Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2008 Oracle. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public |
| 6 | * License v2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public |
| 14 | * License along with this program; if not, write to the |
| 15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 16 | * Boston, MA 021110-1307, USA. |
| 17 | */ |
| 18 | |
| 19 | #include <linux/sched.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 20 | #include <linux/slab.h> |
Miao Xie | c6adc9c | 2013-05-28 10:05:39 +0000 | [diff] [blame] | 21 | #include <linux/blkdev.h> |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 22 | #include <linux/list_sort.h> |
Miao Xie | 995946d | 2014-04-02 19:51:06 +0800 | [diff] [blame] | 23 | #include "tree-log.h" |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 24 | #include "disk-io.h" |
| 25 | #include "locking.h" |
| 26 | #include "print-tree.h" |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 27 | #include "backref.h" |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 28 | #include "hash.h" |
Anand Jain | ebb8765 | 2016-03-10 17:26:59 +0800 | [diff] [blame] | 29 | #include "compression.h" |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 30 | |
| 31 | /* magic values for the inode_only field in btrfs_log_inode: |
| 32 | * |
| 33 | * LOG_INODE_ALL means to log everything |
| 34 | * LOG_INODE_EXISTS means to log just enough to recreate the inode |
| 35 | * during log replay |
| 36 | */ |
| 37 | #define LOG_INODE_ALL 0 |
| 38 | #define LOG_INODE_EXISTS 1 |
| 39 | |
| 40 | /* |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 41 | * directory trouble cases |
| 42 | * |
| 43 | * 1) on rename or unlink, if the inode being unlinked isn't in the fsync |
| 44 | * log, we must force a full commit before doing an fsync of the directory |
| 45 | * where the unlink was done. |
| 46 | * ---> record transid of last unlink/rename per directory |
| 47 | * |
| 48 | * mkdir foo/some_dir |
| 49 | * normal commit |
| 50 | * rename foo/some_dir foo2/some_dir |
| 51 | * mkdir foo/some_dir |
| 52 | * fsync foo/some_dir/some_file |
| 53 | * |
| 54 | * The fsync above will unlink the original some_dir without recording |
| 55 | * it in its new location (foo2). After a crash, some_dir will be gone |
| 56 | * unless the fsync of some_file forces a full commit |
| 57 | * |
| 58 | * 2) we must log any new names for any file or dir that is in the fsync |
| 59 | * log. ---> check inode while renaming/linking. |
| 60 | * |
| 61 | * 2a) we must log any new names for any file or dir during rename |
| 62 | * when the directory they are being removed from was logged. |
| 63 | * ---> check inode and old parent dir during rename |
| 64 | * |
| 65 | * 2a is actually the more important variant. With the extra logging |
| 66 | * a crash might unlink the old name without recreating the new one |
| 67 | * |
| 68 | * 3) after a crash, we must go through any directories with a link count |
| 69 | * of zero and redo the rm -rf |
| 70 | * |
| 71 | * mkdir f1/foo |
| 72 | * normal commit |
| 73 | * rm -rf f1/foo |
| 74 | * fsync(f1) |
| 75 | * |
| 76 | * The directory f1 was fully removed from the FS, but fsync was never |
| 77 | * called on f1, only its parent dir. After a crash the rm -rf must |
| 78 | * be replayed. This must be able to recurse down the entire |
| 79 | * directory tree. The inode link count fixup code takes care of the |
| 80 | * ugly details. |
| 81 | */ |
| 82 | |
| 83 | /* |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 84 | * stages for the tree walking. The first |
| 85 | * stage (0) is to only pin down the blocks we find |
| 86 | * the second stage (1) is to make sure that all the inodes |
| 87 | * we find in the log are created in the subvolume. |
| 88 | * |
| 89 | * The last stage is to deal with directories and links and extents |
| 90 | * and all the other fun semantics |
| 91 | */ |
| 92 | #define LOG_WALK_PIN_ONLY 0 |
| 93 | #define LOG_WALK_REPLAY_INODES 1 |
Josef Bacik | dd8e721 | 2013-09-11 11:57:23 -0400 | [diff] [blame] | 94 | #define LOG_WALK_REPLAY_DIR_INDEX 2 |
| 95 | #define LOG_WALK_REPLAY_ALL 3 |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 96 | |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 97 | static int btrfs_log_inode(struct btrfs_trans_handle *trans, |
Filipe Manana | 49dae1b | 2014-09-06 22:34:39 +0100 | [diff] [blame] | 98 | struct btrfs_root *root, struct inode *inode, |
| 99 | int inode_only, |
| 100 | const loff_t start, |
Filipe Manana | 8407f55 | 2014-09-05 15:14:39 +0100 | [diff] [blame] | 101 | const loff_t end, |
| 102 | struct btrfs_log_ctx *ctx); |
Yan Zheng | ec051c0 | 2009-01-05 15:43:42 -0500 | [diff] [blame] | 103 | static int link_to_fixup_dir(struct btrfs_trans_handle *trans, |
| 104 | struct btrfs_root *root, |
| 105 | struct btrfs_path *path, u64 objectid); |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 106 | static noinline int replay_dir_deletes(struct btrfs_trans_handle *trans, |
| 107 | struct btrfs_root *root, |
| 108 | struct btrfs_root *log, |
| 109 | struct btrfs_path *path, |
| 110 | u64 dirid, int del_all); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 111 | |
| 112 | /* |
| 113 | * tree logging is a special write ahead log used to make sure that |
| 114 | * fsyncs and O_SYNCs can happen without doing full tree commits. |
| 115 | * |
| 116 | * Full tree commits are expensive because they require commonly |
| 117 | * modified blocks to be recowed, creating many dirty pages in the |
| 118 | * extent tree an 4x-6x higher write load than ext3. |
| 119 | * |
| 120 | * Instead of doing a tree commit on every fsync, we use the |
| 121 | * key ranges and transaction ids to find items for a given file or directory |
| 122 | * that have changed in this transaction. Those items are copied into |
| 123 | * a special tree (one per subvolume root), that tree is written to disk |
| 124 | * and then the fsync is considered complete. |
| 125 | * |
| 126 | * After a crash, items are copied out of the log-tree back into the |
| 127 | * subvolume tree. Any file data extents found are recorded in the extent |
| 128 | * allocation tree, and the log-tree freed. |
| 129 | * |
| 130 | * The log tree is read three times, once to pin down all the extents it is |
| 131 | * using in ram and once, once to create all the inodes logged in the tree |
| 132 | * and once to do all the other items. |
| 133 | */ |
| 134 | |
| 135 | /* |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 136 | * start a sub transaction and setup the log tree |
| 137 | * this increments the log tree writer count to make the people |
| 138 | * syncing the tree wait for us to finish |
| 139 | */ |
| 140 | static int start_log_trans(struct btrfs_trans_handle *trans, |
Miao Xie | 8b050d3 | 2014-02-20 18:08:58 +0800 | [diff] [blame] | 141 | struct btrfs_root *root, |
| 142 | struct btrfs_log_ctx *ctx) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 143 | { |
Zhaolei | 34eb2a5 | 2015-08-17 18:44:45 +0800 | [diff] [blame] | 144 | int ret = 0; |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 145 | |
| 146 | mutex_lock(&root->log_mutex); |
Zhaolei | 34eb2a5 | 2015-08-17 18:44:45 +0800 | [diff] [blame] | 147 | |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 148 | if (root->log_root) { |
Miao Xie | 995946d | 2014-04-02 19:51:06 +0800 | [diff] [blame] | 149 | if (btrfs_need_log_full_commit(root->fs_info, trans)) { |
Miao Xie | 50471a3 | 2014-02-20 18:08:57 +0800 | [diff] [blame] | 150 | ret = -EAGAIN; |
| 151 | goto out; |
| 152 | } |
Zhaolei | 34eb2a5 | 2015-08-17 18:44:45 +0800 | [diff] [blame] | 153 | |
Josef Bacik | ff782e0 | 2009-10-08 15:30:04 -0400 | [diff] [blame] | 154 | if (!root->log_start_pid) { |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 155 | clear_bit(BTRFS_ROOT_MULTI_LOG_TASKS, &root->state); |
Zhaolei | 34eb2a5 | 2015-08-17 18:44:45 +0800 | [diff] [blame] | 156 | root->log_start_pid = current->pid; |
Josef Bacik | ff782e0 | 2009-10-08 15:30:04 -0400 | [diff] [blame] | 157 | } else if (root->log_start_pid != current->pid) { |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 158 | set_bit(BTRFS_ROOT_MULTI_LOG_TASKS, &root->state); |
Josef Bacik | ff782e0 | 2009-10-08 15:30:04 -0400 | [diff] [blame] | 159 | } |
Zhaolei | 34eb2a5 | 2015-08-17 18:44:45 +0800 | [diff] [blame] | 160 | } else { |
| 161 | mutex_lock(&root->fs_info->tree_log_mutex); |
| 162 | if (!root->fs_info->log_root_tree) |
| 163 | ret = btrfs_init_log_root_tree(trans, root->fs_info); |
| 164 | mutex_unlock(&root->fs_info->tree_log_mutex); |
| 165 | if (ret) |
| 166 | goto out; |
Josef Bacik | ff782e0 | 2009-10-08 15:30:04 -0400 | [diff] [blame] | 167 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 168 | ret = btrfs_add_log_tree(trans, root); |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 169 | if (ret) |
Miao Xie | e87ac13 | 2014-02-20 18:08:53 +0800 | [diff] [blame] | 170 | goto out; |
Zhaolei | 34eb2a5 | 2015-08-17 18:44:45 +0800 | [diff] [blame] | 171 | |
| 172 | clear_bit(BTRFS_ROOT_MULTI_LOG_TASKS, &root->state); |
| 173 | root->log_start_pid = current->pid; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 174 | } |
Zhaolei | 34eb2a5 | 2015-08-17 18:44:45 +0800 | [diff] [blame] | 175 | |
Miao Xie | 2ecb792 | 2012-09-06 04:04:27 -0600 | [diff] [blame] | 176 | atomic_inc(&root->log_batch); |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 177 | atomic_inc(&root->log_writers); |
Miao Xie | 8b050d3 | 2014-02-20 18:08:58 +0800 | [diff] [blame] | 178 | if (ctx) { |
Zhaolei | 34eb2a5 | 2015-08-17 18:44:45 +0800 | [diff] [blame] | 179 | int index = root->log_transid % 2; |
Miao Xie | 8b050d3 | 2014-02-20 18:08:58 +0800 | [diff] [blame] | 180 | list_add_tail(&ctx->list, &root->log_ctxs[index]); |
Miao Xie | d1433de | 2014-02-20 18:08:59 +0800 | [diff] [blame] | 181 | ctx->log_transid = root->log_transid; |
Miao Xie | 8b050d3 | 2014-02-20 18:08:58 +0800 | [diff] [blame] | 182 | } |
Zhaolei | 34eb2a5 | 2015-08-17 18:44:45 +0800 | [diff] [blame] | 183 | |
Miao Xie | e87ac13 | 2014-02-20 18:08:53 +0800 | [diff] [blame] | 184 | out: |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 185 | mutex_unlock(&root->log_mutex); |
Miao Xie | e87ac13 | 2014-02-20 18:08:53 +0800 | [diff] [blame] | 186 | return ret; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 187 | } |
| 188 | |
| 189 | /* |
| 190 | * returns 0 if there was a log transaction running and we were able |
| 191 | * to join, or returns -ENOENT if there were not transactions |
| 192 | * in progress |
| 193 | */ |
| 194 | static int join_running_log_trans(struct btrfs_root *root) |
| 195 | { |
| 196 | int ret = -ENOENT; |
| 197 | |
| 198 | smp_mb(); |
| 199 | if (!root->log_root) |
| 200 | return -ENOENT; |
| 201 | |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 202 | mutex_lock(&root->log_mutex); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 203 | if (root->log_root) { |
| 204 | ret = 0; |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 205 | atomic_inc(&root->log_writers); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 206 | } |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 207 | mutex_unlock(&root->log_mutex); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 208 | return ret; |
| 209 | } |
| 210 | |
| 211 | /* |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 212 | * This either makes the current running log transaction wait |
| 213 | * until you call btrfs_end_log_trans() or it makes any future |
| 214 | * log transactions wait until you call btrfs_end_log_trans() |
| 215 | */ |
| 216 | int btrfs_pin_log_trans(struct btrfs_root *root) |
| 217 | { |
| 218 | int ret = -ENOENT; |
| 219 | |
| 220 | mutex_lock(&root->log_mutex); |
| 221 | atomic_inc(&root->log_writers); |
| 222 | mutex_unlock(&root->log_mutex); |
| 223 | return ret; |
| 224 | } |
| 225 | |
| 226 | /* |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 227 | * indicate we're done making changes to the log tree |
| 228 | * and wake up anyone waiting to do a sync |
| 229 | */ |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 230 | void btrfs_end_log_trans(struct btrfs_root *root) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 231 | { |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 232 | if (atomic_dec_and_test(&root->log_writers)) { |
David Sterba | 779adf0 | 2015-02-16 19:39:00 +0100 | [diff] [blame] | 233 | /* |
| 234 | * Implicit memory barrier after atomic_dec_and_test |
| 235 | */ |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 236 | if (waitqueue_active(&root->log_writer_wait)) |
| 237 | wake_up(&root->log_writer_wait); |
| 238 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 239 | } |
| 240 | |
| 241 | |
| 242 | /* |
| 243 | * the walk control struct is used to pass state down the chain when |
| 244 | * processing the log tree. The stage field tells us which part |
| 245 | * of the log tree processing we are currently doing. The others |
| 246 | * are state fields used for that specific part |
| 247 | */ |
| 248 | struct walk_control { |
| 249 | /* should we free the extent on disk when done? This is used |
| 250 | * at transaction commit time while freeing a log tree |
| 251 | */ |
| 252 | int free; |
| 253 | |
| 254 | /* should we write out the extent buffer? This is used |
| 255 | * while flushing the log tree to disk during a sync |
| 256 | */ |
| 257 | int write; |
| 258 | |
| 259 | /* should we wait for the extent buffer io to finish? Also used |
| 260 | * while flushing the log tree to disk for a sync |
| 261 | */ |
| 262 | int wait; |
| 263 | |
| 264 | /* pin only walk, we record which extents on disk belong to the |
| 265 | * log trees |
| 266 | */ |
| 267 | int pin; |
| 268 | |
| 269 | /* what stage of the replay code we're currently in */ |
| 270 | int stage; |
| 271 | |
| 272 | /* the root we are currently replaying */ |
| 273 | struct btrfs_root *replay_dest; |
| 274 | |
| 275 | /* the trans handle for the current replay */ |
| 276 | struct btrfs_trans_handle *trans; |
| 277 | |
| 278 | /* the function that gets used to process blocks we find in the |
| 279 | * tree. Note the extent_buffer might not be up to date when it is |
| 280 | * passed in, and it must be checked or read if you need the data |
| 281 | * inside it |
| 282 | */ |
| 283 | int (*process_func)(struct btrfs_root *log, struct extent_buffer *eb, |
| 284 | struct walk_control *wc, u64 gen); |
| 285 | }; |
| 286 | |
| 287 | /* |
| 288 | * process_func used to pin down extents, write them or wait on them |
| 289 | */ |
| 290 | static int process_one_buffer(struct btrfs_root *log, |
| 291 | struct extent_buffer *eb, |
| 292 | struct walk_control *wc, u64 gen) |
| 293 | { |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 294 | int ret = 0; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 295 | |
Josef Bacik | 8c2a1a3 | 2013-06-06 13:19:32 -0400 | [diff] [blame] | 296 | /* |
| 297 | * If this fs is mixed then we need to be able to process the leaves to |
| 298 | * pin down any logged extents, so we have to read the block. |
| 299 | */ |
| 300 | if (btrfs_fs_incompat(log->fs_info, MIXED_GROUPS)) { |
| 301 | ret = btrfs_read_buffer(eb, gen); |
| 302 | if (ret) |
| 303 | return ret; |
| 304 | } |
| 305 | |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 306 | if (wc->pin) |
| 307 | ret = btrfs_pin_extent_for_log_replay(log->fs_info->extent_root, |
| 308 | eb->start, eb->len); |
| 309 | |
| 310 | if (!ret && btrfs_buffer_uptodate(eb, gen, 0)) { |
Josef Bacik | 8c2a1a3 | 2013-06-06 13:19:32 -0400 | [diff] [blame] | 311 | if (wc->pin && btrfs_header_level(eb) == 0) |
| 312 | ret = btrfs_exclude_logged_extents(log, eb); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 313 | if (wc->write) |
| 314 | btrfs_write_tree_block(eb); |
| 315 | if (wc->wait) |
| 316 | btrfs_wait_tree_block_writeback(eb); |
| 317 | } |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 318 | return ret; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 319 | } |
| 320 | |
| 321 | /* |
| 322 | * Item overwrite used by replay and tree logging. eb, slot and key all refer |
| 323 | * to the src data we are copying out. |
| 324 | * |
| 325 | * root is the tree we are copying into, and path is a scratch |
| 326 | * path for use in this function (it should be released on entry and |
| 327 | * will be released on exit). |
| 328 | * |
| 329 | * If the key is already in the destination tree the existing item is |
| 330 | * overwritten. If the existing item isn't big enough, it is extended. |
| 331 | * If it is too large, it is truncated. |
| 332 | * |
| 333 | * If the key isn't in the destination yet, a new item is inserted. |
| 334 | */ |
| 335 | static noinline int overwrite_item(struct btrfs_trans_handle *trans, |
| 336 | struct btrfs_root *root, |
| 337 | struct btrfs_path *path, |
| 338 | struct extent_buffer *eb, int slot, |
| 339 | struct btrfs_key *key) |
| 340 | { |
| 341 | int ret; |
| 342 | u32 item_size; |
| 343 | u64 saved_i_size = 0; |
| 344 | int save_old_i_size = 0; |
| 345 | unsigned long src_ptr; |
| 346 | unsigned long dst_ptr; |
| 347 | int overwrite_root = 0; |
Josef Bacik | 4bc4bee | 2013-04-05 20:50:09 +0000 | [diff] [blame] | 348 | bool inode_item = key->type == BTRFS_INODE_ITEM_KEY; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 349 | |
| 350 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) |
| 351 | overwrite_root = 1; |
| 352 | |
| 353 | item_size = btrfs_item_size_nr(eb, slot); |
| 354 | src_ptr = btrfs_item_ptr_offset(eb, slot); |
| 355 | |
| 356 | /* look for the key in the destination tree */ |
| 357 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); |
Josef Bacik | 4bc4bee | 2013-04-05 20:50:09 +0000 | [diff] [blame] | 358 | if (ret < 0) |
| 359 | return ret; |
| 360 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 361 | if (ret == 0) { |
| 362 | char *src_copy; |
| 363 | char *dst_copy; |
| 364 | u32 dst_size = btrfs_item_size_nr(path->nodes[0], |
| 365 | path->slots[0]); |
| 366 | if (dst_size != item_size) |
| 367 | goto insert; |
| 368 | |
| 369 | if (item_size == 0) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 370 | btrfs_release_path(path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 371 | return 0; |
| 372 | } |
| 373 | dst_copy = kmalloc(item_size, GFP_NOFS); |
| 374 | src_copy = kmalloc(item_size, GFP_NOFS); |
liubo | 2a29edc | 2011-01-26 06:22:08 +0000 | [diff] [blame] | 375 | if (!dst_copy || !src_copy) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 376 | btrfs_release_path(path); |
liubo | 2a29edc | 2011-01-26 06:22:08 +0000 | [diff] [blame] | 377 | kfree(dst_copy); |
| 378 | kfree(src_copy); |
| 379 | return -ENOMEM; |
| 380 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 381 | |
| 382 | read_extent_buffer(eb, src_copy, src_ptr, item_size); |
| 383 | |
| 384 | dst_ptr = btrfs_item_ptr_offset(path->nodes[0], path->slots[0]); |
| 385 | read_extent_buffer(path->nodes[0], dst_copy, dst_ptr, |
| 386 | item_size); |
| 387 | ret = memcmp(dst_copy, src_copy, item_size); |
| 388 | |
| 389 | kfree(dst_copy); |
| 390 | kfree(src_copy); |
| 391 | /* |
| 392 | * they have the same contents, just return, this saves |
| 393 | * us from cowing blocks in the destination tree and doing |
| 394 | * extra writes that may not have been done by a previous |
| 395 | * sync |
| 396 | */ |
| 397 | if (ret == 0) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 398 | btrfs_release_path(path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 399 | return 0; |
| 400 | } |
| 401 | |
Josef Bacik | 4bc4bee | 2013-04-05 20:50:09 +0000 | [diff] [blame] | 402 | /* |
| 403 | * We need to load the old nbytes into the inode so when we |
| 404 | * replay the extents we've logged we get the right nbytes. |
| 405 | */ |
| 406 | if (inode_item) { |
| 407 | struct btrfs_inode_item *item; |
| 408 | u64 nbytes; |
Josef Bacik | d555438 | 2013-09-11 14:17:00 -0400 | [diff] [blame] | 409 | u32 mode; |
Josef Bacik | 4bc4bee | 2013-04-05 20:50:09 +0000 | [diff] [blame] | 410 | |
| 411 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
| 412 | struct btrfs_inode_item); |
| 413 | nbytes = btrfs_inode_nbytes(path->nodes[0], item); |
| 414 | item = btrfs_item_ptr(eb, slot, |
| 415 | struct btrfs_inode_item); |
| 416 | btrfs_set_inode_nbytes(eb, item, nbytes); |
Josef Bacik | d555438 | 2013-09-11 14:17:00 -0400 | [diff] [blame] | 417 | |
| 418 | /* |
| 419 | * If this is a directory we need to reset the i_size to |
| 420 | * 0 so that we can set it up properly when replaying |
| 421 | * the rest of the items in this log. |
| 422 | */ |
| 423 | mode = btrfs_inode_mode(eb, item); |
| 424 | if (S_ISDIR(mode)) |
| 425 | btrfs_set_inode_size(eb, item, 0); |
Josef Bacik | 4bc4bee | 2013-04-05 20:50:09 +0000 | [diff] [blame] | 426 | } |
| 427 | } else if (inode_item) { |
| 428 | struct btrfs_inode_item *item; |
Josef Bacik | d555438 | 2013-09-11 14:17:00 -0400 | [diff] [blame] | 429 | u32 mode; |
Josef Bacik | 4bc4bee | 2013-04-05 20:50:09 +0000 | [diff] [blame] | 430 | |
| 431 | /* |
| 432 | * New inode, set nbytes to 0 so that the nbytes comes out |
| 433 | * properly when we replay the extents. |
| 434 | */ |
| 435 | item = btrfs_item_ptr(eb, slot, struct btrfs_inode_item); |
| 436 | btrfs_set_inode_nbytes(eb, item, 0); |
Josef Bacik | d555438 | 2013-09-11 14:17:00 -0400 | [diff] [blame] | 437 | |
| 438 | /* |
| 439 | * If this is a directory we need to reset the i_size to 0 so |
| 440 | * that we can set it up properly when replaying the rest of |
| 441 | * the items in this log. |
| 442 | */ |
| 443 | mode = btrfs_inode_mode(eb, item); |
| 444 | if (S_ISDIR(mode)) |
| 445 | btrfs_set_inode_size(eb, item, 0); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 446 | } |
| 447 | insert: |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 448 | btrfs_release_path(path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 449 | /* try to insert the key into the destination tree */ |
Filipe Manana | df8d116 | 2015-01-14 01:52:25 +0000 | [diff] [blame] | 450 | path->skip_release_on_error = 1; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 451 | ret = btrfs_insert_empty_item(trans, root, path, |
| 452 | key, item_size); |
Filipe Manana | df8d116 | 2015-01-14 01:52:25 +0000 | [diff] [blame] | 453 | path->skip_release_on_error = 0; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 454 | |
| 455 | /* make sure any existing item is the correct size */ |
Filipe Manana | df8d116 | 2015-01-14 01:52:25 +0000 | [diff] [blame] | 456 | if (ret == -EEXIST || ret == -EOVERFLOW) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 457 | u32 found_size; |
| 458 | found_size = btrfs_item_size_nr(path->nodes[0], |
| 459 | path->slots[0]); |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 460 | if (found_size > item_size) |
Tsutomu Itoh | afe5fea | 2013-04-16 05:18:22 +0000 | [diff] [blame] | 461 | btrfs_truncate_item(root, path, item_size, 1); |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 462 | else if (found_size < item_size) |
Tsutomu Itoh | 4b90c68 | 2013-04-16 05:18:49 +0000 | [diff] [blame] | 463 | btrfs_extend_item(root, path, |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 464 | item_size - found_size); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 465 | } else if (ret) { |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 466 | return ret; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 467 | } |
| 468 | dst_ptr = btrfs_item_ptr_offset(path->nodes[0], |
| 469 | path->slots[0]); |
| 470 | |
| 471 | /* don't overwrite an existing inode if the generation number |
| 472 | * was logged as zero. This is done when the tree logging code |
| 473 | * is just logging an inode to make sure it exists after recovery. |
| 474 | * |
| 475 | * Also, don't overwrite i_size on directories during replay. |
| 476 | * log replay inserts and removes directory items based on the |
| 477 | * state of the tree found in the subvolume, and i_size is modified |
| 478 | * as it goes |
| 479 | */ |
| 480 | if (key->type == BTRFS_INODE_ITEM_KEY && ret == -EEXIST) { |
| 481 | struct btrfs_inode_item *src_item; |
| 482 | struct btrfs_inode_item *dst_item; |
| 483 | |
| 484 | src_item = (struct btrfs_inode_item *)src_ptr; |
| 485 | dst_item = (struct btrfs_inode_item *)dst_ptr; |
| 486 | |
Filipe Manana | 1a4bcf4 | 2015-02-13 12:30:56 +0000 | [diff] [blame] | 487 | if (btrfs_inode_generation(eb, src_item) == 0) { |
| 488 | struct extent_buffer *dst_eb = path->nodes[0]; |
Filipe Manana | 2f2ff0e | 2015-03-20 17:19:46 +0000 | [diff] [blame] | 489 | const u64 ino_size = btrfs_inode_size(eb, src_item); |
Filipe Manana | 1a4bcf4 | 2015-02-13 12:30:56 +0000 | [diff] [blame] | 490 | |
Filipe Manana | 2f2ff0e | 2015-03-20 17:19:46 +0000 | [diff] [blame] | 491 | /* |
| 492 | * For regular files an ino_size == 0 is used only when |
| 493 | * logging that an inode exists, as part of a directory |
| 494 | * fsync, and the inode wasn't fsynced before. In this |
| 495 | * case don't set the size of the inode in the fs/subvol |
| 496 | * tree, otherwise we would be throwing valid data away. |
| 497 | */ |
Filipe Manana | 1a4bcf4 | 2015-02-13 12:30:56 +0000 | [diff] [blame] | 498 | if (S_ISREG(btrfs_inode_mode(eb, src_item)) && |
Filipe Manana | 2f2ff0e | 2015-03-20 17:19:46 +0000 | [diff] [blame] | 499 | S_ISREG(btrfs_inode_mode(dst_eb, dst_item)) && |
| 500 | ino_size != 0) { |
Filipe Manana | 1a4bcf4 | 2015-02-13 12:30:56 +0000 | [diff] [blame] | 501 | struct btrfs_map_token token; |
Filipe Manana | 1a4bcf4 | 2015-02-13 12:30:56 +0000 | [diff] [blame] | 502 | |
| 503 | btrfs_init_map_token(&token); |
| 504 | btrfs_set_token_inode_size(dst_eb, dst_item, |
| 505 | ino_size, &token); |
| 506 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 507 | goto no_copy; |
Filipe Manana | 1a4bcf4 | 2015-02-13 12:30:56 +0000 | [diff] [blame] | 508 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 509 | |
| 510 | if (overwrite_root && |
| 511 | S_ISDIR(btrfs_inode_mode(eb, src_item)) && |
| 512 | S_ISDIR(btrfs_inode_mode(path->nodes[0], dst_item))) { |
| 513 | save_old_i_size = 1; |
| 514 | saved_i_size = btrfs_inode_size(path->nodes[0], |
| 515 | dst_item); |
| 516 | } |
| 517 | } |
| 518 | |
| 519 | copy_extent_buffer(path->nodes[0], eb, dst_ptr, |
| 520 | src_ptr, item_size); |
| 521 | |
| 522 | if (save_old_i_size) { |
| 523 | struct btrfs_inode_item *dst_item; |
| 524 | dst_item = (struct btrfs_inode_item *)dst_ptr; |
| 525 | btrfs_set_inode_size(path->nodes[0], dst_item, saved_i_size); |
| 526 | } |
| 527 | |
| 528 | /* make sure the generation is filled in */ |
| 529 | if (key->type == BTRFS_INODE_ITEM_KEY) { |
| 530 | struct btrfs_inode_item *dst_item; |
| 531 | dst_item = (struct btrfs_inode_item *)dst_ptr; |
| 532 | if (btrfs_inode_generation(path->nodes[0], dst_item) == 0) { |
| 533 | btrfs_set_inode_generation(path->nodes[0], dst_item, |
| 534 | trans->transid); |
| 535 | } |
| 536 | } |
| 537 | no_copy: |
| 538 | btrfs_mark_buffer_dirty(path->nodes[0]); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 539 | btrfs_release_path(path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 540 | return 0; |
| 541 | } |
| 542 | |
| 543 | /* |
| 544 | * simple helper to read an inode off the disk from a given root |
| 545 | * This can only be called for subvolume roots and not for the log |
| 546 | */ |
| 547 | static noinline struct inode *read_one_inode(struct btrfs_root *root, |
| 548 | u64 objectid) |
| 549 | { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 550 | struct btrfs_key key; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 551 | struct inode *inode; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 552 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 553 | key.objectid = objectid; |
| 554 | key.type = BTRFS_INODE_ITEM_KEY; |
| 555 | key.offset = 0; |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 556 | inode = btrfs_iget(root->fs_info->sb, &key, root, NULL); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 557 | if (IS_ERR(inode)) { |
| 558 | inode = NULL; |
| 559 | } else if (is_bad_inode(inode)) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 560 | iput(inode); |
| 561 | inode = NULL; |
| 562 | } |
| 563 | return inode; |
| 564 | } |
| 565 | |
| 566 | /* replays a single extent in 'eb' at 'slot' with 'key' into the |
| 567 | * subvolume 'root'. path is released on entry and should be released |
| 568 | * on exit. |
| 569 | * |
| 570 | * extents in the log tree have not been allocated out of the extent |
| 571 | * tree yet. So, this completes the allocation, taking a reference |
| 572 | * as required if the extent already exists or creating a new extent |
| 573 | * if it isn't in the extent allocation tree yet. |
| 574 | * |
| 575 | * The extent is inserted into the file, dropping any existing extents |
| 576 | * from the file that overlap the new one. |
| 577 | */ |
| 578 | static noinline int replay_one_extent(struct btrfs_trans_handle *trans, |
| 579 | struct btrfs_root *root, |
| 580 | struct btrfs_path *path, |
| 581 | struct extent_buffer *eb, int slot, |
| 582 | struct btrfs_key *key) |
| 583 | { |
| 584 | int found_type; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 585 | u64 extent_end; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 586 | u64 start = key->offset; |
Josef Bacik | 4bc4bee | 2013-04-05 20:50:09 +0000 | [diff] [blame] | 587 | u64 nbytes = 0; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 588 | struct btrfs_file_extent_item *item; |
| 589 | struct inode *inode = NULL; |
| 590 | unsigned long size; |
| 591 | int ret = 0; |
| 592 | |
| 593 | item = btrfs_item_ptr(eb, slot, struct btrfs_file_extent_item); |
| 594 | found_type = btrfs_file_extent_type(eb, item); |
| 595 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 596 | if (found_type == BTRFS_FILE_EXTENT_REG || |
Josef Bacik | 4bc4bee | 2013-04-05 20:50:09 +0000 | [diff] [blame] | 597 | found_type == BTRFS_FILE_EXTENT_PREALLOC) { |
| 598 | nbytes = btrfs_file_extent_num_bytes(eb, item); |
| 599 | extent_end = start + nbytes; |
| 600 | |
| 601 | /* |
| 602 | * We don't add to the inodes nbytes if we are prealloc or a |
| 603 | * hole. |
| 604 | */ |
| 605 | if (btrfs_file_extent_disk_bytenr(eb, item) == 0) |
| 606 | nbytes = 0; |
| 607 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { |
Chris Mason | 514ac8a | 2014-01-03 21:07:00 -0800 | [diff] [blame] | 608 | size = btrfs_file_extent_inline_len(eb, slot, item); |
Josef Bacik | 4bc4bee | 2013-04-05 20:50:09 +0000 | [diff] [blame] | 609 | nbytes = btrfs_file_extent_ram_bytes(eb, item); |
Qu Wenruo | fda2832 | 2013-02-26 08:10:22 +0000 | [diff] [blame] | 610 | extent_end = ALIGN(start + size, root->sectorsize); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 611 | } else { |
| 612 | ret = 0; |
| 613 | goto out; |
| 614 | } |
| 615 | |
| 616 | inode = read_one_inode(root, key->objectid); |
| 617 | if (!inode) { |
| 618 | ret = -EIO; |
| 619 | goto out; |
| 620 | } |
| 621 | |
| 622 | /* |
| 623 | * first check to see if we already have this extent in the |
| 624 | * file. This must be done before the btrfs_drop_extents run |
| 625 | * so we don't try to drop this extent. |
| 626 | */ |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 627 | ret = btrfs_lookup_file_extent(trans, root, path, btrfs_ino(inode), |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 628 | start, 0); |
| 629 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 630 | if (ret == 0 && |
| 631 | (found_type == BTRFS_FILE_EXTENT_REG || |
| 632 | found_type == BTRFS_FILE_EXTENT_PREALLOC)) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 633 | struct btrfs_file_extent_item cmp1; |
| 634 | struct btrfs_file_extent_item cmp2; |
| 635 | struct btrfs_file_extent_item *existing; |
| 636 | struct extent_buffer *leaf; |
| 637 | |
| 638 | leaf = path->nodes[0]; |
| 639 | existing = btrfs_item_ptr(leaf, path->slots[0], |
| 640 | struct btrfs_file_extent_item); |
| 641 | |
| 642 | read_extent_buffer(eb, &cmp1, (unsigned long)item, |
| 643 | sizeof(cmp1)); |
| 644 | read_extent_buffer(leaf, &cmp2, (unsigned long)existing, |
| 645 | sizeof(cmp2)); |
| 646 | |
| 647 | /* |
| 648 | * we already have a pointer to this exact extent, |
| 649 | * we don't have to do anything |
| 650 | */ |
| 651 | if (memcmp(&cmp1, &cmp2, sizeof(cmp1)) == 0) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 652 | btrfs_release_path(path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 653 | goto out; |
| 654 | } |
| 655 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 656 | btrfs_release_path(path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 657 | |
| 658 | /* drop any overlapping extents */ |
Josef Bacik | 2671485 | 2012-08-29 12:24:27 -0400 | [diff] [blame] | 659 | ret = btrfs_drop_extents(trans, root, inode, start, extent_end, 1); |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 660 | if (ret) |
| 661 | goto out; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 662 | |
Yan Zheng | 07d400a | 2009-01-06 11:42:00 -0500 | [diff] [blame] | 663 | if (found_type == BTRFS_FILE_EXTENT_REG || |
| 664 | found_type == BTRFS_FILE_EXTENT_PREALLOC) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 665 | u64 offset; |
Yan Zheng | 07d400a | 2009-01-06 11:42:00 -0500 | [diff] [blame] | 666 | unsigned long dest_offset; |
| 667 | struct btrfs_key ins; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 668 | |
Yan Zheng | 07d400a | 2009-01-06 11:42:00 -0500 | [diff] [blame] | 669 | ret = btrfs_insert_empty_item(trans, root, path, key, |
| 670 | sizeof(*item)); |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 671 | if (ret) |
| 672 | goto out; |
Yan Zheng | 07d400a | 2009-01-06 11:42:00 -0500 | [diff] [blame] | 673 | dest_offset = btrfs_item_ptr_offset(path->nodes[0], |
| 674 | path->slots[0]); |
| 675 | copy_extent_buffer(path->nodes[0], eb, dest_offset, |
| 676 | (unsigned long)item, sizeof(*item)); |
| 677 | |
| 678 | ins.objectid = btrfs_file_extent_disk_bytenr(eb, item); |
| 679 | ins.offset = btrfs_file_extent_disk_num_bytes(eb, item); |
| 680 | ins.type = BTRFS_EXTENT_ITEM_KEY; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 681 | offset = key->offset - btrfs_file_extent_offset(eb, item); |
Yan Zheng | 07d400a | 2009-01-06 11:42:00 -0500 | [diff] [blame] | 682 | |
| 683 | if (ins.objectid > 0) { |
| 684 | u64 csum_start; |
| 685 | u64 csum_end; |
| 686 | LIST_HEAD(ordered_sums); |
| 687 | /* |
| 688 | * is this extent already allocated in the extent |
| 689 | * allocation tree? If so, just add a reference |
| 690 | */ |
Filipe Manana | 1a4ed8f | 2014-10-27 10:44:24 +0000 | [diff] [blame] | 691 | ret = btrfs_lookup_data_extent(root, ins.objectid, |
Yan Zheng | 07d400a | 2009-01-06 11:42:00 -0500 | [diff] [blame] | 692 | ins.offset); |
| 693 | if (ret == 0) { |
| 694 | ret = btrfs_inc_extent_ref(trans, root, |
| 695 | ins.objectid, ins.offset, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 696 | 0, root->root_key.objectid, |
Filipe Manana | b06c4bf | 2015-10-23 07:52:54 +0100 | [diff] [blame] | 697 | key->objectid, offset); |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 698 | if (ret) |
| 699 | goto out; |
Yan Zheng | 07d400a | 2009-01-06 11:42:00 -0500 | [diff] [blame] | 700 | } else { |
| 701 | /* |
| 702 | * insert the extent pointer in the extent |
| 703 | * allocation tree |
| 704 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 705 | ret = btrfs_alloc_logged_file_extent(trans, |
| 706 | root, root->root_key.objectid, |
| 707 | key->objectid, offset, &ins); |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 708 | if (ret) |
| 709 | goto out; |
Yan Zheng | 07d400a | 2009-01-06 11:42:00 -0500 | [diff] [blame] | 710 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 711 | btrfs_release_path(path); |
Yan Zheng | 07d400a | 2009-01-06 11:42:00 -0500 | [diff] [blame] | 712 | |
| 713 | if (btrfs_file_extent_compression(eb, item)) { |
| 714 | csum_start = ins.objectid; |
| 715 | csum_end = csum_start + ins.offset; |
| 716 | } else { |
| 717 | csum_start = ins.objectid + |
| 718 | btrfs_file_extent_offset(eb, item); |
| 719 | csum_end = csum_start + |
| 720 | btrfs_file_extent_num_bytes(eb, item); |
| 721 | } |
| 722 | |
| 723 | ret = btrfs_lookup_csums_range(root->log_root, |
| 724 | csum_start, csum_end - 1, |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 725 | &ordered_sums, 0); |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 726 | if (ret) |
| 727 | goto out; |
Filipe Manana | b84b839 | 2015-08-19 11:09:40 +0100 | [diff] [blame] | 728 | /* |
| 729 | * Now delete all existing cums in the csum root that |
| 730 | * cover our range. We do this because we can have an |
| 731 | * extent that is completely referenced by one file |
| 732 | * extent item and partially referenced by another |
| 733 | * file extent item (like after using the clone or |
| 734 | * extent_same ioctls). In this case if we end up doing |
| 735 | * the replay of the one that partially references the |
| 736 | * extent first, and we do not do the csum deletion |
| 737 | * below, we can get 2 csum items in the csum tree that |
| 738 | * overlap each other. For example, imagine our log has |
| 739 | * the two following file extent items: |
| 740 | * |
| 741 | * key (257 EXTENT_DATA 409600) |
| 742 | * extent data disk byte 12845056 nr 102400 |
| 743 | * extent data offset 20480 nr 20480 ram 102400 |
| 744 | * |
| 745 | * key (257 EXTENT_DATA 819200) |
| 746 | * extent data disk byte 12845056 nr 102400 |
| 747 | * extent data offset 0 nr 102400 ram 102400 |
| 748 | * |
| 749 | * Where the second one fully references the 100K extent |
| 750 | * that starts at disk byte 12845056, and the log tree |
| 751 | * has a single csum item that covers the entire range |
| 752 | * of the extent: |
| 753 | * |
| 754 | * key (EXTENT_CSUM EXTENT_CSUM 12845056) itemsize 100 |
| 755 | * |
| 756 | * After the first file extent item is replayed, the |
| 757 | * csum tree gets the following csum item: |
| 758 | * |
| 759 | * key (EXTENT_CSUM EXTENT_CSUM 12865536) itemsize 20 |
| 760 | * |
| 761 | * Which covers the 20K sub-range starting at offset 20K |
| 762 | * of our extent. Now when we replay the second file |
| 763 | * extent item, if we do not delete existing csum items |
| 764 | * that cover any of its blocks, we end up getting two |
| 765 | * csum items in our csum tree that overlap each other: |
| 766 | * |
| 767 | * key (EXTENT_CSUM EXTENT_CSUM 12845056) itemsize 100 |
| 768 | * key (EXTENT_CSUM EXTENT_CSUM 12865536) itemsize 20 |
| 769 | * |
| 770 | * Which is a problem, because after this anyone trying |
| 771 | * to lookup up for the checksum of any block of our |
| 772 | * extent starting at an offset of 40K or higher, will |
| 773 | * end up looking at the second csum item only, which |
| 774 | * does not contain the checksum for any block starting |
| 775 | * at offset 40K or higher of our extent. |
| 776 | */ |
Yan Zheng | 07d400a | 2009-01-06 11:42:00 -0500 | [diff] [blame] | 777 | while (!list_empty(&ordered_sums)) { |
| 778 | struct btrfs_ordered_sum *sums; |
| 779 | sums = list_entry(ordered_sums.next, |
| 780 | struct btrfs_ordered_sum, |
| 781 | list); |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 782 | if (!ret) |
Filipe Manana | b84b839 | 2015-08-19 11:09:40 +0100 | [diff] [blame] | 783 | ret = btrfs_del_csums(trans, |
| 784 | root->fs_info->csum_root, |
| 785 | sums->bytenr, |
| 786 | sums->len); |
| 787 | if (!ret) |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 788 | ret = btrfs_csum_file_blocks(trans, |
Yan Zheng | 07d400a | 2009-01-06 11:42:00 -0500 | [diff] [blame] | 789 | root->fs_info->csum_root, |
| 790 | sums); |
Yan Zheng | 07d400a | 2009-01-06 11:42:00 -0500 | [diff] [blame] | 791 | list_del(&sums->list); |
| 792 | kfree(sums); |
| 793 | } |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 794 | if (ret) |
| 795 | goto out; |
Yan Zheng | 07d400a | 2009-01-06 11:42:00 -0500 | [diff] [blame] | 796 | } else { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 797 | btrfs_release_path(path); |
Yan Zheng | 07d400a | 2009-01-06 11:42:00 -0500 | [diff] [blame] | 798 | } |
| 799 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { |
| 800 | /* inline extents are easy, we just overwrite them */ |
| 801 | ret = overwrite_item(trans, root, path, eb, slot, key); |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 802 | if (ret) |
| 803 | goto out; |
Yan Zheng | 07d400a | 2009-01-06 11:42:00 -0500 | [diff] [blame] | 804 | } |
| 805 | |
Josef Bacik | 4bc4bee | 2013-04-05 20:50:09 +0000 | [diff] [blame] | 806 | inode_add_bytes(inode, nbytes); |
Tsutomu Itoh | b995929 | 2012-06-25 21:25:22 -0600 | [diff] [blame] | 807 | ret = btrfs_update_inode(trans, root, inode); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 808 | out: |
| 809 | if (inode) |
| 810 | iput(inode); |
| 811 | return ret; |
| 812 | } |
| 813 | |
| 814 | /* |
| 815 | * when cleaning up conflicts between the directory names in the |
| 816 | * subvolume, directory names in the log and directory names in the |
| 817 | * inode back references, we may have to unlink inodes from directories. |
| 818 | * |
| 819 | * This is a helper function to do the unlink of a specific directory |
| 820 | * item |
| 821 | */ |
| 822 | static noinline int drop_one_dir_item(struct btrfs_trans_handle *trans, |
| 823 | struct btrfs_root *root, |
| 824 | struct btrfs_path *path, |
| 825 | struct inode *dir, |
| 826 | struct btrfs_dir_item *di) |
| 827 | { |
| 828 | struct inode *inode; |
| 829 | char *name; |
| 830 | int name_len; |
| 831 | struct extent_buffer *leaf; |
| 832 | struct btrfs_key location; |
| 833 | int ret; |
| 834 | |
| 835 | leaf = path->nodes[0]; |
| 836 | |
| 837 | btrfs_dir_item_key_to_cpu(leaf, di, &location); |
| 838 | name_len = btrfs_dir_name_len(leaf, di); |
| 839 | name = kmalloc(name_len, GFP_NOFS); |
liubo | 2a29edc | 2011-01-26 06:22:08 +0000 | [diff] [blame] | 840 | if (!name) |
| 841 | return -ENOMEM; |
| 842 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 843 | read_extent_buffer(leaf, name, (unsigned long)(di + 1), name_len); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 844 | btrfs_release_path(path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 845 | |
| 846 | inode = read_one_inode(root, location.objectid); |
Tsutomu Itoh | c00e949 | 2011-04-28 09:10:23 +0000 | [diff] [blame] | 847 | if (!inode) { |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 848 | ret = -EIO; |
| 849 | goto out; |
Tsutomu Itoh | c00e949 | 2011-04-28 09:10:23 +0000 | [diff] [blame] | 850 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 851 | |
Yan Zheng | ec051c0 | 2009-01-05 15:43:42 -0500 | [diff] [blame] | 852 | ret = link_to_fixup_dir(trans, root, path, location.objectid); |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 853 | if (ret) |
| 854 | goto out; |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 855 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 856 | ret = btrfs_unlink_inode(trans, root, dir, inode, name, name_len); |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 857 | if (ret) |
| 858 | goto out; |
Filipe David Borba Manana | ada9af2 | 2013-08-05 09:25:47 +0100 | [diff] [blame] | 859 | else |
| 860 | ret = btrfs_run_delayed_items(trans, root); |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 861 | out: |
| 862 | kfree(name); |
| 863 | iput(inode); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 864 | return ret; |
| 865 | } |
| 866 | |
| 867 | /* |
| 868 | * helper function to see if a given name and sequence number found |
| 869 | * in an inode back reference are already in a directory and correctly |
| 870 | * point to this inode |
| 871 | */ |
| 872 | static noinline int inode_in_dir(struct btrfs_root *root, |
| 873 | struct btrfs_path *path, |
| 874 | u64 dirid, u64 objectid, u64 index, |
| 875 | const char *name, int name_len) |
| 876 | { |
| 877 | struct btrfs_dir_item *di; |
| 878 | struct btrfs_key location; |
| 879 | int match = 0; |
| 880 | |
| 881 | di = btrfs_lookup_dir_index_item(NULL, root, path, dirid, |
| 882 | index, name, name_len, 0); |
| 883 | if (di && !IS_ERR(di)) { |
| 884 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); |
| 885 | if (location.objectid != objectid) |
| 886 | goto out; |
| 887 | } else |
| 888 | goto out; |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 889 | btrfs_release_path(path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 890 | |
| 891 | di = btrfs_lookup_dir_item(NULL, root, path, dirid, name, name_len, 0); |
| 892 | if (di && !IS_ERR(di)) { |
| 893 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); |
| 894 | if (location.objectid != objectid) |
| 895 | goto out; |
| 896 | } else |
| 897 | goto out; |
| 898 | match = 1; |
| 899 | out: |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 900 | btrfs_release_path(path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 901 | return match; |
| 902 | } |
| 903 | |
| 904 | /* |
| 905 | * helper function to check a log tree for a named back reference in |
| 906 | * an inode. This is used to decide if a back reference that is |
| 907 | * found in the subvolume conflicts with what we find in the log. |
| 908 | * |
| 909 | * inode backreferences may have multiple refs in a single item, |
| 910 | * during replay we process one reference at a time, and we don't |
| 911 | * want to delete valid links to a file from the subvolume if that |
| 912 | * link is also in the log. |
| 913 | */ |
| 914 | static noinline int backref_in_log(struct btrfs_root *log, |
| 915 | struct btrfs_key *key, |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 916 | u64 ref_objectid, |
Filipe Manana | df8d116 | 2015-01-14 01:52:25 +0000 | [diff] [blame] | 917 | const char *name, int namelen) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 918 | { |
| 919 | struct btrfs_path *path; |
| 920 | struct btrfs_inode_ref *ref; |
| 921 | unsigned long ptr; |
| 922 | unsigned long ptr_end; |
| 923 | unsigned long name_ptr; |
| 924 | int found_name_len; |
| 925 | int item_size; |
| 926 | int ret; |
| 927 | int match = 0; |
| 928 | |
| 929 | path = btrfs_alloc_path(); |
liubo | 2a29edc | 2011-01-26 06:22:08 +0000 | [diff] [blame] | 930 | if (!path) |
| 931 | return -ENOMEM; |
| 932 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 933 | ret = btrfs_search_slot(NULL, log, key, path, 0, 0); |
| 934 | if (ret != 0) |
| 935 | goto out; |
| 936 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 937 | ptr = btrfs_item_ptr_offset(path->nodes[0], path->slots[0]); |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 938 | |
| 939 | if (key->type == BTRFS_INODE_EXTREF_KEY) { |
| 940 | if (btrfs_find_name_in_ext_backref(path, ref_objectid, |
| 941 | name, namelen, NULL)) |
| 942 | match = 1; |
| 943 | |
| 944 | goto out; |
| 945 | } |
| 946 | |
| 947 | item_size = btrfs_item_size_nr(path->nodes[0], path->slots[0]); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 948 | ptr_end = ptr + item_size; |
| 949 | while (ptr < ptr_end) { |
| 950 | ref = (struct btrfs_inode_ref *)ptr; |
| 951 | found_name_len = btrfs_inode_ref_name_len(path->nodes[0], ref); |
| 952 | if (found_name_len == namelen) { |
| 953 | name_ptr = (unsigned long)(ref + 1); |
| 954 | ret = memcmp_extent_buffer(path->nodes[0], name, |
| 955 | name_ptr, namelen); |
| 956 | if (ret == 0) { |
| 957 | match = 1; |
| 958 | goto out; |
| 959 | } |
| 960 | } |
| 961 | ptr = (unsigned long)(ref + 1) + found_name_len; |
| 962 | } |
| 963 | out: |
| 964 | btrfs_free_path(path); |
| 965 | return match; |
| 966 | } |
| 967 | |
Jan Schmidt | 5a1d784 | 2012-08-17 14:04:41 -0700 | [diff] [blame] | 968 | static inline int __add_inode_ref(struct btrfs_trans_handle *trans, |
| 969 | struct btrfs_root *root, |
| 970 | struct btrfs_path *path, |
| 971 | struct btrfs_root *log_root, |
| 972 | struct inode *dir, struct inode *inode, |
Jan Schmidt | 5a1d784 | 2012-08-17 14:04:41 -0700 | [diff] [blame] | 973 | struct extent_buffer *eb, |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 974 | u64 inode_objectid, u64 parent_objectid, |
| 975 | u64 ref_index, char *name, int namelen, |
| 976 | int *search_done) |
Jan Schmidt | 5a1d784 | 2012-08-17 14:04:41 -0700 | [diff] [blame] | 977 | { |
| 978 | int ret; |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 979 | char *victim_name; |
| 980 | int victim_name_len; |
| 981 | struct extent_buffer *leaf; |
Jan Schmidt | 5a1d784 | 2012-08-17 14:04:41 -0700 | [diff] [blame] | 982 | struct btrfs_dir_item *di; |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 983 | struct btrfs_key search_key; |
| 984 | struct btrfs_inode_extref *extref; |
Jan Schmidt | 5a1d784 | 2012-08-17 14:04:41 -0700 | [diff] [blame] | 985 | |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 986 | again: |
| 987 | /* Search old style refs */ |
| 988 | search_key.objectid = inode_objectid; |
| 989 | search_key.type = BTRFS_INODE_REF_KEY; |
| 990 | search_key.offset = parent_objectid; |
| 991 | ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0); |
Jan Schmidt | 5a1d784 | 2012-08-17 14:04:41 -0700 | [diff] [blame] | 992 | if (ret == 0) { |
Jan Schmidt | 5a1d784 | 2012-08-17 14:04:41 -0700 | [diff] [blame] | 993 | struct btrfs_inode_ref *victim_ref; |
| 994 | unsigned long ptr; |
| 995 | unsigned long ptr_end; |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 996 | |
| 997 | leaf = path->nodes[0]; |
Jan Schmidt | 5a1d784 | 2012-08-17 14:04:41 -0700 | [diff] [blame] | 998 | |
| 999 | /* are we trying to overwrite a back ref for the root directory |
| 1000 | * if so, just jump out, we're done |
| 1001 | */ |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 1002 | if (search_key.objectid == search_key.offset) |
Jan Schmidt | 5a1d784 | 2012-08-17 14:04:41 -0700 | [diff] [blame] | 1003 | return 1; |
| 1004 | |
| 1005 | /* check all the names in this back reference to see |
| 1006 | * if they are in the log. if so, we allow them to stay |
| 1007 | * otherwise they must be unlinked as a conflict |
| 1008 | */ |
| 1009 | ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); |
| 1010 | ptr_end = ptr + btrfs_item_size_nr(leaf, path->slots[0]); |
| 1011 | while (ptr < ptr_end) { |
| 1012 | victim_ref = (struct btrfs_inode_ref *)ptr; |
| 1013 | victim_name_len = btrfs_inode_ref_name_len(leaf, |
| 1014 | victim_ref); |
| 1015 | victim_name = kmalloc(victim_name_len, GFP_NOFS); |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 1016 | if (!victim_name) |
| 1017 | return -ENOMEM; |
Jan Schmidt | 5a1d784 | 2012-08-17 14:04:41 -0700 | [diff] [blame] | 1018 | |
| 1019 | read_extent_buffer(leaf, victim_name, |
| 1020 | (unsigned long)(victim_ref + 1), |
| 1021 | victim_name_len); |
| 1022 | |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 1023 | if (!backref_in_log(log_root, &search_key, |
| 1024 | parent_objectid, |
| 1025 | victim_name, |
Jan Schmidt | 5a1d784 | 2012-08-17 14:04:41 -0700 | [diff] [blame] | 1026 | victim_name_len)) { |
Zach Brown | 8b558c5 | 2013-10-16 12:10:34 -0700 | [diff] [blame] | 1027 | inc_nlink(inode); |
Jan Schmidt | 5a1d784 | 2012-08-17 14:04:41 -0700 | [diff] [blame] | 1028 | btrfs_release_path(path); |
| 1029 | |
| 1030 | ret = btrfs_unlink_inode(trans, root, dir, |
| 1031 | inode, victim_name, |
| 1032 | victim_name_len); |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 1033 | kfree(victim_name); |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 1034 | if (ret) |
| 1035 | return ret; |
Filipe David Borba Manana | ada9af2 | 2013-08-05 09:25:47 +0100 | [diff] [blame] | 1036 | ret = btrfs_run_delayed_items(trans, root); |
| 1037 | if (ret) |
| 1038 | return ret; |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 1039 | *search_done = 1; |
| 1040 | goto again; |
Jan Schmidt | 5a1d784 | 2012-08-17 14:04:41 -0700 | [diff] [blame] | 1041 | } |
| 1042 | kfree(victim_name); |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 1043 | |
Jan Schmidt | 5a1d784 | 2012-08-17 14:04:41 -0700 | [diff] [blame] | 1044 | ptr = (unsigned long)(victim_ref + 1) + victim_name_len; |
| 1045 | } |
Jan Schmidt | 5a1d784 | 2012-08-17 14:04:41 -0700 | [diff] [blame] | 1046 | |
| 1047 | /* |
| 1048 | * NOTE: we have searched root tree and checked the |
Adam Buchbinder | bb7ab3b | 2016-03-04 11:23:12 -0800 | [diff] [blame] | 1049 | * corresponding ref, it does not need to check again. |
Jan Schmidt | 5a1d784 | 2012-08-17 14:04:41 -0700 | [diff] [blame] | 1050 | */ |
| 1051 | *search_done = 1; |
| 1052 | } |
| 1053 | btrfs_release_path(path); |
| 1054 | |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 1055 | /* Same search but for extended refs */ |
| 1056 | extref = btrfs_lookup_inode_extref(NULL, root, path, name, namelen, |
| 1057 | inode_objectid, parent_objectid, 0, |
| 1058 | 0); |
| 1059 | if (!IS_ERR_OR_NULL(extref)) { |
| 1060 | u32 item_size; |
| 1061 | u32 cur_offset = 0; |
| 1062 | unsigned long base; |
| 1063 | struct inode *victim_parent; |
| 1064 | |
| 1065 | leaf = path->nodes[0]; |
| 1066 | |
| 1067 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); |
| 1068 | base = btrfs_item_ptr_offset(leaf, path->slots[0]); |
| 1069 | |
| 1070 | while (cur_offset < item_size) { |
Quentin Casasnovas | dd9ef13 | 2015-03-03 16:31:38 +0100 | [diff] [blame] | 1071 | extref = (struct btrfs_inode_extref *)(base + cur_offset); |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 1072 | |
| 1073 | victim_name_len = btrfs_inode_extref_name_len(leaf, extref); |
| 1074 | |
| 1075 | if (btrfs_inode_extref_parent(leaf, extref) != parent_objectid) |
| 1076 | goto next; |
| 1077 | |
| 1078 | victim_name = kmalloc(victim_name_len, GFP_NOFS); |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 1079 | if (!victim_name) |
| 1080 | return -ENOMEM; |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 1081 | read_extent_buffer(leaf, victim_name, (unsigned long)&extref->name, |
| 1082 | victim_name_len); |
| 1083 | |
| 1084 | search_key.objectid = inode_objectid; |
| 1085 | search_key.type = BTRFS_INODE_EXTREF_KEY; |
| 1086 | search_key.offset = btrfs_extref_hash(parent_objectid, |
| 1087 | victim_name, |
| 1088 | victim_name_len); |
| 1089 | ret = 0; |
| 1090 | if (!backref_in_log(log_root, &search_key, |
| 1091 | parent_objectid, victim_name, |
| 1092 | victim_name_len)) { |
| 1093 | ret = -ENOENT; |
| 1094 | victim_parent = read_one_inode(root, |
| 1095 | parent_objectid); |
| 1096 | if (victim_parent) { |
Zach Brown | 8b558c5 | 2013-10-16 12:10:34 -0700 | [diff] [blame] | 1097 | inc_nlink(inode); |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 1098 | btrfs_release_path(path); |
| 1099 | |
| 1100 | ret = btrfs_unlink_inode(trans, root, |
| 1101 | victim_parent, |
| 1102 | inode, |
| 1103 | victim_name, |
| 1104 | victim_name_len); |
Filipe David Borba Manana | ada9af2 | 2013-08-05 09:25:47 +0100 | [diff] [blame] | 1105 | if (!ret) |
| 1106 | ret = btrfs_run_delayed_items( |
| 1107 | trans, root); |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 1108 | } |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 1109 | iput(victim_parent); |
| 1110 | kfree(victim_name); |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 1111 | if (ret) |
| 1112 | return ret; |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 1113 | *search_done = 1; |
| 1114 | goto again; |
| 1115 | } |
| 1116 | kfree(victim_name); |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 1117 | if (ret) |
| 1118 | return ret; |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 1119 | next: |
| 1120 | cur_offset += victim_name_len + sizeof(*extref); |
| 1121 | } |
| 1122 | *search_done = 1; |
| 1123 | } |
| 1124 | btrfs_release_path(path); |
| 1125 | |
Jan Schmidt | 5a1d784 | 2012-08-17 14:04:41 -0700 | [diff] [blame] | 1126 | /* look for a conflicting sequence number */ |
| 1127 | di = btrfs_lookup_dir_index_item(trans, root, path, btrfs_ino(dir), |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 1128 | ref_index, name, namelen, 0); |
Jan Schmidt | 5a1d784 | 2012-08-17 14:04:41 -0700 | [diff] [blame] | 1129 | if (di && !IS_ERR(di)) { |
| 1130 | ret = drop_one_dir_item(trans, root, path, dir, di); |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 1131 | if (ret) |
| 1132 | return ret; |
Jan Schmidt | 5a1d784 | 2012-08-17 14:04:41 -0700 | [diff] [blame] | 1133 | } |
| 1134 | btrfs_release_path(path); |
| 1135 | |
| 1136 | /* look for a conflicing name */ |
| 1137 | di = btrfs_lookup_dir_item(trans, root, path, btrfs_ino(dir), |
| 1138 | name, namelen, 0); |
| 1139 | if (di && !IS_ERR(di)) { |
| 1140 | ret = drop_one_dir_item(trans, root, path, dir, di); |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 1141 | if (ret) |
| 1142 | return ret; |
Jan Schmidt | 5a1d784 | 2012-08-17 14:04:41 -0700 | [diff] [blame] | 1143 | } |
| 1144 | btrfs_release_path(path); |
| 1145 | |
| 1146 | return 0; |
| 1147 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1148 | |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 1149 | static int extref_get_fields(struct extent_buffer *eb, unsigned long ref_ptr, |
| 1150 | u32 *namelen, char **name, u64 *index, |
| 1151 | u64 *parent_objectid) |
| 1152 | { |
| 1153 | struct btrfs_inode_extref *extref; |
| 1154 | |
| 1155 | extref = (struct btrfs_inode_extref *)ref_ptr; |
| 1156 | |
| 1157 | *namelen = btrfs_inode_extref_name_len(eb, extref); |
| 1158 | *name = kmalloc(*namelen, GFP_NOFS); |
| 1159 | if (*name == NULL) |
| 1160 | return -ENOMEM; |
| 1161 | |
| 1162 | read_extent_buffer(eb, *name, (unsigned long)&extref->name, |
| 1163 | *namelen); |
| 1164 | |
| 1165 | *index = btrfs_inode_extref_index(eb, extref); |
| 1166 | if (parent_objectid) |
| 1167 | *parent_objectid = btrfs_inode_extref_parent(eb, extref); |
| 1168 | |
| 1169 | return 0; |
| 1170 | } |
| 1171 | |
| 1172 | static int ref_get_fields(struct extent_buffer *eb, unsigned long ref_ptr, |
| 1173 | u32 *namelen, char **name, u64 *index) |
| 1174 | { |
| 1175 | struct btrfs_inode_ref *ref; |
| 1176 | |
| 1177 | ref = (struct btrfs_inode_ref *)ref_ptr; |
| 1178 | |
| 1179 | *namelen = btrfs_inode_ref_name_len(eb, ref); |
| 1180 | *name = kmalloc(*namelen, GFP_NOFS); |
| 1181 | if (*name == NULL) |
| 1182 | return -ENOMEM; |
| 1183 | |
| 1184 | read_extent_buffer(eb, *name, (unsigned long)(ref + 1), *namelen); |
| 1185 | |
| 1186 | *index = btrfs_inode_ref_index(eb, ref); |
| 1187 | |
| 1188 | return 0; |
| 1189 | } |
| 1190 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1191 | /* |
| 1192 | * replay one inode back reference item found in the log tree. |
| 1193 | * eb, slot and key refer to the buffer and key found in the log tree. |
| 1194 | * root is the destination we are replaying into, and path is for temp |
| 1195 | * use by this function. (it should be released on return). |
| 1196 | */ |
| 1197 | static noinline int add_inode_ref(struct btrfs_trans_handle *trans, |
| 1198 | struct btrfs_root *root, |
| 1199 | struct btrfs_root *log, |
| 1200 | struct btrfs_path *path, |
| 1201 | struct extent_buffer *eb, int slot, |
| 1202 | struct btrfs_key *key) |
| 1203 | { |
Geyslan G. Bem | 03b2f08 | 2013-10-11 15:35:45 -0300 | [diff] [blame] | 1204 | struct inode *dir = NULL; |
| 1205 | struct inode *inode = NULL; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1206 | unsigned long ref_ptr; |
| 1207 | unsigned long ref_end; |
Geyslan G. Bem | 03b2f08 | 2013-10-11 15:35:45 -0300 | [diff] [blame] | 1208 | char *name = NULL; |
liubo | 34f3e4f | 2011-08-06 08:35:23 +0000 | [diff] [blame] | 1209 | int namelen; |
| 1210 | int ret; |
liubo | c622ae6 | 2011-03-26 08:01:12 -0400 | [diff] [blame] | 1211 | int search_done = 0; |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 1212 | int log_ref_ver = 0; |
| 1213 | u64 parent_objectid; |
| 1214 | u64 inode_objectid; |
Chris Mason | f46dbe3de | 2012-10-09 11:17:20 -0400 | [diff] [blame] | 1215 | u64 ref_index = 0; |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 1216 | int ref_struct_size; |
| 1217 | |
| 1218 | ref_ptr = btrfs_item_ptr_offset(eb, slot); |
| 1219 | ref_end = ref_ptr + btrfs_item_size_nr(eb, slot); |
| 1220 | |
| 1221 | if (key->type == BTRFS_INODE_EXTREF_KEY) { |
| 1222 | struct btrfs_inode_extref *r; |
| 1223 | |
| 1224 | ref_struct_size = sizeof(struct btrfs_inode_extref); |
| 1225 | log_ref_ver = 1; |
| 1226 | r = (struct btrfs_inode_extref *)ref_ptr; |
| 1227 | parent_objectid = btrfs_inode_extref_parent(eb, r); |
| 1228 | } else { |
| 1229 | ref_struct_size = sizeof(struct btrfs_inode_ref); |
| 1230 | parent_objectid = key->offset; |
| 1231 | } |
| 1232 | inode_objectid = key->objectid; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1233 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1234 | /* |
| 1235 | * it is possible that we didn't log all the parent directories |
| 1236 | * for a given inode. If we don't find the dir, just don't |
| 1237 | * copy the back ref in. The link count fixup code will take |
| 1238 | * care of the rest |
| 1239 | */ |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 1240 | dir = read_one_inode(root, parent_objectid); |
Geyslan G. Bem | 03b2f08 | 2013-10-11 15:35:45 -0300 | [diff] [blame] | 1241 | if (!dir) { |
| 1242 | ret = -ENOENT; |
| 1243 | goto out; |
| 1244 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1245 | |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 1246 | inode = read_one_inode(root, inode_objectid); |
Tsutomu Itoh | c00e949 | 2011-04-28 09:10:23 +0000 | [diff] [blame] | 1247 | if (!inode) { |
Geyslan G. Bem | 03b2f08 | 2013-10-11 15:35:45 -0300 | [diff] [blame] | 1248 | ret = -EIO; |
| 1249 | goto out; |
Tsutomu Itoh | c00e949 | 2011-04-28 09:10:23 +0000 | [diff] [blame] | 1250 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1251 | |
Jan Schmidt | 5a1d784 | 2012-08-17 14:04:41 -0700 | [diff] [blame] | 1252 | while (ref_ptr < ref_end) { |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 1253 | if (log_ref_ver) { |
| 1254 | ret = extref_get_fields(eb, ref_ptr, &namelen, &name, |
| 1255 | &ref_index, &parent_objectid); |
| 1256 | /* |
| 1257 | * parent object can change from one array |
| 1258 | * item to another. |
| 1259 | */ |
| 1260 | if (!dir) |
| 1261 | dir = read_one_inode(root, parent_objectid); |
Geyslan G. Bem | 03b2f08 | 2013-10-11 15:35:45 -0300 | [diff] [blame] | 1262 | if (!dir) { |
| 1263 | ret = -ENOENT; |
| 1264 | goto out; |
| 1265 | } |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 1266 | } else { |
| 1267 | ret = ref_get_fields(eb, ref_ptr, &namelen, &name, |
| 1268 | &ref_index); |
| 1269 | } |
| 1270 | if (ret) |
Geyslan G. Bem | 03b2f08 | 2013-10-11 15:35:45 -0300 | [diff] [blame] | 1271 | goto out; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1272 | |
Jan Schmidt | 5a1d784 | 2012-08-17 14:04:41 -0700 | [diff] [blame] | 1273 | /* if we already have a perfect match, we're done */ |
| 1274 | if (!inode_in_dir(root, path, btrfs_ino(dir), btrfs_ino(inode), |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 1275 | ref_index, name, namelen)) { |
Jan Schmidt | 5a1d784 | 2012-08-17 14:04:41 -0700 | [diff] [blame] | 1276 | /* |
| 1277 | * look for a conflicting back reference in the |
| 1278 | * metadata. if we find one we have to unlink that name |
| 1279 | * of the file before we add our new link. Later on, we |
| 1280 | * overwrite any existing back reference, and we don't |
| 1281 | * want to create dangling pointers in the directory. |
| 1282 | */ |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1283 | |
Jan Schmidt | 5a1d784 | 2012-08-17 14:04:41 -0700 | [diff] [blame] | 1284 | if (!search_done) { |
| 1285 | ret = __add_inode_ref(trans, root, path, log, |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 1286 | dir, inode, eb, |
| 1287 | inode_objectid, |
| 1288 | parent_objectid, |
| 1289 | ref_index, name, namelen, |
Jan Schmidt | 5a1d784 | 2012-08-17 14:04:41 -0700 | [diff] [blame] | 1290 | &search_done); |
Geyslan G. Bem | 03b2f08 | 2013-10-11 15:35:45 -0300 | [diff] [blame] | 1291 | if (ret) { |
| 1292 | if (ret == 1) |
| 1293 | ret = 0; |
Jan Schmidt | 5a1d784 | 2012-08-17 14:04:41 -0700 | [diff] [blame] | 1294 | goto out; |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 1295 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1296 | } |
Jan Schmidt | 5a1d784 | 2012-08-17 14:04:41 -0700 | [diff] [blame] | 1297 | |
| 1298 | /* insert our name */ |
| 1299 | ret = btrfs_add_link(trans, dir, inode, name, namelen, |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 1300 | 0, ref_index); |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 1301 | if (ret) |
| 1302 | goto out; |
Jan Schmidt | 5a1d784 | 2012-08-17 14:04:41 -0700 | [diff] [blame] | 1303 | |
| 1304 | btrfs_update_inode(trans, root, inode); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1305 | } |
liubo | c622ae6 | 2011-03-26 08:01:12 -0400 | [diff] [blame] | 1306 | |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 1307 | ref_ptr = (unsigned long)(ref_ptr + ref_struct_size) + namelen; |
Jan Schmidt | 5a1d784 | 2012-08-17 14:04:41 -0700 | [diff] [blame] | 1308 | kfree(name); |
Geyslan G. Bem | 03b2f08 | 2013-10-11 15:35:45 -0300 | [diff] [blame] | 1309 | name = NULL; |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 1310 | if (log_ref_ver) { |
| 1311 | iput(dir); |
| 1312 | dir = NULL; |
| 1313 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1314 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1315 | |
| 1316 | /* finally write the back reference in the inode */ |
| 1317 | ret = overwrite_item(trans, root, path, eb, slot, key); |
Jan Schmidt | 5a1d784 | 2012-08-17 14:04:41 -0700 | [diff] [blame] | 1318 | out: |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1319 | btrfs_release_path(path); |
Geyslan G. Bem | 03b2f08 | 2013-10-11 15:35:45 -0300 | [diff] [blame] | 1320 | kfree(name); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1321 | iput(dir); |
| 1322 | iput(inode); |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 1323 | return ret; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1324 | } |
| 1325 | |
Yan, Zheng | c71bf09 | 2009-11-12 09:34:40 +0000 | [diff] [blame] | 1326 | static int insert_orphan_item(struct btrfs_trans_handle *trans, |
David Sterba | 9c4f61f | 2015-01-02 19:12:57 +0100 | [diff] [blame] | 1327 | struct btrfs_root *root, u64 ino) |
Yan, Zheng | c71bf09 | 2009-11-12 09:34:40 +0000 | [diff] [blame] | 1328 | { |
| 1329 | int ret; |
David Sterba | 381cf65 | 2015-01-02 18:45:16 +0100 | [diff] [blame] | 1330 | |
David Sterba | 9c4f61f | 2015-01-02 19:12:57 +0100 | [diff] [blame] | 1331 | ret = btrfs_insert_orphan_item(trans, root, ino); |
| 1332 | if (ret == -EEXIST) |
| 1333 | ret = 0; |
David Sterba | 381cf65 | 2015-01-02 18:45:16 +0100 | [diff] [blame] | 1334 | |
Yan, Zheng | c71bf09 | 2009-11-12 09:34:40 +0000 | [diff] [blame] | 1335 | return ret; |
| 1336 | } |
| 1337 | |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 1338 | static int count_inode_extrefs(struct btrfs_root *root, |
| 1339 | struct inode *inode, struct btrfs_path *path) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1340 | { |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 1341 | int ret = 0; |
| 1342 | int name_len; |
| 1343 | unsigned int nlink = 0; |
| 1344 | u32 item_size; |
| 1345 | u32 cur_offset = 0; |
| 1346 | u64 inode_objectid = btrfs_ino(inode); |
| 1347 | u64 offset = 0; |
| 1348 | unsigned long ptr; |
| 1349 | struct btrfs_inode_extref *extref; |
| 1350 | struct extent_buffer *leaf; |
| 1351 | |
| 1352 | while (1) { |
| 1353 | ret = btrfs_find_one_extref(root, inode_objectid, offset, path, |
| 1354 | &extref, &offset); |
| 1355 | if (ret) |
| 1356 | break; |
| 1357 | |
| 1358 | leaf = path->nodes[0]; |
| 1359 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); |
| 1360 | ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); |
Filipe Manana | 2c2c452 | 2015-01-13 16:40:04 +0000 | [diff] [blame] | 1361 | cur_offset = 0; |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 1362 | |
| 1363 | while (cur_offset < item_size) { |
| 1364 | extref = (struct btrfs_inode_extref *) (ptr + cur_offset); |
| 1365 | name_len = btrfs_inode_extref_name_len(leaf, extref); |
| 1366 | |
| 1367 | nlink++; |
| 1368 | |
| 1369 | cur_offset += name_len + sizeof(*extref); |
| 1370 | } |
| 1371 | |
| 1372 | offset++; |
| 1373 | btrfs_release_path(path); |
| 1374 | } |
| 1375 | btrfs_release_path(path); |
| 1376 | |
Filipe Manana | 2c2c452 | 2015-01-13 16:40:04 +0000 | [diff] [blame] | 1377 | if (ret < 0 && ret != -ENOENT) |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 1378 | return ret; |
| 1379 | return nlink; |
| 1380 | } |
| 1381 | |
| 1382 | static int count_inode_refs(struct btrfs_root *root, |
| 1383 | struct inode *inode, struct btrfs_path *path) |
| 1384 | { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1385 | int ret; |
| 1386 | struct btrfs_key key; |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 1387 | unsigned int nlink = 0; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1388 | unsigned long ptr; |
| 1389 | unsigned long ptr_end; |
| 1390 | int name_len; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1391 | u64 ino = btrfs_ino(inode); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1392 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1393 | key.objectid = ino; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1394 | key.type = BTRFS_INODE_REF_KEY; |
| 1395 | key.offset = (u64)-1; |
| 1396 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1397 | while (1) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1398 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 1399 | if (ret < 0) |
| 1400 | break; |
| 1401 | if (ret > 0) { |
| 1402 | if (path->slots[0] == 0) |
| 1403 | break; |
| 1404 | path->slots[0]--; |
| 1405 | } |
Filipe David Borba Manana | e93ae26 | 2013-10-14 22:49:11 +0100 | [diff] [blame] | 1406 | process_slot: |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1407 | btrfs_item_key_to_cpu(path->nodes[0], &key, |
| 1408 | path->slots[0]); |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1409 | if (key.objectid != ino || |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1410 | key.type != BTRFS_INODE_REF_KEY) |
| 1411 | break; |
| 1412 | ptr = btrfs_item_ptr_offset(path->nodes[0], path->slots[0]); |
| 1413 | ptr_end = ptr + btrfs_item_size_nr(path->nodes[0], |
| 1414 | path->slots[0]); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1415 | while (ptr < ptr_end) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1416 | struct btrfs_inode_ref *ref; |
| 1417 | |
| 1418 | ref = (struct btrfs_inode_ref *)ptr; |
| 1419 | name_len = btrfs_inode_ref_name_len(path->nodes[0], |
| 1420 | ref); |
| 1421 | ptr = (unsigned long)(ref + 1) + name_len; |
| 1422 | nlink++; |
| 1423 | } |
| 1424 | |
| 1425 | if (key.offset == 0) |
| 1426 | break; |
Filipe David Borba Manana | e93ae26 | 2013-10-14 22:49:11 +0100 | [diff] [blame] | 1427 | if (path->slots[0] > 0) { |
| 1428 | path->slots[0]--; |
| 1429 | goto process_slot; |
| 1430 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1431 | key.offset--; |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1432 | btrfs_release_path(path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1433 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1434 | btrfs_release_path(path); |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 1435 | |
| 1436 | return nlink; |
| 1437 | } |
| 1438 | |
| 1439 | /* |
| 1440 | * There are a few corners where the link count of the file can't |
| 1441 | * be properly maintained during replay. So, instead of adding |
| 1442 | * lots of complexity to the log code, we just scan the backrefs |
| 1443 | * for any file that has been through replay. |
| 1444 | * |
| 1445 | * The scan will update the link count on the inode to reflect the |
| 1446 | * number of back refs found. If it goes down to zero, the iput |
| 1447 | * will free the inode. |
| 1448 | */ |
| 1449 | static noinline int fixup_inode_link_count(struct btrfs_trans_handle *trans, |
| 1450 | struct btrfs_root *root, |
| 1451 | struct inode *inode) |
| 1452 | { |
| 1453 | struct btrfs_path *path; |
| 1454 | int ret; |
| 1455 | u64 nlink = 0; |
| 1456 | u64 ino = btrfs_ino(inode); |
| 1457 | |
| 1458 | path = btrfs_alloc_path(); |
| 1459 | if (!path) |
| 1460 | return -ENOMEM; |
| 1461 | |
| 1462 | ret = count_inode_refs(root, inode, path); |
| 1463 | if (ret < 0) |
| 1464 | goto out; |
| 1465 | |
| 1466 | nlink = ret; |
| 1467 | |
| 1468 | ret = count_inode_extrefs(root, inode, path); |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 1469 | if (ret < 0) |
| 1470 | goto out; |
| 1471 | |
| 1472 | nlink += ret; |
| 1473 | |
| 1474 | ret = 0; |
| 1475 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1476 | if (nlink != inode->i_nlink) { |
Miklos Szeredi | bfe8684 | 2011-10-28 14:13:29 +0200 | [diff] [blame] | 1477 | set_nlink(inode, nlink); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1478 | btrfs_update_inode(trans, root, inode); |
| 1479 | } |
Chris Mason | 8d5bf1c | 2008-09-11 15:51:21 -0400 | [diff] [blame] | 1480 | BTRFS_I(inode)->index_cnt = (u64)-1; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1481 | |
Yan, Zheng | c71bf09 | 2009-11-12 09:34:40 +0000 | [diff] [blame] | 1482 | if (inode->i_nlink == 0) { |
| 1483 | if (S_ISDIR(inode->i_mode)) { |
| 1484 | ret = replay_dir_deletes(trans, root, NULL, path, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1485 | ino, 1); |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 1486 | if (ret) |
| 1487 | goto out; |
Yan, Zheng | c71bf09 | 2009-11-12 09:34:40 +0000 | [diff] [blame] | 1488 | } |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1489 | ret = insert_orphan_item(trans, root, ino); |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 1490 | } |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 1491 | |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 1492 | out: |
| 1493 | btrfs_free_path(path); |
| 1494 | return ret; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1495 | } |
| 1496 | |
| 1497 | static noinline int fixup_inode_link_counts(struct btrfs_trans_handle *trans, |
| 1498 | struct btrfs_root *root, |
| 1499 | struct btrfs_path *path) |
| 1500 | { |
| 1501 | int ret; |
| 1502 | struct btrfs_key key; |
| 1503 | struct inode *inode; |
| 1504 | |
| 1505 | key.objectid = BTRFS_TREE_LOG_FIXUP_OBJECTID; |
| 1506 | key.type = BTRFS_ORPHAN_ITEM_KEY; |
| 1507 | key.offset = (u64)-1; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1508 | while (1) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1509 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
| 1510 | if (ret < 0) |
| 1511 | break; |
| 1512 | |
| 1513 | if (ret == 1) { |
| 1514 | if (path->slots[0] == 0) |
| 1515 | break; |
| 1516 | path->slots[0]--; |
| 1517 | } |
| 1518 | |
| 1519 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); |
| 1520 | if (key.objectid != BTRFS_TREE_LOG_FIXUP_OBJECTID || |
| 1521 | key.type != BTRFS_ORPHAN_ITEM_KEY) |
| 1522 | break; |
| 1523 | |
| 1524 | ret = btrfs_del_item(trans, root, path); |
Tsutomu Itoh | 65a246c | 2011-05-19 04:37:44 +0000 | [diff] [blame] | 1525 | if (ret) |
| 1526 | goto out; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1527 | |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1528 | btrfs_release_path(path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1529 | inode = read_one_inode(root, key.offset); |
Tsutomu Itoh | c00e949 | 2011-04-28 09:10:23 +0000 | [diff] [blame] | 1530 | if (!inode) |
| 1531 | return -EIO; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1532 | |
| 1533 | ret = fixup_inode_link_count(trans, root, inode); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1534 | iput(inode); |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 1535 | if (ret) |
| 1536 | goto out; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1537 | |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 1538 | /* |
| 1539 | * fixup on a directory may create new entries, |
| 1540 | * make sure we always look for the highset possible |
| 1541 | * offset |
| 1542 | */ |
| 1543 | key.offset = (u64)-1; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1544 | } |
Tsutomu Itoh | 65a246c | 2011-05-19 04:37:44 +0000 | [diff] [blame] | 1545 | ret = 0; |
| 1546 | out: |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1547 | btrfs_release_path(path); |
Tsutomu Itoh | 65a246c | 2011-05-19 04:37:44 +0000 | [diff] [blame] | 1548 | return ret; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1549 | } |
| 1550 | |
| 1551 | |
| 1552 | /* |
| 1553 | * record a given inode in the fixup dir so we can check its link |
| 1554 | * count when replay is done. The link count is incremented here |
| 1555 | * so the inode won't go away until we check it |
| 1556 | */ |
| 1557 | static noinline int link_to_fixup_dir(struct btrfs_trans_handle *trans, |
| 1558 | struct btrfs_root *root, |
| 1559 | struct btrfs_path *path, |
| 1560 | u64 objectid) |
| 1561 | { |
| 1562 | struct btrfs_key key; |
| 1563 | int ret = 0; |
| 1564 | struct inode *inode; |
| 1565 | |
| 1566 | inode = read_one_inode(root, objectid); |
Tsutomu Itoh | c00e949 | 2011-04-28 09:10:23 +0000 | [diff] [blame] | 1567 | if (!inode) |
| 1568 | return -EIO; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1569 | |
| 1570 | key.objectid = BTRFS_TREE_LOG_FIXUP_OBJECTID; |
David Sterba | 962a298 | 2014-06-04 18:41:45 +0200 | [diff] [blame] | 1571 | key.type = BTRFS_ORPHAN_ITEM_KEY; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1572 | key.offset = objectid; |
| 1573 | |
| 1574 | ret = btrfs_insert_empty_item(trans, root, path, &key, 0); |
| 1575 | |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1576 | btrfs_release_path(path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1577 | if (ret == 0) { |
Josef Bacik | 9bf7a48 | 2013-03-01 13:35:47 -0500 | [diff] [blame] | 1578 | if (!inode->i_nlink) |
| 1579 | set_nlink(inode, 1); |
| 1580 | else |
Zach Brown | 8b558c5 | 2013-10-16 12:10:34 -0700 | [diff] [blame] | 1581 | inc_nlink(inode); |
Tsutomu Itoh | b995929 | 2012-06-25 21:25:22 -0600 | [diff] [blame] | 1582 | ret = btrfs_update_inode(trans, root, inode); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1583 | } else if (ret == -EEXIST) { |
| 1584 | ret = 0; |
| 1585 | } else { |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 1586 | BUG(); /* Logic Error */ |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1587 | } |
| 1588 | iput(inode); |
| 1589 | |
| 1590 | return ret; |
| 1591 | } |
| 1592 | |
| 1593 | /* |
| 1594 | * when replaying the log for a directory, we only insert names |
| 1595 | * for inodes that actually exist. This means an fsync on a directory |
| 1596 | * does not implicitly fsync all the new files in it |
| 1597 | */ |
| 1598 | static noinline int insert_one_name(struct btrfs_trans_handle *trans, |
| 1599 | struct btrfs_root *root, |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1600 | u64 dirid, u64 index, |
Zhaolei | 60d53eb | 2015-08-17 18:44:46 +0800 | [diff] [blame] | 1601 | char *name, int name_len, |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1602 | struct btrfs_key *location) |
| 1603 | { |
| 1604 | struct inode *inode; |
| 1605 | struct inode *dir; |
| 1606 | int ret; |
| 1607 | |
| 1608 | inode = read_one_inode(root, location->objectid); |
| 1609 | if (!inode) |
| 1610 | return -ENOENT; |
| 1611 | |
| 1612 | dir = read_one_inode(root, dirid); |
| 1613 | if (!dir) { |
| 1614 | iput(inode); |
| 1615 | return -EIO; |
| 1616 | } |
Josef Bacik | d555438 | 2013-09-11 14:17:00 -0400 | [diff] [blame] | 1617 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1618 | ret = btrfs_add_link(trans, dir, inode, name, name_len, 1, index); |
| 1619 | |
| 1620 | /* FIXME, put inode into FIXUP list */ |
| 1621 | |
| 1622 | iput(inode); |
| 1623 | iput(dir); |
| 1624 | return ret; |
| 1625 | } |
| 1626 | |
| 1627 | /* |
Filipe Manana | df8d116 | 2015-01-14 01:52:25 +0000 | [diff] [blame] | 1628 | * Return true if an inode reference exists in the log for the given name, |
| 1629 | * inode and parent inode. |
| 1630 | */ |
| 1631 | static bool name_in_log_ref(struct btrfs_root *log_root, |
| 1632 | const char *name, const int name_len, |
| 1633 | const u64 dirid, const u64 ino) |
| 1634 | { |
| 1635 | struct btrfs_key search_key; |
| 1636 | |
| 1637 | search_key.objectid = ino; |
| 1638 | search_key.type = BTRFS_INODE_REF_KEY; |
| 1639 | search_key.offset = dirid; |
| 1640 | if (backref_in_log(log_root, &search_key, dirid, name, name_len)) |
| 1641 | return true; |
| 1642 | |
| 1643 | search_key.type = BTRFS_INODE_EXTREF_KEY; |
| 1644 | search_key.offset = btrfs_extref_hash(dirid, name, name_len); |
| 1645 | if (backref_in_log(log_root, &search_key, dirid, name, name_len)) |
| 1646 | return true; |
| 1647 | |
| 1648 | return false; |
| 1649 | } |
| 1650 | |
| 1651 | /* |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1652 | * take a single entry in a log directory item and replay it into |
| 1653 | * the subvolume. |
| 1654 | * |
| 1655 | * if a conflicting item exists in the subdirectory already, |
| 1656 | * the inode it points to is unlinked and put into the link count |
| 1657 | * fix up tree. |
| 1658 | * |
| 1659 | * If a name from the log points to a file or directory that does |
| 1660 | * not exist in the FS, it is skipped. fsyncs on directories |
| 1661 | * do not force down inodes inside that directory, just changes to the |
| 1662 | * names or unlinks in a directory. |
Filipe Manana | bb53eda | 2015-07-15 23:26:43 +0100 | [diff] [blame] | 1663 | * |
| 1664 | * Returns < 0 on error, 0 if the name wasn't replayed (dentry points to a |
| 1665 | * non-existing inode) and 1 if the name was replayed. |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1666 | */ |
| 1667 | static noinline int replay_one_name(struct btrfs_trans_handle *trans, |
| 1668 | struct btrfs_root *root, |
| 1669 | struct btrfs_path *path, |
| 1670 | struct extent_buffer *eb, |
| 1671 | struct btrfs_dir_item *di, |
| 1672 | struct btrfs_key *key) |
| 1673 | { |
| 1674 | char *name; |
| 1675 | int name_len; |
| 1676 | struct btrfs_dir_item *dst_di; |
| 1677 | struct btrfs_key found_key; |
| 1678 | struct btrfs_key log_key; |
| 1679 | struct inode *dir; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1680 | u8 log_type; |
Chris Mason | 4bef084 | 2008-09-08 11:18:08 -0400 | [diff] [blame] | 1681 | int exists; |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 1682 | int ret = 0; |
Josef Bacik | d555438 | 2013-09-11 14:17:00 -0400 | [diff] [blame] | 1683 | bool update_size = (key->type == BTRFS_DIR_INDEX_KEY); |
Filipe Manana | bb53eda | 2015-07-15 23:26:43 +0100 | [diff] [blame] | 1684 | bool name_added = false; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1685 | |
| 1686 | dir = read_one_inode(root, key->objectid); |
Tsutomu Itoh | c00e949 | 2011-04-28 09:10:23 +0000 | [diff] [blame] | 1687 | if (!dir) |
| 1688 | return -EIO; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1689 | |
| 1690 | name_len = btrfs_dir_name_len(eb, di); |
| 1691 | name = kmalloc(name_len, GFP_NOFS); |
Filipe David Borba Manana | 2bac325 | 2013-08-04 19:58:57 +0100 | [diff] [blame] | 1692 | if (!name) { |
| 1693 | ret = -ENOMEM; |
| 1694 | goto out; |
| 1695 | } |
liubo | 2a29edc | 2011-01-26 06:22:08 +0000 | [diff] [blame] | 1696 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1697 | log_type = btrfs_dir_type(eb, di); |
| 1698 | read_extent_buffer(eb, name, (unsigned long)(di + 1), |
| 1699 | name_len); |
| 1700 | |
| 1701 | btrfs_dir_item_key_to_cpu(eb, di, &log_key); |
Chris Mason | 4bef084 | 2008-09-08 11:18:08 -0400 | [diff] [blame] | 1702 | exists = btrfs_lookup_inode(trans, root, path, &log_key, 0); |
| 1703 | if (exists == 0) |
| 1704 | exists = 1; |
| 1705 | else |
| 1706 | exists = 0; |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1707 | btrfs_release_path(path); |
Chris Mason | 4bef084 | 2008-09-08 11:18:08 -0400 | [diff] [blame] | 1708 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1709 | if (key->type == BTRFS_DIR_ITEM_KEY) { |
| 1710 | dst_di = btrfs_lookup_dir_item(trans, root, path, key->objectid, |
| 1711 | name, name_len, 1); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1712 | } else if (key->type == BTRFS_DIR_INDEX_KEY) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1713 | dst_di = btrfs_lookup_dir_index_item(trans, root, path, |
| 1714 | key->objectid, |
| 1715 | key->offset, name, |
| 1716 | name_len, 1); |
| 1717 | } else { |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 1718 | /* Corruption */ |
| 1719 | ret = -EINVAL; |
| 1720 | goto out; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1721 | } |
David Sterba | c704005 | 2011-04-19 18:00:01 +0200 | [diff] [blame] | 1722 | if (IS_ERR_OR_NULL(dst_di)) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1723 | /* we need a sequence number to insert, so we only |
| 1724 | * do inserts for the BTRFS_DIR_INDEX_KEY types |
| 1725 | */ |
| 1726 | if (key->type != BTRFS_DIR_INDEX_KEY) |
| 1727 | goto out; |
| 1728 | goto insert; |
| 1729 | } |
| 1730 | |
| 1731 | btrfs_dir_item_key_to_cpu(path->nodes[0], dst_di, &found_key); |
| 1732 | /* the existing item matches the logged item */ |
| 1733 | if (found_key.objectid == log_key.objectid && |
| 1734 | found_key.type == log_key.type && |
| 1735 | found_key.offset == log_key.offset && |
| 1736 | btrfs_dir_type(path->nodes[0], dst_di) == log_type) { |
Filipe Manana | a2cc11d | 2014-09-08 22:53:18 +0100 | [diff] [blame] | 1737 | update_size = false; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1738 | goto out; |
| 1739 | } |
| 1740 | |
| 1741 | /* |
| 1742 | * don't drop the conflicting directory entry if the inode |
| 1743 | * for the new entry doesn't exist |
| 1744 | */ |
Chris Mason | 4bef084 | 2008-09-08 11:18:08 -0400 | [diff] [blame] | 1745 | if (!exists) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1746 | goto out; |
| 1747 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1748 | ret = drop_one_dir_item(trans, root, path, dir, dst_di); |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 1749 | if (ret) |
| 1750 | goto out; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1751 | |
| 1752 | if (key->type == BTRFS_DIR_INDEX_KEY) |
| 1753 | goto insert; |
| 1754 | out: |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1755 | btrfs_release_path(path); |
Josef Bacik | d555438 | 2013-09-11 14:17:00 -0400 | [diff] [blame] | 1756 | if (!ret && update_size) { |
| 1757 | btrfs_i_size_write(dir, dir->i_size + name_len * 2); |
| 1758 | ret = btrfs_update_inode(trans, root, dir); |
| 1759 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1760 | kfree(name); |
| 1761 | iput(dir); |
Filipe Manana | bb53eda | 2015-07-15 23:26:43 +0100 | [diff] [blame] | 1762 | if (!ret && name_added) |
| 1763 | ret = 1; |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 1764 | return ret; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1765 | |
| 1766 | insert: |
Filipe Manana | df8d116 | 2015-01-14 01:52:25 +0000 | [diff] [blame] | 1767 | if (name_in_log_ref(root->log_root, name, name_len, |
| 1768 | key->objectid, log_key.objectid)) { |
| 1769 | /* The dentry will be added later. */ |
| 1770 | ret = 0; |
| 1771 | update_size = false; |
| 1772 | goto out; |
| 1773 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1774 | btrfs_release_path(path); |
Zhaolei | 60d53eb | 2015-08-17 18:44:46 +0800 | [diff] [blame] | 1775 | ret = insert_one_name(trans, root, key->objectid, key->offset, |
| 1776 | name, name_len, &log_key); |
Filipe Manana | df8d116 | 2015-01-14 01:52:25 +0000 | [diff] [blame] | 1777 | if (ret && ret != -ENOENT && ret != -EEXIST) |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 1778 | goto out; |
Filipe Manana | bb53eda | 2015-07-15 23:26:43 +0100 | [diff] [blame] | 1779 | if (!ret) |
| 1780 | name_added = true; |
Josef Bacik | d555438 | 2013-09-11 14:17:00 -0400 | [diff] [blame] | 1781 | update_size = false; |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 1782 | ret = 0; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1783 | goto out; |
| 1784 | } |
| 1785 | |
| 1786 | /* |
| 1787 | * find all the names in a directory item and reconcile them into |
| 1788 | * the subvolume. Only BTRFS_DIR_ITEM_KEY types will have more than |
| 1789 | * one name in a directory item, but the same code gets used for |
| 1790 | * both directory index types |
| 1791 | */ |
| 1792 | static noinline int replay_one_dir_item(struct btrfs_trans_handle *trans, |
| 1793 | struct btrfs_root *root, |
| 1794 | struct btrfs_path *path, |
| 1795 | struct extent_buffer *eb, int slot, |
| 1796 | struct btrfs_key *key) |
| 1797 | { |
Filipe Manana | bb53eda | 2015-07-15 23:26:43 +0100 | [diff] [blame] | 1798 | int ret = 0; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1799 | u32 item_size = btrfs_item_size_nr(eb, slot); |
| 1800 | struct btrfs_dir_item *di; |
| 1801 | int name_len; |
| 1802 | unsigned long ptr; |
| 1803 | unsigned long ptr_end; |
Filipe Manana | bb53eda | 2015-07-15 23:26:43 +0100 | [diff] [blame] | 1804 | struct btrfs_path *fixup_path = NULL; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1805 | |
| 1806 | ptr = btrfs_item_ptr_offset(eb, slot); |
| 1807 | ptr_end = ptr + item_size; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1808 | while (ptr < ptr_end) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1809 | di = (struct btrfs_dir_item *)ptr; |
Josef Bacik | 22a94d4 | 2011-03-16 16:47:17 -0400 | [diff] [blame] | 1810 | if (verify_dir_item(root, eb, di)) |
| 1811 | return -EIO; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1812 | name_len = btrfs_dir_name_len(eb, di); |
| 1813 | ret = replay_one_name(trans, root, path, eb, di, key); |
Filipe Manana | bb53eda | 2015-07-15 23:26:43 +0100 | [diff] [blame] | 1814 | if (ret < 0) |
| 1815 | break; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1816 | ptr = (unsigned long)(di + 1); |
| 1817 | ptr += name_len; |
Filipe Manana | bb53eda | 2015-07-15 23:26:43 +0100 | [diff] [blame] | 1818 | |
| 1819 | /* |
| 1820 | * If this entry refers to a non-directory (directories can not |
| 1821 | * have a link count > 1) and it was added in the transaction |
| 1822 | * that was not committed, make sure we fixup the link count of |
| 1823 | * the inode it the entry points to. Otherwise something like |
| 1824 | * the following would result in a directory pointing to an |
| 1825 | * inode with a wrong link that does not account for this dir |
| 1826 | * entry: |
| 1827 | * |
| 1828 | * mkdir testdir |
| 1829 | * touch testdir/foo |
| 1830 | * touch testdir/bar |
| 1831 | * sync |
| 1832 | * |
| 1833 | * ln testdir/bar testdir/bar_link |
| 1834 | * ln testdir/foo testdir/foo_link |
| 1835 | * xfs_io -c "fsync" testdir/bar |
| 1836 | * |
| 1837 | * <power failure> |
| 1838 | * |
| 1839 | * mount fs, log replay happens |
| 1840 | * |
| 1841 | * File foo would remain with a link count of 1 when it has two |
| 1842 | * entries pointing to it in the directory testdir. This would |
| 1843 | * make it impossible to ever delete the parent directory has |
| 1844 | * it would result in stale dentries that can never be deleted. |
| 1845 | */ |
| 1846 | if (ret == 1 && btrfs_dir_type(eb, di) != BTRFS_FT_DIR) { |
| 1847 | struct btrfs_key di_key; |
| 1848 | |
| 1849 | if (!fixup_path) { |
| 1850 | fixup_path = btrfs_alloc_path(); |
| 1851 | if (!fixup_path) { |
| 1852 | ret = -ENOMEM; |
| 1853 | break; |
| 1854 | } |
| 1855 | } |
| 1856 | |
| 1857 | btrfs_dir_item_key_to_cpu(eb, di, &di_key); |
| 1858 | ret = link_to_fixup_dir(trans, root, fixup_path, |
| 1859 | di_key.objectid); |
| 1860 | if (ret) |
| 1861 | break; |
| 1862 | } |
| 1863 | ret = 0; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1864 | } |
Filipe Manana | bb53eda | 2015-07-15 23:26:43 +0100 | [diff] [blame] | 1865 | btrfs_free_path(fixup_path); |
| 1866 | return ret; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1867 | } |
| 1868 | |
| 1869 | /* |
| 1870 | * directory replay has two parts. There are the standard directory |
| 1871 | * items in the log copied from the subvolume, and range items |
| 1872 | * created in the log while the subvolume was logged. |
| 1873 | * |
| 1874 | * The range items tell us which parts of the key space the log |
| 1875 | * is authoritative for. During replay, if a key in the subvolume |
| 1876 | * directory is in a logged range item, but not actually in the log |
| 1877 | * that means it was deleted from the directory before the fsync |
| 1878 | * and should be removed. |
| 1879 | */ |
| 1880 | static noinline int find_dir_range(struct btrfs_root *root, |
| 1881 | struct btrfs_path *path, |
| 1882 | u64 dirid, int key_type, |
| 1883 | u64 *start_ret, u64 *end_ret) |
| 1884 | { |
| 1885 | struct btrfs_key key; |
| 1886 | u64 found_end; |
| 1887 | struct btrfs_dir_log_item *item; |
| 1888 | int ret; |
| 1889 | int nritems; |
| 1890 | |
| 1891 | if (*start_ret == (u64)-1) |
| 1892 | return 1; |
| 1893 | |
| 1894 | key.objectid = dirid; |
| 1895 | key.type = key_type; |
| 1896 | key.offset = *start_ret; |
| 1897 | |
| 1898 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 1899 | if (ret < 0) |
| 1900 | goto out; |
| 1901 | if (ret > 0) { |
| 1902 | if (path->slots[0] == 0) |
| 1903 | goto out; |
| 1904 | path->slots[0]--; |
| 1905 | } |
| 1906 | if (ret != 0) |
| 1907 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); |
| 1908 | |
| 1909 | if (key.type != key_type || key.objectid != dirid) { |
| 1910 | ret = 1; |
| 1911 | goto next; |
| 1912 | } |
| 1913 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
| 1914 | struct btrfs_dir_log_item); |
| 1915 | found_end = btrfs_dir_log_end(path->nodes[0], item); |
| 1916 | |
| 1917 | if (*start_ret >= key.offset && *start_ret <= found_end) { |
| 1918 | ret = 0; |
| 1919 | *start_ret = key.offset; |
| 1920 | *end_ret = found_end; |
| 1921 | goto out; |
| 1922 | } |
| 1923 | ret = 1; |
| 1924 | next: |
| 1925 | /* check the next slot in the tree to see if it is a valid item */ |
| 1926 | nritems = btrfs_header_nritems(path->nodes[0]); |
| 1927 | if (path->slots[0] >= nritems) { |
| 1928 | ret = btrfs_next_leaf(root, path); |
| 1929 | if (ret) |
| 1930 | goto out; |
| 1931 | } else { |
| 1932 | path->slots[0]++; |
| 1933 | } |
| 1934 | |
| 1935 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); |
| 1936 | |
| 1937 | if (key.type != key_type || key.objectid != dirid) { |
| 1938 | ret = 1; |
| 1939 | goto out; |
| 1940 | } |
| 1941 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
| 1942 | struct btrfs_dir_log_item); |
| 1943 | found_end = btrfs_dir_log_end(path->nodes[0], item); |
| 1944 | *start_ret = key.offset; |
| 1945 | *end_ret = found_end; |
| 1946 | ret = 0; |
| 1947 | out: |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1948 | btrfs_release_path(path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1949 | return ret; |
| 1950 | } |
| 1951 | |
| 1952 | /* |
| 1953 | * this looks for a given directory item in the log. If the directory |
| 1954 | * item is not in the log, the item is removed and the inode it points |
| 1955 | * to is unlinked |
| 1956 | */ |
| 1957 | static noinline int check_item_in_log(struct btrfs_trans_handle *trans, |
| 1958 | struct btrfs_root *root, |
| 1959 | struct btrfs_root *log, |
| 1960 | struct btrfs_path *path, |
| 1961 | struct btrfs_path *log_path, |
| 1962 | struct inode *dir, |
| 1963 | struct btrfs_key *dir_key) |
| 1964 | { |
| 1965 | int ret; |
| 1966 | struct extent_buffer *eb; |
| 1967 | int slot; |
| 1968 | u32 item_size; |
| 1969 | struct btrfs_dir_item *di; |
| 1970 | struct btrfs_dir_item *log_di; |
| 1971 | int name_len; |
| 1972 | unsigned long ptr; |
| 1973 | unsigned long ptr_end; |
| 1974 | char *name; |
| 1975 | struct inode *inode; |
| 1976 | struct btrfs_key location; |
| 1977 | |
| 1978 | again: |
| 1979 | eb = path->nodes[0]; |
| 1980 | slot = path->slots[0]; |
| 1981 | item_size = btrfs_item_size_nr(eb, slot); |
| 1982 | ptr = btrfs_item_ptr_offset(eb, slot); |
| 1983 | ptr_end = ptr + item_size; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1984 | while (ptr < ptr_end) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1985 | di = (struct btrfs_dir_item *)ptr; |
Josef Bacik | 22a94d4 | 2011-03-16 16:47:17 -0400 | [diff] [blame] | 1986 | if (verify_dir_item(root, eb, di)) { |
| 1987 | ret = -EIO; |
| 1988 | goto out; |
| 1989 | } |
| 1990 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1991 | name_len = btrfs_dir_name_len(eb, di); |
| 1992 | name = kmalloc(name_len, GFP_NOFS); |
| 1993 | if (!name) { |
| 1994 | ret = -ENOMEM; |
| 1995 | goto out; |
| 1996 | } |
| 1997 | read_extent_buffer(eb, name, (unsigned long)(di + 1), |
| 1998 | name_len); |
| 1999 | log_di = NULL; |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 2000 | if (log && dir_key->type == BTRFS_DIR_ITEM_KEY) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2001 | log_di = btrfs_lookup_dir_item(trans, log, log_path, |
| 2002 | dir_key->objectid, |
| 2003 | name, name_len, 0); |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 2004 | } else if (log && dir_key->type == BTRFS_DIR_INDEX_KEY) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2005 | log_di = btrfs_lookup_dir_index_item(trans, log, |
| 2006 | log_path, |
| 2007 | dir_key->objectid, |
| 2008 | dir_key->offset, |
| 2009 | name, name_len, 0); |
| 2010 | } |
Filipe David Borba Manana | 269d040 | 2013-10-28 17:39:21 +0000 | [diff] [blame] | 2011 | if (!log_di || (IS_ERR(log_di) && PTR_ERR(log_di) == -ENOENT)) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2012 | btrfs_dir_item_key_to_cpu(eb, di, &location); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 2013 | btrfs_release_path(path); |
| 2014 | btrfs_release_path(log_path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2015 | inode = read_one_inode(root, location.objectid); |
Tsutomu Itoh | c00e949 | 2011-04-28 09:10:23 +0000 | [diff] [blame] | 2016 | if (!inode) { |
| 2017 | kfree(name); |
| 2018 | return -EIO; |
| 2019 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2020 | |
| 2021 | ret = link_to_fixup_dir(trans, root, |
| 2022 | path, location.objectid); |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 2023 | if (ret) { |
| 2024 | kfree(name); |
| 2025 | iput(inode); |
| 2026 | goto out; |
| 2027 | } |
| 2028 | |
Zach Brown | 8b558c5 | 2013-10-16 12:10:34 -0700 | [diff] [blame] | 2029 | inc_nlink(inode); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2030 | ret = btrfs_unlink_inode(trans, root, dir, inode, |
| 2031 | name, name_len); |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 2032 | if (!ret) |
Filipe David Borba Manana | ada9af2 | 2013-08-05 09:25:47 +0100 | [diff] [blame] | 2033 | ret = btrfs_run_delayed_items(trans, root); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2034 | kfree(name); |
| 2035 | iput(inode); |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 2036 | if (ret) |
| 2037 | goto out; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2038 | |
| 2039 | /* there might still be more names under this key |
| 2040 | * check and repeat if required |
| 2041 | */ |
| 2042 | ret = btrfs_search_slot(NULL, root, dir_key, path, |
| 2043 | 0, 0); |
| 2044 | if (ret == 0) |
| 2045 | goto again; |
| 2046 | ret = 0; |
| 2047 | goto out; |
Filipe David Borba Manana | 269d040 | 2013-10-28 17:39:21 +0000 | [diff] [blame] | 2048 | } else if (IS_ERR(log_di)) { |
| 2049 | kfree(name); |
| 2050 | return PTR_ERR(log_di); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2051 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 2052 | btrfs_release_path(log_path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2053 | kfree(name); |
| 2054 | |
| 2055 | ptr = (unsigned long)(di + 1); |
| 2056 | ptr += name_len; |
| 2057 | } |
| 2058 | ret = 0; |
| 2059 | out: |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 2060 | btrfs_release_path(path); |
| 2061 | btrfs_release_path(log_path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2062 | return ret; |
| 2063 | } |
| 2064 | |
Filipe Manana | 4f764e5 | 2015-02-23 19:53:35 +0000 | [diff] [blame] | 2065 | static int replay_xattr_deletes(struct btrfs_trans_handle *trans, |
| 2066 | struct btrfs_root *root, |
| 2067 | struct btrfs_root *log, |
| 2068 | struct btrfs_path *path, |
| 2069 | const u64 ino) |
| 2070 | { |
| 2071 | struct btrfs_key search_key; |
| 2072 | struct btrfs_path *log_path; |
| 2073 | int i; |
| 2074 | int nritems; |
| 2075 | int ret; |
| 2076 | |
| 2077 | log_path = btrfs_alloc_path(); |
| 2078 | if (!log_path) |
| 2079 | return -ENOMEM; |
| 2080 | |
| 2081 | search_key.objectid = ino; |
| 2082 | search_key.type = BTRFS_XATTR_ITEM_KEY; |
| 2083 | search_key.offset = 0; |
| 2084 | again: |
| 2085 | ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0); |
| 2086 | if (ret < 0) |
| 2087 | goto out; |
| 2088 | process_leaf: |
| 2089 | nritems = btrfs_header_nritems(path->nodes[0]); |
| 2090 | for (i = path->slots[0]; i < nritems; i++) { |
| 2091 | struct btrfs_key key; |
| 2092 | struct btrfs_dir_item *di; |
| 2093 | struct btrfs_dir_item *log_di; |
| 2094 | u32 total_size; |
| 2095 | u32 cur; |
| 2096 | |
| 2097 | btrfs_item_key_to_cpu(path->nodes[0], &key, i); |
| 2098 | if (key.objectid != ino || key.type != BTRFS_XATTR_ITEM_KEY) { |
| 2099 | ret = 0; |
| 2100 | goto out; |
| 2101 | } |
| 2102 | |
| 2103 | di = btrfs_item_ptr(path->nodes[0], i, struct btrfs_dir_item); |
| 2104 | total_size = btrfs_item_size_nr(path->nodes[0], i); |
| 2105 | cur = 0; |
| 2106 | while (cur < total_size) { |
| 2107 | u16 name_len = btrfs_dir_name_len(path->nodes[0], di); |
| 2108 | u16 data_len = btrfs_dir_data_len(path->nodes[0], di); |
| 2109 | u32 this_len = sizeof(*di) + name_len + data_len; |
| 2110 | char *name; |
| 2111 | |
| 2112 | name = kmalloc(name_len, GFP_NOFS); |
| 2113 | if (!name) { |
| 2114 | ret = -ENOMEM; |
| 2115 | goto out; |
| 2116 | } |
| 2117 | read_extent_buffer(path->nodes[0], name, |
| 2118 | (unsigned long)(di + 1), name_len); |
| 2119 | |
| 2120 | log_di = btrfs_lookup_xattr(NULL, log, log_path, ino, |
| 2121 | name, name_len, 0); |
| 2122 | btrfs_release_path(log_path); |
| 2123 | if (!log_di) { |
| 2124 | /* Doesn't exist in log tree, so delete it. */ |
| 2125 | btrfs_release_path(path); |
| 2126 | di = btrfs_lookup_xattr(trans, root, path, ino, |
| 2127 | name, name_len, -1); |
| 2128 | kfree(name); |
| 2129 | if (IS_ERR(di)) { |
| 2130 | ret = PTR_ERR(di); |
| 2131 | goto out; |
| 2132 | } |
| 2133 | ASSERT(di); |
| 2134 | ret = btrfs_delete_one_dir_name(trans, root, |
| 2135 | path, di); |
| 2136 | if (ret) |
| 2137 | goto out; |
| 2138 | btrfs_release_path(path); |
| 2139 | search_key = key; |
| 2140 | goto again; |
| 2141 | } |
| 2142 | kfree(name); |
| 2143 | if (IS_ERR(log_di)) { |
| 2144 | ret = PTR_ERR(log_di); |
| 2145 | goto out; |
| 2146 | } |
| 2147 | cur += this_len; |
| 2148 | di = (struct btrfs_dir_item *)((char *)di + this_len); |
| 2149 | } |
| 2150 | } |
| 2151 | ret = btrfs_next_leaf(root, path); |
| 2152 | if (ret > 0) |
| 2153 | ret = 0; |
| 2154 | else if (ret == 0) |
| 2155 | goto process_leaf; |
| 2156 | out: |
| 2157 | btrfs_free_path(log_path); |
| 2158 | btrfs_release_path(path); |
| 2159 | return ret; |
| 2160 | } |
| 2161 | |
| 2162 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2163 | /* |
| 2164 | * deletion replay happens before we copy any new directory items |
| 2165 | * out of the log or out of backreferences from inodes. It |
| 2166 | * scans the log to find ranges of keys that log is authoritative for, |
| 2167 | * and then scans the directory to find items in those ranges that are |
| 2168 | * not present in the log. |
| 2169 | * |
| 2170 | * Anything we don't find in the log is unlinked and removed from the |
| 2171 | * directory. |
| 2172 | */ |
| 2173 | static noinline int replay_dir_deletes(struct btrfs_trans_handle *trans, |
| 2174 | struct btrfs_root *root, |
| 2175 | struct btrfs_root *log, |
| 2176 | struct btrfs_path *path, |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 2177 | u64 dirid, int del_all) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2178 | { |
| 2179 | u64 range_start; |
| 2180 | u64 range_end; |
| 2181 | int key_type = BTRFS_DIR_LOG_ITEM_KEY; |
| 2182 | int ret = 0; |
| 2183 | struct btrfs_key dir_key; |
| 2184 | struct btrfs_key found_key; |
| 2185 | struct btrfs_path *log_path; |
| 2186 | struct inode *dir; |
| 2187 | |
| 2188 | dir_key.objectid = dirid; |
| 2189 | dir_key.type = BTRFS_DIR_ITEM_KEY; |
| 2190 | log_path = btrfs_alloc_path(); |
| 2191 | if (!log_path) |
| 2192 | return -ENOMEM; |
| 2193 | |
| 2194 | dir = read_one_inode(root, dirid); |
| 2195 | /* it isn't an error if the inode isn't there, that can happen |
| 2196 | * because we replay the deletes before we copy in the inode item |
| 2197 | * from the log |
| 2198 | */ |
| 2199 | if (!dir) { |
| 2200 | btrfs_free_path(log_path); |
| 2201 | return 0; |
| 2202 | } |
| 2203 | again: |
| 2204 | range_start = 0; |
| 2205 | range_end = 0; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2206 | while (1) { |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 2207 | if (del_all) |
| 2208 | range_end = (u64)-1; |
| 2209 | else { |
| 2210 | ret = find_dir_range(log, path, dirid, key_type, |
| 2211 | &range_start, &range_end); |
| 2212 | if (ret != 0) |
| 2213 | break; |
| 2214 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2215 | |
| 2216 | dir_key.offset = range_start; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2217 | while (1) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2218 | int nritems; |
| 2219 | ret = btrfs_search_slot(NULL, root, &dir_key, path, |
| 2220 | 0, 0); |
| 2221 | if (ret < 0) |
| 2222 | goto out; |
| 2223 | |
| 2224 | nritems = btrfs_header_nritems(path->nodes[0]); |
| 2225 | if (path->slots[0] >= nritems) { |
| 2226 | ret = btrfs_next_leaf(root, path); |
| 2227 | if (ret) |
| 2228 | break; |
| 2229 | } |
| 2230 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, |
| 2231 | path->slots[0]); |
| 2232 | if (found_key.objectid != dirid || |
| 2233 | found_key.type != dir_key.type) |
| 2234 | goto next_type; |
| 2235 | |
| 2236 | if (found_key.offset > range_end) |
| 2237 | break; |
| 2238 | |
| 2239 | ret = check_item_in_log(trans, root, log, path, |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 2240 | log_path, dir, |
| 2241 | &found_key); |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 2242 | if (ret) |
| 2243 | goto out; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2244 | if (found_key.offset == (u64)-1) |
| 2245 | break; |
| 2246 | dir_key.offset = found_key.offset + 1; |
| 2247 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 2248 | btrfs_release_path(path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2249 | if (range_end == (u64)-1) |
| 2250 | break; |
| 2251 | range_start = range_end + 1; |
| 2252 | } |
| 2253 | |
| 2254 | next_type: |
| 2255 | ret = 0; |
| 2256 | if (key_type == BTRFS_DIR_LOG_ITEM_KEY) { |
| 2257 | key_type = BTRFS_DIR_LOG_INDEX_KEY; |
| 2258 | dir_key.type = BTRFS_DIR_INDEX_KEY; |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 2259 | btrfs_release_path(path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2260 | goto again; |
| 2261 | } |
| 2262 | out: |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 2263 | btrfs_release_path(path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2264 | btrfs_free_path(log_path); |
| 2265 | iput(dir); |
| 2266 | return ret; |
| 2267 | } |
| 2268 | |
| 2269 | /* |
| 2270 | * the process_func used to replay items from the log tree. This |
| 2271 | * gets called in two different stages. The first stage just looks |
| 2272 | * for inodes and makes sure they are all copied into the subvolume. |
| 2273 | * |
| 2274 | * The second stage copies all the other item types from the log into |
| 2275 | * the subvolume. The two stage approach is slower, but gets rid of |
| 2276 | * lots of complexity around inodes referencing other inodes that exist |
| 2277 | * only in the log (references come from either directory items or inode |
| 2278 | * back refs). |
| 2279 | */ |
| 2280 | static int replay_one_buffer(struct btrfs_root *log, struct extent_buffer *eb, |
| 2281 | struct walk_control *wc, u64 gen) |
| 2282 | { |
| 2283 | int nritems; |
| 2284 | struct btrfs_path *path; |
| 2285 | struct btrfs_root *root = wc->replay_dest; |
| 2286 | struct btrfs_key key; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2287 | int level; |
| 2288 | int i; |
| 2289 | int ret; |
| 2290 | |
Tsutomu Itoh | 018642a | 2012-05-29 18:10:13 +0900 | [diff] [blame] | 2291 | ret = btrfs_read_buffer(eb, gen); |
| 2292 | if (ret) |
| 2293 | return ret; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2294 | |
| 2295 | level = btrfs_header_level(eb); |
| 2296 | |
| 2297 | if (level != 0) |
| 2298 | return 0; |
| 2299 | |
| 2300 | path = btrfs_alloc_path(); |
Mark Fasheh | 1e5063d | 2011-07-12 10:46:06 -0700 | [diff] [blame] | 2301 | if (!path) |
| 2302 | return -ENOMEM; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2303 | |
| 2304 | nritems = btrfs_header_nritems(eb); |
| 2305 | for (i = 0; i < nritems; i++) { |
| 2306 | btrfs_item_key_to_cpu(eb, &key, i); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2307 | |
| 2308 | /* inode keys are done during the first stage */ |
| 2309 | if (key.type == BTRFS_INODE_ITEM_KEY && |
| 2310 | wc->stage == LOG_WALK_REPLAY_INODES) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2311 | struct btrfs_inode_item *inode_item; |
| 2312 | u32 mode; |
| 2313 | |
| 2314 | inode_item = btrfs_item_ptr(eb, i, |
| 2315 | struct btrfs_inode_item); |
Filipe Manana | 4f764e5 | 2015-02-23 19:53:35 +0000 | [diff] [blame] | 2316 | ret = replay_xattr_deletes(wc->trans, root, log, |
| 2317 | path, key.objectid); |
| 2318 | if (ret) |
| 2319 | break; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2320 | mode = btrfs_inode_mode(eb, inode_item); |
| 2321 | if (S_ISDIR(mode)) { |
| 2322 | ret = replay_dir_deletes(wc->trans, |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 2323 | root, log, path, key.objectid, 0); |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 2324 | if (ret) |
| 2325 | break; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2326 | } |
| 2327 | ret = overwrite_item(wc->trans, root, path, |
| 2328 | eb, i, &key); |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 2329 | if (ret) |
| 2330 | break; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2331 | |
Yan, Zheng | c71bf09 | 2009-11-12 09:34:40 +0000 | [diff] [blame] | 2332 | /* for regular files, make sure corresponding |
Nicholas D Steeves | 0132761 | 2016-05-19 21:18:45 -0400 | [diff] [blame] | 2333 | * orphan item exist. extents past the new EOF |
Yan, Zheng | c71bf09 | 2009-11-12 09:34:40 +0000 | [diff] [blame] | 2334 | * will be truncated later by orphan cleanup. |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2335 | */ |
| 2336 | if (S_ISREG(mode)) { |
Yan, Zheng | c71bf09 | 2009-11-12 09:34:40 +0000 | [diff] [blame] | 2337 | ret = insert_orphan_item(wc->trans, root, |
| 2338 | key.objectid); |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 2339 | if (ret) |
| 2340 | break; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2341 | } |
Yan, Zheng | c71bf09 | 2009-11-12 09:34:40 +0000 | [diff] [blame] | 2342 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2343 | ret = link_to_fixup_dir(wc->trans, root, |
| 2344 | path, key.objectid); |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 2345 | if (ret) |
| 2346 | break; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2347 | } |
Josef Bacik | dd8e721 | 2013-09-11 11:57:23 -0400 | [diff] [blame] | 2348 | |
| 2349 | if (key.type == BTRFS_DIR_INDEX_KEY && |
| 2350 | wc->stage == LOG_WALK_REPLAY_DIR_INDEX) { |
| 2351 | ret = replay_one_dir_item(wc->trans, root, path, |
| 2352 | eb, i, &key); |
| 2353 | if (ret) |
| 2354 | break; |
| 2355 | } |
| 2356 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2357 | if (wc->stage < LOG_WALK_REPLAY_ALL) |
| 2358 | continue; |
| 2359 | |
| 2360 | /* these keys are simply copied */ |
| 2361 | if (key.type == BTRFS_XATTR_ITEM_KEY) { |
| 2362 | ret = overwrite_item(wc->trans, root, path, |
| 2363 | eb, i, &key); |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 2364 | if (ret) |
| 2365 | break; |
Liu Bo | 2da1c66 | 2013-05-26 13:50:29 +0000 | [diff] [blame] | 2366 | } else if (key.type == BTRFS_INODE_REF_KEY || |
| 2367 | key.type == BTRFS_INODE_EXTREF_KEY) { |
Mark Fasheh | f186373 | 2012-08-08 11:32:27 -0700 | [diff] [blame] | 2368 | ret = add_inode_ref(wc->trans, root, log, path, |
| 2369 | eb, i, &key); |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 2370 | if (ret && ret != -ENOENT) |
| 2371 | break; |
| 2372 | ret = 0; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2373 | } else if (key.type == BTRFS_EXTENT_DATA_KEY) { |
| 2374 | ret = replay_one_extent(wc->trans, root, path, |
| 2375 | eb, i, &key); |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 2376 | if (ret) |
| 2377 | break; |
Josef Bacik | dd8e721 | 2013-09-11 11:57:23 -0400 | [diff] [blame] | 2378 | } else if (key.type == BTRFS_DIR_ITEM_KEY) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2379 | ret = replay_one_dir_item(wc->trans, root, path, |
| 2380 | eb, i, &key); |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 2381 | if (ret) |
| 2382 | break; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2383 | } |
| 2384 | } |
| 2385 | btrfs_free_path(path); |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 2386 | return ret; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2387 | } |
| 2388 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2389 | static noinline int walk_down_log_tree(struct btrfs_trans_handle *trans, |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2390 | struct btrfs_root *root, |
| 2391 | struct btrfs_path *path, int *level, |
| 2392 | struct walk_control *wc) |
| 2393 | { |
| 2394 | u64 root_owner; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2395 | u64 bytenr; |
| 2396 | u64 ptr_gen; |
| 2397 | struct extent_buffer *next; |
| 2398 | struct extent_buffer *cur; |
| 2399 | struct extent_buffer *parent; |
| 2400 | u32 blocksize; |
| 2401 | int ret = 0; |
| 2402 | |
| 2403 | WARN_ON(*level < 0); |
| 2404 | WARN_ON(*level >= BTRFS_MAX_LEVEL); |
| 2405 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2406 | while (*level > 0) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2407 | WARN_ON(*level < 0); |
| 2408 | WARN_ON(*level >= BTRFS_MAX_LEVEL); |
| 2409 | cur = path->nodes[*level]; |
| 2410 | |
Dulshani Gunawardhana | fae7f21 | 2013-10-31 10:30:08 +0530 | [diff] [blame] | 2411 | WARN_ON(btrfs_header_level(cur) != *level); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2412 | |
| 2413 | if (path->slots[*level] >= |
| 2414 | btrfs_header_nritems(cur)) |
| 2415 | break; |
| 2416 | |
| 2417 | bytenr = btrfs_node_blockptr(cur, path->slots[*level]); |
| 2418 | ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]); |
David Sterba | 707e8a0 | 2014-06-04 19:22:26 +0200 | [diff] [blame] | 2419 | blocksize = root->nodesize; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2420 | |
| 2421 | parent = path->nodes[*level]; |
| 2422 | root_owner = btrfs_header_owner(parent); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2423 | |
David Sterba | a83fffb | 2014-06-15 02:39:54 +0200 | [diff] [blame] | 2424 | next = btrfs_find_create_tree_block(root, bytenr); |
Liu Bo | c871b0f | 2016-06-06 12:01:23 -0700 | [diff] [blame] | 2425 | if (IS_ERR(next)) |
| 2426 | return PTR_ERR(next); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2427 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2428 | if (*level == 1) { |
Mark Fasheh | 1e5063d | 2011-07-12 10:46:06 -0700 | [diff] [blame] | 2429 | ret = wc->process_func(root, next, wc, ptr_gen); |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 2430 | if (ret) { |
| 2431 | free_extent_buffer(next); |
Mark Fasheh | 1e5063d | 2011-07-12 10:46:06 -0700 | [diff] [blame] | 2432 | return ret; |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 2433 | } |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2434 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2435 | path->slots[*level]++; |
| 2436 | if (wc->free) { |
Tsutomu Itoh | 018642a | 2012-05-29 18:10:13 +0900 | [diff] [blame] | 2437 | ret = btrfs_read_buffer(next, ptr_gen); |
| 2438 | if (ret) { |
| 2439 | free_extent_buffer(next); |
| 2440 | return ret; |
| 2441 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2442 | |
Josef Bacik | 681ae50 | 2013-10-07 15:11:00 -0400 | [diff] [blame] | 2443 | if (trans) { |
| 2444 | btrfs_tree_lock(next); |
| 2445 | btrfs_set_lock_blocking(next); |
Daniel Dressler | 01d5847 | 2014-11-21 17:15:07 +0900 | [diff] [blame] | 2446 | clean_tree_block(trans, root->fs_info, |
| 2447 | next); |
Josef Bacik | 681ae50 | 2013-10-07 15:11:00 -0400 | [diff] [blame] | 2448 | btrfs_wait_tree_block_writeback(next); |
| 2449 | btrfs_tree_unlock(next); |
| 2450 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2451 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2452 | WARN_ON(root_owner != |
| 2453 | BTRFS_TREE_LOG_OBJECTID); |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 2454 | ret = btrfs_free_and_pin_reserved_extent(root, |
Chris Mason | d00aff0 | 2008-09-11 15:54:42 -0400 | [diff] [blame] | 2455 | bytenr, blocksize); |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 2456 | if (ret) { |
| 2457 | free_extent_buffer(next); |
| 2458 | return ret; |
| 2459 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2460 | } |
| 2461 | free_extent_buffer(next); |
| 2462 | continue; |
| 2463 | } |
Tsutomu Itoh | 018642a | 2012-05-29 18:10:13 +0900 | [diff] [blame] | 2464 | ret = btrfs_read_buffer(next, ptr_gen); |
| 2465 | if (ret) { |
| 2466 | free_extent_buffer(next); |
| 2467 | return ret; |
| 2468 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2469 | |
| 2470 | WARN_ON(*level <= 0); |
| 2471 | if (path->nodes[*level-1]) |
| 2472 | free_extent_buffer(path->nodes[*level-1]); |
| 2473 | path->nodes[*level-1] = next; |
| 2474 | *level = btrfs_header_level(next); |
| 2475 | path->slots[*level] = 0; |
| 2476 | cond_resched(); |
| 2477 | } |
| 2478 | WARN_ON(*level < 0); |
| 2479 | WARN_ON(*level >= BTRFS_MAX_LEVEL); |
| 2480 | |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2481 | path->slots[*level] = btrfs_header_nritems(path->nodes[*level]); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2482 | |
| 2483 | cond_resched(); |
| 2484 | return 0; |
| 2485 | } |
| 2486 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2487 | static noinline int walk_up_log_tree(struct btrfs_trans_handle *trans, |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2488 | struct btrfs_root *root, |
| 2489 | struct btrfs_path *path, int *level, |
| 2490 | struct walk_control *wc) |
| 2491 | { |
| 2492 | u64 root_owner; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2493 | int i; |
| 2494 | int slot; |
| 2495 | int ret; |
| 2496 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2497 | for (i = *level; i < BTRFS_MAX_LEVEL - 1 && path->nodes[i]; i++) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2498 | slot = path->slots[i]; |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2499 | if (slot + 1 < btrfs_header_nritems(path->nodes[i])) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2500 | path->slots[i]++; |
| 2501 | *level = i; |
| 2502 | WARN_ON(*level == 0); |
| 2503 | return 0; |
| 2504 | } else { |
Zheng Yan | 31840ae | 2008-09-23 13:14:14 -0400 | [diff] [blame] | 2505 | struct extent_buffer *parent; |
| 2506 | if (path->nodes[*level] == root->node) |
| 2507 | parent = path->nodes[*level]; |
| 2508 | else |
| 2509 | parent = path->nodes[*level + 1]; |
| 2510 | |
| 2511 | root_owner = btrfs_header_owner(parent); |
Mark Fasheh | 1e5063d | 2011-07-12 10:46:06 -0700 | [diff] [blame] | 2512 | ret = wc->process_func(root, path->nodes[*level], wc, |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2513 | btrfs_header_generation(path->nodes[*level])); |
Mark Fasheh | 1e5063d | 2011-07-12 10:46:06 -0700 | [diff] [blame] | 2514 | if (ret) |
| 2515 | return ret; |
| 2516 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2517 | if (wc->free) { |
| 2518 | struct extent_buffer *next; |
| 2519 | |
| 2520 | next = path->nodes[*level]; |
| 2521 | |
Josef Bacik | 681ae50 | 2013-10-07 15:11:00 -0400 | [diff] [blame] | 2522 | if (trans) { |
| 2523 | btrfs_tree_lock(next); |
| 2524 | btrfs_set_lock_blocking(next); |
Daniel Dressler | 01d5847 | 2014-11-21 17:15:07 +0900 | [diff] [blame] | 2525 | clean_tree_block(trans, root->fs_info, |
| 2526 | next); |
Josef Bacik | 681ae50 | 2013-10-07 15:11:00 -0400 | [diff] [blame] | 2527 | btrfs_wait_tree_block_writeback(next); |
| 2528 | btrfs_tree_unlock(next); |
| 2529 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2530 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2531 | WARN_ON(root_owner != BTRFS_TREE_LOG_OBJECTID); |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 2532 | ret = btrfs_free_and_pin_reserved_extent(root, |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2533 | path->nodes[*level]->start, |
Chris Mason | d00aff0 | 2008-09-11 15:54:42 -0400 | [diff] [blame] | 2534 | path->nodes[*level]->len); |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 2535 | if (ret) |
| 2536 | return ret; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2537 | } |
| 2538 | free_extent_buffer(path->nodes[*level]); |
| 2539 | path->nodes[*level] = NULL; |
| 2540 | *level = i + 1; |
| 2541 | } |
| 2542 | } |
| 2543 | return 1; |
| 2544 | } |
| 2545 | |
| 2546 | /* |
| 2547 | * drop the reference count on the tree rooted at 'snap'. This traverses |
| 2548 | * the tree freeing any blocks that have a ref count of zero after being |
| 2549 | * decremented. |
| 2550 | */ |
| 2551 | static int walk_log_tree(struct btrfs_trans_handle *trans, |
| 2552 | struct btrfs_root *log, struct walk_control *wc) |
| 2553 | { |
| 2554 | int ret = 0; |
| 2555 | int wret; |
| 2556 | int level; |
| 2557 | struct btrfs_path *path; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2558 | int orig_level; |
| 2559 | |
| 2560 | path = btrfs_alloc_path(); |
Tsutomu Itoh | db5b493 | 2011-03-23 08:14:16 +0000 | [diff] [blame] | 2561 | if (!path) |
| 2562 | return -ENOMEM; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2563 | |
| 2564 | level = btrfs_header_level(log->node); |
| 2565 | orig_level = level; |
| 2566 | path->nodes[level] = log->node; |
| 2567 | extent_buffer_get(log->node); |
| 2568 | path->slots[level] = 0; |
| 2569 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2570 | while (1) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2571 | wret = walk_down_log_tree(trans, log, path, &level, wc); |
| 2572 | if (wret > 0) |
| 2573 | break; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2574 | if (wret < 0) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2575 | ret = wret; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2576 | goto out; |
| 2577 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2578 | |
| 2579 | wret = walk_up_log_tree(trans, log, path, &level, wc); |
| 2580 | if (wret > 0) |
| 2581 | break; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2582 | if (wret < 0) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2583 | ret = wret; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2584 | goto out; |
| 2585 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2586 | } |
| 2587 | |
| 2588 | /* was the root node processed? if not, catch it here */ |
| 2589 | if (path->nodes[orig_level]) { |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2590 | ret = wc->process_func(log, path->nodes[orig_level], wc, |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2591 | btrfs_header_generation(path->nodes[orig_level])); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2592 | if (ret) |
| 2593 | goto out; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2594 | if (wc->free) { |
| 2595 | struct extent_buffer *next; |
| 2596 | |
| 2597 | next = path->nodes[orig_level]; |
| 2598 | |
Josef Bacik | 681ae50 | 2013-10-07 15:11:00 -0400 | [diff] [blame] | 2599 | if (trans) { |
| 2600 | btrfs_tree_lock(next); |
| 2601 | btrfs_set_lock_blocking(next); |
Daniel Dressler | 01d5847 | 2014-11-21 17:15:07 +0900 | [diff] [blame] | 2602 | clean_tree_block(trans, log->fs_info, next); |
Josef Bacik | 681ae50 | 2013-10-07 15:11:00 -0400 | [diff] [blame] | 2603 | btrfs_wait_tree_block_writeback(next); |
| 2604 | btrfs_tree_unlock(next); |
| 2605 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2606 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2607 | WARN_ON(log->root_key.objectid != |
| 2608 | BTRFS_TREE_LOG_OBJECTID); |
Chris Mason | e688b725 | 2011-10-31 20:52:39 -0400 | [diff] [blame] | 2609 | ret = btrfs_free_and_pin_reserved_extent(log, next->start, |
Chris Mason | d00aff0 | 2008-09-11 15:54:42 -0400 | [diff] [blame] | 2610 | next->len); |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 2611 | if (ret) |
| 2612 | goto out; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2613 | } |
| 2614 | } |
| 2615 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2616 | out: |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2617 | btrfs_free_path(path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2618 | return ret; |
| 2619 | } |
| 2620 | |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2621 | /* |
| 2622 | * helper function to update the item for a given subvolumes log root |
| 2623 | * in the tree of log roots |
| 2624 | */ |
| 2625 | static int update_log_root(struct btrfs_trans_handle *trans, |
| 2626 | struct btrfs_root *log) |
| 2627 | { |
| 2628 | int ret; |
| 2629 | |
| 2630 | if (log->log_transid == 1) { |
| 2631 | /* insert root item on the first sync */ |
| 2632 | ret = btrfs_insert_root(trans, log->fs_info->log_root_tree, |
| 2633 | &log->root_key, &log->root_item); |
| 2634 | } else { |
| 2635 | ret = btrfs_update_root(trans, log->fs_info->log_root_tree, |
| 2636 | &log->root_key, &log->root_item); |
| 2637 | } |
| 2638 | return ret; |
| 2639 | } |
| 2640 | |
Zhaolei | 60d53eb | 2015-08-17 18:44:46 +0800 | [diff] [blame] | 2641 | static void wait_log_commit(struct btrfs_root *root, int transid) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2642 | { |
| 2643 | DEFINE_WAIT(wait); |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2644 | int index = transid % 2; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2645 | |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2646 | /* |
| 2647 | * we only allow two pending log transactions at a time, |
| 2648 | * so we know that if ours is more than 2 older than the |
| 2649 | * current transaction, we're done |
| 2650 | */ |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2651 | do { |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2652 | prepare_to_wait(&root->log_commit_wait[index], |
| 2653 | &wait, TASK_UNINTERRUPTIBLE); |
| 2654 | mutex_unlock(&root->log_mutex); |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 2655 | |
Miao Xie | d1433de | 2014-02-20 18:08:59 +0800 | [diff] [blame] | 2656 | if (root->log_transid_committed < transid && |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2657 | atomic_read(&root->log_commit[index])) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2658 | schedule(); |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 2659 | |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2660 | finish_wait(&root->log_commit_wait[index], &wait); |
| 2661 | mutex_lock(&root->log_mutex); |
Miao Xie | d1433de | 2014-02-20 18:08:59 +0800 | [diff] [blame] | 2662 | } while (root->log_transid_committed < transid && |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2663 | atomic_read(&root->log_commit[index])); |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2664 | } |
| 2665 | |
Zhaolei | 60d53eb | 2015-08-17 18:44:46 +0800 | [diff] [blame] | 2666 | static void wait_for_writer(struct btrfs_root *root) |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2667 | { |
| 2668 | DEFINE_WAIT(wait); |
Miao Xie | 8b050d3 | 2014-02-20 18:08:58 +0800 | [diff] [blame] | 2669 | |
| 2670 | while (atomic_read(&root->log_writers)) { |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2671 | prepare_to_wait(&root->log_writer_wait, |
| 2672 | &wait, TASK_UNINTERRUPTIBLE); |
| 2673 | mutex_unlock(&root->log_mutex); |
Miao Xie | 8b050d3 | 2014-02-20 18:08:58 +0800 | [diff] [blame] | 2674 | if (atomic_read(&root->log_writers)) |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2675 | schedule(); |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2676 | finish_wait(&root->log_writer_wait, &wait); |
Filipe Manana | 575849e | 2015-02-11 11:12:39 +0000 | [diff] [blame] | 2677 | mutex_lock(&root->log_mutex); |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2678 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2679 | } |
| 2680 | |
Miao Xie | 8b050d3 | 2014-02-20 18:08:58 +0800 | [diff] [blame] | 2681 | static inline void btrfs_remove_log_ctx(struct btrfs_root *root, |
| 2682 | struct btrfs_log_ctx *ctx) |
| 2683 | { |
| 2684 | if (!ctx) |
| 2685 | return; |
| 2686 | |
| 2687 | mutex_lock(&root->log_mutex); |
| 2688 | list_del_init(&ctx->list); |
| 2689 | mutex_unlock(&root->log_mutex); |
| 2690 | } |
| 2691 | |
| 2692 | /* |
| 2693 | * Invoked in log mutex context, or be sure there is no other task which |
| 2694 | * can access the list. |
| 2695 | */ |
| 2696 | static inline void btrfs_remove_all_log_ctxs(struct btrfs_root *root, |
| 2697 | int index, int error) |
| 2698 | { |
| 2699 | struct btrfs_log_ctx *ctx; |
| 2700 | |
| 2701 | if (!error) { |
| 2702 | INIT_LIST_HEAD(&root->log_ctxs[index]); |
| 2703 | return; |
| 2704 | } |
| 2705 | |
| 2706 | list_for_each_entry(ctx, &root->log_ctxs[index], list) |
| 2707 | ctx->log_ret = error; |
| 2708 | |
| 2709 | INIT_LIST_HEAD(&root->log_ctxs[index]); |
| 2710 | } |
| 2711 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2712 | /* |
| 2713 | * btrfs_sync_log does sends a given tree log down to the disk and |
| 2714 | * updates the super blocks to record it. When this call is done, |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 2715 | * you know that any inodes previously logged are safely on disk only |
| 2716 | * if it returns 0. |
| 2717 | * |
| 2718 | * Any other return value means you need to call btrfs_commit_transaction. |
| 2719 | * Some of the edge cases for fsyncing directories that have had unlinks |
| 2720 | * or renames done in the past mean that sometimes the only safe |
| 2721 | * fsync is to commit the whole FS. When btrfs_sync_log returns -EAGAIN, |
| 2722 | * that has happened. |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2723 | */ |
| 2724 | int btrfs_sync_log(struct btrfs_trans_handle *trans, |
Miao Xie | 8b050d3 | 2014-02-20 18:08:58 +0800 | [diff] [blame] | 2725 | struct btrfs_root *root, struct btrfs_log_ctx *ctx) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2726 | { |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2727 | int index1; |
| 2728 | int index2; |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 2729 | int mark; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2730 | int ret; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2731 | struct btrfs_root *log = root->log_root; |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2732 | struct btrfs_root *log_root_tree = root->fs_info->log_root_tree; |
Miao Xie | bb14a59 | 2014-02-20 18:08:56 +0800 | [diff] [blame] | 2733 | int log_transid = 0; |
Miao Xie | 8b050d3 | 2014-02-20 18:08:58 +0800 | [diff] [blame] | 2734 | struct btrfs_log_ctx root_log_ctx; |
Miao Xie | c6adc9c | 2013-05-28 10:05:39 +0000 | [diff] [blame] | 2735 | struct blk_plug plug; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2736 | |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2737 | mutex_lock(&root->log_mutex); |
Miao Xie | d1433de | 2014-02-20 18:08:59 +0800 | [diff] [blame] | 2738 | log_transid = ctx->log_transid; |
| 2739 | if (root->log_transid_committed >= log_transid) { |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2740 | mutex_unlock(&root->log_mutex); |
Miao Xie | 8b050d3 | 2014-02-20 18:08:58 +0800 | [diff] [blame] | 2741 | return ctx->log_ret; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2742 | } |
Miao Xie | d1433de | 2014-02-20 18:08:59 +0800 | [diff] [blame] | 2743 | |
| 2744 | index1 = log_transid % 2; |
| 2745 | if (atomic_read(&root->log_commit[index1])) { |
Zhaolei | 60d53eb | 2015-08-17 18:44:46 +0800 | [diff] [blame] | 2746 | wait_log_commit(root, log_transid); |
Miao Xie | d1433de | 2014-02-20 18:08:59 +0800 | [diff] [blame] | 2747 | mutex_unlock(&root->log_mutex); |
| 2748 | return ctx->log_ret; |
| 2749 | } |
| 2750 | ASSERT(log_transid == root->log_transid); |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2751 | atomic_set(&root->log_commit[index1], 1); |
| 2752 | |
| 2753 | /* wait for previous tree log sync to complete */ |
| 2754 | if (atomic_read(&root->log_commit[(index1 + 1) % 2])) |
Zhaolei | 60d53eb | 2015-08-17 18:44:46 +0800 | [diff] [blame] | 2755 | wait_log_commit(root, log_transid - 1); |
Miao Xie | 48cab2e | 2014-02-20 18:08:52 +0800 | [diff] [blame] | 2756 | |
Yan, Zheng | 86df7eb | 2009-10-14 09:24:59 -0400 | [diff] [blame] | 2757 | while (1) { |
Miao Xie | 2ecb792 | 2012-09-06 04:04:27 -0600 | [diff] [blame] | 2758 | int batch = atomic_read(&root->log_batch); |
Chris Mason | cd354ad | 2011-10-20 15:45:37 -0400 | [diff] [blame] | 2759 | /* when we're on an ssd, just kick the log commit out */ |
Jeff Mahoney | 3cdde22 | 2016-06-09 21:38:35 -0400 | [diff] [blame] | 2760 | if (!btrfs_test_opt(root->fs_info, SSD) && |
Miao Xie | 27cdeb7 | 2014-04-02 19:51:05 +0800 | [diff] [blame] | 2761 | test_bit(BTRFS_ROOT_MULTI_LOG_TASKS, &root->state)) { |
Yan, Zheng | 86df7eb | 2009-10-14 09:24:59 -0400 | [diff] [blame] | 2762 | mutex_unlock(&root->log_mutex); |
| 2763 | schedule_timeout_uninterruptible(1); |
| 2764 | mutex_lock(&root->log_mutex); |
| 2765 | } |
Zhaolei | 60d53eb | 2015-08-17 18:44:46 +0800 | [diff] [blame] | 2766 | wait_for_writer(root); |
Miao Xie | 2ecb792 | 2012-09-06 04:04:27 -0600 | [diff] [blame] | 2767 | if (batch == atomic_read(&root->log_batch)) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2768 | break; |
| 2769 | } |
Chris Mason | d0c803c | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 2770 | |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 2771 | /* bail out if we need to do a full commit */ |
Miao Xie | 995946d | 2014-04-02 19:51:06 +0800 | [diff] [blame] | 2772 | if (btrfs_need_log_full_commit(root->fs_info, trans)) { |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 2773 | ret = -EAGAIN; |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 2774 | btrfs_free_logged_extents(log, log_transid); |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 2775 | mutex_unlock(&root->log_mutex); |
| 2776 | goto out; |
| 2777 | } |
| 2778 | |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 2779 | if (log_transid % 2 == 0) |
| 2780 | mark = EXTENT_DIRTY; |
| 2781 | else |
| 2782 | mark = EXTENT_NEW; |
| 2783 | |
Chris Mason | 690587d | 2009-10-13 13:29:19 -0400 | [diff] [blame] | 2784 | /* we start IO on all the marked extents here, but we don't actually |
| 2785 | * wait for them until later. |
| 2786 | */ |
Miao Xie | c6adc9c | 2013-05-28 10:05:39 +0000 | [diff] [blame] | 2787 | blk_start_plug(&plug); |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 2788 | ret = btrfs_write_marked_extents(log, &log->dirty_log_pages, mark); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2789 | if (ret) { |
Miao Xie | c6adc9c | 2013-05-28 10:05:39 +0000 | [diff] [blame] | 2790 | blk_finish_plug(&plug); |
Jeff Mahoney | 6664283 | 2016-06-10 18:19:25 -0400 | [diff] [blame] | 2791 | btrfs_abort_transaction(trans, ret); |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 2792 | btrfs_free_logged_extents(log, log_transid); |
Miao Xie | 995946d | 2014-04-02 19:51:06 +0800 | [diff] [blame] | 2793 | btrfs_set_log_full_commit(root->fs_info, trans); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2794 | mutex_unlock(&root->log_mutex); |
| 2795 | goto out; |
| 2796 | } |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2797 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2798 | btrfs_set_root_node(&log->root_item, log->node); |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2799 | |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2800 | root->log_transid++; |
| 2801 | log->log_transid = root->log_transid; |
Josef Bacik | ff782e0 | 2009-10-08 15:30:04 -0400 | [diff] [blame] | 2802 | root->log_start_pid = 0; |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2803 | /* |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 2804 | * IO has been started, blocks of the log tree have WRITTEN flag set |
| 2805 | * in their headers. new modifications of the log will be written to |
| 2806 | * new positions. so it's safe to allow log writers to go in. |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2807 | */ |
| 2808 | mutex_unlock(&root->log_mutex); |
| 2809 | |
Miao Xie | d1433de | 2014-02-20 18:08:59 +0800 | [diff] [blame] | 2810 | btrfs_init_log_ctx(&root_log_ctx); |
| 2811 | |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2812 | mutex_lock(&log_root_tree->log_mutex); |
Miao Xie | 2ecb792 | 2012-09-06 04:04:27 -0600 | [diff] [blame] | 2813 | atomic_inc(&log_root_tree->log_batch); |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2814 | atomic_inc(&log_root_tree->log_writers); |
Miao Xie | d1433de | 2014-02-20 18:08:59 +0800 | [diff] [blame] | 2815 | |
| 2816 | index2 = log_root_tree->log_transid % 2; |
| 2817 | list_add_tail(&root_log_ctx.list, &log_root_tree->log_ctxs[index2]); |
| 2818 | root_log_ctx.log_transid = log_root_tree->log_transid; |
| 2819 | |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2820 | mutex_unlock(&log_root_tree->log_mutex); |
| 2821 | |
| 2822 | ret = update_log_root(trans, log); |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2823 | |
| 2824 | mutex_lock(&log_root_tree->log_mutex); |
| 2825 | if (atomic_dec_and_test(&log_root_tree->log_writers)) { |
David Sterba | 779adf0 | 2015-02-16 19:39:00 +0100 | [diff] [blame] | 2826 | /* |
| 2827 | * Implicit memory barrier after atomic_dec_and_test |
| 2828 | */ |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2829 | if (waitqueue_active(&log_root_tree->log_writer_wait)) |
| 2830 | wake_up(&log_root_tree->log_writer_wait); |
| 2831 | } |
| 2832 | |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2833 | if (ret) { |
Miao Xie | d1433de | 2014-02-20 18:08:59 +0800 | [diff] [blame] | 2834 | if (!list_empty(&root_log_ctx.list)) |
| 2835 | list_del_init(&root_log_ctx.list); |
| 2836 | |
Miao Xie | c6adc9c | 2013-05-28 10:05:39 +0000 | [diff] [blame] | 2837 | blk_finish_plug(&plug); |
Miao Xie | 995946d | 2014-04-02 19:51:06 +0800 | [diff] [blame] | 2838 | btrfs_set_log_full_commit(root->fs_info, trans); |
| 2839 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2840 | if (ret != -ENOSPC) { |
Jeff Mahoney | 6664283 | 2016-06-10 18:19:25 -0400 | [diff] [blame] | 2841 | btrfs_abort_transaction(trans, ret); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2842 | mutex_unlock(&log_root_tree->log_mutex); |
| 2843 | goto out; |
| 2844 | } |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2845 | btrfs_wait_marked_extents(log, &log->dirty_log_pages, mark); |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 2846 | btrfs_free_logged_extents(log, log_transid); |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2847 | mutex_unlock(&log_root_tree->log_mutex); |
| 2848 | ret = -EAGAIN; |
| 2849 | goto out; |
| 2850 | } |
| 2851 | |
Miao Xie | d1433de | 2014-02-20 18:08:59 +0800 | [diff] [blame] | 2852 | if (log_root_tree->log_transid_committed >= root_log_ctx.log_transid) { |
Forrest Liu | 3da5ab5 | 2015-01-30 19:42:12 +0800 | [diff] [blame] | 2853 | blk_finish_plug(&plug); |
Miao Xie | d1433de | 2014-02-20 18:08:59 +0800 | [diff] [blame] | 2854 | mutex_unlock(&log_root_tree->log_mutex); |
| 2855 | ret = root_log_ctx.log_ret; |
| 2856 | goto out; |
| 2857 | } |
Miao Xie | 8b050d3 | 2014-02-20 18:08:58 +0800 | [diff] [blame] | 2858 | |
Miao Xie | d1433de | 2014-02-20 18:08:59 +0800 | [diff] [blame] | 2859 | index2 = root_log_ctx.log_transid % 2; |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2860 | if (atomic_read(&log_root_tree->log_commit[index2])) { |
Miao Xie | c6adc9c | 2013-05-28 10:05:39 +0000 | [diff] [blame] | 2861 | blk_finish_plug(&plug); |
Filipe Manana | 5ab5e44 | 2014-11-13 16:59:53 +0000 | [diff] [blame] | 2862 | ret = btrfs_wait_marked_extents(log, &log->dirty_log_pages, |
| 2863 | mark); |
Josef Bacik | 50d9aa9 | 2014-11-21 14:52:38 -0500 | [diff] [blame] | 2864 | btrfs_wait_logged_extents(trans, log, log_transid); |
Zhaolei | 60d53eb | 2015-08-17 18:44:46 +0800 | [diff] [blame] | 2865 | wait_log_commit(log_root_tree, |
Miao Xie | d1433de | 2014-02-20 18:08:59 +0800 | [diff] [blame] | 2866 | root_log_ctx.log_transid); |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2867 | mutex_unlock(&log_root_tree->log_mutex); |
Filipe Manana | 5ab5e44 | 2014-11-13 16:59:53 +0000 | [diff] [blame] | 2868 | if (!ret) |
| 2869 | ret = root_log_ctx.log_ret; |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2870 | goto out; |
| 2871 | } |
Miao Xie | d1433de | 2014-02-20 18:08:59 +0800 | [diff] [blame] | 2872 | ASSERT(root_log_ctx.log_transid == log_root_tree->log_transid); |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2873 | atomic_set(&log_root_tree->log_commit[index2], 1); |
| 2874 | |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 2875 | if (atomic_read(&log_root_tree->log_commit[(index2 + 1) % 2])) { |
Zhaolei | 60d53eb | 2015-08-17 18:44:46 +0800 | [diff] [blame] | 2876 | wait_log_commit(log_root_tree, |
Miao Xie | d1433de | 2014-02-20 18:08:59 +0800 | [diff] [blame] | 2877 | root_log_ctx.log_transid - 1); |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 2878 | } |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2879 | |
Zhaolei | 60d53eb | 2015-08-17 18:44:46 +0800 | [diff] [blame] | 2880 | wait_for_writer(log_root_tree); |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 2881 | |
| 2882 | /* |
| 2883 | * now that we've moved on to the tree of log tree roots, |
| 2884 | * check the full commit flag again |
| 2885 | */ |
Miao Xie | 995946d | 2014-04-02 19:51:06 +0800 | [diff] [blame] | 2886 | if (btrfs_need_log_full_commit(root->fs_info, trans)) { |
Miao Xie | c6adc9c | 2013-05-28 10:05:39 +0000 | [diff] [blame] | 2887 | blk_finish_plug(&plug); |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 2888 | btrfs_wait_marked_extents(log, &log->dirty_log_pages, mark); |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 2889 | btrfs_free_logged_extents(log, log_transid); |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 2890 | mutex_unlock(&log_root_tree->log_mutex); |
| 2891 | ret = -EAGAIN; |
| 2892 | goto out_wake_log_root; |
| 2893 | } |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2894 | |
Miao Xie | c6adc9c | 2013-05-28 10:05:39 +0000 | [diff] [blame] | 2895 | ret = btrfs_write_marked_extents(log_root_tree, |
| 2896 | &log_root_tree->dirty_log_pages, |
| 2897 | EXTENT_DIRTY | EXTENT_NEW); |
| 2898 | blk_finish_plug(&plug); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2899 | if (ret) { |
Miao Xie | 995946d | 2014-04-02 19:51:06 +0800 | [diff] [blame] | 2900 | btrfs_set_log_full_commit(root->fs_info, trans); |
Jeff Mahoney | 6664283 | 2016-06-10 18:19:25 -0400 | [diff] [blame] | 2901 | btrfs_abort_transaction(trans, ret); |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 2902 | btrfs_free_logged_extents(log, log_transid); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2903 | mutex_unlock(&log_root_tree->log_mutex); |
| 2904 | goto out_wake_log_root; |
| 2905 | } |
Filipe Manana | 5ab5e44 | 2014-11-13 16:59:53 +0000 | [diff] [blame] | 2906 | ret = btrfs_wait_marked_extents(log, &log->dirty_log_pages, mark); |
| 2907 | if (!ret) |
| 2908 | ret = btrfs_wait_marked_extents(log_root_tree, |
| 2909 | &log_root_tree->dirty_log_pages, |
| 2910 | EXTENT_NEW | EXTENT_DIRTY); |
| 2911 | if (ret) { |
| 2912 | btrfs_set_log_full_commit(root->fs_info, trans); |
| 2913 | btrfs_free_logged_extents(log, log_transid); |
| 2914 | mutex_unlock(&log_root_tree->log_mutex); |
| 2915 | goto out_wake_log_root; |
| 2916 | } |
Josef Bacik | 50d9aa9 | 2014-11-21 14:52:38 -0500 | [diff] [blame] | 2917 | btrfs_wait_logged_extents(trans, log, log_transid); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2918 | |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 2919 | btrfs_set_super_log_root(root->fs_info->super_for_commit, |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2920 | log_root_tree->node->start); |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 2921 | btrfs_set_super_log_root_level(root->fs_info->super_for_commit, |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2922 | btrfs_header_level(log_root_tree->node)); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2923 | |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2924 | log_root_tree->log_transid++; |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2925 | mutex_unlock(&log_root_tree->log_mutex); |
| 2926 | |
| 2927 | /* |
| 2928 | * nobody else is going to jump in and write the the ctree |
| 2929 | * super here because the log_commit atomic below is protecting |
| 2930 | * us. We must be called with a transaction handle pinning |
| 2931 | * the running transaction open, so a full commit can't hop |
| 2932 | * in and cause problems either. |
| 2933 | */ |
Stefan Behrens | 5af3e8c | 2012-08-01 18:56:49 +0200 | [diff] [blame] | 2934 | ret = write_ctree_super(trans, root->fs_info->tree_root, 1); |
Stefan Behrens | 5af3e8c | 2012-08-01 18:56:49 +0200 | [diff] [blame] | 2935 | if (ret) { |
Miao Xie | 995946d | 2014-04-02 19:51:06 +0800 | [diff] [blame] | 2936 | btrfs_set_log_full_commit(root->fs_info, trans); |
Jeff Mahoney | 6664283 | 2016-06-10 18:19:25 -0400 | [diff] [blame] | 2937 | btrfs_abort_transaction(trans, ret); |
Stefan Behrens | 5af3e8c | 2012-08-01 18:56:49 +0200 | [diff] [blame] | 2938 | goto out_wake_log_root; |
| 2939 | } |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2940 | |
Chris Mason | 257c62e | 2009-10-13 13:21:08 -0400 | [diff] [blame] | 2941 | mutex_lock(&root->log_mutex); |
| 2942 | if (root->last_log_commit < log_transid) |
| 2943 | root->last_log_commit = log_transid; |
| 2944 | mutex_unlock(&root->log_mutex); |
| 2945 | |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 2946 | out_wake_log_root: |
Miao Xie | 8b050d3 | 2014-02-20 18:08:58 +0800 | [diff] [blame] | 2947 | /* |
| 2948 | * We needn't get log_mutex here because we are sure all |
| 2949 | * the other tasks are blocked. |
| 2950 | */ |
| 2951 | btrfs_remove_all_log_ctxs(log_root_tree, index2, ret); |
| 2952 | |
Miao Xie | d1433de | 2014-02-20 18:08:59 +0800 | [diff] [blame] | 2953 | mutex_lock(&log_root_tree->log_mutex); |
| 2954 | log_root_tree->log_transid_committed++; |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2955 | atomic_set(&log_root_tree->log_commit[index2], 0); |
Miao Xie | d1433de | 2014-02-20 18:08:59 +0800 | [diff] [blame] | 2956 | mutex_unlock(&log_root_tree->log_mutex); |
| 2957 | |
David Sterba | 33a9eca | 2015-10-10 18:35:10 +0200 | [diff] [blame] | 2958 | /* |
| 2959 | * The barrier before waitqueue_active is implied by mutex_unlock |
| 2960 | */ |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2961 | if (waitqueue_active(&log_root_tree->log_commit_wait[index2])) |
| 2962 | wake_up(&log_root_tree->log_commit_wait[index2]); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2963 | out: |
Miao Xie | 8b050d3 | 2014-02-20 18:08:58 +0800 | [diff] [blame] | 2964 | /* See above. */ |
| 2965 | btrfs_remove_all_log_ctxs(root, index1, ret); |
| 2966 | |
Miao Xie | d1433de | 2014-02-20 18:08:59 +0800 | [diff] [blame] | 2967 | mutex_lock(&root->log_mutex); |
| 2968 | root->log_transid_committed++; |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2969 | atomic_set(&root->log_commit[index1], 0); |
Miao Xie | d1433de | 2014-02-20 18:08:59 +0800 | [diff] [blame] | 2970 | mutex_unlock(&root->log_mutex); |
Miao Xie | 8b050d3 | 2014-02-20 18:08:58 +0800 | [diff] [blame] | 2971 | |
David Sterba | 33a9eca | 2015-10-10 18:35:10 +0200 | [diff] [blame] | 2972 | /* |
| 2973 | * The barrier before waitqueue_active is implied by mutex_unlock |
| 2974 | */ |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 2975 | if (waitqueue_active(&root->log_commit_wait[index1])) |
| 2976 | wake_up(&root->log_commit_wait[index1]); |
Chris Mason | b31eabd | 2011-01-31 16:48:24 -0500 | [diff] [blame] | 2977 | return ret; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2978 | } |
| 2979 | |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 2980 | static void free_log_tree(struct btrfs_trans_handle *trans, |
| 2981 | struct btrfs_root *log) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2982 | { |
| 2983 | int ret; |
Chris Mason | d0c803c | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 2984 | u64 start; |
| 2985 | u64 end; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2986 | struct walk_control wc = { |
| 2987 | .free = 1, |
| 2988 | .process_func = process_one_buffer |
| 2989 | }; |
| 2990 | |
Josef Bacik | 681ae50 | 2013-10-07 15:11:00 -0400 | [diff] [blame] | 2991 | ret = walk_log_tree(trans, log, &wc); |
| 2992 | /* I don't think this can happen but just in case */ |
| 2993 | if (ret) |
Jeff Mahoney | 6664283 | 2016-06-10 18:19:25 -0400 | [diff] [blame] | 2994 | btrfs_abort_transaction(trans, ret); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2995 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2996 | while (1) { |
Chris Mason | d0c803c | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 2997 | ret = find_first_extent_bit(&log->dirty_log_pages, |
Josef Bacik | e613887 | 2012-09-27 17:07:30 -0400 | [diff] [blame] | 2998 | 0, &start, &end, EXTENT_DIRTY | EXTENT_NEW, |
| 2999 | NULL); |
Chris Mason | d0c803c | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 3000 | if (ret) |
| 3001 | break; |
| 3002 | |
Yan, Zheng | 8cef4e1 | 2009-11-12 09:33:26 +0000 | [diff] [blame] | 3003 | clear_extent_bits(&log->dirty_log_pages, start, end, |
David Sterba | 9116621 | 2016-04-26 23:54:39 +0200 | [diff] [blame] | 3004 | EXTENT_DIRTY | EXTENT_NEW); |
Chris Mason | d0c803c | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 3005 | } |
| 3006 | |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 3007 | /* |
| 3008 | * We may have short-circuited the log tree with the full commit logic |
| 3009 | * and left ordered extents on our list, so clear these out to keep us |
| 3010 | * from leaking inodes and memory. |
| 3011 | */ |
| 3012 | btrfs_free_logged_extents(log, 0); |
| 3013 | btrfs_free_logged_extents(log, 1); |
| 3014 | |
Yan Zheng | 7237f18 | 2009-01-21 12:54:03 -0500 | [diff] [blame] | 3015 | free_extent_buffer(log->node); |
| 3016 | kfree(log); |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3017 | } |
| 3018 | |
| 3019 | /* |
| 3020 | * free all the extents used by the tree log. This should be called |
| 3021 | * at commit time of the full transaction |
| 3022 | */ |
| 3023 | int btrfs_free_log(struct btrfs_trans_handle *trans, struct btrfs_root *root) |
| 3024 | { |
| 3025 | if (root->log_root) { |
| 3026 | free_log_tree(trans, root->log_root); |
| 3027 | root->log_root = NULL; |
| 3028 | } |
| 3029 | return 0; |
| 3030 | } |
| 3031 | |
| 3032 | int btrfs_free_log_root_tree(struct btrfs_trans_handle *trans, |
| 3033 | struct btrfs_fs_info *fs_info) |
| 3034 | { |
| 3035 | if (fs_info->log_root_tree) { |
| 3036 | free_log_tree(trans, fs_info->log_root_tree); |
| 3037 | fs_info->log_root_tree = NULL; |
| 3038 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3039 | return 0; |
| 3040 | } |
| 3041 | |
| 3042 | /* |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3043 | * If both a file and directory are logged, and unlinks or renames are |
| 3044 | * mixed in, we have a few interesting corners: |
| 3045 | * |
| 3046 | * create file X in dir Y |
| 3047 | * link file X to X.link in dir Y |
| 3048 | * fsync file X |
| 3049 | * unlink file X but leave X.link |
| 3050 | * fsync dir Y |
| 3051 | * |
| 3052 | * After a crash we would expect only X.link to exist. But file X |
| 3053 | * didn't get fsync'd again so the log has back refs for X and X.link. |
| 3054 | * |
| 3055 | * We solve this by removing directory entries and inode backrefs from the |
| 3056 | * log when a file that was logged in the current transaction is |
| 3057 | * unlinked. Any later fsync will include the updated log entries, and |
| 3058 | * we'll be able to reconstruct the proper directory items from backrefs. |
| 3059 | * |
| 3060 | * This optimizations allows us to avoid relogging the entire inode |
| 3061 | * or the entire directory. |
| 3062 | */ |
| 3063 | int btrfs_del_dir_entries_in_log(struct btrfs_trans_handle *trans, |
| 3064 | struct btrfs_root *root, |
| 3065 | const char *name, int name_len, |
| 3066 | struct inode *dir, u64 index) |
| 3067 | { |
| 3068 | struct btrfs_root *log; |
| 3069 | struct btrfs_dir_item *di; |
| 3070 | struct btrfs_path *path; |
| 3071 | int ret; |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3072 | int err = 0; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3073 | int bytes_del = 0; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3074 | u64 dir_ino = btrfs_ino(dir); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3075 | |
Chris Mason | 3a5f1d4 | 2008-09-11 15:53:37 -0400 | [diff] [blame] | 3076 | if (BTRFS_I(dir)->logged_trans < trans->transid) |
| 3077 | return 0; |
| 3078 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3079 | ret = join_running_log_trans(root); |
| 3080 | if (ret) |
| 3081 | return 0; |
| 3082 | |
| 3083 | mutex_lock(&BTRFS_I(dir)->log_mutex); |
| 3084 | |
| 3085 | log = root->log_root; |
| 3086 | path = btrfs_alloc_path(); |
Tsutomu Itoh | a62f44a | 2011-04-25 19:43:51 -0400 | [diff] [blame] | 3087 | if (!path) { |
| 3088 | err = -ENOMEM; |
| 3089 | goto out_unlock; |
| 3090 | } |
liubo | 2a29edc | 2011-01-26 06:22:08 +0000 | [diff] [blame] | 3091 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3092 | di = btrfs_lookup_dir_item(trans, log, path, dir_ino, |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3093 | name, name_len, -1); |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3094 | if (IS_ERR(di)) { |
| 3095 | err = PTR_ERR(di); |
| 3096 | goto fail; |
| 3097 | } |
| 3098 | if (di) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3099 | ret = btrfs_delete_one_dir_name(trans, log, path, di); |
| 3100 | bytes_del += name_len; |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 3101 | if (ret) { |
| 3102 | err = ret; |
| 3103 | goto fail; |
| 3104 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3105 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3106 | btrfs_release_path(path); |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3107 | di = btrfs_lookup_dir_index_item(trans, log, path, dir_ino, |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3108 | index, name, name_len, -1); |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3109 | if (IS_ERR(di)) { |
| 3110 | err = PTR_ERR(di); |
| 3111 | goto fail; |
| 3112 | } |
| 3113 | if (di) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3114 | ret = btrfs_delete_one_dir_name(trans, log, path, di); |
| 3115 | bytes_del += name_len; |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 3116 | if (ret) { |
| 3117 | err = ret; |
| 3118 | goto fail; |
| 3119 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3120 | } |
| 3121 | |
| 3122 | /* update the directory size in the log to reflect the names |
| 3123 | * we have removed |
| 3124 | */ |
| 3125 | if (bytes_del) { |
| 3126 | struct btrfs_key key; |
| 3127 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3128 | key.objectid = dir_ino; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3129 | key.offset = 0; |
| 3130 | key.type = BTRFS_INODE_ITEM_KEY; |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3131 | btrfs_release_path(path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3132 | |
| 3133 | ret = btrfs_search_slot(trans, log, &key, path, 0, 1); |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3134 | if (ret < 0) { |
| 3135 | err = ret; |
| 3136 | goto fail; |
| 3137 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3138 | if (ret == 0) { |
| 3139 | struct btrfs_inode_item *item; |
| 3140 | u64 i_size; |
| 3141 | |
| 3142 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
| 3143 | struct btrfs_inode_item); |
| 3144 | i_size = btrfs_inode_size(path->nodes[0], item); |
| 3145 | if (i_size > bytes_del) |
| 3146 | i_size -= bytes_del; |
| 3147 | else |
| 3148 | i_size = 0; |
| 3149 | btrfs_set_inode_size(path->nodes[0], item, i_size); |
| 3150 | btrfs_mark_buffer_dirty(path->nodes[0]); |
| 3151 | } else |
| 3152 | ret = 0; |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3153 | btrfs_release_path(path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3154 | } |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3155 | fail: |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3156 | btrfs_free_path(path); |
Tsutomu Itoh | a62f44a | 2011-04-25 19:43:51 -0400 | [diff] [blame] | 3157 | out_unlock: |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3158 | mutex_unlock(&BTRFS_I(dir)->log_mutex); |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3159 | if (ret == -ENOSPC) { |
Miao Xie | 995946d | 2014-04-02 19:51:06 +0800 | [diff] [blame] | 3160 | btrfs_set_log_full_commit(root->fs_info, trans); |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3161 | ret = 0; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3162 | } else if (ret < 0) |
Jeff Mahoney | 6664283 | 2016-06-10 18:19:25 -0400 | [diff] [blame] | 3163 | btrfs_abort_transaction(trans, ret); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3164 | |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 3165 | btrfs_end_log_trans(root); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3166 | |
Andi Kleen | 411fc6b | 2010-10-29 15:14:31 -0400 | [diff] [blame] | 3167 | return err; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3168 | } |
| 3169 | |
| 3170 | /* see comments for btrfs_del_dir_entries_in_log */ |
| 3171 | int btrfs_del_inode_ref_in_log(struct btrfs_trans_handle *trans, |
| 3172 | struct btrfs_root *root, |
| 3173 | const char *name, int name_len, |
| 3174 | struct inode *inode, u64 dirid) |
| 3175 | { |
| 3176 | struct btrfs_root *log; |
| 3177 | u64 index; |
| 3178 | int ret; |
| 3179 | |
Chris Mason | 3a5f1d4 | 2008-09-11 15:53:37 -0400 | [diff] [blame] | 3180 | if (BTRFS_I(inode)->logged_trans < trans->transid) |
| 3181 | return 0; |
| 3182 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3183 | ret = join_running_log_trans(root); |
| 3184 | if (ret) |
| 3185 | return 0; |
| 3186 | log = root->log_root; |
| 3187 | mutex_lock(&BTRFS_I(inode)->log_mutex); |
| 3188 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3189 | ret = btrfs_del_inode_ref(trans, log, name, name_len, btrfs_ino(inode), |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3190 | dirid, &index); |
| 3191 | mutex_unlock(&BTRFS_I(inode)->log_mutex); |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3192 | if (ret == -ENOSPC) { |
Miao Xie | 995946d | 2014-04-02 19:51:06 +0800 | [diff] [blame] | 3193 | btrfs_set_log_full_commit(root->fs_info, trans); |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3194 | ret = 0; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3195 | } else if (ret < 0 && ret != -ENOENT) |
Jeff Mahoney | 6664283 | 2016-06-10 18:19:25 -0400 | [diff] [blame] | 3196 | btrfs_abort_transaction(trans, ret); |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 3197 | btrfs_end_log_trans(root); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3198 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3199 | return ret; |
| 3200 | } |
| 3201 | |
| 3202 | /* |
| 3203 | * creates a range item in the log for 'dirid'. first_offset and |
| 3204 | * last_offset tell us which parts of the key space the log should |
| 3205 | * be considered authoritative for. |
| 3206 | */ |
| 3207 | static noinline int insert_dir_log_key(struct btrfs_trans_handle *trans, |
| 3208 | struct btrfs_root *log, |
| 3209 | struct btrfs_path *path, |
| 3210 | int key_type, u64 dirid, |
| 3211 | u64 first_offset, u64 last_offset) |
| 3212 | { |
| 3213 | int ret; |
| 3214 | struct btrfs_key key; |
| 3215 | struct btrfs_dir_log_item *item; |
| 3216 | |
| 3217 | key.objectid = dirid; |
| 3218 | key.offset = first_offset; |
| 3219 | if (key_type == BTRFS_DIR_ITEM_KEY) |
| 3220 | key.type = BTRFS_DIR_LOG_ITEM_KEY; |
| 3221 | else |
| 3222 | key.type = BTRFS_DIR_LOG_INDEX_KEY; |
| 3223 | ret = btrfs_insert_empty_item(trans, log, path, &key, sizeof(*item)); |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3224 | if (ret) |
| 3225 | return ret; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3226 | |
| 3227 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
| 3228 | struct btrfs_dir_log_item); |
| 3229 | btrfs_set_dir_log_end(path->nodes[0], item, last_offset); |
| 3230 | btrfs_mark_buffer_dirty(path->nodes[0]); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3231 | btrfs_release_path(path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3232 | return 0; |
| 3233 | } |
| 3234 | |
| 3235 | /* |
| 3236 | * log all the items included in the current transaction for a given |
| 3237 | * directory. This also creates the range items in the log tree required |
| 3238 | * to replay anything deleted before the fsync |
| 3239 | */ |
| 3240 | static noinline int log_dir_items(struct btrfs_trans_handle *trans, |
| 3241 | struct btrfs_root *root, struct inode *inode, |
| 3242 | struct btrfs_path *path, |
| 3243 | struct btrfs_path *dst_path, int key_type, |
Filipe Manana | 2f2ff0e | 2015-03-20 17:19:46 +0000 | [diff] [blame] | 3244 | struct btrfs_log_ctx *ctx, |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3245 | u64 min_offset, u64 *last_offset_ret) |
| 3246 | { |
| 3247 | struct btrfs_key min_key; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3248 | struct btrfs_root *log = root->log_root; |
| 3249 | struct extent_buffer *src; |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3250 | int err = 0; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3251 | int ret; |
| 3252 | int i; |
| 3253 | int nritems; |
| 3254 | u64 first_offset = min_offset; |
| 3255 | u64 last_offset = (u64)-1; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3256 | u64 ino = btrfs_ino(inode); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3257 | |
| 3258 | log = root->log_root; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3259 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3260 | min_key.objectid = ino; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3261 | min_key.type = key_type; |
| 3262 | min_key.offset = min_offset; |
| 3263 | |
Filipe David Borba Manana | 6174d3c | 2013-10-01 16:13:42 +0100 | [diff] [blame] | 3264 | ret = btrfs_search_forward(root, &min_key, path, trans->transid); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3265 | |
| 3266 | /* |
| 3267 | * we didn't find anything from this transaction, see if there |
| 3268 | * is anything at all |
| 3269 | */ |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3270 | if (ret != 0 || min_key.objectid != ino || min_key.type != key_type) { |
| 3271 | min_key.objectid = ino; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3272 | min_key.type = key_type; |
| 3273 | min_key.offset = (u64)-1; |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3274 | btrfs_release_path(path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3275 | ret = btrfs_search_slot(NULL, root, &min_key, path, 0, 0); |
| 3276 | if (ret < 0) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3277 | btrfs_release_path(path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3278 | return ret; |
| 3279 | } |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3280 | ret = btrfs_previous_item(root, path, ino, key_type); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3281 | |
| 3282 | /* if ret == 0 there are items for this type, |
| 3283 | * create a range to tell us the last key of this type. |
| 3284 | * otherwise, there are no items in this directory after |
| 3285 | * *min_offset, and we create a range to indicate that. |
| 3286 | */ |
| 3287 | if (ret == 0) { |
| 3288 | struct btrfs_key tmp; |
| 3289 | btrfs_item_key_to_cpu(path->nodes[0], &tmp, |
| 3290 | path->slots[0]); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3291 | if (key_type == tmp.type) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3292 | first_offset = max(min_offset, tmp.offset) + 1; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3293 | } |
| 3294 | goto done; |
| 3295 | } |
| 3296 | |
| 3297 | /* go backward to find any previous key */ |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3298 | ret = btrfs_previous_item(root, path, ino, key_type); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3299 | if (ret == 0) { |
| 3300 | struct btrfs_key tmp; |
| 3301 | btrfs_item_key_to_cpu(path->nodes[0], &tmp, path->slots[0]); |
| 3302 | if (key_type == tmp.type) { |
| 3303 | first_offset = tmp.offset; |
| 3304 | ret = overwrite_item(trans, log, dst_path, |
| 3305 | path->nodes[0], path->slots[0], |
| 3306 | &tmp); |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3307 | if (ret) { |
| 3308 | err = ret; |
| 3309 | goto done; |
| 3310 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3311 | } |
| 3312 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3313 | btrfs_release_path(path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3314 | |
| 3315 | /* find the first key from this transaction again */ |
| 3316 | ret = btrfs_search_slot(NULL, root, &min_key, path, 0, 0); |
Dulshani Gunawardhana | fae7f21 | 2013-10-31 10:30:08 +0530 | [diff] [blame] | 3317 | if (WARN_ON(ret != 0)) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3318 | goto done; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3319 | |
| 3320 | /* |
| 3321 | * we have a block from this transaction, log every item in it |
| 3322 | * from our directory |
| 3323 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3324 | while (1) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3325 | struct btrfs_key tmp; |
| 3326 | src = path->nodes[0]; |
| 3327 | nritems = btrfs_header_nritems(src); |
| 3328 | for (i = path->slots[0]; i < nritems; i++) { |
Filipe Manana | 2f2ff0e | 2015-03-20 17:19:46 +0000 | [diff] [blame] | 3329 | struct btrfs_dir_item *di; |
| 3330 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3331 | btrfs_item_key_to_cpu(src, &min_key, i); |
| 3332 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3333 | if (min_key.objectid != ino || min_key.type != key_type) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3334 | goto done; |
| 3335 | ret = overwrite_item(trans, log, dst_path, src, i, |
| 3336 | &min_key); |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3337 | if (ret) { |
| 3338 | err = ret; |
| 3339 | goto done; |
| 3340 | } |
Filipe Manana | 2f2ff0e | 2015-03-20 17:19:46 +0000 | [diff] [blame] | 3341 | |
| 3342 | /* |
| 3343 | * We must make sure that when we log a directory entry, |
| 3344 | * the corresponding inode, after log replay, has a |
| 3345 | * matching link count. For example: |
| 3346 | * |
| 3347 | * touch foo |
| 3348 | * mkdir mydir |
| 3349 | * sync |
| 3350 | * ln foo mydir/bar |
| 3351 | * xfs_io -c "fsync" mydir |
| 3352 | * <crash> |
| 3353 | * <mount fs and log replay> |
| 3354 | * |
| 3355 | * Would result in a fsync log that when replayed, our |
| 3356 | * file inode would have a link count of 1, but we get |
| 3357 | * two directory entries pointing to the same inode. |
| 3358 | * After removing one of the names, it would not be |
| 3359 | * possible to remove the other name, which resulted |
| 3360 | * always in stale file handle errors, and would not |
| 3361 | * be possible to rmdir the parent directory, since |
| 3362 | * its i_size could never decrement to the value |
| 3363 | * BTRFS_EMPTY_DIR_SIZE, resulting in -ENOTEMPTY errors. |
| 3364 | */ |
| 3365 | di = btrfs_item_ptr(src, i, struct btrfs_dir_item); |
| 3366 | btrfs_dir_item_key_to_cpu(src, di, &tmp); |
| 3367 | if (ctx && |
| 3368 | (btrfs_dir_transid(src, di) == trans->transid || |
| 3369 | btrfs_dir_type(src, di) == BTRFS_FT_DIR) && |
| 3370 | tmp.type != BTRFS_ROOT_ITEM_KEY) |
| 3371 | ctx->log_new_dentries = true; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3372 | } |
| 3373 | path->slots[0] = nritems; |
| 3374 | |
| 3375 | /* |
| 3376 | * look ahead to the next item and see if it is also |
| 3377 | * from this directory and from this transaction |
| 3378 | */ |
| 3379 | ret = btrfs_next_leaf(root, path); |
| 3380 | if (ret == 1) { |
| 3381 | last_offset = (u64)-1; |
| 3382 | goto done; |
| 3383 | } |
| 3384 | btrfs_item_key_to_cpu(path->nodes[0], &tmp, path->slots[0]); |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3385 | if (tmp.objectid != ino || tmp.type != key_type) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3386 | last_offset = (u64)-1; |
| 3387 | goto done; |
| 3388 | } |
| 3389 | if (btrfs_header_generation(path->nodes[0]) != trans->transid) { |
| 3390 | ret = overwrite_item(trans, log, dst_path, |
| 3391 | path->nodes[0], path->slots[0], |
| 3392 | &tmp); |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3393 | if (ret) |
| 3394 | err = ret; |
| 3395 | else |
| 3396 | last_offset = tmp.offset; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3397 | goto done; |
| 3398 | } |
| 3399 | } |
| 3400 | done: |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3401 | btrfs_release_path(path); |
| 3402 | btrfs_release_path(dst_path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3403 | |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3404 | if (err == 0) { |
| 3405 | *last_offset_ret = last_offset; |
| 3406 | /* |
| 3407 | * insert the log range keys to indicate where the log |
| 3408 | * is valid |
| 3409 | */ |
| 3410 | ret = insert_dir_log_key(trans, log, path, key_type, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3411 | ino, first_offset, last_offset); |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3412 | if (ret) |
| 3413 | err = ret; |
| 3414 | } |
| 3415 | return err; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3416 | } |
| 3417 | |
| 3418 | /* |
| 3419 | * logging directories is very similar to logging inodes, We find all the items |
| 3420 | * from the current transaction and write them to the log. |
| 3421 | * |
| 3422 | * The recovery code scans the directory in the subvolume, and if it finds a |
| 3423 | * key in the range logged that is not present in the log tree, then it means |
| 3424 | * that dir entry was unlinked during the transaction. |
| 3425 | * |
| 3426 | * In order for that scan to work, we must include one key smaller than |
| 3427 | * the smallest logged by this transaction and one key larger than the largest |
| 3428 | * key logged by this transaction. |
| 3429 | */ |
| 3430 | static noinline int log_directory_changes(struct btrfs_trans_handle *trans, |
| 3431 | struct btrfs_root *root, struct inode *inode, |
| 3432 | struct btrfs_path *path, |
Filipe Manana | 2f2ff0e | 2015-03-20 17:19:46 +0000 | [diff] [blame] | 3433 | struct btrfs_path *dst_path, |
| 3434 | struct btrfs_log_ctx *ctx) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3435 | { |
| 3436 | u64 min_key; |
| 3437 | u64 max_key; |
| 3438 | int ret; |
| 3439 | int key_type = BTRFS_DIR_ITEM_KEY; |
| 3440 | |
| 3441 | again: |
| 3442 | min_key = 0; |
| 3443 | max_key = 0; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3444 | while (1) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3445 | ret = log_dir_items(trans, root, inode, path, |
Filipe Manana | 2f2ff0e | 2015-03-20 17:19:46 +0000 | [diff] [blame] | 3446 | dst_path, key_type, ctx, min_key, |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3447 | &max_key); |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3448 | if (ret) |
| 3449 | return ret; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3450 | if (max_key == (u64)-1) |
| 3451 | break; |
| 3452 | min_key = max_key + 1; |
| 3453 | } |
| 3454 | |
| 3455 | if (key_type == BTRFS_DIR_ITEM_KEY) { |
| 3456 | key_type = BTRFS_DIR_INDEX_KEY; |
| 3457 | goto again; |
| 3458 | } |
| 3459 | return 0; |
| 3460 | } |
| 3461 | |
| 3462 | /* |
| 3463 | * a helper function to drop items from the log before we relog an |
| 3464 | * inode. max_key_type indicates the highest item type to remove. |
| 3465 | * This cannot be run for file data extents because it does not |
| 3466 | * free the extents they point to. |
| 3467 | */ |
| 3468 | static int drop_objectid_items(struct btrfs_trans_handle *trans, |
| 3469 | struct btrfs_root *log, |
| 3470 | struct btrfs_path *path, |
| 3471 | u64 objectid, int max_key_type) |
| 3472 | { |
| 3473 | int ret; |
| 3474 | struct btrfs_key key; |
| 3475 | struct btrfs_key found_key; |
Josef Bacik | 18ec90d | 2012-09-28 11:56:28 -0400 | [diff] [blame] | 3476 | int start_slot; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3477 | |
| 3478 | key.objectid = objectid; |
| 3479 | key.type = max_key_type; |
| 3480 | key.offset = (u64)-1; |
| 3481 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3482 | while (1) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3483 | ret = btrfs_search_slot(trans, log, &key, path, -1, 1); |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 3484 | BUG_ON(ret == 0); /* Logic error */ |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3485 | if (ret < 0) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3486 | break; |
| 3487 | |
| 3488 | if (path->slots[0] == 0) |
| 3489 | break; |
| 3490 | |
| 3491 | path->slots[0]--; |
| 3492 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, |
| 3493 | path->slots[0]); |
| 3494 | |
| 3495 | if (found_key.objectid != objectid) |
| 3496 | break; |
| 3497 | |
Josef Bacik | 18ec90d | 2012-09-28 11:56:28 -0400 | [diff] [blame] | 3498 | found_key.offset = 0; |
| 3499 | found_key.type = 0; |
| 3500 | ret = btrfs_bin_search(path->nodes[0], &found_key, 0, |
| 3501 | &start_slot); |
| 3502 | |
| 3503 | ret = btrfs_del_items(trans, log, path, start_slot, |
| 3504 | path->slots[0] - start_slot + 1); |
| 3505 | /* |
| 3506 | * If start slot isn't 0 then we don't need to re-search, we've |
| 3507 | * found the last guy with the objectid in this tree. |
| 3508 | */ |
| 3509 | if (ret || start_slot != 0) |
Tsutomu Itoh | 65a246c | 2011-05-19 04:37:44 +0000 | [diff] [blame] | 3510 | break; |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3511 | btrfs_release_path(path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3512 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3513 | btrfs_release_path(path); |
Josef Bacik | 5bdbeb2 | 2012-05-29 16:59:49 -0400 | [diff] [blame] | 3514 | if (ret > 0) |
| 3515 | ret = 0; |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3516 | return ret; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3517 | } |
| 3518 | |
Josef Bacik | 94edf4a | 2012-09-25 14:56:25 -0400 | [diff] [blame] | 3519 | static void fill_inode_item(struct btrfs_trans_handle *trans, |
| 3520 | struct extent_buffer *leaf, |
| 3521 | struct btrfs_inode_item *item, |
Filipe Manana | 1a4bcf4 | 2015-02-13 12:30:56 +0000 | [diff] [blame] | 3522 | struct inode *inode, int log_inode_only, |
| 3523 | u64 logged_isize) |
Josef Bacik | 94edf4a | 2012-09-25 14:56:25 -0400 | [diff] [blame] | 3524 | { |
Josef Bacik | 0b1c6cc | 2012-10-23 16:03:44 -0400 | [diff] [blame] | 3525 | struct btrfs_map_token token; |
Josef Bacik | 94edf4a | 2012-09-25 14:56:25 -0400 | [diff] [blame] | 3526 | |
Josef Bacik | 0b1c6cc | 2012-10-23 16:03:44 -0400 | [diff] [blame] | 3527 | btrfs_init_map_token(&token); |
Josef Bacik | 94edf4a | 2012-09-25 14:56:25 -0400 | [diff] [blame] | 3528 | |
| 3529 | if (log_inode_only) { |
| 3530 | /* set the generation to zero so the recover code |
| 3531 | * can tell the difference between an logging |
| 3532 | * just to say 'this inode exists' and a logging |
| 3533 | * to say 'update this inode with these values' |
| 3534 | */ |
Josef Bacik | 0b1c6cc | 2012-10-23 16:03:44 -0400 | [diff] [blame] | 3535 | btrfs_set_token_inode_generation(leaf, item, 0, &token); |
Filipe Manana | 1a4bcf4 | 2015-02-13 12:30:56 +0000 | [diff] [blame] | 3536 | btrfs_set_token_inode_size(leaf, item, logged_isize, &token); |
Josef Bacik | 94edf4a | 2012-09-25 14:56:25 -0400 | [diff] [blame] | 3537 | } else { |
Josef Bacik | 0b1c6cc | 2012-10-23 16:03:44 -0400 | [diff] [blame] | 3538 | btrfs_set_token_inode_generation(leaf, item, |
| 3539 | BTRFS_I(inode)->generation, |
| 3540 | &token); |
| 3541 | btrfs_set_token_inode_size(leaf, item, inode->i_size, &token); |
Josef Bacik | 94edf4a | 2012-09-25 14:56:25 -0400 | [diff] [blame] | 3542 | } |
| 3543 | |
Josef Bacik | 0b1c6cc | 2012-10-23 16:03:44 -0400 | [diff] [blame] | 3544 | btrfs_set_token_inode_uid(leaf, item, i_uid_read(inode), &token); |
| 3545 | btrfs_set_token_inode_gid(leaf, item, i_gid_read(inode), &token); |
| 3546 | btrfs_set_token_inode_mode(leaf, item, inode->i_mode, &token); |
| 3547 | btrfs_set_token_inode_nlink(leaf, item, inode->i_nlink, &token); |
| 3548 | |
David Sterba | a937b97 | 2014-12-12 17:39:12 +0100 | [diff] [blame] | 3549 | btrfs_set_token_timespec_sec(leaf, &item->atime, |
Josef Bacik | 0b1c6cc | 2012-10-23 16:03:44 -0400 | [diff] [blame] | 3550 | inode->i_atime.tv_sec, &token); |
David Sterba | a937b97 | 2014-12-12 17:39:12 +0100 | [diff] [blame] | 3551 | btrfs_set_token_timespec_nsec(leaf, &item->atime, |
Josef Bacik | 0b1c6cc | 2012-10-23 16:03:44 -0400 | [diff] [blame] | 3552 | inode->i_atime.tv_nsec, &token); |
| 3553 | |
David Sterba | a937b97 | 2014-12-12 17:39:12 +0100 | [diff] [blame] | 3554 | btrfs_set_token_timespec_sec(leaf, &item->mtime, |
Josef Bacik | 0b1c6cc | 2012-10-23 16:03:44 -0400 | [diff] [blame] | 3555 | inode->i_mtime.tv_sec, &token); |
David Sterba | a937b97 | 2014-12-12 17:39:12 +0100 | [diff] [blame] | 3556 | btrfs_set_token_timespec_nsec(leaf, &item->mtime, |
Josef Bacik | 0b1c6cc | 2012-10-23 16:03:44 -0400 | [diff] [blame] | 3557 | inode->i_mtime.tv_nsec, &token); |
| 3558 | |
David Sterba | a937b97 | 2014-12-12 17:39:12 +0100 | [diff] [blame] | 3559 | btrfs_set_token_timespec_sec(leaf, &item->ctime, |
Josef Bacik | 0b1c6cc | 2012-10-23 16:03:44 -0400 | [diff] [blame] | 3560 | inode->i_ctime.tv_sec, &token); |
David Sterba | a937b97 | 2014-12-12 17:39:12 +0100 | [diff] [blame] | 3561 | btrfs_set_token_timespec_nsec(leaf, &item->ctime, |
Josef Bacik | 0b1c6cc | 2012-10-23 16:03:44 -0400 | [diff] [blame] | 3562 | inode->i_ctime.tv_nsec, &token); |
| 3563 | |
| 3564 | btrfs_set_token_inode_nbytes(leaf, item, inode_get_bytes(inode), |
| 3565 | &token); |
| 3566 | |
| 3567 | btrfs_set_token_inode_sequence(leaf, item, inode->i_version, &token); |
| 3568 | btrfs_set_token_inode_transid(leaf, item, trans->transid, &token); |
| 3569 | btrfs_set_token_inode_rdev(leaf, item, inode->i_rdev, &token); |
| 3570 | btrfs_set_token_inode_flags(leaf, item, BTRFS_I(inode)->flags, &token); |
| 3571 | btrfs_set_token_inode_block_group(leaf, item, 0, &token); |
Josef Bacik | 94edf4a | 2012-09-25 14:56:25 -0400 | [diff] [blame] | 3572 | } |
| 3573 | |
Josef Bacik | a95249b | 2012-10-11 16:17:34 -0400 | [diff] [blame] | 3574 | static int log_inode_item(struct btrfs_trans_handle *trans, |
| 3575 | struct btrfs_root *log, struct btrfs_path *path, |
| 3576 | struct inode *inode) |
| 3577 | { |
| 3578 | struct btrfs_inode_item *inode_item; |
Josef Bacik | a95249b | 2012-10-11 16:17:34 -0400 | [diff] [blame] | 3579 | int ret; |
| 3580 | |
Filipe David Borba Manana | efd0c40 | 2013-10-07 21:20:44 +0100 | [diff] [blame] | 3581 | ret = btrfs_insert_empty_item(trans, log, path, |
| 3582 | &BTRFS_I(inode)->location, |
Josef Bacik | a95249b | 2012-10-11 16:17:34 -0400 | [diff] [blame] | 3583 | sizeof(*inode_item)); |
| 3584 | if (ret && ret != -EEXIST) |
| 3585 | return ret; |
| 3586 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
| 3587 | struct btrfs_inode_item); |
Filipe Manana | 1a4bcf4 | 2015-02-13 12:30:56 +0000 | [diff] [blame] | 3588 | fill_inode_item(trans, path->nodes[0], inode_item, inode, 0, 0); |
Josef Bacik | a95249b | 2012-10-11 16:17:34 -0400 | [diff] [blame] | 3589 | btrfs_release_path(path); |
| 3590 | return 0; |
| 3591 | } |
| 3592 | |
Chris Mason | 31ff1cd | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 3593 | static noinline int copy_items(struct btrfs_trans_handle *trans, |
Liu Bo | d279440 | 2012-08-29 01:07:56 -0600 | [diff] [blame] | 3594 | struct inode *inode, |
Chris Mason | 31ff1cd | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 3595 | struct btrfs_path *dst_path, |
Josef Bacik | 16e7549 | 2013-10-22 12:18:51 -0400 | [diff] [blame] | 3596 | struct btrfs_path *src_path, u64 *last_extent, |
Filipe Manana | 1a4bcf4 | 2015-02-13 12:30:56 +0000 | [diff] [blame] | 3597 | int start_slot, int nr, int inode_only, |
| 3598 | u64 logged_isize) |
Chris Mason | 31ff1cd | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 3599 | { |
| 3600 | unsigned long src_offset; |
| 3601 | unsigned long dst_offset; |
Liu Bo | d279440 | 2012-08-29 01:07:56 -0600 | [diff] [blame] | 3602 | struct btrfs_root *log = BTRFS_I(inode)->root->log_root; |
Chris Mason | 31ff1cd | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 3603 | struct btrfs_file_extent_item *extent; |
| 3604 | struct btrfs_inode_item *inode_item; |
Josef Bacik | 16e7549 | 2013-10-22 12:18:51 -0400 | [diff] [blame] | 3605 | struct extent_buffer *src = src_path->nodes[0]; |
| 3606 | struct btrfs_key first_key, last_key, key; |
Chris Mason | 31ff1cd | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 3607 | int ret; |
| 3608 | struct btrfs_key *ins_keys; |
| 3609 | u32 *ins_sizes; |
| 3610 | char *ins_data; |
| 3611 | int i; |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 3612 | struct list_head ordered_sums; |
Liu Bo | d279440 | 2012-08-29 01:07:56 -0600 | [diff] [blame] | 3613 | int skip_csum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM; |
Josef Bacik | 16e7549 | 2013-10-22 12:18:51 -0400 | [diff] [blame] | 3614 | bool has_extents = false; |
Filipe Manana | 74121f7 | 2014-08-07 12:00:44 +0100 | [diff] [blame] | 3615 | bool need_find_last_extent = true; |
Josef Bacik | 16e7549 | 2013-10-22 12:18:51 -0400 | [diff] [blame] | 3616 | bool done = false; |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 3617 | |
| 3618 | INIT_LIST_HEAD(&ordered_sums); |
Chris Mason | 31ff1cd | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 3619 | |
| 3620 | ins_data = kmalloc(nr * sizeof(struct btrfs_key) + |
| 3621 | nr * sizeof(u32), GFP_NOFS); |
liubo | 2a29edc | 2011-01-26 06:22:08 +0000 | [diff] [blame] | 3622 | if (!ins_data) |
| 3623 | return -ENOMEM; |
| 3624 | |
Josef Bacik | 16e7549 | 2013-10-22 12:18:51 -0400 | [diff] [blame] | 3625 | first_key.objectid = (u64)-1; |
| 3626 | |
Chris Mason | 31ff1cd | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 3627 | ins_sizes = (u32 *)ins_data; |
| 3628 | ins_keys = (struct btrfs_key *)(ins_data + nr * sizeof(u32)); |
| 3629 | |
| 3630 | for (i = 0; i < nr; i++) { |
| 3631 | ins_sizes[i] = btrfs_item_size_nr(src, i + start_slot); |
| 3632 | btrfs_item_key_to_cpu(src, ins_keys + i, i + start_slot); |
| 3633 | } |
| 3634 | ret = btrfs_insert_empty_items(trans, log, dst_path, |
| 3635 | ins_keys, ins_sizes, nr); |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3636 | if (ret) { |
| 3637 | kfree(ins_data); |
| 3638 | return ret; |
| 3639 | } |
Chris Mason | 31ff1cd | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 3640 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3641 | for (i = 0; i < nr; i++, dst_path->slots[0]++) { |
Chris Mason | 31ff1cd | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 3642 | dst_offset = btrfs_item_ptr_offset(dst_path->nodes[0], |
| 3643 | dst_path->slots[0]); |
| 3644 | |
| 3645 | src_offset = btrfs_item_ptr_offset(src, start_slot + i); |
| 3646 | |
Josef Bacik | 16e7549 | 2013-10-22 12:18:51 -0400 | [diff] [blame] | 3647 | if ((i == (nr - 1))) |
| 3648 | last_key = ins_keys[i]; |
| 3649 | |
Josef Bacik | 94edf4a | 2012-09-25 14:56:25 -0400 | [diff] [blame] | 3650 | if (ins_keys[i].type == BTRFS_INODE_ITEM_KEY) { |
Chris Mason | 31ff1cd | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 3651 | inode_item = btrfs_item_ptr(dst_path->nodes[0], |
| 3652 | dst_path->slots[0], |
| 3653 | struct btrfs_inode_item); |
Josef Bacik | 94edf4a | 2012-09-25 14:56:25 -0400 | [diff] [blame] | 3654 | fill_inode_item(trans, dst_path->nodes[0], inode_item, |
Filipe Manana | 1a4bcf4 | 2015-02-13 12:30:56 +0000 | [diff] [blame] | 3655 | inode, inode_only == LOG_INODE_EXISTS, |
| 3656 | logged_isize); |
Josef Bacik | 94edf4a | 2012-09-25 14:56:25 -0400 | [diff] [blame] | 3657 | } else { |
| 3658 | copy_extent_buffer(dst_path->nodes[0], src, dst_offset, |
| 3659 | src_offset, ins_sizes[i]); |
Chris Mason | 31ff1cd | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 3660 | } |
Josef Bacik | 94edf4a | 2012-09-25 14:56:25 -0400 | [diff] [blame] | 3661 | |
Josef Bacik | 16e7549 | 2013-10-22 12:18:51 -0400 | [diff] [blame] | 3662 | /* |
| 3663 | * We set need_find_last_extent here in case we know we were |
| 3664 | * processing other items and then walk into the first extent in |
| 3665 | * the inode. If we don't hit an extent then nothing changes, |
| 3666 | * we'll do the last search the next time around. |
| 3667 | */ |
| 3668 | if (ins_keys[i].type == BTRFS_EXTENT_DATA_KEY) { |
| 3669 | has_extents = true; |
Filipe Manana | 74121f7 | 2014-08-07 12:00:44 +0100 | [diff] [blame] | 3670 | if (first_key.objectid == (u64)-1) |
Josef Bacik | 16e7549 | 2013-10-22 12:18:51 -0400 | [diff] [blame] | 3671 | first_key = ins_keys[i]; |
| 3672 | } else { |
| 3673 | need_find_last_extent = false; |
| 3674 | } |
| 3675 | |
Chris Mason | 31ff1cd | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 3676 | /* take a reference on file data extents so that truncates |
| 3677 | * or deletes of this inode don't have to relog the inode |
| 3678 | * again |
| 3679 | */ |
David Sterba | 962a298 | 2014-06-04 18:41:45 +0200 | [diff] [blame] | 3680 | if (ins_keys[i].type == BTRFS_EXTENT_DATA_KEY && |
Liu Bo | d279440 | 2012-08-29 01:07:56 -0600 | [diff] [blame] | 3681 | !skip_csum) { |
Chris Mason | 31ff1cd | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 3682 | int found_type; |
| 3683 | extent = btrfs_item_ptr(src, start_slot + i, |
| 3684 | struct btrfs_file_extent_item); |
| 3685 | |
liubo | 8e531cd | 2011-05-06 10:36:09 +0800 | [diff] [blame] | 3686 | if (btrfs_file_extent_generation(src, extent) < trans->transid) |
| 3687 | continue; |
| 3688 | |
Chris Mason | 31ff1cd | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 3689 | found_type = btrfs_file_extent_type(src, extent); |
Josef Bacik | 6f1fed7 | 2012-09-26 11:07:06 -0400 | [diff] [blame] | 3690 | if (found_type == BTRFS_FILE_EXTENT_REG) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3691 | u64 ds, dl, cs, cl; |
| 3692 | ds = btrfs_file_extent_disk_bytenr(src, |
| 3693 | extent); |
| 3694 | /* ds == 0 is a hole */ |
| 3695 | if (ds == 0) |
| 3696 | continue; |
| 3697 | |
| 3698 | dl = btrfs_file_extent_disk_num_bytes(src, |
| 3699 | extent); |
| 3700 | cs = btrfs_file_extent_offset(src, extent); |
| 3701 | cl = btrfs_file_extent_num_bytes(src, |
Joe Perches | a419aef | 2009-08-18 11:18:35 -0700 | [diff] [blame] | 3702 | extent); |
Chris Mason | 580afd7 | 2008-12-08 19:15:39 -0500 | [diff] [blame] | 3703 | if (btrfs_file_extent_compression(src, |
| 3704 | extent)) { |
| 3705 | cs = 0; |
| 3706 | cl = dl; |
| 3707 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3708 | |
| 3709 | ret = btrfs_lookup_csums_range( |
| 3710 | log->fs_info->csum_root, |
| 3711 | ds + cs, ds + cs + cl - 1, |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 3712 | &ordered_sums, 0); |
Josef Bacik | 3650860 | 2013-04-25 16:23:32 -0400 | [diff] [blame] | 3713 | if (ret) { |
| 3714 | btrfs_release_path(dst_path); |
| 3715 | kfree(ins_data); |
| 3716 | return ret; |
| 3717 | } |
Chris Mason | 31ff1cd | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 3718 | } |
| 3719 | } |
Chris Mason | 31ff1cd | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 3720 | } |
| 3721 | |
| 3722 | btrfs_mark_buffer_dirty(dst_path->nodes[0]); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3723 | btrfs_release_path(dst_path); |
Chris Mason | 31ff1cd | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 3724 | kfree(ins_data); |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 3725 | |
| 3726 | /* |
| 3727 | * we have to do this after the loop above to avoid changing the |
| 3728 | * log tree while trying to change the log tree. |
| 3729 | */ |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3730 | ret = 0; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3731 | while (!list_empty(&ordered_sums)) { |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 3732 | struct btrfs_ordered_sum *sums = list_entry(ordered_sums.next, |
| 3733 | struct btrfs_ordered_sum, |
| 3734 | list); |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3735 | if (!ret) |
| 3736 | ret = btrfs_csum_file_blocks(trans, log, sums); |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 3737 | list_del(&sums->list); |
| 3738 | kfree(sums); |
| 3739 | } |
Josef Bacik | 16e7549 | 2013-10-22 12:18:51 -0400 | [diff] [blame] | 3740 | |
| 3741 | if (!has_extents) |
| 3742 | return ret; |
| 3743 | |
Filipe Manana | 74121f7 | 2014-08-07 12:00:44 +0100 | [diff] [blame] | 3744 | if (need_find_last_extent && *last_extent == first_key.offset) { |
| 3745 | /* |
| 3746 | * We don't have any leafs between our current one and the one |
| 3747 | * we processed before that can have file extent items for our |
| 3748 | * inode (and have a generation number smaller than our current |
| 3749 | * transaction id). |
| 3750 | */ |
| 3751 | need_find_last_extent = false; |
| 3752 | } |
| 3753 | |
Josef Bacik | 16e7549 | 2013-10-22 12:18:51 -0400 | [diff] [blame] | 3754 | /* |
| 3755 | * Because we use btrfs_search_forward we could skip leaves that were |
| 3756 | * not modified and then assume *last_extent is valid when it really |
| 3757 | * isn't. So back up to the previous leaf and read the end of the last |
| 3758 | * extent before we go and fill in holes. |
| 3759 | */ |
| 3760 | if (need_find_last_extent) { |
| 3761 | u64 len; |
| 3762 | |
| 3763 | ret = btrfs_prev_leaf(BTRFS_I(inode)->root, src_path); |
| 3764 | if (ret < 0) |
| 3765 | return ret; |
| 3766 | if (ret) |
| 3767 | goto fill_holes; |
| 3768 | if (src_path->slots[0]) |
| 3769 | src_path->slots[0]--; |
| 3770 | src = src_path->nodes[0]; |
| 3771 | btrfs_item_key_to_cpu(src, &key, src_path->slots[0]); |
| 3772 | if (key.objectid != btrfs_ino(inode) || |
| 3773 | key.type != BTRFS_EXTENT_DATA_KEY) |
| 3774 | goto fill_holes; |
| 3775 | extent = btrfs_item_ptr(src, src_path->slots[0], |
| 3776 | struct btrfs_file_extent_item); |
| 3777 | if (btrfs_file_extent_type(src, extent) == |
| 3778 | BTRFS_FILE_EXTENT_INLINE) { |
Chris Mason | 514ac8a | 2014-01-03 21:07:00 -0800 | [diff] [blame] | 3779 | len = btrfs_file_extent_inline_len(src, |
| 3780 | src_path->slots[0], |
| 3781 | extent); |
Josef Bacik | 16e7549 | 2013-10-22 12:18:51 -0400 | [diff] [blame] | 3782 | *last_extent = ALIGN(key.offset + len, |
| 3783 | log->sectorsize); |
| 3784 | } else { |
| 3785 | len = btrfs_file_extent_num_bytes(src, extent); |
| 3786 | *last_extent = key.offset + len; |
| 3787 | } |
| 3788 | } |
| 3789 | fill_holes: |
| 3790 | /* So we did prev_leaf, now we need to move to the next leaf, but a few |
| 3791 | * things could have happened |
| 3792 | * |
| 3793 | * 1) A merge could have happened, so we could currently be on a leaf |
| 3794 | * that holds what we were copying in the first place. |
| 3795 | * 2) A split could have happened, and now not all of the items we want |
| 3796 | * are on the same leaf. |
| 3797 | * |
| 3798 | * So we need to adjust how we search for holes, we need to drop the |
| 3799 | * path and re-search for the first extent key we found, and then walk |
| 3800 | * forward until we hit the last one we copied. |
| 3801 | */ |
| 3802 | if (need_find_last_extent) { |
| 3803 | /* btrfs_prev_leaf could return 1 without releasing the path */ |
| 3804 | btrfs_release_path(src_path); |
| 3805 | ret = btrfs_search_slot(NULL, BTRFS_I(inode)->root, &first_key, |
| 3806 | src_path, 0, 0); |
| 3807 | if (ret < 0) |
| 3808 | return ret; |
| 3809 | ASSERT(ret == 0); |
| 3810 | src = src_path->nodes[0]; |
| 3811 | i = src_path->slots[0]; |
| 3812 | } else { |
| 3813 | i = start_slot; |
| 3814 | } |
| 3815 | |
| 3816 | /* |
| 3817 | * Ok so here we need to go through and fill in any holes we may have |
| 3818 | * to make sure that holes are punched for those areas in case they had |
| 3819 | * extents previously. |
| 3820 | */ |
| 3821 | while (!done) { |
| 3822 | u64 offset, len; |
| 3823 | u64 extent_end; |
| 3824 | |
| 3825 | if (i >= btrfs_header_nritems(src_path->nodes[0])) { |
| 3826 | ret = btrfs_next_leaf(BTRFS_I(inode)->root, src_path); |
| 3827 | if (ret < 0) |
| 3828 | return ret; |
| 3829 | ASSERT(ret == 0); |
| 3830 | src = src_path->nodes[0]; |
| 3831 | i = 0; |
| 3832 | } |
| 3833 | |
| 3834 | btrfs_item_key_to_cpu(src, &key, i); |
| 3835 | if (!btrfs_comp_cpu_keys(&key, &last_key)) |
| 3836 | done = true; |
| 3837 | if (key.objectid != btrfs_ino(inode) || |
| 3838 | key.type != BTRFS_EXTENT_DATA_KEY) { |
| 3839 | i++; |
| 3840 | continue; |
| 3841 | } |
| 3842 | extent = btrfs_item_ptr(src, i, struct btrfs_file_extent_item); |
| 3843 | if (btrfs_file_extent_type(src, extent) == |
| 3844 | BTRFS_FILE_EXTENT_INLINE) { |
Chris Mason | 514ac8a | 2014-01-03 21:07:00 -0800 | [diff] [blame] | 3845 | len = btrfs_file_extent_inline_len(src, i, extent); |
Josef Bacik | 16e7549 | 2013-10-22 12:18:51 -0400 | [diff] [blame] | 3846 | extent_end = ALIGN(key.offset + len, log->sectorsize); |
| 3847 | } else { |
| 3848 | len = btrfs_file_extent_num_bytes(src, extent); |
| 3849 | extent_end = key.offset + len; |
| 3850 | } |
| 3851 | i++; |
| 3852 | |
| 3853 | if (*last_extent == key.offset) { |
| 3854 | *last_extent = extent_end; |
| 3855 | continue; |
| 3856 | } |
| 3857 | offset = *last_extent; |
| 3858 | len = key.offset - *last_extent; |
| 3859 | ret = btrfs_insert_file_extent(trans, log, btrfs_ino(inode), |
| 3860 | offset, 0, 0, len, 0, len, 0, |
| 3861 | 0, 0); |
| 3862 | if (ret) |
| 3863 | break; |
Filipe Manana | 74121f7 | 2014-08-07 12:00:44 +0100 | [diff] [blame] | 3864 | *last_extent = extent_end; |
Josef Bacik | 16e7549 | 2013-10-22 12:18:51 -0400 | [diff] [blame] | 3865 | } |
| 3866 | /* |
| 3867 | * Need to let the callers know we dropped the path so they should |
| 3868 | * re-search. |
| 3869 | */ |
| 3870 | if (!ret && need_find_last_extent) |
| 3871 | ret = 1; |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 3872 | return ret; |
Chris Mason | 31ff1cd | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 3873 | } |
| 3874 | |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 3875 | static int extent_cmp(void *priv, struct list_head *a, struct list_head *b) |
| 3876 | { |
| 3877 | struct extent_map *em1, *em2; |
| 3878 | |
| 3879 | em1 = list_entry(a, struct extent_map, list); |
| 3880 | em2 = list_entry(b, struct extent_map, list); |
| 3881 | |
| 3882 | if (em1->start < em2->start) |
| 3883 | return -1; |
| 3884 | else if (em1->start > em2->start) |
| 3885 | return 1; |
| 3886 | return 0; |
| 3887 | } |
| 3888 | |
Filipe Manana | 8407f55 | 2014-09-05 15:14:39 +0100 | [diff] [blame] | 3889 | static int wait_ordered_extents(struct btrfs_trans_handle *trans, |
| 3890 | struct inode *inode, |
| 3891 | struct btrfs_root *root, |
| 3892 | const struct extent_map *em, |
| 3893 | const struct list_head *logged_list, |
| 3894 | bool *ordered_io_error) |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 3895 | { |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 3896 | struct btrfs_ordered_extent *ordered; |
Filipe Manana | 8407f55 | 2014-09-05 15:14:39 +0100 | [diff] [blame] | 3897 | struct btrfs_root *log = root->log_root; |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 3898 | u64 mod_start = em->mod_start; |
| 3899 | u64 mod_len = em->mod_len; |
Filipe Manana | 8407f55 | 2014-09-05 15:14:39 +0100 | [diff] [blame] | 3900 | const bool skip_csum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM; |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 3901 | u64 csum_offset; |
| 3902 | u64 csum_len; |
Filipe Manana | 8407f55 | 2014-09-05 15:14:39 +0100 | [diff] [blame] | 3903 | LIST_HEAD(ordered_sums); |
| 3904 | int ret = 0; |
Josef Bacik | 09a2a8f9 | 2013-04-05 16:51:15 -0400 | [diff] [blame] | 3905 | |
Filipe Manana | 8407f55 | 2014-09-05 15:14:39 +0100 | [diff] [blame] | 3906 | *ordered_io_error = false; |
Josef Bacik | 70c8a91 | 2012-10-11 16:54:30 -0400 | [diff] [blame] | 3907 | |
Filipe Manana | 8407f55 | 2014-09-05 15:14:39 +0100 | [diff] [blame] | 3908 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags) || |
| 3909 | em->block_start == EXTENT_MAP_HOLE) |
Josef Bacik | 70c8a91 | 2012-10-11 16:54:30 -0400 | [diff] [blame] | 3910 | return 0; |
| 3911 | |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 3912 | /* |
Filipe Manana | 8407f55 | 2014-09-05 15:14:39 +0100 | [diff] [blame] | 3913 | * Wait far any ordered extent that covers our extent map. If it |
| 3914 | * finishes without an error, first check and see if our csums are on |
| 3915 | * our outstanding ordered extents. |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 3916 | */ |
Miao Xie | 827463c | 2014-01-14 20:31:51 +0800 | [diff] [blame] | 3917 | list_for_each_entry(ordered, logged_list, log_list) { |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 3918 | struct btrfs_ordered_sum *sum; |
| 3919 | |
| 3920 | if (!mod_len) |
| 3921 | break; |
| 3922 | |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 3923 | if (ordered->file_offset + ordered->len <= mod_start || |
| 3924 | mod_start + mod_len <= ordered->file_offset) |
| 3925 | continue; |
| 3926 | |
Filipe Manana | 8407f55 | 2014-09-05 15:14:39 +0100 | [diff] [blame] | 3927 | if (!test_bit(BTRFS_ORDERED_IO_DONE, &ordered->flags) && |
| 3928 | !test_bit(BTRFS_ORDERED_IOERR, &ordered->flags) && |
| 3929 | !test_bit(BTRFS_ORDERED_DIRECT, &ordered->flags)) { |
| 3930 | const u64 start = ordered->file_offset; |
| 3931 | const u64 end = ordered->file_offset + ordered->len - 1; |
| 3932 | |
| 3933 | WARN_ON(ordered->inode != inode); |
| 3934 | filemap_fdatawrite_range(inode->i_mapping, start, end); |
| 3935 | } |
| 3936 | |
| 3937 | wait_event(ordered->wait, |
| 3938 | (test_bit(BTRFS_ORDERED_IO_DONE, &ordered->flags) || |
| 3939 | test_bit(BTRFS_ORDERED_IOERR, &ordered->flags))); |
| 3940 | |
| 3941 | if (test_bit(BTRFS_ORDERED_IOERR, &ordered->flags)) { |
Filipe Manana | b38ef71 | 2014-11-13 17:01:45 +0000 | [diff] [blame] | 3942 | /* |
| 3943 | * Clear the AS_EIO/AS_ENOSPC flags from the inode's |
| 3944 | * i_mapping flags, so that the next fsync won't get |
| 3945 | * an outdated io error too. |
| 3946 | */ |
| 3947 | btrfs_inode_check_errors(inode); |
Filipe Manana | 8407f55 | 2014-09-05 15:14:39 +0100 | [diff] [blame] | 3948 | *ordered_io_error = true; |
| 3949 | break; |
| 3950 | } |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 3951 | /* |
| 3952 | * We are going to copy all the csums on this ordered extent, so |
| 3953 | * go ahead and adjust mod_start and mod_len in case this |
| 3954 | * ordered extent has already been logged. |
| 3955 | */ |
| 3956 | if (ordered->file_offset > mod_start) { |
| 3957 | if (ordered->file_offset + ordered->len >= |
| 3958 | mod_start + mod_len) |
| 3959 | mod_len = ordered->file_offset - mod_start; |
| 3960 | /* |
| 3961 | * If we have this case |
| 3962 | * |
| 3963 | * |--------- logged extent ---------| |
| 3964 | * |----- ordered extent ----| |
| 3965 | * |
| 3966 | * Just don't mess with mod_start and mod_len, we'll |
| 3967 | * just end up logging more csums than we need and it |
| 3968 | * will be ok. |
| 3969 | */ |
| 3970 | } else { |
| 3971 | if (ordered->file_offset + ordered->len < |
| 3972 | mod_start + mod_len) { |
| 3973 | mod_len = (mod_start + mod_len) - |
| 3974 | (ordered->file_offset + ordered->len); |
| 3975 | mod_start = ordered->file_offset + |
| 3976 | ordered->len; |
| 3977 | } else { |
| 3978 | mod_len = 0; |
| 3979 | } |
| 3980 | } |
| 3981 | |
Filipe Manana | 8407f55 | 2014-09-05 15:14:39 +0100 | [diff] [blame] | 3982 | if (skip_csum) |
| 3983 | continue; |
| 3984 | |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 3985 | /* |
| 3986 | * To keep us from looping for the above case of an ordered |
| 3987 | * extent that falls inside of the logged extent. |
| 3988 | */ |
| 3989 | if (test_and_set_bit(BTRFS_ORDERED_LOGGED_CSUM, |
| 3990 | &ordered->flags)) |
| 3991 | continue; |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 3992 | |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 3993 | list_for_each_entry(sum, &ordered->list, list) { |
| 3994 | ret = btrfs_csum_file_blocks(trans, log, sum); |
Miao Xie | 827463c | 2014-01-14 20:31:51 +0800 | [diff] [blame] | 3995 | if (ret) |
Filipe Manana | 8407f55 | 2014-09-05 15:14:39 +0100 | [diff] [blame] | 3996 | break; |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 3997 | } |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 3998 | } |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 3999 | |
Filipe Manana | 8407f55 | 2014-09-05 15:14:39 +0100 | [diff] [blame] | 4000 | if (*ordered_io_error || !mod_len || ret || skip_csum) |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 4001 | return ret; |
| 4002 | |
Filipe David Borba Manana | 488111a | 2013-10-28 16:30:29 +0000 | [diff] [blame] | 4003 | if (em->compress_type) { |
| 4004 | csum_offset = 0; |
Filipe Manana | 8407f55 | 2014-09-05 15:14:39 +0100 | [diff] [blame] | 4005 | csum_len = max(em->block_len, em->orig_block_len); |
Filipe David Borba Manana | 488111a | 2013-10-28 16:30:29 +0000 | [diff] [blame] | 4006 | } else { |
| 4007 | csum_offset = mod_start - em->start; |
| 4008 | csum_len = mod_len; |
| 4009 | } |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 4010 | |
Josef Bacik | 70c8a91 | 2012-10-11 16:54:30 -0400 | [diff] [blame] | 4011 | /* block start is already adjusted for the file extent offset. */ |
| 4012 | ret = btrfs_lookup_csums_range(log->fs_info->csum_root, |
| 4013 | em->block_start + csum_offset, |
| 4014 | em->block_start + csum_offset + |
| 4015 | csum_len - 1, &ordered_sums, 0); |
| 4016 | if (ret) |
| 4017 | return ret; |
| 4018 | |
| 4019 | while (!list_empty(&ordered_sums)) { |
| 4020 | struct btrfs_ordered_sum *sums = list_entry(ordered_sums.next, |
| 4021 | struct btrfs_ordered_sum, |
| 4022 | list); |
| 4023 | if (!ret) |
| 4024 | ret = btrfs_csum_file_blocks(trans, log, sums); |
| 4025 | list_del(&sums->list); |
| 4026 | kfree(sums); |
| 4027 | } |
| 4028 | |
| 4029 | return ret; |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 4030 | } |
| 4031 | |
Filipe Manana | 8407f55 | 2014-09-05 15:14:39 +0100 | [diff] [blame] | 4032 | static int log_one_extent(struct btrfs_trans_handle *trans, |
| 4033 | struct inode *inode, struct btrfs_root *root, |
| 4034 | const struct extent_map *em, |
| 4035 | struct btrfs_path *path, |
| 4036 | const struct list_head *logged_list, |
| 4037 | struct btrfs_log_ctx *ctx) |
| 4038 | { |
| 4039 | struct btrfs_root *log = root->log_root; |
| 4040 | struct btrfs_file_extent_item *fi; |
| 4041 | struct extent_buffer *leaf; |
| 4042 | struct btrfs_map_token token; |
| 4043 | struct btrfs_key key; |
| 4044 | u64 extent_offset = em->start - em->orig_start; |
| 4045 | u64 block_len; |
| 4046 | int ret; |
| 4047 | int extent_inserted = 0; |
| 4048 | bool ordered_io_err = false; |
| 4049 | |
| 4050 | ret = wait_ordered_extents(trans, inode, root, em, logged_list, |
| 4051 | &ordered_io_err); |
| 4052 | if (ret) |
| 4053 | return ret; |
| 4054 | |
| 4055 | if (ordered_io_err) { |
| 4056 | ctx->io_err = -EIO; |
| 4057 | return 0; |
| 4058 | } |
| 4059 | |
| 4060 | btrfs_init_map_token(&token); |
| 4061 | |
| 4062 | ret = __btrfs_drop_extents(trans, log, inode, path, em->start, |
| 4063 | em->start + em->len, NULL, 0, 1, |
| 4064 | sizeof(*fi), &extent_inserted); |
| 4065 | if (ret) |
| 4066 | return ret; |
| 4067 | |
| 4068 | if (!extent_inserted) { |
| 4069 | key.objectid = btrfs_ino(inode); |
| 4070 | key.type = BTRFS_EXTENT_DATA_KEY; |
| 4071 | key.offset = em->start; |
| 4072 | |
| 4073 | ret = btrfs_insert_empty_item(trans, log, path, &key, |
| 4074 | sizeof(*fi)); |
| 4075 | if (ret) |
| 4076 | return ret; |
| 4077 | } |
| 4078 | leaf = path->nodes[0]; |
| 4079 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 4080 | struct btrfs_file_extent_item); |
| 4081 | |
Josef Bacik | 50d9aa9 | 2014-11-21 14:52:38 -0500 | [diff] [blame] | 4082 | btrfs_set_token_file_extent_generation(leaf, fi, trans->transid, |
Filipe Manana | 8407f55 | 2014-09-05 15:14:39 +0100 | [diff] [blame] | 4083 | &token); |
| 4084 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) |
| 4085 | btrfs_set_token_file_extent_type(leaf, fi, |
| 4086 | BTRFS_FILE_EXTENT_PREALLOC, |
| 4087 | &token); |
| 4088 | else |
| 4089 | btrfs_set_token_file_extent_type(leaf, fi, |
| 4090 | BTRFS_FILE_EXTENT_REG, |
| 4091 | &token); |
| 4092 | |
| 4093 | block_len = max(em->block_len, em->orig_block_len); |
| 4094 | if (em->compress_type != BTRFS_COMPRESS_NONE) { |
| 4095 | btrfs_set_token_file_extent_disk_bytenr(leaf, fi, |
| 4096 | em->block_start, |
| 4097 | &token); |
| 4098 | btrfs_set_token_file_extent_disk_num_bytes(leaf, fi, block_len, |
| 4099 | &token); |
| 4100 | } else if (em->block_start < EXTENT_MAP_LAST_BYTE) { |
| 4101 | btrfs_set_token_file_extent_disk_bytenr(leaf, fi, |
| 4102 | em->block_start - |
| 4103 | extent_offset, &token); |
| 4104 | btrfs_set_token_file_extent_disk_num_bytes(leaf, fi, block_len, |
| 4105 | &token); |
| 4106 | } else { |
| 4107 | btrfs_set_token_file_extent_disk_bytenr(leaf, fi, 0, &token); |
| 4108 | btrfs_set_token_file_extent_disk_num_bytes(leaf, fi, 0, |
| 4109 | &token); |
| 4110 | } |
| 4111 | |
| 4112 | btrfs_set_token_file_extent_offset(leaf, fi, extent_offset, &token); |
| 4113 | btrfs_set_token_file_extent_num_bytes(leaf, fi, em->len, &token); |
| 4114 | btrfs_set_token_file_extent_ram_bytes(leaf, fi, em->ram_bytes, &token); |
| 4115 | btrfs_set_token_file_extent_compression(leaf, fi, em->compress_type, |
| 4116 | &token); |
| 4117 | btrfs_set_token_file_extent_encryption(leaf, fi, 0, &token); |
| 4118 | btrfs_set_token_file_extent_other_encoding(leaf, fi, 0, &token); |
| 4119 | btrfs_mark_buffer_dirty(leaf); |
| 4120 | |
| 4121 | btrfs_release_path(path); |
| 4122 | |
| 4123 | return ret; |
| 4124 | } |
| 4125 | |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 4126 | static int btrfs_log_changed_extents(struct btrfs_trans_handle *trans, |
| 4127 | struct btrfs_root *root, |
| 4128 | struct inode *inode, |
Miao Xie | 827463c | 2014-01-14 20:31:51 +0800 | [diff] [blame] | 4129 | struct btrfs_path *path, |
Filipe Manana | 8407f55 | 2014-09-05 15:14:39 +0100 | [diff] [blame] | 4130 | struct list_head *logged_list, |
Filipe Manana | de0ee0e | 2016-01-21 10:17:54 +0000 | [diff] [blame] | 4131 | struct btrfs_log_ctx *ctx, |
| 4132 | const u64 start, |
| 4133 | const u64 end) |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 4134 | { |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 4135 | struct extent_map *em, *n; |
| 4136 | struct list_head extents; |
| 4137 | struct extent_map_tree *tree = &BTRFS_I(inode)->extent_tree; |
| 4138 | u64 test_gen; |
| 4139 | int ret = 0; |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 4140 | int num = 0; |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 4141 | |
| 4142 | INIT_LIST_HEAD(&extents); |
| 4143 | |
Filipe Manana | 5f9a8a5 | 2016-05-12 13:53:36 +0100 | [diff] [blame] | 4144 | down_write(&BTRFS_I(inode)->dio_sem); |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 4145 | write_lock(&tree->lock); |
| 4146 | test_gen = root->fs_info->last_trans_committed; |
| 4147 | |
| 4148 | list_for_each_entry_safe(em, n, &tree->modified_extents, list) { |
| 4149 | list_del_init(&em->list); |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 4150 | |
| 4151 | /* |
| 4152 | * Just an arbitrary number, this can be really CPU intensive |
| 4153 | * once we start getting a lot of extents, and really once we |
| 4154 | * have a bunch of extents we just want to commit since it will |
| 4155 | * be faster. |
| 4156 | */ |
| 4157 | if (++num > 32768) { |
| 4158 | list_del_init(&tree->modified_extents); |
| 4159 | ret = -EFBIG; |
| 4160 | goto process; |
| 4161 | } |
| 4162 | |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 4163 | if (em->generation <= test_gen) |
| 4164 | continue; |
Josef Bacik | ff44c6e | 2012-09-14 12:59:20 -0400 | [diff] [blame] | 4165 | /* Need a ref to keep it from getting evicted from cache */ |
| 4166 | atomic_inc(&em->refs); |
| 4167 | set_bit(EXTENT_FLAG_LOGGING, &em->flags); |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 4168 | list_add_tail(&em->list, &extents); |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 4169 | num++; |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 4170 | } |
| 4171 | |
| 4172 | list_sort(NULL, &extents, extent_cmp); |
Filipe Manana | de0ee0e | 2016-01-21 10:17:54 +0000 | [diff] [blame] | 4173 | btrfs_get_logged_extents(inode, logged_list, start, end); |
Filipe Manana | 5f9a8a5 | 2016-05-12 13:53:36 +0100 | [diff] [blame] | 4174 | /* |
| 4175 | * Some ordered extents started by fsync might have completed |
| 4176 | * before we could collect them into the list logged_list, which |
| 4177 | * means they're gone, not in our logged_list nor in the inode's |
| 4178 | * ordered tree. We want the application/user space to know an |
| 4179 | * error happened while attempting to persist file data so that |
| 4180 | * it can take proper action. If such error happened, we leave |
| 4181 | * without writing to the log tree and the fsync must report the |
| 4182 | * file data write error and not commit the current transaction. |
| 4183 | */ |
| 4184 | ret = btrfs_inode_check_errors(inode); |
| 4185 | if (ret) |
| 4186 | ctx->io_err = ret; |
Josef Bacik | 2ab28f3 | 2012-10-12 15:27:49 -0400 | [diff] [blame] | 4187 | process: |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 4188 | while (!list_empty(&extents)) { |
| 4189 | em = list_entry(extents.next, struct extent_map, list); |
| 4190 | |
| 4191 | list_del_init(&em->list); |
| 4192 | |
| 4193 | /* |
| 4194 | * If we had an error we just need to delete everybody from our |
| 4195 | * private list. |
| 4196 | */ |
Josef Bacik | ff44c6e | 2012-09-14 12:59:20 -0400 | [diff] [blame] | 4197 | if (ret) { |
Josef Bacik | 201a903 | 2013-01-24 12:02:07 -0500 | [diff] [blame] | 4198 | clear_em_logging(tree, em); |
Josef Bacik | ff44c6e | 2012-09-14 12:59:20 -0400 | [diff] [blame] | 4199 | free_extent_map(em); |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 4200 | continue; |
Josef Bacik | ff44c6e | 2012-09-14 12:59:20 -0400 | [diff] [blame] | 4201 | } |
| 4202 | |
| 4203 | write_unlock(&tree->lock); |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 4204 | |
Filipe Manana | 8407f55 | 2014-09-05 15:14:39 +0100 | [diff] [blame] | 4205 | ret = log_one_extent(trans, inode, root, em, path, logged_list, |
| 4206 | ctx); |
Josef Bacik | ff44c6e | 2012-09-14 12:59:20 -0400 | [diff] [blame] | 4207 | write_lock(&tree->lock); |
Josef Bacik | 201a903 | 2013-01-24 12:02:07 -0500 | [diff] [blame] | 4208 | clear_em_logging(tree, em); |
| 4209 | free_extent_map(em); |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 4210 | } |
Josef Bacik | ff44c6e | 2012-09-14 12:59:20 -0400 | [diff] [blame] | 4211 | WARN_ON(!list_empty(&extents)); |
| 4212 | write_unlock(&tree->lock); |
Filipe Manana | 5f9a8a5 | 2016-05-12 13:53:36 +0100 | [diff] [blame] | 4213 | up_write(&BTRFS_I(inode)->dio_sem); |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 4214 | |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 4215 | btrfs_release_path(path); |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 4216 | return ret; |
| 4217 | } |
| 4218 | |
Filipe Manana | 1a4bcf4 | 2015-02-13 12:30:56 +0000 | [diff] [blame] | 4219 | static int logged_inode_size(struct btrfs_root *log, struct inode *inode, |
| 4220 | struct btrfs_path *path, u64 *size_ret) |
| 4221 | { |
| 4222 | struct btrfs_key key; |
| 4223 | int ret; |
| 4224 | |
| 4225 | key.objectid = btrfs_ino(inode); |
| 4226 | key.type = BTRFS_INODE_ITEM_KEY; |
| 4227 | key.offset = 0; |
| 4228 | |
| 4229 | ret = btrfs_search_slot(NULL, log, &key, path, 0, 0); |
| 4230 | if (ret < 0) { |
| 4231 | return ret; |
| 4232 | } else if (ret > 0) { |
Filipe Manana | 2f2ff0e | 2015-03-20 17:19:46 +0000 | [diff] [blame] | 4233 | *size_ret = 0; |
Filipe Manana | 1a4bcf4 | 2015-02-13 12:30:56 +0000 | [diff] [blame] | 4234 | } else { |
| 4235 | struct btrfs_inode_item *item; |
| 4236 | |
| 4237 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
| 4238 | struct btrfs_inode_item); |
| 4239 | *size_ret = btrfs_inode_size(path->nodes[0], item); |
| 4240 | } |
| 4241 | |
| 4242 | btrfs_release_path(path); |
| 4243 | return 0; |
| 4244 | } |
| 4245 | |
Filipe Manana | 36283bf | 2015-06-20 00:44:51 +0100 | [diff] [blame] | 4246 | /* |
| 4247 | * At the moment we always log all xattrs. This is to figure out at log replay |
| 4248 | * time which xattrs must have their deletion replayed. If a xattr is missing |
| 4249 | * in the log tree and exists in the fs/subvol tree, we delete it. This is |
| 4250 | * because if a xattr is deleted, the inode is fsynced and a power failure |
| 4251 | * happens, causing the log to be replayed the next time the fs is mounted, |
| 4252 | * we want the xattr to not exist anymore (same behaviour as other filesystems |
| 4253 | * with a journal, ext3/4, xfs, f2fs, etc). |
| 4254 | */ |
| 4255 | static int btrfs_log_all_xattrs(struct btrfs_trans_handle *trans, |
| 4256 | struct btrfs_root *root, |
| 4257 | struct inode *inode, |
| 4258 | struct btrfs_path *path, |
| 4259 | struct btrfs_path *dst_path) |
| 4260 | { |
| 4261 | int ret; |
| 4262 | struct btrfs_key key; |
| 4263 | const u64 ino = btrfs_ino(inode); |
| 4264 | int ins_nr = 0; |
| 4265 | int start_slot = 0; |
| 4266 | |
| 4267 | key.objectid = ino; |
| 4268 | key.type = BTRFS_XATTR_ITEM_KEY; |
| 4269 | key.offset = 0; |
| 4270 | |
| 4271 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 4272 | if (ret < 0) |
| 4273 | return ret; |
| 4274 | |
| 4275 | while (true) { |
| 4276 | int slot = path->slots[0]; |
| 4277 | struct extent_buffer *leaf = path->nodes[0]; |
| 4278 | int nritems = btrfs_header_nritems(leaf); |
| 4279 | |
| 4280 | if (slot >= nritems) { |
| 4281 | if (ins_nr > 0) { |
| 4282 | u64 last_extent = 0; |
| 4283 | |
| 4284 | ret = copy_items(trans, inode, dst_path, path, |
| 4285 | &last_extent, start_slot, |
| 4286 | ins_nr, 1, 0); |
| 4287 | /* can't be 1, extent items aren't processed */ |
| 4288 | ASSERT(ret <= 0); |
| 4289 | if (ret < 0) |
| 4290 | return ret; |
| 4291 | ins_nr = 0; |
| 4292 | } |
| 4293 | ret = btrfs_next_leaf(root, path); |
| 4294 | if (ret < 0) |
| 4295 | return ret; |
| 4296 | else if (ret > 0) |
| 4297 | break; |
| 4298 | continue; |
| 4299 | } |
| 4300 | |
| 4301 | btrfs_item_key_to_cpu(leaf, &key, slot); |
| 4302 | if (key.objectid != ino || key.type != BTRFS_XATTR_ITEM_KEY) |
| 4303 | break; |
| 4304 | |
| 4305 | if (ins_nr == 0) |
| 4306 | start_slot = slot; |
| 4307 | ins_nr++; |
| 4308 | path->slots[0]++; |
| 4309 | cond_resched(); |
| 4310 | } |
| 4311 | if (ins_nr > 0) { |
| 4312 | u64 last_extent = 0; |
| 4313 | |
| 4314 | ret = copy_items(trans, inode, dst_path, path, |
| 4315 | &last_extent, start_slot, |
| 4316 | ins_nr, 1, 0); |
| 4317 | /* can't be 1, extent items aren't processed */ |
| 4318 | ASSERT(ret <= 0); |
| 4319 | if (ret < 0) |
| 4320 | return ret; |
| 4321 | } |
| 4322 | |
| 4323 | return 0; |
| 4324 | } |
| 4325 | |
Filipe Manana | a89ca6f | 2015-06-25 04:17:46 +0100 | [diff] [blame] | 4326 | /* |
| 4327 | * If the no holes feature is enabled we need to make sure any hole between the |
| 4328 | * last extent and the i_size of our inode is explicitly marked in the log. This |
| 4329 | * is to make sure that doing something like: |
| 4330 | * |
| 4331 | * 1) create file with 128Kb of data |
| 4332 | * 2) truncate file to 64Kb |
| 4333 | * 3) truncate file to 256Kb |
| 4334 | * 4) fsync file |
| 4335 | * 5) <crash/power failure> |
| 4336 | * 6) mount fs and trigger log replay |
| 4337 | * |
| 4338 | * Will give us a file with a size of 256Kb, the first 64Kb of data match what |
| 4339 | * the file had in its first 64Kb of data at step 1 and the last 192Kb of the |
| 4340 | * file correspond to a hole. The presence of explicit holes in a log tree is |
| 4341 | * what guarantees that log replay will remove/adjust file extent items in the |
| 4342 | * fs/subvol tree. |
| 4343 | * |
| 4344 | * Here we do not need to care about holes between extents, that is already done |
| 4345 | * by copy_items(). We also only need to do this in the full sync path, where we |
| 4346 | * lookup for extents from the fs/subvol tree only. In the fast path case, we |
| 4347 | * lookup the list of modified extent maps and if any represents a hole, we |
| 4348 | * insert a corresponding extent representing a hole in the log tree. |
| 4349 | */ |
| 4350 | static int btrfs_log_trailing_hole(struct btrfs_trans_handle *trans, |
| 4351 | struct btrfs_root *root, |
| 4352 | struct inode *inode, |
| 4353 | struct btrfs_path *path) |
| 4354 | { |
| 4355 | int ret; |
| 4356 | struct btrfs_key key; |
| 4357 | u64 hole_start; |
| 4358 | u64 hole_size; |
| 4359 | struct extent_buffer *leaf; |
| 4360 | struct btrfs_root *log = root->log_root; |
| 4361 | const u64 ino = btrfs_ino(inode); |
| 4362 | const u64 i_size = i_size_read(inode); |
| 4363 | |
| 4364 | if (!btrfs_fs_incompat(root->fs_info, NO_HOLES)) |
| 4365 | return 0; |
| 4366 | |
| 4367 | key.objectid = ino; |
| 4368 | key.type = BTRFS_EXTENT_DATA_KEY; |
| 4369 | key.offset = (u64)-1; |
| 4370 | |
| 4371 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 4372 | ASSERT(ret != 0); |
| 4373 | if (ret < 0) |
| 4374 | return ret; |
| 4375 | |
| 4376 | ASSERT(path->slots[0] > 0); |
| 4377 | path->slots[0]--; |
| 4378 | leaf = path->nodes[0]; |
| 4379 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| 4380 | |
| 4381 | if (key.objectid != ino || key.type != BTRFS_EXTENT_DATA_KEY) { |
| 4382 | /* inode does not have any extents */ |
| 4383 | hole_start = 0; |
| 4384 | hole_size = i_size; |
| 4385 | } else { |
| 4386 | struct btrfs_file_extent_item *extent; |
| 4387 | u64 len; |
| 4388 | |
| 4389 | /* |
| 4390 | * If there's an extent beyond i_size, an explicit hole was |
| 4391 | * already inserted by copy_items(). |
| 4392 | */ |
| 4393 | if (key.offset >= i_size) |
| 4394 | return 0; |
| 4395 | |
| 4396 | extent = btrfs_item_ptr(leaf, path->slots[0], |
| 4397 | struct btrfs_file_extent_item); |
| 4398 | |
| 4399 | if (btrfs_file_extent_type(leaf, extent) == |
| 4400 | BTRFS_FILE_EXTENT_INLINE) { |
| 4401 | len = btrfs_file_extent_inline_len(leaf, |
| 4402 | path->slots[0], |
| 4403 | extent); |
| 4404 | ASSERT(len == i_size); |
| 4405 | return 0; |
| 4406 | } |
| 4407 | |
| 4408 | len = btrfs_file_extent_num_bytes(leaf, extent); |
| 4409 | /* Last extent goes beyond i_size, no need to log a hole. */ |
| 4410 | if (key.offset + len > i_size) |
| 4411 | return 0; |
| 4412 | hole_start = key.offset + len; |
| 4413 | hole_size = i_size - hole_start; |
| 4414 | } |
| 4415 | btrfs_release_path(path); |
| 4416 | |
| 4417 | /* Last extent ends at i_size. */ |
| 4418 | if (hole_size == 0) |
| 4419 | return 0; |
| 4420 | |
| 4421 | hole_size = ALIGN(hole_size, root->sectorsize); |
| 4422 | ret = btrfs_insert_file_extent(trans, log, ino, hole_start, 0, 0, |
| 4423 | hole_size, 0, hole_size, 0, 0, 0); |
| 4424 | return ret; |
| 4425 | } |
| 4426 | |
Filipe Manana | 56f23fd | 2016-03-30 23:37:21 +0100 | [diff] [blame] | 4427 | /* |
| 4428 | * When we are logging a new inode X, check if it doesn't have a reference that |
| 4429 | * matches the reference from some other inode Y created in a past transaction |
| 4430 | * and that was renamed in the current transaction. If we don't do this, then at |
| 4431 | * log replay time we can lose inode Y (and all its files if it's a directory): |
| 4432 | * |
| 4433 | * mkdir /mnt/x |
| 4434 | * echo "hello world" > /mnt/x/foobar |
| 4435 | * sync |
| 4436 | * mv /mnt/x /mnt/y |
| 4437 | * mkdir /mnt/x # or touch /mnt/x |
| 4438 | * xfs_io -c fsync /mnt/x |
| 4439 | * <power fail> |
| 4440 | * mount fs, trigger log replay |
| 4441 | * |
| 4442 | * After the log replay procedure, we would lose the first directory and all its |
| 4443 | * files (file foobar). |
| 4444 | * For the case where inode Y is not a directory we simply end up losing it: |
| 4445 | * |
| 4446 | * echo "123" > /mnt/foo |
| 4447 | * sync |
| 4448 | * mv /mnt/foo /mnt/bar |
| 4449 | * echo "abc" > /mnt/foo |
| 4450 | * xfs_io -c fsync /mnt/foo |
| 4451 | * <power fail> |
| 4452 | * |
| 4453 | * We also need this for cases where a snapshot entry is replaced by some other |
| 4454 | * entry (file or directory) otherwise we end up with an unreplayable log due to |
| 4455 | * attempts to delete the snapshot entry (entry of type BTRFS_ROOT_ITEM_KEY) as |
| 4456 | * if it were a regular entry: |
| 4457 | * |
| 4458 | * mkdir /mnt/x |
| 4459 | * btrfs subvolume snapshot /mnt /mnt/x/snap |
| 4460 | * btrfs subvolume delete /mnt/x/snap |
| 4461 | * rmdir /mnt/x |
| 4462 | * mkdir /mnt/x |
| 4463 | * fsync /mnt/x or fsync some new file inside it |
| 4464 | * <power fail> |
| 4465 | * |
| 4466 | * The snapshot delete, rmdir of x, mkdir of a new x and the fsync all happen in |
| 4467 | * the same transaction. |
| 4468 | */ |
| 4469 | static int btrfs_check_ref_name_override(struct extent_buffer *eb, |
| 4470 | const int slot, |
| 4471 | const struct btrfs_key *key, |
| 4472 | struct inode *inode) |
| 4473 | { |
| 4474 | int ret; |
| 4475 | struct btrfs_path *search_path; |
| 4476 | char *name = NULL; |
| 4477 | u32 name_len = 0; |
| 4478 | u32 item_size = btrfs_item_size_nr(eb, slot); |
| 4479 | u32 cur_offset = 0; |
| 4480 | unsigned long ptr = btrfs_item_ptr_offset(eb, slot); |
| 4481 | |
| 4482 | search_path = btrfs_alloc_path(); |
| 4483 | if (!search_path) |
| 4484 | return -ENOMEM; |
| 4485 | search_path->search_commit_root = 1; |
| 4486 | search_path->skip_locking = 1; |
| 4487 | |
| 4488 | while (cur_offset < item_size) { |
| 4489 | u64 parent; |
| 4490 | u32 this_name_len; |
| 4491 | u32 this_len; |
| 4492 | unsigned long name_ptr; |
| 4493 | struct btrfs_dir_item *di; |
| 4494 | |
| 4495 | if (key->type == BTRFS_INODE_REF_KEY) { |
| 4496 | struct btrfs_inode_ref *iref; |
| 4497 | |
| 4498 | iref = (struct btrfs_inode_ref *)(ptr + cur_offset); |
| 4499 | parent = key->offset; |
| 4500 | this_name_len = btrfs_inode_ref_name_len(eb, iref); |
| 4501 | name_ptr = (unsigned long)(iref + 1); |
| 4502 | this_len = sizeof(*iref) + this_name_len; |
| 4503 | } else { |
| 4504 | struct btrfs_inode_extref *extref; |
| 4505 | |
| 4506 | extref = (struct btrfs_inode_extref *)(ptr + |
| 4507 | cur_offset); |
| 4508 | parent = btrfs_inode_extref_parent(eb, extref); |
| 4509 | this_name_len = btrfs_inode_extref_name_len(eb, extref); |
| 4510 | name_ptr = (unsigned long)&extref->name; |
| 4511 | this_len = sizeof(*extref) + this_name_len; |
| 4512 | } |
| 4513 | |
| 4514 | if (this_name_len > name_len) { |
| 4515 | char *new_name; |
| 4516 | |
| 4517 | new_name = krealloc(name, this_name_len, GFP_NOFS); |
| 4518 | if (!new_name) { |
| 4519 | ret = -ENOMEM; |
| 4520 | goto out; |
| 4521 | } |
| 4522 | name_len = this_name_len; |
| 4523 | name = new_name; |
| 4524 | } |
| 4525 | |
| 4526 | read_extent_buffer(eb, name, name_ptr, this_name_len); |
| 4527 | di = btrfs_lookup_dir_item(NULL, BTRFS_I(inode)->root, |
| 4528 | search_path, parent, |
| 4529 | name, this_name_len, 0); |
| 4530 | if (di && !IS_ERR(di)) { |
| 4531 | ret = 1; |
| 4532 | goto out; |
| 4533 | } else if (IS_ERR(di)) { |
| 4534 | ret = PTR_ERR(di); |
| 4535 | goto out; |
| 4536 | } |
| 4537 | btrfs_release_path(search_path); |
| 4538 | |
| 4539 | cur_offset += this_len; |
| 4540 | } |
| 4541 | ret = 0; |
| 4542 | out: |
| 4543 | btrfs_free_path(search_path); |
| 4544 | kfree(name); |
| 4545 | return ret; |
| 4546 | } |
| 4547 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4548 | /* log a single inode in the tree log. |
| 4549 | * At least one parent directory for this inode must exist in the tree |
| 4550 | * or be logged already. |
| 4551 | * |
| 4552 | * Any items from this inode changed by the current transaction are copied |
| 4553 | * to the log tree. An extra reference is taken on any extents in this |
| 4554 | * file, allowing us to avoid a whole pile of corner cases around logging |
| 4555 | * blocks that have been removed from the tree. |
| 4556 | * |
| 4557 | * See LOG_INODE_ALL and related defines for a description of what inode_only |
| 4558 | * does. |
| 4559 | * |
| 4560 | * This handles both files and directories. |
| 4561 | */ |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 4562 | static int btrfs_log_inode(struct btrfs_trans_handle *trans, |
Filipe Manana | 49dae1b | 2014-09-06 22:34:39 +0100 | [diff] [blame] | 4563 | struct btrfs_root *root, struct inode *inode, |
| 4564 | int inode_only, |
| 4565 | const loff_t start, |
Filipe Manana | 8407f55 | 2014-09-05 15:14:39 +0100 | [diff] [blame] | 4566 | const loff_t end, |
| 4567 | struct btrfs_log_ctx *ctx) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4568 | { |
| 4569 | struct btrfs_path *path; |
| 4570 | struct btrfs_path *dst_path; |
| 4571 | struct btrfs_key min_key; |
| 4572 | struct btrfs_key max_key; |
| 4573 | struct btrfs_root *log = root->log_root; |
Chris Mason | 31ff1cd | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 4574 | struct extent_buffer *src = NULL; |
Miao Xie | 827463c | 2014-01-14 20:31:51 +0800 | [diff] [blame] | 4575 | LIST_HEAD(logged_list); |
Josef Bacik | 16e7549 | 2013-10-22 12:18:51 -0400 | [diff] [blame] | 4576 | u64 last_extent = 0; |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4577 | int err = 0; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4578 | int ret; |
Chris Mason | 3a5f1d4 | 2008-09-11 15:53:37 -0400 | [diff] [blame] | 4579 | int nritems; |
Chris Mason | 31ff1cd | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 4580 | int ins_start_slot = 0; |
| 4581 | int ins_nr; |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 4582 | bool fast_search = false; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4583 | u64 ino = btrfs_ino(inode); |
Filipe Manana | 49dae1b | 2014-09-06 22:34:39 +0100 | [diff] [blame] | 4584 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
Filipe Manana | 1a4bcf4 | 2015-02-13 12:30:56 +0000 | [diff] [blame] | 4585 | u64 logged_isize = 0; |
Filipe Manana | e4545de | 2015-06-17 12:49:23 +0100 | [diff] [blame] | 4586 | bool need_log_inode_item = true; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4587 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4588 | path = btrfs_alloc_path(); |
Tsutomu Itoh | 5df6708 | 2011-02-01 09:17:35 +0000 | [diff] [blame] | 4589 | if (!path) |
| 4590 | return -ENOMEM; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4591 | dst_path = btrfs_alloc_path(); |
Tsutomu Itoh | 5df6708 | 2011-02-01 09:17:35 +0000 | [diff] [blame] | 4592 | if (!dst_path) { |
| 4593 | btrfs_free_path(path); |
| 4594 | return -ENOMEM; |
| 4595 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4596 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4597 | min_key.objectid = ino; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4598 | min_key.type = BTRFS_INODE_ITEM_KEY; |
| 4599 | min_key.offset = 0; |
| 4600 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4601 | max_key.objectid = ino; |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 4602 | |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 4603 | |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 4604 | /* today the code can only do partial logging of directories */ |
Miao Xie | 5269b67 | 2012-11-01 07:35:23 +0000 | [diff] [blame] | 4605 | if (S_ISDIR(inode->i_mode) || |
| 4606 | (!test_bit(BTRFS_INODE_NEEDS_FULL_SYNC, |
| 4607 | &BTRFS_I(inode)->runtime_flags) && |
| 4608 | inode_only == LOG_INODE_EXISTS)) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4609 | max_key.type = BTRFS_XATTR_ITEM_KEY; |
| 4610 | else |
| 4611 | max_key.type = (u8)-1; |
| 4612 | max_key.offset = (u64)-1; |
| 4613 | |
Filipe Manana | 2c2c452 | 2015-01-13 16:40:04 +0000 | [diff] [blame] | 4614 | /* |
| 4615 | * Only run delayed items if we are a dir or a new file. |
| 4616 | * Otherwise commit the delayed inode only, which is needed in |
| 4617 | * order for the log replay code to mark inodes for link count |
| 4618 | * fixup (create temporary BTRFS_TREE_LOG_FIXUP_OBJECTID items). |
| 4619 | */ |
Josef Bacik | 94edf4a | 2012-09-25 14:56:25 -0400 | [diff] [blame] | 4620 | if (S_ISDIR(inode->i_mode) || |
Filipe Manana | 2c2c452 | 2015-01-13 16:40:04 +0000 | [diff] [blame] | 4621 | BTRFS_I(inode)->generation > root->fs_info->last_trans_committed) |
Josef Bacik | 94edf4a | 2012-09-25 14:56:25 -0400 | [diff] [blame] | 4622 | ret = btrfs_commit_inode_delayed_items(trans, inode); |
Filipe Manana | 2c2c452 | 2015-01-13 16:40:04 +0000 | [diff] [blame] | 4623 | else |
| 4624 | ret = btrfs_commit_inode_delayed_inode(inode); |
| 4625 | |
| 4626 | if (ret) { |
| 4627 | btrfs_free_path(path); |
| 4628 | btrfs_free_path(dst_path); |
| 4629 | return ret; |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 4630 | } |
| 4631 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4632 | mutex_lock(&BTRFS_I(inode)->log_mutex); |
| 4633 | |
Filipe Manana | 5e33a2b | 2016-02-25 23:19:38 +0000 | [diff] [blame] | 4634 | /* |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4635 | * a brute force approach to making sure we get the most uptodate |
| 4636 | * copies of everything. |
| 4637 | */ |
| 4638 | if (S_ISDIR(inode->i_mode)) { |
| 4639 | int max_key_type = BTRFS_DIR_LOG_INDEX_KEY; |
| 4640 | |
Filipe Manana | 4f764e5 | 2015-02-23 19:53:35 +0000 | [diff] [blame] | 4641 | if (inode_only == LOG_INODE_EXISTS) |
| 4642 | max_key_type = BTRFS_XATTR_ITEM_KEY; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4643 | ret = drop_objectid_items(trans, log, path, ino, max_key_type); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4644 | } else { |
Filipe Manana | 1a4bcf4 | 2015-02-13 12:30:56 +0000 | [diff] [blame] | 4645 | if (inode_only == LOG_INODE_EXISTS) { |
| 4646 | /* |
| 4647 | * Make sure the new inode item we write to the log has |
| 4648 | * the same isize as the current one (if it exists). |
| 4649 | * This is necessary to prevent data loss after log |
| 4650 | * replay, and also to prevent doing a wrong expanding |
| 4651 | * truncate - for e.g. create file, write 4K into offset |
| 4652 | * 0, fsync, write 4K into offset 4096, add hard link, |
| 4653 | * fsync some other file (to sync log), power fail - if |
| 4654 | * we use the inode's current i_size, after log replay |
| 4655 | * we get a 8Kb file, with the last 4Kb extent as a hole |
| 4656 | * (zeroes), as if an expanding truncate happened, |
| 4657 | * instead of getting a file of 4Kb only. |
| 4658 | */ |
| 4659 | err = logged_inode_size(log, inode, path, |
| 4660 | &logged_isize); |
| 4661 | if (err) |
| 4662 | goto out_unlock; |
| 4663 | } |
Filipe Manana | a742994 | 2015-02-13 16:56:14 +0000 | [diff] [blame] | 4664 | if (test_bit(BTRFS_INODE_NEEDS_FULL_SYNC, |
| 4665 | &BTRFS_I(inode)->runtime_flags)) { |
| 4666 | if (inode_only == LOG_INODE_EXISTS) { |
Filipe Manana | 4f764e5 | 2015-02-23 19:53:35 +0000 | [diff] [blame] | 4667 | max_key.type = BTRFS_XATTR_ITEM_KEY; |
Filipe Manana | a742994 | 2015-02-13 16:56:14 +0000 | [diff] [blame] | 4668 | ret = drop_objectid_items(trans, log, path, ino, |
| 4669 | max_key.type); |
| 4670 | } else { |
| 4671 | clear_bit(BTRFS_INODE_NEEDS_FULL_SYNC, |
| 4672 | &BTRFS_I(inode)->runtime_flags); |
| 4673 | clear_bit(BTRFS_INODE_COPY_EVERYTHING, |
| 4674 | &BTRFS_I(inode)->runtime_flags); |
Chris Mason | 28ed134 | 2014-12-17 09:41:04 -0800 | [diff] [blame] | 4675 | while(1) { |
| 4676 | ret = btrfs_truncate_inode_items(trans, |
| 4677 | log, inode, 0, 0); |
| 4678 | if (ret != -EAGAIN) |
| 4679 | break; |
| 4680 | } |
Filipe Manana | a742994 | 2015-02-13 16:56:14 +0000 | [diff] [blame] | 4681 | } |
Filipe Manana | 4f764e5 | 2015-02-23 19:53:35 +0000 | [diff] [blame] | 4682 | } else if (test_and_clear_bit(BTRFS_INODE_COPY_EVERYTHING, |
| 4683 | &BTRFS_I(inode)->runtime_flags) || |
Josef Bacik | 6cfab85 | 2013-11-12 16:25:58 -0500 | [diff] [blame] | 4684 | inode_only == LOG_INODE_EXISTS) { |
Filipe Manana | 4f764e5 | 2015-02-23 19:53:35 +0000 | [diff] [blame] | 4685 | if (inode_only == LOG_INODE_ALL) |
Josef Bacik | a95249b | 2012-10-11 16:17:34 -0400 | [diff] [blame] | 4686 | fast_search = true; |
Filipe Manana | 4f764e5 | 2015-02-23 19:53:35 +0000 | [diff] [blame] | 4687 | max_key.type = BTRFS_XATTR_ITEM_KEY; |
Josef Bacik | a95249b | 2012-10-11 16:17:34 -0400 | [diff] [blame] | 4688 | ret = drop_objectid_items(trans, log, path, ino, |
| 4689 | max_key.type); |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 4690 | } else { |
Liu Bo | 183f37f | 2012-11-01 06:38:47 +0000 | [diff] [blame] | 4691 | if (inode_only == LOG_INODE_ALL) |
| 4692 | fast_search = true; |
Josef Bacik | a95249b | 2012-10-11 16:17:34 -0400 | [diff] [blame] | 4693 | goto log_extents; |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 4694 | } |
Josef Bacik | a95249b | 2012-10-11 16:17:34 -0400 | [diff] [blame] | 4695 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4696 | } |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4697 | if (ret) { |
| 4698 | err = ret; |
| 4699 | goto out_unlock; |
| 4700 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4701 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4702 | while (1) { |
Chris Mason | 31ff1cd | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 4703 | ins_nr = 0; |
Filipe David Borba Manana | 6174d3c | 2013-10-01 16:13:42 +0100 | [diff] [blame] | 4704 | ret = btrfs_search_forward(root, &min_key, |
Eric Sandeen | de78b51 | 2013-01-31 18:21:12 +0000 | [diff] [blame] | 4705 | path, trans->transid); |
Liu Bo | fb770ae | 2016-07-05 12:10:14 -0700 | [diff] [blame] | 4706 | if (ret < 0) { |
| 4707 | err = ret; |
| 4708 | goto out_unlock; |
| 4709 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4710 | if (ret != 0) |
| 4711 | break; |
Chris Mason | 3a5f1d4 | 2008-09-11 15:53:37 -0400 | [diff] [blame] | 4712 | again: |
Chris Mason | 31ff1cd | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 4713 | /* note, ins_nr might be > 0 here, cleanup outside the loop */ |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4714 | if (min_key.objectid != ino) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4715 | break; |
| 4716 | if (min_key.type > max_key.type) |
| 4717 | break; |
Chris Mason | 31ff1cd | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 4718 | |
Filipe Manana | e4545de | 2015-06-17 12:49:23 +0100 | [diff] [blame] | 4719 | if (min_key.type == BTRFS_INODE_ITEM_KEY) |
| 4720 | need_log_inode_item = false; |
| 4721 | |
Filipe Manana | 56f23fd | 2016-03-30 23:37:21 +0100 | [diff] [blame] | 4722 | if ((min_key.type == BTRFS_INODE_REF_KEY || |
| 4723 | min_key.type == BTRFS_INODE_EXTREF_KEY) && |
| 4724 | BTRFS_I(inode)->generation == trans->transid) { |
| 4725 | ret = btrfs_check_ref_name_override(path->nodes[0], |
| 4726 | path->slots[0], |
| 4727 | &min_key, inode); |
| 4728 | if (ret < 0) { |
| 4729 | err = ret; |
| 4730 | goto out_unlock; |
| 4731 | } else if (ret > 0) { |
| 4732 | err = 1; |
| 4733 | btrfs_set_log_full_commit(root->fs_info, trans); |
| 4734 | goto out_unlock; |
| 4735 | } |
| 4736 | } |
| 4737 | |
Filipe Manana | 36283bf | 2015-06-20 00:44:51 +0100 | [diff] [blame] | 4738 | /* Skip xattrs, we log them later with btrfs_log_all_xattrs() */ |
| 4739 | if (min_key.type == BTRFS_XATTR_ITEM_KEY) { |
| 4740 | if (ins_nr == 0) |
| 4741 | goto next_slot; |
| 4742 | ret = copy_items(trans, inode, dst_path, path, |
| 4743 | &last_extent, ins_start_slot, |
| 4744 | ins_nr, inode_only, logged_isize); |
| 4745 | if (ret < 0) { |
| 4746 | err = ret; |
| 4747 | goto out_unlock; |
| 4748 | } |
| 4749 | ins_nr = 0; |
| 4750 | if (ret) { |
| 4751 | btrfs_release_path(path); |
| 4752 | continue; |
| 4753 | } |
| 4754 | goto next_slot; |
| 4755 | } |
| 4756 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4757 | src = path->nodes[0]; |
Chris Mason | 31ff1cd | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 4758 | if (ins_nr && ins_start_slot + ins_nr == path->slots[0]) { |
| 4759 | ins_nr++; |
| 4760 | goto next_slot; |
| 4761 | } else if (!ins_nr) { |
| 4762 | ins_start_slot = path->slots[0]; |
| 4763 | ins_nr = 1; |
| 4764 | goto next_slot; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4765 | } |
| 4766 | |
Josef Bacik | 16e7549 | 2013-10-22 12:18:51 -0400 | [diff] [blame] | 4767 | ret = copy_items(trans, inode, dst_path, path, &last_extent, |
Filipe Manana | 1a4bcf4 | 2015-02-13 12:30:56 +0000 | [diff] [blame] | 4768 | ins_start_slot, ins_nr, inode_only, |
| 4769 | logged_isize); |
Josef Bacik | 16e7549 | 2013-10-22 12:18:51 -0400 | [diff] [blame] | 4770 | if (ret < 0) { |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4771 | err = ret; |
| 4772 | goto out_unlock; |
Rasmus Villemoes | a71db86 | 2014-06-20 21:51:43 +0200 | [diff] [blame] | 4773 | } |
| 4774 | if (ret) { |
Josef Bacik | 16e7549 | 2013-10-22 12:18:51 -0400 | [diff] [blame] | 4775 | ins_nr = 0; |
| 4776 | btrfs_release_path(path); |
| 4777 | continue; |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4778 | } |
Chris Mason | 31ff1cd | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 4779 | ins_nr = 1; |
| 4780 | ins_start_slot = path->slots[0]; |
| 4781 | next_slot: |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4782 | |
Chris Mason | 3a5f1d4 | 2008-09-11 15:53:37 -0400 | [diff] [blame] | 4783 | nritems = btrfs_header_nritems(path->nodes[0]); |
| 4784 | path->slots[0]++; |
| 4785 | if (path->slots[0] < nritems) { |
| 4786 | btrfs_item_key_to_cpu(path->nodes[0], &min_key, |
| 4787 | path->slots[0]); |
| 4788 | goto again; |
| 4789 | } |
Chris Mason | 31ff1cd | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 4790 | if (ins_nr) { |
Josef Bacik | 16e7549 | 2013-10-22 12:18:51 -0400 | [diff] [blame] | 4791 | ret = copy_items(trans, inode, dst_path, path, |
| 4792 | &last_extent, ins_start_slot, |
Filipe Manana | 1a4bcf4 | 2015-02-13 12:30:56 +0000 | [diff] [blame] | 4793 | ins_nr, inode_only, logged_isize); |
Josef Bacik | 16e7549 | 2013-10-22 12:18:51 -0400 | [diff] [blame] | 4794 | if (ret < 0) { |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4795 | err = ret; |
| 4796 | goto out_unlock; |
| 4797 | } |
Josef Bacik | 16e7549 | 2013-10-22 12:18:51 -0400 | [diff] [blame] | 4798 | ret = 0; |
Chris Mason | 31ff1cd | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 4799 | ins_nr = 0; |
| 4800 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 4801 | btrfs_release_path(path); |
Chris Mason | 3a5f1d4 | 2008-09-11 15:53:37 -0400 | [diff] [blame] | 4802 | |
Filipe David Borba Manana | 3d41d70 | 2013-10-01 17:06:53 +0100 | [diff] [blame] | 4803 | if (min_key.offset < (u64)-1) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4804 | min_key.offset++; |
Filipe David Borba Manana | 3d41d70 | 2013-10-01 17:06:53 +0100 | [diff] [blame] | 4805 | } else if (min_key.type < max_key.type) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4806 | min_key.type++; |
Filipe David Borba Manana | 3d41d70 | 2013-10-01 17:06:53 +0100 | [diff] [blame] | 4807 | min_key.offset = 0; |
| 4808 | } else { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4809 | break; |
Filipe David Borba Manana | 3d41d70 | 2013-10-01 17:06:53 +0100 | [diff] [blame] | 4810 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4811 | } |
Chris Mason | 31ff1cd | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 4812 | if (ins_nr) { |
Josef Bacik | 16e7549 | 2013-10-22 12:18:51 -0400 | [diff] [blame] | 4813 | ret = copy_items(trans, inode, dst_path, path, &last_extent, |
Filipe Manana | 1a4bcf4 | 2015-02-13 12:30:56 +0000 | [diff] [blame] | 4814 | ins_start_slot, ins_nr, inode_only, |
| 4815 | logged_isize); |
Josef Bacik | 16e7549 | 2013-10-22 12:18:51 -0400 | [diff] [blame] | 4816 | if (ret < 0) { |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4817 | err = ret; |
| 4818 | goto out_unlock; |
| 4819 | } |
Josef Bacik | 16e7549 | 2013-10-22 12:18:51 -0400 | [diff] [blame] | 4820 | ret = 0; |
Chris Mason | 31ff1cd | 2008-09-11 16:17:57 -0400 | [diff] [blame] | 4821 | ins_nr = 0; |
| 4822 | } |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 4823 | |
Filipe Manana | 36283bf | 2015-06-20 00:44:51 +0100 | [diff] [blame] | 4824 | btrfs_release_path(path); |
| 4825 | btrfs_release_path(dst_path); |
| 4826 | err = btrfs_log_all_xattrs(trans, root, inode, path, dst_path); |
| 4827 | if (err) |
| 4828 | goto out_unlock; |
Filipe Manana | a89ca6f | 2015-06-25 04:17:46 +0100 | [diff] [blame] | 4829 | if (max_key.type >= BTRFS_EXTENT_DATA_KEY && !fast_search) { |
| 4830 | btrfs_release_path(path); |
| 4831 | btrfs_release_path(dst_path); |
| 4832 | err = btrfs_log_trailing_hole(trans, root, inode, path); |
| 4833 | if (err) |
| 4834 | goto out_unlock; |
| 4835 | } |
Josef Bacik | a95249b | 2012-10-11 16:17:34 -0400 | [diff] [blame] | 4836 | log_extents: |
Josef Bacik | f3b15cc | 2013-07-22 12:54:30 -0400 | [diff] [blame] | 4837 | btrfs_release_path(path); |
| 4838 | btrfs_release_path(dst_path); |
Filipe Manana | e4545de | 2015-06-17 12:49:23 +0100 | [diff] [blame] | 4839 | if (need_log_inode_item) { |
| 4840 | err = log_inode_item(trans, log, dst_path, inode); |
| 4841 | if (err) |
| 4842 | goto out_unlock; |
| 4843 | } |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 4844 | if (fast_search) { |
Miao Xie | 827463c | 2014-01-14 20:31:51 +0800 | [diff] [blame] | 4845 | ret = btrfs_log_changed_extents(trans, root, inode, dst_path, |
Filipe Manana | de0ee0e | 2016-01-21 10:17:54 +0000 | [diff] [blame] | 4846 | &logged_list, ctx, start, end); |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 4847 | if (ret) { |
| 4848 | err = ret; |
| 4849 | goto out_unlock; |
| 4850 | } |
Josef Bacik | d006a04 | 2013-11-12 20:54:09 -0500 | [diff] [blame] | 4851 | } else if (inode_only == LOG_INODE_ALL) { |
Liu Bo | 06d3d22 | 2012-08-27 10:52:19 -0600 | [diff] [blame] | 4852 | struct extent_map *em, *n; |
| 4853 | |
Filipe Manana | 49dae1b | 2014-09-06 22:34:39 +0100 | [diff] [blame] | 4854 | write_lock(&em_tree->lock); |
| 4855 | /* |
| 4856 | * We can't just remove every em if we're called for a ranged |
| 4857 | * fsync - that is, one that doesn't cover the whole possible |
| 4858 | * file range (0 to LLONG_MAX). This is because we can have |
| 4859 | * em's that fall outside the range we're logging and therefore |
| 4860 | * their ordered operations haven't completed yet |
| 4861 | * (btrfs_finish_ordered_io() not invoked yet). This means we |
| 4862 | * didn't get their respective file extent item in the fs/subvol |
| 4863 | * tree yet, and need to let the next fast fsync (one which |
| 4864 | * consults the list of modified extent maps) find the em so |
| 4865 | * that it logs a matching file extent item and waits for the |
| 4866 | * respective ordered operation to complete (if it's still |
| 4867 | * running). |
| 4868 | * |
| 4869 | * Removing every em outside the range we're logging would make |
| 4870 | * the next fast fsync not log their matching file extent items, |
| 4871 | * therefore making us lose data after a log replay. |
| 4872 | */ |
| 4873 | list_for_each_entry_safe(em, n, &em_tree->modified_extents, |
| 4874 | list) { |
| 4875 | const u64 mod_end = em->mod_start + em->mod_len - 1; |
| 4876 | |
| 4877 | if (em->mod_start >= start && mod_end <= end) |
| 4878 | list_del_init(&em->list); |
| 4879 | } |
| 4880 | write_unlock(&em_tree->lock); |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 4881 | } |
| 4882 | |
Chris Mason | 9623f9a | 2008-09-11 17:42:42 -0400 | [diff] [blame] | 4883 | if (inode_only == LOG_INODE_ALL && S_ISDIR(inode->i_mode)) { |
Filipe Manana | 2f2ff0e | 2015-03-20 17:19:46 +0000 | [diff] [blame] | 4884 | ret = log_directory_changes(trans, root, inode, path, dst_path, |
| 4885 | ctx); |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4886 | if (ret) { |
| 4887 | err = ret; |
| 4888 | goto out_unlock; |
| 4889 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4890 | } |
Filipe Manana | 49dae1b | 2014-09-06 22:34:39 +0100 | [diff] [blame] | 4891 | |
Filipe Manana | 2f2ff0e | 2015-03-20 17:19:46 +0000 | [diff] [blame] | 4892 | spin_lock(&BTRFS_I(inode)->lock); |
Filipe Manana | 125c4cf9 | 2014-09-11 21:22:14 +0100 | [diff] [blame] | 4893 | BTRFS_I(inode)->logged_trans = trans->transid; |
| 4894 | BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->last_sub_trans; |
Filipe Manana | 2f2ff0e | 2015-03-20 17:19:46 +0000 | [diff] [blame] | 4895 | spin_unlock(&BTRFS_I(inode)->lock); |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4896 | out_unlock: |
Miao Xie | 827463c | 2014-01-14 20:31:51 +0800 | [diff] [blame] | 4897 | if (unlikely(err)) |
| 4898 | btrfs_put_logged_extents(&logged_list); |
| 4899 | else |
| 4900 | btrfs_submit_logged_extents(&logged_list, log); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4901 | mutex_unlock(&BTRFS_I(inode)->log_mutex); |
| 4902 | |
| 4903 | btrfs_free_path(path); |
| 4904 | btrfs_free_path(dst_path); |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 4905 | return err; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4906 | } |
| 4907 | |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 4908 | /* |
Filipe Manana | 2be63d5 | 2016-02-12 11:34:23 +0000 | [diff] [blame] | 4909 | * Check if we must fallback to a transaction commit when logging an inode. |
| 4910 | * This must be called after logging the inode and is used only in the context |
| 4911 | * when fsyncing an inode requires the need to log some other inode - in which |
| 4912 | * case we can't lock the i_mutex of each other inode we need to log as that |
| 4913 | * can lead to deadlocks with concurrent fsync against other inodes (as we can |
| 4914 | * log inodes up or down in the hierarchy) or rename operations for example. So |
| 4915 | * we take the log_mutex of the inode after we have logged it and then check for |
| 4916 | * its last_unlink_trans value - this is safe because any task setting |
| 4917 | * last_unlink_trans must take the log_mutex and it must do this before it does |
| 4918 | * the actual unlink operation, so if we do this check before a concurrent task |
| 4919 | * sets last_unlink_trans it means we've logged a consistent version/state of |
| 4920 | * all the inode items, otherwise we are not sure and must do a transaction |
Nicholas D Steeves | 0132761 | 2016-05-19 21:18:45 -0400 | [diff] [blame] | 4921 | * commit (the concurrent task might have only updated last_unlink_trans before |
Filipe Manana | 2be63d5 | 2016-02-12 11:34:23 +0000 | [diff] [blame] | 4922 | * we logged the inode or it might have also done the unlink). |
| 4923 | */ |
| 4924 | static bool btrfs_must_commit_transaction(struct btrfs_trans_handle *trans, |
| 4925 | struct inode *inode) |
| 4926 | { |
| 4927 | struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; |
| 4928 | bool ret = false; |
| 4929 | |
| 4930 | mutex_lock(&BTRFS_I(inode)->log_mutex); |
| 4931 | if (BTRFS_I(inode)->last_unlink_trans > fs_info->last_trans_committed) { |
| 4932 | /* |
| 4933 | * Make sure any commits to the log are forced to be full |
| 4934 | * commits. |
| 4935 | */ |
| 4936 | btrfs_set_log_full_commit(fs_info, trans); |
| 4937 | ret = true; |
| 4938 | } |
| 4939 | mutex_unlock(&BTRFS_I(inode)->log_mutex); |
| 4940 | |
| 4941 | return ret; |
| 4942 | } |
| 4943 | |
| 4944 | /* |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 4945 | * follow the dentry parent pointers up the chain and see if any |
| 4946 | * of the directories in it require a full commit before they can |
| 4947 | * be logged. Returns zero if nothing special needs to be done or 1 if |
| 4948 | * a full commit is required. |
| 4949 | */ |
| 4950 | static noinline int check_parent_dirs_for_sync(struct btrfs_trans_handle *trans, |
| 4951 | struct inode *inode, |
| 4952 | struct dentry *parent, |
| 4953 | struct super_block *sb, |
| 4954 | u64 last_committed) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4955 | { |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 4956 | int ret = 0; |
Josef Bacik | 6a91221 | 2010-11-20 09:48:00 +0000 | [diff] [blame] | 4957 | struct dentry *old_parent = NULL; |
Josef Bacik | de2b530 | 2013-09-11 09:36:30 -0400 | [diff] [blame] | 4958 | struct inode *orig_inode = inode; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4959 | |
Chris Mason | af4176b | 2009-03-24 10:24:31 -0400 | [diff] [blame] | 4960 | /* |
| 4961 | * for regular files, if its inode is already on disk, we don't |
| 4962 | * have to worry about the parents at all. This is because |
| 4963 | * we can use the last_unlink_trans field to record renames |
| 4964 | * and other fun in this file. |
| 4965 | */ |
| 4966 | if (S_ISREG(inode->i_mode) && |
| 4967 | BTRFS_I(inode)->generation <= last_committed && |
| 4968 | BTRFS_I(inode)->last_unlink_trans <= last_committed) |
| 4969 | goto out; |
| 4970 | |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 4971 | if (!S_ISDIR(inode->i_mode)) { |
Al Viro | fc64005 | 2016-04-10 01:33:30 -0400 | [diff] [blame] | 4972 | if (!parent || d_really_is_negative(parent) || sb != parent->d_sb) |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 4973 | goto out; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 4974 | inode = d_inode(parent); |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 4975 | } |
| 4976 | |
| 4977 | while (1) { |
Josef Bacik | de2b530 | 2013-09-11 09:36:30 -0400 | [diff] [blame] | 4978 | /* |
| 4979 | * If we are logging a directory then we start with our inode, |
Nicholas D Steeves | 0132761 | 2016-05-19 21:18:45 -0400 | [diff] [blame] | 4980 | * not our parent's inode, so we need to skip setting the |
Josef Bacik | de2b530 | 2013-09-11 09:36:30 -0400 | [diff] [blame] | 4981 | * logged_trans so that further down in the log code we don't |
| 4982 | * think this inode has already been logged. |
| 4983 | */ |
| 4984 | if (inode != orig_inode) |
| 4985 | BTRFS_I(inode)->logged_trans = trans->transid; |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 4986 | smp_mb(); |
| 4987 | |
Filipe Manana | 2be63d5 | 2016-02-12 11:34:23 +0000 | [diff] [blame] | 4988 | if (btrfs_must_commit_transaction(trans, inode)) { |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 4989 | ret = 1; |
| 4990 | break; |
| 4991 | } |
| 4992 | |
Al Viro | fc64005 | 2016-04-10 01:33:30 -0400 | [diff] [blame] | 4993 | if (!parent || d_really_is_negative(parent) || sb != parent->d_sb) |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 4994 | break; |
| 4995 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 4996 | if (IS_ROOT(parent)) |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 4997 | break; |
| 4998 | |
Josef Bacik | 6a91221 | 2010-11-20 09:48:00 +0000 | [diff] [blame] | 4999 | parent = dget_parent(parent); |
| 5000 | dput(old_parent); |
| 5001 | old_parent = parent; |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 5002 | inode = d_inode(parent); |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 5003 | |
| 5004 | } |
Josef Bacik | 6a91221 | 2010-11-20 09:48:00 +0000 | [diff] [blame] | 5005 | dput(old_parent); |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 5006 | out: |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5007 | return ret; |
| 5008 | } |
| 5009 | |
Filipe Manana | 2f2ff0e | 2015-03-20 17:19:46 +0000 | [diff] [blame] | 5010 | struct btrfs_dir_list { |
| 5011 | u64 ino; |
| 5012 | struct list_head list; |
| 5013 | }; |
| 5014 | |
| 5015 | /* |
| 5016 | * Log the inodes of the new dentries of a directory. See log_dir_items() for |
| 5017 | * details about the why it is needed. |
| 5018 | * This is a recursive operation - if an existing dentry corresponds to a |
| 5019 | * directory, that directory's new entries are logged too (same behaviour as |
| 5020 | * ext3/4, xfs, f2fs, reiserfs, nilfs2). Note that when logging the inodes |
| 5021 | * the dentries point to we do not lock their i_mutex, otherwise lockdep |
| 5022 | * complains about the following circular lock dependency / possible deadlock: |
| 5023 | * |
| 5024 | * CPU0 CPU1 |
| 5025 | * ---- ---- |
| 5026 | * lock(&type->i_mutex_dir_key#3/2); |
| 5027 | * lock(sb_internal#2); |
| 5028 | * lock(&type->i_mutex_dir_key#3/2); |
| 5029 | * lock(&sb->s_type->i_mutex_key#14); |
| 5030 | * |
| 5031 | * Where sb_internal is the lock (a counter that works as a lock) acquired by |
| 5032 | * sb_start_intwrite() in btrfs_start_transaction(). |
| 5033 | * Not locking i_mutex of the inodes is still safe because: |
| 5034 | * |
| 5035 | * 1) For regular files we log with a mode of LOG_INODE_EXISTS. It's possible |
| 5036 | * that while logging the inode new references (names) are added or removed |
| 5037 | * from the inode, leaving the logged inode item with a link count that does |
| 5038 | * not match the number of logged inode reference items. This is fine because |
| 5039 | * at log replay time we compute the real number of links and correct the |
| 5040 | * link count in the inode item (see replay_one_buffer() and |
| 5041 | * link_to_fixup_dir()); |
| 5042 | * |
| 5043 | * 2) For directories we log with a mode of LOG_INODE_ALL. It's possible that |
| 5044 | * while logging the inode's items new items with keys BTRFS_DIR_ITEM_KEY and |
| 5045 | * BTRFS_DIR_INDEX_KEY are added to fs/subvol tree and the logged inode item |
| 5046 | * has a size that doesn't match the sum of the lengths of all the logged |
| 5047 | * names. This does not result in a problem because if a dir_item key is |
| 5048 | * logged but its matching dir_index key is not logged, at log replay time we |
| 5049 | * don't use it to replay the respective name (see replay_one_name()). On the |
| 5050 | * other hand if only the dir_index key ends up being logged, the respective |
| 5051 | * name is added to the fs/subvol tree with both the dir_item and dir_index |
| 5052 | * keys created (see replay_one_name()). |
| 5053 | * The directory's inode item with a wrong i_size is not a problem as well, |
| 5054 | * since we don't use it at log replay time to set the i_size in the inode |
| 5055 | * item of the fs/subvol tree (see overwrite_item()). |
| 5056 | */ |
| 5057 | static int log_new_dir_dentries(struct btrfs_trans_handle *trans, |
| 5058 | struct btrfs_root *root, |
| 5059 | struct inode *start_inode, |
| 5060 | struct btrfs_log_ctx *ctx) |
| 5061 | { |
| 5062 | struct btrfs_root *log = root->log_root; |
| 5063 | struct btrfs_path *path; |
| 5064 | LIST_HEAD(dir_list); |
| 5065 | struct btrfs_dir_list *dir_elem; |
| 5066 | int ret = 0; |
| 5067 | |
| 5068 | path = btrfs_alloc_path(); |
| 5069 | if (!path) |
| 5070 | return -ENOMEM; |
| 5071 | |
| 5072 | dir_elem = kmalloc(sizeof(*dir_elem), GFP_NOFS); |
| 5073 | if (!dir_elem) { |
| 5074 | btrfs_free_path(path); |
| 5075 | return -ENOMEM; |
| 5076 | } |
| 5077 | dir_elem->ino = btrfs_ino(start_inode); |
| 5078 | list_add_tail(&dir_elem->list, &dir_list); |
| 5079 | |
| 5080 | while (!list_empty(&dir_list)) { |
| 5081 | struct extent_buffer *leaf; |
| 5082 | struct btrfs_key min_key; |
| 5083 | int nritems; |
| 5084 | int i; |
| 5085 | |
| 5086 | dir_elem = list_first_entry(&dir_list, struct btrfs_dir_list, |
| 5087 | list); |
| 5088 | if (ret) |
| 5089 | goto next_dir_inode; |
| 5090 | |
| 5091 | min_key.objectid = dir_elem->ino; |
| 5092 | min_key.type = BTRFS_DIR_ITEM_KEY; |
| 5093 | min_key.offset = 0; |
| 5094 | again: |
| 5095 | btrfs_release_path(path); |
| 5096 | ret = btrfs_search_forward(log, &min_key, path, trans->transid); |
| 5097 | if (ret < 0) { |
| 5098 | goto next_dir_inode; |
| 5099 | } else if (ret > 0) { |
| 5100 | ret = 0; |
| 5101 | goto next_dir_inode; |
| 5102 | } |
| 5103 | |
| 5104 | process_leaf: |
| 5105 | leaf = path->nodes[0]; |
| 5106 | nritems = btrfs_header_nritems(leaf); |
| 5107 | for (i = path->slots[0]; i < nritems; i++) { |
| 5108 | struct btrfs_dir_item *di; |
| 5109 | struct btrfs_key di_key; |
| 5110 | struct inode *di_inode; |
| 5111 | struct btrfs_dir_list *new_dir_elem; |
| 5112 | int log_mode = LOG_INODE_EXISTS; |
| 5113 | int type; |
| 5114 | |
| 5115 | btrfs_item_key_to_cpu(leaf, &min_key, i); |
| 5116 | if (min_key.objectid != dir_elem->ino || |
| 5117 | min_key.type != BTRFS_DIR_ITEM_KEY) |
| 5118 | goto next_dir_inode; |
| 5119 | |
| 5120 | di = btrfs_item_ptr(leaf, i, struct btrfs_dir_item); |
| 5121 | type = btrfs_dir_type(leaf, di); |
| 5122 | if (btrfs_dir_transid(leaf, di) < trans->transid && |
| 5123 | type != BTRFS_FT_DIR) |
| 5124 | continue; |
| 5125 | btrfs_dir_item_key_to_cpu(leaf, di, &di_key); |
| 5126 | if (di_key.type == BTRFS_ROOT_ITEM_KEY) |
| 5127 | continue; |
| 5128 | |
| 5129 | di_inode = btrfs_iget(root->fs_info->sb, &di_key, |
| 5130 | root, NULL); |
| 5131 | if (IS_ERR(di_inode)) { |
| 5132 | ret = PTR_ERR(di_inode); |
| 5133 | goto next_dir_inode; |
| 5134 | } |
| 5135 | |
| 5136 | if (btrfs_inode_in_log(di_inode, trans->transid)) { |
| 5137 | iput(di_inode); |
| 5138 | continue; |
| 5139 | } |
| 5140 | |
| 5141 | ctx->log_new_dentries = false; |
Filipe Manana | 3f9749f | 2016-04-25 04:45:02 +0100 | [diff] [blame] | 5142 | if (type == BTRFS_FT_DIR || type == BTRFS_FT_SYMLINK) |
Filipe Manana | 2f2ff0e | 2015-03-20 17:19:46 +0000 | [diff] [blame] | 5143 | log_mode = LOG_INODE_ALL; |
| 5144 | btrfs_release_path(path); |
| 5145 | ret = btrfs_log_inode(trans, root, di_inode, |
| 5146 | log_mode, 0, LLONG_MAX, ctx); |
Filipe Manana | 2be63d5 | 2016-02-12 11:34:23 +0000 | [diff] [blame] | 5147 | if (!ret && |
| 5148 | btrfs_must_commit_transaction(trans, di_inode)) |
| 5149 | ret = 1; |
Filipe Manana | 2f2ff0e | 2015-03-20 17:19:46 +0000 | [diff] [blame] | 5150 | iput(di_inode); |
| 5151 | if (ret) |
| 5152 | goto next_dir_inode; |
| 5153 | if (ctx->log_new_dentries) { |
| 5154 | new_dir_elem = kmalloc(sizeof(*new_dir_elem), |
| 5155 | GFP_NOFS); |
| 5156 | if (!new_dir_elem) { |
| 5157 | ret = -ENOMEM; |
| 5158 | goto next_dir_inode; |
| 5159 | } |
| 5160 | new_dir_elem->ino = di_key.objectid; |
| 5161 | list_add_tail(&new_dir_elem->list, &dir_list); |
| 5162 | } |
| 5163 | break; |
| 5164 | } |
| 5165 | if (i == nritems) { |
| 5166 | ret = btrfs_next_leaf(log, path); |
| 5167 | if (ret < 0) { |
| 5168 | goto next_dir_inode; |
| 5169 | } else if (ret > 0) { |
| 5170 | ret = 0; |
| 5171 | goto next_dir_inode; |
| 5172 | } |
| 5173 | goto process_leaf; |
| 5174 | } |
| 5175 | if (min_key.offset < (u64)-1) { |
| 5176 | min_key.offset++; |
| 5177 | goto again; |
| 5178 | } |
| 5179 | next_dir_inode: |
| 5180 | list_del(&dir_elem->list); |
| 5181 | kfree(dir_elem); |
| 5182 | } |
| 5183 | |
| 5184 | btrfs_free_path(path); |
| 5185 | return ret; |
| 5186 | } |
| 5187 | |
Filipe Manana | 18aa092 | 2015-08-05 16:49:08 +0100 | [diff] [blame] | 5188 | static int btrfs_log_all_parents(struct btrfs_trans_handle *trans, |
| 5189 | struct inode *inode, |
| 5190 | struct btrfs_log_ctx *ctx) |
| 5191 | { |
| 5192 | int ret; |
| 5193 | struct btrfs_path *path; |
| 5194 | struct btrfs_key key; |
| 5195 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 5196 | const u64 ino = btrfs_ino(inode); |
| 5197 | |
| 5198 | path = btrfs_alloc_path(); |
| 5199 | if (!path) |
| 5200 | return -ENOMEM; |
| 5201 | path->skip_locking = 1; |
| 5202 | path->search_commit_root = 1; |
| 5203 | |
| 5204 | key.objectid = ino; |
| 5205 | key.type = BTRFS_INODE_REF_KEY; |
| 5206 | key.offset = 0; |
| 5207 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 5208 | if (ret < 0) |
| 5209 | goto out; |
| 5210 | |
| 5211 | while (true) { |
| 5212 | struct extent_buffer *leaf = path->nodes[0]; |
| 5213 | int slot = path->slots[0]; |
| 5214 | u32 cur_offset = 0; |
| 5215 | u32 item_size; |
| 5216 | unsigned long ptr; |
| 5217 | |
| 5218 | if (slot >= btrfs_header_nritems(leaf)) { |
| 5219 | ret = btrfs_next_leaf(root, path); |
| 5220 | if (ret < 0) |
| 5221 | goto out; |
| 5222 | else if (ret > 0) |
| 5223 | break; |
| 5224 | continue; |
| 5225 | } |
| 5226 | |
| 5227 | btrfs_item_key_to_cpu(leaf, &key, slot); |
| 5228 | /* BTRFS_INODE_EXTREF_KEY is BTRFS_INODE_REF_KEY + 1 */ |
| 5229 | if (key.objectid != ino || key.type > BTRFS_INODE_EXTREF_KEY) |
| 5230 | break; |
| 5231 | |
| 5232 | item_size = btrfs_item_size_nr(leaf, slot); |
| 5233 | ptr = btrfs_item_ptr_offset(leaf, slot); |
| 5234 | while (cur_offset < item_size) { |
| 5235 | struct btrfs_key inode_key; |
| 5236 | struct inode *dir_inode; |
| 5237 | |
| 5238 | inode_key.type = BTRFS_INODE_ITEM_KEY; |
| 5239 | inode_key.offset = 0; |
| 5240 | |
| 5241 | if (key.type == BTRFS_INODE_EXTREF_KEY) { |
| 5242 | struct btrfs_inode_extref *extref; |
| 5243 | |
| 5244 | extref = (struct btrfs_inode_extref *) |
| 5245 | (ptr + cur_offset); |
| 5246 | inode_key.objectid = btrfs_inode_extref_parent( |
| 5247 | leaf, extref); |
| 5248 | cur_offset += sizeof(*extref); |
| 5249 | cur_offset += btrfs_inode_extref_name_len(leaf, |
| 5250 | extref); |
| 5251 | } else { |
| 5252 | inode_key.objectid = key.offset; |
| 5253 | cur_offset = item_size; |
| 5254 | } |
| 5255 | |
| 5256 | dir_inode = btrfs_iget(root->fs_info->sb, &inode_key, |
| 5257 | root, NULL); |
| 5258 | /* If parent inode was deleted, skip it. */ |
| 5259 | if (IS_ERR(dir_inode)) |
| 5260 | continue; |
| 5261 | |
Filipe Manana | 657ed1a | 2016-04-06 17:11:56 +0100 | [diff] [blame] | 5262 | if (ctx) |
| 5263 | ctx->log_new_dentries = false; |
Filipe Manana | 18aa092 | 2015-08-05 16:49:08 +0100 | [diff] [blame] | 5264 | ret = btrfs_log_inode(trans, root, dir_inode, |
| 5265 | LOG_INODE_ALL, 0, LLONG_MAX, ctx); |
Filipe Manana | 2be63d5 | 2016-02-12 11:34:23 +0000 | [diff] [blame] | 5266 | if (!ret && |
| 5267 | btrfs_must_commit_transaction(trans, dir_inode)) |
| 5268 | ret = 1; |
Filipe Manana | 657ed1a | 2016-04-06 17:11:56 +0100 | [diff] [blame] | 5269 | if (!ret && ctx && ctx->log_new_dentries) |
| 5270 | ret = log_new_dir_dentries(trans, root, |
| 5271 | dir_inode, ctx); |
Filipe Manana | 18aa092 | 2015-08-05 16:49:08 +0100 | [diff] [blame] | 5272 | iput(dir_inode); |
| 5273 | if (ret) |
| 5274 | goto out; |
| 5275 | } |
| 5276 | path->slots[0]++; |
| 5277 | } |
| 5278 | ret = 0; |
| 5279 | out: |
| 5280 | btrfs_free_path(path); |
| 5281 | return ret; |
| 5282 | } |
| 5283 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5284 | /* |
| 5285 | * helper function around btrfs_log_inode to make sure newly created |
| 5286 | * parent directories also end up in the log. A minimal inode and backref |
| 5287 | * only logging is done of any parent directories that are older than |
| 5288 | * the last committed transaction |
| 5289 | */ |
Eric Sandeen | 48a3b63 | 2013-04-25 20:41:01 +0000 | [diff] [blame] | 5290 | static int btrfs_log_inode_parent(struct btrfs_trans_handle *trans, |
| 5291 | struct btrfs_root *root, struct inode *inode, |
Filipe Manana | 49dae1b | 2014-09-06 22:34:39 +0100 | [diff] [blame] | 5292 | struct dentry *parent, |
| 5293 | const loff_t start, |
| 5294 | const loff_t end, |
| 5295 | int exists_only, |
Miao Xie | 8b050d3 | 2014-02-20 18:08:58 +0800 | [diff] [blame] | 5296 | struct btrfs_log_ctx *ctx) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5297 | { |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 5298 | int inode_only = exists_only ? LOG_INODE_EXISTS : LOG_INODE_ALL; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5299 | struct super_block *sb; |
Josef Bacik | 6a91221 | 2010-11-20 09:48:00 +0000 | [diff] [blame] | 5300 | struct dentry *old_parent = NULL; |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 5301 | int ret = 0; |
| 5302 | u64 last_committed = root->fs_info->last_trans_committed; |
Filipe Manana | 2f2ff0e | 2015-03-20 17:19:46 +0000 | [diff] [blame] | 5303 | bool log_dentries = false; |
| 5304 | struct inode *orig_inode = inode; |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 5305 | |
| 5306 | sb = inode->i_sb; |
| 5307 | |
Jeff Mahoney | 3cdde22 | 2016-06-09 21:38:35 -0400 | [diff] [blame] | 5308 | if (btrfs_test_opt(root->fs_info, NOTREELOG)) { |
Sage Weil | 3a5e140 | 2009-04-02 16:49:40 -0400 | [diff] [blame] | 5309 | ret = 1; |
| 5310 | goto end_no_trans; |
| 5311 | } |
| 5312 | |
Miao Xie | 995946d | 2014-04-02 19:51:06 +0800 | [diff] [blame] | 5313 | /* |
| 5314 | * The prev transaction commit doesn't complete, we need do |
| 5315 | * full commit by ourselves. |
| 5316 | */ |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 5317 | if (root->fs_info->last_trans_log_full_commit > |
| 5318 | root->fs_info->last_trans_committed) { |
| 5319 | ret = 1; |
| 5320 | goto end_no_trans; |
| 5321 | } |
| 5322 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 5323 | if (root != BTRFS_I(inode)->root || |
| 5324 | btrfs_root_refs(&root->root_item) == 0) { |
| 5325 | ret = 1; |
| 5326 | goto end_no_trans; |
| 5327 | } |
| 5328 | |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 5329 | ret = check_parent_dirs_for_sync(trans, inode, parent, |
| 5330 | sb, last_committed); |
| 5331 | if (ret) |
| 5332 | goto end_no_trans; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5333 | |
Josef Bacik | 22ee698 | 2012-05-29 16:57:49 -0400 | [diff] [blame] | 5334 | if (btrfs_inode_in_log(inode, trans->transid)) { |
Chris Mason | 257c62e | 2009-10-13 13:21:08 -0400 | [diff] [blame] | 5335 | ret = BTRFS_NO_LOG_SYNC; |
| 5336 | goto end_no_trans; |
| 5337 | } |
| 5338 | |
Miao Xie | 8b050d3 | 2014-02-20 18:08:58 +0800 | [diff] [blame] | 5339 | ret = start_log_trans(trans, root, ctx); |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 5340 | if (ret) |
Miao Xie | e87ac13 | 2014-02-20 18:08:53 +0800 | [diff] [blame] | 5341 | goto end_no_trans; |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 5342 | |
Filipe Manana | 8407f55 | 2014-09-05 15:14:39 +0100 | [diff] [blame] | 5343 | ret = btrfs_log_inode(trans, root, inode, inode_only, start, end, ctx); |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 5344 | if (ret) |
| 5345 | goto end_trans; |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 5346 | |
Chris Mason | af4176b | 2009-03-24 10:24:31 -0400 | [diff] [blame] | 5347 | /* |
| 5348 | * for regular files, if its inode is already on disk, we don't |
| 5349 | * have to worry about the parents at all. This is because |
| 5350 | * we can use the last_unlink_trans field to record renames |
| 5351 | * and other fun in this file. |
| 5352 | */ |
| 5353 | if (S_ISREG(inode->i_mode) && |
| 5354 | BTRFS_I(inode)->generation <= last_committed && |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 5355 | BTRFS_I(inode)->last_unlink_trans <= last_committed) { |
| 5356 | ret = 0; |
| 5357 | goto end_trans; |
| 5358 | } |
Chris Mason | af4176b | 2009-03-24 10:24:31 -0400 | [diff] [blame] | 5359 | |
Filipe Manana | 2f2ff0e | 2015-03-20 17:19:46 +0000 | [diff] [blame] | 5360 | if (S_ISDIR(inode->i_mode) && ctx && ctx->log_new_dentries) |
| 5361 | log_dentries = true; |
| 5362 | |
Filipe Manana | 18aa092 | 2015-08-05 16:49:08 +0100 | [diff] [blame] | 5363 | /* |
Nicholas D Steeves | 0132761 | 2016-05-19 21:18:45 -0400 | [diff] [blame] | 5364 | * On unlink we must make sure all our current and old parent directory |
Filipe Manana | 18aa092 | 2015-08-05 16:49:08 +0100 | [diff] [blame] | 5365 | * inodes are fully logged. This is to prevent leaving dangling |
| 5366 | * directory index entries in directories that were our parents but are |
| 5367 | * not anymore. Not doing this results in old parent directory being |
| 5368 | * impossible to delete after log replay (rmdir will always fail with |
| 5369 | * error -ENOTEMPTY). |
| 5370 | * |
| 5371 | * Example 1: |
| 5372 | * |
| 5373 | * mkdir testdir |
| 5374 | * touch testdir/foo |
| 5375 | * ln testdir/foo testdir/bar |
| 5376 | * sync |
| 5377 | * unlink testdir/bar |
| 5378 | * xfs_io -c fsync testdir/foo |
| 5379 | * <power failure> |
| 5380 | * mount fs, triggers log replay |
| 5381 | * |
| 5382 | * If we don't log the parent directory (testdir), after log replay the |
| 5383 | * directory still has an entry pointing to the file inode using the bar |
| 5384 | * name, but a matching BTRFS_INODE_[REF|EXTREF]_KEY does not exist and |
| 5385 | * the file inode has a link count of 1. |
| 5386 | * |
| 5387 | * Example 2: |
| 5388 | * |
| 5389 | * mkdir testdir |
| 5390 | * touch foo |
| 5391 | * ln foo testdir/foo2 |
| 5392 | * ln foo testdir/foo3 |
| 5393 | * sync |
| 5394 | * unlink testdir/foo3 |
| 5395 | * xfs_io -c fsync foo |
| 5396 | * <power failure> |
| 5397 | * mount fs, triggers log replay |
| 5398 | * |
| 5399 | * Similar as the first example, after log replay the parent directory |
| 5400 | * testdir still has an entry pointing to the inode file with name foo3 |
| 5401 | * but the file inode does not have a matching BTRFS_INODE_REF_KEY item |
| 5402 | * and has a link count of 2. |
| 5403 | */ |
| 5404 | if (BTRFS_I(inode)->last_unlink_trans > last_committed) { |
| 5405 | ret = btrfs_log_all_parents(trans, orig_inode, ctx); |
| 5406 | if (ret) |
| 5407 | goto end_trans; |
| 5408 | } |
| 5409 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5410 | while (1) { |
Al Viro | fc64005 | 2016-04-10 01:33:30 -0400 | [diff] [blame] | 5411 | if (!parent || d_really_is_negative(parent) || sb != parent->d_sb) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5412 | break; |
| 5413 | |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 5414 | inode = d_inode(parent); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 5415 | if (root != BTRFS_I(inode)->root) |
| 5416 | break; |
| 5417 | |
Filipe Manana | 18aa092 | 2015-08-05 16:49:08 +0100 | [diff] [blame] | 5418 | if (BTRFS_I(inode)->generation > last_committed) { |
| 5419 | ret = btrfs_log_inode(trans, root, inode, |
| 5420 | LOG_INODE_EXISTS, |
Filipe Manana | 8407f55 | 2014-09-05 15:14:39 +0100 | [diff] [blame] | 5421 | 0, LLONG_MAX, ctx); |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 5422 | if (ret) |
| 5423 | goto end_trans; |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 5424 | } |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 5425 | if (IS_ROOT(parent)) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5426 | break; |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 5427 | |
Josef Bacik | 6a91221 | 2010-11-20 09:48:00 +0000 | [diff] [blame] | 5428 | parent = dget_parent(parent); |
| 5429 | dput(old_parent); |
| 5430 | old_parent = parent; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5431 | } |
Filipe Manana | 2f2ff0e | 2015-03-20 17:19:46 +0000 | [diff] [blame] | 5432 | if (log_dentries) |
| 5433 | ret = log_new_dir_dentries(trans, root, orig_inode, ctx); |
| 5434 | else |
| 5435 | ret = 0; |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 5436 | end_trans: |
Josef Bacik | 6a91221 | 2010-11-20 09:48:00 +0000 | [diff] [blame] | 5437 | dput(old_parent); |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 5438 | if (ret < 0) { |
Miao Xie | 995946d | 2014-04-02 19:51:06 +0800 | [diff] [blame] | 5439 | btrfs_set_log_full_commit(root->fs_info, trans); |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 5440 | ret = 1; |
| 5441 | } |
Miao Xie | 8b050d3 | 2014-02-20 18:08:58 +0800 | [diff] [blame] | 5442 | |
| 5443 | if (ret) |
| 5444 | btrfs_remove_log_ctx(root, ctx); |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 5445 | btrfs_end_log_trans(root); |
| 5446 | end_no_trans: |
| 5447 | return ret; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5448 | } |
| 5449 | |
| 5450 | /* |
| 5451 | * it is not safe to log dentry if the chunk root has added new |
| 5452 | * chunks. This returns 0 if the dentry was logged, and 1 otherwise. |
| 5453 | * If this returns 1, you must commit the transaction to safely get your |
| 5454 | * data on disk. |
| 5455 | */ |
| 5456 | int btrfs_log_dentry_safe(struct btrfs_trans_handle *trans, |
Miao Xie | 8b050d3 | 2014-02-20 18:08:58 +0800 | [diff] [blame] | 5457 | struct btrfs_root *root, struct dentry *dentry, |
Filipe Manana | 49dae1b | 2014-09-06 22:34:39 +0100 | [diff] [blame] | 5458 | const loff_t start, |
| 5459 | const loff_t end, |
Miao Xie | 8b050d3 | 2014-02-20 18:08:58 +0800 | [diff] [blame] | 5460 | struct btrfs_log_ctx *ctx) |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5461 | { |
Josef Bacik | 6a91221 | 2010-11-20 09:48:00 +0000 | [diff] [blame] | 5462 | struct dentry *parent = dget_parent(dentry); |
| 5463 | int ret; |
| 5464 | |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 5465 | ret = btrfs_log_inode_parent(trans, root, d_inode(dentry), parent, |
Filipe Manana | 49dae1b | 2014-09-06 22:34:39 +0100 | [diff] [blame] | 5466 | start, end, 0, ctx); |
Josef Bacik | 6a91221 | 2010-11-20 09:48:00 +0000 | [diff] [blame] | 5467 | dput(parent); |
| 5468 | |
| 5469 | return ret; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5470 | } |
| 5471 | |
| 5472 | /* |
| 5473 | * should be called during mount to recover any replay any log trees |
| 5474 | * from the FS |
| 5475 | */ |
| 5476 | int btrfs_recover_log_trees(struct btrfs_root *log_root_tree) |
| 5477 | { |
| 5478 | int ret; |
| 5479 | struct btrfs_path *path; |
| 5480 | struct btrfs_trans_handle *trans; |
| 5481 | struct btrfs_key key; |
| 5482 | struct btrfs_key found_key; |
| 5483 | struct btrfs_key tmp_key; |
| 5484 | struct btrfs_root *log; |
| 5485 | struct btrfs_fs_info *fs_info = log_root_tree->fs_info; |
| 5486 | struct walk_control wc = { |
| 5487 | .process_func = process_one_buffer, |
| 5488 | .stage = 0, |
| 5489 | }; |
| 5490 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5491 | path = btrfs_alloc_path(); |
Tsutomu Itoh | db5b493 | 2011-03-23 08:14:16 +0000 | [diff] [blame] | 5492 | if (!path) |
| 5493 | return -ENOMEM; |
| 5494 | |
| 5495 | fs_info->log_root_recovering = 1; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5496 | |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 5497 | trans = btrfs_start_transaction(fs_info->tree_root, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5498 | if (IS_ERR(trans)) { |
| 5499 | ret = PTR_ERR(trans); |
| 5500 | goto error; |
| 5501 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5502 | |
| 5503 | wc.trans = trans; |
| 5504 | wc.pin = 1; |
| 5505 | |
Tsutomu Itoh | db5b493 | 2011-03-23 08:14:16 +0000 | [diff] [blame] | 5506 | ret = walk_log_tree(trans, log_root_tree, &wc); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5507 | if (ret) { |
Anand Jain | 34d9700 | 2016-03-16 16:43:06 +0800 | [diff] [blame] | 5508 | btrfs_handle_fs_error(fs_info, ret, "Failed to pin buffers while " |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5509 | "recovering log root tree."); |
| 5510 | goto error; |
| 5511 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5512 | |
| 5513 | again: |
| 5514 | key.objectid = BTRFS_TREE_LOG_OBJECTID; |
| 5515 | key.offset = (u64)-1; |
David Sterba | 962a298 | 2014-06-04 18:41:45 +0200 | [diff] [blame] | 5516 | key.type = BTRFS_ROOT_ITEM_KEY; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5517 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5518 | while (1) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5519 | ret = btrfs_search_slot(NULL, log_root_tree, &key, path, 0, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5520 | |
| 5521 | if (ret < 0) { |
Anand Jain | 34d9700 | 2016-03-16 16:43:06 +0800 | [diff] [blame] | 5522 | btrfs_handle_fs_error(fs_info, ret, |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5523 | "Couldn't find tree log root."); |
| 5524 | goto error; |
| 5525 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5526 | if (ret > 0) { |
| 5527 | if (path->slots[0] == 0) |
| 5528 | break; |
| 5529 | path->slots[0]--; |
| 5530 | } |
| 5531 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, |
| 5532 | path->slots[0]); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 5533 | btrfs_release_path(path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5534 | if (found_key.objectid != BTRFS_TREE_LOG_OBJECTID) |
| 5535 | break; |
| 5536 | |
Miao Xie | cb517ea | 2013-05-15 07:48:19 +0000 | [diff] [blame] | 5537 | log = btrfs_read_fs_root(log_root_tree, &found_key); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5538 | if (IS_ERR(log)) { |
| 5539 | ret = PTR_ERR(log); |
Anand Jain | 34d9700 | 2016-03-16 16:43:06 +0800 | [diff] [blame] | 5540 | btrfs_handle_fs_error(fs_info, ret, |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5541 | "Couldn't read tree log root."); |
| 5542 | goto error; |
| 5543 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5544 | |
| 5545 | tmp_key.objectid = found_key.offset; |
| 5546 | tmp_key.type = BTRFS_ROOT_ITEM_KEY; |
| 5547 | tmp_key.offset = (u64)-1; |
| 5548 | |
| 5549 | wc.replay_dest = btrfs_read_fs_root_no_name(fs_info, &tmp_key); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5550 | if (IS_ERR(wc.replay_dest)) { |
| 5551 | ret = PTR_ERR(wc.replay_dest); |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 5552 | free_extent_buffer(log->node); |
| 5553 | free_extent_buffer(log->commit_root); |
| 5554 | kfree(log); |
Anand Jain | 34d9700 | 2016-03-16 16:43:06 +0800 | [diff] [blame] | 5555 | btrfs_handle_fs_error(fs_info, ret, "Couldn't read target root " |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5556 | "for tree log recovery."); |
| 5557 | goto error; |
| 5558 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5559 | |
Yan Zheng | 07d400a | 2009-01-06 11:42:00 -0500 | [diff] [blame] | 5560 | wc.replay_dest->log_root = log; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 5561 | btrfs_record_root_in_trans(trans, wc.replay_dest); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5562 | ret = walk_log_tree(trans, log, &wc); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5563 | |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 5564 | if (!ret && wc.stage == LOG_WALK_REPLAY_ALL) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5565 | ret = fixup_inode_link_counts(trans, wc.replay_dest, |
| 5566 | path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5567 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5568 | |
| 5569 | key.offset = found_key.offset - 1; |
Yan Zheng | 07d400a | 2009-01-06 11:42:00 -0500 | [diff] [blame] | 5570 | wc.replay_dest->log_root = NULL; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5571 | free_extent_buffer(log->node); |
Chris Mason | b263c2c | 2009-06-11 11:24:47 -0400 | [diff] [blame] | 5572 | free_extent_buffer(log->commit_root); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5573 | kfree(log); |
| 5574 | |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 5575 | if (ret) |
| 5576 | goto error; |
| 5577 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5578 | if (found_key.offset == 0) |
| 5579 | break; |
| 5580 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 5581 | btrfs_release_path(path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5582 | |
| 5583 | /* step one is to pin it all, step two is to replay just inodes */ |
| 5584 | if (wc.pin) { |
| 5585 | wc.pin = 0; |
| 5586 | wc.process_func = replay_one_buffer; |
| 5587 | wc.stage = LOG_WALK_REPLAY_INODES; |
| 5588 | goto again; |
| 5589 | } |
| 5590 | /* step three is to replay everything */ |
| 5591 | if (wc.stage < LOG_WALK_REPLAY_ALL) { |
| 5592 | wc.stage++; |
| 5593 | goto again; |
| 5594 | } |
| 5595 | |
| 5596 | btrfs_free_path(path); |
| 5597 | |
Josef Bacik | abefa55 | 2013-04-24 16:40:05 -0400 | [diff] [blame] | 5598 | /* step 4: commit the transaction, which also unpins the blocks */ |
| 5599 | ret = btrfs_commit_transaction(trans, fs_info->tree_root); |
| 5600 | if (ret) |
| 5601 | return ret; |
| 5602 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5603 | free_extent_buffer(log_root_tree->node); |
| 5604 | log_root_tree->log_root = NULL; |
| 5605 | fs_info->log_root_recovering = 0; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5606 | kfree(log_root_tree); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5607 | |
Josef Bacik | abefa55 | 2013-04-24 16:40:05 -0400 | [diff] [blame] | 5608 | return 0; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5609 | error: |
Josef Bacik | b50c6e2 | 2013-04-25 15:55:30 -0400 | [diff] [blame] | 5610 | if (wc.trans) |
| 5611 | btrfs_end_transaction(wc.trans, fs_info->tree_root); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5612 | btrfs_free_path(path); |
| 5613 | return ret; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5614 | } |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 5615 | |
| 5616 | /* |
| 5617 | * there are some corner cases where we want to force a full |
| 5618 | * commit instead of allowing a directory to be logged. |
| 5619 | * |
| 5620 | * They revolve around files there were unlinked from the directory, and |
| 5621 | * this function updates the parent directory so that a full commit is |
| 5622 | * properly done if it is fsync'd later after the unlinks are done. |
Filipe Manana | 2be63d5 | 2016-02-12 11:34:23 +0000 | [diff] [blame] | 5623 | * |
| 5624 | * Must be called before the unlink operations (updates to the subvolume tree, |
| 5625 | * inodes, etc) are done. |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 5626 | */ |
| 5627 | void btrfs_record_unlink_dir(struct btrfs_trans_handle *trans, |
| 5628 | struct inode *dir, struct inode *inode, |
| 5629 | int for_rename) |
| 5630 | { |
| 5631 | /* |
Chris Mason | af4176b | 2009-03-24 10:24:31 -0400 | [diff] [blame] | 5632 | * when we're logging a file, if it hasn't been renamed |
| 5633 | * or unlinked, and its inode is fully committed on disk, |
| 5634 | * we don't have to worry about walking up the directory chain |
| 5635 | * to log its parents. |
| 5636 | * |
| 5637 | * So, we use the last_unlink_trans field to put this transid |
| 5638 | * into the file. When the file is logged we check it and |
| 5639 | * don't log the parents if the file is fully on disk. |
| 5640 | */ |
Filipe Manana | 657ed1a | 2016-04-06 17:11:56 +0100 | [diff] [blame] | 5641 | mutex_lock(&BTRFS_I(inode)->log_mutex); |
| 5642 | BTRFS_I(inode)->last_unlink_trans = trans->transid; |
| 5643 | mutex_unlock(&BTRFS_I(inode)->log_mutex); |
Chris Mason | af4176b | 2009-03-24 10:24:31 -0400 | [diff] [blame] | 5644 | |
| 5645 | /* |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 5646 | * if this directory was already logged any new |
| 5647 | * names for this file/dir will get recorded |
| 5648 | */ |
| 5649 | smp_mb(); |
| 5650 | if (BTRFS_I(dir)->logged_trans == trans->transid) |
| 5651 | return; |
| 5652 | |
| 5653 | /* |
| 5654 | * if the inode we're about to unlink was logged, |
| 5655 | * the log will be properly updated for any new names |
| 5656 | */ |
| 5657 | if (BTRFS_I(inode)->logged_trans == trans->transid) |
| 5658 | return; |
| 5659 | |
| 5660 | /* |
| 5661 | * when renaming files across directories, if the directory |
| 5662 | * there we're unlinking from gets fsync'd later on, there's |
| 5663 | * no way to find the destination directory later and fsync it |
| 5664 | * properly. So, we have to be conservative and force commits |
| 5665 | * so the new name gets discovered. |
| 5666 | */ |
| 5667 | if (for_rename) |
| 5668 | goto record; |
| 5669 | |
| 5670 | /* we can safely do the unlink without any special recording */ |
| 5671 | return; |
| 5672 | |
| 5673 | record: |
Filipe Manana | 2be63d5 | 2016-02-12 11:34:23 +0000 | [diff] [blame] | 5674 | mutex_lock(&BTRFS_I(dir)->log_mutex); |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 5675 | BTRFS_I(dir)->last_unlink_trans = trans->transid; |
Filipe Manana | 2be63d5 | 2016-02-12 11:34:23 +0000 | [diff] [blame] | 5676 | mutex_unlock(&BTRFS_I(dir)->log_mutex); |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 5677 | } |
| 5678 | |
| 5679 | /* |
Filipe Manana | 1ec9a1a | 2016-02-10 10:42:25 +0000 | [diff] [blame] | 5680 | * Make sure that if someone attempts to fsync the parent directory of a deleted |
| 5681 | * snapshot, it ends up triggering a transaction commit. This is to guarantee |
| 5682 | * that after replaying the log tree of the parent directory's root we will not |
| 5683 | * see the snapshot anymore and at log replay time we will not see any log tree |
| 5684 | * corresponding to the deleted snapshot's root, which could lead to replaying |
| 5685 | * it after replaying the log tree of the parent directory (which would replay |
| 5686 | * the snapshot delete operation). |
Filipe Manana | 2be63d5 | 2016-02-12 11:34:23 +0000 | [diff] [blame] | 5687 | * |
| 5688 | * Must be called before the actual snapshot destroy operation (updates to the |
| 5689 | * parent root and tree of tree roots trees, etc) are done. |
Filipe Manana | 1ec9a1a | 2016-02-10 10:42:25 +0000 | [diff] [blame] | 5690 | */ |
| 5691 | void btrfs_record_snapshot_destroy(struct btrfs_trans_handle *trans, |
| 5692 | struct inode *dir) |
| 5693 | { |
Filipe Manana | 2be63d5 | 2016-02-12 11:34:23 +0000 | [diff] [blame] | 5694 | mutex_lock(&BTRFS_I(dir)->log_mutex); |
Filipe Manana | 1ec9a1a | 2016-02-10 10:42:25 +0000 | [diff] [blame] | 5695 | BTRFS_I(dir)->last_unlink_trans = trans->transid; |
Filipe Manana | 2be63d5 | 2016-02-12 11:34:23 +0000 | [diff] [blame] | 5696 | mutex_unlock(&BTRFS_I(dir)->log_mutex); |
Filipe Manana | 1ec9a1a | 2016-02-10 10:42:25 +0000 | [diff] [blame] | 5697 | } |
| 5698 | |
| 5699 | /* |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 5700 | * Call this after adding a new name for a file and it will properly |
| 5701 | * update the log to reflect the new name. |
| 5702 | * |
| 5703 | * It will return zero if all goes well, and it will return 1 if a |
| 5704 | * full transaction commit is required. |
| 5705 | */ |
| 5706 | int btrfs_log_new_name(struct btrfs_trans_handle *trans, |
| 5707 | struct inode *inode, struct inode *old_dir, |
| 5708 | struct dentry *parent) |
| 5709 | { |
| 5710 | struct btrfs_root * root = BTRFS_I(inode)->root; |
| 5711 | |
| 5712 | /* |
Chris Mason | af4176b | 2009-03-24 10:24:31 -0400 | [diff] [blame] | 5713 | * this will force the logging code to walk the dentry chain |
| 5714 | * up for the file |
| 5715 | */ |
| 5716 | if (S_ISREG(inode->i_mode)) |
| 5717 | BTRFS_I(inode)->last_unlink_trans = trans->transid; |
| 5718 | |
| 5719 | /* |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 5720 | * if this inode hasn't been logged and directory we're renaming it |
| 5721 | * from hasn't been logged, we don't need to log it |
| 5722 | */ |
| 5723 | if (BTRFS_I(inode)->logged_trans <= |
| 5724 | root->fs_info->last_trans_committed && |
| 5725 | (!old_dir || BTRFS_I(old_dir)->logged_trans <= |
| 5726 | root->fs_info->last_trans_committed)) |
| 5727 | return 0; |
| 5728 | |
Filipe Manana | 49dae1b | 2014-09-06 22:34:39 +0100 | [diff] [blame] | 5729 | return btrfs_log_inode_parent(trans, root, inode, parent, 0, |
| 5730 | LLONG_MAX, 1, NULL); |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 5731 | } |
| 5732 | |