On Wed, Jul 05, 2017 at 08:16:11AM -0400, Brian Foster wrote:
> 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).
I was entertaining the thought of making all the debugging knobs
available through a single helper function, though I concede that these
two affect all of XFS and are thus a little weird.
Perhaps a second helper function for module-wide knobs?
>
> > + # 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.
Ok.
>
> 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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