linux-ext4 - Re: [PATCH] generic: test bug when zero range is crossing isize within single block

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Date:	Mon, 27 Apr 2015 12:08:03 +0800
From:	Eryu Guan <eguan@...hat.com>
To:	Lukas Czerner <lczerner@...hat.com>
Cc:	fstests@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: [PATCH] generic: test bug when zero range is crossing isize
 within single block

On Fri, Apr 24, 2015 at 04:38:29PM +0200, Lukas Czerner wrote:
> Exercise the situation that cause ext4 to BUG_ON() when we use
> zero range to zero a range which starts within the isize but ends
> past the isize but still in the same block. This particular problem
> has only been seen on systems with page_size > block_size.
> 
> This tests exercises the problem fixed in kernel with commit
> a94b84e9ea3922220ae8bd654f6cb202904bbcac
> ext4: Allocate entire range in zero range

Seems the commit id is 0f2af21aae11972fa924374ddcf52e88347cf5a8 in Linus tree

Tested with 1k block size ext4 without the kernel patch, ext4 hit BUG_ON
as expected. xfs and btrfs passed this test.

Reviewed-by: Eryu Guan <eguan@...hat.com>

(with two minor comments inline)

> 
> Signed-off-by: Lukas Czerner <lczerner@...hat.com>
> ---
>  tests/generic/084     | 60 +++++++++++++++++++++++++++++++++++++++++++++++++++
>  tests/generic/084.out |  1 +
>  tests/generic/group   |  1 +
>  3 files changed, 62 insertions(+)
>  create mode 100644 tests/generic/084

Change mode to 755? So git won't report mode chage after running the test

>  create mode 100644 tests/generic/084.out
> 
> diff --git a/tests/generic/084 b/tests/generic/084
> new file mode 100644
> index 0000000..5066b14
> --- /dev/null
> +++ b/tests/generic/084
> @@ -0,0 +1,60 @@
> +#! /bin/bash
> +# FS QA Test 084
> +#
> +# Exercise the situation that cause ext4 to BUG_ON() when we use
> +# zero range to zero a range which starts within the isize but ends
> +# past the isize but still in the same block. This particular problem
> +# has only been seen on systems with page_size > block_size.
> +#
> +#-----------------------------------------------------------------------
> +# Copyright (c) 2015 Red Hat, Inc., Lukas Czerner <lczerner@...hat.com>
> +#
> +# This program is free software; you can redistribute it and/or
> +# modify it under the terms of the GNU General Public License as
> +# published by the Free Software Foundation.
> +#
> +# This program is distributed in the hope that it would be useful,
> +# but WITHOUT ANY WARRANTY; without even the implied warranty of
> +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> +# GNU General Public License for more details.
> +#
> +# You should have received a copy of the GNU General Public License
> +# along with this program; if not, write the Free Software Foundation,
> +# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
> +#-----------------------------------------------------------------------
> +#
> +
> +seq=`basename $0`
> +seqres=$RESULT_DIR/$seq
> +echo "QA output created by $seq"
> +
> +here=`pwd`
> +tmp=/tmp/$$
> +status=1	# failure is the default!
> +trap "_cleanup; exit \$status" 0 1 2 3 15
> +
> +_cleanup()
> +{
> +	cd /
> +	rm -f $tmp.*
> +}
> +
> +# get standard environment, filters and checks
> +. ./common/rc
> +. ./common/filter
> +
> +# real QA test starts here
> +
> +# Modify as appropriate.
> +_supported_fs generic
> +_supported_os IRIX Linux
> +_require_test
> +_require_xfs_io_command "fzero"
> +
> +testfile=$TEST_DIR/$seq.$$
> +
> +$XFS_IO_PROG -f -c "pwrite 4096 512" -c "fzero 4351 512" $testfile > $seqres.full 2>&1
> +
> +# success, all done
> +status=0
> +exit
> diff --git a/tests/generic/084.out b/tests/generic/084.out
> new file mode 100644
> index 0000000..d0aa380
> --- /dev/null
> +++ b/tests/generic/084.out
> @@ -0,0 +1 @@
> +QA output created by 084

Add "Silence is golden" to indicate no output from test is expected?

Thanks,
Eryu
> diff --git a/tests/generic/group b/tests/generic/group
> index c6ea3d8..6cb7dc3 100644
> --- a/tests/generic/group
> +++ b/tests/generic/group
> @@ -86,6 +86,7 @@
>  081 auto quick
>  082 auto prealloc preallocrw quick
>  083 rw auto enospc stress
> +084 auto prealloc quick
>  088 perms auto quick
>  089 metadata auto
>  091 rw auto quick
> -- 
> 1.8.3.1
> 
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