Re: [PATCH 3/8] xfstests: stat the dev we're removing to make sure its' really gone V2

[Eric Sandeen <sandeen@redhat.com>]

On 10/18/13 1:26 PM, Josef Bacik wrote:
> I've been periodically failing btrfs/003 because my box sometimes takes a little
> longer to unregister the device when we remove it and so the output from btrfs
> dev show doesn't match what we are wanting since it still sees the device.  To
> fix this just stat and sleep if we still see the device node and only continue
> once udev or whatever actually removes the device node so that we don't get
> random failures.  Thanks,
> 
> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
> ---
> V1->V2: Take Eric's suggestion to do this in the helper function
> 
>  common/rc       | 9 +++++++++
>  tests/btrfs/003 | 2 +-
>  2 files changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/common/rc b/common/rc
> index b253948..253bd05 100644
> --- a/common/rc
> +++ b/common/rc
> @@ -2093,7 +2093,16 @@ _require_freeze()
>  # ls -l /sys/class/block/sdd | rev | cut -d "/" -f 3 | rev
>  _devmgt_remove()
>  {
> +	local h=$1

$h is never used?  You use ${1} directly below.  Is that intentional?
(Not sure if you just meant to eat $1 or if you forgot to replace it
in the echo string).

(if you respin, maybe give "$h" a more meaningful name?)

-Eric

> +	local disk=$2
> +
>  	echo 1 > /sys/class/scsi_device/${1}/device/delete || _fail "Remove disk failed"
> +
> +	stat $disk > /dev/null 2>&1
> +	while [ $? -eq 0 ]; do
> +		sleep 1
> +		stat $disk > /dev/null 2>&1
> +	done
>  }
>  
>  # arg 1 is dev to add and is output of the below eg.
> diff --git a/tests/btrfs/003 b/tests/btrfs/003
> index 262b1d5..15c2cc7 100755
> --- a/tests/btrfs/003
> +++ b/tests/btrfs/003
> @@ -142,7 +142,7 @@ _test_replace()
>  	DEVHTL=`ls -l /sys/class/block/${d} | rev | cut -d "/" -f 3 | rev`
>  
>  	#fail disk
> -	_devmgt_remove ${DEVHTL}
> +	_devmgt_remove ${DEVHTL} $ds
>  	dev_removed=1
>  
>  	$BTRFS_UTIL_PROG fi show $SCRATCH_DEV | grep "Some devices missing" >> $seqres.full || _fail \
>