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KEYS: add missing permission check for request_key() destination
[linux/fpc-iii.git] / net / 9p / client.c
blob1a39a660dd189fb6f866dbb48f38944d797533e6
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 if (err != -ERESTARTSYS)
854 goto reterr;
855 }
856 if (req->status == REQ_STATUS_ERROR) {
857 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
858 err = req->t_err;
859 }
860 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
861 p9_debug(P9_DEBUG_MUX, "flushing\n");
862 sigpending = 1;
863 clear_thread_flag(TIF_SIGPENDING);
864
865 if (c->trans_mod->cancel(c, req))
866 p9_client_flush(c, req);
867
868 /* if we received the response anyway, don't signal error */
869 if (req->status == REQ_STATUS_RCVD)
870 err = 0;
871 }
872 if (sigpending) {
873 spin_lock_irqsave(&current->sighand->siglock, flags);
874 recalc_sigpending();
875 spin_unlock_irqrestore(&current->sighand->siglock, flags);
876 }
877 if (err < 0)
878 goto reterr;
879
880 err = p9_check_zc_errors(c, req, uidata, in_hdrlen, kern_buf);
881 trace_9p_client_res(c, type, req->rc->tag, err);
882 if (!err)
883 return req;
884 reterr:
885 p9_free_req(c, req);
886 return ERR_PTR(safe_errno(err));
887 }
888
889 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
890 {
891 int ret;
892 struct p9_fid *fid;
893 unsigned long flags;
894
895 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
896 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
897 if (!fid)
898 return ERR_PTR(-ENOMEM);
899
900 ret = p9_idpool_get(clnt->fidpool);
901 if (ret < 0) {
902 ret = -ENOSPC;
903 goto error;
904 }
905 fid->fid = ret;
906
907 memset(&fid->qid, 0, sizeof(struct p9_qid));
908 fid->mode = -1;
909 fid->uid = current_fsuid();
910 fid->clnt = clnt;
911 fid->rdir = NULL;
912 spin_lock_irqsave(&clnt->lock, flags);
913 list_add(&fid->flist, &clnt->fidlist);
914 spin_unlock_irqrestore(&clnt->lock, flags);
915
916 return fid;
917
918 error:
919 kfree(fid);
920 return ERR_PTR(ret);
921 }
922
923 static void p9_fid_destroy(struct p9_fid *fid)
924 {
925 struct p9_client *clnt;
926 unsigned long flags;
927
928 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
929 clnt = fid->clnt;
930 p9_idpool_put(fid->fid, clnt->fidpool);
931 spin_lock_irqsave(&clnt->lock, flags);
932 list_del(&fid->flist);
933 spin_unlock_irqrestore(&clnt->lock, flags);
934 kfree(fid->rdir);
935 kfree(fid);
936 }
937
938 static int p9_client_version(struct p9_client *c)
939 {
940 int err = 0;
941 struct p9_req_t *req;
942 char *version;
943 int msize;
944
945 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
946 c->msize, c->proto_version);
947
948 switch (c->proto_version) {
949 case p9_proto_2000L:
950 req = p9_client_rpc(c, P9_TVERSION, "ds",
951 c->msize, "9P2000.L");
952 break;
953 case p9_proto_2000u:
954 req = p9_client_rpc(c, P9_TVERSION, "ds",
955 c->msize, "9P2000.u");
956 break;
957 case p9_proto_legacy:
958 req = p9_client_rpc(c, P9_TVERSION, "ds",
959 c->msize, "9P2000");
960 break;
961 default:
962 return -EINVAL;
963 break;
964 }
965
966 if (IS_ERR(req))
967 return PTR_ERR(req);
968
969 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
970 if (err) {
971 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
972 trace_9p_protocol_dump(c, req->rc);
973 goto error;
974 }
975
976 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
977 if (!strncmp(version, "9P2000.L", 8))
978 c->proto_version = p9_proto_2000L;
979 else if (!strncmp(version, "9P2000.u", 8))
980 c->proto_version = p9_proto_2000u;
981 else if (!strncmp(version, "9P2000", 6))
982 c->proto_version = p9_proto_legacy;
983 else {
984 err = -EREMOTEIO;
985 goto error;
986 }
987
988 if (msize < c->msize)
989 c->msize = msize;
990
991 error:
992 kfree(version);
993 p9_free_req(c, req);
994
995 return err;
996 }
997
998 struct p9_client *p9_client_create(const char *dev_name, char *options)
999 {
1000 int err;
1001 struct p9_client *clnt;
1002 char *client_id;
1003
1004 err = 0;
1005 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
1006 if (!clnt)
1007 return ERR_PTR(-ENOMEM);
1008
1009 clnt->trans_mod = NULL;
1010 clnt->trans = NULL;
1011
1012 client_id = utsname()->nodename;
1013 memcpy(clnt->name, client_id, strlen(client_id) + 1);
1014
1015 spin_lock_init(&clnt->lock);
1016 INIT_LIST_HEAD(&clnt->fidlist);
1017
1018 err = p9_tag_init(clnt);
1019 if (err < 0)
1020 goto free_client;
1021
1022 err = parse_opts(options, clnt);
1023 if (err < 0)
1024 goto destroy_tagpool;
1025
1026 if (!clnt->trans_mod)
1027 clnt->trans_mod = v9fs_get_default_trans();
1028
1029 if (clnt->trans_mod == NULL) {
1030 err = -EPROTONOSUPPORT;
1031 p9_debug(P9_DEBUG_ERROR,
1032 "No transport defined or default transport\n");
1033 goto destroy_tagpool;
1034 }
1035
1036 clnt->fidpool = p9_idpool_create();
1037 if (IS_ERR(clnt->fidpool)) {
1038 err = PTR_ERR(clnt->fidpool);
1039 goto put_trans;
1040 }
1041
1042 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1043 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1044
1045 err = clnt->trans_mod->create(clnt, dev_name, options);
1046 if (err)
1047 goto destroy_fidpool;
1048
1049 if (clnt->msize > clnt->trans_mod->maxsize)
1050 clnt->msize = clnt->trans_mod->maxsize;
1051
1052 err = p9_client_version(clnt);
1053 if (err)
1054 goto close_trans;
1055
1056 return clnt;
1057
1058 close_trans:
1059 clnt->trans_mod->close(clnt);
1060 destroy_fidpool:
1061 p9_idpool_destroy(clnt->fidpool);
1062 put_trans:
1063 v9fs_put_trans(clnt->trans_mod);
1064 destroy_tagpool:
1065 p9_idpool_destroy(clnt->tagpool);
1066 free_client:
1067 kfree(clnt);
1068 return ERR_PTR(err);
1069 }
1070 EXPORT_SYMBOL(p9_client_create);
1071
1072 void p9_client_destroy(struct p9_client *clnt)
1073 {
1074 struct p9_fid *fid, *fidptr;
1075
1076 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1077
1078 if (clnt->trans_mod)
1079 clnt->trans_mod->close(clnt);
1080
1081 v9fs_put_trans(clnt->trans_mod);
1082
1083 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
1084 pr_info("Found fid %d not clunked\n", fid->fid);
1085 p9_fid_destroy(fid);
1086 }
1087
1088 if (clnt->fidpool)
1089 p9_idpool_destroy(clnt->fidpool);
1090
1091 p9_tag_cleanup(clnt);
1092
1093 kfree(clnt);
1094 }
1095 EXPORT_SYMBOL(p9_client_destroy);
1096
1097 void p9_client_disconnect(struct p9_client *clnt)
1098 {
1099 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1100 clnt->status = Disconnected;
1101 }
1102 EXPORT_SYMBOL(p9_client_disconnect);
1103
1104 void p9_client_begin_disconnect(struct p9_client *clnt)
1105 {
1106 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1107 clnt->status = BeginDisconnect;
1108 }
1109 EXPORT_SYMBOL(p9_client_begin_disconnect);
1110
1111 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1112 char *uname, kuid_t n_uname, char *aname)
1113 {
1114 int err = 0;
1115 struct p9_req_t *req;
1116 struct p9_fid *fid;
1117 struct p9_qid qid;
1118
1119
1120 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1121 afid ? afid->fid : -1, uname, aname);
1122 fid = p9_fid_create(clnt);
1123 if (IS_ERR(fid)) {
1124 err = PTR_ERR(fid);
1125 fid = NULL;
1126 goto error;
1127 }
1128
1129 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1130 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1131 if (IS_ERR(req)) {
1132 err = PTR_ERR(req);
1133 goto error;
1134 }
1135
1136 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
1137 if (err) {
1138 trace_9p_protocol_dump(clnt, req->rc);
1139 p9_free_req(clnt, req);
1140 goto error;
1141 }
1142
1143 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1144 qid.type, (unsigned long long)qid.path, qid.version);
1145
1146 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1147
1148 p9_free_req(clnt, req);
1149 return fid;
1150
1151 error:
1152 if (fid)
1153 p9_fid_destroy(fid);
1154 return ERR_PTR(err);
1155 }
1156 EXPORT_SYMBOL(p9_client_attach);
1157
1158 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1159 char **wnames, int clone)
1160 {
1161 int err;
1162 struct p9_client *clnt;
1163 struct p9_fid *fid;
1164 struct p9_qid *wqids;
1165 struct p9_req_t *req;
1166 uint16_t nwqids, count;
1167
1168 err = 0;
1169 wqids = NULL;
1170 clnt = oldfid->clnt;
1171 if (clone) {
1172 fid = p9_fid_create(clnt);
1173 if (IS_ERR(fid)) {
1174 err = PTR_ERR(fid);
1175 fid = NULL;
1176 goto error;
1177 }
1178
1179 fid->uid = oldfid->uid;
1180 } else
1181 fid = oldfid;
1182
1183
1184 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1185 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1186
1187 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1188 nwname, wnames);
1189 if (IS_ERR(req)) {
1190 err = PTR_ERR(req);
1191 goto error;
1192 }
1193
1194 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1195 if (err) {
1196 trace_9p_protocol_dump(clnt, req->rc);
1197 p9_free_req(clnt, req);
1198 goto clunk_fid;
1199 }
1200 p9_free_req(clnt, req);
1201
1202 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1203
1204 if (nwqids != nwname) {
1205 err = -ENOENT;
1206 goto clunk_fid;
1207 }
1208
1209 for (count = 0; count < nwqids; count++)
1210 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1211 count, wqids[count].type,
1212 (unsigned long long)wqids[count].path,
1213 wqids[count].version);
1214
1215 if (nwname)
1216 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1217 else
1218 fid->qid = oldfid->qid;
1219
1220 kfree(wqids);
1221 return fid;
1222
1223 clunk_fid:
1224 kfree(wqids);
1225 p9_client_clunk(fid);
1226 fid = NULL;
1227
1228 error:
1229 if (fid && (fid != oldfid))
1230 p9_fid_destroy(fid);
1231
1232 return ERR_PTR(err);
1233 }
1234 EXPORT_SYMBOL(p9_client_walk);
1235
1236 int p9_client_open(struct p9_fid *fid, int mode)
1237 {
1238 int err;
1239 struct p9_client *clnt;
1240 struct p9_req_t *req;
1241 struct p9_qid qid;
1242 int iounit;
1243
1244 clnt = fid->clnt;
1245 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1246 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1247 err = 0;
1248
1249 if (fid->mode != -1)
1250 return -EINVAL;
1251
1252 if (p9_is_proto_dotl(clnt))
1253 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1254 else
1255 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1256 if (IS_ERR(req)) {
1257 err = PTR_ERR(req);
1258 goto error;
1259 }
1260
1261 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1262 if (err) {
1263 trace_9p_protocol_dump(clnt, req->rc);
1264 goto free_and_error;
1265 }
1266
1267 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1268 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1269 (unsigned long long)qid.path, qid.version, iounit);
1270
1271 fid->mode = mode;
1272 fid->iounit = iounit;
1273
1274 free_and_error:
1275 p9_free_req(clnt, req);
1276 error:
1277 return err;
1278 }
1279 EXPORT_SYMBOL(p9_client_open);
1280
1281 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1282 kgid_t gid, struct p9_qid *qid)
1283 {
1284 int err = 0;
1285 struct p9_client *clnt;
1286 struct p9_req_t *req;
1287 int iounit;
1288
1289 p9_debug(P9_DEBUG_9P,
1290 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1291 ofid->fid, name, flags, mode,
1292 from_kgid(&init_user_ns, gid));
1293 clnt = ofid->clnt;
1294
1295 if (ofid->mode != -1)
1296 return -EINVAL;
1297
1298 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1299 mode, gid);
1300 if (IS_ERR(req)) {
1301 err = PTR_ERR(req);
1302 goto error;
1303 }
1304
1305 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1306 if (err) {
1307 trace_9p_protocol_dump(clnt, req->rc);
1308 goto free_and_error;
1309 }
1310
1311 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1312 qid->type,
1313 (unsigned long long)qid->path,
1314 qid->version, iounit);
1315
1316 ofid->mode = mode;
1317 ofid->iounit = iounit;
1318
1319 free_and_error:
1320 p9_free_req(clnt, req);
1321 error:
1322 return err;
1323 }
1324 EXPORT_SYMBOL(p9_client_create_dotl);
1325
1326 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1327 char *extension)
1328 {
1329 int err;
1330 struct p9_client *clnt;
1331 struct p9_req_t *req;
1332 struct p9_qid qid;
1333 int iounit;
1334
1335 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1336 fid->fid, name, perm, mode);
1337 err = 0;
1338 clnt = fid->clnt;
1339
1340 if (fid->mode != -1)
1341 return -EINVAL;
1342
1343 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1344 mode, extension);
1345 if (IS_ERR(req)) {
1346 err = PTR_ERR(req);
1347 goto error;
1348 }
1349
1350 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1351 if (err) {
1352 trace_9p_protocol_dump(clnt, req->rc);
1353 goto free_and_error;
1354 }
1355
1356 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1357 qid.type,
1358 (unsigned long long)qid.path,
1359 qid.version, iounit);
1360
1361 fid->mode = mode;
1362 fid->iounit = iounit;
1363
1364 free_and_error:
1365 p9_free_req(clnt, req);
1366 error:
1367 return err;
1368 }
1369 EXPORT_SYMBOL(p9_client_fcreate);
1370
1371 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, kgid_t gid,
1372 struct p9_qid *qid)
1373 {
1374 int err = 0;
1375 struct p9_client *clnt;
1376 struct p9_req_t *req;
1377
1378 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1379 dfid->fid, name, symtgt);
1380 clnt = dfid->clnt;
1381
1382 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1383 gid);
1384 if (IS_ERR(req)) {
1385 err = PTR_ERR(req);
1386 goto error;
1387 }
1388
1389 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1390 if (err) {
1391 trace_9p_protocol_dump(clnt, req->rc);
1392 goto free_and_error;
1393 }
1394
1395 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1396 qid->type, (unsigned long long)qid->path, qid->version);
1397
1398 free_and_error:
1399 p9_free_req(clnt, req);
1400 error:
1401 return err;
1402 }
1403 EXPORT_SYMBOL(p9_client_symlink);
1404
1405 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1406 {
1407 struct p9_client *clnt;
1408 struct p9_req_t *req;
1409
1410 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1411 dfid->fid, oldfid->fid, newname);
1412 clnt = dfid->clnt;
1413 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1414 newname);
1415 if (IS_ERR(req))
1416 return PTR_ERR(req);
1417
1418 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1419 p9_free_req(clnt, req);
1420 return 0;
1421 }
1422 EXPORT_SYMBOL(p9_client_link);
1423
1424 int p9_client_fsync(struct p9_fid *fid, int datasync)
1425 {
1426 int err;
1427 struct p9_client *clnt;
1428 struct p9_req_t *req;
1429
1430 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1431 fid->fid, datasync);
1432 err = 0;
1433 clnt = fid->clnt;
1434
1435 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1436 if (IS_ERR(req)) {
1437 err = PTR_ERR(req);
1438 goto error;
1439 }
1440
1441 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1442
1443 p9_free_req(clnt, req);
1444
1445 error:
1446 return err;
1447 }
1448 EXPORT_SYMBOL(p9_client_fsync);
1449
1450 int p9_client_clunk(struct p9_fid *fid)
1451 {
1452 int err;
1453 struct p9_client *clnt;
1454 struct p9_req_t *req;
1455 int retries = 0;
1456
1457 if (!fid) {
1458 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1459 __func__, task_pid_nr(current));
1460 dump_stack();
1461 return 0;
1462 }
1463
1464 again:
1465 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1466 retries);
1467 err = 0;
1468 clnt = fid->clnt;
1469
1470 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1471 if (IS_ERR(req)) {
1472 err = PTR_ERR(req);
1473 goto error;
1474 }
1475
1476 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1477
1478 p9_free_req(clnt, req);
1479 error:
1480 /*
1481 * Fid is not valid even after a failed clunk
1482 * If interrupted, retry once then give up and
1483 * leak fid until umount.
1484 */
1485 if (err == -ERESTARTSYS) {
1486 if (retries++ == 0)
1487 goto again;
1488 } else
1489 p9_fid_destroy(fid);
1490 return err;
1491 }
1492 EXPORT_SYMBOL(p9_client_clunk);
1493
1494 int p9_client_remove(struct p9_fid *fid)
1495 {
1496 int err;
1497 struct p9_client *clnt;
1498 struct p9_req_t *req;
1499
1500 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1501 err = 0;
1502 clnt = fid->clnt;
1503
1504 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1505 if (IS_ERR(req)) {
1506 err = PTR_ERR(req);
1507 goto error;
1508 }
1509
1510 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1511
1512 p9_free_req(clnt, req);
1513 error:
1514 if (err == -ERESTARTSYS)
1515 p9_client_clunk(fid);
1516 else
1517 p9_fid_destroy(fid);
1518 return err;
1519 }
1520 EXPORT_SYMBOL(p9_client_remove);
1521
1522 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1523 {
1524 int err = 0;
1525 struct p9_req_t *req;
1526 struct p9_client *clnt;
1527
1528 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1529 dfid->fid, name, flags);
1530
1531 clnt = dfid->clnt;
1532 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1533 if (IS_ERR(req)) {
1534 err = PTR_ERR(req);
1535 goto error;
1536 }
1537 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1538
1539 p9_free_req(clnt, req);
1540 error:
1541 return err;
1542 }
1543 EXPORT_SYMBOL(p9_client_unlinkat);
1544
1545 int
1546 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1547 u32 count)
1548 {
1549 char *dataptr;
1550 int kernel_buf = 0;
1551 struct p9_req_t *req;
1552 struct p9_client *clnt;
1553 int err, rsize, non_zc = 0;
1554
1555
1556 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1557 fid->fid, (unsigned long long) offset, count);
1558 err = 0;
1559 clnt = fid->clnt;
1560
1561 rsize = fid->iounit;
1562 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1563 rsize = clnt->msize - P9_IOHDRSZ;
1564
1565 if (count < rsize)
1566 rsize = count;
1567
1568 /* Don't bother zerocopy for small IO (< 1024) */
1569 if (clnt->trans_mod->zc_request && rsize > 1024) {
1570 char *indata;
1571 if (data) {
1572 kernel_buf = 1;
1573 indata = data;
1574 } else
1575 indata = (__force char *)udata;
1576 /*
1577 * response header len is 11
1578 * PDU Header(7) + IO Size (4)
1579 */
1580 req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0,
1581 11, kernel_buf, "dqd", fid->fid,
1582 offset, rsize);
1583 } else {
1584 non_zc = 1;
1585 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1586 rsize);
1587 }
1588 if (IS_ERR(req)) {
1589 err = PTR_ERR(req);
1590 goto error;
1591 }
1592
1593 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1594 if (err) {
1595 trace_9p_protocol_dump(clnt, req->rc);
1596 goto free_and_error;
1597 }
1598
1599 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1600
1601 if (non_zc) {
1602 if (data) {
1603 memmove(data, dataptr, count);
1604 } else {
1605 err = copy_to_user(udata, dataptr, count);
1606 if (err) {
1607 err = -EFAULT;
1608 goto free_and_error;
1609 }
1610 }
1611 }
1612 p9_free_req(clnt, req);
1613 return count;
1614
1615 free_and_error:
1616 p9_free_req(clnt, req);
1617 error:
1618 return err;
1619 }
1620 EXPORT_SYMBOL(p9_client_read);
1621
1622 int
1623 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1624 u64 offset, u32 count)
1625 {
1626 int err, rsize;
1627 int kernel_buf = 0;
1628 struct p9_client *clnt;
1629 struct p9_req_t *req;
1630
1631 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1632 fid->fid, (unsigned long long) offset, count);
1633 err = 0;
1634 clnt = fid->clnt;
1635
1636 rsize = fid->iounit;
1637 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1638 rsize = clnt->msize - P9_IOHDRSZ;
1639
1640 if (count < rsize)
1641 rsize = count;
1642
1643 /* Don't bother zerocopy for small IO (< 1024) */
1644 if (clnt->trans_mod->zc_request && rsize > 1024) {
1645 char *odata;
1646 if (data) {
1647 kernel_buf = 1;
1648 odata = data;
1649 } else
1650 odata = (char *)udata;
1651 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize,
1652 P9_ZC_HDR_SZ, kernel_buf, "dqd",
1653 fid->fid, offset, rsize);
1654 } else {
1655 if (data)
1656 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
1657 offset, rsize, data);
1658 else
1659 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
1660 offset, rsize, udata);
1661 }
1662 if (IS_ERR(req)) {
1663 err = PTR_ERR(req);
1664 goto error;
1665 }
1666
1667 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1668 if (err) {
1669 trace_9p_protocol_dump(clnt, req->rc);
1670 goto free_and_error;
1671 }
1672
1673 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1674
1675 p9_free_req(clnt, req);
1676 return count;
1677
1678 free_and_error:
1679 p9_free_req(clnt, req);
1680 error:
1681 return err;
1682 }
1683 EXPORT_SYMBOL(p9_client_write);
1684
1685 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1686 {
1687 int err;
1688 struct p9_client *clnt;
1689 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1690 struct p9_req_t *req;
1691 u16 ignored;
1692
1693 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1694
1695 if (!ret)
1696 return ERR_PTR(-ENOMEM);
1697
1698 err = 0;
1699 clnt = fid->clnt;
1700
1701 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1702 if (IS_ERR(req)) {
1703 err = PTR_ERR(req);
1704 goto error;
1705 }
1706
1707 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1708 if (err) {
1709 trace_9p_protocol_dump(clnt, req->rc);
1710 p9_free_req(clnt, req);
1711 goto error;
1712 }
1713
1714 p9_debug(P9_DEBUG_9P,
1715 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1716 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1717 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1718 "<<< uid=%d gid=%d n_muid=%d\n",
1719 ret->size, ret->type, ret->dev, ret->qid.type,
1720 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1721 ret->atime, ret->mtime, (unsigned long long)ret->length,
1722 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1723 from_kuid(&init_user_ns, ret->n_uid),
1724 from_kgid(&init_user_ns, ret->n_gid),
1725 from_kuid(&init_user_ns, ret->n_muid));
1726
1727 p9_free_req(clnt, req);
1728 return ret;
1729
1730 error:
1731 kfree(ret);
1732 return ERR_PTR(err);
1733 }
1734 EXPORT_SYMBOL(p9_client_stat);
1735
1736 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1737 u64 request_mask)
1738 {
1739 int err;
1740 struct p9_client *clnt;
1741 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1742 GFP_KERNEL);
1743 struct p9_req_t *req;
1744
1745 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1746 fid->fid, request_mask);
1747
1748 if (!ret)
1749 return ERR_PTR(-ENOMEM);
1750
1751 err = 0;
1752 clnt = fid->clnt;
1753
1754 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1755 if (IS_ERR(req)) {
1756 err = PTR_ERR(req);
1757 goto error;
1758 }
1759
1760 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1761 if (err) {
1762 trace_9p_protocol_dump(clnt, req->rc);
1763 p9_free_req(clnt, req);
1764 goto error;
1765 }
1766
1767 p9_debug(P9_DEBUG_9P,
1768 "<<< RGETATTR st_result_mask=%lld\n"
1769 "<<< qid=%x.%llx.%x\n"
1770 "<<< st_mode=%8.8x st_nlink=%llu\n"
1771 "<<< st_uid=%d st_gid=%d\n"
1772 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1773 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1774 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1775 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1776 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1777 "<<< st_gen=%lld st_data_version=%lld",
1778 ret->st_result_mask, ret->qid.type, ret->qid.path,
1779 ret->qid.version, ret->st_mode, ret->st_nlink,
1780 from_kuid(&init_user_ns, ret->st_uid),
1781 from_kgid(&init_user_ns, ret->st_gid),
1782 ret->st_rdev, ret->st_size, ret->st_blksize,
1783 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1784 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1785 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1786 ret->st_gen, ret->st_data_version);
1787
1788 p9_free_req(clnt, req);
1789 return ret;
1790
1791 error:
1792 kfree(ret);
1793 return ERR_PTR(err);
1794 }
1795 EXPORT_SYMBOL(p9_client_getattr_dotl);
1796
1797 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1798 {
1799 int ret;
1800
1801 /* NOTE: size shouldn't include its own length */
1802 /* size[2] type[2] dev[4] qid[13] */
1803 /* mode[4] atime[4] mtime[4] length[8]*/
1804 /* name[s] uid[s] gid[s] muid[s] */
1805 ret = 2+4+13+4+4+4+8+2+2+2+2;
1806
1807 if (wst->name)
1808 ret += strlen(wst->name);
1809 if (wst->uid)
1810 ret += strlen(wst->uid);
1811 if (wst->gid)
1812 ret += strlen(wst->gid);
1813 if (wst->muid)
1814 ret += strlen(wst->muid);
1815
1816 if ((proto_version == p9_proto_2000u) ||
1817 (proto_version == p9_proto_2000L)) {
1818 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1819 if (wst->extension)
1820 ret += strlen(wst->extension);
1821 }
1822
1823 return ret;
1824 }
1825
1826 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1827 {
1828 int err;
1829 struct p9_req_t *req;
1830 struct p9_client *clnt;
1831
1832 err = 0;
1833 clnt = fid->clnt;
1834 wst->size = p9_client_statsize(wst, clnt->proto_version);
1835 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1836 p9_debug(P9_DEBUG_9P,
1837 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1838 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1839 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1840 " uid=%d gid=%d n_muid=%d\n",
1841 wst->size, wst->type, wst->dev, wst->qid.type,
1842 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1843 wst->atime, wst->mtime, (unsigned long long)wst->length,
1844 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1845 from_kuid(&init_user_ns, wst->n_uid),
1846 from_kgid(&init_user_ns, wst->n_gid),
1847 from_kuid(&init_user_ns, wst->n_muid));
1848
1849 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1850 if (IS_ERR(req)) {
1851 err = PTR_ERR(req);
1852 goto error;
1853 }
1854
1855 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1856
1857 p9_free_req(clnt, req);
1858 error:
1859 return err;
1860 }
1861 EXPORT_SYMBOL(p9_client_wstat);
1862
1863 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1864 {
1865 int err;
1866 struct p9_req_t *req;
1867 struct p9_client *clnt;
1868
1869 err = 0;
1870 clnt = fid->clnt;
1871 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1872 p9_debug(P9_DEBUG_9P,
1873 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1874 " atime_sec=%lld atime_nsec=%lld\n"
1875 " mtime_sec=%lld mtime_nsec=%lld\n",
1876 p9attr->valid, p9attr->mode,
1877 from_kuid(&init_user_ns, p9attr->uid),
1878 from_kgid(&init_user_ns, p9attr->gid),
1879 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1880 p9attr->mtime_sec, p9attr->mtime_nsec);
1881
1882 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1883
1884 if (IS_ERR(req)) {
1885 err = PTR_ERR(req);
1886 goto error;
1887 }
1888 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1889 p9_free_req(clnt, req);
1890 error:
1891 return err;
1892 }
1893 EXPORT_SYMBOL(p9_client_setattr);
1894
1895 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1896 {
1897 int err;
1898 struct p9_req_t *req;
1899 struct p9_client *clnt;
1900
1901 err = 0;
1902 clnt = fid->clnt;
1903
1904 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1905
1906 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1907 if (IS_ERR(req)) {
1908 err = PTR_ERR(req);
1909 goto error;
1910 }
1911
1912 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1913 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1914 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1915 if (err) {
1916 trace_9p_protocol_dump(clnt, req->rc);
1917 p9_free_req(clnt, req);
1918 goto error;
1919 }
1920
1921 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1922 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1923 "fsid %llu namelen %ld\n",
1924 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1925 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1926 sb->fsid, (long int)sb->namelen);
1927
1928 p9_free_req(clnt, req);
1929 error:
1930 return err;
1931 }
1932 EXPORT_SYMBOL(p9_client_statfs);
1933
1934 int p9_client_rename(struct p9_fid *fid,
1935 struct p9_fid *newdirfid, const char *name)
1936 {
1937 int err;
1938 struct p9_req_t *req;
1939 struct p9_client *clnt;
1940
1941 err = 0;
1942 clnt = fid->clnt;
1943
1944 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1945 fid->fid, newdirfid->fid, name);
1946
1947 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1948 newdirfid->fid, name);
1949 if (IS_ERR(req)) {
1950 err = PTR_ERR(req);
1951 goto error;
1952 }
1953
1954 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1955
1956 p9_free_req(clnt, req);
1957 error:
1958 return err;
1959 }
1960 EXPORT_SYMBOL(p9_client_rename);
1961
1962 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1963 struct p9_fid *newdirfid, const char *new_name)
1964 {
1965 int err;
1966 struct p9_req_t *req;
1967 struct p9_client *clnt;
1968
1969 err = 0;
1970 clnt = olddirfid->clnt;
1971
1972 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1973 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1974 newdirfid->fid, new_name);
1975
1976 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1977 old_name, newdirfid->fid, new_name);
1978 if (IS_ERR(req)) {
1979 err = PTR_ERR(req);
1980 goto error;
1981 }
1982
1983 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1984 newdirfid->fid, new_name);
1985
1986 p9_free_req(clnt, req);
1987 error:
1988 return err;
1989 }
1990 EXPORT_SYMBOL(p9_client_renameat);
1991
1992 /*
1993 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1994 */
1995 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1996 const char *attr_name, u64 *attr_size)
1997 {
1998 int err;
1999 struct p9_req_t *req;
2000 struct p9_client *clnt;
2001 struct p9_fid *attr_fid;
2002
2003 err = 0;
2004 clnt = file_fid->clnt;
2005 attr_fid = p9_fid_create(clnt);
2006 if (IS_ERR(attr_fid)) {
2007 err = PTR_ERR(attr_fid);
2008 attr_fid = NULL;
2009 goto error;
2010 }
2011 p9_debug(P9_DEBUG_9P,
2012 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
2013 file_fid->fid, attr_fid->fid, attr_name);
2014
2015 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
2016 file_fid->fid, attr_fid->fid, attr_name);
2017 if (IS_ERR(req)) {
2018 err = PTR_ERR(req);
2019 goto error;
2020 }
2021 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
2022 if (err) {
2023 trace_9p_protocol_dump(clnt, req->rc);
2024 p9_free_req(clnt, req);
2025 goto clunk_fid;
2026 }
2027 p9_free_req(clnt, req);
2028 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2029 attr_fid->fid, *attr_size);
2030 return attr_fid;
2031 clunk_fid:
2032 p9_client_clunk(attr_fid);
2033 attr_fid = NULL;
2034 error:
2035 if (attr_fid && (attr_fid != file_fid))
2036 p9_fid_destroy(attr_fid);
2037
2038 return ERR_PTR(err);
2039 }
2040 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2041
2042 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2043 u64 attr_size, int flags)
2044 {
2045 int err;
2046 struct p9_req_t *req;
2047 struct p9_client *clnt;
2048
2049 p9_debug(P9_DEBUG_9P,
2050 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2051 fid->fid, name, (long long)attr_size, flags);
2052 err = 0;
2053 clnt = fid->clnt;
2054 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2055 fid->fid, name, attr_size, flags);
2056 if (IS_ERR(req)) {
2057 err = PTR_ERR(req);
2058 goto error;
2059 }
2060 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2061 p9_free_req(clnt, req);
2062 error:
2063 return err;
2064 }
2065 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2066
2067 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2068 {
2069 int err, rsize, non_zc = 0;
2070 struct p9_client *clnt;
2071 struct p9_req_t *req;
2072 char *dataptr;
2073
2074 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2075 fid->fid, (unsigned long long) offset, count);
2076
2077 err = 0;
2078 clnt = fid->clnt;
2079
2080 rsize = fid->iounit;
2081 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2082 rsize = clnt->msize - P9_READDIRHDRSZ;
2083
2084 if (count < rsize)
2085 rsize = count;
2086
2087 /* Don't bother zerocopy for small IO (< 1024) */
2088 if (clnt->trans_mod->zc_request && rsize > 1024) {
2089 /*
2090 * response header len is 11
2091 * PDU Header(7) + IO Size (4)
2092 */
2093 req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0,
2094 11, 1, "dqd", fid->fid, offset, rsize);
2095 } else {
2096 non_zc = 1;
2097 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2098 offset, rsize);
2099 }
2100 if (IS_ERR(req)) {
2101 err = PTR_ERR(req);
2102 goto error;
2103 }
2104
2105 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2106 if (err) {
2107 trace_9p_protocol_dump(clnt, req->rc);
2108 goto free_and_error;
2109 }
2110 if (rsize < count) {
2111 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize);
2112 count = rsize;
2113 }
2114
2115 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2116
2117 if (non_zc)
2118 memmove(data, dataptr, count);
2119
2120 p9_free_req(clnt, req);
2121 return count;
2122
2123 free_and_error:
2124 p9_free_req(clnt, req);
2125 error:
2126 return err;
2127 }
2128 EXPORT_SYMBOL(p9_client_readdir);
2129
2130 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
2131 dev_t rdev, kgid_t gid, struct p9_qid *qid)
2132 {
2133 int err;
2134 struct p9_client *clnt;
2135 struct p9_req_t *req;
2136
2137 err = 0;
2138 clnt = fid->clnt;
2139 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2140 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2141 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2142 MAJOR(rdev), MINOR(rdev), gid);
2143 if (IS_ERR(req))
2144 return PTR_ERR(req);
2145
2146 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2147 if (err) {
2148 trace_9p_protocol_dump(clnt, req->rc);
2149 goto error;
2150 }
2151 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2152 (unsigned long long)qid->path, qid->version);
2153
2154 error:
2155 p9_free_req(clnt, req);
2156 return err;
2157
2158 }
2159 EXPORT_SYMBOL(p9_client_mknod_dotl);
2160
2161 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
2162 kgid_t gid, struct p9_qid *qid)
2163 {
2164 int err;
2165 struct p9_client *clnt;
2166 struct p9_req_t *req;
2167
2168 err = 0;
2169 clnt = fid->clnt;
2170 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2171 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2172 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
2173 gid);
2174 if (IS_ERR(req))
2175 return PTR_ERR(req);
2176
2177 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2178 if (err) {
2179 trace_9p_protocol_dump(clnt, req->rc);
2180 goto error;
2181 }
2182 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2183 (unsigned long long)qid->path, qid->version);
2184
2185 error:
2186 p9_free_req(clnt, req);
2187 return err;
2188
2189 }
2190 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2191
2192 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2193 {
2194 int err;
2195 struct p9_client *clnt;
2196 struct p9_req_t *req;
2197
2198 err = 0;
2199 clnt = fid->clnt;
2200 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2201 "start %lld length %lld proc_id %d client_id %s\n",
2202 fid->fid, flock->type, flock->flags, flock->start,
2203 flock->length, flock->proc_id, flock->client_id);
2204
2205 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2206 flock->flags, flock->start, flock->length,
2207 flock->proc_id, flock->client_id);
2208
2209 if (IS_ERR(req))
2210 return PTR_ERR(req);
2211
2212 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2213 if (err) {
2214 trace_9p_protocol_dump(clnt, req->rc);
2215 goto error;
2216 }
2217 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2218 error:
2219 p9_free_req(clnt, req);
2220 return err;
2221
2222 }
2223 EXPORT_SYMBOL(p9_client_lock_dotl);
2224
2225 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2226 {
2227 int err;
2228 struct p9_client *clnt;
2229 struct p9_req_t *req;
2230
2231 err = 0;
2232 clnt = fid->clnt;
2233 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2234 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2235 glock->start, glock->length, glock->proc_id, glock->client_id);
2236
2237 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2238 glock->start, glock->length, glock->proc_id, glock->client_id);
2239
2240 if (IS_ERR(req))
2241 return PTR_ERR(req);
2242
2243 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2244 &glock->start, &glock->length, &glock->proc_id,
2245 &glock->client_id);
2246 if (err) {
2247 trace_9p_protocol_dump(clnt, req->rc);
2248 goto error;
2249 }
2250 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2251 "proc_id %d client_id %s\n", glock->type, glock->start,
2252 glock->length, glock->proc_id, glock->client_id);
2253 error:
2254 p9_free_req(clnt, req);
2255 return err;
2256 }
2257 EXPORT_SYMBOL(p9_client_getlock_dotl);
2258
2259 int p9_client_readlink(struct p9_fid *fid, char **target)
2260 {
2261 int err;
2262 struct p9_client *clnt;
2263 struct p9_req_t *req;
2264
2265 err = 0;
2266 clnt = fid->clnt;
2267 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2268
2269 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2270 if (IS_ERR(req))
2271 return PTR_ERR(req);
2272
2273 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2274 if (err) {
2275 trace_9p_protocol_dump(clnt, req->rc);
2276 goto error;
2277 }
2278 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2279 error:
2280 p9_free_req(clnt, req);
2281 return err;
2282 }
2283 EXPORT_SYMBOL(p9_client_readlink);
Linux with added FPC-III support