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_io_ops btree_extent_io_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)->io_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)->io_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 len,
73 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
74 struct extent_map *em;
78 spin_lock(&em_tree->lock);
79 em = lookup_extent_mapping(em_tree, start, len);
80 spin_unlock(&em_tree->lock);
84 em = alloc_extent_map(GFP_NOFS);
86 em = ERR_PTR(-ENOMEM);
90 em->len = i_size_read(inode);
92 em->bdev = inode->i_sb->s_bdev;
94 spin_lock(&em_tree->lock);
95 ret = add_extent_mapping(em_tree, em);
96 spin_unlock(&em_tree->lock);
109 u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len)
111 return crc32c(seed, data, len);
114 void btrfs_csum_final(u32 crc, char *result)
116 *(__le32 *)result = ~cpu_to_le32(crc);
119 static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
122 char result[BTRFS_CRC32_SIZE];
124 unsigned long cur_len;
125 unsigned long offset = BTRFS_CSUM_SIZE;
126 char *map_token = NULL;
128 unsigned long map_start;
129 unsigned long map_len;
133 len = buf->len - offset;
135 err = map_private_extent_buffer(buf, offset, 32,
137 &map_start, &map_len, KM_USER0);
139 printk("failed to map extent buffer! %lu\n",
143 cur_len = min(len, map_len - (offset - map_start));
144 crc = btrfs_csum_data(root, kaddr + offset - map_start,
148 unmap_extent_buffer(buf, map_token, KM_USER0);
150 btrfs_csum_final(crc, result);
153 int from_this_trans = 0;
155 if (root->fs_info->running_transaction &&
156 btrfs_header_generation(buf) ==
157 root->fs_info->running_transaction->transid)
160 /* FIXME, this is not good */
161 if (from_this_trans == 0 &&
162 memcmp_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE)) {
165 memcpy(&found, result, BTRFS_CRC32_SIZE);
167 read_extent_buffer(buf, &val, 0, BTRFS_CRC32_SIZE);
168 printk("btrfs: %s checksum verify failed on %llu "
169 "wanted %X found %X from_this_trans %d\n",
170 root->fs_info->sb->s_id,
171 buf->start, val, found, from_this_trans);
175 write_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE);
181 int csum_dirty_buffer(struct btrfs_root *root, struct page *page)
183 struct extent_io_tree *tree;
184 u64 start = (u64)page->index << PAGE_CACHE_SHIFT;
188 struct extent_buffer *eb;
189 tree = &BTRFS_I(page->mapping->host)->io_tree;
191 if (page->private == EXTENT_PAGE_PRIVATE)
195 len = page->private >> 2;
199 eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS);
200 read_extent_buffer_pages(tree, eb, start + PAGE_CACHE_SIZE, 1);
201 btrfs_clear_buffer_defrag(eb);
202 found_start = btrfs_header_bytenr(eb);
203 if (found_start != start) {
204 printk("warning: eb start incorrect %Lu buffer %Lu len %lu\n",
205 start, found_start, len);
209 if (eb->first_page != page) {
210 printk("bad first page %lu %lu\n", eb->first_page->index,
215 if (!PageUptodate(page)) {
216 printk("csum not up to date page %lu\n", page->index);
220 found_level = btrfs_header_level(eb);
221 csum_tree_block(root, eb, 0);
223 free_extent_buffer(eb);
228 static int btree_writepage_io_hook(struct page *page, u64 start, u64 end)
230 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
232 csum_dirty_buffer(root, page);
236 static int btree_writepage(struct page *page, struct writeback_control *wbc)
238 struct extent_io_tree *tree;
239 tree = &BTRFS_I(page->mapping->host)->io_tree;
240 return extent_write_full_page(tree, page, btree_get_extent, wbc);
243 static int btree_writepages(struct address_space *mapping,
244 struct writeback_control *wbc)
246 struct extent_io_tree *tree;
247 tree = &BTRFS_I(mapping->host)->io_tree;
248 if (wbc->sync_mode == WB_SYNC_NONE) {
251 unsigned long thresh = 96 * 1024 * 1024;
253 if (wbc->for_kupdate)
256 if (current_is_pdflush()) {
257 thresh = 96 * 1024 * 1024;
259 thresh = 8 * 1024 * 1024;
261 num_dirty = count_range_bits(tree, &start, (u64)-1,
262 thresh, EXTENT_DIRTY);
263 if (num_dirty < thresh) {
267 return extent_writepages(tree, mapping, btree_get_extent, wbc);
270 int btree_readpage(struct file *file, struct page *page)
272 struct extent_io_tree *tree;
273 tree = &BTRFS_I(page->mapping->host)->io_tree;
274 return extent_read_full_page(tree, page, btree_get_extent);
277 static int btree_releasepage(struct page *page, gfp_t gfp_flags)
279 struct extent_io_tree *tree;
280 struct extent_map_tree *map;
283 tree = &BTRFS_I(page->mapping->host)->io_tree;
284 map = &BTRFS_I(page->mapping->host)->extent_tree;
285 ret = try_release_extent_mapping(map, tree, page, gfp_flags);
287 ClearPagePrivate(page);
288 set_page_private(page, 0);
289 page_cache_release(page);
294 static void btree_invalidatepage(struct page *page, unsigned long offset)
296 struct extent_io_tree *tree;
297 tree = &BTRFS_I(page->mapping->host)->io_tree;
298 extent_invalidatepage(tree, page, offset);
299 btree_releasepage(page, GFP_NOFS);
303 static int btree_writepage(struct page *page, struct writeback_control *wbc)
305 struct buffer_head *bh;
306 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
307 struct buffer_head *head;
308 if (!page_has_buffers(page)) {
309 create_empty_buffers(page, root->fs_info->sb->s_blocksize,
310 (1 << BH_Dirty)|(1 << BH_Uptodate));
312 head = page_buffers(page);
315 if (buffer_dirty(bh))
316 csum_tree_block(root, bh, 0);
317 bh = bh->b_this_page;
318 } while (bh != head);
319 return block_write_full_page(page, btree_get_block, wbc);
323 static struct address_space_operations btree_aops = {
324 .readpage = btree_readpage,
325 .writepage = btree_writepage,
326 .writepages = btree_writepages,
327 .releasepage = btree_releasepage,
328 .invalidatepage = btree_invalidatepage,
329 .sync_page = block_sync_page,
332 int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize)
334 struct extent_buffer *buf = NULL;
335 struct inode *btree_inode = root->fs_info->btree_inode;
338 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
341 read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree,
343 free_extent_buffer(buf);
347 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
350 struct extent_buffer *buf = NULL;
351 struct inode *btree_inode = root->fs_info->btree_inode;
352 struct extent_io_tree *io_tree;
356 io_tree = &BTRFS_I(btree_inode)->io_tree;
358 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
361 read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree, buf, 0, 1);
363 if (buf->flags & EXTENT_CSUM)
366 end = buf->start + PAGE_CACHE_SIZE - 1;
367 if (test_range_bit(io_tree, buf->start, end, EXTENT_CSUM, 1)) {
368 buf->flags |= EXTENT_CSUM;
372 lock_extent(io_tree, buf->start, end, GFP_NOFS);
374 if (test_range_bit(io_tree, buf->start, end, EXTENT_CSUM, 1)) {
375 buf->flags |= EXTENT_CSUM;
379 ret = csum_tree_block(root, buf, 1);
380 set_extent_bits(io_tree, buf->start, end, EXTENT_CSUM, GFP_NOFS);
381 buf->flags |= EXTENT_CSUM;
384 unlock_extent(io_tree, buf->start, end, GFP_NOFS);
388 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
389 struct extent_buffer *buf)
391 struct inode *btree_inode = root->fs_info->btree_inode;
392 if (btrfs_header_generation(buf) ==
393 root->fs_info->running_transaction->transid)
394 clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree,
399 int wait_on_tree_block_writeback(struct btrfs_root *root,
400 struct extent_buffer *buf)
402 struct inode *btree_inode = root->fs_info->btree_inode;
403 wait_on_extent_buffer_writeback(&BTRFS_I(btree_inode)->io_tree,
408 static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
409 u32 stripesize, struct btrfs_root *root,
410 struct btrfs_fs_info *fs_info,
415 root->commit_root = NULL;
416 root->sectorsize = sectorsize;
417 root->nodesize = nodesize;
418 root->leafsize = leafsize;
419 root->stripesize = stripesize;
421 root->fs_info = fs_info;
422 root->objectid = objectid;
423 root->last_trans = 0;
424 root->highest_inode = 0;
425 root->last_inode_alloc = 0;
428 memset(&root->root_key, 0, sizeof(root->root_key));
429 memset(&root->root_item, 0, sizeof(root->root_item));
430 memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
431 memset(&root->root_kobj, 0, sizeof(root->root_kobj));
432 init_completion(&root->kobj_unregister);
433 root->defrag_running = 0;
434 root->defrag_level = 0;
435 root->root_key.objectid = objectid;
439 static int find_and_setup_root(struct btrfs_root *tree_root,
440 struct btrfs_fs_info *fs_info,
442 struct btrfs_root *root)
447 __setup_root(tree_root->nodesize, tree_root->leafsize,
448 tree_root->sectorsize, tree_root->stripesize,
449 root, fs_info, objectid);
450 ret = btrfs_find_last_root(tree_root, objectid,
451 &root->root_item, &root->root_key);
454 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
455 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
461 struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_fs_info *fs_info,
462 struct btrfs_key *location)
464 struct btrfs_root *root;
465 struct btrfs_root *tree_root = fs_info->tree_root;
466 struct btrfs_path *path;
467 struct extent_buffer *l;
472 root = kzalloc(sizeof(*root), GFP_NOFS);
474 return ERR_PTR(-ENOMEM);
475 if (location->offset == (u64)-1) {
476 ret = find_and_setup_root(tree_root, fs_info,
477 location->objectid, root);
485 __setup_root(tree_root->nodesize, tree_root->leafsize,
486 tree_root->sectorsize, tree_root->stripesize,
487 root, fs_info, location->objectid);
489 path = btrfs_alloc_path();
491 ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
498 read_extent_buffer(l, &root->root_item,
499 btrfs_item_ptr_offset(l, path->slots[0]),
500 sizeof(root->root_item));
501 memcpy(&root->root_key, location, sizeof(*location));
504 btrfs_release_path(root, path);
505 btrfs_free_path(path);
510 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
511 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
516 ret = btrfs_find_highest_inode(root, &highest_inode);
518 root->highest_inode = highest_inode;
519 root->last_inode_alloc = highest_inode;
524 struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
527 struct btrfs_root *root;
529 if (root_objectid == BTRFS_ROOT_TREE_OBJECTID)
530 return fs_info->tree_root;
531 if (root_objectid == BTRFS_EXTENT_TREE_OBJECTID)
532 return fs_info->extent_root;
534 root = radix_tree_lookup(&fs_info->fs_roots_radix,
535 (unsigned long)root_objectid);
539 struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
540 struct btrfs_key *location)
542 struct btrfs_root *root;
545 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
546 return fs_info->tree_root;
547 if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
548 return fs_info->extent_root;
550 root = radix_tree_lookup(&fs_info->fs_roots_radix,
551 (unsigned long)location->objectid);
555 root = btrfs_read_fs_root_no_radix(fs_info, location);
558 ret = radix_tree_insert(&fs_info->fs_roots_radix,
559 (unsigned long)root->root_key.objectid,
562 free_extent_buffer(root->node);
566 ret = btrfs_find_dead_roots(fs_info->tree_root,
567 root->root_key.objectid, root);
573 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
574 struct btrfs_key *location,
575 const char *name, int namelen)
577 struct btrfs_root *root;
580 root = btrfs_read_fs_root_no_name(fs_info, location);
587 ret = btrfs_set_root_name(root, name, namelen);
589 free_extent_buffer(root->node);
594 ret = btrfs_sysfs_add_root(root);
596 free_extent_buffer(root->node);
605 static int add_hasher(struct btrfs_fs_info *info, char *type) {
606 struct btrfs_hasher *hasher;
608 hasher = kmalloc(sizeof(*hasher), GFP_NOFS);
611 hasher->hash_tfm = crypto_alloc_hash(type, 0, CRYPTO_ALG_ASYNC);
612 if (!hasher->hash_tfm) {
616 spin_lock(&info->hash_lock);
617 list_add(&hasher->list, &info->hashers);
618 spin_unlock(&info->hash_lock);
622 struct btrfs_root *open_ctree(struct super_block *sb)
629 struct btrfs_root *extent_root = kmalloc(sizeof(struct btrfs_root),
631 struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root),
633 struct btrfs_fs_info *fs_info = kmalloc(sizeof(*fs_info),
637 struct btrfs_super_block *disk_super;
639 if (!extent_root || !tree_root || !fs_info) {
643 INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_NOFS);
644 INIT_LIST_HEAD(&fs_info->trans_list);
645 INIT_LIST_HEAD(&fs_info->dead_roots);
646 INIT_LIST_HEAD(&fs_info->hashers);
647 spin_lock_init(&fs_info->hash_lock);
648 spin_lock_init(&fs_info->delalloc_lock);
649 spin_lock_init(&fs_info->new_trans_lock);
651 memset(&fs_info->super_kobj, 0, sizeof(fs_info->super_kobj));
652 init_completion(&fs_info->kobj_unregister);
653 sb_set_blocksize(sb, 4096);
654 fs_info->running_transaction = NULL;
655 fs_info->last_trans_committed = 0;
656 fs_info->tree_root = tree_root;
657 fs_info->extent_root = extent_root;
659 fs_info->throttles = 0;
660 fs_info->mount_opt = 0;
661 fs_info->max_extent = (u64)-1;
662 fs_info->max_inline = 8192 * 1024;
663 fs_info->delalloc_bytes = 0;
664 fs_info->btree_inode = new_inode(sb);
665 fs_info->btree_inode->i_ino = 1;
666 fs_info->btree_inode->i_nlink = 1;
667 fs_info->btree_inode->i_size = sb->s_bdev->bd_inode->i_size;
668 fs_info->btree_inode->i_mapping->a_ops = &btree_aops;
669 extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree,
670 fs_info->btree_inode->i_mapping,
672 extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree,
675 BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops;
677 extent_io_tree_init(&fs_info->free_space_cache,
678 fs_info->btree_inode->i_mapping, GFP_NOFS);
679 extent_io_tree_init(&fs_info->block_group_cache,
680 fs_info->btree_inode->i_mapping, GFP_NOFS);
681 extent_io_tree_init(&fs_info->pinned_extents,
682 fs_info->btree_inode->i_mapping, GFP_NOFS);
683 extent_io_tree_init(&fs_info->pending_del,
684 fs_info->btree_inode->i_mapping, GFP_NOFS);
685 extent_io_tree_init(&fs_info->extent_ins,
686 fs_info->btree_inode->i_mapping, GFP_NOFS);
687 fs_info->do_barriers = 1;
688 fs_info->closing = 0;
689 fs_info->total_pinned = 0;
690 fs_info->last_alloc = 0;
692 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
693 INIT_WORK(&fs_info->trans_work, btrfs_transaction_cleaner, fs_info);
695 INIT_DELAYED_WORK(&fs_info->trans_work, btrfs_transaction_cleaner);
697 BTRFS_I(fs_info->btree_inode)->root = tree_root;
698 memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
699 sizeof(struct btrfs_key));
700 insert_inode_hash(fs_info->btree_inode);
701 mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
703 mutex_init(&fs_info->trans_mutex);
704 mutex_init(&fs_info->fs_mutex);
707 ret = add_hasher(fs_info, "crc32c");
709 printk("btrfs: failed hash setup, modprobe cryptomgr?\n");
714 __setup_root(512, 512, 512, 512, tree_root,
715 fs_info, BTRFS_ROOT_TREE_OBJECTID);
717 fs_info->sb_buffer = read_tree_block(tree_root,
718 BTRFS_SUPER_INFO_OFFSET,
721 if (!fs_info->sb_buffer)
724 read_extent_buffer(fs_info->sb_buffer, &fs_info->super_copy, 0,
725 sizeof(fs_info->super_copy));
727 read_extent_buffer(fs_info->sb_buffer, fs_info->fsid,
728 (unsigned long)btrfs_super_fsid(fs_info->sb_buffer),
730 disk_super = &fs_info->super_copy;
731 if (!btrfs_super_root(disk_super))
734 nodesize = btrfs_super_nodesize(disk_super);
735 leafsize = btrfs_super_leafsize(disk_super);
736 sectorsize = btrfs_super_sectorsize(disk_super);
737 stripesize = btrfs_super_stripesize(disk_super);
738 tree_root->nodesize = nodesize;
739 tree_root->leafsize = leafsize;
740 tree_root->sectorsize = sectorsize;
741 tree_root->stripesize = stripesize;
742 sb_set_blocksize(sb, sectorsize);
744 i_size_write(fs_info->btree_inode,
745 btrfs_super_total_bytes(disk_super));
747 if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
748 sizeof(disk_super->magic))) {
749 printk("btrfs: valid FS not found on %s\n", sb->s_id);
753 blocksize = btrfs_level_size(tree_root,
754 btrfs_super_root_level(disk_super));
756 tree_root->node = read_tree_block(tree_root,
757 btrfs_super_root(disk_super),
759 if (!tree_root->node)
762 mutex_lock(&fs_info->fs_mutex);
764 ret = find_and_setup_root(tree_root, fs_info,
765 BTRFS_EXTENT_TREE_OBJECTID, extent_root);
767 mutex_unlock(&fs_info->fs_mutex);
771 btrfs_read_block_groups(extent_root);
773 fs_info->generation = btrfs_super_generation(disk_super) + 1;
774 mutex_unlock(&fs_info->fs_mutex);
778 free_extent_buffer(tree_root->node);
780 free_extent_buffer(fs_info->sb_buffer);
782 iput(fs_info->btree_inode);
790 int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
794 struct extent_buffer *super = root->fs_info->sb_buffer;
795 struct inode *btree_inode = root->fs_info->btree_inode;
796 struct super_block *sb = root->fs_info->sb;
798 if (!btrfs_test_opt(root, NOBARRIER))
799 blkdev_issue_flush(sb->s_bdev, NULL);
800 set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, super);
801 ret = sync_page_range_nolock(btree_inode, btree_inode->i_mapping,
802 super->start, super->len);
803 if (!btrfs_test_opt(root, NOBARRIER))
804 blkdev_issue_flush(sb->s_bdev, NULL);
808 int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
810 radix_tree_delete(&fs_info->fs_roots_radix,
811 (unsigned long)root->root_key.objectid);
813 btrfs_sysfs_del_root(root);
817 free_extent_buffer(root->node);
818 if (root->commit_root)
819 free_extent_buffer(root->commit_root);
826 static int del_fs_roots(struct btrfs_fs_info *fs_info)
829 struct btrfs_root *gang[8];
833 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
838 for (i = 0; i < ret; i++)
839 btrfs_free_fs_root(fs_info, gang[i]);
844 int close_ctree(struct btrfs_root *root)
847 struct btrfs_trans_handle *trans;
848 struct btrfs_fs_info *fs_info = root->fs_info;
850 fs_info->closing = 1;
851 btrfs_transaction_flush_work(root);
852 mutex_lock(&fs_info->fs_mutex);
853 btrfs_defrag_dirty_roots(root->fs_info);
854 trans = btrfs_start_transaction(root, 1);
855 ret = btrfs_commit_transaction(trans, root);
856 /* run commit again to drop the original snapshot */
857 trans = btrfs_start_transaction(root, 1);
858 btrfs_commit_transaction(trans, root);
859 ret = btrfs_write_and_wait_transaction(NULL, root);
861 write_ctree_super(NULL, root);
862 mutex_unlock(&fs_info->fs_mutex);
864 if (fs_info->delalloc_bytes) {
865 printk("btrfs: at unmount delalloc count %Lu\n",
866 fs_info->delalloc_bytes);
868 if (fs_info->extent_root->node)
869 free_extent_buffer(fs_info->extent_root->node);
871 if (fs_info->tree_root->node)
872 free_extent_buffer(fs_info->tree_root->node);
874 free_extent_buffer(fs_info->sb_buffer);
876 btrfs_free_block_groups(root->fs_info);
877 del_fs_roots(fs_info);
879 filemap_write_and_wait(fs_info->btree_inode->i_mapping);
881 extent_io_tree_empty_lru(&fs_info->free_space_cache);
882 extent_io_tree_empty_lru(&fs_info->block_group_cache);
883 extent_io_tree_empty_lru(&fs_info->pinned_extents);
884 extent_io_tree_empty_lru(&fs_info->pending_del);
885 extent_io_tree_empty_lru(&fs_info->extent_ins);
886 extent_io_tree_empty_lru(&BTRFS_I(fs_info->btree_inode)->io_tree);
888 truncate_inode_pages(fs_info->btree_inode->i_mapping, 0);
890 iput(fs_info->btree_inode);
892 while(!list_empty(&fs_info->hashers)) {
893 struct btrfs_hasher *hasher;
894 hasher = list_entry(fs_info->hashers.next, struct btrfs_hasher,
896 list_del(&hasher->hashers);
897 crypto_free_hash(&fs_info->hash_tfm);
901 kfree(fs_info->extent_root);
902 kfree(fs_info->tree_root);
906 int btrfs_buffer_uptodate(struct extent_buffer *buf)
908 struct inode *btree_inode = buf->first_page->mapping->host;
909 return extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, buf);
912 int btrfs_set_buffer_uptodate(struct extent_buffer *buf)
914 struct inode *btree_inode = buf->first_page->mapping->host;
915 return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree,
919 void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
921 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
922 u64 transid = btrfs_header_generation(buf);
923 struct inode *btree_inode = root->fs_info->btree_inode;
925 if (transid != root->fs_info->generation) {
926 printk(KERN_CRIT "transid mismatch buffer %llu, found %Lu running %Lu\n",
927 (unsigned long long)buf->start,
928 transid, root->fs_info->generation);
931 set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, buf);
934 void btrfs_throttle(struct btrfs_root *root)
936 struct backing_dev_info *bdi;
938 bdi = root->fs_info->sb->s_bdev->bd_inode->i_mapping->backing_dev_info;
939 if (root->fs_info->throttles && bdi_write_congested(bdi)) {
940 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18)
941 congestion_wait(WRITE, HZ/20);
943 blk_congestion_wait(WRITE, HZ/20);
948 void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
950 balance_dirty_pages_ratelimited_nr(
951 root->fs_info->btree_inode->i_mapping, 1);
954 void btrfs_set_buffer_defrag(struct extent_buffer *buf)
956 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
957 struct inode *btree_inode = root->fs_info->btree_inode;
958 set_extent_bits(&BTRFS_I(btree_inode)->io_tree, buf->start,
959 buf->start + buf->len - 1, EXTENT_DEFRAG, GFP_NOFS);
962 void btrfs_set_buffer_defrag_done(struct extent_buffer *buf)
964 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
965 struct inode *btree_inode = root->fs_info->btree_inode;
966 set_extent_bits(&BTRFS_I(btree_inode)->io_tree, buf->start,
967 buf->start + buf->len - 1, EXTENT_DEFRAG_DONE,
971 int btrfs_buffer_defrag(struct extent_buffer *buf)
973 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
974 struct inode *btree_inode = root->fs_info->btree_inode;
975 return test_range_bit(&BTRFS_I(btree_inode)->io_tree,
976 buf->start, buf->start + buf->len - 1, EXTENT_DEFRAG, 0);
979 int btrfs_buffer_defrag_done(struct extent_buffer *buf)
981 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
982 struct inode *btree_inode = root->fs_info->btree_inode;
983 return test_range_bit(&BTRFS_I(btree_inode)->io_tree,
984 buf->start, buf->start + buf->len - 1,
985 EXTENT_DEFRAG_DONE, 0);
988 int btrfs_clear_buffer_defrag_done(struct extent_buffer *buf)
990 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
991 struct inode *btree_inode = root->fs_info->btree_inode;
992 return clear_extent_bits(&BTRFS_I(btree_inode)->io_tree,
993 buf->start, buf->start + buf->len - 1,
994 EXTENT_DEFRAG_DONE, GFP_NOFS);
997 int btrfs_clear_buffer_defrag(struct extent_buffer *buf)
999 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1000 struct inode *btree_inode = root->fs_info->btree_inode;
1001 return clear_extent_bits(&BTRFS_I(btree_inode)->io_tree,
1002 buf->start, buf->start + buf->len - 1,
1003 EXTENT_DEFRAG, GFP_NOFS);
1006 int btrfs_read_buffer(struct extent_buffer *buf)
1008 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1009 struct inode *btree_inode = root->fs_info->btree_inode;
1010 return read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree,
1014 static struct extent_io_ops btree_extent_io_ops = {
1015 .writepage_io_hook = btree_writepage_io_hook,