[PATCH] generic: prohibit fstrim on journalled filesystems with norecovery

Darrick J. Wong
2019-03-23T00:35:41Z

From: Darrick J. Wong <darrick.wong@oracle.com>

This test makes sure that we can't use stale unrecovered fs metadata to
drive a DISCARD festival on a disk and thereby destroy user data by
accident.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
tests/generic/714 | 61 +++++++++++++++++++++++++++++++++++++++++++++++++
tests/generic/714.out | 4 +++
tests/generic/group | 1 +
3 files changed, 66 insertions(+)
create mode 100755 tests/generic/714
create mode 100644 tests/generic/714.out

diff --git a/tests/generic/714 b/tests/generic/714
new file mode 100755
index 00000000..1849a5e9
--- /dev/null
+++ b/tests/generic/714
@@ -0,0 +1,61 @@
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0+
+# Copyright (c) 2019, Oracle and/or its affiliates. All Rights Reserved.
+#
+# FS QA Test No. 714
+#
+# Ensure that we can't call fstrim on filesystems mounted norecovery, because
+# FSTRIM implementations use free space metadata to drive the discard requests
+# and we told the filesystem not to make sure the metadata are up to date.
+
+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 -rf $tmp.*
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+
+# real QA test starts here
+_supported_os Linux
+_require_scratch
+_require_fstrim
+
+rm -f $seqres.full
+
+_scratch_mkfs > $seqres.full 2>&1
+_require_metadata_journaling $SCRATCH_DEV
+
+echo "fstrim on regular mount"
+_scratch_mount >> $seqres.full 2>&1
+$FSTRIM_PROG -v $SCRATCH_MNT >> $seqres.full 2>&1 || \
+ _notrun "FSTRIM not supported"
+_scratch_unmount
+
+echo "fstrim on ro mount"
+_scratch_mount -o ro >> $seqres.full 2>&1
+$FSTRIM_PROG -v $SCRATCH_MNT >> $seqres.full 2>&1
+_scratch_unmount
+
+echo "fstrim on ro mount with no log replay"
+norecovery="norecovery"
+test $FSTYP = "btrfs" && norecovery=nologreplay
+_scratch_mount -o ro,$norecovery >> $seqres.full 2>&1
+$FSTRIM_PROG -v $SCRATCH_MNT >> $seqres.full 2>&1 && \
+ echo "fstrim with unrecovered metadata just ate your filesystem"
+_scratch_unmount
+
+# success, all done
+status=0
+exit
diff --git a/tests/generic/714.out b/tests/generic/714.out
new file mode 100644
index 00000000..1158a2ff
--- /dev/null
+++ b/tests/generic/714.out
@@ -0,0 +1,4 @@
+QA output created by 714
+fstrim on regular mount
+fstrim on ro mount
+fstrim on ro mount with no log replay
diff --git a/tests/generic/group b/tests/generic/group
index 2e4341fb..c2046293 100644
--- a/tests/generic/group
+++ b/tests/generic/group
@@ -538,6 +538,7 @@
533 auto quick attr
534 auto quick log
535 auto quick log
+714 auto trim
940 auto quick clone punch
941 auto quick clone punch
942 auto quick clone punch