blob: 1a28ef97a3d116f9aa307443794ffe6314fefb60 [file] [log] [blame]
Eric Van Hensbergen426cc912005-09-09 13:04:22 -07001/*
2 * linux/fs/9p/trans_fd.c
3 *
4 * File Descriptor Transport Layer
5 *
Latchesar Ionkov3cf64292006-01-08 01:04:58 -08006 * Copyright (C) 2005 by Latchesar Ionkov <lucho@ionkov.net>
Eric Van Hensbergen426cc912005-09-09 13:04:22 -07007 * Copyright (C) 2005 by Eric Van Hensbergen <ericvh@gmail.com>
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 as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to:
21 * Free Software Foundation
22 * 51 Franklin Street, Fifth Floor
23 * Boston, MA 02111-1301 USA
24 *
25 */
26
27#include <linux/config.h>
28#include <linux/module.h>
29#include <linux/net.h>
30#include <linux/ipv6.h>
31#include <linux/errno.h>
32#include <linux/kernel.h>
33#include <linux/un.h>
34#include <asm/uaccess.h>
35#include <linux/inet.h>
36#include <linux/idr.h>
37#include <linux/file.h>
38
39#include "debug.h"
40#include "v9fs.h"
41#include "transport.h"
42
43struct v9fs_trans_fd {
44 struct file *in_file;
45 struct file *out_file;
46};
47
48/**
49 * v9fs_fd_recv - receive from a socket
50 * @v9ses: session information
51 * @v: buffer to receive data into
52 * @len: size of receive buffer
53 *
54 */
55
56static int v9fs_fd_recv(struct v9fs_transport *trans, void *v, int len)
57{
58 struct v9fs_trans_fd *ts = trans ? trans->priv : NULL;
59
60 if (!trans || trans->status != Connected || !ts)
61 return -EIO;
62
63 return kernel_read(ts->in_file, ts->in_file->f_pos, v, len);
64}
65
66/**
67 * v9fs_fd_send - send to a socket
68 * @v9ses: session information
69 * @v: buffer to send data from
70 * @len: size of send buffer
71 *
72 */
73
74static int v9fs_fd_send(struct v9fs_transport *trans, void *v, int len)
75{
76 struct v9fs_trans_fd *ts = trans ? trans->priv : NULL;
77 mm_segment_t oldfs = get_fs();
78 int ret = 0;
79
80 if (!trans || trans->status != Connected || !ts)
81 return -EIO;
82
83 set_fs(get_ds());
84 /* The cast to a user pointer is valid due to the set_fs() */
85 ret = vfs_write(ts->out_file, (void __user *)v, len, &ts->out_file->f_pos);
86 set_fs(oldfs);
87
88 return ret;
89}
90
91/**
92 * v9fs_fd_init - initialize file descriptor transport
93 * @v9ses: session information
94 * @addr: address of server to mount
95 * @data: mount options
96 *
97 */
98
99static int
100v9fs_fd_init(struct v9fs_session_info *v9ses, const char *addr, char *data)
101{
102 struct v9fs_trans_fd *ts = NULL;
103 struct v9fs_transport *trans = v9ses->transport;
104
105 if((v9ses->wfdno == ~0) || (v9ses->rfdno == ~0)) {
106 printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n");
107 return -ENOPROTOOPT;
108 }
109
Eric Van Hensbergen426cc912005-09-09 13:04:22 -0700110 ts = kmalloc(sizeof(struct v9fs_trans_fd), GFP_KERNEL);
111
112 if (!ts)
113 return -ENOMEM;
114
115 ts->in_file = fget( v9ses->rfdno );
116 ts->out_file = fget( v9ses->wfdno );
117
118 if (!ts->in_file || !ts->out_file) {
119 if (ts->in_file)
120 fput(ts->in_file);
121
122 if (ts->out_file)
123 fput(ts->out_file);
124
125 kfree(ts);
126 return -EIO;
127 }
128
129 trans->priv = ts;
130 trans->status = Connected;
131
132 return 0;
133}
134
135
136/**
137 * v9fs_fd_close - shutdown file descriptor
138 * @trans: private socket structure
139 *
140 */
141
142static void v9fs_fd_close(struct v9fs_transport *trans)
143{
144 struct v9fs_trans_fd *ts;
145
146 if (!trans)
147 return;
148
Eric Van Hensbergenf5ef3c12006-01-08 01:04:56 -0800149 ts = xchg(&trans->priv, NULL);
Eric Van Hensbergen426cc912005-09-09 13:04:22 -0700150
151 if (!ts)
152 return;
153
Eric Van Hensbergenf5ef3c12006-01-08 01:04:56 -0800154 trans->status = Disconnected;
Eric Van Hensbergen426cc912005-09-09 13:04:22 -0700155 if (ts->in_file)
156 fput(ts->in_file);
157
158 if (ts->out_file)
159 fput(ts->out_file);
160
161 kfree(ts);
162}
163
Latchesar Ionkov3cf64292006-01-08 01:04:58 -0800164static unsigned int
165v9fs_fd_poll(struct v9fs_transport *trans, struct poll_table_struct *pt)
166{
167 int ret, n;
168 struct v9fs_trans_fd *ts;
169 mm_segment_t oldfs;
170
171 if (!trans)
172 return -EIO;
173
174 ts = trans->priv;
175 if (trans->status != Connected || !ts)
176 return -EIO;
177
178 oldfs = get_fs();
179 set_fs(get_ds());
180
181 if (!ts->in_file->f_op || !ts->in_file->f_op->poll) {
182 ret = -EIO;
183 goto end;
184 }
185
186 ret = ts->in_file->f_op->poll(ts->in_file, pt);
187
188 if (ts->out_file != ts->in_file) {
189 if (!ts->out_file->f_op || !ts->out_file->f_op->poll) {
190 ret = -EIO;
191 goto end;
192 }
193
194 n = ts->out_file->f_op->poll(ts->out_file, pt);
195
196 ret &= ~POLLOUT;
197 n &= ~POLLIN;
198
199 ret |= n;
200 }
201
202end:
203 set_fs(oldfs);
204 return ret;
205}
206
207
Eric Van Hensbergen426cc912005-09-09 13:04:22 -0700208struct v9fs_transport v9fs_trans_fd = {
209 .init = v9fs_fd_init,
210 .write = v9fs_fd_send,
211 .read = v9fs_fd_recv,
212 .close = v9fs_fd_close,
Latchesar Ionkov3cf64292006-01-08 01:04:58 -0800213 .poll = v9fs_fd_poll,
Eric Van Hensbergen426cc912005-09-09 13:04:22 -0700214};
215