NFS: Pass in lookup flags from nfs_atomic_open to nfs_lookup

When doing an open of a directory, ensure that we do pass the lookup flags
from nfs_atomic_open into nfs_lookup.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/dir.c

@@ -1407,6 +1407,7 @@ int nfs_atomic_open(struct inode *dir, struct dentry *dentry,
 	struct dentry *res;
 	struct iattr attr = { .ia_valid = ATTR_OPEN };
 	struct inode *inode;
+	unsigned int lookup_flags = 0;
 	int err;
 
 	/* Expect a negative dentry */
@@ -1429,6 +1430,7 @@ int nfs_atomic_open(struct inode *dir, struct dentry *dentry,
 			 */
 			return -ENOENT;
 		}
+		lookup_flags = LOOKUP_OPEN|LOOKUP_DIRECTORY;
 		goto no_open;
 	}
 
@@ -1479,7 +1481,7 @@ int nfs_atomic_open(struct inode *dir, struct dentry *dentry,
 	return err;
 
 no_open:
-	res = nfs_lookup(dir, dentry, 0);
+	res = nfs_lookup(dir, dentry, lookup_flags);
 	err = PTR_ERR(res);
 	if (IS_ERR(res))
 		goto out;