linux-ext4 - How to run xfstests against multipath disks on SuSE?

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Date:	Mon, 26 Nov 2012 08:00:05 +0800
From:	Ryan Wang <openspace.wang@...il.com>
To:	linux-ext4@...r.kernel.org, "Theodore Ts'o" <tytso@....edu>
Subject: How to run xfstests against multipath disks on SuSE?

Hello,

I tried to kick off xfstests on multipath device, e.g I set
TEST_DEV="/dev/mapper/mpatha", which is a symlink
to "/dev/dm-0". I run mkfs on mpatha beforehand.

When I run "./check 001", it said:
"
common.rc: Error: $TEST_DEV (/dev/dm-0) is not a MOUNTED ext4 filesystem
"

The I checked the script common.rc, and found that it uses
df to determine the filesystem type and it uses the realpath
"/dev/dm-0" instead of "/dev/mapper/mpatha", while df always
shows "devtmpfs" instead of "ext4" for /dev/dm-0.

I run "mount" and found that devtmpfs is mount on /dev/ on opensuse
***by default***. Even though  I run "mount -t btrfs /dev/dm-0 /somedir",
df still showed devtmpfs.

Any ideas to kick off the xfstests?

thanks,
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