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 int from_this_trans = 0;
150 if (root->fs_info->running_transaction &&
151 btrfs_header_generation(buf) ==
152 root->fs_info->running_transaction->transid)
155 /* FIXME, this is not good */
156 if (from_this_trans == 0 &&
157 memcmp_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE)) {
160 memcpy(&found, result, BTRFS_CRC32_SIZE);
162 read_extent_buffer(buf, &val, 0, BTRFS_CRC32_SIZE);
163 printk("btrfs: %s checksum verify failed on %llu "
164 "wanted %X found %X from_this_trans %d\n",
165 root->fs_info->sb->s_id,
166 buf->start, val, found, from_this_trans);
170 write_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE);
176 int csum_dirty_buffer(struct btrfs_root *root, struct page *page)
178 struct extent_map_tree *tree;
179 u64 start = (u64)page->index << PAGE_CACHE_SHIFT;
183 struct extent_buffer *eb;
184 tree = &BTRFS_I(page->mapping->host)->extent_tree;
186 if (page->private == EXTENT_PAGE_PRIVATE)
190 len = page->private >> 2;
194 eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS);
195 read_extent_buffer_pages(tree, eb, start + PAGE_CACHE_SIZE, 1);
196 btrfs_clear_buffer_defrag(eb);
197 found_start = btrfs_header_bytenr(eb);
198 if (found_start != start) {
199 printk("warning: eb start incorrect %Lu buffer %Lu len %lu\n",
200 start, found_start, len);
204 if (eb->first_page != page) {
205 printk("bad first page %lu %lu\n", eb->first_page->index,
210 if (!PageUptodate(page)) {
211 printk("csum not up to date page %lu\n", page->index);
215 found_level = btrfs_header_level(eb);
216 csum_tree_block(root, eb, 0);
218 free_extent_buffer(eb);
223 static int btree_writepage_io_hook(struct page *page, u64 start, u64 end)
225 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
227 csum_dirty_buffer(root, page);
231 static int btree_writepage(struct page *page, struct writeback_control *wbc)
233 struct extent_map_tree *tree;
234 tree = &BTRFS_I(page->mapping->host)->extent_tree;
235 return extent_write_full_page(tree, page, btree_get_extent, wbc);
238 static int btree_writepages(struct address_space *mapping,
239 struct writeback_control *wbc)
241 struct extent_map_tree *tree;
242 tree = &BTRFS_I(mapping->host)->extent_tree;
243 if (wbc->sync_mode == WB_SYNC_NONE) {
246 unsigned long thresh = 96 * 1024 * 1024;
248 if (wbc->for_kupdate)
251 if (current_is_pdflush()) {
252 thresh = 96 * 1024 * 1024;
254 thresh = 8 * 1024 * 1024;
256 num_dirty = count_range_bits(tree, &start, (u64)-1,
257 thresh, EXTENT_DIRTY);
258 if (num_dirty < thresh) {
262 return extent_writepages(tree, mapping, btree_get_extent, wbc);
265 int btree_readpage(struct file *file, struct page *page)
267 struct extent_map_tree *tree;
268 tree = &BTRFS_I(page->mapping->host)->extent_tree;
269 return extent_read_full_page(tree, page, btree_get_extent);
272 static int btree_releasepage(struct page *page, gfp_t unused_gfp_flags)
274 struct extent_map_tree *tree;
277 tree = &BTRFS_I(page->mapping->host)->extent_tree;
278 ret = try_release_extent_mapping(tree, page);
280 ClearPagePrivate(page);
281 set_page_private(page, 0);
282 page_cache_release(page);
287 static void btree_invalidatepage(struct page *page, unsigned long offset)
289 struct extent_map_tree *tree;
290 tree = &BTRFS_I(page->mapping->host)->extent_tree;
291 extent_invalidatepage(tree, page, offset);
292 btree_releasepage(page, GFP_NOFS);
296 static int btree_writepage(struct page *page, struct writeback_control *wbc)
298 struct buffer_head *bh;
299 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
300 struct buffer_head *head;
301 if (!page_has_buffers(page)) {
302 create_empty_buffers(page, root->fs_info->sb->s_blocksize,
303 (1 << BH_Dirty)|(1 << BH_Uptodate));
305 head = page_buffers(page);
308 if (buffer_dirty(bh))
309 csum_tree_block(root, bh, 0);
310 bh = bh->b_this_page;
311 } while (bh != head);
312 return block_write_full_page(page, btree_get_block, wbc);
316 static struct address_space_operations btree_aops = {
317 .readpage = btree_readpage,
318 .writepage = btree_writepage,
319 .writepages = btree_writepages,
320 .releasepage = btree_releasepage,
321 .invalidatepage = btree_invalidatepage,
322 .sync_page = block_sync_page,
325 int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize)
327 struct extent_buffer *buf = NULL;
328 struct inode *btree_inode = root->fs_info->btree_inode;
331 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
334 read_extent_buffer_pages(&BTRFS_I(btree_inode)->extent_tree,
336 free_extent_buffer(buf);
340 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
343 struct extent_buffer *buf = NULL;
344 struct inode *btree_inode = root->fs_info->btree_inode;
345 struct extent_map_tree *extent_tree;
349 extent_tree = &BTRFS_I(btree_inode)->extent_tree;
351 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
354 read_extent_buffer_pages(&BTRFS_I(btree_inode)->extent_tree,
357 if (buf->flags & EXTENT_CSUM)
360 end = buf->start + PAGE_CACHE_SIZE - 1;
361 if (test_range_bit(extent_tree, buf->start, end, EXTENT_CSUM, 1)) {
362 buf->flags |= EXTENT_CSUM;
366 lock_extent(extent_tree, buf->start, end, GFP_NOFS);
368 if (test_range_bit(extent_tree, buf->start, end, EXTENT_CSUM, 1)) {
369 buf->flags |= EXTENT_CSUM;
373 ret = csum_tree_block(root, buf, 1);
374 set_extent_bits(extent_tree, buf->start, end, EXTENT_CSUM, GFP_NOFS);
375 buf->flags |= EXTENT_CSUM;
378 unlock_extent(extent_tree, buf->start, end, GFP_NOFS);
382 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
383 struct extent_buffer *buf)
385 struct inode *btree_inode = root->fs_info->btree_inode;
386 if (btrfs_header_generation(buf) ==
387 root->fs_info->running_transaction->transid)
388 clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree,
393 int wait_on_tree_block_writeback(struct btrfs_root *root,
394 struct extent_buffer *buf)
396 struct inode *btree_inode = root->fs_info->btree_inode;
397 wait_on_extent_buffer_writeback(&BTRFS_I(btree_inode)->extent_tree,
402 static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
403 u32 stripesize, struct btrfs_root *root,
404 struct btrfs_fs_info *fs_info,
409 root->commit_root = NULL;
410 root->sectorsize = sectorsize;
411 root->nodesize = nodesize;
412 root->leafsize = leafsize;
413 root->stripesize = stripesize;
415 root->fs_info = fs_info;
416 root->objectid = objectid;
417 root->last_trans = 0;
418 root->highest_inode = 0;
419 root->last_inode_alloc = 0;
422 memset(&root->root_key, 0, sizeof(root->root_key));
423 memset(&root->root_item, 0, sizeof(root->root_item));
424 memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
425 memset(&root->root_kobj, 0, sizeof(root->root_kobj));
426 init_completion(&root->kobj_unregister);
427 root->defrag_running = 0;
428 root->defrag_level = 0;
429 root->root_key.objectid = objectid;
433 static int find_and_setup_root(struct btrfs_root *tree_root,
434 struct btrfs_fs_info *fs_info,
436 struct btrfs_root *root)
441 __setup_root(tree_root->nodesize, tree_root->leafsize,
442 tree_root->sectorsize, tree_root->stripesize,
443 root, fs_info, objectid);
444 ret = btrfs_find_last_root(tree_root, objectid,
445 &root->root_item, &root->root_key);
448 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
449 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
455 struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_fs_info *fs_info,
456 struct btrfs_key *location)
458 struct btrfs_root *root;
459 struct btrfs_root *tree_root = fs_info->tree_root;
460 struct btrfs_path *path;
461 struct extent_buffer *l;
466 root = kzalloc(sizeof(*root), GFP_NOFS);
468 return ERR_PTR(-ENOMEM);
469 if (location->offset == (u64)-1) {
470 ret = find_and_setup_root(tree_root, fs_info,
471 location->objectid, root);
479 __setup_root(tree_root->nodesize, tree_root->leafsize,
480 tree_root->sectorsize, tree_root->stripesize,
481 root, fs_info, location->objectid);
483 path = btrfs_alloc_path();
485 ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
492 read_extent_buffer(l, &root->root_item,
493 btrfs_item_ptr_offset(l, path->slots[0]),
494 sizeof(root->root_item));
495 memcpy(&root->root_key, location, sizeof(*location));
498 btrfs_release_path(root, path);
499 btrfs_free_path(path);
504 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
505 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
510 ret = btrfs_find_highest_inode(root, &highest_inode);
512 root->highest_inode = highest_inode;
513 root->last_inode_alloc = highest_inode;
518 struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
521 struct btrfs_root *root;
523 if (root_objectid == BTRFS_ROOT_TREE_OBJECTID)
524 return fs_info->tree_root;
525 if (root_objectid == BTRFS_EXTENT_TREE_OBJECTID)
526 return fs_info->extent_root;
528 root = radix_tree_lookup(&fs_info->fs_roots_radix,
529 (unsigned long)root_objectid);
533 struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
534 struct btrfs_key *location)
536 struct btrfs_root *root;
539 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
540 return fs_info->tree_root;
541 if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
542 return fs_info->extent_root;
544 root = radix_tree_lookup(&fs_info->fs_roots_radix,
545 (unsigned long)location->objectid);
549 root = btrfs_read_fs_root_no_radix(fs_info, location);
552 ret = radix_tree_insert(&fs_info->fs_roots_radix,
553 (unsigned long)root->root_key.objectid,
556 free_extent_buffer(root->node);
560 ret = btrfs_find_dead_roots(fs_info->tree_root,
561 root->root_key.objectid, root);
567 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
568 struct btrfs_key *location,
569 const char *name, int namelen)
571 struct btrfs_root *root;
574 root = btrfs_read_fs_root_no_name(fs_info, location);
581 ret = btrfs_set_root_name(root, name, namelen);
583 free_extent_buffer(root->node);
588 ret = btrfs_sysfs_add_root(root);
590 free_extent_buffer(root->node);
599 static int add_hasher(struct btrfs_fs_info *info, char *type) {
600 struct btrfs_hasher *hasher;
602 hasher = kmalloc(sizeof(*hasher), GFP_NOFS);
605 hasher->hash_tfm = crypto_alloc_hash(type, 0, CRYPTO_ALG_ASYNC);
606 if (!hasher->hash_tfm) {
610 spin_lock(&info->hash_lock);
611 list_add(&hasher->list, &info->hashers);
612 spin_unlock(&info->hash_lock);
616 struct btrfs_root *open_ctree(struct super_block *sb)
623 struct btrfs_root *extent_root = kmalloc(sizeof(struct btrfs_root),
625 struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root),
627 struct btrfs_fs_info *fs_info = kmalloc(sizeof(*fs_info),
631 struct btrfs_super_block *disk_super;
633 if (!extent_root || !tree_root || !fs_info) {
637 INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_NOFS);
638 INIT_LIST_HEAD(&fs_info->trans_list);
639 INIT_LIST_HEAD(&fs_info->dead_roots);
640 INIT_LIST_HEAD(&fs_info->hashers);
641 spin_lock_init(&fs_info->hash_lock);
642 spin_lock_init(&fs_info->delalloc_lock);
643 spin_lock_init(&fs_info->new_trans_lock);
645 memset(&fs_info->super_kobj, 0, sizeof(fs_info->super_kobj));
646 init_completion(&fs_info->kobj_unregister);
647 sb_set_blocksize(sb, 4096);
648 fs_info->running_transaction = NULL;
649 fs_info->last_trans_committed = 0;
650 fs_info->tree_root = tree_root;
651 fs_info->extent_root = extent_root;
653 fs_info->throttles = 0;
654 fs_info->mount_opt = 0;
655 fs_info->max_extent = (u64)-1;
656 fs_info->delalloc_bytes = 0;
657 fs_info->btree_inode = new_inode(sb);
658 fs_info->btree_inode->i_ino = 1;
659 fs_info->btree_inode->i_nlink = 1;
660 fs_info->btree_inode->i_size = sb->s_bdev->bd_inode->i_size;
661 fs_info->btree_inode->i_mapping->a_ops = &btree_aops;
662 extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree,
663 fs_info->btree_inode->i_mapping,
665 BTRFS_I(fs_info->btree_inode)->extent_tree.ops = &btree_extent_map_ops;
667 extent_map_tree_init(&fs_info->free_space_cache,
668 fs_info->btree_inode->i_mapping, GFP_NOFS);
669 extent_map_tree_init(&fs_info->block_group_cache,
670 fs_info->btree_inode->i_mapping, GFP_NOFS);
671 extent_map_tree_init(&fs_info->pinned_extents,
672 fs_info->btree_inode->i_mapping, GFP_NOFS);
673 extent_map_tree_init(&fs_info->pending_del,
674 fs_info->btree_inode->i_mapping, GFP_NOFS);
675 extent_map_tree_init(&fs_info->extent_ins,
676 fs_info->btree_inode->i_mapping, GFP_NOFS);
677 fs_info->do_barriers = 1;
678 fs_info->closing = 0;
679 fs_info->total_pinned = 0;
680 fs_info->last_alloc = 0;
682 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
683 INIT_WORK(&fs_info->trans_work, btrfs_transaction_cleaner, fs_info);
685 INIT_DELAYED_WORK(&fs_info->trans_work, btrfs_transaction_cleaner);
687 BTRFS_I(fs_info->btree_inode)->root = tree_root;
688 memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
689 sizeof(struct btrfs_key));
690 insert_inode_hash(fs_info->btree_inode);
691 mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
693 mutex_init(&fs_info->trans_mutex);
694 mutex_init(&fs_info->fs_mutex);
697 ret = add_hasher(fs_info, "crc32c");
699 printk("btrfs: failed hash setup, modprobe cryptomgr?\n");
704 __setup_root(512, 512, 512, 512, tree_root,
705 fs_info, BTRFS_ROOT_TREE_OBJECTID);
707 fs_info->sb_buffer = read_tree_block(tree_root,
708 BTRFS_SUPER_INFO_OFFSET,
711 if (!fs_info->sb_buffer)
714 read_extent_buffer(fs_info->sb_buffer, &fs_info->super_copy, 0,
715 sizeof(fs_info->super_copy));
717 read_extent_buffer(fs_info->sb_buffer, fs_info->fsid,
718 (unsigned long)btrfs_super_fsid(fs_info->sb_buffer),
720 disk_super = &fs_info->super_copy;
721 if (!btrfs_super_root(disk_super))
724 nodesize = btrfs_super_nodesize(disk_super);
725 leafsize = btrfs_super_leafsize(disk_super);
726 sectorsize = btrfs_super_sectorsize(disk_super);
727 stripesize = btrfs_super_stripesize(disk_super);
728 tree_root->nodesize = nodesize;
729 tree_root->leafsize = leafsize;
730 tree_root->sectorsize = sectorsize;
731 tree_root->stripesize = stripesize;
732 sb_set_blocksize(sb, sectorsize);
734 i_size_write(fs_info->btree_inode,
735 btrfs_super_total_bytes(disk_super));
737 if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
738 sizeof(disk_super->magic))) {
739 printk("btrfs: valid FS not found on %s\n", sb->s_id);
743 blocksize = btrfs_level_size(tree_root,
744 btrfs_super_root_level(disk_super));
746 tree_root->node = read_tree_block(tree_root,
747 btrfs_super_root(disk_super),
749 if (!tree_root->node)
752 mutex_lock(&fs_info->fs_mutex);
754 ret = find_and_setup_root(tree_root, fs_info,
755 BTRFS_EXTENT_TREE_OBJECTID, extent_root);
757 mutex_unlock(&fs_info->fs_mutex);
761 btrfs_read_block_groups(extent_root);
763 fs_info->generation = btrfs_super_generation(disk_super) + 1;
764 mutex_unlock(&fs_info->fs_mutex);
768 free_extent_buffer(tree_root->node);
770 free_extent_buffer(fs_info->sb_buffer);
772 iput(fs_info->btree_inode);
780 int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
784 struct extent_buffer *super = root->fs_info->sb_buffer;
785 struct inode *btree_inode = root->fs_info->btree_inode;
786 struct super_block *sb = root->fs_info->sb;
788 if (!btrfs_test_opt(root, NOBARRIER))
789 blkdev_issue_flush(sb->s_bdev, NULL);
790 set_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, super);
791 ret = sync_page_range_nolock(btree_inode, btree_inode->i_mapping,
792 super->start, super->len);
793 if (!btrfs_test_opt(root, NOBARRIER))
794 blkdev_issue_flush(sb->s_bdev, NULL);
798 int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
800 radix_tree_delete(&fs_info->fs_roots_radix,
801 (unsigned long)root->root_key.objectid);
803 btrfs_sysfs_del_root(root);
807 free_extent_buffer(root->node);
808 if (root->commit_root)
809 free_extent_buffer(root->commit_root);
816 static int del_fs_roots(struct btrfs_fs_info *fs_info)
819 struct btrfs_root *gang[8];
823 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
828 for (i = 0; i < ret; i++)
829 btrfs_free_fs_root(fs_info, gang[i]);
834 int close_ctree(struct btrfs_root *root)
837 struct btrfs_trans_handle *trans;
838 struct btrfs_fs_info *fs_info = root->fs_info;
840 fs_info->closing = 1;
841 btrfs_transaction_flush_work(root);
842 mutex_lock(&fs_info->fs_mutex);
843 btrfs_defrag_dirty_roots(root->fs_info);
844 trans = btrfs_start_transaction(root, 1);
845 ret = btrfs_commit_transaction(trans, root);
846 /* run commit again to drop the original snapshot */
847 trans = btrfs_start_transaction(root, 1);
848 btrfs_commit_transaction(trans, root);
849 ret = btrfs_write_and_wait_transaction(NULL, root);
851 write_ctree_super(NULL, root);
852 mutex_unlock(&fs_info->fs_mutex);
854 if (fs_info->extent_root->node)
855 free_extent_buffer(fs_info->extent_root->node);
857 if (fs_info->tree_root->node)
858 free_extent_buffer(fs_info->tree_root->node);
860 free_extent_buffer(fs_info->sb_buffer);
862 btrfs_free_block_groups(root->fs_info);
863 del_fs_roots(fs_info);
865 filemap_write_and_wait(fs_info->btree_inode->i_mapping);
867 extent_map_tree_empty_lru(&fs_info->free_space_cache);
868 extent_map_tree_empty_lru(&fs_info->block_group_cache);
869 extent_map_tree_empty_lru(&fs_info->pinned_extents);
870 extent_map_tree_empty_lru(&fs_info->pending_del);
871 extent_map_tree_empty_lru(&fs_info->extent_ins);
872 extent_map_tree_empty_lru(&BTRFS_I(fs_info->btree_inode)->extent_tree);
874 truncate_inode_pages(fs_info->btree_inode->i_mapping, 0);
876 iput(fs_info->btree_inode);
878 while(!list_empty(&fs_info->hashers)) {
879 struct btrfs_hasher *hasher;
880 hasher = list_entry(fs_info->hashers.next, struct btrfs_hasher,
882 list_del(&hasher->hashers);
883 crypto_free_hash(&fs_info->hash_tfm);
887 kfree(fs_info->extent_root);
888 kfree(fs_info->tree_root);
892 int btrfs_buffer_uptodate(struct extent_buffer *buf)
894 struct inode *btree_inode = buf->first_page->mapping->host;
895 return extent_buffer_uptodate(&BTRFS_I(btree_inode)->extent_tree, buf);
898 int btrfs_set_buffer_uptodate(struct extent_buffer *buf)
900 struct inode *btree_inode = buf->first_page->mapping->host;
901 return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->extent_tree,
905 void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
907 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
908 u64 transid = btrfs_header_generation(buf);
909 struct inode *btree_inode = root->fs_info->btree_inode;
911 if (transid != root->fs_info->generation) {
912 printk(KERN_CRIT "transid mismatch buffer %llu, found %Lu running %Lu\n",
913 (unsigned long long)buf->start,
914 transid, root->fs_info->generation);
917 set_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, buf);
920 void btrfs_throttle(struct btrfs_root *root)
922 struct backing_dev_info *bdi;
924 bdi = root->fs_info->sb->s_bdev->bd_inode->i_mapping->backing_dev_info;
925 if (root->fs_info->throttles && bdi_write_congested(bdi)) {
926 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18)
927 congestion_wait(WRITE, HZ/20);
929 blk_congestion_wait(WRITE, HZ/20);
934 void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
936 balance_dirty_pages_ratelimited_nr(
937 root->fs_info->btree_inode->i_mapping, 1);
940 void btrfs_set_buffer_defrag(struct extent_buffer *buf)
942 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
943 struct inode *btree_inode = root->fs_info->btree_inode;
944 set_extent_bits(&BTRFS_I(btree_inode)->extent_tree, buf->start,
945 buf->start + buf->len - 1, EXTENT_DEFRAG, GFP_NOFS);
948 void btrfs_set_buffer_defrag_done(struct extent_buffer *buf)
950 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
951 struct inode *btree_inode = root->fs_info->btree_inode;
952 set_extent_bits(&BTRFS_I(btree_inode)->extent_tree, buf->start,
953 buf->start + buf->len - 1, EXTENT_DEFRAG_DONE,
957 int btrfs_buffer_defrag(struct extent_buffer *buf)
959 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
960 struct inode *btree_inode = root->fs_info->btree_inode;
961 return test_range_bit(&BTRFS_I(btree_inode)->extent_tree,
962 buf->start, buf->start + buf->len - 1, EXTENT_DEFRAG, 0);
965 int btrfs_buffer_defrag_done(struct extent_buffer *buf)
967 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
968 struct inode *btree_inode = root->fs_info->btree_inode;
969 return test_range_bit(&BTRFS_I(btree_inode)->extent_tree,
970 buf->start, buf->start + buf->len - 1,
971 EXTENT_DEFRAG_DONE, 0);
974 int btrfs_clear_buffer_defrag_done(struct extent_buffer *buf)
976 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
977 struct inode *btree_inode = root->fs_info->btree_inode;
978 return clear_extent_bits(&BTRFS_I(btree_inode)->extent_tree,
979 buf->start, buf->start + buf->len - 1,
980 EXTENT_DEFRAG_DONE, GFP_NOFS);
983 int btrfs_clear_buffer_defrag(struct extent_buffer *buf)
985 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
986 struct inode *btree_inode = root->fs_info->btree_inode;
987 return clear_extent_bits(&BTRFS_I(btree_inode)->extent_tree,
988 buf->start, buf->start + buf->len - 1,
989 EXTENT_DEFRAG, GFP_NOFS);
992 int btrfs_read_buffer(struct extent_buffer *buf)
994 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
995 struct inode *btree_inode = root->fs_info->btree_inode;
996 return read_extent_buffer_pages(&BTRFS_I(btree_inode)->extent_tree,
1000 static struct extent_map_ops btree_extent_map_ops = {
1001 .writepage_io_hook = btree_writepage_io_hook,