556 | struct btrfs_ref_path *ref_path = NULL; |
| 5557 | struct disk_extent *new_extents = NULL; |
| 5558 | int nr_extents = 0; |
| 5559 | int loops; |
| 5560 | int ret; |
| 5561 | int level; |
| 5562 | struct btrfs_key first_key; |
| 5563 | u64 prev_block = 0; |
| 5564 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5565 | |
| 5566 | trans = btrfs_start_transaction(extent_root, 1); |
| 5567 | BUG_ON(!trans); |
| 5568 | |
| 5569 | if (extent_key->objectid == 0) { |
| 5570 | ret = del_extent_zero(trans, extent_root, path, extent_key); |
| 5571 | goto out; |
| 5572 | } |
| 5573 | |
| 5574 | ref_path = kmalloc(sizeof(*ref_path), GFP_NOFS); |
| 5575 | if (!ref_path) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5576 | ret = -ENOMEM; |
| 5577 | goto out; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5578 | } |
| 5579 | |
| 5580 | for (loops = 0; ; loops++) { |
| 5581 | if (loops == 0) { |
| 5582 | ret = btrfs_first_ref_path(trans, extent_root, ref_path, |
| 5583 | extent_key->objectid); |
| 5584 | } else { |
| 5585 | ret = btrfs_next_ref_path(trans, extent_root, ref_path); |
| 5586 | } |
| 5587 | if (ret < 0) |
| 5588 | goto out; |
| 5589 | if (ret > 0) |
| 5590 | break; |
| 5591 | |
| 5592 | if (ref_path->root_objectid == BTRFS_TREE_LOG_OBJECTID || |
| 5593 | ref_path->root_objectid == BTRFS_TREE_RELOC_OBJECTID) |
| 5594 | continue; |
| 5595 | |
| 5596 | found_root = read_ref_root(extent_root->fs_info, ref_path); |
| 5597 | BUG_ON(!found_root); |
| 5598 | /* |
| 5599 | * for reference counted tree, only process reference paths |
| 5600 | * rooted at the latest committed root. |
| 5601 | */ |
| 5602 | if (found_root->ref_cows && |
| 5603 | ref_path->root_generation != found_root->root_key.offset) |
| 5604 | continue; |
| 5605 | |
| 5606 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { |
| 5607 | if (pass == 0) { |
| 5608 | /* |
| 5609 | * copy data extents to new locations |
| 5610 | */ |
| 5611 | u64 group_start = group->key.objectid; |
| 5612 | ret = relocate_data_extent(reloc_inode, |
| 5613 | extent_key, |
| 5614 | group_start); |
| 5615 | if (ret < 0) |
| 5616 | goto out; |
| 5617 | break; |
| 5618 | } |
| 5619 | level = 0; |
| 5620 | } else { |
| 5621 | level = ref_path->owner_objectid; |
| 5622 | } |
| 5623 | |
| 5624 | if (prev_block != ref_path->nodes[level]) { |
| 5625 | struct extent_buffer *eb; |
| 5626 | u64 block_start = ref_path->nodes[level]; |
| 5627 | u64 block_size = btrfs_level_size(found_root, level); |
| 5628 | |
| 5629 | eb = read_tree_block(found_root, block_start, |
| 5630 | block_size, 0); |
| 5631 | btrfs_tree_lock(eb); |
| 5632 | BUG_ON(level != btrfs_header_level(eb)); |
| 5633 | |
| 5634 | if (level == 0) |
| 5635 | btrfs_item_key_to_cpu(eb, &first_key, 0); |
| 5636 | else |
| 5637 | btrfs_node_key_to_cpu(eb, &first_key, 0); |
| 5638 | |
| 5639 | btrfs_tree_unlock(eb); |
| 5640 | free_extent_buffer(eb); |
| 5641 | prev_block = block_start; |
| 5642 | } |
| 5643 | |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 5644 | btrfs_record_root_in_trans(found_root); |
| 5645 | if (ref_path->owner_objectid >= BTRFS_FIRST_FREE_OBJECTID) { |
| 5646 | /* |
| 5647 | * try to update data extent references while |
| 5648 | * keeping metadata shared between snapshots. |
| 5649 | */ |
| 5650 | if (pass == 1) { |
| 5651 | ret = relocate_one_path(trans, found_root, |
| 5652 | path, &first_key, ref_path, |
| 5653 | group, reloc_inode); |
| 5654 | if (ret < 0) |
| 5655 | goto out; |
| 5656 | continue; |
| 5657 | } |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5658 | /* |
| 5659 | * use fallback method to process the remaining |
| 5660 | * references. |
| 5661 | */ |
| 5662 | if (!new_extents) { |
| 5663 | u64 group_start = group->key.objectid; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5664 | new_extents = kmalloc(sizeof(*new_extents), |
| 5665 | GFP_NOFS); |
| 5666 | nr_extents = 1; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5667 | ret = get_new_locations(reloc_inode, |
| 5668 | extent_key, |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5669 | group_start, 1, |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5670 | &new_extents, |
| 5671 | &nr_extents); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5672 | if (ret) |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5673 | goto out; |
| 5674 | } |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5675 | ret = replace_one_extent(trans, found_root, |
| 5676 | path, extent_key, |
| 5677 | &first_key, ref_path, |
| 5678 | new_extents, nr_extents); |
Yan Zheng | e4404d6 | 2008-12-12 10:03:26 -0500 | [diff] [blame] | 5679 | } else { |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5680 | ret = relocate_tree_block(trans, found_root, path, |
| 5681 | &first_key, ref_path); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5682 | } |
| 5683 | if (ret < 0) |
| 5684 | goto out; |
| 5685 | } |
| 5686 | ret = 0; |
| 5687 | out: |
| 5688 | btrfs_end_transaction(trans, extent_root); |
| 5689 | kfree(new_extents); |
| 5690 | kfree(ref_path); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5691 | return ret; |
| 5692 | } |
| 5693 | |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 5694 | static u64 update_block_group_flags(struct btrfs_root *root, u64 flags) |
| 5695 | { |
| 5696 | u64 num_devices; |
| 5697 | u64 stripped = BTRFS_BLOCK_GROUP_RAID0 | |
| 5698 | BTRFS_BLOCK_GROUP_RAID1 | BTRFS_BLOCK_GROUP_RAID10; |
| 5699 | |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 5700 | num_devices = root->fs_info->fs_devices->rw_devices; |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 5701 | if (num_devices == 1) { |
| 5702 | stripped |= BTRFS_BLOCK_GROUP_DUP; |
| 5703 | stripped = flags & ~stripped; |
| 5704 | |
| 5705 | /* turn raid0 into single device chunks */ |
| 5706 | if (flags & BTRFS_BLOCK_GROUP_RAID0) |
| 5707 | return stripped; |
| 5708 | |
| 5709 | /* turn mirroring into duplication */ |
| 5710 | if (flags & (BTRFS_BLOCK_GROUP_RAID1 | |
| 5711 | BTRFS_BLOCK_GROUP_RAID10)) |
| 5712 | return stripped | BTRFS_BLOCK_GROUP_DUP; |
| 5713 | return flags; |
| 5714 | } else { |
| 5715 | /* they already had raid on here, just return */ |
Chris Mason | ec44a35 | 2008-04-28 15:29:52 -0400 | [diff] [blame] | 5716 | if (flags & stripped) |
| 5717 | return flags; |
| 5718 | |
| 5719 | stripped |= BTRFS_BLOCK_GROUP_DUP; |
| 5720 | stripped = flags & ~stripped; |
| 5721 | |
| 5722 | /* switch duplicated blocks with raid1 */ |
| 5723 | if (flags & BTRFS_BLOCK_GROUP_DUP) |
| 5724 | return stripped | BTRFS_BLOCK_GROUP_RAID1; |
| 5725 | |
| 5726 | /* turn single device chunks into raid0 */ |
| 5727 | return stripped | BTRFS_BLOCK_GROUP_RAID0; |
| 5728 | } |
| 5729 | return flags; |
| 5730 | } |
| 5731 | |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 5732 | static int __alloc_chunk_for_shrink(struct btrfs_root *root, |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 5733 | struct btrfs_block_group_cache *shrink_block_group, |
| 5734 | int force) |
| 5735 | { |
| 5736 | struct btrfs_trans_handle *trans; |
| 5737 | u64 new_alloc_flags; |
| 5738 | u64 calc; |
| 5739 | |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 5740 | spin_lock(&shrink_block_group->lock); |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 5741 | if (btrfs_block_group_used(&shrink_block_group->item) > 0) { |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 5742 | spin_unlock(&shrink_block_group->lock); |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 5743 | |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 5744 | trans = btrfs_start_transaction(root, 1); |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 5745 | spin_lock(&shrink_block_group->lock); |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 5746 | |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 5747 | new_alloc_flags = update_block_group_flags(root, |
| 5748 | shrink_block_group->flags); |
| 5749 | if (new_alloc_flags != shrink_block_group->flags) { |
| 5750 | calc = |
| 5751 | btrfs_block_group_used(&shrink_block_group->item); |
| 5752 | } else { |
| 5753 | calc = shrink_block_group->key.offset; |
| 5754 | } |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 5755 | spin_unlock(&shrink_block_group->lock); |
| 5756 | |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 5757 | do_chunk_alloc(trans, root->fs_info->extent_root, |
| 5758 | calc + 2 * 1024 * 1024, new_alloc_flags, force); |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 5759 | |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 5760 | btrfs_end_transaction(trans, root); |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 5761 | } else |
| 5762 | spin_unlock(&shrink_block_group->lock); |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 5763 | return 0; |
| 5764 | } |
| 5765 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5766 | static int __insert_orphan_inode(struct btrfs_trans_handle *trans, |
| 5767 | struct btrfs_root *root, |
| 5768 | u64 objectid, u64 size) |
| 5769 | { |
| 5770 | struct btrfs_path *path; |
| 5771 | struct btrfs_inode_item *item; |
| 5772 | struct extent_buffer *leaf; |
| 5773 | int ret; |
| 5774 | |
| 5775 | path = btrfs_alloc_path(); |
| 5776 | if (!path) |
| 5777 | return -ENOMEM; |
| 5778 | |
| 5779 | ret = btrfs_insert_empty_inode(trans, root, path, objectid); |
| 5780 | if (ret) |
| 5781 | goto out; |
| 5782 | |
| 5783 | leaf = path->nodes[0]; |
| 5784 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_inode_item); |
| 5785 | memset_extent_buffer(leaf, 0, (unsigned long)item, sizeof(*item)); |
| 5786 | btrfs_set_inode_generation(leaf, item, 1); |
| 5787 | btrfs_set_inode_size(leaf, item, size); |
| 5788 | btrfs_set_inode_mode(leaf, item, S_IFREG | 0600); |
Yan Zheng | 0403e47 | 2008-12-10 20:32:51 -0500 | [diff] [blame] | 5789 | btrfs_set_inode_flags(leaf, item, BTRFS_INODE_NOCOMPRESS); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5790 | btrfs_mark_buffer_dirty(leaf); |
| 5791 | btrfs_release_path(root, path); |
| 5792 | out: |
| 5793 | btrfs_free_path(path); |
| 5794 | return ret; |
| 5795 | } |
| 5796 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5797 | static noinline struct inode *create_reloc_inode(struct btrfs_fs_info *fs_info, |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5798 | struct btrfs_block_group_cache *group) |
| 5799 | { |
| 5800 | struct inode *inode = NULL; |
| 5801 | struct btrfs_trans_handle *trans; |
| 5802 | struct btrfs_root *root; |
| 5803 | struct btrfs_key root_key; |
| 5804 | u64 objectid = BTRFS_FIRST_FREE_OBJECTID; |
| 5805 | int err = 0; |
| 5806 | |
| 5807 | root_key.objectid = BTRFS_DATA_RELOC_TREE_OBJECTID; |
| 5808 | root_key.type = BTRFS_ROOT_ITEM_KEY; |
| 5809 | root_key.offset = (u64)-1; |
| 5810 | root = btrfs_read_fs_root_no_name(fs_info, &root_key); |
| 5811 | if (IS_ERR(root)) |
| 5812 | return ERR_CAST(root); |
| 5813 | |
| 5814 | trans = btrfs_start_transaction(root, 1); |
| 5815 | BUG_ON(!trans); |
| 5816 | |
| 5817 | err = btrfs_find_free_objectid(trans, root, objectid, &objectid); |
| 5818 | if (err) |
| 5819 | goto out; |
| 5820 | |
| 5821 | err = __insert_orphan_inode(trans, root, objectid, group->key.offset); |
| 5822 | BUG_ON(err); |
| 5823 | |
| 5824 | err = btrfs_insert_file_extent(trans, root, objectid, 0, 0, 0, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 5825 | group->key.offset, 0, group->key.offset, |
| 5826 | 0, 0, 0); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5827 | BUG_ON(err); |
| 5828 | |
| 5829 | inode = btrfs_iget_locked(root->fs_info->sb, objectid, root); |
| 5830 | if (inode->i_state & I_NEW) { |
| 5831 | BTRFS_I(inode)->root = root; |
| 5832 | BTRFS_I(inode)->location.objectid = objectid; |
| 5833 | BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY; |
| 5834 | BTRFS_I(inode)->location.offset = 0; |
| 5835 | btrfs_read_locked_inode(inode); |
| 5836 | unlock_new_inode(inode); |
| 5837 | BUG_ON(is_bad_inode(inode)); |
| 5838 | } else { |
| 5839 | BUG_ON(1); |
| 5840 | } |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 5841 | BTRFS_I(inode)->index_cnt = group->key.objectid; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5842 | |
| 5843 | err = btrfs_orphan_add(trans, inode); |
| 5844 | out: |
| 5845 | btrfs_end_transaction(trans, root); |
| 5846 | if (err) { |
| 5847 | if (inode) |
| 5848 | iput(inode); |
| 5849 | inode = ERR_PTR(err); |
| 5850 | } |
| 5851 | return inode; |
| 5852 | } |
| 5853 | |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 5854 | int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len) |
| 5855 | { |
| 5856 | |
| 5857 | struct btrfs_ordered_sum *sums; |
| 5858 | struct btrfs_sector_sum *sector_sum; |
| 5859 | struct btrfs_ordered_extent *ordered; |
| 5860 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 5861 | struct list_head list; |
| 5862 | size_t offset; |
| 5863 | int ret; |
| 5864 | u64 disk_bytenr; |
| 5865 | |
| 5866 | INIT_LIST_HEAD(&list); |
| 5867 | |
| 5868 | ordered = btrfs_lookup_ordered_extent(inode, file_pos); |
| 5869 | BUG_ON(ordered->file_offset != file_pos || ordered->len != len); |
| 5870 | |
| 5871 | disk_bytenr = file_pos + BTRFS_I(inode)->index_cnt; |
Yan Zheng | 07d400a | 2009-01-06 11:42:00 -0500 | [diff] [blame] | 5872 | ret = btrfs_lookup_csums_range(root->fs_info->csum_root, disk_bytenr, |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 5873 | disk_bytenr + len - 1, &list); |
| 5874 | |
| 5875 | while (!list_empty(&list)) { |
| 5876 | sums = list_entry(list.next, struct btrfs_ordered_sum, list); |
| 5877 | list_del_init(&sums->list); |
| 5878 | |
| 5879 | sector_sum = sums->sums; |
| 5880 | sums->bytenr = ordered->start; |
| 5881 | |
| 5882 | offset = 0; |
| 5883 | while (offset < sums->len) { |
| 5884 | sector_sum->bytenr += ordered->start - disk_bytenr; |
| 5885 | sector_sum++; |
| 5886 | offset += root->sectorsize; |
| 5887 | } |
| 5888 | |
| 5889 | btrfs_add_ordered_sum(inode, ordered, sums); |
| 5890 | } |
| 5891 | btrfs_put_ordered_extent(ordered); |
| 5892 | return 0; |
| 5893 | } |
| 5894 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5895 | int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start) |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5896 | { |
| 5897 | struct btrfs_trans_handle *trans; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5898 | struct btrfs_path *path; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5899 | struct btrfs_fs_info *info = root->fs_info; |
| 5900 | struct extent_buffer *leaf; |
| 5901 | struct inode *reloc_inode; |
| 5902 | struct btrfs_block_group_cache *block_group; |
| 5903 | struct btrfs_key key; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5904 | u64 skipped; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5905 | u64 cur_byte; |
| 5906 | u64 total_found; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5907 | u32 nritems; |
| 5908 | int ret; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 5909 | int progress; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5910 | int pass = 0; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5911 | |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5912 | root = root->fs_info->extent_root; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5913 | |
| 5914 | block_group = btrfs_lookup_block_group(info, group_start); |
| 5915 | BUG_ON(!block_group); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5916 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5917 | printk(KERN_INFO "btrfs relocating block group %llu flags %llu\n", |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5918 | (unsigned long long)block_group->key.objectid, |
| 5919 | (unsigned long long)block_group->flags); |
Chris Mason | 323da79 | 2008-05-09 11:46:48 -0400 | [diff] [blame] | 5920 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5921 | path = btrfs_alloc_path(); |
| 5922 | BUG_ON(!path); |
Chris Mason | 323da79 | 2008-05-09 11:46:48 -0400 | [diff] [blame] | 5923 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5924 | reloc_inode = create_reloc_inode(info, block_group); |
| 5925 | BUG_ON(IS_ERR(reloc_inode)); |
| 5926 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5927 | __alloc_chunk_for_shrink(root, block_group, 1); |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 5928 | set_block_group_readonly(block_group); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5929 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5930 | btrfs_start_delalloc_inodes(info->tree_root); |
| 5931 | btrfs_wait_ordered_extents(info->tree_root, 0); |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 5932 | again: |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5933 | skipped = 0; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5934 | total_found = 0; |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 5935 | progress = 0; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5936 | key.objectid = block_group->key.objectid; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5937 | key.offset = 0; |
| 5938 | key.type = 0; |
Yan | 73e48b2 | 2008-01-03 14:14:39 -0500 | [diff] [blame] | 5939 | cur_byte = key.objectid; |
Chris Mason | 4313b39 | 2008-01-03 09:08:48 -0500 | [diff] [blame] | 5940 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5941 | trans = btrfs_start_transaction(info->tree_root, 1); |
| 5942 | btrfs_commit_transaction(trans, info->tree_root); |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 5943 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5944 | mutex_lock(&root->fs_info->cleaner_mutex); |
| 5945 | btrfs_clean_old_snapshots(info->tree_root); |
| 5946 | btrfs_remove_leaf_refs(info->tree_root, (u64)-1, 1); |
| 5947 | mutex_unlock(&root->fs_info->cleaner_mutex); |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 5948 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5949 | while (1) { |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5950 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 5951 | if (ret < 0) |
| 5952 | goto out; |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 5953 | next: |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5954 | leaf = path->nodes[0]; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5955 | nritems = btrfs_header_nritems(leaf); |
Yan | 73e48b2 | 2008-01-03 14:14:39 -0500 | [diff] [blame] | 5956 | if (path->slots[0] >= nritems) { |
| 5957 | ret = btrfs_next_leaf(root, path); |
| 5958 | if (ret < 0) |
| 5959 | goto out; |
| 5960 | if (ret == 1) { |
| 5961 | ret = 0; |
| 5962 | break; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5963 | } |
Yan | 73e48b2 | 2008-01-03 14:14:39 -0500 | [diff] [blame] | 5964 | leaf = path->nodes[0]; |
| 5965 | nritems = btrfs_header_nritems(leaf); |
| 5966 | } |
| 5967 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5968 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
Chris Mason | 725c846 | 2008-01-04 16:47:16 -0500 | [diff] [blame] | 5969 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5970 | if (key.objectid >= block_group->key.objectid + |
| 5971 | block_group->key.offset) |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 5972 | break; |
| 5973 | |
Chris Mason | 725c846 | 2008-01-04 16:47:16 -0500 | [diff] [blame] | 5974 | if (progress && need_resched()) { |
Chris Mason | 725c846 | 2008-01-04 16:47:16 -0500 | [diff] [blame] | 5975 | btrfs_release_path(root, path); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5976 | cond_resched(); |
Chris Mason | 725c846 | 2008-01-04 16:47:16 -0500 | [diff] [blame] | 5977 | progress = 0; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5978 | continue; |
Chris Mason | 725c846 | 2008-01-04 16:47:16 -0500 | [diff] [blame] | 5979 | } |
| 5980 | progress = 1; |
| 5981 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5982 | if (btrfs_key_type(&key) != BTRFS_EXTENT_ITEM_KEY || |
| 5983 | key.objectid + key.offset <= cur_byte) { |
Yan | 73e48b2 | 2008-01-03 14:14:39 -0500 | [diff] [blame] | 5984 | path->slots[0]++; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5985 | goto next; |
| 5986 | } |
Yan | 73e48b2 | 2008-01-03 14:14:39 -0500 | [diff] [blame] | 5987 | |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5988 | total_found++; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5989 | cur_byte = key.objectid + key.offset; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 5990 | btrfs_release_path(root, path); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5991 | |
| 5992 | __alloc_chunk_for_shrink(root, block_group, 0); |
| 5993 | ret = relocate_one_extent(root, path, &key, block_group, |
| 5994 | reloc_inode, pass); |
| 5995 | BUG_ON(ret < 0); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5996 | if (ret > 0) |
| 5997 | skipped++; |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 5998 | |
| 5999 | key.objectid = cur_byte; |
| 6000 | key.type = 0; |
| 6001 | key.offset = 0; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 6002 | } |
| 6003 | |
| 6004 | btrfs_release_path(root, path); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 6005 | |
| 6006 | if (pass == 0) { |
| 6007 | btrfs_wait_ordered_range(reloc_inode, 0, (u64)-1); |
| 6008 | invalidate_mapping_pages(reloc_inode->i_mapping, 0, -1); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 6009 | } |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 6010 | |
| 6011 | if (total_found > 0) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 6012 | printk(KERN_INFO "btrfs found %llu extents in pass %d\n", |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 6013 | (unsigned long long)total_found, pass); |
| 6014 | pass++; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 6015 | if (total_found == skipped && pass > 2) { |
| 6016 | iput(reloc_inode); |
| 6017 | reloc_inode = create_reloc_inode(info, block_group); |
| 6018 | pass = 0; |
| 6019 | } |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 6020 | goto again; |
| 6021 | } |
| 6022 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 6023 | /* delete reloc_inode */ |
| 6024 | iput(reloc_inode); |
Chris Mason | 7d9eb12 | 2008-07-08 14:19:17 -0400 | [diff] [blame] | 6025 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 6026 | /* unpin extents in this range */ |
| 6027 | trans = btrfs_start_transaction(info->tree_root, 1); |
| 6028 | btrfs_commit_transaction(trans, info->tree_root); |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 6029 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 6030 | spin_lock(&block_group->lock); |
| 6031 | WARN_ON(block_group->pinned > 0); |
| 6032 | WARN_ON(block_group->reserved > 0); |
| 6033 | WARN_ON(btrfs_block_group_used(&block_group->item) > 0); |
| 6034 | spin_unlock(&block_group->lock); |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 6035 | put_block_group(block_group); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 6036 | ret = 0; |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 6037 | out: |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 6038 | btrfs_free_path(path); |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 6039 | return ret; |
| 6040 | } |
| 6041 | |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 6042 | static int find_first_block_group(struct btrfs_root *root, |
| 6043 | struct btrfs_path *path, struct btrfs_key *key) |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 6044 | { |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 6045 | int ret = 0; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 6046 | struct btrfs_key found_key; |
| 6047 | struct extent_buffer *leaf; |
| 6048 | int slot; |
| 6049 | |
| 6050 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); |
| 6051 | if (ret < 0) |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 6052 | goto out; |
| 6053 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 6054 | while (1) { |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 6055 | slot = path->slots[0]; |
| 6056 | leaf = path->nodes[0]; |
| 6057 | if (slot >= btrfs_header_nritems(leaf)) { |
| 6058 | ret = btrfs_next_leaf(root, path); |
| 6059 | if (ret == 0) |
| 6060 | continue; |
| 6061 | if (ret < 0) |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 6062 | goto out; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 6063 | break; |
| 6064 | } |
| 6065 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
| 6066 | |
| 6067 | if (found_key.objectid >= key->objectid && |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 6068 | found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { |
| 6069 | ret = 0; |
| 6070 | goto out; |
| 6071 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 6072 | path->slots[0]++; |
| 6073 | } |
| 6074 | ret = -ENOENT; |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 6075 | out: |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 6076 | return ret; |
| 6077 | } |
| 6078 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 6079 | int btrfs_free_block_groups(struct btrfs_fs_info *info) |
| 6080 | { |
| 6081 | struct btrfs_block_group_cache *block_group; |
| 6082 | struct rb_node *n; |
| 6083 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 6084 | spin_lock(&info->block_group_cache_lock); |
| 6085 | while ((n = rb_last(&info->block_group_cache_tree)) != NULL) { |
| 6086 | block_group = rb_entry(n, struct btrfs_block_group_cache, |
| 6087 | cache_node); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 6088 | rb_erase(&block_group->cache_node, |
| 6089 | &info->block_group_cache_tree); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 6090 | spin_unlock(&info->block_group_cache_lock); |
| 6091 | |
| 6092 | btrfs_remove_free_space_cache(block_group); |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 6093 | down_write(&block_group->space_info->groups_sem); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 6094 | list_del(&block_group->list); |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 6095 | up_write(&block_group->space_info->groups_sem); |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 6096 | |
| 6097 | WARN_ON(atomic_read(&block_group->count) != 1); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 6098 | kfree(block_group); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 6099 | |
| 6100 | spin_lock(&info->block_group_cache_lock); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 6101 | } |
| 6102 | spin_unlock(&info->block_group_cache_lock); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 6103 | return 0; |
| 6104 | } |
| 6105 | |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 6106 | int btrfs_read_block_groups(struct btrfs_root *root) |
| 6107 | { |
| 6108 | struct btrfs_path *path; |
| 6109 | int ret; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 6110 | struct btrfs_block_group_cache *cache; |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 6111 | struct btrfs_fs_info *info = root->fs_info; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 6112 | struct btrfs_space_info *space_info; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 6113 | struct btrfs_key key; |
| 6114 | struct btrfs_key found_key; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 6115 | struct extent_buffer *leaf; |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 6116 | |
Chris Mason | be74417 | 2007-05-06 10:15:01 -0400 | [diff] [blame] | 6117 | root = info->extent_root; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 6118 | key.objectid = 0; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 6119 | key.offset = 0; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 6120 | btrfs_set_key_type(&key, BTRFS_BLOCK_GROUP_ITEM_KEY); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 6121 | path = btrfs_alloc_path(); |
| 6122 | if (!path) |
| 6123 | return -ENOMEM; |
| 6124 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 6125 | while (1) { |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 6126 | ret = find_first_block_group(root, path, &key); |
| 6127 | if (ret > 0) { |
| 6128 | ret = 0; |
| 6129 | goto error; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 6130 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 6131 | if (ret != 0) |
| 6132 | goto error; |
| 6133 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 6134 | leaf = path->nodes[0]; |
| 6135 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 6136 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 6137 | if (!cache) { |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 6138 | ret = -ENOMEM; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 6139 | break; |
| 6140 | } |
Chris Mason | 3e1ad54 | 2007-05-07 20:03:49 -0400 | [diff] [blame] | 6141 | |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 6142 | atomic_set(&cache->count, 1); |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 6143 | spin_lock_init(&cache->lock); |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 6144 | mutex_init(&cache->alloc_mutex); |
Josef Bacik | ea6a478 | 2008-11-20 12:16:16 -0500 | [diff] [blame] | 6145 | mutex_init(&cache->cache_mutex); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6146 | INIT_LIST_HEAD(&cache->list); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 6147 | read_extent_buffer(leaf, &cache->item, |
| 6148 | btrfs_item_ptr_offset(leaf, path->slots[0]), |
| 6149 | sizeof(cache->item)); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 6150 | memcpy(&cache->key, &found_key, sizeof(found_key)); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 6151 | |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 6152 | key.objectid = found_key.objectid + found_key.offset; |
| 6153 | btrfs_release_path(root, path); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 6154 | cache->flags = btrfs_block_group_flags(&cache->item); |
Chris Mason | 96b5179 | 2007-10-15 16:15:19 -0400 | [diff] [blame] | 6155 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 6156 | ret = update_space_info(info, cache->flags, found_key.offset, |
| 6157 | btrfs_block_group_used(&cache->item), |
| 6158 | &space_info); |
| 6159 | BUG_ON(ret); |
| 6160 | cache->space_info = space_info; |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 6161 | down_write(&space_info->groups_sem); |
| 6162 | list_add_tail(&cache->list, &space_info->block_groups); |
| 6163 | up_write(&space_info->groups_sem); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 6164 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6165 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
| 6166 | BUG_ON(ret); |
Chris Mason | 75ccf47 | 2008-09-30 19:24:06 -0400 | [diff] [blame] | 6167 | |
| 6168 | set_avail_alloc_bits(root->fs_info, cache->flags); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 6169 | if (btrfs_chunk_readonly(root, cache->key.objectid)) |
| 6170 | set_block_group_readonly(cache); |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 6171 | } |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 6172 | ret = 0; |
| 6173 | error: |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 6174 | btrfs_free_path(path); |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 6175 | return ret; |
Chris Mason | 9078a3e | 2007-04-26 16:46:15 -0400 | [diff] [blame] | 6176 | } |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 6177 | |
| 6178 | int btrfs_make_block_group(struct btrfs_trans_handle *trans, |
| 6179 | struct btrfs_root *root, u64 bytes_used, |
Chris Mason | e17cade | 2008-04-15 15:41:47 -0400 | [diff] [blame] | 6180 | u64 type, u64 chunk_objectid, u64 chunk_offset, |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 6181 | u64 size) |
| 6182 | { |
| 6183 | int ret; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 6184 | struct btrfs_root *extent_root; |
| 6185 | struct btrfs_block_group_cache *cache; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 6186 | |
| 6187 | extent_root = root->fs_info->extent_root; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 6188 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 6189 | root->fs_info->last_trans_new_blockgroup = trans->transid; |
| 6190 | |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 6191 | cache = kzalloc(sizeof(*cache), GFP_NOFS); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6192 | if (!cache) |
| 6193 | return -ENOMEM; |
| 6194 | |
Chris Mason | e17cade | 2008-04-15 15:41:47 -0400 | [diff] [blame] | 6195 | cache->key.objectid = chunk_offset; |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 6196 | cache->key.offset = size; |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 6197 | cache->key.type = BTRFS_BLOCK_GROUP_ITEM_KEY; |
| 6198 | atomic_set(&cache->count, 1); |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 6199 | spin_lock_init(&cache->lock); |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 6200 | mutex_init(&cache->alloc_mutex); |
Josef Bacik | ea6a478 | 2008-11-20 12:16:16 -0500 | [diff] [blame] | 6201 | mutex_init(&cache->cache_mutex); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6202 | INIT_LIST_HEAD(&cache->list); |
Chris Mason | 0ef3e66 | 2008-05-24 14:04:53 -0400 | [diff] [blame] | 6203 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 6204 | btrfs_set_block_group_used(&cache->item, bytes_used); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 6205 | btrfs_set_block_group_chunk_objectid(&cache->item, chunk_objectid); |
| 6206 | cache->flags = type; |
| 6207 | btrfs_set_block_group_flags(&cache->item, type); |
| 6208 | |
| 6209 | ret = update_space_info(root->fs_info, cache->flags, size, bytes_used, |
| 6210 | &cache->space_info); |
| 6211 | BUG_ON(ret); |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 6212 | down_write(&cache->space_info->groups_sem); |
| 6213 | list_add_tail(&cache->list, &cache->space_info->block_groups); |
| 6214 | up_write(&cache->space_info->groups_sem); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 6215 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 6216 | ret = btrfs_add_block_group_cache(root->fs_info, cache); |
| 6217 | BUG_ON(ret); |
Chris Mason | c286ac4 | 2008-07-22 23:06:41 -0400 | [diff] [blame] | 6218 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 6219 | ret = btrfs_insert_item(trans, extent_root, &cache->key, &cache->item, |
| 6220 | sizeof(cache->item)); |
| 6221 | BUG_ON(ret); |
| 6222 | |
Chris Mason | 87ef2bb | 2008-10-30 11:23:27 -0400 | [diff] [blame] | 6223 | finish_current_insert(trans, extent_root, 0); |
| 6224 | ret = del_pending_extents(trans, extent_root, 0); |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 6225 | BUG_ON(ret); |
Chris Mason | d18a2c4 | 2008-04-04 15:40:00 -0400 | [diff] [blame] | 6226 | set_avail_alloc_bits(extent_root->fs_info, type); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 6227 | |
Chris Mason | 6324fbf | 2008-03-24 15:01:59 -0400 | [diff] [blame] | 6228 | return 0; |
| 6229 | } |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 6230 | |
| 6231 | int btrfs_remove_block_group(struct btrfs_trans_handle *trans, |
| 6232 | struct btrfs_root *root, u64 group_start) |
| 6233 | { |
| 6234 | struct btrfs_path *path; |
| 6235 | struct btrfs_block_group_cache *block_group; |
| 6236 | struct btrfs_key key; |
| 6237 | int ret; |
| 6238 | |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 6239 | root = root->fs_info->extent_root; |
| 6240 | |
| 6241 | block_group = btrfs_lookup_block_group(root->fs_info, group_start); |
| 6242 | BUG_ON(!block_group); |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 6243 | BUG_ON(!block_group->ro); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 6244 | |
| 6245 | memcpy(&key, &block_group->key, sizeof(key)); |
| 6246 | |
| 6247 | path = btrfs_alloc_path(); |
| 6248 | BUG_ON(!path); |
| 6249 | |
Yan Zheng | 3dfdb93 | 2009-01-21 10:49:16 -0500 | [diff] [blame] | 6250 | spin_lock(&root->fs_info->block_group_cache_lock); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 6251 | rb_erase(&block_group->cache_node, |
| 6252 | &root->fs_info->block_group_cache_tree); |
Yan Zheng | 3dfdb93 | 2009-01-21 10:49:16 -0500 | [diff] [blame] | 6253 | spin_unlock(&root->fs_info->block_group_cache_lock); |
| 6254 | btrfs_remove_free_space_cache(block_group); |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 6255 | down_write(&block_group->space_info->groups_sem); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 6256 | list_del(&block_group->list); |
Josef Bacik | 80eb234 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 6257 | up_write(&block_group->space_info->groups_sem); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 6258 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 6259 | spin_lock(&block_group->space_info->lock); |
| 6260 | block_group->space_info->total_bytes -= block_group->key.offset; |
| 6261 | block_group->space_info->bytes_readonly -= block_group->key.offset; |
| 6262 | spin_unlock(&block_group->space_info->lock); |
Yan Zheng | 2b82032 | 2008-11-17 21:11:30 -0500 | [diff] [blame] | 6263 | block_group->space_info->full = 0; |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 6264 | |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 6265 | put_block_group(block_group); |
| 6266 | put_block_group(block_group); |
Zheng Yan | 1a40e23 | 2008-09-26 10:09:34 -0400 | [diff] [blame] | 6267 | |
| 6268 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
| 6269 | if (ret > 0) |
| 6270 | ret = -EIO; |
| 6271 | if (ret < 0) |
| 6272 | goto out; |
| 6273 | |
| 6274 | ret = btrfs_del_item(trans, root, path); |
| 6275 | out: |
| 6276 | btrfs_free_path(path); |
| 6277 | return ret; |
| 6278 | } |