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xfs: map unwritten blocks in XFS_IOC_{ALLOC,FREE}SP just like fallocate
commit 983d8e6 upstream. The old ALLOCSP/FREESP ioctls in XFS can be used to preallocate space at the end of files, just like fallocate and RESVSP. Make the behavior consistent with the other ioctls. Reported-by: Kirill Tkhai <ktkhai@virtuozzo.com> Signed-off-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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