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->fs_devices->devices;
369 list_for_each(next, list) {
370 device = list_entry(next, struct btrfs_device, dev_list);
371 if (device->bdev && device->bdev != fs_info->sb->s_bdev)
372 close_bdev_excl(device->bdev);
378 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
381 struct extent_buffer *buf = NULL;
382 struct inode *btree_inode = root->fs_info->btree_inode;
383 struct extent_io_tree *io_tree;
387 io_tree = &BTRFS_I(btree_inode)->io_tree;
389 buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
392 read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree, buf, 0, 1,
395 if (buf->flags & EXTENT_CSUM)
398 end = buf->start + PAGE_CACHE_SIZE - 1;
399 if (test_range_bit(io_tree, buf->start, end, EXTENT_CSUM, 1)) {
400 buf->flags |= EXTENT_CSUM;
404 lock_extent(io_tree, buf->start, end, GFP_NOFS);
406 if (test_range_bit(io_tree, buf->start, end, EXTENT_CSUM, 1)) {
407 buf->flags |= EXTENT_CSUM;
411 ret = csum_tree_block(root, buf, 1);
412 set_extent_bits(io_tree, buf->start, end, EXTENT_CSUM, GFP_NOFS);
413 buf->flags |= EXTENT_CSUM;
416 unlock_extent(io_tree, buf->start, end, GFP_NOFS);
420 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
421 struct extent_buffer *buf)
423 struct inode *btree_inode = root->fs_info->btree_inode;
424 if (btrfs_header_generation(buf) ==
425 root->fs_info->running_transaction->transid)
426 clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree,
431 int wait_on_tree_block_writeback(struct btrfs_root *root,
432 struct extent_buffer *buf)
434 struct inode *btree_inode = root->fs_info->btree_inode;
435 wait_on_extent_buffer_writeback(&BTRFS_I(btree_inode)->io_tree,
440 static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
441 u32 stripesize, struct btrfs_root *root,
442 struct btrfs_fs_info *fs_info,
447 root->commit_root = NULL;
448 root->sectorsize = sectorsize;
449 root->nodesize = nodesize;
450 root->leafsize = leafsize;
451 root->stripesize = stripesize;
453 root->track_dirty = 0;
455 root->fs_info = fs_info;
456 root->objectid = objectid;
457 root->last_trans = 0;
458 root->highest_inode = 0;
459 root->last_inode_alloc = 0;
463 INIT_LIST_HEAD(&root->dirty_list);
464 memset(&root->root_key, 0, sizeof(root->root_key));
465 memset(&root->root_item, 0, sizeof(root->root_item));
466 memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
467 memset(&root->root_kobj, 0, sizeof(root->root_kobj));
468 init_completion(&root->kobj_unregister);
469 root->defrag_running = 0;
470 root->defrag_level = 0;
471 root->root_key.objectid = objectid;
475 static int find_and_setup_root(struct btrfs_root *tree_root,
476 struct btrfs_fs_info *fs_info,
478 struct btrfs_root *root)
483 __setup_root(tree_root->nodesize, tree_root->leafsize,
484 tree_root->sectorsize, tree_root->stripesize,
485 root, fs_info, objectid);
486 ret = btrfs_find_last_root(tree_root, objectid,
487 &root->root_item, &root->root_key);
490 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
491 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
497 struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_fs_info *fs_info,
498 struct btrfs_key *location)
500 struct btrfs_root *root;
501 struct btrfs_root *tree_root = fs_info->tree_root;
502 struct btrfs_path *path;
503 struct extent_buffer *l;
508 root = kzalloc(sizeof(*root), GFP_NOFS);
510 return ERR_PTR(-ENOMEM);
511 if (location->offset == (u64)-1) {
512 ret = find_and_setup_root(tree_root, fs_info,
513 location->objectid, root);
521 __setup_root(tree_root->nodesize, tree_root->leafsize,
522 tree_root->sectorsize, tree_root->stripesize,
523 root, fs_info, location->objectid);
525 path = btrfs_alloc_path();
527 ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
534 read_extent_buffer(l, &root->root_item,
535 btrfs_item_ptr_offset(l, path->slots[0]),
536 sizeof(root->root_item));
537 memcpy(&root->root_key, location, sizeof(*location));
540 btrfs_release_path(root, path);
541 btrfs_free_path(path);
546 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
547 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
552 ret = btrfs_find_highest_inode(root, &highest_inode);
554 root->highest_inode = highest_inode;
555 root->last_inode_alloc = highest_inode;
560 struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
563 struct btrfs_root *root;
565 if (root_objectid == BTRFS_ROOT_TREE_OBJECTID)
566 return fs_info->tree_root;
567 if (root_objectid == BTRFS_EXTENT_TREE_OBJECTID)
568 return fs_info->extent_root;
570 root = radix_tree_lookup(&fs_info->fs_roots_radix,
571 (unsigned long)root_objectid);
575 struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
576 struct btrfs_key *location)
578 struct btrfs_root *root;
581 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
582 return fs_info->tree_root;
583 if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
584 return fs_info->extent_root;
586 root = radix_tree_lookup(&fs_info->fs_roots_radix,
587 (unsigned long)location->objectid);
591 root = btrfs_read_fs_root_no_radix(fs_info, location);
594 ret = radix_tree_insert(&fs_info->fs_roots_radix,
595 (unsigned long)root->root_key.objectid,
598 free_extent_buffer(root->node);
602 ret = btrfs_find_dead_roots(fs_info->tree_root,
603 root->root_key.objectid, root);
609 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
610 struct btrfs_key *location,
611 const char *name, int namelen)
613 struct btrfs_root *root;
616 root = btrfs_read_fs_root_no_name(fs_info, location);
623 ret = btrfs_set_root_name(root, name, namelen);
625 free_extent_buffer(root->node);
630 ret = btrfs_sysfs_add_root(root);
632 free_extent_buffer(root->node);
641 static int add_hasher(struct btrfs_fs_info *info, char *type) {
642 struct btrfs_hasher *hasher;
644 hasher = kmalloc(sizeof(*hasher), GFP_NOFS);
647 hasher->hash_tfm = crypto_alloc_hash(type, 0, CRYPTO_ALG_ASYNC);
648 if (!hasher->hash_tfm) {
652 spin_lock(&info->hash_lock);
653 list_add(&hasher->list, &info->hashers);
654 spin_unlock(&info->hash_lock);
659 static int btrfs_congested_fn(void *congested_data, int bdi_bits)
661 struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data;
663 struct list_head *cur;
664 struct btrfs_device *device;
665 struct backing_dev_info *bdi;
667 list_for_each(cur, &info->fs_devices->devices) {
668 device = list_entry(cur, struct btrfs_device, dev_list);
669 bdi = blk_get_backing_dev_info(device->bdev);
670 if (bdi && bdi_congested(bdi, bdi_bits)) {
678 void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
680 struct list_head *cur;
681 struct btrfs_device *device;
682 struct btrfs_fs_info *info;
684 info = (struct btrfs_fs_info *)bdi->unplug_io_data;
685 list_for_each(cur, &info->fs_devices->devices) {
686 device = list_entry(cur, struct btrfs_device, dev_list);
687 bdi = blk_get_backing_dev_info(device->bdev);
688 if (bdi->unplug_io_fn) {
689 bdi->unplug_io_fn(bdi, page);
694 static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi)
697 bdi->ra_pages = default_backing_dev_info.ra_pages;
699 bdi->capabilities = default_backing_dev_info.capabilities;
700 bdi->unplug_io_fn = btrfs_unplug_io_fn;
701 bdi->unplug_io_data = info;
702 bdi->congested_fn = btrfs_congested_fn;
703 bdi->congested_data = info;
707 struct btrfs_root *open_ctree(struct super_block *sb,
708 struct btrfs_fs_devices *fs_devices)
715 struct btrfs_root *extent_root = kmalloc(sizeof(struct btrfs_root),
717 struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root),
719 struct btrfs_fs_info *fs_info = kmalloc(sizeof(*fs_info),
721 struct btrfs_root *chunk_root = kmalloc(sizeof(struct btrfs_root),
723 struct btrfs_root *dev_root = kmalloc(sizeof(struct btrfs_root),
727 struct btrfs_super_block *disk_super;
729 if (!extent_root || !tree_root || !fs_info) {
733 INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_NOFS);
734 INIT_LIST_HEAD(&fs_info->trans_list);
735 INIT_LIST_HEAD(&fs_info->dead_roots);
736 INIT_LIST_HEAD(&fs_info->hashers);
737 spin_lock_init(&fs_info->hash_lock);
738 spin_lock_init(&fs_info->delalloc_lock);
739 spin_lock_init(&fs_info->new_trans_lock);
741 memset(&fs_info->super_kobj, 0, sizeof(fs_info->super_kobj));
742 init_completion(&fs_info->kobj_unregister);
743 sb_set_blocksize(sb, 4096);
744 fs_info->running_transaction = NULL;
745 fs_info->last_trans_committed = 0;
746 fs_info->tree_root = tree_root;
747 fs_info->extent_root = extent_root;
748 fs_info->chunk_root = chunk_root;
749 fs_info->dev_root = dev_root;
750 fs_info->fs_devices = fs_devices;
751 INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
752 INIT_LIST_HEAD(&fs_info->space_info);
753 btrfs_mapping_init(&fs_info->mapping_tree);
755 fs_info->throttles = 0;
756 fs_info->mount_opt = 0;
757 fs_info->max_extent = (u64)-1;
758 fs_info->max_inline = 8192 * 1024;
759 fs_info->delalloc_bytes = 0;
760 setup_bdi(fs_info, &fs_info->bdi);
761 fs_info->btree_inode = new_inode(sb);
762 fs_info->btree_inode->i_ino = 1;
763 fs_info->btree_inode->i_nlink = 1;
764 fs_info->btree_inode->i_size = sb->s_bdev->bd_inode->i_size;
765 fs_info->btree_inode->i_mapping->a_ops = &btree_aops;
766 fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi;
768 extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree,
769 fs_info->btree_inode->i_mapping,
771 extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree,
774 BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops;
776 extent_io_tree_init(&fs_info->free_space_cache,
777 fs_info->btree_inode->i_mapping, GFP_NOFS);
778 extent_io_tree_init(&fs_info->block_group_cache,
779 fs_info->btree_inode->i_mapping, GFP_NOFS);
780 extent_io_tree_init(&fs_info->pinned_extents,
781 fs_info->btree_inode->i_mapping, GFP_NOFS);
782 extent_io_tree_init(&fs_info->pending_del,
783 fs_info->btree_inode->i_mapping, GFP_NOFS);
784 extent_io_tree_init(&fs_info->extent_ins,
785 fs_info->btree_inode->i_mapping, GFP_NOFS);
786 fs_info->do_barriers = 1;
787 fs_info->closing = 0;
788 fs_info->total_pinned = 0;
789 fs_info->last_alloc = 0;
790 fs_info->last_data_alloc = 0;
791 fs_info->extra_alloc_bits = 0;
792 fs_info->extra_data_alloc_bits = 0;
794 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
795 INIT_WORK(&fs_info->trans_work, btrfs_transaction_cleaner, fs_info);
797 INIT_DELAYED_WORK(&fs_info->trans_work, btrfs_transaction_cleaner);
799 BTRFS_I(fs_info->btree_inode)->root = tree_root;
800 memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
801 sizeof(struct btrfs_key));
802 insert_inode_hash(fs_info->btree_inode);
803 mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
805 mutex_init(&fs_info->trans_mutex);
806 mutex_init(&fs_info->fs_mutex);
809 ret = add_hasher(fs_info, "crc32c");
811 printk("btrfs: failed hash setup, modprobe cryptomgr?\n");
816 __setup_root(4096, 4096, 4096, 4096, tree_root,
817 fs_info, BTRFS_ROOT_TREE_OBJECTID);
819 fs_info->sb_buffer = read_tree_block(tree_root,
820 BTRFS_SUPER_INFO_OFFSET,
823 if (!fs_info->sb_buffer)
826 read_extent_buffer(fs_info->sb_buffer, &fs_info->super_copy, 0,
827 sizeof(fs_info->super_copy));
829 read_extent_buffer(fs_info->sb_buffer, fs_info->fsid,
830 (unsigned long)btrfs_super_fsid(fs_info->sb_buffer),
833 disk_super = &fs_info->super_copy;
834 if (!btrfs_super_root(disk_super))
837 if (btrfs_super_num_devices(disk_super) != fs_devices->num_devices) {
838 printk("Btrfs: wanted %llu devices, but found %llu\n",
839 (unsigned long long)btrfs_super_num_devices(disk_super),
840 (unsigned long long)fs_devices->num_devices);
843 nodesize = btrfs_super_nodesize(disk_super);
844 leafsize = btrfs_super_leafsize(disk_super);
845 sectorsize = btrfs_super_sectorsize(disk_super);
846 stripesize = btrfs_super_stripesize(disk_super);
847 tree_root->nodesize = nodesize;
848 tree_root->leafsize = leafsize;
849 tree_root->sectorsize = sectorsize;
850 tree_root->stripesize = stripesize;
851 sb_set_blocksize(sb, sectorsize);
853 i_size_write(fs_info->btree_inode,
854 btrfs_super_total_bytes(disk_super));
856 if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
857 sizeof(disk_super->magic))) {
858 printk("btrfs: valid FS not found on %s\n", sb->s_id);
862 mutex_lock(&fs_info->fs_mutex);
864 ret = btrfs_read_sys_array(tree_root);
867 blocksize = btrfs_level_size(tree_root,
868 btrfs_super_chunk_root_level(disk_super));
870 __setup_root(nodesize, leafsize, sectorsize, stripesize,
871 chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
873 chunk_root->node = read_tree_block(chunk_root,
874 btrfs_super_chunk_root(disk_super),
876 BUG_ON(!chunk_root->node);
878 ret = btrfs_read_chunk_tree(chunk_root);
881 blocksize = btrfs_level_size(tree_root,
882 btrfs_super_root_level(disk_super));
885 tree_root->node = read_tree_block(tree_root,
886 btrfs_super_root(disk_super),
888 if (!tree_root->node)
892 ret = find_and_setup_root(tree_root, fs_info,
893 BTRFS_EXTENT_TREE_OBJECTID, extent_root);
896 extent_root->track_dirty = 1;
898 ret = find_and_setup_root(tree_root, fs_info,
899 BTRFS_DEV_TREE_OBJECTID, dev_root);
900 dev_root->track_dirty = 1;
903 goto fail_extent_root;
905 btrfs_read_block_groups(extent_root);
907 fs_info->generation = btrfs_super_generation(disk_super) + 1;
908 mutex_unlock(&fs_info->fs_mutex);
912 free_extent_buffer(extent_root->node);
914 mutex_unlock(&fs_info->fs_mutex);
915 free_extent_buffer(tree_root->node);
917 free_extent_buffer(fs_info->sb_buffer);
919 iput(fs_info->btree_inode);
921 close_all_devices(fs_info);
928 int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
932 struct extent_buffer *super = root->fs_info->sb_buffer;
933 struct inode *btree_inode = root->fs_info->btree_inode;
934 struct super_block *sb = root->fs_info->sb;
936 if (!btrfs_test_opt(root, NOBARRIER))
937 blkdev_issue_flush(sb->s_bdev, NULL);
938 set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, super);
939 ret = sync_page_range_nolock(btree_inode, btree_inode->i_mapping,
940 super->start, super->len);
941 if (!btrfs_test_opt(root, NOBARRIER))
942 blkdev_issue_flush(sb->s_bdev, NULL);
946 int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
948 radix_tree_delete(&fs_info->fs_roots_radix,
949 (unsigned long)root->root_key.objectid);
951 btrfs_sysfs_del_root(root);
955 free_extent_buffer(root->node);
956 if (root->commit_root)
957 free_extent_buffer(root->commit_root);
964 static int del_fs_roots(struct btrfs_fs_info *fs_info)
967 struct btrfs_root *gang[8];
971 ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix,
976 for (i = 0; i < ret; i++)
977 btrfs_free_fs_root(fs_info, gang[i]);
982 int close_ctree(struct btrfs_root *root)
985 struct btrfs_trans_handle *trans;
986 struct btrfs_fs_info *fs_info = root->fs_info;
988 fs_info->closing = 1;
989 btrfs_transaction_flush_work(root);
990 mutex_lock(&fs_info->fs_mutex);
991 btrfs_defrag_dirty_roots(root->fs_info);
992 trans = btrfs_start_transaction(root, 1);
993 ret = btrfs_commit_transaction(trans, root);
994 /* run commit again to drop the original snapshot */
995 trans = btrfs_start_transaction(root, 1);
996 btrfs_commit_transaction(trans, root);
997 ret = btrfs_write_and_wait_transaction(NULL, root);
999 write_ctree_super(NULL, root);
1000 mutex_unlock(&fs_info->fs_mutex);
1002 if (fs_info->delalloc_bytes) {
1003 printk("btrfs: at unmount delalloc count %Lu\n",
1004 fs_info->delalloc_bytes);
1006 if (fs_info->extent_root->node)
1007 free_extent_buffer(fs_info->extent_root->node);
1009 if (fs_info->tree_root->node)
1010 free_extent_buffer(fs_info->tree_root->node);
1012 if (root->fs_info->chunk_root->node);
1013 free_extent_buffer(root->fs_info->chunk_root->node);
1015 if (root->fs_info->dev_root->node);
1016 free_extent_buffer(root->fs_info->dev_root->node);
1018 free_extent_buffer(fs_info->sb_buffer);
1020 btrfs_free_block_groups(root->fs_info);
1021 del_fs_roots(fs_info);
1023 filemap_write_and_wait(fs_info->btree_inode->i_mapping);
1025 extent_io_tree_empty_lru(&fs_info->free_space_cache);
1026 extent_io_tree_empty_lru(&fs_info->block_group_cache);
1027 extent_io_tree_empty_lru(&fs_info->pinned_extents);
1028 extent_io_tree_empty_lru(&fs_info->pending_del);
1029 extent_io_tree_empty_lru(&fs_info->extent_ins);
1030 extent_io_tree_empty_lru(&BTRFS_I(fs_info->btree_inode)->io_tree);
1032 truncate_inode_pages(fs_info->btree_inode->i_mapping, 0);
1034 iput(fs_info->btree_inode);
1036 while(!list_empty(&fs_info->hashers)) {
1037 struct btrfs_hasher *hasher;
1038 hasher = list_entry(fs_info->hashers.next, struct btrfs_hasher,
1040 list_del(&hasher->hashers);
1041 crypto_free_hash(&fs_info->hash_tfm);
1045 close_all_devices(fs_info);
1046 btrfs_mapping_tree_free(&fs_info->mapping_tree);
1047 bdi_destroy(&fs_info->bdi);
1049 kfree(fs_info->extent_root);
1050 kfree(fs_info->tree_root);
1051 kfree(fs_info->chunk_root);
1052 kfree(fs_info->dev_root);
1056 int btrfs_buffer_uptodate(struct extent_buffer *buf)
1058 struct inode *btree_inode = buf->first_page->mapping->host;
1059 return extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, buf);
1062 int btrfs_set_buffer_uptodate(struct extent_buffer *buf)
1064 struct inode *btree_inode = buf->first_page->mapping->host;
1065 return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree,
1069 void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
1071 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1072 u64 transid = btrfs_header_generation(buf);
1073 struct inode *btree_inode = root->fs_info->btree_inode;
1075 if (transid != root->fs_info->generation) {
1076 printk(KERN_CRIT "transid mismatch buffer %llu, found %Lu running %Lu\n",
1077 (unsigned long long)buf->start,
1078 transid, root->fs_info->generation);
1081 set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, buf);
1084 void btrfs_throttle(struct btrfs_root *root)
1086 struct backing_dev_info *bdi;
1088 bdi = root->fs_info->sb->s_bdev->bd_inode->i_mapping->backing_dev_info;
1089 if (root->fs_info->throttles && bdi_write_congested(bdi)) {
1090 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18)
1091 congestion_wait(WRITE, HZ/20);
1093 blk_congestion_wait(WRITE, HZ/20);
1098 void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
1100 balance_dirty_pages_ratelimited_nr(
1101 root->fs_info->btree_inode->i_mapping, 1);
1104 void btrfs_set_buffer_defrag(struct extent_buffer *buf)
1106 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1107 struct inode *btree_inode = root->fs_info->btree_inode;
1108 set_extent_bits(&BTRFS_I(btree_inode)->io_tree, buf->start,
1109 buf->start + buf->len - 1, EXTENT_DEFRAG, GFP_NOFS);
1112 void btrfs_set_buffer_defrag_done(struct extent_buffer *buf)
1114 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1115 struct inode *btree_inode = root->fs_info->btree_inode;
1116 set_extent_bits(&BTRFS_I(btree_inode)->io_tree, buf->start,
1117 buf->start + buf->len - 1, EXTENT_DEFRAG_DONE,
1121 int btrfs_buffer_defrag(struct extent_buffer *buf)
1123 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1124 struct inode *btree_inode = root->fs_info->btree_inode;
1125 return test_range_bit(&BTRFS_I(btree_inode)->io_tree,
1126 buf->start, buf->start + buf->len - 1, EXTENT_DEFRAG, 0);
1129 int btrfs_buffer_defrag_done(struct extent_buffer *buf)
1131 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1132 struct inode *btree_inode = root->fs_info->btree_inode;
1133 return test_range_bit(&BTRFS_I(btree_inode)->io_tree,
1134 buf->start, buf->start + buf->len - 1,
1135 EXTENT_DEFRAG_DONE, 0);
1138 int btrfs_clear_buffer_defrag_done(struct extent_buffer *buf)
1140 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1141 struct inode *btree_inode = root->fs_info->btree_inode;
1142 return clear_extent_bits(&BTRFS_I(btree_inode)->io_tree,
1143 buf->start, buf->start + buf->len - 1,
1144 EXTENT_DEFRAG_DONE, GFP_NOFS);
1147 int btrfs_clear_buffer_defrag(struct extent_buffer *buf)
1149 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1150 struct inode *btree_inode = root->fs_info->btree_inode;
1151 return clear_extent_bits(&BTRFS_I(btree_inode)->io_tree,
1152 buf->start, buf->start + buf->len - 1,
1153 EXTENT_DEFRAG, GFP_NOFS);
1156 int btrfs_read_buffer(struct extent_buffer *buf)
1158 struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
1159 struct inode *btree_inode = root->fs_info->btree_inode;
1160 return read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree,
1161 buf, 0, 1, btree_get_extent);
1164 static struct extent_io_ops btree_extent_io_ops = {
1165 .writepage_io_hook = btree_writepage_io_hook,
1166 .submit_bio_hook = btree_submit_bio_hook,
1167 /* note we're sharing with inode.c for the merge bio hook */
1168 .merge_bio_hook = btrfs_merge_bio_hook,