Some testcases may require a special rename flag, such as
RENAME_WHITEOUT, so add support check for if a given rename flag is
supported in _require_renameat2.
[Eryu: rename the helper to _require_renameat2 while we're at it,
and add 'exchange' check to generic/398 and generic/419]
Signed-off-by: kaixuxia <kaixuxia@tencent.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
There is no API documentation for RENAME_WHITEOUT. There is no
developer documentation for RENAME_WHITEOUT. There are not comments
in the overlayfs or ext4 implementation of RENAME_WHITEOUT.
Hence, this test simply tries to expose basic RENAME_WHITEOUT
behaviour from ext4 so we can reverse-engineer and verify
bug-for-bug renameat2(RENAME_WHITEOUT) ext4 compatibility.
Note: uses generic/078 just to keep out of the way of the 6-7 other
pending new tests.
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>