* Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
- * Copyright (c) 2011, 2016, Intel Corporation.
+ * Copyright (c) 2011, 2017, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
#define DEBUG_SUBSYSTEM S_LLITE
#include <obd_support.h>
-#include <lustre/lustre_idl.h>
#include <lustre_dlm.h>
#include "llite_internal.h"
* This avoids a race where ll_lookup_it() instantiates a dentry, but we get
* an AST before calling d_revalidate_it(). The dentry still exists (marked
* INVALID) so d_lookup() matches it, but we have no lock on it (so
- * lock_match() fails) and we spin around real_lookup(). */
+ * lock_match() fails) and we spin around real_lookup().
+ *
+ * This race doesn't apply to lookups in d_alloc_parallel(), and for
+ * those we want to ensure that only one dentry with a given name is
+ * in ll_lookup_nd() at a time. So allow invalid dentries to match
+ * while d_in_lookup(). We will be called again when the lookup
+ * completes, and can give a different answer then.
+ */
#ifdef HAVE_D_COMPARE_7ARGS
static int ll_dcompare(const struct dentry *parent, const struct inode *pinode,
const struct dentry *dentry, const struct inode *inode,
if (d_mountpoint((struct dentry *)dentry))
RETURN(0);
+ /* ensure exclusion against parallel lookup of the same name */
+ if (d_in_lookup((struct dentry *)dentry))
+ return 0;
+
if (d_lustre_invalid(dentry))
RETURN(1);