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USB: misc/adutux, fix lock imbalance
[linux-2.6/mini2440.git] / net / 9p / client.c
blob1eb580c38fbbcf63ca5d0bc08ff4ba8a3f3ceb94
1 /*
2 * net/9p/clnt.c
3 *
4 * 9P Client
5 *
6 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to:
20 * Free Software Foundation
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02111-1301 USA
23 *
24 */
25
26 #include <linux/module.h>
27 #include <linux/errno.h>
28 #include <linux/fs.h>
29 #include <linux/poll.h>
30 #include <linux/idr.h>
31 #include <linux/mutex.h>
32 #include <linux/sched.h>
33 #include <linux/uaccess.h>
34 #include <net/9p/9p.h>
35 #include <linux/parser.h>
36 #include <net/9p/client.h>
37 #include <net/9p/transport.h>
38 #include "protocol.h"
39
40 /*
41 * Client Option Parsing (code inspired by NFS code)
42 * - a little lazy - parse all client options
43 */
44
45 enum {
46 Opt_msize,
47 Opt_trans,
48 Opt_legacy,
49 Opt_err,
50 };
51
52 static const match_table_t tokens = {
53 {Opt_msize, "msize=%u"},
54 {Opt_legacy, "noextend"},
55 {Opt_trans, "trans=%s"},
56 {Opt_err, NULL},
57 };
58
59 static struct p9_req_t *
60 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
61
62 /**
63 * v9fs_parse_options - parse mount options into session structure
64 * @options: options string passed from mount
65 * @v9ses: existing v9fs session information
66 *
67 * Return 0 upon success, -ERRNO upon failure
68 */
69
70 static int parse_opts(char *opts, struct p9_client *clnt)
71 {
72 char *options;
73 char *p;
74 substring_t args[MAX_OPT_ARGS];
75 int option;
76 int ret = 0;
77
78 clnt->dotu = 1;
79 clnt->msize = 8192;
80
81 if (!opts)
82 return 0;
83
84 options = kstrdup(opts, GFP_KERNEL);
85 if (!options) {
86 P9_DPRINTK(P9_DEBUG_ERROR,
87 "failed to allocate copy of option string\n");
88 return -ENOMEM;
89 }
90
91 while ((p = strsep(&options, ",")) != NULL) {
92 int token;
93 if (!*p)
94 continue;
95 token = match_token(p, tokens, args);
96 if (token < Opt_trans) {
97 int r = match_int(&args[0], &option);
98 if (r < 0) {
99 P9_DPRINTK(P9_DEBUG_ERROR,
100 "integer field, but no integer?\n");
101 ret = r;
102 continue;
103 }
104 }
105 switch (token) {
106 case Opt_msize:
107 clnt->msize = option;
108 break;
109 case Opt_trans:
110 clnt->trans_mod = v9fs_get_trans_by_name(&args[0]);
111 break;
112 case Opt_legacy:
113 clnt->dotu = 0;
114 break;
115 default:
116 continue;
117 }
118 }
119
120 if (!clnt->trans_mod)
121 clnt->trans_mod = v9fs_get_default_trans();
122
123 kfree(options);
124 return ret;
125 }
126
127 /**
128 * p9_tag_alloc - lookup/allocate a request by tag
129 * @c: client session to lookup tag within
130 * @tag: numeric id for transaction
131 *
132 * this is a simple array lookup, but will grow the
133 * request_slots as necessary to accomodate transaction
134 * ids which did not previously have a slot.
135 *
136 * this code relies on the client spinlock to manage locks, its
137 * possible we should switch to something else, but I'd rather
138 * stick with something low-overhead for the common case.
139 *
140 */
141
142 static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag)
143 {
144 unsigned long flags;
145 int row, col;
146 struct p9_req_t *req;
147
148 /* This looks up the original request by tag so we know which
149 * buffer to read the data into */
150 tag++;
151
152 if (tag >= c->max_tag) {
153 spin_lock_irqsave(&c->lock, flags);
154 /* check again since original check was outside of lock */
155 while (tag >= c->max_tag) {
156 row = (tag / P9_ROW_MAXTAG);
157 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
158 sizeof(struct p9_req_t), GFP_ATOMIC);
159
160 if (!c->reqs[row]) {
161 printk(KERN_ERR "Couldn't grow tag array\n");
162 spin_unlock_irqrestore(&c->lock, flags);
163 return ERR_PTR(-ENOMEM);
164 }
165 for (col = 0; col < P9_ROW_MAXTAG; col++) {
166 c->reqs[row][col].status = REQ_STATUS_IDLE;
167 c->reqs[row][col].tc = NULL;
168 }
169 c->max_tag += P9_ROW_MAXTAG;
170 }
171 spin_unlock_irqrestore(&c->lock, flags);
172 }
173 row = tag / P9_ROW_MAXTAG;
174 col = tag % P9_ROW_MAXTAG;
175
176 req = &c->reqs[row][col];
177 if (!req->tc) {
178 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_KERNEL);
179 if (!req->wq) {
180 printk(KERN_ERR "Couldn't grow tag array\n");
181 return ERR_PTR(-ENOMEM);
182 }
183 init_waitqueue_head(req->wq);
184 req->tc = kmalloc(sizeof(struct p9_fcall)+c->msize,
185 GFP_KERNEL);
186 req->rc = kmalloc(sizeof(struct p9_fcall)+c->msize,
187 GFP_KERNEL);
188 if ((!req->tc) || (!req->rc)) {
189 printk(KERN_ERR "Couldn't grow tag array\n");
190 kfree(req->tc);
191 kfree(req->rc);
192 kfree(req->wq);
193 req->tc = req->rc = NULL;
194 req->wq = NULL;
195 return ERR_PTR(-ENOMEM);
196 }
197 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
198 req->tc->capacity = c->msize;
199 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
200 req->rc->capacity = c->msize;
201 }
202
203 p9pdu_reset(req->tc);
204 p9pdu_reset(req->rc);
205
206 req->flush_tag = 0;
207 req->tc->tag = tag-1;
208 req->status = REQ_STATUS_ALLOC;
209
210 return &c->reqs[row][col];
211 }
212
213 /**
214 * p9_tag_lookup - lookup a request by tag
215 * @c: client session to lookup tag within
216 * @tag: numeric id for transaction
217 *
218 */
219
220 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
221 {
222 int row, col;
223
224 /* This looks up the original request by tag so we know which
225 * buffer to read the data into */
226 tag++;
227
228 BUG_ON(tag >= c->max_tag);
229
230 row = tag / P9_ROW_MAXTAG;
231 col = tag % P9_ROW_MAXTAG;
232
233 return &c->reqs[row][col];
234 }
235 EXPORT_SYMBOL(p9_tag_lookup);
236
237 /**
238 * p9_tag_init - setup tags structure and contents
239 * @tags: tags structure from the client struct
240 *
241 * This initializes the tags structure for each client instance.
242 *
243 */
244
245 static int p9_tag_init(struct p9_client *c)
246 {
247 int err = 0;
248
249 c->tagpool = p9_idpool_create();
250 if (IS_ERR(c->tagpool)) {
251 err = PTR_ERR(c->tagpool);
252 c->tagpool = NULL;
253 goto error;
254 }
255
256 p9_idpool_get(c->tagpool); /* reserve tag 0 */
257
258 c->max_tag = 0;
259 error:
260 return err;
261 }
262
263 /**
264 * p9_tag_cleanup - cleans up tags structure and reclaims resources
265 * @tags: tags structure from the client struct
266 *
267 * This frees resources associated with the tags structure
268 *
269 */
270 static void p9_tag_cleanup(struct p9_client *c)
271 {
272 int row, col;
273
274 /* check to insure all requests are idle */
275 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
276 for (col = 0; col < P9_ROW_MAXTAG; col++) {
277 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
278 P9_DPRINTK(P9_DEBUG_MUX,
279 "Attempting to cleanup non-free tag %d,%d\n",
280 row, col);
281 /* TODO: delay execution of cleanup */
282 return;
283 }
284 }
285 }
286
287 if (c->tagpool)
288 p9_idpool_destroy(c->tagpool);
289
290 /* free requests associated with tags */
291 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
292 for (col = 0; col < P9_ROW_MAXTAG; col++) {
293 kfree(c->reqs[row][col].wq);
294 kfree(c->reqs[row][col].tc);
295 kfree(c->reqs[row][col].rc);
296 }
297 kfree(c->reqs[row]);
298 }
299 c->max_tag = 0;
300 }
301
302 /**
303 * p9_free_req - free a request and clean-up as necessary
304 * c: client state
305 * r: request to release
306 *
307 */
308
309 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
310 {
311 int tag = r->tc->tag;
312 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
313
314 r->status = REQ_STATUS_IDLE;
315 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
316 p9_idpool_put(tag, c->tagpool);
317 }
318
319 /**
320 * p9_client_cb - call back from transport to client
321 * c: client state
322 * req: request received
323 *
324 */
325 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
326 {
327 struct p9_req_t *other_req;
328 unsigned long flags;
329
330 P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
331
332 if (req->status == REQ_STATUS_ERROR)
333 wake_up(req->wq);
334
335 if (req->flush_tag) { /* flush receive path */
336 P9_DPRINTK(P9_DEBUG_9P, "<<< RFLUSH %d\n", req->tc->tag);
337 spin_lock_irqsave(&c->lock, flags);
338 other_req = p9_tag_lookup(c, req->flush_tag);
339 if (other_req->status != REQ_STATUS_FLSH) /* stale flush */
340 spin_unlock_irqrestore(&c->lock, flags);
341 else {
342 other_req->status = REQ_STATUS_FLSHD;
343 spin_unlock_irqrestore(&c->lock, flags);
344 wake_up(other_req->wq);
345 }
346 p9_free_req(c, req);
347 } else { /* normal receive path */
348 P9_DPRINTK(P9_DEBUG_MUX, "normal: tag %d\n", req->tc->tag);
349 spin_lock_irqsave(&c->lock, flags);
350 if (req->status != REQ_STATUS_FLSHD)
351 req->status = REQ_STATUS_RCVD;
352 spin_unlock_irqrestore(&c->lock, flags);
353 wake_up(req->wq);
354 P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
355 }
356 }
357 EXPORT_SYMBOL(p9_client_cb);
358
359 /**
360 * p9_parse_header - parse header arguments out of a packet
361 * @pdu: packet to parse
362 * @size: size of packet
363 * @type: type of request
364 * @tag: tag of packet
365 * @rewind: set if we need to rewind offset afterwards
366 */
367
368 int
369 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
370 int rewind)
371 {
372 int8_t r_type;
373 int16_t r_tag;
374 int32_t r_size;
375 int offset = pdu->offset;
376 int err;
377
378 pdu->offset = 0;
379 if (pdu->size == 0)
380 pdu->size = 7;
381
382 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
383 if (err)
384 goto rewind_and_exit;
385
386 pdu->size = r_size;
387 pdu->id = r_type;
388 pdu->tag = r_tag;
389
390 P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size,
391 pdu->id, pdu->tag);
392
393 if (type)
394 *type = r_type;
395 if (tag)
396 *tag = r_tag;
397 if (size)
398 *size = r_size;
399
400
401 rewind_and_exit:
402 if (rewind)
403 pdu->offset = offset;
404 return err;
405 }
406 EXPORT_SYMBOL(p9_parse_header);
407
408 /**
409 * p9_check_errors - check 9p packet for error return and process it
410 * @c: current client instance
411 * @req: request to parse and check for error conditions
412 *
413 * returns error code if one is discovered, otherwise returns 0
414 *
415 * this will have to be more complicated if we have multiple
416 * error packet types
417 */
418
419 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
420 {
421 int8_t type;
422 int err;
423
424 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
425 if (err) {
426 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
427 return err;
428 }
429
430 if (type == P9_RERROR) {
431 int ecode;
432 char *ename;
433
434 err = p9pdu_readf(req->rc, c->dotu, "s?d", &ename, &ecode);
435 if (err) {
436 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n",
437 err);
438 return err;
439 }
440
441 if (c->dotu)
442 err = -ecode;
443
444 if (!err) {
445 err = p9_errstr2errno(ename, strlen(ename));
446
447 /* string match failed */
448 if (!err)
449 err = -ESERVERFAULT;
450 }
451
452 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode, ename);
453
454 kfree(ename);
455 } else
456 err = 0;
457
458 return err;
459 }
460
461 /**
462 * p9_client_flush - flush (cancel) a request
463 * c: client state
464 * req: request to cancel
465 *
466 * This sents a flush for a particular requests and links
467 * the flush request to the original request. The current
468 * code only supports a single flush request although the protocol
469 * allows for multiple flush requests to be sent for a single request.
470 *
471 */
472
473 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
474 {
475 struct p9_req_t *req;
476 int16_t oldtag;
477 int err;
478
479 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
480 if (err)
481 return err;
482
483 P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
484
485 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
486 if (IS_ERR(req))
487 return PTR_ERR(req);
488
489 req->flush_tag = oldtag;
490
491 /* we don't free anything here because RPC isn't complete */
492 return 0;
493 }
494
495 /**
496 * p9_client_rpc - issue a request and wait for a response
497 * @c: client session
498 * @type: type of request
499 * @fmt: protocol format string (see protocol.c)
500 *
501 * Returns request structure (which client must free using p9_free_req)
502 */
503
504 static struct p9_req_t *
505 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
506 {
507 va_list ap;
508 int tag, err;
509 struct p9_req_t *req;
510 unsigned long flags;
511 int sigpending;
512 int flushed = 0;
513
514 P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
515
516 if (c->status != Connected)
517 return ERR_PTR(-EIO);
518
519 if (signal_pending(current)) {
520 sigpending = 1;
521 clear_thread_flag(TIF_SIGPENDING);
522 } else
523 sigpending = 0;
524
525 tag = P9_NOTAG;
526 if (type != P9_TVERSION) {
527 tag = p9_idpool_get(c->tagpool);
528 if (tag < 0)
529 return ERR_PTR(-ENOMEM);
530 }
531
532 req = p9_tag_alloc(c, tag);
533 if (IS_ERR(req))
534 return req;
535
536 /* marshall the data */
537 p9pdu_prepare(req->tc, tag, type);
538 va_start(ap, fmt);
539 err = p9pdu_vwritef(req->tc, c->dotu, fmt, ap);
540 va_end(ap);
541 p9pdu_finalize(req->tc);
542
543 err = c->trans_mod->request(c, req);
544 if (err < 0) {
545 c->status = Disconnected;
546 goto reterr;
547 }
548
549 /* if it was a flush we just transmitted, return our tag */
550 if (type == P9_TFLUSH)
551 return req;
552 again:
553 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag);
554 err = wait_event_interruptible(*req->wq,
555 req->status >= REQ_STATUS_RCVD);
556 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d (flushed=%d)\n",
557 req->wq, tag, err, flushed);
558
559 if (req->status == REQ_STATUS_ERROR) {
560 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
561 err = req->t_err;
562 } else if (err == -ERESTARTSYS && flushed) {
563 P9_DPRINTK(P9_DEBUG_MUX, "flushed - going again\n");
564 goto again;
565 } else if (req->status == REQ_STATUS_FLSHD) {
566 P9_DPRINTK(P9_DEBUG_MUX, "flushed - erestartsys\n");
567 err = -ERESTARTSYS;
568 }
569
570 if ((err == -ERESTARTSYS) && (c->status == Connected) && (!flushed)) {
571 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
572 spin_lock_irqsave(&c->lock, flags);
573 if (req->status == REQ_STATUS_SENT)
574 req->status = REQ_STATUS_FLSH;
575 spin_unlock_irqrestore(&c->lock, flags);
576 sigpending = 1;
577 flushed = 1;
578 clear_thread_flag(TIF_SIGPENDING);
579
580 if (c->trans_mod->cancel(c, req)) {
581 err = p9_client_flush(c, req);
582 if (err == 0)
583 goto again;
584 }
585 }
586
587 if (sigpending) {
588 spin_lock_irqsave(&current->sighand->siglock, flags);
589 recalc_sigpending();
590 spin_unlock_irqrestore(&current->sighand->siglock, flags);
591 }
592
593 if (err < 0)
594 goto reterr;
595
596 err = p9_check_errors(c, req);
597 if (!err) {
598 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
599 return req;
600 }
601
602 reterr:
603 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
604 err);
605 p9_free_req(c, req);
606 return ERR_PTR(err);
607 }
608
609 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
610 {
611 int ret;
612 struct p9_fid *fid;
613 unsigned long flags;
614
615 P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
616 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
617 if (!fid)
618 return ERR_PTR(-ENOMEM);
619
620 ret = p9_idpool_get(clnt->fidpool);
621 if (ret < 0) {
622 ret = -ENOSPC;
623 goto error;
624 }
625 fid->fid = ret;
626
627 memset(&fid->qid, 0, sizeof(struct p9_qid));
628 fid->mode = -1;
629 fid->rdir_fpos = 0;
630 fid->uid = current_fsuid();
631 fid->clnt = clnt;
632 fid->aux = NULL;
633
634 spin_lock_irqsave(&clnt->lock, flags);
635 list_add(&fid->flist, &clnt->fidlist);
636 spin_unlock_irqrestore(&clnt->lock, flags);
637
638 return fid;
639
640 error:
641 kfree(fid);
642 return ERR_PTR(ret);
643 }
644
645 static void p9_fid_destroy(struct p9_fid *fid)
646 {
647 struct p9_client *clnt;
648 unsigned long flags;
649
650 P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
651 clnt = fid->clnt;
652 p9_idpool_put(fid->fid, clnt->fidpool);
653 spin_lock_irqsave(&clnt->lock, flags);
654 list_del(&fid->flist);
655 spin_unlock_irqrestore(&clnt->lock, flags);
656 kfree(fid);
657 }
658
659 int p9_client_version(struct p9_client *c)
660 {
661 int err = 0;
662 struct p9_req_t *req;
663 char *version;
664 int msize;
665
666 P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d extended %d\n",
667 c->msize, c->dotu);
668 req = p9_client_rpc(c, P9_TVERSION, "ds", c->msize,
669 c->dotu ? "9P2000.u" : "9P2000");
670 if (IS_ERR(req))
671 return PTR_ERR(req);
672
673 err = p9pdu_readf(req->rc, c->dotu, "ds", &msize, &version);
674 if (err) {
675 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
676 p9pdu_dump(1, req->rc);
677 goto error;
678 }
679
680 P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
681 if (!memcmp(version, "9P2000.u", 8))
682 c->dotu = 1;
683 else if (!memcmp(version, "9P2000", 6))
684 c->dotu = 0;
685 else {
686 err = -EREMOTEIO;
687 goto error;
688 }
689
690 if (msize < c->msize)
691 c->msize = msize;
692
693 error:
694 kfree(version);
695 p9_free_req(c, req);
696
697 return err;
698 }
699 EXPORT_SYMBOL(p9_client_version);
700
701 struct p9_client *p9_client_create(const char *dev_name, char *options)
702 {
703 int err;
704 struct p9_client *clnt;
705
706 err = 0;
707 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
708 if (!clnt)
709 return ERR_PTR(-ENOMEM);
710
711 clnt->trans_mod = NULL;
712 clnt->trans = NULL;
713 spin_lock_init(&clnt->lock);
714 INIT_LIST_HEAD(&clnt->fidlist);
715 clnt->fidpool = p9_idpool_create();
716 if (IS_ERR(clnt->fidpool)) {
717 err = PTR_ERR(clnt->fidpool);
718 clnt->fidpool = NULL;
719 goto error;
720 }
721
722 p9_tag_init(clnt);
723
724 err = parse_opts(options, clnt);
725 if (err < 0)
726 goto error;
727
728 if (clnt->trans_mod == NULL) {
729 err = -EPROTONOSUPPORT;
730 P9_DPRINTK(P9_DEBUG_ERROR,
731 "No transport defined or default transport\n");
732 goto error;
733 }
734
735 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d dotu %d\n",
736 clnt, clnt->trans_mod, clnt->msize, clnt->dotu);
737
738 err = clnt->trans_mod->create(clnt, dev_name, options);
739 if (err)
740 goto error;
741
742 if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize)
743 clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ;
744
745 err = p9_client_version(clnt);
746 if (err)
747 goto error;
748
749 return clnt;
750
751 error:
752 p9_client_destroy(clnt);
753 return ERR_PTR(err);
754 }
755 EXPORT_SYMBOL(p9_client_create);
756
757 void p9_client_destroy(struct p9_client *clnt)
758 {
759 struct p9_fid *fid, *fidptr;
760
761 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt);
762
763 if (clnt->trans_mod)
764 clnt->trans_mod->close(clnt);
765
766 v9fs_put_trans(clnt->trans_mod);
767
768 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist)
769 p9_fid_destroy(fid);
770
771 if (clnt->fidpool)
772 p9_idpool_destroy(clnt->fidpool);
773
774 p9_tag_cleanup(clnt);
775
776 kfree(clnt);
777 }
778 EXPORT_SYMBOL(p9_client_destroy);
779
780 void p9_client_disconnect(struct p9_client *clnt)
781 {
782 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
783 clnt->status = Disconnected;
784 }
785 EXPORT_SYMBOL(p9_client_disconnect);
786
787 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
788 char *uname, u32 n_uname, char *aname)
789 {
790 int err;
791 struct p9_req_t *req;
792 struct p9_fid *fid;
793 struct p9_qid qid;
794
795 P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
796 afid ? afid->fid : -1, uname, aname);
797 err = 0;
798
799 fid = p9_fid_create(clnt);
800 if (IS_ERR(fid)) {
801 err = PTR_ERR(fid);
802 fid = NULL;
803 goto error;
804 }
805
806 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
807 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
808 if (IS_ERR(req)) {
809 err = PTR_ERR(req);
810 goto error;
811 }
812
813 err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid);
814 if (err) {
815 p9pdu_dump(1, req->rc);
816 p9_free_req(clnt, req);
817 goto error;
818 }
819
820 P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
821 qid.type,
822 (unsigned long long)qid.path,
823 qid.version);
824
825 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
826
827 p9_free_req(clnt, req);
828 return fid;
829
830 error:
831 if (fid)
832 p9_fid_destroy(fid);
833 return ERR_PTR(err);
834 }
835 EXPORT_SYMBOL(p9_client_attach);
836
837 struct p9_fid *
838 p9_client_auth(struct p9_client *clnt, char *uname, u32 n_uname, char *aname)
839 {
840 int err;
841 struct p9_req_t *req;
842 struct p9_qid qid;
843 struct p9_fid *afid;
844
845 P9_DPRINTK(P9_DEBUG_9P, ">>> TAUTH uname %s aname %s\n", uname, aname);
846 err = 0;
847
848 afid = p9_fid_create(clnt);
849 if (IS_ERR(afid)) {
850 err = PTR_ERR(afid);
851 afid = NULL;
852 goto error;
853 }
854
855 req = p9_client_rpc(clnt, P9_TAUTH, "dss?d",
856 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
857 if (IS_ERR(req)) {
858 err = PTR_ERR(req);
859 goto error;
860 }
861
862 err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid);
863 if (err) {
864 p9pdu_dump(1, req->rc);
865 p9_free_req(clnt, req);
866 goto error;
867 }
868
869 P9_DPRINTK(P9_DEBUG_9P, "<<< RAUTH qid %x.%llx.%x\n",
870 qid.type,
871 (unsigned long long)qid.path,
872 qid.version);
873
874 memmove(&afid->qid, &qid, sizeof(struct p9_qid));
875 p9_free_req(clnt, req);
876 return afid;
877
878 error:
879 if (afid)
880 p9_fid_destroy(afid);
881 return ERR_PTR(err);
882 }
883 EXPORT_SYMBOL(p9_client_auth);
884
885 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
886 int clone)
887 {
888 int err;
889 struct p9_client *clnt;
890 struct p9_fid *fid;
891 struct p9_qid *wqids;
892 struct p9_req_t *req;
893 int16_t nwqids, count;
894
895 err = 0;
896 clnt = oldfid->clnt;
897 if (clone) {
898 fid = p9_fid_create(clnt);
899 if (IS_ERR(fid)) {
900 err = PTR_ERR(fid);
901 fid = NULL;
902 goto error;
903 }
904
905 fid->uid = oldfid->uid;
906 } else
907 fid = oldfid;
908
909
910 P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n",
911 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
912
913 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
914 nwname, wnames);
915 if (IS_ERR(req)) {
916 err = PTR_ERR(req);
917 goto error;
918 }
919
920 err = p9pdu_readf(req->rc, clnt->dotu, "R", &nwqids, &wqids);
921 if (err) {
922 p9pdu_dump(1, req->rc);
923 p9_free_req(clnt, req);
924 goto clunk_fid;
925 }
926 p9_free_req(clnt, req);
927
928 P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
929
930 if (nwqids != nwname) {
931 err = -ENOENT;
932 goto clunk_fid;
933 }
934
935 for (count = 0; count < nwqids; count++)
936 P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
937 count, wqids[count].type,
938 (unsigned long long)wqids[count].path,
939 wqids[count].version);
940
941 if (nwname)
942 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
943 else
944 fid->qid = oldfid->qid;
945
946 return fid;
947
948 clunk_fid:
949 p9_client_clunk(fid);
950 fid = NULL;
951
952 error:
953 if (fid && (fid != oldfid))
954 p9_fid_destroy(fid);
955
956 return ERR_PTR(err);
957 }
958 EXPORT_SYMBOL(p9_client_walk);
959
960 int p9_client_open(struct p9_fid *fid, int mode)
961 {
962 int err;
963 struct p9_client *clnt;
964 struct p9_req_t *req;
965 struct p9_qid qid;
966 int iounit;
967
968 P9_DPRINTK(P9_DEBUG_9P, ">>> TOPEN fid %d mode %d\n", fid->fid, mode);
969 err = 0;
970 clnt = fid->clnt;
971
972 if (fid->mode != -1)
973 return -EINVAL;
974
975 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
976 if (IS_ERR(req)) {
977 err = PTR_ERR(req);
978 goto error;
979 }
980
981 err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit);
982 if (err) {
983 p9pdu_dump(1, req->rc);
984 goto free_and_error;
985 }
986
987 P9_DPRINTK(P9_DEBUG_9P, "<<< ROPEN qid %x.%llx.%x iounit %x\n",
988 qid.type,
989 (unsigned long long)qid.path,
990 qid.version, iounit);
991
992 fid->mode = mode;
993 fid->iounit = iounit;
994
995 free_and_error:
996 p9_free_req(clnt, req);
997 error:
998 return err;
999 }
1000 EXPORT_SYMBOL(p9_client_open);
1001
1002 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1003 char *extension)
1004 {
1005 int err;
1006 struct p9_client *clnt;
1007 struct p9_req_t *req;
1008 struct p9_qid qid;
1009 int iounit;
1010
1011 P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1012 fid->fid, name, perm, mode);
1013 err = 0;
1014 clnt = fid->clnt;
1015
1016 if (fid->mode != -1)
1017 return -EINVAL;
1018
1019 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1020 mode, extension);
1021 if (IS_ERR(req)) {
1022 err = PTR_ERR(req);
1023 goto error;
1024 }
1025
1026 err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit);
1027 if (err) {
1028 p9pdu_dump(1, req->rc);
1029 goto free_and_error;
1030 }
1031
1032 P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1033 qid.type,
1034 (unsigned long long)qid.path,
1035 qid.version, iounit);
1036
1037 fid->mode = mode;
1038 fid->iounit = iounit;
1039
1040 free_and_error:
1041 p9_free_req(clnt, req);
1042 error:
1043 return err;
1044 }
1045 EXPORT_SYMBOL(p9_client_fcreate);
1046
1047 int p9_client_clunk(struct p9_fid *fid)
1048 {
1049 int err;
1050 struct p9_client *clnt;
1051 struct p9_req_t *req;
1052
1053 P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
1054 err = 0;
1055 clnt = fid->clnt;
1056
1057 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1058 if (IS_ERR(req)) {
1059 err = PTR_ERR(req);
1060 goto error;
1061 }
1062
1063 P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1064
1065 p9_free_req(clnt, req);
1066 p9_fid_destroy(fid);
1067
1068 error:
1069 return err;
1070 }
1071 EXPORT_SYMBOL(p9_client_clunk);
1072
1073 int p9_client_remove(struct p9_fid *fid)
1074 {
1075 int err;
1076 struct p9_client *clnt;
1077 struct p9_req_t *req;
1078
1079 P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1080 err = 0;
1081 clnt = fid->clnt;
1082
1083 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1084 if (IS_ERR(req)) {
1085 err = PTR_ERR(req);
1086 goto error;
1087 }
1088
1089 P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1090
1091 p9_free_req(clnt, req);
1092 p9_fid_destroy(fid);
1093
1094 error:
1095 return err;
1096 }
1097 EXPORT_SYMBOL(p9_client_remove);
1098
1099 int
1100 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1101 u32 count)
1102 {
1103 int err, rsize, total;
1104 struct p9_client *clnt;
1105 struct p9_req_t *req;
1106 char *dataptr;
1107
1108 P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid,
1109 (long long unsigned) offset, count);
1110 err = 0;
1111 clnt = fid->clnt;
1112 total = 0;
1113
1114 rsize = fid->iounit;
1115 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1116 rsize = clnt->msize - P9_IOHDRSZ;
1117
1118 if (count < rsize)
1119 rsize = count;
1120
1121 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, rsize);
1122 if (IS_ERR(req)) {
1123 err = PTR_ERR(req);
1124 goto error;
1125 }
1126
1127 err = p9pdu_readf(req->rc, clnt->dotu, "D", &count, &dataptr);
1128 if (err) {
1129 p9pdu_dump(1, req->rc);
1130 goto free_and_error;
1131 }
1132
1133 P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1134
1135 if (data) {
1136 memmove(data, dataptr, count);
1137 data += count;
1138 }
1139
1140 if (udata) {
1141 err = copy_to_user(udata, dataptr, count);
1142 if (err) {
1143 err = -EFAULT;
1144 goto free_and_error;
1145 }
1146 }
1147
1148 p9_free_req(clnt, req);
1149 return count;
1150
1151 free_and_error:
1152 p9_free_req(clnt, req);
1153 error:
1154 return err;
1155 }
1156 EXPORT_SYMBOL(p9_client_read);
1157
1158 int
1159 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1160 u64 offset, u32 count)
1161 {
1162 int err, rsize, total;
1163 struct p9_client *clnt;
1164 struct p9_req_t *req;
1165
1166 P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1167 fid->fid, (long long unsigned) offset, count);
1168 err = 0;
1169 clnt = fid->clnt;
1170 total = 0;
1171
1172 rsize = fid->iounit;
1173 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1174 rsize = clnt->msize - P9_IOHDRSZ;
1175
1176 if (count < rsize)
1177 rsize = count;
1178 if (data)
1179 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, offset,
1180 rsize, data);
1181 else
1182 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, offset,
1183 rsize, udata);
1184 if (IS_ERR(req)) {
1185 err = PTR_ERR(req);
1186 goto error;
1187 }
1188
1189 err = p9pdu_readf(req->rc, clnt->dotu, "d", &count);
1190 if (err) {
1191 p9pdu_dump(1, req->rc);
1192 goto free_and_error;
1193 }
1194
1195 P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1196
1197 p9_free_req(clnt, req);
1198 return count;
1199
1200 free_and_error:
1201 p9_free_req(clnt, req);
1202 error:
1203 return err;
1204 }
1205 EXPORT_SYMBOL(p9_client_write);
1206
1207 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1208 {
1209 int err;
1210 struct p9_client *clnt;
1211 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1212 struct p9_req_t *req;
1213 u16 ignored;
1214
1215 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1216
1217 if (!ret)
1218 return ERR_PTR(-ENOMEM);
1219
1220 err = 0;
1221 clnt = fid->clnt;
1222
1223 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1224 if (IS_ERR(req)) {
1225 err = PTR_ERR(req);
1226 goto error;
1227 }
1228
1229 err = p9pdu_readf(req->rc, clnt->dotu, "wS", &ignored, ret);
1230 if (err) {
1231 ret = ERR_PTR(err);
1232 p9pdu_dump(1, req->rc);
1233 goto free_and_error;
1234 }
1235
1236 P9_DPRINTK(P9_DEBUG_9P,
1237 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1238 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1239 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1240 "<<< uid=%d gid=%d n_muid=%d\n",
1241 ret->size, ret->type, ret->dev, ret->qid.type,
1242 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1243 ret->atime, ret->mtime, (unsigned long long)ret->length,
1244 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1245 ret->n_uid, ret->n_gid, ret->n_muid);
1246
1247 free_and_error:
1248 p9_free_req(clnt, req);
1249 error:
1250 return ret;
1251 }
1252 EXPORT_SYMBOL(p9_client_stat);
1253
1254 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1255 {
1256 int err;
1257 struct p9_req_t *req;
1258 struct p9_client *clnt;
1259
1260 P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1261 P9_DPRINTK(P9_DEBUG_9P,
1262 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1263 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1264 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1265 " uid=%d gid=%d n_muid=%d\n",
1266 wst->size, wst->type, wst->dev, wst->qid.type,
1267 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1268 wst->atime, wst->mtime, (unsigned long long)wst->length,
1269 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1270 wst->n_uid, wst->n_gid, wst->n_muid);
1271 err = 0;
1272 clnt = fid->clnt;
1273
1274 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, 0, wst);
1275 if (IS_ERR(req)) {
1276 err = PTR_ERR(req);
1277 goto error;
1278 }
1279
1280 P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1281
1282 p9_free_req(clnt, req);
1283 error:
1284 return err;
1285 }
1286 EXPORT_SYMBOL(p9_client_wstat);
Support for the Chinese Samsung S3C2440 based development boards