2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
20 #include <linux/blkdev.h>
21 #include <linux/scatterlist.h>
22 #include <linux/swap.h>
23 #include <linux/radix-tree.h>
24 #include <linux/writeback.h>
25 #include <linux/buffer_head.h>
26 #include <linux/workqueue.h>
27 #include <linux/kthread.h>
28 #include <linux/freezer.h>
29 #include <linux/slab.h>
30 #include <linux/migrate.h>
31 #include <linux/ratelimit.h>
32 #include <linux/uuid.h>
33 #include <linux/semaphore.h>
34 #include <asm/unaligned.h>
38 #include "transaction.h"
39 #include "btrfs_inode.h"
41 #include "print-tree.h"
44 #include "free-space-cache.h"
45 #include "inode-map.h"
46 #include "check-integrity.h"
47 #include "rcu-string.h"
48 #include "dev-replace.h"
54 #include <asm/cpufeature.h>
57 static struct extent_io_ops btree_extent_io_ops;
58 static void end_workqueue_fn(struct btrfs_work *work);
59 static void free_fs_root(struct btrfs_root *root);
60 static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info,
62 static void btrfs_destroy_ordered_extents(struct btrfs_root *root);
63 static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
64 struct btrfs_root *root);
65 static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root);
66 static int btrfs_destroy_marked_extents(struct btrfs_root *root,
67 struct extent_io_tree *dirty_pages,
69 static int btrfs_destroy_pinned_extent(struct btrfs_root *root,
70 struct extent_io_tree *pinned_extents);
71 static int btrfs_cleanup_transaction(struct btrfs_root *root);
72 static void btrfs_error_commit_super(struct btrfs_root *root);
75 * btrfs_end_io_wq structs are used to do processing in task context when an IO
76 * is complete. This is used during reads to verify checksums, and it is used
77 * by writes to insert metadata for new file extents after IO is complete.
79 struct btrfs_end_io_wq {
83 struct btrfs_fs_info *info;
85 enum btrfs_wq_endio_type metadata;
86 struct list_head list;
87 struct btrfs_work work;
90 static struct kmem_cache *btrfs_end_io_wq_cache;
92 int __init btrfs_end_io_wq_init(void)
94 btrfs_end_io_wq_cache = kmem_cache_create("btrfs_end_io_wq",
95 sizeof(struct btrfs_end_io_wq),
97 SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
99 if (!btrfs_end_io_wq_cache)
104 void btrfs_end_io_wq_exit(void)
106 if (btrfs_end_io_wq_cache)
107 kmem_cache_destroy(btrfs_end_io_wq_cache);
111 * async submit bios are used to offload expensive checksumming
112 * onto the worker threads. They checksum file and metadata bios
113 * just before they are sent down the IO stack.
115 struct async_submit_bio {
118 struct list_head list;
119 extent_submit_bio_hook_t *submit_bio_start;
120 extent_submit_bio_hook_t *submit_bio_done;
123 unsigned long bio_flags;
125 * bio_offset is optional, can be used if the pages in the bio
126 * can't tell us where in the file the bio should go
129 struct btrfs_work work;
134 * Lockdep class keys for extent_buffer->lock's in this root. For a given
135 * eb, the lockdep key is determined by the btrfs_root it belongs to and
136 * the level the eb occupies in the tree.
138 * Different roots are used for different purposes and may nest inside each
139 * other and they require separate keysets. As lockdep keys should be
140 * static, assign keysets according to the purpose of the root as indicated
141 * by btrfs_root->objectid. This ensures that all special purpose roots
142 * have separate keysets.
144 * Lock-nesting across peer nodes is always done with the immediate parent
145 * node locked thus preventing deadlock. As lockdep doesn't know this, use
146 * subclass to avoid triggering lockdep warning in such cases.
148 * The key is set by the readpage_end_io_hook after the buffer has passed
149 * csum validation but before the pages are unlocked. It is also set by
150 * btrfs_init_new_buffer on freshly allocated blocks.
152 * We also add a check to make sure the highest level of the tree is the
153 * same as our lockdep setup here. If BTRFS_MAX_LEVEL changes, this code
154 * needs update as well.
156 #ifdef CONFIG_DEBUG_LOCK_ALLOC
157 # if BTRFS_MAX_LEVEL != 8
161 static struct btrfs_lockdep_keyset {
162 u64 id; /* root objectid */
163 const char *name_stem; /* lock name stem */
164 char names[BTRFS_MAX_LEVEL + 1][20];
165 struct lock_class_key keys[BTRFS_MAX_LEVEL + 1];
166 } btrfs_lockdep_keysets[] = {
167 { .id = BTRFS_ROOT_TREE_OBJECTID, .name_stem = "root" },
168 { .id = BTRFS_EXTENT_TREE_OBJECTID, .name_stem = "extent" },
169 { .id = BTRFS_CHUNK_TREE_OBJECTID, .name_stem = "chunk" },
170 { .id = BTRFS_DEV_TREE_OBJECTID, .name_stem = "dev" },
171 { .id = BTRFS_FS_TREE_OBJECTID, .name_stem = "fs" },
172 { .id = BTRFS_CSUM_TREE_OBJECTID, .name_stem = "csum" },
173 { .id = BTRFS_QUOTA_TREE_OBJECTID, .name_stem = "quota" },
174 { .id = BTRFS_TREE_LOG_OBJECTID, .name_stem = "log" },
175 { .id = BTRFS_TREE_RELOC_OBJECTID, .name_stem = "treloc" },
176 { .id = BTRFS_DATA_RELOC_TREE_OBJECTID, .name_stem = "dreloc" },
177 { .id = BTRFS_UUID_TREE_OBJECTID, .name_stem = "uuid" },
178 { .id = 0, .name_stem = "tree" },
181 void __init btrfs_init_lockdep(void)
185 /* initialize lockdep class names */
186 for (i = 0; i < ARRAY_SIZE(btrfs_lockdep_keysets); i++) {
187 struct btrfs_lockdep_keyset *ks = &btrfs_lockdep_keysets[i];
189 for (j = 0; j < ARRAY_SIZE(ks->names); j++)
190 snprintf(ks->names[j], sizeof(ks->names[j]),
191 "btrfs-%s-%02d", ks->name_stem, j);
195 void btrfs_set_buffer_lockdep_class(u64 objectid, struct extent_buffer *eb,
198 struct btrfs_lockdep_keyset *ks;
200 BUG_ON(level >= ARRAY_SIZE(ks->keys));
202 /* find the matching keyset, id 0 is the default entry */
203 for (ks = btrfs_lockdep_keysets; ks->id; ks++)
204 if (ks->id == objectid)
207 lockdep_set_class_and_name(&eb->lock,
208 &ks->keys[level], ks->names[level]);
214 * extents on the btree inode are pretty simple, there's one extent
215 * that covers the entire device
217 static struct extent_map *btree_get_extent(struct inode *inode,
218 struct page *page, size_t pg_offset, u64 start, u64 len,
221 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
222 struct extent_map *em;
225 read_lock(&em_tree->lock);
226 em = lookup_extent_mapping(em_tree, start, len);
229 BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev;
230 read_unlock(&em_tree->lock);
233 read_unlock(&em_tree->lock);
235 em = alloc_extent_map();
237 em = ERR_PTR(-ENOMEM);
242 em->block_len = (u64)-1;
244 em->bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev;
246 write_lock(&em_tree->lock);
247 ret = add_extent_mapping(em_tree, em, 0);
248 if (ret == -EEXIST) {
250 em = lookup_extent_mapping(em_tree, start, len);
257 write_unlock(&em_tree->lock);
263 u32 btrfs_csum_data(char *data, u32 seed, size_t len)
265 return btrfs_crc32c(seed, data, len);
268 void btrfs_csum_final(u32 crc, char *result)
270 put_unaligned_le32(~crc, result);
274 * compute the csum for a btree block, and either verify it or write it
275 * into the csum field of the block.
277 static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
280 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
283 unsigned long cur_len;
284 unsigned long offset = BTRFS_CSUM_SIZE;
286 unsigned long map_start;
287 unsigned long map_len;
290 unsigned long inline_result;
292 len = buf->len - offset;
294 err = map_private_extent_buffer(buf, offset, 32,
295 &kaddr, &map_start, &map_len);
298 cur_len = min(len, map_len - (offset - map_start));
299 crc = btrfs_csum_data(kaddr + offset - map_start,
304 if (csum_size > sizeof(inline_result)) {
305 result = kzalloc(csum_size * sizeof(char), GFP_NOFS);
309 result = (char *)&inline_result;
312 btrfs_csum_final(crc, result);
315 if (memcmp_extent_buffer(buf, result, 0, csum_size)) {
318 memcpy(&found, result, csum_size);
320 read_extent_buffer(buf, &val, 0, csum_size);
321 printk_ratelimited(KERN_INFO
322 "BTRFS: %s checksum verify failed on %llu wanted %X found %X "
324 root->fs_info->sb->s_id, buf->start,
325 val, found, btrfs_header_level(buf));
326 if (result != (char *)&inline_result)
331 write_extent_buffer(buf, result, 0, csum_size);
333 if (result != (char *)&inline_result)
339 * we can't consider a given block up to date unless the transid of the
340 * block matches the transid in the parent node's pointer. This is how we
341 * detect blocks that either didn't get written at all or got written
342 * in the wrong place.
344 static int verify_parent_transid(struct extent_io_tree *io_tree,
345 struct extent_buffer *eb, u64 parent_transid,
348 struct extent_state *cached_state = NULL;
350 bool need_lock = (current->journal_info == BTRFS_SEND_TRANS_STUB);
352 if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
359 btrfs_tree_read_lock(eb);
360 btrfs_set_lock_blocking_rw(eb, BTRFS_READ_LOCK);
363 lock_extent_bits(io_tree, eb->start, eb->start + eb->len - 1,
365 if (extent_buffer_uptodate(eb) &&
366 btrfs_header_generation(eb) == parent_transid) {
370 printk_ratelimited(KERN_INFO "BTRFS (device %s): parent transid verify failed on %llu wanted %llu found %llu\n",
371 eb->fs_info->sb->s_id, eb->start,
372 parent_transid, btrfs_header_generation(eb));
376 * Things reading via commit roots that don't have normal protection,
377 * like send, can have a really old block in cache that may point at a
378 * block that has been free'd and re-allocated. So don't clear uptodate
379 * if we find an eb that is under IO (dirty/writeback) because we could
380 * end up reading in the stale data and then writing it back out and
381 * making everybody very sad.
383 if (!extent_buffer_under_io(eb))
384 clear_extent_buffer_uptodate(eb);
386 unlock_extent_cached(io_tree, eb->start, eb->start + eb->len - 1,
387 &cached_state, GFP_NOFS);
389 btrfs_tree_read_unlock_blocking(eb);
394 * Return 0 if the superblock checksum type matches the checksum value of that
395 * algorithm. Pass the raw disk superblock data.
397 static int btrfs_check_super_csum(char *raw_disk_sb)
399 struct btrfs_super_block *disk_sb =
400 (struct btrfs_super_block *)raw_disk_sb;
401 u16 csum_type = btrfs_super_csum_type(disk_sb);
404 if (csum_type == BTRFS_CSUM_TYPE_CRC32) {
406 const int csum_size = sizeof(crc);
407 char result[csum_size];
410 * The super_block structure does not span the whole
411 * BTRFS_SUPER_INFO_SIZE range, we expect that the unused space
412 * is filled with zeros and is included in the checkum.
414 crc = btrfs_csum_data(raw_disk_sb + BTRFS_CSUM_SIZE,
415 crc, BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
416 btrfs_csum_final(crc, result);
418 if (memcmp(raw_disk_sb, result, csum_size))
421 if (ret && btrfs_super_generation(disk_sb) < 10) {
423 "BTRFS: super block crcs don't match, older mkfs detected\n");
428 if (csum_type >= ARRAY_SIZE(btrfs_csum_sizes)) {
429 printk(KERN_ERR "BTRFS: unsupported checksum algorithm %u\n",
438 * helper to read a given tree block, doing retries as required when
439 * the checksums don't match and we have alternate mirrors to try.
441 static int btree_read_extent_buffer_pages(struct btrfs_root *root,
442 struct extent_buffer *eb,
443 u64 start, u64 parent_transid)
445 struct extent_io_tree *io_tree;
450 int failed_mirror = 0;
452 clear_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags);
453 io_tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree;
455 ret = read_extent_buffer_pages(io_tree, eb, start,
457 btree_get_extent, mirror_num);
459 if (!verify_parent_transid(io_tree, eb,
467 * This buffer's crc is fine, but its contents are corrupted, so
468 * there is no reason to read the other copies, they won't be
471 if (test_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags))
474 num_copies = btrfs_num_copies(root->fs_info,
479 if (!failed_mirror) {
481 failed_mirror = eb->read_mirror;
485 if (mirror_num == failed_mirror)
488 if (mirror_num > num_copies)
492 if (failed && !ret && failed_mirror)
493 repair_eb_io_failure(root, eb, failed_mirror);
499 * checksum a dirty tree block before IO. This has extra checks to make sure
500 * we only fill in the checksum field in the first page of a multi-page block
503 static int csum_dirty_buffer(struct btrfs_root *root, struct page *page)
505 u64 start = page_offset(page);
507 struct extent_buffer *eb;
509 eb = (struct extent_buffer *)page->private;
510 if (page != eb->pages[0])
512 found_start = btrfs_header_bytenr(eb);
513 if (WARN_ON(found_start != start || !PageUptodate(page)))
515 csum_tree_block(root, eb, 0);
519 static int check_tree_block_fsid(struct btrfs_root *root,
520 struct extent_buffer *eb)
522 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
523 u8 fsid[BTRFS_UUID_SIZE];
526 read_extent_buffer(eb, fsid, btrfs_header_fsid(), BTRFS_FSID_SIZE);
528 if (!memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE)) {
532 fs_devices = fs_devices->seed;
537 #define CORRUPT(reason, eb, root, slot) \
538 btrfs_crit(root->fs_info, "corrupt leaf, %s: block=%llu," \
539 "root=%llu, slot=%d", reason, \
540 btrfs_header_bytenr(eb), root->objectid, slot)
542 static noinline int check_leaf(struct btrfs_root *root,
543 struct extent_buffer *leaf)
545 struct btrfs_key key;
546 struct btrfs_key leaf_key;
547 u32 nritems = btrfs_header_nritems(leaf);
553 /* Check the 0 item */
554 if (btrfs_item_offset_nr(leaf, 0) + btrfs_item_size_nr(leaf, 0) !=
555 BTRFS_LEAF_DATA_SIZE(root)) {
556 CORRUPT("invalid item offset size pair", leaf, root, 0);
561 * Check to make sure each items keys are in the correct order and their
562 * offsets make sense. We only have to loop through nritems-1 because
563 * we check the current slot against the next slot, which verifies the
564 * next slot's offset+size makes sense and that the current's slot
567 for (slot = 0; slot < nritems - 1; slot++) {
568 btrfs_item_key_to_cpu(leaf, &leaf_key, slot);
569 btrfs_item_key_to_cpu(leaf, &key, slot + 1);
571 /* Make sure the keys are in the right order */
572 if (btrfs_comp_cpu_keys(&leaf_key, &key) >= 0) {
573 CORRUPT("bad key order", leaf, root, slot);
578 * Make sure the offset and ends are right, remember that the
579 * item data starts at the end of the leaf and grows towards the
582 if (btrfs_item_offset_nr(leaf, slot) !=
583 btrfs_item_end_nr(leaf, slot + 1)) {
584 CORRUPT("slot offset bad", leaf, root, slot);
589 * Check to make sure that we don't point outside of the leaf,
590 * just incase all the items are consistent to eachother, but
591 * all point outside of the leaf.
593 if (btrfs_item_end_nr(leaf, slot) >
594 BTRFS_LEAF_DATA_SIZE(root)) {
595 CORRUPT("slot end outside of leaf", leaf, root, slot);
603 static int btree_readpage_end_io_hook(struct btrfs_io_bio *io_bio,
604 u64 phy_offset, struct page *page,
605 u64 start, u64 end, int mirror)
609 struct extent_buffer *eb;
610 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
617 eb = (struct extent_buffer *)page->private;
619 /* the pending IO might have been the only thing that kept this buffer
620 * in memory. Make sure we have a ref for all this other checks
622 extent_buffer_get(eb);
624 reads_done = atomic_dec_and_test(&eb->io_pages);
628 eb->read_mirror = mirror;
629 if (test_bit(EXTENT_BUFFER_IOERR, &eb->bflags)) {
634 found_start = btrfs_header_bytenr(eb);
635 if (found_start != eb->start) {
636 printk_ratelimited(KERN_INFO "BTRFS (device %s): bad tree block start "
638 eb->fs_info->sb->s_id, found_start, eb->start);
642 if (check_tree_block_fsid(root, eb)) {
643 printk_ratelimited(KERN_INFO "BTRFS (device %s): bad fsid on block %llu\n",
644 eb->fs_info->sb->s_id, eb->start);
648 found_level = btrfs_header_level(eb);
649 if (found_level >= BTRFS_MAX_LEVEL) {
650 btrfs_info(root->fs_info, "bad tree block level %d",
651 (int)btrfs_header_level(eb));
656 btrfs_set_buffer_lockdep_class(btrfs_header_owner(eb),
659 ret = csum_tree_block(root, eb, 1);
666 * If this is a leaf block and it is corrupt, set the corrupt bit so
667 * that we don't try and read the other copies of this block, just
670 if (found_level == 0 && check_leaf(root, eb)) {
671 set_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags);
676 set_extent_buffer_uptodate(eb);
679 test_and_clear_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags))
680 btree_readahead_hook(root, eb, eb->start, ret);
684 * our io error hook is going to dec the io pages
685 * again, we have to make sure it has something
688 atomic_inc(&eb->io_pages);
689 clear_extent_buffer_uptodate(eb);
691 free_extent_buffer(eb);
696 static int btree_io_failed_hook(struct page *page, int failed_mirror)
698 struct extent_buffer *eb;
699 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
701 eb = (struct extent_buffer *)page->private;
702 set_bit(EXTENT_BUFFER_IOERR, &eb->bflags);
703 eb->read_mirror = failed_mirror;
704 atomic_dec(&eb->io_pages);
705 if (test_and_clear_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags))
706 btree_readahead_hook(root, eb, eb->start, -EIO);
707 return -EIO; /* we fixed nothing */
710 static void end_workqueue_bio(struct bio *bio, int err)
712 struct btrfs_end_io_wq *end_io_wq = bio->bi_private;
713 struct btrfs_fs_info *fs_info;
714 struct btrfs_workqueue *wq;
715 btrfs_work_func_t func;
717 fs_info = end_io_wq->info;
718 end_io_wq->error = err;
720 if (bio->bi_rw & REQ_WRITE) {
721 if (end_io_wq->metadata == BTRFS_WQ_ENDIO_METADATA) {
722 wq = fs_info->endio_meta_write_workers;
723 func = btrfs_endio_meta_write_helper;
724 } else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_FREE_SPACE) {
725 wq = fs_info->endio_freespace_worker;
726 func = btrfs_freespace_write_helper;
727 } else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_RAID56) {
728 wq = fs_info->endio_raid56_workers;
729 func = btrfs_endio_raid56_helper;
731 wq = fs_info->endio_write_workers;
732 func = btrfs_endio_write_helper;
735 if (unlikely(end_io_wq->metadata ==
736 BTRFS_WQ_ENDIO_DIO_REPAIR)) {
737 wq = fs_info->endio_repair_workers;
738 func = btrfs_endio_repair_helper;
739 } else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_RAID56) {
740 wq = fs_info->endio_raid56_workers;
741 func = btrfs_endio_raid56_helper;
742 } else if (end_io_wq->metadata) {
743 wq = fs_info->endio_meta_workers;
744 func = btrfs_endio_meta_helper;
746 wq = fs_info->endio_workers;
747 func = btrfs_endio_helper;
751 btrfs_init_work(&end_io_wq->work, func, end_workqueue_fn, NULL, NULL);
752 btrfs_queue_work(wq, &end_io_wq->work);
755 int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
756 enum btrfs_wq_endio_type metadata)
758 struct btrfs_end_io_wq *end_io_wq;
760 end_io_wq = kmem_cache_alloc(btrfs_end_io_wq_cache, GFP_NOFS);
764 end_io_wq->private = bio->bi_private;
765 end_io_wq->end_io = bio->bi_end_io;
766 end_io_wq->info = info;
767 end_io_wq->error = 0;
768 end_io_wq->bio = bio;
769 end_io_wq->metadata = metadata;
771 bio->bi_private = end_io_wq;
772 bio->bi_end_io = end_workqueue_bio;
776 unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info)
778 unsigned long limit = min_t(unsigned long,
779 info->thread_pool_size,
780 info->fs_devices->open_devices);
784 static void run_one_async_start(struct btrfs_work *work)
786 struct async_submit_bio *async;
789 async = container_of(work, struct async_submit_bio, work);
790 ret = async->submit_bio_start(async->inode, async->rw, async->bio,
791 async->mirror_num, async->bio_flags,
797 static void run_one_async_done(struct btrfs_work *work)
799 struct btrfs_fs_info *fs_info;
800 struct async_submit_bio *async;
803 async = container_of(work, struct async_submit_bio, work);
804 fs_info = BTRFS_I(async->inode)->root->fs_info;
806 limit = btrfs_async_submit_limit(fs_info);
807 limit = limit * 2 / 3;
809 if (atomic_dec_return(&fs_info->nr_async_submits) < limit &&
810 waitqueue_active(&fs_info->async_submit_wait))
811 wake_up(&fs_info->async_submit_wait);
813 /* If an error occured we just want to clean up the bio and move on */
815 bio_endio(async->bio, async->error);
819 async->submit_bio_done(async->inode, async->rw, async->bio,
820 async->mirror_num, async->bio_flags,
824 static void run_one_async_free(struct btrfs_work *work)
826 struct async_submit_bio *async;
828 async = container_of(work, struct async_submit_bio, work);
832 int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
833 int rw, struct bio *bio, int mirror_num,
834 unsigned long bio_flags,
836 extent_submit_bio_hook_t *submit_bio_start,
837 extent_submit_bio_hook_t *submit_bio_done)
839 struct async_submit_bio *async;
841 async = kmalloc(sizeof(*async), GFP_NOFS);
845 async->inode = inode;
848 async->mirror_num = mirror_num;
849 async->submit_bio_start = submit_bio_start;
850 async->submit_bio_done = submit_bio_done;
852 btrfs_init_work(&async->work, btrfs_worker_helper, run_one_async_start,
853 run_one_async_done, run_one_async_free);
855 async->bio_flags = bio_flags;
856 async->bio_offset = bio_offset;
860 atomic_inc(&fs_info->nr_async_submits);
863 btrfs_set_work_high_priority(&async->work);
865 btrfs_queue_work(fs_info->workers, &async->work);
867 while (atomic_read(&fs_info->async_submit_draining) &&
868 atomic_read(&fs_info->nr_async_submits)) {
869 wait_event(fs_info->async_submit_wait,
870 (atomic_read(&fs_info->nr_async_submits) == 0));
876 static int btree_csum_one_bio(struct bio *bio)
878 struct bio_vec *bvec;
879 struct btrfs_root *root;
882 bio_for_each_segment_all(bvec, bio, i) {
883 root = BTRFS_I(bvec->bv_page->mapping->host)->root;
884 ret = csum_dirty_buffer(root, bvec->bv_page);
892 static int __btree_submit_bio_start(struct inode *inode, int rw,
893 struct bio *bio, int mirror_num,
894 unsigned long bio_flags,
898 * when we're called for a write, we're already in the async
899 * submission context. Just jump into btrfs_map_bio
901 return btree_csum_one_bio(bio);
904 static int __btree_submit_bio_done(struct inode *inode, int rw, struct bio *bio,
905 int mirror_num, unsigned long bio_flags,
911 * when we're called for a write, we're already in the async
912 * submission context. Just jump into btrfs_map_bio
914 ret = btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num, 1);
920 static int check_async_write(struct inode *inode, unsigned long bio_flags)
922 if (bio_flags & EXTENT_BIO_TREE_LOG)
931 static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
932 int mirror_num, unsigned long bio_flags,
935 int async = check_async_write(inode, bio_flags);
938 if (!(rw & REQ_WRITE)) {
940 * called for a read, do the setup so that checksum validation
941 * can happen in the async kernel threads
943 ret = btrfs_bio_wq_end_io(BTRFS_I(inode)->root->fs_info,
944 bio, BTRFS_WQ_ENDIO_METADATA);
947 ret = btrfs_map_bio(BTRFS_I(inode)->root, rw, bio,
950 ret = btree_csum_one_bio(bio);
953 ret = btrfs_map_bio(BTRFS_I(inode)->root, rw, bio,
957 * kthread helpers are used to submit writes so that
958 * checksumming can happen in parallel across all CPUs
960 ret = btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info,
961 inode, rw, bio, mirror_num, 0,
963 __btree_submit_bio_start,
964 __btree_submit_bio_done);
974 #ifdef CONFIG_MIGRATION
975 static int btree_migratepage(struct address_space *mapping,
976 struct page *newpage, struct page *page,
977 enum migrate_mode mode)
980 * we can't safely write a btree page from here,
981 * we haven't done the locking hook
986 * Buffers may be managed in a filesystem specific way.
987 * We must have no buffers or drop them.
989 if (page_has_private(page) &&
990 !try_to_release_page(page, GFP_KERNEL))
992 return migrate_page(mapping, newpage, page, mode);
997 static int btree_writepages(struct address_space *mapping,
998 struct writeback_control *wbc)
1000 struct btrfs_fs_info *fs_info;
1003 if (wbc->sync_mode == WB_SYNC_NONE) {
1005 if (wbc->for_kupdate)
1008 fs_info = BTRFS_I(mapping->host)->root->fs_info;
1009 /* this is a bit racy, but that's ok */
1010 ret = percpu_counter_compare(&fs_info->dirty_metadata_bytes,
1011 BTRFS_DIRTY_METADATA_THRESH);
1015 return btree_write_cache_pages(mapping, wbc);
1018 static int btree_readpage(struct file *file, struct page *page)
1020 struct extent_io_tree *tree;
1021 tree = &BTRFS_I(page->mapping->host)->io_tree;
1022 return extent_read_full_page(tree, page, btree_get_extent, 0);
1025 static int btree_releasepage(struct page *page, gfp_t gfp_flags)
1027 if (PageWriteback(page) || PageDirty(page))
1030 return try_release_extent_buffer(page);
1033 static void btree_invalidatepage(struct page *page, unsigned int offset,
1034 unsigned int length)
1036 struct extent_io_tree *tree;
1037 tree = &BTRFS_I(page->mapping->host)->io_tree;
1038 extent_invalidatepage(tree, page, offset);
1039 btree_releasepage(page, GFP_NOFS);
1040 if (PagePrivate(page)) {
1041 btrfs_warn(BTRFS_I(page->mapping->host)->root->fs_info,
1042 "page private not zero on page %llu",
1043 (unsigned long long)page_offset(page));
1044 ClearPagePrivate(page);
1045 set_page_private(page, 0);
1046 page_cache_release(page);
1050 static int btree_set_page_dirty(struct page *page)
1053 struct extent_buffer *eb;
1055 BUG_ON(!PagePrivate(page));
1056 eb = (struct extent_buffer *)page->private;
1058 BUG_ON(!test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags));
1059 BUG_ON(!atomic_read(&eb->refs));
1060 btrfs_assert_tree_locked(eb);
1062 return __set_page_dirty_nobuffers(page);
1065 static const struct address_space_operations btree_aops = {
1066 .readpage = btree_readpage,
1067 .writepages = btree_writepages,
1068 .releasepage = btree_releasepage,
1069 .invalidatepage = btree_invalidatepage,
1070 #ifdef CONFIG_MIGRATION
1071 .migratepage = btree_migratepage,
1073 .set_page_dirty = btree_set_page_dirty,
1076 int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
1079 struct extent_buffer *buf = NULL;
1080 struct inode *btree_inode = root->fs_info->btree_inode;
1083 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
1086 read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree,
1087 buf, 0, WAIT_NONE, btree_get_extent, 0);
1088 free_extent_buffer(buf);
1092 int reada_tree_block_flagged(struct btrfs_root *root, u64 bytenr, u32 blocksize,
1093 int mirror_num, struct extent_buffer **eb)
1095 struct extent_buffer *buf = NULL;
1096 struct inode *btree_inode = root->fs_info->btree_inode;
1097 struct extent_io_tree *io_tree = &BTRFS_I(btree_inode)->io_tree;
1100 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
1104 set_bit(EXTENT_BUFFER_READAHEAD, &buf->bflags);
1106 ret = read_extent_buffer_pages(io_tree, buf, 0, WAIT_PAGE_LOCK,
1107 btree_get_extent, mirror_num);
1109 free_extent_buffer(buf);
1113 if (test_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags)) {
1114 free_extent_buffer(buf);
1116 } else if (extent_buffer_uptodate(buf)) {
1119 free_extent_buffer(buf);
1124 struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
1125 u64 bytenr, u32 blocksize)
1127 return find_extent_buffer(root->fs_info, bytenr);
1130 struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
1131 u64 bytenr, u32 blocksize)
1133 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1134 if (unlikely(test_bit(BTRFS_ROOT_DUMMY_ROOT, &root->state)))
1135 return alloc_test_extent_buffer(root->fs_info, bytenr,
1138 return alloc_extent_buffer(root->fs_info, bytenr, blocksize);
1142 int btrfs_write_tree_block(struct extent_buffer *buf)
1144 return filemap_fdatawrite_range(buf->pages[0]->mapping, buf->start,
1145 buf->start + buf->len - 1);
1148 int btrfs_wait_tree_block_writeback(struct extent_buffer *buf)
1150 return filemap_fdatawait_range(buf->pages[0]->mapping,
1151 buf->start, buf->start + buf->len - 1);
1154 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
1155 u32 blocksize, u64 parent_transid)
1157 struct extent_buffer *buf = NULL;
1160 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
1164 ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid);
1166 free_extent_buffer(buf);
1173 void clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1174 struct extent_buffer *buf)
1176 struct btrfs_fs_info *fs_info = root->fs_info;
1178 if (btrfs_header_generation(buf) ==
1179 fs_info->running_transaction->transid) {
1180 btrfs_assert_tree_locked(buf);
1182 if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)) {
1183 __percpu_counter_add(&fs_info->dirty_metadata_bytes,
1185 fs_info->dirty_metadata_batch);
1186 /* ugh, clear_extent_buffer_dirty needs to lock the page */
1187 btrfs_set_lock_blocking(buf);
1188 clear_extent_buffer_dirty(buf);
1193 static struct btrfs_subvolume_writers *btrfs_alloc_subvolume_writers(void)
1195 struct btrfs_subvolume_writers *writers;
1198 writers = kmalloc(sizeof(*writers), GFP_NOFS);
1200 return ERR_PTR(-ENOMEM);
1202 ret = percpu_counter_init(&writers->counter, 0);
1205 return ERR_PTR(ret);
1208 init_waitqueue_head(&writers->wait);
1213 btrfs_free_subvolume_writers(struct btrfs_subvolume_writers *writers)
1215 percpu_counter_destroy(&writers->counter);
1219 static void __setup_root(u32 nodesize, u32 sectorsize, u32 stripesize,
1220 struct btrfs_root *root, struct btrfs_fs_info *fs_info,
1224 root->commit_root = NULL;
1225 root->sectorsize = sectorsize;
1226 root->nodesize = nodesize;
1227 root->stripesize = stripesize;
1229 root->orphan_cleanup_state = 0;
1231 root->objectid = objectid;
1232 root->last_trans = 0;
1233 root->highest_objectid = 0;
1234 root->nr_delalloc_inodes = 0;
1235 root->nr_ordered_extents = 0;
1237 root->inode_tree = RB_ROOT;
1238 INIT_RADIX_TREE(&root->delayed_nodes_tree, GFP_ATOMIC);
1239 root->block_rsv = NULL;
1240 root->orphan_block_rsv = NULL;
1242 INIT_LIST_HEAD(&root->dirty_list);
1243 INIT_LIST_HEAD(&root->root_list);
1244 INIT_LIST_HEAD(&root->delalloc_inodes);
1245 INIT_LIST_HEAD(&root->delalloc_root);
1246 INIT_LIST_HEAD(&root->ordered_extents);
1247 INIT_LIST_HEAD(&root->ordered_root);
1248 INIT_LIST_HEAD(&root->logged_list[0]);
1249 INIT_LIST_HEAD(&root->logged_list[1]);
1250 spin_lock_init(&root->orphan_lock);
1251 spin_lock_init(&root->inode_lock);
1252 spin_lock_init(&root->delalloc_lock);
1253 spin_lock_init(&root->ordered_extent_lock);
1254 spin_lock_init(&root->accounting_lock);
1255 spin_lock_init(&root->log_extents_lock[0]);
1256 spin_lock_init(&root->log_extents_lock[1]);
1257 mutex_init(&root->objectid_mutex);
1258 mutex_init(&root->log_mutex);
1259 mutex_init(&root->ordered_extent_mutex);
1260 mutex_init(&root->delalloc_mutex);
1261 init_waitqueue_head(&root->log_writer_wait);
1262 init_waitqueue_head(&root->log_commit_wait[0]);
1263 init_waitqueue_head(&root->log_commit_wait[1]);
1264 INIT_LIST_HEAD(&root->log_ctxs[0]);
1265 INIT_LIST_HEAD(&root->log_ctxs[1]);
1266 atomic_set(&root->log_commit[0], 0);
1267 atomic_set(&root->log_commit[1], 0);
1268 atomic_set(&root->log_writers, 0);
1269 atomic_set(&root->log_batch, 0);
1270 atomic_set(&root->orphan_inodes, 0);
1271 atomic_set(&root->refs, 1);
1272 atomic_set(&root->will_be_snapshoted, 0);
1273 root->log_transid = 0;
1274 root->log_transid_committed = -1;
1275 root->last_log_commit = 0;
1277 extent_io_tree_init(&root->dirty_log_pages,
1278 fs_info->btree_inode->i_mapping);
1280 memset(&root->root_key, 0, sizeof(root->root_key));
1281 memset(&root->root_item, 0, sizeof(root->root_item));
1282 memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
1283 memset(&root->root_kobj, 0, sizeof(root->root_kobj));
1285 root->defrag_trans_start = fs_info->generation;
1287 root->defrag_trans_start = 0;
1288 init_completion(&root->kobj_unregister);
1289 root->root_key.objectid = objectid;
1292 spin_lock_init(&root->root_item_lock);
1295 static struct btrfs_root *btrfs_alloc_root(struct btrfs_fs_info *fs_info)
1297 struct btrfs_root *root = kzalloc(sizeof(*root), GFP_NOFS);
1299 root->fs_info = fs_info;
1303 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1304 /* Should only be used by the testing infrastructure */
1305 struct btrfs_root *btrfs_alloc_dummy_root(void)
1307 struct btrfs_root *root;
1309 root = btrfs_alloc_root(NULL);
1311 return ERR_PTR(-ENOMEM);
1312 __setup_root(4096, 4096, 4096, root, NULL, 1);
1313 set_bit(BTRFS_ROOT_DUMMY_ROOT, &root->state);
1314 root->alloc_bytenr = 0;
1320 struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans,
1321 struct btrfs_fs_info *fs_info,
1324 struct extent_buffer *leaf;
1325 struct btrfs_root *tree_root = fs_info->tree_root;
1326 struct btrfs_root *root;
1327 struct btrfs_key key;
1331 root = btrfs_alloc_root(fs_info);
1333 return ERR_PTR(-ENOMEM);
1335 __setup_root(tree_root->nodesize, tree_root->sectorsize,
1336 tree_root->stripesize, root, fs_info, objectid);
1337 root->root_key.objectid = objectid;
1338 root->root_key.type = BTRFS_ROOT_ITEM_KEY;
1339 root->root_key.offset = 0;
1341 leaf = btrfs_alloc_free_block(trans, root, root->nodesize,
1342 0, objectid, NULL, 0, 0, 0);
1344 ret = PTR_ERR(leaf);
1349 memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
1350 btrfs_set_header_bytenr(leaf, leaf->start);
1351 btrfs_set_header_generation(leaf, trans->transid);
1352 btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
1353 btrfs_set_header_owner(leaf, objectid);
1356 write_extent_buffer(leaf, fs_info->fsid, btrfs_header_fsid(),
1358 write_extent_buffer(leaf, fs_info->chunk_tree_uuid,
1359 btrfs_header_chunk_tree_uuid(leaf),
1361 btrfs_mark_buffer_dirty(leaf);
1363 root->commit_root = btrfs_root_node(root);
1364 set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state);
1366 root->root_item.flags = 0;
1367 root->root_item.byte_limit = 0;
1368 btrfs_set_root_bytenr(&root->root_item, leaf->start);
1369 btrfs_set_root_generation(&root->root_item, trans->transid);
1370 btrfs_set_root_level(&root->root_item, 0);
1371 btrfs_set_root_refs(&root->root_item, 1);
1372 btrfs_set_root_used(&root->root_item, leaf->len);
1373 btrfs_set_root_last_snapshot(&root->root_item, 0);
1374 btrfs_set_root_dirid(&root->root_item, 0);
1376 memcpy(root->root_item.uuid, uuid.b, BTRFS_UUID_SIZE);
1377 root->root_item.drop_level = 0;
1379 key.objectid = objectid;
1380 key.type = BTRFS_ROOT_ITEM_KEY;
1382 ret = btrfs_insert_root(trans, tree_root, &key, &root->root_item);
1386 btrfs_tree_unlock(leaf);
1392 btrfs_tree_unlock(leaf);
1393 free_extent_buffer(root->commit_root);
1394 free_extent_buffer(leaf);
1398 return ERR_PTR(ret);
1401 static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans,
1402 struct btrfs_fs_info *fs_info)
1404 struct btrfs_root *root;
1405 struct btrfs_root *tree_root = fs_info->tree_root;
1406 struct extent_buffer *leaf;
1408 root = btrfs_alloc_root(fs_info);
1410 return ERR_PTR(-ENOMEM);
1412 __setup_root(tree_root->nodesize, tree_root->sectorsize,
1413 tree_root->stripesize, root, fs_info,
1414 BTRFS_TREE_LOG_OBJECTID);
1416 root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID;
1417 root->root_key.type = BTRFS_ROOT_ITEM_KEY;
1418 root->root_key.offset = BTRFS_TREE_LOG_OBJECTID;
1421 * DON'T set REF_COWS for log trees
1423 * log trees do not get reference counted because they go away
1424 * before a real commit is actually done. They do store pointers
1425 * to file data extents, and those reference counts still get
1426 * updated (along with back refs to the log tree).
1429 leaf = btrfs_alloc_free_block(trans, root, root->nodesize, 0,
1430 BTRFS_TREE_LOG_OBJECTID, NULL,
1434 return ERR_CAST(leaf);
1437 memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
1438 btrfs_set_header_bytenr(leaf, leaf->start);
1439 btrfs_set_header_generation(leaf, trans->transid);
1440 btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
1441 btrfs_set_header_owner(leaf, BTRFS_TREE_LOG_OBJECTID);
1444 write_extent_buffer(root->node, root->fs_info->fsid,
1445 btrfs_header_fsid(), BTRFS_FSID_SIZE);
1446 btrfs_mark_buffer_dirty(root->node);
1447 btrfs_tree_unlock(root->node);
1451 int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
1452 struct btrfs_fs_info *fs_info)
1454 struct btrfs_root *log_root;
1456 log_root = alloc_log_tree(trans, fs_info);
1457 if (IS_ERR(log_root))
1458 return PTR_ERR(log_root);
1459 WARN_ON(fs_info->log_root_tree);
1460 fs_info->log_root_tree = log_root;
1464 int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
1465 struct btrfs_root *root)
1467 struct btrfs_root *log_root;
1468 struct btrfs_inode_item *inode_item;
1470 log_root = alloc_log_tree(trans, root->fs_info);
1471 if (IS_ERR(log_root))
1472 return PTR_ERR(log_root);
1474 log_root->last_trans = trans->transid;
1475 log_root->root_key.offset = root->root_key.objectid;
1477 inode_item = &log_root->root_item.inode;
1478 btrfs_set_stack_inode_generation(inode_item, 1);
1479 btrfs_set_stack_inode_size(inode_item, 3);
1480 btrfs_set_stack_inode_nlink(inode_item, 1);
1481 btrfs_set_stack_inode_nbytes(inode_item, root->nodesize);
1482 btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755);
1484 btrfs_set_root_node(&log_root->root_item, log_root->node);
1486 WARN_ON(root->log_root);
1487 root->log_root = log_root;
1488 root->log_transid = 0;
1489 root->log_transid_committed = -1;
1490 root->last_log_commit = 0;
1494 static struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root,
1495 struct btrfs_key *key)
1497 struct btrfs_root *root;
1498 struct btrfs_fs_info *fs_info = tree_root->fs_info;
1499 struct btrfs_path *path;
1504 path = btrfs_alloc_path();
1506 return ERR_PTR(-ENOMEM);
1508 root = btrfs_alloc_root(fs_info);
1514 __setup_root(tree_root->nodesize, tree_root->sectorsize,
1515 tree_root->stripesize, root, fs_info, key->objectid);
1517 ret = btrfs_find_root(tree_root, key, path,
1518 &root->root_item, &root->root_key);
1525 generation = btrfs_root_generation(&root->root_item);
1526 blocksize = root->nodesize;
1527 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
1528 blocksize, generation);
1532 } else if (!btrfs_buffer_uptodate(root->node, generation, 0)) {
1536 root->commit_root = btrfs_root_node(root);
1538 btrfs_free_path(path);
1542 free_extent_buffer(root->node);
1546 root = ERR_PTR(ret);
1550 struct btrfs_root *btrfs_read_fs_root(struct btrfs_root *tree_root,
1551 struct btrfs_key *location)
1553 struct btrfs_root *root;
1555 root = btrfs_read_tree_root(tree_root, location);
1559 if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) {
1560 set_bit(BTRFS_ROOT_REF_COWS, &root->state);
1561 btrfs_check_and_init_root_item(&root->root_item);
1567 int btrfs_init_fs_root(struct btrfs_root *root)
1570 struct btrfs_subvolume_writers *writers;
1572 root->free_ino_ctl = kzalloc(sizeof(*root->free_ino_ctl), GFP_NOFS);
1573 root->free_ino_pinned = kzalloc(sizeof(*root->free_ino_pinned),
1575 if (!root->free_ino_pinned || !root->free_ino_ctl) {
1580 writers = btrfs_alloc_subvolume_writers();
1581 if (IS_ERR(writers)) {
1582 ret = PTR_ERR(writers);
1585 root->subv_writers = writers;
1587 btrfs_init_free_ino_ctl(root);
1588 spin_lock_init(&root->ino_cache_lock);
1589 init_waitqueue_head(&root->ino_cache_wait);
1591 ret = get_anon_bdev(&root->anon_dev);
1597 btrfs_free_subvolume_writers(root->subv_writers);
1599 kfree(root->free_ino_ctl);
1600 kfree(root->free_ino_pinned);
1604 static struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
1607 struct btrfs_root *root;
1609 spin_lock(&fs_info->fs_roots_radix_lock);
1610 root = radix_tree_lookup(&fs_info->fs_roots_radix,
1611 (unsigned long)root_id);
1612 spin_unlock(&fs_info->fs_roots_radix_lock);
1616 int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info,
1617 struct btrfs_root *root)
1621 ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM);
1625 spin_lock(&fs_info->fs_roots_radix_lock);
1626 ret = radix_tree_insert(&fs_info->fs_roots_radix,
1627 (unsigned long)root->root_key.objectid,
1630 set_bit(BTRFS_ROOT_IN_RADIX, &root->state);
1631 spin_unlock(&fs_info->fs_roots_radix_lock);
1632 radix_tree_preload_end();
1637 struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info,
1638 struct btrfs_key *location,
1641 struct btrfs_root *root;
1644 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
1645 return fs_info->tree_root;
1646 if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
1647 return fs_info->extent_root;
1648 if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
1649 return fs_info->chunk_root;
1650 if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
1651 return fs_info->dev_root;
1652 if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
1653 return fs_info->csum_root;
1654 if (location->objectid == BTRFS_QUOTA_TREE_OBJECTID)
1655 return fs_info->quota_root ? fs_info->quota_root :
1657 if (location->objectid == BTRFS_UUID_TREE_OBJECTID)
1658 return fs_info->uuid_root ? fs_info->uuid_root :
1661 root = btrfs_lookup_fs_root(fs_info, location->objectid);
1663 if (check_ref && btrfs_root_refs(&root->root_item) == 0)
1664 return ERR_PTR(-ENOENT);
1668 root = btrfs_read_fs_root(fs_info->tree_root, location);
1672 if (check_ref && btrfs_root_refs(&root->root_item) == 0) {
1677 ret = btrfs_init_fs_root(root);
1681 ret = btrfs_find_item(fs_info->tree_root, NULL, BTRFS_ORPHAN_OBJECTID,
1682 location->objectid, BTRFS_ORPHAN_ITEM_KEY, NULL);
1686 set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state);
1688 ret = btrfs_insert_fs_root(fs_info, root);
1690 if (ret == -EEXIST) {
1699 return ERR_PTR(ret);
1702 static int btrfs_congested_fn(void *congested_data, int bdi_bits)
1704 struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data;
1706 struct btrfs_device *device;
1707 struct backing_dev_info *bdi;
1710 list_for_each_entry_rcu(device, &info->fs_devices->devices, dev_list) {
1713 bdi = blk_get_backing_dev_info(device->bdev);
1714 if (bdi && bdi_congested(bdi, bdi_bits)) {
1723 static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi)
1727 bdi->capabilities = BDI_CAP_MAP_COPY;
1728 err = bdi_setup_and_register(bdi, "btrfs", BDI_CAP_MAP_COPY);
1732 bdi->ra_pages = default_backing_dev_info.ra_pages;
1733 bdi->congested_fn = btrfs_congested_fn;
1734 bdi->congested_data = info;
1739 * called by the kthread helper functions to finally call the bio end_io
1740 * functions. This is where read checksum verification actually happens
1742 static void end_workqueue_fn(struct btrfs_work *work)
1745 struct btrfs_end_io_wq *end_io_wq;
1748 end_io_wq = container_of(work, struct btrfs_end_io_wq, work);
1749 bio = end_io_wq->bio;
1751 error = end_io_wq->error;
1752 bio->bi_private = end_io_wq->private;
1753 bio->bi_end_io = end_io_wq->end_io;
1754 kmem_cache_free(btrfs_end_io_wq_cache, end_io_wq);
1755 bio_endio_nodec(bio, error);
1758 static int cleaner_kthread(void *arg)
1760 struct btrfs_root *root = arg;
1766 /* Make the cleaner go to sleep early. */
1767 if (btrfs_need_cleaner_sleep(root))
1770 if (!mutex_trylock(&root->fs_info->cleaner_mutex))
1774 * Avoid the problem that we change the status of the fs
1775 * during the above check and trylock.
1777 if (btrfs_need_cleaner_sleep(root)) {
1778 mutex_unlock(&root->fs_info->cleaner_mutex);
1782 btrfs_run_delayed_iputs(root);
1783 btrfs_delete_unused_bgs(root->fs_info);
1784 again = btrfs_clean_one_deleted_snapshot(root);
1785 mutex_unlock(&root->fs_info->cleaner_mutex);
1788 * The defragger has dealt with the R/O remount and umount,
1789 * needn't do anything special here.
1791 btrfs_run_defrag_inodes(root->fs_info);
1793 if (!try_to_freeze() && !again) {
1794 set_current_state(TASK_INTERRUPTIBLE);
1795 if (!kthread_should_stop())
1797 __set_current_state(TASK_RUNNING);
1799 } while (!kthread_should_stop());
1803 static int transaction_kthread(void *arg)
1805 struct btrfs_root *root = arg;
1806 struct btrfs_trans_handle *trans;
1807 struct btrfs_transaction *cur;
1810 unsigned long delay;
1814 cannot_commit = false;
1815 delay = HZ * root->fs_info->commit_interval;
1816 mutex_lock(&root->fs_info->transaction_kthread_mutex);
1818 spin_lock(&root->fs_info->trans_lock);
1819 cur = root->fs_info->running_transaction;
1821 spin_unlock(&root->fs_info->trans_lock);
1825 now = get_seconds();
1826 if (cur->state < TRANS_STATE_BLOCKED &&
1827 (now < cur->start_time ||
1828 now - cur->start_time < root->fs_info->commit_interval)) {
1829 spin_unlock(&root->fs_info->trans_lock);
1833 transid = cur->transid;
1834 spin_unlock(&root->fs_info->trans_lock);
1836 /* If the file system is aborted, this will always fail. */
1837 trans = btrfs_attach_transaction(root);
1838 if (IS_ERR(trans)) {
1839 if (PTR_ERR(trans) != -ENOENT)
1840 cannot_commit = true;
1843 if (transid == trans->transid) {
1844 btrfs_commit_transaction(trans, root);
1846 btrfs_end_transaction(trans, root);
1849 wake_up_process(root->fs_info->cleaner_kthread);
1850 mutex_unlock(&root->fs_info->transaction_kthread_mutex);
1852 if (unlikely(test_bit(BTRFS_FS_STATE_ERROR,
1853 &root->fs_info->fs_state)))
1854 btrfs_cleanup_transaction(root);
1855 if (!try_to_freeze()) {
1856 set_current_state(TASK_INTERRUPTIBLE);
1857 if (!kthread_should_stop() &&
1858 (!btrfs_transaction_blocked(root->fs_info) ||
1860 schedule_timeout(delay);
1861 __set_current_state(TASK_RUNNING);
1863 } while (!kthread_should_stop());
1868 * this will find the highest generation in the array of
1869 * root backups. The index of the highest array is returned,
1870 * or -1 if we can't find anything.
1872 * We check to make sure the array is valid by comparing the
1873 * generation of the latest root in the array with the generation
1874 * in the super block. If they don't match we pitch it.
1876 static int find_newest_super_backup(struct btrfs_fs_info *info, u64 newest_gen)
1879 int newest_index = -1;
1880 struct btrfs_root_backup *root_backup;
1883 for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
1884 root_backup = info->super_copy->super_roots + i;
1885 cur = btrfs_backup_tree_root_gen(root_backup);
1886 if (cur == newest_gen)
1890 /* check to see if we actually wrapped around */
1891 if (newest_index == BTRFS_NUM_BACKUP_ROOTS - 1) {
1892 root_backup = info->super_copy->super_roots;
1893 cur = btrfs_backup_tree_root_gen(root_backup);
1894 if (cur == newest_gen)
1897 return newest_index;
1902 * find the oldest backup so we know where to store new entries
1903 * in the backup array. This will set the backup_root_index
1904 * field in the fs_info struct
1906 static void find_oldest_super_backup(struct btrfs_fs_info *info,
1909 int newest_index = -1;
1911 newest_index = find_newest_super_backup(info, newest_gen);
1912 /* if there was garbage in there, just move along */
1913 if (newest_index == -1) {
1914 info->backup_root_index = 0;
1916 info->backup_root_index = (newest_index + 1) % BTRFS_NUM_BACKUP_ROOTS;
1921 * copy all the root pointers into the super backup array.
1922 * this will bump the backup pointer by one when it is
1925 static void backup_super_roots(struct btrfs_fs_info *info)
1928 struct btrfs_root_backup *root_backup;
1931 next_backup = info->backup_root_index;
1932 last_backup = (next_backup + BTRFS_NUM_BACKUP_ROOTS - 1) %
1933 BTRFS_NUM_BACKUP_ROOTS;
1936 * just overwrite the last backup if we're at the same generation
1937 * this happens only at umount
1939 root_backup = info->super_for_commit->super_roots + last_backup;
1940 if (btrfs_backup_tree_root_gen(root_backup) ==
1941 btrfs_header_generation(info->tree_root->node))
1942 next_backup = last_backup;
1944 root_backup = info->super_for_commit->super_roots + next_backup;
1947 * make sure all of our padding and empty slots get zero filled
1948 * regardless of which ones we use today
1950 memset(root_backup, 0, sizeof(*root_backup));
1952 info->backup_root_index = (next_backup + 1) % BTRFS_NUM_BACKUP_ROOTS;
1954 btrfs_set_backup_tree_root(root_backup, info->tree_root->node->start);
1955 btrfs_set_backup_tree_root_gen(root_backup,
1956 btrfs_header_generation(info->tree_root->node));
1958 btrfs_set_backup_tree_root_level(root_backup,
1959 btrfs_header_level(info->tree_root->node));
1961 btrfs_set_backup_chunk_root(root_backup, info->chunk_root->node->start);
1962 btrfs_set_backup_chunk_root_gen(root_backup,
1963 btrfs_header_generation(info->chunk_root->node));
1964 btrfs_set_backup_chunk_root_level(root_backup,
1965 btrfs_header_level(info->chunk_root->node));
1967 btrfs_set_backup_extent_root(root_backup, info->extent_root->node->start);
1968 btrfs_set_backup_extent_root_gen(root_backup,
1969 btrfs_header_generation(info->extent_root->node));
1970 btrfs_set_backup_extent_root_level(root_backup,
1971 btrfs_header_level(info->extent_root->node));
1974 * we might commit during log recovery, which happens before we set
1975 * the fs_root. Make sure it is valid before we fill it in.
1977 if (info->fs_root && info->fs_root->node) {
1978 btrfs_set_backup_fs_root(root_backup,
1979 info->fs_root->node->start);
1980 btrfs_set_backup_fs_root_gen(root_backup,
1981 btrfs_header_generation(info->fs_root->node));
1982 btrfs_set_backup_fs_root_level(root_backup,
1983 btrfs_header_level(info->fs_root->node));
1986 btrfs_set_backup_dev_root(root_backup, info->dev_root->node->start);
1987 btrfs_set_backup_dev_root_gen(root_backup,
1988 btrfs_header_generation(info->dev_root->node));
1989 btrfs_set_backup_dev_root_level(root_backup,
1990 btrfs_header_level(info->dev_root->node));
1992 btrfs_set_backup_csum_root(root_backup, info->csum_root->node->start);
1993 btrfs_set_backup_csum_root_gen(root_backup,
1994 btrfs_header_generation(info->csum_root->node));
1995 btrfs_set_backup_csum_root_level(root_backup,
1996 btrfs_header_level(info->csum_root->node));
1998 btrfs_set_backup_total_bytes(root_backup,
1999 btrfs_super_total_bytes(info->super_copy));
2000 btrfs_set_backup_bytes_used(root_backup,
2001 btrfs_super_bytes_used(info->super_copy));
2002 btrfs_set_backup_num_devices(root_backup,
2003 btrfs_super_num_devices(info->super_copy));
2006 * if we don't copy this out to the super_copy, it won't get remembered
2007 * for the next commit
2009 memcpy(&info->super_copy->super_roots,
2010 &info->super_for_commit->super_roots,
2011 sizeof(*root_backup) * BTRFS_NUM_BACKUP_ROOTS);
2015 * this copies info out of the root backup array and back into
2016 * the in-memory super block. It is meant to help iterate through
2017 * the array, so you send it the number of backups you've already
2018 * tried and the last backup index you used.
2020 * this returns -1 when it has tried all the backups
2022 static noinline int next_root_backup(struct btrfs_fs_info *info,
2023 struct btrfs_super_block *super,
2024 int *num_backups_tried, int *backup_index)
2026 struct btrfs_root_backup *root_backup;
2027 int newest = *backup_index;
2029 if (*num_backups_tried == 0) {
2030 u64 gen = btrfs_super_generation(super);
2032 newest = find_newest_super_backup(info, gen);
2036 *backup_index = newest;
2037 *num_backups_tried = 1;
2038 } else if (*num_backups_tried == BTRFS_NUM_BACKUP_ROOTS) {
2039 /* we've tried all the backups, all done */
2042 /* jump to the next oldest backup */
2043 newest = (*backup_index + BTRFS_NUM_BACKUP_ROOTS - 1) %
2044 BTRFS_NUM_BACKUP_ROOTS;
2045 *backup_index = newest;
2046 *num_backups_tried += 1;
2048 root_backup = super->super_roots + newest;
2050 btrfs_set_super_generation(super,
2051 btrfs_backup_tree_root_gen(root_backup));
2052 btrfs_set_super_root(super, btrfs_backup_tree_root(root_backup));
2053 btrfs_set_super_root_level(super,
2054 btrfs_backup_tree_root_level(root_backup));
2055 btrfs_set_super_bytes_used(super, btrfs_backup_bytes_used(root_backup));
2058 * fixme: the total bytes and num_devices need to match or we should
2061 btrfs_set_super_total_bytes(super, btrfs_backup_total_bytes(root_backup));
2062 btrfs_set_super_num_devices(super, btrfs_backup_num_devices(root_backup));
2066 /* helper to cleanup workers */
2067 static void btrfs_stop_all_workers(struct btrfs_fs_info *fs_info)
2069 btrfs_destroy_workqueue(fs_info->fixup_workers);
2070 btrfs_destroy_workqueue(fs_info->delalloc_workers);
2071 btrfs_destroy_workqueue(fs_info->workers);
2072 btrfs_destroy_workqueue(fs_info->endio_workers);
2073 btrfs_destroy_workqueue(fs_info->endio_meta_workers);
2074 btrfs_destroy_workqueue(fs_info->endio_raid56_workers);
2075 btrfs_destroy_workqueue(fs_info->endio_repair_workers);
2076 btrfs_destroy_workqueue(fs_info->rmw_workers);
2077 btrfs_destroy_workqueue(fs_info->endio_meta_write_workers);
2078 btrfs_destroy_workqueue(fs_info->endio_write_workers);
2079 btrfs_destroy_workqueue(fs_info->endio_freespace_worker);
2080 btrfs_destroy_workqueue(fs_info->submit_workers);
2081 btrfs_destroy_workqueue(fs_info->delayed_workers);
2082 btrfs_destroy_workqueue(fs_info->caching_workers);
2083 btrfs_destroy_workqueue(fs_info->readahead_workers);
2084 btrfs_destroy_workqueue(fs_info->flush_workers);
2085 btrfs_destroy_workqueue(fs_info->qgroup_rescan_workers);
2086 btrfs_destroy_workqueue(fs_info->extent_workers);
2089 static void free_root_extent_buffers(struct btrfs_root *root)
2092 free_extent_buffer(root->node);
2093 free_extent_buffer(root->commit_root);
2095 root->commit_root = NULL;
2099 /* helper to cleanup tree roots */
2100 static void free_root_pointers(struct btrfs_fs_info *info, int chunk_root)
2102 free_root_extent_buffers(info->tree_root);
2104 free_root_extent_buffers(info->dev_root);
2105 free_root_extent_buffers(info->extent_root);
2106 free_root_extent_buffers(info->csum_root);
2107 free_root_extent_buffers(info->quota_root);
2108 free_root_extent_buffers(info->uuid_root);
2110 free_root_extent_buffers(info->chunk_root);
2113 void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info)
2116 struct btrfs_root *gang[8];
2119 while (!list_empty(&fs_info->dead_roots)) {
2120 gang[0] = list_entry(fs_info->dead_roots.next,
2121 struct btrfs_root, root_list);
2122 list_del(&gang[0]->root_list);
2124 if (test_bit(BTRFS_ROOT_IN_RADIX, &gang[0]->state)) {
2125 btrfs_drop_and_free_fs_root(fs_info, gang[0]);
2127 free_extent_buffer(gang[0]->node);
2128 free_extent_buffer(gang[0]->commit_root);
2129 btrfs_put_fs_root(gang[0]);
2134 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
2139 for (i = 0; i < ret; i++)
2140 btrfs_drop_and_free_fs_root(fs_info, gang[i]);
2143 if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) {
2144 btrfs_free_log_root_tree(NULL, fs_info);
2145 btrfs_destroy_pinned_extent(fs_info->tree_root,
2146 fs_info->pinned_extents);
2150 int open_ctree(struct super_block *sb,
2151 struct btrfs_fs_devices *fs_devices,
2160 struct btrfs_key location;
2161 struct buffer_head *bh;
2162 struct btrfs_super_block *disk_super;
2163 struct btrfs_fs_info *fs_info = btrfs_sb(sb);
2164 struct btrfs_root *tree_root;
2165 struct btrfs_root *extent_root;
2166 struct btrfs_root *csum_root;
2167 struct btrfs_root *chunk_root;
2168 struct btrfs_root *dev_root;
2169 struct btrfs_root *quota_root;
2170 struct btrfs_root *uuid_root;
2171 struct btrfs_root *log_tree_root;
2174 int num_backups_tried = 0;
2175 int backup_index = 0;
2177 int flags = WQ_MEM_RECLAIM | WQ_FREEZABLE | WQ_UNBOUND;
2178 bool create_uuid_tree;
2179 bool check_uuid_tree;
2181 tree_root = fs_info->tree_root = btrfs_alloc_root(fs_info);
2182 chunk_root = fs_info->chunk_root = btrfs_alloc_root(fs_info);
2183 if (!tree_root || !chunk_root) {
2188 ret = init_srcu_struct(&fs_info->subvol_srcu);
2194 ret = setup_bdi(fs_info, &fs_info->bdi);
2200 ret = percpu_counter_init(&fs_info->dirty_metadata_bytes, 0);
2205 fs_info->dirty_metadata_batch = PAGE_CACHE_SIZE *
2206 (1 + ilog2(nr_cpu_ids));
2208 ret = percpu_counter_init(&fs_info->delalloc_bytes, 0);
2211 goto fail_dirty_metadata_bytes;
2214 ret = percpu_counter_init(&fs_info->bio_counter, 0);
2217 goto fail_delalloc_bytes;
2220 fs_info->btree_inode = new_inode(sb);
2221 if (!fs_info->btree_inode) {
2223 goto fail_bio_counter;
2226 mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
2228 INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC);
2229 INIT_RADIX_TREE(&fs_info->buffer_radix, GFP_ATOMIC);
2230 INIT_LIST_HEAD(&fs_info->trans_list);
2231 INIT_LIST_HEAD(&fs_info->dead_roots);
2232 INIT_LIST_HEAD(&fs_info->delayed_iputs);
2233 INIT_LIST_HEAD(&fs_info->delalloc_roots);
2234 INIT_LIST_HEAD(&fs_info->caching_block_groups);
2235 spin_lock_init(&fs_info->delalloc_root_lock);
2236 spin_lock_init(&fs_info->trans_lock);
2237 spin_lock_init(&fs_info->fs_roots_radix_lock);
2238 spin_lock_init(&fs_info->delayed_iput_lock);
2239 spin_lock_init(&fs_info->defrag_inodes_lock);
2240 spin_lock_init(&fs_info->free_chunk_lock);
2241 spin_lock_init(&fs_info->tree_mod_seq_lock);
2242 spin_lock_init(&fs_info->super_lock);
2243 spin_lock_init(&fs_info->qgroup_op_lock);
2244 spin_lock_init(&fs_info->buffer_lock);
2245 spin_lock_init(&fs_info->unused_bgs_lock);
2246 rwlock_init(&fs_info->tree_mod_log_lock);
2247 mutex_init(&fs_info->reloc_mutex);
2248 mutex_init(&fs_info->delalloc_root_mutex);
2249 seqlock_init(&fs_info->profiles_lock);
2251 init_completion(&fs_info->kobj_unregister);
2252 INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
2253 INIT_LIST_HEAD(&fs_info->space_info);
2254 INIT_LIST_HEAD(&fs_info->tree_mod_seq_list);
2255 INIT_LIST_HEAD(&fs_info->unused_bgs);
2256 btrfs_mapping_init(&fs_info->mapping_tree);
2257 btrfs_init_block_rsv(&fs_info->global_block_rsv,
2258 BTRFS_BLOCK_RSV_GLOBAL);
2259 btrfs_init_block_rsv(&fs_info->delalloc_block_rsv,
2260 BTRFS_BLOCK_RSV_DELALLOC);
2261 btrfs_init_block_rsv(&fs_info->trans_block_rsv, BTRFS_BLOCK_RSV_TRANS);
2262 btrfs_init_block_rsv(&fs_info->chunk_block_rsv, BTRFS_BLOCK_RSV_CHUNK);
2263 btrfs_init_block_rsv(&fs_info->empty_block_rsv, BTRFS_BLOCK_RSV_EMPTY);
2264 btrfs_init_block_rsv(&fs_info->delayed_block_rsv,
2265 BTRFS_BLOCK_RSV_DELOPS);
2266 atomic_set(&fs_info->nr_async_submits, 0);
2267 atomic_set(&fs_info->async_delalloc_pages, 0);
2268 atomic_set(&fs_info->async_submit_draining, 0);
2269 atomic_set(&fs_info->nr_async_bios, 0);
2270 atomic_set(&fs_info->defrag_running, 0);
2271 atomic_set(&fs_info->qgroup_op_seq, 0);
2272 atomic64_set(&fs_info->tree_mod_seq, 0);
2274 fs_info->max_inline = BTRFS_DEFAULT_MAX_INLINE;
2275 fs_info->metadata_ratio = 0;
2276 fs_info->defrag_inodes = RB_ROOT;
2277 fs_info->free_chunk_space = 0;
2278 fs_info->tree_mod_log = RB_ROOT;
2279 fs_info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL;
2280 fs_info->avg_delayed_ref_runtime = div64_u64(NSEC_PER_SEC, 64);
2281 /* readahead state */
2282 INIT_RADIX_TREE(&fs_info->reada_tree, GFP_NOFS & ~__GFP_WAIT);
2283 spin_lock_init(&fs_info->reada_lock);
2285 fs_info->thread_pool_size = min_t(unsigned long,
2286 num_online_cpus() + 2, 8);
2288 INIT_LIST_HEAD(&fs_info->ordered_roots);
2289 spin_lock_init(&fs_info->ordered_root_lock);
2290 fs_info->delayed_root = kmalloc(sizeof(struct btrfs_delayed_root),
2292 if (!fs_info->delayed_root) {
2296 btrfs_init_delayed_root(fs_info->delayed_root);
2298 mutex_init(&fs_info->scrub_lock);
2299 atomic_set(&fs_info->scrubs_running, 0);
2300 atomic_set(&fs_info->scrub_pause_req, 0);
2301 atomic_set(&fs_info->scrubs_paused, 0);
2302 atomic_set(&fs_info->scrub_cancel_req, 0);
2303 init_waitqueue_head(&fs_info->replace_wait);
2304 init_waitqueue_head(&fs_info->scrub_pause_wait);
2305 fs_info->scrub_workers_refcnt = 0;
2306 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
2307 fs_info->check_integrity_print_mask = 0;
2310 spin_lock_init(&fs_info->balance_lock);
2311 mutex_init(&fs_info->balance_mutex);
2312 atomic_set(&fs_info->balance_running, 0);
2313 atomic_set(&fs_info->balance_pause_req, 0);
2314 atomic_set(&fs_info->balance_cancel_req, 0);
2315 fs_info->balance_ctl = NULL;
2316 init_waitqueue_head(&fs_info->balance_wait_q);
2317 btrfs_init_async_reclaim_work(&fs_info->async_reclaim_work);
2319 sb->s_blocksize = 4096;
2320 sb->s_blocksize_bits = blksize_bits(4096);
2321 sb->s_bdi = &fs_info->bdi;
2323 fs_info->btree_inode->i_ino = BTRFS_BTREE_INODE_OBJECTID;
2324 set_nlink(fs_info->btree_inode, 1);
2326 * we set the i_size on the btree inode to the max possible int.
2327 * the real end of the address space is determined by all of
2328 * the devices in the system
2330 fs_info->btree_inode->i_size = OFFSET_MAX;
2331 fs_info->btree_inode->i_mapping->a_ops = &btree_aops;
2332 fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi;
2334 RB_CLEAR_NODE(&BTRFS_I(fs_info->btree_inode)->rb_node);
2335 extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree,
2336 fs_info->btree_inode->i_mapping);
2337 BTRFS_I(fs_info->btree_inode)->io_tree.track_uptodate = 0;
2338 extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree);
2340 BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops;
2342 BTRFS_I(fs_info->btree_inode)->root = tree_root;
2343 memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
2344 sizeof(struct btrfs_key));
2345 set_bit(BTRFS_INODE_DUMMY,
2346 &BTRFS_I(fs_info->btree_inode)->runtime_flags);
2347 btrfs_insert_inode_hash(fs_info->btree_inode);
2349 spin_lock_init(&fs_info->block_group_cache_lock);
2350 fs_info->block_group_cache_tree = RB_ROOT;
2351 fs_info->first_logical_byte = (u64)-1;
2353 extent_io_tree_init(&fs_info->freed_extents[0],
2354 fs_info->btree_inode->i_mapping);
2355 extent_io_tree_init(&fs_info->freed_extents[1],
2356 fs_info->btree_inode->i_mapping);
2357 fs_info->pinned_extents = &fs_info->freed_extents[0];
2358 fs_info->do_barriers = 1;
2361 mutex_init(&fs_info->ordered_operations_mutex);
2362 mutex_init(&fs_info->ordered_extent_flush_mutex);
2363 mutex_init(&fs_info->tree_log_mutex);
2364 mutex_init(&fs_info->chunk_mutex);
2365 mutex_init(&fs_info->transaction_kthread_mutex);
2366 mutex_init(&fs_info->cleaner_mutex);
2367 mutex_init(&fs_info->volume_mutex);
2368 init_rwsem(&fs_info->commit_root_sem);
2369 init_rwsem(&fs_info->cleanup_work_sem);
2370 init_rwsem(&fs_info->subvol_sem);
2371 sema_init(&fs_info->uuid_tree_rescan_sem, 1);
2372 fs_info->dev_replace.lock_owner = 0;
2373 atomic_set(&fs_info->dev_replace.nesting_level, 0);
2374 mutex_init(&fs_info->dev_replace.lock_finishing_cancel_unmount);
2375 mutex_init(&fs_info->dev_replace.lock_management_lock);
2376 mutex_init(&fs_info->dev_replace.lock);
2378 spin_lock_init(&fs_info->qgroup_lock);
2379 mutex_init(&fs_info->qgroup_ioctl_lock);
2380 fs_info->qgroup_tree = RB_ROOT;
2381 fs_info->qgroup_op_tree = RB_ROOT;
2382 INIT_LIST_HEAD(&fs_info->dirty_qgroups);
2383 fs_info->qgroup_seq = 1;
2384 fs_info->quota_enabled = 0;
2385 fs_info->pending_quota_state = 0;
2386 fs_info->qgroup_ulist = NULL;
2387 mutex_init(&fs_info->qgroup_rescan_lock);
2389 btrfs_init_free_cluster(&fs_info->meta_alloc_cluster);
2390 btrfs_init_free_cluster(&fs_info->data_alloc_cluster);
2392 init_waitqueue_head(&fs_info->transaction_throttle);
2393 init_waitqueue_head(&fs_info->transaction_wait);
2394 init_waitqueue_head(&fs_info->transaction_blocked_wait);
2395 init_waitqueue_head(&fs_info->async_submit_wait);
2397 ret = btrfs_alloc_stripe_hash_table(fs_info);
2403 __setup_root(4096, 4096, 4096, tree_root,
2404 fs_info, BTRFS_ROOT_TREE_OBJECTID);
2406 invalidate_bdev(fs_devices->latest_bdev);
2409 * Read super block and check the signature bytes only
2411 bh = btrfs_read_dev_super(fs_devices->latest_bdev);
2418 * We want to check superblock checksum, the type is stored inside.
2419 * Pass the whole disk block of size BTRFS_SUPER_INFO_SIZE (4k).
2421 if (btrfs_check_super_csum(bh->b_data)) {
2422 printk(KERN_ERR "BTRFS: superblock checksum mismatch\n");
2428 * super_copy is zeroed at allocation time and we never touch the
2429 * following bytes up to INFO_SIZE, the checksum is calculated from
2430 * the whole block of INFO_SIZE
2432 memcpy(fs_info->super_copy, bh->b_data, sizeof(*fs_info->super_copy));
2433 memcpy(fs_info->super_for_commit, fs_info->super_copy,
2434 sizeof(*fs_info->super_for_commit));
2437 memcpy(fs_info->fsid, fs_info->super_copy->fsid, BTRFS_FSID_SIZE);
2439 ret = btrfs_check_super_valid(fs_info, sb->s_flags & MS_RDONLY);
2441 printk(KERN_ERR "BTRFS: superblock contains fatal errors\n");
2446 disk_super = fs_info->super_copy;
2447 if (!btrfs_super_root(disk_super))
2450 /* check FS state, whether FS is broken. */
2451 if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_ERROR)
2452 set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state);
2455 * run through our array of backup supers and setup
2456 * our ring pointer to the oldest one
2458 generation = btrfs_super_generation(disk_super);
2459 find_oldest_super_backup(fs_info, generation);
2462 * In the long term, we'll store the compression type in the super
2463 * block, and it'll be used for per file compression control.
2465 fs_info->compress_type = BTRFS_COMPRESS_ZLIB;
2467 ret = btrfs_parse_options(tree_root, options);
2473 features = btrfs_super_incompat_flags(disk_super) &
2474 ~BTRFS_FEATURE_INCOMPAT_SUPP;
2476 printk(KERN_ERR "BTRFS: couldn't mount because of "
2477 "unsupported optional features (%Lx).\n",
2484 * Leafsize and nodesize were always equal, this is only a sanity check.
2486 if (le32_to_cpu(disk_super->__unused_leafsize) !=
2487 btrfs_super_nodesize(disk_super)) {
2488 printk(KERN_ERR "BTRFS: couldn't mount because metadata "
2489 "blocksizes don't match. node %d leaf %d\n",
2490 btrfs_super_nodesize(disk_super),
2491 le32_to_cpu(disk_super->__unused_leafsize));
2495 if (btrfs_super_nodesize(disk_super) > BTRFS_MAX_METADATA_BLOCKSIZE) {
2496 printk(KERN_ERR "BTRFS: couldn't mount because metadata "
2497 "blocksize (%d) was too large\n",
2498 btrfs_super_nodesize(disk_super));
2503 features = btrfs_super_incompat_flags(disk_super);
2504 features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
2505 if (tree_root->fs_info->compress_type == BTRFS_COMPRESS_LZO)
2506 features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO;
2508 if (features & BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA)
2509 printk(KERN_ERR "BTRFS: has skinny extents\n");
2512 * flag our filesystem as having big metadata blocks if
2513 * they are bigger than the page size
2515 if (btrfs_super_nodesize(disk_super) > PAGE_CACHE_SIZE) {
2516 if (!(features & BTRFS_FEATURE_INCOMPAT_BIG_METADATA))
2517 printk(KERN_INFO "BTRFS: flagging fs with big metadata feature\n");
2518 features |= BTRFS_FEATURE_INCOMPAT_BIG_METADATA;
2521 nodesize = btrfs_super_nodesize(disk_super);
2522 sectorsize = btrfs_super_sectorsize(disk_super);
2523 stripesize = btrfs_super_stripesize(disk_super);
2524 fs_info->dirty_metadata_batch = nodesize * (1 + ilog2(nr_cpu_ids));
2525 fs_info->delalloc_batch = sectorsize * 512 * (1 + ilog2(nr_cpu_ids));
2528 * mixed block groups end up with duplicate but slightly offset
2529 * extent buffers for the same range. It leads to corruptions
2531 if ((features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) &&
2532 (sectorsize != nodesize)) {
2533 printk(KERN_WARNING "BTRFS: unequal leaf/node/sector sizes "
2534 "are not allowed for mixed block groups on %s\n",
2540 * Needn't use the lock because there is no other task which will
2543 btrfs_set_super_incompat_flags(disk_super, features);
2545 features = btrfs_super_compat_ro_flags(disk_super) &
2546 ~BTRFS_FEATURE_COMPAT_RO_SUPP;
2547 if (!(sb->s_flags & MS_RDONLY) && features) {
2548 printk(KERN_ERR "BTRFS: couldn't mount RDWR because of "
2549 "unsupported option features (%Lx).\n",
2555 max_active = fs_info->thread_pool_size;
2558 btrfs_alloc_workqueue("worker", flags | WQ_HIGHPRI,
2561 fs_info->delalloc_workers =
2562 btrfs_alloc_workqueue("delalloc", flags, max_active, 2);
2564 fs_info->flush_workers =
2565 btrfs_alloc_workqueue("flush_delalloc", flags, max_active, 0);
2567 fs_info->caching_workers =
2568 btrfs_alloc_workqueue("cache", flags, max_active, 0);
2571 * a higher idle thresh on the submit workers makes it much more
2572 * likely that bios will be send down in a sane order to the
2575 fs_info->submit_workers =
2576 btrfs_alloc_workqueue("submit", flags,
2577 min_t(u64, fs_devices->num_devices,
2580 fs_info->fixup_workers =
2581 btrfs_alloc_workqueue("fixup", flags, 1, 0);
2584 * endios are largely parallel and should have a very
2587 fs_info->endio_workers =
2588 btrfs_alloc_workqueue("endio", flags, max_active, 4);
2589 fs_info->endio_meta_workers =
2590 btrfs_alloc_workqueue("endio-meta", flags, max_active, 4);
2591 fs_info->endio_meta_write_workers =
2592 btrfs_alloc_workqueue("endio-meta-write", flags, max_active, 2);
2593 fs_info->endio_raid56_workers =
2594 btrfs_alloc_workqueue("endio-raid56", flags, max_active, 4);
2595 fs_info->endio_repair_workers =
2596 btrfs_alloc_workqueue("endio-repair", flags, 1, 0);
2597 fs_info->rmw_workers =
2598 btrfs_alloc_workqueue("rmw", flags, max_active, 2);
2599 fs_info->endio_write_workers =
2600 btrfs_alloc_workqueue("endio-write", flags, max_active, 2);
2601 fs_info->endio_freespace_worker =
2602 btrfs_alloc_workqueue("freespace-write", flags, max_active, 0);
2603 fs_info->delayed_workers =
2604 btrfs_alloc_workqueue("delayed-meta", flags, max_active, 0);
2605 fs_info->readahead_workers =
2606 btrfs_alloc_workqueue("readahead", flags, max_active, 2);
2607 fs_info->qgroup_rescan_workers =
2608 btrfs_alloc_workqueue("qgroup-rescan", flags, 1, 0);
2609 fs_info->extent_workers =
2610 btrfs_alloc_workqueue("extent-refs", flags,
2611 min_t(u64, fs_devices->num_devices,
2614 if (!(fs_info->workers && fs_info->delalloc_workers &&
2615 fs_info->submit_workers && fs_info->flush_workers &&
2616 fs_info->endio_workers && fs_info->endio_meta_workers &&
2617 fs_info->endio_meta_write_workers &&
2618 fs_info->endio_repair_workers &&
2619 fs_info->endio_write_workers && fs_info->endio_raid56_workers &&
2620 fs_info->endio_freespace_worker && fs_info->rmw_workers &&
2621 fs_info->caching_workers && fs_info->readahead_workers &&
2622 fs_info->fixup_workers && fs_info->delayed_workers &&
2623 fs_info->extent_workers &&
2624 fs_info->qgroup_rescan_workers)) {
2626 goto fail_sb_buffer;
2629 fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super);
2630 fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages,
2631 4 * 1024 * 1024 / PAGE_CACHE_SIZE);
2633 tree_root->nodesize = nodesize;
2634 tree_root->sectorsize = sectorsize;
2635 tree_root->stripesize = stripesize;
2637 sb->s_blocksize = sectorsize;
2638 sb->s_blocksize_bits = blksize_bits(sectorsize);
2640 if (btrfs_super_magic(disk_super) != BTRFS_MAGIC) {
2641 printk(KERN_INFO "BTRFS: valid FS not found on %s\n", sb->s_id);
2642 goto fail_sb_buffer;
2645 if (sectorsize != PAGE_SIZE) {
2646 printk(KERN_WARNING "BTRFS: Incompatible sector size(%lu) "
2647 "found on %s\n", (unsigned long)sectorsize, sb->s_id);
2648 goto fail_sb_buffer;
2651 mutex_lock(&fs_info->chunk_mutex);
2652 ret = btrfs_read_sys_array(tree_root);
2653 mutex_unlock(&fs_info->chunk_mutex);
2655 printk(KERN_WARNING "BTRFS: failed to read the system "
2656 "array on %s\n", sb->s_id);
2657 goto fail_sb_buffer;
2660 blocksize = tree_root->nodesize;
2661 generation = btrfs_super_chunk_root_generation(disk_super);
2663 __setup_root(nodesize, sectorsize, stripesize, chunk_root,
2664 fs_info, BTRFS_CHUNK_TREE_OBJECTID);
2666 chunk_root->node = read_tree_block(chunk_root,
2667 btrfs_super_chunk_root(disk_super),
2668 blocksize, generation);
2669 if (!chunk_root->node ||
2670 !test_bit(EXTENT_BUFFER_UPTODATE, &chunk_root->node->bflags)) {
2671 printk(KERN_WARNING "BTRFS: failed to read chunk root on %s\n",
2673 goto fail_tree_roots;
2675 btrfs_set_root_node(&chunk_root->root_item, chunk_root->node);
2676 chunk_root->commit_root = btrfs_root_node(chunk_root);
2678 read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
2679 btrfs_header_chunk_tree_uuid(chunk_root->node), BTRFS_UUID_SIZE);
2681 ret = btrfs_read_chunk_tree(chunk_root);
2683 printk(KERN_WARNING "BTRFS: failed to read chunk tree on %s\n",
2685 goto fail_tree_roots;
2689 * keep the device that is marked to be the target device for the
2690 * dev_replace procedure
2692 btrfs_close_extra_devices(fs_info, fs_devices, 0);
2694 if (!fs_devices->latest_bdev) {
2695 printk(KERN_CRIT "BTRFS: failed to read devices on %s\n",
2697 goto fail_tree_roots;
2701 blocksize = tree_root->nodesize;
2702 generation = btrfs_super_generation(disk_super);
2704 tree_root->node = read_tree_block(tree_root,
2705 btrfs_super_root(disk_super),
2706 blocksize, generation);
2707 if (!tree_root->node ||
2708 !test_bit(EXTENT_BUFFER_UPTODATE, &tree_root->node->bflags)) {
2709 printk(KERN_WARNING "BTRFS: failed to read tree root on %s\n",
2712 goto recovery_tree_root;
2715 btrfs_set_root_node(&tree_root->root_item, tree_root->node);
2716 tree_root->commit_root = btrfs_root_node(tree_root);
2717 btrfs_set_root_refs(&tree_root->root_item, 1);
2719 location.objectid = BTRFS_EXTENT_TREE_OBJECTID;
2720 location.type = BTRFS_ROOT_ITEM_KEY;
2721 location.offset = 0;
2723 extent_root = btrfs_read_tree_root(tree_root, &location);
2724 if (IS_ERR(extent_root)) {
2725 ret = PTR_ERR(extent_root);
2726 goto recovery_tree_root;
2728 set_bit(BTRFS_ROOT_TRACK_DIRTY, &extent_root->state);
2729 fs_info->extent_root = extent_root;
2731 location.objectid = BTRFS_DEV_TREE_OBJECTID;
2732 dev_root = btrfs_read_tree_root(tree_root, &location);
2733 if (IS_ERR(dev_root)) {
2734 ret = PTR_ERR(dev_root);
2735 goto recovery_tree_root;
2737 set_bit(BTRFS_ROOT_TRACK_DIRTY, &dev_root->state);
2738 fs_info->dev_root = dev_root;
2739 btrfs_init_devices_late(fs_info);
2741 location.objectid = BTRFS_CSUM_TREE_OBJECTID;
2742 csum_root = btrfs_read_tree_root(tree_root, &location);
2743 if (IS_ERR(csum_root)) {
2744 ret = PTR_ERR(csum_root);
2745 goto recovery_tree_root;
2747 set_bit(BTRFS_ROOT_TRACK_DIRTY, &csum_root->state);
2748 fs_info->csum_root = csum_root;
2750 location.objectid = BTRFS_QUOTA_TREE_OBJECTID;
2751 quota_root = btrfs_read_tree_root(tree_root, &location);
2752 if (!IS_ERR(quota_root)) {
2753 set_bit(BTRFS_ROOT_TRACK_DIRTY, "a_root->state);
2754 fs_info->quota_enabled = 1;
2755 fs_info->pending_quota_state = 1;
2756 fs_info->quota_root = quota_root;
2759 location.objectid = BTRFS_UUID_TREE_OBJECTID;
2760 uuid_root = btrfs_read_tree_root(tree_root, &location);
2761 if (IS_ERR(uuid_root)) {
2762 ret = PTR_ERR(uuid_root);
2764 goto recovery_tree_root;
2765 create_uuid_tree = true;
2766 check_uuid_tree = false;
2768 set_bit(BTRFS_ROOT_TRACK_DIRTY, &uuid_root->state);
2769 fs_info->uuid_root = uuid_root;
2770 create_uuid_tree = false;
2772 generation != btrfs_super_uuid_tree_generation(disk_super);
2775 fs_info->generation = generation;
2776 fs_info->last_trans_committed = generation;
2778 ret = btrfs_recover_balance(fs_info);
2780 printk(KERN_WARNING "BTRFS: failed to recover balance\n");
2781 goto fail_block_groups;
2784 ret = btrfs_init_dev_stats(fs_info);
2786 printk(KERN_ERR "BTRFS: failed to init dev_stats: %d\n",
2788 goto fail_block_groups;
2791 ret = btrfs_init_dev_replace(fs_info);
2793 pr_err("BTRFS: failed to init dev_replace: %d\n", ret);
2794 goto fail_block_groups;
2797 btrfs_close_extra_devices(fs_info, fs_devices, 1);
2799 ret = btrfs_sysfs_add_one(fs_info);
2801 pr_err("BTRFS: failed to init sysfs interface: %d\n", ret);
2802 goto fail_block_groups;
2805 ret = btrfs_init_space_info(fs_info);
2807 printk(KERN_ERR "BTRFS: Failed to initial space info: %d\n", ret);
2811 ret = btrfs_read_block_groups(extent_root);
2813 printk(KERN_ERR "BTRFS: Failed to read block groups: %d\n", ret);
2816 fs_info->num_tolerated_disk_barrier_failures =
2817 btrfs_calc_num_tolerated_disk_barrier_failures(fs_info);
2818 if (fs_info->fs_devices->missing_devices >
2819 fs_info->num_tolerated_disk_barrier_failures &&
2820 !(sb->s_flags & MS_RDONLY)) {
2821 printk(KERN_WARNING "BTRFS: "
2822 "too many missing devices, writeable mount is not allowed\n");
2826 fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root,
2828 if (IS_ERR(fs_info->cleaner_kthread))
2831 fs_info->transaction_kthread = kthread_run(transaction_kthread,
2833 "btrfs-transaction");
2834 if (IS_ERR(fs_info->transaction_kthread))
2837 if (!btrfs_test_opt(tree_root, SSD) &&
2838 !btrfs_test_opt(tree_root, NOSSD) &&
2839 !fs_info->fs_devices->rotating) {
2840 printk(KERN_INFO "BTRFS: detected SSD devices, enabling SSD "
2842 btrfs_set_opt(fs_info->mount_opt, SSD);
2845 /* Set the real inode map cache flag */
2846 if (btrfs_test_opt(tree_root, CHANGE_INODE_CACHE))
2847 btrfs_set_opt(tree_root->fs_info->mount_opt, INODE_MAP_CACHE);
2849 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
2850 if (btrfs_test_opt(tree_root, CHECK_INTEGRITY)) {
2851 ret = btrfsic_mount(tree_root, fs_devices,
2852 btrfs_test_opt(tree_root,
2853 CHECK_INTEGRITY_INCLUDING_EXTENT_DATA) ?
2855 fs_info->check_integrity_print_mask);
2857 printk(KERN_WARNING "BTRFS: failed to initialize"
2858 " integrity check module %s\n", sb->s_id);
2861 ret = btrfs_read_qgroup_config(fs_info);
2863 goto fail_trans_kthread;
2865 /* do not make disk changes in broken FS */
2866 if (btrfs_super_log_root(disk_super) != 0) {
2867 u64 bytenr = btrfs_super_log_root(disk_super);
2869 if (fs_devices->rw_devices == 0) {
2870 printk(KERN_WARNING "BTRFS: log replay required "
2875 blocksize = tree_root->nodesize;
2877 log_tree_root = btrfs_alloc_root(fs_info);
2878 if (!log_tree_root) {
2883 __setup_root(nodesize, sectorsize, stripesize,
2884 log_tree_root, fs_info, BTRFS_TREE_LOG_OBJECTID);
2886 log_tree_root->node = read_tree_block(tree_root, bytenr,
2889 if (!log_tree_root->node ||
2890 !extent_buffer_uptodate(log_tree_root->node)) {
2891 printk(KERN_ERR "BTRFS: failed to read log tree\n");
2892 free_extent_buffer(log_tree_root->node);
2893 kfree(log_tree_root);
2896 /* returns with log_tree_root freed on success */
2897 ret = btrfs_recover_log_trees(log_tree_root);
2899 btrfs_error(tree_root->fs_info, ret,
2900 "Failed to recover log tree");
2901 free_extent_buffer(log_tree_root->node);
2902 kfree(log_tree_root);
2906 if (sb->s_flags & MS_RDONLY) {
2907 ret = btrfs_commit_super(tree_root);
2913 ret = btrfs_find_orphan_roots(tree_root);
2917 if (!(sb->s_flags & MS_RDONLY)) {
2918 ret = btrfs_cleanup_fs_roots(fs_info);
2922 mutex_lock(&fs_info->cleaner_mutex);
2923 ret = btrfs_recover_relocation(tree_root);
2924 mutex_unlock(&fs_info->cleaner_mutex);
2927 "BTRFS: failed to recover relocation\n");
2933 location.objectid = BTRFS_FS_TREE_OBJECTID;
2934 location.type = BTRFS_ROOT_ITEM_KEY;
2935 location.offset = 0;
2937 fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location);
2938 if (IS_ERR(fs_info->fs_root)) {
2939 err = PTR_ERR(fs_info->fs_root);
2943 if (sb->s_flags & MS_RDONLY)
2946 down_read(&fs_info->cleanup_work_sem);
2947 if ((ret = btrfs_orphan_cleanup(fs_info->fs_root)) ||
2948 (ret = btrfs_orphan_cleanup(fs_info->tree_root))) {
2949 up_read(&fs_info->cleanup_work_sem);
2950 close_ctree(tree_root);
2953 up_read(&fs_info->cleanup_work_sem);
2955 ret = btrfs_resume_balance_async(fs_info);
2957 printk(KERN_WARNING "BTRFS: failed to resume balance\n");
2958 close_ctree(tree_root);
2962 ret = btrfs_resume_dev_replace_async(fs_info);
2964 pr_warn("BTRFS: failed to resume dev_replace\n");
2965 close_ctree(tree_root);
2969 btrfs_qgroup_rescan_resume(fs_info);
2971 if (create_uuid_tree) {
2972 pr_info("BTRFS: creating UUID tree\n");
2973 ret = btrfs_create_uuid_tree(fs_info);
2975 pr_warn("BTRFS: failed to create the UUID tree %d\n",
2977 close_ctree(tree_root);
2980 } else if (check_uuid_tree ||
2981 btrfs_test_opt(tree_root, RESCAN_UUID_TREE)) {
2982 pr_info("BTRFS: checking UUID tree\n");
2983 ret = btrfs_check_uuid_tree(fs_info);
2985 pr_warn("BTRFS: failed to check the UUID tree %d\n",
2987 close_ctree(tree_root);
2991 fs_info->update_uuid_tree_gen = 1;
2999 btrfs_free_qgroup_config(fs_info);
3001 kthread_stop(fs_info->transaction_kthread);
3002 btrfs_cleanup_transaction(fs_info->tree_root);
3003 btrfs_free_fs_roots(fs_info);
3005 kthread_stop(fs_info->cleaner_kthread);
3008 * make sure we're done with the btree inode before we stop our
3011 filemap_write_and_wait(fs_info->btree_inode->i_mapping);
3014 btrfs_sysfs_remove_one(fs_info);
3017 btrfs_put_block_group_cache(fs_info);
3018 btrfs_free_block_groups(fs_info);
3021 free_root_pointers(fs_info, 1);
3022 invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
3025 btrfs_stop_all_workers(fs_info);
3028 btrfs_mapping_tree_free(&fs_info->mapping_tree);
3030 iput(fs_info->btree_inode);
3032 percpu_counter_destroy(&fs_info->bio_counter);
3033 fail_delalloc_bytes:
3034 percpu_counter_destroy(&fs_info->delalloc_bytes);
3035 fail_dirty_metadata_bytes:
3036 percpu_counter_destroy(&fs_info->dirty_metadata_bytes);
3038 bdi_destroy(&fs_info->bdi);
3040 cleanup_srcu_struct(&fs_info->subvol_srcu);
3042 btrfs_free_stripe_hash_table(fs_info);
3043 btrfs_close_devices(fs_info->fs_devices);
3047 if (!btrfs_test_opt(tree_root, RECOVERY))
3048 goto fail_tree_roots;
3050 free_root_pointers(fs_info, 0);
3052 /* don't use the log in recovery mode, it won't be valid */
3053 btrfs_set_super_log_root(disk_super, 0);
3055 /* we can't trust the free space cache either */
3056 btrfs_set_opt(fs_info->mount_opt, CLEAR_CACHE);
3058 ret = next_root_backup(fs_info, fs_info->super_copy,
3059 &num_backups_tried, &backup_index);
3061 goto fail_block_groups;
3062 goto retry_root_backup;
3065 static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate)
3068 set_buffer_uptodate(bh);
3070 struct btrfs_device *device = (struct btrfs_device *)
3073 printk_ratelimited_in_rcu(KERN_WARNING "BTRFS: lost page write due to "
3074 "I/O error on %s\n",
3075 rcu_str_deref(device->name));
3076 /* note, we dont' set_buffer_write_io_error because we have
3077 * our own ways of dealing with the IO errors
3079 clear_buffer_uptodate(bh);
3080 btrfs_dev_stat_inc_and_print(device, BTRFS_DEV_STAT_WRITE_ERRS);
3086 struct buffer_head *btrfs_read_dev_super(struct block_device *bdev)
3088 struct buffer_head *bh;
3089 struct buffer_head *latest = NULL;
3090 struct btrfs_super_block *super;
3095 /* we would like to check all the supers, but that would make
3096 * a btrfs mount succeed after a mkfs from a different FS.
3097 * So, we need to add a special mount option to scan for
3098 * later supers, using BTRFS_SUPER_MIRROR_MAX instead
3100 for (i = 0; i < 1; i++) {
3101 bytenr = btrfs_sb_offset(i);
3102 if (bytenr + BTRFS_SUPER_INFO_SIZE >=
3103 i_size_read(bdev->bd_inode))
3105 bh = __bread(bdev, bytenr / 4096,
3106 BTRFS_SUPER_INFO_SIZE);
3110 super = (struct btrfs_super_block *)bh->b_data;
3111 if (btrfs_super_bytenr(super) != bytenr ||
3112 btrfs_super_magic(super) != BTRFS_MAGIC) {
3117 if (!latest || btrfs_super_generation(super) > transid) {
3120 transid = btrfs_super_generation(super);
3129 * this should be called twice, once with wait == 0 and
3130 * once with wait == 1. When wait == 0 is done, all the buffer heads
3131 * we write are pinned.
3133 * They are released when wait == 1 is done.
3134 * max_mirrors must be the same for both runs, and it indicates how
3135 * many supers on this one device should be written.
3137 * max_mirrors == 0 means to write them all.
3139 static int write_dev_supers(struct btrfs_device *device,
3140 struct btrfs_super_block *sb,
3141 int do_barriers, int wait, int max_mirrors)
3143 struct buffer_head *bh;
3150 if (max_mirrors == 0)
3151 max_mirrors = BTRFS_SUPER_MIRROR_MAX;
3153 for (i = 0; i < max_mirrors; i++) {
3154 bytenr = btrfs_sb_offset(i);
3155 if (bytenr + BTRFS_SUPER_INFO_SIZE >=
3156 device->commit_total_bytes)
3160 bh = __find_get_block(device->bdev, bytenr / 4096,
3161 BTRFS_SUPER_INFO_SIZE);
3167 if (!buffer_uptodate(bh))
3170 /* drop our reference */
3173 /* drop the reference from the wait == 0 run */
3177 btrfs_set_super_bytenr(sb, bytenr);
3180 crc = btrfs_csum_data((char *)sb +
3181 BTRFS_CSUM_SIZE, crc,
3182 BTRFS_SUPER_INFO_SIZE -
3184 btrfs_csum_final(crc, sb->csum);
3187 * one reference for us, and we leave it for the
3190 bh = __getblk(device->bdev, bytenr / 4096,
3191 BTRFS_SUPER_INFO_SIZE);
3193 printk(KERN_ERR "BTRFS: couldn't get super "
3194 "buffer head for bytenr %Lu\n", bytenr);
3199 memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE);
3201 /* one reference for submit_bh */
3204 set_buffer_uptodate(bh);
3206 bh->b_end_io = btrfs_end_buffer_write_sync;
3207 bh->b_private = device;
3211 * we fua the first super. The others we allow
3215 ret = btrfsic_submit_bh(WRITE_FUA, bh);
3217 ret = btrfsic_submit_bh(WRITE_SYNC, bh);
3221 return errors < i ? 0 : -1;
3225 * endio for the write_dev_flush, this will wake anyone waiting
3226 * for the barrier when it is done
3228 static void btrfs_end_empty_barrier(struct bio *bio, int err)
3231 if (err == -EOPNOTSUPP)
3232 set_bit(BIO_EOPNOTSUPP, &bio->bi_flags);
3233 clear_bit(BIO_UPTODATE, &bio->bi_flags);
3235 if (bio->bi_private)
3236 complete(bio->bi_private);
3241 * trigger flushes for one the devices. If you pass wait == 0, the flushes are
3242 * sent down. With wait == 1, it waits for the previous flush.
3244 * any device where the flush fails with eopnotsupp are flagged as not-barrier
3247 static int write_dev_flush(struct btrfs_device *device, int wait)
3252 if (device->nobarriers)
3256 bio = device->flush_bio;
3260 wait_for_completion(&device->flush_wait);
3262 if (bio_flagged(bio, BIO_EOPNOTSUPP)) {
3263 printk_in_rcu("BTRFS: disabling barriers on dev %s\n",
3264 rcu_str_deref(device->name));
3265 device->nobarriers = 1;
3266 } else if (!bio_flagged(bio, BIO_UPTODATE)) {
3268 btrfs_dev_stat_inc_and_print(device,
3269 BTRFS_DEV_STAT_FLUSH_ERRS);
3272 /* drop the reference from the wait == 0 run */
3274 device->flush_bio = NULL;
3280 * one reference for us, and we leave it for the
3283 device->flush_bio = NULL;
3284 bio = btrfs_io_bio_alloc(GFP_NOFS, 0);
3288 bio->bi_end_io = btrfs_end_empty_barrier;
3289 bio->bi_bdev = device->bdev;
3290 init_completion(&device->flush_wait);
3291 bio->bi_private = &device->flush_wait;
3292 device->flush_bio = bio;
3295 btrfsic_submit_bio(WRITE_FLUSH, bio);
3301 * send an empty flush down to each device in parallel,
3302 * then wait for them
3304 static int barrier_all_devices(struct btrfs_fs_info *info)
3306 struct list_head *head;
3307 struct btrfs_device *dev;
3308 int errors_send = 0;
3309 int errors_wait = 0;
3312 /* send down all the barriers */
3313 head = &info->fs_devices->devices;
3314 list_for_each_entry_rcu(dev, head, dev_list) {
3321 if (!dev->in_fs_metadata || !dev->writeable)
3324 ret = write_dev_flush(dev, 0);
3329 /* wait for all the barriers */
3330 list_for_each_entry_rcu(dev, head, dev_list) {
3337 if (!dev->in_fs_metadata || !dev->writeable)
3340 ret = write_dev_flush(dev, 1);
3344 if (errors_send > info->num_tolerated_disk_barrier_failures ||
3345 errors_wait > info->num_tolerated_disk_barrier_failures)
3350 int btrfs_calc_num_tolerated_disk_barrier_failures(
3351 struct btrfs_fs_info *fs_info)
3353 struct btrfs_ioctl_space_info space;
3354 struct btrfs_space_info *sinfo;
3355 u64 types[] = {BTRFS_BLOCK_GROUP_DATA,
3356 BTRFS_BLOCK_GROUP_SYSTEM,
3357 BTRFS_BLOCK_GROUP_METADATA,
3358 BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA};
3362 int num_tolerated_disk_barrier_failures =
3363 (int)fs_info->fs_devices->num_devices;
3365 for (i = 0; i < num_types; i++) {
3366 struct btrfs_space_info *tmp;
3370 list_for_each_entry_rcu(tmp, &fs_info->space_info, list) {
3371 if (tmp->flags == types[i]) {
3381 down_read(&sinfo->groups_sem);
3382 for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) {
3383 if (!list_empty(&sinfo->block_groups[c])) {
3386 btrfs_get_block_group_info(
3387 &sinfo->block_groups[c], &space);
3388 if (space.total_bytes == 0 ||
3389 space.used_bytes == 0)
3391 flags = space.flags;
3394 * 0: if dup, single or RAID0 is configured for
3395 * any of metadata, system or data, else
3396 * 1: if RAID5 is configured, or if RAID1 or
3397 * RAID10 is configured and only two mirrors
3399 * 2: if RAID6 is configured, else
3400 * num_mirrors - 1: if RAID1 or RAID10 is
3401 * configured and more than
3402 * 2 mirrors are used.
3404 if (num_tolerated_disk_barrier_failures > 0 &&
3405 ((flags & (BTRFS_BLOCK_GROUP_DUP |
3406 BTRFS_BLOCK_GROUP_RAID0)) ||
3407 ((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK)
3409 num_tolerated_disk_barrier_failures = 0;
3410 else if (num_tolerated_disk_barrier_failures > 1) {
3411 if (flags & (BTRFS_BLOCK_GROUP_RAID1 |
3412 BTRFS_BLOCK_GROUP_RAID5 |
3413 BTRFS_BLOCK_GROUP_RAID10)) {
3414 num_tolerated_disk_barrier_failures = 1;
3416 BTRFS_BLOCK_GROUP_RAID6) {
3417 num_tolerated_disk_barrier_failures = 2;
3422 up_read(&sinfo->groups_sem);
3425 return num_tolerated_disk_barrier_failures;
3428 static int write_all_supers(struct btrfs_root *root, int max_mirrors)
3430 struct list_head *head;
3431 struct btrfs_device *dev;
3432 struct btrfs_super_block *sb;
3433 struct btrfs_dev_item *dev_item;
3437 int total_errors = 0;
3440 do_barriers = !btrfs_test_opt(root, NOBARRIER);
3441 backup_super_roots(root->fs_info);
3443 sb = root->fs_info->super_for_commit;
3444 dev_item = &sb->dev_item;
3446 mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
3447 head = &root->fs_info->fs_devices->devices;
3448 max_errors = btrfs_super_num_devices(root->fs_info->super_copy) - 1;
3451 ret = barrier_all_devices(root->fs_info);
3454 &root->fs_info->fs_devices->device_list_mutex);
3455 btrfs_error(root->fs_info, ret,
3456 "errors while submitting device barriers.");
3461 list_for_each_entry_rcu(dev, head, dev_list) {
3466 if (!dev->in_fs_metadata || !dev->writeable)
3469 btrfs_set_stack_device_generation(dev_item, 0);
3470 btrfs_set_stack_device_type(dev_item, dev->type);
3471 btrfs_set_stack_device_id(dev_item, dev->devid);
3472 btrfs_set_stack_device_total_bytes(dev_item,
3473 dev->commit_total_bytes);
3474 btrfs_set_stack_device_bytes_used(dev_item,
3475 dev->commit_bytes_used);
3476 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
3477 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
3478 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
3479 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
3480 memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
3482 flags = btrfs_super_flags(sb);
3483 btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
3485 ret = write_dev_supers(dev, sb, do_barriers, 0, max_mirrors);
3489 if (total_errors > max_errors) {
3490 btrfs_err(root->fs_info, "%d errors while writing supers",
3492 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
3494 /* FUA is masked off if unsupported and can't be the reason */
3495 btrfs_error(root->fs_info, -EIO,
3496 "%d errors while writing supers", total_errors);
3501 list_for_each_entry_rcu(dev, head, dev_list) {
3504 if (!dev->in_fs_metadata || !dev->writeable)
3507 ret = write_dev_supers(dev, sb, do_barriers, 1, max_mirrors);
3511 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
3512 if (total_errors > max_errors) {
3513 btrfs_error(root->fs_info, -EIO,
3514 "%d errors while writing supers", total_errors);
3520 int write_ctree_super(struct btrfs_trans_handle *trans,
3521 struct btrfs_root *root, int max_mirrors)
3523 return write_all_supers(root, max_mirrors);
3526 /* Drop a fs root from the radix tree and free it. */
3527 void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,
3528 struct btrfs_root *root)
3530 spin_lock(&fs_info->fs_roots_radix_lock);
3531 radix_tree_delete(&fs_info->fs_roots_radix,
3532 (unsigned long)root->root_key.objectid);
3533 spin_unlock(&fs_info->fs_roots_radix_lock);
3535 if (btrfs_root_refs(&root->root_item) == 0)
3536 synchronize_srcu(&fs_info->subvol_srcu);
3538 if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state))
3539 btrfs_free_log(NULL, root);
3541 if (root->free_ino_pinned)
3542 __btrfs_remove_free_space_cache(root->free_ino_pinned);
3543 if (root->free_ino_ctl)
3544 __btrfs_remove_free_space_cache(root->free_ino_ctl);
3548 static void free_fs_root(struct btrfs_root *root)
3550 iput(root->ino_cache_inode);
3551 WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree));
3552 btrfs_free_block_rsv(root, root->orphan_block_rsv);
3553 root->orphan_block_rsv = NULL;
3555 free_anon_bdev(root->anon_dev);
3556 if (root->subv_writers)
3557 btrfs_free_subvolume_writers(root->subv_writers);
3558 free_extent_buffer(root->node);
3559 free_extent_buffer(root->commit_root);
3560 kfree(root->free_ino_ctl);
3561 kfree(root->free_ino_pinned);
3563 btrfs_put_fs_root(root);
3566 void btrfs_free_fs_root(struct btrfs_root *root)
3571 int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info)
3573 u64 root_objectid = 0;
3574 struct btrfs_root *gang[8];
3577 unsigned int ret = 0;
3581 index = srcu_read_lock(&fs_info->subvol_srcu);
3582 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
3583 (void **)gang, root_objectid,
3586 srcu_read_unlock(&fs_info->subvol_srcu, index);
3589 root_objectid = gang[ret - 1]->root_key.objectid + 1;
3591 for (i = 0; i < ret; i++) {
3592 /* Avoid to grab roots in dead_roots */
3593 if (btrfs_root_refs(&gang[i]->root_item) == 0) {
3597 /* grab all the search result for later use */
3598 gang[i] = btrfs_grab_fs_root(gang[i]);
3600 srcu_read_unlock(&fs_info->subvol_srcu, index);
3602 for (i = 0; i < ret; i++) {
3605 root_objectid = gang[i]->root_key.objectid;
3606 err = btrfs_orphan_cleanup(gang[i]);
3609 btrfs_put_fs_root(gang[i]);
3614 /* release the uncleaned roots due to error */
3615 for (; i < ret; i++) {
3617 btrfs_put_fs_root(gang[i]);
3622 int btrfs_commit_super(struct btrfs_root *root)
3624 struct btrfs_trans_handle *trans;
3626 mutex_lock(&root->fs_info->cleaner_mutex);
3627 btrfs_run_delayed_iputs(root);
3628 mutex_unlock(&root->fs_info->cleaner_mutex);
3629 wake_up_process(root->fs_info->cleaner_kthread);
3631 /* wait until ongoing cleanup work done */
3632 down_write(&root->fs_info->cleanup_work_sem);
3633 up_write(&root->fs_info->cleanup_work_sem);
3635 trans = btrfs_join_transaction(root);
3637 return PTR_ERR(trans);
3638 return btrfs_commit_transaction(trans, root);
3641 void close_ctree(struct btrfs_root *root)
3643 struct btrfs_fs_info *fs_info = root->fs_info;
3646 fs_info->closing = 1;
3649 /* wait for the uuid_scan task to finish */
3650 down(&fs_info->uuid_tree_rescan_sem);
3651 /* avoid complains from lockdep et al., set sem back to initial state */
3652 up(&fs_info->uuid_tree_rescan_sem);
3654 /* pause restriper - we want to resume on mount */
3655 btrfs_pause_balance(fs_info);
3657 btrfs_dev_replace_suspend_for_unmount(fs_info);
3659 btrfs_scrub_cancel(fs_info);
3661 /* wait for any defraggers to finish */
3662 wait_event(fs_info->transaction_wait,
3663 (atomic_read(&fs_info->defrag_running) == 0));
3665 /* clear out the rbtree of defraggable inodes */
3666 btrfs_cleanup_defrag_inodes(fs_info);
3668 cancel_work_sync(&fs_info->async_reclaim_work);
3670 if (!(fs_info->sb->s_flags & MS_RDONLY)) {
3671 ret = btrfs_commit_super(root);
3673 btrfs_err(root->fs_info, "commit super ret %d", ret);
3676 if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state))
3677 btrfs_error_commit_super(root);
3679 kthread_stop(fs_info->transaction_kthread);
3680 kthread_stop(fs_info->cleaner_kthread);
3682 fs_info->closing = 2;
3685 btrfs_free_qgroup_config(root->fs_info);
3687 if (percpu_counter_sum(&fs_info->delalloc_bytes)) {
3688 btrfs_info(root->fs_info, "at unmount delalloc count %lld",
3689 percpu_counter_sum(&fs_info->delalloc_bytes));
3692 btrfs_sysfs_remove_one(fs_info);
3694 btrfs_free_fs_roots(fs_info);
3696 btrfs_put_block_group_cache(fs_info);
3698 btrfs_free_block_groups(fs_info);
3701 * we must make sure there is not any read request to
3702 * submit after we stopping all workers.
3704 invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
3705 btrfs_stop_all_workers(fs_info);
3708 free_root_pointers(fs_info, 1);
3710 iput(fs_info->btree_inode);
3712 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
3713 if (btrfs_test_opt(root, CHECK_INTEGRITY))
3714 btrfsic_unmount(root, fs_info->fs_devices);
3717 btrfs_close_devices(fs_info->fs_devices);
3718 btrfs_mapping_tree_free(&fs_info->mapping_tree);
3720 percpu_counter_destroy(&fs_info->dirty_metadata_bytes);
3721 percpu_counter_destroy(&fs_info->delalloc_bytes);
3722 percpu_counter_destroy(&fs_info->bio_counter);
3723 bdi_destroy(&fs_info->bdi);
3724 cleanup_srcu_struct(&fs_info->subvol_srcu);
3726 btrfs_free_stripe_hash_table(fs_info);
3728 btrfs_free_block_rsv(root, root->orphan_block_rsv);
3729 root->orphan_block_rsv = NULL;
3732 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
3736 struct inode *btree_inode = buf->pages[0]->mapping->host;
3738 ret = extent_buffer_uptodate(buf);
3742 ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf,
3743 parent_transid, atomic);
3749 int btrfs_set_buffer_uptodate(struct extent_buffer *buf)
3751 return set_extent_buffer_uptodate(buf);
3754 void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
3756 struct btrfs_root *root;
3757 u64 transid = btrfs_header_generation(buf);
3760 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3762 * This is a fast path so only do this check if we have sanity tests
3763 * enabled. Normal people shouldn't be marking dummy buffers as dirty
3764 * outside of the sanity tests.
3766 if (unlikely(test_bit(EXTENT_BUFFER_DUMMY, &buf->bflags)))
3769 root = BTRFS_I(buf->pages[0]->mapping->host)->root;
3770 btrfs_assert_tree_locked(buf);
3771 if (transid != root->fs_info->generation)
3772 WARN(1, KERN_CRIT "btrfs transid mismatch buffer %llu, "
3773 "found %llu running %llu\n",
3774 buf->start, transid, root->fs_info->generation);
3775 was_dirty = set_extent_buffer_dirty(buf);
3777 __percpu_counter_add(&root->fs_info->dirty_metadata_bytes,
3779 root->fs_info->dirty_metadata_batch);
3780 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
3781 if (btrfs_header_level(buf) == 0 && check_leaf(root, buf)) {
3782 btrfs_print_leaf(root, buf);
3788 static void __btrfs_btree_balance_dirty(struct btrfs_root *root,
3792 * looks as though older kernels can get into trouble with
3793 * this code, they end up stuck in balance_dirty_pages forever
3797 if (current->flags & PF_MEMALLOC)
3801 btrfs_balance_delayed_items(root);
3803 ret = percpu_counter_compare(&root->fs_info->dirty_metadata_bytes,
3804 BTRFS_DIRTY_METADATA_THRESH);
3806 balance_dirty_pages_ratelimited(
3807 root->fs_info->btree_inode->i_mapping);
3812 void btrfs_btree_balance_dirty(struct btrfs_root *root)
3814 __btrfs_btree_balance_dirty(root, 1);
3817 void btrfs_btree_balance_dirty_nodelay(struct btrfs_root *root)
3819 __btrfs_btree_balance_dirty(root, 0);
3822 int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid)
3824 struct btrfs_root *root = BTRFS_I(buf->pages[0]->mapping->host)->root;
3825 return btree_read_extent_buffer_pages(root, buf, 0, parent_transid);
3828 static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info,
3832 * Placeholder for checks
3837 static void btrfs_error_commit_super(struct btrfs_root *root)
3839 mutex_lock(&root->fs_info->cleaner_mutex);
3840 btrfs_run_delayed_iputs(root);
3841 mutex_unlock(&root->fs_info->cleaner_mutex);
3843 down_write(&root->fs_info->cleanup_work_sem);
3844 up_write(&root->fs_info->cleanup_work_sem);
3846 /* cleanup FS via transaction */
3847 btrfs_cleanup_transaction(root);
3850 static void btrfs_destroy_ordered_extents(struct btrfs_root *root)
3852 struct btrfs_ordered_extent *ordered;
3854 spin_lock(&root->ordered_extent_lock);
3856 * This will just short circuit the ordered completion stuff which will
3857 * make sure the ordered extent gets properly cleaned up.
3859 list_for_each_entry(ordered, &root->ordered_extents,
3861 set_bit(BTRFS_ORDERED_IOERR, &ordered->flags);
3862 spin_unlock(&root->ordered_extent_lock);
3865 static void btrfs_destroy_all_ordered_extents(struct btrfs_fs_info *fs_info)
3867 struct btrfs_root *root;
3868 struct list_head splice;
3870 INIT_LIST_HEAD(&splice);
3872 spin_lock(&fs_info->ordered_root_lock);
3873 list_splice_init(&fs_info->ordered_roots, &splice);
3874 while (!list_empty(&splice)) {
3875 root = list_first_entry(&splice, struct btrfs_root,
3877 list_move_tail(&root->ordered_root,
3878 &fs_info->ordered_roots);
3880 spin_unlock(&fs_info->ordered_root_lock);
3881 btrfs_destroy_ordered_extents(root);
3884 spin_lock(&fs_info->ordered_root_lock);
3886 spin_unlock(&fs_info->ordered_root_lock);
3889 static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans,
3890 struct btrfs_root *root)
3892 struct rb_node *node;
3893 struct btrfs_delayed_ref_root *delayed_refs;
3894 struct btrfs_delayed_ref_node *ref;
3897 delayed_refs = &trans->delayed_refs;
3899 spin_lock(&delayed_refs->lock);
3900 if (atomic_read(&delayed_refs->num_entries) == 0) {
3901 spin_unlock(&delayed_refs->lock);
3902 btrfs_info(root->fs_info, "delayed_refs has NO entry");
3906 while ((node = rb_first(&delayed_refs->href_root)) != NULL) {
3907 struct btrfs_delayed_ref_head *head;
3908 bool pin_bytes = false;
3910 head = rb_entry(node, struct btrfs_delayed_ref_head,
3912 if (!mutex_trylock(&head->mutex)) {
3913 atomic_inc(&head->node.refs);
3914 spin_unlock(&delayed_refs->lock);
3916 mutex_lock(&head->mutex);
3917 mutex_unlock(&head->mutex);
3918 btrfs_put_delayed_ref(&head->node);
3919 spin_lock(&delayed_refs->lock);
3922 spin_lock(&head->lock);
3923 while ((node = rb_first(&head->ref_root)) != NULL) {
3924 ref = rb_entry(node, struct btrfs_delayed_ref_node,
3927 rb_erase(&ref->rb_node, &head->ref_root);
3928 atomic_dec(&delayed_refs->num_entries);
3929 btrfs_put_delayed_ref(ref);
3931 if (head->must_insert_reserved)
3933 btrfs_free_delayed_extent_op(head->extent_op);
3934 delayed_refs->num_heads--;
3935 if (head->processing == 0)
3936 delayed_refs->num_heads_ready--;
3937 atomic_dec(&delayed_refs->num_entries);
3938 head->node.in_tree = 0;
3939 rb_erase(&head->href_node, &delayed_refs->href_root);
3940 spin_unlock(&head->lock);
3941 spin_unlock(&delayed_refs->lock);
3942 mutex_unlock(&head->mutex);
3945 btrfs_pin_extent(root, head->node.bytenr,
3946 head->node.num_bytes, 1);
3947 btrfs_put_delayed_ref(&head->node);
3949 spin_lock(&delayed_refs->lock);
3952 spin_unlock(&delayed_refs->lock);
3957 static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root)
3959 struct btrfs_inode *btrfs_inode;
3960 struct list_head splice;
3962 INIT_LIST_HEAD(&splice);
3964 spin_lock(&root->delalloc_lock);
3965 list_splice_init(&root->delalloc_inodes, &splice);
3967 while (!list_empty(&splice)) {
3968 btrfs_inode = list_first_entry(&splice, struct btrfs_inode,
3971 list_del_init(&btrfs_inode->delalloc_inodes);
3972 clear_bit(BTRFS_INODE_IN_DELALLOC_LIST,
3973 &btrfs_inode->runtime_flags);
3974 spin_unlock(&root->delalloc_lock);
3976 btrfs_invalidate_inodes(btrfs_inode->root);
3978 spin_lock(&root->delalloc_lock);
3981 spin_unlock(&root->delalloc_lock);
3984 static void btrfs_destroy_all_delalloc_inodes(struct btrfs_fs_info *fs_info)
3986 struct btrfs_root *root;
3987 struct list_head splice;
3989 INIT_LIST_HEAD(&splice);
3991 spin_lock(&fs_info->delalloc_root_lock);
3992 list_splice_init(&fs_info->delalloc_roots, &splice);
3993 while (!list_empty(&splice)) {
3994 root = list_first_entry(&splice, struct btrfs_root,
3996 list_del_init(&root->delalloc_root);
3997 root = btrfs_grab_fs_root(root);
3999 spin_unlock(&fs_info->delalloc_root_lock);
4001 btrfs_destroy_delalloc_inodes(root);
4002 btrfs_put_fs_root(root);
4004 spin_lock(&fs_info->delalloc_root_lock);
4006 spin_unlock(&fs_info->delalloc_root_lock);
4009 static int btrfs_destroy_marked_extents(struct btrfs_root *root,
4010 struct extent_io_tree *dirty_pages,
4014 struct extent_buffer *eb;
4019 ret = find_first_extent_bit(dirty_pages, start, &start, &end,
4024 clear_extent_bits(dirty_pages, start, end, mark, GFP_NOFS);
4025 while (start <= end) {
4026 eb = btrfs_find_tree_block(root, start,
4028 start += root->nodesize;
4031 wait_on_extent_buffer_writeback(eb);
4033 if (test_and_clear_bit(EXTENT_BUFFER_DIRTY,
4035 clear_extent_buffer_dirty(eb);
4036 free_extent_buffer_stale(eb);
4043 static int btrfs_destroy_pinned_extent(struct btrfs_root *root,
4044 struct extent_io_tree *pinned_extents)
4046 struct extent_io_tree *unpin;
4052 unpin = pinned_extents;
4055 ret = find_first_extent_bit(unpin, 0, &start, &end,
4056 EXTENT_DIRTY, NULL);
4061 if (btrfs_test_opt(root, DISCARD))
4062 ret = btrfs_error_discard_extent(root, start,
4066 clear_extent_dirty(unpin, start, end, GFP_NOFS);
4067 btrfs_error_unpin_extent_range(root, start, end);
4072 if (unpin == &root->fs_info->freed_extents[0])
4073 unpin = &root->fs_info->freed_extents[1];
4075 unpin = &root->fs_info->freed_extents[0];
4083 void btrfs_cleanup_one_transaction(struct btrfs_transaction *cur_trans,
4084 struct btrfs_root *root)
4086 btrfs_destroy_delayed_refs(cur_trans, root);
4088 cur_trans->state = TRANS_STATE_COMMIT_START;
4089 wake_up(&root->fs_info->transaction_blocked_wait);
4091 cur_trans->state = TRANS_STATE_UNBLOCKED;
4092 wake_up(&root->fs_info->transaction_wait);
4094 btrfs_destroy_delayed_inodes(root);
4095 btrfs_assert_delayed_root_empty(root);
4097 btrfs_destroy_marked_extents(root, &cur_trans->dirty_pages,
4099 btrfs_destroy_pinned_extent(root,
4100 root->fs_info->pinned_extents);
4102 cur_trans->state =TRANS_STATE_COMPLETED;
4103 wake_up(&cur_trans->commit_wait);
4106 memset(cur_trans, 0, sizeof(*cur_trans));
4107 kmem_cache_free(btrfs_transaction_cachep, cur_trans);
4111 static int btrfs_cleanup_transaction(struct btrfs_root *root)
4113 struct btrfs_transaction *t;
4115 mutex_lock(&root->fs_info->transaction_kthread_mutex);
4117 spin_lock(&root->fs_info->trans_lock);
4118 while (!list_empty(&root->fs_info->trans_list)) {
4119 t = list_first_entry(&root->fs_info->trans_list,
4120 struct btrfs_transaction, list);
4121 if (t->state >= TRANS_STATE_COMMIT_START) {
4122 atomic_inc(&t->use_count);
4123 spin_unlock(&root->fs_info->trans_lock);
4124 btrfs_wait_for_commit(root, t->transid);
4125 btrfs_put_transaction(t);
4126 spin_lock(&root->fs_info->trans_lock);
4129 if (t == root->fs_info->running_transaction) {
4130 t->state = TRANS_STATE_COMMIT_DOING;
4131 spin_unlock(&root->fs_info->trans_lock);
4133 * We wait for 0 num_writers since we don't hold a trans
4134 * handle open currently for this transaction.
4136 wait_event(t->writer_wait,
4137 atomic_read(&t->num_writers) == 0);
4139 spin_unlock(&root->fs_info->trans_lock);
4141 btrfs_cleanup_one_transaction(t, root);
4143 spin_lock(&root->fs_info->trans_lock);
4144 if (t == root->fs_info->running_transaction)
4145 root->fs_info->running_transaction = NULL;
4146 list_del_init(&t->list);
4147 spin_unlock(&root->fs_info->trans_lock);
4149 btrfs_put_transaction(t);
4150 trace_btrfs_transaction_commit(root);
4151 spin_lock(&root->fs_info->trans_lock);
4153 spin_unlock(&root->fs_info->trans_lock);
4154 btrfs_destroy_all_ordered_extents(root->fs_info);
4155 btrfs_destroy_delayed_inodes(root);
4156 btrfs_assert_delayed_root_empty(root);
4157 btrfs_destroy_pinned_extent(root, root->fs_info->pinned_extents);
4158 btrfs_destroy_all_delalloc_inodes(root->fs_info);
4159 mutex_unlock(&root->fs_info->transaction_kthread_mutex);
4164 static struct extent_io_ops btree_extent_io_ops = {
4165 .readpage_end_io_hook = btree_readpage_end_io_hook,
4166 .readpage_io_failed_hook = btree_io_failed_hook,
4167 .submit_bio_hook = btree_submit_bio_hook,
4168 /* note we're sharing with inode.c for the merge bio hook */
4169 .merge_bio_hook = btrfs_merge_bio_hook,