generic: test shutdowns of a nested filesystem

generic/475, but we're running fsstress on a disk image inside the
scratch filesystem

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Eryu Guan <guaneryu@gmail.com>
Reviewed-by: Zorro Lang <zlang@redhat.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>

diff --git a/common/rc b/common/rc
index 9dc6df9450cadda511cae45cfa1821e80d47867b..154bc2dd7e94f7d014034246070ee68f38131328 100644 (file)
--- a/common/rc
+++ b/common/rc
@@ -631,6 +631,30 @@ _ext4_metadump()
                $DUMP_COMPRESSOR -f "$dumpfile" &>> "$seqres.full"
 }
 
+# Capture the metadata of a filesystem in a dump file for offline analysis.
+# This is not supported by all filesystem types, so this function should only
+# be used after a test has already failed.
+_metadump_dev() {
+       local device="$1"
+       local dumpfile="$2"
+       local compressopt="$3"
+
+       test "$DUMP_CORRUPT_FS" = 1 || return 0
+
+       case "$FSTYP" in
+       ext*)
+               _ext4_metadump $device $dumpfile $compressopt
+               ;;
+       xfs)
+               _xfs_metadump $dumpfile $device none $compressopt
+               ;;
+       *)
+               echo "Don't know how to metadump $FSTYP"
+               return 1
+               ;;
+       esac
+}
+
 _test_mkfs()
 {
     case $FSTYP in

diff --git a/tests/generic/648 b/tests/generic/648
new file mode 100755 (executable)
index 0000000..83dd111
--- /dev/null
+++ b/tests/generic/648
@@ -0,0 +1,136 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2021 Oracle, Inc.  All Rights Reserved.
+#
+# FS QA Test No. 648
+#
+# Test nested log recovery with repeated (simulated) disk failures.  We kick
+# off fsstress on a loopback filesystem mounted on the scratch fs, then switch
+# out the underlying scratch device with dm-error to see what happens when the
+# disk goes down.  Having taken down both fses in this manner, remount them and
+# repeat.  This test simulates VM hosts crashing to try to shake out CoW bugs
+# in writeback on the host that cause VM guests to fail to recover.
+#
+. ./common/preamble
+_begin_fstest shutdown auto log metadata eio recoveryloop
+
+_cleanup()
+{
+       cd /
+       $KILLALL_PROG -9 fsstress > /dev/null 2>&1
+       wait
+       if [ -n "$loopmnt" ]; then
+               $UMOUNT_PROG $loopmnt 2>/dev/null
+               rm -r -f $loopmnt
+       fi
+       rm -f $tmp.*
+       _dmerror_unmount
+       _dmerror_cleanup
+}
+
+# Import common functions.
+. ./common/dmerror
+. ./common/reflink
+
+# Modify as appropriate.
+_supported_fs generic
+
+_require_scratch_reflink
+_require_cp_reflink
+_require_dm_target error
+_require_command "$KILLALL_PROG" "killall"
+
+echo "Silence is golden."
+
+_scratch_mkfs >> $seqres.full 2>&1
+_require_metadata_journaling $SCRATCH_DEV
+_dmerror_init
+_dmerror_mount
+
+# Create a fs image consuming 1/3 of the scratch fs
+scratch_freesp_bytes=$(_get_available_space $SCRATCH_MNT)
+loopimg_bytes=$((scratch_freesp_bytes / 3))
+
+loopimg=$SCRATCH_MNT/testfs
+truncate -s $loopimg_bytes $loopimg
+_mkfs_dev $loopimg
+
+loopmnt=$tmp.mount
+mkdir -p $loopmnt
+
+scratch_aliveflag=$tmp.runsnap
+snap_aliveflag=$tmp.snapping
+
+snap_loop_fs() {
+       touch "$snap_aliveflag"
+       while [ -e "$scratch_aliveflag" ]; do
+               rm -f $loopimg.a
+               _cp_reflink $loopimg $loopimg.a
+               sleep 1
+       done
+       rm -f "$snap_aliveflag"
+}
+
+fsstress=($FSSTRESS_PROG $FSSTRESS_AVOID -d "$loopmnt" -n 999999 -p "$((LOAD_FACTOR * 4))")
+
+for i in $(seq 1 $((25 * TIME_FACTOR)) ); do
+       touch $scratch_aliveflag
+       snap_loop_fs >> $seqres.full 2>&1 &
+
+       if ! _mount $loopimg $loopmnt -o loop; then
+               rm -f $scratch_aliveflag
+               _metadump_dev $loopimg $seqres.loop.$i.md
+               _fail "iteration $i loopimg mount failed"
+               break
+       fi
+
+       ("${fsstress[@]}" >> $seqres.full &) > /dev/null 2>&1
+
+       # purposely include 0 second sleeps to test shutdown immediately after
+       # recovery
+       sleep $((RANDOM % (3 * TIME_FACTOR) ))
+       rm -f $scratch_aliveflag
+
+       # This test aims to simulate sudden disk failure, which means that we
+       # do not want to quiesce the filesystem or otherwise give it a chance
+       # to flush its logs.  Therefore we want to call dmsetup with the
+       # --nolockfs parameter; to make this happen we must call the load
+       # error table helper *without* 'lockfs'.
+       _dmerror_load_error_table
+
+       ps -e | grep fsstress > /dev/null 2>&1
+       while [ $? -eq 0 ]; do
+               $KILLALL_PROG -9 fsstress > /dev/null 2>&1
+               wait > /dev/null 2>&1
+               ps -e | grep fsstress > /dev/null 2>&1
+       done
+       for ((i = 0; i < 10; i++)); do
+               test -e "$snap_aliveflag" || break
+               sleep 1
+       done
+
+       # Mount again to replay log after loading working table, so we have a
+       # consistent fs after test.
+       $UMOUNT_PROG $loopmnt
+       _dmerror_unmount || _fail "iteration $i scratch unmount failed"
+       _dmerror_load_working_table
+       if ! _dmerror_mount; then
+               _metadump_dev $DMERROR_DEV $seqres.scratch.$i.md
+               _fail "iteration $i scratch mount failed"
+       fi
+done
+
+# Make sure the fs image file is ok
+if [ -f "$loopimg" ]; then
+       if _mount $loopimg $loopmnt -o loop; then
+               $UMOUNT_PROG $loopmnt &> /dev/null
+       else
+               _metadump_dev $DMERROR_DEV $seqres.scratch.final.md
+               echo "final scratch mount failed"
+       fi
+       SCRATCH_RTDEV= SCRATCH_LOGDEV= _check_scratch_fs $loopimg
+fi
+
+# success, all done; let the test harness check the scratch fs
+status=0
+exit

diff --git a/tests/generic/648.out b/tests/generic/648.out
new file mode 100644 (file)
index 0000000..c4afc21
--- /dev/null
+++ b/tests/generic/648.out
@@ -0,0 +1,2 @@
+QA output created by 648
+Silence is golden.