[PATCH v2] Btrfs: clear EXTENT_DEFRAG bits in finish_ordered_io

[Liu Bo <bo.li.liu@oracle.com>]

Before this, we use 'filled' mode here, ie. if all range has been
filled with EXTENT_DEFRAG bits, get to clear it, but if the defrag
range joins the adjacent delalloc range, then we'll have EXTENT_DEFRAG
bits in extent_state until releasing this inode's pages, and that
prevents extent_date from being freed.

This clears the bit if any was found within the ordered extent.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
---
v2: Improve changelog.

 fs/btrfs/inode.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 78ab511..1293810 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -2875,7 +2875,7 @@ static int btrfs_finish_ordered_io(struct btrfs_ordered_extent *ordered_extent)
 
 	ret = test_range_bit(io_tree, ordered_extent->file_offset,
 			ordered_extent->file_offset + ordered_extent->len - 1,
-			EXTENT_DEFRAG, 1, cached_state);
+			EXTENT_DEFRAG, 0, cached_state);
 	if (ret) {
 		u64 last_snapshot = btrfs_root_last_snapshot(&root->root_item);
 		if (0 && last_snapshot >= BTRFS_I(inode)->generation)
-- 
2.5.5