When ->iomap_end is called on a short write to the COW fork it needs to
punch stale delalloc data from the COW fork and not the data fork.
Ensure that IOMAP_F_NEW is set for new COW fork allocations in
xfs_buffered_write_iomap_begin, and then use the IOMAP_F_SHARED flag
in xfs_buffered_write_delalloc_punch to decide which fork to punch.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
fs/xfs/xfs_iomap.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index 0317bbfeeb38f3..916531d9f83c2f 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -1196,7 +1196,7 @@ xfs_buffered_write_iomap_begin(
imap.br_startoff - offset_fsb);
}
- iomap_flags = IOMAP_F_SHARED;
+ iomap_flags |= IOMAP_F_SHARED;
seq = xfs_iomap_inode_sequence(ip, iomap_flags);
xfs_iunlock(ip, lockmode);
return xfs_bmbt_to_iomap(ip, iomap, &cmap, flags, iomap_flags, seq);
@@ -1213,8 +1213,10 @@ xfs_buffered_write_delalloc_punch(
loff_t length,
struct iomap *iomap)
{
- xfs_bmap_punch_delalloc_range(XFS_I(inode), XFS_DATA_FORK, offset,
- offset + length);
+ xfs_bmap_punch_delalloc_range(XFS_I(inode),
+ (iomap->flags & IOMAP_F_SHARED) ?
+ XFS_COW_FORK : XFS_DATA_FORK,
+ offset, offset + length);
}
static int
--
2.45.2
