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.
19 #include <linux/version.h>
21 #include <linux/blkdev.h>
22 #include <linux/scatterlist.h>
23 #include <linux/swap.h>
24 #include <linux/radix-tree.h>
25 #include <linux/writeback.h>
26 #include <linux/buffer_head.h> // for block_sync_page
27 #include <linux/workqueue.h>
28 #include <linux/kthread.h>
29 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20)
30 # include <linux/freezer.h>
32 # include <linux/sched.h>
37 #include "transaction.h"
38 #include "btrfs_inode.h"
40 #include "print-tree.h"
41 #include "async-thread.h"
45 static int check_tree_block(struct btrfs_root *root, struct extent_buffer *buf)
47 if (extent_buffer_blocknr(buf) != btrfs_header_blocknr(buf)) {
48 printk(KERN_CRIT "buf blocknr(buf) is %llu, header is %llu\n",
49 (unsigned long long)extent_buffer_blocknr(buf),
50 (unsigned long long)btrfs_header_blocknr(buf));
57 static struct extent_io_ops btree_extent_io_ops;
58 static void end_workqueue_fn(struct btrfs_work *work);
64 struct btrfs_fs_info *info;
67 struct list_head list;
68 struct btrfs_work work;
71 struct async_submit_bio {
74 struct list_head list;
75 extent_submit_bio_hook_t *submit_bio_hook;
78 struct btrfs_work work;
81 struct extent_map *btree_get_extent(struct inode *inode, struct page *page,
82 size_t page_offset, u64 start, u64 len,
85 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
86 struct extent_map *em;
89 spin_lock(&em_tree->lock);
90 em = lookup_extent_mapping(em_tree, start, len);
93 BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev;
94 spin_unlock(&em_tree->lock);
97 spin_unlock(&em_tree->lock);
99 em = alloc_extent_map(GFP_NOFS);
101 em = ERR_PTR(-ENOMEM);
107 em->bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev;
109 spin_lock(&em_tree->lock);
110 ret = add_extent_mapping(em_tree, em);
111 if (ret == -EEXIST) {
112 u64 failed_start = em->start;
113 u64 failed_len = em->len;
115 printk("failed to insert %Lu %Lu -> %Lu into tree\n",
116 em->start, em->len, em->block_start);
118 em = lookup_extent_mapping(em_tree, start, len);
120 printk("after failing, found %Lu %Lu %Lu\n",
121 em->start, em->len, em->block_start);
124 em = lookup_extent_mapping(em_tree, failed_start,
127 printk("double failure lookup gives us "
128 "%Lu %Lu -> %Lu\n", em->start,
129 em->len, em->block_start);
138 spin_unlock(&em_tree->lock);
146 u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len)
148 return btrfs_crc32c(seed, data, len);
151 void btrfs_csum_final(u32 crc, char *result)
153 *(__le32 *)result = ~cpu_to_le32(crc);
156 static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
159 char result[BTRFS_CRC32_SIZE];
161 unsigned long cur_len;
162 unsigned long offset = BTRFS_CSUM_SIZE;
163 char *map_token = NULL;
165 unsigned long map_start;
166 unsigned long map_len;
170 len = buf->len - offset;
172 err = map_private_extent_buffer(buf, offset, 32,
174 &map_start, &map_len, KM_USER0);
176 printk("failed to map extent buffer! %lu\n",
180 cur_len = min(len, map_len - (offset - map_start));
181 crc = btrfs_csum_data(root, kaddr + offset - map_start,
185 unmap_extent_buffer(buf, map_token, KM_USER0);
187 btrfs_csum_final(crc, result);
190 int from_this_trans = 0;
192 if (root->fs_info->running_transaction &&
193 btrfs_header_generation(buf) ==
194 root->fs_info->running_transaction->transid)
197 /* FIXME, this is not good */
198 if (memcmp_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE)) {
201 memcpy(&found, result, BTRFS_CRC32_SIZE);
203 read_extent_buffer(buf, &val, 0, BTRFS_CRC32_SIZE);
204 printk("btrfs: %s checksum verify failed on %llu "
205 "wanted %X found %X from_this_trans %d "
207 root->fs_info->sb->s_id,
208 buf->start, val, found, from_this_trans,
209 btrfs_header_level(buf));
213 write_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE);
218 static int verify_parent_transid(struct extent_io_tree *io_tree,
219 struct extent_buffer *eb, u64 parent_transid)
223 if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
226 lock_extent(io_tree, eb->start, eb->start + eb->len - 1, GFP_NOFS);
227 if (extent_buffer_uptodate(io_tree, eb) &&
228 btrfs_header_generation(eb) == parent_transid) {
232 printk("parent transid verify failed on %llu wanted %llu found %llu\n",
233 (unsigned long long)eb->start,
234 (unsigned long long)parent_transid,
235 (unsigned long long)btrfs_header_generation(eb));
238 clear_extent_buffer_uptodate(io_tree, eb);
239 unlock_extent(io_tree, eb->start, eb->start + eb->len - 1,
245 static int btree_read_extent_buffer_pages(struct btrfs_root *root,
246 struct extent_buffer *eb,
247 u64 start, u64 parent_transid)
249 struct extent_io_tree *io_tree;
254 io_tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree;
256 ret = read_extent_buffer_pages(io_tree, eb, start, 1,
257 btree_get_extent, mirror_num);
259 !verify_parent_transid(io_tree, eb, parent_transid))
262 num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
268 if (mirror_num > num_copies)
274 int csum_dirty_buffer(struct btrfs_root *root, struct page *page)
276 struct extent_io_tree *tree;
277 u64 start = (u64)page->index << PAGE_CACHE_SHIFT;
281 struct extent_buffer *eb;
284 tree = &BTRFS_I(page->mapping->host)->io_tree;
286 if (page->private == EXTENT_PAGE_PRIVATE)
290 len = page->private >> 2;
294 eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS);
295 ret = btree_read_extent_buffer_pages(root, eb, start + PAGE_CACHE_SIZE,
296 btrfs_header_generation(eb));
298 found_start = btrfs_header_bytenr(eb);
299 if (found_start != start) {
300 printk("warning: eb start incorrect %Lu buffer %Lu len %lu\n",
301 start, found_start, len);
305 if (eb->first_page != page) {
306 printk("bad first page %lu %lu\n", eb->first_page->index,
311 if (!PageUptodate(page)) {
312 printk("csum not up to date page %lu\n", page->index);
316 found_level = btrfs_header_level(eb);
317 spin_lock(&root->fs_info->hash_lock);
318 btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
319 spin_unlock(&root->fs_info->hash_lock);
320 csum_tree_block(root, eb, 0);
322 free_extent_buffer(eb);
327 static int btree_writepage_io_hook(struct page *page, u64 start, u64 end)
329 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
331 csum_dirty_buffer(root, page);
335 int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end,
336 struct extent_state *state)
338 struct extent_io_tree *tree;
342 struct extent_buffer *eb;
343 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
346 tree = &BTRFS_I(page->mapping->host)->io_tree;
347 if (page->private == EXTENT_PAGE_PRIVATE)
351 len = page->private >> 2;
355 eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS);
357 found_start = btrfs_header_bytenr(eb);
358 if (found_start != start) {
362 if (eb->first_page != page) {
363 printk("bad first page %lu %lu\n", eb->first_page->index,
369 if (memcmp_extent_buffer(eb, root->fs_info->fsid,
370 (unsigned long)btrfs_header_fsid(eb),
372 printk("bad fsid on block %Lu\n", eb->start);
376 found_level = btrfs_header_level(eb);
378 ret = csum_tree_block(root, eb, 1);
382 end = min_t(u64, eb->len, PAGE_CACHE_SIZE);
383 end = eb->start + end - 1;
384 release_extent_buffer_tail_pages(eb);
386 free_extent_buffer(eb);
391 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
392 static void end_workqueue_bio(struct bio *bio, int err)
394 static int end_workqueue_bio(struct bio *bio,
395 unsigned int bytes_done, int err)
398 struct end_io_wq *end_io_wq = bio->bi_private;
399 struct btrfs_fs_info *fs_info;
401 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
406 fs_info = end_io_wq->info;
407 end_io_wq->error = err;
408 end_io_wq->work.func = end_workqueue_fn;
409 end_io_wq->work.flags = 0;
410 if (bio->bi_rw & (1 << BIO_RW))
411 btrfs_queue_worker(&fs_info->endio_write_workers,
414 btrfs_queue_worker(&fs_info->endio_workers, &end_io_wq->work);
416 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
421 int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
424 struct end_io_wq *end_io_wq;
425 end_io_wq = kmalloc(sizeof(*end_io_wq), GFP_NOFS);
429 end_io_wq->private = bio->bi_private;
430 end_io_wq->end_io = bio->bi_end_io;
431 end_io_wq->info = info;
432 end_io_wq->error = 0;
433 end_io_wq->bio = bio;
434 end_io_wq->metadata = metadata;
436 bio->bi_private = end_io_wq;
437 bio->bi_end_io = end_workqueue_bio;
441 static void run_one_async_submit(struct btrfs_work *work)
443 struct btrfs_fs_info *fs_info;
444 struct async_submit_bio *async;
446 async = container_of(work, struct async_submit_bio, work);
447 fs_info = BTRFS_I(async->inode)->root->fs_info;
448 atomic_dec(&fs_info->nr_async_submits);
449 async->submit_bio_hook(async->inode, async->rw, async->bio,
454 int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
455 int rw, struct bio *bio, int mirror_num,
456 extent_submit_bio_hook_t *submit_bio_hook)
458 struct async_submit_bio *async;
460 async = kmalloc(sizeof(*async), GFP_NOFS);
464 async->inode = inode;
467 async->mirror_num = mirror_num;
468 async->submit_bio_hook = submit_bio_hook;
469 async->work.func = run_one_async_submit;
470 async->work.flags = 0;
471 atomic_inc(&fs_info->nr_async_submits);
472 btrfs_queue_worker(&fs_info->workers, &async->work);
476 static int __btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
479 struct btrfs_root *root = BTRFS_I(inode)->root;
483 offset = bio->bi_sector << 9;
486 * when we're called for a write, we're already in the async
487 * submission context. Just jump ingo btrfs_map_bio
489 if (rw & (1 << BIO_RW)) {
490 return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio,
495 * called for a read, do the setup so that checksum validation
496 * can happen in the async kernel threads
498 ret = btrfs_bio_wq_end_io(root->fs_info, bio, 1);
501 return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num, 1);
504 static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
508 * kthread helpers are used to submit writes so that checksumming
509 * can happen in parallel across all CPUs
511 if (!(rw & (1 << BIO_RW))) {
512 return __btree_submit_bio_hook(inode, rw, bio, mirror_num);
514 return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info,
515 inode, rw, bio, mirror_num,
516 __btree_submit_bio_hook);
519 static int btree_writepage(struct page *page, struct writeback_control *wbc)
521 struct extent_io_tree *tree;
522 tree = &BTRFS_I(page->mapping->host)->io_tree;
523 return extent_write_full_page(tree, page, btree_get_extent, wbc);
526 static int btree_writepages(struct address_space *mapping,
527 struct writeback_control *wbc)
529 struct extent_io_tree *tree;
530 tree = &BTRFS_I(mapping->host)->io_tree;
531 if (wbc->sync_mode == WB_SYNC_NONE) {
534 unsigned long thresh = 96 * 1024 * 1024;
536 if (wbc->for_kupdate)
539 if (current_is_pdflush()) {
540 thresh = 96 * 1024 * 1024;
542 thresh = 8 * 1024 * 1024;
544 num_dirty = count_range_bits(tree, &start, (u64)-1,
545 thresh, EXTENT_DIRTY);
546 if (num_dirty < thresh) {
550 return extent_writepages(tree, mapping, btree_get_extent, wbc);
553 int btree_readpage(struct file *file, struct page *page)
555 struct extent_io_tree *tree;
556 tree = &BTRFS_I(page->mapping->host)->io_tree;
557 return extent_read_full_page(tree, page, btree_get_extent);
560 static int btree_releasepage(struct page *page, gfp_t gfp_flags)
562 struct extent_io_tree *tree;
563 struct extent_map_tree *map;
566 if (page_count(page) > 3) {
567 /* once for page->private, once for the caller, once
568 * once for the page cache
572 tree = &BTRFS_I(page->mapping->host)->io_tree;
573 map = &BTRFS_I(page->mapping->host)->extent_tree;
574 ret = try_release_extent_state(map, tree, page, gfp_flags);
576 invalidate_extent_lru(tree, page_offset(page), PAGE_CACHE_SIZE);
577 ClearPagePrivate(page);
578 set_page_private(page, 0);
579 page_cache_release(page);
584 static void btree_invalidatepage(struct page *page, unsigned long offset)
586 struct extent_io_tree *tree;
587 tree = &BTRFS_I(page->mapping->host)->io_tree;
588 extent_invalidatepage(tree, page, offset);
589 btree_releasepage(page, GFP_NOFS);
590 if (PagePrivate(page)) {
591 invalidate_extent_lru(tree, page_offset(page), PAGE_CACHE_SIZE);
592 ClearPagePrivate(page);
593 set_page_private(page, 0);
594 page_cache_release(page);
599 static int btree_writepage(struct page *page, struct writeback_control *wbc)
601 struct buffer_head *bh;
602 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
603 struct buffer_head *head;
604 if (!page_has_buffers(page)) {
605 create_empty_buffers(page, root->fs_info->sb->s_blocksize,
606 (1 << BH_Dirty)|(1 << BH_Uptodate));
608 head = page_buffers(page);
611 if (buffer_dirty(bh))
612 csum_tree_block(root, bh, 0);
613 bh = bh->b_this_page;
614 } while (bh != head);
615 return block_write_full_page(page, btree_get_block, wbc);
619 static struct address_space_operations btree_aops = {
620 .readpage = btree_readpage,
621 .writepage = btree_writepage,
622 .writepages = btree_writepages,
623 .releasepage = btree_releasepage,
624 .invalidatepage = btree_invalidatepage,
625 .sync_page = block_sync_page,
628 int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
631 struct extent_buffer *buf = NULL;
632 struct inode *btree_inode = root->fs_info->btree_inode;
635 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
638 read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree,
639 buf, 0, 0, btree_get_extent, 0);
640 free_extent_buffer(buf);
644 struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
645 u64 bytenr, u32 blocksize)
647 struct inode *btree_inode = root->fs_info->btree_inode;
648 struct extent_buffer *eb;
649 eb = find_extent_buffer(&BTRFS_I(btree_inode)->io_tree,
650 bytenr, blocksize, GFP_NOFS);
654 struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
655 u64 bytenr, u32 blocksize)
657 struct inode *btree_inode = root->fs_info->btree_inode;
658 struct extent_buffer *eb;
660 eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->io_tree,
661 bytenr, blocksize, NULL, GFP_NOFS);
666 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
667 u32 blocksize, u64 parent_transid)
669 struct extent_buffer *buf = NULL;
670 struct inode *btree_inode = root->fs_info->btree_inode;
671 struct extent_io_tree *io_tree;
674 io_tree = &BTRFS_I(btree_inode)->io_tree;
676 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
680 ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid);
683 buf->flags |= EXTENT_UPTODATE;
689 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
690 struct extent_buffer *buf)
692 struct inode *btree_inode = root->fs_info->btree_inode;
693 if (btrfs_header_generation(buf) ==
694 root->fs_info->running_transaction->transid) {
695 WARN_ON(!btrfs_tree_locked(buf));
696 clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree,
702 int wait_on_tree_block_writeback(struct btrfs_root *root,
703 struct extent_buffer *buf)
705 struct inode *btree_inode = root->fs_info->btree_inode;
706 wait_on_extent_buffer_writeback(&BTRFS_I(btree_inode)->io_tree,
711 static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
712 u32 stripesize, struct btrfs_root *root,
713 struct btrfs_fs_info *fs_info,
718 root->commit_root = NULL;
719 root->sectorsize = sectorsize;
720 root->nodesize = nodesize;
721 root->leafsize = leafsize;
722 root->stripesize = stripesize;
724 root->track_dirty = 0;
726 root->fs_info = fs_info;
727 root->objectid = objectid;
728 root->last_trans = 0;
729 root->highest_inode = 0;
730 root->last_inode_alloc = 0;
734 INIT_LIST_HEAD(&root->dirty_list);
735 spin_lock_init(&root->node_lock);
736 mutex_init(&root->objectid_mutex);
737 memset(&root->root_key, 0, sizeof(root->root_key));
738 memset(&root->root_item, 0, sizeof(root->root_item));
739 memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
740 memset(&root->root_kobj, 0, sizeof(root->root_kobj));
741 root->defrag_trans_start = fs_info->generation;
742 init_completion(&root->kobj_unregister);
743 root->defrag_running = 0;
744 root->defrag_level = 0;
745 root->root_key.objectid = objectid;
749 static int find_and_setup_root(struct btrfs_root *tree_root,
750 struct btrfs_fs_info *fs_info,
752 struct btrfs_root *root)
757 __setup_root(tree_root->nodesize, tree_root->leafsize,
758 tree_root->sectorsize, tree_root->stripesize,
759 root, fs_info, objectid);
760 ret = btrfs_find_last_root(tree_root, objectid,
761 &root->root_item, &root->root_key);
764 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
765 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
771 struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_fs_info *fs_info,
772 struct btrfs_key *location)
774 struct btrfs_root *root;
775 struct btrfs_root *tree_root = fs_info->tree_root;
776 struct btrfs_path *path;
777 struct extent_buffer *l;
782 root = kzalloc(sizeof(*root), GFP_NOFS);
784 return ERR_PTR(-ENOMEM);
785 if (location->offset == (u64)-1) {
786 ret = find_and_setup_root(tree_root, fs_info,
787 location->objectid, root);
795 __setup_root(tree_root->nodesize, tree_root->leafsize,
796 tree_root->sectorsize, tree_root->stripesize,
797 root, fs_info, location->objectid);
799 path = btrfs_alloc_path();
801 ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
808 read_extent_buffer(l, &root->root_item,
809 btrfs_item_ptr_offset(l, path->slots[0]),
810 sizeof(root->root_item));
811 memcpy(&root->root_key, location, sizeof(*location));
814 btrfs_release_path(root, path);
815 btrfs_free_path(path);
820 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
821 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
826 ret = btrfs_find_highest_inode(root, &highest_inode);
828 root->highest_inode = highest_inode;
829 root->last_inode_alloc = highest_inode;
834 struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
837 struct btrfs_root *root;
839 if (root_objectid == BTRFS_ROOT_TREE_OBJECTID)
840 return fs_info->tree_root;
841 if (root_objectid == BTRFS_EXTENT_TREE_OBJECTID)
842 return fs_info->extent_root;
844 root = radix_tree_lookup(&fs_info->fs_roots_radix,
845 (unsigned long)root_objectid);
849 struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
850 struct btrfs_key *location)
852 struct btrfs_root *root;
855 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
856 return fs_info->tree_root;
857 if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
858 return fs_info->extent_root;
859 if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
860 return fs_info->chunk_root;
861 if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
862 return fs_info->dev_root;
864 root = radix_tree_lookup(&fs_info->fs_roots_radix,
865 (unsigned long)location->objectid);
869 root = btrfs_read_fs_root_no_radix(fs_info, location);
872 ret = radix_tree_insert(&fs_info->fs_roots_radix,
873 (unsigned long)root->root_key.objectid,
876 free_extent_buffer(root->node);
880 ret = btrfs_find_dead_roots(fs_info->tree_root,
881 root->root_key.objectid, root);
887 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
888 struct btrfs_key *location,
889 const char *name, int namelen)
891 struct btrfs_root *root;
894 root = btrfs_read_fs_root_no_name(fs_info, location);
901 ret = btrfs_set_root_name(root, name, namelen);
903 free_extent_buffer(root->node);
908 ret = btrfs_sysfs_add_root(root);
910 free_extent_buffer(root->node);
919 static int add_hasher(struct btrfs_fs_info *info, char *type) {
920 struct btrfs_hasher *hasher;
922 hasher = kmalloc(sizeof(*hasher), GFP_NOFS);
925 hasher->hash_tfm = crypto_alloc_hash(type, 0, CRYPTO_ALG_ASYNC);
926 if (!hasher->hash_tfm) {
930 spin_lock(&info->hash_lock);
931 list_add(&hasher->list, &info->hashers);
932 spin_unlock(&info->hash_lock);
937 static int btrfs_congested_fn(void *congested_data, int bdi_bits)
939 struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data;
941 int limit = 256 * info->fs_devices->open_devices;
942 struct list_head *cur;
943 struct btrfs_device *device;
944 struct backing_dev_info *bdi;
946 if ((bdi_bits & (1 << BDI_write_congested)) &&
947 atomic_read(&info->nr_async_submits) > limit) {
951 list_for_each(cur, &info->fs_devices->devices) {
952 device = list_entry(cur, struct btrfs_device, dev_list);
955 bdi = blk_get_backing_dev_info(device->bdev);
956 if (bdi && bdi_congested(bdi, bdi_bits)) {
965 * this unplugs every device on the box, and it is only used when page
968 static void __unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
970 struct list_head *cur;
971 struct btrfs_device *device;
972 struct btrfs_fs_info *info;
974 info = (struct btrfs_fs_info *)bdi->unplug_io_data;
975 list_for_each(cur, &info->fs_devices->devices) {
976 device = list_entry(cur, struct btrfs_device, dev_list);
977 bdi = blk_get_backing_dev_info(device->bdev);
978 if (bdi->unplug_io_fn) {
979 bdi->unplug_io_fn(bdi, page);
984 void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
987 struct extent_map_tree *em_tree;
988 struct extent_map *em;
989 struct address_space *mapping;
992 /* the generic O_DIRECT read code does this */
994 __unplug_io_fn(bdi, page);
999 * page->mapping may change at any time. Get a consistent copy
1000 * and use that for everything below
1003 mapping = page->mapping;
1007 inode = mapping->host;
1008 offset = page_offset(page);
1010 em_tree = &BTRFS_I(inode)->extent_tree;
1011 spin_lock(&em_tree->lock);
1012 em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);
1013 spin_unlock(&em_tree->lock);
1017 offset = offset - em->start;
1018 btrfs_unplug_page(&BTRFS_I(inode)->root->fs_info->mapping_tree,
1019 em->block_start + offset, page);
1020 free_extent_map(em);
1023 static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi)
1025 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
1028 bdi->ra_pages = default_backing_dev_info.ra_pages;
1030 bdi->capabilities = default_backing_dev_info.capabilities;
1031 bdi->unplug_io_fn = btrfs_unplug_io_fn;
1032 bdi->unplug_io_data = info;
1033 bdi->congested_fn = btrfs_congested_fn;
1034 bdi->congested_data = info;
1038 static int bio_ready_for_csum(struct bio *bio)
1044 struct extent_io_tree *io_tree = NULL;
1045 struct btrfs_fs_info *info = NULL;
1046 struct bio_vec *bvec;
1050 bio_for_each_segment(bvec, bio, i) {
1051 page = bvec->bv_page;
1052 if (page->private == EXTENT_PAGE_PRIVATE) {
1053 length += bvec->bv_len;
1056 if (!page->private) {
1057 length += bvec->bv_len;
1060 length = bvec->bv_len;
1061 buf_len = page->private >> 2;
1062 start = page_offset(page) + bvec->bv_offset;
1063 io_tree = &BTRFS_I(page->mapping->host)->io_tree;
1064 info = BTRFS_I(page->mapping->host)->root->fs_info;
1066 /* are we fully contained in this bio? */
1067 if (buf_len <= length)
1070 ret = extent_range_uptodate(io_tree, start + length,
1071 start + buf_len - 1);
1078 * called by the kthread helper functions to finally call the bio end_io
1079 * functions. This is where read checksum verification actually happens
1081 static void end_workqueue_fn(struct btrfs_work *work)
1084 struct end_io_wq *end_io_wq;
1085 struct btrfs_fs_info *fs_info;
1088 end_io_wq = container_of(work, struct end_io_wq, work);
1089 bio = end_io_wq->bio;
1090 fs_info = end_io_wq->info;
1092 /* metadata bios are special because the whole tree block must
1093 * be checksummed at once. This makes sure the entire block is in
1094 * ram and up to date before trying to verify things. For
1095 * blocksize <= pagesize, it is basically a noop
1097 if (end_io_wq->metadata && !bio_ready_for_csum(bio)) {
1098 btrfs_queue_worker(&fs_info->endio_workers,
1102 error = end_io_wq->error;
1103 bio->bi_private = end_io_wq->private;
1104 bio->bi_end_io = end_io_wq->end_io;
1106 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
1107 bio_endio(bio, bio->bi_size, error);
1109 bio_endio(bio, error);
1113 static int cleaner_kthread(void *arg)
1115 struct btrfs_root *root = arg;
1119 if (root->fs_info->closing)
1122 vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE);
1123 mutex_lock(&root->fs_info->cleaner_mutex);
1124 btrfs_clean_old_snapshots(root);
1125 mutex_unlock(&root->fs_info->cleaner_mutex);
1127 if (freezing(current)) {
1131 if (root->fs_info->closing)
1133 set_current_state(TASK_INTERRUPTIBLE);
1135 __set_current_state(TASK_RUNNING);
1137 } while (!kthread_should_stop());
1141 static int transaction_kthread(void *arg)
1143 struct btrfs_root *root = arg;
1144 struct btrfs_trans_handle *trans;
1145 struct btrfs_transaction *cur;
1147 unsigned long delay;
1152 if (root->fs_info->closing)
1156 vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE);
1157 mutex_lock(&root->fs_info->transaction_kthread_mutex);
1159 mutex_lock(&root->fs_info->trans_mutex);
1160 cur = root->fs_info->running_transaction;
1162 mutex_unlock(&root->fs_info->trans_mutex);
1165 now = get_seconds();
1166 if (now < cur->start_time || now - cur->start_time < 30) {
1167 mutex_unlock(&root->fs_info->trans_mutex);
1171 mutex_unlock(&root->fs_info->trans_mutex);
1172 trans = btrfs_start_transaction(root, 1);
1173 ret = btrfs_commit_transaction(trans, root);
1175 wake_up_process(root->fs_info->cleaner_kthread);
1176 mutex_unlock(&root->fs_info->transaction_kthread_mutex);
1178 if (freezing(current)) {
1181 if (root->fs_info->closing)
1183 set_current_state(TASK_INTERRUPTIBLE);
1184 schedule_timeout(delay);
1185 __set_current_state(TASK_RUNNING);
1187 } while (!kthread_should_stop());
1191 struct btrfs_root *open_ctree(struct super_block *sb,
1192 struct btrfs_fs_devices *fs_devices,
1200 struct buffer_head *bh;
1201 struct btrfs_root *extent_root = kmalloc(sizeof(struct btrfs_root),
1203 struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root),
1205 struct btrfs_fs_info *fs_info = kzalloc(sizeof(*fs_info),
1207 struct btrfs_root *chunk_root = kmalloc(sizeof(struct btrfs_root),
1209 struct btrfs_root *dev_root = kmalloc(sizeof(struct btrfs_root),
1214 struct btrfs_super_block *disk_super;
1216 if (!extent_root || !tree_root || !fs_info) {
1220 INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_NOFS);
1221 INIT_LIST_HEAD(&fs_info->trans_list);
1222 INIT_LIST_HEAD(&fs_info->dead_roots);
1223 INIT_LIST_HEAD(&fs_info->hashers);
1224 spin_lock_init(&fs_info->hash_lock);
1225 spin_lock_init(&fs_info->delalloc_lock);
1226 spin_lock_init(&fs_info->new_trans_lock);
1228 init_completion(&fs_info->kobj_unregister);
1229 fs_info->tree_root = tree_root;
1230 fs_info->extent_root = extent_root;
1231 fs_info->chunk_root = chunk_root;
1232 fs_info->dev_root = dev_root;
1233 fs_info->fs_devices = fs_devices;
1234 INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
1235 INIT_LIST_HEAD(&fs_info->space_info);
1236 btrfs_mapping_init(&fs_info->mapping_tree);
1237 atomic_set(&fs_info->nr_async_submits, 0);
1238 atomic_set(&fs_info->throttles, 0);
1240 fs_info->max_extent = (u64)-1;
1241 fs_info->max_inline = 8192 * 1024;
1242 setup_bdi(fs_info, &fs_info->bdi);
1243 fs_info->btree_inode = new_inode(sb);
1244 fs_info->btree_inode->i_ino = 1;
1245 fs_info->btree_inode->i_nlink = 1;
1246 fs_info->thread_pool_size = min(num_online_cpus() + 2, 8);
1248 sb->s_blocksize = 4096;
1249 sb->s_blocksize_bits = blksize_bits(4096);
1252 * we set the i_size on the btree inode to the max possible int.
1253 * the real end of the address space is determined by all of
1254 * the devices in the system
1256 fs_info->btree_inode->i_size = OFFSET_MAX;
1257 fs_info->btree_inode->i_mapping->a_ops = &btree_aops;
1258 fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi;
1260 extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree,
1261 fs_info->btree_inode->i_mapping,
1263 extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree,
1266 BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops;
1268 extent_io_tree_init(&fs_info->free_space_cache,
1269 fs_info->btree_inode->i_mapping, GFP_NOFS);
1270 extent_io_tree_init(&fs_info->block_group_cache,
1271 fs_info->btree_inode->i_mapping, GFP_NOFS);
1272 extent_io_tree_init(&fs_info->pinned_extents,
1273 fs_info->btree_inode->i_mapping, GFP_NOFS);
1274 extent_io_tree_init(&fs_info->pending_del,
1275 fs_info->btree_inode->i_mapping, GFP_NOFS);
1276 extent_io_tree_init(&fs_info->extent_ins,
1277 fs_info->btree_inode->i_mapping, GFP_NOFS);
1278 fs_info->do_barriers = 1;
1280 BTRFS_I(fs_info->btree_inode)->root = tree_root;
1281 memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
1282 sizeof(struct btrfs_key));
1283 insert_inode_hash(fs_info->btree_inode);
1284 mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
1286 mutex_init(&fs_info->trans_mutex);
1287 mutex_init(&fs_info->drop_mutex);
1288 mutex_init(&fs_info->alloc_mutex);
1289 mutex_init(&fs_info->chunk_mutex);
1290 mutex_init(&fs_info->transaction_kthread_mutex);
1291 mutex_init(&fs_info->cleaner_mutex);
1292 mutex_init(&fs_info->volume_mutex);
1293 init_waitqueue_head(&fs_info->transaction_throttle);
1296 ret = add_hasher(fs_info, "crc32c");
1298 printk("btrfs: failed hash setup, modprobe cryptomgr?\n");
1303 __setup_root(4096, 4096, 4096, 4096, tree_root,
1304 fs_info, BTRFS_ROOT_TREE_OBJECTID);
1307 bh = __bread(fs_devices->latest_bdev,
1308 BTRFS_SUPER_INFO_OFFSET / 4096, 4096);
1312 memcpy(&fs_info->super_copy, bh->b_data, sizeof(fs_info->super_copy));
1315 memcpy(fs_info->fsid, fs_info->super_copy.fsid, BTRFS_FSID_SIZE);
1317 disk_super = &fs_info->super_copy;
1318 if (!btrfs_super_root(disk_super))
1319 goto fail_sb_buffer;
1321 err = btrfs_parse_options(tree_root, options);
1323 goto fail_sb_buffer;
1326 * we need to start all the end_io workers up front because the
1327 * queue work function gets called at interrupt time, and so it
1328 * cannot dynamically grow.
1330 btrfs_init_workers(&fs_info->workers, fs_info->thread_pool_size);
1331 btrfs_init_workers(&fs_info->submit_workers, fs_info->thread_pool_size);
1332 btrfs_init_workers(&fs_info->fixup_workers, 1);
1333 btrfs_init_workers(&fs_info->endio_workers, fs_info->thread_pool_size);
1334 btrfs_init_workers(&fs_info->endio_write_workers,
1335 fs_info->thread_pool_size);
1336 btrfs_start_workers(&fs_info->workers, 1);
1337 btrfs_start_workers(&fs_info->submit_workers, 1);
1338 btrfs_start_workers(&fs_info->fixup_workers, 1);
1339 btrfs_start_workers(&fs_info->endio_workers, fs_info->thread_pool_size);
1340 btrfs_start_workers(&fs_info->endio_write_workers,
1341 fs_info->thread_pool_size);
1344 if (btrfs_super_num_devices(disk_super) > fs_devices->open_devices) {
1345 printk("Btrfs: wanted %llu devices, but found %llu\n",
1346 (unsigned long long)btrfs_super_num_devices(disk_super),
1347 (unsigned long long)fs_devices->open_devices);
1348 if (btrfs_test_opt(tree_root, DEGRADED))
1349 printk("continuing in degraded mode\n");
1351 goto fail_sb_buffer;
1355 fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super);
1357 nodesize = btrfs_super_nodesize(disk_super);
1358 leafsize = btrfs_super_leafsize(disk_super);
1359 sectorsize = btrfs_super_sectorsize(disk_super);
1360 stripesize = btrfs_super_stripesize(disk_super);
1361 tree_root->nodesize = nodesize;
1362 tree_root->leafsize = leafsize;
1363 tree_root->sectorsize = sectorsize;
1364 tree_root->stripesize = stripesize;
1366 sb->s_blocksize = sectorsize;
1367 sb->s_blocksize_bits = blksize_bits(sectorsize);
1369 if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
1370 sizeof(disk_super->magic))) {
1371 printk("btrfs: valid FS not found on %s\n", sb->s_id);
1372 goto fail_sb_buffer;
1375 mutex_lock(&fs_info->chunk_mutex);
1376 ret = btrfs_read_sys_array(tree_root);
1377 mutex_unlock(&fs_info->chunk_mutex);
1379 printk("btrfs: failed to read the system array on %s\n",
1381 goto fail_sys_array;
1384 blocksize = btrfs_level_size(tree_root,
1385 btrfs_super_chunk_root_level(disk_super));
1387 __setup_root(nodesize, leafsize, sectorsize, stripesize,
1388 chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
1390 chunk_root->node = read_tree_block(chunk_root,
1391 btrfs_super_chunk_root(disk_super),
1393 BUG_ON(!chunk_root->node);
1395 read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
1396 (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node),
1399 mutex_lock(&fs_info->chunk_mutex);
1400 ret = btrfs_read_chunk_tree(chunk_root);
1401 mutex_unlock(&fs_info->chunk_mutex);
1404 btrfs_close_extra_devices(fs_devices);
1406 blocksize = btrfs_level_size(tree_root,
1407 btrfs_super_root_level(disk_super));
1410 tree_root->node = read_tree_block(tree_root,
1411 btrfs_super_root(disk_super),
1413 if (!tree_root->node)
1414 goto fail_sb_buffer;
1417 ret = find_and_setup_root(tree_root, fs_info,
1418 BTRFS_EXTENT_TREE_OBJECTID, extent_root);
1420 goto fail_tree_root;
1421 extent_root->track_dirty = 1;
1423 ret = find_and_setup_root(tree_root, fs_info,
1424 BTRFS_DEV_TREE_OBJECTID, dev_root);
1425 dev_root->track_dirty = 1;
1428 goto fail_extent_root;
1430 btrfs_read_block_groups(extent_root);
1432 fs_info->generation = btrfs_super_generation(disk_super) + 1;
1433 fs_info->data_alloc_profile = (u64)-1;
1434 fs_info->metadata_alloc_profile = (u64)-1;
1435 fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
1436 fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root,
1438 if (!fs_info->cleaner_kthread)
1439 goto fail_extent_root;
1441 fs_info->transaction_kthread = kthread_run(transaction_kthread,
1443 "btrfs-transaction");
1444 if (!fs_info->transaction_kthread)
1451 kthread_stop(fs_info->cleaner_kthread);
1453 free_extent_buffer(extent_root->node);
1455 free_extent_buffer(tree_root->node);
1458 extent_io_tree_empty_lru(&BTRFS_I(fs_info->btree_inode)->io_tree);
1459 btrfs_stop_workers(&fs_info->fixup_workers);
1460 btrfs_stop_workers(&fs_info->workers);
1461 btrfs_stop_workers(&fs_info->endio_workers);
1462 btrfs_stop_workers(&fs_info->endio_write_workers);
1463 btrfs_stop_workers(&fs_info->submit_workers);
1465 iput(fs_info->btree_inode);
1467 btrfs_close_devices(fs_info->fs_devices);
1468 btrfs_mapping_tree_free(&fs_info->mapping_tree);
1472 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
1473 bdi_destroy(&fs_info->bdi);
1476 return ERR_PTR(err);
1479 static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate)
1481 char b[BDEVNAME_SIZE];
1484 set_buffer_uptodate(bh);
1486 if (!buffer_eopnotsupp(bh) && printk_ratelimit()) {
1487 printk(KERN_WARNING "lost page write due to "
1488 "I/O error on %s\n",
1489 bdevname(bh->b_bdev, b));
1491 /* note, we dont' set_buffer_write_io_error because we have
1492 * our own ways of dealing with the IO errors
1494 clear_buffer_uptodate(bh);
1500 int write_all_supers(struct btrfs_root *root)
1502 struct list_head *cur;
1503 struct list_head *head = &root->fs_info->fs_devices->devices;
1504 struct btrfs_device *dev;
1505 struct btrfs_super_block *sb;
1506 struct btrfs_dev_item *dev_item;
1507 struct buffer_head *bh;
1511 int total_errors = 0;
1515 max_errors = btrfs_super_num_devices(&root->fs_info->super_copy) - 1;
1516 do_barriers = !btrfs_test_opt(root, NOBARRIER);
1518 sb = &root->fs_info->super_for_commit;
1519 dev_item = &sb->dev_item;
1520 list_for_each(cur, head) {
1521 dev = list_entry(cur, struct btrfs_device, dev_list);
1526 if (!dev->in_fs_metadata)
1529 btrfs_set_stack_device_type(dev_item, dev->type);
1530 btrfs_set_stack_device_id(dev_item, dev->devid);
1531 btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes);
1532 btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used);
1533 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
1534 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
1535 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
1536 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
1537 flags = btrfs_super_flags(sb);
1538 btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
1542 crc = btrfs_csum_data(root, (char *)sb + BTRFS_CSUM_SIZE, crc,
1543 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1544 btrfs_csum_final(crc, sb->csum);
1546 bh = __getblk(dev->bdev, BTRFS_SUPER_INFO_OFFSET / 4096,
1547 BTRFS_SUPER_INFO_SIZE);
1549 memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE);
1550 dev->pending_io = bh;
1553 set_buffer_uptodate(bh);
1555 bh->b_end_io = btrfs_end_buffer_write_sync;
1557 if (do_barriers && dev->barriers) {
1558 ret = submit_bh(WRITE_BARRIER, bh);
1559 if (ret == -EOPNOTSUPP) {
1560 printk("btrfs: disabling barriers on dev %s\n",
1562 set_buffer_uptodate(bh);
1566 ret = submit_bh(WRITE, bh);
1569 ret = submit_bh(WRITE, bh);
1574 if (total_errors > max_errors) {
1575 printk("btrfs: %d errors while writing supers\n", total_errors);
1580 list_for_each(cur, head) {
1581 dev = list_entry(cur, struct btrfs_device, dev_list);
1584 if (!dev->in_fs_metadata)
1587 BUG_ON(!dev->pending_io);
1588 bh = dev->pending_io;
1590 if (!buffer_uptodate(dev->pending_io)) {
1591 if (do_barriers && dev->barriers) {
1592 printk("btrfs: disabling barriers on dev %s\n",
1594 set_buffer_uptodate(bh);
1598 ret = submit_bh(WRITE, bh);
1601 if (!buffer_uptodate(bh))
1608 dev->pending_io = NULL;
1611 if (total_errors > max_errors) {
1612 printk("btrfs: %d errors while writing supers\n", total_errors);
1618 int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
1623 ret = write_all_supers(root);
1627 int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
1629 radix_tree_delete(&fs_info->fs_roots_radix,
1630 (unsigned long)root->root_key.objectid);
1632 btrfs_sysfs_del_root(root);
1636 free_extent_buffer(root->node);
1637 if (root->commit_root)
1638 free_extent_buffer(root->commit_root);
1645 static int del_fs_roots(struct btrfs_fs_info *fs_info)
1648 struct btrfs_root *gang[8];
1652 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
1657 for (i = 0; i < ret; i++)
1658 btrfs_free_fs_root(fs_info, gang[i]);
1663 int close_ctree(struct btrfs_root *root)
1666 struct btrfs_trans_handle *trans;
1667 struct btrfs_fs_info *fs_info = root->fs_info;
1669 fs_info->closing = 1;
1672 kthread_stop(root->fs_info->transaction_kthread);
1673 kthread_stop(root->fs_info->cleaner_kthread);
1675 btrfs_clean_old_snapshots(root);
1676 trans = btrfs_start_transaction(root, 1);
1677 ret = btrfs_commit_transaction(trans, root);
1678 /* run commit again to drop the original snapshot */
1679 trans = btrfs_start_transaction(root, 1);
1680 btrfs_commit_transaction(trans, root);
1681 ret = btrfs_write_and_wait_transaction(NULL, root);
1684 write_ctree_super(NULL, root);
1686 if (fs_info->delalloc_bytes) {
1687 printk("btrfs: at unmount delalloc count %Lu\n",
1688 fs_info->delalloc_bytes);
1690 if (fs_info->extent_root->node)
1691 free_extent_buffer(fs_info->extent_root->node);
1693 if (fs_info->tree_root->node)
1694 free_extent_buffer(fs_info->tree_root->node);
1696 if (root->fs_info->chunk_root->node);
1697 free_extent_buffer(root->fs_info->chunk_root->node);
1699 if (root->fs_info->dev_root->node);
1700 free_extent_buffer(root->fs_info->dev_root->node);
1702 btrfs_free_block_groups(root->fs_info);
1703 del_fs_roots(fs_info);
1705 filemap_write_and_wait(fs_info->btree_inode->i_mapping);
1707 extent_io_tree_empty_lru(&fs_info->free_space_cache);
1708 extent_io_tree_empty_lru(&fs_info->block_group_cache);
1709 extent_io_tree_empty_lru(&fs_info->pinned_extents);
1710 extent_io_tree_empty_lru(&fs_info->pending_del);
1711 extent_io_tree_empty_lru(&fs_info->extent_ins);
1712 extent_io_tree_empty_lru(&BTRFS_I(fs_info->btree_inode)->io_tree);
1714 truncate_inode_pages(fs_info->btree_inode->i_mapping, 0);
1716 btrfs_stop_workers(&fs_info->fixup_workers);
1717 btrfs_stop_workers(&fs_info->workers);
1718 btrfs_stop_workers(&fs_info->endio_workers);
1719 btrfs_stop_workers(&fs_info->endio_write_workers);
1720 btrfs_stop_workers(&fs_info->submit_workers);
1722 iput(fs_info->btree_inode);
1724 while(!list_empty(&fs_info->hashers)) {
1725 struct btrfs_hasher *hasher;
1726 hasher = list_entry(fs_info->hashers.next, struct btrfs_hasher,
1728 list_del(&hasher->hashers);
1729 crypto_free_hash(&fs_info->hash_tfm);
1733 btrfs_close_devices(fs_info->fs_devices);
1734 btrfs_mapping_tree_free(&fs_info->mapping_tree);
1736 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
1737 bdi_destroy(&fs_info->bdi);
1740 kfree(fs_info->extent_root);
1741 kfree(fs_info->tree_root);
1742 kfree(fs_info->chunk_root);
1743 kfree(fs_info->dev_root);
1747 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
1750 struct inode *btree_inode = buf->first_page->mapping->host;
1752 ret = extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, buf);
1756 ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf,
1761 int btrfs_set_buffer_uptodate(struct extent_buffer *buf)
1763 struct inode *btree_inode = buf->first_page->mapping->host;
1764 return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree,
1768 void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
1770 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1771 u64 transid = btrfs_header_generation(buf);
1772 struct inode *btree_inode = root->fs_info->btree_inode;
1774 WARN_ON(!btrfs_tree_locked(buf));
1775 if (transid != root->fs_info->generation) {
1776 printk(KERN_CRIT "transid mismatch buffer %llu, found %Lu running %Lu\n",
1777 (unsigned long long)buf->start,
1778 transid, root->fs_info->generation);
1781 set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, buf);
1784 void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
1787 * looks as though older kernels can get into trouble with
1788 * this code, they end up stuck in balance_dirty_pages forever
1790 struct extent_io_tree *tree;
1793 unsigned long thresh = 16 * 1024 * 1024;
1794 tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree;
1796 if (current_is_pdflush())
1799 num_dirty = count_range_bits(tree, &start, (u64)-1,
1800 thresh, EXTENT_DIRTY);
1801 if (num_dirty > thresh) {
1802 balance_dirty_pages_ratelimited_nr(
1803 root->fs_info->btree_inode->i_mapping, 1);
1808 int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid)
1810 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1812 ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid);
1814 buf->flags |= EXTENT_UPTODATE;
1819 static struct extent_io_ops btree_extent_io_ops = {
1820 .writepage_io_hook = btree_writepage_io_hook,
1821 .readpage_end_io_hook = btree_readpage_end_io_hook,
1822 .submit_bio_hook = btree_submit_bio_hook,
1823 /* note we're sharing with inode.c for the merge bio hook */
1824 .merge_bio_hook = btrfs_merge_bio_hook,