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AT91: board-sam9m10g45ek.c: Remove duplicate inclusion of mach/hardware.h
[zen-stable.git] / net / 9p / client.c
bloba848bca9fbffcd89e659e0d998bf830b83920765
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 int get_protocol_version(const substring_t *name)
76 {
77 int version = -EINVAL;
78
79 if (!strncmp("9p2000", name->from, name->to-name->from)) {
80 version = p9_proto_legacy;
81 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: Legacy\n");
82 } else if (!strncmp("9p2000.u", name->from, name->to-name->from)) {
83 version = p9_proto_2000u;
84 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
85 } else if (!strncmp("9p2000.L", name->from, name->to-name->from)) {
86 version = p9_proto_2000L;
87 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
88 } else {
89 P9_DPRINTK(P9_DEBUG_ERROR, "Unknown protocol version %s. ",
90 name->from);
91 }
92 return version;
93 }
94
95 static struct p9_req_t *
96 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
97
98 /**
99 * parse_options - parse mount options into client structure
100 * @opts: options string passed from mount
101 * @clnt: existing v9fs client information
102 *
103 * Return 0 upon success, -ERRNO upon failure
104 */
105
106 static int parse_opts(char *opts, struct p9_client *clnt)
107 {
108 char *options, *tmp_options;
109 char *p;
110 substring_t args[MAX_OPT_ARGS];
111 int option;
112 int ret = 0;
113
114 clnt->proto_version = p9_proto_2000u;
115 clnt->msize = 8192;
116
117 if (!opts)
118 return 0;
119
120 tmp_options = kstrdup(opts, GFP_KERNEL);
121 if (!tmp_options) {
122 P9_DPRINTK(P9_DEBUG_ERROR,
123 "failed to allocate copy of option string\n");
124 return -ENOMEM;
125 }
126 options = tmp_options;
127
128 while ((p = strsep(&options, ",")) != NULL) {
129 int token;
130 if (!*p)
131 continue;
132 token = match_token(p, tokens, args);
133 if (token < Opt_trans) {
134 int r = match_int(&args[0], &option);
135 if (r < 0) {
136 P9_DPRINTK(P9_DEBUG_ERROR,
137 "integer field, but no integer?\n");
138 ret = r;
139 continue;
140 }
141 }
142 switch (token) {
143 case Opt_msize:
144 clnt->msize = option;
145 break;
146 case Opt_trans:
147 clnt->trans_mod = v9fs_get_trans_by_name(&args[0]);
148 if(clnt->trans_mod == NULL) {
149 P9_DPRINTK(P9_DEBUG_ERROR,
150 "Could not find request transport: %s\n",
151 (char *) &args[0]);
152 ret = -EINVAL;
153 goto free_and_return;
154 }
155 break;
156 case Opt_legacy:
157 clnt->proto_version = p9_proto_legacy;
158 break;
159 case Opt_version:
160 ret = get_protocol_version(&args[0]);
161 if (ret == -EINVAL)
162 goto free_and_return;
163 clnt->proto_version = ret;
164 break;
165 default:
166 continue;
167 }
168 }
169
170 free_and_return:
171 kfree(tmp_options);
172 return ret;
173 }
174
175 /**
176 * p9_tag_alloc - lookup/allocate a request by tag
177 * @c: client session to lookup tag within
178 * @tag: numeric id for transaction
179 *
180 * this is a simple array lookup, but will grow the
181 * request_slots as necessary to accomodate transaction
182 * ids which did not previously have a slot.
183 *
184 * this code relies on the client spinlock to manage locks, its
185 * possible we should switch to something else, but I'd rather
186 * stick with something low-overhead for the common case.
187 *
188 */
189
190 static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag)
191 {
192 unsigned long flags;
193 int row, col;
194 struct p9_req_t *req;
195
196 /* This looks up the original request by tag so we know which
197 * buffer to read the data into */
198 tag++;
199
200 if (tag >= c->max_tag) {
201 spin_lock_irqsave(&c->lock, flags);
202 /* check again since original check was outside of lock */
203 while (tag >= c->max_tag) {
204 row = (tag / P9_ROW_MAXTAG);
205 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
206 sizeof(struct p9_req_t), GFP_ATOMIC);
207
208 if (!c->reqs[row]) {
209 printk(KERN_ERR "Couldn't grow tag array\n");
210 spin_unlock_irqrestore(&c->lock, flags);
211 return ERR_PTR(-ENOMEM);
212 }
213 for (col = 0; col < P9_ROW_MAXTAG; col++) {
214 c->reqs[row][col].status = REQ_STATUS_IDLE;
215 c->reqs[row][col].tc = NULL;
216 }
217 c->max_tag += P9_ROW_MAXTAG;
218 }
219 spin_unlock_irqrestore(&c->lock, flags);
220 }
221 row = tag / P9_ROW_MAXTAG;
222 col = tag % P9_ROW_MAXTAG;
223
224 req = &c->reqs[row][col];
225 if (!req->tc) {
226 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_KERNEL);
227 if (!req->wq) {
228 printk(KERN_ERR "Couldn't grow tag array\n");
229 return ERR_PTR(-ENOMEM);
230 }
231 init_waitqueue_head(req->wq);
232 req->tc = kmalloc(sizeof(struct p9_fcall)+c->msize,
233 GFP_KERNEL);
234 req->rc = kmalloc(sizeof(struct p9_fcall)+c->msize,
235 GFP_KERNEL);
236 if ((!req->tc) || (!req->rc)) {
237 printk(KERN_ERR "Couldn't grow tag array\n");
238 kfree(req->tc);
239 kfree(req->rc);
240 kfree(req->wq);
241 req->tc = req->rc = NULL;
242 req->wq = NULL;
243 return ERR_PTR(-ENOMEM);
244 }
245 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
246 req->tc->capacity = c->msize;
247 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
248 req->rc->capacity = c->msize;
249 }
250
251 p9pdu_reset(req->tc);
252 p9pdu_reset(req->rc);
253
254 req->tc->tag = tag-1;
255 req->status = REQ_STATUS_ALLOC;
256
257 return &c->reqs[row][col];
258 }
259
260 /**
261 * p9_tag_lookup - lookup a request by tag
262 * @c: client session to lookup tag within
263 * @tag: numeric id for transaction
264 *
265 */
266
267 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
268 {
269 int row, col;
270
271 /* This looks up the original request by tag so we know which
272 * buffer to read the data into */
273 tag++;
274
275 BUG_ON(tag >= c->max_tag);
276
277 row = tag / P9_ROW_MAXTAG;
278 col = tag % P9_ROW_MAXTAG;
279
280 return &c->reqs[row][col];
281 }
282 EXPORT_SYMBOL(p9_tag_lookup);
283
284 /**
285 * p9_tag_init - setup tags structure and contents
286 * @c: v9fs client struct
287 *
288 * This initializes the tags structure for each client instance.
289 *
290 */
291
292 static int p9_tag_init(struct p9_client *c)
293 {
294 int err = 0;
295
296 c->tagpool = p9_idpool_create();
297 if (IS_ERR(c->tagpool)) {
298 err = PTR_ERR(c->tagpool);
299 c->tagpool = NULL;
300 goto error;
301 }
302
303 p9_idpool_get(c->tagpool); /* reserve tag 0 */
304
305 c->max_tag = 0;
306 error:
307 return err;
308 }
309
310 /**
311 * p9_tag_cleanup - cleans up tags structure and reclaims resources
312 * @c: v9fs client struct
313 *
314 * This frees resources associated with the tags structure
315 *
316 */
317 static void p9_tag_cleanup(struct p9_client *c)
318 {
319 int row, col;
320
321 /* check to insure all requests are idle */
322 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
323 for (col = 0; col < P9_ROW_MAXTAG; col++) {
324 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
325 P9_DPRINTK(P9_DEBUG_MUX,
326 "Attempting to cleanup non-free tag %d,%d\n",
327 row, col);
328 /* TODO: delay execution of cleanup */
329 return;
330 }
331 }
332 }
333
334 if (c->tagpool) {
335 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
336 p9_idpool_destroy(c->tagpool);
337 }
338
339 /* free requests associated with tags */
340 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
341 for (col = 0; col < P9_ROW_MAXTAG; col++) {
342 kfree(c->reqs[row][col].wq);
343 kfree(c->reqs[row][col].tc);
344 kfree(c->reqs[row][col].rc);
345 }
346 kfree(c->reqs[row]);
347 }
348 c->max_tag = 0;
349 }
350
351 /**
352 * p9_free_req - free a request and clean-up as necessary
353 * c: client state
354 * r: request to release
355 *
356 */
357
358 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
359 {
360 int tag = r->tc->tag;
361 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
362
363 r->status = REQ_STATUS_IDLE;
364 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
365 p9_idpool_put(tag, c->tagpool);
366 }
367
368 /**
369 * p9_client_cb - call back from transport to client
370 * c: client state
371 * req: request received
372 *
373 */
374 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
375 {
376 P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
377 wake_up(req->wq);
378 P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
379 }
380 EXPORT_SYMBOL(p9_client_cb);
381
382 /**
383 * p9_parse_header - parse header arguments out of a packet
384 * @pdu: packet to parse
385 * @size: size of packet
386 * @type: type of request
387 * @tag: tag of packet
388 * @rewind: set if we need to rewind offset afterwards
389 */
390
391 int
392 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
393 int rewind)
394 {
395 int8_t r_type;
396 int16_t r_tag;
397 int32_t r_size;
398 int offset = pdu->offset;
399 int err;
400
401 pdu->offset = 0;
402 if (pdu->size == 0)
403 pdu->size = 7;
404
405 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
406 if (err)
407 goto rewind_and_exit;
408
409 pdu->size = r_size;
410 pdu->id = r_type;
411 pdu->tag = r_tag;
412
413 P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size,
414 pdu->id, pdu->tag);
415
416 if (type)
417 *type = r_type;
418 if (tag)
419 *tag = r_tag;
420 if (size)
421 *size = r_size;
422
423
424 rewind_and_exit:
425 if (rewind)
426 pdu->offset = offset;
427 return err;
428 }
429 EXPORT_SYMBOL(p9_parse_header);
430
431 /**
432 * p9_check_errors - check 9p packet for error return and process it
433 * @c: current client instance
434 * @req: request to parse and check for error conditions
435 *
436 * returns error code if one is discovered, otherwise returns 0
437 *
438 * this will have to be more complicated if we have multiple
439 * error packet types
440 */
441
442 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
443 {
444 int8_t type;
445 int err;
446
447 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
448 if (err) {
449 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
450 return err;
451 }
452
453 if (type == P9_RERROR || type == P9_RLERROR) {
454 int ecode;
455
456 if (!p9_is_proto_dotl(c)) {
457 char *ename;
458
459 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
460 &ename, &ecode);
461 if (err)
462 goto out_err;
463
464 if (p9_is_proto_dotu(c))
465 err = -ecode;
466
467 if (!err || !IS_ERR_VALUE(err)) {
468 err = p9_errstr2errno(ename, strlen(ename));
469
470 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode, ename);
471
472 kfree(ename);
473 }
474 } else {
475 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
476 err = -ecode;
477
478 P9_DPRINTK(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
479 }
480
481 } else
482 err = 0;
483
484 return err;
485
486 out_err:
487 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
488
489 return err;
490 }
491
492 /**
493 * p9_client_flush - flush (cancel) a request
494 * @c: client state
495 * @oldreq: request to cancel
496 *
497 * This sents a flush for a particular requests and links
498 * the flush request to the original request. The current
499 * code only supports a single flush request although the protocol
500 * allows for multiple flush requests to be sent for a single request.
501 *
502 */
503
504 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
505 {
506 struct p9_req_t *req;
507 int16_t oldtag;
508 int err;
509
510 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
511 if (err)
512 return err;
513
514 P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
515
516 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
517 if (IS_ERR(req))
518 return PTR_ERR(req);
519
520
521 /* if we haven't received a response for oldreq,
522 remove it from the list. */
523 spin_lock(&c->lock);
524 if (oldreq->status == REQ_STATUS_FLSH)
525 list_del(&oldreq->req_list);
526 spin_unlock(&c->lock);
527
528 p9_free_req(c, req);
529 return 0;
530 }
531
532 /**
533 * p9_client_rpc - issue a request and wait for a response
534 * @c: client session
535 * @type: type of request
536 * @fmt: protocol format string (see protocol.c)
537 *
538 * Returns request structure (which client must free using p9_free_req)
539 */
540
541 static struct p9_req_t *
542 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
543 {
544 va_list ap;
545 int tag, err;
546 struct p9_req_t *req;
547 unsigned long flags;
548 int sigpending;
549
550 P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
551
552 /* we allow for any status other than disconnected */
553 if (c->status == Disconnected)
554 return ERR_PTR(-EIO);
555
556 /* if status is begin_disconnected we allow only clunk request */
557 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
558 return ERR_PTR(-EIO);
559
560 if (signal_pending(current)) {
561 sigpending = 1;
562 clear_thread_flag(TIF_SIGPENDING);
563 } else
564 sigpending = 0;
565
566 tag = P9_NOTAG;
567 if (type != P9_TVERSION) {
568 tag = p9_idpool_get(c->tagpool);
569 if (tag < 0)
570 return ERR_PTR(-ENOMEM);
571 }
572
573 req = p9_tag_alloc(c, tag);
574 if (IS_ERR(req))
575 return req;
576
577 /* marshall the data */
578 p9pdu_prepare(req->tc, tag, type);
579 va_start(ap, fmt);
580 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
581 va_end(ap);
582 if (err)
583 goto reterr;
584 p9pdu_finalize(req->tc);
585
586 err = c->trans_mod->request(c, req);
587 if (err < 0) {
588 if (err != -ERESTARTSYS)
589 c->status = Disconnected;
590 goto reterr;
591 }
592
593 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag);
594 err = wait_event_interruptible(*req->wq,
595 req->status >= REQ_STATUS_RCVD);
596 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n",
597 req->wq, tag, err);
598
599 if (req->status == REQ_STATUS_ERROR) {
600 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
601 err = req->t_err;
602 }
603
604 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
605 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
606 sigpending = 1;
607 clear_thread_flag(TIF_SIGPENDING);
608
609 if (c->trans_mod->cancel(c, req))
610 p9_client_flush(c, req);
611
612 /* if we received the response anyway, don't signal error */
613 if (req->status == REQ_STATUS_RCVD)
614 err = 0;
615 }
616
617 if (sigpending) {
618 spin_lock_irqsave(&current->sighand->siglock, flags);
619 recalc_sigpending();
620 spin_unlock_irqrestore(&current->sighand->siglock, flags);
621 }
622
623 if (err < 0)
624 goto reterr;
625
626 err = p9_check_errors(c, req);
627 if (!err) {
628 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
629 return req;
630 }
631
632 reterr:
633 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
634 err);
635 p9_free_req(c, req);
636 return ERR_PTR(err);
637 }
638
639 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
640 {
641 int ret;
642 struct p9_fid *fid;
643 unsigned long flags;
644
645 P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
646 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
647 if (!fid)
648 return ERR_PTR(-ENOMEM);
649
650 ret = p9_idpool_get(clnt->fidpool);
651 if (ret < 0) {
652 ret = -ENOSPC;
653 goto error;
654 }
655 fid->fid = ret;
656
657 memset(&fid->qid, 0, sizeof(struct p9_qid));
658 fid->mode = -1;
659 fid->uid = current_fsuid();
660 fid->clnt = clnt;
661 fid->rdir = NULL;
662 spin_lock_irqsave(&clnt->lock, flags);
663 list_add(&fid->flist, &clnt->fidlist);
664 spin_unlock_irqrestore(&clnt->lock, flags);
665
666 return fid;
667
668 error:
669 kfree(fid);
670 return ERR_PTR(ret);
671 }
672
673 static void p9_fid_destroy(struct p9_fid *fid)
674 {
675 struct p9_client *clnt;
676 unsigned long flags;
677
678 P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
679 clnt = fid->clnt;
680 p9_idpool_put(fid->fid, clnt->fidpool);
681 spin_lock_irqsave(&clnt->lock, flags);
682 list_del(&fid->flist);
683 spin_unlock_irqrestore(&clnt->lock, flags);
684 kfree(fid->rdir);
685 kfree(fid);
686 }
687
688 static int p9_client_version(struct p9_client *c)
689 {
690 int err = 0;
691 struct p9_req_t *req;
692 char *version;
693 int msize;
694
695 P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
696 c->msize, c->proto_version);
697
698 switch (c->proto_version) {
699 case p9_proto_2000L:
700 req = p9_client_rpc(c, P9_TVERSION, "ds",
701 c->msize, "9P2000.L");
702 break;
703 case p9_proto_2000u:
704 req = p9_client_rpc(c, P9_TVERSION, "ds",
705 c->msize, "9P2000.u");
706 break;
707 case p9_proto_legacy:
708 req = p9_client_rpc(c, P9_TVERSION, "ds",
709 c->msize, "9P2000");
710 break;
711 default:
712 return -EINVAL;
713 break;
714 }
715
716 if (IS_ERR(req))
717 return PTR_ERR(req);
718
719 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
720 if (err) {
721 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
722 p9pdu_dump(1, req->rc);
723 goto error;
724 }
725
726 P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
727 if (!strncmp(version, "9P2000.L", 8))
728 c->proto_version = p9_proto_2000L;
729 else if (!strncmp(version, "9P2000.u", 8))
730 c->proto_version = p9_proto_2000u;
731 else if (!strncmp(version, "9P2000", 6))
732 c->proto_version = p9_proto_legacy;
733 else {
734 err = -EREMOTEIO;
735 goto error;
736 }
737
738 if (msize < c->msize)
739 c->msize = msize;
740
741 error:
742 kfree(version);
743 p9_free_req(c, req);
744
745 return err;
746 }
747
748 struct p9_client *p9_client_create(const char *dev_name, char *options)
749 {
750 int err;
751 struct p9_client *clnt;
752
753 err = 0;
754 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
755 if (!clnt)
756 return ERR_PTR(-ENOMEM);
757
758 clnt->trans_mod = NULL;
759 clnt->trans = NULL;
760 spin_lock_init(&clnt->lock);
761 INIT_LIST_HEAD(&clnt->fidlist);
762
763 p9_tag_init(clnt);
764
765 err = parse_opts(options, clnt);
766 if (err < 0)
767 goto free_client;
768
769 if (!clnt->trans_mod)
770 clnt->trans_mod = v9fs_get_default_trans();
771
772 if (clnt->trans_mod == NULL) {
773 err = -EPROTONOSUPPORT;
774 P9_DPRINTK(P9_DEBUG_ERROR,
775 "No transport defined or default transport\n");
776 goto free_client;
777 }
778
779 clnt->fidpool = p9_idpool_create();
780 if (IS_ERR(clnt->fidpool)) {
781 err = PTR_ERR(clnt->fidpool);
782 clnt->fidpool = NULL;
783 goto put_trans;
784 }
785
786 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
787 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
788
789 err = clnt->trans_mod->create(clnt, dev_name, options);
790 if (err)
791 goto destroy_fidpool;
792
793 if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize)
794 clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ;
795
796 err = p9_client_version(clnt);
797 if (err)
798 goto close_trans;
799
800 return clnt;
801
802 close_trans:
803 clnt->trans_mod->close(clnt);
804 destroy_fidpool:
805 p9_idpool_destroy(clnt->fidpool);
806 put_trans:
807 v9fs_put_trans(clnt->trans_mod);
808 free_client:
809 kfree(clnt);
810 return ERR_PTR(err);
811 }
812 EXPORT_SYMBOL(p9_client_create);
813
814 void p9_client_destroy(struct p9_client *clnt)
815 {
816 struct p9_fid *fid, *fidptr;
817
818 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt);
819
820 if (clnt->trans_mod)
821 clnt->trans_mod->close(clnt);
822
823 v9fs_put_trans(clnt->trans_mod);
824
825 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
826 printk(KERN_INFO "Found fid %d not clunked\n", fid->fid);
827 p9_fid_destroy(fid);
828 }
829
830 if (clnt->fidpool)
831 p9_idpool_destroy(clnt->fidpool);
832
833 p9_tag_cleanup(clnt);
834
835 kfree(clnt);
836 }
837 EXPORT_SYMBOL(p9_client_destroy);
838
839 void p9_client_disconnect(struct p9_client *clnt)
840 {
841 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
842 clnt->status = Disconnected;
843 }
844 EXPORT_SYMBOL(p9_client_disconnect);
845
846 void p9_client_begin_disconnect(struct p9_client *clnt)
847 {
848 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
849 clnt->status = BeginDisconnect;
850 }
851 EXPORT_SYMBOL(p9_client_begin_disconnect);
852
853 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
854 char *uname, u32 n_uname, char *aname)
855 {
856 int err;
857 struct p9_req_t *req;
858 struct p9_fid *fid;
859 struct p9_qid qid;
860
861 P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
862 afid ? afid->fid : -1, uname, aname);
863 err = 0;
864
865 fid = p9_fid_create(clnt);
866 if (IS_ERR(fid)) {
867 err = PTR_ERR(fid);
868 fid = NULL;
869 goto error;
870 }
871
872 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
873 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
874 if (IS_ERR(req)) {
875 err = PTR_ERR(req);
876 goto error;
877 }
878
879 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
880 if (err) {
881 p9pdu_dump(1, req->rc);
882 p9_free_req(clnt, req);
883 goto error;
884 }
885
886 P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
887 qid.type,
888 (unsigned long long)qid.path,
889 qid.version);
890
891 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
892
893 p9_free_req(clnt, req);
894 return fid;
895
896 error:
897 if (fid)
898 p9_fid_destroy(fid);
899 return ERR_PTR(err);
900 }
901 EXPORT_SYMBOL(p9_client_attach);
902
903 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
904 int clone)
905 {
906 int err;
907 struct p9_client *clnt;
908 struct p9_fid *fid;
909 struct p9_qid *wqids;
910 struct p9_req_t *req;
911 int16_t nwqids, count;
912
913 err = 0;
914 wqids = NULL;
915 clnt = oldfid->clnt;
916 if (clone) {
917 fid = p9_fid_create(clnt);
918 if (IS_ERR(fid)) {
919 err = PTR_ERR(fid);
920 fid = NULL;
921 goto error;
922 }
923
924 fid->uid = oldfid->uid;
925 } else
926 fid = oldfid;
927
928
929 P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n",
930 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
931
932 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
933 nwname, wnames);
934 if (IS_ERR(req)) {
935 err = PTR_ERR(req);
936 goto error;
937 }
938
939 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
940 if (err) {
941 p9pdu_dump(1, req->rc);
942 p9_free_req(clnt, req);
943 goto clunk_fid;
944 }
945 p9_free_req(clnt, req);
946
947 P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
948
949 if (nwqids != nwname) {
950 err = -ENOENT;
951 goto clunk_fid;
952 }
953
954 for (count = 0; count < nwqids; count++)
955 P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
956 count, wqids[count].type,
957 (unsigned long long)wqids[count].path,
958 wqids[count].version);
959
960 if (nwname)
961 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
962 else
963 fid->qid = oldfid->qid;
964
965 kfree(wqids);
966 return fid;
967
968 clunk_fid:
969 kfree(wqids);
970 p9_client_clunk(fid);
971 fid = NULL;
972
973 error:
974 if (fid && (fid != oldfid))
975 p9_fid_destroy(fid);
976
977 return ERR_PTR(err);
978 }
979 EXPORT_SYMBOL(p9_client_walk);
980
981 int p9_client_open(struct p9_fid *fid, int mode)
982 {
983 int err;
984 struct p9_client *clnt;
985 struct p9_req_t *req;
986 struct p9_qid qid;
987 int iounit;
988
989 clnt = fid->clnt;
990 P9_DPRINTK(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
991 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
992 err = 0;
993
994 if (fid->mode != -1)
995 return -EINVAL;
996
997 if (p9_is_proto_dotl(clnt))
998 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
999 else
1000 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1001 if (IS_ERR(req)) {
1002 err = PTR_ERR(req);
1003 goto error;
1004 }
1005
1006 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1007 if (err) {
1008 p9pdu_dump(1, req->rc);
1009 goto free_and_error;
1010 }
1011
1012 P9_DPRINTK(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1013 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1014 (unsigned long long)qid.path, qid.version, iounit);
1015
1016 fid->mode = mode;
1017 fid->iounit = iounit;
1018
1019 free_and_error:
1020 p9_free_req(clnt, req);
1021 error:
1022 return err;
1023 }
1024 EXPORT_SYMBOL(p9_client_open);
1025
1026 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1027 gid_t gid, struct p9_qid *qid)
1028 {
1029 int err = 0;
1030 struct p9_client *clnt;
1031 struct p9_req_t *req;
1032 int iounit;
1033
1034 P9_DPRINTK(P9_DEBUG_9P,
1035 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1036 ofid->fid, name, flags, mode, gid);
1037 clnt = ofid->clnt;
1038
1039 if (ofid->mode != -1)
1040 return -EINVAL;
1041
1042 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags,
1043 mode, gid);
1044 if (IS_ERR(req)) {
1045 err = PTR_ERR(req);
1046 goto error;
1047 }
1048
1049 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1050 if (err) {
1051 p9pdu_dump(1, req->rc);
1052 goto free_and_error;
1053 }
1054
1055 P9_DPRINTK(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1056 qid->type,
1057 (unsigned long long)qid->path,
1058 qid->version, iounit);
1059
1060 ofid->mode = mode;
1061 ofid->iounit = iounit;
1062
1063 free_and_error:
1064 p9_free_req(clnt, req);
1065 error:
1066 return err;
1067 }
1068 EXPORT_SYMBOL(p9_client_create_dotl);
1069
1070 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1071 char *extension)
1072 {
1073 int err;
1074 struct p9_client *clnt;
1075 struct p9_req_t *req;
1076 struct p9_qid qid;
1077 int iounit;
1078
1079 P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1080 fid->fid, name, perm, mode);
1081 err = 0;
1082 clnt = fid->clnt;
1083
1084 if (fid->mode != -1)
1085 return -EINVAL;
1086
1087 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1088 mode, extension);
1089 if (IS_ERR(req)) {
1090 err = PTR_ERR(req);
1091 goto error;
1092 }
1093
1094 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1095 if (err) {
1096 p9pdu_dump(1, req->rc);
1097 goto free_and_error;
1098 }
1099
1100 P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1101 qid.type,
1102 (unsigned long long)qid.path,
1103 qid.version, iounit);
1104
1105 fid->mode = mode;
1106 fid->iounit = iounit;
1107
1108 free_and_error:
1109 p9_free_req(clnt, req);
1110 error:
1111 return err;
1112 }
1113 EXPORT_SYMBOL(p9_client_fcreate);
1114
1115 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid,
1116 struct p9_qid *qid)
1117 {
1118 int err = 0;
1119 struct p9_client *clnt;
1120 struct p9_req_t *req;
1121
1122 P9_DPRINTK(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1123 dfid->fid, name, symtgt);
1124 clnt = dfid->clnt;
1125
1126 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt,
1127 gid);
1128 if (IS_ERR(req)) {
1129 err = PTR_ERR(req);
1130 goto error;
1131 }
1132
1133 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1134 if (err) {
1135 p9pdu_dump(1, req->rc);
1136 goto free_and_error;
1137 }
1138
1139 P9_DPRINTK(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1140 qid->type, (unsigned long long)qid->path, qid->version);
1141
1142 free_and_error:
1143 p9_free_req(clnt, req);
1144 error:
1145 return err;
1146 }
1147 EXPORT_SYMBOL(p9_client_symlink);
1148
1149 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1150 {
1151 struct p9_client *clnt;
1152 struct p9_req_t *req;
1153
1154 P9_DPRINTK(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1155 dfid->fid, oldfid->fid, newname);
1156 clnt = dfid->clnt;
1157 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1158 newname);
1159 if (IS_ERR(req))
1160 return PTR_ERR(req);
1161
1162 P9_DPRINTK(P9_DEBUG_9P, "<<< RLINK\n");
1163 p9_free_req(clnt, req);
1164 return 0;
1165 }
1166 EXPORT_SYMBOL(p9_client_link);
1167
1168 int p9_client_fsync(struct p9_fid *fid, int datasync)
1169 {
1170 int err;
1171 struct p9_client *clnt;
1172 struct p9_req_t *req;
1173
1174 P9_DPRINTK(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1175 fid->fid, datasync);
1176 err = 0;
1177 clnt = fid->clnt;
1178
1179 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1180 if (IS_ERR(req)) {
1181 err = PTR_ERR(req);
1182 goto error;
1183 }
1184
1185 P9_DPRINTK(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1186
1187 p9_free_req(clnt, req);
1188
1189 error:
1190 return err;
1191 }
1192 EXPORT_SYMBOL(p9_client_fsync);
1193
1194 int p9_client_clunk(struct p9_fid *fid)
1195 {
1196 int err;
1197 struct p9_client *clnt;
1198 struct p9_req_t *req;
1199
1200 if (!fid) {
1201 P9_EPRINTK(KERN_WARNING, "Trying to clunk with NULL fid\n");
1202 dump_stack();
1203 return 0;
1204 }
1205
1206 P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
1207 err = 0;
1208 clnt = fid->clnt;
1209
1210 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1211 if (IS_ERR(req)) {
1212 err = PTR_ERR(req);
1213 goto error;
1214 }
1215
1216 P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1217
1218 p9_free_req(clnt, req);
1219 p9_fid_destroy(fid);
1220
1221 error:
1222 return err;
1223 }
1224 EXPORT_SYMBOL(p9_client_clunk);
1225
1226 int p9_client_remove(struct p9_fid *fid)
1227 {
1228 int err;
1229 struct p9_client *clnt;
1230 struct p9_req_t *req;
1231
1232 P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1233 err = 0;
1234 clnt = fid->clnt;
1235
1236 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1237 if (IS_ERR(req)) {
1238 err = PTR_ERR(req);
1239 goto error;
1240 }
1241
1242 P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1243
1244 p9_free_req(clnt, req);
1245 error:
1246 p9_fid_destroy(fid);
1247 return err;
1248 }
1249 EXPORT_SYMBOL(p9_client_remove);
1250
1251 int
1252 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1253 u32 count)
1254 {
1255 int err, rsize, total;
1256 struct p9_client *clnt;
1257 struct p9_req_t *req;
1258 char *dataptr;
1259
1260 P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid,
1261 (long long unsigned) offset, count);
1262 err = 0;
1263 clnt = fid->clnt;
1264 total = 0;
1265
1266 rsize = fid->iounit;
1267 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1268 rsize = clnt->msize - P9_IOHDRSZ;
1269
1270 if (count < rsize)
1271 rsize = count;
1272
1273 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, rsize);
1274 if (IS_ERR(req)) {
1275 err = PTR_ERR(req);
1276 goto error;
1277 }
1278
1279 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1280 if (err) {
1281 p9pdu_dump(1, req->rc);
1282 goto free_and_error;
1283 }
1284
1285 P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1286
1287 if (data) {
1288 memmove(data, dataptr, count);
1289 } else {
1290 err = copy_to_user(udata, dataptr, count);
1291 if (err) {
1292 err = -EFAULT;
1293 goto free_and_error;
1294 }
1295 }
1296 p9_free_req(clnt, req);
1297 return count;
1298
1299 free_and_error:
1300 p9_free_req(clnt, req);
1301 error:
1302 return err;
1303 }
1304 EXPORT_SYMBOL(p9_client_read);
1305
1306 int
1307 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1308 u64 offset, u32 count)
1309 {
1310 int err, rsize, total;
1311 struct p9_client *clnt;
1312 struct p9_req_t *req;
1313
1314 P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1315 fid->fid, (long long unsigned) offset, count);
1316 err = 0;
1317 clnt = fid->clnt;
1318 total = 0;
1319
1320 rsize = fid->iounit;
1321 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1322 rsize = clnt->msize - P9_IOHDRSZ;
1323
1324 if (count < rsize)
1325 rsize = count;
1326 if (data)
1327 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, offset,
1328 rsize, data);
1329 else
1330 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, offset,
1331 rsize, udata);
1332 if (IS_ERR(req)) {
1333 err = PTR_ERR(req);
1334 goto error;
1335 }
1336
1337 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1338 if (err) {
1339 p9pdu_dump(1, req->rc);
1340 goto free_and_error;
1341 }
1342
1343 P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1344
1345 p9_free_req(clnt, req);
1346 return count;
1347
1348 free_and_error:
1349 p9_free_req(clnt, req);
1350 error:
1351 return err;
1352 }
1353 EXPORT_SYMBOL(p9_client_write);
1354
1355 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1356 {
1357 int err;
1358 struct p9_client *clnt;
1359 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1360 struct p9_req_t *req;
1361 u16 ignored;
1362
1363 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1364
1365 if (!ret)
1366 return ERR_PTR(-ENOMEM);
1367
1368 err = 0;
1369 clnt = fid->clnt;
1370
1371 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1372 if (IS_ERR(req)) {
1373 err = PTR_ERR(req);
1374 goto error;
1375 }
1376
1377 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1378 if (err) {
1379 p9pdu_dump(1, req->rc);
1380 p9_free_req(clnt, req);
1381 goto error;
1382 }
1383
1384 P9_DPRINTK(P9_DEBUG_9P,
1385 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1386 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1387 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1388 "<<< uid=%d gid=%d n_muid=%d\n",
1389 ret->size, ret->type, ret->dev, ret->qid.type,
1390 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1391 ret->atime, ret->mtime, (unsigned long long)ret->length,
1392 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1393 ret->n_uid, ret->n_gid, ret->n_muid);
1394
1395 p9_free_req(clnt, req);
1396 return ret;
1397
1398 error:
1399 kfree(ret);
1400 return ERR_PTR(err);
1401 }
1402 EXPORT_SYMBOL(p9_client_stat);
1403
1404 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1405 u64 request_mask)
1406 {
1407 int err;
1408 struct p9_client *clnt;
1409 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1410 GFP_KERNEL);
1411 struct p9_req_t *req;
1412
1413 P9_DPRINTK(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1414 fid->fid, request_mask);
1415
1416 if (!ret)
1417 return ERR_PTR(-ENOMEM);
1418
1419 err = 0;
1420 clnt = fid->clnt;
1421
1422 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1423 if (IS_ERR(req)) {
1424 err = PTR_ERR(req);
1425 goto error;
1426 }
1427
1428 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1429 if (err) {
1430 p9pdu_dump(1, req->rc);
1431 p9_free_req(clnt, req);
1432 goto error;
1433 }
1434
1435 P9_DPRINTK(P9_DEBUG_9P,
1436 "<<< RGETATTR st_result_mask=%lld\n"
1437 "<<< qid=%x.%llx.%x\n"
1438 "<<< st_mode=%8.8x st_nlink=%llu\n"
1439 "<<< st_uid=%d st_gid=%d\n"
1440 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1441 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1442 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1443 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1444 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1445 "<<< st_gen=%lld st_data_version=%lld",
1446 ret->st_result_mask, ret->qid.type, ret->qid.path,
1447 ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid,
1448 ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize,
1449 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1450 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1451 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1452 ret->st_gen, ret->st_data_version);
1453
1454 p9_free_req(clnt, req);
1455 return ret;
1456
1457 error:
1458 kfree(ret);
1459 return ERR_PTR(err);
1460 }
1461 EXPORT_SYMBOL(p9_client_getattr_dotl);
1462
1463 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1464 {
1465 int ret;
1466
1467 /* NOTE: size shouldn't include its own length */
1468 /* size[2] type[2] dev[4] qid[13] */
1469 /* mode[4] atime[4] mtime[4] length[8]*/
1470 /* name[s] uid[s] gid[s] muid[s] */
1471 ret = 2+4+13+4+4+4+8+2+2+2+2;
1472
1473 if (wst->name)
1474 ret += strlen(wst->name);
1475 if (wst->uid)
1476 ret += strlen(wst->uid);
1477 if (wst->gid)
1478 ret += strlen(wst->gid);
1479 if (wst->muid)
1480 ret += strlen(wst->muid);
1481
1482 if ((proto_version == p9_proto_2000u) ||
1483 (proto_version == p9_proto_2000L)) {
1484 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1485 if (wst->extension)
1486 ret += strlen(wst->extension);
1487 }
1488
1489 return ret;
1490 }
1491
1492 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1493 {
1494 int err;
1495 struct p9_req_t *req;
1496 struct p9_client *clnt;
1497
1498 err = 0;
1499 clnt = fid->clnt;
1500 wst->size = p9_client_statsize(wst, clnt->proto_version);
1501 P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1502 P9_DPRINTK(P9_DEBUG_9P,
1503 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1504 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1505 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1506 " uid=%d gid=%d n_muid=%d\n",
1507 wst->size, wst->type, wst->dev, wst->qid.type,
1508 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1509 wst->atime, wst->mtime, (unsigned long long)wst->length,
1510 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1511 wst->n_uid, wst->n_gid, wst->n_muid);
1512
1513 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1514 if (IS_ERR(req)) {
1515 err = PTR_ERR(req);
1516 goto error;
1517 }
1518
1519 P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1520
1521 p9_free_req(clnt, req);
1522 error:
1523 return err;
1524 }
1525 EXPORT_SYMBOL(p9_client_wstat);
1526
1527 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1528 {
1529 int err;
1530 struct p9_req_t *req;
1531 struct p9_client *clnt;
1532
1533 err = 0;
1534 clnt = fid->clnt;
1535 P9_DPRINTK(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1536 P9_DPRINTK(P9_DEBUG_9P,
1537 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1538 " atime_sec=%lld atime_nsec=%lld\n"
1539 " mtime_sec=%lld mtime_nsec=%lld\n",
1540 p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid,
1541 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1542 p9attr->mtime_sec, p9attr->mtime_nsec);
1543
1544 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1545
1546 if (IS_ERR(req)) {
1547 err = PTR_ERR(req);
1548 goto error;
1549 }
1550 P9_DPRINTK(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1551 p9_free_req(clnt, req);
1552 error:
1553 return err;
1554 }
1555 EXPORT_SYMBOL(p9_client_setattr);
1556
1557 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1558 {
1559 int err;
1560 struct p9_req_t *req;
1561 struct p9_client *clnt;
1562
1563 err = 0;
1564 clnt = fid->clnt;
1565
1566 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1567
1568 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1569 if (IS_ERR(req)) {
1570 err = PTR_ERR(req);
1571 goto error;
1572 }
1573
1574 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1575 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1576 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1577 if (err) {
1578 p9pdu_dump(1, req->rc);
1579 p9_free_req(clnt, req);
1580 goto error;
1581 }
1582
1583 P9_DPRINTK(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1584 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1585 "fsid %llu namelen %ld\n",
1586 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1587 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1588 sb->fsid, (long int)sb->namelen);
1589
1590 p9_free_req(clnt, req);
1591 error:
1592 return err;
1593 }
1594 EXPORT_SYMBOL(p9_client_statfs);
1595
1596 int p9_client_rename(struct p9_fid *fid, struct p9_fid *newdirfid, char *name)
1597 {
1598 int err;
1599 struct p9_req_t *req;
1600 struct p9_client *clnt;
1601
1602 err = 0;
1603 clnt = fid->clnt;
1604
1605 P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1606 fid->fid, newdirfid->fid, name);
1607
1608 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1609 newdirfid->fid, name);
1610 if (IS_ERR(req)) {
1611 err = PTR_ERR(req);
1612 goto error;
1613 }
1614
1615 P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1616
1617 p9_free_req(clnt, req);
1618 error:
1619 return err;
1620 }
1621 EXPORT_SYMBOL(p9_client_rename);
1622
1623 /*
1624 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1625 */
1626 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1627 const char *attr_name, u64 *attr_size)
1628 {
1629 int err;
1630 struct p9_req_t *req;
1631 struct p9_client *clnt;
1632 struct p9_fid *attr_fid;
1633
1634 err = 0;
1635 clnt = file_fid->clnt;
1636 attr_fid = p9_fid_create(clnt);
1637 if (IS_ERR(attr_fid)) {
1638 err = PTR_ERR(attr_fid);
1639 attr_fid = NULL;
1640 goto error;
1641 }
1642 P9_DPRINTK(P9_DEBUG_9P,
1643 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
1644 file_fid->fid, attr_fid->fid, attr_name);
1645
1646 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
1647 file_fid->fid, attr_fid->fid, attr_name);
1648 if (IS_ERR(req)) {
1649 err = PTR_ERR(req);
1650 goto error;
1651 }
1652 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
1653 if (err) {
1654 p9pdu_dump(1, req->rc);
1655 p9_free_req(clnt, req);
1656 goto clunk_fid;
1657 }
1658 p9_free_req(clnt, req);
1659 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
1660 attr_fid->fid, *attr_size);
1661 return attr_fid;
1662 clunk_fid:
1663 p9_client_clunk(attr_fid);
1664 attr_fid = NULL;
1665 error:
1666 if (attr_fid && (attr_fid != file_fid))
1667 p9_fid_destroy(attr_fid);
1668
1669 return ERR_PTR(err);
1670 }
1671 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
1672
1673 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
1674 u64 attr_size, int flags)
1675 {
1676 int err;
1677 struct p9_req_t *req;
1678 struct p9_client *clnt;
1679
1680 P9_DPRINTK(P9_DEBUG_9P,
1681 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
1682 fid->fid, name, (long long)attr_size, flags);
1683 err = 0;
1684 clnt = fid->clnt;
1685 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
1686 fid->fid, name, attr_size, flags);
1687 if (IS_ERR(req)) {
1688 err = PTR_ERR(req);
1689 goto error;
1690 }
1691 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
1692 p9_free_req(clnt, req);
1693 error:
1694 return err;
1695 }
1696 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
1697
1698 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
1699 {
1700 int err, rsize, total;
1701 struct p9_client *clnt;
1702 struct p9_req_t *req;
1703 char *dataptr;
1704
1705 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
1706 fid->fid, (long long unsigned) offset, count);
1707
1708 err = 0;
1709 clnt = fid->clnt;
1710 total = 0;
1711
1712 rsize = fid->iounit;
1713 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
1714 rsize = clnt->msize - P9_READDIRHDRSZ;
1715
1716 if (count < rsize)
1717 rsize = count;
1718
1719 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, offset, rsize);
1720 if (IS_ERR(req)) {
1721 err = PTR_ERR(req);
1722 goto error;
1723 }
1724
1725 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1726 if (err) {
1727 p9pdu_dump(1, req->rc);
1728 goto free_and_error;
1729 }
1730
1731 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
1732
1733 if (data)
1734 memmove(data, dataptr, count);
1735
1736 p9_free_req(clnt, req);
1737 return count;
1738
1739 free_and_error:
1740 p9_free_req(clnt, req);
1741 error:
1742 return err;
1743 }
1744 EXPORT_SYMBOL(p9_client_readdir);
1745
1746 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
1747 dev_t rdev, gid_t gid, struct p9_qid *qid)
1748 {
1749 int err;
1750 struct p9_client *clnt;
1751 struct p9_req_t *req;
1752
1753 err = 0;
1754 clnt = fid->clnt;
1755 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
1756 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
1757 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode,
1758 MAJOR(rdev), MINOR(rdev), gid);
1759 if (IS_ERR(req))
1760 return PTR_ERR(req);
1761
1762 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1763 if (err) {
1764 p9pdu_dump(1, req->rc);
1765 goto error;
1766 }
1767 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
1768 (unsigned long long)qid->path, qid->version);
1769
1770 error:
1771 p9_free_req(clnt, req);
1772 return err;
1773
1774 }
1775 EXPORT_SYMBOL(p9_client_mknod_dotl);
1776
1777 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
1778 gid_t gid, struct p9_qid *qid)
1779 {
1780 int err;
1781 struct p9_client *clnt;
1782 struct p9_req_t *req;
1783
1784 err = 0;
1785 clnt = fid->clnt;
1786 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
1787 fid->fid, name, mode, gid);
1788 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode,
1789 gid);
1790 if (IS_ERR(req))
1791 return PTR_ERR(req);
1792
1793 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1794 if (err) {
1795 p9pdu_dump(1, req->rc);
1796 goto error;
1797 }
1798 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
1799 (unsigned long long)qid->path, qid->version);
1800
1801 error:
1802 p9_free_req(clnt, req);
1803 return err;
1804
1805 }
1806 EXPORT_SYMBOL(p9_client_mkdir_dotl);
1807
1808 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
1809 {
1810 int err;
1811 struct p9_client *clnt;
1812 struct p9_req_t *req;
1813
1814 err = 0;
1815 clnt = fid->clnt;
1816 P9_DPRINTK(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
1817 "start %lld length %lld proc_id %d client_id %s\n",
1818 fid->fid, flock->type, flock->flags, flock->start,
1819 flock->length, flock->proc_id, flock->client_id);
1820
1821 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
1822 flock->flags, flock->start, flock->length,
1823 flock->proc_id, flock->client_id);
1824
1825 if (IS_ERR(req))
1826 return PTR_ERR(req);
1827
1828 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
1829 if (err) {
1830 p9pdu_dump(1, req->rc);
1831 goto error;
1832 }
1833 P9_DPRINTK(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
1834 error:
1835 p9_free_req(clnt, req);
1836 return err;
1837
1838 }
1839 EXPORT_SYMBOL(p9_client_lock_dotl);
1840
1841 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
1842 {
1843 int err;
1844 struct p9_client *clnt;
1845 struct p9_req_t *req;
1846
1847 err = 0;
1848 clnt = fid->clnt;
1849 P9_DPRINTK(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
1850 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
1851 glock->start, glock->length, glock->proc_id, glock->client_id);
1852
1853 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
1854 glock->start, glock->length, glock->proc_id, glock->client_id);
1855
1856 if (IS_ERR(req))
1857 return PTR_ERR(req);
1858
1859 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
1860 &glock->start, &glock->length, &glock->proc_id,
1861 &glock->client_id);
1862 if (err) {
1863 p9pdu_dump(1, req->rc);
1864 goto error;
1865 }
1866 P9_DPRINTK(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
1867 "proc_id %d client_id %s\n", glock->type, glock->start,
1868 glock->length, glock->proc_id, glock->client_id);
1869 error:
1870 p9_free_req(clnt, req);
1871 return err;
1872 }
1873 EXPORT_SYMBOL(p9_client_getlock_dotl);
1874
1875 int p9_client_readlink(struct p9_fid *fid, char **target)
1876 {
1877 int err;
1878 struct p9_client *clnt;
1879 struct p9_req_t *req;
1880
1881 err = 0;
1882 clnt = fid->clnt;
1883 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
1884
1885 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
1886 if (IS_ERR(req))
1887 return PTR_ERR(req);
1888
1889 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
1890 if (err) {
1891 p9pdu_dump(1, req->rc);
1892 goto error;
1893 }
1894 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
1895 error:
1896 p9_free_req(clnt, req);
1897 return err;
1898 }
1899 EXPORT_SYMBOL(p9_client_readlink);