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rds: Make rds_message_copy_from_user() return 0 on success.
[linux-2.6/btrfs-unstable.git] / net / 9p / client.c
blobe86a9bea1d160ccc1a739eee576d0bdbf0483956
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 }
963
964 if (IS_ERR(req))
965 return PTR_ERR(req);
966
967 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
968 if (err) {
969 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
970 trace_9p_protocol_dump(c, req->rc);
971 goto error;
972 }
973
974 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
975 if (!strncmp(version, "9P2000.L", 8))
976 c->proto_version = p9_proto_2000L;
977 else if (!strncmp(version, "9P2000.u", 8))
978 c->proto_version = p9_proto_2000u;
979 else if (!strncmp(version, "9P2000", 6))
980 c->proto_version = p9_proto_legacy;
981 else {
982 err = -EREMOTEIO;
983 goto error;
984 }
985
986 if (msize < c->msize)
987 c->msize = msize;
988
989 error:
990 kfree(version);
991 p9_free_req(c, req);
992
993 return err;
994 }
995
996 struct p9_client *p9_client_create(const char *dev_name, char *options)
997 {
998 int err;
999 struct p9_client *clnt;
1000 char *client_id;
1001
1002 err = 0;
1003 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
1004 if (!clnt)
1005 return ERR_PTR(-ENOMEM);
1006
1007 clnt->trans_mod = NULL;
1008 clnt->trans = NULL;
1009
1010 client_id = utsname()->nodename;
1011 memcpy(clnt->name, client_id, strlen(client_id) + 1);
1012
1013 spin_lock_init(&clnt->lock);
1014 INIT_LIST_HEAD(&clnt->fidlist);
1015
1016 err = p9_tag_init(clnt);
1017 if (err < 0)
1018 goto free_client;
1019
1020 err = parse_opts(options, clnt);
1021 if (err < 0)
1022 goto destroy_tagpool;
1023
1024 if (!clnt->trans_mod)
1025 clnt->trans_mod = v9fs_get_default_trans();
1026
1027 if (clnt->trans_mod == NULL) {
1028 err = -EPROTONOSUPPORT;
1029 p9_debug(P9_DEBUG_ERROR,
1030 "No transport defined or default transport\n");
1031 goto destroy_tagpool;
1032 }
1033
1034 clnt->fidpool = p9_idpool_create();
1035 if (IS_ERR(clnt->fidpool)) {
1036 err = PTR_ERR(clnt->fidpool);
1037 goto put_trans;
1038 }
1039
1040 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1041 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1042
1043 err = clnt->trans_mod->create(clnt, dev_name, options);
1044 if (err)
1045 goto destroy_fidpool;
1046
1047 if (clnt->msize > clnt->trans_mod->maxsize)
1048 clnt->msize = clnt->trans_mod->maxsize;
1049
1050 err = p9_client_version(clnt);
1051 if (err)
1052 goto close_trans;
1053
1054 return clnt;
1055
1056 close_trans:
1057 clnt->trans_mod->close(clnt);
1058 destroy_fidpool:
1059 p9_idpool_destroy(clnt->fidpool);
1060 put_trans:
1061 v9fs_put_trans(clnt->trans_mod);
1062 destroy_tagpool:
1063 p9_idpool_destroy(clnt->tagpool);
1064 free_client:
1065 kfree(clnt);
1066 return ERR_PTR(err);
1067 }
1068 EXPORT_SYMBOL(p9_client_create);
1069
1070 void p9_client_destroy(struct p9_client *clnt)
1071 {
1072 struct p9_fid *fid, *fidptr;
1073
1074 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1075
1076 if (clnt->trans_mod)
1077 clnt->trans_mod->close(clnt);
1078
1079 v9fs_put_trans(clnt->trans_mod);
1080
1081 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
1082 pr_info("Found fid %d not clunked\n", fid->fid);
1083 p9_fid_destroy(fid);
1084 }
1085
1086 if (clnt->fidpool)
1087 p9_idpool_destroy(clnt->fidpool);
1088
1089 p9_tag_cleanup(clnt);
1090
1091 kfree(clnt);
1092 }
1093 EXPORT_SYMBOL(p9_client_destroy);
1094
1095 void p9_client_disconnect(struct p9_client *clnt)
1096 {
1097 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1098 clnt->status = Disconnected;
1099 }
1100 EXPORT_SYMBOL(p9_client_disconnect);
1101
1102 void p9_client_begin_disconnect(struct p9_client *clnt)
1103 {
1104 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1105 clnt->status = BeginDisconnect;
1106 }
1107 EXPORT_SYMBOL(p9_client_begin_disconnect);
1108
1109 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1110 char *uname, kuid_t n_uname, char *aname)
1111 {
1112 int err = 0;
1113 struct p9_req_t *req;
1114 struct p9_fid *fid;
1115 struct p9_qid qid;
1116
1117
1118 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1119 afid ? afid->fid : -1, uname, aname);
1120 fid = p9_fid_create(clnt);
1121 if (IS_ERR(fid)) {
1122 err = PTR_ERR(fid);
1123 fid = NULL;
1124 goto error;
1125 }
1126
1127 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1128 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1129 if (IS_ERR(req)) {
1130 err = PTR_ERR(req);
1131 goto error;
1132 }
1133
1134 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
1135 if (err) {
1136 trace_9p_protocol_dump(clnt, req->rc);
1137 p9_free_req(clnt, req);
1138 goto error;
1139 }
1140
1141 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1142 qid.type, (unsigned long long)qid.path, qid.version);
1143
1144 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1145
1146 p9_free_req(clnt, req);
1147 return fid;
1148
1149 error:
1150 if (fid)
1151 p9_fid_destroy(fid);
1152 return ERR_PTR(err);
1153 }
1154 EXPORT_SYMBOL(p9_client_attach);
1155
1156 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1157 char **wnames, int clone)
1158 {
1159 int err;
1160 struct p9_client *clnt;
1161 struct p9_fid *fid;
1162 struct p9_qid *wqids;
1163 struct p9_req_t *req;
1164 uint16_t nwqids, count;
1165
1166 err = 0;
1167 wqids = NULL;
1168 clnt = oldfid->clnt;
1169 if (clone) {
1170 fid = p9_fid_create(clnt);
1171 if (IS_ERR(fid)) {
1172 err = PTR_ERR(fid);
1173 fid = NULL;
1174 goto error;
1175 }
1176
1177 fid->uid = oldfid->uid;
1178 } else
1179 fid = oldfid;
1180
1181
1182 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1183 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1184
1185 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1186 nwname, wnames);
1187 if (IS_ERR(req)) {
1188 err = PTR_ERR(req);
1189 goto error;
1190 }
1191
1192 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1193 if (err) {
1194 trace_9p_protocol_dump(clnt, req->rc);
1195 p9_free_req(clnt, req);
1196 goto clunk_fid;
1197 }
1198 p9_free_req(clnt, req);
1199
1200 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1201
1202 if (nwqids != nwname) {
1203 err = -ENOENT;
1204 goto clunk_fid;
1205 }
1206
1207 for (count = 0; count < nwqids; count++)
1208 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1209 count, wqids[count].type,
1210 (unsigned long long)wqids[count].path,
1211 wqids[count].version);
1212
1213 if (nwname)
1214 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1215 else
1216 fid->qid = oldfid->qid;
1217
1218 kfree(wqids);
1219 return fid;
1220
1221 clunk_fid:
1222 kfree(wqids);
1223 p9_client_clunk(fid);
1224 fid = NULL;
1225
1226 error:
1227 if (fid && (fid != oldfid))
1228 p9_fid_destroy(fid);
1229
1230 return ERR_PTR(err);
1231 }
1232 EXPORT_SYMBOL(p9_client_walk);
1233
1234 int p9_client_open(struct p9_fid *fid, int mode)
1235 {
1236 int err;
1237 struct p9_client *clnt;
1238 struct p9_req_t *req;
1239 struct p9_qid qid;
1240 int iounit;
1241
1242 clnt = fid->clnt;
1243 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1244 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1245 err = 0;
1246
1247 if (fid->mode != -1)
1248 return -EINVAL;
1249
1250 if (p9_is_proto_dotl(clnt))
1251 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1252 else
1253 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1254 if (IS_ERR(req)) {
1255 err = PTR_ERR(req);
1256 goto error;
1257 }
1258
1259 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1260 if (err) {
1261 trace_9p_protocol_dump(clnt, req->rc);
1262 goto free_and_error;
1263 }
1264
1265 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1266 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1267 (unsigned long long)qid.path, qid.version, iounit);
1268
1269 fid->mode = mode;
1270 fid->iounit = iounit;
1271
1272 free_and_error:
1273 p9_free_req(clnt, req);
1274 error:
1275 return err;
1276 }
1277 EXPORT_SYMBOL(p9_client_open);
1278
1279 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1280 kgid_t gid, struct p9_qid *qid)
1281 {
1282 int err = 0;
1283 struct p9_client *clnt;
1284 struct p9_req_t *req;
1285 int iounit;
1286
1287 p9_debug(P9_DEBUG_9P,
1288 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1289 ofid->fid, name, flags, mode,
1290 from_kgid(&init_user_ns, gid));
1291 clnt = ofid->clnt;
1292
1293 if (ofid->mode != -1)
1294 return -EINVAL;
1295
1296 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1297 mode, gid);
1298 if (IS_ERR(req)) {
1299 err = PTR_ERR(req);
1300 goto error;
1301 }
1302
1303 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1304 if (err) {
1305 trace_9p_protocol_dump(clnt, req->rc);
1306 goto free_and_error;
1307 }
1308
1309 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1310 qid->type,
1311 (unsigned long long)qid->path,
1312 qid->version, iounit);
1313
1314 ofid->mode = mode;
1315 ofid->iounit = iounit;
1316
1317 free_and_error:
1318 p9_free_req(clnt, req);
1319 error:
1320 return err;
1321 }
1322 EXPORT_SYMBOL(p9_client_create_dotl);
1323
1324 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1325 char *extension)
1326 {
1327 int err;
1328 struct p9_client *clnt;
1329 struct p9_req_t *req;
1330 struct p9_qid qid;
1331 int iounit;
1332
1333 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1334 fid->fid, name, perm, mode);
1335 err = 0;
1336 clnt = fid->clnt;
1337
1338 if (fid->mode != -1)
1339 return -EINVAL;
1340
1341 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1342 mode, extension);
1343 if (IS_ERR(req)) {
1344 err = PTR_ERR(req);
1345 goto error;
1346 }
1347
1348 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1349 if (err) {
1350 trace_9p_protocol_dump(clnt, req->rc);
1351 goto free_and_error;
1352 }
1353
1354 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1355 qid.type,
1356 (unsigned long long)qid.path,
1357 qid.version, iounit);
1358
1359 fid->mode = mode;
1360 fid->iounit = iounit;
1361
1362 free_and_error:
1363 p9_free_req(clnt, req);
1364 error:
1365 return err;
1366 }
1367 EXPORT_SYMBOL(p9_client_fcreate);
1368
1369 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, kgid_t gid,
1370 struct p9_qid *qid)
1371 {
1372 int err = 0;
1373 struct p9_client *clnt;
1374 struct p9_req_t *req;
1375
1376 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1377 dfid->fid, name, symtgt);
1378 clnt = dfid->clnt;
1379
1380 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1381 gid);
1382 if (IS_ERR(req)) {
1383 err = PTR_ERR(req);
1384 goto error;
1385 }
1386
1387 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1388 if (err) {
1389 trace_9p_protocol_dump(clnt, req->rc);
1390 goto free_and_error;
1391 }
1392
1393 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1394 qid->type, (unsigned long long)qid->path, qid->version);
1395
1396 free_and_error:
1397 p9_free_req(clnt, req);
1398 error:
1399 return err;
1400 }
1401 EXPORT_SYMBOL(p9_client_symlink);
1402
1403 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1404 {
1405 struct p9_client *clnt;
1406 struct p9_req_t *req;
1407
1408 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1409 dfid->fid, oldfid->fid, newname);
1410 clnt = dfid->clnt;
1411 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1412 newname);
1413 if (IS_ERR(req))
1414 return PTR_ERR(req);
1415
1416 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1417 p9_free_req(clnt, req);
1418 return 0;
1419 }
1420 EXPORT_SYMBOL(p9_client_link);
1421
1422 int p9_client_fsync(struct p9_fid *fid, int datasync)
1423 {
1424 int err;
1425 struct p9_client *clnt;
1426 struct p9_req_t *req;
1427
1428 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1429 fid->fid, datasync);
1430 err = 0;
1431 clnt = fid->clnt;
1432
1433 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1434 if (IS_ERR(req)) {
1435 err = PTR_ERR(req);
1436 goto error;
1437 }
1438
1439 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1440
1441 p9_free_req(clnt, req);
1442
1443 error:
1444 return err;
1445 }
1446 EXPORT_SYMBOL(p9_client_fsync);
1447
1448 int p9_client_clunk(struct p9_fid *fid)
1449 {
1450 int err;
1451 struct p9_client *clnt;
1452 struct p9_req_t *req;
1453 int retries = 0;
1454
1455 if (!fid) {
1456 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1457 __func__, task_pid_nr(current));
1458 dump_stack();
1459 return 0;
1460 }
1461
1462 again:
1463 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1464 retries);
1465 err = 0;
1466 clnt = fid->clnt;
1467
1468 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1469 if (IS_ERR(req)) {
1470 err = PTR_ERR(req);
1471 goto error;
1472 }
1473
1474 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1475
1476 p9_free_req(clnt, req);
1477 error:
1478 /*
1479 * Fid is not valid even after a failed clunk
1480 * If interrupted, retry once then give up and
1481 * leak fid until umount.
1482 */
1483 if (err == -ERESTARTSYS) {
1484 if (retries++ == 0)
1485 goto again;
1486 } else
1487 p9_fid_destroy(fid);
1488 return err;
1489 }
1490 EXPORT_SYMBOL(p9_client_clunk);
1491
1492 int p9_client_remove(struct p9_fid *fid)
1493 {
1494 int err;
1495 struct p9_client *clnt;
1496 struct p9_req_t *req;
1497
1498 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1499 err = 0;
1500 clnt = fid->clnt;
1501
1502 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1503 if (IS_ERR(req)) {
1504 err = PTR_ERR(req);
1505 goto error;
1506 }
1507
1508 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1509
1510 p9_free_req(clnt, req);
1511 error:
1512 if (err == -ERESTARTSYS)
1513 p9_client_clunk(fid);
1514 else
1515 p9_fid_destroy(fid);
1516 return err;
1517 }
1518 EXPORT_SYMBOL(p9_client_remove);
1519
1520 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1521 {
1522 int err = 0;
1523 struct p9_req_t *req;
1524 struct p9_client *clnt;
1525
1526 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1527 dfid->fid, name, flags);
1528
1529 clnt = dfid->clnt;
1530 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1531 if (IS_ERR(req)) {
1532 err = PTR_ERR(req);
1533 goto error;
1534 }
1535 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1536
1537 p9_free_req(clnt, req);
1538 error:
1539 return err;
1540 }
1541 EXPORT_SYMBOL(p9_client_unlinkat);
1542
1543 int
1544 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1545 u32 count)
1546 {
1547 char *dataptr;
1548 int kernel_buf = 0;
1549 struct p9_req_t *req;
1550 struct p9_client *clnt;
1551 int err, rsize, non_zc = 0;
1552
1553
1554 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1555 fid->fid, (unsigned long long) offset, count);
1556 err = 0;
1557 clnt = fid->clnt;
1558
1559 rsize = fid->iounit;
1560 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1561 rsize = clnt->msize - P9_IOHDRSZ;
1562
1563 if (count < rsize)
1564 rsize = count;
1565
1566 /* Don't bother zerocopy for small IO (< 1024) */
1567 if (clnt->trans_mod->zc_request && rsize > 1024) {
1568 char *indata;
1569 if (data) {
1570 kernel_buf = 1;
1571 indata = data;
1572 } else
1573 indata = (__force char *)udata;
1574 /*
1575 * response header len is 11
1576 * PDU Header(7) + IO Size (4)
1577 */
1578 req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0,
1579 11, kernel_buf, "dqd", fid->fid,
1580 offset, rsize);
1581 } else {
1582 non_zc = 1;
1583 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1584 rsize);
1585 }
1586 if (IS_ERR(req)) {
1587 err = PTR_ERR(req);
1588 goto error;
1589 }
1590
1591 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1592 if (err) {
1593 trace_9p_protocol_dump(clnt, req->rc);
1594 goto free_and_error;
1595 }
1596
1597 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1598
1599 if (non_zc) {
1600 if (data) {
1601 memmove(data, dataptr, count);
1602 } else {
1603 err = copy_to_user(udata, dataptr, count);
1604 if (err) {
1605 err = -EFAULT;
1606 goto free_and_error;
1607 }
1608 }
1609 }
1610 p9_free_req(clnt, req);
1611 return count;
1612
1613 free_and_error:
1614 p9_free_req(clnt, req);
1615 error:
1616 return err;
1617 }
1618 EXPORT_SYMBOL(p9_client_read);
1619
1620 int
1621 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1622 u64 offset, u32 count)
1623 {
1624 int err, rsize;
1625 int kernel_buf = 0;
1626 struct p9_client *clnt;
1627 struct p9_req_t *req;
1628
1629 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1630 fid->fid, (unsigned long long) offset, count);
1631 err = 0;
1632 clnt = fid->clnt;
1633
1634 rsize = fid->iounit;
1635 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1636 rsize = clnt->msize - P9_IOHDRSZ;
1637
1638 if (count < rsize)
1639 rsize = count;
1640
1641 /* Don't bother zerocopy for small IO (< 1024) */
1642 if (clnt->trans_mod->zc_request && rsize > 1024) {
1643 char *odata;
1644 if (data) {
1645 kernel_buf = 1;
1646 odata = data;
1647 } else
1648 odata = (char *)udata;
1649 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize,
1650 P9_ZC_HDR_SZ, kernel_buf, "dqd",
1651 fid->fid, offset, rsize);
1652 } else {
1653 if (data)
1654 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
1655 offset, rsize, data);
1656 else
1657 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
1658 offset, rsize, udata);
1659 }
1660 if (IS_ERR(req)) {
1661 err = PTR_ERR(req);
1662 goto error;
1663 }
1664
1665 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1666 if (err) {
1667 trace_9p_protocol_dump(clnt, req->rc);
1668 goto free_and_error;
1669 }
1670
1671 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1672
1673 p9_free_req(clnt, req);
1674 return count;
1675
1676 free_and_error:
1677 p9_free_req(clnt, req);
1678 error:
1679 return err;
1680 }
1681 EXPORT_SYMBOL(p9_client_write);
1682
1683 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1684 {
1685 int err;
1686 struct p9_client *clnt;
1687 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1688 struct p9_req_t *req;
1689 u16 ignored;
1690
1691 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1692
1693 if (!ret)
1694 return ERR_PTR(-ENOMEM);
1695
1696 err = 0;
1697 clnt = fid->clnt;
1698
1699 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1700 if (IS_ERR(req)) {
1701 err = PTR_ERR(req);
1702 goto error;
1703 }
1704
1705 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1706 if (err) {
1707 trace_9p_protocol_dump(clnt, req->rc);
1708 p9_free_req(clnt, req);
1709 goto error;
1710 }
1711
1712 p9_debug(P9_DEBUG_9P,
1713 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1714 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1715 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1716 "<<< uid=%d gid=%d n_muid=%d\n",
1717 ret->size, ret->type, ret->dev, ret->qid.type,
1718 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1719 ret->atime, ret->mtime, (unsigned long long)ret->length,
1720 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1721 from_kuid(&init_user_ns, ret->n_uid),
1722 from_kgid(&init_user_ns, ret->n_gid),
1723 from_kuid(&init_user_ns, ret->n_muid));
1724
1725 p9_free_req(clnt, req);
1726 return ret;
1727
1728 error:
1729 kfree(ret);
1730 return ERR_PTR(err);
1731 }
1732 EXPORT_SYMBOL(p9_client_stat);
1733
1734 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1735 u64 request_mask)
1736 {
1737 int err;
1738 struct p9_client *clnt;
1739 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1740 GFP_KERNEL);
1741 struct p9_req_t *req;
1742
1743 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1744 fid->fid, request_mask);
1745
1746 if (!ret)
1747 return ERR_PTR(-ENOMEM);
1748
1749 err = 0;
1750 clnt = fid->clnt;
1751
1752 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1753 if (IS_ERR(req)) {
1754 err = PTR_ERR(req);
1755 goto error;
1756 }
1757
1758 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1759 if (err) {
1760 trace_9p_protocol_dump(clnt, req->rc);
1761 p9_free_req(clnt, req);
1762 goto error;
1763 }
1764
1765 p9_debug(P9_DEBUG_9P,
1766 "<<< RGETATTR st_result_mask=%lld\n"
1767 "<<< qid=%x.%llx.%x\n"
1768 "<<< st_mode=%8.8x st_nlink=%llu\n"
1769 "<<< st_uid=%d st_gid=%d\n"
1770 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1771 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1772 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1773 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1774 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1775 "<<< st_gen=%lld st_data_version=%lld",
1776 ret->st_result_mask, ret->qid.type, ret->qid.path,
1777 ret->qid.version, ret->st_mode, ret->st_nlink,
1778 from_kuid(&init_user_ns, ret->st_uid),
1779 from_kgid(&init_user_ns, ret->st_gid),
1780 ret->st_rdev, ret->st_size, ret->st_blksize,
1781 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1782 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1783 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1784 ret->st_gen, ret->st_data_version);
1785
1786 p9_free_req(clnt, req);
1787 return ret;
1788
1789 error:
1790 kfree(ret);
1791 return ERR_PTR(err);
1792 }
1793 EXPORT_SYMBOL(p9_client_getattr_dotl);
1794
1795 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1796 {
1797 int ret;
1798
1799 /* NOTE: size shouldn't include its own length */
1800 /* size[2] type[2] dev[4] qid[13] */
1801 /* mode[4] atime[4] mtime[4] length[8]*/
1802 /* name[s] uid[s] gid[s] muid[s] */
1803 ret = 2+4+13+4+4+4+8+2+2+2+2;
1804
1805 if (wst->name)
1806 ret += strlen(wst->name);
1807 if (wst->uid)
1808 ret += strlen(wst->uid);
1809 if (wst->gid)
1810 ret += strlen(wst->gid);
1811 if (wst->muid)
1812 ret += strlen(wst->muid);
1813
1814 if ((proto_version == p9_proto_2000u) ||
1815 (proto_version == p9_proto_2000L)) {
1816 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1817 if (wst->extension)
1818 ret += strlen(wst->extension);
1819 }
1820
1821 return ret;
1822 }
1823
1824 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1825 {
1826 int err;
1827 struct p9_req_t *req;
1828 struct p9_client *clnt;
1829
1830 err = 0;
1831 clnt = fid->clnt;
1832 wst->size = p9_client_statsize(wst, clnt->proto_version);
1833 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1834 p9_debug(P9_DEBUG_9P,
1835 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1836 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1837 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1838 " uid=%d gid=%d n_muid=%d\n",
1839 wst->size, wst->type, wst->dev, wst->qid.type,
1840 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1841 wst->atime, wst->mtime, (unsigned long long)wst->length,
1842 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1843 from_kuid(&init_user_ns, wst->n_uid),
1844 from_kgid(&init_user_ns, wst->n_gid),
1845 from_kuid(&init_user_ns, wst->n_muid));
1846
1847 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1848 if (IS_ERR(req)) {
1849 err = PTR_ERR(req);
1850 goto error;
1851 }
1852
1853 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1854
1855 p9_free_req(clnt, req);
1856 error:
1857 return err;
1858 }
1859 EXPORT_SYMBOL(p9_client_wstat);
1860
1861 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1862 {
1863 int err;
1864 struct p9_req_t *req;
1865 struct p9_client *clnt;
1866
1867 err = 0;
1868 clnt = fid->clnt;
1869 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1870 p9_debug(P9_DEBUG_9P,
1871 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1872 " atime_sec=%lld atime_nsec=%lld\n"
1873 " mtime_sec=%lld mtime_nsec=%lld\n",
1874 p9attr->valid, p9attr->mode,
1875 from_kuid(&init_user_ns, p9attr->uid),
1876 from_kgid(&init_user_ns, p9attr->gid),
1877 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1878 p9attr->mtime_sec, p9attr->mtime_nsec);
1879
1880 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1881
1882 if (IS_ERR(req)) {
1883 err = PTR_ERR(req);
1884 goto error;
1885 }
1886 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1887 p9_free_req(clnt, req);
1888 error:
1889 return err;
1890 }
1891 EXPORT_SYMBOL(p9_client_setattr);
1892
1893 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1894 {
1895 int err;
1896 struct p9_req_t *req;
1897 struct p9_client *clnt;
1898
1899 err = 0;
1900 clnt = fid->clnt;
1901
1902 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1903
1904 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1905 if (IS_ERR(req)) {
1906 err = PTR_ERR(req);
1907 goto error;
1908 }
1909
1910 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1911 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1912 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1913 if (err) {
1914 trace_9p_protocol_dump(clnt, req->rc);
1915 p9_free_req(clnt, req);
1916 goto error;
1917 }
1918
1919 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1920 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1921 "fsid %llu namelen %ld\n",
1922 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1923 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1924 sb->fsid, (long int)sb->namelen);
1925
1926 p9_free_req(clnt, req);
1927 error:
1928 return err;
1929 }
1930 EXPORT_SYMBOL(p9_client_statfs);
1931
1932 int p9_client_rename(struct p9_fid *fid,
1933 struct p9_fid *newdirfid, const char *name)
1934 {
1935 int err;
1936 struct p9_req_t *req;
1937 struct p9_client *clnt;
1938
1939 err = 0;
1940 clnt = fid->clnt;
1941
1942 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1943 fid->fid, newdirfid->fid, name);
1944
1945 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1946 newdirfid->fid, name);
1947 if (IS_ERR(req)) {
1948 err = PTR_ERR(req);
1949 goto error;
1950 }
1951
1952 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1953
1954 p9_free_req(clnt, req);
1955 error:
1956 return err;
1957 }
1958 EXPORT_SYMBOL(p9_client_rename);
1959
1960 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1961 struct p9_fid *newdirfid, const char *new_name)
1962 {
1963 int err;
1964 struct p9_req_t *req;
1965 struct p9_client *clnt;
1966
1967 err = 0;
1968 clnt = olddirfid->clnt;
1969
1970 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1971 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1972 newdirfid->fid, new_name);
1973
1974 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1975 old_name, newdirfid->fid, new_name);
1976 if (IS_ERR(req)) {
1977 err = PTR_ERR(req);
1978 goto error;
1979 }
1980
1981 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1982 newdirfid->fid, new_name);
1983
1984 p9_free_req(clnt, req);
1985 error:
1986 return err;
1987 }
1988 EXPORT_SYMBOL(p9_client_renameat);
1989
1990 /*
1991 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1992 */
1993 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1994 const char *attr_name, u64 *attr_size)
1995 {
1996 int err;
1997 struct p9_req_t *req;
1998 struct p9_client *clnt;
1999 struct p9_fid *attr_fid;
2000
2001 err = 0;
2002 clnt = file_fid->clnt;
2003 attr_fid = p9_fid_create(clnt);
2004 if (IS_ERR(attr_fid)) {
2005 err = PTR_ERR(attr_fid);
2006 attr_fid = NULL;
2007 goto error;
2008 }
2009 p9_debug(P9_DEBUG_9P,
2010 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
2011 file_fid->fid, attr_fid->fid, attr_name);
2012
2013 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
2014 file_fid->fid, attr_fid->fid, attr_name);
2015 if (IS_ERR(req)) {
2016 err = PTR_ERR(req);
2017 goto error;
2018 }
2019 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
2020 if (err) {
2021 trace_9p_protocol_dump(clnt, req->rc);
2022 p9_free_req(clnt, req);
2023 goto clunk_fid;
2024 }
2025 p9_free_req(clnt, req);
2026 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2027 attr_fid->fid, *attr_size);
2028 return attr_fid;
2029 clunk_fid:
2030 p9_client_clunk(attr_fid);
2031 attr_fid = NULL;
2032 error:
2033 if (attr_fid && (attr_fid != file_fid))
2034 p9_fid_destroy(attr_fid);
2035
2036 return ERR_PTR(err);
2037 }
2038 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2039
2040 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2041 u64 attr_size, int flags)
2042 {
2043 int err;
2044 struct p9_req_t *req;
2045 struct p9_client *clnt;
2046
2047 p9_debug(P9_DEBUG_9P,
2048 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2049 fid->fid, name, (long long)attr_size, flags);
2050 err = 0;
2051 clnt = fid->clnt;
2052 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2053 fid->fid, name, attr_size, flags);
2054 if (IS_ERR(req)) {
2055 err = PTR_ERR(req);
2056 goto error;
2057 }
2058 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2059 p9_free_req(clnt, req);
2060 error:
2061 return err;
2062 }
2063 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2064
2065 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2066 {
2067 int err, rsize, non_zc = 0;
2068 struct p9_client *clnt;
2069 struct p9_req_t *req;
2070 char *dataptr;
2071
2072 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2073 fid->fid, (unsigned long long) offset, count);
2074
2075 err = 0;
2076 clnt = fid->clnt;
2077
2078 rsize = fid->iounit;
2079 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2080 rsize = clnt->msize - P9_READDIRHDRSZ;
2081
2082 if (count < rsize)
2083 rsize = count;
2084
2085 /* Don't bother zerocopy for small IO (< 1024) */
2086 if (clnt->trans_mod->zc_request && rsize > 1024) {
2087 /*
2088 * response header len is 11
2089 * PDU Header(7) + IO Size (4)
2090 */
2091 req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0,
2092 11, 1, "dqd", fid->fid, offset, rsize);
2093 } else {
2094 non_zc = 1;
2095 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2096 offset, rsize);
2097 }
2098 if (IS_ERR(req)) {
2099 err = PTR_ERR(req);
2100 goto error;
2101 }
2102
2103 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2104 if (err) {
2105 trace_9p_protocol_dump(clnt, req->rc);
2106 goto free_and_error;
2107 }
2108
2109 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2110
2111 if (non_zc)
2112 memmove(data, dataptr, count);
2113
2114 p9_free_req(clnt, req);
2115 return count;
2116
2117 free_and_error:
2118 p9_free_req(clnt, req);
2119 error:
2120 return err;
2121 }
2122 EXPORT_SYMBOL(p9_client_readdir);
2123
2124 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
2125 dev_t rdev, kgid_t gid, struct p9_qid *qid)
2126 {
2127 int err;
2128 struct p9_client *clnt;
2129 struct p9_req_t *req;
2130
2131 err = 0;
2132 clnt = fid->clnt;
2133 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2134 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2135 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2136 MAJOR(rdev), MINOR(rdev), gid);
2137 if (IS_ERR(req))
2138 return PTR_ERR(req);
2139
2140 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2141 if (err) {
2142 trace_9p_protocol_dump(clnt, req->rc);
2143 goto error;
2144 }
2145 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2146 (unsigned long long)qid->path, qid->version);
2147
2148 error:
2149 p9_free_req(clnt, req);
2150 return err;
2151
2152 }
2153 EXPORT_SYMBOL(p9_client_mknod_dotl);
2154
2155 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
2156 kgid_t gid, struct p9_qid *qid)
2157 {
2158 int err;
2159 struct p9_client *clnt;
2160 struct p9_req_t *req;
2161
2162 err = 0;
2163 clnt = fid->clnt;
2164 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2165 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2166 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
2167 gid);
2168 if (IS_ERR(req))
2169 return PTR_ERR(req);
2170
2171 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2172 if (err) {
2173 trace_9p_protocol_dump(clnt, req->rc);
2174 goto error;
2175 }
2176 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2177 (unsigned long long)qid->path, qid->version);
2178
2179 error:
2180 p9_free_req(clnt, req);
2181 return err;
2182
2183 }
2184 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2185
2186 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2187 {
2188 int err;
2189 struct p9_client *clnt;
2190 struct p9_req_t *req;
2191
2192 err = 0;
2193 clnt = fid->clnt;
2194 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2195 "start %lld length %lld proc_id %d client_id %s\n",
2196 fid->fid, flock->type, flock->flags, flock->start,
2197 flock->length, flock->proc_id, flock->client_id);
2198
2199 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2200 flock->flags, flock->start, flock->length,
2201 flock->proc_id, flock->client_id);
2202
2203 if (IS_ERR(req))
2204 return PTR_ERR(req);
2205
2206 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2207 if (err) {
2208 trace_9p_protocol_dump(clnt, req->rc);
2209 goto error;
2210 }
2211 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2212 error:
2213 p9_free_req(clnt, req);
2214 return err;
2215
2216 }
2217 EXPORT_SYMBOL(p9_client_lock_dotl);
2218
2219 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2220 {
2221 int err;
2222 struct p9_client *clnt;
2223 struct p9_req_t *req;
2224
2225 err = 0;
2226 clnt = fid->clnt;
2227 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2228 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2229 glock->start, glock->length, glock->proc_id, glock->client_id);
2230
2231 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2232 glock->start, glock->length, glock->proc_id, glock->client_id);
2233
2234 if (IS_ERR(req))
2235 return PTR_ERR(req);
2236
2237 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2238 &glock->start, &glock->length, &glock->proc_id,
2239 &glock->client_id);
2240 if (err) {
2241 trace_9p_protocol_dump(clnt, req->rc);
2242 goto error;
2243 }
2244 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2245 "proc_id %d client_id %s\n", glock->type, glock->start,
2246 glock->length, glock->proc_id, glock->client_id);
2247 error:
2248 p9_free_req(clnt, req);
2249 return err;
2250 }
2251 EXPORT_SYMBOL(p9_client_getlock_dotl);
2252
2253 int p9_client_readlink(struct p9_fid *fid, char **target)
2254 {
2255 int err;
2256 struct p9_client *clnt;
2257 struct p9_req_t *req;
2258
2259 err = 0;
2260 clnt = fid->clnt;
2261 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2262
2263 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2264 if (IS_ERR(req))
2265 return PTR_ERR(req);
2266
2267 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2268 if (err) {
2269 trace_9p_protocol_dump(clnt, req->rc);
2270 goto error;
2271 }
2272 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2273 error:
2274 p9_free_req(clnt, req);
2275 return err;
2276 }
2277 EXPORT_SYMBOL(p9_client_readlink);
(deprecated) Btrfs devel tree