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Merge branch 'x86-platform-next' into x86-platform
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / 9p / client.c
1 /*
2 * net/9p/clnt.c
3 *
4 * 9P Client
5 *
6 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to:
20 * Free Software Foundation
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02111-1301 USA
23 *
24 */
25
26 #include <linux/module.h>
27 #include <linux/errno.h>
28 #include <linux/fs.h>
29 #include <linux/poll.h>
30 #include <linux/idr.h>
31 #include <linux/mutex.h>
32 #include <linux/slab.h>
33 #include <linux/sched.h>
34 #include <linux/uaccess.h>
35 #include <net/9p/9p.h>
36 #include <linux/parser.h>
37 #include <net/9p/client.h>
38 #include <net/9p/transport.h>
39 #include "protocol.h"
40
41 /*
42 * Client Option Parsing (code inspired by NFS code)
43 * - a little lazy - parse all client options
44 */
45
46 enum {
47 Opt_msize,
48 Opt_trans,
49 Opt_legacy,
50 Opt_version,
51 Opt_err,
52 };
53
54 static const match_table_t tokens = {
55 {Opt_msize, "msize=%u"},
56 {Opt_legacy, "noextend"},
57 {Opt_trans, "trans=%s"},
58 {Opt_version, "version=%s"},
59 {Opt_err, NULL},
60 };
61
62 inline int p9_is_proto_dotl(struct p9_client *clnt)
63 {
64 return clnt->proto_version == p9_proto_2000L;
65 }
66 EXPORT_SYMBOL(p9_is_proto_dotl);
67
68 inline int p9_is_proto_dotu(struct p9_client *clnt)
69 {
70 return clnt->proto_version == p9_proto_2000u;
71 }
72 EXPORT_SYMBOL(p9_is_proto_dotu);
73
74 /* Interpret mount option for protocol version */
75 static 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_NOFS);
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 if ((c->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
233 P9_TRANS_PREF_PAYLOAD_SEP) {
234 int alloc_msize = min(c->msize, 4096);
235 req->tc = kmalloc(sizeof(struct p9_fcall)+alloc_msize,
236 GFP_NOFS);
237 req->tc->capacity = alloc_msize;
238 req->rc = kmalloc(sizeof(struct p9_fcall)+alloc_msize,
239 GFP_NOFS);
240 req->rc->capacity = alloc_msize;
241 } else {
242 req->tc = kmalloc(sizeof(struct p9_fcall)+c->msize,
243 GFP_NOFS);
244 req->tc->capacity = c->msize;
245 req->rc = kmalloc(sizeof(struct p9_fcall)+c->msize,
246 GFP_NOFS);
247 req->rc->capacity = c->msize;
248 }
249 if ((!req->tc) || (!req->rc)) {
250 printk(KERN_ERR "Couldn't grow tag array\n");
251 kfree(req->tc);
252 kfree(req->rc);
253 kfree(req->wq);
254 req->tc = req->rc = NULL;
255 req->wq = NULL;
256 return ERR_PTR(-ENOMEM);
257 }
258 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
259 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
260 }
261
262 p9pdu_reset(req->tc);
263 p9pdu_reset(req->rc);
264
265 req->tc->tag = tag-1;
266 req->status = REQ_STATUS_ALLOC;
267
268 return &c->reqs[row][col];
269 }
270
271 /**
272 * p9_tag_lookup - lookup a request by tag
273 * @c: client session to lookup tag within
274 * @tag: numeric id for transaction
275 *
276 */
277
278 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
279 {
280 int row, col;
281
282 /* This looks up the original request by tag so we know which
283 * buffer to read the data into */
284 tag++;
285
286 BUG_ON(tag >= c->max_tag);
287
288 row = tag / P9_ROW_MAXTAG;
289 col = tag % P9_ROW_MAXTAG;
290
291 return &c->reqs[row][col];
292 }
293 EXPORT_SYMBOL(p9_tag_lookup);
294
295 /**
296 * p9_tag_init - setup tags structure and contents
297 * @c: v9fs client struct
298 *
299 * This initializes the tags structure for each client instance.
300 *
301 */
302
303 static int p9_tag_init(struct p9_client *c)
304 {
305 int err = 0;
306
307 c->tagpool = p9_idpool_create();
308 if (IS_ERR(c->tagpool)) {
309 err = PTR_ERR(c->tagpool);
310 c->tagpool = NULL;
311 goto error;
312 }
313
314 p9_idpool_get(c->tagpool); /* reserve tag 0 */
315
316 c->max_tag = 0;
317 error:
318 return err;
319 }
320
321 /**
322 * p9_tag_cleanup - cleans up tags structure and reclaims resources
323 * @c: v9fs client struct
324 *
325 * This frees resources associated with the tags structure
326 *
327 */
328 static void p9_tag_cleanup(struct p9_client *c)
329 {
330 int row, col;
331
332 /* check to insure all requests are idle */
333 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
334 for (col = 0; col < P9_ROW_MAXTAG; col++) {
335 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
336 P9_DPRINTK(P9_DEBUG_MUX,
337 "Attempting to cleanup non-free tag %d,%d\n",
338 row, col);
339 /* TODO: delay execution of cleanup */
340 return;
341 }
342 }
343 }
344
345 if (c->tagpool) {
346 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
347 p9_idpool_destroy(c->tagpool);
348 }
349
350 /* free requests associated with tags */
351 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
352 for (col = 0; col < P9_ROW_MAXTAG; col++) {
353 kfree(c->reqs[row][col].wq);
354 kfree(c->reqs[row][col].tc);
355 kfree(c->reqs[row][col].rc);
356 }
357 kfree(c->reqs[row]);
358 }
359 c->max_tag = 0;
360 }
361
362 /**
363 * p9_free_req - free a request and clean-up as necessary
364 * c: client state
365 * r: request to release
366 *
367 */
368
369 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
370 {
371 int tag = r->tc->tag;
372 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
373
374 r->status = REQ_STATUS_IDLE;
375 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
376 p9_idpool_put(tag, c->tagpool);
377 }
378
379 /**
380 * p9_client_cb - call back from transport to client
381 * c: client state
382 * req: request received
383 *
384 */
385 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
386 {
387 P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
388 wake_up(req->wq);
389 P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
390 }
391 EXPORT_SYMBOL(p9_client_cb);
392
393 /**
394 * p9_parse_header - parse header arguments out of a packet
395 * @pdu: packet to parse
396 * @size: size of packet
397 * @type: type of request
398 * @tag: tag of packet
399 * @rewind: set if we need to rewind offset afterwards
400 */
401
402 int
403 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
404 int rewind)
405 {
406 int8_t r_type;
407 int16_t r_tag;
408 int32_t r_size;
409 int offset = pdu->offset;
410 int err;
411
412 pdu->offset = 0;
413 if (pdu->size == 0)
414 pdu->size = 7;
415
416 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
417 if (err)
418 goto rewind_and_exit;
419
420 pdu->size = r_size;
421 pdu->id = r_type;
422 pdu->tag = r_tag;
423
424 P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size,
425 pdu->id, pdu->tag);
426
427 if (type)
428 *type = r_type;
429 if (tag)
430 *tag = r_tag;
431 if (size)
432 *size = r_size;
433
434
435 rewind_and_exit:
436 if (rewind)
437 pdu->offset = offset;
438 return err;
439 }
440 EXPORT_SYMBOL(p9_parse_header);
441
442 /**
443 * p9_check_errors - check 9p packet for error return and process it
444 * @c: current client instance
445 * @req: request to parse and check for error conditions
446 *
447 * returns error code if one is discovered, otherwise returns 0
448 *
449 * this will have to be more complicated if we have multiple
450 * error packet types
451 */
452
453 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
454 {
455 int8_t type;
456 int err;
457 int ecode;
458
459 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
460 if (err) {
461 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
462 return err;
463 }
464
465 if (type != P9_RERROR && type != P9_RLERROR)
466 return 0;
467
468 if (!p9_is_proto_dotl(c)) {
469 char *ename;
470
471 if (req->tc->pbuf_size) {
472 /* Handle user buffers */
473 size_t len = req->rc->size - req->rc->offset;
474 if (req->tc->pubuf) {
475 /* User Buffer */
476 err = copy_from_user(
477 &req->rc->sdata[req->rc->offset],
478 req->tc->pubuf, len);
479 if (err) {
480 err = -EFAULT;
481 goto out_err;
482 }
483 } else {
484 /* Kernel Buffer */
485 memmove(&req->rc->sdata[req->rc->offset],
486 req->tc->pkbuf, len);
487 }
488 }
489 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
490 &ename, &ecode);
491 if (err)
492 goto out_err;
493
494 if (p9_is_proto_dotu(c))
495 err = -ecode;
496
497 if (!err || !IS_ERR_VALUE(err)) {
498 err = p9_errstr2errno(ename, strlen(ename));
499
500 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode,
501 ename);
502
503 kfree(ename);
504 }
505 } else {
506 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
507 err = -ecode;
508
509 P9_DPRINTK(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
510 }
511
512
513 return err;
514
515 out_err:
516 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
517
518 return err;
519 }
520
521 /**
522 * p9_client_flush - flush (cancel) a request
523 * @c: client state
524 * @oldreq: request to cancel
525 *
526 * This sents a flush for a particular requests and links
527 * the flush request to the original request. The current
528 * code only supports a single flush request although the protocol
529 * allows for multiple flush requests to be sent for a single request.
530 *
531 */
532
533 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
534 {
535 struct p9_req_t *req;
536 int16_t oldtag;
537 int err;
538
539 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
540 if (err)
541 return err;
542
543 P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
544
545 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
546 if (IS_ERR(req))
547 return PTR_ERR(req);
548
549
550 /* if we haven't received a response for oldreq,
551 remove it from the list. */
552 spin_lock(&c->lock);
553 if (oldreq->status == REQ_STATUS_FLSH)
554 list_del(&oldreq->req_list);
555 spin_unlock(&c->lock);
556
557 p9_free_req(c, req);
558 return 0;
559 }
560
561 /**
562 * p9_client_rpc - issue a request and wait for a response
563 * @c: client session
564 * @type: type of request
565 * @fmt: protocol format string (see protocol.c)
566 *
567 * Returns request structure (which client must free using p9_free_req)
568 */
569
570 static struct p9_req_t *
571 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
572 {
573 va_list ap;
574 int tag, err;
575 struct p9_req_t *req;
576 unsigned long flags;
577 int sigpending;
578
579 P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
580
581 /* we allow for any status other than disconnected */
582 if (c->status == Disconnected)
583 return ERR_PTR(-EIO);
584
585 /* if status is begin_disconnected we allow only clunk request */
586 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
587 return ERR_PTR(-EIO);
588
589 if (signal_pending(current)) {
590 sigpending = 1;
591 clear_thread_flag(TIF_SIGPENDING);
592 } else
593 sigpending = 0;
594
595 tag = P9_NOTAG;
596 if (type != P9_TVERSION) {
597 tag = p9_idpool_get(c->tagpool);
598 if (tag < 0)
599 return ERR_PTR(-ENOMEM);
600 }
601
602 req = p9_tag_alloc(c, tag);
603 if (IS_ERR(req))
604 return req;
605
606 /* marshall the data */
607 p9pdu_prepare(req->tc, tag, type);
608 va_start(ap, fmt);
609 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
610 va_end(ap);
611 if (err)
612 goto reterr;
613 p9pdu_finalize(req->tc);
614
615 err = c->trans_mod->request(c, req);
616 if (err < 0) {
617 if (err != -ERESTARTSYS)
618 c->status = Disconnected;
619 goto reterr;
620 }
621
622 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag);
623 err = wait_event_interruptible(*req->wq,
624 req->status >= REQ_STATUS_RCVD);
625 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n",
626 req->wq, tag, err);
627
628 if (req->status == REQ_STATUS_ERROR) {
629 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
630 err = req->t_err;
631 }
632
633 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
634 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
635 sigpending = 1;
636 clear_thread_flag(TIF_SIGPENDING);
637
638 if (c->trans_mod->cancel(c, req))
639 p9_client_flush(c, req);
640
641 /* if we received the response anyway, don't signal error */
642 if (req->status == REQ_STATUS_RCVD)
643 err = 0;
644 }
645
646 if (sigpending) {
647 spin_lock_irqsave(&current->sighand->siglock, flags);
648 recalc_sigpending();
649 spin_unlock_irqrestore(&current->sighand->siglock, flags);
650 }
651
652 if (err < 0)
653 goto reterr;
654
655 err = p9_check_errors(c, req);
656 if (!err) {
657 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
658 return req;
659 }
660
661 reterr:
662 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
663 err);
664 p9_free_req(c, req);
665 return ERR_PTR(err);
666 }
667
668 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
669 {
670 int ret;
671 struct p9_fid *fid;
672 unsigned long flags;
673
674 P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
675 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
676 if (!fid)
677 return ERR_PTR(-ENOMEM);
678
679 ret = p9_idpool_get(clnt->fidpool);
680 if (ret < 0) {
681 ret = -ENOSPC;
682 goto error;
683 }
684 fid->fid = ret;
685
686 memset(&fid->qid, 0, sizeof(struct p9_qid));
687 fid->mode = -1;
688 fid->uid = current_fsuid();
689 fid->clnt = clnt;
690 fid->rdir = NULL;
691 spin_lock_irqsave(&clnt->lock, flags);
692 list_add(&fid->flist, &clnt->fidlist);
693 spin_unlock_irqrestore(&clnt->lock, flags);
694
695 return fid;
696
697 error:
698 kfree(fid);
699 return ERR_PTR(ret);
700 }
701
702 static void p9_fid_destroy(struct p9_fid *fid)
703 {
704 struct p9_client *clnt;
705 unsigned long flags;
706
707 P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
708 clnt = fid->clnt;
709 p9_idpool_put(fid->fid, clnt->fidpool);
710 spin_lock_irqsave(&clnt->lock, flags);
711 list_del(&fid->flist);
712 spin_unlock_irqrestore(&clnt->lock, flags);
713 kfree(fid->rdir);
714 kfree(fid);
715 }
716
717 static int p9_client_version(struct p9_client *c)
718 {
719 int err = 0;
720 struct p9_req_t *req;
721 char *version;
722 int msize;
723
724 P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
725 c->msize, c->proto_version);
726
727 switch (c->proto_version) {
728 case p9_proto_2000L:
729 req = p9_client_rpc(c, P9_TVERSION, "ds",
730 c->msize, "9P2000.L");
731 break;
732 case p9_proto_2000u:
733 req = p9_client_rpc(c, P9_TVERSION, "ds",
734 c->msize, "9P2000.u");
735 break;
736 case p9_proto_legacy:
737 req = p9_client_rpc(c, P9_TVERSION, "ds",
738 c->msize, "9P2000");
739 break;
740 default:
741 return -EINVAL;
742 break;
743 }
744
745 if (IS_ERR(req))
746 return PTR_ERR(req);
747
748 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
749 if (err) {
750 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
751 p9pdu_dump(1, req->rc);
752 goto error;
753 }
754
755 P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
756 if (!strncmp(version, "9P2000.L", 8))
757 c->proto_version = p9_proto_2000L;
758 else if (!strncmp(version, "9P2000.u", 8))
759 c->proto_version = p9_proto_2000u;
760 else if (!strncmp(version, "9P2000", 6))
761 c->proto_version = p9_proto_legacy;
762 else {
763 err = -EREMOTEIO;
764 goto error;
765 }
766
767 if (msize < c->msize)
768 c->msize = msize;
769
770 error:
771 kfree(version);
772 p9_free_req(c, req);
773
774 return err;
775 }
776
777 struct p9_client *p9_client_create(const char *dev_name, char *options)
778 {
779 int err;
780 struct p9_client *clnt;
781
782 err = 0;
783 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
784 if (!clnt)
785 return ERR_PTR(-ENOMEM);
786
787 clnt->trans_mod = NULL;
788 clnt->trans = NULL;
789 spin_lock_init(&clnt->lock);
790 INIT_LIST_HEAD(&clnt->fidlist);
791
792 p9_tag_init(clnt);
793
794 err = parse_opts(options, clnt);
795 if (err < 0)
796 goto free_client;
797
798 if (!clnt->trans_mod)
799 clnt->trans_mod = v9fs_get_default_trans();
800
801 if (clnt->trans_mod == NULL) {
802 err = -EPROTONOSUPPORT;
803 P9_DPRINTK(P9_DEBUG_ERROR,
804 "No transport defined or default transport\n");
805 goto free_client;
806 }
807
808 clnt->fidpool = p9_idpool_create();
809 if (IS_ERR(clnt->fidpool)) {
810 err = PTR_ERR(clnt->fidpool);
811 clnt->fidpool = NULL;
812 goto put_trans;
813 }
814
815 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
816 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
817
818 err = clnt->trans_mod->create(clnt, dev_name, options);
819 if (err)
820 goto destroy_fidpool;
821
822 if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize)
823 clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ;
824
825 err = p9_client_version(clnt);
826 if (err)
827 goto close_trans;
828
829 return clnt;
830
831 close_trans:
832 clnt->trans_mod->close(clnt);
833 destroy_fidpool:
834 p9_idpool_destroy(clnt->fidpool);
835 put_trans:
836 v9fs_put_trans(clnt->trans_mod);
837 free_client:
838 kfree(clnt);
839 return ERR_PTR(err);
840 }
841 EXPORT_SYMBOL(p9_client_create);
842
843 void p9_client_destroy(struct p9_client *clnt)
844 {
845 struct p9_fid *fid, *fidptr;
846
847 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt);
848
849 if (clnt->trans_mod)
850 clnt->trans_mod->close(clnt);
851
852 v9fs_put_trans(clnt->trans_mod);
853
854 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
855 printk(KERN_INFO "Found fid %d not clunked\n", fid->fid);
856 p9_fid_destroy(fid);
857 }
858
859 if (clnt->fidpool)
860 p9_idpool_destroy(clnt->fidpool);
861
862 p9_tag_cleanup(clnt);
863
864 kfree(clnt);
865 }
866 EXPORT_SYMBOL(p9_client_destroy);
867
868 void p9_client_disconnect(struct p9_client *clnt)
869 {
870 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
871 clnt->status = Disconnected;
872 }
873 EXPORT_SYMBOL(p9_client_disconnect);
874
875 void p9_client_begin_disconnect(struct p9_client *clnt)
876 {
877 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
878 clnt->status = BeginDisconnect;
879 }
880 EXPORT_SYMBOL(p9_client_begin_disconnect);
881
882 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
883 char *uname, u32 n_uname, char *aname)
884 {
885 int err;
886 struct p9_req_t *req;
887 struct p9_fid *fid;
888 struct p9_qid qid;
889
890 P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
891 afid ? afid->fid : -1, uname, aname);
892 err = 0;
893
894 fid = p9_fid_create(clnt);
895 if (IS_ERR(fid)) {
896 err = PTR_ERR(fid);
897 fid = NULL;
898 goto error;
899 }
900
901 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
902 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
903 if (IS_ERR(req)) {
904 err = PTR_ERR(req);
905 goto error;
906 }
907
908 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
909 if (err) {
910 p9pdu_dump(1, req->rc);
911 p9_free_req(clnt, req);
912 goto error;
913 }
914
915 P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
916 qid.type,
917 (unsigned long long)qid.path,
918 qid.version);
919
920 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
921
922 p9_free_req(clnt, req);
923 return fid;
924
925 error:
926 if (fid)
927 p9_fid_destroy(fid);
928 return ERR_PTR(err);
929 }
930 EXPORT_SYMBOL(p9_client_attach);
931
932 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
933 int clone)
934 {
935 int err;
936 struct p9_client *clnt;
937 struct p9_fid *fid;
938 struct p9_qid *wqids;
939 struct p9_req_t *req;
940 int16_t nwqids, count;
941
942 err = 0;
943 wqids = NULL;
944 clnt = oldfid->clnt;
945 if (clone) {
946 fid = p9_fid_create(clnt);
947 if (IS_ERR(fid)) {
948 err = PTR_ERR(fid);
949 fid = NULL;
950 goto error;
951 }
952
953 fid->uid = oldfid->uid;
954 } else
955 fid = oldfid;
956
957
958 P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n",
959 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
960
961 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
962 nwname, wnames);
963 if (IS_ERR(req)) {
964 err = PTR_ERR(req);
965 goto error;
966 }
967
968 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
969 if (err) {
970 p9pdu_dump(1, req->rc);
971 p9_free_req(clnt, req);
972 goto clunk_fid;
973 }
974 p9_free_req(clnt, req);
975
976 P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
977
978 if (nwqids != nwname) {
979 err = -ENOENT;
980 goto clunk_fid;
981 }
982
983 for (count = 0; count < nwqids; count++)
984 P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
985 count, wqids[count].type,
986 (unsigned long long)wqids[count].path,
987 wqids[count].version);
988
989 if (nwname)
990 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
991 else
992 fid->qid = oldfid->qid;
993
994 kfree(wqids);
995 return fid;
996
997 clunk_fid:
998 kfree(wqids);
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 clnt = fid->clnt;
1019 P9_DPRINTK(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1020 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1021 err = 0;
1022
1023 if (fid->mode != -1)
1024 return -EINVAL;
1025
1026 if (p9_is_proto_dotl(clnt))
1027 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1028 else
1029 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1030 if (IS_ERR(req)) {
1031 err = PTR_ERR(req);
1032 goto error;
1033 }
1034
1035 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1036 if (err) {
1037 p9pdu_dump(1, req->rc);
1038 goto free_and_error;
1039 }
1040
1041 P9_DPRINTK(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1042 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1043 (unsigned long long)qid.path, qid.version, iounit);
1044
1045 fid->mode = mode;
1046 fid->iounit = iounit;
1047
1048 free_and_error:
1049 p9_free_req(clnt, req);
1050 error:
1051 return err;
1052 }
1053 EXPORT_SYMBOL(p9_client_open);
1054
1055 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1056 gid_t gid, struct p9_qid *qid)
1057 {
1058 int err = 0;
1059 struct p9_client *clnt;
1060 struct p9_req_t *req;
1061 int iounit;
1062
1063 P9_DPRINTK(P9_DEBUG_9P,
1064 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1065 ofid->fid, name, flags, mode, gid);
1066 clnt = ofid->clnt;
1067
1068 if (ofid->mode != -1)
1069 return -EINVAL;
1070
1071 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags,
1072 mode, gid);
1073 if (IS_ERR(req)) {
1074 err = PTR_ERR(req);
1075 goto error;
1076 }
1077
1078 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1079 if (err) {
1080 p9pdu_dump(1, req->rc);
1081 goto free_and_error;
1082 }
1083
1084 P9_DPRINTK(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1085 qid->type,
1086 (unsigned long long)qid->path,
1087 qid->version, iounit);
1088
1089 ofid->mode = mode;
1090 ofid->iounit = iounit;
1091
1092 free_and_error:
1093 p9_free_req(clnt, req);
1094 error:
1095 return err;
1096 }
1097 EXPORT_SYMBOL(p9_client_create_dotl);
1098
1099 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1100 char *extension)
1101 {
1102 int err;
1103 struct p9_client *clnt;
1104 struct p9_req_t *req;
1105 struct p9_qid qid;
1106 int iounit;
1107
1108 P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1109 fid->fid, name, perm, mode);
1110 err = 0;
1111 clnt = fid->clnt;
1112
1113 if (fid->mode != -1)
1114 return -EINVAL;
1115
1116 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1117 mode, extension);
1118 if (IS_ERR(req)) {
1119 err = PTR_ERR(req);
1120 goto error;
1121 }
1122
1123 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1124 if (err) {
1125 p9pdu_dump(1, req->rc);
1126 goto free_and_error;
1127 }
1128
1129 P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1130 qid.type,
1131 (unsigned long long)qid.path,
1132 qid.version, iounit);
1133
1134 fid->mode = mode;
1135 fid->iounit = iounit;
1136
1137 free_and_error:
1138 p9_free_req(clnt, req);
1139 error:
1140 return err;
1141 }
1142 EXPORT_SYMBOL(p9_client_fcreate);
1143
1144 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid,
1145 struct p9_qid *qid)
1146 {
1147 int err = 0;
1148 struct p9_client *clnt;
1149 struct p9_req_t *req;
1150
1151 P9_DPRINTK(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1152 dfid->fid, name, symtgt);
1153 clnt = dfid->clnt;
1154
1155 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt,
1156 gid);
1157 if (IS_ERR(req)) {
1158 err = PTR_ERR(req);
1159 goto error;
1160 }
1161
1162 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1163 if (err) {
1164 p9pdu_dump(1, req->rc);
1165 goto free_and_error;
1166 }
1167
1168 P9_DPRINTK(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1169 qid->type, (unsigned long long)qid->path, qid->version);
1170
1171 free_and_error:
1172 p9_free_req(clnt, req);
1173 error:
1174 return err;
1175 }
1176 EXPORT_SYMBOL(p9_client_symlink);
1177
1178 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1179 {
1180 struct p9_client *clnt;
1181 struct p9_req_t *req;
1182
1183 P9_DPRINTK(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1184 dfid->fid, oldfid->fid, newname);
1185 clnt = dfid->clnt;
1186 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1187 newname);
1188 if (IS_ERR(req))
1189 return PTR_ERR(req);
1190
1191 P9_DPRINTK(P9_DEBUG_9P, "<<< RLINK\n");
1192 p9_free_req(clnt, req);
1193 return 0;
1194 }
1195 EXPORT_SYMBOL(p9_client_link);
1196
1197 int p9_client_fsync(struct p9_fid *fid, int datasync)
1198 {
1199 int err;
1200 struct p9_client *clnt;
1201 struct p9_req_t *req;
1202
1203 P9_DPRINTK(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1204 fid->fid, datasync);
1205 err = 0;
1206 clnt = fid->clnt;
1207
1208 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1209 if (IS_ERR(req)) {
1210 err = PTR_ERR(req);
1211 goto error;
1212 }
1213
1214 P9_DPRINTK(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1215
1216 p9_free_req(clnt, req);
1217
1218 error:
1219 return err;
1220 }
1221 EXPORT_SYMBOL(p9_client_fsync);
1222
1223 int p9_client_sync_fs(struct p9_fid *fid)
1224 {
1225 int err = 0;
1226 struct p9_req_t *req;
1227 struct p9_client *clnt;
1228
1229 P9_DPRINTK(P9_DEBUG_9P, ">>> TSYNC_FS fid %d\n", fid->fid);
1230
1231 clnt = fid->clnt;
1232 req = p9_client_rpc(clnt, P9_TSYNCFS, "d", fid->fid);
1233 if (IS_ERR(req)) {
1234 err = PTR_ERR(req);
1235 goto error;
1236 }
1237 P9_DPRINTK(P9_DEBUG_9P, "<<< RSYNCFS fid %d\n", fid->fid);
1238 p9_free_req(clnt, req);
1239 error:
1240 return err;
1241 }
1242 EXPORT_SYMBOL(p9_client_sync_fs);
1243
1244 int p9_client_clunk(struct p9_fid *fid)
1245 {
1246 int err;
1247 struct p9_client *clnt;
1248 struct p9_req_t *req;
1249
1250 if (!fid) {
1251 P9_EPRINTK(KERN_WARNING, "Trying to clunk with NULL fid\n");
1252 dump_stack();
1253 return 0;
1254 }
1255
1256 P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
1257 err = 0;
1258 clnt = fid->clnt;
1259
1260 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1261 if (IS_ERR(req)) {
1262 err = PTR_ERR(req);
1263 goto error;
1264 }
1265
1266 P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1267
1268 p9_free_req(clnt, req);
1269 p9_fid_destroy(fid);
1270
1271 error:
1272 return err;
1273 }
1274 EXPORT_SYMBOL(p9_client_clunk);
1275
1276 int p9_client_remove(struct p9_fid *fid)
1277 {
1278 int err;
1279 struct p9_client *clnt;
1280 struct p9_req_t *req;
1281
1282 P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1283 err = 0;
1284 clnt = fid->clnt;
1285
1286 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1287 if (IS_ERR(req)) {
1288 err = PTR_ERR(req);
1289 goto error;
1290 }
1291
1292 P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1293
1294 p9_free_req(clnt, req);
1295 error:
1296 p9_fid_destroy(fid);
1297 return err;
1298 }
1299 EXPORT_SYMBOL(p9_client_remove);
1300
1301 int
1302 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1303 u32 count)
1304 {
1305 int err, rsize, total;
1306 struct p9_client *clnt;
1307 struct p9_req_t *req;
1308 char *dataptr;
1309
1310 P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid,
1311 (long long unsigned) offset, count);
1312 err = 0;
1313 clnt = fid->clnt;
1314 total = 0;
1315
1316 rsize = fid->iounit;
1317 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1318 rsize = clnt->msize - P9_IOHDRSZ;
1319
1320 if (count < rsize)
1321 rsize = count;
1322
1323 /* Don't bother zerocopy form small IO (< 1024) */
1324 if (((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
1325 P9_TRANS_PREF_PAYLOAD_SEP) && (rsize > 1024)) {
1326 req = p9_client_rpc(clnt, P9_TREAD, "dqE", fid->fid, offset,
1327 rsize, data, udata);
1328 } else {
1329 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1330 rsize);
1331 }
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, &dataptr);
1338 if (err) {
1339 p9pdu_dump(1, req->rc);
1340 goto free_and_error;
1341 }
1342
1343 P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1344
1345 if (!req->tc->pbuf_size) {
1346 if (data) {
1347 memmove(data, dataptr, count);
1348 } else {
1349 err = copy_to_user(udata, dataptr, count);
1350 if (err) {
1351 err = -EFAULT;
1352 goto free_and_error;
1353 }
1354 }
1355 }
1356 p9_free_req(clnt, req);
1357 return count;
1358
1359 free_and_error:
1360 p9_free_req(clnt, req);
1361 error:
1362 return err;
1363 }
1364 EXPORT_SYMBOL(p9_client_read);
1365
1366 int
1367 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1368 u64 offset, u32 count)
1369 {
1370 int err, rsize, total;
1371 struct p9_client *clnt;
1372 struct p9_req_t *req;
1373
1374 P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1375 fid->fid, (long long unsigned) offset, count);
1376 err = 0;
1377 clnt = fid->clnt;
1378 total = 0;
1379
1380 rsize = fid->iounit;
1381 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1382 rsize = clnt->msize - P9_IOHDRSZ;
1383
1384 if (count < rsize)
1385 rsize = count;
1386
1387 /* Don't bother zerocopy form small IO (< 1024) */
1388 if (((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
1389 P9_TRANS_PREF_PAYLOAD_SEP) && (rsize > 1024)) {
1390 req = p9_client_rpc(clnt, P9_TWRITE, "dqE", fid->fid, offset,
1391 rsize, data, udata);
1392 } else {
1393
1394 if (data)
1395 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
1396 offset, rsize, data);
1397 else
1398 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
1399 offset, rsize, udata);
1400 }
1401 if (IS_ERR(req)) {
1402 err = PTR_ERR(req);
1403 goto error;
1404 }
1405
1406 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1407 if (err) {
1408 p9pdu_dump(1, req->rc);
1409 goto free_and_error;
1410 }
1411
1412 P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1413
1414 p9_free_req(clnt, req);
1415 return count;
1416
1417 free_and_error:
1418 p9_free_req(clnt, req);
1419 error:
1420 return err;
1421 }
1422 EXPORT_SYMBOL(p9_client_write);
1423
1424 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1425 {
1426 int err;
1427 struct p9_client *clnt;
1428 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1429 struct p9_req_t *req;
1430 u16 ignored;
1431
1432 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1433
1434 if (!ret)
1435 return ERR_PTR(-ENOMEM);
1436
1437 err = 0;
1438 clnt = fid->clnt;
1439
1440 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1441 if (IS_ERR(req)) {
1442 err = PTR_ERR(req);
1443 goto error;
1444 }
1445
1446 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1447 if (err) {
1448 p9pdu_dump(1, req->rc);
1449 p9_free_req(clnt, req);
1450 goto error;
1451 }
1452
1453 P9_DPRINTK(P9_DEBUG_9P,
1454 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1455 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1456 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1457 "<<< uid=%d gid=%d n_muid=%d\n",
1458 ret->size, ret->type, ret->dev, ret->qid.type,
1459 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1460 ret->atime, ret->mtime, (unsigned long long)ret->length,
1461 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1462 ret->n_uid, ret->n_gid, ret->n_muid);
1463
1464 p9_free_req(clnt, req);
1465 return ret;
1466
1467 error:
1468 kfree(ret);
1469 return ERR_PTR(err);
1470 }
1471 EXPORT_SYMBOL(p9_client_stat);
1472
1473 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1474 u64 request_mask)
1475 {
1476 int err;
1477 struct p9_client *clnt;
1478 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1479 GFP_KERNEL);
1480 struct p9_req_t *req;
1481
1482 P9_DPRINTK(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1483 fid->fid, request_mask);
1484
1485 if (!ret)
1486 return ERR_PTR(-ENOMEM);
1487
1488 err = 0;
1489 clnt = fid->clnt;
1490
1491 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1492 if (IS_ERR(req)) {
1493 err = PTR_ERR(req);
1494 goto error;
1495 }
1496
1497 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1498 if (err) {
1499 p9pdu_dump(1, req->rc);
1500 p9_free_req(clnt, req);
1501 goto error;
1502 }
1503
1504 P9_DPRINTK(P9_DEBUG_9P,
1505 "<<< RGETATTR st_result_mask=%lld\n"
1506 "<<< qid=%x.%llx.%x\n"
1507 "<<< st_mode=%8.8x st_nlink=%llu\n"
1508 "<<< st_uid=%d st_gid=%d\n"
1509 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1510 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1511 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1512 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1513 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1514 "<<< st_gen=%lld st_data_version=%lld",
1515 ret->st_result_mask, ret->qid.type, ret->qid.path,
1516 ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid,
1517 ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize,
1518 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1519 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1520 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1521 ret->st_gen, ret->st_data_version);
1522
1523 p9_free_req(clnt, req);
1524 return ret;
1525
1526 error:
1527 kfree(ret);
1528 return ERR_PTR(err);
1529 }
1530 EXPORT_SYMBOL(p9_client_getattr_dotl);
1531
1532 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1533 {
1534 int ret;
1535
1536 /* NOTE: size shouldn't include its own length */
1537 /* size[2] type[2] dev[4] qid[13] */
1538 /* mode[4] atime[4] mtime[4] length[8]*/
1539 /* name[s] uid[s] gid[s] muid[s] */
1540 ret = 2+4+13+4+4+4+8+2+2+2+2;
1541
1542 if (wst->name)
1543 ret += strlen(wst->name);
1544 if (wst->uid)
1545 ret += strlen(wst->uid);
1546 if (wst->gid)
1547 ret += strlen(wst->gid);
1548 if (wst->muid)
1549 ret += strlen(wst->muid);
1550
1551 if ((proto_version == p9_proto_2000u) ||
1552 (proto_version == p9_proto_2000L)) {
1553 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1554 if (wst->extension)
1555 ret += strlen(wst->extension);
1556 }
1557
1558 return ret;
1559 }
1560
1561 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1562 {
1563 int err;
1564 struct p9_req_t *req;
1565 struct p9_client *clnt;
1566
1567 err = 0;
1568 clnt = fid->clnt;
1569 wst->size = p9_client_statsize(wst, clnt->proto_version);
1570 P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1571 P9_DPRINTK(P9_DEBUG_9P,
1572 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1573 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1574 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1575 " uid=%d gid=%d n_muid=%d\n",
1576 wst->size, wst->type, wst->dev, wst->qid.type,
1577 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1578 wst->atime, wst->mtime, (unsigned long long)wst->length,
1579 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1580 wst->n_uid, wst->n_gid, wst->n_muid);
1581
1582 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1583 if (IS_ERR(req)) {
1584 err = PTR_ERR(req);
1585 goto error;
1586 }
1587
1588 P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1589
1590 p9_free_req(clnt, req);
1591 error:
1592 return err;
1593 }
1594 EXPORT_SYMBOL(p9_client_wstat);
1595
1596 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1597 {
1598 int err;
1599 struct p9_req_t *req;
1600 struct p9_client *clnt;
1601
1602 err = 0;
1603 clnt = fid->clnt;
1604 P9_DPRINTK(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1605 P9_DPRINTK(P9_DEBUG_9P,
1606 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1607 " atime_sec=%lld atime_nsec=%lld\n"
1608 " mtime_sec=%lld mtime_nsec=%lld\n",
1609 p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid,
1610 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1611 p9attr->mtime_sec, p9attr->mtime_nsec);
1612
1613 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1614
1615 if (IS_ERR(req)) {
1616 err = PTR_ERR(req);
1617 goto error;
1618 }
1619 P9_DPRINTK(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1620 p9_free_req(clnt, req);
1621 error:
1622 return err;
1623 }
1624 EXPORT_SYMBOL(p9_client_setattr);
1625
1626 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1627 {
1628 int err;
1629 struct p9_req_t *req;
1630 struct p9_client *clnt;
1631
1632 err = 0;
1633 clnt = fid->clnt;
1634
1635 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1636
1637 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1638 if (IS_ERR(req)) {
1639 err = PTR_ERR(req);
1640 goto error;
1641 }
1642
1643 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1644 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1645 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1646 if (err) {
1647 p9pdu_dump(1, req->rc);
1648 p9_free_req(clnt, req);
1649 goto error;
1650 }
1651
1652 P9_DPRINTK(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1653 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1654 "fsid %llu namelen %ld\n",
1655 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1656 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1657 sb->fsid, (long int)sb->namelen);
1658
1659 p9_free_req(clnt, req);
1660 error:
1661 return err;
1662 }
1663 EXPORT_SYMBOL(p9_client_statfs);
1664
1665 int p9_client_rename(struct p9_fid *fid, struct p9_fid *newdirfid, char *name)
1666 {
1667 int err;
1668 struct p9_req_t *req;
1669 struct p9_client *clnt;
1670
1671 err = 0;
1672 clnt = fid->clnt;
1673
1674 P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1675 fid->fid, newdirfid->fid, name);
1676
1677 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1678 newdirfid->fid, name);
1679 if (IS_ERR(req)) {
1680 err = PTR_ERR(req);
1681 goto error;
1682 }
1683
1684 P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1685
1686 p9_free_req(clnt, req);
1687 error:
1688 return err;
1689 }
1690 EXPORT_SYMBOL(p9_client_rename);
1691
1692 /*
1693 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1694 */
1695 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1696 const char *attr_name, u64 *attr_size)
1697 {
1698 int err;
1699 struct p9_req_t *req;
1700 struct p9_client *clnt;
1701 struct p9_fid *attr_fid;
1702
1703 err = 0;
1704 clnt = file_fid->clnt;
1705 attr_fid = p9_fid_create(clnt);
1706 if (IS_ERR(attr_fid)) {
1707 err = PTR_ERR(attr_fid);
1708 attr_fid = NULL;
1709 goto error;
1710 }
1711 P9_DPRINTK(P9_DEBUG_9P,
1712 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
1713 file_fid->fid, attr_fid->fid, attr_name);
1714
1715 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
1716 file_fid->fid, attr_fid->fid, attr_name);
1717 if (IS_ERR(req)) {
1718 err = PTR_ERR(req);
1719 goto error;
1720 }
1721 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
1722 if (err) {
1723 p9pdu_dump(1, req->rc);
1724 p9_free_req(clnt, req);
1725 goto clunk_fid;
1726 }
1727 p9_free_req(clnt, req);
1728 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
1729 attr_fid->fid, *attr_size);
1730 return attr_fid;
1731 clunk_fid:
1732 p9_client_clunk(attr_fid);
1733 attr_fid = NULL;
1734 error:
1735 if (attr_fid && (attr_fid != file_fid))
1736 p9_fid_destroy(attr_fid);
1737
1738 return ERR_PTR(err);
1739 }
1740 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
1741
1742 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
1743 u64 attr_size, int flags)
1744 {
1745 int err;
1746 struct p9_req_t *req;
1747 struct p9_client *clnt;
1748
1749 P9_DPRINTK(P9_DEBUG_9P,
1750 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
1751 fid->fid, name, (long long)attr_size, flags);
1752 err = 0;
1753 clnt = fid->clnt;
1754 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
1755 fid->fid, name, attr_size, flags);
1756 if (IS_ERR(req)) {
1757 err = PTR_ERR(req);
1758 goto error;
1759 }
1760 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
1761 p9_free_req(clnt, req);
1762 error:
1763 return err;
1764 }
1765 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
1766
1767 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
1768 {
1769 int err, rsize, total;
1770 struct p9_client *clnt;
1771 struct p9_req_t *req;
1772 char *dataptr;
1773
1774 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
1775 fid->fid, (long long unsigned) offset, count);
1776
1777 err = 0;
1778 clnt = fid->clnt;
1779 total = 0;
1780
1781 rsize = fid->iounit;
1782 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
1783 rsize = clnt->msize - P9_READDIRHDRSZ;
1784
1785 if (count < rsize)
1786 rsize = count;
1787
1788 if ((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
1789 P9_TRANS_PREF_PAYLOAD_SEP) {
1790 req = p9_client_rpc(clnt, P9_TREADDIR, "dqF", fid->fid,
1791 offset, rsize, data);
1792 } else {
1793 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
1794 offset, rsize);
1795 }
1796 if (IS_ERR(req)) {
1797 err = PTR_ERR(req);
1798 goto error;
1799 }
1800
1801 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1802 if (err) {
1803 p9pdu_dump(1, req->rc);
1804 goto free_and_error;
1805 }
1806
1807 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
1808
1809 if (!req->tc->pbuf_size && data)
1810 memmove(data, dataptr, count);
1811
1812 p9_free_req(clnt, req);
1813 return count;
1814
1815 free_and_error:
1816 p9_free_req(clnt, req);
1817 error:
1818 return err;
1819 }
1820 EXPORT_SYMBOL(p9_client_readdir);
1821
1822 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
1823 dev_t rdev, gid_t gid, struct p9_qid *qid)
1824 {
1825 int err;
1826 struct p9_client *clnt;
1827 struct p9_req_t *req;
1828
1829 err = 0;
1830 clnt = fid->clnt;
1831 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
1832 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
1833 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode,
1834 MAJOR(rdev), MINOR(rdev), gid);
1835 if (IS_ERR(req))
1836 return PTR_ERR(req);
1837
1838 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1839 if (err) {
1840 p9pdu_dump(1, req->rc);
1841 goto error;
1842 }
1843 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
1844 (unsigned long long)qid->path, qid->version);
1845
1846 error:
1847 p9_free_req(clnt, req);
1848 return err;
1849
1850 }
1851 EXPORT_SYMBOL(p9_client_mknod_dotl);
1852
1853 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
1854 gid_t gid, struct p9_qid *qid)
1855 {
1856 int err;
1857 struct p9_client *clnt;
1858 struct p9_req_t *req;
1859
1860 err = 0;
1861 clnt = fid->clnt;
1862 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
1863 fid->fid, name, mode, gid);
1864 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode,
1865 gid);
1866 if (IS_ERR(req))
1867 return PTR_ERR(req);
1868
1869 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1870 if (err) {
1871 p9pdu_dump(1, req->rc);
1872 goto error;
1873 }
1874 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
1875 (unsigned long long)qid->path, qid->version);
1876
1877 error:
1878 p9_free_req(clnt, req);
1879 return err;
1880
1881 }
1882 EXPORT_SYMBOL(p9_client_mkdir_dotl);
1883
1884 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
1885 {
1886 int err;
1887 struct p9_client *clnt;
1888 struct p9_req_t *req;
1889
1890 err = 0;
1891 clnt = fid->clnt;
1892 P9_DPRINTK(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
1893 "start %lld length %lld proc_id %d client_id %s\n",
1894 fid->fid, flock->type, flock->flags, flock->start,
1895 flock->length, flock->proc_id, flock->client_id);
1896
1897 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
1898 flock->flags, flock->start, flock->length,
1899 flock->proc_id, flock->client_id);
1900
1901 if (IS_ERR(req))
1902 return PTR_ERR(req);
1903
1904 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
1905 if (err) {
1906 p9pdu_dump(1, req->rc);
1907 goto error;
1908 }
1909 P9_DPRINTK(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
1910 error:
1911 p9_free_req(clnt, req);
1912 return err;
1913
1914 }
1915 EXPORT_SYMBOL(p9_client_lock_dotl);
1916
1917 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
1918 {
1919 int err;
1920 struct p9_client *clnt;
1921 struct p9_req_t *req;
1922
1923 err = 0;
1924 clnt = fid->clnt;
1925 P9_DPRINTK(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
1926 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
1927 glock->start, glock->length, glock->proc_id, glock->client_id);
1928
1929 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
1930 glock->start, glock->length, glock->proc_id, glock->client_id);
1931
1932 if (IS_ERR(req))
1933 return PTR_ERR(req);
1934
1935 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
1936 &glock->start, &glock->length, &glock->proc_id,
1937 &glock->client_id);
1938 if (err) {
1939 p9pdu_dump(1, req->rc);
1940 goto error;
1941 }
1942 P9_DPRINTK(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
1943 "proc_id %d client_id %s\n", glock->type, glock->start,
1944 glock->length, glock->proc_id, glock->client_id);
1945 error:
1946 p9_free_req(clnt, req);
1947 return err;
1948 }
1949 EXPORT_SYMBOL(p9_client_getlock_dotl);
1950
1951 int p9_client_readlink(struct p9_fid *fid, char **target)
1952 {
1953 int err;
1954 struct p9_client *clnt;
1955 struct p9_req_t *req;
1956
1957 err = 0;
1958 clnt = fid->clnt;
1959 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
1960
1961 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
1962 if (IS_ERR(req))
1963 return PTR_ERR(req);
1964
1965 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
1966 if (err) {
1967 p9pdu_dump(1, req->rc);
1968 goto error;
1969 }
1970 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
1971 error:
1972 p9_free_req(clnt, req);
1973 return err;
1974 }
1975 EXPORT_SYMBOL(p9_client_readlink);
kernel source for telekom puls (alcatel/mediatek)