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Btrfs: fix BUG_ON() caused by ENOSPC when relocating space
[linux-2.6-block.git] / fs / btrfs / disk-io.c
CommitLineData
6cbd5570
CM		 1/*
2 * Copyright (C) 2007 Oracle. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
17 */
18
e20d96d6 19#include <linux/fs.h>
d98237b3 20#include <linux/blkdev.h>
87cbda5c 21#include <linux/scatterlist.h>
22b0ebda 22#include <linux/swap.h>
0f7d52f4 23#include <linux/radix-tree.h>
35b7e476 24#include <linux/writeback.h>
d397712b 25#include <linux/buffer_head.h>
ce9adaa5 26#include <linux/workqueue.h>
a74a4b97 27#include <linux/kthread.h>
4b4e25f2 28#include <linux/freezer.h>
163e783e 29#include <linux/crc32c.h>
5a0e3ad6 30#include <linux/slab.h>
784b4e29 31#include <linux/migrate.h>
7a36ddec 32#include <linux/ratelimit.h>
7e75bf3f 33#include <asm/unaligned.h>
4b4e25f2 34#include "compat.h"
eb60ceac
CM		 35#include "ctree.h"
36#include "disk-io.h"
e089f05c 37#include "transaction.h"
0f7d52f4 38#include "btrfs_inode.h"
0b86a832 39#include "volumes.h"
db94535d 40#include "print-tree.h"
8b712842 41#include "async-thread.h"
925baedd 42#include "locking.h"
e02119d5 43#include "tree-log.h"
fa9c0d79 44#include "free-space-cache.h"
581bb050 45#include "inode-map.h"
eb60ceac 46
d1310b2e 47static struct extent_io_ops btree_extent_io_ops;
8b712842 48static void end_workqueue_fn(struct btrfs_work *work);
4df27c4d 49static void free_fs_root(struct btrfs_root *root);
acce952b 50static void btrfs_check_super_valid(struct btrfs_fs_info *fs_info,
51 int read_only);
52static int btrfs_destroy_ordered_operations(struct btrfs_root *root);
53static int btrfs_destroy_ordered_extents(struct btrfs_root *root);
54static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
55 struct btrfs_root *root);
56static int btrfs_destroy_pending_snapshots(struct btrfs_transaction *t);
57static int btrfs_destroy_delalloc_inodes(struct btrfs_root *root);
58static int btrfs_destroy_marked_extents(struct btrfs_root *root,
59 struct extent_io_tree *dirty_pages,
60 int mark);
61static int btrfs_destroy_pinned_extent(struct btrfs_root *root,
62 struct extent_io_tree *pinned_extents);
63static int btrfs_cleanup_transaction(struct btrfs_root *root);
ce9adaa5 64
d352ac68
CM		 65/*
66 * end_io_wq structs are used to do processing in task context when an IO is
67 * complete. This is used during reads to verify checksums, and it is used
68 * by writes to insert metadata for new file extents after IO is complete.
69 */
ce9adaa5
CM		 70struct end_io_wq {
71 struct bio *bio;
72 bio_end_io_t *end_io;
73 void *private;
74 struct btrfs_fs_info *info;
75 int error;
22c59948 76 int metadata;
ce9adaa5 77 struct list_head list;
8b712842 78 struct btrfs_work work;
ce9adaa5 79};
0da5468f 80
d352ac68
CM		 81/*
82 * async submit bios are used to offload expensive checksumming
83 * onto the worker threads. They checksum file and metadata bios
84 * just before they are sent down the IO stack.
85 */
44b8bd7e
CM		 86struct async_submit_bio {
87 struct inode *inode;
88 struct bio *bio;
89 struct list_head list;
4a69a410
CM		 90 extent_submit_bio_hook_t *submit_bio_start;
91 extent_submit_bio_hook_t *submit_bio_done;
44b8bd7e
CM		 92 int rw;
93 int mirror_num;
c8b97818 94 unsigned long bio_flags;
eaf25d93
CM		 95 /*
96 * bio_offset is optional, can be used if the pages in the bio
97 * can't tell us where in the file the bio should go
98 */
99 u64 bio_offset;
8b712842 100 struct btrfs_work work;
44b8bd7e
CM		 101};
102
4008c04a
CM		 103/* These are used to set the lockdep class on the extent buffer locks.
104 * The class is set by the readpage_end_io_hook after the buffer has
105 * passed csum validation but before the pages are unlocked.
106 *
107 * The lockdep class is also set by btrfs_init_new_buffer on freshly
108 * allocated blocks.
109 *
110 * The class is based on the level in the tree block, which allows lockdep
111 * to know that lower nodes nest inside the locks of higher nodes.
112 *
113 * We also add a check to make sure the highest level of the tree is
114 * the same as our lockdep setup here. If BTRFS_MAX_LEVEL changes, this
115 * code needs update as well.
116 */
117#ifdef CONFIG_DEBUG_LOCK_ALLOC
118# if BTRFS_MAX_LEVEL != 8
119# error
120# endif
121static struct lock_class_key btrfs_eb_class[BTRFS_MAX_LEVEL + 1];
122static const char *btrfs_eb_name[BTRFS_MAX_LEVEL + 1] = {
123 /* leaf */
124 "btrfs-extent-00",
125 "btrfs-extent-01",
126 "btrfs-extent-02",
127 "btrfs-extent-03",
128 "btrfs-extent-04",
129 "btrfs-extent-05",
130 "btrfs-extent-06",
131 "btrfs-extent-07",
132 /* highest possible level */
133 "btrfs-extent-08",
134};
135#endif
136
d352ac68
CM		 137/*
138 * extents on the btree inode are pretty simple, there's one extent
139 * that covers the entire device
140 */
b2950863 141static struct extent_map *btree_get_extent(struct inode *inode,
306e16ce 142 struct page *page, size_t pg_offset, u64 start, u64 len,
b2950863 143 int create)
7eccb903 144{
5f39d397
CM		 145 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
146 struct extent_map *em;
147 int ret;
148
890871be 149 read_lock(&em_tree->lock);
d1310b2e 150 em = lookup_extent_mapping(em_tree, start, len);
a061fc8d
CM		 151 if (em) {
152 em->bdev =
153 BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev;
890871be 154 read_unlock(&em_tree->lock);
5f39d397 155 goto out;
a061fc8d 156 }
890871be 157 read_unlock(&em_tree->lock);
7b13b7b1 158
172ddd60 159 em = alloc_extent_map();
5f39d397
CM		 160 if (!em) {
161 em = ERR_PTR(-ENOMEM);
162 goto out;
163 }
164 em->start = 0;
0afbaf8c 165 em->len = (u64)-1;
c8b97818 166 em->block_len = (u64)-1;
5f39d397 167 em->block_start = 0;
a061fc8d 168 em->bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev;
d1310b2e 169
890871be 170 write_lock(&em_tree->lock);
5f39d397
CM		 171 ret = add_extent_mapping(em_tree, em);
172 if (ret == -EEXIST) {
0afbaf8c
CM		 173 u64 failed_start = em->start;
174 u64 failed_len = em->len;
175
5f39d397 176 free_extent_map(em);
7b13b7b1 177 em = lookup_extent_mapping(em_tree, start, len);
0afbaf8c 178 if (em) {
7b13b7b1 179 ret = 0;
0afbaf8c
CM		 180 } else {
181 em = lookup_extent_mapping(em_tree, failed_start,
182 failed_len);
7b13b7b1 183 ret = -EIO;
0afbaf8c 184 }
5f39d397 185 } else if (ret) {
7b13b7b1
CM		 186 free_extent_map(em);
187 em = NULL;
5f39d397 188 }
890871be 189 write_unlock(&em_tree->lock);
7b13b7b1
CM		 190
191 if (ret)
192 em = ERR_PTR(ret);
5f39d397
CM		 193out:
194 return em;
7eccb903
CM		 195}
196
19c00ddc
CM		 197u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len)
198{
163e783e 199 return crc32c(seed, data, len);
19c00ddc
CM		 200}
201
202void btrfs_csum_final(u32 crc, char *result)
203{
7e75bf3f 204 put_unaligned_le32(~crc, result);
19c00ddc
CM		 205}
206
d352ac68
CM		 207/*
208 * compute the csum for a btree block, and either verify it or write it
209 * into the csum field of the block.
210 */
19c00ddc
CM		 211static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
212 int verify)
213{
607d432d
JB		 214 u16 csum_size =
215 btrfs_super_csum_size(&root->fs_info->super_copy);
216 char *result = NULL;
19c00ddc
CM		 217 unsigned long len;
218 unsigned long cur_len;
219 unsigned long offset = BTRFS_CSUM_SIZE;
220 char *map_token = NULL;
221 char *kaddr;
222 unsigned long map_start;
223 unsigned long map_len;
224 int err;
225 u32 crc = ~(u32)0;
607d432d 226 unsigned long inline_result;
19c00ddc
CM		 227
228 len = buf->len - offset;
d397712b 229 while (len > 0) {
19c00ddc
CM		 230 err = map_private_extent_buffer(buf, offset, 32,
231 &map_token, &kaddr,
232 &map_start, &map_len, KM_USER0);
d397712b 233 if (err)
19c00ddc 234 return 1;
19c00ddc
CM		 235 cur_len = min(len, map_len - (offset - map_start));
236 crc = btrfs_csum_data(root, kaddr + offset - map_start,
237 crc, cur_len);
238 len -= cur_len;
239 offset += cur_len;
240 unmap_extent_buffer(buf, map_token, KM_USER0);
241 }
607d432d
JB		 242 if (csum_size > sizeof(inline_result)) {
243 result = kzalloc(csum_size * sizeof(char), GFP_NOFS);
244 if (!result)
245 return 1;
246 } else {
247 result = (char *)&inline_result;
248 }
249
19c00ddc
CM		 250 btrfs_csum_final(crc, result);
251
252 if (verify) {
607d432d 253 if (memcmp_extent_buffer(buf, result, 0, csum_size)) {
e4204ded
CM		 254 u32 val;
255 u32 found = 0;
607d432d 256 memcpy(&found, result, csum_size);
e4204ded 257
607d432d 258 read_extent_buffer(buf, &val, 0, csum_size);
7a36ddec 259 printk_ratelimited(KERN_INFO "btrfs: %s checksum verify "
193f284d
CM		 260 "failed on %llu wanted %X found %X "
261 "level %d\n",
262 root->fs_info->sb->s_id,
263 (unsigned long long)buf->start, val, found,
264 btrfs_header_level(buf));
607d432d
JB		 265 if (result != (char *)&inline_result)
266 kfree(result);
19c00ddc
CM		 267 return 1;
268 }
269 } else {
607d432d 270 write_extent_buffer(buf, result, 0, csum_size);
19c00ddc 271 }
607d432d
JB		 272 if (result != (char *)&inline_result)
273 kfree(result);
19c00ddc
CM		 274 return 0;
275}
276
d352ac68
CM		 277/*
278 * we can't consider a given block up to date unless the transid of the
279 * block matches the transid in the parent node's pointer. This is how we
280 * detect blocks that either didn't get written at all or got written
281 * in the wrong place.
282 */
1259ab75
CM		 283static int verify_parent_transid(struct extent_io_tree *io_tree,
284 struct extent_buffer *eb, u64 parent_transid)
285{
2ac55d41 286 struct extent_state *cached_state = NULL;
1259ab75
CM		 287 int ret;
288
289 if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
290 return 0;
291
2ac55d41
JB		 292 lock_extent_bits(io_tree, eb->start, eb->start + eb->len - 1,
293 0, &cached_state, GFP_NOFS);
294 if (extent_buffer_uptodate(io_tree, eb, cached_state) &&
1259ab75
CM		 295 btrfs_header_generation(eb) == parent_transid) {
296 ret = 0;
297 goto out;
298 }
7a36ddec 299 printk_ratelimited("parent transid verify failed on %llu wanted %llu "
193f284d
CM		 300 "found %llu\n",
301 (unsigned long long)eb->start,
302 (unsigned long long)parent_transid,
303 (unsigned long long)btrfs_header_generation(eb));
1259ab75 304 ret = 1;
2ac55d41 305 clear_extent_buffer_uptodate(io_tree, eb, &cached_state);
33958dc6 306out:
2ac55d41
JB		 307 unlock_extent_cached(io_tree, eb->start, eb->start + eb->len - 1,
308 &cached_state, GFP_NOFS);
1259ab75 309 return ret;
1259ab75
CM		 310}
311
d352ac68
CM		 312/*
313 * helper to read a given tree block, doing retries as required when
314 * the checksums don't match and we have alternate mirrors to try.
315 */
f188591e
CM		 316static int btree_read_extent_buffer_pages(struct btrfs_root *root,
317 struct extent_buffer *eb,
ca7a79ad 318 u64 start, u64 parent_transid)
f188591e
CM		 319{
320 struct extent_io_tree *io_tree;
321 int ret;
322 int num_copies = 0;
323 int mirror_num = 0;
324
a826d6dc 325 clear_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags);
f188591e
CM		 326 io_tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree;
327 while (1) {
328 ret = read_extent_buffer_pages(io_tree, eb, start, 1,
329 btree_get_extent, mirror_num);
1259ab75
CM		 330 if (!ret &&
331 !verify_parent_transid(io_tree, eb, parent_transid))
f188591e 332 return ret;
d397712b 333
a826d6dc
JB		 334 /*
335 * This buffer's crc is fine, but its contents are corrupted, so
336 * there is no reason to read the other copies, they won't be
337 * any less wrong.
338 */
339 if (test_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags))
340 return ret;
341
f188591e
CM		 342 num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
343 eb->start, eb->len);
4235298e 344 if (num_copies == 1)
f188591e 345 return ret;
4235298e 346
f188591e 347 mirror_num++;
4235298e 348 if (mirror_num > num_copies)
f188591e 349 return ret;
f188591e 350 }
f188591e
CM		 351 return -EIO;
352}
19c00ddc 353
d352ac68 354/*
d397712b
CM		 355 * checksum a dirty tree block before IO. This has extra checks to make sure
356 * we only fill in the checksum field in the first page of a multi-page block
d352ac68 357 */
d397712b 358
b2950863 359static int csum_dirty_buffer(struct btrfs_root *root, struct page *page)
19c00ddc 360{
d1310b2e 361 struct extent_io_tree *tree;
35ebb934 362 u64 start = (u64)page->index << PAGE_CACHE_SHIFT;
19c00ddc 363 u64 found_start;
19c00ddc
CM		 364 unsigned long len;
365 struct extent_buffer *eb;
f188591e
CM		 366 int ret;
367
d1310b2e 368 tree = &BTRFS_I(page->mapping->host)->io_tree;
19c00ddc 369
eb14ab8e
CM		 370 if (page->private == EXTENT_PAGE_PRIVATE) {
371 WARN_ON(1);
19c00ddc 372 goto out;
eb14ab8e
CM		 373 }
374 if (!page->private) {
375 WARN_ON(1);
19c00ddc 376 goto out;
eb14ab8e 377 }
19c00ddc 378 len = page->private >> 2;
d397712b
CM		 379 WARN_ON(len == 0);
380
ba144192 381 eb = alloc_extent_buffer(tree, start, len, page);
91ca338d
TI		 382 if (eb == NULL) {
383 WARN_ON(1);
384 goto out;
385 }
ca7a79ad
CM		 386 ret = btree_read_extent_buffer_pages(root, eb, start + PAGE_CACHE_SIZE,
387 btrfs_header_generation(eb));
f188591e 388 BUG_ON(ret);
784b4e29
CM		 389 WARN_ON(!btrfs_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN));
390
19c00ddc
CM		 391 found_start = btrfs_header_bytenr(eb);
392 if (found_start != start) {
55c69072
CM		 393 WARN_ON(1);
394 goto err;
395 }
396 if (eb->first_page != page) {
55c69072
CM		 397 WARN_ON(1);
398 goto err;
399 }
400 if (!PageUptodate(page)) {
55c69072
CM		 401 WARN_ON(1);
402 goto err;
19c00ddc 403 }
19c00ddc 404 csum_tree_block(root, eb, 0);
55c69072 405err:
19c00ddc
CM		 406 free_extent_buffer(eb);
407out:
408 return 0;
409}
410
2b82032c
YZ		 411static int check_tree_block_fsid(struct btrfs_root *root,
412 struct extent_buffer *eb)
413{
414 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
415 u8 fsid[BTRFS_UUID_SIZE];
416 int ret = 1;
417
418 read_extent_buffer(eb, fsid, (unsigned long)btrfs_header_fsid(eb),
419 BTRFS_FSID_SIZE);
420 while (fs_devices) {
421 if (!memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE)) {
422 ret = 0;
423 break;
424 }
425 fs_devices = fs_devices->seed;
426 }
427 return ret;
428}
429
a826d6dc
JB		 430#define CORRUPT(reason, eb, root, slot) \
431 printk(KERN_CRIT "btrfs: corrupt leaf, %s: block=%llu," \
432 "root=%llu, slot=%d\n", reason, \
433 (unsigned long long)btrfs_header_bytenr(eb), \
434 (unsigned long long)root->objectid, slot)
435
436static noinline int check_leaf(struct btrfs_root *root,
437 struct extent_buffer *leaf)
438{
439 struct btrfs_key key;
440 struct btrfs_key leaf_key;
441 u32 nritems = btrfs_header_nritems(leaf);
442 int slot;
443
444 if (nritems == 0)
445 return 0;
446
447 /* Check the 0 item */
448 if (btrfs_item_offset_nr(leaf, 0) + btrfs_item_size_nr(leaf, 0) !=
449 BTRFS_LEAF_DATA_SIZE(root)) {
450 CORRUPT("invalid item offset size pair", leaf, root, 0);
451 return -EIO;
452 }
453
454 /*
455 * Check to make sure each items keys are in the correct order and their
456 * offsets make sense. We only have to loop through nritems-1 because
457 * we check the current slot against the next slot, which verifies the
458 * next slot's offset+size makes sense and that the current's slot
459 * offset is correct.
460 */
461 for (slot = 0; slot < nritems - 1; slot++) {
462 btrfs_item_key_to_cpu(leaf, &leaf_key, slot);
463 btrfs_item_key_to_cpu(leaf, &key, slot + 1);
464
465 /* Make sure the keys are in the right order */
466 if (btrfs_comp_cpu_keys(&leaf_key, &key) >= 0) {
467 CORRUPT("bad key order", leaf, root, slot);
468 return -EIO;
469 }
470
471 /*
472 * Make sure the offset and ends are right, remember that the
473 * item data starts at the end of the leaf and grows towards the
474 * front.
475 */
476 if (btrfs_item_offset_nr(leaf, slot) !=
477 btrfs_item_end_nr(leaf, slot + 1)) {
478 CORRUPT("slot offset bad", leaf, root, slot);
479 return -EIO;
480 }
481
482 /*
483 * Check to make sure that we don't point outside of the leaf,
484 * just incase all the items are consistent to eachother, but
485 * all point outside of the leaf.
486 */
487 if (btrfs_item_end_nr(leaf, slot) >
488 BTRFS_LEAF_DATA_SIZE(root)) {
489 CORRUPT("slot end outside of leaf", leaf, root, slot);
490 return -EIO;
491 }
492 }
493
494 return 0;
495}
496
4008c04a
CM		 497#ifdef CONFIG_DEBUG_LOCK_ALLOC
498void btrfs_set_buffer_lockdep_class(struct extent_buffer *eb, int level)
499{
500 lockdep_set_class_and_name(&eb->lock,
501 &btrfs_eb_class[level],
502 btrfs_eb_name[level]);
503}
504#endif
505
b2950863 506static int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end,
ce9adaa5
CM		 507 struct extent_state *state)
508{
509 struct extent_io_tree *tree;
510 u64 found_start;
511 int found_level;
512 unsigned long len;
513 struct extent_buffer *eb;
514 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
f188591e 515 int ret = 0;
ce9adaa5
CM		 516
517 tree = &BTRFS_I(page->mapping->host)->io_tree;
518 if (page->private == EXTENT_PAGE_PRIVATE)
519 goto out;
520 if (!page->private)
521 goto out;
d397712b 522
ce9adaa5 523 len = page->private >> 2;
d397712b
CM		 524 WARN_ON(len == 0);
525
ba144192 526 eb = alloc_extent_buffer(tree, start, len, page);
91ca338d
TI		 527 if (eb == NULL) {
528 ret = -EIO;
529 goto out;
530 }
f188591e 531
ce9adaa5 532 found_start = btrfs_header_bytenr(eb);
23a07867 533 if (found_start != start) {
7a36ddec 534 printk_ratelimited(KERN_INFO "btrfs bad tree block start "
193f284d
CM		 535 "%llu %llu\n",
536 (unsigned long long)found_start,
537 (unsigned long long)eb->start);
f188591e 538 ret = -EIO;
ce9adaa5
CM		 539 goto err;
540 }
541 if (eb->first_page != page) {
d397712b
CM		 542 printk(KERN_INFO "btrfs bad first page %lu %lu\n",
543 eb->first_page->index, page->index);
ce9adaa5 544 WARN_ON(1);
f188591e 545 ret = -EIO;
ce9adaa5
CM		 546 goto err;
547 }
2b82032c 548 if (check_tree_block_fsid(root, eb)) {
7a36ddec 549 printk_ratelimited(KERN_INFO "btrfs bad fsid on block %llu\n",
193f284d 550 (unsigned long long)eb->start);
1259ab75
CM		 551 ret = -EIO;
552 goto err;
553 }
ce9adaa5
CM		 554 found_level = btrfs_header_level(eb);
555
4008c04a
CM		 556 btrfs_set_buffer_lockdep_class(eb, found_level);
557
ce9adaa5 558 ret = csum_tree_block(root, eb, 1);
a826d6dc 559 if (ret) {
f188591e 560 ret = -EIO;
a826d6dc
JB		 561 goto err;
562 }
563
564 /*
565 * If this is a leaf block and it is corrupt, set the corrupt bit so
566 * that we don't try and read the other copies of this block, just
567 * return -EIO.
568 */
569 if (found_level == 0 && check_leaf(root, eb)) {
570 set_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags);
571 ret = -EIO;
572 }
ce9adaa5
CM		 573
574 end = min_t(u64, eb->len, PAGE_CACHE_SIZE);
575 end = eb->start + end - 1;
ce9adaa5
CM		 576err:
577 free_extent_buffer(eb);
578out:
f188591e 579 return ret;
ce9adaa5
CM		 580}
581
ce9adaa5 582static void end_workqueue_bio(struct bio *bio, int err)
ce9adaa5
CM		 583{
584 struct end_io_wq *end_io_wq = bio->bi_private;
585 struct btrfs_fs_info *fs_info;
ce9adaa5 586
ce9adaa5 587 fs_info = end_io_wq->info;
ce9adaa5 588 end_io_wq->error = err;
8b712842
CM		 589 end_io_wq->work.func = end_workqueue_fn;
590 end_io_wq->work.flags = 0;
d20f7043 591
7b6d91da 592 if (bio->bi_rw & REQ_WRITE) {
0cb59c99 593 if (end_io_wq->metadata == 1)
cad321ad
CM		 594 btrfs_queue_worker(&fs_info->endio_meta_write_workers,
595 &end_io_wq->work);
0cb59c99
JB		 596 else if (end_io_wq->metadata == 2)
597 btrfs_queue_worker(&fs_info->endio_freespace_worker,
598 &end_io_wq->work);
cad321ad
CM		 599 else
600 btrfs_queue_worker(&fs_info->endio_write_workers,
601 &end_io_wq->work);
d20f7043
CM		 602 } else {
603 if (end_io_wq->metadata)
604 btrfs_queue_worker(&fs_info->endio_meta_workers,
605 &end_io_wq->work);
606 else
607 btrfs_queue_worker(&fs_info->endio_workers,
608 &end_io_wq->work);
609 }
ce9adaa5
CM		 610}
611
0cb59c99
JB		 612/*
613 * For the metadata arg you want
614 *
615 * 0 - if data
616 * 1 - if normal metadta
617 * 2 - if writing to the free space cache area
618 */
22c59948
CM		 619int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
620 int metadata)
0b86a832 621{
ce9adaa5 622 struct end_io_wq *end_io_wq;
ce9adaa5
CM		 623 end_io_wq = kmalloc(sizeof(*end_io_wq), GFP_NOFS);
624 if (!end_io_wq)
625 return -ENOMEM;
626
627 end_io_wq->private = bio->bi_private;
628 end_io_wq->end_io = bio->bi_end_io;
22c59948 629 end_io_wq->info = info;
ce9adaa5
CM		 630 end_io_wq->error = 0;
631 end_io_wq->bio = bio;
22c59948 632 end_io_wq->metadata = metadata;
ce9adaa5
CM		 633
634 bio->bi_private = end_io_wq;
635 bio->bi_end_io = end_workqueue_bio;
22c59948
CM		 636 return 0;
637}
638
b64a2851 639unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info)
0986fe9e 640{
4854ddd0
CM		 641 unsigned long limit = min_t(unsigned long,
642 info->workers.max_workers,
643 info->fs_devices->open_devices);
644 return 256 * limit;
645}
0986fe9e 646
4a69a410
CM		 647static void run_one_async_start(struct btrfs_work *work)
648{
4a69a410
CM		 649 struct async_submit_bio *async;
650
651 async = container_of(work, struct async_submit_bio, work);
4a69a410 652 async->submit_bio_start(async->inode, async->rw, async->bio,
eaf25d93
CM		 653 async->mirror_num, async->bio_flags,
654 async->bio_offset);
4a69a410
CM		 655}
656
657static void run_one_async_done(struct btrfs_work *work)
8b712842
CM		 658{
659 struct btrfs_fs_info *fs_info;
660 struct async_submit_bio *async;
4854ddd0 661 int limit;
8b712842
CM		 662
663 async = container_of(work, struct async_submit_bio, work);
664 fs_info = BTRFS_I(async->inode)->root->fs_info;
4854ddd0 665
b64a2851 666 limit = btrfs_async_submit_limit(fs_info);
4854ddd0
CM		 667 limit = limit * 2 / 3;
668
8b712842 669 atomic_dec(&fs_info->nr_async_submits);
0986fe9e 670
b64a2851
CM		 671 if (atomic_read(&fs_info->nr_async_submits) < limit &&
672 waitqueue_active(&fs_info->async_submit_wait))
4854ddd0
CM		 673 wake_up(&fs_info->async_submit_wait);
674
4a69a410 675 async->submit_bio_done(async->inode, async->rw, async->bio,
eaf25d93
CM		 676 async->mirror_num, async->bio_flags,
677 async->bio_offset);
4a69a410
CM		 678}
679
680static void run_one_async_free(struct btrfs_work *work)
681{
682 struct async_submit_bio *async;
683
684 async = container_of(work, struct async_submit_bio, work);
8b712842
CM		 685 kfree(async);
686}
687
44b8bd7e
CM		 688int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
689 int rw, struct bio *bio, int mirror_num,
c8b97818 690 unsigned long bio_flags,
eaf25d93 691 u64 bio_offset,
4a69a410
CM		 692 extent_submit_bio_hook_t *submit_bio_start,
693 extent_submit_bio_hook_t *submit_bio_done)
44b8bd7e
CM		 694{
695 struct async_submit_bio *async;
696
697 async = kmalloc(sizeof(*async), GFP_NOFS);
698 if (!async)
699 return -ENOMEM;
700
701 async->inode = inode;
702 async->rw = rw;
703 async->bio = bio;
704 async->mirror_num = mirror_num;
4a69a410
CM		 705 async->submit_bio_start = submit_bio_start;
706 async->submit_bio_done = submit_bio_done;
707
708 async->work.func = run_one_async_start;
709 async->work.ordered_func = run_one_async_done;
710 async->work.ordered_free = run_one_async_free;
711
8b712842 712 async->work.flags = 0;
c8b97818 713 async->bio_flags = bio_flags;
eaf25d93 714 async->bio_offset = bio_offset;
8c8bee1d 715
cb03c743 716 atomic_inc(&fs_info->nr_async_submits);
d313d7a3 717
7b6d91da 718 if (rw & REQ_SYNC)
d313d7a3
CM		 719 btrfs_set_work_high_prio(&async->work);
720
8b712842 721 btrfs_queue_worker(&fs_info->workers, &async->work);
9473f16c 722
d397712b 723 while (atomic_read(&fs_info->async_submit_draining) &&
771ed689
CM		 724 atomic_read(&fs_info->nr_async_submits)) {
725 wait_event(fs_info->async_submit_wait,
726 (atomic_read(&fs_info->nr_async_submits) == 0));
727 }
728
44b8bd7e
CM		 729 return 0;
730}
731
ce3ed71a
CM		 732static int btree_csum_one_bio(struct bio *bio)
733{
734 struct bio_vec *bvec = bio->bi_io_vec;
735 int bio_index = 0;
736 struct btrfs_root *root;
737
738 WARN_ON(bio->bi_vcnt <= 0);
d397712b 739 while (bio_index < bio->bi_vcnt) {
ce3ed71a
CM		 740 root = BTRFS_I(bvec->bv_page->mapping->host)->root;
741 csum_dirty_buffer(root, bvec->bv_page);
742 bio_index++;
743 bvec++;
744 }
745 return 0;
746}
747
4a69a410
CM		 748static int __btree_submit_bio_start(struct inode *inode, int rw,
749 struct bio *bio, int mirror_num,
eaf25d93
CM		 750 unsigned long bio_flags,
751 u64 bio_offset)
22c59948 752{
8b712842
CM		 753 /*
754 * when we're called for a write, we're already in the async
5443be45 755 * submission context. Just jump into btrfs_map_bio
8b712842 756 */
4a69a410
CM		 757 btree_csum_one_bio(bio);
758 return 0;
759}
22c59948 760
4a69a410 761static int __btree_submit_bio_done(struct inode *inode, int rw, struct bio *bio,
eaf25d93
CM		 762 int mirror_num, unsigned long bio_flags,
763 u64 bio_offset)
4a69a410 764{
8b712842 765 /*
4a69a410
CM		 766 * when we're called for a write, we're already in the async
767 * submission context. Just jump into btrfs_map_bio
8b712842 768 */
8b712842 769 return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num, 1);
0b86a832
CM		 770}
771
44b8bd7e 772static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
eaf25d93
CM		 773 int mirror_num, unsigned long bio_flags,
774 u64 bio_offset)
44b8bd7e 775{
cad321ad
CM		 776 int ret;
777
778 ret = btrfs_bio_wq_end_io(BTRFS_I(inode)->root->fs_info,
779 bio, 1);
780 BUG_ON(ret);
781
7b6d91da 782 if (!(rw & REQ_WRITE)) {
4a69a410
CM		 783 /*
784 * called for a read, do the setup so that checksum validation
785 * can happen in the async kernel threads
786 */
4a69a410 787 return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio,
6f3577bd 788 mirror_num, 0);
44b8bd7e 789 }
d313d7a3 790
cad321ad
CM		 791 /*
792 * kthread helpers are used to submit writes so that checksumming
793 * can happen in parallel across all CPUs
794 */
44b8bd7e 795 return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info,
c8b97818 796 inode, rw, bio, mirror_num, 0,
eaf25d93 797 bio_offset,
4a69a410
CM		 798 __btree_submit_bio_start,
799 __btree_submit_bio_done);
44b8bd7e
CM		 800}
801
3dd1462e 802#ifdef CONFIG_MIGRATION
784b4e29
CM		 803static int btree_migratepage(struct address_space *mapping,
804 struct page *newpage, struct page *page)
805{
806 /*
807 * we can't safely write a btree page from here,
808 * we haven't done the locking hook
809 */
810 if (PageDirty(page))
811 return -EAGAIN;
812 /*
813 * Buffers may be managed in a filesystem specific way.
814 * We must have no buffers or drop them.
815 */
816 if (page_has_private(page) &&
817 !try_to_release_page(page, GFP_KERNEL))
818 return -EAGAIN;
784b4e29
CM		 819 return migrate_page(mapping, newpage, page);
820}
3dd1462e 821#endif
784b4e29 822
0da5468f
CM		 823static int btree_writepage(struct page *page, struct writeback_control *wbc)
824{
d1310b2e 825 struct extent_io_tree *tree;
b9473439
CM		 826 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
827 struct extent_buffer *eb;
828 int was_dirty;
829
d1310b2e 830 tree = &BTRFS_I(page->mapping->host)->io_tree;
b9473439
CM		 831 if (!(current->flags & PF_MEMALLOC)) {
832 return extent_write_full_page(tree, page,
833 btree_get_extent, wbc);
834 }
5443be45 835
b9473439 836 redirty_page_for_writepage(wbc, page);
784b4e29 837 eb = btrfs_find_tree_block(root, page_offset(page), PAGE_CACHE_SIZE);
b9473439
CM		 838 WARN_ON(!eb);
839
840 was_dirty = test_and_set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags);
841 if (!was_dirty) {
842 spin_lock(&root->fs_info->delalloc_lock);
843 root->fs_info->dirty_metadata_bytes += PAGE_CACHE_SIZE;
844 spin_unlock(&root->fs_info->delalloc_lock);
5443be45 845 }
b9473439
CM		 846 free_extent_buffer(eb);
847
848 unlock_page(page);
849 return 0;
5f39d397 850}
0da5468f
CM		 851
852static int btree_writepages(struct address_space *mapping,
853 struct writeback_control *wbc)
854{
d1310b2e
CM		 855 struct extent_io_tree *tree;
856 tree = &BTRFS_I(mapping->host)->io_tree;
d8d5f3e1 857 if (wbc->sync_mode == WB_SYNC_NONE) {
b9473439 858 struct btrfs_root *root = BTRFS_I(mapping->host)->root;
793955bc 859 u64 num_dirty;
24ab9cd8 860 unsigned long thresh = 32 * 1024 * 1024;
448d640b
CM		 861
862 if (wbc->for_kupdate)
863 return 0;
864
b9473439
CM		 865 /* this is a bit racy, but that's ok */
866 num_dirty = root->fs_info->dirty_metadata_bytes;
d397712b 867 if (num_dirty < thresh)
793955bc 868 return 0;
793955bc 869 }
0da5468f
CM		 870 return extent_writepages(tree, mapping, btree_get_extent, wbc);
871}
872
b2950863 873static int btree_readpage(struct file *file, struct page *page)
5f39d397 874{
d1310b2e
CM		 875 struct extent_io_tree *tree;
876 tree = &BTRFS_I(page->mapping->host)->io_tree;
5f39d397
CM		 877 return extent_read_full_page(tree, page, btree_get_extent);
878}
22b0ebda 879
70dec807 880static int btree_releasepage(struct page *page, gfp_t gfp_flags)
5f39d397 881{
d1310b2e
CM		 882 struct extent_io_tree *tree;
883 struct extent_map_tree *map;
5f39d397 884 int ret;
d98237b3 885
98509cfc 886 if (PageWriteback(page) || PageDirty(page))
d397712b 887 return 0;
98509cfc 888
d1310b2e
CM		 889 tree = &BTRFS_I(page->mapping->host)->io_tree;
890 map = &BTRFS_I(page->mapping->host)->extent_tree;
6af118ce 891
7b13b7b1 892 ret = try_release_extent_state(map, tree, page, gfp_flags);
d397712b 893 if (!ret)
6af118ce 894 return 0;
6af118ce
CM		 895
896 ret = try_release_extent_buffer(tree, page);
5f39d397
CM		 897 if (ret == 1) {
898 ClearPagePrivate(page);
899 set_page_private(page, 0);
900 page_cache_release(page);
901 }
6af118ce 902
d98237b3
CM		 903 return ret;
904}
905
5f39d397 906static void btree_invalidatepage(struct page *page, unsigned long offset)
d98237b3 907{
d1310b2e
CM		 908 struct extent_io_tree *tree;
909 tree = &BTRFS_I(page->mapping->host)->io_tree;
5f39d397
CM		 910 extent_invalidatepage(tree, page, offset);
911 btree_releasepage(page, GFP_NOFS);
9ad6b7bc 912 if (PagePrivate(page)) {
d397712b
CM		 913 printk(KERN_WARNING "btrfs warning page private not zero "
914 "on page %llu\n", (unsigned long long)page_offset(page));
9ad6b7bc
CM		 915 ClearPagePrivate(page);
916 set_page_private(page, 0);
917 page_cache_release(page);
918 }
d98237b3
CM		 919}
920
7f09410b 921static const struct address_space_operations btree_aops = {
d98237b3
CM		 922 .readpage = btree_readpage,
923 .writepage = btree_writepage,
0da5468f 924 .writepages = btree_writepages,
5f39d397
CM		 925 .releasepage = btree_releasepage,
926 .invalidatepage = btree_invalidatepage,
5a92bc88 927#ifdef CONFIG_MIGRATION
784b4e29 928 .migratepage = btree_migratepage,
5a92bc88 929#endif
d98237b3
CM		 930};
931
ca7a79ad
CM		 932int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
933 u64 parent_transid)
090d1875 934{
5f39d397
CM		 935 struct extent_buffer *buf = NULL;
936 struct inode *btree_inode = root->fs_info->btree_inode;
de428b63 937 int ret = 0;
090d1875 938
db94535d 939 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
5f39d397 940 if (!buf)
090d1875 941 return 0;
d1310b2e 942 read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree,
f188591e 943 buf, 0, 0, btree_get_extent, 0);
5f39d397 944 free_extent_buffer(buf);
de428b63 945 return ret;
090d1875
CM		 946}
947
0999df54
CM		 948struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
949 u64 bytenr, u32 blocksize)
950{
951 struct inode *btree_inode = root->fs_info->btree_inode;
952 struct extent_buffer *eb;
953 eb = find_extent_buffer(&BTRFS_I(btree_inode)->io_tree,
f09d1f60 954 bytenr, blocksize);
0999df54
CM		 955 return eb;
956}
957
958struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
959 u64 bytenr, u32 blocksize)
960{
961 struct inode *btree_inode = root->fs_info->btree_inode;
962 struct extent_buffer *eb;
963
964 eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->io_tree,
ba144192 965 bytenr, blocksize, NULL);
0999df54
CM		 966 return eb;
967}
968
969
e02119d5
CM		 970int btrfs_write_tree_block(struct extent_buffer *buf)
971{
8aa38c31
CH		 972 return filemap_fdatawrite_range(buf->first_page->mapping, buf->start,
973 buf->start + buf->len - 1);
e02119d5
CM		 974}
975
976int btrfs_wait_tree_block_writeback(struct extent_buffer *buf)
977{
8aa38c31
CH		 978 return filemap_fdatawait_range(buf->first_page->mapping,
979 buf->start, buf->start + buf->len - 1);
e02119d5
CM		 980}
981
0999df54 982struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
ca7a79ad 983 u32 blocksize, u64 parent_transid)
0999df54
CM		 984{
985 struct extent_buffer *buf = NULL;
0999df54
CM		 986 int ret;
987
0999df54
CM		 988 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
989 if (!buf)
990 return NULL;
0999df54 991
ca7a79ad 992 ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid);
ce9adaa5 993
d397712b 994 if (ret == 0)
b4ce94de 995 set_bit(EXTENT_BUFFER_UPTODATE, &buf->bflags);
5f39d397 996 return buf;
ce9adaa5 997
eb60ceac
CM		 998}
999
e089f05c 1000int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
5f39d397 1001 struct extent_buffer *buf)
ed2ff2cb 1002{
5f39d397 1003 struct inode *btree_inode = root->fs_info->btree_inode;
55c69072 1004 if (btrfs_header_generation(buf) ==
925baedd 1005 root->fs_info->running_transaction->transid) {
b9447ef8 1006 btrfs_assert_tree_locked(buf);
b4ce94de 1007
b9473439
CM		 1008 if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)) {
1009 spin_lock(&root->fs_info->delalloc_lock);
1010 if (root->fs_info->dirty_metadata_bytes >= buf->len)
1011 root->fs_info->dirty_metadata_bytes -= buf->len;
1012 else
1013 WARN_ON(1);
1014 spin_unlock(&root->fs_info->delalloc_lock);
1015 }
b4ce94de 1016
b9473439
CM		 1017 /* ugh, clear_extent_buffer_dirty needs to lock the page */
1018 btrfs_set_lock_blocking(buf);
d1310b2e 1019 clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree,
55c69072 1020 buf);
925baedd 1021 }
5f39d397
CM		 1022 return 0;
1023}
1024
db94535d 1025static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
87ee04eb 1026 u32 stripesize, struct btrfs_root *root,
9f5fae2f 1027 struct btrfs_fs_info *fs_info,
e20d96d6 1028 u64 objectid)
d97e63b6 1029{
cfaa7295 1030 root->node = NULL;
a28ec197 1031 root->commit_root = NULL;
db94535d
CM		 1032 root->sectorsize = sectorsize;
1033 root->nodesize = nodesize;
1034 root->leafsize = leafsize;
87ee04eb 1035 root->stripesize = stripesize;
123abc88 1036 root->ref_cows = 0;
0b86a832 1037 root->track_dirty = 0;
c71bf099 1038 root->in_radix = 0;
d68fc57b
YZ		 1039 root->orphan_item_inserted = 0;
1040 root->orphan_cleanup_state = 0;
0b86a832 1041
9f5fae2f 1042 root->fs_info = fs_info;
0f7d52f4
CM		 1043 root->objectid = objectid;
1044 root->last_trans = 0;
13a8a7c8 1045 root->highest_objectid = 0;
58176a96 1046 root->name = NULL;
6bef4d31 1047 root->inode_tree = RB_ROOT;
16cdcec7 1048 INIT_RADIX_TREE(&root->delayed_nodes_tree, GFP_ATOMIC);
f0486c68 1049 root->block_rsv = NULL;
d68fc57b 1050 root->orphan_block_rsv = NULL;
0b86a832
CM		 1051
1052 INIT_LIST_HEAD(&root->dirty_list);
7b128766 1053 INIT_LIST_HEAD(&root->orphan_list);
5d4f98a2 1054 INIT_LIST_HEAD(&root->root_list);
d68fc57b 1055 spin_lock_init(&root->orphan_lock);
5d4f98a2 1056 spin_lock_init(&root->inode_lock);
f0486c68 1057 spin_lock_init(&root->accounting_lock);
a2135011 1058 mutex_init(&root->objectid_mutex);
e02119d5 1059 mutex_init(&root->log_mutex);
7237f183
YZ		 1060 init_waitqueue_head(&root->log_writer_wait);
1061 init_waitqueue_head(&root->log_commit_wait[0]);
1062 init_waitqueue_head(&root->log_commit_wait[1]);
1063 atomic_set(&root->log_commit[0], 0);
1064 atomic_set(&root->log_commit[1], 0);
1065 atomic_set(&root->log_writers, 0);
1066 root->log_batch = 0;
1067 root->log_transid = 0;
257c62e1 1068 root->last_log_commit = 0;
d0c803c4 1069 extent_io_tree_init(&root->dirty_log_pages,
f993c883 1070 fs_info->btree_inode->i_mapping);
017e5369 1071
3768f368
CM		 1072 memset(&root->root_key, 0, sizeof(root->root_key));
1073 memset(&root->root_item, 0, sizeof(root->root_item));
6702ed49 1074 memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
58176a96 1075 memset(&root->root_kobj, 0, sizeof(root->root_kobj));
3f157a2f 1076 root->defrag_trans_start = fs_info->generation;
58176a96 1077 init_completion(&root->kobj_unregister);
6702ed49 1078 root->defrag_running = 0;
4d775673 1079 root->root_key.objectid = objectid;
3394e160
CM		 1080 root->anon_super.s_root = NULL;
1081 root->anon_super.s_dev = 0;
1082 INIT_LIST_HEAD(&root->anon_super.s_list);
1083 INIT_LIST_HEAD(&root->anon_super.s_instances);
1084 init_rwsem(&root->anon_super.s_umount);
1085
3768f368
CM		 1086 return 0;
1087}
1088
db94535d 1089static int find_and_setup_root(struct btrfs_root *tree_root,
9f5fae2f
CM		 1090 struct btrfs_fs_info *fs_info,
1091 u64 objectid,
e20d96d6 1092 struct btrfs_root *root)
3768f368
CM		 1093{
1094 int ret;
db94535d 1095 u32 blocksize;
84234f3a 1096 u64 generation;
3768f368 1097
db94535d 1098 __setup_root(tree_root->nodesize, tree_root->leafsize,
87ee04eb
CM		 1099 tree_root->sectorsize, tree_root->stripesize,
1100 root, fs_info, objectid);
3768f368
CM		 1101 ret = btrfs_find_last_root(tree_root, objectid,
1102 &root->root_item, &root->root_key);
4df27c4d
YZ		 1103 if (ret > 0)
1104 return -ENOENT;
3768f368
CM		 1105 BUG_ON(ret);
1106
84234f3a 1107 generation = btrfs_root_generation(&root->root_item);
db94535d
CM		 1108 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
1109 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
84234f3a 1110 blocksize, generation);
68433b73
CM		 1111 if (!root->node || !btrfs_buffer_uptodate(root->node, generation)) {
1112 free_extent_buffer(root->node);
1113 return -EIO;
1114 }
4df27c4d 1115 root->commit_root = btrfs_root_node(root);
d97e63b6
CM		 1116 return 0;
1117}
1118
7237f183
YZ		 1119static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans,
1120 struct btrfs_fs_info *fs_info)
0f7d52f4
CM		 1121{
1122 struct btrfs_root *root;
1123 struct btrfs_root *tree_root = fs_info->tree_root;
7237f183 1124 struct extent_buffer *leaf;
e02119d5
CM		 1125
1126 root = kzalloc(sizeof(*root), GFP_NOFS);
1127 if (!root)
7237f183 1128 return ERR_PTR(-ENOMEM);
e02119d5
CM		 1129
1130 __setup_root(tree_root->nodesize, tree_root->leafsize,
1131 tree_root->sectorsize, tree_root->stripesize,
1132 root, fs_info, BTRFS_TREE_LOG_OBJECTID);
1133
1134 root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID;
1135 root->root_key.type = BTRFS_ROOT_ITEM_KEY;
1136 root->root_key.offset = BTRFS_TREE_LOG_OBJECTID;
7237f183
YZ		 1137 /*
1138 * log trees do not get reference counted because they go away
1139 * before a real commit is actually done. They do store pointers
1140 * to file data extents, and those reference counts still get
1141 * updated (along with back refs to the log tree).
1142 */
e02119d5
CM		 1143 root->ref_cows = 0;
1144
5d4f98a2
YZ		 1145 leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0,
1146 BTRFS_TREE_LOG_OBJECTID, NULL, 0, 0, 0);
7237f183
YZ		 1147 if (IS_ERR(leaf)) {
1148 kfree(root);
1149 return ERR_CAST(leaf);
1150 }
e02119d5 1151
5d4f98a2
YZ		 1152 memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
1153 btrfs_set_header_bytenr(leaf, leaf->start);
1154 btrfs_set_header_generation(leaf, trans->transid);
1155 btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
1156 btrfs_set_header_owner(leaf, BTRFS_TREE_LOG_OBJECTID);
7237f183 1157 root->node = leaf;
e02119d5
CM		 1158
1159 write_extent_buffer(root->node, root->fs_info->fsid,
1160 (unsigned long)btrfs_header_fsid(root->node),
1161 BTRFS_FSID_SIZE);
1162 btrfs_mark_buffer_dirty(root->node);
1163 btrfs_tree_unlock(root->node);
7237f183
YZ		 1164 return root;
1165}
1166
1167int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
1168 struct btrfs_fs_info *fs_info)
1169{
1170 struct btrfs_root *log_root;
1171
1172 log_root = alloc_log_tree(trans, fs_info);
1173 if (IS_ERR(log_root))
1174 return PTR_ERR(log_root);
1175 WARN_ON(fs_info->log_root_tree);
1176 fs_info->log_root_tree = log_root;
1177 return 0;
1178}
1179
1180int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
1181 struct btrfs_root *root)
1182{
1183 struct btrfs_root *log_root;
1184 struct btrfs_inode_item *inode_item;
1185
1186 log_root = alloc_log_tree(trans, root->fs_info);
1187 if (IS_ERR(log_root))
1188 return PTR_ERR(log_root);
1189
1190 log_root->last_trans = trans->transid;
1191 log_root->root_key.offset = root->root_key.objectid;
1192
1193 inode_item = &log_root->root_item.inode;
1194 inode_item->generation = cpu_to_le64(1);
1195 inode_item->size = cpu_to_le64(3);
1196 inode_item->nlink = cpu_to_le32(1);
1197 inode_item->nbytes = cpu_to_le64(root->leafsize);
1198 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
1199
5d4f98a2 1200 btrfs_set_root_node(&log_root->root_item, log_root->node);
7237f183
YZ		 1201
1202 WARN_ON(root->log_root);
1203 root->log_root = log_root;
1204 root->log_transid = 0;
257c62e1 1205 root->last_log_commit = 0;
e02119d5
CM		 1206 return 0;
1207}
1208
1209struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root,
1210 struct btrfs_key *location)
1211{
1212 struct btrfs_root *root;
1213 struct btrfs_fs_info *fs_info = tree_root->fs_info;
0f7d52f4 1214 struct btrfs_path *path;
5f39d397 1215 struct extent_buffer *l;
84234f3a 1216 u64 generation;
db94535d 1217 u32 blocksize;
0f7d52f4
CM		 1218 int ret = 0;
1219
5eda7b5e 1220 root = kzalloc(sizeof(*root), GFP_NOFS);
0cf6c620 1221 if (!root)
0f7d52f4 1222 return ERR_PTR(-ENOMEM);
0f7d52f4 1223 if (location->offset == (u64)-1) {
db94535d 1224 ret = find_and_setup_root(tree_root, fs_info,
0f7d52f4
CM		 1225 location->objectid, root);
1226 if (ret) {
0f7d52f4
CM		 1227 kfree(root);
1228 return ERR_PTR(ret);
1229 }
13a8a7c8 1230 goto out;
0f7d52f4
CM		 1231 }
1232
db94535d 1233 __setup_root(tree_root->nodesize, tree_root->leafsize,
87ee04eb
CM		 1234 tree_root->sectorsize, tree_root->stripesize,
1235 root, fs_info, location->objectid);
0f7d52f4
CM		 1236
1237 path = btrfs_alloc_path();
db5b493a
TI		 1238 if (!path) {
1239 kfree(root);
1240 return ERR_PTR(-ENOMEM);
1241 }
0f7d52f4 1242 ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
13a8a7c8
YZ		 1243 if (ret == 0) {
1244 l = path->nodes[0];
1245 read_extent_buffer(l, &root->root_item,
1246 btrfs_item_ptr_offset(l, path->slots[0]),
1247 sizeof(root->root_item));
1248 memcpy(&root->root_key, location, sizeof(*location));
0f7d52f4 1249 }
0f7d52f4
CM		 1250 btrfs_free_path(path);
1251 if (ret) {
5e540f77 1252 kfree(root);
13a8a7c8
YZ		 1253 if (ret > 0)
1254 ret = -ENOENT;
0f7d52f4
CM		 1255 return ERR_PTR(ret);
1256 }
13a8a7c8 1257
84234f3a 1258 generation = btrfs_root_generation(&root->root_item);
db94535d
CM		 1259 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
1260 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
84234f3a 1261 blocksize, generation);
5d4f98a2 1262 root->commit_root = btrfs_root_node(root);
0f7d52f4 1263 BUG_ON(!root->node);
13a8a7c8 1264out:
08fe4db1 1265 if (location->objectid != BTRFS_TREE_LOG_OBJECTID) {
e02119d5 1266 root->ref_cows = 1;
08fe4db1
LZ		 1267 btrfs_check_and_init_root_item(&root->root_item);
1268 }
13a8a7c8 1269
5eda7b5e
CM		 1270 return root;
1271}
1272
edbd8d4e
CM		 1273struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
1274 struct btrfs_key *location)
5eda7b5e
CM		 1275{
1276 struct btrfs_root *root;
1277 int ret;
1278
edbd8d4e
CM		 1279 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
1280 return fs_info->tree_root;
1281 if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
1282 return fs_info->extent_root;
8f18cf13
CM		 1283 if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
1284 return fs_info->chunk_root;
1285 if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
1286 return fs_info->dev_root;
0403e47e
YZ		 1287 if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
1288 return fs_info->csum_root;
4df27c4d
YZ		 1289again:
1290 spin_lock(&fs_info->fs_roots_radix_lock);
5eda7b5e
CM		 1291 root = radix_tree_lookup(&fs_info->fs_roots_radix,
1292 (unsigned long)location->objectid);
4df27c4d 1293 spin_unlock(&fs_info->fs_roots_radix_lock);
5eda7b5e
CM		 1294 if (root)
1295 return root;
1296
e02119d5 1297 root = btrfs_read_fs_root_no_radix(fs_info->tree_root, location);
5eda7b5e
CM		 1298 if (IS_ERR(root))
1299 return root;
3394e160 1300
581bb050 1301 root->free_ino_ctl = kzalloc(sizeof(*root->free_ino_ctl), GFP_NOFS);
581bb050
LZ		 1302 root->free_ino_pinned = kzalloc(sizeof(*root->free_ino_pinned),
1303 GFP_NOFS);
35a30d7c
DS		 1304 if (!root->free_ino_pinned || !root->free_ino_ctl) {
1305 ret = -ENOMEM;
581bb050 1306 goto fail;
35a30d7c 1307 }
581bb050
LZ		 1308
1309 btrfs_init_free_ino_ctl(root);
1310 mutex_init(&root->fs_commit_mutex);
1311 spin_lock_init(&root->cache_lock);
1312 init_waitqueue_head(&root->cache_wait);
1313
ac08aedf
CM		 1314 ret = set_anon_super(&root->anon_super, NULL);
1315 if (ret)
1316 goto fail;
3394e160 1317
d68fc57b
YZ		 1318 if (btrfs_root_refs(&root->root_item) == 0) {
1319 ret = -ENOENT;
1320 goto fail;
1321 }
1322
1323 ret = btrfs_find_orphan_item(fs_info->tree_root, location->objectid);
1324 if (ret < 0)
1325 goto fail;
1326 if (ret == 0)
1327 root->orphan_item_inserted = 1;
1328
4df27c4d
YZ		 1329 ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM);
1330 if (ret)
1331 goto fail;
1332
1333 spin_lock(&fs_info->fs_roots_radix_lock);
2619ba1f
CM		 1334 ret = radix_tree_insert(&fs_info->fs_roots_radix,
1335 (unsigned long)root->root_key.objectid,
0f7d52f4 1336 root);
d68fc57b 1337 if (ret == 0)
4df27c4d 1338 root->in_radix = 1;
d68fc57b 1339
4df27c4d
YZ		 1340 spin_unlock(&fs_info->fs_roots_radix_lock);
1341 radix_tree_preload_end();
0f7d52f4 1342 if (ret) {
4df27c4d
YZ		 1343 if (ret == -EEXIST) {
1344 free_fs_root(root);
1345 goto again;
1346 }
1347 goto fail;
0f7d52f4 1348 }
4df27c4d
YZ		 1349
1350 ret = btrfs_find_dead_roots(fs_info->tree_root,
1351 root->root_key.objectid);
1352 WARN_ON(ret);
edbd8d4e 1353 return root;
4df27c4d
YZ		 1354fail:
1355 free_fs_root(root);
1356 return ERR_PTR(ret);
edbd8d4e
CM		 1357}
1358
04160088
CM		 1359static int btrfs_congested_fn(void *congested_data, int bdi_bits)
1360{
1361 struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data;
1362 int ret = 0;
04160088
CM		 1363 struct btrfs_device *device;
1364 struct backing_dev_info *bdi;
b7967db7 1365
1f78160c
XG		 1366 rcu_read_lock();
1367 list_for_each_entry_rcu(device, &info->fs_devices->devices, dev_list) {
dfe25020
CM		 1368 if (!device->bdev)
1369 continue;
04160088
CM		 1370 bdi = blk_get_backing_dev_info(device->bdev);
1371 if (bdi && bdi_congested(bdi, bdi_bits)) {
1372 ret = 1;
1373 break;
1374 }
1375 }
1f78160c 1376 rcu_read_unlock();
04160088
CM		 1377 return ret;
1378}
1379
ad081f14
JA		 1380/*
1381 * If this fails, caller must call bdi_destroy() to get rid of the
1382 * bdi again.
1383 */
04160088
CM		 1384static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi)
1385{
ad081f14
JA		 1386 int err;
1387
1388 bdi->capabilities = BDI_CAP_MAP_COPY;
e6d086d8 1389 err = bdi_setup_and_register(bdi, "btrfs", BDI_CAP_MAP_COPY);
ad081f14
JA		 1390 if (err)
1391 return err;
1392
4575c9cc 1393 bdi->ra_pages = default_backing_dev_info.ra_pages;
04160088
CM		 1394 bdi->congested_fn = btrfs_congested_fn;
1395 bdi->congested_data = info;
1396 return 0;
1397}
1398
ce9adaa5
CM		 1399static int bio_ready_for_csum(struct bio *bio)
1400{
1401 u64 length = 0;
1402 u64 buf_len = 0;
1403 u64 start = 0;
1404 struct page *page;
1405 struct extent_io_tree *io_tree = NULL;
ce9adaa5
CM		 1406 struct bio_vec *bvec;
1407 int i;
1408 int ret;
1409
1410 bio_for_each_segment(bvec, bio, i) {
1411 page = bvec->bv_page;
1412 if (page->private == EXTENT_PAGE_PRIVATE) {
1413 length += bvec->bv_len;
1414 continue;
1415 }
1416 if (!page->private) {
1417 length += bvec->bv_len;
1418 continue;
1419 }
1420 length = bvec->bv_len;
1421 buf_len = page->private >> 2;
1422 start = page_offset(page) + bvec->bv_offset;
1423 io_tree = &BTRFS_I(page->mapping->host)->io_tree;
ce9adaa5
CM		 1424 }
1425 /* are we fully contained in this bio? */
1426 if (buf_len <= length)
1427 return 1;
1428
1429 ret = extent_range_uptodate(io_tree, start + length,
1430 start + buf_len - 1);
ce9adaa5
CM		 1431 return ret;
1432}
1433
8b712842
CM		 1434/*
1435 * called by the kthread helper functions to finally call the bio end_io
1436 * functions. This is where read checksum verification actually happens
1437 */
1438static void end_workqueue_fn(struct btrfs_work *work)
ce9adaa5 1439{
ce9adaa5 1440 struct bio *bio;
8b712842
CM		 1441 struct end_io_wq *end_io_wq;
1442 struct btrfs_fs_info *fs_info;
ce9adaa5 1443 int error;
ce9adaa5 1444
8b712842
CM		 1445 end_io_wq = container_of(work, struct end_io_wq, work);
1446 bio = end_io_wq->bio;
1447 fs_info = end_io_wq->info;
ce9adaa5 1448
cad321ad 1449 /* metadata bio reads are special because the whole tree block must
8b712842
CM		 1450 * be checksummed at once. This makes sure the entire block is in
1451 * ram and up to date before trying to verify things. For
1452 * blocksize <= pagesize, it is basically a noop
1453 */
7b6d91da 1454 if (!(bio->bi_rw & REQ_WRITE) && end_io_wq->metadata &&
cad321ad 1455 !bio_ready_for_csum(bio)) {
d20f7043 1456 btrfs_queue_worker(&fs_info->endio_meta_workers,
8b712842
CM		 1457 &end_io_wq->work);
1458 return;
1459 }
1460 error = end_io_wq->error;
1461 bio->bi_private = end_io_wq->private;
1462 bio->bi_end_io = end_io_wq->end_io;
1463 kfree(end_io_wq);
8b712842 1464 bio_endio(bio, error);
44b8bd7e
CM		 1465}
1466
a74a4b97
CM		 1467static int cleaner_kthread(void *arg)
1468{
1469 struct btrfs_root *root = arg;
1470
1471 do {
a74a4b97 1472 vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE);
76dda93c
YZ		 1473
1474 if (!(root->fs_info->sb->s_flags & MS_RDONLY) &&
1475 mutex_trylock(&root->fs_info->cleaner_mutex)) {
24bbcf04 1476 btrfs_run_delayed_iputs(root);
76dda93c
YZ		 1477 btrfs_clean_old_snapshots(root);
1478 mutex_unlock(&root->fs_info->cleaner_mutex);
4cb5300b 1479 btrfs_run_defrag_inodes(root->fs_info);
76dda93c 1480 }
a74a4b97
CM		 1481
1482 if (freezing(current)) {
1483 refrigerator();
1484 } else {
a74a4b97 1485 set_current_state(TASK_INTERRUPTIBLE);
8929ecfa
YZ		 1486 if (!kthread_should_stop())
1487 schedule();
a74a4b97
CM		 1488 __set_current_state(TASK_RUNNING);
1489 }
1490 } while (!kthread_should_stop());
1491 return 0;
1492}
1493
1494static int transaction_kthread(void *arg)
1495{
1496 struct btrfs_root *root = arg;
1497 struct btrfs_trans_handle *trans;
1498 struct btrfs_transaction *cur;
8929ecfa 1499 u64 transid;
a74a4b97
CM		 1500 unsigned long now;
1501 unsigned long delay;
1502 int ret;
1503
1504 do {
a74a4b97
CM		 1505 delay = HZ * 30;
1506 vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE);
1507 mutex_lock(&root->fs_info->transaction_kthread_mutex);
1508
a4abeea4 1509 spin_lock(&root->fs_info->trans_lock);
a74a4b97
CM		 1510 cur = root->fs_info->running_transaction;
1511 if (!cur) {
a4abeea4 1512 spin_unlock(&root->fs_info->trans_lock);
a74a4b97
CM		 1513 goto sleep;
1514 }
31153d81 1515
a74a4b97 1516 now = get_seconds();
8929ecfa
YZ		 1517 if (!cur->blocked &&
1518 (now < cur->start_time || now - cur->start_time < 30)) {
a4abeea4 1519 spin_unlock(&root->fs_info->trans_lock);
a74a4b97
CM		 1520 delay = HZ * 5;
1521 goto sleep;
1522 }
8929ecfa 1523 transid = cur->transid;
a4abeea4 1524 spin_unlock(&root->fs_info->trans_lock);
56bec294 1525
7a7eaa40 1526 trans = btrfs_join_transaction(root);
3612b495 1527 BUG_ON(IS_ERR(trans));
8929ecfa
YZ		 1528 if (transid == trans->transid) {
1529 ret = btrfs_commit_transaction(trans, root);
1530 BUG_ON(ret);
1531 } else {
1532 btrfs_end_transaction(trans, root);
1533 }
a74a4b97
CM		 1534sleep:
1535 wake_up_process(root->fs_info->cleaner_kthread);
1536 mutex_unlock(&root->fs_info->transaction_kthread_mutex);
1537
1538 if (freezing(current)) {
1539 refrigerator();
1540 } else {
a74a4b97 1541 set_current_state(TASK_INTERRUPTIBLE);
8929ecfa
YZ		 1542 if (!kthread_should_stop() &&
1543 !btrfs_transaction_blocked(root->fs_info))
1544 schedule_timeout(delay);
a74a4b97
CM		 1545 __set_current_state(TASK_RUNNING);
1546 }
1547 } while (!kthread_should_stop());
1548 return 0;
1549}
1550
8a4b83cc 1551struct btrfs_root *open_ctree(struct super_block *sb,
dfe25020
CM		 1552 struct btrfs_fs_devices *fs_devices,
1553 char *options)
2e635a27 1554{
db94535d
CM		 1555 u32 sectorsize;
1556 u32 nodesize;
1557 u32 leafsize;
1558 u32 blocksize;
87ee04eb 1559 u32 stripesize;
84234f3a 1560 u64 generation;
f2b636e8 1561 u64 features;
3de4586c 1562 struct btrfs_key location;
a061fc8d 1563 struct buffer_head *bh;
e02119d5 1564 struct btrfs_root *extent_root = kzalloc(sizeof(struct btrfs_root),
e20d96d6 1565 GFP_NOFS);
d20f7043
CM		 1566 struct btrfs_root *csum_root = kzalloc(sizeof(struct btrfs_root),
1567 GFP_NOFS);
450ba0ea 1568 struct btrfs_root *tree_root = btrfs_sb(sb);
4891aca2 1569 struct btrfs_fs_info *fs_info = NULL;
e02119d5 1570 struct btrfs_root *chunk_root = kzalloc(sizeof(struct btrfs_root),
0b86a832 1571 GFP_NOFS);
e02119d5 1572 struct btrfs_root *dev_root = kzalloc(sizeof(struct btrfs_root),
0b86a832 1573 GFP_NOFS);
e02119d5
CM		 1574 struct btrfs_root *log_tree_root;
1575
eb60ceac 1576 int ret;
e58ca020 1577 int err = -EINVAL;
4543df7e 1578
2c90e5d6 1579 struct btrfs_super_block *disk_super;
8790d502 1580
4891aca2 1581 if (!extent_root || !tree_root || !tree_root->fs_info ||
d20f7043 1582 !chunk_root || !dev_root || !csum_root) {
39279cc3
CM		 1583 err = -ENOMEM;
1584 goto fail;
1585 }
4891aca2 1586 fs_info = tree_root->fs_info;
76dda93c
YZ		 1587
1588 ret = init_srcu_struct(&fs_info->subvol_srcu);
1589 if (ret) {
1590 err = ret;
1591 goto fail;
1592 }
1593
1594 ret = setup_bdi(fs_info, &fs_info->bdi);
1595 if (ret) {
1596 err = ret;
1597 goto fail_srcu;
1598 }
1599
1600 fs_info->btree_inode = new_inode(sb);
1601 if (!fs_info->btree_inode) {
1602 err = -ENOMEM;
1603 goto fail_bdi;
1604 }
1605
1561deda
MX		 1606 fs_info->btree_inode->i_mapping->flags &= ~__GFP_FS;
1607
76dda93c 1608 INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC);
8fd17795 1609 INIT_LIST_HEAD(&fs_info->trans_list);
facda1e7 1610 INIT_LIST_HEAD(&fs_info->dead_roots);
24bbcf04 1611 INIT_LIST_HEAD(&fs_info->delayed_iputs);
19c00ddc 1612 INIT_LIST_HEAD(&fs_info->hashers);
ea8c2819 1613 INIT_LIST_HEAD(&fs_info->delalloc_inodes);
5a3f23d5 1614 INIT_LIST_HEAD(&fs_info->ordered_operations);
11833d66 1615 INIT_LIST_HEAD(&fs_info->caching_block_groups);
1832a6d5 1616 spin_lock_init(&fs_info->delalloc_lock);
a4abeea4 1617 spin_lock_init(&fs_info->trans_lock);
31153d81 1618 spin_lock_init(&fs_info->ref_cache_lock);
76dda93c 1619 spin_lock_init(&fs_info->fs_roots_radix_lock);
24bbcf04 1620 spin_lock_init(&fs_info->delayed_iput_lock);
4cb5300b 1621 spin_lock_init(&fs_info->defrag_inodes_lock);
7585717f 1622 mutex_init(&fs_info->reloc_mutex);
19c00ddc 1623
58176a96 1624 init_completion(&fs_info->kobj_unregister);
9f5fae2f
CM		 1625 fs_info->tree_root = tree_root;
1626 fs_info->extent_root = extent_root;
d20f7043 1627 fs_info->csum_root = csum_root;
0b86a832
CM		 1628 fs_info->chunk_root = chunk_root;
1629 fs_info->dev_root = dev_root;
8a4b83cc 1630 fs_info->fs_devices = fs_devices;
0b86a832 1631 INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
6324fbf3 1632 INIT_LIST_HEAD(&fs_info->space_info);
0b86a832 1633 btrfs_mapping_init(&fs_info->mapping_tree);
f0486c68
YZ		 1634 btrfs_init_block_rsv(&fs_info->global_block_rsv);
1635 btrfs_init_block_rsv(&fs_info->delalloc_block_rsv);
1636 btrfs_init_block_rsv(&fs_info->trans_block_rsv);
1637 btrfs_init_block_rsv(&fs_info->chunk_block_rsv);
1638 btrfs_init_block_rsv(&fs_info->empty_block_rsv);
1639 INIT_LIST_HEAD(&fs_info->durable_block_rsv_list);
1640 mutex_init(&fs_info->durable_block_rsv_mutex);
cb03c743 1641 atomic_set(&fs_info->nr_async_submits, 0);
771ed689 1642 atomic_set(&fs_info->async_delalloc_pages, 0);
8c8bee1d 1643 atomic_set(&fs_info->async_submit_draining, 0);
0986fe9e 1644 atomic_set(&fs_info->nr_async_bios, 0);
4cb5300b 1645 atomic_set(&fs_info->defrag_running, 0);
e20d96d6 1646 fs_info->sb = sb;
6f568d35 1647 fs_info->max_inline = 8192 * 1024;
9ed74f2d 1648 fs_info->metadata_ratio = 0;
4cb5300b 1649 fs_info->defrag_inodes = RB_ROOT;
a4abeea4 1650 fs_info->trans_no_join = 0;
c8b97818 1651
b34b086c
CM		 1652 fs_info->thread_pool_size = min_t(unsigned long,
1653 num_online_cpus() + 2, 8);
0afbaf8c 1654
3eaa2885
CM		 1655 INIT_LIST_HEAD(&fs_info->ordered_extents);
1656 spin_lock_init(&fs_info->ordered_extent_lock);
16cdcec7
MX		 1657 fs_info->delayed_root = kmalloc(sizeof(struct btrfs_delayed_root),
1658 GFP_NOFS);
1659 if (!fs_info->delayed_root) {
1660 err = -ENOMEM;
1661 goto fail_iput;
1662 }
1663 btrfs_init_delayed_root(fs_info->delayed_root);
3eaa2885 1664
a2de733c
AJ		 1665 mutex_init(&fs_info->scrub_lock);
1666 atomic_set(&fs_info->scrubs_running, 0);
1667 atomic_set(&fs_info->scrub_pause_req, 0);
1668 atomic_set(&fs_info->scrubs_paused, 0);
1669 atomic_set(&fs_info->scrub_cancel_req, 0);
1670 init_waitqueue_head(&fs_info->scrub_pause_wait);
1671 init_rwsem(&fs_info->scrub_super_lock);
1672 fs_info->scrub_workers_refcnt = 0;
a2de733c 1673
a061fc8d
CM		 1674 sb->s_blocksize = 4096;
1675 sb->s_blocksize_bits = blksize_bits(4096);
32a88aa1 1676 sb->s_bdi = &fs_info->bdi;
a061fc8d 1677
76dda93c
YZ		 1678 fs_info->btree_inode->i_ino = BTRFS_BTREE_INODE_OBJECTID;
1679 fs_info->btree_inode->i_nlink = 1;
0afbaf8c
CM		 1680 /*
1681 * we set the i_size on the btree inode to the max possible int.
1682 * the real end of the address space is determined by all of
1683 * the devices in the system
1684 */
1685 fs_info->btree_inode->i_size = OFFSET_MAX;
d98237b3 1686 fs_info->btree_inode->i_mapping->a_ops = &btree_aops;
04160088
CM		 1687 fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi;
1688
5d4f98a2 1689 RB_CLEAR_NODE(&BTRFS_I(fs_info->btree_inode)->rb_node);
d1310b2e 1690 extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree,
f993c883 1691 fs_info->btree_inode->i_mapping);
a8067e02 1692 extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree);
d1310b2e
CM		 1693
1694 BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops;
0da5468f 1695
76dda93c
YZ		 1696 BTRFS_I(fs_info->btree_inode)->root = tree_root;
1697 memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
1698 sizeof(struct btrfs_key));
1699 BTRFS_I(fs_info->btree_inode)->dummy_inode = 1;
c65ddb52 1700 insert_inode_hash(fs_info->btree_inode);
76dda93c 1701
0f9dd46c 1702 spin_lock_init(&fs_info->block_group_cache_lock);
6bef4d31 1703 fs_info->block_group_cache_tree = RB_ROOT;
0f9dd46c 1704
11833d66 1705 extent_io_tree_init(&fs_info->freed_extents[0],
f993c883 1706 fs_info->btree_inode->i_mapping);
11833d66 1707 extent_io_tree_init(&fs_info->freed_extents[1],
f993c883 1708 fs_info->btree_inode->i_mapping);
11833d66 1709 fs_info->pinned_extents = &fs_info->freed_extents[0];
e66f709b 1710 fs_info->do_barriers = 1;
e18e4809 1711
39279cc3 1712
5a3f23d5 1713 mutex_init(&fs_info->ordered_operations_mutex);
e02119d5 1714 mutex_init(&fs_info->tree_log_mutex);
925baedd 1715 mutex_init(&fs_info->chunk_mutex);
a74a4b97
CM		 1716 mutex_init(&fs_info->transaction_kthread_mutex);
1717 mutex_init(&fs_info->cleaner_mutex);
7d9eb12c 1718 mutex_init(&fs_info->volume_mutex);
276e680d 1719 init_rwsem(&fs_info->extent_commit_sem);
c71bf099 1720 init_rwsem(&fs_info->cleanup_work_sem);
76dda93c 1721 init_rwsem(&fs_info->subvol_sem);
fa9c0d79
CM		 1722
1723 btrfs_init_free_cluster(&fs_info->meta_alloc_cluster);
1724 btrfs_init_free_cluster(&fs_info->data_alloc_cluster);
1725
e6dcd2dc 1726 init_waitqueue_head(&fs_info->transaction_throttle);
f9295749 1727 init_waitqueue_head(&fs_info->transaction_wait);
bb9c12c9 1728 init_waitqueue_head(&fs_info->transaction_blocked_wait);
4854ddd0 1729 init_waitqueue_head(&fs_info->async_submit_wait);
3768f368 1730
0b86a832 1731 __setup_root(4096, 4096, 4096, 4096, tree_root,
2c90e5d6 1732 fs_info, BTRFS_ROOT_TREE_OBJECTID);
7eccb903 1733
a512bbf8 1734 bh = btrfs_read_dev_super(fs_devices->latest_bdev);
20b45077
DY		 1735 if (!bh) {
1736 err = -EINVAL;
16cdcec7 1737 goto fail_alloc;
20b45077 1738 }
39279cc3 1739
a061fc8d 1740 memcpy(&fs_info->super_copy, bh->b_data, sizeof(fs_info->super_copy));
2d69a0f8
YZ		 1741 memcpy(&fs_info->super_for_commit, &fs_info->super_copy,
1742 sizeof(fs_info->super_for_commit));
a061fc8d 1743 brelse(bh);
5f39d397 1744
a061fc8d 1745 memcpy(fs_info->fsid, fs_info->super_copy.fsid, BTRFS_FSID_SIZE);
0b86a832 1746
5f39d397 1747 disk_super = &fs_info->super_copy;
0f7d52f4 1748 if (!btrfs_super_root(disk_super))
16cdcec7 1749 goto fail_alloc;
0f7d52f4 1750
acce952b 1751 /* check FS state, whether FS is broken. */
1752 fs_info->fs_state |= btrfs_super_flags(disk_super);
1753
1754 btrfs_check_super_valid(fs_info, sb->s_flags & MS_RDONLY);
1755
75e7cb7f
LB		 1756 /*
1757 * In the long term, we'll store the compression type in the super
1758 * block, and it'll be used for per file compression control.
1759 */
1760 fs_info->compress_type = BTRFS_COMPRESS_ZLIB;
1761
2b82032c
YZ		 1762 ret = btrfs_parse_options(tree_root, options);
1763 if (ret) {
1764 err = ret;
16cdcec7 1765 goto fail_alloc;
2b82032c 1766 }
dfe25020 1767
f2b636e8
JB		 1768 features = btrfs_super_incompat_flags(disk_super) &
1769 ~BTRFS_FEATURE_INCOMPAT_SUPP;
1770 if (features) {
1771 printk(KERN_ERR "BTRFS: couldn't mount because of "
1772 "unsupported optional features (%Lx).\n",
21380931 1773 (unsigned long long)features);
f2b636e8 1774 err = -EINVAL;
16cdcec7 1775 goto fail_alloc;
f2b636e8
JB		 1776 }
1777
5d4f98a2 1778 features = btrfs_super_incompat_flags(disk_super);
a6fa6fae
LZ		 1779 features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
1780 if (tree_root->fs_info->compress_type & BTRFS_COMPRESS_LZO)
1781 features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO;
1782 btrfs_set_super_incompat_flags(disk_super, features);
5d4f98a2 1783
f2b636e8
JB		 1784 features = btrfs_super_compat_ro_flags(disk_super) &
1785 ~BTRFS_FEATURE_COMPAT_RO_SUPP;
1786 if (!(sb->s_flags & MS_RDONLY) && features) {
1787 printk(KERN_ERR "BTRFS: couldn't mount RDWR because of "
1788 "unsupported option features (%Lx).\n",
21380931 1789 (unsigned long long)features);
f2b636e8 1790 err = -EINVAL;
16cdcec7 1791 goto fail_alloc;
f2b636e8 1792 }
61d92c32
CM		 1793
1794 btrfs_init_workers(&fs_info->generic_worker,
1795 "genwork", 1, NULL);
1796
5443be45 1797 btrfs_init_workers(&fs_info->workers, "worker",
61d92c32
CM		 1798 fs_info->thread_pool_size,
1799 &fs_info->generic_worker);
c8b97818 1800
771ed689 1801 btrfs_init_workers(&fs_info->delalloc_workers, "delalloc",
61d92c32
CM		 1802 fs_info->thread_pool_size,
1803 &fs_info->generic_worker);
771ed689 1804
5443be45 1805 btrfs_init_workers(&fs_info->submit_workers, "submit",
b720d209 1806 min_t(u64, fs_devices->num_devices,
61d92c32
CM		 1807 fs_info->thread_pool_size),
1808 &fs_info->generic_worker);
61b49440 1809
bab39bf9
JB		 1810 btrfs_init_workers(&fs_info->caching_workers, "cache",
1811 2, &fs_info->generic_worker);
1812
61b49440
CM		 1813 /* a higher idle thresh on the submit workers makes it much more
1814 * likely that bios will be send down in a sane order to the
1815 * devices
1816 */
1817 fs_info->submit_workers.idle_thresh = 64;
53863232 1818
771ed689 1819 fs_info->workers.idle_thresh = 16;
4a69a410 1820 fs_info->workers.ordered = 1;
61b49440 1821
771ed689
CM		 1822 fs_info->delalloc_workers.idle_thresh = 2;
1823 fs_info->delalloc_workers.ordered = 1;
1824
61d92c32
CM		 1825 btrfs_init_workers(&fs_info->fixup_workers, "fixup", 1,
1826 &fs_info->generic_worker);
5443be45 1827 btrfs_init_workers(&fs_info->endio_workers, "endio",
61d92c32
CM		 1828 fs_info->thread_pool_size,
1829 &fs_info->generic_worker);
d20f7043 1830 btrfs_init_workers(&fs_info->endio_meta_workers, "endio-meta",
61d92c32
CM		 1831 fs_info->thread_pool_size,
1832 &fs_info->generic_worker);
cad321ad 1833 btrfs_init_workers(&fs_info->endio_meta_write_workers,
61d92c32
CM		 1834 "endio-meta-write", fs_info->thread_pool_size,
1835 &fs_info->generic_worker);
5443be45 1836 btrfs_init_workers(&fs_info->endio_write_workers, "endio-write",
61d92c32
CM		 1837 fs_info->thread_pool_size,
1838 &fs_info->generic_worker);
0cb59c99
JB		 1839 btrfs_init_workers(&fs_info->endio_freespace_worker, "freespace-write",
1840 1, &fs_info->generic_worker);
16cdcec7
MX		 1841 btrfs_init_workers(&fs_info->delayed_workers, "delayed-meta",
1842 fs_info->thread_pool_size,
1843 &fs_info->generic_worker);
61b49440
CM		 1844
1845 /*
1846 * endios are largely parallel and should have a very
1847 * low idle thresh
1848 */
1849 fs_info->endio_workers.idle_thresh = 4;
b51912c9
CM		 1850 fs_info->endio_meta_workers.idle_thresh = 4;
1851
9042846b
CM		 1852 fs_info->endio_write_workers.idle_thresh = 2;
1853 fs_info->endio_meta_write_workers.idle_thresh = 2;
1854
4543df7e 1855 btrfs_start_workers(&fs_info->workers, 1);
61d92c32 1856 btrfs_start_workers(&fs_info->generic_worker, 1);
1cc127b5 1857 btrfs_start_workers(&fs_info->submit_workers, 1);
771ed689 1858 btrfs_start_workers(&fs_info->delalloc_workers, 1);
247e743c 1859 btrfs_start_workers(&fs_info->fixup_workers, 1);
9042846b
CM		 1860 btrfs_start_workers(&fs_info->endio_workers, 1);
1861 btrfs_start_workers(&fs_info->endio_meta_workers, 1);
1862 btrfs_start_workers(&fs_info->endio_meta_write_workers, 1);
1863 btrfs_start_workers(&fs_info->endio_write_workers, 1);
0cb59c99 1864 btrfs_start_workers(&fs_info->endio_freespace_worker, 1);
16cdcec7 1865 btrfs_start_workers(&fs_info->delayed_workers, 1);
bab39bf9 1866 btrfs_start_workers(&fs_info->caching_workers, 1);
4543df7e 1867
4575c9cc 1868 fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super);
c8b97818
CM		 1869 fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages,
1870 4 * 1024 * 1024 / PAGE_CACHE_SIZE);
4575c9cc 1871
db94535d
CM		 1872 nodesize = btrfs_super_nodesize(disk_super);
1873 leafsize = btrfs_super_leafsize(disk_super);
1874 sectorsize = btrfs_super_sectorsize(disk_super);
87ee04eb 1875 stripesize = btrfs_super_stripesize(disk_super);
db94535d
CM		 1876 tree_root->nodesize = nodesize;
1877 tree_root->leafsize = leafsize;
1878 tree_root->sectorsize = sectorsize;
87ee04eb 1879 tree_root->stripesize = stripesize;
a061fc8d
CM		 1880
1881 sb->s_blocksize = sectorsize;
1882 sb->s_blocksize_bits = blksize_bits(sectorsize);
db94535d 1883
39279cc3
CM		 1884 if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
1885 sizeof(disk_super->magic))) {
d397712b 1886 printk(KERN_INFO "btrfs: valid FS not found on %s\n", sb->s_id);
39279cc3
CM		 1887 goto fail_sb_buffer;
1888 }
19c00ddc 1889
925baedd 1890 mutex_lock(&fs_info->chunk_mutex);
e4404d6e 1891 ret = btrfs_read_sys_array(tree_root);
925baedd 1892 mutex_unlock(&fs_info->chunk_mutex);
84eed90f 1893 if (ret) {
d397712b
CM		 1894 printk(KERN_WARNING "btrfs: failed to read the system "
1895 "array on %s\n", sb->s_id);
5d4f98a2 1896 goto fail_sb_buffer;
84eed90f 1897 }
0b86a832
CM		 1898
1899 blocksize = btrfs_level_size(tree_root,
1900 btrfs_super_chunk_root_level(disk_super));
84234f3a 1901 generation = btrfs_super_chunk_root_generation(disk_super);
0b86a832
CM		 1902
1903 __setup_root(nodesize, leafsize, sectorsize, stripesize,
1904 chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
1905
1906 chunk_root->node = read_tree_block(chunk_root,
1907 btrfs_super_chunk_root(disk_super),
84234f3a 1908 blocksize, generation);
0b86a832 1909 BUG_ON(!chunk_root->node);
83121942
DW		 1910 if (!test_bit(EXTENT_BUFFER_UPTODATE, &chunk_root->node->bflags)) {
1911 printk(KERN_WARNING "btrfs: failed to read chunk root on %s\n",
1912 sb->s_id);
1913 goto fail_chunk_root;
1914 }
5d4f98a2
YZ		 1915 btrfs_set_root_node(&chunk_root->root_item, chunk_root->node);
1916 chunk_root->commit_root = btrfs_root_node(chunk_root);
0b86a832 1917
e17cade2 1918 read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
d397712b
CM		 1919 (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node),
1920 BTRFS_UUID_SIZE);
e17cade2 1921
925baedd 1922 mutex_lock(&fs_info->chunk_mutex);
0b86a832 1923 ret = btrfs_read_chunk_tree(chunk_root);
925baedd 1924 mutex_unlock(&fs_info->chunk_mutex);
2b82032c 1925 if (ret) {
d397712b
CM		 1926 printk(KERN_WARNING "btrfs: failed to read chunk tree on %s\n",
1927 sb->s_id);
2b82032c
YZ		 1928 goto fail_chunk_root;
1929 }
0b86a832 1930
dfe25020
CM		 1931 btrfs_close_extra_devices(fs_devices);
1932
db94535d
CM		 1933 blocksize = btrfs_level_size(tree_root,
1934 btrfs_super_root_level(disk_super));
84234f3a 1935 generation = btrfs_super_generation(disk_super);
0b86a832 1936
e20d96d6 1937 tree_root->node = read_tree_block(tree_root,
db94535d 1938 btrfs_super_root(disk_super),
84234f3a 1939 blocksize, generation);
39279cc3 1940 if (!tree_root->node)
2b82032c 1941 goto fail_chunk_root;
83121942
DW		 1942 if (!test_bit(EXTENT_BUFFER_UPTODATE, &tree_root->node->bflags)) {
1943 printk(KERN_WARNING "btrfs: failed to read tree root on %s\n",
1944 sb->s_id);
1945 goto fail_tree_root;
1946 }
5d4f98a2
YZ		 1947 btrfs_set_root_node(&tree_root->root_item, tree_root->node);
1948 tree_root->commit_root = btrfs_root_node(tree_root);
db94535d
CM		 1949
1950 ret = find_and_setup_root(tree_root, fs_info,
e20d96d6 1951 BTRFS_EXTENT_TREE_OBJECTID, extent_root);
0b86a832 1952 if (ret)
39279cc3 1953 goto fail_tree_root;
0b86a832
CM		 1954 extent_root->track_dirty = 1;
1955
1956 ret = find_and_setup_root(tree_root, fs_info,
1957 BTRFS_DEV_TREE_OBJECTID, dev_root);
0b86a832
CM		 1958 if (ret)
1959 goto fail_extent_root;
5d4f98a2 1960 dev_root->track_dirty = 1;
3768f368 1961
d20f7043
CM		 1962 ret = find_and_setup_root(tree_root, fs_info,
1963 BTRFS_CSUM_TREE_OBJECTID, csum_root);
1964 if (ret)
5d4f98a2 1965 goto fail_dev_root;
d20f7043
CM		 1966
1967 csum_root->track_dirty = 1;
1968
8929ecfa
YZ		 1969 fs_info->generation = generation;
1970 fs_info->last_trans_committed = generation;
1971 fs_info->data_alloc_profile = (u64)-1;
1972 fs_info->metadata_alloc_profile = (u64)-1;
1973 fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
1974
c59021f8 1975 ret = btrfs_init_space_info(fs_info);
1976 if (ret) {
1977 printk(KERN_ERR "Failed to initial space info: %d\n", ret);
1978 goto fail_block_groups;
1979 }
1980
1b1d1f66
JB		 1981 ret = btrfs_read_block_groups(extent_root);
1982 if (ret) {
1983 printk(KERN_ERR "Failed to read block groups: %d\n", ret);
1984 goto fail_block_groups;
1985 }
9078a3e1 1986
a74a4b97
CM		 1987 fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root,
1988 "btrfs-cleaner");
57506d50 1989 if (IS_ERR(fs_info->cleaner_kthread))
1b1d1f66 1990 goto fail_block_groups;
a74a4b97
CM		 1991
1992 fs_info->transaction_kthread = kthread_run(transaction_kthread,
1993 tree_root,
1994 "btrfs-transaction");
57506d50 1995 if (IS_ERR(fs_info->transaction_kthread))
3f157a2f 1996 goto fail_cleaner;
a74a4b97 1997
c289811c
CM		 1998 if (!btrfs_test_opt(tree_root, SSD) &&
1999 !btrfs_test_opt(tree_root, NOSSD) &&
2000 !fs_info->fs_devices->rotating) {
2001 printk(KERN_INFO "Btrfs detected SSD devices, enabling SSD "
2002 "mode\n");
2003 btrfs_set_opt(fs_info->mount_opt, SSD);
2004 }
2005
acce952b 2006 /* do not make disk changes in broken FS */
2007 if (btrfs_super_log_root(disk_super) != 0 &&
2008 !(fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR)) {
e02119d5
CM		 2009 u64 bytenr = btrfs_super_log_root(disk_super);
2010
7c2ca468 2011 if (fs_devices->rw_devices == 0) {
d397712b
CM		 2012 printk(KERN_WARNING "Btrfs log replay required "
2013 "on RO media\n");
7c2ca468
CM		 2014 err = -EIO;
2015 goto fail_trans_kthread;
2016 }
e02119d5
CM		 2017 blocksize =
2018 btrfs_level_size(tree_root,
2019 btrfs_super_log_root_level(disk_super));
d18a2c44 2020
676e4c86
DC		 2021 log_tree_root = kzalloc(sizeof(struct btrfs_root), GFP_NOFS);
2022 if (!log_tree_root) {
2023 err = -ENOMEM;
2024 goto fail_trans_kthread;
2025 }
e02119d5
CM		 2026
2027 __setup_root(nodesize, leafsize, sectorsize, stripesize,
2028 log_tree_root, fs_info, BTRFS_TREE_LOG_OBJECTID);
2029
2030 log_tree_root->node = read_tree_block(tree_root, bytenr,
84234f3a
YZ		 2031 blocksize,
2032 generation + 1);
e02119d5
CM		 2033 ret = btrfs_recover_log_trees(log_tree_root);
2034 BUG_ON(ret);
e556ce2c
YZ		 2035
2036 if (sb->s_flags & MS_RDONLY) {
2037 ret = btrfs_commit_super(tree_root);
2038 BUG_ON(ret);
2039 }
e02119d5 2040 }
1a40e23b 2041
76dda93c
YZ		 2042 ret = btrfs_find_orphan_roots(tree_root);
2043 BUG_ON(ret);
2044
7c2ca468 2045 if (!(sb->s_flags & MS_RDONLY)) {
d68fc57b
YZ		 2046 ret = btrfs_cleanup_fs_roots(fs_info);
2047 BUG_ON(ret);
2048
5d4f98a2 2049 ret = btrfs_recover_relocation(tree_root);
d7ce5843
MX		 2050 if (ret < 0) {
2051 printk(KERN_WARNING
2052 "btrfs: failed to recover relocation\n");
2053 err = -EINVAL;
2054 goto fail_trans_kthread;
2055 }
7c2ca468 2056 }
1a40e23b 2057
3de4586c
CM		 2058 location.objectid = BTRFS_FS_TREE_OBJECTID;
2059 location.type = BTRFS_ROOT_ITEM_KEY;
2060 location.offset = (u64)-1;
2061
3de4586c
CM		 2062 fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location);
2063 if (!fs_info->fs_root)
7c2ca468 2064 goto fail_trans_kthread;
3140c9a3
DC		 2065 if (IS_ERR(fs_info->fs_root)) {
2066 err = PTR_ERR(fs_info->fs_root);
2067 goto fail_trans_kthread;
2068 }
c289811c 2069
e3acc2a6
JB		 2070 if (!(sb->s_flags & MS_RDONLY)) {
2071 down_read(&fs_info->cleanup_work_sem);
66b4ffd1
JB		 2072 err = btrfs_orphan_cleanup(fs_info->fs_root);
2073 if (!err)
2074 err = btrfs_orphan_cleanup(fs_info->tree_root);
e3acc2a6 2075 up_read(&fs_info->cleanup_work_sem);
66b4ffd1
JB		 2076 if (err) {
2077 close_ctree(tree_root);
2078 return ERR_PTR(err);
2079 }
e3acc2a6
JB		 2080 }
2081
0f7d52f4 2082 return tree_root;
39279cc3 2083
7c2ca468
CM		 2084fail_trans_kthread:
2085 kthread_stop(fs_info->transaction_kthread);
3f157a2f 2086fail_cleaner:
a74a4b97 2087 kthread_stop(fs_info->cleaner_kthread);
7c2ca468
CM		 2088
2089 /*
2090 * make sure we're done with the btree inode before we stop our
2091 * kthreads
2092 */
2093 filemap_write_and_wait(fs_info->btree_inode->i_mapping);
2094 invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
2095
1b1d1f66
JB		 2096fail_block_groups:
2097 btrfs_free_block_groups(fs_info);
d20f7043 2098 free_extent_buffer(csum_root->node);
5d4f98a2
YZ		 2099 free_extent_buffer(csum_root->commit_root);
2100fail_dev_root:
2101 free_extent_buffer(dev_root->node);
2102 free_extent_buffer(dev_root->commit_root);
0b86a832
CM		 2103fail_extent_root:
2104 free_extent_buffer(extent_root->node);
5d4f98a2 2105 free_extent_buffer(extent_root->commit_root);
39279cc3 2106fail_tree_root:
5f39d397 2107 free_extent_buffer(tree_root->node);
5d4f98a2 2108 free_extent_buffer(tree_root->commit_root);
2b82032c
YZ		 2109fail_chunk_root:
2110 free_extent_buffer(chunk_root->node);
5d4f98a2 2111 free_extent_buffer(chunk_root->commit_root);
39279cc3 2112fail_sb_buffer:
61d92c32 2113 btrfs_stop_workers(&fs_info->generic_worker);
247e743c 2114 btrfs_stop_workers(&fs_info->fixup_workers);
771ed689 2115 btrfs_stop_workers(&fs_info->delalloc_workers);
8b712842
CM		 2116 btrfs_stop_workers(&fs_info->workers);
2117 btrfs_stop_workers(&fs_info->endio_workers);
d20f7043 2118 btrfs_stop_workers(&fs_info->endio_meta_workers);
cad321ad 2119 btrfs_stop_workers(&fs_info->endio_meta_write_workers);
e6dcd2dc 2120 btrfs_stop_workers(&fs_info->endio_write_workers);
0cb59c99 2121 btrfs_stop_workers(&fs_info->endio_freespace_worker);
1cc127b5 2122 btrfs_stop_workers(&fs_info->submit_workers);
16cdcec7 2123 btrfs_stop_workers(&fs_info->delayed_workers);
bab39bf9 2124 btrfs_stop_workers(&fs_info->caching_workers);
16cdcec7
MX		 2125fail_alloc:
2126 kfree(fs_info->delayed_root);
4543df7e 2127fail_iput:
7c2ca468 2128 invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
4543df7e 2129 iput(fs_info->btree_inode);
7e662854 2130
dfe25020 2131 btrfs_close_devices(fs_info->fs_devices);
84eed90f 2132 btrfs_mapping_tree_free(&fs_info->mapping_tree);
ad081f14 2133fail_bdi:
7e662854 2134 bdi_destroy(&fs_info->bdi);
76dda93c
YZ		 2135fail_srcu:
2136 cleanup_srcu_struct(&fs_info->subvol_srcu);
7e662854 2137fail:
39279cc3
CM		 2138 kfree(extent_root);
2139 kfree(tree_root);
2140 kfree(fs_info);
83afeac4
JM		 2141 kfree(chunk_root);
2142 kfree(dev_root);
d20f7043 2143 kfree(csum_root);
39279cc3 2144 return ERR_PTR(err);
eb60ceac
CM		 2145}
2146
f2984462
CM		 2147static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate)
2148{
2149 char b[BDEVNAME_SIZE];
2150
2151 if (uptodate) {
2152 set_buffer_uptodate(bh);
2153 } else {
7a36ddec 2154 printk_ratelimited(KERN_WARNING "lost page write due to "
f2984462
CM		 2155 "I/O error on %s\n",
2156 bdevname(bh->b_bdev, b));
1259ab75
CM		 2157 /* note, we dont' set_buffer_write_io_error because we have
2158 * our own ways of dealing with the IO errors
2159 */
f2984462
CM		 2160 clear_buffer_uptodate(bh);
2161 }
2162 unlock_buffer(bh);
2163 put_bh(bh);
2164}
2165
a512bbf8
YZ		 2166struct buffer_head *btrfs_read_dev_super(struct block_device *bdev)
2167{
2168 struct buffer_head *bh;
2169 struct buffer_head *latest = NULL;
2170 struct btrfs_super_block *super;
2171 int i;
2172 u64 transid = 0;
2173 u64 bytenr;
2174
2175 /* we would like to check all the supers, but that would make
2176 * a btrfs mount succeed after a mkfs from a different FS.
2177 * So, we need to add a special mount option to scan for
2178 * later supers, using BTRFS_SUPER_MIRROR_MAX instead
2179 */
2180 for (i = 0; i < 1; i++) {
2181 bytenr = btrfs_sb_offset(i);
2182 if (bytenr + 4096 >= i_size_read(bdev->bd_inode))
2183 break;
2184 bh = __bread(bdev, bytenr / 4096, 4096);
2185 if (!bh)
2186 continue;
2187
2188 super = (struct btrfs_super_block *)bh->b_data;
2189 if (btrfs_super_bytenr(super) != bytenr ||
2190 strncmp((char *)(&super->magic), BTRFS_MAGIC,
2191 sizeof(super->magic))) {
2192 brelse(bh);
2193 continue;
2194 }
2195
2196 if (!latest || btrfs_super_generation(super) > transid) {
2197 brelse(latest);
2198 latest = bh;
2199 transid = btrfs_super_generation(super);
2200 } else {
2201 brelse(bh);
2202 }
2203 }
2204 return latest;
2205}
2206
4eedeb75
HH		 2207/*
2208 * this should be called twice, once with wait == 0 and
2209 * once with wait == 1. When wait == 0 is done, all the buffer heads
2210 * we write are pinned.
2211 *
2212 * They are released when wait == 1 is done.
2213 * max_mirrors must be the same for both runs, and it indicates how
2214 * many supers on this one device should be written.
2215 *
2216 * max_mirrors == 0 means to write them all.
2217 */
a512bbf8
YZ		 2218static int write_dev_supers(struct btrfs_device *device,
2219 struct btrfs_super_block *sb,
2220 int do_barriers, int wait, int max_mirrors)
2221{
2222 struct buffer_head *bh;
2223 int i;
2224 int ret;
2225 int errors = 0;
2226 u32 crc;
2227 u64 bytenr;
2228 int last_barrier = 0;
2229
2230 if (max_mirrors == 0)
2231 max_mirrors = BTRFS_SUPER_MIRROR_MAX;
2232
2233 /* make sure only the last submit_bh does a barrier */
2234 if (do_barriers) {
2235 for (i = 0; i < max_mirrors; i++) {
2236 bytenr = btrfs_sb_offset(i);
2237 if (bytenr + BTRFS_SUPER_INFO_SIZE >=
2238 device->total_bytes)
2239 break;
2240 last_barrier = i;
2241 }
2242 }
2243
2244 for (i = 0; i < max_mirrors; i++) {
2245 bytenr = btrfs_sb_offset(i);
2246 if (bytenr + BTRFS_SUPER_INFO_SIZE >= device->total_bytes)
2247 break;
2248
2249 if (wait) {
2250 bh = __find_get_block(device->bdev, bytenr / 4096,
2251 BTRFS_SUPER_INFO_SIZE);
2252 BUG_ON(!bh);
a512bbf8 2253 wait_on_buffer(bh);
4eedeb75
HH		 2254 if (!buffer_uptodate(bh))
2255 errors++;
2256
2257 /* drop our reference */
2258 brelse(bh);
2259
2260 /* drop the reference from the wait == 0 run */
2261 brelse(bh);
2262 continue;
a512bbf8
YZ		 2263 } else {
2264 btrfs_set_super_bytenr(sb, bytenr);
2265
2266 crc = ~(u32)0;
2267 crc = btrfs_csum_data(NULL, (char *)sb +
2268 BTRFS_CSUM_SIZE, crc,
2269 BTRFS_SUPER_INFO_SIZE -
2270 BTRFS_CSUM_SIZE);
2271 btrfs_csum_final(crc, sb->csum);
2272
4eedeb75
HH		 2273 /*
2274 * one reference for us, and we leave it for the
2275 * caller
2276 */
a512bbf8
YZ		 2277 bh = __getblk(device->bdev, bytenr / 4096,
2278 BTRFS_SUPER_INFO_SIZE);
2279 memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE);
2280
4eedeb75 2281 /* one reference for submit_bh */
a512bbf8 2282 get_bh(bh);
4eedeb75
HH		 2283
2284 set_buffer_uptodate(bh);
a512bbf8
YZ		 2285 lock_buffer(bh);
2286 bh->b_end_io = btrfs_end_buffer_write_sync;
2287 }
2288
c3b9a62c
CH		 2289 if (i == last_barrier && do_barriers)
2290 ret = submit_bh(WRITE_FLUSH_FUA, bh);
2291 else
ffbd517d 2292 ret = submit_bh(WRITE_SYNC, bh);
a512bbf8 2293
4eedeb75 2294 if (ret)
a512bbf8 2295 errors++;
a512bbf8
YZ		 2296 }
2297 return errors < i ? 0 : -1;
2298}
2299
2300int write_all_supers(struct btrfs_root *root, int max_mirrors)
f2984462 2301{
e5e9a520 2302 struct list_head *head;
f2984462 2303 struct btrfs_device *dev;
a061fc8d 2304 struct btrfs_super_block *sb;
f2984462 2305 struct btrfs_dev_item *dev_item;
f2984462
CM		 2306 int ret;
2307 int do_barriers;
a236aed1
CM		 2308 int max_errors;
2309 int total_errors = 0;
a061fc8d 2310 u64 flags;
f2984462 2311
a236aed1 2312 max_errors = btrfs_super_num_devices(&root->fs_info->super_copy) - 1;
f2984462
CM		 2313 do_barriers = !btrfs_test_opt(root, NOBARRIER);
2314
a061fc8d
CM		 2315 sb = &root->fs_info->super_for_commit;
2316 dev_item = &sb->dev_item;
e5e9a520 2317
174ba509 2318 mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
e5e9a520 2319 head = &root->fs_info->fs_devices->devices;
1f78160c 2320 list_for_each_entry_rcu(dev, head, dev_list) {
dfe25020
CM		 2321 if (!dev->bdev) {
2322 total_errors++;
2323 continue;
2324 }
2b82032c 2325 if (!dev->in_fs_metadata || !dev->writeable)
dfe25020
CM		 2326 continue;
2327
2b82032c 2328 btrfs_set_stack_device_generation(dev_item, 0);
a061fc8d
CM		 2329 btrfs_set_stack_device_type(dev_item, dev->type);
2330 btrfs_set_stack_device_id(dev_item, dev->devid);
2331 btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes);
2332 btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used);
2333 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
2334 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
2335 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
2336 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
2b82032c 2337 memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
a512bbf8 2338
a061fc8d
CM		 2339 flags = btrfs_super_flags(sb);
2340 btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
2341
a512bbf8 2342 ret = write_dev_supers(dev, sb, do_barriers, 0, max_mirrors);
a236aed1
CM		 2343 if (ret)
2344 total_errors++;
f2984462 2345 }
a236aed1 2346 if (total_errors > max_errors) {
d397712b
CM		 2347 printk(KERN_ERR "btrfs: %d errors while writing supers\n",
2348 total_errors);
a236aed1
CM		 2349 BUG();
2350 }
f2984462 2351
a512bbf8 2352 total_errors = 0;
1f78160c 2353 list_for_each_entry_rcu(dev, head, dev_list) {
dfe25020
CM		 2354 if (!dev->bdev)
2355 continue;
2b82032c 2356 if (!dev->in_fs_metadata || !dev->writeable)
dfe25020
CM		 2357 continue;
2358
a512bbf8
YZ		 2359 ret = write_dev_supers(dev, sb, do_barriers, 1, max_mirrors);
2360 if (ret)
2361 total_errors++;
f2984462 2362 }
174ba509 2363 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
a236aed1 2364 if (total_errors > max_errors) {
d397712b
CM		 2365 printk(KERN_ERR "btrfs: %d errors while writing supers\n",
2366 total_errors);
a236aed1
CM		 2367 BUG();
2368 }
f2984462
CM		 2369 return 0;
2370}
2371
a512bbf8
YZ		 2372int write_ctree_super(struct btrfs_trans_handle *trans,
2373 struct btrfs_root *root, int max_mirrors)
eb60ceac 2374{
e66f709b 2375 int ret;
5f39d397 2376
a512bbf8 2377 ret = write_all_supers(root, max_mirrors);
5f39d397 2378 return ret;
cfaa7295
CM		 2379}
2380
5eda7b5e 2381int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
2619ba1f 2382{
4df27c4d 2383 spin_lock(&fs_info->fs_roots_radix_lock);
2619ba1f
CM		 2384 radix_tree_delete(&fs_info->fs_roots_radix,
2385 (unsigned long)root->root_key.objectid);
4df27c4d 2386 spin_unlock(&fs_info->fs_roots_radix_lock);
76dda93c
YZ		 2387
2388 if (btrfs_root_refs(&root->root_item) == 0)
2389 synchronize_srcu(&fs_info->subvol_srcu);
2390
581bb050
LZ		 2391 __btrfs_remove_free_space_cache(root->free_ino_pinned);
2392 __btrfs_remove_free_space_cache(root->free_ino_ctl);
4df27c4d
YZ		 2393 free_fs_root(root);
2394 return 0;
2395}
2396
2397static void free_fs_root(struct btrfs_root *root)
2398{
82d5902d 2399 iput(root->cache_inode);
4df27c4d 2400 WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree));
3394e160
CM		 2401 if (root->anon_super.s_dev) {
2402 down_write(&root->anon_super.s_umount);
2403 kill_anon_super(&root->anon_super);
2404 }
4df27c4d
YZ		 2405 free_extent_buffer(root->node);
2406 free_extent_buffer(root->commit_root);
581bb050
LZ		 2407 kfree(root->free_ino_ctl);
2408 kfree(root->free_ino_pinned);
d397712b 2409 kfree(root->name);
2619ba1f 2410 kfree(root);
2619ba1f
CM		 2411}
2412
35b7e476 2413static int del_fs_roots(struct btrfs_fs_info *fs_info)
0f7d52f4
CM		 2414{
2415 int ret;
2416 struct btrfs_root *gang[8];
2417 int i;
2418
76dda93c
YZ		 2419 while (!list_empty(&fs_info->dead_roots)) {
2420 gang[0] = list_entry(fs_info->dead_roots.next,
2421 struct btrfs_root, root_list);
2422 list_del(&gang[0]->root_list);
2423
2424 if (gang[0]->in_radix) {
2425 btrfs_free_fs_root(fs_info, gang[0]);
2426 } else {
2427 free_extent_buffer(gang[0]->node);
2428 free_extent_buffer(gang[0]->commit_root);
2429 kfree(gang[0]);
2430 }
2431 }
2432
d397712b 2433 while (1) {
0f7d52f4
CM		 2434 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
2435 (void **)gang, 0,
2436 ARRAY_SIZE(gang));
2437 if (!ret)
2438 break;
2619ba1f 2439 for (i = 0; i < ret; i++)
5eda7b5e 2440 btrfs_free_fs_root(fs_info, gang[i]);
0f7d52f4
CM		 2441 }
2442 return 0;
2443}
b4100d64 2444
c146afad 2445int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info)
cfaa7295 2446{
c146afad
YZ		 2447 u64 root_objectid = 0;
2448 struct btrfs_root *gang[8];
2449 int i;
3768f368 2450 int ret;
e089f05c 2451
c146afad
YZ		 2452 while (1) {
2453 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
2454 (void **)gang, root_objectid,
2455 ARRAY_SIZE(gang));
2456 if (!ret)
2457 break;
5d4f98a2
YZ		 2458
2459 root_objectid = gang[ret - 1]->root_key.objectid + 1;
c146afad 2460 for (i = 0; i < ret; i++) {
66b4ffd1
JB		 2461 int err;
2462
c146afad 2463 root_objectid = gang[i]->root_key.objectid;
66b4ffd1
JB		 2464 err = btrfs_orphan_cleanup(gang[i]);
2465 if (err)
2466 return err;
c146afad
YZ		 2467 }
2468 root_objectid++;
2469 }
2470 return 0;
2471}
a2135011 2472
c146afad
YZ		 2473int btrfs_commit_super(struct btrfs_root *root)
2474{
2475 struct btrfs_trans_handle *trans;
2476 int ret;
a74a4b97 2477
c146afad 2478 mutex_lock(&root->fs_info->cleaner_mutex);
24bbcf04 2479 btrfs_run_delayed_iputs(root);
a74a4b97 2480 btrfs_clean_old_snapshots(root);
c146afad 2481 mutex_unlock(&root->fs_info->cleaner_mutex);
c71bf099
YZ		 2482
2483 /* wait until ongoing cleanup work done */
2484 down_write(&root->fs_info->cleanup_work_sem);
2485 up_write(&root->fs_info->cleanup_work_sem);
2486
7a7eaa40 2487 trans = btrfs_join_transaction(root);
3612b495
TI		 2488 if (IS_ERR(trans))
2489 return PTR_ERR(trans);
54aa1f4d 2490 ret = btrfs_commit_transaction(trans, root);
c146afad
YZ		 2491 BUG_ON(ret);
2492 /* run commit again to drop the original snapshot */
7a7eaa40 2493 trans = btrfs_join_transaction(root);
3612b495
TI		 2494 if (IS_ERR(trans))
2495 return PTR_ERR(trans);
79154b1b
CM		 2496 btrfs_commit_transaction(trans, root);
2497 ret = btrfs_write_and_wait_transaction(NULL, root);
3768f368 2498 BUG_ON(ret);
d6bfde87 2499
a512bbf8 2500 ret = write_ctree_super(NULL, root, 0);
c146afad
YZ		 2501 return ret;
2502}
2503
2504int close_ctree(struct btrfs_root *root)
2505{
2506 struct btrfs_fs_info *fs_info = root->fs_info;
2507 int ret;
2508
2509 fs_info->closing = 1;
2510 smp_mb();
2511
a2de733c 2512 btrfs_scrub_cancel(root);
4cb5300b
CM		 2513
2514 /* wait for any defraggers to finish */
2515 wait_event(fs_info->transaction_wait,
2516 (atomic_read(&fs_info->defrag_running) == 0));
2517
2518 /* clear out the rbtree of defraggable inodes */
2519 btrfs_run_defrag_inodes(root->fs_info);
2520
0af3d00b 2521 btrfs_put_block_group_cache(fs_info);
acce952b 2522
2523 /*
2524 * Here come 2 situations when btrfs is broken to flip readonly:
2525 *
2526 * 1. when btrfs flips readonly somewhere else before
2527 * btrfs_commit_super, sb->s_flags has MS_RDONLY flag,
2528 * and btrfs will skip to write sb directly to keep
2529 * ERROR state on disk.
2530 *
2531 * 2. when btrfs flips readonly just in btrfs_commit_super,
ae0e47f0 2532 * and in such case, btrfs cannot write sb via btrfs_commit_super,
acce952b 2533 * and since fs_state has been set BTRFS_SUPER_FLAG_ERROR flag,
2534 * btrfs will cleanup all FS resources first and write sb then.
2535 */
c146afad 2536 if (!(fs_info->sb->s_flags & MS_RDONLY)) {
acce952b 2537 ret = btrfs_commit_super(root);
2538 if (ret)
2539 printk(KERN_ERR "btrfs: commit super ret %d\n", ret);
2540 }
2541
2542 if (fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) {
2543 ret = btrfs_error_commit_super(root);
d397712b
CM		 2544 if (ret)
2545 printk(KERN_ERR "btrfs: commit super ret %d\n", ret);
c146afad 2546 }
0f7d52f4 2547
8929ecfa
YZ		 2548 kthread_stop(root->fs_info->transaction_kthread);
2549 kthread_stop(root->fs_info->cleaner_kthread);
2550
f25784b3
YZ		 2551 fs_info->closing = 2;
2552 smp_mb();
2553
b0c68f8b 2554 if (fs_info->delalloc_bytes) {
d397712b 2555 printk(KERN_INFO "btrfs: at unmount delalloc count %llu\n",
21380931 2556 (unsigned long long)fs_info->delalloc_bytes);
b0c68f8b 2557 }
31153d81 2558 if (fs_info->total_ref_cache_size) {
d397712b
CM		 2559 printk(KERN_INFO "btrfs: at umount reference cache size %llu\n",
2560 (unsigned long long)fs_info->total_ref_cache_size);
31153d81 2561 }
bcc63abb 2562
5d4f98a2
YZ		 2563 free_extent_buffer(fs_info->extent_root->node);
2564 free_extent_buffer(fs_info->extent_root->commit_root);
2565 free_extent_buffer(fs_info->tree_root->node);
2566 free_extent_buffer(fs_info->tree_root->commit_root);
2567 free_extent_buffer(root->fs_info->chunk_root->node);
2568 free_extent_buffer(root->fs_info->chunk_root->commit_root);
2569 free_extent_buffer(root->fs_info->dev_root->node);
2570 free_extent_buffer(root->fs_info->dev_root->commit_root);
2571 free_extent_buffer(root->fs_info->csum_root->node);
2572 free_extent_buffer(root->fs_info->csum_root->commit_root);
d20f7043 2573
9078a3e1 2574 btrfs_free_block_groups(root->fs_info);
d10c5f31 2575
c146afad 2576 del_fs_roots(fs_info);
d10c5f31 2577
c146afad 2578 iput(fs_info->btree_inode);
16cdcec7 2579 kfree(fs_info->delayed_root);
9ad6b7bc 2580
61d92c32 2581 btrfs_stop_workers(&fs_info->generic_worker);
247e743c 2582 btrfs_stop_workers(&fs_info->fixup_workers);
771ed689 2583 btrfs_stop_workers(&fs_info->delalloc_workers);
8b712842
CM		 2584 btrfs_stop_workers(&fs_info->workers);
2585 btrfs_stop_workers(&fs_info->endio_workers);
d20f7043 2586 btrfs_stop_workers(&fs_info->endio_meta_workers);
cad321ad 2587 btrfs_stop_workers(&fs_info->endio_meta_write_workers);
e6dcd2dc 2588 btrfs_stop_workers(&fs_info->endio_write_workers);
0cb59c99 2589 btrfs_stop_workers(&fs_info->endio_freespace_worker);
1cc127b5 2590 btrfs_stop_workers(&fs_info->submit_workers);
16cdcec7 2591 btrfs_stop_workers(&fs_info->delayed_workers);
bab39bf9 2592 btrfs_stop_workers(&fs_info->caching_workers);
d6bfde87 2593
dfe25020 2594 btrfs_close_devices(fs_info->fs_devices);
0b86a832 2595 btrfs_mapping_tree_free(&fs_info->mapping_tree);
b248a415 2596
04160088 2597 bdi_destroy(&fs_info->bdi);
76dda93c 2598 cleanup_srcu_struct(&fs_info->subvol_srcu);
0b86a832 2599
0f7d52f4 2600 kfree(fs_info->extent_root);
0f7d52f4 2601 kfree(fs_info->tree_root);
0b86a832
CM		 2602 kfree(fs_info->chunk_root);
2603 kfree(fs_info->dev_root);
d20f7043 2604 kfree(fs_info->csum_root);
83a4d548
LZ		 2605 kfree(fs_info);
2606
eb60ceac
CM		 2607 return 0;
2608}
2609
1259ab75 2610int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
5f39d397 2611{
1259ab75 2612 int ret;
810191ff 2613 struct inode *btree_inode = buf->first_page->mapping->host;
1259ab75 2614
2ac55d41
JB		 2615 ret = extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, buf,
2616 NULL);
1259ab75
CM		 2617 if (!ret)
2618 return ret;
2619
2620 ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf,
2621 parent_transid);
2622 return !ret;
5f39d397
CM		 2623}
2624
2625int btrfs_set_buffer_uptodate(struct extent_buffer *buf)
ccd467d6 2626{
810191ff 2627 struct inode *btree_inode = buf->first_page->mapping->host;
d1310b2e 2628 return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree,
5f39d397
CM		 2629 buf);
2630}
6702ed49 2631
5f39d397
CM		 2632void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
2633{
810191ff 2634 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
5f39d397
CM		 2635 u64 transid = btrfs_header_generation(buf);
2636 struct inode *btree_inode = root->fs_info->btree_inode;
b9473439 2637 int was_dirty;
b4ce94de 2638
b9447ef8 2639 btrfs_assert_tree_locked(buf);
ccd467d6 2640 if (transid != root->fs_info->generation) {
d397712b
CM		 2641 printk(KERN_CRIT "btrfs transid mismatch buffer %llu, "
2642 "found %llu running %llu\n",
db94535d 2643 (unsigned long long)buf->start,
d397712b
CM		 2644 (unsigned long long)transid,
2645 (unsigned long long)root->fs_info->generation);
ccd467d6
CM		 2646 WARN_ON(1);
2647 }
b9473439
CM		 2648 was_dirty = set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree,
2649 buf);
2650 if (!was_dirty) {
2651 spin_lock(&root->fs_info->delalloc_lock);
2652 root->fs_info->dirty_metadata_bytes += buf->len;
2653 spin_unlock(&root->fs_info->delalloc_lock);
2654 }
eb60ceac
CM		 2655}
2656
d3c2fdcf 2657void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
16cdcec7
MX		 2658{
2659 /*
2660 * looks as though older kernels can get into trouble with
2661 * this code, they end up stuck in balance_dirty_pages forever
2662 */
2663 u64 num_dirty;
2664 unsigned long thresh = 32 * 1024 * 1024;
2665
2666 if (current->flags & PF_MEMALLOC)
2667 return;
2668
2669 btrfs_balance_delayed_items(root);
2670
2671 num_dirty = root->fs_info->dirty_metadata_bytes;
2672
2673 if (num_dirty > thresh) {
2674 balance_dirty_pages_ratelimited_nr(
2675 root->fs_info->btree_inode->i_mapping, 1);
2676 }
2677 return;
2678}
2679
2680void __btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
35b7e476 2681{
188de649
CM		 2682 /*
2683 * looks as though older kernels can get into trouble with
2684 * this code, they end up stuck in balance_dirty_pages forever
2685 */
d6bfde87 2686 u64 num_dirty;
771ed689 2687 unsigned long thresh = 32 * 1024 * 1024;
d6bfde87 2688
6933c02e 2689 if (current->flags & PF_MEMALLOC)
d6bfde87
CM		 2690 return;
2691
585ad2c3
CM		 2692 num_dirty = root->fs_info->dirty_metadata_bytes;
2693
d6bfde87
CM		 2694 if (num_dirty > thresh) {
2695 balance_dirty_pages_ratelimited_nr(
d7fc640e 2696 root->fs_info->btree_inode->i_mapping, 1);
d6bfde87 2697 }
188de649 2698 return;
35b7e476 2699}
6b80053d 2700
ca7a79ad 2701int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid)
6b80053d 2702{
810191ff 2703 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
ce9adaa5 2704 int ret;
ca7a79ad 2705 ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid);
d397712b 2706 if (ret == 0)
b4ce94de 2707 set_bit(EXTENT_BUFFER_UPTODATE, &buf->bflags);
ce9adaa5 2708 return ret;
6b80053d 2709}
0da5468f 2710
4bef0848
CM		 2711int btree_lock_page_hook(struct page *page)
2712{
2713 struct inode *inode = page->mapping->host;
b9473439 2714 struct btrfs_root *root = BTRFS_I(inode)->root;
4bef0848
CM		 2715 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
2716 struct extent_buffer *eb;
2717 unsigned long len;
2718 u64 bytenr = page_offset(page);
2719
2720 if (page->private == EXTENT_PAGE_PRIVATE)
2721 goto out;
2722
2723 len = page->private >> 2;
f09d1f60 2724 eb = find_extent_buffer(io_tree, bytenr, len);
4bef0848
CM		 2725 if (!eb)
2726 goto out;
2727
2728 btrfs_tree_lock(eb);
4bef0848 2729 btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
b9473439
CM		 2730
2731 if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) {
2732 spin_lock(&root->fs_info->delalloc_lock);
2733 if (root->fs_info->dirty_metadata_bytes >= eb->len)
2734 root->fs_info->dirty_metadata_bytes -= eb->len;
2735 else
2736 WARN_ON(1);
2737 spin_unlock(&root->fs_info->delalloc_lock);
2738 }
2739
4bef0848
CM		 2740 btrfs_tree_unlock(eb);
2741 free_extent_buffer(eb);
2742out:
2743 lock_page(page);
2744 return 0;
2745}
2746
acce952b 2747static void btrfs_check_super_valid(struct btrfs_fs_info *fs_info,
2748 int read_only)
2749{
2750 if (read_only)
2751 return;
2752
2753 if (fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR)
2754 printk(KERN_WARNING "warning: mount fs with errors, "
2755 "running btrfsck is recommended\n");
2756}
2757
2758int btrfs_error_commit_super(struct btrfs_root *root)
2759{
2760 int ret;
2761
2762 mutex_lock(&root->fs_info->cleaner_mutex);
2763 btrfs_run_delayed_iputs(root);
2764 mutex_unlock(&root->fs_info->cleaner_mutex);
2765
2766 down_write(&root->fs_info->cleanup_work_sem);
2767 up_write(&root->fs_info->cleanup_work_sem);
2768
2769 /* cleanup FS via transaction */
2770 btrfs_cleanup_transaction(root);
2771
2772 ret = write_ctree_super(NULL, root, 0);
2773
2774 return ret;
2775}
2776
2777static int btrfs_destroy_ordered_operations(struct btrfs_root *root)
2778{
2779 struct btrfs_inode *btrfs_inode;
2780 struct list_head splice;
2781
2782 INIT_LIST_HEAD(&splice);
2783
2784 mutex_lock(&root->fs_info->ordered_operations_mutex);
2785 spin_lock(&root->fs_info->ordered_extent_lock);
2786
2787 list_splice_init(&root->fs_info->ordered_operations, &splice);
2788 while (!list_empty(&splice)) {
2789 btrfs_inode = list_entry(splice.next, struct btrfs_inode,
2790 ordered_operations);
2791
2792 list_del_init(&btrfs_inode->ordered_operations);
2793
2794 btrfs_invalidate_inodes(btrfs_inode->root);
2795 }
2796
2797 spin_unlock(&root->fs_info->ordered_extent_lock);
2798 mutex_unlock(&root->fs_info->ordered_operations_mutex);
2799
2800 return 0;
2801}
2802
2803static int btrfs_destroy_ordered_extents(struct btrfs_root *root)
2804{
2805 struct list_head splice;
2806 struct btrfs_ordered_extent *ordered;
2807 struct inode *inode;
2808
2809 INIT_LIST_HEAD(&splice);
2810
2811 spin_lock(&root->fs_info->ordered_extent_lock);
2812
2813 list_splice_init(&root->fs_info->ordered_extents, &splice);
2814 while (!list_empty(&splice)) {
2815 ordered = list_entry(splice.next, struct btrfs_ordered_extent,
2816 root_extent_list);
2817
2818 list_del_init(&ordered->root_extent_list);
2819 atomic_inc(&ordered->refs);
2820
2821 /* the inode may be getting freed (in sys_unlink path). */
2822 inode = igrab(ordered->inode);
2823
2824 spin_unlock(&root->fs_info->ordered_extent_lock);
2825 if (inode)
2826 iput(inode);
2827
2828 atomic_set(&ordered->refs, 1);
2829 btrfs_put_ordered_extent(ordered);
2830
2831 spin_lock(&root->fs_info->ordered_extent_lock);
2832 }
2833
2834 spin_unlock(&root->fs_info->ordered_extent_lock);
2835
2836 return 0;
2837}
2838
2839static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
2840 struct btrfs_root *root)
2841{
2842 struct rb_node *node;
2843 struct btrfs_delayed_ref_root *delayed_refs;
2844 struct btrfs_delayed_ref_node *ref;
2845 int ret = 0;
2846
2847 delayed_refs = &trans->delayed_refs;
2848
2849 spin_lock(&delayed_refs->lock);
2850 if (delayed_refs->num_entries == 0) {
cfece4db 2851 spin_unlock(&delayed_refs->lock);
acce952b 2852 printk(KERN_INFO "delayed_refs has NO entry\n");
2853 return ret;
2854 }
2855
2856 node = rb_first(&delayed_refs->root);
2857 while (node) {
2858 ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node);
2859 node = rb_next(node);
2860
2861 ref->in_tree = 0;
2862 rb_erase(&ref->rb_node, &delayed_refs->root);
2863 delayed_refs->num_entries--;
2864
2865 atomic_set(&ref->refs, 1);
2866 if (btrfs_delayed_ref_is_head(ref)) {
2867 struct btrfs_delayed_ref_head *head;
2868
2869 head = btrfs_delayed_node_to_head(ref);
2870 mutex_lock(&head->mutex);
2871 kfree(head->extent_op);
2872 delayed_refs->num_heads--;
2873 if (list_empty(&head->cluster))
2874 delayed_refs->num_heads_ready--;
2875 list_del_init(&head->cluster);
2876 mutex_unlock(&head->mutex);
2877 }
2878
2879 spin_unlock(&delayed_refs->lock);
2880 btrfs_put_delayed_ref(ref);
2881
2882 cond_resched();
2883 spin_lock(&delayed_refs->lock);
2884 }
2885
2886 spin_unlock(&delayed_refs->lock);
2887
2888 return ret;
2889}
2890
2891static int btrfs_destroy_pending_snapshots(struct btrfs_transaction *t)
2892{
2893 struct btrfs_pending_snapshot *snapshot;
2894 struct list_head splice;
2895
2896 INIT_LIST_HEAD(&splice);
2897
2898 list_splice_init(&t->pending_snapshots, &splice);
2899
2900 while (!list_empty(&splice)) {
2901 snapshot = list_entry(splice.next,
2902 struct btrfs_pending_snapshot,
2903 list);
2904
2905 list_del_init(&snapshot->list);
2906
2907 kfree(snapshot);
2908 }
2909
2910 return 0;
2911}
2912
2913static int btrfs_destroy_delalloc_inodes(struct btrfs_root *root)
2914{
2915 struct btrfs_inode *btrfs_inode;
2916 struct list_head splice;
2917
2918 INIT_LIST_HEAD(&splice);
2919
acce952b 2920 spin_lock(&root->fs_info->delalloc_lock);
5be76758 2921 list_splice_init(&root->fs_info->delalloc_inodes, &splice);
acce952b 2922
2923 while (!list_empty(&splice)) {
2924 btrfs_inode = list_entry(splice.next, struct btrfs_inode,
2925 delalloc_inodes);
2926
2927 list_del_init(&btrfs_inode->delalloc_inodes);
2928
2929 btrfs_invalidate_inodes(btrfs_inode->root);
2930 }
2931
2932 spin_unlock(&root->fs_info->delalloc_lock);
2933
2934 return 0;
2935}
2936
2937static int btrfs_destroy_marked_extents(struct btrfs_root *root,
2938 struct extent_io_tree *dirty_pages,
2939 int mark)
2940{
2941 int ret;
2942 struct page *page;
2943 struct inode *btree_inode = root->fs_info->btree_inode;
2944 struct extent_buffer *eb;
2945 u64 start = 0;
2946 u64 end;
2947 u64 offset;
2948 unsigned long index;
2949
2950 while (1) {
2951 ret = find_first_extent_bit(dirty_pages, start, &start, &end,
2952 mark);
2953 if (ret)
2954 break;
2955
2956 clear_extent_bits(dirty_pages, start, end, mark, GFP_NOFS);
2957 while (start <= end) {
2958 index = start >> PAGE_CACHE_SHIFT;
2959 start = (u64)(index + 1) << PAGE_CACHE_SHIFT;
2960 page = find_get_page(btree_inode->i_mapping, index);
2961 if (!page)
2962 continue;
2963 offset = page_offset(page);
2964
2965 spin_lock(&dirty_pages->buffer_lock);
2966 eb = radix_tree_lookup(
2967 &(&BTRFS_I(page->mapping->host)->io_tree)->buffer,
2968 offset >> PAGE_CACHE_SHIFT);
2969 spin_unlock(&dirty_pages->buffer_lock);
2970 if (eb) {
2971 ret = test_and_clear_bit(EXTENT_BUFFER_DIRTY,
2972 &eb->bflags);
2973 atomic_set(&eb->refs, 1);
2974 }
2975 if (PageWriteback(page))
2976 end_page_writeback(page);
2977
2978 lock_page(page);
2979 if (PageDirty(page)) {
2980 clear_page_dirty_for_io(page);
2981 spin_lock_irq(&page->mapping->tree_lock);
2982 radix_tree_tag_clear(&page->mapping->page_tree,
2983 page_index(page),
2984 PAGECACHE_TAG_DIRTY);
2985 spin_unlock_irq(&page->mapping->tree_lock);
2986 }
2987
2988 page->mapping->a_ops->invalidatepage(page, 0);
2989 unlock_page(page);
2990 }
2991 }
2992
2993 return ret;
2994}
2995
2996static int btrfs_destroy_pinned_extent(struct btrfs_root *root,
2997 struct extent_io_tree *pinned_extents)
2998{
2999 struct extent_io_tree *unpin;
3000 u64 start;
3001 u64 end;
3002 int ret;
3003
3004 unpin = pinned_extents;
3005 while (1) {
3006 ret = find_first_extent_bit(unpin, 0, &start, &end,
3007 EXTENT_DIRTY);
3008 if (ret)
3009 break;
3010
3011 /* opt_discard */
5378e607
LD		 3012 if (btrfs_test_opt(root, DISCARD))
3013 ret = btrfs_error_discard_extent(root, start,
3014 end + 1 - start,
3015 NULL);
acce952b 3016
3017 clear_extent_dirty(unpin, start, end, GFP_NOFS);
3018 btrfs_error_unpin_extent_range(root, start, end);
3019 cond_resched();
3020 }
3021
3022 return 0;
3023}
3024
3025static int btrfs_cleanup_transaction(struct btrfs_root *root)
3026{
3027 struct btrfs_transaction *t;
3028 LIST_HEAD(list);
3029
3030 WARN_ON(1);
3031
acce952b 3032 mutex_lock(&root->fs_info->transaction_kthread_mutex);
3033
a4abeea4 3034 spin_lock(&root->fs_info->trans_lock);
acce952b 3035 list_splice_init(&root->fs_info->trans_list, &list);
a4abeea4
JB		 3036 root->fs_info->trans_no_join = 1;
3037 spin_unlock(&root->fs_info->trans_lock);
3038
acce952b 3039 while (!list_empty(&list)) {
3040 t = list_entry(list.next, struct btrfs_transaction, list);
3041 if (!t)
3042 break;
3043
3044 btrfs_destroy_ordered_operations(root);
3045
3046 btrfs_destroy_ordered_extents(root);
3047
3048 btrfs_destroy_delayed_refs(t, root);
3049
3050 btrfs_block_rsv_release(root,
3051 &root->fs_info->trans_block_rsv,
3052 t->dirty_pages.dirty_bytes);
3053
3054 /* FIXME: cleanup wait for commit */
3055 t->in_commit = 1;
3056 t->blocked = 1;
3057 if (waitqueue_active(&root->fs_info->transaction_blocked_wait))
3058 wake_up(&root->fs_info->transaction_blocked_wait);
3059
3060 t->blocked = 0;
3061 if (waitqueue_active(&root->fs_info->transaction_wait))
3062 wake_up(&root->fs_info->transaction_wait);
acce952b 3063
acce952b 3064 t->commit_done = 1;
3065 if (waitqueue_active(&t->commit_wait))
3066 wake_up(&t->commit_wait);
acce952b 3067
3068 btrfs_destroy_pending_snapshots(t);
3069
3070 btrfs_destroy_delalloc_inodes(root);
3071
a4abeea4 3072 spin_lock(&root->fs_info->trans_lock);
acce952b 3073 root->fs_info->running_transaction = NULL;
a4abeea4 3074 spin_unlock(&root->fs_info->trans_lock);
acce952b 3075
3076 btrfs_destroy_marked_extents(root, &t->dirty_pages,
3077 EXTENT_DIRTY);
3078
3079 btrfs_destroy_pinned_extent(root,
3080 root->fs_info->pinned_extents);
3081
13c5a93e 3082 atomic_set(&t->use_count, 0);
acce952b 3083 list_del_init(&t->list);
3084 memset(t, 0, sizeof(*t));
3085 kmem_cache_free(btrfs_transaction_cachep, t);
3086 }
3087
a4abeea4
JB		 3088 spin_lock(&root->fs_info->trans_lock);
3089 root->fs_info->trans_no_join = 0;
3090 spin_unlock(&root->fs_info->trans_lock);
acce952b 3091 mutex_unlock(&root->fs_info->transaction_kthread_mutex);
acce952b 3092
3093 return 0;
3094}
3095
d1310b2e 3096static struct extent_io_ops btree_extent_io_ops = {
4bef0848 3097 .write_cache_pages_lock_hook = btree_lock_page_hook,
ce9adaa5 3098 .readpage_end_io_hook = btree_readpage_end_io_hook,
0b86a832 3099 .submit_bio_hook = btree_submit_bio_hook,
239b14b3
CM		 3100 /* note we're sharing with inode.c for the merge bio hook */
3101 .merge_bio_hook = btrfs_merge_bio_hook,
0da5468f 3102};
Linux 6.x block layer and io_uring tree(s)