afs: Show volume name in /proc/net/afs/<cell>/volumes

Show the name of each volume in /proc/net/afs/<cell>/volumes to make it
easier to work out the name corresponding to a volume ID.  This makes it
easier to work out which mounts in /proc/mounts correspond to which volume
ID.
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Marc Dionne <marc.dionne@auristor.com>

fs/afs/proc.c

@@ -213,13 +213,14 @@ static int afs_proc_cell_volumes_show(struct seq_file *m, void *v)
 
 	/* Display header on line 1 */
 	if (v == &cell->proc_volumes) {
-		seq_puts(m, "USE VID      TY\n");
+		seq_puts(m, "USE VID      TY NAME\n");
 		return 0;
 	}
 
-	seq_printf(m, "%3d %08llx %s\n",
+	seq_printf(m, "%3d %08llx %s %s\n",
 		   atomic_read(&vol->usage), vol->vid,
-		   afs_vol_types[vol->type]);
+		   afs_vol_types[vol->type],
+		   vol->name);
 
 	return 0;
 }