Re: [PATCH v2] generic/392: add a testcase to check some inline truncation behaviors

[Eryu Guan <eguan@redhat.com>]

On Thu, Nov 17, 2016 at 10:04:36AM -0800, Jaegeuk Kim wrote:
> This patch introduces a new testcase to test some small truncations to check
> inline_data and its cached data are truncated correctly at the same time.
> 
> The inline_data feature was introduced in ext4 and f2fs as follows.
>  ext4 : http://lwn.net/Articles/468678/
>  f2fs : http://lwn.net/Articles/573408/
> 
> The basic idea is embedding small-sized file's data into relatively large
> inode space.
> In ext4, up to 132 bytes of data can be stored in 256 bytes-sized inode.
> In f2fs, up to 3.4KB of data can be embedded into 4KB-sized inode block.
> 
> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
> ---
>  tests/generic/392     | 128 ++++++++++++++++++++++++++++++++++++++++++++++++++
>  tests/generic/392.out |  45 ++++++++++++++++++
>  tests/generic/group   |   1 +
>  3 files changed, 174 insertions(+)
>  create mode 100644 tests/generic/392
>  create mode 100644 tests/generic/392.out
> 
> diff --git a/tests/generic/392 b/tests/generic/392
> new file mode 100644
> index 0000000..c45018a
> --- /dev/null
> +++ b/tests/generic/392
> @@ -0,0 +1,128 @@
> +#! /bin/bash
> +# FS QA Test No. generic/392
> +#
> +# Test some small truncations to check inline_data and its cached data are
> +# truncated correctly at the same time.
> +#
> +# The inline_data feature was introduced in ext4 and f2fs as follows.
> +#  ext4 : http://lwn.net/Articles/468678/
> +#  f2fs : http://lwn.net/Articles/573408/
> +#
> +# The basic idea is embedding small-sized file's data into relatively large
> +# inode space.
> +# In ext4, up to 132 bytes of data can be stored in 256 bytes-sized inode.
> +# In f2fs, up to 3.4KB of data can be embedded into 4KB-sized inode block.
> +#
> +#-----------------------------------------------------------------------
> +# Copyright (c) 2014 Jaegeuk Kim.  All Rights Reserved.
> +#
> +# 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 $tmp.*
> +}
> +
> +# get standard environment, filters and checks
> +. ./common/rc
> +. ./common/filter
> +
> +_supported_fs generic
> +_supported_os Linux
> +_require_scratch
> +
> +testfile=$SCRATCH_MNT/testfile
> +OD_CMD="od -A x -t x1z"

This passed my test now. Thanks!

> +
> +_scratch_mkfs > /dev/null 2>&1
> +_scratch_mount
> +
> +# 1. make a file containing inline_data.
> +# 2. "truncated 0"  is to check cached page #0 was truncated entirely.
> +# 3. "truncated 50" is to check inline_data was truncated within its inode.
> +$XFS_IO_PROG -t -f \
> +	-c "pwrite -S 0x58 0 40" `# write    |XXXXXXXXXXXXXXXXXXXXXXXX|` \
> +	-c "fsync"							 \
> +	-c "truncate 0"          `# truncate |                        |` \
> +	-c "truncate 50"         `# truncate |                        |` \
> +$testfile | _filter_xfs_io
> +
> +echo "= truncate inline_data after #0 page was truncated entirely ="
> +$OD_CMD $testfile
> +_scratch_remount

Seems you missed my comments on this "_scratch_remount".
_scratch_remount without any arguments is a no-op, do you mean
_scratch_cycle_mount here?

Thanks
Eryu