On Thu, Jan 12, 2017 at 09:02:25AM +0100, Roman Penyaev wrote:
> On Thu, Jan 12, 2017 at 5:08 AM, Eryu Guan <eguan@xxxxxxxxxx> wrote:
> > On Wed, Jan 11, 2017 at 10:52:39AM +0100, Roman Pen wrote:
> >> Regression test which targets two nasty ext4 bugs in a logic which
> >> shifts extents:
> >>
> >> 1) 14d981f468a1 ("ext4: Include forgotten start block on fallocate insert range")
> >>
> >> Test tries to insert many blocks at the same offset to reproduce
> >> the following layout on ext4:
> >>
> >> block #0 block #1
> >> |ext0 ext1|ext2 ext3 ...|
> >> ^
> >> insert of a new block
> >>
> >> Because of an incorrect range first block is never reached,
> >> thus ext1 is untouched, resulting to a hole at a wrong offset:
> >>
> >> What we got:
> >>
> >> block #0 block #1
> >> |ext0 ext1| ext2 ext3 ...|
> >> ^
> >> hole at a wrong offset
> >>
> >> What we expect:
> >>
> >> block #0 block #1
> >> |ext0 ext1|ext2 ext3 ...|
> >> ^
> >> hole at a correct offset
> >>
> >> 2) 2b3864b32403 ("ext4: do not polute the extents cache while shifting extents")
> >>
> >> Extents status tree is filled in with outdated offsets while doing
> >> extent shift, that leads to wrong data blocks. That's why md5sum
> >> of a result file is being checked after each block insert.
> >
> > Thanks a lot! I did a minor update and queued it up.
> >
> >>
> >> Signed-off-by: Roman Pen <roman.penyaev@xxxxxxxxxxxxxxxx>
> >> Cc: "Theodore Ts'o <tytso@xxxxxxx>"
> >> Cc: Eryu Guan <eguan@xxxxxxxxxx>
> >> Cc: linux-ext4@xxxxxxxxxxxxxxx
> >> Cc: fstests@xxxxxxxxxxxxxxx
> >> ---
> >
> >> +# Modify as appropriate.
> >> +_supported_fs generic
> >> +_supported_os Linux
> >> +_require_test
> >> +_require_xfs_io_command "finsert"
> >> +
> >> +blksize=`get_block_size $TEST_DIR`
> >
> > I merged a patch earlier from Darrick to rename get_block_size to
> > _get_block_size. So I did the rename here too.
>
> Thanks. The only thing which worries me is those commits references.
> These patches are in Theodore's dev branch and I hope SHA1 wont be
> changed. Or maybe we have to postpone this new test till patches
> appear in mainline. I do not know.
Please cite the subject line of the patch alongside the hash.
e.g. 'This test accompanies 9a1f4e6 ("xfs: inflate colorful balloons").'
--D
>
> --
> Roman
> --
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