xref: /openbmc/linux/fs/9p/vfs_dentry.c (revision e868d61272caa648214046a096e5a6bfc068dc8c)
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 
37 #include "debug.h"
38 #include "v9fs.h"
39 #include "9p.h"
40 #include "v9fs_vfs.h"
41 #include "fid.h"
42 
43 /**
44  * v9fs_dentry_delete - called when dentry refcount equals 0
45  * @dentry:  dentry in question
46  *
47  * By returning 1 here we should remove cacheing of unused
48  * dentry components.
49  *
50  */
51 
52 static int v9fs_dentry_delete(struct dentry *dentry)
53 {
54 	dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
55 
56 	return 1;
57 }
58 
59 /**
60  * v9fs_cached_dentry_delete - called when dentry refcount equals 0
61  * @dentry:  dentry in question
62  *
63  * Only return 1 if our inode is invalid.  Only non-synthetic files
64  * (ones without mtime == 0) should be calling this function.
65  *
66  */
67 
68 static int v9fs_cached_dentry_delete(struct dentry *dentry)
69 {
70 	struct inode *inode = dentry->d_inode;
71 	dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
72 
73 	if(!inode)
74 		return 1;
75 
76 	return 0;
77 }
78 
79 /**
80  * v9fs_dentry_release - called when dentry is going to be freed
81  * @dentry:  dentry that is being release
82  *
83  */
84 
85 void v9fs_dentry_release(struct dentry *dentry)
86 {
87 	int err;
88 
89 	dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
90 
91 	if (dentry->d_fsdata != NULL) {
92 		struct list_head *fid_list = dentry->d_fsdata;
93 		struct v9fs_fid *temp = NULL;
94 		struct v9fs_fid *current_fid = NULL;
95 
96 		list_for_each_entry_safe(current_fid, temp, fid_list, list) {
97 			err = v9fs_t_clunk(current_fid->v9ses, current_fid->fid);
98 
99 			if (err < 0)
100 				dprintk(DEBUG_ERROR, "clunk failed: %d name %s\n",
101 					err, dentry->d_iname);
102 
103 			v9fs_fid_destroy(current_fid);
104 		}
105 
106 		kfree(dentry->d_fsdata);	/* free the list_head */
107 	}
108 }
109 
110 struct dentry_operations v9fs_cached_dentry_operations = {
111 	.d_delete = v9fs_cached_dentry_delete,
112 	.d_release = v9fs_dentry_release,
113 };
114 
115 struct dentry_operations v9fs_dentry_operations = {
116 	.d_delete = v9fs_dentry_delete,
117 	.d_release = v9fs_dentry_release,
118 };
119