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xfs: remove a racy if_bytes check in xfs_reflink_end_cow_extent

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commit 86de848403 upstream.

Accessing if_bytes without the ilock is racy.  Remove the initial
if_bytes == 0 check in xfs_reflink_end_cow_extent and let
ext_iext_lookup_extent fail for this case after we've taken the ilock.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>
Signed-off-by: Catherine Hoang <catherine.hoang@oracle.com>
Acked-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christoph Hellwig 2024-10-15 17:11:08 -07:00 committed by Greg Kroah-Hartman
parent 4bcef72d96
commit c299188b44
1 changed files with 0 additions and 6 deletions
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6
fs/xfs/xfs_reflink.c
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@ -716,12 +716,6 @@ xfs_reflink_end_cow_extent(
int nmaps;
int error;
/* No COW extents? That's easy! */
if (ifp->if_bytes == 0) {
*offset_fsb = end_fsb;
return 0;
}
resblks = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK);
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks, 0,
XFS_TRANS_RESERVE, &tp);