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leds: renesas: fix error handling
[linux-2.6/btrfs-unstable.git] / net / 9p / client.c
blob8260f132b32e0a9d706c38b0969d0879a3f6bf94
1 /*
2 * net/9p/clnt.c
3 *
4 * 9P Client
5 *
6 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to:
20 * Free Software Foundation
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02111-1301 USA
23 *
24 */
25
26 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
27
28 #include <linux/module.h>
29 #include <linux/errno.h>
30 #include <linux/fs.h>
31 #include <linux/poll.h>
32 #include <linux/idr.h>
33 #include <linux/mutex.h>
34 #include <linux/slab.h>
35 #include <linux/sched.h>
36 #include <linux/uaccess.h>
37 #include <net/9p/9p.h>
38 #include <linux/parser.h>
39 #include <net/9p/client.h>
40 #include <net/9p/transport.h>
41 #include "protocol.h"
42
43 #define CREATE_TRACE_POINTS
44 #include <trace/events/9p.h>
45
46 /*
47 * Client Option Parsing (code inspired by NFS code)
48 * - a little lazy - parse all client options
49 */
50
51 enum {
52 Opt_msize,
53 Opt_trans,
54 Opt_legacy,
55 Opt_version,
56 Opt_err,
57 };
58
59 static const match_table_t tokens = {
60 {Opt_msize, "msize=%u"},
61 {Opt_legacy, "noextend"},
62 {Opt_trans, "trans=%s"},
63 {Opt_version, "version=%s"},
64 {Opt_err, NULL},
65 };
66
67 inline int p9_is_proto_dotl(struct p9_client *clnt)
68 {
69 return clnt->proto_version == p9_proto_2000L;
70 }
71 EXPORT_SYMBOL(p9_is_proto_dotl);
72
73 inline int p9_is_proto_dotu(struct p9_client *clnt)
74 {
75 return clnt->proto_version == p9_proto_2000u;
76 }
77 EXPORT_SYMBOL(p9_is_proto_dotu);
78
79 /* Interpret mount option for protocol version */
80 static int get_protocol_version(char *s)
81 {
82 int version = -EINVAL;
83
84 if (!strcmp(s, "9p2000")) {
85 version = p9_proto_legacy;
86 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n");
87 } else if (!strcmp(s, "9p2000.u")) {
88 version = p9_proto_2000u;
89 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
90 } else if (!strcmp(s, "9p2000.L")) {
91 version = p9_proto_2000L;
92 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
93 } else
94 pr_info("Unknown protocol version %s\n", s);
95
96 return version;
97 }
98
99 /**
100 * parse_options - parse mount options into client structure
101 * @opts: options string passed from mount
102 * @clnt: existing v9fs client information
103 *
104 * Return 0 upon success, -ERRNO upon failure
105 */
106
107 static int parse_opts(char *opts, struct p9_client *clnt)
108 {
109 char *options, *tmp_options;
110 char *p;
111 substring_t args[MAX_OPT_ARGS];
112 int option;
113 char *s;
114 int ret = 0;
115
116 clnt->proto_version = p9_proto_2000u;
117 clnt->msize = 8192;
118
119 if (!opts)
120 return 0;
121
122 tmp_options = kstrdup(opts, GFP_KERNEL);
123 if (!tmp_options) {
124 p9_debug(P9_DEBUG_ERROR,
125 "failed to allocate copy of option string\n");
126 return -ENOMEM;
127 }
128 options = tmp_options;
129
130 while ((p = strsep(&options, ",")) != NULL) {
131 int token, r;
132 if (!*p)
133 continue;
134 token = match_token(p, tokens, args);
135 switch (token) {
136 case Opt_msize:
137 r = match_int(&args[0], &option);
138 if (r < 0) {
139 p9_debug(P9_DEBUG_ERROR,
140 "integer field, but no integer?\n");
141 ret = r;
142 continue;
143 }
144 clnt->msize = option;
145 break;
146 case Opt_trans:
147 s = match_strdup(&args[0]);
148 if (!s) {
149 ret = -ENOMEM;
150 p9_debug(P9_DEBUG_ERROR,
151 "problem allocating copy of trans arg\n");
152 goto free_and_return;
153 }
154 clnt->trans_mod = v9fs_get_trans_by_name(s);
155 if (clnt->trans_mod == NULL) {
156 pr_info("Could not find request transport: %s\n",
157 s);
158 ret = -EINVAL;
159 kfree(s);
160 goto free_and_return;
161 }
162 kfree(s);
163 break;
164 case Opt_legacy:
165 clnt->proto_version = p9_proto_legacy;
166 break;
167 case Opt_version:
168 s = match_strdup(&args[0]);
169 if (!s) {
170 ret = -ENOMEM;
171 p9_debug(P9_DEBUG_ERROR,
172 "problem allocating copy of version arg\n");
173 goto free_and_return;
174 }
175 ret = get_protocol_version(s);
176 if (ret == -EINVAL) {
177 kfree(s);
178 goto free_and_return;
179 }
180 kfree(s);
181 clnt->proto_version = ret;
182 break;
183 default:
184 continue;
185 }
186 }
187
188 free_and_return:
189 kfree(tmp_options);
190 return ret;
191 }
192
193 /**
194 * p9_tag_alloc - lookup/allocate a request by tag
195 * @c: client session to lookup tag within
196 * @tag: numeric id for transaction
197 *
198 * this is a simple array lookup, but will grow the
199 * request_slots as necessary to accommodate transaction
200 * ids which did not previously have a slot.
201 *
202 * this code relies on the client spinlock to manage locks, its
203 * possible we should switch to something else, but I'd rather
204 * stick with something low-overhead for the common case.
205 *
206 */
207
208 static struct p9_req_t *
209 p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
210 {
211 unsigned long flags;
212 int row, col;
213 struct p9_req_t *req;
214 int alloc_msize = min(c->msize, max_size);
215
216 /* This looks up the original request by tag so we know which
217 * buffer to read the data into */
218 tag++;
219
220 if (tag >= c->max_tag) {
221 spin_lock_irqsave(&c->lock, flags);
222 /* check again since original check was outside of lock */
223 while (tag >= c->max_tag) {
224 row = (tag / P9_ROW_MAXTAG);
225 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
226 sizeof(struct p9_req_t), GFP_ATOMIC);
227
228 if (!c->reqs[row]) {
229 pr_err("Couldn't grow tag array\n");
230 spin_unlock_irqrestore(&c->lock, flags);
231 return ERR_PTR(-ENOMEM);
232 }
233 for (col = 0; col < P9_ROW_MAXTAG; col++) {
234 c->reqs[row][col].status = REQ_STATUS_IDLE;
235 c->reqs[row][col].tc = NULL;
236 }
237 c->max_tag += P9_ROW_MAXTAG;
238 }
239 spin_unlock_irqrestore(&c->lock, flags);
240 }
241 row = tag / P9_ROW_MAXTAG;
242 col = tag % P9_ROW_MAXTAG;
243
244 req = &c->reqs[row][col];
245 if (!req->tc) {
246 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
247 if (!req->wq) {
248 pr_err("Couldn't grow tag array\n");
249 return ERR_PTR(-ENOMEM);
250 }
251 init_waitqueue_head(req->wq);
252 req->tc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
253 GFP_NOFS);
254 req->rc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
255 GFP_NOFS);
256 if ((!req->tc) || (!req->rc)) {
257 pr_err("Couldn't grow tag array\n");
258 kfree(req->tc);
259 kfree(req->rc);
260 kfree(req->wq);
261 req->tc = req->rc = NULL;
262 req->wq = NULL;
263 return ERR_PTR(-ENOMEM);
264 }
265 req->tc->capacity = alloc_msize;
266 req->rc->capacity = alloc_msize;
267 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
268 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
269 }
270
271 p9pdu_reset(req->tc);
272 p9pdu_reset(req->rc);
273
274 req->tc->tag = tag-1;
275 req->status = REQ_STATUS_ALLOC;
276
277 return &c->reqs[row][col];
278 }
279
280 /**
281 * p9_tag_lookup - lookup a request by tag
282 * @c: client session to lookup tag within
283 * @tag: numeric id for transaction
284 *
285 */
286
287 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
288 {
289 int row, col;
290
291 /* This looks up the original request by tag so we know which
292 * buffer to read the data into */
293 tag++;
294
295 if(tag >= c->max_tag)
296 return NULL;
297
298 row = tag / P9_ROW_MAXTAG;
299 col = tag % P9_ROW_MAXTAG;
300
301 return &c->reqs[row][col];
302 }
303 EXPORT_SYMBOL(p9_tag_lookup);
304
305 /**
306 * p9_tag_init - setup tags structure and contents
307 * @c: v9fs client struct
308 *
309 * This initializes the tags structure for each client instance.
310 *
311 */
312
313 static int p9_tag_init(struct p9_client *c)
314 {
315 int err = 0;
316
317 c->tagpool = p9_idpool_create();
318 if (IS_ERR(c->tagpool)) {
319 err = PTR_ERR(c->tagpool);
320 goto error;
321 }
322 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
323 if (err < 0) {
324 p9_idpool_destroy(c->tagpool);
325 goto error;
326 }
327 c->max_tag = 0;
328 error:
329 return err;
330 }
331
332 /**
333 * p9_tag_cleanup - cleans up tags structure and reclaims resources
334 * @c: v9fs client struct
335 *
336 * This frees resources associated with the tags structure
337 *
338 */
339 static void p9_tag_cleanup(struct p9_client *c)
340 {
341 int row, col;
342
343 /* check to insure all requests are idle */
344 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
345 for (col = 0; col < P9_ROW_MAXTAG; col++) {
346 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
347 p9_debug(P9_DEBUG_MUX,
348 "Attempting to cleanup non-free tag %d,%d\n",
349 row, col);
350 /* TODO: delay execution of cleanup */
351 return;
352 }
353 }
354 }
355
356 if (c->tagpool) {
357 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
358 p9_idpool_destroy(c->tagpool);
359 }
360
361 /* free requests associated with tags */
362 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
363 for (col = 0; col < P9_ROW_MAXTAG; col++) {
364 kfree(c->reqs[row][col].wq);
365 kfree(c->reqs[row][col].tc);
366 kfree(c->reqs[row][col].rc);
367 }
368 kfree(c->reqs[row]);
369 }
370 c->max_tag = 0;
371 }
372
373 /**
374 * p9_free_req - free a request and clean-up as necessary
375 * c: client state
376 * r: request to release
377 *
378 */
379
380 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
381 {
382 int tag = r->tc->tag;
383 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
384
385 r->status = REQ_STATUS_IDLE;
386 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
387 p9_idpool_put(tag, c->tagpool);
388 }
389
390 /**
391 * p9_client_cb - call back from transport to client
392 * c: client state
393 * req: request received
394 *
395 */
396 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
397 {
398 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
399 wake_up(req->wq);
400 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
401 }
402 EXPORT_SYMBOL(p9_client_cb);
403
404 /**
405 * p9_parse_header - parse header arguments out of a packet
406 * @pdu: packet to parse
407 * @size: size of packet
408 * @type: type of request
409 * @tag: tag of packet
410 * @rewind: set if we need to rewind offset afterwards
411 */
412
413 int
414 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
415 int rewind)
416 {
417 int8_t r_type;
418 int16_t r_tag;
419 int32_t r_size;
420 int offset = pdu->offset;
421 int err;
422
423 pdu->offset = 0;
424 if (pdu->size == 0)
425 pdu->size = 7;
426
427 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
428 if (err)
429 goto rewind_and_exit;
430
431 pdu->size = r_size;
432 pdu->id = r_type;
433 pdu->tag = r_tag;
434
435 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
436 pdu->size, pdu->id, pdu->tag);
437
438 if (type)
439 *type = r_type;
440 if (tag)
441 *tag = r_tag;
442 if (size)
443 *size = r_size;
444
445
446 rewind_and_exit:
447 if (rewind)
448 pdu->offset = offset;
449 return err;
450 }
451 EXPORT_SYMBOL(p9_parse_header);
452
453 /**
454 * p9_check_errors - check 9p packet for error return and process it
455 * @c: current client instance
456 * @req: request to parse and check for error conditions
457 *
458 * returns error code if one is discovered, otherwise returns 0
459 *
460 * this will have to be more complicated if we have multiple
461 * error packet types
462 */
463
464 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
465 {
466 int8_t type;
467 int err;
468 int ecode;
469
470 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
471 /*
472 * dump the response from server
473 * This should be after check errors which poplulate pdu_fcall.
474 */
475 trace_9p_protocol_dump(c, req->rc);
476 if (err) {
477 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
478 return err;
479 }
480 if (type != P9_RERROR && type != P9_RLERROR)
481 return 0;
482
483 if (!p9_is_proto_dotl(c)) {
484 char *ename;
485 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
486 &ename, &ecode);
487 if (err)
488 goto out_err;
489
490 if (p9_is_proto_dotu(c))
491 err = -ecode;
492
493 if (!err || !IS_ERR_VALUE(err)) {
494 err = p9_errstr2errno(ename, strlen(ename));
495
496 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
497 -ecode, ename);
498 }
499 kfree(ename);
500 } else {
501 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
502 err = -ecode;
503
504 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
505 }
506
507 return err;
508
509 out_err:
510 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
511
512 return err;
513 }
514
515 /**
516 * p9_check_zc_errors - check 9p packet for error return and process it
517 * @c: current client instance
518 * @req: request to parse and check for error conditions
519 * @in_hdrlen: Size of response protocol buffer.
520 *
521 * returns error code if one is discovered, otherwise returns 0
522 *
523 * this will have to be more complicated if we have multiple
524 * error packet types
525 */
526
527 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
528 char *uidata, int in_hdrlen, int kern_buf)
529 {
530 int err;
531 int ecode;
532 int8_t type;
533 char *ename = NULL;
534
535 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
536 /*
537 * dump the response from server
538 * This should be after parse_header which poplulate pdu_fcall.
539 */
540 trace_9p_protocol_dump(c, req->rc);
541 if (err) {
542 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
543 return err;
544 }
545
546 if (type != P9_RERROR && type != P9_RLERROR)
547 return 0;
548
549 if (!p9_is_proto_dotl(c)) {
550 /* Error is reported in string format */
551 uint16_t len;
552 /* 7 = header size for RERROR, 2 is the size of string len; */
553 int inline_len = in_hdrlen - (7 + 2);
554
555 /* Read the size of error string */
556 err = p9pdu_readf(req->rc, c->proto_version, "w", &len);
557 if (err)
558 goto out_err;
559
560 ename = kmalloc(len + 1, GFP_NOFS);
561 if (!ename) {
562 err = -ENOMEM;
563 goto out_err;
564 }
565 if (len <= inline_len) {
566 /* We have error in protocol buffer itself */
567 if (pdu_read(req->rc, ename, len)) {
568 err = -EFAULT;
569 goto out_free;
570
571 }
572 } else {
573 /*
574 * Part of the data is in user space buffer.
575 */
576 if (pdu_read(req->rc, ename, inline_len)) {
577 err = -EFAULT;
578 goto out_free;
579
580 }
581 if (kern_buf) {
582 memcpy(ename + inline_len, uidata,
583 len - inline_len);
584 } else {
585 err = copy_from_user(ename + inline_len,
586 uidata, len - inline_len);
587 if (err) {
588 err = -EFAULT;
589 goto out_free;
590 }
591 }
592 }
593 ename[len] = 0;
594 if (p9_is_proto_dotu(c)) {
595 /* For dotu we also have error code */
596 err = p9pdu_readf(req->rc,
597 c->proto_version, "d", &ecode);
598 if (err)
599 goto out_free;
600 err = -ecode;
601 }
602 if (!err || !IS_ERR_VALUE(err)) {
603 err = p9_errstr2errno(ename, strlen(ename));
604
605 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
606 -ecode, ename);
607 }
608 kfree(ename);
609 } else {
610 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
611 err = -ecode;
612
613 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
614 }
615 return err;
616
617 out_free:
618 kfree(ename);
619 out_err:
620 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
621 return err;
622 }
623
624 static struct p9_req_t *
625 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
626
627 /**
628 * p9_client_flush - flush (cancel) a request
629 * @c: client state
630 * @oldreq: request to cancel
631 *
632 * This sents a flush for a particular request and links
633 * the flush request to the original request. The current
634 * code only supports a single flush request although the protocol
635 * allows for multiple flush requests to be sent for a single request.
636 *
637 */
638
639 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
640 {
641 struct p9_req_t *req;
642 int16_t oldtag;
643 int err;
644
645 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
646 if (err)
647 return err;
648
649 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
650
651 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
652 if (IS_ERR(req))
653 return PTR_ERR(req);
654
655
656 /* if we haven't received a response for oldreq,
657 remove it from the list. */
658 spin_lock(&c->lock);
659 if (oldreq->status == REQ_STATUS_FLSH)
660 list_del(&oldreq->req_list);
661 spin_unlock(&c->lock);
662
663 p9_free_req(c, req);
664 return 0;
665 }
666
667 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
668 int8_t type, int req_size,
669 const char *fmt, va_list ap)
670 {
671 int tag, err;
672 struct p9_req_t *req;
673
674 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
675
676 /* we allow for any status other than disconnected */
677 if (c->status == Disconnected)
678 return ERR_PTR(-EIO);
679
680 /* if status is begin_disconnected we allow only clunk request */
681 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
682 return ERR_PTR(-EIO);
683
684 tag = P9_NOTAG;
685 if (type != P9_TVERSION) {
686 tag = p9_idpool_get(c->tagpool);
687 if (tag < 0)
688 return ERR_PTR(-ENOMEM);
689 }
690
691 req = p9_tag_alloc(c, tag, req_size);
692 if (IS_ERR(req))
693 return req;
694
695 /* marshall the data */
696 p9pdu_prepare(req->tc, tag, type);
697 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
698 if (err)
699 goto reterr;
700 p9pdu_finalize(c, req->tc);
701 trace_9p_client_req(c, type, tag);
702 return req;
703 reterr:
704 p9_free_req(c, req);
705 return ERR_PTR(err);
706 }
707
708 /**
709 * p9_client_rpc - issue a request and wait for a response
710 * @c: client session
711 * @type: type of request
712 * @fmt: protocol format string (see protocol.c)
713 *
714 * Returns request structure (which client must free using p9_free_req)
715 */
716
717 static struct p9_req_t *
718 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
719 {
720 va_list ap;
721 int sigpending, err;
722 unsigned long flags;
723 struct p9_req_t *req;
724
725 va_start(ap, fmt);
726 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
727 va_end(ap);
728 if (IS_ERR(req))
729 return req;
730
731 if (signal_pending(current)) {
732 sigpending = 1;
733 clear_thread_flag(TIF_SIGPENDING);
734 } else
735 sigpending = 0;
736
737 err = c->trans_mod->request(c, req);
738 if (err < 0) {
739 if (err != -ERESTARTSYS && err != -EFAULT)
740 c->status = Disconnected;
741 goto reterr;
742 }
743 again:
744 /* Wait for the response */
745 err = wait_event_interruptible(*req->wq,
746 req->status >= REQ_STATUS_RCVD);
747
748 if ((err == -ERESTARTSYS) && (c->status == Connected)
749 && (type == P9_TFLUSH)) {
750 sigpending = 1;
751 clear_thread_flag(TIF_SIGPENDING);
752 goto again;
753 }
754
755 if (req->status == REQ_STATUS_ERROR) {
756 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
757 err = req->t_err;
758 }
759 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
760 p9_debug(P9_DEBUG_MUX, "flushing\n");
761 sigpending = 1;
762 clear_thread_flag(TIF_SIGPENDING);
763
764 if (c->trans_mod->cancel(c, req))
765 p9_client_flush(c, req);
766
767 /* if we received the response anyway, don't signal error */
768 if (req->status == REQ_STATUS_RCVD)
769 err = 0;
770 }
771 if (sigpending) {
772 spin_lock_irqsave(&current->sighand->siglock, flags);
773 recalc_sigpending();
774 spin_unlock_irqrestore(&current->sighand->siglock, flags);
775 }
776 if (err < 0)
777 goto reterr;
778
779 err = p9_check_errors(c, req);
780 trace_9p_client_res(c, type, req->rc->tag, err);
781 if (!err)
782 return req;
783 reterr:
784 p9_free_req(c, req);
785 return ERR_PTR(err);
786 }
787
788 /**
789 * p9_client_zc_rpc - issue a request and wait for a response
790 * @c: client session
791 * @type: type of request
792 * @uidata: user bffer that should be ued for zero copy read
793 * @uodata: user buffer that shoud be user for zero copy write
794 * @inlen: read buffer size
795 * @olen: write buffer size
796 * @hdrlen: reader header size, This is the size of response protocol data
797 * @fmt: protocol format string (see protocol.c)
798 *
799 * Returns request structure (which client must free using p9_free_req)
800 */
801 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
802 char *uidata, char *uodata,
803 int inlen, int olen, int in_hdrlen,
804 int kern_buf, const char *fmt, ...)
805 {
806 va_list ap;
807 int sigpending, err;
808 unsigned long flags;
809 struct p9_req_t *req;
810
811 va_start(ap, fmt);
812 /*
813 * We allocate a inline protocol data of only 4k bytes.
814 * The actual content is passed in zero-copy fashion.
815 */
816 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
817 va_end(ap);
818 if (IS_ERR(req))
819 return req;
820
821 if (signal_pending(current)) {
822 sigpending = 1;
823 clear_thread_flag(TIF_SIGPENDING);
824 } else
825 sigpending = 0;
826
827 /* If we are called with KERNEL_DS force kern_buf */
828 if (segment_eq(get_fs(), KERNEL_DS))
829 kern_buf = 1;
830
831 err = c->trans_mod->zc_request(c, req, uidata, uodata,
832 inlen, olen, in_hdrlen, kern_buf);
833 if (err < 0) {
834 if (err == -EIO)
835 c->status = Disconnected;
836 goto reterr;
837 }
838 if (req->status == REQ_STATUS_ERROR) {
839 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
840 err = req->t_err;
841 }
842 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
843 p9_debug(P9_DEBUG_MUX, "flushing\n");
844 sigpending = 1;
845 clear_thread_flag(TIF_SIGPENDING);
846
847 if (c->trans_mod->cancel(c, req))
848 p9_client_flush(c, req);
849
850 /* if we received the response anyway, don't signal error */
851 if (req->status == REQ_STATUS_RCVD)
852 err = 0;
853 }
854 if (sigpending) {
855 spin_lock_irqsave(&current->sighand->siglock, flags);
856 recalc_sigpending();
857 spin_unlock_irqrestore(&current->sighand->siglock, flags);
858 }
859 if (err < 0)
860 goto reterr;
861
862 err = p9_check_zc_errors(c, req, uidata, in_hdrlen, kern_buf);
863 trace_9p_client_res(c, type, req->rc->tag, err);
864 if (!err)
865 return req;
866 reterr:
867 p9_free_req(c, req);
868 return ERR_PTR(err);
869 }
870
871 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
872 {
873 int ret;
874 struct p9_fid *fid;
875 unsigned long flags;
876
877 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
878 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
879 if (!fid)
880 return ERR_PTR(-ENOMEM);
881
882 ret = p9_idpool_get(clnt->fidpool);
883 if (ret < 0) {
884 ret = -ENOSPC;
885 goto error;
886 }
887 fid->fid = ret;
888
889 memset(&fid->qid, 0, sizeof(struct p9_qid));
890 fid->mode = -1;
891 fid->uid = current_fsuid();
892 fid->clnt = clnt;
893 fid->rdir = NULL;
894 spin_lock_irqsave(&clnt->lock, flags);
895 list_add(&fid->flist, &clnt->fidlist);
896 spin_unlock_irqrestore(&clnt->lock, flags);
897
898 return fid;
899
900 error:
901 kfree(fid);
902 return ERR_PTR(ret);
903 }
904
905 static void p9_fid_destroy(struct p9_fid *fid)
906 {
907 struct p9_client *clnt;
908 unsigned long flags;
909
910 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
911 clnt = fid->clnt;
912 p9_idpool_put(fid->fid, clnt->fidpool);
913 spin_lock_irqsave(&clnt->lock, flags);
914 list_del(&fid->flist);
915 spin_unlock_irqrestore(&clnt->lock, flags);
916 kfree(fid->rdir);
917 kfree(fid);
918 }
919
920 static int p9_client_version(struct p9_client *c)
921 {
922 int err = 0;
923 struct p9_req_t *req;
924 char *version;
925 int msize;
926
927 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
928 c->msize, c->proto_version);
929
930 switch (c->proto_version) {
931 case p9_proto_2000L:
932 req = p9_client_rpc(c, P9_TVERSION, "ds",
933 c->msize, "9P2000.L");
934 break;
935 case p9_proto_2000u:
936 req = p9_client_rpc(c, P9_TVERSION, "ds",
937 c->msize, "9P2000.u");
938 break;
939 case p9_proto_legacy:
940 req = p9_client_rpc(c, P9_TVERSION, "ds",
941 c->msize, "9P2000");
942 break;
943 default:
944 return -EINVAL;
945 break;
946 }
947
948 if (IS_ERR(req))
949 return PTR_ERR(req);
950
951 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
952 if (err) {
953 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
954 trace_9p_protocol_dump(c, req->rc);
955 goto error;
956 }
957
958 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
959 if (!strncmp(version, "9P2000.L", 8))
960 c->proto_version = p9_proto_2000L;
961 else if (!strncmp(version, "9P2000.u", 8))
962 c->proto_version = p9_proto_2000u;
963 else if (!strncmp(version, "9P2000", 6))
964 c->proto_version = p9_proto_legacy;
965 else {
966 err = -EREMOTEIO;
967 goto error;
968 }
969
970 if (msize < c->msize)
971 c->msize = msize;
972
973 error:
974 kfree(version);
975 p9_free_req(c, req);
976
977 return err;
978 }
979
980 struct p9_client *p9_client_create(const char *dev_name, char *options)
981 {
982 int err;
983 struct p9_client *clnt;
984
985 err = 0;
986 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
987 if (!clnt)
988 return ERR_PTR(-ENOMEM);
989
990 clnt->trans_mod = NULL;
991 clnt->trans = NULL;
992 spin_lock_init(&clnt->lock);
993 INIT_LIST_HEAD(&clnt->fidlist);
994
995 err = p9_tag_init(clnt);
996 if (err < 0)
997 goto free_client;
998
999 err = parse_opts(options, clnt);
1000 if (err < 0)
1001 goto destroy_tagpool;
1002
1003 if (!clnt->trans_mod)
1004 clnt->trans_mod = v9fs_get_default_trans();
1005
1006 if (clnt->trans_mod == NULL) {
1007 err = -EPROTONOSUPPORT;
1008 p9_debug(P9_DEBUG_ERROR,
1009 "No transport defined or default transport\n");
1010 goto destroy_tagpool;
1011 }
1012
1013 clnt->fidpool = p9_idpool_create();
1014 if (IS_ERR(clnt->fidpool)) {
1015 err = PTR_ERR(clnt->fidpool);
1016 goto put_trans;
1017 }
1018
1019 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1020 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1021
1022 err = clnt->trans_mod->create(clnt, dev_name, options);
1023 if (err)
1024 goto destroy_fidpool;
1025
1026 if (clnt->msize > clnt->trans_mod->maxsize)
1027 clnt->msize = clnt->trans_mod->maxsize;
1028
1029 err = p9_client_version(clnt);
1030 if (err)
1031 goto close_trans;
1032
1033 return clnt;
1034
1035 close_trans:
1036 clnt->trans_mod->close(clnt);
1037 destroy_fidpool:
1038 p9_idpool_destroy(clnt->fidpool);
1039 put_trans:
1040 v9fs_put_trans(clnt->trans_mod);
1041 destroy_tagpool:
1042 p9_idpool_destroy(clnt->tagpool);
1043 free_client:
1044 kfree(clnt);
1045 return ERR_PTR(err);
1046 }
1047 EXPORT_SYMBOL(p9_client_create);
1048
1049 void p9_client_destroy(struct p9_client *clnt)
1050 {
1051 struct p9_fid *fid, *fidptr;
1052
1053 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1054
1055 if (clnt->trans_mod)
1056 clnt->trans_mod->close(clnt);
1057
1058 v9fs_put_trans(clnt->trans_mod);
1059
1060 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
1061 pr_info("Found fid %d not clunked\n", fid->fid);
1062 p9_fid_destroy(fid);
1063 }
1064
1065 if (clnt->fidpool)
1066 p9_idpool_destroy(clnt->fidpool);
1067
1068 p9_tag_cleanup(clnt);
1069
1070 kfree(clnt);
1071 }
1072 EXPORT_SYMBOL(p9_client_destroy);
1073
1074 void p9_client_disconnect(struct p9_client *clnt)
1075 {
1076 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1077 clnt->status = Disconnected;
1078 }
1079 EXPORT_SYMBOL(p9_client_disconnect);
1080
1081 void p9_client_begin_disconnect(struct p9_client *clnt)
1082 {
1083 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1084 clnt->status = BeginDisconnect;
1085 }
1086 EXPORT_SYMBOL(p9_client_begin_disconnect);
1087
1088 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1089 char *uname, u32 n_uname, char *aname)
1090 {
1091 int err = 0;
1092 struct p9_req_t *req;
1093 struct p9_fid *fid;
1094 struct p9_qid qid;
1095
1096
1097 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1098 afid ? afid->fid : -1, uname, aname);
1099 fid = p9_fid_create(clnt);
1100 if (IS_ERR(fid)) {
1101 err = PTR_ERR(fid);
1102 fid = NULL;
1103 goto error;
1104 }
1105
1106 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
1107 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1108 if (IS_ERR(req)) {
1109 err = PTR_ERR(req);
1110 goto error;
1111 }
1112
1113 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
1114 if (err) {
1115 trace_9p_protocol_dump(clnt, req->rc);
1116 p9_free_req(clnt, req);
1117 goto error;
1118 }
1119
1120 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1121 qid.type, (unsigned long long)qid.path, qid.version);
1122
1123 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1124
1125 p9_free_req(clnt, req);
1126 return fid;
1127
1128 error:
1129 if (fid)
1130 p9_fid_destroy(fid);
1131 return ERR_PTR(err);
1132 }
1133 EXPORT_SYMBOL(p9_client_attach);
1134
1135 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1136 char **wnames, int clone)
1137 {
1138 int err;
1139 struct p9_client *clnt;
1140 struct p9_fid *fid;
1141 struct p9_qid *wqids;
1142 struct p9_req_t *req;
1143 uint16_t nwqids, count;
1144
1145 err = 0;
1146 wqids = NULL;
1147 clnt = oldfid->clnt;
1148 if (clone) {
1149 fid = p9_fid_create(clnt);
1150 if (IS_ERR(fid)) {
1151 err = PTR_ERR(fid);
1152 fid = NULL;
1153 goto error;
1154 }
1155
1156 fid->uid = oldfid->uid;
1157 } else
1158 fid = oldfid;
1159
1160
1161 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1162 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1163
1164 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1165 nwname, wnames);
1166 if (IS_ERR(req)) {
1167 err = PTR_ERR(req);
1168 goto error;
1169 }
1170
1171 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1172 if (err) {
1173 trace_9p_protocol_dump(clnt, req->rc);
1174 p9_free_req(clnt, req);
1175 goto clunk_fid;
1176 }
1177 p9_free_req(clnt, req);
1178
1179 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1180
1181 if (nwqids != nwname) {
1182 err = -ENOENT;
1183 goto clunk_fid;
1184 }
1185
1186 for (count = 0; count < nwqids; count++)
1187 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1188 count, wqids[count].type,
1189 (unsigned long long)wqids[count].path,
1190 wqids[count].version);
1191
1192 if (nwname)
1193 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1194 else
1195 fid->qid = oldfid->qid;
1196
1197 kfree(wqids);
1198 return fid;
1199
1200 clunk_fid:
1201 kfree(wqids);
1202 p9_client_clunk(fid);
1203 fid = NULL;
1204
1205 error:
1206 if (fid && (fid != oldfid))
1207 p9_fid_destroy(fid);
1208
1209 return ERR_PTR(err);
1210 }
1211 EXPORT_SYMBOL(p9_client_walk);
1212
1213 int p9_client_open(struct p9_fid *fid, int mode)
1214 {
1215 int err;
1216 struct p9_client *clnt;
1217 struct p9_req_t *req;
1218 struct p9_qid qid;
1219 int iounit;
1220
1221 clnt = fid->clnt;
1222 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1223 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1224 err = 0;
1225
1226 if (fid->mode != -1)
1227 return -EINVAL;
1228
1229 if (p9_is_proto_dotl(clnt))
1230 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1231 else
1232 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1233 if (IS_ERR(req)) {
1234 err = PTR_ERR(req);
1235 goto error;
1236 }
1237
1238 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1239 if (err) {
1240 trace_9p_protocol_dump(clnt, req->rc);
1241 goto free_and_error;
1242 }
1243
1244 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1245 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1246 (unsigned long long)qid.path, qid.version, iounit);
1247
1248 fid->mode = mode;
1249 fid->iounit = iounit;
1250
1251 free_and_error:
1252 p9_free_req(clnt, req);
1253 error:
1254 return err;
1255 }
1256 EXPORT_SYMBOL(p9_client_open);
1257
1258 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1259 gid_t gid, struct p9_qid *qid)
1260 {
1261 int err = 0;
1262 struct p9_client *clnt;
1263 struct p9_req_t *req;
1264 int iounit;
1265
1266 p9_debug(P9_DEBUG_9P,
1267 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1268 ofid->fid, name, flags, mode, gid);
1269 clnt = ofid->clnt;
1270
1271 if (ofid->mode != -1)
1272 return -EINVAL;
1273
1274 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags,
1275 mode, gid);
1276 if (IS_ERR(req)) {
1277 err = PTR_ERR(req);
1278 goto error;
1279 }
1280
1281 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1282 if (err) {
1283 trace_9p_protocol_dump(clnt, req->rc);
1284 goto free_and_error;
1285 }
1286
1287 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1288 qid->type,
1289 (unsigned long long)qid->path,
1290 qid->version, iounit);
1291
1292 ofid->mode = mode;
1293 ofid->iounit = iounit;
1294
1295 free_and_error:
1296 p9_free_req(clnt, req);
1297 error:
1298 return err;
1299 }
1300 EXPORT_SYMBOL(p9_client_create_dotl);
1301
1302 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1303 char *extension)
1304 {
1305 int err;
1306 struct p9_client *clnt;
1307 struct p9_req_t *req;
1308 struct p9_qid qid;
1309 int iounit;
1310
1311 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1312 fid->fid, name, perm, mode);
1313 err = 0;
1314 clnt = fid->clnt;
1315
1316 if (fid->mode != -1)
1317 return -EINVAL;
1318
1319 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1320 mode, extension);
1321 if (IS_ERR(req)) {
1322 err = PTR_ERR(req);
1323 goto error;
1324 }
1325
1326 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1327 if (err) {
1328 trace_9p_protocol_dump(clnt, req->rc);
1329 goto free_and_error;
1330 }
1331
1332 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1333 qid.type,
1334 (unsigned long long)qid.path,
1335 qid.version, iounit);
1336
1337 fid->mode = mode;
1338 fid->iounit = iounit;
1339
1340 free_and_error:
1341 p9_free_req(clnt, req);
1342 error:
1343 return err;
1344 }
1345 EXPORT_SYMBOL(p9_client_fcreate);
1346
1347 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid,
1348 struct p9_qid *qid)
1349 {
1350 int err = 0;
1351 struct p9_client *clnt;
1352 struct p9_req_t *req;
1353
1354 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1355 dfid->fid, name, symtgt);
1356 clnt = dfid->clnt;
1357
1358 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt,
1359 gid);
1360 if (IS_ERR(req)) {
1361 err = PTR_ERR(req);
1362 goto error;
1363 }
1364
1365 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1366 if (err) {
1367 trace_9p_protocol_dump(clnt, req->rc);
1368 goto free_and_error;
1369 }
1370
1371 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1372 qid->type, (unsigned long long)qid->path, qid->version);
1373
1374 free_and_error:
1375 p9_free_req(clnt, req);
1376 error:
1377 return err;
1378 }
1379 EXPORT_SYMBOL(p9_client_symlink);
1380
1381 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1382 {
1383 struct p9_client *clnt;
1384 struct p9_req_t *req;
1385
1386 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1387 dfid->fid, oldfid->fid, newname);
1388 clnt = dfid->clnt;
1389 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1390 newname);
1391 if (IS_ERR(req))
1392 return PTR_ERR(req);
1393
1394 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1395 p9_free_req(clnt, req);
1396 return 0;
1397 }
1398 EXPORT_SYMBOL(p9_client_link);
1399
1400 int p9_client_fsync(struct p9_fid *fid, int datasync)
1401 {
1402 int err;
1403 struct p9_client *clnt;
1404 struct p9_req_t *req;
1405
1406 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1407 fid->fid, datasync);
1408 err = 0;
1409 clnt = fid->clnt;
1410
1411 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1412 if (IS_ERR(req)) {
1413 err = PTR_ERR(req);
1414 goto error;
1415 }
1416
1417 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1418
1419 p9_free_req(clnt, req);
1420
1421 error:
1422 return err;
1423 }
1424 EXPORT_SYMBOL(p9_client_fsync);
1425
1426 int p9_client_clunk(struct p9_fid *fid)
1427 {
1428 int err;
1429 struct p9_client *clnt;
1430 struct p9_req_t *req;
1431 int retries = 0;
1432
1433 if (!fid) {
1434 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1435 __func__, task_pid_nr(current));
1436 dump_stack();
1437 return 0;
1438 }
1439
1440 again:
1441 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1442 retries);
1443 err = 0;
1444 clnt = fid->clnt;
1445
1446 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1447 if (IS_ERR(req)) {
1448 err = PTR_ERR(req);
1449 goto error;
1450 }
1451
1452 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1453
1454 p9_free_req(clnt, req);
1455 error:
1456 /*
1457 * Fid is not valid even after a failed clunk
1458 * If interrupted, retry once then give up and
1459 * leak fid until umount.
1460 */
1461 if (err == -ERESTARTSYS) {
1462 if (retries++ == 0)
1463 goto again;
1464 } else
1465 p9_fid_destroy(fid);
1466 return err;
1467 }
1468 EXPORT_SYMBOL(p9_client_clunk);
1469
1470 int p9_client_remove(struct p9_fid *fid)
1471 {
1472 int err;
1473 struct p9_client *clnt;
1474 struct p9_req_t *req;
1475
1476 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1477 err = 0;
1478 clnt = fid->clnt;
1479
1480 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1481 if (IS_ERR(req)) {
1482 err = PTR_ERR(req);
1483 goto error;
1484 }
1485
1486 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1487
1488 p9_free_req(clnt, req);
1489 error:
1490 if (err == -ERESTARTSYS)
1491 p9_client_clunk(fid);
1492 else
1493 p9_fid_destroy(fid);
1494 return err;
1495 }
1496 EXPORT_SYMBOL(p9_client_remove);
1497
1498 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1499 {
1500 int err = 0;
1501 struct p9_req_t *req;
1502 struct p9_client *clnt;
1503
1504 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1505 dfid->fid, name, flags);
1506
1507 clnt = dfid->clnt;
1508 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1509 if (IS_ERR(req)) {
1510 err = PTR_ERR(req);
1511 goto error;
1512 }
1513 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1514
1515 p9_free_req(clnt, req);
1516 error:
1517 return err;
1518 }
1519 EXPORT_SYMBOL(p9_client_unlinkat);
1520
1521 int
1522 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1523 u32 count)
1524 {
1525 char *dataptr;
1526 int kernel_buf = 0;
1527 struct p9_req_t *req;
1528 struct p9_client *clnt;
1529 int err, rsize, non_zc = 0;
1530
1531
1532 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1533 fid->fid, (unsigned long long) offset, count);
1534 err = 0;
1535 clnt = fid->clnt;
1536
1537 rsize = fid->iounit;
1538 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1539 rsize = clnt->msize - P9_IOHDRSZ;
1540
1541 if (count < rsize)
1542 rsize = count;
1543
1544 /* Don't bother zerocopy for small IO (< 1024) */
1545 if (clnt->trans_mod->zc_request && rsize > 1024) {
1546 char *indata;
1547 if (data) {
1548 kernel_buf = 1;
1549 indata = data;
1550 } else
1551 indata = (__force char *)udata;
1552 /*
1553 * response header len is 11
1554 * PDU Header(7) + IO Size (4)
1555 */
1556 req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0,
1557 11, kernel_buf, "dqd", fid->fid,
1558 offset, rsize);
1559 } else {
1560 non_zc = 1;
1561 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1562 rsize);
1563 }
1564 if (IS_ERR(req)) {
1565 err = PTR_ERR(req);
1566 goto error;
1567 }
1568
1569 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1570 if (err) {
1571 trace_9p_protocol_dump(clnt, req->rc);
1572 goto free_and_error;
1573 }
1574
1575 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1576
1577 if (non_zc) {
1578 if (data) {
1579 memmove(data, dataptr, count);
1580 } else {
1581 err = copy_to_user(udata, dataptr, count);
1582 if (err) {
1583 err = -EFAULT;
1584 goto free_and_error;
1585 }
1586 }
1587 }
1588 p9_free_req(clnt, req);
1589 return count;
1590
1591 free_and_error:
1592 p9_free_req(clnt, req);
1593 error:
1594 return err;
1595 }
1596 EXPORT_SYMBOL(p9_client_read);
1597
1598 int
1599 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1600 u64 offset, u32 count)
1601 {
1602 int err, rsize;
1603 int kernel_buf = 0;
1604 struct p9_client *clnt;
1605 struct p9_req_t *req;
1606
1607 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1608 fid->fid, (unsigned long long) offset, count);
1609 err = 0;
1610 clnt = fid->clnt;
1611
1612 rsize = fid->iounit;
1613 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1614 rsize = clnt->msize - P9_IOHDRSZ;
1615
1616 if (count < rsize)
1617 rsize = count;
1618
1619 /* Don't bother zerocopy for small IO (< 1024) */
1620 if (clnt->trans_mod->zc_request && rsize > 1024) {
1621 char *odata;
1622 if (data) {
1623 kernel_buf = 1;
1624 odata = data;
1625 } else
1626 odata = (char *)udata;
1627 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize,
1628 P9_ZC_HDR_SZ, kernel_buf, "dqd",
1629 fid->fid, offset, rsize);
1630 } else {
1631 if (data)
1632 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
1633 offset, rsize, data);
1634 else
1635 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
1636 offset, rsize, udata);
1637 }
1638 if (IS_ERR(req)) {
1639 err = PTR_ERR(req);
1640 goto error;
1641 }
1642
1643 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1644 if (err) {
1645 trace_9p_protocol_dump(clnt, req->rc);
1646 goto free_and_error;
1647 }
1648
1649 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1650
1651 p9_free_req(clnt, req);
1652 return count;
1653
1654 free_and_error:
1655 p9_free_req(clnt, req);
1656 error:
1657 return err;
1658 }
1659 EXPORT_SYMBOL(p9_client_write);
1660
1661 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1662 {
1663 int err;
1664 struct p9_client *clnt;
1665 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1666 struct p9_req_t *req;
1667 u16 ignored;
1668
1669 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1670
1671 if (!ret)
1672 return ERR_PTR(-ENOMEM);
1673
1674 err = 0;
1675 clnt = fid->clnt;
1676
1677 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1678 if (IS_ERR(req)) {
1679 err = PTR_ERR(req);
1680 goto error;
1681 }
1682
1683 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1684 if (err) {
1685 trace_9p_protocol_dump(clnt, req->rc);
1686 p9_free_req(clnt, req);
1687 goto error;
1688 }
1689
1690 p9_debug(P9_DEBUG_9P,
1691 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1692 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1693 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1694 "<<< uid=%d gid=%d n_muid=%d\n",
1695 ret->size, ret->type, ret->dev, ret->qid.type,
1696 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1697 ret->atime, ret->mtime, (unsigned long long)ret->length,
1698 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1699 ret->n_uid, ret->n_gid, ret->n_muid);
1700
1701 p9_free_req(clnt, req);
1702 return ret;
1703
1704 error:
1705 kfree(ret);
1706 return ERR_PTR(err);
1707 }
1708 EXPORT_SYMBOL(p9_client_stat);
1709
1710 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1711 u64 request_mask)
1712 {
1713 int err;
1714 struct p9_client *clnt;
1715 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1716 GFP_KERNEL);
1717 struct p9_req_t *req;
1718
1719 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1720 fid->fid, request_mask);
1721
1722 if (!ret)
1723 return ERR_PTR(-ENOMEM);
1724
1725 err = 0;
1726 clnt = fid->clnt;
1727
1728 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1729 if (IS_ERR(req)) {
1730 err = PTR_ERR(req);
1731 goto error;
1732 }
1733
1734 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1735 if (err) {
1736 trace_9p_protocol_dump(clnt, req->rc);
1737 p9_free_req(clnt, req);
1738 goto error;
1739 }
1740
1741 p9_debug(P9_DEBUG_9P,
1742 "<<< RGETATTR st_result_mask=%lld\n"
1743 "<<< qid=%x.%llx.%x\n"
1744 "<<< st_mode=%8.8x st_nlink=%llu\n"
1745 "<<< st_uid=%d st_gid=%d\n"
1746 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1747 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1748 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1749 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1750 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1751 "<<< st_gen=%lld st_data_version=%lld",
1752 ret->st_result_mask, ret->qid.type, ret->qid.path,
1753 ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid,
1754 ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize,
1755 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1756 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1757 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1758 ret->st_gen, ret->st_data_version);
1759
1760 p9_free_req(clnt, req);
1761 return ret;
1762
1763 error:
1764 kfree(ret);
1765 return ERR_PTR(err);
1766 }
1767 EXPORT_SYMBOL(p9_client_getattr_dotl);
1768
1769 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1770 {
1771 int ret;
1772
1773 /* NOTE: size shouldn't include its own length */
1774 /* size[2] type[2] dev[4] qid[13] */
1775 /* mode[4] atime[4] mtime[4] length[8]*/
1776 /* name[s] uid[s] gid[s] muid[s] */
1777 ret = 2+4+13+4+4+4+8+2+2+2+2;
1778
1779 if (wst->name)
1780 ret += strlen(wst->name);
1781 if (wst->uid)
1782 ret += strlen(wst->uid);
1783 if (wst->gid)
1784 ret += strlen(wst->gid);
1785 if (wst->muid)
1786 ret += strlen(wst->muid);
1787
1788 if ((proto_version == p9_proto_2000u) ||
1789 (proto_version == p9_proto_2000L)) {
1790 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1791 if (wst->extension)
1792 ret += strlen(wst->extension);
1793 }
1794
1795 return ret;
1796 }
1797
1798 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1799 {
1800 int err;
1801 struct p9_req_t *req;
1802 struct p9_client *clnt;
1803
1804 err = 0;
1805 clnt = fid->clnt;
1806 wst->size = p9_client_statsize(wst, clnt->proto_version);
1807 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1808 p9_debug(P9_DEBUG_9P,
1809 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1810 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1811 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1812 " uid=%d gid=%d n_muid=%d\n",
1813 wst->size, wst->type, wst->dev, wst->qid.type,
1814 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1815 wst->atime, wst->mtime, (unsigned long long)wst->length,
1816 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1817 wst->n_uid, wst->n_gid, wst->n_muid);
1818
1819 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1820 if (IS_ERR(req)) {
1821 err = PTR_ERR(req);
1822 goto error;
1823 }
1824
1825 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1826
1827 p9_free_req(clnt, req);
1828 error:
1829 return err;
1830 }
1831 EXPORT_SYMBOL(p9_client_wstat);
1832
1833 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1834 {
1835 int err;
1836 struct p9_req_t *req;
1837 struct p9_client *clnt;
1838
1839 err = 0;
1840 clnt = fid->clnt;
1841 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1842 p9_debug(P9_DEBUG_9P,
1843 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1844 " atime_sec=%lld atime_nsec=%lld\n"
1845 " mtime_sec=%lld mtime_nsec=%lld\n",
1846 p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid,
1847 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1848 p9attr->mtime_sec, p9attr->mtime_nsec);
1849
1850 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1851
1852 if (IS_ERR(req)) {
1853 err = PTR_ERR(req);
1854 goto error;
1855 }
1856 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1857 p9_free_req(clnt, req);
1858 error:
1859 return err;
1860 }
1861 EXPORT_SYMBOL(p9_client_setattr);
1862
1863 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1864 {
1865 int err;
1866 struct p9_req_t *req;
1867 struct p9_client *clnt;
1868
1869 err = 0;
1870 clnt = fid->clnt;
1871
1872 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1873
1874 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1875 if (IS_ERR(req)) {
1876 err = PTR_ERR(req);
1877 goto error;
1878 }
1879
1880 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1881 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1882 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1883 if (err) {
1884 trace_9p_protocol_dump(clnt, req->rc);
1885 p9_free_req(clnt, req);
1886 goto error;
1887 }
1888
1889 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1890 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1891 "fsid %llu namelen %ld\n",
1892 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1893 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1894 sb->fsid, (long int)sb->namelen);
1895
1896 p9_free_req(clnt, req);
1897 error:
1898 return err;
1899 }
1900 EXPORT_SYMBOL(p9_client_statfs);
1901
1902 int p9_client_rename(struct p9_fid *fid,
1903 struct p9_fid *newdirfid, const char *name)
1904 {
1905 int err;
1906 struct p9_req_t *req;
1907 struct p9_client *clnt;
1908
1909 err = 0;
1910 clnt = fid->clnt;
1911
1912 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1913 fid->fid, newdirfid->fid, name);
1914
1915 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1916 newdirfid->fid, name);
1917 if (IS_ERR(req)) {
1918 err = PTR_ERR(req);
1919 goto error;
1920 }
1921
1922 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1923
1924 p9_free_req(clnt, req);
1925 error:
1926 return err;
1927 }
1928 EXPORT_SYMBOL(p9_client_rename);
1929
1930 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1931 struct p9_fid *newdirfid, const char *new_name)
1932 {
1933 int err;
1934 struct p9_req_t *req;
1935 struct p9_client *clnt;
1936
1937 err = 0;
1938 clnt = olddirfid->clnt;
1939
1940 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1941 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1942 newdirfid->fid, new_name);
1943
1944 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1945 old_name, newdirfid->fid, new_name);
1946 if (IS_ERR(req)) {
1947 err = PTR_ERR(req);
1948 goto error;
1949 }
1950
1951 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1952 newdirfid->fid, new_name);
1953
1954 p9_free_req(clnt, req);
1955 error:
1956 return err;
1957 }
1958 EXPORT_SYMBOL(p9_client_renameat);
1959
1960 /*
1961 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1962 */
1963 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1964 const char *attr_name, u64 *attr_size)
1965 {
1966 int err;
1967 struct p9_req_t *req;
1968 struct p9_client *clnt;
1969 struct p9_fid *attr_fid;
1970
1971 err = 0;
1972 clnt = file_fid->clnt;
1973 attr_fid = p9_fid_create(clnt);
1974 if (IS_ERR(attr_fid)) {
1975 err = PTR_ERR(attr_fid);
1976 attr_fid = NULL;
1977 goto error;
1978 }
1979 p9_debug(P9_DEBUG_9P,
1980 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
1981 file_fid->fid, attr_fid->fid, attr_name);
1982
1983 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
1984 file_fid->fid, attr_fid->fid, attr_name);
1985 if (IS_ERR(req)) {
1986 err = PTR_ERR(req);
1987 goto error;
1988 }
1989 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
1990 if (err) {
1991 trace_9p_protocol_dump(clnt, req->rc);
1992 p9_free_req(clnt, req);
1993 goto clunk_fid;
1994 }
1995 p9_free_req(clnt, req);
1996 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
1997 attr_fid->fid, *attr_size);
1998 return attr_fid;
1999 clunk_fid:
2000 p9_client_clunk(attr_fid);
2001 attr_fid = NULL;
2002 error:
2003 if (attr_fid && (attr_fid != file_fid))
2004 p9_fid_destroy(attr_fid);
2005
2006 return ERR_PTR(err);
2007 }
2008 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2009
2010 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2011 u64 attr_size, int flags)
2012 {
2013 int err;
2014 struct p9_req_t *req;
2015 struct p9_client *clnt;
2016
2017 p9_debug(P9_DEBUG_9P,
2018 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2019 fid->fid, name, (long long)attr_size, flags);
2020 err = 0;
2021 clnt = fid->clnt;
2022 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2023 fid->fid, name, attr_size, flags);
2024 if (IS_ERR(req)) {
2025 err = PTR_ERR(req);
2026 goto error;
2027 }
2028 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2029 p9_free_req(clnt, req);
2030 error:
2031 return err;
2032 }
2033 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2034
2035 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2036 {
2037 int err, rsize, non_zc = 0;
2038 struct p9_client *clnt;
2039 struct p9_req_t *req;
2040 char *dataptr;
2041
2042 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2043 fid->fid, (unsigned long long) offset, count);
2044
2045 err = 0;
2046 clnt = fid->clnt;
2047
2048 rsize = fid->iounit;
2049 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2050 rsize = clnt->msize - P9_READDIRHDRSZ;
2051
2052 if (count < rsize)
2053 rsize = count;
2054
2055 /* Don't bother zerocopy for small IO (< 1024) */
2056 if (clnt->trans_mod->zc_request && rsize > 1024) {
2057 /*
2058 * response header len is 11
2059 * PDU Header(7) + IO Size (4)
2060 */
2061 req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0,
2062 11, 1, "dqd", fid->fid, offset, rsize);
2063 } else {
2064 non_zc = 1;
2065 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2066 offset, rsize);
2067 }
2068 if (IS_ERR(req)) {
2069 err = PTR_ERR(req);
2070 goto error;
2071 }
2072
2073 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2074 if (err) {
2075 trace_9p_protocol_dump(clnt, req->rc);
2076 goto free_and_error;
2077 }
2078
2079 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2080
2081 if (non_zc)
2082 memmove(data, dataptr, count);
2083
2084 p9_free_req(clnt, req);
2085 return count;
2086
2087 free_and_error:
2088 p9_free_req(clnt, req);
2089 error:
2090 return err;
2091 }
2092 EXPORT_SYMBOL(p9_client_readdir);
2093
2094 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
2095 dev_t rdev, gid_t gid, struct p9_qid *qid)
2096 {
2097 int err;
2098 struct p9_client *clnt;
2099 struct p9_req_t *req;
2100
2101 err = 0;
2102 clnt = fid->clnt;
2103 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2104 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2105 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode,
2106 MAJOR(rdev), MINOR(rdev), gid);
2107 if (IS_ERR(req))
2108 return PTR_ERR(req);
2109
2110 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2111 if (err) {
2112 trace_9p_protocol_dump(clnt, req->rc);
2113 goto error;
2114 }
2115 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2116 (unsigned long long)qid->path, qid->version);
2117
2118 error:
2119 p9_free_req(clnt, req);
2120 return err;
2121
2122 }
2123 EXPORT_SYMBOL(p9_client_mknod_dotl);
2124
2125 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
2126 gid_t gid, struct p9_qid *qid)
2127 {
2128 int err;
2129 struct p9_client *clnt;
2130 struct p9_req_t *req;
2131
2132 err = 0;
2133 clnt = fid->clnt;
2134 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2135 fid->fid, name, mode, gid);
2136 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode,
2137 gid);
2138 if (IS_ERR(req))
2139 return PTR_ERR(req);
2140
2141 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2142 if (err) {
2143 trace_9p_protocol_dump(clnt, req->rc);
2144 goto error;
2145 }
2146 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2147 (unsigned long long)qid->path, qid->version);
2148
2149 error:
2150 p9_free_req(clnt, req);
2151 return err;
2152
2153 }
2154 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2155
2156 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2157 {
2158 int err;
2159 struct p9_client *clnt;
2160 struct p9_req_t *req;
2161
2162 err = 0;
2163 clnt = fid->clnt;
2164 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2165 "start %lld length %lld proc_id %d client_id %s\n",
2166 fid->fid, flock->type, flock->flags, flock->start,
2167 flock->length, flock->proc_id, flock->client_id);
2168
2169 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2170 flock->flags, flock->start, flock->length,
2171 flock->proc_id, flock->client_id);
2172
2173 if (IS_ERR(req))
2174 return PTR_ERR(req);
2175
2176 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2177 if (err) {
2178 trace_9p_protocol_dump(clnt, req->rc);
2179 goto error;
2180 }
2181 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2182 error:
2183 p9_free_req(clnt, req);
2184 return err;
2185
2186 }
2187 EXPORT_SYMBOL(p9_client_lock_dotl);
2188
2189 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2190 {
2191 int err;
2192 struct p9_client *clnt;
2193 struct p9_req_t *req;
2194
2195 err = 0;
2196 clnt = fid->clnt;
2197 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2198 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2199 glock->start, glock->length, glock->proc_id, glock->client_id);
2200
2201 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2202 glock->start, glock->length, glock->proc_id, glock->client_id);
2203
2204 if (IS_ERR(req))
2205 return PTR_ERR(req);
2206
2207 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2208 &glock->start, &glock->length, &glock->proc_id,
2209 &glock->client_id);
2210 if (err) {
2211 trace_9p_protocol_dump(clnt, req->rc);
2212 goto error;
2213 }
2214 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2215 "proc_id %d client_id %s\n", glock->type, glock->start,
2216 glock->length, glock->proc_id, glock->client_id);
2217 error:
2218 p9_free_req(clnt, req);
2219 return err;
2220 }
2221 EXPORT_SYMBOL(p9_client_getlock_dotl);
2222
2223 int p9_client_readlink(struct p9_fid *fid, char **target)
2224 {
2225 int err;
2226 struct p9_client *clnt;
2227 struct p9_req_t *req;
2228
2229 err = 0;
2230 clnt = fid->clnt;
2231 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2232
2233 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2234 if (IS_ERR(req))
2235 return PTR_ERR(req);
2236
2237 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2238 if (err) {
2239 trace_9p_protocol_dump(clnt, req->rc);
2240 goto error;
2241 }
2242 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2243 error:
2244 p9_free_req(clnt, req);
2245 return err;
2246 }
2247 EXPORT_SYMBOL(p9_client_readlink);
(deprecated) Btrfs devel tree