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.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2014, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * lustre/include/lvfs.h
34 * lustre VFS/process permission interface
40 #include <linux/dcache.h>
41 #include <linux/err.h>
43 #include <linux/mutex.h>
44 #include <linux/namei.h>
45 #include <lustre_compat.h>
47 #define OBD_RUN_CTXT_MAGIC 0xC0FFEEAA
48 #define OBD_CTXT_DEBUG /* development-only debugging */
52 struct lvfs_run_ctxt {
53 struct vfsmount *pwdmnt;
63 static inline void OBD_SET_CTXT_MAGIC(struct lvfs_run_ctxt *ctxt)
66 ctxt->magic = OBD_RUN_CTXT_MAGIC;
70 /* ptlrpc_sec_ctx.c */
71 void push_ctxt(struct lvfs_run_ctxt *save, struct lvfs_run_ctxt *new_ctx);
72 void pop_ctxt(struct lvfs_run_ctxt *saved, struct lvfs_run_ctxt *new_ctx);
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 *
80 ll_lookup_one_len(const char *fid_name, struct dentry *dparent,
83 struct dentry *dchild;
85 inode_lock(dparent->d_inode);
86 dchild = lookup_one_len(fid_name, dparent, fid_namelen);
87 inode_unlock(dparent->d_inode);
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);