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mmc: sdhci-esdhc: Change delay after setting clock from 100ms to 1ms
[linux-2.6.git] / net / 9p / client.c
blob854ca7a911c427f753ebe2b5d93a71a1c10df041
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 #define CREATE_TRACE_POINTS
42 #include <trace/events/9p.h>
43
44 /*
45 * Client Option Parsing (code inspired by NFS code)
46 * - a little lazy - parse all client options
47 */
48
49 enum {
50 Opt_msize,
51 Opt_trans,
52 Opt_legacy,
53 Opt_version,
54 Opt_err,
55 };
56
57 static const match_table_t tokens = {
58 {Opt_msize, "msize=%u"},
59 {Opt_legacy, "noextend"},
60 {Opt_trans, "trans=%s"},
61 {Opt_version, "version=%s"},
62 {Opt_err, NULL},
63 };
64
65 inline int p9_is_proto_dotl(struct p9_client *clnt)
66 {
67 return clnt->proto_version == p9_proto_2000L;
68 }
69 EXPORT_SYMBOL(p9_is_proto_dotl);
70
71 inline int p9_is_proto_dotu(struct p9_client *clnt)
72 {
73 return clnt->proto_version == p9_proto_2000u;
74 }
75 EXPORT_SYMBOL(p9_is_proto_dotu);
76
77 /* Interpret mount option for protocol version */
78 static int get_protocol_version(char *s)
79 {
80 int version = -EINVAL;
81
82 if (!strcmp(s, "9p2000")) {
83 version = p9_proto_legacy;
84 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: Legacy\n");
85 } else if (!strcmp(s, "9p2000.u")) {
86 version = p9_proto_2000u;
87 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
88 } else if (!strcmp(s, "9p2000.L")) {
89 version = p9_proto_2000L;
90 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
91 } else
92 printk(KERN_INFO "9p: Unknown protocol version %s.\n", s);
93
94 return version;
95 }
96
97 /**
98 * parse_options - parse mount options into client structure
99 * @opts: options string passed from mount
100 * @clnt: existing v9fs client information
101 *
102 * Return 0 upon success, -ERRNO upon failure
103 */
104
105 static int parse_opts(char *opts, struct p9_client *clnt)
106 {
107 char *options, *tmp_options;
108 char *p;
109 substring_t args[MAX_OPT_ARGS];
110 int option;
111 char *s;
112 int ret = 0;
113
114 clnt->proto_version = p9_proto_2000u;
115 clnt->msize = 8192;
116
117 if (!opts)
118 return 0;
119
120 tmp_options = kstrdup(opts, GFP_KERNEL);
121 if (!tmp_options) {
122 P9_DPRINTK(P9_DEBUG_ERROR,
123 "failed to allocate copy of option string\n");
124 return -ENOMEM;
125 }
126 options = tmp_options;
127
128 while ((p = strsep(&options, ",")) != NULL) {
129 int token, r;
130 if (!*p)
131 continue;
132 token = match_token(p, tokens, args);
133 switch (token) {
134 case Opt_msize:
135 r = match_int(&args[0], &option);
136 if (r < 0) {
137 P9_DPRINTK(P9_DEBUG_ERROR,
138 "integer field, but no integer?\n");
139 ret = r;
140 continue;
141 }
142 clnt->msize = option;
143 break;
144 case Opt_trans:
145 s = match_strdup(&args[0]);
146 if (!s) {
147 ret = -ENOMEM;
148 P9_DPRINTK(P9_DEBUG_ERROR,
149 "problem allocating copy of trans arg\n");
150 goto free_and_return;
151 }
152 clnt->trans_mod = v9fs_get_trans_by_name(s);
153 if (clnt->trans_mod == NULL) {
154 printk(KERN_INFO
155 "9p: Could not find "
156 "request transport: %s\n", s);
157 ret = -EINVAL;
158 kfree(s);
159 goto free_and_return;
160 }
161 kfree(s);
162 break;
163 case Opt_legacy:
164 clnt->proto_version = p9_proto_legacy;
165 break;
166 case Opt_version:
167 s = match_strdup(&args[0]);
168 if (!s) {
169 ret = -ENOMEM;
170 P9_DPRINTK(P9_DEBUG_ERROR,
171 "problem allocating copy of version arg\n");
172 goto free_and_return;
173 }
174 ret = get_protocol_version(s);
175 if (ret == -EINVAL) {
176 kfree(s);
177 goto free_and_return;
178 }
179 kfree(s);
180 clnt->proto_version = ret;
181 break;
182 default:
183 continue;
184 }
185 }
186
187 free_and_return:
188 kfree(tmp_options);
189 return ret;
190 }
191
192 /**
193 * p9_tag_alloc - lookup/allocate a request by tag
194 * @c: client session to lookup tag within
195 * @tag: numeric id for transaction
196 *
197 * this is a simple array lookup, but will grow the
198 * request_slots as necessary to accommodate transaction
199 * ids which did not previously have a slot.
200 *
201 * this code relies on the client spinlock to manage locks, its
202 * possible we should switch to something else, but I'd rather
203 * stick with something low-overhead for the common case.
204 *
205 */
206
207 static struct p9_req_t *
208 p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
209 {
210 unsigned long flags;
211 int row, col;
212 struct p9_req_t *req;
213 int alloc_msize = min(c->msize, max_size);
214
215 /* This looks up the original request by tag so we know which
216 * buffer to read the data into */
217 tag++;
218
219 if (tag >= c->max_tag) {
220 spin_lock_irqsave(&c->lock, flags);
221 /* check again since original check was outside of lock */
222 while (tag >= c->max_tag) {
223 row = (tag / P9_ROW_MAXTAG);
224 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
225 sizeof(struct p9_req_t), GFP_ATOMIC);
226
227 if (!c->reqs[row]) {
228 printk(KERN_ERR "Couldn't grow tag array\n");
229 spin_unlock_irqrestore(&c->lock, flags);
230 return ERR_PTR(-ENOMEM);
231 }
232 for (col = 0; col < P9_ROW_MAXTAG; col++) {
233 c->reqs[row][col].status = REQ_STATUS_IDLE;
234 c->reqs[row][col].tc = NULL;
235 }
236 c->max_tag += P9_ROW_MAXTAG;
237 }
238 spin_unlock_irqrestore(&c->lock, flags);
239 }
240 row = tag / P9_ROW_MAXTAG;
241 col = tag % P9_ROW_MAXTAG;
242
243 req = &c->reqs[row][col];
244 if (!req->tc) {
245 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
246 if (!req->wq) {
247 printk(KERN_ERR "Couldn't grow tag array\n");
248 return ERR_PTR(-ENOMEM);
249 }
250 init_waitqueue_head(req->wq);
251 req->tc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
252 GFP_NOFS);
253 req->rc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
254 GFP_NOFS);
255 if ((!req->tc) || (!req->rc)) {
256 printk(KERN_ERR "Couldn't grow tag array\n");
257 kfree(req->tc);
258 kfree(req->rc);
259 kfree(req->wq);
260 req->tc = req->rc = NULL;
261 req->wq = NULL;
262 return ERR_PTR(-ENOMEM);
263 }
264 req->tc->capacity = alloc_msize;
265 req->rc->capacity = alloc_msize;
266 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
267 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
268 }
269
270 p9pdu_reset(req->tc);
271 p9pdu_reset(req->rc);
272
273 req->tc->tag = tag-1;
274 req->status = REQ_STATUS_ALLOC;
275
276 return &c->reqs[row][col];
277 }
278
279 /**
280 * p9_tag_lookup - lookup a request by tag
281 * @c: client session to lookup tag within
282 * @tag: numeric id for transaction
283 *
284 */
285
286 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
287 {
288 int row, col;
289
290 /* This looks up the original request by tag so we know which
291 * buffer to read the data into */
292 tag++;
293
294 if(tag >= c->max_tag)
295 return NULL;
296
297 row = tag / P9_ROW_MAXTAG;
298 col = tag % P9_ROW_MAXTAG;
299
300 return &c->reqs[row][col];
301 }
302 EXPORT_SYMBOL(p9_tag_lookup);
303
304 /**
305 * p9_tag_init - setup tags structure and contents
306 * @c: v9fs client struct
307 *
308 * This initializes the tags structure for each client instance.
309 *
310 */
311
312 static int p9_tag_init(struct p9_client *c)
313 {
314 int err = 0;
315
316 c->tagpool = p9_idpool_create();
317 if (IS_ERR(c->tagpool)) {
318 err = PTR_ERR(c->tagpool);
319 goto error;
320 }
321 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
322 if (err < 0) {
323 p9_idpool_destroy(c->tagpool);
324 goto error;
325 }
326 c->max_tag = 0;
327 error:
328 return err;
329 }
330
331 /**
332 * p9_tag_cleanup - cleans up tags structure and reclaims resources
333 * @c: v9fs client struct
334 *
335 * This frees resources associated with the tags structure
336 *
337 */
338 static void p9_tag_cleanup(struct p9_client *c)
339 {
340 int row, col;
341
342 /* check to insure all requests are idle */
343 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
344 for (col = 0; col < P9_ROW_MAXTAG; col++) {
345 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
346 P9_DPRINTK(P9_DEBUG_MUX,
347 "Attempting to cleanup non-free tag %d,%d\n",
348 row, col);
349 /* TODO: delay execution of cleanup */
350 return;
351 }
352 }
353 }
354
355 if (c->tagpool) {
356 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
357 p9_idpool_destroy(c->tagpool);
358 }
359
360 /* free requests associated with tags */
361 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
362 for (col = 0; col < P9_ROW_MAXTAG; col++) {
363 kfree(c->reqs[row][col].wq);
364 kfree(c->reqs[row][col].tc);
365 kfree(c->reqs[row][col].rc);
366 }
367 kfree(c->reqs[row]);
368 }
369 c->max_tag = 0;
370 }
371
372 /**
373 * p9_free_req - free a request and clean-up as necessary
374 * c: client state
375 * r: request to release
376 *
377 */
378
379 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
380 {
381 int tag = r->tc->tag;
382 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
383
384 r->status = REQ_STATUS_IDLE;
385 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
386 p9_idpool_put(tag, c->tagpool);
387 }
388
389 /**
390 * p9_client_cb - call back from transport to client
391 * c: client state
392 * req: request received
393 *
394 */
395 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
396 {
397 P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
398 wake_up(req->wq);
399 P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
400 }
401 EXPORT_SYMBOL(p9_client_cb);
402
403 /**
404 * p9_parse_header - parse header arguments out of a packet
405 * @pdu: packet to parse
406 * @size: size of packet
407 * @type: type of request
408 * @tag: tag of packet
409 * @rewind: set if we need to rewind offset afterwards
410 */
411
412 int
413 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
414 int rewind)
415 {
416 int8_t r_type;
417 int16_t r_tag;
418 int32_t r_size;
419 int offset = pdu->offset;
420 int err;
421
422 pdu->offset = 0;
423 if (pdu->size == 0)
424 pdu->size = 7;
425
426 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
427 if (err)
428 goto rewind_and_exit;
429
430 pdu->size = r_size;
431 pdu->id = r_type;
432 pdu->tag = r_tag;
433
434 P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size,
435 pdu->id, pdu->tag);
436
437 if (type)
438 *type = r_type;
439 if (tag)
440 *tag = r_tag;
441 if (size)
442 *size = r_size;
443
444
445 rewind_and_exit:
446 if (rewind)
447 pdu->offset = offset;
448 return err;
449 }
450 EXPORT_SYMBOL(p9_parse_header);
451
452 /**
453 * p9_check_errors - check 9p packet for error return and process it
454 * @c: current client instance
455 * @req: request to parse and check for error conditions
456 *
457 * returns error code if one is discovered, otherwise returns 0
458 *
459 * this will have to be more complicated if we have multiple
460 * error packet types
461 */
462
463 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
464 {
465 int8_t type;
466 int err;
467 int ecode;
468
469 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
470 /*
471 * dump the response from server
472 * This should be after check errors which poplulate pdu_fcall.
473 */
474 trace_9p_protocol_dump(c, req->rc);
475 if (err) {
476 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
477 return err;
478 }
479 if (type != P9_RERROR && type != P9_RLERROR)
480 return 0;
481
482 if (!p9_is_proto_dotl(c)) {
483 char *ename;
484 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
485 &ename, &ecode);
486 if (err)
487 goto out_err;
488
489 if (p9_is_proto_dotu(c))
490 err = -ecode;
491
492 if (!err || !IS_ERR_VALUE(err)) {
493 err = p9_errstr2errno(ename, strlen(ename));
494
495 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
496 -ecode, ename);
497 }
498 kfree(ename);
499 } else {
500 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
501 err = -ecode;
502
503 P9_DPRINTK(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
504 }
505
506 return err;
507
508 out_err:
509 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
510
511 return err;
512 }
513
514 /**
515 * p9_check_zc_errors - check 9p packet for error return and process it
516 * @c: current client instance
517 * @req: request to parse and check for error conditions
518 * @in_hdrlen: Size of response protocol buffer.
519 *
520 * returns error code if one is discovered, otherwise returns 0
521 *
522 * this will have to be more complicated if we have multiple
523 * error packet types
524 */
525
526 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
527 char *uidata, int in_hdrlen, int kern_buf)
528 {
529 int err;
530 int ecode;
531 int8_t type;
532 char *ename = NULL;
533
534 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
535 /*
536 * dump the response from server
537 * This should be after parse_header which poplulate pdu_fcall.
538 */
539 trace_9p_protocol_dump(c, req->rc);
540 if (err) {
541 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
542 return err;
543 }
544
545 if (type != P9_RERROR && type != P9_RLERROR)
546 return 0;
547
548 if (!p9_is_proto_dotl(c)) {
549 /* Error is reported in string format */
550 uint16_t len;
551 /* 7 = header size for RERROR, 2 is the size of string len; */
552 int inline_len = in_hdrlen - (7 + 2);
553
554 /* Read the size of error string */
555 err = p9pdu_readf(req->rc, c->proto_version, "w", &len);
556 if (err)
557 goto out_err;
558
559 ename = kmalloc(len + 1, GFP_NOFS);
560 if (!ename) {
561 err = -ENOMEM;
562 goto out_err;
563 }
564 if (len <= inline_len) {
565 /* We have error in protocol buffer itself */
566 if (pdu_read(req->rc, ename, len)) {
567 err = -EFAULT;
568 goto out_free;
569
570 }
571 } else {
572 /*
573 * Part of the data is in user space buffer.
574 */
575 if (pdu_read(req->rc, ename, inline_len)) {
576 err = -EFAULT;
577 goto out_free;
578
579 }
580 if (kern_buf) {
581 memcpy(ename + inline_len, uidata,
582 len - inline_len);
583 } else {
584 err = copy_from_user(ename + inline_len,
585 uidata, len - inline_len);
586 if (err) {
587 err = -EFAULT;
588 goto out_free;
589 }
590 }
591 }
592 ename[len] = 0;
593 if (p9_is_proto_dotu(c)) {
594 /* For dotu we also have error code */
595 err = p9pdu_readf(req->rc,
596 c->proto_version, "d", &ecode);
597 if (err)
598 goto out_free;
599 err = -ecode;
600 }
601 if (!err || !IS_ERR_VALUE(err)) {
602 err = p9_errstr2errno(ename, strlen(ename));
603
604 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
605 -ecode, ename);
606 }
607 kfree(ename);
608 } else {
609 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
610 err = -ecode;
611
612 P9_DPRINTK(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
613 }
614 return err;
615
616 out_free:
617 kfree(ename);
618 out_err:
619 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
620 return err;
621 }
622
623 static struct p9_req_t *
624 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
625
626 /**
627 * p9_client_flush - flush (cancel) a request
628 * @c: client state
629 * @oldreq: request to cancel
630 *
631 * This sents a flush for a particular request and links
632 * the flush request to the original request. The current
633 * code only supports a single flush request although the protocol
634 * allows for multiple flush requests to be sent for a single request.
635 *
636 */
637
638 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
639 {
640 struct p9_req_t *req;
641 int16_t oldtag;
642 int err;
643
644 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
645 if (err)
646 return err;
647
648 P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
649
650 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
651 if (IS_ERR(req))
652 return PTR_ERR(req);
653
654
655 /* if we haven't received a response for oldreq,
656 remove it from the list. */
657 spin_lock(&c->lock);
658 if (oldreq->status == REQ_STATUS_FLSH)
659 list_del(&oldreq->req_list);
660 spin_unlock(&c->lock);
661
662 p9_free_req(c, req);
663 return 0;
664 }
665
666 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
667 int8_t type, int req_size,
668 const char *fmt, va_list ap)
669 {
670 int tag, err;
671 struct p9_req_t *req;
672
673 P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
674
675 /* we allow for any status other than disconnected */
676 if (c->status == Disconnected)
677 return ERR_PTR(-EIO);
678
679 /* if status is begin_disconnected we allow only clunk request */
680 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
681 return ERR_PTR(-EIO);
682
683 tag = P9_NOTAG;
684 if (type != P9_TVERSION) {
685 tag = p9_idpool_get(c->tagpool);
686 if (tag < 0)
687 return ERR_PTR(-ENOMEM);
688 }
689
690 req = p9_tag_alloc(c, tag, req_size);
691 if (IS_ERR(req))
692 return req;
693
694 /* marshall the data */
695 p9pdu_prepare(req->tc, tag, type);
696 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
697 if (err)
698 goto reterr;
699 p9pdu_finalize(c, req->tc);
700 trace_9p_client_req(c, type, tag);
701 return req;
702 reterr:
703 p9_free_req(c, req);
704 return ERR_PTR(err);
705 }
706
707 /**
708 * p9_client_rpc - issue a request and wait for a response
709 * @c: client session
710 * @type: type of request
711 * @fmt: protocol format string (see protocol.c)
712 *
713 * Returns request structure (which client must free using p9_free_req)
714 */
715
716 static struct p9_req_t *
717 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
718 {
719 va_list ap;
720 int sigpending, err;
721 unsigned long flags;
722 struct p9_req_t *req;
723
724 va_start(ap, fmt);
725 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
726 va_end(ap);
727 if (IS_ERR(req))
728 return req;
729
730 if (signal_pending(current)) {
731 sigpending = 1;
732 clear_thread_flag(TIF_SIGPENDING);
733 } else
734 sigpending = 0;
735
736 err = c->trans_mod->request(c, req);
737 if (err < 0) {
738 if (err != -ERESTARTSYS && err != -EFAULT)
739 c->status = Disconnected;
740 goto reterr;
741 }
742 /* Wait for the response */
743 err = wait_event_interruptible(*req->wq,
744 req->status >= REQ_STATUS_RCVD);
745
746 if (req->status == REQ_STATUS_ERROR) {
747 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
748 err = req->t_err;
749 }
750 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
751 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
752 sigpending = 1;
753 clear_thread_flag(TIF_SIGPENDING);
754
755 if (c->trans_mod->cancel(c, req))
756 p9_client_flush(c, req);
757
758 /* if we received the response anyway, don't signal error */
759 if (req->status == REQ_STATUS_RCVD)
760 err = 0;
761 }
762 if (sigpending) {
763 spin_lock_irqsave(&current->sighand->siglock, flags);
764 recalc_sigpending();
765 spin_unlock_irqrestore(&current->sighand->siglock, flags);
766 }
767 if (err < 0)
768 goto reterr;
769
770 err = p9_check_errors(c, req);
771 trace_9p_client_res(c, type, req->rc->tag, err);
772 if (!err)
773 return req;
774 reterr:
775 p9_free_req(c, req);
776 return ERR_PTR(err);
777 }
778
779 /**
780 * p9_client_zc_rpc - issue a request and wait for a response
781 * @c: client session
782 * @type: type of request
783 * @uidata: user bffer that should be ued for zero copy read
784 * @uodata: user buffer that shoud be user for zero copy write
785 * @inlen: read buffer size
786 * @olen: write buffer size
787 * @hdrlen: reader header size, This is the size of response protocol data
788 * @fmt: protocol format string (see protocol.c)
789 *
790 * Returns request structure (which client must free using p9_free_req)
791 */
792 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
793 char *uidata, char *uodata,
794 int inlen, int olen, int in_hdrlen,
795 int kern_buf, const char *fmt, ...)
796 {
797 va_list ap;
798 int sigpending, err;
799 unsigned long flags;
800 struct p9_req_t *req;
801
802 va_start(ap, fmt);
803 /*
804 * We allocate a inline protocol data of only 4k bytes.
805 * The actual content is passed in zero-copy fashion.
806 */
807 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
808 va_end(ap);
809 if (IS_ERR(req))
810 return req;
811
812 if (signal_pending(current)) {
813 sigpending = 1;
814 clear_thread_flag(TIF_SIGPENDING);
815 } else
816 sigpending = 0;
817
818 /* If we are called with KERNEL_DS force kern_buf */
819 if (segment_eq(get_fs(), KERNEL_DS))
820 kern_buf = 1;
821
822 err = c->trans_mod->zc_request(c, req, uidata, uodata,
823 inlen, olen, in_hdrlen, kern_buf);
824 if (err < 0) {
825 if (err == -EIO)
826 c->status = Disconnected;
827 goto reterr;
828 }
829 if (req->status == REQ_STATUS_ERROR) {
830 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
831 err = req->t_err;
832 }
833 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
834 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
835 sigpending = 1;
836 clear_thread_flag(TIF_SIGPENDING);
837
838 if (c->trans_mod->cancel(c, req))
839 p9_client_flush(c, req);
840
841 /* if we received the response anyway, don't signal error */
842 if (req->status == REQ_STATUS_RCVD)
843 err = 0;
844 }
845 if (sigpending) {
846 spin_lock_irqsave(&current->sighand->siglock, flags);
847 recalc_sigpending();
848 spin_unlock_irqrestore(&current->sighand->siglock, flags);
849 }
850 if (err < 0)
851 goto reterr;
852
853 err = p9_check_zc_errors(c, req, uidata, in_hdrlen, kern_buf);
854 trace_9p_client_res(c, type, req->rc->tag, err);
855 if (!err)
856 return req;
857 reterr:
858 p9_free_req(c, req);
859 return ERR_PTR(err);
860 }
861
862 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
863 {
864 int ret;
865 struct p9_fid *fid;
866 unsigned long flags;
867
868 P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
869 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
870 if (!fid)
871 return ERR_PTR(-ENOMEM);
872
873 ret = p9_idpool_get(clnt->fidpool);
874 if (ret < 0) {
875 ret = -ENOSPC;
876 goto error;
877 }
878 fid->fid = ret;
879
880 memset(&fid->qid, 0, sizeof(struct p9_qid));
881 fid->mode = -1;
882 fid->uid = current_fsuid();
883 fid->clnt = clnt;
884 fid->rdir = NULL;
885 spin_lock_irqsave(&clnt->lock, flags);
886 list_add(&fid->flist, &clnt->fidlist);
887 spin_unlock_irqrestore(&clnt->lock, flags);
888
889 return fid;
890
891 error:
892 kfree(fid);
893 return ERR_PTR(ret);
894 }
895
896 static void p9_fid_destroy(struct p9_fid *fid)
897 {
898 struct p9_client *clnt;
899 unsigned long flags;
900
901 P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
902 clnt = fid->clnt;
903 p9_idpool_put(fid->fid, clnt->fidpool);
904 spin_lock_irqsave(&clnt->lock, flags);
905 list_del(&fid->flist);
906 spin_unlock_irqrestore(&clnt->lock, flags);
907 kfree(fid->rdir);
908 kfree(fid);
909 }
910
911 static int p9_client_version(struct p9_client *c)
912 {
913 int err = 0;
914 struct p9_req_t *req;
915 char *version;
916 int msize;
917
918 P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
919 c->msize, c->proto_version);
920
921 switch (c->proto_version) {
922 case p9_proto_2000L:
923 req = p9_client_rpc(c, P9_TVERSION, "ds",
924 c->msize, "9P2000.L");
925 break;
926 case p9_proto_2000u:
927 req = p9_client_rpc(c, P9_TVERSION, "ds",
928 c->msize, "9P2000.u");
929 break;
930 case p9_proto_legacy:
931 req = p9_client_rpc(c, P9_TVERSION, "ds",
932 c->msize, "9P2000");
933 break;
934 default:
935 return -EINVAL;
936 break;
937 }
938
939 if (IS_ERR(req))
940 return PTR_ERR(req);
941
942 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
943 if (err) {
944 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
945 trace_9p_protocol_dump(c, req->rc);
946 goto error;
947 }
948
949 P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
950 if (!strncmp(version, "9P2000.L", 8))
951 c->proto_version = p9_proto_2000L;
952 else if (!strncmp(version, "9P2000.u", 8))
953 c->proto_version = p9_proto_2000u;
954 else if (!strncmp(version, "9P2000", 6))
955 c->proto_version = p9_proto_legacy;
956 else {
957 err = -EREMOTEIO;
958 goto error;
959 }
960
961 if (msize < c->msize)
962 c->msize = msize;
963
964 error:
965 kfree(version);
966 p9_free_req(c, req);
967
968 return err;
969 }
970
971 struct p9_client *p9_client_create(const char *dev_name, char *options)
972 {
973 int err;
974 struct p9_client *clnt;
975
976 err = 0;
977 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
978 if (!clnt)
979 return ERR_PTR(-ENOMEM);
980
981 clnt->trans_mod = NULL;
982 clnt->trans = NULL;
983 spin_lock_init(&clnt->lock);
984 INIT_LIST_HEAD(&clnt->fidlist);
985
986 err = p9_tag_init(clnt);
987 if (err < 0)
988 goto free_client;
989
990 err = parse_opts(options, clnt);
991 if (err < 0)
992 goto destroy_tagpool;
993
994 if (!clnt->trans_mod)
995 clnt->trans_mod = v9fs_get_default_trans();
996
997 if (clnt->trans_mod == NULL) {
998 err = -EPROTONOSUPPORT;
999 P9_DPRINTK(P9_DEBUG_ERROR,
1000 "No transport defined or default transport\n");
1001 goto destroy_tagpool;
1002 }
1003
1004 clnt->fidpool = p9_idpool_create();
1005 if (IS_ERR(clnt->fidpool)) {
1006 err = PTR_ERR(clnt->fidpool);
1007 goto put_trans;
1008 }
1009
1010 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1011 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1012
1013 err = clnt->trans_mod->create(clnt, dev_name, options);
1014 if (err)
1015 goto destroy_fidpool;
1016
1017 if (clnt->msize > clnt->trans_mod->maxsize)
1018 clnt->msize = clnt->trans_mod->maxsize;
1019
1020 err = p9_client_version(clnt);
1021 if (err)
1022 goto close_trans;
1023
1024 return clnt;
1025
1026 close_trans:
1027 clnt->trans_mod->close(clnt);
1028 destroy_fidpool:
1029 p9_idpool_destroy(clnt->fidpool);
1030 put_trans:
1031 v9fs_put_trans(clnt->trans_mod);
1032 destroy_tagpool:
1033 p9_idpool_destroy(clnt->tagpool);
1034 free_client:
1035 kfree(clnt);
1036 return ERR_PTR(err);
1037 }
1038 EXPORT_SYMBOL(p9_client_create);
1039
1040 void p9_client_destroy(struct p9_client *clnt)
1041 {
1042 struct p9_fid *fid, *fidptr;
1043
1044 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt);
1045
1046 if (clnt->trans_mod)
1047 clnt->trans_mod->close(clnt);
1048
1049 v9fs_put_trans(clnt->trans_mod);
1050
1051 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
1052 printk(KERN_INFO "Found fid %d not clunked\n", fid->fid);
1053 p9_fid_destroy(fid);
1054 }
1055
1056 if (clnt->fidpool)
1057 p9_idpool_destroy(clnt->fidpool);
1058
1059 p9_tag_cleanup(clnt);
1060
1061 kfree(clnt);
1062 }
1063 EXPORT_SYMBOL(p9_client_destroy);
1064
1065 void p9_client_disconnect(struct p9_client *clnt)
1066 {
1067 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
1068 clnt->status = Disconnected;
1069 }
1070 EXPORT_SYMBOL(p9_client_disconnect);
1071
1072 void p9_client_begin_disconnect(struct p9_client *clnt)
1073 {
1074 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
1075 clnt->status = BeginDisconnect;
1076 }
1077 EXPORT_SYMBOL(p9_client_begin_disconnect);
1078
1079 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1080 char *uname, u32 n_uname, char *aname)
1081 {
1082 int err = 0;
1083 struct p9_req_t *req;
1084 struct p9_fid *fid;
1085 struct p9_qid qid;
1086
1087
1088 P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1089 afid ? afid->fid : -1, uname, aname);
1090 fid = p9_fid_create(clnt);
1091 if (IS_ERR(fid)) {
1092 err = PTR_ERR(fid);
1093 fid = NULL;
1094 goto error;
1095 }
1096
1097 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
1098 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1099 if (IS_ERR(req)) {
1100 err = PTR_ERR(req);
1101 goto error;
1102 }
1103
1104 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
1105 if (err) {
1106 trace_9p_protocol_dump(clnt, req->rc);
1107 p9_free_req(clnt, req);
1108 goto error;
1109 }
1110
1111 P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1112 qid.type,
1113 (unsigned long long)qid.path,
1114 qid.version);
1115
1116 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1117
1118 p9_free_req(clnt, req);
1119 return fid;
1120
1121 error:
1122 if (fid)
1123 p9_fid_destroy(fid);
1124 return ERR_PTR(err);
1125 }
1126 EXPORT_SYMBOL(p9_client_attach);
1127
1128 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1129 char **wnames, int clone)
1130 {
1131 int err;
1132 struct p9_client *clnt;
1133 struct p9_fid *fid;
1134 struct p9_qid *wqids;
1135 struct p9_req_t *req;
1136 uint16_t nwqids, count;
1137
1138 err = 0;
1139 wqids = NULL;
1140 clnt = oldfid->clnt;
1141 if (clone) {
1142 fid = p9_fid_create(clnt);
1143 if (IS_ERR(fid)) {
1144 err = PTR_ERR(fid);
1145 fid = NULL;
1146 goto error;
1147 }
1148
1149 fid->uid = oldfid->uid;
1150 } else
1151 fid = oldfid;
1152
1153
1154 P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1155 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1156
1157 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1158 nwname, wnames);
1159 if (IS_ERR(req)) {
1160 err = PTR_ERR(req);
1161 goto error;
1162 }
1163
1164 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1165 if (err) {
1166 trace_9p_protocol_dump(clnt, req->rc);
1167 p9_free_req(clnt, req);
1168 goto clunk_fid;
1169 }
1170 p9_free_req(clnt, req);
1171
1172 P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1173
1174 if (nwqids != nwname) {
1175 err = -ENOENT;
1176 goto clunk_fid;
1177 }
1178
1179 for (count = 0; count < nwqids; count++)
1180 P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1181 count, wqids[count].type,
1182 (unsigned long long)wqids[count].path,
1183 wqids[count].version);
1184
1185 if (nwname)
1186 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1187 else
1188 fid->qid = oldfid->qid;
1189
1190 kfree(wqids);
1191 return fid;
1192
1193 clunk_fid:
1194 kfree(wqids);
1195 p9_client_clunk(fid);
1196 fid = NULL;
1197
1198 error:
1199 if (fid && (fid != oldfid))
1200 p9_fid_destroy(fid);
1201
1202 return ERR_PTR(err);
1203 }
1204 EXPORT_SYMBOL(p9_client_walk);
1205
1206 int p9_client_open(struct p9_fid *fid, int mode)
1207 {
1208 int err;
1209 struct p9_client *clnt;
1210 struct p9_req_t *req;
1211 struct p9_qid qid;
1212 int iounit;
1213
1214 clnt = fid->clnt;
1215 P9_DPRINTK(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1216 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1217 err = 0;
1218
1219 if (fid->mode != -1)
1220 return -EINVAL;
1221
1222 if (p9_is_proto_dotl(clnt))
1223 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1224 else
1225 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1226 if (IS_ERR(req)) {
1227 err = PTR_ERR(req);
1228 goto error;
1229 }
1230
1231 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1232 if (err) {
1233 trace_9p_protocol_dump(clnt, req->rc);
1234 goto free_and_error;
1235 }
1236
1237 P9_DPRINTK(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1238 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1239 (unsigned long long)qid.path, qid.version, iounit);
1240
1241 fid->mode = mode;
1242 fid->iounit = iounit;
1243
1244 free_and_error:
1245 p9_free_req(clnt, req);
1246 error:
1247 return err;
1248 }
1249 EXPORT_SYMBOL(p9_client_open);
1250
1251 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1252 gid_t gid, struct p9_qid *qid)
1253 {
1254 int err = 0;
1255 struct p9_client *clnt;
1256 struct p9_req_t *req;
1257 int iounit;
1258
1259 P9_DPRINTK(P9_DEBUG_9P,
1260 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1261 ofid->fid, name, flags, mode, gid);
1262 clnt = ofid->clnt;
1263
1264 if (ofid->mode != -1)
1265 return -EINVAL;
1266
1267 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags,
1268 mode, gid);
1269 if (IS_ERR(req)) {
1270 err = PTR_ERR(req);
1271 goto error;
1272 }
1273
1274 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1275 if (err) {
1276 trace_9p_protocol_dump(clnt, req->rc);
1277 goto free_and_error;
1278 }
1279
1280 P9_DPRINTK(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1281 qid->type,
1282 (unsigned long long)qid->path,
1283 qid->version, iounit);
1284
1285 ofid->mode = mode;
1286 ofid->iounit = iounit;
1287
1288 free_and_error:
1289 p9_free_req(clnt, req);
1290 error:
1291 return err;
1292 }
1293 EXPORT_SYMBOL(p9_client_create_dotl);
1294
1295 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1296 char *extension)
1297 {
1298 int err;
1299 struct p9_client *clnt;
1300 struct p9_req_t *req;
1301 struct p9_qid qid;
1302 int iounit;
1303
1304 P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1305 fid->fid, name, perm, mode);
1306 err = 0;
1307 clnt = fid->clnt;
1308
1309 if (fid->mode != -1)
1310 return -EINVAL;
1311
1312 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1313 mode, extension);
1314 if (IS_ERR(req)) {
1315 err = PTR_ERR(req);
1316 goto error;
1317 }
1318
1319 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1320 if (err) {
1321 trace_9p_protocol_dump(clnt, req->rc);
1322 goto free_and_error;
1323 }
1324
1325 P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1326 qid.type,
1327 (unsigned long long)qid.path,
1328 qid.version, iounit);
1329
1330 fid->mode = mode;
1331 fid->iounit = iounit;
1332
1333 free_and_error:
1334 p9_free_req(clnt, req);
1335 error:
1336 return err;
1337 }
1338 EXPORT_SYMBOL(p9_client_fcreate);
1339
1340 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid,
1341 struct p9_qid *qid)
1342 {
1343 int err = 0;
1344 struct p9_client *clnt;
1345 struct p9_req_t *req;
1346
1347 P9_DPRINTK(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1348 dfid->fid, name, symtgt);
1349 clnt = dfid->clnt;
1350
1351 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt,
1352 gid);
1353 if (IS_ERR(req)) {
1354 err = PTR_ERR(req);
1355 goto error;
1356 }
1357
1358 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1359 if (err) {
1360 trace_9p_protocol_dump(clnt, req->rc);
1361 goto free_and_error;
1362 }
1363
1364 P9_DPRINTK(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1365 qid->type, (unsigned long long)qid->path, qid->version);
1366
1367 free_and_error:
1368 p9_free_req(clnt, req);
1369 error:
1370 return err;
1371 }
1372 EXPORT_SYMBOL(p9_client_symlink);
1373
1374 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1375 {
1376 struct p9_client *clnt;
1377 struct p9_req_t *req;
1378
1379 P9_DPRINTK(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1380 dfid->fid, oldfid->fid, newname);
1381 clnt = dfid->clnt;
1382 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1383 newname);
1384 if (IS_ERR(req))
1385 return PTR_ERR(req);
1386
1387 P9_DPRINTK(P9_DEBUG_9P, "<<< RLINK\n");
1388 p9_free_req(clnt, req);
1389 return 0;
1390 }
1391 EXPORT_SYMBOL(p9_client_link);
1392
1393 int p9_client_fsync(struct p9_fid *fid, int datasync)
1394 {
1395 int err;
1396 struct p9_client *clnt;
1397 struct p9_req_t *req;
1398
1399 P9_DPRINTK(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1400 fid->fid, datasync);
1401 err = 0;
1402 clnt = fid->clnt;
1403
1404 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1405 if (IS_ERR(req)) {
1406 err = PTR_ERR(req);
1407 goto error;
1408 }
1409
1410 P9_DPRINTK(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1411
1412 p9_free_req(clnt, req);
1413
1414 error:
1415 return err;
1416 }
1417 EXPORT_SYMBOL(p9_client_fsync);
1418
1419 int p9_client_clunk(struct p9_fid *fid)
1420 {
1421 int err;
1422 struct p9_client *clnt;
1423 struct p9_req_t *req;
1424
1425 if (!fid) {
1426 P9_EPRINTK(KERN_WARNING, "Trying to clunk with NULL fid\n");
1427 dump_stack();
1428 return 0;
1429 }
1430
1431 P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
1432 err = 0;
1433 clnt = fid->clnt;
1434
1435 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1436 if (IS_ERR(req)) {
1437 err = PTR_ERR(req);
1438 goto error;
1439 }
1440
1441 P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1442
1443 p9_free_req(clnt, req);
1444 error:
1445 /*
1446 * Fid is not valid even after a failed clunk
1447 */
1448 p9_fid_destroy(fid);
1449 return err;
1450 }
1451 EXPORT_SYMBOL(p9_client_clunk);
1452
1453 int p9_client_remove(struct p9_fid *fid)
1454 {
1455 int err;
1456 struct p9_client *clnt;
1457 struct p9_req_t *req;
1458
1459 P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1460 err = 0;
1461 clnt = fid->clnt;
1462
1463 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1464 if (IS_ERR(req)) {
1465 err = PTR_ERR(req);
1466 goto error;
1467 }
1468
1469 P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1470
1471 p9_free_req(clnt, req);
1472 error:
1473 p9_fid_destroy(fid);
1474 return err;
1475 }
1476 EXPORT_SYMBOL(p9_client_remove);
1477
1478 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1479 {
1480 int err = 0;
1481 struct p9_req_t *req;
1482 struct p9_client *clnt;
1483
1484 P9_DPRINTK(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1485 dfid->fid, name, flags);
1486
1487 clnt = dfid->clnt;
1488 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1489 if (IS_ERR(req)) {
1490 err = PTR_ERR(req);
1491 goto error;
1492 }
1493 P9_DPRINTK(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1494
1495 p9_free_req(clnt, req);
1496 error:
1497 return err;
1498 }
1499 EXPORT_SYMBOL(p9_client_unlinkat);
1500
1501 int
1502 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1503 u32 count)
1504 {
1505 char *dataptr;
1506 int kernel_buf = 0;
1507 struct p9_req_t *req;
1508 struct p9_client *clnt;
1509 int err, rsize, non_zc = 0;
1510
1511
1512 P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1513 fid->fid, (long long unsigned) offset, count);
1514 err = 0;
1515 clnt = fid->clnt;
1516
1517 rsize = fid->iounit;
1518 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1519 rsize = clnt->msize - P9_IOHDRSZ;
1520
1521 if (count < rsize)
1522 rsize = count;
1523
1524 /* Don't bother zerocopy for small IO (< 1024) */
1525 if (clnt->trans_mod->zc_request && rsize > 1024) {
1526 char *indata;
1527 if (data) {
1528 kernel_buf = 1;
1529 indata = data;
1530 } else
1531 indata = (char *)udata;
1532 /*
1533 * response header len is 11
1534 * PDU Header(7) + IO Size (4)
1535 */
1536 req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0,
1537 11, kernel_buf, "dqd", fid->fid,
1538 offset, rsize);
1539 } else {
1540 non_zc = 1;
1541 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1542 rsize);
1543 }
1544 if (IS_ERR(req)) {
1545 err = PTR_ERR(req);
1546 goto error;
1547 }
1548
1549 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1550 if (err) {
1551 trace_9p_protocol_dump(clnt, req->rc);
1552 goto free_and_error;
1553 }
1554
1555 P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1556
1557 if (non_zc) {
1558 if (data) {
1559 memmove(data, dataptr, count);
1560 } else {
1561 err = copy_to_user(udata, dataptr, count);
1562 if (err) {
1563 err = -EFAULT;
1564 goto free_and_error;
1565 }
1566 }
1567 }
1568 p9_free_req(clnt, req);
1569 return count;
1570
1571 free_and_error:
1572 p9_free_req(clnt, req);
1573 error:
1574 return err;
1575 }
1576 EXPORT_SYMBOL(p9_client_read);
1577
1578 int
1579 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1580 u64 offset, u32 count)
1581 {
1582 int err, rsize;
1583 int kernel_buf = 0;
1584 struct p9_client *clnt;
1585 struct p9_req_t *req;
1586
1587 P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1588 fid->fid, (long long unsigned) offset, count);
1589 err = 0;
1590 clnt = fid->clnt;
1591
1592 rsize = fid->iounit;
1593 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1594 rsize = clnt->msize - P9_IOHDRSZ;
1595
1596 if (count < rsize)
1597 rsize = count;
1598
1599 /* Don't bother zerocopy for small IO (< 1024) */
1600 if (clnt->trans_mod->zc_request && rsize > 1024) {
1601 char *odata;
1602 if (data) {
1603 kernel_buf = 1;
1604 odata = data;
1605 } else
1606 odata = (char *)udata;
1607 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize,
1608 P9_ZC_HDR_SZ, kernel_buf, "dqd",
1609 fid->fid, offset, rsize);
1610 } else {
1611 if (data)
1612 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
1613 offset, rsize, data);
1614 else
1615 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
1616 offset, rsize, udata);
1617 }
1618 if (IS_ERR(req)) {
1619 err = PTR_ERR(req);
1620 goto error;
1621 }
1622
1623 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1624 if (err) {
1625 trace_9p_protocol_dump(clnt, req->rc);
1626 goto free_and_error;
1627 }
1628
1629 P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1630
1631 p9_free_req(clnt, req);
1632 return count;
1633
1634 free_and_error:
1635 p9_free_req(clnt, req);
1636 error:
1637 return err;
1638 }
1639 EXPORT_SYMBOL(p9_client_write);
1640
1641 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1642 {
1643 int err;
1644 struct p9_client *clnt;
1645 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1646 struct p9_req_t *req;
1647 u16 ignored;
1648
1649 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1650
1651 if (!ret)
1652 return ERR_PTR(-ENOMEM);
1653
1654 err = 0;
1655 clnt = fid->clnt;
1656
1657 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1658 if (IS_ERR(req)) {
1659 err = PTR_ERR(req);
1660 goto error;
1661 }
1662
1663 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1664 if (err) {
1665 trace_9p_protocol_dump(clnt, req->rc);
1666 p9_free_req(clnt, req);
1667 goto error;
1668 }
1669
1670 P9_DPRINTK(P9_DEBUG_9P,
1671 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1672 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1673 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1674 "<<< uid=%d gid=%d n_muid=%d\n",
1675 ret->size, ret->type, ret->dev, ret->qid.type,
1676 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1677 ret->atime, ret->mtime, (unsigned long long)ret->length,
1678 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1679 ret->n_uid, ret->n_gid, ret->n_muid);
1680
1681 p9_free_req(clnt, req);
1682 return ret;
1683
1684 error:
1685 kfree(ret);
1686 return ERR_PTR(err);
1687 }
1688 EXPORT_SYMBOL(p9_client_stat);
1689
1690 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1691 u64 request_mask)
1692 {
1693 int err;
1694 struct p9_client *clnt;
1695 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1696 GFP_KERNEL);
1697 struct p9_req_t *req;
1698
1699 P9_DPRINTK(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1700 fid->fid, request_mask);
1701
1702 if (!ret)
1703 return ERR_PTR(-ENOMEM);
1704
1705 err = 0;
1706 clnt = fid->clnt;
1707
1708 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1709 if (IS_ERR(req)) {
1710 err = PTR_ERR(req);
1711 goto error;
1712 }
1713
1714 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1715 if (err) {
1716 trace_9p_protocol_dump(clnt, req->rc);
1717 p9_free_req(clnt, req);
1718 goto error;
1719 }
1720
1721 P9_DPRINTK(P9_DEBUG_9P,
1722 "<<< RGETATTR st_result_mask=%lld\n"
1723 "<<< qid=%x.%llx.%x\n"
1724 "<<< st_mode=%8.8x st_nlink=%llu\n"
1725 "<<< st_uid=%d st_gid=%d\n"
1726 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1727 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1728 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1729 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1730 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1731 "<<< st_gen=%lld st_data_version=%lld",
1732 ret->st_result_mask, ret->qid.type, ret->qid.path,
1733 ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid,
1734 ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize,
1735 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1736 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1737 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1738 ret->st_gen, ret->st_data_version);
1739
1740 p9_free_req(clnt, req);
1741 return ret;
1742
1743 error:
1744 kfree(ret);
1745 return ERR_PTR(err);
1746 }
1747 EXPORT_SYMBOL(p9_client_getattr_dotl);
1748
1749 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1750 {
1751 int ret;
1752
1753 /* NOTE: size shouldn't include its own length */
1754 /* size[2] type[2] dev[4] qid[13] */
1755 /* mode[4] atime[4] mtime[4] length[8]*/
1756 /* name[s] uid[s] gid[s] muid[s] */
1757 ret = 2+4+13+4+4+4+8+2+2+2+2;
1758
1759 if (wst->name)
1760 ret += strlen(wst->name);
1761 if (wst->uid)
1762 ret += strlen(wst->uid);
1763 if (wst->gid)
1764 ret += strlen(wst->gid);
1765 if (wst->muid)
1766 ret += strlen(wst->muid);
1767
1768 if ((proto_version == p9_proto_2000u) ||
1769 (proto_version == p9_proto_2000L)) {
1770 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1771 if (wst->extension)
1772 ret += strlen(wst->extension);
1773 }
1774
1775 return ret;
1776 }
1777
1778 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1779 {
1780 int err;
1781 struct p9_req_t *req;
1782 struct p9_client *clnt;
1783
1784 err = 0;
1785 clnt = fid->clnt;
1786 wst->size = p9_client_statsize(wst, clnt->proto_version);
1787 P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1788 P9_DPRINTK(P9_DEBUG_9P,
1789 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1790 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1791 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1792 " uid=%d gid=%d n_muid=%d\n",
1793 wst->size, wst->type, wst->dev, wst->qid.type,
1794 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1795 wst->atime, wst->mtime, (unsigned long long)wst->length,
1796 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1797 wst->n_uid, wst->n_gid, wst->n_muid);
1798
1799 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1800 if (IS_ERR(req)) {
1801 err = PTR_ERR(req);
1802 goto error;
1803 }
1804
1805 P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1806
1807 p9_free_req(clnt, req);
1808 error:
1809 return err;
1810 }
1811 EXPORT_SYMBOL(p9_client_wstat);
1812
1813 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1814 {
1815 int err;
1816 struct p9_req_t *req;
1817 struct p9_client *clnt;
1818
1819 err = 0;
1820 clnt = fid->clnt;
1821 P9_DPRINTK(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1822 P9_DPRINTK(P9_DEBUG_9P,
1823 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1824 " atime_sec=%lld atime_nsec=%lld\n"
1825 " mtime_sec=%lld mtime_nsec=%lld\n",
1826 p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid,
1827 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1828 p9attr->mtime_sec, p9attr->mtime_nsec);
1829
1830 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1831
1832 if (IS_ERR(req)) {
1833 err = PTR_ERR(req);
1834 goto error;
1835 }
1836 P9_DPRINTK(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1837 p9_free_req(clnt, req);
1838 error:
1839 return err;
1840 }
1841 EXPORT_SYMBOL(p9_client_setattr);
1842
1843 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1844 {
1845 int err;
1846 struct p9_req_t *req;
1847 struct p9_client *clnt;
1848
1849 err = 0;
1850 clnt = fid->clnt;
1851
1852 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1853
1854 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1855 if (IS_ERR(req)) {
1856 err = PTR_ERR(req);
1857 goto error;
1858 }
1859
1860 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1861 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1862 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1863 if (err) {
1864 trace_9p_protocol_dump(clnt, req->rc);
1865 p9_free_req(clnt, req);
1866 goto error;
1867 }
1868
1869 P9_DPRINTK(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1870 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1871 "fsid %llu namelen %ld\n",
1872 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1873 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1874 sb->fsid, (long int)sb->namelen);
1875
1876 p9_free_req(clnt, req);
1877 error:
1878 return err;
1879 }
1880 EXPORT_SYMBOL(p9_client_statfs);
1881
1882 int p9_client_rename(struct p9_fid *fid,
1883 struct p9_fid *newdirfid, const char *name)
1884 {
1885 int err;
1886 struct p9_req_t *req;
1887 struct p9_client *clnt;
1888
1889 err = 0;
1890 clnt = fid->clnt;
1891
1892 P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1893 fid->fid, newdirfid->fid, name);
1894
1895 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1896 newdirfid->fid, name);
1897 if (IS_ERR(req)) {
1898 err = PTR_ERR(req);
1899 goto error;
1900 }
1901
1902 P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1903
1904 p9_free_req(clnt, req);
1905 error:
1906 return err;
1907 }
1908 EXPORT_SYMBOL(p9_client_rename);
1909
1910 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1911 struct p9_fid *newdirfid, const char *new_name)
1912 {
1913 int err;
1914 struct p9_req_t *req;
1915 struct p9_client *clnt;
1916
1917 err = 0;
1918 clnt = olddirfid->clnt;
1919
1920 P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1921 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1922 newdirfid->fid, new_name);
1923
1924 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1925 old_name, newdirfid->fid, new_name);
1926 if (IS_ERR(req)) {
1927 err = PTR_ERR(req);
1928 goto error;
1929 }
1930
1931 P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1932 newdirfid->fid, new_name);
1933
1934 p9_free_req(clnt, req);
1935 error:
1936 return err;
1937 }
1938 EXPORT_SYMBOL(p9_client_renameat);
1939
1940 /*
1941 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1942 */
1943 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1944 const char *attr_name, u64 *attr_size)
1945 {
1946 int err;
1947 struct p9_req_t *req;
1948 struct p9_client *clnt;
1949 struct p9_fid *attr_fid;
1950
1951 err = 0;
1952 clnt = file_fid->clnt;
1953 attr_fid = p9_fid_create(clnt);
1954 if (IS_ERR(attr_fid)) {
1955 err = PTR_ERR(attr_fid);
1956 attr_fid = NULL;
1957 goto error;
1958 }
1959 P9_DPRINTK(P9_DEBUG_9P,
1960 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
1961 file_fid->fid, attr_fid->fid, attr_name);
1962
1963 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
1964 file_fid->fid, attr_fid->fid, attr_name);
1965 if (IS_ERR(req)) {
1966 err = PTR_ERR(req);
1967 goto error;
1968 }
1969 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
1970 if (err) {
1971 trace_9p_protocol_dump(clnt, req->rc);
1972 p9_free_req(clnt, req);
1973 goto clunk_fid;
1974 }
1975 p9_free_req(clnt, req);
1976 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
1977 attr_fid->fid, *attr_size);
1978 return attr_fid;
1979 clunk_fid:
1980 p9_client_clunk(attr_fid);
1981 attr_fid = NULL;
1982 error:
1983 if (attr_fid && (attr_fid != file_fid))
1984 p9_fid_destroy(attr_fid);
1985
1986 return ERR_PTR(err);
1987 }
1988 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
1989
1990 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
1991 u64 attr_size, int flags)
1992 {
1993 int err;
1994 struct p9_req_t *req;
1995 struct p9_client *clnt;
1996
1997 P9_DPRINTK(P9_DEBUG_9P,
1998 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
1999 fid->fid, name, (long long)attr_size, flags);
2000 err = 0;
2001 clnt = fid->clnt;
2002 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2003 fid->fid, name, attr_size, flags);
2004 if (IS_ERR(req)) {
2005 err = PTR_ERR(req);
2006 goto error;
2007 }
2008 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2009 p9_free_req(clnt, req);
2010 error:
2011 return err;
2012 }
2013 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2014
2015 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2016 {
2017 int err, rsize, non_zc = 0;
2018 struct p9_client *clnt;
2019 struct p9_req_t *req;
2020 char *dataptr;
2021
2022 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2023 fid->fid, (long long unsigned) offset, count);
2024
2025 err = 0;
2026 clnt = fid->clnt;
2027
2028 rsize = fid->iounit;
2029 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2030 rsize = clnt->msize - P9_READDIRHDRSZ;
2031
2032 if (count < rsize)
2033 rsize = count;
2034
2035 /* Don't bother zerocopy for small IO (< 1024) */
2036 if (clnt->trans_mod->zc_request && rsize > 1024) {
2037 /*
2038 * response header len is 11
2039 * PDU Header(7) + IO Size (4)
2040 */
2041 req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0,
2042 11, 1, "dqd", fid->fid, offset, rsize);
2043 } else {
2044 non_zc = 1;
2045 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2046 offset, rsize);
2047 }
2048 if (IS_ERR(req)) {
2049 err = PTR_ERR(req);
2050 goto error;
2051 }
2052
2053 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2054 if (err) {
2055 trace_9p_protocol_dump(clnt, req->rc);
2056 goto free_and_error;
2057 }
2058
2059 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2060
2061 if (non_zc)
2062 memmove(data, dataptr, count);
2063
2064 p9_free_req(clnt, req);
2065 return count;
2066
2067 free_and_error:
2068 p9_free_req(clnt, req);
2069 error:
2070 return err;
2071 }
2072 EXPORT_SYMBOL(p9_client_readdir);
2073
2074 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
2075 dev_t rdev, gid_t gid, struct p9_qid *qid)
2076 {
2077 int err;
2078 struct p9_client *clnt;
2079 struct p9_req_t *req;
2080
2081 err = 0;
2082 clnt = fid->clnt;
2083 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2084 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2085 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode,
2086 MAJOR(rdev), MINOR(rdev), gid);
2087 if (IS_ERR(req))
2088 return PTR_ERR(req);
2089
2090 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2091 if (err) {
2092 trace_9p_protocol_dump(clnt, req->rc);
2093 goto error;
2094 }
2095 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2096 (unsigned long long)qid->path, qid->version);
2097
2098 error:
2099 p9_free_req(clnt, req);
2100 return err;
2101
2102 }
2103 EXPORT_SYMBOL(p9_client_mknod_dotl);
2104
2105 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
2106 gid_t gid, struct p9_qid *qid)
2107 {
2108 int err;
2109 struct p9_client *clnt;
2110 struct p9_req_t *req;
2111
2112 err = 0;
2113 clnt = fid->clnt;
2114 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2115 fid->fid, name, mode, gid);
2116 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode,
2117 gid);
2118 if (IS_ERR(req))
2119 return PTR_ERR(req);
2120
2121 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2122 if (err) {
2123 trace_9p_protocol_dump(clnt, req->rc);
2124 goto error;
2125 }
2126 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2127 (unsigned long long)qid->path, qid->version);
2128
2129 error:
2130 p9_free_req(clnt, req);
2131 return err;
2132
2133 }
2134 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2135
2136 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2137 {
2138 int err;
2139 struct p9_client *clnt;
2140 struct p9_req_t *req;
2141
2142 err = 0;
2143 clnt = fid->clnt;
2144 P9_DPRINTK(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2145 "start %lld length %lld proc_id %d client_id %s\n",
2146 fid->fid, flock->type, flock->flags, flock->start,
2147 flock->length, flock->proc_id, flock->client_id);
2148
2149 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2150 flock->flags, flock->start, flock->length,
2151 flock->proc_id, flock->client_id);
2152
2153 if (IS_ERR(req))
2154 return PTR_ERR(req);
2155
2156 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2157 if (err) {
2158 trace_9p_protocol_dump(clnt, req->rc);
2159 goto error;
2160 }
2161 P9_DPRINTK(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2162 error:
2163 p9_free_req(clnt, req);
2164 return err;
2165
2166 }
2167 EXPORT_SYMBOL(p9_client_lock_dotl);
2168
2169 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2170 {
2171 int err;
2172 struct p9_client *clnt;
2173 struct p9_req_t *req;
2174
2175 err = 0;
2176 clnt = fid->clnt;
2177 P9_DPRINTK(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2178 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2179 glock->start, glock->length, glock->proc_id, glock->client_id);
2180
2181 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2182 glock->start, glock->length, glock->proc_id, glock->client_id);
2183
2184 if (IS_ERR(req))
2185 return PTR_ERR(req);
2186
2187 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2188 &glock->start, &glock->length, &glock->proc_id,
2189 &glock->client_id);
2190 if (err) {
2191 trace_9p_protocol_dump(clnt, req->rc);
2192 goto error;
2193 }
2194 P9_DPRINTK(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2195 "proc_id %d client_id %s\n", glock->type, glock->start,
2196 glock->length, glock->proc_id, glock->client_id);
2197 error:
2198 p9_free_req(clnt, req);
2199 return err;
2200 }
2201 EXPORT_SYMBOL(p9_client_getlock_dotl);
2202
2203 int p9_client_readlink(struct p9_fid *fid, char **target)
2204 {
2205 int err;
2206 struct p9_client *clnt;
2207 struct p9_req_t *req;
2208
2209 err = 0;
2210 clnt = fid->clnt;
2211 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2212
2213 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2214 if (IS_ERR(req))
2215 return PTR_ERR(req);
2216
2217 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2218 if (err) {
2219 trace_9p_protocol_dump(clnt, req->rc);
2220 goto error;
2221 }
2222 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2223 error:
2224 p9_free_req(clnt, req);
2225 return err;
2226 }
2227 EXPORT_SYMBOL(p9_client_readlink);
Linus' kernel tree