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 btrfs_destroy_ordered_extents(struct btrfs_root *root);
55 static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
56 struct btrfs_fs_info *fs_info);
57 static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root);
58 static int btrfs_destroy_marked_extents(struct btrfs_fs_info *fs_info,
59 struct extent_io_tree *dirty_pages,
61 static int btrfs_destroy_pinned_extent(struct btrfs_fs_info *fs_info,
62 struct extent_io_tree *pinned_extents);
63 static int btrfs_cleanup_transaction(struct btrfs_fs_info *fs_info);
64 static void btrfs_error_commit_super(struct btrfs_fs_info *fs_info);
66 static void btrfs_free_csum_hash(struct btrfs_fs_info *fs_info)
68 if (fs_info->csum_shash)
69 crypto_free_shash(fs_info->csum_shash);
73 * async submit bios are used to offload expensive checksumming
74 * onto the worker threads. They checksum file and metadata bios
75 * just before they are sent down the IO stack.
77 struct async_submit_bio {
80 extent_submit_bio_start_t *submit_bio_start;
83 /* Optional parameter for submit_bio_start used by direct io */
85 struct btrfs_work work;
90 * Compute the csum of a btree block and store the result to provided buffer.
92 static void csum_tree_block(struct extent_buffer *buf, u8 *result)
94 struct btrfs_fs_info *fs_info = buf->fs_info;
95 const int num_pages = num_extent_pages(buf);
96 const int first_page_part = min_t(u32, PAGE_SIZE, fs_info->nodesize);
97 SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
101 shash->tfm = fs_info->csum_shash;
102 crypto_shash_init(shash);
103 kaddr = page_address(buf->pages[0]) + offset_in_page(buf->start);
104 crypto_shash_update(shash, kaddr + BTRFS_CSUM_SIZE,
105 first_page_part - BTRFS_CSUM_SIZE);
107 for (i = 1; i < num_pages; i++) {
108 kaddr = page_address(buf->pages[i]);
109 crypto_shash_update(shash, kaddr, PAGE_SIZE);
111 memset(result, 0, BTRFS_CSUM_SIZE);
112 crypto_shash_final(shash, result);
116 * we can't consider a given block up to date unless the transid of the
117 * block matches the transid in the parent node's pointer. This is how we
118 * detect blocks that either didn't get written at all or got written
119 * in the wrong place.
121 static int verify_parent_transid(struct extent_io_tree *io_tree,
122 struct extent_buffer *eb, u64 parent_transid,
125 struct extent_state *cached_state = NULL;
128 if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
134 lock_extent_bits(io_tree, eb->start, eb->start + eb->len - 1,
136 if (extent_buffer_uptodate(eb) &&
137 btrfs_header_generation(eb) == parent_transid) {
141 btrfs_err_rl(eb->fs_info,
142 "parent transid verify failed on logical %llu mirror %u wanted %llu found %llu",
143 eb->start, eb->read_mirror,
144 parent_transid, btrfs_header_generation(eb));
146 clear_extent_buffer_uptodate(eb);
148 unlock_extent_cached(io_tree, eb->start, eb->start + eb->len - 1,
153 static bool btrfs_supported_super_csum(u16 csum_type)
156 case BTRFS_CSUM_TYPE_CRC32:
157 case BTRFS_CSUM_TYPE_XXHASH:
158 case BTRFS_CSUM_TYPE_SHA256:
159 case BTRFS_CSUM_TYPE_BLAKE2:
167 * Return 0 if the superblock checksum type matches the checksum value of that
168 * algorithm. Pass the raw disk superblock data.
170 static int btrfs_check_super_csum(struct btrfs_fs_info *fs_info,
173 struct btrfs_super_block *disk_sb =
174 (struct btrfs_super_block *)raw_disk_sb;
175 char result[BTRFS_CSUM_SIZE];
176 SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
178 shash->tfm = fs_info->csum_shash;
181 * The super_block structure does not span the whole
182 * BTRFS_SUPER_INFO_SIZE range, we expect that the unused space is
183 * filled with zeros and is included in the checksum.
185 crypto_shash_digest(shash, raw_disk_sb + BTRFS_CSUM_SIZE,
186 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE, result);
188 if (memcmp(disk_sb->csum, result, fs_info->csum_size))
194 int btrfs_verify_level_key(struct extent_buffer *eb, int level,
195 struct btrfs_key *first_key, u64 parent_transid)
197 struct btrfs_fs_info *fs_info = eb->fs_info;
199 struct btrfs_key found_key;
202 found_level = btrfs_header_level(eb);
203 if (found_level != level) {
204 WARN(IS_ENABLED(CONFIG_BTRFS_DEBUG),
205 KERN_ERR "BTRFS: tree level check failed\n");
207 "tree level mismatch detected, bytenr=%llu level expected=%u has=%u",
208 eb->start, level, found_level);
216 * For live tree block (new tree blocks in current transaction),
217 * we need proper lock context to avoid race, which is impossible here.
218 * So we only checks tree blocks which is read from disk, whose
219 * generation <= fs_info->last_trans_committed.
221 if (btrfs_header_generation(eb) > fs_info->last_trans_committed)
224 /* We have @first_key, so this @eb must have at least one item */
225 if (btrfs_header_nritems(eb) == 0) {
227 "invalid tree nritems, bytenr=%llu nritems=0 expect >0",
229 WARN_ON(IS_ENABLED(CONFIG_BTRFS_DEBUG));
234 btrfs_node_key_to_cpu(eb, &found_key, 0);
236 btrfs_item_key_to_cpu(eb, &found_key, 0);
237 ret = btrfs_comp_cpu_keys(first_key, &found_key);
240 WARN(IS_ENABLED(CONFIG_BTRFS_DEBUG),
241 KERN_ERR "BTRFS: tree first key check failed\n");
243 "tree first key mismatch detected, bytenr=%llu parent_transid=%llu key expected=(%llu,%u,%llu) has=(%llu,%u,%llu)",
244 eb->start, parent_transid, first_key->objectid,
245 first_key->type, first_key->offset,
246 found_key.objectid, found_key.type,
253 * helper to read a given tree block, doing retries as required when
254 * the checksums don't match and we have alternate mirrors to try.
256 * @parent_transid: expected transid, skip check if 0
257 * @level: expected level, mandatory check
258 * @first_key: expected key of first slot, skip check if NULL
260 int btrfs_read_extent_buffer(struct extent_buffer *eb,
261 u64 parent_transid, int level,
262 struct btrfs_key *first_key)
264 struct btrfs_fs_info *fs_info = eb->fs_info;
265 struct extent_io_tree *io_tree;
270 int failed_mirror = 0;
272 io_tree = &BTRFS_I(fs_info->btree_inode)->io_tree;
274 clear_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags);
275 ret = read_extent_buffer_pages(eb, WAIT_COMPLETE, mirror_num);
277 if (verify_parent_transid(io_tree, eb,
280 else if (btrfs_verify_level_key(eb, level,
281 first_key, parent_transid))
287 num_copies = btrfs_num_copies(fs_info,
292 if (!failed_mirror) {
294 failed_mirror = eb->read_mirror;
298 if (mirror_num == failed_mirror)
301 if (mirror_num > num_copies)
305 if (failed && !ret && failed_mirror)
306 btrfs_repair_eb_io_failure(eb, failed_mirror);
311 static int csum_one_extent_buffer(struct extent_buffer *eb)
313 struct btrfs_fs_info *fs_info = eb->fs_info;
314 u8 result[BTRFS_CSUM_SIZE];
317 ASSERT(memcmp_extent_buffer(eb, fs_info->fs_devices->metadata_uuid,
318 offsetof(struct btrfs_header, fsid),
319 BTRFS_FSID_SIZE) == 0);
320 csum_tree_block(eb, result);
322 if (btrfs_header_level(eb))
323 ret = btrfs_check_node(eb);
325 ret = btrfs_check_leaf_full(eb);
331 * Also check the generation, the eb reached here must be newer than
332 * last committed. Or something seriously wrong happened.
334 if (unlikely(btrfs_header_generation(eb) <= fs_info->last_trans_committed)) {
337 "block=%llu bad generation, have %llu expect > %llu",
338 eb->start, btrfs_header_generation(eb),
339 fs_info->last_trans_committed);
342 write_extent_buffer(eb, result, 0, fs_info->csum_size);
347 btrfs_print_tree(eb, 0);
348 btrfs_err(fs_info, "block=%llu write time tree block corruption detected",
350 WARN_ON(IS_ENABLED(CONFIG_BTRFS_DEBUG));
354 /* Checksum all dirty extent buffers in one bio_vec */
355 static int csum_dirty_subpage_buffers(struct btrfs_fs_info *fs_info,
356 struct bio_vec *bvec)
358 struct page *page = bvec->bv_page;
359 u64 bvec_start = page_offset(page) + bvec->bv_offset;
363 for (cur = bvec_start; cur < bvec_start + bvec->bv_len;
364 cur += fs_info->nodesize) {
365 struct extent_buffer *eb;
368 eb = find_extent_buffer(fs_info, cur);
369 uptodate = btrfs_subpage_test_uptodate(fs_info, page, cur,
372 /* A dirty eb shouldn't disappear from buffer_radix */
376 if (WARN_ON(cur != btrfs_header_bytenr(eb))) {
377 free_extent_buffer(eb);
380 if (WARN_ON(!uptodate)) {
381 free_extent_buffer(eb);
385 ret = csum_one_extent_buffer(eb);
386 free_extent_buffer(eb);
394 * Checksum a dirty tree block before IO. This has extra checks to make sure
395 * we only fill in the checksum field in the first page of a multi-page block.
396 * For subpage extent buffers we need bvec to also read the offset in the page.
398 static int csum_dirty_buffer(struct btrfs_fs_info *fs_info, struct bio_vec *bvec)
400 struct page *page = bvec->bv_page;
401 u64 start = page_offset(page);
403 struct extent_buffer *eb;
405 if (fs_info->nodesize < PAGE_SIZE)
406 return csum_dirty_subpage_buffers(fs_info, bvec);
408 eb = (struct extent_buffer *)page->private;
409 if (page != eb->pages[0])
412 found_start = btrfs_header_bytenr(eb);
414 if (test_bit(EXTENT_BUFFER_NO_CHECK, &eb->bflags)) {
415 WARN_ON(found_start != 0);
420 * Please do not consolidate these warnings into a single if.
421 * It is useful to know what went wrong.
423 if (WARN_ON(found_start != start))
425 if (WARN_ON(!PageUptodate(page)))
428 return csum_one_extent_buffer(eb);
431 static int check_tree_block_fsid(struct extent_buffer *eb)
433 struct btrfs_fs_info *fs_info = eb->fs_info;
434 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices, *seed_devs;
435 u8 fsid[BTRFS_FSID_SIZE];
438 read_extent_buffer(eb, fsid, offsetof(struct btrfs_header, fsid),
441 * Checking the incompat flag is only valid for the current fs. For
442 * seed devices it's forbidden to have their uuid changed so reading
443 * ->fsid in this case is fine
445 if (btrfs_fs_incompat(fs_info, METADATA_UUID))
446 metadata_uuid = fs_devices->metadata_uuid;
448 metadata_uuid = fs_devices->fsid;
450 if (!memcmp(fsid, metadata_uuid, BTRFS_FSID_SIZE))
453 list_for_each_entry(seed_devs, &fs_devices->seed_list, seed_list)
454 if (!memcmp(fsid, seed_devs->fsid, BTRFS_FSID_SIZE))
460 /* Do basic extent buffer checks at read time */
461 static int validate_extent_buffer(struct extent_buffer *eb)
463 struct btrfs_fs_info *fs_info = eb->fs_info;
465 const u32 csum_size = fs_info->csum_size;
467 u8 result[BTRFS_CSUM_SIZE];
468 const u8 *header_csum;
471 found_start = btrfs_header_bytenr(eb);
472 if (found_start != eb->start) {
473 btrfs_err_rl(fs_info,
474 "bad tree block start, mirror %u want %llu have %llu",
475 eb->read_mirror, eb->start, found_start);
479 if (check_tree_block_fsid(eb)) {
480 btrfs_err_rl(fs_info, "bad fsid on logical %llu mirror %u",
481 eb->start, eb->read_mirror);
485 found_level = btrfs_header_level(eb);
486 if (found_level >= BTRFS_MAX_LEVEL) {
488 "bad tree block level, mirror %u level %d on logical %llu",
489 eb->read_mirror, btrfs_header_level(eb), eb->start);
494 csum_tree_block(eb, result);
495 header_csum = page_address(eb->pages[0]) +
496 get_eb_offset_in_page(eb, offsetof(struct btrfs_header, csum));
498 if (memcmp(result, header_csum, csum_size) != 0) {
499 btrfs_warn_rl(fs_info,
500 "checksum verify failed on logical %llu mirror %u wanted " CSUM_FMT " found " CSUM_FMT " level %d",
501 eb->start, eb->read_mirror,
502 CSUM_FMT_VALUE(csum_size, header_csum),
503 CSUM_FMT_VALUE(csum_size, result),
504 btrfs_header_level(eb));
510 * If this is a leaf block and it is corrupt, set the corrupt bit so
511 * that we don't try and read the other copies of this block, just
514 if (found_level == 0 && btrfs_check_leaf_full(eb)) {
515 set_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags);
519 if (found_level > 0 && btrfs_check_node(eb))
523 set_extent_buffer_uptodate(eb);
526 "read time tree block corruption detected on logical %llu mirror %u",
527 eb->start, eb->read_mirror);
532 static int validate_subpage_buffer(struct page *page, u64 start, u64 end,
535 struct btrfs_fs_info *fs_info = btrfs_sb(page->mapping->host->i_sb);
536 struct extent_buffer *eb;
541 * We don't allow bio merge for subpage metadata read, so we should
542 * only get one eb for each endio hook.
544 ASSERT(end == start + fs_info->nodesize - 1);
545 ASSERT(PagePrivate(page));
547 eb = find_extent_buffer(fs_info, start);
549 * When we are reading one tree block, eb must have been inserted into
550 * the radix tree. If not, something is wrong.
554 reads_done = atomic_dec_and_test(&eb->io_pages);
555 /* Subpage read must finish in page read */
558 eb->read_mirror = mirror;
559 if (test_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags)) {
563 ret = validate_extent_buffer(eb);
567 set_extent_buffer_uptodate(eb);
569 free_extent_buffer(eb);
573 * end_bio_extent_readpage decrements io_pages in case of error,
574 * make sure it has something to decrement.
576 atomic_inc(&eb->io_pages);
577 clear_extent_buffer_uptodate(eb);
578 free_extent_buffer(eb);
582 int btrfs_validate_metadata_buffer(struct btrfs_bio *bbio,
583 struct page *page, u64 start, u64 end,
586 struct extent_buffer *eb;
590 ASSERT(page->private);
592 if (btrfs_sb(page->mapping->host->i_sb)->nodesize < PAGE_SIZE)
593 return validate_subpage_buffer(page, start, end, mirror);
595 eb = (struct extent_buffer *)page->private;
598 * The pending IO might have been the only thing that kept this buffer
599 * in memory. Make sure we have a ref for all this other checks
601 atomic_inc(&eb->refs);
603 reads_done = atomic_dec_and_test(&eb->io_pages);
607 eb->read_mirror = mirror;
608 if (test_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags)) {
612 ret = validate_extent_buffer(eb);
616 * our io error hook is going to dec the io pages
617 * again, we have to make sure it has something
620 atomic_inc(&eb->io_pages);
621 clear_extent_buffer_uptodate(eb);
623 free_extent_buffer(eb);
628 static void run_one_async_start(struct btrfs_work *work)
630 struct async_submit_bio *async;
633 async = container_of(work, struct async_submit_bio, work);
634 ret = async->submit_bio_start(async->inode, async->bio,
635 async->dio_file_offset);
641 * In order to insert checksums into the metadata in large chunks, we wait
642 * until bio submission time. All the pages in the bio are checksummed and
643 * sums are attached onto the ordered extent record.
645 * At IO completion time the csums attached on the ordered extent record are
646 * inserted into the tree.
648 static void run_one_async_done(struct btrfs_work *work)
650 struct async_submit_bio *async;
653 async = container_of(work, struct async_submit_bio, work);
654 inode = async->inode;
656 /* If an error occurred we just want to clean up the bio and move on */
658 async->bio->bi_status = async->status;
659 bio_endio(async->bio);
664 * All of the bios that pass through here are from async helpers.
665 * Use REQ_CGROUP_PUNT to issue them from the owning cgroup's context.
666 * This changes nothing when cgroups aren't in use.
668 async->bio->bi_opf |= REQ_CGROUP_PUNT;
669 btrfs_submit_bio(btrfs_sb(inode->i_sb), async->bio, async->mirror_num);
672 static void run_one_async_free(struct btrfs_work *work)
674 struct async_submit_bio *async;
676 async = container_of(work, struct async_submit_bio, work);
681 * Submit bio to an async queue.
684 * - true if the work has been succesfuly submitted
685 * - false in case of error
687 bool btrfs_wq_submit_bio(struct inode *inode, struct bio *bio, int mirror_num,
689 extent_submit_bio_start_t *submit_bio_start)
691 struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info;
692 struct async_submit_bio *async;
694 async = kmalloc(sizeof(*async), GFP_NOFS);
698 async->inode = inode;
700 async->mirror_num = mirror_num;
701 async->submit_bio_start = submit_bio_start;
703 btrfs_init_work(&async->work, run_one_async_start, run_one_async_done,
706 async->dio_file_offset = dio_file_offset;
710 if (op_is_sync(bio->bi_opf))
711 btrfs_queue_work(fs_info->hipri_workers, &async->work);
713 btrfs_queue_work(fs_info->workers, &async->work);
717 static blk_status_t btree_csum_one_bio(struct bio *bio)
719 struct bio_vec *bvec;
720 struct btrfs_root *root;
722 struct bvec_iter_all iter_all;
724 ASSERT(!bio_flagged(bio, BIO_CLONED));
725 bio_for_each_segment_all(bvec, bio, iter_all) {
726 root = BTRFS_I(bvec->bv_page->mapping->host)->root;
727 ret = csum_dirty_buffer(root->fs_info, bvec);
732 return errno_to_blk_status(ret);
735 static blk_status_t btree_submit_bio_start(struct inode *inode, struct bio *bio,
739 * when we're called for a write, we're already in the async
740 * submission context. Just jump into btrfs_submit_bio.
742 return btree_csum_one_bio(bio);
745 static bool should_async_write(struct btrfs_fs_info *fs_info,
746 struct btrfs_inode *bi)
748 if (btrfs_is_zoned(fs_info))
750 if (atomic_read(&bi->sync_writers))
752 if (test_bit(BTRFS_FS_CSUM_IMPL_FAST, &fs_info->flags))
757 void btrfs_submit_metadata_bio(struct inode *inode, struct bio *bio, int mirror_num)
759 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
762 bio->bi_opf |= REQ_META;
764 if (btrfs_op(bio) != BTRFS_MAP_WRITE) {
765 btrfs_submit_bio(fs_info, bio, mirror_num);
770 * Kthread helpers are used to submit writes so that checksumming can
771 * happen in parallel across all CPUs.
773 if (should_async_write(fs_info, BTRFS_I(inode)) &&
774 btrfs_wq_submit_bio(inode, bio, mirror_num, 0, btree_submit_bio_start))
777 ret = btree_csum_one_bio(bio);
779 bio->bi_status = ret;
784 btrfs_submit_bio(fs_info, bio, mirror_num);
787 #ifdef CONFIG_MIGRATION
788 static int btree_migrate_folio(struct address_space *mapping,
789 struct folio *dst, struct folio *src, enum migrate_mode mode)
792 * we can't safely write a btree page from here,
793 * we haven't done the locking hook
795 if (folio_test_dirty(src))
798 * Buffers may be managed in a filesystem specific way.
799 * We must have no buffers or drop them.
801 if (folio_get_private(src) &&
802 !filemap_release_folio(src, GFP_KERNEL))
804 return migrate_folio(mapping, dst, src, mode);
807 #define btree_migrate_folio NULL
810 static int btree_writepages(struct address_space *mapping,
811 struct writeback_control *wbc)
813 struct btrfs_fs_info *fs_info;
816 if (wbc->sync_mode == WB_SYNC_NONE) {
818 if (wbc->for_kupdate)
821 fs_info = BTRFS_I(mapping->host)->root->fs_info;
822 /* this is a bit racy, but that's ok */
823 ret = __percpu_counter_compare(&fs_info->dirty_metadata_bytes,
824 BTRFS_DIRTY_METADATA_THRESH,
825 fs_info->dirty_metadata_batch);
829 return btree_write_cache_pages(mapping, wbc);
832 static bool btree_release_folio(struct folio *folio, gfp_t gfp_flags)
834 if (folio_test_writeback(folio) || folio_test_dirty(folio))
837 return try_release_extent_buffer(&folio->page);
840 static void btree_invalidate_folio(struct folio *folio, size_t offset,
843 struct extent_io_tree *tree;
844 tree = &BTRFS_I(folio->mapping->host)->io_tree;
845 extent_invalidate_folio(tree, folio, offset);
846 btree_release_folio(folio, GFP_NOFS);
847 if (folio_get_private(folio)) {
848 btrfs_warn(BTRFS_I(folio->mapping->host)->root->fs_info,
849 "folio private not zero on folio %llu",
850 (unsigned long long)folio_pos(folio));
851 folio_detach_private(folio);
856 static bool btree_dirty_folio(struct address_space *mapping,
859 struct btrfs_fs_info *fs_info = btrfs_sb(mapping->host->i_sb);
860 struct btrfs_subpage *subpage;
861 struct extent_buffer *eb;
863 u64 page_start = folio_pos(folio);
865 if (fs_info->sectorsize == PAGE_SIZE) {
866 eb = folio_get_private(folio);
868 BUG_ON(!test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags));
869 BUG_ON(!atomic_read(&eb->refs));
870 btrfs_assert_tree_write_locked(eb);
871 return filemap_dirty_folio(mapping, folio);
873 subpage = folio_get_private(folio);
875 ASSERT(subpage->dirty_bitmap);
876 while (cur_bit < BTRFS_SUBPAGE_BITMAP_SIZE) {
879 u16 tmp = (1 << cur_bit);
881 spin_lock_irqsave(&subpage->lock, flags);
882 if (!(tmp & subpage->dirty_bitmap)) {
883 spin_unlock_irqrestore(&subpage->lock, flags);
887 spin_unlock_irqrestore(&subpage->lock, flags);
888 cur = page_start + cur_bit * fs_info->sectorsize;
890 eb = find_extent_buffer(fs_info, cur);
892 ASSERT(test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags));
893 ASSERT(atomic_read(&eb->refs));
894 btrfs_assert_tree_write_locked(eb);
895 free_extent_buffer(eb);
897 cur_bit += (fs_info->nodesize >> fs_info->sectorsize_bits);
899 return filemap_dirty_folio(mapping, folio);
902 #define btree_dirty_folio filemap_dirty_folio
905 static const struct address_space_operations btree_aops = {
906 .writepages = btree_writepages,
907 .release_folio = btree_release_folio,
908 .invalidate_folio = btree_invalidate_folio,
909 .migrate_folio = btree_migrate_folio,
910 .dirty_folio = btree_dirty_folio,
913 struct extent_buffer *btrfs_find_create_tree_block(
914 struct btrfs_fs_info *fs_info,
915 u64 bytenr, u64 owner_root,
918 if (btrfs_is_testing(fs_info))
919 return alloc_test_extent_buffer(fs_info, bytenr);
920 return alloc_extent_buffer(fs_info, bytenr, owner_root, level);
924 * Read tree block at logical address @bytenr and do variant basic but critical
927 * @owner_root: the objectid of the root owner for this block.
928 * @parent_transid: expected transid of this tree block, skip check if 0
929 * @level: expected level, mandatory check
930 * @first_key: expected key in slot 0, skip check if NULL
932 struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
933 u64 owner_root, u64 parent_transid,
934 int level, struct btrfs_key *first_key)
936 struct extent_buffer *buf = NULL;
939 buf = btrfs_find_create_tree_block(fs_info, bytenr, owner_root, level);
943 ret = btrfs_read_extent_buffer(buf, parent_transid, level, first_key);
945 free_extent_buffer_stale(buf);
948 if (btrfs_check_eb_owner(buf, owner_root)) {
949 free_extent_buffer_stale(buf);
950 return ERR_PTR(-EUCLEAN);
956 void btrfs_clean_tree_block(struct extent_buffer *buf)
958 struct btrfs_fs_info *fs_info = buf->fs_info;
959 if (btrfs_header_generation(buf) ==
960 fs_info->running_transaction->transid) {
961 btrfs_assert_tree_write_locked(buf);
963 if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)) {
964 percpu_counter_add_batch(&fs_info->dirty_metadata_bytes,
966 fs_info->dirty_metadata_batch);
967 clear_extent_buffer_dirty(buf);
972 static void __setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info,
975 bool dummy = test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);
977 memset(&root->root_key, 0, sizeof(root->root_key));
978 memset(&root->root_item, 0, sizeof(root->root_item));
979 memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
980 root->fs_info = fs_info;
981 root->root_key.objectid = objectid;
983 root->commit_root = NULL;
985 RB_CLEAR_NODE(&root->rb_node);
987 root->last_trans = 0;
988 root->free_objectid = 0;
989 root->nr_delalloc_inodes = 0;
990 root->nr_ordered_extents = 0;
991 root->inode_tree = RB_ROOT;
992 INIT_RADIX_TREE(&root->delayed_nodes_tree, GFP_ATOMIC);
994 btrfs_init_root_block_rsv(root);
996 INIT_LIST_HEAD(&root->dirty_list);
997 INIT_LIST_HEAD(&root->root_list);
998 INIT_LIST_HEAD(&root->delalloc_inodes);
999 INIT_LIST_HEAD(&root->delalloc_root);
1000 INIT_LIST_HEAD(&root->ordered_extents);
1001 INIT_LIST_HEAD(&root->ordered_root);
1002 INIT_LIST_HEAD(&root->reloc_dirty_list);
1003 INIT_LIST_HEAD(&root->logged_list[0]);
1004 INIT_LIST_HEAD(&root->logged_list[1]);
1005 spin_lock_init(&root->inode_lock);
1006 spin_lock_init(&root->delalloc_lock);
1007 spin_lock_init(&root->ordered_extent_lock);
1008 spin_lock_init(&root->accounting_lock);
1009 spin_lock_init(&root->log_extents_lock[0]);
1010 spin_lock_init(&root->log_extents_lock[1]);
1011 spin_lock_init(&root->qgroup_meta_rsv_lock);
1012 mutex_init(&root->objectid_mutex);
1013 mutex_init(&root->log_mutex);
1014 mutex_init(&root->ordered_extent_mutex);
1015 mutex_init(&root->delalloc_mutex);
1016 init_waitqueue_head(&root->qgroup_flush_wait);
1017 init_waitqueue_head(&root->log_writer_wait);
1018 init_waitqueue_head(&root->log_commit_wait[0]);
1019 init_waitqueue_head(&root->log_commit_wait[1]);
1020 INIT_LIST_HEAD(&root->log_ctxs[0]);
1021 INIT_LIST_HEAD(&root->log_ctxs[1]);
1022 atomic_set(&root->log_commit[0], 0);
1023 atomic_set(&root->log_commit[1], 0);
1024 atomic_set(&root->log_writers, 0);
1025 atomic_set(&root->log_batch, 0);
1026 refcount_set(&root->refs, 1);
1027 atomic_set(&root->snapshot_force_cow, 0);
1028 atomic_set(&root->nr_swapfiles, 0);
1029 root->log_transid = 0;
1030 root->log_transid_committed = -1;
1031 root->last_log_commit = 0;
1034 extent_io_tree_init(fs_info, &root->dirty_log_pages,
1035 IO_TREE_ROOT_DIRTY_LOG_PAGES, NULL);
1036 extent_io_tree_init(fs_info, &root->log_csum_range,
1037 IO_TREE_LOG_CSUM_RANGE, NULL);
1040 spin_lock_init(&root->root_item_lock);
1041 btrfs_qgroup_init_swapped_blocks(&root->swapped_blocks);
1042 #ifdef CONFIG_BTRFS_DEBUG
1043 INIT_LIST_HEAD(&root->leak_list);
1044 spin_lock(&fs_info->fs_roots_radix_lock);
1045 list_add_tail(&root->leak_list, &fs_info->allocated_roots);
1046 spin_unlock(&fs_info->fs_roots_radix_lock);
1050 static struct btrfs_root *btrfs_alloc_root(struct btrfs_fs_info *fs_info,
1051 u64 objectid, gfp_t flags)
1053 struct btrfs_root *root = kzalloc(sizeof(*root), flags);
1055 __setup_root(root, fs_info, objectid);
1059 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1060 /* Should only be used by the testing infrastructure */
1061 struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info)
1063 struct btrfs_root *root;
1066 return ERR_PTR(-EINVAL);
1068 root = btrfs_alloc_root(fs_info, BTRFS_ROOT_TREE_OBJECTID, GFP_KERNEL);
1070 return ERR_PTR(-ENOMEM);
1072 /* We don't use the stripesize in selftest, set it as sectorsize */
1073 root->alloc_bytenr = 0;
1079 static int global_root_cmp(struct rb_node *a_node, const struct rb_node *b_node)
1081 const struct btrfs_root *a = rb_entry(a_node, struct btrfs_root, rb_node);
1082 const struct btrfs_root *b = rb_entry(b_node, struct btrfs_root, rb_node);
1084 return btrfs_comp_cpu_keys(&a->root_key, &b->root_key);
1087 static int global_root_key_cmp(const void *k, const struct rb_node *node)
1089 const struct btrfs_key *key = k;
1090 const struct btrfs_root *root = rb_entry(node, struct btrfs_root, rb_node);
1092 return btrfs_comp_cpu_keys(key, &root->root_key);
1095 int btrfs_global_root_insert(struct btrfs_root *root)
1097 struct btrfs_fs_info *fs_info = root->fs_info;
1098 struct rb_node *tmp;
1100 write_lock(&fs_info->global_root_lock);
1101 tmp = rb_find_add(&root->rb_node, &fs_info->global_root_tree, global_root_cmp);
1102 write_unlock(&fs_info->global_root_lock);
1105 return tmp ? -EEXIST : 0;
1108 void btrfs_global_root_delete(struct btrfs_root *root)
1110 struct btrfs_fs_info *fs_info = root->fs_info;
1112 write_lock(&fs_info->global_root_lock);
1113 rb_erase(&root->rb_node, &fs_info->global_root_tree);
1114 write_unlock(&fs_info->global_root_lock);
1117 struct btrfs_root *btrfs_global_root(struct btrfs_fs_info *fs_info,
1118 struct btrfs_key *key)
1120 struct rb_node *node;
1121 struct btrfs_root *root = NULL;
1123 read_lock(&fs_info->global_root_lock);
1124 node = rb_find(key, &fs_info->global_root_tree, global_root_key_cmp);
1126 root = container_of(node, struct btrfs_root, rb_node);
1127 read_unlock(&fs_info->global_root_lock);
1132 static u64 btrfs_global_root_id(struct btrfs_fs_info *fs_info, u64 bytenr)
1134 struct btrfs_block_group *block_group;
1137 if (!btrfs_fs_incompat(fs_info, EXTENT_TREE_V2))
1141 block_group = btrfs_lookup_block_group(fs_info, bytenr);
1143 block_group = btrfs_lookup_first_block_group(fs_info, bytenr);
1144 ASSERT(block_group);
1147 ret = block_group->global_root_id;
1148 btrfs_put_block_group(block_group);
1153 struct btrfs_root *btrfs_csum_root(struct btrfs_fs_info *fs_info, u64 bytenr)
1155 struct btrfs_key key = {
1156 .objectid = BTRFS_CSUM_TREE_OBJECTID,
1157 .type = BTRFS_ROOT_ITEM_KEY,
1158 .offset = btrfs_global_root_id(fs_info, bytenr),
1161 return btrfs_global_root(fs_info, &key);
1164 struct btrfs_root *btrfs_extent_root(struct btrfs_fs_info *fs_info, u64 bytenr)
1166 struct btrfs_key key = {
1167 .objectid = BTRFS_EXTENT_TREE_OBJECTID,
1168 .type = BTRFS_ROOT_ITEM_KEY,
1169 .offset = btrfs_global_root_id(fs_info, bytenr),
1172 return btrfs_global_root(fs_info, &key);
1175 struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
1178 struct btrfs_fs_info *fs_info = trans->fs_info;
1179 struct extent_buffer *leaf;
1180 struct btrfs_root *tree_root = fs_info->tree_root;
1181 struct btrfs_root *root;
1182 struct btrfs_key key;
1183 unsigned int nofs_flag;
1187 * We're holding a transaction handle, so use a NOFS memory allocation
1188 * context to avoid deadlock if reclaim happens.
1190 nofs_flag = memalloc_nofs_save();
1191 root = btrfs_alloc_root(fs_info, objectid, GFP_KERNEL);
1192 memalloc_nofs_restore(nofs_flag);
1194 return ERR_PTR(-ENOMEM);
1196 root->root_key.objectid = objectid;
1197 root->root_key.type = BTRFS_ROOT_ITEM_KEY;
1198 root->root_key.offset = 0;
1200 leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0,
1201 BTRFS_NESTING_NORMAL);
1203 ret = PTR_ERR(leaf);
1209 btrfs_mark_buffer_dirty(leaf);
1211 root->commit_root = btrfs_root_node(root);
1212 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
1214 btrfs_set_root_flags(&root->root_item, 0);
1215 btrfs_set_root_limit(&root->root_item, 0);
1216 btrfs_set_root_bytenr(&root->root_item, leaf->start);
1217 btrfs_set_root_generation(&root->root_item, trans->transid);
1218 btrfs_set_root_level(&root->root_item, 0);
1219 btrfs_set_root_refs(&root->root_item, 1);
1220 btrfs_set_root_used(&root->root_item, leaf->len);
1221 btrfs_set_root_last_snapshot(&root->root_item, 0);
1222 btrfs_set_root_dirid(&root->root_item, 0);
1223 if (is_fstree(objectid))
1224 generate_random_guid(root->root_item.uuid);
1226 export_guid(root->root_item.uuid, &guid_null);
1227 btrfs_set_root_drop_level(&root->root_item, 0);
1229 btrfs_tree_unlock(leaf);
1231 key.objectid = objectid;
1232 key.type = BTRFS_ROOT_ITEM_KEY;
1234 ret = btrfs_insert_root(trans, tree_root, &key, &root->root_item);
1242 btrfs_tree_unlock(leaf);
1244 btrfs_put_root(root);
1246 return ERR_PTR(ret);
1249 static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans,
1250 struct btrfs_fs_info *fs_info)
1252 struct btrfs_root *root;
1254 root = btrfs_alloc_root(fs_info, BTRFS_TREE_LOG_OBJECTID, GFP_NOFS);
1256 return ERR_PTR(-ENOMEM);
1258 root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID;
1259 root->root_key.type = BTRFS_ROOT_ITEM_KEY;
1260 root->root_key.offset = BTRFS_TREE_LOG_OBJECTID;
1265 int btrfs_alloc_log_tree_node(struct btrfs_trans_handle *trans,
1266 struct btrfs_root *root)
1268 struct extent_buffer *leaf;
1271 * DON'T set SHAREABLE bit for log trees.
1273 * Log trees are not exposed to user space thus can't be snapshotted,
1274 * and they go away before a real commit is actually done.
1276 * They do store pointers to file data extents, and those reference
1277 * counts still get updated (along with back refs to the log tree).
1280 leaf = btrfs_alloc_tree_block(trans, root, 0, BTRFS_TREE_LOG_OBJECTID,
1281 NULL, 0, 0, 0, BTRFS_NESTING_NORMAL);
1283 return PTR_ERR(leaf);
1287 btrfs_mark_buffer_dirty(root->node);
1288 btrfs_tree_unlock(root->node);
1293 int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
1294 struct btrfs_fs_info *fs_info)
1296 struct btrfs_root *log_root;
1298 log_root = alloc_log_tree(trans, fs_info);
1299 if (IS_ERR(log_root))
1300 return PTR_ERR(log_root);
1302 if (!btrfs_is_zoned(fs_info)) {
1303 int ret = btrfs_alloc_log_tree_node(trans, log_root);
1306 btrfs_put_root(log_root);
1311 WARN_ON(fs_info->log_root_tree);
1312 fs_info->log_root_tree = log_root;
1316 int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
1317 struct btrfs_root *root)
1319 struct btrfs_fs_info *fs_info = root->fs_info;
1320 struct btrfs_root *log_root;
1321 struct btrfs_inode_item *inode_item;
1324 log_root = alloc_log_tree(trans, fs_info);
1325 if (IS_ERR(log_root))
1326 return PTR_ERR(log_root);
1328 ret = btrfs_alloc_log_tree_node(trans, log_root);
1330 btrfs_put_root(log_root);
1334 log_root->last_trans = trans->transid;
1335 log_root->root_key.offset = root->root_key.objectid;
1337 inode_item = &log_root->root_item.inode;
1338 btrfs_set_stack_inode_generation(inode_item, 1);
1339 btrfs_set_stack_inode_size(inode_item, 3);
1340 btrfs_set_stack_inode_nlink(inode_item, 1);
1341 btrfs_set_stack_inode_nbytes(inode_item,
1343 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
1345 btrfs_set_root_node(&log_root->root_item, log_root->node);
1347 WARN_ON(root->log_root);
1348 root->log_root = log_root;
1349 root->log_transid = 0;
1350 root->log_transid_committed = -1;
1351 root->last_log_commit = 0;
1355 static struct btrfs_root *read_tree_root_path(struct btrfs_root *tree_root,
1356 struct btrfs_path *path,
1357 struct btrfs_key *key)
1359 struct btrfs_root *root;
1360 struct btrfs_fs_info *fs_info = tree_root->fs_info;
1365 root = btrfs_alloc_root(fs_info, key->objectid, GFP_NOFS);
1367 return ERR_PTR(-ENOMEM);
1369 ret = btrfs_find_root(tree_root, key, path,
1370 &root->root_item, &root->root_key);
1377 generation = btrfs_root_generation(&root->root_item);
1378 level = btrfs_root_level(&root->root_item);
1379 root->node = read_tree_block(fs_info,
1380 btrfs_root_bytenr(&root->root_item),
1381 key->objectid, generation, level, NULL);
1382 if (IS_ERR(root->node)) {
1383 ret = PTR_ERR(root->node);
1387 if (!btrfs_buffer_uptodate(root->node, generation, 0)) {
1393 * For real fs, and not log/reloc trees, root owner must
1394 * match its root node owner
1396 if (!test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state) &&
1397 root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID &&
1398 root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID &&
1399 root->root_key.objectid != btrfs_header_owner(root->node)) {
1401 "root=%llu block=%llu, tree root owner mismatch, have %llu expect %llu",
1402 root->root_key.objectid, root->node->start,
1403 btrfs_header_owner(root->node),
1404 root->root_key.objectid);
1408 root->commit_root = btrfs_root_node(root);
1411 btrfs_put_root(root);
1412 return ERR_PTR(ret);
1415 struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
1416 struct btrfs_key *key)
1418 struct btrfs_root *root;
1419 struct btrfs_path *path;
1421 path = btrfs_alloc_path();
1423 return ERR_PTR(-ENOMEM);
1424 root = read_tree_root_path(tree_root, path, key);
1425 btrfs_free_path(path);
1431 * Initialize subvolume root in-memory structure
1433 * @anon_dev: anonymous device to attach to the root, if zero, allocate new
1435 static int btrfs_init_fs_root(struct btrfs_root *root, dev_t anon_dev)
1438 unsigned int nofs_flag;
1441 * We might be called under a transaction (e.g. indirect backref
1442 * resolution) which could deadlock if it triggers memory reclaim
1444 nofs_flag = memalloc_nofs_save();
1445 ret = btrfs_drew_lock_init(&root->snapshot_lock);
1446 memalloc_nofs_restore(nofs_flag);
1450 if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID &&
1451 !btrfs_is_data_reloc_root(root)) {
1452 set_bit(BTRFS_ROOT_SHAREABLE, &root->state);
1453 btrfs_check_and_init_root_item(&root->root_item);
1457 * Don't assign anonymous block device to roots that are not exposed to
1458 * userspace, the id pool is limited to 1M
1460 if (is_fstree(root->root_key.objectid) &&
1461 btrfs_root_refs(&root->root_item) > 0) {
1463 ret = get_anon_bdev(&root->anon_dev);
1467 root->anon_dev = anon_dev;
1471 mutex_lock(&root->objectid_mutex);
1472 ret = btrfs_init_root_free_objectid(root);
1474 mutex_unlock(&root->objectid_mutex);
1478 ASSERT(root->free_objectid <= BTRFS_LAST_FREE_OBJECTID);
1480 mutex_unlock(&root->objectid_mutex);
1484 /* The caller is responsible to call btrfs_free_fs_root */
1488 static struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
1491 struct btrfs_root *root;
1493 spin_lock(&fs_info->fs_roots_radix_lock);
1494 root = radix_tree_lookup(&fs_info->fs_roots_radix,
1495 (unsigned long)root_id);
1497 root = btrfs_grab_root(root);
1498 spin_unlock(&fs_info->fs_roots_radix_lock);
1502 static struct btrfs_root *btrfs_get_global_root(struct btrfs_fs_info *fs_info,
1505 struct btrfs_key key = {
1506 .objectid = objectid,
1507 .type = BTRFS_ROOT_ITEM_KEY,
1511 if (objectid == BTRFS_ROOT_TREE_OBJECTID)
1512 return btrfs_grab_root(fs_info->tree_root);
1513 if (objectid == BTRFS_EXTENT_TREE_OBJECTID)
1514 return btrfs_grab_root(btrfs_global_root(fs_info, &key));
1515 if (objectid == BTRFS_CHUNK_TREE_OBJECTID)
1516 return btrfs_grab_root(fs_info->chunk_root);
1517 if (objectid == BTRFS_DEV_TREE_OBJECTID)
1518 return btrfs_grab_root(fs_info->dev_root);
1519 if (objectid == BTRFS_CSUM_TREE_OBJECTID)
1520 return btrfs_grab_root(btrfs_global_root(fs_info, &key));
1521 if (objectid == BTRFS_QUOTA_TREE_OBJECTID)
1522 return btrfs_grab_root(fs_info->quota_root) ?
1523 fs_info->quota_root : ERR_PTR(-ENOENT);
1524 if (objectid == BTRFS_UUID_TREE_OBJECTID)
1525 return btrfs_grab_root(fs_info->uuid_root) ?
1526 fs_info->uuid_root : ERR_PTR(-ENOENT);
1527 if (objectid == BTRFS_FREE_SPACE_TREE_OBJECTID) {
1528 struct btrfs_root *root = btrfs_global_root(fs_info, &key);
1530 return btrfs_grab_root(root) ? root : ERR_PTR(-ENOENT);
1535 int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
1536 struct btrfs_root *root)
1540 ret = radix_tree_preload(GFP_NOFS);
1544 spin_lock(&fs_info->fs_roots_radix_lock);
1545 ret = radix_tree_insert(&fs_info->fs_roots_radix,
1546 (unsigned long)root->root_key.objectid,
1549 btrfs_grab_root(root);
1550 set_bit(BTRFS_ROOT_IN_RADIX, &root->state);
1552 spin_unlock(&fs_info->fs_roots_radix_lock);
1553 radix_tree_preload_end();
1558 void btrfs_check_leaked_roots(struct btrfs_fs_info *fs_info)
1560 #ifdef CONFIG_BTRFS_DEBUG
1561 struct btrfs_root *root;
1563 while (!list_empty(&fs_info->allocated_roots)) {
1564 char buf[BTRFS_ROOT_NAME_BUF_LEN];
1566 root = list_first_entry(&fs_info->allocated_roots,
1567 struct btrfs_root, leak_list);
1568 btrfs_err(fs_info, "leaked root %s refcount %d",
1569 btrfs_root_name(&root->root_key, buf),
1570 refcount_read(&root->refs));
1571 while (refcount_read(&root->refs) > 1)
1572 btrfs_put_root(root);
1573 btrfs_put_root(root);
1578 static void free_global_roots(struct btrfs_fs_info *fs_info)
1580 struct btrfs_root *root;
1581 struct rb_node *node;
1583 while ((node = rb_first_postorder(&fs_info->global_root_tree)) != NULL) {
1584 root = rb_entry(node, struct btrfs_root, rb_node);
1585 rb_erase(&root->rb_node, &fs_info->global_root_tree);
1586 btrfs_put_root(root);
1590 void btrfs_free_fs_info(struct btrfs_fs_info *fs_info)
1592 percpu_counter_destroy(&fs_info->dirty_metadata_bytes);
1593 percpu_counter_destroy(&fs_info->delalloc_bytes);
1594 percpu_counter_destroy(&fs_info->ordered_bytes);
1595 percpu_counter_destroy(&fs_info->dev_replace.bio_counter);
1596 btrfs_free_csum_hash(fs_info);
1597 btrfs_free_stripe_hash_table(fs_info);
1598 btrfs_free_ref_cache(fs_info);
1599 kfree(fs_info->balance_ctl);
1600 kfree(fs_info->delayed_root);
1601 free_global_roots(fs_info);
1602 btrfs_put_root(fs_info->tree_root);
1603 btrfs_put_root(fs_info->chunk_root);
1604 btrfs_put_root(fs_info->dev_root);
1605 btrfs_put_root(fs_info->quota_root);
1606 btrfs_put_root(fs_info->uuid_root);
1607 btrfs_put_root(fs_info->fs_root);
1608 btrfs_put_root(fs_info->data_reloc_root);
1609 btrfs_put_root(fs_info->block_group_root);
1610 btrfs_check_leaked_roots(fs_info);
1611 btrfs_extent_buffer_leak_debug_check(fs_info);
1612 kfree(fs_info->super_copy);
1613 kfree(fs_info->super_for_commit);
1614 kfree(fs_info->subpage_info);
1620 * Get an in-memory reference of a root structure.
1622 * For essential trees like root/extent tree, we grab it from fs_info directly.
1623 * For subvolume trees, we check the cached filesystem roots first. If not
1624 * found, then read it from disk and add it to cached fs roots.
1626 * Caller should release the root by calling btrfs_put_root() after the usage.
1628 * NOTE: Reloc and log trees can't be read by this function as they share the
1629 * same root objectid.
1631 * @objectid: root id
1632 * @anon_dev: preallocated anonymous block device number for new roots,
1633 * pass 0 for new allocation.
1634 * @check_ref: whether to check root item references, If true, return -ENOENT
1637 static struct btrfs_root *btrfs_get_root_ref(struct btrfs_fs_info *fs_info,
1638 u64 objectid, dev_t anon_dev,
1641 struct btrfs_root *root;
1642 struct btrfs_path *path;
1643 struct btrfs_key key;
1646 root = btrfs_get_global_root(fs_info, objectid);
1650 root = btrfs_lookup_fs_root(fs_info, objectid);
1652 /* Shouldn't get preallocated anon_dev for cached roots */
1654 if (check_ref && btrfs_root_refs(&root->root_item) == 0) {
1655 btrfs_put_root(root);
1656 return ERR_PTR(-ENOENT);
1661 key.objectid = objectid;
1662 key.type = BTRFS_ROOT_ITEM_KEY;
1663 key.offset = (u64)-1;
1664 root = btrfs_read_tree_root(fs_info->tree_root, &key);
1668 if (check_ref && btrfs_root_refs(&root->root_item) == 0) {
1673 ret = btrfs_init_fs_root(root, anon_dev);
1677 path = btrfs_alloc_path();
1682 key.objectid = BTRFS_ORPHAN_OBJECTID;
1683 key.type = BTRFS_ORPHAN_ITEM_KEY;
1684 key.offset = objectid;
1686 ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0);
1687 btrfs_free_path(path);
1691 set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state);
1693 ret = btrfs_insert_fs_root(fs_info, root);
1695 if (ret == -EEXIST) {
1696 btrfs_put_root(root);
1704 * If our caller provided us an anonymous device, then it's his
1705 * responsibility to free it in case we fail. So we have to set our
1706 * root's anon_dev to 0 to avoid a double free, once by btrfs_put_root()
1707 * and once again by our caller.
1711 btrfs_put_root(root);
1712 return ERR_PTR(ret);
1716 * Get in-memory reference of a root structure
1718 * @objectid: tree objectid
1719 * @check_ref: if set, verify that the tree exists and the item has at least
1722 struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
1723 u64 objectid, bool check_ref)
1725 return btrfs_get_root_ref(fs_info, objectid, 0, check_ref);
1729 * Get in-memory reference of a root structure, created as new, optionally pass
1730 * the anonymous block device id
1732 * @objectid: tree objectid
1733 * @anon_dev: if zero, allocate a new anonymous block device or use the
1736 struct btrfs_root *btrfs_get_new_fs_root(struct btrfs_fs_info *fs_info,
1737 u64 objectid, dev_t anon_dev)
1739 return btrfs_get_root_ref(fs_info, objectid, anon_dev, true);
1743 * btrfs_get_fs_root_commit_root - return a root for the given objectid
1744 * @fs_info: the fs_info
1745 * @objectid: the objectid we need to lookup
1747 * This is exclusively used for backref walking, and exists specifically because
1748 * of how qgroups does lookups. Qgroups will do a backref lookup at delayed ref
1749 * creation time, which means we may have to read the tree_root in order to look
1750 * up a fs root that is not in memory. If the root is not in memory we will
1751 * read the tree root commit root and look up the fs root from there. This is a
1752 * temporary root, it will not be inserted into the radix tree as it doesn't
1753 * have the most uptodate information, it'll simply be discarded once the
1754 * backref code is finished using the root.
1756 struct btrfs_root *btrfs_get_fs_root_commit_root(struct btrfs_fs_info *fs_info,
1757 struct btrfs_path *path,
1760 struct btrfs_root *root;
1761 struct btrfs_key key;
1763 ASSERT(path->search_commit_root && path->skip_locking);
1766 * This can return -ENOENT if we ask for a root that doesn't exist, but
1767 * since this is called via the backref walking code we won't be looking
1768 * up a root that doesn't exist, unless there's corruption. So if root
1769 * != NULL just return it.
1771 root = btrfs_get_global_root(fs_info, objectid);
1775 root = btrfs_lookup_fs_root(fs_info, objectid);
1779 key.objectid = objectid;
1780 key.type = BTRFS_ROOT_ITEM_KEY;
1781 key.offset = (u64)-1;
1782 root = read_tree_root_path(fs_info->tree_root, path, &key);
1783 btrfs_release_path(path);
1788 static int cleaner_kthread(void *arg)
1790 struct btrfs_fs_info *fs_info = arg;
1796 set_bit(BTRFS_FS_CLEANER_RUNNING, &fs_info->flags);
1798 /* Make the cleaner go to sleep early. */
1799 if (btrfs_need_cleaner_sleep(fs_info))
1803 * Do not do anything if we might cause open_ctree() to block
1804 * before we have finished mounting the filesystem.
1806 if (!test_bit(BTRFS_FS_OPEN, &fs_info->flags))
1809 if (!mutex_trylock(&fs_info->cleaner_mutex))
1813 * Avoid the problem that we change the status of the fs
1814 * during the above check and trylock.
1816 if (btrfs_need_cleaner_sleep(fs_info)) {
1817 mutex_unlock(&fs_info->cleaner_mutex);
1821 btrfs_run_delayed_iputs(fs_info);
1823 again = btrfs_clean_one_deleted_snapshot(fs_info);
1824 mutex_unlock(&fs_info->cleaner_mutex);
1827 * The defragger has dealt with the R/O remount and umount,
1828 * needn't do anything special here.
1830 btrfs_run_defrag_inodes(fs_info);
1833 * Acquires fs_info->reclaim_bgs_lock to avoid racing
1834 * with relocation (btrfs_relocate_chunk) and relocation
1835 * acquires fs_info->cleaner_mutex (btrfs_relocate_block_group)
1836 * after acquiring fs_info->reclaim_bgs_lock. So we
1837 * can't hold, nor need to, fs_info->cleaner_mutex when deleting
1838 * unused block groups.
1840 btrfs_delete_unused_bgs(fs_info);
1843 * Reclaim block groups in the reclaim_bgs list after we deleted
1844 * all unused block_groups. This possibly gives us some more free
1847 btrfs_reclaim_bgs(fs_info);
1849 clear_and_wake_up_bit(BTRFS_FS_CLEANER_RUNNING, &fs_info->flags);
1850 if (kthread_should_park())
1852 if (kthread_should_stop())
1855 set_current_state(TASK_INTERRUPTIBLE);
1857 __set_current_state(TASK_RUNNING);
1862 static int transaction_kthread(void *arg)
1864 struct btrfs_root *root = arg;
1865 struct btrfs_fs_info *fs_info = root->fs_info;
1866 struct btrfs_trans_handle *trans;
1867 struct btrfs_transaction *cur;
1870 unsigned long delay;
1874 cannot_commit = false;
1875 delay = msecs_to_jiffies(fs_info->commit_interval * 1000);
1876 mutex_lock(&fs_info->transaction_kthread_mutex);
1878 spin_lock(&fs_info->trans_lock);
1879 cur = fs_info->running_transaction;
1881 spin_unlock(&fs_info->trans_lock);
1885 delta = ktime_get_seconds() - cur->start_time;
1886 if (!test_and_clear_bit(BTRFS_FS_COMMIT_TRANS, &fs_info->flags) &&
1887 cur->state < TRANS_STATE_COMMIT_START &&
1888 delta < fs_info->commit_interval) {
1889 spin_unlock(&fs_info->trans_lock);
1890 delay -= msecs_to_jiffies((delta - 1) * 1000);
1892 msecs_to_jiffies(fs_info->commit_interval * 1000));
1895 transid = cur->transid;
1896 spin_unlock(&fs_info->trans_lock);
1898 /* If the file system is aborted, this will always fail. */
1899 trans = btrfs_attach_transaction(root);
1900 if (IS_ERR(trans)) {
1901 if (PTR_ERR(trans) != -ENOENT)
1902 cannot_commit = true;
1905 if (transid == trans->transid) {
1906 btrfs_commit_transaction(trans);
1908 btrfs_end_transaction(trans);
1911 wake_up_process(fs_info->cleaner_kthread);
1912 mutex_unlock(&fs_info->transaction_kthread_mutex);
1914 if (BTRFS_FS_ERROR(fs_info))
1915 btrfs_cleanup_transaction(fs_info);
1916 if (!kthread_should_stop() &&
1917 (!btrfs_transaction_blocked(fs_info) ||
1919 schedule_timeout_interruptible(delay);
1920 } while (!kthread_should_stop());
1925 * This will find the highest generation in the array of root backups. The
1926 * index of the highest array is returned, or -EINVAL if we can't find
1929 * We check to make sure the array is valid by comparing the
1930 * generation of the latest root in the array with the generation
1931 * in the super block. If they don't match we pitch it.
1933 static int find_newest_super_backup(struct btrfs_fs_info *info)
1935 const u64 newest_gen = btrfs_super_generation(info->super_copy);
1937 struct btrfs_root_backup *root_backup;
1940 for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
1941 root_backup = info->super_copy->super_roots + i;
1942 cur = btrfs_backup_tree_root_gen(root_backup);
1943 if (cur == newest_gen)
1951 * copy all the root pointers into the super backup array.
1952 * this will bump the backup pointer by one when it is
1955 static void backup_super_roots(struct btrfs_fs_info *info)
1957 const int next_backup = info->backup_root_index;
1958 struct btrfs_root_backup *root_backup;
1960 root_backup = info->super_for_commit->super_roots + next_backup;
1963 * make sure all of our padding and empty slots get zero filled
1964 * regardless of which ones we use today
1966 memset(root_backup, 0, sizeof(*root_backup));
1968 info->backup_root_index = (next_backup + 1) % BTRFS_NUM_BACKUP_ROOTS;
1970 btrfs_set_backup_tree_root(root_backup, info->tree_root->node->start);
1971 btrfs_set_backup_tree_root_gen(root_backup,
1972 btrfs_header_generation(info->tree_root->node));
1974 btrfs_set_backup_tree_root_level(root_backup,
1975 btrfs_header_level(info->tree_root->node));
1977 btrfs_set_backup_chunk_root(root_backup, info->chunk_root->node->start);
1978 btrfs_set_backup_chunk_root_gen(root_backup,
1979 btrfs_header_generation(info->chunk_root->node));
1980 btrfs_set_backup_chunk_root_level(root_backup,
1981 btrfs_header_level(info->chunk_root->node));
1983 if (btrfs_fs_incompat(info, EXTENT_TREE_V2)) {
1984 btrfs_set_backup_block_group_root(root_backup,
1985 info->block_group_root->node->start);
1986 btrfs_set_backup_block_group_root_gen(root_backup,
1987 btrfs_header_generation(info->block_group_root->node));
1988 btrfs_set_backup_block_group_root_level(root_backup,
1989 btrfs_header_level(info->block_group_root->node));
1991 struct btrfs_root *extent_root = btrfs_extent_root(info, 0);
1992 struct btrfs_root *csum_root = btrfs_csum_root(info, 0);
1994 btrfs_set_backup_extent_root(root_backup,
1995 extent_root->node->start);
1996 btrfs_set_backup_extent_root_gen(root_backup,
1997 btrfs_header_generation(extent_root->node));
1998 btrfs_set_backup_extent_root_level(root_backup,
1999 btrfs_header_level(extent_root->node));
2001 btrfs_set_backup_csum_root(root_backup, csum_root->node->start);
2002 btrfs_set_backup_csum_root_gen(root_backup,
2003 btrfs_header_generation(csum_root->node));
2004 btrfs_set_backup_csum_root_level(root_backup,
2005 btrfs_header_level(csum_root->node));
2009 * we might commit during log recovery, which happens before we set
2010 * the fs_root. Make sure it is valid before we fill it in.
2012 if (info->fs_root && info->fs_root->node) {
2013 btrfs_set_backup_fs_root(root_backup,
2014 info->fs_root->node->start);
2015 btrfs_set_backup_fs_root_gen(root_backup,
2016 btrfs_header_generation(info->fs_root->node));
2017 btrfs_set_backup_fs_root_level(root_backup,
2018 btrfs_header_level(info->fs_root->node));
2021 btrfs_set_backup_dev_root(root_backup, info->dev_root->node->start);
2022 btrfs_set_backup_dev_root_gen(root_backup,
2023 btrfs_header_generation(info->dev_root->node));
2024 btrfs_set_backup_dev_root_level(root_backup,
2025 btrfs_header_level(info->dev_root->node));
2027 btrfs_set_backup_total_bytes(root_backup,
2028 btrfs_super_total_bytes(info->super_copy));
2029 btrfs_set_backup_bytes_used(root_backup,
2030 btrfs_super_bytes_used(info->super_copy));
2031 btrfs_set_backup_num_devices(root_backup,
2032 btrfs_super_num_devices(info->super_copy));
2035 * if we don't copy this out to the super_copy, it won't get remembered
2036 * for the next commit
2038 memcpy(&info->super_copy->super_roots,
2039 &info->super_for_commit->super_roots,
2040 sizeof(*root_backup) * BTRFS_NUM_BACKUP_ROOTS);
2044 * read_backup_root - Reads a backup root based on the passed priority. Prio 0
2045 * is the newest, prio 1/2/3 are 2nd newest/3rd newest/4th (oldest) backup roots
2047 * fs_info - filesystem whose backup roots need to be read
2048 * priority - priority of backup root required
2050 * Returns backup root index on success and -EINVAL otherwise.
2052 static int read_backup_root(struct btrfs_fs_info *fs_info, u8 priority)
2054 int backup_index = find_newest_super_backup(fs_info);
2055 struct btrfs_super_block *super = fs_info->super_copy;
2056 struct btrfs_root_backup *root_backup;
2058 if (priority < BTRFS_NUM_BACKUP_ROOTS && backup_index >= 0) {
2060 return backup_index;
2062 backup_index = backup_index + BTRFS_NUM_BACKUP_ROOTS - priority;
2063 backup_index %= BTRFS_NUM_BACKUP_ROOTS;
2068 root_backup = super->super_roots + backup_index;
2070 btrfs_set_super_generation(super,
2071 btrfs_backup_tree_root_gen(root_backup));
2072 btrfs_set_super_root(super, btrfs_backup_tree_root(root_backup));
2073 btrfs_set_super_root_level(super,
2074 btrfs_backup_tree_root_level(root_backup));
2075 btrfs_set_super_bytes_used(super, btrfs_backup_bytes_used(root_backup));
2078 * Fixme: the total bytes and num_devices need to match or we should
2081 btrfs_set_super_total_bytes(super, btrfs_backup_total_bytes(root_backup));
2082 btrfs_set_super_num_devices(super, btrfs_backup_num_devices(root_backup));
2084 return backup_index;
2087 /* helper to cleanup workers */
2088 static void btrfs_stop_all_workers(struct btrfs_fs_info *fs_info)
2090 btrfs_destroy_workqueue(fs_info->fixup_workers);
2091 btrfs_destroy_workqueue(fs_info->delalloc_workers);
2092 btrfs_destroy_workqueue(fs_info->hipri_workers);
2093 btrfs_destroy_workqueue(fs_info->workers);
2094 if (fs_info->endio_workers)
2095 destroy_workqueue(fs_info->endio_workers);
2096 if (fs_info->endio_raid56_workers)
2097 destroy_workqueue(fs_info->endio_raid56_workers);
2098 if (fs_info->rmw_workers)
2099 destroy_workqueue(fs_info->rmw_workers);
2100 if (fs_info->compressed_write_workers)
2101 destroy_workqueue(fs_info->compressed_write_workers);
2102 btrfs_destroy_workqueue(fs_info->endio_write_workers);
2103 btrfs_destroy_workqueue(fs_info->endio_freespace_worker);
2104 btrfs_destroy_workqueue(fs_info->delayed_workers);
2105 btrfs_destroy_workqueue(fs_info->caching_workers);
2106 btrfs_destroy_workqueue(fs_info->flush_workers);
2107 btrfs_destroy_workqueue(fs_info->qgroup_rescan_workers);
2108 if (fs_info->discard_ctl.discard_workers)
2109 destroy_workqueue(fs_info->discard_ctl.discard_workers);
2111 * Now that all other work queues are destroyed, we can safely destroy
2112 * the queues used for metadata I/O, since tasks from those other work
2113 * queues can do metadata I/O operations.
2115 if (fs_info->endio_meta_workers)
2116 destroy_workqueue(fs_info->endio_meta_workers);
2119 static void free_root_extent_buffers(struct btrfs_root *root)
2122 free_extent_buffer(root->node);
2123 free_extent_buffer(root->commit_root);
2125 root->commit_root = NULL;
2129 static void free_global_root_pointers(struct btrfs_fs_info *fs_info)
2131 struct btrfs_root *root, *tmp;
2133 rbtree_postorder_for_each_entry_safe(root, tmp,
2134 &fs_info->global_root_tree,
2136 free_root_extent_buffers(root);
2139 /* helper to cleanup tree roots */
2140 static void free_root_pointers(struct btrfs_fs_info *info, bool free_chunk_root)
2142 free_root_extent_buffers(info->tree_root);
2144 free_global_root_pointers(info);
2145 free_root_extent_buffers(info->dev_root);
2146 free_root_extent_buffers(info->quota_root);
2147 free_root_extent_buffers(info->uuid_root);
2148 free_root_extent_buffers(info->fs_root);
2149 free_root_extent_buffers(info->data_reloc_root);
2150 free_root_extent_buffers(info->block_group_root);
2151 if (free_chunk_root)
2152 free_root_extent_buffers(info->chunk_root);
2155 void btrfs_put_root(struct btrfs_root *root)
2160 if (refcount_dec_and_test(&root->refs)) {
2161 WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree));
2162 WARN_ON(test_bit(BTRFS_ROOT_DEAD_RELOC_TREE, &root->state));
2164 free_anon_bdev(root->anon_dev);
2165 btrfs_drew_lock_destroy(&root->snapshot_lock);
2166 free_root_extent_buffers(root);
2167 #ifdef CONFIG_BTRFS_DEBUG
2168 spin_lock(&root->fs_info->fs_roots_radix_lock);
2169 list_del_init(&root->leak_list);
2170 spin_unlock(&root->fs_info->fs_roots_radix_lock);
2176 void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info)
2179 struct btrfs_root *gang[8];
2182 while (!list_empty(&fs_info->dead_roots)) {
2183 gang[0] = list_entry(fs_info->dead_roots.next,
2184 struct btrfs_root, root_list);
2185 list_del(&gang[0]->root_list);
2187 if (test_bit(BTRFS_ROOT_IN_RADIX, &gang[0]->state))
2188 btrfs_drop_and_free_fs_root(fs_info, gang[0]);
2189 btrfs_put_root(gang[0]);
2193 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
2198 for (i = 0; i < ret; i++)
2199 btrfs_drop_and_free_fs_root(fs_info, gang[i]);
2203 static void btrfs_init_scrub(struct btrfs_fs_info *fs_info)
2205 mutex_init(&fs_info->scrub_lock);
2206 atomic_set(&fs_info->scrubs_running, 0);
2207 atomic_set(&fs_info->scrub_pause_req, 0);
2208 atomic_set(&fs_info->scrubs_paused, 0);
2209 atomic_set(&fs_info->scrub_cancel_req, 0);
2210 init_waitqueue_head(&fs_info->scrub_pause_wait);
2211 refcount_set(&fs_info->scrub_workers_refcnt, 0);
2214 static void btrfs_init_balance(struct btrfs_fs_info *fs_info)
2216 spin_lock_init(&fs_info->balance_lock);
2217 mutex_init(&fs_info->balance_mutex);
2218 atomic_set(&fs_info->balance_pause_req, 0);
2219 atomic_set(&fs_info->balance_cancel_req, 0);
2220 fs_info->balance_ctl = NULL;
2221 init_waitqueue_head(&fs_info->balance_wait_q);
2222 atomic_set(&fs_info->reloc_cancel_req, 0);
2225 static void btrfs_init_btree_inode(struct btrfs_fs_info *fs_info)
2227 struct inode *inode = fs_info->btree_inode;
2229 inode->i_ino = BTRFS_BTREE_INODE_OBJECTID;
2230 set_nlink(inode, 1);
2232 * we set the i_size on the btree inode to the max possible int.
2233 * the real end of the address space is determined by all of
2234 * the devices in the system
2236 inode->i_size = OFFSET_MAX;
2237 inode->i_mapping->a_ops = &btree_aops;
2239 RB_CLEAR_NODE(&BTRFS_I(inode)->rb_node);
2240 extent_io_tree_init(fs_info, &BTRFS_I(inode)->io_tree,
2241 IO_TREE_BTREE_INODE_IO, inode);
2242 BTRFS_I(inode)->io_tree.track_uptodate = false;
2243 extent_map_tree_init(&BTRFS_I(inode)->extent_tree);
2245 BTRFS_I(inode)->root = btrfs_grab_root(fs_info->tree_root);
2246 BTRFS_I(inode)->location.objectid = BTRFS_BTREE_INODE_OBJECTID;
2247 BTRFS_I(inode)->location.type = 0;
2248 BTRFS_I(inode)->location.offset = 0;
2249 set_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags);
2250 btrfs_insert_inode_hash(inode);
2253 static void btrfs_init_dev_replace_locks(struct btrfs_fs_info *fs_info)
2255 mutex_init(&fs_info->dev_replace.lock_finishing_cancel_unmount);
2256 init_rwsem(&fs_info->dev_replace.rwsem);
2257 init_waitqueue_head(&fs_info->dev_replace.replace_wait);
2260 static void btrfs_init_qgroup(struct btrfs_fs_info *fs_info)
2262 spin_lock_init(&fs_info->qgroup_lock);
2263 mutex_init(&fs_info->qgroup_ioctl_lock);
2264 fs_info->qgroup_tree = RB_ROOT;
2265 INIT_LIST_HEAD(&fs_info->dirty_qgroups);
2266 fs_info->qgroup_seq = 1;
2267 fs_info->qgroup_ulist = NULL;
2268 fs_info->qgroup_rescan_running = false;
2269 mutex_init(&fs_info->qgroup_rescan_lock);
2272 static int btrfs_init_workqueues(struct btrfs_fs_info *fs_info)
2274 u32 max_active = fs_info->thread_pool_size;
2275 unsigned int flags = WQ_MEM_RECLAIM | WQ_FREEZABLE | WQ_UNBOUND;
2278 btrfs_alloc_workqueue(fs_info, "worker", flags, max_active, 16);
2279 fs_info->hipri_workers =
2280 btrfs_alloc_workqueue(fs_info, "worker-high",
2281 flags | WQ_HIGHPRI, max_active, 16);
2283 fs_info->delalloc_workers =
2284 btrfs_alloc_workqueue(fs_info, "delalloc",
2285 flags, max_active, 2);
2287 fs_info->flush_workers =
2288 btrfs_alloc_workqueue(fs_info, "flush_delalloc",
2289 flags, max_active, 0);
2291 fs_info->caching_workers =
2292 btrfs_alloc_workqueue(fs_info, "cache", flags, max_active, 0);
2294 fs_info->fixup_workers =
2295 btrfs_alloc_workqueue(fs_info, "fixup", flags, 1, 0);
2297 fs_info->endio_workers =
2298 alloc_workqueue("btrfs-endio", flags, max_active);
2299 fs_info->endio_meta_workers =
2300 alloc_workqueue("btrfs-endio-meta", flags, max_active);
2301 fs_info->endio_raid56_workers =
2302 alloc_workqueue("btrfs-endio-raid56", flags, max_active);
2303 fs_info->rmw_workers = alloc_workqueue("btrfs-rmw", flags, max_active);
2304 fs_info->endio_write_workers =
2305 btrfs_alloc_workqueue(fs_info, "endio-write", flags,
2307 fs_info->compressed_write_workers =
2308 alloc_workqueue("btrfs-compressed-write", flags, max_active);
2309 fs_info->endio_freespace_worker =
2310 btrfs_alloc_workqueue(fs_info, "freespace-write", flags,
2312 fs_info->delayed_workers =
2313 btrfs_alloc_workqueue(fs_info, "delayed-meta", flags,
2315 fs_info->qgroup_rescan_workers =
2316 btrfs_alloc_workqueue(fs_info, "qgroup-rescan", flags, 1, 0);
2317 fs_info->discard_ctl.discard_workers =
2318 alloc_workqueue("btrfs_discard", WQ_UNBOUND | WQ_FREEZABLE, 1);
2320 if (!(fs_info->workers && fs_info->hipri_workers &&
2321 fs_info->delalloc_workers && fs_info->flush_workers &&
2322 fs_info->endio_workers && fs_info->endio_meta_workers &&
2323 fs_info->compressed_write_workers &&
2324 fs_info->endio_write_workers && fs_info->endio_raid56_workers &&
2325 fs_info->endio_freespace_worker && fs_info->rmw_workers &&
2326 fs_info->caching_workers && fs_info->fixup_workers &&
2327 fs_info->delayed_workers && fs_info->qgroup_rescan_workers &&
2328 fs_info->discard_ctl.discard_workers)) {
2335 static int btrfs_init_csum_hash(struct btrfs_fs_info *fs_info, u16 csum_type)
2337 struct crypto_shash *csum_shash;
2338 const char *csum_driver = btrfs_super_csum_driver(csum_type);
2340 csum_shash = crypto_alloc_shash(csum_driver, 0, 0);
2342 if (IS_ERR(csum_shash)) {
2343 btrfs_err(fs_info, "error allocating %s hash for checksum",
2345 return PTR_ERR(csum_shash);
2348 fs_info->csum_shash = csum_shash;
2350 btrfs_info(fs_info, "using %s (%s) checksum algorithm",
2351 btrfs_super_csum_name(csum_type),
2352 crypto_shash_driver_name(csum_shash));
2356 static int btrfs_replay_log(struct btrfs_fs_info *fs_info,
2357 struct btrfs_fs_devices *fs_devices)
2360 struct btrfs_root *log_tree_root;
2361 struct btrfs_super_block *disk_super = fs_info->super_copy;
2362 u64 bytenr = btrfs_super_log_root(disk_super);
2363 int level = btrfs_super_log_root_level(disk_super);
2365 if (fs_devices->rw_devices == 0) {
2366 btrfs_warn(fs_info, "log replay required on RO media");
2370 log_tree_root = btrfs_alloc_root(fs_info, BTRFS_TREE_LOG_OBJECTID,
2375 log_tree_root->node = read_tree_block(fs_info, bytenr,
2376 BTRFS_TREE_LOG_OBJECTID,
2377 fs_info->generation + 1, level,
2379 if (IS_ERR(log_tree_root->node)) {
2380 btrfs_warn(fs_info, "failed to read log tree");
2381 ret = PTR_ERR(log_tree_root->node);
2382 log_tree_root->node = NULL;
2383 btrfs_put_root(log_tree_root);
2386 if (!extent_buffer_uptodate(log_tree_root->node)) {
2387 btrfs_err(fs_info, "failed to read log tree");
2388 btrfs_put_root(log_tree_root);
2392 /* returns with log_tree_root freed on success */
2393 ret = btrfs_recover_log_trees(log_tree_root);
2395 btrfs_handle_fs_error(fs_info, ret,
2396 "Failed to recover log tree");
2397 btrfs_put_root(log_tree_root);
2401 if (sb_rdonly(fs_info->sb)) {
2402 ret = btrfs_commit_super(fs_info);
2410 static int load_global_roots_objectid(struct btrfs_root *tree_root,
2411 struct btrfs_path *path, u64 objectid,
2414 struct btrfs_fs_info *fs_info = tree_root->fs_info;
2415 struct btrfs_root *root;
2416 u64 max_global_id = 0;
2418 struct btrfs_key key = {
2419 .objectid = objectid,
2420 .type = BTRFS_ROOT_ITEM_KEY,
2425 /* If we have IGNOREDATACSUMS skip loading these roots. */
2426 if (objectid == BTRFS_CSUM_TREE_OBJECTID &&
2427 btrfs_test_opt(fs_info, IGNOREDATACSUMS)) {
2428 set_bit(BTRFS_FS_STATE_NO_CSUMS, &fs_info->fs_state);
2433 ret = btrfs_search_slot(NULL, tree_root, &key, path, 0, 0);
2437 if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
2438 ret = btrfs_next_leaf(tree_root, path);
2447 btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
2448 if (key.objectid != objectid)
2450 btrfs_release_path(path);
2453 * Just worry about this for extent tree, it'll be the same for
2456 if (objectid == BTRFS_EXTENT_TREE_OBJECTID)
2457 max_global_id = max(max_global_id, key.offset);
2460 root = read_tree_root_path(tree_root, path, &key);
2462 if (!btrfs_test_opt(fs_info, IGNOREBADROOTS))
2463 ret = PTR_ERR(root);
2466 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2467 ret = btrfs_global_root_insert(root);
2469 btrfs_put_root(root);
2474 btrfs_release_path(path);
2476 if (objectid == BTRFS_EXTENT_TREE_OBJECTID)
2477 fs_info->nr_global_roots = max_global_id + 1;
2479 if (!found || ret) {
2480 if (objectid == BTRFS_CSUM_TREE_OBJECTID)
2481 set_bit(BTRFS_FS_STATE_NO_CSUMS, &fs_info->fs_state);
2483 if (!btrfs_test_opt(fs_info, IGNOREBADROOTS))
2484 ret = ret ? ret : -ENOENT;
2487 btrfs_err(fs_info, "failed to load root %s", name);
2492 static int load_global_roots(struct btrfs_root *tree_root)
2494 struct btrfs_path *path;
2497 path = btrfs_alloc_path();
2501 ret = load_global_roots_objectid(tree_root, path,
2502 BTRFS_EXTENT_TREE_OBJECTID, "extent");
2505 ret = load_global_roots_objectid(tree_root, path,
2506 BTRFS_CSUM_TREE_OBJECTID, "csum");
2509 if (!btrfs_fs_compat_ro(tree_root->fs_info, FREE_SPACE_TREE))
2511 ret = load_global_roots_objectid(tree_root, path,
2512 BTRFS_FREE_SPACE_TREE_OBJECTID,
2515 btrfs_free_path(path);
2519 static int btrfs_read_roots(struct btrfs_fs_info *fs_info)
2521 struct btrfs_root *tree_root = fs_info->tree_root;
2522 struct btrfs_root *root;
2523 struct btrfs_key location;
2526 BUG_ON(!fs_info->tree_root);
2528 ret = load_global_roots(tree_root);
2532 location.objectid = BTRFS_DEV_TREE_OBJECTID;
2533 location.type = BTRFS_ROOT_ITEM_KEY;
2534 location.offset = 0;
2536 root = btrfs_read_tree_root(tree_root, &location);
2538 if (!btrfs_test_opt(fs_info, IGNOREBADROOTS)) {
2539 ret = PTR_ERR(root);
2543 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2544 fs_info->dev_root = root;
2546 /* Initialize fs_info for all devices in any case */
2547 btrfs_init_devices_late(fs_info);
2550 * This tree can share blocks with some other fs tree during relocation
2551 * and we need a proper setup by btrfs_get_fs_root
2553 root = btrfs_get_fs_root(tree_root->fs_info,
2554 BTRFS_DATA_RELOC_TREE_OBJECTID, true);
2556 if (!btrfs_test_opt(fs_info, IGNOREBADROOTS)) {
2557 ret = PTR_ERR(root);
2561 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2562 fs_info->data_reloc_root = root;
2565 location.objectid = BTRFS_QUOTA_TREE_OBJECTID;
2566 root = btrfs_read_tree_root(tree_root, &location);
2567 if (!IS_ERR(root)) {
2568 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2569 set_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags);
2570 fs_info->quota_root = root;
2573 location.objectid = BTRFS_UUID_TREE_OBJECTID;
2574 root = btrfs_read_tree_root(tree_root, &location);
2576 if (!btrfs_test_opt(fs_info, IGNOREBADROOTS)) {
2577 ret = PTR_ERR(root);
2582 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
2583 fs_info->uuid_root = root;
2588 btrfs_warn(fs_info, "failed to read root (objectid=%llu): %d",
2589 location.objectid, ret);
2594 * Real super block validation
2595 * NOTE: super csum type and incompat features will not be checked here.
2597 * @sb: super block to check
2598 * @mirror_num: the super block number to check its bytenr:
2599 * 0 the primary (1st) sb
2600 * 1, 2 2nd and 3rd backup copy
2601 * -1 skip bytenr check
2603 static int validate_super(struct btrfs_fs_info *fs_info,
2604 struct btrfs_super_block *sb, int mirror_num)
2606 u64 nodesize = btrfs_super_nodesize(sb);
2607 u64 sectorsize = btrfs_super_sectorsize(sb);
2610 if (btrfs_super_magic(sb) != BTRFS_MAGIC) {
2611 btrfs_err(fs_info, "no valid FS found");
2614 if (btrfs_super_flags(sb) & ~BTRFS_SUPER_FLAG_SUPP) {
2615 btrfs_err(fs_info, "unrecognized or unsupported super flag: %llu",
2616 btrfs_super_flags(sb) & ~BTRFS_SUPER_FLAG_SUPP);
2619 if (btrfs_super_root_level(sb) >= BTRFS_MAX_LEVEL) {
2620 btrfs_err(fs_info, "tree_root level too big: %d >= %d",
2621 btrfs_super_root_level(sb), BTRFS_MAX_LEVEL);
2624 if (btrfs_super_chunk_root_level(sb) >= BTRFS_MAX_LEVEL) {
2625 btrfs_err(fs_info, "chunk_root level too big: %d >= %d",
2626 btrfs_super_chunk_root_level(sb), BTRFS_MAX_LEVEL);
2629 if (btrfs_super_log_root_level(sb) >= BTRFS_MAX_LEVEL) {
2630 btrfs_err(fs_info, "log_root level too big: %d >= %d",
2631 btrfs_super_log_root_level(sb), BTRFS_MAX_LEVEL);
2636 * Check sectorsize and nodesize first, other check will need it.
2637 * Check all possible sectorsize(4K, 8K, 16K, 32K, 64K) here.
2639 if (!is_power_of_2(sectorsize) || sectorsize < 4096 ||
2640 sectorsize > BTRFS_MAX_METADATA_BLOCKSIZE) {
2641 btrfs_err(fs_info, "invalid sectorsize %llu", sectorsize);
2646 * We only support at most two sectorsizes: 4K and PAGE_SIZE.
2648 * We can support 16K sectorsize with 64K page size without problem,
2649 * but such sectorsize/pagesize combination doesn't make much sense.
2650 * 4K will be our future standard, PAGE_SIZE is supported from the very
2653 if (sectorsize > PAGE_SIZE || (sectorsize != SZ_4K && sectorsize != PAGE_SIZE)) {
2655 "sectorsize %llu not yet supported for page size %lu",
2656 sectorsize, PAGE_SIZE);
2660 if (!is_power_of_2(nodesize) || nodesize < sectorsize ||
2661 nodesize > BTRFS_MAX_METADATA_BLOCKSIZE) {
2662 btrfs_err(fs_info, "invalid nodesize %llu", nodesize);
2665 if (nodesize != le32_to_cpu(sb->__unused_leafsize)) {
2666 btrfs_err(fs_info, "invalid leafsize %u, should be %llu",
2667 le32_to_cpu(sb->__unused_leafsize), nodesize);
2671 /* Root alignment check */
2672 if (!IS_ALIGNED(btrfs_super_root(sb), sectorsize)) {
2673 btrfs_warn(fs_info, "tree_root block unaligned: %llu",
2674 btrfs_super_root(sb));
2677 if (!IS_ALIGNED(btrfs_super_chunk_root(sb), sectorsize)) {
2678 btrfs_warn(fs_info, "chunk_root block unaligned: %llu",
2679 btrfs_super_chunk_root(sb));
2682 if (!IS_ALIGNED(btrfs_super_log_root(sb), sectorsize)) {
2683 btrfs_warn(fs_info, "log_root block unaligned: %llu",
2684 btrfs_super_log_root(sb));
2688 if (memcmp(fs_info->fs_devices->fsid, fs_info->super_copy->fsid,
2691 "superblock fsid doesn't match fsid of fs_devices: %pU != %pU",
2692 fs_info->super_copy->fsid, fs_info->fs_devices->fsid);
2696 if (btrfs_fs_incompat(fs_info, METADATA_UUID) &&
2697 memcmp(fs_info->fs_devices->metadata_uuid,
2698 fs_info->super_copy->metadata_uuid, BTRFS_FSID_SIZE)) {
2700 "superblock metadata_uuid doesn't match metadata uuid of fs_devices: %pU != %pU",
2701 fs_info->super_copy->metadata_uuid,
2702 fs_info->fs_devices->metadata_uuid);
2706 if (memcmp(fs_info->fs_devices->metadata_uuid, sb->dev_item.fsid,
2707 BTRFS_FSID_SIZE) != 0) {
2709 "dev_item UUID does not match metadata fsid: %pU != %pU",
2710 fs_info->fs_devices->metadata_uuid, sb->dev_item.fsid);
2715 * Hint to catch really bogus numbers, bitflips or so, more exact checks are
2718 if (btrfs_super_bytes_used(sb) < 6 * btrfs_super_nodesize(sb)) {
2719 btrfs_err(fs_info, "bytes_used is too small %llu",
2720 btrfs_super_bytes_used(sb));
2723 if (!is_power_of_2(btrfs_super_stripesize(sb))) {
2724 btrfs_err(fs_info, "invalid stripesize %u",
2725 btrfs_super_stripesize(sb));
2728 if (btrfs_super_num_devices(sb) > (1UL << 31))
2729 btrfs_warn(fs_info, "suspicious number of devices: %llu",
2730 btrfs_super_num_devices(sb));
2731 if (btrfs_super_num_devices(sb) == 0) {
2732 btrfs_err(fs_info, "number of devices is 0");
2736 if (mirror_num >= 0 &&
2737 btrfs_super_bytenr(sb) != btrfs_sb_offset(mirror_num)) {
2738 btrfs_err(fs_info, "super offset mismatch %llu != %u",
2739 btrfs_super_bytenr(sb), BTRFS_SUPER_INFO_OFFSET);
2744 * Obvious sys_chunk_array corruptions, it must hold at least one key
2747 if (btrfs_super_sys_array_size(sb) > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) {
2748 btrfs_err(fs_info, "system chunk array too big %u > %u",
2749 btrfs_super_sys_array_size(sb),
2750 BTRFS_SYSTEM_CHUNK_ARRAY_SIZE);
2753 if (btrfs_super_sys_array_size(sb) < sizeof(struct btrfs_disk_key)
2754 + sizeof(struct btrfs_chunk)) {
2755 btrfs_err(fs_info, "system chunk array too small %u < %zu",
2756 btrfs_super_sys_array_size(sb),
2757 sizeof(struct btrfs_disk_key)
2758 + sizeof(struct btrfs_chunk));
2763 * The generation is a global counter, we'll trust it more than the others
2764 * but it's still possible that it's the one that's wrong.
2766 if (btrfs_super_generation(sb) < btrfs_super_chunk_root_generation(sb))
2768 "suspicious: generation < chunk_root_generation: %llu < %llu",
2769 btrfs_super_generation(sb),
2770 btrfs_super_chunk_root_generation(sb));
2771 if (btrfs_super_generation(sb) < btrfs_super_cache_generation(sb)
2772 && btrfs_super_cache_generation(sb) != (u64)-1)
2774 "suspicious: generation < cache_generation: %llu < %llu",
2775 btrfs_super_generation(sb),
2776 btrfs_super_cache_generation(sb));
2782 * Validation of super block at mount time.
2783 * Some checks already done early at mount time, like csum type and incompat
2784 * flags will be skipped.
2786 static int btrfs_validate_mount_super(struct btrfs_fs_info *fs_info)
2788 return validate_super(fs_info, fs_info->super_copy, 0);
2792 * Validation of super block at write time.
2793 * Some checks like bytenr check will be skipped as their values will be
2795 * Extra checks like csum type and incompat flags will be done here.
2797 static int btrfs_validate_write_super(struct btrfs_fs_info *fs_info,
2798 struct btrfs_super_block *sb)
2802 ret = validate_super(fs_info, sb, -1);
2805 if (!btrfs_supported_super_csum(btrfs_super_csum_type(sb))) {
2807 btrfs_err(fs_info, "invalid csum type, has %u want %u",
2808 btrfs_super_csum_type(sb), BTRFS_CSUM_TYPE_CRC32);
2811 if (btrfs_super_incompat_flags(sb) & ~BTRFS_FEATURE_INCOMPAT_SUPP) {
2814 "invalid incompat flags, has 0x%llx valid mask 0x%llx",
2815 btrfs_super_incompat_flags(sb),
2816 (unsigned long long)BTRFS_FEATURE_INCOMPAT_SUPP);
2822 "super block corruption detected before writing it to disk");
2826 static int load_super_root(struct btrfs_root *root, u64 bytenr, u64 gen, int level)
2830 root->node = read_tree_block(root->fs_info, bytenr,
2831 root->root_key.objectid, gen, level, NULL);
2832 if (IS_ERR(root->node)) {
2833 ret = PTR_ERR(root->node);
2837 if (!extent_buffer_uptodate(root->node)) {
2838 free_extent_buffer(root->node);
2843 btrfs_set_root_node(&root->root_item, root->node);
2844 root->commit_root = btrfs_root_node(root);
2845 btrfs_set_root_refs(&root->root_item, 1);
2849 static int load_important_roots(struct btrfs_fs_info *fs_info)
2851 struct btrfs_super_block *sb = fs_info->super_copy;
2855 bytenr = btrfs_super_root(sb);
2856 gen = btrfs_super_generation(sb);
2857 level = btrfs_super_root_level(sb);
2858 ret = load_super_root(fs_info->tree_root, bytenr, gen, level);
2860 btrfs_warn(fs_info, "couldn't read tree root");
2864 if (!btrfs_fs_incompat(fs_info, EXTENT_TREE_V2))
2867 bytenr = btrfs_super_block_group_root(sb);
2868 gen = btrfs_super_block_group_root_generation(sb);
2869 level = btrfs_super_block_group_root_level(sb);
2870 ret = load_super_root(fs_info->block_group_root, bytenr, gen, level);
2872 btrfs_warn(fs_info, "couldn't read block group root");
2876 static int __cold init_tree_roots(struct btrfs_fs_info *fs_info)
2878 int backup_index = find_newest_super_backup(fs_info);
2879 struct btrfs_super_block *sb = fs_info->super_copy;
2880 struct btrfs_root *tree_root = fs_info->tree_root;
2881 bool handle_error = false;
2885 if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) {
2886 struct btrfs_root *root;
2888 root = btrfs_alloc_root(fs_info, BTRFS_BLOCK_GROUP_TREE_OBJECTID,
2892 fs_info->block_group_root = root;
2895 for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
2897 if (!IS_ERR(tree_root->node))
2898 free_extent_buffer(tree_root->node);
2899 tree_root->node = NULL;
2901 if (!btrfs_test_opt(fs_info, USEBACKUPROOT))
2904 free_root_pointers(fs_info, 0);
2907 * Don't use the log in recovery mode, it won't be
2910 btrfs_set_super_log_root(sb, 0);
2912 /* We can't trust the free space cache either */
2913 btrfs_set_opt(fs_info->mount_opt, CLEAR_CACHE);
2915 ret = read_backup_root(fs_info, i);
2921 ret = load_important_roots(fs_info);
2923 handle_error = true;
2928 * No need to hold btrfs_root::objectid_mutex since the fs
2929 * hasn't been fully initialised and we are the only user
2931 ret = btrfs_init_root_free_objectid(tree_root);
2933 handle_error = true;
2937 ASSERT(tree_root->free_objectid <= BTRFS_LAST_FREE_OBJECTID);
2939 ret = btrfs_read_roots(fs_info);
2941 handle_error = true;
2945 /* All successful */
2946 fs_info->generation = btrfs_header_generation(tree_root->node);
2947 fs_info->last_trans_committed = fs_info->generation;
2948 fs_info->last_reloc_trans = 0;
2950 /* Always begin writing backup roots after the one being used */
2951 if (backup_index < 0) {
2952 fs_info->backup_root_index = 0;
2954 fs_info->backup_root_index = backup_index + 1;
2955 fs_info->backup_root_index %= BTRFS_NUM_BACKUP_ROOTS;
2963 void btrfs_init_fs_info(struct btrfs_fs_info *fs_info)
2965 INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC);
2966 INIT_RADIX_TREE(&fs_info->buffer_radix, GFP_ATOMIC);
2967 INIT_LIST_HEAD(&fs_info->trans_list);
2968 INIT_LIST_HEAD(&fs_info->dead_roots);
2969 INIT_LIST_HEAD(&fs_info->delayed_iputs);
2970 INIT_LIST_HEAD(&fs_info->delalloc_roots);
2971 INIT_LIST_HEAD(&fs_info->caching_block_groups);
2972 spin_lock_init(&fs_info->delalloc_root_lock);
2973 spin_lock_init(&fs_info->trans_lock);
2974 spin_lock_init(&fs_info->fs_roots_radix_lock);
2975 spin_lock_init(&fs_info->delayed_iput_lock);
2976 spin_lock_init(&fs_info->defrag_inodes_lock);
2977 spin_lock_init(&fs_info->super_lock);
2978 spin_lock_init(&fs_info->buffer_lock);
2979 spin_lock_init(&fs_info->unused_bgs_lock);
2980 spin_lock_init(&fs_info->treelog_bg_lock);
2981 spin_lock_init(&fs_info->zone_active_bgs_lock);
2982 spin_lock_init(&fs_info->relocation_bg_lock);
2983 rwlock_init(&fs_info->tree_mod_log_lock);
2984 rwlock_init(&fs_info->global_root_lock);
2985 mutex_init(&fs_info->unused_bg_unpin_mutex);
2986 mutex_init(&fs_info->reclaim_bgs_lock);
2987 mutex_init(&fs_info->reloc_mutex);
2988 mutex_init(&fs_info->delalloc_root_mutex);
2989 mutex_init(&fs_info->zoned_meta_io_lock);
2990 mutex_init(&fs_info->zoned_data_reloc_io_lock);
2991 seqlock_init(&fs_info->profiles_lock);
2993 INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
2994 INIT_LIST_HEAD(&fs_info->space_info);
2995 INIT_LIST_HEAD(&fs_info->tree_mod_seq_list);
2996 INIT_LIST_HEAD(&fs_info->unused_bgs);
2997 INIT_LIST_HEAD(&fs_info->reclaim_bgs);
2998 INIT_LIST_HEAD(&fs_info->zone_active_bgs);
2999 #ifdef CONFIG_BTRFS_DEBUG
3000 INIT_LIST_HEAD(&fs_info->allocated_roots);
3001 INIT_LIST_HEAD(&fs_info->allocated_ebs);
3002 spin_lock_init(&fs_info->eb_leak_lock);
3004 extent_map_tree_init(&fs_info->mapping_tree);
3005 btrfs_init_block_rsv(&fs_info->global_block_rsv,
3006 BTRFS_BLOCK_RSV_GLOBAL);
3007 btrfs_init_block_rsv(&fs_info->trans_block_rsv, BTRFS_BLOCK_RSV_TRANS);
3008 btrfs_init_block_rsv(&fs_info->chunk_block_rsv, BTRFS_BLOCK_RSV_CHUNK);
3009 btrfs_init_block_rsv(&fs_info->empty_block_rsv, BTRFS_BLOCK_RSV_EMPTY);
3010 btrfs_init_block_rsv(&fs_info->delayed_block_rsv,
3011 BTRFS_BLOCK_RSV_DELOPS);
3012 btrfs_init_block_rsv(&fs_info->delayed_refs_rsv,
3013 BTRFS_BLOCK_RSV_DELREFS);
3015 atomic_set(&fs_info->async_delalloc_pages, 0);
3016 atomic_set(&fs_info->defrag_running, 0);
3017 atomic_set(&fs_info->nr_delayed_iputs, 0);
3018 atomic64_set(&fs_info->tree_mod_seq, 0);
3019 fs_info->global_root_tree = RB_ROOT;
3020 fs_info->max_inline = BTRFS_DEFAULT_MAX_INLINE;
3021 fs_info->metadata_ratio = 0;
3022 fs_info->defrag_inodes = RB_ROOT;
3023 atomic64_set(&fs_info->free_chunk_space, 0);
3024 fs_info->tree_mod_log = RB_ROOT;
3025 fs_info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL;
3026 fs_info->avg_delayed_ref_runtime = NSEC_PER_SEC >> 6; /* div by 64 */
3027 btrfs_init_ref_verify(fs_info);
3029 fs_info->thread_pool_size = min_t(unsigned long,
3030 num_online_cpus() + 2, 8);
3032 INIT_LIST_HEAD(&fs_info->ordered_roots);
3033 spin_lock_init(&fs_info->ordered_root_lock);
3035 btrfs_init_scrub(fs_info);
3036 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
3037 fs_info->check_integrity_print_mask = 0;
3039 btrfs_init_balance(fs_info);
3040 btrfs_init_async_reclaim_work(fs_info);
3042 rwlock_init(&fs_info->block_group_cache_lock);
3043 fs_info->block_group_cache_tree = RB_ROOT_CACHED;
3045 extent_io_tree_init(fs_info, &fs_info->excluded_extents,
3046 IO_TREE_FS_EXCLUDED_EXTENTS, NULL);
3048 mutex_init(&fs_info->ordered_operations_mutex);
3049 mutex_init(&fs_info->tree_log_mutex);
3050 mutex_init(&fs_info->chunk_mutex);
3051 mutex_init(&fs_info->transaction_kthread_mutex);
3052 mutex_init(&fs_info->cleaner_mutex);
3053 mutex_init(&fs_info->ro_block_group_mutex);
3054 init_rwsem(&fs_info->commit_root_sem);
3055 init_rwsem(&fs_info->cleanup_work_sem);
3056 init_rwsem(&fs_info->subvol_sem);
3057 sema_init(&fs_info->uuid_tree_rescan_sem, 1);
3059 btrfs_init_dev_replace_locks(fs_info);
3060 btrfs_init_qgroup(fs_info);
3061 btrfs_discard_init(fs_info);
3063 btrfs_init_free_cluster(&fs_info->meta_alloc_cluster);
3064 btrfs_init_free_cluster(&fs_info->data_alloc_cluster);
3066 init_waitqueue_head(&fs_info->transaction_throttle);
3067 init_waitqueue_head(&fs_info->transaction_wait);
3068 init_waitqueue_head(&fs_info->transaction_blocked_wait);
3069 init_waitqueue_head(&fs_info->async_submit_wait);
3070 init_waitqueue_head(&fs_info->delayed_iputs_wait);
3072 /* Usable values until the real ones are cached from the superblock */
3073 fs_info->nodesize = 4096;
3074 fs_info->sectorsize = 4096;
3075 fs_info->sectorsize_bits = ilog2(4096);
3076 fs_info->stripesize = 4096;
3078 fs_info->max_extent_size = BTRFS_MAX_EXTENT_SIZE;
3080 spin_lock_init(&fs_info->swapfile_pins_lock);
3081 fs_info->swapfile_pins = RB_ROOT;
3083 fs_info->bg_reclaim_threshold = BTRFS_DEFAULT_RECLAIM_THRESH;
3084 INIT_WORK(&fs_info->reclaim_bgs_work, btrfs_reclaim_bgs_work);
3087 static int init_mount_fs_info(struct btrfs_fs_info *fs_info, struct super_block *sb)
3092 sb->s_blocksize = BTRFS_BDEV_BLOCKSIZE;
3093 sb->s_blocksize_bits = blksize_bits(BTRFS_BDEV_BLOCKSIZE);
3095 ret = percpu_counter_init(&fs_info->ordered_bytes, 0, GFP_KERNEL);
3099 ret = percpu_counter_init(&fs_info->dirty_metadata_bytes, 0, GFP_KERNEL);
3103 fs_info->dirty_metadata_batch = PAGE_SIZE *
3104 (1 + ilog2(nr_cpu_ids));
3106 ret = percpu_counter_init(&fs_info->delalloc_bytes, 0, GFP_KERNEL);
3110 ret = percpu_counter_init(&fs_info->dev_replace.bio_counter, 0,
3115 fs_info->delayed_root = kmalloc(sizeof(struct btrfs_delayed_root),
3117 if (!fs_info->delayed_root)
3119 btrfs_init_delayed_root(fs_info->delayed_root);
3122 set_bit(BTRFS_FS_STATE_RO, &fs_info->fs_state);
3124 return btrfs_alloc_stripe_hash_table(fs_info);
3127 static int btrfs_uuid_rescan_kthread(void *data)
3129 struct btrfs_fs_info *fs_info = data;
3133 * 1st step is to iterate through the existing UUID tree and
3134 * to delete all entries that contain outdated data.
3135 * 2nd step is to add all missing entries to the UUID tree.
3137 ret = btrfs_uuid_tree_iterate(fs_info);
3140 btrfs_warn(fs_info, "iterating uuid_tree failed %d",
3142 up(&fs_info->uuid_tree_rescan_sem);
3145 return btrfs_uuid_scan_kthread(data);
3148 static int btrfs_check_uuid_tree(struct btrfs_fs_info *fs_info)
3150 struct task_struct *task;
3152 down(&fs_info->uuid_tree_rescan_sem);
3153 task = kthread_run(btrfs_uuid_rescan_kthread, fs_info, "btrfs-uuid");
3155 /* fs_info->update_uuid_tree_gen remains 0 in all error case */
3156 btrfs_warn(fs_info, "failed to start uuid_rescan task");
3157 up(&fs_info->uuid_tree_rescan_sem);
3158 return PTR_ERR(task);
3165 * Some options only have meaning at mount time and shouldn't persist across
3166 * remounts, or be displayed. Clear these at the end of mount and remount
3169 void btrfs_clear_oneshot_options(struct btrfs_fs_info *fs_info)
3171 btrfs_clear_opt(fs_info->mount_opt, USEBACKUPROOT);
3172 btrfs_clear_opt(fs_info->mount_opt, CLEAR_CACHE);
3176 * Mounting logic specific to read-write file systems. Shared by open_ctree
3177 * and btrfs_remount when remounting from read-only to read-write.
3179 int btrfs_start_pre_rw_mount(struct btrfs_fs_info *fs_info)
3182 const bool cache_opt = btrfs_test_opt(fs_info, SPACE_CACHE);
3183 bool clear_free_space_tree = false;
3185 if (btrfs_test_opt(fs_info, CLEAR_CACHE) &&
3186 btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
3187 clear_free_space_tree = true;
3188 } else if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE) &&
3189 !btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE_VALID)) {
3190 btrfs_warn(fs_info, "free space tree is invalid");
3191 clear_free_space_tree = true;
3194 if (clear_free_space_tree) {
3195 btrfs_info(fs_info, "clearing free space tree");
3196 ret = btrfs_clear_free_space_tree(fs_info);
3199 "failed to clear free space tree: %d", ret);
3205 * btrfs_find_orphan_roots() is responsible for finding all the dead
3206 * roots (with 0 refs), flag them with BTRFS_ROOT_DEAD_TREE and load
3207 * them into the fs_info->fs_roots_radix tree. This must be done before
3208 * calling btrfs_orphan_cleanup() on the tree root. If we don't do it
3209 * first, then btrfs_orphan_cleanup() will delete a dead root's orphan
3210 * item before the root's tree is deleted - this means that if we unmount
3211 * or crash before the deletion completes, on the next mount we will not
3212 * delete what remains of the tree because the orphan item does not
3213 * exists anymore, which is what tells us we have a pending deletion.
3215 ret = btrfs_find_orphan_roots(fs_info);
3219 ret = btrfs_cleanup_fs_roots(fs_info);
3223 down_read(&fs_info->cleanup_work_sem);
3224 if ((ret = btrfs_orphan_cleanup(fs_info->fs_root)) ||
3225 (ret = btrfs_orphan_cleanup(fs_info->tree_root))) {
3226 up_read(&fs_info->cleanup_work_sem);
3229 up_read(&fs_info->cleanup_work_sem);
3231 mutex_lock(&fs_info->cleaner_mutex);
3232 ret = btrfs_recover_relocation(fs_info);
3233 mutex_unlock(&fs_info->cleaner_mutex);
3235 btrfs_warn(fs_info, "failed to recover relocation: %d", ret);
3239 if (btrfs_test_opt(fs_info, FREE_SPACE_TREE) &&
3240 !btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) {
3241 btrfs_info(fs_info, "creating free space tree");
3242 ret = btrfs_create_free_space_tree(fs_info);
3245 "failed to create free space tree: %d", ret);
3250 if (cache_opt != btrfs_free_space_cache_v1_active(fs_info)) {
3251 ret = btrfs_set_free_space_cache_v1_active(fs_info, cache_opt);
3256 ret = btrfs_resume_balance_async(fs_info);
3260 ret = btrfs_resume_dev_replace_async(fs_info);
3262 btrfs_warn(fs_info, "failed to resume dev_replace");
3266 btrfs_qgroup_rescan_resume(fs_info);
3268 if (!fs_info->uuid_root) {
3269 btrfs_info(fs_info, "creating UUID tree");
3270 ret = btrfs_create_uuid_tree(fs_info);
3273 "failed to create the UUID tree %d", ret);
3282 int __cold open_ctree(struct super_block *sb, struct btrfs_fs_devices *fs_devices,
3291 struct btrfs_super_block *disk_super;
3292 struct btrfs_fs_info *fs_info = btrfs_sb(sb);
3293 struct btrfs_root *tree_root;
3294 struct btrfs_root *chunk_root;
3299 ret = init_mount_fs_info(fs_info, sb);
3305 /* These need to be init'ed before we start creating inodes and such. */
3306 tree_root = btrfs_alloc_root(fs_info, BTRFS_ROOT_TREE_OBJECTID,
3308 fs_info->tree_root = tree_root;
3309 chunk_root = btrfs_alloc_root(fs_info, BTRFS_CHUNK_TREE_OBJECTID,
3311 fs_info->chunk_root = chunk_root;
3312 if (!tree_root || !chunk_root) {
3317 fs_info->btree_inode = new_inode(sb);
3318 if (!fs_info->btree_inode) {
3322 mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
3323 btrfs_init_btree_inode(fs_info);
3325 invalidate_bdev(fs_devices->latest_dev->bdev);
3328 * Read super block and check the signature bytes only
3330 disk_super = btrfs_read_dev_super(fs_devices->latest_dev->bdev);
3331 if (IS_ERR(disk_super)) {
3332 err = PTR_ERR(disk_super);
3337 * Verify the type first, if that or the checksum value are
3338 * corrupted, we'll find out
3340 csum_type = btrfs_super_csum_type(disk_super);
3341 if (!btrfs_supported_super_csum(csum_type)) {
3342 btrfs_err(fs_info, "unsupported checksum algorithm: %u",
3345 btrfs_release_disk_super(disk_super);
3349 fs_info->csum_size = btrfs_super_csum_size(disk_super);
3351 ret = btrfs_init_csum_hash(fs_info, csum_type);
3354 btrfs_release_disk_super(disk_super);
3359 * We want to check superblock checksum, the type is stored inside.
3360 * Pass the whole disk block of size BTRFS_SUPER_INFO_SIZE (4k).
3362 if (btrfs_check_super_csum(fs_info, (u8 *)disk_super)) {
3363 btrfs_err(fs_info, "superblock checksum mismatch");
3365 btrfs_release_disk_super(disk_super);
3370 * super_copy is zeroed at allocation time and we never touch the
3371 * following bytes up to INFO_SIZE, the checksum is calculated from
3372 * the whole block of INFO_SIZE
3374 memcpy(fs_info->super_copy, disk_super, sizeof(*fs_info->super_copy));
3375 btrfs_release_disk_super(disk_super);
3377 disk_super = fs_info->super_copy;
3380 features = btrfs_super_flags(disk_super);
3381 if (features & BTRFS_SUPER_FLAG_CHANGING_FSID_V2) {
3382 features &= ~BTRFS_SUPER_FLAG_CHANGING_FSID_V2;
3383 btrfs_set_super_flags(disk_super, features);
3385 "found metadata UUID change in progress flag, clearing");
3388 memcpy(fs_info->super_for_commit, fs_info->super_copy,
3389 sizeof(*fs_info->super_for_commit));
3391 ret = btrfs_validate_mount_super(fs_info);
3393 btrfs_err(fs_info, "superblock contains fatal errors");
3398 if (!btrfs_super_root(disk_super))
3401 /* check FS state, whether FS is broken. */
3402 if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_ERROR)
3403 set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state);
3406 * In the long term, we'll store the compression type in the super
3407 * block, and it'll be used for per file compression control.
3409 fs_info->compress_type = BTRFS_COMPRESS_ZLIB;
3412 /* Set up fs_info before parsing mount options */
3413 nodesize = btrfs_super_nodesize(disk_super);
3414 sectorsize = btrfs_super_sectorsize(disk_super);
3415 stripesize = sectorsize;
3416 fs_info->dirty_metadata_batch = nodesize * (1 + ilog2(nr_cpu_ids));
3417 fs_info->delalloc_batch = sectorsize * 512 * (1 + ilog2(nr_cpu_ids));
3419 fs_info->nodesize = nodesize;
3420 fs_info->sectorsize = sectorsize;
3421 fs_info->sectorsize_bits = ilog2(sectorsize);
3422 fs_info->csums_per_leaf = BTRFS_MAX_ITEM_SIZE(fs_info) / fs_info->csum_size;
3423 fs_info->stripesize = stripesize;
3425 ret = btrfs_parse_options(fs_info, options, sb->s_flags);
3431 features = btrfs_super_incompat_flags(disk_super) &
3432 ~BTRFS_FEATURE_INCOMPAT_SUPP;
3435 "cannot mount because of unsupported optional features (0x%llx)",
3441 features = btrfs_super_incompat_flags(disk_super);
3442 features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
3443 if (fs_info->compress_type == BTRFS_COMPRESS_LZO)
3444 features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO;
3445 else if (fs_info->compress_type == BTRFS_COMPRESS_ZSTD)
3446 features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD;
3449 * Flag our filesystem as having big metadata blocks if they are bigger
3450 * than the page size.
3452 if (btrfs_super_nodesize(disk_super) > PAGE_SIZE)
3453 features |= BTRFS_FEATURE_INCOMPAT_BIG_METADATA;
3456 * mixed block groups end up with duplicate but slightly offset
3457 * extent buffers for the same range. It leads to corruptions
3459 if ((features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) &&
3460 (sectorsize != nodesize)) {
3462 "unequal nodesize/sectorsize (%u != %u) are not allowed for mixed block groups",
3463 nodesize, sectorsize);
3468 * Needn't use the lock because there is no other task which will
3471 btrfs_set_super_incompat_flags(disk_super, features);
3473 features = btrfs_super_compat_ro_flags(disk_super) &
3474 ~BTRFS_FEATURE_COMPAT_RO_SUPP;
3475 if (!sb_rdonly(sb) && features) {
3477 "cannot mount read-write because of unsupported optional features (0x%llx)",
3483 * We have unsupported RO compat features, although RO mounted, we
3484 * should not cause any metadata write, including log replay.
3485 * Or we could screw up whatever the new feature requires.
3487 if (unlikely(features && btrfs_super_log_root(disk_super) &&
3488 !btrfs_test_opt(fs_info, NOLOGREPLAY))) {
3490 "cannot replay dirty log with unsupported compat_ro features (0x%llx), try rescue=nologreplay",
3497 if (sectorsize < PAGE_SIZE) {
3498 struct btrfs_subpage_info *subpage_info;
3501 * V1 space cache has some hardcoded PAGE_SIZE usage, and is
3502 * going to be deprecated.
3504 * Force to use v2 cache for subpage case.
3506 btrfs_clear_opt(fs_info->mount_opt, SPACE_CACHE);
3507 btrfs_set_and_info(fs_info, FREE_SPACE_TREE,
3508 "forcing free space tree for sector size %u with page size %lu",
3509 sectorsize, PAGE_SIZE);
3512 "read-write for sector size %u with page size %lu is experimental",
3513 sectorsize, PAGE_SIZE);
3514 subpage_info = kzalloc(sizeof(*subpage_info), GFP_KERNEL);
3517 btrfs_init_subpage_info(subpage_info, sectorsize);
3518 fs_info->subpage_info = subpage_info;
3521 ret = btrfs_init_workqueues(fs_info);
3524 goto fail_sb_buffer;
3527 sb->s_bdi->ra_pages *= btrfs_super_num_devices(disk_super);
3528 sb->s_bdi->ra_pages = max(sb->s_bdi->ra_pages, SZ_4M / PAGE_SIZE);
3530 sb->s_blocksize = sectorsize;
3531 sb->s_blocksize_bits = blksize_bits(sectorsize);
3532 memcpy(&sb->s_uuid, fs_info->fs_devices->fsid, BTRFS_FSID_SIZE);
3534 mutex_lock(&fs_info->chunk_mutex);
3535 ret = btrfs_read_sys_array(fs_info);
3536 mutex_unlock(&fs_info->chunk_mutex);
3538 btrfs_err(fs_info, "failed to read the system array: %d", ret);
3539 goto fail_sb_buffer;
3542 generation = btrfs_super_chunk_root_generation(disk_super);
3543 level = btrfs_super_chunk_root_level(disk_super);
3544 ret = load_super_root(chunk_root, btrfs_super_chunk_root(disk_super),
3547 btrfs_err(fs_info, "failed to read chunk root");
3548 goto fail_tree_roots;
3551 read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
3552 offsetof(struct btrfs_header, chunk_tree_uuid),
3555 ret = btrfs_read_chunk_tree(fs_info);
3557 btrfs_err(fs_info, "failed to read chunk tree: %d", ret);
3558 goto fail_tree_roots;
3562 * At this point we know all the devices that make this filesystem,
3563 * including the seed devices but we don't know yet if the replace
3564 * target is required. So free devices that are not part of this
3565 * filesystem but skip the replace target device which is checked
3566 * below in btrfs_init_dev_replace().
3568 btrfs_free_extra_devids(fs_devices);
3569 if (!fs_devices->latest_dev->bdev) {
3570 btrfs_err(fs_info, "failed to read devices");
3571 goto fail_tree_roots;
3574 ret = init_tree_roots(fs_info);
3576 goto fail_tree_roots;
3579 * Get zone type information of zoned block devices. This will also
3580 * handle emulation of a zoned filesystem if a regular device has the
3581 * zoned incompat feature flag set.
3583 ret = btrfs_get_dev_zone_info_all_devices(fs_info);
3586 "zoned: failed to read device zone info: %d",
3588 goto fail_block_groups;
3592 * If we have a uuid root and we're not being told to rescan we need to
3593 * check the generation here so we can set the
3594 * BTRFS_FS_UPDATE_UUID_TREE_GEN bit. Otherwise we could commit the
3595 * transaction during a balance or the log replay without updating the
3596 * uuid generation, and then if we crash we would rescan the uuid tree,
3597 * even though it was perfectly fine.
3599 if (fs_info->uuid_root && !btrfs_test_opt(fs_info, RESCAN_UUID_TREE) &&
3600 fs_info->generation == btrfs_super_uuid_tree_generation(disk_super))
3601 set_bit(BTRFS_FS_UPDATE_UUID_TREE_GEN, &fs_info->flags);
3603 ret = btrfs_verify_dev_extents(fs_info);
3606 "failed to verify dev extents against chunks: %d",
3608 goto fail_block_groups;
3610 ret = btrfs_recover_balance(fs_info);
3612 btrfs_err(fs_info, "failed to recover balance: %d", ret);
3613 goto fail_block_groups;
3616 ret = btrfs_init_dev_stats(fs_info);
3618 btrfs_err(fs_info, "failed to init dev_stats: %d", ret);
3619 goto fail_block_groups;
3622 ret = btrfs_init_dev_replace(fs_info);
3624 btrfs_err(fs_info, "failed to init dev_replace: %d", ret);
3625 goto fail_block_groups;
3628 ret = btrfs_check_zoned_mode(fs_info);
3630 btrfs_err(fs_info, "failed to initialize zoned mode: %d",
3632 goto fail_block_groups;
3635 ret = btrfs_sysfs_add_fsid(fs_devices);
3637 btrfs_err(fs_info, "failed to init sysfs fsid interface: %d",
3639 goto fail_block_groups;
3642 ret = btrfs_sysfs_add_mounted(fs_info);
3644 btrfs_err(fs_info, "failed to init sysfs interface: %d", ret);
3645 goto fail_fsdev_sysfs;
3648 ret = btrfs_init_space_info(fs_info);
3650 btrfs_err(fs_info, "failed to initialize space info: %d", ret);
3654 ret = btrfs_read_block_groups(fs_info);
3656 btrfs_err(fs_info, "failed to read block groups: %d", ret);
3660 btrfs_free_zone_cache(fs_info);
3662 if (!sb_rdonly(sb) && fs_info->fs_devices->missing_devices &&
3663 !btrfs_check_rw_degradable(fs_info, NULL)) {
3665 "writable mount is not allowed due to too many missing devices");
3669 fs_info->cleaner_kthread = kthread_run(cleaner_kthread, fs_info,
3671 if (IS_ERR(fs_info->cleaner_kthread))
3674 fs_info->transaction_kthread = kthread_run(transaction_kthread,
3676 "btrfs-transaction");
3677 if (IS_ERR(fs_info->transaction_kthread))
3680 if (!btrfs_test_opt(fs_info, NOSSD) &&
3681 !fs_info->fs_devices->rotating) {
3682 btrfs_set_and_info(fs_info, SSD, "enabling ssd optimizations");
3686 * Mount does not set all options immediately, we can do it now and do
3687 * not have to wait for transaction commit
3689 btrfs_apply_pending_changes(fs_info);
3691 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
3692 if (btrfs_test_opt(fs_info, CHECK_INTEGRITY)) {
3693 ret = btrfsic_mount(fs_info, fs_devices,
3694 btrfs_test_opt(fs_info,
3695 CHECK_INTEGRITY_DATA) ? 1 : 0,
3696 fs_info->check_integrity_print_mask);
3699 "failed to initialize integrity check module: %d",
3703 ret = btrfs_read_qgroup_config(fs_info);
3705 goto fail_trans_kthread;
3707 if (btrfs_build_ref_tree(fs_info))
3708 btrfs_err(fs_info, "couldn't build ref tree");
3710 /* do not make disk changes in broken FS or nologreplay is given */
3711 if (btrfs_super_log_root(disk_super) != 0 &&
3712 !btrfs_test_opt(fs_info, NOLOGREPLAY)) {
3713 btrfs_info(fs_info, "start tree-log replay");
3714 ret = btrfs_replay_log(fs_info, fs_devices);
3721 fs_info->fs_root = btrfs_get_fs_root(fs_info, BTRFS_FS_TREE_OBJECTID, true);
3722 if (IS_ERR(fs_info->fs_root)) {
3723 err = PTR_ERR(fs_info->fs_root);
3724 btrfs_warn(fs_info, "failed to read fs tree: %d", err);
3725 fs_info->fs_root = NULL;
3732 ret = btrfs_start_pre_rw_mount(fs_info);
3734 close_ctree(fs_info);
3737 btrfs_discard_resume(fs_info);
3739 if (fs_info->uuid_root &&
3740 (btrfs_test_opt(fs_info, RESCAN_UUID_TREE) ||
3741 fs_info->generation != btrfs_super_uuid_tree_generation(disk_super))) {
3742 btrfs_info(fs_info, "checking UUID tree");
3743 ret = btrfs_check_uuid_tree(fs_info);
3746 "failed to check the UUID tree: %d", ret);
3747 close_ctree(fs_info);
3752 set_bit(BTRFS_FS_OPEN, &fs_info->flags);
3754 /* Kick the cleaner thread so it'll start deleting snapshots. */
3755 if (test_bit(BTRFS_FS_UNFINISHED_DROPS, &fs_info->flags))
3756 wake_up_process(fs_info->cleaner_kthread);
3759 btrfs_clear_oneshot_options(fs_info);
3763 btrfs_free_qgroup_config(fs_info);
3765 kthread_stop(fs_info->transaction_kthread);
3766 btrfs_cleanup_transaction(fs_info);
3767 btrfs_free_fs_roots(fs_info);
3769 kthread_stop(fs_info->cleaner_kthread);
3772 * make sure we're done with the btree inode before we stop our
3775 filemap_write_and_wait(fs_info->btree_inode->i_mapping);
3778 btrfs_sysfs_remove_mounted(fs_info);
3781 btrfs_sysfs_remove_fsid(fs_info->fs_devices);
3784 btrfs_put_block_group_cache(fs_info);
3787 if (fs_info->data_reloc_root)
3788 btrfs_drop_and_free_fs_root(fs_info, fs_info->data_reloc_root);
3789 free_root_pointers(fs_info, true);
3790 invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
3793 btrfs_stop_all_workers(fs_info);
3794 btrfs_free_block_groups(fs_info);
3796 btrfs_mapping_tree_free(&fs_info->mapping_tree);
3798 iput(fs_info->btree_inode);
3800 btrfs_close_devices(fs_info->fs_devices);
3803 ALLOW_ERROR_INJECTION(open_ctree, ERRNO);
3805 static void btrfs_end_super_write(struct bio *bio)
3807 struct btrfs_device *device = bio->bi_private;
3808 struct bio_vec *bvec;
3809 struct bvec_iter_all iter_all;
3812 bio_for_each_segment_all(bvec, bio, iter_all) {
3813 page = bvec->bv_page;
3815 if (bio->bi_status) {
3816 btrfs_warn_rl_in_rcu(device->fs_info,
3817 "lost page write due to IO error on %s (%d)",
3818 rcu_str_deref(device->name),
3819 blk_status_to_errno(bio->bi_status));
3820 ClearPageUptodate(page);
3822 btrfs_dev_stat_inc_and_print(device,
3823 BTRFS_DEV_STAT_WRITE_ERRS);
3825 SetPageUptodate(page);
3835 struct btrfs_super_block *btrfs_read_dev_one_super(struct block_device *bdev,
3838 struct btrfs_super_block *super;
3840 u64 bytenr, bytenr_orig;
3841 struct address_space *mapping = bdev->bd_inode->i_mapping;
3844 bytenr_orig = btrfs_sb_offset(copy_num);
3845 ret = btrfs_sb_log_location_bdev(bdev, copy_num, READ, &bytenr);
3847 return ERR_PTR(-EINVAL);
3849 return ERR_PTR(ret);
3851 if (bytenr + BTRFS_SUPER_INFO_SIZE >= bdev_nr_bytes(bdev))
3852 return ERR_PTR(-EINVAL);
3854 page = read_cache_page_gfp(mapping, bytenr >> PAGE_SHIFT, GFP_NOFS);
3856 return ERR_CAST(page);
3858 super = page_address(page);
3859 if (btrfs_super_magic(super) != BTRFS_MAGIC) {
3860 btrfs_release_disk_super(super);
3861 return ERR_PTR(-ENODATA);
3864 if (btrfs_super_bytenr(super) != bytenr_orig) {
3865 btrfs_release_disk_super(super);
3866 return ERR_PTR(-EINVAL);
3873 struct btrfs_super_block *btrfs_read_dev_super(struct block_device *bdev)
3875 struct btrfs_super_block *super, *latest = NULL;
3879 /* we would like to check all the supers, but that would make
3880 * a btrfs mount succeed after a mkfs from a different FS.
3881 * So, we need to add a special mount option to scan for
3882 * later supers, using BTRFS_SUPER_MIRROR_MAX instead
3884 for (i = 0; i < 1; i++) {
3885 super = btrfs_read_dev_one_super(bdev, i);
3889 if (!latest || btrfs_super_generation(super) > transid) {
3891 btrfs_release_disk_super(super);
3894 transid = btrfs_super_generation(super);
3902 * Write superblock @sb to the @device. Do not wait for completion, all the
3903 * pages we use for writing are locked.
3905 * Write @max_mirrors copies of the superblock, where 0 means default that fit
3906 * the expected device size at commit time. Note that max_mirrors must be
3907 * same for write and wait phases.
3909 * Return number of errors when page is not found or submission fails.
3911 static int write_dev_supers(struct btrfs_device *device,
3912 struct btrfs_super_block *sb, int max_mirrors)
3914 struct btrfs_fs_info *fs_info = device->fs_info;
3915 struct address_space *mapping = device->bdev->bd_inode->i_mapping;
3916 SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
3920 u64 bytenr, bytenr_orig;
3922 if (max_mirrors == 0)
3923 max_mirrors = BTRFS_SUPER_MIRROR_MAX;
3925 shash->tfm = fs_info->csum_shash;
3927 for (i = 0; i < max_mirrors; i++) {
3930 struct btrfs_super_block *disk_super;
3932 bytenr_orig = btrfs_sb_offset(i);
3933 ret = btrfs_sb_log_location(device, i, WRITE, &bytenr);
3934 if (ret == -ENOENT) {
3936 } else if (ret < 0) {
3937 btrfs_err(device->fs_info,
3938 "couldn't get super block location for mirror %d",
3943 if (bytenr + BTRFS_SUPER_INFO_SIZE >=
3944 device->commit_total_bytes)
3947 btrfs_set_super_bytenr(sb, bytenr_orig);
3949 crypto_shash_digest(shash, (const char *)sb + BTRFS_CSUM_SIZE,
3950 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE,
3953 page = find_or_create_page(mapping, bytenr >> PAGE_SHIFT,
3956 btrfs_err(device->fs_info,
3957 "couldn't get super block page for bytenr %llu",
3963 /* Bump the refcount for wait_dev_supers() */
3966 disk_super = page_address(page);
3967 memcpy(disk_super, sb, BTRFS_SUPER_INFO_SIZE);
3970 * Directly use bios here instead of relying on the page cache
3971 * to do I/O, so we don't lose the ability to do integrity
3974 bio = bio_alloc(device->bdev, 1,
3975 REQ_OP_WRITE | REQ_SYNC | REQ_META | REQ_PRIO,
3977 bio->bi_iter.bi_sector = bytenr >> SECTOR_SHIFT;
3978 bio->bi_private = device;
3979 bio->bi_end_io = btrfs_end_super_write;
3980 __bio_add_page(bio, page, BTRFS_SUPER_INFO_SIZE,
3981 offset_in_page(bytenr));
3984 * We FUA only the first super block. The others we allow to
3985 * go down lazy and there's a short window where the on-disk
3986 * copies might still contain the older version.
3988 if (i == 0 && !btrfs_test_opt(device->fs_info, NOBARRIER))
3989 bio->bi_opf |= REQ_FUA;
3991 btrfsic_check_bio(bio);
3994 if (btrfs_advance_sb_log(device, i))
3997 return errors < i ? 0 : -1;
4001 * Wait for write completion of superblocks done by write_dev_supers,
4002 * @max_mirrors same for write and wait phases.
4004 * Return number of errors when page is not found or not marked up to
4007 static int wait_dev_supers(struct btrfs_device *device, int max_mirrors)
4011 bool primary_failed = false;
4015 if (max_mirrors == 0)
4016 max_mirrors = BTRFS_SUPER_MIRROR_MAX;
4018 for (i = 0; i < max_mirrors; i++) {
4021 ret = btrfs_sb_log_location(device, i, READ, &bytenr);
4022 if (ret == -ENOENT) {
4024 } else if (ret < 0) {
4027 primary_failed = true;
4030 if (bytenr + BTRFS_SUPER_INFO_SIZE >=
4031 device->commit_total_bytes)
4034 page = find_get_page(device->bdev->bd_inode->i_mapping,
4035 bytenr >> PAGE_SHIFT);
4039 primary_failed = true;
4042 /* Page is submitted locked and unlocked once the IO completes */
4043 wait_on_page_locked(page);
4044 if (PageError(page)) {
4047 primary_failed = true;
4050 /* Drop our reference */
4053 /* Drop the reference from the writing run */
4057 /* log error, force error return */
4058 if (primary_failed) {
4059 btrfs_err(device->fs_info, "error writing primary super block to device %llu",
4064 return errors < i ? 0 : -1;
4068 * endio for the write_dev_flush, this will wake anyone waiting
4069 * for the barrier when it is done
4071 static void btrfs_end_empty_barrier(struct bio *bio)
4074 complete(bio->bi_private);
4078 * Submit a flush request to the device if it supports it. Error handling is
4079 * done in the waiting counterpart.
4081 static void write_dev_flush(struct btrfs_device *device)
4083 struct bio *bio = &device->flush_bio;
4085 #ifndef CONFIG_BTRFS_FS_CHECK_INTEGRITY
4087 * When a disk has write caching disabled, we skip submission of a bio
4088 * with flush and sync requests before writing the superblock, since
4089 * it's not needed. However when the integrity checker is enabled, this
4090 * results in reports that there are metadata blocks referred by a
4091 * superblock that were not properly flushed. So don't skip the bio
4092 * submission only when the integrity checker is enabled for the sake
4093 * of simplicity, since this is a debug tool and not meant for use in
4096 if (!bdev_write_cache(device->bdev))
4100 bio_init(bio, device->bdev, NULL, 0,
4101 REQ_OP_WRITE | REQ_SYNC | REQ_PREFLUSH);
4102 bio->bi_end_io = btrfs_end_empty_barrier;
4103 init_completion(&device->flush_wait);
4104 bio->bi_private = &device->flush_wait;
4106 btrfsic_check_bio(bio);
4108 set_bit(BTRFS_DEV_STATE_FLUSH_SENT, &device->dev_state);
4112 * If the flush bio has been submitted by write_dev_flush, wait for it.
4114 static blk_status_t wait_dev_flush(struct btrfs_device *device)
4116 struct bio *bio = &device->flush_bio;
4118 if (!test_bit(BTRFS_DEV_STATE_FLUSH_SENT, &device->dev_state))
4121 clear_bit(BTRFS_DEV_STATE_FLUSH_SENT, &device->dev_state);
4122 wait_for_completion_io(&device->flush_wait);
4124 return bio->bi_status;
4127 static int check_barrier_error(struct btrfs_fs_info *fs_info)
4129 if (!btrfs_check_rw_degradable(fs_info, NULL))
4135 * send an empty flush down to each device in parallel,
4136 * then wait for them
4138 static int barrier_all_devices(struct btrfs_fs_info *info)
4140 struct list_head *head;
4141 struct btrfs_device *dev;
4142 int errors_wait = 0;
4145 lockdep_assert_held(&info->fs_devices->device_list_mutex);
4146 /* send down all the barriers */
4147 head = &info->fs_devices->devices;
4148 list_for_each_entry(dev, head, dev_list) {
4149 if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state))
4153 if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
4154 !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
4157 write_dev_flush(dev);
4158 dev->last_flush_error = BLK_STS_OK;
4161 /* wait for all the barriers */
4162 list_for_each_entry(dev, head, dev_list) {
4163 if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state))
4169 if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
4170 !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
4173 ret = wait_dev_flush(dev);
4175 dev->last_flush_error = ret;
4176 btrfs_dev_stat_inc_and_print(dev,
4177 BTRFS_DEV_STAT_FLUSH_ERRS);
4184 * At some point we need the status of all disks
4185 * to arrive at the volume status. So error checking
4186 * is being pushed to a separate loop.
4188 return check_barrier_error(info);
4193 int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags)
4196 int min_tolerated = INT_MAX;
4198 if ((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0 ||
4199 (flags & BTRFS_AVAIL_ALLOC_BIT_SINGLE))
4200 min_tolerated = min_t(int, min_tolerated,
4201 btrfs_raid_array[BTRFS_RAID_SINGLE].
4202 tolerated_failures);
4204 for (raid_type = 0; raid_type < BTRFS_NR_RAID_TYPES; raid_type++) {
4205 if (raid_type == BTRFS_RAID_SINGLE)
4207 if (!(flags & btrfs_raid_array[raid_type].bg_flag))
4209 min_tolerated = min_t(int, min_tolerated,
4210 btrfs_raid_array[raid_type].
4211 tolerated_failures);
4214 if (min_tolerated == INT_MAX) {
4215 pr_warn("BTRFS: unknown raid flag: %llu", flags);
4219 return min_tolerated;
4222 int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors)
4224 struct list_head *head;
4225 struct btrfs_device *dev;
4226 struct btrfs_super_block *sb;
4227 struct btrfs_dev_item *dev_item;
4231 int total_errors = 0;
4234 do_barriers = !btrfs_test_opt(fs_info, NOBARRIER);
4237 * max_mirrors == 0 indicates we're from commit_transaction,
4238 * not from fsync where the tree roots in fs_info have not
4239 * been consistent on disk.
4241 if (max_mirrors == 0)
4242 backup_super_roots(fs_info);
4244 sb = fs_info->super_for_commit;
4245 dev_item = &sb->dev_item;
4247 mutex_lock(&fs_info->fs_devices->device_list_mutex);
4248 head = &fs_info->fs_devices->devices;
4249 max_errors = btrfs_super_num_devices(fs_info->super_copy) - 1;
4252 ret = barrier_all_devices(fs_info);
4255 &fs_info->fs_devices->device_list_mutex);
4256 btrfs_handle_fs_error(fs_info, ret,
4257 "errors while submitting device barriers.");
4262 list_for_each_entry(dev, head, dev_list) {
4267 if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
4268 !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
4271 btrfs_set_stack_device_generation(dev_item, 0);
4272 btrfs_set_stack_device_type(dev_item, dev->type);
4273 btrfs_set_stack_device_id(dev_item, dev->devid);
4274 btrfs_set_stack_device_total_bytes(dev_item,
4275 dev->commit_total_bytes);
4276 btrfs_set_stack_device_bytes_used(dev_item,
4277 dev->commit_bytes_used);
4278 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
4279 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
4280 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
4281 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
4282 memcpy(dev_item->fsid, dev->fs_devices->metadata_uuid,
4285 flags = btrfs_super_flags(sb);
4286 btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
4288 ret = btrfs_validate_write_super(fs_info, sb);
4290 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
4291 btrfs_handle_fs_error(fs_info, -EUCLEAN,
4292 "unexpected superblock corruption detected");
4296 ret = write_dev_supers(dev, sb, max_mirrors);
4300 if (total_errors > max_errors) {
4301 btrfs_err(fs_info, "%d errors while writing supers",
4303 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
4305 /* FUA is masked off if unsupported and can't be the reason */
4306 btrfs_handle_fs_error(fs_info, -EIO,
4307 "%d errors while writing supers",
4313 list_for_each_entry(dev, head, dev_list) {
4316 if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
4317 !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state))
4320 ret = wait_dev_supers(dev, max_mirrors);
4324 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
4325 if (total_errors > max_errors) {
4326 btrfs_handle_fs_error(fs_info, -EIO,
4327 "%d errors while writing supers",
4334 /* Drop a fs root from the radix tree and free it. */
4335 void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
4336 struct btrfs_root *root)
4338 bool drop_ref = false;
4340 spin_lock(&fs_info->fs_roots_radix_lock);
4341 radix_tree_delete(&fs_info->fs_roots_radix,
4342 (unsigned long)root->root_key.objectid);
4343 if (test_and_clear_bit(BTRFS_ROOT_IN_RADIX, &root->state))
4345 spin_unlock(&fs_info->fs_roots_radix_lock);
4347 if (BTRFS_FS_ERROR(fs_info)) {
4348 ASSERT(root->log_root == NULL);
4349 if (root->reloc_root) {
4350 btrfs_put_root(root->reloc_root);
4351 root->reloc_root = NULL;
4356 btrfs_put_root(root);
4359 int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info)
4361 u64 root_objectid = 0;
4362 struct btrfs_root *gang[8];
4365 unsigned int ret = 0;
4368 spin_lock(&fs_info->fs_roots_radix_lock);
4369 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
4370 (void **)gang, root_objectid,
4373 spin_unlock(&fs_info->fs_roots_radix_lock);
4376 root_objectid = gang[ret - 1]->root_key.objectid + 1;
4378 for (i = 0; i < ret; i++) {
4379 /* Avoid to grab roots in dead_roots */
4380 if (btrfs_root_refs(&gang[i]->root_item) == 0) {
4384 /* grab all the search result for later use */
4385 gang[i] = btrfs_grab_root(gang[i]);
4387 spin_unlock(&fs_info->fs_roots_radix_lock);
4389 for (i = 0; i < ret; i++) {
4392 root_objectid = gang[i]->root_key.objectid;
4393 err = btrfs_orphan_cleanup(gang[i]);
4396 btrfs_put_root(gang[i]);
4401 /* release the uncleaned roots due to error */
4402 for (; i < ret; i++) {
4404 btrfs_put_root(gang[i]);
4409 int btrfs_commit_super(struct btrfs_fs_info *fs_info)
4411 struct btrfs_root *root = fs_info->tree_root;
4412 struct btrfs_trans_handle *trans;
4414 mutex_lock(&fs_info->cleaner_mutex);
4415 btrfs_run_delayed_iputs(fs_info);
4416 mutex_unlock(&fs_info->cleaner_mutex);
4417 wake_up_process(fs_info->cleaner_kthread);
4419 /* wait until ongoing cleanup work done */
4420 down_write(&fs_info->cleanup_work_sem);
4421 up_write(&fs_info->cleanup_work_sem);
4423 trans = btrfs_join_transaction(root);
4425 return PTR_ERR(trans);
4426 return btrfs_commit_transaction(trans);
4429 static void warn_about_uncommitted_trans(struct btrfs_fs_info *fs_info)
4431 struct btrfs_transaction *trans;
4432 struct btrfs_transaction *tmp;
4435 if (list_empty(&fs_info->trans_list))
4439 * This function is only called at the very end of close_ctree(),
4440 * thus no other running transaction, no need to take trans_lock.
4442 ASSERT(test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags));
4443 list_for_each_entry_safe(trans, tmp, &fs_info->trans_list, list) {
4444 struct extent_state *cached = NULL;
4445 u64 dirty_bytes = 0;
4451 while (!find_first_extent_bit(&trans->dirty_pages, cur,
4452 &found_start, &found_end, EXTENT_DIRTY, &cached)) {
4453 dirty_bytes += found_end + 1 - found_start;
4454 cur = found_end + 1;
4457 "transaction %llu (with %llu dirty metadata bytes) is not committed",
4458 trans->transid, dirty_bytes);
4459 btrfs_cleanup_one_transaction(trans, fs_info);
4461 if (trans == fs_info->running_transaction)
4462 fs_info->running_transaction = NULL;
4463 list_del_init(&trans->list);
4465 btrfs_put_transaction(trans);
4466 trace_btrfs_transaction_commit(fs_info);
4471 void __cold close_ctree(struct btrfs_fs_info *fs_info)
4475 set_bit(BTRFS_FS_CLOSING_START, &fs_info->flags);
4478 * If we had UNFINISHED_DROPS we could still be processing them, so
4479 * clear that bit and wake up relocation so it can stop.
4480 * We must do this before stopping the block group reclaim task, because
4481 * at btrfs_relocate_block_group() we wait for this bit, and after the
4482 * wait we stop with -EINTR if btrfs_fs_closing() returns non-zero - we
4483 * have just set BTRFS_FS_CLOSING_START, so btrfs_fs_closing() will
4486 btrfs_wake_unfinished_drop(fs_info);
4489 * We may have the reclaim task running and relocating a data block group,
4490 * in which case it may create delayed iputs. So stop it before we park
4491 * the cleaner kthread otherwise we can get new delayed iputs after
4492 * parking the cleaner, and that can make the async reclaim task to hang
4493 * if it's waiting for delayed iputs to complete, since the cleaner is
4494 * parked and can not run delayed iputs - this will make us hang when
4495 * trying to stop the async reclaim task.
4497 cancel_work_sync(&fs_info->reclaim_bgs_work);
4499 * We don't want the cleaner to start new transactions, add more delayed
4500 * iputs, etc. while we're closing. We can't use kthread_stop() yet
4501 * because that frees the task_struct, and the transaction kthread might
4502 * still try to wake up the cleaner.
4504 kthread_park(fs_info->cleaner_kthread);
4506 /* wait for the qgroup rescan worker to stop */
4507 btrfs_qgroup_wait_for_completion(fs_info, false);
4509 /* wait for the uuid_scan task to finish */
4510 down(&fs_info->uuid_tree_rescan_sem);
4511 /* avoid complains from lockdep et al., set sem back to initial state */
4512 up(&fs_info->uuid_tree_rescan_sem);
4514 /* pause restriper - we want to resume on mount */
4515 btrfs_pause_balance(fs_info);
4517 btrfs_dev_replace_suspend_for_unmount(fs_info);
4519 btrfs_scrub_cancel(fs_info);
4521 /* wait for any defraggers to finish */
4522 wait_event(fs_info->transaction_wait,
4523 (atomic_read(&fs_info->defrag_running) == 0));
4525 /* clear out the rbtree of defraggable inodes */
4526 btrfs_cleanup_defrag_inodes(fs_info);
4529 * After we parked the cleaner kthread, ordered extents may have
4530 * completed and created new delayed iputs. If one of the async reclaim
4531 * tasks is running and in the RUN_DELAYED_IPUTS flush state, then we
4532 * can hang forever trying to stop it, because if a delayed iput is
4533 * added after it ran btrfs_run_delayed_iputs() and before it called
4534 * btrfs_wait_on_delayed_iputs(), it will hang forever since there is
4535 * no one else to run iputs.
4537 * So wait for all ongoing ordered extents to complete and then run
4538 * delayed iputs. This works because once we reach this point no one
4539 * can either create new ordered extents nor create delayed iputs
4540 * through some other means.
4542 * Also note that btrfs_wait_ordered_roots() is not safe here, because
4543 * it waits for BTRFS_ORDERED_COMPLETE to be set on an ordered extent,
4544 * but the delayed iput for the respective inode is made only when doing
4545 * the final btrfs_put_ordered_extent() (which must happen at
4546 * btrfs_finish_ordered_io() when we are unmounting).
4548 btrfs_flush_workqueue(fs_info->endio_write_workers);
4549 /* Ordered extents for free space inodes. */
4550 btrfs_flush_workqueue(fs_info->endio_freespace_worker);
4551 btrfs_run_delayed_iputs(fs_info);
4553 cancel_work_sync(&fs_info->async_reclaim_work);
4554 cancel_work_sync(&fs_info->async_data_reclaim_work);
4555 cancel_work_sync(&fs_info->preempt_reclaim_work);
4557 /* Cancel or finish ongoing discard work */
4558 btrfs_discard_cleanup(fs_info);
4560 if (!sb_rdonly(fs_info->sb)) {
4562 * The cleaner kthread is stopped, so do one final pass over
4563 * unused block groups.
4565 btrfs_delete_unused_bgs(fs_info);
4568 * There might be existing delayed inode workers still running
4569 * and holding an empty delayed inode item. We must wait for
4570 * them to complete first because they can create a transaction.
4571 * This happens when someone calls btrfs_balance_delayed_items()
4572 * and then a transaction commit runs the same delayed nodes
4573 * before any delayed worker has done something with the nodes.
4574 * We must wait for any worker here and not at transaction
4575 * commit time since that could cause a deadlock.
4576 * This is a very rare case.
4578 btrfs_flush_workqueue(fs_info->delayed_workers);
4580 ret = btrfs_commit_super(fs_info);
4582 btrfs_err(fs_info, "commit super ret %d", ret);
4585 if (BTRFS_FS_ERROR(fs_info))
4586 btrfs_error_commit_super(fs_info);
4588 kthread_stop(fs_info->transaction_kthread);
4589 kthread_stop(fs_info->cleaner_kthread);
4591 ASSERT(list_empty(&fs_info->delayed_iputs));
4592 set_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags);
4594 if (btrfs_check_quota_leak(fs_info)) {
4595 WARN_ON(IS_ENABLED(CONFIG_BTRFS_DEBUG));
4596 btrfs_err(fs_info, "qgroup reserved space leaked");
4599 btrfs_free_qgroup_config(fs_info);
4600 ASSERT(list_empty(&fs_info->delalloc_roots));
4602 if (percpu_counter_sum(&fs_info->delalloc_bytes)) {
4603 btrfs_info(fs_info, "at unmount delalloc count %lld",
4604 percpu_counter_sum(&fs_info->delalloc_bytes));
4607 if (percpu_counter_sum(&fs_info->ordered_bytes))
4608 btrfs_info(fs_info, "at unmount dio bytes count %lld",
4609 percpu_counter_sum(&fs_info->ordered_bytes));
4611 btrfs_sysfs_remove_mounted(fs_info);
4612 btrfs_sysfs_remove_fsid(fs_info->fs_devices);
4614 btrfs_put_block_group_cache(fs_info);
4617 * we must make sure there is not any read request to
4618 * submit after we stopping all workers.
4620 invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
4621 btrfs_stop_all_workers(fs_info);
4623 /* We shouldn't have any transaction open at this point */
4624 warn_about_uncommitted_trans(fs_info);
4626 clear_bit(BTRFS_FS_OPEN, &fs_info->flags);
4627 free_root_pointers(fs_info, true);
4628 btrfs_free_fs_roots(fs_info);
4631 * We must free the block groups after dropping the fs_roots as we could
4632 * have had an IO error and have left over tree log blocks that aren't
4633 * cleaned up until the fs roots are freed. This makes the block group
4634 * accounting appear to be wrong because there's pending reserved bytes,
4635 * so make sure we do the block group cleanup afterwards.
4637 btrfs_free_block_groups(fs_info);
4639 iput(fs_info->btree_inode);
4641 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
4642 if (btrfs_test_opt(fs_info, CHECK_INTEGRITY))
4643 btrfsic_unmount(fs_info->fs_devices);
4646 btrfs_mapping_tree_free(&fs_info->mapping_tree);
4647 btrfs_close_devices(fs_info->fs_devices);
4650 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
4654 struct inode *btree_inode = buf->pages[0]->mapping->host;
4656 ret = extent_buffer_uptodate(buf);
4660 ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf,
4661 parent_transid, atomic);
4667 void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
4669 struct btrfs_fs_info *fs_info = buf->fs_info;
4670 u64 transid = btrfs_header_generation(buf);
4673 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
4675 * This is a fast path so only do this check if we have sanity tests
4676 * enabled. Normal people shouldn't be using unmapped buffers as dirty
4677 * outside of the sanity tests.
4679 if (unlikely(test_bit(EXTENT_BUFFER_UNMAPPED, &buf->bflags)))
4682 btrfs_assert_tree_write_locked(buf);
4683 if (transid != fs_info->generation)
4684 WARN(1, KERN_CRIT "btrfs transid mismatch buffer %llu, found %llu running %llu\n",
4685 buf->start, transid, fs_info->generation);
4686 was_dirty = set_extent_buffer_dirty(buf);
4688 percpu_counter_add_batch(&fs_info->dirty_metadata_bytes,
4690 fs_info->dirty_metadata_batch);
4691 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
4693 * Since btrfs_mark_buffer_dirty() can be called with item pointer set
4694 * but item data not updated.
4695 * So here we should only check item pointers, not item data.
4697 if (btrfs_header_level(buf) == 0 &&
4698 btrfs_check_leaf_relaxed(buf)) {
4699 btrfs_print_leaf(buf);
4705 static void __btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info,
4709 * looks as though older kernels can get into trouble with
4710 * this code, they end up stuck in balance_dirty_pages forever
4714 if (current->flags & PF_MEMALLOC)
4718 btrfs_balance_delayed_items(fs_info);
4720 ret = __percpu_counter_compare(&fs_info->dirty_metadata_bytes,
4721 BTRFS_DIRTY_METADATA_THRESH,
4722 fs_info->dirty_metadata_batch);
4724 balance_dirty_pages_ratelimited(fs_info->btree_inode->i_mapping);
4728 void btrfs_btree_balance_dirty(struct btrfs_fs_info *fs_info)
4730 __btrfs_btree_balance_dirty(fs_info, 1);
4733 void btrfs_btree_balance_dirty_nodelay(struct btrfs_fs_info *fs_info)
4735 __btrfs_btree_balance_dirty(fs_info, 0);
4738 static void btrfs_error_commit_super(struct btrfs_fs_info *fs_info)
4740 /* cleanup FS via transaction */
4741 btrfs_cleanup_transaction(fs_info);
4743 mutex_lock(&fs_info->cleaner_mutex);
4744 btrfs_run_delayed_iputs(fs_info);
4745 mutex_unlock(&fs_info->cleaner_mutex);
4747 down_write(&fs_info->cleanup_work_sem);
4748 up_write(&fs_info->cleanup_work_sem);
4751 static void btrfs_drop_all_logs(struct btrfs_fs_info *fs_info)
4753 struct btrfs_root *gang[8];
4754 u64 root_objectid = 0;
4757 spin_lock(&fs_info->fs_roots_radix_lock);
4758 while ((ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
4759 (void **)gang, root_objectid,
4760 ARRAY_SIZE(gang))) != 0) {
4763 for (i = 0; i < ret; i++)
4764 gang[i] = btrfs_grab_root(gang[i]);
4765 spin_unlock(&fs_info->fs_roots_radix_lock);
4767 for (i = 0; i < ret; i++) {
4770 root_objectid = gang[i]->root_key.objectid;
4771 btrfs_free_log(NULL, gang[i]);
4772 btrfs_put_root(gang[i]);
4775 spin_lock(&fs_info->fs_roots_radix_lock);
4777 spin_unlock(&fs_info->fs_roots_radix_lock);
4778 btrfs_free_log_root_tree(NULL, fs_info);
4781 static void btrfs_destroy_ordered_extents(struct btrfs_root *root)
4783 struct btrfs_ordered_extent *ordered;
4785 spin_lock(&root->ordered_extent_lock);
4787 * This will just short circuit the ordered completion stuff which will
4788 * make sure the ordered extent gets properly cleaned up.
4790 list_for_each_entry(ordered, &root->ordered_extents,
4792 set_bit(BTRFS_ORDERED_IOERR, &ordered->flags);
4793 spin_unlock(&root->ordered_extent_lock);
4796 static void btrfs_destroy_all_ordered_extents(struct btrfs_fs_info *fs_info)
4798 struct btrfs_root *root;
4799 struct list_head splice;
4801 INIT_LIST_HEAD(&splice);
4803 spin_lock(&fs_info->ordered_root_lock);
4804 list_splice_init(&fs_info->ordered_roots, &splice);
4805 while (!list_empty(&splice)) {
4806 root = list_first_entry(&splice, struct btrfs_root,
4808 list_move_tail(&root->ordered_root,
4809 &fs_info->ordered_roots);
4811 spin_unlock(&fs_info->ordered_root_lock);
4812 btrfs_destroy_ordered_extents(root);
4815 spin_lock(&fs_info->ordered_root_lock);
4817 spin_unlock(&fs_info->ordered_root_lock);
4820 * We need this here because if we've been flipped read-only we won't
4821 * get sync() from the umount, so we need to make sure any ordered
4822 * extents that haven't had their dirty pages IO start writeout yet
4823 * actually get run and error out properly.
4825 btrfs_wait_ordered_roots(fs_info, U64_MAX, 0, (u64)-1);
4828 static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
4829 struct btrfs_fs_info *fs_info)
4831 struct rb_node *node;
4832 struct btrfs_delayed_ref_root *delayed_refs;
4833 struct btrfs_delayed_ref_node *ref;
4836 delayed_refs = &trans->delayed_refs;
4838 spin_lock(&delayed_refs->lock);
4839 if (atomic_read(&delayed_refs->num_entries) == 0) {
4840 spin_unlock(&delayed_refs->lock);
4841 btrfs_debug(fs_info, "delayed_refs has NO entry");
4845 while ((node = rb_first_cached(&delayed_refs->href_root)) != NULL) {
4846 struct btrfs_delayed_ref_head *head;
4848 bool pin_bytes = false;
4850 head = rb_entry(node, struct btrfs_delayed_ref_head,
4852 if (btrfs_delayed_ref_lock(delayed_refs, head))
4855 spin_lock(&head->lock);
4856 while ((n = rb_first_cached(&head->ref_tree)) != NULL) {
4857 ref = rb_entry(n, struct btrfs_delayed_ref_node,
4860 rb_erase_cached(&ref->ref_node, &head->ref_tree);
4861 RB_CLEAR_NODE(&ref->ref_node);
4862 if (!list_empty(&ref->add_list))
4863 list_del(&ref->add_list);
4864 atomic_dec(&delayed_refs->num_entries);
4865 btrfs_put_delayed_ref(ref);
4867 if (head->must_insert_reserved)
4869 btrfs_free_delayed_extent_op(head->extent_op);
4870 btrfs_delete_ref_head(delayed_refs, head);
4871 spin_unlock(&head->lock);
4872 spin_unlock(&delayed_refs->lock);
4873 mutex_unlock(&head->mutex);
4876 struct btrfs_block_group *cache;
4878 cache = btrfs_lookup_block_group(fs_info, head->bytenr);
4881 spin_lock(&cache->space_info->lock);
4882 spin_lock(&cache->lock);
4883 cache->pinned += head->num_bytes;
4884 btrfs_space_info_update_bytes_pinned(fs_info,
4885 cache->space_info, head->num_bytes);
4886 cache->reserved -= head->num_bytes;
4887 cache->space_info->bytes_reserved -= head->num_bytes;
4888 spin_unlock(&cache->lock);
4889 spin_unlock(&cache->space_info->lock);
4891 btrfs_put_block_group(cache);
4893 btrfs_error_unpin_extent_range(fs_info, head->bytenr,
4894 head->bytenr + head->num_bytes - 1);
4896 btrfs_cleanup_ref_head_accounting(fs_info, delayed_refs, head);
4897 btrfs_put_delayed_ref_head(head);
4899 spin_lock(&delayed_refs->lock);
4901 btrfs_qgroup_destroy_extent_records(trans);
4903 spin_unlock(&delayed_refs->lock);
4908 static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root)
4910 struct btrfs_inode *btrfs_inode;
4911 struct list_head splice;
4913 INIT_LIST_HEAD(&splice);
4915 spin_lock(&root->delalloc_lock);
4916 list_splice_init(&root->delalloc_inodes, &splice);
4918 while (!list_empty(&splice)) {
4919 struct inode *inode = NULL;
4920 btrfs_inode = list_first_entry(&splice, struct btrfs_inode,
4922 __btrfs_del_delalloc_inode(root, btrfs_inode);
4923 spin_unlock(&root->delalloc_lock);
4926 * Make sure we get a live inode and that it'll not disappear
4929 inode = igrab(&btrfs_inode->vfs_inode);
4931 invalidate_inode_pages2(inode->i_mapping);
4934 spin_lock(&root->delalloc_lock);
4936 spin_unlock(&root->delalloc_lock);
4939 static void btrfs_destroy_all_delalloc_inodes(struct btrfs_fs_info *fs_info)
4941 struct btrfs_root *root;
4942 struct list_head splice;
4944 INIT_LIST_HEAD(&splice);
4946 spin_lock(&fs_info->delalloc_root_lock);
4947 list_splice_init(&fs_info->delalloc_roots, &splice);
4948 while (!list_empty(&splice)) {
4949 root = list_first_entry(&splice, struct btrfs_root,
4951 root = btrfs_grab_root(root);
4953 spin_unlock(&fs_info->delalloc_root_lock);
4955 btrfs_destroy_delalloc_inodes(root);
4956 btrfs_put_root(root);
4958 spin_lock(&fs_info->delalloc_root_lock);
4960 spin_unlock(&fs_info->delalloc_root_lock);
4963 static int btrfs_destroy_marked_extents(struct btrfs_fs_info *fs_info,
4964 struct extent_io_tree *dirty_pages,
4968 struct extent_buffer *eb;
4973 ret = find_first_extent_bit(dirty_pages, start, &start, &end,
4978 clear_extent_bits(dirty_pages, start, end, mark);
4979 while (start <= end) {
4980 eb = find_extent_buffer(fs_info, start);
4981 start += fs_info->nodesize;
4984 wait_on_extent_buffer_writeback(eb);
4986 if (test_and_clear_bit(EXTENT_BUFFER_DIRTY,
4988 clear_extent_buffer_dirty(eb);
4989 free_extent_buffer_stale(eb);
4996 static int btrfs_destroy_pinned_extent(struct btrfs_fs_info *fs_info,
4997 struct extent_io_tree *unpin)
5004 struct extent_state *cached_state = NULL;
5007 * The btrfs_finish_extent_commit() may get the same range as
5008 * ours between find_first_extent_bit and clear_extent_dirty.
5009 * Hence, hold the unused_bg_unpin_mutex to avoid double unpin
5010 * the same extent range.
5012 mutex_lock(&fs_info->unused_bg_unpin_mutex);
5013 ret = find_first_extent_bit(unpin, 0, &start, &end,
5014 EXTENT_DIRTY, &cached_state);
5016 mutex_unlock(&fs_info->unused_bg_unpin_mutex);
5020 clear_extent_dirty(unpin, start, end, &cached_state);
5021 free_extent_state(cached_state);
5022 btrfs_error_unpin_extent_range(fs_info, start, end);
5023 mutex_unlock(&fs_info->unused_bg_unpin_mutex);
5030 static void btrfs_cleanup_bg_io(struct btrfs_block_group *cache)
5032 struct inode *inode;
5034 inode = cache->io_ctl.inode;
5036 invalidate_inode_pages2(inode->i_mapping);
5037 BTRFS_I(inode)->generation = 0;
5038 cache->io_ctl.inode = NULL;
5041 ASSERT(cache->io_ctl.pages == NULL);
5042 btrfs_put_block_group(cache);
5045 void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *cur_trans,
5046 struct btrfs_fs_info *fs_info)
5048 struct btrfs_block_group *cache;
5050 spin_lock(&cur_trans->dirty_bgs_lock);
5051 while (!list_empty(&cur_trans->dirty_bgs)) {
5052 cache = list_first_entry(&cur_trans->dirty_bgs,
5053 struct btrfs_block_group,
5056 if (!list_empty(&cache->io_list)) {
5057 spin_unlock(&cur_trans->dirty_bgs_lock);
5058 list_del_init(&cache->io_list);
5059 btrfs_cleanup_bg_io(cache);
5060 spin_lock(&cur_trans->dirty_bgs_lock);
5063 list_del_init(&cache->dirty_list);
5064 spin_lock(&cache->lock);
5065 cache->disk_cache_state = BTRFS_DC_ERROR;
5066 spin_unlock(&cache->lock);
5068 spin_unlock(&cur_trans->dirty_bgs_lock);
5069 btrfs_put_block_group(cache);
5070 btrfs_delayed_refs_rsv_release(fs_info, 1);
5071 spin_lock(&cur_trans->dirty_bgs_lock);
5073 spin_unlock(&cur_trans->dirty_bgs_lock);
5076 * Refer to the definition of io_bgs member for details why it's safe
5077 * to use it without any locking
5079 while (!list_empty(&cur_trans->io_bgs)) {
5080 cache = list_first_entry(&cur_trans->io_bgs,
5081 struct btrfs_block_group,
5084 list_del_init(&cache->io_list);
5085 spin_lock(&cache->lock);
5086 cache->disk_cache_state = BTRFS_DC_ERROR;
5087 spin_unlock(&cache->lock);
5088 btrfs_cleanup_bg_io(cache);
5092 void btrfs_cleanup_one_transaction(struct btrfs_transaction *cur_trans,
5093 struct btrfs_fs_info *fs_info)
5095 struct btrfs_device *dev, *tmp;
5097 btrfs_cleanup_dirty_bgs(cur_trans, fs_info);
5098 ASSERT(list_empty(&cur_trans->dirty_bgs));
5099 ASSERT(list_empty(&cur_trans->io_bgs));
5101 list_for_each_entry_safe(dev, tmp, &cur_trans->dev_update_list,
5103 list_del_init(&dev->post_commit_list);
5106 btrfs_destroy_delayed_refs(cur_trans, fs_info);
5108 cur_trans->state = TRANS_STATE_COMMIT_START;
5109 wake_up(&fs_info->transaction_blocked_wait);
5111 cur_trans->state = TRANS_STATE_UNBLOCKED;
5112 wake_up(&fs_info->transaction_wait);
5114 btrfs_destroy_delayed_inodes(fs_info);
5116 btrfs_destroy_marked_extents(fs_info, &cur_trans->dirty_pages,
5118 btrfs_destroy_pinned_extent(fs_info, &cur_trans->pinned_extents);
5120 btrfs_free_redirty_list(cur_trans);
5122 cur_trans->state =TRANS_STATE_COMPLETED;
5123 wake_up(&cur_trans->commit_wait);
5126 static int btrfs_cleanup_transaction(struct btrfs_fs_info *fs_info)
5128 struct btrfs_transaction *t;
5130 mutex_lock(&fs_info->transaction_kthread_mutex);
5132 spin_lock(&fs_info->trans_lock);
5133 while (!list_empty(&fs_info->trans_list)) {
5134 t = list_first_entry(&fs_info->trans_list,
5135 struct btrfs_transaction, list);
5136 if (t->state >= TRANS_STATE_COMMIT_START) {
5137 refcount_inc(&t->use_count);
5138 spin_unlock(&fs_info->trans_lock);
5139 btrfs_wait_for_commit(fs_info, t->transid);
5140 btrfs_put_transaction(t);
5141 spin_lock(&fs_info->trans_lock);
5144 if (t == fs_info->running_transaction) {
5145 t->state = TRANS_STATE_COMMIT_DOING;
5146 spin_unlock(&fs_info->trans_lock);
5148 * We wait for 0 num_writers since we don't hold a trans
5149 * handle open currently for this transaction.
5151 wait_event(t->writer_wait,
5152 atomic_read(&t->num_writers) == 0);
5154 spin_unlock(&fs_info->trans_lock);
5156 btrfs_cleanup_one_transaction(t, fs_info);
5158 spin_lock(&fs_info->trans_lock);
5159 if (t == fs_info->running_transaction)
5160 fs_info->running_transaction = NULL;
5161 list_del_init(&t->list);
5162 spin_unlock(&fs_info->trans_lock);
5164 btrfs_put_transaction(t);
5165 trace_btrfs_transaction_commit(fs_info);
5166 spin_lock(&fs_info->trans_lock);
5168 spin_unlock(&fs_info->trans_lock);
5169 btrfs_destroy_all_ordered_extents(fs_info);
5170 btrfs_destroy_delayed_inodes(fs_info);
5171 btrfs_assert_delayed_root_empty(fs_info);
5172 btrfs_destroy_all_delalloc_inodes(fs_info);
5173 btrfs_drop_all_logs(fs_info);
5174 mutex_unlock(&fs_info->transaction_kthread_mutex);
5179 int btrfs_init_root_free_objectid(struct btrfs_root *root)
5181 struct btrfs_path *path;
5183 struct extent_buffer *l;
5184 struct btrfs_key search_key;
5185 struct btrfs_key found_key;
5188 path = btrfs_alloc_path();
5192 search_key.objectid = BTRFS_LAST_FREE_OBJECTID;
5193 search_key.type = -1;
5194 search_key.offset = (u64)-1;
5195 ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0);
5198 BUG_ON(ret == 0); /* Corruption */
5199 if (path->slots[0] > 0) {
5200 slot = path->slots[0] - 1;
5202 btrfs_item_key_to_cpu(l, &found_key, slot);
5203 root->free_objectid = max_t(u64, found_key.objectid + 1,
5204 BTRFS_FIRST_FREE_OBJECTID);
5206 root->free_objectid = BTRFS_FIRST_FREE_OBJECTID;
5210 btrfs_free_path(path);
5214 int btrfs_get_free_objectid(struct btrfs_root *root, u64 *objectid)
5217 mutex_lock(&root->objectid_mutex);
5219 if (unlikely(root->free_objectid >= BTRFS_LAST_FREE_OBJECTID)) {
5220 btrfs_warn(root->fs_info,
5221 "the objectid of root %llu reaches its highest value",
5222 root->root_key.objectid);
5227 *objectid = root->free_objectid++;
5230 mutex_unlock(&root->objectid_mutex);