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authorJosef Bacik <josef@redhat.com>2010-06-21 14:48:16 -0400
committerJosef Bacik <josef@redhat.com>2010-10-28 15:59:09 -0400
commit0af3d00bad38d3bb9912a60928ad0669f17bdb76 (patch)
treeabbf4c773138a33dcde483ac60f016c4b5e55dcc /fs/btrfs/free-space-cache.h
parentf6f94e2ab1b33f0082ac22d71f66385a60d8157f (diff)
downloadop-kernel-dev-0af3d00bad38d3bb9912a60928ad0669f17bdb76.zip
op-kernel-dev-0af3d00bad38d3bb9912a60928ad0669f17bdb76.tar.gz
Btrfs: create special free space cache inode
In order to save free space cache, we need an inode to hold the data, and we need a special item to point at the right inode for the right block group. So first, create a special item that will point to the right inode, and the number of extent entries we will have and the number of bitmaps we will have. We truncate and pre-allocate space everytime to make sure it's uptodate. This feature will be turned on as soon as you mount with -o space_cache, however it is safe to boot into old kernels, they will just generate the cache the old fashion way. When you boot back into a newer kernel we will notice that we modified and not the cache and automatically discard the cache. Signed-off-by: Josef Bacik <josef@redhat.com>
Diffstat (limited to 'fs/btrfs/free-space-cache.h')
-rw-r--r--fs/btrfs/free-space-cache.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/fs/btrfs/free-space-cache.h b/fs/btrfs/free-space-cache.h
index 890a8e7..45be29e 100644
--- a/fs/btrfs/free-space-cache.h
+++ b/fs/btrfs/free-space-cache.h
@@ -27,6 +27,17 @@ struct btrfs_free_space {
struct list_head list;
};
+struct inode *lookup_free_space_inode(struct btrfs_root *root,
+ struct btrfs_block_group_cache
+ *block_group, struct btrfs_path *path);
+int create_free_space_inode(struct btrfs_root *root,
+ struct btrfs_trans_handle *trans,
+ struct btrfs_block_group_cache *block_group,
+ struct btrfs_path *path);
+int btrfs_truncate_free_space_cache(struct btrfs_root *root,
+ struct btrfs_trans_handle *trans,
+ struct btrfs_path *path,
+ struct inode *inode);
int btrfs_add_free_space(struct btrfs_block_group_cache *block_group,
u64 bytenr, u64 size);
int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group,
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