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"
32 #include "print-tree.h"
35 static int check_tree_block(struct btrfs_root *root, struct extent_buffer *buf)
37 if (extent_buffer_blocknr(buf) != btrfs_header_blocknr(buf)) {
38 printk(KERN_CRIT "buf blocknr(buf) is %llu, header is %llu\n",
39 (unsigned long long)extent_buffer_blocknr(buf),
40 (unsigned long long)btrfs_header_blocknr(buf));
47 static struct extent_io_ops btree_extent_io_ops;
49 struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
50 u64 bytenr, u32 blocksize)
52 struct inode *btree_inode = root->fs_info->btree_inode;
53 struct extent_buffer *eb;
54 eb = find_extent_buffer(&BTRFS_I(btree_inode)->io_tree,
55 bytenr, blocksize, GFP_NOFS);
59 struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
60 u64 bytenr, u32 blocksize)
62 struct inode *btree_inode = root->fs_info->btree_inode;
63 struct extent_buffer *eb;
65 eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->io_tree,
66 bytenr, blocksize, NULL, GFP_NOFS);
70 struct extent_map *btree_get_extent(struct inode *inode, struct page *page,
71 size_t page_offset, u64 start, u64 len,
74 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
75 struct extent_map *em;
79 spin_lock(&em_tree->lock);
80 em = lookup_extent_mapping(em_tree, start, len);
81 spin_unlock(&em_tree->lock);
85 em = alloc_extent_map(GFP_NOFS);
87 em = ERR_PTR(-ENOMEM);
91 em->len = i_size_read(inode);
93 em->bdev = inode->i_sb->s_bdev;
95 spin_lock(&em_tree->lock);
96 ret = add_extent_mapping(em_tree, em);
97 spin_unlock(&em_tree->lock);
110 u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len)
112 return crc32c(seed, data, len);
115 void btrfs_csum_final(u32 crc, char *result)
117 *(__le32 *)result = ~cpu_to_le32(crc);
120 static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
123 char result[BTRFS_CRC32_SIZE];
125 unsigned long cur_len;
126 unsigned long offset = BTRFS_CSUM_SIZE;
127 char *map_token = NULL;
129 unsigned long map_start;
130 unsigned long map_len;
134 len = buf->len - offset;
136 err = map_private_extent_buffer(buf, offset, 32,
138 &map_start, &map_len, KM_USER0);
140 printk("failed to map extent buffer! %lu\n",
144 cur_len = min(len, map_len - (offset - map_start));
145 crc = btrfs_csum_data(root, kaddr + offset - map_start,
149 unmap_extent_buffer(buf, map_token, KM_USER0);
151 btrfs_csum_final(crc, result);
154 int from_this_trans = 0;
156 if (root->fs_info->running_transaction &&
157 btrfs_header_generation(buf) ==
158 root->fs_info->running_transaction->transid)
161 /* FIXME, this is not good */
162 if (from_this_trans == 0 &&
163 memcmp_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE)) {
166 memcpy(&found, result, BTRFS_CRC32_SIZE);
168 read_extent_buffer(buf, &val, 0, BTRFS_CRC32_SIZE);
169 printk("btrfs: %s checksum verify failed on %llu "
170 "wanted %X found %X from_this_trans %d\n",
171 root->fs_info->sb->s_id,
172 buf->start, val, found, from_this_trans);
176 write_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE);
182 int csum_dirty_buffer(struct btrfs_root *root, struct page *page)
184 struct extent_io_tree *tree;
185 u64 start = (u64)page->index << PAGE_CACHE_SHIFT;
189 struct extent_buffer *eb;
190 tree = &BTRFS_I(page->mapping->host)->io_tree;
192 if (page->private == EXTENT_PAGE_PRIVATE)
196 len = page->private >> 2;
200 eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS);
201 read_extent_buffer_pages(tree, eb, start + PAGE_CACHE_SIZE, 1,
203 btrfs_clear_buffer_defrag(eb);
204 found_start = btrfs_header_bytenr(eb);
205 if (found_start != start) {
206 printk("warning: eb start incorrect %Lu buffer %Lu len %lu\n",
207 start, found_start, len);
211 if (eb->first_page != page) {
212 printk("bad first page %lu %lu\n", eb->first_page->index,
217 if (!PageUptodate(page)) {
218 printk("csum not up to date page %lu\n", page->index);
222 found_level = btrfs_header_level(eb);
223 csum_tree_block(root, eb, 0);
225 free_extent_buffer(eb);
230 static int btree_writepage_io_hook(struct page *page, u64 start, u64 end)
232 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
234 csum_dirty_buffer(root, page);
238 static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio)
240 struct btrfs_root *root = BTRFS_I(inode)->root;
242 offset = bio->bi_sector << 9;
243 if (offset == BTRFS_SUPER_INFO_OFFSET) {
244 bio->bi_bdev = root->fs_info->sb->s_bdev;
248 return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio);
251 static int btree_writepage(struct page *page, struct writeback_control *wbc)
253 struct extent_io_tree *tree;
254 tree = &BTRFS_I(page->mapping->host)->io_tree;
255 return extent_write_full_page(tree, page, btree_get_extent, wbc);
258 static int btree_writepages(struct address_space *mapping,
259 struct writeback_control *wbc)
261 struct extent_io_tree *tree;
262 tree = &BTRFS_I(mapping->host)->io_tree;
263 if (wbc->sync_mode == WB_SYNC_NONE) {
266 unsigned long thresh = 96 * 1024 * 1024;
268 if (wbc->for_kupdate)
271 if (current_is_pdflush()) {
272 thresh = 96 * 1024 * 1024;
274 thresh = 8 * 1024 * 1024;
276 num_dirty = count_range_bits(tree, &start, (u64)-1,
277 thresh, EXTENT_DIRTY);
278 if (num_dirty < thresh) {
282 return extent_writepages(tree, mapping, btree_get_extent, wbc);
285 int btree_readpage(struct file *file, struct page *page)
287 struct extent_io_tree *tree;
288 tree = &BTRFS_I(page->mapping->host)->io_tree;
289 return extent_read_full_page(tree, page, btree_get_extent);
292 static int btree_releasepage(struct page *page, gfp_t gfp_flags)
294 struct extent_io_tree *tree;
295 struct extent_map_tree *map;
298 tree = &BTRFS_I(page->mapping->host)->io_tree;
299 map = &BTRFS_I(page->mapping->host)->extent_tree;
300 ret = try_release_extent_mapping(map, tree, page, gfp_flags);
302 ClearPagePrivate(page);
303 set_page_private(page, 0);
304 page_cache_release(page);
309 static void btree_invalidatepage(struct page *page, unsigned long offset)
311 struct extent_io_tree *tree;
312 tree = &BTRFS_I(page->mapping->host)->io_tree;
313 extent_invalidatepage(tree, page, offset);
314 btree_releasepage(page, GFP_NOFS);
318 static int btree_writepage(struct page *page, struct writeback_control *wbc)
320 struct buffer_head *bh;
321 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
322 struct buffer_head *head;
323 if (!page_has_buffers(page)) {
324 create_empty_buffers(page, root->fs_info->sb->s_blocksize,
325 (1 << BH_Dirty)|(1 << BH_Uptodate));
327 head = page_buffers(page);
330 if (buffer_dirty(bh))
331 csum_tree_block(root, bh, 0);
332 bh = bh->b_this_page;
333 } while (bh != head);
334 return block_write_full_page(page, btree_get_block, wbc);
338 static struct address_space_operations btree_aops = {
339 .readpage = btree_readpage,
340 .writepage = btree_writepage,
341 .writepages = btree_writepages,
342 .releasepage = btree_releasepage,
343 .invalidatepage = btree_invalidatepage,
344 .sync_page = block_sync_page,
347 int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize)
349 struct extent_buffer *buf = NULL;
350 struct inode *btree_inode = root->fs_info->btree_inode;
353 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
356 read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree,
357 buf, 0, 0, btree_get_extent);
358 free_extent_buffer(buf);
362 static int close_all_devices(struct btrfs_fs_info *fs_info)
364 struct list_head *list;
365 struct list_head *next;
366 struct btrfs_device *device;
368 list = &fs_info->devices;
369 while(!list_empty(list)) {
372 device = list_entry(next, struct btrfs_device, dev_list);
379 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
382 struct extent_buffer *buf = NULL;
383 struct inode *btree_inode = root->fs_info->btree_inode;
384 struct extent_io_tree *io_tree;
388 io_tree = &BTRFS_I(btree_inode)->io_tree;
390 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
393 read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree, buf, 0, 1,
396 if (buf->flags & EXTENT_CSUM)
399 end = buf->start + PAGE_CACHE_SIZE - 1;
400 if (test_range_bit(io_tree, buf->start, end, EXTENT_CSUM, 1)) {
401 buf->flags |= EXTENT_CSUM;
405 lock_extent(io_tree, buf->start, end, GFP_NOFS);
407 if (test_range_bit(io_tree, buf->start, end, EXTENT_CSUM, 1)) {
408 buf->flags |= EXTENT_CSUM;
412 ret = csum_tree_block(root, buf, 1);
413 set_extent_bits(io_tree, buf->start, end, EXTENT_CSUM, GFP_NOFS);
414 buf->flags |= EXTENT_CSUM;
417 unlock_extent(io_tree, buf->start, end, GFP_NOFS);
421 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
422 struct extent_buffer *buf)
424 struct inode *btree_inode = root->fs_info->btree_inode;
425 if (btrfs_header_generation(buf) ==
426 root->fs_info->running_transaction->transid)
427 clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree,
432 int wait_on_tree_block_writeback(struct btrfs_root *root,
433 struct extent_buffer *buf)
435 struct inode *btree_inode = root->fs_info->btree_inode;
436 wait_on_extent_buffer_writeback(&BTRFS_I(btree_inode)->io_tree,
441 static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
442 u32 stripesize, struct btrfs_root *root,
443 struct btrfs_fs_info *fs_info,
448 root->commit_root = NULL;
449 root->sectorsize = sectorsize;
450 root->nodesize = nodesize;
451 root->leafsize = leafsize;
452 root->stripesize = stripesize;
454 root->track_dirty = 0;
456 root->fs_info = fs_info;
457 root->objectid = objectid;
458 root->last_trans = 0;
459 root->highest_inode = 0;
460 root->last_inode_alloc = 0;
464 INIT_LIST_HEAD(&root->dirty_list);
465 memset(&root->root_key, 0, sizeof(root->root_key));
466 memset(&root->root_item, 0, sizeof(root->root_item));
467 memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
468 memset(&root->root_kobj, 0, sizeof(root->root_kobj));
469 init_completion(&root->kobj_unregister);
470 root->defrag_running = 0;
471 root->defrag_level = 0;
472 root->root_key.objectid = objectid;
476 static int find_and_setup_root(struct btrfs_root *tree_root,
477 struct btrfs_fs_info *fs_info,
479 struct btrfs_root *root)
484 __setup_root(tree_root->nodesize, tree_root->leafsize,
485 tree_root->sectorsize, tree_root->stripesize,
486 root, fs_info, objectid);
487 ret = btrfs_find_last_root(tree_root, objectid,
488 &root->root_item, &root->root_key);
491 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
492 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
498 struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_fs_info *fs_info,
499 struct btrfs_key *location)
501 struct btrfs_root *root;
502 struct btrfs_root *tree_root = fs_info->tree_root;
503 struct btrfs_path *path;
504 struct extent_buffer *l;
509 root = kzalloc(sizeof(*root), GFP_NOFS);
511 return ERR_PTR(-ENOMEM);
512 if (location->offset == (u64)-1) {
513 ret = find_and_setup_root(tree_root, fs_info,
514 location->objectid, root);
522 __setup_root(tree_root->nodesize, tree_root->leafsize,
523 tree_root->sectorsize, tree_root->stripesize,
524 root, fs_info, location->objectid);
526 path = btrfs_alloc_path();
528 ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
535 read_extent_buffer(l, &root->root_item,
536 btrfs_item_ptr_offset(l, path->slots[0]),
537 sizeof(root->root_item));
538 memcpy(&root->root_key, location, sizeof(*location));
541 btrfs_release_path(root, path);
542 btrfs_free_path(path);
547 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
548 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
553 ret = btrfs_find_highest_inode(root, &highest_inode);
555 root->highest_inode = highest_inode;
556 root->last_inode_alloc = highest_inode;
561 struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
564 struct btrfs_root *root;
566 if (root_objectid == BTRFS_ROOT_TREE_OBJECTID)
567 return fs_info->tree_root;
568 if (root_objectid == BTRFS_EXTENT_TREE_OBJECTID)
569 return fs_info->extent_root;
571 root = radix_tree_lookup(&fs_info->fs_roots_radix,
572 (unsigned long)root_objectid);
576 struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
577 struct btrfs_key *location)
579 struct btrfs_root *root;
582 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
583 return fs_info->tree_root;
584 if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
585 return fs_info->extent_root;
587 root = radix_tree_lookup(&fs_info->fs_roots_radix,
588 (unsigned long)location->objectid);
592 root = btrfs_read_fs_root_no_radix(fs_info, location);
595 ret = radix_tree_insert(&fs_info->fs_roots_radix,
596 (unsigned long)root->root_key.objectid,
599 free_extent_buffer(root->node);
603 ret = btrfs_find_dead_roots(fs_info->tree_root,
604 root->root_key.objectid, root);
610 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
611 struct btrfs_key *location,
612 const char *name, int namelen)
614 struct btrfs_root *root;
617 root = btrfs_read_fs_root_no_name(fs_info, location);
624 ret = btrfs_set_root_name(root, name, namelen);
626 free_extent_buffer(root->node);
631 ret = btrfs_sysfs_add_root(root);
633 free_extent_buffer(root->node);
642 static int add_hasher(struct btrfs_fs_info *info, char *type) {
643 struct btrfs_hasher *hasher;
645 hasher = kmalloc(sizeof(*hasher), GFP_NOFS);
648 hasher->hash_tfm = crypto_alloc_hash(type, 0, CRYPTO_ALG_ASYNC);
649 if (!hasher->hash_tfm) {
653 spin_lock(&info->hash_lock);
654 list_add(&hasher->list, &info->hashers);
655 spin_unlock(&info->hash_lock);
659 struct btrfs_root *open_ctree(struct super_block *sb)
666 struct btrfs_root *extent_root = kmalloc(sizeof(struct btrfs_root),
668 struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root),
670 struct btrfs_fs_info *fs_info = kmalloc(sizeof(*fs_info),
672 struct btrfs_root *chunk_root = kmalloc(sizeof(struct btrfs_root),
674 struct btrfs_root *dev_root = kmalloc(sizeof(struct btrfs_root),
678 struct btrfs_super_block *disk_super;
680 if (!extent_root || !tree_root || !fs_info) {
684 INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_NOFS);
685 INIT_LIST_HEAD(&fs_info->trans_list);
686 INIT_LIST_HEAD(&fs_info->dead_roots);
687 INIT_LIST_HEAD(&fs_info->hashers);
688 spin_lock_init(&fs_info->hash_lock);
689 spin_lock_init(&fs_info->delalloc_lock);
690 spin_lock_init(&fs_info->new_trans_lock);
692 memset(&fs_info->super_kobj, 0, sizeof(fs_info->super_kobj));
693 init_completion(&fs_info->kobj_unregister);
694 sb_set_blocksize(sb, 4096);
695 fs_info->running_transaction = NULL;
696 fs_info->last_trans_committed = 0;
697 fs_info->tree_root = tree_root;
698 fs_info->extent_root = extent_root;
699 fs_info->chunk_root = chunk_root;
700 fs_info->dev_root = dev_root;
701 INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
702 INIT_LIST_HEAD(&fs_info->devices);
703 INIT_LIST_HEAD(&fs_info->space_info);
704 btrfs_mapping_init(&fs_info->mapping_tree);
706 fs_info->throttles = 0;
707 fs_info->mount_opt = 0;
708 fs_info->max_extent = (u64)-1;
709 fs_info->max_inline = 8192 * 1024;
710 fs_info->delalloc_bytes = 0;
711 fs_info->btree_inode = new_inode(sb);
712 fs_info->btree_inode->i_ino = 1;
713 fs_info->btree_inode->i_nlink = 1;
714 fs_info->btree_inode->i_size = sb->s_bdev->bd_inode->i_size;
715 fs_info->btree_inode->i_mapping->a_ops = &btree_aops;
716 extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree,
717 fs_info->btree_inode->i_mapping,
719 extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree,
722 BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops;
724 extent_io_tree_init(&fs_info->free_space_cache,
725 fs_info->btree_inode->i_mapping, GFP_NOFS);
726 extent_io_tree_init(&fs_info->block_group_cache,
727 fs_info->btree_inode->i_mapping, GFP_NOFS);
728 extent_io_tree_init(&fs_info->pinned_extents,
729 fs_info->btree_inode->i_mapping, GFP_NOFS);
730 extent_io_tree_init(&fs_info->pending_del,
731 fs_info->btree_inode->i_mapping, GFP_NOFS);
732 extent_io_tree_init(&fs_info->extent_ins,
733 fs_info->btree_inode->i_mapping, GFP_NOFS);
734 fs_info->do_barriers = 1;
735 fs_info->closing = 0;
736 fs_info->total_pinned = 0;
737 fs_info->last_alloc = 0;
738 fs_info->last_data_alloc = 0;
740 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
741 INIT_WORK(&fs_info->trans_work, btrfs_transaction_cleaner, fs_info);
743 INIT_DELAYED_WORK(&fs_info->trans_work, btrfs_transaction_cleaner);
745 BTRFS_I(fs_info->btree_inode)->root = tree_root;
746 memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
747 sizeof(struct btrfs_key));
748 insert_inode_hash(fs_info->btree_inode);
749 mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
751 mutex_init(&fs_info->trans_mutex);
752 mutex_init(&fs_info->fs_mutex);
755 ret = add_hasher(fs_info, "crc32c");
757 printk("btrfs: failed hash setup, modprobe cryptomgr?\n");
762 __setup_root(4096, 4096, 4096, 4096, tree_root,
763 fs_info, BTRFS_ROOT_TREE_OBJECTID);
765 fs_info->sb_buffer = read_tree_block(tree_root,
766 BTRFS_SUPER_INFO_OFFSET,
769 if (!fs_info->sb_buffer)
772 read_extent_buffer(fs_info->sb_buffer, &fs_info->super_copy, 0,
773 sizeof(fs_info->super_copy));
775 read_extent_buffer(fs_info->sb_buffer, fs_info->fsid,
776 (unsigned long)btrfs_super_fsid(fs_info->sb_buffer),
779 disk_super = &fs_info->super_copy;
780 if (!btrfs_super_root(disk_super))
783 nodesize = btrfs_super_nodesize(disk_super);
784 leafsize = btrfs_super_leafsize(disk_super);
785 sectorsize = btrfs_super_sectorsize(disk_super);
786 stripesize = btrfs_super_stripesize(disk_super);
787 tree_root->nodesize = nodesize;
788 tree_root->leafsize = leafsize;
789 tree_root->sectorsize = sectorsize;
790 tree_root->stripesize = stripesize;
791 sb_set_blocksize(sb, sectorsize);
793 i_size_write(fs_info->btree_inode,
794 btrfs_super_total_bytes(disk_super));
796 if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
797 sizeof(disk_super->magic))) {
798 printk("btrfs: valid FS not found on %s\n", sb->s_id);
802 mutex_lock(&fs_info->fs_mutex);
803 ret = btrfs_read_sys_array(tree_root);
806 blocksize = btrfs_level_size(tree_root,
807 btrfs_super_chunk_root_level(disk_super));
809 __setup_root(nodesize, leafsize, sectorsize, stripesize,
810 chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
812 chunk_root->node = read_tree_block(chunk_root,
813 btrfs_super_chunk_root(disk_super),
815 BUG_ON(!chunk_root->node);
817 ret = btrfs_read_chunk_tree(chunk_root);
820 blocksize = btrfs_level_size(tree_root,
821 btrfs_super_root_level(disk_super));
824 tree_root->node = read_tree_block(tree_root,
825 btrfs_super_root(disk_super),
827 if (!tree_root->node)
831 ret = find_and_setup_root(tree_root, fs_info,
832 BTRFS_EXTENT_TREE_OBJECTID, extent_root);
835 extent_root->track_dirty = 1;
837 ret = find_and_setup_root(tree_root, fs_info,
838 BTRFS_DEV_TREE_OBJECTID, dev_root);
839 dev_root->track_dirty = 1;
842 goto fail_extent_root;
844 btrfs_read_block_groups(extent_root);
846 fs_info->generation = btrfs_super_generation(disk_super) + 1;
847 mutex_unlock(&fs_info->fs_mutex);
851 free_extent_buffer(extent_root->node);
853 mutex_unlock(&fs_info->fs_mutex);
854 free_extent_buffer(tree_root->node);
856 free_extent_buffer(fs_info->sb_buffer);
858 iput(fs_info->btree_inode);
866 int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
870 struct extent_buffer *super = root->fs_info->sb_buffer;
871 struct inode *btree_inode = root->fs_info->btree_inode;
872 struct super_block *sb = root->fs_info->sb;
874 if (!btrfs_test_opt(root, NOBARRIER))
875 blkdev_issue_flush(sb->s_bdev, NULL);
876 set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, super);
877 ret = sync_page_range_nolock(btree_inode, btree_inode->i_mapping,
878 super->start, super->len);
879 if (!btrfs_test_opt(root, NOBARRIER))
880 blkdev_issue_flush(sb->s_bdev, NULL);
884 int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
886 radix_tree_delete(&fs_info->fs_roots_radix,
887 (unsigned long)root->root_key.objectid);
889 btrfs_sysfs_del_root(root);
893 free_extent_buffer(root->node);
894 if (root->commit_root)
895 free_extent_buffer(root->commit_root);
902 static int del_fs_roots(struct btrfs_fs_info *fs_info)
905 struct btrfs_root *gang[8];
909 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
914 for (i = 0; i < ret; i++)
915 btrfs_free_fs_root(fs_info, gang[i]);
920 int close_ctree(struct btrfs_root *root)
923 struct btrfs_trans_handle *trans;
924 struct btrfs_fs_info *fs_info = root->fs_info;
926 fs_info->closing = 1;
927 btrfs_transaction_flush_work(root);
928 mutex_lock(&fs_info->fs_mutex);
929 btrfs_defrag_dirty_roots(root->fs_info);
930 trans = btrfs_start_transaction(root, 1);
931 ret = btrfs_commit_transaction(trans, root);
932 /* run commit again to drop the original snapshot */
933 trans = btrfs_start_transaction(root, 1);
934 btrfs_commit_transaction(trans, root);
935 ret = btrfs_write_and_wait_transaction(NULL, root);
937 write_ctree_super(NULL, root);
938 mutex_unlock(&fs_info->fs_mutex);
940 if (fs_info->delalloc_bytes) {
941 printk("btrfs: at unmount delalloc count %Lu\n",
942 fs_info->delalloc_bytes);
944 if (fs_info->extent_root->node)
945 free_extent_buffer(fs_info->extent_root->node);
947 if (fs_info->tree_root->node)
948 free_extent_buffer(fs_info->tree_root->node);
950 if (root->fs_info->chunk_root->node);
951 free_extent_buffer(root->fs_info->chunk_root->node);
953 if (root->fs_info->dev_root->node);
954 free_extent_buffer(root->fs_info->dev_root->node);
956 free_extent_buffer(fs_info->sb_buffer);
958 btrfs_free_block_groups(root->fs_info);
959 del_fs_roots(fs_info);
961 filemap_write_and_wait(fs_info->btree_inode->i_mapping);
963 extent_io_tree_empty_lru(&fs_info->free_space_cache);
964 extent_io_tree_empty_lru(&fs_info->block_group_cache);
965 extent_io_tree_empty_lru(&fs_info->pinned_extents);
966 extent_io_tree_empty_lru(&fs_info->pending_del);
967 extent_io_tree_empty_lru(&fs_info->extent_ins);
968 extent_io_tree_empty_lru(&BTRFS_I(fs_info->btree_inode)->io_tree);
970 truncate_inode_pages(fs_info->btree_inode->i_mapping, 0);
972 iput(fs_info->btree_inode);
974 while(!list_empty(&fs_info->hashers)) {
975 struct btrfs_hasher *hasher;
976 hasher = list_entry(fs_info->hashers.next, struct btrfs_hasher,
978 list_del(&hasher->hashers);
979 crypto_free_hash(&fs_info->hash_tfm);
983 close_all_devices(fs_info);
984 btrfs_mapping_tree_free(&fs_info->mapping_tree);
986 kfree(fs_info->extent_root);
987 kfree(fs_info->tree_root);
988 kfree(fs_info->chunk_root);
989 kfree(fs_info->dev_root);
993 int btrfs_buffer_uptodate(struct extent_buffer *buf)
995 struct inode *btree_inode = buf->first_page->mapping->host;
996 return extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, buf);
999 int btrfs_set_buffer_uptodate(struct extent_buffer *buf)
1001 struct inode *btree_inode = buf->first_page->mapping->host;
1002 return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree,
1006 void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
1008 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1009 u64 transid = btrfs_header_generation(buf);
1010 struct inode *btree_inode = root->fs_info->btree_inode;
1012 if (transid != root->fs_info->generation) {
1013 printk(KERN_CRIT "transid mismatch buffer %llu, found %Lu running %Lu\n",
1014 (unsigned long long)buf->start,
1015 transid, root->fs_info->generation);
1018 set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, buf);
1021 void btrfs_throttle(struct btrfs_root *root)
1023 struct backing_dev_info *bdi;
1025 bdi = root->fs_info->sb->s_bdev->bd_inode->i_mapping->backing_dev_info;
1026 if (root->fs_info->throttles && bdi_write_congested(bdi)) {
1027 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18)
1028 congestion_wait(WRITE, HZ/20);
1030 blk_congestion_wait(WRITE, HZ/20);
1035 void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
1037 balance_dirty_pages_ratelimited_nr(
1038 root->fs_info->btree_inode->i_mapping, 1);
1041 void btrfs_set_buffer_defrag(struct extent_buffer *buf)
1043 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1044 struct inode *btree_inode = root->fs_info->btree_inode;
1045 set_extent_bits(&BTRFS_I(btree_inode)->io_tree, buf->start,
1046 buf->start + buf->len - 1, EXTENT_DEFRAG, GFP_NOFS);
1049 void btrfs_set_buffer_defrag_done(struct extent_buffer *buf)
1051 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1052 struct inode *btree_inode = root->fs_info->btree_inode;
1053 set_extent_bits(&BTRFS_I(btree_inode)->io_tree, buf->start,
1054 buf->start + buf->len - 1, EXTENT_DEFRAG_DONE,
1058 int btrfs_buffer_defrag(struct extent_buffer *buf)
1060 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1061 struct inode *btree_inode = root->fs_info->btree_inode;
1062 return test_range_bit(&BTRFS_I(btree_inode)->io_tree,
1063 buf->start, buf->start + buf->len - 1, EXTENT_DEFRAG, 0);
1066 int btrfs_buffer_defrag_done(struct extent_buffer *buf)
1068 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1069 struct inode *btree_inode = root->fs_info->btree_inode;
1070 return test_range_bit(&BTRFS_I(btree_inode)->io_tree,
1071 buf->start, buf->start + buf->len - 1,
1072 EXTENT_DEFRAG_DONE, 0);
1075 int btrfs_clear_buffer_defrag_done(struct extent_buffer *buf)
1077 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1078 struct inode *btree_inode = root->fs_info->btree_inode;
1079 return clear_extent_bits(&BTRFS_I(btree_inode)->io_tree,
1080 buf->start, buf->start + buf->len - 1,
1081 EXTENT_DEFRAG_DONE, GFP_NOFS);
1084 int btrfs_clear_buffer_defrag(struct extent_buffer *buf)
1086 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1087 struct inode *btree_inode = root->fs_info->btree_inode;
1088 return clear_extent_bits(&BTRFS_I(btree_inode)->io_tree,
1089 buf->start, buf->start + buf->len - 1,
1090 EXTENT_DEFRAG, GFP_NOFS);
1093 int btrfs_read_buffer(struct extent_buffer *buf)
1095 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1096 struct inode *btree_inode = root->fs_info->btree_inode;
1097 return read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree,
1098 buf, 0, 1, btree_get_extent);
1101 static struct extent_io_ops btree_extent_io_ops = {
1102 .writepage_io_hook = btree_writepage_io_hook,
1103 .submit_bio_hook = btree_submit_bio_hook,