| #! /bin/bash |
| # SPDX-License-Identifier: GPL-2.0 |
| # Copyright (c) 2017 Oracle. All Rights Reserved. |
| # |
| # FS QA Test btrfs/150 |
| # |
| # This is a regression test which ends up with a kernel oops in btrfs. |
| # It occurs when btrfs's read repair happens while reading a compressed |
| # extent. |
| # The patch to fix it is |
| # Btrfs: fix kernel oops while reading compressed data |
| # |
| seq=`basename $0` |
| seqres=$RESULT_DIR/$seq |
| echo "QA output created by $seq" |
| |
| here=`pwd` |
| tmp=/tmp/$$ |
| status=1 # failure is the default! |
| trap "_cleanup; exit \$status" 0 1 2 3 15 |
| |
| _cleanup() |
| { |
| cd / |
| rm -f $tmp.* |
| } |
| |
| # get standard environment, filters and checks |
| . ./common/rc |
| . ./common/filter |
| |
| # remove previous $seqres.full before test |
| rm -f $seqres.full |
| |
| # real QA test starts here |
| |
| # Modify as appropriate. |
| _supported_fs btrfs |
| _require_scratch |
| _require_fail_make_request |
| _require_scratch_dev_pool 2 |
| _scratch_dev_pool_get 2 |
| |
| SYSFS_BDEV=`_sysfs_dev $SCRATCH_DEV` |
| enable_io_failure() |
| { |
| echo 100 > $DEBUGFS_MNT/fail_make_request/probability |
| echo 1000 > $DEBUGFS_MNT/fail_make_request/times |
| echo 0 > $DEBUGFS_MNT/fail_make_request/verbose |
| echo 1 > $DEBUGFS_MNT/fail_make_request/task-filter |
| echo 1 > $SYSFS_BDEV/make-it-fail |
| } |
| |
| disable_io_failure() |
| { |
| 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_pool_mkfs "-d raid1 -b 1G" >> $seqres.full 2>&1 |
| |
| # It doesn't matter which compression algorithm we use. |
| _scratch_mount -ocompress |
| |
| # Create a file with all data being compressed |
| $XFS_IO_PROG -f -c "pwrite -W 0 8K" $SCRATCH_MNT/foobar | _filter_xfs_io |
| |
| # Raid1 consists of two copies and btrfs decides which copy to read by reader's |
| # %pid. Now we inject errors to copy #1 and copy #0 is good. We want to read |
| # the bad copy to trigger read-repair. |
| while [[ -z $result ]]; do |
| # invalidate the page cache |
| $XFS_IO_PROG -f -c "fadvise -d 0 8K" $SCRATCH_MNT/foobar |
| |
| enable_io_failure |
| |
| result=$(bash -c " |
| if [ \$((\$\$ % 2)) == 1 ]; then |
| echo 1 > /proc/\$\$/make-it-fail |
| exec $XFS_IO_PROG -c \"pread 0 8K\" \$SCRATCH_MNT/foobar |
| fi") |
| |
| disable_io_failure |
| done |
| |
| _scratch_dev_pool_put |
| # success, all done |
| status=0 |
| exit |