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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit...
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / 9p / client.c
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/slab.h>
33 #include <linux/sched.h>
34 #include <linux/uaccess.h>
35 #include <net/9p/9p.h>
36 #include <linux/parser.h>
37 #include <net/9p/client.h>
38 #include <net/9p/transport.h>
39 #include "protocol.h"
40
41 /*
42 * Client Option Parsing (code inspired by NFS code)
43 * - a little lazy - parse all client options
44 */
45
46 enum {
47 Opt_msize,
48 Opt_trans,
49 Opt_legacy,
50 Opt_version,
51 Opt_err,
52 };
53
54 static const match_table_t tokens = {
55 {Opt_msize, "msize=%u"},
56 {Opt_legacy, "noextend"},
57 {Opt_trans, "trans=%s"},
58 {Opt_version, "version=%s"},
59 {Opt_err, NULL},
60 };
61
62 inline int p9_is_proto_dotl(struct p9_client *clnt)
63 {
64 return (clnt->proto_version == p9_proto_2000L);
65 }
66 EXPORT_SYMBOL(p9_is_proto_dotl);
67
68 inline int p9_is_proto_dotu(struct p9_client *clnt)
69 {
70 return (clnt->proto_version == p9_proto_2000u);
71 }
72 EXPORT_SYMBOL(p9_is_proto_dotu);
73
74 /* Interpret mount option for protocol version */
75 static unsigned char get_protocol_version(const substring_t *name)
76 {
77 unsigned char version = -EINVAL;
78 if (!strncmp("9p2000", name->from, name->to-name->from)) {
79 version = p9_proto_legacy;
80 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: Legacy\n");
81 } else if (!strncmp("9p2000.u", name->from, name->to-name->from)) {
82 version = p9_proto_2000u;
83 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
84 } else if (!strncmp("9p2000.L", name->from, name->to-name->from)) {
85 version = p9_proto_2000L;
86 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
87 } else {
88 P9_DPRINTK(P9_DEBUG_ERROR, "Unknown protocol version %s. ",
89 name->from);
90 }
91 return version;
92 }
93
94 static struct p9_req_t *
95 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
96
97 /**
98 * parse_options - parse mount options into client structure
99 * @opts: options string passed from mount
100 * @clnt: existing v9fs client information
101 *
102 * Return 0 upon success, -ERRNO upon failure
103 */
104
105 static int parse_opts(char *opts, struct p9_client *clnt)
106 {
107 char *options, *tmp_options;
108 char *p;
109 substring_t args[MAX_OPT_ARGS];
110 int option;
111 int ret = 0;
112
113 clnt->proto_version = p9_proto_2000u;
114 clnt->msize = 8192;
115
116 if (!opts)
117 return 0;
118
119 tmp_options = kstrdup(opts, GFP_KERNEL);
120 if (!tmp_options) {
121 P9_DPRINTK(P9_DEBUG_ERROR,
122 "failed to allocate copy of option string\n");
123 return -ENOMEM;
124 }
125 options = tmp_options;
126
127 while ((p = strsep(&options, ",")) != NULL) {
128 int token;
129 if (!*p)
130 continue;
131 token = match_token(p, tokens, args);
132 if (token < Opt_trans) {
133 int r = match_int(&args[0], &option);
134 if (r < 0) {
135 P9_DPRINTK(P9_DEBUG_ERROR,
136 "integer field, but no integer?\n");
137 ret = r;
138 continue;
139 }
140 }
141 switch (token) {
142 case Opt_msize:
143 clnt->msize = option;
144 break;
145 case Opt_trans:
146 clnt->trans_mod = v9fs_get_trans_by_name(&args[0]);
147 if(clnt->trans_mod == NULL) {
148 P9_DPRINTK(P9_DEBUG_ERROR,
149 "Could not find request transport: %s\n",
150 (char *) &args[0]);
151 ret = -EINVAL;
152 goto free_and_return;
153 }
154 break;
155 case Opt_legacy:
156 clnt->proto_version = p9_proto_legacy;
157 break;
158 case Opt_version:
159 ret = get_protocol_version(&args[0]);
160 if (ret == -EINVAL)
161 goto free_and_return;
162 clnt->proto_version = ret;
163 break;
164 default:
165 continue;
166 }
167 }
168
169 free_and_return:
170 kfree(tmp_options);
171 return ret;
172 }
173
174 /**
175 * p9_tag_alloc - lookup/allocate a request by tag
176 * @c: client session to lookup tag within
177 * @tag: numeric id for transaction
178 *
179 * this is a simple array lookup, but will grow the
180 * request_slots as necessary to accomodate transaction
181 * ids which did not previously have a slot.
182 *
183 * this code relies on the client spinlock to manage locks, its
184 * possible we should switch to something else, but I'd rather
185 * stick with something low-overhead for the common case.
186 *
187 */
188
189 static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag)
190 {
191 unsigned long flags;
192 int row, col;
193 struct p9_req_t *req;
194
195 /* This looks up the original request by tag so we know which
196 * buffer to read the data into */
197 tag++;
198
199 if (tag >= c->max_tag) {
200 spin_lock_irqsave(&c->lock, flags);
201 /* check again since original check was outside of lock */
202 while (tag >= c->max_tag) {
203 row = (tag / P9_ROW_MAXTAG);
204 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
205 sizeof(struct p9_req_t), GFP_ATOMIC);
206
207 if (!c->reqs[row]) {
208 printk(KERN_ERR "Couldn't grow tag array\n");
209 spin_unlock_irqrestore(&c->lock, flags);
210 return ERR_PTR(-ENOMEM);
211 }
212 for (col = 0; col < P9_ROW_MAXTAG; col++) {
213 c->reqs[row][col].status = REQ_STATUS_IDLE;
214 c->reqs[row][col].tc = NULL;
215 }
216 c->max_tag += P9_ROW_MAXTAG;
217 }
218 spin_unlock_irqrestore(&c->lock, flags);
219 }
220 row = tag / P9_ROW_MAXTAG;
221 col = tag % P9_ROW_MAXTAG;
222
223 req = &c->reqs[row][col];
224 if (!req->tc) {
225 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_KERNEL);
226 if (!req->wq) {
227 printk(KERN_ERR "Couldn't grow tag array\n");
228 return ERR_PTR(-ENOMEM);
229 }
230 init_waitqueue_head(req->wq);
231 req->tc = kmalloc(sizeof(struct p9_fcall)+c->msize,
232 GFP_KERNEL);
233 req->rc = kmalloc(sizeof(struct p9_fcall)+c->msize,
234 GFP_KERNEL);
235 if ((!req->tc) || (!req->rc)) {
236 printk(KERN_ERR "Couldn't grow tag array\n");
237 kfree(req->tc);
238 kfree(req->rc);
239 kfree(req->wq);
240 req->tc = req->rc = NULL;
241 req->wq = NULL;
242 return ERR_PTR(-ENOMEM);
243 }
244 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
245 req->tc->capacity = c->msize;
246 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
247 req->rc->capacity = c->msize;
248 }
249
250 p9pdu_reset(req->tc);
251 p9pdu_reset(req->rc);
252
253 req->tc->tag = tag-1;
254 req->status = REQ_STATUS_ALLOC;
255
256 return &c->reqs[row][col];
257 }
258
259 /**
260 * p9_tag_lookup - lookup a request by tag
261 * @c: client session to lookup tag within
262 * @tag: numeric id for transaction
263 *
264 */
265
266 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
267 {
268 int row, col;
269
270 /* This looks up the original request by tag so we know which
271 * buffer to read the data into */
272 tag++;
273
274 BUG_ON(tag >= c->max_tag);
275
276 row = tag / P9_ROW_MAXTAG;
277 col = tag % P9_ROW_MAXTAG;
278
279 return &c->reqs[row][col];
280 }
281 EXPORT_SYMBOL(p9_tag_lookup);
282
283 /**
284 * p9_tag_init - setup tags structure and contents
285 * @c: v9fs client struct
286 *
287 * This initializes the tags structure for each client instance.
288 *
289 */
290
291 static int p9_tag_init(struct p9_client *c)
292 {
293 int err = 0;
294
295 c->tagpool = p9_idpool_create();
296 if (IS_ERR(c->tagpool)) {
297 err = PTR_ERR(c->tagpool);
298 c->tagpool = NULL;
299 goto error;
300 }
301
302 p9_idpool_get(c->tagpool); /* reserve tag 0 */
303
304 c->max_tag = 0;
305 error:
306 return err;
307 }
308
309 /**
310 * p9_tag_cleanup - cleans up tags structure and reclaims resources
311 * @c: v9fs client struct
312 *
313 * This frees resources associated with the tags structure
314 *
315 */
316 static void p9_tag_cleanup(struct p9_client *c)
317 {
318 int row, col;
319
320 /* check to insure all requests are idle */
321 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
322 for (col = 0; col < P9_ROW_MAXTAG; col++) {
323 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
324 P9_DPRINTK(P9_DEBUG_MUX,
325 "Attempting to cleanup non-free tag %d,%d\n",
326 row, col);
327 /* TODO: delay execution of cleanup */
328 return;
329 }
330 }
331 }
332
333 if (c->tagpool)
334 p9_idpool_destroy(c->tagpool);
335
336 /* free requests associated with tags */
337 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
338 for (col = 0; col < P9_ROW_MAXTAG; col++) {
339 kfree(c->reqs[row][col].wq);
340 kfree(c->reqs[row][col].tc);
341 kfree(c->reqs[row][col].rc);
342 }
343 kfree(c->reqs[row]);
344 }
345 c->max_tag = 0;
346 }
347
348 /**
349 * p9_free_req - free a request and clean-up as necessary
350 * c: client state
351 * r: request to release
352 *
353 */
354
355 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
356 {
357 int tag = r->tc->tag;
358 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
359
360 r->status = REQ_STATUS_IDLE;
361 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
362 p9_idpool_put(tag, c->tagpool);
363 }
364
365 /**
366 * p9_client_cb - call back from transport to client
367 * c: client state
368 * req: request received
369 *
370 */
371 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
372 {
373 P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
374 wake_up(req->wq);
375 P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
376 }
377 EXPORT_SYMBOL(p9_client_cb);
378
379 /**
380 * p9_parse_header - parse header arguments out of a packet
381 * @pdu: packet to parse
382 * @size: size of packet
383 * @type: type of request
384 * @tag: tag of packet
385 * @rewind: set if we need to rewind offset afterwards
386 */
387
388 int
389 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
390 int rewind)
391 {
392 int8_t r_type;
393 int16_t r_tag;
394 int32_t r_size;
395 int offset = pdu->offset;
396 int err;
397
398 pdu->offset = 0;
399 if (pdu->size == 0)
400 pdu->size = 7;
401
402 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
403 if (err)
404 goto rewind_and_exit;
405
406 pdu->size = r_size;
407 pdu->id = r_type;
408 pdu->tag = r_tag;
409
410 P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size,
411 pdu->id, pdu->tag);
412
413 if (type)
414 *type = r_type;
415 if (tag)
416 *tag = r_tag;
417 if (size)
418 *size = r_size;
419
420
421 rewind_and_exit:
422 if (rewind)
423 pdu->offset = offset;
424 return err;
425 }
426 EXPORT_SYMBOL(p9_parse_header);
427
428 /**
429 * p9_check_errors - check 9p packet for error return and process it
430 * @c: current client instance
431 * @req: request to parse and check for error conditions
432 *
433 * returns error code if one is discovered, otherwise returns 0
434 *
435 * this will have to be more complicated if we have multiple
436 * error packet types
437 */
438
439 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
440 {
441 int8_t type;
442 int err;
443
444 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
445 if (err) {
446 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
447 return err;
448 }
449
450 if (type == P9_RERROR) {
451 int ecode;
452 char *ename;
453
454 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
455 &ename, &ecode);
456 if (err) {
457 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n",
458 err);
459 return err;
460 }
461
462 if (p9_is_proto_dotu(c))
463 err = -ecode;
464
465 if (!err || !IS_ERR_VALUE(err))
466 err = p9_errstr2errno(ename, strlen(ename));
467
468 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode, ename);
469
470 kfree(ename);
471 } else
472 err = 0;
473
474 return err;
475 }
476
477 /**
478 * p9_client_flush - flush (cancel) a request
479 * @c: client state
480 * @oldreq: request to cancel
481 *
482 * This sents a flush for a particular requests and links
483 * the flush request to the original request. The current
484 * code only supports a single flush request although the protocol
485 * allows for multiple flush requests to be sent for a single request.
486 *
487 */
488
489 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
490 {
491 struct p9_req_t *req;
492 int16_t oldtag;
493 int err;
494
495 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
496 if (err)
497 return err;
498
499 P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
500
501 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
502 if (IS_ERR(req))
503 return PTR_ERR(req);
504
505
506 /* if we haven't received a response for oldreq,
507 remove it from the list. */
508 spin_lock(&c->lock);
509 if (oldreq->status == REQ_STATUS_FLSH)
510 list_del(&oldreq->req_list);
511 spin_unlock(&c->lock);
512
513 p9_free_req(c, req);
514 return 0;
515 }
516
517 /**
518 * p9_client_rpc - issue a request and wait for a response
519 * @c: client session
520 * @type: type of request
521 * @fmt: protocol format string (see protocol.c)
522 *
523 * Returns request structure (which client must free using p9_free_req)
524 */
525
526 static struct p9_req_t *
527 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
528 {
529 va_list ap;
530 int tag, err;
531 struct p9_req_t *req;
532 unsigned long flags;
533 int sigpending;
534
535 P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
536
537 if (c->status != Connected)
538 return ERR_PTR(-EIO);
539
540 if (signal_pending(current)) {
541 sigpending = 1;
542 clear_thread_flag(TIF_SIGPENDING);
543 } else
544 sigpending = 0;
545
546 tag = P9_NOTAG;
547 if (type != P9_TVERSION) {
548 tag = p9_idpool_get(c->tagpool);
549 if (tag < 0)
550 return ERR_PTR(-ENOMEM);
551 }
552
553 req = p9_tag_alloc(c, tag);
554 if (IS_ERR(req))
555 return req;
556
557 /* marshall the data */
558 p9pdu_prepare(req->tc, tag, type);
559 va_start(ap, fmt);
560 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
561 va_end(ap);
562 p9pdu_finalize(req->tc);
563
564 err = c->trans_mod->request(c, req);
565 if (err < 0) {
566 c->status = Disconnected;
567 goto reterr;
568 }
569
570 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag);
571 err = wait_event_interruptible(*req->wq,
572 req->status >= REQ_STATUS_RCVD);
573 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n",
574 req->wq, tag, err);
575
576 if (req->status == REQ_STATUS_ERROR) {
577 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
578 err = req->t_err;
579 }
580
581 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
582 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
583 sigpending = 1;
584 clear_thread_flag(TIF_SIGPENDING);
585
586 if (c->trans_mod->cancel(c, req))
587 p9_client_flush(c, req);
588
589 /* if we received the response anyway, don't signal error */
590 if (req->status == REQ_STATUS_RCVD)
591 err = 0;
592 }
593
594 if (sigpending) {
595 spin_lock_irqsave(&current->sighand->siglock, flags);
596 recalc_sigpending();
597 spin_unlock_irqrestore(&current->sighand->siglock, flags);
598 }
599
600 if (err < 0)
601 goto reterr;
602
603 err = p9_check_errors(c, req);
604 if (!err) {
605 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
606 return req;
607 }
608
609 reterr:
610 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
611 err);
612 p9_free_req(c, req);
613 return ERR_PTR(err);
614 }
615
616 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
617 {
618 int ret;
619 struct p9_fid *fid;
620 unsigned long flags;
621
622 P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
623 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
624 if (!fid)
625 return ERR_PTR(-ENOMEM);
626
627 ret = p9_idpool_get(clnt->fidpool);
628 if (ret < 0) {
629 ret = -ENOSPC;
630 goto error;
631 }
632 fid->fid = ret;
633
634 memset(&fid->qid, 0, sizeof(struct p9_qid));
635 fid->mode = -1;
636 fid->uid = current_fsuid();
637 fid->clnt = clnt;
638 fid->rdir = NULL;
639 spin_lock_irqsave(&clnt->lock, flags);
640 list_add(&fid->flist, &clnt->fidlist);
641 spin_unlock_irqrestore(&clnt->lock, flags);
642
643 return fid;
644
645 error:
646 kfree(fid);
647 return ERR_PTR(ret);
648 }
649
650 static void p9_fid_destroy(struct p9_fid *fid)
651 {
652 struct p9_client *clnt;
653 unsigned long flags;
654
655 P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
656 clnt = fid->clnt;
657 p9_idpool_put(fid->fid, clnt->fidpool);
658 spin_lock_irqsave(&clnt->lock, flags);
659 list_del(&fid->flist);
660 spin_unlock_irqrestore(&clnt->lock, flags);
661 kfree(fid->rdir);
662 kfree(fid);
663 }
664
665 int p9_client_version(struct p9_client *c)
666 {
667 int err = 0;
668 struct p9_req_t *req;
669 char *version;
670 int msize;
671
672 P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
673 c->msize, c->proto_version);
674
675 switch (c->proto_version) {
676 case p9_proto_2000L:
677 req = p9_client_rpc(c, P9_TVERSION, "ds",
678 c->msize, "9P2000.L");
679 break;
680 case p9_proto_2000u:
681 req = p9_client_rpc(c, P9_TVERSION, "ds",
682 c->msize, "9P2000.u");
683 break;
684 case p9_proto_legacy:
685 req = p9_client_rpc(c, P9_TVERSION, "ds",
686 c->msize, "9P2000");
687 break;
688 default:
689 return -EINVAL;
690 break;
691 }
692
693 if (IS_ERR(req))
694 return PTR_ERR(req);
695
696 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
697 if (err) {
698 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
699 p9pdu_dump(1, req->rc);
700 goto error;
701 }
702
703 P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
704 if (!strncmp(version, "9P2000.L", 8))
705 c->proto_version = p9_proto_2000L;
706 else if (!strncmp(version, "9P2000.u", 8))
707 c->proto_version = p9_proto_2000u;
708 else if (!strncmp(version, "9P2000", 6))
709 c->proto_version = p9_proto_legacy;
710 else {
711 err = -EREMOTEIO;
712 goto error;
713 }
714
715 if (msize < c->msize)
716 c->msize = msize;
717
718 error:
719 kfree(version);
720 p9_free_req(c, req);
721
722 return err;
723 }
724 EXPORT_SYMBOL(p9_client_version);
725
726 struct p9_client *p9_client_create(const char *dev_name, char *options)
727 {
728 int err;
729 struct p9_client *clnt;
730
731 err = 0;
732 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
733 if (!clnt)
734 return ERR_PTR(-ENOMEM);
735
736 clnt->trans_mod = NULL;
737 clnt->trans = NULL;
738 spin_lock_init(&clnt->lock);
739 INIT_LIST_HEAD(&clnt->fidlist);
740
741 p9_tag_init(clnt);
742
743 err = parse_opts(options, clnt);
744 if (err < 0)
745 goto free_client;
746
747 if (!clnt->trans_mod)
748 clnt->trans_mod = v9fs_get_default_trans();
749
750 if (clnt->trans_mod == NULL) {
751 err = -EPROTONOSUPPORT;
752 P9_DPRINTK(P9_DEBUG_ERROR,
753 "No transport defined or default transport\n");
754 goto free_client;
755 }
756
757 clnt->fidpool = p9_idpool_create();
758 if (IS_ERR(clnt->fidpool)) {
759 err = PTR_ERR(clnt->fidpool);
760 clnt->fidpool = NULL;
761 goto put_trans;
762 }
763
764 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
765 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
766
767 err = clnt->trans_mod->create(clnt, dev_name, options);
768 if (err)
769 goto destroy_fidpool;
770
771 if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize)
772 clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ;
773
774 err = p9_client_version(clnt);
775 if (err)
776 goto close_trans;
777
778 return clnt;
779
780 close_trans:
781 clnt->trans_mod->close(clnt);
782 destroy_fidpool:
783 p9_idpool_destroy(clnt->fidpool);
784 put_trans:
785 v9fs_put_trans(clnt->trans_mod);
786 free_client:
787 kfree(clnt);
788 return ERR_PTR(err);
789 }
790 EXPORT_SYMBOL(p9_client_create);
791
792 void p9_client_destroy(struct p9_client *clnt)
793 {
794 struct p9_fid *fid, *fidptr;
795
796 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt);
797
798 if (clnt->trans_mod)
799 clnt->trans_mod->close(clnt);
800
801 v9fs_put_trans(clnt->trans_mod);
802
803 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist)
804 p9_fid_destroy(fid);
805
806 if (clnt->fidpool)
807 p9_idpool_destroy(clnt->fidpool);
808
809 p9_tag_cleanup(clnt);
810
811 kfree(clnt);
812 }
813 EXPORT_SYMBOL(p9_client_destroy);
814
815 void p9_client_disconnect(struct p9_client *clnt)
816 {
817 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
818 clnt->status = Disconnected;
819 }
820 EXPORT_SYMBOL(p9_client_disconnect);
821
822 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
823 char *uname, u32 n_uname, char *aname)
824 {
825 int err;
826 struct p9_req_t *req;
827 struct p9_fid *fid;
828 struct p9_qid qid;
829
830 P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
831 afid ? afid->fid : -1, uname, aname);
832 err = 0;
833
834 fid = p9_fid_create(clnt);
835 if (IS_ERR(fid)) {
836 err = PTR_ERR(fid);
837 fid = NULL;
838 goto error;
839 }
840
841 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
842 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
843 if (IS_ERR(req)) {
844 err = PTR_ERR(req);
845 goto error;
846 }
847
848 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
849 if (err) {
850 p9pdu_dump(1, req->rc);
851 p9_free_req(clnt, req);
852 goto error;
853 }
854
855 P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
856 qid.type,
857 (unsigned long long)qid.path,
858 qid.version);
859
860 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
861
862 p9_free_req(clnt, req);
863 return fid;
864
865 error:
866 if (fid)
867 p9_fid_destroy(fid);
868 return ERR_PTR(err);
869 }
870 EXPORT_SYMBOL(p9_client_attach);
871
872 struct p9_fid *
873 p9_client_auth(struct p9_client *clnt, char *uname, u32 n_uname, char *aname)
874 {
875 int err;
876 struct p9_req_t *req;
877 struct p9_qid qid;
878 struct p9_fid *afid;
879
880 P9_DPRINTK(P9_DEBUG_9P, ">>> TAUTH uname %s aname %s\n", uname, aname);
881 err = 0;
882
883 afid = p9_fid_create(clnt);
884 if (IS_ERR(afid)) {
885 err = PTR_ERR(afid);
886 afid = NULL;
887 goto error;
888 }
889
890 req = p9_client_rpc(clnt, P9_TAUTH, "dss?d",
891 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
892 if (IS_ERR(req)) {
893 err = PTR_ERR(req);
894 goto error;
895 }
896
897 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
898 if (err) {
899 p9pdu_dump(1, req->rc);
900 p9_free_req(clnt, req);
901 goto error;
902 }
903
904 P9_DPRINTK(P9_DEBUG_9P, "<<< RAUTH qid %x.%llx.%x\n",
905 qid.type,
906 (unsigned long long)qid.path,
907 qid.version);
908
909 memmove(&afid->qid, &qid, sizeof(struct p9_qid));
910 p9_free_req(clnt, req);
911 return afid;
912
913 error:
914 if (afid)
915 p9_fid_destroy(afid);
916 return ERR_PTR(err);
917 }
918 EXPORT_SYMBOL(p9_client_auth);
919
920 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
921 int clone)
922 {
923 int err;
924 struct p9_client *clnt;
925 struct p9_fid *fid;
926 struct p9_qid *wqids;
927 struct p9_req_t *req;
928 int16_t nwqids, count;
929
930 err = 0;
931 clnt = oldfid->clnt;
932 if (clone) {
933 fid = p9_fid_create(clnt);
934 if (IS_ERR(fid)) {
935 err = PTR_ERR(fid);
936 fid = NULL;
937 goto error;
938 }
939
940 fid->uid = oldfid->uid;
941 } else
942 fid = oldfid;
943
944
945 P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n",
946 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
947
948 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
949 nwname, wnames);
950 if (IS_ERR(req)) {
951 err = PTR_ERR(req);
952 goto error;
953 }
954
955 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
956 if (err) {
957 p9pdu_dump(1, req->rc);
958 p9_free_req(clnt, req);
959 goto clunk_fid;
960 }
961 p9_free_req(clnt, req);
962
963 P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
964
965 if (nwqids != nwname) {
966 err = -ENOENT;
967 goto clunk_fid;
968 }
969
970 for (count = 0; count < nwqids; count++)
971 P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
972 count, wqids[count].type,
973 (unsigned long long)wqids[count].path,
974 wqids[count].version);
975
976 if (nwname)
977 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
978 else
979 fid->qid = oldfid->qid;
980
981 return fid;
982
983 clunk_fid:
984 p9_client_clunk(fid);
985 fid = NULL;
986
987 error:
988 if (fid && (fid != oldfid))
989 p9_fid_destroy(fid);
990
991 return ERR_PTR(err);
992 }
993 EXPORT_SYMBOL(p9_client_walk);
994
995 int p9_client_open(struct p9_fid *fid, int mode)
996 {
997 int err;
998 struct p9_client *clnt;
999 struct p9_req_t *req;
1000 struct p9_qid qid;
1001 int iounit;
1002
1003 P9_DPRINTK(P9_DEBUG_9P, ">>> TOPEN fid %d mode %d\n", fid->fid, mode);
1004 err = 0;
1005 clnt = fid->clnt;
1006
1007 if (fid->mode != -1)
1008 return -EINVAL;
1009
1010 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1011 if (IS_ERR(req)) {
1012 err = PTR_ERR(req);
1013 goto error;
1014 }
1015
1016 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1017 if (err) {
1018 p9pdu_dump(1, req->rc);
1019 goto free_and_error;
1020 }
1021
1022 P9_DPRINTK(P9_DEBUG_9P, "<<< ROPEN qid %x.%llx.%x iounit %x\n",
1023 qid.type,
1024 (unsigned long long)qid.path,
1025 qid.version, iounit);
1026
1027 fid->mode = mode;
1028 fid->iounit = iounit;
1029
1030 free_and_error:
1031 p9_free_req(clnt, req);
1032 error:
1033 return err;
1034 }
1035 EXPORT_SYMBOL(p9_client_open);
1036
1037 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1038 char *extension)
1039 {
1040 int err;
1041 struct p9_client *clnt;
1042 struct p9_req_t *req;
1043 struct p9_qid qid;
1044 int iounit;
1045
1046 P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1047 fid->fid, name, perm, mode);
1048 err = 0;
1049 clnt = fid->clnt;
1050
1051 if (fid->mode != -1)
1052 return -EINVAL;
1053
1054 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1055 mode, extension);
1056 if (IS_ERR(req)) {
1057 err = PTR_ERR(req);
1058 goto error;
1059 }
1060
1061 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1062 if (err) {
1063 p9pdu_dump(1, req->rc);
1064 goto free_and_error;
1065 }
1066
1067 P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1068 qid.type,
1069 (unsigned long long)qid.path,
1070 qid.version, iounit);
1071
1072 fid->mode = mode;
1073 fid->iounit = iounit;
1074
1075 free_and_error:
1076 p9_free_req(clnt, req);
1077 error:
1078 return err;
1079 }
1080 EXPORT_SYMBOL(p9_client_fcreate);
1081
1082 int p9_client_clunk(struct p9_fid *fid)
1083 {
1084 int err;
1085 struct p9_client *clnt;
1086 struct p9_req_t *req;
1087
1088 P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
1089 err = 0;
1090 clnt = fid->clnt;
1091
1092 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1093 if (IS_ERR(req)) {
1094 err = PTR_ERR(req);
1095 goto error;
1096 }
1097
1098 P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1099
1100 p9_free_req(clnt, req);
1101 p9_fid_destroy(fid);
1102
1103 error:
1104 return err;
1105 }
1106 EXPORT_SYMBOL(p9_client_clunk);
1107
1108 int p9_client_remove(struct p9_fid *fid)
1109 {
1110 int err;
1111 struct p9_client *clnt;
1112 struct p9_req_t *req;
1113
1114 P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1115 err = 0;
1116 clnt = fid->clnt;
1117
1118 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1119 if (IS_ERR(req)) {
1120 err = PTR_ERR(req);
1121 goto error;
1122 }
1123
1124 P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1125
1126 p9_free_req(clnt, req);
1127 p9_fid_destroy(fid);
1128
1129 error:
1130 return err;
1131 }
1132 EXPORT_SYMBOL(p9_client_remove);
1133
1134 int
1135 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1136 u32 count)
1137 {
1138 int err, rsize, total;
1139 struct p9_client *clnt;
1140 struct p9_req_t *req;
1141 char *dataptr;
1142
1143 P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid,
1144 (long long unsigned) offset, count);
1145 err = 0;
1146 clnt = fid->clnt;
1147 total = 0;
1148
1149 rsize = fid->iounit;
1150 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1151 rsize = clnt->msize - P9_IOHDRSZ;
1152
1153 if (count < rsize)
1154 rsize = count;
1155
1156 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, rsize);
1157 if (IS_ERR(req)) {
1158 err = PTR_ERR(req);
1159 goto error;
1160 }
1161
1162 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1163 if (err) {
1164 p9pdu_dump(1, req->rc);
1165 goto free_and_error;
1166 }
1167
1168 P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1169
1170 if (data) {
1171 memmove(data, dataptr, count);
1172 }
1173
1174 if (udata) {
1175 err = copy_to_user(udata, dataptr, count);
1176 if (err) {
1177 err = -EFAULT;
1178 goto free_and_error;
1179 }
1180 }
1181
1182 p9_free_req(clnt, req);
1183 return count;
1184
1185 free_and_error:
1186 p9_free_req(clnt, req);
1187 error:
1188 return err;
1189 }
1190 EXPORT_SYMBOL(p9_client_read);
1191
1192 int
1193 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1194 u64 offset, u32 count)
1195 {
1196 int err, rsize, total;
1197 struct p9_client *clnt;
1198 struct p9_req_t *req;
1199
1200 P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1201 fid->fid, (long long unsigned) offset, count);
1202 err = 0;
1203 clnt = fid->clnt;
1204 total = 0;
1205
1206 rsize = fid->iounit;
1207 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1208 rsize = clnt->msize - P9_IOHDRSZ;
1209
1210 if (count < rsize)
1211 rsize = count;
1212 if (data)
1213 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, offset,
1214 rsize, data);
1215 else
1216 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, offset,
1217 rsize, udata);
1218 if (IS_ERR(req)) {
1219 err = PTR_ERR(req);
1220 goto error;
1221 }
1222
1223 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1224 if (err) {
1225 p9pdu_dump(1, req->rc);
1226 goto free_and_error;
1227 }
1228
1229 P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1230
1231 p9_free_req(clnt, req);
1232 return count;
1233
1234 free_and_error:
1235 p9_free_req(clnt, req);
1236 error:
1237 return err;
1238 }
1239 EXPORT_SYMBOL(p9_client_write);
1240
1241 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1242 {
1243 int err;
1244 struct p9_client *clnt;
1245 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1246 struct p9_req_t *req;
1247 u16 ignored;
1248
1249 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1250
1251 if (!ret)
1252 return ERR_PTR(-ENOMEM);
1253
1254 err = 0;
1255 clnt = fid->clnt;
1256
1257 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1258 if (IS_ERR(req)) {
1259 err = PTR_ERR(req);
1260 goto error;
1261 }
1262
1263 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1264 if (err) {
1265 p9pdu_dump(1, req->rc);
1266 p9_free_req(clnt, req);
1267 goto error;
1268 }
1269
1270 P9_DPRINTK(P9_DEBUG_9P,
1271 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1272 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1273 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1274 "<<< uid=%d gid=%d n_muid=%d\n",
1275 ret->size, ret->type, ret->dev, ret->qid.type,
1276 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1277 ret->atime, ret->mtime, (unsigned long long)ret->length,
1278 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1279 ret->n_uid, ret->n_gid, ret->n_muid);
1280
1281 p9_free_req(clnt, req);
1282 return ret;
1283
1284 error:
1285 kfree(ret);
1286 return ERR_PTR(err);
1287 }
1288 EXPORT_SYMBOL(p9_client_stat);
1289
1290 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1291 {
1292 int ret;
1293
1294 /* NOTE: size shouldn't include its own length */
1295 /* size[2] type[2] dev[4] qid[13] */
1296 /* mode[4] atime[4] mtime[4] length[8]*/
1297 /* name[s] uid[s] gid[s] muid[s] */
1298 ret = 2+4+13+4+4+4+8+2+2+2+2;
1299
1300 if (wst->name)
1301 ret += strlen(wst->name);
1302 if (wst->uid)
1303 ret += strlen(wst->uid);
1304 if (wst->gid)
1305 ret += strlen(wst->gid);
1306 if (wst->muid)
1307 ret += strlen(wst->muid);
1308
1309 if (proto_version == p9_proto_2000u) {
1310 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1311 if (wst->extension)
1312 ret += strlen(wst->extension);
1313 }
1314
1315 return ret;
1316 }
1317
1318 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1319 {
1320 int err;
1321 struct p9_req_t *req;
1322 struct p9_client *clnt;
1323
1324 err = 0;
1325 clnt = fid->clnt;
1326 wst->size = p9_client_statsize(wst, clnt->proto_version);
1327 P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1328 P9_DPRINTK(P9_DEBUG_9P,
1329 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1330 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1331 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1332 " uid=%d gid=%d n_muid=%d\n",
1333 wst->size, wst->type, wst->dev, wst->qid.type,
1334 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1335 wst->atime, wst->mtime, (unsigned long long)wst->length,
1336 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1337 wst->n_uid, wst->n_gid, wst->n_muid);
1338
1339 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1340 if (IS_ERR(req)) {
1341 err = PTR_ERR(req);
1342 goto error;
1343 }
1344
1345 P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1346
1347 p9_free_req(clnt, req);
1348 error:
1349 return err;
1350 }
1351 EXPORT_SYMBOL(p9_client_wstat);
kernel source for telekom puls (alcatel/mediatek)