1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2007 Oracle. All rights reserved.
7 #include <linux/blkdev.h>
8 #include <linux/radix-tree.h>
9 #include <linux/writeback.h>
10 #include <linux/workqueue.h>
11 #include <linux/kthread.h>
12 #include <linux/slab.h>
13 #include <linux/migrate.h>
14 #include <linux/ratelimit.h>
15 #include <linux/uuid.h>
16 #include <linux/semaphore.h>
17 #include <linux/error-injection.h>
18 #include <linux/crc32c.h>
19 #include <linux/sched/mm.h>
20 #include <asm/unaligned.h>
21 #include <crypto/hash.h>
24 #include "transaction.h"
25 #include "btrfs_inode.h"
27 #include "print-tree.h"
30 #include "free-space-cache.h"
31 #include "free-space-tree.h"
32 #include "check-integrity.h"
33 #include "rcu-string.h"
34 #include "dev-replace.h"
38 #include "compression.h"
39 #include "tree-checker.h"
40 #include "ref-verify.h"
41 #include "block-group.h"
43 #include "space-info.h"
47 #define BTRFS_SUPER_FLAG_SUPP (BTRFS_HEADER_FLAG_WRITTEN |\
48 BTRFS_HEADER_FLAG_RELOC |\
49 BTRFS_SUPER_FLAG_ERROR |\
50 BTRFS_SUPER_FLAG_SEEDING |\
51 BTRFS_SUPER_FLAG_METADUMP |\
52 BTRFS_SUPER_FLAG_METADUMP_V2)
54 static void end_workqueue_fn(struct btrfs_work *work);
55 static void btrfs_destroy_ordered_extents(struct btrfs_root *root);
56 static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
57 struct btrfs_fs_info *fs_info);
58 static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root);
59 static int btrfs_destroy_marked_extents(struct btrfs_fs_info *fs_info,
60 struct extent_io_tree *dirty_pages,
62 static int btrfs_destroy_pinned_extent(struct btrfs_fs_info *fs_info,
63 struct extent_io_tree *pinned_extents);
64 static int btrfs_cleanup_transaction(struct btrfs_fs_info *fs_info);
65 static void btrfs_error_commit_super(struct btrfs_fs_info *fs_info);
68 * btrfs_end_io_wq structs are used to do processing in task context when an IO
69 * is complete. This is used during reads to verify checksums, and it is used
70 * by writes to insert metadata for new file extents after IO is complete.
72 struct btrfs_end_io_wq {
76 struct btrfs_fs_info *info;
78 enum btrfs_wq_endio_type metadata;
79 struct btrfs_work work;
82 static struct kmem_cache *btrfs_end_io_wq_cache;
84 int __init btrfs_end_io_wq_init(void)
86 btrfs_end_io_wq_cache = kmem_cache_create("btrfs_end_io_wq",
87 sizeof(struct btrfs_end_io_wq),
91 if (!btrfs_end_io_wq_cache)
96 void __cold btrfs_end_io_wq_exit(void)
98 kmem_cache_destroy(btrfs_end_io_wq_cache);
101 static void btrfs_free_csum_hash(struct btrfs_fs_info *fs_info)
103 if (fs_info->csum_shash)
104 crypto_free_shash(fs_info->csum_shash);
108 * async submit bios are used to offload expensive checksumming
109 * onto the worker threads. They checksum file and metadata bios
110 * just before they are sent down the IO stack.
112 struct async_submit_bio {
115 extent_submit_bio_start_t *submit_bio_start;
118 /* Optional parameter for submit_bio_start used by direct io */
120 struct btrfs_work work;
125 * Lockdep class keys for extent_buffer->lock's in this root. For a given
126 * eb, the lockdep key is determined by the btrfs_root it belongs to and
127 * the level the eb occupies in the tree.
129 * Different roots are used for different purposes and may nest inside each
130 * other and they require separate keysets. As lockdep keys should be
131 * static, assign keysets according to the purpose of the root as indicated
132 * by btrfs_root->root_key.objectid. This ensures that all special purpose
133 * roots have separate keysets.
135 * Lock-nesting across peer nodes is always done with the immediate parent
136 * node locked thus preventing deadlock. As lockdep doesn't know this, use
137 * subclass to avoid triggering lockdep warning in such cases.
139 * The key is set by the readpage_end_io_hook after the buffer has passed
140 * csum validation but before the pages are unlocked. It is also set by
141 * btrfs_init_new_buffer on freshly allocated blocks.
143 * We also add a check to make sure the highest level of the tree is the
144 * same as our lockdep setup here. If BTRFS_MAX_LEVEL changes, this code
145 * needs update as well.
147 #ifdef CONFIG_DEBUG_LOCK_ALLOC
148 # if BTRFS_MAX_LEVEL != 8
152 #define DEFINE_LEVEL(stem, level) \
153 .names[level] = "btrfs-" stem "-0" #level,
155 #define DEFINE_NAME(stem) \
156 DEFINE_LEVEL(stem, 0) \
157 DEFINE_LEVEL(stem, 1) \
158 DEFINE_LEVEL(stem, 2) \
159 DEFINE_LEVEL(stem, 3) \
160 DEFINE_LEVEL(stem, 4) \
161 DEFINE_LEVEL(stem, 5) \
162 DEFINE_LEVEL(stem, 6) \
163 DEFINE_LEVEL(stem, 7)
165 static struct btrfs_lockdep_keyset {
166 u64 id; /* root objectid */
167 /* Longest entry: btrfs-free-space-00 */
168 char names[BTRFS_MAX_LEVEL][20];
169 struct lock_class_key keys[BTRFS_MAX_LEVEL];
170 } btrfs_lockdep_keysets[] = {
171 { .id = BTRFS_ROOT_TREE_OBJECTID, DEFINE_NAME("root") },
172 { .id = BTRFS_EXTENT_TREE_OBJECTID, DEFINE_NAME("extent") },
173 { .id = BTRFS_CHUNK_TREE_OBJECTID, DEFINE_NAME("chunk") },
174 { .id = BTRFS_DEV_TREE_OBJECTID, DEFINE_NAME("dev") },
175 { .id = BTRFS_CSUM_TREE_OBJECTID, DEFINE_NAME("csum") },
176 { .id = BTRFS_QUOTA_TREE_OBJECTID, DEFINE_NAME("quota") },
177 { .id = BTRFS_TREE_LOG_OBJECTID, DEFINE_NAME("log") },
178 { .id = BTRFS_TREE_RELOC_OBJECTID, DEFINE_NAME("treloc") },
179 { .id = BTRFS_DATA_RELOC_TREE_OBJECTID, DEFINE_NAME("dreloc") },
180 { .id = BTRFS_UUID_TREE_OBJECTID, DEFINE_NAME("uuid") },
181 { .id = BTRFS_FREE_SPACE_TREE_OBJECTID, DEFINE_NAME("free-space") },
182 { .id = 0, DEFINE_NAME("tree") },
188 void btrfs_set_buffer_lockdep_class(u64 objectid, struct extent_buffer *eb,
191 struct btrfs_lockdep_keyset *ks;
193 BUG_ON(level >= ARRAY_SIZE(ks->keys));
195 /* find the matching keyset, id 0 is the default entry */
196 for (ks = btrfs_lockdep_keysets; ks->id; ks++)
197 if (ks->id == objectid)
200 lockdep_set_class_and_name(&eb->lock,
201 &ks->keys[level], ks->names[level]);
207 * Compute the csum of a btree block and store the result to provided buffer.
209 static void csum_tree_block(struct extent_buffer *buf, u8 *result)
211 struct btrfs_fs_info *fs_info = buf->fs_info;
212 const int num_pages = num_extent_pages(buf);
213 const int first_page_part = min_t(u32, PAGE_SIZE, fs_info->nodesize);
214 SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
218 shash->tfm = fs_info->csum_shash;
219 crypto_shash_init(shash);
220 kaddr = page_address(buf->pages[0]) + offset_in_page(buf->start);
221 crypto_shash_update(shash, kaddr + BTRFS_CSUM_SIZE,
222 first_page_part - BTRFS_CSUM_SIZE);
224 for (i = 1; i < num_pages; i++) {
225 kaddr = page_address(buf->pages[i]);
226 crypto_shash_update(shash, kaddr, PAGE_SIZE);
228 memset(result, 0, BTRFS_CSUM_SIZE);
229 crypto_shash_final(shash, result);
233 * we can't consider a given block up to date unless the transid of the
234 * block matches the transid in the parent node's pointer. This is how we
235 * detect blocks that either didn't get written at all or got written
236 * in the wrong place.
238 static int verify_parent_transid(struct extent_io_tree *io_tree,
239 struct extent_buffer *eb, u64 parent_transid,
242 struct extent_state *cached_state = NULL;
245 if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
251 lock_extent_bits(io_tree, eb->start, eb->start + eb->len - 1,
253 if (extent_buffer_uptodate(eb) &&
254 btrfs_header_generation(eb) == parent_transid) {
258 btrfs_err_rl(eb->fs_info,
259 "parent transid verify failed on %llu wanted %llu found %llu",
261 parent_transid, btrfs_header_generation(eb));
263 clear_extent_buffer_uptodate(eb);
265 unlock_extent_cached(io_tree, eb->start, eb->start + eb->len - 1,
270 static bool btrfs_supported_super_csum(u16 csum_type)
273 case BTRFS_CSUM_TYPE_CRC32:
274 case BTRFS_CSUM_TYPE_XXHASH:
275 case BTRFS_CSUM_TYPE_SHA256:
276 case BTRFS_CSUM_TYPE_BLAKE2:
284 * Return 0 if the superblock checksum type matches the checksum value of that
285 * algorithm. Pass the raw disk superblock data.
287 static int btrfs_check_super_csum(struct btrfs_fs_info *fs_info,
290 struct btrfs_super_block *disk_sb =
291 (struct btrfs_super_block *)raw_disk_sb;
292 char result[BTRFS_CSUM_SIZE];
293 SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
295 shash->tfm = fs_info->csum_shash;
298 * The super_block structure does not span the whole
299 * BTRFS_SUPER_INFO_SIZE range, we expect that the unused space is
300 * filled with zeros and is included in the checksum.
302 crypto_shash_digest(shash, raw_disk_sb + BTRFS_CSUM_SIZE,
303 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE, result);
305 if (memcmp(disk_sb->csum, result, fs_info->csum_size))
311 int btrfs_verify_level_key(struct extent_buffer *eb, int level,
312 struct btrfs_key *first_key, u64 parent_transid)
314 struct btrfs_fs_info *fs_info = eb->fs_info;
316 struct btrfs_key found_key;
319 found_level = btrfs_header_level(eb);
320 if (found_level != level) {
321 WARN(IS_ENABLED(CONFIG_BTRFS_DEBUG),
322 KERN_ERR "BTRFS: tree level check failed\n");
324 "tree level mismatch detected, bytenr=%llu level expected=%u has=%u",
325 eb->start, level, found_level);
333 * For live tree block (new tree blocks in current transaction),
334 * we need proper lock context to avoid race, which is impossible here.
335 * So we only checks tree blocks which is read from disk, whose
336 * generation <= fs_info->last_trans_committed.
338 if (btrfs_header_generation(eb) > fs_info->last_trans_committed)
341 /* We have @first_key, so this @eb must have at least one item */
342 if (btrfs_header_nritems(eb) == 0) {
344 "invalid tree nritems, bytenr=%llu nritems=0 expect >0",
346 WARN_ON(IS_ENABLED(CONFIG_BTRFS_DEBUG));
351 btrfs_node_key_to_cpu(eb, &found_key, 0);
353 btrfs_item_key_to_cpu(eb, &found_key, 0);
354 ret = btrfs_comp_cpu_keys(first_key, &found_key);
357 WARN(IS_ENABLED(CONFIG_BTRFS_DEBUG),
358 KERN_ERR "BTRFS: tree first key check failed\n");
360 "tree first key mismatch detected, bytenr=%llu parent_transid=%llu key expected=(%llu,%u,%llu) has=(%llu,%u,%llu)",
361 eb->start, parent_transid, first_key->objectid,
362 first_key->type, first_key->offset,
363 found_key.objectid, found_key.type,
370 * helper to read a given tree block, doing retries as required when
371 * the checksums don't match and we have alternate mirrors to try.
373 * @parent_transid: expected transid, skip check if 0
374 * @level: expected level, mandatory check
375 * @first_key: expected key of first slot, skip check if NULL
377 int btrfs_read_extent_buffer(struct extent_buffer *eb,
378 u64 parent_transid, int level,
379 struct btrfs_key *first_key)
381 struct btrfs_fs_info *fs_info = eb->fs_info;
382 struct extent_io_tree *io_tree;
387 int failed_mirror = 0;
389 io_tree = &BTRFS_I(fs_info->btree_inode)->io_tree;
391 clear_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags);
392 ret = read_extent_buffer_pages(eb, WAIT_COMPLETE, mirror_num);
394 if (verify_parent_transid(io_tree, eb,
397 else if (btrfs_verify_level_key(eb, level,
398 first_key, parent_transid))
404 num_copies = btrfs_num_copies(fs_info,
409 if (!failed_mirror) {
411 failed_mirror = eb->read_mirror;
415 if (mirror_num == failed_mirror)
418 if (mirror_num > num_copies)
422 if (failed && !ret && failed_mirror)
423 btrfs_repair_eb_io_failure(eb, failed_mirror);
428 static int csum_one_extent_buffer(struct extent_buffer *eb)
430 struct btrfs_fs_info *fs_info = eb->fs_info;
431 u8 result[BTRFS_CSUM_SIZE];
434 ASSERT(memcmp_extent_buffer(eb, fs_info->fs_devices->metadata_uuid,
435 offsetof(struct btrfs_header, fsid),
436 BTRFS_FSID_SIZE) == 0);
437 csum_tree_block(eb, result);
439 if (btrfs_header_level(eb))
440 ret = btrfs_check_node(eb);
442 ret = btrfs_check_leaf_full(eb);
448 * Also check the generation, the eb reached here must be newer than
449 * last committed. Or something seriously wrong happened.
451 if (unlikely(btrfs_header_generation(eb) <= fs_info->last_trans_committed)) {
454 "block=%llu bad generation, have %llu expect > %llu",
455 eb->start, btrfs_header_generation(eb),
456 fs_info->last_trans_committed);
459 write_extent_buffer(eb, result, 0, fs_info->csum_size);
464 btrfs_print_tree(eb, 0);
465 btrfs_err(fs_info, "block=%llu write time tree block corruption detected",
467 WARN_ON(IS_ENABLED(CONFIG_BTRFS_DEBUG));
471 /* Checksum all dirty extent buffers in one bio_vec */
472 static int csum_dirty_subpage_buffers(struct btrfs_fs_info *fs_info,
473 struct bio_vec *bvec)
475 struct page *page = bvec->bv_page;
476 u64 bvec_start = page_offset(page) + bvec->bv_offset;
480 for (cur = bvec_start; cur < bvec_start + bvec->bv_len;
481 cur += fs_info->nodesize) {
482 struct extent_buffer *eb;
485 eb = find_extent_buffer(fs_info, cur);
486 uptodate = btrfs_subpage_test_uptodate(fs_info, page, cur,
489 /* A dirty eb shouldn't disappear from extent_buffers */
493 if (WARN_ON(cur != btrfs_header_bytenr(eb))) {
494 free_extent_buffer(eb);
497 if (WARN_ON(!uptodate)) {
498 free_extent_buffer(eb);
502 ret = csum_one_extent_buffer(eb);
503 free_extent_buffer(eb);
511 * Checksum a dirty tree block before IO. This has extra checks to make sure
512 * we only fill in the checksum field in the first page of a multi-page block.
513 * For subpage extent buffers we need bvec to also read the offset in the page.
515 static int csum_dirty_buffer(struct btrfs_fs_info *fs_info, struct bio_vec *bvec)
517 struct page *page = bvec->bv_page;
518 u64 start = page_offset(page);
520 struct extent_buffer *eb;
522 if (fs_info->nodesize < PAGE_SIZE)
523 return csum_dirty_subpage_buffers(fs_info, bvec);
525 eb = (struct extent_buffer *)page->private;
526 if (page != eb->pages[0])
529 found_start = btrfs_header_bytenr(eb);
531 if (test_bit(EXTENT_BUFFER_NO_CHECK, &eb->bflags)) {
532 WARN_ON(found_start != 0);
537 * Please do not consolidate these warnings into a single if.
538 * It is useful to know what went wrong.
540 if (WARN_ON(found_start != start))
542 if (WARN_ON(!PageUptodate(page)))
545 return csum_one_extent_buffer(eb);
548 static int check_tree_block_fsid(struct extent_buffer *eb)
550 struct btrfs_fs_info *fs_info = eb->fs_info;
551 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices, *seed_devs;
552 u8 fsid[BTRFS_FSID_SIZE];
555 read_extent_buffer(eb, fsid, offsetof(struct btrfs_header, fsid),
558 * Checking the incompat flag is only valid for the current fs. For
559 * seed devices it's forbidden to have their uuid changed so reading
560 * ->fsid in this case is fine
562 if (btrfs_fs_incompat(fs_info, METADATA_UUID))
563 metadata_uuid = fs_devices->metadata_uuid;
565 metadata_uuid = fs_devices->fsid;
567 if (!memcmp(fsid, metadata_uuid, BTRFS_FSID_SIZE))
570 list_for_each_entry(seed_devs, &fs_devices->seed_list, seed_list)
571 if (!memcmp(fsid, seed_devs->fsid, BTRFS_FSID_SIZE))
577 /* Do basic extent buffer checks at read time */
578 static int validate_extent_buffer(struct extent_buffer *eb)
580 struct btrfs_fs_info *fs_info = eb->fs_info;
582 const u32 csum_size = fs_info->csum_size;
584 u8 result[BTRFS_CSUM_SIZE];
585 const u8 *header_csum;
588 found_start = btrfs_header_bytenr(eb);
589 if (found_start != eb->start) {
590 btrfs_err_rl(fs_info, "bad tree block start, want %llu have %llu",
591 eb->start, found_start);
595 if (check_tree_block_fsid(eb)) {
596 btrfs_err_rl(fs_info, "bad fsid on block %llu",
601 found_level = btrfs_header_level(eb);
602 if (found_level >= BTRFS_MAX_LEVEL) {
603 btrfs_err(fs_info, "bad tree block level %d on %llu",
604 (int)btrfs_header_level(eb), eb->start);
609 csum_tree_block(eb, result);
610 header_csum = page_address(eb->pages[0]) +
611 get_eb_offset_in_page(eb, offsetof(struct btrfs_header, csum));
613 if (memcmp(result, header_csum, csum_size) != 0) {
614 btrfs_warn_rl(fs_info,
615 "checksum verify failed on %llu wanted " CSUM_FMT " found " CSUM_FMT " level %d",
617 CSUM_FMT_VALUE(csum_size, header_csum),
618 CSUM_FMT_VALUE(csum_size, result),
619 btrfs_header_level(eb));
625 * If this is a leaf block and it is corrupt, set the corrupt bit so
626 * that we don't try and read the other copies of this block, just
629 if (found_level == 0 && btrfs_check_leaf_full(eb)) {
630 set_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags);
634 if (found_level > 0 && btrfs_check_node(eb))
638 set_extent_buffer_uptodate(eb);
641 "block=%llu read time tree block corruption detected",
647 static int validate_subpage_buffer(struct page *page, u64 start, u64 end,
650 struct btrfs_fs_info *fs_info = btrfs_sb(page->mapping->host->i_sb);
651 struct extent_buffer *eb;
656 * We don't allow bio merge for subpage metadata read, so we should
657 * only get one eb for each endio hook.
659 ASSERT(end == start + fs_info->nodesize - 1);
660 ASSERT(PagePrivate(page));
662 eb = find_extent_buffer(fs_info, start);
664 * When we are reading one tree block, eb must have been inserted into
665 * the radix tree. If not, something is wrong.
669 reads_done = atomic_dec_and_test(&eb->io_pages);
670 /* Subpage read must finish in page read */
673 eb->read_mirror = mirror;
674 if (test_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags)) {
678 ret = validate_extent_buffer(eb);
682 set_extent_buffer_uptodate(eb);
684 free_extent_buffer(eb);
688 * end_bio_extent_readpage decrements io_pages in case of error,
689 * make sure it has something to decrement.
691 atomic_inc(&eb->io_pages);
692 clear_extent_buffer_uptodate(eb);
693 free_extent_buffer(eb);
697 int btrfs_validate_metadata_buffer(struct btrfs_bio *bbio,
698 struct page *page, u64 start, u64 end,
701 struct extent_buffer *eb;
705 ASSERT(page->private);
707 if (btrfs_sb(page->mapping->host->i_sb)->nodesize < PAGE_SIZE)
708 return validate_subpage_buffer(page, start, end, mirror);
710 eb = (struct extent_buffer *)page->private;
713 * The pending IO might have been the only thing that kept this buffer
714 * in memory. Make sure we have a ref for all this other checks
716 atomic_inc(&eb->refs);
718 reads_done = atomic_dec_and_test(&eb->io_pages);
722 eb->read_mirror = mirror;
723 if (test_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags)) {
727 ret = validate_extent_buffer(eb);
731 * our io error hook is going to dec the io pages
732 * again, we have to make sure it has something
735 atomic_inc(&eb->io_pages);
736 clear_extent_buffer_uptodate(eb);
738 free_extent_buffer(eb);
743 static void end_workqueue_bio(struct bio *bio)
745 struct btrfs_end_io_wq *end_io_wq = bio->bi_private;
746 struct btrfs_fs_info *fs_info;
747 struct btrfs_workqueue *wq;
749 fs_info = end_io_wq->info;
750 end_io_wq->status = bio->bi_status;
752 if (btrfs_op(bio) == BTRFS_MAP_WRITE) {
753 if (end_io_wq->metadata == BTRFS_WQ_ENDIO_METADATA)
754 wq = fs_info->endio_meta_write_workers;
755 else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_FREE_SPACE)
756 wq = fs_info->endio_freespace_worker;
757 else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_RAID56)
758 wq = fs_info->endio_raid56_workers;
760 wq = fs_info->endio_write_workers;
762 if (end_io_wq->metadata == BTRFS_WQ_ENDIO_RAID56)
763 wq = fs_info->endio_raid56_workers;
764 else if (end_io_wq->metadata)
765 wq = fs_info->endio_meta_workers;
767 wq = fs_info->endio_workers;
770 btrfs_init_work(&end_io_wq->work, end_workqueue_fn, NULL, NULL);
771 btrfs_queue_work(wq, &end_io_wq->work);
774 blk_status_t btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
775 enum btrfs_wq_endio_type metadata)
777 struct btrfs_end_io_wq *end_io_wq;
779 end_io_wq = kmem_cache_alloc(btrfs_end_io_wq_cache, GFP_NOFS);
781 return BLK_STS_RESOURCE;
783 end_io_wq->private = bio->bi_private;
784 end_io_wq->end_io = bio->bi_end_io;
785 end_io_wq->info = info;
786 end_io_wq->status = 0;
787 end_io_wq->bio = bio;
788 end_io_wq->metadata = metadata;
790 bio->bi_private = end_io_wq;
791 bio->bi_end_io = end_workqueue_bio;
795 static void run_one_async_start(struct btrfs_work *work)
797 struct async_submit_bio *async;
800 async = container_of(work, struct async_submit_bio, work);
801 ret = async->submit_bio_start(async->inode, async->bio,
802 async->dio_file_offset);
808 * In order to insert checksums into the metadata in large chunks, we wait
809 * until bio submission time. All the pages in the bio are checksummed and
810 * sums are attached onto the ordered extent record.
812 * At IO completion time the csums attached on the ordered extent record are
813 * inserted into the tree.
815 static void run_one_async_done(struct btrfs_work *work)
817 struct async_submit_bio *async;
821 async = container_of(work, struct async_submit_bio, work);
822 inode = async->inode;
824 /* If an error occurred we just want to clean up the bio and move on */
826 async->bio->bi_status = async->status;
827 bio_endio(async->bio);
832 * All of the bios that pass through here are from async helpers.
833 * Use REQ_CGROUP_PUNT to issue them from the owning cgroup's context.
834 * This changes nothing when cgroups aren't in use.
836 async->bio->bi_opf |= REQ_CGROUP_PUNT;
837 ret = btrfs_map_bio(btrfs_sb(inode->i_sb), async->bio, async->mirror_num);
839 async->bio->bi_status = ret;
840 bio_endio(async->bio);
844 static void run_one_async_free(struct btrfs_work *work)
846 struct async_submit_bio *async;
848 async = container_of(work, struct async_submit_bio, work);
852 blk_status_t btrfs_wq_submit_bio(struct inode *inode, struct bio *bio,
853 int mirror_num, u64 dio_file_offset,
854 extent_submit_bio_start_t *submit_bio_start)
856 struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info;
857 struct async_submit_bio *async;
859 async = kmalloc(sizeof(*async), GFP_NOFS);
861 return BLK_STS_RESOURCE;
863 async->inode = inode;
865 async->mirror_num = mirror_num;
866 async->submit_bio_start = submit_bio_start;
868 btrfs_init_work(&async->work, run_one_async_start, run_one_async_done,
871 async->dio_file_offset = dio_file_offset;
875 if (op_is_sync(bio->bi_opf))
876 btrfs_queue_work(fs_info->hipri_workers, &async->work);
878 btrfs_queue_work(fs_info->workers, &async->work);
882 static blk_status_t btree_csum_one_bio(struct bio *bio)
884 struct bio_vec *bvec;
885 struct btrfs_root *root;
887 struct bvec_iter_all iter_all;
889 ASSERT(!bio_flagged(bio, BIO_CLONED));
890 bio_for_each_segment_all(bvec, bio, iter_all) {
891 root = BTRFS_I(bvec->bv_page->mapping->host)->root;
892 ret = csum_dirty_buffer(root->fs_info, bvec);
897 return errno_to_blk_status(ret);
900 static blk_status_t btree_submit_bio_start(struct inode *inode, struct bio *bio,
904 * when we're called for a write, we're already in the async
905 * submission context. Just jump into btrfs_map_bio
907 return btree_csum_one_bio(bio);
910 static bool should_async_write(struct btrfs_fs_info *fs_info,
911 struct btrfs_inode *bi)
913 if (btrfs_is_zoned(fs_info))
915 if (atomic_read(&bi->sync_writers))
917 if (test_bit(BTRFS_FS_CSUM_IMPL_FAST, &fs_info->flags))
922 void btrfs_submit_metadata_bio(struct inode *inode, struct bio *bio, int mirror_num)
924 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
927 if (btrfs_op(bio) != BTRFS_MAP_WRITE) {
929 * called for a read, do the setup so that checksum validation
930 * can happen in the async kernel threads
932 ret = btrfs_bio_wq_end_io(fs_info, bio,
933 BTRFS_WQ_ENDIO_METADATA);
935 ret = btrfs_map_bio(fs_info, bio, mirror_num);
936 } else if (!should_async_write(fs_info, BTRFS_I(inode))) {
937 ret = btree_csum_one_bio(bio);
939 ret = btrfs_map_bio(fs_info, bio, mirror_num);
942 * kthread helpers are used to submit writes so that
943 * checksumming can happen in parallel across all CPUs
945 ret = btrfs_wq_submit_bio(inode, bio, mirror_num, 0,
946 btree_submit_bio_start);
950 bio->bi_status = ret;
955 #ifdef CONFIG_MIGRATION
956 static int btree_migratepage(struct address_space *mapping,
957 struct page *newpage, struct page *page,
958 enum migrate_mode mode)
961 * we can't safely write a btree page from here,
962 * we haven't done the locking hook
967 * Buffers may be managed in a filesystem specific way.
968 * We must have no buffers or drop them.
970 if (page_has_private(page) &&
971 !try_to_release_page(page, GFP_KERNEL))
973 return migrate_page(mapping, newpage, page, mode);
978 static int btree_writepages(struct address_space *mapping,
979 struct writeback_control *wbc)
981 struct btrfs_fs_info *fs_info;
984 if (wbc->sync_mode == WB_SYNC_NONE) {
986 if (wbc->for_kupdate)
989 fs_info = BTRFS_I(mapping->host)->root->fs_info;
990 /* this is a bit racy, but that's ok */
991 ret = __percpu_counter_compare(&fs_info->dirty_metadata_bytes,
992 BTRFS_DIRTY_METADATA_THRESH,
993 fs_info->dirty_metadata_batch);
997 return btree_write_cache_pages(mapping, wbc);
1000 static int btree_releasepage(struct page *page, gfp_t gfp_flags)
1002 if (PageWriteback(page) || PageDirty(page))
1005 return try_release_extent_buffer(page);
1008 static void btree_invalidate_folio(struct folio *folio, size_t offset,
1011 struct extent_io_tree *tree;
1012 tree = &BTRFS_I(folio->mapping->host)->io_tree;
1013 extent_invalidate_folio(tree, folio, offset);
1014 btree_releasepage(&folio->page, GFP_NOFS);
1015 if (folio_get_private(folio)) {
1016 btrfs_warn(BTRFS_I(folio->mapping->host)->root->fs_info,
1017 "folio private not zero on folio %llu",
1018 (unsigned long long)folio_pos(folio));
1019 folio_detach_private(folio);
1024 static bool btree_dirty_folio(struct address_space *mapping,
1025 struct folio *folio)
1027 struct btrfs_fs_info *fs_info = btrfs_sb(mapping->host->i_sb);
1028 struct btrfs_subpage *subpage;
1029 struct extent_buffer *eb;
1031 u64 page_start = folio_pos(folio);
1033 if (fs_info->sectorsize == PAGE_SIZE) {
1034 eb = folio_get_private(folio);
1036 BUG_ON(!test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags));
1037 BUG_ON(!atomic_read(&eb->refs));
1038 btrfs_assert_tree_write_locked(eb);
1039 return filemap_dirty_folio(mapping, folio);
1041 subpage = folio_get_private(folio);
1043 ASSERT(subpage->dirty_bitmap);
1044 while (cur_bit < BTRFS_SUBPAGE_BITMAP_SIZE) {
1045 unsigned long flags;
1047 u16 tmp = (1 << cur_bit);
1049 spin_lock_irqsave(&subpage->lock, flags);
1050 if (!(tmp & subpage->dirty_bitmap)) {
1051 spin_unlock_irqrestore(&subpage->lock, flags);
1055 spin_unlock_irqrestore(&subpage->lock, flags);
1056 cur = page_start + cur_bit * fs_info->sectorsize;
1058 eb = find_extent_buffer(fs_info, cur);
1060 ASSERT(test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags));
1061 ASSERT(atomic_read(&eb->refs));
1062 btrfs_assert_tree_write_locked(eb);
1063 free_extent_buffer(eb);
1065 cur_bit += (fs_info->nodesize >> fs_info->sectorsize_bits);
1067 return filemap_dirty_folio(mapping, folio);
1070 #define btree_dirty_folio filemap_dirty_folio
1073 static const struct address_space_operations btree_aops = {
1074 .writepages = btree_writepages,
1075 .releasepage = btree_releasepage,
1076 .invalidate_folio = btree_invalidate_folio,
1077 #ifdef CONFIG_MIGRATION
1078 .migratepage = btree_migratepage,
1080 .dirty_folio = btree_dirty_folio,
1083 struct extent_buffer *btrfs_find_create_tree_block(
1084 struct btrfs_fs_info *fs_info,
1085 u64 bytenr, u64 owner_root,
1088 if (btrfs_is_testing(fs_info))
1089 return alloc_test_extent_buffer(fs_info, bytenr);
1090 return alloc_extent_buffer(fs_info, bytenr, owner_root, level);
1094 * Read tree block at logical address @bytenr and do variant basic but critical
1097 * @owner_root: the objectid of the root owner for this block.
1098 * @parent_transid: expected transid of this tree block, skip check if 0
1099 * @level: expected level, mandatory check
1100 * @first_key: expected key in slot 0, skip check if NULL
1102 struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
1103 u64 owner_root, u64 parent_transid,
1104 int level, struct btrfs_key *first_key)
1106 struct extent_buffer *buf = NULL;
1109 buf = btrfs_find_create_tree_block(fs_info, bytenr, owner_root, level);
1113 ret = btrfs_read_extent_buffer(buf, parent_transid, level, first_key);
1115 free_extent_buffer_stale(buf);
1116 return ERR_PTR(ret);
1118 if (btrfs_check_eb_owner(buf, owner_root)) {
1119 free_extent_buffer_stale(buf);
1120 return ERR_PTR(-EUCLEAN);
1126 void btrfs_clean_tree_block(struct extent_buffer *buf)
1128 struct btrfs_fs_info *fs_info = buf->fs_info;
1129 if (btrfs_header_generation(buf) ==
1130 fs_info->running_transaction->transid) {
1131 btrfs_assert_tree_write_locked(buf);
1133 if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)) {
1134 percpu_counter_add_batch(&fs_info->dirty_metadata_bytes,
1136 fs_info->dirty_metadata_batch);
1137 clear_extent_buffer_dirty(buf);
1142 static void __setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info,
1145 bool dummy = test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);
1147 memset(&root->root_key, 0, sizeof(root->root_key));
1148 memset(&root->root_item, 0, sizeof(root->root_item));
1149 memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
1150 root->fs_info = fs_info;
1151 root->root_key.objectid = objectid;
1153 root->commit_root = NULL;
1155 RB_CLEAR_NODE(&root->rb_node);
1157 root->last_trans = 0;
1158 root->free_objectid = 0;
1159 root->nr_delalloc_inodes = 0;
1160 root->nr_ordered_extents = 0;
1161 root->inode_tree = RB_ROOT;
1162 xa_init_flags(&root->delayed_nodes, GFP_ATOMIC);
1164 btrfs_init_root_block_rsv(root);
1166 INIT_LIST_HEAD(&root->dirty_list);
1167 INIT_LIST_HEAD(&root->root_list);
1168 INIT_LIST_HEAD(&root->delalloc_inodes);
1169 INIT_LIST_HEAD(&root->delalloc_root);
1170 INIT_LIST_HEAD(&root->ordered_extents);
1171 INIT_LIST_HEAD(&root->ordered_root);
1172 INIT_LIST_HEAD(&root->reloc_dirty_list);
1173 INIT_LIST_HEAD(&root->logged_list[0]);
1174 INIT_LIST_HEAD(&root->logged_list[1]);
1175 spin_lock_init(&root->inode_lock);
1176 spin_lock_init(&root->delalloc_lock);
1177 spin_lock_init(&root->ordered_extent_lock);
1178 spin_lock_init(&root->accounting_lock);
1179 spin_lock_init(&root->log_extents_lock[0]);
1180 spin_lock_init(&root->log_extents_lock[1]);
1181 spin_lock_init(&root->qgroup_meta_rsv_lock);
1182 mutex_init(&root->objectid_mutex);
1183 mutex_init(&root->log_mutex);
1184 mutex_init(&root->ordered_extent_mutex);
1185 mutex_init(&root->delalloc_mutex);
1186 init_waitqueue_head(&root->qgroup_flush_wait);
1187 init_waitqueue_head(&root->log_writer_wait);
1188 init_waitqueue_head(&root->log_commit_wait[0]);
1189 init_waitqueue_head(&root->log_commit_wait[1]);
1190 INIT_LIST_HEAD(&root->log_ctxs[0]);
1191 INIT_LIST_HEAD(&root->log_ctxs[1]);
1192 atomic_set(&root->log_commit[0], 0);
1193 atomic_set(&root->log_commit[1], 0);
1194 atomic_set(&root->log_writers, 0);
1195 atomic_set(&root->log_batch, 0);
1196 refcount_set(&root->refs, 1);
1197 atomic_set(&root->snapshot_force_cow, 0);
1198 atomic_set(&root->nr_swapfiles, 0);
1199 root->log_transid = 0;
1200 root->log_transid_committed = -1;
1201 root->last_log_commit = 0;
1204 extent_io_tree_init(fs_info, &root->dirty_log_pages,
1205 IO_TREE_ROOT_DIRTY_LOG_PAGES, NULL);
1206 extent_io_tree_init(fs_info, &root->log_csum_range,
1207 IO_TREE_LOG_CSUM_RANGE, NULL);
1210 spin_lock_init(&root->root_item_lock);
1211 btrfs_qgroup_init_swapped_blocks(&root->swapped_blocks);
1212 #ifdef CONFIG_BTRFS_DEBUG
1213 INIT_LIST_HEAD(&root->leak_list);
1214 spin_lock(&fs_info->fs_roots_radix_lock);
1215 list_add_tail(&root->leak_list, &fs_info->allocated_roots);
1216 spin_unlock(&fs_info->fs_roots_radix_lock);
1220 static struct btrfs_root *btrfs_alloc_root(struct btrfs_fs_info *fs_info,
1221 u64 objectid, gfp_t flags)
1223 struct btrfs_root *root = kzalloc(sizeof(*root), flags);
1225 __setup_root(root, fs_info, objectid);
1229 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1230 /* Should only be used by the testing infrastructure */
1231 struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info)
1233 struct btrfs_root *root;
1236 return ERR_PTR(-EINVAL);
1238 root = btrfs_alloc_root(fs_info, BTRFS_ROOT_TREE_OBJECTID, GFP_KERNEL);
1240 return ERR_PTR(-ENOMEM);
1242 /* We don't use the stripesize in selftest, set it as sectorsize */
1243 root->alloc_bytenr = 0;
1249 static int global_root_cmp(struct rb_node *a_node, const struct rb_node *b_node)
1251 const struct btrfs_root *a = rb_entry(a_node, struct btrfs_root, rb_node);
1252 const struct btrfs_root *b = rb_entry(b_node, struct btrfs_root, rb_node);
1254 return btrfs_comp_cpu_keys(&a->root_key, &b->root_key);
1257 static int global_root_key_cmp(const void *k, const struct rb_node *node)
1259 const struct btrfs_key *key = k;
1260 const struct btrfs_root *root = rb_entry(node, struct btrfs_root, rb_node);
1262 return btrfs_comp_cpu_keys(key, &root->root_key);
1265 int btrfs_global_root_insert(struct btrfs_root *root)
1267 struct btrfs_fs_info *fs_info = root->fs_info;
1268 struct rb_node *tmp;
1270 write_lock(&fs_info->global_root_lock);
1271 tmp = rb_find_add(&root->rb_node, &fs_info->global_root_tree, global_root_cmp);
1272 write_unlock(&fs_info->global_root_lock);
1275 return tmp ? -EEXIST : 0;
1278 void btrfs_global_root_delete(struct btrfs_root *root)
1280 struct btrfs_fs_info *fs_info = root->fs_info;
1282 write_lock(&fs_info->global_root_lock);
1283 rb_erase(&root->rb_node, &fs_info->global_root_tree);
1284 write_unlock(&fs_info->global_root_lock);
1287 struct btrfs_root *btrfs_global_root(struct btrfs_fs_info *fs_info,
1288 struct btrfs_key *key)
1290 struct rb_node *node;
1291 struct btrfs_root *root = NULL;
1293 read_lock(&fs_info->global_root_lock);
1294 node = rb_find(key, &fs_info->global_root_tree, global_root_key_cmp);
1296 root = container_of(node, struct btrfs_root, rb_node);
1297 read_unlock(&fs_info->global_root_lock);
1302 static u64 btrfs_global_root_id(struct btrfs_fs_info *fs_info, u64 bytenr)
1304 struct btrfs_block_group *block_group;
1307 if (!btrfs_fs_incompat(fs_info, EXTENT_TREE_V2))
1311 block_group = btrfs_lookup_block_group(fs_info, bytenr);
1313 block_group = btrfs_lookup_first_block_group(fs_info, bytenr);
1314 ASSERT(block_group);
1317 ret = block_group->global_root_id;
1318 btrfs_put_block_group(block_group);
1323 struct btrfs_root *btrfs_csum_root(struct btrfs_fs_info *fs_info, u64 bytenr)
1325 struct btrfs_key key = {
1326 .objectid = BTRFS_CSUM_TREE_OBJECTID,
1327 .type = BTRFS_ROOT_ITEM_KEY,
1328 .offset = btrfs_global_root_id(fs_info, bytenr),
1331 return btrfs_global_root(fs_info, &key);
1334 struct btrfs_root *btrfs_extent_root(struct btrfs_fs_info *fs_info, u64 bytenr)
1336 struct btrfs_key key = {
1337 .objectid = BTRFS_EXTENT_TREE_OBJECTID,
1338 .type = BTRFS_ROOT_ITEM_KEY,
1339 .offset = btrfs_global_root_id(fs_info, bytenr),
1342 return btrfs_global_root(fs_info, &key);
1345 struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
1348 struct btrfs_fs_info *fs_info = trans->fs_info;
1349 struct extent_buffer *leaf;
1350 struct btrfs_root *tree_root = fs_info->tree_root;
1351 struct btrfs_root *root;
1352 struct btrfs_key key;
1353 unsigned int nofs_flag;
1357 * We're holding a transaction handle, so use a NOFS memory allocation
1358 * context to avoid deadlock if reclaim happens.
1360 nofs_flag = memalloc_nofs_save();
1361 root = btrfs_alloc_root(fs_info, objectid, GFP_KERNEL);
1362 memalloc_nofs_restore(nofs_flag);
1364 return ERR_PTR(-ENOMEM);
1366 root->root_key.objectid = objectid;
1367 root->root_key.type = BTRFS_ROOT_ITEM_KEY;
1368 root->root_key.offset = 0;
1370 leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0,
1371 BTRFS_NESTING_NORMAL);
1373 ret = PTR_ERR(leaf);
1379 btrfs_mark_buffer_dirty(leaf);
1381 root->commit_root = btrfs_root_node(root);
1382 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
1384 btrfs_set_root_flags(&root->root_item, 0);
1385 btrfs_set_root_limit(&root->root_item, 0);
1386 btrfs_set_root_bytenr(&root->root_item, leaf->start);
1387 btrfs_set_root_generation(&root->root_item, trans->transid);
1388 btrfs_set_root_level(&root->root_item, 0);
1389 btrfs_set_root_refs(&root->root_item, 1);
1390 btrfs_set_root_used(&root->root_item, leaf->len);
1391 btrfs_set_root_last_snapshot(&root->root_item, 0);
1392 btrfs_set_root_dirid(&root->root_item, 0);
1393 if (is_fstree(objectid))
1394 generate_random_guid(root->root_item.uuid);
1396 export_guid(root->root_item.uuid, &guid_null);
1397 btrfs_set_root_drop_level(&root->root_item, 0);
1399 btrfs_tree_unlock(leaf);
1401 key.objectid = objectid;
1402 key.type = BTRFS_ROOT_ITEM_KEY;
1404 ret = btrfs_insert_root(trans, tree_root, &key, &root->root_item);
1412 btrfs_tree_unlock(leaf);
1414 btrfs_put_root(root);
1416 return ERR_PTR(ret);
1419 static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans,
1420 struct btrfs_fs_info *fs_info)
1422 struct btrfs_root *root;
1424 root = btrfs_alloc_root(fs_info, BTRFS_TREE_LOG_OBJECTID, GFP_NOFS);
1426 return ERR_PTR(-ENOMEM);
1428 root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID;
1429 root->root_key.type = BTRFS_ROOT_ITEM_KEY;
1430 root->root_key.offset = BTRFS_TREE_LOG_OBJECTID;
1435 int btrfs_alloc_log_tree_node(struct btrfs_trans_handle *trans,
1436 struct btrfs_root *root)
1438 struct extent_buffer *leaf;
1441 * DON'T set SHAREABLE bit for log trees.
1443 * Log trees are not exposed to user space thus can't be snapshotted,
1444 * and they go away before a real commit is actually done.
1446 * They do store pointers to file data extents, and those reference
1447 * counts still get updated (along with back refs to the log tree).
1450 leaf = btrfs_alloc_tree_block(trans, root, 0, BTRFS_TREE_LOG_OBJECTID,
1451 NULL, 0, 0, 0, BTRFS_NESTING_NORMAL);
1453 return PTR_ERR(leaf);
1457 btrfs_mark_buffer_dirty(root->node);
1458 btrfs_tree_unlock(root->node);
1463 int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
1464 struct btrfs_fs_info *fs_info)
1466 struct btrfs_root *log_root;
1468 log_root = alloc_log_tree(trans, fs_info);
1469 if (IS_ERR(log_root))
1470 return PTR_ERR(log_root);
1472 if (!btrfs_is_zoned(fs_info)) {
1473 int ret = btrfs_alloc_log_tree_node(trans, log_root);
1476 btrfs_put_root(log_root);
1481 WARN_ON(fs_info->log_root_tree);
1482 fs_info->log_root_tree = log_root;
1486 int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
1487 struct btrfs_root *root)
1489 struct btrfs_fs_info *fs_info = root->fs_info;
1490 struct btrfs_root *log_root;
1491 struct btrfs_inode_item *inode_item;
1494 log_root = alloc_log_tree(trans, fs_info);
1495 if (IS_ERR(log_root))
1496 return PTR_ERR(log_root);
1498 ret = btrfs_alloc_log_tree_node(trans, log_root);
1500 btrfs_put_root(log_root);
1504 log_root->last_trans = trans->transid;
1505 log_root->root_key.offset = root->root_key.objectid;
1507 inode_item = &log_root->root_item.inode;
1508 btrfs_set_stack_inode_generation(inode_item, 1);
1509 btrfs_set_stack_inode_size(inode_item, 3);
1510 btrfs_set_stack_inode_nlink(inode_item, 1);
1511 btrfs_set_stack_inode_nbytes(inode_item,
1513 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
1515 btrfs_set_root_node(&log_root->root_item, log_root->node);
1517 WARN_ON(root->log_root);
1518 root->log_root = log_root;
1519 root->log_transid = 0;
1520 root->log_transid_committed = -1;
1521 root->last_log_commit = 0;
1525 static struct btrfs_root *read_tree_root_path(struct btrfs_root *tree_root,
1526 struct btrfs_path *path,
1527 struct btrfs_key *key)
1529 struct btrfs_root *root;
1530 struct btrfs_fs_info *fs_info = tree_root->fs_info;
1535 root = btrfs_alloc_root(fs_info, key->objectid, GFP_NOFS);
1537 return ERR_PTR(-ENOMEM);
1539 ret = btrfs_find_root(tree_root, key, path,
1540 &root->root_item, &root->root_key);
1547 generation = btrfs_root_generation(&root->root_item);
1548 level = btrfs_root_level(&root->root_item);
1549 root->node = read_tree_block(fs_info,
1550 btrfs_root_bytenr(&root->root_item),
1551 key->objectid, generation, level, NULL);
1552 if (IS_ERR(root->node)) {
1553 ret = PTR_ERR(root->node);
1557 if (!btrfs_buffer_uptodate(root->node, generation, 0)) {
1563 * For real fs, and not log/reloc trees, root owner must
1564 * match its root node owner
1566 if (!test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state) &&
1567 root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID &&
1568 root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID &&
1569 root->root_key.objectid != btrfs_header_owner(root->node)) {
1571 "root=%llu block=%llu, tree root owner mismatch, have %llu expect %llu",
1572 root->root_key.objectid, root->node->start,
1573 btrfs_header_owner(root->node),
1574 root->root_key.objectid);
1578 root->commit_root = btrfs_root_node(root);
1581 btrfs_put_root(root);
1582 return ERR_PTR(ret);
1585 struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
1586 struct btrfs_key *key)
1588 struct btrfs_root *root;
1589 struct btrfs_path *path;
1591 path = btrfs_alloc_path();
1593 return ERR_PTR(-ENOMEM);
1594 root = read_tree_root_path(tree_root, path, key);
1595 btrfs_free_path(path);
1601 * Initialize subvolume root in-memory structure
1603 * @anon_dev: anonymous device to attach to the root, if zero, allocate new
1605 static int btrfs_init_fs_root(struct btrfs_root *root, dev_t anon_dev)
1608 unsigned int nofs_flag;
1611 * We might be called under a transaction (e.g. indirect backref
1612 * resolution) which could deadlock if it triggers memory reclaim
1614 nofs_flag = memalloc_nofs_save();
1615 ret = btrfs_drew_lock_init(&root->snapshot_lock);
1616 memalloc_nofs_restore(nofs_flag);
1620 if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID &&
1621 !btrfs_is_data_reloc_root(root)) {
1622 set_bit(BTRFS_ROOT_SHAREABLE, &root->state);
1623 btrfs_check_and_init_root_item(&root->root_item);
1627 * Don't assign anonymous block device to roots that are not exposed to
1628 * userspace, the id pool is limited to 1M
1630 if (is_fstree(root->root_key.objectid) &&
1631 btrfs_root_refs(&root->root_item) > 0) {
1633 ret = get_anon_bdev(&root->anon_dev);
1637 root->anon_dev = anon_dev;
1641 mutex_lock(&root->objectid_mutex);
1642 ret = btrfs_init_root_free_objectid(root);
1644 mutex_unlock(&root->objectid_mutex);
1648 ASSERT(root->free_objectid <= BTRFS_LAST_FREE_OBJECTID);
1650 mutex_unlock(&root->objectid_mutex);
1654 /* The caller is responsible to call btrfs_free_fs_root */
1658 static struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
1661 struct btrfs_root *root;
1663 spin_lock(&fs_info->fs_roots_radix_lock);
1664 root = radix_tree_lookup(&fs_info->fs_roots_radix,
1665 (unsigned long)root_id);
1667 root = btrfs_grab_root(root);
1668 spin_unlock(&fs_info->fs_roots_radix_lock);
1672 static struct btrfs_root *btrfs_get_global_root(struct btrfs_fs_info *fs_info,
1675 struct btrfs_key key = {
1676 .objectid = objectid,
1677 .type = BTRFS_ROOT_ITEM_KEY,
1681 if (objectid == BTRFS_ROOT_TREE_OBJECTID)
1682 return btrfs_grab_root(fs_info->tree_root);
1683 if (objectid == BTRFS_EXTENT_TREE_OBJECTID)
1684 return btrfs_grab_root(btrfs_global_root(fs_info, &key));
1685 if (objectid == BTRFS_CHUNK_TREE_OBJECTID)
1686 return btrfs_grab_root(fs_info->chunk_root);
1687 if (objectid == BTRFS_DEV_TREE_OBJECTID)
1688 return btrfs_grab_root(fs_info->dev_root);
1689 if (objectid == BTRFS_CSUM_TREE_OBJECTID)
1690 return btrfs_grab_root(btrfs_global_root(fs_info, &key));
1691 if (objectid == BTRFS_QUOTA_TREE_OBJECTID)
1692 return btrfs_grab_root(fs_info->quota_root) ?
1693 fs_info->quota_root : ERR_PTR(-ENOENT);
1694 if (objectid == BTRFS_UUID_TREE_OBJECTID)
1695 return btrfs_grab_root(fs_info->uuid_root) ?
1696 fs_info->uuid_root : ERR_PTR(-ENOENT);
1697 if (objectid == BTRFS_FREE_SPACE_TREE_OBJECTID) {
1698 struct btrfs_root *root = btrfs_global_root(fs_info, &key);
1700 return btrfs_grab_root(root) ? root : ERR_PTR(-ENOENT);
1705 int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
1706 struct btrfs_root *root)
1710 ret = radix_tree_preload(GFP_NOFS);
1714 spin_lock(&fs_info->fs_roots_radix_lock);
1715 ret = radix_tree_insert(&fs_info->fs_roots_radix,
1716 (unsigned long)root->root_key.objectid,
1719 btrfs_grab_root(root);
1720 set_bit(BTRFS_ROOT_IN_RADIX, &root->state);
1722 spin_unlock(&fs_info->fs_roots_radix_lock);
1723 radix_tree_preload_end();
1728 void btrfs_check_leaked_roots(struct btrfs_fs_info *fs_info)
1730 #ifdef CONFIG_BTRFS_DEBUG
1731 struct btrfs_root *root;
1733 while (!list_empty(&fs_info->allocated_roots)) {
1734 char buf[BTRFS_ROOT_NAME_BUF_LEN];
1736 root = list_first_entry(&fs_info->allocated_roots,
1737 struct btrfs_root, leak_list);
1738 btrfs_err(fs_info, "leaked root %s refcount %d",
1739 btrfs_root_name(&root->root_key, buf),
1740 refcount_read(&root->refs));
1741 while (refcount_read(&root->refs) > 1)
1742 btrfs_put_root(root);
1743 btrfs_put_root(root);
1748 static void free_global_roots(struct btrfs_fs_info *fs_info)
1750 struct btrfs_root *root;
1751 struct rb_node *node;
1753 while ((node = rb_first_postorder(&fs_info->global_root_tree)) != NULL) {
1754 root = rb_entry(node, struct btrfs_root, rb_node);
1755 rb_erase(&root->rb_node, &fs_info->global_root_tree);
1756 btrfs_put_root(root);
1760 void btrfs_free_fs_info(struct btrfs_fs_info *fs_info)
1762 percpu_counter_destroy(&fs_info->dirty_metadata_bytes);
1763 percpu_counter_destroy(&fs_info->delalloc_bytes);
1764 percpu_counter_destroy(&fs_info->ordered_bytes);
1765 percpu_counter_destroy(&fs_info->dev_replace.bio_counter);
1766 btrfs_free_csum_hash(fs_info);
1767 btrfs_free_stripe_hash_table(fs_info);
1768 btrfs_free_ref_cache(fs_info);
1769 kfree(fs_info->balance_ctl);
1770 kfree(fs_info->delayed_root);
1771 free_global_roots(fs_info);
1772 btrfs_put_root(fs_info->tree_root);
1773 btrfs_put_root(fs_info->chunk_root);
1774 btrfs_put_root(fs_info->dev_root);
1775 btrfs_put_root(fs_info->quota_root);
1776 btrfs_put_root(fs_info->uuid_root);
1777 btrfs_put_root(fs_info->fs_root);
1778 btrfs_put_root(fs_info->data_reloc_root);
1779 btrfs_put_root(fs_info->block_group_root);
1780 btrfs_check_leaked_roots(fs_info);
1781 btrfs_extent_buffer_leak_debug_check(fs_info);
1782 kfree(fs_info->super_copy);
1783 kfree(fs_info->super_for_commit);
1784 kfree(fs_info->subpage_info);
1790 * Get an in-memory reference of a root structure.
1792 * For essential trees like root/extent tree, we grab it from fs_info directly.
1793 * For subvolume trees, we check the cached filesystem roots first. If not
1794 * found, then read it from disk and add it to cached fs roots.
1796 * Caller should release the root by calling btrfs_put_root() after the usage.
1798 * NOTE: Reloc and log trees can't be read by this function as they share the
1799 * same root objectid.
1801 * @objectid: root id
1802 * @anon_dev: preallocated anonymous block device number for new roots,
1803 * pass 0 for new allocation.
1804 * @check_ref: whether to check root item references, If true, return -ENOENT
1807 static struct btrfs_root *btrfs_get_root_ref(struct btrfs_fs_info *fs_info,
1808 u64 objectid, dev_t anon_dev,
1811 struct btrfs_root *root;
1812 struct btrfs_path *path;
1813 struct btrfs_key key;
1816 root = btrfs_get_global_root(fs_info, objectid);
1820 root = btrfs_lookup_fs_root(fs_info, objectid);
1822 /* Shouldn't get preallocated anon_dev for cached roots */
1824 if (check_ref && btrfs_root_refs(&root->root_item) == 0) {
1825 btrfs_put_root(root);
1826 return ERR_PTR(-ENOENT);
1831 key.objectid = objectid;
1832 key.type = BTRFS_ROOT_ITEM_KEY;
1833 key.offset = (u64)-1;
1834 root = btrfs_read_tree_root(fs_info->tree_root, &key);
1838 if (check_ref && btrfs_root_refs(&root->root_item) == 0) {
1843 ret = btrfs_init_fs_root(root, anon_dev);
1847 path = btrfs_alloc_path();
1852 key.objectid = BTRFS_ORPHAN_OBJECTID;
1853 key.type = BTRFS_ORPHAN_ITEM_KEY;
1854 key.offset = objectid;
1856 ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0);
1857 btrfs_free_path(path);
1861 set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state);
1863 ret = btrfs_insert_fs_root(fs_info, root);
1865 if (ret == -EEXIST) {
1866 btrfs_put_root(root);
1874 * If our caller provided us an anonymous device, then it's his
1875 * responsability to free it in case we fail. So we have to set our
1876 * root's anon_dev to 0 to avoid a double free, once by btrfs_put_root()
1877 * and once again by our caller.
1881 btrfs_put_root(root);
1882 return ERR_PTR(ret);
1886 * Get in-memory reference of a root structure
1888 * @objectid: tree objectid
1889 * @check_ref: if set, verify that the tree exists and the item has at least
1892 struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
1893 u64 objectid, bool check_ref)
1895 return btrfs_get_root_ref(fs_info, objectid, 0, check_ref);
1899 * Get in-memory reference of a root structure, created as new, optionally pass
1900 * the anonymous block device id
1902 * @objectid: tree objectid
1903 * @anon_dev: if zero, allocate a new anonymous block device or use the
1906 struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info,
1907 u64 objectid, dev_t anon_dev)
1909 return btrfs_get_root_ref(fs_info, objectid, anon_dev, true);
1913 * btrfs_get_fs_root_commit_root - return a root for the given objectid
1914 * @fs_info: the fs_info
1915 * @objectid: the objectid we need to lookup
1917 * This is exclusively used for backref walking, and exists specifically because
1918 * of how qgroups does lookups. Qgroups will do a backref lookup at delayed ref
1919 * creation time, which means we may have to read the tree_root in order to look
1920 * up a fs root that is not in memory. If the root is not in memory we will
1921 * read the tree root commit root and look up the fs root from there. This is a
1922 * temporary root, it will not be inserted into the radix tree as it doesn't
1923 * have the most uptodate information, it'll simply be discarded once the
1924 * backref code is finished using the root.
1926 struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info,
1927 struct btrfs_path *path,
1930 struct btrfs_root *root;
1931 struct btrfs_key key;
1933 ASSERT(path->search_commit_root && path->skip_locking);
1936 * This can return -ENOENT if we ask for a root that doesn't exist, but
1937 * since this is called via the backref walking code we won't be looking
1938 * up a root that doesn't exist, unless there's corruption. So if root
1939 * != NULL just return it.
1941 root = btrfs_get_global_root(fs_info, objectid);
1945 root = btrfs_lookup_fs_root(fs_info, objectid);
1949 key.objectid = objectid;
1950 key.type = BTRFS_ROOT_ITEM_KEY;
1951 key.offset = (u64)-1;
1952 root = read_tree_root_path(fs_info->tree_root, path, &key);
1953 btrfs_release_path(path);
1959 * called by the kthread helper functions to finally call the bio end_io
1960 * functions. This is where read checksum verification actually happens
1962 static void end_workqueue_fn(struct btrfs_work *work)
1965 struct btrfs_end_io_wq *end_io_wq;
1967 end_io_wq = container_of(work, struct btrfs_end_io_wq, work);
1968 bio = end_io_wq->bio;
1970 bio->bi_status = end_io_wq->status;
1971 bio->bi_private = end_io_wq->private;
1972 bio->bi_end_io = end_io_wq->end_io;
1974 kmem_cache_free(btrfs_end_io_wq_cache, end_io_wq);
1977 static int cleaner_kthread(void *arg)
1979 struct btrfs_fs_info *fs_info = arg;
1985 set_bit(BTRFS_FS_CLEANER_RUNNING, &fs_info->flags);
1987 /* Make the cleaner go to sleep early. */
1988 if (btrfs_need_cleaner_sleep(fs_info))
1992 * Do not do anything if we might cause open_ctree() to block
1993 * before we have finished mounting the filesystem.
1995 if (!test_bit(BTRFS_FS_OPEN, &fs_info->flags))
1998 if (!mutex_trylock(&fs_info->cleaner_mutex))
2002 * Avoid the problem that we change the status of the fs
2003 * during the above check and trylock.
2005 if (btrfs_need_cleaner_sleep(fs_info)) {
2006 mutex_unlock(&fs_info->cleaner_mutex);
2010 btrfs_run_delayed_iputs(fs_info);
2012 again = btrfs_clean_one_deleted_snapshot(fs_info);
2013 mutex_unlock(&fs_info->cleaner_mutex);
2016 * The defragger has dealt with the R/O remount and umount,
2017 * needn't do anything special here.
2019 btrfs_run_defrag_inodes(fs_info);
2022 * Acquires fs_info->reclaim_bgs_lock to avoid racing
2023 * with relocation (btrfs_relocate_chunk) and relocation
2024 * acquires fs_info->cleaner_mutex (btrfs_relocate_block_group)
2025 * after acquiring fs_info->reclaim_bgs_lock. So we
2026 * can't hold, nor need to, fs_info->cleaner_mutex when deleting
2027 * unused block groups.
2029 btrfs_delete_unused_bgs(fs_info);
2032 * Reclaim block groups in the reclaim_bgs list after we deleted
2033 * all unused block_groups. This possibly gives us some more free
2036 btrfs_reclaim_bgs(fs_info);
2038 clear_and_wake_up_bit(BTRFS_FS_CLEANER_RUNNING, &fs_info->flags);
2039 if (kthread_should_park())
2041 if (kthread_should_stop())
2044 set_current_state(TASK_INTERRUPTIBLE);
2046 __set_current_state(TASK_RUNNING);
2051 static int transaction_kthread(void *arg)
2053 struct btrfs_root *root = arg;
2054 struct btrfs_fs_info *fs_info = root->fs_info;
2055 struct btrfs_trans_handle *trans;
2056 struct btrfs_transaction *cur;
2059 unsigned long delay;
2063 cannot_commit = false;
2064 delay = msecs_to_jiffies(fs_info->commit_interval * 1000);
2065 mutex_lock(&fs_info->transaction_kthread_mutex);
2067 spin_lock(&fs_info->trans_lock);
2068 cur = fs_info->running_transaction;
2070 spin_unlock(&fs_info->trans_lock);
2074 delta = ktime_get_seconds() - cur->start_time;
2075 if (!test_and_clear_bit(BTRFS_FS_COMMIT_TRANS, &fs_info->flags) &&
2076 cur->state < TRANS_STATE_COMMIT_START &&
2077 delta < fs_info->commit_interval) {
2078 spin_unlock(&fs_info->trans_lock);
2079 delay -= msecs_to_jiffies((delta - 1) * 1000);
2081 msecs_to_jiffies(fs_info->commit_interval * 1000));
2084 transid = cur->transid;
2085 spin_unlock(&fs_info->trans_lock);
2087 /* If the file system is aborted, this will always fail. */
2088 trans = btrfs_attach_transaction(root);
2089 if (IS_ERR(trans)) {
2090 if (PTR_ERR(trans) != -ENOENT)
2091 cannot_commit = true;
2094 if (transid == trans->transid) {
2095 btrfs_commit_transaction(trans);
2097 btrfs_end_transaction(trans);
2100 wake_up_process(fs_info->cleaner_kthread);
2101 mutex_unlock(&fs_info->transaction_kthread_mutex);
2103 if (BTRFS_FS_ERROR(fs_info))
2104 btrfs_cleanup_transaction(fs_info);
2105 if (!kthread_should_stop() &&
2106 (!btrfs_transaction_blocked(fs_info) ||
2108 schedule_timeout_interruptible(delay);
2109 } while (!kthread_should_stop());
2114 * This will find the highest generation in the array of root backups. The
2115 * index of the highest array is returned, or -EINVAL if we can't find
2118 * We check to make sure the array is valid by comparing the
2119 * generation of the latest root in the array with the generation
2120 * in the super block. If they don't match we pitch it.
2122 static int find_newest_super_backup(struct btrfs_fs_info *info)
2124 const u64 newest_gen = btrfs_super_generation(info->super_copy);
2126 struct btrfs_root_backup *root_backup;
2129 for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
2130 root_backup = info->super_copy->super_roots + i;
2131 cur = btrfs_backup_tree_root_gen(root_backup);
2132 if (cur == newest_gen)
2140 * copy all the root pointers into the super backup array.
2141 * this will bump the backup pointer by one when it is
2144 static void backup_super_roots(struct btrfs_fs_info *info)
2146 const int next_backup = info->backup_root_index;
2147 struct btrfs_root_backup *root_backup;
2149 root_backup = info->super_for_commit->super_roots + next_backup;
2152 * make sure all of our padding and empty slots get zero filled
2153 * regardless of which ones we use today
2155 memset(root_backup, 0, sizeof(*root_backup));
2157 info->backup_root_index = (next_backup + 1) % BTRFS_NUM_BACKUP_ROOTS;
2159 btrfs_set_backup_tree_root(root_backup, info->tree_root->node->start);
2160 btrfs_set_backup_tree_root_gen(root_backup,
2161 btrfs_header_generation(info->tree_root->node));
2163 btrfs_set_backup_tree_root_level(root_backup,
2164 btrfs_header_level(info->tree_root->node));
2166 btrfs_set_backup_chunk_root(root_backup, info->chunk_root->node->start);
2167 btrfs_set_backup_chunk_root_gen(root_backup,
2168 btrfs_header_generation(info->chunk_root->node));
2169 btrfs_set_backup_chunk_root_level(root_backup,
2170 btrfs_header_level(info->chunk_root->node));
2172 if (btrfs_fs_incompat(info, EXTENT_TREE_V2)) {
2173 btrfs_set_backup_block_group_root(root_backup,
2174 info->block_group_root->node->start);
2175 btrfs_set_backup_block_group_root_gen(root_backup,
2176 btrfs_header_generation(info->block_group_root->node));
2177 btrfs_set_backup_block_group_root_level(root_backup,
2178 btrfs_header_level(info->block_group_root->node));
2180 struct btrfs_root *extent_root = btrfs_extent_root(info, 0);
2181 struct btrfs_root *csum_root = btrfs_csum_root(info, 0);
2183 btrfs_set_backup_extent_root(root_backup,
2184 extent_root->node->start);
2185 btrfs_set_backup_extent_root_gen(root_backup,
2186 btrfs_header_generation(extent_root->node));
2187 btrfs_set_backup_extent_root_level(root_backup,
2188 btrfs_header_level(extent_root->node));
2190 btrfs_set_backup_csum_root(root_backup, csum_root->node->start);
2191 btrfs_set_backup_csum_root_gen(root_backup,
2192 btrfs_header_generation(csum_root->node));
2193 btrfs_set_backup_csum_root_level(root_backup,
2194 btrfs_header_level(csum_root->node));
2198 * we might commit during log recovery, which happens before we set
2199 * the fs_root. Make sure it is valid before we fill it in.
2201 if (info->fs_root && info->fs_root->node) {
2202 btrfs_set_backup_fs_root(root_backup,
2203 info->fs_root->node->start);
2204 btrfs_set_backup_fs_root_gen(root_backup,
2205 btrfs_header_generation(info->fs_root->node));
2206 btrfs_set_backup_fs_root_level(root_backup,
2207 btrfs_header_level(info->fs_root->node));
2210 btrfs_set_backup_dev_root(root_backup, info->dev_root->node->start);
2211 btrfs_set_backup_dev_root_gen(root_backup,
2212 btrfs_header_generation(info->dev_root->node));
2213 btrfs_set_backup_dev_root_level(root_backup,
2214 btrfs_header_level(info->dev_root->node));
2216 btrfs_set_backup_total_bytes(root_backup,
2217 btrfs_super_total_bytes(info->super_copy));
2218 btrfs_set_backup_bytes_used(root_backup,
2219 btrfs_super_bytes_used(info->super_copy));
2220 btrfs_set_backup_num_devices(root_backup,
2221 btrfs_super_num_devices(info->super_copy));
2224 * if we don't copy this out to the super_copy, it won't get remembered
2225 * for the next commit
2227 memcpy(&info->super_copy->super_roots,
2228 &info->super_for_commit->super_roots,
2229 sizeof(*root_backup) * BTRFS_NUM_BACKUP_ROOTS);
2233 * read_backup_root - Reads a backup root based on the passed priority. Prio 0
2234 * is the newest, prio 1/2/3 are 2nd newest/3rd newest/4th (oldest) backup roots
2236 * fs_info - filesystem whose backup roots need to be read
2237 * priority - priority of backup root required
2239 * Returns backup root index on success and -EINVAL otherwise.
2241 static int read_backup_root(struct btrfs_fs_info *fs_info, u8 priority)
2243 int backup_index = find_newest_super_backup(fs_info);
2244 struct btrfs_super_block *super = fs_info->super_copy;
2245 struct btrfs_root_backup *root_backup;
2247 if (priority < BTRFS_NUM_BACKUP_ROOTS && backup_index >= 0) {
2249 return backup_index;
2251 backup_index = backup_index + BTRFS_NUM_BACKUP_ROOTS - priority;
2252 backup_index %= BTRFS_NUM_BACKUP_ROOTS;
2257 root_backup = super->super_roots + backup_index;
2259 btrfs_set_super_generation(super,
2260 btrfs_backup_tree_root_gen(root_backup));
2261 btrfs_set_super_root(super, btrfs_backup_tree_root(root_backup));
2262 btrfs_set_super_root_level(super,
2263 btrfs_backup_tree_root_level(root_backup));
2264 btrfs_set_super_bytes_used(super, btrfs_backup_bytes_used(root_backup));
2267 * Fixme: the total bytes and num_devices need to match or we should
2270 btrfs_set_super_total_bytes(super, btrfs_backup_total_bytes(root_backup));
2271 btrfs_set_super_num_devices(super, btrfs_backup_num_devices(root_backup));
2273 return backup_index;
2276 /* helper to cleanup workers */
2277 static void btrfs_stop_all_workers(struct btrfs_fs_info *fs_info)
2279 btrfs_destroy_workqueue(fs_info->fixup_workers);
2280 btrfs_destroy_workqueue(fs_info->delalloc_workers);
2281 btrfs_destroy_workqueue(fs_info->hipri_workers);
2282 btrfs_destroy_workqueue(fs_info->workers);
2283 btrfs_destroy_workqueue(fs_info->endio_workers);
2284 btrfs_destroy_workqueue(fs_info->endio_raid56_workers);
2285 if (fs_info->rmw_workers)
2286 destroy_workqueue(fs_info->rmw_workers);
2287 btrfs_destroy_workqueue(fs_info->endio_write_workers);
2288 btrfs_destroy_workqueue(fs_info->endio_freespace_worker);
2289 btrfs_destroy_workqueue(fs_info->delayed_workers);
2290 btrfs_destroy_workqueue(fs_info->caching_workers);
2291 btrfs_destroy_workqueue(fs_info->flush_workers);
2292 btrfs_destroy_workqueue(fs_info->qgroup_rescan_workers);
2293 if (fs_info->discard_ctl.discard_workers)
2294 destroy_workqueue(fs_info->discard_ctl.discard_workers);
2296 * Now that all other work queues are destroyed, we can safely destroy
2297 * the queues used for metadata I/O, since tasks from those other work
2298 * queues can do metadata I/O operations.
2300 btrfs_destroy_workqueue(fs_info->endio_meta_workers);
2301 btrfs_destroy_workqueue(fs_info->endio_meta_write_workers);
2304 static void free_root_extent_buffers(struct btrfs_root *root)
2307 free_extent_buffer(root->node);
2308 free_extent_buffer(root->commit_root);
2310 root->commit_root = NULL;
2314 static void free_global_root_pointers(struct btrfs_fs_info *fs_info)
2316 struct btrfs_root *root, *tmp;
2318 rbtree_postorder_for_each_entry_safe(root, tmp,
2319 &fs_info->global_root_tree,
2321 free_root_extent_buffers(root);
2324 /* helper to cleanup tree roots */
2325 static void free_root_pointers(struct btrfs_fs_info *info, bool free_chunk_root)
2327 free_root_extent_buffers(info->tree_root);
2329 free_global_root_pointers(info);
2330 free_root_extent_buffers(info->dev_root);
2331 free_root_extent_buffers(info->quota_root);
2332 free_root_extent_buffers(info->uuid_root);
2333 free_root_extent_buffers(info->fs_root);
2334 free_root_extent_buffers(info->data_reloc_root);
2335 free_root_extent_buffers(info->block_group_root);
2336 if (free_chunk_root)
2337 free_root_extent_buffers(info->chunk_root);
2340 void btrfs_put_root(struct btrfs_root *root)
2345 if (refcount_dec_and_test(&root->refs)) {
2346 WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree));
2347 WARN_ON(test_bit(BTRFS_ROOT_DEAD_RELOC_TREE, &root->state));
2349 free_anon_bdev(root->anon_dev);
2350 btrfs_drew_lock_destroy(&root->snapshot_lock);
2351 free_root_extent_buffers(root);
2352 #ifdef CONFIG_BTRFS_DEBUG
2353 spin_lock(&root->fs_info->fs_roots_radix_lock);
2354 list_del_init(&root->leak_list);
2355 spin_unlock(&root->fs_info->fs_roots_radix_lock);
2361 void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info)
2364 struct btrfs_root *gang[8];
2367 while (!list_empty(&fs_info->dead_roots)) {
2368 gang[0] = list_entry(fs_info->dead_roots.next,
2369 struct btrfs_root, root_list);
2370 list_del(&gang[0]->root_list);
2372 if (test_bit(BTRFS_ROOT_IN_RADIX, &gang[0]->state))
2373 btrfs_drop_and_free_fs_root(fs_info, gang[0]);
2374 btrfs_put_root(gang[0]);
2378 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
2383 for (i = 0; i < ret; i++)
2384 btrfs_drop_and_free_fs_root(fs_info, gang[i]);
2388 static void btrfs_init_scrub(struct btrfs_fs_info *fs_info)
2390 mutex_init(&fs_info->scrub_lock);
2391 atomic_set(&fs_info->scrubs_running, 0);
2392 atomic_set(&fs_info->scrub_pause_req, 0);
2393 atomic_set(&fs_info->scrubs_paused, 0);
2394 atomic_set(&fs_info->scrub_cancel_req, 0);
2395 init_waitqueue_head(&fs_info->scrub_pause_wait);
2396 refcount_set(&fs_info->scrub_workers_refcnt, 0);
2399 static void btrfs_init_balance(struct btrfs_fs_info *fs_info)
2401 spin_lock_init(&fs_info->balance_lock);
2402 mutex_init(&fs_info->balance_mutex);
2403 atomic_set(&fs_info->balance_pause_req, 0);
2404 atomic_set(&fs_info->balance_cancel_req, 0);
2405 fs_info->balance_ctl = NULL;
2406 init_waitqueue_head(&fs_info->balance_wait_q);
2407 atomic_set(&fs_info->reloc_cancel_req, 0);
2410 static void btrfs_init_btree_inode(struct btrfs_fs_info *fs_info)
2412 struct inode *inode = fs_info->btree_inode;
2414 inode->i_ino = BTRFS_BTREE_INODE_OBJECTID;
2415 set_nlink(inode, 1);
2417 * we set the i_size on the btree inode to the max possible int.
2418 * the real end of the address space is determined by all of
2419 * the devices in the system
2421 inode->i_size = OFFSET_MAX;
2422 inode->i_mapping->a_ops = &btree_aops;
2424 RB_CLEAR_NODE(&BTRFS_I(inode)->rb_node);
2425 extent_io_tree_init(fs_info, &BTRFS_I(inode)->io_tree,
2426 IO_TREE_BTREE_INODE_IO, inode);
2427 BTRFS_I(inode)->io_tree.track_uptodate = false;
2428 extent_map_tree_init(&BTRFS_I(inode)->extent_tree);
2430 BTRFS_I(inode)->root = btrfs_grab_root(fs_info->tree_root);
2431 memset(&BTRFS_I(inode)->location, 0, sizeof(struct btrfs_key));
2432 set_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags);
2433 btrfs_insert_inode_hash(inode);
2436 static void btrfs_init_dev_replace_locks(struct btrfs_fs_info *fs_info)
2438 mutex_init(&fs_info->dev_replace.lock_finishing_cancel_unmount);
2439 init_rwsem(&fs_info->dev_replace.rwsem);
2440 init_waitqueue_head(&fs_info->dev_replace.replace_wait);
2443 static void btrfs_init_qgroup(struct btrfs_fs_info *fs_info)
2445 spin_lock_init(&fs_info->qgroup_lock);
2446 mutex_init(&fs_info->qgroup_ioctl_lock);
2447 fs_info->qgroup_tree = RB_ROOT;
2448 INIT_LIST_HEAD(&fs_info->dirty_qgroups);
2449 fs_info->qgroup_seq = 1;
2450 fs_info->qgroup_ulist = NULL;
2451 fs_info->qgroup_rescan_running = false;
2452 mutex_init(&fs_info->qgroup_rescan_lock);
2455 static int btrfs_init_workqueues(struct btrfs_fs_info *fs_info)
2457 u32 max_active = fs_info->thread_pool_size;
2458 unsigned int flags = WQ_MEM_RECLAIM | WQ_FREEZABLE | WQ_UNBOUND;
2461 btrfs_alloc_workqueue(fs_info, "worker", flags, max_active, 16);
2462 fs_info->hipri_workers =
2463 btrfs_alloc_workqueue(fs_info, "worker-high",
2464 flags | WQ_HIGHPRI, max_active, 16);
2466 fs_info->delalloc_workers =
2467 btrfs_alloc_workqueue(fs_info, "delalloc",
2468 flags, max_active, 2);
2470 fs_info->flush_workers =
2471 btrfs_alloc_workqueue(fs_info, "flush_delalloc",
2472 flags, max_active, 0);
2474 fs_info->caching_workers =
2475 btrfs_alloc_workqueue(fs_info, "cache", flags, max_active, 0);
2477 fs_info->fixup_workers =
2478 btrfs_alloc_workqueue(fs_info, "fixup", flags, 1, 0);
2481 * endios are largely parallel and should have a very
2484 fs_info->endio_workers =
2485 btrfs_alloc_workqueue(fs_info, "endio", flags, max_active, 4);
2486 fs_info->endio_meta_workers =
2487 btrfs_alloc_workqueue(fs_info, "endio-meta", flags,
2489 fs_info->endio_meta_write_workers =
2490 btrfs_alloc_workqueue(fs_info, "endio-meta-write", flags,
2492 fs_info->endio_raid56_workers =
2493 btrfs_alloc_workqueue(fs_info, "endio-raid56", flags,
2495 fs_info->rmw_workers = alloc_workqueue("btrfs-rmw", flags, max_active);
2496 fs_info->endio_write_workers =
2497 btrfs_alloc_workqueue(fs_info, "endio-write", flags,
2499 fs_info->endio_freespace_worker =
2500 btrfs_alloc_workqueue(fs_info, "freespace-write", flags,
2502 fs_info->delayed_workers =
2503 btrfs_alloc_workqueue(fs_info, "delayed-meta", flags,
2505 fs_info->qgroup_rescan_workers =
2506 btrfs_alloc_workqueue(fs_info, "qgroup-rescan", flags, 1, 0);
2507 fs_info->discard_ctl.discard_workers =
2508 alloc_workqueue("btrfs_discard", WQ_UNBOUND | WQ_FREEZABLE, 1);
2510 if (!(fs_info->workers && fs_info->hipri_workers &&
2511 fs_info->delalloc_workers && fs_info->flush_workers &&
2512 fs_info->endio_workers && fs_info->endio_meta_workers &&
2513 fs_info->endio_meta_write_workers &&
2514 fs_info->endio_write_workers && fs_info->endio_raid56_workers &&
2515 fs_info->endio_freespace_worker && fs_info->rmw_workers &&
2516 fs_info->caching_workers && fs_info->fixup_workers &&
2517 fs_info->delayed_workers && fs_info->qgroup_rescan_workers &&
2518 fs_info->discard_ctl.discard_workers)) {
2525 static int btrfs_init_csum_hash(struct btrfs_fs_info *fs_info, u16 csum_type)
2527 struct crypto_shash *csum_shash;
2528 const char *csum_driver = btrfs_super_csum_driver(csum_type);
2530 csum_shash = crypto_alloc_shash(csum_driver, 0, 0);
2532 if (IS_ERR(csum_shash)) {
2533 btrfs_err(fs_info, "error allocating %s hash for checksum",
2535 return PTR_ERR(csum_shash);
2538 fs_info->csum_shash = csum_shash;
2543 static int btrfs_replay_log(struct btrfs_fs_info *fs_info,
2544 struct btrfs_fs_devices *fs_devices)
2547 struct btrfs_root *log_tree_root;
2548 struct btrfs_super_block *disk_super = fs_info->super_copy;
2549 u64 bytenr = btrfs_super_log_root(disk_super);
2550 int level = btrfs_super_log_root_level(disk_super);
2552 if (fs_devices->rw_devices == 0) {
2553 btrfs_warn(fs_info, "log replay required on RO media");
2557 log_tree_root = btrfs_alloc_root(fs_info, BTRFS_TREE_LOG_OBJECTID,
2562 log_tree_root->node = read_tree_block(fs_info, bytenr,
2563 BTRFS_TREE_LOG_OBJECTID,
2564 fs_info->generation + 1, level,
2566 if (IS_ERR(log_tree_root->node)) {
2567 btrfs_warn(fs_info, "failed to read log tree");
2568 ret = PTR_ERR(log_tree_root->node);
2569 log_tree_root->node = NULL;
2570 btrfs_put_root(log_tree_root);
2573 if (!extent_buffer_uptodate(log_tree_root->node)) {
2574 btrfs_err(fs_info, "failed to read log tree");
2575 btrfs_put_root(log_tree_root);
2579 /* returns with log_tree_root freed on success */
2580 ret = btrfs_recover_log_trees(log_tree_root);
2582 btrfs_handle_fs_error(fs_info, ret,
2583 "Failed to recover log tree");
2584 btrfs_put_root(log_tree_root);
2588 if (sb_rdonly(fs_info->sb)) {
2589 ret = btrfs_commit_super(fs_info);
2597 static int load_global_roots_objectid(struct btrfs_root *tree_root,
2598 struct btrfs_path *path, u64 objectid,
2601 struct btrfs_fs_info *fs_info = tree_root->fs_info;
2602 struct btrfs_root *root;
2603 u64 max_global_id = 0;
2605 struct btrfs_key key = {
2606 .objectid = objectid,
2607 .type = BTRFS_ROOT_ITEM_KEY,
2612 /* If we have IGNOREDATACSUMS skip loading these roots. */
2613 if (objectid == BTRFS_CSUM_TREE_OBJECTID &&
2614 btrfs_test_opt(fs_info, IGNOREDATACSUMS)) {
2615 set_bit(BTRFS_FS_STATE_NO_CSUMS, &fs_info->fs_state);
2620 ret = btrfs_search_slot(NULL, tree_root, &key, path, 0, 0);
2624 if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
2625 ret = btrfs_next_leaf(tree_root, path);
2634 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
2635 if (key.objectid != objectid)
2637 btrfs_release_path(path);
2640 * Just worry about this for extent tree, it'll be the same for
2643 if (objectid == BTRFS_EXTENT_TREE_OBJECTID)
2644 max_global_id = max(max_global_id, key.offset);
2647 root = read_tree_root_path(tree_root, path, &key);
2649 if (!btrfs_test_opt(fs_info, IGNOREBADROOTS))
2650 ret = PTR_ERR(root);
2653 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2654 ret = btrfs_global_root_insert(root);
2656 btrfs_put_root(root);
2661 btrfs_release_path(path);
2663 if (objectid == BTRFS_EXTENT_TREE_OBJECTID)
2664 fs_info->nr_global_roots = max_global_id + 1;
2666 if (!found || ret) {
2667 if (objectid == BTRFS_CSUM_TREE_OBJECTID)
2668 set_bit(BTRFS_FS_STATE_NO_CSUMS, &fs_info->fs_state);
2670 if (!btrfs_test_opt(fs_info, IGNOREBADROOTS))
2671 ret = ret ? ret : -ENOENT;
2674 btrfs_err(fs_info, "failed to load root %s", name);
2679 static int load_global_roots(struct btrfs_root *tree_root)
2681 struct btrfs_path *path;
2684 path = btrfs_alloc_path();
2688 ret = load_global_roots_objectid(tree_root, path,
2689 BTRFS_EXTENT_TREE_OBJECTID, "extent");
2692 ret = load_global_roots_objectid(tree_root, path,
2693 BTRFS_CSUM_TREE_OBJECTID, "csum");
2696 if (!btrfs_fs_compat_ro(tree_root->fs_info, FREE_SPACE_TREE))
2698 ret = load_global_roots_objectid(tree_root, path,
2699 BTRFS_FREE_SPACE_TREE_OBJECTID,
2702 btrfs_free_path(path);
2706 static int btrfs_read_roots(struct btrfs_fs_info *fs_info)
2708 struct btrfs_root *tree_root = fs_info->tree_root;
2709 struct btrfs_root *root;
2710 struct btrfs_key location;
2713 BUG_ON(!fs_info->tree_root);
2715 ret = load_global_roots(tree_root);
2719 location.objectid = BTRFS_DEV_TREE_OBJECTID;
2720 location.type = BTRFS_ROOT_ITEM_KEY;
2721 location.offset = 0;
2723 root = btrfs_read_tree_root(tree_root, &location);
2725 if (!btrfs_test_opt(fs_info, IGNOREBADROOTS)) {
2726 ret = PTR_ERR(root);
2730 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2731 fs_info->dev_root = root;
2733 /* Initialize fs_info for all devices in any case */
2734 btrfs_init_devices_late(fs_info);
2737 * This tree can share blocks with some other fs tree during relocation
2738 * and we need a proper setup by btrfs_get_fs_root
2740 root = btrfs_get_fs_root(tree_root->fs_info,
2741 BTRFS_DATA_RELOC_TREE_OBJECTID, true);
2743 if (!btrfs_test_opt(fs_info, IGNOREBADROOTS)) {
2744 ret = PTR_ERR(root);
2748 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2749 fs_info->data_reloc_root = root;
2752 location.objectid = BTRFS_QUOTA_TREE_OBJECTID;
2753 root = btrfs_read_tree_root(tree_root, &location);
2754 if (!IS_ERR(root)) {
2755 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2756 set_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags);
2757 fs_info->quota_root = root;
2760 location.objectid = BTRFS_UUID_TREE_OBJECTID;
2761 root = btrfs_read_tree_root(tree_root, &location);
2763 if (!btrfs_test_opt(fs_info, IGNOREBADROOTS)) {
2764 ret = PTR_ERR(root);
2769 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2770 fs_info->uuid_root = root;
2775 btrfs_warn(fs_info, "failed to read root (objectid=%llu): %d",
2776 location.objectid, ret);
2781 * Real super block validation
2782 * NOTE: super csum type and incompat features will not be checked here.
2784 * @sb: super block to check
2785 * @mirror_num: the super block number to check its bytenr:
2786 * 0 the primary (1st) sb
2787 * 1, 2 2nd and 3rd backup copy
2788 * -1 skip bytenr check
2790 static int validate_super(struct btrfs_fs_info *fs_info,
2791 struct btrfs_super_block *sb, int mirror_num)
2793 u64 nodesize = btrfs_super_nodesize(sb);
2794 u64 sectorsize = btrfs_super_sectorsize(sb);
2797 if (btrfs_super_magic(sb) != BTRFS_MAGIC) {
2798 btrfs_err(fs_info, "no valid FS found");
2801 if (btrfs_super_flags(sb) & ~BTRFS_SUPER_FLAG_SUPP) {
2802 btrfs_err(fs_info, "unrecognized or unsupported super flag: %llu",
2803 btrfs_super_flags(sb) & ~BTRFS_SUPER_FLAG_SUPP);
2806 if (btrfs_super_root_level(sb) >= BTRFS_MAX_LEVEL) {
2807 btrfs_err(fs_info, "tree_root level too big: %d >= %d",
2808 btrfs_super_root_level(sb), BTRFS_MAX_LEVEL);
2811 if (btrfs_super_chunk_root_level(sb) >= BTRFS_MAX_LEVEL) {
2812 btrfs_err(fs_info, "chunk_root level too big: %d >= %d",
2813 btrfs_super_chunk_root_level(sb), BTRFS_MAX_LEVEL);
2816 if (btrfs_super_log_root_level(sb) >= BTRFS_MAX_LEVEL) {
2817 btrfs_err(fs_info, "log_root level too big: %d >= %d",
2818 btrfs_super_log_root_level(sb), BTRFS_MAX_LEVEL);
2823 * Check sectorsize and nodesize first, other check will need it.
2824 * Check all possible sectorsize(4K, 8K, 16K, 32K, 64K) here.
2826 if (!is_power_of_2(sectorsize) || sectorsize < 4096 ||
2827 sectorsize > BTRFS_MAX_METADATA_BLOCKSIZE) {
2828 btrfs_err(fs_info, "invalid sectorsize %llu", sectorsize);
2833 * We only support at most two sectorsizes: 4K and PAGE_SIZE.
2835 * We can support 16K sectorsize with 64K page size without problem,
2836 * but such sectorsize/pagesize combination doesn't make much sense.
2837 * 4K will be our future standard, PAGE_SIZE is supported from the very
2840 if (sectorsize > PAGE_SIZE || (sectorsize != SZ_4K && sectorsize != PAGE_SIZE)) {
2842 "sectorsize %llu not yet supported for page size %lu",
2843 sectorsize, PAGE_SIZE);
2847 if (!is_power_of_2(nodesize) || nodesize < sectorsize ||
2848 nodesize > BTRFS_MAX_METADATA_BLOCKSIZE) {
2849 btrfs_err(fs_info, "invalid nodesize %llu", nodesize);
2852 if (nodesize != le32_to_cpu(sb->__unused_leafsize)) {
2853 btrfs_err(fs_info, "invalid leafsize %u, should be %llu",
2854 le32_to_cpu(sb->__unused_leafsize), nodesize);
2858 /* Root alignment check */
2859 if (!IS_ALIGNED(btrfs_super_root(sb), sectorsize)) {
2860 btrfs_warn(fs_info, "tree_root block unaligned: %llu",
2861 btrfs_super_root(sb));
2864 if (!IS_ALIGNED(btrfs_super_chunk_root(sb), sectorsize)) {
2865 btrfs_warn(fs_info, "chunk_root block unaligned: %llu",
2866 btrfs_super_chunk_root(sb));
2869 if (!IS_ALIGNED(btrfs_super_log_root(sb), sectorsize)) {
2870 btrfs_warn(fs_info, "log_root block unaligned: %llu",
2871 btrfs_super_log_root(sb));
2875 if (memcmp(fs_info->fs_devices->fsid, fs_info->super_copy->fsid,
2878 "superblock fsid doesn't match fsid of fs_devices: %pU != %pU",
2879 fs_info->super_copy->fsid, fs_info->fs_devices->fsid);
2883 if (btrfs_fs_incompat(fs_info, METADATA_UUID) &&
2884 memcmp(fs_info->fs_devices->metadata_uuid,
2885 fs_info->super_copy->metadata_uuid, BTRFS_FSID_SIZE)) {
2887 "superblock metadata_uuid doesn't match metadata uuid of fs_devices: %pU != %pU",
2888 fs_info->super_copy->metadata_uuid,
2889 fs_info->fs_devices->metadata_uuid);
2893 if (memcmp(fs_info->fs_devices->metadata_uuid, sb->dev_item.fsid,
2894 BTRFS_FSID_SIZE) != 0) {
2896 "dev_item UUID does not match metadata fsid: %pU != %pU",
2897 fs_info->fs_devices->metadata_uuid, sb->dev_item.fsid);
2902 * Hint to catch really bogus numbers, bitflips or so, more exact checks are
2905 if (btrfs_super_bytes_used(sb) < 6 * btrfs_super_nodesize(sb)) {
2906 btrfs_err(fs_info, "bytes_used is too small %llu",
2907 btrfs_super_bytes_used(sb));
2910 if (!is_power_of_2(btrfs_super_stripesize(sb))) {
2911 btrfs_err(fs_info, "invalid stripesize %u",
2912 btrfs_super_stripesize(sb));
2915 if (btrfs_super_num_devices(sb) > (1UL << 31))
2916 btrfs_warn(fs_info, "suspicious number of devices: %llu",
2917 btrfs_super_num_devices(sb));
2918 if (btrfs_super_num_devices(sb) == 0) {
2919 btrfs_err(fs_info, "number of devices is 0");
2923 if (mirror_num >= 0 &&
2924 btrfs_super_bytenr(sb) != btrfs_sb_offset(mirror_num)) {
2925 btrfs_err(fs_info, "super offset mismatch %llu != %u",
2926 btrfs_super_bytenr(sb), BTRFS_SUPER_INFO_OFFSET);
2931 * Obvious sys_chunk_array corruptions, it must hold at least one key
2934 if (btrfs_super_sys_array_size(sb) > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) {
2935 btrfs_err(fs_info, "system chunk array too big %u > %u",
2936 btrfs_super_sys_array_size(sb),
2937 BTRFS_SYSTEM_CHUNK_ARRAY_SIZE);
2940 if (btrfs_super_sys_array_size(sb) < sizeof(struct btrfs_disk_key)
2941 + sizeof(struct btrfs_chunk)) {
2942 btrfs_err(fs_info, "system chunk array too small %u < %zu",
2943 btrfs_super_sys_array_size(sb),
2944 sizeof(struct btrfs_disk_key)
2945 + sizeof(struct btrfs_chunk));
2950 * The generation is a global counter, we'll trust it more than the others
2951 * but it's still possible that it's the one that's wrong.
2953 if (btrfs_super_generation(sb) < btrfs_super_chunk_root_generation(sb))
2955 "suspicious: generation < chunk_root_generation: %llu < %llu",
2956 btrfs_super_generation(sb),
2957 btrfs_super_chunk_root_generation(sb));
2958 if (btrfs_super_generation(sb) < btrfs_super_cache_generation(sb)
2959 && btrfs_super_cache_generation(sb) != (u64)-1)
2961 "suspicious: generation < cache_generation: %llu < %llu",
2962 btrfs_super_generation(sb),
2963 btrfs_super_cache_generation(sb));
2969 * Validation of super block at mount time.
2970 * Some checks already done early at mount time, like csum type and incompat
2971 * flags will be skipped.
2973 static int btrfs_validate_mount_super(struct btrfs_fs_info *fs_info)
2975 return validate_super(fs_info, fs_info->super_copy, 0);
2979 * Validation of super block at write time.
2980 * Some checks like bytenr check will be skipped as their values will be
2982 * Extra checks like csum type and incompat flags will be done here.
2984 static int btrfs_validate_write_super(struct btrfs_fs_info *fs_info,
2985 struct btrfs_super_block *sb)
2989 ret = validate_super(fs_info, sb, -1);
2992 if (!btrfs_supported_super_csum(btrfs_super_csum_type(sb))) {
2994 btrfs_err(fs_info, "invalid csum type, has %u want %u",
2995 btrfs_super_csum_type(sb), BTRFS_CSUM_TYPE_CRC32);
2998 if (btrfs_super_incompat_flags(sb) & ~BTRFS_FEATURE_INCOMPAT_SUPP) {
3001 "invalid incompat flags, has 0x%llx valid mask 0x%llx",
3002 btrfs_super_incompat_flags(sb),
3003 (unsigned long long)BTRFS_FEATURE_INCOMPAT_SUPP);
3009 "super block corruption detected before writing it to disk");
3013 static int load_super_root(struct btrfs_root *root, u64 bytenr, u64 gen, int level)
3017 root->node = read_tree_block(root->fs_info, bytenr,
3018 root->root_key.objectid, gen, level, NULL);
3019 if (IS_ERR(root->node)) {
3020 ret = PTR_ERR(root->node);
3024 if (!extent_buffer_uptodate(root->node)) {
3025 free_extent_buffer(root->node);
3030 btrfs_set_root_node(&root->root_item, root->node);
3031 root->commit_root = btrfs_root_node(root);
3032 btrfs_set_root_refs(&root->root_item, 1);
3036 static int load_important_roots(struct btrfs_fs_info *fs_info)
3038 struct btrfs_super_block *sb = fs_info->super_copy;
3042 bytenr = btrfs_super_root(sb);
3043 gen = btrfs_super_generation(sb);
3044 level = btrfs_super_root_level(sb);
3045 ret = load_super_root(fs_info->tree_root, bytenr, gen, level);
3047 btrfs_warn(fs_info, "couldn't read tree root");
3051 if (!btrfs_fs_incompat(fs_info, EXTENT_TREE_V2))
3054 bytenr = btrfs_super_block_group_root(sb);
3055 gen = btrfs_super_block_group_root_generation(sb);
3056 level = btrfs_super_block_group_root_level(sb);
3057 ret = load_super_root(fs_info->block_group_root, bytenr, gen, level);
3059 btrfs_warn(fs_info, "couldn't read block group root");
3063 static int __cold init_tree_roots(struct btrfs_fs_info *fs_info)
3065 int backup_index = find_newest_super_backup(fs_info);
3066 struct btrfs_super_block *sb = fs_info->super_copy;
3067 struct btrfs_root *tree_root = fs_info->tree_root;
3068 bool handle_error = false;
3072 if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) {
3073 struct btrfs_root *root;
3075 root = btrfs_alloc_root(fs_info, BTRFS_BLOCK_GROUP_TREE_OBJECTID,
3079 fs_info->block_group_root = root;
3082 for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
3084 if (!IS_ERR(tree_root->node))
3085 free_extent_buffer(tree_root->node);
3086 tree_root->node = NULL;
3088 if (!btrfs_test_opt(fs_info, USEBACKUPROOT))
3091 free_root_pointers(fs_info, 0);
3094 * Don't use the log in recovery mode, it won't be
3097 btrfs_set_super_log_root(sb, 0);
3099 /* We can't trust the free space cache either */
3100 btrfs_set_opt(fs_info->mount_opt, CLEAR_CACHE);
3102 ret = read_backup_root(fs_info, i);
3108 ret = load_important_roots(fs_info);
3110 handle_error = true;
3115 * No need to hold btrfs_root::objectid_mutex since the fs
3116 * hasn't been fully initialised and we are the only user
3118 ret = btrfs_init_root_free_objectid(tree_root);
3120 handle_error = true;
3124 ASSERT(tree_root->free_objectid <= BTRFS_LAST_FREE_OBJECTID);
3126 ret = btrfs_read_roots(fs_info);
3128 handle_error = true;
3132 /* All successful */
3133 fs_info->generation = btrfs_header_generation(tree_root->node);
3134 fs_info->last_trans_committed = fs_info->generation;
3135 fs_info->last_reloc_trans = 0;
3137 /* Always begin writing backup roots after the one being used */
3138 if (backup_index < 0) {
3139 fs_info->backup_root_index = 0;
3141 fs_info->backup_root_index = backup_index + 1;
3142 fs_info->backup_root_index %= BTRFS_NUM_BACKUP_ROOTS;
3150 void btrfs_init_fs_info(struct btrfs_fs_info *fs_info)
3152 INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC);
3153 xa_init_flags(&fs_info->extent_buffers, GFP_ATOMIC);
3154 INIT_LIST_HEAD(&fs_info->trans_list);
3155 INIT_LIST_HEAD(&fs_info->dead_roots);
3156 INIT_LIST_HEAD(&fs_info->delayed_iputs);
3157 INIT_LIST_HEAD(&fs_info->delalloc_roots);
3158 INIT_LIST_HEAD(&fs_info->caching_block_groups);
3159 spin_lock_init(&fs_info->delalloc_root_lock);
3160 spin_lock_init(&fs_info->trans_lock);
3161 spin_lock_init(&fs_info->fs_roots_radix_lock);
3162 spin_lock_init(&fs_info->delayed_iput_lock);
3163 spin_lock_init(&fs_info->defrag_inodes_lock);
3164 spin_lock_init(&fs_info->super_lock);
3165 spin_lock_init(&fs_info->buffer_lock);
3166 spin_lock_init(&fs_info->unused_bgs_lock);
3167 spin_lock_init(&fs_info->treelog_bg_lock);
3168 spin_lock_init(&fs_info->zone_active_bgs_lock);
3169 spin_lock_init(&fs_info->relocation_bg_lock);
3170 rwlock_init(&fs_info->tree_mod_log_lock);
3171 rwlock_init(&fs_info->global_root_lock);
3172 mutex_init(&fs_info->unused_bg_unpin_mutex);
3173 mutex_init(&fs_info->reclaim_bgs_lock);
3174 mutex_init(&fs_info->reloc_mutex);
3175 mutex_init(&fs_info->delalloc_root_mutex);
3176 mutex_init(&fs_info->zoned_meta_io_lock);
3177 mutex_init(&fs_info->zoned_data_reloc_io_lock);
3178 seqlock_init(&fs_info->profiles_lock);
3180 INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
3181 INIT_LIST_HEAD(&fs_info->space_info);
3182 INIT_LIST_HEAD(&fs_info->tree_mod_seq_list);
3183 INIT_LIST_HEAD(&fs_info->unused_bgs);
3184 INIT_LIST_HEAD(&fs_info->reclaim_bgs);
3185 INIT_LIST_HEAD(&fs_info->zone_active_bgs);
3186 #ifdef CONFIG_BTRFS_DEBUG
3187 INIT_LIST_HEAD(&fs_info->allocated_roots);
3188 INIT_LIST_HEAD(&fs_info->allocated_ebs);
3189 spin_lock_init(&fs_info->eb_leak_lock);
3191 extent_map_tree_init(&fs_info->mapping_tree);
3192 btrfs_init_block_rsv(&fs_info->global_block_rsv,
3193 BTRFS_BLOCK_RSV_GLOBAL);
3194 btrfs_init_block_rsv(&fs_info->trans_block_rsv, BTRFS_BLOCK_RSV_TRANS);
3195 btrfs_init_block_rsv(&fs_info->chunk_block_rsv, BTRFS_BLOCK_RSV_CHUNK);
3196 btrfs_init_block_rsv(&fs_info->empty_block_rsv, BTRFS_BLOCK_RSV_EMPTY);
3197 btrfs_init_block_rsv(&fs_info->delayed_block_rsv,
3198 BTRFS_BLOCK_RSV_DELOPS);
3199 btrfs_init_block_rsv(&fs_info->delayed_refs_rsv,
3200 BTRFS_BLOCK_RSV_DELREFS);
3202 atomic_set(&fs_info->async_delalloc_pages, 0);
3203 atomic_set(&fs_info->defrag_running, 0);
3204 atomic_set(&fs_info->nr_delayed_iputs, 0);
3205 atomic64_set(&fs_info->tree_mod_seq, 0);
3206 fs_info->global_root_tree = RB_ROOT;
3207 fs_info->max_inline = BTRFS_DEFAULT_MAX_INLINE;
3208 fs_info->metadata_ratio = 0;
3209 fs_info->defrag_inodes = RB_ROOT;
3210 atomic64_set(&fs_info->free_chunk_space, 0);
3211 fs_info->tree_mod_log = RB_ROOT;
3212 fs_info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL;
3213 fs_info->avg_delayed_ref_runtime = NSEC_PER_SEC >> 6; /* div by 64 */
3214 btrfs_init_ref_verify(fs_info);
3216 fs_info->thread_pool_size = min_t(unsigned long,
3217 num_online_cpus() + 2, 8);
3219 INIT_LIST_HEAD(&fs_info->ordered_roots);
3220 spin_lock_init(&fs_info->ordered_root_lock);
3222 btrfs_init_scrub(fs_info);
3223 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
3224 fs_info->check_integrity_print_mask = 0;
3226 btrfs_init_balance(fs_info);
3227 btrfs_init_async_reclaim_work(fs_info);
3229 rwlock_init(&fs_info->block_group_cache_lock);
3230 fs_info->block_group_cache_tree = RB_ROOT_CACHED;
3232 extent_io_tree_init(fs_info, &fs_info->excluded_extents,
3233 IO_TREE_FS_EXCLUDED_EXTENTS, NULL);
3235 mutex_init(&fs_info->ordered_operations_mutex);
3236 mutex_init(&fs_info->tree_log_mutex);
3237 mutex_init(&fs_info->chunk_mutex);
3238 mutex_init(&fs_info->transaction_kthread_mutex);
3239 mutex_init(&fs_info->cleaner_mutex);
3240 mutex_init(&fs_info->ro_block_group_mutex);
3241 init_rwsem(&fs_info->commit_root_sem);
3242 init_rwsem(&fs_info->cleanup_work_sem);
3243 init_rwsem(&fs_info->subvol_sem);
3244 sema_init(&fs_info->uuid_tree_rescan_sem, 1);
3246 btrfs_init_dev_replace_locks(fs_info);
3247 btrfs_init_qgroup(fs_info);
3248 btrfs_discard_init(fs_info);
3250 btrfs_init_free_cluster(&fs_info->meta_alloc_cluster);
3251 btrfs_init_free_cluster(&fs_info->data_alloc_cluster);
3253 init_waitqueue_head(&fs_info->transaction_throttle);
3254 init_waitqueue_head(&fs_info->transaction_wait);
3255 init_waitqueue_head(&fs_info->transaction_blocked_wait);
3256 init_waitqueue_head(&fs_info->async_submit_wait);
3257 init_waitqueue_head(&fs_info->delayed_iputs_wait);
3259 /* Usable values until the real ones are cached from the superblock */
3260 fs_info->nodesize = 4096;
3261 fs_info->sectorsize = 4096;
3262 fs_info->sectorsize_bits = ilog2(4096);
3263 fs_info->stripesize = 4096;
3265 spin_lock_init(&fs_info->swapfile_pins_lock);
3266 fs_info->swapfile_pins = RB_ROOT;
3268 fs_info->bg_reclaim_threshold = BTRFS_DEFAULT_RECLAIM_THRESH;
3269 INIT_WORK(&fs_info->reclaim_bgs_work, btrfs_reclaim_bgs_work);
3272 static int init_mount_fs_info(struct btrfs_fs_info *fs_info, struct super_block *sb)
3277 sb->s_blocksize = BTRFS_BDEV_BLOCKSIZE;
3278 sb->s_blocksize_bits = blksize_bits(BTRFS_BDEV_BLOCKSIZE);
3280 ret = percpu_counter_init(&fs_info->ordered_bytes, 0, GFP_KERNEL);
3284 ret = percpu_counter_init(&fs_info->dirty_metadata_bytes, 0, GFP_KERNEL);
3288 fs_info->dirty_metadata_batch = PAGE_SIZE *
3289 (1 + ilog2(nr_cpu_ids));
3291 ret = percpu_counter_init(&fs_info->delalloc_bytes, 0, GFP_KERNEL);
3295 ret = percpu_counter_init(&fs_info->dev_replace.bio_counter, 0,
3300 fs_info->delayed_root = kmalloc(sizeof(struct btrfs_delayed_root),
3302 if (!fs_info->delayed_root)
3304 btrfs_init_delayed_root(fs_info->delayed_root);
3307 set_bit(BTRFS_FS_STATE_RO, &fs_info->fs_state);
3309 return btrfs_alloc_stripe_hash_table(fs_info);
3312 static int btrfs_uuid_rescan_kthread(void *data)
3314 struct btrfs_fs_info *fs_info = data;
3318 * 1st step is to iterate through the existing UUID tree and
3319 * to delete all entries that contain outdated data.
3320 * 2nd step is to add all missing entries to the UUID tree.
3322 ret = btrfs_uuid_tree_iterate(fs_info);
3325 btrfs_warn(fs_info, "iterating uuid_tree failed %d",
3327 up(&fs_info->uuid_tree_rescan_sem);
3330 return btrfs_uuid_scan_kthread(data);
3333 static int btrfs_check_uuid_tree(struct btrfs_fs_info *fs_info)
3335 struct task_struct *task;
3337 down(&fs_info->uuid_tree_rescan_sem);
3338 task = kthread_run(btrfs_uuid_rescan_kthread, fs_info, "btrfs-uuid");
3340 /* fs_info->update_uuid_tree_gen remains 0 in all error case */
3341 btrfs_warn(fs_info, "failed to start uuid_rescan task");
3342 up(&fs_info->uuid_tree_rescan_sem);
3343 return PTR_ERR(task);
3350 * Some options only have meaning at mount time and shouldn't persist across
3351 * remounts, or be displayed. Clear these at the end of mount and remount
3354 void btrfs_clear_oneshot_options(struct btrfs_fs_info *fs_info)
3356 btrfs_clear_opt(fs_info->mount_opt, USEBACKUPROOT);
3357 btrfs_clear_opt(fs_info->mount_opt, CLEAR_CACHE);
3361 * Mounting logic specific to read-write file systems. Shared by open_ctree
3362 * and btrfs_remount when remounting from read-only to read-write.
3364 int btrfs_start_pre_rw_mount(struct btrfs_fs_info *fs_info)
3367 const bool cache_opt = btrfs_test_opt(fs_info, SPACE_CACHE);
3368 bool clear_free_space_tree = false;
3370 if (btrfs_test_opt(fs_info, CLEAR_CACHE) &&
3371 btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
3372 clear_free_space_tree = true;
3373 } else if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE) &&
3374 !btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE_VALID)) {
3375 btrfs_warn(fs_info, "free space tree is invalid");
3376 clear_free_space_tree = true;
3379 if (clear_free_space_tree) {
3380 btrfs_info(fs_info, "clearing free space tree");
3381 ret = btrfs_clear_free_space_tree(fs_info);
3384 "failed to clear free space tree: %d", ret);
3390 * btrfs_find_orphan_roots() is responsible for finding all the dead
3391 * roots (with 0 refs), flag them with BTRFS_ROOT_DEAD_TREE and load
3392 * them into the fs_info->fs_roots_radix tree. This must be done before
3393 * calling btrfs_orphan_cleanup() on the tree root. If we don't do it
3394 * first, then btrfs_orphan_cleanup() will delete a dead root's orphan
3395 * item before the root's tree is deleted - this means that if we unmount
3396 * or crash before the deletion completes, on the next mount we will not
3397 * delete what remains of the tree because the orphan item does not
3398 * exists anymore, which is what tells us we have a pending deletion.
3400 ret = btrfs_find_orphan_roots(fs_info);
3404 ret = btrfs_cleanup_fs_roots(fs_info);
3408 down_read(&fs_info->cleanup_work_sem);
3409 if ((ret = btrfs_orphan_cleanup(fs_info->fs_root)) ||
3410 (ret = btrfs_orphan_cleanup(fs_info->tree_root))) {
3411 up_read(&fs_info->cleanup_work_sem);
3414 up_read(&fs_info->cleanup_work_sem);
3416 mutex_lock(&fs_info->cleaner_mutex);
3417 ret = btrfs_recover_relocation(fs_info);
3418 mutex_unlock(&fs_info->cleaner_mutex);
3420 btrfs_warn(fs_info, "failed to recover relocation: %d", ret);
3424 if (btrfs_test_opt(fs_info, FREE_SPACE_TREE) &&
3425 !btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
3426 btrfs_info(fs_info, "creating free space tree");
3427 ret = btrfs_create_free_space_tree(fs_info);
3430 "failed to create free space tree: %d", ret);
3435 if (cache_opt != btrfs_free_space_cache_v1_active(fs_info)) {
3436 ret = btrfs_set_free_space_cache_v1_active(fs_info, cache_opt);
3441 ret = btrfs_resume_balance_async(fs_info);
3445 ret = btrfs_resume_dev_replace_async(fs_info);
3447 btrfs_warn(fs_info, "failed to resume dev_replace");
3451 btrfs_qgroup_rescan_resume(fs_info);
3453 if (!fs_info->uuid_root) {
3454 btrfs_info(fs_info, "creating UUID tree");
3455 ret = btrfs_create_uuid_tree(fs_info);
3458 "failed to create the UUID tree %d", ret);
3467 int __cold open_ctree(struct super_block *sb, struct btrfs_fs_devices *fs_devices,
3476 struct btrfs_super_block *disk_super;
3477 struct btrfs_fs_info *fs_info = btrfs_sb(sb);
3478 struct btrfs_root *tree_root;
3479 struct btrfs_root *chunk_root;
3484 ret = init_mount_fs_info(fs_info, sb);
3490 /* These need to be init'ed before we start creating inodes and such. */
3491 tree_root = btrfs_alloc_root(fs_info, BTRFS_ROOT_TREE_OBJECTID,
3493 fs_info->tree_root = tree_root;
3494 chunk_root = btrfs_alloc_root(fs_info, BTRFS_CHUNK_TREE_OBJECTID,
3496 fs_info->chunk_root = chunk_root;
3497 if (!tree_root || !chunk_root) {
3502 fs_info->btree_inode = new_inode(sb);
3503 if (!fs_info->btree_inode) {
3507 mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
3508 btrfs_init_btree_inode(fs_info);
3510 invalidate_bdev(fs_devices->latest_dev->bdev);
3513 * Read super block and check the signature bytes only
3515 disk_super = btrfs_read_dev_super(fs_devices->latest_dev->bdev);
3516 if (IS_ERR(disk_super)) {
3517 err = PTR_ERR(disk_super);
3522 * Verify the type first, if that or the checksum value are
3523 * corrupted, we'll find out
3525 csum_type = btrfs_super_csum_type(disk_super);
3526 if (!btrfs_supported_super_csum(csum_type)) {
3527 btrfs_err(fs_info, "unsupported checksum algorithm: %u",
3530 btrfs_release_disk_super(disk_super);
3534 fs_info->csum_size = btrfs_super_csum_size(disk_super);
3536 ret = btrfs_init_csum_hash(fs_info, csum_type);
3539 btrfs_release_disk_super(disk_super);
3544 * We want to check superblock checksum, the type is stored inside.
3545 * Pass the whole disk block of size BTRFS_SUPER_INFO_SIZE (4k).
3547 if (btrfs_check_super_csum(fs_info, (u8 *)disk_super)) {
3548 btrfs_err(fs_info, "superblock checksum mismatch");
3550 btrfs_release_disk_super(disk_super);
3555 * super_copy is zeroed at allocation time and we never touch the
3556 * following bytes up to INFO_SIZE, the checksum is calculated from
3557 * the whole block of INFO_SIZE
3559 memcpy(fs_info->super_copy, disk_super, sizeof(*fs_info->super_copy));
3560 btrfs_release_disk_super(disk_super);
3562 disk_super = fs_info->super_copy;
3565 features = btrfs_super_flags(disk_super);
3566 if (features & BTRFS_SUPER_FLAG_CHANGING_FSID_V2) {
3567 features &= ~BTRFS_SUPER_FLAG_CHANGING_FSID_V2;
3568 btrfs_set_super_flags(disk_super, features);
3570 "found metadata UUID change in progress flag, clearing");
3573 memcpy(fs_info->super_for_commit, fs_info->super_copy,
3574 sizeof(*fs_info->super_for_commit));
3576 ret = btrfs_validate_mount_super(fs_info);
3578 btrfs_err(fs_info, "superblock contains fatal errors");
3583 if (!btrfs_super_root(disk_super))
3586 /* check FS state, whether FS is broken. */
3587 if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_ERROR)
3588 set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state);
3591 * In the long term, we'll store the compression type in the super
3592 * block, and it'll be used for per file compression control.
3594 fs_info->compress_type = BTRFS_COMPRESS_ZLIB;
3597 * Flag our filesystem as having big metadata blocks if they are bigger
3598 * than the page size.
3600 if (btrfs_super_nodesize(disk_super) > PAGE_SIZE) {
3601 if (!(features & BTRFS_FEATURE_INCOMPAT_BIG_METADATA))
3603 "flagging fs with big metadata feature");
3604 features |= BTRFS_FEATURE_INCOMPAT_BIG_METADATA;
3607 /* Set up fs_info before parsing mount options */
3608 nodesize = btrfs_super_nodesize(disk_super);
3609 sectorsize = btrfs_super_sectorsize(disk_super);
3610 stripesize = sectorsize;
3611 fs_info->dirty_metadata_batch = nodesize * (1 + ilog2(nr_cpu_ids));
3612 fs_info->delalloc_batch = sectorsize * 512 * (1 + ilog2(nr_cpu_ids));
3614 fs_info->nodesize = nodesize;
3615 fs_info->sectorsize = sectorsize;
3616 fs_info->sectorsize_bits = ilog2(sectorsize);
3617 fs_info->csums_per_leaf = BTRFS_MAX_ITEM_SIZE(fs_info) / fs_info->csum_size;
3618 fs_info->stripesize = stripesize;
3620 ret = btrfs_parse_options(fs_info, options, sb->s_flags);
3626 features = btrfs_super_incompat_flags(disk_super) &
3627 ~BTRFS_FEATURE_INCOMPAT_SUPP;
3630 "cannot mount because of unsupported optional features (0x%llx)",
3636 features = btrfs_super_incompat_flags(disk_super);
3637 features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
3638 if (fs_info->compress_type == BTRFS_COMPRESS_LZO)
3639 features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO;
3640 else if (fs_info->compress_type == BTRFS_COMPRESS_ZSTD)
3641 features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD;
3643 if (features & BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA)
3644 btrfs_info(fs_info, "has skinny extents");
3647 * mixed block groups end up with duplicate but slightly offset
3648 * extent buffers for the same range. It leads to corruptions
3650 if ((features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) &&
3651 (sectorsize != nodesize)) {
3653 "unequal nodesize/sectorsize (%u != %u) are not allowed for mixed block groups",
3654 nodesize, sectorsize);
3659 * Needn't use the lock because there is no other task which will
3662 btrfs_set_super_incompat_flags(disk_super, features);
3664 features = btrfs_super_compat_ro_flags(disk_super) &
3665 ~BTRFS_FEATURE_COMPAT_RO_SUPP;
3666 if (!sb_rdonly(sb) && features) {
3668 "cannot mount read-write because of unsupported optional features (0x%llx)",
3674 if (sectorsize < PAGE_SIZE) {
3675 struct btrfs_subpage_info *subpage_info;
3678 * V1 space cache has some hardcoded PAGE_SIZE usage, and is
3679 * going to be deprecated.
3681 * Force to use v2 cache for subpage case.
3683 btrfs_clear_opt(fs_info->mount_opt, SPACE_CACHE);
3684 btrfs_set_and_info(fs_info, FREE_SPACE_TREE,
3685 "forcing free space tree for sector size %u with page size %lu",
3686 sectorsize, PAGE_SIZE);
3689 "read-write for sector size %u with page size %lu is experimental",
3690 sectorsize, PAGE_SIZE);
3691 subpage_info = kzalloc(sizeof(*subpage_info), GFP_KERNEL);
3694 btrfs_init_subpage_info(subpage_info, sectorsize);
3695 fs_info->subpage_info = subpage_info;
3698 ret = btrfs_init_workqueues(fs_info);
3701 goto fail_sb_buffer;
3704 sb->s_bdi->ra_pages *= btrfs_super_num_devices(disk_super);
3705 sb->s_bdi->ra_pages = max(sb->s_bdi->ra_pages, SZ_4M / PAGE_SIZE);
3707 sb->s_blocksize = sectorsize;
3708 sb->s_blocksize_bits = blksize_bits(sectorsize);
3709 memcpy(&sb->s_uuid, fs_info->fs_devices->fsid, BTRFS_FSID_SIZE);
3711 mutex_lock(&fs_info->chunk_mutex);
3712 ret = btrfs_read_sys_array(fs_info);
3713 mutex_unlock(&fs_info->chunk_mutex);
3715 btrfs_err(fs_info, "failed to read the system array: %d", ret);
3716 goto fail_sb_buffer;
3719 generation = btrfs_super_chunk_root_generation(disk_super);
3720 level = btrfs_super_chunk_root_level(disk_super);
3721 ret = load_super_root(chunk_root, btrfs_super_chunk_root(disk_super),
3724 btrfs_err(fs_info, "failed to read chunk root");
3725 goto fail_tree_roots;
3728 read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
3729 offsetof(struct btrfs_header, chunk_tree_uuid),
3732 ret = btrfs_read_chunk_tree(fs_info);
3734 btrfs_err(fs_info, "failed to read chunk tree: %d", ret);
3735 goto fail_tree_roots;
3739 * At this point we know all the devices that make this filesystem,
3740 * including the seed devices but we don't know yet if the replace
3741 * target is required. So free devices that are not part of this
3742 * filesystem but skip the replace target device which is checked
3743 * below in btrfs_init_dev_replace().
3745 btrfs_free_extra_devids(fs_devices);
3746 if (!fs_devices->latest_dev->bdev) {
3747 btrfs_err(fs_info, "failed to read devices");
3748 goto fail_tree_roots;
3751 ret = init_tree_roots(fs_info);
3753 goto fail_tree_roots;
3756 * Get zone type information of zoned block devices. This will also
3757 * handle emulation of a zoned filesystem if a regular device has the
3758 * zoned incompat feature flag set.
3760 ret = btrfs_get_dev_zone_info_all_devices(fs_info);
3763 "zoned: failed to read device zone info: %d",
3765 goto fail_block_groups;
3769 * If we have a uuid root and we're not being told to rescan we need to
3770 * check the generation here so we can set the
3771 * BTRFS_FS_UPDATE_UUID_TREE_GEN bit. Otherwise we could commit the
3772 * transaction during a balance or the log replay without updating the
3773 * uuid generation, and then if we crash we would rescan the uuid tree,
3774 * even though it was perfectly fine.
3776 if (fs_info->uuid_root && !btrfs_test_opt(fs_info, RESCAN_UUID_TREE) &&
3777 fs_info->generation == btrfs_super_uuid_tree_generation(disk_super))
3778 set_bit(BTRFS_FS_UPDATE_UUID_TREE_GEN, &fs_info->flags);
3780 ret = btrfs_verify_dev_extents(fs_info);
3783 "failed to verify dev extents against chunks: %d",
3785 goto fail_block_groups;
3787 ret = btrfs_recover_balance(fs_info);
3789 btrfs_err(fs_info, "failed to recover balance: %d", ret);
3790 goto fail_block_groups;
3793 ret = btrfs_init_dev_stats(fs_info);
3795 btrfs_err(fs_info, "failed to init dev_stats: %d", ret);
3796 goto fail_block_groups;
3799 ret = btrfs_init_dev_replace(fs_info);
3801 btrfs_err(fs_info, "failed to init dev_replace: %d", ret);
3802 goto fail_block_groups;
3805 ret = btrfs_check_zoned_mode(fs_info);
3807 btrfs_err(fs_info, "failed to initialize zoned mode: %d",
3809 goto fail_block_groups;
3812 ret = btrfs_sysfs_add_fsid(fs_devices);
3814 btrfs_err(fs_info, "failed to init sysfs fsid interface: %d",
3816 goto fail_block_groups;
3819 ret = btrfs_sysfs_add_mounted(fs_info);
3821 btrfs_err(fs_info, "failed to init sysfs interface: %d", ret);
3822 goto fail_fsdev_sysfs;
3825 ret = btrfs_init_space_info(fs_info);
3827 btrfs_err(fs_info, "failed to initialize space info: %d", ret);
3831 ret = btrfs_read_block_groups(fs_info);
3833 btrfs_err(fs_info, "failed to read block groups: %d", ret);
3837 btrfs_free_zone_cache(fs_info);
3839 if (!sb_rdonly(sb) && fs_info->fs_devices->missing_devices &&
3840 !btrfs_check_rw_degradable(fs_info, NULL)) {
3842 "writable mount is not allowed due to too many missing devices");
3846 fs_info->cleaner_kthread = kthread_run(cleaner_kthread, fs_info,
3848 if (IS_ERR(fs_info->cleaner_kthread))
3851 fs_info->transaction_kthread = kthread_run(transaction_kthread,
3853 "btrfs-transaction");
3854 if (IS_ERR(fs_info->transaction_kthread))
3857 if (!btrfs_test_opt(fs_info, NOSSD) &&
3858 !fs_info->fs_devices->rotating) {
3859 btrfs_set_and_info(fs_info, SSD, "enabling ssd optimizations");
3863 * Mount does not set all options immediately, we can do it now and do
3864 * not have to wait for transaction commit
3866 btrfs_apply_pending_changes(fs_info);
3868 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
3869 if (btrfs_test_opt(fs_info, CHECK_INTEGRITY)) {
3870 ret = btrfsic_mount(fs_info, fs_devices,
3871 btrfs_test_opt(fs_info,
3872 CHECK_INTEGRITY_DATA) ? 1 : 0,
3873 fs_info->check_integrity_print_mask);
3876 "failed to initialize integrity check module: %d",
3880 ret = btrfs_read_qgroup_config(fs_info);
3882 goto fail_trans_kthread;
3884 if (btrfs_build_ref_tree(fs_info))
3885 btrfs_err(fs_info, "couldn't build ref tree");
3887 /* do not make disk changes in broken FS or nologreplay is given */
3888 if (btrfs_super_log_root(disk_super) != 0 &&
3889 !btrfs_test_opt(fs_info, NOLOGREPLAY)) {
3890 btrfs_info(fs_info, "start tree-log replay");
3891 ret = btrfs_replay_log(fs_info, fs_devices);
3898 fs_info->fs_root = btrfs_get_fs_root(fs_info, BTRFS_FS_TREE_OBJECTID, true);
3899 if (IS_ERR(fs_info->fs_root)) {
3900 err = PTR_ERR(fs_info->fs_root);
3901 btrfs_warn(fs_info, "failed to read fs tree: %d", err);
3902 fs_info->fs_root = NULL;
3909 ret = btrfs_start_pre_rw_mount(fs_info);
3911 close_ctree(fs_info);
3914 btrfs_discard_resume(fs_info);
3916 if (fs_info->uuid_root &&
3917 (btrfs_test_opt(fs_info, RESCAN_UUID_TREE) ||
3918 fs_info->generation != btrfs_super_uuid_tree_generation(disk_super))) {
3919 btrfs_info(fs_info, "checking UUID tree");
3920 ret = btrfs_check_uuid_tree(fs_info);
3923 "failed to check the UUID tree: %d", ret);
3924 close_ctree(fs_info);
3929 set_bit(BTRFS_FS_OPEN, &fs_info->flags);
3931 /* Kick the cleaner thread so it'll start deleting snapshots. */
3932 if (test_bit(BTRFS_FS_UNFINISHED_DROPS, &fs_info->flags))
3933 wake_up_process(fs_info->cleaner_kthread);
3936 btrfs_clear_oneshot_options(fs_info);
3940 btrfs_free_qgroup_config(fs_info);
3942 kthread_stop(fs_info->transaction_kthread);
3943 btrfs_cleanup_transaction(fs_info);
3944 btrfs_free_fs_roots(fs_info);
3946 kthread_stop(fs_info->cleaner_kthread);
3949 * make sure we're done with the btree inode before we stop our
3952 filemap_write_and_wait(fs_info->btree_inode->i_mapping);
3955 btrfs_sysfs_remove_mounted(fs_info);
3958 btrfs_sysfs_remove_fsid(fs_info->fs_devices);
3961 btrfs_put_block_group_cache(fs_info);
3964 if (fs_info->data_reloc_root)
3965 btrfs_drop_and_free_fs_root(fs_info, fs_info->data_reloc_root);
3966 free_root_pointers(fs_info, true);
3967 invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
3970 btrfs_stop_all_workers(fs_info);
3971 btrfs_free_block_groups(fs_info);
3973 btrfs_mapping_tree_free(&fs_info->mapping_tree);
3975 iput(fs_info->btree_inode);
3977 btrfs_close_devices(fs_info->fs_devices);
3980 ALLOW_ERROR_INJECTION(open_ctree, ERRNO);
3982 static void btrfs_end_super_write(struct bio *bio)
3984 struct btrfs_device *device = bio->bi_private;
3985 struct bio_vec *bvec;
3986 struct bvec_iter_all iter_all;
3989 bio_for_each_segment_all(bvec, bio, iter_all) {
3990 page = bvec->bv_page;
3992 if (bio->bi_status) {
3993 btrfs_warn_rl_in_rcu(device->fs_info,
3994 "lost page write due to IO error on %s (%d)",
3995 rcu_str_deref(device->name),
3996 blk_status_to_errno(bio->bi_status));
3997 ClearPageUptodate(page);
3999 btrfs_dev_stat_inc_and_print(device,
4000 BTRFS_DEV_STAT_WRITE_ERRS);
4002 SetPageUptodate(page);
4012 struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev,
4015 struct btrfs_super_block *super;
4017 u64 bytenr, bytenr_orig;
4018 struct address_space *mapping = bdev->bd_inode->i_mapping;
4021 bytenr_orig = btrfs_sb_offset(copy_num);
4022 ret = btrfs_sb_log_location_bdev(bdev, copy_num, READ, &bytenr);
4024 return ERR_PTR(-EINVAL);
4026 return ERR_PTR(ret);
4028 if (bytenr + BTRFS_SUPER_INFO_SIZE >= bdev_nr_bytes(bdev))
4029 return ERR_PTR(-EINVAL);
4031 page = read_cache_page_gfp(mapping, bytenr >> PAGE_SHIFT, GFP_NOFS);
4033 return ERR_CAST(page);
4035 super = page_address(page);
4036 if (btrfs_super_magic(super) != BTRFS_MAGIC) {
4037 btrfs_release_disk_super(super);
4038 return ERR_PTR(-ENODATA);
4041 if (btrfs_super_bytenr(super) != bytenr_orig) {
4042 btrfs_release_disk_super(super);
4043 return ERR_PTR(-EINVAL);
4050 struct btrfs_super_block *btrfs_read_dev_super(struct block_device *bdev)
4052 struct btrfs_super_block *super, *latest = NULL;
4056 /* we would like to check all the supers, but that would make
4057 * a btrfs mount succeed after a mkfs from a different FS.
4058 * So, we need to add a special mount option to scan for
4059 * later supers, using BTRFS_SUPER_MIRROR_MAX instead
4061 for (i = 0; i < 1; i++) {
4062 super = btrfs_read_dev_one_super(bdev, i);
4066 if (!latest || btrfs_super_generation(super) > transid) {
4068 btrfs_release_disk_super(super);
4071 transid = btrfs_super_generation(super);
4079 * Write superblock @sb to the @device. Do not wait for completion, all the
4080 * pages we use for writing are locked.
4082 * Write @max_mirrors copies of the superblock, where 0 means default that fit
4083 * the expected device size at commit time. Note that max_mirrors must be
4084 * same for write and wait phases.
4086 * Return number of errors when page is not found or submission fails.
4088 static int write_dev_supers(struct btrfs_device *device,
4089 struct btrfs_super_block *sb, int max_mirrors)
4091 struct btrfs_fs_info *fs_info = device->fs_info;
4092 struct address_space *mapping = device->bdev->bd_inode->i_mapping;
4093 SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
4097 u64 bytenr, bytenr_orig;
4099 if (max_mirrors == 0)
4100 max_mirrors = BTRFS_SUPER_MIRROR_MAX;
4102 shash->tfm = fs_info->csum_shash;
4104 for (i = 0; i < max_mirrors; i++) {
4107 struct btrfs_super_block *disk_super;
4109 bytenr_orig = btrfs_sb_offset(i);
4110 ret = btrfs_sb_log_location(device, i, WRITE, &bytenr);
4111 if (ret == -ENOENT) {
4113 } else if (ret < 0) {
4114 btrfs_err(device->fs_info,
4115 "couldn't get super block location for mirror %d",
4120 if (bytenr + BTRFS_SUPER_INFO_SIZE >=
4121 device->commit_total_bytes)
4124 btrfs_set_super_bytenr(sb, bytenr_orig);
4126 crypto_shash_digest(shash, (const char *)sb + BTRFS_CSUM_SIZE,
4127 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE,
4130 page = find_or_create_page(mapping, bytenr >> PAGE_SHIFT,
4133 btrfs_err(device->fs_info,
4134 "couldn't get super block page for bytenr %llu",
4140 /* Bump the refcount for wait_dev_supers() */
4143 disk_super = page_address(page);
4144 memcpy(disk_super, sb, BTRFS_SUPER_INFO_SIZE);
4147 * Directly use bios here instead of relying on the page cache
4148 * to do I/O, so we don't lose the ability to do integrity
4151 bio = bio_alloc(device->bdev, 1,
4152 REQ_OP_WRITE | REQ_SYNC | REQ_META | REQ_PRIO,
4154 bio->bi_iter.bi_sector = bytenr >> SECTOR_SHIFT;
4155 bio->bi_private = device;
4156 bio->bi_end_io = btrfs_end_super_write;
4157 __bio_add_page(bio, page, BTRFS_SUPER_INFO_SIZE,
4158 offset_in_page(bytenr));
4161 * We FUA only the first super block. The others we allow to
4162 * go down lazy and there's a short window where the on-disk
4163 * copies might still contain the older version.
4165 if (i == 0 && !btrfs_test_opt(device->fs_info, NOBARRIER))
4166 bio->bi_opf |= REQ_FUA;
4168 btrfsic_check_bio(bio);
4171 if (btrfs_advance_sb_log(device, i))
4174 return errors < i ? 0 : -1;
4178 * Wait for write completion of superblocks done by write_dev_supers,
4179 * @max_mirrors same for write and wait phases.
4181 * Return number of errors when page is not found or not marked up to
4184 static int wait_dev_supers(struct btrfs_device *device, int max_mirrors)
4188 bool primary_failed = false;
4192 if (max_mirrors == 0)
4193 max_mirrors = BTRFS_SUPER_MIRROR_MAX;
4195 for (i = 0; i < max_mirrors; i++) {
4198 ret = btrfs_sb_log_location(device, i, READ, &bytenr);
4199 if (ret == -ENOENT) {
4201 } else if (ret < 0) {
4204 primary_failed = true;
4207 if (bytenr + BTRFS_SUPER_INFO_SIZE >=
4208 device->commit_total_bytes)
4211 page = find_get_page(device->bdev->bd_inode->i_mapping,
4212 bytenr >> PAGE_SHIFT);
4216 primary_failed = true;
4219 /* Page is submitted locked and unlocked once the IO completes */
4220 wait_on_page_locked(page);
4221 if (PageError(page)) {
4224 primary_failed = true;
4227 /* Drop our reference */
4230 /* Drop the reference from the writing run */
4234 /* log error, force error return */
4235 if (primary_failed) {
4236 btrfs_err(device->fs_info, "error writing primary super block to device %llu",
4241 return errors < i ? 0 : -1;
4245 * endio for the write_dev_flush, this will wake anyone waiting
4246 * for the barrier when it is done
4248 static void btrfs_end_empty_barrier(struct bio *bio)
4250 complete(bio->bi_private);
4254 * Submit a flush request to the device if it supports it. Error handling is
4255 * done in the waiting counterpart.
4257 static void write_dev_flush(struct btrfs_device *device)
4259 struct bio *bio = device->flush_bio;
4261 #ifndef CONFIG_BTRFS_FS_CHECK_INTEGRITY
4263 * When a disk has write caching disabled, we skip submission of a bio
4264 * with flush and sync requests before writing the superblock, since
4265 * it's not needed. However when the integrity checker is enabled, this
4266 * results in reports that there are metadata blocks referred by a
4267 * superblock that were not properly flushed. So don't skip the bio
4268 * submission only when the integrity checker is enabled for the sake
4269 * of simplicity, since this is a debug tool and not meant for use in
4272 struct request_queue *q = bdev_get_queue(device->bdev);
4273 if (!test_bit(QUEUE_FLAG_WC, &q->queue_flags))
4277 bio_reset(bio, device->bdev, REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH);
4278 bio->bi_end_io = btrfs_end_empty_barrier;
4279 init_completion(&device->flush_wait);
4280 bio->bi_private = &device->flush_wait;
4282 btrfsic_check_bio(bio);
4284 set_bit(BTRFS_DEV_STATE_FLUSH_SENT, &device->dev_state);
4288 * If the flush bio has been submitted by write_dev_flush, wait for it.
4290 static blk_status_t wait_dev_flush(struct btrfs_device *device)
4292 struct bio *bio = device->flush_bio;
4294 if (!test_bit(BTRFS_DEV_STATE_FLUSH_SENT, &device->dev_state))
4297 clear_bit(BTRFS_DEV_STATE_FLUSH_SENT, &device->dev_state);
4298 wait_for_completion_io(&device->flush_wait);
4300 return bio->bi_status;
4303 static int check_barrier_error(struct btrfs_fs_info *fs_info)
4305 if (!btrfs_check_rw_degradable(fs_info, NULL))
4311 * send an empty flush down to each device in parallel,
4312 * then wait for them
4314 static int barrier_all_devices(struct btrfs_fs_info *info)
4316 struct list_head *head;
4317 struct btrfs_device *dev;
4318 int errors_wait = 0;
4321 lockdep_assert_held(&info->fs_devices->device_list_mutex);
4322 /* send down all the barriers */
4323 head = &info->fs_devices->devices;
4324 list_for_each_entry(dev, head, dev_list) {
4325 if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state))
4329 if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
4330 !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
4333 write_dev_flush(dev);
4334 dev->last_flush_error = BLK_STS_OK;
4337 /* wait for all the barriers */
4338 list_for_each_entry(dev, head, dev_list) {
4339 if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state))
4345 if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
4346 !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
4349 ret = wait_dev_flush(dev);
4351 dev->last_flush_error = ret;
4352 btrfs_dev_stat_inc_and_print(dev,
4353 BTRFS_DEV_STAT_FLUSH_ERRS);
4360 * At some point we need the status of all disks
4361 * to arrive at the volume status. So error checking
4362 * is being pushed to a separate loop.
4364 return check_barrier_error(info);
4369 int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags)
4372 int min_tolerated = INT_MAX;
4374 if ((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0 ||
4375 (flags & BTRFS_AVAIL_ALLOC_BIT_SINGLE))
4376 min_tolerated = min_t(int, min_tolerated,
4377 btrfs_raid_array[BTRFS_RAID_SINGLE].
4378 tolerated_failures);
4380 for (raid_type = 0; raid_type < BTRFS_NR_RAID_TYPES; raid_type++) {
4381 if (raid_type == BTRFS_RAID_SINGLE)
4383 if (!(flags & btrfs_raid_array[raid_type].bg_flag))
4385 min_tolerated = min_t(int, min_tolerated,
4386 btrfs_raid_array[raid_type].
4387 tolerated_failures);
4390 if (min_tolerated == INT_MAX) {
4391 pr_warn("BTRFS: unknown raid flag: %llu", flags);
4395 return min_tolerated;
4398 int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors)
4400 struct list_head *head;
4401 struct btrfs_device *dev;
4402 struct btrfs_super_block *sb;
4403 struct btrfs_dev_item *dev_item;
4407 int total_errors = 0;
4410 do_barriers = !btrfs_test_opt(fs_info, NOBARRIER);
4413 * max_mirrors == 0 indicates we're from commit_transaction,
4414 * not from fsync where the tree roots in fs_info have not
4415 * been consistent on disk.
4417 if (max_mirrors == 0)
4418 backup_super_roots(fs_info);
4420 sb = fs_info->super_for_commit;
4421 dev_item = &sb->dev_item;
4423 mutex_lock(&fs_info->fs_devices->device_list_mutex);
4424 head = &fs_info->fs_devices->devices;
4425 max_errors = btrfs_super_num_devices(fs_info->super_copy) - 1;
4428 ret = barrier_all_devices(fs_info);
4431 &fs_info->fs_devices->device_list_mutex);
4432 btrfs_handle_fs_error(fs_info, ret,
4433 "errors while submitting device barriers.");
4438 list_for_each_entry(dev, head, dev_list) {
4443 if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
4444 !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
4447 btrfs_set_stack_device_generation(dev_item, 0);
4448 btrfs_set_stack_device_type(dev_item, dev->type);
4449 btrfs_set_stack_device_id(dev_item, dev->devid);
4450 btrfs_set_stack_device_total_bytes(dev_item,
4451 dev->commit_total_bytes);
4452 btrfs_set_stack_device_bytes_used(dev_item,
4453 dev->commit_bytes_used);
4454 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
4455 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
4456 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
4457 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
4458 memcpy(dev_item->fsid, dev->fs_devices->metadata_uuid,
4461 flags = btrfs_super_flags(sb);
4462 btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
4464 ret = btrfs_validate_write_super(fs_info, sb);
4466 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
4467 btrfs_handle_fs_error(fs_info, -EUCLEAN,
4468 "unexpected superblock corruption detected");
4472 ret = write_dev_supers(dev, sb, max_mirrors);
4476 if (total_errors > max_errors) {
4477 btrfs_err(fs_info, "%d errors while writing supers",
4479 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
4481 /* FUA is masked off if unsupported and can't be the reason */
4482 btrfs_handle_fs_error(fs_info, -EIO,
4483 "%d errors while writing supers",
4489 list_for_each_entry(dev, head, dev_list) {
4492 if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
4493 !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
4496 ret = wait_dev_supers(dev, max_mirrors);
4500 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
4501 if (total_errors > max_errors) {
4502 btrfs_handle_fs_error(fs_info, -EIO,
4503 "%d errors while writing supers",
4510 /* Drop a fs root from the radix tree and free it. */
4511 void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
4512 struct btrfs_root *root)
4514 bool drop_ref = false;
4516 spin_lock(&fs_info->fs_roots_radix_lock);
4517 radix_tree_delete(&fs_info->fs_roots_radix,
4518 (unsigned long)root->root_key.objectid);
4519 if (test_and_clear_bit(BTRFS_ROOT_IN_RADIX, &root->state))
4521 spin_unlock(&fs_info->fs_roots_radix_lock);
4523 if (BTRFS_FS_ERROR(fs_info)) {
4524 ASSERT(root->log_root == NULL);
4525 if (root->reloc_root) {
4526 btrfs_put_root(root->reloc_root);
4527 root->reloc_root = NULL;
4532 btrfs_put_root(root);
4535 int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info)
4537 u64 root_objectid = 0;
4538 struct btrfs_root *gang[8];
4541 unsigned int ret = 0;
4544 spin_lock(&fs_info->fs_roots_radix_lock);
4545 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
4546 (void **)gang, root_objectid,
4549 spin_unlock(&fs_info->fs_roots_radix_lock);
4552 root_objectid = gang[ret - 1]->root_key.objectid + 1;
4554 for (i = 0; i < ret; i++) {
4555 /* Avoid to grab roots in dead_roots */
4556 if (btrfs_root_refs(&gang[i]->root_item) == 0) {
4560 /* grab all the search result for later use */
4561 gang[i] = btrfs_grab_root(gang[i]);
4563 spin_unlock(&fs_info->fs_roots_radix_lock);
4565 for (i = 0; i < ret; i++) {
4568 root_objectid = gang[i]->root_key.objectid;
4569 err = btrfs_orphan_cleanup(gang[i]);
4572 btrfs_put_root(gang[i]);
4577 /* release the uncleaned roots due to error */
4578 for (; i < ret; i++) {
4580 btrfs_put_root(gang[i]);
4585 int btrfs_commit_super(struct btrfs_fs_info *fs_info)
4587 struct btrfs_root *root = fs_info->tree_root;
4588 struct btrfs_trans_handle *trans;
4590 mutex_lock(&fs_info->cleaner_mutex);
4591 btrfs_run_delayed_iputs(fs_info);
4592 mutex_unlock(&fs_info->cleaner_mutex);
4593 wake_up_process(fs_info->cleaner_kthread);
4595 /* wait until ongoing cleanup work done */
4596 down_write(&fs_info->cleanup_work_sem);
4597 up_write(&fs_info->cleanup_work_sem);
4599 trans = btrfs_join_transaction(root);
4601 return PTR_ERR(trans);
4602 return btrfs_commit_transaction(trans);
4605 static void warn_about_uncommitted_trans(struct btrfs_fs_info *fs_info)
4607 struct btrfs_transaction *trans;
4608 struct btrfs_transaction *tmp;
4611 if (list_empty(&fs_info->trans_list))
4615 * This function is only called at the very end of close_ctree(),
4616 * thus no other running transaction, no need to take trans_lock.
4618 ASSERT(test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags));
4619 list_for_each_entry_safe(trans, tmp, &fs_info->trans_list, list) {
4620 struct extent_state *cached = NULL;
4621 u64 dirty_bytes = 0;
4627 while (!find_first_extent_bit(&trans->dirty_pages, cur,
4628 &found_start, &found_end, EXTENT_DIRTY, &cached)) {
4629 dirty_bytes += found_end + 1 - found_start;
4630 cur = found_end + 1;
4633 "transaction %llu (with %llu dirty metadata bytes) is not committed",
4634 trans->transid, dirty_bytes);
4635 btrfs_cleanup_one_transaction(trans, fs_info);
4637 if (trans == fs_info->running_transaction)
4638 fs_info->running_transaction = NULL;
4639 list_del_init(&trans->list);
4641 btrfs_put_transaction(trans);
4642 trace_btrfs_transaction_commit(fs_info);
4647 void __cold close_ctree(struct btrfs_fs_info *fs_info)
4651 set_bit(BTRFS_FS_CLOSING_START, &fs_info->flags);
4654 * We may have the reclaim task running and relocating a data block group,
4655 * in which case it may create delayed iputs. So stop it before we park
4656 * the cleaner kthread otherwise we can get new delayed iputs after
4657 * parking the cleaner, and that can make the async reclaim task to hang
4658 * if it's waiting for delayed iputs to complete, since the cleaner is
4659 * parked and can not run delayed iputs - this will make us hang when
4660 * trying to stop the async reclaim task.
4662 cancel_work_sync(&fs_info->reclaim_bgs_work);
4664 * We don't want the cleaner to start new transactions, add more delayed
4665 * iputs, etc. while we're closing. We can't use kthread_stop() yet
4666 * because that frees the task_struct, and the transaction kthread might
4667 * still try to wake up the cleaner.
4669 kthread_park(fs_info->cleaner_kthread);
4672 * If we had UNFINISHED_DROPS we could still be processing them, so
4673 * clear that bit and wake up relocation so it can stop.
4675 btrfs_wake_unfinished_drop(fs_info);
4677 /* wait for the qgroup rescan worker to stop */
4678 btrfs_qgroup_wait_for_completion(fs_info, false);
4680 /* wait for the uuid_scan task to finish */
4681 down(&fs_info->uuid_tree_rescan_sem);
4682 /* avoid complains from lockdep et al., set sem back to initial state */
4683 up(&fs_info->uuid_tree_rescan_sem);
4685 /* pause restriper - we want to resume on mount */
4686 btrfs_pause_balance(fs_info);
4688 btrfs_dev_replace_suspend_for_unmount(fs_info);
4690 btrfs_scrub_cancel(fs_info);
4692 /* wait for any defraggers to finish */
4693 wait_event(fs_info->transaction_wait,
4694 (atomic_read(&fs_info->defrag_running) == 0));
4696 /* clear out the rbtree of defraggable inodes */
4697 btrfs_cleanup_defrag_inodes(fs_info);
4699 cancel_work_sync(&fs_info->async_reclaim_work);
4700 cancel_work_sync(&fs_info->async_data_reclaim_work);
4701 cancel_work_sync(&fs_info->preempt_reclaim_work);
4703 /* Cancel or finish ongoing discard work */
4704 btrfs_discard_cleanup(fs_info);
4706 if (!sb_rdonly(fs_info->sb)) {
4708 * The cleaner kthread is stopped, so do one final pass over
4709 * unused block groups.
4711 btrfs_delete_unused_bgs(fs_info);
4714 * There might be existing delayed inode workers still running
4715 * and holding an empty delayed inode item. We must wait for
4716 * them to complete first because they can create a transaction.
4717 * This happens when someone calls btrfs_balance_delayed_items()
4718 * and then a transaction commit runs the same delayed nodes
4719 * before any delayed worker has done something with the nodes.
4720 * We must wait for any worker here and not at transaction
4721 * commit time since that could cause a deadlock.
4722 * This is a very rare case.
4724 btrfs_flush_workqueue(fs_info->delayed_workers);
4726 ret = btrfs_commit_super(fs_info);
4728 btrfs_err(fs_info, "commit super ret %d", ret);
4731 if (BTRFS_FS_ERROR(fs_info))
4732 btrfs_error_commit_super(fs_info);
4734 kthread_stop(fs_info->transaction_kthread);
4735 kthread_stop(fs_info->cleaner_kthread);
4737 ASSERT(list_empty(&fs_info->delayed_iputs));
4738 set_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags);
4740 if (btrfs_check_quota_leak(fs_info)) {
4741 WARN_ON(IS_ENABLED(CONFIG_BTRFS_DEBUG));
4742 btrfs_err(fs_info, "qgroup reserved space leaked");
4745 btrfs_free_qgroup_config(fs_info);
4746 ASSERT(list_empty(&fs_info->delalloc_roots));
4748 if (percpu_counter_sum(&fs_info->delalloc_bytes)) {
4749 btrfs_info(fs_info, "at unmount delalloc count %lld",
4750 percpu_counter_sum(&fs_info->delalloc_bytes));
4753 if (percpu_counter_sum(&fs_info->ordered_bytes))
4754 btrfs_info(fs_info, "at unmount dio bytes count %lld",
4755 percpu_counter_sum(&fs_info->ordered_bytes));
4757 btrfs_sysfs_remove_mounted(fs_info);
4758 btrfs_sysfs_remove_fsid(fs_info->fs_devices);
4760 btrfs_put_block_group_cache(fs_info);
4763 * we must make sure there is not any read request to
4764 * submit after we stopping all workers.
4766 invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
4767 btrfs_stop_all_workers(fs_info);
4769 /* We shouldn't have any transaction open at this point */
4770 warn_about_uncommitted_trans(fs_info);
4772 clear_bit(BTRFS_FS_OPEN, &fs_info->flags);
4773 free_root_pointers(fs_info, true);
4774 btrfs_free_fs_roots(fs_info);
4777 * We must free the block groups after dropping the fs_roots as we could
4778 * have had an IO error and have left over tree log blocks that aren't
4779 * cleaned up until the fs roots are freed. This makes the block group
4780 * accounting appear to be wrong because there's pending reserved bytes,
4781 * so make sure we do the block group cleanup afterwards.
4783 btrfs_free_block_groups(fs_info);
4785 iput(fs_info->btree_inode);
4787 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
4788 if (btrfs_test_opt(fs_info, CHECK_INTEGRITY))
4789 btrfsic_unmount(fs_info->fs_devices);
4792 btrfs_mapping_tree_free(&fs_info->mapping_tree);
4793 btrfs_close_devices(fs_info->fs_devices);
4796 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
4800 struct inode *btree_inode = buf->pages[0]->mapping->host;
4802 ret = extent_buffer_uptodate(buf);
4806 ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf,
4807 parent_transid, atomic);
4813 void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
4815 struct btrfs_fs_info *fs_info = buf->fs_info;
4816 u64 transid = btrfs_header_generation(buf);
4819 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
4821 * This is a fast path so only do this check if we have sanity tests
4822 * enabled. Normal people shouldn't be using unmapped buffers as dirty
4823 * outside of the sanity tests.
4825 if (unlikely(test_bit(EXTENT_BUFFER_UNMAPPED, &buf->bflags)))
4828 btrfs_assert_tree_write_locked(buf);
4829 if (transid != fs_info->generation)
4830 WARN(1, KERN_CRIT "btrfs transid mismatch buffer %llu, found %llu running %llu\n",
4831 buf->start, transid, fs_info->generation);
4832 was_dirty = set_extent_buffer_dirty(buf);
4834 percpu_counter_add_batch(&fs_info->dirty_metadata_bytes,
4836 fs_info->dirty_metadata_batch);
4837 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
4839 * Since btrfs_mark_buffer_dirty() can be called with item pointer set
4840 * but item data not updated.
4841 * So here we should only check item pointers, not item data.
4843 if (btrfs_header_level(buf) == 0 &&
4844 btrfs_check_leaf_relaxed(buf)) {
4845 btrfs_print_leaf(buf);
4851 static void __btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info,
4855 * looks as though older kernels can get into trouble with
4856 * this code, they end up stuck in balance_dirty_pages forever
4860 if (current->flags & PF_MEMALLOC)
4864 btrfs_balance_delayed_items(fs_info);
4866 ret = __percpu_counter_compare(&fs_info->dirty_metadata_bytes,
4867 BTRFS_DIRTY_METADATA_THRESH,
4868 fs_info->dirty_metadata_batch);
4870 balance_dirty_pages_ratelimited(fs_info->btree_inode->i_mapping);
4874 void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info)
4876 __btrfs_btree_balance_dirty(fs_info, 1);
4879 void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info)
4881 __btrfs_btree_balance_dirty(fs_info, 0);
4884 static void btrfs_error_commit_super(struct btrfs_fs_info *fs_info)
4886 /* cleanup FS via transaction */
4887 btrfs_cleanup_transaction(fs_info);
4889 mutex_lock(&fs_info->cleaner_mutex);
4890 btrfs_run_delayed_iputs(fs_info);
4891 mutex_unlock(&fs_info->cleaner_mutex);
4893 down_write(&fs_info->cleanup_work_sem);
4894 up_write(&fs_info->cleanup_work_sem);
4897 static void btrfs_drop_all_logs(struct btrfs_fs_info *fs_info)
4899 struct btrfs_root *gang[8];
4900 u64 root_objectid = 0;
4903 spin_lock(&fs_info->fs_roots_radix_lock);
4904 while ((ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
4905 (void **)gang, root_objectid,
4906 ARRAY_SIZE(gang))) != 0) {
4909 for (i = 0; i < ret; i++)
4910 gang[i] = btrfs_grab_root(gang[i]);
4911 spin_unlock(&fs_info->fs_roots_radix_lock);
4913 for (i = 0; i < ret; i++) {
4916 root_objectid = gang[i]->root_key.objectid;
4917 btrfs_free_log(NULL, gang[i]);
4918 btrfs_put_root(gang[i]);
4921 spin_lock(&fs_info->fs_roots_radix_lock);
4923 spin_unlock(&fs_info->fs_roots_radix_lock);
4924 btrfs_free_log_root_tree(NULL, fs_info);
4927 static void btrfs_destroy_ordered_extents(struct btrfs_root *root)
4929 struct btrfs_ordered_extent *ordered;
4931 spin_lock(&root->ordered_extent_lock);
4933 * This will just short circuit the ordered completion stuff which will
4934 * make sure the ordered extent gets properly cleaned up.
4936 list_for_each_entry(ordered, &root->ordered_extents,
4938 set_bit(BTRFS_ORDERED_IOERR, &ordered->flags);
4939 spin_unlock(&root->ordered_extent_lock);
4942 static void btrfs_destroy_all_ordered_extents(struct btrfs_fs_info *fs_info)
4944 struct btrfs_root *root;
4945 struct list_head splice;
4947 INIT_LIST_HEAD(&splice);
4949 spin_lock(&fs_info->ordered_root_lock);
4950 list_splice_init(&fs_info->ordered_roots, &splice);
4951 while (!list_empty(&splice)) {
4952 root = list_first_entry(&splice, struct btrfs_root,
4954 list_move_tail(&root->ordered_root,
4955 &fs_info->ordered_roots);
4957 spin_unlock(&fs_info->ordered_root_lock);
4958 btrfs_destroy_ordered_extents(root);
4961 spin_lock(&fs_info->ordered_root_lock);
4963 spin_unlock(&fs_info->ordered_root_lock);
4966 * We need this here because if we've been flipped read-only we won't
4967 * get sync() from the umount, so we need to make sure any ordered
4968 * extents that haven't had their dirty pages IO start writeout yet
4969 * actually get run and error out properly.
4971 btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1);
4974 static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
4975 struct btrfs_fs_info *fs_info)
4977 struct rb_node *node;
4978 struct btrfs_delayed_ref_root *delayed_refs;
4979 struct btrfs_delayed_ref_node *ref;
4982 delayed_refs = &trans->delayed_refs;
4984 spin_lock(&delayed_refs->lock);
4985 if (atomic_read(&delayed_refs->num_entries) == 0) {
4986 spin_unlock(&delayed_refs->lock);
4987 btrfs_debug(fs_info, "delayed_refs has NO entry");
4991 while ((node = rb_first_cached(&delayed_refs->href_root)) != NULL) {
4992 struct btrfs_delayed_ref_head *head;
4994 bool pin_bytes = false;
4996 head = rb_entry(node, struct btrfs_delayed_ref_head,
4998 if (btrfs_delayed_ref_lock(delayed_refs, head))
5001 spin_lock(&head->lock);
5002 while ((n = rb_first_cached(&head->ref_tree)) != NULL) {
5003 ref = rb_entry(n, struct btrfs_delayed_ref_node,
5006 rb_erase_cached(&ref->ref_node, &head->ref_tree);
5007 RB_CLEAR_NODE(&ref->ref_node);
5008 if (!list_empty(&ref->add_list))
5009 list_del(&ref->add_list);
5010 atomic_dec(&delayed_refs->num_entries);
5011 btrfs_put_delayed_ref(ref);
5013 if (head->must_insert_reserved)
5015 btrfs_free_delayed_extent_op(head->extent_op);
5016 btrfs_delete_ref_head(delayed_refs, head);
5017 spin_unlock(&head->lock);
5018 spin_unlock(&delayed_refs->lock);
5019 mutex_unlock(&head->mutex);
5022 struct btrfs_block_group *cache;
5024 cache = btrfs_lookup_block_group(fs_info, head->bytenr);
5027 spin_lock(&cache->space_info->lock);
5028 spin_lock(&cache->lock);
5029 cache->pinned += head->num_bytes;
5030 btrfs_space_info_update_bytes_pinned(fs_info,
5031 cache->space_info, head->num_bytes);
5032 cache->reserved -= head->num_bytes;
5033 cache->space_info->bytes_reserved -= head->num_bytes;
5034 spin_unlock(&cache->lock);
5035 spin_unlock(&cache->space_info->lock);
5037 btrfs_put_block_group(cache);
5039 btrfs_error_unpin_extent_range(fs_info, head->bytenr,
5040 head->bytenr + head->num_bytes - 1);
5042 btrfs_cleanup_ref_head_accounting(fs_info, delayed_refs, head);
5043 btrfs_put_delayed_ref_head(head);
5045 spin_lock(&delayed_refs->lock);
5047 btrfs_qgroup_destroy_extent_records(trans);
5049 spin_unlock(&delayed_refs->lock);
5054 static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root)
5056 struct btrfs_inode *btrfs_inode;
5057 struct list_head splice;
5059 INIT_LIST_HEAD(&splice);
5061 spin_lock(&root->delalloc_lock);
5062 list_splice_init(&root->delalloc_inodes, &splice);
5064 while (!list_empty(&splice)) {
5065 struct inode *inode = NULL;
5066 btrfs_inode = list_first_entry(&splice, struct btrfs_inode,
5068 __btrfs_del_delalloc_inode(root, btrfs_inode);
5069 spin_unlock(&root->delalloc_lock);
5072 * Make sure we get a live inode and that it'll not disappear
5075 inode = igrab(&btrfs_inode->vfs_inode);
5077 invalidate_inode_pages2(inode->i_mapping);
5080 spin_lock(&root->delalloc_lock);
5082 spin_unlock(&root->delalloc_lock);
5085 static void btrfs_destroy_all_delalloc_inodes(struct btrfs_fs_info *fs_info)
5087 struct btrfs_root *root;
5088 struct list_head splice;
5090 INIT_LIST_HEAD(&splice);
5092 spin_lock(&fs_info->delalloc_root_lock);
5093 list_splice_init(&fs_info->delalloc_roots, &splice);
5094 while (!list_empty(&splice)) {
5095 root = list_first_entry(&splice, struct btrfs_root,
5097 root = btrfs_grab_root(root);
5099 spin_unlock(&fs_info->delalloc_root_lock);
5101 btrfs_destroy_delalloc_inodes(root);
5102 btrfs_put_root(root);
5104 spin_lock(&fs_info->delalloc_root_lock);
5106 spin_unlock(&fs_info->delalloc_root_lock);
5109 static int btrfs_destroy_marked_extents(struct btrfs_fs_info *fs_info,
5110 struct extent_io_tree *dirty_pages,
5114 struct extent_buffer *eb;
5119 ret = find_first_extent_bit(dirty_pages, start, &start, &end,
5124 clear_extent_bits(dirty_pages, start, end, mark);
5125 while (start <= end) {
5126 eb = find_extent_buffer(fs_info, start);
5127 start += fs_info->nodesize;
5130 wait_on_extent_buffer_writeback(eb);
5132 if (test_and_clear_bit(EXTENT_BUFFER_DIRTY,
5134 clear_extent_buffer_dirty(eb);
5135 free_extent_buffer_stale(eb);
5142 static int btrfs_destroy_pinned_extent(struct btrfs_fs_info *fs_info,
5143 struct extent_io_tree *unpin)
5150 struct extent_state *cached_state = NULL;
5153 * The btrfs_finish_extent_commit() may get the same range as
5154 * ours between find_first_extent_bit and clear_extent_dirty.
5155 * Hence, hold the unused_bg_unpin_mutex to avoid double unpin
5156 * the same extent range.
5158 mutex_lock(&fs_info->unused_bg_unpin_mutex);
5159 ret = find_first_extent_bit(unpin, 0, &start, &end,
5160 EXTENT_DIRTY, &cached_state);
5162 mutex_unlock(&fs_info->unused_bg_unpin_mutex);
5166 clear_extent_dirty(unpin, start, end, &cached_state);
5167 free_extent_state(cached_state);
5168 btrfs_error_unpin_extent_range(fs_info, start, end);
5169 mutex_unlock(&fs_info->unused_bg_unpin_mutex);
5176 static void btrfs_cleanup_bg_io(struct btrfs_block_group *cache)
5178 struct inode *inode;
5180 inode = cache->io_ctl.inode;
5182 invalidate_inode_pages2(inode->i_mapping);
5183 BTRFS_I(inode)->generation = 0;
5184 cache->io_ctl.inode = NULL;
5187 ASSERT(cache->io_ctl.pages == NULL);
5188 btrfs_put_block_group(cache);
5191 void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *cur_trans,
5192 struct btrfs_fs_info *fs_info)
5194 struct btrfs_block_group *cache;
5196 spin_lock(&cur_trans->dirty_bgs_lock);
5197 while (!list_empty(&cur_trans->dirty_bgs)) {
5198 cache = list_first_entry(&cur_trans->dirty_bgs,
5199 struct btrfs_block_group,
5202 if (!list_empty(&cache->io_list)) {
5203 spin_unlock(&cur_trans->dirty_bgs_lock);
5204 list_del_init(&cache->io_list);
5205 btrfs_cleanup_bg_io(cache);
5206 spin_lock(&cur_trans->dirty_bgs_lock);
5209 list_del_init(&cache->dirty_list);
5210 spin_lock(&cache->lock);
5211 cache->disk_cache_state = BTRFS_DC_ERROR;
5212 spin_unlock(&cache->lock);
5214 spin_unlock(&cur_trans->dirty_bgs_lock);
5215 btrfs_put_block_group(cache);
5216 btrfs_delayed_refs_rsv_release(fs_info, 1);
5217 spin_lock(&cur_trans->dirty_bgs_lock);
5219 spin_unlock(&cur_trans->dirty_bgs_lock);
5222 * Refer to the definition of io_bgs member for details why it's safe
5223 * to use it without any locking
5225 while (!list_empty(&cur_trans->io_bgs)) {
5226 cache = list_first_entry(&cur_trans->io_bgs,
5227 struct btrfs_block_group,
5230 list_del_init(&cache->io_list);
5231 spin_lock(&cache->lock);
5232 cache->disk_cache_state = BTRFS_DC_ERROR;
5233 spin_unlock(&cache->lock);
5234 btrfs_cleanup_bg_io(cache);
5238 void btrfs_cleanup_one_transaction(struct btrfs_transaction *cur_trans,
5239 struct btrfs_fs_info *fs_info)
5241 struct btrfs_device *dev, *tmp;
5243 btrfs_cleanup_dirty_bgs(cur_trans, fs_info);
5244 ASSERT(list_empty(&cur_trans->dirty_bgs));
5245 ASSERT(list_empty(&cur_trans->io_bgs));
5247 list_for_each_entry_safe(dev, tmp, &cur_trans->dev_update_list,
5249 list_del_init(&dev->post_commit_list);
5252 btrfs_destroy_delayed_refs(cur_trans, fs_info);
5254 cur_trans->state = TRANS_STATE_COMMIT_START;
5255 wake_up(&fs_info->transaction_blocked_wait);
5257 cur_trans->state = TRANS_STATE_UNBLOCKED;
5258 wake_up(&fs_info->transaction_wait);
5260 btrfs_destroy_delayed_inodes(fs_info);
5262 btrfs_destroy_marked_extents(fs_info, &cur_trans->dirty_pages,
5264 btrfs_destroy_pinned_extent(fs_info, &cur_trans->pinned_extents);
5266 btrfs_free_redirty_list(cur_trans);
5268 cur_trans->state =TRANS_STATE_COMPLETED;
5269 wake_up(&cur_trans->commit_wait);
5272 static int btrfs_cleanup_transaction(struct btrfs_fs_info *fs_info)
5274 struct btrfs_transaction *t;
5276 mutex_lock(&fs_info->transaction_kthread_mutex);
5278 spin_lock(&fs_info->trans_lock);
5279 while (!list_empty(&fs_info->trans_list)) {
5280 t = list_first_entry(&fs_info->trans_list,
5281 struct btrfs_transaction, list);
5282 if (t->state >= TRANS_STATE_COMMIT_START) {
5283 refcount_inc(&t->use_count);
5284 spin_unlock(&fs_info->trans_lock);
5285 btrfs_wait_for_commit(fs_info, t->transid);
5286 btrfs_put_transaction(t);
5287 spin_lock(&fs_info->trans_lock);
5290 if (t == fs_info->running_transaction) {
5291 t->state = TRANS_STATE_COMMIT_DOING;
5292 spin_unlock(&fs_info->trans_lock);
5294 * We wait for 0 num_writers since we don't hold a trans
5295 * handle open currently for this transaction.
5297 wait_event(t->writer_wait,
5298 atomic_read(&t->num_writers) == 0);
5300 spin_unlock(&fs_info->trans_lock);
5302 btrfs_cleanup_one_transaction(t, fs_info);
5304 spin_lock(&fs_info->trans_lock);
5305 if (t == fs_info->running_transaction)
5306 fs_info->running_transaction = NULL;
5307 list_del_init(&t->list);
5308 spin_unlock(&fs_info->trans_lock);
5310 btrfs_put_transaction(t);
5311 trace_btrfs_transaction_commit(fs_info);
5312 spin_lock(&fs_info->trans_lock);
5314 spin_unlock(&fs_info->trans_lock);
5315 btrfs_destroy_all_ordered_extents(fs_info);
5316 btrfs_destroy_delayed_inodes(fs_info);
5317 btrfs_assert_delayed_root_empty(fs_info);
5318 btrfs_destroy_all_delalloc_inodes(fs_info);
5319 btrfs_drop_all_logs(fs_info);
5320 mutex_unlock(&fs_info->transaction_kthread_mutex);
5325 int btrfs_init_root_free_objectid(struct btrfs_root *root)
5327 struct btrfs_path *path;
5329 struct extent_buffer *l;
5330 struct btrfs_key search_key;
5331 struct btrfs_key found_key;
5334 path = btrfs_alloc_path();
5338 search_key.objectid = BTRFS_LAST_FREE_OBJECTID;
5339 search_key.type = -1;
5340 search_key.offset = (u64)-1;
5341 ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0);
5344 BUG_ON(ret == 0); /* Corruption */
5345 if (path->slots[0] > 0) {
5346 slot = path->slots[0] - 1;
5348 btrfs_item_key_to_cpu(l, &found_key, slot);
5349 root->free_objectid = max_t(u64, found_key.objectid + 1,
5350 BTRFS_FIRST_FREE_OBJECTID);
5352 root->free_objectid = BTRFS_FIRST_FREE_OBJECTID;
5356 btrfs_free_path(path);
5360 int btrfs_get_free_objectid(struct btrfs_root *root, u64 *objectid)
5363 mutex_lock(&root->objectid_mutex);
5365 if (unlikely(root->free_objectid >= BTRFS_LAST_FREE_OBJECTID)) {
5366 btrfs_warn(root->fs_info,
5367 "the objectid of root %llu reaches its highest value",
5368 root->root_key.objectid);
5373 *objectid = root->free_objectid++;
5376 mutex_unlock(&root->objectid_mutex);