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[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 #include <linux/module.h>
27 #include <linux/errno.h>
28 #include <linux/fs.h>
29 #include <linux/poll.h>
30 #include <linux/idr.h>
31 #include <linux/mutex.h>
32 #include <linux/slab.h>
33 #include <linux/sched.h>
34 #include <linux/uaccess.h>
35 #include <net/9p/9p.h>
36 #include <linux/parser.h>
37 #include <net/9p/client.h>
38 #include <net/9p/transport.h>
39 #include "protocol.h"
40
41 /*
42 * Client Option Parsing (code inspired by NFS code)
43 * - a little lazy - parse all client options
44 */
45
46 enum {
47 Opt_msize,
48 Opt_trans,
49 Opt_legacy,
50 Opt_version,
51 Opt_err,
52 };
53
54 static const match_table_t tokens = {
55 {Opt_msize, "msize=%u"},
56 {Opt_legacy, "noextend"},
57 {Opt_trans, "trans=%s"},
58 {Opt_version, "version=%s"},
59 {Opt_err, NULL},
60 };
61
62 inline int p9_is_proto_dotl(struct p9_client *clnt)
63 {
64 return clnt->proto_version == p9_proto_2000L;
65 }
66 EXPORT_SYMBOL(p9_is_proto_dotl);
67
68 inline int p9_is_proto_dotu(struct p9_client *clnt)
69 {
70 return clnt->proto_version == p9_proto_2000u;
71 }
72 EXPORT_SYMBOL(p9_is_proto_dotu);
73
74 /* Interpret mount option for protocol version */
75 static int get_protocol_version(char *s)
76 {
77 int version = -EINVAL;
78
79 if (!strcmp(s, "9p2000")) {
80 version = p9_proto_legacy;
81 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: Legacy\n");
82 } else if (!strcmp(s, "9p2000.u")) {
83 version = p9_proto_2000u;
84 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
85 } else if (!strcmp(s, "9p2000.L")) {
86 version = p9_proto_2000L;
87 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
88 } else
89 printk(KERN_INFO "9p: Unknown protocol version %s.\n", s);
90
91 return version;
92 }
93
94 /**
95 * parse_options - parse mount options into client structure
96 * @opts: options string passed from mount
97 * @clnt: existing v9fs client information
98 *
99 * Return 0 upon success, -ERRNO upon failure
100 */
101
102 static int parse_opts(char *opts, struct p9_client *clnt)
103 {
104 char *options, *tmp_options;
105 char *p;
106 substring_t args[MAX_OPT_ARGS];
107 int option;
108 char *s;
109 int ret = 0;
110
111 clnt->proto_version = p9_proto_2000u;
112 clnt->msize = 8192;
113
114 if (!opts)
115 return 0;
116
117 tmp_options = kstrdup(opts, GFP_KERNEL);
118 if (!tmp_options) {
119 P9_DPRINTK(P9_DEBUG_ERROR,
120 "failed to allocate copy of option string\n");
121 return -ENOMEM;
122 }
123 options = tmp_options;
124
125 while ((p = strsep(&options, ",")) != NULL) {
126 int token, r;
127 if (!*p)
128 continue;
129 token = match_token(p, tokens, args);
130 switch (token) {
131 case Opt_msize:
132 r = match_int(&args[0], &option);
133 if (r < 0) {
134 P9_DPRINTK(P9_DEBUG_ERROR,
135 "integer field, but no integer?\n");
136 ret = r;
137 continue;
138 }
139 clnt->msize = option;
140 break;
141 case Opt_trans:
142 s = match_strdup(&args[0]);
143 if (!s) {
144 ret = -ENOMEM;
145 P9_DPRINTK(P9_DEBUG_ERROR,
146 "problem allocating copy of trans arg\n");
147 goto free_and_return;
148 }
149 clnt->trans_mod = v9fs_get_trans_by_name(s);
150 if (clnt->trans_mod == NULL) {
151 printk(KERN_INFO
152 "9p: Could not find "
153 "request transport: %s\n", s);
154 ret = -EINVAL;
155 kfree(s);
156 goto free_and_return;
157 }
158 kfree(s);
159 break;
160 case Opt_legacy:
161 clnt->proto_version = p9_proto_legacy;
162 break;
163 case Opt_version:
164 s = match_strdup(&args[0]);
165 if (!s) {
166 ret = -ENOMEM;
167 P9_DPRINTK(P9_DEBUG_ERROR,
168 "problem allocating copy of version arg\n");
169 goto free_and_return;
170 }
171 ret = get_protocol_version(s);
172 if (ret == -EINVAL) {
173 kfree(s);
174 goto free_and_return;
175 }
176 kfree(s);
177 clnt->proto_version = ret;
178 break;
179 default:
180 continue;
181 }
182 }
183
184 free_and_return:
185 kfree(tmp_options);
186 return ret;
187 }
188
189 /**
190 * p9_tag_alloc - lookup/allocate a request by tag
191 * @c: client session to lookup tag within
192 * @tag: numeric id for transaction
193 *
194 * this is a simple array lookup, but will grow the
195 * request_slots as necessary to accommodate transaction
196 * ids which did not previously have a slot.
197 *
198 * this code relies on the client spinlock to manage locks, its
199 * possible we should switch to something else, but I'd rather
200 * stick with something low-overhead for the common case.
201 *
202 */
203
204 static struct p9_req_t *
205 p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
206 {
207 unsigned long flags;
208 int row, col;
209 struct p9_req_t *req;
210 int alloc_msize = min(c->msize, max_size);
211
212 /* This looks up the original request by tag so we know which
213 * buffer to read the data into */
214 tag++;
215
216 if (tag >= c->max_tag) {
217 spin_lock_irqsave(&c->lock, flags);
218 /* check again since original check was outside of lock */
219 while (tag >= c->max_tag) {
220 row = (tag / P9_ROW_MAXTAG);
221 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
222 sizeof(struct p9_req_t), GFP_ATOMIC);
223
224 if (!c->reqs[row]) {
225 printk(KERN_ERR "Couldn't grow tag array\n");
226 spin_unlock_irqrestore(&c->lock, flags);
227 return ERR_PTR(-ENOMEM);
228 }
229 for (col = 0; col < P9_ROW_MAXTAG; col++) {
230 c->reqs[row][col].status = REQ_STATUS_IDLE;
231 c->reqs[row][col].tc = NULL;
232 }
233 c->max_tag += P9_ROW_MAXTAG;
234 }
235 spin_unlock_irqrestore(&c->lock, flags);
236 }
237 row = tag / P9_ROW_MAXTAG;
238 col = tag % P9_ROW_MAXTAG;
239
240 req = &c->reqs[row][col];
241 if (!req->tc) {
242 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
243 if (!req->wq) {
244 printk(KERN_ERR "Couldn't grow tag array\n");
245 return ERR_PTR(-ENOMEM);
246 }
247 init_waitqueue_head(req->wq);
248 req->tc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
249 GFP_NOFS);
250 req->rc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
251 GFP_NOFS);
252 if ((!req->tc) || (!req->rc)) {
253 printk(KERN_ERR "Couldn't grow tag array\n");
254 kfree(req->tc);
255 kfree(req->rc);
256 kfree(req->wq);
257 req->tc = req->rc = NULL;
258 req->wq = NULL;
259 return ERR_PTR(-ENOMEM);
260 }
261 req->tc->capacity = alloc_msize;
262 req->rc->capacity = alloc_msize;
263 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
264 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
265 }
266
267 p9pdu_reset(req->tc);
268 p9pdu_reset(req->rc);
269
270 req->tc->tag = tag-1;
271 req->status = REQ_STATUS_ALLOC;
272
273 return &c->reqs[row][col];
274 }
275
276 /**
277 * p9_tag_lookup - lookup a request by tag
278 * @c: client session to lookup tag within
279 * @tag: numeric id for transaction
280 *
281 */
282
283 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
284 {
285 int row, col;
286
287 /* This looks up the original request by tag so we know which
288 * buffer to read the data into */
289 tag++;
290
291 if(tag >= c->max_tag)
292 return NULL;
293
294 row = tag / P9_ROW_MAXTAG;
295 col = tag % P9_ROW_MAXTAG;
296
297 return &c->reqs[row][col];
298 }
299 EXPORT_SYMBOL(p9_tag_lookup);
300
301 /**
302 * p9_tag_init - setup tags structure and contents
303 * @c: v9fs client struct
304 *
305 * This initializes the tags structure for each client instance.
306 *
307 */
308
309 static int p9_tag_init(struct p9_client *c)
310 {
311 int err = 0;
312
313 c->tagpool = p9_idpool_create();
314 if (IS_ERR(c->tagpool)) {
315 err = PTR_ERR(c->tagpool);
316 goto error;
317 }
318 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
319 if (err < 0) {
320 p9_idpool_destroy(c->tagpool);
321 goto error;
322 }
323 c->max_tag = 0;
324 error:
325 return err;
326 }
327
328 /**
329 * p9_tag_cleanup - cleans up tags structure and reclaims resources
330 * @c: v9fs client struct
331 *
332 * This frees resources associated with the tags structure
333 *
334 */
335 static void p9_tag_cleanup(struct p9_client *c)
336 {
337 int row, col;
338
339 /* check to insure all requests are idle */
340 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
341 for (col = 0; col < P9_ROW_MAXTAG; col++) {
342 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
343 P9_DPRINTK(P9_DEBUG_MUX,
344 "Attempting to cleanup non-free tag %d,%d\n",
345 row, col);
346 /* TODO: delay execution of cleanup */
347 return;
348 }
349 }
350 }
351
352 if (c->tagpool) {
353 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
354 p9_idpool_destroy(c->tagpool);
355 }
356
357 /* free requests associated with tags */
358 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
359 for (col = 0; col < P9_ROW_MAXTAG; col++) {
360 kfree(c->reqs[row][col].wq);
361 kfree(c->reqs[row][col].tc);
362 kfree(c->reqs[row][col].rc);
363 }
364 kfree(c->reqs[row]);
365 }
366 c->max_tag = 0;
367 }
368
369 /**
370 * p9_free_req - free a request and clean-up as necessary
371 * c: client state
372 * r: request to release
373 *
374 */
375
376 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
377 {
378 int tag = r->tc->tag;
379 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
380
381 r->status = REQ_STATUS_IDLE;
382 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
383 p9_idpool_put(tag, c->tagpool);
384 }
385
386 /**
387 * p9_client_cb - call back from transport to client
388 * c: client state
389 * req: request received
390 *
391 */
392 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
393 {
394 P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
395 wake_up(req->wq);
396 P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
397 }
398 EXPORT_SYMBOL(p9_client_cb);
399
400 /**
401 * p9_parse_header - parse header arguments out of a packet
402 * @pdu: packet to parse
403 * @size: size of packet
404 * @type: type of request
405 * @tag: tag of packet
406 * @rewind: set if we need to rewind offset afterwards
407 */
408
409 int
410 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
411 int rewind)
412 {
413 int8_t r_type;
414 int16_t r_tag;
415 int32_t r_size;
416 int offset = pdu->offset;
417 int err;
418
419 pdu->offset = 0;
420 if (pdu->size == 0)
421 pdu->size = 7;
422
423 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
424 if (err)
425 goto rewind_and_exit;
426
427 pdu->size = r_size;
428 pdu->id = r_type;
429 pdu->tag = r_tag;
430
431 P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size,
432 pdu->id, pdu->tag);
433
434 if (type)
435 *type = r_type;
436 if (tag)
437 *tag = r_tag;
438 if (size)
439 *size = r_size;
440
441
442 rewind_and_exit:
443 if (rewind)
444 pdu->offset = offset;
445 return err;
446 }
447 EXPORT_SYMBOL(p9_parse_header);
448
449 /**
450 * p9_check_errors - check 9p packet for error return and process it
451 * @c: current client instance
452 * @req: request to parse and check for error conditions
453 *
454 * returns error code if one is discovered, otherwise returns 0
455 *
456 * this will have to be more complicated if we have multiple
457 * error packet types
458 */
459
460 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
461 {
462 int8_t type;
463 int err;
464 int ecode;
465
466 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
467 if (err) {
468 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
469 return err;
470 }
471
472 if (type != P9_RERROR && type != P9_RLERROR)
473 return 0;
474
475 if (!p9_is_proto_dotl(c)) {
476 char *ename;
477 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
478 &ename, &ecode);
479 if (err)
480 goto out_err;
481
482 if (p9_is_proto_dotu(c))
483 err = -ecode;
484
485 if (!err || !IS_ERR_VALUE(err)) {
486 err = p9_errstr2errno(ename, strlen(ename));
487
488 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
489 -ecode, ename);
490 }
491 kfree(ename);
492 } else {
493 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
494 err = -ecode;
495
496 P9_DPRINTK(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
497 }
498
499 return err;
500
501 out_err:
502 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
503
504 return err;
505 }
506
507 /**
508 * p9_check_zc_errors - check 9p packet for error return and process it
509 * @c: current client instance
510 * @req: request to parse and check for error conditions
511 * @in_hdrlen: Size of response protocol buffer.
512 *
513 * returns error code if one is discovered, otherwise returns 0
514 *
515 * this will have to be more complicated if we have multiple
516 * error packet types
517 */
518
519 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
520 char *uidata, int in_hdrlen, int kern_buf)
521 {
522 int err;
523 int ecode;
524 int8_t type;
525 char *ename = NULL;
526
527 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
528 if (err) {
529 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
530 return err;
531 }
532
533 if (type != P9_RERROR && type != P9_RLERROR)
534 return 0;
535
536 if (!p9_is_proto_dotl(c)) {
537 /* Error is reported in string format */
538 uint16_t len;
539 /* 7 = header size for RERROR, 2 is the size of string len; */
540 int inline_len = in_hdrlen - (7 + 2);
541
542 /* Read the size of error string */
543 err = p9pdu_readf(req->rc, c->proto_version, "w", &len);
544 if (err)
545 goto out_err;
546
547 ename = kmalloc(len + 1, GFP_NOFS);
548 if (!ename) {
549 err = -ENOMEM;
550 goto out_err;
551 }
552 if (len <= inline_len) {
553 /* We have error in protocol buffer itself */
554 if (pdu_read(req->rc, ename, len)) {
555 err = -EFAULT;
556 goto out_free;
557
558 }
559 } else {
560 /*
561 * Part of the data is in user space buffer.
562 */
563 if (pdu_read(req->rc, ename, inline_len)) {
564 err = -EFAULT;
565 goto out_free;
566
567 }
568 if (kern_buf) {
569 memcpy(ename + inline_len, uidata,
570 len - inline_len);
571 } else {
572 err = copy_from_user(ename + inline_len,
573 uidata, len - inline_len);
574 if (err) {
575 err = -EFAULT;
576 goto out_free;
577 }
578 }
579 }
580 ename[len] = 0;
581 if (p9_is_proto_dotu(c)) {
582 /* For dotu we also have error code */
583 err = p9pdu_readf(req->rc,
584 c->proto_version, "d", &ecode);
585 if (err)
586 goto out_free;
587 err = -ecode;
588 }
589 if (!err || !IS_ERR_VALUE(err)) {
590 err = p9_errstr2errno(ename, strlen(ename));
591
592 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
593 -ecode, ename);
594 }
595 kfree(ename);
596 } else {
597 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
598 err = -ecode;
599
600 P9_DPRINTK(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
601 }
602 return err;
603
604 out_free:
605 kfree(ename);
606 out_err:
607 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
608 return err;
609 }
610
611 static struct p9_req_t *
612 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
613
614 /**
615 * p9_client_flush - flush (cancel) a request
616 * @c: client state
617 * @oldreq: request to cancel
618 *
619 * This sents a flush for a particular request and links
620 * the flush request to the original request. The current
621 * code only supports a single flush request although the protocol
622 * allows for multiple flush requests to be sent for a single request.
623 *
624 */
625
626 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
627 {
628 struct p9_req_t *req;
629 int16_t oldtag;
630 int err;
631
632 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
633 if (err)
634 return err;
635
636 P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
637
638 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
639 if (IS_ERR(req))
640 return PTR_ERR(req);
641
642
643 /* if we haven't received a response for oldreq,
644 remove it from the list. */
645 spin_lock(&c->lock);
646 if (oldreq->status == REQ_STATUS_FLSH)
647 list_del(&oldreq->req_list);
648 spin_unlock(&c->lock);
649
650 p9_free_req(c, req);
651 return 0;
652 }
653
654 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
655 int8_t type, int req_size,
656 const char *fmt, va_list ap)
657 {
658 int tag, err;
659 struct p9_req_t *req;
660
661 P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
662
663 /* we allow for any status other than disconnected */
664 if (c->status == Disconnected)
665 return ERR_PTR(-EIO);
666
667 /* if status is begin_disconnected we allow only clunk request */
668 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
669 return ERR_PTR(-EIO);
670
671 tag = P9_NOTAG;
672 if (type != P9_TVERSION) {
673 tag = p9_idpool_get(c->tagpool);
674 if (tag < 0)
675 return ERR_PTR(-ENOMEM);
676 }
677
678 req = p9_tag_alloc(c, tag, req_size);
679 if (IS_ERR(req))
680 return req;
681
682 /* marshall the data */
683 p9pdu_prepare(req->tc, tag, type);
684 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
685 if (err)
686 goto reterr;
687 p9pdu_finalize(req->tc);
688 return req;
689 reterr:
690 p9_free_req(c, req);
691 return ERR_PTR(err);
692 }
693
694 /**
695 * p9_client_rpc - issue a request and wait for a response
696 * @c: client session
697 * @type: type of request
698 * @fmt: protocol format string (see protocol.c)
699 *
700 * Returns request structure (which client must free using p9_free_req)
701 */
702
703 static struct p9_req_t *
704 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
705 {
706 va_list ap;
707 int sigpending, err;
708 unsigned long flags;
709 struct p9_req_t *req;
710
711 va_start(ap, fmt);
712 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
713 va_end(ap);
714 if (IS_ERR(req))
715 return req;
716
717 if (signal_pending(current)) {
718 sigpending = 1;
719 clear_thread_flag(TIF_SIGPENDING);
720 } else
721 sigpending = 0;
722
723 err = c->trans_mod->request(c, req);
724 if (err < 0) {
725 if (err != -ERESTARTSYS && err != -EFAULT)
726 c->status = Disconnected;
727 goto reterr;
728 }
729 /* Wait for the response */
730 err = wait_event_interruptible(*req->wq,
731 req->status >= REQ_STATUS_RCVD);
732
733 if (req->status == REQ_STATUS_ERROR) {
734 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
735 err = req->t_err;
736 }
737 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
738 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
739 sigpending = 1;
740 clear_thread_flag(TIF_SIGPENDING);
741
742 if (c->trans_mod->cancel(c, req))
743 p9_client_flush(c, req);
744
745 /* if we received the response anyway, don't signal error */
746 if (req->status == REQ_STATUS_RCVD)
747 err = 0;
748 }
749 if (sigpending) {
750 spin_lock_irqsave(&current->sighand->siglock, flags);
751 recalc_sigpending();
752 spin_unlock_irqrestore(&current->sighand->siglock, flags);
753 }
754 if (err < 0)
755 goto reterr;
756
757 err = p9_check_errors(c, req);
758 if (!err) {
759 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
760 return req;
761 }
762 reterr:
763 P9_DPRINTK(P9_DEBUG_MUX,
764 "exit: client %p op %d error: %d\n", c, type, err);
765 p9_free_req(c, req);
766 return ERR_PTR(err);
767 }
768
769 /**
770 * p9_client_zc_rpc - issue a request and wait for a response
771 * @c: client session
772 * @type: type of request
773 * @uidata: user bffer that should be ued for zero copy read
774 * @uodata: user buffer that shoud be user for zero copy write
775 * @inlen: read buffer size
776 * @olen: write buffer size
777 * @hdrlen: reader header size, This is the size of response protocol data
778 * @fmt: protocol format string (see protocol.c)
779 *
780 * Returns request structure (which client must free using p9_free_req)
781 */
782 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
783 char *uidata, char *uodata,
784 int inlen, int olen, int in_hdrlen,
785 int kern_buf, const char *fmt, ...)
786 {
787 va_list ap;
788 int sigpending, err;
789 unsigned long flags;
790 struct p9_req_t *req;
791
792 va_start(ap, fmt);
793 /*
794 * We allocate a inline protocol data of only 4k bytes.
795 * The actual content is passed in zero-copy fashion.
796 */
797 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
798 va_end(ap);
799 if (IS_ERR(req))
800 return req;
801
802 if (signal_pending(current)) {
803 sigpending = 1;
804 clear_thread_flag(TIF_SIGPENDING);
805 } else
806 sigpending = 0;
807
808 /* If we are called with KERNEL_DS force kern_buf */
809 if (segment_eq(get_fs(), KERNEL_DS))
810 kern_buf = 1;
811
812 err = c->trans_mod->zc_request(c, req, uidata, uodata,
813 inlen, olen, in_hdrlen, kern_buf);
814 if (err < 0) {
815 if (err == -EIO)
816 c->status = Disconnected;
817 goto reterr;
818 }
819 if (req->status == REQ_STATUS_ERROR) {
820 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
821 err = req->t_err;
822 }
823 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
824 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
825 sigpending = 1;
826 clear_thread_flag(TIF_SIGPENDING);
827
828 if (c->trans_mod->cancel(c, req))
829 p9_client_flush(c, req);
830
831 /* if we received the response anyway, don't signal error */
832 if (req->status == REQ_STATUS_RCVD)
833 err = 0;
834 }
835 if (sigpending) {
836 spin_lock_irqsave(&current->sighand->siglock, flags);
837 recalc_sigpending();
838 spin_unlock_irqrestore(&current->sighand->siglock, flags);
839 }
840 if (err < 0)
841 goto reterr;
842
843 err = p9_check_zc_errors(c, req, uidata, in_hdrlen, kern_buf);
844 if (!err) {
845 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
846 return req;
847 }
848 reterr:
849 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
850 err);
851 p9_free_req(c, req);
852 return ERR_PTR(err);
853 }
854
855 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
856 {
857 int ret;
858 struct p9_fid *fid;
859 unsigned long flags;
860
861 P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
862 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
863 if (!fid)
864 return ERR_PTR(-ENOMEM);
865
866 ret = p9_idpool_get(clnt->fidpool);
867 if (ret < 0) {
868 ret = -ENOSPC;
869 goto error;
870 }
871 fid->fid = ret;
872
873 memset(&fid->qid, 0, sizeof(struct p9_qid));
874 fid->mode = -1;
875 fid->uid = current_fsuid();
876 fid->clnt = clnt;
877 fid->rdir = NULL;
878 spin_lock_irqsave(&clnt->lock, flags);
879 list_add(&fid->flist, &clnt->fidlist);
880 spin_unlock_irqrestore(&clnt->lock, flags);
881
882 return fid;
883
884 error:
885 kfree(fid);
886 return ERR_PTR(ret);
887 }
888
889 static void p9_fid_destroy(struct p9_fid *fid)
890 {
891 struct p9_client *clnt;
892 unsigned long flags;
893
894 P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
895 clnt = fid->clnt;
896 p9_idpool_put(fid->fid, clnt->fidpool);
897 spin_lock_irqsave(&clnt->lock, flags);
898 list_del(&fid->flist);
899 spin_unlock_irqrestore(&clnt->lock, flags);
900 kfree(fid->rdir);
901 kfree(fid);
902 }
903
904 static int p9_client_version(struct p9_client *c)
905 {
906 int err = 0;
907 struct p9_req_t *req;
908 char *version;
909 int msize;
910
911 P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
912 c->msize, c->proto_version);
913
914 switch (c->proto_version) {
915 case p9_proto_2000L:
916 req = p9_client_rpc(c, P9_TVERSION, "ds",
917 c->msize, "9P2000.L");
918 break;
919 case p9_proto_2000u:
920 req = p9_client_rpc(c, P9_TVERSION, "ds",
921 c->msize, "9P2000.u");
922 break;
923 case p9_proto_legacy:
924 req = p9_client_rpc(c, P9_TVERSION, "ds",
925 c->msize, "9P2000");
926 break;
927 default:
928 return -EINVAL;
929 break;
930 }
931
932 if (IS_ERR(req))
933 return PTR_ERR(req);
934
935 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
936 if (err) {
937 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
938 P9_DUMP_PKT(1, req->rc);
939 goto error;
940 }
941
942 P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
943 if (!strncmp(version, "9P2000.L", 8))
944 c->proto_version = p9_proto_2000L;
945 else if (!strncmp(version, "9P2000.u", 8))
946 c->proto_version = p9_proto_2000u;
947 else if (!strncmp(version, "9P2000", 6))
948 c->proto_version = p9_proto_legacy;
949 else {
950 err = -EREMOTEIO;
951 goto error;
952 }
953
954 if (msize < c->msize)
955 c->msize = msize;
956
957 error:
958 kfree(version);
959 p9_free_req(c, req);
960
961 return err;
962 }
963
964 struct p9_client *p9_client_create(const char *dev_name, char *options)
965 {
966 int err;
967 struct p9_client *clnt;
968
969 err = 0;
970 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
971 if (!clnt)
972 return ERR_PTR(-ENOMEM);
973
974 clnt->trans_mod = NULL;
975 clnt->trans = NULL;
976 spin_lock_init(&clnt->lock);
977 INIT_LIST_HEAD(&clnt->fidlist);
978
979 err = p9_tag_init(clnt);
980 if (err < 0)
981 goto free_client;
982
983 err = parse_opts(options, clnt);
984 if (err < 0)
985 goto destroy_tagpool;
986
987 if (!clnt->trans_mod)
988 clnt->trans_mod = v9fs_get_default_trans();
989
990 if (clnt->trans_mod == NULL) {
991 err = -EPROTONOSUPPORT;
992 P9_DPRINTK(P9_DEBUG_ERROR,
993 "No transport defined or default transport\n");
994 goto destroy_tagpool;
995 }
996
997 clnt->fidpool = p9_idpool_create();
998 if (IS_ERR(clnt->fidpool)) {
999 err = PTR_ERR(clnt->fidpool);
1000 goto put_trans;
1001 }
1002
1003 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1004 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1005
1006 err = clnt->trans_mod->create(clnt, dev_name, options);
1007 if (err)
1008 goto destroy_fidpool;
1009
1010 if (clnt->msize > clnt->trans_mod->maxsize)
1011 clnt->msize = clnt->trans_mod->maxsize;
1012
1013 err = p9_client_version(clnt);
1014 if (err)
1015 goto close_trans;
1016
1017 return clnt;
1018
1019 close_trans:
1020 clnt->trans_mod->close(clnt);
1021 destroy_fidpool:
1022 p9_idpool_destroy(clnt->fidpool);
1023 put_trans:
1024 v9fs_put_trans(clnt->trans_mod);
1025 destroy_tagpool:
1026 p9_idpool_destroy(clnt->tagpool);
1027 free_client:
1028 kfree(clnt);
1029 return ERR_PTR(err);
1030 }
1031 EXPORT_SYMBOL(p9_client_create);
1032
1033 void p9_client_destroy(struct p9_client *clnt)
1034 {
1035 struct p9_fid *fid, *fidptr;
1036
1037 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt);
1038
1039 if (clnt->trans_mod)
1040 clnt->trans_mod->close(clnt);
1041
1042 v9fs_put_trans(clnt->trans_mod);
1043
1044 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
1045 printk(KERN_INFO "Found fid %d not clunked\n", fid->fid);
1046 p9_fid_destroy(fid);
1047 }
1048
1049 if (clnt->fidpool)
1050 p9_idpool_destroy(clnt->fidpool);
1051
1052 p9_tag_cleanup(clnt);
1053
1054 kfree(clnt);
1055 }
1056 EXPORT_SYMBOL(p9_client_destroy);
1057
1058 void p9_client_disconnect(struct p9_client *clnt)
1059 {
1060 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
1061 clnt->status = Disconnected;
1062 }
1063 EXPORT_SYMBOL(p9_client_disconnect);
1064
1065 void p9_client_begin_disconnect(struct p9_client *clnt)
1066 {
1067 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
1068 clnt->status = BeginDisconnect;
1069 }
1070 EXPORT_SYMBOL(p9_client_begin_disconnect);
1071
1072 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1073 char *uname, u32 n_uname, char *aname)
1074 {
1075 int err;
1076 struct p9_req_t *req;
1077 struct p9_fid *fid;
1078 struct p9_qid qid;
1079
1080 P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1081 afid ? afid->fid : -1, uname, aname);
1082 err = 0;
1083
1084 fid = p9_fid_create(clnt);
1085 if (IS_ERR(fid)) {
1086 err = PTR_ERR(fid);
1087 fid = NULL;
1088 goto error;
1089 }
1090
1091 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
1092 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1093 if (IS_ERR(req)) {
1094 err = PTR_ERR(req);
1095 goto error;
1096 }
1097
1098 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
1099 if (err) {
1100 P9_DUMP_PKT(1, req->rc);
1101 p9_free_req(clnt, req);
1102 goto error;
1103 }
1104
1105 P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1106 qid.type,
1107 (unsigned long long)qid.path,
1108 qid.version);
1109
1110 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1111
1112 p9_free_req(clnt, req);
1113 return fid;
1114
1115 error:
1116 if (fid)
1117 p9_fid_destroy(fid);
1118 return ERR_PTR(err);
1119 }
1120 EXPORT_SYMBOL(p9_client_attach);
1121
1122 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1123 char **wnames, int clone)
1124 {
1125 int err;
1126 struct p9_client *clnt;
1127 struct p9_fid *fid;
1128 struct p9_qid *wqids;
1129 struct p9_req_t *req;
1130 uint16_t nwqids, count;
1131
1132 err = 0;
1133 wqids = NULL;
1134 clnt = oldfid->clnt;
1135 if (clone) {
1136 fid = p9_fid_create(clnt);
1137 if (IS_ERR(fid)) {
1138 err = PTR_ERR(fid);
1139 fid = NULL;
1140 goto error;
1141 }
1142
1143 fid->uid = oldfid->uid;
1144 } else
1145 fid = oldfid;
1146
1147
1148 P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1149 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1150
1151 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1152 nwname, wnames);
1153 if (IS_ERR(req)) {
1154 err = PTR_ERR(req);
1155 goto error;
1156 }
1157
1158 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1159 if (err) {
1160 P9_DUMP_PKT(1, req->rc);
1161 p9_free_req(clnt, req);
1162 goto clunk_fid;
1163 }
1164 p9_free_req(clnt, req);
1165
1166 P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1167
1168 if (nwqids != nwname) {
1169 err = -ENOENT;
1170 goto clunk_fid;
1171 }
1172
1173 for (count = 0; count < nwqids; count++)
1174 P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1175 count, wqids[count].type,
1176 (unsigned long long)wqids[count].path,
1177 wqids[count].version);
1178
1179 if (nwname)
1180 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1181 else
1182 fid->qid = oldfid->qid;
1183
1184 kfree(wqids);
1185 return fid;
1186
1187 clunk_fid:
1188 kfree(wqids);
1189 p9_client_clunk(fid);
1190 fid = NULL;
1191
1192 error:
1193 if (fid && (fid != oldfid))
1194 p9_fid_destroy(fid);
1195
1196 return ERR_PTR(err);
1197 }
1198 EXPORT_SYMBOL(p9_client_walk);
1199
1200 int p9_client_open(struct p9_fid *fid, int mode)
1201 {
1202 int err;
1203 struct p9_client *clnt;
1204 struct p9_req_t *req;
1205 struct p9_qid qid;
1206 int iounit;
1207
1208 clnt = fid->clnt;
1209 P9_DPRINTK(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1210 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1211 err = 0;
1212
1213 if (fid->mode != -1)
1214 return -EINVAL;
1215
1216 if (p9_is_proto_dotl(clnt))
1217 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1218 else
1219 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1220 if (IS_ERR(req)) {
1221 err = PTR_ERR(req);
1222 goto error;
1223 }
1224
1225 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1226 if (err) {
1227 P9_DUMP_PKT(1, req->rc);
1228 goto free_and_error;
1229 }
1230
1231 P9_DPRINTK(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1232 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1233 (unsigned long long)qid.path, qid.version, iounit);
1234
1235 fid->mode = mode;
1236 fid->iounit = iounit;
1237
1238 free_and_error:
1239 p9_free_req(clnt, req);
1240 error:
1241 return err;
1242 }
1243 EXPORT_SYMBOL(p9_client_open);
1244
1245 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1246 gid_t gid, struct p9_qid *qid)
1247 {
1248 int err = 0;
1249 struct p9_client *clnt;
1250 struct p9_req_t *req;
1251 int iounit;
1252
1253 P9_DPRINTK(P9_DEBUG_9P,
1254 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1255 ofid->fid, name, flags, mode, gid);
1256 clnt = ofid->clnt;
1257
1258 if (ofid->mode != -1)
1259 return -EINVAL;
1260
1261 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags,
1262 mode, gid);
1263 if (IS_ERR(req)) {
1264 err = PTR_ERR(req);
1265 goto error;
1266 }
1267
1268 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1269 if (err) {
1270 P9_DUMP_PKT(1, req->rc);
1271 goto free_and_error;
1272 }
1273
1274 P9_DPRINTK(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1275 qid->type,
1276 (unsigned long long)qid->path,
1277 qid->version, iounit);
1278
1279 ofid->mode = mode;
1280 ofid->iounit = iounit;
1281
1282 free_and_error:
1283 p9_free_req(clnt, req);
1284 error:
1285 return err;
1286 }
1287 EXPORT_SYMBOL(p9_client_create_dotl);
1288
1289 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1290 char *extension)
1291 {
1292 int err;
1293 struct p9_client *clnt;
1294 struct p9_req_t *req;
1295 struct p9_qid qid;
1296 int iounit;
1297
1298 P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1299 fid->fid, name, perm, mode);
1300 err = 0;
1301 clnt = fid->clnt;
1302
1303 if (fid->mode != -1)
1304 return -EINVAL;
1305
1306 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1307 mode, extension);
1308 if (IS_ERR(req)) {
1309 err = PTR_ERR(req);
1310 goto error;
1311 }
1312
1313 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1314 if (err) {
1315 P9_DUMP_PKT(1, req->rc);
1316 goto free_and_error;
1317 }
1318
1319 P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1320 qid.type,
1321 (unsigned long long)qid.path,
1322 qid.version, iounit);
1323
1324 fid->mode = mode;
1325 fid->iounit = iounit;
1326
1327 free_and_error:
1328 p9_free_req(clnt, req);
1329 error:
1330 return err;
1331 }
1332 EXPORT_SYMBOL(p9_client_fcreate);
1333
1334 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid,
1335 struct p9_qid *qid)
1336 {
1337 int err = 0;
1338 struct p9_client *clnt;
1339 struct p9_req_t *req;
1340
1341 P9_DPRINTK(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1342 dfid->fid, name, symtgt);
1343 clnt = dfid->clnt;
1344
1345 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt,
1346 gid);
1347 if (IS_ERR(req)) {
1348 err = PTR_ERR(req);
1349 goto error;
1350 }
1351
1352 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1353 if (err) {
1354 P9_DUMP_PKT(1, req->rc);
1355 goto free_and_error;
1356 }
1357
1358 P9_DPRINTK(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1359 qid->type, (unsigned long long)qid->path, qid->version);
1360
1361 free_and_error:
1362 p9_free_req(clnt, req);
1363 error:
1364 return err;
1365 }
1366 EXPORT_SYMBOL(p9_client_symlink);
1367
1368 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1369 {
1370 struct p9_client *clnt;
1371 struct p9_req_t *req;
1372
1373 P9_DPRINTK(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1374 dfid->fid, oldfid->fid, newname);
1375 clnt = dfid->clnt;
1376 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1377 newname);
1378 if (IS_ERR(req))
1379 return PTR_ERR(req);
1380
1381 P9_DPRINTK(P9_DEBUG_9P, "<<< RLINK\n");
1382 p9_free_req(clnt, req);
1383 return 0;
1384 }
1385 EXPORT_SYMBOL(p9_client_link);
1386
1387 int p9_client_fsync(struct p9_fid *fid, int datasync)
1388 {
1389 int err;
1390 struct p9_client *clnt;
1391 struct p9_req_t *req;
1392
1393 P9_DPRINTK(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1394 fid->fid, datasync);
1395 err = 0;
1396 clnt = fid->clnt;
1397
1398 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1399 if (IS_ERR(req)) {
1400 err = PTR_ERR(req);
1401 goto error;
1402 }
1403
1404 P9_DPRINTK(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1405
1406 p9_free_req(clnt, req);
1407
1408 error:
1409 return err;
1410 }
1411 EXPORT_SYMBOL(p9_client_fsync);
1412
1413 int p9_client_clunk(struct p9_fid *fid)
1414 {
1415 int err;
1416 struct p9_client *clnt;
1417 struct p9_req_t *req;
1418
1419 if (!fid) {
1420 P9_EPRINTK(KERN_WARNING, "Trying to clunk with NULL fid\n");
1421 dump_stack();
1422 return 0;
1423 }
1424
1425 P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
1426 err = 0;
1427 clnt = fid->clnt;
1428
1429 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1430 if (IS_ERR(req)) {
1431 err = PTR_ERR(req);
1432 goto error;
1433 }
1434
1435 P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1436
1437 p9_free_req(clnt, req);
1438 error:
1439 /*
1440 * Fid is not valid even after a failed clunk
1441 */
1442 p9_fid_destroy(fid);
1443 return err;
1444 }
1445 EXPORT_SYMBOL(p9_client_clunk);
1446
1447 int p9_client_remove(struct p9_fid *fid)
1448 {
1449 int err;
1450 struct p9_client *clnt;
1451 struct p9_req_t *req;
1452
1453 P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1454 err = 0;
1455 clnt = fid->clnt;
1456
1457 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1458 if (IS_ERR(req)) {
1459 err = PTR_ERR(req);
1460 goto error;
1461 }
1462
1463 P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1464
1465 p9_free_req(clnt, req);
1466 error:
1467 p9_fid_destroy(fid);
1468 return err;
1469 }
1470 EXPORT_SYMBOL(p9_client_remove);
1471
1472 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1473 {
1474 int err = 0;
1475 struct p9_req_t *req;
1476 struct p9_client *clnt;
1477
1478 P9_DPRINTK(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1479 dfid->fid, name, flags);
1480
1481 clnt = dfid->clnt;
1482 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1483 if (IS_ERR(req)) {
1484 err = PTR_ERR(req);
1485 goto error;
1486 }
1487 P9_DPRINTK(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1488
1489 p9_free_req(clnt, req);
1490 error:
1491 return err;
1492 }
1493 EXPORT_SYMBOL(p9_client_unlinkat);
1494
1495 int
1496 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1497 u32 count)
1498 {
1499 char *dataptr;
1500 int kernel_buf = 0;
1501 struct p9_req_t *req;
1502 struct p9_client *clnt;
1503 int err, rsize, non_zc = 0;
1504
1505
1506 P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1507 fid->fid, (long long unsigned) offset, count);
1508 err = 0;
1509 clnt = fid->clnt;
1510
1511 rsize = fid->iounit;
1512 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1513 rsize = clnt->msize - P9_IOHDRSZ;
1514
1515 if (count < rsize)
1516 rsize = count;
1517
1518 /* Don't bother zerocopy for small IO (< 1024) */
1519 if (clnt->trans_mod->zc_request && rsize > 1024) {
1520 char *indata;
1521 if (data) {
1522 kernel_buf = 1;
1523 indata = data;
1524 } else
1525 indata = (char *)udata;
1526 /*
1527 * response header len is 11
1528 * PDU Header(7) + IO Size (4)
1529 */
1530 req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0,
1531 11, kernel_buf, "dqd", fid->fid,
1532 offset, rsize);
1533 } else {
1534 non_zc = 1;
1535 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1536 rsize);
1537 }
1538 if (IS_ERR(req)) {
1539 err = PTR_ERR(req);
1540 goto error;
1541 }
1542
1543 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1544 if (err) {
1545 P9_DUMP_PKT(1, req->rc);
1546 goto free_and_error;
1547 }
1548
1549 P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1550 P9_DUMP_PKT(1, req->rc);
1551
1552 if (non_zc) {
1553 if (data) {
1554 memmove(data, dataptr, count);
1555 } else {
1556 err = copy_to_user(udata, dataptr, count);
1557 if (err) {
1558 err = -EFAULT;
1559 goto free_and_error;
1560 }
1561 }
1562 }
1563 p9_free_req(clnt, req);
1564 return count;
1565
1566 free_and_error:
1567 p9_free_req(clnt, req);
1568 error:
1569 return err;
1570 }
1571 EXPORT_SYMBOL(p9_client_read);
1572
1573 int
1574 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1575 u64 offset, u32 count)
1576 {
1577 int err, rsize;
1578 int kernel_buf = 0;
1579 struct p9_client *clnt;
1580 struct p9_req_t *req;
1581
1582 P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1583 fid->fid, (long long unsigned) offset, count);
1584 err = 0;
1585 clnt = fid->clnt;
1586
1587 rsize = fid->iounit;
1588 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1589 rsize = clnt->msize - P9_IOHDRSZ;
1590
1591 if (count < rsize)
1592 rsize = count;
1593
1594 /* Don't bother zerocopy for small IO (< 1024) */
1595 if (clnt->trans_mod->zc_request && rsize > 1024) {
1596 char *odata;
1597 if (data) {
1598 kernel_buf = 1;
1599 odata = data;
1600 } else
1601 odata = (char *)udata;
1602 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize,
1603 P9_ZC_HDR_SZ, kernel_buf, "dqd",
1604 fid->fid, offset, rsize);
1605 } else {
1606 if (data)
1607 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
1608 offset, rsize, data);
1609 else
1610 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
1611 offset, rsize, udata);
1612 }
1613 if (IS_ERR(req)) {
1614 err = PTR_ERR(req);
1615 goto error;
1616 }
1617
1618 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1619 if (err) {
1620 P9_DUMP_PKT(1, req->rc);
1621 goto free_and_error;
1622 }
1623
1624 P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1625
1626 p9_free_req(clnt, req);
1627 return count;
1628
1629 free_and_error:
1630 p9_free_req(clnt, req);
1631 error:
1632 return err;
1633 }
1634 EXPORT_SYMBOL(p9_client_write);
1635
1636 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1637 {
1638 int err;
1639 struct p9_client *clnt;
1640 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1641 struct p9_req_t *req;
1642 u16 ignored;
1643
1644 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1645
1646 if (!ret)
1647 return ERR_PTR(-ENOMEM);
1648
1649 err = 0;
1650 clnt = fid->clnt;
1651
1652 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1653 if (IS_ERR(req)) {
1654 err = PTR_ERR(req);
1655 goto error;
1656 }
1657
1658 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1659 if (err) {
1660 P9_DUMP_PKT(1, req->rc);
1661 p9_free_req(clnt, req);
1662 goto error;
1663 }
1664
1665 P9_DPRINTK(P9_DEBUG_9P,
1666 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1667 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1668 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1669 "<<< uid=%d gid=%d n_muid=%d\n",
1670 ret->size, ret->type, ret->dev, ret->qid.type,
1671 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1672 ret->atime, ret->mtime, (unsigned long long)ret->length,
1673 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1674 ret->n_uid, ret->n_gid, ret->n_muid);
1675
1676 p9_free_req(clnt, req);
1677 return ret;
1678
1679 error:
1680 kfree(ret);
1681 return ERR_PTR(err);
1682 }
1683 EXPORT_SYMBOL(p9_client_stat);
1684
1685 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1686 u64 request_mask)
1687 {
1688 int err;
1689 struct p9_client *clnt;
1690 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1691 GFP_KERNEL);
1692 struct p9_req_t *req;
1693
1694 P9_DPRINTK(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1695 fid->fid, request_mask);
1696
1697 if (!ret)
1698 return ERR_PTR(-ENOMEM);
1699
1700 err = 0;
1701 clnt = fid->clnt;
1702
1703 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1704 if (IS_ERR(req)) {
1705 err = PTR_ERR(req);
1706 goto error;
1707 }
1708
1709 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1710 if (err) {
1711 P9_DUMP_PKT(1, req->rc);
1712 p9_free_req(clnt, req);
1713 goto error;
1714 }
1715
1716 P9_DPRINTK(P9_DEBUG_9P,
1717 "<<< RGETATTR st_result_mask=%lld\n"
1718 "<<< qid=%x.%llx.%x\n"
1719 "<<< st_mode=%8.8x st_nlink=%llu\n"
1720 "<<< st_uid=%d st_gid=%d\n"
1721 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1722 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1723 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1724 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1725 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1726 "<<< st_gen=%lld st_data_version=%lld",
1727 ret->st_result_mask, ret->qid.type, ret->qid.path,
1728 ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid,
1729 ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize,
1730 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1731 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1732 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1733 ret->st_gen, ret->st_data_version);
1734
1735 p9_free_req(clnt, req);
1736 return ret;
1737
1738 error:
1739 kfree(ret);
1740 return ERR_PTR(err);
1741 }
1742 EXPORT_SYMBOL(p9_client_getattr_dotl);
1743
1744 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1745 {
1746 int ret;
1747
1748 /* NOTE: size shouldn't include its own length */
1749 /* size[2] type[2] dev[4] qid[13] */
1750 /* mode[4] atime[4] mtime[4] length[8]*/
1751 /* name[s] uid[s] gid[s] muid[s] */
1752 ret = 2+4+13+4+4+4+8+2+2+2+2;
1753
1754 if (wst->name)
1755 ret += strlen(wst->name);
1756 if (wst->uid)
1757 ret += strlen(wst->uid);
1758 if (wst->gid)
1759 ret += strlen(wst->gid);
1760 if (wst->muid)
1761 ret += strlen(wst->muid);
1762
1763 if ((proto_version == p9_proto_2000u) ||
1764 (proto_version == p9_proto_2000L)) {
1765 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1766 if (wst->extension)
1767 ret += strlen(wst->extension);
1768 }
1769
1770 return ret;
1771 }
1772
1773 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1774 {
1775 int err;
1776 struct p9_req_t *req;
1777 struct p9_client *clnt;
1778
1779 err = 0;
1780 clnt = fid->clnt;
1781 wst->size = p9_client_statsize(wst, clnt->proto_version);
1782 P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1783 P9_DPRINTK(P9_DEBUG_9P,
1784 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1785 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1786 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1787 " uid=%d gid=%d n_muid=%d\n",
1788 wst->size, wst->type, wst->dev, wst->qid.type,
1789 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1790 wst->atime, wst->mtime, (unsigned long long)wst->length,
1791 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1792 wst->n_uid, wst->n_gid, wst->n_muid);
1793
1794 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1795 if (IS_ERR(req)) {
1796 err = PTR_ERR(req);
1797 goto error;
1798 }
1799
1800 P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1801
1802 p9_free_req(clnt, req);
1803 error:
1804 return err;
1805 }
1806 EXPORT_SYMBOL(p9_client_wstat);
1807
1808 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1809 {
1810 int err;
1811 struct p9_req_t *req;
1812 struct p9_client *clnt;
1813
1814 err = 0;
1815 clnt = fid->clnt;
1816 P9_DPRINTK(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1817 P9_DPRINTK(P9_DEBUG_9P,
1818 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1819 " atime_sec=%lld atime_nsec=%lld\n"
1820 " mtime_sec=%lld mtime_nsec=%lld\n",
1821 p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid,
1822 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1823 p9attr->mtime_sec, p9attr->mtime_nsec);
1824
1825 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1826
1827 if (IS_ERR(req)) {
1828 err = PTR_ERR(req);
1829 goto error;
1830 }
1831 P9_DPRINTK(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1832 p9_free_req(clnt, req);
1833 error:
1834 return err;
1835 }
1836 EXPORT_SYMBOL(p9_client_setattr);
1837
1838 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1839 {
1840 int err;
1841 struct p9_req_t *req;
1842 struct p9_client *clnt;
1843
1844 err = 0;
1845 clnt = fid->clnt;
1846
1847 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1848
1849 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1850 if (IS_ERR(req)) {
1851 err = PTR_ERR(req);
1852 goto error;
1853 }
1854
1855 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1856 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1857 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1858 if (err) {
1859 P9_DUMP_PKT(1, req->rc);
1860 p9_free_req(clnt, req);
1861 goto error;
1862 }
1863
1864 P9_DPRINTK(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1865 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1866 "fsid %llu namelen %ld\n",
1867 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1868 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1869 sb->fsid, (long int)sb->namelen);
1870
1871 p9_free_req(clnt, req);
1872 error:
1873 return err;
1874 }
1875 EXPORT_SYMBOL(p9_client_statfs);
1876
1877 int p9_client_rename(struct p9_fid *fid,
1878 struct p9_fid *newdirfid, const char *name)
1879 {
1880 int err;
1881 struct p9_req_t *req;
1882 struct p9_client *clnt;
1883
1884 err = 0;
1885 clnt = fid->clnt;
1886
1887 P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1888 fid->fid, newdirfid->fid, name);
1889
1890 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1891 newdirfid->fid, name);
1892 if (IS_ERR(req)) {
1893 err = PTR_ERR(req);
1894 goto error;
1895 }
1896
1897 P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1898
1899 p9_free_req(clnt, req);
1900 error:
1901 return err;
1902 }
1903 EXPORT_SYMBOL(p9_client_rename);
1904
1905 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1906 struct p9_fid *newdirfid, const char *new_name)
1907 {
1908 int err;
1909 struct p9_req_t *req;
1910 struct p9_client *clnt;
1911
1912 err = 0;
1913 clnt = olddirfid->clnt;
1914
1915 P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1916 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1917 newdirfid->fid, new_name);
1918
1919 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1920 old_name, newdirfid->fid, new_name);
1921 if (IS_ERR(req)) {
1922 err = PTR_ERR(req);
1923 goto error;
1924 }
1925
1926 P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1927 newdirfid->fid, new_name);
1928
1929 p9_free_req(clnt, req);
1930 error:
1931 return err;
1932 }
1933 EXPORT_SYMBOL(p9_client_renameat);
1934
1935 /*
1936 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1937 */
1938 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1939 const char *attr_name, u64 *attr_size)
1940 {
1941 int err;
1942 struct p9_req_t *req;
1943 struct p9_client *clnt;
1944 struct p9_fid *attr_fid;
1945
1946 err = 0;
1947 clnt = file_fid->clnt;
1948 attr_fid = p9_fid_create(clnt);
1949 if (IS_ERR(attr_fid)) {
1950 err = PTR_ERR(attr_fid);
1951 attr_fid = NULL;
1952 goto error;
1953 }
1954 P9_DPRINTK(P9_DEBUG_9P,
1955 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
1956 file_fid->fid, attr_fid->fid, attr_name);
1957
1958 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
1959 file_fid->fid, attr_fid->fid, attr_name);
1960 if (IS_ERR(req)) {
1961 err = PTR_ERR(req);
1962 goto error;
1963 }
1964 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
1965 if (err) {
1966 P9_DUMP_PKT(1, req->rc);
1967 p9_free_req(clnt, req);
1968 goto clunk_fid;
1969 }
1970 p9_free_req(clnt, req);
1971 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
1972 attr_fid->fid, *attr_size);
1973 return attr_fid;
1974 clunk_fid:
1975 p9_client_clunk(attr_fid);
1976 attr_fid = NULL;
1977 error:
1978 if (attr_fid && (attr_fid != file_fid))
1979 p9_fid_destroy(attr_fid);
1980
1981 return ERR_PTR(err);
1982 }
1983 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
1984
1985 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
1986 u64 attr_size, int flags)
1987 {
1988 int err;
1989 struct p9_req_t *req;
1990 struct p9_client *clnt;
1991
1992 P9_DPRINTK(P9_DEBUG_9P,
1993 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
1994 fid->fid, name, (long long)attr_size, flags);
1995 err = 0;
1996 clnt = fid->clnt;
1997 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
1998 fid->fid, name, attr_size, flags);
1999 if (IS_ERR(req)) {
2000 err = PTR_ERR(req);
2001 goto error;
2002 }
2003 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2004 p9_free_req(clnt, req);
2005 error:
2006 return err;
2007 }
2008 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2009
2010 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2011 {
2012 int err, rsize, non_zc = 0;
2013 struct p9_client *clnt;
2014 struct p9_req_t *req;
2015 char *dataptr;
2016
2017 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2018 fid->fid, (long long unsigned) offset, count);
2019
2020 err = 0;
2021 clnt = fid->clnt;
2022
2023 rsize = fid->iounit;
2024 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2025 rsize = clnt->msize - P9_READDIRHDRSZ;
2026
2027 if (count < rsize)
2028 rsize = count;
2029
2030 /* Don't bother zerocopy for small IO (< 1024) */
2031 if (clnt->trans_mod->zc_request && rsize > 1024) {
2032 /*
2033 * response header len is 11
2034 * PDU Header(7) + IO Size (4)
2035 */
2036 req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0,
2037 11, 1, "dqd", fid->fid, offset, rsize);
2038 } else {
2039 non_zc = 1;
2040 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2041 offset, rsize);
2042 }
2043 if (IS_ERR(req)) {
2044 err = PTR_ERR(req);
2045 goto error;
2046 }
2047
2048 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2049 if (err) {
2050 P9_DUMP_PKT(1, req->rc);
2051 goto free_and_error;
2052 }
2053
2054 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2055
2056 if (non_zc)
2057 memmove(data, dataptr, count);
2058
2059 p9_free_req(clnt, req);
2060 return count;
2061
2062 free_and_error:
2063 p9_free_req(clnt, req);
2064 error:
2065 return err;
2066 }
2067 EXPORT_SYMBOL(p9_client_readdir);
2068
2069 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
2070 dev_t rdev, gid_t gid, struct p9_qid *qid)
2071 {
2072 int err;
2073 struct p9_client *clnt;
2074 struct p9_req_t *req;
2075
2076 err = 0;
2077 clnt = fid->clnt;
2078 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2079 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2080 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode,
2081 MAJOR(rdev), MINOR(rdev), gid);
2082 if (IS_ERR(req))
2083 return PTR_ERR(req);
2084
2085 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2086 if (err) {
2087 P9_DUMP_PKT(1, req->rc);
2088 goto error;
2089 }
2090 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2091 (unsigned long long)qid->path, qid->version);
2092
2093 error:
2094 p9_free_req(clnt, req);
2095 return err;
2096
2097 }
2098 EXPORT_SYMBOL(p9_client_mknod_dotl);
2099
2100 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
2101 gid_t gid, struct p9_qid *qid)
2102 {
2103 int err;
2104 struct p9_client *clnt;
2105 struct p9_req_t *req;
2106
2107 err = 0;
2108 clnt = fid->clnt;
2109 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2110 fid->fid, name, mode, gid);
2111 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode,
2112 gid);
2113 if (IS_ERR(req))
2114 return PTR_ERR(req);
2115
2116 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2117 if (err) {
2118 P9_DUMP_PKT(1, req->rc);
2119 goto error;
2120 }
2121 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2122 (unsigned long long)qid->path, qid->version);
2123
2124 error:
2125 p9_free_req(clnt, req);
2126 return err;
2127
2128 }
2129 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2130
2131 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2132 {
2133 int err;
2134 struct p9_client *clnt;
2135 struct p9_req_t *req;
2136
2137 err = 0;
2138 clnt = fid->clnt;
2139 P9_DPRINTK(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2140 "start %lld length %lld proc_id %d client_id %s\n",
2141 fid->fid, flock->type, flock->flags, flock->start,
2142 flock->length, flock->proc_id, flock->client_id);
2143
2144 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2145 flock->flags, flock->start, flock->length,
2146 flock->proc_id, flock->client_id);
2147
2148 if (IS_ERR(req))
2149 return PTR_ERR(req);
2150
2151 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2152 if (err) {
2153 P9_DUMP_PKT(1, req->rc);
2154 goto error;
2155 }
2156 P9_DPRINTK(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2157 error:
2158 p9_free_req(clnt, req);
2159 return err;
2160
2161 }
2162 EXPORT_SYMBOL(p9_client_lock_dotl);
2163
2164 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2165 {
2166 int err;
2167 struct p9_client *clnt;
2168 struct p9_req_t *req;
2169
2170 err = 0;
2171 clnt = fid->clnt;
2172 P9_DPRINTK(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2173 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2174 glock->start, glock->length, glock->proc_id, glock->client_id);
2175
2176 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2177 glock->start, glock->length, glock->proc_id, glock->client_id);
2178
2179 if (IS_ERR(req))
2180 return PTR_ERR(req);
2181
2182 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2183 &glock->start, &glock->length, &glock->proc_id,
2184 &glock->client_id);
2185 if (err) {
2186 P9_DUMP_PKT(1, req->rc);
2187 goto error;
2188 }
2189 P9_DPRINTK(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2190 "proc_id %d client_id %s\n", glock->type, glock->start,
2191 glock->length, glock->proc_id, glock->client_id);
2192 error:
2193 p9_free_req(clnt, req);
2194 return err;
2195 }
2196 EXPORT_SYMBOL(p9_client_getlock_dotl);
2197
2198 int p9_client_readlink(struct p9_fid *fid, char **target)
2199 {
2200 int err;
2201 struct p9_client *clnt;
2202 struct p9_req_t *req;
2203
2204 err = 0;
2205 clnt = fid->clnt;
2206 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2207
2208 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2209 if (IS_ERR(req))
2210 return PTR_ERR(req);
2211
2212 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2213 if (err) {
2214 P9_DUMP_PKT(1, req->rc);
2215 goto error;
2216 }
2217 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2218 error:
2219 p9_free_req(clnt, req);
2220 return err;
2221 }
2222 EXPORT_SYMBOL(p9_client_readlink);
Linux kernel - Deliverables
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