1/*
2 *  linux/fs/9p/vfs_dentry.c
3 *
4 * This file contians vfs dentry ops for the 9P2000 protocol.
5 *
6 *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
7 *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
8 *
9 *  This program is free software; you can redistribute it and/or modify
10 *  it under the terms of the GNU General Public License version 2
11 *  as published by the Free Software Foundation.
12 *
13 *  This program is distributed in the hope that it will be useful,
14 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
15 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 *  GNU General Public License for more details.
17 *
18 *  You should have received a copy of the GNU General Public License
19 *  along with this program; if not, write to:
20 *  Free Software Foundation
21 *  51 Franklin Street, Fifth Floor
22 *  Boston, MA  02111-1301  USA
23 *
24 */
25
26#include <linux/module.h>
27#include <linux/errno.h>
28#include <linux/fs.h>
29#include <linux/file.h>
30#include <linux/pagemap.h>
31#include <linux/stat.h>
32#include <linux/string.h>
33#include <linux/inet.h>
34#include <linux/namei.h>
35#include <linux/idr.h>
36#include <linux/sched.h>
37#include <linux/slab.h>
38#include <net/9p/9p.h>
39#include <net/9p/client.h>
40
41#include "v9fs.h"
42#include "v9fs_vfs.h"
43#include "fid.h"
44
45/**
46 * v9fs_dentry_delete - called when dentry refcount equals 0
47 * @dentry:  dentry in question
48 *
49 * By returning 1 here we should remove cacheing of unused
50 * dentry components.
51 *
52 */
53
54static int v9fs_dentry_delete(struct dentry *dentry)
55{
56	P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_name.name,
57									dentry);
58
59	return 1;
60}
61
62/**
63 * v9fs_cached_dentry_delete - called when dentry refcount equals 0
64 * @dentry:  dentry in question
65 *
66 * Only return 1 if our inode is invalid.  Only non-synthetic files
67 * (ones without mtime == 0) should be calling this function.
68 *
69 */
70
71static int v9fs_cached_dentry_delete(struct dentry *dentry)
72{
73	struct inode *inode = dentry->d_inode;
74	P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_name.name,
75									dentry);
76
77	if(!inode)
78		return 1;
79
80	return 0;
81}
82
83/**
84 * v9fs_dentry_release - called when dentry is going to be freed
85 * @dentry:  dentry that is being release
86 *
87 */
88
89void v9fs_dentry_release(struct dentry *dentry)
90{
91	struct v9fs_dentry *dent;
92	struct p9_fid *temp, *current_fid;
93
94	P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_name.name,
95									dentry);
96	dent = dentry->d_fsdata;
97	if (dent) {
98		list_for_each_entry_safe(current_fid, temp, &dent->fidlist,
99									dlist) {
100			p9_client_clunk(current_fid);
101		}
102
103		kfree(dent);
104		dentry->d_fsdata = NULL;
105	}
106}
107
108const struct dentry_operations v9fs_cached_dentry_operations = {
109	.d_delete = v9fs_cached_dentry_delete,
110	.d_release = v9fs_dentry_release,
111};
112
113const struct dentry_operations v9fs_dentry_operations = {
114	.d_delete = v9fs_dentry_delete,
115	.d_release = v9fs_dentry_release,
116};
117