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> // for block_sync_page
26 #include <linux/workqueue.h>
30 #include "transaction.h"
31 #include "btrfs_inode.h"
33 #include "print-tree.h"
36 static int check_tree_block(struct btrfs_root *root, struct extent_buffer *buf)
38 if (extent_buffer_blocknr(buf) != btrfs_header_blocknr(buf)) {
39 printk(KERN_CRIT "buf blocknr(buf) is %llu, header is %llu\n",
40 (unsigned long long)extent_buffer_blocknr(buf),
41 (unsigned long long)btrfs_header_blocknr(buf));
48 static struct extent_io_ops btree_extent_io_ops;
49 static struct workqueue_struct *end_io_workqueue;
50 static struct workqueue_struct *async_submit_workqueue;
56 struct btrfs_fs_info *info;
59 struct list_head list;
62 struct async_submit_bio {
65 struct list_head list;
66 extent_submit_bio_hook_t *submit_bio_hook;
71 struct extent_map *btree_get_extent(struct inode *inode, struct page *page,
72 size_t page_offset, u64 start, u64 len,
75 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
76 struct extent_map *em;
79 spin_lock(&em_tree->lock);
80 em = lookup_extent_mapping(em_tree, start, len);
81 spin_unlock(&em_tree->lock);
85 em = alloc_extent_map(GFP_NOFS);
87 em = ERR_PTR(-ENOMEM);
91 em->len = i_size_read(inode);
93 em->bdev = inode->i_sb->s_bdev;
95 spin_lock(&em_tree->lock);
96 ret = add_extent_mapping(em_tree, em);
99 em = lookup_extent_mapping(em_tree, start, len);
108 spin_unlock(&em_tree->lock);
116 u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len)
118 return btrfs_crc32c(seed, data, len);
121 void btrfs_csum_final(u32 crc, char *result)
123 *(__le32 *)result = ~cpu_to_le32(crc);
126 static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
129 char result[BTRFS_CRC32_SIZE];
131 unsigned long cur_len;
132 unsigned long offset = BTRFS_CSUM_SIZE;
133 char *map_token = NULL;
135 unsigned long map_start;
136 unsigned long map_len;
140 len = buf->len - offset;
142 err = map_private_extent_buffer(buf, offset, 32,
144 &map_start, &map_len, KM_USER0);
146 printk("failed to map extent buffer! %lu\n",
150 cur_len = min(len, map_len - (offset - map_start));
151 crc = btrfs_csum_data(root, kaddr + offset - map_start,
155 unmap_extent_buffer(buf, map_token, KM_USER0);
157 btrfs_csum_final(crc, result);
160 int from_this_trans = 0;
162 if (root->fs_info->running_transaction &&
163 btrfs_header_generation(buf) ==
164 root->fs_info->running_transaction->transid)
167 /* FIXME, this is not good */
168 if (memcmp_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE)) {
171 memcpy(&found, result, BTRFS_CRC32_SIZE);
173 read_extent_buffer(buf, &val, 0, BTRFS_CRC32_SIZE);
174 printk("btrfs: %s checksum verify failed on %llu "
175 "wanted %X found %X from_this_trans %d "
177 root->fs_info->sb->s_id,
178 buf->start, val, found, from_this_trans,
179 btrfs_header_level(buf));
183 write_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE);
188 static int btree_read_extent_buffer_pages(struct btrfs_root *root,
189 struct extent_buffer *eb,
192 struct extent_io_tree *io_tree;
197 io_tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree;
199 ret = read_extent_buffer_pages(io_tree, eb, start, 1,
200 btree_get_extent, mirror_num);
203 printk("good read %Lu mirror %d total %d\n", eb->start, mirror_num, num_copies);
206 num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
208 printk("failed to read %Lu mirror %d total %d\n", eb->start, mirror_num, num_copies);
209 if (num_copies == 1) {
210 printk("reading %Lu failed only one copy\n", eb->start);
214 if (mirror_num > num_copies) {
215 printk("bailing at mirror %d of %d\n", mirror_num, num_copies);
219 printk("read extent buffer page last\n");
223 int csum_dirty_buffer(struct btrfs_root *root, struct page *page)
225 struct extent_io_tree *tree;
226 u64 start = (u64)page->index << PAGE_CACHE_SHIFT;
230 struct extent_buffer *eb;
233 tree = &BTRFS_I(page->mapping->host)->io_tree;
235 if (page->private == EXTENT_PAGE_PRIVATE)
239 len = page->private >> 2;
243 eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS);
244 ret = btree_read_extent_buffer_pages(root, eb, start + PAGE_CACHE_SIZE);
246 btrfs_clear_buffer_defrag(eb);
247 found_start = btrfs_header_bytenr(eb);
248 if (found_start != start) {
249 printk("warning: eb start incorrect %Lu buffer %Lu len %lu\n",
250 start, found_start, len);
254 if (eb->first_page != page) {
255 printk("bad first page %lu %lu\n", eb->first_page->index,
260 if (!PageUptodate(page)) {
261 printk("csum not up to date page %lu\n", page->index);
265 found_level = btrfs_header_level(eb);
266 spin_lock(&root->fs_info->hash_lock);
267 btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
268 spin_unlock(&root->fs_info->hash_lock);
269 csum_tree_block(root, eb, 0);
271 free_extent_buffer(eb);
276 static int btree_writepage_io_hook(struct page *page, u64 start, u64 end)
278 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
280 csum_dirty_buffer(root, page);
284 int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end,
285 struct extent_state *state)
287 struct extent_io_tree *tree;
291 struct extent_buffer *eb;
292 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
295 tree = &BTRFS_I(page->mapping->host)->io_tree;
296 if (page->private == EXTENT_PAGE_PRIVATE)
300 len = page->private >> 2;
304 eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS);
306 btrfs_clear_buffer_defrag(eb);
307 found_start = btrfs_header_bytenr(eb);
308 if (found_start != start) {
309 printk("bad start on %Lu found %Lu\n", eb->start, found_start);
313 if (eb->first_page != page) {
314 printk("bad first page %lu %lu\n", eb->first_page->index,
320 found_level = btrfs_header_level(eb);
322 ret = csum_tree_block(root, eb, 1);
326 end = min_t(u64, eb->len, PAGE_CACHE_SIZE);
327 end = eb->start + end - 1;
328 release_extent_buffer_tail_pages(eb);
330 free_extent_buffer(eb);
335 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
336 static void end_workqueue_bio(struct bio *bio, int err)
338 static int end_workqueue_bio(struct bio *bio,
339 unsigned int bytes_done, int err)
342 struct end_io_wq *end_io_wq = bio->bi_private;
343 struct btrfs_fs_info *fs_info;
346 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
351 fs_info = end_io_wq->info;
352 spin_lock_irqsave(&fs_info->end_io_work_lock, flags);
353 end_io_wq->error = err;
354 list_add_tail(&end_io_wq->list, &fs_info->end_io_work_list);
355 spin_unlock_irqrestore(&fs_info->end_io_work_lock, flags);
356 queue_work(end_io_workqueue, &fs_info->end_io_work);
358 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
363 int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
366 struct end_io_wq *end_io_wq;
367 end_io_wq = kmalloc(sizeof(*end_io_wq), GFP_NOFS);
371 end_io_wq->private = bio->bi_private;
372 end_io_wq->end_io = bio->bi_end_io;
373 end_io_wq->info = info;
374 end_io_wq->error = 0;
375 end_io_wq->bio = bio;
376 end_io_wq->metadata = metadata;
378 bio->bi_private = end_io_wq;
379 bio->bi_end_io = end_workqueue_bio;
383 int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
384 int rw, struct bio *bio, int mirror_num,
385 extent_submit_bio_hook_t *submit_bio_hook)
387 struct async_submit_bio *async;
390 * inline writerback should stay inline, only hop to the async
391 * queue if we're pdflush
393 if (!current_is_pdflush())
394 return submit_bio_hook(inode, rw, bio, mirror_num);
396 async = kmalloc(sizeof(*async), GFP_NOFS);
400 async->inode = inode;
403 async->mirror_num = mirror_num;
404 async->submit_bio_hook = submit_bio_hook;
406 spin_lock(&fs_info->async_submit_work_lock);
407 list_add_tail(&async->list, &fs_info->async_submit_work_list);
408 spin_unlock(&fs_info->async_submit_work_lock);
410 queue_work(async_submit_workqueue, &fs_info->async_submit_work);
414 static int __btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
417 struct btrfs_root *root = BTRFS_I(inode)->root;
421 offset = bio->bi_sector << 9;
423 if (rw & (1 << BIO_RW)) {
424 return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num);
427 ret = btrfs_bio_wq_end_io(root->fs_info, bio, 1);
430 if (offset == BTRFS_SUPER_INFO_OFFSET) {
431 bio->bi_bdev = root->fs_info->fs_devices->latest_bdev;
435 return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num);
438 static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
441 if (!(rw & (1 << BIO_RW))) {
442 return __btree_submit_bio_hook(inode, rw, bio, mirror_num);
444 return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info,
445 inode, rw, bio, mirror_num,
446 __btree_submit_bio_hook);
449 static int btree_writepage(struct page *page, struct writeback_control *wbc)
451 struct extent_io_tree *tree;
452 tree = &BTRFS_I(page->mapping->host)->io_tree;
453 return extent_write_full_page(tree, page, btree_get_extent, wbc);
456 static int btree_writepages(struct address_space *mapping,
457 struct writeback_control *wbc)
459 struct extent_io_tree *tree;
460 tree = &BTRFS_I(mapping->host)->io_tree;
461 if (wbc->sync_mode == WB_SYNC_NONE) {
464 unsigned long thresh = 96 * 1024 * 1024;
466 if (wbc->for_kupdate)
469 if (current_is_pdflush()) {
470 thresh = 96 * 1024 * 1024;
472 thresh = 8 * 1024 * 1024;
474 num_dirty = count_range_bits(tree, &start, (u64)-1,
475 thresh, EXTENT_DIRTY);
476 if (num_dirty < thresh) {
480 return extent_writepages(tree, mapping, btree_get_extent, wbc);
483 int btree_readpage(struct file *file, struct page *page)
485 struct extent_io_tree *tree;
486 tree = &BTRFS_I(page->mapping->host)->io_tree;
487 return extent_read_full_page(tree, page, btree_get_extent);
490 static int btree_releasepage(struct page *page, gfp_t gfp_flags)
492 struct extent_io_tree *tree;
493 struct extent_map_tree *map;
496 if (page_count(page) > 3) {
497 /* once for page->private, once for the caller, once
498 * once for the page cache
502 tree = &BTRFS_I(page->mapping->host)->io_tree;
503 map = &BTRFS_I(page->mapping->host)->extent_tree;
504 ret = try_release_extent_state(map, tree, page, gfp_flags);
506 invalidate_extent_lru(tree, page_offset(page), PAGE_CACHE_SIZE);
507 ClearPagePrivate(page);
508 set_page_private(page, 0);
509 page_cache_release(page);
514 static void btree_invalidatepage(struct page *page, unsigned long offset)
516 struct extent_io_tree *tree;
517 tree = &BTRFS_I(page->mapping->host)->io_tree;
518 extent_invalidatepage(tree, page, offset);
519 btree_releasepage(page, GFP_NOFS);
523 static int btree_writepage(struct page *page, struct writeback_control *wbc)
525 struct buffer_head *bh;
526 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
527 struct buffer_head *head;
528 if (!page_has_buffers(page)) {
529 create_empty_buffers(page, root->fs_info->sb->s_blocksize,
530 (1 << BH_Dirty)|(1 << BH_Uptodate));
532 head = page_buffers(page);
535 if (buffer_dirty(bh))
536 csum_tree_block(root, bh, 0);
537 bh = bh->b_this_page;
538 } while (bh != head);
539 return block_write_full_page(page, btree_get_block, wbc);
543 static struct address_space_operations btree_aops = {
544 .readpage = btree_readpage,
545 .writepage = btree_writepage,
546 .writepages = btree_writepages,
547 .releasepage = btree_releasepage,
548 .invalidatepage = btree_invalidatepage,
549 .sync_page = block_sync_page,
552 int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize)
554 struct extent_buffer *buf = NULL;
555 struct inode *btree_inode = root->fs_info->btree_inode;
558 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
561 read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree,
562 buf, 0, 0, btree_get_extent, 0);
563 free_extent_buffer(buf);
567 static int close_all_devices(struct btrfs_fs_info *fs_info)
569 struct list_head *list;
570 struct list_head *next;
571 struct btrfs_device *device;
573 list = &fs_info->fs_devices->devices;
574 list_for_each(next, list) {
575 device = list_entry(next, struct btrfs_device, dev_list);
576 if (device->bdev && device->bdev != fs_info->sb->s_bdev)
577 close_bdev_excl(device->bdev);
583 int btrfs_verify_block_csum(struct btrfs_root *root,
584 struct extent_buffer *buf)
586 return btrfs_buffer_uptodate(buf);
589 struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
590 u64 bytenr, u32 blocksize)
592 struct inode *btree_inode = root->fs_info->btree_inode;
593 struct extent_buffer *eb;
594 eb = find_extent_buffer(&BTRFS_I(btree_inode)->io_tree,
595 bytenr, blocksize, GFP_NOFS);
599 struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
600 u64 bytenr, u32 blocksize)
602 struct inode *btree_inode = root->fs_info->btree_inode;
603 struct extent_buffer *eb;
605 eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->io_tree,
606 bytenr, blocksize, NULL, GFP_NOFS);
611 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
614 struct extent_buffer *buf = NULL;
615 struct inode *btree_inode = root->fs_info->btree_inode;
616 struct extent_io_tree *io_tree;
619 io_tree = &BTRFS_I(btree_inode)->io_tree;
621 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
625 ret = btree_read_extent_buffer_pages(root, buf, 0);
628 buf->flags |= EXTENT_UPTODATE;
634 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
635 struct extent_buffer *buf)
637 struct inode *btree_inode = root->fs_info->btree_inode;
638 if (btrfs_header_generation(buf) ==
639 root->fs_info->running_transaction->transid)
640 clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree,
645 int wait_on_tree_block_writeback(struct btrfs_root *root,
646 struct extent_buffer *buf)
648 struct inode *btree_inode = root->fs_info->btree_inode;
649 wait_on_extent_buffer_writeback(&BTRFS_I(btree_inode)->io_tree,
654 static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
655 u32 stripesize, struct btrfs_root *root,
656 struct btrfs_fs_info *fs_info,
661 root->commit_root = NULL;
662 root->sectorsize = sectorsize;
663 root->nodesize = nodesize;
664 root->leafsize = leafsize;
665 root->stripesize = stripesize;
667 root->track_dirty = 0;
669 root->fs_info = fs_info;
670 root->objectid = objectid;
671 root->last_trans = 0;
672 root->highest_inode = 0;
673 root->last_inode_alloc = 0;
677 INIT_LIST_HEAD(&root->dirty_list);
678 memset(&root->root_key, 0, sizeof(root->root_key));
679 memset(&root->root_item, 0, sizeof(root->root_item));
680 memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
681 memset(&root->root_kobj, 0, sizeof(root->root_kobj));
682 init_completion(&root->kobj_unregister);
683 root->defrag_running = 0;
684 root->defrag_level = 0;
685 root->root_key.objectid = objectid;
689 static int find_and_setup_root(struct btrfs_root *tree_root,
690 struct btrfs_fs_info *fs_info,
692 struct btrfs_root *root)
697 __setup_root(tree_root->nodesize, tree_root->leafsize,
698 tree_root->sectorsize, tree_root->stripesize,
699 root, fs_info, objectid);
700 ret = btrfs_find_last_root(tree_root, objectid,
701 &root->root_item, &root->root_key);
704 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
705 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
711 struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_fs_info *fs_info,
712 struct btrfs_key *location)
714 struct btrfs_root *root;
715 struct btrfs_root *tree_root = fs_info->tree_root;
716 struct btrfs_path *path;
717 struct extent_buffer *l;
722 root = kzalloc(sizeof(*root), GFP_NOFS);
724 return ERR_PTR(-ENOMEM);
725 if (location->offset == (u64)-1) {
726 ret = find_and_setup_root(tree_root, fs_info,
727 location->objectid, root);
735 __setup_root(tree_root->nodesize, tree_root->leafsize,
736 tree_root->sectorsize, tree_root->stripesize,
737 root, fs_info, location->objectid);
739 path = btrfs_alloc_path();
741 ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
748 read_extent_buffer(l, &root->root_item,
749 btrfs_item_ptr_offset(l, path->slots[0]),
750 sizeof(root->root_item));
751 memcpy(&root->root_key, location, sizeof(*location));
754 btrfs_release_path(root, path);
755 btrfs_free_path(path);
760 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
761 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
766 ret = btrfs_find_highest_inode(root, &highest_inode);
768 root->highest_inode = highest_inode;
769 root->last_inode_alloc = highest_inode;
774 struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
777 struct btrfs_root *root;
779 if (root_objectid == BTRFS_ROOT_TREE_OBJECTID)
780 return fs_info->tree_root;
781 if (root_objectid == BTRFS_EXTENT_TREE_OBJECTID)
782 return fs_info->extent_root;
784 root = radix_tree_lookup(&fs_info->fs_roots_radix,
785 (unsigned long)root_objectid);
789 struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
790 struct btrfs_key *location)
792 struct btrfs_root *root;
795 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
796 return fs_info->tree_root;
797 if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
798 return fs_info->extent_root;
800 root = radix_tree_lookup(&fs_info->fs_roots_radix,
801 (unsigned long)location->objectid);
805 root = btrfs_read_fs_root_no_radix(fs_info, location);
808 ret = radix_tree_insert(&fs_info->fs_roots_radix,
809 (unsigned long)root->root_key.objectid,
812 free_extent_buffer(root->node);
816 ret = btrfs_find_dead_roots(fs_info->tree_root,
817 root->root_key.objectid, root);
823 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
824 struct btrfs_key *location,
825 const char *name, int namelen)
827 struct btrfs_root *root;
830 root = btrfs_read_fs_root_no_name(fs_info, location);
837 ret = btrfs_set_root_name(root, name, namelen);
839 free_extent_buffer(root->node);
844 ret = btrfs_sysfs_add_root(root);
846 free_extent_buffer(root->node);
855 static int add_hasher(struct btrfs_fs_info *info, char *type) {
856 struct btrfs_hasher *hasher;
858 hasher = kmalloc(sizeof(*hasher), GFP_NOFS);
861 hasher->hash_tfm = crypto_alloc_hash(type, 0, CRYPTO_ALG_ASYNC);
862 if (!hasher->hash_tfm) {
866 spin_lock(&info->hash_lock);
867 list_add(&hasher->list, &info->hashers);
868 spin_unlock(&info->hash_lock);
873 static int btrfs_congested_fn(void *congested_data, int bdi_bits)
875 struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data;
877 struct list_head *cur;
878 struct btrfs_device *device;
879 struct backing_dev_info *bdi;
881 list_for_each(cur, &info->fs_devices->devices) {
882 device = list_entry(cur, struct btrfs_device, dev_list);
883 bdi = blk_get_backing_dev_info(device->bdev);
884 if (bdi && bdi_congested(bdi, bdi_bits)) {
892 void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
894 struct list_head *cur;
895 struct btrfs_device *device;
896 struct btrfs_fs_info *info;
898 info = (struct btrfs_fs_info *)bdi->unplug_io_data;
899 list_for_each(cur, &info->fs_devices->devices) {
900 device = list_entry(cur, struct btrfs_device, dev_list);
901 bdi = blk_get_backing_dev_info(device->bdev);
902 if (bdi->unplug_io_fn) {
903 bdi->unplug_io_fn(bdi, page);
908 static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi)
910 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23)
913 bdi->ra_pages = default_backing_dev_info.ra_pages * 4;
915 bdi->capabilities = default_backing_dev_info.capabilities;
916 bdi->unplug_io_fn = btrfs_unplug_io_fn;
917 bdi->unplug_io_data = info;
918 bdi->congested_fn = btrfs_congested_fn;
919 bdi->congested_data = info;
923 static int bio_ready_for_csum(struct bio *bio)
929 struct extent_io_tree *io_tree = NULL;
930 struct btrfs_fs_info *info = NULL;
931 struct bio_vec *bvec;
935 bio_for_each_segment(bvec, bio, i) {
936 page = bvec->bv_page;
937 if (page->private == EXTENT_PAGE_PRIVATE) {
938 length += bvec->bv_len;
941 if (!page->private) {
942 length += bvec->bv_len;
945 length = bvec->bv_len;
946 buf_len = page->private >> 2;
947 start = page_offset(page) + bvec->bv_offset;
948 io_tree = &BTRFS_I(page->mapping->host)->io_tree;
949 info = BTRFS_I(page->mapping->host)->root->fs_info;
951 /* are we fully contained in this bio? */
952 if (buf_len <= length)
955 ret = extent_range_uptodate(io_tree, start + length,
956 start + buf_len - 1);
962 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
963 static void btrfs_end_io_csum(void *p)
965 static void btrfs_end_io_csum(struct work_struct *work)
968 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
969 struct btrfs_fs_info *fs_info = p;
971 struct btrfs_fs_info *fs_info = container_of(work,
972 struct btrfs_fs_info,
976 struct end_io_wq *end_io_wq;
978 struct list_head *next;
983 spin_lock_irqsave(&fs_info->end_io_work_lock, flags);
984 if (list_empty(&fs_info->end_io_work_list)) {
985 spin_unlock_irqrestore(&fs_info->end_io_work_lock,
989 next = fs_info->end_io_work_list.next;
991 spin_unlock_irqrestore(&fs_info->end_io_work_lock, flags);
993 end_io_wq = list_entry(next, struct end_io_wq, list);
995 bio = end_io_wq->bio;
996 if (end_io_wq->metadata && !bio_ready_for_csum(bio)) {
997 spin_lock_irqsave(&fs_info->end_io_work_lock, flags);
998 was_empty = list_empty(&fs_info->end_io_work_list);
999 list_add_tail(&end_io_wq->list,
1000 &fs_info->end_io_work_list);
1001 spin_unlock_irqrestore(&fs_info->end_io_work_lock,
1007 error = end_io_wq->error;
1008 bio->bi_private = end_io_wq->private;
1009 bio->bi_end_io = end_io_wq->end_io;
1011 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
1012 bio_endio(bio, bio->bi_size, error);
1014 bio_endio(bio, error);
1019 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1020 static void btrfs_async_submit_work(void *p)
1022 static void btrfs_async_submit_work(struct work_struct *work)
1025 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1026 struct btrfs_fs_info *fs_info = p;
1028 struct btrfs_fs_info *fs_info = container_of(work,
1029 struct btrfs_fs_info,
1032 struct async_submit_bio *async;
1033 struct list_head *next;
1036 spin_lock(&fs_info->async_submit_work_lock);
1037 if (list_empty(&fs_info->async_submit_work_list)) {
1038 spin_unlock(&fs_info->async_submit_work_lock);
1041 next = fs_info->async_submit_work_list.next;
1043 spin_unlock(&fs_info->async_submit_work_lock);
1045 async = list_entry(next, struct async_submit_bio, list);
1046 async->submit_bio_hook(async->inode, async->rw, async->bio,
1052 struct btrfs_root *open_ctree(struct super_block *sb,
1053 struct btrfs_fs_devices *fs_devices)
1060 struct btrfs_root *extent_root = kmalloc(sizeof(struct btrfs_root),
1062 struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root),
1064 struct btrfs_fs_info *fs_info = kzalloc(sizeof(*fs_info),
1066 struct btrfs_root *chunk_root = kmalloc(sizeof(struct btrfs_root),
1068 struct btrfs_root *dev_root = kmalloc(sizeof(struct btrfs_root),
1072 struct btrfs_super_block *disk_super;
1074 if (!extent_root || !tree_root || !fs_info) {
1078 end_io_workqueue = create_workqueue("btrfs-end-io");
1079 BUG_ON(!end_io_workqueue);
1080 async_submit_workqueue = create_workqueue("btrfs-async-submit");
1082 INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_NOFS);
1083 INIT_LIST_HEAD(&fs_info->trans_list);
1084 INIT_LIST_HEAD(&fs_info->dead_roots);
1085 INIT_LIST_HEAD(&fs_info->hashers);
1086 INIT_LIST_HEAD(&fs_info->end_io_work_list);
1087 INIT_LIST_HEAD(&fs_info->async_submit_work_list);
1088 spin_lock_init(&fs_info->hash_lock);
1089 spin_lock_init(&fs_info->end_io_work_lock);
1090 spin_lock_init(&fs_info->async_submit_work_lock);
1091 spin_lock_init(&fs_info->delalloc_lock);
1092 spin_lock_init(&fs_info->new_trans_lock);
1094 init_completion(&fs_info->kobj_unregister);
1095 sb_set_blocksize(sb, BTRFS_SUPER_INFO_SIZE);
1096 fs_info->tree_root = tree_root;
1097 fs_info->extent_root = extent_root;
1098 fs_info->chunk_root = chunk_root;
1099 fs_info->dev_root = dev_root;
1100 fs_info->fs_devices = fs_devices;
1101 INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
1102 INIT_LIST_HEAD(&fs_info->space_info);
1103 btrfs_mapping_init(&fs_info->mapping_tree);
1105 fs_info->max_extent = (u64)-1;
1106 fs_info->max_inline = 8192 * 1024;
1107 setup_bdi(fs_info, &fs_info->bdi);
1108 fs_info->btree_inode = new_inode(sb);
1109 fs_info->btree_inode->i_ino = 1;
1110 fs_info->btree_inode->i_nlink = 1;
1111 fs_info->btree_inode->i_size = sb->s_bdev->bd_inode->i_size;
1112 fs_info->btree_inode->i_mapping->a_ops = &btree_aops;
1113 fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi;
1115 extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree,
1116 fs_info->btree_inode->i_mapping,
1118 extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree,
1121 BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops;
1123 extent_io_tree_init(&fs_info->free_space_cache,
1124 fs_info->btree_inode->i_mapping, GFP_NOFS);
1125 extent_io_tree_init(&fs_info->block_group_cache,
1126 fs_info->btree_inode->i_mapping, GFP_NOFS);
1127 extent_io_tree_init(&fs_info->pinned_extents,
1128 fs_info->btree_inode->i_mapping, GFP_NOFS);
1129 extent_io_tree_init(&fs_info->pending_del,
1130 fs_info->btree_inode->i_mapping, GFP_NOFS);
1131 extent_io_tree_init(&fs_info->extent_ins,
1132 fs_info->btree_inode->i_mapping, GFP_NOFS);
1133 fs_info->do_barriers = 1;
1135 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1136 INIT_WORK(&fs_info->end_io_work, btrfs_end_io_csum, fs_info);
1137 INIT_WORK(&fs_info->async_submit_work, btrfs_async_submit_work,
1139 INIT_WORK(&fs_info->trans_work, btrfs_transaction_cleaner, fs_info);
1141 INIT_WORK(&fs_info->end_io_work, btrfs_end_io_csum);
1142 INIT_WORK(&fs_info->async_submit_work, btrfs_async_submit_work);
1143 INIT_DELAYED_WORK(&fs_info->trans_work, btrfs_transaction_cleaner);
1145 BTRFS_I(fs_info->btree_inode)->root = tree_root;
1146 memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
1147 sizeof(struct btrfs_key));
1148 insert_inode_hash(fs_info->btree_inode);
1149 mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
1151 mutex_init(&fs_info->trans_mutex);
1152 mutex_init(&fs_info->fs_mutex);
1155 ret = add_hasher(fs_info, "crc32c");
1157 printk("btrfs: failed hash setup, modprobe cryptomgr?\n");
1162 __setup_root(4096, 4096, 4096, 4096, tree_root,
1163 fs_info, BTRFS_ROOT_TREE_OBJECTID);
1165 fs_info->sb_buffer = read_tree_block(tree_root,
1166 BTRFS_SUPER_INFO_OFFSET,
1169 if (!fs_info->sb_buffer)
1172 read_extent_buffer(fs_info->sb_buffer, &fs_info->super_copy, 0,
1173 sizeof(fs_info->super_copy));
1175 read_extent_buffer(fs_info->sb_buffer, fs_info->fsid,
1176 (unsigned long)btrfs_super_fsid(fs_info->sb_buffer),
1179 disk_super = &fs_info->super_copy;
1180 if (!btrfs_super_root(disk_super))
1181 goto fail_sb_buffer;
1183 if (btrfs_super_num_devices(disk_super) != fs_devices->num_devices) {
1184 printk("Btrfs: wanted %llu devices, but found %llu\n",
1185 (unsigned long long)btrfs_super_num_devices(disk_super),
1186 (unsigned long long)fs_devices->num_devices);
1187 goto fail_sb_buffer;
1189 nodesize = btrfs_super_nodesize(disk_super);
1190 leafsize = btrfs_super_leafsize(disk_super);
1191 sectorsize = btrfs_super_sectorsize(disk_super);
1192 stripesize = btrfs_super_stripesize(disk_super);
1193 tree_root->nodesize = nodesize;
1194 tree_root->leafsize = leafsize;
1195 tree_root->sectorsize = sectorsize;
1196 tree_root->stripesize = stripesize;
1197 sb_set_blocksize(sb, sectorsize);
1199 i_size_write(fs_info->btree_inode,
1200 btrfs_super_total_bytes(disk_super));
1202 if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
1203 sizeof(disk_super->magic))) {
1204 printk("btrfs: valid FS not found on %s\n", sb->s_id);
1205 goto fail_sb_buffer;
1208 mutex_lock(&fs_info->fs_mutex);
1210 ret = btrfs_read_sys_array(tree_root);
1213 blocksize = btrfs_level_size(tree_root,
1214 btrfs_super_chunk_root_level(disk_super));
1216 __setup_root(nodesize, leafsize, sectorsize, stripesize,
1217 chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
1219 chunk_root->node = read_tree_block(chunk_root,
1220 btrfs_super_chunk_root(disk_super),
1222 BUG_ON(!chunk_root->node);
1224 read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
1225 (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node),
1228 ret = btrfs_read_chunk_tree(chunk_root);
1231 blocksize = btrfs_level_size(tree_root,
1232 btrfs_super_root_level(disk_super));
1235 tree_root->node = read_tree_block(tree_root,
1236 btrfs_super_root(disk_super),
1238 if (!tree_root->node)
1239 goto fail_sb_buffer;
1242 ret = find_and_setup_root(tree_root, fs_info,
1243 BTRFS_EXTENT_TREE_OBJECTID, extent_root);
1245 goto fail_tree_root;
1246 extent_root->track_dirty = 1;
1248 ret = find_and_setup_root(tree_root, fs_info,
1249 BTRFS_DEV_TREE_OBJECTID, dev_root);
1250 dev_root->track_dirty = 1;
1253 goto fail_extent_root;
1255 btrfs_read_block_groups(extent_root);
1257 fs_info->generation = btrfs_super_generation(disk_super) + 1;
1258 fs_info->data_alloc_profile = (u64)-1;
1259 fs_info->metadata_alloc_profile = (u64)-1;
1260 fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
1262 mutex_unlock(&fs_info->fs_mutex);
1266 free_extent_buffer(extent_root->node);
1268 mutex_unlock(&fs_info->fs_mutex);
1269 free_extent_buffer(tree_root->node);
1271 free_extent_buffer(fs_info->sb_buffer);
1272 extent_io_tree_empty_lru(&BTRFS_I(fs_info->btree_inode)->io_tree);
1274 iput(fs_info->btree_inode);
1276 close_all_devices(fs_info);
1279 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23)
1280 bdi_destroy(&fs_info->bdi);
1283 return ERR_PTR(err);
1286 static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate)
1288 char b[BDEVNAME_SIZE];
1291 set_buffer_uptodate(bh);
1293 if (!buffer_eopnotsupp(bh) && printk_ratelimit()) {
1294 printk(KERN_WARNING "lost page write due to "
1295 "I/O error on %s\n",
1296 bdevname(bh->b_bdev, b));
1298 set_buffer_write_io_error(bh);
1299 clear_buffer_uptodate(bh);
1305 int write_all_supers(struct btrfs_root *root)
1307 struct list_head *cur;
1308 struct list_head *head = &root->fs_info->fs_devices->devices;
1309 struct btrfs_device *dev;
1310 struct extent_buffer *sb;
1311 struct btrfs_dev_item *dev_item;
1312 struct buffer_head *bh;
1316 do_barriers = !btrfs_test_opt(root, NOBARRIER);
1318 sb = root->fs_info->sb_buffer;
1319 dev_item = (struct btrfs_dev_item *)offsetof(struct btrfs_super_block,
1321 list_for_each(cur, head) {
1322 dev = list_entry(cur, struct btrfs_device, dev_list);
1323 btrfs_set_device_type(sb, dev_item, dev->type);
1324 btrfs_set_device_id(sb, dev_item, dev->devid);
1325 btrfs_set_device_total_bytes(sb, dev_item, dev->total_bytes);
1326 btrfs_set_device_bytes_used(sb, dev_item, dev->bytes_used);
1327 btrfs_set_device_io_align(sb, dev_item, dev->io_align);
1328 btrfs_set_device_io_width(sb, dev_item, dev->io_width);
1329 btrfs_set_device_sector_size(sb, dev_item, dev->sector_size);
1330 write_extent_buffer(sb, dev->uuid,
1331 (unsigned long)btrfs_device_uuid(dev_item),
1334 btrfs_set_header_flag(sb, BTRFS_HEADER_FLAG_WRITTEN);
1335 csum_tree_block(root, sb, 0);
1337 bh = __getblk(dev->bdev, BTRFS_SUPER_INFO_OFFSET /
1338 root->fs_info->sb->s_blocksize,
1339 BTRFS_SUPER_INFO_SIZE);
1341 read_extent_buffer(sb, bh->b_data, 0, BTRFS_SUPER_INFO_SIZE);
1342 dev->pending_io = bh;
1345 set_buffer_uptodate(bh);
1347 bh->b_end_io = btrfs_end_buffer_write_sync;
1349 if (do_barriers && dev->barriers) {
1350 ret = submit_bh(WRITE_BARRIER, bh);
1351 if (ret == -EOPNOTSUPP) {
1352 printk("btrfs: disabling barriers on dev %s\n",
1354 set_buffer_uptodate(bh);
1358 ret = submit_bh(WRITE, bh);
1361 ret = submit_bh(WRITE, bh);
1366 list_for_each(cur, head) {
1367 dev = list_entry(cur, struct btrfs_device, dev_list);
1368 BUG_ON(!dev->pending_io);
1369 bh = dev->pending_io;
1371 if (!buffer_uptodate(dev->pending_io)) {
1372 if (do_barriers && dev->barriers) {
1373 printk("btrfs: disabling barriers on dev %s\n",
1375 set_buffer_uptodate(bh);
1379 ret = submit_bh(WRITE, bh);
1382 BUG_ON(!buffer_uptodate(bh));
1388 dev->pending_io = NULL;
1394 int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
1399 ret = write_all_supers(root);
1401 if (!btrfs_test_opt(root, NOBARRIER))
1402 blkdev_issue_flush(sb->s_bdev, NULL);
1403 set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, super);
1404 ret = sync_page_range_nolock(btree_inode, btree_inode->i_mapping,
1405 super->start, super->len);
1406 if (!btrfs_test_opt(root, NOBARRIER))
1407 blkdev_issue_flush(sb->s_bdev, NULL);
1412 int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
1414 radix_tree_delete(&fs_info->fs_roots_radix,
1415 (unsigned long)root->root_key.objectid);
1417 btrfs_sysfs_del_root(root);
1421 free_extent_buffer(root->node);
1422 if (root->commit_root)
1423 free_extent_buffer(root->commit_root);
1430 static int del_fs_roots(struct btrfs_fs_info *fs_info)
1433 struct btrfs_root *gang[8];
1437 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
1442 for (i = 0; i < ret; i++)
1443 btrfs_free_fs_root(fs_info, gang[i]);
1448 int close_ctree(struct btrfs_root *root)
1451 struct btrfs_trans_handle *trans;
1452 struct btrfs_fs_info *fs_info = root->fs_info;
1454 fs_info->closing = 1;
1455 btrfs_transaction_flush_work(root);
1456 mutex_lock(&fs_info->fs_mutex);
1457 btrfs_defrag_dirty_roots(root->fs_info);
1458 trans = btrfs_start_transaction(root, 1);
1459 ret = btrfs_commit_transaction(trans, root);
1460 /* run commit again to drop the original snapshot */
1461 trans = btrfs_start_transaction(root, 1);
1462 btrfs_commit_transaction(trans, root);
1463 ret = btrfs_write_and_wait_transaction(NULL, root);
1465 write_ctree_super(NULL, root);
1466 mutex_unlock(&fs_info->fs_mutex);
1468 if (fs_info->delalloc_bytes) {
1469 printk("btrfs: at unmount delalloc count %Lu\n",
1470 fs_info->delalloc_bytes);
1472 if (fs_info->extent_root->node)
1473 free_extent_buffer(fs_info->extent_root->node);
1475 if (fs_info->tree_root->node)
1476 free_extent_buffer(fs_info->tree_root->node);
1478 if (root->fs_info->chunk_root->node);
1479 free_extent_buffer(root->fs_info->chunk_root->node);
1481 if (root->fs_info->dev_root->node);
1482 free_extent_buffer(root->fs_info->dev_root->node);
1484 free_extent_buffer(fs_info->sb_buffer);
1486 btrfs_free_block_groups(root->fs_info);
1487 del_fs_roots(fs_info);
1489 filemap_write_and_wait(fs_info->btree_inode->i_mapping);
1491 extent_io_tree_empty_lru(&fs_info->free_space_cache);
1492 extent_io_tree_empty_lru(&fs_info->block_group_cache);
1493 extent_io_tree_empty_lru(&fs_info->pinned_extents);
1494 extent_io_tree_empty_lru(&fs_info->pending_del);
1495 extent_io_tree_empty_lru(&fs_info->extent_ins);
1496 extent_io_tree_empty_lru(&BTRFS_I(fs_info->btree_inode)->io_tree);
1498 truncate_inode_pages(fs_info->btree_inode->i_mapping, 0);
1499 flush_workqueue(end_io_workqueue);
1500 destroy_workqueue(end_io_workqueue);
1502 flush_workqueue(async_submit_workqueue);
1503 destroy_workqueue(async_submit_workqueue);
1505 iput(fs_info->btree_inode);
1507 while(!list_empty(&fs_info->hashers)) {
1508 struct btrfs_hasher *hasher;
1509 hasher = list_entry(fs_info->hashers.next, struct btrfs_hasher,
1511 list_del(&hasher->hashers);
1512 crypto_free_hash(&fs_info->hash_tfm);
1516 close_all_devices(fs_info);
1517 btrfs_mapping_tree_free(&fs_info->mapping_tree);
1519 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23)
1520 bdi_destroy(&fs_info->bdi);
1523 kfree(fs_info->extent_root);
1524 kfree(fs_info->tree_root);
1525 kfree(fs_info->chunk_root);
1526 kfree(fs_info->dev_root);
1530 int btrfs_buffer_uptodate(struct extent_buffer *buf)
1532 struct inode *btree_inode = buf->first_page->mapping->host;
1533 return extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, buf);
1536 int btrfs_set_buffer_uptodate(struct extent_buffer *buf)
1538 struct inode *btree_inode = buf->first_page->mapping->host;
1539 return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree,
1543 void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
1545 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1546 u64 transid = btrfs_header_generation(buf);
1547 struct inode *btree_inode = root->fs_info->btree_inode;
1549 if (transid != root->fs_info->generation) {
1550 printk(KERN_CRIT "transid mismatch buffer %llu, found %Lu running %Lu\n",
1551 (unsigned long long)buf->start,
1552 transid, root->fs_info->generation);
1555 set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, buf);
1558 void btrfs_throttle(struct btrfs_root *root)
1560 struct backing_dev_info *bdi;
1562 bdi = root->fs_info->sb->s_bdev->bd_inode->i_mapping->backing_dev_info;
1563 if (root->fs_info->throttles && bdi_write_congested(bdi)) {
1564 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18)
1565 congestion_wait(WRITE, HZ/20);
1567 blk_congestion_wait(WRITE, HZ/20);
1572 void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
1574 balance_dirty_pages_ratelimited_nr(
1575 root->fs_info->btree_inode->i_mapping, 1);
1578 void btrfs_set_buffer_defrag(struct extent_buffer *buf)
1580 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1581 struct inode *btree_inode = root->fs_info->btree_inode;
1582 set_extent_bits(&BTRFS_I(btree_inode)->io_tree, buf->start,
1583 buf->start + buf->len - 1, EXTENT_DEFRAG, GFP_NOFS);
1586 void btrfs_set_buffer_defrag_done(struct extent_buffer *buf)
1588 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1589 struct inode *btree_inode = root->fs_info->btree_inode;
1590 set_extent_bits(&BTRFS_I(btree_inode)->io_tree, buf->start,
1591 buf->start + buf->len - 1, EXTENT_DEFRAG_DONE,
1595 int btrfs_buffer_defrag(struct extent_buffer *buf)
1597 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1598 struct inode *btree_inode = root->fs_info->btree_inode;
1599 return test_range_bit(&BTRFS_I(btree_inode)->io_tree,
1600 buf->start, buf->start + buf->len - 1, EXTENT_DEFRAG, 0);
1603 int btrfs_buffer_defrag_done(struct extent_buffer *buf)
1605 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1606 struct inode *btree_inode = root->fs_info->btree_inode;
1607 return test_range_bit(&BTRFS_I(btree_inode)->io_tree,
1608 buf->start, buf->start + buf->len - 1,
1609 EXTENT_DEFRAG_DONE, 0);
1612 int btrfs_clear_buffer_defrag_done(struct extent_buffer *buf)
1614 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1615 struct inode *btree_inode = root->fs_info->btree_inode;
1616 return clear_extent_bits(&BTRFS_I(btree_inode)->io_tree,
1617 buf->start, buf->start + buf->len - 1,
1618 EXTENT_DEFRAG_DONE, GFP_NOFS);
1621 int btrfs_clear_buffer_defrag(struct extent_buffer *buf)
1623 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1624 struct inode *btree_inode = root->fs_info->btree_inode;
1625 return clear_extent_bits(&BTRFS_I(btree_inode)->io_tree,
1626 buf->start, buf->start + buf->len - 1,
1627 EXTENT_DEFRAG, GFP_NOFS);
1630 int btrfs_read_buffer(struct extent_buffer *buf)
1632 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1634 ret = btree_read_extent_buffer_pages(root, buf, 0);
1636 buf->flags |= EXTENT_UPTODATE;
1641 static struct extent_io_ops btree_extent_io_ops = {
1642 .writepage_io_hook = btree_writepage_io_hook,
1643 .readpage_end_io_hook = btree_readpage_end_io_hook,
1644 .submit_bio_hook = btree_submit_bio_hook,
1645 /* note we're sharing with inode.c for the merge bio hook */
1646 .merge_bio_hook = btrfs_merge_bio_hook,