| ##/bin/bash |
| # SPDX-License-Identifier: GPL-2.0+ |
| # Copyright (c) 2016 Oracle. All Rights Reserved. |
| # |
| # Routines for injecting errors into filesystems |
| |
| . ./common/log |
| |
| # Tests whether $FSTYP is one of the filesystems that supports error injection |
| _require_error_injection() |
| { |
| case "$FSTYP" in |
| "xfs") |
| grep -q 'debug 1' /proc/fs/xfs/stat || \ |
| _notrun "XFS error injection requires CONFIG_XFS_DEBUG" |
| ;; |
| *) |
| _notrun "Error injection not supported on filesystem type: $FSTYP" |
| esac |
| } |
| |
| # Find the errortag injection knob in sysfs for a given xfs mount's |
| # block device. |
| _find_xfs_mountdev_errortag_knob() |
| { |
| dev="$1" |
| knob="$2" |
| shortdev="$(_short_dev "${dev}")" |
| tagfile="/sys/fs/xfs/${shortdev}/errortag/${knob}" |
| |
| # Some of the new sysfs errortag knobs were previously available via |
| # another sysfs path. |
| case "${knob}" in |
| "log_bad_crc") |
| if [ ! -w "${tagfile}" ]; then |
| tagfile="/sys/fs/xfs/${shortdev}/log/log_badcrc_factor" |
| fi |
| ;; |
| "drop_writes") |
| if [ ! -w "${tagfile}" ]; then |
| tagfile="/sys/fs/xfs/${shortdev}/drop_writes" |
| fi |
| if [ ! -w "${tagfile}" ]; then |
| tagfile="/sys/fs/xfs/${shortdev}/fail_writes" |
| fi |
| ;; |
| *) |
| ;; |
| esac |
| |
| echo "${tagfile}" |
| } |
| |
| # Requires that xfs_io inject command knows about this error type |
| _require_xfs_io_error_injection() |
| { |
| type="$1" |
| _require_error_injection |
| |
| # Can we find the error injection knobs via the new errortag |
| # configuration mechanism? |
| knob="$(_find_xfs_mountdev_errortag_knob "${TEST_DEV}" "${type}")" |
| test -w "${knob}" && return |
| |
| # If the directory containing the sysfs error injection knob exists |
| # but the knob itself isn't usable, this kernel doesn't know about |
| # the knob. Skip the test. |
| if [ -d "$(dirname "${knob}")" ]; then |
| _notrun "XFS error injection $type unknown on this kernel." |
| fi |
| |
| # NOTE: We can't actually test error injection here because xfs |
| # hasn't always range checked the argument to xfs_errortag_add. |
| # We also don't want to trip an error before we're ready to deal |
| # with it. |
| |
| $XFS_IO_PROG -x -c 'inject' $TEST_DIR | grep -q "$type" || \ |
| _notrun "XFS error injection $type unknown." |
| } |
| |
| # Inject an error into the test fs |
| _test_inject_error() |
| { |
| type="$1" |
| value="$2" |
| |
| knob="$(_find_xfs_mountdev_errortag_knob "${TEST_DEV}" "${type}")" |
| if [ -w "${knob}" ]; then |
| test -z "${value}" && value="default" |
| echo -n "${value}" > "${knob}" |
| elif [ -z "${value}" ] || [ "${value}" = "default" ]; then |
| $XFS_IO_PROG -x -c "inject $type" $TEST_DIR |
| else |
| _fail "Cannot inject error ${type} value ${value}." |
| fi |
| } |
| |
| # Inject an error into the scratch fs |
| _scratch_inject_error() |
| { |
| type="$1" |
| value="$2" |
| |
| knob="$(_find_xfs_mountdev_errortag_knob "${SCRATCH_DEV}" "${type}")" |
| if [ -w "${knob}" ]; then |
| test -z "${value}" && value="default" |
| echo -n "${value}" > "${knob}" |
| elif [ -z "${value}" ] || [ "${value}" = "default" ]; then |
| $XFS_IO_PROG -x -c "inject $type" $SCRATCH_MNT |
| else |
| _fail "Cannot inject error ${type} value ${value}." |
| fi |
| } |
| |
| # Unmount and remount the scratch device, dumping the log |
| _scratch_inject_logprint() |
| { |
| local opts="$1" |
| |
| if test -n "$opts"; then |
| opts="-o $opts" |
| fi |
| _scratch_unmount |
| _scratch_dump_log |
| _scratch_mount "$opts" |
| } |
| |
| # Unmount and remount the test device, dumping the log |
| _test_inject_logprint() |
| { |
| local opts="$1" |
| |
| if test -n "$opts"; then |
| opts="-o $opts" |
| fi |
| _test_unmount |
| _test_dump_log |
| _test_mount "$opts" |
| } |