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Merge branch 'akpm'
[linux-2.6/next.git] / net / 9p / client.c
blob985aef8615457cf7bce33b9582763df42ed09a4f
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;
130 if (!*p)
131 continue;
132 token = match_token(p, tokens, args);
133 if (token < Opt_trans) {
134 int r = match_int(&args[0], &option);
135 if (r < 0) {
136 P9_DPRINTK(P9_DEBUG_ERROR,
137 "integer field, but no integer?\n");
138 ret = r;
139 continue;
140 }
141 }
142 switch (token) {
143 case Opt_msize:
144 clnt->msize = option;
145 break;
146 case Opt_trans:
147 s = match_strdup(&args[0]);
148 if (!s) {
149 ret = -ENOMEM;
150 P9_DPRINTK(P9_DEBUG_ERROR,
151 "problem allocating copy of trans arg\n");
152 goto free_and_return;
153 }
154 clnt->trans_mod = v9fs_get_trans_by_name(s);
155 if (clnt->trans_mod == NULL) {
156 printk(KERN_INFO
157 "9p: Could not find "
158 "request transport: %s\n", s);
159 ret = -EINVAL;
160 kfree(s);
161 goto free_and_return;
162 }
163 kfree(s);
164 break;
165 case Opt_legacy:
166 clnt->proto_version = p9_proto_legacy;
167 break;
168 case Opt_version:
169 s = match_strdup(&args[0]);
170 if (!s) {
171 ret = -ENOMEM;
172 P9_DPRINTK(P9_DEBUG_ERROR,
173 "problem allocating copy of version arg\n");
174 goto free_and_return;
175 }
176 ret = get_protocol_version(s);
177 if (ret == -EINVAL) {
178 kfree(s);
179 goto free_and_return;
180 }
181 kfree(s);
182 clnt->proto_version = ret;
183 break;
184 default:
185 continue;
186 }
187 }
188
189 free_and_return:
190 kfree(tmp_options);
191 return ret;
192 }
193
194 /**
195 * p9_tag_alloc - lookup/allocate a request by tag
196 * @c: client session to lookup tag within
197 * @tag: numeric id for transaction
198 *
199 * this is a simple array lookup, but will grow the
200 * request_slots as necessary to accommodate transaction
201 * ids which did not previously have a slot.
202 *
203 * this code relies on the client spinlock to manage locks, its
204 * possible we should switch to something else, but I'd rather
205 * stick with something low-overhead for the common case.
206 *
207 */
208
209 static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag, int max_size)
210 {
211 unsigned long flags;
212 int row, col;
213 struct p9_req_t *req;
214 int alloc_msize = min(c->msize, max_size);
215
216 /* This looks up the original request by tag so we know which
217 * buffer to read the data into */
218 tag++;
219
220 if (tag >= c->max_tag) {
221 spin_lock_irqsave(&c->lock, flags);
222 /* check again since original check was outside of lock */
223 while (tag >= c->max_tag) {
224 row = (tag / P9_ROW_MAXTAG);
225 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
226 sizeof(struct p9_req_t), GFP_ATOMIC);
227
228 if (!c->reqs[row]) {
229 printk(KERN_ERR "Couldn't grow tag array\n");
230 spin_unlock_irqrestore(&c->lock, flags);
231 return ERR_PTR(-ENOMEM);
232 }
233 for (col = 0; col < P9_ROW_MAXTAG; col++) {
234 c->reqs[row][col].status = REQ_STATUS_IDLE;
235 c->reqs[row][col].tc = NULL;
236 }
237 c->max_tag += P9_ROW_MAXTAG;
238 }
239 spin_unlock_irqrestore(&c->lock, flags);
240 }
241 row = tag / P9_ROW_MAXTAG;
242 col = tag % P9_ROW_MAXTAG;
243
244 req = &c->reqs[row][col];
245 if (!req->tc) {
246 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
247 if (!req->wq) {
248 printk(KERN_ERR "Couldn't grow tag array\n");
249 return ERR_PTR(-ENOMEM);
250 }
251 init_waitqueue_head(req->wq);
252 req->tc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
253 GFP_NOFS);
254 req->tc->capacity = alloc_msize;
255 req->rc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
256 GFP_NOFS);
257 req->rc->capacity = alloc_msize;
258 if ((!req->tc) || (!req->rc)) {
259 printk(KERN_ERR "Couldn't grow tag array\n");
260 kfree(req->tc);
261 kfree(req->rc);
262 kfree(req->wq);
263 req->tc = req->rc = NULL;
264 req->wq = NULL;
265 return ERR_PTR(-ENOMEM);
266 }
267 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
268 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
269 }
270
271 p9pdu_reset(req->tc);
272 p9pdu_reset(req->rc);
273
274 req->tc->tag = tag-1;
275 req->status = REQ_STATUS_ALLOC;
276
277 return &c->reqs[row][col];
278 }
279
280 /**
281 * p9_tag_lookup - lookup a request by tag
282 * @c: client session to lookup tag within
283 * @tag: numeric id for transaction
284 *
285 */
286
287 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
288 {
289 int row, col;
290
291 /* This looks up the original request by tag so we know which
292 * buffer to read the data into */
293 tag++;
294
295 if(tag >= c->max_tag)
296 return NULL;
297
298 row = tag / P9_ROW_MAXTAG;
299 col = tag % P9_ROW_MAXTAG;
300
301 return &c->reqs[row][col];
302 }
303 EXPORT_SYMBOL(p9_tag_lookup);
304
305 /**
306 * p9_tag_init - setup tags structure and contents
307 * @c: v9fs client struct
308 *
309 * This initializes the tags structure for each client instance.
310 *
311 */
312
313 static int p9_tag_init(struct p9_client *c)
314 {
315 int err = 0;
316
317 c->tagpool = p9_idpool_create();
318 if (IS_ERR(c->tagpool)) {
319 err = PTR_ERR(c->tagpool);
320 goto error;
321 }
322 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
323 if (err < 0) {
324 p9_idpool_destroy(c->tagpool);
325 goto error;
326 }
327 c->max_tag = 0;
328 error:
329 return err;
330 }
331
332 /**
333 * p9_tag_cleanup - cleans up tags structure and reclaims resources
334 * @c: v9fs client struct
335 *
336 * This frees resources associated with the tags structure
337 *
338 */
339 static void p9_tag_cleanup(struct p9_client *c)
340 {
341 int row, col;
342
343 /* check to insure all requests are idle */
344 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
345 for (col = 0; col < P9_ROW_MAXTAG; col++) {
346 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
347 P9_DPRINTK(P9_DEBUG_MUX,
348 "Attempting to cleanup non-free tag %d,%d\n",
349 row, col);
350 /* TODO: delay execution of cleanup */
351 return;
352 }
353 }
354 }
355
356 if (c->tagpool) {
357 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
358 p9_idpool_destroy(c->tagpool);
359 }
360
361 /* free requests associated with tags */
362 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
363 for (col = 0; col < P9_ROW_MAXTAG; col++) {
364 kfree(c->reqs[row][col].wq);
365 kfree(c->reqs[row][col].tc);
366 kfree(c->reqs[row][col].rc);
367 }
368 kfree(c->reqs[row]);
369 }
370 c->max_tag = 0;
371 }
372
373 /**
374 * p9_free_req - free a request and clean-up as necessary
375 * c: client state
376 * r: request to release
377 *
378 */
379
380 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
381 {
382 int tag = r->tc->tag;
383 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
384
385 r->status = REQ_STATUS_IDLE;
386 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
387 p9_idpool_put(tag, c->tagpool);
388 }
389
390 /**
391 * p9_client_cb - call back from transport to client
392 * c: client state
393 * req: request received
394 *
395 */
396 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
397 {
398 P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
399 wake_up(req->wq);
400 P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
401 }
402 EXPORT_SYMBOL(p9_client_cb);
403
404 /**
405 * p9_parse_header - parse header arguments out of a packet
406 * @pdu: packet to parse
407 * @size: size of packet
408 * @type: type of request
409 * @tag: tag of packet
410 * @rewind: set if we need to rewind offset afterwards
411 */
412
413 int
414 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
415 int rewind)
416 {
417 int8_t r_type;
418 int16_t r_tag;
419 int32_t r_size;
420 int offset = pdu->offset;
421 int err;
422
423 pdu->offset = 0;
424 if (pdu->size == 0)
425 pdu->size = 7;
426
427 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
428 if (err)
429 goto rewind_and_exit;
430
431 pdu->size = r_size;
432 pdu->id = r_type;
433 pdu->tag = r_tag;
434
435 P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size,
436 pdu->id, pdu->tag);
437
438 if (type)
439 *type = r_type;
440 if (tag)
441 *tag = r_tag;
442 if (size)
443 *size = r_size;
444
445
446 rewind_and_exit:
447 if (rewind)
448 pdu->offset = offset;
449 return err;
450 }
451 EXPORT_SYMBOL(p9_parse_header);
452
453 /**
454 * p9_check_errors - check 9p packet for error return and process it
455 * @c: current client instance
456 * @req: request to parse and check for error conditions
457 *
458 * returns error code if one is discovered, otherwise returns 0
459 *
460 * this will have to be more complicated if we have multiple
461 * error packet types
462 */
463
464 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
465 {
466 int8_t type;
467 int err;
468 int ecode;
469
470 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
471 /*
472 * dump the response from server
473 * This should be after check errors which poplulate pdu_fcall.
474 */
475 trace_9p_protocol_dump(c, req->rc);
476 if (err) {
477 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
478 return err;
479 }
480 if (type != P9_RERROR && type != P9_RLERROR)
481 return 0;
482
483 if (!p9_is_proto_dotl(c)) {
484 char *ename;
485 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
486 &ename, &ecode);
487 if (err)
488 goto out_err;
489
490 if (p9_is_proto_dotu(c))
491 err = -ecode;
492
493 if (!err || !IS_ERR_VALUE(err)) {
494 err = p9_errstr2errno(ename, strlen(ename));
495
496 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
497 -ecode, ename);
498 }
499 kfree(ename);
500 } else {
501 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
502 err = -ecode;
503
504 P9_DPRINTK(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
505 }
506
507 return err;
508
509 out_err:
510 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
511
512 return err;
513 }
514
515 /**
516 * p9_check_zc_errors - check 9p packet for error return and process it
517 * @c: current client instance
518 * @req: request to parse and check for error conditions
519 * @in_hdrlen: Size of response protocol buffer.
520 *
521 * returns error code if one is discovered, otherwise returns 0
522 *
523 * this will have to be more complicated if we have multiple
524 * error packet types
525 */
526
527 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
528 char *uidata, int in_hdrlen, int kern_buf)
529 {
530 int err;
531 int ecode;
532 int8_t type;
533 char *ename = NULL;
534
535 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
536 /*
537 * dump the response from server
538 * This should be after parse_header which poplulate pdu_fcall.
539 */
540 trace_9p_protocol_dump(c, req->rc);
541 if (err) {
542 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
543 return err;
544 }
545
546 if (type != P9_RERROR && type != P9_RLERROR)
547 return 0;
548
549 if (!p9_is_proto_dotl(c)) {
550 /* Error is reported in string format */
551 uint16_t len;
552 /* 7 = header size for RERROR, 2 is the size of string len; */
553 int inline_len = in_hdrlen - (7 + 2);
554
555 /* Read the size of error string */
556 err = p9pdu_readf(req->rc, c->proto_version, "w", &len);
557 if (err)
558 goto out_err;
559
560 ename = kmalloc(len + 1, GFP_NOFS);
561 if (!ename) {
562 err = -ENOMEM;
563 goto out_err;
564 }
565 if (len <= inline_len) {
566 /* We have error in protocol buffer itself */
567 if (pdu_read(req->rc, ename, len)) {
568 err = -EFAULT;
569 goto out_free;
570
571 }
572 } else {
573 /*
574 * Part of the data is in user space buffer.
575 */
576 if (pdu_read(req->rc, ename, inline_len)) {
577 err = -EFAULT;
578 goto out_free;
579
580 }
581 if (kern_buf) {
582 memcpy(ename + inline_len, uidata,
583 len - inline_len);
584 } else {
585 err = copy_from_user(ename + inline_len,
586 uidata, len - inline_len);
587 if (err) {
588 err = -EFAULT;
589 goto out_free;
590 }
591 }
592 }
593 ename[len] = 0;
594 if (p9_is_proto_dotu(c)) {
595 /* For dotu we also have error code */
596 err = p9pdu_readf(req->rc,
597 c->proto_version, "d", &ecode);
598 if (err)
599 goto out_free;
600 err = -ecode;
601 }
602 if (!err || !IS_ERR_VALUE(err)) {
603 err = p9_errstr2errno(ename, strlen(ename));
604
605 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
606 -ecode, ename);
607 }
608 kfree(ename);
609 } else {
610 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
611 err = -ecode;
612
613 P9_DPRINTK(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
614 }
615 return err;
616
617 out_free:
618 kfree(ename);
619 out_err:
620 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
621 return err;
622 }
623
624 static struct p9_req_t *
625 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
626
627 /**
628 * p9_client_flush - flush (cancel) a request
629 * @c: client state
630 * @oldreq: request to cancel
631 *
632 * This sents a flush for a particular request and links
633 * the flush request to the original request. The current
634 * code only supports a single flush request although the protocol
635 * allows for multiple flush requests to be sent for a single request.
636 *
637 */
638
639 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
640 {
641 struct p9_req_t *req;
642 int16_t oldtag;
643 int err;
644
645 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
646 if (err)
647 return err;
648
649 P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
650
651 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
652 if (IS_ERR(req))
653 return PTR_ERR(req);
654
655
656 /* if we haven't received a response for oldreq,
657 remove it from the list. */
658 spin_lock(&c->lock);
659 if (oldreq->status == REQ_STATUS_FLSH)
660 list_del(&oldreq->req_list);
661 spin_unlock(&c->lock);
662
663 p9_free_req(c, req);
664 return 0;
665 }
666
667 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
668 int8_t type, int req_size,
669 const char *fmt, va_list ap)
670 {
671 int tag, err;
672 struct p9_req_t *req;
673
674 P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
675
676 /* we allow for any status other than disconnected */
677 if (c->status == Disconnected)
678 return ERR_PTR(-EIO);
679
680 /* if status is begin_disconnected we allow only clunk request */
681 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
682 return ERR_PTR(-EIO);
683
684 tag = P9_NOTAG;
685 if (type != P9_TVERSION) {
686 tag = p9_idpool_get(c->tagpool);
687 if (tag < 0)
688 return ERR_PTR(-ENOMEM);
689 }
690
691 req = p9_tag_alloc(c, tag, req_size);
692 if (IS_ERR(req))
693 return req;
694
695 /* marshall the data */
696 p9pdu_prepare(req->tc, tag, type);
697 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
698 if (err)
699 goto reterr;
700 p9pdu_finalize(c, req->tc);
701 trace_9p_client_req(c, type, tag);
702 return req;
703 reterr:
704 p9_free_req(c, req);
705 return ERR_PTR(err);
706 }
707
708 /**
709 * p9_client_rpc - issue a request and wait for a response
710 * @c: client session
711 * @type: type of request
712 * @fmt: protocol format string (see protocol.c)
713 *
714 * Returns request structure (which client must free using p9_free_req)
715 */
716
717 static struct p9_req_t *
718 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
719 {
720 va_list ap;
721 int sigpending, err;
722 unsigned long flags;
723 struct p9_req_t *req;
724
725 va_start(ap, fmt);
726 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
727 va_end(ap);
728 if (IS_ERR(req))
729 return req;
730
731 if (signal_pending(current)) {
732 sigpending = 1;
733 clear_thread_flag(TIF_SIGPENDING);
734 } else
735 sigpending = 0;
736
737 err = c->trans_mod->request(c, req);
738 if (err < 0) {
739 if (err != -ERESTARTSYS && err != -EFAULT)
740 c->status = Disconnected;
741 goto reterr;
742 }
743 /* Wait for the response */
744 err = wait_event_interruptible(*req->wq,
745 req->status >= REQ_STATUS_RCVD);
746
747 if (req->status == REQ_STATUS_ERROR) {
748 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
749 err = req->t_err;
750 }
751 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
752 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
753 sigpending = 1;
754 clear_thread_flag(TIF_SIGPENDING);
755
756 if (c->trans_mod->cancel(c, req))
757 p9_client_flush(c, req);
758
759 /* if we received the response anyway, don't signal error */
760 if (req->status == REQ_STATUS_RCVD)
761 err = 0;
762 }
763 if (sigpending) {
764 spin_lock_irqsave(&current->sighand->siglock, flags);
765 recalc_sigpending();
766 spin_unlock_irqrestore(&current->sighand->siglock, flags);
767 }
768 if (err < 0)
769 goto reterr;
770
771 err = p9_check_errors(c, req);
772 trace_9p_client_res(c, type, req->rc->tag, err);
773 if (!err)
774 return req;
775 reterr:
776 p9_free_req(c, req);
777 return ERR_PTR(err);
778 }
779
780 /**
781 * p9_client_zc_rpc - issue a request and wait for a response
782 * @c: client session
783 * @type: type of request
784 * @uidata: user bffer that should be ued for zero copy read
785 * @uodata: user buffer that shoud be user for zero copy write
786 * @inlen: read buffer size
787 * @olen: write buffer size
788 * @hdrlen: reader header size, This is the size of response protocol data
789 * @fmt: protocol format string (see protocol.c)
790 *
791 * Returns request structure (which client must free using p9_free_req)
792 */
793 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
794 char *uidata, char *uodata,
795 int inlen, int olen, int in_hdrlen,
796 int kern_buf, const char *fmt, ...)
797 {
798 va_list ap;
799 int sigpending, err;
800 unsigned long flags;
801 struct p9_req_t *req;
802
803 va_start(ap, fmt);
804 /*
805 * We allocate a inline protocol data of only 4k bytes.
806 * The actual content is passed in zero-copy fashion.
807 */
808 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
809 va_end(ap);
810 if (IS_ERR(req))
811 return req;
812
813 if (signal_pending(current)) {
814 sigpending = 1;
815 clear_thread_flag(TIF_SIGPENDING);
816 } else
817 sigpending = 0;
818
819 /* If we are called with KERNEL_DS force kern_buf */
820 if (segment_eq(get_fs(), KERNEL_DS))
821 kern_buf = 1;
822
823 err = c->trans_mod->zc_request(c, req, uidata, uodata,
824 inlen, olen, in_hdrlen, kern_buf);
825 if (err < 0) {
826 if (err == -EIO)
827 c->status = Disconnected;
828 goto reterr;
829 }
830 if (req->status == REQ_STATUS_ERROR) {
831 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
832 err = req->t_err;
833 }
834 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
835 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
836 sigpending = 1;
837 clear_thread_flag(TIF_SIGPENDING);
838
839 if (c->trans_mod->cancel(c, req))
840 p9_client_flush(c, req);
841
842 /* if we received the response anyway, don't signal error */
843 if (req->status == REQ_STATUS_RCVD)
844 err = 0;
845 }
846 if (sigpending) {
847 spin_lock_irqsave(&current->sighand->siglock, flags);
848 recalc_sigpending();
849 spin_unlock_irqrestore(&current->sighand->siglock, flags);
850 }
851 if (err < 0)
852 goto reterr;
853
854 err = p9_check_zc_errors(c, req, uidata, in_hdrlen, kern_buf);
855 trace_9p_client_res(c, type, req->rc->tag, err);
856 if (!err)
857 return req;
858 reterr:
859 p9_free_req(c, req);
860 return ERR_PTR(err);
861 }
862
863 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
864 {
865 int ret;
866 struct p9_fid *fid;
867 unsigned long flags;
868
869 P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
870 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
871 if (!fid)
872 return ERR_PTR(-ENOMEM);
873
874 ret = p9_idpool_get(clnt->fidpool);
875 if (ret < 0) {
876 ret = -ENOSPC;
877 goto error;
878 }
879 fid->fid = ret;
880
881 memset(&fid->qid, 0, sizeof(struct p9_qid));
882 fid->mode = -1;
883 fid->uid = current_fsuid();
884 fid->clnt = clnt;
885 fid->rdir = NULL;
886 spin_lock_irqsave(&clnt->lock, flags);
887 list_add(&fid->flist, &clnt->fidlist);
888 spin_unlock_irqrestore(&clnt->lock, flags);
889
890 return fid;
891
892 error:
893 kfree(fid);
894 return ERR_PTR(ret);
895 }
896
897 static void p9_fid_destroy(struct p9_fid *fid)
898 {
899 struct p9_client *clnt;
900 unsigned long flags;
901
902 P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
903 clnt = fid->clnt;
904 p9_idpool_put(fid->fid, clnt->fidpool);
905 spin_lock_irqsave(&clnt->lock, flags);
906 list_del(&fid->flist);
907 spin_unlock_irqrestore(&clnt->lock, flags);
908 kfree(fid->rdir);
909 kfree(fid);
910 }
911
912 static int p9_client_version(struct p9_client *c)
913 {
914 int err = 0;
915 struct p9_req_t *req;
916 char *version;
917 int msize;
918
919 P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
920 c->msize, c->proto_version);
921
922 switch (c->proto_version) {
923 case p9_proto_2000L:
924 req = p9_client_rpc(c, P9_TVERSION, "ds",
925 c->msize, "9P2000.L");
926 break;
927 case p9_proto_2000u:
928 req = p9_client_rpc(c, P9_TVERSION, "ds",
929 c->msize, "9P2000.u");
930 break;
931 case p9_proto_legacy:
932 req = p9_client_rpc(c, P9_TVERSION, "ds",
933 c->msize, "9P2000");
934 break;
935 default:
936 return -EINVAL;
937 break;
938 }
939
940 if (IS_ERR(req))
941 return PTR_ERR(req);
942
943 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
944 if (err) {
945 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
946 trace_9p_protocol_dump(c, req->rc);
947 goto error;
948 }
949
950 P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
951 if (!strncmp(version, "9P2000.L", 8))
952 c->proto_version = p9_proto_2000L;
953 else if (!strncmp(version, "9P2000.u", 8))
954 c->proto_version = p9_proto_2000u;
955 else if (!strncmp(version, "9P2000", 6))
956 c->proto_version = p9_proto_legacy;
957 else {
958 err = -EREMOTEIO;
959 goto error;
960 }
961
962 if (msize < c->msize)
963 c->msize = msize;
964
965 error:
966 kfree(version);
967 p9_free_req(c, req);
968
969 return err;
970 }
971
972 struct p9_client *p9_client_create(const char *dev_name, char *options)
973 {
974 int err;
975 struct p9_client *clnt;
976
977 err = 0;
978 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
979 if (!clnt)
980 return ERR_PTR(-ENOMEM);
981
982 clnt->trans_mod = NULL;
983 clnt->trans = NULL;
984 spin_lock_init(&clnt->lock);
985 INIT_LIST_HEAD(&clnt->fidlist);
986
987 err = p9_tag_init(clnt);
988 if (err < 0)
989 goto free_client;
990
991 err = parse_opts(options, clnt);
992 if (err < 0)
993 goto destroy_tagpool;
994
995 if (!clnt->trans_mod)
996 clnt->trans_mod = v9fs_get_default_trans();
997
998 if (clnt->trans_mod == NULL) {
999 err = -EPROTONOSUPPORT;
1000 P9_DPRINTK(P9_DEBUG_ERROR,
1001 "No transport defined or default transport\n");
1002 goto destroy_tagpool;
1003 }
1004
1005 clnt->fidpool = p9_idpool_create();
1006 if (IS_ERR(clnt->fidpool)) {
1007 err = PTR_ERR(clnt->fidpool);
1008 goto put_trans;
1009 }
1010
1011 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1012 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1013
1014 err = clnt->trans_mod->create(clnt, dev_name, options);
1015 if (err)
1016 goto destroy_fidpool;
1017
1018 if (clnt->msize > clnt->trans_mod->maxsize)
1019 clnt->msize = clnt->trans_mod->maxsize;
1020
1021 err = p9_client_version(clnt);
1022 if (err)
1023 goto close_trans;
1024
1025 return clnt;
1026
1027 close_trans:
1028 clnt->trans_mod->close(clnt);
1029 destroy_fidpool:
1030 p9_idpool_destroy(clnt->fidpool);
1031 put_trans:
1032 v9fs_put_trans(clnt->trans_mod);
1033 destroy_tagpool:
1034 p9_idpool_destroy(clnt->tagpool);
1035 free_client:
1036 kfree(clnt);
1037 return ERR_PTR(err);
1038 }
1039 EXPORT_SYMBOL(p9_client_create);
1040
1041 void p9_client_destroy(struct p9_client *clnt)
1042 {
1043 struct p9_fid *fid, *fidptr;
1044
1045 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt);
1046
1047 if (clnt->trans_mod)
1048 clnt->trans_mod->close(clnt);
1049
1050 v9fs_put_trans(clnt->trans_mod);
1051
1052 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
1053 printk(KERN_INFO "Found fid %d not clunked\n", fid->fid);
1054 p9_fid_destroy(fid);
1055 }
1056
1057 if (clnt->fidpool)
1058 p9_idpool_destroy(clnt->fidpool);
1059
1060 p9_tag_cleanup(clnt);
1061
1062 kfree(clnt);
1063 }
1064 EXPORT_SYMBOL(p9_client_destroy);
1065
1066 void p9_client_disconnect(struct p9_client *clnt)
1067 {
1068 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
1069 clnt->status = Disconnected;
1070 }
1071 EXPORT_SYMBOL(p9_client_disconnect);
1072
1073 void p9_client_begin_disconnect(struct p9_client *clnt)
1074 {
1075 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
1076 clnt->status = BeginDisconnect;
1077 }
1078 EXPORT_SYMBOL(p9_client_begin_disconnect);
1079
1080 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1081 char *uname, u32 n_uname, char *aname)
1082 {
1083 int err = 0;
1084 struct p9_req_t *req;
1085 struct p9_fid *fid;
1086 struct p9_qid qid;
1087
1088
1089 P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1090 afid ? afid->fid : -1, uname, aname);
1091 fid = p9_fid_create(clnt);
1092 if (IS_ERR(fid)) {
1093 err = PTR_ERR(fid);
1094 fid = NULL;
1095 goto error;
1096 }
1097
1098 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
1099 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1100 if (IS_ERR(req)) {
1101 err = PTR_ERR(req);
1102 goto error;
1103 }
1104
1105 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
1106 if (err) {
1107 trace_9p_protocol_dump(clnt, req->rc);
1108 p9_free_req(clnt, req);
1109 goto error;
1110 }
1111
1112 P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1113 qid.type,
1114 (unsigned long long)qid.path,
1115 qid.version);
1116
1117 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1118
1119 p9_free_req(clnt, req);
1120 return fid;
1121
1122 error:
1123 if (fid)
1124 p9_fid_destroy(fid);
1125 return ERR_PTR(err);
1126 }
1127 EXPORT_SYMBOL(p9_client_attach);
1128
1129 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1130 char **wnames, int clone)
1131 {
1132 int err;
1133 struct p9_client *clnt;
1134 struct p9_fid *fid;
1135 struct p9_qid *wqids;
1136 struct p9_req_t *req;
1137 uint16_t nwqids, count;
1138
1139 err = 0;
1140 wqids = NULL;
1141 clnt = oldfid->clnt;
1142 if (clone) {
1143 fid = p9_fid_create(clnt);
1144 if (IS_ERR(fid)) {
1145 err = PTR_ERR(fid);
1146 fid = NULL;
1147 goto error;
1148 }
1149
1150 fid->uid = oldfid->uid;
1151 } else
1152 fid = oldfid;
1153
1154
1155 P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1156 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1157
1158 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1159 nwname, wnames);
1160 if (IS_ERR(req)) {
1161 err = PTR_ERR(req);
1162 goto error;
1163 }
1164
1165 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1166 if (err) {
1167 trace_9p_protocol_dump(clnt, req->rc);
1168 p9_free_req(clnt, req);
1169 goto clunk_fid;
1170 }
1171 p9_free_req(clnt, req);
1172
1173 P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1174
1175 if (nwqids != nwname) {
1176 err = -ENOENT;
1177 goto clunk_fid;
1178 }
1179
1180 for (count = 0; count < nwqids; count++)
1181 P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1182 count, wqids[count].type,
1183 (unsigned long long)wqids[count].path,
1184 wqids[count].version);
1185
1186 if (nwname)
1187 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1188 else
1189 fid->qid = oldfid->qid;
1190
1191 kfree(wqids);
1192 return fid;
1193
1194 clunk_fid:
1195 kfree(wqids);
1196 p9_client_clunk(fid);
1197 fid = NULL;
1198
1199 error:
1200 if (fid && (fid != oldfid))
1201 p9_fid_destroy(fid);
1202
1203 return ERR_PTR(err);
1204 }
1205 EXPORT_SYMBOL(p9_client_walk);
1206
1207 int p9_client_open(struct p9_fid *fid, int mode)
1208 {
1209 int err;
1210 struct p9_client *clnt;
1211 struct p9_req_t *req;
1212 struct p9_qid qid;
1213 int iounit;
1214
1215 clnt = fid->clnt;
1216 P9_DPRINTK(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1217 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1218 err = 0;
1219
1220 if (fid->mode != -1)
1221 return -EINVAL;
1222
1223 if (p9_is_proto_dotl(clnt))
1224 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1225 else
1226 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1227 if (IS_ERR(req)) {
1228 err = PTR_ERR(req);
1229 goto error;
1230 }
1231
1232 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1233 if (err) {
1234 trace_9p_protocol_dump(clnt, req->rc);
1235 goto free_and_error;
1236 }
1237
1238 P9_DPRINTK(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1239 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1240 (unsigned long long)qid.path, qid.version, iounit);
1241
1242 fid->mode = mode;
1243 fid->iounit = iounit;
1244
1245 free_and_error:
1246 p9_free_req(clnt, req);
1247 error:
1248 return err;
1249 }
1250 EXPORT_SYMBOL(p9_client_open);
1251
1252 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1253 gid_t gid, struct p9_qid *qid)
1254 {
1255 int err = 0;
1256 struct p9_client *clnt;
1257 struct p9_req_t *req;
1258 int iounit;
1259
1260 P9_DPRINTK(P9_DEBUG_9P,
1261 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1262 ofid->fid, name, flags, mode, gid);
1263 clnt = ofid->clnt;
1264
1265 if (ofid->mode != -1)
1266 return -EINVAL;
1267
1268 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags,
1269 mode, gid);
1270 if (IS_ERR(req)) {
1271 err = PTR_ERR(req);
1272 goto error;
1273 }
1274
1275 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1276 if (err) {
1277 trace_9p_protocol_dump(clnt, req->rc);
1278 goto free_and_error;
1279 }
1280
1281 P9_DPRINTK(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1282 qid->type,
1283 (unsigned long long)qid->path,
1284 qid->version, iounit);
1285
1286 ofid->mode = mode;
1287 ofid->iounit = iounit;
1288
1289 free_and_error:
1290 p9_free_req(clnt, req);
1291 error:
1292 return err;
1293 }
1294 EXPORT_SYMBOL(p9_client_create_dotl);
1295
1296 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1297 char *extension)
1298 {
1299 int err;
1300 struct p9_client *clnt;
1301 struct p9_req_t *req;
1302 struct p9_qid qid;
1303 int iounit;
1304
1305 P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1306 fid->fid, name, perm, mode);
1307 err = 0;
1308 clnt = fid->clnt;
1309
1310 if (fid->mode != -1)
1311 return -EINVAL;
1312
1313 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1314 mode, extension);
1315 if (IS_ERR(req)) {
1316 err = PTR_ERR(req);
1317 goto error;
1318 }
1319
1320 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1321 if (err) {
1322 trace_9p_protocol_dump(clnt, req->rc);
1323 goto free_and_error;
1324 }
1325
1326 P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1327 qid.type,
1328 (unsigned long long)qid.path,
1329 qid.version, iounit);
1330
1331 fid->mode = mode;
1332 fid->iounit = iounit;
1333
1334 free_and_error:
1335 p9_free_req(clnt, req);
1336 error:
1337 return err;
1338 }
1339 EXPORT_SYMBOL(p9_client_fcreate);
1340
1341 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid,
1342 struct p9_qid *qid)
1343 {
1344 int err = 0;
1345 struct p9_client *clnt;
1346 struct p9_req_t *req;
1347
1348 P9_DPRINTK(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1349 dfid->fid, name, symtgt);
1350 clnt = dfid->clnt;
1351
1352 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt,
1353 gid);
1354 if (IS_ERR(req)) {
1355 err = PTR_ERR(req);
1356 goto error;
1357 }
1358
1359 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1360 if (err) {
1361 trace_9p_protocol_dump(clnt, req->rc);
1362 goto free_and_error;
1363 }
1364
1365 P9_DPRINTK(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1366 qid->type, (unsigned long long)qid->path, qid->version);
1367
1368 free_and_error:
1369 p9_free_req(clnt, req);
1370 error:
1371 return err;
1372 }
1373 EXPORT_SYMBOL(p9_client_symlink);
1374
1375 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1376 {
1377 struct p9_client *clnt;
1378 struct p9_req_t *req;
1379
1380 P9_DPRINTK(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1381 dfid->fid, oldfid->fid, newname);
1382 clnt = dfid->clnt;
1383 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1384 newname);
1385 if (IS_ERR(req))
1386 return PTR_ERR(req);
1387
1388 P9_DPRINTK(P9_DEBUG_9P, "<<< RLINK\n");
1389 p9_free_req(clnt, req);
1390 return 0;
1391 }
1392 EXPORT_SYMBOL(p9_client_link);
1393
1394 int p9_client_fsync(struct p9_fid *fid, int datasync)
1395 {
1396 int err;
1397 struct p9_client *clnt;
1398 struct p9_req_t *req;
1399
1400 P9_DPRINTK(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1401 fid->fid, datasync);
1402 err = 0;
1403 clnt = fid->clnt;
1404
1405 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1406 if (IS_ERR(req)) {
1407 err = PTR_ERR(req);
1408 goto error;
1409 }
1410
1411 P9_DPRINTK(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1412
1413 p9_free_req(clnt, req);
1414
1415 error:
1416 return err;
1417 }
1418 EXPORT_SYMBOL(p9_client_fsync);
1419
1420 int p9_client_clunk(struct p9_fid *fid)
1421 {
1422 int err;
1423 struct p9_client *clnt;
1424 struct p9_req_t *req;
1425
1426 if (!fid) {
1427 P9_EPRINTK(KERN_WARNING, "Trying to clunk with NULL fid\n");
1428 dump_stack();
1429 return 0;
1430 }
1431
1432 P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
1433 err = 0;
1434 clnt = fid->clnt;
1435
1436 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1437 if (IS_ERR(req)) {
1438 err = PTR_ERR(req);
1439 goto error;
1440 }
1441
1442 P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1443
1444 p9_free_req(clnt, req);
1445 error:
1446 /*
1447 * Fid is not valid even after a failed clunk
1448 */
1449 p9_fid_destroy(fid);
1450 return err;
1451 }
1452 EXPORT_SYMBOL(p9_client_clunk);
1453
1454 int p9_client_remove(struct p9_fid *fid)
1455 {
1456 int err;
1457 struct p9_client *clnt;
1458 struct p9_req_t *req;
1459
1460 P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1461 err = 0;
1462 clnt = fid->clnt;
1463
1464 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1465 if (IS_ERR(req)) {
1466 err = PTR_ERR(req);
1467 goto error;
1468 }
1469
1470 P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1471
1472 p9_free_req(clnt, req);
1473 error:
1474 p9_fid_destroy(fid);
1475 return err;
1476 }
1477 EXPORT_SYMBOL(p9_client_remove);
1478
1479 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1480 {
1481 int err = 0;
1482 struct p9_req_t *req;
1483 struct p9_client *clnt;
1484
1485 P9_DPRINTK(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1486 dfid->fid, name, flags);
1487
1488 clnt = dfid->clnt;
1489 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1490 if (IS_ERR(req)) {
1491 err = PTR_ERR(req);
1492 goto error;
1493 }
1494 P9_DPRINTK(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1495
1496 p9_free_req(clnt, req);
1497 error:
1498 return err;
1499 }
1500 EXPORT_SYMBOL(p9_client_unlinkat);
1501
1502 int
1503 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1504 u32 count)
1505 {
1506 char *dataptr;
1507 int kernel_buf = 0;
1508 struct p9_req_t *req;
1509 struct p9_client *clnt;
1510 int err, rsize, non_zc = 0;
1511
1512
1513 P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1514 fid->fid, (long long unsigned) offset, count);
1515 err = 0;
1516 clnt = fid->clnt;
1517
1518 rsize = fid->iounit;
1519 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1520 rsize = clnt->msize - P9_IOHDRSZ;
1521
1522 if (count < rsize)
1523 rsize = count;
1524
1525 /* Don't bother zerocopy for small IO (< 1024) */
1526 if (clnt->trans_mod->zc_request && rsize > 1024) {
1527 char *indata;
1528 if (data) {
1529 kernel_buf = 1;
1530 indata = data;
1531 } else
1532 indata = (char *)udata;
1533 /*
1534 * response header len is 11
1535 * PDU Header(7) + IO Size (4)
1536 */
1537 req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0,
1538 11, kernel_buf, "dqd", fid->fid,
1539 offset, rsize);
1540 } else {
1541 non_zc = 1;
1542 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1543 rsize);
1544 }
1545 if (IS_ERR(req)) {
1546 err = PTR_ERR(req);
1547 goto error;
1548 }
1549
1550 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1551 if (err) {
1552 trace_9p_protocol_dump(clnt, req->rc);
1553 goto free_and_error;
1554 }
1555
1556 P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1557
1558 if (non_zc) {
1559 if (data) {
1560 memmove(data, dataptr, count);
1561 } else {
1562 err = copy_to_user(udata, dataptr, count);
1563 if (err) {
1564 err = -EFAULT;
1565 goto free_and_error;
1566 }
1567 }
1568 }
1569 p9_free_req(clnt, req);
1570 return count;
1571
1572 free_and_error:
1573 p9_free_req(clnt, req);
1574 error:
1575 return err;
1576 }
1577 EXPORT_SYMBOL(p9_client_read);
1578
1579 int
1580 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1581 u64 offset, u32 count)
1582 {
1583 int err, rsize;
1584 int kernel_buf = 0;
1585 struct p9_client *clnt;
1586 struct p9_req_t *req;
1587
1588 P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1589 fid->fid, (long long unsigned) offset, count);
1590 err = 0;
1591 clnt = fid->clnt;
1592
1593 rsize = fid->iounit;
1594 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1595 rsize = clnt->msize - P9_IOHDRSZ;
1596
1597 if (count < rsize)
1598 rsize = count;
1599
1600 /* Don't bother zerocopy for small IO (< 1024) */
1601 if (clnt->trans_mod->zc_request && rsize > 1024) {
1602 char *odata;
1603 if (data) {
1604 kernel_buf = 1;
1605 odata = data;
1606 } else
1607 odata = (char *)udata;
1608 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize,
1609 P9_ZC_HDR_SZ, kernel_buf, "dqd",
1610 fid->fid, offset, rsize);
1611 } else {
1612 if (data)
1613 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
1614 offset, rsize, data);
1615 else
1616 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
1617 offset, rsize, udata);
1618 }
1619 if (IS_ERR(req)) {
1620 err = PTR_ERR(req);
1621 goto error;
1622 }
1623
1624 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1625 if (err) {
1626 trace_9p_protocol_dump(clnt, req->rc);
1627 goto free_and_error;
1628 }
1629
1630 P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1631
1632 p9_free_req(clnt, req);
1633 return count;
1634
1635 free_and_error:
1636 p9_free_req(clnt, req);
1637 error:
1638 return err;
1639 }
1640 EXPORT_SYMBOL(p9_client_write);
1641
1642 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1643 {
1644 int err;
1645 struct p9_client *clnt;
1646 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1647 struct p9_req_t *req;
1648 u16 ignored;
1649
1650 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1651
1652 if (!ret)
1653 return ERR_PTR(-ENOMEM);
1654
1655 err = 0;
1656 clnt = fid->clnt;
1657
1658 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1659 if (IS_ERR(req)) {
1660 err = PTR_ERR(req);
1661 goto error;
1662 }
1663
1664 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1665 if (err) {
1666 trace_9p_protocol_dump(clnt, req->rc);
1667 p9_free_req(clnt, req);
1668 goto error;
1669 }
1670
1671 P9_DPRINTK(P9_DEBUG_9P,
1672 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1673 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1674 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1675 "<<< uid=%d gid=%d n_muid=%d\n",
1676 ret->size, ret->type, ret->dev, ret->qid.type,
1677 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1678 ret->atime, ret->mtime, (unsigned long long)ret->length,
1679 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1680 ret->n_uid, ret->n_gid, ret->n_muid);
1681
1682 p9_free_req(clnt, req);
1683 return ret;
1684
1685 error:
1686 kfree(ret);
1687 return ERR_PTR(err);
1688 }
1689 EXPORT_SYMBOL(p9_client_stat);
1690
1691 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1692 u64 request_mask)
1693 {
1694 int err;
1695 struct p9_client *clnt;
1696 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1697 GFP_KERNEL);
1698 struct p9_req_t *req;
1699
1700 P9_DPRINTK(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1701 fid->fid, request_mask);
1702
1703 if (!ret)
1704 return ERR_PTR(-ENOMEM);
1705
1706 err = 0;
1707 clnt = fid->clnt;
1708
1709 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1710 if (IS_ERR(req)) {
1711 err = PTR_ERR(req);
1712 goto error;
1713 }
1714
1715 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1716 if (err) {
1717 trace_9p_protocol_dump(clnt, req->rc);
1718 p9_free_req(clnt, req);
1719 goto error;
1720 }
1721
1722 P9_DPRINTK(P9_DEBUG_9P,
1723 "<<< RGETATTR st_result_mask=%lld\n"
1724 "<<< qid=%x.%llx.%x\n"
1725 "<<< st_mode=%8.8x st_nlink=%llu\n"
1726 "<<< st_uid=%d st_gid=%d\n"
1727 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1728 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1729 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1730 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1731 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1732 "<<< st_gen=%lld st_data_version=%lld",
1733 ret->st_result_mask, ret->qid.type, ret->qid.path,
1734 ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid,
1735 ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize,
1736 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1737 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1738 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1739 ret->st_gen, ret->st_data_version);
1740
1741 p9_free_req(clnt, req);
1742 return ret;
1743
1744 error:
1745 kfree(ret);
1746 return ERR_PTR(err);
1747 }
1748 EXPORT_SYMBOL(p9_client_getattr_dotl);
1749
1750 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1751 {
1752 int ret;
1753
1754 /* NOTE: size shouldn't include its own length */
1755 /* size[2] type[2] dev[4] qid[13] */
1756 /* mode[4] atime[4] mtime[4] length[8]*/
1757 /* name[s] uid[s] gid[s] muid[s] */
1758 ret = 2+4+13+4+4+4+8+2+2+2+2;
1759
1760 if (wst->name)
1761 ret += strlen(wst->name);
1762 if (wst->uid)
1763 ret += strlen(wst->uid);
1764 if (wst->gid)
1765 ret += strlen(wst->gid);
1766 if (wst->muid)
1767 ret += strlen(wst->muid);
1768
1769 if ((proto_version == p9_proto_2000u) ||
1770 (proto_version == p9_proto_2000L)) {
1771 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1772 if (wst->extension)
1773 ret += strlen(wst->extension);
1774 }
1775
1776 return ret;
1777 }
1778
1779 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1780 {
1781 int err;
1782 struct p9_req_t *req;
1783 struct p9_client *clnt;
1784
1785 err = 0;
1786 clnt = fid->clnt;
1787 wst->size = p9_client_statsize(wst, clnt->proto_version);
1788 P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1789 P9_DPRINTK(P9_DEBUG_9P,
1790 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1791 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1792 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1793 " uid=%d gid=%d n_muid=%d\n",
1794 wst->size, wst->type, wst->dev, wst->qid.type,
1795 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1796 wst->atime, wst->mtime, (unsigned long long)wst->length,
1797 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1798 wst->n_uid, wst->n_gid, wst->n_muid);
1799
1800 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1801 if (IS_ERR(req)) {
1802 err = PTR_ERR(req);
1803 goto error;
1804 }
1805
1806 P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1807
1808 p9_free_req(clnt, req);
1809 error:
1810 return err;
1811 }
1812 EXPORT_SYMBOL(p9_client_wstat);
1813
1814 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1815 {
1816 int err;
1817 struct p9_req_t *req;
1818 struct p9_client *clnt;
1819
1820 err = 0;
1821 clnt = fid->clnt;
1822 P9_DPRINTK(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1823 P9_DPRINTK(P9_DEBUG_9P,
1824 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1825 " atime_sec=%lld atime_nsec=%lld\n"
1826 " mtime_sec=%lld mtime_nsec=%lld\n",
1827 p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid,
1828 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1829 p9attr->mtime_sec, p9attr->mtime_nsec);
1830
1831 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1832
1833 if (IS_ERR(req)) {
1834 err = PTR_ERR(req);
1835 goto error;
1836 }
1837 P9_DPRINTK(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1838 p9_free_req(clnt, req);
1839 error:
1840 return err;
1841 }
1842 EXPORT_SYMBOL(p9_client_setattr);
1843
1844 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1845 {
1846 int err;
1847 struct p9_req_t *req;
1848 struct p9_client *clnt;
1849
1850 err = 0;
1851 clnt = fid->clnt;
1852
1853 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1854
1855 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1856 if (IS_ERR(req)) {
1857 err = PTR_ERR(req);
1858 goto error;
1859 }
1860
1861 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1862 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1863 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1864 if (err) {
1865 trace_9p_protocol_dump(clnt, req->rc);
1866 p9_free_req(clnt, req);
1867 goto error;
1868 }
1869
1870 P9_DPRINTK(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1871 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1872 "fsid %llu namelen %ld\n",
1873 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1874 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1875 sb->fsid, (long int)sb->namelen);
1876
1877 p9_free_req(clnt, req);
1878 error:
1879 return err;
1880 }
1881 EXPORT_SYMBOL(p9_client_statfs);
1882
1883 int p9_client_rename(struct p9_fid *fid,
1884 struct p9_fid *newdirfid, const char *name)
1885 {
1886 int err;
1887 struct p9_req_t *req;
1888 struct p9_client *clnt;
1889
1890 err = 0;
1891 clnt = fid->clnt;
1892
1893 P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1894 fid->fid, newdirfid->fid, name);
1895
1896 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1897 newdirfid->fid, name);
1898 if (IS_ERR(req)) {
1899 err = PTR_ERR(req);
1900 goto error;
1901 }
1902
1903 P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1904
1905 p9_free_req(clnt, req);
1906 error:
1907 return err;
1908 }
1909 EXPORT_SYMBOL(p9_client_rename);
1910
1911 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1912 struct p9_fid *newdirfid, const char *new_name)
1913 {
1914 int err;
1915 struct p9_req_t *req;
1916 struct p9_client *clnt;
1917
1918 err = 0;
1919 clnt = olddirfid->clnt;
1920
1921 P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1922 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1923 newdirfid->fid, new_name);
1924
1925 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1926 old_name, newdirfid->fid, new_name);
1927 if (IS_ERR(req)) {
1928 err = PTR_ERR(req);
1929 goto error;
1930 }
1931
1932 P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1933 newdirfid->fid, new_name);
1934
1935 p9_free_req(clnt, req);
1936 error:
1937 return err;
1938 }
1939 EXPORT_SYMBOL(p9_client_renameat);
1940
1941 /*
1942 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1943 */
1944 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1945 const char *attr_name, u64 *attr_size)
1946 {
1947 int err;
1948 struct p9_req_t *req;
1949 struct p9_client *clnt;
1950 struct p9_fid *attr_fid;
1951
1952 err = 0;
1953 clnt = file_fid->clnt;
1954 attr_fid = p9_fid_create(clnt);
1955 if (IS_ERR(attr_fid)) {
1956 err = PTR_ERR(attr_fid);
1957 attr_fid = NULL;
1958 goto error;
1959 }
1960 P9_DPRINTK(P9_DEBUG_9P,
1961 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
1962 file_fid->fid, attr_fid->fid, attr_name);
1963
1964 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
1965 file_fid->fid, attr_fid->fid, attr_name);
1966 if (IS_ERR(req)) {
1967 err = PTR_ERR(req);
1968 goto error;
1969 }
1970 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
1971 if (err) {
1972 trace_9p_protocol_dump(clnt, req->rc);
1973 p9_free_req(clnt, req);
1974 goto clunk_fid;
1975 }
1976 p9_free_req(clnt, req);
1977 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
1978 attr_fid->fid, *attr_size);
1979 return attr_fid;
1980 clunk_fid:
1981 p9_client_clunk(attr_fid);
1982 attr_fid = NULL;
1983 error:
1984 if (attr_fid && (attr_fid != file_fid))
1985 p9_fid_destroy(attr_fid);
1986
1987 return ERR_PTR(err);
1988 }
1989 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
1990
1991 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
1992 u64 attr_size, int flags)
1993 {
1994 int err;
1995 struct p9_req_t *req;
1996 struct p9_client *clnt;
1997
1998 P9_DPRINTK(P9_DEBUG_9P,
1999 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2000 fid->fid, name, (long long)attr_size, flags);
2001 err = 0;
2002 clnt = fid->clnt;
2003 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2004 fid->fid, name, attr_size, flags);
2005 if (IS_ERR(req)) {
2006 err = PTR_ERR(req);
2007 goto error;
2008 }
2009 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2010 p9_free_req(clnt, req);
2011 error:
2012 return err;
2013 }
2014 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2015
2016 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2017 {
2018 int err, rsize, non_zc = 0;
2019 struct p9_client *clnt;
2020 struct p9_req_t *req;
2021 char *dataptr;
2022
2023 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2024 fid->fid, (long long unsigned) offset, count);
2025
2026 err = 0;
2027 clnt = fid->clnt;
2028
2029 rsize = fid->iounit;
2030 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2031 rsize = clnt->msize - P9_READDIRHDRSZ;
2032
2033 if (count < rsize)
2034 rsize = count;
2035
2036 /* Don't bother zerocopy for small IO (< 1024) */
2037 if (clnt->trans_mod->zc_request && rsize > 1024) {
2038 /*
2039 * response header len is 11
2040 * PDU Header(7) + IO Size (4)
2041 */
2042 req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0,
2043 11, 1, "dqd", fid->fid, offset, rsize);
2044 } else {
2045 non_zc = 1;
2046 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2047 offset, rsize);
2048 }
2049 if (IS_ERR(req)) {
2050 err = PTR_ERR(req);
2051 goto error;
2052 }
2053
2054 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2055 if (err) {
2056 trace_9p_protocol_dump(clnt, req->rc);
2057 goto free_and_error;
2058 }
2059
2060 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2061
2062 if (non_zc)
2063 memmove(data, dataptr, count);
2064
2065 p9_free_req(clnt, req);
2066 return count;
2067
2068 free_and_error:
2069 p9_free_req(clnt, req);
2070 error:
2071 return err;
2072 }
2073 EXPORT_SYMBOL(p9_client_readdir);
2074
2075 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
2076 dev_t rdev, gid_t gid, struct p9_qid *qid)
2077 {
2078 int err;
2079 struct p9_client *clnt;
2080 struct p9_req_t *req;
2081
2082 err = 0;
2083 clnt = fid->clnt;
2084 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2085 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2086 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode,
2087 MAJOR(rdev), MINOR(rdev), gid);
2088 if (IS_ERR(req))
2089 return PTR_ERR(req);
2090
2091 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2092 if (err) {
2093 trace_9p_protocol_dump(clnt, req->rc);
2094 goto error;
2095 }
2096 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2097 (unsigned long long)qid->path, qid->version);
2098
2099 error:
2100 p9_free_req(clnt, req);
2101 return err;
2102
2103 }
2104 EXPORT_SYMBOL(p9_client_mknod_dotl);
2105
2106 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
2107 gid_t gid, struct p9_qid *qid)
2108 {
2109 int err;
2110 struct p9_client *clnt;
2111 struct p9_req_t *req;
2112
2113 err = 0;
2114 clnt = fid->clnt;
2115 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2116 fid->fid, name, mode, gid);
2117 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode,
2118 gid);
2119 if (IS_ERR(req))
2120 return PTR_ERR(req);
2121
2122 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2123 if (err) {
2124 trace_9p_protocol_dump(clnt, req->rc);
2125 goto error;
2126 }
2127 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2128 (unsigned long long)qid->path, qid->version);
2129
2130 error:
2131 p9_free_req(clnt, req);
2132 return err;
2133
2134 }
2135 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2136
2137 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2138 {
2139 int err;
2140 struct p9_client *clnt;
2141 struct p9_req_t *req;
2142
2143 err = 0;
2144 clnt = fid->clnt;
2145 P9_DPRINTK(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2146 "start %lld length %lld proc_id %d client_id %s\n",
2147 fid->fid, flock->type, flock->flags, flock->start,
2148 flock->length, flock->proc_id, flock->client_id);
2149
2150 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2151 flock->flags, flock->start, flock->length,
2152 flock->proc_id, flock->client_id);
2153
2154 if (IS_ERR(req))
2155 return PTR_ERR(req);
2156
2157 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2158 if (err) {
2159 trace_9p_protocol_dump(clnt, req->rc);
2160 goto error;
2161 }
2162 P9_DPRINTK(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2163 error:
2164 p9_free_req(clnt, req);
2165 return err;
2166
2167 }
2168 EXPORT_SYMBOL(p9_client_lock_dotl);
2169
2170 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2171 {
2172 int err;
2173 struct p9_client *clnt;
2174 struct p9_req_t *req;
2175
2176 err = 0;
2177 clnt = fid->clnt;
2178 P9_DPRINTK(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2179 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2180 glock->start, glock->length, glock->proc_id, glock->client_id);
2181
2182 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2183 glock->start, glock->length, glock->proc_id, glock->client_id);
2184
2185 if (IS_ERR(req))
2186 return PTR_ERR(req);
2187
2188 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2189 &glock->start, &glock->length, &glock->proc_id,
2190 &glock->client_id);
2191 if (err) {
2192 trace_9p_protocol_dump(clnt, req->rc);
2193 goto error;
2194 }
2195 P9_DPRINTK(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2196 "proc_id %d client_id %s\n", glock->type, glock->start,
2197 glock->length, glock->proc_id, glock->client_id);
2198 error:
2199 p9_free_req(clnt, req);
2200 return err;
2201 }
2202 EXPORT_SYMBOL(p9_client_getlock_dotl);
2203
2204 int p9_client_readlink(struct p9_fid *fid, char **target)
2205 {
2206 int err;
2207 struct p9_client *clnt;
2208 struct p9_req_t *req;
2209
2210 err = 0;
2211 clnt = fid->clnt;
2212 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2213
2214 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2215 if (IS_ERR(req))
2216 return PTR_ERR(req);
2217
2218 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2219 if (err) {
2220 trace_9p_protocol_dump(clnt, req->rc);
2221 goto error;
2222 }
2223 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2224 error:
2225 p9_free_req(clnt, req);
2226 return err;
2227 }
2228 EXPORT_SYMBOL(p9_client_readlink);
linux-next