gfs2: Get rid of gfs2_ea_strlen

Function gfs2_ea_strlen is only called from ea_list_i, so inline it
there.  Remove the duplicate switch statement and the creative use of
memcpy to set a null byte.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: Andrew Price <anprice@redhat.com>
Reviewed-by: Bob Peterson <rpeterso@redhat.com>

fs/gfs2/xattr.c

@@ -343,39 +343,19 @@ struct ea_list {
 	unsigned int ei_size;
 };
 
-static inline unsigned int gfs2_ea_strlen(struct gfs2_ea_header *ea)
-{
-	switch (ea->ea_type) {
-	case GFS2_EATYPE_USR:
-		return 5 + ea->ea_name_len + 1;
-	case GFS2_EATYPE_SYS:
-		return 7 + ea->ea_name_len + 1;
-	case GFS2_EATYPE_SECURITY:
-		return 9 + ea->ea_name_len + 1;
-	default:
-		return 0;
-	}
-}
-
 static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
 		     struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 		     void *private)
 {
 	struct ea_list *ei = private;
 	struct gfs2_ea_request *er = ei->ei_er;
-	unsigned int ea_size = gfs2_ea_strlen(ea);
+	unsigned int ea_size;
+	char *prefix;
+	unsigned int l;
 
 	if (ea->ea_type == GFS2_EATYPE_UNUSED)
 		return 0;
 
-	if (er->er_data_len) {
-		char *prefix = NULL;
-		unsigned int l = 0;
-		char c = 0;
-
-		if (ei->ei_size + ea_size > er->er_data_len)
-			return -ERANGE;
-
 	switch (ea->ea_type) {
 	case GFS2_EATYPE_USR:
 		prefix = "user.";
@@ -389,14 +369,19 @@ static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
 		prefix = "security.";
 		l = 9;
 		break;
+	default:
+		BUG();
 	}
 
-		BUG_ON(l == 0);
+	ea_size = l + ea->ea_name_len + 1;
+	if (er->er_data_len) {
+		if (ei->ei_size + ea_size > er->er_data_len)
+			return -ERANGE;
 
 		memcpy(er->er_data + ei->ei_size, prefix, l);
 		memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
 		       ea->ea_name_len);
-		memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
+		er->er_data[ei->ei_size + ea_size - 1] = 0;
 	}
 
 	ei->ei_size += ea_size;