4 # Regression test for btrfs buffered read's repair during read.
6 # Commit 20a7db8ab3f2 ("btrfs: add dummy callback for readpage_io_failed
7 # and drop checks") introduced the regression.
10 # Commit 9d0d1c8b1c9d ("Btrfs: bring back repair during 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 $seqres.full before test
52 # real QA test starts here
54 # Modify as appropriate.
57 _require_scratch_dev_pool 2
59 _require_btrfs_command inspect-internal dump-tree
60 _require_command "$FILEFRAG_PROG" filefrag
64 # $1 is logical address
65 # print chunk tree and find devid 2 which is $SCRATCH_DEV
66 $BTRFS_UTIL_PROG inspect-internal dump-tree -t 3 $SCRATCH_DEV | \
67 grep $1 -A 6 | awk '($1 ~ /stripe/ && $3 ~ /devid/ && $4 ~ /1/) { print $6 }'
70 _scratch_dev_pool_get 2
71 # step 1, create a raid1 btrfs which contains one 128k file.
72 echo "step 1......mkfs.btrfs" >>$seqres.full
74 mkfs_opts="-d raid1 -b 1G"
75 _scratch_pool_mkfs $mkfs_opts >>$seqres.full 2>&1
77 # -o nospace_cache makes sure data is written to the start position of the data
79 _scratch_mount -o nospace_cache
81 $XFS_IO_PROG -f -d -c "pwrite -S 0xaa -b 128K 0 128K" "$SCRATCH_MNT/foobar" | _filter_xfs_io
83 # step 2, corrupt the first 64k of one copy (on SCRATCH_DEV which is the first
84 # one in $SCRATCH_DEV_POOL
85 echo "step 2......corrupt file extent" >>$seqres.full
87 ${FILEFRAG_PROG} -v $SCRATCH_MNT/foobar >> $seqres.full
88 logical_in_btrfs=`${FILEFRAG_PROG} -v $SCRATCH_MNT/foobar | _filter_filefrag | cut -d '#' -f 1`
89 physical_on_scratch=`get_physical ${logical_in_btrfs}`
92 $XFS_IO_PROG -d -c "pwrite -S 0xbb -b 64K $physical_on_scratch 64K" $SCRATCH_DEV | _filter_xfs_io
96 # step 3, 128k buffered read (this read can repair bad copy)
97 echo "step 3......repair the bad copy" >>$seqres.full
99 # since raid1 consists of two copies, and the bad copy was put on stripe #1
100 # while the good copy lies on stripe #0, the bad copy only gets access when the
101 # reader's pid % 2 == 1 is true
103 echo 3 > /proc/sys/vm/drop_caches
104 $XFS_IO_PROG -c "pread -b 128K 0 128K" "$SCRATCH_MNT/foobar" > /dev/null &
107 [ $((pid % 2)) == 1 ] && break
112 # check if the repair works
113 $XFS_IO_PROG -c "pread -v -b 512 $physical_on_scratch 512" $SCRATCH_DEV | _filter_xfs_io
115 _scratch_dev_pool_put