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authorLiu Bo <bo.li.liu@oracle.com>2012-09-05 19:10:51 -0600
committerChris Mason <chris.mason@fusionio.com>2012-10-01 15:19:15 -0400
commit9e8a4a8b0b9484e8d14674fc62c9ad8ac9dbce5b (patch)
treed1c2cc07c1d016b6d9e8352a41247e1da2778f28 /fs/btrfs/extent_io.h
parent3d6b5c3b5c0b970ce8a9d3bac6854f5c0ce0295a (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.h2
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,