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net/9p: Handle the server returned error properly
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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
46enum {
47 Opt_msize,
48 Opt_trans,
49 Opt_legacy,
50 Opt_version,
51 Opt_err,
52};
53
54static 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
62inline int p9_is_proto_dotl(struct p9_client *clnt)
63{
64 return (clnt->proto_version == p9_proto_2000L);
65}
66EXPORT_SYMBOL(p9_is_proto_dotl);
67
68inline int p9_is_proto_dotu(struct p9_client *clnt)
69{
70 return (clnt->proto_version == p9_proto_2000u);
71}
72EXPORT_SYMBOL(p9_is_proto_dotu);
73
74/* Interpret mount option for protocol version */
75static 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
95static struct p9_req_t *
96p9_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
106static 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
170free_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
190static 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
267struct 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}
282EXPORT_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
292static 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;
306error:
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 */
317static 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
356static 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 */
372void 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}
378EXPORT_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
389int
390p9_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
422rewind_and_exit:
423 if (rewind)
424 pdu->offset = offset;
425 return err;
426}
427EXPORT_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
440static 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 p9_is_proto_dotl(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 } else
474 err = 0;
475
476 return err;
477}
478
479/**
480 * p9_client_flush - flush (cancel) a request
481 * @c: client state
482 * @oldreq: request to cancel
483 *
484 * This sents a flush for a particular requests and links
485 * the flush request to the original request. The current
486 * code only supports a single flush request although the protocol
487 * allows for multiple flush requests to be sent for a single request.
488 *
489 */
490
491static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
492{
493 struct p9_req_t *req;
494 int16_t oldtag;
495 int err;
496
497 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
498 if (err)
499 return err;
500
501 P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
502
503 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
504 if (IS_ERR(req))
505 return PTR_ERR(req);
506
507
508 /* if we haven't received a response for oldreq,
509 remove it from the list. */
510 spin_lock(&c->lock);
511 if (oldreq->status == REQ_STATUS_FLSH)
512 list_del(&oldreq->req_list);
513 spin_unlock(&c->lock);
514
515 p9_free_req(c, req);
516 return 0;
517}
518
519/**
520 * p9_client_rpc - issue a request and wait for a response
521 * @c: client session
522 * @type: type of request
523 * @fmt: protocol format string (see protocol.c)
524 *
525 * Returns request structure (which client must free using p9_free_req)
526 */
527
528static struct p9_req_t *
529p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
530{
531 va_list ap;
532 int tag, err;
533 struct p9_req_t *req;
534 unsigned long flags;
535 int sigpending;
536
537 P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
538
539 /* we allow for any status other than disconnected */
540 if (c->status == Disconnected)
541 return ERR_PTR(-EIO);
542
543 /* if status is begin_disconnected we allow only clunk request */
544 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
545 return ERR_PTR(-EIO);
546
547 if (signal_pending(current)) {
548 sigpending = 1;
549 clear_thread_flag(TIF_SIGPENDING);
550 } else
551 sigpending = 0;
552
553 tag = P9_NOTAG;
554 if (type != P9_TVERSION) {
555 tag = p9_idpool_get(c->tagpool);
556 if (tag < 0)
557 return ERR_PTR(-ENOMEM);
558 }
559
560 req = p9_tag_alloc(c, tag);
561 if (IS_ERR(req))
562 return req;
563
564 /* marshall the data */
565 p9pdu_prepare(req->tc, tag, type);
566 va_start(ap, fmt);
567 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
568 va_end(ap);
569 p9pdu_finalize(req->tc);
570
571 err = c->trans_mod->request(c, req);
572 if (err < 0) {
573 c->status = Disconnected;
574 goto reterr;
575 }
576
577 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag);
578 err = wait_event_interruptible(*req->wq,
579 req->status >= REQ_STATUS_RCVD);
580 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n",
581 req->wq, tag, err);
582
583 if (req->status == REQ_STATUS_ERROR) {
584 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
585 err = req->t_err;
586 }
587
588 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
589 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
590 sigpending = 1;
591 clear_thread_flag(TIF_SIGPENDING);
592
593 if (c->trans_mod->cancel(c, req))
594 p9_client_flush(c, req);
595
596 /* if we received the response anyway, don't signal error */
597 if (req->status == REQ_STATUS_RCVD)
598 err = 0;
599 }
600
601 if (sigpending) {
602 spin_lock_irqsave(&current->sighand->siglock, flags);
603 recalc_sigpending();
604 spin_unlock_irqrestore(&current->sighand->siglock, flags);
605 }
606
607 if (err < 0)
608 goto reterr;
609
610 err = p9_check_errors(c, req);
611 if (!err) {
612 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
613 return req;
614 }
615
616reterr:
617 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
618 err);
619 p9_free_req(c, req);
620 return ERR_PTR(err);
621}
622
623static struct p9_fid *p9_fid_create(struct p9_client *clnt)
624{
625 int ret;
626 struct p9_fid *fid;
627 unsigned long flags;
628
629 P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
630 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
631 if (!fid)
632 return ERR_PTR(-ENOMEM);
633
634 ret = p9_idpool_get(clnt->fidpool);
635 if (ret < 0) {
636 ret = -ENOSPC;
637 goto error;
638 }
639 fid->fid = ret;
640
641 memset(&fid->qid, 0, sizeof(struct p9_qid));
642 fid->mode = -1;
643 fid->uid = current_fsuid();
644 fid->clnt = clnt;
645 fid->rdir = NULL;
646 spin_lock_irqsave(&clnt->lock, flags);
647 list_add(&fid->flist, &clnt->fidlist);
648 spin_unlock_irqrestore(&clnt->lock, flags);
649
650 return fid;
651
652error:
653 kfree(fid);
654 return ERR_PTR(ret);
655}
656
657static void p9_fid_destroy(struct p9_fid *fid)
658{
659 struct p9_client *clnt;
660 unsigned long flags;
661
662 P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
663 clnt = fid->clnt;
664 p9_idpool_put(fid->fid, clnt->fidpool);
665 spin_lock_irqsave(&clnt->lock, flags);
666 list_del(&fid->flist);
667 spin_unlock_irqrestore(&clnt->lock, flags);
668 kfree(fid->rdir);
669 kfree(fid);
670}
671
672int p9_client_version(struct p9_client *c)
673{
674 int err = 0;
675 struct p9_req_t *req;
676 char *version;
677 int msize;
678
679 P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
680 c->msize, c->proto_version);
681
682 switch (c->proto_version) {
683 case p9_proto_2000L:
684 req = p9_client_rpc(c, P9_TVERSION, "ds",
685 c->msize, "9P2000.L");
686 break;
687 case p9_proto_2000u:
688 req = p9_client_rpc(c, P9_TVERSION, "ds",
689 c->msize, "9P2000.u");
690 break;
691 case p9_proto_legacy:
692 req = p9_client_rpc(c, P9_TVERSION, "ds",
693 c->msize, "9P2000");
694 break;
695 default:
696 return -EINVAL;
697 break;
698 }
699
700 if (IS_ERR(req))
701 return PTR_ERR(req);
702
703 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
704 if (err) {
705 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
706 p9pdu_dump(1, req->rc);
707 goto error;
708 }
709
710 P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
711 if (!strncmp(version, "9P2000.L", 8))
712 c->proto_version = p9_proto_2000L;
713 else if (!strncmp(version, "9P2000.u", 8))
714 c->proto_version = p9_proto_2000u;
715 else if (!strncmp(version, "9P2000", 6))
716 c->proto_version = p9_proto_legacy;
717 else {
718 err = -EREMOTEIO;
719 goto error;
720 }
721
722 if (msize < c->msize)
723 c->msize = msize;
724
725error:
726 kfree(version);
727 p9_free_req(c, req);
728
729 return err;
730}
731EXPORT_SYMBOL(p9_client_version);
732
733struct p9_client *p9_client_create(const char *dev_name, char *options)
734{
735 int err;
736 struct p9_client *clnt;
737
738 err = 0;
739 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
740 if (!clnt)
741 return ERR_PTR(-ENOMEM);
742
743 clnt->trans_mod = NULL;
744 clnt->trans = NULL;
745 spin_lock_init(&clnt->lock);
746 INIT_LIST_HEAD(&clnt->fidlist);
747
748 p9_tag_init(clnt);
749
750 err = parse_opts(options, clnt);
751 if (err < 0)
752 goto free_client;
753
754 if (!clnt->trans_mod)
755 clnt->trans_mod = v9fs_get_default_trans();
756
757 if (clnt->trans_mod == NULL) {
758 err = -EPROTONOSUPPORT;
759 P9_DPRINTK(P9_DEBUG_ERROR,
760 "No transport defined or default transport\n");
761 goto free_client;
762 }
763
764 clnt->fidpool = p9_idpool_create();
765 if (IS_ERR(clnt->fidpool)) {
766 err = PTR_ERR(clnt->fidpool);
767 clnt->fidpool = NULL;
768 goto put_trans;
769 }
770
771 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
772 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
773
774 err = clnt->trans_mod->create(clnt, dev_name, options);
775 if (err)
776 goto destroy_fidpool;
777
778 if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize)
779 clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ;
780
781 err = p9_client_version(clnt);
782 if (err)
783 goto close_trans;
784
785 return clnt;
786
787close_trans:
788 clnt->trans_mod->close(clnt);
789destroy_fidpool:
790 p9_idpool_destroy(clnt->fidpool);
791put_trans:
792 v9fs_put_trans(clnt->trans_mod);
793free_client:
794 kfree(clnt);
795 return ERR_PTR(err);
796}
797EXPORT_SYMBOL(p9_client_create);
798
799void p9_client_destroy(struct p9_client *clnt)
800{
801 struct p9_fid *fid, *fidptr;
802
803 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt);
804
805 if (clnt->trans_mod)
806 clnt->trans_mod->close(clnt);
807
808 v9fs_put_trans(clnt->trans_mod);
809
810 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
811 printk(KERN_INFO "Found fid %d not clunked\n", fid->fid);
812 p9_fid_destroy(fid);
813 }
814
815 if (clnt->fidpool)
816 p9_idpool_destroy(clnt->fidpool);
817
818 p9_tag_cleanup(clnt);
819
820 kfree(clnt);
821}
822EXPORT_SYMBOL(p9_client_destroy);
823
824void p9_client_disconnect(struct p9_client *clnt)
825{
826 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
827 clnt->status = Disconnected;
828}
829EXPORT_SYMBOL(p9_client_disconnect);
830
831void p9_client_begin_disconnect(struct p9_client *clnt)
832{
833 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
834 clnt->status = BeginDisconnect;
835}
836EXPORT_SYMBOL(p9_client_begin_disconnect);
837
838struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
839 char *uname, u32 n_uname, char *aname)
840{
841 int err;
842 struct p9_req_t *req;
843 struct p9_fid *fid;
844 struct p9_qid qid;
845
846 P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
847 afid ? afid->fid : -1, uname, aname);
848 err = 0;
849
850 fid = p9_fid_create(clnt);
851 if (IS_ERR(fid)) {
852 err = PTR_ERR(fid);
853 fid = NULL;
854 goto error;
855 }
856
857 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
858 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
859 if (IS_ERR(req)) {
860 err = PTR_ERR(req);
861 goto error;
862 }
863
864 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
865 if (err) {
866 p9pdu_dump(1, req->rc);
867 p9_free_req(clnt, req);
868 goto error;
869 }
870
871 P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
872 qid.type,
873 (unsigned long long)qid.path,
874 qid.version);
875
876 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
877
878 p9_free_req(clnt, req);
879 return fid;
880
881error:
882 if (fid)
883 p9_fid_destroy(fid);
884 return ERR_PTR(err);
885}
886EXPORT_SYMBOL(p9_client_attach);
887
888struct p9_fid *
889p9_client_auth(struct p9_client *clnt, char *uname, u32 n_uname, char *aname)
890{
891 int err;
892 struct p9_req_t *req;
893 struct p9_qid qid;
894 struct p9_fid *afid;
895
896 P9_DPRINTK(P9_DEBUG_9P, ">>> TAUTH uname %s aname %s\n", uname, aname);
897 err = 0;
898
899 afid = p9_fid_create(clnt);
900 if (IS_ERR(afid)) {
901 err = PTR_ERR(afid);
902 afid = NULL;
903 goto error;
904 }
905
906 req = p9_client_rpc(clnt, P9_TAUTH, "dss?d",
907 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
908 if (IS_ERR(req)) {
909 err = PTR_ERR(req);
910 goto error;
911 }
912
913 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
914 if (err) {
915 p9pdu_dump(1, req->rc);
916 p9_free_req(clnt, req);
917 goto error;
918 }
919
920 P9_DPRINTK(P9_DEBUG_9P, "<<< RAUTH qid %x.%llx.%x\n",
921 qid.type,
922 (unsigned long long)qid.path,
923 qid.version);
924
925 memmove(&afid->qid, &qid, sizeof(struct p9_qid));
926 p9_free_req(clnt, req);
927 return afid;
928
929error:
930 if (afid)
931 p9_fid_destroy(afid);
932 return ERR_PTR(err);
933}
934EXPORT_SYMBOL(p9_client_auth);
935
936struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
937 int clone)
938{
939 int err;
940 struct p9_client *clnt;
941 struct p9_fid *fid;
942 struct p9_qid *wqids;
943 struct p9_req_t *req;
944 int16_t nwqids, count;
945
946 err = 0;
947 clnt = oldfid->clnt;
948 if (clone) {
949 fid = p9_fid_create(clnt);
950 if (IS_ERR(fid)) {
951 err = PTR_ERR(fid);
952 fid = NULL;
953 goto error;
954 }
955
956 fid->uid = oldfid->uid;
957 } else
958 fid = oldfid;
959
960
961 P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n",
962 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
963
964 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
965 nwname, wnames);
966 if (IS_ERR(req)) {
967 err = PTR_ERR(req);
968 goto error;
969 }
970
971 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
972 if (err) {
973 p9pdu_dump(1, req->rc);
974 p9_free_req(clnt, req);
975 goto clunk_fid;
976 }
977 p9_free_req(clnt, req);
978
979 P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
980
981 if (nwqids != nwname) {
982 err = -ENOENT;
983 goto clunk_fid;
984 }
985
986 for (count = 0; count < nwqids; count++)
987 P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
988 count, wqids[count].type,
989 (unsigned long long)wqids[count].path,
990 wqids[count].version);
991
992 if (nwname)
993 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
994 else
995 fid->qid = oldfid->qid;
996
997 return fid;
998
999clunk_fid:
1000 p9_client_clunk(fid);
1001 fid = NULL;
1002
1003error:
1004 if (fid && (fid != oldfid))
1005 p9_fid_destroy(fid);
1006
1007 return ERR_PTR(err);
1008}
1009EXPORT_SYMBOL(p9_client_walk);
1010
1011int p9_client_open(struct p9_fid *fid, int mode)
1012{
1013 int err;
1014 struct p9_client *clnt;
1015 struct p9_req_t *req;
1016 struct p9_qid qid;
1017 int iounit;
1018
1019 P9_DPRINTK(P9_DEBUG_9P, ">>> TOPEN fid %d mode %d\n", fid->fid, mode);
1020 err = 0;
1021 clnt = fid->clnt;
1022
1023 if (fid->mode != -1)
1024 return -EINVAL;
1025
1026 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1027 if (IS_ERR(req)) {
1028 err = PTR_ERR(req);
1029 goto error;
1030 }
1031
1032 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1033 if (err) {
1034 p9pdu_dump(1, req->rc);
1035 goto free_and_error;
1036 }
1037
1038 P9_DPRINTK(P9_DEBUG_9P, "<<< ROPEN qid %x.%llx.%x iounit %x\n",
1039 qid.type,
1040 (unsigned long long)qid.path,
1041 qid.version, iounit);
1042
1043 fid->mode = mode;
1044 fid->iounit = iounit;
1045
1046free_and_error:
1047 p9_free_req(clnt, req);
1048error:
1049 return err;
1050}
1051EXPORT_SYMBOL(p9_client_open);
1052
1053int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1054 char *extension)
1055{
1056 int err;
1057 struct p9_client *clnt;
1058 struct p9_req_t *req;
1059 struct p9_qid qid;
1060 int iounit;
1061
1062 P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1063 fid->fid, name, perm, mode);
1064 err = 0;
1065 clnt = fid->clnt;
1066
1067 if (fid->mode != -1)
1068 return -EINVAL;
1069
1070 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1071 mode, extension);
1072 if (IS_ERR(req)) {
1073 err = PTR_ERR(req);
1074 goto error;
1075 }
1076
1077 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1078 if (err) {
1079 p9pdu_dump(1, req->rc);
1080 goto free_and_error;
1081 }
1082
1083 P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1084 qid.type,
1085 (unsigned long long)qid.path,
1086 qid.version, iounit);
1087
1088 fid->mode = mode;
1089 fid->iounit = iounit;
1090
1091free_and_error:
1092 p9_free_req(clnt, req);
1093error:
1094 return err;
1095}
1096EXPORT_SYMBOL(p9_client_fcreate);
1097
1098int p9_client_clunk(struct p9_fid *fid)
1099{
1100 int err;
1101 struct p9_client *clnt;
1102 struct p9_req_t *req;
1103
1104 P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
1105 err = 0;
1106 clnt = fid->clnt;
1107
1108 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1109 if (IS_ERR(req)) {
1110 err = PTR_ERR(req);
1111 goto error;
1112 }
1113
1114 P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1115
1116 p9_free_req(clnt, req);
1117 p9_fid_destroy(fid);
1118
1119error:
1120 return err;
1121}
1122EXPORT_SYMBOL(p9_client_clunk);
1123
1124int p9_client_remove(struct p9_fid *fid)
1125{
1126 int err;
1127 struct p9_client *clnt;
1128 struct p9_req_t *req;
1129
1130 P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1131 err = 0;
1132 clnt = fid->clnt;
1133
1134 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1135 if (IS_ERR(req)) {
1136 err = PTR_ERR(req);
1137 goto error;
1138 }
1139
1140 P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1141
1142 p9_free_req(clnt, req);
1143 p9_fid_destroy(fid);
1144
1145error:
1146 return err;
1147}
1148EXPORT_SYMBOL(p9_client_remove);
1149
1150int
1151p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1152 u32 count)
1153{
1154 int err, rsize, total;
1155 struct p9_client *clnt;
1156 struct p9_req_t *req;
1157 char *dataptr;
1158
1159 P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid,
1160 (long long unsigned) offset, count);
1161 err = 0;
1162 clnt = fid->clnt;
1163 total = 0;
1164
1165 rsize = fid->iounit;
1166 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1167 rsize = clnt->msize - P9_IOHDRSZ;
1168
1169 if (count < rsize)
1170 rsize = count;
1171
1172 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, rsize);
1173 if (IS_ERR(req)) {
1174 err = PTR_ERR(req);
1175 goto error;
1176 }
1177
1178 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1179 if (err) {
1180 p9pdu_dump(1, req->rc);
1181 goto free_and_error;
1182 }
1183
1184 P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1185
1186 if (data) {
1187 memmove(data, dataptr, count);
1188 }
1189
1190 if (udata) {
1191 err = copy_to_user(udata, dataptr, count);
1192 if (err) {
1193 err = -EFAULT;
1194 goto free_and_error;
1195 }
1196 }
1197
1198 p9_free_req(clnt, req);
1199 return count;
1200
1201free_and_error:
1202 p9_free_req(clnt, req);
1203error:
1204 return err;
1205}
1206EXPORT_SYMBOL(p9_client_read);
1207
1208int
1209p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1210 u64 offset, u32 count)
1211{
1212 int err, rsize, total;
1213 struct p9_client *clnt;
1214 struct p9_req_t *req;
1215
1216 P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1217 fid->fid, (long long unsigned) offset, count);
1218 err = 0;
1219 clnt = fid->clnt;
1220 total = 0;
1221
1222 rsize = fid->iounit;
1223 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1224 rsize = clnt->msize - P9_IOHDRSZ;
1225
1226 if (count < rsize)
1227 rsize = count;
1228 if (data)
1229 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, offset,
1230 rsize, data);
1231 else
1232 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, offset,
1233 rsize, udata);
1234 if (IS_ERR(req)) {
1235 err = PTR_ERR(req);
1236 goto error;
1237 }
1238
1239 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1240 if (err) {
1241 p9pdu_dump(1, req->rc);
1242 goto free_and_error;
1243 }
1244
1245 P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1246
1247 p9_free_req(clnt, req);
1248 return count;
1249
1250free_and_error:
1251 p9_free_req(clnt, req);
1252error:
1253 return err;
1254}
1255EXPORT_SYMBOL(p9_client_write);
1256
1257struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1258{
1259 int err;
1260 struct p9_client *clnt;
1261 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1262 struct p9_req_t *req;
1263 u16 ignored;
1264
1265 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1266
1267 if (!ret)
1268 return ERR_PTR(-ENOMEM);
1269
1270 err = 0;
1271 clnt = fid->clnt;
1272
1273 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1274 if (IS_ERR(req)) {
1275 err = PTR_ERR(req);
1276 goto error;
1277 }
1278
1279 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1280 if (err) {
1281 p9pdu_dump(1, req->rc);
1282 p9_free_req(clnt, req);
1283 goto error;
1284 }
1285
1286 P9_DPRINTK(P9_DEBUG_9P,
1287 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1288 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1289 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1290 "<<< uid=%d gid=%d n_muid=%d\n",
1291 ret->size, ret->type, ret->dev, ret->qid.type,
1292 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1293 ret->atime, ret->mtime, (unsigned long long)ret->length,
1294 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1295 ret->n_uid, ret->n_gid, ret->n_muid);
1296
1297 p9_free_req(clnt, req);
1298 return ret;
1299
1300error:
1301 kfree(ret);
1302 return ERR_PTR(err);
1303}
1304EXPORT_SYMBOL(p9_client_stat);
1305
1306static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1307{
1308 int ret;
1309
1310 /* NOTE: size shouldn't include its own length */
1311 /* size[2] type[2] dev[4] qid[13] */
1312 /* mode[4] atime[4] mtime[4] length[8]*/
1313 /* name[s] uid[s] gid[s] muid[s] */
1314 ret = 2+4+13+4+4+4+8+2+2+2+2;
1315
1316 if (wst->name)
1317 ret += strlen(wst->name);
1318 if (wst->uid)
1319 ret += strlen(wst->uid);
1320 if (wst->gid)
1321 ret += strlen(wst->gid);
1322 if (wst->muid)
1323 ret += strlen(wst->muid);
1324
1325 if ((proto_version == p9_proto_2000u) ||
1326 (proto_version == p9_proto_2000L)) {
1327 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1328 if (wst->extension)
1329 ret += strlen(wst->extension);
1330 }
1331
1332 return ret;
1333}
1334
1335int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1336{
1337 int err;
1338 struct p9_req_t *req;
1339 struct p9_client *clnt;
1340
1341 err = 0;
1342 clnt = fid->clnt;
1343 wst->size = p9_client_statsize(wst, clnt->proto_version);
1344 P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1345 P9_DPRINTK(P9_DEBUG_9P,
1346 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1347 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1348 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1349 " uid=%d gid=%d n_muid=%d\n",
1350 wst->size, wst->type, wst->dev, wst->qid.type,
1351 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1352 wst->atime, wst->mtime, (unsigned long long)wst->length,
1353 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1354 wst->n_uid, wst->n_gid, wst->n_muid);
1355
1356 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1357 if (IS_ERR(req)) {
1358 err = PTR_ERR(req);
1359 goto error;
1360 }
1361
1362 P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1363
1364 p9_free_req(clnt, req);
1365error:
1366 return err;
1367}
1368EXPORT_SYMBOL(p9_client_wstat);
1369
1370int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1371{
1372 int err;
1373 struct p9_req_t *req;
1374 struct p9_client *clnt;
1375
1376 err = 0;
1377 clnt = fid->clnt;
1378
1379 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1380
1381 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1382 if (IS_ERR(req)) {
1383 err = PTR_ERR(req);
1384 goto error;
1385 }
1386
1387 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1388 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1389 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1390 if (err) {
1391 p9pdu_dump(1, req->rc);
1392 p9_free_req(clnt, req);
1393 goto error;
1394 }
1395
1396 P9_DPRINTK(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1397 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1398 "fsid %llu namelen %ld\n",
1399 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1400 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1401 sb->fsid, (long int)sb->namelen);
1402
1403 p9_free_req(clnt, req);
1404error:
1405 return err;
1406}
1407EXPORT_SYMBOL(p9_client_statfs);
1408
1409int p9_client_rename(struct p9_fid *fid, struct p9_fid *newdirfid, char *name)
1410{
1411 int err;
1412 struct p9_req_t *req;
1413 struct p9_client *clnt;
1414
1415 err = 0;
1416 clnt = fid->clnt;
1417
1418 P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1419 fid->fid, newdirfid->fid, name);
1420
1421 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1422 newdirfid->fid, name);
1423 if (IS_ERR(req)) {
1424 err = PTR_ERR(req);
1425 goto error;
1426 }
1427
1428 P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1429
1430 p9_free_req(clnt, req);
1431error:
1432 return err;
1433}
1434EXPORT_SYMBOL(p9_client_rename);
1435
1436int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
1437{
1438 int err, rsize, total;
1439 struct p9_client *clnt;
1440 struct p9_req_t *req;
1441 char *dataptr;
1442
1443 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
1444 fid->fid, (long long unsigned) offset, count);
1445
1446 err = 0;
1447 clnt = fid->clnt;
1448 total = 0;
1449
1450 rsize = fid->iounit;
1451 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
1452 rsize = clnt->msize - P9_READDIRHDRSZ;
1453
1454 if (count < rsize)
1455 rsize = count;
1456
1457 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, offset, rsize);
1458 if (IS_ERR(req)) {
1459 err = PTR_ERR(req);
1460 goto error;
1461 }
1462
1463 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1464 if (err) {
1465 p9pdu_dump(1, req->rc);
1466 goto free_and_error;
1467 }
1468
1469 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
1470
1471 if (data)
1472 memmove(data, dataptr, count);
1473
1474 p9_free_req(clnt, req);
1475 return count;
1476
1477free_and_error:
1478 p9_free_req(clnt, req);
1479error:
1480 return err;
1481}
1482EXPORT_SYMBOL(p9_client_readdir);
Clone of davem's net-next-2.6 tree