[PATCH 3/3] fuse: check O_DIRECT

[Miklos Szeredi <miklos@szeredi.hu>]

Check O_DIRECT and return -EINVAL error in open.  dentry_open() also
checks this but only after the open method is called.  This patch
optimizes away the unnecessary upcalls in this case.

Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>

Index: linux/fs/fuse/file.c
===================================================================
--- linux.orig/fs/fuse/file.c	2005-09-21 11:55:45.000000000 +0200
+++ linux/fs/fuse/file.c	2005-09-23 15:24:23.000000000 +0200
@@ -23,6 +23,10 @@ int fuse_open_common(struct inode *inode
 	struct fuse_file *ff;
 	int err;
 
+	/* VFS checks this, but only _after_ ->open() */
+	if (file->f_flags & O_DIRECT)
+		return -EINVAL;
+
 	err = generic_file_open(inode, file);
 	if (err)
 		return err;
-
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