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TPM: Zero buffer whole after copying to userspace
[linux/fpc-iii.git] / net / 9p / client.c
blob776618cd2be5c122fecaf31934f06d74fff2b450
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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
27
28 #include <linux/module.h>
29 #include <linux/errno.h>
30 #include <linux/fs.h>
31 #include <linux/poll.h>
32 #include <linux/idr.h>
33 #include <linux/mutex.h>
34 #include <linux/slab.h>
35 #include <linux/sched.h>
36 #include <linux/uaccess.h>
37 #include <net/9p/9p.h>
38 #include <linux/parser.h>
39 #include <net/9p/client.h>
40 #include <net/9p/transport.h>
41 #include "protocol.h"
42
43 #define CREATE_TRACE_POINTS
44 #include <trace/events/9p.h>
45
46 /*
47 * Client Option Parsing (code inspired by NFS code)
48 * - a little lazy - parse all client options
49 */
50
51 enum {
52 Opt_msize,
53 Opt_trans,
54 Opt_legacy,
55 Opt_version,
56 Opt_err,
57 };
58
59 static const match_table_t tokens = {
60 {Opt_msize, "msize=%u"},
61 {Opt_legacy, "noextend"},
62 {Opt_trans, "trans=%s"},
63 {Opt_version, "version=%s"},
64 {Opt_err, NULL},
65 };
66
67 inline int p9_is_proto_dotl(struct p9_client *clnt)
68 {
69 return clnt->proto_version == p9_proto_2000L;
70 }
71 EXPORT_SYMBOL(p9_is_proto_dotl);
72
73 inline int p9_is_proto_dotu(struct p9_client *clnt)
74 {
75 return clnt->proto_version == p9_proto_2000u;
76 }
77 EXPORT_SYMBOL(p9_is_proto_dotu);
78
79 /* Interpret mount option for protocol version */
80 static int get_protocol_version(char *s)
81 {
82 int version = -EINVAL;
83
84 if (!strcmp(s, "9p2000")) {
85 version = p9_proto_legacy;
86 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n");
87 } else if (!strcmp(s, "9p2000.u")) {
88 version = p9_proto_2000u;
89 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
90 } else if (!strcmp(s, "9p2000.L")) {
91 version = p9_proto_2000L;
92 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
93 } else
94 pr_info("Unknown protocol version %s\n", s);
95
96 return version;
97 }
98
99 /**
100 * parse_options - parse mount options into client structure
101 * @opts: options string passed from mount
102 * @clnt: existing v9fs client information
103 *
104 * Return 0 upon success, -ERRNO upon failure
105 */
106
107 static int parse_opts(char *opts, struct p9_client *clnt)
108 {
109 char *options, *tmp_options;
110 char *p;
111 substring_t args[MAX_OPT_ARGS];
112 int option;
113 char *s;
114 int ret = 0;
115
116 clnt->proto_version = p9_proto_2000u;
117 clnt->msize = 8192;
118
119 if (!opts)
120 return 0;
121
122 tmp_options = kstrdup(opts, GFP_KERNEL);
123 if (!tmp_options) {
124 p9_debug(P9_DEBUG_ERROR,
125 "failed to allocate copy of option string\n");
126 return -ENOMEM;
127 }
128 options = tmp_options;
129
130 while ((p = strsep(&options, ",")) != NULL) {
131 int token, r;
132 if (!*p)
133 continue;
134 token = match_token(p, tokens, args);
135 switch (token) {
136 case Opt_msize:
137 r = match_int(&args[0], &option);
138 if (r < 0) {
139 p9_debug(P9_DEBUG_ERROR,
140 "integer field, but no integer?\n");
141 ret = r;
142 continue;
143 }
144 clnt->msize = option;
145 break;
146 case Opt_trans:
147 s = match_strdup(&args[0]);
148 if (!s) {
149 ret = -ENOMEM;
150 p9_debug(P9_DEBUG_ERROR,
151 "problem allocating copy of trans arg\n");
152 goto free_and_return;
153 }
154 clnt->trans_mod = v9fs_get_trans_by_name(s);
155 if (clnt->trans_mod == NULL) {
156 pr_info("Could not find request transport: %s\n",
157 s);
158 ret = -EINVAL;
159 kfree(s);
160 goto free_and_return;
161 }
162 kfree(s);
163 break;
164 case Opt_legacy:
165 clnt->proto_version = p9_proto_legacy;
166 break;
167 case Opt_version:
168 s = match_strdup(&args[0]);
169 if (!s) {
170 ret = -ENOMEM;
171 p9_debug(P9_DEBUG_ERROR,
172 "problem allocating copy of version arg\n");
173 goto free_and_return;
174 }
175 ret = get_protocol_version(s);
176 if (ret == -EINVAL) {
177 kfree(s);
178 goto free_and_return;
179 }
180 kfree(s);
181 clnt->proto_version = ret;
182 break;
183 default:
184 continue;
185 }
186 }
187
188 free_and_return:
189 kfree(tmp_options);
190 return ret;
191 }
192
193 /**
194 * p9_tag_alloc - lookup/allocate a request by tag
195 * @c: client session to lookup tag within
196 * @tag: numeric id for transaction
197 *
198 * this is a simple array lookup, but will grow the
199 * request_slots as necessary to accommodate transaction
200 * ids which did not previously have a slot.
201 *
202 * this code relies on the client spinlock to manage locks, its
203 * possible we should switch to something else, but I'd rather
204 * stick with something low-overhead for the common case.
205 *
206 */
207
208 static struct p9_req_t *
209 p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
210 {
211 unsigned long flags;
212 int row, col;
213 struct p9_req_t *req;
214 int alloc_msize = min(c->msize, max_size);
215
216 /* This looks up the original request by tag so we know which
217 * buffer to read the data into */
218 tag++;
219
220 if (tag >= c->max_tag) {
221 spin_lock_irqsave(&c->lock, flags);
222 /* check again since original check was outside of lock */
223 while (tag >= c->max_tag) {
224 row = (tag / P9_ROW_MAXTAG);
225 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
226 sizeof(struct p9_req_t), GFP_ATOMIC);
227
228 if (!c->reqs[row]) {
229 pr_err("Couldn't grow tag array\n");
230 spin_unlock_irqrestore(&c->lock, flags);
231 return ERR_PTR(-ENOMEM);
232 }
233 for (col = 0; col < P9_ROW_MAXTAG; col++) {
234 c->reqs[row][col].status = REQ_STATUS_IDLE;
235 c->reqs[row][col].tc = NULL;
236 }
237 c->max_tag += P9_ROW_MAXTAG;
238 }
239 spin_unlock_irqrestore(&c->lock, flags);
240 }
241 row = tag / P9_ROW_MAXTAG;
242 col = tag % P9_ROW_MAXTAG;
243
244 req = &c->reqs[row][col];
245 if (!req->tc) {
246 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
247 if (!req->wq) {
248 pr_err("Couldn't grow tag array\n");
249 return ERR_PTR(-ENOMEM);
250 }
251 init_waitqueue_head(req->wq);
252 req->tc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
253 GFP_NOFS);
254 req->rc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
255 GFP_NOFS);
256 if ((!req->tc) || (!req->rc)) {
257 pr_err("Couldn't grow tag array\n");
258 kfree(req->tc);
259 kfree(req->rc);
260 kfree(req->wq);
261 req->tc = req->rc = NULL;
262 req->wq = NULL;
263 return ERR_PTR(-ENOMEM);
264 }
265 req->tc->capacity = alloc_msize;
266 req->rc->capacity = alloc_msize;
267 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
268 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
269 }
270
271 p9pdu_reset(req->tc);
272 p9pdu_reset(req->rc);
273
274 req->tc->tag = tag-1;
275 req->status = REQ_STATUS_ALLOC;
276
277 return &c->reqs[row][col];
278 }
279
280 /**
281 * p9_tag_lookup - lookup a request by tag
282 * @c: client session to lookup tag within
283 * @tag: numeric id for transaction
284 *
285 */
286
287 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
288 {
289 int row, col;
290
291 /* This looks up the original request by tag so we know which
292 * buffer to read the data into */
293 tag++;
294
295 if(tag >= c->max_tag)
296 return NULL;
297
298 row = tag / P9_ROW_MAXTAG;
299 col = tag % P9_ROW_MAXTAG;
300
301 return &c->reqs[row][col];
302 }
303 EXPORT_SYMBOL(p9_tag_lookup);
304
305 /**
306 * p9_tag_init - setup tags structure and contents
307 * @c: v9fs client struct
308 *
309 * This initializes the tags structure for each client instance.
310 *
311 */
312
313 static int p9_tag_init(struct p9_client *c)
314 {
315 int err = 0;
316
317 c->tagpool = p9_idpool_create();
318 if (IS_ERR(c->tagpool)) {
319 err = PTR_ERR(c->tagpool);
320 goto error;
321 }
322 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
323 if (err < 0) {
324 p9_idpool_destroy(c->tagpool);
325 goto error;
326 }
327 c->max_tag = 0;
328 error:
329 return err;
330 }
331
332 /**
333 * p9_tag_cleanup - cleans up tags structure and reclaims resources
334 * @c: v9fs client struct
335 *
336 * This frees resources associated with the tags structure
337 *
338 */
339 static void p9_tag_cleanup(struct p9_client *c)
340 {
341 int row, col;
342
343 /* check to insure all requests are idle */
344 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
345 for (col = 0; col < P9_ROW_MAXTAG; col++) {
346 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
347 p9_debug(P9_DEBUG_MUX,
348 "Attempting to cleanup non-free tag %d,%d\n",
349 row, col);
350 /* TODO: delay execution of cleanup */
351 return;
352 }
353 }
354 }
355
356 if (c->tagpool) {
357 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
358 p9_idpool_destroy(c->tagpool);
359 }
360
361 /* free requests associated with tags */
362 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
363 for (col = 0; col < P9_ROW_MAXTAG; col++) {
364 kfree(c->reqs[row][col].wq);
365 kfree(c->reqs[row][col].tc);
366 kfree(c->reqs[row][col].rc);
367 }
368 kfree(c->reqs[row]);
369 }
370 c->max_tag = 0;
371 }
372
373 /**
374 * p9_free_req - free a request and clean-up as necessary
375 * c: client state
376 * r: request to release
377 *
378 */
379
380 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
381 {
382 int tag = r->tc->tag;
383 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
384
385 r->status = REQ_STATUS_IDLE;
386 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
387 p9_idpool_put(tag, c->tagpool);
388 }
389
390 /**
391 * p9_client_cb - call back from transport to client
392 * c: client state
393 * req: request received
394 *
395 */
396 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
397 {
398 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
399 wake_up(req->wq);
400 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
401 }
402 EXPORT_SYMBOL(p9_client_cb);
403
404 /**
405 * p9_parse_header - parse header arguments out of a packet
406 * @pdu: packet to parse
407 * @size: size of packet
408 * @type: type of request
409 * @tag: tag of packet
410 * @rewind: set if we need to rewind offset afterwards
411 */
412
413 int
414 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
415 int rewind)
416 {
417 int8_t r_type;
418 int16_t r_tag;
419 int32_t r_size;
420 int offset = pdu->offset;
421 int err;
422
423 pdu->offset = 0;
424 if (pdu->size == 0)
425 pdu->size = 7;
426
427 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
428 if (err)
429 goto rewind_and_exit;
430
431 pdu->size = r_size;
432 pdu->id = r_type;
433 pdu->tag = r_tag;
434
435 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
436 pdu->size, pdu->id, pdu->tag);
437
438 if (type)
439 *type = r_type;
440 if (tag)
441 *tag = r_tag;
442 if (size)
443 *size = r_size;
444
445
446 rewind_and_exit:
447 if (rewind)
448 pdu->offset = offset;
449 return err;
450 }
451 EXPORT_SYMBOL(p9_parse_header);
452
453 /**
454 * p9_check_errors - check 9p packet for error return and process it
455 * @c: current client instance
456 * @req: request to parse and check for error conditions
457 *
458 * returns error code if one is discovered, otherwise returns 0
459 *
460 * this will have to be more complicated if we have multiple
461 * error packet types
462 */
463
464 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
465 {
466 int8_t type;
467 int err;
468 int ecode;
469
470 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
471 /*
472 * dump the response from server
473 * This should be after check errors which poplulate pdu_fcall.
474 */
475 trace_9p_protocol_dump(c, req->rc);
476 if (err) {
477 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
478 return err;
479 }
480 if (type != P9_RERROR && type != P9_RLERROR)
481 return 0;
482
483 if (!p9_is_proto_dotl(c)) {
484 char *ename;
485 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
486 &ename, &ecode);
487 if (err)
488 goto out_err;
489
490 if (p9_is_proto_dotu(c))
491 err = -ecode;
492
493 if (!err || !IS_ERR_VALUE(err)) {
494 err = p9_errstr2errno(ename, strlen(ename));
495
496 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
497 -ecode, ename);
498 }
499 kfree(ename);
500 } else {
501 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
502 err = -ecode;
503
504 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
505 }
506
507 return err;
508
509 out_err:
510 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
511
512 return err;
513 }
514
515 /**
516 * p9_check_zc_errors - check 9p packet for error return and process it
517 * @c: current client instance
518 * @req: request to parse and check for error conditions
519 * @in_hdrlen: Size of response protocol buffer.
520 *
521 * returns error code if one is discovered, otherwise returns 0
522 *
523 * this will have to be more complicated if we have multiple
524 * error packet types
525 */
526
527 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
528 char *uidata, int in_hdrlen, int kern_buf)
529 {
530 int err;
531 int ecode;
532 int8_t type;
533 char *ename = NULL;
534
535 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
536 /*
537 * dump the response from server
538 * This should be after parse_header which poplulate pdu_fcall.
539 */
540 trace_9p_protocol_dump(c, req->rc);
541 if (err) {
542 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
543 return err;
544 }
545
546 if (type != P9_RERROR && type != P9_RLERROR)
547 return 0;
548
549 if (!p9_is_proto_dotl(c)) {
550 /* Error is reported in string format */
551 uint16_t len;
552 /* 7 = header size for RERROR, 2 is the size of string len; */
553 int inline_len = in_hdrlen - (7 + 2);
554
555 /* Read the size of error string */
556 err = p9pdu_readf(req->rc, c->proto_version, "w", &len);
557 if (err)
558 goto out_err;
559
560 ename = kmalloc(len + 1, GFP_NOFS);
561 if (!ename) {
562 err = -ENOMEM;
563 goto out_err;
564 }
565 if (len <= inline_len) {
566 /* We have error in protocol buffer itself */
567 if (pdu_read(req->rc, ename, len)) {
568 err = -EFAULT;
569 goto out_free;
570
571 }
572 } else {
573 /*
574 * Part of the data is in user space buffer.
575 */
576 if (pdu_read(req->rc, ename, inline_len)) {
577 err = -EFAULT;
578 goto out_free;
579
580 }
581 if (kern_buf) {
582 memcpy(ename + inline_len, uidata,
583 len - inline_len);
584 } else {
585 err = copy_from_user(ename + inline_len,
586 uidata, len - inline_len);
587 if (err) {
588 err = -EFAULT;
589 goto out_free;
590 }
591 }
592 }
593 ename[len] = 0;
594 if (p9_is_proto_dotu(c)) {
595 /* For dotu we also have error code */
596 err = p9pdu_readf(req->rc,
597 c->proto_version, "d", &ecode);
598 if (err)
599 goto out_free;
600 err = -ecode;
601 }
602 if (!err || !IS_ERR_VALUE(err)) {
603 err = p9_errstr2errno(ename, strlen(ename));
604
605 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
606 -ecode, ename);
607 }
608 kfree(ename);
609 } else {
610 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
611 err = -ecode;
612
613 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
614 }
615 return err;
616
617 out_free:
618 kfree(ename);
619 out_err:
620 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
621 return err;
622 }
623
624 static struct p9_req_t *
625 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
626
627 /**
628 * p9_client_flush - flush (cancel) a request
629 * @c: client state
630 * @oldreq: request to cancel
631 *
632 * This sents a flush for a particular request and links
633 * the flush request to the original request. The current
634 * code only supports a single flush request although the protocol
635 * allows for multiple flush requests to be sent for a single request.
636 *
637 */
638
639 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
640 {
641 struct p9_req_t *req;
642 int16_t oldtag;
643 int err;
644
645 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
646 if (err)
647 return err;
648
649 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
650
651 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
652 if (IS_ERR(req))
653 return PTR_ERR(req);
654
655
656 /* if we haven't received a response for oldreq,
657 remove it from the list. */
658 spin_lock(&c->lock);
659 if (oldreq->status == REQ_STATUS_FLSH)
660 list_del(&oldreq->req_list);
661 spin_unlock(&c->lock);
662
663 p9_free_req(c, req);
664 return 0;
665 }
666
667 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
668 int8_t type, int req_size,
669 const char *fmt, va_list ap)
670 {
671 int tag, err;
672 struct p9_req_t *req;
673
674 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
675
676 /* we allow for any status other than disconnected */
677 if (c->status == Disconnected)
678 return ERR_PTR(-EIO);
679
680 /* if status is begin_disconnected we allow only clunk request */
681 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
682 return ERR_PTR(-EIO);
683
684 tag = P9_NOTAG;
685 if (type != P9_TVERSION) {
686 tag = p9_idpool_get(c->tagpool);
687 if (tag < 0)
688 return ERR_PTR(-ENOMEM);
689 }
690
691 req = p9_tag_alloc(c, tag, req_size);
692 if (IS_ERR(req))
693 return req;
694
695 /* marshall the data */
696 p9pdu_prepare(req->tc, tag, type);
697 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
698 if (err)
699 goto reterr;
700 p9pdu_finalize(c, req->tc);
701 trace_9p_client_req(c, type, tag);
702 return req;
703 reterr:
704 p9_free_req(c, req);
705 return ERR_PTR(err);
706 }
707
708 /**
709 * p9_client_rpc - issue a request and wait for a response
710 * @c: client session
711 * @type: type of request
712 * @fmt: protocol format string (see protocol.c)
713 *
714 * Returns request structure (which client must free using p9_free_req)
715 */
716
717 static struct p9_req_t *
718 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
719 {
720 va_list ap;
721 int sigpending, err;
722 unsigned long flags;
723 struct p9_req_t *req;
724
725 va_start(ap, fmt);
726 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
727 va_end(ap);
728 if (IS_ERR(req))
729 return req;
730
731 if (signal_pending(current)) {
732 sigpending = 1;
733 clear_thread_flag(TIF_SIGPENDING);
734 } else
735 sigpending = 0;
736
737 err = c->trans_mod->request(c, req);
738 if (err < 0) {
739 if (err != -ERESTARTSYS && err != -EFAULT)
740 c->status = Disconnected;
741 goto reterr;
742 }
743 /* Wait for the response */
744 err = wait_event_interruptible(*req->wq,
745 req->status >= REQ_STATUS_RCVD);
746
747 if (req->status == REQ_STATUS_ERROR) {
748 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
749 err = req->t_err;
750 }
751 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
752 p9_debug(P9_DEBUG_MUX, "flushing\n");
753 sigpending = 1;
754 clear_thread_flag(TIF_SIGPENDING);
755
756 if (c->trans_mod->cancel(c, req))
757 p9_client_flush(c, req);
758
759 /* if we received the response anyway, don't signal error */
760 if (req->status == REQ_STATUS_RCVD)
761 err = 0;
762 }
763 if (sigpending) {
764 spin_lock_irqsave(&current->sighand->siglock, flags);
765 recalc_sigpending();
766 spin_unlock_irqrestore(&current->sighand->siglock, flags);
767 }
768 if (err < 0)
769 goto reterr;
770
771 err = p9_check_errors(c, req);
772 trace_9p_client_res(c, type, req->rc->tag, err);
773 if (!err)
774 return req;
775 reterr:
776 p9_free_req(c, req);
777 return ERR_PTR(err);
778 }
779
780 /**
781 * p9_client_zc_rpc - issue a request and wait for a response
782 * @c: client session
783 * @type: type of request
784 * @uidata: user bffer that should be ued for zero copy read
785 * @uodata: user buffer that shoud be user for zero copy write
786 * @inlen: read buffer size
787 * @olen: write buffer size
788 * @hdrlen: reader header size, This is the size of response protocol data
789 * @fmt: protocol format string (see protocol.c)
790 *
791 * Returns request structure (which client must free using p9_free_req)
792 */
793 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
794 char *uidata, char *uodata,
795 int inlen, int olen, int in_hdrlen,
796 int kern_buf, const char *fmt, ...)
797 {
798 va_list ap;
799 int sigpending, err;
800 unsigned long flags;
801 struct p9_req_t *req;
802
803 va_start(ap, fmt);
804 /*
805 * We allocate a inline protocol data of only 4k bytes.
806 * The actual content is passed in zero-copy fashion.
807 */
808 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
809 va_end(ap);
810 if (IS_ERR(req))
811 return req;
812
813 if (signal_pending(current)) {
814 sigpending = 1;
815 clear_thread_flag(TIF_SIGPENDING);
816 } else
817 sigpending = 0;
818
819 /* If we are called with KERNEL_DS force kern_buf */
820 if (segment_eq(get_fs(), KERNEL_DS))
821 kern_buf = 1;
822
823 err = c->trans_mod->zc_request(c, req, uidata, uodata,
824 inlen, olen, in_hdrlen, kern_buf);
825 if (err < 0) {
826 if (err == -EIO)
827 c->status = Disconnected;
828 goto reterr;
829 }
830 if (req->status == REQ_STATUS_ERROR) {
831 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
832 err = req->t_err;
833 }
834 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
835 p9_debug(P9_DEBUG_MUX, "flushing\n");
836 sigpending = 1;
837 clear_thread_flag(TIF_SIGPENDING);
838
839 if (c->trans_mod->cancel(c, req))
840 p9_client_flush(c, req);
841
842 /* if we received the response anyway, don't signal error */
843 if (req->status == REQ_STATUS_RCVD)
844 err = 0;
845 }
846 if (sigpending) {
847 spin_lock_irqsave(&current->sighand->siglock, flags);
848 recalc_sigpending();
849 spin_unlock_irqrestore(&current->sighand->siglock, flags);
850 }
851 if (err < 0)
852 goto reterr;
853
854 err = p9_check_zc_errors(c, req, uidata, in_hdrlen, kern_buf);
855 trace_9p_client_res(c, type, req->rc->tag, err);
856 if (!err)
857 return req;
858 reterr:
859 p9_free_req(c, req);
860 return ERR_PTR(err);
861 }
862
863 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
864 {
865 int ret;
866 struct p9_fid *fid;
867 unsigned long flags;
868
869 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
870 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
871 if (!fid)
872 return ERR_PTR(-ENOMEM);
873
874 ret = p9_idpool_get(clnt->fidpool);
875 if (ret < 0) {
876 ret = -ENOSPC;
877 goto error;
878 }
879 fid->fid = ret;
880
881 memset(&fid->qid, 0, sizeof(struct p9_qid));
882 fid->mode = -1;
883 fid->uid = current_fsuid();
884 fid->clnt = clnt;
885 fid->rdir = NULL;
886 spin_lock_irqsave(&clnt->lock, flags);
887 list_add(&fid->flist, &clnt->fidlist);
888 spin_unlock_irqrestore(&clnt->lock, flags);
889
890 return fid;
891
892 error:
893 kfree(fid);
894 return ERR_PTR(ret);
895 }
896
897 static void p9_fid_destroy(struct p9_fid *fid)
898 {
899 struct p9_client *clnt;
900 unsigned long flags;
901
902 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
903 clnt = fid->clnt;
904 p9_idpool_put(fid->fid, clnt->fidpool);
905 spin_lock_irqsave(&clnt->lock, flags);
906 list_del(&fid->flist);
907 spin_unlock_irqrestore(&clnt->lock, flags);
908 kfree(fid->rdir);
909 kfree(fid);
910 }
911
912 static int p9_client_version(struct p9_client *c)
913 {
914 int err = 0;
915 struct p9_req_t *req;
916 char *version;
917 int msize;
918
919 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
920 c->msize, c->proto_version);
921
922 switch (c->proto_version) {
923 case p9_proto_2000L:
924 req = p9_client_rpc(c, P9_TVERSION, "ds",
925 c->msize, "9P2000.L");
926 break;
927 case p9_proto_2000u:
928 req = p9_client_rpc(c, P9_TVERSION, "ds",
929 c->msize, "9P2000.u");
930 break;
931 case p9_proto_legacy:
932 req = p9_client_rpc(c, P9_TVERSION, "ds",
933 c->msize, "9P2000");
934 break;
935 default:
936 return -EINVAL;
937 break;
938 }
939
940 if (IS_ERR(req))
941 return PTR_ERR(req);
942
943 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
944 if (err) {
945 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
946 trace_9p_protocol_dump(c, req->rc);
947 goto error;
948 }
949
950 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
951 if (!strncmp(version, "9P2000.L", 8))
952 c->proto_version = p9_proto_2000L;
953 else if (!strncmp(version, "9P2000.u", 8))
954 c->proto_version = p9_proto_2000u;
955 else if (!strncmp(version, "9P2000", 6))
956 c->proto_version = p9_proto_legacy;
957 else {
958 err = -EREMOTEIO;
959 goto error;
960 }
961
962 if (msize < c->msize)
963 c->msize = msize;
964
965 error:
966 kfree(version);
967 p9_free_req(c, req);
968
969 return err;
970 }
971
972 struct p9_client *p9_client_create(const char *dev_name, char *options)
973 {
974 int err;
975 struct p9_client *clnt;
976
977 err = 0;
978 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
979 if (!clnt)
980 return ERR_PTR(-ENOMEM);
981
982 clnt->trans_mod = NULL;
983 clnt->trans = NULL;
984 spin_lock_init(&clnt->lock);
985 INIT_LIST_HEAD(&clnt->fidlist);
986
987 err = p9_tag_init(clnt);
988 if (err < 0)
989 goto free_client;
990
991 err = parse_opts(options, clnt);
992 if (err < 0)
993 goto destroy_tagpool;
994
995 if (!clnt->trans_mod)
996 clnt->trans_mod = v9fs_get_default_trans();
997
998 if (clnt->trans_mod == NULL) {
999 err = -EPROTONOSUPPORT;
1000 p9_debug(P9_DEBUG_ERROR,
1001 "No transport defined or default transport\n");
1002 goto destroy_tagpool;
1003 }
1004
1005 clnt->fidpool = p9_idpool_create();
1006 if (IS_ERR(clnt->fidpool)) {
1007 err = PTR_ERR(clnt->fidpool);
1008 goto put_trans;
1009 }
1010
1011 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1012 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1013
1014 err = clnt->trans_mod->create(clnt, dev_name, options);
1015 if (err)
1016 goto destroy_fidpool;
1017
1018 if (clnt->msize > clnt->trans_mod->maxsize)
1019 clnt->msize = clnt->trans_mod->maxsize;
1020
1021 err = p9_client_version(clnt);
1022 if (err)
1023 goto close_trans;
1024
1025 return clnt;
1026
1027 close_trans:
1028 clnt->trans_mod->close(clnt);
1029 destroy_fidpool:
1030 p9_idpool_destroy(clnt->fidpool);
1031 put_trans:
1032 v9fs_put_trans(clnt->trans_mod);
1033 destroy_tagpool:
1034 p9_idpool_destroy(clnt->tagpool);
1035 free_client:
1036 kfree(clnt);
1037 return ERR_PTR(err);
1038 }
1039 EXPORT_SYMBOL(p9_client_create);
1040
1041 void p9_client_destroy(struct p9_client *clnt)
1042 {
1043 struct p9_fid *fid, *fidptr;
1044
1045 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1046
1047 if (clnt->trans_mod)
1048 clnt->trans_mod->close(clnt);
1049
1050 v9fs_put_trans(clnt->trans_mod);
1051
1052 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
1053 pr_info("Found fid %d not clunked\n", fid->fid);
1054 p9_fid_destroy(fid);
1055 }
1056
1057 if (clnt->fidpool)
1058 p9_idpool_destroy(clnt->fidpool);
1059
1060 p9_tag_cleanup(clnt);
1061
1062 kfree(clnt);
1063 }
1064 EXPORT_SYMBOL(p9_client_destroy);
1065
1066 void p9_client_disconnect(struct p9_client *clnt)
1067 {
1068 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1069 clnt->status = Disconnected;
1070 }
1071 EXPORT_SYMBOL(p9_client_disconnect);
1072
1073 void p9_client_begin_disconnect(struct p9_client *clnt)
1074 {
1075 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1076 clnt->status = BeginDisconnect;
1077 }
1078 EXPORT_SYMBOL(p9_client_begin_disconnect);
1079
1080 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1081 char *uname, u32 n_uname, char *aname)
1082 {
1083 int err = 0;
1084 struct p9_req_t *req;
1085 struct p9_fid *fid;
1086 struct p9_qid qid;
1087
1088
1089 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1090 afid ? afid->fid : -1, uname, aname);
1091 fid = p9_fid_create(clnt);
1092 if (IS_ERR(fid)) {
1093 err = PTR_ERR(fid);
1094 fid = NULL;
1095 goto error;
1096 }
1097
1098 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
1099 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1100 if (IS_ERR(req)) {
1101 err = PTR_ERR(req);
1102 goto error;
1103 }
1104
1105 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
1106 if (err) {
1107 trace_9p_protocol_dump(clnt, req->rc);
1108 p9_free_req(clnt, req);
1109 goto error;
1110 }
1111
1112 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1113 qid.type, (unsigned long long)qid.path, qid.version);
1114
1115 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1116
1117 p9_free_req(clnt, req);
1118 return fid;
1119
1120 error:
1121 if (fid)
1122 p9_fid_destroy(fid);
1123 return ERR_PTR(err);
1124 }
1125 EXPORT_SYMBOL(p9_client_attach);
1126
1127 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1128 char **wnames, int clone)
1129 {
1130 int err;
1131 struct p9_client *clnt;
1132 struct p9_fid *fid;
1133 struct p9_qid *wqids;
1134 struct p9_req_t *req;
1135 uint16_t nwqids, count;
1136
1137 err = 0;
1138 wqids = NULL;
1139 clnt = oldfid->clnt;
1140 if (clone) {
1141 fid = p9_fid_create(clnt);
1142 if (IS_ERR(fid)) {
1143 err = PTR_ERR(fid);
1144 fid = NULL;
1145 goto error;
1146 }
1147
1148 fid->uid = oldfid->uid;
1149 } else
1150 fid = oldfid;
1151
1152
1153 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1154 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1155
1156 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1157 nwname, wnames);
1158 if (IS_ERR(req)) {
1159 err = PTR_ERR(req);
1160 goto error;
1161 }
1162
1163 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1164 if (err) {
1165 trace_9p_protocol_dump(clnt, req->rc);
1166 p9_free_req(clnt, req);
1167 goto clunk_fid;
1168 }
1169 p9_free_req(clnt, req);
1170
1171 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1172
1173 if (nwqids != nwname) {
1174 err = -ENOENT;
1175 goto clunk_fid;
1176 }
1177
1178 for (count = 0; count < nwqids; count++)
1179 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1180 count, wqids[count].type,
1181 (unsigned long long)wqids[count].path,
1182 wqids[count].version);
1183
1184 if (nwname)
1185 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1186 else
1187 fid->qid = oldfid->qid;
1188
1189 kfree(wqids);
1190 return fid;
1191
1192 clunk_fid:
1193 kfree(wqids);
1194 p9_client_clunk(fid);
1195 fid = NULL;
1196
1197 error:
1198 if (fid && (fid != oldfid))
1199 p9_fid_destroy(fid);
1200
1201 return ERR_PTR(err);
1202 }
1203 EXPORT_SYMBOL(p9_client_walk);
1204
1205 int p9_client_open(struct p9_fid *fid, int mode)
1206 {
1207 int err;
1208 struct p9_client *clnt;
1209 struct p9_req_t *req;
1210 struct p9_qid qid;
1211 int iounit;
1212
1213 clnt = fid->clnt;
1214 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1215 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1216 err = 0;
1217
1218 if (fid->mode != -1)
1219 return -EINVAL;
1220
1221 if (p9_is_proto_dotl(clnt))
1222 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1223 else
1224 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1225 if (IS_ERR(req)) {
1226 err = PTR_ERR(req);
1227 goto error;
1228 }
1229
1230 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1231 if (err) {
1232 trace_9p_protocol_dump(clnt, req->rc);
1233 goto free_and_error;
1234 }
1235
1236 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1237 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1238 (unsigned long long)qid.path, qid.version, iounit);
1239
1240 fid->mode = mode;
1241 fid->iounit = iounit;
1242
1243 free_and_error:
1244 p9_free_req(clnt, req);
1245 error:
1246 return err;
1247 }
1248 EXPORT_SYMBOL(p9_client_open);
1249
1250 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1251 gid_t gid, struct p9_qid *qid)
1252 {
1253 int err = 0;
1254 struct p9_client *clnt;
1255 struct p9_req_t *req;
1256 int iounit;
1257
1258 p9_debug(P9_DEBUG_9P,
1259 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1260 ofid->fid, name, flags, mode, gid);
1261 clnt = ofid->clnt;
1262
1263 if (ofid->mode != -1)
1264 return -EINVAL;
1265
1266 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags,
1267 mode, gid);
1268 if (IS_ERR(req)) {
1269 err = PTR_ERR(req);
1270 goto error;
1271 }
1272
1273 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1274 if (err) {
1275 trace_9p_protocol_dump(clnt, req->rc);
1276 goto free_and_error;
1277 }
1278
1279 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1280 qid->type,
1281 (unsigned long long)qid->path,
1282 qid->version, iounit);
1283
1284 ofid->mode = mode;
1285 ofid->iounit = iounit;
1286
1287 free_and_error:
1288 p9_free_req(clnt, req);
1289 error:
1290 return err;
1291 }
1292 EXPORT_SYMBOL(p9_client_create_dotl);
1293
1294 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1295 char *extension)
1296 {
1297 int err;
1298 struct p9_client *clnt;
1299 struct p9_req_t *req;
1300 struct p9_qid qid;
1301 int iounit;
1302
1303 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1304 fid->fid, name, perm, mode);
1305 err = 0;
1306 clnt = fid->clnt;
1307
1308 if (fid->mode != -1)
1309 return -EINVAL;
1310
1311 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1312 mode, extension);
1313 if (IS_ERR(req)) {
1314 err = PTR_ERR(req);
1315 goto error;
1316 }
1317
1318 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1319 if (err) {
1320 trace_9p_protocol_dump(clnt, req->rc);
1321 goto free_and_error;
1322 }
1323
1324 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1325 qid.type,
1326 (unsigned long long)qid.path,
1327 qid.version, iounit);
1328
1329 fid->mode = mode;
1330 fid->iounit = iounit;
1331
1332 free_and_error:
1333 p9_free_req(clnt, req);
1334 error:
1335 return err;
1336 }
1337 EXPORT_SYMBOL(p9_client_fcreate);
1338
1339 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid,
1340 struct p9_qid *qid)
1341 {
1342 int err = 0;
1343 struct p9_client *clnt;
1344 struct p9_req_t *req;
1345
1346 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1347 dfid->fid, name, symtgt);
1348 clnt = dfid->clnt;
1349
1350 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt,
1351 gid);
1352 if (IS_ERR(req)) {
1353 err = PTR_ERR(req);
1354 goto error;
1355 }
1356
1357 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1358 if (err) {
1359 trace_9p_protocol_dump(clnt, req->rc);
1360 goto free_and_error;
1361 }
1362
1363 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1364 qid->type, (unsigned long long)qid->path, qid->version);
1365
1366 free_and_error:
1367 p9_free_req(clnt, req);
1368 error:
1369 return err;
1370 }
1371 EXPORT_SYMBOL(p9_client_symlink);
1372
1373 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1374 {
1375 struct p9_client *clnt;
1376 struct p9_req_t *req;
1377
1378 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1379 dfid->fid, oldfid->fid, newname);
1380 clnt = dfid->clnt;
1381 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1382 newname);
1383 if (IS_ERR(req))
1384 return PTR_ERR(req);
1385
1386 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1387 p9_free_req(clnt, req);
1388 return 0;
1389 }
1390 EXPORT_SYMBOL(p9_client_link);
1391
1392 int p9_client_fsync(struct p9_fid *fid, int datasync)
1393 {
1394 int err;
1395 struct p9_client *clnt;
1396 struct p9_req_t *req;
1397
1398 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1399 fid->fid, datasync);
1400 err = 0;
1401 clnt = fid->clnt;
1402
1403 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1404 if (IS_ERR(req)) {
1405 err = PTR_ERR(req);
1406 goto error;
1407 }
1408
1409 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1410
1411 p9_free_req(clnt, req);
1412
1413 error:
1414 return err;
1415 }
1416 EXPORT_SYMBOL(p9_client_fsync);
1417
1418 int p9_client_clunk(struct p9_fid *fid)
1419 {
1420 int err;
1421 struct p9_client *clnt;
1422 struct p9_req_t *req;
1423
1424 if (!fid) {
1425 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1426 __func__, task_pid_nr(current));
1427 dump_stack();
1428 return 0;
1429 }
1430
1431 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
1432 err = 0;
1433 clnt = fid->clnt;
1434
1435 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1436 if (IS_ERR(req)) {
1437 err = PTR_ERR(req);
1438 goto error;
1439 }
1440
1441 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1442
1443 p9_free_req(clnt, req);
1444 error:
1445 /*
1446 * Fid is not valid even after a failed clunk
1447 */
1448 p9_fid_destroy(fid);
1449 return err;
1450 }
1451 EXPORT_SYMBOL(p9_client_clunk);
1452
1453 int p9_client_remove(struct p9_fid *fid)
1454 {
1455 int err;
1456 struct p9_client *clnt;
1457 struct p9_req_t *req;
1458
1459 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1460 err = 0;
1461 clnt = fid->clnt;
1462
1463 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1464 if (IS_ERR(req)) {
1465 err = PTR_ERR(req);
1466 goto error;
1467 }
1468
1469 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1470
1471 p9_free_req(clnt, req);
1472 error:
1473 p9_fid_destroy(fid);
1474 return err;
1475 }
1476 EXPORT_SYMBOL(p9_client_remove);
1477
1478 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1479 {
1480 int err = 0;
1481 struct p9_req_t *req;
1482 struct p9_client *clnt;
1483
1484 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1485 dfid->fid, name, flags);
1486
1487 clnt = dfid->clnt;
1488 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1489 if (IS_ERR(req)) {
1490 err = PTR_ERR(req);
1491 goto error;
1492 }
1493 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1494
1495 p9_free_req(clnt, req);
1496 error:
1497 return err;
1498 }
1499 EXPORT_SYMBOL(p9_client_unlinkat);
1500
1501 int
1502 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1503 u32 count)
1504 {
1505 char *dataptr;
1506 int kernel_buf = 0;
1507 struct p9_req_t *req;
1508 struct p9_client *clnt;
1509 int err, rsize, non_zc = 0;
1510
1511
1512 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1513 fid->fid, (long long unsigned) offset, count);
1514 err = 0;
1515 clnt = fid->clnt;
1516
1517 rsize = fid->iounit;
1518 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1519 rsize = clnt->msize - P9_IOHDRSZ;
1520
1521 if (count < rsize)
1522 rsize = count;
1523
1524 /* Don't bother zerocopy for small IO (< 1024) */
1525 if (clnt->trans_mod->zc_request && rsize > 1024) {
1526 char *indata;
1527 if (data) {
1528 kernel_buf = 1;
1529 indata = data;
1530 } else
1531 indata = (char *)udata;
1532 /*
1533 * response header len is 11
1534 * PDU Header(7) + IO Size (4)
1535 */
1536 req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0,
1537 11, kernel_buf, "dqd", fid->fid,
1538 offset, rsize);
1539 } else {
1540 non_zc = 1;
1541 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1542 rsize);
1543 }
1544 if (IS_ERR(req)) {
1545 err = PTR_ERR(req);
1546 goto error;
1547 }
1548
1549 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1550 if (err) {
1551 trace_9p_protocol_dump(clnt, req->rc);
1552 goto free_and_error;
1553 }
1554
1555 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1556
1557 if (non_zc) {
1558 if (data) {
1559 memmove(data, dataptr, count);
1560 } else {
1561 err = copy_to_user(udata, dataptr, count);
1562 if (err) {
1563 err = -EFAULT;
1564 goto free_and_error;
1565 }
1566 }
1567 }
1568 p9_free_req(clnt, req);
1569 return count;
1570
1571 free_and_error:
1572 p9_free_req(clnt, req);
1573 error:
1574 return err;
1575 }
1576 EXPORT_SYMBOL(p9_client_read);
1577
1578 int
1579 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1580 u64 offset, u32 count)
1581 {
1582 int err, rsize;
1583 int kernel_buf = 0;
1584 struct p9_client *clnt;
1585 struct p9_req_t *req;
1586
1587 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1588 fid->fid, (long long unsigned) offset, count);
1589 err = 0;
1590 clnt = fid->clnt;
1591
1592 rsize = fid->iounit;
1593 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1594 rsize = clnt->msize - P9_IOHDRSZ;
1595
1596 if (count < rsize)
1597 rsize = count;
1598
1599 /* Don't bother zerocopy for small IO (< 1024) */
1600 if (clnt->trans_mod->zc_request && rsize > 1024) {
1601 char *odata;
1602 if (data) {
1603 kernel_buf = 1;
1604 odata = data;
1605 } else
1606 odata = (char *)udata;
1607 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize,
1608 P9_ZC_HDR_SZ, kernel_buf, "dqd",
1609 fid->fid, offset, rsize);
1610 } else {
1611 if (data)
1612 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
1613 offset, rsize, data);
1614 else
1615 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
1616 offset, rsize, udata);
1617 }
1618 if (IS_ERR(req)) {
1619 err = PTR_ERR(req);
1620 goto error;
1621 }
1622
1623 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1624 if (err) {
1625 trace_9p_protocol_dump(clnt, req->rc);
1626 goto free_and_error;
1627 }
1628
1629 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1630
1631 p9_free_req(clnt, req);
1632 return count;
1633
1634 free_and_error:
1635 p9_free_req(clnt, req);
1636 error:
1637 return err;
1638 }
1639 EXPORT_SYMBOL(p9_client_write);
1640
1641 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1642 {
1643 int err;
1644 struct p9_client *clnt;
1645 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1646 struct p9_req_t *req;
1647 u16 ignored;
1648
1649 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1650
1651 if (!ret)
1652 return ERR_PTR(-ENOMEM);
1653
1654 err = 0;
1655 clnt = fid->clnt;
1656
1657 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1658 if (IS_ERR(req)) {
1659 err = PTR_ERR(req);
1660 goto error;
1661 }
1662
1663 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1664 if (err) {
1665 trace_9p_protocol_dump(clnt, req->rc);
1666 p9_free_req(clnt, req);
1667 goto error;
1668 }
1669
1670 p9_debug(P9_DEBUG_9P,
1671 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1672 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1673 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1674 "<<< uid=%d gid=%d n_muid=%d\n",
1675 ret->size, ret->type, ret->dev, ret->qid.type,
1676 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1677 ret->atime, ret->mtime, (unsigned long long)ret->length,
1678 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1679 ret->n_uid, ret->n_gid, ret->n_muid);
1680
1681 p9_free_req(clnt, req);
1682 return ret;
1683
1684 error:
1685 kfree(ret);
1686 return ERR_PTR(err);
1687 }
1688 EXPORT_SYMBOL(p9_client_stat);
1689
1690 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1691 u64 request_mask)
1692 {
1693 int err;
1694 struct p9_client *clnt;
1695 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1696 GFP_KERNEL);
1697 struct p9_req_t *req;
1698
1699 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1700 fid->fid, request_mask);
1701
1702 if (!ret)
1703 return ERR_PTR(-ENOMEM);
1704
1705 err = 0;
1706 clnt = fid->clnt;
1707
1708 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1709 if (IS_ERR(req)) {
1710 err = PTR_ERR(req);
1711 goto error;
1712 }
1713
1714 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1715 if (err) {
1716 trace_9p_protocol_dump(clnt, req->rc);
1717 p9_free_req(clnt, req);
1718 goto error;
1719 }
1720
1721 p9_debug(P9_DEBUG_9P,
1722 "<<< RGETATTR st_result_mask=%lld\n"
1723 "<<< qid=%x.%llx.%x\n"
1724 "<<< st_mode=%8.8x st_nlink=%llu\n"
1725 "<<< st_uid=%d st_gid=%d\n"
1726 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1727 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1728 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1729 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1730 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1731 "<<< st_gen=%lld st_data_version=%lld",
1732 ret->st_result_mask, ret->qid.type, ret->qid.path,
1733 ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid,
1734 ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize,
1735 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1736 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1737 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1738 ret->st_gen, ret->st_data_version);
1739
1740 p9_free_req(clnt, req);
1741 return ret;
1742
1743 error:
1744 kfree(ret);
1745 return ERR_PTR(err);
1746 }
1747 EXPORT_SYMBOL(p9_client_getattr_dotl);
1748
1749 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1750 {
1751 int ret;
1752
1753 /* NOTE: size shouldn't include its own length */
1754 /* size[2] type[2] dev[4] qid[13] */
1755 /* mode[4] atime[4] mtime[4] length[8]*/
1756 /* name[s] uid[s] gid[s] muid[s] */
1757 ret = 2+4+13+4+4+4+8+2+2+2+2;
1758
1759 if (wst->name)
1760 ret += strlen(wst->name);
1761 if (wst->uid)
1762 ret += strlen(wst->uid);
1763 if (wst->gid)
1764 ret += strlen(wst->gid);
1765 if (wst->muid)
1766 ret += strlen(wst->muid);
1767
1768 if ((proto_version == p9_proto_2000u) ||
1769 (proto_version == p9_proto_2000L)) {
1770 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1771 if (wst->extension)
1772 ret += strlen(wst->extension);
1773 }
1774
1775 return ret;
1776 }
1777
1778 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1779 {
1780 int err;
1781 struct p9_req_t *req;
1782 struct p9_client *clnt;
1783
1784 err = 0;
1785 clnt = fid->clnt;
1786 wst->size = p9_client_statsize(wst, clnt->proto_version);
1787 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1788 p9_debug(P9_DEBUG_9P,
1789 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1790 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1791 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1792 " uid=%d gid=%d n_muid=%d\n",
1793 wst->size, wst->type, wst->dev, wst->qid.type,
1794 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1795 wst->atime, wst->mtime, (unsigned long long)wst->length,
1796 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1797 wst->n_uid, wst->n_gid, wst->n_muid);
1798
1799 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1800 if (IS_ERR(req)) {
1801 err = PTR_ERR(req);
1802 goto error;
1803 }
1804
1805 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1806
1807 p9_free_req(clnt, req);
1808 error:
1809 return err;
1810 }
1811 EXPORT_SYMBOL(p9_client_wstat);
1812
1813 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1814 {
1815 int err;
1816 struct p9_req_t *req;
1817 struct p9_client *clnt;
1818
1819 err = 0;
1820 clnt = fid->clnt;
1821 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1822 p9_debug(P9_DEBUG_9P,
1823 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1824 " atime_sec=%lld atime_nsec=%lld\n"
1825 " mtime_sec=%lld mtime_nsec=%lld\n",
1826 p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid,
1827 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1828 p9attr->mtime_sec, p9attr->mtime_nsec);
1829
1830 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1831
1832 if (IS_ERR(req)) {
1833 err = PTR_ERR(req);
1834 goto error;
1835 }
1836 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1837 p9_free_req(clnt, req);
1838 error:
1839 return err;
1840 }
1841 EXPORT_SYMBOL(p9_client_setattr);
1842
1843 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1844 {
1845 int err;
1846 struct p9_req_t *req;
1847 struct p9_client *clnt;
1848
1849 err = 0;
1850 clnt = fid->clnt;
1851
1852 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1853
1854 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1855 if (IS_ERR(req)) {
1856 err = PTR_ERR(req);
1857 goto error;
1858 }
1859
1860 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1861 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1862 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1863 if (err) {
1864 trace_9p_protocol_dump(clnt, req->rc);
1865 p9_free_req(clnt, req);
1866 goto error;
1867 }
1868
1869 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1870 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1871 "fsid %llu namelen %ld\n",
1872 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1873 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1874 sb->fsid, (long int)sb->namelen);
1875
1876 p9_free_req(clnt, req);
1877 error:
1878 return err;
1879 }
1880 EXPORT_SYMBOL(p9_client_statfs);
1881
1882 int p9_client_rename(struct p9_fid *fid,
1883 struct p9_fid *newdirfid, const char *name)
1884 {
1885 int err;
1886 struct p9_req_t *req;
1887 struct p9_client *clnt;
1888
1889 err = 0;
1890 clnt = fid->clnt;
1891
1892 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1893 fid->fid, newdirfid->fid, name);
1894
1895 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1896 newdirfid->fid, name);
1897 if (IS_ERR(req)) {
1898 err = PTR_ERR(req);
1899 goto error;
1900 }
1901
1902 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1903
1904 p9_free_req(clnt, req);
1905 error:
1906 return err;
1907 }
1908 EXPORT_SYMBOL(p9_client_rename);
1909
1910 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1911 struct p9_fid *newdirfid, const char *new_name)
1912 {
1913 int err;
1914 struct p9_req_t *req;
1915 struct p9_client *clnt;
1916
1917 err = 0;
1918 clnt = olddirfid->clnt;
1919
1920 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1921 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1922 newdirfid->fid, new_name);
1923
1924 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1925 old_name, newdirfid->fid, new_name);
1926 if (IS_ERR(req)) {
1927 err = PTR_ERR(req);
1928 goto error;
1929 }
1930
1931 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1932 newdirfid->fid, new_name);
1933
1934 p9_free_req(clnt, req);
1935 error:
1936 return err;
1937 }
1938 EXPORT_SYMBOL(p9_client_renameat);
1939
1940 /*
1941 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1942 */
1943 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1944 const char *attr_name, u64 *attr_size)
1945 {
1946 int err;
1947 struct p9_req_t *req;
1948 struct p9_client *clnt;
1949 struct p9_fid *attr_fid;
1950
1951 err = 0;
1952 clnt = file_fid->clnt;
1953 attr_fid = p9_fid_create(clnt);
1954 if (IS_ERR(attr_fid)) {
1955 err = PTR_ERR(attr_fid);
1956 attr_fid = NULL;
1957 goto error;
1958 }
1959 p9_debug(P9_DEBUG_9P,
1960 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
1961 file_fid->fid, attr_fid->fid, attr_name);
1962
1963 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
1964 file_fid->fid, attr_fid->fid, attr_name);
1965 if (IS_ERR(req)) {
1966 err = PTR_ERR(req);
1967 goto error;
1968 }
1969 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
1970 if (err) {
1971 trace_9p_protocol_dump(clnt, req->rc);
1972 p9_free_req(clnt, req);
1973 goto clunk_fid;
1974 }
1975 p9_free_req(clnt, req);
1976 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
1977 attr_fid->fid, *attr_size);
1978 return attr_fid;
1979 clunk_fid:
1980 p9_client_clunk(attr_fid);
1981 attr_fid = NULL;
1982 error:
1983 if (attr_fid && (attr_fid != file_fid))
1984 p9_fid_destroy(attr_fid);
1985
1986 return ERR_PTR(err);
1987 }
1988 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
1989
1990 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
1991 u64 attr_size, int flags)
1992 {
1993 int err;
1994 struct p9_req_t *req;
1995 struct p9_client *clnt;
1996
1997 p9_debug(P9_DEBUG_9P,
1998 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
1999 fid->fid, name, (long long)attr_size, flags);
2000 err = 0;
2001 clnt = fid->clnt;
2002 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2003 fid->fid, name, attr_size, flags);
2004 if (IS_ERR(req)) {
2005 err = PTR_ERR(req);
2006 goto error;
2007 }
2008 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2009 p9_free_req(clnt, req);
2010 error:
2011 return err;
2012 }
2013 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2014
2015 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2016 {
2017 int err, rsize, non_zc = 0;
2018 struct p9_client *clnt;
2019 struct p9_req_t *req;
2020 char *dataptr;
2021
2022 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2023 fid->fid, (long long unsigned) offset, count);
2024
2025 err = 0;
2026 clnt = fid->clnt;
2027
2028 rsize = fid->iounit;
2029 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2030 rsize = clnt->msize - P9_READDIRHDRSZ;
2031
2032 if (count < rsize)
2033 rsize = count;
2034
2035 /* Don't bother zerocopy for small IO (< 1024) */
2036 if (clnt->trans_mod->zc_request && rsize > 1024) {
2037 /*
2038 * response header len is 11
2039 * PDU Header(7) + IO Size (4)
2040 */
2041 req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0,
2042 11, 1, "dqd", fid->fid, offset, rsize);
2043 } else {
2044 non_zc = 1;
2045 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2046 offset, rsize);
2047 }
2048 if (IS_ERR(req)) {
2049 err = PTR_ERR(req);
2050 goto error;
2051 }
2052
2053 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2054 if (err) {
2055 trace_9p_protocol_dump(clnt, req->rc);
2056 goto free_and_error;
2057 }
2058
2059 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2060
2061 if (non_zc)
2062 memmove(data, dataptr, count);
2063
2064 p9_free_req(clnt, req);
2065 return count;
2066
2067 free_and_error:
2068 p9_free_req(clnt, req);
2069 error:
2070 return err;
2071 }
2072 EXPORT_SYMBOL(p9_client_readdir);
2073
2074 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
2075 dev_t rdev, gid_t gid, struct p9_qid *qid)
2076 {
2077 int err;
2078 struct p9_client *clnt;
2079 struct p9_req_t *req;
2080
2081 err = 0;
2082 clnt = fid->clnt;
2083 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2084 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2085 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode,
2086 MAJOR(rdev), MINOR(rdev), gid);
2087 if (IS_ERR(req))
2088 return PTR_ERR(req);
2089
2090 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2091 if (err) {
2092 trace_9p_protocol_dump(clnt, req->rc);
2093 goto error;
2094 }
2095 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2096 (unsigned long long)qid->path, qid->version);
2097
2098 error:
2099 p9_free_req(clnt, req);
2100 return err;
2101
2102 }
2103 EXPORT_SYMBOL(p9_client_mknod_dotl);
2104
2105 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
2106 gid_t gid, struct p9_qid *qid)
2107 {
2108 int err;
2109 struct p9_client *clnt;
2110 struct p9_req_t *req;
2111
2112 err = 0;
2113 clnt = fid->clnt;
2114 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2115 fid->fid, name, mode, gid);
2116 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode,
2117 gid);
2118 if (IS_ERR(req))
2119 return PTR_ERR(req);
2120
2121 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2122 if (err) {
2123 trace_9p_protocol_dump(clnt, req->rc);
2124 goto error;
2125 }
2126 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2127 (unsigned long long)qid->path, qid->version);
2128
2129 error:
2130 p9_free_req(clnt, req);
2131 return err;
2132
2133 }
2134 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2135
2136 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2137 {
2138 int err;
2139 struct p9_client *clnt;
2140 struct p9_req_t *req;
2141
2142 err = 0;
2143 clnt = fid->clnt;
2144 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2145 "start %lld length %lld proc_id %d client_id %s\n",
2146 fid->fid, flock->type, flock->flags, flock->start,
2147 flock->length, flock->proc_id, flock->client_id);
2148
2149 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2150 flock->flags, flock->start, flock->length,
2151 flock->proc_id, flock->client_id);
2152
2153 if (IS_ERR(req))
2154 return PTR_ERR(req);
2155
2156 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2157 if (err) {
2158 trace_9p_protocol_dump(clnt, req->rc);
2159 goto error;
2160 }
2161 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2162 error:
2163 p9_free_req(clnt, req);
2164 return err;
2165
2166 }
2167 EXPORT_SYMBOL(p9_client_lock_dotl);
2168
2169 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2170 {
2171 int err;
2172 struct p9_client *clnt;
2173 struct p9_req_t *req;
2174
2175 err = 0;
2176 clnt = fid->clnt;
2177 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2178 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2179 glock->start, glock->length, glock->proc_id, glock->client_id);
2180
2181 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2182 glock->start, glock->length, glock->proc_id, glock->client_id);
2183
2184 if (IS_ERR(req))
2185 return PTR_ERR(req);
2186
2187 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2188 &glock->start, &glock->length, &glock->proc_id,
2189 &glock->client_id);
2190 if (err) {
2191 trace_9p_protocol_dump(clnt, req->rc);
2192 goto error;
2193 }
2194 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2195 "proc_id %d client_id %s\n", glock->type, glock->start,
2196 glock->length, glock->proc_id, glock->client_id);
2197 error:
2198 p9_free_req(clnt, req);
2199 return err;
2200 }
2201 EXPORT_SYMBOL(p9_client_getlock_dotl);
2202
2203 int p9_client_readlink(struct p9_fid *fid, char **target)
2204 {
2205 int err;
2206 struct p9_client *clnt;
2207 struct p9_req_t *req;
2208
2209 err = 0;
2210 clnt = fid->clnt;
2211 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2212
2213 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2214 if (IS_ERR(req))
2215 return PTR_ERR(req);
2216
2217 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2218 if (err) {
2219 trace_9p_protocol_dump(clnt, req->rc);
2220 goto error;
2221 }
2222 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2223 error:
2224 p9_free_req(clnt, req);
2225 return err;
2226 }
2227 EXPORT_SYMBOL(p9_client_readlink);
Linux with added FPC-III support