2 * linux/fs/9p/trans_fd.c
4 * Fd transport layer. Includes deprecated socket layer.
6 * Copyright (C) 2006 by Russ Cox <rsc@swtch.com>
7 * Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net>
8 * Copyright (C) 2004-2005 by Eric Van Hensbergen <ericvh@gmail.com>
9 * Copyright (C) 1997-2002 by Ron Minnich <rminnich@sarnoff.com>
10 * Copyright (C) 1995, 1996 by Olaf Kirch <okir@monad.swb.de>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to:
24 * Free Software Foundation
25 * 51 Franklin Street, Fifth Floor
26 * Boston, MA 02111-1301 USA
30 #include <linux/config.h>
32 #include <linux/module.h>
33 #include <linux/net.h>
34 #include <linux/ipv6.h>
35 #include <linux/errno.h>
36 #include <linux/kernel.h>
38 #include <asm/uaccess.h>
39 #include <linux/inet.h>
40 #include <linux/idr.h>
41 #include <linux/file.h>
45 #include "transport.h"
49 struct v9fs_trans_fd {
55 * v9fs_fd_read- read from a fd
56 * @v9ses: session information
57 * @v: buffer to receive data into
58 * @len: size of receive buffer
61 static int v9fs_fd_read(struct v9fs_transport *trans, void *v, int len)
64 struct v9fs_trans_fd *ts;
66 if (!trans || trans->status == Disconnected || !(ts = trans->priv))
69 if (!(ts->rd->f_flags & O_NONBLOCK))
70 dprintk(DEBUG_ERROR, "blocking read ...\n");
72 ret = kernel_read(ts->rd, ts->rd->f_pos, v, len);
73 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
74 trans->status = Disconnected;
79 * v9fs_fd_write - write to a socket
80 * @v9ses: session information
81 * @v: buffer to send data from
82 * @len: size of send buffer
85 static int v9fs_fd_write(struct v9fs_transport *trans, void *v, int len)
89 struct v9fs_trans_fd *ts;
91 if (!trans || trans->status == Disconnected || !(ts = trans->priv))
94 if (!(ts->wr->f_flags & O_NONBLOCK))
95 dprintk(DEBUG_ERROR, "blocking write ...\n");
99 /* The cast to a user pointer is valid due to the set_fs() */
100 ret = vfs_write(ts->wr, (void __user *)v, len, &ts->wr->f_pos);
103 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
104 trans->status = Disconnected;
109 v9fs_fd_poll(struct v9fs_transport *trans, struct poll_table_struct *pt)
112 struct v9fs_trans_fd *ts;
115 if (!trans || trans->status != Connected || !(ts = trans->priv))
118 if (!ts->rd->f_op || !ts->rd->f_op->poll)
121 if (!ts->wr->f_op || !ts->wr->f_op->poll)
127 ret = ts->rd->f_op->poll(ts->rd, pt);
131 if (ts->rd != ts->wr) {
132 n = ts->wr->f_op->poll(ts->wr, pt);
137 ret = (ret & ~POLLOUT) | (n & ~POLLIN);
145 static int v9fs_fd_open(struct v9fs_session_info *v9ses, int rfd, int wfd)
147 struct v9fs_transport *trans = v9ses->transport;
148 struct v9fs_trans_fd *ts = kmalloc(sizeof(struct v9fs_trans_fd),
155 if (!ts->rd || !ts->wr) {
165 trans->status = Connected;
170 static int v9fs_fd_init(struct v9fs_session_info *v9ses, const char *addr,
173 if (v9ses->rfdno == ~0 || v9ses->wfdno == ~0) {
174 printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n");
178 return v9fs_fd_open(v9ses, v9ses->rfdno, v9ses->wfdno);
181 static int v9fs_socket_open(struct v9fs_session_info *v9ses,
182 struct socket *csocket)
186 csocket->sk->sk_allocation = GFP_NOIO;
187 if ((fd = sock_map_fd(csocket)) < 0) {
188 eprintk(KERN_ERR, "v9fs_socket_open: failed to map fd\n");
191 sock_release(csocket);
195 if ((ret = v9fs_fd_open(v9ses, fd, fd)) < 0) {
197 eprintk(KERN_ERR, "v9fs_socket_open: failed to open fd\n");
198 goto release_csocket;
201 ((struct v9fs_trans_fd *)v9ses->transport->priv)->rd->f_flags |=
206 static int v9fs_tcp_init(struct v9fs_session_info *v9ses, const char *addr,
210 struct socket *csocket = NULL;
211 struct sockaddr_in sin_server;
213 sin_server.sin_family = AF_INET;
214 sin_server.sin_addr.s_addr = in_aton(addr);
215 sin_server.sin_port = htons(v9ses->port);
216 sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket);
219 eprintk(KERN_ERR, "v9fs_trans_tcp: problem creating socket\n");
223 ret = csocket->ops->connect(csocket,
224 (struct sockaddr *)&sin_server,
225 sizeof(struct sockaddr_in), 0);
228 "v9fs_trans_tcp: problem connecting socket to %s\n",
233 return v9fs_socket_open(v9ses, csocket);
237 v9fs_unix_init(struct v9fs_session_info *v9ses, const char *addr, char *data)
240 struct socket *csocket;
241 struct sockaddr_un sun_server;
243 if (strlen(addr) > UNIX_PATH_MAX) {
244 eprintk(KERN_ERR, "v9fs_trans_unix: address too long: %s\n",
246 return -ENAMETOOLONG;
249 sun_server.sun_family = PF_UNIX;
250 strcpy(sun_server.sun_path, addr);
251 sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket);
252 ret = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
253 sizeof(struct sockaddr_un) - 1, 0);
256 "v9fs_trans_unix: problem connecting socket: %s: %d\n",
261 return v9fs_socket_open(v9ses, csocket);
265 * v9fs_sock_close - shutdown socket
266 * @trans: private socket structure
269 static void v9fs_fd_close(struct v9fs_transport *trans)
271 struct v9fs_trans_fd *ts;
276 ts = xchg(&trans->priv, NULL);
281 trans->status = Disconnected;
289 struct v9fs_transport v9fs_trans_fd = {
290 .init = v9fs_fd_init,
291 .write = v9fs_fd_write,
292 .read = v9fs_fd_read,
293 .close = v9fs_fd_close,
294 .poll = v9fs_fd_poll,
297 struct v9fs_transport v9fs_trans_tcp = {
298 .init = v9fs_tcp_init,
299 .write = v9fs_fd_write,
300 .read = v9fs_fd_read,
301 .close = v9fs_fd_close,
302 .poll = v9fs_fd_poll,
305 struct v9fs_transport v9fs_trans_unix = {
306 .init = v9fs_unix_init,
307 .write = v9fs_fd_write,
308 .read = v9fs_fd_read,
309 .close = v9fs_fd_close,
310 .poll = v9fs_fd_poll,