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Btrfs: Make free space cache code generic

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So we can re-use the code to cache free inode numbers.

The change is quite straightforward. Two new structures are introduced.

- struct btrfs_free_space_ctl

  We move those variables that are used for caching free space from
  struct btrfs_block_group_cache to this new struct.

- struct btrfs_free_space_op

  We do block group specific work (e.g. calculation of extents threshold)
  through functions registered in this struct.

And then we can remove references to struct btrfs_block_group_cache.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
This commit is contained in:
Li Zefan
2011-03-29 13:46:06 +08:00
parent f38b6e754d
commit 34d52cb6c5
4 changed files with 271 additions and 223 deletions
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7
fs/btrfs/ctree.h
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@ -830,9 +830,6 @@ struct btrfs_block_group_cache {
u64 bytes_super;
u64 flags;
u64 sectorsize;
int extents_thresh;
int free_extents;
int total_bitmaps;
unsigned int ro:1;
unsigned int dirty:1;
unsigned int iref:1;
@ -847,9 +844,7 @@ struct btrfs_block_group_cache {
struct btrfs_space_info *space_info;
/* free space cache stuff */
spinlock_t tree_lock;
struct rb_root free_space_offset;
u64 free_space;
struct btrfs_free_space_ctl *free_space_ctl;
/* block group cache stuff */
struct rb_node cache_node;