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net/9p: Add a Warning to catch NULL fids passed to p9_client_clunk().
[deliverable/linux.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 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 p9pdu_finalize(req->tc);
583
584 err = c->trans_mod->request(c, req);
585 if (err < 0) {
586 c->status = Disconnected;
587 goto reterr;
588 }
589
590 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag);
591 err = wait_event_interruptible(*req->wq,
592 req->status >= REQ_STATUS_RCVD);
593 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n",
594 req->wq, tag, err);
595
596 if (req->status == REQ_STATUS_ERROR) {
597 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
598 err = req->t_err;
599 }
600
601 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
602 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
603 sigpending = 1;
604 clear_thread_flag(TIF_SIGPENDING);
605
606 if (c->trans_mod->cancel(c, req))
607 p9_client_flush(c, req);
608
609 /* if we received the response anyway, don't signal error */
610 if (req->status == REQ_STATUS_RCVD)
611 err = 0;
612 }
613
614 if (sigpending) {
615 spin_lock_irqsave(&current->sighand->siglock, flags);
616 recalc_sigpending();
617 spin_unlock_irqrestore(&current->sighand->siglock, flags);
618 }
619
620 if (err < 0)
621 goto reterr;
622
623 err = p9_check_errors(c, req);
624 if (!err) {
625 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
626 return req;
627 }
628
629 reterr:
630 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
631 err);
632 p9_free_req(c, req);
633 return ERR_PTR(err);
634 }
635
636 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
637 {
638 int ret;
639 struct p9_fid *fid;
640 unsigned long flags;
641
642 P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
643 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
644 if (!fid)
645 return ERR_PTR(-ENOMEM);
646
647 ret = p9_idpool_get(clnt->fidpool);
648 if (ret < 0) {
649 ret = -ENOSPC;
650 goto error;
651 }
652 fid->fid = ret;
653
654 memset(&fid->qid, 0, sizeof(struct p9_qid));
655 fid->mode = -1;
656 fid->uid = current_fsuid();
657 fid->clnt = clnt;
658 fid->rdir = NULL;
659 spin_lock_irqsave(&clnt->lock, flags);
660 list_add(&fid->flist, &clnt->fidlist);
661 spin_unlock_irqrestore(&clnt->lock, flags);
662
663 return fid;
664
665 error:
666 kfree(fid);
667 return ERR_PTR(ret);
668 }
669
670 static void p9_fid_destroy(struct p9_fid *fid)
671 {
672 struct p9_client *clnt;
673 unsigned long flags;
674
675 P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
676 clnt = fid->clnt;
677 p9_idpool_put(fid->fid, clnt->fidpool);
678 spin_lock_irqsave(&clnt->lock, flags);
679 list_del(&fid->flist);
680 spin_unlock_irqrestore(&clnt->lock, flags);
681 kfree(fid->rdir);
682 kfree(fid);
683 }
684
685 static int p9_client_version(struct p9_client *c)
686 {
687 int err = 0;
688 struct p9_req_t *req;
689 char *version;
690 int msize;
691
692 P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
693 c->msize, c->proto_version);
694
695 switch (c->proto_version) {
696 case p9_proto_2000L:
697 req = p9_client_rpc(c, P9_TVERSION, "ds",
698 c->msize, "9P2000.L");
699 break;
700 case p9_proto_2000u:
701 req = p9_client_rpc(c, P9_TVERSION, "ds",
702 c->msize, "9P2000.u");
703 break;
704 case p9_proto_legacy:
705 req = p9_client_rpc(c, P9_TVERSION, "ds",
706 c->msize, "9P2000");
707 break;
708 default:
709 return -EINVAL;
710 break;
711 }
712
713 if (IS_ERR(req))
714 return PTR_ERR(req);
715
716 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
717 if (err) {
718 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
719 p9pdu_dump(1, req->rc);
720 goto error;
721 }
722
723 P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
724 if (!strncmp(version, "9P2000.L", 8))
725 c->proto_version = p9_proto_2000L;
726 else if (!strncmp(version, "9P2000.u", 8))
727 c->proto_version = p9_proto_2000u;
728 else if (!strncmp(version, "9P2000", 6))
729 c->proto_version = p9_proto_legacy;
730 else {
731 err = -EREMOTEIO;
732 goto error;
733 }
734
735 if (msize < c->msize)
736 c->msize = msize;
737
738 error:
739 kfree(version);
740 p9_free_req(c, req);
741
742 return err;
743 }
744
745 struct p9_client *p9_client_create(const char *dev_name, char *options)
746 {
747 int err;
748 struct p9_client *clnt;
749
750 err = 0;
751 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
752 if (!clnt)
753 return ERR_PTR(-ENOMEM);
754
755 clnt->trans_mod = NULL;
756 clnt->trans = NULL;
757 spin_lock_init(&clnt->lock);
758 INIT_LIST_HEAD(&clnt->fidlist);
759
760 p9_tag_init(clnt);
761
762 err = parse_opts(options, clnt);
763 if (err < 0)
764 goto free_client;
765
766 if (!clnt->trans_mod)
767 clnt->trans_mod = v9fs_get_default_trans();
768
769 if (clnt->trans_mod == NULL) {
770 err = -EPROTONOSUPPORT;
771 P9_DPRINTK(P9_DEBUG_ERROR,
772 "No transport defined or default transport\n");
773 goto free_client;
774 }
775
776 clnt->fidpool = p9_idpool_create();
777 if (IS_ERR(clnt->fidpool)) {
778 err = PTR_ERR(clnt->fidpool);
779 clnt->fidpool = NULL;
780 goto put_trans;
781 }
782
783 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
784 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
785
786 err = clnt->trans_mod->create(clnt, dev_name, options);
787 if (err)
788 goto destroy_fidpool;
789
790 if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize)
791 clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ;
792
793 err = p9_client_version(clnt);
794 if (err)
795 goto close_trans;
796
797 return clnt;
798
799 close_trans:
800 clnt->trans_mod->close(clnt);
801 destroy_fidpool:
802 p9_idpool_destroy(clnt->fidpool);
803 put_trans:
804 v9fs_put_trans(clnt->trans_mod);
805 free_client:
806 kfree(clnt);
807 return ERR_PTR(err);
808 }
809 EXPORT_SYMBOL(p9_client_create);
810
811 void p9_client_destroy(struct p9_client *clnt)
812 {
813 struct p9_fid *fid, *fidptr;
814
815 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt);
816
817 if (clnt->trans_mod)
818 clnt->trans_mod->close(clnt);
819
820 v9fs_put_trans(clnt->trans_mod);
821
822 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
823 printk(KERN_INFO "Found fid %d not clunked\n", fid->fid);
824 p9_fid_destroy(fid);
825 }
826
827 if (clnt->fidpool)
828 p9_idpool_destroy(clnt->fidpool);
829
830 p9_tag_cleanup(clnt);
831
832 kfree(clnt);
833 }
834 EXPORT_SYMBOL(p9_client_destroy);
835
836 void p9_client_disconnect(struct p9_client *clnt)
837 {
838 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
839 clnt->status = Disconnected;
840 }
841 EXPORT_SYMBOL(p9_client_disconnect);
842
843 void p9_client_begin_disconnect(struct p9_client *clnt)
844 {
845 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
846 clnt->status = BeginDisconnect;
847 }
848 EXPORT_SYMBOL(p9_client_begin_disconnect);
849
850 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
851 char *uname, u32 n_uname, char *aname)
852 {
853 int err;
854 struct p9_req_t *req;
855 struct p9_fid *fid;
856 struct p9_qid qid;
857
858 P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
859 afid ? afid->fid : -1, uname, aname);
860 err = 0;
861
862 fid = p9_fid_create(clnt);
863 if (IS_ERR(fid)) {
864 err = PTR_ERR(fid);
865 fid = NULL;
866 goto error;
867 }
868
869 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
870 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
871 if (IS_ERR(req)) {
872 err = PTR_ERR(req);
873 goto error;
874 }
875
876 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
877 if (err) {
878 p9pdu_dump(1, req->rc);
879 p9_free_req(clnt, req);
880 goto error;
881 }
882
883 P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
884 qid.type,
885 (unsigned long long)qid.path,
886 qid.version);
887
888 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
889
890 p9_free_req(clnt, req);
891 return fid;
892
893 error:
894 if (fid)
895 p9_fid_destroy(fid);
896 return ERR_PTR(err);
897 }
898 EXPORT_SYMBOL(p9_client_attach);
899
900 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
901 int clone)
902 {
903 int err;
904 struct p9_client *clnt;
905 struct p9_fid *fid;
906 struct p9_qid *wqids;
907 struct p9_req_t *req;
908 int16_t nwqids, count;
909
910 err = 0;
911 wqids = NULL;
912 clnt = oldfid->clnt;
913 if (clone) {
914 fid = p9_fid_create(clnt);
915 if (IS_ERR(fid)) {
916 err = PTR_ERR(fid);
917 fid = NULL;
918 goto error;
919 }
920
921 fid->uid = oldfid->uid;
922 } else
923 fid = oldfid;
924
925
926 P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n",
927 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
928
929 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
930 nwname, wnames);
931 if (IS_ERR(req)) {
932 err = PTR_ERR(req);
933 goto error;
934 }
935
936 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
937 if (err) {
938 p9pdu_dump(1, req->rc);
939 p9_free_req(clnt, req);
940 goto clunk_fid;
941 }
942 p9_free_req(clnt, req);
943
944 P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
945
946 if (nwqids != nwname) {
947 err = -ENOENT;
948 goto clunk_fid;
949 }
950
951 for (count = 0; count < nwqids; count++)
952 P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
953 count, wqids[count].type,
954 (unsigned long long)wqids[count].path,
955 wqids[count].version);
956
957 if (nwname)
958 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
959 else
960 fid->qid = oldfid->qid;
961
962 kfree(wqids);
963 return fid;
964
965 clunk_fid:
966 kfree(wqids);
967 p9_client_clunk(fid);
968 fid = NULL;
969
970 error:
971 if (fid && (fid != oldfid))
972 p9_fid_destroy(fid);
973
974 return ERR_PTR(err);
975 }
976 EXPORT_SYMBOL(p9_client_walk);
977
978 int p9_client_open(struct p9_fid *fid, int mode)
979 {
980 int err;
981 struct p9_client *clnt;
982 struct p9_req_t *req;
983 struct p9_qid qid;
984 int iounit;
985
986 clnt = fid->clnt;
987 P9_DPRINTK(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
988 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
989 err = 0;
990
991 if (fid->mode != -1)
992 return -EINVAL;
993
994 if (p9_is_proto_dotl(clnt))
995 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
996 else
997 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
998 if (IS_ERR(req)) {
999 err = PTR_ERR(req);
1000 goto error;
1001 }
1002
1003 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1004 if (err) {
1005 p9pdu_dump(1, req->rc);
1006 goto free_and_error;
1007 }
1008
1009 P9_DPRINTK(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1010 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1011 (unsigned long long)qid.path, qid.version, iounit);
1012
1013 fid->mode = mode;
1014 fid->iounit = iounit;
1015
1016 free_and_error:
1017 p9_free_req(clnt, req);
1018 error:
1019 return err;
1020 }
1021 EXPORT_SYMBOL(p9_client_open);
1022
1023 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1024 gid_t gid, struct p9_qid *qid)
1025 {
1026 int err = 0;
1027 struct p9_client *clnt;
1028 struct p9_req_t *req;
1029 int iounit;
1030
1031 P9_DPRINTK(P9_DEBUG_9P,
1032 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1033 ofid->fid, name, flags, mode, gid);
1034 clnt = ofid->clnt;
1035
1036 if (ofid->mode != -1)
1037 return -EINVAL;
1038
1039 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags,
1040 mode, gid);
1041 if (IS_ERR(req)) {
1042 err = PTR_ERR(req);
1043 goto error;
1044 }
1045
1046 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1047 if (err) {
1048 p9pdu_dump(1, req->rc);
1049 goto free_and_error;
1050 }
1051
1052 P9_DPRINTK(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1053 qid->type,
1054 (unsigned long long)qid->path,
1055 qid->version, iounit);
1056
1057 ofid->mode = mode;
1058 ofid->iounit = iounit;
1059
1060 free_and_error:
1061 p9_free_req(clnt, req);
1062 error:
1063 return err;
1064 }
1065 EXPORT_SYMBOL(p9_client_create_dotl);
1066
1067 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1068 char *extension)
1069 {
1070 int err;
1071 struct p9_client *clnt;
1072 struct p9_req_t *req;
1073 struct p9_qid qid;
1074 int iounit;
1075
1076 P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1077 fid->fid, name, perm, mode);
1078 err = 0;
1079 clnt = fid->clnt;
1080
1081 if (fid->mode != -1)
1082 return -EINVAL;
1083
1084 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1085 mode, extension);
1086 if (IS_ERR(req)) {
1087 err = PTR_ERR(req);
1088 goto error;
1089 }
1090
1091 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1092 if (err) {
1093 p9pdu_dump(1, req->rc);
1094 goto free_and_error;
1095 }
1096
1097 P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1098 qid.type,
1099 (unsigned long long)qid.path,
1100 qid.version, iounit);
1101
1102 fid->mode = mode;
1103 fid->iounit = iounit;
1104
1105 free_and_error:
1106 p9_free_req(clnt, req);
1107 error:
1108 return err;
1109 }
1110 EXPORT_SYMBOL(p9_client_fcreate);
1111
1112 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid,
1113 struct p9_qid *qid)
1114 {
1115 int err = 0;
1116 struct p9_client *clnt;
1117 struct p9_req_t *req;
1118
1119 P9_DPRINTK(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1120 dfid->fid, name, symtgt);
1121 clnt = dfid->clnt;
1122
1123 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt,
1124 gid);
1125 if (IS_ERR(req)) {
1126 err = PTR_ERR(req);
1127 goto error;
1128 }
1129
1130 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1131 if (err) {
1132 p9pdu_dump(1, req->rc);
1133 goto free_and_error;
1134 }
1135
1136 P9_DPRINTK(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1137 qid->type, (unsigned long long)qid->path, qid->version);
1138
1139 free_and_error:
1140 p9_free_req(clnt, req);
1141 error:
1142 return err;
1143 }
1144 EXPORT_SYMBOL(p9_client_symlink);
1145
1146 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1147 {
1148 struct p9_client *clnt;
1149 struct p9_req_t *req;
1150
1151 P9_DPRINTK(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1152 dfid->fid, oldfid->fid, newname);
1153 clnt = dfid->clnt;
1154 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1155 newname);
1156 if (IS_ERR(req))
1157 return PTR_ERR(req);
1158
1159 P9_DPRINTK(P9_DEBUG_9P, "<<< RLINK\n");
1160 p9_free_req(clnt, req);
1161 return 0;
1162 }
1163 EXPORT_SYMBOL(p9_client_link);
1164
1165 int p9_client_clunk(struct p9_fid *fid)
1166 {
1167 int err;
1168 struct p9_client *clnt;
1169 struct p9_req_t *req;
1170
1171 if (!fid) {
1172 P9_EPRINTK(KERN_WARNING, "Trying to clunk with NULL fid\n");
1173 dump_stack();
1174 return 0;
1175 }
1176
1177 P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
1178 err = 0;
1179 clnt = fid->clnt;
1180
1181 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1182 if (IS_ERR(req)) {
1183 err = PTR_ERR(req);
1184 goto error;
1185 }
1186
1187 P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1188
1189 p9_free_req(clnt, req);
1190 p9_fid_destroy(fid);
1191
1192 error:
1193 return err;
1194 }
1195 EXPORT_SYMBOL(p9_client_clunk);
1196
1197 int p9_client_remove(struct p9_fid *fid)
1198 {
1199 int err;
1200 struct p9_client *clnt;
1201 struct p9_req_t *req;
1202
1203 P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1204 err = 0;
1205 clnt = fid->clnt;
1206
1207 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1208 if (IS_ERR(req)) {
1209 err = PTR_ERR(req);
1210 goto error;
1211 }
1212
1213 P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1214
1215 p9_free_req(clnt, req);
1216 error:
1217 p9_fid_destroy(fid);
1218 return err;
1219 }
1220 EXPORT_SYMBOL(p9_client_remove);
1221
1222 int
1223 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1224 u32 count)
1225 {
1226 int err, rsize, total;
1227 struct p9_client *clnt;
1228 struct p9_req_t *req;
1229 char *dataptr;
1230
1231 P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid,
1232 (long long unsigned) offset, count);
1233 err = 0;
1234 clnt = fid->clnt;
1235 total = 0;
1236
1237 rsize = fid->iounit;
1238 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1239 rsize = clnt->msize - P9_IOHDRSZ;
1240
1241 if (count < rsize)
1242 rsize = count;
1243
1244 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, rsize);
1245 if (IS_ERR(req)) {
1246 err = PTR_ERR(req);
1247 goto error;
1248 }
1249
1250 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1251 if (err) {
1252 p9pdu_dump(1, req->rc);
1253 goto free_and_error;
1254 }
1255
1256 P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1257
1258 if (data) {
1259 memmove(data, dataptr, count);
1260 }
1261
1262 if (udata) {
1263 err = copy_to_user(udata, dataptr, count);
1264 if (err) {
1265 err = -EFAULT;
1266 goto free_and_error;
1267 }
1268 }
1269
1270 p9_free_req(clnt, req);
1271 return count;
1272
1273 free_and_error:
1274 p9_free_req(clnt, req);
1275 error:
1276 return err;
1277 }
1278 EXPORT_SYMBOL(p9_client_read);
1279
1280 int
1281 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1282 u64 offset, u32 count)
1283 {
1284 int err, rsize, total;
1285 struct p9_client *clnt;
1286 struct p9_req_t *req;
1287
1288 P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1289 fid->fid, (long long unsigned) offset, count);
1290 err = 0;
1291 clnt = fid->clnt;
1292 total = 0;
1293
1294 rsize = fid->iounit;
1295 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1296 rsize = clnt->msize - P9_IOHDRSZ;
1297
1298 if (count < rsize)
1299 rsize = count;
1300 if (data)
1301 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, offset,
1302 rsize, data);
1303 else
1304 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, offset,
1305 rsize, udata);
1306 if (IS_ERR(req)) {
1307 err = PTR_ERR(req);
1308 goto error;
1309 }
1310
1311 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1312 if (err) {
1313 p9pdu_dump(1, req->rc);
1314 goto free_and_error;
1315 }
1316
1317 P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1318
1319 p9_free_req(clnt, req);
1320 return count;
1321
1322 free_and_error:
1323 p9_free_req(clnt, req);
1324 error:
1325 return err;
1326 }
1327 EXPORT_SYMBOL(p9_client_write);
1328
1329 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1330 {
1331 int err;
1332 struct p9_client *clnt;
1333 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1334 struct p9_req_t *req;
1335 u16 ignored;
1336
1337 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1338
1339 if (!ret)
1340 return ERR_PTR(-ENOMEM);
1341
1342 err = 0;
1343 clnt = fid->clnt;
1344
1345 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1346 if (IS_ERR(req)) {
1347 err = PTR_ERR(req);
1348 goto error;
1349 }
1350
1351 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1352 if (err) {
1353 p9pdu_dump(1, req->rc);
1354 p9_free_req(clnt, req);
1355 goto error;
1356 }
1357
1358 P9_DPRINTK(P9_DEBUG_9P,
1359 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1360 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1361 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1362 "<<< uid=%d gid=%d n_muid=%d\n",
1363 ret->size, ret->type, ret->dev, ret->qid.type,
1364 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1365 ret->atime, ret->mtime, (unsigned long long)ret->length,
1366 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1367 ret->n_uid, ret->n_gid, ret->n_muid);
1368
1369 p9_free_req(clnt, req);
1370 return ret;
1371
1372 error:
1373 kfree(ret);
1374 return ERR_PTR(err);
1375 }
1376 EXPORT_SYMBOL(p9_client_stat);
1377
1378 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1379 u64 request_mask)
1380 {
1381 int err;
1382 struct p9_client *clnt;
1383 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1384 GFP_KERNEL);
1385 struct p9_req_t *req;
1386
1387 P9_DPRINTK(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1388 fid->fid, request_mask);
1389
1390 if (!ret)
1391 return ERR_PTR(-ENOMEM);
1392
1393 err = 0;
1394 clnt = fid->clnt;
1395
1396 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1397 if (IS_ERR(req)) {
1398 err = PTR_ERR(req);
1399 goto error;
1400 }
1401
1402 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1403 if (err) {
1404 p9pdu_dump(1, req->rc);
1405 p9_free_req(clnt, req);
1406 goto error;
1407 }
1408
1409 P9_DPRINTK(P9_DEBUG_9P,
1410 "<<< RGETATTR st_result_mask=%lld\n"
1411 "<<< qid=%x.%llx.%x\n"
1412 "<<< st_mode=%8.8x st_nlink=%llu\n"
1413 "<<< st_uid=%d st_gid=%d\n"
1414 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1415 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1416 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1417 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1418 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1419 "<<< st_gen=%lld st_data_version=%lld",
1420 ret->st_result_mask, ret->qid.type, ret->qid.path,
1421 ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid,
1422 ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize,
1423 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1424 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1425 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1426 ret->st_gen, ret->st_data_version);
1427
1428 p9_free_req(clnt, req);
1429 return ret;
1430
1431 error:
1432 kfree(ret);
1433 return ERR_PTR(err);
1434 }
1435 EXPORT_SYMBOL(p9_client_getattr_dotl);
1436
1437 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1438 {
1439 int ret;
1440
1441 /* NOTE: size shouldn't include its own length */
1442 /* size[2] type[2] dev[4] qid[13] */
1443 /* mode[4] atime[4] mtime[4] length[8]*/
1444 /* name[s] uid[s] gid[s] muid[s] */
1445 ret = 2+4+13+4+4+4+8+2+2+2+2;
1446
1447 if (wst->name)
1448 ret += strlen(wst->name);
1449 if (wst->uid)
1450 ret += strlen(wst->uid);
1451 if (wst->gid)
1452 ret += strlen(wst->gid);
1453 if (wst->muid)
1454 ret += strlen(wst->muid);
1455
1456 if ((proto_version == p9_proto_2000u) ||
1457 (proto_version == p9_proto_2000L)) {
1458 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1459 if (wst->extension)
1460 ret += strlen(wst->extension);
1461 }
1462
1463 return ret;
1464 }
1465
1466 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1467 {
1468 int err;
1469 struct p9_req_t *req;
1470 struct p9_client *clnt;
1471
1472 err = 0;
1473 clnt = fid->clnt;
1474 wst->size = p9_client_statsize(wst, clnt->proto_version);
1475 P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1476 P9_DPRINTK(P9_DEBUG_9P,
1477 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1478 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1479 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1480 " uid=%d gid=%d n_muid=%d\n",
1481 wst->size, wst->type, wst->dev, wst->qid.type,
1482 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1483 wst->atime, wst->mtime, (unsigned long long)wst->length,
1484 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1485 wst->n_uid, wst->n_gid, wst->n_muid);
1486
1487 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1488 if (IS_ERR(req)) {
1489 err = PTR_ERR(req);
1490 goto error;
1491 }
1492
1493 P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1494
1495 p9_free_req(clnt, req);
1496 error:
1497 return err;
1498 }
1499 EXPORT_SYMBOL(p9_client_wstat);
1500
1501 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1502 {
1503 int err;
1504 struct p9_req_t *req;
1505 struct p9_client *clnt;
1506
1507 err = 0;
1508 clnt = fid->clnt;
1509 P9_DPRINTK(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1510 P9_DPRINTK(P9_DEBUG_9P,
1511 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1512 " atime_sec=%lld atime_nsec=%lld\n"
1513 " mtime_sec=%lld mtime_nsec=%lld\n",
1514 p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid,
1515 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1516 p9attr->mtime_sec, p9attr->mtime_nsec);
1517
1518 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1519
1520 if (IS_ERR(req)) {
1521 err = PTR_ERR(req);
1522 goto error;
1523 }
1524 P9_DPRINTK(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1525 p9_free_req(clnt, req);
1526 error:
1527 return err;
1528 }
1529 EXPORT_SYMBOL(p9_client_setattr);
1530
1531 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1532 {
1533 int err;
1534 struct p9_req_t *req;
1535 struct p9_client *clnt;
1536
1537 err = 0;
1538 clnt = fid->clnt;
1539
1540 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1541
1542 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1543 if (IS_ERR(req)) {
1544 err = PTR_ERR(req);
1545 goto error;
1546 }
1547
1548 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1549 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1550 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1551 if (err) {
1552 p9pdu_dump(1, req->rc);
1553 p9_free_req(clnt, req);
1554 goto error;
1555 }
1556
1557 P9_DPRINTK(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1558 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1559 "fsid %llu namelen %ld\n",
1560 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1561 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1562 sb->fsid, (long int)sb->namelen);
1563
1564 p9_free_req(clnt, req);
1565 error:
1566 return err;
1567 }
1568 EXPORT_SYMBOL(p9_client_statfs);
1569
1570 int p9_client_rename(struct p9_fid *fid, struct p9_fid *newdirfid, char *name)
1571 {
1572 int err;
1573 struct p9_req_t *req;
1574 struct p9_client *clnt;
1575
1576 err = 0;
1577 clnt = fid->clnt;
1578
1579 P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1580 fid->fid, newdirfid->fid, name);
1581
1582 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1583 newdirfid->fid, name);
1584 if (IS_ERR(req)) {
1585 err = PTR_ERR(req);
1586 goto error;
1587 }
1588
1589 P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1590
1591 p9_free_req(clnt, req);
1592 error:
1593 return err;
1594 }
1595 EXPORT_SYMBOL(p9_client_rename);
1596
1597 /*
1598 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1599 */
1600 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1601 const char *attr_name, u64 *attr_size)
1602 {
1603 int err;
1604 struct p9_req_t *req;
1605 struct p9_client *clnt;
1606 struct p9_fid *attr_fid;
1607
1608 err = 0;
1609 clnt = file_fid->clnt;
1610 attr_fid = p9_fid_create(clnt);
1611 if (IS_ERR(attr_fid)) {
1612 err = PTR_ERR(attr_fid);
1613 attr_fid = NULL;
1614 goto error;
1615 }
1616 P9_DPRINTK(P9_DEBUG_9P,
1617 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
1618 file_fid->fid, attr_fid->fid, attr_name);
1619
1620 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
1621 file_fid->fid, attr_fid->fid, attr_name);
1622 if (IS_ERR(req)) {
1623 err = PTR_ERR(req);
1624 goto error;
1625 }
1626 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
1627 if (err) {
1628 p9pdu_dump(1, req->rc);
1629 p9_free_req(clnt, req);
1630 goto clunk_fid;
1631 }
1632 p9_free_req(clnt, req);
1633 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
1634 attr_fid->fid, *attr_size);
1635 return attr_fid;
1636 clunk_fid:
1637 p9_client_clunk(attr_fid);
1638 attr_fid = NULL;
1639 error:
1640 if (attr_fid && (attr_fid != file_fid))
1641 p9_fid_destroy(attr_fid);
1642
1643 return ERR_PTR(err);
1644 }
1645 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
1646
1647 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
1648 u64 attr_size, int flags)
1649 {
1650 int err;
1651 struct p9_req_t *req;
1652 struct p9_client *clnt;
1653
1654 P9_DPRINTK(P9_DEBUG_9P,
1655 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
1656 fid->fid, name, (long long)attr_size, flags);
1657 err = 0;
1658 clnt = fid->clnt;
1659 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
1660 fid->fid, name, attr_size, flags);
1661 if (IS_ERR(req)) {
1662 err = PTR_ERR(req);
1663 goto error;
1664 }
1665 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
1666 p9_free_req(clnt, req);
1667 error:
1668 return err;
1669 }
1670 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
1671
1672 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
1673 {
1674 int err, rsize, total;
1675 struct p9_client *clnt;
1676 struct p9_req_t *req;
1677 char *dataptr;
1678
1679 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
1680 fid->fid, (long long unsigned) offset, count);
1681
1682 err = 0;
1683 clnt = fid->clnt;
1684 total = 0;
1685
1686 rsize = fid->iounit;
1687 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
1688 rsize = clnt->msize - P9_READDIRHDRSZ;
1689
1690 if (count < rsize)
1691 rsize = count;
1692
1693 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, offset, rsize);
1694 if (IS_ERR(req)) {
1695 err = PTR_ERR(req);
1696 goto error;
1697 }
1698
1699 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1700 if (err) {
1701 p9pdu_dump(1, req->rc);
1702 goto free_and_error;
1703 }
1704
1705 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
1706
1707 if (data)
1708 memmove(data, dataptr, count);
1709
1710 p9_free_req(clnt, req);
1711 return count;
1712
1713 free_and_error:
1714 p9_free_req(clnt, req);
1715 error:
1716 return err;
1717 }
1718 EXPORT_SYMBOL(p9_client_readdir);
1719
1720 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
1721 dev_t rdev, gid_t gid, struct p9_qid *qid)
1722 {
1723 int err;
1724 struct p9_client *clnt;
1725 struct p9_req_t *req;
1726
1727 err = 0;
1728 clnt = fid->clnt;
1729 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
1730 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
1731 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode,
1732 MAJOR(rdev), MINOR(rdev), gid);
1733 if (IS_ERR(req))
1734 return PTR_ERR(req);
1735
1736 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1737 if (err) {
1738 p9pdu_dump(1, req->rc);
1739 goto error;
1740 }
1741 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
1742 (unsigned long long)qid->path, qid->version);
1743
1744 error:
1745 p9_free_req(clnt, req);
1746 return err;
1747
1748 }
1749 EXPORT_SYMBOL(p9_client_mknod_dotl);
1750
1751 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
1752 gid_t gid, struct p9_qid *qid)
1753 {
1754 int err;
1755 struct p9_client *clnt;
1756 struct p9_req_t *req;
1757
1758 err = 0;
1759 clnt = fid->clnt;
1760 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
1761 fid->fid, name, mode, gid);
1762 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode,
1763 gid);
1764 if (IS_ERR(req))
1765 return PTR_ERR(req);
1766
1767 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1768 if (err) {
1769 p9pdu_dump(1, req->rc);
1770 goto error;
1771 }
1772 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
1773 (unsigned long long)qid->path, qid->version);
1774
1775 error:
1776 p9_free_req(clnt, req);
1777 return err;
1778
1779 }
1780 EXPORT_SYMBOL(p9_client_mkdir_dotl);
Linux kernel - Deliverables
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