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| author | Liu Bo <bo.li.liu@oracle.com> | 2012-09-05 19:10:51 -0600 |
|---|---|---|
| committer | Chris Mason <chris.mason@fusionio.com> | 2012-10-01 15:19:15 -0400 |
| commit | 9e8a4a8b0b9484e8d14674fc62c9ad8ac9dbce5b (patch) | |
| tree | d1c2cc07c1d016b6d9e8352a41247e1da2778f28 /fs/btrfs/extent_io.h | |
| parent | 3d6b5c3b5c0b970ce8a9d3bac6854f5c0ce0295a (diff) | |
Btrfs: use flag EXTENT_DEFRAG for snapshot-aware defrag
We're going to use this flag EXTENT_DEFRAG to indicate which range
belongs to defragment so that we can implement snapshow-aware defrag:
We set the EXTENT_DEFRAG flag when dirtying the extents that need
defragmented, so later on writeback thread can differentiate between
normal writeback and writeback started by defragmentation.
Original-Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Diffstat (limited to 'fs/btrfs/extent_io.h')
| -rw-r--r-- | fs/btrfs/extent_io.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h index 25900af5b15..512f8da041f 100644 --- a/fs/btrfs/extent_io.h +++ b/fs/btrfs/extent_io.h @@ -235,6 +235,8 @@ int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, int bits, int clear_bits, gfp_t mask); int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end, struct extent_state **cached_state, gfp_t mask); +int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end, + struct extent_state **cached_state, gfp_t mask); int find_first_extent_bit(struct extent_io_tree *tree, u64 start, u64 *start_ret, u64 *end_ret, int bits); struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree, |