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| author | Josef Bacik <josef@redhat.com> | 2010-06-21 20:48:16 +0200 |
|---|---|---|
| committer | Josef Bacik <josef@redhat.com> | 2010-10-28 21:59:09 +0200 |
| commit | 0af3d00bad38d3bb9912a60928ad0669f17bdb76 (patch) | |
| tree | abbf4c773138a33dcde483ac60f016c4b5e55dcc /fs/btrfs/free-space-cache.h | |
| parent | Linux 2.6.36 (diff) | |
| download | linux-0af3d00bad38d3bb9912a60928ad0669f17bdb76.tar.xz linux-0af3d00bad38d3bb9912a60928ad0669f17bdb76.zip | |
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.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/fs/btrfs/free-space-cache.h b/fs/btrfs/free-space-cache.h index 890a8e79011b..45be29e5f01e 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, |