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Commit | Line | Data |
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bd238fb4 LI |
1 | /* |
2 | * linux/fs/9p/trans_fd.c | |
3 | * | |
4 | * Fd transport layer. Includes deprecated socket layer. | |
5 | * | |
6 | * Copyright (C) 2006 by Russ Cox <rsc@swtch.com> | |
7 | * Copyright (C) 2004-2005 by Latchesar Ionkov <lucho@ionkov.net> | |
8a0dc95f | 8 | * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com> |
bd238fb4 LI |
9 | * Copyright (C) 1997-2002 by Ron Minnich <rminnich@sarnoff.com> |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 | |
13 | * as published by the Free Software Foundation. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to: | |
22 | * Free Software Foundation | |
23 | * 51 Franklin Street, Fifth Floor | |
24 | * Boston, MA 02111-1301 USA | |
25 | * | |
26 | */ | |
27 | ||
28 | #include <linux/in.h> | |
29 | #include <linux/module.h> | |
30 | #include <linux/net.h> | |
31 | #include <linux/ipv6.h> | |
8a0dc95f | 32 | #include <linux/kthread.h> |
bd238fb4 LI |
33 | #include <linux/errno.h> |
34 | #include <linux/kernel.h> | |
35 | #include <linux/un.h> | |
36 | #include <linux/uaccess.h> | |
37 | #include <linux/inet.h> | |
38 | #include <linux/idr.h> | |
39 | #include <linux/file.h> | |
a80d923e | 40 | #include <linux/parser.h> |
bd238fb4 | 41 | #include <net/9p/9p.h> |
8b81ef58 | 42 | #include <net/9p/client.h> |
bd238fb4 LI |
43 | #include <net/9p/transport.h> |
44 | ||
45 | #define P9_PORT 564 | |
a80d923e | 46 | #define MAX_SOCK_BUF (64*1024) |
8a0dc95f | 47 | #define MAXPOLLWADDR 2 |
a80d923e | 48 | |
ee443996 EVH |
49 | /** |
50 | * struct p9_fd_opts - per-transport options | |
51 | * @rfd: file descriptor for reading (trans=fd) | |
52 | * @wfd: file descriptor for writing (trans=fd) | |
53 | * @port: port to connect to (trans=tcp) | |
54 | * | |
55 | */ | |
56 | ||
a80d923e EVH |
57 | struct p9_fd_opts { |
58 | int rfd; | |
59 | int wfd; | |
60 | u16 port; | |
61 | }; | |
bd238fb4 | 62 | |
ee443996 EVH |
63 | /** |
64 | * struct p9_trans_fd - transport state | |
65 | * @rd: reference to file to read from | |
66 | * @wr: reference of file to write to | |
67 | * @conn: connection state reference | |
68 | * | |
69 | */ | |
70 | ||
bd238fb4 LI |
71 | struct p9_trans_fd { |
72 | struct file *rd; | |
73 | struct file *wr; | |
8a0dc95f | 74 | struct p9_conn *conn; |
bd238fb4 LI |
75 | }; |
76 | ||
a80d923e EVH |
77 | /* |
78 | * Option Parsing (code inspired by NFS code) | |
79 | * - a little lazy - parse all fd-transport options | |
80 | */ | |
bd238fb4 | 81 | |
a80d923e EVH |
82 | enum { |
83 | /* Options that take integer arguments */ | |
55762690 | 84 | Opt_port, Opt_rfdno, Opt_wfdno, Opt_err, |
a80d923e | 85 | }; |
bd238fb4 | 86 | |
a447c093 | 87 | static const match_table_t tokens = { |
a80d923e EVH |
88 | {Opt_port, "port=%u"}, |
89 | {Opt_rfdno, "rfdno=%u"}, | |
90 | {Opt_wfdno, "wfdno=%u"}, | |
55762690 | 91 | {Opt_err, NULL}, |
a80d923e | 92 | }; |
bd238fb4 | 93 | |
8a0dc95f EVH |
94 | enum { |
95 | Rworksched = 1, /* read work scheduled or running */ | |
96 | Rpending = 2, /* can read */ | |
97 | Wworksched = 4, /* write work scheduled or running */ | |
98 | Wpending = 8, /* can write */ | |
99 | }; | |
100 | ||
992b3f1d TH |
101 | struct p9_poll_wait { |
102 | struct p9_conn *conn; | |
103 | wait_queue_t wait; | |
104 | wait_queue_head_t *wait_addr; | |
ee443996 EVH |
105 | }; |
106 | ||
107 | /** | |
108 | * struct p9_conn - fd mux connection state information | |
ee443996 | 109 | * @mux_list: list link for mux to manage multiple connections (?) |
8b81ef58 | 110 | * @client: reference to client instance for this connection |
ee443996 | 111 | * @err: error state |
ee443996 EVH |
112 | * @req_list: accounting for requests which have been sent |
113 | * @unsent_req_list: accounting for requests that haven't been sent | |
114 | * @rcall: current response &p9_fcall structure | |
115 | * @rpos: read position in current frame | |
116 | * @rbuf: current read buffer | |
117 | * @wpos: write position for current frame | |
118 | * @wsize: amount of data to write for current frame | |
119 | * @wbuf: current write buffer | |
120 | * @poll_wait: array of wait_q's for various worker threads | |
121 | * @poll_waddr: ???? | |
122 | * @pt: poll state | |
123 | * @rq: current read work | |
124 | * @wq: current write work | |
125 | * @wsched: ???? | |
126 | * | |
127 | */ | |
8a0dc95f EVH |
128 | |
129 | struct p9_conn { | |
8a0dc95f | 130 | struct list_head mux_list; |
8b81ef58 | 131 | struct p9_client *client; |
8a0dc95f | 132 | int err; |
8a0dc95f EVH |
133 | struct list_head req_list; |
134 | struct list_head unsent_req_list; | |
135 | struct p9_fcall *rcall; | |
136 | int rpos; | |
137 | char *rbuf; | |
138 | int wpos; | |
139 | int wsize; | |
140 | char *wbuf; | |
992b3f1d TH |
141 | struct list_head poll_pending_link; |
142 | struct p9_poll_wait poll_wait[MAXPOLLWADDR]; | |
8a0dc95f EVH |
143 | poll_table pt; |
144 | struct work_struct rq; | |
145 | struct work_struct wq; | |
146 | unsigned long wsched; | |
147 | }; | |
148 | ||
992b3f1d TH |
149 | static DEFINE_SPINLOCK(p9_poll_lock); |
150 | static LIST_HEAD(p9_poll_pending_list); | |
8a0dc95f | 151 | static struct workqueue_struct *p9_mux_wq; |
992b3f1d | 152 | static struct task_struct *p9_poll_task; |
8a0dc95f | 153 | |
992b3f1d | 154 | static void p9_mux_poll_stop(struct p9_conn *m) |
8a0dc95f | 155 | { |
992b3f1d TH |
156 | unsigned long flags; |
157 | int i; | |
8a0dc95f | 158 | |
992b3f1d TH |
159 | for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { |
160 | struct p9_poll_wait *pwait = &m->poll_wait[i]; | |
8a0dc95f | 161 | |
992b3f1d TH |
162 | if (pwait->wait_addr) { |
163 | remove_wait_queue(pwait->wait_addr, &pwait->wait); | |
164 | pwait->wait_addr = NULL; | |
8a0dc95f | 165 | } |
8a0dc95f EVH |
166 | } |
167 | ||
992b3f1d TH |
168 | spin_lock_irqsave(&p9_poll_lock, flags); |
169 | list_del_init(&m->poll_pending_link); | |
170 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
8a0dc95f EVH |
171 | } |
172 | ||
673d62cd | 173 | static void p9_conn_rpc_cb(struct p9_client *, struct p9_req_t *); |
044c7768 | 174 | |
673d62cd | 175 | static void p9_mux_flush_cb(struct p9_client *client, struct p9_req_t *freq) |
044c7768 | 176 | { |
673d62cd EVH |
177 | struct p9_conn *m = client->trans; |
178 | struct p9_req_t *req; | |
044c7768 EVH |
179 | |
180 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p tc %p rc %p err %d oldtag %d\n", m, | |
673d62cd EVH |
181 | freq->tc, freq->rc, freq->t_err, |
182 | freq->tc->params.tflush.oldtag); | |
044c7768 | 183 | |
673d62cd | 184 | req = p9_tag_lookup(client, freq->tc->params.tflush.oldtag); |
044c7768 | 185 | if (req) { |
673d62cd EVH |
186 | req->status = REQ_STATUS_FLSHD; |
187 | list_del(&req->req_list); | |
188 | p9_conn_rpc_cb(client, req); | |
044c7768 EVH |
189 | } |
190 | ||
673d62cd | 191 | p9_free_req(client, freq); |
044c7768 EVH |
192 | } |
193 | ||
673d62cd | 194 | static void p9_conn_rpc_cb(struct p9_client *client, struct p9_req_t *req) |
044c7768 EVH |
195 | { |
196 | P9_DPRINTK(P9_DEBUG_MUX, "req %p\n", req); | |
197 | ||
673d62cd | 198 | if (req->tc->id == P9_TFLUSH) { /* flush callback */ |
044c7768 | 199 | P9_DPRINTK(P9_DEBUG_MUX, "flush req %p\n", req); |
673d62cd | 200 | p9_mux_flush_cb(client, req); |
044c7768 EVH |
201 | } else { /* normal wakeup path */ |
202 | P9_DPRINTK(P9_DEBUG_MUX, "normal req %p\n", req); | |
673d62cd EVH |
203 | if (!req->t_err && (req->status == REQ_STATUS_FLSHD || |
204 | req->status == REQ_STATUS_FLSH)) | |
205 | req->t_err = -ERESTARTSYS; | |
044c7768 | 206 | |
673d62cd | 207 | wake_up(req->wq); |
044c7768 EVH |
208 | } |
209 | } | |
210 | ||
8a0dc95f | 211 | /** |
5503ac56 EVH |
212 | * p9_conn_cancel - cancel all pending requests with error |
213 | * @m: mux data | |
214 | * @err: error code | |
8a0dc95f | 215 | * |
8a0dc95f | 216 | */ |
ee443996 | 217 | |
5503ac56 | 218 | void p9_conn_cancel(struct p9_conn *m, int err) |
8a0dc95f | 219 | { |
673d62cd | 220 | struct p9_req_t *req, *rtmp; |
5503ac56 | 221 | LIST_HEAD(cancel_list); |
8a0dc95f | 222 | |
5503ac56 EVH |
223 | P9_DPRINTK(P9_DEBUG_ERROR, "mux %p err %d\n", m, err); |
224 | m->err = err; | |
673d62cd | 225 | spin_lock(&m->client->lock); |
5503ac56 | 226 | list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) { |
673d62cd EVH |
227 | req->status = REQ_STATUS_ERROR; |
228 | if (!req->t_err) | |
229 | req->t_err = err; | |
5503ac56 EVH |
230 | list_move(&req->req_list, &cancel_list); |
231 | } | |
232 | list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) { | |
673d62cd EVH |
233 | req->status = REQ_STATUS_ERROR; |
234 | if (!req->t_err) | |
235 | req->t_err = err; | |
5503ac56 | 236 | list_move(&req->req_list, &cancel_list); |
8a0dc95f | 237 | } |
673d62cd | 238 | spin_unlock(&m->client->lock); |
8a0dc95f | 239 | |
5503ac56 EVH |
240 | list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) { |
241 | list_del(&req->req_list); | |
673d62cd | 242 | p9_conn_rpc_cb(m->client, req); |
8a0dc95f | 243 | } |
5503ac56 | 244 | } |
8a0dc95f | 245 | |
673d62cd | 246 | static void process_request(struct p9_conn *m, struct p9_req_t *req) |
5503ac56 EVH |
247 | { |
248 | int ecode; | |
249 | struct p9_str *ename; | |
8a0dc95f | 250 | |
673d62cd EVH |
251 | if (!req->t_err && req->rc->id == P9_RERROR) { |
252 | ecode = req->rc->params.rerror.errno; | |
253 | ename = &req->rc->params.rerror.error; | |
5503ac56 EVH |
254 | |
255 | P9_DPRINTK(P9_DEBUG_MUX, "Rerror %.*s\n", ename->len, | |
256 | ename->str); | |
257 | ||
258 | if (m->client->dotu) | |
673d62cd | 259 | req->t_err = -ecode; |
5503ac56 | 260 | |
673d62cd EVH |
261 | if (!req->t_err) { |
262 | req->t_err = p9_errstr2errno(ename->str, ename->len); | |
5503ac56 EVH |
263 | |
264 | /* string match failed */ | |
673d62cd EVH |
265 | if (!req->t_err) { |
266 | PRINT_FCALL_ERROR("unknown error", req->rc); | |
267 | req->t_err = -ESERVERFAULT; | |
5503ac56 | 268 | } |
8a0dc95f | 269 | } |
673d62cd | 270 | } else if (req->tc && req->rc->id != req->tc->id + 1) { |
5503ac56 EVH |
271 | P9_DPRINTK(P9_DEBUG_ERROR, |
272 | "fcall mismatch: expected %d, got %d\n", | |
673d62cd EVH |
273 | req->tc->id + 1, req->rc->id); |
274 | if (!req->t_err) | |
275 | req->t_err = -EIO; | |
8a0dc95f | 276 | } |
8a0dc95f EVH |
277 | } |
278 | ||
5503ac56 EVH |
279 | static unsigned int |
280 | p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt) | |
8a0dc95f | 281 | { |
5503ac56 EVH |
282 | int ret, n; |
283 | struct p9_trans_fd *ts = NULL; | |
8a0dc95f | 284 | |
5503ac56 EVH |
285 | if (client && client->status == Connected) |
286 | ts = client->trans; | |
7dc5d24b | 287 | |
5503ac56 EVH |
288 | if (!ts) |
289 | return -EREMOTEIO; | |
7dc5d24b | 290 | |
5503ac56 EVH |
291 | if (!ts->rd->f_op || !ts->rd->f_op->poll) |
292 | return -EIO; | |
8a0dc95f | 293 | |
5503ac56 EVH |
294 | if (!ts->wr->f_op || !ts->wr->f_op->poll) |
295 | return -EIO; | |
992b3f1d | 296 | |
5503ac56 EVH |
297 | ret = ts->rd->f_op->poll(ts->rd, pt); |
298 | if (ret < 0) | |
299 | return ret; | |
992b3f1d | 300 | |
5503ac56 EVH |
301 | if (ts->rd != ts->wr) { |
302 | n = ts->wr->f_op->poll(ts->wr, pt); | |
303 | if (n < 0) | |
304 | return n; | |
305 | ret = (ret & ~POLLOUT) | (n & ~POLLIN); | |
306 | } | |
307 | ||
308 | return ret; | |
992b3f1d TH |
309 | } |
310 | ||
8a0dc95f | 311 | /** |
5503ac56 EVH |
312 | * p9_fd_read- read from a fd |
313 | * @client: client instance | |
314 | * @v: buffer to receive data into | |
315 | * @len: size of receive buffer | |
ee443996 | 316 | * |
8a0dc95f | 317 | */ |
ee443996 | 318 | |
5503ac56 | 319 | static int p9_fd_read(struct p9_client *client, void *v, int len) |
8a0dc95f | 320 | { |
5503ac56 EVH |
321 | int ret; |
322 | struct p9_trans_fd *ts = NULL; | |
8a0dc95f | 323 | |
5503ac56 EVH |
324 | if (client && client->status != Disconnected) |
325 | ts = client->trans; | |
8a0dc95f | 326 | |
5503ac56 EVH |
327 | if (!ts) |
328 | return -EREMOTEIO; | |
8a0dc95f | 329 | |
5503ac56 EVH |
330 | if (!(ts->rd->f_flags & O_NONBLOCK)) |
331 | P9_DPRINTK(P9_DEBUG_ERROR, "blocking read ...\n"); | |
8a0dc95f | 332 | |
5503ac56 EVH |
333 | ret = kernel_read(ts->rd, ts->rd->f_pos, v, len); |
334 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) | |
335 | client->status = Disconnected; | |
336 | return ret; | |
8a0dc95f EVH |
337 | } |
338 | ||
339 | /** | |
5503ac56 EVH |
340 | * p9_read_work - called when there is some data to be read from a transport |
341 | * @work: container of work to be done | |
ee443996 | 342 | * |
8a0dc95f | 343 | */ |
ee443996 | 344 | |
5503ac56 | 345 | static void p9_read_work(struct work_struct *work) |
8a0dc95f | 346 | { |
5503ac56 EVH |
347 | int n, err; |
348 | struct p9_conn *m; | |
673d62cd | 349 | struct p9_req_t *req; |
5503ac56 EVH |
350 | struct p9_fcall *rcall; |
351 | char *rbuf; | |
352 | ||
353 | m = container_of(work, struct p9_conn, rq); | |
8a0dc95f EVH |
354 | |
355 | if (m->err < 0) | |
356 | return; | |
357 | ||
5503ac56 EVH |
358 | rcall = NULL; |
359 | P9_DPRINTK(P9_DEBUG_MUX, "start mux %p pos %d\n", m, m->rpos); | |
8a0dc95f | 360 | |
5503ac56 EVH |
361 | if (!m->rcall) { |
362 | m->rcall = | |
363 | kmalloc(sizeof(struct p9_fcall) + m->client->msize, | |
364 | GFP_KERNEL); | |
365 | if (!m->rcall) { | |
366 | err = -ENOMEM; | |
367 | goto error; | |
8a0dc95f | 368 | } |
5503ac56 EVH |
369 | |
370 | m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall); | |
371 | m->rpos = 0; | |
8a0dc95f EVH |
372 | } |
373 | ||
5503ac56 EVH |
374 | clear_bit(Rpending, &m->wsched); |
375 | err = p9_fd_read(m->client, m->rbuf + m->rpos, | |
376 | m->client->msize - m->rpos); | |
377 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p got %d bytes\n", m, err); | |
378 | if (err == -EAGAIN) { | |
379 | clear_bit(Rworksched, &m->wsched); | |
380 | return; | |
8a0dc95f | 381 | } |
8a0dc95f | 382 | |
5503ac56 EVH |
383 | if (err <= 0) |
384 | goto error; | |
385 | ||
386 | m->rpos += err; | |
387 | while (m->rpos > 4) { | |
388 | n = le32_to_cpu(*(__le32 *) m->rbuf); | |
389 | if (n >= m->client->msize) { | |
390 | P9_DPRINTK(P9_DEBUG_ERROR, | |
391 | "requested packet size too big: %d\n", n); | |
392 | err = -EIO; | |
393 | goto error; | |
394 | } | |
395 | ||
396 | if (m->rpos < n) | |
397 | break; | |
398 | ||
399 | err = | |
400 | p9_deserialize_fcall(m->rbuf, n, m->rcall, m->client->dotu); | |
401 | if (err < 0) | |
402 | goto error; | |
403 | ||
404 | #ifdef CONFIG_NET_9P_DEBUG | |
405 | if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) { | |
406 | char buf[150]; | |
407 | ||
408 | p9_printfcall(buf, sizeof(buf), m->rcall, | |
409 | m->client->dotu); | |
410 | printk(KERN_NOTICE ">>> %p %s\n", m, buf); | |
411 | } | |
412 | #endif | |
413 | ||
414 | rcall = m->rcall; | |
415 | rbuf = m->rbuf; | |
416 | if (m->rpos > n) { | |
417 | m->rcall = kmalloc(sizeof(struct p9_fcall) + | |
418 | m->client->msize, GFP_KERNEL); | |
419 | if (!m->rcall) { | |
420 | err = -ENOMEM; | |
421 | goto error; | |
422 | } | |
423 | ||
424 | m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall); | |
425 | memmove(m->rbuf, rbuf + n, m->rpos - n); | |
426 | m->rpos -= n; | |
427 | } else { | |
428 | m->rcall = NULL; | |
429 | m->rbuf = NULL; | |
430 | m->rpos = 0; | |
431 | } | |
432 | ||
433 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p fcall id %d tag %d\n", m, | |
434 | rcall->id, rcall->tag); | |
435 | ||
673d62cd | 436 | req = p9_tag_lookup(m->client, rcall->tag); |
5503ac56 EVH |
437 | |
438 | if (req) { | |
673d62cd EVH |
439 | if (req->status != REQ_STATUS_FLSH) { |
440 | list_del(&req->req_list); | |
441 | req->status = REQ_STATUS_RCVD; | |
442 | } | |
443 | ||
444 | req->rc = rcall; | |
5503ac56 EVH |
445 | process_request(m, req); |
446 | ||
673d62cd EVH |
447 | if (req->status != REQ_STATUS_FLSH) |
448 | p9_conn_rpc_cb(m->client, req); | |
5503ac56 EVH |
449 | } else { |
450 | if (err >= 0 && rcall->id != P9_RFLUSH) | |
451 | P9_DPRINTK(P9_DEBUG_ERROR, | |
452 | "unexpected response mux %p id %d tag %d\n", | |
453 | m, rcall->id, rcall->tag); | |
454 | kfree(rcall); | |
455 | } | |
456 | } | |
457 | ||
458 | if (!list_empty(&m->req_list)) { | |
459 | if (test_and_clear_bit(Rpending, &m->wsched)) | |
460 | n = POLLIN; | |
461 | else | |
462 | n = p9_fd_poll(m->client, NULL); | |
463 | ||
464 | if (n & POLLIN) { | |
465 | P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m); | |
466 | queue_work(p9_mux_wq, &m->rq); | |
467 | } else | |
468 | clear_bit(Rworksched, &m->wsched); | |
469 | } else | |
470 | clear_bit(Rworksched, &m->wsched); | |
471 | ||
472 | return; | |
473 | ||
474 | error: | |
475 | p9_conn_cancel(m, err); | |
476 | clear_bit(Rworksched, &m->wsched); | |
477 | } | |
478 | ||
479 | /** | |
480 | * p9_fd_write - write to a socket | |
481 | * @client: client instance | |
482 | * @v: buffer to send data from | |
483 | * @len: size of send buffer | |
ee443996 | 484 | * |
8a0dc95f | 485 | */ |
ee443996 | 486 | |
5503ac56 | 487 | static int p9_fd_write(struct p9_client *client, void *v, int len) |
8a0dc95f | 488 | { |
5503ac56 EVH |
489 | int ret; |
490 | mm_segment_t oldfs; | |
491 | struct p9_trans_fd *ts = NULL; | |
8a0dc95f | 492 | |
5503ac56 EVH |
493 | if (client && client->status != Disconnected) |
494 | ts = client->trans; | |
8a0dc95f | 495 | |
5503ac56 EVH |
496 | if (!ts) |
497 | return -EREMOTEIO; | |
8a0dc95f | 498 | |
5503ac56 EVH |
499 | if (!(ts->wr->f_flags & O_NONBLOCK)) |
500 | P9_DPRINTK(P9_DEBUG_ERROR, "blocking write ...\n"); | |
992b3f1d | 501 | |
5503ac56 EVH |
502 | oldfs = get_fs(); |
503 | set_fs(get_ds()); | |
504 | /* The cast to a user pointer is valid due to the set_fs() */ | |
505 | ret = vfs_write(ts->wr, (void __user *)v, len, &ts->wr->f_pos); | |
506 | set_fs(oldfs); | |
992b3f1d | 507 | |
5503ac56 EVH |
508 | if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN) |
509 | client->status = Disconnected; | |
510 | return ret; | |
8a0dc95f EVH |
511 | } |
512 | ||
513 | /** | |
514 | * p9_write_work - called when a transport can send some data | |
ee443996 EVH |
515 | * @work: container for work to be done |
516 | * | |
8a0dc95f | 517 | */ |
ee443996 | 518 | |
8a0dc95f EVH |
519 | static void p9_write_work(struct work_struct *work) |
520 | { | |
521 | int n, err; | |
522 | struct p9_conn *m; | |
673d62cd | 523 | struct p9_req_t *req; |
8a0dc95f EVH |
524 | |
525 | m = container_of(work, struct p9_conn, wq); | |
526 | ||
527 | if (m->err < 0) { | |
528 | clear_bit(Wworksched, &m->wsched); | |
529 | return; | |
530 | } | |
531 | ||
532 | if (!m->wsize) { | |
533 | if (list_empty(&m->unsent_req_list)) { | |
534 | clear_bit(Wworksched, &m->wsched); | |
535 | return; | |
536 | } | |
537 | ||
673d62cd EVH |
538 | spin_lock(&m->client->lock); |
539 | req = list_entry(m->unsent_req_list.next, struct p9_req_t, | |
8a0dc95f | 540 | req_list); |
673d62cd | 541 | req->status = REQ_STATUS_SENT; |
8a0dc95f | 542 | list_move_tail(&req->req_list, &m->req_list); |
8a0dc95f | 543 | |
673d62cd EVH |
544 | m->wbuf = req->tc->sdata; |
545 | m->wsize = req->tc->size; | |
8a0dc95f | 546 | m->wpos = 0; |
673d62cd | 547 | spin_unlock(&m->client->lock); |
8a0dc95f EVH |
548 | } |
549 | ||
550 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p pos %d size %d\n", m, m->wpos, | |
551 | m->wsize); | |
552 | clear_bit(Wpending, &m->wsched); | |
8b81ef58 | 553 | err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos); |
8a0dc95f EVH |
554 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p sent %d bytes\n", m, err); |
555 | if (err == -EAGAIN) { | |
556 | clear_bit(Wworksched, &m->wsched); | |
557 | return; | |
558 | } | |
559 | ||
560 | if (err < 0) | |
561 | goto error; | |
562 | else if (err == 0) { | |
563 | err = -EREMOTEIO; | |
564 | goto error; | |
565 | } | |
566 | ||
567 | m->wpos += err; | |
568 | if (m->wpos == m->wsize) | |
569 | m->wpos = m->wsize = 0; | |
570 | ||
571 | if (m->wsize == 0 && !list_empty(&m->unsent_req_list)) { | |
572 | if (test_and_clear_bit(Wpending, &m->wsched)) | |
573 | n = POLLOUT; | |
574 | else | |
8b81ef58 | 575 | n = p9_fd_poll(m->client, NULL); |
8a0dc95f EVH |
576 | |
577 | if (n & POLLOUT) { | |
578 | P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m); | |
579 | queue_work(p9_mux_wq, &m->wq); | |
580 | } else | |
581 | clear_bit(Wworksched, &m->wsched); | |
582 | } else | |
583 | clear_bit(Wworksched, &m->wsched); | |
584 | ||
585 | return; | |
586 | ||
587 | error: | |
588 | p9_conn_cancel(m, err); | |
589 | clear_bit(Wworksched, &m->wsched); | |
590 | } | |
591 | ||
5503ac56 | 592 | static int p9_pollwake(wait_queue_t *wait, unsigned mode, int sync, void *key) |
8a0dc95f | 593 | { |
5503ac56 EVH |
594 | struct p9_poll_wait *pwait = |
595 | container_of(wait, struct p9_poll_wait, wait); | |
596 | struct p9_conn *m = pwait->conn; | |
597 | unsigned long flags; | |
598 | DECLARE_WAITQUEUE(dummy_wait, p9_poll_task); | |
8a0dc95f | 599 | |
5503ac56 EVH |
600 | spin_lock_irqsave(&p9_poll_lock, flags); |
601 | if (list_empty(&m->poll_pending_link)) | |
602 | list_add_tail(&m->poll_pending_link, &p9_poll_pending_list); | |
603 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
8a0dc95f | 604 | |
5503ac56 EVH |
605 | /* perform the default wake up operation */ |
606 | return default_wake_function(&dummy_wait, mode, sync, key); | |
8a0dc95f EVH |
607 | } |
608 | ||
609 | /** | |
5503ac56 EVH |
610 | * p9_pollwait - add poll task to the wait queue |
611 | * @filp: file pointer being polled | |
612 | * @wait_address: wait_q to block on | |
613 | * @p: poll state | |
ee443996 | 614 | * |
5503ac56 | 615 | * called by files poll operation to add v9fs-poll task to files wait queue |
8a0dc95f | 616 | */ |
ee443996 | 617 | |
5503ac56 EVH |
618 | static void |
619 | p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p) | |
8a0dc95f | 620 | { |
5503ac56 EVH |
621 | struct p9_conn *m = container_of(p, struct p9_conn, pt); |
622 | struct p9_poll_wait *pwait = NULL; | |
623 | int i; | |
8a0dc95f | 624 | |
5503ac56 EVH |
625 | for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { |
626 | if (m->poll_wait[i].wait_addr == NULL) { | |
627 | pwait = &m->poll_wait[i]; | |
628 | break; | |
8a0dc95f | 629 | } |
8a0dc95f EVH |
630 | } |
631 | ||
5503ac56 EVH |
632 | if (!pwait) { |
633 | P9_DPRINTK(P9_DEBUG_ERROR, "not enough wait_address slots\n"); | |
8a0dc95f EVH |
634 | return; |
635 | } | |
636 | ||
5503ac56 EVH |
637 | if (!wait_address) { |
638 | P9_DPRINTK(P9_DEBUG_ERROR, "no wait_address\n"); | |
639 | pwait->wait_addr = ERR_PTR(-EIO); | |
640 | return; | |
641 | } | |
8a0dc95f | 642 | |
5503ac56 EVH |
643 | pwait->conn = m; |
644 | pwait->wait_addr = wait_address; | |
645 | init_waitqueue_func_entry(&pwait->wait, p9_pollwake); | |
646 | add_wait_queue(wait_address, &pwait->wait); | |
647 | } | |
8a0dc95f | 648 | |
5503ac56 EVH |
649 | /** |
650 | * p9_conn_create - allocate and initialize the per-session mux data | |
651 | * @client: client instance | |
652 | * | |
653 | * Note: Creates the polling task if this is the first session. | |
654 | */ | |
8a0dc95f | 655 | |
5503ac56 EVH |
656 | static struct p9_conn *p9_conn_create(struct p9_client *client) |
657 | { | |
658 | int i, n; | |
659 | struct p9_conn *m; | |
8a0dc95f | 660 | |
5503ac56 EVH |
661 | P9_DPRINTK(P9_DEBUG_MUX, "client %p msize %d\n", client, client->msize); |
662 | m = kzalloc(sizeof(struct p9_conn), GFP_KERNEL); | |
663 | if (!m) | |
664 | return ERR_PTR(-ENOMEM); | |
8a0dc95f | 665 | |
5503ac56 EVH |
666 | INIT_LIST_HEAD(&m->mux_list); |
667 | m->client = client; | |
8a0dc95f | 668 | |
5503ac56 EVH |
669 | INIT_LIST_HEAD(&m->req_list); |
670 | INIT_LIST_HEAD(&m->unsent_req_list); | |
671 | INIT_WORK(&m->rq, p9_read_work); | |
672 | INIT_WORK(&m->wq, p9_write_work); | |
673 | INIT_LIST_HEAD(&m->poll_pending_link); | |
674 | init_poll_funcptr(&m->pt, p9_pollwait); | |
8a0dc95f | 675 | |
5503ac56 EVH |
676 | n = p9_fd_poll(client, &m->pt); |
677 | if (n & POLLIN) { | |
678 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m); | |
679 | set_bit(Rpending, &m->wsched); | |
680 | } | |
8a0dc95f | 681 | |
5503ac56 EVH |
682 | if (n & POLLOUT) { |
683 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m); | |
684 | set_bit(Wpending, &m->wsched); | |
685 | } | |
686 | ||
687 | for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) { | |
688 | if (IS_ERR(m->poll_wait[i].wait_addr)) { | |
689 | p9_mux_poll_stop(m); | |
690 | kfree(m); | |
691 | /* return the error code */ | |
692 | return (void *)m->poll_wait[i].wait_addr; | |
8a0dc95f EVH |
693 | } |
694 | } | |
695 | ||
5503ac56 EVH |
696 | return m; |
697 | } | |
8a0dc95f | 698 | |
5503ac56 EVH |
699 | /** |
700 | * p9_poll_mux - polls a mux and schedules read or write works if necessary | |
701 | * @m: connection to poll | |
702 | * | |
703 | */ | |
704 | ||
705 | static void p9_poll_mux(struct p9_conn *m) | |
706 | { | |
707 | int n; | |
708 | ||
709 | if (m->err < 0) | |
710 | return; | |
711 | ||
712 | n = p9_fd_poll(m->client, NULL); | |
713 | if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) { | |
714 | P9_DPRINTK(P9_DEBUG_MUX, "error mux %p err %d\n", m, n); | |
715 | if (n >= 0) | |
716 | n = -ECONNRESET; | |
717 | p9_conn_cancel(m, n); | |
718 | } | |
719 | ||
720 | if (n & POLLIN) { | |
721 | set_bit(Rpending, &m->wsched); | |
722 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m); | |
723 | if (!test_and_set_bit(Rworksched, &m->wsched)) { | |
8a0dc95f EVH |
724 | P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m); |
725 | queue_work(p9_mux_wq, &m->rq); | |
5503ac56 EVH |
726 | } |
727 | } | |
8a0dc95f | 728 | |
5503ac56 EVH |
729 | if (n & POLLOUT) { |
730 | set_bit(Wpending, &m->wsched); | |
731 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m); | |
732 | if ((m->wsize || !list_empty(&m->unsent_req_list)) | |
733 | && !test_and_set_bit(Wworksched, &m->wsched)) { | |
734 | P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m); | |
735 | queue_work(p9_mux_wq, &m->wq); | |
736 | } | |
737 | } | |
8a0dc95f EVH |
738 | } |
739 | ||
740 | /** | |
741 | * p9_send_request - send 9P request | |
742 | * The function can sleep until the request is scheduled for sending. | |
743 | * The function can be interrupted. Return from the function is not | |
744 | * a guarantee that the request is sent successfully. Can return errors | |
745 | * that can be retrieved by PTR_ERR macros. | |
746 | * | |
747 | * @m: mux data | |
748 | * @tc: request to be sent | |
ee443996 | 749 | * |
8a0dc95f | 750 | */ |
ee443996 | 751 | |
673d62cd | 752 | static struct p9_req_t *p9_send_request(struct p9_conn *m, struct p9_fcall *tc) |
8a0dc95f | 753 | { |
673d62cd | 754 | int tag; |
8a0dc95f | 755 | int n; |
673d62cd | 756 | struct p9_req_t *req; |
8a0dc95f EVH |
757 | |
758 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p task %p tcall %p id %d\n", m, current, | |
759 | tc, tc->id); | |
760 | if (m->err < 0) | |
761 | return ERR_PTR(m->err); | |
762 | ||
673d62cd | 763 | tag = P9_NOTAG; |
ff683452 | 764 | if (tc->id != P9_TVERSION) { |
673d62cd EVH |
765 | tag = p9_idpool_get(m->client->tagpool); |
766 | if (tag < 0) | |
ff683452 | 767 | return ERR_PTR(-ENOMEM); |
62067824 | 768 | } |
8a0dc95f | 769 | |
673d62cd EVH |
770 | p9_set_tag(tc, tag); |
771 | ||
772 | req = p9_tag_alloc(m->client, tag); | |
8a0dc95f EVH |
773 | |
774 | #ifdef CONFIG_NET_9P_DEBUG | |
775 | if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) { | |
776 | char buf[150]; | |
777 | ||
bead27f0 | 778 | p9_printfcall(buf, sizeof(buf), tc, m->client->dotu); |
8a0dc95f EVH |
779 | printk(KERN_NOTICE "<<< %p %s\n", m, buf); |
780 | } | |
781 | #endif | |
782 | ||
673d62cd EVH |
783 | req->tag = tag; |
784 | req->tc = tc; | |
785 | req->rc = NULL; | |
786 | req->t_err = 0; | |
787 | req->status = REQ_STATUS_UNSENT; | |
8a0dc95f | 788 | |
673d62cd | 789 | spin_lock(&m->client->lock); |
8a0dc95f | 790 | list_add_tail(&req->req_list, &m->unsent_req_list); |
673d62cd | 791 | spin_unlock(&m->client->lock); |
8a0dc95f EVH |
792 | |
793 | if (test_and_clear_bit(Wpending, &m->wsched)) | |
794 | n = POLLOUT; | |
795 | else | |
8b81ef58 | 796 | n = p9_fd_poll(m->client, NULL); |
8a0dc95f EVH |
797 | |
798 | if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched)) | |
799 | queue_work(p9_mux_wq, &m->wq); | |
800 | ||
801 | return req; | |
802 | } | |
803 | ||
8a0dc95f | 804 | static int |
673d62cd | 805 | p9_mux_flush_request(struct p9_conn *m, struct p9_req_t *req) |
8a0dc95f EVH |
806 | { |
807 | struct p9_fcall *fc; | |
673d62cd | 808 | struct p9_req_t *rreq, *rptr; |
8a0dc95f EVH |
809 | |
810 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p req %p tag %d\n", m, req, req->tag); | |
811 | ||
812 | /* if a response was received for a request, do nothing */ | |
673d62cd | 813 | if (req->rc || req->t_err) { |
8a0dc95f EVH |
814 | P9_DPRINTK(P9_DEBUG_MUX, |
815 | "mux %p req %p response already received\n", m, req); | |
816 | return 0; | |
817 | } | |
818 | ||
673d62cd | 819 | req->status = REQ_STATUS_FLSH; |
8a0dc95f | 820 | |
673d62cd | 821 | spin_lock(&m->client->lock); |
8a0dc95f EVH |
822 | /* if the request is not sent yet, just remove it from the list */ |
823 | list_for_each_entry_safe(rreq, rptr, &m->unsent_req_list, req_list) { | |
824 | if (rreq->tag == req->tag) { | |
825 | P9_DPRINTK(P9_DEBUG_MUX, | |
826 | "mux %p req %p request is not sent yet\n", m, req); | |
827 | list_del(&rreq->req_list); | |
673d62cd EVH |
828 | req->status = REQ_STATUS_FLSHD; |
829 | spin_unlock(&m->client->lock); | |
830 | p9_conn_rpc_cb(m->client, req); | |
8a0dc95f EVH |
831 | return 0; |
832 | } | |
833 | } | |
673d62cd | 834 | spin_unlock(&m->client->lock); |
8a0dc95f EVH |
835 | |
836 | clear_thread_flag(TIF_SIGPENDING); | |
837 | fc = p9_create_tflush(req->tag); | |
044c7768 | 838 | p9_send_request(m, fc); |
8a0dc95f EVH |
839 | return 1; |
840 | } | |
841 | ||
8a0dc95f EVH |
842 | /** |
843 | * p9_fd_rpc- sends 9P request and waits until a response is available. | |
844 | * The function can be interrupted. | |
8b81ef58 | 845 | * @client: client instance |
8a0dc95f EVH |
846 | * @tc: request to be sent |
847 | * @rc: pointer where a pointer to the response is stored | |
ee443996 | 848 | * |
8a0dc95f | 849 | */ |
ee443996 | 850 | |
8a0dc95f | 851 | int |
8b81ef58 | 852 | p9_fd_rpc(struct p9_client *client, struct p9_fcall *tc, struct p9_fcall **rc) |
8a0dc95f | 853 | { |
8b81ef58 | 854 | struct p9_trans_fd *p = client->trans; |
8a0dc95f EVH |
855 | struct p9_conn *m = p->conn; |
856 | int err, sigpending; | |
857 | unsigned long flags; | |
673d62cd | 858 | struct p9_req_t *req; |
8a0dc95f EVH |
859 | |
860 | if (rc) | |
861 | *rc = NULL; | |
862 | ||
863 | sigpending = 0; | |
864 | if (signal_pending(current)) { | |
865 | sigpending = 1; | |
866 | clear_thread_flag(TIF_SIGPENDING); | |
867 | } | |
868 | ||
044c7768 | 869 | req = p9_send_request(m, tc); |
8a0dc95f EVH |
870 | if (IS_ERR(req)) { |
871 | err = PTR_ERR(req); | |
872 | P9_DPRINTK(P9_DEBUG_MUX, "error %d\n", err); | |
873 | return err; | |
874 | } | |
875 | ||
673d62cd EVH |
876 | err = wait_event_interruptible(*req->wq, req->rc != NULL || |
877 | req->t_err < 0); | |
878 | if (req->t_err < 0) | |
879 | err = req->t_err; | |
8a0dc95f | 880 | |
8b81ef58 | 881 | if (err == -ERESTARTSYS && client->status == Connected |
8a0dc95f EVH |
882 | && m->err == 0) { |
883 | if (p9_mux_flush_request(m, req)) { | |
884 | /* wait until we get response of the flush message */ | |
885 | do { | |
886 | clear_thread_flag(TIF_SIGPENDING); | |
673d62cd EVH |
887 | err = wait_event_interruptible(*req->wq, |
888 | req->rc || req->t_err); | |
889 | } while (!req->rc && !req->t_err && | |
21c00368 EVH |
890 | err == -ERESTARTSYS && |
891 | client->status == Connected && !m->err); | |
8a0dc95f EVH |
892 | |
893 | err = -ERESTARTSYS; | |
894 | } | |
895 | sigpending = 1; | |
896 | } | |
897 | ||
898 | if (sigpending) { | |
899 | spin_lock_irqsave(¤t->sighand->siglock, flags); | |
900 | recalc_sigpending(); | |
901 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); | |
902 | } | |
903 | ||
904 | if (rc) | |
673d62cd | 905 | *rc = req->rc; |
8a0dc95f | 906 | else |
673d62cd | 907 | kfree(req->rc); |
8a0dc95f | 908 | |
673d62cd | 909 | p9_free_req(client, req); |
8a0dc95f EVH |
910 | if (err > 0) |
911 | err = -EIO; | |
912 | ||
913 | return err; | |
914 | } | |
915 | ||
a80d923e | 916 | /** |
bb8ffdfc | 917 | * parse_options - parse mount options into session structure |
a80d923e | 918 | * @options: options string passed from mount |
ee443996 | 919 | * @opts: transport-specific structure to parse options into |
a80d923e | 920 | * |
bb8ffdfc | 921 | * Returns 0 upon success, -ERRNO upon failure |
a80d923e | 922 | */ |
bd238fb4 | 923 | |
bb8ffdfc | 924 | static int parse_opts(char *params, struct p9_fd_opts *opts) |
bd238fb4 | 925 | { |
a80d923e EVH |
926 | char *p; |
927 | substring_t args[MAX_OPT_ARGS]; | |
928 | int option; | |
bb8ffdfc | 929 | char *options; |
a80d923e | 930 | int ret; |
bd238fb4 | 931 | |
a80d923e EVH |
932 | opts->port = P9_PORT; |
933 | opts->rfd = ~0; | |
934 | opts->wfd = ~0; | |
bd238fb4 | 935 | |
bb8ffdfc EVH |
936 | if (!params) |
937 | return 0; | |
938 | ||
939 | options = kstrdup(params, GFP_KERNEL); | |
940 | if (!options) { | |
941 | P9_DPRINTK(P9_DEBUG_ERROR, | |
942 | "failed to allocate copy of option string\n"); | |
943 | return -ENOMEM; | |
944 | } | |
bd238fb4 | 945 | |
a80d923e EVH |
946 | while ((p = strsep(&options, ",")) != NULL) { |
947 | int token; | |
bb8ffdfc | 948 | int r; |
a80d923e EVH |
949 | if (!*p) |
950 | continue; | |
951 | token = match_token(p, tokens, args); | |
bb8ffdfc EVH |
952 | r = match_int(&args[0], &option); |
953 | if (r < 0) { | |
a80d923e EVH |
954 | P9_DPRINTK(P9_DEBUG_ERROR, |
955 | "integer field, but no integer?\n"); | |
bb8ffdfc | 956 | ret = r; |
a80d923e EVH |
957 | continue; |
958 | } | |
959 | switch (token) { | |
960 | case Opt_port: | |
961 | opts->port = option; | |
962 | break; | |
963 | case Opt_rfdno: | |
964 | opts->rfd = option; | |
965 | break; | |
966 | case Opt_wfdno: | |
967 | opts->wfd = option; | |
968 | break; | |
969 | default: | |
970 | continue; | |
971 | } | |
bd238fb4 | 972 | } |
bb8ffdfc EVH |
973 | kfree(options); |
974 | return 0; | |
bd238fb4 | 975 | } |
bd238fb4 | 976 | |
8b81ef58 | 977 | static int p9_fd_open(struct p9_client *client, int rfd, int wfd) |
bd238fb4 | 978 | { |
a80d923e EVH |
979 | struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd), |
980 | GFP_KERNEL); | |
981 | if (!ts) | |
982 | return -ENOMEM; | |
bd238fb4 | 983 | |
a80d923e EVH |
984 | ts->rd = fget(rfd); |
985 | ts->wr = fget(wfd); | |
986 | if (!ts->rd || !ts->wr) { | |
987 | if (ts->rd) | |
988 | fput(ts->rd); | |
989 | if (ts->wr) | |
990 | fput(ts->wr); | |
991 | kfree(ts); | |
992 | return -EIO; | |
bd238fb4 LI |
993 | } |
994 | ||
8b81ef58 EVH |
995 | client->trans = ts; |
996 | client->status = Connected; | |
bd238fb4 | 997 | |
a80d923e | 998 | return 0; |
bd238fb4 | 999 | } |
bd238fb4 | 1000 | |
8b81ef58 | 1001 | static int p9_socket_open(struct p9_client *client, struct socket *csocket) |
bd238fb4 LI |
1002 | { |
1003 | int fd, ret; | |
1004 | ||
1005 | csocket->sk->sk_allocation = GFP_NOIO; | |
a677a039 | 1006 | fd = sock_map_fd(csocket, 0); |
bd238fb4 LI |
1007 | if (fd < 0) { |
1008 | P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to map fd\n"); | |
1009 | return fd; | |
1010 | } | |
1011 | ||
8b81ef58 | 1012 | ret = p9_fd_open(client, fd, fd); |
bd238fb4 LI |
1013 | if (ret < 0) { |
1014 | P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to open fd\n"); | |
1015 | sockfd_put(csocket); | |
1016 | return ret; | |
1017 | } | |
1018 | ||
8b81ef58 | 1019 | ((struct p9_trans_fd *)client->trans)->rd->f_flags |= O_NONBLOCK; |
bd238fb4 LI |
1020 | |
1021 | return 0; | |
1022 | } | |
1023 | ||
bd238fb4 | 1024 | /** |
5503ac56 EVH |
1025 | * p9_mux_destroy - cancels all pending requests and frees mux resources |
1026 | * @m: mux to destroy | |
bd238fb4 LI |
1027 | * |
1028 | */ | |
ee443996 | 1029 | |
5503ac56 | 1030 | static void p9_conn_destroy(struct p9_conn *m) |
bd238fb4 | 1031 | { |
5503ac56 EVH |
1032 | P9_DPRINTK(P9_DEBUG_MUX, "mux %p prev %p next %p\n", m, |
1033 | m->mux_list.prev, m->mux_list.next); | |
bd238fb4 | 1034 | |
5503ac56 EVH |
1035 | p9_mux_poll_stop(m); |
1036 | cancel_work_sync(&m->rq); | |
1037 | cancel_work_sync(&m->wq); | |
bd238fb4 | 1038 | |
5503ac56 | 1039 | p9_conn_cancel(m, -ECONNRESET); |
bd238fb4 | 1040 | |
5503ac56 | 1041 | m->client = NULL; |
5503ac56 | 1042 | kfree(m); |
bd238fb4 LI |
1043 | } |
1044 | ||
1045 | /** | |
8b81ef58 EVH |
1046 | * p9_fd_close - shutdown file descriptor transport |
1047 | * @client: client instance | |
bd238fb4 LI |
1048 | * |
1049 | */ | |
ee443996 | 1050 | |
8b81ef58 | 1051 | static void p9_fd_close(struct p9_client *client) |
bd238fb4 LI |
1052 | { |
1053 | struct p9_trans_fd *ts; | |
1054 | ||
8b81ef58 | 1055 | if (!client) |
bd238fb4 LI |
1056 | return; |
1057 | ||
8b81ef58 | 1058 | ts = client->trans; |
bd238fb4 LI |
1059 | if (!ts) |
1060 | return; | |
1061 | ||
8b81ef58 EVH |
1062 | client->status = Disconnected; |
1063 | ||
8a0dc95f EVH |
1064 | p9_conn_destroy(ts->conn); |
1065 | ||
bd238fb4 LI |
1066 | if (ts->rd) |
1067 | fput(ts->rd); | |
1068 | if (ts->wr) | |
1069 | fput(ts->wr); | |
8b81ef58 | 1070 | |
bd238fb4 LI |
1071 | kfree(ts); |
1072 | } | |
1073 | ||
887b3ece EVH |
1074 | /* |
1075 | * stolen from NFS - maybe should be made a generic function? | |
1076 | */ | |
1077 | static inline int valid_ipaddr4(const char *buf) | |
1078 | { | |
1079 | int rc, count, in[4]; | |
1080 | ||
1081 | rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]); | |
1082 | if (rc != 4) | |
1083 | return -EINVAL; | |
1084 | for (count = 0; count < 4; count++) { | |
1085 | if (in[count] > 255) | |
1086 | return -EINVAL; | |
1087 | } | |
1088 | return 0; | |
1089 | } | |
1090 | ||
8b81ef58 EVH |
1091 | static int |
1092 | p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args) | |
a80d923e EVH |
1093 | { |
1094 | int err; | |
a80d923e EVH |
1095 | struct socket *csocket; |
1096 | struct sockaddr_in sin_server; | |
1097 | struct p9_fd_opts opts; | |
8b81ef58 | 1098 | struct p9_trans_fd *p = NULL; /* this gets allocated in p9_fd_open */ |
a80d923e | 1099 | |
bb8ffdfc EVH |
1100 | err = parse_opts(args, &opts); |
1101 | if (err < 0) | |
8b81ef58 | 1102 | return err; |
a80d923e | 1103 | |
887b3ece | 1104 | if (valid_ipaddr4(addr) < 0) |
8b81ef58 | 1105 | return -EINVAL; |
887b3ece | 1106 | |
a80d923e | 1107 | csocket = NULL; |
a80d923e EVH |
1108 | |
1109 | sin_server.sin_family = AF_INET; | |
1110 | sin_server.sin_addr.s_addr = in_aton(addr); | |
1111 | sin_server.sin_port = htons(opts.port); | |
1112 | sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket); | |
1113 | ||
1114 | if (!csocket) { | |
1115 | P9_EPRINTK(KERN_ERR, "p9_trans_tcp: problem creating socket\n"); | |
1116 | err = -EIO; | |
1117 | goto error; | |
1118 | } | |
1119 | ||
1120 | err = csocket->ops->connect(csocket, | |
1121 | (struct sockaddr *)&sin_server, | |
1122 | sizeof(struct sockaddr_in), 0); | |
1123 | if (err < 0) { | |
1124 | P9_EPRINTK(KERN_ERR, | |
1125 | "p9_trans_tcp: problem connecting socket to %s\n", | |
1126 | addr); | |
1127 | goto error; | |
1128 | } | |
1129 | ||
8b81ef58 | 1130 | err = p9_socket_open(client, csocket); |
a80d923e EVH |
1131 | if (err < 0) |
1132 | goto error; | |
1133 | ||
8b81ef58 EVH |
1134 | p = (struct p9_trans_fd *) client->trans; |
1135 | p->conn = p9_conn_create(client); | |
8a0dc95f EVH |
1136 | if (IS_ERR(p->conn)) { |
1137 | err = PTR_ERR(p->conn); | |
1138 | p->conn = NULL; | |
1139 | goto error; | |
1140 | } | |
1141 | ||
8b81ef58 | 1142 | return 0; |
a80d923e EVH |
1143 | |
1144 | error: | |
1145 | if (csocket) | |
1146 | sock_release(csocket); | |
1147 | ||
8b81ef58 EVH |
1148 | kfree(p); |
1149 | ||
1150 | return err; | |
a80d923e EVH |
1151 | } |
1152 | ||
8b81ef58 EVH |
1153 | static int |
1154 | p9_fd_create_unix(struct p9_client *client, const char *addr, char *args) | |
a80d923e EVH |
1155 | { |
1156 | int err; | |
1157 | struct socket *csocket; | |
1158 | struct sockaddr_un sun_server; | |
8b81ef58 | 1159 | struct p9_trans_fd *p = NULL; /* this gets allocated in p9_fd_open */ |
a80d923e EVH |
1160 | |
1161 | csocket = NULL; | |
a80d923e EVH |
1162 | |
1163 | if (strlen(addr) > UNIX_PATH_MAX) { | |
1164 | P9_EPRINTK(KERN_ERR, "p9_trans_unix: address too long: %s\n", | |
1165 | addr); | |
1166 | err = -ENAMETOOLONG; | |
1167 | goto error; | |
1168 | } | |
1169 | ||
1170 | sun_server.sun_family = PF_UNIX; | |
1171 | strcpy(sun_server.sun_path, addr); | |
1172 | sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket); | |
1173 | err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server, | |
1174 | sizeof(struct sockaddr_un) - 1, 0); | |
1175 | if (err < 0) { | |
1176 | P9_EPRINTK(KERN_ERR, | |
1177 | "p9_trans_unix: problem connecting socket: %s: %d\n", | |
1178 | addr, err); | |
1179 | goto error; | |
1180 | } | |
1181 | ||
8b81ef58 | 1182 | err = p9_socket_open(client, csocket); |
a80d923e EVH |
1183 | if (err < 0) |
1184 | goto error; | |
1185 | ||
8b81ef58 EVH |
1186 | p = (struct p9_trans_fd *) client->trans; |
1187 | p->conn = p9_conn_create(client); | |
8a0dc95f EVH |
1188 | if (IS_ERR(p->conn)) { |
1189 | err = PTR_ERR(p->conn); | |
1190 | p->conn = NULL; | |
1191 | goto error; | |
1192 | } | |
1193 | ||
8b81ef58 | 1194 | return 0; |
a80d923e EVH |
1195 | |
1196 | error: | |
1197 | if (csocket) | |
1198 | sock_release(csocket); | |
1199 | ||
8b81ef58 EVH |
1200 | kfree(p); |
1201 | return err; | |
a80d923e EVH |
1202 | } |
1203 | ||
8b81ef58 EVH |
1204 | static int |
1205 | p9_fd_create(struct p9_client *client, const char *addr, char *args) | |
a80d923e EVH |
1206 | { |
1207 | int err; | |
a80d923e | 1208 | struct p9_fd_opts opts; |
8b81ef58 | 1209 | struct p9_trans_fd *p = NULL; /* this get allocated in p9_fd_open */ |
a80d923e EVH |
1210 | |
1211 | parse_opts(args, &opts); | |
1212 | ||
1213 | if (opts.rfd == ~0 || opts.wfd == ~0) { | |
1214 | printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n"); | |
8b81ef58 | 1215 | return -ENOPROTOOPT; |
a80d923e EVH |
1216 | } |
1217 | ||
8b81ef58 | 1218 | err = p9_fd_open(client, opts.rfd, opts.wfd); |
a80d923e EVH |
1219 | if (err < 0) |
1220 | goto error; | |
1221 | ||
8b81ef58 EVH |
1222 | p = (struct p9_trans_fd *) client->trans; |
1223 | p->conn = p9_conn_create(client); | |
8a0dc95f EVH |
1224 | if (IS_ERR(p->conn)) { |
1225 | err = PTR_ERR(p->conn); | |
1226 | p->conn = NULL; | |
1227 | goto error; | |
1228 | } | |
1229 | ||
8b81ef58 | 1230 | return 0; |
a80d923e EVH |
1231 | |
1232 | error: | |
8b81ef58 EVH |
1233 | kfree(p); |
1234 | return err; | |
a80d923e EVH |
1235 | } |
1236 | ||
1237 | static struct p9_trans_module p9_tcp_trans = { | |
1238 | .name = "tcp", | |
1239 | .maxsize = MAX_SOCK_BUF, | |
1240 | .def = 1, | |
8b81ef58 EVH |
1241 | .create = p9_fd_create_tcp, |
1242 | .close = p9_fd_close, | |
1243 | .rpc = p9_fd_rpc, | |
72029fe8 | 1244 | .owner = THIS_MODULE, |
a80d923e EVH |
1245 | }; |
1246 | ||
1247 | static struct p9_trans_module p9_unix_trans = { | |
1248 | .name = "unix", | |
1249 | .maxsize = MAX_SOCK_BUF, | |
1250 | .def = 0, | |
8b81ef58 EVH |
1251 | .create = p9_fd_create_unix, |
1252 | .close = p9_fd_close, | |
1253 | .rpc = p9_fd_rpc, | |
72029fe8 | 1254 | .owner = THIS_MODULE, |
a80d923e EVH |
1255 | }; |
1256 | ||
1257 | static struct p9_trans_module p9_fd_trans = { | |
1258 | .name = "fd", | |
1259 | .maxsize = MAX_SOCK_BUF, | |
1260 | .def = 0, | |
8b81ef58 EVH |
1261 | .create = p9_fd_create, |
1262 | .close = p9_fd_close, | |
1263 | .rpc = p9_fd_rpc, | |
72029fe8 | 1264 | .owner = THIS_MODULE, |
a80d923e EVH |
1265 | }; |
1266 | ||
5503ac56 EVH |
1267 | /** |
1268 | * p9_poll_proc - poll worker thread | |
1269 | * @a: thread state and arguments | |
1270 | * | |
1271 | * polls all v9fs transports for new events and queues the appropriate | |
1272 | * work to the work queue | |
1273 | * | |
1274 | */ | |
1275 | ||
1276 | static int p9_poll_proc(void *a) | |
1277 | { | |
1278 | unsigned long flags; | |
1279 | ||
1280 | P9_DPRINTK(P9_DEBUG_MUX, "start %p\n", current); | |
1281 | repeat: | |
1282 | spin_lock_irqsave(&p9_poll_lock, flags); | |
1283 | while (!list_empty(&p9_poll_pending_list)) { | |
1284 | struct p9_conn *conn = list_first_entry(&p9_poll_pending_list, | |
1285 | struct p9_conn, | |
1286 | poll_pending_link); | |
1287 | list_del_init(&conn->poll_pending_link); | |
1288 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
1289 | ||
1290 | p9_poll_mux(conn); | |
1291 | ||
1292 | spin_lock_irqsave(&p9_poll_lock, flags); | |
1293 | } | |
1294 | spin_unlock_irqrestore(&p9_poll_lock, flags); | |
1295 | ||
1296 | set_current_state(TASK_INTERRUPTIBLE); | |
1297 | if (list_empty(&p9_poll_pending_list)) { | |
1298 | P9_DPRINTK(P9_DEBUG_MUX, "sleeping...\n"); | |
1299 | schedule(); | |
1300 | } | |
1301 | __set_current_state(TASK_RUNNING); | |
1302 | ||
1303 | if (!kthread_should_stop()) | |
1304 | goto repeat; | |
1305 | ||
1306 | P9_DPRINTK(P9_DEBUG_MUX, "finish\n"); | |
1307 | return 0; | |
1308 | } | |
1309 | ||
887b3ece | 1310 | int p9_trans_fd_init(void) |
a80d923e | 1311 | { |
206ca50d TH |
1312 | p9_mux_wq = create_workqueue("v9fs"); |
1313 | if (!p9_mux_wq) { | |
1314 | printk(KERN_WARNING "v9fs: mux: creating workqueue failed\n"); | |
1315 | return -ENOMEM; | |
8a0dc95f EVH |
1316 | } |
1317 | ||
992b3f1d TH |
1318 | p9_poll_task = kthread_run(p9_poll_proc, NULL, "v9fs-poll"); |
1319 | if (IS_ERR(p9_poll_task)) { | |
1320 | destroy_workqueue(p9_mux_wq); | |
1321 | printk(KERN_WARNING "v9fs: mux: creating poll task failed\n"); | |
1322 | return PTR_ERR(p9_poll_task); | |
1323 | } | |
1324 | ||
a80d923e EVH |
1325 | v9fs_register_trans(&p9_tcp_trans); |
1326 | v9fs_register_trans(&p9_unix_trans); | |
1327 | v9fs_register_trans(&p9_fd_trans); | |
1328 | ||
3387b804 | 1329 | return 0; |
a80d923e | 1330 | } |
72029fe8 TH |
1331 | |
1332 | void p9_trans_fd_exit(void) | |
1333 | { | |
992b3f1d | 1334 | kthread_stop(p9_poll_task); |
72029fe8 TH |
1335 | v9fs_unregister_trans(&p9_tcp_trans); |
1336 | v9fs_unregister_trans(&p9_unix_trans); | |
1337 | v9fs_unregister_trans(&p9_fd_trans); | |
206ca50d TH |
1338 | |
1339 | destroy_workqueue(p9_mux_wq); | |
72029fe8 | 1340 | } |