ovl: Get rid of ovl_xattr_noacl_handlers array

Use an ordinary #ifdef to conditionally include the POSIX ACL handlers
in ovl_xattr_handlers, like the other filesystems do.  Flag the code
that is now only used conditionally with __maybe_unused.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

fs/overlayfs/super.c

@@ -986,7 +986,8 @@ static unsigned int ovl_split_lowerdirs(char *str)
 	return ctr;
 }
 
-static int ovl_posix_acl_xattr_set(const struct xattr_handler *handler,
+static int __maybe_unused
+ovl_posix_acl_xattr_set(const struct xattr_handler *handler,
 			struct dentry *dentry, struct inode *inode,
 			const char *name, const void *value,
 			size_t size, int flags)
@@ -1040,13 +1041,15 @@ static int ovl_own_xattr_set(const struct xattr_handler *handler,
 	return -EPERM;
 }
 
-static const struct xattr_handler ovl_posix_acl_access_xattr_handler = {
+static const struct xattr_handler __maybe_unused
+ovl_posix_acl_access_xattr_handler = {
 	.name = XATTR_NAME_POSIX_ACL_ACCESS,
 	.flags = ACL_TYPE_ACCESS,
 	.set = ovl_posix_acl_xattr_set,
 };
 
-static const struct xattr_handler ovl_posix_acl_default_xattr_handler = {
+static const struct xattr_handler __maybe_unused
+ovl_posix_acl_default_xattr_handler = {
 	.name = XATTR_NAME_POSIX_ACL_DEFAULT,
 	.flags = ACL_TYPE_DEFAULT,
 	.set = ovl_posix_acl_xattr_set,
@@ -1063,19 +1066,15 @@ static const struct xattr_handler ovl_other_xattr_handler = {
 };
 
 static const struct xattr_handler *ovl_xattr_handlers[] = {
+#ifdef CONFIG_FS_POSIX_ACL
 	&ovl_posix_acl_access_xattr_handler,
 	&ovl_posix_acl_default_xattr_handler,
+#endif
 	&ovl_own_xattr_handler,
 	&ovl_other_xattr_handler,
 	NULL
 };
 
-static const struct xattr_handler *ovl_xattr_noacl_handlers[] = {
-	&ovl_own_xattr_handler,
-	&ovl_other_xattr_handler,
-	NULL,
-};
-
 static int ovl_fill_super(struct super_block *sb, void *data, int silent)
 {
 	struct path upperpath = { NULL, NULL };
@@ -1288,10 +1287,7 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
 
 	sb->s_magic = OVERLAYFS_SUPER_MAGIC;
 	sb->s_op = &ovl_super_operations;
-	if (IS_ENABLED(CONFIG_FS_POSIX_ACL))
 	sb->s_xattr = ovl_xattr_handlers;
-	else
-		sb->s_xattr = ovl_xattr_noacl_handlers;
 	sb->s_root = root_dentry;
 	sb->s_fs_info = ufs;
 	sb->s_flags |= MS_POSIXACL;