Re: [PATCH] xfstests: add _require_freeze and minor cleanups

[Ben Myers <bpm@sgi.com>]

Hey Eric,

On Wed, Sep 19, 2012 at 05:53:56PM -0500, Eric Sandeen wrote:
> More filesystems have grown freeze capability, so rather than
> hardcoding several in _supported_fs, make tests 068 and 280
> generic and then add a new _require_freeze() which checks whether
> the fs under test can be frozen before beginning the test.
> 
> Minor other cleanups to 280:
> - remove extra _supported_fs line
> - clear $seq.full before beginning
> 
> Signed-off-by: Eric Sandeen <sandeen@redhat.com>
> ---
> 
> diff --git a/068 b/068
> index b595d1d..617420c 100755
> --- a/068
> +++ b/068
> @@ -51,10 +51,11 @@ trap "_cleanup" 0 1 2 3 15
>  . ./common.filter
>  
>  # real QA test starts here
> -_supported_fs btrfs ext3 ext4 xfs
> +_supported_fs generic
>  _supported_os Linux IRIX
>  
>  _require_scratch
> +_require_freeze
>  
>  echo "*** init FS"
>  
> diff --git a/280 b/280
> index 55849ed..5e26173 100755
> --- a/280
> +++ b/280
> @@ -45,13 +45,15 @@ _cleanup()
>  
>  _require_scratch
>  _require_quota
> +_require_freeze
>  
>  # real QA test starts here
>  
>  # Modify as appropriate.
> -_supported_fs generic
>  _supported_os Linux
> -_supported_fs ext3 ext4 xfs
> +_supported_fs generic
> +
> +rm -f $seq.full
>  
>  umount $SCRATCH_DEV 2>/dev/null
>  _scratch_mkfs >> $seq.full 2>&1
> diff --git a/common.rc b/common.rc
> index 602513a..0e8a306 100644
> --- a/common.rc
> +++ b/common.rc
> @@ -1758,6 +1758,15 @@ _require_btrfs()
>  	[ $? -eq 0 ] || _notrun "$BTRFS_UTIL_PROG too old (must support $cmd)"
>  }
>  
> +# Does freeze work on this fs?
> +_require_freeze()
> +{
> +	xfs_freeze -f "$TEST_DIR" >/dev/null 2>&1
> +	result=$? 
> +	xfs_freeze -u "$TEST_DIR" >/dev/null 2>&1
> +	[ $result -eq 0 ] || _notrun "$FSTYP does not support freezing"
> +}
> +

Pretty good idea to generalize _require_freeze.  It looks like xfs_freeze is a
script that uses xfs_io which uses xfsctl XFS_IOC_FREEZE.  So isn't what you
have here xfs specific?  It wouldn't work for the other filesystems that
implement s_op.freeze_fs:

   1   1502  btrfs/super.c <<GLOBAL>>
             .freeze_fs = btrfs_freeze,
   2    804  ext3/super.c <<GLOBAL>>
             .freeze_fs = ext3_freeze,
   3   1238  ext4/super.c <<GLOBAL>>
             .freeze_fs = ext4_freeze,
   4   1578  gfs2/super.c <<GLOBAL>>
             .freeze_fs = gfs2_freeze,
   5    760  jfs/super.c <<GLOBAL>>
             .freeze_fs = jfs_freeze,
   6    688  nilfs2/super.c <<GLOBAL>>
             .freeze_fs = nilfs_freeze,
   7    620  reiserfs/super.c <<GLOBAL>>
             .freeze_fs = reiserfs_freeze,
   8   1536  xfs/linux-2.6/xfs_super.c <<GLOBAL>>
             .freeze_fs = xfs_fs_freeze,

Maybe it would be better if we had some kind of interface to test whether
.freeze_fs is defined (if there isn't one already) rather than freeze and thaw
to find out.  Oddly freeze_super seems to just return 0 when .freeze_fs is not
defined.

Regards,
Ben

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