path: root/free-space-cache.h
diff options
authorJosef Bacik <>2013-04-04 09:57:50 -0400
committerDavid Sterba <>2013-04-23 18:56:21 +0200
commitd93cad2677613b0a31315e428ead5339612a4b1c (patch)
treebc78b1d7300f611929b4978920ac10b66fe49ebd /free-space-cache.h
parentbee9403728ce017c0b9a8384a0bcb342b331688a (diff)
Btrfs-progs: add a free space cache checker to fsck V2
In trying to track down a weird tree log problem I wanted to make sure that the free space cache was actually valid, which we currently have no way of doing. So this patch adds a bunch of support for the free space cache code and then a checker to fsck. Basically we go through and if we can actually load the free space cache then we will walk the extent tree and verify that the free space cache exactly matches what is in the extent tree. Hopefully this will always be correct, the only time it wouldn't is if the extent tree is corrupt or we have some sort of awful bug in the free space cache. Thanks, Signed-off-by: Josef Bacik <>
Diffstat (limited to 'free-space-cache.h')
1 files changed, 55 insertions, 0 deletions
diff --git a/free-space-cache.h b/free-space-cache.h
new file mode 100644
index 00000000..d2862586
--- /dev/null
+++ b/free-space-cache.h
@@ -0,0 +1,55 @@
+ * Copyright (C) 2009 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+struct btrfs_free_space {
+ struct rb_node offset_index;
+ u64 offset;
+ u64 bytes;
+ unsigned long *bitmap;
+ struct list_head list;
+struct btrfs_free_space_ctl {
+ struct rb_root free_space_offset;
+ u64 free_space;
+ int extents_thresh;
+ int free_extents;
+ int total_bitmaps;
+ int unit;
+ u64 start;
+ void *private;
+int load_free_space_cache(struct btrfs_fs_info *fs_info,
+ struct btrfs_block_group_cache *block_group);
+void __btrfs_remove_free_space_cache(struct btrfs_free_space_ctl *ctl);
+void btrfs_remove_free_space_cache(struct btrfs_block_group_cache
+ *block_group);
+void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group,
+ u64 bytes);
+struct btrfs_free_space *
+btrfs_find_free_space(struct btrfs_free_space_ctl *ctl, u64 offset, u64 bytes);
+int btrfs_init_free_space_ctl(struct btrfs_block_group_cache *block_group,
+ int sectorsize);
+void unlink_free_space(struct btrfs_free_space_ctl *ctl,
+ struct btrfs_free_space *info);