On Thu, Jun 29, 2017 at 09:13:08PM -0700, Darrick J. Wong wrote:
> 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>
> ---
> common/inject | 62 +++++++++++++++++++++++++++++++++++++++++++++++++++++++--
> tests/xfs/051 | 7 ++++--
> tests/xfs/141 | 5 +++--
> tests/xfs/196 | 17 ++++++----------
> 4 files changed, 73 insertions(+), 18 deletions(-)
>
> diff --git a/common/inject b/common/inject
> index 8ecc290..1f12a2b 100644
> --- a/common/inject
> +++ b/common/inject
> @@ -35,10 +35,50 @@ _require_error_injection()
> esac
> }
>
> +# Find a given xfs mount's errortag injection knob in sysfs
> +_find_xfs_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
> + ;;
> + "log_recovery_delay"|"bug_on_assert")
What's the purpose for having these here? I'm not sure that either is
really related to error injection (which I find a little confusing
despite that this code can be reused to generically send a value to a
sysfs knob).
> + # These apply to all xfs filesystems
> + tagfile="/sys/fs/xfs/debug/${knob}"
> + ;;
> + *)
> + ;;
> + esac
> +
> + echo "${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_errortag_knob "${TEST_DEV}" "${type}")" && return
> +
> _require_error_injection
>
> # NOTE: We can't actually test error injection here because xfs
...
> diff --git a/tests/xfs/196 b/tests/xfs/196
> index e9b0649..5afc343 100755
> --- a/tests/xfs/196
> +++ b/tests/xfs/196
...
> @@ -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"
I'd prefer to keep the parameter in this case (and below) just as a
defense against future changes in the default value. Otherwise the rest
looks pretty good.
Brian
>
> # 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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