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xfs: punch delalloc extents from the COW fork for COW writes

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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@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Carlos Maiolino <cem@kernel.org>
This commit is contained in:
Christoph Hellwig 2024-10-08 10:59:21 +02:00 committed by Carlos Maiolino
parent 7d6fe5c586
commit f6f91d290c
1 changed files with 5 additions and 3 deletions
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8
fs/xfs/xfs_iomap.c
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@ -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