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/crc32c.h>
30 #include <linux/slab.h>
34 #include "transaction.h"
35 #include "btrfs_inode.h"
37 #include "print-tree.h"
38 #include "async-thread.h"
41 #include "free-space-cache.h"
43 static struct extent_io_ops btree_extent_io_ops;
44 static void end_workqueue_fn(struct btrfs_work *work);
45 static void free_fs_root(struct btrfs_root *root);
47 static atomic_t btrfs_bdi_num = ATOMIC_INIT(0);
50 * end_io_wq structs are used to do processing in task context when an IO is
51 * complete. This is used during reads to verify checksums, and it is used
52 * by writes to insert metadata for new file extents after IO is complete.
58 struct btrfs_fs_info *info;
61 struct list_head list;
62 struct btrfs_work work;
66 * async submit bios are used to offload expensive checksumming
67 * onto the worker threads. They checksum file and metadata bios
68 * just before they are sent down the IO stack.
70 struct async_submit_bio {
73 struct list_head list;
74 extent_submit_bio_hook_t *submit_bio_start;
75 extent_submit_bio_hook_t *submit_bio_done;
78 unsigned long bio_flags;
79 struct btrfs_work work;
82 /* These are used to set the lockdep class on the extent buffer locks.
83 * The class is set by the readpage_end_io_hook after the buffer has
84 * passed csum validation but before the pages are unlocked.
86 * The lockdep class is also set by btrfs_init_new_buffer on freshly
89 * The class is based on the level in the tree block, which allows lockdep
90 * to know that lower nodes nest inside the locks of higher nodes.
92 * We also add a check to make sure the highest level of the tree is
93 * the same as our lockdep setup here. If BTRFS_MAX_LEVEL changes, this
94 * code needs update as well.
96 #ifdef CONFIG_DEBUG_LOCK_ALLOC
97 # if BTRFS_MAX_LEVEL != 8
100 static struct lock_class_key btrfs_eb_class[BTRFS_MAX_LEVEL + 1];
101 static const char *btrfs_eb_name[BTRFS_MAX_LEVEL + 1] = {
111 /* highest possible level */
117 * extents on the btree inode are pretty simple, there's one extent
118 * that covers the entire device
120 static struct extent_map *btree_get_extent(struct inode *inode,
121 struct page *page, size_t page_offset, u64 start, u64 len,
124 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
125 struct extent_map *em;
128 read_lock(&em_tree->lock);
129 em = lookup_extent_mapping(em_tree, start, len);
132 BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev;
133 read_unlock(&em_tree->lock);
136 read_unlock(&em_tree->lock);
138 em = alloc_extent_map(GFP_NOFS);
140 em = ERR_PTR(-ENOMEM);
145 em->block_len = (u64)-1;
147 em->bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev;
149 write_lock(&em_tree->lock);
150 ret = add_extent_mapping(em_tree, em);
151 if (ret == -EEXIST) {
152 u64 failed_start = em->start;
153 u64 failed_len = em->len;
156 em = lookup_extent_mapping(em_tree, start, len);
160 em = lookup_extent_mapping(em_tree, failed_start,
168 write_unlock(&em_tree->lock);
176 u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len)
178 return crc32c(seed, data, len);
181 void btrfs_csum_final(u32 crc, char *result)
183 *(__le32 *)result = ~cpu_to_le32(crc);
187 * compute the csum for a btree block, and either verify it or write it
188 * into the csum field of the block.
190 static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
194 btrfs_super_csum_size(&root->fs_info->super_copy);
197 unsigned long cur_len;
198 unsigned long offset = BTRFS_CSUM_SIZE;
199 char *map_token = NULL;
201 unsigned long map_start;
202 unsigned long map_len;
205 unsigned long inline_result;
207 len = buf->len - offset;
209 err = map_private_extent_buffer(buf, offset, 32,
211 &map_start, &map_len, KM_USER0);
214 cur_len = min(len, map_len - (offset - map_start));
215 crc = btrfs_csum_data(root, kaddr + offset - map_start,
219 unmap_extent_buffer(buf, map_token, KM_USER0);
221 if (csum_size > sizeof(inline_result)) {
222 result = kzalloc(csum_size * sizeof(char), GFP_NOFS);
226 result = (char *)&inline_result;
229 btrfs_csum_final(crc, result);
232 if (memcmp_extent_buffer(buf, result, 0, csum_size)) {
235 memcpy(&found, result, csum_size);
237 read_extent_buffer(buf, &val, 0, csum_size);
238 if (printk_ratelimit()) {
239 printk(KERN_INFO "btrfs: %s checksum verify "
240 "failed on %llu wanted %X found %X "
242 root->fs_info->sb->s_id,
243 (unsigned long long)buf->start, val, found,
244 btrfs_header_level(buf));
246 if (result != (char *)&inline_result)
251 write_extent_buffer(buf, result, 0, csum_size);
253 if (result != (char *)&inline_result)
259 * we can't consider a given block up to date unless the transid of the
260 * block matches the transid in the parent node's pointer. This is how we
261 * detect blocks that either didn't get written at all or got written
262 * in the wrong place.
264 static int verify_parent_transid(struct extent_io_tree *io_tree,
265 struct extent_buffer *eb, u64 parent_transid)
267 struct extent_state *cached_state = NULL;
270 if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
273 lock_extent_bits(io_tree, eb->start, eb->start + eb->len - 1,
274 0, &cached_state, GFP_NOFS);
275 if (extent_buffer_uptodate(io_tree, eb, cached_state) &&
276 btrfs_header_generation(eb) == parent_transid) {
280 if (printk_ratelimit()) {
281 printk("parent transid verify failed on %llu wanted %llu "
283 (unsigned long long)eb->start,
284 (unsigned long long)parent_transid,
285 (unsigned long long)btrfs_header_generation(eb));
288 clear_extent_buffer_uptodate(io_tree, eb, &cached_state);
290 unlock_extent_cached(io_tree, eb->start, eb->start + eb->len - 1,
291 &cached_state, GFP_NOFS);
296 * helper to read a given tree block, doing retries as required when
297 * the checksums don't match and we have alternate mirrors to try.
299 static int btree_read_extent_buffer_pages(struct btrfs_root *root,
300 struct extent_buffer *eb,
301 u64 start, u64 parent_transid)
303 struct extent_io_tree *io_tree;
308 io_tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree;
310 ret = read_extent_buffer_pages(io_tree, eb, start, 1,
311 btree_get_extent, mirror_num);
313 !verify_parent_transid(io_tree, eb, parent_transid))
316 num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
322 if (mirror_num > num_copies)
329 * checksum a dirty tree block before IO. This has extra checks to make sure
330 * we only fill in the checksum field in the first page of a multi-page block
333 static int csum_dirty_buffer(struct btrfs_root *root, struct page *page)
335 struct extent_io_tree *tree;
336 u64 start = (u64)page->index << PAGE_CACHE_SHIFT;
340 struct extent_buffer *eb;
343 tree = &BTRFS_I(page->mapping->host)->io_tree;
345 if (page->private == EXTENT_PAGE_PRIVATE)
349 len = page->private >> 2;
352 eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS);
353 ret = btree_read_extent_buffer_pages(root, eb, start + PAGE_CACHE_SIZE,
354 btrfs_header_generation(eb));
356 found_start = btrfs_header_bytenr(eb);
357 if (found_start != start) {
361 if (eb->first_page != page) {
365 if (!PageUptodate(page)) {
369 found_level = btrfs_header_level(eb);
371 csum_tree_block(root, eb, 0);
373 free_extent_buffer(eb);
378 static int check_tree_block_fsid(struct btrfs_root *root,
379 struct extent_buffer *eb)
381 struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
382 u8 fsid[BTRFS_UUID_SIZE];
385 read_extent_buffer(eb, fsid, (unsigned long)btrfs_header_fsid(eb),
388 if (!memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE)) {
392 fs_devices = fs_devices->seed;
397 #ifdef CONFIG_DEBUG_LOCK_ALLOC
398 void btrfs_set_buffer_lockdep_class(struct extent_buffer *eb, int level)
400 lockdep_set_class_and_name(&eb->lock,
401 &btrfs_eb_class[level],
402 btrfs_eb_name[level]);
406 static int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end,
407 struct extent_state *state)
409 struct extent_io_tree *tree;
413 struct extent_buffer *eb;
414 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
417 tree = &BTRFS_I(page->mapping->host)->io_tree;
418 if (page->private == EXTENT_PAGE_PRIVATE)
423 len = page->private >> 2;
426 eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS);
428 found_start = btrfs_header_bytenr(eb);
429 if (found_start != start) {
430 if (printk_ratelimit()) {
431 printk(KERN_INFO "btrfs bad tree block start "
433 (unsigned long long)found_start,
434 (unsigned long long)eb->start);
439 if (eb->first_page != page) {
440 printk(KERN_INFO "btrfs bad first page %lu %lu\n",
441 eb->first_page->index, page->index);
446 if (check_tree_block_fsid(root, eb)) {
447 if (printk_ratelimit()) {
448 printk(KERN_INFO "btrfs bad fsid on block %llu\n",
449 (unsigned long long)eb->start);
454 found_level = btrfs_header_level(eb);
456 btrfs_set_buffer_lockdep_class(eb, found_level);
458 ret = csum_tree_block(root, eb, 1);
462 end = min_t(u64, eb->len, PAGE_CACHE_SIZE);
463 end = eb->start + end - 1;
465 free_extent_buffer(eb);
470 static void end_workqueue_bio(struct bio *bio, int err)
472 struct end_io_wq *end_io_wq = bio->bi_private;
473 struct btrfs_fs_info *fs_info;
475 fs_info = end_io_wq->info;
476 end_io_wq->error = err;
477 end_io_wq->work.func = end_workqueue_fn;
478 end_io_wq->work.flags = 0;
480 if (bio->bi_rw & (1 << BIO_RW)) {
481 if (end_io_wq->metadata)
482 btrfs_queue_worker(&fs_info->endio_meta_write_workers,
485 btrfs_queue_worker(&fs_info->endio_write_workers,
488 if (end_io_wq->metadata)
489 btrfs_queue_worker(&fs_info->endio_meta_workers,
492 btrfs_queue_worker(&fs_info->endio_workers,
497 int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
500 struct end_io_wq *end_io_wq;
501 end_io_wq = kmalloc(sizeof(*end_io_wq), GFP_NOFS);
505 end_io_wq->private = bio->bi_private;
506 end_io_wq->end_io = bio->bi_end_io;
507 end_io_wq->info = info;
508 end_io_wq->error = 0;
509 end_io_wq->bio = bio;
510 end_io_wq->metadata = metadata;
512 bio->bi_private = end_io_wq;
513 bio->bi_end_io = end_workqueue_bio;
517 unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info)
519 unsigned long limit = min_t(unsigned long,
520 info->workers.max_workers,
521 info->fs_devices->open_devices);
525 int btrfs_congested_async(struct btrfs_fs_info *info, int iodone)
527 return atomic_read(&info->nr_async_bios) >
528 btrfs_async_submit_limit(info);
531 static void run_one_async_start(struct btrfs_work *work)
533 struct btrfs_fs_info *fs_info;
534 struct async_submit_bio *async;
536 async = container_of(work, struct async_submit_bio, work);
537 fs_info = BTRFS_I(async->inode)->root->fs_info;
538 async->submit_bio_start(async->inode, async->rw, async->bio,
539 async->mirror_num, async->bio_flags);
542 static void run_one_async_done(struct btrfs_work *work)
544 struct btrfs_fs_info *fs_info;
545 struct async_submit_bio *async;
548 async = container_of(work, struct async_submit_bio, work);
549 fs_info = BTRFS_I(async->inode)->root->fs_info;
551 limit = btrfs_async_submit_limit(fs_info);
552 limit = limit * 2 / 3;
554 atomic_dec(&fs_info->nr_async_submits);
556 if (atomic_read(&fs_info->nr_async_submits) < limit &&
557 waitqueue_active(&fs_info->async_submit_wait))
558 wake_up(&fs_info->async_submit_wait);
560 async->submit_bio_done(async->inode, async->rw, async->bio,
561 async->mirror_num, async->bio_flags);
564 static void run_one_async_free(struct btrfs_work *work)
566 struct async_submit_bio *async;
568 async = container_of(work, struct async_submit_bio, work);
572 int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
573 int rw, struct bio *bio, int mirror_num,
574 unsigned long bio_flags,
575 extent_submit_bio_hook_t *submit_bio_start,
576 extent_submit_bio_hook_t *submit_bio_done)
578 struct async_submit_bio *async;
580 async = kmalloc(sizeof(*async), GFP_NOFS);
584 async->inode = inode;
587 async->mirror_num = mirror_num;
588 async->submit_bio_start = submit_bio_start;
589 async->submit_bio_done = submit_bio_done;
591 async->work.func = run_one_async_start;
592 async->work.ordered_func = run_one_async_done;
593 async->work.ordered_free = run_one_async_free;
595 async->work.flags = 0;
596 async->bio_flags = bio_flags;
598 atomic_inc(&fs_info->nr_async_submits);
600 if (rw & (1 << BIO_RW_SYNCIO))
601 btrfs_set_work_high_prio(&async->work);
603 btrfs_queue_worker(&fs_info->workers, &async->work);
605 while (atomic_read(&fs_info->async_submit_draining) &&
606 atomic_read(&fs_info->nr_async_submits)) {
607 wait_event(fs_info->async_submit_wait,
608 (atomic_read(&fs_info->nr_async_submits) == 0));
614 static int btree_csum_one_bio(struct bio *bio)
616 struct bio_vec *bvec = bio->bi_io_vec;
618 struct btrfs_root *root;
620 WARN_ON(bio->bi_vcnt <= 0);
621 while (bio_index < bio->bi_vcnt) {
622 root = BTRFS_I(bvec->bv_page->mapping->host)->root;
623 csum_dirty_buffer(root, bvec->bv_page);
630 static int __btree_submit_bio_start(struct inode *inode, int rw,
631 struct bio *bio, int mirror_num,
632 unsigned long bio_flags)
635 * when we're called for a write, we're already in the async
636 * submission context. Just jump into btrfs_map_bio
638 btree_csum_one_bio(bio);
642 static int __btree_submit_bio_done(struct inode *inode, int rw, struct bio *bio,
643 int mirror_num, unsigned long bio_flags)
646 * when we're called for a write, we're already in the async
647 * submission context. Just jump into btrfs_map_bio
649 return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num, 1);
652 static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
653 int mirror_num, unsigned long bio_flags)
657 ret = btrfs_bio_wq_end_io(BTRFS_I(inode)->root->fs_info,
661 if (!(rw & (1 << BIO_RW))) {
663 * called for a read, do the setup so that checksum validation
664 * can happen in the async kernel threads
666 return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio,
671 * kthread helpers are used to submit writes so that checksumming
672 * can happen in parallel across all CPUs
674 return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info,
675 inode, rw, bio, mirror_num, 0,
676 __btree_submit_bio_start,
677 __btree_submit_bio_done);
680 static int btree_writepage(struct page *page, struct writeback_control *wbc)
682 struct extent_io_tree *tree;
683 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
684 struct extent_buffer *eb;
687 tree = &BTRFS_I(page->mapping->host)->io_tree;
688 if (!(current->flags & PF_MEMALLOC)) {
689 return extent_write_full_page(tree, page,
690 btree_get_extent, wbc);
693 redirty_page_for_writepage(wbc, page);
694 eb = btrfs_find_tree_block(root, page_offset(page),
698 was_dirty = test_and_set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags);
700 spin_lock(&root->fs_info->delalloc_lock);
701 root->fs_info->dirty_metadata_bytes += PAGE_CACHE_SIZE;
702 spin_unlock(&root->fs_info->delalloc_lock);
704 free_extent_buffer(eb);
710 static int btree_writepages(struct address_space *mapping,
711 struct writeback_control *wbc)
713 struct extent_io_tree *tree;
714 tree = &BTRFS_I(mapping->host)->io_tree;
715 if (wbc->sync_mode == WB_SYNC_NONE) {
716 struct btrfs_root *root = BTRFS_I(mapping->host)->root;
718 unsigned long thresh = 32 * 1024 * 1024;
720 if (wbc->for_kupdate)
723 /* this is a bit racy, but that's ok */
724 num_dirty = root->fs_info->dirty_metadata_bytes;
725 if (num_dirty < thresh)
728 return extent_writepages(tree, mapping, btree_get_extent, wbc);
731 static int btree_readpage(struct file *file, struct page *page)
733 struct extent_io_tree *tree;
734 tree = &BTRFS_I(page->mapping->host)->io_tree;
735 return extent_read_full_page(tree, page, btree_get_extent);
738 static int btree_releasepage(struct page *page, gfp_t gfp_flags)
740 struct extent_io_tree *tree;
741 struct extent_map_tree *map;
744 if (PageWriteback(page) || PageDirty(page))
747 tree = &BTRFS_I(page->mapping->host)->io_tree;
748 map = &BTRFS_I(page->mapping->host)->extent_tree;
750 ret = try_release_extent_state(map, tree, page, gfp_flags);
754 ret = try_release_extent_buffer(tree, page);
756 ClearPagePrivate(page);
757 set_page_private(page, 0);
758 page_cache_release(page);
764 static void btree_invalidatepage(struct page *page, unsigned long offset)
766 struct extent_io_tree *tree;
767 tree = &BTRFS_I(page->mapping->host)->io_tree;
768 extent_invalidatepage(tree, page, offset);
769 btree_releasepage(page, GFP_NOFS);
770 if (PagePrivate(page)) {
771 printk(KERN_WARNING "btrfs warning page private not zero "
772 "on page %llu\n", (unsigned long long)page_offset(page));
773 ClearPagePrivate(page);
774 set_page_private(page, 0);
775 page_cache_release(page);
779 static const struct address_space_operations btree_aops = {
780 .readpage = btree_readpage,
781 .writepage = btree_writepage,
782 .writepages = btree_writepages,
783 .releasepage = btree_releasepage,
784 .invalidatepage = btree_invalidatepage,
785 .sync_page = block_sync_page,
788 int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
791 struct extent_buffer *buf = NULL;
792 struct inode *btree_inode = root->fs_info->btree_inode;
795 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
798 read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree,
799 buf, 0, 0, btree_get_extent, 0);
800 free_extent_buffer(buf);
804 struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
805 u64 bytenr, u32 blocksize)
807 struct inode *btree_inode = root->fs_info->btree_inode;
808 struct extent_buffer *eb;
809 eb = find_extent_buffer(&BTRFS_I(btree_inode)->io_tree,
810 bytenr, blocksize, GFP_NOFS);
814 struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
815 u64 bytenr, u32 blocksize)
817 struct inode *btree_inode = root->fs_info->btree_inode;
818 struct extent_buffer *eb;
820 eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->io_tree,
821 bytenr, blocksize, NULL, GFP_NOFS);
826 int btrfs_write_tree_block(struct extent_buffer *buf)
828 return filemap_fdatawrite_range(buf->first_page->mapping, buf->start,
829 buf->start + buf->len - 1);
832 int btrfs_wait_tree_block_writeback(struct extent_buffer *buf)
834 return filemap_fdatawait_range(buf->first_page->mapping,
835 buf->start, buf->start + buf->len - 1);
838 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
839 u32 blocksize, u64 parent_transid)
841 struct extent_buffer *buf = NULL;
842 struct inode *btree_inode = root->fs_info->btree_inode;
843 struct extent_io_tree *io_tree;
846 io_tree = &BTRFS_I(btree_inode)->io_tree;
848 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
852 ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid);
855 set_bit(EXTENT_BUFFER_UPTODATE, &buf->bflags);
860 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
861 struct extent_buffer *buf)
863 struct inode *btree_inode = root->fs_info->btree_inode;
864 if (btrfs_header_generation(buf) ==
865 root->fs_info->running_transaction->transid) {
866 btrfs_assert_tree_locked(buf);
868 if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)) {
869 spin_lock(&root->fs_info->delalloc_lock);
870 if (root->fs_info->dirty_metadata_bytes >= buf->len)
871 root->fs_info->dirty_metadata_bytes -= buf->len;
874 spin_unlock(&root->fs_info->delalloc_lock);
877 /* ugh, clear_extent_buffer_dirty needs to lock the page */
878 btrfs_set_lock_blocking(buf);
879 clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree,
885 static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
886 u32 stripesize, struct btrfs_root *root,
887 struct btrfs_fs_info *fs_info,
891 root->commit_root = NULL;
892 root->sectorsize = sectorsize;
893 root->nodesize = nodesize;
894 root->leafsize = leafsize;
895 root->stripesize = stripesize;
897 root->track_dirty = 0;
899 root->clean_orphans = 0;
901 root->fs_info = fs_info;
902 root->objectid = objectid;
903 root->last_trans = 0;
904 root->highest_objectid = 0;
907 root->inode_tree = RB_ROOT;
909 INIT_LIST_HEAD(&root->dirty_list);
910 INIT_LIST_HEAD(&root->orphan_list);
911 INIT_LIST_HEAD(&root->root_list);
912 spin_lock_init(&root->node_lock);
913 spin_lock_init(&root->list_lock);
914 spin_lock_init(&root->inode_lock);
915 mutex_init(&root->objectid_mutex);
916 mutex_init(&root->log_mutex);
917 init_waitqueue_head(&root->log_writer_wait);
918 init_waitqueue_head(&root->log_commit_wait[0]);
919 init_waitqueue_head(&root->log_commit_wait[1]);
920 atomic_set(&root->log_commit[0], 0);
921 atomic_set(&root->log_commit[1], 0);
922 atomic_set(&root->log_writers, 0);
924 root->log_transid = 0;
925 root->last_log_commit = 0;
926 extent_io_tree_init(&root->dirty_log_pages,
927 fs_info->btree_inode->i_mapping, GFP_NOFS);
929 memset(&root->root_key, 0, sizeof(root->root_key));
930 memset(&root->root_item, 0, sizeof(root->root_item));
931 memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
932 memset(&root->root_kobj, 0, sizeof(root->root_kobj));
933 root->defrag_trans_start = fs_info->generation;
934 init_completion(&root->kobj_unregister);
935 root->defrag_running = 0;
936 root->root_key.objectid = objectid;
937 root->anon_super.s_root = NULL;
938 root->anon_super.s_dev = 0;
939 INIT_LIST_HEAD(&root->anon_super.s_list);
940 INIT_LIST_HEAD(&root->anon_super.s_instances);
941 init_rwsem(&root->anon_super.s_umount);
946 static int find_and_setup_root(struct btrfs_root *tree_root,
947 struct btrfs_fs_info *fs_info,
949 struct btrfs_root *root)
955 __setup_root(tree_root->nodesize, tree_root->leafsize,
956 tree_root->sectorsize, tree_root->stripesize,
957 root, fs_info, objectid);
958 ret = btrfs_find_last_root(tree_root, objectid,
959 &root->root_item, &root->root_key);
964 generation = btrfs_root_generation(&root->root_item);
965 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
966 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
967 blocksize, generation);
969 root->commit_root = btrfs_root_node(root);
973 int btrfs_free_log_root_tree(struct btrfs_trans_handle *trans,
974 struct btrfs_fs_info *fs_info)
976 struct extent_buffer *eb;
977 struct btrfs_root *log_root_tree = fs_info->log_root_tree;
986 ret = find_first_extent_bit(&log_root_tree->dirty_log_pages,
987 0, &start, &end, EXTENT_DIRTY | EXTENT_NEW);
991 clear_extent_bits(&log_root_tree->dirty_log_pages, start, end,
992 EXTENT_DIRTY | EXTENT_NEW, GFP_NOFS);
994 eb = fs_info->log_root_tree->node;
996 WARN_ON(btrfs_header_level(eb) != 0);
997 WARN_ON(btrfs_header_nritems(eb) != 0);
999 ret = btrfs_free_reserved_extent(fs_info->tree_root,
1000 eb->start, eb->len);
1003 free_extent_buffer(eb);
1004 kfree(fs_info->log_root_tree);
1005 fs_info->log_root_tree = NULL;
1009 static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans,
1010 struct btrfs_fs_info *fs_info)
1012 struct btrfs_root *root;
1013 struct btrfs_root *tree_root = fs_info->tree_root;
1014 struct extent_buffer *leaf;
1016 root = kzalloc(sizeof(*root), GFP_NOFS);
1018 return ERR_PTR(-ENOMEM);
1020 __setup_root(tree_root->nodesize, tree_root->leafsize,
1021 tree_root->sectorsize, tree_root->stripesize,
1022 root, fs_info, BTRFS_TREE_LOG_OBJECTID);
1024 root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID;
1025 root->root_key.type = BTRFS_ROOT_ITEM_KEY;
1026 root->root_key.offset = BTRFS_TREE_LOG_OBJECTID;
1028 * log trees do not get reference counted because they go away
1029 * before a real commit is actually done. They do store pointers
1030 * to file data extents, and those reference counts still get
1031 * updated (along with back refs to the log tree).
1035 leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0,
1036 BTRFS_TREE_LOG_OBJECTID, NULL, 0, 0, 0);
1039 return ERR_CAST(leaf);
1042 memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header));
1043 btrfs_set_header_bytenr(leaf, leaf->start);
1044 btrfs_set_header_generation(leaf, trans->transid);
1045 btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV);
1046 btrfs_set_header_owner(leaf, BTRFS_TREE_LOG_OBJECTID);
1049 write_extent_buffer(root->node, root->fs_info->fsid,
1050 (unsigned long)btrfs_header_fsid(root->node),
1052 btrfs_mark_buffer_dirty(root->node);
1053 btrfs_tree_unlock(root->node);
1057 int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
1058 struct btrfs_fs_info *fs_info)
1060 struct btrfs_root *log_root;
1062 log_root = alloc_log_tree(trans, fs_info);
1063 if (IS_ERR(log_root))
1064 return PTR_ERR(log_root);
1065 WARN_ON(fs_info->log_root_tree);
1066 fs_info->log_root_tree = log_root;
1070 int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
1071 struct btrfs_root *root)
1073 struct btrfs_root *log_root;
1074 struct btrfs_inode_item *inode_item;
1076 log_root = alloc_log_tree(trans, root->fs_info);
1077 if (IS_ERR(log_root))
1078 return PTR_ERR(log_root);
1080 log_root->last_trans = trans->transid;
1081 log_root->root_key.offset = root->root_key.objectid;
1083 inode_item = &log_root->root_item.inode;
1084 inode_item->generation = cpu_to_le64(1);
1085 inode_item->size = cpu_to_le64(3);
1086 inode_item->nlink = cpu_to_le32(1);
1087 inode_item->nbytes = cpu_to_le64(root->leafsize);
1088 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
1090 btrfs_set_root_node(&log_root->root_item, log_root->node);
1092 WARN_ON(root->log_root);
1093 root->log_root = log_root;
1094 root->log_transid = 0;
1095 root->last_log_commit = 0;
1099 struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root,
1100 struct btrfs_key *location)
1102 struct btrfs_root *root;
1103 struct btrfs_fs_info *fs_info = tree_root->fs_info;
1104 struct btrfs_path *path;
1105 struct extent_buffer *l;
1110 root = kzalloc(sizeof(*root), GFP_NOFS);
1112 return ERR_PTR(-ENOMEM);
1113 if (location->offset == (u64)-1) {
1114 ret = find_and_setup_root(tree_root, fs_info,
1115 location->objectid, root);
1118 return ERR_PTR(ret);
1123 __setup_root(tree_root->nodesize, tree_root->leafsize,
1124 tree_root->sectorsize, tree_root->stripesize,
1125 root, fs_info, location->objectid);
1127 path = btrfs_alloc_path();
1129 ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
1132 read_extent_buffer(l, &root->root_item,
1133 btrfs_item_ptr_offset(l, path->slots[0]),
1134 sizeof(root->root_item));
1135 memcpy(&root->root_key, location, sizeof(*location));
1137 btrfs_free_path(path);
1141 return ERR_PTR(ret);
1144 generation = btrfs_root_generation(&root->root_item);
1145 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
1146 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
1147 blocksize, generation);
1148 root->commit_root = btrfs_root_node(root);
1149 BUG_ON(!root->node);
1151 if (location->objectid != BTRFS_TREE_LOG_OBJECTID)
1157 struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
1160 struct btrfs_root *root;
1162 if (root_objectid == BTRFS_ROOT_TREE_OBJECTID)
1163 return fs_info->tree_root;
1164 if (root_objectid == BTRFS_EXTENT_TREE_OBJECTID)
1165 return fs_info->extent_root;
1167 root = radix_tree_lookup(&fs_info->fs_roots_radix,
1168 (unsigned long)root_objectid);
1172 struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
1173 struct btrfs_key *location)
1175 struct btrfs_root *root;
1178 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
1179 return fs_info->tree_root;
1180 if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
1181 return fs_info->extent_root;
1182 if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
1183 return fs_info->chunk_root;
1184 if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
1185 return fs_info->dev_root;
1186 if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
1187 return fs_info->csum_root;
1189 spin_lock(&fs_info->fs_roots_radix_lock);
1190 root = radix_tree_lookup(&fs_info->fs_roots_radix,
1191 (unsigned long)location->objectid);
1192 spin_unlock(&fs_info->fs_roots_radix_lock);
1196 ret = btrfs_find_orphan_item(fs_info->tree_root, location->objectid);
1200 return ERR_PTR(ret);
1202 root = btrfs_read_fs_root_no_radix(fs_info->tree_root, location);
1206 WARN_ON(btrfs_root_refs(&root->root_item) == 0);
1207 set_anon_super(&root->anon_super, NULL);
1209 ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM);
1213 spin_lock(&fs_info->fs_roots_radix_lock);
1214 ret = radix_tree_insert(&fs_info->fs_roots_radix,
1215 (unsigned long)root->root_key.objectid,
1219 root->clean_orphans = 1;
1221 spin_unlock(&fs_info->fs_roots_radix_lock);
1222 radix_tree_preload_end();
1224 if (ret == -EEXIST) {
1231 ret = btrfs_find_dead_roots(fs_info->tree_root,
1232 root->root_key.objectid);
1237 return ERR_PTR(ret);
1240 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
1241 struct btrfs_key *location,
1242 const char *name, int namelen)
1244 return btrfs_read_fs_root_no_name(fs_info, location);
1246 struct btrfs_root *root;
1249 root = btrfs_read_fs_root_no_name(fs_info, location);
1256 ret = btrfs_set_root_name(root, name, namelen);
1258 free_extent_buffer(root->node);
1260 return ERR_PTR(ret);
1263 ret = btrfs_sysfs_add_root(root);
1265 free_extent_buffer(root->node);
1268 return ERR_PTR(ret);
1275 static int btrfs_congested_fn(void *congested_data, int bdi_bits)
1277 struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data;
1279 struct btrfs_device *device;
1280 struct backing_dev_info *bdi;
1282 list_for_each_entry(device, &info->fs_devices->devices, dev_list) {
1285 bdi = blk_get_backing_dev_info(device->bdev);
1286 if (bdi && bdi_congested(bdi, bdi_bits)) {
1295 * this unplugs every device on the box, and it is only used when page
1298 static void __unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
1300 struct btrfs_device *device;
1301 struct btrfs_fs_info *info;
1303 info = (struct btrfs_fs_info *)bdi->unplug_io_data;
1304 list_for_each_entry(device, &info->fs_devices->devices, dev_list) {
1308 bdi = blk_get_backing_dev_info(device->bdev);
1309 if (bdi->unplug_io_fn)
1310 bdi->unplug_io_fn(bdi, page);
1314 static void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
1316 struct inode *inode;
1317 struct extent_map_tree *em_tree;
1318 struct extent_map *em;
1319 struct address_space *mapping;
1322 /* the generic O_DIRECT read code does this */
1324 __unplug_io_fn(bdi, page);
1329 * page->mapping may change at any time. Get a consistent copy
1330 * and use that for everything below
1333 mapping = page->mapping;
1337 inode = mapping->host;
1340 * don't do the expensive searching for a small number of
1343 if (BTRFS_I(inode)->root->fs_info->fs_devices->open_devices <= 2) {
1344 __unplug_io_fn(bdi, page);
1348 offset = page_offset(page);
1350 em_tree = &BTRFS_I(inode)->extent_tree;
1351 read_lock(&em_tree->lock);
1352 em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);
1353 read_unlock(&em_tree->lock);
1355 __unplug_io_fn(bdi, page);
1359 if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
1360 free_extent_map(em);
1361 __unplug_io_fn(bdi, page);
1364 offset = offset - em->start;
1365 btrfs_unplug_page(&BTRFS_I(inode)->root->fs_info->mapping_tree,
1366 em->block_start + offset, page);
1367 free_extent_map(em);
1371 * If this fails, caller must call bdi_destroy() to get rid of the
1374 static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi)
1378 bdi->name = "btrfs";
1379 bdi->capabilities = BDI_CAP_MAP_COPY;
1380 err = bdi_init(bdi);
1384 err = bdi_register(bdi, NULL, "btrfs-%d",
1385 atomic_inc_return(&btrfs_bdi_num));
1391 bdi->ra_pages = default_backing_dev_info.ra_pages;
1392 bdi->unplug_io_fn = btrfs_unplug_io_fn;
1393 bdi->unplug_io_data = info;
1394 bdi->congested_fn = btrfs_congested_fn;
1395 bdi->congested_data = info;
1399 static int bio_ready_for_csum(struct bio *bio)
1405 struct extent_io_tree *io_tree = NULL;
1406 struct btrfs_fs_info *info = NULL;
1407 struct bio_vec *bvec;
1411 bio_for_each_segment(bvec, bio, i) {
1412 page = bvec->bv_page;
1413 if (page->private == EXTENT_PAGE_PRIVATE) {
1414 length += bvec->bv_len;
1417 if (!page->private) {
1418 length += bvec->bv_len;
1421 length = bvec->bv_len;
1422 buf_len = page->private >> 2;
1423 start = page_offset(page) + bvec->bv_offset;
1424 io_tree = &BTRFS_I(page->mapping->host)->io_tree;
1425 info = BTRFS_I(page->mapping->host)->root->fs_info;
1427 /* are we fully contained in this bio? */
1428 if (buf_len <= length)
1431 ret = extent_range_uptodate(io_tree, start + length,
1432 start + buf_len - 1);
1437 * called by the kthread helper functions to finally call the bio end_io
1438 * functions. This is where read checksum verification actually happens
1440 static void end_workqueue_fn(struct btrfs_work *work)
1443 struct end_io_wq *end_io_wq;
1444 struct btrfs_fs_info *fs_info;
1447 end_io_wq = container_of(work, struct end_io_wq, work);
1448 bio = end_io_wq->bio;
1449 fs_info = end_io_wq->info;
1451 /* metadata bio reads are special because the whole tree block must
1452 * be checksummed at once. This makes sure the entire block is in
1453 * ram and up to date before trying to verify things. For
1454 * blocksize <= pagesize, it is basically a noop
1456 if (!(bio->bi_rw & (1 << BIO_RW)) && end_io_wq->metadata &&
1457 !bio_ready_for_csum(bio)) {
1458 btrfs_queue_worker(&fs_info->endio_meta_workers,
1462 error = end_io_wq->error;
1463 bio->bi_private = end_io_wq->private;
1464 bio->bi_end_io = end_io_wq->end_io;
1466 bio_endio(bio, error);
1469 static int cleaner_kthread(void *arg)
1471 struct btrfs_root *root = arg;
1475 if (root->fs_info->closing)
1478 vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE);
1480 if (!(root->fs_info->sb->s_flags & MS_RDONLY) &&
1481 mutex_trylock(&root->fs_info->cleaner_mutex)) {
1482 btrfs_run_delayed_iputs(root);
1483 btrfs_clean_old_snapshots(root);
1484 mutex_unlock(&root->fs_info->cleaner_mutex);
1487 if (freezing(current)) {
1491 if (root->fs_info->closing)
1493 set_current_state(TASK_INTERRUPTIBLE);
1495 __set_current_state(TASK_RUNNING);
1497 } while (!kthread_should_stop());
1501 static int transaction_kthread(void *arg)
1503 struct btrfs_root *root = arg;
1504 struct btrfs_trans_handle *trans;
1505 struct btrfs_transaction *cur;
1507 unsigned long delay;
1512 if (root->fs_info->closing)
1516 vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE);
1517 mutex_lock(&root->fs_info->transaction_kthread_mutex);
1519 mutex_lock(&root->fs_info->trans_mutex);
1520 cur = root->fs_info->running_transaction;
1522 mutex_unlock(&root->fs_info->trans_mutex);
1526 now = get_seconds();
1527 if (now < cur->start_time || now - cur->start_time < 30) {
1528 mutex_unlock(&root->fs_info->trans_mutex);
1532 mutex_unlock(&root->fs_info->trans_mutex);
1533 trans = btrfs_start_transaction(root, 1);
1534 ret = btrfs_commit_transaction(trans, root);
1537 wake_up_process(root->fs_info->cleaner_kthread);
1538 mutex_unlock(&root->fs_info->transaction_kthread_mutex);
1540 if (freezing(current)) {
1543 if (root->fs_info->closing)
1545 set_current_state(TASK_INTERRUPTIBLE);
1546 schedule_timeout(delay);
1547 __set_current_state(TASK_RUNNING);
1549 } while (!kthread_should_stop());
1553 struct btrfs_root *open_ctree(struct super_block *sb,
1554 struct btrfs_fs_devices *fs_devices,
1564 struct btrfs_key location;
1565 struct buffer_head *bh;
1566 struct btrfs_root *extent_root = kzalloc(sizeof(struct btrfs_root),
1568 struct btrfs_root *csum_root = kzalloc(sizeof(struct btrfs_root),
1570 struct btrfs_root *tree_root = kzalloc(sizeof(struct btrfs_root),
1572 struct btrfs_fs_info *fs_info = kzalloc(sizeof(*fs_info),
1574 struct btrfs_root *chunk_root = kzalloc(sizeof(struct btrfs_root),
1576 struct btrfs_root *dev_root = kzalloc(sizeof(struct btrfs_root),
1578 struct btrfs_root *log_tree_root;
1583 struct btrfs_super_block *disk_super;
1585 if (!extent_root || !tree_root || !fs_info ||
1586 !chunk_root || !dev_root || !csum_root) {
1591 ret = init_srcu_struct(&fs_info->subvol_srcu);
1597 ret = setup_bdi(fs_info, &fs_info->bdi);
1603 fs_info->btree_inode = new_inode(sb);
1604 if (!fs_info->btree_inode) {
1609 INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC);
1610 INIT_LIST_HEAD(&fs_info->trans_list);
1611 INIT_LIST_HEAD(&fs_info->dead_roots);
1612 INIT_LIST_HEAD(&fs_info->delayed_iputs);
1613 INIT_LIST_HEAD(&fs_info->hashers);
1614 INIT_LIST_HEAD(&fs_info->delalloc_inodes);
1615 INIT_LIST_HEAD(&fs_info->ordered_operations);
1616 INIT_LIST_HEAD(&fs_info->caching_block_groups);
1617 spin_lock_init(&fs_info->delalloc_lock);
1618 spin_lock_init(&fs_info->new_trans_lock);
1619 spin_lock_init(&fs_info->ref_cache_lock);
1620 spin_lock_init(&fs_info->fs_roots_radix_lock);
1621 spin_lock_init(&fs_info->delayed_iput_lock);
1623 init_completion(&fs_info->kobj_unregister);
1624 fs_info->tree_root = tree_root;
1625 fs_info->extent_root = extent_root;
1626 fs_info->csum_root = csum_root;
1627 fs_info->chunk_root = chunk_root;
1628 fs_info->dev_root = dev_root;
1629 fs_info->fs_devices = fs_devices;
1630 INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
1631 INIT_LIST_HEAD(&fs_info->space_info);
1632 btrfs_mapping_init(&fs_info->mapping_tree);
1633 atomic_set(&fs_info->nr_async_submits, 0);
1634 atomic_set(&fs_info->async_delalloc_pages, 0);
1635 atomic_set(&fs_info->async_submit_draining, 0);
1636 atomic_set(&fs_info->nr_async_bios, 0);
1638 fs_info->max_inline = 8192 * 1024;
1639 fs_info->metadata_ratio = 0;
1641 fs_info->thread_pool_size = min_t(unsigned long,
1642 num_online_cpus() + 2, 8);
1644 INIT_LIST_HEAD(&fs_info->ordered_extents);
1645 spin_lock_init(&fs_info->ordered_extent_lock);
1647 sb->s_blocksize = 4096;
1648 sb->s_blocksize_bits = blksize_bits(4096);
1649 sb->s_bdi = &fs_info->bdi;
1651 fs_info->btree_inode->i_ino = BTRFS_BTREE_INODE_OBJECTID;
1652 fs_info->btree_inode->i_nlink = 1;
1654 * we set the i_size on the btree inode to the max possible int.
1655 * the real end of the address space is determined by all of
1656 * the devices in the system
1658 fs_info->btree_inode->i_size = OFFSET_MAX;
1659 fs_info->btree_inode->i_mapping->a_ops = &btree_aops;
1660 fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi;
1662 RB_CLEAR_NODE(&BTRFS_I(fs_info->btree_inode)->rb_node);
1663 extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree,
1664 fs_info->btree_inode->i_mapping,
1666 extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree,
1669 BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops;
1671 BTRFS_I(fs_info->btree_inode)->root = tree_root;
1672 memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
1673 sizeof(struct btrfs_key));
1674 BTRFS_I(fs_info->btree_inode)->dummy_inode = 1;
1675 insert_inode_hash(fs_info->btree_inode);
1677 spin_lock_init(&fs_info->block_group_cache_lock);
1678 fs_info->block_group_cache_tree = RB_ROOT;
1680 extent_io_tree_init(&fs_info->freed_extents[0],
1681 fs_info->btree_inode->i_mapping, GFP_NOFS);
1682 extent_io_tree_init(&fs_info->freed_extents[1],
1683 fs_info->btree_inode->i_mapping, GFP_NOFS);
1684 fs_info->pinned_extents = &fs_info->freed_extents[0];
1685 fs_info->do_barriers = 1;
1688 mutex_init(&fs_info->trans_mutex);
1689 mutex_init(&fs_info->ordered_operations_mutex);
1690 mutex_init(&fs_info->tree_log_mutex);
1691 mutex_init(&fs_info->chunk_mutex);
1692 mutex_init(&fs_info->transaction_kthread_mutex);
1693 mutex_init(&fs_info->cleaner_mutex);
1694 mutex_init(&fs_info->volume_mutex);
1695 init_rwsem(&fs_info->extent_commit_sem);
1696 init_rwsem(&fs_info->cleanup_work_sem);
1697 init_rwsem(&fs_info->subvol_sem);
1699 btrfs_init_free_cluster(&fs_info->meta_alloc_cluster);
1700 btrfs_init_free_cluster(&fs_info->data_alloc_cluster);
1702 init_waitqueue_head(&fs_info->transaction_throttle);
1703 init_waitqueue_head(&fs_info->transaction_wait);
1704 init_waitqueue_head(&fs_info->async_submit_wait);
1706 __setup_root(4096, 4096, 4096, 4096, tree_root,
1707 fs_info, BTRFS_ROOT_TREE_OBJECTID);
1710 bh = btrfs_read_dev_super(fs_devices->latest_bdev);
1714 memcpy(&fs_info->super_copy, bh->b_data, sizeof(fs_info->super_copy));
1715 memcpy(&fs_info->super_for_commit, &fs_info->super_copy,
1716 sizeof(fs_info->super_for_commit));
1719 memcpy(fs_info->fsid, fs_info->super_copy.fsid, BTRFS_FSID_SIZE);
1721 disk_super = &fs_info->super_copy;
1722 if (!btrfs_super_root(disk_super))
1725 ret = btrfs_parse_options(tree_root, options);
1731 features = btrfs_super_incompat_flags(disk_super) &
1732 ~BTRFS_FEATURE_INCOMPAT_SUPP;
1734 printk(KERN_ERR "BTRFS: couldn't mount because of "
1735 "unsupported optional features (%Lx).\n",
1736 (unsigned long long)features);
1741 features = btrfs_super_incompat_flags(disk_super);
1742 if (!(features & BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF)) {
1743 features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
1744 btrfs_set_super_incompat_flags(disk_super, features);
1747 features = btrfs_super_compat_ro_flags(disk_super) &
1748 ~BTRFS_FEATURE_COMPAT_RO_SUPP;
1749 if (!(sb->s_flags & MS_RDONLY) && features) {
1750 printk(KERN_ERR "BTRFS: couldn't mount RDWR because of "
1751 "unsupported option features (%Lx).\n",
1752 (unsigned long long)features);
1757 btrfs_init_workers(&fs_info->generic_worker,
1758 "genwork", 1, NULL);
1760 btrfs_init_workers(&fs_info->workers, "worker",
1761 fs_info->thread_pool_size,
1762 &fs_info->generic_worker);
1764 btrfs_init_workers(&fs_info->delalloc_workers, "delalloc",
1765 fs_info->thread_pool_size,
1766 &fs_info->generic_worker);
1768 btrfs_init_workers(&fs_info->submit_workers, "submit",
1769 min_t(u64, fs_devices->num_devices,
1770 fs_info->thread_pool_size),
1771 &fs_info->generic_worker);
1772 btrfs_init_workers(&fs_info->enospc_workers, "enospc",
1773 fs_info->thread_pool_size,
1774 &fs_info->generic_worker);
1776 /* a higher idle thresh on the submit workers makes it much more
1777 * likely that bios will be send down in a sane order to the
1780 fs_info->submit_workers.idle_thresh = 64;
1782 fs_info->workers.idle_thresh = 16;
1783 fs_info->workers.ordered = 1;
1785 fs_info->delalloc_workers.idle_thresh = 2;
1786 fs_info->delalloc_workers.ordered = 1;
1788 btrfs_init_workers(&fs_info->fixup_workers, "fixup", 1,
1789 &fs_info->generic_worker);
1790 btrfs_init_workers(&fs_info->endio_workers, "endio",
1791 fs_info->thread_pool_size,
1792 &fs_info->generic_worker);
1793 btrfs_init_workers(&fs_info->endio_meta_workers, "endio-meta",
1794 fs_info->thread_pool_size,
1795 &fs_info->generic_worker);
1796 btrfs_init_workers(&fs_info->endio_meta_write_workers,
1797 "endio-meta-write", fs_info->thread_pool_size,
1798 &fs_info->generic_worker);
1799 btrfs_init_workers(&fs_info->endio_write_workers, "endio-write",
1800 fs_info->thread_pool_size,
1801 &fs_info->generic_worker);
1804 * endios are largely parallel and should have a very
1807 fs_info->endio_workers.idle_thresh = 4;
1808 fs_info->endio_meta_workers.idle_thresh = 4;
1810 fs_info->endio_write_workers.idle_thresh = 2;
1811 fs_info->endio_meta_write_workers.idle_thresh = 2;
1813 btrfs_start_workers(&fs_info->workers, 1);
1814 btrfs_start_workers(&fs_info->generic_worker, 1);
1815 btrfs_start_workers(&fs_info->submit_workers, 1);
1816 btrfs_start_workers(&fs_info->delalloc_workers, 1);
1817 btrfs_start_workers(&fs_info->fixup_workers, 1);
1818 btrfs_start_workers(&fs_info->endio_workers, 1);
1819 btrfs_start_workers(&fs_info->endio_meta_workers, 1);
1820 btrfs_start_workers(&fs_info->endio_meta_write_workers, 1);
1821 btrfs_start_workers(&fs_info->endio_write_workers, 1);
1822 btrfs_start_workers(&fs_info->enospc_workers, 1);
1824 fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super);
1825 fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages,
1826 4 * 1024 * 1024 / PAGE_CACHE_SIZE);
1828 nodesize = btrfs_super_nodesize(disk_super);
1829 leafsize = btrfs_super_leafsize(disk_super);
1830 sectorsize = btrfs_super_sectorsize(disk_super);
1831 stripesize = btrfs_super_stripesize(disk_super);
1832 tree_root->nodesize = nodesize;
1833 tree_root->leafsize = leafsize;
1834 tree_root->sectorsize = sectorsize;
1835 tree_root->stripesize = stripesize;
1837 sb->s_blocksize = sectorsize;
1838 sb->s_blocksize_bits = blksize_bits(sectorsize);
1840 if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
1841 sizeof(disk_super->magic))) {
1842 printk(KERN_INFO "btrfs: valid FS not found on %s\n", sb->s_id);
1843 goto fail_sb_buffer;
1846 mutex_lock(&fs_info->chunk_mutex);
1847 ret = btrfs_read_sys_array(tree_root);
1848 mutex_unlock(&fs_info->chunk_mutex);
1850 printk(KERN_WARNING "btrfs: failed to read the system "
1851 "array on %s\n", sb->s_id);
1852 goto fail_sb_buffer;
1855 blocksize = btrfs_level_size(tree_root,
1856 btrfs_super_chunk_root_level(disk_super));
1857 generation = btrfs_super_chunk_root_generation(disk_super);
1859 __setup_root(nodesize, leafsize, sectorsize, stripesize,
1860 chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
1862 chunk_root->node = read_tree_block(chunk_root,
1863 btrfs_super_chunk_root(disk_super),
1864 blocksize, generation);
1865 BUG_ON(!chunk_root->node);
1866 if (!test_bit(EXTENT_BUFFER_UPTODATE, &chunk_root->node->bflags)) {
1867 printk(KERN_WARNING "btrfs: failed to read chunk root on %s\n",
1869 goto fail_chunk_root;
1871 btrfs_set_root_node(&chunk_root->root_item, chunk_root->node);
1872 chunk_root->commit_root = btrfs_root_node(chunk_root);
1874 read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
1875 (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node),
1878 mutex_lock(&fs_info->chunk_mutex);
1879 ret = btrfs_read_chunk_tree(chunk_root);
1880 mutex_unlock(&fs_info->chunk_mutex);
1882 printk(KERN_WARNING "btrfs: failed to read chunk tree on %s\n",
1884 goto fail_chunk_root;
1887 btrfs_close_extra_devices(fs_devices);
1889 blocksize = btrfs_level_size(tree_root,
1890 btrfs_super_root_level(disk_super));
1891 generation = btrfs_super_generation(disk_super);
1893 tree_root->node = read_tree_block(tree_root,
1894 btrfs_super_root(disk_super),
1895 blocksize, generation);
1896 if (!tree_root->node)
1897 goto fail_chunk_root;
1898 if (!test_bit(EXTENT_BUFFER_UPTODATE, &tree_root->node->bflags)) {
1899 printk(KERN_WARNING "btrfs: failed to read tree root on %s\n",
1901 goto fail_tree_root;
1903 btrfs_set_root_node(&tree_root->root_item, tree_root->node);
1904 tree_root->commit_root = btrfs_root_node(tree_root);
1906 ret = find_and_setup_root(tree_root, fs_info,
1907 BTRFS_EXTENT_TREE_OBJECTID, extent_root);
1909 goto fail_tree_root;
1910 extent_root->track_dirty = 1;
1912 ret = find_and_setup_root(tree_root, fs_info,
1913 BTRFS_DEV_TREE_OBJECTID, dev_root);
1915 goto fail_extent_root;
1916 dev_root->track_dirty = 1;
1918 ret = find_and_setup_root(tree_root, fs_info,
1919 BTRFS_CSUM_TREE_OBJECTID, csum_root);
1923 csum_root->track_dirty = 1;
1925 ret = btrfs_read_block_groups(extent_root);
1927 printk(KERN_ERR "Failed to read block groups: %d\n", ret);
1928 goto fail_block_groups;
1931 fs_info->generation = generation;
1932 fs_info->last_trans_committed = generation;
1933 fs_info->data_alloc_profile = (u64)-1;
1934 fs_info->metadata_alloc_profile = (u64)-1;
1935 fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
1936 fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root,
1938 if (IS_ERR(fs_info->cleaner_kthread))
1939 goto fail_block_groups;
1941 fs_info->transaction_kthread = kthread_run(transaction_kthread,
1943 "btrfs-transaction");
1944 if (IS_ERR(fs_info->transaction_kthread))
1947 if (!btrfs_test_opt(tree_root, SSD) &&
1948 !btrfs_test_opt(tree_root, NOSSD) &&
1949 !fs_info->fs_devices->rotating) {
1950 printk(KERN_INFO "Btrfs detected SSD devices, enabling SSD "
1952 btrfs_set_opt(fs_info->mount_opt, SSD);
1955 if (btrfs_super_log_root(disk_super) != 0) {
1956 u64 bytenr = btrfs_super_log_root(disk_super);
1958 if (fs_devices->rw_devices == 0) {
1959 printk(KERN_WARNING "Btrfs log replay required "
1962 goto fail_trans_kthread;
1965 btrfs_level_size(tree_root,
1966 btrfs_super_log_root_level(disk_super));
1968 log_tree_root = kzalloc(sizeof(struct btrfs_root),
1971 __setup_root(nodesize, leafsize, sectorsize, stripesize,
1972 log_tree_root, fs_info, BTRFS_TREE_LOG_OBJECTID);
1974 log_tree_root->node = read_tree_block(tree_root, bytenr,
1977 ret = btrfs_recover_log_trees(log_tree_root);
1980 if (sb->s_flags & MS_RDONLY) {
1981 ret = btrfs_commit_super(tree_root);
1986 ret = btrfs_find_orphan_roots(tree_root);
1989 if (!(sb->s_flags & MS_RDONLY)) {
1990 ret = btrfs_recover_relocation(tree_root);
1993 "btrfs: failed to recover relocation\n");
1995 goto fail_trans_kthread;
1999 location.objectid = BTRFS_FS_TREE_OBJECTID;
2000 location.type = BTRFS_ROOT_ITEM_KEY;
2001 location.offset = (u64)-1;
2003 fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location);
2004 if (!fs_info->fs_root)
2005 goto fail_trans_kthread;
2007 if (!(sb->s_flags & MS_RDONLY)) {
2008 down_read(&fs_info->cleanup_work_sem);
2009 btrfs_orphan_cleanup(fs_info->fs_root);
2010 up_read(&fs_info->cleanup_work_sem);
2016 kthread_stop(fs_info->transaction_kthread);
2018 kthread_stop(fs_info->cleaner_kthread);
2021 * make sure we're done with the btree inode before we stop our
2024 filemap_write_and_wait(fs_info->btree_inode->i_mapping);
2025 invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
2028 btrfs_free_block_groups(fs_info);
2029 free_extent_buffer(csum_root->node);
2030 free_extent_buffer(csum_root->commit_root);
2032 free_extent_buffer(dev_root->node);
2033 free_extent_buffer(dev_root->commit_root);
2035 free_extent_buffer(extent_root->node);
2036 free_extent_buffer(extent_root->commit_root);
2038 free_extent_buffer(tree_root->node);
2039 free_extent_buffer(tree_root->commit_root);
2041 free_extent_buffer(chunk_root->node);
2042 free_extent_buffer(chunk_root->commit_root);
2044 btrfs_stop_workers(&fs_info->generic_worker);
2045 btrfs_stop_workers(&fs_info->fixup_workers);
2046 btrfs_stop_workers(&fs_info->delalloc_workers);
2047 btrfs_stop_workers(&fs_info->workers);
2048 btrfs_stop_workers(&fs_info->endio_workers);
2049 btrfs_stop_workers(&fs_info->endio_meta_workers);
2050 btrfs_stop_workers(&fs_info->endio_meta_write_workers);
2051 btrfs_stop_workers(&fs_info->endio_write_workers);
2052 btrfs_stop_workers(&fs_info->submit_workers);
2053 btrfs_stop_workers(&fs_info->enospc_workers);
2055 invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
2056 iput(fs_info->btree_inode);
2058 btrfs_close_devices(fs_info->fs_devices);
2059 btrfs_mapping_tree_free(&fs_info->mapping_tree);
2061 bdi_destroy(&fs_info->bdi);
2063 cleanup_srcu_struct(&fs_info->subvol_srcu);
2071 return ERR_PTR(err);
2074 static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate)
2076 char b[BDEVNAME_SIZE];
2079 set_buffer_uptodate(bh);
2081 if (!buffer_eopnotsupp(bh) && printk_ratelimit()) {
2082 printk(KERN_WARNING "lost page write due to "
2083 "I/O error on %s\n",
2084 bdevname(bh->b_bdev, b));
2086 /* note, we dont' set_buffer_write_io_error because we have
2087 * our own ways of dealing with the IO errors
2089 clear_buffer_uptodate(bh);
2095 struct buffer_head *btrfs_read_dev_super(struct block_device *bdev)
2097 struct buffer_head *bh;
2098 struct buffer_head *latest = NULL;
2099 struct btrfs_super_block *super;
2104 /* we would like to check all the supers, but that would make
2105 * a btrfs mount succeed after a mkfs from a different FS.
2106 * So, we need to add a special mount option to scan for
2107 * later supers, using BTRFS_SUPER_MIRROR_MAX instead
2109 for (i = 0; i < 1; i++) {
2110 bytenr = btrfs_sb_offset(i);
2111 if (bytenr + 4096 >= i_size_read(bdev->bd_inode))
2113 bh = __bread(bdev, bytenr / 4096, 4096);
2117 super = (struct btrfs_super_block *)bh->b_data;
2118 if (btrfs_super_bytenr(super) != bytenr ||
2119 strncmp((char *)(&super->magic), BTRFS_MAGIC,
2120 sizeof(super->magic))) {
2125 if (!latest || btrfs_super_generation(super) > transid) {
2128 transid = btrfs_super_generation(super);
2137 * this should be called twice, once with wait == 0 and
2138 * once with wait == 1. When wait == 0 is done, all the buffer heads
2139 * we write are pinned.
2141 * They are released when wait == 1 is done.
2142 * max_mirrors must be the same for both runs, and it indicates how
2143 * many supers on this one device should be written.
2145 * max_mirrors == 0 means to write them all.
2147 static int write_dev_supers(struct btrfs_device *device,
2148 struct btrfs_super_block *sb,
2149 int do_barriers, int wait, int max_mirrors)
2151 struct buffer_head *bh;
2157 int last_barrier = 0;
2159 if (max_mirrors == 0)
2160 max_mirrors = BTRFS_SUPER_MIRROR_MAX;
2162 /* make sure only the last submit_bh does a barrier */
2164 for (i = 0; i < max_mirrors; i++) {
2165 bytenr = btrfs_sb_offset(i);
2166 if (bytenr + BTRFS_SUPER_INFO_SIZE >=
2167 device->total_bytes)
2173 for (i = 0; i < max_mirrors; i++) {
2174 bytenr = btrfs_sb_offset(i);
2175 if (bytenr + BTRFS_SUPER_INFO_SIZE >= device->total_bytes)
2179 bh = __find_get_block(device->bdev, bytenr / 4096,
2180 BTRFS_SUPER_INFO_SIZE);
2183 if (!buffer_uptodate(bh))
2186 /* drop our reference */
2189 /* drop the reference from the wait == 0 run */
2193 btrfs_set_super_bytenr(sb, bytenr);
2196 crc = btrfs_csum_data(NULL, (char *)sb +
2197 BTRFS_CSUM_SIZE, crc,
2198 BTRFS_SUPER_INFO_SIZE -
2200 btrfs_csum_final(crc, sb->csum);
2203 * one reference for us, and we leave it for the
2206 bh = __getblk(device->bdev, bytenr / 4096,
2207 BTRFS_SUPER_INFO_SIZE);
2208 memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE);
2210 /* one reference for submit_bh */
2213 set_buffer_uptodate(bh);
2215 bh->b_end_io = btrfs_end_buffer_write_sync;
2218 if (i == last_barrier && do_barriers && device->barriers) {
2219 ret = submit_bh(WRITE_BARRIER, bh);
2220 if (ret == -EOPNOTSUPP) {
2221 printk("btrfs: disabling barriers on dev %s\n",
2223 set_buffer_uptodate(bh);
2224 device->barriers = 0;
2225 /* one reference for submit_bh */
2228 ret = submit_bh(WRITE_SYNC, bh);
2231 ret = submit_bh(WRITE_SYNC, bh);
2237 return errors < i ? 0 : -1;
2240 int write_all_supers(struct btrfs_root *root, int max_mirrors)
2242 struct list_head *head;
2243 struct btrfs_device *dev;
2244 struct btrfs_super_block *sb;
2245 struct btrfs_dev_item *dev_item;
2249 int total_errors = 0;
2252 max_errors = btrfs_super_num_devices(&root->fs_info->super_copy) - 1;
2253 do_barriers = !btrfs_test_opt(root, NOBARRIER);
2255 sb = &root->fs_info->super_for_commit;
2256 dev_item = &sb->dev_item;
2258 mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
2259 head = &root->fs_info->fs_devices->devices;
2260 list_for_each_entry(dev, head, dev_list) {
2265 if (!dev->in_fs_metadata || !dev->writeable)
2268 btrfs_set_stack_device_generation(dev_item, 0);
2269 btrfs_set_stack_device_type(dev_item, dev->type);
2270 btrfs_set_stack_device_id(dev_item, dev->devid);
2271 btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes);
2272 btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used);
2273 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
2274 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
2275 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
2276 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
2277 memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
2279 flags = btrfs_super_flags(sb);
2280 btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
2282 ret = write_dev_supers(dev, sb, do_barriers, 0, max_mirrors);
2286 if (total_errors > max_errors) {
2287 printk(KERN_ERR "btrfs: %d errors while writing supers\n",
2293 list_for_each_entry(dev, head, dev_list) {
2296 if (!dev->in_fs_metadata || !dev->writeable)
2299 ret = write_dev_supers(dev, sb, do_barriers, 1, max_mirrors);
2303 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
2304 if (total_errors > max_errors) {
2305 printk(KERN_ERR "btrfs: %d errors while writing supers\n",
2312 int write_ctree_super(struct btrfs_trans_handle *trans,
2313 struct btrfs_root *root, int max_mirrors)
2317 ret = write_all_supers(root, max_mirrors);
2321 int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
2323 spin_lock(&fs_info->fs_roots_radix_lock);
2324 radix_tree_delete(&fs_info->fs_roots_radix,
2325 (unsigned long)root->root_key.objectid);
2326 spin_unlock(&fs_info->fs_roots_radix_lock);
2328 if (btrfs_root_refs(&root->root_item) == 0)
2329 synchronize_srcu(&fs_info->subvol_srcu);
2335 static void free_fs_root(struct btrfs_root *root)
2337 WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree));
2338 if (root->anon_super.s_dev) {
2339 down_write(&root->anon_super.s_umount);
2340 kill_anon_super(&root->anon_super);
2342 free_extent_buffer(root->node);
2343 free_extent_buffer(root->commit_root);
2348 static int del_fs_roots(struct btrfs_fs_info *fs_info)
2351 struct btrfs_root *gang[8];
2354 while (!list_empty(&fs_info->dead_roots)) {
2355 gang[0] = list_entry(fs_info->dead_roots.next,
2356 struct btrfs_root, root_list);
2357 list_del(&gang[0]->root_list);
2359 if (gang[0]->in_radix) {
2360 btrfs_free_fs_root(fs_info, gang[0]);
2362 free_extent_buffer(gang[0]->node);
2363 free_extent_buffer(gang[0]->commit_root);
2369 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
2374 for (i = 0; i < ret; i++)
2375 btrfs_free_fs_root(fs_info, gang[i]);
2380 int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info)
2382 u64 root_objectid = 0;
2383 struct btrfs_root *gang[8];
2388 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
2389 (void **)gang, root_objectid,
2394 root_objectid = gang[ret - 1]->root_key.objectid + 1;
2395 for (i = 0; i < ret; i++) {
2396 root_objectid = gang[i]->root_key.objectid;
2397 btrfs_orphan_cleanup(gang[i]);
2404 int btrfs_commit_super(struct btrfs_root *root)
2406 struct btrfs_trans_handle *trans;
2409 mutex_lock(&root->fs_info->cleaner_mutex);
2410 btrfs_run_delayed_iputs(root);
2411 btrfs_clean_old_snapshots(root);
2412 mutex_unlock(&root->fs_info->cleaner_mutex);
2414 /* wait until ongoing cleanup work done */
2415 down_write(&root->fs_info->cleanup_work_sem);
2416 up_write(&root->fs_info->cleanup_work_sem);
2418 trans = btrfs_start_transaction(root, 1);
2419 ret = btrfs_commit_transaction(trans, root);
2421 /* run commit again to drop the original snapshot */
2422 trans = btrfs_start_transaction(root, 1);
2423 btrfs_commit_transaction(trans, root);
2424 ret = btrfs_write_and_wait_transaction(NULL, root);
2427 ret = write_ctree_super(NULL, root, 0);
2431 int close_ctree(struct btrfs_root *root)
2433 struct btrfs_fs_info *fs_info = root->fs_info;
2436 fs_info->closing = 1;
2439 kthread_stop(root->fs_info->transaction_kthread);
2440 kthread_stop(root->fs_info->cleaner_kthread);
2442 if (!(fs_info->sb->s_flags & MS_RDONLY)) {
2443 ret = btrfs_commit_super(root);
2445 printk(KERN_ERR "btrfs: commit super ret %d\n", ret);
2448 fs_info->closing = 2;
2451 if (fs_info->delalloc_bytes) {
2452 printk(KERN_INFO "btrfs: at unmount delalloc count %llu\n",
2453 (unsigned long long)fs_info->delalloc_bytes);
2455 if (fs_info->total_ref_cache_size) {
2456 printk(KERN_INFO "btrfs: at umount reference cache size %llu\n",
2457 (unsigned long long)fs_info->total_ref_cache_size);
2460 free_extent_buffer(fs_info->extent_root->node);
2461 free_extent_buffer(fs_info->extent_root->commit_root);
2462 free_extent_buffer(fs_info->tree_root->node);
2463 free_extent_buffer(fs_info->tree_root->commit_root);
2464 free_extent_buffer(root->fs_info->chunk_root->node);
2465 free_extent_buffer(root->fs_info->chunk_root->commit_root);
2466 free_extent_buffer(root->fs_info->dev_root->node);
2467 free_extent_buffer(root->fs_info->dev_root->commit_root);
2468 free_extent_buffer(root->fs_info->csum_root->node);
2469 free_extent_buffer(root->fs_info->csum_root->commit_root);
2471 btrfs_free_block_groups(root->fs_info);
2473 del_fs_roots(fs_info);
2475 iput(fs_info->btree_inode);
2477 btrfs_stop_workers(&fs_info->generic_worker);
2478 btrfs_stop_workers(&fs_info->fixup_workers);
2479 btrfs_stop_workers(&fs_info->delalloc_workers);
2480 btrfs_stop_workers(&fs_info->workers);
2481 btrfs_stop_workers(&fs_info->endio_workers);
2482 btrfs_stop_workers(&fs_info->endio_meta_workers);
2483 btrfs_stop_workers(&fs_info->endio_meta_write_workers);
2484 btrfs_stop_workers(&fs_info->endio_write_workers);
2485 btrfs_stop_workers(&fs_info->submit_workers);
2486 btrfs_stop_workers(&fs_info->enospc_workers);
2488 btrfs_close_devices(fs_info->fs_devices);
2489 btrfs_mapping_tree_free(&fs_info->mapping_tree);
2491 bdi_destroy(&fs_info->bdi);
2492 cleanup_srcu_struct(&fs_info->subvol_srcu);
2494 kfree(fs_info->extent_root);
2495 kfree(fs_info->tree_root);
2496 kfree(fs_info->chunk_root);
2497 kfree(fs_info->dev_root);
2498 kfree(fs_info->csum_root);
2502 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
2505 struct inode *btree_inode = buf->first_page->mapping->host;
2507 ret = extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, buf,
2512 ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf,
2517 int btrfs_set_buffer_uptodate(struct extent_buffer *buf)
2519 struct inode *btree_inode = buf->first_page->mapping->host;
2520 return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree,
2524 void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
2526 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
2527 u64 transid = btrfs_header_generation(buf);
2528 struct inode *btree_inode = root->fs_info->btree_inode;
2531 btrfs_assert_tree_locked(buf);
2532 if (transid != root->fs_info->generation) {
2533 printk(KERN_CRIT "btrfs transid mismatch buffer %llu, "
2534 "found %llu running %llu\n",
2535 (unsigned long long)buf->start,
2536 (unsigned long long)transid,
2537 (unsigned long long)root->fs_info->generation);
2540 was_dirty = set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree,
2543 spin_lock(&root->fs_info->delalloc_lock);
2544 root->fs_info->dirty_metadata_bytes += buf->len;
2545 spin_unlock(&root->fs_info->delalloc_lock);
2549 void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
2552 * looks as though older kernels can get into trouble with
2553 * this code, they end up stuck in balance_dirty_pages forever
2556 unsigned long thresh = 32 * 1024 * 1024;
2558 if (current->flags & PF_MEMALLOC)
2561 num_dirty = root->fs_info->dirty_metadata_bytes;
2563 if (num_dirty > thresh) {
2564 balance_dirty_pages_ratelimited_nr(
2565 root->fs_info->btree_inode->i_mapping, 1);
2570 int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid)
2572 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
2574 ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid);
2576 set_bit(EXTENT_BUFFER_UPTODATE, &buf->bflags);
2580 int btree_lock_page_hook(struct page *page)
2582 struct inode *inode = page->mapping->host;
2583 struct btrfs_root *root = BTRFS_I(inode)->root;
2584 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
2585 struct extent_buffer *eb;
2587 u64 bytenr = page_offset(page);
2589 if (page->private == EXTENT_PAGE_PRIVATE)
2592 len = page->private >> 2;
2593 eb = find_extent_buffer(io_tree, bytenr, len, GFP_NOFS);
2597 btrfs_tree_lock(eb);
2598 btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
2600 if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) {
2601 spin_lock(&root->fs_info->delalloc_lock);
2602 if (root->fs_info->dirty_metadata_bytes >= eb->len)
2603 root->fs_info->dirty_metadata_bytes -= eb->len;
2606 spin_unlock(&root->fs_info->delalloc_lock);
2609 btrfs_tree_unlock(eb);
2610 free_extent_buffer(eb);
2616 static struct extent_io_ops btree_extent_io_ops = {
2617 .write_cache_pages_lock_hook = btree_lock_page_hook,
2618 .readpage_end_io_hook = btree_readpage_end_io_hook,
2619 .submit_bio_hook = btree_submit_bio_hook,
2620 /* note we're sharing with inode.c for the merge bio hook */
2621 .merge_bio_hook = btrfs_merge_bio_hook,