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Merge tag 'locks-v3.16-2' of git://git.samba.org/jlayton/linux
[linux/fpc-iii.git] / net / 9p / client.c
blob0004cbaac4a41d9737e017e257c9083df4969b8a
1 /*
2 * net/9p/clnt.c
3 *
4 * 9P Client
5 *
6 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to:
20 * Free Software Foundation
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02111-1301 USA
23 *
24 */
25
26 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
27
28 #include <linux/module.h>
29 #include <linux/errno.h>
30 #include <linux/fs.h>
31 #include <linux/poll.h>
32 #include <linux/idr.h>
33 #include <linux/mutex.h>
34 #include <linux/slab.h>
35 #include <linux/sched.h>
36 #include <linux/uaccess.h>
37 #include <net/9p/9p.h>
38 #include <linux/parser.h>
39 #include <net/9p/client.h>
40 #include <net/9p/transport.h>
41 #include "protocol.h"
42
43 #define CREATE_TRACE_POINTS
44 #include <trace/events/9p.h>
45
46 /*
47 * Client Option Parsing (code inspired by NFS code)
48 * - a little lazy - parse all client options
49 */
50
51 enum {
52 Opt_msize,
53 Opt_trans,
54 Opt_legacy,
55 Opt_version,
56 Opt_err,
57 };
58
59 static const match_table_t tokens = {
60 {Opt_msize, "msize=%u"},
61 {Opt_legacy, "noextend"},
62 {Opt_trans, "trans=%s"},
63 {Opt_version, "version=%s"},
64 {Opt_err, NULL},
65 };
66
67 inline int p9_is_proto_dotl(struct p9_client *clnt)
68 {
69 return clnt->proto_version == p9_proto_2000L;
70 }
71 EXPORT_SYMBOL(p9_is_proto_dotl);
72
73 inline int p9_is_proto_dotu(struct p9_client *clnt)
74 {
75 return clnt->proto_version == p9_proto_2000u;
76 }
77 EXPORT_SYMBOL(p9_is_proto_dotu);
78
79 /*
80 * Some error codes are taken directly from the server replies,
81 * make sure they are valid.
82 */
83 static int safe_errno(int err)
84 {
85 if ((err > 0) || (err < -MAX_ERRNO)) {
86 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err);
87 return -EPROTO;
88 }
89 return err;
90 }
91
92
93 /* Interpret mount option for protocol version */
94 static int get_protocol_version(char *s)
95 {
96 int version = -EINVAL;
97
98 if (!strcmp(s, "9p2000")) {
99 version = p9_proto_legacy;
100 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n");
101 } else if (!strcmp(s, "9p2000.u")) {
102 version = p9_proto_2000u;
103 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
104 } else if (!strcmp(s, "9p2000.L")) {
105 version = p9_proto_2000L;
106 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
107 } else
108 pr_info("Unknown protocol version %s\n", s);
109
110 return version;
111 }
112
113 /**
114 * parse_options - parse mount options into client structure
115 * @opts: options string passed from mount
116 * @clnt: existing v9fs client information
117 *
118 * Return 0 upon success, -ERRNO upon failure
119 */
120
121 static int parse_opts(char *opts, struct p9_client *clnt)
122 {
123 char *options, *tmp_options;
124 char *p;
125 substring_t args[MAX_OPT_ARGS];
126 int option;
127 char *s;
128 int ret = 0;
129
130 clnt->proto_version = p9_proto_2000L;
131 clnt->msize = 8192;
132
133 if (!opts)
134 return 0;
135
136 tmp_options = kstrdup(opts, GFP_KERNEL);
137 if (!tmp_options) {
138 p9_debug(P9_DEBUG_ERROR,
139 "failed to allocate copy of option string\n");
140 return -ENOMEM;
141 }
142 options = tmp_options;
143
144 while ((p = strsep(&options, ",")) != NULL) {
145 int token, r;
146 if (!*p)
147 continue;
148 token = match_token(p, tokens, args);
149 switch (token) {
150 case Opt_msize:
151 r = match_int(&args[0], &option);
152 if (r < 0) {
153 p9_debug(P9_DEBUG_ERROR,
154 "integer field, but no integer?\n");
155 ret = r;
156 continue;
157 }
158 clnt->msize = option;
159 break;
160 case Opt_trans:
161 s = match_strdup(&args[0]);
162 if (!s) {
163 ret = -ENOMEM;
164 p9_debug(P9_DEBUG_ERROR,
165 "problem allocating copy of trans arg\n");
166 goto free_and_return;
167 }
168 clnt->trans_mod = v9fs_get_trans_by_name(s);
169 if (clnt->trans_mod == NULL) {
170 pr_info("Could not find request transport: %s\n",
171 s);
172 ret = -EINVAL;
173 kfree(s);
174 goto free_and_return;
175 }
176 kfree(s);
177 break;
178 case Opt_legacy:
179 clnt->proto_version = p9_proto_legacy;
180 break;
181 case Opt_version:
182 s = match_strdup(&args[0]);
183 if (!s) {
184 ret = -ENOMEM;
185 p9_debug(P9_DEBUG_ERROR,
186 "problem allocating copy of version arg\n");
187 goto free_and_return;
188 }
189 ret = get_protocol_version(s);
190 if (ret == -EINVAL) {
191 kfree(s);
192 goto free_and_return;
193 }
194 kfree(s);
195 clnt->proto_version = ret;
196 break;
197 default:
198 continue;
199 }
200 }
201
202 free_and_return:
203 kfree(tmp_options);
204 return ret;
205 }
206
207 static struct p9_fcall *p9_fcall_alloc(int alloc_msize)
208 {
209 struct p9_fcall *fc;
210 fc = kmalloc(sizeof(struct p9_fcall) + alloc_msize, GFP_NOFS);
211 if (!fc)
212 return NULL;
213 fc->capacity = alloc_msize;
214 fc->sdata = (char *) fc + sizeof(struct p9_fcall);
215 return fc;
216 }
217
218 /**
219 * p9_tag_alloc - lookup/allocate a request by tag
220 * @c: client session to lookup tag within
221 * @tag: numeric id for transaction
222 *
223 * this is a simple array lookup, but will grow the
224 * request_slots as necessary to accommodate transaction
225 * ids which did not previously have a slot.
226 *
227 * this code relies on the client spinlock to manage locks, its
228 * possible we should switch to something else, but I'd rather
229 * stick with something low-overhead for the common case.
230 *
231 */
232
233 static struct p9_req_t *
234 p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
235 {
236 unsigned long flags;
237 int row, col;
238 struct p9_req_t *req;
239 int alloc_msize = min(c->msize, max_size);
240
241 /* This looks up the original request by tag so we know which
242 * buffer to read the data into */
243 tag++;
244
245 if (tag >= c->max_tag) {
246 spin_lock_irqsave(&c->lock, flags);
247 /* check again since original check was outside of lock */
248 while (tag >= c->max_tag) {
249 row = (tag / P9_ROW_MAXTAG);
250 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
251 sizeof(struct p9_req_t), GFP_ATOMIC);
252
253 if (!c->reqs[row]) {
254 pr_err("Couldn't grow tag array\n");
255 spin_unlock_irqrestore(&c->lock, flags);
256 return ERR_PTR(-ENOMEM);
257 }
258 for (col = 0; col < P9_ROW_MAXTAG; col++) {
259 c->reqs[row][col].status = REQ_STATUS_IDLE;
260 c->reqs[row][col].tc = NULL;
261 }
262 c->max_tag += P9_ROW_MAXTAG;
263 }
264 spin_unlock_irqrestore(&c->lock, flags);
265 }
266 row = tag / P9_ROW_MAXTAG;
267 col = tag % P9_ROW_MAXTAG;
268
269 req = &c->reqs[row][col];
270 if (!req->wq) {
271 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
272 if (!req->wq)
273 goto grow_failed;
274 init_waitqueue_head(req->wq);
275 }
276
277 if (!req->tc)
278 req->tc = p9_fcall_alloc(alloc_msize);
279 if (!req->rc)
280 req->rc = p9_fcall_alloc(alloc_msize);
281 if (!req->tc || !req->rc)
282 goto grow_failed;
283
284 p9pdu_reset(req->tc);
285 p9pdu_reset(req->rc);
286
287 req->tc->tag = tag-1;
288 req->status = REQ_STATUS_ALLOC;
289
290 return req;
291
292 grow_failed:
293 pr_err("Couldn't grow tag array\n");
294 kfree(req->tc);
295 kfree(req->rc);
296 kfree(req->wq);
297 req->tc = req->rc = NULL;
298 req->wq = NULL;
299 return ERR_PTR(-ENOMEM);
300 }
301
302 /**
303 * p9_tag_lookup - lookup a request by tag
304 * @c: client session to lookup tag within
305 * @tag: numeric id for transaction
306 *
307 */
308
309 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
310 {
311 int row, col;
312
313 /* This looks up the original request by tag so we know which
314 * buffer to read the data into */
315 tag++;
316
317 if(tag >= c->max_tag)
318 return NULL;
319
320 row = tag / P9_ROW_MAXTAG;
321 col = tag % P9_ROW_MAXTAG;
322
323 return &c->reqs[row][col];
324 }
325 EXPORT_SYMBOL(p9_tag_lookup);
326
327 /**
328 * p9_tag_init - setup tags structure and contents
329 * @c: v9fs client struct
330 *
331 * This initializes the tags structure for each client instance.
332 *
333 */
334
335 static int p9_tag_init(struct p9_client *c)
336 {
337 int err = 0;
338
339 c->tagpool = p9_idpool_create();
340 if (IS_ERR(c->tagpool)) {
341 err = PTR_ERR(c->tagpool);
342 goto error;
343 }
344 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
345 if (err < 0) {
346 p9_idpool_destroy(c->tagpool);
347 goto error;
348 }
349 c->max_tag = 0;
350 error:
351 return err;
352 }
353
354 /**
355 * p9_tag_cleanup - cleans up tags structure and reclaims resources
356 * @c: v9fs client struct
357 *
358 * This frees resources associated with the tags structure
359 *
360 */
361 static void p9_tag_cleanup(struct p9_client *c)
362 {
363 int row, col;
364
365 /* check to insure all requests are idle */
366 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
367 for (col = 0; col < P9_ROW_MAXTAG; col++) {
368 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
369 p9_debug(P9_DEBUG_MUX,
370 "Attempting to cleanup non-free tag %d,%d\n",
371 row, col);
372 /* TODO: delay execution of cleanup */
373 return;
374 }
375 }
376 }
377
378 if (c->tagpool) {
379 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
380 p9_idpool_destroy(c->tagpool);
381 }
382
383 /* free requests associated with tags */
384 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
385 for (col = 0; col < P9_ROW_MAXTAG; col++) {
386 kfree(c->reqs[row][col].wq);
387 kfree(c->reqs[row][col].tc);
388 kfree(c->reqs[row][col].rc);
389 }
390 kfree(c->reqs[row]);
391 }
392 c->max_tag = 0;
393 }
394
395 /**
396 * p9_free_req - free a request and clean-up as necessary
397 * c: client state
398 * r: request to release
399 *
400 */
401
402 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
403 {
404 int tag = r->tc->tag;
405 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
406
407 r->status = REQ_STATUS_IDLE;
408 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
409 p9_idpool_put(tag, c->tagpool);
410 }
411
412 /**
413 * p9_client_cb - call back from transport to client
414 * c: client state
415 * req: request received
416 *
417 */
418 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status)
419 {
420 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
421
422 /*
423 * This barrier is needed to make sure any change made to req before
424 * the other thread wakes up will indeed be seen by the waiting side.
425 */
426 smp_wmb();
427 req->status = status;
428
429 wake_up(req->wq);
430 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
431 }
432 EXPORT_SYMBOL(p9_client_cb);
433
434 /**
435 * p9_parse_header - parse header arguments out of a packet
436 * @pdu: packet to parse
437 * @size: size of packet
438 * @type: type of request
439 * @tag: tag of packet
440 * @rewind: set if we need to rewind offset afterwards
441 */
442
443 int
444 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
445 int rewind)
446 {
447 int8_t r_type;
448 int16_t r_tag;
449 int32_t r_size;
450 int offset = pdu->offset;
451 int err;
452
453 pdu->offset = 0;
454 if (pdu->size == 0)
455 pdu->size = 7;
456
457 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
458 if (err)
459 goto rewind_and_exit;
460
461 pdu->size = r_size;
462 pdu->id = r_type;
463 pdu->tag = r_tag;
464
465 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
466 pdu->size, pdu->id, pdu->tag);
467
468 if (type)
469 *type = r_type;
470 if (tag)
471 *tag = r_tag;
472 if (size)
473 *size = r_size;
474
475
476 rewind_and_exit:
477 if (rewind)
478 pdu->offset = offset;
479 return err;
480 }
481 EXPORT_SYMBOL(p9_parse_header);
482
483 /**
484 * p9_check_errors - check 9p packet for error return and process it
485 * @c: current client instance
486 * @req: request to parse and check for error conditions
487 *
488 * returns error code if one is discovered, otherwise returns 0
489 *
490 * this will have to be more complicated if we have multiple
491 * error packet types
492 */
493
494 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
495 {
496 int8_t type;
497 int err;
498 int ecode;
499
500 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
501 /*
502 * dump the response from server
503 * This should be after check errors which poplulate pdu_fcall.
504 */
505 trace_9p_protocol_dump(c, req->rc);
506 if (err) {
507 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
508 return err;
509 }
510 if (type != P9_RERROR && type != P9_RLERROR)
511 return 0;
512
513 if (!p9_is_proto_dotl(c)) {
514 char *ename;
515 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
516 &ename, &ecode);
517 if (err)
518 goto out_err;
519
520 if (p9_is_proto_dotu(c))
521 err = -ecode;
522
523 if (!err || !IS_ERR_VALUE(err)) {
524 err = p9_errstr2errno(ename, strlen(ename));
525
526 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
527 -ecode, ename);
528 }
529 kfree(ename);
530 } else {
531 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
532 err = -ecode;
533
534 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
535 }
536
537 return err;
538
539 out_err:
540 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
541
542 return err;
543 }
544
545 /**
546 * p9_check_zc_errors - check 9p packet for error return and process it
547 * @c: current client instance
548 * @req: request to parse and check for error conditions
549 * @in_hdrlen: Size of response protocol buffer.
550 *
551 * returns error code if one is discovered, otherwise returns 0
552 *
553 * this will have to be more complicated if we have multiple
554 * error packet types
555 */
556
557 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
558 char *uidata, int in_hdrlen, int kern_buf)
559 {
560 int err;
561 int ecode;
562 int8_t type;
563 char *ename = NULL;
564
565 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
566 /*
567 * dump the response from server
568 * This should be after parse_header which poplulate pdu_fcall.
569 */
570 trace_9p_protocol_dump(c, req->rc);
571 if (err) {
572 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
573 return err;
574 }
575
576 if (type != P9_RERROR && type != P9_RLERROR)
577 return 0;
578
579 if (!p9_is_proto_dotl(c)) {
580 /* Error is reported in string format */
581 int len;
582 /* 7 = header size for RERROR; */
583 int inline_len = in_hdrlen - 7;
584
585 len = req->rc->size - req->rc->offset;
586 if (len > (P9_ZC_HDR_SZ - 7)) {
587 err = -EFAULT;
588 goto out_err;
589 }
590
591 ename = &req->rc->sdata[req->rc->offset];
592 if (len > inline_len) {
593 /* We have error in external buffer */
594 if (kern_buf) {
595 memcpy(ename + inline_len, uidata,
596 len - inline_len);
597 } else {
598 err = copy_from_user(ename + inline_len,
599 uidata, len - inline_len);
600 if (err) {
601 err = -EFAULT;
602 goto out_err;
603 }
604 }
605 }
606 ename = NULL;
607 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
608 &ename, &ecode);
609 if (err)
610 goto out_err;
611
612 if (p9_is_proto_dotu(c))
613 err = -ecode;
614
615 if (!err || !IS_ERR_VALUE(err)) {
616 err = p9_errstr2errno(ename, strlen(ename));
617
618 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
619 -ecode, ename);
620 }
621 kfree(ename);
622 } else {
623 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
624 err = -ecode;
625
626 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
627 }
628 return err;
629
630 out_err:
631 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
632 return err;
633 }
634
635 static struct p9_req_t *
636 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
637
638 /**
639 * p9_client_flush - flush (cancel) a request
640 * @c: client state
641 * @oldreq: request to cancel
642 *
643 * This sents a flush for a particular request and links
644 * the flush request to the original request. The current
645 * code only supports a single flush request although the protocol
646 * allows for multiple flush requests to be sent for a single request.
647 *
648 */
649
650 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
651 {
652 struct p9_req_t *req;
653 int16_t oldtag;
654 int err;
655
656 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
657 if (err)
658 return err;
659
660 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
661
662 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
663 if (IS_ERR(req))
664 return PTR_ERR(req);
665
666 /*
667 * if we haven't received a response for oldreq,
668 * remove it from the list
669 */
670 if (oldreq->status == REQ_STATUS_SENT)
671 if (c->trans_mod->cancelled)
672 c->trans_mod->cancelled(c, oldreq);
673
674 p9_free_req(c, req);
675 return 0;
676 }
677
678 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
679 int8_t type, int req_size,
680 const char *fmt, va_list ap)
681 {
682 int tag, err;
683 struct p9_req_t *req;
684
685 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
686
687 /* we allow for any status other than disconnected */
688 if (c->status == Disconnected)
689 return ERR_PTR(-EIO);
690
691 /* if status is begin_disconnected we allow only clunk request */
692 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
693 return ERR_PTR(-EIO);
694
695 tag = P9_NOTAG;
696 if (type != P9_TVERSION) {
697 tag = p9_idpool_get(c->tagpool);
698 if (tag < 0)
699 return ERR_PTR(-ENOMEM);
700 }
701
702 req = p9_tag_alloc(c, tag, req_size);
703 if (IS_ERR(req))
704 return req;
705
706 /* marshall the data */
707 p9pdu_prepare(req->tc, tag, type);
708 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
709 if (err)
710 goto reterr;
711 p9pdu_finalize(c, req->tc);
712 trace_9p_client_req(c, type, tag);
713 return req;
714 reterr:
715 p9_free_req(c, req);
716 return ERR_PTR(err);
717 }
718
719 /**
720 * p9_client_rpc - issue a request and wait for a response
721 * @c: client session
722 * @type: type of request
723 * @fmt: protocol format string (see protocol.c)
724 *
725 * Returns request structure (which client must free using p9_free_req)
726 */
727
728 static struct p9_req_t *
729 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
730 {
731 va_list ap;
732 int sigpending, err;
733 unsigned long flags;
734 struct p9_req_t *req;
735
736 va_start(ap, fmt);
737 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
738 va_end(ap);
739 if (IS_ERR(req))
740 return req;
741
742 if (signal_pending(current)) {
743 sigpending = 1;
744 clear_thread_flag(TIF_SIGPENDING);
745 } else
746 sigpending = 0;
747
748 err = c->trans_mod->request(c, req);
749 if (err < 0) {
750 if (err != -ERESTARTSYS && err != -EFAULT)
751 c->status = Disconnected;
752 goto reterr;
753 }
754 again:
755 /* Wait for the response */
756 err = wait_event_interruptible(*req->wq,
757 req->status >= REQ_STATUS_RCVD);
758
759 /*
760 * Make sure our req is coherent with regard to updates in other
761 * threads - echoes to wmb() in the callback
762 */
763 smp_rmb();
764
765 if ((err == -ERESTARTSYS) && (c->status == Connected)
766 && (type == P9_TFLUSH)) {
767 sigpending = 1;
768 clear_thread_flag(TIF_SIGPENDING);
769 goto again;
770 }
771
772 if (req->status == REQ_STATUS_ERROR) {
773 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
774 err = req->t_err;
775 }
776 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
777 p9_debug(P9_DEBUG_MUX, "flushing\n");
778 sigpending = 1;
779 clear_thread_flag(TIF_SIGPENDING);
780
781 if (c->trans_mod->cancel(c, req))
782 p9_client_flush(c, req);
783
784 /* if we received the response anyway, don't signal error */
785 if (req->status == REQ_STATUS_RCVD)
786 err = 0;
787 }
788 if (sigpending) {
789 spin_lock_irqsave(&current->sighand->siglock, flags);
790 recalc_sigpending();
791 spin_unlock_irqrestore(&current->sighand->siglock, flags);
792 }
793 if (err < 0)
794 goto reterr;
795
796 err = p9_check_errors(c, req);
797 trace_9p_client_res(c, type, req->rc->tag, err);
798 if (!err)
799 return req;
800 reterr:
801 p9_free_req(c, req);
802 return ERR_PTR(safe_errno(err));
803 }
804
805 /**
806 * p9_client_zc_rpc - issue a request and wait for a response
807 * @c: client session
808 * @type: type of request
809 * @uidata: user bffer that should be ued for zero copy read
810 * @uodata: user buffer that shoud be user for zero copy write
811 * @inlen: read buffer size
812 * @olen: write buffer size
813 * @hdrlen: reader header size, This is the size of response protocol data
814 * @fmt: protocol format string (see protocol.c)
815 *
816 * Returns request structure (which client must free using p9_free_req)
817 */
818 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
819 char *uidata, char *uodata,
820 int inlen, int olen, int in_hdrlen,
821 int kern_buf, const char *fmt, ...)
822 {
823 va_list ap;
824 int sigpending, err;
825 unsigned long flags;
826 struct p9_req_t *req;
827
828 va_start(ap, fmt);
829 /*
830 * We allocate a inline protocol data of only 4k bytes.
831 * The actual content is passed in zero-copy fashion.
832 */
833 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
834 va_end(ap);
835 if (IS_ERR(req))
836 return req;
837
838 if (signal_pending(current)) {
839 sigpending = 1;
840 clear_thread_flag(TIF_SIGPENDING);
841 } else
842 sigpending = 0;
843
844 /* If we are called with KERNEL_DS force kern_buf */
845 if (segment_eq(get_fs(), KERNEL_DS))
846 kern_buf = 1;
847
848 err = c->trans_mod->zc_request(c, req, uidata, uodata,
849 inlen, olen, in_hdrlen, kern_buf);
850 if (err < 0) {
851 if (err == -EIO)
852 c->status = Disconnected;
853 goto reterr;
854 }
855 if (req->status == REQ_STATUS_ERROR) {
856 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
857 err = req->t_err;
858 }
859 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
860 p9_debug(P9_DEBUG_MUX, "flushing\n");
861 sigpending = 1;
862 clear_thread_flag(TIF_SIGPENDING);
863
864 if (c->trans_mod->cancel(c, req))
865 p9_client_flush(c, req);
866
867 /* if we received the response anyway, don't signal error */
868 if (req->status == REQ_STATUS_RCVD)
869 err = 0;
870 }
871 if (sigpending) {
872 spin_lock_irqsave(&current->sighand->siglock, flags);
873 recalc_sigpending();
874 spin_unlock_irqrestore(&current->sighand->siglock, flags);
875 }
876 if (err < 0)
877 goto reterr;
878
879 err = p9_check_zc_errors(c, req, uidata, in_hdrlen, kern_buf);
880 trace_9p_client_res(c, type, req->rc->tag, err);
881 if (!err)
882 return req;
883 reterr:
884 p9_free_req(c, req);
885 return ERR_PTR(safe_errno(err));
886 }
887
888 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
889 {
890 int ret;
891 struct p9_fid *fid;
892 unsigned long flags;
893
894 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
895 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
896 if (!fid)
897 return ERR_PTR(-ENOMEM);
898
899 ret = p9_idpool_get(clnt->fidpool);
900 if (ret < 0) {
901 ret = -ENOSPC;
902 goto error;
903 }
904 fid->fid = ret;
905
906 memset(&fid->qid, 0, sizeof(struct p9_qid));
907 fid->mode = -1;
908 fid->uid = current_fsuid();
909 fid->clnt = clnt;
910 fid->rdir = NULL;
911 spin_lock_irqsave(&clnt->lock, flags);
912 list_add(&fid->flist, &clnt->fidlist);
913 spin_unlock_irqrestore(&clnt->lock, flags);
914
915 return fid;
916
917 error:
918 kfree(fid);
919 return ERR_PTR(ret);
920 }
921
922 static void p9_fid_destroy(struct p9_fid *fid)
923 {
924 struct p9_client *clnt;
925 unsigned long flags;
926
927 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
928 clnt = fid->clnt;
929 p9_idpool_put(fid->fid, clnt->fidpool);
930 spin_lock_irqsave(&clnt->lock, flags);
931 list_del(&fid->flist);
932 spin_unlock_irqrestore(&clnt->lock, flags);
933 kfree(fid->rdir);
934 kfree(fid);
935 }
936
937 static int p9_client_version(struct p9_client *c)
938 {
939 int err = 0;
940 struct p9_req_t *req;
941 char *version;
942 int msize;
943
944 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
945 c->msize, c->proto_version);
946
947 switch (c->proto_version) {
948 case p9_proto_2000L:
949 req = p9_client_rpc(c, P9_TVERSION, "ds",
950 c->msize, "9P2000.L");
951 break;
952 case p9_proto_2000u:
953 req = p9_client_rpc(c, P9_TVERSION, "ds",
954 c->msize, "9P2000.u");
955 break;
956 case p9_proto_legacy:
957 req = p9_client_rpc(c, P9_TVERSION, "ds",
958 c->msize, "9P2000");
959 break;
960 default:
961 return -EINVAL;
962 break;
963 }
964
965 if (IS_ERR(req))
966 return PTR_ERR(req);
967
968 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
969 if (err) {
970 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
971 trace_9p_protocol_dump(c, req->rc);
972 goto error;
973 }
974
975 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
976 if (!strncmp(version, "9P2000.L", 8))
977 c->proto_version = p9_proto_2000L;
978 else if (!strncmp(version, "9P2000.u", 8))
979 c->proto_version = p9_proto_2000u;
980 else if (!strncmp(version, "9P2000", 6))
981 c->proto_version = p9_proto_legacy;
982 else {
983 err = -EREMOTEIO;
984 goto error;
985 }
986
987 if (msize < c->msize)
988 c->msize = msize;
989
990 error:
991 kfree(version);
992 p9_free_req(c, req);
993
994 return err;
995 }
996
997 struct p9_client *p9_client_create(const char *dev_name, char *options)
998 {
999 int err;
1000 struct p9_client *clnt;
1001 char *client_id;
1002
1003 err = 0;
1004 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
1005 if (!clnt)
1006 return ERR_PTR(-ENOMEM);
1007
1008 clnt->trans_mod = NULL;
1009 clnt->trans = NULL;
1010
1011 client_id = utsname()->nodename;
1012 memcpy(clnt->name, client_id, strlen(client_id) + 1);
1013
1014 spin_lock_init(&clnt->lock);
1015 INIT_LIST_HEAD(&clnt->fidlist);
1016
1017 err = p9_tag_init(clnt);
1018 if (err < 0)
1019 goto free_client;
1020
1021 err = parse_opts(options, clnt);
1022 if (err < 0)
1023 goto destroy_tagpool;
1024
1025 if (!clnt->trans_mod)
1026 clnt->trans_mod = v9fs_get_default_trans();
1027
1028 if (clnt->trans_mod == NULL) {
1029 err = -EPROTONOSUPPORT;
1030 p9_debug(P9_DEBUG_ERROR,
1031 "No transport defined or default transport\n");
1032 goto destroy_tagpool;
1033 }
1034
1035 clnt->fidpool = p9_idpool_create();
1036 if (IS_ERR(clnt->fidpool)) {
1037 err = PTR_ERR(clnt->fidpool);
1038 goto put_trans;
1039 }
1040
1041 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1042 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1043
1044 err = clnt->trans_mod->create(clnt, dev_name, options);
1045 if (err)
1046 goto destroy_fidpool;
1047
1048 if (clnt->msize > clnt->trans_mod->maxsize)
1049 clnt->msize = clnt->trans_mod->maxsize;
1050
1051 err = p9_client_version(clnt);
1052 if (err)
1053 goto close_trans;
1054
1055 return clnt;
1056
1057 close_trans:
1058 clnt->trans_mod->close(clnt);
1059 destroy_fidpool:
1060 p9_idpool_destroy(clnt->fidpool);
1061 put_trans:
1062 v9fs_put_trans(clnt->trans_mod);
1063 destroy_tagpool:
1064 p9_idpool_destroy(clnt->tagpool);
1065 free_client:
1066 kfree(clnt);
1067 return ERR_PTR(err);
1068 }
1069 EXPORT_SYMBOL(p9_client_create);
1070
1071 void p9_client_destroy(struct p9_client *clnt)
1072 {
1073 struct p9_fid *fid, *fidptr;
1074
1075 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1076
1077 if (clnt->trans_mod)
1078 clnt->trans_mod->close(clnt);
1079
1080 v9fs_put_trans(clnt->trans_mod);
1081
1082 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
1083 pr_info("Found fid %d not clunked\n", fid->fid);
1084 p9_fid_destroy(fid);
1085 }
1086
1087 if (clnt->fidpool)
1088 p9_idpool_destroy(clnt->fidpool);
1089
1090 p9_tag_cleanup(clnt);
1091
1092 kfree(clnt);
1093 }
1094 EXPORT_SYMBOL(p9_client_destroy);
1095
1096 void p9_client_disconnect(struct p9_client *clnt)
1097 {
1098 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1099 clnt->status = Disconnected;
1100 }
1101 EXPORT_SYMBOL(p9_client_disconnect);
1102
1103 void p9_client_begin_disconnect(struct p9_client *clnt)
1104 {
1105 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1106 clnt->status = BeginDisconnect;
1107 }
1108 EXPORT_SYMBOL(p9_client_begin_disconnect);
1109
1110 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1111 char *uname, kuid_t n_uname, char *aname)
1112 {
1113 int err = 0;
1114 struct p9_req_t *req;
1115 struct p9_fid *fid;
1116 struct p9_qid qid;
1117
1118
1119 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1120 afid ? afid->fid : -1, uname, aname);
1121 fid = p9_fid_create(clnt);
1122 if (IS_ERR(fid)) {
1123 err = PTR_ERR(fid);
1124 fid = NULL;
1125 goto error;
1126 }
1127
1128 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1129 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1130 if (IS_ERR(req)) {
1131 err = PTR_ERR(req);
1132 goto error;
1133 }
1134
1135 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
1136 if (err) {
1137 trace_9p_protocol_dump(clnt, req->rc);
1138 p9_free_req(clnt, req);
1139 goto error;
1140 }
1141
1142 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1143 qid.type, (unsigned long long)qid.path, qid.version);
1144
1145 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1146
1147 p9_free_req(clnt, req);
1148 return fid;
1149
1150 error:
1151 if (fid)
1152 p9_fid_destroy(fid);
1153 return ERR_PTR(err);
1154 }
1155 EXPORT_SYMBOL(p9_client_attach);
1156
1157 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1158 char **wnames, int clone)
1159 {
1160 int err;
1161 struct p9_client *clnt;
1162 struct p9_fid *fid;
1163 struct p9_qid *wqids;
1164 struct p9_req_t *req;
1165 uint16_t nwqids, count;
1166
1167 err = 0;
1168 wqids = NULL;
1169 clnt = oldfid->clnt;
1170 if (clone) {
1171 fid = p9_fid_create(clnt);
1172 if (IS_ERR(fid)) {
1173 err = PTR_ERR(fid);
1174 fid = NULL;
1175 goto error;
1176 }
1177
1178 fid->uid = oldfid->uid;
1179 } else
1180 fid = oldfid;
1181
1182
1183 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1184 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1185
1186 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1187 nwname, wnames);
1188 if (IS_ERR(req)) {
1189 err = PTR_ERR(req);
1190 goto error;
1191 }
1192
1193 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1194 if (err) {
1195 trace_9p_protocol_dump(clnt, req->rc);
1196 p9_free_req(clnt, req);
1197 goto clunk_fid;
1198 }
1199 p9_free_req(clnt, req);
1200
1201 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1202
1203 if (nwqids != nwname) {
1204 err = -ENOENT;
1205 goto clunk_fid;
1206 }
1207
1208 for (count = 0; count < nwqids; count++)
1209 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1210 count, wqids[count].type,
1211 (unsigned long long)wqids[count].path,
1212 wqids[count].version);
1213
1214 if (nwname)
1215 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1216 else
1217 fid->qid = oldfid->qid;
1218
1219 kfree(wqids);
1220 return fid;
1221
1222 clunk_fid:
1223 kfree(wqids);
1224 p9_client_clunk(fid);
1225 fid = NULL;
1226
1227 error:
1228 if (fid && (fid != oldfid))
1229 p9_fid_destroy(fid);
1230
1231 return ERR_PTR(err);
1232 }
1233 EXPORT_SYMBOL(p9_client_walk);
1234
1235 int p9_client_open(struct p9_fid *fid, int mode)
1236 {
1237 int err;
1238 struct p9_client *clnt;
1239 struct p9_req_t *req;
1240 struct p9_qid qid;
1241 int iounit;
1242
1243 clnt = fid->clnt;
1244 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1245 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1246 err = 0;
1247
1248 if (fid->mode != -1)
1249 return -EINVAL;
1250
1251 if (p9_is_proto_dotl(clnt))
1252 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1253 else
1254 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1255 if (IS_ERR(req)) {
1256 err = PTR_ERR(req);
1257 goto error;
1258 }
1259
1260 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1261 if (err) {
1262 trace_9p_protocol_dump(clnt, req->rc);
1263 goto free_and_error;
1264 }
1265
1266 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1267 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1268 (unsigned long long)qid.path, qid.version, iounit);
1269
1270 fid->mode = mode;
1271 fid->iounit = iounit;
1272
1273 free_and_error:
1274 p9_free_req(clnt, req);
1275 error:
1276 return err;
1277 }
1278 EXPORT_SYMBOL(p9_client_open);
1279
1280 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1281 kgid_t gid, struct p9_qid *qid)
1282 {
1283 int err = 0;
1284 struct p9_client *clnt;
1285 struct p9_req_t *req;
1286 int iounit;
1287
1288 p9_debug(P9_DEBUG_9P,
1289 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1290 ofid->fid, name, flags, mode,
1291 from_kgid(&init_user_ns, gid));
1292 clnt = ofid->clnt;
1293
1294 if (ofid->mode != -1)
1295 return -EINVAL;
1296
1297 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1298 mode, gid);
1299 if (IS_ERR(req)) {
1300 err = PTR_ERR(req);
1301 goto error;
1302 }
1303
1304 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1305 if (err) {
1306 trace_9p_protocol_dump(clnt, req->rc);
1307 goto free_and_error;
1308 }
1309
1310 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1311 qid->type,
1312 (unsigned long long)qid->path,
1313 qid->version, iounit);
1314
1315 ofid->mode = mode;
1316 ofid->iounit = iounit;
1317
1318 free_and_error:
1319 p9_free_req(clnt, req);
1320 error:
1321 return err;
1322 }
1323 EXPORT_SYMBOL(p9_client_create_dotl);
1324
1325 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1326 char *extension)
1327 {
1328 int err;
1329 struct p9_client *clnt;
1330 struct p9_req_t *req;
1331 struct p9_qid qid;
1332 int iounit;
1333
1334 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1335 fid->fid, name, perm, mode);
1336 err = 0;
1337 clnt = fid->clnt;
1338
1339 if (fid->mode != -1)
1340 return -EINVAL;
1341
1342 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1343 mode, extension);
1344 if (IS_ERR(req)) {
1345 err = PTR_ERR(req);
1346 goto error;
1347 }
1348
1349 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1350 if (err) {
1351 trace_9p_protocol_dump(clnt, req->rc);
1352 goto free_and_error;
1353 }
1354
1355 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1356 qid.type,
1357 (unsigned long long)qid.path,
1358 qid.version, iounit);
1359
1360 fid->mode = mode;
1361 fid->iounit = iounit;
1362
1363 free_and_error:
1364 p9_free_req(clnt, req);
1365 error:
1366 return err;
1367 }
1368 EXPORT_SYMBOL(p9_client_fcreate);
1369
1370 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, kgid_t gid,
1371 struct p9_qid *qid)
1372 {
1373 int err = 0;
1374 struct p9_client *clnt;
1375 struct p9_req_t *req;
1376
1377 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1378 dfid->fid, name, symtgt);
1379 clnt = dfid->clnt;
1380
1381 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1382 gid);
1383 if (IS_ERR(req)) {
1384 err = PTR_ERR(req);
1385 goto error;
1386 }
1387
1388 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1389 if (err) {
1390 trace_9p_protocol_dump(clnt, req->rc);
1391 goto free_and_error;
1392 }
1393
1394 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1395 qid->type, (unsigned long long)qid->path, qid->version);
1396
1397 free_and_error:
1398 p9_free_req(clnt, req);
1399 error:
1400 return err;
1401 }
1402 EXPORT_SYMBOL(p9_client_symlink);
1403
1404 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1405 {
1406 struct p9_client *clnt;
1407 struct p9_req_t *req;
1408
1409 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1410 dfid->fid, oldfid->fid, newname);
1411 clnt = dfid->clnt;
1412 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1413 newname);
1414 if (IS_ERR(req))
1415 return PTR_ERR(req);
1416
1417 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1418 p9_free_req(clnt, req);
1419 return 0;
1420 }
1421 EXPORT_SYMBOL(p9_client_link);
1422
1423 int p9_client_fsync(struct p9_fid *fid, int datasync)
1424 {
1425 int err;
1426 struct p9_client *clnt;
1427 struct p9_req_t *req;
1428
1429 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1430 fid->fid, datasync);
1431 err = 0;
1432 clnt = fid->clnt;
1433
1434 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1435 if (IS_ERR(req)) {
1436 err = PTR_ERR(req);
1437 goto error;
1438 }
1439
1440 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1441
1442 p9_free_req(clnt, req);
1443
1444 error:
1445 return err;
1446 }
1447 EXPORT_SYMBOL(p9_client_fsync);
1448
1449 int p9_client_clunk(struct p9_fid *fid)
1450 {
1451 int err;
1452 struct p9_client *clnt;
1453 struct p9_req_t *req;
1454 int retries = 0;
1455
1456 if (!fid) {
1457 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1458 __func__, task_pid_nr(current));
1459 dump_stack();
1460 return 0;
1461 }
1462
1463 again:
1464 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1465 retries);
1466 err = 0;
1467 clnt = fid->clnt;
1468
1469 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1470 if (IS_ERR(req)) {
1471 err = PTR_ERR(req);
1472 goto error;
1473 }
1474
1475 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1476
1477 p9_free_req(clnt, req);
1478 error:
1479 /*
1480 * Fid is not valid even after a failed clunk
1481 * If interrupted, retry once then give up and
1482 * leak fid until umount.
1483 */
1484 if (err == -ERESTARTSYS) {
1485 if (retries++ == 0)
1486 goto again;
1487 } else
1488 p9_fid_destroy(fid);
1489 return err;
1490 }
1491 EXPORT_SYMBOL(p9_client_clunk);
1492
1493 int p9_client_remove(struct p9_fid *fid)
1494 {
1495 int err;
1496 struct p9_client *clnt;
1497 struct p9_req_t *req;
1498
1499 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1500 err = 0;
1501 clnt = fid->clnt;
1502
1503 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1504 if (IS_ERR(req)) {
1505 err = PTR_ERR(req);
1506 goto error;
1507 }
1508
1509 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1510
1511 p9_free_req(clnt, req);
1512 error:
1513 if (err == -ERESTARTSYS)
1514 p9_client_clunk(fid);
1515 else
1516 p9_fid_destroy(fid);
1517 return err;
1518 }
1519 EXPORT_SYMBOL(p9_client_remove);
1520
1521 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1522 {
1523 int err = 0;
1524 struct p9_req_t *req;
1525 struct p9_client *clnt;
1526
1527 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1528 dfid->fid, name, flags);
1529
1530 clnt = dfid->clnt;
1531 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1532 if (IS_ERR(req)) {
1533 err = PTR_ERR(req);
1534 goto error;
1535 }
1536 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1537
1538 p9_free_req(clnt, req);
1539 error:
1540 return err;
1541 }
1542 EXPORT_SYMBOL(p9_client_unlinkat);
1543
1544 int
1545 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1546 u32 count)
1547 {
1548 char *dataptr;
1549 int kernel_buf = 0;
1550 struct p9_req_t *req;
1551 struct p9_client *clnt;
1552 int err, rsize, non_zc = 0;
1553
1554
1555 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1556 fid->fid, (unsigned long long) offset, count);
1557 err = 0;
1558 clnt = fid->clnt;
1559
1560 rsize = fid->iounit;
1561 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1562 rsize = clnt->msize - P9_IOHDRSZ;
1563
1564 if (count < rsize)
1565 rsize = count;
1566
1567 /* Don't bother zerocopy for small IO (< 1024) */
1568 if (clnt->trans_mod->zc_request && rsize > 1024) {
1569 char *indata;
1570 if (data) {
1571 kernel_buf = 1;
1572 indata = data;
1573 } else
1574 indata = (__force char *)udata;
1575 /*
1576 * response header len is 11
1577 * PDU Header(7) + IO Size (4)
1578 */
1579 req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0,
1580 11, kernel_buf, "dqd", fid->fid,
1581 offset, rsize);
1582 } else {
1583 non_zc = 1;
1584 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1585 rsize);
1586 }
1587 if (IS_ERR(req)) {
1588 err = PTR_ERR(req);
1589 goto error;
1590 }
1591
1592 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1593 if (err) {
1594 trace_9p_protocol_dump(clnt, req->rc);
1595 goto free_and_error;
1596 }
1597
1598 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1599
1600 if (non_zc) {
1601 if (data) {
1602 memmove(data, dataptr, count);
1603 } else {
1604 err = copy_to_user(udata, dataptr, count);
1605 if (err) {
1606 err = -EFAULT;
1607 goto free_and_error;
1608 }
1609 }
1610 }
1611 p9_free_req(clnt, req);
1612 return count;
1613
1614 free_and_error:
1615 p9_free_req(clnt, req);
1616 error:
1617 return err;
1618 }
1619 EXPORT_SYMBOL(p9_client_read);
1620
1621 int
1622 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1623 u64 offset, u32 count)
1624 {
1625 int err, rsize;
1626 int kernel_buf = 0;
1627 struct p9_client *clnt;
1628 struct p9_req_t *req;
1629
1630 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1631 fid->fid, (unsigned long long) offset, count);
1632 err = 0;
1633 clnt = fid->clnt;
1634
1635 rsize = fid->iounit;
1636 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1637 rsize = clnt->msize - P9_IOHDRSZ;
1638
1639 if (count < rsize)
1640 rsize = count;
1641
1642 /* Don't bother zerocopy for small IO (< 1024) */
1643 if (clnt->trans_mod->zc_request && rsize > 1024) {
1644 char *odata;
1645 if (data) {
1646 kernel_buf = 1;
1647 odata = data;
1648 } else
1649 odata = (char *)udata;
1650 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize,
1651 P9_ZC_HDR_SZ, kernel_buf, "dqd",
1652 fid->fid, offset, rsize);
1653 } else {
1654 if (data)
1655 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
1656 offset, rsize, data);
1657 else
1658 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
1659 offset, rsize, udata);
1660 }
1661 if (IS_ERR(req)) {
1662 err = PTR_ERR(req);
1663 goto error;
1664 }
1665
1666 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1667 if (err) {
1668 trace_9p_protocol_dump(clnt, req->rc);
1669 goto free_and_error;
1670 }
1671
1672 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1673
1674 p9_free_req(clnt, req);
1675 return count;
1676
1677 free_and_error:
1678 p9_free_req(clnt, req);
1679 error:
1680 return err;
1681 }
1682 EXPORT_SYMBOL(p9_client_write);
1683
1684 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1685 {
1686 int err;
1687 struct p9_client *clnt;
1688 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1689 struct p9_req_t *req;
1690 u16 ignored;
1691
1692 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1693
1694 if (!ret)
1695 return ERR_PTR(-ENOMEM);
1696
1697 err = 0;
1698 clnt = fid->clnt;
1699
1700 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1701 if (IS_ERR(req)) {
1702 err = PTR_ERR(req);
1703 goto error;
1704 }
1705
1706 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1707 if (err) {
1708 trace_9p_protocol_dump(clnt, req->rc);
1709 p9_free_req(clnt, req);
1710 goto error;
1711 }
1712
1713 p9_debug(P9_DEBUG_9P,
1714 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1715 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1716 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1717 "<<< uid=%d gid=%d n_muid=%d\n",
1718 ret->size, ret->type, ret->dev, ret->qid.type,
1719 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1720 ret->atime, ret->mtime, (unsigned long long)ret->length,
1721 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1722 from_kuid(&init_user_ns, ret->n_uid),
1723 from_kgid(&init_user_ns, ret->n_gid),
1724 from_kuid(&init_user_ns, ret->n_muid));
1725
1726 p9_free_req(clnt, req);
1727 return ret;
1728
1729 error:
1730 kfree(ret);
1731 return ERR_PTR(err);
1732 }
1733 EXPORT_SYMBOL(p9_client_stat);
1734
1735 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1736 u64 request_mask)
1737 {
1738 int err;
1739 struct p9_client *clnt;
1740 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1741 GFP_KERNEL);
1742 struct p9_req_t *req;
1743
1744 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1745 fid->fid, request_mask);
1746
1747 if (!ret)
1748 return ERR_PTR(-ENOMEM);
1749
1750 err = 0;
1751 clnt = fid->clnt;
1752
1753 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1754 if (IS_ERR(req)) {
1755 err = PTR_ERR(req);
1756 goto error;
1757 }
1758
1759 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1760 if (err) {
1761 trace_9p_protocol_dump(clnt, req->rc);
1762 p9_free_req(clnt, req);
1763 goto error;
1764 }
1765
1766 p9_debug(P9_DEBUG_9P,
1767 "<<< RGETATTR st_result_mask=%lld\n"
1768 "<<< qid=%x.%llx.%x\n"
1769 "<<< st_mode=%8.8x st_nlink=%llu\n"
1770 "<<< st_uid=%d st_gid=%d\n"
1771 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1772 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1773 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1774 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1775 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1776 "<<< st_gen=%lld st_data_version=%lld",
1777 ret->st_result_mask, ret->qid.type, ret->qid.path,
1778 ret->qid.version, ret->st_mode, ret->st_nlink,
1779 from_kuid(&init_user_ns, ret->st_uid),
1780 from_kgid(&init_user_ns, ret->st_gid),
1781 ret->st_rdev, ret->st_size, ret->st_blksize,
1782 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1783 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1784 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1785 ret->st_gen, ret->st_data_version);
1786
1787 p9_free_req(clnt, req);
1788 return ret;
1789
1790 error:
1791 kfree(ret);
1792 return ERR_PTR(err);
1793 }
1794 EXPORT_SYMBOL(p9_client_getattr_dotl);
1795
1796 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1797 {
1798 int ret;
1799
1800 /* NOTE: size shouldn't include its own length */
1801 /* size[2] type[2] dev[4] qid[13] */
1802 /* mode[4] atime[4] mtime[4] length[8]*/
1803 /* name[s] uid[s] gid[s] muid[s] */
1804 ret = 2+4+13+4+4+4+8+2+2+2+2;
1805
1806 if (wst->name)
1807 ret += strlen(wst->name);
1808 if (wst->uid)
1809 ret += strlen(wst->uid);
1810 if (wst->gid)
1811 ret += strlen(wst->gid);
1812 if (wst->muid)
1813 ret += strlen(wst->muid);
1814
1815 if ((proto_version == p9_proto_2000u) ||
1816 (proto_version == p9_proto_2000L)) {
1817 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1818 if (wst->extension)
1819 ret += strlen(wst->extension);
1820 }
1821
1822 return ret;
1823 }
1824
1825 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1826 {
1827 int err;
1828 struct p9_req_t *req;
1829 struct p9_client *clnt;
1830
1831 err = 0;
1832 clnt = fid->clnt;
1833 wst->size = p9_client_statsize(wst, clnt->proto_version);
1834 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1835 p9_debug(P9_DEBUG_9P,
1836 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1837 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1838 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1839 " uid=%d gid=%d n_muid=%d\n",
1840 wst->size, wst->type, wst->dev, wst->qid.type,
1841 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1842 wst->atime, wst->mtime, (unsigned long long)wst->length,
1843 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1844 from_kuid(&init_user_ns, wst->n_uid),
1845 from_kgid(&init_user_ns, wst->n_gid),
1846 from_kuid(&init_user_ns, wst->n_muid));
1847
1848 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1849 if (IS_ERR(req)) {
1850 err = PTR_ERR(req);
1851 goto error;
1852 }
1853
1854 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1855
1856 p9_free_req(clnt, req);
1857 error:
1858 return err;
1859 }
1860 EXPORT_SYMBOL(p9_client_wstat);
1861
1862 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1863 {
1864 int err;
1865 struct p9_req_t *req;
1866 struct p9_client *clnt;
1867
1868 err = 0;
1869 clnt = fid->clnt;
1870 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1871 p9_debug(P9_DEBUG_9P,
1872 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1873 " atime_sec=%lld atime_nsec=%lld\n"
1874 " mtime_sec=%lld mtime_nsec=%lld\n",
1875 p9attr->valid, p9attr->mode,
1876 from_kuid(&init_user_ns, p9attr->uid),
1877 from_kgid(&init_user_ns, p9attr->gid),
1878 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1879 p9attr->mtime_sec, p9attr->mtime_nsec);
1880
1881 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1882
1883 if (IS_ERR(req)) {
1884 err = PTR_ERR(req);
1885 goto error;
1886 }
1887 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1888 p9_free_req(clnt, req);
1889 error:
1890 return err;
1891 }
1892 EXPORT_SYMBOL(p9_client_setattr);
1893
1894 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1895 {
1896 int err;
1897 struct p9_req_t *req;
1898 struct p9_client *clnt;
1899
1900 err = 0;
1901 clnt = fid->clnt;
1902
1903 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1904
1905 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1906 if (IS_ERR(req)) {
1907 err = PTR_ERR(req);
1908 goto error;
1909 }
1910
1911 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1912 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1913 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1914 if (err) {
1915 trace_9p_protocol_dump(clnt, req->rc);
1916 p9_free_req(clnt, req);
1917 goto error;
1918 }
1919
1920 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1921 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1922 "fsid %llu namelen %ld\n",
1923 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1924 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1925 sb->fsid, (long int)sb->namelen);
1926
1927 p9_free_req(clnt, req);
1928 error:
1929 return err;
1930 }
1931 EXPORT_SYMBOL(p9_client_statfs);
1932
1933 int p9_client_rename(struct p9_fid *fid,
1934 struct p9_fid *newdirfid, const char *name)
1935 {
1936 int err;
1937 struct p9_req_t *req;
1938 struct p9_client *clnt;
1939
1940 err = 0;
1941 clnt = fid->clnt;
1942
1943 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1944 fid->fid, newdirfid->fid, name);
1945
1946 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1947 newdirfid->fid, name);
1948 if (IS_ERR(req)) {
1949 err = PTR_ERR(req);
1950 goto error;
1951 }
1952
1953 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1954
1955 p9_free_req(clnt, req);
1956 error:
1957 return err;
1958 }
1959 EXPORT_SYMBOL(p9_client_rename);
1960
1961 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1962 struct p9_fid *newdirfid, const char *new_name)
1963 {
1964 int err;
1965 struct p9_req_t *req;
1966 struct p9_client *clnt;
1967
1968 err = 0;
1969 clnt = olddirfid->clnt;
1970
1971 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1972 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1973 newdirfid->fid, new_name);
1974
1975 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1976 old_name, newdirfid->fid, new_name);
1977 if (IS_ERR(req)) {
1978 err = PTR_ERR(req);
1979 goto error;
1980 }
1981
1982 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1983 newdirfid->fid, new_name);
1984
1985 p9_free_req(clnt, req);
1986 error:
1987 return err;
1988 }
1989 EXPORT_SYMBOL(p9_client_renameat);
1990
1991 /*
1992 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1993 */
1994 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1995 const char *attr_name, u64 *attr_size)
1996 {
1997 int err;
1998 struct p9_req_t *req;
1999 struct p9_client *clnt;
2000 struct p9_fid *attr_fid;
2001
2002 err = 0;
2003 clnt = file_fid->clnt;
2004 attr_fid = p9_fid_create(clnt);
2005 if (IS_ERR(attr_fid)) {
2006 err = PTR_ERR(attr_fid);
2007 attr_fid = NULL;
2008 goto error;
2009 }
2010 p9_debug(P9_DEBUG_9P,
2011 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
2012 file_fid->fid, attr_fid->fid, attr_name);
2013
2014 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
2015 file_fid->fid, attr_fid->fid, attr_name);
2016 if (IS_ERR(req)) {
2017 err = PTR_ERR(req);
2018 goto error;
2019 }
2020 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
2021 if (err) {
2022 trace_9p_protocol_dump(clnt, req->rc);
2023 p9_free_req(clnt, req);
2024 goto clunk_fid;
2025 }
2026 p9_free_req(clnt, req);
2027 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2028 attr_fid->fid, *attr_size);
2029 return attr_fid;
2030 clunk_fid:
2031 p9_client_clunk(attr_fid);
2032 attr_fid = NULL;
2033 error:
2034 if (attr_fid && (attr_fid != file_fid))
2035 p9_fid_destroy(attr_fid);
2036
2037 return ERR_PTR(err);
2038 }
2039 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2040
2041 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2042 u64 attr_size, int flags)
2043 {
2044 int err;
2045 struct p9_req_t *req;
2046 struct p9_client *clnt;
2047
2048 p9_debug(P9_DEBUG_9P,
2049 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2050 fid->fid, name, (long long)attr_size, flags);
2051 err = 0;
2052 clnt = fid->clnt;
2053 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2054 fid->fid, name, attr_size, flags);
2055 if (IS_ERR(req)) {
2056 err = PTR_ERR(req);
2057 goto error;
2058 }
2059 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2060 p9_free_req(clnt, req);
2061 error:
2062 return err;
2063 }
2064 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2065
2066 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2067 {
2068 int err, rsize, non_zc = 0;
2069 struct p9_client *clnt;
2070 struct p9_req_t *req;
2071 char *dataptr;
2072
2073 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2074 fid->fid, (unsigned long long) offset, count);
2075
2076 err = 0;
2077 clnt = fid->clnt;
2078
2079 rsize = fid->iounit;
2080 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2081 rsize = clnt->msize - P9_READDIRHDRSZ;
2082
2083 if (count < rsize)
2084 rsize = count;
2085
2086 /* Don't bother zerocopy for small IO (< 1024) */
2087 if (clnt->trans_mod->zc_request && rsize > 1024) {
2088 /*
2089 * response header len is 11
2090 * PDU Header(7) + IO Size (4)
2091 */
2092 req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0,
2093 11, 1, "dqd", fid->fid, offset, rsize);
2094 } else {
2095 non_zc = 1;
2096 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2097 offset, rsize);
2098 }
2099 if (IS_ERR(req)) {
2100 err = PTR_ERR(req);
2101 goto error;
2102 }
2103
2104 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2105 if (err) {
2106 trace_9p_protocol_dump(clnt, req->rc);
2107 goto free_and_error;
2108 }
2109
2110 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2111
2112 if (non_zc)
2113 memmove(data, dataptr, count);
2114
2115 p9_free_req(clnt, req);
2116 return count;
2117
2118 free_and_error:
2119 p9_free_req(clnt, req);
2120 error:
2121 return err;
2122 }
2123 EXPORT_SYMBOL(p9_client_readdir);
2124
2125 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
2126 dev_t rdev, kgid_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, ">>> TMKNOD fid %d name %s mode %d major %d "
2135 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2136 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2137 MAJOR(rdev), MINOR(rdev), 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, "<<< RMKNOD 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_mknod_dotl);
2155
2156 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
2157 kgid_t gid, struct p9_qid *qid)
2158 {
2159 int err;
2160 struct p9_client *clnt;
2161 struct p9_req_t *req;
2162
2163 err = 0;
2164 clnt = fid->clnt;
2165 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2166 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2167 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
2168 gid);
2169 if (IS_ERR(req))
2170 return PTR_ERR(req);
2171
2172 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2173 if (err) {
2174 trace_9p_protocol_dump(clnt, req->rc);
2175 goto error;
2176 }
2177 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2178 (unsigned long long)qid->path, qid->version);
2179
2180 error:
2181 p9_free_req(clnt, req);
2182 return err;
2183
2184 }
2185 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2186
2187 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2188 {
2189 int err;
2190 struct p9_client *clnt;
2191 struct p9_req_t *req;
2192
2193 err = 0;
2194 clnt = fid->clnt;
2195 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2196 "start %lld length %lld proc_id %d client_id %s\n",
2197 fid->fid, flock->type, flock->flags, flock->start,
2198 flock->length, flock->proc_id, flock->client_id);
2199
2200 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2201 flock->flags, flock->start, flock->length,
2202 flock->proc_id, flock->client_id);
2203
2204 if (IS_ERR(req))
2205 return PTR_ERR(req);
2206
2207 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2208 if (err) {
2209 trace_9p_protocol_dump(clnt, req->rc);
2210 goto error;
2211 }
2212 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2213 error:
2214 p9_free_req(clnt, req);
2215 return err;
2216
2217 }
2218 EXPORT_SYMBOL(p9_client_lock_dotl);
2219
2220 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2221 {
2222 int err;
2223 struct p9_client *clnt;
2224 struct p9_req_t *req;
2225
2226 err = 0;
2227 clnt = fid->clnt;
2228 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2229 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2230 glock->start, glock->length, glock->proc_id, glock->client_id);
2231
2232 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2233 glock->start, glock->length, glock->proc_id, glock->client_id);
2234
2235 if (IS_ERR(req))
2236 return PTR_ERR(req);
2237
2238 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2239 &glock->start, &glock->length, &glock->proc_id,
2240 &glock->client_id);
2241 if (err) {
2242 trace_9p_protocol_dump(clnt, req->rc);
2243 goto error;
2244 }
2245 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2246 "proc_id %d client_id %s\n", glock->type, glock->start,
2247 glock->length, glock->proc_id, glock->client_id);
2248 error:
2249 p9_free_req(clnt, req);
2250 return err;
2251 }
2252 EXPORT_SYMBOL(p9_client_getlock_dotl);
2253
2254 int p9_client_readlink(struct p9_fid *fid, char **target)
2255 {
2256 int err;
2257 struct p9_client *clnt;
2258 struct p9_req_t *req;
2259
2260 err = 0;
2261 clnt = fid->clnt;
2262 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2263
2264 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2265 if (IS_ERR(req))
2266 return PTR_ERR(req);
2267
2268 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2269 if (err) {
2270 trace_9p_protocol_dump(clnt, req->rc);
2271 goto error;
2272 }
2273 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2274 error:
2275 p9_free_req(clnt, req);
2276 return err;
2277 }
2278 EXPORT_SYMBOL(p9_client_readlink);
Linux with added FPC-III support