tape-admin: update ltfs_reformat()

- only reformat the tape, if the given volume_name is a
  member of the requested pool
- only call mtx to exchange tapes, if the requested
  volume_name is not the loaded and active tape in given drive (slot 0)

Signed-off-by: Ralf Zerres <ralf.zerres@networkx.de>

bin/tape-admin

@@ -803,6 +803,17 @@ ltfs_reformat () {
 	if [ ! -d $ltfs_mountpoint ]; then
 	    mkdir -p $ltfs_mountpoint
 	fi
+	get_mediapool_name "${volume_name}"
+	if [ $? -eq 0 ]; then
+	    get_slot "${mediapool_name}" "${volume_name}"
+	    if [ $? -eq 0 ]; then
+		slot_source=0
+		mtx_getlabel ${slot_source}
+		if [ $? -eq 0 ]; then
+		    if [ ${volume_name_active} != ${volume_name} ]; then
+			mtx_unload ${slot_source}
+			mtx load ${volume_slot}
+		    fi
 		    make_err_file
 		    if [ $verbose -ge 2 ]; then
 			printf "${MAGENTA}LTFS mounting tape ${GREEN}'%s'${MAGENTA} to ${GREEN}'%s'${NO_COLOR}\n" \
@@ -820,6 +831,9 @@ ltfs_reformat () {
 			rm -f ${ERRFILE}
 		    fi
 		fi
+	    fi
+	fi
+    fi
 
     if [ ${#volume_name} -eq 0 ] || [ $volume_name_active = $volume_name ]; then
         tape_id=$(echo $volume_name_active | sed -e 's/\([[:alpha:]]*-\)//g')