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
38#include "debug.h"
39#include "v9fs.h"
40#include "9p.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	dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
56
57	return 1;
58}
59
60/**
61 * v9fs_cached_dentry_delete - called when dentry refcount equals 0
62 * @dentry:  dentry in question
63 *
64 * Only return 1 if our inode is invalid.  Only non-synthetic files
65 * (ones without mtime == 0) should be calling this function.
66 *
67 */
68
69static int v9fs_cached_dentry_delete(struct dentry *dentry)
70{
71	struct inode *inode = dentry->d_inode;
72	dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
73
74	if(!inode)
75		return 1;
76
77	return 0;
78}
79
80/**
81 * v9fs_dentry_release - called when dentry is going to be freed
82 * @dentry:  dentry that is being release
83 *
84 */
85
86void v9fs_dentry_release(struct dentry *dentry)
87{
88	int err;
89
90	dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
91
92	if (dentry->d_fsdata != NULL) {
93		struct list_head *fid_list = dentry->d_fsdata;
94		struct v9fs_fid *temp = NULL;
95		struct v9fs_fid *current_fid = NULL;
96
97		list_for_each_entry_safe(current_fid, temp, fid_list, list) {
98			err = v9fs_t_clunk(current_fid->v9ses, current_fid->fid);
99
100			if (err < 0)
101				dprintk(DEBUG_ERROR, "clunk failed: %d name %s\n",
102					err, dentry->d_iname);
103
104			v9fs_fid_destroy(current_fid);
105		}
106
107		kfree(dentry->d_fsdata);	/* free the list_head */
108	}
109}
110
111struct dentry_operations v9fs_cached_dentry_operations = {
112	.d_delete = v9fs_cached_dentry_delete,
113	.d_release = v9fs_dentry_release,
114};
115
116struct dentry_operations v9fs_dentry_operations = {
117	.d_delete = v9fs_dentry_delete,
118	.d_release = v9fs_dentry_release,
119};
120