selinux: Standardize string literal usage for selinuxfs directory names

Switch class and policy_capabilities directory names to be referred to with
global constants, consistent with booleans directory name.  This will allow
for easy consistency of naming in future development.
Signed-off-by: Daniel Burgener <dburgener@linux.microsoft.com>
Acked-by: Stephen Smalley <stephen.smalley.work@gmail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>

security/selinux/selinuxfs.c

@@ -117,6 +117,10 @@ static void selinux_fs_info_free(struct super_block *sb)
 #define SEL_POLICYCAP_INO_OFFSET	0x08000000
 #define SEL_INO_MASK			0x00ffffff
 
+#define BOOL_DIR_NAME "booleans"
+#define CLASS_DIR_NAME "class"
+#define POLICYCAP_DIR_NAME "policy_capabilities"
+
 #define TMPBUFLEN	12
 static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
 				size_t count, loff_t *ppos)
@@ -1361,8 +1365,6 @@ static void sel_remove_entries(struct dentry *de)
 	shrink_dcache_parent(de);
 }
 
-#define BOOL_DIR_NAME "booleans"
-
 static int sel_make_bools(struct selinux_policy *newpolicy, struct dentry *bool_dir,
 			  unsigned int *bool_num, char ***bool_pending_names,
 			  unsigned int **bool_pending_values)
@@ -2078,14 +2080,14 @@ static int sel_fill_super(struct super_block *sb, struct fs_context *fc)
 	if (ret)
 		goto err;
 
-	fsi->class_dir = sel_make_dir(sb->s_root, "class", &fsi->last_ino);
+	fsi->class_dir = sel_make_dir(sb->s_root, CLASS_DIR_NAME, &fsi->last_ino);
 	if (IS_ERR(fsi->class_dir)) {
 		ret = PTR_ERR(fsi->class_dir);
 		fsi->class_dir = NULL;
 		goto err;
 	}
 
-	fsi->policycap_dir = sel_make_dir(sb->s_root, "policy_capabilities",
+	fsi->policycap_dir = sel_make_dir(sb->s_root, POLICYCAP_DIR_NAME,
 					  &fsi->last_ino);
 	if (IS_ERR(fsi->policycap_dir)) {
 		ret = PTR_ERR(fsi->policycap_dir);