2 # SPDX-License-Identifier: GPL-2.0
3 # Copyright (c) 2017 Oracle. All Rights Reserved.
7 # The test case is check if scrub is able fix raid6 data corruption,
8 # ie. if there is data corruption on two disks in the same horizontal
9 # stripe, e.g. due to bitrot.
11 # The kernel fixes are
12 # Btrfs: make raid6 rebuild retry more
13 # Btrfs: fix scrub to repair raid6 corruption
16 seqres=$RESULT_DIR/$seq
17 echo "QA output created by $seq"
21 status=1 # failure is the default!
22 trap "_cleanup; exit \$status" 0 1 2 3 15
30 # get standard environment, filters and checks
34 # remove previous $seqres.full before test
37 # real QA test starts here
39 # Modify as appropriate.
41 _require_scratch_dev_pool 4
42 _require_btrfs_command inspect-internal dump-tree
43 _require_btrfs_fs_feature raid56
48 $BTRFS_UTIL_PROG inspect-internal dump-tree -t 3 $SCRATCH_DEV | \
49 grep " DATA\|RAID6" -A 10 | \
50 $AWK_PROG "(\$1 ~ /stripe/ && \$3 ~ /devid/ && \$2 ~ /$stripe/) { print \$6 }"
56 $BTRFS_UTIL_PROG inspect-internal dump-tree -t 3 $SCRATCH_DEV | \
57 grep " DATA\|RAID6" -A 10 | \
58 $AWK_PROG "(\$1 ~ /stripe/ && \$3 ~ /devid/ && \$2 ~ /$stripe/) { print \$4 }"
64 echo "$SCRATCH_DEV_POOL" | $AWK_PROG "{print \$$devid}"
67 _scratch_dev_pool_get 4
68 # step 1: create a raid6 btrfs and create a 128K file
69 echo "step 1......mkfs.btrfs" >>$seqres.full
71 mkfs_opts="-d raid6 -b 1G"
72 _scratch_pool_mkfs $mkfs_opts >>$seqres.full 2>&1
74 # -o nospace_cache makes sure data is written to the start position of the data
76 _scratch_mount -o nospace_cache
78 # [0,64K) is written to stripe 0 and [64K, 128K) is written to stripe 1
79 $XFS_IO_PROG -f -d -c "pwrite -S 0xaa 0 128K" -c "fsync" \
80 "$SCRATCH_MNT/foobar" | _filter_xfs_io
84 phy0=$(get_physical 0)
86 devpath0=$(get_device_path $devid0)
87 phy1=$(get_physical 1)
89 devpath1=$(get_device_path $devid1)
91 # step 2: corrupt the 1st and 2nd stripe (stripe 0 and 1)
92 echo "step 2......simulate bitrot at:" >>$seqres.full
93 echo " ......stripe #0: devid $devid0 devpath $devpath0 phy $phy0" \
95 echo " ......stripe #1: devid $devid1 devpath $devpath1 phy $phy1" \
98 $XFS_IO_PROG -f -d -c "pwrite -S 0xbb $phy0 64K" $devpath0 > /dev/null
99 $XFS_IO_PROG -f -d -c "pwrite -S 0xbb $phy1 64K" $devpath1 > /dev/null
101 # step 3: scrub filesystem to repair the bitrot
102 echo "step 3......repair the bitrot" >> $seqres.full
103 _scratch_mount -o nospace_cache
105 $BTRFS_UTIL_PROG scrub start -B $SCRATCH_MNT >> $seqres.full 2>&1
107 od -x $SCRATCH_MNT/foobar
109 _scratch_dev_pool_put