#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+# Copyright (c) 2017 Liu Bo. All Rights Reserved.
+#
# FS QA Test 142
#
# Regression test for btrfs DIO read's repair during read without checksum.
# The upstream fix is
# commit 97bf5a5589aa ("Btrfs: fix segmentation fault when doing dio read")
#
-#-----------------------------------------------------------------------
-# Copyright (c) 2017 Liu Bo. All Rights Reserved.
-#
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License as
-# published by the Free Software Foundation.
-#
-# This program is distributed in the hope that it would be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write the Free Software Foundation,
-# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-#-----------------------------------------------------------------------
-#
-
seq=`basename $0`
seqres=$RESULT_DIR/$seq
echo "QA output created by $seq"
# get standard environment, filters and checks
. ./common/rc
. ./common/filter
+. ./common/dmdust
# remove previous $seqres.full before test
rm -f $seqres.full
# Modify as appropriate.
_supported_fs btrfs
_supported_os Linux
-_require_fail_make_request
_require_scratch_dev_pool 2
+_require_dm_target dust
_require_btrfs_command inspect-internal dump-tree
_require_command "$FILEFRAG_PROG" filefrag
-get_physical()
-{
- # $1 is logical address
- # print chunk tree and find devid 2 which is $SCRATCH_DEV
- $BTRFS_UTIL_PROG inspect-internal dump-tree -t 3 $SCRATCH_DEV | \
- grep $1 -A 6 | awk '($1 ~ /stripe/ && $3 ~ /devid/ && $4 ~ /1/) { print $6 }'
-}
-
-
-SYSFS_BDEV=`_sysfs_dev $SCRATCH_DEV`
-
-start_fail()
-{
- echo 100 > $DEBUGFS_MNT/fail_make_request/probability
- echo 2 > $DEBUGFS_MNT/fail_make_request/times
- echo 1 > $DEBUGFS_MNT/fail_make_request/task-filter
- echo 0 > $DEBUGFS_MNT/fail_make_request/verbose
- echo 1 > $SYSFS_BDEV/make-it-fail
-}
-
-stop_fail()
-{
- echo 0 > $DEBUGFS_MNT/fail_make_request/probability
- echo 0 > $DEBUGFS_MNT/fail_make_request/times
- echo 0 > $DEBUGFS_MNT/fail_make_request/task-filter
- echo 0 > $SYSFS_BDEV/make-it-fail
-}
-
_scratch_dev_pool_get 2
# step 1, create a raid1 btrfs which contains one 128k file.
echo "step 1......mkfs.btrfs" >>$seqres.full
$XFS_IO_PROG -f -d -c "pwrite -S 0xaa -b 128K 0 128K" "$SCRATCH_MNT/foobar" |\
_filter_xfs_io_offset
-# step 2, corrupt the first 64k of one copy (on SCRATCH_DEV which is the first
-# one in $SCRATCH_DEV_POOL
+# step 2, corrupt the first 64k of stripe #1
echo "step 2......corrupt file extent" >>$seqres.full
${FILEFRAG_PROG} -v $SCRATCH_MNT/foobar >> $seqres.full
logical_in_btrfs=`${FILEFRAG_PROG} -v $SCRATCH_MNT/foobar | _filter_filefrag | cut -d '#' -f 1`
-physical_on_scratch=`get_physical ${logical_in_btrfs}`
-
+echo "Logical offset is $logical_in_btrfs" >>$seqres.full
_scratch_unmount
-$XFS_IO_PROG -d -c "pwrite -S 0xbb -b 64K $physical_on_scratch 64K" $SCRATCH_DEV |\
- _filter_xfs_io_offset
-_scratch_mount -o nospace_cache
+read -r stripe physical < <(
+$BTRFS_UTIL_PROG inspect-internal dump-tree -t 3 "$SCRATCH_DEV" |
+ grep "$logical_in_btrfs" -A 6 |
+ $AWK_PROG '$1 == "stripe" && $3 == "devid" && $4 == 1 { print $2 " " $6; exit }')
+echo "Physical offset of stripe $stripe is $physical on devid 1" >> $seqres.full
+
+$XFS_IO_PROG -d -c "pwrite -S 0xbb -b 64K $physical 64K" "$SCRATCH_DEV" > /dev/null
+
+_init_dust
+_mount_dust
# step 3, 128k dio read (this read can repair bad copy)
echo "step 3......repair the bad copy" >>$seqres.full
-# since raid1 consists of two copies, and the bad copy was put on stripe #1
-# while the good copy lies on stripe #0, the bad copy only gets access when the
-# reader's pid % 2 == 1 is true
-start_fail
-while [[ -z ${result} ]]; do
- # enable task-filter only fails the following dio read so the repair is
- # supposed to work.
- result=$(bash -c "
- if [[ \$((\$\$ % 2)) -eq 1 ]]; then
- echo 1 > /proc/\$\$/make-it-fail
- exec $XFS_IO_PROG -d -c \"pread -b 128K 0 128K\" \"$SCRATCH_MNT/foobar\"
- fi");
+$DMSETUP_PROG message dust-test 0 addbadblock $((physical / 512))
+$DMSETUP_PROG message dust-test 0 enable
+while [[ -z $( (( BASHPID % 2 == stripe )) &&
+ exec $XFS_IO_PROG -d -c "pread -b 128K 0 128K" "$SCRATCH_MNT/foobar") ]]; do
+ :
done
-stop_fail
-_scratch_unmount
+_cleanup_dust
# check if the repair works
-$XFS_IO_PROG -c "pread -v -b 512 $physical_on_scratch 512" $SCRATCH_DEV |\
+$XFS_IO_PROG -c "pread -v -b 512 $physical 512" "$SCRATCH_DEV" |
_filter_xfs_io_offset
_scratch_dev_pool_put