Hi,

> -----Original Message-----
> From: Eryu Guan [mailto:eg...@redhat.com]
> Sent: Thursday, October 26, 2017 2:52 PM
> To: Gu, Jinxiang/顾 金香 <g...@cn.fujitsu.com>
> Cc: fste...@vger.kernel.org; linux-btrfs@vger.kernel.org
> Subject: Re: [PATCH] xfstests: Add message indicating btrfs-progs support FST 
> in read-only mode
> 
> On Thu, Oct 26, 2017 at 01:57:46PM +0800, Gu Jinxiang wrote:
> > From: Gu JinXiang <g...@cn.fujitsu.com>
> >
> > btrfs-progs now support FST in read-only mode, so when space_cache=v2
> > enabled, this test case will fail.
> > Add message to help user to understand this status.
> 
> Sorry, I don't quite understand the new 'FST' feature. But is it a bug that 
> we want to fix when mounting with space_cache=v2
> option, or we just couldn't do btrfs-convert in this case? If it's a real 
> bug, I'd say let the test fail as it is, and
> track bug in tools like bugzilla not comments/messages in the test; if it's 
> the latter case, then just _notrun the test
> if space_cache=v2 option is specified, e.g.
> 
> _exclude_scratch_mount_option "space_cache=v2"
Thank you for your suggestion.
As an known behavior when use btrfs-convert when space_cache=v2 enabled, I 
prefer to modify this case not to be run.
I all send a new patch for this.

> 
> Thanks,
> Eryu
> 
> >
> > Signed-off-by: Gu JinXiang <g...@cn.fujitsu.com>
> > ---
> >  tests/btrfs/012 | 6 ++++++
> >  1 file changed, 6 insertions(+)
> >
> > diff --git a/tests/btrfs/012 b/tests/btrfs/012 index
> > 85c82f07..529e6eca 100755
> > --- a/tests/btrfs/012
> > +++ b/tests/btrfs/012
> > @@ -96,6 +96,12 @@ cp -aR /lib/modules/`uname -r`/ $SCRATCH_MNT/new
> >
> >  _scratch_unmount
> >
> > +space_cache_version=$(echo "$MOUNT_OPTIONS" | grep "space_cache=v2")
> > +if [ -n "$space_cache_version" ]; then
> > +   _fail "since used space_cache=v2 when mount," \
> > +          "and for FST btrfs-progs support is read-only."\
> > +         "so btrfs-convert rollback will fail"
> > +fi
> >  # Now restore the ext4 device
> >  $BTRFS_CONVERT_PROG -r $SCRATCH_DEV >> $seqres.full 2>&1 || \
> >     _fail "btrfs-convert rollback failed"
> > --
> > 2.13.5
> >
> >
> >
> > --
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> 



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