xfs: stress test for shrinking free space in the last AG

This adds a stress testcase to shrink free space as much as
possible in the last AG with background fsstress workload.

The expectation is that no crash happens with expected output.

Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>

diff --git a/tests/xfs/168 b/tests/xfs/168
new file mode 100755 (executable)
index 0000000..b98e47c
--- /dev/null
+++ b/tests/xfs/168
@@ -0,0 +1,122 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2020-2021 Red Hat, Inc.  All Rights Reserved.
+#
+# FS QA Test No. 168
+#
+# XFS online shrinkfs stress test
+#
+# This test attempts to shrink unused space as much as possible with
+# background fsstress workload. It will decrease the shrink size if
+# larger size fails. And totally repeat 2 * TIME_FACTOR times.
+#
+seq=`basename $0`
+seqres=$RESULT_DIR/$seq
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1       # failure is the default!
+trap "rm -f $tmp.*; exit \$status" 0 1 2 3 15
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+create_scratch()
+{
+       _scratch_mkfs_xfs $@ | tee -a $seqres.full | \
+               _filter_mkfs 2>$tmp.mkfs >/dev/null
+       . $tmp.mkfs
+
+       _scratch_mount
+       # fix the reserve block pool to a known size so that the enospc
+       # calculations work out correctly.
+       _scratch_resvblks 1024 > /dev/null 2>&1
+}
+
+fill_scratch()
+{
+       $XFS_IO_PROG -f -c "falloc 0 $1" $SCRATCH_MNT/resvfile
+}
+
+stress_scratch()
+{
+       local procs=3
+       local nops=1000
+       # -w ensures that the only ops are ones which cause write I/O
+       local FSSTRESS_ARGS=`_scale_fsstress_args -d $SCRATCH_MNT -w \
+               -p $procs -n $nops $FSSTRESS_AVOID`
+       $FSSTRESS_PROG $FSSTRESS_ARGS >> $seqres.full 2>&1
+}
+
+# real QA test starts here
+_supported_fs xfs
+_require_scratch_xfs_shrink
+_require_xfs_io_command "falloc"
+
+rm -f $seqres.full
+_scratch_mkfs_xfs | tee -a $seqres.full | _filter_mkfs 2>$tmp.mkfs >/dev/null
+. $tmp.mkfs    # extract blocksize and data size for scratch device
+
+endsize=`expr 125 \* 1048576`  # stop after shrinking this big
+[ `expr $endsize / $dbsize` -lt $dblocks ] || _notrun "Scratch device too small"
+
+nags=2
+totalcount=$((2 * TIME_FACTOR))
+
+while [ $totalcount -gt 0 ]; do
+       size=`expr 1010 \* 1048576`     # 1010 megabytes initially
+       logblks=$(_scratch_find_xfs_min_logblocks -dsize=${size} -dagcount=${nags})
+
+       create_scratch -lsize=${logblks}b -dsize=${size} -dagcount=${nags}
+
+       for i in `seq 125 -1 90`; do
+               fillsize=`expr $i \* 1048576`
+               out="$(fill_scratch $fillsize 2>&1)"
+               echo "$out" | grep -q 'No space left on device' && continue
+               test -n "${out}" && echo "$out"
+               break
+       done
+
+       # shrink in chunks of this size at most
+       decsize=`expr  41 \* 1048576 + 1 + $RANDOM \* $RANDOM % 1048576`
+
+       while [ $size -gt $endsize ]; do
+               stress_scratch &
+               sleep 1
+
+               decb=`expr $decsize / $dbsize`    # in data blocks
+               while [ $decb -gt 0 ]; do
+                       sizeb=`expr $size / $dbsize - $decb`
+
+                       $XFS_GROWFS_PROG -D ${sizeb} $SCRATCH_MNT \
+                               >> $seqres.full 2>&1 && break
+
+                       [ $decb -gt 100 ] && decb=`expr $decb + $RANDOM % 10`
+                       decb=`expr $decb / 2`
+               done
+
+               wait
+               [ $decb -eq 0 ] && break
+
+               # get latest dblocks
+               $XFS_INFO_PROG $SCRATCH_MNT 2>&1 | _filter_mkfs 2>$tmp.growfs >/dev/null
+               . $tmp.growfs
+
+               size=`expr $dblocks \* $dbsize`
+               _scratch_unmount
+               _scratch_xfs_repair -n >> $seqres.full 2>&1 || \
+                       _fail "xfs_repair failed with shrinking $sizeb"
+               _scratch_mount
+       done
+
+       _scratch_unmount
+       _scratch_xfs_repair -n >> $seqres.full 2>&1 || \
+               _fail "xfs_repair failed with shrinking $sizeb"
+       totalcount=`expr $totalcount - 1`
+done
+
+echo "Silence is golden"
+status=0
+exit

diff --git a/tests/xfs/168.out b/tests/xfs/168.out
new file mode 100644 (file)
index 0000000..893a41d
--- /dev/null
+++ b/tests/xfs/168.out
@@ -0,0 +1,2 @@
+QA output created by 168
+Silence is golden

diff --git a/tests/xfs/group b/tests/xfs/group
index a27f7773192b36f3c86d2894791cdb7e1c26bd10..bed7f7b845efc7728a0ab1fd6f37f0fc28208465 100644 (file)
--- a/tests/xfs/group
+++ b/tests/xfs/group
@@ -165,6 +165,7 @@
 165 rw pattern auto prealloc quick
 166 rw metadata auto quick
 167 rw metadata auto stress
+168 auto growfs shrinkfs ioctl prealloc stress
 169 auto clone
 170 rw filestreams auto quick
 171 rw filestreams