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Btrfs: use flag EXTENT_DEFRAG for snapshot-aware defrag

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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>
This commit is contained in:
Liu Bo
2012-09-05 19:10:51 -06:00
committed by Chris Mason
parent 3d6b5c3b5c
commit 9e8a4a8b0b
5 changed files with 28 additions and 14 deletions
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8
fs/btrfs/extent_io.c
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@@ -1144,6 +1144,14 @@ int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
NULL, cached_state, mask);
}
int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end,
struct extent_state **cached_state, gfp_t mask)
{
return set_extent_bit(tree, start, end,
EXTENT_DELALLOC | EXTENT_UPTODATE | EXTENT_DEFRAG,
NULL, cached_state, mask);
}
int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
gfp_t mask)
{