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writeback: split writeback_inodes_wb
[linux-2.6/next.git] / net / 9p / client.c
blob37c8da07a80b080c6d93f9a2bdd1226873354af8
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_destroy(c->tagpool);
336
337 /* free requests associated with tags */
338 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
339 for (col = 0; col < P9_ROW_MAXTAG; col++) {
340 kfree(c->reqs[row][col].wq);
341 kfree(c->reqs[row][col].tc);
342 kfree(c->reqs[row][col].rc);
343 }
344 kfree(c->reqs[row]);
345 }
346 c->max_tag = 0;
347 }
348
349 /**
350 * p9_free_req - free a request and clean-up as necessary
351 * c: client state
352 * r: request to release
353 *
354 */
355
356 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
357 {
358 int tag = r->tc->tag;
359 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
360
361 r->status = REQ_STATUS_IDLE;
362 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
363 p9_idpool_put(tag, c->tagpool);
364 }
365
366 /**
367 * p9_client_cb - call back from transport to client
368 * c: client state
369 * req: request received
370 *
371 */
372 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
373 {
374 P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
375 wake_up(req->wq);
376 P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
377 }
378 EXPORT_SYMBOL(p9_client_cb);
379
380 /**
381 * p9_parse_header - parse header arguments out of a packet
382 * @pdu: packet to parse
383 * @size: size of packet
384 * @type: type of request
385 * @tag: tag of packet
386 * @rewind: set if we need to rewind offset afterwards
387 */
388
389 int
390 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
391 int rewind)
392 {
393 int8_t r_type;
394 int16_t r_tag;
395 int32_t r_size;
396 int offset = pdu->offset;
397 int err;
398
399 pdu->offset = 0;
400 if (pdu->size == 0)
401 pdu->size = 7;
402
403 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
404 if (err)
405 goto rewind_and_exit;
406
407 pdu->size = r_size;
408 pdu->id = r_type;
409 pdu->tag = r_tag;
410
411 P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size,
412 pdu->id, pdu->tag);
413
414 if (type)
415 *type = r_type;
416 if (tag)
417 *tag = r_tag;
418 if (size)
419 *size = r_size;
420
421
422 rewind_and_exit:
423 if (rewind)
424 pdu->offset = offset;
425 return err;
426 }
427 EXPORT_SYMBOL(p9_parse_header);
428
429 /**
430 * p9_check_errors - check 9p packet for error return and process it
431 * @c: current client instance
432 * @req: request to parse and check for error conditions
433 *
434 * returns error code if one is discovered, otherwise returns 0
435 *
436 * this will have to be more complicated if we have multiple
437 * error packet types
438 */
439
440 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
441 {
442 int8_t type;
443 int err;
444
445 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
446 if (err) {
447 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
448 return err;
449 }
450
451 if (type == P9_RERROR) {
452 int ecode;
453 char *ename;
454
455 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
456 &ename, &ecode);
457 if (err) {
458 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n",
459 err);
460 return err;
461 }
462
463 if (p9_is_proto_dotu(c))
464 err = -ecode;
465
466 if (!err || !IS_ERR_VALUE(err))
467 err = p9_errstr2errno(ename, strlen(ename));
468
469 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode, ename);
470
471 kfree(ename);
472 } else
473 err = 0;
474
475 return err;
476 }
477
478 /**
479 * p9_client_flush - flush (cancel) a request
480 * @c: client state
481 * @oldreq: request to cancel
482 *
483 * This sents a flush for a particular requests and links
484 * the flush request to the original request. The current
485 * code only supports a single flush request although the protocol
486 * allows for multiple flush requests to be sent for a single request.
487 *
488 */
489
490 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
491 {
492 struct p9_req_t *req;
493 int16_t oldtag;
494 int err;
495
496 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
497 if (err)
498 return err;
499
500 P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
501
502 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
503 if (IS_ERR(req))
504 return PTR_ERR(req);
505
506
507 /* if we haven't received a response for oldreq,
508 remove it from the list. */
509 spin_lock(&c->lock);
510 if (oldreq->status == REQ_STATUS_FLSH)
511 list_del(&oldreq->req_list);
512 spin_unlock(&c->lock);
513
514 p9_free_req(c, req);
515 return 0;
516 }
517
518 /**
519 * p9_client_rpc - issue a request and wait for a response
520 * @c: client session
521 * @type: type of request
522 * @fmt: protocol format string (see protocol.c)
523 *
524 * Returns request structure (which client must free using p9_free_req)
525 */
526
527 static struct p9_req_t *
528 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
529 {
530 va_list ap;
531 int tag, err;
532 struct p9_req_t *req;
533 unsigned long flags;
534 int sigpending;
535
536 P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
537
538 /* we allow for any status other than disconnected */
539 if (c->status == Disconnected)
540 return ERR_PTR(-EIO);
541
542 /* if status is begin_disconnected we allow only clunk request */
543 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
544 return ERR_PTR(-EIO);
545
546 if (signal_pending(current)) {
547 sigpending = 1;
548 clear_thread_flag(TIF_SIGPENDING);
549 } else
550 sigpending = 0;
551
552 tag = P9_NOTAG;
553 if (type != P9_TVERSION) {
554 tag = p9_idpool_get(c->tagpool);
555 if (tag < 0)
556 return ERR_PTR(-ENOMEM);
557 }
558
559 req = p9_tag_alloc(c, tag);
560 if (IS_ERR(req))
561 return req;
562
563 /* marshall the data */
564 p9pdu_prepare(req->tc, tag, type);
565 va_start(ap, fmt);
566 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
567 va_end(ap);
568 p9pdu_finalize(req->tc);
569
570 err = c->trans_mod->request(c, req);
571 if (err < 0) {
572 c->status = Disconnected;
573 goto reterr;
574 }
575
576 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag);
577 err = wait_event_interruptible(*req->wq,
578 req->status >= REQ_STATUS_RCVD);
579 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n",
580 req->wq, tag, err);
581
582 if (req->status == REQ_STATUS_ERROR) {
583 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
584 err = req->t_err;
585 }
586
587 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
588 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
589 sigpending = 1;
590 clear_thread_flag(TIF_SIGPENDING);
591
592 if (c->trans_mod->cancel(c, req))
593 p9_client_flush(c, req);
594
595 /* if we received the response anyway, don't signal error */
596 if (req->status == REQ_STATUS_RCVD)
597 err = 0;
598 }
599
600 if (sigpending) {
601 spin_lock_irqsave(&current->sighand->siglock, flags);
602 recalc_sigpending();
603 spin_unlock_irqrestore(&current->sighand->siglock, flags);
604 }
605
606 if (err < 0)
607 goto reterr;
608
609 err = p9_check_errors(c, req);
610 if (!err) {
611 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
612 return req;
613 }
614
615 reterr:
616 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
617 err);
618 p9_free_req(c, req);
619 return ERR_PTR(err);
620 }
621
622 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
623 {
624 int ret;
625 struct p9_fid *fid;
626 unsigned long flags;
627
628 P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
629 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
630 if (!fid)
631 return ERR_PTR(-ENOMEM);
632
633 ret = p9_idpool_get(clnt->fidpool);
634 if (ret < 0) {
635 ret = -ENOSPC;
636 goto error;
637 }
638 fid->fid = ret;
639
640 memset(&fid->qid, 0, sizeof(struct p9_qid));
641 fid->mode = -1;
642 fid->uid = current_fsuid();
643 fid->clnt = clnt;
644 fid->rdir = NULL;
645 spin_lock_irqsave(&clnt->lock, flags);
646 list_add(&fid->flist, &clnt->fidlist);
647 spin_unlock_irqrestore(&clnt->lock, flags);
648
649 return fid;
650
651 error:
652 kfree(fid);
653 return ERR_PTR(ret);
654 }
655
656 static void p9_fid_destroy(struct p9_fid *fid)
657 {
658 struct p9_client *clnt;
659 unsigned long flags;
660
661 P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
662 clnt = fid->clnt;
663 p9_idpool_put(fid->fid, clnt->fidpool);
664 spin_lock_irqsave(&clnt->lock, flags);
665 list_del(&fid->flist);
666 spin_unlock_irqrestore(&clnt->lock, flags);
667 kfree(fid->rdir);
668 kfree(fid);
669 }
670
671 int p9_client_version(struct p9_client *c)
672 {
673 int err = 0;
674 struct p9_req_t *req;
675 char *version;
676 int msize;
677
678 P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
679 c->msize, c->proto_version);
680
681 switch (c->proto_version) {
682 case p9_proto_2000L:
683 req = p9_client_rpc(c, P9_TVERSION, "ds",
684 c->msize, "9P2000.L");
685 break;
686 case p9_proto_2000u:
687 req = p9_client_rpc(c, P9_TVERSION, "ds",
688 c->msize, "9P2000.u");
689 break;
690 case p9_proto_legacy:
691 req = p9_client_rpc(c, P9_TVERSION, "ds",
692 c->msize, "9P2000");
693 break;
694 default:
695 return -EINVAL;
696 break;
697 }
698
699 if (IS_ERR(req))
700 return PTR_ERR(req);
701
702 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
703 if (err) {
704 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
705 p9pdu_dump(1, req->rc);
706 goto error;
707 }
708
709 P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
710 if (!strncmp(version, "9P2000.L", 8))
711 c->proto_version = p9_proto_2000L;
712 else if (!strncmp(version, "9P2000.u", 8))
713 c->proto_version = p9_proto_2000u;
714 else if (!strncmp(version, "9P2000", 6))
715 c->proto_version = p9_proto_legacy;
716 else {
717 err = -EREMOTEIO;
718 goto error;
719 }
720
721 if (msize < c->msize)
722 c->msize = msize;
723
724 error:
725 kfree(version);
726 p9_free_req(c, req);
727
728 return err;
729 }
730 EXPORT_SYMBOL(p9_client_version);
731
732 struct p9_client *p9_client_create(const char *dev_name, char *options)
733 {
734 int err;
735 struct p9_client *clnt;
736
737 err = 0;
738 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
739 if (!clnt)
740 return ERR_PTR(-ENOMEM);
741
742 clnt->trans_mod = NULL;
743 clnt->trans = NULL;
744 spin_lock_init(&clnt->lock);
745 INIT_LIST_HEAD(&clnt->fidlist);
746
747 p9_tag_init(clnt);
748
749 err = parse_opts(options, clnt);
750 if (err < 0)
751 goto free_client;
752
753 if (!clnt->trans_mod)
754 clnt->trans_mod = v9fs_get_default_trans();
755
756 if (clnt->trans_mod == NULL) {
757 err = -EPROTONOSUPPORT;
758 P9_DPRINTK(P9_DEBUG_ERROR,
759 "No transport defined or default transport\n");
760 goto free_client;
761 }
762
763 clnt->fidpool = p9_idpool_create();
764 if (IS_ERR(clnt->fidpool)) {
765 err = PTR_ERR(clnt->fidpool);
766 clnt->fidpool = NULL;
767 goto put_trans;
768 }
769
770 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
771 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
772
773 err = clnt->trans_mod->create(clnt, dev_name, options);
774 if (err)
775 goto destroy_fidpool;
776
777 if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize)
778 clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ;
779
780 err = p9_client_version(clnt);
781 if (err)
782 goto close_trans;
783
784 return clnt;
785
786 close_trans:
787 clnt->trans_mod->close(clnt);
788 destroy_fidpool:
789 p9_idpool_destroy(clnt->fidpool);
790 put_trans:
791 v9fs_put_trans(clnt->trans_mod);
792 free_client:
793 kfree(clnt);
794 return ERR_PTR(err);
795 }
796 EXPORT_SYMBOL(p9_client_create);
797
798 void p9_client_destroy(struct p9_client *clnt)
799 {
800 struct p9_fid *fid, *fidptr;
801
802 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt);
803
804 if (clnt->trans_mod)
805 clnt->trans_mod->close(clnt);
806
807 v9fs_put_trans(clnt->trans_mod);
808
809 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
810 printk(KERN_INFO "Found fid %d not clunked\n", fid->fid);
811 p9_fid_destroy(fid);
812 }
813
814 if (clnt->fidpool)
815 p9_idpool_destroy(clnt->fidpool);
816
817 p9_tag_cleanup(clnt);
818
819 kfree(clnt);
820 }
821 EXPORT_SYMBOL(p9_client_destroy);
822
823 void p9_client_disconnect(struct p9_client *clnt)
824 {
825 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
826 clnt->status = Disconnected;
827 }
828 EXPORT_SYMBOL(p9_client_disconnect);
829
830 void p9_client_begin_disconnect(struct p9_client *clnt)
831 {
832 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
833 clnt->status = BeginDisconnect;
834 }
835 EXPORT_SYMBOL(p9_client_begin_disconnect);
836
837 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
838 char *uname, u32 n_uname, char *aname)
839 {
840 int err;
841 struct p9_req_t *req;
842 struct p9_fid *fid;
843 struct p9_qid qid;
844
845 P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
846 afid ? afid->fid : -1, uname, aname);
847 err = 0;
848
849 fid = p9_fid_create(clnt);
850 if (IS_ERR(fid)) {
851 err = PTR_ERR(fid);
852 fid = NULL;
853 goto error;
854 }
855
856 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
857 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
858 if (IS_ERR(req)) {
859 err = PTR_ERR(req);
860 goto error;
861 }
862
863 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
864 if (err) {
865 p9pdu_dump(1, req->rc);
866 p9_free_req(clnt, req);
867 goto error;
868 }
869
870 P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
871 qid.type,
872 (unsigned long long)qid.path,
873 qid.version);
874
875 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
876
877 p9_free_req(clnt, req);
878 return fid;
879
880 error:
881 if (fid)
882 p9_fid_destroy(fid);
883 return ERR_PTR(err);
884 }
885 EXPORT_SYMBOL(p9_client_attach);
886
887 struct p9_fid *
888 p9_client_auth(struct p9_client *clnt, char *uname, u32 n_uname, char *aname)
889 {
890 int err;
891 struct p9_req_t *req;
892 struct p9_qid qid;
893 struct p9_fid *afid;
894
895 P9_DPRINTK(P9_DEBUG_9P, ">>> TAUTH uname %s aname %s\n", uname, aname);
896 err = 0;
897
898 afid = p9_fid_create(clnt);
899 if (IS_ERR(afid)) {
900 err = PTR_ERR(afid);
901 afid = NULL;
902 goto error;
903 }
904
905 req = p9_client_rpc(clnt, P9_TAUTH, "dss?d",
906 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
907 if (IS_ERR(req)) {
908 err = PTR_ERR(req);
909 goto error;
910 }
911
912 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
913 if (err) {
914 p9pdu_dump(1, req->rc);
915 p9_free_req(clnt, req);
916 goto error;
917 }
918
919 P9_DPRINTK(P9_DEBUG_9P, "<<< RAUTH qid %x.%llx.%x\n",
920 qid.type,
921 (unsigned long long)qid.path,
922 qid.version);
923
924 memmove(&afid->qid, &qid, sizeof(struct p9_qid));
925 p9_free_req(clnt, req);
926 return afid;
927
928 error:
929 if (afid)
930 p9_fid_destroy(afid);
931 return ERR_PTR(err);
932 }
933 EXPORT_SYMBOL(p9_client_auth);
934
935 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
936 int clone)
937 {
938 int err;
939 struct p9_client *clnt;
940 struct p9_fid *fid;
941 struct p9_qid *wqids;
942 struct p9_req_t *req;
943 int16_t nwqids, count;
944
945 err = 0;
946 clnt = oldfid->clnt;
947 if (clone) {
948 fid = p9_fid_create(clnt);
949 if (IS_ERR(fid)) {
950 err = PTR_ERR(fid);
951 fid = NULL;
952 goto error;
953 }
954
955 fid->uid = oldfid->uid;
956 } else
957 fid = oldfid;
958
959
960 P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n",
961 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
962
963 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
964 nwname, wnames);
965 if (IS_ERR(req)) {
966 err = PTR_ERR(req);
967 goto error;
968 }
969
970 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
971 if (err) {
972 p9pdu_dump(1, req->rc);
973 p9_free_req(clnt, req);
974 goto clunk_fid;
975 }
976 p9_free_req(clnt, req);
977
978 P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
979
980 if (nwqids != nwname) {
981 err = -ENOENT;
982 goto clunk_fid;
983 }
984
985 for (count = 0; count < nwqids; count++)
986 P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
987 count, wqids[count].type,
988 (unsigned long long)wqids[count].path,
989 wqids[count].version);
990
991 if (nwname)
992 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
993 else
994 fid->qid = oldfid->qid;
995
996 return fid;
997
998 clunk_fid:
999 p9_client_clunk(fid);
1000 fid = NULL;
1001
1002 error:
1003 if (fid && (fid != oldfid))
1004 p9_fid_destroy(fid);
1005
1006 return ERR_PTR(err);
1007 }
1008 EXPORT_SYMBOL(p9_client_walk);
1009
1010 int p9_client_open(struct p9_fid *fid, int mode)
1011 {
1012 int err;
1013 struct p9_client *clnt;
1014 struct p9_req_t *req;
1015 struct p9_qid qid;
1016 int iounit;
1017
1018 P9_DPRINTK(P9_DEBUG_9P, ">>> TOPEN fid %d mode %d\n", fid->fid, mode);
1019 err = 0;
1020 clnt = fid->clnt;
1021
1022 if (fid->mode != -1)
1023 return -EINVAL;
1024
1025 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1026 if (IS_ERR(req)) {
1027 err = PTR_ERR(req);
1028 goto error;
1029 }
1030
1031 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1032 if (err) {
1033 p9pdu_dump(1, req->rc);
1034 goto free_and_error;
1035 }
1036
1037 P9_DPRINTK(P9_DEBUG_9P, "<<< ROPEN qid %x.%llx.%x iounit %x\n",
1038 qid.type,
1039 (unsigned long long)qid.path,
1040 qid.version, iounit);
1041
1042 fid->mode = mode;
1043 fid->iounit = iounit;
1044
1045 free_and_error:
1046 p9_free_req(clnt, req);
1047 error:
1048 return err;
1049 }
1050 EXPORT_SYMBOL(p9_client_open);
1051
1052 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1053 char *extension)
1054 {
1055 int err;
1056 struct p9_client *clnt;
1057 struct p9_req_t *req;
1058 struct p9_qid qid;
1059 int iounit;
1060
1061 P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1062 fid->fid, name, perm, mode);
1063 err = 0;
1064 clnt = fid->clnt;
1065
1066 if (fid->mode != -1)
1067 return -EINVAL;
1068
1069 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1070 mode, extension);
1071 if (IS_ERR(req)) {
1072 err = PTR_ERR(req);
1073 goto error;
1074 }
1075
1076 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1077 if (err) {
1078 p9pdu_dump(1, req->rc);
1079 goto free_and_error;
1080 }
1081
1082 P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1083 qid.type,
1084 (unsigned long long)qid.path,
1085 qid.version, iounit);
1086
1087 fid->mode = mode;
1088 fid->iounit = iounit;
1089
1090 free_and_error:
1091 p9_free_req(clnt, req);
1092 error:
1093 return err;
1094 }
1095 EXPORT_SYMBOL(p9_client_fcreate);
1096
1097 int p9_client_clunk(struct p9_fid *fid)
1098 {
1099 int err;
1100 struct p9_client *clnt;
1101 struct p9_req_t *req;
1102
1103 P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
1104 err = 0;
1105 clnt = fid->clnt;
1106
1107 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1108 if (IS_ERR(req)) {
1109 err = PTR_ERR(req);
1110 goto error;
1111 }
1112
1113 P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1114
1115 p9_free_req(clnt, req);
1116 p9_fid_destroy(fid);
1117
1118 error:
1119 return err;
1120 }
1121 EXPORT_SYMBOL(p9_client_clunk);
1122
1123 int p9_client_remove(struct p9_fid *fid)
1124 {
1125 int err;
1126 struct p9_client *clnt;
1127 struct p9_req_t *req;
1128
1129 P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1130 err = 0;
1131 clnt = fid->clnt;
1132
1133 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1134 if (IS_ERR(req)) {
1135 err = PTR_ERR(req);
1136 goto error;
1137 }
1138
1139 P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1140
1141 p9_free_req(clnt, req);
1142 p9_fid_destroy(fid);
1143
1144 error:
1145 return err;
1146 }
1147 EXPORT_SYMBOL(p9_client_remove);
1148
1149 int
1150 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1151 u32 count)
1152 {
1153 int err, rsize, total;
1154 struct p9_client *clnt;
1155 struct p9_req_t *req;
1156 char *dataptr;
1157
1158 P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid,
1159 (long long unsigned) offset, count);
1160 err = 0;
1161 clnt = fid->clnt;
1162 total = 0;
1163
1164 rsize = fid->iounit;
1165 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1166 rsize = clnt->msize - P9_IOHDRSZ;
1167
1168 if (count < rsize)
1169 rsize = count;
1170
1171 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, rsize);
1172 if (IS_ERR(req)) {
1173 err = PTR_ERR(req);
1174 goto error;
1175 }
1176
1177 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1178 if (err) {
1179 p9pdu_dump(1, req->rc);
1180 goto free_and_error;
1181 }
1182
1183 P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1184
1185 if (data) {
1186 memmove(data, dataptr, count);
1187 }
1188
1189 if (udata) {
1190 err = copy_to_user(udata, dataptr, count);
1191 if (err) {
1192 err = -EFAULT;
1193 goto free_and_error;
1194 }
1195 }
1196
1197 p9_free_req(clnt, req);
1198 return count;
1199
1200 free_and_error:
1201 p9_free_req(clnt, req);
1202 error:
1203 return err;
1204 }
1205 EXPORT_SYMBOL(p9_client_read);
1206
1207 int
1208 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1209 u64 offset, u32 count)
1210 {
1211 int err, rsize, total;
1212 struct p9_client *clnt;
1213 struct p9_req_t *req;
1214
1215 P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1216 fid->fid, (long long unsigned) offset, count);
1217 err = 0;
1218 clnt = fid->clnt;
1219 total = 0;
1220
1221 rsize = fid->iounit;
1222 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1223 rsize = clnt->msize - P9_IOHDRSZ;
1224
1225 if (count < rsize)
1226 rsize = count;
1227 if (data)
1228 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, offset,
1229 rsize, data);
1230 else
1231 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, offset,
1232 rsize, udata);
1233 if (IS_ERR(req)) {
1234 err = PTR_ERR(req);
1235 goto error;
1236 }
1237
1238 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1239 if (err) {
1240 p9pdu_dump(1, req->rc);
1241 goto free_and_error;
1242 }
1243
1244 P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1245
1246 p9_free_req(clnt, req);
1247 return count;
1248
1249 free_and_error:
1250 p9_free_req(clnt, req);
1251 error:
1252 return err;
1253 }
1254 EXPORT_SYMBOL(p9_client_write);
1255
1256 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1257 {
1258 int err;
1259 struct p9_client *clnt;
1260 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1261 struct p9_req_t *req;
1262 u16 ignored;
1263
1264 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1265
1266 if (!ret)
1267 return ERR_PTR(-ENOMEM);
1268
1269 err = 0;
1270 clnt = fid->clnt;
1271
1272 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1273 if (IS_ERR(req)) {
1274 err = PTR_ERR(req);
1275 goto error;
1276 }
1277
1278 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1279 if (err) {
1280 p9pdu_dump(1, req->rc);
1281 p9_free_req(clnt, req);
1282 goto error;
1283 }
1284
1285 P9_DPRINTK(P9_DEBUG_9P,
1286 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1287 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1288 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1289 "<<< uid=%d gid=%d n_muid=%d\n",
1290 ret->size, ret->type, ret->dev, ret->qid.type,
1291 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1292 ret->atime, ret->mtime, (unsigned long long)ret->length,
1293 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1294 ret->n_uid, ret->n_gid, ret->n_muid);
1295
1296 p9_free_req(clnt, req);
1297 return ret;
1298
1299 error:
1300 kfree(ret);
1301 return ERR_PTR(err);
1302 }
1303 EXPORT_SYMBOL(p9_client_stat);
1304
1305 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1306 {
1307 int ret;
1308
1309 /* NOTE: size shouldn't include its own length */
1310 /* size[2] type[2] dev[4] qid[13] */
1311 /* mode[4] atime[4] mtime[4] length[8]*/
1312 /* name[s] uid[s] gid[s] muid[s] */
1313 ret = 2+4+13+4+4+4+8+2+2+2+2;
1314
1315 if (wst->name)
1316 ret += strlen(wst->name);
1317 if (wst->uid)
1318 ret += strlen(wst->uid);
1319 if (wst->gid)
1320 ret += strlen(wst->gid);
1321 if (wst->muid)
1322 ret += strlen(wst->muid);
1323
1324 if ((proto_version == p9_proto_2000u) ||
1325 (proto_version == p9_proto_2000L)) {
1326 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1327 if (wst->extension)
1328 ret += strlen(wst->extension);
1329 }
1330
1331 return ret;
1332 }
1333
1334 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1335 {
1336 int err;
1337 struct p9_req_t *req;
1338 struct p9_client *clnt;
1339
1340 err = 0;
1341 clnt = fid->clnt;
1342 wst->size = p9_client_statsize(wst, clnt->proto_version);
1343 P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1344 P9_DPRINTK(P9_DEBUG_9P,
1345 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1346 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1347 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1348 " uid=%d gid=%d n_muid=%d\n",
1349 wst->size, wst->type, wst->dev, wst->qid.type,
1350 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1351 wst->atime, wst->mtime, (unsigned long long)wst->length,
1352 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1353 wst->n_uid, wst->n_gid, wst->n_muid);
1354
1355 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1356 if (IS_ERR(req)) {
1357 err = PTR_ERR(req);
1358 goto error;
1359 }
1360
1361 P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1362
1363 p9_free_req(clnt, req);
1364 error:
1365 return err;
1366 }
1367 EXPORT_SYMBOL(p9_client_wstat);
1368
1369 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1370 {
1371 int err;
1372 struct p9_req_t *req;
1373 struct p9_client *clnt;
1374
1375 err = 0;
1376 clnt = fid->clnt;
1377
1378 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1379
1380 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1381 if (IS_ERR(req)) {
1382 err = PTR_ERR(req);
1383 goto error;
1384 }
1385
1386 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1387 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1388 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1389 if (err) {
1390 p9pdu_dump(1, req->rc);
1391 p9_free_req(clnt, req);
1392 goto error;
1393 }
1394
1395 P9_DPRINTK(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1396 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1397 "fsid %llu namelen %ld\n",
1398 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1399 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1400 sb->fsid, (long int)sb->namelen);
1401
1402 p9_free_req(clnt, req);
1403 error:
1404 return err;
1405 }
1406 EXPORT_SYMBOL(p9_client_statfs);
1407
1408 int p9_client_rename(struct p9_fid *fid, struct p9_fid *newdirfid, char *name)
1409 {
1410 int err;
1411 struct p9_req_t *req;
1412 struct p9_client *clnt;
1413
1414 err = 0;
1415 clnt = fid->clnt;
1416
1417 P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1418 fid->fid, newdirfid->fid, name);
1419
1420 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1421 newdirfid->fid, name);
1422 if (IS_ERR(req)) {
1423 err = PTR_ERR(req);
1424 goto error;
1425 }
1426
1427 P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1428
1429 p9_free_req(clnt, req);
1430 error:
1431 return err;
1432 }
1433 EXPORT_SYMBOL(p9_client_rename);
1434
linux-next