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/crc32c.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
29 #include "transaction.h"
30 #include "btrfs_inode.h"
31 #include "print-tree.h"
34 static int check_tree_block(struct btrfs_root *root, struct extent_buffer *buf)
36 if (extent_buffer_blocknr(buf) != btrfs_header_blocknr(buf)) {
37 printk(KERN_CRIT "buf blocknr(buf) is %llu, header is %llu\n",
38 (unsigned long long)extent_buffer_blocknr(buf),
39 (unsigned long long)btrfs_header_blocknr(buf));
46 static struct extent_map_ops btree_extent_map_ops;
48 struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
49 u64 bytenr, u32 blocksize)
51 struct inode *btree_inode = root->fs_info->btree_inode;
52 struct extent_buffer *eb;
53 eb = find_extent_buffer(&BTRFS_I(btree_inode)->extent_tree,
54 bytenr, blocksize, GFP_NOFS);
58 struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
59 u64 bytenr, u32 blocksize)
61 struct inode *btree_inode = root->fs_info->btree_inode;
62 struct extent_buffer *eb;
64 eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->extent_tree,
65 bytenr, blocksize, NULL, GFP_NOFS);
69 struct extent_map *btree_get_extent(struct inode *inode, struct page *page,
70 size_t page_offset, u64 start, u64 end,
73 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
74 struct extent_map *em;
78 em = lookup_extent_mapping(em_tree, start, end);
82 em = alloc_extent_map(GFP_NOFS);
84 em = ERR_PTR(-ENOMEM);
88 em->end = (i_size_read(inode) & ~((u64)PAGE_CACHE_SIZE -1)) - 1;
90 em->block_end = em->end;
91 em->bdev = inode->i_sb->s_bdev;
92 ret = add_extent_mapping(em_tree, em);
104 u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len)
106 return crc32c(seed, data, len);
109 void btrfs_csum_final(u32 crc, char *result)
111 *(__le32 *)result = ~cpu_to_le32(crc);
114 static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
117 char result[BTRFS_CRC32_SIZE];
119 unsigned long cur_len;
120 unsigned long offset = BTRFS_CSUM_SIZE;
121 char *map_token = NULL;
123 unsigned long map_start;
124 unsigned long map_len;
128 len = buf->len - offset;
130 err = map_private_extent_buffer(buf, offset, 32,
132 &map_start, &map_len, KM_USER0);
134 printk("failed to map extent buffer! %lu\n",
138 cur_len = min(len, map_len - (offset - map_start));
139 crc = btrfs_csum_data(root, kaddr + offset - map_start,
143 unmap_extent_buffer(buf, map_token, KM_USER0);
145 btrfs_csum_final(crc, result);
148 if (memcmp_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE)) {
149 printk("btrfs: %s checksum verify failed on %llu\n",
150 root->fs_info->sb->s_id,
155 write_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE);
161 int csum_dirty_buffer(struct btrfs_root *root, struct page *page)
163 struct extent_map_tree *tree;
164 u64 start = (u64)page->index << PAGE_CACHE_SHIFT;
168 struct extent_buffer *eb;
169 tree = &BTRFS_I(page->mapping->host)->extent_tree;
171 if (page->private == EXTENT_PAGE_PRIVATE)
175 len = page->private >> 2;
179 eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS);
180 read_extent_buffer_pages(tree, eb, start + PAGE_CACHE_SIZE, 1);
181 found_start = btrfs_header_bytenr(eb);
182 if (found_start != start) {
183 printk("warning: eb start incorrect %Lu buffer %Lu len %lu\n",
184 start, found_start, len);
186 found_level = btrfs_header_level(eb);
187 csum_tree_block(root, eb, 0);
188 free_extent_buffer(eb);
193 static int btree_writepage_io_hook(struct page *page, u64 start, u64 end)
195 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
197 csum_dirty_buffer(root, page);
201 static int btree_writepage(struct page *page, struct writeback_control *wbc)
203 struct extent_map_tree *tree;
204 tree = &BTRFS_I(page->mapping->host)->extent_tree;
205 return extent_write_full_page(tree, page, btree_get_extent, wbc);
208 static int btree_writepages(struct address_space *mapping,
209 struct writeback_control *wbc)
211 struct extent_map_tree *tree;
212 tree = &BTRFS_I(mapping->host)->extent_tree;
213 if (wbc->sync_mode == WB_SYNC_NONE) {
216 unsigned long thresh = 96 * 1024 * 1024;
218 if (wbc->for_kupdate)
221 if (current_is_pdflush()) {
222 thresh = 96 * 1024 * 1024;
224 thresh = 8 * 1024 * 1024;
226 num_dirty = count_range_bits(tree, &start, thresh, EXTENT_DIRTY);
227 if (num_dirty < thresh) {
231 return extent_writepages(tree, mapping, btree_get_extent, wbc);
234 int btree_readpage(struct file *file, struct page *page)
236 struct extent_map_tree *tree;
237 tree = &BTRFS_I(page->mapping->host)->extent_tree;
238 return extent_read_full_page(tree, page, btree_get_extent);
241 static int btree_releasepage(struct page *page, gfp_t unused_gfp_flags)
243 struct extent_map_tree *tree;
246 tree = &BTRFS_I(page->mapping->host)->extent_tree;
247 ret = try_release_extent_mapping(tree, page);
249 ClearPagePrivate(page);
250 set_page_private(page, 0);
251 page_cache_release(page);
256 static void btree_invalidatepage(struct page *page, unsigned long offset)
258 struct extent_map_tree *tree;
259 tree = &BTRFS_I(page->mapping->host)->extent_tree;
260 extent_invalidatepage(tree, page, offset);
261 btree_releasepage(page, GFP_NOFS);
265 static int btree_writepage(struct page *page, struct writeback_control *wbc)
267 struct buffer_head *bh;
268 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
269 struct buffer_head *head;
270 if (!page_has_buffers(page)) {
271 create_empty_buffers(page, root->fs_info->sb->s_blocksize,
272 (1 << BH_Dirty)|(1 << BH_Uptodate));
274 head = page_buffers(page);
277 if (buffer_dirty(bh))
278 csum_tree_block(root, bh, 0);
279 bh = bh->b_this_page;
280 } while (bh != head);
281 return block_write_full_page(page, btree_get_block, wbc);
285 static struct address_space_operations btree_aops = {
286 .readpage = btree_readpage,
287 .writepage = btree_writepage,
288 .writepages = btree_writepages,
289 .releasepage = btree_releasepage,
290 .invalidatepage = btree_invalidatepage,
291 .sync_page = block_sync_page,
294 int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize)
296 struct extent_buffer *buf = NULL;
297 struct inode *btree_inode = root->fs_info->btree_inode;
300 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
303 read_extent_buffer_pages(&BTRFS_I(btree_inode)->extent_tree,
305 free_extent_buffer(buf);
309 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
312 struct extent_buffer *buf = NULL;
313 struct inode *btree_inode = root->fs_info->btree_inode;
314 struct extent_map_tree *extent_tree;
317 extent_tree = &BTRFS_I(btree_inode)->extent_tree;
319 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
322 read_extent_buffer_pages(&BTRFS_I(btree_inode)->extent_tree,
324 if (buf->flags & EXTENT_CSUM) {
327 if (test_range_bit(extent_tree, buf->start, buf->start + buf->len - 1,
329 buf->flags |= EXTENT_CSUM;
332 ret = csum_tree_block(root, buf, 1);
333 set_extent_bits(extent_tree, buf->start,
334 buf->start + buf->len - 1,
335 EXTENT_CSUM, GFP_NOFS);
336 buf->flags |= EXTENT_CSUM;
340 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
341 struct extent_buffer *buf)
343 struct inode *btree_inode = root->fs_info->btree_inode;
344 clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, buf);
348 int wait_on_tree_block_writeback(struct btrfs_root *root,
349 struct extent_buffer *buf)
351 struct inode *btree_inode = root->fs_info->btree_inode;
352 wait_on_extent_buffer_writeback(&BTRFS_I(btree_inode)->extent_tree,
357 static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
358 struct btrfs_root *root,
359 struct btrfs_fs_info *fs_info,
364 root->commit_root = NULL;
365 root->sectorsize = sectorsize;
366 root->nodesize = nodesize;
367 root->leafsize = leafsize;
369 root->fs_info = fs_info;
370 root->objectid = objectid;
371 root->last_trans = 0;
372 root->highest_inode = 0;
373 root->last_inode_alloc = 0;
375 memset(&root->root_key, 0, sizeof(root->root_key));
376 memset(&root->root_item, 0, sizeof(root->root_item));
377 memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
378 memset(&root->root_kobj, 0, sizeof(root->root_kobj));
379 init_completion(&root->kobj_unregister);
380 init_rwsem(&root->snap_sem);
381 root->defrag_running = 0;
382 root->defrag_level = 0;
383 root->root_key.objectid = objectid;
387 static int find_and_setup_root(struct btrfs_root *tree_root,
388 struct btrfs_fs_info *fs_info,
390 struct btrfs_root *root)
395 __setup_root(tree_root->nodesize, tree_root->leafsize,
396 tree_root->sectorsize, root, fs_info, objectid);
397 ret = btrfs_find_last_root(tree_root, objectid,
398 &root->root_item, &root->root_key);
401 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
402 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
408 struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_fs_info *fs_info,
409 struct btrfs_key *location)
411 struct btrfs_root *root;
412 struct btrfs_root *tree_root = fs_info->tree_root;
413 struct btrfs_path *path;
414 struct extent_buffer *l;
419 root = kzalloc(sizeof(*root), GFP_NOFS);
421 return ERR_PTR(-ENOMEM);
422 if (location->offset == (u64)-1) {
423 ret = find_and_setup_root(tree_root, fs_info,
424 location->objectid, root);
432 __setup_root(tree_root->nodesize, tree_root->leafsize,
433 tree_root->sectorsize, root, fs_info,
436 path = btrfs_alloc_path();
438 ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
445 read_extent_buffer(l, &root->root_item,
446 btrfs_item_ptr_offset(l, path->slots[0]),
447 sizeof(root->root_item));
448 memcpy(&root->root_key, location, sizeof(*location));
451 btrfs_release_path(root, path);
452 btrfs_free_path(path);
457 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
458 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
463 ret = btrfs_find_highest_inode(root, &highest_inode);
465 root->highest_inode = highest_inode;
466 root->last_inode_alloc = highest_inode;
471 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
472 struct btrfs_key *location,
473 const char *name, int namelen)
475 struct btrfs_root *root;
478 root = radix_tree_lookup(&fs_info->fs_roots_radix,
479 (unsigned long)location->objectid);
483 root = btrfs_read_fs_root_no_radix(fs_info, location);
486 ret = radix_tree_insert(&fs_info->fs_roots_radix,
487 (unsigned long)root->root_key.objectid,
490 free_extent_buffer(root->node);
495 ret = btrfs_set_root_name(root, name, namelen);
497 free_extent_buffer(root->node);
502 ret = btrfs_sysfs_add_root(root);
504 free_extent_buffer(root->node);
510 ret = btrfs_find_dead_roots(fs_info->tree_root,
511 root->root_key.objectid, root);
517 static int add_hasher(struct btrfs_fs_info *info, char *type) {
518 struct btrfs_hasher *hasher;
520 hasher = kmalloc(sizeof(*hasher), GFP_NOFS);
523 hasher->hash_tfm = crypto_alloc_hash(type, 0, CRYPTO_ALG_ASYNC);
524 if (!hasher->hash_tfm) {
528 spin_lock(&info->hash_lock);
529 list_add(&hasher->list, &info->hashers);
530 spin_unlock(&info->hash_lock);
534 struct btrfs_root *open_ctree(struct super_block *sb)
540 struct btrfs_root *extent_root = kmalloc(sizeof(struct btrfs_root),
542 struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root),
544 struct btrfs_fs_info *fs_info = kmalloc(sizeof(*fs_info),
548 struct btrfs_super_block *disk_super;
550 if (!extent_root || !tree_root || !fs_info) {
554 INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_NOFS);
555 INIT_LIST_HEAD(&fs_info->trans_list);
556 INIT_LIST_HEAD(&fs_info->dead_roots);
557 INIT_LIST_HEAD(&fs_info->hashers);
558 spin_lock_init(&fs_info->hash_lock);
560 memset(&fs_info->super_kobj, 0, sizeof(fs_info->super_kobj));
561 init_completion(&fs_info->kobj_unregister);
562 sb_set_blocksize(sb, 4096);
563 fs_info->running_transaction = NULL;
564 fs_info->last_trans_committed = 0;
565 fs_info->tree_root = tree_root;
566 fs_info->extent_root = extent_root;
568 fs_info->btree_inode = new_inode(sb);
569 fs_info->btree_inode->i_ino = 1;
570 fs_info->btree_inode->i_nlink = 1;
571 fs_info->btree_inode->i_size = sb->s_bdev->bd_inode->i_size;
572 fs_info->btree_inode->i_mapping->a_ops = &btree_aops;
573 extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree,
574 fs_info->btree_inode->i_mapping,
576 BTRFS_I(fs_info->btree_inode)->extent_tree.ops = &btree_extent_map_ops;
578 extent_map_tree_init(&fs_info->free_space_cache,
579 fs_info->btree_inode->i_mapping, GFP_NOFS);
580 extent_map_tree_init(&fs_info->block_group_cache,
581 fs_info->btree_inode->i_mapping, GFP_NOFS);
582 extent_map_tree_init(&fs_info->pinned_extents,
583 fs_info->btree_inode->i_mapping, GFP_NOFS);
584 extent_map_tree_init(&fs_info->pending_del,
585 fs_info->btree_inode->i_mapping, GFP_NOFS);
586 extent_map_tree_init(&fs_info->extent_ins,
587 fs_info->btree_inode->i_mapping, GFP_NOFS);
588 fs_info->do_barriers = 1;
589 fs_info->closing = 0;
590 fs_info->total_pinned = 0;
592 INIT_DELAYED_WORK(&fs_info->trans_work, btrfs_transaction_cleaner);
593 BTRFS_I(fs_info->btree_inode)->root = tree_root;
594 memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
595 sizeof(struct btrfs_key));
596 insert_inode_hash(fs_info->btree_inode);
597 mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
599 mutex_init(&fs_info->trans_mutex);
600 mutex_init(&fs_info->fs_mutex);
603 ret = add_hasher(fs_info, "crc32c");
605 printk("btrfs: failed hash setup, modprobe cryptomgr?\n");
610 __setup_root(512, 512, 512, tree_root,
611 fs_info, BTRFS_ROOT_TREE_OBJECTID);
613 fs_info->sb_buffer = read_tree_block(tree_root,
614 BTRFS_SUPER_INFO_OFFSET,
617 if (!fs_info->sb_buffer)
620 read_extent_buffer(fs_info->sb_buffer, &fs_info->super_copy, 0,
621 sizeof(fs_info->super_copy));
623 read_extent_buffer(fs_info->sb_buffer, fs_info->fsid,
624 (unsigned long)btrfs_super_fsid(fs_info->sb_buffer),
626 disk_super = &fs_info->super_copy;
627 if (!btrfs_super_root(disk_super))
630 nodesize = btrfs_super_nodesize(disk_super);
631 leafsize = btrfs_super_leafsize(disk_super);
632 sectorsize = btrfs_super_sectorsize(disk_super);
633 tree_root->nodesize = nodesize;
634 tree_root->leafsize = leafsize;
635 tree_root->sectorsize = sectorsize;
636 sb_set_blocksize(sb, sectorsize);
638 i_size_write(fs_info->btree_inode,
639 btrfs_super_total_bytes(disk_super));
641 if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
642 sizeof(disk_super->magic))) {
643 printk("btrfs: valid FS not found on %s\n", sb->s_id);
647 blocksize = btrfs_level_size(tree_root,
648 btrfs_super_root_level(disk_super));
650 tree_root->node = read_tree_block(tree_root,
651 btrfs_super_root(disk_super),
653 if (!tree_root->node)
656 mutex_lock(&fs_info->fs_mutex);
658 ret = find_and_setup_root(tree_root, fs_info,
659 BTRFS_EXTENT_TREE_OBJECTID, extent_root);
661 mutex_unlock(&fs_info->fs_mutex);
665 btrfs_read_block_groups(extent_root);
667 fs_info->generation = btrfs_super_generation(disk_super) + 1;
668 mutex_unlock(&fs_info->fs_mutex);
672 free_extent_buffer(tree_root->node);
674 free_extent_buffer(fs_info->sb_buffer);
676 iput(fs_info->btree_inode);
684 int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
688 struct extent_buffer *super = root->fs_info->sb_buffer;
689 struct inode *btree_inode = root->fs_info->btree_inode;
691 set_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, super);
692 ret = sync_page_range_nolock(btree_inode, btree_inode->i_mapping,
693 super->start, super->len);
697 int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
699 radix_tree_delete(&fs_info->fs_roots_radix,
700 (unsigned long)root->root_key.objectid);
701 btrfs_sysfs_del_root(root);
705 free_extent_buffer(root->node);
706 if (root->commit_root)
707 free_extent_buffer(root->commit_root);
714 static int del_fs_roots(struct btrfs_fs_info *fs_info)
717 struct btrfs_root *gang[8];
721 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
726 for (i = 0; i < ret; i++)
727 btrfs_free_fs_root(fs_info, gang[i]);
732 int close_ctree(struct btrfs_root *root)
735 struct btrfs_trans_handle *trans;
736 struct btrfs_fs_info *fs_info = root->fs_info;
738 fs_info->closing = 1;
739 btrfs_transaction_flush_work(root);
740 mutex_lock(&fs_info->fs_mutex);
741 btrfs_defrag_dirty_roots(root->fs_info);
742 trans = btrfs_start_transaction(root, 1);
743 ret = btrfs_commit_transaction(trans, root);
744 /* run commit again to drop the original snapshot */
745 trans = btrfs_start_transaction(root, 1);
746 btrfs_commit_transaction(trans, root);
747 ret = btrfs_write_and_wait_transaction(NULL, root);
749 write_ctree_super(NULL, root);
750 mutex_unlock(&fs_info->fs_mutex);
752 if (fs_info->extent_root->node)
753 free_extent_buffer(fs_info->extent_root->node);
755 if (fs_info->tree_root->node)
756 free_extent_buffer(fs_info->tree_root->node);
758 free_extent_buffer(fs_info->sb_buffer);
760 btrfs_free_block_groups(root->fs_info);
761 del_fs_roots(fs_info);
762 extent_map_tree_empty_lru(&BTRFS_I(fs_info->btree_inode)->extent_tree);
763 truncate_inode_pages(fs_info->btree_inode->i_mapping, 0);
764 iput(fs_info->btree_inode);
766 while(!list_empty(&fs_info->hashers)) {
767 struct btrfs_hasher *hasher;
768 hasher = list_entry(fs_info->hashers.next, struct btrfs_hasher,
770 list_del(&hasher->hashers);
771 crypto_free_hash(&fs_info->hash_tfm);
775 kfree(fs_info->extent_root);
776 kfree(fs_info->tree_root);
780 int btrfs_buffer_uptodate(struct extent_buffer *buf)
782 struct inode *btree_inode = buf->first_page->mapping->host;
783 return extent_buffer_uptodate(&BTRFS_I(btree_inode)->extent_tree, buf);
786 int btrfs_set_buffer_uptodate(struct extent_buffer *buf)
788 struct inode *btree_inode = buf->first_page->mapping->host;
789 return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->extent_tree,
793 void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
795 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
796 u64 transid = btrfs_header_generation(buf);
797 struct inode *btree_inode = root->fs_info->btree_inode;
799 if (transid != root->fs_info->generation) {
800 printk(KERN_CRIT "transid mismatch buffer %llu, found %Lu running %Lu\n",
801 (unsigned long long)buf->start,
802 transid, root->fs_info->generation);
805 set_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, buf);
808 void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
810 balance_dirty_pages_ratelimited_nr(
811 root->fs_info->btree_inode->i_mapping, 1);
814 void btrfs_set_buffer_defrag(struct extent_buffer *buf)
816 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
817 struct inode *btree_inode = root->fs_info->btree_inode;
818 set_extent_bits(&BTRFS_I(btree_inode)->extent_tree, buf->start,
819 buf->start + buf->len - 1, EXTENT_DEFRAG, GFP_NOFS);
822 void btrfs_set_buffer_defrag_done(struct extent_buffer *buf)
824 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
825 struct inode *btree_inode = root->fs_info->btree_inode;
826 set_extent_bits(&BTRFS_I(btree_inode)->extent_tree, buf->start,
827 buf->start + buf->len - 1, EXTENT_DEFRAG_DONE,
831 int btrfs_buffer_defrag(struct extent_buffer *buf)
833 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
834 struct inode *btree_inode = root->fs_info->btree_inode;
835 return test_range_bit(&BTRFS_I(btree_inode)->extent_tree,
836 buf->start, buf->start + buf->len - 1, EXTENT_DEFRAG, 0);
839 int btrfs_buffer_defrag_done(struct extent_buffer *buf)
841 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
842 struct inode *btree_inode = root->fs_info->btree_inode;
843 return test_range_bit(&BTRFS_I(btree_inode)->extent_tree,
844 buf->start, buf->start + buf->len - 1,
845 EXTENT_DEFRAG_DONE, 0);
848 int btrfs_clear_buffer_defrag_done(struct extent_buffer *buf)
850 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
851 struct inode *btree_inode = root->fs_info->btree_inode;
852 return clear_extent_bits(&BTRFS_I(btree_inode)->extent_tree,
853 buf->start, buf->start + buf->len - 1,
854 EXTENT_DEFRAG_DONE, GFP_NOFS);
857 int btrfs_clear_buffer_defrag(struct extent_buffer *buf)
859 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
860 struct inode *btree_inode = root->fs_info->btree_inode;
861 return clear_extent_bits(&BTRFS_I(btree_inode)->extent_tree,
862 buf->start, buf->start + buf->len - 1,
863 EXTENT_DEFRAG, GFP_NOFS);
866 int btrfs_read_buffer(struct extent_buffer *buf)
868 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
869 struct inode *btree_inode = root->fs_info->btree_inode;
870 return read_extent_buffer_pages(&BTRFS_I(btree_inode)->extent_tree,
874 static struct extent_map_ops btree_extent_map_ops = {
875 .writepage_io_hook = btree_writepage_io_hook,