On 1/18/13 3:48 PM, Koen De Wit wrote:
> Signed-off-by: Koen De Wit <koen.de.wit@xxxxxxxxxx>
>
> ---
> 300 | 84
> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> 300.out | 4 +++
> 2 files changed, 88 insertions(+), 0 deletions(-)
> create mode 100644 300
> create mode 100644 300.out
>
> diff --git a/300 b/300
> new file mode 100644
> index 0000000..a6f706c
> --- /dev/null
> +++ b/300
> @@ -0,0 +1,84 @@
> +#! /bin/bash
> +# FS QA Test No. 300
> +#
> +# Diskspace consumption of sparse file clones ("reflinks") on btrfs
> +# - Check that a reflink does not consume space
> +# - Check that a reflink starts to consume space when the original file
> +# is modified
> +# - Check that diskspace is freed up after deleting all files
> +#
> +#-----------------------------------------------------------------------
> +# Copyright (c) 2013, Oracle and/or its affiliates. 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
> +#-----------------------------------------------------------------------
> +#
> +# creator
> +owner=koen.de.wit@xxxxxxxxxx
> +
> +seq=`basename $0`
> +echo "QA output created by $seq"
> +
> +here=`pwd`
> +tmp=/tmp/$$
> +status=1 # failure is the default!
> +trap "_cleanup; exit \$status" 0 1 2 3 15
> +
> +_cleanup()
> +{
> + cd /
> + rm -f $tmp.*
> +}
> +
> +# get standard environment, filters and checks
> +. ./common.rc
> +. ./common.filter
> +
> +# real QA test starts here
> +_supported_fs btrfs
> +_supported_os Linux
> +
> +_require_cp_reflink
need def'n
> +TESTDIR1=$TEST_DIR/test-$seq.$$
> +mkdir $TESTDIR1
possible clash if pids cycle?
> +_free() {
> + _df_dir $TEST_DIR | $AWK_PROG '{ print $5 }'
> +}
> +
> +free_before=`_free`
> +$XFS_IO_PROG -f -c "pwrite -S 0x61 0 10m" -c "fsync" $TESTDIR1/original
> > /dev/null
patch wrapped. FWIW sometimes redirecting to $seq.full rather than
/dev/null makes it easier to see what's happened if anything goes wrong.
> +cp --reflink=always $TESTDIR1/original $TESTDIR1/copy1
> +cp --reflink=auto $TESTDIR1/copy1 $TESTDIR1/copy2
> +btrfs filesystem sync $TEST_DIR > /dev/null
> +free_after_creating_reflinks=`_free`
> +_within_tolerance "free space after creating 1 file and 2 reflinks" \
> + `expr $free_before - $free_after_creating_reflinks` 10252 512 -v
> +
A comment about what's being checked here might help, unfortunately
the _within_tolerance helper is a little cryptic.
why should the difference be 10252, out of curiosity? Does that depend
on block size or anything?
> +$XFS_IO_PROG -c "pwrite -S 0x62 3m 5m" -c "fsync" $TESTDIR1/original >
> /dev/null
patch wrapped :)
> +btrfs filesystem sync $TEST_DIR > /dev/null
> +free_after_overwriting=`_free`
> +_within_tolerance "free space after overwriting original file" \
> + `expr $free_before - $free_after_overwriting` 15376 512 -v
Ok, so you overwrote 5 megs of the original 10 meg file now.
So this is checking that the difference is within 512 bytes
newly-consumed space against . . . 15376 what? It'd just be nice
to have a comment for future readers.
I wonder if comparing to $free_after_creating_reflinks would
be clearer, so the space used is just that space used for
the new data?
> +rm $TESTDIR1/original $TESTDIR1/copy1 $TESTDIR1/copy2
> +btrfs filesystem sync $TEST_DIR > /dev/null
> +free_after_removing=`_free`
> +_within_tolerance "free space after removing all files" \
> + `expr $free_before - $free_after_removing` 0 128 -v
This makes sense, make sure we're back to the original.
Is the 128 slop even necessary?
Need to add this test to groups as well.
Thanks,
-Eric
> +
> +# success, all done
> +status=0
> +exit
> diff --git a/300.out b/300.out
> new file mode 100644
> index 0000000..bbb94f4
> --- /dev/null
> +++ b/300.out
> @@ -0,0 +1,4 @@
> +QA output created by 300
> +free space after creating 1 file and 2 reflinks is in range
> +free space after overwriting original file is in range
> +free space after removing all files is in range
>
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