linux-ext4 - Re: [fstests PATCH 2/2] generic/347: dm-thin lacks DAX support

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Date:   Thu, 18 Jan 2018 12:23:43 +0800
From:   Eryu Guan <eguan@...hat.com>
To:     Ross Zwisler <ross.zwisler@...ux.intel.com>
Cc:     fstests@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-nvdimm@...ts.01.org, dave.jiang@...el.com
Subject: Re: [fstests PATCH 2/2] generic/347: dm-thin lacks DAX support

On Wed, Jan 17, 2018 at 04:23:51PM -0700, Ross Zwisler wrote:
> generic/347 currently fails when run in cojunction 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>
> ---
>  tests/generic/347 | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/tests/generic/347 b/tests/generic/347
> index 3adc6744..0c2dec98 100755
> --- a/tests/generic/347
> +++ b/tests/generic/347
> @@ -72,6 +72,7 @@ _supported_fs generic
>  _supported_os Linux
>  _require_scratch_nocheck
>  _require_dm_target thin-pool
> +_exclude_scratch_mount_option dax

IMHO, it'd be better to put this in common/dmthin file, as what's done
in common/dmerror or common/dmflakey (we grep for dax directly there,
that's because they've been added before _exclude_scratch_mount_option
was introduced), so all thinp tests are excluded from dax tests.

Thanks,
Eryu

>  
>  _setup_thin
>  _workout
> -- 
> 2.14.3
>