[PATCH] generic/258: check filesystem support for negative timestamps

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Some filesystems do not support negative c/m/atime timestamps.  And for
these filesystems, generic/258 will fail.  Since there's currently no way
to check sb->s_time_min from userspace, this patch adds a new common/rc
function _require_negative_timestamps() that will _notrun depending on the
$FSTYP variable.

Signed-off-by: Luis Henriques <lhenriques@xxxxxxxx>
---
Hi!

I'm only adding 'ceph' to the _require_negative_timestamps() case because
that was the only filesystem with s_time_min = 0 that I was able to test.
However, a simple grep indicates there are a few other filesystems that
would also be required there (e.g. nfs version < 4).

Cheers,
--
Luis

 common/rc         | 8 ++++++++
 tests/generic/258 | 1 +
 2 files changed, 9 insertions(+)

diff --git a/common/rc b/common/rc
index 0306e93cb1ca..067f30cecde7 100644
--- a/common/rc
+++ b/common/rc
@@ -4157,6 +4157,14 @@ _check_xfs_scrub_does_unicode() {
 	return 0
 }
 
+_require_negative_timestamps() {
+	case "$FSTYP" in
+	ceph)
+		_notrun "$FSTYP does not support negative timestamps"
+		;;
+	esac
+}
+
 init_rc
 
 ################################################################################
diff --git a/tests/generic/258 b/tests/generic/258
index 68b8155d4a9f..dab1a476ed20 100755
--- a/tests/generic/258
+++ b/tests/generic/258
@@ -30,6 +30,7 @@ trap "_cleanup ; exit \$status" 0 1 2 3 15
 _supported_fs generic
 _supported_os Linux
 _require_test
+_require_negative_timestamps
 
 TESTFILE=$TEST_DIR/timestamp-test.txt
 



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