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" |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 30 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 31 | #define BITS_PER_BITMAP (PAGE_CACHE_SIZE * 8) |
| 32 | #define MAX_CACHE_BYTES_PER_GIG (32 * 1024) |
| 33 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 34 | static int link_free_space(struct btrfs_free_space_ctl *ctl, |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 35 | struct btrfs_free_space *info); |
| 36 | |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 37 | static struct inode *__lookup_free_space_inode(struct btrfs_root *root, |
| 38 | struct btrfs_path *path, |
| 39 | u64 offset) |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 40 | { |
| 41 | struct btrfs_key key; |
| 42 | struct btrfs_key location; |
| 43 | struct btrfs_disk_key disk_key; |
| 44 | struct btrfs_free_space_header *header; |
| 45 | struct extent_buffer *leaf; |
| 46 | struct inode *inode = NULL; |
| 47 | int ret; |
| 48 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 49 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 50 | key.offset = offset; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 51 | key.type = 0; |
| 52 | |
| 53 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 54 | if (ret < 0) |
| 55 | return ERR_PTR(ret); |
| 56 | if (ret > 0) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 57 | btrfs_release_path(path); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 58 | return ERR_PTR(-ENOENT); |
| 59 | } |
| 60 | |
| 61 | leaf = path->nodes[0]; |
| 62 | header = btrfs_item_ptr(leaf, path->slots[0], |
| 63 | struct btrfs_free_space_header); |
| 64 | btrfs_free_space_key(leaf, header, &disk_key); |
| 65 | btrfs_disk_key_to_cpu(&location, &disk_key); |
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 | |
| 68 | inode = btrfs_iget(root->fs_info->sb, &location, root, NULL); |
| 69 | if (!inode) |
| 70 | return ERR_PTR(-ENOENT); |
| 71 | if (IS_ERR(inode)) |
| 72 | return inode; |
| 73 | if (is_bad_inode(inode)) { |
| 74 | iput(inode); |
| 75 | return ERR_PTR(-ENOENT); |
| 76 | } |
| 77 | |
Al Viro | 528c032 | 2012-04-13 11:03:55 -0400 | [diff] [blame^] | 78 | mapping_set_gfp_mask(inode->i_mapping, |
| 79 | mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS); |
Miao Xie | adae52b | 2011-03-31 09:43:23 +0000 | [diff] [blame] | 80 | |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 81 | return inode; |
| 82 | } |
| 83 | |
| 84 | struct inode *lookup_free_space_inode(struct btrfs_root *root, |
| 85 | struct btrfs_block_group_cache |
| 86 | *block_group, struct btrfs_path *path) |
| 87 | { |
| 88 | struct inode *inode = NULL; |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 89 | u32 flags = BTRFS_INODE_NODATASUM | BTRFS_INODE_NODATACOW; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 90 | |
| 91 | spin_lock(&block_group->lock); |
| 92 | if (block_group->inode) |
| 93 | inode = igrab(block_group->inode); |
| 94 | spin_unlock(&block_group->lock); |
| 95 | if (inode) |
| 96 | return inode; |
| 97 | |
| 98 | inode = __lookup_free_space_inode(root, path, |
| 99 | block_group->key.objectid); |
| 100 | if (IS_ERR(inode)) |
| 101 | return inode; |
| 102 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 103 | spin_lock(&block_group->lock); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 104 | if (!((BTRFS_I(inode)->flags & flags) == flags)) { |
Josef Bacik | 2f35612 | 2011-06-10 15:31:13 -0400 | [diff] [blame] | 105 | printk(KERN_INFO "Old style space inode found, converting.\n"); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 106 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM | |
| 107 | BTRFS_INODE_NODATACOW; |
Josef Bacik | 2f35612 | 2011-06-10 15:31:13 -0400 | [diff] [blame] | 108 | block_group->disk_cache_state = BTRFS_DC_CLEAR; |
| 109 | } |
| 110 | |
Josef Bacik | 300e4f8 | 2011-08-29 14:06:00 -0400 | [diff] [blame] | 111 | if (!block_group->iref) { |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 112 | block_group->inode = igrab(inode); |
| 113 | block_group->iref = 1; |
| 114 | } |
| 115 | spin_unlock(&block_group->lock); |
| 116 | |
| 117 | return inode; |
| 118 | } |
| 119 | |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 120 | int __create_free_space_inode(struct btrfs_root *root, |
| 121 | struct btrfs_trans_handle *trans, |
| 122 | struct btrfs_path *path, u64 ino, u64 offset) |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 123 | { |
| 124 | struct btrfs_key key; |
| 125 | struct btrfs_disk_key disk_key; |
| 126 | struct btrfs_free_space_header *header; |
| 127 | struct btrfs_inode_item *inode_item; |
| 128 | struct extent_buffer *leaf; |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 129 | u64 flags = BTRFS_INODE_NOCOMPRESS | BTRFS_INODE_PREALLOC; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 130 | int ret; |
| 131 | |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 132 | ret = btrfs_insert_empty_inode(trans, root, path, ino); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 133 | if (ret) |
| 134 | return ret; |
| 135 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 136 | /* We inline crc's for the free disk space cache */ |
| 137 | if (ino != BTRFS_FREE_INO_OBJECTID) |
| 138 | flags |= BTRFS_INODE_NODATASUM | BTRFS_INODE_NODATACOW; |
| 139 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 140 | leaf = path->nodes[0]; |
| 141 | inode_item = btrfs_item_ptr(leaf, path->slots[0], |
| 142 | struct btrfs_inode_item); |
| 143 | btrfs_item_key(leaf, &disk_key, path->slots[0]); |
| 144 | memset_extent_buffer(leaf, 0, (unsigned long)inode_item, |
| 145 | sizeof(*inode_item)); |
| 146 | btrfs_set_inode_generation(leaf, inode_item, trans->transid); |
| 147 | btrfs_set_inode_size(leaf, inode_item, 0); |
| 148 | btrfs_set_inode_nbytes(leaf, inode_item, 0); |
| 149 | btrfs_set_inode_uid(leaf, inode_item, 0); |
| 150 | btrfs_set_inode_gid(leaf, inode_item, 0); |
| 151 | btrfs_set_inode_mode(leaf, inode_item, S_IFREG | 0600); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 152 | btrfs_set_inode_flags(leaf, inode_item, flags); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 153 | btrfs_set_inode_nlink(leaf, inode_item, 1); |
| 154 | btrfs_set_inode_transid(leaf, inode_item, trans->transid); |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 155 | btrfs_set_inode_block_group(leaf, inode_item, offset); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 156 | btrfs_mark_buffer_dirty(leaf); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 157 | btrfs_release_path(path); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 158 | |
| 159 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 160 | key.offset = offset; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 161 | key.type = 0; |
| 162 | |
| 163 | ret = btrfs_insert_empty_item(trans, root, path, &key, |
| 164 | sizeof(struct btrfs_free_space_header)); |
| 165 | if (ret < 0) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 166 | btrfs_release_path(path); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 167 | return ret; |
| 168 | } |
| 169 | leaf = path->nodes[0]; |
| 170 | header = btrfs_item_ptr(leaf, path->slots[0], |
| 171 | struct btrfs_free_space_header); |
| 172 | memset_extent_buffer(leaf, 0, (unsigned long)header, sizeof(*header)); |
| 173 | btrfs_set_free_space_key(leaf, header, &disk_key); |
| 174 | btrfs_mark_buffer_dirty(leaf); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 175 | btrfs_release_path(path); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 176 | |
| 177 | return 0; |
| 178 | } |
| 179 | |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 180 | int create_free_space_inode(struct btrfs_root *root, |
| 181 | struct btrfs_trans_handle *trans, |
| 182 | struct btrfs_block_group_cache *block_group, |
| 183 | struct btrfs_path *path) |
| 184 | { |
| 185 | int ret; |
| 186 | u64 ino; |
| 187 | |
| 188 | ret = btrfs_find_free_objectid(root, &ino); |
| 189 | if (ret < 0) |
| 190 | return ret; |
| 191 | |
| 192 | return __create_free_space_inode(root, trans, path, ino, |
| 193 | block_group->key.objectid); |
| 194 | } |
| 195 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 196 | int btrfs_truncate_free_space_cache(struct btrfs_root *root, |
| 197 | struct btrfs_trans_handle *trans, |
| 198 | struct btrfs_path *path, |
| 199 | struct inode *inode) |
| 200 | { |
Liu Bo | 65450aa | 2011-09-11 10:52:24 -0400 | [diff] [blame] | 201 | struct btrfs_block_rsv *rsv; |
Josef Bacik | c817431 | 2011-11-02 09:29:35 -0400 | [diff] [blame] | 202 | u64 needed_bytes; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 203 | loff_t oldsize; |
| 204 | int ret = 0; |
| 205 | |
Liu Bo | 65450aa | 2011-09-11 10:52:24 -0400 | [diff] [blame] | 206 | rsv = trans->block_rsv; |
Josef Bacik | c817431 | 2011-11-02 09:29:35 -0400 | [diff] [blame] | 207 | trans->block_rsv = &root->fs_info->global_block_rsv; |
| 208 | |
| 209 | /* 1 for slack space, 1 for updating the inode */ |
| 210 | needed_bytes = btrfs_calc_trunc_metadata_size(root, 1) + |
| 211 | btrfs_calc_trans_metadata_size(root, 1); |
| 212 | |
| 213 | spin_lock(&trans->block_rsv->lock); |
| 214 | if (trans->block_rsv->reserved < needed_bytes) { |
| 215 | spin_unlock(&trans->block_rsv->lock); |
| 216 | trans->block_rsv = rsv; |
| 217 | return -ENOSPC; |
| 218 | } |
| 219 | spin_unlock(&trans->block_rsv->lock); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 220 | |
| 221 | oldsize = i_size_read(inode); |
| 222 | btrfs_i_size_write(inode, 0); |
| 223 | truncate_pagecache(inode, oldsize, 0); |
| 224 | |
| 225 | /* |
| 226 | * We don't need an orphan item because truncating the free space cache |
| 227 | * will never be split across transactions. |
| 228 | */ |
| 229 | ret = btrfs_truncate_inode_items(trans, root, inode, |
| 230 | 0, BTRFS_EXTENT_DATA_KEY); |
Liu Bo | 65450aa | 2011-09-11 10:52:24 -0400 | [diff] [blame] | 231 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 232 | if (ret) { |
Josef Bacik | c817431 | 2011-11-02 09:29:35 -0400 | [diff] [blame] | 233 | trans->block_rsv = rsv; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 234 | btrfs_abort_transaction(trans, root, ret); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 235 | return ret; |
| 236 | } |
| 237 | |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 238 | ret = btrfs_update_inode(trans, root, inode); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 239 | if (ret) |
| 240 | btrfs_abort_transaction(trans, root, ret); |
Josef Bacik | c817431 | 2011-11-02 09:29:35 -0400 | [diff] [blame] | 241 | trans->block_rsv = rsv; |
| 242 | |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 243 | return ret; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 244 | } |
| 245 | |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 246 | static int readahead_cache(struct inode *inode) |
| 247 | { |
| 248 | struct file_ra_state *ra; |
| 249 | unsigned long last_index; |
| 250 | |
| 251 | ra = kzalloc(sizeof(*ra), GFP_NOFS); |
| 252 | if (!ra) |
| 253 | return -ENOMEM; |
| 254 | |
| 255 | file_ra_state_init(ra, inode->i_mapping); |
| 256 | last_index = (i_size_read(inode) - 1) >> PAGE_CACHE_SHIFT; |
| 257 | |
| 258 | page_cache_sync_readahead(inode->i_mapping, ra, NULL, 0, last_index); |
| 259 | |
| 260 | kfree(ra); |
| 261 | |
| 262 | return 0; |
| 263 | } |
| 264 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 265 | struct io_ctl { |
| 266 | void *cur, *orig; |
| 267 | struct page *page; |
| 268 | struct page **pages; |
| 269 | struct btrfs_root *root; |
| 270 | unsigned long size; |
| 271 | int index; |
| 272 | int num_pages; |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 273 | unsigned check_crcs:1; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 274 | }; |
| 275 | |
| 276 | static int io_ctl_init(struct io_ctl *io_ctl, struct inode *inode, |
| 277 | struct btrfs_root *root) |
| 278 | { |
| 279 | memset(io_ctl, 0, sizeof(struct io_ctl)); |
| 280 | io_ctl->num_pages = (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> |
| 281 | PAGE_CACHE_SHIFT; |
| 282 | io_ctl->pages = kzalloc(sizeof(struct page *) * io_ctl->num_pages, |
| 283 | GFP_NOFS); |
| 284 | if (!io_ctl->pages) |
| 285 | return -ENOMEM; |
| 286 | io_ctl->root = root; |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 287 | if (btrfs_ino(inode) != BTRFS_FREE_INO_OBJECTID) |
| 288 | io_ctl->check_crcs = 1; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 289 | return 0; |
| 290 | } |
| 291 | |
| 292 | static void io_ctl_free(struct io_ctl *io_ctl) |
| 293 | { |
| 294 | kfree(io_ctl->pages); |
| 295 | } |
| 296 | |
| 297 | static void io_ctl_unmap_page(struct io_ctl *io_ctl) |
| 298 | { |
| 299 | if (io_ctl->cur) { |
| 300 | kunmap(io_ctl->page); |
| 301 | io_ctl->cur = NULL; |
| 302 | io_ctl->orig = NULL; |
| 303 | } |
| 304 | } |
| 305 | |
| 306 | static void io_ctl_map_page(struct io_ctl *io_ctl, int clear) |
| 307 | { |
| 308 | WARN_ON(io_ctl->cur); |
| 309 | BUG_ON(io_ctl->index >= io_ctl->num_pages); |
| 310 | io_ctl->page = io_ctl->pages[io_ctl->index++]; |
| 311 | io_ctl->cur = kmap(io_ctl->page); |
| 312 | io_ctl->orig = io_ctl->cur; |
| 313 | io_ctl->size = PAGE_CACHE_SIZE; |
| 314 | if (clear) |
| 315 | memset(io_ctl->cur, 0, PAGE_CACHE_SIZE); |
| 316 | } |
| 317 | |
| 318 | static void io_ctl_drop_pages(struct io_ctl *io_ctl) |
| 319 | { |
| 320 | int i; |
| 321 | |
| 322 | io_ctl_unmap_page(io_ctl); |
| 323 | |
| 324 | for (i = 0; i < io_ctl->num_pages; i++) { |
Li Zefan | a1ee5a4 | 2012-01-09 14:27:42 +0800 | [diff] [blame] | 325 | if (io_ctl->pages[i]) { |
| 326 | ClearPageChecked(io_ctl->pages[i]); |
| 327 | unlock_page(io_ctl->pages[i]); |
| 328 | page_cache_release(io_ctl->pages[i]); |
| 329 | } |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 330 | } |
| 331 | } |
| 332 | |
| 333 | static int io_ctl_prepare_pages(struct io_ctl *io_ctl, struct inode *inode, |
| 334 | int uptodate) |
| 335 | { |
| 336 | struct page *page; |
| 337 | gfp_t mask = btrfs_alloc_write_mask(inode->i_mapping); |
| 338 | int i; |
| 339 | |
| 340 | for (i = 0; i < io_ctl->num_pages; i++) { |
| 341 | page = find_or_create_page(inode->i_mapping, i, mask); |
| 342 | if (!page) { |
| 343 | io_ctl_drop_pages(io_ctl); |
| 344 | return -ENOMEM; |
| 345 | } |
| 346 | io_ctl->pages[i] = page; |
| 347 | if (uptodate && !PageUptodate(page)) { |
| 348 | btrfs_readpage(NULL, page); |
| 349 | lock_page(page); |
| 350 | if (!PageUptodate(page)) { |
| 351 | printk(KERN_ERR "btrfs: error reading free " |
| 352 | "space cache\n"); |
| 353 | io_ctl_drop_pages(io_ctl); |
| 354 | return -EIO; |
| 355 | } |
| 356 | } |
| 357 | } |
| 358 | |
Josef Bacik | f7d61dc | 2011-11-15 09:31:24 -0500 | [diff] [blame] | 359 | for (i = 0; i < io_ctl->num_pages; i++) { |
| 360 | clear_page_dirty_for_io(io_ctl->pages[i]); |
| 361 | set_page_extent_mapped(io_ctl->pages[i]); |
| 362 | } |
| 363 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 364 | return 0; |
| 365 | } |
| 366 | |
| 367 | static void io_ctl_set_generation(struct io_ctl *io_ctl, u64 generation) |
| 368 | { |
Al Viro | 528c032 | 2012-04-13 11:03:55 -0400 | [diff] [blame^] | 369 | __le64 *val; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 370 | |
| 371 | io_ctl_map_page(io_ctl, 1); |
| 372 | |
| 373 | /* |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 374 | * Skip the csum areas. If we don't check crcs then we just have a |
| 375 | * 64bit chunk at the front of the first page. |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 376 | */ |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 377 | if (io_ctl->check_crcs) { |
| 378 | io_ctl->cur += (sizeof(u32) * io_ctl->num_pages); |
| 379 | io_ctl->size -= sizeof(u64) + (sizeof(u32) * io_ctl->num_pages); |
| 380 | } else { |
| 381 | io_ctl->cur += sizeof(u64); |
| 382 | io_ctl->size -= sizeof(u64) * 2; |
| 383 | } |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 384 | |
| 385 | val = io_ctl->cur; |
| 386 | *val = cpu_to_le64(generation); |
| 387 | io_ctl->cur += sizeof(u64); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 388 | } |
| 389 | |
| 390 | static int io_ctl_check_generation(struct io_ctl *io_ctl, u64 generation) |
| 391 | { |
Al Viro | 528c032 | 2012-04-13 11:03:55 -0400 | [diff] [blame^] | 392 | __le64 *gen; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 393 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 394 | /* |
| 395 | * Skip the crc area. If we don't check crcs then we just have a 64bit |
| 396 | * chunk at the front of the first page. |
| 397 | */ |
| 398 | if (io_ctl->check_crcs) { |
| 399 | io_ctl->cur += sizeof(u32) * io_ctl->num_pages; |
| 400 | io_ctl->size -= sizeof(u64) + |
| 401 | (sizeof(u32) * io_ctl->num_pages); |
| 402 | } else { |
| 403 | io_ctl->cur += sizeof(u64); |
| 404 | io_ctl->size -= sizeof(u64) * 2; |
| 405 | } |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 406 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 407 | gen = io_ctl->cur; |
| 408 | if (le64_to_cpu(*gen) != generation) { |
| 409 | printk_ratelimited(KERN_ERR "btrfs: space cache generation " |
| 410 | "(%Lu) does not match inode (%Lu)\n", *gen, |
| 411 | generation); |
| 412 | io_ctl_unmap_page(io_ctl); |
| 413 | return -EIO; |
| 414 | } |
| 415 | io_ctl->cur += sizeof(u64); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 416 | return 0; |
| 417 | } |
| 418 | |
| 419 | static void io_ctl_set_crc(struct io_ctl *io_ctl, int index) |
| 420 | { |
| 421 | u32 *tmp; |
| 422 | u32 crc = ~(u32)0; |
| 423 | unsigned offset = 0; |
| 424 | |
| 425 | if (!io_ctl->check_crcs) { |
| 426 | io_ctl_unmap_page(io_ctl); |
| 427 | return; |
| 428 | } |
| 429 | |
| 430 | if (index == 0) |
Justin P. Mattock | cb54f25 | 2011-11-21 08:43:28 -0800 | [diff] [blame] | 431 | offset = sizeof(u32) * io_ctl->num_pages; |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 432 | |
| 433 | crc = btrfs_csum_data(io_ctl->root, io_ctl->orig + offset, crc, |
| 434 | PAGE_CACHE_SIZE - offset); |
| 435 | btrfs_csum_final(crc, (char *)&crc); |
| 436 | io_ctl_unmap_page(io_ctl); |
| 437 | tmp = kmap(io_ctl->pages[0]); |
| 438 | tmp += index; |
| 439 | *tmp = crc; |
| 440 | kunmap(io_ctl->pages[0]); |
| 441 | } |
| 442 | |
| 443 | static int io_ctl_check_crc(struct io_ctl *io_ctl, int index) |
| 444 | { |
| 445 | u32 *tmp, val; |
| 446 | u32 crc = ~(u32)0; |
| 447 | unsigned offset = 0; |
| 448 | |
| 449 | if (!io_ctl->check_crcs) { |
| 450 | io_ctl_map_page(io_ctl, 0); |
| 451 | return 0; |
| 452 | } |
| 453 | |
| 454 | if (index == 0) |
| 455 | offset = sizeof(u32) * io_ctl->num_pages; |
| 456 | |
| 457 | tmp = kmap(io_ctl->pages[0]); |
| 458 | tmp += index; |
| 459 | val = *tmp; |
| 460 | kunmap(io_ctl->pages[0]); |
| 461 | |
| 462 | io_ctl_map_page(io_ctl, 0); |
| 463 | crc = btrfs_csum_data(io_ctl->root, io_ctl->orig + offset, crc, |
| 464 | PAGE_CACHE_SIZE - offset); |
| 465 | btrfs_csum_final(crc, (char *)&crc); |
| 466 | if (val != crc) { |
| 467 | printk_ratelimited(KERN_ERR "btrfs: csum mismatch on free " |
| 468 | "space cache\n"); |
| 469 | io_ctl_unmap_page(io_ctl); |
| 470 | return -EIO; |
| 471 | } |
| 472 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 473 | return 0; |
| 474 | } |
| 475 | |
| 476 | static int io_ctl_add_entry(struct io_ctl *io_ctl, u64 offset, u64 bytes, |
| 477 | void *bitmap) |
| 478 | { |
| 479 | struct btrfs_free_space_entry *entry; |
| 480 | |
| 481 | if (!io_ctl->cur) |
| 482 | return -ENOSPC; |
| 483 | |
| 484 | entry = io_ctl->cur; |
| 485 | entry->offset = cpu_to_le64(offset); |
| 486 | entry->bytes = cpu_to_le64(bytes); |
| 487 | entry->type = (bitmap) ? BTRFS_FREE_SPACE_BITMAP : |
| 488 | BTRFS_FREE_SPACE_EXTENT; |
| 489 | io_ctl->cur += sizeof(struct btrfs_free_space_entry); |
| 490 | io_ctl->size -= sizeof(struct btrfs_free_space_entry); |
| 491 | |
| 492 | if (io_ctl->size >= sizeof(struct btrfs_free_space_entry)) |
| 493 | return 0; |
| 494 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 495 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 496 | |
| 497 | /* No more pages to map */ |
| 498 | if (io_ctl->index >= io_ctl->num_pages) |
| 499 | return 0; |
| 500 | |
| 501 | /* map the next page */ |
| 502 | io_ctl_map_page(io_ctl, 1); |
| 503 | return 0; |
| 504 | } |
| 505 | |
| 506 | static int io_ctl_add_bitmap(struct io_ctl *io_ctl, void *bitmap) |
| 507 | { |
| 508 | if (!io_ctl->cur) |
| 509 | return -ENOSPC; |
| 510 | |
| 511 | /* |
| 512 | * If we aren't at the start of the current page, unmap this one and |
| 513 | * map the next one if there is any left. |
| 514 | */ |
| 515 | if (io_ctl->cur != io_ctl->orig) { |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 516 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 517 | if (io_ctl->index >= io_ctl->num_pages) |
| 518 | return -ENOSPC; |
| 519 | io_ctl_map_page(io_ctl, 0); |
| 520 | } |
| 521 | |
| 522 | memcpy(io_ctl->cur, bitmap, PAGE_CACHE_SIZE); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 523 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 524 | if (io_ctl->index < io_ctl->num_pages) |
| 525 | io_ctl_map_page(io_ctl, 0); |
| 526 | return 0; |
| 527 | } |
| 528 | |
| 529 | static void io_ctl_zero_remaining_pages(struct io_ctl *io_ctl) |
| 530 | { |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 531 | /* |
| 532 | * If we're not on the boundary we know we've modified the page and we |
| 533 | * need to crc the page. |
| 534 | */ |
| 535 | if (io_ctl->cur != io_ctl->orig) |
| 536 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); |
| 537 | else |
| 538 | io_ctl_unmap_page(io_ctl); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 539 | |
| 540 | while (io_ctl->index < io_ctl->num_pages) { |
| 541 | io_ctl_map_page(io_ctl, 1); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 542 | io_ctl_set_crc(io_ctl, io_ctl->index - 1); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 543 | } |
| 544 | } |
| 545 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 546 | static int io_ctl_read_entry(struct io_ctl *io_ctl, |
| 547 | struct btrfs_free_space *entry, u8 *type) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 548 | { |
| 549 | struct btrfs_free_space_entry *e; |
Josef Bacik | 2f120c0 | 2011-11-10 20:45:05 -0500 | [diff] [blame] | 550 | int ret; |
| 551 | |
| 552 | if (!io_ctl->cur) { |
| 553 | ret = io_ctl_check_crc(io_ctl, io_ctl->index); |
| 554 | if (ret) |
| 555 | return ret; |
| 556 | } |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 557 | |
| 558 | e = io_ctl->cur; |
| 559 | entry->offset = le64_to_cpu(e->offset); |
| 560 | entry->bytes = le64_to_cpu(e->bytes); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 561 | *type = e->type; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 562 | io_ctl->cur += sizeof(struct btrfs_free_space_entry); |
| 563 | io_ctl->size -= sizeof(struct btrfs_free_space_entry); |
| 564 | |
| 565 | if (io_ctl->size >= sizeof(struct btrfs_free_space_entry)) |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 566 | return 0; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 567 | |
| 568 | io_ctl_unmap_page(io_ctl); |
| 569 | |
Josef Bacik | 2f120c0 | 2011-11-10 20:45:05 -0500 | [diff] [blame] | 570 | return 0; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 571 | } |
| 572 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 573 | static int io_ctl_read_bitmap(struct io_ctl *io_ctl, |
| 574 | struct btrfs_free_space *entry) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 575 | { |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 576 | int ret; |
| 577 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 578 | ret = io_ctl_check_crc(io_ctl, io_ctl->index); |
| 579 | if (ret) |
| 580 | return ret; |
| 581 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 582 | memcpy(entry->bitmap, io_ctl->cur, PAGE_CACHE_SIZE); |
| 583 | io_ctl_unmap_page(io_ctl); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 584 | |
| 585 | return 0; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 586 | } |
| 587 | |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 588 | int __load_free_space_cache(struct btrfs_root *root, struct inode *inode, |
| 589 | struct btrfs_free_space_ctl *ctl, |
| 590 | struct btrfs_path *path, u64 offset) |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 591 | { |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 592 | struct btrfs_free_space_header *header; |
| 593 | struct extent_buffer *leaf; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 594 | struct io_ctl io_ctl; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 595 | struct btrfs_key key; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 596 | struct btrfs_free_space *e, *n; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 597 | struct list_head bitmaps; |
| 598 | u64 num_entries; |
| 599 | u64 num_bitmaps; |
| 600 | u64 generation; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 601 | u8 type; |
Josef Bacik | f6a3982 | 2011-06-06 10:50:35 -0400 | [diff] [blame] | 602 | int ret = 0; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 603 | |
| 604 | INIT_LIST_HEAD(&bitmaps); |
| 605 | |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 606 | /* Nothing in the space cache, goodbye */ |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 607 | if (!i_size_read(inode)) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 608 | return 0; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 609 | |
| 610 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 611 | key.offset = offset; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 612 | key.type = 0; |
| 613 | |
| 614 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 615 | if (ret < 0) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 616 | return 0; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 617 | else if (ret > 0) { |
Chris Mason | 945d896 | 2011-05-22 12:33:42 -0400 | [diff] [blame] | 618 | btrfs_release_path(path); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 619 | return 0; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 620 | } |
| 621 | |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 622 | ret = -1; |
| 623 | |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 624 | leaf = path->nodes[0]; |
| 625 | header = btrfs_item_ptr(leaf, path->slots[0], |
| 626 | struct btrfs_free_space_header); |
| 627 | num_entries = btrfs_free_space_entries(leaf, header); |
| 628 | num_bitmaps = btrfs_free_space_bitmaps(leaf, header); |
| 629 | generation = btrfs_free_space_generation(leaf, header); |
Chris Mason | 945d896 | 2011-05-22 12:33:42 -0400 | [diff] [blame] | 630 | btrfs_release_path(path); |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 631 | |
| 632 | if (BTRFS_I(inode)->generation != generation) { |
| 633 | printk(KERN_ERR "btrfs: free space inode generation (%llu) did" |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 634 | " not match free space cache generation (%llu)\n", |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 635 | (unsigned long long)BTRFS_I(inode)->generation, |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 636 | (unsigned long long)generation); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 637 | return 0; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 638 | } |
| 639 | |
| 640 | if (!num_entries) |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 641 | return 0; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 642 | |
Li Zefan | 706efc6 | 2012-01-09 14:36:28 +0800 | [diff] [blame] | 643 | ret = io_ctl_init(&io_ctl, inode, root); |
| 644 | if (ret) |
| 645 | return ret; |
| 646 | |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 647 | ret = readahead_cache(inode); |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 648 | if (ret) |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 649 | goto out; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 650 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 651 | ret = io_ctl_prepare_pages(&io_ctl, inode, 1); |
| 652 | if (ret) |
| 653 | goto out; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 654 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 655 | ret = io_ctl_check_crc(&io_ctl, 0); |
| 656 | if (ret) |
| 657 | goto free_cache; |
| 658 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 659 | ret = io_ctl_check_generation(&io_ctl, generation); |
| 660 | if (ret) |
| 661 | goto free_cache; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 662 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 663 | while (num_entries) { |
| 664 | e = kmem_cache_zalloc(btrfs_free_space_cachep, |
| 665 | GFP_NOFS); |
| 666 | if (!e) |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 667 | goto free_cache; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 668 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 669 | ret = io_ctl_read_entry(&io_ctl, e, &type); |
| 670 | if (ret) { |
| 671 | kmem_cache_free(btrfs_free_space_cachep, e); |
| 672 | goto free_cache; |
| 673 | } |
| 674 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 675 | if (!e->bytes) { |
| 676 | kmem_cache_free(btrfs_free_space_cachep, e); |
| 677 | goto free_cache; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 678 | } |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 679 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 680 | if (type == BTRFS_FREE_SPACE_EXTENT) { |
| 681 | spin_lock(&ctl->tree_lock); |
| 682 | ret = link_free_space(ctl, e); |
| 683 | spin_unlock(&ctl->tree_lock); |
| 684 | if (ret) { |
| 685 | printk(KERN_ERR "Duplicate entries in " |
| 686 | "free space cache, dumping\n"); |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 687 | kmem_cache_free(btrfs_free_space_cachep, e); |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 688 | goto free_cache; |
| 689 | } |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 690 | } else { |
| 691 | BUG_ON(!num_bitmaps); |
| 692 | num_bitmaps--; |
| 693 | e->bitmap = kzalloc(PAGE_CACHE_SIZE, GFP_NOFS); |
| 694 | if (!e->bitmap) { |
| 695 | kmem_cache_free( |
| 696 | btrfs_free_space_cachep, e); |
| 697 | goto free_cache; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 698 | } |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 699 | spin_lock(&ctl->tree_lock); |
| 700 | ret = link_free_space(ctl, e); |
| 701 | ctl->total_bitmaps++; |
| 702 | ctl->op->recalc_thresholds(ctl); |
| 703 | spin_unlock(&ctl->tree_lock); |
| 704 | if (ret) { |
| 705 | printk(KERN_ERR "Duplicate entries in " |
| 706 | "free space cache, dumping\n"); |
| 707 | kmem_cache_free(btrfs_free_space_cachep, e); |
| 708 | goto free_cache; |
| 709 | } |
| 710 | list_add_tail(&e->list, &bitmaps); |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 711 | } |
| 712 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 713 | num_entries--; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 714 | } |
| 715 | |
Josef Bacik | 2f120c0 | 2011-11-10 20:45:05 -0500 | [diff] [blame] | 716 | io_ctl_unmap_page(&io_ctl); |
| 717 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 718 | /* |
| 719 | * We add the bitmaps at the end of the entries in order that |
| 720 | * the bitmap entries are added to the cache. |
| 721 | */ |
| 722 | list_for_each_entry_safe(e, n, &bitmaps, list) { |
| 723 | list_del_init(&e->list); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 724 | ret = io_ctl_read_bitmap(&io_ctl, e); |
| 725 | if (ret) |
| 726 | goto free_cache; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 727 | } |
| 728 | |
| 729 | io_ctl_drop_pages(&io_ctl); |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 730 | ret = 1; |
| 731 | out: |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 732 | io_ctl_free(&io_ctl); |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 733 | return ret; |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 734 | free_cache: |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 735 | io_ctl_drop_pages(&io_ctl); |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 736 | __btrfs_remove_free_space_cache(ctl); |
Josef Bacik | 9d66e23 | 2010-08-25 16:54:15 -0400 | [diff] [blame] | 737 | goto out; |
| 738 | } |
| 739 | |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 740 | int load_free_space_cache(struct btrfs_fs_info *fs_info, |
| 741 | struct btrfs_block_group_cache *block_group) |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 742 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 743 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 744 | struct btrfs_root *root = fs_info->tree_root; |
| 745 | struct inode *inode; |
| 746 | struct btrfs_path *path; |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 747 | int ret = 0; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 748 | bool matched; |
| 749 | u64 used = btrfs_block_group_used(&block_group->item); |
| 750 | |
| 751 | /* |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 752 | * If this block group has been marked to be cleared for one reason or |
| 753 | * another then we can't trust the on disk cache, so just return. |
| 754 | */ |
| 755 | spin_lock(&block_group->lock); |
| 756 | if (block_group->disk_cache_state != BTRFS_DC_WRITTEN) { |
| 757 | spin_unlock(&block_group->lock); |
| 758 | return 0; |
| 759 | } |
| 760 | spin_unlock(&block_group->lock); |
| 761 | |
| 762 | path = btrfs_alloc_path(); |
| 763 | if (!path) |
| 764 | return 0; |
Josef Bacik | d53ba47 | 2012-04-12 16:03:57 -0400 | [diff] [blame] | 765 | path->search_commit_root = 1; |
| 766 | path->skip_locking = 1; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 767 | |
| 768 | inode = lookup_free_space_inode(root, block_group, path); |
| 769 | if (IS_ERR(inode)) { |
| 770 | btrfs_free_path(path); |
| 771 | return 0; |
| 772 | } |
| 773 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 774 | /* We may have converted the inode and made the cache invalid. */ |
| 775 | spin_lock(&block_group->lock); |
| 776 | if (block_group->disk_cache_state != BTRFS_DC_WRITTEN) { |
| 777 | spin_unlock(&block_group->lock); |
Tsutomu Itoh | a7e221e | 2012-02-14 17:12:23 +0900 | [diff] [blame] | 778 | btrfs_free_path(path); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 779 | goto out; |
| 780 | } |
| 781 | spin_unlock(&block_group->lock); |
| 782 | |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 783 | ret = __load_free_space_cache(fs_info->tree_root, inode, ctl, |
| 784 | path, block_group->key.objectid); |
| 785 | btrfs_free_path(path); |
| 786 | if (ret <= 0) |
| 787 | goto out; |
| 788 | |
| 789 | spin_lock(&ctl->tree_lock); |
| 790 | matched = (ctl->free_space == (block_group->key.offset - used - |
| 791 | block_group->bytes_super)); |
| 792 | spin_unlock(&ctl->tree_lock); |
| 793 | |
| 794 | if (!matched) { |
| 795 | __btrfs_remove_free_space_cache(ctl); |
| 796 | printk(KERN_ERR "block group %llu has an wrong amount of free " |
| 797 | "space\n", block_group->key.objectid); |
| 798 | ret = -1; |
| 799 | } |
| 800 | out: |
| 801 | if (ret < 0) { |
| 802 | /* This cache is bogus, make sure it gets cleared */ |
| 803 | spin_lock(&block_group->lock); |
| 804 | block_group->disk_cache_state = BTRFS_DC_CLEAR; |
| 805 | spin_unlock(&block_group->lock); |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 806 | ret = 0; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 807 | |
| 808 | printk(KERN_ERR "btrfs: failed to load free space cache " |
| 809 | "for block group %llu\n", block_group->key.objectid); |
| 810 | } |
| 811 | |
| 812 | iput(inode); |
| 813 | return ret; |
| 814 | } |
| 815 | |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 816 | /** |
| 817 | * __btrfs_write_out_cache - write out cached info to an inode |
| 818 | * @root - the root the inode belongs to |
| 819 | * @ctl - the free space cache we are going to write out |
| 820 | * @block_group - the block_group for this cache if it belongs to a block_group |
| 821 | * @trans - the trans handle |
| 822 | * @path - the path to use |
| 823 | * @offset - the offset for the key we'll insert |
| 824 | * |
| 825 | * This function writes out a free space cache struct to disk for quick recovery |
| 826 | * on mount. This will return 0 if it was successfull in writing the cache out, |
| 827 | * and -1 if it was not. |
| 828 | */ |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 829 | int __btrfs_write_out_cache(struct btrfs_root *root, struct inode *inode, |
| 830 | struct btrfs_free_space_ctl *ctl, |
| 831 | struct btrfs_block_group_cache *block_group, |
| 832 | struct btrfs_trans_handle *trans, |
| 833 | struct btrfs_path *path, u64 offset) |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 834 | { |
| 835 | struct btrfs_free_space_header *header; |
| 836 | struct extent_buffer *leaf; |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 837 | struct rb_node *node; |
| 838 | struct list_head *pos, *n; |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 839 | struct extent_state *cached_state = NULL; |
Josef Bacik | 43be214 | 2011-04-01 14:55:00 +0000 | [diff] [blame] | 840 | struct btrfs_free_cluster *cluster = NULL; |
| 841 | struct extent_io_tree *unpin = NULL; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 842 | struct io_ctl io_ctl; |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 843 | struct list_head bitmap_list; |
| 844 | struct btrfs_key key; |
Li Zefan | db804f2 | 2012-01-10 16:41:01 +0800 | [diff] [blame] | 845 | u64 start, extent_start, extent_end, len; |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 846 | int entries = 0; |
| 847 | int bitmaps = 0; |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 848 | int ret; |
| 849 | int err = -1; |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 850 | |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 851 | INIT_LIST_HEAD(&bitmap_list); |
| 852 | |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 853 | if (!i_size_read(inode)) |
| 854 | return -1; |
Josef Bacik | 2b20982 | 2010-12-03 13:17:53 -0500 | [diff] [blame] | 855 | |
Li Zefan | 706efc6 | 2012-01-09 14:36:28 +0800 | [diff] [blame] | 856 | ret = io_ctl_init(&io_ctl, inode, root); |
| 857 | if (ret) |
| 858 | return -1; |
Josef Bacik | be1a12a | 2011-04-06 13:05:22 -0400 | [diff] [blame] | 859 | |
Josef Bacik | 43be214 | 2011-04-01 14:55:00 +0000 | [diff] [blame] | 860 | /* Get the cluster for this block_group if it exists */ |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 861 | if (block_group && !list_empty(&block_group->cluster_list)) |
Josef Bacik | 43be214 | 2011-04-01 14:55:00 +0000 | [diff] [blame] | 862 | cluster = list_entry(block_group->cluster_list.next, |
| 863 | struct btrfs_free_cluster, |
| 864 | block_group_list); |
| 865 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 866 | /* Lock all pages first so we can lock the extent safely. */ |
| 867 | io_ctl_prepare_pages(&io_ctl, inode, 0); |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 868 | |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 869 | lock_extent_bits(&BTRFS_I(inode)->io_tree, 0, i_size_read(inode) - 1, |
Jeff Mahoney | d008237 | 2012-03-01 14:57:19 +0100 | [diff] [blame] | 870 | 0, &cached_state); |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 871 | |
Josef Bacik | f75b130 | 2011-10-05 10:00:18 -0400 | [diff] [blame] | 872 | node = rb_first(&ctl->free_space_offset); |
| 873 | if (!node && cluster) { |
| 874 | node = rb_first(&cluster->root); |
| 875 | cluster = NULL; |
| 876 | } |
| 877 | |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 878 | /* Make sure we can fit our crcs into the first page */ |
| 879 | if (io_ctl.check_crcs && |
| 880 | (io_ctl.num_pages * sizeof(u32)) >= PAGE_CACHE_SIZE) { |
| 881 | WARN_ON(1); |
| 882 | goto out_nospc; |
| 883 | } |
| 884 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 885 | io_ctl_set_generation(&io_ctl, trans->transid); |
| 886 | |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 887 | /* Write out the extent entries */ |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 888 | while (node) { |
| 889 | struct btrfs_free_space *e; |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 890 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 891 | e = rb_entry(node, struct btrfs_free_space, offset_index); |
| 892 | entries++; |
Josef Bacik | 43be214 | 2011-04-01 14:55:00 +0000 | [diff] [blame] | 893 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 894 | ret = io_ctl_add_entry(&io_ctl, e->offset, e->bytes, |
| 895 | e->bitmap); |
| 896 | if (ret) |
| 897 | goto out_nospc; |
| 898 | |
| 899 | if (e->bitmap) { |
| 900 | list_add_tail(&e->list, &bitmap_list); |
| 901 | bitmaps++; |
| 902 | } |
| 903 | node = rb_next(node); |
| 904 | if (!node && cluster) { |
| 905 | node = rb_first(&cluster->root); |
| 906 | cluster = NULL; |
| 907 | } |
| 908 | } |
| 909 | |
| 910 | /* |
| 911 | * We want to add any pinned extents to our free space cache |
| 912 | * so we don't leak the space |
| 913 | */ |
Li Zefan | db804f2 | 2012-01-10 16:41:01 +0800 | [diff] [blame] | 914 | |
| 915 | /* |
| 916 | * We shouldn't have switched the pinned extents yet so this is the |
| 917 | * right one |
| 918 | */ |
| 919 | unpin = root->fs_info->pinned_extents; |
| 920 | |
| 921 | if (block_group) |
| 922 | start = block_group->key.objectid; |
| 923 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 924 | while (block_group && (start < block_group->key.objectid + |
| 925 | block_group->key.offset)) { |
Li Zefan | db804f2 | 2012-01-10 16:41:01 +0800 | [diff] [blame] | 926 | ret = find_first_extent_bit(unpin, start, |
| 927 | &extent_start, &extent_end, |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 928 | EXTENT_DIRTY); |
| 929 | if (ret) { |
| 930 | ret = 0; |
Josef Bacik | be1a12a | 2011-04-06 13:05:22 -0400 | [diff] [blame] | 931 | break; |
| 932 | } |
| 933 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 934 | /* This pinned extent is out of our range */ |
Li Zefan | db804f2 | 2012-01-10 16:41:01 +0800 | [diff] [blame] | 935 | if (extent_start >= block_group->key.objectid + |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 936 | block_group->key.offset) |
| 937 | break; |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 938 | |
Li Zefan | db804f2 | 2012-01-10 16:41:01 +0800 | [diff] [blame] | 939 | extent_start = max(extent_start, start); |
| 940 | extent_end = min(block_group->key.objectid + |
| 941 | block_group->key.offset, extent_end + 1); |
| 942 | len = extent_end - extent_start; |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 943 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 944 | entries++; |
Li Zefan | db804f2 | 2012-01-10 16:41:01 +0800 | [diff] [blame] | 945 | ret = io_ctl_add_entry(&io_ctl, extent_start, len, NULL); |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 946 | if (ret) |
| 947 | goto out_nospc; |
Josef Bacik | 2f35612 | 2011-06-10 15:31:13 -0400 | [diff] [blame] | 948 | |
Li Zefan | db804f2 | 2012-01-10 16:41:01 +0800 | [diff] [blame] | 949 | start = extent_end; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 950 | } |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 951 | |
| 952 | /* Write out the bitmaps */ |
| 953 | list_for_each_safe(pos, n, &bitmap_list) { |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 954 | struct btrfs_free_space *entry = |
| 955 | list_entry(pos, struct btrfs_free_space, list); |
| 956 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 957 | ret = io_ctl_add_bitmap(&io_ctl, entry->bitmap); |
| 958 | if (ret) |
| 959 | goto out_nospc; |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 960 | list_del_init(&entry->list); |
Josef Bacik | be1a12a | 2011-04-06 13:05:22 -0400 | [diff] [blame] | 961 | } |
| 962 | |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 963 | /* Zero out the rest of the pages just to make sure */ |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 964 | io_ctl_zero_remaining_pages(&io_ctl); |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 965 | |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 966 | ret = btrfs_dirty_pages(root, inode, io_ctl.pages, io_ctl.num_pages, |
| 967 | 0, i_size_read(inode), &cached_state); |
| 968 | io_ctl_drop_pages(&io_ctl); |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 969 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, 0, |
| 970 | i_size_read(inode) - 1, &cached_state, GFP_NOFS); |
| 971 | |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 972 | if (ret) |
Josef Bacik | 2f35612 | 2011-06-10 15:31:13 -0400 | [diff] [blame] | 973 | goto out; |
Josef Bacik | be1a12a | 2011-04-06 13:05:22 -0400 | [diff] [blame] | 974 | |
Josef Bacik | be1a12a | 2011-04-06 13:05:22 -0400 | [diff] [blame] | 975 | |
Josef Bacik | 549b4fd | 2011-10-05 16:33:53 -0400 | [diff] [blame] | 976 | ret = filemap_write_and_wait(inode->i_mapping); |
| 977 | if (ret) |
| 978 | goto out; |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 979 | |
| 980 | key.objectid = BTRFS_FREE_SPACE_OBJECTID; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 981 | key.offset = offset; |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 982 | key.type = 0; |
| 983 | |
Josef Bacik | a9b5fcd | 2011-08-19 12:06:12 -0400 | [diff] [blame] | 984 | ret = btrfs_search_slot(trans, root, &key, path, 0, 1); |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 985 | if (ret < 0) { |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 986 | clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, inode->i_size - 1, |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 987 | EXTENT_DIRTY | EXTENT_DELALLOC, 0, 0, NULL, |
| 988 | GFP_NOFS); |
Josef Bacik | 2f35612 | 2011-06-10 15:31:13 -0400 | [diff] [blame] | 989 | goto out; |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 990 | } |
| 991 | leaf = path->nodes[0]; |
| 992 | if (ret > 0) { |
| 993 | struct btrfs_key found_key; |
| 994 | BUG_ON(!path->slots[0]); |
| 995 | path->slots[0]--; |
| 996 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
| 997 | if (found_key.objectid != BTRFS_FREE_SPACE_OBJECTID || |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 998 | found_key.offset != offset) { |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 999 | clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, |
| 1000 | inode->i_size - 1, |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 1001 | EXTENT_DIRTY | EXTENT_DELALLOC, 0, 0, |
| 1002 | NULL, GFP_NOFS); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1003 | btrfs_release_path(path); |
Josef Bacik | 2f35612 | 2011-06-10 15:31:13 -0400 | [diff] [blame] | 1004 | goto out; |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1005 | } |
| 1006 | } |
Josef Bacik | 549b4fd | 2011-10-05 16:33:53 -0400 | [diff] [blame] | 1007 | |
| 1008 | BTRFS_I(inode)->generation = trans->transid; |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1009 | header = btrfs_item_ptr(leaf, path->slots[0], |
| 1010 | struct btrfs_free_space_header); |
| 1011 | btrfs_set_free_space_entries(leaf, header, entries); |
| 1012 | btrfs_set_free_space_bitmaps(leaf, header, bitmaps); |
| 1013 | btrfs_set_free_space_generation(leaf, header, trans->transid); |
| 1014 | btrfs_mark_buffer_dirty(leaf); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1015 | btrfs_release_path(path); |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1016 | |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 1017 | err = 0; |
Josef Bacik | 2f35612 | 2011-06-10 15:31:13 -0400 | [diff] [blame] | 1018 | out: |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 1019 | io_ctl_free(&io_ctl); |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 1020 | if (err) { |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 1021 | invalidate_inode_pages2(inode->i_mapping); |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1022 | BTRFS_I(inode)->generation = 0; |
| 1023 | } |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1024 | btrfs_update_inode(trans, root, inode); |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 1025 | return err; |
Josef Bacik | a67509c | 2011-10-05 15:18:58 -0400 | [diff] [blame] | 1026 | |
| 1027 | out_nospc: |
| 1028 | list_for_each_safe(pos, n, &bitmap_list) { |
| 1029 | struct btrfs_free_space *entry = |
| 1030 | list_entry(pos, struct btrfs_free_space, list); |
| 1031 | list_del_init(&entry->list); |
| 1032 | } |
| 1033 | io_ctl_drop_pages(&io_ctl); |
| 1034 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, 0, |
| 1035 | i_size_read(inode) - 1, &cached_state, GFP_NOFS); |
| 1036 | goto out; |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 1037 | } |
| 1038 | |
| 1039 | int btrfs_write_out_cache(struct btrfs_root *root, |
| 1040 | struct btrfs_trans_handle *trans, |
| 1041 | struct btrfs_block_group_cache *block_group, |
| 1042 | struct btrfs_path *path) |
| 1043 | { |
| 1044 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
| 1045 | struct inode *inode; |
| 1046 | int ret = 0; |
| 1047 | |
| 1048 | root = root->fs_info->tree_root; |
| 1049 | |
| 1050 | spin_lock(&block_group->lock); |
| 1051 | if (block_group->disk_cache_state < BTRFS_DC_SETUP) { |
| 1052 | spin_unlock(&block_group->lock); |
| 1053 | return 0; |
| 1054 | } |
| 1055 | spin_unlock(&block_group->lock); |
| 1056 | |
| 1057 | inode = lookup_free_space_inode(root, block_group, path); |
| 1058 | if (IS_ERR(inode)) |
| 1059 | return 0; |
| 1060 | |
| 1061 | ret = __btrfs_write_out_cache(root, inode, ctl, block_group, trans, |
| 1062 | path, block_group->key.objectid); |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 1063 | if (ret) { |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 1064 | spin_lock(&block_group->lock); |
| 1065 | block_group->disk_cache_state = BTRFS_DC_ERROR; |
| 1066 | spin_unlock(&block_group->lock); |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 1067 | ret = 0; |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 1068 | #ifdef DEBUG |
Masanari Iida | 934e7d4 | 2012-02-07 22:21:45 +0900 | [diff] [blame] | 1069 | printk(KERN_ERR "btrfs: failed to write free space cache " |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 1070 | "for block group %llu\n", block_group->key.objectid); |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 1071 | #endif |
Li Zefan | 0414efa | 2011-04-20 10:20:14 +0800 | [diff] [blame] | 1072 | } |
| 1073 | |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1074 | iput(inode); |
| 1075 | return ret; |
| 1076 | } |
| 1077 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1078 | static inline unsigned long offset_to_bit(u64 bitmap_start, u32 unit, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1079 | u64 offset) |
| 1080 | { |
| 1081 | BUG_ON(offset < bitmap_start); |
| 1082 | offset -= bitmap_start; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1083 | return (unsigned long)(div_u64(offset, unit)); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1084 | } |
| 1085 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1086 | static inline unsigned long bytes_to_bits(u64 bytes, u32 unit) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1087 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1088 | return (unsigned long)(div_u64(bytes, unit)); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1089 | } |
| 1090 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1091 | static inline u64 offset_to_bitmap(struct btrfs_free_space_ctl *ctl, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1092 | u64 offset) |
| 1093 | { |
| 1094 | u64 bitmap_start; |
| 1095 | u64 bytes_per_bitmap; |
| 1096 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1097 | bytes_per_bitmap = BITS_PER_BITMAP * ctl->unit; |
| 1098 | bitmap_start = offset - ctl->start; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1099 | bitmap_start = div64_u64(bitmap_start, bytes_per_bitmap); |
| 1100 | bitmap_start *= bytes_per_bitmap; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1101 | bitmap_start += ctl->start; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1102 | |
| 1103 | return bitmap_start; |
| 1104 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1105 | |
| 1106 | static int tree_insert_offset(struct rb_root *root, u64 offset, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1107 | struct rb_node *node, int bitmap) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1108 | { |
| 1109 | struct rb_node **p = &root->rb_node; |
| 1110 | struct rb_node *parent = NULL; |
| 1111 | struct btrfs_free_space *info; |
| 1112 | |
| 1113 | while (*p) { |
| 1114 | parent = *p; |
| 1115 | info = rb_entry(parent, struct btrfs_free_space, offset_index); |
| 1116 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1117 | if (offset < info->offset) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1118 | p = &(*p)->rb_left; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1119 | } else if (offset > info->offset) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1120 | p = &(*p)->rb_right; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1121 | } else { |
| 1122 | /* |
| 1123 | * we could have a bitmap entry and an extent entry |
| 1124 | * share the same offset. If this is the case, we want |
| 1125 | * the extent entry to always be found first if we do a |
| 1126 | * linear search through the tree, since we want to have |
| 1127 | * the quickest allocation time, and allocating from an |
| 1128 | * extent is faster than allocating from a bitmap. So |
| 1129 | * if we're inserting a bitmap and we find an entry at |
| 1130 | * this offset, we want to go right, or after this entry |
| 1131 | * logically. If we are inserting an extent and we've |
| 1132 | * found a bitmap, we want to go left, or before |
| 1133 | * logically. |
| 1134 | */ |
| 1135 | if (bitmap) { |
Josef Bacik | 207dde8 | 2011-05-13 14:49:23 -0400 | [diff] [blame] | 1136 | if (info->bitmap) { |
| 1137 | WARN_ON_ONCE(1); |
| 1138 | return -EEXIST; |
| 1139 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1140 | p = &(*p)->rb_right; |
| 1141 | } else { |
Josef Bacik | 207dde8 | 2011-05-13 14:49:23 -0400 | [diff] [blame] | 1142 | if (!info->bitmap) { |
| 1143 | WARN_ON_ONCE(1); |
| 1144 | return -EEXIST; |
| 1145 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1146 | p = &(*p)->rb_left; |
| 1147 | } |
| 1148 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1149 | } |
| 1150 | |
| 1151 | rb_link_node(node, parent, p); |
| 1152 | rb_insert_color(node, root); |
| 1153 | |
| 1154 | return 0; |
| 1155 | } |
| 1156 | |
| 1157 | /* |
Josef Bacik | 70cb074 | 2009-04-03 10:14:19 -0400 | [diff] [blame] | 1158 | * searches the tree for the given offset. |
| 1159 | * |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1160 | * fuzzy - If this is set, then we are trying to make an allocation, and we just |
| 1161 | * want a section that has at least bytes size and comes at or after the given |
| 1162 | * offset. |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1163 | */ |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1164 | static struct btrfs_free_space * |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1165 | tree_search_offset(struct btrfs_free_space_ctl *ctl, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1166 | u64 offset, int bitmap_only, int fuzzy) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1167 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1168 | struct rb_node *n = ctl->free_space_offset.rb_node; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1169 | struct btrfs_free_space *entry, *prev = NULL; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1170 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1171 | /* find entry that is closest to the 'offset' */ |
| 1172 | while (1) { |
| 1173 | if (!n) { |
| 1174 | entry = NULL; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1175 | break; |
| 1176 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1177 | |
| 1178 | entry = rb_entry(n, struct btrfs_free_space, offset_index); |
| 1179 | prev = entry; |
| 1180 | |
| 1181 | if (offset < entry->offset) |
| 1182 | n = n->rb_left; |
| 1183 | else if (offset > entry->offset) |
| 1184 | n = n->rb_right; |
| 1185 | else |
| 1186 | break; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1187 | } |
| 1188 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1189 | if (bitmap_only) { |
| 1190 | if (!entry) |
| 1191 | return NULL; |
| 1192 | if (entry->bitmap) |
| 1193 | return entry; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1194 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1195 | /* |
| 1196 | * bitmap entry and extent entry may share same offset, |
| 1197 | * in that case, bitmap entry comes after extent entry. |
| 1198 | */ |
| 1199 | n = rb_next(n); |
| 1200 | if (!n) |
| 1201 | return NULL; |
| 1202 | entry = rb_entry(n, struct btrfs_free_space, offset_index); |
| 1203 | if (entry->offset != offset) |
| 1204 | return NULL; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1205 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1206 | WARN_ON(!entry->bitmap); |
| 1207 | return entry; |
| 1208 | } else if (entry) { |
| 1209 | if (entry->bitmap) { |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1210 | /* |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1211 | * if previous extent entry covers the offset, |
| 1212 | * we should return it instead of the bitmap entry |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1213 | */ |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1214 | n = &entry->offset_index; |
| 1215 | while (1) { |
| 1216 | n = rb_prev(n); |
| 1217 | if (!n) |
| 1218 | break; |
| 1219 | prev = rb_entry(n, struct btrfs_free_space, |
| 1220 | offset_index); |
| 1221 | if (!prev->bitmap) { |
| 1222 | if (prev->offset + prev->bytes > offset) |
| 1223 | entry = prev; |
| 1224 | break; |
| 1225 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1226 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1227 | } |
| 1228 | return entry; |
| 1229 | } |
| 1230 | |
| 1231 | if (!prev) |
| 1232 | return NULL; |
| 1233 | |
| 1234 | /* find last entry before the 'offset' */ |
| 1235 | entry = prev; |
| 1236 | if (entry->offset > offset) { |
| 1237 | n = rb_prev(&entry->offset_index); |
| 1238 | if (n) { |
| 1239 | entry = rb_entry(n, struct btrfs_free_space, |
| 1240 | offset_index); |
| 1241 | BUG_ON(entry->offset > offset); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1242 | } else { |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1243 | if (fuzzy) |
| 1244 | return entry; |
| 1245 | else |
| 1246 | return NULL; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1247 | } |
| 1248 | } |
| 1249 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1250 | if (entry->bitmap) { |
| 1251 | n = &entry->offset_index; |
| 1252 | while (1) { |
| 1253 | n = rb_prev(n); |
| 1254 | if (!n) |
| 1255 | break; |
| 1256 | prev = rb_entry(n, struct btrfs_free_space, |
| 1257 | offset_index); |
| 1258 | if (!prev->bitmap) { |
| 1259 | if (prev->offset + prev->bytes > offset) |
| 1260 | return prev; |
| 1261 | break; |
| 1262 | } |
| 1263 | } |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1264 | if (entry->offset + BITS_PER_BITMAP * ctl->unit > offset) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1265 | return entry; |
| 1266 | } else if (entry->offset + entry->bytes > offset) |
| 1267 | return entry; |
| 1268 | |
| 1269 | if (!fuzzy) |
| 1270 | return NULL; |
| 1271 | |
| 1272 | while (1) { |
| 1273 | if (entry->bitmap) { |
| 1274 | if (entry->offset + BITS_PER_BITMAP * |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1275 | ctl->unit > offset) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1276 | break; |
| 1277 | } else { |
| 1278 | if (entry->offset + entry->bytes > offset) |
| 1279 | break; |
| 1280 | } |
| 1281 | |
| 1282 | n = rb_next(&entry->offset_index); |
| 1283 | if (!n) |
| 1284 | return NULL; |
| 1285 | entry = rb_entry(n, struct btrfs_free_space, offset_index); |
| 1286 | } |
| 1287 | return entry; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1288 | } |
| 1289 | |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 1290 | static inline void |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1291 | __unlink_free_space(struct btrfs_free_space_ctl *ctl, |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 1292 | struct btrfs_free_space *info) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1293 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1294 | rb_erase(&info->offset_index, &ctl->free_space_offset); |
| 1295 | ctl->free_extents--; |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 1296 | } |
| 1297 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1298 | static void unlink_free_space(struct btrfs_free_space_ctl *ctl, |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 1299 | struct btrfs_free_space *info) |
| 1300 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1301 | __unlink_free_space(ctl, info); |
| 1302 | ctl->free_space -= info->bytes; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1303 | } |
| 1304 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1305 | static int link_free_space(struct btrfs_free_space_ctl *ctl, |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1306 | struct btrfs_free_space *info) |
| 1307 | { |
| 1308 | int ret = 0; |
| 1309 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1310 | BUG_ON(!info->bitmap && !info->bytes); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1311 | ret = tree_insert_offset(&ctl->free_space_offset, info->offset, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1312 | &info->offset_index, (info->bitmap != NULL)); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1313 | if (ret) |
| 1314 | return ret; |
| 1315 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1316 | ctl->free_space += info->bytes; |
| 1317 | ctl->free_extents++; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1318 | return ret; |
| 1319 | } |
| 1320 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1321 | static void recalculate_thresholds(struct btrfs_free_space_ctl *ctl) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1322 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1323 | struct btrfs_block_group_cache *block_group = ctl->private; |
Josef Bacik | 25891f7 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 1324 | u64 max_bytes; |
| 1325 | u64 bitmap_bytes; |
| 1326 | u64 extent_bytes; |
Li Zefan | 8eb2d82 | 2010-11-09 14:48:01 +0800 | [diff] [blame] | 1327 | u64 size = block_group->key.offset; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1328 | u64 bytes_per_bg = BITS_PER_BITMAP * block_group->sectorsize; |
| 1329 | int max_bitmaps = div64_u64(size + bytes_per_bg - 1, bytes_per_bg); |
| 1330 | |
| 1331 | BUG_ON(ctl->total_bitmaps > max_bitmaps); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1332 | |
| 1333 | /* |
| 1334 | * The goal is to keep the total amount of memory used per 1gb of space |
| 1335 | * at or below 32k, so we need to adjust how much memory we allow to be |
| 1336 | * used by extent based free space tracking |
| 1337 | */ |
Li Zefan | 8eb2d82 | 2010-11-09 14:48:01 +0800 | [diff] [blame] | 1338 | if (size < 1024 * 1024 * 1024) |
| 1339 | max_bytes = MAX_CACHE_BYTES_PER_GIG; |
| 1340 | else |
| 1341 | max_bytes = MAX_CACHE_BYTES_PER_GIG * |
| 1342 | div64_u64(size, 1024 * 1024 * 1024); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1343 | |
Josef Bacik | 25891f7 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 1344 | /* |
| 1345 | * we want to account for 1 more bitmap than what we have so we can make |
| 1346 | * sure we don't go over our overall goal of MAX_CACHE_BYTES_PER_GIG as |
| 1347 | * we add more bitmaps. |
| 1348 | */ |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1349 | bitmap_bytes = (ctl->total_bitmaps + 1) * PAGE_CACHE_SIZE; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1350 | |
Josef Bacik | 25891f7 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 1351 | if (bitmap_bytes >= max_bytes) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1352 | ctl->extents_thresh = 0; |
Josef Bacik | 25891f7 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 1353 | return; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1354 | } |
Josef Bacik | 25891f7 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 1355 | |
| 1356 | /* |
| 1357 | * we want the extent entry threshold to always be at most 1/2 the maxw |
| 1358 | * bytes we can have, or whatever is less than that. |
| 1359 | */ |
| 1360 | extent_bytes = max_bytes - bitmap_bytes; |
| 1361 | extent_bytes = min_t(u64, extent_bytes, div64_u64(max_bytes, 2)); |
| 1362 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1363 | ctl->extents_thresh = |
Josef Bacik | 25891f7 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 1364 | div64_u64(extent_bytes, (sizeof(struct btrfs_free_space))); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1365 | } |
| 1366 | |
Miao Xie | bb3ac5a | 2011-08-05 09:32:35 +0000 | [diff] [blame] | 1367 | static inline void __bitmap_clear_bits(struct btrfs_free_space_ctl *ctl, |
| 1368 | struct btrfs_free_space *info, |
| 1369 | u64 offset, u64 bytes) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1370 | { |
Li Zefan | f38b6e7 | 2011-03-14 13:40:51 +0800 | [diff] [blame] | 1371 | unsigned long start, count; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1372 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1373 | start = offset_to_bit(info->offset, ctl->unit, offset); |
| 1374 | count = bytes_to_bits(bytes, ctl->unit); |
Li Zefan | f38b6e7 | 2011-03-14 13:40:51 +0800 | [diff] [blame] | 1375 | BUG_ON(start + count > BITS_PER_BITMAP); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1376 | |
Li Zefan | f38b6e7 | 2011-03-14 13:40:51 +0800 | [diff] [blame] | 1377 | bitmap_clear(info->bitmap, start, count); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1378 | |
| 1379 | info->bytes -= bytes; |
Miao Xie | bb3ac5a | 2011-08-05 09:32:35 +0000 | [diff] [blame] | 1380 | } |
| 1381 | |
| 1382 | static void bitmap_clear_bits(struct btrfs_free_space_ctl *ctl, |
| 1383 | struct btrfs_free_space *info, u64 offset, |
| 1384 | u64 bytes) |
| 1385 | { |
| 1386 | __bitmap_clear_bits(ctl, info, offset, bytes); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1387 | ctl->free_space -= bytes; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1388 | } |
| 1389 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1390 | static void bitmap_set_bits(struct btrfs_free_space_ctl *ctl, |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1391 | struct btrfs_free_space *info, u64 offset, |
| 1392 | u64 bytes) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1393 | { |
Li Zefan | f38b6e7 | 2011-03-14 13:40:51 +0800 | [diff] [blame] | 1394 | unsigned long start, count; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1395 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1396 | start = offset_to_bit(info->offset, ctl->unit, offset); |
| 1397 | count = bytes_to_bits(bytes, ctl->unit); |
Li Zefan | f38b6e7 | 2011-03-14 13:40:51 +0800 | [diff] [blame] | 1398 | BUG_ON(start + count > BITS_PER_BITMAP); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1399 | |
Li Zefan | f38b6e7 | 2011-03-14 13:40:51 +0800 | [diff] [blame] | 1400 | bitmap_set(info->bitmap, start, count); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1401 | |
| 1402 | info->bytes += bytes; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1403 | ctl->free_space += bytes; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1404 | } |
| 1405 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1406 | static int search_bitmap(struct btrfs_free_space_ctl *ctl, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1407 | struct btrfs_free_space *bitmap_info, u64 *offset, |
| 1408 | u64 *bytes) |
| 1409 | { |
| 1410 | unsigned long found_bits = 0; |
| 1411 | unsigned long bits, i; |
| 1412 | unsigned long next_zero; |
| 1413 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1414 | i = offset_to_bit(bitmap_info->offset, ctl->unit, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1415 | max_t(u64, *offset, bitmap_info->offset)); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1416 | bits = bytes_to_bits(*bytes, ctl->unit); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1417 | |
| 1418 | for (i = find_next_bit(bitmap_info->bitmap, BITS_PER_BITMAP, i); |
| 1419 | i < BITS_PER_BITMAP; |
| 1420 | i = find_next_bit(bitmap_info->bitmap, BITS_PER_BITMAP, i + 1)) { |
| 1421 | next_zero = find_next_zero_bit(bitmap_info->bitmap, |
| 1422 | BITS_PER_BITMAP, i); |
| 1423 | if ((next_zero - i) >= bits) { |
| 1424 | found_bits = next_zero - i; |
| 1425 | break; |
| 1426 | } |
| 1427 | i = next_zero; |
| 1428 | } |
| 1429 | |
| 1430 | if (found_bits) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1431 | *offset = (u64)(i * ctl->unit) + bitmap_info->offset; |
| 1432 | *bytes = (u64)(found_bits) * ctl->unit; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1433 | return 0; |
| 1434 | } |
| 1435 | |
| 1436 | return -1; |
| 1437 | } |
| 1438 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1439 | static struct btrfs_free_space * |
| 1440 | find_free_space(struct btrfs_free_space_ctl *ctl, u64 *offset, u64 *bytes) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1441 | { |
| 1442 | struct btrfs_free_space *entry; |
| 1443 | struct rb_node *node; |
| 1444 | int ret; |
| 1445 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1446 | if (!ctl->free_space_offset.rb_node) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1447 | return NULL; |
| 1448 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1449 | entry = tree_search_offset(ctl, offset_to_bitmap(ctl, *offset), 0, 1); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1450 | if (!entry) |
| 1451 | return NULL; |
| 1452 | |
| 1453 | for (node = &entry->offset_index; node; node = rb_next(node)) { |
| 1454 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
| 1455 | if (entry->bytes < *bytes) |
| 1456 | continue; |
| 1457 | |
| 1458 | if (entry->bitmap) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1459 | ret = search_bitmap(ctl, entry, offset, bytes); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1460 | if (!ret) |
| 1461 | return entry; |
| 1462 | continue; |
| 1463 | } |
| 1464 | |
| 1465 | *offset = entry->offset; |
| 1466 | *bytes = entry->bytes; |
| 1467 | return entry; |
| 1468 | } |
| 1469 | |
| 1470 | return NULL; |
| 1471 | } |
| 1472 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1473 | static void add_new_bitmap(struct btrfs_free_space_ctl *ctl, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1474 | struct btrfs_free_space *info, u64 offset) |
| 1475 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1476 | info->offset = offset_to_bitmap(ctl, offset); |
Josef Bacik | f019f42 | 2009-09-11 16:11:20 -0400 | [diff] [blame] | 1477 | info->bytes = 0; |
Alexandre Oliva | f2d0f67 | 2011-11-28 12:04:43 -0200 | [diff] [blame] | 1478 | INIT_LIST_HEAD(&info->list); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1479 | link_free_space(ctl, info); |
| 1480 | ctl->total_bitmaps++; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1481 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1482 | ctl->op->recalc_thresholds(ctl); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1483 | } |
| 1484 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1485 | static void free_bitmap(struct btrfs_free_space_ctl *ctl, |
Li Zefan | edf6e2d | 2010-11-09 14:50:07 +0800 | [diff] [blame] | 1486 | struct btrfs_free_space *bitmap_info) |
| 1487 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1488 | unlink_free_space(ctl, bitmap_info); |
Li Zefan | edf6e2d | 2010-11-09 14:50:07 +0800 | [diff] [blame] | 1489 | kfree(bitmap_info->bitmap); |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 1490 | kmem_cache_free(btrfs_free_space_cachep, bitmap_info); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1491 | ctl->total_bitmaps--; |
| 1492 | ctl->op->recalc_thresholds(ctl); |
Li Zefan | edf6e2d | 2010-11-09 14:50:07 +0800 | [diff] [blame] | 1493 | } |
| 1494 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1495 | static noinline int remove_from_bitmap(struct btrfs_free_space_ctl *ctl, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1496 | struct btrfs_free_space *bitmap_info, |
| 1497 | u64 *offset, u64 *bytes) |
| 1498 | { |
| 1499 | u64 end; |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1500 | u64 search_start, search_bytes; |
| 1501 | int ret; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1502 | |
| 1503 | again: |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1504 | end = bitmap_info->offset + (u64)(BITS_PER_BITMAP * ctl->unit) - 1; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1505 | |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1506 | /* |
| 1507 | * XXX - this can go away after a few releases. |
| 1508 | * |
| 1509 | * since the only user of btrfs_remove_free_space is the tree logging |
| 1510 | * stuff, and the only way to test that is under crash conditions, we |
| 1511 | * want to have this debug stuff here just in case somethings not |
| 1512 | * working. Search the bitmap for the space we are trying to use to |
| 1513 | * make sure its actually there. If its not there then we need to stop |
| 1514 | * because something has gone wrong. |
| 1515 | */ |
| 1516 | search_start = *offset; |
| 1517 | search_bytes = *bytes; |
Josef Bacik | 13dbc08 | 2011-02-03 02:39:52 +0000 | [diff] [blame] | 1518 | search_bytes = min(search_bytes, end - search_start + 1); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1519 | ret = search_bitmap(ctl, bitmap_info, &search_start, &search_bytes); |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1520 | BUG_ON(ret < 0 || search_start != *offset); |
| 1521 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1522 | if (*offset > bitmap_info->offset && *offset + *bytes > end) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1523 | bitmap_clear_bits(ctl, bitmap_info, *offset, end - *offset + 1); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1524 | *bytes -= end - *offset + 1; |
| 1525 | *offset = end + 1; |
| 1526 | } else if (*offset >= bitmap_info->offset && *offset + *bytes <= end) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1527 | bitmap_clear_bits(ctl, bitmap_info, *offset, *bytes); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1528 | *bytes = 0; |
| 1529 | } |
| 1530 | |
| 1531 | if (*bytes) { |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1532 | struct rb_node *next = rb_next(&bitmap_info->offset_index); |
Li Zefan | edf6e2d | 2010-11-09 14:50:07 +0800 | [diff] [blame] | 1533 | if (!bitmap_info->bytes) |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1534 | free_bitmap(ctl, bitmap_info); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1535 | |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1536 | /* |
| 1537 | * no entry after this bitmap, but we still have bytes to |
| 1538 | * remove, so something has gone wrong. |
| 1539 | */ |
| 1540 | if (!next) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1541 | return -EINVAL; |
| 1542 | |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1543 | bitmap_info = rb_entry(next, struct btrfs_free_space, |
| 1544 | offset_index); |
| 1545 | |
| 1546 | /* |
| 1547 | * if the next entry isn't a bitmap we need to return to let the |
| 1548 | * extent stuff do its work. |
| 1549 | */ |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1550 | if (!bitmap_info->bitmap) |
| 1551 | return -EAGAIN; |
| 1552 | |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1553 | /* |
| 1554 | * Ok the next item is a bitmap, but it may not actually hold |
| 1555 | * the information for the rest of this free space stuff, so |
| 1556 | * look for it, and if we don't find it return so we can try |
| 1557 | * everything over again. |
| 1558 | */ |
| 1559 | search_start = *offset; |
| 1560 | search_bytes = *bytes; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1561 | ret = search_bitmap(ctl, bitmap_info, &search_start, |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1562 | &search_bytes); |
| 1563 | if (ret < 0 || search_start != *offset) |
| 1564 | return -EAGAIN; |
| 1565 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1566 | goto again; |
Li Zefan | edf6e2d | 2010-11-09 14:50:07 +0800 | [diff] [blame] | 1567 | } else if (!bitmap_info->bytes) |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1568 | free_bitmap(ctl, bitmap_info); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1569 | |
| 1570 | return 0; |
| 1571 | } |
| 1572 | |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 1573 | static u64 add_bytes_to_bitmap(struct btrfs_free_space_ctl *ctl, |
| 1574 | struct btrfs_free_space *info, u64 offset, |
| 1575 | u64 bytes) |
| 1576 | { |
| 1577 | u64 bytes_to_set = 0; |
| 1578 | u64 end; |
| 1579 | |
| 1580 | end = info->offset + (u64)(BITS_PER_BITMAP * ctl->unit); |
| 1581 | |
| 1582 | bytes_to_set = min(end - offset, bytes); |
| 1583 | |
| 1584 | bitmap_set_bits(ctl, info, offset, bytes_to_set); |
| 1585 | |
| 1586 | return bytes_to_set; |
| 1587 | |
| 1588 | } |
| 1589 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1590 | static bool use_bitmap(struct btrfs_free_space_ctl *ctl, |
| 1591 | struct btrfs_free_space *info) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1592 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1593 | struct btrfs_block_group_cache *block_group = ctl->private; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1594 | |
| 1595 | /* |
| 1596 | * If we are below the extents threshold then we can add this as an |
| 1597 | * extent, and don't have to deal with the bitmap |
| 1598 | */ |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1599 | if (ctl->free_extents < ctl->extents_thresh) { |
Josef Bacik | 32cb084 | 2011-03-18 16:16:21 -0400 | [diff] [blame] | 1600 | /* |
| 1601 | * If this block group has some small extents we don't want to |
| 1602 | * use up all of our free slots in the cache with them, we want |
| 1603 | * to reserve them to larger extents, however if we have plent |
| 1604 | * of cache left then go ahead an dadd them, no sense in adding |
| 1605 | * the overhead of a bitmap if we don't have to. |
| 1606 | */ |
| 1607 | if (info->bytes <= block_group->sectorsize * 4) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1608 | if (ctl->free_extents * 2 <= ctl->extents_thresh) |
| 1609 | return false; |
Josef Bacik | 32cb084 | 2011-03-18 16:16:21 -0400 | [diff] [blame] | 1610 | } else { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1611 | return false; |
Josef Bacik | 32cb084 | 2011-03-18 16:16:21 -0400 | [diff] [blame] | 1612 | } |
| 1613 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1614 | |
| 1615 | /* |
| 1616 | * some block groups are so tiny they can't be enveloped by a bitmap, so |
| 1617 | * don't even bother to create a bitmap for this |
| 1618 | */ |
| 1619 | if (BITS_PER_BITMAP * block_group->sectorsize > |
| 1620 | block_group->key.offset) |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1621 | return false; |
| 1622 | |
| 1623 | return true; |
| 1624 | } |
| 1625 | |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 1626 | static struct btrfs_free_space_op free_space_op = { |
| 1627 | .recalc_thresholds = recalculate_thresholds, |
| 1628 | .use_bitmap = use_bitmap, |
| 1629 | }; |
| 1630 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1631 | static int insert_into_bitmap(struct btrfs_free_space_ctl *ctl, |
| 1632 | struct btrfs_free_space *info) |
| 1633 | { |
| 1634 | struct btrfs_free_space *bitmap_info; |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 1635 | struct btrfs_block_group_cache *block_group = NULL; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1636 | int added = 0; |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 1637 | u64 bytes, offset, bytes_added; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1638 | int ret; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1639 | |
| 1640 | bytes = info->bytes; |
| 1641 | offset = info->offset; |
| 1642 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1643 | if (!ctl->op->use_bitmap(ctl, info)) |
| 1644 | return 0; |
| 1645 | |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 1646 | if (ctl->op == &free_space_op) |
| 1647 | block_group = ctl->private; |
Chris Mason | 38e8788 | 2011-06-10 16:36:57 -0400 | [diff] [blame] | 1648 | again: |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 1649 | /* |
| 1650 | * Since we link bitmaps right into the cluster we need to see if we |
| 1651 | * have a cluster here, and if so and it has our bitmap we need to add |
| 1652 | * the free space to that bitmap. |
| 1653 | */ |
| 1654 | if (block_group && !list_empty(&block_group->cluster_list)) { |
| 1655 | struct btrfs_free_cluster *cluster; |
| 1656 | struct rb_node *node; |
| 1657 | struct btrfs_free_space *entry; |
| 1658 | |
| 1659 | cluster = list_entry(block_group->cluster_list.next, |
| 1660 | struct btrfs_free_cluster, |
| 1661 | block_group_list); |
| 1662 | spin_lock(&cluster->lock); |
| 1663 | node = rb_first(&cluster->root); |
| 1664 | if (!node) { |
| 1665 | spin_unlock(&cluster->lock); |
Chris Mason | 38e8788 | 2011-06-10 16:36:57 -0400 | [diff] [blame] | 1666 | goto no_cluster_bitmap; |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 1667 | } |
| 1668 | |
| 1669 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
| 1670 | if (!entry->bitmap) { |
| 1671 | spin_unlock(&cluster->lock); |
Chris Mason | 38e8788 | 2011-06-10 16:36:57 -0400 | [diff] [blame] | 1672 | goto no_cluster_bitmap; |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 1673 | } |
| 1674 | |
| 1675 | if (entry->offset == offset_to_bitmap(ctl, offset)) { |
| 1676 | bytes_added = add_bytes_to_bitmap(ctl, entry, |
| 1677 | offset, bytes); |
| 1678 | bytes -= bytes_added; |
| 1679 | offset += bytes_added; |
| 1680 | } |
| 1681 | spin_unlock(&cluster->lock); |
| 1682 | if (!bytes) { |
| 1683 | ret = 1; |
| 1684 | goto out; |
| 1685 | } |
| 1686 | } |
Chris Mason | 38e8788 | 2011-06-10 16:36:57 -0400 | [diff] [blame] | 1687 | |
| 1688 | no_cluster_bitmap: |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1689 | bitmap_info = tree_search_offset(ctl, offset_to_bitmap(ctl, offset), |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1690 | 1, 0); |
| 1691 | if (!bitmap_info) { |
| 1692 | BUG_ON(added); |
| 1693 | goto new_bitmap; |
| 1694 | } |
| 1695 | |
Josef Bacik | 2cdc342 | 2011-05-27 14:07:49 -0400 | [diff] [blame] | 1696 | bytes_added = add_bytes_to_bitmap(ctl, bitmap_info, offset, bytes); |
| 1697 | bytes -= bytes_added; |
| 1698 | offset += bytes_added; |
| 1699 | added = 0; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1700 | |
| 1701 | if (!bytes) { |
| 1702 | ret = 1; |
| 1703 | goto out; |
| 1704 | } else |
| 1705 | goto again; |
| 1706 | |
| 1707 | new_bitmap: |
| 1708 | if (info && info->bitmap) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1709 | add_new_bitmap(ctl, info, offset); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1710 | added = 1; |
| 1711 | info = NULL; |
| 1712 | goto again; |
| 1713 | } else { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1714 | spin_unlock(&ctl->tree_lock); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1715 | |
| 1716 | /* no pre-allocated info, allocate a new one */ |
| 1717 | if (!info) { |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 1718 | info = kmem_cache_zalloc(btrfs_free_space_cachep, |
| 1719 | GFP_NOFS); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1720 | if (!info) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1721 | spin_lock(&ctl->tree_lock); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1722 | ret = -ENOMEM; |
| 1723 | goto out; |
| 1724 | } |
| 1725 | } |
| 1726 | |
| 1727 | /* allocate the bitmap */ |
| 1728 | info->bitmap = kzalloc(PAGE_CACHE_SIZE, GFP_NOFS); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1729 | spin_lock(&ctl->tree_lock); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1730 | if (!info->bitmap) { |
| 1731 | ret = -ENOMEM; |
| 1732 | goto out; |
| 1733 | } |
| 1734 | goto again; |
| 1735 | } |
| 1736 | |
| 1737 | out: |
| 1738 | if (info) { |
| 1739 | if (info->bitmap) |
| 1740 | kfree(info->bitmap); |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 1741 | kmem_cache_free(btrfs_free_space_cachep, info); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1742 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1743 | |
| 1744 | return ret; |
| 1745 | } |
| 1746 | |
Chris Mason | 945d896 | 2011-05-22 12:33:42 -0400 | [diff] [blame] | 1747 | static bool try_merge_free_space(struct btrfs_free_space_ctl *ctl, |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 1748 | struct btrfs_free_space *info, bool update_stat) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1749 | { |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 1750 | struct btrfs_free_space *left_info; |
| 1751 | struct btrfs_free_space *right_info; |
| 1752 | bool merged = false; |
| 1753 | u64 offset = info->offset; |
| 1754 | u64 bytes = info->bytes; |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 1755 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1756 | /* |
| 1757 | * first we want to see if there is free space adjacent to the range we |
| 1758 | * are adding, if there is remove that struct and add a new one to |
| 1759 | * cover the entire range |
| 1760 | */ |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1761 | right_info = tree_search_offset(ctl, offset + bytes, 0, 0); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1762 | if (right_info && rb_prev(&right_info->offset_index)) |
| 1763 | left_info = rb_entry(rb_prev(&right_info->offset_index), |
| 1764 | struct btrfs_free_space, offset_index); |
| 1765 | else |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1766 | left_info = tree_search_offset(ctl, offset - 1, 0, 0); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1767 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1768 | if (right_info && !right_info->bitmap) { |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 1769 | if (update_stat) |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1770 | unlink_free_space(ctl, right_info); |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 1771 | else |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1772 | __unlink_free_space(ctl, right_info); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 1773 | info->bytes += right_info->bytes; |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 1774 | kmem_cache_free(btrfs_free_space_cachep, right_info); |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 1775 | merged = true; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1776 | } |
| 1777 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1778 | if (left_info && !left_info->bitmap && |
| 1779 | left_info->offset + left_info->bytes == offset) { |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 1780 | if (update_stat) |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1781 | unlink_free_space(ctl, left_info); |
Li Zefan | f333adb | 2010-11-09 14:57:39 +0800 | [diff] [blame] | 1782 | else |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1783 | __unlink_free_space(ctl, left_info); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 1784 | info->offset = left_info->offset; |
| 1785 | info->bytes += left_info->bytes; |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 1786 | kmem_cache_free(btrfs_free_space_cachep, left_info); |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 1787 | merged = true; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1788 | } |
| 1789 | |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 1790 | return merged; |
| 1791 | } |
| 1792 | |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 1793 | int __btrfs_add_free_space(struct btrfs_free_space_ctl *ctl, |
| 1794 | u64 offset, u64 bytes) |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 1795 | { |
| 1796 | struct btrfs_free_space *info; |
| 1797 | int ret = 0; |
| 1798 | |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 1799 | info = kmem_cache_zalloc(btrfs_free_space_cachep, GFP_NOFS); |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 1800 | if (!info) |
| 1801 | return -ENOMEM; |
| 1802 | |
| 1803 | info->offset = offset; |
| 1804 | info->bytes = bytes; |
| 1805 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1806 | spin_lock(&ctl->tree_lock); |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 1807 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1808 | if (try_merge_free_space(ctl, info, true)) |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 1809 | goto link; |
| 1810 | |
| 1811 | /* |
| 1812 | * There was no extent directly to the left or right of this new |
| 1813 | * extent then we know we're going to have to allocate a new extent, so |
| 1814 | * before we do that see if we need to drop this into a bitmap |
| 1815 | */ |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1816 | ret = insert_into_bitmap(ctl, info); |
Li Zefan | 120d66e | 2010-11-09 14:56:50 +0800 | [diff] [blame] | 1817 | if (ret < 0) { |
| 1818 | goto out; |
| 1819 | } else if (ret) { |
| 1820 | ret = 0; |
| 1821 | goto out; |
| 1822 | } |
| 1823 | link: |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1824 | ret = link_free_space(ctl, info); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1825 | if (ret) |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 1826 | kmem_cache_free(btrfs_free_space_cachep, info); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1827 | out: |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1828 | spin_unlock(&ctl->tree_lock); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 1829 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1830 | if (ret) { |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1831 | printk(KERN_CRIT "btrfs: unable to add free space :%d\n", ret); |
Stoyan Gaydarov | c293498 | 2009-04-02 17:05:11 -0400 | [diff] [blame] | 1832 | BUG_ON(ret == -EEXIST); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1833 | } |
| 1834 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1835 | return ret; |
| 1836 | } |
| 1837 | |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 1838 | int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group, |
| 1839 | u64 offset, u64 bytes) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1840 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1841 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1842 | struct btrfs_free_space *info; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1843 | struct btrfs_free_space *next_info = NULL; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1844 | int ret = 0; |
| 1845 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1846 | spin_lock(&ctl->tree_lock); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 1847 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1848 | again: |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1849 | info = tree_search_offset(ctl, offset, 0, 0); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1850 | if (!info) { |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1851 | /* |
| 1852 | * oops didn't find an extent that matched the space we wanted |
| 1853 | * to remove, look for a bitmap instead |
| 1854 | */ |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1855 | info = tree_search_offset(ctl, offset_to_bitmap(ctl, offset), |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1856 | 1, 0); |
| 1857 | if (!info) { |
Chris Mason | 24a7031 | 2011-11-21 09:39:11 -0500 | [diff] [blame] | 1858 | /* the tree logging code might be calling us before we |
| 1859 | * have fully loaded the free space rbtree for this |
| 1860 | * block group. So it is possible the entry won't |
| 1861 | * be in the rbtree yet at all. The caching code |
| 1862 | * will make sure not to put it in the rbtree if |
| 1863 | * the logging code has pinned it. |
| 1864 | */ |
Josef Bacik | 6606bb9 | 2009-07-31 11:03:58 -0400 | [diff] [blame] | 1865 | goto out_lock; |
| 1866 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1867 | } |
| 1868 | |
| 1869 | if (info->bytes < bytes && rb_next(&info->offset_index)) { |
| 1870 | u64 end; |
| 1871 | next_info = rb_entry(rb_next(&info->offset_index), |
| 1872 | struct btrfs_free_space, |
| 1873 | offset_index); |
| 1874 | |
| 1875 | if (next_info->bitmap) |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1876 | end = next_info->offset + |
| 1877 | BITS_PER_BITMAP * ctl->unit - 1; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1878 | else |
| 1879 | end = next_info->offset + next_info->bytes; |
| 1880 | |
| 1881 | if (next_info->bytes < bytes || |
| 1882 | next_info->offset > offset || offset > end) { |
| 1883 | printk(KERN_CRIT "Found free space at %llu, size %llu," |
| 1884 | " trying to use %llu\n", |
| 1885 | (unsigned long long)info->offset, |
| 1886 | (unsigned long long)info->bytes, |
| 1887 | (unsigned long long)bytes); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1888 | WARN_ON(1); |
| 1889 | ret = -EINVAL; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1890 | goto out_lock; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1891 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1892 | |
| 1893 | info = next_info; |
| 1894 | } |
| 1895 | |
| 1896 | if (info->bytes == bytes) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1897 | unlink_free_space(ctl, info); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1898 | if (info->bitmap) { |
| 1899 | kfree(info->bitmap); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1900 | ctl->total_bitmaps--; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1901 | } |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 1902 | kmem_cache_free(btrfs_free_space_cachep, info); |
Chris Mason | 1eae31e | 2011-10-14 06:31:20 -0400 | [diff] [blame] | 1903 | ret = 0; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1904 | goto out_lock; |
| 1905 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1906 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1907 | if (!info->bitmap && info->offset == offset) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1908 | unlink_free_space(ctl, info); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1909 | info->offset += bytes; |
| 1910 | info->bytes -= bytes; |
Chris Mason | 1eae31e | 2011-10-14 06:31:20 -0400 | [diff] [blame] | 1911 | ret = link_free_space(ctl, info); |
| 1912 | WARN_ON(ret); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1913 | goto out_lock; |
| 1914 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1915 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1916 | if (!info->bitmap && info->offset <= offset && |
| 1917 | info->offset + info->bytes >= offset + bytes) { |
Chris Mason | 9b49c9b | 2008-09-24 11:23:25 -0400 | [diff] [blame] | 1918 | u64 old_start = info->offset; |
| 1919 | /* |
| 1920 | * we're freeing space in the middle of the info, |
| 1921 | * this can happen during tree log replay |
| 1922 | * |
| 1923 | * first unlink the old info and then |
| 1924 | * insert it again after the hole we're creating |
| 1925 | */ |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1926 | unlink_free_space(ctl, info); |
Chris Mason | 9b49c9b | 2008-09-24 11:23:25 -0400 | [diff] [blame] | 1927 | if (offset + bytes < info->offset + info->bytes) { |
| 1928 | u64 old_end = info->offset + info->bytes; |
| 1929 | |
| 1930 | info->offset = offset + bytes; |
| 1931 | info->bytes = old_end - info->offset; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1932 | ret = link_free_space(ctl, info); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1933 | WARN_ON(ret); |
| 1934 | if (ret) |
| 1935 | goto out_lock; |
Chris Mason | 9b49c9b | 2008-09-24 11:23:25 -0400 | [diff] [blame] | 1936 | } else { |
| 1937 | /* the hole we're creating ends at the end |
| 1938 | * of the info struct, just free the info |
| 1939 | */ |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 1940 | kmem_cache_free(btrfs_free_space_cachep, info); |
Chris Mason | 9b49c9b | 2008-09-24 11:23:25 -0400 | [diff] [blame] | 1941 | } |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1942 | spin_unlock(&ctl->tree_lock); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1943 | |
| 1944 | /* step two, insert a new info struct to cover |
| 1945 | * anything before the hole |
Chris Mason | 9b49c9b | 2008-09-24 11:23:25 -0400 | [diff] [blame] | 1946 | */ |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 1947 | ret = btrfs_add_free_space(block_group, old_start, |
| 1948 | offset - old_start); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1949 | WARN_ON(ret); /* -ENOMEM */ |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1950 | goto out; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1951 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1952 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1953 | ret = remove_from_bitmap(ctl, info, &offset, &bytes); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1954 | if (ret == -EAGAIN) |
| 1955 | goto again; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1956 | BUG_ON(ret); /* logic error */ |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1957 | out_lock: |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1958 | spin_unlock(&ctl->tree_lock); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1959 | out: |
Josef Bacik | 2517920 | 2008-10-29 14:49:05 -0400 | [diff] [blame] | 1960 | return ret; |
| 1961 | } |
| 1962 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1963 | void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group, |
| 1964 | u64 bytes) |
| 1965 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1966 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1967 | struct btrfs_free_space *info; |
| 1968 | struct rb_node *n; |
| 1969 | int count = 0; |
| 1970 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1971 | 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] | 1972 | info = rb_entry(n, struct btrfs_free_space, offset_index); |
| 1973 | if (info->bytes >= bytes) |
| 1974 | count++; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1975 | printk(KERN_CRIT "entry offset %llu, bytes %llu, bitmap %s\n", |
Joel Becker | 2138093 | 2009-04-21 12:38:29 -0700 | [diff] [blame] | 1976 | (unsigned long long)info->offset, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1977 | (unsigned long long)info->bytes, |
| 1978 | (info->bitmap) ? "yes" : "no"); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1979 | } |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 1980 | printk(KERN_INFO "block group has cluster?: %s\n", |
| 1981 | list_empty(&block_group->cluster_list) ? "no" : "yes"); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1982 | printk(KERN_INFO "%d blocks of free space at or bigger than bytes is" |
| 1983 | "\n", count); |
| 1984 | } |
| 1985 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1986 | 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] | 1987 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1988 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1989 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1990 | spin_lock_init(&ctl->tree_lock); |
| 1991 | ctl->unit = block_group->sectorsize; |
| 1992 | ctl->start = block_group->key.objectid; |
| 1993 | ctl->private = block_group; |
| 1994 | ctl->op = &free_space_op; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 1995 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 1996 | /* |
| 1997 | * we only want to have 32k of ram per block group for keeping |
| 1998 | * track of free space, and if we pass 1/2 of that we want to |
| 1999 | * start converting things over to using bitmaps |
| 2000 | */ |
| 2001 | ctl->extents_thresh = ((1024 * 32) / 2) / |
| 2002 | sizeof(struct btrfs_free_space); |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2003 | } |
| 2004 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2005 | /* |
| 2006 | * for a given cluster, put all of its extents back into the free |
| 2007 | * space cache. If the block group passed doesn't match the block group |
| 2008 | * pointed to by the cluster, someone else raced in and freed the |
| 2009 | * cluster already. In that case, we just return without changing anything |
| 2010 | */ |
| 2011 | static int |
| 2012 | __btrfs_return_cluster_to_free_space( |
| 2013 | struct btrfs_block_group_cache *block_group, |
| 2014 | struct btrfs_free_cluster *cluster) |
| 2015 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2016 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2017 | struct btrfs_free_space *entry; |
| 2018 | struct rb_node *node; |
| 2019 | |
| 2020 | spin_lock(&cluster->lock); |
| 2021 | if (cluster->block_group != block_group) |
| 2022 | goto out; |
| 2023 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2024 | cluster->block_group = NULL; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2025 | cluster->window_start = 0; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2026 | list_del_init(&cluster->block_group_list); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2027 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2028 | node = rb_first(&cluster->root); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2029 | while (node) { |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2030 | bool bitmap; |
| 2031 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2032 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
| 2033 | node = rb_next(&entry->offset_index); |
| 2034 | rb_erase(&entry->offset_index, &cluster->root); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2035 | |
| 2036 | bitmap = (entry->bitmap != NULL); |
| 2037 | if (!bitmap) |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2038 | try_merge_free_space(ctl, entry, false); |
| 2039 | tree_insert_offset(&ctl->free_space_offset, |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2040 | entry->offset, &entry->offset_index, bitmap); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2041 | } |
Eric Paris | 6bef4d3 | 2010-02-23 19:43:04 +0000 | [diff] [blame] | 2042 | cluster->root = RB_ROOT; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2043 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2044 | out: |
| 2045 | spin_unlock(&cluster->lock); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2046 | btrfs_put_block_group(block_group); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2047 | return 0; |
| 2048 | } |
| 2049 | |
Chris Mason | 0965537 | 2011-05-21 09:27:38 -0400 | [diff] [blame] | 2050 | void __btrfs_remove_free_space_cache_locked(struct btrfs_free_space_ctl *ctl) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2051 | { |
| 2052 | struct btrfs_free_space *info; |
| 2053 | struct rb_node *node; |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 2054 | |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 2055 | while ((node = rb_last(&ctl->free_space_offset)) != NULL) { |
| 2056 | info = rb_entry(node, struct btrfs_free_space, offset_index); |
Josef Bacik | 9b90f51 | 2011-06-24 16:02:51 +0000 | [diff] [blame] | 2057 | if (!info->bitmap) { |
| 2058 | unlink_free_space(ctl, info); |
| 2059 | kmem_cache_free(btrfs_free_space_cachep, info); |
| 2060 | } else { |
| 2061 | free_bitmap(ctl, info); |
| 2062 | } |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 2063 | if (need_resched()) { |
| 2064 | spin_unlock(&ctl->tree_lock); |
| 2065 | cond_resched(); |
| 2066 | spin_lock(&ctl->tree_lock); |
| 2067 | } |
| 2068 | } |
Chris Mason | 0965537 | 2011-05-21 09:27:38 -0400 | [diff] [blame] | 2069 | } |
| 2070 | |
| 2071 | void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl) |
| 2072 | { |
| 2073 | spin_lock(&ctl->tree_lock); |
| 2074 | __btrfs_remove_free_space_cache_locked(ctl); |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 2075 | spin_unlock(&ctl->tree_lock); |
| 2076 | } |
| 2077 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2078 | void btrfs_remove_free_space_cache(struct btrfs_block_group_cache *block_group) |
| 2079 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2080 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2081 | struct btrfs_free_cluster *cluster; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2082 | struct list_head *head; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2083 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2084 | spin_lock(&ctl->tree_lock); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2085 | while ((head = block_group->cluster_list.next) != |
| 2086 | &block_group->cluster_list) { |
| 2087 | cluster = list_entry(head, struct btrfs_free_cluster, |
| 2088 | block_group_list); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2089 | |
| 2090 | WARN_ON(cluster->block_group != block_group); |
| 2091 | __btrfs_return_cluster_to_free_space(block_group, cluster); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2092 | if (need_resched()) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2093 | spin_unlock(&ctl->tree_lock); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2094 | cond_resched(); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2095 | spin_lock(&ctl->tree_lock); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2096 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2097 | } |
Chris Mason | 0965537 | 2011-05-21 09:27:38 -0400 | [diff] [blame] | 2098 | __btrfs_remove_free_space_cache_locked(ctl); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2099 | spin_unlock(&ctl->tree_lock); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2100 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2101 | } |
| 2102 | |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2103 | u64 btrfs_find_space_for_alloc(struct btrfs_block_group_cache *block_group, |
| 2104 | u64 offset, u64 bytes, u64 empty_size) |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2105 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2106 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2107 | struct btrfs_free_space *entry = NULL; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2108 | u64 bytes_search = bytes + empty_size; |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2109 | u64 ret = 0; |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2110 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2111 | spin_lock(&ctl->tree_lock); |
| 2112 | entry = find_free_space(ctl, &offset, &bytes_search); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2113 | if (!entry) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2114 | goto out; |
| 2115 | |
| 2116 | ret = offset; |
| 2117 | if (entry->bitmap) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2118 | bitmap_clear_bits(ctl, entry, offset, bytes); |
Li Zefan | edf6e2d | 2010-11-09 14:50:07 +0800 | [diff] [blame] | 2119 | if (!entry->bytes) |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2120 | free_bitmap(ctl, entry); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2121 | } else { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2122 | unlink_free_space(ctl, entry); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2123 | entry->offset += bytes; |
| 2124 | entry->bytes -= bytes; |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2125 | if (!entry->bytes) |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 2126 | kmem_cache_free(btrfs_free_space_cachep, entry); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2127 | else |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2128 | link_free_space(ctl, entry); |
Josef Bacik | 6226cb0a | 2009-04-03 10:14:18 -0400 | [diff] [blame] | 2129 | } |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2130 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2131 | out: |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2132 | spin_unlock(&ctl->tree_lock); |
Josef Bacik | 817d52f | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2133 | |
Josef Bacik | 0f9dd46 | 2008-09-23 13:14:11 -0400 | [diff] [blame] | 2134 | return ret; |
| 2135 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2136 | |
| 2137 | /* |
| 2138 | * given a cluster, put all of its extents back into the free space |
| 2139 | * cache. If a block group is passed, this function will only free |
| 2140 | * a cluster that belongs to the passed block group. |
| 2141 | * |
| 2142 | * Otherwise, it'll get a reference on the block group pointed to by the |
| 2143 | * cluster and remove the cluster from it. |
| 2144 | */ |
| 2145 | int btrfs_return_cluster_to_free_space( |
| 2146 | struct btrfs_block_group_cache *block_group, |
| 2147 | struct btrfs_free_cluster *cluster) |
| 2148 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2149 | struct btrfs_free_space_ctl *ctl; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2150 | int ret; |
| 2151 | |
| 2152 | /* first, get a safe pointer to the block group */ |
| 2153 | spin_lock(&cluster->lock); |
| 2154 | if (!block_group) { |
| 2155 | block_group = cluster->block_group; |
| 2156 | if (!block_group) { |
| 2157 | spin_unlock(&cluster->lock); |
| 2158 | return 0; |
| 2159 | } |
| 2160 | } else if (cluster->block_group != block_group) { |
| 2161 | /* someone else has already freed it don't redo their work */ |
| 2162 | spin_unlock(&cluster->lock); |
| 2163 | return 0; |
| 2164 | } |
| 2165 | atomic_inc(&block_group->count); |
| 2166 | spin_unlock(&cluster->lock); |
| 2167 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2168 | ctl = block_group->free_space_ctl; |
| 2169 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2170 | /* now return any extents the cluster had on it */ |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2171 | spin_lock(&ctl->tree_lock); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2172 | ret = __btrfs_return_cluster_to_free_space(block_group, cluster); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2173 | spin_unlock(&ctl->tree_lock); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2174 | |
| 2175 | /* finally drop our ref */ |
| 2176 | btrfs_put_block_group(block_group); |
| 2177 | return ret; |
| 2178 | } |
| 2179 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2180 | static u64 btrfs_alloc_from_bitmap(struct btrfs_block_group_cache *block_group, |
| 2181 | struct btrfs_free_cluster *cluster, |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2182 | struct btrfs_free_space *entry, |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2183 | u64 bytes, u64 min_start) |
| 2184 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2185 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2186 | int err; |
| 2187 | u64 search_start = cluster->window_start; |
| 2188 | u64 search_bytes = bytes; |
| 2189 | u64 ret = 0; |
| 2190 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2191 | search_start = min_start; |
| 2192 | search_bytes = bytes; |
| 2193 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2194 | err = search_bitmap(ctl, entry, &search_start, &search_bytes); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2195 | if (err) |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2196 | return 0; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2197 | |
| 2198 | ret = search_start; |
Miao Xie | bb3ac5a | 2011-08-05 09:32:35 +0000 | [diff] [blame] | 2199 | __bitmap_clear_bits(ctl, entry, ret, bytes); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2200 | |
| 2201 | return ret; |
| 2202 | } |
| 2203 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2204 | /* |
| 2205 | * given a cluster, try to allocate 'bytes' from it, returns 0 |
| 2206 | * if it couldn't find anything suitably large, or a logical disk offset |
| 2207 | * if things worked out |
| 2208 | */ |
| 2209 | u64 btrfs_alloc_from_cluster(struct btrfs_block_group_cache *block_group, |
| 2210 | struct btrfs_free_cluster *cluster, u64 bytes, |
| 2211 | u64 min_start) |
| 2212 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2213 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2214 | struct btrfs_free_space *entry = NULL; |
| 2215 | struct rb_node *node; |
| 2216 | u64 ret = 0; |
| 2217 | |
| 2218 | spin_lock(&cluster->lock); |
| 2219 | if (bytes > cluster->max_size) |
| 2220 | goto out; |
| 2221 | |
| 2222 | if (cluster->block_group != block_group) |
| 2223 | goto out; |
| 2224 | |
| 2225 | node = rb_first(&cluster->root); |
| 2226 | if (!node) |
| 2227 | goto out; |
| 2228 | |
| 2229 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2230 | while(1) { |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2231 | if (entry->bytes < bytes || |
| 2232 | (!entry->bitmap && entry->offset < min_start)) { |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2233 | node = rb_next(&entry->offset_index); |
| 2234 | if (!node) |
| 2235 | break; |
| 2236 | entry = rb_entry(node, struct btrfs_free_space, |
| 2237 | offset_index); |
| 2238 | continue; |
| 2239 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2240 | |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2241 | if (entry->bitmap) { |
| 2242 | ret = btrfs_alloc_from_bitmap(block_group, |
| 2243 | cluster, entry, bytes, |
Josef Bacik | 0b4a9d2 | 2012-01-26 15:01:11 -0500 | [diff] [blame] | 2244 | cluster->window_start); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2245 | if (ret == 0) { |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2246 | node = rb_next(&entry->offset_index); |
| 2247 | if (!node) |
| 2248 | break; |
| 2249 | entry = rb_entry(node, struct btrfs_free_space, |
| 2250 | offset_index); |
| 2251 | continue; |
| 2252 | } |
Josef Bacik | 9b23062 | 2012-01-26 15:01:12 -0500 | [diff] [blame] | 2253 | cluster->window_start += bytes; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2254 | } else { |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2255 | ret = entry->offset; |
| 2256 | |
| 2257 | entry->offset += bytes; |
| 2258 | entry->bytes -= bytes; |
| 2259 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2260 | |
Li Zefan | 5e71b5d | 2010-11-09 14:55:34 +0800 | [diff] [blame] | 2261 | if (entry->bytes == 0) |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2262 | rb_erase(&entry->offset_index, &cluster->root); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2263 | break; |
| 2264 | } |
| 2265 | out: |
| 2266 | spin_unlock(&cluster->lock); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2267 | |
Li Zefan | 5e71b5d | 2010-11-09 14:55:34 +0800 | [diff] [blame] | 2268 | if (!ret) |
| 2269 | return 0; |
| 2270 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2271 | spin_lock(&ctl->tree_lock); |
Li Zefan | 5e71b5d | 2010-11-09 14:55:34 +0800 | [diff] [blame] | 2272 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2273 | ctl->free_space -= bytes; |
Li Zefan | 5e71b5d | 2010-11-09 14:55:34 +0800 | [diff] [blame] | 2274 | if (entry->bytes == 0) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2275 | ctl->free_extents--; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2276 | if (entry->bitmap) { |
| 2277 | kfree(entry->bitmap); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2278 | ctl->total_bitmaps--; |
| 2279 | ctl->op->recalc_thresholds(ctl); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2280 | } |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 2281 | kmem_cache_free(btrfs_free_space_cachep, entry); |
Li Zefan | 5e71b5d | 2010-11-09 14:55:34 +0800 | [diff] [blame] | 2282 | } |
| 2283 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2284 | spin_unlock(&ctl->tree_lock); |
Li Zefan | 5e71b5d | 2010-11-09 14:55:34 +0800 | [diff] [blame] | 2285 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2286 | return ret; |
| 2287 | } |
| 2288 | |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2289 | static int btrfs_bitmap_cluster(struct btrfs_block_group_cache *block_group, |
| 2290 | struct btrfs_free_space *entry, |
| 2291 | struct btrfs_free_cluster *cluster, |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2292 | u64 offset, u64 bytes, |
| 2293 | u64 cont1_bytes, u64 min_bytes) |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2294 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2295 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2296 | unsigned long next_zero; |
| 2297 | unsigned long i; |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2298 | unsigned long want_bits; |
| 2299 | unsigned long min_bits; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2300 | unsigned long found_bits; |
| 2301 | unsigned long start = 0; |
| 2302 | unsigned long total_found = 0; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2303 | int ret; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2304 | |
| 2305 | i = offset_to_bit(entry->offset, block_group->sectorsize, |
| 2306 | max_t(u64, offset, entry->offset)); |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2307 | want_bits = bytes_to_bits(bytes, block_group->sectorsize); |
| 2308 | min_bits = bytes_to_bits(min_bytes, block_group->sectorsize); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2309 | |
| 2310 | again: |
| 2311 | found_bits = 0; |
| 2312 | for (i = find_next_bit(entry->bitmap, BITS_PER_BITMAP, i); |
| 2313 | i < BITS_PER_BITMAP; |
| 2314 | i = find_next_bit(entry->bitmap, BITS_PER_BITMAP, i + 1)) { |
| 2315 | next_zero = find_next_zero_bit(entry->bitmap, |
| 2316 | BITS_PER_BITMAP, i); |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2317 | if (next_zero - i >= min_bits) { |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2318 | found_bits = next_zero - i; |
| 2319 | break; |
| 2320 | } |
| 2321 | i = next_zero; |
| 2322 | } |
| 2323 | |
| 2324 | if (!found_bits) |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2325 | return -ENOSPC; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2326 | |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2327 | if (!total_found) { |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2328 | start = i; |
Alexandre Oliva | b78d09b | 2011-11-30 13:43:00 -0500 | [diff] [blame] | 2329 | cluster->max_size = 0; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2330 | } |
| 2331 | |
| 2332 | total_found += found_bits; |
| 2333 | |
| 2334 | if (cluster->max_size < found_bits * block_group->sectorsize) |
| 2335 | cluster->max_size = found_bits * block_group->sectorsize; |
| 2336 | |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2337 | if (total_found < want_bits || cluster->max_size < cont1_bytes) { |
| 2338 | i = next_zero + 1; |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2339 | goto again; |
| 2340 | } |
| 2341 | |
| 2342 | cluster->window_start = start * block_group->sectorsize + |
| 2343 | entry->offset; |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2344 | rb_erase(&entry->offset_index, &ctl->free_space_offset); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2345 | ret = tree_insert_offset(&cluster->root, entry->offset, |
| 2346 | &entry->offset_index, 1); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2347 | BUG_ON(ret); /* -EEXIST; Logic error */ |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2348 | |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 2349 | trace_btrfs_setup_cluster(block_group, cluster, |
| 2350 | total_found * block_group->sectorsize, 1); |
Josef Bacik | 9630308 | 2009-07-13 21:29:25 -0400 | [diff] [blame] | 2351 | return 0; |
| 2352 | } |
| 2353 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2354 | /* |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2355 | * 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] | 2356 | * Try to find a cluster with at least bytes total bytes, at least one |
| 2357 | * extent of cont1_bytes, and other clusters of at least min_bytes. |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2358 | */ |
Josef Bacik | 3de85bb | 2011-05-25 13:07:37 -0400 | [diff] [blame] | 2359 | static noinline int |
| 2360 | setup_cluster_no_bitmap(struct btrfs_block_group_cache *block_group, |
| 2361 | struct btrfs_free_cluster *cluster, |
| 2362 | struct list_head *bitmaps, u64 offset, u64 bytes, |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2363 | u64 cont1_bytes, u64 min_bytes) |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2364 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2365 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2366 | struct btrfs_free_space *first = NULL; |
| 2367 | struct btrfs_free_space *entry = NULL; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2368 | struct btrfs_free_space *last; |
| 2369 | struct rb_node *node; |
| 2370 | u64 window_start; |
| 2371 | u64 window_free; |
| 2372 | u64 max_extent; |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 2373 | u64 total_size = 0; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2374 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2375 | entry = tree_search_offset(ctl, offset, 0, 1); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2376 | if (!entry) |
| 2377 | return -ENOSPC; |
| 2378 | |
| 2379 | /* |
| 2380 | * We don't want bitmaps, so just move along until we find a normal |
| 2381 | * extent entry. |
| 2382 | */ |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2383 | while (entry->bitmap || entry->bytes < min_bytes) { |
| 2384 | if (entry->bitmap && list_empty(&entry->list)) |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2385 | list_add_tail(&entry->list, bitmaps); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2386 | node = rb_next(&entry->offset_index); |
| 2387 | if (!node) |
| 2388 | return -ENOSPC; |
| 2389 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
| 2390 | } |
| 2391 | |
| 2392 | window_start = entry->offset; |
| 2393 | window_free = entry->bytes; |
| 2394 | max_extent = entry->bytes; |
| 2395 | first = entry; |
| 2396 | last = entry; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2397 | |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2398 | for (node = rb_next(&entry->offset_index); node; |
| 2399 | node = rb_next(&entry->offset_index)) { |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2400 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
| 2401 | |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2402 | if (entry->bitmap) { |
| 2403 | if (list_empty(&entry->list)) |
| 2404 | list_add_tail(&entry->list, bitmaps); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2405 | continue; |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2406 | } |
| 2407 | |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2408 | if (entry->bytes < min_bytes) |
| 2409 | continue; |
| 2410 | |
| 2411 | last = entry; |
| 2412 | window_free += entry->bytes; |
| 2413 | if (entry->bytes > max_extent) |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2414 | max_extent = entry->bytes; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2415 | } |
| 2416 | |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2417 | if (window_free < bytes || max_extent < cont1_bytes) |
| 2418 | return -ENOSPC; |
| 2419 | |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2420 | cluster->window_start = first->offset; |
| 2421 | |
| 2422 | node = &first->offset_index; |
| 2423 | |
| 2424 | /* |
| 2425 | * now we've found our entries, pull them out of the free space |
| 2426 | * cache and put them into the cluster rbtree |
| 2427 | */ |
| 2428 | do { |
| 2429 | int ret; |
| 2430 | |
| 2431 | entry = rb_entry(node, struct btrfs_free_space, offset_index); |
| 2432 | node = rb_next(&entry->offset_index); |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2433 | if (entry->bitmap || entry->bytes < min_bytes) |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2434 | continue; |
| 2435 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2436 | rb_erase(&entry->offset_index, &ctl->free_space_offset); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2437 | ret = tree_insert_offset(&cluster->root, entry->offset, |
| 2438 | &entry->offset_index, 0); |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 2439 | total_size += entry->bytes; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2440 | BUG_ON(ret); /* -EEXIST; Logic error */ |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2441 | } while (node && entry != last); |
| 2442 | |
| 2443 | cluster->max_size = max_extent; |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 2444 | trace_btrfs_setup_cluster(block_group, cluster, total_size, 0); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2445 | return 0; |
| 2446 | } |
| 2447 | |
| 2448 | /* |
| 2449 | * This specifically looks for bitmaps that may work in the cluster, we assume |
| 2450 | * that we have already failed to find extents that will work. |
| 2451 | */ |
Josef Bacik | 3de85bb | 2011-05-25 13:07:37 -0400 | [diff] [blame] | 2452 | static noinline int |
| 2453 | setup_cluster_bitmap(struct btrfs_block_group_cache *block_group, |
| 2454 | struct btrfs_free_cluster *cluster, |
| 2455 | struct list_head *bitmaps, u64 offset, u64 bytes, |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2456 | u64 cont1_bytes, u64 min_bytes) |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2457 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2458 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2459 | struct btrfs_free_space *entry; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2460 | int ret = -ENOSPC; |
Li Zefan | 0f0fbf1 | 2011-11-20 07:33:38 -0500 | [diff] [blame] | 2461 | u64 bitmap_offset = offset_to_bitmap(ctl, offset); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2462 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2463 | if (ctl->total_bitmaps == 0) |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2464 | return -ENOSPC; |
| 2465 | |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2466 | /* |
Li Zefan | 0f0fbf1 | 2011-11-20 07:33:38 -0500 | [diff] [blame] | 2467 | * The bitmap that covers offset won't be in the list unless offset |
| 2468 | * is just its start offset. |
| 2469 | */ |
| 2470 | entry = list_first_entry(bitmaps, struct btrfs_free_space, list); |
| 2471 | if (entry->offset != bitmap_offset) { |
| 2472 | entry = tree_search_offset(ctl, bitmap_offset, 1, 0); |
| 2473 | if (entry && list_empty(&entry->list)) |
| 2474 | list_add(&entry->list, bitmaps); |
| 2475 | } |
| 2476 | |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2477 | list_for_each_entry(entry, bitmaps, list) { |
Josef Bacik | 357b978 | 2012-01-26 15:01:11 -0500 | [diff] [blame] | 2478 | if (entry->bytes < bytes) |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2479 | continue; |
| 2480 | ret = btrfs_bitmap_cluster(block_group, entry, cluster, offset, |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2481 | bytes, cont1_bytes, min_bytes); |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2482 | if (!ret) |
| 2483 | return 0; |
| 2484 | } |
| 2485 | |
| 2486 | /* |
Li Zefan | 52621cb | 2011-11-20 07:33:38 -0500 | [diff] [blame] | 2487 | * The bitmaps list has all the bitmaps that record free space |
| 2488 | * starting after offset, so no more search is required. |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2489 | */ |
Li Zefan | 52621cb | 2011-11-20 07:33:38 -0500 | [diff] [blame] | 2490 | return -ENOSPC; |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2491 | } |
| 2492 | |
| 2493 | /* |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2494 | * 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] | 2495 | * is to find at least bytes+empty_size. |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2496 | * We might not find them all in one contiguous area. |
| 2497 | * |
| 2498 | * returns zero and sets up cluster if things worked out, otherwise |
| 2499 | * it returns -enospc |
| 2500 | */ |
| 2501 | int btrfs_find_space_cluster(struct btrfs_trans_handle *trans, |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 2502 | struct btrfs_root *root, |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2503 | struct btrfs_block_group_cache *block_group, |
| 2504 | struct btrfs_free_cluster *cluster, |
| 2505 | u64 offset, u64 bytes, u64 empty_size) |
| 2506 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2507 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2508 | struct btrfs_free_space *entry, *tmp; |
Li Zefan | 52621cb | 2011-11-20 07:33:38 -0500 | [diff] [blame] | 2509 | LIST_HEAD(bitmaps); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2510 | u64 min_bytes; |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2511 | u64 cont1_bytes; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2512 | int ret; |
| 2513 | |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2514 | /* |
| 2515 | * Choose the minimum extent size we'll require for this |
| 2516 | * cluster. For SSD_SPREAD, don't allow any fragmentation. |
| 2517 | * For metadata, allow allocates with smaller extents. For |
| 2518 | * data, keep it dense. |
| 2519 | */ |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 2520 | if (btrfs_test_opt(root, SSD_SPREAD)) { |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2521 | cont1_bytes = min_bytes = bytes + empty_size; |
Chris Mason | 451d758 | 2009-06-09 20:28:34 -0400 | [diff] [blame] | 2522 | } else if (block_group->flags & BTRFS_BLOCK_GROUP_METADATA) { |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2523 | cont1_bytes = bytes; |
| 2524 | min_bytes = block_group->sectorsize; |
| 2525 | } else { |
| 2526 | cont1_bytes = max(bytes, (bytes + empty_size) >> 2); |
| 2527 | min_bytes = block_group->sectorsize; |
| 2528 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2529 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2530 | spin_lock(&ctl->tree_lock); |
Josef Bacik | 7d0d2e8 | 2011-03-18 15:13:42 -0400 | [diff] [blame] | 2531 | |
| 2532 | /* |
| 2533 | * If we know we don't have enough space to make a cluster don't even |
| 2534 | * bother doing all the work to try and find one. |
| 2535 | */ |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2536 | if (ctl->free_space < bytes) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2537 | spin_unlock(&ctl->tree_lock); |
Josef Bacik | 7d0d2e8 | 2011-03-18 15:13:42 -0400 | [diff] [blame] | 2538 | return -ENOSPC; |
| 2539 | } |
| 2540 | |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2541 | spin_lock(&cluster->lock); |
| 2542 | |
| 2543 | /* someone already found a cluster, hooray */ |
| 2544 | if (cluster->block_group) { |
| 2545 | ret = 0; |
| 2546 | goto out; |
| 2547 | } |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2548 | |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 2549 | trace_btrfs_find_cluster(block_group, offset, bytes, empty_size, |
| 2550 | min_bytes); |
| 2551 | |
| 2552 | INIT_LIST_HEAD(&bitmaps); |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2553 | ret = setup_cluster_no_bitmap(block_group, cluster, &bitmaps, offset, |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2554 | bytes + empty_size, |
| 2555 | cont1_bytes, min_bytes); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2556 | if (ret) |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2557 | ret = setup_cluster_bitmap(block_group, cluster, &bitmaps, |
Alexandre Oliva | 1bb9190 | 2011-10-14 12:10:36 -0300 | [diff] [blame] | 2558 | offset, bytes + empty_size, |
| 2559 | cont1_bytes, min_bytes); |
Josef Bacik | 86d4a77 | 2011-05-25 13:03:16 -0400 | [diff] [blame] | 2560 | |
| 2561 | /* Clear our temporary list */ |
| 2562 | list_for_each_entry_safe(entry, tmp, &bitmaps, list) |
| 2563 | list_del_init(&entry->list); |
Josef Bacik | 4e69b59 | 2011-03-21 10:11:24 -0400 | [diff] [blame] | 2564 | |
| 2565 | if (!ret) { |
| 2566 | atomic_inc(&block_group->count); |
| 2567 | list_add_tail(&cluster->block_group_list, |
| 2568 | &block_group->cluster_list); |
| 2569 | cluster->block_group = block_group; |
Josef Bacik | 3f7de03 | 2011-11-10 08:29:20 -0500 | [diff] [blame] | 2570 | } else { |
| 2571 | trace_btrfs_failed_cluster_setup(block_group); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2572 | } |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2573 | out: |
| 2574 | spin_unlock(&cluster->lock); |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2575 | spin_unlock(&ctl->tree_lock); |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2576 | |
| 2577 | return ret; |
| 2578 | } |
| 2579 | |
| 2580 | /* |
| 2581 | * simple code to zero out a cluster |
| 2582 | */ |
| 2583 | void btrfs_init_free_cluster(struct btrfs_free_cluster *cluster) |
| 2584 | { |
| 2585 | spin_lock_init(&cluster->lock); |
| 2586 | spin_lock_init(&cluster->refill_lock); |
Eric Paris | 6bef4d3 | 2010-02-23 19:43:04 +0000 | [diff] [blame] | 2587 | cluster->root = RB_ROOT; |
Chris Mason | fa9c0d79 | 2009-04-03 09:47:43 -0400 | [diff] [blame] | 2588 | cluster->max_size = 0; |
| 2589 | INIT_LIST_HEAD(&cluster->block_group_list); |
| 2590 | cluster->block_group = NULL; |
| 2591 | } |
| 2592 | |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 2593 | static int do_trimming(struct btrfs_block_group_cache *block_group, |
| 2594 | u64 *total_trimmed, u64 start, u64 bytes, |
| 2595 | u64 reserved_start, u64 reserved_bytes) |
| 2596 | { |
| 2597 | struct btrfs_space_info *space_info = block_group->space_info; |
| 2598 | struct btrfs_fs_info *fs_info = block_group->fs_info; |
| 2599 | int ret; |
| 2600 | int update = 0; |
| 2601 | u64 trimmed = 0; |
| 2602 | |
| 2603 | spin_lock(&space_info->lock); |
| 2604 | spin_lock(&block_group->lock); |
| 2605 | if (!block_group->ro) { |
| 2606 | block_group->reserved += reserved_bytes; |
| 2607 | space_info->bytes_reserved += reserved_bytes; |
| 2608 | update = 1; |
| 2609 | } |
| 2610 | spin_unlock(&block_group->lock); |
| 2611 | spin_unlock(&space_info->lock); |
| 2612 | |
| 2613 | ret = btrfs_error_discard_extent(fs_info->extent_root, |
| 2614 | start, bytes, &trimmed); |
| 2615 | if (!ret) |
| 2616 | *total_trimmed += trimmed; |
| 2617 | |
| 2618 | btrfs_add_free_space(block_group, reserved_start, reserved_bytes); |
| 2619 | |
| 2620 | if (update) { |
| 2621 | spin_lock(&space_info->lock); |
| 2622 | spin_lock(&block_group->lock); |
| 2623 | if (block_group->ro) |
| 2624 | space_info->bytes_readonly += reserved_bytes; |
| 2625 | block_group->reserved -= reserved_bytes; |
| 2626 | space_info->bytes_reserved -= reserved_bytes; |
| 2627 | spin_unlock(&space_info->lock); |
| 2628 | spin_unlock(&block_group->lock); |
| 2629 | } |
| 2630 | |
| 2631 | return ret; |
| 2632 | } |
| 2633 | |
| 2634 | static int trim_no_bitmap(struct btrfs_block_group_cache *block_group, |
| 2635 | u64 *total_trimmed, u64 start, u64 end, u64 minlen) |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 2636 | { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2637 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 2638 | struct btrfs_free_space *entry; |
| 2639 | struct rb_node *node; |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 2640 | int ret = 0; |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 2641 | u64 extent_start; |
| 2642 | u64 extent_bytes; |
| 2643 | u64 bytes; |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 2644 | |
| 2645 | while (start < end) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2646 | spin_lock(&ctl->tree_lock); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 2647 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2648 | if (ctl->free_space < minlen) { |
| 2649 | spin_unlock(&ctl->tree_lock); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 2650 | break; |
| 2651 | } |
| 2652 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2653 | entry = tree_search_offset(ctl, start, 0, 1); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 2654 | if (!entry) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2655 | spin_unlock(&ctl->tree_lock); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 2656 | break; |
| 2657 | } |
| 2658 | |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 2659 | /* skip bitmaps */ |
| 2660 | while (entry->bitmap) { |
| 2661 | node = rb_next(&entry->offset_index); |
| 2662 | if (!node) { |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2663 | spin_unlock(&ctl->tree_lock); |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 2664 | goto out; |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 2665 | } |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 2666 | entry = rb_entry(node, struct btrfs_free_space, |
| 2667 | offset_index); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 2668 | } |
| 2669 | |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 2670 | if (entry->offset >= end) { |
| 2671 | spin_unlock(&ctl->tree_lock); |
| 2672 | break; |
| 2673 | } |
| 2674 | |
| 2675 | extent_start = entry->offset; |
| 2676 | extent_bytes = entry->bytes; |
| 2677 | start = max(start, extent_start); |
| 2678 | bytes = min(extent_start + extent_bytes, end) - start; |
| 2679 | if (bytes < minlen) { |
| 2680 | spin_unlock(&ctl->tree_lock); |
| 2681 | goto next; |
| 2682 | } |
| 2683 | |
| 2684 | unlink_free_space(ctl, entry); |
| 2685 | kmem_cache_free(btrfs_free_space_cachep, entry); |
| 2686 | |
Li Zefan | 34d52cb | 2011-03-29 13:46:06 +0800 | [diff] [blame] | 2687 | spin_unlock(&ctl->tree_lock); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 2688 | |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 2689 | ret = do_trimming(block_group, total_trimmed, start, bytes, |
| 2690 | extent_start, extent_bytes); |
| 2691 | if (ret) |
| 2692 | break; |
| 2693 | next: |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 2694 | start += bytes; |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 2695 | |
| 2696 | if (fatal_signal_pending(current)) { |
| 2697 | ret = -ERESTARTSYS; |
| 2698 | break; |
| 2699 | } |
| 2700 | |
| 2701 | cond_resched(); |
| 2702 | } |
Li Zefan | 7fe1e64 | 2011-12-29 14:47:27 +0800 | [diff] [blame] | 2703 | out: |
| 2704 | return ret; |
| 2705 | } |
| 2706 | |
| 2707 | static int trim_bitmaps(struct btrfs_block_group_cache *block_group, |
| 2708 | u64 *total_trimmed, u64 start, u64 end, u64 minlen) |
| 2709 | { |
| 2710 | struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl; |
| 2711 | struct btrfs_free_space *entry; |
| 2712 | int ret = 0; |
| 2713 | int ret2; |
| 2714 | u64 bytes; |
| 2715 | u64 offset = offset_to_bitmap(ctl, start); |
| 2716 | |
| 2717 | while (offset < end) { |
| 2718 | bool next_bitmap = false; |
| 2719 | |
| 2720 | spin_lock(&ctl->tree_lock); |
| 2721 | |
| 2722 | if (ctl->free_space < minlen) { |
| 2723 | spin_unlock(&ctl->tree_lock); |
| 2724 | break; |
| 2725 | } |
| 2726 | |
| 2727 | entry = tree_search_offset(ctl, offset, 1, 0); |
| 2728 | if (!entry) { |
| 2729 | spin_unlock(&ctl->tree_lock); |
| 2730 | next_bitmap = true; |
| 2731 | goto next; |
| 2732 | } |
| 2733 | |
| 2734 | bytes = minlen; |
| 2735 | ret2 = search_bitmap(ctl, entry, &start, &bytes); |
| 2736 | if (ret2 || start >= end) { |
| 2737 | spin_unlock(&ctl->tree_lock); |
| 2738 | next_bitmap = true; |
| 2739 | goto next; |
| 2740 | } |
| 2741 | |
| 2742 | bytes = min(bytes, end - start); |
| 2743 | if (bytes < minlen) { |
| 2744 | spin_unlock(&ctl->tree_lock); |
| 2745 | goto next; |
| 2746 | } |
| 2747 | |
| 2748 | bitmap_clear_bits(ctl, entry, start, bytes); |
| 2749 | if (entry->bytes == 0) |
| 2750 | free_bitmap(ctl, entry); |
| 2751 | |
| 2752 | spin_unlock(&ctl->tree_lock); |
| 2753 | |
| 2754 | ret = do_trimming(block_group, total_trimmed, start, bytes, |
| 2755 | start, bytes); |
| 2756 | if (ret) |
| 2757 | break; |
| 2758 | next: |
| 2759 | if (next_bitmap) { |
| 2760 | offset += BITS_PER_BITMAP * ctl->unit; |
| 2761 | } else { |
| 2762 | start += bytes; |
| 2763 | if (start >= offset + BITS_PER_BITMAP * ctl->unit) |
| 2764 | offset += BITS_PER_BITMAP * ctl->unit; |
| 2765 | } |
| 2766 | |
| 2767 | if (fatal_signal_pending(current)) { |
| 2768 | ret = -ERESTARTSYS; |
| 2769 | break; |
| 2770 | } |
| 2771 | |
| 2772 | cond_resched(); |
| 2773 | } |
| 2774 | |
| 2775 | return ret; |
| 2776 | } |
| 2777 | |
| 2778 | int btrfs_trim_block_group(struct btrfs_block_group_cache *block_group, |
| 2779 | u64 *trimmed, u64 start, u64 end, u64 minlen) |
| 2780 | { |
| 2781 | int ret; |
| 2782 | |
| 2783 | *trimmed = 0; |
| 2784 | |
| 2785 | ret = trim_no_bitmap(block_group, trimmed, start, end, minlen); |
| 2786 | if (ret) |
| 2787 | return ret; |
| 2788 | |
| 2789 | ret = trim_bitmaps(block_group, trimmed, start, end, minlen); |
Li Dongyang | f7039b1 | 2011-03-24 10:24:28 +0000 | [diff] [blame] | 2790 | |
| 2791 | return ret; |
| 2792 | } |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 2793 | |
| 2794 | /* |
| 2795 | * Find the left-most item in the cache tree, and then return the |
| 2796 | * smallest inode number in the item. |
| 2797 | * |
| 2798 | * Note: the returned inode number may not be the smallest one in |
| 2799 | * the tree, if the left-most item is a bitmap. |
| 2800 | */ |
| 2801 | u64 btrfs_find_ino_for_alloc(struct btrfs_root *fs_root) |
| 2802 | { |
| 2803 | struct btrfs_free_space_ctl *ctl = fs_root->free_ino_ctl; |
| 2804 | struct btrfs_free_space *entry = NULL; |
| 2805 | u64 ino = 0; |
| 2806 | |
| 2807 | spin_lock(&ctl->tree_lock); |
| 2808 | |
| 2809 | if (RB_EMPTY_ROOT(&ctl->free_space_offset)) |
| 2810 | goto out; |
| 2811 | |
| 2812 | entry = rb_entry(rb_first(&ctl->free_space_offset), |
| 2813 | struct btrfs_free_space, offset_index); |
| 2814 | |
| 2815 | if (!entry->bitmap) { |
| 2816 | ino = entry->offset; |
| 2817 | |
| 2818 | unlink_free_space(ctl, entry); |
| 2819 | entry->offset++; |
| 2820 | entry->bytes--; |
| 2821 | if (!entry->bytes) |
| 2822 | kmem_cache_free(btrfs_free_space_cachep, entry); |
| 2823 | else |
| 2824 | link_free_space(ctl, entry); |
| 2825 | } else { |
| 2826 | u64 offset = 0; |
| 2827 | u64 count = 1; |
| 2828 | int ret; |
| 2829 | |
| 2830 | ret = search_bitmap(ctl, entry, &offset, &count); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2831 | /* Logic error; Should be empty if it can't find anything */ |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 2832 | BUG_ON(ret); |
| 2833 | |
| 2834 | ino = offset; |
| 2835 | bitmap_clear_bits(ctl, entry, offset, 1); |
| 2836 | if (entry->bytes == 0) |
| 2837 | free_bitmap(ctl, entry); |
| 2838 | } |
| 2839 | out: |
| 2840 | spin_unlock(&ctl->tree_lock); |
| 2841 | |
| 2842 | return ino; |
| 2843 | } |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 2844 | |
| 2845 | struct inode *lookup_free_ino_inode(struct btrfs_root *root, |
| 2846 | struct btrfs_path *path) |
| 2847 | { |
| 2848 | struct inode *inode = NULL; |
| 2849 | |
| 2850 | spin_lock(&root->cache_lock); |
| 2851 | if (root->cache_inode) |
| 2852 | inode = igrab(root->cache_inode); |
| 2853 | spin_unlock(&root->cache_lock); |
| 2854 | if (inode) |
| 2855 | return inode; |
| 2856 | |
| 2857 | inode = __lookup_free_space_inode(root, path, 0); |
| 2858 | if (IS_ERR(inode)) |
| 2859 | return inode; |
| 2860 | |
| 2861 | spin_lock(&root->cache_lock); |
David Sterba | 7841cb2 | 2011-05-31 18:07:27 +0200 | [diff] [blame] | 2862 | if (!btrfs_fs_closing(root->fs_info)) |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 2863 | root->cache_inode = igrab(inode); |
| 2864 | spin_unlock(&root->cache_lock); |
| 2865 | |
| 2866 | return inode; |
| 2867 | } |
| 2868 | |
| 2869 | int create_free_ino_inode(struct btrfs_root *root, |
| 2870 | struct btrfs_trans_handle *trans, |
| 2871 | struct btrfs_path *path) |
| 2872 | { |
| 2873 | return __create_free_space_inode(root, trans, path, |
| 2874 | BTRFS_FREE_INO_OBJECTID, 0); |
| 2875 | } |
| 2876 | |
| 2877 | int load_free_ino_cache(struct btrfs_fs_info *fs_info, struct btrfs_root *root) |
| 2878 | { |
| 2879 | struct btrfs_free_space_ctl *ctl = root->free_ino_ctl; |
| 2880 | struct btrfs_path *path; |
| 2881 | struct inode *inode; |
| 2882 | int ret = 0; |
| 2883 | u64 root_gen = btrfs_root_generation(&root->root_item); |
| 2884 | |
Chris Mason | 4b9465c | 2011-06-03 09:36:29 -0400 | [diff] [blame] | 2885 | if (!btrfs_test_opt(root, INODE_MAP_CACHE)) |
| 2886 | return 0; |
| 2887 | |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 2888 | /* |
| 2889 | * If we're unmounting then just return, since this does a search on the |
| 2890 | * normal root and not the commit root and we could deadlock. |
| 2891 | */ |
David Sterba | 7841cb2 | 2011-05-31 18:07:27 +0200 | [diff] [blame] | 2892 | if (btrfs_fs_closing(fs_info)) |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 2893 | return 0; |
| 2894 | |
| 2895 | path = btrfs_alloc_path(); |
| 2896 | if (!path) |
| 2897 | return 0; |
| 2898 | |
| 2899 | inode = lookup_free_ino_inode(root, path); |
| 2900 | if (IS_ERR(inode)) |
| 2901 | goto out; |
| 2902 | |
| 2903 | if (root_gen != BTRFS_I(inode)->generation) |
| 2904 | goto out_put; |
| 2905 | |
| 2906 | ret = __load_free_space_cache(root, inode, ctl, path, 0); |
| 2907 | |
| 2908 | if (ret < 0) |
| 2909 | printk(KERN_ERR "btrfs: failed to load free ino cache for " |
| 2910 | "root %llu\n", root->root_key.objectid); |
| 2911 | out_put: |
| 2912 | iput(inode); |
| 2913 | out: |
| 2914 | btrfs_free_path(path); |
| 2915 | return ret; |
| 2916 | } |
| 2917 | |
| 2918 | int btrfs_write_out_ino_cache(struct btrfs_root *root, |
| 2919 | struct btrfs_trans_handle *trans, |
| 2920 | struct btrfs_path *path) |
| 2921 | { |
| 2922 | struct btrfs_free_space_ctl *ctl = root->free_ino_ctl; |
| 2923 | struct inode *inode; |
| 2924 | int ret; |
| 2925 | |
Chris Mason | 4b9465c | 2011-06-03 09:36:29 -0400 | [diff] [blame] | 2926 | if (!btrfs_test_opt(root, INODE_MAP_CACHE)) |
| 2927 | return 0; |
| 2928 | |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 2929 | inode = lookup_free_ino_inode(root, path); |
| 2930 | if (IS_ERR(inode)) |
| 2931 | return 0; |
| 2932 | |
| 2933 | ret = __btrfs_write_out_cache(root, inode, ctl, NULL, trans, path, 0); |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 2934 | if (ret) { |
| 2935 | btrfs_delalloc_release_metadata(inode, inode->i_size); |
| 2936 | #ifdef DEBUG |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 2937 | printk(KERN_ERR "btrfs: failed to write free ino cache " |
| 2938 | "for root %llu\n", root->root_key.objectid); |
Josef Bacik | c09544e | 2011-08-30 10:19:10 -0400 | [diff] [blame] | 2939 | #endif |
| 2940 | } |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 2941 | |
| 2942 | iput(inode); |
| 2943 | return ret; |
| 2944 | } |