vfs: add rcu argument to ->get_acl() callback

Add a rcu argument to the ->get_acl() callback to allow
get_cached_acl_rcu() to call the ->get_acl() method in the next patch.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
diff --git a/fs/jfs/acl.c b/fs/jfs/acl.c
index 43c285c..a653f34 100644
--- a/fs/jfs/acl.c
+++ b/fs/jfs/acl.c
@@ -14,13 +14,16 @@
 #include "jfs_xattr.h"
 #include "jfs_acl.h"
 
-struct posix_acl *jfs_get_acl(struct inode *inode, int type)
+struct posix_acl *jfs_get_acl(struct inode *inode, int type, bool rcu)
 {
 	struct posix_acl *acl;
 	char *ea_name;
 	int size;
 	char *value = NULL;
 
+	if (rcu)
+		return ERR_PTR(-ECHILD);
+
 	switch(type) {
 		case ACL_TYPE_ACCESS:
 			ea_name = XATTR_NAME_POSIX_ACL_ACCESS;