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
35 # remove previous $seqres.full before test
38 # real QA test starts here
40 # Modify as appropriate.
42 _require_scratch_dev_pool 2
43 _require_dm_target dust
45 _require_btrfs_command inspect-internal dump-tree
46 _require_command "$FILEFRAG_PROG" filefrag
48 _scratch_dev_pool_get 2
49 # step 1, create a raid1 btrfs which contains one 128k file.
50 echo "step 1......mkfs.btrfs" >>$seqres.full
52 mkfs_opts="-d raid1 -b 1G"
53 _scratch_pool_mkfs $mkfs_opts >>$seqres.full 2>&1
55 # -o nospace_cache makes sure data is written to the start position of the data
57 _scratch_mount -o nospace_cache,nodatasum
59 $XFS_IO_PROG -f -d -c "pwrite -S 0xaa -b 128K 0 128K" "$SCRATCH_MNT/foobar" |\
62 # step 2, corrupt the first 64k of stripe #1
63 echo "step 2......corrupt file extent" >>$seqres.full
65 ${FILEFRAG_PROG} -v $SCRATCH_MNT/foobar >> $seqres.full
66 logical_in_btrfs=`${FILEFRAG_PROG} -v $SCRATCH_MNT/foobar | _filter_filefrag | cut -d '#' -f 1`
67 echo "Logical offset is $logical_in_btrfs" >>$seqres.full
70 read -r stripe physical < <(
71 $BTRFS_UTIL_PROG inspect-internal dump-tree -t 3 "$SCRATCH_DEV" |
72 grep "$logical_in_btrfs" -A 6 |
73 $AWK_PROG '$1 == "stripe" && $3 == "devid" && $4 == 1 { print $2 " " $6; exit }')
74 echo "Physical offset of stripe $stripe is $physical on devid 1" >> $seqres.full
76 $XFS_IO_PROG -d -c "pwrite -S 0xbb -b 64K $physical 64K" "$SCRATCH_DEV" > /dev/null
81 # step 3, 128k dio read (this read can repair bad copy)
82 echo "step 3......repair the bad copy" >>$seqres.full
84 $DMSETUP_PROG message dust-test 0 addbadblock $((physical / 512))
85 $DMSETUP_PROG message dust-test 0 enable
86 while [[ -z $( (( BASHPID % 2 == stripe )) &&
87 exec $XFS_IO_PROG -d -c "pread -b 128K 0 128K" "$SCRATCH_MNT/foobar") ]]; do
93 # check if the repair works
94 $XFS_IO_PROG -c "pread -v -b 512 $physical 512" "$SCRATCH_DEV" |