Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2008 Red Hat. 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 | */ |
| 18 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 19 | #include <linux/pagemap.h> |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 20 | #include <linux/sched.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 21 | #include <linux/slab.h> |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 22 | #include <linux/math64.h> |
Josef Bacik | 6ab6060 | 2011-08-08 08:24:46 -0400 | [diff] [blame] | 23 | #include <linux/ratelimit.h> |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 24 | #include "ctree.h" |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 25 | #include "free-space-cache.h" |
| 26 | #include "transaction.h" |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 27 | #include "disk-io.h" |
Josef Bacik | 43be214 | 2011-04-01 14:55:00 +0000 | [diff] [blame] | 28 | #include "extent_io.h" |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 29 | #include "inode-map.h" |
Filipe Manana | 0421682 | 2014-11-27 21:14:15 +0000 | [diff] [blame] | 30 | #include "volumes.h" |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 31 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 32 | #define BITS_PER_BITMAP (PAGE_CACHE_SIZE * 8) |
| 33 | #define MAX_CACHE_BYTES_PER_GIG (32 * 1024) |
| 34 | |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 35 | struct btrfs_trim_range { |
| 36 | u64 start; |
| 37 | u64 bytes; |
| 38 | struct list_head list; |
| 39 | }; |
| 40 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 41 | static int link_free_space(struct btrfs_free_space_ctl *ctl, |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 42 | struct btrfs_free_space *info); |
Josef Bacik | cd023e7 | 2012-05-14 10:06:40 -0400 | [diff] [blame] | 43 | static void unlink_free_space(struct btrfs_free_space_ctl *ctl, |
| 44 | struct btrfs_free_space *info); |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 45 | |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 46 | static struct inode *__lookup_free_space_inode(struct btrfs_root *root, |
| 47 | struct btrfs_path *path, |
| 48 | u64 offset) |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 49 | { |
| 50 | struct btrfs_key key; |
| 51 | struct btrfs_key location; |
| 52 | struct btrfs_disk_key disk_key; |
| 53 | struct btrfs_free_space_header *header; |
| 54 | struct extent_buffer *leaf; |
| 55 | struct inode *inode = NULL; |
| 56 | int ret; |
| 57 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 58 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 59 | key.offset = offset; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 60 | key.type = 0; |
| 61 | |
| 62 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 63 | if (ret < 0) |
| 64 | return ERR_PTR(ret); |
| 65 | if (ret > 0) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 66 | btrfs_release_path(path); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 67 | return ERR_PTR(-ENOENT); |
| 68 | } |
| 69 | |
| 70 | leaf = path->nodes[0]; |
| 71 | header = btrfs_item_ptr(leaf, path->slots[0], |
| 72 | struct btrfs_free_space_header); |
| 73 | btrfs_free_space_key(leaf, header, &disk_key); |
| 74 | btrfs_disk_key_to_cpu(&location, &disk_key); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 75 | btrfs_release_path(path); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 76 | |
| 77 | inode = btrfs_iget(root->fs_info->sb, &location, root, NULL); |
| 78 | if (!inode) |
| 79 | return ERR_PTR(-ENOENT); |
| 80 | if (IS_ERR(inode)) |
| 81 | return inode; |
| 82 | if (is_bad_inode(inode)) { |
| 83 | iput(inode); |
| 84 | return ERR_PTR(-ENOENT); |
| 85 | } |
| 86 | |
Al Viro | 528c032 | 2012-04-13 11:03:55 -0400 | [diff] [blame] | 87 | mapping_set_gfp_mask(inode->i_mapping, |
Chris Mason | 2b10826 | 2015-04-06 07:48:20 -0700 | [diff] [blame] | 88 | mapping_gfp_mask(inode->i_mapping) & |
| 89 | ~(GFP_NOFS & ~__GFP_HIGHMEM)); |
Miao Xie | adae52b | 2011-03-31 09:43:23 +0000 | [diff] [blame] | 90 | |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 91 | return inode; |
| 92 | } |
| 93 | |
| 94 | struct inode *lookup_free_space_inode(struct btrfs_root *root, |
| 95 | struct btrfs_block_group_cache |
| 96 | *block_group, struct btrfs_path *path) |
| 97 | { |
| 98 | struct inode *inode = NULL; |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 99 | u32 flags = BTRFS_INODE_NODATASUM | BTRFS_INODE_NODATACOW; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 100 | |
| 101 | spin_lock(&block_group->lock); |
| 102 | if (block_group->inode) |
| 103 | inode = igrab(block_group->inode); |
| 104 | spin_unlock(&block_group->lock); |
| 105 | if (inode) |
| 106 | return inode; |
| 107 | |
| 108 | inode = __lookup_free_space_inode(root, path, |
| 109 | block_group->key.objectid); |
| 110 | if (IS_ERR(inode)) |
| 111 | return inode; |
| 112 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 113 | spin_lock(&block_group->lock); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 114 | if (!((BTRFS_I(inode)->flags & flags) == flags)) { |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 115 | btrfs_info(root->fs_info, |
| 116 | "Old style space inode found, converting."); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 117 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM | |
| 118 | BTRFS_INODE_NODATACOW; |
Josef Bacik | 2f35612 | 2011-06-10 15:31:13 -0400 | [diff] [blame] | 119 | block_group->disk_cache_state = BTRFS_DC_CLEAR; |
| 120 | } |
| 121 | |
Josef Bacik | 300e4f8 | 2011-08-29 14:06:00 -0400 | [diff] [blame] | 122 | if (!block_group->iref) { |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 123 | block_group->inode = igrab(inode); |
| 124 | block_group->iref = 1; |
| 125 | } |
| 126 | spin_unlock(&block_group->lock); |
| 127 | |
| 128 | return inode; |
| 129 | } |
| 130 | |
Eric Sandeen | 48a3b63 | 2013-04-25 20:41:01 +0000 | [diff] [blame] | 131 | static int __create_free_space_inode(struct btrfs_root *root, |
| 132 | struct btrfs_trans_handle *trans, |
| 133 | struct btrfs_path *path, |
| 134 | u64 ino, u64 offset) |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 135 | { |
| 136 | struct btrfs_key key; |
| 137 | struct btrfs_disk_key disk_key; |
| 138 | struct btrfs_free_space_header *header; |
| 139 | struct btrfs_inode_item *inode_item; |
| 140 | struct extent_buffer *leaf; |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 141 | u64 flags = BTRFS_INODE_NOCOMPRESS | BTRFS_INODE_PREALLOC; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 142 | int ret; |
| 143 | |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 144 | ret = btrfs_insert_empty_inode(trans, root, path, ino); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 145 | if (ret) |
| 146 | return ret; |
| 147 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 148 | /* We inline crc's for the free disk space cache */ |
| 149 | if (ino != BTRFS_FREE_INO_OBJECTID) |
| 150 | flags |= BTRFS_INODE_NODATASUM | BTRFS_INODE_NODATACOW; |
| 151 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 152 | leaf = path->nodes[0]; |
| 153 | inode_item = btrfs_item_ptr(leaf, path->slots[0], |
| 154 | struct btrfs_inode_item); |
| 155 | btrfs_item_key(leaf, &disk_key, path->slots[0]); |
| 156 | memset_extent_buffer(leaf, 0, (unsigned long)inode_item, |
| 157 | sizeof(*inode_item)); |
| 158 | btrfs_set_inode_generation(leaf, inode_item, trans->transid); |
| 159 | btrfs_set_inode_size(leaf, inode_item, 0); |
| 160 | btrfs_set_inode_nbytes(leaf, inode_item, 0); |
| 161 | btrfs_set_inode_uid(leaf, inode_item, 0); |
| 162 | btrfs_set_inode_gid(leaf, inode_item, 0); |
| 163 | btrfs_set_inode_mode(leaf, inode_item, S_IFREG | 0600); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 164 | btrfs_set_inode_flags(leaf, inode_item, flags); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 165 | btrfs_set_inode_nlink(leaf, inode_item, 1); |
| 166 | btrfs_set_inode_transid(leaf, inode_item, trans->transid); |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 167 | btrfs_set_inode_block_group(leaf, inode_item, offset); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 168 | btrfs_mark_buffer_dirty(leaf); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 169 | btrfs_release_path(path); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 170 | |
| 171 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 172 | key.offset = offset; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 173 | key.type = 0; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 174 | ret = btrfs_insert_empty_item(trans, root, path, &key, |
| 175 | sizeof(struct btrfs_free_space_header)); |
| 176 | if (ret < 0) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 177 | btrfs_release_path(path); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 178 | return ret; |
| 179 | } |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 180 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 181 | leaf = path->nodes[0]; |
| 182 | header = btrfs_item_ptr(leaf, path->slots[0], |
| 183 | struct btrfs_free_space_header); |
| 184 | memset_extent_buffer(leaf, 0, (unsigned long)header, sizeof(*header)); |
| 185 | btrfs_set_free_space_key(leaf, header, &disk_key); |
| 186 | btrfs_mark_buffer_dirty(leaf); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 187 | btrfs_release_path(path); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 188 | |
| 189 | return 0; |
| 190 | } |
| 191 | |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 192 | int create_free_space_inode(struct btrfs_root *root, |
| 193 | struct btrfs_trans_handle *trans, |
| 194 | struct btrfs_block_group_cache *block_group, |
| 195 | struct btrfs_path *path) |
| 196 | { |
| 197 | int ret; |
| 198 | u64 ino; |
| 199 | |
| 200 | ret = btrfs_find_free_objectid(root, &ino); |
| 201 | if (ret < 0) |
| 202 | return ret; |
| 203 | |
| 204 | return __create_free_space_inode(root, trans, path, ino, |
| 205 | block_group->key.objectid); |
| 206 | } |
| 207 | |
Miao Xie | 7b61cd9 | 2013-05-13 13:55:09 +0000 | [diff] [blame] | 208 | int btrfs_check_trunc_cache_free_space(struct btrfs_root *root, |
| 209 | struct btrfs_block_rsv *rsv) |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 210 | { |
Josef Bacik | c817431 | 2011-11-02 09:29:35 -0400 | [diff] [blame] | 211 | u64 needed_bytes; |
Miao Xie | 7b61cd9 | 2013-05-13 13:55:09 +0000 | [diff] [blame] | 212 | int ret; |
Josef Bacik | c817431 | 2011-11-02 09:29:35 -0400 | [diff] [blame] | 213 | |
| 214 | /* 1 for slack space, 1 for updating the inode */ |
| 215 | needed_bytes = btrfs_calc_trunc_metadata_size(root, 1) + |
| 216 | btrfs_calc_trans_metadata_size(root, 1); |
| 217 | |
Miao Xie | 7b61cd9 | 2013-05-13 13:55:09 +0000 | [diff] [blame] | 218 | spin_lock(&rsv->lock); |
| 219 | if (rsv->reserved < needed_bytes) |
| 220 | ret = -ENOSPC; |
| 221 | else |
| 222 | ret = 0; |
| 223 | spin_unlock(&rsv->lock); |
Wei Yongjun | 4b286cd | 2013-05-21 02:39:21 +0000 | [diff] [blame] | 224 | return ret; |
Miao Xie | 7b61cd9 | 2013-05-13 13:55:09 +0000 | [diff] [blame] | 225 | } |
| 226 | |
| 227 | int btrfs_truncate_free_space_cache(struct btrfs_root *root, |
| 228 | struct btrfs_trans_handle *trans, |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 229 | struct btrfs_block_group_cache *block_group, |
Miao Xie | 7b61cd9 | 2013-05-13 13:55:09 +0000 | [diff] [blame] | 230 | struct inode *inode) |
| 231 | { |
Miao Xie | 7b61cd9 | 2013-05-13 13:55:09 +0000 | [diff] [blame] | 232 | int ret = 0; |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 233 | struct btrfs_path *path = btrfs_alloc_path(); |
| 234 | |
| 235 | if (!path) { |
| 236 | ret = -ENOMEM; |
| 237 | goto fail; |
| 238 | } |
| 239 | |
| 240 | if (block_group) { |
| 241 | mutex_lock(&trans->transaction->cache_write_mutex); |
| 242 | if (!list_empty(&block_group->io_list)) { |
| 243 | list_del_init(&block_group->io_list); |
| 244 | |
| 245 | btrfs_wait_cache_io(root, trans, block_group, |
| 246 | &block_group->io_ctl, path, |
| 247 | block_group->key.objectid); |
| 248 | btrfs_put_block_group(block_group); |
| 249 | } |
| 250 | |
| 251 | /* |
| 252 | * now that we've truncated the cache away, its no longer |
| 253 | * setup or written |
| 254 | */ |
| 255 | spin_lock(&block_group->lock); |
| 256 | block_group->disk_cache_state = BTRFS_DC_CLEAR; |
| 257 | spin_unlock(&block_group->lock); |
| 258 | } |
| 259 | btrfs_free_path(path); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 260 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 261 | btrfs_i_size_write(inode, 0); |
Kirill A. Shutemov | 7caef26 | 2013-09-12 15:13:56 -0700 | [diff] [blame] | 262 | truncate_pagecache(inode, 0); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 263 | |
| 264 | /* |
| 265 | * We don't need an orphan item because truncating the free space cache |
| 266 | * will never be split across transactions. |
Chris Mason | 28ed134 | 2014-12-17 09:41:04 -0800 | [diff] [blame] | 267 | * We don't need to check for -EAGAIN because we're a free space |
| 268 | * cache inode |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 269 | */ |
| 270 | ret = btrfs_truncate_inode_items(trans, root, inode, |
| 271 | 0, BTRFS_EXTENT_DATA_KEY); |
| 272 | if (ret) { |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 273 | mutex_unlock(&trans->transaction->cache_write_mutex); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 274 | btrfs_abort_transaction(trans, root, ret); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 275 | return ret; |
| 276 | } |
| 277 | |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 278 | ret = btrfs_update_inode(trans, root, inode); |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 279 | |
| 280 | if (block_group) |
| 281 | mutex_unlock(&trans->transaction->cache_write_mutex); |
| 282 | |
| 283 | fail: |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 284 | if (ret) |
| 285 | btrfs_abort_transaction(trans, root, ret); |
Josef Bacik | c817431 | 2011-11-02 09:29:35 -0400 | [diff] [blame] | 286 | |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 287 | return ret; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 288 | } |
| 289 | |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 290 | static int readahead_cache(struct inode *inode) |
| 291 | { |
| 292 | struct file_ra_state *ra; |
| 293 | unsigned long last_index; |
| 294 | |
| 295 | ra = kzalloc(sizeof(*ra), GFP_NOFS); |
| 296 | if (!ra) |
| 297 | return -ENOMEM; |
| 298 | |
| 299 | file_ra_state_init(ra, inode->i_mapping); |
| 300 | last_index = (i_size_read(inode) - 1) >> PAGE_CACHE_SHIFT; |
| 301 | |
| 302 | page_cache_sync_readahead(inode->i_mapping, ra, NULL, 0, last_index); |
| 303 | |
| 304 | kfree(ra); |
| 305 | |
| 306 | return 0; |
| 307 | } |
| 308 | |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 309 | static int io_ctl_init(struct btrfs_io_ctl *io_ctl, struct inode *inode, |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 310 | struct btrfs_root *root, int write) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 311 | { |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 312 | int num_pages; |
| 313 | int check_crcs = 0; |
| 314 | |
David Sterba | ed6078f | 2014-06-05 01:59:57 +0200 | [diff] [blame] | 315 | num_pages = DIV_ROUND_UP(i_size_read(inode), PAGE_CACHE_SIZE); |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 316 | |
| 317 | if (btrfs_ino(inode) != BTRFS_FREE_INO_OBJECTID) |
| 318 | check_crcs = 1; |
| 319 | |
| 320 | /* Make sure we can fit our crcs into the first page */ |
| 321 | if (write && check_crcs && |
| 322 | (num_pages * sizeof(u32)) >= PAGE_CACHE_SIZE) |
| 323 | return -ENOSPC; |
| 324 | |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 325 | memset(io_ctl, 0, sizeof(struct btrfs_io_ctl)); |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 326 | |
David Sterba | 31e818f | 2015-02-20 18:00:26 +0100 | [diff] [blame] | 327 | io_ctl->pages = kcalloc(num_pages, sizeof(struct page *), GFP_NOFS); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 328 | if (!io_ctl->pages) |
| 329 | return -ENOMEM; |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 330 | |
| 331 | io_ctl->num_pages = num_pages; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 332 | io_ctl->root = root; |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 333 | io_ctl->check_crcs = check_crcs; |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 334 | io_ctl->inode = inode; |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 335 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 336 | return 0; |
| 337 | } |
| 338 | |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 339 | static void io_ctl_free(struct btrfs_io_ctl *io_ctl) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 340 | { |
| 341 | kfree(io_ctl->pages); |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 342 | io_ctl->pages = NULL; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 343 | } |
| 344 | |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 345 | static void io_ctl_unmap_page(struct btrfs_io_ctl *io_ctl) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 346 | { |
| 347 | if (io_ctl->cur) { |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 348 | io_ctl->cur = NULL; |
| 349 | io_ctl->orig = NULL; |
| 350 | } |
| 351 | } |
| 352 | |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 353 | static void io_ctl_map_page(struct btrfs_io_ctl *io_ctl, int clear) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 354 | { |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 355 | ASSERT(io_ctl->index < io_ctl->num_pages); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 356 | io_ctl->page = io_ctl->pages[io_ctl->index++]; |
Chris Mason | 2b10826 | 2015-04-06 07:48:20 -0700 | [diff] [blame] | 357 | io_ctl->cur = page_address(io_ctl->page); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 358 | io_ctl->orig = io_ctl->cur; |
| 359 | io_ctl->size = PAGE_CACHE_SIZE; |
| 360 | if (clear) |
| 361 | memset(io_ctl->cur, 0, PAGE_CACHE_SIZE); |
| 362 | } |
| 363 | |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 364 | static void io_ctl_drop_pages(struct btrfs_io_ctl *io_ctl) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 365 | { |
| 366 | int i; |
| 367 | |
| 368 | io_ctl_unmap_page(io_ctl); |
| 369 | |
| 370 | for (i = 0; i < io_ctl->num_pages; i++) { |
Li Zefan | a1ee5a4 | 2012-01-09 14:27:42 +0800 | [diff] [blame] | 371 | if (io_ctl->pages[i]) { |
| 372 | ClearPageChecked(io_ctl->pages[i]); |
| 373 | unlock_page(io_ctl->pages[i]); |
| 374 | page_cache_release(io_ctl->pages[i]); |
| 375 | } |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 376 | } |
| 377 | } |
| 378 | |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 379 | static int io_ctl_prepare_pages(struct btrfs_io_ctl *io_ctl, struct inode *inode, |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 380 | int uptodate) |
| 381 | { |
| 382 | struct page *page; |
| 383 | gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); |
| 384 | int i; |
| 385 | |
| 386 | for (i = 0; i < io_ctl->num_pages; i++) { |
| 387 | page = find_or_create_page(inode->i_mapping, i, mask); |
| 388 | if (!page) { |
| 389 | io_ctl_drop_pages(io_ctl); |
| 390 | return -ENOMEM; |
| 391 | } |
| 392 | io_ctl->pages[i] = page; |
| 393 | if (uptodate && !PageUptodate(page)) { |
| 394 | btrfs_readpage(NULL, page); |
| 395 | lock_page(page); |
| 396 | if (!PageUptodate(page)) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 397 | btrfs_err(BTRFS_I(inode)->root->fs_info, |
| 398 | "error reading free space cache"); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 399 | io_ctl_drop_pages(io_ctl); |
| 400 | return -EIO; |
| 401 | } |
| 402 | } |
| 403 | } |
| 404 | |
Josef Bacik | f7d61dc | 2011-11-15 09:31:24 -0500 | [diff] [blame] | 405 | for (i = 0; i < io_ctl->num_pages; i++) { |
| 406 | clear_page_dirty_for_io(io_ctl->pages[i]); |
| 407 | set_page_extent_mapped(io_ctl->pages[i]); |
| 408 | } |
| 409 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 410 | return 0; |
| 411 | } |
| 412 | |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 413 | static void io_ctl_set_generation(struct btrfs_io_ctl *io_ctl, u64 generation) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 414 | { |
Al Viro | 528c032 | 2012-04-13 11:03:55 -0400 | [diff] [blame] | 415 | __le64 *val; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 416 | |
| 417 | io_ctl_map_page(io_ctl, 1); |
| 418 | |
| 419 | /* |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 420 | * Skip the csum areas. If we don't check crcs then we just have a |
| 421 | * 64bit chunk at the front of the first page. |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 422 | */ |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 423 | if (io_ctl->check_crcs) { |
| 424 | io_ctl->cur += (sizeof(u32) * io_ctl->num_pages); |
| 425 | io_ctl->size -= sizeof(u64) + (sizeof(u32) * io_ctl->num_pages); |
| 426 | } else { |
| 427 | io_ctl->cur += sizeof(u64); |
| 428 | io_ctl->size -= sizeof(u64) * 2; |
| 429 | } |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 430 | |
| 431 | val = io_ctl->cur; |
| 432 | *val = cpu_to_le64(generation); |
| 433 | io_ctl->cur += sizeof(u64); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 434 | } |
| 435 | |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 436 | static int io_ctl_check_generation(struct btrfs_io_ctl *io_ctl, u64 generation) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 437 | { |
Al Viro | 528c032 | 2012-04-13 11:03:55 -0400 | [diff] [blame] | 438 | __le64 *gen; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 439 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 440 | /* |
| 441 | * Skip the crc area. If we don't check crcs then we just have a 64bit |
| 442 | * chunk at the front of the first page. |
| 443 | */ |
| 444 | if (io_ctl->check_crcs) { |
| 445 | io_ctl->cur += sizeof(u32) * io_ctl->num_pages; |
| 446 | io_ctl->size -= sizeof(u64) + |
| 447 | (sizeof(u32) * io_ctl->num_pages); |
| 448 | } else { |
| 449 | io_ctl->cur += sizeof(u64); |
| 450 | io_ctl->size -= sizeof(u64) * 2; |
| 451 | } |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 452 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 453 | gen = io_ctl->cur; |
| 454 | if (le64_to_cpu(*gen) != generation) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 455 | printk_ratelimited(KERN_ERR "BTRFS: space cache generation " |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 456 | "(%Lu) does not match inode (%Lu)\n", *gen, |
| 457 | generation); |
| 458 | io_ctl_unmap_page(io_ctl); |
| 459 | return -EIO; |
| 460 | } |
| 461 | io_ctl->cur += sizeof(u64); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 462 | return 0; |
| 463 | } |
| 464 | |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 465 | static void io_ctl_set_crc(struct btrfs_io_ctl *io_ctl, int index) |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 466 | { |
| 467 | u32 *tmp; |
| 468 | u32 crc = ~(u32)0; |
| 469 | unsigned offset = 0; |
| 470 | |
| 471 | if (!io_ctl->check_crcs) { |
| 472 | io_ctl_unmap_page(io_ctl); |
| 473 | return; |
| 474 | } |
| 475 | |
| 476 | if (index == 0) |
Justin P. Mattock | cb54f25 | 2011-11-21 08:43:28 -0800 | [diff] [blame] | 477 | offset = sizeof(u32) * io_ctl->num_pages; |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 478 | |
Liu Bo | b049668 | 2013-03-14 14:57:45 +0000 | [diff] [blame] | 479 | crc = btrfs_csum_data(io_ctl->orig + offset, crc, |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 480 | PAGE_CACHE_SIZE - offset); |
| 481 | btrfs_csum_final(crc, (char *)&crc); |
| 482 | io_ctl_unmap_page(io_ctl); |
Chris Mason | 2b10826 | 2015-04-06 07:48:20 -0700 | [diff] [blame] | 483 | tmp = page_address(io_ctl->pages[0]); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 484 | tmp += index; |
| 485 | *tmp = crc; |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 486 | } |
| 487 | |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 488 | static int io_ctl_check_crc(struct btrfs_io_ctl *io_ctl, int index) |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 489 | { |
| 490 | u32 *tmp, val; |
| 491 | u32 crc = ~(u32)0; |
| 492 | unsigned offset = 0; |
| 493 | |
| 494 | if (!io_ctl->check_crcs) { |
| 495 | io_ctl_map_page(io_ctl, 0); |
| 496 | return 0; |
| 497 | } |
| 498 | |
| 499 | if (index == 0) |
| 500 | offset = sizeof(u32) * io_ctl->num_pages; |
| 501 | |
Chris Mason | 2b10826 | 2015-04-06 07:48:20 -0700 | [diff] [blame] | 502 | tmp = page_address(io_ctl->pages[0]); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 503 | tmp += index; |
| 504 | val = *tmp; |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 505 | |
| 506 | io_ctl_map_page(io_ctl, 0); |
Liu Bo | b049668 | 2013-03-14 14:57:45 +0000 | [diff] [blame] | 507 | crc = btrfs_csum_data(io_ctl->orig + offset, crc, |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 508 | PAGE_CACHE_SIZE - offset); |
| 509 | btrfs_csum_final(crc, (char *)&crc); |
| 510 | if (val != crc) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 511 | printk_ratelimited(KERN_ERR "BTRFS: csum mismatch on free " |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 512 | "space cache\n"); |
| 513 | io_ctl_unmap_page(io_ctl); |
| 514 | return -EIO; |
| 515 | } |
| 516 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 517 | return 0; |
| 518 | } |
| 519 | |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 520 | static int io_ctl_add_entry(struct btrfs_io_ctl *io_ctl, u64 offset, u64 bytes, |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 521 | void *bitmap) |
| 522 | { |
| 523 | struct btrfs_free_space_entry *entry; |
| 524 | |
| 525 | if (!io_ctl->cur) |
| 526 | return -ENOSPC; |
| 527 | |
| 528 | entry = io_ctl->cur; |
| 529 | entry->offset = cpu_to_le64(offset); |
| 530 | entry->bytes = cpu_to_le64(bytes); |
| 531 | entry->type = (bitmap) ? BTRFS_FREE_SPACE_BITMAP : |
| 532 | BTRFS_FREE_SPACE_EXTENT; |
| 533 | io_ctl->cur += sizeof(struct btrfs_free_space_entry); |
| 534 | io_ctl->size -= sizeof(struct btrfs_free_space_entry); |
| 535 | |
| 536 | if (io_ctl->size >= sizeof(struct btrfs_free_space_entry)) |
| 537 | return 0; |
| 538 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 539 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 540 | |
| 541 | /* No more pages to map */ |
| 542 | if (io_ctl->index >= io_ctl->num_pages) |
| 543 | return 0; |
| 544 | |
| 545 | /* map the next page */ |
| 546 | io_ctl_map_page(io_ctl, 1); |
| 547 | return 0; |
| 548 | } |
| 549 | |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 550 | static int io_ctl_add_bitmap(struct btrfs_io_ctl *io_ctl, void *bitmap) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 551 | { |
| 552 | if (!io_ctl->cur) |
| 553 | return -ENOSPC; |
| 554 | |
| 555 | /* |
| 556 | * If we aren't at the start of the current page, unmap this one and |
| 557 | * map the next one if there is any left. |
| 558 | */ |
| 559 | if (io_ctl->cur != io_ctl->orig) { |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 560 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 561 | if (io_ctl->index >= io_ctl->num_pages) |
| 562 | return -ENOSPC; |
| 563 | io_ctl_map_page(io_ctl, 0); |
| 564 | } |
| 565 | |
| 566 | memcpy(io_ctl->cur, bitmap, PAGE_CACHE_SIZE); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 567 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 568 | if (io_ctl->index < io_ctl->num_pages) |
| 569 | io_ctl_map_page(io_ctl, 0); |
| 570 | return 0; |
| 571 | } |
| 572 | |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 573 | static void io_ctl_zero_remaining_pages(struct btrfs_io_ctl *io_ctl) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 574 | { |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 575 | /* |
| 576 | * If we're not on the boundary we know we've modified the page and we |
| 577 | * need to crc the page. |
| 578 | */ |
| 579 | if (io_ctl->cur != io_ctl->orig) |
| 580 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); |
| 581 | else |
| 582 | io_ctl_unmap_page(io_ctl); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 583 | |
| 584 | while (io_ctl->index < io_ctl->num_pages) { |
| 585 | io_ctl_map_page(io_ctl, 1); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 586 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 587 | } |
| 588 | } |
| 589 | |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 590 | static int io_ctl_read_entry(struct btrfs_io_ctl *io_ctl, |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 591 | struct btrfs_free_space *entry, u8 *type) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 592 | { |
| 593 | struct btrfs_free_space_entry *e; |
Josef Bacik | 2f120c0 | 2011-11-10 20:45:05 -0500 | [diff] [blame] | 594 | int ret; |
| 595 | |
| 596 | if (!io_ctl->cur) { |
| 597 | ret = io_ctl_check_crc(io_ctl, io_ctl->index); |
| 598 | if (ret) |
| 599 | return ret; |
| 600 | } |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 601 | |
| 602 | e = io_ctl->cur; |
| 603 | entry->offset = le64_to_cpu(e->offset); |
| 604 | entry->bytes = le64_to_cpu(e->bytes); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 605 | *type = e->type; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 606 | io_ctl->cur += sizeof(struct btrfs_free_space_entry); |
| 607 | io_ctl->size -= sizeof(struct btrfs_free_space_entry); |
| 608 | |
| 609 | if (io_ctl->size >= sizeof(struct btrfs_free_space_entry)) |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 610 | return 0; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 611 | |
| 612 | io_ctl_unmap_page(io_ctl); |
| 613 | |
Josef Bacik | 2f120c0 | 2011-11-10 20:45:05 -0500 | [diff] [blame] | 614 | return 0; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 615 | } |
| 616 | |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 617 | static int io_ctl_read_bitmap(struct btrfs_io_ctl *io_ctl, |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 618 | struct btrfs_free_space *entry) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 619 | { |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 620 | int ret; |
| 621 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 622 | ret = io_ctl_check_crc(io_ctl, io_ctl->index); |
| 623 | if (ret) |
| 624 | return ret; |
| 625 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 626 | memcpy(entry->bitmap, io_ctl->cur, PAGE_CACHE_SIZE); |
| 627 | io_ctl_unmap_page(io_ctl); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 628 | |
| 629 | return 0; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 630 | } |
| 631 | |
Josef Bacik | cd023e7 | 2012-05-14 10:06:40 -0400 | [diff] [blame] | 632 | /* |
| 633 | * Since we attach pinned extents after the fact we can have contiguous sections |
| 634 | * of free space that are split up in entries. This poses a problem with the |
| 635 | * tree logging stuff since it could have allocated across what appears to be 2 |
| 636 | * entries since we would have merged the entries when adding the pinned extents |
| 637 | * back to the free space cache. So run through the space cache that we just |
| 638 | * loaded and merge contiguous entries. This will make the log replay stuff not |
| 639 | * blow up and it will make for nicer allocator behavior. |
| 640 | */ |
| 641 | static void merge_space_tree(struct btrfs_free_space_ctl *ctl) |
| 642 | { |
| 643 | struct btrfs_free_space *e, *prev = NULL; |
| 644 | struct rb_node *n; |
| 645 | |
| 646 | again: |
| 647 | spin_lock(&ctl->tree_lock); |
| 648 | for (n = rb_first(&ctl->free_space_offset); n; n = rb_next(n)) { |
| 649 | e = rb_entry(n, struct btrfs_free_space, offset_index); |
| 650 | if (!prev) |
| 651 | goto next; |
| 652 | if (e->bitmap || prev->bitmap) |
| 653 | goto next; |
| 654 | if (prev->offset + prev->bytes == e->offset) { |
| 655 | unlink_free_space(ctl, prev); |
| 656 | unlink_free_space(ctl, e); |
| 657 | prev->bytes += e->bytes; |
| 658 | kmem_cache_free(btrfs_free_space_cachep, e); |
| 659 | link_free_space(ctl, prev); |
| 660 | prev = NULL; |
| 661 | spin_unlock(&ctl->tree_lock); |
| 662 | goto again; |
| 663 | } |
| 664 | next: |
| 665 | prev = e; |
| 666 | } |
| 667 | spin_unlock(&ctl->tree_lock); |
| 668 | } |
| 669 | |
Eric Sandeen | 48a3b63 | 2013-04-25 20:41:01 +0000 | [diff] [blame] | 670 | static int __load_free_space_cache(struct btrfs_root *root, struct inode *inode, |
| 671 | struct btrfs_free_space_ctl *ctl, |
| 672 | struct btrfs_path *path, u64 offset) |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 673 | { |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 674 | struct btrfs_free_space_header *header; |
| 675 | struct extent_buffer *leaf; |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 676 | struct btrfs_io_ctl io_ctl; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 677 | struct btrfs_key key; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 678 | struct btrfs_free_space *e, *n; |
Gui Hecheng | b76808f | 2014-12-31 09:51:35 +0800 | [diff] [blame] | 679 | LIST_HEAD(bitmaps); |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 680 | u64 num_entries; |
| 681 | u64 num_bitmaps; |
| 682 | u64 generation; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 683 | u8 type; |
Josef Bacik | f6a3982 | 2011-06-06 10:50:35 -0400 | [diff] [blame] | 684 | int ret = 0; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 685 | |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 686 | /* Nothing in the space cache, goodbye */ |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 687 | if (!i_size_read(inode)) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 688 | return 0; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 689 | |
| 690 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 691 | key.offset = offset; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 692 | key.type = 0; |
| 693 | |
| 694 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 695 | if (ret < 0) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 696 | return 0; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 697 | else if (ret > 0) { |
Chris Mason | 945d896 | 2011-05-22 12:33:42 -0400 | [diff] [blame] | 698 | btrfs_release_path(path); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 699 | return 0; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 700 | } |
| 701 | |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 702 | ret = -1; |
| 703 | |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 704 | leaf = path->nodes[0]; |
| 705 | header = btrfs_item_ptr(leaf, path->slots[0], |
| 706 | struct btrfs_free_space_header); |
| 707 | num_entries = btrfs_free_space_entries(leaf, header); |
| 708 | num_bitmaps = btrfs_free_space_bitmaps(leaf, header); |
| 709 | generation = btrfs_free_space_generation(leaf, header); |
Chris Mason | 945d896 | 2011-05-22 12:33:42 -0400 | [diff] [blame] | 710 | btrfs_release_path(path); |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 711 | |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 712 | if (!BTRFS_I(inode)->generation) { |
| 713 | btrfs_info(root->fs_info, |
| 714 | "The free space cache file (%llu) is invalid. skip it\n", |
| 715 | offset); |
| 716 | return 0; |
| 717 | } |
| 718 | |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 719 | if (BTRFS_I(inode)->generation != generation) { |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 720 | btrfs_err(root->fs_info, |
| 721 | "free space inode generation (%llu) " |
| 722 | "did not match free space cache generation (%llu)", |
Geert Uytterhoeven | c1c9ff7 | 2013-08-20 13:20:07 +0200 | [diff] [blame] | 723 | BTRFS_I(inode)->generation, generation); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 724 | return 0; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 725 | } |
| 726 | |
| 727 | if (!num_entries) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 728 | return 0; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 729 | |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 730 | ret = io_ctl_init(&io_ctl, inode, root, 0); |
Li Zefan | 706efc6 | 2012-01-09 14:36:28 +0800 | [diff] [blame] | 731 | if (ret) |
| 732 | return ret; |
| 733 | |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 734 | ret = readahead_cache(inode); |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 735 | if (ret) |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 736 | goto out; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 737 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 738 | ret = io_ctl_prepare_pages(&io_ctl, inode, 1); |
| 739 | if (ret) |
| 740 | goto out; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 741 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 742 | ret = io_ctl_check_crc(&io_ctl, 0); |
| 743 | if (ret) |
| 744 | goto free_cache; |
| 745 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 746 | ret = io_ctl_check_generation(&io_ctl, generation); |
| 747 | if (ret) |
| 748 | goto free_cache; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 749 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 750 | while (num_entries) { |
| 751 | e = kmem_cache_zalloc(btrfs_free_space_cachep, |
| 752 | GFP_NOFS); |
| 753 | if (!e) |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 754 | goto free_cache; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 755 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 756 | ret = io_ctl_read_entry(&io_ctl, e, &type); |
| 757 | if (ret) { |
| 758 | kmem_cache_free(btrfs_free_space_cachep, e); |
| 759 | goto free_cache; |
| 760 | } |
| 761 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 762 | if (!e->bytes) { |
| 763 | kmem_cache_free(btrfs_free_space_cachep, e); |
| 764 | goto free_cache; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 765 | } |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 766 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 767 | if (type == BTRFS_FREE_SPACE_EXTENT) { |
| 768 | spin_lock(&ctl->tree_lock); |
| 769 | ret = link_free_space(ctl, e); |
| 770 | spin_unlock(&ctl->tree_lock); |
| 771 | if (ret) { |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 772 | btrfs_err(root->fs_info, |
| 773 | "Duplicate entries in free space cache, dumping"); |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 774 | kmem_cache_free(btrfs_free_space_cachep, e); |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 775 | goto free_cache; |
| 776 | } |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 777 | } else { |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 778 | ASSERT(num_bitmaps); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 779 | num_bitmaps--; |
| 780 | e->bitmap = kzalloc(PAGE_CACHE_SIZE, GFP_NOFS); |
| 781 | if (!e->bitmap) { |
| 782 | kmem_cache_free( |
| 783 | btrfs_free_space_cachep, e); |
| 784 | goto free_cache; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 785 | } |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 786 | spin_lock(&ctl->tree_lock); |
| 787 | ret = link_free_space(ctl, e); |
| 788 | ctl->total_bitmaps++; |
| 789 | ctl->op->recalc_thresholds(ctl); |
| 790 | spin_unlock(&ctl->tree_lock); |
| 791 | if (ret) { |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 792 | btrfs_err(root->fs_info, |
| 793 | "Duplicate entries in free space cache, dumping"); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 794 | kmem_cache_free(btrfs_free_space_cachep, e); |
| 795 | goto free_cache; |
| 796 | } |
| 797 | list_add_tail(&e->list, &bitmaps); |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 798 | } |
| 799 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 800 | num_entries--; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 801 | } |
| 802 | |
Josef Bacik | 2f120c0 | 2011-11-10 20:45:05 -0500 | [diff] [blame] | 803 | io_ctl_unmap_page(&io_ctl); |
| 804 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 805 | /* |
| 806 | * We add the bitmaps at the end of the entries in order that |
| 807 | * the bitmap entries are added to the cache. |
| 808 | */ |
| 809 | list_for_each_entry_safe(e, n, &bitmaps, list) { |
| 810 | list_del_init(&e->list); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 811 | ret = io_ctl_read_bitmap(&io_ctl, e); |
| 812 | if (ret) |
| 813 | goto free_cache; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 814 | } |
| 815 | |
| 816 | io_ctl_drop_pages(&io_ctl); |
Josef Bacik | cd023e7 | 2012-05-14 10:06:40 -0400 | [diff] [blame] | 817 | merge_space_tree(ctl); |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 818 | ret = 1; |
| 819 | out: |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 820 | io_ctl_free(&io_ctl); |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 821 | return ret; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 822 | free_cache: |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 823 | io_ctl_drop_pages(&io_ctl); |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 824 | __btrfs_remove_free_space_cache(ctl); |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 825 | goto out; |
| 826 | } |
| 827 | |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 828 | int load_free_space_cache(struct btrfs_fs_info *fs_info, |
| 829 | struct btrfs_block_group_cache *block_group) |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 830 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 831 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 832 | struct btrfs_root *root = fs_info->tree_root; |
| 833 | struct inode *inode; |
| 834 | struct btrfs_path *path; |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 835 | int ret = 0; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 836 | bool matched; |
| 837 | u64 used = btrfs_block_group_used(&block_group->item); |
| 838 | |
| 839 | /* |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 840 | * If this block group has been marked to be cleared for one reason or |
| 841 | * another then we can't trust the on disk cache, so just return. |
| 842 | */ |
| 843 | spin_lock(&block_group->lock); |
| 844 | if (block_group->disk_cache_state != BTRFS_DC_WRITTEN) { |
| 845 | spin_unlock(&block_group->lock); |
| 846 | return 0; |
| 847 | } |
| 848 | spin_unlock(&block_group->lock); |
| 849 | |
| 850 | path = btrfs_alloc_path(); |
| 851 | if (!path) |
| 852 | return 0; |
Josef Bacik | d53ba47 | 2012-04-12 16:03:57 -0400 | [diff] [blame] | 853 | path->search_commit_root = 1; |
| 854 | path->skip_locking = 1; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 855 | |
| 856 | inode = lookup_free_space_inode(root, block_group, path); |
| 857 | if (IS_ERR(inode)) { |
| 858 | btrfs_free_path(path); |
| 859 | return 0; |
| 860 | } |
| 861 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 862 | /* We may have converted the inode and made the cache invalid. */ |
| 863 | spin_lock(&block_group->lock); |
| 864 | if (block_group->disk_cache_state != BTRFS_DC_WRITTEN) { |
| 865 | spin_unlock(&block_group->lock); |
Tsutomu Itoh | a7e221e | 2012-02-14 17:12:23 +0900 | [diff] [blame] | 866 | btrfs_free_path(path); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 867 | goto out; |
| 868 | } |
| 869 | spin_unlock(&block_group->lock); |
| 870 | |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 871 | ret = __load_free_space_cache(fs_info->tree_root, inode, ctl, |
| 872 | path, block_group->key.objectid); |
| 873 | btrfs_free_path(path); |
| 874 | if (ret <= 0) |
| 875 | goto out; |
| 876 | |
| 877 | spin_lock(&ctl->tree_lock); |
| 878 | matched = (ctl->free_space == (block_group->key.offset - used - |
| 879 | block_group->bytes_super)); |
| 880 | spin_unlock(&ctl->tree_lock); |
| 881 | |
| 882 | if (!matched) { |
| 883 | __btrfs_remove_free_space_cache(ctl); |
Miao Xie | 32d6b47 | 2014-04-24 13:31:55 +0800 | [diff] [blame] | 884 | btrfs_warn(fs_info, "block group %llu has wrong amount of free space", |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 885 | block_group->key.objectid); |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 886 | ret = -1; |
| 887 | } |
| 888 | out: |
| 889 | if (ret < 0) { |
| 890 | /* This cache is bogus, make sure it gets cleared */ |
| 891 | spin_lock(&block_group->lock); |
| 892 | block_group->disk_cache_state = BTRFS_DC_CLEAR; |
| 893 | spin_unlock(&block_group->lock); |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 894 | ret = 0; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 895 | |
Miao Xie | 32d6b47 | 2014-04-24 13:31:55 +0800 | [diff] [blame] | 896 | btrfs_warn(fs_info, "failed to load free space cache for block group %llu, rebuild it now", |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 897 | block_group->key.objectid); |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 898 | } |
| 899 | |
| 900 | iput(inode); |
| 901 | return ret; |
| 902 | } |
| 903 | |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 904 | static noinline_for_stack |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 905 | int write_cache_extent_entries(struct btrfs_io_ctl *io_ctl, |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 906 | struct btrfs_free_space_ctl *ctl, |
| 907 | struct btrfs_block_group_cache *block_group, |
| 908 | int *entries, int *bitmaps, |
| 909 | struct list_head *bitmap_list) |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 910 | { |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 911 | int ret; |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 912 | struct btrfs_free_cluster *cluster = NULL; |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 913 | struct btrfs_free_cluster *cluster_locked = NULL; |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 914 | struct rb_node *node = rb_first(&ctl->free_space_offset); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 915 | struct btrfs_trim_range *trim_entry; |
Josef Bacik | be1a12a | 2011-04-06 13:05:22 -0400 | [diff] [blame] | 916 | |
Josef Bacik | 43be214 | 2011-04-01 14:55:00 +0000 | [diff] [blame] | 917 | /* Get the cluster for this block_group if it exists */ |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 918 | if (block_group && !list_empty(&block_group->cluster_list)) { |
Josef Bacik | 43be214 | 2011-04-01 14:55:00 +0000 | [diff] [blame] | 919 | cluster = list_entry(block_group->cluster_list.next, |
| 920 | struct btrfs_free_cluster, |
| 921 | block_group_list); |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 922 | } |
Josef Bacik | 43be214 | 2011-04-01 14:55:00 +0000 | [diff] [blame] | 923 | |
Josef Bacik | f75b130 | 2011-10-05 10:00:18 -0400 | [diff] [blame] | 924 | if (!node && cluster) { |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 925 | cluster_locked = cluster; |
| 926 | spin_lock(&cluster_locked->lock); |
Josef Bacik | f75b130 | 2011-10-05 10:00:18 -0400 | [diff] [blame] | 927 | node = rb_first(&cluster->root); |
| 928 | cluster = NULL; |
| 929 | } |
| 930 | |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 931 | /* Write out the extent entries */ |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 932 | while (node) { |
| 933 | struct btrfs_free_space *e; |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 934 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 935 | e = rb_entry(node, struct btrfs_free_space, offset_index); |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 936 | *entries += 1; |
Josef Bacik | 43be214 | 2011-04-01 14:55:00 +0000 | [diff] [blame] | 937 | |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 938 | ret = io_ctl_add_entry(io_ctl, e->offset, e->bytes, |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 939 | e->bitmap); |
| 940 | if (ret) |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 941 | goto fail; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 942 | |
| 943 | if (e->bitmap) { |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 944 | list_add_tail(&e->list, bitmap_list); |
| 945 | *bitmaps += 1; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 946 | } |
| 947 | node = rb_next(node); |
| 948 | if (!node && cluster) { |
| 949 | node = rb_first(&cluster->root); |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 950 | cluster_locked = cluster; |
| 951 | spin_lock(&cluster_locked->lock); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 952 | cluster = NULL; |
| 953 | } |
| 954 | } |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 955 | if (cluster_locked) { |
| 956 | spin_unlock(&cluster_locked->lock); |
| 957 | cluster_locked = NULL; |
| 958 | } |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 959 | |
| 960 | /* |
| 961 | * Make sure we don't miss any range that was removed from our rbtree |
| 962 | * because trimming is running. Otherwise after a umount+mount (or crash |
| 963 | * after committing the transaction) we would leak free space and get |
| 964 | * an inconsistent free space cache report from fsck. |
| 965 | */ |
| 966 | list_for_each_entry(trim_entry, &ctl->trimming_ranges, list) { |
| 967 | ret = io_ctl_add_entry(io_ctl, trim_entry->start, |
| 968 | trim_entry->bytes, NULL); |
| 969 | if (ret) |
| 970 | goto fail; |
| 971 | *entries += 1; |
| 972 | } |
| 973 | |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 974 | return 0; |
| 975 | fail: |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 976 | if (cluster_locked) |
| 977 | spin_unlock(&cluster_locked->lock); |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 978 | return -ENOSPC; |
| 979 | } |
| 980 | |
| 981 | static noinline_for_stack int |
| 982 | update_cache_item(struct btrfs_trans_handle *trans, |
| 983 | struct btrfs_root *root, |
| 984 | struct inode *inode, |
| 985 | struct btrfs_path *path, u64 offset, |
| 986 | int entries, int bitmaps) |
| 987 | { |
| 988 | struct btrfs_key key; |
| 989 | struct btrfs_free_space_header *header; |
| 990 | struct extent_buffer *leaf; |
| 991 | int ret; |
| 992 | |
| 993 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; |
| 994 | key.offset = offset; |
| 995 | key.type = 0; |
| 996 | |
| 997 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); |
| 998 | if (ret < 0) { |
| 999 | clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, inode->i_size - 1, |
| 1000 | EXTENT_DIRTY | EXTENT_DELALLOC, 0, 0, NULL, |
| 1001 | GFP_NOFS); |
| 1002 | goto fail; |
| 1003 | } |
| 1004 | leaf = path->nodes[0]; |
| 1005 | if (ret > 0) { |
| 1006 | struct btrfs_key found_key; |
| 1007 | ASSERT(path->slots[0]); |
| 1008 | path->slots[0]--; |
| 1009 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
| 1010 | if (found_key.objectid != BTRFS_FREE_SPACE_OBJECTID || |
| 1011 | found_key.offset != offset) { |
| 1012 | clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, |
| 1013 | inode->i_size - 1, |
| 1014 | EXTENT_DIRTY | EXTENT_DELALLOC, 0, 0, |
| 1015 | NULL, GFP_NOFS); |
| 1016 | btrfs_release_path(path); |
| 1017 | goto fail; |
| 1018 | } |
| 1019 | } |
| 1020 | |
| 1021 | BTRFS_I(inode)->generation = trans->transid; |
| 1022 | header = btrfs_item_ptr(leaf, path->slots[0], |
| 1023 | struct btrfs_free_space_header); |
| 1024 | btrfs_set_free_space_entries(leaf, header, entries); |
| 1025 | btrfs_set_free_space_bitmaps(leaf, header, bitmaps); |
| 1026 | btrfs_set_free_space_generation(leaf, header, trans->transid); |
| 1027 | btrfs_mark_buffer_dirty(leaf); |
| 1028 | btrfs_release_path(path); |
| 1029 | |
| 1030 | return 0; |
| 1031 | |
| 1032 | fail: |
| 1033 | return -1; |
| 1034 | } |
| 1035 | |
| 1036 | static noinline_for_stack int |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1037 | write_pinned_extent_entries(struct btrfs_root *root, |
| 1038 | struct btrfs_block_group_cache *block_group, |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 1039 | struct btrfs_io_ctl *io_ctl, |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1040 | int *entries) |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1041 | { |
| 1042 | u64 start, extent_start, extent_end, len; |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1043 | struct extent_io_tree *unpin = NULL; |
| 1044 | int ret; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 1045 | |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1046 | if (!block_group) |
| 1047 | return 0; |
| 1048 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 1049 | /* |
| 1050 | * We want to add any pinned extents to our free space cache |
| 1051 | * so we don't leak the space |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1052 | * |
Li Zefan | db804f2 | 2012-01-10 16:41:01 +0800 | [diff] [blame] | 1053 | * We shouldn't have switched the pinned extents yet so this is the |
| 1054 | * right one |
| 1055 | */ |
| 1056 | unpin = root->fs_info->pinned_extents; |
| 1057 | |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1058 | start = block_group->key.objectid; |
Li Zefan | db804f2 | 2012-01-10 16:41:01 +0800 | [diff] [blame] | 1059 | |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1060 | while (start < block_group->key.objectid + block_group->key.offset) { |
Li Zefan | db804f2 | 2012-01-10 16:41:01 +0800 | [diff] [blame] | 1061 | ret = find_first_extent_bit(unpin, start, |
| 1062 | &extent_start, &extent_end, |
Josef Bacik | e613887 | 2012-09-27 17:07:30 -0400 | [diff] [blame] | 1063 | EXTENT_DIRTY, NULL); |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1064 | if (ret) |
| 1065 | return 0; |
Josef Bacik | be1a12a | 2011-04-06 13:05:22 -0400 | [diff] [blame] | 1066 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 1067 | /* This pinned extent is out of our range */ |
Li Zefan | db804f2 | 2012-01-10 16:41:01 +0800 | [diff] [blame] | 1068 | if (extent_start >= block_group->key.objectid + |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 1069 | block_group->key.offset) |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1070 | return 0; |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1071 | |
Li Zefan | db804f2 | 2012-01-10 16:41:01 +0800 | [diff] [blame] | 1072 | extent_start = max(extent_start, start); |
| 1073 | extent_end = min(block_group->key.objectid + |
| 1074 | block_group->key.offset, extent_end + 1); |
| 1075 | len = extent_end - extent_start; |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1076 | |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1077 | *entries += 1; |
| 1078 | ret = io_ctl_add_entry(io_ctl, extent_start, len, NULL); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 1079 | if (ret) |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1080 | return -ENOSPC; |
Josef Bacik | 2f35612 | 2011-06-10 15:31:13 -0400 | [diff] [blame] | 1081 | |
Li Zefan | db804f2 | 2012-01-10 16:41:01 +0800 | [diff] [blame] | 1082 | start = extent_end; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 1083 | } |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1084 | |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1085 | return 0; |
| 1086 | } |
| 1087 | |
| 1088 | static noinline_for_stack int |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 1089 | write_bitmap_entries(struct btrfs_io_ctl *io_ctl, struct list_head *bitmap_list) |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1090 | { |
| 1091 | struct list_head *pos, *n; |
| 1092 | int ret; |
| 1093 | |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1094 | /* Write out the bitmaps */ |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1095 | list_for_each_safe(pos, n, bitmap_list) { |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1096 | struct btrfs_free_space *entry = |
| 1097 | list_entry(pos, struct btrfs_free_space, list); |
| 1098 | |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1099 | ret = io_ctl_add_bitmap(io_ctl, entry->bitmap); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 1100 | if (ret) |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1101 | return -ENOSPC; |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1102 | list_del_init(&entry->list); |
Josef Bacik | be1a12a | 2011-04-06 13:05:22 -0400 | [diff] [blame] | 1103 | } |
| 1104 | |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1105 | return 0; |
| 1106 | } |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1107 | |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1108 | static int flush_dirty_cache(struct inode *inode) |
| 1109 | { |
| 1110 | int ret; |
Josef Bacik | be1a12a | 2011-04-06 13:05:22 -0400 | [diff] [blame] | 1111 | |
Josef Bacik | 0ef8b72 | 2013-10-25 16:13:35 -0400 | [diff] [blame] | 1112 | ret = btrfs_wait_ordered_range(inode, 0, (u64)-1); |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1113 | if (ret) |
Josef Bacik | 0ef8b72 | 2013-10-25 16:13:35 -0400 | [diff] [blame] | 1114 | clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, inode->i_size - 1, |
| 1115 | EXTENT_DIRTY | EXTENT_DELALLOC, 0, 0, NULL, |
| 1116 | GFP_NOFS); |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1117 | |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1118 | return ret; |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1119 | } |
| 1120 | |
| 1121 | static void noinline_for_stack |
| 1122 | cleanup_write_cache_enospc(struct inode *inode, |
Chris Mason | 4c6d1d8 | 2015-04-06 13:17:20 -0700 | [diff] [blame] | 1123 | struct btrfs_io_ctl *io_ctl, |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1124 | struct extent_state **cached_state, |
| 1125 | struct list_head *bitmap_list) |
| 1126 | { |
| 1127 | struct list_head *pos, *n; |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1128 | |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1129 | list_for_each_safe(pos, n, bitmap_list) { |
| 1130 | struct btrfs_free_space *entry = |
| 1131 | list_entry(pos, struct btrfs_free_space, list); |
| 1132 | list_del_init(&entry->list); |
| 1133 | } |
| 1134 | io_ctl_drop_pages(io_ctl); |
| 1135 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, 0, |
| 1136 | i_size_read(inode) - 1, cached_state, |
| 1137 | GFP_NOFS); |
| 1138 | } |
| 1139 | |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1140 | int btrfs_wait_cache_io(struct btrfs_root *root, |
| 1141 | struct btrfs_trans_handle *trans, |
| 1142 | struct btrfs_block_group_cache *block_group, |
| 1143 | struct btrfs_io_ctl *io_ctl, |
| 1144 | struct btrfs_path *path, u64 offset) |
| 1145 | { |
| 1146 | int ret; |
| 1147 | struct inode *inode = io_ctl->inode; |
| 1148 | |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 1149 | if (!inode) |
| 1150 | return 0; |
| 1151 | |
Chris Mason | 85db36c | 2015-04-23 08:02:49 -0700 | [diff] [blame^] | 1152 | if (block_group) |
| 1153 | root = root->fs_info->tree_root; |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1154 | |
| 1155 | /* Flush the dirty pages in the cache file. */ |
| 1156 | ret = flush_dirty_cache(inode); |
| 1157 | if (ret) |
| 1158 | goto out; |
| 1159 | |
| 1160 | /* Update the cache item to tell everyone this cache file is valid. */ |
| 1161 | ret = update_cache_item(trans, root, inode, path, offset, |
| 1162 | io_ctl->entries, io_ctl->bitmaps); |
| 1163 | out: |
| 1164 | io_ctl_free(io_ctl); |
| 1165 | if (ret) { |
| 1166 | invalidate_inode_pages2(inode->i_mapping); |
| 1167 | BTRFS_I(inode)->generation = 0; |
| 1168 | if (block_group) { |
| 1169 | #ifdef DEBUG |
| 1170 | btrfs_err(root->fs_info, |
| 1171 | "failed to write free space cache for block group %llu", |
| 1172 | block_group->key.objectid); |
| 1173 | #endif |
| 1174 | } |
| 1175 | } |
| 1176 | btrfs_update_inode(trans, root, inode); |
| 1177 | |
| 1178 | if (block_group) { |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 1179 | /* the dirty list is protected by the dirty_bgs_lock */ |
| 1180 | spin_lock(&trans->transaction->dirty_bgs_lock); |
| 1181 | |
| 1182 | /* the disk_cache_state is protected by the block group lock */ |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1183 | spin_lock(&block_group->lock); |
| 1184 | |
| 1185 | /* |
| 1186 | * only mark this as written if we didn't get put back on |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 1187 | * the dirty list while waiting for IO. Otherwise our |
| 1188 | * cache state won't be right, and we won't get written again |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1189 | */ |
| 1190 | if (!ret && list_empty(&block_group->dirty_list)) |
| 1191 | block_group->disk_cache_state = BTRFS_DC_WRITTEN; |
| 1192 | else if (ret) |
| 1193 | block_group->disk_cache_state = BTRFS_DC_ERROR; |
| 1194 | |
| 1195 | spin_unlock(&block_group->lock); |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 1196 | spin_unlock(&trans->transaction->dirty_bgs_lock); |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1197 | io_ctl->inode = NULL; |
| 1198 | iput(inode); |
| 1199 | } |
| 1200 | |
| 1201 | return ret; |
| 1202 | |
| 1203 | } |
| 1204 | |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1205 | /** |
| 1206 | * __btrfs_write_out_cache - write out cached info to an inode |
| 1207 | * @root - the root the inode belongs to |
| 1208 | * @ctl - the free space cache we are going to write out |
| 1209 | * @block_group - the block_group for this cache if it belongs to a block_group |
| 1210 | * @trans - the trans handle |
| 1211 | * @path - the path to use |
| 1212 | * @offset - the offset for the key we'll insert |
| 1213 | * |
| 1214 | * This function writes out a free space cache struct to disk for quick recovery |
| 1215 | * on mount. This will return 0 if it was successfull in writing the cache out, |
| 1216 | * and -1 if it was not. |
| 1217 | */ |
| 1218 | static int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode, |
| 1219 | struct btrfs_free_space_ctl *ctl, |
| 1220 | struct btrfs_block_group_cache *block_group, |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1221 | struct btrfs_io_ctl *io_ctl, |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1222 | struct btrfs_trans_handle *trans, |
| 1223 | struct btrfs_path *path, u64 offset) |
| 1224 | { |
| 1225 | struct extent_state *cached_state = NULL; |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1226 | LIST_HEAD(bitmap_list); |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1227 | int entries = 0; |
| 1228 | int bitmaps = 0; |
| 1229 | int ret; |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1230 | int must_iput = 0; |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1231 | |
| 1232 | if (!i_size_read(inode)) |
| 1233 | return -1; |
| 1234 | |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1235 | WARN_ON(io_ctl->pages); |
| 1236 | ret = io_ctl_init(io_ctl, inode, root, 1); |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1237 | if (ret) |
| 1238 | return -1; |
| 1239 | |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 1240 | if (block_group && (block_group->flags & BTRFS_BLOCK_GROUP_DATA)) { |
| 1241 | down_write(&block_group->data_rwsem); |
| 1242 | spin_lock(&block_group->lock); |
| 1243 | if (block_group->delalloc_bytes) { |
| 1244 | block_group->disk_cache_state = BTRFS_DC_WRITTEN; |
| 1245 | spin_unlock(&block_group->lock); |
| 1246 | up_write(&block_group->data_rwsem); |
| 1247 | BTRFS_I(inode)->generation = 0; |
| 1248 | ret = 0; |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1249 | must_iput = 1; |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 1250 | goto out; |
| 1251 | } |
| 1252 | spin_unlock(&block_group->lock); |
| 1253 | } |
| 1254 | |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1255 | /* Lock all pages first so we can lock the extent safely. */ |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1256 | io_ctl_prepare_pages(io_ctl, inode, 0); |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1257 | |
| 1258 | lock_extent_bits(&BTRFS_I(inode)->io_tree, 0, i_size_read(inode) - 1, |
| 1259 | 0, &cached_state); |
| 1260 | |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1261 | io_ctl_set_generation(io_ctl, trans->transid); |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1262 | |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 1263 | mutex_lock(&ctl->cache_writeout_mutex); |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1264 | /* Write out the extent entries in the free space cache */ |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 1265 | spin_lock(&ctl->tree_lock); |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1266 | ret = write_cache_extent_entries(io_ctl, ctl, |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1267 | block_group, &entries, &bitmaps, |
| 1268 | &bitmap_list); |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 1269 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 1270 | if (ret) { |
| 1271 | mutex_unlock(&ctl->cache_writeout_mutex); |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1272 | goto out_nospc; |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 1273 | } |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1274 | |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1275 | /* |
| 1276 | * Some spaces that are freed in the current transaction are pinned, |
| 1277 | * they will be added into free space cache after the transaction is |
| 1278 | * committed, we shouldn't lose them. |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 1279 | * |
| 1280 | * If this changes while we are working we'll get added back to |
| 1281 | * the dirty list and redo it. No locking needed |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1282 | */ |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1283 | ret = write_pinned_extent_entries(root, block_group, io_ctl, &entries); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 1284 | if (ret) { |
| 1285 | mutex_unlock(&ctl->cache_writeout_mutex); |
Chris Mason | d4452bc | 2014-05-19 20:47:56 -0700 | [diff] [blame] | 1286 | goto out_nospc; |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 1287 | } |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1288 | |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 1289 | /* |
| 1290 | * At last, we write out all the bitmaps and keep cache_writeout_mutex |
| 1291 | * locked while doing it because a concurrent trim can be manipulating |
| 1292 | * or freeing the bitmap. |
| 1293 | */ |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 1294 | spin_lock(&ctl->tree_lock); |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1295 | ret = write_bitmap_entries(io_ctl, &bitmap_list); |
Chris Mason | 1bbc621 | 2015-04-06 12:46:08 -0700 | [diff] [blame] | 1296 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 1297 | mutex_unlock(&ctl->cache_writeout_mutex); |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1298 | if (ret) |
| 1299 | goto out_nospc; |
| 1300 | |
| 1301 | /* Zero out the rest of the pages just to make sure */ |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1302 | io_ctl_zero_remaining_pages(io_ctl); |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1303 | |
| 1304 | /* Everything is written out, now we dirty the pages in the file. */ |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1305 | ret = btrfs_dirty_pages(root, inode, io_ctl->pages, io_ctl->num_pages, |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1306 | 0, i_size_read(inode), &cached_state); |
| 1307 | if (ret) |
| 1308 | goto out_nospc; |
| 1309 | |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 1310 | if (block_group && (block_group->flags & BTRFS_BLOCK_GROUP_DATA)) |
| 1311 | up_write(&block_group->data_rwsem); |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1312 | /* |
| 1313 | * Release the pages and unlock the extent, we will flush |
| 1314 | * them out later |
| 1315 | */ |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1316 | io_ctl_drop_pages(io_ctl); |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1317 | |
| 1318 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, 0, |
| 1319 | i_size_read(inode) - 1, &cached_state, GFP_NOFS); |
| 1320 | |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1321 | /* |
| 1322 | * at this point the pages are under IO and we're happy, |
| 1323 | * The caller is responsible for waiting on them and updating the |
| 1324 | * the cache and the inode |
| 1325 | */ |
| 1326 | io_ctl->entries = entries; |
| 1327 | io_ctl->bitmaps = bitmaps; |
| 1328 | |
| 1329 | ret = btrfs_fdatawrite_range(inode, 0, (u64)-1); |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1330 | if (ret) |
Josef Bacik | 0ef8b72 | 2013-10-25 16:13:35 -0400 | [diff] [blame] | 1331 | goto out; |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1332 | |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1333 | return 0; |
| 1334 | |
Josef Bacik | 2f35612 | 2011-06-10 15:31:13 -0400 | [diff] [blame] | 1335 | out: |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1336 | io_ctl->inode = NULL; |
| 1337 | io_ctl_free(io_ctl); |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1338 | if (ret) { |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 1339 | invalidate_inode_pages2(inode->i_mapping); |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1340 | BTRFS_I(inode)->generation = 0; |
| 1341 | } |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1342 | btrfs_update_inode(trans, root, inode); |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1343 | if (must_iput) |
| 1344 | iput(inode); |
Miao Xie | 5349d6c | 2014-06-19 10:42:49 +0800 | [diff] [blame] | 1345 | return ret; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 1346 | |
| 1347 | out_nospc: |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1348 | cleanup_write_cache_enospc(inode, io_ctl, &cached_state, &bitmap_list); |
Miao Xie | e570fd2 | 2014-06-19 10:42:50 +0800 | [diff] [blame] | 1349 | |
| 1350 | if (block_group && (block_group->flags & BTRFS_BLOCK_GROUP_DATA)) |
| 1351 | up_write(&block_group->data_rwsem); |
| 1352 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 1353 | goto out; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 1354 | } |
| 1355 | |
| 1356 | int btrfs_write_out_cache(struct btrfs_root *root, |
| 1357 | struct btrfs_trans_handle *trans, |
| 1358 | struct btrfs_block_group_cache *block_group, |
| 1359 | struct btrfs_path *path) |
| 1360 | { |
| 1361 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
| 1362 | struct inode *inode; |
| 1363 | int ret = 0; |
| 1364 | |
| 1365 | root = root->fs_info->tree_root; |
| 1366 | |
| 1367 | spin_lock(&block_group->lock); |
| 1368 | if (block_group->disk_cache_state < BTRFS_DC_SETUP) { |
| 1369 | spin_unlock(&block_group->lock); |
| 1370 | return 0; |
| 1371 | } |
| 1372 | spin_unlock(&block_group->lock); |
| 1373 | |
| 1374 | inode = lookup_free_space_inode(root, block_group, path); |
| 1375 | if (IS_ERR(inode)) |
| 1376 | return 0; |
| 1377 | |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1378 | ret = __btrfs_write_out_cache(root, inode, ctl, block_group, |
| 1379 | &block_group->io_ctl, trans, |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 1380 | path, block_group->key.objectid); |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 1381 | if (ret) { |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 1382 | #ifdef DEBUG |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 1383 | btrfs_err(root->fs_info, |
| 1384 | "failed to write free space cache for block group %llu", |
| 1385 | block_group->key.objectid); |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 1386 | #endif |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1387 | spin_lock(&block_group->lock); |
| 1388 | block_group->disk_cache_state = BTRFS_DC_ERROR; |
| 1389 | spin_unlock(&block_group->lock); |
| 1390 | |
| 1391 | block_group->io_ctl.inode = NULL; |
| 1392 | iput(inode); |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 1393 | } |
| 1394 | |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 1395 | /* |
| 1396 | * if ret == 0 the caller is expected to call btrfs_wait_cache_io |
| 1397 | * to wait for IO and put the inode |
| 1398 | */ |
| 1399 | |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1400 | return ret; |
| 1401 | } |
| 1402 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1403 | static inline unsigned long offset_to_bit(u64 bitmap_start, u32 unit, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1404 | u64 offset) |
| 1405 | { |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 1406 | ASSERT(offset >= bitmap_start); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1407 | offset -= bitmap_start; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1408 | return (unsigned long)(div_u64(offset, unit)); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1409 | } |
| 1410 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1411 | static inline unsigned long bytes_to_bits(u64 bytes, u32 unit) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1412 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1413 | return (unsigned long)(div_u64(bytes, unit)); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1414 | } |
| 1415 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1416 | static inline u64 offset_to_bitmap(struct btrfs_free_space_ctl *ctl, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1417 | u64 offset) |
| 1418 | { |
| 1419 | u64 bitmap_start; |
David Sterba | b8b93ad | 2015-01-16 17:26:13 +0100 | [diff] [blame] | 1420 | u32 bytes_per_bitmap; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1421 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1422 | bytes_per_bitmap = BITS_PER_BITMAP * ctl->unit; |
| 1423 | bitmap_start = offset - ctl->start; |
David Sterba | b8b93ad | 2015-01-16 17:26:13 +0100 | [diff] [blame] | 1424 | bitmap_start = div_u64(bitmap_start, bytes_per_bitmap); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1425 | bitmap_start *= bytes_per_bitmap; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1426 | bitmap_start += ctl->start; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1427 | |
| 1428 | return bitmap_start; |
| 1429 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1430 | |
| 1431 | static int tree_insert_offset(struct rb_root *root, u64 offset, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1432 | struct rb_node *node, int bitmap) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1433 | { |
| 1434 | struct rb_node **p = &root->rb_node; |
| 1435 | struct rb_node *parent = NULL; |
| 1436 | struct btrfs_free_space *info; |
| 1437 | |
| 1438 | while (*p) { |
| 1439 | parent = *p; |
| 1440 | info = rb_entry(parent, struct btrfs_free_space, offset_index); |
| 1441 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1442 | if (offset < info->offset) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1443 | p = &(*p)->rb_left; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1444 | } else if (offset > info->offset) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1445 | p = &(*p)->rb_right; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1446 | } else { |
| 1447 | /* |
| 1448 | * we could have a bitmap entry and an extent entry |
| 1449 | * share the same offset. If this is the case, we want |
| 1450 | * the extent entry to always be found first if we do a |
| 1451 | * linear search through the tree, since we want to have |
| 1452 | * the quickest allocation time, and allocating from an |
| 1453 | * extent is faster than allocating from a bitmap. So |
| 1454 | * if we're inserting a bitmap and we find an entry at |
| 1455 | * this offset, we want to go right, or after this entry |
| 1456 | * logically. If we are inserting an extent and we've |
| 1457 | * found a bitmap, we want to go left, or before |
| 1458 | * logically. |
| 1459 | */ |
| 1460 | if (bitmap) { |
Josef Bacik | 207dde8 | 2011-05-13 14:49:23 -0400 | [diff] [blame] | 1461 | if (info->bitmap) { |
| 1462 | WARN_ON_ONCE(1); |
| 1463 | return -EEXIST; |
| 1464 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1465 | p = &(*p)->rb_right; |
| 1466 | } else { |
Josef Bacik | 207dde8 | 2011-05-13 14:49:23 -0400 | [diff] [blame] | 1467 | if (!info->bitmap) { |
| 1468 | WARN_ON_ONCE(1); |
| 1469 | return -EEXIST; |
| 1470 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1471 | p = &(*p)->rb_left; |
| 1472 | } |
| 1473 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1474 | } |
| 1475 | |
| 1476 | rb_link_node(node, parent, p); |
| 1477 | rb_insert_color(node, root); |
| 1478 | |
| 1479 | return 0; |
| 1480 | } |
| 1481 | |
| 1482 | /* |
Josef Bacik | 70cb074 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 1483 | * searches the tree for the given offset. |
| 1484 | * |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1485 | * fuzzy - If this is set, then we are trying to make an allocation, and we just |
| 1486 | * want a section that has at least bytes size and comes at or after the given |
| 1487 | * offset. |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1488 | */ |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1489 | static struct btrfs_free_space * |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1490 | tree_search_offset(struct btrfs_free_space_ctl *ctl, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1491 | u64 offset, int bitmap_only, int fuzzy) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1492 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1493 | struct rb_node *n = ctl->free_space_offset.rb_node; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1494 | struct btrfs_free_space *entry, *prev = NULL; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1495 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1496 | /* find entry that is closest to the 'offset' */ |
| 1497 | while (1) { |
| 1498 | if (!n) { |
| 1499 | entry = NULL; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1500 | break; |
| 1501 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1502 | |
| 1503 | entry = rb_entry(n, struct btrfs_free_space, offset_index); |
| 1504 | prev = entry; |
| 1505 | |
| 1506 | if (offset < entry->offset) |
| 1507 | n = n->rb_left; |
| 1508 | else if (offset > entry->offset) |
| 1509 | n = n->rb_right; |
| 1510 | else |
| 1511 | break; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1512 | } |
| 1513 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1514 | if (bitmap_only) { |
| 1515 | if (!entry) |
| 1516 | return NULL; |
| 1517 | if (entry->bitmap) |
| 1518 | return entry; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1519 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1520 | /* |
| 1521 | * bitmap entry and extent entry may share same offset, |
| 1522 | * in that case, bitmap entry comes after extent entry. |
| 1523 | */ |
| 1524 | n = rb_next(n); |
| 1525 | if (!n) |
| 1526 | return NULL; |
| 1527 | entry = rb_entry(n, struct btrfs_free_space, offset_index); |
| 1528 | if (entry->offset != offset) |
| 1529 | return NULL; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1530 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1531 | WARN_ON(!entry->bitmap); |
| 1532 | return entry; |
| 1533 | } else if (entry) { |
| 1534 | if (entry->bitmap) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1535 | /* |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1536 | * if previous extent entry covers the offset, |
| 1537 | * we should return it instead of the bitmap entry |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1538 | */ |
Miao Xie | de6c411 | 2012-10-18 08:18:01 +0000 | [diff] [blame] | 1539 | n = rb_prev(&entry->offset_index); |
| 1540 | if (n) { |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1541 | prev = rb_entry(n, struct btrfs_free_space, |
| 1542 | offset_index); |
Miao Xie | de6c411 | 2012-10-18 08:18:01 +0000 | [diff] [blame] | 1543 | if (!prev->bitmap && |
| 1544 | prev->offset + prev->bytes > offset) |
| 1545 | entry = prev; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1546 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1547 | } |
| 1548 | return entry; |
| 1549 | } |
| 1550 | |
| 1551 | if (!prev) |
| 1552 | return NULL; |
| 1553 | |
| 1554 | /* find last entry before the 'offset' */ |
| 1555 | entry = prev; |
| 1556 | if (entry->offset > offset) { |
| 1557 | n = rb_prev(&entry->offset_index); |
| 1558 | if (n) { |
| 1559 | entry = rb_entry(n, struct btrfs_free_space, |
| 1560 | offset_index); |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 1561 | ASSERT(entry->offset <= offset); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1562 | } else { |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1563 | if (fuzzy) |
| 1564 | return entry; |
| 1565 | else |
| 1566 | return NULL; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1567 | } |
| 1568 | } |
| 1569 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1570 | if (entry->bitmap) { |
Miao Xie | de6c411 | 2012-10-18 08:18:01 +0000 | [diff] [blame] | 1571 | n = rb_prev(&entry->offset_index); |
| 1572 | if (n) { |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1573 | prev = rb_entry(n, struct btrfs_free_space, |
| 1574 | offset_index); |
Miao Xie | de6c411 | 2012-10-18 08:18:01 +0000 | [diff] [blame] | 1575 | if (!prev->bitmap && |
| 1576 | prev->offset + prev->bytes > offset) |
| 1577 | return prev; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1578 | } |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1579 | if (entry->offset + BITS_PER_BITMAP * ctl->unit > offset) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1580 | return entry; |
| 1581 | } else if (entry->offset + entry->bytes > offset) |
| 1582 | return entry; |
| 1583 | |
| 1584 | if (!fuzzy) |
| 1585 | return NULL; |
| 1586 | |
| 1587 | while (1) { |
| 1588 | if (entry->bitmap) { |
| 1589 | if (entry->offset + BITS_PER_BITMAP * |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1590 | ctl->unit > offset) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1591 | break; |
| 1592 | } else { |
| 1593 | if (entry->offset + entry->bytes > offset) |
| 1594 | break; |
| 1595 | } |
| 1596 | |
| 1597 | n = rb_next(&entry->offset_index); |
| 1598 | if (!n) |
| 1599 | return NULL; |
| 1600 | entry = rb_entry(n, struct btrfs_free_space, offset_index); |
| 1601 | } |
| 1602 | return entry; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1603 | } |
| 1604 | |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 1605 | static inline void |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1606 | __unlink_free_space(struct btrfs_free_space_ctl *ctl, |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 1607 | struct btrfs_free_space *info) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1608 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1609 | rb_erase(&info->offset_index, &ctl->free_space_offset); |
| 1610 | ctl->free_extents--; |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 1611 | } |
| 1612 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1613 | static void unlink_free_space(struct btrfs_free_space_ctl *ctl, |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 1614 | struct btrfs_free_space *info) |
| 1615 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1616 | __unlink_free_space(ctl, info); |
| 1617 | ctl->free_space -= info->bytes; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1618 | } |
| 1619 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1620 | static int link_free_space(struct btrfs_free_space_ctl *ctl, |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1621 | struct btrfs_free_space *info) |
| 1622 | { |
| 1623 | int ret = 0; |
| 1624 | |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 1625 | ASSERT(info->bytes || info->bitmap); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1626 | ret = tree_insert_offset(&ctl->free_space_offset, info->offset, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1627 | &info->offset_index, (info->bitmap != NULL)); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1628 | if (ret) |
| 1629 | return ret; |
| 1630 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1631 | ctl->free_space += info->bytes; |
| 1632 | ctl->free_extents++; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1633 | return ret; |
| 1634 | } |
| 1635 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1636 | static void recalculate_thresholds(struct btrfs_free_space_ctl *ctl) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1637 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1638 | struct btrfs_block_group_cache *block_group = ctl->private; |
Josef Bacik | 25891f7 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 1639 | u64 max_bytes; |
| 1640 | u64 bitmap_bytes; |
| 1641 | u64 extent_bytes; |
Li Zefan | 8eb2d82 | 2010-11-09 14:48:01 +0800 | [diff] [blame] | 1642 | u64 size = block_group->key.offset; |
David Sterba | b8b93ad | 2015-01-16 17:26:13 +0100 | [diff] [blame] | 1643 | u32 bytes_per_bg = BITS_PER_BITMAP * ctl->unit; |
| 1644 | u32 max_bitmaps = div_u64(size + bytes_per_bg - 1, bytes_per_bg); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1645 | |
David Sterba | b8b93ad | 2015-01-16 17:26:13 +0100 | [diff] [blame] | 1646 | max_bitmaps = max_t(u32, max_bitmaps, 1); |
Josef Bacik | dde5740 | 2013-02-12 14:07:51 -0500 | [diff] [blame] | 1647 | |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 1648 | ASSERT(ctl->total_bitmaps <= max_bitmaps); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1649 | |
| 1650 | /* |
| 1651 | * The goal is to keep the total amount of memory used per 1gb of space |
| 1652 | * at or below 32k, so we need to adjust how much memory we allow to be |
| 1653 | * used by extent based free space tracking |
| 1654 | */ |
Li Zefan | 8eb2d82 | 2010-11-09 14:48:01 +0800 | [diff] [blame] | 1655 | if (size < 1024 * 1024 * 1024) |
| 1656 | max_bytes = MAX_CACHE_BYTES_PER_GIG; |
| 1657 | else |
| 1658 | max_bytes = MAX_CACHE_BYTES_PER_GIG * |
David Sterba | f8c269d | 2015-01-16 17:21:12 +0100 | [diff] [blame] | 1659 | div_u64(size, 1024 * 1024 * 1024); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1660 | |
Josef Bacik | 25891f7 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 1661 | /* |
| 1662 | * we want to account for 1 more bitmap than what we have so we can make |
| 1663 | * sure we don't go over our overall goal of MAX_CACHE_BYTES_PER_GIG as |
| 1664 | * we add more bitmaps. |
| 1665 | */ |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1666 | bitmap_bytes = (ctl->total_bitmaps + 1) * PAGE_CACHE_SIZE; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1667 | |
Josef Bacik | 25891f7 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 1668 | if (bitmap_bytes >= max_bytes) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1669 | ctl->extents_thresh = 0; |
Josef Bacik | 25891f7 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 1670 | return; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1671 | } |
Josef Bacik | 25891f7 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 1672 | |
| 1673 | /* |
David Sterba | f8c269d | 2015-01-16 17:21:12 +0100 | [diff] [blame] | 1674 | * we want the extent entry threshold to always be at most 1/2 the max |
Josef Bacik | 25891f7 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 1675 | * bytes we can have, or whatever is less than that. |
| 1676 | */ |
| 1677 | extent_bytes = max_bytes - bitmap_bytes; |
David Sterba | f8c269d | 2015-01-16 17:21:12 +0100 | [diff] [blame] | 1678 | extent_bytes = min_t(u64, extent_bytes, max_bytes >> 1); |
Josef Bacik | 25891f7 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 1679 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1680 | ctl->extents_thresh = |
David Sterba | f8c269d | 2015-01-16 17:21:12 +0100 | [diff] [blame] | 1681 | div_u64(extent_bytes, sizeof(struct btrfs_free_space)); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1682 | } |
| 1683 | |
Miao Xie | bb3ac5a | 2011-08-05 09:32:35 +0000 | [diff] [blame] | 1684 | static inline void __bitmap_clear_bits(struct btrfs_free_space_ctl *ctl, |
| 1685 | struct btrfs_free_space *info, |
| 1686 | u64 offset, u64 bytes) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1687 | { |
Li Zefan | f38b6e7 | 2011-03-14 13:40:51 +0800 | [diff] [blame] | 1688 | unsigned long start, count; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1689 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1690 | start = offset_to_bit(info->offset, ctl->unit, offset); |
| 1691 | count = bytes_to_bits(bytes, ctl->unit); |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 1692 | ASSERT(start + count <= BITS_PER_BITMAP); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1693 | |
Li Zefan | f38b6e7 | 2011-03-14 13:40:51 +0800 | [diff] [blame] | 1694 | bitmap_clear(info->bitmap, start, count); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1695 | |
| 1696 | info->bytes -= bytes; |
Miao Xie | bb3ac5a | 2011-08-05 09:32:35 +0000 | [diff] [blame] | 1697 | } |
| 1698 | |
| 1699 | static void bitmap_clear_bits(struct btrfs_free_space_ctl *ctl, |
| 1700 | struct btrfs_free_space *info, u64 offset, |
| 1701 | u64 bytes) |
| 1702 | { |
| 1703 | __bitmap_clear_bits(ctl, info, offset, bytes); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1704 | ctl->free_space -= bytes; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1705 | } |
| 1706 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1707 | static void bitmap_set_bits(struct btrfs_free_space_ctl *ctl, |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1708 | struct btrfs_free_space *info, u64 offset, |
| 1709 | u64 bytes) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1710 | { |
Li Zefan | f38b6e7 | 2011-03-14 13:40:51 +0800 | [diff] [blame] | 1711 | unsigned long start, count; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1712 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1713 | start = offset_to_bit(info->offset, ctl->unit, offset); |
| 1714 | count = bytes_to_bits(bytes, ctl->unit); |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 1715 | ASSERT(start + count <= BITS_PER_BITMAP); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1716 | |
Li Zefan | f38b6e7 | 2011-03-14 13:40:51 +0800 | [diff] [blame] | 1717 | bitmap_set(info->bitmap, start, count); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1718 | |
| 1719 | info->bytes += bytes; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1720 | ctl->free_space += bytes; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1721 | } |
| 1722 | |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1723 | /* |
| 1724 | * If we can not find suitable extent, we will use bytes to record |
| 1725 | * the size of the max extent. |
| 1726 | */ |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1727 | static int search_bitmap(struct btrfs_free_space_ctl *ctl, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1728 | struct btrfs_free_space *bitmap_info, u64 *offset, |
| 1729 | u64 *bytes) |
| 1730 | { |
| 1731 | unsigned long found_bits = 0; |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1732 | unsigned long max_bits = 0; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1733 | unsigned long bits, i; |
| 1734 | unsigned long next_zero; |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1735 | unsigned long extent_bits; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1736 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1737 | i = offset_to_bit(bitmap_info->offset, ctl->unit, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1738 | max_t(u64, *offset, bitmap_info->offset)); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1739 | bits = bytes_to_bits(*bytes, ctl->unit); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1740 | |
Wei Yongjun | ebb3dad | 2012-09-13 20:29:02 -0600 | [diff] [blame] | 1741 | for_each_set_bit_from(i, bitmap_info->bitmap, BITS_PER_BITMAP) { |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1742 | next_zero = find_next_zero_bit(bitmap_info->bitmap, |
| 1743 | BITS_PER_BITMAP, i); |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1744 | extent_bits = next_zero - i; |
| 1745 | if (extent_bits >= bits) { |
| 1746 | found_bits = extent_bits; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1747 | break; |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1748 | } else if (extent_bits > max_bits) { |
| 1749 | max_bits = extent_bits; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1750 | } |
| 1751 | i = next_zero; |
| 1752 | } |
| 1753 | |
| 1754 | if (found_bits) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1755 | *offset = (u64)(i * ctl->unit) + bitmap_info->offset; |
| 1756 | *bytes = (u64)(found_bits) * ctl->unit; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1757 | return 0; |
| 1758 | } |
| 1759 | |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1760 | *bytes = (u64)(max_bits) * ctl->unit; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1761 | return -1; |
| 1762 | } |
| 1763 | |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1764 | /* Cache the size of the max extent in bytes */ |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1765 | static struct btrfs_free_space * |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 1766 | find_free_space(struct btrfs_free_space_ctl *ctl, u64 *offset, u64 *bytes, |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1767 | unsigned long align, u64 *max_extent_size) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1768 | { |
| 1769 | struct btrfs_free_space *entry; |
| 1770 | struct rb_node *node; |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 1771 | u64 tmp; |
| 1772 | u64 align_off; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1773 | int ret; |
| 1774 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1775 | if (!ctl->free_space_offset.rb_node) |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1776 | goto out; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1777 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1778 | entry = tree_search_offset(ctl, offset_to_bitmap(ctl, *offset), 0, 1); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1779 | if (!entry) |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1780 | goto out; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1781 | |
| 1782 | for (node = &entry->offset_index; node; node = rb_next(node)) { |
| 1783 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1784 | if (entry->bytes < *bytes) { |
| 1785 | if (entry->bytes > *max_extent_size) |
| 1786 | *max_extent_size = entry->bytes; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1787 | continue; |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1788 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1789 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 1790 | /* make sure the space returned is big enough |
| 1791 | * to match our requested alignment |
| 1792 | */ |
| 1793 | if (*bytes >= align) { |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1794 | tmp = entry->offset - ctl->start + align - 1; |
David Sterba | 47c5713 | 2015-02-20 18:43:47 +0100 | [diff] [blame] | 1795 | tmp = div64_u64(tmp, align); |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 1796 | tmp = tmp * align + ctl->start; |
| 1797 | align_off = tmp - entry->offset; |
| 1798 | } else { |
| 1799 | align_off = 0; |
| 1800 | tmp = entry->offset; |
| 1801 | } |
| 1802 | |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1803 | if (entry->bytes < *bytes + align_off) { |
| 1804 | if (entry->bytes > *max_extent_size) |
| 1805 | *max_extent_size = entry->bytes; |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 1806 | continue; |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1807 | } |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 1808 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1809 | if (entry->bitmap) { |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1810 | u64 size = *bytes; |
| 1811 | |
| 1812 | ret = search_bitmap(ctl, entry, &tmp, &size); |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 1813 | if (!ret) { |
| 1814 | *offset = tmp; |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1815 | *bytes = size; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1816 | return entry; |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1817 | } else if (size > *max_extent_size) { |
| 1818 | *max_extent_size = size; |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 1819 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1820 | continue; |
| 1821 | } |
| 1822 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 1823 | *offset = tmp; |
| 1824 | *bytes = entry->bytes - align_off; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1825 | return entry; |
| 1826 | } |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 1827 | out: |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1828 | return NULL; |
| 1829 | } |
| 1830 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1831 | static void add_new_bitmap(struct btrfs_free_space_ctl *ctl, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1832 | struct btrfs_free_space *info, u64 offset) |
| 1833 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1834 | info->offset = offset_to_bitmap(ctl, offset); |
Josef Bacik | f019f42 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 1835 | info->bytes = 0; |
Alexandre Oliva | f2d0f67 | 2011-11-28 12:04:43 -0200 | [diff] [blame] | 1836 | INIT_LIST_HEAD(&info->list); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1837 | link_free_space(ctl, info); |
| 1838 | ctl->total_bitmaps++; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1839 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1840 | ctl->op->recalc_thresholds(ctl); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1841 | } |
| 1842 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1843 | static void free_bitmap(struct btrfs_free_space_ctl *ctl, |
Li Zefan | edf6e2d | 2010-11-09 14:50:07 +0800 | [diff] [blame] | 1844 | struct btrfs_free_space *bitmap_info) |
| 1845 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1846 | unlink_free_space(ctl, bitmap_info); |
Li Zefan | edf6e2d | 2010-11-09 14:50:07 +0800 | [diff] [blame] | 1847 | kfree(bitmap_info->bitmap); |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 1848 | kmem_cache_free(btrfs_free_space_cachep, bitmap_info); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1849 | ctl->total_bitmaps--; |
| 1850 | ctl->op->recalc_thresholds(ctl); |
Li Zefan | edf6e2d | 2010-11-09 14:50:07 +0800 | [diff] [blame] | 1851 | } |
| 1852 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1853 | static noinline int remove_from_bitmap(struct btrfs_free_space_ctl *ctl, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1854 | struct btrfs_free_space *bitmap_info, |
| 1855 | u64 *offset, u64 *bytes) |
| 1856 | { |
| 1857 | u64 end; |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1858 | u64 search_start, search_bytes; |
| 1859 | int ret; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1860 | |
| 1861 | again: |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1862 | end = bitmap_info->offset + (u64)(BITS_PER_BITMAP * ctl->unit) - 1; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1863 | |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1864 | /* |
Josef Bacik | bdb7d30 | 2012-06-27 15:10:56 -0400 | [diff] [blame] | 1865 | * We need to search for bits in this bitmap. We could only cover some |
| 1866 | * of the extent in this bitmap thanks to how we add space, so we need |
| 1867 | * to search for as much as it as we can and clear that amount, and then |
| 1868 | * go searching for the next bit. |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1869 | */ |
| 1870 | search_start = *offset; |
Josef Bacik | bdb7d30 | 2012-06-27 15:10:56 -0400 | [diff] [blame] | 1871 | search_bytes = ctl->unit; |
Josef Bacik | 13dbc08 | 2011-02-03 02:39:52 +0000 | [diff] [blame] | 1872 | search_bytes = min(search_bytes, end - search_start + 1); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1873 | ret = search_bitmap(ctl, bitmap_info, &search_start, &search_bytes); |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 1874 | if (ret < 0 || search_start != *offset) |
| 1875 | return -EINVAL; |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1876 | |
Josef Bacik | bdb7d30 | 2012-06-27 15:10:56 -0400 | [diff] [blame] | 1877 | /* We may have found more bits than what we need */ |
| 1878 | search_bytes = min(search_bytes, *bytes); |
| 1879 | |
| 1880 | /* Cannot clear past the end of the bitmap */ |
| 1881 | search_bytes = min(search_bytes, end - search_start + 1); |
| 1882 | |
| 1883 | bitmap_clear_bits(ctl, bitmap_info, search_start, search_bytes); |
| 1884 | *offset += search_bytes; |
| 1885 | *bytes -= search_bytes; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1886 | |
| 1887 | if (*bytes) { |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1888 | struct rb_node *next = rb_next(&bitmap_info->offset_index); |
Li Zefan | edf6e2d | 2010-11-09 14:50:07 +0800 | [diff] [blame] | 1889 | if (!bitmap_info->bytes) |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1890 | free_bitmap(ctl, bitmap_info); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1891 | |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1892 | /* |
| 1893 | * no entry after this bitmap, but we still have bytes to |
| 1894 | * remove, so something has gone wrong. |
| 1895 | */ |
| 1896 | if (!next) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1897 | return -EINVAL; |
| 1898 | |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1899 | bitmap_info = rb_entry(next, struct btrfs_free_space, |
| 1900 | offset_index); |
| 1901 | |
| 1902 | /* |
| 1903 | * if the next entry isn't a bitmap we need to return to let the |
| 1904 | * extent stuff do its work. |
| 1905 | */ |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1906 | if (!bitmap_info->bitmap) |
| 1907 | return -EAGAIN; |
| 1908 | |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1909 | /* |
| 1910 | * Ok the next item is a bitmap, but it may not actually hold |
| 1911 | * the information for the rest of this free space stuff, so |
| 1912 | * look for it, and if we don't find it return so we can try |
| 1913 | * everything over again. |
| 1914 | */ |
| 1915 | search_start = *offset; |
Josef Bacik | bdb7d30 | 2012-06-27 15:10:56 -0400 | [diff] [blame] | 1916 | search_bytes = ctl->unit; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1917 | ret = search_bitmap(ctl, bitmap_info, &search_start, |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1918 | &search_bytes); |
| 1919 | if (ret < 0 || search_start != *offset) |
| 1920 | return -EAGAIN; |
| 1921 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1922 | goto again; |
Li Zefan | edf6e2d | 2010-11-09 14:50:07 +0800 | [diff] [blame] | 1923 | } else if (!bitmap_info->bytes) |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1924 | free_bitmap(ctl, bitmap_info); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1925 | |
| 1926 | return 0; |
| 1927 | } |
| 1928 | |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 1929 | static u64 add_bytes_to_bitmap(struct btrfs_free_space_ctl *ctl, |
| 1930 | struct btrfs_free_space *info, u64 offset, |
| 1931 | u64 bytes) |
| 1932 | { |
| 1933 | u64 bytes_to_set = 0; |
| 1934 | u64 end; |
| 1935 | |
| 1936 | end = info->offset + (u64)(BITS_PER_BITMAP * ctl->unit); |
| 1937 | |
| 1938 | bytes_to_set = min(end - offset, bytes); |
| 1939 | |
| 1940 | bitmap_set_bits(ctl, info, offset, bytes_to_set); |
| 1941 | |
| 1942 | return bytes_to_set; |
| 1943 | |
| 1944 | } |
| 1945 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1946 | static bool use_bitmap(struct btrfs_free_space_ctl *ctl, |
| 1947 | struct btrfs_free_space *info) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1948 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1949 | struct btrfs_block_group_cache *block_group = ctl->private; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1950 | |
| 1951 | /* |
| 1952 | * If we are below the extents threshold then we can add this as an |
| 1953 | * extent, and don't have to deal with the bitmap |
| 1954 | */ |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1955 | if (ctl->free_extents < ctl->extents_thresh) { |
Josef Bacik | 32cb084 | 2011-03-18 16:16:21 -0400 | [diff] [blame] | 1956 | /* |
| 1957 | * If this block group has some small extents we don't want to |
| 1958 | * use up all of our free slots in the cache with them, we want |
| 1959 | * to reserve them to larger extents, however if we have plent |
| 1960 | * of cache left then go ahead an dadd them, no sense in adding |
| 1961 | * the overhead of a bitmap if we don't have to. |
| 1962 | */ |
| 1963 | if (info->bytes <= block_group->sectorsize * 4) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1964 | if (ctl->free_extents * 2 <= ctl->extents_thresh) |
| 1965 | return false; |
Josef Bacik | 32cb084 | 2011-03-18 16:16:21 -0400 | [diff] [blame] | 1966 | } else { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1967 | return false; |
Josef Bacik | 32cb084 | 2011-03-18 16:16:21 -0400 | [diff] [blame] | 1968 | } |
| 1969 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1970 | |
| 1971 | /* |
Josef Bacik | dde5740 | 2013-02-12 14:07:51 -0500 | [diff] [blame] | 1972 | * The original block groups from mkfs can be really small, like 8 |
| 1973 | * megabytes, so don't bother with a bitmap for those entries. However |
| 1974 | * some block groups can be smaller than what a bitmap would cover but |
| 1975 | * are still large enough that they could overflow the 32k memory limit, |
| 1976 | * so allow those block groups to still be allowed to have a bitmap |
| 1977 | * entry. |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1978 | */ |
Josef Bacik | dde5740 | 2013-02-12 14:07:51 -0500 | [diff] [blame] | 1979 | if (((BITS_PER_BITMAP * ctl->unit) >> 1) > block_group->key.offset) |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1980 | return false; |
| 1981 | |
| 1982 | return true; |
| 1983 | } |
| 1984 | |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 1985 | static struct btrfs_free_space_op free_space_op = { |
| 1986 | .recalc_thresholds = recalculate_thresholds, |
| 1987 | .use_bitmap = use_bitmap, |
| 1988 | }; |
| 1989 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1990 | static int insert_into_bitmap(struct btrfs_free_space_ctl *ctl, |
| 1991 | struct btrfs_free_space *info) |
| 1992 | { |
| 1993 | struct btrfs_free_space *bitmap_info; |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 1994 | struct btrfs_block_group_cache *block_group = NULL; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1995 | int added = 0; |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 1996 | u64 bytes, offset, bytes_added; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1997 | int ret; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1998 | |
| 1999 | bytes = info->bytes; |
| 2000 | offset = info->offset; |
| 2001 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2002 | if (!ctl->op->use_bitmap(ctl, info)) |
| 2003 | return 0; |
| 2004 | |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 2005 | if (ctl->op == &free_space_op) |
| 2006 | block_group = ctl->private; |
Chris Mason | 38e8788 | 2011-06-10 16:36:57 -0400 | [diff] [blame] | 2007 | again: |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 2008 | /* |
| 2009 | * Since we link bitmaps right into the cluster we need to see if we |
| 2010 | * have a cluster here, and if so and it has our bitmap we need to add |
| 2011 | * the free space to that bitmap. |
| 2012 | */ |
| 2013 | if (block_group && !list_empty(&block_group->cluster_list)) { |
| 2014 | struct btrfs_free_cluster *cluster; |
| 2015 | struct rb_node *node; |
| 2016 | struct btrfs_free_space *entry; |
| 2017 | |
| 2018 | cluster = list_entry(block_group->cluster_list.next, |
| 2019 | struct btrfs_free_cluster, |
| 2020 | block_group_list); |
| 2021 | spin_lock(&cluster->lock); |
| 2022 | node = rb_first(&cluster->root); |
| 2023 | if (!node) { |
| 2024 | spin_unlock(&cluster->lock); |
Chris Mason | 38e8788 | 2011-06-10 16:36:57 -0400 | [diff] [blame] | 2025 | goto no_cluster_bitmap; |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 2026 | } |
| 2027 | |
| 2028 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
| 2029 | if (!entry->bitmap) { |
| 2030 | spin_unlock(&cluster->lock); |
Chris Mason | 38e8788 | 2011-06-10 16:36:57 -0400 | [diff] [blame] | 2031 | goto no_cluster_bitmap; |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 2032 | } |
| 2033 | |
| 2034 | if (entry->offset == offset_to_bitmap(ctl, offset)) { |
| 2035 | bytes_added = add_bytes_to_bitmap(ctl, entry, |
| 2036 | offset, bytes); |
| 2037 | bytes -= bytes_added; |
| 2038 | offset += bytes_added; |
| 2039 | } |
| 2040 | spin_unlock(&cluster->lock); |
| 2041 | if (!bytes) { |
| 2042 | ret = 1; |
| 2043 | goto out; |
| 2044 | } |
| 2045 | } |
Chris Mason | 38e8788 | 2011-06-10 16:36:57 -0400 | [diff] [blame] | 2046 | |
| 2047 | no_cluster_bitmap: |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2048 | bitmap_info = tree_search_offset(ctl, offset_to_bitmap(ctl, offset), |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2049 | 1, 0); |
| 2050 | if (!bitmap_info) { |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 2051 | ASSERT(added == 0); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2052 | goto new_bitmap; |
| 2053 | } |
| 2054 | |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 2055 | bytes_added = add_bytes_to_bitmap(ctl, bitmap_info, offset, bytes); |
| 2056 | bytes -= bytes_added; |
| 2057 | offset += bytes_added; |
| 2058 | added = 0; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2059 | |
| 2060 | if (!bytes) { |
| 2061 | ret = 1; |
| 2062 | goto out; |
| 2063 | } else |
| 2064 | goto again; |
| 2065 | |
| 2066 | new_bitmap: |
| 2067 | if (info && info->bitmap) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2068 | add_new_bitmap(ctl, info, offset); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2069 | added = 1; |
| 2070 | info = NULL; |
| 2071 | goto again; |
| 2072 | } else { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2073 | spin_unlock(&ctl->tree_lock); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2074 | |
| 2075 | /* no pre-allocated info, allocate a new one */ |
| 2076 | if (!info) { |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 2077 | info = kmem_cache_zalloc(btrfs_free_space_cachep, |
| 2078 | GFP_NOFS); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2079 | if (!info) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2080 | spin_lock(&ctl->tree_lock); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2081 | ret = -ENOMEM; |
| 2082 | goto out; |
| 2083 | } |
| 2084 | } |
| 2085 | |
| 2086 | /* allocate the bitmap */ |
| 2087 | info->bitmap = kzalloc(PAGE_CACHE_SIZE, GFP_NOFS); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2088 | spin_lock(&ctl->tree_lock); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2089 | if (!info->bitmap) { |
| 2090 | ret = -ENOMEM; |
| 2091 | goto out; |
| 2092 | } |
| 2093 | goto again; |
| 2094 | } |
| 2095 | |
| 2096 | out: |
| 2097 | if (info) { |
| 2098 | if (info->bitmap) |
| 2099 | kfree(info->bitmap); |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 2100 | kmem_cache_free(btrfs_free_space_cachep, info); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2101 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2102 | |
| 2103 | return ret; |
| 2104 | } |
| 2105 | |
Chris Mason | 945d896 | 2011-05-22 12:33:42 -0400 | [diff] [blame] | 2106 | static bool try_merge_free_space(struct btrfs_free_space_ctl *ctl, |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 2107 | struct btrfs_free_space *info, bool update_stat) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2108 | { |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 2109 | struct btrfs_free_space *left_info; |
| 2110 | struct btrfs_free_space *right_info; |
| 2111 | bool merged = false; |
| 2112 | u64 offset = info->offset; |
| 2113 | u64 bytes = info->bytes; |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2114 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2115 | /* |
| 2116 | * first we want to see if there is free space adjacent to the range we |
| 2117 | * are adding, if there is remove that struct and add a new one to |
| 2118 | * cover the entire range |
| 2119 | */ |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2120 | right_info = tree_search_offset(ctl, offset + bytes, 0, 0); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2121 | if (right_info && rb_prev(&right_info->offset_index)) |
| 2122 | left_info = rb_entry(rb_prev(&right_info->offset_index), |
| 2123 | struct btrfs_free_space, offset_index); |
| 2124 | else |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2125 | left_info = tree_search_offset(ctl, offset - 1, 0, 0); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2126 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2127 | if (right_info && !right_info->bitmap) { |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 2128 | if (update_stat) |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2129 | unlink_free_space(ctl, right_info); |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 2130 | else |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2131 | __unlink_free_space(ctl, right_info); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2132 | info->bytes += right_info->bytes; |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 2133 | kmem_cache_free(btrfs_free_space_cachep, right_info); |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 2134 | merged = true; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2135 | } |
| 2136 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2137 | if (left_info && !left_info->bitmap && |
| 2138 | left_info->offset + left_info->bytes == offset) { |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 2139 | if (update_stat) |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2140 | unlink_free_space(ctl, left_info); |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 2141 | else |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2142 | __unlink_free_space(ctl, left_info); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2143 | info->offset = left_info->offset; |
| 2144 | info->bytes += left_info->bytes; |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 2145 | kmem_cache_free(btrfs_free_space_cachep, left_info); |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 2146 | merged = true; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2147 | } |
| 2148 | |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 2149 | return merged; |
| 2150 | } |
| 2151 | |
Filipe Manana | 2000552 | 2014-08-29 13:35:13 +0100 | [diff] [blame] | 2152 | static bool steal_from_bitmap_to_end(struct btrfs_free_space_ctl *ctl, |
| 2153 | struct btrfs_free_space *info, |
| 2154 | bool update_stat) |
| 2155 | { |
| 2156 | struct btrfs_free_space *bitmap; |
| 2157 | unsigned long i; |
| 2158 | unsigned long j; |
| 2159 | const u64 end = info->offset + info->bytes; |
| 2160 | const u64 bitmap_offset = offset_to_bitmap(ctl, end); |
| 2161 | u64 bytes; |
| 2162 | |
| 2163 | bitmap = tree_search_offset(ctl, bitmap_offset, 1, 0); |
| 2164 | if (!bitmap) |
| 2165 | return false; |
| 2166 | |
| 2167 | i = offset_to_bit(bitmap->offset, ctl->unit, end); |
| 2168 | j = find_next_zero_bit(bitmap->bitmap, BITS_PER_BITMAP, i); |
| 2169 | if (j == i) |
| 2170 | return false; |
| 2171 | bytes = (j - i) * ctl->unit; |
| 2172 | info->bytes += bytes; |
| 2173 | |
| 2174 | if (update_stat) |
| 2175 | bitmap_clear_bits(ctl, bitmap, end, bytes); |
| 2176 | else |
| 2177 | __bitmap_clear_bits(ctl, bitmap, end, bytes); |
| 2178 | |
| 2179 | if (!bitmap->bytes) |
| 2180 | free_bitmap(ctl, bitmap); |
| 2181 | |
| 2182 | return true; |
| 2183 | } |
| 2184 | |
| 2185 | static bool steal_from_bitmap_to_front(struct btrfs_free_space_ctl *ctl, |
| 2186 | struct btrfs_free_space *info, |
| 2187 | bool update_stat) |
| 2188 | { |
| 2189 | struct btrfs_free_space *bitmap; |
| 2190 | u64 bitmap_offset; |
| 2191 | unsigned long i; |
| 2192 | unsigned long j; |
| 2193 | unsigned long prev_j; |
| 2194 | u64 bytes; |
| 2195 | |
| 2196 | bitmap_offset = offset_to_bitmap(ctl, info->offset); |
| 2197 | /* If we're on a boundary, try the previous logical bitmap. */ |
| 2198 | if (bitmap_offset == info->offset) { |
| 2199 | if (info->offset == 0) |
| 2200 | return false; |
| 2201 | bitmap_offset = offset_to_bitmap(ctl, info->offset - 1); |
| 2202 | } |
| 2203 | |
| 2204 | bitmap = tree_search_offset(ctl, bitmap_offset, 1, 0); |
| 2205 | if (!bitmap) |
| 2206 | return false; |
| 2207 | |
| 2208 | i = offset_to_bit(bitmap->offset, ctl->unit, info->offset) - 1; |
| 2209 | j = 0; |
| 2210 | prev_j = (unsigned long)-1; |
| 2211 | for_each_clear_bit_from(j, bitmap->bitmap, BITS_PER_BITMAP) { |
| 2212 | if (j > i) |
| 2213 | break; |
| 2214 | prev_j = j; |
| 2215 | } |
| 2216 | if (prev_j == i) |
| 2217 | return false; |
| 2218 | |
| 2219 | if (prev_j == (unsigned long)-1) |
| 2220 | bytes = (i + 1) * ctl->unit; |
| 2221 | else |
| 2222 | bytes = (i - prev_j) * ctl->unit; |
| 2223 | |
| 2224 | info->offset -= bytes; |
| 2225 | info->bytes += bytes; |
| 2226 | |
| 2227 | if (update_stat) |
| 2228 | bitmap_clear_bits(ctl, bitmap, info->offset, bytes); |
| 2229 | else |
| 2230 | __bitmap_clear_bits(ctl, bitmap, info->offset, bytes); |
| 2231 | |
| 2232 | if (!bitmap->bytes) |
| 2233 | free_bitmap(ctl, bitmap); |
| 2234 | |
| 2235 | return true; |
| 2236 | } |
| 2237 | |
| 2238 | /* |
| 2239 | * We prefer always to allocate from extent entries, both for clustered and |
| 2240 | * non-clustered allocation requests. So when attempting to add a new extent |
| 2241 | * entry, try to see if there's adjacent free space in bitmap entries, and if |
| 2242 | * there is, migrate that space from the bitmaps to the extent. |
| 2243 | * Like this we get better chances of satisfying space allocation requests |
| 2244 | * because we attempt to satisfy them based on a single cache entry, and never |
| 2245 | * on 2 or more entries - even if the entries represent a contiguous free space |
| 2246 | * region (e.g. 1 extent entry + 1 bitmap entry starting where the extent entry |
| 2247 | * ends). |
| 2248 | */ |
| 2249 | static void steal_from_bitmap(struct btrfs_free_space_ctl *ctl, |
| 2250 | struct btrfs_free_space *info, |
| 2251 | bool update_stat) |
| 2252 | { |
| 2253 | /* |
| 2254 | * Only work with disconnected entries, as we can change their offset, |
| 2255 | * and must be extent entries. |
| 2256 | */ |
| 2257 | ASSERT(!info->bitmap); |
| 2258 | ASSERT(RB_EMPTY_NODE(&info->offset_index)); |
| 2259 | |
| 2260 | if (ctl->total_bitmaps > 0) { |
| 2261 | bool stole_end; |
| 2262 | bool stole_front = false; |
| 2263 | |
| 2264 | stole_end = steal_from_bitmap_to_end(ctl, info, update_stat); |
| 2265 | if (ctl->total_bitmaps > 0) |
| 2266 | stole_front = steal_from_bitmap_to_front(ctl, info, |
| 2267 | update_stat); |
| 2268 | |
| 2269 | if (stole_end || stole_front) |
| 2270 | try_merge_free_space(ctl, info, update_stat); |
| 2271 | } |
| 2272 | } |
| 2273 | |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 2274 | int __btrfs_add_free_space(struct btrfs_free_space_ctl *ctl, |
| 2275 | u64 offset, u64 bytes) |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 2276 | { |
| 2277 | struct btrfs_free_space *info; |
| 2278 | int ret = 0; |
| 2279 | |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 2280 | info = kmem_cache_zalloc(btrfs_free_space_cachep, GFP_NOFS); |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 2281 | if (!info) |
| 2282 | return -ENOMEM; |
| 2283 | |
| 2284 | info->offset = offset; |
| 2285 | info->bytes = bytes; |
Filipe Manana | 2000552 | 2014-08-29 13:35:13 +0100 | [diff] [blame] | 2286 | RB_CLEAR_NODE(&info->offset_index); |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 2287 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2288 | spin_lock(&ctl->tree_lock); |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 2289 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2290 | if (try_merge_free_space(ctl, info, true)) |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 2291 | goto link; |
| 2292 | |
| 2293 | /* |
| 2294 | * There was no extent directly to the left or right of this new |
| 2295 | * extent then we know we're going to have to allocate a new extent, so |
| 2296 | * before we do that see if we need to drop this into a bitmap |
| 2297 | */ |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2298 | ret = insert_into_bitmap(ctl, info); |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 2299 | if (ret < 0) { |
| 2300 | goto out; |
| 2301 | } else if (ret) { |
| 2302 | ret = 0; |
| 2303 | goto out; |
| 2304 | } |
| 2305 | link: |
Filipe Manana | 2000552 | 2014-08-29 13:35:13 +0100 | [diff] [blame] | 2306 | /* |
| 2307 | * Only steal free space from adjacent bitmaps if we're sure we're not |
| 2308 | * going to add the new free space to existing bitmap entries - because |
| 2309 | * that would mean unnecessary work that would be reverted. Therefore |
| 2310 | * attempt to steal space from bitmaps if we're adding an extent entry. |
| 2311 | */ |
| 2312 | steal_from_bitmap(ctl, info, true); |
| 2313 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2314 | ret = link_free_space(ctl, info); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2315 | if (ret) |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 2316 | kmem_cache_free(btrfs_free_space_cachep, info); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2317 | out: |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2318 | spin_unlock(&ctl->tree_lock); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2319 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2320 | if (ret) { |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 2321 | printk(KERN_CRIT "BTRFS: unable to add free space :%d\n", ret); |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 2322 | ASSERT(ret != -EEXIST); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2323 | } |
| 2324 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2325 | return ret; |
| 2326 | } |
| 2327 | |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2328 | int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group, |
| 2329 | u64 offset, u64 bytes) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2330 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2331 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2332 | struct btrfs_free_space *info; |
Josef Bacik | b017511 | 2012-12-18 11:39:19 -0500 | [diff] [blame] | 2333 | int ret; |
| 2334 | bool re_search = false; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2335 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2336 | spin_lock(&ctl->tree_lock); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2337 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2338 | again: |
Josef Bacik | b017511 | 2012-12-18 11:39:19 -0500 | [diff] [blame] | 2339 | ret = 0; |
Josef Bacik | bdb7d30 | 2012-06-27 15:10:56 -0400 | [diff] [blame] | 2340 | if (!bytes) |
| 2341 | goto out_lock; |
| 2342 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2343 | info = tree_search_offset(ctl, offset, 0, 0); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2344 | if (!info) { |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 2345 | /* |
| 2346 | * oops didn't find an extent that matched the space we wanted |
| 2347 | * to remove, look for a bitmap instead |
| 2348 | */ |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2349 | info = tree_search_offset(ctl, offset_to_bitmap(ctl, offset), |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 2350 | 1, 0); |
| 2351 | if (!info) { |
Josef Bacik | b017511 | 2012-12-18 11:39:19 -0500 | [diff] [blame] | 2352 | /* |
| 2353 | * If we found a partial bit of our free space in a |
| 2354 | * bitmap but then couldn't find the other part this may |
| 2355 | * be a problem, so WARN about it. |
Chris Mason | 24a7031 | 2011-11-21 09:39:11 -0500 | [diff] [blame] | 2356 | */ |
Josef Bacik | b017511 | 2012-12-18 11:39:19 -0500 | [diff] [blame] | 2357 | WARN_ON(re_search); |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 2358 | goto out_lock; |
| 2359 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2360 | } |
| 2361 | |
Josef Bacik | b017511 | 2012-12-18 11:39:19 -0500 | [diff] [blame] | 2362 | re_search = false; |
Josef Bacik | bdb7d30 | 2012-06-27 15:10:56 -0400 | [diff] [blame] | 2363 | if (!info->bitmap) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2364 | unlink_free_space(ctl, info); |
Josef Bacik | bdb7d30 | 2012-06-27 15:10:56 -0400 | [diff] [blame] | 2365 | if (offset == info->offset) { |
| 2366 | u64 to_free = min(bytes, info->bytes); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2367 | |
Josef Bacik | bdb7d30 | 2012-06-27 15:10:56 -0400 | [diff] [blame] | 2368 | info->bytes -= to_free; |
| 2369 | info->offset += to_free; |
| 2370 | if (info->bytes) { |
| 2371 | ret = link_free_space(ctl, info); |
| 2372 | WARN_ON(ret); |
| 2373 | } else { |
| 2374 | kmem_cache_free(btrfs_free_space_cachep, info); |
| 2375 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2376 | |
Josef Bacik | bdb7d30 | 2012-06-27 15:10:56 -0400 | [diff] [blame] | 2377 | offset += to_free; |
| 2378 | bytes -= to_free; |
| 2379 | goto again; |
| 2380 | } else { |
| 2381 | u64 old_end = info->bytes + info->offset; |
Chris Mason | 9b49c9b | 2008-09-24 11:23:25 -0400 | [diff] [blame] | 2382 | |
Josef Bacik | bdb7d30 | 2012-06-27 15:10:56 -0400 | [diff] [blame] | 2383 | info->bytes = offset - info->offset; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2384 | ret = link_free_space(ctl, info); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2385 | WARN_ON(ret); |
| 2386 | if (ret) |
| 2387 | goto out_lock; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2388 | |
Josef Bacik | bdb7d30 | 2012-06-27 15:10:56 -0400 | [diff] [blame] | 2389 | /* Not enough bytes in this entry to satisfy us */ |
| 2390 | if (old_end < offset + bytes) { |
| 2391 | bytes -= old_end - offset; |
| 2392 | offset = old_end; |
| 2393 | goto again; |
| 2394 | } else if (old_end == offset + bytes) { |
| 2395 | /* all done */ |
| 2396 | goto out_lock; |
| 2397 | } |
| 2398 | spin_unlock(&ctl->tree_lock); |
| 2399 | |
| 2400 | ret = btrfs_add_free_space(block_group, offset + bytes, |
| 2401 | old_end - (offset + bytes)); |
| 2402 | WARN_ON(ret); |
| 2403 | goto out; |
| 2404 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2405 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2406 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2407 | ret = remove_from_bitmap(ctl, info, &offset, &bytes); |
Josef Bacik | b017511 | 2012-12-18 11:39:19 -0500 | [diff] [blame] | 2408 | if (ret == -EAGAIN) { |
| 2409 | re_search = true; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2410 | goto again; |
Josef Bacik | b017511 | 2012-12-18 11:39:19 -0500 | [diff] [blame] | 2411 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2412 | out_lock: |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2413 | spin_unlock(&ctl->tree_lock); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2414 | out: |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 2415 | return ret; |
| 2416 | } |
| 2417 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2418 | void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group, |
| 2419 | u64 bytes) |
| 2420 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2421 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2422 | struct btrfs_free_space *info; |
| 2423 | struct rb_node *n; |
| 2424 | int count = 0; |
| 2425 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2426 | for (n = rb_first(&ctl->free_space_offset); n; n = rb_next(n)) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2427 | info = rb_entry(n, struct btrfs_free_space, offset_index); |
Liu Bo | f6175ef | 2012-07-06 03:31:36 -0600 | [diff] [blame] | 2428 | if (info->bytes >= bytes && !block_group->ro) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2429 | count++; |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 2430 | btrfs_crit(block_group->fs_info, |
| 2431 | "entry offset %llu, bytes %llu, bitmap %s", |
| 2432 | info->offset, info->bytes, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2433 | (info->bitmap) ? "yes" : "no"); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2434 | } |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 2435 | btrfs_info(block_group->fs_info, "block group has cluster?: %s", |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2436 | list_empty(&block_group->cluster_list) ? "no" : "yes"); |
Frank Holton | efe120a | 2013-12-20 11:37:06 -0500 | [diff] [blame] | 2437 | btrfs_info(block_group->fs_info, |
| 2438 | "%d blocks of free space at or bigger than bytes is", count); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2439 | } |
| 2440 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2441 | void btrfs_init_free_space_ctl(struct btrfs_block_group_cache *block_group) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2442 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2443 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2444 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2445 | spin_lock_init(&ctl->tree_lock); |
| 2446 | ctl->unit = block_group->sectorsize; |
| 2447 | ctl->start = block_group->key.objectid; |
| 2448 | ctl->private = block_group; |
| 2449 | ctl->op = &free_space_op; |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 2450 | INIT_LIST_HEAD(&ctl->trimming_ranges); |
| 2451 | mutex_init(&ctl->cache_writeout_mutex); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2452 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2453 | /* |
| 2454 | * we only want to have 32k of ram per block group for keeping |
| 2455 | * track of free space, and if we pass 1/2 of that we want to |
| 2456 | * start converting things over to using bitmaps |
| 2457 | */ |
| 2458 | ctl->extents_thresh = ((1024 * 32) / 2) / |
| 2459 | sizeof(struct btrfs_free_space); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2460 | } |
| 2461 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2462 | /* |
| 2463 | * for a given cluster, put all of its extents back into the free |
| 2464 | * space cache. If the block group passed doesn't match the block group |
| 2465 | * pointed to by the cluster, someone else raced in and freed the |
| 2466 | * cluster already. In that case, we just return without changing anything |
| 2467 | */ |
| 2468 | static int |
| 2469 | __btrfs_return_cluster_to_free_space( |
| 2470 | struct btrfs_block_group_cache *block_group, |
| 2471 | struct btrfs_free_cluster *cluster) |
| 2472 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2473 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2474 | struct btrfs_free_space *entry; |
| 2475 | struct rb_node *node; |
| 2476 | |
| 2477 | spin_lock(&cluster->lock); |
| 2478 | if (cluster->block_group != block_group) |
| 2479 | goto out; |
| 2480 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2481 | cluster->block_group = NULL; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2482 | cluster->window_start = 0; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2483 | list_del_init(&cluster->block_group_list); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2484 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2485 | node = rb_first(&cluster->root); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2486 | while (node) { |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2487 | bool bitmap; |
| 2488 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2489 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
| 2490 | node = rb_next(&entry->offset_index); |
| 2491 | rb_erase(&entry->offset_index, &cluster->root); |
Filipe Manana | 2000552 | 2014-08-29 13:35:13 +0100 | [diff] [blame] | 2492 | RB_CLEAR_NODE(&entry->offset_index); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2493 | |
| 2494 | bitmap = (entry->bitmap != NULL); |
Filipe Manana | 2000552 | 2014-08-29 13:35:13 +0100 | [diff] [blame] | 2495 | if (!bitmap) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2496 | try_merge_free_space(ctl, entry, false); |
Filipe Manana | 2000552 | 2014-08-29 13:35:13 +0100 | [diff] [blame] | 2497 | steal_from_bitmap(ctl, entry, false); |
| 2498 | } |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2499 | tree_insert_offset(&ctl->free_space_offset, |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2500 | entry->offset, &entry->offset_index, bitmap); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2501 | } |
Eric Paris | 6bef4d3 | 2010-02-23 19:43:04 +0000 | [diff] [blame] | 2502 | cluster->root = RB_ROOT; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2503 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2504 | out: |
| 2505 | spin_unlock(&cluster->lock); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2506 | btrfs_put_block_group(block_group); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2507 | return 0; |
| 2508 | } |
| 2509 | |
Eric Sandeen | 48a3b63 | 2013-04-25 20:41:01 +0000 | [diff] [blame] | 2510 | static void __btrfs_remove_free_space_cache_locked( |
| 2511 | struct btrfs_free_space_ctl *ctl) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2512 | { |
| 2513 | struct btrfs_free_space *info; |
| 2514 | struct rb_node *node; |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 2515 | |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 2516 | while ((node = rb_last(&ctl->free_space_offset)) != NULL) { |
| 2517 | info = rb_entry(node, struct btrfs_free_space, offset_index); |
Josef Bacik | 9b90f51 | 2011-06-24 16:02:51 +0000 | [diff] [blame] | 2518 | if (!info->bitmap) { |
| 2519 | unlink_free_space(ctl, info); |
| 2520 | kmem_cache_free(btrfs_free_space_cachep, info); |
| 2521 | } else { |
| 2522 | free_bitmap(ctl, info); |
| 2523 | } |
David Sterba | 351810c | 2015-01-08 15:20:54 +0100 | [diff] [blame] | 2524 | |
| 2525 | cond_resched_lock(&ctl->tree_lock); |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 2526 | } |
Chris Mason | 0965537 | 2011-05-21 09:27:38 -0400 | [diff] [blame] | 2527 | } |
| 2528 | |
| 2529 | void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl) |
| 2530 | { |
| 2531 | spin_lock(&ctl->tree_lock); |
| 2532 | __btrfs_remove_free_space_cache_locked(ctl); |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 2533 | spin_unlock(&ctl->tree_lock); |
| 2534 | } |
| 2535 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2536 | void btrfs_remove_free_space_cache(struct btrfs_block_group_cache *block_group) |
| 2537 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2538 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2539 | struct btrfs_free_cluster *cluster; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2540 | struct list_head *head; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2541 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2542 | spin_lock(&ctl->tree_lock); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2543 | while ((head = block_group->cluster_list.next) != |
| 2544 | &block_group->cluster_list) { |
| 2545 | cluster = list_entry(head, struct btrfs_free_cluster, |
| 2546 | block_group_list); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2547 | |
| 2548 | WARN_ON(cluster->block_group != block_group); |
| 2549 | __btrfs_return_cluster_to_free_space(block_group, cluster); |
David Sterba | 351810c | 2015-01-08 15:20:54 +0100 | [diff] [blame] | 2550 | |
| 2551 | cond_resched_lock(&ctl->tree_lock); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2552 | } |
Chris Mason | 0965537 | 2011-05-21 09:27:38 -0400 | [diff] [blame] | 2553 | __btrfs_remove_free_space_cache_locked(ctl); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2554 | spin_unlock(&ctl->tree_lock); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2555 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2556 | } |
| 2557 | |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2558 | u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group, |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 2559 | u64 offset, u64 bytes, u64 empty_size, |
| 2560 | u64 *max_extent_size) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2561 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2562 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2563 | struct btrfs_free_space *entry = NULL; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2564 | u64 bytes_search = bytes + empty_size; |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2565 | u64 ret = 0; |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 2566 | u64 align_gap = 0; |
| 2567 | u64 align_gap_len = 0; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2568 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2569 | spin_lock(&ctl->tree_lock); |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 2570 | entry = find_free_space(ctl, &offset, &bytes_search, |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 2571 | block_group->full_stripe_len, max_extent_size); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2572 | if (!entry) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2573 | goto out; |
| 2574 | |
| 2575 | ret = offset; |
| 2576 | if (entry->bitmap) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2577 | bitmap_clear_bits(ctl, entry, offset, bytes); |
Li Zefan | edf6e2d | 2010-11-09 14:50:07 +0800 | [diff] [blame] | 2578 | if (!entry->bytes) |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2579 | free_bitmap(ctl, entry); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2580 | } else { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2581 | unlink_free_space(ctl, entry); |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 2582 | align_gap_len = offset - entry->offset; |
| 2583 | align_gap = entry->offset; |
| 2584 | |
| 2585 | entry->offset = offset + bytes; |
| 2586 | WARN_ON(entry->bytes < bytes + align_gap_len); |
| 2587 | |
| 2588 | entry->bytes -= bytes + align_gap_len; |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2589 | if (!entry->bytes) |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 2590 | kmem_cache_free(btrfs_free_space_cachep, entry); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2591 | else |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2592 | link_free_space(ctl, entry); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2593 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2594 | out: |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2595 | spin_unlock(&ctl->tree_lock); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2596 | |
David Woodhouse | 53b381b | 2013-01-29 18:40:14 -0500 | [diff] [blame] | 2597 | if (align_gap_len) |
| 2598 | __btrfs_add_free_space(ctl, align_gap, align_gap_len); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2599 | return ret; |
| 2600 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2601 | |
| 2602 | /* |
| 2603 | * given a cluster, put all of its extents back into the free space |
| 2604 | * cache. If a block group is passed, this function will only free |
| 2605 | * a cluster that belongs to the passed block group. |
| 2606 | * |
| 2607 | * Otherwise, it'll get a reference on the block group pointed to by the |
| 2608 | * cluster and remove the cluster from it. |
| 2609 | */ |
| 2610 | int btrfs_return_cluster_to_free_space( |
| 2611 | struct btrfs_block_group_cache *block_group, |
| 2612 | struct btrfs_free_cluster *cluster) |
| 2613 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2614 | struct btrfs_free_space_ctl *ctl; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2615 | int ret; |
| 2616 | |
| 2617 | /* first, get a safe pointer to the block group */ |
| 2618 | spin_lock(&cluster->lock); |
| 2619 | if (!block_group) { |
| 2620 | block_group = cluster->block_group; |
| 2621 | if (!block_group) { |
| 2622 | spin_unlock(&cluster->lock); |
| 2623 | return 0; |
| 2624 | } |
| 2625 | } else if (cluster->block_group != block_group) { |
| 2626 | /* someone else has already freed it don't redo their work */ |
| 2627 | spin_unlock(&cluster->lock); |
| 2628 | return 0; |
| 2629 | } |
| 2630 | atomic_inc(&block_group->count); |
| 2631 | spin_unlock(&cluster->lock); |
| 2632 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2633 | ctl = block_group->free_space_ctl; |
| 2634 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2635 | /* now return any extents the cluster had on it */ |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2636 | spin_lock(&ctl->tree_lock); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2637 | ret = __btrfs_return_cluster_to_free_space(block_group, cluster); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2638 | spin_unlock(&ctl->tree_lock); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2639 | |
| 2640 | /* finally drop our ref */ |
| 2641 | btrfs_put_block_group(block_group); |
| 2642 | return ret; |
| 2643 | } |
| 2644 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2645 | static u64 btrfs_alloc_from_bitmap(struct btrfs_block_group_cache *block_group, |
| 2646 | struct btrfs_free_cluster *cluster, |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2647 | struct btrfs_free_space *entry, |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 2648 | u64 bytes, u64 min_start, |
| 2649 | u64 *max_extent_size) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2650 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2651 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2652 | int err; |
| 2653 | u64 search_start = cluster->window_start; |
| 2654 | u64 search_bytes = bytes; |
| 2655 | u64 ret = 0; |
| 2656 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2657 | search_start = min_start; |
| 2658 | search_bytes = bytes; |
| 2659 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2660 | err = search_bitmap(ctl, entry, &search_start, &search_bytes); |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 2661 | if (err) { |
| 2662 | if (search_bytes > *max_extent_size) |
| 2663 | *max_extent_size = search_bytes; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2664 | return 0; |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 2665 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2666 | |
| 2667 | ret = search_start; |
Miao Xie | bb3ac5a | 2011-08-05 09:32:35 +0000 | [diff] [blame] | 2668 | __bitmap_clear_bits(ctl, entry, ret, bytes); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2669 | |
| 2670 | return ret; |
| 2671 | } |
| 2672 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2673 | /* |
| 2674 | * given a cluster, try to allocate 'bytes' from it, returns 0 |
| 2675 | * if it couldn't find anything suitably large, or a logical disk offset |
| 2676 | * if things worked out |
| 2677 | */ |
| 2678 | u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group, |
| 2679 | struct btrfs_free_cluster *cluster, u64 bytes, |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 2680 | u64 min_start, u64 *max_extent_size) |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2681 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2682 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2683 | struct btrfs_free_space *entry = NULL; |
| 2684 | struct rb_node *node; |
| 2685 | u64 ret = 0; |
| 2686 | |
| 2687 | spin_lock(&cluster->lock); |
| 2688 | if (bytes > cluster->max_size) |
| 2689 | goto out; |
| 2690 | |
| 2691 | if (cluster->block_group != block_group) |
| 2692 | goto out; |
| 2693 | |
| 2694 | node = rb_first(&cluster->root); |
| 2695 | if (!node) |
| 2696 | goto out; |
| 2697 | |
| 2698 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
Dulshani Gunawardhana | 6787125 | 2013-10-31 10:33:04 +0530 | [diff] [blame] | 2699 | while (1) { |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 2700 | if (entry->bytes < bytes && entry->bytes > *max_extent_size) |
| 2701 | *max_extent_size = entry->bytes; |
| 2702 | |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2703 | if (entry->bytes < bytes || |
| 2704 | (!entry->bitmap && entry->offset < min_start)) { |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2705 | node = rb_next(&entry->offset_index); |
| 2706 | if (!node) |
| 2707 | break; |
| 2708 | entry = rb_entry(node, struct btrfs_free_space, |
| 2709 | offset_index); |
| 2710 | continue; |
| 2711 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2712 | |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2713 | if (entry->bitmap) { |
| 2714 | ret = btrfs_alloc_from_bitmap(block_group, |
| 2715 | cluster, entry, bytes, |
Miao Xie | a482039 | 2013-09-09 13:19:42 +0800 | [diff] [blame] | 2716 | cluster->window_start, |
| 2717 | max_extent_size); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2718 | if (ret == 0) { |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2719 | node = rb_next(&entry->offset_index); |
| 2720 | if (!node) |
| 2721 | break; |
| 2722 | entry = rb_entry(node, struct btrfs_free_space, |
| 2723 | offset_index); |
| 2724 | continue; |
| 2725 | } |
Josef Bacik | 9b23062 | 2012-01-26 15:01:12 -0500 | [diff] [blame] | 2726 | cluster->window_start += bytes; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2727 | } else { |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2728 | ret = entry->offset; |
| 2729 | |
| 2730 | entry->offset += bytes; |
| 2731 | entry->bytes -= bytes; |
| 2732 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2733 | |
Li Zefan | 5e71b5d | 2010-11-09 14:55:34 +0800 | [diff] [blame] | 2734 | if (entry->bytes == 0) |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2735 | rb_erase(&entry->offset_index, &cluster->root); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2736 | break; |
| 2737 | } |
| 2738 | out: |
| 2739 | spin_unlock(&cluster->lock); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2740 | |
Li Zefan | 5e71b5d | 2010-11-09 14:55:34 +0800 | [diff] [blame] | 2741 | if (!ret) |
| 2742 | return 0; |
| 2743 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2744 | spin_lock(&ctl->tree_lock); |
Li Zefan | 5e71b5d | 2010-11-09 14:55:34 +0800 | [diff] [blame] | 2745 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2746 | ctl->free_space -= bytes; |
Li Zefan | 5e71b5d | 2010-11-09 14:55:34 +0800 | [diff] [blame] | 2747 | if (entry->bytes == 0) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2748 | ctl->free_extents--; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2749 | if (entry->bitmap) { |
| 2750 | kfree(entry->bitmap); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2751 | ctl->total_bitmaps--; |
| 2752 | ctl->op->recalc_thresholds(ctl); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2753 | } |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 2754 | kmem_cache_free(btrfs_free_space_cachep, entry); |
Li Zefan | 5e71b5d | 2010-11-09 14:55:34 +0800 | [diff] [blame] | 2755 | } |
| 2756 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2757 | spin_unlock(&ctl->tree_lock); |
Li Zefan | 5e71b5d | 2010-11-09 14:55:34 +0800 | [diff] [blame] | 2758 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2759 | return ret; |
| 2760 | } |
| 2761 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2762 | static int btrfs_bitmap_cluster(struct btrfs_block_group_cache *block_group, |
| 2763 | struct btrfs_free_space *entry, |
| 2764 | struct btrfs_free_cluster *cluster, |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2765 | u64 offset, u64 bytes, |
| 2766 | u64 cont1_bytes, u64 min_bytes) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2767 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2768 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2769 | unsigned long next_zero; |
| 2770 | unsigned long i; |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2771 | unsigned long want_bits; |
| 2772 | unsigned long min_bits; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2773 | unsigned long found_bits; |
| 2774 | unsigned long start = 0; |
| 2775 | unsigned long total_found = 0; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2776 | int ret; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2777 | |
Wang Sheng-Hui | 9600976 | 2012-11-30 06:30:14 +0000 | [diff] [blame] | 2778 | i = offset_to_bit(entry->offset, ctl->unit, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2779 | max_t(u64, offset, entry->offset)); |
Wang Sheng-Hui | 9600976 | 2012-11-30 06:30:14 +0000 | [diff] [blame] | 2780 | want_bits = bytes_to_bits(bytes, ctl->unit); |
| 2781 | min_bits = bytes_to_bits(min_bytes, ctl->unit); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2782 | |
| 2783 | again: |
| 2784 | found_bits = 0; |
Wei Yongjun | ebb3dad | 2012-09-13 20:29:02 -0600 | [diff] [blame] | 2785 | for_each_set_bit_from(i, entry->bitmap, BITS_PER_BITMAP) { |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2786 | next_zero = find_next_zero_bit(entry->bitmap, |
| 2787 | BITS_PER_BITMAP, i); |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2788 | if (next_zero - i >= min_bits) { |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2789 | found_bits = next_zero - i; |
| 2790 | break; |
| 2791 | } |
| 2792 | i = next_zero; |
| 2793 | } |
| 2794 | |
| 2795 | if (!found_bits) |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2796 | return -ENOSPC; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2797 | |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2798 | if (!total_found) { |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2799 | start = i; |
Alexandre Oliva | b78d09b | 2011-11-30 13:43:00 -0500 | [diff] [blame] | 2800 | cluster->max_size = 0; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2801 | } |
| 2802 | |
| 2803 | total_found += found_bits; |
| 2804 | |
Wang Sheng-Hui | 9600976 | 2012-11-30 06:30:14 +0000 | [diff] [blame] | 2805 | if (cluster->max_size < found_bits * ctl->unit) |
| 2806 | cluster->max_size = found_bits * ctl->unit; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2807 | |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2808 | if (total_found < want_bits || cluster->max_size < cont1_bytes) { |
| 2809 | i = next_zero + 1; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2810 | goto again; |
| 2811 | } |
| 2812 | |
Wang Sheng-Hui | 9600976 | 2012-11-30 06:30:14 +0000 | [diff] [blame] | 2813 | cluster->window_start = start * ctl->unit + entry->offset; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2814 | rb_erase(&entry->offset_index, &ctl->free_space_offset); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2815 | ret = tree_insert_offset(&cluster->root, entry->offset, |
| 2816 | &entry->offset_index, 1); |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 2817 | ASSERT(!ret); /* -EEXIST; Logic error */ |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2818 | |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 2819 | trace_btrfs_setup_cluster(block_group, cluster, |
Wang Sheng-Hui | 9600976 | 2012-11-30 06:30:14 +0000 | [diff] [blame] | 2820 | total_found * ctl->unit, 1); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2821 | return 0; |
| 2822 | } |
| 2823 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2824 | /* |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2825 | * This searches the block group for just extents to fill the cluster with. |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2826 | * Try to find a cluster with at least bytes total bytes, at least one |
| 2827 | * extent of cont1_bytes, and other clusters of at least min_bytes. |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2828 | */ |
Josef Bacik | 3de85bb | 2011-05-25 13:07:37 -0400 | [diff] [blame] | 2829 | static noinline int |
| 2830 | setup_cluster_no_bitmap(struct btrfs_block_group_cache *block_group, |
| 2831 | struct btrfs_free_cluster *cluster, |
| 2832 | struct list_head *bitmaps, u64 offset, u64 bytes, |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2833 | u64 cont1_bytes, u64 min_bytes) |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2834 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2835 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2836 | struct btrfs_free_space *first = NULL; |
| 2837 | struct btrfs_free_space *entry = NULL; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2838 | struct btrfs_free_space *last; |
| 2839 | struct rb_node *node; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2840 | u64 window_free; |
| 2841 | u64 max_extent; |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 2842 | u64 total_size = 0; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2843 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2844 | entry = tree_search_offset(ctl, offset, 0, 1); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2845 | if (!entry) |
| 2846 | return -ENOSPC; |
| 2847 | |
| 2848 | /* |
| 2849 | * We don't want bitmaps, so just move along until we find a normal |
| 2850 | * extent entry. |
| 2851 | */ |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2852 | while (entry->bitmap || entry->bytes < min_bytes) { |
| 2853 | if (entry->bitmap && list_empty(&entry->list)) |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2854 | list_add_tail(&entry->list, bitmaps); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2855 | node = rb_next(&entry->offset_index); |
| 2856 | if (!node) |
| 2857 | return -ENOSPC; |
| 2858 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
| 2859 | } |
| 2860 | |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2861 | window_free = entry->bytes; |
| 2862 | max_extent = entry->bytes; |
| 2863 | first = entry; |
| 2864 | last = entry; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2865 | |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2866 | for (node = rb_next(&entry->offset_index); node; |
| 2867 | node = rb_next(&entry->offset_index)) { |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2868 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
| 2869 | |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2870 | if (entry->bitmap) { |
| 2871 | if (list_empty(&entry->list)) |
| 2872 | list_add_tail(&entry->list, bitmaps); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2873 | continue; |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2874 | } |
| 2875 | |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2876 | if (entry->bytes < min_bytes) |
| 2877 | continue; |
| 2878 | |
| 2879 | last = entry; |
| 2880 | window_free += entry->bytes; |
| 2881 | if (entry->bytes > max_extent) |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2882 | max_extent = entry->bytes; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2883 | } |
| 2884 | |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2885 | if (window_free < bytes || max_extent < cont1_bytes) |
| 2886 | return -ENOSPC; |
| 2887 | |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2888 | cluster->window_start = first->offset; |
| 2889 | |
| 2890 | node = &first->offset_index; |
| 2891 | |
| 2892 | /* |
| 2893 | * now we've found our entries, pull them out of the free space |
| 2894 | * cache and put them into the cluster rbtree |
| 2895 | */ |
| 2896 | do { |
| 2897 | int ret; |
| 2898 | |
| 2899 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
| 2900 | node = rb_next(&entry->offset_index); |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2901 | if (entry->bitmap || entry->bytes < min_bytes) |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2902 | continue; |
| 2903 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2904 | rb_erase(&entry->offset_index, &ctl->free_space_offset); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2905 | ret = tree_insert_offset(&cluster->root, entry->offset, |
| 2906 | &entry->offset_index, 0); |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 2907 | total_size += entry->bytes; |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 2908 | ASSERT(!ret); /* -EEXIST; Logic error */ |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2909 | } while (node && entry != last); |
| 2910 | |
| 2911 | cluster->max_size = max_extent; |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 2912 | trace_btrfs_setup_cluster(block_group, cluster, total_size, 0); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2913 | return 0; |
| 2914 | } |
| 2915 | |
| 2916 | /* |
| 2917 | * This specifically looks for bitmaps that may work in the cluster, we assume |
| 2918 | * that we have already failed to find extents that will work. |
| 2919 | */ |
Josef Bacik | 3de85bb | 2011-05-25 13:07:37 -0400 | [diff] [blame] | 2920 | static noinline int |
| 2921 | setup_cluster_bitmap(struct btrfs_block_group_cache *block_group, |
| 2922 | struct btrfs_free_cluster *cluster, |
| 2923 | struct list_head *bitmaps, u64 offset, u64 bytes, |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2924 | u64 cont1_bytes, u64 min_bytes) |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2925 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2926 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2927 | struct btrfs_free_space *entry; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2928 | int ret = -ENOSPC; |
Li Zefan | 0f0fbf1 | 2011-11-20 07:33:38 -0500 | [diff] [blame] | 2929 | u64 bitmap_offset = offset_to_bitmap(ctl, offset); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2930 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2931 | if (ctl->total_bitmaps == 0) |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2932 | return -ENOSPC; |
| 2933 | |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2934 | /* |
Li Zefan | 0f0fbf1 | 2011-11-20 07:33:38 -0500 | [diff] [blame] | 2935 | * The bitmap that covers offset won't be in the list unless offset |
| 2936 | * is just its start offset. |
| 2937 | */ |
| 2938 | entry = list_first_entry(bitmaps, struct btrfs_free_space, list); |
| 2939 | if (entry->offset != bitmap_offset) { |
| 2940 | entry = tree_search_offset(ctl, bitmap_offset, 1, 0); |
| 2941 | if (entry && list_empty(&entry->list)) |
| 2942 | list_add(&entry->list, bitmaps); |
| 2943 | } |
| 2944 | |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2945 | list_for_each_entry(entry, bitmaps, list) { |
Josef Bacik | 357b978 | 2012-01-26 15:01:11 -0500 | [diff] [blame] | 2946 | if (entry->bytes < bytes) |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2947 | continue; |
| 2948 | ret = btrfs_bitmap_cluster(block_group, entry, cluster, offset, |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2949 | bytes, cont1_bytes, min_bytes); |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2950 | if (!ret) |
| 2951 | return 0; |
| 2952 | } |
| 2953 | |
| 2954 | /* |
Li Zefan | 52621cb | 2011-11-20 07:33:38 -0500 | [diff] [blame] | 2955 | * The bitmaps list has all the bitmaps that record free space |
| 2956 | * starting after offset, so no more search is required. |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2957 | */ |
Li Zefan | 52621cb | 2011-11-20 07:33:38 -0500 | [diff] [blame] | 2958 | return -ENOSPC; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2959 | } |
| 2960 | |
| 2961 | /* |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2962 | * here we try to find a cluster of blocks in a block group. The goal |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2963 | * is to find at least bytes+empty_size. |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2964 | * We might not find them all in one contiguous area. |
| 2965 | * |
| 2966 | * returns zero and sets up cluster if things worked out, otherwise |
| 2967 | * it returns -enospc |
| 2968 | */ |
Josef Bacik | 0036158 | 2013-08-14 14:02:47 -0400 | [diff] [blame] | 2969 | int btrfs_find_space_cluster(struct btrfs_root *root, |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2970 | struct btrfs_block_group_cache *block_group, |
| 2971 | struct btrfs_free_cluster *cluster, |
| 2972 | u64 offset, u64 bytes, u64 empty_size) |
| 2973 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2974 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2975 | struct btrfs_free_space *entry, *tmp; |
Li Zefan | 52621cb | 2011-11-20 07:33:38 -0500 | [diff] [blame] | 2976 | LIST_HEAD(bitmaps); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2977 | u64 min_bytes; |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2978 | u64 cont1_bytes; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2979 | int ret; |
| 2980 | |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2981 | /* |
| 2982 | * Choose the minimum extent size we'll require for this |
| 2983 | * cluster. For SSD_SPREAD, don't allow any fragmentation. |
| 2984 | * For metadata, allow allocates with smaller extents. For |
| 2985 | * data, keep it dense. |
| 2986 | */ |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 2987 | if (btrfs_test_opt(root, SSD_SPREAD)) { |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2988 | cont1_bytes = min_bytes = bytes + empty_size; |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 2989 | } else if (block_group->flags & BTRFS_BLOCK_GROUP_METADATA) { |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2990 | cont1_bytes = bytes; |
| 2991 | min_bytes = block_group->sectorsize; |
| 2992 | } else { |
| 2993 | cont1_bytes = max(bytes, (bytes + empty_size) >> 2); |
| 2994 | min_bytes = block_group->sectorsize; |
| 2995 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2996 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2997 | spin_lock(&ctl->tree_lock); |
Josef Bacik | 7d0d2e8 | 2011-03-18 15:13:42 -0400 | [diff] [blame] | 2998 | |
| 2999 | /* |
| 3000 | * If we know we don't have enough space to make a cluster don't even |
| 3001 | * bother doing all the work to try and find one. |
| 3002 | */ |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 3003 | if (ctl->free_space < bytes) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 3004 | spin_unlock(&ctl->tree_lock); |
Josef Bacik | 7d0d2e8 | 2011-03-18 15:13:42 -0400 | [diff] [blame] | 3005 | return -ENOSPC; |
| 3006 | } |
| 3007 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 3008 | spin_lock(&cluster->lock); |
| 3009 | |
| 3010 | /* someone already found a cluster, hooray */ |
| 3011 | if (cluster->block_group) { |
| 3012 | ret = 0; |
| 3013 | goto out; |
| 3014 | } |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 3015 | |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 3016 | trace_btrfs_find_cluster(block_group, offset, bytes, empty_size, |
| 3017 | min_bytes); |
| 3018 | |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 3019 | ret = setup_cluster_no_bitmap(block_group, cluster, &bitmaps, offset, |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 3020 | bytes + empty_size, |
| 3021 | cont1_bytes, min_bytes); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 3022 | if (ret) |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 3023 | ret = setup_cluster_bitmap(block_group, cluster, &bitmaps, |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 3024 | offset, bytes + empty_size, |
| 3025 | cont1_bytes, min_bytes); |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 3026 | |
| 3027 | /* Clear our temporary list */ |
| 3028 | list_for_each_entry_safe(entry, tmp, &bitmaps, list) |
| 3029 | list_del_init(&entry->list); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 3030 | |
| 3031 | if (!ret) { |
| 3032 | atomic_inc(&block_group->count); |
| 3033 | list_add_tail(&cluster->block_group_list, |
| 3034 | &block_group->cluster_list); |
| 3035 | cluster->block_group = block_group; |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 3036 | } else { |
| 3037 | trace_btrfs_failed_cluster_setup(block_group); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 3038 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 3039 | out: |
| 3040 | spin_unlock(&cluster->lock); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 3041 | spin_unlock(&ctl->tree_lock); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 3042 | |
| 3043 | return ret; |
| 3044 | } |
| 3045 | |
| 3046 | /* |
| 3047 | * simple code to zero out a cluster |
| 3048 | */ |
| 3049 | void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster) |
| 3050 | { |
| 3051 | spin_lock_init(&cluster->lock); |
| 3052 | spin_lock_init(&cluster->refill_lock); |
Eric Paris | 6bef4d3 | 2010-02-23 19:43:04 +0000 | [diff] [blame] | 3053 | cluster->root = RB_ROOT; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 3054 | cluster->max_size = 0; |
| 3055 | INIT_LIST_HEAD(&cluster->block_group_list); |
| 3056 | cluster->block_group = NULL; |
| 3057 | } |
| 3058 | |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3059 | static int do_trimming(struct btrfs_block_group_cache *block_group, |
| 3060 | u64 *total_trimmed, u64 start, u64 bytes, |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3061 | u64 reserved_start, u64 reserved_bytes, |
| 3062 | struct btrfs_trim_range *trim_entry) |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3063 | { |
| 3064 | struct btrfs_space_info *space_info = block_group->space_info; |
| 3065 | struct btrfs_fs_info *fs_info = block_group->fs_info; |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3066 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3067 | int ret; |
| 3068 | int update = 0; |
| 3069 | u64 trimmed = 0; |
| 3070 | |
| 3071 | spin_lock(&space_info->lock); |
| 3072 | spin_lock(&block_group->lock); |
| 3073 | if (!block_group->ro) { |
| 3074 | block_group->reserved += reserved_bytes; |
| 3075 | space_info->bytes_reserved += reserved_bytes; |
| 3076 | update = 1; |
| 3077 | } |
| 3078 | spin_unlock(&block_group->lock); |
| 3079 | spin_unlock(&space_info->lock); |
| 3080 | |
Filipe Manana | 1edb647b | 2014-12-08 14:01:12 +0000 | [diff] [blame] | 3081 | ret = btrfs_discard_extent(fs_info->extent_root, |
| 3082 | start, bytes, &trimmed); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3083 | if (!ret) |
| 3084 | *total_trimmed += trimmed; |
| 3085 | |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3086 | mutex_lock(&ctl->cache_writeout_mutex); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3087 | btrfs_add_free_space(block_group, reserved_start, reserved_bytes); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3088 | list_del(&trim_entry->list); |
| 3089 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3090 | |
| 3091 | if (update) { |
| 3092 | spin_lock(&space_info->lock); |
| 3093 | spin_lock(&block_group->lock); |
| 3094 | if (block_group->ro) |
| 3095 | space_info->bytes_readonly += reserved_bytes; |
| 3096 | block_group->reserved -= reserved_bytes; |
| 3097 | space_info->bytes_reserved -= reserved_bytes; |
| 3098 | spin_unlock(&space_info->lock); |
| 3099 | spin_unlock(&block_group->lock); |
| 3100 | } |
| 3101 | |
| 3102 | return ret; |
| 3103 | } |
| 3104 | |
| 3105 | static int trim_no_bitmap(struct btrfs_block_group_cache *block_group, |
| 3106 | u64 *total_trimmed, u64 start, u64 end, u64 minlen) |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 3107 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 3108 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3109 | struct btrfs_free_space *entry; |
| 3110 | struct rb_node *node; |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 3111 | int ret = 0; |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3112 | u64 extent_start; |
| 3113 | u64 extent_bytes; |
| 3114 | u64 bytes; |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 3115 | |
| 3116 | while (start < end) { |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3117 | struct btrfs_trim_range trim_entry; |
| 3118 | |
| 3119 | mutex_lock(&ctl->cache_writeout_mutex); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 3120 | spin_lock(&ctl->tree_lock); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 3121 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 3122 | if (ctl->free_space < minlen) { |
| 3123 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3124 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 3125 | break; |
| 3126 | } |
| 3127 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 3128 | entry = tree_search_offset(ctl, start, 0, 1); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3129 | if (!entry) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 3130 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3131 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 3132 | break; |
| 3133 | } |
| 3134 | |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3135 | /* skip bitmaps */ |
| 3136 | while (entry->bitmap) { |
| 3137 | node = rb_next(&entry->offset_index); |
| 3138 | if (!node) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 3139 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3140 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3141 | goto out; |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 3142 | } |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3143 | entry = rb_entry(node, struct btrfs_free_space, |
| 3144 | offset_index); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 3145 | } |
| 3146 | |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3147 | if (entry->offset >= end) { |
| 3148 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3149 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3150 | break; |
| 3151 | } |
| 3152 | |
| 3153 | extent_start = entry->offset; |
| 3154 | extent_bytes = entry->bytes; |
| 3155 | start = max(start, extent_start); |
| 3156 | bytes = min(extent_start + extent_bytes, end) - start; |
| 3157 | if (bytes < minlen) { |
| 3158 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3159 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3160 | goto next; |
| 3161 | } |
| 3162 | |
| 3163 | unlink_free_space(ctl, entry); |
| 3164 | kmem_cache_free(btrfs_free_space_cachep, entry); |
| 3165 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 3166 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3167 | trim_entry.start = extent_start; |
| 3168 | trim_entry.bytes = extent_bytes; |
| 3169 | list_add_tail(&trim_entry.list, &ctl->trimming_ranges); |
| 3170 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 3171 | |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3172 | ret = do_trimming(block_group, total_trimmed, start, bytes, |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3173 | extent_start, extent_bytes, &trim_entry); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3174 | if (ret) |
| 3175 | break; |
| 3176 | next: |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 3177 | start += bytes; |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 3178 | |
| 3179 | if (fatal_signal_pending(current)) { |
| 3180 | ret = -ERESTARTSYS; |
| 3181 | break; |
| 3182 | } |
| 3183 | |
| 3184 | cond_resched(); |
| 3185 | } |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3186 | out: |
| 3187 | return ret; |
| 3188 | } |
| 3189 | |
| 3190 | static int trim_bitmaps(struct btrfs_block_group_cache *block_group, |
| 3191 | u64 *total_trimmed, u64 start, u64 end, u64 minlen) |
| 3192 | { |
| 3193 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
| 3194 | struct btrfs_free_space *entry; |
| 3195 | int ret = 0; |
| 3196 | int ret2; |
| 3197 | u64 bytes; |
| 3198 | u64 offset = offset_to_bitmap(ctl, start); |
| 3199 | |
| 3200 | while (offset < end) { |
| 3201 | bool next_bitmap = false; |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3202 | struct btrfs_trim_range trim_entry; |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3203 | |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3204 | mutex_lock(&ctl->cache_writeout_mutex); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3205 | spin_lock(&ctl->tree_lock); |
| 3206 | |
| 3207 | if (ctl->free_space < minlen) { |
| 3208 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3209 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3210 | break; |
| 3211 | } |
| 3212 | |
| 3213 | entry = tree_search_offset(ctl, offset, 1, 0); |
| 3214 | if (!entry) { |
| 3215 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3216 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3217 | next_bitmap = true; |
| 3218 | goto next; |
| 3219 | } |
| 3220 | |
| 3221 | bytes = minlen; |
| 3222 | ret2 = search_bitmap(ctl, entry, &start, &bytes); |
| 3223 | if (ret2 || start >= end) { |
| 3224 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3225 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3226 | next_bitmap = true; |
| 3227 | goto next; |
| 3228 | } |
| 3229 | |
| 3230 | bytes = min(bytes, end - start); |
| 3231 | if (bytes < minlen) { |
| 3232 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3233 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3234 | goto next; |
| 3235 | } |
| 3236 | |
| 3237 | bitmap_clear_bits(ctl, entry, start, bytes); |
| 3238 | if (entry->bytes == 0) |
| 3239 | free_bitmap(ctl, entry); |
| 3240 | |
| 3241 | spin_unlock(&ctl->tree_lock); |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3242 | trim_entry.start = start; |
| 3243 | trim_entry.bytes = bytes; |
| 3244 | list_add_tail(&trim_entry.list, &ctl->trimming_ranges); |
| 3245 | mutex_unlock(&ctl->cache_writeout_mutex); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3246 | |
| 3247 | ret = do_trimming(block_group, total_trimmed, start, bytes, |
Filipe Manana | 55507ce | 2014-12-01 17:04:09 +0000 | [diff] [blame] | 3248 | start, bytes, &trim_entry); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3249 | if (ret) |
| 3250 | break; |
| 3251 | next: |
| 3252 | if (next_bitmap) { |
| 3253 | offset += BITS_PER_BITMAP * ctl->unit; |
| 3254 | } else { |
| 3255 | start += bytes; |
| 3256 | if (start >= offset + BITS_PER_BITMAP * ctl->unit) |
| 3257 | offset += BITS_PER_BITMAP * ctl->unit; |
| 3258 | } |
| 3259 | |
| 3260 | if (fatal_signal_pending(current)) { |
| 3261 | ret = -ERESTARTSYS; |
| 3262 | break; |
| 3263 | } |
| 3264 | |
| 3265 | cond_resched(); |
| 3266 | } |
| 3267 | |
| 3268 | return ret; |
| 3269 | } |
| 3270 | |
| 3271 | int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group, |
| 3272 | u64 *trimmed, u64 start, u64 end, u64 minlen) |
| 3273 | { |
| 3274 | int ret; |
| 3275 | |
| 3276 | *trimmed = 0; |
| 3277 | |
Filipe Manana | 0421682 | 2014-11-27 21:14:15 +0000 | [diff] [blame] | 3278 | spin_lock(&block_group->lock); |
| 3279 | if (block_group->removed) { |
| 3280 | spin_unlock(&block_group->lock); |
| 3281 | return 0; |
| 3282 | } |
| 3283 | atomic_inc(&block_group->trimming); |
| 3284 | spin_unlock(&block_group->lock); |
| 3285 | |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3286 | ret = trim_no_bitmap(block_group, trimmed, start, end, minlen); |
| 3287 | if (ret) |
Filipe Manana | 0421682 | 2014-11-27 21:14:15 +0000 | [diff] [blame] | 3288 | goto out; |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 3289 | |
| 3290 | ret = trim_bitmaps(block_group, trimmed, start, end, minlen); |
Filipe Manana | 0421682 | 2014-11-27 21:14:15 +0000 | [diff] [blame] | 3291 | out: |
| 3292 | spin_lock(&block_group->lock); |
| 3293 | if (atomic_dec_and_test(&block_group->trimming) && |
| 3294 | block_group->removed) { |
| 3295 | struct extent_map_tree *em_tree; |
| 3296 | struct extent_map *em; |
| 3297 | |
| 3298 | spin_unlock(&block_group->lock); |
| 3299 | |
Filipe Manana | a1e7e16 | 2014-12-04 15:31:01 +0000 | [diff] [blame] | 3300 | lock_chunks(block_group->fs_info->chunk_root); |
Filipe Manana | 0421682 | 2014-11-27 21:14:15 +0000 | [diff] [blame] | 3301 | em_tree = &block_group->fs_info->mapping_tree.map_tree; |
| 3302 | write_lock(&em_tree->lock); |
| 3303 | em = lookup_extent_mapping(em_tree, block_group->key.objectid, |
| 3304 | 1); |
| 3305 | BUG_ON(!em); /* logic error, can't happen */ |
Filipe Manana | a1e7e16 | 2014-12-04 15:31:01 +0000 | [diff] [blame] | 3306 | /* |
| 3307 | * remove_extent_mapping() will delete us from the pinned_chunks |
| 3308 | * list, which is protected by the chunk mutex. |
| 3309 | */ |
Filipe Manana | 0421682 | 2014-11-27 21:14:15 +0000 | [diff] [blame] | 3310 | remove_extent_mapping(em_tree, em); |
| 3311 | write_unlock(&em_tree->lock); |
Filipe Manana | 0421682 | 2014-11-27 21:14:15 +0000 | [diff] [blame] | 3312 | unlock_chunks(block_group->fs_info->chunk_root); |
| 3313 | |
| 3314 | /* once for us and once for the tree */ |
| 3315 | free_extent_map(em); |
| 3316 | free_extent_map(em); |
Filipe Manana | 946ddbe | 2014-12-01 17:04:40 +0000 | [diff] [blame] | 3317 | |
| 3318 | /* |
| 3319 | * We've left one free space entry and other tasks trimming |
| 3320 | * this block group have left 1 entry each one. Free them. |
| 3321 | */ |
| 3322 | __btrfs_remove_free_space_cache(block_group->free_space_ctl); |
Filipe Manana | 0421682 | 2014-11-27 21:14:15 +0000 | [diff] [blame] | 3323 | } else { |
| 3324 | spin_unlock(&block_group->lock); |
| 3325 | } |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 3326 | |
| 3327 | return ret; |
| 3328 | } |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 3329 | |
| 3330 | /* |
| 3331 | * Find the left-most item in the cache tree, and then return the |
| 3332 | * smallest inode number in the item. |
| 3333 | * |
| 3334 | * Note: the returned inode number may not be the smallest one in |
| 3335 | * the tree, if the left-most item is a bitmap. |
| 3336 | */ |
| 3337 | u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root) |
| 3338 | { |
| 3339 | struct btrfs_free_space_ctl *ctl = fs_root->free_ino_ctl; |
| 3340 | struct btrfs_free_space *entry = NULL; |
| 3341 | u64 ino = 0; |
| 3342 | |
| 3343 | spin_lock(&ctl->tree_lock); |
| 3344 | |
| 3345 | if (RB_EMPTY_ROOT(&ctl->free_space_offset)) |
| 3346 | goto out; |
| 3347 | |
| 3348 | entry = rb_entry(rb_first(&ctl->free_space_offset), |
| 3349 | struct btrfs_free_space, offset_index); |
| 3350 | |
| 3351 | if (!entry->bitmap) { |
| 3352 | ino = entry->offset; |
| 3353 | |
| 3354 | unlink_free_space(ctl, entry); |
| 3355 | entry->offset++; |
| 3356 | entry->bytes--; |
| 3357 | if (!entry->bytes) |
| 3358 | kmem_cache_free(btrfs_free_space_cachep, entry); |
| 3359 | else |
| 3360 | link_free_space(ctl, entry); |
| 3361 | } else { |
| 3362 | u64 offset = 0; |
| 3363 | u64 count = 1; |
| 3364 | int ret; |
| 3365 | |
| 3366 | ret = search_bitmap(ctl, entry, &offset, &count); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3367 | /* Logic error; Should be empty if it can't find anything */ |
Josef Bacik | b12d686 | 2013-08-26 17:14:08 -0400 | [diff] [blame] | 3368 | ASSERT(!ret); |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 3369 | |
| 3370 | ino = offset; |
| 3371 | bitmap_clear_bits(ctl, entry, offset, 1); |
| 3372 | if (entry->bytes == 0) |
| 3373 | free_bitmap(ctl, entry); |
| 3374 | } |
| 3375 | out: |
| 3376 | spin_unlock(&ctl->tree_lock); |
| 3377 | |
| 3378 | return ino; |
| 3379 | } |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3380 | |
| 3381 | struct inode *lookup_free_ino_inode(struct btrfs_root *root, |
| 3382 | struct btrfs_path *path) |
| 3383 | { |
| 3384 | struct inode *inode = NULL; |
| 3385 | |
David Sterba | 57cdc8d | 2014-02-05 02:37:48 +0100 | [diff] [blame] | 3386 | spin_lock(&root->ino_cache_lock); |
| 3387 | if (root->ino_cache_inode) |
| 3388 | inode = igrab(root->ino_cache_inode); |
| 3389 | spin_unlock(&root->ino_cache_lock); |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3390 | if (inode) |
| 3391 | return inode; |
| 3392 | |
| 3393 | inode = __lookup_free_space_inode(root, path, 0); |
| 3394 | if (IS_ERR(inode)) |
| 3395 | return inode; |
| 3396 | |
David Sterba | 57cdc8d | 2014-02-05 02:37:48 +0100 | [diff] [blame] | 3397 | spin_lock(&root->ino_cache_lock); |
David Sterba | 7841cb2 | 2011-05-31 18:07:27 +0200 | [diff] [blame] | 3398 | if (!btrfs_fs_closing(root->fs_info)) |
David Sterba | 57cdc8d | 2014-02-05 02:37:48 +0100 | [diff] [blame] | 3399 | root->ino_cache_inode = igrab(inode); |
| 3400 | spin_unlock(&root->ino_cache_lock); |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3401 | |
| 3402 | return inode; |
| 3403 | } |
| 3404 | |
| 3405 | int create_free_ino_inode(struct btrfs_root *root, |
| 3406 | struct btrfs_trans_handle *trans, |
| 3407 | struct btrfs_path *path) |
| 3408 | { |
| 3409 | return __create_free_space_inode(root, trans, path, |
| 3410 | BTRFS_FREE_INO_OBJECTID, 0); |
| 3411 | } |
| 3412 | |
| 3413 | int load_free_ino_cache(struct btrfs_fs_info *fs_info, struct btrfs_root *root) |
| 3414 | { |
| 3415 | struct btrfs_free_space_ctl *ctl = root->free_ino_ctl; |
| 3416 | struct btrfs_path *path; |
| 3417 | struct inode *inode; |
| 3418 | int ret = 0; |
| 3419 | u64 root_gen = btrfs_root_generation(&root->root_item); |
| 3420 | |
Chris Mason | 4b9465c | 2011-06-03 09:36:29 -0400 | [diff] [blame] | 3421 | if (!btrfs_test_opt(root, INODE_MAP_CACHE)) |
| 3422 | return 0; |
| 3423 | |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3424 | /* |
| 3425 | * If we're unmounting then just return, since this does a search on the |
| 3426 | * normal root and not the commit root and we could deadlock. |
| 3427 | */ |
David Sterba | 7841cb2 | 2011-05-31 18:07:27 +0200 | [diff] [blame] | 3428 | if (btrfs_fs_closing(fs_info)) |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3429 | return 0; |
| 3430 | |
| 3431 | path = btrfs_alloc_path(); |
| 3432 | if (!path) |
| 3433 | return 0; |
| 3434 | |
| 3435 | inode = lookup_free_ino_inode(root, path); |
| 3436 | if (IS_ERR(inode)) |
| 3437 | goto out; |
| 3438 | |
| 3439 | if (root_gen != BTRFS_I(inode)->generation) |
| 3440 | goto out_put; |
| 3441 | |
| 3442 | ret = __load_free_space_cache(root, inode, ctl, path, 0); |
| 3443 | |
| 3444 | if (ret < 0) |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 3445 | btrfs_err(fs_info, |
| 3446 | "failed to load free ino cache for root %llu", |
| 3447 | root->root_key.objectid); |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3448 | out_put: |
| 3449 | iput(inode); |
| 3450 | out: |
| 3451 | btrfs_free_path(path); |
| 3452 | return ret; |
| 3453 | } |
| 3454 | |
| 3455 | int btrfs_write_out_ino_cache(struct btrfs_root *root, |
| 3456 | struct btrfs_trans_handle *trans, |
Filipe David Borba Manana | 53645a9 | 2013-09-20 14:43:28 +0100 | [diff] [blame] | 3457 | struct btrfs_path *path, |
| 3458 | struct inode *inode) |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3459 | { |
| 3460 | struct btrfs_free_space_ctl *ctl = root->free_ino_ctl; |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3461 | int ret; |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 3462 | struct btrfs_io_ctl io_ctl; |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3463 | |
Chris Mason | 4b9465c | 2011-06-03 09:36:29 -0400 | [diff] [blame] | 3464 | if (!btrfs_test_opt(root, INODE_MAP_CACHE)) |
| 3465 | return 0; |
| 3466 | |
Chris Mason | 85db36c | 2015-04-23 08:02:49 -0700 | [diff] [blame^] | 3467 | memset(&io_ctl, 0, sizeof(io_ctl)); |
Chris Mason | c9dc4c6 | 2015-04-04 17:14:42 -0700 | [diff] [blame] | 3468 | ret = __btrfs_write_out_cache(root, inode, ctl, NULL, &io_ctl, |
Chris Mason | 85db36c | 2015-04-23 08:02:49 -0700 | [diff] [blame^] | 3469 | trans, path, 0); |
| 3470 | if (!ret) |
| 3471 | ret = btrfs_wait_cache_io(root, trans, NULL, &io_ctl, path, 0); |
| 3472 | |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 3473 | if (ret) { |
| 3474 | btrfs_delalloc_release_metadata(inode, inode->i_size); |
| 3475 | #ifdef DEBUG |
Simon Kirby | c2cf52e | 2013-03-19 22:41:23 +0000 | [diff] [blame] | 3476 | btrfs_err(root->fs_info, |
| 3477 | "failed to write free ino cache for root %llu", |
| 3478 | root->root_key.objectid); |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 3479 | #endif |
| 3480 | } |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3481 | |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3482 | return ret; |
| 3483 | } |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 3484 | |
| 3485 | #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
Josef Bacik | dc11dd5d | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 3486 | /* |
| 3487 | * Use this if you need to make a bitmap or extent entry specifically, it |
| 3488 | * doesn't do any of the merging that add_free_space does, this acts a lot like |
| 3489 | * how the free space cache loading stuff works, so you can get really weird |
| 3490 | * configurations. |
| 3491 | */ |
| 3492 | int test_add_free_space_entry(struct btrfs_block_group_cache *cache, |
| 3493 | u64 offset, u64 bytes, bool bitmap) |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 3494 | { |
Josef Bacik | dc11dd5d | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 3495 | struct btrfs_free_space_ctl *ctl = cache->free_space_ctl; |
| 3496 | struct btrfs_free_space *info = NULL, *bitmap_info; |
| 3497 | void *map = NULL; |
| 3498 | u64 bytes_added; |
| 3499 | int ret; |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 3500 | |
Josef Bacik | dc11dd5d | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 3501 | again: |
| 3502 | if (!info) { |
| 3503 | info = kmem_cache_zalloc(btrfs_free_space_cachep, GFP_NOFS); |
| 3504 | if (!info) |
| 3505 | return -ENOMEM; |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 3506 | } |
| 3507 | |
Josef Bacik | dc11dd5d | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 3508 | if (!bitmap) { |
| 3509 | spin_lock(&ctl->tree_lock); |
| 3510 | info->offset = offset; |
| 3511 | info->bytes = bytes; |
| 3512 | ret = link_free_space(ctl, info); |
| 3513 | spin_unlock(&ctl->tree_lock); |
| 3514 | if (ret) |
| 3515 | kmem_cache_free(btrfs_free_space_cachep, info); |
| 3516 | return ret; |
| 3517 | } |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 3518 | |
Josef Bacik | dc11dd5d | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 3519 | if (!map) { |
| 3520 | map = kzalloc(PAGE_CACHE_SIZE, GFP_NOFS); |
| 3521 | if (!map) { |
| 3522 | kmem_cache_free(btrfs_free_space_cachep, info); |
| 3523 | return -ENOMEM; |
| 3524 | } |
| 3525 | } |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 3526 | |
Josef Bacik | dc11dd5d | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 3527 | spin_lock(&ctl->tree_lock); |
| 3528 | bitmap_info = tree_search_offset(ctl, offset_to_bitmap(ctl, offset), |
| 3529 | 1, 0); |
| 3530 | if (!bitmap_info) { |
| 3531 | info->bitmap = map; |
| 3532 | map = NULL; |
| 3533 | add_new_bitmap(ctl, info, offset); |
| 3534 | bitmap_info = info; |
Filipe Manana | 2000552 | 2014-08-29 13:35:13 +0100 | [diff] [blame] | 3535 | info = NULL; |
Josef Bacik | dc11dd5d | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 3536 | } |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 3537 | |
Josef Bacik | dc11dd5d | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 3538 | bytes_added = add_bytes_to_bitmap(ctl, bitmap_info, offset, bytes); |
| 3539 | bytes -= bytes_added; |
| 3540 | offset += bytes_added; |
| 3541 | spin_unlock(&ctl->tree_lock); |
| 3542 | |
| 3543 | if (bytes) |
| 3544 | goto again; |
| 3545 | |
Filipe Manana | 2000552 | 2014-08-29 13:35:13 +0100 | [diff] [blame] | 3546 | if (info) |
| 3547 | kmem_cache_free(btrfs_free_space_cachep, info); |
Josef Bacik | dc11dd5d | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 3548 | if (map) |
| 3549 | kfree(map); |
| 3550 | return 0; |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 3551 | } |
| 3552 | |
| 3553 | /* |
| 3554 | * Checks to see if the given range is in the free space cache. This is really |
| 3555 | * just used to check the absence of space, so if there is free space in the |
| 3556 | * range at all we will return 1. |
| 3557 | */ |
Josef Bacik | dc11dd5d | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 3558 | int test_check_exists(struct btrfs_block_group_cache *cache, |
| 3559 | u64 offset, u64 bytes) |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 3560 | { |
| 3561 | struct btrfs_free_space_ctl *ctl = cache->free_space_ctl; |
| 3562 | struct btrfs_free_space *info; |
| 3563 | int ret = 0; |
| 3564 | |
| 3565 | spin_lock(&ctl->tree_lock); |
| 3566 | info = tree_search_offset(ctl, offset, 0, 0); |
| 3567 | if (!info) { |
| 3568 | info = tree_search_offset(ctl, offset_to_bitmap(ctl, offset), |
| 3569 | 1, 0); |
| 3570 | if (!info) |
| 3571 | goto out; |
| 3572 | } |
| 3573 | |
| 3574 | have_info: |
| 3575 | if (info->bitmap) { |
| 3576 | u64 bit_off, bit_bytes; |
| 3577 | struct rb_node *n; |
| 3578 | struct btrfs_free_space *tmp; |
| 3579 | |
| 3580 | bit_off = offset; |
| 3581 | bit_bytes = ctl->unit; |
| 3582 | ret = search_bitmap(ctl, info, &bit_off, &bit_bytes); |
| 3583 | if (!ret) { |
| 3584 | if (bit_off == offset) { |
| 3585 | ret = 1; |
| 3586 | goto out; |
| 3587 | } else if (bit_off > offset && |
| 3588 | offset + bytes > bit_off) { |
| 3589 | ret = 1; |
| 3590 | goto out; |
| 3591 | } |
| 3592 | } |
| 3593 | |
| 3594 | n = rb_prev(&info->offset_index); |
| 3595 | while (n) { |
| 3596 | tmp = rb_entry(n, struct btrfs_free_space, |
| 3597 | offset_index); |
| 3598 | if (tmp->offset + tmp->bytes < offset) |
| 3599 | break; |
| 3600 | if (offset + bytes < tmp->offset) { |
| 3601 | n = rb_prev(&info->offset_index); |
| 3602 | continue; |
| 3603 | } |
| 3604 | info = tmp; |
| 3605 | goto have_info; |
| 3606 | } |
| 3607 | |
| 3608 | n = rb_next(&info->offset_index); |
| 3609 | while (n) { |
| 3610 | tmp = rb_entry(n, struct btrfs_free_space, |
| 3611 | offset_index); |
| 3612 | if (offset + bytes < tmp->offset) |
| 3613 | break; |
| 3614 | if (tmp->offset + tmp->bytes < offset) { |
| 3615 | n = rb_next(&info->offset_index); |
| 3616 | continue; |
| 3617 | } |
| 3618 | info = tmp; |
| 3619 | goto have_info; |
| 3620 | } |
| 3621 | |
Filipe Manana | 2000552 | 2014-08-29 13:35:13 +0100 | [diff] [blame] | 3622 | ret = 0; |
Josef Bacik | 74255aa | 2013-03-15 09:47:08 -0400 | [diff] [blame] | 3623 | goto out; |
| 3624 | } |
| 3625 | |
| 3626 | if (info->offset == offset) { |
| 3627 | ret = 1; |
| 3628 | goto out; |
| 3629 | } |
| 3630 | |
| 3631 | if (offset > info->offset && offset < info->offset + info->bytes) |
| 3632 | ret = 1; |
| 3633 | out: |
| 3634 | spin_unlock(&ctl->tree_lock); |
| 3635 | return ret; |
| 3636 | } |
Josef Bacik | dc11dd5d | 2013-08-14 15:05:12 -0400 | [diff] [blame] | 3637 | #endif /* CONFIG_BTRFS_FS_RUN_SANITY_TESTS */ |