2 * linux/fs/9p/trans_socket.c
4 * Socket Transport Layer
6 * Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net>
7 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
8 * Copyright (C) 1997-2002 by Ron Minnich <rminnich@sarnoff.com>
9 * Copyright (C) 1995, 1996 by Olaf Kirch <okir@monad.swb.de>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to:
23 * Free Software Foundation
24 * 51 Franklin Street, Fifth Floor
25 * Boston, MA 02111-1301 USA
29 #include <linux/config.h>
31 #include <linux/module.h>
32 #include <linux/net.h>
33 #include <linux/ipv6.h>
34 #include <linux/errno.h>
35 #include <linux/kernel.h>
37 #include <asm/uaccess.h>
38 #include <linux/inet.h>
39 #include <linux/idr.h>
40 #include <linux/file.h>
44 #include "transport.h"
48 struct v9fs_trans_sock {
54 * v9fs_sock_recv - receive from a socket
55 * @v9ses: session information
56 * @v: buffer to receive data into
57 * @len: size of receive buffer
61 static int v9fs_sock_recv(struct v9fs_transport *trans, void *v, int len)
64 struct v9fs_trans_sock *ts;
66 if (!trans || trans->status == Disconnected) {
67 dprintk(DEBUG_ERROR, "disconnected ...\n");
73 if (!(ts->filp->f_flags & O_NONBLOCK))
74 dprintk(DEBUG_ERROR, "blocking read ...\n");
76 ret = kernel_read(ts->filp, ts->filp->f_pos, v, len);
78 if (ret != -ERESTARTSYS && ret != -EAGAIN)
79 trans->status = Disconnected;
86 * v9fs_sock_send - send to a socket
87 * @v9ses: session information
88 * @v: buffer to send data from
89 * @len: size of send buffer
93 static int v9fs_sock_send(struct v9fs_transport *trans, void *v, int len)
97 struct v9fs_trans_sock *ts;
99 if (!trans || trans->status == Disconnected) {
100 dprintk(DEBUG_ERROR, "disconnected ...\n");
106 dprintk(DEBUG_ERROR, "no transport ...\n");
110 if (!(ts->filp->f_flags & O_NONBLOCK))
111 dprintk(DEBUG_ERROR, "blocking write ...\n");
116 ret = vfs_write(ts->filp, (void __user *)v, len, &ts->filp->f_pos);
120 if (ret != -ERESTARTSYS)
121 trans->status = Disconnected;
127 static unsigned int v9fs_sock_poll(struct v9fs_transport *trans,
128 struct poll_table_struct *pt) {
131 struct v9fs_trans_sock *ts;
135 dprintk(DEBUG_ERROR, "no transport\n");
140 if (trans->status != Connected || !ts) {
141 dprintk(DEBUG_ERROR, "transport disconnected: %d\n", trans->status);
148 if (!ts->filp->f_op || !ts->filp->f_op->poll) {
149 dprintk(DEBUG_ERROR, "no poll operation\n");
154 ret = ts->filp->f_op->poll(ts->filp, pt);
163 * v9fs_tcp_init - initialize TCP socket
164 * @v9ses: session information
165 * @addr: address of server to mount
166 * @data: mount options
171 v9fs_tcp_init(struct v9fs_session_info *v9ses, const char *addr, char *data)
173 struct socket *csocket = NULL;
174 struct sockaddr_in sin_server;
176 struct v9fs_trans_sock *ts = NULL;
177 struct v9fs_transport *trans = v9ses->transport;
180 trans->status = Disconnected;
182 ts = kmalloc(sizeof(struct v9fs_trans_sock), GFP_KERNEL);
194 dprintk(DEBUG_TRANS, "Connecting to %s\n", addr);
196 sin_server.sin_family = AF_INET;
197 sin_server.sin_addr.s_addr = in_aton(addr);
198 sin_server.sin_port = htons(v9ses->port);
199 sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket);
200 rc = csocket->ops->connect(csocket,
201 (struct sockaddr *)&sin_server,
202 sizeof(struct sockaddr_in), 0);
205 "v9fs_trans_tcp: problem connecting socket to %s\n",
209 csocket->sk->sk_allocation = GFP_NOIO;
211 fd = sock_map_fd(csocket);
213 sock_release(csocket);
221 ts->filp->f_flags |= O_NONBLOCK;
222 trans->status = Connected;
228 * v9fs_unix_init - initialize UNIX domain socket
229 * @v9ses: session information
230 * @dev_name: path to named pipe
231 * @data: mount options
236 v9fs_unix_init(struct v9fs_session_info *v9ses, const char *dev_name,
240 struct socket *csocket;
241 struct sockaddr_un sun_server;
242 struct v9fs_transport *trans;
243 struct v9fs_trans_sock *ts;
247 trans = v9ses->transport;
249 trans->status = Disconnected;
251 if (strlen(dev_name) > UNIX_PATH_MAX) {
252 eprintk(KERN_ERR, "v9fs_trans_unix: address too long: %s\n",
257 ts = kmalloc(sizeof(struct v9fs_trans_sock), GFP_KERNEL);
265 sun_server.sun_family = PF_UNIX;
266 strcpy(sun_server.sun_path, dev_name);
267 sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket);
268 rc = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
269 sizeof(struct sockaddr_un) - 1, 0); /* -1 *is* important */
272 "v9fs_trans_unix: problem connecting socket: %s: %d\n",
276 csocket->sk->sk_allocation = GFP_NOIO;
278 fd = sock_map_fd(csocket);
280 sock_release(csocket);
288 ts->filp->f_flags |= O_NONBLOCK;
289 trans->status = Connected;
295 * v9fs_sock_close - shutdown socket
296 * @trans: private socket structure
300 static void v9fs_sock_close(struct v9fs_transport *trans)
302 struct v9fs_trans_sock *ts;
309 if ((ts) && (ts->filp)) {
313 trans->status = Disconnected;
321 struct v9fs_transport v9fs_trans_tcp = {
322 .init = v9fs_tcp_init,
323 .write = v9fs_sock_send,
324 .read = v9fs_sock_recv,
325 .close = v9fs_sock_close,
326 .poll = v9fs_sock_poll,
329 struct v9fs_transport v9fs_trans_unix = {
330 .init = v9fs_unix_init,
331 .write = v9fs_sock_send,
332 .read = v9fs_sock_recv,
333 .close = v9fs_sock_close,
334 .poll = v9fs_sock_poll,