linux-ext4 - [fstests PATCH v2] generic/347: dm-thin lacks DAX support

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Date:   Thu, 18 Jan 2018 09:07:37 -0700
From:   Ross Zwisler <ross.zwisler@...ux.intel.com>
To:     Eryu Guan <eguan@...hat.com>, fstests@...r.kernel.org
Cc:     Ross Zwisler <ross.zwisler@...ux.intel.com>,
        linux-ext4@...r.kernel.org, linux-nvdimm@...ts.01.org,
        dave.jiang@...el.com
Subject: [fstests PATCH v2] generic/347: dm-thin lacks DAX support

generic/347 currently fails when run in conjunction with the DAX mount
option:

generic/347 72s ... - output mismatch (see
/root/project/xfstests/results//generic/347.out.bad)
    --- tests/generic/347.out	2016-05-12 11:56:32.086618744 -0600
    +++ /root/project/xfstests/results//generic/347.out.bad	2018-01-17
    16:04:33.459348448 -0700
    @@ -1,2 +1,3 @@
     QA output created by 347
    +mount: /mnt/xfstests_scratch: can't read superblock on
    /dev/mapper/thin-vol.
     === completed
    ...
    (Run 'diff -u tests/generic/347.out
    /root/project/xfstests/results//generic/347.out.bad'  to see the entire
    diff)

This is expected because the dm-thin target currently lacks DAX support.

Just skip this test if we are using DAX.

Signed-off-by: Ross Zwisler <ross.zwisler@...ux.intel.com>
---
 common/dmthin | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/common/dmthin b/common/dmthin
index baab6284..da0ad284 100644
--- a/common/dmthin
+++ b/common/dmthin
@@ -35,6 +35,11 @@ DMTHIN_POOL_DEV="/dev/mapper/$DMTHIN_POOL_NAME"
 DMTHIN_VOL_NAME="thin-vol"
 DMTHIN_VOL_DEV="/dev/mapper/$DMTHIN_VOL_NAME"
 
+echo $MOUNT_OPTIONS | grep -q dax
+if [ $? -eq 0 ]; then
+	_notrun "Cannot run tests with DAX on dmthin devices"
+fi
+
 _dmthin_cleanup()
 {
 	$UMOUNT_PROG $SCRATCH_MNT > /dev/null 2>&1
-- 
2.14.3