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-rw-r--r--fs/ocfs2/dcache.c91
1 files changed, 91 insertions, 0 deletions
diff --git a/fs/ocfs2/dcache.c b/fs/ocfs2/dcache.c
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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 */
25
26#include <linux/fs.h>
27#include <linux/types.h>
28#include <linux/slab.h>
29#include <linux/namei.h>
30
31#define MLOG_MASK_PREFIX ML_DCACHE
32#include <cluster/masklog.h>
33
34#include "ocfs2.h"
35
36#include "alloc.h"
37#include "dcache.h"
38#include "file.h"
39#include "inode.h"
40
41static 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;
47
48 mlog_entry("(0x%p, '%.*s')\n", dentry,
49 dentry->d_name.len, dentry->d_name.name);
50
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 }
57
58 osb = OCFS2_SB(inode->i_sb);
59
60 BUG_ON(!osb);
61
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 (%"MLFu64") deleted, returning false\n",
68 OCFS2_I(inode)->ip_blkno);
69 goto bail;
70 }
71 spin_unlock(&OCFS2_I(inode)->ip_lock);
72
73 if (!inode->i_nlink) {
74 mlog(0, "Inode %"MLFu64" orphaned, returning false "
75 "dir = %d\n", OCFS2_I(inode)->ip_blkno,
76 S_ISDIR(inode->i_mode));
77 goto bail;
78 }
79 }
80
81 ret = 1;
82
83bail:
84 mlog_exit(ret);
85
86 return ret;
87}
88
89struct dentry_operations ocfs2_dentry_ops = {
90 .d_revalidate = ocfs2_dentry_revalidate,
91};