Re: [PATCH 2/2] btrfs/271: use the common fail_request setup helpers

["Darrick J. Wong" <djwong@kernel.org>]

On Tue, Aug 23, 2022 at 09:32:30PM +0200, Christoph Hellwig wrote:
> Use the helpers from common/fail_make_request instead of open coding
> them.  This switches to using a higher error count than the existing
> code, which was the intention from the very beginning (and doesn't
> actuallt matter for the short sequences in this test).
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

A pretty straightforward conversion!
Reviewed-by: Darrick J. Wong <djwong@kernel.org>

--D

> ---
>  tests/btrfs/271     | 35 ++++++++---------------------------
>  tests/btrfs/271.out |  2 ++
>  2 files changed, 10 insertions(+), 27 deletions(-)
> 
> diff --git a/tests/btrfs/271 b/tests/btrfs/271
> index 681fa965..c7c95b3e 100755
> --- a/tests/btrfs/271
> +++ b/tests/btrfs/271
> @@ -18,20 +18,6 @@ _require_fail_make_request
>  _require_scratch_dev_pool 2
>  _scratch_dev_pool_get 2
>  
> -enable_io_failure()
> -{
> -	local sysfs_bdev=`_sysfs_dev $1`
> -
> -	echo 1 > $sysfs_bdev/make-it-fail
> -}
> -
> -disable_io_failure()
> -{
> -	local sysfs_bdev=`_sysfs_dev $1`
> -
> -	echo 0 > $sysfs_bdev/make-it-fail
> -}
> -
>  _check_minimal_fs_size $(( 1024 * 1024 * 1024 ))
>  _scratch_pool_mkfs "-d raid1 -b 1G" >> $seqres.full 2>&1
>  
> @@ -43,15 +29,12 @@ pagesize=$(get_page_size)
>  blocksize=$(_get_block_size $SCRATCH_MNT)
>  sectors_per_page=$(($pagesize / $blocksize))
>  
> -# enable block I/O error injection
> -echo 100 > $DEBUGFS_MNT/fail_make_request/probability
> -echo 1000 > $DEBUGFS_MNT/fail_make_request/times
> -echo 0 > $DEBUGFS_MNT/fail_make_request/verbose
> +_allow_fail_make_request
>  
>  echo "Step 1: writing with one failing mirror:"
> -enable_io_failure $SCRATCH_DEV
> +_bdev_fail_make_request $SCRATCH_DEV 1
>  $XFS_IO_PROG -f -c "pwrite -W -S 0xaa 0 8K" $SCRATCH_MNT/foobar | _filter_xfs_io
> -disable_io_failure $SCRATCH_DEV
> +_bdev_fail_make_request $SCRATCH_DEV 0
>  
>  errs=$($BTRFS_UTIL_PROG device stats $SCRATCH_DEV | \
>  	$AWK_PROG '/write_io_errs/ { print $2 }')
> @@ -63,15 +46,13 @@ echo "Step 2: verify that the data reads back fine:"
>  $XFS_IO_PROG -c "pread -v 0 8K" $SCRATCH_MNT/foobar | _filter_xfs_io_offset
>  
>  echo "Step 3: writing with two failing mirrors (should fail):"
> -enable_io_failure $SCRATCH_DEV
> -enable_io_failure $dev2
> +_bdev_fail_make_request $SCRATCH_DEV 1
> +_bdev_fail_make_request $dev2 1
>  $XFS_IO_PROG -f -c "pwrite -W -S 0xbb 0 8K" $SCRATCH_MNT/foobar | _filter_xfs_io
> -disable_io_failure $dev2
> -disable_io_failure $SCRATCH_DEV
> +_bdev_fail_make_request $dev2 0
> +_bdev_fail_make_request $SCRATCH_DEV 0
>  
> -# disable block I/O error injection
> -echo 0 > $DEBUGFS_MNT/fail_make_request/probability
> -echo 0 > $DEBUGFS_MNT/fail_make_request/times
> +_disallow_fail_make_request
>  
>  _scratch_dev_pool_put
>  # success, all done
> diff --git a/tests/btrfs/271.out b/tests/btrfs/271.out
> index 27451c37..d58c92f2 100644
> --- a/tests/btrfs/271.out
> +++ b/tests/btrfs/271.out
> @@ -1,4 +1,5 @@
>  QA output created by 271
> +Allow global fail_make_request feature
>  Step 1: writing with one failing mirror:
>  wrote 8192/8192 bytes at offset 0
>  XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> @@ -519,3 +520,4 @@ read 8192/8192 bytes
>  XXX Bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
>  Step 3: writing with two failing mirrors (should fail):
>  fsync: Input/output error
> +Disallow global fail_make_request feature
> -- 
> 2.30.2
>