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btrfs: reproduce a read failure on raid6 setup
This test case is to reproduce a bug of raid6 reconstruction process. The kernel fix are Btrfs: do not merge rbios if their fail stripe index are not identical Btrfs: make raid6 rebuild retry more [eguan: whitespace and indention fix, add 'raid' group] Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Reviewed-by: Eryu Guan <eguan@redhat.com> Signed-off-by: Eryu Guan <eguan@redhat.com>
This commit is contained in:
Liu Bo
Eryu Guan
Executable
+121
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#! /bin/bash
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# FS QA Test 157
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#
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# The test case is to reproduce a bug in raid6 reconstruction process that
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# would end up with read failure if there is data corruption on two disks in
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# the same horizontal stripe, e.g. due to bitrot.
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#
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# The bug happens when
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# a) all disks are good to read,
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# b) there is corrupted data on two disks in the same horizontal stripe due to
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# something like bitrot,
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# c) when rebuilding data after crc fails, btrfs is not able to tell whether
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# other copies are good or corrupted because btrfs doesn't have crc for
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# unallocated blocks.
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#
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# The kernel fixes are
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# Btrfs: do not merge rbios if their fail stripe index are not identical
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# Btrfs: make raid6 rebuild retry more
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#
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#-----------------------------------------------------------------------
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# Copyright (c) 2017 Oracle. All Rights Reserved.
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it would be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write the Free Software Foundation,
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# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#-----------------------------------------------------------------------
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#
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seq=`basename $0`
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seqres=$RESULT_DIR/$seq
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echo "QA output created by $seq"
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here=`pwd`
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tmp=/tmp/$$
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status=1 # failure is the default!
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trap "_cleanup; exit \$status" 0 1 2 3 15
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_cleanup()
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{
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cd /
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rm -f $tmp.*
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}
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# get standard environment, filters and checks
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. ./common/rc
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. ./common/filter
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# remove previous $seqres.full before test
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rm -f $seqres.full
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# real QA test starts here
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# Modify as appropriate.
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_supported_fs btrfs
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_supported_os Linux
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_require_scratch_dev_pool 4
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_require_btrfs_command inspect-internal dump-tree
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get_physical_stripe0()
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{
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$BTRFS_UTIL_PROG inspect-internal dump-tree -t 3 $SCRATCH_DEV | \
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grep " DATA\|RAID6" -A 10 | \
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$AWK_PROG '($1 ~ /stripe/ && $3 ~ /devid/ && $2 ~ /0/) { print $6 }'
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}
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get_physical_stripe1()
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{
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$BTRFS_UTIL_PROG inspect-internal dump-tree -t 3 $SCRATCH_DEV | \
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grep " DATA\|RAID6" -A 10 | \
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$AWK_PROG '($1 ~ /stripe/ && $3 ~ /devid/ && $2 ~ /1/) { print $6 }'
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}
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_scratch_dev_pool_get 4
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# step 1: create a raid6 btrfs and create a 4K file
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echo "step 1......mkfs.btrfs" >>$seqres.full
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mkfs_opts="-d raid6 -b 1G"
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_scratch_pool_mkfs $mkfs_opts >>$seqres.full 2>&1
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# -o nospace_cache makes sure data is written to the start position of the data
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# chunk
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_scratch_mount -o nospace_cache
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# [0,64K) is written to stripe 0 and [64K, 128K) is written to stripe 1
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$XFS_IO_PROG -f -d -c "pwrite -S 0xaa 0 128K" -c "fsync" \
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"$SCRATCH_MNT/foobar" | _filter_xfs_io
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_scratch_unmount
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stripe_0=`get_physical_stripe0`
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stripe_1=`get_physical_stripe1`
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dev4=`echo $SCRATCH_DEV_POOL | awk '{print $4}'`
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dev3=`echo $SCRATCH_DEV_POOL | awk '{print $3}'`
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# step 2: corrupt the 1st and 2nd stripe (stripe 0 and 1)
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echo "step 2......simulate bitrot at offset $stripe_0 of device_4($dev4) and offset $stripe_1 of device_3($dev3)" >>$seqres.full
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$XFS_IO_PROG -f -d -c "pwrite -S 0xbb $stripe_0 64K" $dev4 | _filter_xfs_io
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$XFS_IO_PROG -f -d -c "pwrite -S 0xbb $stripe_1 64K" $dev3 | _filter_xfs_io
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# step 3: read foobar to repair the bitrot
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echo "step 3......repair the bitrot" >> $seqres.full
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_scratch_mount -o nospace_cache
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# read the 2nd stripe, i.e. [64K, 128K), to trigger repair
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od -x -j 64K $SCRATCH_MNT/foobar
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_scratch_dev_pool_put
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# success, all done
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status=0
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exit
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@@ -0,0 +1,10 @@
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QA output created by 157
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wrote 131072/131072 bytes at offset 0
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XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 65536/65536 bytes at offset 9437184
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XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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wrote 65536/65536 bytes at offset 9437184
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XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
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0200000 aaaa aaaa aaaa aaaa aaaa aaaa aaaa aaaa
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*
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0400000
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@@ -159,3 +159,4 @@
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154 auto quick
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155 auto quick send
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156 auto quick trim
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157 auto quick raid
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