ia64/linux-2.6.18-xen.hg

view fs/ocfs2/dcache.c @ 524:7f8b544237bf

netfront: Allow netfront in domain 0.

This is useful if your physical network device is in a utility domain.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Tue Apr 15 15:18:58 2008 +0100 (2008-04-15)
parents 831230e53067
children
line source
1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * dcache.c
5 *
6 * dentry cache handling code
7 *
8 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public
21 * License along with this program; if not, write to the
22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 * Boston, MA 021110-1307, USA.
24 */
26 #include <linux/fs.h>
27 #include <linux/types.h>
28 #include <linux/slab.h>
29 #include <linux/namei.h>
31 #define MLOG_MASK_PREFIX ML_DCACHE
32 #include <cluster/masklog.h>
34 #include "ocfs2.h"
36 #include "alloc.h"
37 #include "dcache.h"
38 #include "file.h"
39 #include "inode.h"
41 static int ocfs2_dentry_revalidate(struct dentry *dentry,
42 struct nameidata *nd)
43 {
44 struct inode *inode = dentry->d_inode;
45 int ret = 0; /* if all else fails, just return false */
46 struct ocfs2_super *osb;
48 mlog_entry("(0x%p, '%.*s')\n", dentry,
49 dentry->d_name.len, dentry->d_name.name);
51 /* Never trust a negative dentry - force a new lookup. */
52 if (inode == NULL) {
53 mlog(0, "negative dentry: %.*s\n", dentry->d_name.len,
54 dentry->d_name.name);
55 goto bail;
56 }
58 osb = OCFS2_SB(inode->i_sb);
60 BUG_ON(!osb);
62 if (inode != osb->root_inode) {
63 spin_lock(&OCFS2_I(inode)->ip_lock);
64 /* did we or someone else delete this inode? */
65 if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) {
66 spin_unlock(&OCFS2_I(inode)->ip_lock);
67 mlog(0, "inode (%llu) deleted, returning false\n",
68 (unsigned long long)OCFS2_I(inode)->ip_blkno);
69 goto bail;
70 }
71 spin_unlock(&OCFS2_I(inode)->ip_lock);
73 if (!inode->i_nlink) {
74 mlog(0, "Inode %llu orphaned, returning false "
75 "dir = %d\n",
76 (unsigned long long)OCFS2_I(inode)->ip_blkno,
77 S_ISDIR(inode->i_mode));
78 goto bail;
79 }
80 }
82 ret = 1;
84 bail:
85 mlog_exit(ret);
87 return ret;
88 }
90 struct dentry_operations ocfs2_dentry_ops = {
91 .d_revalidate = ocfs2_dentry_revalidate,
92 };