2 # SPDX-License-Identifier: GPL-2.0
3 # Copyright (c) 2017 Red Hat, Inc. All Rights Reserved.
7 # Attempt to reproduce log recovery failure by writing corrupt log records over
8 # the last good tail in the log. The tail is force pinned while a workload runs
9 # the head as close as possible behind the tail. Once the head is pinned,
10 # corrupted log records are written to the log and the filesystem shuts down.
12 # While log recovery should handle the corrupted log records, it has historical
13 # problems dealing with the situation where the corrupted log records may have
14 # overwritten the tail of the previous good record in the log. If this occurs,
15 # log recovery may fail.
17 # This can be reproduced more reliably under non-default conditions such as with
18 # the smallest supported FSB sizes and/or largest supported log buffer sizes and
19 # counts (logbufs and logbsize mount options).
21 # Note that this test requires a DEBUG mode kernel.
24 seqres=$RESULT_DIR/$seq
25 echo "QA output created by $seq"
29 status=1 # failure is the default!
30 trap "_cleanup; exit \$status" 0 1 2 3 15
36 $KILLALL_PROG -9 fsstress > /dev/null 2>&1
37 [ -e /sys/fs/xfs/$sdev/errortag/log_item_pin ] &&
38 echo 0 > /sys/fs/xfs/$sdev/errortag/log_item_pin
44 # get standard environment, filters and checks
48 # real QA test starts here
50 # Modify as appropriate.
53 _require_xfs_io_error_injection log_item_pin
54 _require_xfs_io_error_injection log_bad_crc
56 _require_command "$KILLALL_PROG" killall
58 echo "Silence is golden."
60 sdev=$(_short_dev $SCRATCH_DEV)
63 _scratch_mkfs_sized $((1024 * 1024 * 500)) >> $seqres.full 2>&1 ||
67 # populate the fs with some data and cycle the mount to reset the log head/tail
68 $FSSTRESS_PROG -d $SCRATCH_MNT -z -fcreat=1 -p 4 -n 100000 > /dev/null 2>&1
69 _scratch_cycle_mount || _fail "cycle mount failed"
71 # Pin the tail and start a file removal workload. File removal tends to
72 # reproduce the corruption more reliably.
73 _scratch_inject_error log_item_pin 1
75 rm -rf $SCRATCH_MNT/* > /dev/null 2>&1 &
78 # wait for the head to stop pushing forward
80 head=`cat /sys/fs/xfs/$sdev/log/log_head_lsn`
81 while [ "$head" != "$prevhead" ]; do
84 head=`cat /sys/fs/xfs/$sdev/log/log_head_lsn`
87 # Once the head is pinned behind the tail, enable log record corruption and
88 # unpin the tail. All subsequent log buffer writes end up corrupted on-disk and
89 # result in log I/O errors.
90 _scratch_inject_error log_bad_crc 1
91 _scratch_inject_error log_item_pin 0
93 # wait for fs shutdown to kill the workload
96 # cycle mount to test log recovery