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Btrfs: Make async snapshot ioctl more generic
[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>
4b4e25f2 32#include "compat.h"
eb60ceac
CM		 33#include "ctree.h"
34#include "disk-io.h"
e089f05c 35#include "transaction.h"
0f7d52f4 36#include "btrfs_inode.h"
0b86a832 37#include "volumes.h"
db94535d 38#include "print-tree.h"
8b712842 39#include "async-thread.h"
925baedd 40#include "locking.h"
e02119d5 41#include "tree-log.h"
fa9c0d79 42#include "free-space-cache.h"
eb60ceac 43
d1310b2e 44static struct extent_io_ops btree_extent_io_ops;
8b712842 45static void end_workqueue_fn(struct btrfs_work *work);
4df27c4d 46static void free_fs_root(struct btrfs_root *root);
ce9adaa5 47
d352ac68
CM		 48/*
49 * end_io_wq structs are used to do processing in task context when an IO is
50 * complete. This is used during reads to verify checksums, and it is used
51 * by writes to insert metadata for new file extents after IO is complete.
52 */
ce9adaa5
CM		 53struct end_io_wq {
54 struct bio *bio;
55 bio_end_io_t *end_io;
56 void *private;
57 struct btrfs_fs_info *info;
58 int error;
22c59948 59 int metadata;
ce9adaa5 60 struct list_head list;
8b712842 61 struct btrfs_work work;
ce9adaa5 62};
0da5468f 63
d352ac68
CM		 64/*
65 * async submit bios are used to offload expensive checksumming
66 * onto the worker threads. They checksum file and metadata bios
67 * just before they are sent down the IO stack.
68 */
44b8bd7e
CM		 69struct async_submit_bio {
70 struct inode *inode;
71 struct bio *bio;
72 struct list_head list;
4a69a410
CM		 73 extent_submit_bio_hook_t *submit_bio_start;
74 extent_submit_bio_hook_t *submit_bio_done;
44b8bd7e
CM		 75 int rw;
76 int mirror_num;
c8b97818 77 unsigned long bio_flags;
eaf25d93
CM		 78 /*
79 * bio_offset is optional, can be used if the pages in the bio
80 * can't tell us where in the file the bio should go
81 */
82 u64 bio_offset;
8b712842 83 struct btrfs_work work;
44b8bd7e
CM		 84};
85
4008c04a
CM		 86/* These are used to set the lockdep class on the extent buffer locks.
87 * The class is set by the readpage_end_io_hook after the buffer has
88 * passed csum validation but before the pages are unlocked.
89 *
90 * The lockdep class is also set by btrfs_init_new_buffer on freshly
91 * allocated blocks.
92 *
93 * The class is based on the level in the tree block, which allows lockdep
94 * to know that lower nodes nest inside the locks of higher nodes.
95 *
96 * We also add a check to make sure the highest level of the tree is
97 * the same as our lockdep setup here. If BTRFS_MAX_LEVEL changes, this
98 * code needs update as well.
99 */
100#ifdef CONFIG_DEBUG_LOCK_ALLOC
101# if BTRFS_MAX_LEVEL != 8
102# error
103# endif
104static struct lock_class_key btrfs_eb_class[BTRFS_MAX_LEVEL + 1];
105static const char *btrfs_eb_name[BTRFS_MAX_LEVEL + 1] = {
106 /* leaf */
107 "btrfs-extent-00",
108 "btrfs-extent-01",
109 "btrfs-extent-02",
110 "btrfs-extent-03",
111 "btrfs-extent-04",
112 "btrfs-extent-05",
113 "btrfs-extent-06",
114 "btrfs-extent-07",
115 /* highest possible level */
116 "btrfs-extent-08",
117};
118#endif
119
d352ac68
CM		 120/*
121 * extents on the btree inode are pretty simple, there's one extent
122 * that covers the entire device
123 */
b2950863
CH		 124static struct extent_map *btree_get_extent(struct inode *inode,
125 struct page *page, size_t page_offset, u64 start, u64 len,
126 int create)
7eccb903 127{
5f39d397
CM		 128 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
129 struct extent_map *em;
130 int ret;
131
890871be 132 read_lock(&em_tree->lock);
d1310b2e 133 em = lookup_extent_mapping(em_tree, start, len);
a061fc8d
CM		 134 if (em) {
135 em->bdev =
136 BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev;
890871be 137 read_unlock(&em_tree->lock);
5f39d397 138 goto out;
a061fc8d 139 }
890871be 140 read_unlock(&em_tree->lock);
7b13b7b1 141
5f39d397
CM		 142 em = alloc_extent_map(GFP_NOFS);
143 if (!em) {
144 em = ERR_PTR(-ENOMEM);
145 goto out;
146 }
147 em->start = 0;
0afbaf8c 148 em->len = (u64)-1;
c8b97818 149 em->block_len = (u64)-1;
5f39d397 150 em->block_start = 0;
a061fc8d 151 em->bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev;
d1310b2e 152
890871be 153 write_lock(&em_tree->lock);
5f39d397
CM		 154 ret = add_extent_mapping(em_tree, em);
155 if (ret == -EEXIST) {
0afbaf8c
CM		 156 u64 failed_start = em->start;
157 u64 failed_len = em->len;
158
5f39d397 159 free_extent_map(em);
7b13b7b1 160 em = lookup_extent_mapping(em_tree, start, len);
0afbaf8c 161 if (em) {
7b13b7b1 162 ret = 0;
0afbaf8c
CM		 163 } else {
164 em = lookup_extent_mapping(em_tree, failed_start,
165 failed_len);
7b13b7b1 166 ret = -EIO;
0afbaf8c 167 }
5f39d397 168 } else if (ret) {
7b13b7b1
CM		 169 free_extent_map(em);
170 em = NULL;
5f39d397 171 }
890871be 172 write_unlock(&em_tree->lock);
7b13b7b1
CM		 173
174 if (ret)
175 em = ERR_PTR(ret);
5f39d397
CM		 176out:
177 return em;
7eccb903
CM		 178}
179
19c00ddc
CM		 180u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len)
181{
163e783e 182 return crc32c(seed, data, len);
19c00ddc
CM		 183}
184
185void btrfs_csum_final(u32 crc, char *result)
186{
187 *(__le32 *)result = ~cpu_to_le32(crc);
188}
189
d352ac68
CM		 190/*
191 * compute the csum for a btree block, and either verify it or write it
192 * into the csum field of the block.
193 */
19c00ddc
CM		 194static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
195 int verify)
196{
607d432d
JB		 197 u16 csum_size =
198 btrfs_super_csum_size(&root->fs_info->super_copy);
199 char *result = NULL;
19c00ddc
CM		 200 unsigned long len;
201 unsigned long cur_len;
202 unsigned long offset = BTRFS_CSUM_SIZE;
203 char *map_token = NULL;
204 char *kaddr;
205 unsigned long map_start;
206 unsigned long map_len;
207 int err;
208 u32 crc = ~(u32)0;
607d432d 209 unsigned long inline_result;
19c00ddc
CM		 210
211 len = buf->len - offset;
d397712b 212 while (len > 0) {
19c00ddc
CM		 213 err = map_private_extent_buffer(buf, offset, 32,
214 &map_token, &kaddr,
215 &map_start, &map_len, KM_USER0);
d397712b 216 if (err)
19c00ddc 217 return 1;
19c00ddc
CM		 218 cur_len = min(len, map_len - (offset - map_start));
219 crc = btrfs_csum_data(root, kaddr + offset - map_start,
220 crc, cur_len);
221 len -= cur_len;
222 offset += cur_len;
223 unmap_extent_buffer(buf, map_token, KM_USER0);
224 }
607d432d
JB		 225 if (csum_size > sizeof(inline_result)) {
226 result = kzalloc(csum_size * sizeof(char), GFP_NOFS);
227 if (!result)
228 return 1;
229 } else {
230 result = (char *)&inline_result;
231 }
232
19c00ddc
CM		 233 btrfs_csum_final(crc, result);
234
235 if (verify) {
607d432d 236 if (memcmp_extent_buffer(buf, result, 0, csum_size)) {
e4204ded
CM		 237 u32 val;
238 u32 found = 0;
607d432d 239 memcpy(&found, result, csum_size);
e4204ded 240
607d432d 241 read_extent_buffer(buf, &val, 0, csum_size);
193f284d
CM		 242 if (printk_ratelimit()) {
243 printk(KERN_INFO "btrfs: %s checksum verify "
244 "failed on %llu wanted %X found %X "
245 "level %d\n",
246 root->fs_info->sb->s_id,
247 (unsigned long long)buf->start, val, found,
248 btrfs_header_level(buf));
249 }
607d432d
JB		 250 if (result != (char *)&inline_result)
251 kfree(result);
19c00ddc
CM		 252 return 1;
253 }
254 } else {
607d432d 255 write_extent_buffer(buf, result, 0, csum_size);
19c00ddc 256 }
607d432d
JB		 257 if (result != (char *)&inline_result)
258 kfree(result);
19c00ddc
CM		 259 return 0;
260}
261
d352ac68
CM		 262/*
263 * we can't consider a given block up to date unless the transid of the
264 * block matches the transid in the parent node's pointer. This is how we
265 * detect blocks that either didn't get written at all or got written
266 * in the wrong place.
267 */
1259ab75
CM		 268static int verify_parent_transid(struct extent_io_tree *io_tree,
269 struct extent_buffer *eb, u64 parent_transid)
270{
2ac55d41 271 struct extent_state *cached_state = NULL;
1259ab75
CM		 272 int ret;
273
274 if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
275 return 0;
276
2ac55d41
JB		 277 lock_extent_bits(io_tree, eb->start, eb->start + eb->len - 1,
278 0, &cached_state, GFP_NOFS);
279 if (extent_buffer_uptodate(io_tree, eb, cached_state) &&
1259ab75
CM		 280 btrfs_header_generation(eb) == parent_transid) {
281 ret = 0;
282 goto out;
283 }
193f284d
CM		 284 if (printk_ratelimit()) {
285 printk("parent transid verify failed on %llu wanted %llu "
286 "found %llu\n",
287 (unsigned long long)eb->start,
288 (unsigned long long)parent_transid,
289 (unsigned long long)btrfs_header_generation(eb));
290 }
1259ab75 291 ret = 1;
2ac55d41 292 clear_extent_buffer_uptodate(io_tree, eb, &cached_state);
33958dc6 293out:
2ac55d41
JB		 294 unlock_extent_cached(io_tree, eb->start, eb->start + eb->len - 1,
295 &cached_state, GFP_NOFS);
1259ab75 296 return ret;
1259ab75
CM		 297}
298
d352ac68
CM		 299/*
300 * helper to read a given tree block, doing retries as required when
301 * the checksums don't match and we have alternate mirrors to try.
302 */
f188591e
CM		 303static int btree_read_extent_buffer_pages(struct btrfs_root *root,
304 struct extent_buffer *eb,
ca7a79ad 305 u64 start, u64 parent_transid)
f188591e
CM		 306{
307 struct extent_io_tree *io_tree;
308 int ret;
309 int num_copies = 0;
310 int mirror_num = 0;
311
312 io_tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree;
313 while (1) {
314 ret = read_extent_buffer_pages(io_tree, eb, start, 1,
315 btree_get_extent, mirror_num);
1259ab75
CM		 316 if (!ret &&
317 !verify_parent_transid(io_tree, eb, parent_transid))
f188591e 318 return ret;
d397712b 319
f188591e
CM		 320 num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
321 eb->start, eb->len);
4235298e 322 if (num_copies == 1)
f188591e 323 return ret;
4235298e 324
f188591e 325 mirror_num++;
4235298e 326 if (mirror_num > num_copies)
f188591e 327 return ret;
f188591e 328 }
f188591e
CM		 329 return -EIO;
330}
19c00ddc 331
d352ac68 332/*
d397712b
CM		 333 * checksum a dirty tree block before IO. This has extra checks to make sure
334 * we only fill in the checksum field in the first page of a multi-page block
d352ac68 335 */
d397712b 336
b2950863 337static int csum_dirty_buffer(struct btrfs_root *root, struct page *page)
19c00ddc 338{
d1310b2e 339 struct extent_io_tree *tree;
35ebb934 340 u64 start = (u64)page->index << PAGE_CACHE_SHIFT;
19c00ddc 341 u64 found_start;
19c00ddc
CM		 342 unsigned long len;
343 struct extent_buffer *eb;
f188591e
CM		 344 int ret;
345
d1310b2e 346 tree = &BTRFS_I(page->mapping->host)->io_tree;
19c00ddc
CM		 347
348 if (page->private == EXTENT_PAGE_PRIVATE)
349 goto out;
350 if (!page->private)
351 goto out;
352 len = page->private >> 2;
d397712b
CM		 353 WARN_ON(len == 0);
354
19c00ddc 355 eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS);
ca7a79ad
CM		 356 ret = btree_read_extent_buffer_pages(root, eb, start + PAGE_CACHE_SIZE,
357 btrfs_header_generation(eb));
f188591e 358 BUG_ON(ret);
784b4e29
CM		 359 WARN_ON(!btrfs_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN));
360
19c00ddc
CM		 361 found_start = btrfs_header_bytenr(eb);
362 if (found_start != start) {
55c69072
CM		 363 WARN_ON(1);
364 goto err;
365 }
366 if (eb->first_page != page) {
55c69072
CM		 367 WARN_ON(1);
368 goto err;
369 }
370 if (!PageUptodate(page)) {
55c69072
CM		 371 WARN_ON(1);
372 goto err;
19c00ddc 373 }
19c00ddc 374 csum_tree_block(root, eb, 0);
55c69072 375err:
19c00ddc
CM		 376 free_extent_buffer(eb);
377out:
378 return 0;
379}
380
2b82032c
YZ		 381static int check_tree_block_fsid(struct btrfs_root *root,
382 struct extent_buffer *eb)
383{
384 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
385 u8 fsid[BTRFS_UUID_SIZE];
386 int ret = 1;
387
388 read_extent_buffer(eb, fsid, (unsigned long)btrfs_header_fsid(eb),
389 BTRFS_FSID_SIZE);
390 while (fs_devices) {
391 if (!memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE)) {
392 ret = 0;
393 break;
394 }
395 fs_devices = fs_devices->seed;
396 }
397 return ret;
398}
399
4008c04a
CM		 400#ifdef CONFIG_DEBUG_LOCK_ALLOC
401void btrfs_set_buffer_lockdep_class(struct extent_buffer *eb, int level)
402{
403 lockdep_set_class_and_name(&eb->lock,
404 &btrfs_eb_class[level],
405 btrfs_eb_name[level]);
406}
407#endif
408
b2950863 409static int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end,
ce9adaa5
CM		 410 struct extent_state *state)
411{
412 struct extent_io_tree *tree;
413 u64 found_start;
414 int found_level;
415 unsigned long len;
416 struct extent_buffer *eb;
417 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
f188591e 418 int ret = 0;
ce9adaa5
CM		 419
420 tree = &BTRFS_I(page->mapping->host)->io_tree;
421 if (page->private == EXTENT_PAGE_PRIVATE)
422 goto out;
423 if (!page->private)
424 goto out;
d397712b 425
ce9adaa5 426 len = page->private >> 2;
d397712b
CM		 427 WARN_ON(len == 0);
428
ce9adaa5 429 eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS);
f188591e 430
ce9adaa5 431 found_start = btrfs_header_bytenr(eb);
23a07867 432 if (found_start != start) {
193f284d
CM		 433 if (printk_ratelimit()) {
434 printk(KERN_INFO "btrfs bad tree block start "
435 "%llu %llu\n",
436 (unsigned long long)found_start,
437 (unsigned long long)eb->start);
438 }
f188591e 439 ret = -EIO;
ce9adaa5
CM		 440 goto err;
441 }
442 if (eb->first_page != page) {
d397712b
CM		 443 printk(KERN_INFO "btrfs bad first page %lu %lu\n",
444 eb->first_page->index, page->index);
ce9adaa5 445 WARN_ON(1);
f188591e 446 ret = -EIO;
ce9adaa5
CM		 447 goto err;
448 }
2b82032c 449 if (check_tree_block_fsid(root, eb)) {
193f284d
CM		 450 if (printk_ratelimit()) {
451 printk(KERN_INFO "btrfs bad fsid on block %llu\n",
452 (unsigned long long)eb->start);
453 }
1259ab75
CM		 454 ret = -EIO;
455 goto err;
456 }
ce9adaa5
CM		 457 found_level = btrfs_header_level(eb);
458
4008c04a
CM		 459 btrfs_set_buffer_lockdep_class(eb, found_level);
460
ce9adaa5 461 ret = csum_tree_block(root, eb, 1);
f188591e
CM		 462 if (ret)
463 ret = -EIO;
ce9adaa5
CM		 464
465 end = min_t(u64, eb->len, PAGE_CACHE_SIZE);
466 end = eb->start + end - 1;
ce9adaa5
CM		 467err:
468 free_extent_buffer(eb);
469out:
f188591e 470 return ret;
ce9adaa5
CM		 471}
472
ce9adaa5 473static void end_workqueue_bio(struct bio *bio, int err)
ce9adaa5
CM		 474{
475 struct end_io_wq *end_io_wq = bio->bi_private;
476 struct btrfs_fs_info *fs_info;
ce9adaa5 477
ce9adaa5 478 fs_info = end_io_wq->info;
ce9adaa5 479 end_io_wq->error = err;
8b712842
CM		 480 end_io_wq->work.func = end_workqueue_fn;
481 end_io_wq->work.flags = 0;
d20f7043 482
7b6d91da 483 if (bio->bi_rw & REQ_WRITE) {
0cb59c99 484 if (end_io_wq->metadata == 1)
cad321ad
CM		 485 btrfs_queue_worker(&fs_info->endio_meta_write_workers,
486 &end_io_wq->work);
0cb59c99
JB		 487 else if (end_io_wq->metadata == 2)
488 btrfs_queue_worker(&fs_info->endio_freespace_worker,
489 &end_io_wq->work);
cad321ad
CM		 490 else
491 btrfs_queue_worker(&fs_info->endio_write_workers,
492 &end_io_wq->work);
d20f7043
CM		 493 } else {
494 if (end_io_wq->metadata)
495 btrfs_queue_worker(&fs_info->endio_meta_workers,
496 &end_io_wq->work);
497 else
498 btrfs_queue_worker(&fs_info->endio_workers,
499 &end_io_wq->work);
500 }
ce9adaa5
CM		 501}
502
0cb59c99
JB		 503/*
504 * For the metadata arg you want
505 *
506 * 0 - if data
507 * 1 - if normal metadta
508 * 2 - if writing to the free space cache area
509 */
22c59948
CM		 510int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
511 int metadata)
0b86a832 512{
ce9adaa5 513 struct end_io_wq *end_io_wq;
ce9adaa5
CM		 514 end_io_wq = kmalloc(sizeof(*end_io_wq), GFP_NOFS);
515 if (!end_io_wq)
516 return -ENOMEM;
517
518 end_io_wq->private = bio->bi_private;
519 end_io_wq->end_io = bio->bi_end_io;
22c59948 520 end_io_wq->info = info;
ce9adaa5
CM		 521 end_io_wq->error = 0;
522 end_io_wq->bio = bio;
22c59948 523 end_io_wq->metadata = metadata;
ce9adaa5
CM		 524
525 bio->bi_private = end_io_wq;
526 bio->bi_end_io = end_workqueue_bio;
22c59948
CM		 527 return 0;
528}
529
b64a2851 530unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info)
0986fe9e 531{
4854ddd0
CM		 532 unsigned long limit = min_t(unsigned long,
533 info->workers.max_workers,
534 info->fs_devices->open_devices);
535 return 256 * limit;
536}
0986fe9e 537
4854ddd0
CM		 538int btrfs_congested_async(struct btrfs_fs_info *info, int iodone)
539{
b64a2851
CM		 540 return atomic_read(&info->nr_async_bios) >
541 btrfs_async_submit_limit(info);
0986fe9e
CM		 542}
543
4a69a410
CM		 544static void run_one_async_start(struct btrfs_work *work)
545{
4a69a410
CM		 546 struct async_submit_bio *async;
547
548 async = container_of(work, struct async_submit_bio, work);
4a69a410 549 async->submit_bio_start(async->inode, async->rw, async->bio,
eaf25d93
CM		 550 async->mirror_num, async->bio_flags,
551 async->bio_offset);
4a69a410
CM		 552}
553
554static void run_one_async_done(struct btrfs_work *work)
8b712842
CM		 555{
556 struct btrfs_fs_info *fs_info;
557 struct async_submit_bio *async;
4854ddd0 558 int limit;
8b712842
CM		 559
560 async = container_of(work, struct async_submit_bio, work);
561 fs_info = BTRFS_I(async->inode)->root->fs_info;
4854ddd0 562
b64a2851 563 limit = btrfs_async_submit_limit(fs_info);
4854ddd0
CM		 564 limit = limit * 2 / 3;
565
8b712842 566 atomic_dec(&fs_info->nr_async_submits);
0986fe9e 567
b64a2851
CM		 568 if (atomic_read(&fs_info->nr_async_submits) < limit &&
569 waitqueue_active(&fs_info->async_submit_wait))
4854ddd0
CM		 570 wake_up(&fs_info->async_submit_wait);
571
4a69a410 572 async->submit_bio_done(async->inode, async->rw, async->bio,
eaf25d93
CM		 573 async->mirror_num, async->bio_flags,
574 async->bio_offset);
4a69a410
CM		 575}
576
577static void run_one_async_free(struct btrfs_work *work)
578{
579 struct async_submit_bio *async;
580
581 async = container_of(work, struct async_submit_bio, work);
8b712842
CM		 582 kfree(async);
583}
584
44b8bd7e
CM		 585int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
586 int rw, struct bio *bio, int mirror_num,
c8b97818 587 unsigned long bio_flags,
eaf25d93 588 u64 bio_offset,
4a69a410
CM		 589 extent_submit_bio_hook_t *submit_bio_start,
590 extent_submit_bio_hook_t *submit_bio_done)
44b8bd7e
CM		 591{
592 struct async_submit_bio *async;
593
594 async = kmalloc(sizeof(*async), GFP_NOFS);
595 if (!async)
596 return -ENOMEM;
597
598 async->inode = inode;
599 async->rw = rw;
600 async->bio = bio;
601 async->mirror_num = mirror_num;
4a69a410
CM		 602 async->submit_bio_start = submit_bio_start;
603 async->submit_bio_done = submit_bio_done;
604
605 async->work.func = run_one_async_start;
606 async->work.ordered_func = run_one_async_done;
607 async->work.ordered_free = run_one_async_free;
608
8b712842 609 async->work.flags = 0;
c8b97818 610 async->bio_flags = bio_flags;
eaf25d93 611 async->bio_offset = bio_offset;
8c8bee1d 612
cb03c743 613 atomic_inc(&fs_info->nr_async_submits);
d313d7a3 614
7b6d91da 615 if (rw & REQ_SYNC)
d313d7a3
CM		 616 btrfs_set_work_high_prio(&async->work);
617
8b712842 618 btrfs_queue_worker(&fs_info->workers, &async->work);
9473f16c 619
d397712b 620 while (atomic_read(&fs_info->async_submit_draining) &&
771ed689
CM		 621 atomic_read(&fs_info->nr_async_submits)) {
622 wait_event(fs_info->async_submit_wait,
623 (atomic_read(&fs_info->nr_async_submits) == 0));
624 }
625
44b8bd7e
CM		 626 return 0;
627}
628
ce3ed71a
CM		 629static int btree_csum_one_bio(struct bio *bio)
630{
631 struct bio_vec *bvec = bio->bi_io_vec;
632 int bio_index = 0;
633 struct btrfs_root *root;
634
635 WARN_ON(bio->bi_vcnt <= 0);
d397712b 636 while (bio_index < bio->bi_vcnt) {
ce3ed71a
CM		 637 root = BTRFS_I(bvec->bv_page->mapping->host)->root;
638 csum_dirty_buffer(root, bvec->bv_page);
639 bio_index++;
640 bvec++;
641 }
642 return 0;
643}
644
4a69a410
CM		 645static int __btree_submit_bio_start(struct inode *inode, int rw,
646 struct bio *bio, int mirror_num,
eaf25d93
CM		 647 unsigned long bio_flags,
648 u64 bio_offset)
22c59948 649{
8b712842
CM		 650 /*
651 * when we're called for a write, we're already in the async
5443be45 652 * submission context. Just jump into btrfs_map_bio
8b712842 653 */
4a69a410
CM		 654 btree_csum_one_bio(bio);
655 return 0;
656}
22c59948 657
4a69a410 658static int __btree_submit_bio_done(struct inode *inode, int rw, struct bio *bio,
eaf25d93
CM		 659 int mirror_num, unsigned long bio_flags,
660 u64 bio_offset)
4a69a410 661{
8b712842 662 /*
4a69a410
CM		 663 * when we're called for a write, we're already in the async
664 * submission context. Just jump into btrfs_map_bio
8b712842 665 */
8b712842 666 return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num, 1);
0b86a832
CM		 667}
668
44b8bd7e 669static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
eaf25d93
CM		 670 int mirror_num, unsigned long bio_flags,
671 u64 bio_offset)
44b8bd7e 672{
cad321ad
CM		 673 int ret;
674
675 ret = btrfs_bio_wq_end_io(BTRFS_I(inode)->root->fs_info,
676 bio, 1);
677 BUG_ON(ret);
678
7b6d91da 679 if (!(rw & REQ_WRITE)) {
4a69a410
CM		 680 /*
681 * called for a read, do the setup so that checksum validation
682 * can happen in the async kernel threads
683 */
4a69a410 684 return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio,
6f3577bd 685 mirror_num, 0);
44b8bd7e 686 }
d313d7a3 687
cad321ad
CM		 688 /*
689 * kthread helpers are used to submit writes so that checksumming
690 * can happen in parallel across all CPUs
691 */
44b8bd7e 692 return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info,
c8b97818 693 inode, rw, bio, mirror_num, 0,
eaf25d93 694 bio_offset,
4a69a410
CM		 695 __btree_submit_bio_start,
696 __btree_submit_bio_done);
44b8bd7e
CM		 697}
698
784b4e29
CM		 699static int btree_migratepage(struct address_space *mapping,
700 struct page *newpage, struct page *page)
701{
702 /*
703 * we can't safely write a btree page from here,
704 * we haven't done the locking hook
705 */
706 if (PageDirty(page))
707 return -EAGAIN;
708 /*
709 * Buffers may be managed in a filesystem specific way.
710 * We must have no buffers or drop them.
711 */
712 if (page_has_private(page) &&
713 !try_to_release_page(page, GFP_KERNEL))
714 return -EAGAIN;
5a92bc88 715#ifdef CONFIG_MIGRATION
784b4e29 716 return migrate_page(mapping, newpage, page);
5a92bc88
CM		 717#else
718 return -ENOSYS;
719#endif
784b4e29
CM		 720}
721
0da5468f
CM		 722static int btree_writepage(struct page *page, struct writeback_control *wbc)
723{
d1310b2e 724 struct extent_io_tree *tree;
b9473439
CM		 725 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
726 struct extent_buffer *eb;
727 int was_dirty;
728
d1310b2e 729 tree = &BTRFS_I(page->mapping->host)->io_tree;
b9473439
CM		 730 if (!(current->flags & PF_MEMALLOC)) {
731 return extent_write_full_page(tree, page,
732 btree_get_extent, wbc);
733 }
5443be45 734
b9473439 735 redirty_page_for_writepage(wbc, page);
784b4e29 736 eb = btrfs_find_tree_block(root, page_offset(page), PAGE_CACHE_SIZE);
b9473439
CM		 737 WARN_ON(!eb);
738
739 was_dirty = test_and_set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags);
740 if (!was_dirty) {
741 spin_lock(&root->fs_info->delalloc_lock);
742 root->fs_info->dirty_metadata_bytes += PAGE_CACHE_SIZE;
743 spin_unlock(&root->fs_info->delalloc_lock);
5443be45 744 }
b9473439
CM		 745 free_extent_buffer(eb);
746
747 unlock_page(page);
748 return 0;
5f39d397 749}
0da5468f
CM		 750
751static int btree_writepages(struct address_space *mapping,
752 struct writeback_control *wbc)
753{
d1310b2e
CM		 754 struct extent_io_tree *tree;
755 tree = &BTRFS_I(mapping->host)->io_tree;
d8d5f3e1 756 if (wbc->sync_mode == WB_SYNC_NONE) {
b9473439 757 struct btrfs_root *root = BTRFS_I(mapping->host)->root;
793955bc 758 u64 num_dirty;
24ab9cd8 759 unsigned long thresh = 32 * 1024 * 1024;
448d640b
CM		 760
761 if (wbc->for_kupdate)
762 return 0;
763
b9473439
CM		 764 /* this is a bit racy, but that's ok */
765 num_dirty = root->fs_info->dirty_metadata_bytes;
d397712b 766 if (num_dirty < thresh)
793955bc 767 return 0;
793955bc 768 }
0da5468f
CM		 769 return extent_writepages(tree, mapping, btree_get_extent, wbc);
770}
771
b2950863 772static int btree_readpage(struct file *file, struct page *page)
5f39d397 773{
d1310b2e
CM		 774 struct extent_io_tree *tree;
775 tree = &BTRFS_I(page->mapping->host)->io_tree;
5f39d397
CM		 776 return extent_read_full_page(tree, page, btree_get_extent);
777}
22b0ebda 778
70dec807 779static int btree_releasepage(struct page *page, gfp_t gfp_flags)
5f39d397 780{
d1310b2e
CM		 781 struct extent_io_tree *tree;
782 struct extent_map_tree *map;
5f39d397 783 int ret;
d98237b3 784
98509cfc 785 if (PageWriteback(page) || PageDirty(page))
d397712b 786 return 0;
98509cfc 787
d1310b2e
CM		 788 tree = &BTRFS_I(page->mapping->host)->io_tree;
789 map = &BTRFS_I(page->mapping->host)->extent_tree;
6af118ce 790
7b13b7b1 791 ret = try_release_extent_state(map, tree, page, gfp_flags);
d397712b 792 if (!ret)
6af118ce 793 return 0;
6af118ce
CM		 794
795 ret = try_release_extent_buffer(tree, page);
5f39d397
CM		 796 if (ret == 1) {
797 ClearPagePrivate(page);
798 set_page_private(page, 0);
799 page_cache_release(page);
800 }
6af118ce 801
d98237b3
CM		 802 return ret;
803}
804
5f39d397 805static void btree_invalidatepage(struct page *page, unsigned long offset)
d98237b3 806{
d1310b2e
CM		 807 struct extent_io_tree *tree;
808 tree = &BTRFS_I(page->mapping->host)->io_tree;
5f39d397
CM		 809 extent_invalidatepage(tree, page, offset);
810 btree_releasepage(page, GFP_NOFS);
9ad6b7bc 811 if (PagePrivate(page)) {
d397712b
CM		 812 printk(KERN_WARNING "btrfs warning page private not zero "
813 "on page %llu\n", (unsigned long long)page_offset(page));
9ad6b7bc
CM		 814 ClearPagePrivate(page);
815 set_page_private(page, 0);
816 page_cache_release(page);
817 }
d98237b3
CM		 818}
819
7f09410b 820static const struct address_space_operations btree_aops = {
d98237b3
CM		 821 .readpage = btree_readpage,
822 .writepage = btree_writepage,
0da5468f 823 .writepages = btree_writepages,
5f39d397
CM		 824 .releasepage = btree_releasepage,
825 .invalidatepage = btree_invalidatepage,
d98237b3 826 .sync_page = block_sync_page,
5a92bc88 827#ifdef CONFIG_MIGRATION
784b4e29 828 .migratepage = btree_migratepage,
5a92bc88 829#endif
d98237b3
CM		 830};
831
ca7a79ad
CM		 832int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
833 u64 parent_transid)
090d1875 834{
5f39d397
CM		 835 struct extent_buffer *buf = NULL;
836 struct inode *btree_inode = root->fs_info->btree_inode;
de428b63 837 int ret = 0;
090d1875 838
db94535d 839 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
5f39d397 840 if (!buf)
090d1875 841 return 0;
d1310b2e 842 read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree,
f188591e 843 buf, 0, 0, btree_get_extent, 0);
5f39d397 844 free_extent_buffer(buf);
de428b63 845 return ret;
090d1875
CM		 846}
847
0999df54
CM		 848struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
849 u64 bytenr, u32 blocksize)
850{
851 struct inode *btree_inode = root->fs_info->btree_inode;
852 struct extent_buffer *eb;
853 eb = find_extent_buffer(&BTRFS_I(btree_inode)->io_tree,
854 bytenr, blocksize, GFP_NOFS);
855 return eb;
856}
857
858struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
859 u64 bytenr, u32 blocksize)
860{
861 struct inode *btree_inode = root->fs_info->btree_inode;
862 struct extent_buffer *eb;
863
864 eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->io_tree,
865 bytenr, blocksize, NULL, GFP_NOFS);
866 return eb;
867}
868
869
e02119d5
CM		 870int btrfs_write_tree_block(struct extent_buffer *buf)
871{
8aa38c31
CH		 872 return filemap_fdatawrite_range(buf->first_page->mapping, buf->start,
873 buf->start + buf->len - 1);
e02119d5
CM		 874}
875
876int btrfs_wait_tree_block_writeback(struct extent_buffer *buf)
877{
8aa38c31
CH		 878 return filemap_fdatawait_range(buf->first_page->mapping,
879 buf->start, buf->start + buf->len - 1);
e02119d5
CM		 880}
881
0999df54 882struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
ca7a79ad 883 u32 blocksize, u64 parent_transid)
0999df54
CM		 884{
885 struct extent_buffer *buf = NULL;
0999df54
CM		 886 int ret;
887
0999df54
CM		 888 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
889 if (!buf)
890 return NULL;
0999df54 891
ca7a79ad 892 ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid);
ce9adaa5 893
d397712b 894 if (ret == 0)
b4ce94de 895 set_bit(EXTENT_BUFFER_UPTODATE, &buf->bflags);
5f39d397 896 return buf;
ce9adaa5 897
eb60ceac
CM		 898}
899
e089f05c 900int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
5f39d397 901 struct extent_buffer *buf)
ed2ff2cb 902{
5f39d397 903 struct inode *btree_inode = root->fs_info->btree_inode;
55c69072 904 if (btrfs_header_generation(buf) ==
925baedd 905 root->fs_info->running_transaction->transid) {
b9447ef8 906 btrfs_assert_tree_locked(buf);
b4ce94de 907
b9473439
CM		 908 if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)) {
909 spin_lock(&root->fs_info->delalloc_lock);
910 if (root->fs_info->dirty_metadata_bytes >= buf->len)
911 root->fs_info->dirty_metadata_bytes -= buf->len;
912 else
913 WARN_ON(1);
914 spin_unlock(&root->fs_info->delalloc_lock);
915 }
b4ce94de 916
b9473439
CM		 917 /* ugh, clear_extent_buffer_dirty needs to lock the page */
918 btrfs_set_lock_blocking(buf);
d1310b2e 919 clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree,
55c69072 920 buf);
925baedd 921 }
5f39d397
CM		 922 return 0;
923}
924
db94535d 925static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
87ee04eb 926 u32 stripesize, struct btrfs_root *root,
9f5fae2f 927 struct btrfs_fs_info *fs_info,
e20d96d6 928 u64 objectid)
d97e63b6 929{
cfaa7295 930 root->node = NULL;
a28ec197 931 root->commit_root = NULL;
db94535d
CM		 932 root->sectorsize = sectorsize;
933 root->nodesize = nodesize;
934 root->leafsize = leafsize;
87ee04eb 935 root->stripesize = stripesize;
123abc88 936 root->ref_cows = 0;
0b86a832 937 root->track_dirty = 0;
c71bf099 938 root->in_radix = 0;
d68fc57b
YZ		 939 root->orphan_item_inserted = 0;
940 root->orphan_cleanup_state = 0;
0b86a832 941
9f5fae2f 942 root->fs_info = fs_info;
0f7d52f4
CM		 943 root->objectid = objectid;
944 root->last_trans = 0;
13a8a7c8 945 root->highest_objectid = 0;
58176a96 946 root->name = NULL;
4313b399 947 root->in_sysfs = 0;
6bef4d31 948 root->inode_tree = RB_ROOT;
f0486c68 949 root->block_rsv = NULL;
d68fc57b 950 root->orphan_block_rsv = NULL;
0b86a832
CM		 951
952 INIT_LIST_HEAD(&root->dirty_list);
7b128766 953 INIT_LIST_HEAD(&root->orphan_list);
5d4f98a2 954 INIT_LIST_HEAD(&root->root_list);
925baedd 955 spin_lock_init(&root->node_lock);
d68fc57b 956 spin_lock_init(&root->orphan_lock);
5d4f98a2 957 spin_lock_init(&root->inode_lock);
f0486c68 958 spin_lock_init(&root->accounting_lock);
a2135011 959 mutex_init(&root->objectid_mutex);
e02119d5 960 mutex_init(&root->log_mutex);
7237f183
YZ		 961 init_waitqueue_head(&root->log_writer_wait);
962 init_waitqueue_head(&root->log_commit_wait[0]);
963 init_waitqueue_head(&root->log_commit_wait[1]);
964 atomic_set(&root->log_commit[0], 0);
965 atomic_set(&root->log_commit[1], 0);
966 atomic_set(&root->log_writers, 0);
967 root->log_batch = 0;
968 root->log_transid = 0;
257c62e1 969 root->last_log_commit = 0;
d0c803c4
CM		 970 extent_io_tree_init(&root->dirty_log_pages,
971 fs_info->btree_inode->i_mapping, GFP_NOFS);
017e5369 972
3768f368
CM		 973 memset(&root->root_key, 0, sizeof(root->root_key));
974 memset(&root->root_item, 0, sizeof(root->root_item));
6702ed49 975 memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
58176a96 976 memset(&root->root_kobj, 0, sizeof(root->root_kobj));
3f157a2f 977 root->defrag_trans_start = fs_info->generation;
58176a96 978 init_completion(&root->kobj_unregister);
6702ed49 979 root->defrag_running = 0;
4d775673 980 root->root_key.objectid = objectid;
3394e160
CM		 981 root->anon_super.s_root = NULL;
982 root->anon_super.s_dev = 0;
983 INIT_LIST_HEAD(&root->anon_super.s_list);
984 INIT_LIST_HEAD(&root->anon_super.s_instances);
985 init_rwsem(&root->anon_super.s_umount);
986
3768f368
CM		 987 return 0;
988}
989
db94535d 990static int find_and_setup_root(struct btrfs_root *tree_root,
9f5fae2f
CM		 991 struct btrfs_fs_info *fs_info,
992 u64 objectid,
e20d96d6 993 struct btrfs_root *root)
3768f368
CM		 994{
995 int ret;
db94535d 996 u32 blocksize;
84234f3a 997 u64 generation;
3768f368 998
db94535d 999 __setup_root(tree_root->nodesize, tree_root->leafsize,
87ee04eb
CM		 1000 tree_root->sectorsize, tree_root->stripesize,
1001 root, fs_info, objectid);
3768f368
CM		 1002 ret = btrfs_find_last_root(tree_root, objectid,
1003 &root->root_item, &root->root_key);
4df27c4d
YZ		 1004 if (ret > 0)
1005 return -ENOENT;
3768f368
CM		 1006 BUG_ON(ret);
1007
84234f3a 1008 generation = btrfs_root_generation(&root->root_item);
db94535d
CM		 1009 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
1010 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
84234f3a 1011 blocksize, generation);
3768f368 1012 BUG_ON(!root->node);
4df27c4d 1013 root->commit_root = btrfs_root_node(root);
d97e63b6
CM		 1014 return 0;
1015}
1016
7237f183
YZ		 1017static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans,
1018 struct btrfs_fs_info *fs_info)
0f7d52f4
CM		 1019{
1020 struct btrfs_root *root;
1021 struct btrfs_root *tree_root = fs_info->tree_root;
7237f183 1022 struct extent_buffer *leaf;
e02119d5
CM		 1023
1024 root = kzalloc(sizeof(*root), GFP_NOFS);
1025 if (!root)
7237f183 1026 return ERR_PTR(-ENOMEM);
e02119d5
CM		 1027
1028 __setup_root(tree_root->nodesize, tree_root->leafsize,
1029 tree_root->sectorsize, tree_root->stripesize,
1030 root, fs_info, BTRFS_TREE_LOG_OBJECTID);
1031
1032 root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID;
1033 root->root_key.type = BTRFS_ROOT_ITEM_KEY;
1034 root->root_key.offset = BTRFS_TREE_LOG_OBJECTID;
7237f183
YZ		 1035 /*
1036 * log trees do not get reference counted because they go away
1037 * before a real commit is actually done. They do store pointers
1038 * to file data extents, and those reference counts still get
1039 * updated (along with back refs to the log tree).
1040 */
e02119d5
CM		 1041 root->ref_cows = 0;
1042
5d4f98a2
YZ		 1043 leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0,
1044 BTRFS_TREE_LOG_OBJECTID, NULL, 0, 0, 0);
7237f183
YZ		 1045 if (IS_ERR(leaf)) {
1046 kfree(root);
1047 return ERR_CAST(leaf);
1048 }
e02119d5 1049
5d4f98a2
YZ		 1050 memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
1051 btrfs_set_header_bytenr(leaf, leaf->start);
1052 btrfs_set_header_generation(leaf, trans->transid);
1053 btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
1054 btrfs_set_header_owner(leaf, BTRFS_TREE_LOG_OBJECTID);
7237f183 1055 root->node = leaf;
e02119d5
CM		 1056
1057 write_extent_buffer(root->node, root->fs_info->fsid,
1058 (unsigned long)btrfs_header_fsid(root->node),
1059 BTRFS_FSID_SIZE);
1060 btrfs_mark_buffer_dirty(root->node);
1061 btrfs_tree_unlock(root->node);
7237f183
YZ		 1062 return root;
1063}
1064
1065int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
1066 struct btrfs_fs_info *fs_info)
1067{
1068 struct btrfs_root *log_root;
1069
1070 log_root = alloc_log_tree(trans, fs_info);
1071 if (IS_ERR(log_root))
1072 return PTR_ERR(log_root);
1073 WARN_ON(fs_info->log_root_tree);
1074 fs_info->log_root_tree = log_root;
1075 return 0;
1076}
1077
1078int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
1079 struct btrfs_root *root)
1080{
1081 struct btrfs_root *log_root;
1082 struct btrfs_inode_item *inode_item;
1083
1084 log_root = alloc_log_tree(trans, root->fs_info);
1085 if (IS_ERR(log_root))
1086 return PTR_ERR(log_root);
1087
1088 log_root->last_trans = trans->transid;
1089 log_root->root_key.offset = root->root_key.objectid;
1090
1091 inode_item = &log_root->root_item.inode;
1092 inode_item->generation = cpu_to_le64(1);
1093 inode_item->size = cpu_to_le64(3);
1094 inode_item->nlink = cpu_to_le32(1);
1095 inode_item->nbytes = cpu_to_le64(root->leafsize);
1096 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
1097
5d4f98a2 1098 btrfs_set_root_node(&log_root->root_item, log_root->node);
7237f183
YZ		 1099
1100 WARN_ON(root->log_root);
1101 root->log_root = log_root;
1102 root->log_transid = 0;
257c62e1 1103 root->last_log_commit = 0;
e02119d5
CM		 1104 return 0;
1105}
1106
1107struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root,
1108 struct btrfs_key *location)
1109{
1110 struct btrfs_root *root;
1111 struct btrfs_fs_info *fs_info = tree_root->fs_info;
0f7d52f4 1112 struct btrfs_path *path;
5f39d397 1113 struct extent_buffer *l;
84234f3a 1114 u64 generation;
db94535d 1115 u32 blocksize;
0f7d52f4
CM		 1116 int ret = 0;
1117
5eda7b5e 1118 root = kzalloc(sizeof(*root), GFP_NOFS);
0cf6c620 1119 if (!root)
0f7d52f4 1120 return ERR_PTR(-ENOMEM);
0f7d52f4 1121 if (location->offset == (u64)-1) {
db94535d 1122 ret = find_and_setup_root(tree_root, fs_info,
0f7d52f4
CM		 1123 location->objectid, root);
1124 if (ret) {
0f7d52f4
CM		 1125 kfree(root);
1126 return ERR_PTR(ret);
1127 }
13a8a7c8 1128 goto out;
0f7d52f4
CM		 1129 }
1130
db94535d 1131 __setup_root(tree_root->nodesize, tree_root->leafsize,
87ee04eb
CM		 1132 tree_root->sectorsize, tree_root->stripesize,
1133 root, fs_info, location->objectid);
0f7d52f4
CM		 1134
1135 path = btrfs_alloc_path();
1136 BUG_ON(!path);
1137 ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
13a8a7c8
YZ		 1138 if (ret == 0) {
1139 l = path->nodes[0];
1140 read_extent_buffer(l, &root->root_item,
1141 btrfs_item_ptr_offset(l, path->slots[0]),
1142 sizeof(root->root_item));
1143 memcpy(&root->root_key, location, sizeof(*location));
0f7d52f4 1144 }
0f7d52f4
CM		 1145 btrfs_free_path(path);
1146 if (ret) {
13a8a7c8
YZ		 1147 if (ret > 0)
1148 ret = -ENOENT;
0f7d52f4
CM		 1149 return ERR_PTR(ret);
1150 }
13a8a7c8 1151
84234f3a 1152 generation = btrfs_root_generation(&root->root_item);
db94535d
CM		 1153 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
1154 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
84234f3a 1155 blocksize, generation);
5d4f98a2 1156 root->commit_root = btrfs_root_node(root);
0f7d52f4 1157 BUG_ON(!root->node);
13a8a7c8
YZ		 1158out:
1159 if (location->objectid != BTRFS_TREE_LOG_OBJECTID)
e02119d5 1160 root->ref_cows = 1;
13a8a7c8 1161
5eda7b5e
CM		 1162 return root;
1163}
1164
dc17ff8f
CM		 1165struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
1166 u64 root_objectid)
1167{
1168 struct btrfs_root *root;
1169
1170 if (root_objectid == BTRFS_ROOT_TREE_OBJECTID)
1171 return fs_info->tree_root;
1172 if (root_objectid == BTRFS_EXTENT_TREE_OBJECTID)
1173 return fs_info->extent_root;
1174
1175 root = radix_tree_lookup(&fs_info->fs_roots_radix,
1176 (unsigned long)root_objectid);
1177 return root;
1178}
1179
edbd8d4e
CM		 1180struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
1181 struct btrfs_key *location)
5eda7b5e
CM		 1182{
1183 struct btrfs_root *root;
1184 int ret;
1185
edbd8d4e
CM		 1186 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
1187 return fs_info->tree_root;
1188 if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
1189 return fs_info->extent_root;
8f18cf13
CM		 1190 if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
1191 return fs_info->chunk_root;
1192 if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
1193 return fs_info->dev_root;
0403e47e
YZ		 1194 if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
1195 return fs_info->csum_root;
4df27c4d
YZ		 1196again:
1197 spin_lock(&fs_info->fs_roots_radix_lock);
5eda7b5e
CM		 1198 root = radix_tree_lookup(&fs_info->fs_roots_radix,
1199 (unsigned long)location->objectid);
4df27c4d 1200 spin_unlock(&fs_info->fs_roots_radix_lock);
5eda7b5e
CM		 1201 if (root)
1202 return root;
1203
e02119d5 1204 root = btrfs_read_fs_root_no_radix(fs_info->tree_root, location);
5eda7b5e
CM		 1205 if (IS_ERR(root))
1206 return root;
3394e160
CM		 1207
1208 set_anon_super(&root->anon_super, NULL);
1209
d68fc57b
YZ		 1210 if (btrfs_root_refs(&root->root_item) == 0) {
1211 ret = -ENOENT;
1212 goto fail;
1213 }
1214
1215 ret = btrfs_find_orphan_item(fs_info->tree_root, location->objectid);
1216 if (ret < 0)
1217 goto fail;
1218 if (ret == 0)
1219 root->orphan_item_inserted = 1;
1220
4df27c4d
YZ		 1221 ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM);
1222 if (ret)
1223 goto fail;
1224
1225 spin_lock(&fs_info->fs_roots_radix_lock);
2619ba1f
CM		 1226 ret = radix_tree_insert(&fs_info->fs_roots_radix,
1227 (unsigned long)root->root_key.objectid,
0f7d52f4 1228 root);
d68fc57b 1229 if (ret == 0)
4df27c4d 1230 root->in_radix = 1;
d68fc57b 1231
4df27c4d
YZ		 1232 spin_unlock(&fs_info->fs_roots_radix_lock);
1233 radix_tree_preload_end();
0f7d52f4 1234 if (ret) {
4df27c4d
YZ		 1235 if (ret == -EEXIST) {
1236 free_fs_root(root);
1237 goto again;
1238 }
1239 goto fail;
0f7d52f4 1240 }
4df27c4d
YZ		 1241
1242 ret = btrfs_find_dead_roots(fs_info->tree_root,
1243 root->root_key.objectid);
1244 WARN_ON(ret);
edbd8d4e 1245 return root;
4df27c4d
YZ		 1246fail:
1247 free_fs_root(root);
1248 return ERR_PTR(ret);
edbd8d4e
CM		 1249}
1250
1251struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
1252 struct btrfs_key *location,
1253 const char *name, int namelen)
1254{
4df27c4d
YZ		 1255 return btrfs_read_fs_root_no_name(fs_info, location);
1256#if 0
edbd8d4e
CM		 1257 struct btrfs_root *root;
1258 int ret;
1259
1260 root = btrfs_read_fs_root_no_name(fs_info, location);
1261 if (!root)
1262 return NULL;
58176a96 1263
4313b399
CM		 1264 if (root->in_sysfs)
1265 return root;
1266
58176a96
JB		 1267 ret = btrfs_set_root_name(root, name, namelen);
1268 if (ret) {
5f39d397 1269 free_extent_buffer(root->node);
58176a96
JB		 1270 kfree(root);
1271 return ERR_PTR(ret);
1272 }
4df27c4d 1273
58176a96
JB		 1274 ret = btrfs_sysfs_add_root(root);
1275 if (ret) {
5f39d397 1276 free_extent_buffer(root->node);
58176a96
JB		 1277 kfree(root->name);
1278 kfree(root);
1279 return ERR_PTR(ret);
1280 }
4313b399 1281 root->in_sysfs = 1;
0f7d52f4 1282 return root;
4df27c4d 1283#endif
0f7d52f4 1284}
04160088
CM		 1285
1286static int btrfs_congested_fn(void *congested_data, int bdi_bits)
1287{
1288 struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data;
1289 int ret = 0;
04160088
CM		 1290 struct btrfs_device *device;
1291 struct backing_dev_info *bdi;
b7967db7 1292
c6e30871 1293 list_for_each_entry(device, &info->fs_devices->devices, dev_list) {
dfe25020
CM		 1294 if (!device->bdev)
1295 continue;
04160088
CM		 1296 bdi = blk_get_backing_dev_info(device->bdev);
1297 if (bdi && bdi_congested(bdi, bdi_bits)) {
1298 ret = 1;
1299 break;
1300 }
1301 }
1302 return ret;
1303}
1304
38b66988
CM		 1305/*
1306 * this unplugs every device on the box, and it is only used when page
1307 * is null
1308 */
1309static void __unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
1310{
38b66988
CM		 1311 struct btrfs_device *device;
1312 struct btrfs_fs_info *info;
1313
1314 info = (struct btrfs_fs_info *)bdi->unplug_io_data;
c6e30871 1315 list_for_each_entry(device, &info->fs_devices->devices, dev_list) {
d20f7043
CM		 1316 if (!device->bdev)
1317 continue;
1318
38b66988 1319 bdi = blk_get_backing_dev_info(device->bdev);
d397712b 1320 if (bdi->unplug_io_fn)
38b66988 1321 bdi->unplug_io_fn(bdi, page);
38b66988
CM		 1322 }
1323}
1324
b2950863 1325static void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
04160088 1326{
38b66988 1327 struct inode *inode;
f2d8d74d
CM		 1328 struct extent_map_tree *em_tree;
1329 struct extent_map *em;
bcbfce8a 1330 struct address_space *mapping;
38b66988
CM		 1331 u64 offset;
1332
bcbfce8a 1333 /* the generic O_DIRECT read code does this */
9f0ba5bd 1334 if (1 || !page) {
38b66988
CM		 1335 __unplug_io_fn(bdi, page);
1336 return;
1337 }
1338
bcbfce8a
CM		 1339 /*
1340 * page->mapping may change at any time. Get a consistent copy
1341 * and use that for everything below
1342 */
1343 smp_mb();
1344 mapping = page->mapping;
1345 if (!mapping)
1346 return;
1347
1348 inode = mapping->host;
240d5d48
CM		 1349
1350 /*
1351 * don't do the expensive searching for a small number of
1352 * devices
1353 */
1354 if (BTRFS_I(inode)->root->fs_info->fs_devices->open_devices <= 2) {
1355 __unplug_io_fn(bdi, page);
1356 return;
1357 }
1358
38b66988 1359 offset = page_offset(page);
04160088 1360
f2d8d74d 1361 em_tree = &BTRFS_I(inode)->extent_tree;
890871be 1362 read_lock(&em_tree->lock);
f2d8d74d 1363 em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);
890871be 1364 read_unlock(&em_tree->lock);
89642229
CM		 1365 if (!em) {
1366 __unplug_io_fn(bdi, page);
f2d8d74d 1367 return;
89642229 1368 }
f2d8d74d 1369
89642229
CM		 1370 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
1371 free_extent_map(em);
1372 __unplug_io_fn(bdi, page);
1373 return;
1374 }
f2d8d74d
CM		 1375 offset = offset - em->start;
1376 btrfs_unplug_page(&BTRFS_I(inode)->root->fs_info->mapping_tree,
1377 em->block_start + offset, page);
1378 free_extent_map(em);
04160088
CM		 1379}
1380
ad081f14
JA		 1381/*
1382 * If this fails, caller must call bdi_destroy() to get rid of the
1383 * bdi again.
1384 */
04160088
CM		 1385static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi)
1386{
ad081f14
JA		 1387 int err;
1388
1389 bdi->capabilities = BDI_CAP_MAP_COPY;
e6d086d8 1390 err = bdi_setup_and_register(bdi, "btrfs", BDI_CAP_MAP_COPY);
ad081f14
JA		 1391 if (err)
1392 return err;
1393
4575c9cc 1394 bdi->ra_pages = default_backing_dev_info.ra_pages;
04160088
CM		 1395 bdi->unplug_io_fn = btrfs_unplug_io_fn;
1396 bdi->unplug_io_data = info;
1397 bdi->congested_fn = btrfs_congested_fn;
1398 bdi->congested_data = info;
1399 return 0;
1400}
1401
ce9adaa5
CM		 1402static int bio_ready_for_csum(struct bio *bio)
1403{
1404 u64 length = 0;
1405 u64 buf_len = 0;
1406 u64 start = 0;
1407 struct page *page;
1408 struct extent_io_tree *io_tree = NULL;
ce9adaa5
CM		 1409 struct bio_vec *bvec;
1410 int i;
1411 int ret;
1412
1413 bio_for_each_segment(bvec, bio, i) {
1414 page = bvec->bv_page;
1415 if (page->private == EXTENT_PAGE_PRIVATE) {
1416 length += bvec->bv_len;
1417 continue;
1418 }
1419 if (!page->private) {
1420 length += bvec->bv_len;
1421 continue;
1422 }
1423 length = bvec->bv_len;
1424 buf_len = page->private >> 2;
1425 start = page_offset(page) + bvec->bv_offset;
1426 io_tree = &BTRFS_I(page->mapping->host)->io_tree;
ce9adaa5
CM		 1427 }
1428 /* are we fully contained in this bio? */
1429 if (buf_len <= length)
1430 return 1;
1431
1432 ret = extent_range_uptodate(io_tree, start + length,
1433 start + buf_len - 1);
ce9adaa5
CM		 1434 return ret;
1435}
1436
8b712842
CM		 1437/*
1438 * called by the kthread helper functions to finally call the bio end_io
1439 * functions. This is where read checksum verification actually happens
1440 */
1441static void end_workqueue_fn(struct btrfs_work *work)
ce9adaa5 1442{
ce9adaa5 1443 struct bio *bio;
8b712842
CM		 1444 struct end_io_wq *end_io_wq;
1445 struct btrfs_fs_info *fs_info;
ce9adaa5 1446 int error;
ce9adaa5 1447
8b712842
CM		 1448 end_io_wq = container_of(work, struct end_io_wq, work);
1449 bio = end_io_wq->bio;
1450 fs_info = end_io_wq->info;
ce9adaa5 1451
cad321ad 1452 /* metadata bio reads are special because the whole tree block must
8b712842
CM		 1453 * be checksummed at once. This makes sure the entire block is in
1454 * ram and up to date before trying to verify things. For
1455 * blocksize <= pagesize, it is basically a noop
1456 */
7b6d91da 1457 if (!(bio->bi_rw & REQ_WRITE) && end_io_wq->metadata &&
cad321ad 1458 !bio_ready_for_csum(bio)) {
d20f7043 1459 btrfs_queue_worker(&fs_info->endio_meta_workers,
8b712842
CM		 1460 &end_io_wq->work);
1461 return;
1462 }
1463 error = end_io_wq->error;
1464 bio->bi_private = end_io_wq->private;
1465 bio->bi_end_io = end_io_wq->end_io;
1466 kfree(end_io_wq);
8b712842 1467 bio_endio(bio, error);
44b8bd7e
CM		 1468}
1469
a74a4b97
CM		 1470static int cleaner_kthread(void *arg)
1471{
1472 struct btrfs_root *root = arg;
1473
1474 do {
a74a4b97 1475 vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE);
76dda93c
YZ		 1476
1477 if (!(root->fs_info->sb->s_flags & MS_RDONLY) &&
1478 mutex_trylock(&root->fs_info->cleaner_mutex)) {
24bbcf04 1479 btrfs_run_delayed_iputs(root);
76dda93c
YZ		 1480 btrfs_clean_old_snapshots(root);
1481 mutex_unlock(&root->fs_info->cleaner_mutex);
1482 }
a74a4b97
CM		 1483
1484 if (freezing(current)) {
1485 refrigerator();
1486 } else {
a74a4b97 1487 set_current_state(TASK_INTERRUPTIBLE);
8929ecfa
YZ		 1488 if (!kthread_should_stop())
1489 schedule();
a74a4b97
CM		 1490 __set_current_state(TASK_RUNNING);
1491 }
1492 } while (!kthread_should_stop());
1493 return 0;
1494}
1495
1496static int transaction_kthread(void *arg)
1497{
1498 struct btrfs_root *root = arg;
1499 struct btrfs_trans_handle *trans;
1500 struct btrfs_transaction *cur;
8929ecfa 1501 u64 transid;
a74a4b97
CM		 1502 unsigned long now;
1503 unsigned long delay;
1504 int ret;
1505
1506 do {
a74a4b97
CM		 1507 delay = HZ * 30;
1508 vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE);
1509 mutex_lock(&root->fs_info->transaction_kthread_mutex);
1510
8929ecfa 1511 spin_lock(&root->fs_info->new_trans_lock);
a74a4b97
CM		 1512 cur = root->fs_info->running_transaction;
1513 if (!cur) {
8929ecfa 1514 spin_unlock(&root->fs_info->new_trans_lock);
a74a4b97
CM		 1515 goto sleep;
1516 }
31153d81 1517
a74a4b97 1518 now = get_seconds();
8929ecfa
YZ		 1519 if (!cur->blocked &&
1520 (now < cur->start_time || now - cur->start_time < 30)) {
1521 spin_unlock(&root->fs_info->new_trans_lock);
a74a4b97
CM		 1522 delay = HZ * 5;
1523 goto sleep;
1524 }
8929ecfa
YZ		 1525 transid = cur->transid;
1526 spin_unlock(&root->fs_info->new_trans_lock);
56bec294 1527
8929ecfa
YZ		 1528 trans = btrfs_join_transaction(root, 1);
1529 if (transid == trans->transid) {
1530 ret = btrfs_commit_transaction(trans, root);
1531 BUG_ON(ret);
1532 } else {
1533 btrfs_end_transaction(trans, root);
1534 }
a74a4b97
CM		 1535sleep:
1536 wake_up_process(root->fs_info->cleaner_kthread);
1537 mutex_unlock(&root->fs_info->transaction_kthread_mutex);
1538
1539 if (freezing(current)) {
1540 refrigerator();
1541 } else {
a74a4b97 1542 set_current_state(TASK_INTERRUPTIBLE);
8929ecfa
YZ		 1543 if (!kthread_should_stop() &&
1544 !btrfs_transaction_blocked(root->fs_info))
1545 schedule_timeout(delay);
a74a4b97
CM		 1546 __set_current_state(TASK_RUNNING);
1547 }
1548 } while (!kthread_should_stop());
1549 return 0;
1550}
1551
8a4b83cc 1552struct btrfs_root *open_ctree(struct super_block *sb,
dfe25020
CM		 1553 struct btrfs_fs_devices *fs_devices,
1554 char *options)
2e635a27 1555{
db94535d
CM		 1556 u32 sectorsize;
1557 u32 nodesize;
1558 u32 leafsize;
1559 u32 blocksize;
87ee04eb 1560 u32 stripesize;
84234f3a 1561 u64 generation;
f2b636e8 1562 u64 features;
3de4586c 1563 struct btrfs_key location;
a061fc8d 1564 struct buffer_head *bh;
e02119d5 1565 struct btrfs_root *extent_root = kzalloc(sizeof(struct btrfs_root),
e20d96d6 1566 GFP_NOFS);
d20f7043
CM		 1567 struct btrfs_root *csum_root = kzalloc(sizeof(struct btrfs_root),
1568 GFP_NOFS);
450ba0ea
JB		 1569 struct btrfs_root *tree_root = btrfs_sb(sb);
1570 struct btrfs_fs_info *fs_info = tree_root->fs_info;
e02119d5 1571 struct btrfs_root *chunk_root = kzalloc(sizeof(struct btrfs_root),
0b86a832 1572 GFP_NOFS);
e02119d5 1573 struct btrfs_root *dev_root = kzalloc(sizeof(struct btrfs_root),
0b86a832 1574 GFP_NOFS);
e02119d5
CM		 1575 struct btrfs_root *log_tree_root;
1576
eb60ceac 1577 int ret;
e58ca020 1578 int err = -EINVAL;
4543df7e 1579
2c90e5d6 1580 struct btrfs_super_block *disk_super;
8790d502 1581
0463bb4e 1582 if (!extent_root || !tree_root || !fs_info ||
d20f7043 1583 !chunk_root || !dev_root || !csum_root) {
39279cc3
CM		 1584 err = -ENOMEM;
1585 goto fail;
1586 }
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
1606 INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC);
8fd17795 1607 INIT_LIST_HEAD(&fs_info->trans_list);
facda1e7 1608 INIT_LIST_HEAD(&fs_info->dead_roots);
24bbcf04 1609 INIT_LIST_HEAD(&fs_info->delayed_iputs);
19c00ddc 1610 INIT_LIST_HEAD(&fs_info->hashers);
ea8c2819 1611 INIT_LIST_HEAD(&fs_info->delalloc_inodes);
5a3f23d5 1612 INIT_LIST_HEAD(&fs_info->ordered_operations);
11833d66 1613 INIT_LIST_HEAD(&fs_info->caching_block_groups);
1832a6d5 1614 spin_lock_init(&fs_info->delalloc_lock);
cee36a03 1615 spin_lock_init(&fs_info->new_trans_lock);
31153d81 1616 spin_lock_init(&fs_info->ref_cache_lock);
76dda93c 1617 spin_lock_init(&fs_info->fs_roots_radix_lock);
24bbcf04 1618 spin_lock_init(&fs_info->delayed_iput_lock);
19c00ddc 1619
58176a96 1620 init_completion(&fs_info->kobj_unregister);
9f5fae2f
CM		 1621 fs_info->tree_root = tree_root;
1622 fs_info->extent_root = extent_root;
d20f7043 1623 fs_info->csum_root = csum_root;
0b86a832
CM		 1624 fs_info->chunk_root = chunk_root;
1625 fs_info->dev_root = dev_root;
8a4b83cc 1626 fs_info->fs_devices = fs_devices;
0b86a832 1627 INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
6324fbf3 1628 INIT_LIST_HEAD(&fs_info->space_info);
0b86a832 1629 btrfs_mapping_init(&fs_info->mapping_tree);
f0486c68
YZ		 1630 btrfs_init_block_rsv(&fs_info->global_block_rsv);
1631 btrfs_init_block_rsv(&fs_info->delalloc_block_rsv);
1632 btrfs_init_block_rsv(&fs_info->trans_block_rsv);
1633 btrfs_init_block_rsv(&fs_info->chunk_block_rsv);
1634 btrfs_init_block_rsv(&fs_info->empty_block_rsv);
1635 INIT_LIST_HEAD(&fs_info->durable_block_rsv_list);
1636 mutex_init(&fs_info->durable_block_rsv_mutex);
cb03c743 1637 atomic_set(&fs_info->nr_async_submits, 0);
771ed689 1638 atomic_set(&fs_info->async_delalloc_pages, 0);
8c8bee1d 1639 atomic_set(&fs_info->async_submit_draining, 0);
0986fe9e 1640 atomic_set(&fs_info->nr_async_bios, 0);
e20d96d6 1641 fs_info->sb = sb;
6f568d35 1642 fs_info->max_inline = 8192 * 1024;
9ed74f2d 1643 fs_info->metadata_ratio = 0;
c8b97818 1644
b34b086c
CM		 1645 fs_info->thread_pool_size = min_t(unsigned long,
1646 num_online_cpus() + 2, 8);
0afbaf8c 1647
3eaa2885
CM		 1648 INIT_LIST_HEAD(&fs_info->ordered_extents);
1649 spin_lock_init(&fs_info->ordered_extent_lock);
1650
a061fc8d
CM		 1651 sb->s_blocksize = 4096;
1652 sb->s_blocksize_bits = blksize_bits(4096);
32a88aa1 1653 sb->s_bdi = &fs_info->bdi;
a061fc8d 1654
76dda93c
YZ		 1655 fs_info->btree_inode->i_ino = BTRFS_BTREE_INODE_OBJECTID;
1656 fs_info->btree_inode->i_nlink = 1;
0afbaf8c
CM		 1657 /*
1658 * we set the i_size on the btree inode to the max possible int.
1659 * the real end of the address space is determined by all of
1660 * the devices in the system
1661 */
1662 fs_info->btree_inode->i_size = OFFSET_MAX;
d98237b3 1663 fs_info->btree_inode->i_mapping->a_ops = &btree_aops;
04160088
CM		 1664 fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi;
1665
5d4f98a2 1666 RB_CLEAR_NODE(&BTRFS_I(fs_info->btree_inode)->rb_node);
d1310b2e 1667 extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree,
5f39d397
CM		 1668 fs_info->btree_inode->i_mapping,
1669 GFP_NOFS);
d1310b2e
CM		 1670 extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree,
1671 GFP_NOFS);
1672
1673 BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops;
0da5468f 1674
76dda93c
YZ		 1675 BTRFS_I(fs_info->btree_inode)->root = tree_root;
1676 memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
1677 sizeof(struct btrfs_key));
1678 BTRFS_I(fs_info->btree_inode)->dummy_inode = 1;
c65ddb52 1679 insert_inode_hash(fs_info->btree_inode);
76dda93c 1680
0f9dd46c 1681 spin_lock_init(&fs_info->block_group_cache_lock);
6bef4d31 1682 fs_info->block_group_cache_tree = RB_ROOT;
0f9dd46c 1683
11833d66 1684 extent_io_tree_init(&fs_info->freed_extents[0],
1a5bc167 1685 fs_info->btree_inode->i_mapping, GFP_NOFS);
11833d66
YZ		 1686 extent_io_tree_init(&fs_info->freed_extents[1],
1687 fs_info->btree_inode->i_mapping, GFP_NOFS);
1688 fs_info->pinned_extents = &fs_info->freed_extents[0];
e66f709b 1689 fs_info->do_barriers = 1;
e18e4809 1690
39279cc3 1691
79154b1b 1692 mutex_init(&fs_info->trans_mutex);
5a3f23d5 1693 mutex_init(&fs_info->ordered_operations_mutex);
e02119d5 1694 mutex_init(&fs_info->tree_log_mutex);
925baedd 1695 mutex_init(&fs_info->chunk_mutex);
a74a4b97
CM		 1696 mutex_init(&fs_info->transaction_kthread_mutex);
1697 mutex_init(&fs_info->cleaner_mutex);
7d9eb12c 1698 mutex_init(&fs_info->volume_mutex);
276e680d 1699 init_rwsem(&fs_info->extent_commit_sem);
c71bf099 1700 init_rwsem(&fs_info->cleanup_work_sem);
76dda93c 1701 init_rwsem(&fs_info->subvol_sem);
fa9c0d79
CM		 1702
1703 btrfs_init_free_cluster(&fs_info->meta_alloc_cluster);
1704 btrfs_init_free_cluster(&fs_info->data_alloc_cluster);
1705
e6dcd2dc 1706 init_waitqueue_head(&fs_info->transaction_throttle);
f9295749 1707 init_waitqueue_head(&fs_info->transaction_wait);
bb9c12c9 1708 init_waitqueue_head(&fs_info->transaction_blocked_wait);
4854ddd0 1709 init_waitqueue_head(&fs_info->async_submit_wait);
3768f368 1710
0b86a832 1711 __setup_root(4096, 4096, 4096, 4096, tree_root,
2c90e5d6 1712 fs_info, BTRFS_ROOT_TREE_OBJECTID);
7eccb903 1713
a512bbf8 1714 bh = btrfs_read_dev_super(fs_devices->latest_bdev);
a061fc8d 1715 if (!bh)
39279cc3 1716 goto fail_iput;
39279cc3 1717
a061fc8d 1718 memcpy(&fs_info->super_copy, bh->b_data, sizeof(fs_info->super_copy));
2d69a0f8
YZ		 1719 memcpy(&fs_info->super_for_commit, &fs_info->super_copy,
1720 sizeof(fs_info->super_for_commit));
a061fc8d 1721 brelse(bh);
5f39d397 1722
a061fc8d 1723 memcpy(fs_info->fsid, fs_info->super_copy.fsid, BTRFS_FSID_SIZE);
0b86a832 1724
5f39d397 1725 disk_super = &fs_info->super_copy;
0f7d52f4 1726 if (!btrfs_super_root(disk_super))
c6e2bac1 1727 goto fail_iput;
0f7d52f4 1728
2b82032c
YZ		 1729 ret = btrfs_parse_options(tree_root, options);
1730 if (ret) {
1731 err = ret;
c6e2bac1 1732 goto fail_iput;
2b82032c 1733 }
dfe25020 1734
f2b636e8
JB		 1735 features = btrfs_super_incompat_flags(disk_super) &
1736 ~BTRFS_FEATURE_INCOMPAT_SUPP;
1737 if (features) {
1738 printk(KERN_ERR "BTRFS: couldn't mount because of "
1739 "unsupported optional features (%Lx).\n",
21380931 1740 (unsigned long long)features);
f2b636e8 1741 err = -EINVAL;
c6e2bac1 1742 goto fail_iput;
f2b636e8
JB		 1743 }
1744
5d4f98a2
YZ		 1745 features = btrfs_super_incompat_flags(disk_super);
1746 if (!(features & BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF)) {
1747 features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
1748 btrfs_set_super_incompat_flags(disk_super, features);
1749 }
1750
f2b636e8
JB		 1751 features = btrfs_super_compat_ro_flags(disk_super) &
1752 ~BTRFS_FEATURE_COMPAT_RO_SUPP;
1753 if (!(sb->s_flags & MS_RDONLY) && features) {
1754 printk(KERN_ERR "BTRFS: couldn't mount RDWR because of "
1755 "unsupported option features (%Lx).\n",
21380931 1756 (unsigned long long)features);
f2b636e8 1757 err = -EINVAL;
c6e2bac1 1758 goto fail_iput;
f2b636e8 1759 }
61d92c32
CM		 1760
1761 btrfs_init_workers(&fs_info->generic_worker,
1762 "genwork", 1, NULL);
1763
5443be45 1764 btrfs_init_workers(&fs_info->workers, "worker",
61d92c32
CM		 1765 fs_info->thread_pool_size,
1766 &fs_info->generic_worker);
c8b97818 1767
771ed689 1768 btrfs_init_workers(&fs_info->delalloc_workers, "delalloc",
61d92c32
CM		 1769 fs_info->thread_pool_size,
1770 &fs_info->generic_worker);
771ed689 1771
5443be45 1772 btrfs_init_workers(&fs_info->submit_workers, "submit",
b720d209 1773 min_t(u64, fs_devices->num_devices,
61d92c32
CM		 1774 fs_info->thread_pool_size),
1775 &fs_info->generic_worker);
61b49440
CM		 1776
1777 /* a higher idle thresh on the submit workers makes it much more
1778 * likely that bios will be send down in a sane order to the
1779 * devices
1780 */
1781 fs_info->submit_workers.idle_thresh = 64;
53863232 1782
771ed689 1783 fs_info->workers.idle_thresh = 16;
4a69a410 1784 fs_info->workers.ordered = 1;
61b49440 1785
771ed689
CM		 1786 fs_info->delalloc_workers.idle_thresh = 2;
1787 fs_info->delalloc_workers.ordered = 1;
1788
61d92c32
CM		 1789 btrfs_init_workers(&fs_info->fixup_workers, "fixup", 1,
1790 &fs_info->generic_worker);
5443be45 1791 btrfs_init_workers(&fs_info->endio_workers, "endio",
61d92c32
CM		 1792 fs_info->thread_pool_size,
1793 &fs_info->generic_worker);
d20f7043 1794 btrfs_init_workers(&fs_info->endio_meta_workers, "endio-meta",
61d92c32
CM		 1795 fs_info->thread_pool_size,
1796 &fs_info->generic_worker);
cad321ad 1797 btrfs_init_workers(&fs_info->endio_meta_write_workers,
61d92c32
CM		 1798 "endio-meta-write", fs_info->thread_pool_size,
1799 &fs_info->generic_worker);
5443be45 1800 btrfs_init_workers(&fs_info->endio_write_workers, "endio-write",
61d92c32
CM		 1801 fs_info->thread_pool_size,
1802 &fs_info->generic_worker);
0cb59c99
JB		 1803 btrfs_init_workers(&fs_info->endio_freespace_worker, "freespace-write",
1804 1, &fs_info->generic_worker);
61b49440
CM		 1805
1806 /*
1807 * endios are largely parallel and should have a very
1808 * low idle thresh
1809 */
1810 fs_info->endio_workers.idle_thresh = 4;
b51912c9
CM		 1811 fs_info->endio_meta_workers.idle_thresh = 4;
1812
9042846b
CM		 1813 fs_info->endio_write_workers.idle_thresh = 2;
1814 fs_info->endio_meta_write_workers.idle_thresh = 2;
1815
4543df7e 1816 btrfs_start_workers(&fs_info->workers, 1);
61d92c32 1817 btrfs_start_workers(&fs_info->generic_worker, 1);
1cc127b5 1818 btrfs_start_workers(&fs_info->submit_workers, 1);
771ed689 1819 btrfs_start_workers(&fs_info->delalloc_workers, 1);
247e743c 1820 btrfs_start_workers(&fs_info->fixup_workers, 1);
9042846b
CM		 1821 btrfs_start_workers(&fs_info->endio_workers, 1);
1822 btrfs_start_workers(&fs_info->endio_meta_workers, 1);
1823 btrfs_start_workers(&fs_info->endio_meta_write_workers, 1);
1824 btrfs_start_workers(&fs_info->endio_write_workers, 1);
0cb59c99 1825 btrfs_start_workers(&fs_info->endio_freespace_worker, 1);
4543df7e 1826
4575c9cc 1827 fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super);
c8b97818
CM		 1828 fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages,
1829 4 * 1024 * 1024 / PAGE_CACHE_SIZE);
4575c9cc 1830
db94535d
CM		 1831 nodesize = btrfs_super_nodesize(disk_super);
1832 leafsize = btrfs_super_leafsize(disk_super);
1833 sectorsize = btrfs_super_sectorsize(disk_super);
87ee04eb 1834 stripesize = btrfs_super_stripesize(disk_super);
db94535d
CM		 1835 tree_root->nodesize = nodesize;
1836 tree_root->leafsize = leafsize;
1837 tree_root->sectorsize = sectorsize;
87ee04eb 1838 tree_root->stripesize = stripesize;
a061fc8d
CM		 1839
1840 sb->s_blocksize = sectorsize;
1841 sb->s_blocksize_bits = blksize_bits(sectorsize);
db94535d 1842
39279cc3
CM		 1843 if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
1844 sizeof(disk_super->magic))) {
d397712b 1845 printk(KERN_INFO "btrfs: valid FS not found on %s\n", sb->s_id);
39279cc3
CM		 1846 goto fail_sb_buffer;
1847 }
19c00ddc 1848
925baedd 1849 mutex_lock(&fs_info->chunk_mutex);
e4404d6e 1850 ret = btrfs_read_sys_array(tree_root);
925baedd 1851 mutex_unlock(&fs_info->chunk_mutex);
84eed90f 1852 if (ret) {
d397712b
CM		 1853 printk(KERN_WARNING "btrfs: failed to read the system "
1854 "array on %s\n", sb->s_id);
5d4f98a2 1855 goto fail_sb_buffer;
84eed90f 1856 }
0b86a832
CM		 1857
1858 blocksize = btrfs_level_size(tree_root,
1859 btrfs_super_chunk_root_level(disk_super));
84234f3a 1860 generation = btrfs_super_chunk_root_generation(disk_super);
0b86a832
CM		 1861
1862 __setup_root(nodesize, leafsize, sectorsize, stripesize,
1863 chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
1864
1865 chunk_root->node = read_tree_block(chunk_root,
1866 btrfs_super_chunk_root(disk_super),
84234f3a 1867 blocksize, generation);
0b86a832 1868 BUG_ON(!chunk_root->node);
83121942
DW		 1869 if (!test_bit(EXTENT_BUFFER_UPTODATE, &chunk_root->node->bflags)) {
1870 printk(KERN_WARNING "btrfs: failed to read chunk root on %s\n",
1871 sb->s_id);
1872 goto fail_chunk_root;
1873 }
5d4f98a2
YZ		 1874 btrfs_set_root_node(&chunk_root->root_item, chunk_root->node);
1875 chunk_root->commit_root = btrfs_root_node(chunk_root);
0b86a832 1876
e17cade2 1877 read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
d397712b
CM		 1878 (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node),
1879 BTRFS_UUID_SIZE);
e17cade2 1880
925baedd 1881 mutex_lock(&fs_info->chunk_mutex);
0b86a832 1882 ret = btrfs_read_chunk_tree(chunk_root);
925baedd 1883 mutex_unlock(&fs_info->chunk_mutex);
2b82032c 1884 if (ret) {
d397712b
CM		 1885 printk(KERN_WARNING "btrfs: failed to read chunk tree on %s\n",
1886 sb->s_id);
2b82032c
YZ		 1887 goto fail_chunk_root;
1888 }
0b86a832 1889
dfe25020
CM		 1890 btrfs_close_extra_devices(fs_devices);
1891
db94535d
CM		 1892 blocksize = btrfs_level_size(tree_root,
1893 btrfs_super_root_level(disk_super));
84234f3a 1894 generation = btrfs_super_generation(disk_super);
0b86a832 1895
e20d96d6 1896 tree_root->node = read_tree_block(tree_root,
db94535d 1897 btrfs_super_root(disk_super),
84234f3a 1898 blocksize, generation);
39279cc3 1899 if (!tree_root->node)
2b82032c 1900 goto fail_chunk_root;
83121942
DW		 1901 if (!test_bit(EXTENT_BUFFER_UPTODATE, &tree_root->node->bflags)) {
1902 printk(KERN_WARNING "btrfs: failed to read tree root on %s\n",
1903 sb->s_id);
1904 goto fail_tree_root;
1905 }
5d4f98a2
YZ		 1906 btrfs_set_root_node(&tree_root->root_item, tree_root->node);
1907 tree_root->commit_root = btrfs_root_node(tree_root);
db94535d
CM		 1908
1909 ret = find_and_setup_root(tree_root, fs_info,
e20d96d6 1910 BTRFS_EXTENT_TREE_OBJECTID, extent_root);
0b86a832 1911 if (ret)
39279cc3 1912 goto fail_tree_root;
0b86a832
CM		 1913 extent_root->track_dirty = 1;
1914
1915 ret = find_and_setup_root(tree_root, fs_info,
1916 BTRFS_DEV_TREE_OBJECTID, dev_root);
0b86a832
CM		 1917 if (ret)
1918 goto fail_extent_root;
5d4f98a2 1919 dev_root->track_dirty = 1;
3768f368 1920
d20f7043
CM		 1921 ret = find_and_setup_root(tree_root, fs_info,
1922 BTRFS_CSUM_TREE_OBJECTID, csum_root);
1923 if (ret)
5d4f98a2 1924 goto fail_dev_root;
d20f7043
CM		 1925
1926 csum_root->track_dirty = 1;
1927
8929ecfa
YZ		 1928 fs_info->generation = generation;
1929 fs_info->last_trans_committed = generation;
1930 fs_info->data_alloc_profile = (u64)-1;
1931 fs_info->metadata_alloc_profile = (u64)-1;
1932 fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
1933
1b1d1f66
JB		 1934 ret = btrfs_read_block_groups(extent_root);
1935 if (ret) {
1936 printk(KERN_ERR "Failed to read block groups: %d\n", ret);
1937 goto fail_block_groups;
1938 }
9078a3e1 1939
a74a4b97
CM		 1940 fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root,
1941 "btrfs-cleaner");
57506d50 1942 if (IS_ERR(fs_info->cleaner_kthread))
1b1d1f66 1943 goto fail_block_groups;
a74a4b97
CM		 1944
1945 fs_info->transaction_kthread = kthread_run(transaction_kthread,
1946 tree_root,
1947 "btrfs-transaction");
57506d50 1948 if (IS_ERR(fs_info->transaction_kthread))
3f157a2f 1949 goto fail_cleaner;
a74a4b97 1950
c289811c
CM		 1951 if (!btrfs_test_opt(tree_root, SSD) &&
1952 !btrfs_test_opt(tree_root, NOSSD) &&
1953 !fs_info->fs_devices->rotating) {
1954 printk(KERN_INFO "Btrfs detected SSD devices, enabling SSD "
1955 "mode\n");
1956 btrfs_set_opt(fs_info->mount_opt, SSD);
1957 }
1958
e02119d5 1959 if (btrfs_super_log_root(disk_super) != 0) {
e02119d5
CM		 1960 u64 bytenr = btrfs_super_log_root(disk_super);
1961
7c2ca468 1962 if (fs_devices->rw_devices == 0) {
d397712b
CM		 1963 printk(KERN_WARNING "Btrfs log replay required "
1964 "on RO media\n");
7c2ca468
CM		 1965 err = -EIO;
1966 goto fail_trans_kthread;
1967 }
e02119d5
CM		 1968 blocksize =
1969 btrfs_level_size(tree_root,
1970 btrfs_super_log_root_level(disk_super));
d18a2c44 1971
676e4c86
DC		 1972 log_tree_root = kzalloc(sizeof(struct btrfs_root), GFP_NOFS);
1973 if (!log_tree_root) {
1974 err = -ENOMEM;
1975 goto fail_trans_kthread;
1976 }
e02119d5
CM		 1977
1978 __setup_root(nodesize, leafsize, sectorsize, stripesize,
1979 log_tree_root, fs_info, BTRFS_TREE_LOG_OBJECTID);
1980
1981 log_tree_root->node = read_tree_block(tree_root, bytenr,
84234f3a
YZ		 1982 blocksize,
1983 generation + 1);
e02119d5
CM		 1984 ret = btrfs_recover_log_trees(log_tree_root);
1985 BUG_ON(ret);
e556ce2c
YZ		 1986
1987 if (sb->s_flags & MS_RDONLY) {
1988 ret = btrfs_commit_super(tree_root);
1989 BUG_ON(ret);
1990 }
e02119d5 1991 }
1a40e23b 1992
76dda93c
YZ		 1993 ret = btrfs_find_orphan_roots(tree_root);
1994 BUG_ON(ret);
1995
7c2ca468 1996 if (!(sb->s_flags & MS_RDONLY)) {
d68fc57b
YZ		 1997 ret = btrfs_cleanup_fs_roots(fs_info);
1998 BUG_ON(ret);
1999
5d4f98a2 2000 ret = btrfs_recover_relocation(tree_root);
d7ce5843
MX		 2001 if (ret < 0) {
2002 printk(KERN_WARNING
2003 "btrfs: failed to recover relocation\n");
2004 err = -EINVAL;
2005 goto fail_trans_kthread;
2006 }
7c2ca468 2007 }
1a40e23b 2008
3de4586c
CM		 2009 location.objectid = BTRFS_FS_TREE_OBJECTID;
2010 location.type = BTRFS_ROOT_ITEM_KEY;
2011 location.offset = (u64)-1;
2012
3de4586c
CM		 2013 fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location);
2014 if (!fs_info->fs_root)
7c2ca468 2015 goto fail_trans_kthread;
3140c9a3
DC		 2016 if (IS_ERR(fs_info->fs_root)) {
2017 err = PTR_ERR(fs_info->fs_root);
2018 goto fail_trans_kthread;
2019 }
c289811c 2020
e3acc2a6
JB		 2021 if (!(sb->s_flags & MS_RDONLY)) {
2022 down_read(&fs_info->cleanup_work_sem);
2023 btrfs_orphan_cleanup(fs_info->fs_root);
0af3d00b 2024 btrfs_orphan_cleanup(fs_info->tree_root);
e3acc2a6
JB		 2025 up_read(&fs_info->cleanup_work_sem);
2026 }
2027
0f7d52f4 2028 return tree_root;
39279cc3 2029
7c2ca468
CM		 2030fail_trans_kthread:
2031 kthread_stop(fs_info->transaction_kthread);
3f157a2f 2032fail_cleaner:
a74a4b97 2033 kthread_stop(fs_info->cleaner_kthread);
7c2ca468
CM		 2034
2035 /*
2036 * make sure we're done with the btree inode before we stop our
2037 * kthreads
2038 */
2039 filemap_write_and_wait(fs_info->btree_inode->i_mapping);
2040 invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
2041
1b1d1f66
JB		 2042fail_block_groups:
2043 btrfs_free_block_groups(fs_info);
d20f7043 2044 free_extent_buffer(csum_root->node);
5d4f98a2
YZ		 2045 free_extent_buffer(csum_root->commit_root);
2046fail_dev_root:
2047 free_extent_buffer(dev_root->node);
2048 free_extent_buffer(dev_root->commit_root);
0b86a832
CM		 2049fail_extent_root:
2050 free_extent_buffer(extent_root->node);
5d4f98a2 2051 free_extent_buffer(extent_root->commit_root);
39279cc3 2052fail_tree_root:
5f39d397 2053 free_extent_buffer(tree_root->node);
5d4f98a2 2054 free_extent_buffer(tree_root->commit_root);
2b82032c
YZ		 2055fail_chunk_root:
2056 free_extent_buffer(chunk_root->node);
5d4f98a2 2057 free_extent_buffer(chunk_root->commit_root);
39279cc3 2058fail_sb_buffer:
61d92c32 2059 btrfs_stop_workers(&fs_info->generic_worker);
247e743c 2060 btrfs_stop_workers(&fs_info->fixup_workers);
771ed689 2061 btrfs_stop_workers(&fs_info->delalloc_workers);
8b712842
CM		 2062 btrfs_stop_workers(&fs_info->workers);
2063 btrfs_stop_workers(&fs_info->endio_workers);
d20f7043 2064 btrfs_stop_workers(&fs_info->endio_meta_workers);
cad321ad 2065 btrfs_stop_workers(&fs_info->endio_meta_write_workers);
e6dcd2dc 2066 btrfs_stop_workers(&fs_info->endio_write_workers);
0cb59c99 2067 btrfs_stop_workers(&fs_info->endio_freespace_worker);
1cc127b5 2068 btrfs_stop_workers(&fs_info->submit_workers);
4543df7e 2069fail_iput:
7c2ca468 2070 invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
4543df7e 2071 iput(fs_info->btree_inode);
7e662854 2072
dfe25020 2073 btrfs_close_devices(fs_info->fs_devices);
84eed90f 2074 btrfs_mapping_tree_free(&fs_info->mapping_tree);
ad081f14 2075fail_bdi:
7e662854 2076 bdi_destroy(&fs_info->bdi);
76dda93c
YZ		 2077fail_srcu:
2078 cleanup_srcu_struct(&fs_info->subvol_srcu);
7e662854 2079fail:
39279cc3
CM		 2080 kfree(extent_root);
2081 kfree(tree_root);
2082 kfree(fs_info);
83afeac4
JM		 2083 kfree(chunk_root);
2084 kfree(dev_root);
d20f7043 2085 kfree(csum_root);
39279cc3 2086 return ERR_PTR(err);
eb60ceac
CM		 2087}
2088
f2984462
CM		 2089static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate)
2090{
2091 char b[BDEVNAME_SIZE];
2092
2093 if (uptodate) {
2094 set_buffer_uptodate(bh);
2095 } else {
2096 if (!buffer_eopnotsupp(bh) && printk_ratelimit()) {
2097 printk(KERN_WARNING "lost page write due to "
2098 "I/O error on %s\n",
2099 bdevname(bh->b_bdev, b));
2100 }
1259ab75
CM		 2101 /* note, we dont' set_buffer_write_io_error because we have
2102 * our own ways of dealing with the IO errors
2103 */
f2984462
CM		 2104 clear_buffer_uptodate(bh);
2105 }
2106 unlock_buffer(bh);
2107 put_bh(bh);
2108}
2109
a512bbf8
YZ		 2110struct buffer_head *btrfs_read_dev_super(struct block_device *bdev)
2111{
2112 struct buffer_head *bh;
2113 struct buffer_head *latest = NULL;
2114 struct btrfs_super_block *super;
2115 int i;
2116 u64 transid = 0;
2117 u64 bytenr;
2118
2119 /* we would like to check all the supers, but that would make
2120 * a btrfs mount succeed after a mkfs from a different FS.
2121 * So, we need to add a special mount option to scan for
2122 * later supers, using BTRFS_SUPER_MIRROR_MAX instead
2123 */
2124 for (i = 0; i < 1; i++) {
2125 bytenr = btrfs_sb_offset(i);
2126 if (bytenr + 4096 >= i_size_read(bdev->bd_inode))
2127 break;
2128 bh = __bread(bdev, bytenr / 4096, 4096);
2129 if (!bh)
2130 continue;
2131
2132 super = (struct btrfs_super_block *)bh->b_data;
2133 if (btrfs_super_bytenr(super) != bytenr ||
2134 strncmp((char *)(&super->magic), BTRFS_MAGIC,
2135 sizeof(super->magic))) {
2136 brelse(bh);
2137 continue;
2138 }
2139
2140 if (!latest || btrfs_super_generation(super) > transid) {
2141 brelse(latest);
2142 latest = bh;
2143 transid = btrfs_super_generation(super);
2144 } else {
2145 brelse(bh);
2146 }
2147 }
2148 return latest;
2149}
2150
4eedeb75
HH		 2151/*
2152 * this should be called twice, once with wait == 0 and
2153 * once with wait == 1. When wait == 0 is done, all the buffer heads
2154 * we write are pinned.
2155 *
2156 * They are released when wait == 1 is done.
2157 * max_mirrors must be the same for both runs, and it indicates how
2158 * many supers on this one device should be written.
2159 *
2160 * max_mirrors == 0 means to write them all.
2161 */
a512bbf8
YZ		 2162static int write_dev_supers(struct btrfs_device *device,
2163 struct btrfs_super_block *sb,
2164 int do_barriers, int wait, int max_mirrors)
2165{
2166 struct buffer_head *bh;
2167 int i;
2168 int ret;
2169 int errors = 0;
2170 u32 crc;
2171 u64 bytenr;
2172 int last_barrier = 0;
2173
2174 if (max_mirrors == 0)
2175 max_mirrors = BTRFS_SUPER_MIRROR_MAX;
2176
2177 /* make sure only the last submit_bh does a barrier */
2178 if (do_barriers) {
2179 for (i = 0; i < max_mirrors; i++) {
2180 bytenr = btrfs_sb_offset(i);
2181 if (bytenr + BTRFS_SUPER_INFO_SIZE >=
2182 device->total_bytes)
2183 break;
2184 last_barrier = i;
2185 }
2186 }
2187
2188 for (i = 0; i < max_mirrors; i++) {
2189 bytenr = btrfs_sb_offset(i);
2190 if (bytenr + BTRFS_SUPER_INFO_SIZE >= device->total_bytes)
2191 break;
2192
2193 if (wait) {
2194 bh = __find_get_block(device->bdev, bytenr / 4096,
2195 BTRFS_SUPER_INFO_SIZE);
2196 BUG_ON(!bh);
a512bbf8 2197 wait_on_buffer(bh);
4eedeb75
HH		 2198 if (!buffer_uptodate(bh))
2199 errors++;
2200
2201 /* drop our reference */
2202 brelse(bh);
2203
2204 /* drop the reference from the wait == 0 run */
2205 brelse(bh);
2206 continue;
a512bbf8
YZ		 2207 } else {
2208 btrfs_set_super_bytenr(sb, bytenr);
2209
2210 crc = ~(u32)0;
2211 crc = btrfs_csum_data(NULL, (char *)sb +
2212 BTRFS_CSUM_SIZE, crc,
2213 BTRFS_SUPER_INFO_SIZE -
2214 BTRFS_CSUM_SIZE);
2215 btrfs_csum_final(crc, sb->csum);
2216
4eedeb75
HH		 2217 /*
2218 * one reference for us, and we leave it for the
2219 * caller
2220 */
a512bbf8
YZ		 2221 bh = __getblk(device->bdev, bytenr / 4096,
2222 BTRFS_SUPER_INFO_SIZE);
2223 memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE);
2224
4eedeb75 2225 /* one reference for submit_bh */
a512bbf8 2226 get_bh(bh);
4eedeb75
HH		 2227
2228 set_buffer_uptodate(bh);
a512bbf8
YZ		 2229 lock_buffer(bh);
2230 bh->b_end_io = btrfs_end_buffer_write_sync;
2231 }
2232
2233 if (i == last_barrier && do_barriers && device->barriers) {
2234 ret = submit_bh(WRITE_BARRIER, bh);
2235 if (ret == -EOPNOTSUPP) {
2236 printk("btrfs: disabling barriers on dev %s\n",
2237 device->name);
2238 set_buffer_uptodate(bh);
2239 device->barriers = 0;
4eedeb75 2240 /* one reference for submit_bh */
a512bbf8
YZ		 2241 get_bh(bh);
2242 lock_buffer(bh);
ffbd517d 2243 ret = submit_bh(WRITE_SYNC, bh);
a512bbf8
YZ		 2244 }
2245 } else {
ffbd517d 2246 ret = submit_bh(WRITE_SYNC, bh);
a512bbf8
YZ		 2247 }
2248
4eedeb75 2249 if (ret)
a512bbf8 2250 errors++;
a512bbf8
YZ		 2251 }
2252 return errors < i ? 0 : -1;
2253}
2254
2255int write_all_supers(struct btrfs_root *root, int max_mirrors)
f2984462 2256{
e5e9a520 2257 struct list_head *head;
f2984462 2258 struct btrfs_device *dev;
a061fc8d 2259 struct btrfs_super_block *sb;
f2984462 2260 struct btrfs_dev_item *dev_item;
f2984462
CM		 2261 int ret;
2262 int do_barriers;
a236aed1
CM		 2263 int max_errors;
2264 int total_errors = 0;
a061fc8d 2265 u64 flags;
f2984462 2266
a236aed1 2267 max_errors = btrfs_super_num_devices(&root->fs_info->super_copy) - 1;
f2984462
CM		 2268 do_barriers = !btrfs_test_opt(root, NOBARRIER);
2269
a061fc8d
CM		 2270 sb = &root->fs_info->super_for_commit;
2271 dev_item = &sb->dev_item;
e5e9a520
CM		 2272
2273 mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
2274 head = &root->fs_info->fs_devices->devices;
c6e30871 2275 list_for_each_entry(dev, head, dev_list) {
dfe25020
CM		 2276 if (!dev->bdev) {
2277 total_errors++;
2278 continue;
2279 }
2b82032c 2280 if (!dev->in_fs_metadata || !dev->writeable)
dfe25020
CM		 2281 continue;
2282
2b82032c 2283 btrfs_set_stack_device_generation(dev_item, 0);
a061fc8d
CM		 2284 btrfs_set_stack_device_type(dev_item, dev->type);
2285 btrfs_set_stack_device_id(dev_item, dev->devid);
2286 btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes);
2287 btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used);
2288 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
2289 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
2290 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
2291 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
2b82032c 2292 memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
a512bbf8 2293
a061fc8d
CM		 2294 flags = btrfs_super_flags(sb);
2295 btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
2296
a512bbf8 2297 ret = write_dev_supers(dev, sb, do_barriers, 0, max_mirrors);
a236aed1
CM		 2298 if (ret)
2299 total_errors++;
f2984462 2300 }
a236aed1 2301 if (total_errors > max_errors) {
d397712b
CM		 2302 printk(KERN_ERR "btrfs: %d errors while writing supers\n",
2303 total_errors);
a236aed1
CM		 2304 BUG();
2305 }
f2984462 2306
a512bbf8 2307 total_errors = 0;
c6e30871 2308 list_for_each_entry(dev, head, dev_list) {
dfe25020
CM		 2309 if (!dev->bdev)
2310 continue;
2b82032c 2311 if (!dev->in_fs_metadata || !dev->writeable)
dfe25020
CM		 2312 continue;
2313
a512bbf8
YZ		 2314 ret = write_dev_supers(dev, sb, do_barriers, 1, max_mirrors);
2315 if (ret)
2316 total_errors++;
f2984462 2317 }
e5e9a520 2318 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
a236aed1 2319 if (total_errors > max_errors) {
d397712b
CM		 2320 printk(KERN_ERR "btrfs: %d errors while writing supers\n",
2321 total_errors);
a236aed1
CM		 2322 BUG();
2323 }
f2984462
CM		 2324 return 0;
2325}
2326
a512bbf8
YZ		 2327int write_ctree_super(struct btrfs_trans_handle *trans,
2328 struct btrfs_root *root, int max_mirrors)
eb60ceac 2329{
e66f709b 2330 int ret;
5f39d397 2331
a512bbf8 2332 ret = write_all_supers(root, max_mirrors);
5f39d397 2333 return ret;
cfaa7295
CM		 2334}
2335
5eda7b5e 2336int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
2619ba1f 2337{
4df27c4d 2338 spin_lock(&fs_info->fs_roots_radix_lock);
2619ba1f
CM		 2339 radix_tree_delete(&fs_info->fs_roots_radix,
2340 (unsigned long)root->root_key.objectid);
4df27c4d 2341 spin_unlock(&fs_info->fs_roots_radix_lock);
76dda93c
YZ		 2342
2343 if (btrfs_root_refs(&root->root_item) == 0)
2344 synchronize_srcu(&fs_info->subvol_srcu);
2345
4df27c4d
YZ		 2346 free_fs_root(root);
2347 return 0;
2348}
2349
2350static void free_fs_root(struct btrfs_root *root)
2351{
2352 WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree));
3394e160
CM		 2353 if (root->anon_super.s_dev) {
2354 down_write(&root->anon_super.s_umount);
2355 kill_anon_super(&root->anon_super);
2356 }
4df27c4d
YZ		 2357 free_extent_buffer(root->node);
2358 free_extent_buffer(root->commit_root);
d397712b 2359 kfree(root->name);
2619ba1f 2360 kfree(root);
2619ba1f
CM		 2361}
2362
35b7e476 2363static int del_fs_roots(struct btrfs_fs_info *fs_info)
0f7d52f4
CM		 2364{
2365 int ret;
2366 struct btrfs_root *gang[8];
2367 int i;
2368
76dda93c
YZ		 2369 while (!list_empty(&fs_info->dead_roots)) {
2370 gang[0] = list_entry(fs_info->dead_roots.next,
2371 struct btrfs_root, root_list);
2372 list_del(&gang[0]->root_list);
2373
2374 if (gang[0]->in_radix) {
2375 btrfs_free_fs_root(fs_info, gang[0]);
2376 } else {
2377 free_extent_buffer(gang[0]->node);
2378 free_extent_buffer(gang[0]->commit_root);
2379 kfree(gang[0]);
2380 }
2381 }
2382
d397712b 2383 while (1) {
0f7d52f4
CM		 2384 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
2385 (void **)gang, 0,
2386 ARRAY_SIZE(gang));
2387 if (!ret)
2388 break;
2619ba1f 2389 for (i = 0; i < ret; i++)
5eda7b5e 2390 btrfs_free_fs_root(fs_info, gang[i]);
0f7d52f4
CM		 2391 }
2392 return 0;
2393}
b4100d64 2394
c146afad 2395int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info)
cfaa7295 2396{
c146afad
YZ		 2397 u64 root_objectid = 0;
2398 struct btrfs_root *gang[8];
2399 int i;
3768f368 2400 int ret;
e089f05c 2401
c146afad
YZ		 2402 while (1) {
2403 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
2404 (void **)gang, root_objectid,
2405 ARRAY_SIZE(gang));
2406 if (!ret)
2407 break;
5d4f98a2
YZ		 2408
2409 root_objectid = gang[ret - 1]->root_key.objectid + 1;
c146afad
YZ		 2410 for (i = 0; i < ret; i++) {
2411 root_objectid = gang[i]->root_key.objectid;
c146afad
YZ		 2412 btrfs_orphan_cleanup(gang[i]);
2413 }
2414 root_objectid++;
2415 }
2416 return 0;
2417}
a2135011 2418
c146afad
YZ		 2419int btrfs_commit_super(struct btrfs_root *root)
2420{
2421 struct btrfs_trans_handle *trans;
2422 int ret;
a74a4b97 2423
c146afad 2424 mutex_lock(&root->fs_info->cleaner_mutex);
24bbcf04 2425 btrfs_run_delayed_iputs(root);
a74a4b97 2426 btrfs_clean_old_snapshots(root);
c146afad 2427 mutex_unlock(&root->fs_info->cleaner_mutex);
c71bf099
YZ		 2428
2429 /* wait until ongoing cleanup work done */
2430 down_write(&root->fs_info->cleanup_work_sem);
2431 up_write(&root->fs_info->cleanup_work_sem);
2432
a22285a6 2433 trans = btrfs_join_transaction(root, 1);
54aa1f4d 2434 ret = btrfs_commit_transaction(trans, root);
c146afad
YZ		 2435 BUG_ON(ret);
2436 /* run commit again to drop the original snapshot */
a22285a6 2437 trans = btrfs_join_transaction(root, 1);
79154b1b
CM		 2438 btrfs_commit_transaction(trans, root);
2439 ret = btrfs_write_and_wait_transaction(NULL, root);
3768f368 2440 BUG_ON(ret);
d6bfde87 2441
a512bbf8 2442 ret = write_ctree_super(NULL, root, 0);
c146afad
YZ		 2443 return ret;
2444}
2445
2446int close_ctree(struct btrfs_root *root)
2447{
2448 struct btrfs_fs_info *fs_info = root->fs_info;
2449 int ret;
2450
2451 fs_info->closing = 1;
2452 smp_mb();
2453
0af3d00b 2454 btrfs_put_block_group_cache(fs_info);
c146afad
YZ		 2455 if (!(fs_info->sb->s_flags & MS_RDONLY)) {
2456 ret = btrfs_commit_super(root);
d397712b
CM		 2457 if (ret)
2458 printk(KERN_ERR "btrfs: commit super ret %d\n", ret);
c146afad 2459 }
0f7d52f4 2460
8929ecfa
YZ		 2461 kthread_stop(root->fs_info->transaction_kthread);
2462 kthread_stop(root->fs_info->cleaner_kthread);
2463
f25784b3
YZ		 2464 fs_info->closing = 2;
2465 smp_mb();
2466
b0c68f8b 2467 if (fs_info->delalloc_bytes) {
d397712b 2468 printk(KERN_INFO "btrfs: at unmount delalloc count %llu\n",
21380931 2469 (unsigned long long)fs_info->delalloc_bytes);
b0c68f8b 2470 }
31153d81 2471 if (fs_info->total_ref_cache_size) {
d397712b
CM		 2472 printk(KERN_INFO "btrfs: at umount reference cache size %llu\n",
2473 (unsigned long long)fs_info->total_ref_cache_size);
31153d81 2474 }
bcc63abb 2475
5d4f98a2
YZ		 2476 free_extent_buffer(fs_info->extent_root->node);
2477 free_extent_buffer(fs_info->extent_root->commit_root);
2478 free_extent_buffer(fs_info->tree_root->node);
2479 free_extent_buffer(fs_info->tree_root->commit_root);
2480 free_extent_buffer(root->fs_info->chunk_root->node);
2481 free_extent_buffer(root->fs_info->chunk_root->commit_root);
2482 free_extent_buffer(root->fs_info->dev_root->node);
2483 free_extent_buffer(root->fs_info->dev_root->commit_root);
2484 free_extent_buffer(root->fs_info->csum_root->node);
2485 free_extent_buffer(root->fs_info->csum_root->commit_root);
d20f7043 2486
9078a3e1 2487 btrfs_free_block_groups(root->fs_info);
d10c5f31 2488
c146afad 2489 del_fs_roots(fs_info);
d10c5f31 2490
c146afad 2491 iput(fs_info->btree_inode);
9ad6b7bc 2492
61d92c32 2493 btrfs_stop_workers(&fs_info->generic_worker);
247e743c 2494 btrfs_stop_workers(&fs_info->fixup_workers);
771ed689 2495 btrfs_stop_workers(&fs_info->delalloc_workers);
8b712842
CM		 2496 btrfs_stop_workers(&fs_info->workers);
2497 btrfs_stop_workers(&fs_info->endio_workers);
d20f7043 2498 btrfs_stop_workers(&fs_info->endio_meta_workers);
cad321ad 2499 btrfs_stop_workers(&fs_info->endio_meta_write_workers);
e6dcd2dc 2500 btrfs_stop_workers(&fs_info->endio_write_workers);
0cb59c99 2501 btrfs_stop_workers(&fs_info->endio_freespace_worker);
1cc127b5 2502 btrfs_stop_workers(&fs_info->submit_workers);
d6bfde87 2503
dfe25020 2504 btrfs_close_devices(fs_info->fs_devices);
0b86a832 2505 btrfs_mapping_tree_free(&fs_info->mapping_tree);
b248a415 2506
04160088 2507 bdi_destroy(&fs_info->bdi);
76dda93c 2508 cleanup_srcu_struct(&fs_info->subvol_srcu);
0b86a832 2509
0f7d52f4 2510 kfree(fs_info->extent_root);
0f7d52f4 2511 kfree(fs_info->tree_root);
0b86a832
CM		 2512 kfree(fs_info->chunk_root);
2513 kfree(fs_info->dev_root);
d20f7043 2514 kfree(fs_info->csum_root);
eb60ceac
CM		 2515 return 0;
2516}
2517
1259ab75 2518int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
5f39d397 2519{
1259ab75 2520 int ret;
810191ff 2521 struct inode *btree_inode = buf->first_page->mapping->host;
1259ab75 2522
2ac55d41
JB		 2523 ret = extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, buf,
2524 NULL);
1259ab75
CM		 2525 if (!ret)
2526 return ret;
2527
2528 ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf,
2529 parent_transid);
2530 return !ret;
5f39d397
CM		 2531}
2532
2533int btrfs_set_buffer_uptodate(struct extent_buffer *buf)
ccd467d6 2534{
810191ff 2535 struct inode *btree_inode = buf->first_page->mapping->host;
d1310b2e 2536 return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree,
5f39d397
CM		 2537 buf);
2538}
6702ed49 2539
5f39d397
CM		 2540void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
2541{
810191ff 2542 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
5f39d397
CM		 2543 u64 transid = btrfs_header_generation(buf);
2544 struct inode *btree_inode = root->fs_info->btree_inode;
b9473439 2545 int was_dirty;
b4ce94de 2546
b9447ef8 2547 btrfs_assert_tree_locked(buf);
ccd467d6 2548 if (transid != root->fs_info->generation) {
d397712b
CM		 2549 printk(KERN_CRIT "btrfs transid mismatch buffer %llu, "
2550 "found %llu running %llu\n",
db94535d 2551 (unsigned long long)buf->start,
d397712b
CM		 2552 (unsigned long long)transid,
2553 (unsigned long long)root->fs_info->generation);
ccd467d6
CM		 2554 WARN_ON(1);
2555 }
b9473439
CM		 2556 was_dirty = set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree,
2557 buf);
2558 if (!was_dirty) {
2559 spin_lock(&root->fs_info->delalloc_lock);
2560 root->fs_info->dirty_metadata_bytes += buf->len;
2561 spin_unlock(&root->fs_info->delalloc_lock);
2562 }
eb60ceac
CM		 2563}
2564
d3c2fdcf 2565void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
35b7e476 2566{
188de649
CM		 2567 /*
2568 * looks as though older kernels can get into trouble with
2569 * this code, they end up stuck in balance_dirty_pages forever
2570 */
d6bfde87 2571 u64 num_dirty;
771ed689 2572 unsigned long thresh = 32 * 1024 * 1024;
d6bfde87 2573
6933c02e 2574 if (current->flags & PF_MEMALLOC)
d6bfde87
CM		 2575 return;
2576
585ad2c3
CM		 2577 num_dirty = root->fs_info->dirty_metadata_bytes;
2578
d6bfde87
CM		 2579 if (num_dirty > thresh) {
2580 balance_dirty_pages_ratelimited_nr(
d7fc640e 2581 root->fs_info->btree_inode->i_mapping, 1);
d6bfde87 2582 }
188de649 2583 return;
35b7e476 2584}
6b80053d 2585
ca7a79ad 2586int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid)
6b80053d 2587{
810191ff 2588 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
ce9adaa5 2589 int ret;
ca7a79ad 2590 ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid);
d397712b 2591 if (ret == 0)
b4ce94de 2592 set_bit(EXTENT_BUFFER_UPTODATE, &buf->bflags);
ce9adaa5 2593 return ret;
6b80053d 2594}
0da5468f 2595
4bef0848
CM		 2596int btree_lock_page_hook(struct page *page)
2597{
2598 struct inode *inode = page->mapping->host;
b9473439 2599 struct btrfs_root *root = BTRFS_I(inode)->root;
4bef0848
CM		 2600 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
2601 struct extent_buffer *eb;
2602 unsigned long len;
2603 u64 bytenr = page_offset(page);
2604
2605 if (page->private == EXTENT_PAGE_PRIVATE)
2606 goto out;
2607
2608 len = page->private >> 2;
2609 eb = find_extent_buffer(io_tree, bytenr, len, GFP_NOFS);
2610 if (!eb)
2611 goto out;
2612
2613 btrfs_tree_lock(eb);
4bef0848 2614 btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
b9473439
CM		 2615
2616 if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) {
2617 spin_lock(&root->fs_info->delalloc_lock);
2618 if (root->fs_info->dirty_metadata_bytes >= eb->len)
2619 root->fs_info->dirty_metadata_bytes -= eb->len;
2620 else
2621 WARN_ON(1);
2622 spin_unlock(&root->fs_info->delalloc_lock);
2623 }
2624
4bef0848
CM		 2625 btrfs_tree_unlock(eb);
2626 free_extent_buffer(eb);
2627out:
2628 lock_page(page);
2629 return 0;
2630}
2631
d1310b2e 2632static struct extent_io_ops btree_extent_io_ops = {
4bef0848 2633 .write_cache_pages_lock_hook = btree_lock_page_hook,
ce9adaa5 2634 .readpage_end_io_hook = btree_readpage_end_io_hook,
0b86a832 2635 .submit_bio_hook = btree_submit_bio_hook,
239b14b3
CM		 2636 /* note we're sharing with inode.c for the merge bio hook */
2637 .merge_bio_hook = btrfs_merge_bio_hook,
0da5468f 2638};
Linux 6.x block layer and io_uring tree(s)