On Fri, Aug 18, 2017 at 10:51:56AM +0200, Carlos Maiolino wrote:
> Tests the search algorithm for a free inode slot in a specific AG, done
> in xfs_dialloc_ag_inobt().
>
> When finobt is not used, and agi->freecount is not 0, XFS will scan the AG inode
> tree looking for a free inode slot, but if agi->freecount is corrupted,
> and there is no free slot at all, it will end up in an infinite loop.
>
> This test checks for the infinite loop fix.
>
> Signed-off-by: Carlos Maiolino <cmaiolino@xxxxxxxxxx>
> ---
>
> Changelog:
>
> V2:
> - Small clean up
> - use _disable_dmesg_check (the test will generate error
> messages which will appear in dmesg)
> - Get the amount of free inodes from the AGI instead of assuming
> 61 free inodes
> - Send a few outputs to $seqres.full
> - Use xfs_db `write` without -d option once this will create
> incompatibility with previous xfsprogs, and is not strictly
> required for the test to work.
> - Check for finobt, and explicitly disable it if it is
> supported by the kernel being tested.
>
> V3:
> - use _scratch_xfs_db helper
> - ensure the test is only run on kernel with no XFS_DEBUG
Why does !debug matter?
--D
>
> tests/xfs/057 | 87 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
> tests/xfs/057.out | 2 ++
> tests/xfs/group | 1 +
> 3 files changed, 90 insertions(+)
> create mode 100755 tests/xfs/057
> create mode 100644 tests/xfs/057.out
>
> diff --git a/tests/xfs/057 b/tests/xfs/057
> new file mode 100755
> index 00000000..2c866435
> --- /dev/null
> +++ b/tests/xfs/057
> @@ -0,0 +1,87 @@
> +#! /bin/bash
> +# FS QA Test 057
> +#
> +# Check if the filesystem will lockup when trying to allocate a new inode in
> +# an AG with no free inodes but with a corrupted agi->freecount showing free inodes.
> +#
> +# At the end of the test, the scratch device will purposely be in a corrupted
> +# state, so there is no need for checking that.
> +#-----------------------------------------------------------------------
> +# Copyright (c) 2017 Red Hat, Inc. 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
> +
> +# remove previous $seqres.full before test
> +rm -f $seqres.full
> +
> +# real QA test starts here
> +
> +# Modify as appropriate.
> +_supported_fs generic
> +_supported_os Linux
> +_require_scratch_nocheck
> +_require_no_xfs_debug
> +_disable_dmesg_check
> +
> +# Make sure we disable finobt if the filesystem supports it, otherwise, just
> +# initialize it with default options.
> +_scratch_mkfs | grep -q "finobt=1" && _scratch_mkfs -m "finobt=0" >/dev/null 2>&1
> +
> +# Get the amount of free inodes from the AGI 0, so we can fill up the freecount
> +# structure.
> +freecount=`_scratch_xfs_db -c "agi 0" -c "p freecount" | cut -d' ' -f 3`
> +
> +_scratch_mount
> +
> +# At the end of filesystem's initialization, AG 0 will have $freecount free
> +# inodes in the agi->freecount, create $freecount extra dummy files to fill it.
> +for i in `seq 1 $freecount`; do
> + touch $SCRATCH_MNT/dummy_file$i
> +done
> +
> +_scratch_unmount >/dev/null 2>&1
> +
> +# agi->freecount is 0 here, corrupt it to show extra free inodes
> +_scratch_xfs_db -x -c "agi 0" -c "write freecount 10" $SCRATCH_DEV >> $seqres.full 2>&1
> +
> +_scratch_mount
> +
> +# Lock up a buggy kernel
> +touch $SCRATCH_MNT/lockupfile >> $seqres.full 2>&1
> +
> +# If we reach this point, the filesystem is fixed
> +echo "Silence is golden"
> +status=0
> +exit
> diff --git a/tests/xfs/057.out b/tests/xfs/057.out
> new file mode 100644
> index 00000000..185023c7
> --- /dev/null
> +++ b/tests/xfs/057.out
> @@ -0,0 +1,2 @@
> +QA output created by 057
> +Silence is golden
> diff --git a/tests/xfs/group b/tests/xfs/group
> index cf876a29..37e4e641 100644
> --- a/tests/xfs/group
> +++ b/tests/xfs/group
> @@ -54,6 +54,7 @@
> 054 auto quick
> 055 dump ioctl remote tape
> 056 dump ioctl auto quick
> +057 auto quick fuzzers dangerous
> 059 dump ioctl auto quick
> 060 dump ioctl auto quick
> 061 dump ioctl auto quick
> --
> 2.13.5
>
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