On Fri, Jul 21, 2017 at 03:04:45PM -0700, Darrick J. Wong wrote:
> From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
>
> Refactor the XFS error injection helpers to use the new errortag
> interface to configure error injection. If that isn't present, fall
> back either to the xfs_io/ioctl based injection or the older sysfs
> knobs. Refactor existing testcases to use the new helpers.
>
> Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
This looks good to me overall, but I still perfer let other people
who're more familar with XFS errortag and error injection to review too.
While I do have some questions/comments :)
> ---
> common/inject | 58 +++++++++++++++++++++++++++++++++++++++++++++++++++++++--
> tests/xfs/141 | 5 +++--
> tests/xfs/196 | 17 ++++++-----------
> 3 files changed, 65 insertions(+), 15 deletions(-)
>
>
> diff --git a/common/inject b/common/inject
> index 8ecc290..9aa24de 100644
> --- a/common/inject
> +++ b/common/inject
> @@ -35,10 +35,46 @@ _require_error_injection()
> esac
> }
>
> +# Find a given xfs mount's errortag injection knob in sysfs
> +_find_xfs_mount_errortag_knob()
While The function name and comment both indicate it needs a mounted
XFS, it seems weird that the first argument is expected to be a block
device. And do we need to check if the given device is really mounted?
> +{
> + 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="$1"
> +
> + # Can we find the error injection knobs via the new errortag
> + # configuration mechanism?
> + test -w "$(_find_xfs_mount_errortag_knob "${TEST_DEV}" "${type}")" && return
> +
As this check goes prior to the _require_error_injection check, so I
assume this new errortag framework doesn't depend on a debug built XFS,
can I?
> _require_error_injection
>
> # NOTE: We can't actually test error injection here because xfs
> @@ -54,16 +90,34 @@ _require_xfs_io_error_injection()
> _test_inject_error()
> {
> type="$1"
> + value="$2"
>
> - $XFS_IO_PROG -x -c "inject $type" $TEST_DIR
> + knob="$(_find_xfs_mount_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
> + _notrun "Cannot inject error ${type} value ${value}."
_require_xfs_io_error_injection already made sure we can do error
jection, it looks like a bug somewhere to me if we can't inject error
here, either wanted to inject error without checking the support status
first or an implementation bug in the error injection framework in
xfstests. So "_fail" might be the right choice.
> + fi
> }
>
> # Inject an error into the scratch fs
> _scratch_inject_error()
> {
> type="$1"
> + value="$2"
>
> - $XFS_IO_PROG -x -c "inject $type" $SCRATCH_MNT
> + knob="$(_find_xfs_mount_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
> + _notrun "Cannot inject error ${type} value ${value}."
Same here.
Thanks,
Eryu
> + fi
> }
>
> # Unmount and remount the scratch device, dumping the log
> diff --git a/tests/xfs/141 b/tests/xfs/141
> index 56ff14e..f61e524 100755
> --- a/tests/xfs/141
> +++ b/tests/xfs/141
> @@ -47,13 +47,14 @@ rm -f $seqres.full
>
> # get standard environment, filters and checks
> . ./common/rc
> +. ./common/inject
>
> # real QA test starts here
>
> # Modify as appropriate.
> _supported_fs xfs
> _supported_os Linux
> -_require_xfs_sysfs $(_short_dev $TEST_DEV)/log/log_badcrc_factor
> +_require_xfs_io_error_injection "log_bad_crc"
> _require_scratch
> _require_command "$KILLALL_PROG" killall
>
> @@ -69,7 +70,7 @@ for i in $(seq 1 5); do
> # (increase this value to run fsstress longer).
> factor=$((RANDOM % 100 + 1))
> echo iteration $i log_badcrc_factor: $factor >> $seqres.full 2>&1
> - echo $factor > /sys/fs/xfs/$sdev/log/log_badcrc_factor
> + _scratch_inject_error "log_bad_crc" "$factor"
>
> # Run fsstress until the filesystem shuts down. It will shut down
> # automatically when error injection triggers.
> diff --git a/tests/xfs/196 b/tests/xfs/196
> index e9b0649..fe3f570 100755
> --- a/tests/xfs/196
> +++ b/tests/xfs/196
> @@ -45,6 +45,7 @@ _cleanup()
> # get standard environment, filters and checks
> . ./common/rc
> . ./common/punch
> +. ./common/inject
>
> # real QA test starts here
> rm -f $seqres.full
> @@ -53,13 +54,7 @@ rm -f $seqres.full
> _supported_fs generic
> _supported_os Linux
> _require_scratch
> -
> -DROP_WRITES="drop_writes"
> -# replace "drop_writes" with "fail_writes" for old kernel
> -if [ -f /sys/fs/xfs/$(_short_dev $TEST_DEV)/fail_writes ];then
> - DROP_WRITES="fail_writes"
> -fi
> -_require_xfs_sysfs $(_short_dev $TEST_DEV)/${DROP_WRITES}
> +_require_xfs_io_error_injection "drop_writes"
>
> _scratch_mkfs >/dev/null 2>&1
> _scratch_mount
> @@ -72,7 +67,7 @@ bytes=$((64 * 1024))
> $XFS_IO_PROG -f -c "pwrite 0 $bytes" $file >> $seqres.full 2>&1
>
> # Enable write drops. All buffered writes are dropped from this point on.
> -echo 1 > /sys/fs/xfs/$sdev/$DROP_WRITES
> +_scratch_inject_error "drop_writes" 1
>
> # Write every other 4k range to split the larger delalloc extent into many more
> # smaller extents. Use pwrite because with write failures enabled, all
> @@ -89,7 +84,7 @@ for i in $(seq 4096 8192 $endoff); do
> $XFS_IO_PROG -c "pwrite $i 4k" $file >> $seqres.full 2>&1
> done
>
> -echo 0 > /sys/fs/xfs/$sdev/$DROP_WRITES
> +_scratch_inject_error "drop_writes" 0
>
> _scratch_cycle_mount
> $XFS_IO_PROG -c 'bmap -vp' $file | _filter_bmap
> @@ -104,9 +99,9 @@ for offset in $(seq 0 100 500); do
> $XFS_IO_PROG -fc "pwrite ${offset}m 100m" $file >> $seqres.full 2>&1
>
> punchoffset=$((offset + 75))
> - echo 1 > /sys/fs/xfs/$sdev/$DROP_WRITES
> + _scratch_inject_error "drop_writes"
> $XFS_IO_PROG -c "pwrite ${punchoffset}m 4k" $file >> $seqres.full 2>&1
> - echo 0 > /sys/fs/xfs/$sdev/$DROP_WRITES
> + _scratch_inject_error "drop_writes" 0
> done
>
> echo "Silence is golden."
>
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