4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2012, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/include/linux/lvfs.h
38 * lustre VFS/process permission interface
41 #ifndef __LINUX_LVFS_H__
42 #define __LINUX_LVFS_H__
45 #error Do not #include this file directly. #include <lvfs.h> instead
48 #include <linux/lustre_compat25.h>
51 #define OBD_RUN_CTXT_MAGIC 0xC0FFEEAA
52 #define OBD_CTXT_DEBUG /* development-only debugging */
56 struct lvfs_run_ctxt {
57 struct vfsmount *pwdmnt;
68 #define OBD_SET_CTXT_MAGIC(ctxt) (ctxt)->magic = OBD_RUN_CTXT_MAGIC
70 #define OBD_SET_CTXT_MAGIC(ctxt) do {} while(0)
74 /* We need to hold the inode semaphore over the dcache lookup itself, or we
75 * run the risk of entering the filesystem lookup path concurrently on SMP
76 * systems, and instantiating two inodes for the same entry. We still
77 * protect against concurrent addition/removal races with the DLM locking.
79 static inline struct dentry *ll_lookup_one_len(const char *fid_name,
80 struct dentry *dparent,
83 struct dentry *dchild;
85 mutex_lock(&dparent->d_inode->i_mutex);
86 dchild = lookup_one_len(fid_name, dparent, fid_namelen);
87 mutex_unlock(&dparent->d_inode->i_mutex);
89 if (IS_ERR(dchild) || dchild->d_inode == NULL)
92 if (is_bad_inode(dchild->d_inode)) {
93 CERROR("bad inode returned %lu/%u\n",
94 dchild->d_inode->i_ino, dchild->d_inode->i_generation);
96 dchild = ERR_PTR(-ENOENT);