| #! /bin/bash |
| # FS QA Test 158 |
| # |
| # The test case is check if scrub is able fix raid6 data corruption, |
| # ie. if there is data corruption on two disks in the same horizontal |
| # stripe, e.g. due to bitrot. |
| # |
| # The kernel fixes are |
| # Btrfs: make raid6 rebuild retry more |
| # Btrfs: fix scrub to repair raid6 corruption |
| # |
| #----------------------------------------------------------------------- |
| # Copyright (c) 2017 Oracle. All Rights Reserved. |
| # |
| # This program is free software; you can redistribute it and/or |
| # modify it under the terms of the GNU General Public License as |
| # published by the Free Software Foundation. |
| # |
| # This program is distributed in the hope that it would be useful, |
| # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| # GNU General Public License for more details. |
| # |
| # You should have received a copy of the GNU General Public License |
| # along with this program; if not, write the Free Software Foundation, |
| # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| #----------------------------------------------------------------------- |
| # |
| |
| 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 -f $tmp.* |
| } |
| |
| # get standard environment, filters and checks |
| . ./common/rc |
| . ./common/filter |
| |
| # remove previous $seqres.full before test |
| rm -f $seqres.full |
| |
| # real QA test starts here |
| |
| # Modify as appropriate. |
| _supported_fs btrfs |
| _supported_os Linux |
| _require_scratch_dev_pool 4 |
| _require_btrfs_command inspect-internal dump-tree |
| |
| get_physical_stripe0() |
| { |
| $BTRFS_UTIL_PROG inspect-internal dump-tree -t 3 $SCRATCH_DEV | \ |
| grep " DATA\|RAID6" -A 10 | \ |
| $AWK_PROG '($1 ~ /stripe/ && $3 ~ /devid/ && $2 ~ /0/) { print $6 }' |
| } |
| |
| get_physical_stripe1() |
| { |
| $BTRFS_UTIL_PROG inspect-internal dump-tree -t 3 $SCRATCH_DEV | \ |
| grep " DATA\|RAID6" -A 10 | \ |
| $AWK_PROG '($1 ~ /stripe/ && $3 ~ /devid/ && $2 ~ /1/) { print $6 }' |
| } |
| |
| _scratch_dev_pool_get 4 |
| # step 1: create a raid6 btrfs and create a 4K file |
| echo "step 1......mkfs.btrfs" >>$seqres.full |
| |
| mkfs_opts="-d raid6 -b 1G" |
| _scratch_pool_mkfs $mkfs_opts >>$seqres.full 2>&1 |
| |
| # -o nospace_cache makes sure data is written to the start position of the data |
| # chunk |
| _scratch_mount -o nospace_cache |
| |
| # [0,64K) is written to stripe 0 and [64K, 128K) is written to stripe 1 |
| $XFS_IO_PROG -f -d -c "pwrite -S 0xaa 0 128K" -c "fsync" \ |
| "$SCRATCH_MNT/foobar" | _filter_xfs_io |
| |
| _scratch_unmount |
| |
| stripe_0=`get_physical_stripe0` |
| stripe_1=`get_physical_stripe1` |
| dev4=`echo $SCRATCH_DEV_POOL | awk '{print $4}'` |
| dev3=`echo $SCRATCH_DEV_POOL | awk '{print $3}'` |
| |
| # step 2: corrupt the 1st and 2nd stripe (stripe 0 and 1) |
| echo "step 2......simulate bitrot at offset $stripe_0 of device_4($dev4) and offset $stripe_1 of device_3($dev3)" >>$seqres.full |
| |
| $XFS_IO_PROG -f -d -c "pwrite -S 0xbb $stripe_0 64K" $dev4 | _filter_xfs_io |
| $XFS_IO_PROG -f -d -c "pwrite -S 0xbb $stripe_1 64K" $dev3 | _filter_xfs_io |
| |
| # step 3: scrub filesystem to repair the bitrot |
| echo "step 3......repair the bitrot" >> $seqres.full |
| _scratch_mount -o nospace_cache |
| |
| $BTRFS_UTIL_PROG scrub start -B $SCRATCH_MNT >> $seqres.full 2>&1 |
| |
| od -x $SCRATCH_MNT/foobar |
| |
| _scratch_dev_pool_put |
| |
| # success, all done |
| status=0 |
| exit |