Re: [PATCH 11/11] xfs: Stress test with with bmap_alloc_minlen_extent error tag enabled

[Chandan Babu R <chandanrlinux@gmail.com>]

On Saturday 14 November 2020 5:36:02 AM IST Darrick J. Wong wrote:
> On Fri, Nov 13, 2020 at 04:57:03PM +0530, Chandan Babu R wrote:
> > This commit adds a stress test that executes fsstress with
> > bmap_alloc_minlen_extent error tag enabled.
> > 
> > Signed-off-by: Chandan Babu R <chandanrlinux@gmail.com>
> > ---
> >  tests/xfs/531     | 85 +++++++++++++++++++++++++++++++++++++++++++++++
> >  tests/xfs/531.out |  6 ++++
> >  tests/xfs/group   |  1 +
> >  3 files changed, 92 insertions(+)
> >  create mode 100755 tests/xfs/531
> >  create mode 100644 tests/xfs/531.out
> > 
> > diff --git a/tests/xfs/531 b/tests/xfs/531
> > new file mode 100755
> > index 00000000..e846cc0e
> > --- /dev/null
> > +++ b/tests/xfs/531
> > @@ -0,0 +1,85 @@
> > +#! /bin/bash
> > +# SPDX-License-Identifier: GPL-2.0
> > +# Copyright (c) 2020 Chandan Babu R.  All Rights Reserved.
> > +#
> > +# FS QA Test 531
> > +#
> > +# Execute fsstress with bmap_alloc_minlen_extent error tag enabled.
> > +#
> > +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
> > +. ./common/inject
> > +
> > +# remove previous $seqres.full before test
> > +rm -f $seqres.full
> > +
> > +# real QA test starts here
> > +
> > +_supported_fs xfs
> > +_require_scratch
> > +_require_xfs_debug
> > +_require_test_program "punch-alternating"
> > +_require_xfs_io_error_injection "bmap_alloc_minlen_extent"
> > +
> > +echo "Format and mount fs"
> > +_scratch_mkfs_sized $((1024 * 1024 * 1024)) >> $seqres.full
> 
> Why is a 1G fs required?

With the sparse file occupying almost half of the filesystem space, fsstress
will have only remaining half of the space to work with. With 1GiB sized
filesystem, fsstress can have ~512MiB of free space.

> 
> > +_scratch_mount >> $seqres.full
> > +
> > +bsize=$(_get_block_size $SCRATCH_MNT)
> > +
> > +testfile=$SCRATCH_MNT/testfile
> > +
> > +echo "Consume free space"
> > +dd if=/dev/zero of=${testfile} bs=${bsize} >> $seqres.full 2>&1
> > +sync
> > +
> > +echo "Create fragmented filesystem"
> > +$here/src/punch-alternating $testfile >> $seqres.full
> > +sync
> > +
> > +echo "Inject bmap_alloc_minlen_extent error tag"
> > +xfs_io -x -c 'inject bmap_alloc_minlen_extent' $SCRATCH_MNT
> > +
> > +echo "Execute fsstress in background"
> > +$FSSTRESS_PROG -d $SCRATCH_MNT -p128 -n999999999 \
> 
> -n and -p ought to be computed from TIME_FACTOR and LOAD_FACTOR.

Ok. I will fix that.

> 
> --D
> 
> > +		 -f bulkstat=0 \
> > +		 -f bulkstat1=0 \
> > +		 -f fiemap=0 \
> > +		 -f getattr=0 \
> > +		 -f getdents=0 \
> > +		 -f getfattr=0 \
> > +		 -f listfattr=0 \
> > +		 -f mread=0 \
> > +		 -f read=0 \
> > +		 -f readlink=0 \
> > +		 -f readv=0 \
> > +		 -f stat=0 \
> > +		 -f aread=0 \
> > +		 -f dread=0 > /dev/null 2>&1 &
> > +
> > +fsstress_pid=$!
> > +sleep 2m
> > +
> > +echo "Killing fsstress process $fsstress_pid ..." >> $seqres.full
> > +kill $fsstress_pid >> $seqres.full
> > +wait $fsstress_pid
> > +
> > +# success, all done
> > +status=0
> > +exit
> > diff --git a/tests/xfs/531.out b/tests/xfs/531.out
> > new file mode 100644
> > index 00000000..e0a419c2
> > --- /dev/null
> > +++ b/tests/xfs/531.out
> > @@ -0,0 +1,6 @@
> > +QA output created by 531
> > +Format and mount fs
> > +Consume free space
> > +Create fragmented filesystem
> > +Inject bmap_alloc_minlen_extent error tag
> > +Execute fsstress in background
> > diff --git a/tests/xfs/group b/tests/xfs/group
> > index 81a15582..f4cb5af6 100644
> > --- a/tests/xfs/group
> > +++ b/tests/xfs/group
> > @@ -528,3 +528,4 @@
> >  528 auto quick reflink
> >  529 auto quick reflink
> >  530 auto quick
> > +531 auto stress
> 


-- 
chandan