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Commit | Line | Data |
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426cc91a EVH |
1 | /* |
2 | * linux/fs/9p/trans_fd.c | |
3 | * | |
27979bb2 | 4 | * Fd transport layer. Includes deprecated socket layer. |
426cc91a | 5 | * |
27979bb2 RC |
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> | |
426cc91a EVH |
11 | * |
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. | |
16 | * | |
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. | |
21 | * | |
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 | |
27 | * | |
28 | */ | |
29 | ||
30 | #include <linux/config.h> | |
27979bb2 | 31 | #include <linux/in.h> |
426cc91a EVH |
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> | |
37 | #include <linux/un.h> | |
38 | #include <asm/uaccess.h> | |
39 | #include <linux/inet.h> | |
40 | #include <linux/idr.h> | |
41 | #include <linux/file.h> | |
42 | ||
43 | #include "debug.h" | |
44 | #include "v9fs.h" | |
45 | #include "transport.h" | |
46 | ||
27979bb2 RC |
47 | #define V9FS_PORT 564 |
48 | ||
426cc91a | 49 | struct v9fs_trans_fd { |
27979bb2 RC |
50 | struct file *rd; |
51 | struct file *wr; | |
426cc91a EVH |
52 | }; |
53 | ||
54 | /** | |
27979bb2 | 55 | * v9fs_fd_read- read from a fd |
426cc91a EVH |
56 | * @v9ses: session information |
57 | * @v: buffer to receive data into | |
58 | * @len: size of receive buffer | |
59 | * | |
60 | */ | |
27979bb2 | 61 | static int v9fs_fd_read(struct v9fs_transport *trans, void *v, int len) |
426cc91a | 62 | { |
27979bb2 RC |
63 | int ret; |
64 | struct v9fs_trans_fd *ts; | |
426cc91a | 65 | |
27979bb2 RC |
66 | if (!trans || trans->status == Disconnected || !(ts = trans->priv)) |
67 | return -EREMOTEIO; | |
426cc91a | 68 | |
27979bb2 RC |
69 | if (!(ts->rd->f_flags & O_NONBLOCK)) |
70 | dprintk(DEBUG_ERROR, "blocking read ...\n"); | |
71 | ||
72 | ret = kernel_read(ts->rd, ts->rd->f_pos, v, len); | |
73 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) | |
74 | trans->status = Disconnected; | |
75 | return ret; | |
426cc91a EVH |
76 | } |
77 | ||
78 | /** | |
27979bb2 | 79 | * v9fs_fd_write - write to a socket |
426cc91a EVH |
80 | * @v9ses: session information |
81 | * @v: buffer to send data from | |
82 | * @len: size of send buffer | |
83 | * | |
84 | */ | |
27979bb2 | 85 | static int v9fs_fd_write(struct v9fs_transport *trans, void *v, int len) |
426cc91a | 86 | { |
27979bb2 RC |
87 | int ret; |
88 | mm_segment_t oldfs; | |
89 | struct v9fs_trans_fd *ts; | |
426cc91a | 90 | |
27979bb2 RC |
91 | if (!trans || trans->status == Disconnected || !(ts = trans->priv)) |
92 | return -EREMOTEIO; | |
93 | ||
94 | if (!(ts->wr->f_flags & O_NONBLOCK)) | |
95 | dprintk(DEBUG_ERROR, "blocking write ...\n"); | |
426cc91a | 96 | |
731805b4 | 97 | oldfs = get_fs(); |
426cc91a EVH |
98 | set_fs(get_ds()); |
99 | /* The cast to a user pointer is valid due to the set_fs() */ | |
27979bb2 | 100 | ret = vfs_write(ts->wr, (void __user *)v, len, &ts->wr->f_pos); |
426cc91a EVH |
101 | set_fs(oldfs); |
102 | ||
27979bb2 RC |
103 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) |
104 | trans->status = Disconnected; | |
426cc91a EVH |
105 | return ret; |
106 | } | |
107 | ||
27979bb2 RC |
108 | static unsigned int |
109 | v9fs_fd_poll(struct v9fs_transport *trans, struct poll_table_struct *pt) | |
426cc91a | 110 | { |
27979bb2 RC |
111 | int ret, n; |
112 | struct v9fs_trans_fd *ts; | |
113 | mm_segment_t oldfs; | |
426cc91a | 114 | |
27979bb2 RC |
115 | if (!trans || trans->status != Connected || !(ts = trans->priv)) |
116 | return -EREMOTEIO; | |
426cc91a | 117 | |
27979bb2 RC |
118 | if (!ts->rd->f_op || !ts->rd->f_op->poll) |
119 | return -EIO; | |
426cc91a | 120 | |
27979bb2 RC |
121 | if (!ts->wr->f_op || !ts->wr->f_op->poll) |
122 | return -EIO; | |
426cc91a | 123 | |
27979bb2 RC |
124 | oldfs = get_fs(); |
125 | set_fs(get_ds()); | |
426cc91a | 126 | |
27979bb2 RC |
127 | ret = ts->rd->f_op->poll(ts->rd, pt); |
128 | if (ret < 0) | |
129 | goto end; | |
426cc91a | 130 | |
27979bb2 RC |
131 | if (ts->rd != ts->wr) { |
132 | n = ts->wr->f_op->poll(ts->wr, pt); | |
133 | if (n < 0) { | |
134 | ret = n; | |
135 | goto end; | |
136 | } | |
137 | ret = (ret & ~POLLOUT) | (n & ~POLLIN); | |
138 | } | |
426cc91a | 139 | |
27979bb2 RC |
140 | end: |
141 | set_fs(oldfs); | |
142 | return ret; | |
143 | } | |
144 | ||
145 | static int v9fs_fd_open(struct v9fs_session_info *v9ses, int rfd, int wfd) | |
146 | { | |
147 | struct v9fs_transport *trans = v9ses->transport; | |
148 | struct v9fs_trans_fd *ts = kmalloc(sizeof(struct v9fs_trans_fd), | |
149 | GFP_KERNEL); | |
150 | if (!ts) | |
151 | return -ENOMEM; | |
152 | ||
153 | ts->rd = fget(rfd); | |
154 | ts->wr = fget(wfd); | |
155 | if (!ts->rd || !ts->wr) { | |
156 | if (ts->rd) | |
157 | fput(ts->rd); | |
158 | if (ts->wr) | |
159 | fput(ts->wr); | |
426cc91a EVH |
160 | kfree(ts); |
161 | return -EIO; | |
162 | } | |
163 | ||
164 | trans->priv = ts; | |
165 | trans->status = Connected; | |
166 | ||
167 | return 0; | |
168 | } | |
169 | ||
27979bb2 RC |
170 | static int v9fs_fd_init(struct v9fs_session_info *v9ses, const char *addr, |
171 | char *data) | |
426cc91a | 172 | { |
27979bb2 RC |
173 | if (v9ses->rfdno == ~0 || v9ses->wfdno == ~0) { |
174 | printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n"); | |
175 | return -ENOPROTOOPT; | |
176 | } | |
426cc91a | 177 | |
27979bb2 RC |
178 | return v9fs_fd_open(v9ses, v9ses->rfdno, v9ses->wfdno); |
179 | } | |
426cc91a | 180 | |
27979bb2 RC |
181 | static int v9fs_socket_open(struct v9fs_session_info *v9ses, |
182 | struct socket *csocket) | |
183 | { | |
184 | int fd, ret; | |
185 | ||
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"); | |
189 | ret = fd; | |
190 | release_csocket: | |
191 | sock_release(csocket); | |
192 | return ret; | |
193 | } | |
426cc91a | 194 | |
27979bb2 RC |
195 | if ((ret = v9fs_fd_open(v9ses, fd, fd)) < 0) { |
196 | sockfd_put(csocket); | |
197 | eprintk(KERN_ERR, "v9fs_socket_open: failed to open fd\n"); | |
198 | goto release_csocket; | |
199 | } | |
426cc91a | 200 | |
27979bb2 RC |
201 | ((struct v9fs_trans_fd *)v9ses->transport->priv)->rd->f_flags |= |
202 | O_NONBLOCK; | |
203 | return 0; | |
426cc91a EVH |
204 | } |
205 | ||
27979bb2 RC |
206 | static int v9fs_tcp_init(struct v9fs_session_info *v9ses, const char *addr, |
207 | char *data) | |
3cf6429a | 208 | { |
27979bb2 RC |
209 | int ret; |
210 | struct socket *csocket = NULL; | |
211 | struct sockaddr_in sin_server; | |
212 | ||
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); | |
217 | ||
218 | if (!csocket) { | |
219 | eprintk(KERN_ERR, "v9fs_trans_tcp: problem creating socket\n"); | |
220 | return -1; | |
221 | } | |
3cf6429a | 222 | |
27979bb2 RC |
223 | ret = csocket->ops->connect(csocket, |
224 | (struct sockaddr *)&sin_server, | |
225 | sizeof(struct sockaddr_in), 0); | |
226 | if (ret < 0) { | |
227 | eprintk(KERN_ERR, | |
228 | "v9fs_trans_tcp: problem connecting socket to %s\n", | |
229 | addr); | |
230 | return ret; | |
231 | } | |
3cf6429a | 232 | |
27979bb2 RC |
233 | return v9fs_socket_open(v9ses, csocket); |
234 | } | |
3cf6429a | 235 | |
27979bb2 RC |
236 | static int |
237 | v9fs_unix_init(struct v9fs_session_info *v9ses, const char *addr, char *data) | |
238 | { | |
239 | int ret; | |
240 | struct socket *csocket; | |
241 | struct sockaddr_un sun_server; | |
242 | ||
243 | if (strlen(addr) > UNIX_PATH_MAX) { | |
244 | eprintk(KERN_ERR, "v9fs_trans_unix: address too long: %s\n", | |
245 | addr); | |
246 | return -ENAMETOOLONG; | |
247 | } | |
3cf6429a | 248 | |
27979bb2 RC |
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); | |
254 | if (ret < 0) { | |
255 | eprintk(KERN_ERR, | |
256 | "v9fs_trans_unix: problem connecting socket: %s: %d\n", | |
257 | addr, ret); | |
258 | return ret; | |
3cf6429a LI |
259 | } |
260 | ||
27979bb2 RC |
261 | return v9fs_socket_open(v9ses, csocket); |
262 | } | |
3cf6429a | 263 | |
27979bb2 RC |
264 | /** |
265 | * v9fs_sock_close - shutdown socket | |
266 | * @trans: private socket structure | |
267 | * | |
268 | */ | |
269 | static void v9fs_fd_close(struct v9fs_transport *trans) | |
270 | { | |
271 | struct v9fs_trans_fd *ts; | |
3cf6429a | 272 | |
27979bb2 RC |
273 | if (!trans) |
274 | return; | |
3cf6429a | 275 | |
27979bb2 | 276 | ts = xchg(&trans->priv, NULL); |
3cf6429a | 277 | |
27979bb2 RC |
278 | if (!ts) |
279 | return; | |
3cf6429a | 280 | |
27979bb2 RC |
281 | trans->status = Disconnected; |
282 | if (ts->rd) | |
283 | fput(ts->rd); | |
284 | if (ts->wr) | |
285 | fput(ts->wr); | |
286 | kfree(ts); | |
3cf6429a LI |
287 | } |
288 | ||
426cc91a EVH |
289 | struct v9fs_transport v9fs_trans_fd = { |
290 | .init = v9fs_fd_init, | |
27979bb2 RC |
291 | .write = v9fs_fd_write, |
292 | .read = v9fs_fd_read, | |
426cc91a | 293 | .close = v9fs_fd_close, |
3cf6429a | 294 | .poll = v9fs_fd_poll, |
426cc91a EVH |
295 | }; |
296 | ||
27979bb2 RC |
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, | |
303 | }; | |
304 | ||
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, | |
311 | }; |