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Merge branch 'delivery/pinctrl-at91-3.8' of http://github.com/at91linux/linux-at91...
[deliverable/linux.git] / net / 9p / client.c
1 /*
2 * net/9p/clnt.c
3 *
4 * 9P Client
5 *
6 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to:
20 * Free Software Foundation
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02111-1301 USA
23 *
24 */
25
26 #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 /*
80 * Some error codes are taken directly from the server replies,
81 * make sure they are valid.
82 */
83 static int safe_errno(int err)
84 {
85 if ((err > 0) || (err < -MAX_ERRNO)) {
86 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err);
87 return -EPROTO;
88 }
89 return err;
90 }
91
92
93 /* Interpret mount option for protocol version */
94 static int get_protocol_version(char *s)
95 {
96 int version = -EINVAL;
97
98 if (!strcmp(s, "9p2000")) {
99 version = p9_proto_legacy;
100 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n");
101 } else if (!strcmp(s, "9p2000.u")) {
102 version = p9_proto_2000u;
103 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
104 } else if (!strcmp(s, "9p2000.L")) {
105 version = p9_proto_2000L;
106 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
107 } else
108 pr_info("Unknown protocol version %s\n", s);
109
110 return version;
111 }
112
113 /**
114 * parse_options - parse mount options into client structure
115 * @opts: options string passed from mount
116 * @clnt: existing v9fs client information
117 *
118 * Return 0 upon success, -ERRNO upon failure
119 */
120
121 static int parse_opts(char *opts, struct p9_client *clnt)
122 {
123 char *options, *tmp_options;
124 char *p;
125 substring_t args[MAX_OPT_ARGS];
126 int option;
127 char *s;
128 int ret = 0;
129
130 clnt->proto_version = p9_proto_2000u;
131 clnt->msize = 8192;
132
133 if (!opts)
134 return 0;
135
136 tmp_options = kstrdup(opts, GFP_KERNEL);
137 if (!tmp_options) {
138 p9_debug(P9_DEBUG_ERROR,
139 "failed to allocate copy of option string\n");
140 return -ENOMEM;
141 }
142 options = tmp_options;
143
144 while ((p = strsep(&options, ",")) != NULL) {
145 int token, r;
146 if (!*p)
147 continue;
148 token = match_token(p, tokens, args);
149 switch (token) {
150 case Opt_msize:
151 r = match_int(&args[0], &option);
152 if (r < 0) {
153 p9_debug(P9_DEBUG_ERROR,
154 "integer field, but no integer?\n");
155 ret = r;
156 continue;
157 }
158 clnt->msize = option;
159 break;
160 case Opt_trans:
161 s = match_strdup(&args[0]);
162 if (!s) {
163 ret = -ENOMEM;
164 p9_debug(P9_DEBUG_ERROR,
165 "problem allocating copy of trans arg\n");
166 goto free_and_return;
167 }
168 clnt->trans_mod = v9fs_get_trans_by_name(s);
169 if (clnt->trans_mod == NULL) {
170 pr_info("Could not find request transport: %s\n",
171 s);
172 ret = -EINVAL;
173 kfree(s);
174 goto free_and_return;
175 }
176 kfree(s);
177 break;
178 case Opt_legacy:
179 clnt->proto_version = p9_proto_legacy;
180 break;
181 case Opt_version:
182 s = match_strdup(&args[0]);
183 if (!s) {
184 ret = -ENOMEM;
185 p9_debug(P9_DEBUG_ERROR,
186 "problem allocating copy of version arg\n");
187 goto free_and_return;
188 }
189 ret = get_protocol_version(s);
190 if (ret == -EINVAL) {
191 kfree(s);
192 goto free_and_return;
193 }
194 kfree(s);
195 clnt->proto_version = ret;
196 break;
197 default:
198 continue;
199 }
200 }
201
202 free_and_return:
203 kfree(tmp_options);
204 return ret;
205 }
206
207 /**
208 * p9_tag_alloc - lookup/allocate a request by tag
209 * @c: client session to lookup tag within
210 * @tag: numeric id for transaction
211 *
212 * this is a simple array lookup, but will grow the
213 * request_slots as necessary to accommodate transaction
214 * ids which did not previously have a slot.
215 *
216 * this code relies on the client spinlock to manage locks, its
217 * possible we should switch to something else, but I'd rather
218 * stick with something low-overhead for the common case.
219 *
220 */
221
222 static struct p9_req_t *
223 p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
224 {
225 unsigned long flags;
226 int row, col;
227 struct p9_req_t *req;
228 int alloc_msize = min(c->msize, max_size);
229
230 /* This looks up the original request by tag so we know which
231 * buffer to read the data into */
232 tag++;
233
234 if (tag >= c->max_tag) {
235 spin_lock_irqsave(&c->lock, flags);
236 /* check again since original check was outside of lock */
237 while (tag >= c->max_tag) {
238 row = (tag / P9_ROW_MAXTAG);
239 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
240 sizeof(struct p9_req_t), GFP_ATOMIC);
241
242 if (!c->reqs[row]) {
243 pr_err("Couldn't grow tag array\n");
244 spin_unlock_irqrestore(&c->lock, flags);
245 return ERR_PTR(-ENOMEM);
246 }
247 for (col = 0; col < P9_ROW_MAXTAG; col++) {
248 c->reqs[row][col].status = REQ_STATUS_IDLE;
249 c->reqs[row][col].tc = NULL;
250 }
251 c->max_tag += P9_ROW_MAXTAG;
252 }
253 spin_unlock_irqrestore(&c->lock, flags);
254 }
255 row = tag / P9_ROW_MAXTAG;
256 col = tag % P9_ROW_MAXTAG;
257
258 req = &c->reqs[row][col];
259 if (!req->tc) {
260 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
261 if (!req->wq) {
262 pr_err("Couldn't grow tag array\n");
263 return ERR_PTR(-ENOMEM);
264 }
265 init_waitqueue_head(req->wq);
266 req->tc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
267 GFP_NOFS);
268 req->rc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
269 GFP_NOFS);
270 if ((!req->tc) || (!req->rc)) {
271 pr_err("Couldn't grow tag array\n");
272 kfree(req->tc);
273 kfree(req->rc);
274 kfree(req->wq);
275 req->tc = req->rc = NULL;
276 req->wq = NULL;
277 return ERR_PTR(-ENOMEM);
278 }
279 req->tc->capacity = alloc_msize;
280 req->rc->capacity = alloc_msize;
281 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
282 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
283 }
284
285 p9pdu_reset(req->tc);
286 p9pdu_reset(req->rc);
287
288 req->tc->tag = tag-1;
289 req->status = REQ_STATUS_ALLOC;
290
291 return &c->reqs[row][col];
292 }
293
294 /**
295 * p9_tag_lookup - lookup a request by tag
296 * @c: client session to lookup tag within
297 * @tag: numeric id for transaction
298 *
299 */
300
301 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
302 {
303 int row, col;
304
305 /* This looks up the original request by tag so we know which
306 * buffer to read the data into */
307 tag++;
308
309 if(tag >= c->max_tag)
310 return NULL;
311
312 row = tag / P9_ROW_MAXTAG;
313 col = tag % P9_ROW_MAXTAG;
314
315 return &c->reqs[row][col];
316 }
317 EXPORT_SYMBOL(p9_tag_lookup);
318
319 /**
320 * p9_tag_init - setup tags structure and contents
321 * @c: v9fs client struct
322 *
323 * This initializes the tags structure for each client instance.
324 *
325 */
326
327 static int p9_tag_init(struct p9_client *c)
328 {
329 int err = 0;
330
331 c->tagpool = p9_idpool_create();
332 if (IS_ERR(c->tagpool)) {
333 err = PTR_ERR(c->tagpool);
334 goto error;
335 }
336 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
337 if (err < 0) {
338 p9_idpool_destroy(c->tagpool);
339 goto error;
340 }
341 c->max_tag = 0;
342 error:
343 return err;
344 }
345
346 /**
347 * p9_tag_cleanup - cleans up tags structure and reclaims resources
348 * @c: v9fs client struct
349 *
350 * This frees resources associated with the tags structure
351 *
352 */
353 static void p9_tag_cleanup(struct p9_client *c)
354 {
355 int row, col;
356
357 /* check to insure all requests are idle */
358 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
359 for (col = 0; col < P9_ROW_MAXTAG; col++) {
360 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
361 p9_debug(P9_DEBUG_MUX,
362 "Attempting to cleanup non-free tag %d,%d\n",
363 row, col);
364 /* TODO: delay execution of cleanup */
365 return;
366 }
367 }
368 }
369
370 if (c->tagpool) {
371 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
372 p9_idpool_destroy(c->tagpool);
373 }
374
375 /* free requests associated with tags */
376 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
377 for (col = 0; col < P9_ROW_MAXTAG; col++) {
378 kfree(c->reqs[row][col].wq);
379 kfree(c->reqs[row][col].tc);
380 kfree(c->reqs[row][col].rc);
381 }
382 kfree(c->reqs[row]);
383 }
384 c->max_tag = 0;
385 }
386
387 /**
388 * p9_free_req - free a request and clean-up as necessary
389 * c: client state
390 * r: request to release
391 *
392 */
393
394 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
395 {
396 int tag = r->tc->tag;
397 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
398
399 r->status = REQ_STATUS_IDLE;
400 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
401 p9_idpool_put(tag, c->tagpool);
402 }
403
404 /**
405 * p9_client_cb - call back from transport to client
406 * c: client state
407 * req: request received
408 *
409 */
410 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
411 {
412 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
413 wake_up(req->wq);
414 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
415 }
416 EXPORT_SYMBOL(p9_client_cb);
417
418 /**
419 * p9_parse_header - parse header arguments out of a packet
420 * @pdu: packet to parse
421 * @size: size of packet
422 * @type: type of request
423 * @tag: tag of packet
424 * @rewind: set if we need to rewind offset afterwards
425 */
426
427 int
428 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
429 int rewind)
430 {
431 int8_t r_type;
432 int16_t r_tag;
433 int32_t r_size;
434 int offset = pdu->offset;
435 int err;
436
437 pdu->offset = 0;
438 if (pdu->size == 0)
439 pdu->size = 7;
440
441 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
442 if (err)
443 goto rewind_and_exit;
444
445 pdu->size = r_size;
446 pdu->id = r_type;
447 pdu->tag = r_tag;
448
449 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
450 pdu->size, pdu->id, pdu->tag);
451
452 if (type)
453 *type = r_type;
454 if (tag)
455 *tag = r_tag;
456 if (size)
457 *size = r_size;
458
459
460 rewind_and_exit:
461 if (rewind)
462 pdu->offset = offset;
463 return err;
464 }
465 EXPORT_SYMBOL(p9_parse_header);
466
467 /**
468 * p9_check_errors - check 9p packet for error return and process it
469 * @c: current client instance
470 * @req: request to parse and check for error conditions
471 *
472 * returns error code if one is discovered, otherwise returns 0
473 *
474 * this will have to be more complicated if we have multiple
475 * error packet types
476 */
477
478 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
479 {
480 int8_t type;
481 int err;
482 int ecode;
483
484 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
485 /*
486 * dump the response from server
487 * This should be after check errors which poplulate pdu_fcall.
488 */
489 trace_9p_protocol_dump(c, req->rc);
490 if (err) {
491 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
492 return err;
493 }
494 if (type != P9_RERROR && type != P9_RLERROR)
495 return 0;
496
497 if (!p9_is_proto_dotl(c)) {
498 char *ename;
499 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
500 &ename, &ecode);
501 if (err)
502 goto out_err;
503
504 if (p9_is_proto_dotu(c))
505 err = -ecode;
506
507 if (!err || !IS_ERR_VALUE(err)) {
508 err = p9_errstr2errno(ename, strlen(ename));
509
510 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
511 -ecode, ename);
512 }
513 kfree(ename);
514 } else {
515 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
516 err = -ecode;
517
518 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
519 }
520
521 return err;
522
523 out_err:
524 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
525
526 return err;
527 }
528
529 /**
530 * p9_check_zc_errors - check 9p packet for error return and process it
531 * @c: current client instance
532 * @req: request to parse and check for error conditions
533 * @in_hdrlen: Size of response protocol buffer.
534 *
535 * returns error code if one is discovered, otherwise returns 0
536 *
537 * this will have to be more complicated if we have multiple
538 * error packet types
539 */
540
541 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
542 char *uidata, int in_hdrlen, int kern_buf)
543 {
544 int err;
545 int ecode;
546 int8_t type;
547 char *ename = NULL;
548
549 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
550 /*
551 * dump the response from server
552 * This should be after parse_header which poplulate pdu_fcall.
553 */
554 trace_9p_protocol_dump(c, req->rc);
555 if (err) {
556 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
557 return err;
558 }
559
560 if (type != P9_RERROR && type != P9_RLERROR)
561 return 0;
562
563 if (!p9_is_proto_dotl(c)) {
564 /* Error is reported in string format */
565 uint16_t len;
566 /* 7 = header size for RERROR, 2 is the size of string len; */
567 int inline_len = in_hdrlen - (7 + 2);
568
569 /* Read the size of error string */
570 err = p9pdu_readf(req->rc, c->proto_version, "w", &len);
571 if (err)
572 goto out_err;
573
574 ename = kmalloc(len + 1, GFP_NOFS);
575 if (!ename) {
576 err = -ENOMEM;
577 goto out_err;
578 }
579 if (len <= inline_len) {
580 /* We have error in protocol buffer itself */
581 if (pdu_read(req->rc, ename, len)) {
582 err = -EFAULT;
583 goto out_free;
584
585 }
586 } else {
587 /*
588 * Part of the data is in user space buffer.
589 */
590 if (pdu_read(req->rc, ename, inline_len)) {
591 err = -EFAULT;
592 goto out_free;
593
594 }
595 if (kern_buf) {
596 memcpy(ename + inline_len, uidata,
597 len - inline_len);
598 } else {
599 err = copy_from_user(ename + inline_len,
600 uidata, len - inline_len);
601 if (err) {
602 err = -EFAULT;
603 goto out_free;
604 }
605 }
606 }
607 ename[len] = 0;
608 if (p9_is_proto_dotu(c)) {
609 /* For dotu we also have error code */
610 err = p9pdu_readf(req->rc,
611 c->proto_version, "d", &ecode);
612 if (err)
613 goto out_free;
614 err = -ecode;
615 }
616 if (!err || !IS_ERR_VALUE(err)) {
617 err = p9_errstr2errno(ename, strlen(ename));
618
619 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
620 -ecode, ename);
621 }
622 kfree(ename);
623 } else {
624 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
625 err = -ecode;
626
627 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
628 }
629 return err;
630
631 out_free:
632 kfree(ename);
633 out_err:
634 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
635 return err;
636 }
637
638 static struct p9_req_t *
639 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
640
641 /**
642 * p9_client_flush - flush (cancel) a request
643 * @c: client state
644 * @oldreq: request to cancel
645 *
646 * This sents a flush for a particular request and links
647 * the flush request to the original request. The current
648 * code only supports a single flush request although the protocol
649 * allows for multiple flush requests to be sent for a single request.
650 *
651 */
652
653 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
654 {
655 struct p9_req_t *req;
656 int16_t oldtag;
657 int err;
658
659 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
660 if (err)
661 return err;
662
663 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
664
665 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
666 if (IS_ERR(req))
667 return PTR_ERR(req);
668
669
670 /* if we haven't received a response for oldreq,
671 remove it from the list. */
672 spin_lock(&c->lock);
673 if (oldreq->status == REQ_STATUS_FLSH)
674 list_del(&oldreq->req_list);
675 spin_unlock(&c->lock);
676
677 p9_free_req(c, req);
678 return 0;
679 }
680
681 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
682 int8_t type, int req_size,
683 const char *fmt, va_list ap)
684 {
685 int tag, err;
686 struct p9_req_t *req;
687
688 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
689
690 /* we allow for any status other than disconnected */
691 if (c->status == Disconnected)
692 return ERR_PTR(-EIO);
693
694 /* if status is begin_disconnected we allow only clunk request */
695 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
696 return ERR_PTR(-EIO);
697
698 tag = P9_NOTAG;
699 if (type != P9_TVERSION) {
700 tag = p9_idpool_get(c->tagpool);
701 if (tag < 0)
702 return ERR_PTR(-ENOMEM);
703 }
704
705 req = p9_tag_alloc(c, tag, req_size);
706 if (IS_ERR(req))
707 return req;
708
709 /* marshall the data */
710 p9pdu_prepare(req->tc, tag, type);
711 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
712 if (err)
713 goto reterr;
714 p9pdu_finalize(c, req->tc);
715 trace_9p_client_req(c, type, tag);
716 return req;
717 reterr:
718 p9_free_req(c, req);
719 return ERR_PTR(err);
720 }
721
722 /**
723 * p9_client_rpc - issue a request and wait for a response
724 * @c: client session
725 * @type: type of request
726 * @fmt: protocol format string (see protocol.c)
727 *
728 * Returns request structure (which client must free using p9_free_req)
729 */
730
731 static struct p9_req_t *
732 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
733 {
734 va_list ap;
735 int sigpending, err;
736 unsigned long flags;
737 struct p9_req_t *req;
738
739 va_start(ap, fmt);
740 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
741 va_end(ap);
742 if (IS_ERR(req))
743 return req;
744
745 if (signal_pending(current)) {
746 sigpending = 1;
747 clear_thread_flag(TIF_SIGPENDING);
748 } else
749 sigpending = 0;
750
751 err = c->trans_mod->request(c, req);
752 if (err < 0) {
753 if (err != -ERESTARTSYS && err != -EFAULT)
754 c->status = Disconnected;
755 goto reterr;
756 }
757 again:
758 /* Wait for the response */
759 err = wait_event_interruptible(*req->wq,
760 req->status >= REQ_STATUS_RCVD);
761
762 if ((err == -ERESTARTSYS) && (c->status == Connected)
763 && (type == P9_TFLUSH)) {
764 sigpending = 1;
765 clear_thread_flag(TIF_SIGPENDING);
766 goto again;
767 }
768
769 if (req->status == REQ_STATUS_ERROR) {
770 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
771 err = req->t_err;
772 }
773 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
774 p9_debug(P9_DEBUG_MUX, "flushing\n");
775 sigpending = 1;
776 clear_thread_flag(TIF_SIGPENDING);
777
778 if (c->trans_mod->cancel(c, req))
779 p9_client_flush(c, req);
780
781 /* if we received the response anyway, don't signal error */
782 if (req->status == REQ_STATUS_RCVD)
783 err = 0;
784 }
785 if (sigpending) {
786 spin_lock_irqsave(&current->sighand->siglock, flags);
787 recalc_sigpending();
788 spin_unlock_irqrestore(&current->sighand->siglock, flags);
789 }
790 if (err < 0)
791 goto reterr;
792
793 err = p9_check_errors(c, req);
794 trace_9p_client_res(c, type, req->rc->tag, err);
795 if (!err)
796 return req;
797 reterr:
798 p9_free_req(c, req);
799 return ERR_PTR(safe_errno(err));
800 }
801
802 /**
803 * p9_client_zc_rpc - issue a request and wait for a response
804 * @c: client session
805 * @type: type of request
806 * @uidata: user bffer that should be ued for zero copy read
807 * @uodata: user buffer that shoud be user for zero copy write
808 * @inlen: read buffer size
809 * @olen: write buffer size
810 * @hdrlen: reader header size, This is the size of response protocol data
811 * @fmt: protocol format string (see protocol.c)
812 *
813 * Returns request structure (which client must free using p9_free_req)
814 */
815 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
816 char *uidata, char *uodata,
817 int inlen, int olen, int in_hdrlen,
818 int kern_buf, const char *fmt, ...)
819 {
820 va_list ap;
821 int sigpending, err;
822 unsigned long flags;
823 struct p9_req_t *req;
824
825 va_start(ap, fmt);
826 /*
827 * We allocate a inline protocol data of only 4k bytes.
828 * The actual content is passed in zero-copy fashion.
829 */
830 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
831 va_end(ap);
832 if (IS_ERR(req))
833 return req;
834
835 if (signal_pending(current)) {
836 sigpending = 1;
837 clear_thread_flag(TIF_SIGPENDING);
838 } else
839 sigpending = 0;
840
841 /* If we are called with KERNEL_DS force kern_buf */
842 if (segment_eq(get_fs(), KERNEL_DS))
843 kern_buf = 1;
844
845 err = c->trans_mod->zc_request(c, req, uidata, uodata,
846 inlen, olen, in_hdrlen, kern_buf);
847 if (err < 0) {
848 if (err == -EIO)
849 c->status = Disconnected;
850 goto reterr;
851 }
852 if (req->status == REQ_STATUS_ERROR) {
853 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
854 err = req->t_err;
855 }
856 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
857 p9_debug(P9_DEBUG_MUX, "flushing\n");
858 sigpending = 1;
859 clear_thread_flag(TIF_SIGPENDING);
860
861 if (c->trans_mod->cancel(c, req))
862 p9_client_flush(c, req);
863
864 /* if we received the response anyway, don't signal error */
865 if (req->status == REQ_STATUS_RCVD)
866 err = 0;
867 }
868 if (sigpending) {
869 spin_lock_irqsave(&current->sighand->siglock, flags);
870 recalc_sigpending();
871 spin_unlock_irqrestore(&current->sighand->siglock, flags);
872 }
873 if (err < 0)
874 goto reterr;
875
876 err = p9_check_zc_errors(c, req, uidata, in_hdrlen, kern_buf);
877 trace_9p_client_res(c, type, req->rc->tag, err);
878 if (!err)
879 return req;
880 reterr:
881 p9_free_req(c, req);
882 return ERR_PTR(safe_errno(err));
883 }
884
885 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
886 {
887 int ret;
888 struct p9_fid *fid;
889 unsigned long flags;
890
891 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
892 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
893 if (!fid)
894 return ERR_PTR(-ENOMEM);
895
896 ret = p9_idpool_get(clnt->fidpool);
897 if (ret < 0) {
898 ret = -ENOSPC;
899 goto error;
900 }
901 fid->fid = ret;
902
903 memset(&fid->qid, 0, sizeof(struct p9_qid));
904 fid->mode = -1;
905 fid->uid = current_fsuid();
906 fid->clnt = clnt;
907 fid->rdir = NULL;
908 spin_lock_irqsave(&clnt->lock, flags);
909 list_add(&fid->flist, &clnt->fidlist);
910 spin_unlock_irqrestore(&clnt->lock, flags);
911
912 return fid;
913
914 error:
915 kfree(fid);
916 return ERR_PTR(ret);
917 }
918
919 static void p9_fid_destroy(struct p9_fid *fid)
920 {
921 struct p9_client *clnt;
922 unsigned long flags;
923
924 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
925 clnt = fid->clnt;
926 p9_idpool_put(fid->fid, clnt->fidpool);
927 spin_lock_irqsave(&clnt->lock, flags);
928 list_del(&fid->flist);
929 spin_unlock_irqrestore(&clnt->lock, flags);
930 kfree(fid->rdir);
931 kfree(fid);
932 }
933
934 static int p9_client_version(struct p9_client *c)
935 {
936 int err = 0;
937 struct p9_req_t *req;
938 char *version;
939 int msize;
940
941 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
942 c->msize, c->proto_version);
943
944 switch (c->proto_version) {
945 case p9_proto_2000L:
946 req = p9_client_rpc(c, P9_TVERSION, "ds",
947 c->msize, "9P2000.L");
948 break;
949 case p9_proto_2000u:
950 req = p9_client_rpc(c, P9_TVERSION, "ds",
951 c->msize, "9P2000.u");
952 break;
953 case p9_proto_legacy:
954 req = p9_client_rpc(c, P9_TVERSION, "ds",
955 c->msize, "9P2000");
956 break;
957 default:
958 return -EINVAL;
959 break;
960 }
961
962 if (IS_ERR(req))
963 return PTR_ERR(req);
964
965 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
966 if (err) {
967 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
968 trace_9p_protocol_dump(c, req->rc);
969 goto error;
970 }
971
972 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
973 if (!strncmp(version, "9P2000.L", 8))
974 c->proto_version = p9_proto_2000L;
975 else if (!strncmp(version, "9P2000.u", 8))
976 c->proto_version = p9_proto_2000u;
977 else if (!strncmp(version, "9P2000", 6))
978 c->proto_version = p9_proto_legacy;
979 else {
980 err = -EREMOTEIO;
981 goto error;
982 }
983
984 if (msize < c->msize)
985 c->msize = msize;
986
987 error:
988 kfree(version);
989 p9_free_req(c, req);
990
991 return err;
992 }
993
994 struct p9_client *p9_client_create(const char *dev_name, char *options)
995 {
996 int err;
997 struct p9_client *clnt;
998
999 err = 0;
1000 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
1001 if (!clnt)
1002 return ERR_PTR(-ENOMEM);
1003
1004 clnt->trans_mod = NULL;
1005 clnt->trans = NULL;
1006 spin_lock_init(&clnt->lock);
1007 INIT_LIST_HEAD(&clnt->fidlist);
1008
1009 err = p9_tag_init(clnt);
1010 if (err < 0)
1011 goto free_client;
1012
1013 err = parse_opts(options, clnt);
1014 if (err < 0)
1015 goto destroy_tagpool;
1016
1017 if (!clnt->trans_mod)
1018 clnt->trans_mod = v9fs_get_default_trans();
1019
1020 if (clnt->trans_mod == NULL) {
1021 err = -EPROTONOSUPPORT;
1022 p9_debug(P9_DEBUG_ERROR,
1023 "No transport defined or default transport\n");
1024 goto destroy_tagpool;
1025 }
1026
1027 clnt->fidpool = p9_idpool_create();
1028 if (IS_ERR(clnt->fidpool)) {
1029 err = PTR_ERR(clnt->fidpool);
1030 goto put_trans;
1031 }
1032
1033 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1034 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1035
1036 err = clnt->trans_mod->create(clnt, dev_name, options);
1037 if (err)
1038 goto destroy_fidpool;
1039
1040 if (clnt->msize > clnt->trans_mod->maxsize)
1041 clnt->msize = clnt->trans_mod->maxsize;
1042
1043 err = p9_client_version(clnt);
1044 if (err)
1045 goto close_trans;
1046
1047 return clnt;
1048
1049 close_trans:
1050 clnt->trans_mod->close(clnt);
1051 destroy_fidpool:
1052 p9_idpool_destroy(clnt->fidpool);
1053 put_trans:
1054 v9fs_put_trans(clnt->trans_mod);
1055 destroy_tagpool:
1056 p9_idpool_destroy(clnt->tagpool);
1057 free_client:
1058 kfree(clnt);
1059 return ERR_PTR(err);
1060 }
1061 EXPORT_SYMBOL(p9_client_create);
1062
1063 void p9_client_destroy(struct p9_client *clnt)
1064 {
1065 struct p9_fid *fid, *fidptr;
1066
1067 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1068
1069 if (clnt->trans_mod)
1070 clnt->trans_mod->close(clnt);
1071
1072 v9fs_put_trans(clnt->trans_mod);
1073
1074 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
1075 pr_info("Found fid %d not clunked\n", fid->fid);
1076 p9_fid_destroy(fid);
1077 }
1078
1079 if (clnt->fidpool)
1080 p9_idpool_destroy(clnt->fidpool);
1081
1082 p9_tag_cleanup(clnt);
1083
1084 kfree(clnt);
1085 }
1086 EXPORT_SYMBOL(p9_client_destroy);
1087
1088 void p9_client_disconnect(struct p9_client *clnt)
1089 {
1090 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1091 clnt->status = Disconnected;
1092 }
1093 EXPORT_SYMBOL(p9_client_disconnect);
1094
1095 void p9_client_begin_disconnect(struct p9_client *clnt)
1096 {
1097 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1098 clnt->status = BeginDisconnect;
1099 }
1100 EXPORT_SYMBOL(p9_client_begin_disconnect);
1101
1102 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1103 char *uname, u32 n_uname, char *aname)
1104 {
1105 int err = 0;
1106 struct p9_req_t *req;
1107 struct p9_fid *fid;
1108 struct p9_qid qid;
1109
1110
1111 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1112 afid ? afid->fid : -1, uname, aname);
1113 fid = p9_fid_create(clnt);
1114 if (IS_ERR(fid)) {
1115 err = PTR_ERR(fid);
1116 fid = NULL;
1117 goto error;
1118 }
1119
1120 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
1121 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1122 if (IS_ERR(req)) {
1123 err = PTR_ERR(req);
1124 goto error;
1125 }
1126
1127 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
1128 if (err) {
1129 trace_9p_protocol_dump(clnt, req->rc);
1130 p9_free_req(clnt, req);
1131 goto error;
1132 }
1133
1134 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1135 qid.type, (unsigned long long)qid.path, qid.version);
1136
1137 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1138
1139 p9_free_req(clnt, req);
1140 return fid;
1141
1142 error:
1143 if (fid)
1144 p9_fid_destroy(fid);
1145 return ERR_PTR(err);
1146 }
1147 EXPORT_SYMBOL(p9_client_attach);
1148
1149 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1150 char **wnames, int clone)
1151 {
1152 int err;
1153 struct p9_client *clnt;
1154 struct p9_fid *fid;
1155 struct p9_qid *wqids;
1156 struct p9_req_t *req;
1157 uint16_t nwqids, count;
1158
1159 err = 0;
1160 wqids = NULL;
1161 clnt = oldfid->clnt;
1162 if (clone) {
1163 fid = p9_fid_create(clnt);
1164 if (IS_ERR(fid)) {
1165 err = PTR_ERR(fid);
1166 fid = NULL;
1167 goto error;
1168 }
1169
1170 fid->uid = oldfid->uid;
1171 } else
1172 fid = oldfid;
1173
1174
1175 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1176 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1177
1178 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1179 nwname, wnames);
1180 if (IS_ERR(req)) {
1181 err = PTR_ERR(req);
1182 goto error;
1183 }
1184
1185 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1186 if (err) {
1187 trace_9p_protocol_dump(clnt, req->rc);
1188 p9_free_req(clnt, req);
1189 goto clunk_fid;
1190 }
1191 p9_free_req(clnt, req);
1192
1193 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1194
1195 if (nwqids != nwname) {
1196 err = -ENOENT;
1197 goto clunk_fid;
1198 }
1199
1200 for (count = 0; count < nwqids; count++)
1201 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1202 count, wqids[count].type,
1203 (unsigned long long)wqids[count].path,
1204 wqids[count].version);
1205
1206 if (nwname)
1207 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1208 else
1209 fid->qid = oldfid->qid;
1210
1211 kfree(wqids);
1212 return fid;
1213
1214 clunk_fid:
1215 kfree(wqids);
1216 p9_client_clunk(fid);
1217 fid = NULL;
1218
1219 error:
1220 if (fid && (fid != oldfid))
1221 p9_fid_destroy(fid);
1222
1223 return ERR_PTR(err);
1224 }
1225 EXPORT_SYMBOL(p9_client_walk);
1226
1227 int p9_client_open(struct p9_fid *fid, int mode)
1228 {
1229 int err;
1230 struct p9_client *clnt;
1231 struct p9_req_t *req;
1232 struct p9_qid qid;
1233 int iounit;
1234
1235 clnt = fid->clnt;
1236 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1237 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1238 err = 0;
1239
1240 if (fid->mode != -1)
1241 return -EINVAL;
1242
1243 if (p9_is_proto_dotl(clnt))
1244 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1245 else
1246 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1247 if (IS_ERR(req)) {
1248 err = PTR_ERR(req);
1249 goto error;
1250 }
1251
1252 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1253 if (err) {
1254 trace_9p_protocol_dump(clnt, req->rc);
1255 goto free_and_error;
1256 }
1257
1258 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1259 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1260 (unsigned long long)qid.path, qid.version, iounit);
1261
1262 fid->mode = mode;
1263 fid->iounit = iounit;
1264
1265 free_and_error:
1266 p9_free_req(clnt, req);
1267 error:
1268 return err;
1269 }
1270 EXPORT_SYMBOL(p9_client_open);
1271
1272 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1273 gid_t gid, struct p9_qid *qid)
1274 {
1275 int err = 0;
1276 struct p9_client *clnt;
1277 struct p9_req_t *req;
1278 int iounit;
1279
1280 p9_debug(P9_DEBUG_9P,
1281 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1282 ofid->fid, name, flags, mode, gid);
1283 clnt = ofid->clnt;
1284
1285 if (ofid->mode != -1)
1286 return -EINVAL;
1287
1288 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags,
1289 mode, gid);
1290 if (IS_ERR(req)) {
1291 err = PTR_ERR(req);
1292 goto error;
1293 }
1294
1295 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1296 if (err) {
1297 trace_9p_protocol_dump(clnt, req->rc);
1298 goto free_and_error;
1299 }
1300
1301 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1302 qid->type,
1303 (unsigned long long)qid->path,
1304 qid->version, iounit);
1305
1306 ofid->mode = mode;
1307 ofid->iounit = iounit;
1308
1309 free_and_error:
1310 p9_free_req(clnt, req);
1311 error:
1312 return err;
1313 }
1314 EXPORT_SYMBOL(p9_client_create_dotl);
1315
1316 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1317 char *extension)
1318 {
1319 int err;
1320 struct p9_client *clnt;
1321 struct p9_req_t *req;
1322 struct p9_qid qid;
1323 int iounit;
1324
1325 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1326 fid->fid, name, perm, mode);
1327 err = 0;
1328 clnt = fid->clnt;
1329
1330 if (fid->mode != -1)
1331 return -EINVAL;
1332
1333 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1334 mode, extension);
1335 if (IS_ERR(req)) {
1336 err = PTR_ERR(req);
1337 goto error;
1338 }
1339
1340 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1341 if (err) {
1342 trace_9p_protocol_dump(clnt, req->rc);
1343 goto free_and_error;
1344 }
1345
1346 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1347 qid.type,
1348 (unsigned long long)qid.path,
1349 qid.version, iounit);
1350
1351 fid->mode = mode;
1352 fid->iounit = iounit;
1353
1354 free_and_error:
1355 p9_free_req(clnt, req);
1356 error:
1357 return err;
1358 }
1359 EXPORT_SYMBOL(p9_client_fcreate);
1360
1361 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid,
1362 struct p9_qid *qid)
1363 {
1364 int err = 0;
1365 struct p9_client *clnt;
1366 struct p9_req_t *req;
1367
1368 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1369 dfid->fid, name, symtgt);
1370 clnt = dfid->clnt;
1371
1372 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt,
1373 gid);
1374 if (IS_ERR(req)) {
1375 err = PTR_ERR(req);
1376 goto error;
1377 }
1378
1379 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1380 if (err) {
1381 trace_9p_protocol_dump(clnt, req->rc);
1382 goto free_and_error;
1383 }
1384
1385 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1386 qid->type, (unsigned long long)qid->path, qid->version);
1387
1388 free_and_error:
1389 p9_free_req(clnt, req);
1390 error:
1391 return err;
1392 }
1393 EXPORT_SYMBOL(p9_client_symlink);
1394
1395 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1396 {
1397 struct p9_client *clnt;
1398 struct p9_req_t *req;
1399
1400 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1401 dfid->fid, oldfid->fid, newname);
1402 clnt = dfid->clnt;
1403 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1404 newname);
1405 if (IS_ERR(req))
1406 return PTR_ERR(req);
1407
1408 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1409 p9_free_req(clnt, req);
1410 return 0;
1411 }
1412 EXPORT_SYMBOL(p9_client_link);
1413
1414 int p9_client_fsync(struct p9_fid *fid, int datasync)
1415 {
1416 int err;
1417 struct p9_client *clnt;
1418 struct p9_req_t *req;
1419
1420 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1421 fid->fid, datasync);
1422 err = 0;
1423 clnt = fid->clnt;
1424
1425 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1426 if (IS_ERR(req)) {
1427 err = PTR_ERR(req);
1428 goto error;
1429 }
1430
1431 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1432
1433 p9_free_req(clnt, req);
1434
1435 error:
1436 return err;
1437 }
1438 EXPORT_SYMBOL(p9_client_fsync);
1439
1440 int p9_client_clunk(struct p9_fid *fid)
1441 {
1442 int err;
1443 struct p9_client *clnt;
1444 struct p9_req_t *req;
1445 int retries = 0;
1446
1447 if (!fid) {
1448 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1449 __func__, task_pid_nr(current));
1450 dump_stack();
1451 return 0;
1452 }
1453
1454 again:
1455 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1456 retries);
1457 err = 0;
1458 clnt = fid->clnt;
1459
1460 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1461 if (IS_ERR(req)) {
1462 err = PTR_ERR(req);
1463 goto error;
1464 }
1465
1466 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1467
1468 p9_free_req(clnt, req);
1469 error:
1470 /*
1471 * Fid is not valid even after a failed clunk
1472 * If interrupted, retry once then give up and
1473 * leak fid until umount.
1474 */
1475 if (err == -ERESTARTSYS) {
1476 if (retries++ == 0)
1477 goto again;
1478 } else
1479 p9_fid_destroy(fid);
1480 return err;
1481 }
1482 EXPORT_SYMBOL(p9_client_clunk);
1483
1484 int p9_client_remove(struct p9_fid *fid)
1485 {
1486 int err;
1487 struct p9_client *clnt;
1488 struct p9_req_t *req;
1489
1490 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1491 err = 0;
1492 clnt = fid->clnt;
1493
1494 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1495 if (IS_ERR(req)) {
1496 err = PTR_ERR(req);
1497 goto error;
1498 }
1499
1500 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1501
1502 p9_free_req(clnt, req);
1503 error:
1504 if (err == -ERESTARTSYS)
1505 p9_client_clunk(fid);
1506 else
1507 p9_fid_destroy(fid);
1508 return err;
1509 }
1510 EXPORT_SYMBOL(p9_client_remove);
1511
1512 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1513 {
1514 int err = 0;
1515 struct p9_req_t *req;
1516 struct p9_client *clnt;
1517
1518 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1519 dfid->fid, name, flags);
1520
1521 clnt = dfid->clnt;
1522 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1523 if (IS_ERR(req)) {
1524 err = PTR_ERR(req);
1525 goto error;
1526 }
1527 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1528
1529 p9_free_req(clnt, req);
1530 error:
1531 return err;
1532 }
1533 EXPORT_SYMBOL(p9_client_unlinkat);
1534
1535 int
1536 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1537 u32 count)
1538 {
1539 char *dataptr;
1540 int kernel_buf = 0;
1541 struct p9_req_t *req;
1542 struct p9_client *clnt;
1543 int err, rsize, non_zc = 0;
1544
1545
1546 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1547 fid->fid, (unsigned long long) offset, count);
1548 err = 0;
1549 clnt = fid->clnt;
1550
1551 rsize = fid->iounit;
1552 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1553 rsize = clnt->msize - P9_IOHDRSZ;
1554
1555 if (count < rsize)
1556 rsize = count;
1557
1558 /* Don't bother zerocopy for small IO (< 1024) */
1559 if (clnt->trans_mod->zc_request && rsize > 1024) {
1560 char *indata;
1561 if (data) {
1562 kernel_buf = 1;
1563 indata = data;
1564 } else
1565 indata = (__force char *)udata;
1566 /*
1567 * response header len is 11
1568 * PDU Header(7) + IO Size (4)
1569 */
1570 req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0,
1571 11, kernel_buf, "dqd", fid->fid,
1572 offset, rsize);
1573 } else {
1574 non_zc = 1;
1575 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1576 rsize);
1577 }
1578 if (IS_ERR(req)) {
1579 err = PTR_ERR(req);
1580 goto error;
1581 }
1582
1583 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1584 if (err) {
1585 trace_9p_protocol_dump(clnt, req->rc);
1586 goto free_and_error;
1587 }
1588
1589 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1590
1591 if (non_zc) {
1592 if (data) {
1593 memmove(data, dataptr, count);
1594 } else {
1595 err = copy_to_user(udata, dataptr, count);
1596 if (err) {
1597 err = -EFAULT;
1598 goto free_and_error;
1599 }
1600 }
1601 }
1602 p9_free_req(clnt, req);
1603 return count;
1604
1605 free_and_error:
1606 p9_free_req(clnt, req);
1607 error:
1608 return err;
1609 }
1610 EXPORT_SYMBOL(p9_client_read);
1611
1612 int
1613 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1614 u64 offset, u32 count)
1615 {
1616 int err, rsize;
1617 int kernel_buf = 0;
1618 struct p9_client *clnt;
1619 struct p9_req_t *req;
1620
1621 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1622 fid->fid, (unsigned long long) offset, count);
1623 err = 0;
1624 clnt = fid->clnt;
1625
1626 rsize = fid->iounit;
1627 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1628 rsize = clnt->msize - P9_IOHDRSZ;
1629
1630 if (count < rsize)
1631 rsize = count;
1632
1633 /* Don't bother zerocopy for small IO (< 1024) */
1634 if (clnt->trans_mod->zc_request && rsize > 1024) {
1635 char *odata;
1636 if (data) {
1637 kernel_buf = 1;
1638 odata = data;
1639 } else
1640 odata = (char *)udata;
1641 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize,
1642 P9_ZC_HDR_SZ, kernel_buf, "dqd",
1643 fid->fid, offset, rsize);
1644 } else {
1645 if (data)
1646 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
1647 offset, rsize, data);
1648 else
1649 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
1650 offset, rsize, udata);
1651 }
1652 if (IS_ERR(req)) {
1653 err = PTR_ERR(req);
1654 goto error;
1655 }
1656
1657 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1658 if (err) {
1659 trace_9p_protocol_dump(clnt, req->rc);
1660 goto free_and_error;
1661 }
1662
1663 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1664
1665 p9_free_req(clnt, req);
1666 return count;
1667
1668 free_and_error:
1669 p9_free_req(clnt, req);
1670 error:
1671 return err;
1672 }
1673 EXPORT_SYMBOL(p9_client_write);
1674
1675 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1676 {
1677 int err;
1678 struct p9_client *clnt;
1679 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1680 struct p9_req_t *req;
1681 u16 ignored;
1682
1683 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1684
1685 if (!ret)
1686 return ERR_PTR(-ENOMEM);
1687
1688 err = 0;
1689 clnt = fid->clnt;
1690
1691 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1692 if (IS_ERR(req)) {
1693 err = PTR_ERR(req);
1694 goto error;
1695 }
1696
1697 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1698 if (err) {
1699 trace_9p_protocol_dump(clnt, req->rc);
1700 p9_free_req(clnt, req);
1701 goto error;
1702 }
1703
1704 p9_debug(P9_DEBUG_9P,
1705 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1706 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1707 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1708 "<<< uid=%d gid=%d n_muid=%d\n",
1709 ret->size, ret->type, ret->dev, ret->qid.type,
1710 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1711 ret->atime, ret->mtime, (unsigned long long)ret->length,
1712 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1713 ret->n_uid, ret->n_gid, ret->n_muid);
1714
1715 p9_free_req(clnt, req);
1716 return ret;
1717
1718 error:
1719 kfree(ret);
1720 return ERR_PTR(err);
1721 }
1722 EXPORT_SYMBOL(p9_client_stat);
1723
1724 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1725 u64 request_mask)
1726 {
1727 int err;
1728 struct p9_client *clnt;
1729 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1730 GFP_KERNEL);
1731 struct p9_req_t *req;
1732
1733 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1734 fid->fid, request_mask);
1735
1736 if (!ret)
1737 return ERR_PTR(-ENOMEM);
1738
1739 err = 0;
1740 clnt = fid->clnt;
1741
1742 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1743 if (IS_ERR(req)) {
1744 err = PTR_ERR(req);
1745 goto error;
1746 }
1747
1748 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1749 if (err) {
1750 trace_9p_protocol_dump(clnt, req->rc);
1751 p9_free_req(clnt, req);
1752 goto error;
1753 }
1754
1755 p9_debug(P9_DEBUG_9P,
1756 "<<< RGETATTR st_result_mask=%lld\n"
1757 "<<< qid=%x.%llx.%x\n"
1758 "<<< st_mode=%8.8x st_nlink=%llu\n"
1759 "<<< st_uid=%d st_gid=%d\n"
1760 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1761 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1762 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1763 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1764 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1765 "<<< st_gen=%lld st_data_version=%lld",
1766 ret->st_result_mask, ret->qid.type, ret->qid.path,
1767 ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid,
1768 ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize,
1769 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1770 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1771 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1772 ret->st_gen, ret->st_data_version);
1773
1774 p9_free_req(clnt, req);
1775 return ret;
1776
1777 error:
1778 kfree(ret);
1779 return ERR_PTR(err);
1780 }
1781 EXPORT_SYMBOL(p9_client_getattr_dotl);
1782
1783 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1784 {
1785 int ret;
1786
1787 /* NOTE: size shouldn't include its own length */
1788 /* size[2] type[2] dev[4] qid[13] */
1789 /* mode[4] atime[4] mtime[4] length[8]*/
1790 /* name[s] uid[s] gid[s] muid[s] */
1791 ret = 2+4+13+4+4+4+8+2+2+2+2;
1792
1793 if (wst->name)
1794 ret += strlen(wst->name);
1795 if (wst->uid)
1796 ret += strlen(wst->uid);
1797 if (wst->gid)
1798 ret += strlen(wst->gid);
1799 if (wst->muid)
1800 ret += strlen(wst->muid);
1801
1802 if ((proto_version == p9_proto_2000u) ||
1803 (proto_version == p9_proto_2000L)) {
1804 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1805 if (wst->extension)
1806 ret += strlen(wst->extension);
1807 }
1808
1809 return ret;
1810 }
1811
1812 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1813 {
1814 int err;
1815 struct p9_req_t *req;
1816 struct p9_client *clnt;
1817
1818 err = 0;
1819 clnt = fid->clnt;
1820 wst->size = p9_client_statsize(wst, clnt->proto_version);
1821 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1822 p9_debug(P9_DEBUG_9P,
1823 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1824 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1825 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1826 " uid=%d gid=%d n_muid=%d\n",
1827 wst->size, wst->type, wst->dev, wst->qid.type,
1828 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1829 wst->atime, wst->mtime, (unsigned long long)wst->length,
1830 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1831 wst->n_uid, wst->n_gid, wst->n_muid);
1832
1833 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1834 if (IS_ERR(req)) {
1835 err = PTR_ERR(req);
1836 goto error;
1837 }
1838
1839 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1840
1841 p9_free_req(clnt, req);
1842 error:
1843 return err;
1844 }
1845 EXPORT_SYMBOL(p9_client_wstat);
1846
1847 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1848 {
1849 int err;
1850 struct p9_req_t *req;
1851 struct p9_client *clnt;
1852
1853 err = 0;
1854 clnt = fid->clnt;
1855 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1856 p9_debug(P9_DEBUG_9P,
1857 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1858 " atime_sec=%lld atime_nsec=%lld\n"
1859 " mtime_sec=%lld mtime_nsec=%lld\n",
1860 p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid,
1861 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1862 p9attr->mtime_sec, p9attr->mtime_nsec);
1863
1864 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1865
1866 if (IS_ERR(req)) {
1867 err = PTR_ERR(req);
1868 goto error;
1869 }
1870 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1871 p9_free_req(clnt, req);
1872 error:
1873 return err;
1874 }
1875 EXPORT_SYMBOL(p9_client_setattr);
1876
1877 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1878 {
1879 int err;
1880 struct p9_req_t *req;
1881 struct p9_client *clnt;
1882
1883 err = 0;
1884 clnt = fid->clnt;
1885
1886 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1887
1888 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1889 if (IS_ERR(req)) {
1890 err = PTR_ERR(req);
1891 goto error;
1892 }
1893
1894 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1895 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1896 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1897 if (err) {
1898 trace_9p_protocol_dump(clnt, req->rc);
1899 p9_free_req(clnt, req);
1900 goto error;
1901 }
1902
1903 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1904 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1905 "fsid %llu namelen %ld\n",
1906 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1907 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1908 sb->fsid, (long int)sb->namelen);
1909
1910 p9_free_req(clnt, req);
1911 error:
1912 return err;
1913 }
1914 EXPORT_SYMBOL(p9_client_statfs);
1915
1916 int p9_client_rename(struct p9_fid *fid,
1917 struct p9_fid *newdirfid, const char *name)
1918 {
1919 int err;
1920 struct p9_req_t *req;
1921 struct p9_client *clnt;
1922
1923 err = 0;
1924 clnt = fid->clnt;
1925
1926 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1927 fid->fid, newdirfid->fid, name);
1928
1929 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1930 newdirfid->fid, name);
1931 if (IS_ERR(req)) {
1932 err = PTR_ERR(req);
1933 goto error;
1934 }
1935
1936 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1937
1938 p9_free_req(clnt, req);
1939 error:
1940 return err;
1941 }
1942 EXPORT_SYMBOL(p9_client_rename);
1943
1944 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1945 struct p9_fid *newdirfid, const char *new_name)
1946 {
1947 int err;
1948 struct p9_req_t *req;
1949 struct p9_client *clnt;
1950
1951 err = 0;
1952 clnt = olddirfid->clnt;
1953
1954 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1955 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1956 newdirfid->fid, new_name);
1957
1958 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1959 old_name, newdirfid->fid, new_name);
1960 if (IS_ERR(req)) {
1961 err = PTR_ERR(req);
1962 goto error;
1963 }
1964
1965 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1966 newdirfid->fid, new_name);
1967
1968 p9_free_req(clnt, req);
1969 error:
1970 return err;
1971 }
1972 EXPORT_SYMBOL(p9_client_renameat);
1973
1974 /*
1975 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1976 */
1977 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1978 const char *attr_name, u64 *attr_size)
1979 {
1980 int err;
1981 struct p9_req_t *req;
1982 struct p9_client *clnt;
1983 struct p9_fid *attr_fid;
1984
1985 err = 0;
1986 clnt = file_fid->clnt;
1987 attr_fid = p9_fid_create(clnt);
1988 if (IS_ERR(attr_fid)) {
1989 err = PTR_ERR(attr_fid);
1990 attr_fid = NULL;
1991 goto error;
1992 }
1993 p9_debug(P9_DEBUG_9P,
1994 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
1995 file_fid->fid, attr_fid->fid, attr_name);
1996
1997 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
1998 file_fid->fid, attr_fid->fid, attr_name);
1999 if (IS_ERR(req)) {
2000 err = PTR_ERR(req);
2001 goto error;
2002 }
2003 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
2004 if (err) {
2005 trace_9p_protocol_dump(clnt, req->rc);
2006 p9_free_req(clnt, req);
2007 goto clunk_fid;
2008 }
2009 p9_free_req(clnt, req);
2010 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2011 attr_fid->fid, *attr_size);
2012 return attr_fid;
2013 clunk_fid:
2014 p9_client_clunk(attr_fid);
2015 attr_fid = NULL;
2016 error:
2017 if (attr_fid && (attr_fid != file_fid))
2018 p9_fid_destroy(attr_fid);
2019
2020 return ERR_PTR(err);
2021 }
2022 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2023
2024 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2025 u64 attr_size, int flags)
2026 {
2027 int err;
2028 struct p9_req_t *req;
2029 struct p9_client *clnt;
2030
2031 p9_debug(P9_DEBUG_9P,
2032 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2033 fid->fid, name, (long long)attr_size, flags);
2034 err = 0;
2035 clnt = fid->clnt;
2036 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2037 fid->fid, name, attr_size, flags);
2038 if (IS_ERR(req)) {
2039 err = PTR_ERR(req);
2040 goto error;
2041 }
2042 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2043 p9_free_req(clnt, req);
2044 error:
2045 return err;
2046 }
2047 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2048
2049 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2050 {
2051 int err, rsize, non_zc = 0;
2052 struct p9_client *clnt;
2053 struct p9_req_t *req;
2054 char *dataptr;
2055
2056 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2057 fid->fid, (unsigned long long) offset, count);
2058
2059 err = 0;
2060 clnt = fid->clnt;
2061
2062 rsize = fid->iounit;
2063 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2064 rsize = clnt->msize - P9_READDIRHDRSZ;
2065
2066 if (count < rsize)
2067 rsize = count;
2068
2069 /* Don't bother zerocopy for small IO (< 1024) */
2070 if (clnt->trans_mod->zc_request && rsize > 1024) {
2071 /*
2072 * response header len is 11
2073 * PDU Header(7) + IO Size (4)
2074 */
2075 req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0,
2076 11, 1, "dqd", fid->fid, offset, rsize);
2077 } else {
2078 non_zc = 1;
2079 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2080 offset, rsize);
2081 }
2082 if (IS_ERR(req)) {
2083 err = PTR_ERR(req);
2084 goto error;
2085 }
2086
2087 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2088 if (err) {
2089 trace_9p_protocol_dump(clnt, req->rc);
2090 goto free_and_error;
2091 }
2092
2093 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2094
2095 if (non_zc)
2096 memmove(data, dataptr, count);
2097
2098 p9_free_req(clnt, req);
2099 return count;
2100
2101 free_and_error:
2102 p9_free_req(clnt, req);
2103 error:
2104 return err;
2105 }
2106 EXPORT_SYMBOL(p9_client_readdir);
2107
2108 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
2109 dev_t rdev, gid_t gid, struct p9_qid *qid)
2110 {
2111 int err;
2112 struct p9_client *clnt;
2113 struct p9_req_t *req;
2114
2115 err = 0;
2116 clnt = fid->clnt;
2117 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2118 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2119 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode,
2120 MAJOR(rdev), MINOR(rdev), gid);
2121 if (IS_ERR(req))
2122 return PTR_ERR(req);
2123
2124 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2125 if (err) {
2126 trace_9p_protocol_dump(clnt, req->rc);
2127 goto error;
2128 }
2129 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2130 (unsigned long long)qid->path, qid->version);
2131
2132 error:
2133 p9_free_req(clnt, req);
2134 return err;
2135
2136 }
2137 EXPORT_SYMBOL(p9_client_mknod_dotl);
2138
2139 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
2140 gid_t gid, struct p9_qid *qid)
2141 {
2142 int err;
2143 struct p9_client *clnt;
2144 struct p9_req_t *req;
2145
2146 err = 0;
2147 clnt = fid->clnt;
2148 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2149 fid->fid, name, mode, gid);
2150 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode,
2151 gid);
2152 if (IS_ERR(req))
2153 return PTR_ERR(req);
2154
2155 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2156 if (err) {
2157 trace_9p_protocol_dump(clnt, req->rc);
2158 goto error;
2159 }
2160 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2161 (unsigned long long)qid->path, qid->version);
2162
2163 error:
2164 p9_free_req(clnt, req);
2165 return err;
2166
2167 }
2168 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2169
2170 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2171 {
2172 int err;
2173 struct p9_client *clnt;
2174 struct p9_req_t *req;
2175
2176 err = 0;
2177 clnt = fid->clnt;
2178 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2179 "start %lld length %lld proc_id %d client_id %s\n",
2180 fid->fid, flock->type, flock->flags, flock->start,
2181 flock->length, flock->proc_id, flock->client_id);
2182
2183 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2184 flock->flags, flock->start, flock->length,
2185 flock->proc_id, flock->client_id);
2186
2187 if (IS_ERR(req))
2188 return PTR_ERR(req);
2189
2190 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2191 if (err) {
2192 trace_9p_protocol_dump(clnt, req->rc);
2193 goto error;
2194 }
2195 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2196 error:
2197 p9_free_req(clnt, req);
2198 return err;
2199
2200 }
2201 EXPORT_SYMBOL(p9_client_lock_dotl);
2202
2203 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
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, ">>> TGETLOCK fid %d, type %i start %lld "
2212 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2213 glock->start, glock->length, glock->proc_id, glock->client_id);
2214
2215 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2216 glock->start, glock->length, glock->proc_id, glock->client_id);
2217
2218 if (IS_ERR(req))
2219 return PTR_ERR(req);
2220
2221 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2222 &glock->start, &glock->length, &glock->proc_id,
2223 &glock->client_id);
2224 if (err) {
2225 trace_9p_protocol_dump(clnt, req->rc);
2226 goto error;
2227 }
2228 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2229 "proc_id %d client_id %s\n", glock->type, glock->start,
2230 glock->length, glock->proc_id, glock->client_id);
2231 error:
2232 p9_free_req(clnt, req);
2233 return err;
2234 }
2235 EXPORT_SYMBOL(p9_client_getlock_dotl);
2236
2237 int p9_client_readlink(struct p9_fid *fid, char **target)
2238 {
2239 int err;
2240 struct p9_client *clnt;
2241 struct p9_req_t *req;
2242
2243 err = 0;
2244 clnt = fid->clnt;
2245 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2246
2247 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2248 if (IS_ERR(req))
2249 return PTR_ERR(req);
2250
2251 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2252 if (err) {
2253 trace_9p_protocol_dump(clnt, req->rc);
2254 goto error;
2255 }
2256 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2257 error:
2258 p9_free_req(clnt, req);
2259 return err;
2260 }
2261 EXPORT_SYMBOL(p9_client_readlink);
Linux kernel - Deliverables
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