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Simplify devpts_get_tty()
[linux/fpc-iii.git] / net / 9p / trans_fd.c
blobd652baf5ff919c422664ed8890996d9f71beadc1
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 <net/9p/9p.h>
42 #include <net/9p/transport.h>
43
44 #define P9_PORT 564
45 #define MAX_SOCK_BUF (64*1024)
46 #define ERREQFLUSH 1
47 #define SCHED_TIMEOUT 10
48 #define MAXPOLLWADDR 2
49
50 /**
51 * struct p9_fd_opts - per-transport options
52 * @rfd: file descriptor for reading (trans=fd)
53 * @wfd: file descriptor for writing (trans=fd)
54 * @port: port to connect to (trans=tcp)
55 *
56 */
57
58 struct p9_fd_opts {
59 int rfd;
60 int wfd;
61 u16 port;
62 };
63
64
65 /**
66 * struct p9_trans_fd - transport state
67 * @rd: reference to file to read from
68 * @wr: reference of file to write to
69 * @conn: connection state reference
70 *
71 */
72
73 struct p9_trans_fd {
74 struct file *rd;
75 struct file *wr;
76 struct p9_conn *conn;
77 };
78
79 /*
80 * Option Parsing (code inspired by NFS code)
81 * - a little lazy - parse all fd-transport options
82 */
83
84 enum {
85 /* Options that take integer arguments */
86 Opt_port, Opt_rfdno, Opt_wfdno, Opt_err,
87 };
88
89 static match_table_t tokens = {
90 {Opt_port, "port=%u"},
91 {Opt_rfdno, "rfdno=%u"},
92 {Opt_wfdno, "wfdno=%u"},
93 {Opt_err, NULL},
94 };
95
96 enum {
97 Rworksched = 1, /* read work scheduled or running */
98 Rpending = 2, /* can read */
99 Wworksched = 4, /* write work scheduled or running */
100 Wpending = 8, /* can write */
101 };
102
103 enum {
104 None,
105 Flushing,
106 Flushed,
107 };
108
109 struct p9_req;
110 typedef void (*p9_conn_req_callback)(struct p9_req *req, void *a);
111
112 /**
113 * struct p9_req - fd mux encoding of an rpc transaction
114 * @lock: protects req_list
115 * @tag: numeric tag for rpc transaction
116 * @tcall: request &p9_fcall structure
117 * @rcall: response &p9_fcall structure
118 * @err: error state
119 * @cb: callback for when response is received
120 * @cba: argument to pass to callback
121 * @flush: flag to indicate RPC has been flushed
122 * @req_list: list link for higher level objects to chain requests
123 *
124 */
125
126 struct p9_req {
127 spinlock_t lock;
128 int tag;
129 struct p9_fcall *tcall;
130 struct p9_fcall *rcall;
131 int err;
132 p9_conn_req_callback cb;
133 void *cba;
134 int flush;
135 struct list_head req_list;
136 };
137
138 struct p9_mux_poll_task {
139 struct task_struct *task;
140 struct list_head mux_list;
141 int muxnum;
142 };
143
144 /**
145 * struct p9_conn - fd mux connection state information
146 * @lock: protects mux_list (?)
147 * @mux_list: list link for mux to manage multiple connections (?)
148 * @poll_task: task polling on this connection
149 * @msize: maximum size for connection (dup)
150 * @extended: 9p2000.u flag (dup)
151 * @trans: reference to transport instance for this connection
152 * @tagpool: id accounting for transactions
153 * @err: error state
154 * @req_list: accounting for requests which have been sent
155 * @unsent_req_list: accounting for requests that haven't been sent
156 * @rcall: current response &p9_fcall structure
157 * @rpos: read position in current frame
158 * @rbuf: current read buffer
159 * @wpos: write position for current frame
160 * @wsize: amount of data to write for current frame
161 * @wbuf: current write buffer
162 * @poll_wait: array of wait_q's for various worker threads
163 * @poll_waddr: ????
164 * @pt: poll state
165 * @rq: current read work
166 * @wq: current write work
167 * @wsched: ????
168 *
169 */
170
171 struct p9_conn {
172 spinlock_t lock; /* protect lock structure */
173 struct list_head mux_list;
174 struct p9_mux_poll_task *poll_task;
175 int msize;
176 unsigned char extended;
177 struct p9_trans *trans;
178 struct p9_idpool *tagpool;
179 int err;
180 struct list_head req_list;
181 struct list_head unsent_req_list;
182 struct p9_fcall *rcall;
183 int rpos;
184 char *rbuf;
185 int wpos;
186 int wsize;
187 char *wbuf;
188 wait_queue_t poll_wait[MAXPOLLWADDR];
189 wait_queue_head_t *poll_waddr[MAXPOLLWADDR];
190 poll_table pt;
191 struct work_struct rq;
192 struct work_struct wq;
193 unsigned long wsched;
194 };
195
196 /**
197 * struct p9_mux_rpc - fd mux rpc accounting structure
198 * @m: connection this request was issued on
199 * @err: error state
200 * @tcall: request &p9_fcall
201 * @rcall: response &p9_fcall
202 * @wqueue: wait queue that client is blocked on for this rpc
203 *
204 * Bug: isn't this information duplicated elsewhere like &p9_req
205 */
206
207 struct p9_mux_rpc {
208 struct p9_conn *m;
209 int err;
210 struct p9_fcall *tcall;
211 struct p9_fcall *rcall;
212 wait_queue_head_t wqueue;
213 };
214
215 static int p9_poll_proc(void *);
216 static void p9_read_work(struct work_struct *work);
217 static void p9_write_work(struct work_struct *work);
218 static void p9_pollwait(struct file *filp, wait_queue_head_t *wait_address,
219 poll_table *p);
220 static int p9_fd_write(struct p9_trans *trans, void *v, int len);
221 static int p9_fd_read(struct p9_trans *trans, void *v, int len);
222
223 static DEFINE_MUTEX(p9_mux_task_lock);
224 static struct workqueue_struct *p9_mux_wq;
225
226 static int p9_mux_num;
227 static int p9_mux_poll_task_num;
228 static struct p9_mux_poll_task p9_mux_poll_tasks[100];
229
230 static void p9_conn_destroy(struct p9_conn *);
231 static unsigned int p9_fd_poll(struct p9_trans *trans,
232 struct poll_table_struct *pt);
233
234 #ifdef P9_NONBLOCK
235 static int p9_conn_rpcnb(struct p9_conn *m, struct p9_fcall *tc,
236 p9_conn_req_callback cb, void *a);
237 #endif /* P9_NONBLOCK */
238
239 static void p9_conn_cancel(struct p9_conn *m, int err);
240
241 static u16 p9_mux_get_tag(struct p9_conn *m)
242 {
243 int tag;
244
245 tag = p9_idpool_get(m->tagpool);
246 if (tag < 0)
247 return P9_NOTAG;
248 else
249 return (u16) tag;
250 }
251
252 static void p9_mux_put_tag(struct p9_conn *m, u16 tag)
253 {
254 if (tag != P9_NOTAG && p9_idpool_check(tag, m->tagpool))
255 p9_idpool_put(tag, m->tagpool);
256 }
257
258 /**
259 * p9_mux_calc_poll_procs - calculates the number of polling procs
260 * @muxnum: number of mounts
261 *
262 * Calculation is based on the number of mounted v9fs filesystems.
263 * The current implementation returns sqrt of the number of mounts.
264 */
265
266 static int p9_mux_calc_poll_procs(int muxnum)
267 {
268 int n;
269
270 if (p9_mux_poll_task_num)
271 n = muxnum / p9_mux_poll_task_num +
272 (muxnum % p9_mux_poll_task_num ? 1 : 0);
273 else
274 n = 1;
275
276 if (n > ARRAY_SIZE(p9_mux_poll_tasks))
277 n = ARRAY_SIZE(p9_mux_poll_tasks);
278
279 return n;
280 }
281
282 static int p9_mux_poll_start(struct p9_conn *m)
283 {
284 int i, n;
285 struct p9_mux_poll_task *vpt, *vptlast;
286 struct task_struct *pproc;
287
288 P9_DPRINTK(P9_DEBUG_MUX, "mux %p muxnum %d procnum %d\n", m, p9_mux_num,
289 p9_mux_poll_task_num);
290 mutex_lock(&p9_mux_task_lock);
291
292 n = p9_mux_calc_poll_procs(p9_mux_num + 1);
293 if (n > p9_mux_poll_task_num) {
294 for (i = 0; i < ARRAY_SIZE(p9_mux_poll_tasks); i++) {
295 if (p9_mux_poll_tasks[i].task == NULL) {
296 vpt = &p9_mux_poll_tasks[i];
297 P9_DPRINTK(P9_DEBUG_MUX, "create proc %p\n",
298 vpt);
299 pproc = kthread_create(p9_poll_proc, vpt,
300 "v9fs-poll");
301
302 if (!IS_ERR(pproc)) {
303 vpt->task = pproc;
304 INIT_LIST_HEAD(&vpt->mux_list);
305 vpt->muxnum = 0;
306 p9_mux_poll_task_num++;
307 wake_up_process(vpt->task);
308 }
309 break;
310 }
311 }
312
313 if (i >= ARRAY_SIZE(p9_mux_poll_tasks))
314 P9_DPRINTK(P9_DEBUG_ERROR,
315 "warning: no free poll slots\n");
316 }
317
318 n = (p9_mux_num + 1) / p9_mux_poll_task_num +
319 ((p9_mux_num + 1) % p9_mux_poll_task_num ? 1 : 0);
320
321 vptlast = NULL;
322 for (i = 0; i < ARRAY_SIZE(p9_mux_poll_tasks); i++) {
323 vpt = &p9_mux_poll_tasks[i];
324 if (vpt->task != NULL) {
325 vptlast = vpt;
326 if (vpt->muxnum < n) {
327 P9_DPRINTK(P9_DEBUG_MUX, "put in proc %d\n", i);
328 list_add(&m->mux_list, &vpt->mux_list);
329 vpt->muxnum++;
330 m->poll_task = vpt;
331 memset(&m->poll_waddr, 0,
332 sizeof(m->poll_waddr));
333 init_poll_funcptr(&m->pt, p9_pollwait);
334 break;
335 }
336 }
337 }
338
339 if (i >= ARRAY_SIZE(p9_mux_poll_tasks)) {
340 if (vptlast == NULL) {
341 mutex_unlock(&p9_mux_task_lock);
342 return -ENOMEM;
343 }
344
345 P9_DPRINTK(P9_DEBUG_MUX, "put in proc %d\n", i);
346 list_add(&m->mux_list, &vptlast->mux_list);
347 vptlast->muxnum++;
348 m->poll_task = vptlast;
349 memset(&m->poll_waddr, 0, sizeof(m->poll_waddr));
350 init_poll_funcptr(&m->pt, p9_pollwait);
351 }
352
353 p9_mux_num++;
354 mutex_unlock(&p9_mux_task_lock);
355
356 return 0;
357 }
358
359 static void p9_mux_poll_stop(struct p9_conn *m)
360 {
361 int i;
362 struct p9_mux_poll_task *vpt;
363
364 mutex_lock(&p9_mux_task_lock);
365 vpt = m->poll_task;
366 list_del(&m->mux_list);
367 for (i = 0; i < ARRAY_SIZE(m->poll_waddr); i++) {
368 if (m->poll_waddr[i] != NULL) {
369 remove_wait_queue(m->poll_waddr[i], &m->poll_wait[i]);
370 m->poll_waddr[i] = NULL;
371 }
372 }
373 vpt->muxnum--;
374 if (!vpt->muxnum) {
375 P9_DPRINTK(P9_DEBUG_MUX, "destroy proc %p\n", vpt);
376 kthread_stop(vpt->task);
377 vpt->task = NULL;
378 p9_mux_poll_task_num--;
379 }
380 p9_mux_num--;
381 mutex_unlock(&p9_mux_task_lock);
382 }
383
384 /**
385 * p9_conn_create - allocate and initialize the per-session mux data
386 * @trans: transport structure
387 *
388 * Note: Creates the polling task if this is the first session.
389 */
390
391 static struct p9_conn *p9_conn_create(struct p9_trans *trans)
392 {
393 int i, n;
394 struct p9_conn *m;
395
396 P9_DPRINTK(P9_DEBUG_MUX, "transport %p msize %d\n", trans,
397 trans->msize);
398 m = kzalloc(sizeof(struct p9_conn), GFP_KERNEL);
399 if (!m)
400 return ERR_PTR(-ENOMEM);
401
402 spin_lock_init(&m->lock);
403 INIT_LIST_HEAD(&m->mux_list);
404 m->msize = trans->msize;
405 m->extended = trans->extended;
406 m->trans = trans;
407 m->tagpool = p9_idpool_create();
408 if (IS_ERR(m->tagpool)) {
409 kfree(m);
410 return ERR_PTR(-ENOMEM);
411 }
412
413 INIT_LIST_HEAD(&m->req_list);
414 INIT_LIST_HEAD(&m->unsent_req_list);
415 INIT_WORK(&m->rq, p9_read_work);
416 INIT_WORK(&m->wq, p9_write_work);
417 n = p9_mux_poll_start(m);
418 if (n) {
419 kfree(m);
420 return ERR_PTR(n);
421 }
422
423 n = p9_fd_poll(trans, &m->pt);
424 if (n & POLLIN) {
425 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m);
426 set_bit(Rpending, &m->wsched);
427 }
428
429 if (n & POLLOUT) {
430 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m);
431 set_bit(Wpending, &m->wsched);
432 }
433
434 for (i = 0; i < ARRAY_SIZE(m->poll_waddr); i++) {
435 if (IS_ERR(m->poll_waddr[i])) {
436 p9_mux_poll_stop(m);
437 kfree(m);
438 return (void *)m->poll_waddr; /* the error code */
439 }
440 }
441
442 return m;
443 }
444
445 /**
446 * p9_mux_destroy - cancels all pending requests and frees mux resources
447 * @m: mux to destroy
448 *
449 */
450
451 static void p9_conn_destroy(struct p9_conn *m)
452 {
453 P9_DPRINTK(P9_DEBUG_MUX, "mux %p prev %p next %p\n", m,
454 m->mux_list.prev, m->mux_list.next);
455
456 p9_mux_poll_stop(m);
457 cancel_work_sync(&m->rq);
458 cancel_work_sync(&m->wq);
459
460 p9_conn_cancel(m, -ECONNRESET);
461
462 m->trans = NULL;
463 p9_idpool_destroy(m->tagpool);
464 kfree(m);
465 }
466
467 /**
468 * p9_pollwait - add poll task to the wait queue
469 * @filp: file pointer being polled
470 * @wait_address: wait_q to block on
471 * @p: poll state
472 *
473 * called by files poll operation to add v9fs-poll task to files wait queue
474 */
475
476 static void
477 p9_pollwait(struct file *filp, wait_queue_head_t *wait_address, poll_table *p)
478 {
479 int i;
480 struct p9_conn *m;
481
482 m = container_of(p, struct p9_conn, pt);
483 for (i = 0; i < ARRAY_SIZE(m->poll_waddr); i++)
484 if (m->poll_waddr[i] == NULL)
485 break;
486
487 if (i >= ARRAY_SIZE(m->poll_waddr)) {
488 P9_DPRINTK(P9_DEBUG_ERROR, "not enough wait_address slots\n");
489 return;
490 }
491
492 m->poll_waddr[i] = wait_address;
493
494 if (!wait_address) {
495 P9_DPRINTK(P9_DEBUG_ERROR, "no wait_address\n");
496 m->poll_waddr[i] = ERR_PTR(-EIO);
497 return;
498 }
499
500 init_waitqueue_entry(&m->poll_wait[i], m->poll_task->task);
501 add_wait_queue(wait_address, &m->poll_wait[i]);
502 }
503
504 /**
505 * p9_poll_mux - polls a mux and schedules read or write works if necessary
506 * @m: connection to poll
507 *
508 */
509
510 static void p9_poll_mux(struct p9_conn *m)
511 {
512 int n;
513
514 if (m->err < 0)
515 return;
516
517 n = p9_fd_poll(m->trans, NULL);
518 if (n < 0 || n & (POLLERR | POLLHUP | POLLNVAL)) {
519 P9_DPRINTK(P9_DEBUG_MUX, "error mux %p err %d\n", m, n);
520 if (n >= 0)
521 n = -ECONNRESET;
522 p9_conn_cancel(m, n);
523 }
524
525 if (n & POLLIN) {
526 set_bit(Rpending, &m->wsched);
527 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can read\n", m);
528 if (!test_and_set_bit(Rworksched, &m->wsched)) {
529 P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m);
530 queue_work(p9_mux_wq, &m->rq);
531 }
532 }
533
534 if (n & POLLOUT) {
535 set_bit(Wpending, &m->wsched);
536 P9_DPRINTK(P9_DEBUG_MUX, "mux %p can write\n", m);
537 if ((m->wsize || !list_empty(&m->unsent_req_list))
538 && !test_and_set_bit(Wworksched, &m->wsched)) {
539 P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m);
540 queue_work(p9_mux_wq, &m->wq);
541 }
542 }
543 }
544
545 /**
546 * p9_poll_proc - poll worker thread
547 * @a: thread state and arguments
548 *
549 * polls all v9fs transports for new events and queues the appropriate
550 * work to the work queue
551 *
552 */
553
554 static int p9_poll_proc(void *a)
555 {
556 struct p9_conn *m, *mtmp;
557 struct p9_mux_poll_task *vpt;
558
559 vpt = a;
560 P9_DPRINTK(P9_DEBUG_MUX, "start %p %p\n", current, vpt);
561 while (!kthread_should_stop()) {
562 set_current_state(TASK_INTERRUPTIBLE);
563
564 list_for_each_entry_safe(m, mtmp, &vpt->mux_list, mux_list) {
565 p9_poll_mux(m);
566 }
567
568 P9_DPRINTK(P9_DEBUG_MUX, "sleeping...\n");
569 schedule_timeout(SCHED_TIMEOUT * HZ);
570 }
571
572 __set_current_state(TASK_RUNNING);
573 P9_DPRINTK(P9_DEBUG_MUX, "finish\n");
574 return 0;
575 }
576
577 /**
578 * p9_write_work - called when a transport can send some data
579 * @work: container for work to be done
580 *
581 */
582
583 static void p9_write_work(struct work_struct *work)
584 {
585 int n, err;
586 struct p9_conn *m;
587 struct p9_req *req;
588
589 m = container_of(work, struct p9_conn, wq);
590
591 if (m->err < 0) {
592 clear_bit(Wworksched, &m->wsched);
593 return;
594 }
595
596 if (!m->wsize) {
597 if (list_empty(&m->unsent_req_list)) {
598 clear_bit(Wworksched, &m->wsched);
599 return;
600 }
601
602 spin_lock(&m->lock);
603 again:
604 req = list_entry(m->unsent_req_list.next, struct p9_req,
605 req_list);
606 list_move_tail(&req->req_list, &m->req_list);
607 if (req->err == ERREQFLUSH)
608 goto again;
609
610 m->wbuf = req->tcall->sdata;
611 m->wsize = req->tcall->size;
612 m->wpos = 0;
613 spin_unlock(&m->lock);
614 }
615
616 P9_DPRINTK(P9_DEBUG_MUX, "mux %p pos %d size %d\n", m, m->wpos,
617 m->wsize);
618 clear_bit(Wpending, &m->wsched);
619 err = p9_fd_write(m->trans, m->wbuf + m->wpos, m->wsize - m->wpos);
620 P9_DPRINTK(P9_DEBUG_MUX, "mux %p sent %d bytes\n", m, err);
621 if (err == -EAGAIN) {
622 clear_bit(Wworksched, &m->wsched);
623 return;
624 }
625
626 if (err < 0)
627 goto error;
628 else if (err == 0) {
629 err = -EREMOTEIO;
630 goto error;
631 }
632
633 m->wpos += err;
634 if (m->wpos == m->wsize)
635 m->wpos = m->wsize = 0;
636
637 if (m->wsize == 0 && !list_empty(&m->unsent_req_list)) {
638 if (test_and_clear_bit(Wpending, &m->wsched))
639 n = POLLOUT;
640 else
641 n = p9_fd_poll(m->trans, NULL);
642
643 if (n & POLLOUT) {
644 P9_DPRINTK(P9_DEBUG_MUX, "schedule write work %p\n", m);
645 queue_work(p9_mux_wq, &m->wq);
646 } else
647 clear_bit(Wworksched, &m->wsched);
648 } else
649 clear_bit(Wworksched, &m->wsched);
650
651 return;
652
653 error:
654 p9_conn_cancel(m, err);
655 clear_bit(Wworksched, &m->wsched);
656 }
657
658 static void process_request(struct p9_conn *m, struct p9_req *req)
659 {
660 int ecode;
661 struct p9_str *ename;
662
663 if (!req->err && req->rcall->id == P9_RERROR) {
664 ecode = req->rcall->params.rerror.errno;
665 ename = &req->rcall->params.rerror.error;
666
667 P9_DPRINTK(P9_DEBUG_MUX, "Rerror %.*s\n", ename->len,
668 ename->str);
669
670 if (m->extended)
671 req->err = -ecode;
672
673 if (!req->err) {
674 req->err = p9_errstr2errno(ename->str, ename->len);
675
676 /* string match failed */
677 if (!req->err) {
678 PRINT_FCALL_ERROR("unknown error", req->rcall);
679 req->err = -ESERVERFAULT;
680 }
681 }
682 } else if (req->tcall && req->rcall->id != req->tcall->id + 1) {
683 P9_DPRINTK(P9_DEBUG_ERROR,
684 "fcall mismatch: expected %d, got %d\n",
685 req->tcall->id + 1, req->rcall->id);
686 if (!req->err)
687 req->err = -EIO;
688 }
689 }
690
691 /**
692 * p9_read_work - called when there is some data to be read from a transport
693 * @work: container of work to be done
694 *
695 */
696
697 static void p9_read_work(struct work_struct *work)
698 {
699 int n, err;
700 struct p9_conn *m;
701 struct p9_req *req, *rptr, *rreq;
702 struct p9_fcall *rcall;
703 char *rbuf;
704
705 m = container_of(work, struct p9_conn, rq);
706
707 if (m->err < 0)
708 return;
709
710 rcall = NULL;
711 P9_DPRINTK(P9_DEBUG_MUX, "start mux %p pos %d\n", m, m->rpos);
712
713 if (!m->rcall) {
714 m->rcall =
715 kmalloc(sizeof(struct p9_fcall) + m->msize, GFP_KERNEL);
716 if (!m->rcall) {
717 err = -ENOMEM;
718 goto error;
719 }
720
721 m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall);
722 m->rpos = 0;
723 }
724
725 clear_bit(Rpending, &m->wsched);
726 err = p9_fd_read(m->trans, m->rbuf + m->rpos, m->msize - m->rpos);
727 P9_DPRINTK(P9_DEBUG_MUX, "mux %p got %d bytes\n", m, err);
728 if (err == -EAGAIN) {
729 clear_bit(Rworksched, &m->wsched);
730 return;
731 }
732
733 if (err <= 0)
734 goto error;
735
736 m->rpos += err;
737 while (m->rpos > 4) {
738 n = le32_to_cpu(*(__le32 *) m->rbuf);
739 if (n >= m->msize) {
740 P9_DPRINTK(P9_DEBUG_ERROR,
741 "requested packet size too big: %d\n", n);
742 err = -EIO;
743 goto error;
744 }
745
746 if (m->rpos < n)
747 break;
748
749 err =
750 p9_deserialize_fcall(m->rbuf, n, m->rcall, m->extended);
751 if (err < 0)
752 goto error;
753
754 #ifdef CONFIG_NET_9P_DEBUG
755 if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) {
756 char buf[150];
757
758 p9_printfcall(buf, sizeof(buf), m->rcall,
759 m->extended);
760 printk(KERN_NOTICE ">>> %p %s\n", m, buf);
761 }
762 #endif
763
764 rcall = m->rcall;
765 rbuf = m->rbuf;
766 if (m->rpos > n) {
767 m->rcall = kmalloc(sizeof(struct p9_fcall) + m->msize,
768 GFP_KERNEL);
769 if (!m->rcall) {
770 err = -ENOMEM;
771 goto error;
772 }
773
774 m->rbuf = (char *)m->rcall + sizeof(struct p9_fcall);
775 memmove(m->rbuf, rbuf + n, m->rpos - n);
776 m->rpos -= n;
777 } else {
778 m->rcall = NULL;
779 m->rbuf = NULL;
780 m->rpos = 0;
781 }
782
783 P9_DPRINTK(P9_DEBUG_MUX, "mux %p fcall id %d tag %d\n", m,
784 rcall->id, rcall->tag);
785
786 req = NULL;
787 spin_lock(&m->lock);
788 list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) {
789 if (rreq->tag == rcall->tag) {
790 req = rreq;
791 if (req->flush != Flushing)
792 list_del(&req->req_list);
793 break;
794 }
795 }
796 spin_unlock(&m->lock);
797
798 if (req) {
799 req->rcall = rcall;
800 process_request(m, req);
801
802 if (req->flush != Flushing) {
803 if (req->cb)
804 (*req->cb) (req, req->cba);
805 else
806 kfree(req->rcall);
807 }
808 } else {
809 if (err >= 0 && rcall->id != P9_RFLUSH)
810 P9_DPRINTK(P9_DEBUG_ERROR,
811 "unexpected response mux %p id %d tag %d\n",
812 m, rcall->id, rcall->tag);
813 kfree(rcall);
814 }
815 }
816
817 if (!list_empty(&m->req_list)) {
818 if (test_and_clear_bit(Rpending, &m->wsched))
819 n = POLLIN;
820 else
821 n = p9_fd_poll(m->trans, NULL);
822
823 if (n & POLLIN) {
824 P9_DPRINTK(P9_DEBUG_MUX, "schedule read work %p\n", m);
825 queue_work(p9_mux_wq, &m->rq);
826 } else
827 clear_bit(Rworksched, &m->wsched);
828 } else
829 clear_bit(Rworksched, &m->wsched);
830
831 return;
832
833 error:
834 p9_conn_cancel(m, err);
835 clear_bit(Rworksched, &m->wsched);
836 }
837
838 /**
839 * p9_send_request - send 9P request
840 * The function can sleep until the request is scheduled for sending.
841 * The function can be interrupted. Return from the function is not
842 * a guarantee that the request is sent successfully. Can return errors
843 * that can be retrieved by PTR_ERR macros.
844 *
845 * @m: mux data
846 * @tc: request to be sent
847 * @cb: callback function to call when response is received
848 * @cba: parameter to pass to the callback function
849 *
850 */
851
852 static struct p9_req *p9_send_request(struct p9_conn *m,
853 struct p9_fcall *tc,
854 p9_conn_req_callback cb, void *cba)
855 {
856 int n;
857 struct p9_req *req;
858
859 P9_DPRINTK(P9_DEBUG_MUX, "mux %p task %p tcall %p id %d\n", m, current,
860 tc, tc->id);
861 if (m->err < 0)
862 return ERR_PTR(m->err);
863
864 req = kmalloc(sizeof(struct p9_req), GFP_KERNEL);
865 if (!req)
866 return ERR_PTR(-ENOMEM);
867
868 if (tc->id == P9_TVERSION)
869 n = P9_NOTAG;
870 else
871 n = p9_mux_get_tag(m);
872
873 if (n < 0) {
874 kfree(req);
875 return ERR_PTR(-ENOMEM);
876 }
877
878 p9_set_tag(tc, n);
879
880 #ifdef CONFIG_NET_9P_DEBUG
881 if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) {
882 char buf[150];
883
884 p9_printfcall(buf, sizeof(buf), tc, m->extended);
885 printk(KERN_NOTICE "<<< %p %s\n", m, buf);
886 }
887 #endif
888
889 spin_lock_init(&req->lock);
890 req->tag = n;
891 req->tcall = tc;
892 req->rcall = NULL;
893 req->err = 0;
894 req->cb = cb;
895 req->cba = cba;
896 req->flush = None;
897
898 spin_lock(&m->lock);
899 list_add_tail(&req->req_list, &m->unsent_req_list);
900 spin_unlock(&m->lock);
901
902 if (test_and_clear_bit(Wpending, &m->wsched))
903 n = POLLOUT;
904 else
905 n = p9_fd_poll(m->trans, NULL);
906
907 if (n & POLLOUT && !test_and_set_bit(Wworksched, &m->wsched))
908 queue_work(p9_mux_wq, &m->wq);
909
910 return req;
911 }
912
913 static void p9_mux_free_request(struct p9_conn *m, struct p9_req *req)
914 {
915 p9_mux_put_tag(m, req->tag);
916 kfree(req);
917 }
918
919 static void p9_mux_flush_cb(struct p9_req *freq, void *a)
920 {
921 int tag;
922 struct p9_conn *m;
923 struct p9_req *req, *rreq, *rptr;
924
925 m = a;
926 P9_DPRINTK(P9_DEBUG_MUX, "mux %p tc %p rc %p err %d oldtag %d\n", m,
927 freq->tcall, freq->rcall, freq->err,
928 freq->tcall->params.tflush.oldtag);
929
930 spin_lock(&m->lock);
931 tag = freq->tcall->params.tflush.oldtag;
932 req = NULL;
933 list_for_each_entry_safe(rreq, rptr, &m->req_list, req_list) {
934 if (rreq->tag == tag) {
935 req = rreq;
936 list_del(&req->req_list);
937 break;
938 }
939 }
940 spin_unlock(&m->lock);
941
942 if (req) {
943 spin_lock(&req->lock);
944 req->flush = Flushed;
945 spin_unlock(&req->lock);
946
947 if (req->cb)
948 (*req->cb) (req, req->cba);
949 else
950 kfree(req->rcall);
951 }
952
953 kfree(freq->tcall);
954 kfree(freq->rcall);
955 p9_mux_free_request(m, freq);
956 }
957
958 static int
959 p9_mux_flush_request(struct p9_conn *m, struct p9_req *req)
960 {
961 struct p9_fcall *fc;
962 struct p9_req *rreq, *rptr;
963
964 P9_DPRINTK(P9_DEBUG_MUX, "mux %p req %p tag %d\n", m, req, req->tag);
965
966 /* if a response was received for a request, do nothing */
967 spin_lock(&req->lock);
968 if (req->rcall || req->err) {
969 spin_unlock(&req->lock);
970 P9_DPRINTK(P9_DEBUG_MUX,
971 "mux %p req %p response already received\n", m, req);
972 return 0;
973 }
974
975 req->flush = Flushing;
976 spin_unlock(&req->lock);
977
978 spin_lock(&m->lock);
979 /* if the request is not sent yet, just remove it from the list */
980 list_for_each_entry_safe(rreq, rptr, &m->unsent_req_list, req_list) {
981 if (rreq->tag == req->tag) {
982 P9_DPRINTK(P9_DEBUG_MUX,
983 "mux %p req %p request is not sent yet\n", m, req);
984 list_del(&rreq->req_list);
985 req->flush = Flushed;
986 spin_unlock(&m->lock);
987 if (req->cb)
988 (*req->cb) (req, req->cba);
989 return 0;
990 }
991 }
992 spin_unlock(&m->lock);
993
994 clear_thread_flag(TIF_SIGPENDING);
995 fc = p9_create_tflush(req->tag);
996 p9_send_request(m, fc, p9_mux_flush_cb, m);
997 return 1;
998 }
999
1000 static void
1001 p9_conn_rpc_cb(struct p9_req *req, void *a)
1002 {
1003 struct p9_mux_rpc *r;
1004
1005 P9_DPRINTK(P9_DEBUG_MUX, "req %p r %p\n", req, a);
1006 r = a;
1007 r->rcall = req->rcall;
1008 r->err = req->err;
1009
1010 if (req->flush != None && !req->err)
1011 r->err = -ERESTARTSYS;
1012
1013 wake_up(&r->wqueue);
1014 }
1015
1016 /**
1017 * p9_fd_rpc- sends 9P request and waits until a response is available.
1018 * The function can be interrupted.
1019 * @t: transport data
1020 * @tc: request to be sent
1021 * @rc: pointer where a pointer to the response is stored
1022 *
1023 */
1024
1025 int
1026 p9_fd_rpc(struct p9_trans *t, struct p9_fcall *tc, struct p9_fcall **rc)
1027 {
1028 struct p9_trans_fd *p = t->priv;
1029 struct p9_conn *m = p->conn;
1030 int err, sigpending;
1031 unsigned long flags;
1032 struct p9_req *req;
1033 struct p9_mux_rpc r;
1034
1035 r.err = 0;
1036 r.tcall = tc;
1037 r.rcall = NULL;
1038 r.m = m;
1039 init_waitqueue_head(&r.wqueue);
1040
1041 if (rc)
1042 *rc = NULL;
1043
1044 sigpending = 0;
1045 if (signal_pending(current)) {
1046 sigpending = 1;
1047 clear_thread_flag(TIF_SIGPENDING);
1048 }
1049
1050 req = p9_send_request(m, tc, p9_conn_rpc_cb, &r);
1051 if (IS_ERR(req)) {
1052 err = PTR_ERR(req);
1053 P9_DPRINTK(P9_DEBUG_MUX, "error %d\n", err);
1054 return err;
1055 }
1056
1057 err = wait_event_interruptible(r.wqueue, r.rcall != NULL || r.err < 0);
1058 if (r.err < 0)
1059 err = r.err;
1060
1061 if (err == -ERESTARTSYS && m->trans->status == Connected
1062 && m->err == 0) {
1063 if (p9_mux_flush_request(m, req)) {
1064 /* wait until we get response of the flush message */
1065 do {
1066 clear_thread_flag(TIF_SIGPENDING);
1067 err = wait_event_interruptible(r.wqueue,
1068 r.rcall || r.err);
1069 } while (!r.rcall && !r.err && err == -ERESTARTSYS &&
1070 m->trans->status == Connected && !m->err);
1071
1072 err = -ERESTARTSYS;
1073 }
1074 sigpending = 1;
1075 }
1076
1077 if (sigpending) {
1078 spin_lock_irqsave(&current->sighand->siglock, flags);
1079 recalc_sigpending();
1080 spin_unlock_irqrestore(&current->sighand->siglock, flags);
1081 }
1082
1083 if (rc)
1084 *rc = r.rcall;
1085 else
1086 kfree(r.rcall);
1087
1088 p9_mux_free_request(m, req);
1089 if (err > 0)
1090 err = -EIO;
1091
1092 return err;
1093 }
1094
1095 #ifdef P9_NONBLOCK
1096 /**
1097 * p9_conn_rpcnb - sends 9P request without waiting for response.
1098 * @m: mux data
1099 * @tc: request to be sent
1100 * @cb: callback function to be called when response arrives
1101 * @a: value to pass to the callback function
1102 *
1103 */
1104
1105 int p9_conn_rpcnb(struct p9_conn *m, struct p9_fcall *tc,
1106 p9_conn_req_callback cb, void *a)
1107 {
1108 int err;
1109 struct p9_req *req;
1110
1111 req = p9_send_request(m, tc, cb, a);
1112 if (IS_ERR(req)) {
1113 err = PTR_ERR(req);
1114 P9_DPRINTK(P9_DEBUG_MUX, "error %d\n", err);
1115 return PTR_ERR(req);
1116 }
1117
1118 P9_DPRINTK(P9_DEBUG_MUX, "mux %p tc %p tag %d\n", m, tc, req->tag);
1119 return 0;
1120 }
1121 #endif /* P9_NONBLOCK */
1122
1123 /**
1124 * p9_conn_cancel - cancel all pending requests with error
1125 * @m: mux data
1126 * @err: error code
1127 *
1128 */
1129
1130 void p9_conn_cancel(struct p9_conn *m, int err)
1131 {
1132 struct p9_req *req, *rtmp;
1133 LIST_HEAD(cancel_list);
1134
1135 P9_DPRINTK(P9_DEBUG_ERROR, "mux %p err %d\n", m, err);
1136 m->err = err;
1137 spin_lock(&m->lock);
1138 list_for_each_entry_safe(req, rtmp, &m->req_list, req_list) {
1139 list_move(&req->req_list, &cancel_list);
1140 }
1141 list_for_each_entry_safe(req, rtmp, &m->unsent_req_list, req_list) {
1142 list_move(&req->req_list, &cancel_list);
1143 }
1144 spin_unlock(&m->lock);
1145
1146 list_for_each_entry_safe(req, rtmp, &cancel_list, req_list) {
1147 list_del(&req->req_list);
1148 if (!req->err)
1149 req->err = err;
1150
1151 if (req->cb)
1152 (*req->cb) (req, req->cba);
1153 else
1154 kfree(req->rcall);
1155 }
1156 }
1157
1158 /**
1159 * parse_options - parse mount options into session structure
1160 * @options: options string passed from mount
1161 * @opts: transport-specific structure to parse options into
1162 *
1163 * Returns 0 upon success, -ERRNO upon failure
1164 */
1165
1166 static int parse_opts(char *params, struct p9_fd_opts *opts)
1167 {
1168 char *p;
1169 substring_t args[MAX_OPT_ARGS];
1170 int option;
1171 char *options;
1172 int ret;
1173
1174 opts->port = P9_PORT;
1175 opts->rfd = ~0;
1176 opts->wfd = ~0;
1177
1178 if (!params)
1179 return 0;
1180
1181 options = kstrdup(params, GFP_KERNEL);
1182 if (!options) {
1183 P9_DPRINTK(P9_DEBUG_ERROR,
1184 "failed to allocate copy of option string\n");
1185 return -ENOMEM;
1186 }
1187
1188 while ((p = strsep(&options, ",")) != NULL) {
1189 int token;
1190 int r;
1191 if (!*p)
1192 continue;
1193 token = match_token(p, tokens, args);
1194 r = match_int(&args[0], &option);
1195 if (r < 0) {
1196 P9_DPRINTK(P9_DEBUG_ERROR,
1197 "integer field, but no integer?\n");
1198 ret = r;
1199 continue;
1200 }
1201 switch (token) {
1202 case Opt_port:
1203 opts->port = option;
1204 break;
1205 case Opt_rfdno:
1206 opts->rfd = option;
1207 break;
1208 case Opt_wfdno:
1209 opts->wfd = option;
1210 break;
1211 default:
1212 continue;
1213 }
1214 }
1215 kfree(options);
1216 return 0;
1217 }
1218
1219 static int p9_fd_open(struct p9_trans *trans, int rfd, int wfd)
1220 {
1221 struct p9_trans_fd *ts = kmalloc(sizeof(struct p9_trans_fd),
1222 GFP_KERNEL);
1223 if (!ts)
1224 return -ENOMEM;
1225
1226 ts->rd = fget(rfd);
1227 ts->wr = fget(wfd);
1228 if (!ts->rd || !ts->wr) {
1229 if (ts->rd)
1230 fput(ts->rd);
1231 if (ts->wr)
1232 fput(ts->wr);
1233 kfree(ts);
1234 return -EIO;
1235 }
1236
1237 trans->priv = ts;
1238 trans->status = Connected;
1239
1240 return 0;
1241 }
1242
1243 static int p9_socket_open(struct p9_trans *trans, struct socket *csocket)
1244 {
1245 int fd, ret;
1246
1247 csocket->sk->sk_allocation = GFP_NOIO;
1248 fd = sock_map_fd(csocket, 0);
1249 if (fd < 0) {
1250 P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to map fd\n");
1251 return fd;
1252 }
1253
1254 ret = p9_fd_open(trans, fd, fd);
1255 if (ret < 0) {
1256 P9_EPRINTK(KERN_ERR, "p9_socket_open: failed to open fd\n");
1257 sockfd_put(csocket);
1258 return ret;
1259 }
1260
1261 ((struct p9_trans_fd *)trans->priv)->rd->f_flags |= O_NONBLOCK;
1262
1263 return 0;
1264 }
1265
1266 /**
1267 * p9_fd_read- read from a fd
1268 * @trans: transport instance state
1269 * @v: buffer to receive data into
1270 * @len: size of receive buffer
1271 *
1272 */
1273
1274 static int p9_fd_read(struct p9_trans *trans, void *v, int len)
1275 {
1276 int ret;
1277 struct p9_trans_fd *ts = NULL;
1278
1279 if (trans && trans->status != Disconnected)
1280 ts = trans->priv;
1281
1282 if (!ts)
1283 return -EREMOTEIO;
1284
1285 if (!(ts->rd->f_flags & O_NONBLOCK))
1286 P9_DPRINTK(P9_DEBUG_ERROR, "blocking read ...\n");
1287
1288 ret = kernel_read(ts->rd, ts->rd->f_pos, v, len);
1289 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
1290 trans->status = Disconnected;
1291 return ret;
1292 }
1293
1294 /**
1295 * p9_fd_write - write to a socket
1296 * @trans: transport instance state
1297 * @v: buffer to send data from
1298 * @len: size of send buffer
1299 *
1300 */
1301
1302 static int p9_fd_write(struct p9_trans *trans, void *v, int len)
1303 {
1304 int ret;
1305 mm_segment_t oldfs;
1306 struct p9_trans_fd *ts = NULL;
1307
1308 if (trans && trans->status != Disconnected)
1309 ts = trans->priv;
1310
1311 if (!ts)
1312 return -EREMOTEIO;
1313
1314 if (!(ts->wr->f_flags & O_NONBLOCK))
1315 P9_DPRINTK(P9_DEBUG_ERROR, "blocking write ...\n");
1316
1317 oldfs = get_fs();
1318 set_fs(get_ds());
1319 /* The cast to a user pointer is valid due to the set_fs() */
1320 ret = vfs_write(ts->wr, (void __user *)v, len, &ts->wr->f_pos);
1321 set_fs(oldfs);
1322
1323 if (ret <= 0 && ret != -ERESTARTSYS && ret != -EAGAIN)
1324 trans->status = Disconnected;
1325 return ret;
1326 }
1327
1328 static unsigned int
1329 p9_fd_poll(struct p9_trans *trans, struct poll_table_struct *pt)
1330 {
1331 int ret, n;
1332 struct p9_trans_fd *ts = NULL;
1333
1334 if (trans && trans->status == Connected)
1335 ts = trans->priv;
1336
1337 if (!ts)
1338 return -EREMOTEIO;
1339
1340 if (!ts->rd->f_op || !ts->rd->f_op->poll)
1341 return -EIO;
1342
1343 if (!ts->wr->f_op || !ts->wr->f_op->poll)
1344 return -EIO;
1345
1346 ret = ts->rd->f_op->poll(ts->rd, pt);
1347 if (ret < 0)
1348 return ret;
1349
1350 if (ts->rd != ts->wr) {
1351 n = ts->wr->f_op->poll(ts->wr, pt);
1352 if (n < 0)
1353 return n;
1354 ret = (ret & ~POLLOUT) | (n & ~POLLIN);
1355 }
1356
1357 return ret;
1358 }
1359
1360 /**
1361 * p9_fd_close - shutdown socket
1362 * @trans: private socket structure
1363 *
1364 */
1365
1366 static void p9_fd_close(struct p9_trans *trans)
1367 {
1368 struct p9_trans_fd *ts;
1369
1370 if (!trans)
1371 return;
1372
1373 ts = xchg(&trans->priv, NULL);
1374
1375 if (!ts)
1376 return;
1377
1378 p9_conn_destroy(ts->conn);
1379
1380 trans->status = Disconnected;
1381 if (ts->rd)
1382 fput(ts->rd);
1383 if (ts->wr)
1384 fput(ts->wr);
1385 kfree(ts);
1386 }
1387
1388 /*
1389 * stolen from NFS - maybe should be made a generic function?
1390 */
1391 static inline int valid_ipaddr4(const char *buf)
1392 {
1393 int rc, count, in[4];
1394
1395 rc = sscanf(buf, "%d.%d.%d.%d", &in[0], &in[1], &in[2], &in[3]);
1396 if (rc != 4)
1397 return -EINVAL;
1398 for (count = 0; count < 4; count++) {
1399 if (in[count] > 255)
1400 return -EINVAL;
1401 }
1402 return 0;
1403 }
1404
1405 static struct p9_trans *
1406 p9_trans_create_tcp(const char *addr, char *args, int msize, unsigned char dotu)
1407 {
1408 int err;
1409 struct p9_trans *trans;
1410 struct socket *csocket;
1411 struct sockaddr_in sin_server;
1412 struct p9_fd_opts opts;
1413 struct p9_trans_fd *p;
1414
1415 err = parse_opts(args, &opts);
1416 if (err < 0)
1417 return ERR_PTR(err);
1418
1419 if (valid_ipaddr4(addr) < 0)
1420 return ERR_PTR(-EINVAL);
1421
1422 csocket = NULL;
1423 trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL);
1424 if (!trans)
1425 return ERR_PTR(-ENOMEM);
1426 trans->msize = msize;
1427 trans->extended = dotu;
1428 trans->rpc = p9_fd_rpc;
1429 trans->close = p9_fd_close;
1430
1431 sin_server.sin_family = AF_INET;
1432 sin_server.sin_addr.s_addr = in_aton(addr);
1433 sin_server.sin_port = htons(opts.port);
1434 sock_create_kern(PF_INET, SOCK_STREAM, IPPROTO_TCP, &csocket);
1435
1436 if (!csocket) {
1437 P9_EPRINTK(KERN_ERR, "p9_trans_tcp: problem creating socket\n");
1438 err = -EIO;
1439 goto error;
1440 }
1441
1442 err = csocket->ops->connect(csocket,
1443 (struct sockaddr *)&sin_server,
1444 sizeof(struct sockaddr_in), 0);
1445 if (err < 0) {
1446 P9_EPRINTK(KERN_ERR,
1447 "p9_trans_tcp: problem connecting socket to %s\n",
1448 addr);
1449 goto error;
1450 }
1451
1452 err = p9_socket_open(trans, csocket);
1453 if (err < 0)
1454 goto error;
1455
1456 p = (struct p9_trans_fd *) trans->priv;
1457 p->conn = p9_conn_create(trans);
1458 if (IS_ERR(p->conn)) {
1459 err = PTR_ERR(p->conn);
1460 p->conn = NULL;
1461 goto error;
1462 }
1463
1464 return trans;
1465
1466 error:
1467 if (csocket)
1468 sock_release(csocket);
1469
1470 kfree(trans);
1471 return ERR_PTR(err);
1472 }
1473
1474 static struct p9_trans *
1475 p9_trans_create_unix(const char *addr, char *args, int msize,
1476 unsigned char dotu)
1477 {
1478 int err;
1479 struct socket *csocket;
1480 struct sockaddr_un sun_server;
1481 struct p9_trans *trans;
1482 struct p9_trans_fd *p;
1483
1484 csocket = NULL;
1485 trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL);
1486 if (!trans)
1487 return ERR_PTR(-ENOMEM);
1488
1489 trans->rpc = p9_fd_rpc;
1490 trans->close = p9_fd_close;
1491
1492 if (strlen(addr) > UNIX_PATH_MAX) {
1493 P9_EPRINTK(KERN_ERR, "p9_trans_unix: address too long: %s\n",
1494 addr);
1495 err = -ENAMETOOLONG;
1496 goto error;
1497 }
1498
1499 sun_server.sun_family = PF_UNIX;
1500 strcpy(sun_server.sun_path, addr);
1501 sock_create_kern(PF_UNIX, SOCK_STREAM, 0, &csocket);
1502 err = csocket->ops->connect(csocket, (struct sockaddr *)&sun_server,
1503 sizeof(struct sockaddr_un) - 1, 0);
1504 if (err < 0) {
1505 P9_EPRINTK(KERN_ERR,
1506 "p9_trans_unix: problem connecting socket: %s: %d\n",
1507 addr, err);
1508 goto error;
1509 }
1510
1511 err = p9_socket_open(trans, csocket);
1512 if (err < 0)
1513 goto error;
1514
1515 trans->msize = msize;
1516 trans->extended = dotu;
1517 p = (struct p9_trans_fd *) trans->priv;
1518 p->conn = p9_conn_create(trans);
1519 if (IS_ERR(p->conn)) {
1520 err = PTR_ERR(p->conn);
1521 p->conn = NULL;
1522 goto error;
1523 }
1524
1525 return trans;
1526
1527 error:
1528 if (csocket)
1529 sock_release(csocket);
1530
1531 kfree(trans);
1532 return ERR_PTR(err);
1533 }
1534
1535 static struct p9_trans *
1536 p9_trans_create_fd(const char *name, char *args, int msize,
1537 unsigned char extended)
1538 {
1539 int err;
1540 struct p9_trans *trans;
1541 struct p9_fd_opts opts;
1542 struct p9_trans_fd *p;
1543
1544 parse_opts(args, &opts);
1545
1546 if (opts.rfd == ~0 || opts.wfd == ~0) {
1547 printk(KERN_ERR "v9fs: Insufficient options for proto=fd\n");
1548 return ERR_PTR(-ENOPROTOOPT);
1549 }
1550
1551 trans = kmalloc(sizeof(struct p9_trans), GFP_KERNEL);
1552 if (!trans)
1553 return ERR_PTR(-ENOMEM);
1554
1555 trans->rpc = p9_fd_rpc;
1556 trans->close = p9_fd_close;
1557
1558 err = p9_fd_open(trans, opts.rfd, opts.wfd);
1559 if (err < 0)
1560 goto error;
1561
1562 trans->msize = msize;
1563 trans->extended = extended;
1564 p = (struct p9_trans_fd *) trans->priv;
1565 p->conn = p9_conn_create(trans);
1566 if (IS_ERR(p->conn)) {
1567 err = PTR_ERR(p->conn);
1568 p->conn = NULL;
1569 goto error;
1570 }
1571
1572 return trans;
1573
1574 error:
1575 kfree(trans);
1576 return ERR_PTR(err);
1577 }
1578
1579 static struct p9_trans_module p9_tcp_trans = {
1580 .name = "tcp",
1581 .maxsize = MAX_SOCK_BUF,
1582 .def = 1,
1583 .create = p9_trans_create_tcp,
1584 .owner = THIS_MODULE,
1585 };
1586
1587 static struct p9_trans_module p9_unix_trans = {
1588 .name = "unix",
1589 .maxsize = MAX_SOCK_BUF,
1590 .def = 0,
1591 .create = p9_trans_create_unix,
1592 .owner = THIS_MODULE,
1593 };
1594
1595 static struct p9_trans_module p9_fd_trans = {
1596 .name = "fd",
1597 .maxsize = MAX_SOCK_BUF,
1598 .def = 0,
1599 .create = p9_trans_create_fd,
1600 .owner = THIS_MODULE,
1601 };
1602
1603 int p9_trans_fd_init(void)
1604 {
1605 int i;
1606
1607 for (i = 0; i < ARRAY_SIZE(p9_mux_poll_tasks); i++)
1608 p9_mux_poll_tasks[i].task = NULL;
1609
1610 p9_mux_wq = create_workqueue("v9fs");
1611 if (!p9_mux_wq) {
1612 printk(KERN_WARNING "v9fs: mux: creating workqueue failed\n");
1613 return -ENOMEM;
1614 }
1615
1616 v9fs_register_trans(&p9_tcp_trans);
1617 v9fs_register_trans(&p9_unix_trans);
1618 v9fs_register_trans(&p9_fd_trans);
1619
1620 return 0;
1621 }
1622
1623 void p9_trans_fd_exit(void)
1624 {
1625 v9fs_unregister_trans(&p9_tcp_trans);
1626 v9fs_unregister_trans(&p9_unix_trans);
1627 v9fs_unregister_trans(&p9_fd_trans);
1628
1629 destroy_workqueue(p9_mux_wq);
1630 }
Linux with added FPC-III support