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Merge branch 'sched/urgent'
[linux-2.6/x86.git] / net / 9p / trans_fd.c
blobfdfdb5747f63b6492fc23eafa000dcd7d93c9c5b
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>
8 * Copyright (C) 2004-2008 by Eric Van Hensbergen <ericvh@gmail.com>
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>
32 #include <linux/kthread.h>
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>
40 #include <linux/parser.h>
41 #include <linux/slab.h>
42 #include <net/9p/9p.h>
43 #include <net/9p/client.h>
44 #include <net/9p/transport.h>
45
46 #include <linux/syscalls.h> /* killme */
47
48 #define P9_PORT 564
49 #define MAX_SOCK_BUF (64*1024)
50 #define MAXPOLLWADDR 2
51
52 /**
53 * struct p9_fd_opts - per-transport options
54 * @rfd: file descriptor for reading (trans=fd)
55 * @wfd: file descriptor for writing (trans=fd)
56 * @port: port to connect to (trans=tcp)
57 *
58 */
59
60 struct p9_fd_opts {
61 int rfd;
62 int wfd;
63 u16 port;
64 };
65
66 /**
67 * struct p9_trans_fd - transport state
68 * @rd: reference to file to read from
69 * @wr: reference of file to write to
70 * @conn: connection state reference
71 *
72 */
73
74 struct p9_trans_fd {
75 struct file *rd;
76 struct file *wr;
77 struct p9_conn *conn;
78 };
79
80 /*
81 * Option Parsing (code inspired by NFS code)
82 * - a little lazy - parse all fd-transport options
83 */
84
85 enum {
86 /* Options that take integer arguments */
87 Opt_port, Opt_rfdno, Opt_wfdno, Opt_err,
88 };
89
90 static const match_table_t tokens = {
91 {Opt_port, "port=%u"},
92 {Opt_rfdno, "rfdno=%u"},
93 {Opt_wfdno, "wfdno=%u"},
94 {Opt_err, NULL},
95 };
96
97 enum {
98 Rworksched = 1, /* read work scheduled or running */
99 Rpending = 2, /* can read */
100 Wworksched = 4, /* write work scheduled or running */
101 Wpending = 8, /* can write */
102 };
103
104 struct p9_poll_wait {
105 struct p9_conn *conn;
106 wait_queue_t wait;
107 wait_queue_head_t *wait_addr;
108 };
109
110 /**
111 * struct p9_conn - fd mux connection state information
112 * @mux_list: list link for mux to manage multiple connections (?)
113 * @client: reference to client instance for this connection
114 * @err: error state
115 * @req_list: accounting for requests which have been sent
116 * @unsent_req_list: accounting for requests that haven't been sent
117 * @req: current request being processed (if any)
118 * @tmp_buf: temporary buffer to read in header
119 * @rsize: amount to read for current frame
120 * @rpos: read position in current frame
121 * @rbuf: current read buffer
122 * @wpos: write position for current frame
123 * @wsize: amount of data to write for current frame
124 * @wbuf: current write buffer
125 * @poll_pending_link: pending links to be polled per conn
126 * @poll_wait: array of wait_q's for various worker threads
127 * @pt: poll state
128 * @rq: current read work
129 * @wq: current write work
130 * @wsched: ????
131 *
132 */
133
134 struct p9_conn {
135 struct list_head mux_list;
136 struct p9_client *client;
137 int err;
138 struct list_head req_list;
139 struct list_head unsent_req_list;
140 struct p9_req_t *req;
141 char tmp_buf[7];
142 int rsize;
143 int rpos;
144 char *rbuf;
145 int wpos;
146 int wsize;
147 char *wbuf;
148 struct list_head poll_pending_link;
149 struct p9_poll_wait poll_wait[MAXPOLLWADDR];
150 poll_table pt;
151 struct work_struct rq;
152 struct work_struct wq;
153 unsigned long wsched;
154 };
155
156 static void p9_poll_workfn(struct work_struct *work);
157
158 static DEFINE_SPINLOCK(p9_poll_lock);
159 static LIST_HEAD(p9_poll_pending_list);
160 static DECLARE_WORK(p9_poll_work, p9_poll_workfn);
161
162 static void p9_mux_poll_stop(struct p9_conn *m)
163 {
164 unsigned long flags;
165 int i;
166
167 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
168 struct p9_poll_wait *pwait = &m->poll_wait[i];
169
170 if (pwait->wait_addr) {
171 remove_wait_queue(pwait->wait_addr, &pwait->wait);
172 pwait->wait_addr = NULL;
173 }
174 }
175
176 spin_lock_irqsave(&p9_poll_lock, flags);
177 list_del_init(&m->poll_pending_link);
178 spin_unlock_irqrestore(&p9_poll_lock, flags);
179 }
180
181 /**
182 * p9_conn_cancel - cancel all pending requests with error
183 * @m: mux data
184 * @err: error code
185 *
186 */
187
188 static void p9_conn_cancel(struct p9_conn *m, int err)
189 {
190 struct p9_req_t *req, *rtmp;
191 unsigned long flags;
192 LIST_HEAD(cancel_list);
193
194 P9_DPRINTK(P9_DEBUG_ERROR, "mux %p err %d\n", m, err);
195
196 spin_lock_irqsave(&m->client->lock, flags);
197
198 if (m->err) {
199 spin_unlock_irqrestore(&m->client->lock, flags);
200 return;
201 }
202
203 m->err = err;
204
205 list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) {
206 req->status = REQ_STATUS_ERROR;
207 if (!req->t_err)
208 req->t_err = err;
209 list_move(&req->req_list, &cancel_list);
210 }
211 list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) {
212 req->status = REQ_STATUS_ERROR;
213 if (!req->t_err)
214 req->t_err = err;
215 list_move(&req->req_list, &cancel_list);
216 }
217 spin_unlock_irqrestore(&m->client->lock, flags);
218
219 list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) {
220 P9_DPRINTK(P9_DEBUG_ERROR, "call back req %p\n", req);
221 list_del(&req->req_list);
222 p9_client_cb(m->client, req);
223 }
224 }
225
226 static int
227 p9_fd_poll(struct p9_client *client, struct poll_table_struct *pt)
228 {
229 int ret, n;
230 struct p9_trans_fd *ts = NULL;
231
232 if (client && client->status == Connected)
233 ts = client->trans;
234
235 if (!ts)
236 return -EREMOTEIO;
237
238 if (!ts->rd->f_op || !ts->rd->f_op->poll)
239 return -EIO;
240
241 if (!ts->wr->f_op || !ts->wr->f_op->poll)
242 return -EIO;
243
244 ret = ts->rd->f_op->poll(ts->rd, pt);
245 if (ret < 0)
246 return ret;
247
248 if (ts->rd != ts->wr) {
249 n = ts->wr->f_op->poll(ts->wr, pt);
250 if (n < 0)
251 return n;
252 ret = (ret & ~POLLOUT) | (n & ~POLLIN);
253 }
254
255 return ret;
256 }
257
258 /**
259 * p9_fd_read- read from a fd
260 * @client: client instance
261 * @v: buffer to receive data into
262 * @len: size of receive buffer
263 *
264 */
265
266 static int p9_fd_read(struct p9_client *client, void *v, int len)
267 {
268 int ret;
269 struct p9_trans_fd *ts = NULL;
270
271 if (client && client->status != Disconnected)
272 ts = client->trans;
273
274 if (!ts)
275 return -EREMOTEIO;
276
277 if (!(ts->rd->f_flags & O_NONBLOCK))
278 P9_DPRINTK(P9_DEBUG_ERROR, "blocking read ...\n");
279
280 ret = kernel_read(ts->rd, ts->rd->f_pos, v, len);
281 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
282 client->status = Disconnected;
283 return ret;
284 }
285
286 /**
287 * p9_read_work - called when there is some data to be read from a transport
288 * @work: container of work to be done
289 *
290 */
291
292 static void p9_read_work(struct work_struct *work)
293 {
294 int n, err;
295 struct p9_conn *m;
296
297 m = container_of(work, struct p9_conn, rq);
298
299 if (m->err < 0)
300 return;
301
302 P9_DPRINTK(P9_DEBUG_TRANS, "start mux %p pos %d\n", m, m->rpos);
303
304 if (!m->rbuf) {
305 m->rbuf = m->tmp_buf;
306 m->rpos = 0;
307 m->rsize = 7; /* start by reading header */
308 }
309
310 clear_bit(Rpending, &m->wsched);
311 P9_DPRINTK(P9_DEBUG_TRANS, "read mux %p pos %d size: %d = %d\n", m,
312 m->rpos, m->rsize, m->rsize-m->rpos);
313 err = p9_fd_read(m->client, m->rbuf + m->rpos,
314 m->rsize - m->rpos);
315 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p got %d bytes\n", m, err);
316 if (err == -EAGAIN) {
317 clear_bit(Rworksched, &m->wsched);
318 return;
319 }
320
321 if (err <= 0)
322 goto error;
323
324 m->rpos += err;
325
326 if ((!m->req) && (m->rpos == m->rsize)) { /* header read in */
327 u16 tag;
328 P9_DPRINTK(P9_DEBUG_TRANS, "got new header\n");
329
330 n = le32_to_cpu(*(__le32 *) m->rbuf); /* read packet size */
331 if (n >= m->client->msize) {
332 P9_DPRINTK(P9_DEBUG_ERROR,
333 "requested packet size too big: %d\n", n);
334 err = -EIO;
335 goto error;
336 }
337
338 tag = le16_to_cpu(*(__le16 *) (m->rbuf+5)); /* read tag */
339 P9_DPRINTK(P9_DEBUG_TRANS,
340 "mux %p pkt: size: %d bytes tag: %d\n", m, n, tag);
341
342 m->req = p9_tag_lookup(m->client, tag);
343 if (!m->req || (m->req->status != REQ_STATUS_SENT &&
344 m->req->status != REQ_STATUS_FLSH)) {
345 P9_DPRINTK(P9_DEBUG_ERROR, "Unexpected packet tag %d\n",
346 tag);
347 err = -EIO;
348 goto error;
349 }
350
351 if (m->req->rc == NULL) {
352 m->req->rc = kmalloc(sizeof(struct p9_fcall) +
353 m->client->msize, GFP_NOFS);
354 if (!m->req->rc) {
355 m->req = NULL;
356 err = -ENOMEM;
357 goto error;
358 }
359 }
360 m->rbuf = (char *)m->req->rc + sizeof(struct p9_fcall);
361 memcpy(m->rbuf, m->tmp_buf, m->rsize);
362 m->rsize = n;
363 }
364
365 /* not an else because some packets (like clunk) have no payload */
366 if ((m->req) && (m->rpos == m->rsize)) { /* packet is read in */
367 P9_DPRINTK(P9_DEBUG_TRANS, "got new packet\n");
368 spin_lock(&m->client->lock);
369 if (m->req->status != REQ_STATUS_ERROR)
370 m->req->status = REQ_STATUS_RCVD;
371 list_del(&m->req->req_list);
372 spin_unlock(&m->client->lock);
373 p9_client_cb(m->client, m->req);
374 m->rbuf = NULL;
375 m->rpos = 0;
376 m->rsize = 0;
377 m->req = NULL;
378 }
379
380 if (!list_empty(&m->req_list)) {
381 if (test_and_clear_bit(Rpending, &m->wsched))
382 n = POLLIN;
383 else
384 n = p9_fd_poll(m->client, NULL);
385
386 if (n & POLLIN) {
387 P9_DPRINTK(P9_DEBUG_TRANS, "sched read work %p\n", m);
388 schedule_work(&m->rq);
389 } else
390 clear_bit(Rworksched, &m->wsched);
391 } else
392 clear_bit(Rworksched, &m->wsched);
393
394 return;
395 error:
396 p9_conn_cancel(m, err);
397 clear_bit(Rworksched, &m->wsched);
398 }
399
400 /**
401 * p9_fd_write - write to a socket
402 * @client: client instance
403 * @v: buffer to send data from
404 * @len: size of send buffer
405 *
406 */
407
408 static int p9_fd_write(struct p9_client *client, void *v, int len)
409 {
410 int ret;
411 mm_segment_t oldfs;
412 struct p9_trans_fd *ts = NULL;
413
414 if (client && client->status != Disconnected)
415 ts = client->trans;
416
417 if (!ts)
418 return -EREMOTEIO;
419
420 if (!(ts->wr->f_flags & O_NONBLOCK))
421 P9_DPRINTK(P9_DEBUG_ERROR, "blocking write ...\n");
422
423 oldfs = get_fs();
424 set_fs(get_ds());
425 /* The cast to a user pointer is valid due to the set_fs() */
426 ret = vfs_write(ts->wr, (__force void __user *)v, len, &ts->wr->f_pos);
427 set_fs(oldfs);
428
429 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
430 client->status = Disconnected;
431 return ret;
432 }
433
434 /**
435 * p9_write_work - called when a transport can send some data
436 * @work: container for work to be done
437 *
438 */
439
440 static void p9_write_work(struct work_struct *work)
441 {
442 int n, err;
443 struct p9_conn *m;
444 struct p9_req_t *req;
445
446 m = container_of(work, struct p9_conn, wq);
447
448 if (m->err < 0) {
449 clear_bit(Wworksched, &m->wsched);
450 return;
451 }
452
453 if (!m->wsize) {
454 if (list_empty(&m->unsent_req_list)) {
455 clear_bit(Wworksched, &m->wsched);
456 return;
457 }
458
459 spin_lock(&m->client->lock);
460 req = list_entry(m->unsent_req_list.next, struct p9_req_t,
461 req_list);
462 req->status = REQ_STATUS_SENT;
463 P9_DPRINTK(P9_DEBUG_TRANS, "move req %p\n", req);
464 list_move_tail(&req->req_list, &m->req_list);
465
466 m->wbuf = req->tc->sdata;
467 m->wsize = req->tc->size;
468 m->wpos = 0;
469 spin_unlock(&m->client->lock);
470 }
471
472 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p pos %d size %d\n", m, m->wpos,
473 m->wsize);
474 clear_bit(Wpending, &m->wsched);
475 err = p9_fd_write(m->client, m->wbuf + m->wpos, m->wsize - m->wpos);
476 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p sent %d bytes\n", m, err);
477 if (err == -EAGAIN) {
478 clear_bit(Wworksched, &m->wsched);
479 return;
480 }
481
482 if (err < 0)
483 goto error;
484 else if (err == 0) {
485 err = -EREMOTEIO;
486 goto error;
487 }
488
489 m->wpos += err;
490 if (m->wpos == m->wsize)
491 m->wpos = m->wsize = 0;
492
493 if (m->wsize == 0 && !list_empty(&m->unsent_req_list)) {
494 if (test_and_clear_bit(Wpending, &m->wsched))
495 n = POLLOUT;
496 else
497 n = p9_fd_poll(m->client, NULL);
498
499 if (n & POLLOUT) {
500 P9_DPRINTK(P9_DEBUG_TRANS, "sched write work %p\n", m);
501 schedule_work(&m->wq);
502 } else
503 clear_bit(Wworksched, &m->wsched);
504 } else
505 clear_bit(Wworksched, &m->wsched);
506
507 return;
508
509 error:
510 p9_conn_cancel(m, err);
511 clear_bit(Wworksched, &m->wsched);
512 }
513
514 static int p9_pollwake(wait_queue_t *wait, unsigned mode, int sync, void *key)
515 {
516 struct p9_poll_wait *pwait =
517 container_of(wait, struct p9_poll_wait, wait);
518 struct p9_conn *m = pwait->conn;
519 unsigned long flags;
520
521 spin_lock_irqsave(&p9_poll_lock, flags);
522 if (list_empty(&m->poll_pending_link))
523 list_add_tail(&m->poll_pending_link, &p9_poll_pending_list);
524 spin_unlock_irqrestore(&p9_poll_lock, flags);
525
526 schedule_work(&p9_poll_work);
527 return 1;
528 }
529
530 /**
531 * p9_pollwait - add poll task to the wait queue
532 * @filp: file pointer being polled
533 * @wait_address: wait_q to block on
534 * @p: poll state
535 *
536 * called by files poll operation to add v9fs-poll task to files wait queue
537 */
538
539 static void
540 p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p)
541 {
542 struct p9_conn *m = container_of(p, struct p9_conn, pt);
543 struct p9_poll_wait *pwait = NULL;
544 int i;
545
546 for (i = 0; i < ARRAY_SIZE(m->poll_wait); i++) {
547 if (m->poll_wait[i].wait_addr == NULL) {
548 pwait = &m->poll_wait[i];
549 break;
550 }
551 }
552
553 if (!pwait) {
554 P9_DPRINTK(P9_DEBUG_ERROR, "not enough wait_address slots\n");
555 return;
556 }
557
558 pwait->conn = m;
559 pwait->wait_addr = wait_address;
560 init_waitqueue_func_entry(&pwait->wait, p9_pollwake);
561 add_wait_queue(wait_address, &pwait->wait);
562 }
563
564 /**
565 * p9_conn_create - allocate and initialize the per-session mux data
566 * @client: client instance
567 *
568 * Note: Creates the polling task if this is the first session.
569 */
570
571 static struct p9_conn *p9_conn_create(struct p9_client *client)
572 {
573 int n;
574 struct p9_conn *m;
575
576 P9_DPRINTK(P9_DEBUG_TRANS, "client %p msize %d\n", client,
577 client->msize);
578 m = kzalloc(sizeof(struct p9_conn), GFP_KERNEL);
579 if (!m)
580 return ERR_PTR(-ENOMEM);
581
582 INIT_LIST_HEAD(&m->mux_list);
583 m->client = client;
584
585 INIT_LIST_HEAD(&m->req_list);
586 INIT_LIST_HEAD(&m->unsent_req_list);
587 INIT_WORK(&m->rq, p9_read_work);
588 INIT_WORK(&m->wq, p9_write_work);
589 INIT_LIST_HEAD(&m->poll_pending_link);
590 init_poll_funcptr(&m->pt, p9_pollwait);
591
592 n = p9_fd_poll(client, &m->pt);
593 if (n & POLLIN) {
594 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p can read\n", m);
595 set_bit(Rpending, &m->wsched);
596 }
597
598 if (n & POLLOUT) {
599 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p can write\n", m);
600 set_bit(Wpending, &m->wsched);
601 }
602
603 return m;
604 }
605
606 /**
607 * p9_poll_mux - polls a mux and schedules read or write works if necessary
608 * @m: connection to poll
609 *
610 */
611
612 static void p9_poll_mux(struct p9_conn *m)
613 {
614 int n;
615
616 if (m->err < 0)
617 return;
618
619 n = p9_fd_poll(m->client, NULL);
620 if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) {
621 P9_DPRINTK(P9_DEBUG_TRANS, "error mux %p err %d\n", m, n);
622 if (n >= 0)
623 n = -ECONNRESET;
624 p9_conn_cancel(m, n);
625 }
626
627 if (n & POLLIN) {
628 set_bit(Rpending, &m->wsched);
629 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p can read\n", m);
630 if (!test_and_set_bit(Rworksched, &m->wsched)) {
631 P9_DPRINTK(P9_DEBUG_TRANS, "sched read work %p\n", m);
632 schedule_work(&m->rq);
633 }
634 }
635
636 if (n & POLLOUT) {
637 set_bit(Wpending, &m->wsched);
638 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p can write\n", m);
639 if ((m->wsize || !list_empty(&m->unsent_req_list)) &&
640 !test_and_set_bit(Wworksched, &m->wsched)) {
641 P9_DPRINTK(P9_DEBUG_TRANS, "sched write work %p\n", m);
642 schedule_work(&m->wq);
643 }
644 }
645 }
646
647 /**
648 * p9_fd_request - send 9P request
649 * The function can sleep until the request is scheduled for sending.
650 * The function can be interrupted. Return from the function is not
651 * a guarantee that the request is sent successfully.
652 *
653 * @client: client instance
654 * @req: request to be sent
655 *
656 */
657
658 static int p9_fd_request(struct p9_client *client, struct p9_req_t *req)
659 {
660 int n;
661 struct p9_trans_fd *ts = client->trans;
662 struct p9_conn *m = ts->conn;
663
664 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p task %p tcall %p id %d\n", m,
665 current, req->tc, req->tc->id);
666 if (m->err < 0)
667 return m->err;
668
669 spin_lock(&client->lock);
670 req->status = REQ_STATUS_UNSENT;
671 list_add_tail(&req->req_list, &m->unsent_req_list);
672 spin_unlock(&client->lock);
673
674 if (test_and_clear_bit(Wpending, &m->wsched))
675 n = POLLOUT;
676 else
677 n = p9_fd_poll(m->client, NULL);
678
679 if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched))
680 schedule_work(&m->wq);
681
682 return 0;
683 }
684
685 static int p9_fd_cancel(struct p9_client *client, struct p9_req_t *req)
686 {
687 int ret = 1;
688
689 P9_DPRINTK(P9_DEBUG_TRANS, "client %p req %p\n", client, req);
690
691 spin_lock(&client->lock);
692
693 if (req->status == REQ_STATUS_UNSENT) {
694 list_del(&req->req_list);
695 req->status = REQ_STATUS_FLSHD;
696 ret = 0;
697 } else if (req->status == REQ_STATUS_SENT)
698 req->status = REQ_STATUS_FLSH;
699
700 spin_unlock(&client->lock);
701
702 return ret;
703 }
704
705 /**
706 * parse_opts - parse mount options into p9_fd_opts structure
707 * @params: options string passed from mount
708 * @opts: fd transport-specific structure to parse options into
709 *
710 * Returns 0 upon success, -ERRNO upon failure
711 */
712
713 static int parse_opts(char *params, struct p9_fd_opts *opts)
714 {
715 char *p;
716 substring_t args[MAX_OPT_ARGS];
717 int option;
718 char *options, *tmp_options;
719
720 opts->port = P9_PORT;
721 opts->rfd = ~0;
722 opts->wfd = ~0;
723
724 if (!params)
725 return 0;
726
727 tmp_options = kstrdup(params, GFP_KERNEL);
728 if (!tmp_options) {
729 P9_DPRINTK(P9_DEBUG_ERROR,
730 "failed to allocate copy of option string\n");
731 return -ENOMEM;
732 }
733 options = tmp_options;
734
735 while ((p = strsep(&options, ",")) != NULL) {
736 int token;
737 int r;
738 if (!*p)
739 continue;
740 token = match_token(p, tokens, args);
741 if (token != Opt_err) {
742 r = match_int(&args[0], &option);
743 if (r < 0) {
744 P9_DPRINTK(P9_DEBUG_ERROR,
745 "integer field, but no integer?\n");
746 continue;
747 }
748 }
749 switch (token) {
750 case Opt_port:
751 opts->port = option;
752 break;
753 case Opt_rfdno:
754 opts->rfd = option;
755 break;
756 case Opt_wfdno:
757 opts->wfd = option;
758 break;
759 default:
760 continue;
761 }
762 }
763
764 kfree(tmp_options);
765 return 0;
766 }
767
768 static int p9_fd_open(struct p9_client *client, int rfd, int wfd)
769 {
770 struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd),
771 GFP_KERNEL);
772 if (!ts)
773 return -ENOMEM;
774
775 ts->rd = fget(rfd);
776 ts->wr = fget(wfd);
777 if (!ts->rd || !ts->wr) {
778 if (ts->rd)
779 fput(ts->rd);
780 if (ts->wr)
781 fput(ts->wr);
782 kfree(ts);
783 return -EIO;
784 }
785
786 client->trans = ts;
787 client->status = Connected;
788
789 return 0;
790 }
791
792 static int p9_socket_open(struct p9_client *client, struct socket *csocket)
793 {
794 struct p9_trans_fd *p;
795 int ret, fd;
796
797 p = kmalloc(sizeof(struct p9_trans_fd), GFP_KERNEL);
798 if (!p)
799 return -ENOMEM;
800
801 csocket->sk->sk_allocation = GFP_NOIO;
802 fd = sock_map_fd(csocket, 0);
803 if (fd < 0) {
804 P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to map fd\n");
805 sock_release(csocket);
806 kfree(p);
807 return fd;
808 }
809
810 get_file(csocket->file);
811 get_file(csocket->file);
812 p->wr = p->rd = csocket->file;
813 client->trans = p;
814 client->status = Connected;
815
816 sys_close(fd); /* still racy */
817
818 p->rd->f_flags |= O_NONBLOCK;
819
820 p->conn = p9_conn_create(client);
821 if (IS_ERR(p->conn)) {
822 ret = PTR_ERR(p->conn);
823 p->conn = NULL;
824 kfree(p);
825 sockfd_put(csocket);
826 sockfd_put(csocket);
827 return ret;
828 }
829 return 0;
830 }
831
832 /**
833 * p9_mux_destroy - cancels all pending requests and frees mux resources
834 * @m: mux to destroy
835 *
836 */
837
838 static void p9_conn_destroy(struct p9_conn *m)
839 {
840 P9_DPRINTK(P9_DEBUG_TRANS, "mux %p prev %p next %p\n", m,
841 m->mux_list.prev, m->mux_list.next);
842
843 p9_mux_poll_stop(m);
844 cancel_work_sync(&m->rq);
845 cancel_work_sync(&m->wq);
846
847 p9_conn_cancel(m, -ECONNRESET);
848
849 m->client = NULL;
850 kfree(m);
851 }
852
853 /**
854 * p9_fd_close - shutdown file descriptor transport
855 * @client: client instance
856 *
857 */
858
859 static void p9_fd_close(struct p9_client *client)
860 {
861 struct p9_trans_fd *ts;
862
863 if (!client)
864 return;
865
866 ts = client->trans;
867 if (!ts)
868 return;
869
870 client->status = Disconnected;
871
872 p9_conn_destroy(ts->conn);
873
874 if (ts->rd)
875 fput(ts->rd);
876 if (ts->wr)
877 fput(ts->wr);
878
879 kfree(ts);
880 }
881
882 /*
883 * stolen from NFS - maybe should be made a generic function?
884 */
885 static inline int valid_ipaddr4(const char *buf)
886 {
887 int rc, count, in[4];
888
889 rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]);
890 if (rc != 4)
891 return -EINVAL;
892 for (count = 0; count < 4; count++) {
893 if (in[count] > 255)
894 return -EINVAL;
895 }
896 return 0;
897 }
898
899 static int
900 p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args)
901 {
902 int err;
903 struct socket *csocket;
904 struct sockaddr_in sin_server;
905 struct p9_fd_opts opts;
906
907 err = parse_opts(args, &opts);
908 if (err < 0)
909 return err;
910
911 if (valid_ipaddr4(addr) < 0)
912 return -EINVAL;
913
914 csocket = NULL;
915
916 sin_server.sin_family = AF_INET;
917 sin_server.sin_addr.s_addr = in_aton(addr);
918 sin_server.sin_port = htons(opts.port);
919 err = __sock_create(read_pnet(&current->nsproxy->net_ns), PF_INET,
920 SOCK_STREAM, IPPROTO_TCP, &csocket, 1);
921 if (err) {
922 P9_EPRINTK(KERN_ERR, "p9_trans_tcp: problem creating socket\n");
923 return err;
924 }
925
926 err = csocket->ops->connect(csocket,
927 (struct sockaddr *)&sin_server,
928 sizeof(struct sockaddr_in), 0);
929 if (err < 0) {
930 P9_EPRINTK(KERN_ERR,
931 "p9_trans_tcp: problem connecting socket to %s\n",
932 addr);
933 sock_release(csocket);
934 return err;
935 }
936
937 return p9_socket_open(client, csocket);
938 }
939
940 static int
941 p9_fd_create_unix(struct p9_client *client, const char *addr, char *args)
942 {
943 int err;
944 struct socket *csocket;
945 struct sockaddr_un sun_server;
946
947 csocket = NULL;
948
949 if (strlen(addr) >= UNIX_PATH_MAX) {
950 P9_EPRINTK(KERN_ERR, "p9_trans_unix: address too long: %s\n",
951 addr);
952 return -ENAMETOOLONG;
953 }
954
955 sun_server.sun_family = PF_UNIX;
956 strcpy(sun_server.sun_path, addr);
957 err = __sock_create(read_pnet(&current->nsproxy->net_ns), PF_UNIX,
958 SOCK_STREAM, 0, &csocket, 1);
959 if (err < 0) {
960 P9_EPRINTK(KERN_ERR, "p9_trans_unix: problem creating socket\n");
961 return err;
962 }
963 err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
964 sizeof(struct sockaddr_un) - 1, 0);
965 if (err < 0) {
966 P9_EPRINTK(KERN_ERR,
967 "p9_trans_unix: problem connecting socket: %s: %d\n",
968 addr, err);
969 sock_release(csocket);
970 return err;
971 }
972
973 return p9_socket_open(client, csocket);
974 }
975
976 static int
977 p9_fd_create(struct p9_client *client, const char *addr, char *args)
978 {
979 int err;
980 struct p9_fd_opts opts;
981 struct p9_trans_fd *p;
982
983 parse_opts(args, &opts);
984
985 if (opts.rfd == ~0 || opts.wfd == ~0) {
986 printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n");
987 return -ENOPROTOOPT;
988 }
989
990 err = p9_fd_open(client, opts.rfd, opts.wfd);
991 if (err < 0)
992 return err;
993
994 p = (struct p9_trans_fd *) client->trans;
995 p->conn = p9_conn_create(client);
996 if (IS_ERR(p->conn)) {
997 err = PTR_ERR(p->conn);
998 p->conn = NULL;
999 fput(p->rd);
1000 fput(p->wr);
1001 return err;
1002 }
1003
1004 return 0;
1005 }
1006
1007 static struct p9_trans_module p9_tcp_trans = {
1008 .name = "tcp",
1009 .maxsize = MAX_SOCK_BUF,
1010 .def = 1,
1011 .create = p9_fd_create_tcp,
1012 .close = p9_fd_close,
1013 .request = p9_fd_request,
1014 .cancel = p9_fd_cancel,
1015 .owner = THIS_MODULE,
1016 };
1017
1018 static struct p9_trans_module p9_unix_trans = {
1019 .name = "unix",
1020 .maxsize = MAX_SOCK_BUF,
1021 .def = 0,
1022 .create = p9_fd_create_unix,
1023 .close = p9_fd_close,
1024 .request = p9_fd_request,
1025 .cancel = p9_fd_cancel,
1026 .owner = THIS_MODULE,
1027 };
1028
1029 static struct p9_trans_module p9_fd_trans = {
1030 .name = "fd",
1031 .maxsize = MAX_SOCK_BUF,
1032 .def = 0,
1033 .create = p9_fd_create,
1034 .close = p9_fd_close,
1035 .request = p9_fd_request,
1036 .cancel = p9_fd_cancel,
1037 .owner = THIS_MODULE,
1038 };
1039
1040 /**
1041 * p9_poll_proc - poll worker thread
1042 * @a: thread state and arguments
1043 *
1044 * polls all v9fs transports for new events and queues the appropriate
1045 * work to the work queue
1046 *
1047 */
1048
1049 static void p9_poll_workfn(struct work_struct *work)
1050 {
1051 unsigned long flags;
1052
1053 P9_DPRINTK(P9_DEBUG_TRANS, "start %p\n", current);
1054
1055 spin_lock_irqsave(&p9_poll_lock, flags);
1056 while (!list_empty(&p9_poll_pending_list)) {
1057 struct p9_conn *conn = list_first_entry(&p9_poll_pending_list,
1058 struct p9_conn,
1059 poll_pending_link);
1060 list_del_init(&conn->poll_pending_link);
1061 spin_unlock_irqrestore(&p9_poll_lock, flags);
1062
1063 p9_poll_mux(conn);
1064
1065 spin_lock_irqsave(&p9_poll_lock, flags);
1066 }
1067 spin_unlock_irqrestore(&p9_poll_lock, flags);
1068
1069 P9_DPRINTK(P9_DEBUG_TRANS, "finish\n");
1070 }
1071
1072 int p9_trans_fd_init(void)
1073 {
1074 v9fs_register_trans(&p9_tcp_trans);
1075 v9fs_register_trans(&p9_unix_trans);
1076 v9fs_register_trans(&p9_fd_trans);
1077
1078 return 0;
1079 }
1080
1081 void p9_trans_fd_exit(void)
1082 {
1083 flush_work_sync(&p9_poll_work);
1084 v9fs_unregister_trans(&p9_tcp_trans);
1085 v9fs_unregister_trans(&p9_unix_trans);
1086 v9fs_unregister_trans(&p9_fd_trans);
1087 }
x86 "subsystem" repository