helpers for acl caching + switch to those

helpers: get_cached_acl(inode, type), set_cached_acl(inode, type, acl),
forget_cached_acl(inode, type).

ubifs/xattr.c needed includes reordered, the rest is a plain switchover.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/jfs/xattr.c b/fs/jfs/xattr.c
index f6e90e3..fad3645 100644
--- a/fs/jfs/xattr.c
+++ b/fs/jfs/xattr.c
@@ -727,10 +727,7 @@
 		/*
 		 * We're changing the ACL.  Get rid of the cached one
 		 */
-		acl =inode->i_acl;
-		if (acl != ACL_NOT_CACHED)
-			posix_acl_release(acl);
-		inode->i_acl = ACL_NOT_CACHED;
+		forget_cached_acl(inode, ACL_TYPE_ACCESS);
 
 		return 0;
 	} else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0) {
@@ -746,10 +743,7 @@
 		/*
 		 * We're changing the default ACL.  Get rid of the cached one
 		 */
-		acl = inode->i_default_acl;
-		if (acl && (acl != ACL_NOT_CACHED))
-			posix_acl_release(acl);
-		inode->i_default_acl = ACL_NOT_CACHED;
+		forget_cached_acl(inode, ACL_TYPE_DEFAULT);
 
 		return 0;
 	}