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 found_start = btrfs_header_bytenr(eb);
197 if (found_start != start) {
198 printk("warning: eb start incorrect %Lu buffer %Lu len %lu\n",
199 start, found_start, len);
203 if (eb->first_page != page) {
204 printk("bad first page %lu %lu\n", eb->first_page->index,
209 if (!PageUptodate(page)) {
210 printk("csum not up to date page %lu\n", page->index);
214 found_level = btrfs_header_level(eb);
215 csum_tree_block(root, eb, 0);
217 free_extent_buffer(eb);
222 static int btree_writepage_io_hook(struct page *page, u64 start, u64 end)
224 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
226 csum_dirty_buffer(root, page);
230 static int btree_writepage(struct page *page, struct writeback_control *wbc)
232 struct extent_map_tree *tree;
233 tree = &BTRFS_I(page->mapping->host)->extent_tree;
234 return extent_write_full_page(tree, page, btree_get_extent, wbc);
237 static int btree_writepages(struct address_space *mapping,
238 struct writeback_control *wbc)
240 struct extent_map_tree *tree;
241 tree = &BTRFS_I(mapping->host)->extent_tree;
242 if (wbc->sync_mode == WB_SYNC_NONE) {
245 unsigned long thresh = 96 * 1024 * 1024;
247 if (wbc->for_kupdate)
250 if (current_is_pdflush()) {
251 thresh = 96 * 1024 * 1024;
253 thresh = 8 * 1024 * 1024;
255 num_dirty = count_range_bits(tree, &start, (u64)-1,
256 thresh, EXTENT_DIRTY);
257 if (num_dirty < thresh) {
261 return extent_writepages(tree, mapping, btree_get_extent, wbc);
264 int btree_readpage(struct file *file, struct page *page)
266 struct extent_map_tree *tree;
267 tree = &BTRFS_I(page->mapping->host)->extent_tree;
268 return extent_read_full_page(tree, page, btree_get_extent);
271 static int btree_releasepage(struct page *page, gfp_t unused_gfp_flags)
273 struct extent_map_tree *tree;
276 tree = &BTRFS_I(page->mapping->host)->extent_tree;
277 ret = try_release_extent_mapping(tree, page);
279 ClearPagePrivate(page);
280 set_page_private(page, 0);
281 page_cache_release(page);
286 static void btree_invalidatepage(struct page *page, unsigned long offset)
288 struct extent_map_tree *tree;
289 tree = &BTRFS_I(page->mapping->host)->extent_tree;
290 extent_invalidatepage(tree, page, offset);
291 btree_releasepage(page, GFP_NOFS);
295 static int btree_writepage(struct page *page, struct writeback_control *wbc)
297 struct buffer_head *bh;
298 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
299 struct buffer_head *head;
300 if (!page_has_buffers(page)) {
301 create_empty_buffers(page, root->fs_info->sb->s_blocksize,
302 (1 << BH_Dirty)|(1 << BH_Uptodate));
304 head = page_buffers(page);
307 if (buffer_dirty(bh))
308 csum_tree_block(root, bh, 0);
309 bh = bh->b_this_page;
310 } while (bh != head);
311 return block_write_full_page(page, btree_get_block, wbc);
315 static struct address_space_operations btree_aops = {
316 .readpage = btree_readpage,
317 .writepage = btree_writepage,
318 .writepages = btree_writepages,
319 .releasepage = btree_releasepage,
320 .invalidatepage = btree_invalidatepage,
321 .sync_page = block_sync_page,
324 int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize)
326 struct extent_buffer *buf = NULL;
327 struct inode *btree_inode = root->fs_info->btree_inode;
330 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
333 read_extent_buffer_pages(&BTRFS_I(btree_inode)->extent_tree,
335 free_extent_buffer(buf);
339 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
342 struct extent_buffer *buf = NULL;
343 struct inode *btree_inode = root->fs_info->btree_inode;
344 struct extent_map_tree *extent_tree;
348 extent_tree = &BTRFS_I(btree_inode)->extent_tree;
350 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
353 read_extent_buffer_pages(&BTRFS_I(btree_inode)->extent_tree,
356 if (buf->flags & EXTENT_CSUM)
359 end = buf->start + PAGE_CACHE_SIZE - 1;
360 if (test_range_bit(extent_tree, buf->start, end, EXTENT_CSUM, 1)) {
361 buf->flags |= EXTENT_CSUM;
365 lock_extent(extent_tree, buf->start, end, GFP_NOFS);
367 if (test_range_bit(extent_tree, buf->start, end, EXTENT_CSUM, 1)) {
368 buf->flags |= EXTENT_CSUM;
372 ret = csum_tree_block(root, buf, 1);
373 set_extent_bits(extent_tree, buf->start, end, EXTENT_CSUM, GFP_NOFS);
374 buf->flags |= EXTENT_CSUM;
377 unlock_extent(extent_tree, buf->start, end, GFP_NOFS);
381 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
382 struct extent_buffer *buf)
384 struct inode *btree_inode = root->fs_info->btree_inode;
385 if (btrfs_header_generation(buf) ==
386 root->fs_info->running_transaction->transid)
387 clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree,
392 int wait_on_tree_block_writeback(struct btrfs_root *root,
393 struct extent_buffer *buf)
395 struct inode *btree_inode = root->fs_info->btree_inode;
396 wait_on_extent_buffer_writeback(&BTRFS_I(btree_inode)->extent_tree,
401 static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
402 u32 stripesize, struct btrfs_root *root,
403 struct btrfs_fs_info *fs_info,
408 root->commit_root = NULL;
409 root->sectorsize = sectorsize;
410 root->nodesize = nodesize;
411 root->leafsize = leafsize;
412 root->stripesize = stripesize;
414 root->fs_info = fs_info;
415 root->objectid = objectid;
416 root->last_trans = 0;
417 root->highest_inode = 0;
418 root->last_inode_alloc = 0;
421 memset(&root->root_key, 0, sizeof(root->root_key));
422 memset(&root->root_item, 0, sizeof(root->root_item));
423 memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
424 memset(&root->root_kobj, 0, sizeof(root->root_kobj));
425 init_completion(&root->kobj_unregister);
426 root->defrag_running = 0;
427 root->defrag_level = 0;
428 root->root_key.objectid = objectid;
432 static int find_and_setup_root(struct btrfs_root *tree_root,
433 struct btrfs_fs_info *fs_info,
435 struct btrfs_root *root)
440 __setup_root(tree_root->nodesize, tree_root->leafsize,
441 tree_root->sectorsize, tree_root->stripesize,
442 root, fs_info, objectid);
443 ret = btrfs_find_last_root(tree_root, objectid,
444 &root->root_item, &root->root_key);
447 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
448 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
454 struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_fs_info *fs_info,
455 struct btrfs_key *location)
457 struct btrfs_root *root;
458 struct btrfs_root *tree_root = fs_info->tree_root;
459 struct btrfs_path *path;
460 struct extent_buffer *l;
465 root = kzalloc(sizeof(*root), GFP_NOFS);
467 return ERR_PTR(-ENOMEM);
468 if (location->offset == (u64)-1) {
469 ret = find_and_setup_root(tree_root, fs_info,
470 location->objectid, root);
478 __setup_root(tree_root->nodesize, tree_root->leafsize,
479 tree_root->sectorsize, tree_root->stripesize,
480 root, fs_info, location->objectid);
482 path = btrfs_alloc_path();
484 ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
491 read_extent_buffer(l, &root->root_item,
492 btrfs_item_ptr_offset(l, path->slots[0]),
493 sizeof(root->root_item));
494 memcpy(&root->root_key, location, sizeof(*location));
497 btrfs_release_path(root, path);
498 btrfs_free_path(path);
503 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
504 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
509 ret = btrfs_find_highest_inode(root, &highest_inode);
511 root->highest_inode = highest_inode;
512 root->last_inode_alloc = highest_inode;
517 struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
520 struct btrfs_root *root;
522 if (root_objectid == BTRFS_ROOT_TREE_OBJECTID)
523 return fs_info->tree_root;
524 if (root_objectid == BTRFS_EXTENT_TREE_OBJECTID)
525 return fs_info->extent_root;
527 root = radix_tree_lookup(&fs_info->fs_roots_radix,
528 (unsigned long)root_objectid);
532 struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
533 struct btrfs_key *location)
535 struct btrfs_root *root;
538 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
539 return fs_info->tree_root;
540 if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
541 return fs_info->extent_root;
543 root = radix_tree_lookup(&fs_info->fs_roots_radix,
544 (unsigned long)location->objectid);
548 root = btrfs_read_fs_root_no_radix(fs_info, location);
551 ret = radix_tree_insert(&fs_info->fs_roots_radix,
552 (unsigned long)root->root_key.objectid,
555 free_extent_buffer(root->node);
559 ret = btrfs_find_dead_roots(fs_info->tree_root,
560 root->root_key.objectid, root);
566 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
567 struct btrfs_key *location,
568 const char *name, int namelen)
570 struct btrfs_root *root;
573 root = btrfs_read_fs_root_no_name(fs_info, location);
580 ret = btrfs_set_root_name(root, name, namelen);
582 free_extent_buffer(root->node);
587 ret = btrfs_sysfs_add_root(root);
589 free_extent_buffer(root->node);
598 static int add_hasher(struct btrfs_fs_info *info, char *type) {
599 struct btrfs_hasher *hasher;
601 hasher = kmalloc(sizeof(*hasher), GFP_NOFS);
604 hasher->hash_tfm = crypto_alloc_hash(type, 0, CRYPTO_ALG_ASYNC);
605 if (!hasher->hash_tfm) {
609 spin_lock(&info->hash_lock);
610 list_add(&hasher->list, &info->hashers);
611 spin_unlock(&info->hash_lock);
615 struct btrfs_root *open_ctree(struct super_block *sb)
622 struct btrfs_root *extent_root = kmalloc(sizeof(struct btrfs_root),
624 struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root),
626 struct btrfs_fs_info *fs_info = kmalloc(sizeof(*fs_info),
630 struct btrfs_super_block *disk_super;
632 if (!extent_root || !tree_root || !fs_info) {
636 INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_NOFS);
637 INIT_LIST_HEAD(&fs_info->trans_list);
638 INIT_LIST_HEAD(&fs_info->dead_roots);
639 INIT_LIST_HEAD(&fs_info->hashers);
640 spin_lock_init(&fs_info->hash_lock);
641 spin_lock_init(&fs_info->delalloc_lock);
643 memset(&fs_info->super_kobj, 0, sizeof(fs_info->super_kobj));
644 init_completion(&fs_info->kobj_unregister);
645 sb_set_blocksize(sb, 4096);
646 fs_info->running_transaction = NULL;
647 fs_info->last_trans_committed = 0;
648 fs_info->tree_root = tree_root;
649 fs_info->extent_root = extent_root;
651 fs_info->throttles = 0;
652 fs_info->mount_opt = 0;
653 fs_info->max_extent = (u64)-1;
654 fs_info->delalloc_bytes = 0;
655 fs_info->btree_inode = new_inode(sb);
656 fs_info->btree_inode->i_ino = 1;
657 fs_info->btree_inode->i_nlink = 1;
658 fs_info->btree_inode->i_size = sb->s_bdev->bd_inode->i_size;
659 fs_info->btree_inode->i_mapping->a_ops = &btree_aops;
660 extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree,
661 fs_info->btree_inode->i_mapping,
663 BTRFS_I(fs_info->btree_inode)->extent_tree.ops = &btree_extent_map_ops;
665 extent_map_tree_init(&fs_info->free_space_cache,
666 fs_info->btree_inode->i_mapping, GFP_NOFS);
667 extent_map_tree_init(&fs_info->block_group_cache,
668 fs_info->btree_inode->i_mapping, GFP_NOFS);
669 extent_map_tree_init(&fs_info->pinned_extents,
670 fs_info->btree_inode->i_mapping, GFP_NOFS);
671 extent_map_tree_init(&fs_info->pending_del,
672 fs_info->btree_inode->i_mapping, GFP_NOFS);
673 extent_map_tree_init(&fs_info->extent_ins,
674 fs_info->btree_inode->i_mapping, GFP_NOFS);
675 fs_info->do_barriers = 1;
676 fs_info->closing = 0;
677 fs_info->total_pinned = 0;
678 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
679 INIT_WORK(&fs_info->trans_work, btrfs_transaction_cleaner, fs_info);
681 INIT_DELAYED_WORK(&fs_info->trans_work, btrfs_transaction_cleaner);
683 BTRFS_I(fs_info->btree_inode)->root = tree_root;
684 memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
685 sizeof(struct btrfs_key));
686 insert_inode_hash(fs_info->btree_inode);
687 mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
689 mutex_init(&fs_info->trans_mutex);
690 mutex_init(&fs_info->fs_mutex);
693 ret = add_hasher(fs_info, "crc32c");
695 printk("btrfs: failed hash setup, modprobe cryptomgr?\n");
700 __setup_root(512, 512, 512, 512, tree_root,
701 fs_info, BTRFS_ROOT_TREE_OBJECTID);
703 fs_info->sb_buffer = read_tree_block(tree_root,
704 BTRFS_SUPER_INFO_OFFSET,
707 if (!fs_info->sb_buffer)
710 read_extent_buffer(fs_info->sb_buffer, &fs_info->super_copy, 0,
711 sizeof(fs_info->super_copy));
713 read_extent_buffer(fs_info->sb_buffer, fs_info->fsid,
714 (unsigned long)btrfs_super_fsid(fs_info->sb_buffer),
716 disk_super = &fs_info->super_copy;
717 if (!btrfs_super_root(disk_super))
720 nodesize = btrfs_super_nodesize(disk_super);
721 leafsize = btrfs_super_leafsize(disk_super);
722 sectorsize = btrfs_super_sectorsize(disk_super);
723 stripesize = btrfs_super_stripesize(disk_super);
724 tree_root->nodesize = nodesize;
725 tree_root->leafsize = leafsize;
726 tree_root->sectorsize = sectorsize;
727 tree_root->stripesize = stripesize;
728 sb_set_blocksize(sb, sectorsize);
730 i_size_write(fs_info->btree_inode,
731 btrfs_super_total_bytes(disk_super));
733 if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
734 sizeof(disk_super->magic))) {
735 printk("btrfs: valid FS not found on %s\n", sb->s_id);
739 blocksize = btrfs_level_size(tree_root,
740 btrfs_super_root_level(disk_super));
742 tree_root->node = read_tree_block(tree_root,
743 btrfs_super_root(disk_super),
745 if (!tree_root->node)
748 mutex_lock(&fs_info->fs_mutex);
750 ret = find_and_setup_root(tree_root, fs_info,
751 BTRFS_EXTENT_TREE_OBJECTID, extent_root);
753 mutex_unlock(&fs_info->fs_mutex);
757 btrfs_read_block_groups(extent_root);
759 fs_info->generation = btrfs_super_generation(disk_super) + 1;
760 mutex_unlock(&fs_info->fs_mutex);
764 free_extent_buffer(tree_root->node);
766 free_extent_buffer(fs_info->sb_buffer);
768 iput(fs_info->btree_inode);
776 int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
780 struct extent_buffer *super = root->fs_info->sb_buffer;
781 struct inode *btree_inode = root->fs_info->btree_inode;
782 struct super_block *sb = root->fs_info->sb;
784 if (!btrfs_test_opt(root, NOBARRIER))
785 blkdev_issue_flush(sb->s_bdev, NULL);
786 set_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, super);
787 ret = sync_page_range_nolock(btree_inode, btree_inode->i_mapping,
788 super->start, super->len);
789 if (!btrfs_test_opt(root, NOBARRIER))
790 blkdev_issue_flush(sb->s_bdev, NULL);
794 int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
796 radix_tree_delete(&fs_info->fs_roots_radix,
797 (unsigned long)root->root_key.objectid);
799 btrfs_sysfs_del_root(root);
803 free_extent_buffer(root->node);
804 if (root->commit_root)
805 free_extent_buffer(root->commit_root);
812 static int del_fs_roots(struct btrfs_fs_info *fs_info)
815 struct btrfs_root *gang[8];
819 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
824 for (i = 0; i < ret; i++)
825 btrfs_free_fs_root(fs_info, gang[i]);
830 int close_ctree(struct btrfs_root *root)
833 struct btrfs_trans_handle *trans;
834 struct btrfs_fs_info *fs_info = root->fs_info;
836 fs_info->closing = 1;
837 btrfs_transaction_flush_work(root);
838 mutex_lock(&fs_info->fs_mutex);
839 btrfs_defrag_dirty_roots(root->fs_info);
840 trans = btrfs_start_transaction(root, 1);
841 ret = btrfs_commit_transaction(trans, root);
842 /* run commit again to drop the original snapshot */
843 trans = btrfs_start_transaction(root, 1);
844 btrfs_commit_transaction(trans, root);
845 ret = btrfs_write_and_wait_transaction(NULL, root);
847 write_ctree_super(NULL, root);
848 mutex_unlock(&fs_info->fs_mutex);
850 if (fs_info->extent_root->node)
851 free_extent_buffer(fs_info->extent_root->node);
853 if (fs_info->tree_root->node)
854 free_extent_buffer(fs_info->tree_root->node);
856 free_extent_buffer(fs_info->sb_buffer);
858 btrfs_free_block_groups(root->fs_info);
859 del_fs_roots(fs_info);
861 filemap_write_and_wait(fs_info->btree_inode->i_mapping);
863 extent_map_tree_empty_lru(&fs_info->free_space_cache);
864 extent_map_tree_empty_lru(&fs_info->block_group_cache);
865 extent_map_tree_empty_lru(&fs_info->pinned_extents);
866 extent_map_tree_empty_lru(&fs_info->pending_del);
867 extent_map_tree_empty_lru(&fs_info->extent_ins);
868 extent_map_tree_empty_lru(&BTRFS_I(fs_info->btree_inode)->extent_tree);
870 truncate_inode_pages(fs_info->btree_inode->i_mapping, 0);
872 iput(fs_info->btree_inode);
874 while(!list_empty(&fs_info->hashers)) {
875 struct btrfs_hasher *hasher;
876 hasher = list_entry(fs_info->hashers.next, struct btrfs_hasher,
878 list_del(&hasher->hashers);
879 crypto_free_hash(&fs_info->hash_tfm);
883 kfree(fs_info->extent_root);
884 kfree(fs_info->tree_root);
888 int btrfs_buffer_uptodate(struct extent_buffer *buf)
890 struct inode *btree_inode = buf->first_page->mapping->host;
891 return extent_buffer_uptodate(&BTRFS_I(btree_inode)->extent_tree, buf);
894 int btrfs_set_buffer_uptodate(struct extent_buffer *buf)
896 struct inode *btree_inode = buf->first_page->mapping->host;
897 return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->extent_tree,
901 void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
903 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
904 u64 transid = btrfs_header_generation(buf);
905 struct inode *btree_inode = root->fs_info->btree_inode;
907 if (transid != root->fs_info->generation) {
908 printk(KERN_CRIT "transid mismatch buffer %llu, found %Lu running %Lu\n",
909 (unsigned long long)buf->start,
910 transid, root->fs_info->generation);
913 set_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, buf);
916 void btrfs_throttle(struct btrfs_root *root)
918 struct backing_dev_info *bdi;
920 bdi = root->fs_info->sb->s_bdev->bd_inode->i_mapping->backing_dev_info;
921 if (root->fs_info->throttles && bdi_write_congested(bdi))
922 congestion_wait(WRITE, HZ/20);
925 void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
927 balance_dirty_pages_ratelimited_nr(
928 root->fs_info->btree_inode->i_mapping, 1);
931 void btrfs_set_buffer_defrag(struct extent_buffer *buf)
933 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
934 struct inode *btree_inode = root->fs_info->btree_inode;
935 set_extent_bits(&BTRFS_I(btree_inode)->extent_tree, buf->start,
936 buf->start + buf->len - 1, EXTENT_DEFRAG, GFP_NOFS);
939 void btrfs_set_buffer_defrag_done(struct extent_buffer *buf)
941 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
942 struct inode *btree_inode = root->fs_info->btree_inode;
943 set_extent_bits(&BTRFS_I(btree_inode)->extent_tree, buf->start,
944 buf->start + buf->len - 1, EXTENT_DEFRAG_DONE,
948 int btrfs_buffer_defrag(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 return test_range_bit(&BTRFS_I(btree_inode)->extent_tree,
953 buf->start, buf->start + buf->len - 1, EXTENT_DEFRAG, 0);
956 int btrfs_buffer_defrag_done(struct extent_buffer *buf)
958 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
959 struct inode *btree_inode = root->fs_info->btree_inode;
960 return test_range_bit(&BTRFS_I(btree_inode)->extent_tree,
961 buf->start, buf->start + buf->len - 1,
962 EXTENT_DEFRAG_DONE, 0);
965 int btrfs_clear_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 clear_extent_bits(&BTRFS_I(btree_inode)->extent_tree,
970 buf->start, buf->start + buf->len - 1,
971 EXTENT_DEFRAG_DONE, GFP_NOFS);
974 int btrfs_clear_buffer_defrag(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, GFP_NOFS);
983 int btrfs_read_buffer(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 read_extent_buffer_pages(&BTRFS_I(btree_inode)->extent_tree,
991 static struct extent_map_ops btree_extent_map_ops = {
992 .writepage_io_hook = btree_writepage_io_hook,