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.
9 # Commit 2dabb3248453 ("Btrfs: Direct I/O read: Work on sectorsized blocks")
10 # introduced the regression.
12 # commit 2e949b0a5592 ("Btrfs: fix invalid dereference in btrfs_retry_endio")
15 seqres=$RESULT_DIR/$seq
16 echo "QA output created by $seq"
20 status=1 # failure is the default!
21 trap "_cleanup; exit \$status" 0 1 2 3 15
29 # get standard environment, filters and checks
33 # remove previous $seqres.full before test
36 # real QA test starts here
38 # Modify as appropriate.
41 _require_scratch_dev_pool 2
43 _require_btrfs_command inspect-internal dump-tree
44 _require_command "$FILEFRAG_PROG" filefrag
49 # $1 is logical address
50 # print chunk tree and find devid 2 which is $SCRATCH_DEV
51 $BTRFS_UTIL_PROG inspect-internal dump-tree -t 3 $SCRATCH_DEV | \
52 grep $1 -A 6 | awk '($1 ~ /stripe/ && $3 ~ /devid/ && $4 ~ /1/) { print $6 }'
55 _scratch_dev_pool_get 2
56 # step 1, create a raid1 btrfs which contains one 128k file.
57 echo "step 1......mkfs.btrfs" >>$seqres.full
59 mkfs_opts="-d raid1 -b 1G"
60 _scratch_pool_mkfs $mkfs_opts >>$seqres.full 2>&1
62 # -o nospace_cache makes sure data is written to the start position of the data
64 _scratch_mount -o nospace_cache
66 $XFS_IO_PROG -f -d -c "pwrite -S 0xaa -b 128K 0 128K" "$SCRATCH_MNT/foobar" |\
69 # step 2, corrupt the first 64k of one copy (on SCRATCH_DEV which is the first
70 # one in $SCRATCH_DEV_POOL
71 echo "step 2......corrupt file extent" >>$seqres.full
73 ${FILEFRAG_PROG} -v $SCRATCH_MNT/foobar >> $seqres.full
74 logical_in_btrfs=`${FILEFRAG_PROG} -v $SCRATCH_MNT/foobar | _filter_filefrag | cut -d '#' -f 1`
75 physical_on_scratch=`get_physical ${logical_in_btrfs}`
78 $XFS_IO_PROG -d -c "pwrite -S 0xbb -b 64K $physical_on_scratch 64K" $SCRATCH_DEV |\
83 # step 3, 128k dio read (this read can repair bad copy)
84 echo "step 3......repair the bad copy" >>$seqres.full
86 # since raid1 consists of two copies, and the bad copy was put on stripe #1
87 # while the good copy lies on stripe #0, the bad copy only gets access when the
88 # reader's pid % 2 == 1 is true
90 $XFS_IO_PROG -d -c "pread -b 128K 0 128K" "$SCRATCH_MNT/foobar" > /dev/null &
93 [ $((pid % 2)) == 1 ] && break
98 # check if the repair works
99 $XFS_IO_PROG -d -c "pread -v -b 512 $physical_on_scratch 512" $SCRATCH_DEV |\
100 _filter_xfs_io_offset
102 _scratch_dev_pool_put