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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 <net/9p/9p.h>
38#include <net/9p/client.h>
39
40#include "v9fs.h"
41#include "v9fs_vfs.h"
42#include "fid.h"
43
44/**
45 * v9fs_dentry_delete - called when dentry refcount equals 0
46 * @dentry: dentry in question
47 *
48 * By returning 1 here we should remove cacheing of unused
49 * dentry components.
50 *
51 */
52
53static int v9fs_dentry_delete(struct dentry *dentry)
54{
55 P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_name.name,
56 dentry);
57
58 return 1;
59}
60
61/**
62 * v9fs_cached_dentry_delete - called when dentry refcount equals 0
63 * @dentry: dentry in question
64 *
65 * Only return 1 if our inode is invalid. Only non-synthetic files
66 * (ones without mtime == 0) should be calling this function.
67 *
68 */
69
70static int v9fs_cached_dentry_delete(struct dentry *dentry)
71{
72 struct inode *inode = dentry->d_inode;
73 P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_name.name,
74 dentry);
75
76 if(!inode)
77 return 1;
78
79 return 0;
80}
81
82/**
83 * v9fs_dentry_release - called when dentry is going to be freed
84 * @dentry: dentry that is being release
85 *
86 */
87
88void v9fs_dentry_release(struct dentry *dentry)
89{
90 struct v9fs_dentry *dent;
91 struct p9_fid *temp, *current_fid;
92
93 P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_name.name,
94 dentry);
95 dent = dentry->d_fsdata;
96 if (dent) {
97 list_for_each_entry_safe(current_fid, temp, &dent->fidlist,
98 dlist) {
99 p9_client_clunk(current_fid);
100 }
101
102 kfree(dent);
103 dentry->d_fsdata = NULL;
104 }
105}
106
107const struct dentry_operations v9fs_cached_dentry_operations = {
108 .d_delete = v9fs_cached_dentry_delete,
109 .d_release = v9fs_dentry_release,
110};
111
112const struct dentry_operations v9fs_dentry_operations = {
113 .d_delete = v9fs_dentry_delete,
114 .d_release = v9fs_dentry_release,
115};