4 # Regression test for btrfs DIO read's repair during read without checksum.
6 # Commit 2dabb3248453 ("Btrfs: Direct I/O read: Work on sectorsized blocks")
7 # introduced this regression. It'd cause 'Segmentation fault' error.
10 # commit 97bf5a5589aa ("Btrfs: fix segmentation fault when doing dio read")
12 #-----------------------------------------------------------------------
13 # Copyright (c) 2017 Liu Bo. All Rights Reserved.
15 # This program is free software; you can redistribute it and/or
16 # modify it under the terms of the GNU General Public License as
17 # published by the Free Software Foundation.
19 # This program is distributed in the hope that it would be useful,
20 # but WITHOUT ANY WARRANTY; without even the implied warranty of
21 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 # GNU General Public License for more details.
24 # You should have received a copy of the GNU General Public License
25 # along with this program; if not, write the Free Software Foundation,
26 # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
27 #-----------------------------------------------------------------------
31 seqres=$RESULT_DIR/$seq
32 echo "QA output created by $seq"
36 status=1 # failure is the default!
37 trap "_cleanup; exit \$status" 0 1 2 3 15
45 # get standard environment, filters and checks
49 # remove previous $seqres.full before test
52 # real QA test starts here
54 # Modify as appropriate.
57 _require_fail_make_request
58 _require_scratch_dev_pool 2
60 _require_btrfs_command inspect-internal dump-tree
61 _require_command "$FILEFRAG_PROG" filefrag
65 # $1 is logical address
66 # print chunk tree and find devid 2 which is $SCRATCH_DEV
67 $BTRFS_UTIL_PROG inspect-internal dump-tree -t 3 $SCRATCH_DEV | \
68 grep $1 -A 6 | awk '($1 ~ /stripe/ && $3 ~ /devid/ && $4 ~ /1/) { print $6 }'
72 SYSFS_BDEV=`_sysfs_dev $SCRATCH_DEV`
76 echo 100 > $DEBUGFS_MNT/fail_make_request/probability
77 echo 2 > $DEBUGFS_MNT/fail_make_request/times
78 echo 1 > $DEBUGFS_MNT/fail_make_request/task-filter
79 echo 0 > $DEBUGFS_MNT/fail_make_request/verbose
80 echo 1 > $SYSFS_BDEV/make-it-fail
85 echo 0 > $DEBUGFS_MNT/fail_make_request/probability
86 echo 0 > $DEBUGFS_MNT/fail_make_request/times
87 echo 0 > $DEBUGFS_MNT/fail_make_request/task-filter
88 echo 0 > $SYSFS_BDEV/make-it-fail
91 _scratch_dev_pool_get 2
92 # step 1, create a raid1 btrfs which contains one 128k file.
93 echo "step 1......mkfs.btrfs" >>$seqres.full
95 mkfs_opts="-d raid1 -b 1G"
96 _scratch_pool_mkfs $mkfs_opts >>$seqres.full 2>&1
98 # -o nospace_cache makes sure data is written to the start position of the data
100 _scratch_mount -o nospace_cache,nodatasum
102 $XFS_IO_PROG -f -d -c "pwrite -S 0xaa -b 128K 0 128K" "$SCRATCH_MNT/foobar" |\
103 _filter_xfs_io_offset
105 # step 2, corrupt the first 64k of one copy (on SCRATCH_DEV which is the first
106 # one in $SCRATCH_DEV_POOL
107 echo "step 2......corrupt file extent" >>$seqres.full
109 ${FILEFRAG_PROG} -v $SCRATCH_MNT/foobar >> $seqres.full
110 logical_in_btrfs=`${FILEFRAG_PROG} -v $SCRATCH_MNT/foobar | _filter_filefrag | cut -d '#' -f 1`
111 physical_on_scratch=`get_physical ${logical_in_btrfs}`
114 $XFS_IO_PROG -d -c "pwrite -S 0xbb -b 64K $physical_on_scratch 64K" $SCRATCH_DEV |\
115 _filter_xfs_io_offset
117 _scratch_mount -o nospace_cache
119 # step 3, 128k dio read (this read can repair bad copy)
120 echo "step 3......repair the bad copy" >>$seqres.full
122 # since raid1 consists of two copies, and the bad copy was put on stripe #1
123 # while the good copy lies on stripe #0, the bad copy only gets access when the
124 # reader's pid % 2 == 1 is true
126 while [[ -z ${result} ]]; do
127 # enable task-filter only fails the following dio read so the repair is
130 if [[ \$((\$\$ % 2)) -eq 1 ]]; then
131 echo 1 > /proc/\$\$/make-it-fail
132 exec $XFS_IO_PROG -d -c \"pread -b 128K 0 128K\" \"$SCRATCH_MNT/foobar\"
139 # check if the repair works
140 $XFS_IO_PROG -c "pread -v -b 512 $physical_on_scratch 512" $SCRATCH_DEV |\
141 _filter_xfs_io_offset
143 _scratch_dev_pool_put