2 # SPDX-License-Identifier: GPL-2.0
3 # Copyright (c) 2017 Liu Bo. All Rights Reserved.
7 # Regression test for btrfs DIO read's repair during read without checksum.
9 # Commit 2dabb3248453 ("Btrfs: Direct I/O read: Work on sectorsized blocks")
10 # introduced this regression. It'd cause 'Segmentation fault' error.
13 # commit 97bf5a5589aa ("Btrfs: fix segmentation fault when doing dio read")
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 $seqres.full before test
37 # real QA test starts here
39 # Modify as appropriate.
42 _require_fail_make_request
43 _require_scratch_dev_pool 2
45 _require_btrfs_command inspect-internal dump-tree
46 _require_command "$FILEFRAG_PROG" filefrag
52 $BTRFS_UTIL_PROG inspect-internal dump-tree -t 3 $SCRATCH_DEV | \
53 grep $logical -A 6 | \
54 $AWK_PROG "(\$1 ~ /stripe/ && \$3 ~ /devid/ && \$2 ~ /$stripe/) { print \$6 }"
61 $BTRFS_UTIL_PROG inspect-internal dump-tree -t 3 $SCRATCH_DEV | \
62 grep $logical -A 6 | \
63 $AWK_PROG "(\$1 ~ /stripe/ && \$3 ~ /devid/ && \$2 ~ /$stripe/) { print \$4 }"
69 echo "$SCRATCH_DEV_POOL" | $AWK_PROG "{print \$$devid}"
75 echo 100 > $DEBUGFS_MNT/fail_make_request/probability
76 echo 2 > $DEBUGFS_MNT/fail_make_request/times
77 echo 1 > $DEBUGFS_MNT/fail_make_request/task-filter
78 echo 0 > $DEBUGFS_MNT/fail_make_request/verbose
79 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 stripe #1
106 echo "step 2......corrupt file extent" >>$seqres.full
108 ${FILEFRAG_PROG} -v $SCRATCH_MNT/foobar >> $seqres.full
109 logical_in_btrfs=`${FILEFRAG_PROG} -v $SCRATCH_MNT/foobar | _filter_filefrag | cut -d '#' -f 1`
110 physical=`get_physical ${logical_in_btrfs} 1`
111 devid=$(get_devid ${logical_in_btrfs} 1)
112 target_dev=$(get_device_path $devid)
114 SYSFS_BDEV=`_sysfs_dev $target_dev`
117 $BTRFS_UTIL_PROG ins dump-tree -t 3 $SCRATCH_DEV | \
118 grep $logical_in_btrfs -A 6 >> $seqres.full
119 echo "Corrupt stripe 1 devid $devid devpath $target_dev physical $physical" \
121 $XFS_IO_PROG -d -c "pwrite -S 0xbb -b 64K $physical 64K" $target_dev > /dev/null
123 _scratch_mount -o nospace_cache
125 # step 3, 128k dio read (this read can repair bad copy)
126 echo "step 3......repair the bad copy" >>$seqres.full
128 # since raid1 consists of two copies, and the bad copy was put on stripe #1
129 # while the good copy lies on stripe #0, the bad copy only gets access when the
130 start_fail $SYSFS_BDEV
131 while [[ -z ${result} ]]; do
132 # enable task-filter only fails the following dio read so the repair is
135 if [[ \$((\$\$ % 2)) -eq 1 ]]; then
136 echo 1 > /proc/\$\$/make-it-fail
137 exec $XFS_IO_PROG -d -c \"pread -b 128K 0 128K\" \"$SCRATCH_MNT/foobar\"
140 stop_fail $SYSFS_BDEV
144 # check if the repair works
145 $XFS_IO_PROG -c "pread -v -b 512 $physical 512" $target_dev | \
146 _filter_xfs_io_offset
148 _scratch_dev_pool_put