On Thu, May 08, 2014 at 12:11:24PM +0800, Liu Bo wrote:
> On Wed, May 07, 2014 at 02:33:18PM +0200, David Disseldorp wrote:
> > With kernel commit 00fdf13a2e9f313a044288aa59d3b8ec29ff904a, the first
> > clone-range overwrite attempt now fails with EOPNOTSUPP, rather than
> > tripping a Btrfs BUG_ON().
> >
> > This test now trips a new Btrfs bug, in which EIO is returned for
> > subsequent reads following the second clone range ioctl.
> >
>
> Hi David,
>
> Something different here, I didn't get EI on 3.15.0-rc4.
s/EI/EIO/g
-liubo
>
> thanks,
> -liubo
>
> > Signed-off-by: David Disseldorp <ddiss@xxxxxxx>
> > ---
> > tests/btrfs/035 | 11 +++++++++++
> > tests/btrfs/035.out | 5 +++++
> > 2 files changed, 16 insertions(+)
> >
> > diff --git a/tests/btrfs/035 b/tests/btrfs/035
> > index 6808179..c9530f6 100755
> > --- a/tests/btrfs/035
> > +++ b/tests/btrfs/035
> > @@ -57,21 +57,32 @@ src_str="aaaaaaaaaa"
> > echo -n "$src_str" > $SCRATCH_MNT/src
> >
> > $CLONER_PROG $SCRATCH_MNT/src $SCRATCH_MNT/src.clone1
> > +cat $SCRATCH_MNT/src.clone1
> > +echo
> >
> > src_str="bbbbbbbbbbcccccccccc"
> >
> > echo -n "$src_str" > $SCRATCH_MNT/src
> >
> > $CLONER_PROG $SCRATCH_MNT/src $SCRATCH_MNT/src.clone2
> > +cat $SCRATCH_MNT/src.clone2
> > +echo
> >
> > +# Prior to kernel commit 00fdf13a2e9f313a044288aa59d3b8ec29ff904a, this clone
> > +# resulted in a BUG_ON in __btrfs_drop_extents(). The kernel now returns
> > +# EOPNOTSUPP up to userspace.
> > snap_src_sz=`ls -lah $SCRATCH_MNT/src.clone1 | awk '{print $5}'`
> > echo "attempting ioctl (src.clone1 src)"
> > $CLONER_PROG -s 0 -d 0 -l ${snap_src_sz} \
> > $SCRATCH_MNT/src.clone1 $SCRATCH_MNT/src
> > +cat $SCRATCH_MNT/src
> > +echo
> >
> > snap_src_sz=`ls -lah $SCRATCH_MNT/src.clone2 | awk '{print $5}'`
> > echo "attempting ioctl (src.clone2 src)"
> > $CLONER_PROG -s 0 -d 0 -l ${snap_src_sz} \
> > $SCRATCH_MNT/src.clone2 $SCRATCH_MNT/src
> > +# BUG: subsequent access attempts currently result in EIO...
> > +cat $SCRATCH_MNT/src
> >
> > status=0 ; exit
> > diff --git a/tests/btrfs/035.out b/tests/btrfs/035.out
> > index f86cadf..0ea2c4f 100644
> > --- a/tests/btrfs/035.out
> > +++ b/tests/btrfs/035.out
> > @@ -1,3 +1,8 @@
> > QA output created by 035
> > +aaaaaaaaaa
> > +bbbbbbbbbbcccccccccc
> > attempting ioctl (src.clone1 src)
> > +clone failed: Operation not supported
> > +bbbbbbbbbbcccccccccc
> > attempting ioctl (src.clone2 src)
> > +bbbbbbbbbbcccccccccc
> > --
> > 1.8.4.5
> >
> --
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