xfstests/common: don't assume sysfs attrs all reside under test dev

_require_xfs_sysfs() currently assumes that all sysfs attributes reside
under a device-specific subdirectory in the XFS sysfs hierarchy. It is
hardcoded to use the TEST_DEV mount and expect the relative attribute
path as a parameter.

Not all sysfs attributes are associated with specific devices or mount
points, however. Remove the hardcoded device name part of the attribute
path from _require_xfs_sysfs() and let the caller construct the relative
path based on the sysfs XFS root directory.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

common/rc

@@ -1302,13 +1302,12 @@ _require_xfs_sysfs()
 {
 	attr=$1
 	sysfsdir=/sys/fs/xfs
-	testdev=`_short_dev $TEST_DEV`
 
 	if [ ! -e $sysfsdir ]; then
 		_notrun "no kernel support for XFS sysfs attributes"
 	fi
 
-	if [ ! -z $1 ] && [ ! -e $sysfsdir/$testdev/$attr ]; then
+	if [ ! -z $1 ] && [ ! -e $sysfsdir/$attr ]; then
 		_notrun "sysfs attribute '$attr' is not supported"
 	fi
 }

tests/xfs/011

@@ -85,7 +85,7 @@ _supported_os Linux
 
 _require_scratch
 _require_freeze
-_require_xfs_sysfs log
+_require_xfs_sysfs $(_short_dev $TEST_DEV)/log
 
 rm -f $seqres.full