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xfs: add missing error check in xfs_prepare_shift() 

xfs_prepare_shift() fails to check the error return from
xfs_flush_unmap_range(). If the latter fails, that could lead to an
insert/collapse range operation over a delalloc range, which is not
supported.

Add an error check and return appropriately. This is reproduced
rarely by generic/475.

Fixes: 7f9f71be84 ("xfs: extent shifting doesn't fully invalidate page cache")
Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Allison Collins <allison.henderson@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Brian Foster 2019-04-26 07:30:24 -07:00 committed by Darrick J. Wong
parent 47cd97b5b2
commit 1749d1ea89
1 changed files with 2 additions and 0 deletions
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2
fs/xfs/xfs_bmap_util.c
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@ -1193,6 +1193,8 @@ xfs_prepare_shift(
* about to shift down every extent from offset to EOF.
*/
error = xfs_flush_unmap_range(ip, offset, XFS_ISIZE(ip));
if (error)
return error;
/*
* Clean out anything hanging around in the cow fork now that