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Staging: hv: coding style cleanup for Channel.c
[linux/fpc-iii.git] / net / 9p / client.c
blob5bf5f227dbe0d83eaf28cc400a665594c6452a22
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 * parse_options - parse mount options into client structure
64 * @opts: options string passed from mount
65 * @clnt: existing v9fs client 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 kfree(options);
121 return ret;
122 }
123
124 /**
125 * p9_tag_alloc - lookup/allocate a request by tag
126 * @c: client session to lookup tag within
127 * @tag: numeric id for transaction
128 *
129 * this is a simple array lookup, but will grow the
130 * request_slots as necessary to accomodate transaction
131 * ids which did not previously have a slot.
132 *
133 * this code relies on the client spinlock to manage locks, its
134 * possible we should switch to something else, but I'd rather
135 * stick with something low-overhead for the common case.
136 *
137 */
138
139 static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag)
140 {
141 unsigned long flags;
142 int row, col;
143 struct p9_req_t *req;
144
145 /* This looks up the original request by tag so we know which
146 * buffer to read the data into */
147 tag++;
148
149 if (tag >= c->max_tag) {
150 spin_lock_irqsave(&c->lock, flags);
151 /* check again since original check was outside of lock */
152 while (tag >= c->max_tag) {
153 row = (tag / P9_ROW_MAXTAG);
154 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
155 sizeof(struct p9_req_t), GFP_ATOMIC);
156
157 if (!c->reqs[row]) {
158 printk(KERN_ERR "Couldn't grow tag array\n");
159 spin_unlock_irqrestore(&c->lock, flags);
160 return ERR_PTR(-ENOMEM);
161 }
162 for (col = 0; col < P9_ROW_MAXTAG; col++) {
163 c->reqs[row][col].status = REQ_STATUS_IDLE;
164 c->reqs[row][col].tc = NULL;
165 }
166 c->max_tag += P9_ROW_MAXTAG;
167 }
168 spin_unlock_irqrestore(&c->lock, flags);
169 }
170 row = tag / P9_ROW_MAXTAG;
171 col = tag % P9_ROW_MAXTAG;
172
173 req = &c->reqs[row][col];
174 if (!req->tc) {
175 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_KERNEL);
176 if (!req->wq) {
177 printk(KERN_ERR "Couldn't grow tag array\n");
178 return ERR_PTR(-ENOMEM);
179 }
180 init_waitqueue_head(req->wq);
181 req->tc = kmalloc(sizeof(struct p9_fcall)+c->msize,
182 GFP_KERNEL);
183 req->rc = kmalloc(sizeof(struct p9_fcall)+c->msize,
184 GFP_KERNEL);
185 if ((!req->tc) || (!req->rc)) {
186 printk(KERN_ERR "Couldn't grow tag array\n");
187 kfree(req->tc);
188 kfree(req->rc);
189 kfree(req->wq);
190 req->tc = req->rc = NULL;
191 req->wq = NULL;
192 return ERR_PTR(-ENOMEM);
193 }
194 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
195 req->tc->capacity = c->msize;
196 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
197 req->rc->capacity = c->msize;
198 }
199
200 p9pdu_reset(req->tc);
201 p9pdu_reset(req->rc);
202
203 req->tc->tag = tag-1;
204 req->status = REQ_STATUS_ALLOC;
205
206 return &c->reqs[row][col];
207 }
208
209 /**
210 * p9_tag_lookup - lookup a request by tag
211 * @c: client session to lookup tag within
212 * @tag: numeric id for transaction
213 *
214 */
215
216 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
217 {
218 int row, col;
219
220 /* This looks up the original request by tag so we know which
221 * buffer to read the data into */
222 tag++;
223
224 BUG_ON(tag >= c->max_tag);
225
226 row = tag / P9_ROW_MAXTAG;
227 col = tag % P9_ROW_MAXTAG;
228
229 return &c->reqs[row][col];
230 }
231 EXPORT_SYMBOL(p9_tag_lookup);
232
233 /**
234 * p9_tag_init - setup tags structure and contents
235 * @c: v9fs client struct
236 *
237 * This initializes the tags structure for each client instance.
238 *
239 */
240
241 static int p9_tag_init(struct p9_client *c)
242 {
243 int err = 0;
244
245 c->tagpool = p9_idpool_create();
246 if (IS_ERR(c->tagpool)) {
247 err = PTR_ERR(c->tagpool);
248 c->tagpool = NULL;
249 goto error;
250 }
251
252 p9_idpool_get(c->tagpool); /* reserve tag 0 */
253
254 c->max_tag = 0;
255 error:
256 return err;
257 }
258
259 /**
260 * p9_tag_cleanup - cleans up tags structure and reclaims resources
261 * @c: v9fs client struct
262 *
263 * This frees resources associated with the tags structure
264 *
265 */
266 static void p9_tag_cleanup(struct p9_client *c)
267 {
268 int row, col;
269
270 /* check to insure all requests are idle */
271 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
272 for (col = 0; col < P9_ROW_MAXTAG; col++) {
273 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
274 P9_DPRINTK(P9_DEBUG_MUX,
275 "Attempting to cleanup non-free tag %d,%d\n",
276 row, col);
277 /* TODO: delay execution of cleanup */
278 return;
279 }
280 }
281 }
282
283 if (c->tagpool)
284 p9_idpool_destroy(c->tagpool);
285
286 /* free requests associated with tags */
287 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
288 for (col = 0; col < P9_ROW_MAXTAG; col++) {
289 kfree(c->reqs[row][col].wq);
290 kfree(c->reqs[row][col].tc);
291 kfree(c->reqs[row][col].rc);
292 }
293 kfree(c->reqs[row]);
294 }
295 c->max_tag = 0;
296 }
297
298 /**
299 * p9_free_req - free a request and clean-up as necessary
300 * c: client state
301 * r: request to release
302 *
303 */
304
305 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
306 {
307 int tag = r->tc->tag;
308 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
309
310 r->status = REQ_STATUS_IDLE;
311 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
312 p9_idpool_put(tag, c->tagpool);
313 }
314
315 /**
316 * p9_client_cb - call back from transport to client
317 * c: client state
318 * req: request received
319 *
320 */
321 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
322 {
323 P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
324 wake_up(req->wq);
325 P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
326 }
327 EXPORT_SYMBOL(p9_client_cb);
328
329 /**
330 * p9_parse_header - parse header arguments out of a packet
331 * @pdu: packet to parse
332 * @size: size of packet
333 * @type: type of request
334 * @tag: tag of packet
335 * @rewind: set if we need to rewind offset afterwards
336 */
337
338 int
339 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
340 int rewind)
341 {
342 int8_t r_type;
343 int16_t r_tag;
344 int32_t r_size;
345 int offset = pdu->offset;
346 int err;
347
348 pdu->offset = 0;
349 if (pdu->size == 0)
350 pdu->size = 7;
351
352 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
353 if (err)
354 goto rewind_and_exit;
355
356 pdu->size = r_size;
357 pdu->id = r_type;
358 pdu->tag = r_tag;
359
360 P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size,
361 pdu->id, pdu->tag);
362
363 if (type)
364 *type = r_type;
365 if (tag)
366 *tag = r_tag;
367 if (size)
368 *size = r_size;
369
370
371 rewind_and_exit:
372 if (rewind)
373 pdu->offset = offset;
374 return err;
375 }
376 EXPORT_SYMBOL(p9_parse_header);
377
378 /**
379 * p9_check_errors - check 9p packet for error return and process it
380 * @c: current client instance
381 * @req: request to parse and check for error conditions
382 *
383 * returns error code if one is discovered, otherwise returns 0
384 *
385 * this will have to be more complicated if we have multiple
386 * error packet types
387 */
388
389 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
390 {
391 int8_t type;
392 int err;
393
394 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
395 if (err) {
396 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
397 return err;
398 }
399
400 if (type == P9_RERROR) {
401 int ecode;
402 char *ename;
403
404 err = p9pdu_readf(req->rc, c->dotu, "s?d", &ename, &ecode);
405 if (err) {
406 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n",
407 err);
408 return err;
409 }
410
411 if (c->dotu)
412 err = -ecode;
413
414 if (!err || !IS_ERR_VALUE(err))
415 err = p9_errstr2errno(ename, strlen(ename));
416
417 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode, ename);
418
419 kfree(ename);
420 } else
421 err = 0;
422
423 return err;
424 }
425
426 /**
427 * p9_client_flush - flush (cancel) a request
428 * @c: client state
429 * @oldreq: request to cancel
430 *
431 * This sents a flush for a particular requests and links
432 * the flush request to the original request. The current
433 * code only supports a single flush request although the protocol
434 * allows for multiple flush requests to be sent for a single request.
435 *
436 */
437
438 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
439 {
440 struct p9_req_t *req;
441 int16_t oldtag;
442 int err;
443
444 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
445 if (err)
446 return err;
447
448 P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
449
450 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
451 if (IS_ERR(req))
452 return PTR_ERR(req);
453
454
455 /* if we haven't received a response for oldreq,
456 remove it from the list. */
457 spin_lock(&c->lock);
458 if (oldreq->status == REQ_STATUS_FLSH)
459 list_del(&oldreq->req_list);
460 spin_unlock(&c->lock);
461
462 p9_free_req(c, req);
463 return 0;
464 }
465
466 /**
467 * p9_client_rpc - issue a request and wait for a response
468 * @c: client session
469 * @type: type of request
470 * @fmt: protocol format string (see protocol.c)
471 *
472 * Returns request structure (which client must free using p9_free_req)
473 */
474
475 static struct p9_req_t *
476 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
477 {
478 va_list ap;
479 int tag, err;
480 struct p9_req_t *req;
481 unsigned long flags;
482 int sigpending;
483
484 P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
485
486 if (c->status != Connected)
487 return ERR_PTR(-EIO);
488
489 if (signal_pending(current)) {
490 sigpending = 1;
491 clear_thread_flag(TIF_SIGPENDING);
492 } else
493 sigpending = 0;
494
495 tag = P9_NOTAG;
496 if (type != P9_TVERSION) {
497 tag = p9_idpool_get(c->tagpool);
498 if (tag < 0)
499 return ERR_PTR(-ENOMEM);
500 }
501
502 req = p9_tag_alloc(c, tag);
503 if (IS_ERR(req))
504 return req;
505
506 /* marshall the data */
507 p9pdu_prepare(req->tc, tag, type);
508 va_start(ap, fmt);
509 err = p9pdu_vwritef(req->tc, c->dotu, fmt, ap);
510 va_end(ap);
511 p9pdu_finalize(req->tc);
512
513 err = c->trans_mod->request(c, req);
514 if (err < 0) {
515 c->status = Disconnected;
516 goto reterr;
517 }
518
519 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag);
520 err = wait_event_interruptible(*req->wq,
521 req->status >= REQ_STATUS_RCVD);
522 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n",
523 req->wq, tag, err);
524
525 if (req->status == REQ_STATUS_ERROR) {
526 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
527 err = req->t_err;
528 }
529
530 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
531 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
532 sigpending = 1;
533 clear_thread_flag(TIF_SIGPENDING);
534
535 if (c->trans_mod->cancel(c, req))
536 p9_client_flush(c, req);
537
538 /* if we received the response anyway, don't signal error */
539 if (req->status == REQ_STATUS_RCVD)
540 err = 0;
541 }
542
543 if (sigpending) {
544 spin_lock_irqsave(&current->sighand->siglock, flags);
545 recalc_sigpending();
546 spin_unlock_irqrestore(&current->sighand->siglock, flags);
547 }
548
549 if (err < 0)
550 goto reterr;
551
552 err = p9_check_errors(c, req);
553 if (!err) {
554 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
555 return req;
556 }
557
558 reterr:
559 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
560 err);
561 p9_free_req(c, req);
562 return ERR_PTR(err);
563 }
564
565 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
566 {
567 int ret;
568 struct p9_fid *fid;
569 unsigned long flags;
570
571 P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
572 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
573 if (!fid)
574 return ERR_PTR(-ENOMEM);
575
576 ret = p9_idpool_get(clnt->fidpool);
577 if (ret < 0) {
578 ret = -ENOSPC;
579 goto error;
580 }
581 fid->fid = ret;
582
583 memset(&fid->qid, 0, sizeof(struct p9_qid));
584 fid->mode = -1;
585 fid->rdir_fpos = 0;
586 fid->uid = current_fsuid();
587 fid->clnt = clnt;
588 fid->aux = NULL;
589
590 spin_lock_irqsave(&clnt->lock, flags);
591 list_add(&fid->flist, &clnt->fidlist);
592 spin_unlock_irqrestore(&clnt->lock, flags);
593
594 return fid;
595
596 error:
597 kfree(fid);
598 return ERR_PTR(ret);
599 }
600
601 static void p9_fid_destroy(struct p9_fid *fid)
602 {
603 struct p9_client *clnt;
604 unsigned long flags;
605
606 P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
607 clnt = fid->clnt;
608 p9_idpool_put(fid->fid, clnt->fidpool);
609 spin_lock_irqsave(&clnt->lock, flags);
610 list_del(&fid->flist);
611 spin_unlock_irqrestore(&clnt->lock, flags);
612 kfree(fid);
613 }
614
615 int p9_client_version(struct p9_client *c)
616 {
617 int err = 0;
618 struct p9_req_t *req;
619 char *version;
620 int msize;
621
622 P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d extended %d\n",
623 c->msize, c->dotu);
624 req = p9_client_rpc(c, P9_TVERSION, "ds", c->msize,
625 c->dotu ? "9P2000.u" : "9P2000");
626 if (IS_ERR(req))
627 return PTR_ERR(req);
628
629 err = p9pdu_readf(req->rc, c->dotu, "ds", &msize, &version);
630 if (err) {
631 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
632 p9pdu_dump(1, req->rc);
633 goto error;
634 }
635
636 P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
637 if (!memcmp(version, "9P2000.u", 8))
638 c->dotu = 1;
639 else if (!memcmp(version, "9P2000", 6))
640 c->dotu = 0;
641 else {
642 err = -EREMOTEIO;
643 goto error;
644 }
645
646 if (msize < c->msize)
647 c->msize = msize;
648
649 error:
650 kfree(version);
651 p9_free_req(c, req);
652
653 return err;
654 }
655 EXPORT_SYMBOL(p9_client_version);
656
657 struct p9_client *p9_client_create(const char *dev_name, char *options)
658 {
659 int err;
660 struct p9_client *clnt;
661
662 err = 0;
663 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
664 if (!clnt)
665 return ERR_PTR(-ENOMEM);
666
667 clnt->trans_mod = NULL;
668 clnt->trans = NULL;
669 spin_lock_init(&clnt->lock);
670 INIT_LIST_HEAD(&clnt->fidlist);
671 clnt->fidpool = p9_idpool_create();
672 if (IS_ERR(clnt->fidpool)) {
673 err = PTR_ERR(clnt->fidpool);
674 clnt->fidpool = NULL;
675 goto error;
676 }
677
678 p9_tag_init(clnt);
679
680 err = parse_opts(options, clnt);
681 if (err < 0)
682 goto error;
683
684 if (!clnt->trans_mod)
685 clnt->trans_mod = v9fs_get_default_trans();
686
687 if (clnt->trans_mod == NULL) {
688 err = -EPROTONOSUPPORT;
689 P9_DPRINTK(P9_DEBUG_ERROR,
690 "No transport defined or default transport\n");
691 goto error;
692 }
693
694 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d dotu %d\n",
695 clnt, clnt->trans_mod, clnt->msize, clnt->dotu);
696
697 err = clnt->trans_mod->create(clnt, dev_name, options);
698 if (err)
699 goto error;
700
701 if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize)
702 clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ;
703
704 err = p9_client_version(clnt);
705 if (err)
706 goto error;
707
708 return clnt;
709
710 error:
711 p9_client_destroy(clnt);
712 return ERR_PTR(err);
713 }
714 EXPORT_SYMBOL(p9_client_create);
715
716 void p9_client_destroy(struct p9_client *clnt)
717 {
718 struct p9_fid *fid, *fidptr;
719
720 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt);
721
722 if (clnt->trans_mod)
723 clnt->trans_mod->close(clnt);
724
725 v9fs_put_trans(clnt->trans_mod);
726
727 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist)
728 p9_fid_destroy(fid);
729
730 if (clnt->fidpool)
731 p9_idpool_destroy(clnt->fidpool);
732
733 p9_tag_cleanup(clnt);
734
735 kfree(clnt);
736 }
737 EXPORT_SYMBOL(p9_client_destroy);
738
739 void p9_client_disconnect(struct p9_client *clnt)
740 {
741 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
742 clnt->status = Disconnected;
743 }
744 EXPORT_SYMBOL(p9_client_disconnect);
745
746 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
747 char *uname, u32 n_uname, char *aname)
748 {
749 int err;
750 struct p9_req_t *req;
751 struct p9_fid *fid;
752 struct p9_qid qid;
753
754 P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
755 afid ? afid->fid : -1, uname, aname);
756 err = 0;
757
758 fid = p9_fid_create(clnt);
759 if (IS_ERR(fid)) {
760 err = PTR_ERR(fid);
761 fid = NULL;
762 goto error;
763 }
764
765 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
766 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
767 if (IS_ERR(req)) {
768 err = PTR_ERR(req);
769 goto error;
770 }
771
772 err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid);
773 if (err) {
774 p9pdu_dump(1, req->rc);
775 p9_free_req(clnt, req);
776 goto error;
777 }
778
779 P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
780 qid.type,
781 (unsigned long long)qid.path,
782 qid.version);
783
784 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
785
786 p9_free_req(clnt, req);
787 return fid;
788
789 error:
790 if (fid)
791 p9_fid_destroy(fid);
792 return ERR_PTR(err);
793 }
794 EXPORT_SYMBOL(p9_client_attach);
795
796 struct p9_fid *
797 p9_client_auth(struct p9_client *clnt, char *uname, u32 n_uname, char *aname)
798 {
799 int err;
800 struct p9_req_t *req;
801 struct p9_qid qid;
802 struct p9_fid *afid;
803
804 P9_DPRINTK(P9_DEBUG_9P, ">>> TAUTH uname %s aname %s\n", uname, aname);
805 err = 0;
806
807 afid = p9_fid_create(clnt);
808 if (IS_ERR(afid)) {
809 err = PTR_ERR(afid);
810 afid = NULL;
811 goto error;
812 }
813
814 req = p9_client_rpc(clnt, P9_TAUTH, "dss?d",
815 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
816 if (IS_ERR(req)) {
817 err = PTR_ERR(req);
818 goto error;
819 }
820
821 err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid);
822 if (err) {
823 p9pdu_dump(1, req->rc);
824 p9_free_req(clnt, req);
825 goto error;
826 }
827
828 P9_DPRINTK(P9_DEBUG_9P, "<<< RAUTH qid %x.%llx.%x\n",
829 qid.type,
830 (unsigned long long)qid.path,
831 qid.version);
832
833 memmove(&afid->qid, &qid, sizeof(struct p9_qid));
834 p9_free_req(clnt, req);
835 return afid;
836
837 error:
838 if (afid)
839 p9_fid_destroy(afid);
840 return ERR_PTR(err);
841 }
842 EXPORT_SYMBOL(p9_client_auth);
843
844 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
845 int clone)
846 {
847 int err;
848 struct p9_client *clnt;
849 struct p9_fid *fid;
850 struct p9_qid *wqids;
851 struct p9_req_t *req;
852 int16_t nwqids, count;
853
854 err = 0;
855 clnt = oldfid->clnt;
856 if (clone) {
857 fid = p9_fid_create(clnt);
858 if (IS_ERR(fid)) {
859 err = PTR_ERR(fid);
860 fid = NULL;
861 goto error;
862 }
863
864 fid->uid = oldfid->uid;
865 } else
866 fid = oldfid;
867
868
869 P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n",
870 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
871
872 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
873 nwname, wnames);
874 if (IS_ERR(req)) {
875 err = PTR_ERR(req);
876 goto error;
877 }
878
879 err = p9pdu_readf(req->rc, clnt->dotu, "R", &nwqids, &wqids);
880 if (err) {
881 p9pdu_dump(1, req->rc);
882 p9_free_req(clnt, req);
883 goto clunk_fid;
884 }
885 p9_free_req(clnt, req);
886
887 P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
888
889 if (nwqids != nwname) {
890 err = -ENOENT;
891 goto clunk_fid;
892 }
893
894 for (count = 0; count < nwqids; count++)
895 P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
896 count, wqids[count].type,
897 (unsigned long long)wqids[count].path,
898 wqids[count].version);
899
900 if (nwname)
901 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
902 else
903 fid->qid = oldfid->qid;
904
905 return fid;
906
907 clunk_fid:
908 p9_client_clunk(fid);
909 fid = NULL;
910
911 error:
912 if (fid && (fid != oldfid))
913 p9_fid_destroy(fid);
914
915 return ERR_PTR(err);
916 }
917 EXPORT_SYMBOL(p9_client_walk);
918
919 int p9_client_open(struct p9_fid *fid, int mode)
920 {
921 int err;
922 struct p9_client *clnt;
923 struct p9_req_t *req;
924 struct p9_qid qid;
925 int iounit;
926
927 P9_DPRINTK(P9_DEBUG_9P, ">>> TOPEN fid %d mode %d\n", fid->fid, mode);
928 err = 0;
929 clnt = fid->clnt;
930
931 if (fid->mode != -1)
932 return -EINVAL;
933
934 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
935 if (IS_ERR(req)) {
936 err = PTR_ERR(req);
937 goto error;
938 }
939
940 err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit);
941 if (err) {
942 p9pdu_dump(1, req->rc);
943 goto free_and_error;
944 }
945
946 P9_DPRINTK(P9_DEBUG_9P, "<<< ROPEN qid %x.%llx.%x iounit %x\n",
947 qid.type,
948 (unsigned long long)qid.path,
949 qid.version, iounit);
950
951 fid->mode = mode;
952 fid->iounit = iounit;
953
954 free_and_error:
955 p9_free_req(clnt, req);
956 error:
957 return err;
958 }
959 EXPORT_SYMBOL(p9_client_open);
960
961 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
962 char *extension)
963 {
964 int err;
965 struct p9_client *clnt;
966 struct p9_req_t *req;
967 struct p9_qid qid;
968 int iounit;
969
970 P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
971 fid->fid, name, perm, mode);
972 err = 0;
973 clnt = fid->clnt;
974
975 if (fid->mode != -1)
976 return -EINVAL;
977
978 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
979 mode, extension);
980 if (IS_ERR(req)) {
981 err = PTR_ERR(req);
982 goto error;
983 }
984
985 err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit);
986 if (err) {
987 p9pdu_dump(1, req->rc);
988 goto free_and_error;
989 }
990
991 P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
992 qid.type,
993 (unsigned long long)qid.path,
994 qid.version, iounit);
995
996 fid->mode = mode;
997 fid->iounit = iounit;
998
999 free_and_error:
1000 p9_free_req(clnt, req);
1001 error:
1002 return err;
1003 }
1004 EXPORT_SYMBOL(p9_client_fcreate);
1005
1006 int p9_client_clunk(struct p9_fid *fid)
1007 {
1008 int err;
1009 struct p9_client *clnt;
1010 struct p9_req_t *req;
1011
1012 P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
1013 err = 0;
1014 clnt = fid->clnt;
1015
1016 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1017 if (IS_ERR(req)) {
1018 err = PTR_ERR(req);
1019 goto error;
1020 }
1021
1022 P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1023
1024 p9_free_req(clnt, req);
1025 p9_fid_destroy(fid);
1026
1027 error:
1028 return err;
1029 }
1030 EXPORT_SYMBOL(p9_client_clunk);
1031
1032 int p9_client_remove(struct p9_fid *fid)
1033 {
1034 int err;
1035 struct p9_client *clnt;
1036 struct p9_req_t *req;
1037
1038 P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1039 err = 0;
1040 clnt = fid->clnt;
1041
1042 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1043 if (IS_ERR(req)) {
1044 err = PTR_ERR(req);
1045 goto error;
1046 }
1047
1048 P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1049
1050 p9_free_req(clnt, req);
1051 p9_fid_destroy(fid);
1052
1053 error:
1054 return err;
1055 }
1056 EXPORT_SYMBOL(p9_client_remove);
1057
1058 int
1059 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1060 u32 count)
1061 {
1062 int err, rsize, total;
1063 struct p9_client *clnt;
1064 struct p9_req_t *req;
1065 char *dataptr;
1066
1067 P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid,
1068 (long long unsigned) offset, count);
1069 err = 0;
1070 clnt = fid->clnt;
1071 total = 0;
1072
1073 rsize = fid->iounit;
1074 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1075 rsize = clnt->msize - P9_IOHDRSZ;
1076
1077 if (count < rsize)
1078 rsize = count;
1079
1080 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, rsize);
1081 if (IS_ERR(req)) {
1082 err = PTR_ERR(req);
1083 goto error;
1084 }
1085
1086 err = p9pdu_readf(req->rc, clnt->dotu, "D", &count, &dataptr);
1087 if (err) {
1088 p9pdu_dump(1, req->rc);
1089 goto free_and_error;
1090 }
1091
1092 P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1093
1094 if (data) {
1095 memmove(data, dataptr, count);
1096 }
1097
1098 if (udata) {
1099 err = copy_to_user(udata, dataptr, count);
1100 if (err) {
1101 err = -EFAULT;
1102 goto free_and_error;
1103 }
1104 }
1105
1106 p9_free_req(clnt, req);
1107 return count;
1108
1109 free_and_error:
1110 p9_free_req(clnt, req);
1111 error:
1112 return err;
1113 }
1114 EXPORT_SYMBOL(p9_client_read);
1115
1116 int
1117 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1118 u64 offset, u32 count)
1119 {
1120 int err, rsize, total;
1121 struct p9_client *clnt;
1122 struct p9_req_t *req;
1123
1124 P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1125 fid->fid, (long long unsigned) offset, count);
1126 err = 0;
1127 clnt = fid->clnt;
1128 total = 0;
1129
1130 rsize = fid->iounit;
1131 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1132 rsize = clnt->msize - P9_IOHDRSZ;
1133
1134 if (count < rsize)
1135 rsize = count;
1136 if (data)
1137 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, offset,
1138 rsize, data);
1139 else
1140 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, offset,
1141 rsize, udata);
1142 if (IS_ERR(req)) {
1143 err = PTR_ERR(req);
1144 goto error;
1145 }
1146
1147 err = p9pdu_readf(req->rc, clnt->dotu, "d", &count);
1148 if (err) {
1149 p9pdu_dump(1, req->rc);
1150 goto free_and_error;
1151 }
1152
1153 P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1154
1155 p9_free_req(clnt, req);
1156 return count;
1157
1158 free_and_error:
1159 p9_free_req(clnt, req);
1160 error:
1161 return err;
1162 }
1163 EXPORT_SYMBOL(p9_client_write);
1164
1165 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1166 {
1167 int err;
1168 struct p9_client *clnt;
1169 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1170 struct p9_req_t *req;
1171 u16 ignored;
1172
1173 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1174
1175 if (!ret)
1176 return ERR_PTR(-ENOMEM);
1177
1178 err = 0;
1179 clnt = fid->clnt;
1180
1181 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1182 if (IS_ERR(req)) {
1183 err = PTR_ERR(req);
1184 goto error;
1185 }
1186
1187 err = p9pdu_readf(req->rc, clnt->dotu, "wS", &ignored, ret);
1188 if (err) {
1189 p9pdu_dump(1, req->rc);
1190 p9_free_req(clnt, req);
1191 goto error;
1192 }
1193
1194 P9_DPRINTK(P9_DEBUG_9P,
1195 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1196 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1197 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1198 "<<< uid=%d gid=%d n_muid=%d\n",
1199 ret->size, ret->type, ret->dev, ret->qid.type,
1200 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1201 ret->atime, ret->mtime, (unsigned long long)ret->length,
1202 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1203 ret->n_uid, ret->n_gid, ret->n_muid);
1204
1205 p9_free_req(clnt, req);
1206 return ret;
1207
1208 error:
1209 kfree(ret);
1210 return ERR_PTR(err);
1211 }
1212 EXPORT_SYMBOL(p9_client_stat);
1213
1214 static int p9_client_statsize(struct p9_wstat *wst, int optional)
1215 {
1216 int ret;
1217
1218 /* size[2] type[2] dev[4] qid[13] */
1219 /* mode[4] atime[4] mtime[4] length[8]*/
1220 /* name[s] uid[s] gid[s] muid[s] */
1221 ret = 2+2+4+13+4+4+4+8+2+2+2+2;
1222
1223 if (wst->name)
1224 ret += strlen(wst->name);
1225 if (wst->uid)
1226 ret += strlen(wst->uid);
1227 if (wst->gid)
1228 ret += strlen(wst->gid);
1229 if (wst->muid)
1230 ret += strlen(wst->muid);
1231
1232 if (optional) {
1233 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1234 if (wst->extension)
1235 ret += strlen(wst->extension);
1236 }
1237
1238 return ret;
1239 }
1240
1241 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1242 {
1243 int err;
1244 struct p9_req_t *req;
1245 struct p9_client *clnt;
1246
1247 err = 0;
1248 clnt = fid->clnt;
1249 wst->size = p9_client_statsize(wst, clnt->dotu);
1250 P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1251 P9_DPRINTK(P9_DEBUG_9P,
1252 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1253 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1254 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1255 " uid=%d gid=%d n_muid=%d\n",
1256 wst->size, wst->type, wst->dev, wst->qid.type,
1257 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1258 wst->atime, wst->mtime, (unsigned long long)wst->length,
1259 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1260 wst->n_uid, wst->n_gid, wst->n_muid);
1261
1262 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size, wst);
1263 if (IS_ERR(req)) {
1264 err = PTR_ERR(req);
1265 goto error;
1266 }
1267
1268 P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1269
1270 p9_free_req(clnt, req);
1271 error:
1272 return err;
1273 }
1274 EXPORT_SYMBOL(p9_client_wstat);
Linux with added FPC-III support