Re: [PATCH v2] fstest: btrfs: test single 4k extent after subpagesize buffered writes

[Liu Bo <bo.li.liu@oracle.com>]

On Thu, Mar 17, 2016 at 12:24:35PM +0800, Eryu Guan wrote:
> On Wed, Mar 16, 2016 at 09:13:57PM -0700, Liu Bo wrote:
> > On Tue, Mar 15, 2016 at 02:39:41PM +1100, Dave Chinner wrote:
> > > On Mon, Mar 07, 2016 at 04:27:59PM -0800, Liu Bo wrote:
> > > > This is to test if COW enabled btrfs can end up with single 4k extents
> > > > when doing subpagesize buffered writes.
> > > > 
> > > > Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
> ...
> > > > +# check for single PAGESIZE extent
> > > > +$XFS_IO_PROG -c "fiemap -v" $tfile >> $seqres.full 2>&1
> > > > +$XFS_IO_PROG -c "fiemap -v" $tfile | awk '{if ($4 == 8) print $4}'
> > > 
> > > Assumes page size is 4k. Also assumes that no individual extent in
> > > the file is 4k. Likely broken.
> > 
> > My miss, will try to come up with a way to tell awk PAGE_SIZE, maybe call getpagesize() ?
> > (if you already how to do it, please do me a favor :-) )
> 
> ./src/feature is able to do this, e.g. pagesize=`$here/src/feature -s`

It works, thanks for reminding me of that.

Thanks,

-liubo