Re: [PATCH] xfstests: fix device lookup in btrfs/003

[Dave Chinner <david@fromorbit.com>]

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On Tue, Sep 03, 2013 at 06:19:01PM -0400, Jeff Mahoney wrote:
> The DEVHTL lookup in btrfs/003 is broken. It can only handle full LUNs and
> not partitions on a disk.
> 
> Rather than returning 2:0:0:0 for /dev/sdc7, it returns 'block' and we see:
> ./common/rc: line 2081: /sys/class/scsi_device/block/device/delete:
> No such file or directory
> 
> If we look up the device by dev instead of by name, we can handle working
> with full disks and partitions more easily and get the ability to use
> any device name rather than just the ones that match sysfs.
> 
> Signed-off-by: Jeff Mahoney <jeffm@suse.com>
> ---
>  tests/btrfs/003 |   18 +++++++++++++++---
>  1 file changed, 15 insertions(+), 3 deletions(-)
> 
> --- a/tests/btrfs/003
> +++ b/tests/btrfs/003
> @@ -137,9 +137,21 @@ _test_replace()
>  	#pick the 2nd last disk 
>  	ds=${devs[@]:$(($n-1)):1}
>  
> -	# retrive the HTL for this scsi disk
> -	d=`echo $ds|cut -d"/" -f3`
> -	DEVHTL=`ls -l /sys/class/block/${d} | rev | cut -d "/" -f 3 | rev`
> +	HEXMAJOR="$(stat -c "%t" "$ds")"
> +	HEXMINOR="$(stat -c "%T" "$ds")"
> +	if [ -z "$HEXMAJOR" -o -z "$HEXMINOR" ]; then
> +		_fail "tr: HEXMAJOR and/or HEXMINOR is unset for $ds"
> +	fi
> +
> +	DIR="/sys/dev/block/$(( 0x$HEXMAJOR )):$(( 0x$HEXMINOR ))"
> +
> +	if [ -L "$DIR/device" ]; then # whole disk
> +		DEVHTL="$(basename $(readlink "$DIR/device"))"
> +	elif [ -L "$DIR/../device" ]; then # partition
> +		DEVHTL="$(basename $(readlink "$DIR/../device"))"
> +	else
> +		_fail "tr: Can't locate device backing $ds"
> +	fi
>  
>  	#fail disk
>  	_devmgt_remove ${DEVHTL}
> 
> --
> Jeff Mahoney
> SUSE Labs
> --
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-- 
Dave Chinner
david@fromorbit.com