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Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
[linux-2.6.git] / net / 9p / client.c
blob8b93cae2d11d7d013d50c276bd08fc11a1187d08
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 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)
419 {
420 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
421 wake_up(req->wq);
422 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
423 }
424 EXPORT_SYMBOL(p9_client_cb);
425
426 /**
427 * p9_parse_header - parse header arguments out of a packet
428 * @pdu: packet to parse
429 * @size: size of packet
430 * @type: type of request
431 * @tag: tag of packet
432 * @rewind: set if we need to rewind offset afterwards
433 */
434
435 int
436 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
437 int rewind)
438 {
439 int8_t r_type;
440 int16_t r_tag;
441 int32_t r_size;
442 int offset = pdu->offset;
443 int err;
444
445 pdu->offset = 0;
446 if (pdu->size == 0)
447 pdu->size = 7;
448
449 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
450 if (err)
451 goto rewind_and_exit;
452
453 pdu->size = r_size;
454 pdu->id = r_type;
455 pdu->tag = r_tag;
456
457 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
458 pdu->size, pdu->id, pdu->tag);
459
460 if (type)
461 *type = r_type;
462 if (tag)
463 *tag = r_tag;
464 if (size)
465 *size = r_size;
466
467
468 rewind_and_exit:
469 if (rewind)
470 pdu->offset = offset;
471 return err;
472 }
473 EXPORT_SYMBOL(p9_parse_header);
474
475 /**
476 * p9_check_errors - check 9p packet for error return and process it
477 * @c: current client instance
478 * @req: request to parse and check for error conditions
479 *
480 * returns error code if one is discovered, otherwise returns 0
481 *
482 * this will have to be more complicated if we have multiple
483 * error packet types
484 */
485
486 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
487 {
488 int8_t type;
489 int err;
490 int ecode;
491
492 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
493 /*
494 * dump the response from server
495 * This should be after check errors which poplulate pdu_fcall.
496 */
497 trace_9p_protocol_dump(c, req->rc);
498 if (err) {
499 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
500 return err;
501 }
502 if (type != P9_RERROR && type != P9_RLERROR)
503 return 0;
504
505 if (!p9_is_proto_dotl(c)) {
506 char *ename;
507 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
508 &ename, &ecode);
509 if (err)
510 goto out_err;
511
512 if (p9_is_proto_dotu(c))
513 err = -ecode;
514
515 if (!err || !IS_ERR_VALUE(err)) {
516 err = p9_errstr2errno(ename, strlen(ename));
517
518 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
519 -ecode, ename);
520 }
521 kfree(ename);
522 } else {
523 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
524 err = -ecode;
525
526 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
527 }
528
529 return err;
530
531 out_err:
532 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
533
534 return err;
535 }
536
537 /**
538 * p9_check_zc_errors - check 9p packet for error return and process it
539 * @c: current client instance
540 * @req: request to parse and check for error conditions
541 * @in_hdrlen: Size of response protocol buffer.
542 *
543 * returns error code if one is discovered, otherwise returns 0
544 *
545 * this will have to be more complicated if we have multiple
546 * error packet types
547 */
548
549 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
550 char *uidata, int in_hdrlen, int kern_buf)
551 {
552 int err;
553 int ecode;
554 int8_t type;
555 char *ename = NULL;
556
557 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
558 /*
559 * dump the response from server
560 * This should be after parse_header which poplulate pdu_fcall.
561 */
562 trace_9p_protocol_dump(c, req->rc);
563 if (err) {
564 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
565 return err;
566 }
567
568 if (type != P9_RERROR && type != P9_RLERROR)
569 return 0;
570
571 if (!p9_is_proto_dotl(c)) {
572 /* Error is reported in string format */
573 int len;
574 /* 7 = header size for RERROR; */
575 int inline_len = in_hdrlen - 7;
576
577 len = req->rc->size - req->rc->offset;
578 if (len > (P9_ZC_HDR_SZ - 7)) {
579 err = -EFAULT;
580 goto out_err;
581 }
582
583 ename = &req->rc->sdata[req->rc->offset];
584 if (len > inline_len) {
585 /* We have error in external buffer */
586 if (kern_buf) {
587 memcpy(ename + inline_len, uidata,
588 len - inline_len);
589 } else {
590 err = copy_from_user(ename + inline_len,
591 uidata, len - inline_len);
592 if (err) {
593 err = -EFAULT;
594 goto out_err;
595 }
596 }
597 }
598 ename = NULL;
599 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
600 &ename, &ecode);
601 if (err)
602 goto out_err;
603
604 if (p9_is_proto_dotu(c))
605 err = -ecode;
606
607 if (!err || !IS_ERR_VALUE(err)) {
608 err = p9_errstr2errno(ename, strlen(ename));
609
610 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
611 -ecode, ename);
612 }
613 kfree(ename);
614 } else {
615 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
616 err = -ecode;
617
618 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
619 }
620 return err;
621
622 out_err:
623 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
624 return err;
625 }
626
627 static struct p9_req_t *
628 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
629
630 /**
631 * p9_client_flush - flush (cancel) a request
632 * @c: client state
633 * @oldreq: request to cancel
634 *
635 * This sents a flush for a particular request and links
636 * the flush request to the original request. The current
637 * code only supports a single flush request although the protocol
638 * allows for multiple flush requests to be sent for a single request.
639 *
640 */
641
642 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
643 {
644 struct p9_req_t *req;
645 int16_t oldtag;
646 int err;
647
648 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
649 if (err)
650 return err;
651
652 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
653
654 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
655 if (IS_ERR(req))
656 return PTR_ERR(req);
657
658
659 /*
660 * if we haven't received a response for oldreq,
661 * remove it from the list, and notify the transport
662 * layer that the reply will never arrive.
663 */
664 spin_lock(&c->lock);
665 if (oldreq->status == REQ_STATUS_FLSH) {
666 list_del(&oldreq->req_list);
667 spin_unlock(&c->lock);
668 if (c->trans_mod->cancelled)
669 c->trans_mod->cancelled(c, req);
670 } else {
671 spin_unlock(&c->lock);
672 }
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 if ((err == -ERESTARTSYS) && (c->status == Connected)
760 && (type == P9_TFLUSH)) {
761 sigpending = 1;
762 clear_thread_flag(TIF_SIGPENDING);
763 goto again;
764 }
765
766 if (req->status == REQ_STATUS_ERROR) {
767 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
768 err = req->t_err;
769 }
770 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
771 p9_debug(P9_DEBUG_MUX, "flushing\n");
772 sigpending = 1;
773 clear_thread_flag(TIF_SIGPENDING);
774
775 if (c->trans_mod->cancel(c, req))
776 p9_client_flush(c, req);
777
778 /* if we received the response anyway, don't signal error */
779 if (req->status == REQ_STATUS_RCVD)
780 err = 0;
781 }
782 if (sigpending) {
783 spin_lock_irqsave(&current->sighand->siglock, flags);
784 recalc_sigpending();
785 spin_unlock_irqrestore(&current->sighand->siglock, flags);
786 }
787 if (err < 0)
788 goto reterr;
789
790 err = p9_check_errors(c, req);
791 trace_9p_client_res(c, type, req->rc->tag, err);
792 if (!err)
793 return req;
794 reterr:
795 p9_free_req(c, req);
796 return ERR_PTR(safe_errno(err));
797 }
798
799 /**
800 * p9_client_zc_rpc - issue a request and wait for a response
801 * @c: client session
802 * @type: type of request
803 * @uidata: user bffer that should be ued for zero copy read
804 * @uodata: user buffer that shoud be user for zero copy write
805 * @inlen: read buffer size
806 * @olen: write buffer size
807 * @hdrlen: reader header size, This is the size of response protocol data
808 * @fmt: protocol format string (see protocol.c)
809 *
810 * Returns request structure (which client must free using p9_free_req)
811 */
812 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
813 char *uidata, char *uodata,
814 int inlen, int olen, int in_hdrlen,
815 int kern_buf, const char *fmt, ...)
816 {
817 va_list ap;
818 int sigpending, err;
819 unsigned long flags;
820 struct p9_req_t *req;
821
822 va_start(ap, fmt);
823 /*
824 * We allocate a inline protocol data of only 4k bytes.
825 * The actual content is passed in zero-copy fashion.
826 */
827 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
828 va_end(ap);
829 if (IS_ERR(req))
830 return req;
831
832 if (signal_pending(current)) {
833 sigpending = 1;
834 clear_thread_flag(TIF_SIGPENDING);
835 } else
836 sigpending = 0;
837
838 /* If we are called with KERNEL_DS force kern_buf */
839 if (segment_eq(get_fs(), KERNEL_DS))
840 kern_buf = 1;
841
842 err = c->trans_mod->zc_request(c, req, uidata, uodata,
843 inlen, olen, in_hdrlen, kern_buf);
844 if (err < 0) {
845 if (err == -EIO)
846 c->status = Disconnected;
847 goto reterr;
848 }
849 if (req->status == REQ_STATUS_ERROR) {
850 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
851 err = req->t_err;
852 }
853 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
854 p9_debug(P9_DEBUG_MUX, "flushing\n");
855 sigpending = 1;
856 clear_thread_flag(TIF_SIGPENDING);
857
858 if (c->trans_mod->cancel(c, req))
859 p9_client_flush(c, req);
860
861 /* if we received the response anyway, don't signal error */
862 if (req->status == REQ_STATUS_RCVD)
863 err = 0;
864 }
865 if (sigpending) {
866 spin_lock_irqsave(&current->sighand->siglock, flags);
867 recalc_sigpending();
868 spin_unlock_irqrestore(&current->sighand->siglock, flags);
869 }
870 if (err < 0)
871 goto reterr;
872
873 err = p9_check_zc_errors(c, req, uidata, in_hdrlen, kern_buf);
874 trace_9p_client_res(c, type, req->rc->tag, err);
875 if (!err)
876 return req;
877 reterr:
878 p9_free_req(c, req);
879 return ERR_PTR(safe_errno(err));
880 }
881
882 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
883 {
884 int ret;
885 struct p9_fid *fid;
886 unsigned long flags;
887
888 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
889 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
890 if (!fid)
891 return ERR_PTR(-ENOMEM);
892
893 ret = p9_idpool_get(clnt->fidpool);
894 if (ret < 0) {
895 ret = -ENOSPC;
896 goto error;
897 }
898 fid->fid = ret;
899
900 memset(&fid->qid, 0, sizeof(struct p9_qid));
901 fid->mode = -1;
902 fid->uid = current_fsuid();
903 fid->clnt = clnt;
904 fid->rdir = NULL;
905 spin_lock_irqsave(&clnt->lock, flags);
906 list_add(&fid->flist, &clnt->fidlist);
907 spin_unlock_irqrestore(&clnt->lock, flags);
908
909 return fid;
910
911 error:
912 kfree(fid);
913 return ERR_PTR(ret);
914 }
915
916 static void p9_fid_destroy(struct p9_fid *fid)
917 {
918 struct p9_client *clnt;
919 unsigned long flags;
920
921 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
922 clnt = fid->clnt;
923 p9_idpool_put(fid->fid, clnt->fidpool);
924 spin_lock_irqsave(&clnt->lock, flags);
925 list_del(&fid->flist);
926 spin_unlock_irqrestore(&clnt->lock, flags);
927 kfree(fid->rdir);
928 kfree(fid);
929 }
930
931 static int p9_client_version(struct p9_client *c)
932 {
933 int err = 0;
934 struct p9_req_t *req;
935 char *version;
936 int msize;
937
938 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
939 c->msize, c->proto_version);
940
941 switch (c->proto_version) {
942 case p9_proto_2000L:
943 req = p9_client_rpc(c, P9_TVERSION, "ds",
944 c->msize, "9P2000.L");
945 break;
946 case p9_proto_2000u:
947 req = p9_client_rpc(c, P9_TVERSION, "ds",
948 c->msize, "9P2000.u");
949 break;
950 case p9_proto_legacy:
951 req = p9_client_rpc(c, P9_TVERSION, "ds",
952 c->msize, "9P2000");
953 break;
954 default:
955 return -EINVAL;
956 break;
957 }
958
959 if (IS_ERR(req))
960 return PTR_ERR(req);
961
962 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
963 if (err) {
964 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
965 trace_9p_protocol_dump(c, req->rc);
966 goto error;
967 }
968
969 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
970 if (!strncmp(version, "9P2000.L", 8))
971 c->proto_version = p9_proto_2000L;
972 else if (!strncmp(version, "9P2000.u", 8))
973 c->proto_version = p9_proto_2000u;
974 else if (!strncmp(version, "9P2000", 6))
975 c->proto_version = p9_proto_legacy;
976 else {
977 err = -EREMOTEIO;
978 goto error;
979 }
980
981 if (msize < c->msize)
982 c->msize = msize;
983
984 error:
985 kfree(version);
986 p9_free_req(c, req);
987
988 return err;
989 }
990
991 struct p9_client *p9_client_create(const char *dev_name, char *options)
992 {
993 int err;
994 struct p9_client *clnt;
995
996 err = 0;
997 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
998 if (!clnt)
999 return ERR_PTR(-ENOMEM);
1000
1001 clnt->trans_mod = NULL;
1002 clnt->trans = NULL;
1003 spin_lock_init(&clnt->lock);
1004 INIT_LIST_HEAD(&clnt->fidlist);
1005
1006 err = p9_tag_init(clnt);
1007 if (err < 0)
1008 goto free_client;
1009
1010 err = parse_opts(options, clnt);
1011 if (err < 0)
1012 goto destroy_tagpool;
1013
1014 if (!clnt->trans_mod)
1015 clnt->trans_mod = v9fs_get_trans_by_name("virtio");
1016
1017 if (!clnt->trans_mod)
1018 clnt->trans_mod = v9fs_get_default_trans();
1019
1020 if (clnt->trans_mod == NULL) {
1021 err = -EPROTONOSUPPORT;
1022 p9_debug(P9_DEBUG_ERROR,
1023 "No transport defined or default transport\n");
1024 goto destroy_tagpool;
1025 }
1026
1027 clnt->fidpool = p9_idpool_create();
1028 if (IS_ERR(clnt->fidpool)) {
1029 err = PTR_ERR(clnt->fidpool);
1030 goto put_trans;
1031 }
1032
1033 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1034 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1035
1036 err = clnt->trans_mod->create(clnt, dev_name, options);
1037 if (err)
1038 goto destroy_fidpool;
1039
1040 if (clnt->msize > clnt->trans_mod->maxsize)
1041 clnt->msize = clnt->trans_mod->maxsize;
1042
1043 err = p9_client_version(clnt);
1044 if (err)
1045 goto close_trans;
1046
1047 return clnt;
1048
1049 close_trans:
1050 clnt->trans_mod->close(clnt);
1051 destroy_fidpool:
1052 p9_idpool_destroy(clnt->fidpool);
1053 put_trans:
1054 v9fs_put_trans(clnt->trans_mod);
1055 destroy_tagpool:
1056 p9_idpool_destroy(clnt->tagpool);
1057 free_client:
1058 kfree(clnt);
1059 return ERR_PTR(err);
1060 }
1061 EXPORT_SYMBOL(p9_client_create);
1062
1063 void p9_client_destroy(struct p9_client *clnt)
1064 {
1065 struct p9_fid *fid, *fidptr;
1066
1067 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1068
1069 if (clnt->trans_mod)
1070 clnt->trans_mod->close(clnt);
1071
1072 v9fs_put_trans(clnt->trans_mod);
1073
1074 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
1075 pr_info("Found fid %d not clunked\n", fid->fid);
1076 p9_fid_destroy(fid);
1077 }
1078
1079 if (clnt->fidpool)
1080 p9_idpool_destroy(clnt->fidpool);
1081
1082 p9_tag_cleanup(clnt);
1083
1084 kfree(clnt);
1085 }
1086 EXPORT_SYMBOL(p9_client_destroy);
1087
1088 void p9_client_disconnect(struct p9_client *clnt)
1089 {
1090 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1091 clnt->status = Disconnected;
1092 }
1093 EXPORT_SYMBOL(p9_client_disconnect);
1094
1095 void p9_client_begin_disconnect(struct p9_client *clnt)
1096 {
1097 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1098 clnt->status = BeginDisconnect;
1099 }
1100 EXPORT_SYMBOL(p9_client_begin_disconnect);
1101
1102 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1103 char *uname, kuid_t n_uname, char *aname)
1104 {
1105 int err = 0;
1106 struct p9_req_t *req;
1107 struct p9_fid *fid;
1108 struct p9_qid qid;
1109
1110
1111 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1112 afid ? afid->fid : -1, uname, aname);
1113 fid = p9_fid_create(clnt);
1114 if (IS_ERR(fid)) {
1115 err = PTR_ERR(fid);
1116 fid = NULL;
1117 goto error;
1118 }
1119
1120 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1121 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1122 if (IS_ERR(req)) {
1123 err = PTR_ERR(req);
1124 goto error;
1125 }
1126
1127 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
1128 if (err) {
1129 trace_9p_protocol_dump(clnt, req->rc);
1130 p9_free_req(clnt, req);
1131 goto error;
1132 }
1133
1134 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1135 qid.type, (unsigned long long)qid.path, qid.version);
1136
1137 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1138
1139 p9_free_req(clnt, req);
1140 return fid;
1141
1142 error:
1143 if (fid)
1144 p9_fid_destroy(fid);
1145 return ERR_PTR(err);
1146 }
1147 EXPORT_SYMBOL(p9_client_attach);
1148
1149 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1150 char **wnames, int clone)
1151 {
1152 int err;
1153 struct p9_client *clnt;
1154 struct p9_fid *fid;
1155 struct p9_qid *wqids;
1156 struct p9_req_t *req;
1157 uint16_t nwqids, count;
1158
1159 err = 0;
1160 wqids = NULL;
1161 clnt = oldfid->clnt;
1162 if (clone) {
1163 fid = p9_fid_create(clnt);
1164 if (IS_ERR(fid)) {
1165 err = PTR_ERR(fid);
1166 fid = NULL;
1167 goto error;
1168 }
1169
1170 fid->uid = oldfid->uid;
1171 } else
1172 fid = oldfid;
1173
1174
1175 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1176 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1177
1178 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1179 nwname, wnames);
1180 if (IS_ERR(req)) {
1181 err = PTR_ERR(req);
1182 goto error;
1183 }
1184
1185 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1186 if (err) {
1187 trace_9p_protocol_dump(clnt, req->rc);
1188 p9_free_req(clnt, req);
1189 goto clunk_fid;
1190 }
1191 p9_free_req(clnt, req);
1192
1193 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1194
1195 if (nwqids != nwname) {
1196 err = -ENOENT;
1197 goto clunk_fid;
1198 }
1199
1200 for (count = 0; count < nwqids; count++)
1201 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1202 count, wqids[count].type,
1203 (unsigned long long)wqids[count].path,
1204 wqids[count].version);
1205
1206 if (nwname)
1207 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1208 else
1209 fid->qid = oldfid->qid;
1210
1211 kfree(wqids);
1212 return fid;
1213
1214 clunk_fid:
1215 kfree(wqids);
1216 p9_client_clunk(fid);
1217 fid = NULL;
1218
1219 error:
1220 if (fid && (fid != oldfid))
1221 p9_fid_destroy(fid);
1222
1223 return ERR_PTR(err);
1224 }
1225 EXPORT_SYMBOL(p9_client_walk);
1226
1227 int p9_client_open(struct p9_fid *fid, int mode)
1228 {
1229 int err;
1230 struct p9_client *clnt;
1231 struct p9_req_t *req;
1232 struct p9_qid qid;
1233 int iounit;
1234
1235 clnt = fid->clnt;
1236 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1237 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1238 err = 0;
1239
1240 if (fid->mode != -1)
1241 return -EINVAL;
1242
1243 if (p9_is_proto_dotl(clnt))
1244 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1245 else
1246 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1247 if (IS_ERR(req)) {
1248 err = PTR_ERR(req);
1249 goto error;
1250 }
1251
1252 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1253 if (err) {
1254 trace_9p_protocol_dump(clnt, req->rc);
1255 goto free_and_error;
1256 }
1257
1258 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1259 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1260 (unsigned long long)qid.path, qid.version, iounit);
1261
1262 fid->mode = mode;
1263 fid->iounit = iounit;
1264
1265 free_and_error:
1266 p9_free_req(clnt, req);
1267 error:
1268 return err;
1269 }
1270 EXPORT_SYMBOL(p9_client_open);
1271
1272 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1273 kgid_t gid, struct p9_qid *qid)
1274 {
1275 int err = 0;
1276 struct p9_client *clnt;
1277 struct p9_req_t *req;
1278 int iounit;
1279
1280 p9_debug(P9_DEBUG_9P,
1281 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1282 ofid->fid, name, flags, mode,
1283 from_kgid(&init_user_ns, gid));
1284 clnt = ofid->clnt;
1285
1286 if (ofid->mode != -1)
1287 return -EINVAL;
1288
1289 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1290 mode, gid);
1291 if (IS_ERR(req)) {
1292 err = PTR_ERR(req);
1293 goto error;
1294 }
1295
1296 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1297 if (err) {
1298 trace_9p_protocol_dump(clnt, req->rc);
1299 goto free_and_error;
1300 }
1301
1302 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1303 qid->type,
1304 (unsigned long long)qid->path,
1305 qid->version, iounit);
1306
1307 ofid->mode = mode;
1308 ofid->iounit = iounit;
1309
1310 free_and_error:
1311 p9_free_req(clnt, req);
1312 error:
1313 return err;
1314 }
1315 EXPORT_SYMBOL(p9_client_create_dotl);
1316
1317 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1318 char *extension)
1319 {
1320 int err;
1321 struct p9_client *clnt;
1322 struct p9_req_t *req;
1323 struct p9_qid qid;
1324 int iounit;
1325
1326 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1327 fid->fid, name, perm, mode);
1328 err = 0;
1329 clnt = fid->clnt;
1330
1331 if (fid->mode != -1)
1332 return -EINVAL;
1333
1334 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1335 mode, extension);
1336 if (IS_ERR(req)) {
1337 err = PTR_ERR(req);
1338 goto error;
1339 }
1340
1341 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1342 if (err) {
1343 trace_9p_protocol_dump(clnt, req->rc);
1344 goto free_and_error;
1345 }
1346
1347 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1348 qid.type,
1349 (unsigned long long)qid.path,
1350 qid.version, iounit);
1351
1352 fid->mode = mode;
1353 fid->iounit = iounit;
1354
1355 free_and_error:
1356 p9_free_req(clnt, req);
1357 error:
1358 return err;
1359 }
1360 EXPORT_SYMBOL(p9_client_fcreate);
1361
1362 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, kgid_t gid,
1363 struct p9_qid *qid)
1364 {
1365 int err = 0;
1366 struct p9_client *clnt;
1367 struct p9_req_t *req;
1368
1369 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1370 dfid->fid, name, symtgt);
1371 clnt = dfid->clnt;
1372
1373 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1374 gid);
1375 if (IS_ERR(req)) {
1376 err = PTR_ERR(req);
1377 goto error;
1378 }
1379
1380 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1381 if (err) {
1382 trace_9p_protocol_dump(clnt, req->rc);
1383 goto free_and_error;
1384 }
1385
1386 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1387 qid->type, (unsigned long long)qid->path, qid->version);
1388
1389 free_and_error:
1390 p9_free_req(clnt, req);
1391 error:
1392 return err;
1393 }
1394 EXPORT_SYMBOL(p9_client_symlink);
1395
1396 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1397 {
1398 struct p9_client *clnt;
1399 struct p9_req_t *req;
1400
1401 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1402 dfid->fid, oldfid->fid, newname);
1403 clnt = dfid->clnt;
1404 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1405 newname);
1406 if (IS_ERR(req))
1407 return PTR_ERR(req);
1408
1409 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1410 p9_free_req(clnt, req);
1411 return 0;
1412 }
1413 EXPORT_SYMBOL(p9_client_link);
1414
1415 int p9_client_fsync(struct p9_fid *fid, int datasync)
1416 {
1417 int err;
1418 struct p9_client *clnt;
1419 struct p9_req_t *req;
1420
1421 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1422 fid->fid, datasync);
1423 err = 0;
1424 clnt = fid->clnt;
1425
1426 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1427 if (IS_ERR(req)) {
1428 err = PTR_ERR(req);
1429 goto error;
1430 }
1431
1432 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1433
1434 p9_free_req(clnt, req);
1435
1436 error:
1437 return err;
1438 }
1439 EXPORT_SYMBOL(p9_client_fsync);
1440
1441 int p9_client_clunk(struct p9_fid *fid)
1442 {
1443 int err;
1444 struct p9_client *clnt;
1445 struct p9_req_t *req;
1446 int retries = 0;
1447
1448 if (!fid) {
1449 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1450 __func__, task_pid_nr(current));
1451 dump_stack();
1452 return 0;
1453 }
1454
1455 again:
1456 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1457 retries);
1458 err = 0;
1459 clnt = fid->clnt;
1460
1461 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1462 if (IS_ERR(req)) {
1463 err = PTR_ERR(req);
1464 goto error;
1465 }
1466
1467 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1468
1469 p9_free_req(clnt, req);
1470 error:
1471 /*
1472 * Fid is not valid even after a failed clunk
1473 * If interrupted, retry once then give up and
1474 * leak fid until umount.
1475 */
1476 if (err == -ERESTARTSYS) {
1477 if (retries++ == 0)
1478 goto again;
1479 } else
1480 p9_fid_destroy(fid);
1481 return err;
1482 }
1483 EXPORT_SYMBOL(p9_client_clunk);
1484
1485 int p9_client_remove(struct p9_fid *fid)
1486 {
1487 int err;
1488 struct p9_client *clnt;
1489 struct p9_req_t *req;
1490
1491 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1492 err = 0;
1493 clnt = fid->clnt;
1494
1495 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1496 if (IS_ERR(req)) {
1497 err = PTR_ERR(req);
1498 goto error;
1499 }
1500
1501 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1502
1503 p9_free_req(clnt, req);
1504 error:
1505 if (err == -ERESTARTSYS)
1506 p9_client_clunk(fid);
1507 else
1508 p9_fid_destroy(fid);
1509 return err;
1510 }
1511 EXPORT_SYMBOL(p9_client_remove);
1512
1513 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1514 {
1515 int err = 0;
1516 struct p9_req_t *req;
1517 struct p9_client *clnt;
1518
1519 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1520 dfid->fid, name, flags);
1521
1522 clnt = dfid->clnt;
1523 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1524 if (IS_ERR(req)) {
1525 err = PTR_ERR(req);
1526 goto error;
1527 }
1528 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1529
1530 p9_free_req(clnt, req);
1531 error:
1532 return err;
1533 }
1534 EXPORT_SYMBOL(p9_client_unlinkat);
1535
1536 int
1537 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1538 u32 count)
1539 {
1540 char *dataptr;
1541 int kernel_buf = 0;
1542 struct p9_req_t *req;
1543 struct p9_client *clnt;
1544 int err, rsize, non_zc = 0;
1545
1546
1547 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1548 fid->fid, (unsigned long long) offset, count);
1549 err = 0;
1550 clnt = fid->clnt;
1551
1552 rsize = fid->iounit;
1553 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1554 rsize = clnt->msize - P9_IOHDRSZ;
1555
1556 if (count < rsize)
1557 rsize = count;
1558
1559 /* Don't bother zerocopy for small IO (< 1024) */
1560 if (clnt->trans_mod->zc_request && rsize > 1024) {
1561 char *indata;
1562 if (data) {
1563 kernel_buf = 1;
1564 indata = data;
1565 } else
1566 indata = (__force char *)udata;
1567 /*
1568 * response header len is 11
1569 * PDU Header(7) + IO Size (4)
1570 */
1571 req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0,
1572 11, kernel_buf, "dqd", fid->fid,
1573 offset, rsize);
1574 } else {
1575 non_zc = 1;
1576 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1577 rsize);
1578 }
1579 if (IS_ERR(req)) {
1580 err = PTR_ERR(req);
1581 goto error;
1582 }
1583
1584 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1585 if (err) {
1586 trace_9p_protocol_dump(clnt, req->rc);
1587 goto free_and_error;
1588 }
1589
1590 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1591
1592 if (non_zc) {
1593 if (data) {
1594 memmove(data, dataptr, count);
1595 } else {
1596 err = copy_to_user(udata, dataptr, count);
1597 if (err) {
1598 err = -EFAULT;
1599 goto free_and_error;
1600 }
1601 }
1602 }
1603 p9_free_req(clnt, req);
1604 return count;
1605
1606 free_and_error:
1607 p9_free_req(clnt, req);
1608 error:
1609 return err;
1610 }
1611 EXPORT_SYMBOL(p9_client_read);
1612
1613 int
1614 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1615 u64 offset, u32 count)
1616 {
1617 int err, rsize;
1618 int kernel_buf = 0;
1619 struct p9_client *clnt;
1620 struct p9_req_t *req;
1621
1622 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1623 fid->fid, (unsigned long long) offset, count);
1624 err = 0;
1625 clnt = fid->clnt;
1626
1627 rsize = fid->iounit;
1628 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1629 rsize = clnt->msize - P9_IOHDRSZ;
1630
1631 if (count < rsize)
1632 rsize = count;
1633
1634 /* Don't bother zerocopy for small IO (< 1024) */
1635 if (clnt->trans_mod->zc_request && rsize > 1024) {
1636 char *odata;
1637 if (data) {
1638 kernel_buf = 1;
1639 odata = data;
1640 } else
1641 odata = (char *)udata;
1642 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize,
1643 P9_ZC_HDR_SZ, kernel_buf, "dqd",
1644 fid->fid, offset, rsize);
1645 } else {
1646 if (data)
1647 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
1648 offset, rsize, data);
1649 else
1650 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
1651 offset, rsize, udata);
1652 }
1653 if (IS_ERR(req)) {
1654 err = PTR_ERR(req);
1655 goto error;
1656 }
1657
1658 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1659 if (err) {
1660 trace_9p_protocol_dump(clnt, req->rc);
1661 goto free_and_error;
1662 }
1663
1664 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1665
1666 p9_free_req(clnt, req);
1667 return count;
1668
1669 free_and_error:
1670 p9_free_req(clnt, req);
1671 error:
1672 return err;
1673 }
1674 EXPORT_SYMBOL(p9_client_write);
1675
1676 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1677 {
1678 int err;
1679 struct p9_client *clnt;
1680 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1681 struct p9_req_t *req;
1682 u16 ignored;
1683
1684 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1685
1686 if (!ret)
1687 return ERR_PTR(-ENOMEM);
1688
1689 err = 0;
1690 clnt = fid->clnt;
1691
1692 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1693 if (IS_ERR(req)) {
1694 err = PTR_ERR(req);
1695 goto error;
1696 }
1697
1698 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1699 if (err) {
1700 trace_9p_protocol_dump(clnt, req->rc);
1701 p9_free_req(clnt, req);
1702 goto error;
1703 }
1704
1705 p9_debug(P9_DEBUG_9P,
1706 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1707 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1708 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1709 "<<< uid=%d gid=%d n_muid=%d\n",
1710 ret->size, ret->type, ret->dev, ret->qid.type,
1711 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1712 ret->atime, ret->mtime, (unsigned long long)ret->length,
1713 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1714 from_kuid(&init_user_ns, ret->n_uid),
1715 from_kgid(&init_user_ns, ret->n_gid),
1716 from_kuid(&init_user_ns, ret->n_muid));
1717
1718 p9_free_req(clnt, req);
1719 return ret;
1720
1721 error:
1722 kfree(ret);
1723 return ERR_PTR(err);
1724 }
1725 EXPORT_SYMBOL(p9_client_stat);
1726
1727 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1728 u64 request_mask)
1729 {
1730 int err;
1731 struct p9_client *clnt;
1732 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1733 GFP_KERNEL);
1734 struct p9_req_t *req;
1735
1736 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1737 fid->fid, request_mask);
1738
1739 if (!ret)
1740 return ERR_PTR(-ENOMEM);
1741
1742 err = 0;
1743 clnt = fid->clnt;
1744
1745 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1746 if (IS_ERR(req)) {
1747 err = PTR_ERR(req);
1748 goto error;
1749 }
1750
1751 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1752 if (err) {
1753 trace_9p_protocol_dump(clnt, req->rc);
1754 p9_free_req(clnt, req);
1755 goto error;
1756 }
1757
1758 p9_debug(P9_DEBUG_9P,
1759 "<<< RGETATTR st_result_mask=%lld\n"
1760 "<<< qid=%x.%llx.%x\n"
1761 "<<< st_mode=%8.8x st_nlink=%llu\n"
1762 "<<< st_uid=%d st_gid=%d\n"
1763 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1764 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1765 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1766 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1767 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1768 "<<< st_gen=%lld st_data_version=%lld",
1769 ret->st_result_mask, ret->qid.type, ret->qid.path,
1770 ret->qid.version, ret->st_mode, ret->st_nlink,
1771 from_kuid(&init_user_ns, ret->st_uid),
1772 from_kgid(&init_user_ns, ret->st_gid),
1773 ret->st_rdev, ret->st_size, ret->st_blksize,
1774 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1775 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1776 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1777 ret->st_gen, ret->st_data_version);
1778
1779 p9_free_req(clnt, req);
1780 return ret;
1781
1782 error:
1783 kfree(ret);
1784 return ERR_PTR(err);
1785 }
1786 EXPORT_SYMBOL(p9_client_getattr_dotl);
1787
1788 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1789 {
1790 int ret;
1791
1792 /* NOTE: size shouldn't include its own length */
1793 /* size[2] type[2] dev[4] qid[13] */
1794 /* mode[4] atime[4] mtime[4] length[8]*/
1795 /* name[s] uid[s] gid[s] muid[s] */
1796 ret = 2+4+13+4+4+4+8+2+2+2+2;
1797
1798 if (wst->name)
1799 ret += strlen(wst->name);
1800 if (wst->uid)
1801 ret += strlen(wst->uid);
1802 if (wst->gid)
1803 ret += strlen(wst->gid);
1804 if (wst->muid)
1805 ret += strlen(wst->muid);
1806
1807 if ((proto_version == p9_proto_2000u) ||
1808 (proto_version == p9_proto_2000L)) {
1809 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1810 if (wst->extension)
1811 ret += strlen(wst->extension);
1812 }
1813
1814 return ret;
1815 }
1816
1817 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1818 {
1819 int err;
1820 struct p9_req_t *req;
1821 struct p9_client *clnt;
1822
1823 err = 0;
1824 clnt = fid->clnt;
1825 wst->size = p9_client_statsize(wst, clnt->proto_version);
1826 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1827 p9_debug(P9_DEBUG_9P,
1828 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1829 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1830 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1831 " uid=%d gid=%d n_muid=%d\n",
1832 wst->size, wst->type, wst->dev, wst->qid.type,
1833 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1834 wst->atime, wst->mtime, (unsigned long long)wst->length,
1835 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1836 from_kuid(&init_user_ns, wst->n_uid),
1837 from_kgid(&init_user_ns, wst->n_gid),
1838 from_kuid(&init_user_ns, wst->n_muid));
1839
1840 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1841 if (IS_ERR(req)) {
1842 err = PTR_ERR(req);
1843 goto error;
1844 }
1845
1846 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1847
1848 p9_free_req(clnt, req);
1849 error:
1850 return err;
1851 }
1852 EXPORT_SYMBOL(p9_client_wstat);
1853
1854 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1855 {
1856 int err;
1857 struct p9_req_t *req;
1858 struct p9_client *clnt;
1859
1860 err = 0;
1861 clnt = fid->clnt;
1862 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1863 p9_debug(P9_DEBUG_9P,
1864 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1865 " atime_sec=%lld atime_nsec=%lld\n"
1866 " mtime_sec=%lld mtime_nsec=%lld\n",
1867 p9attr->valid, p9attr->mode,
1868 from_kuid(&init_user_ns, p9attr->uid),
1869 from_kgid(&init_user_ns, p9attr->gid),
1870 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1871 p9attr->mtime_sec, p9attr->mtime_nsec);
1872
1873 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1874
1875 if (IS_ERR(req)) {
1876 err = PTR_ERR(req);
1877 goto error;
1878 }
1879 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1880 p9_free_req(clnt, req);
1881 error:
1882 return err;
1883 }
1884 EXPORT_SYMBOL(p9_client_setattr);
1885
1886 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1887 {
1888 int err;
1889 struct p9_req_t *req;
1890 struct p9_client *clnt;
1891
1892 err = 0;
1893 clnt = fid->clnt;
1894
1895 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1896
1897 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1898 if (IS_ERR(req)) {
1899 err = PTR_ERR(req);
1900 goto error;
1901 }
1902
1903 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1904 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1905 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1906 if (err) {
1907 trace_9p_protocol_dump(clnt, req->rc);
1908 p9_free_req(clnt, req);
1909 goto error;
1910 }
1911
1912 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1913 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1914 "fsid %llu namelen %ld\n",
1915 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1916 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1917 sb->fsid, (long int)sb->namelen);
1918
1919 p9_free_req(clnt, req);
1920 error:
1921 return err;
1922 }
1923 EXPORT_SYMBOL(p9_client_statfs);
1924
1925 int p9_client_rename(struct p9_fid *fid,
1926 struct p9_fid *newdirfid, const char *name)
1927 {
1928 int err;
1929 struct p9_req_t *req;
1930 struct p9_client *clnt;
1931
1932 err = 0;
1933 clnt = fid->clnt;
1934
1935 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1936 fid->fid, newdirfid->fid, name);
1937
1938 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1939 newdirfid->fid, name);
1940 if (IS_ERR(req)) {
1941 err = PTR_ERR(req);
1942 goto error;
1943 }
1944
1945 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1946
1947 p9_free_req(clnt, req);
1948 error:
1949 return err;
1950 }
1951 EXPORT_SYMBOL(p9_client_rename);
1952
1953 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1954 struct p9_fid *newdirfid, const char *new_name)
1955 {
1956 int err;
1957 struct p9_req_t *req;
1958 struct p9_client *clnt;
1959
1960 err = 0;
1961 clnt = olddirfid->clnt;
1962
1963 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1964 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1965 newdirfid->fid, new_name);
1966
1967 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1968 old_name, newdirfid->fid, new_name);
1969 if (IS_ERR(req)) {
1970 err = PTR_ERR(req);
1971 goto error;
1972 }
1973
1974 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1975 newdirfid->fid, new_name);
1976
1977 p9_free_req(clnt, req);
1978 error:
1979 return err;
1980 }
1981 EXPORT_SYMBOL(p9_client_renameat);
1982
1983 /*
1984 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1985 */
1986 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1987 const char *attr_name, u64 *attr_size)
1988 {
1989 int err;
1990 struct p9_req_t *req;
1991 struct p9_client *clnt;
1992 struct p9_fid *attr_fid;
1993
1994 err = 0;
1995 clnt = file_fid->clnt;
1996 attr_fid = p9_fid_create(clnt);
1997 if (IS_ERR(attr_fid)) {
1998 err = PTR_ERR(attr_fid);
1999 attr_fid = NULL;
2000 goto error;
2001 }
2002 p9_debug(P9_DEBUG_9P,
2003 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
2004 file_fid->fid, attr_fid->fid, attr_name);
2005
2006 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
2007 file_fid->fid, attr_fid->fid, attr_name);
2008 if (IS_ERR(req)) {
2009 err = PTR_ERR(req);
2010 goto error;
2011 }
2012 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
2013 if (err) {
2014 trace_9p_protocol_dump(clnt, req->rc);
2015 p9_free_req(clnt, req);
2016 goto clunk_fid;
2017 }
2018 p9_free_req(clnt, req);
2019 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2020 attr_fid->fid, *attr_size);
2021 return attr_fid;
2022 clunk_fid:
2023 p9_client_clunk(attr_fid);
2024 attr_fid = NULL;
2025 error:
2026 if (attr_fid && (attr_fid != file_fid))
2027 p9_fid_destroy(attr_fid);
2028
2029 return ERR_PTR(err);
2030 }
2031 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2032
2033 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2034 u64 attr_size, int flags)
2035 {
2036 int err;
2037 struct p9_req_t *req;
2038 struct p9_client *clnt;
2039
2040 p9_debug(P9_DEBUG_9P,
2041 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2042 fid->fid, name, (long long)attr_size, flags);
2043 err = 0;
2044 clnt = fid->clnt;
2045 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2046 fid->fid, name, attr_size, flags);
2047 if (IS_ERR(req)) {
2048 err = PTR_ERR(req);
2049 goto error;
2050 }
2051 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2052 p9_free_req(clnt, req);
2053 error:
2054 return err;
2055 }
2056 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2057
2058 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2059 {
2060 int err, rsize, non_zc = 0;
2061 struct p9_client *clnt;
2062 struct p9_req_t *req;
2063 char *dataptr;
2064
2065 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2066 fid->fid, (unsigned long long) offset, count);
2067
2068 err = 0;
2069 clnt = fid->clnt;
2070
2071 rsize = fid->iounit;
2072 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2073 rsize = clnt->msize - P9_READDIRHDRSZ;
2074
2075 if (count < rsize)
2076 rsize = count;
2077
2078 /* Don't bother zerocopy for small IO (< 1024) */
2079 if (clnt->trans_mod->zc_request && rsize > 1024) {
2080 /*
2081 * response header len is 11
2082 * PDU Header(7) + IO Size (4)
2083 */
2084 req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0,
2085 11, 1, "dqd", fid->fid, offset, rsize);
2086 } else {
2087 non_zc = 1;
2088 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2089 offset, rsize);
2090 }
2091 if (IS_ERR(req)) {
2092 err = PTR_ERR(req);
2093 goto error;
2094 }
2095
2096 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2097 if (err) {
2098 trace_9p_protocol_dump(clnt, req->rc);
2099 goto free_and_error;
2100 }
2101
2102 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2103
2104 if (non_zc)
2105 memmove(data, dataptr, count);
2106
2107 p9_free_req(clnt, req);
2108 return count;
2109
2110 free_and_error:
2111 p9_free_req(clnt, req);
2112 error:
2113 return err;
2114 }
2115 EXPORT_SYMBOL(p9_client_readdir);
2116
2117 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
2118 dev_t rdev, kgid_t gid, struct p9_qid *qid)
2119 {
2120 int err;
2121 struct p9_client *clnt;
2122 struct p9_req_t *req;
2123
2124 err = 0;
2125 clnt = fid->clnt;
2126 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2127 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2128 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2129 MAJOR(rdev), MINOR(rdev), gid);
2130 if (IS_ERR(req))
2131 return PTR_ERR(req);
2132
2133 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2134 if (err) {
2135 trace_9p_protocol_dump(clnt, req->rc);
2136 goto error;
2137 }
2138 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2139 (unsigned long long)qid->path, qid->version);
2140
2141 error:
2142 p9_free_req(clnt, req);
2143 return err;
2144
2145 }
2146 EXPORT_SYMBOL(p9_client_mknod_dotl);
2147
2148 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
2149 kgid_t gid, struct p9_qid *qid)
2150 {
2151 int err;
2152 struct p9_client *clnt;
2153 struct p9_req_t *req;
2154
2155 err = 0;
2156 clnt = fid->clnt;
2157 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2158 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2159 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
2160 gid);
2161 if (IS_ERR(req))
2162 return PTR_ERR(req);
2163
2164 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2165 if (err) {
2166 trace_9p_protocol_dump(clnt, req->rc);
2167 goto error;
2168 }
2169 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2170 (unsigned long long)qid->path, qid->version);
2171
2172 error:
2173 p9_free_req(clnt, req);
2174 return err;
2175
2176 }
2177 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2178
2179 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2180 {
2181 int err;
2182 struct p9_client *clnt;
2183 struct p9_req_t *req;
2184
2185 err = 0;
2186 clnt = fid->clnt;
2187 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2188 "start %lld length %lld proc_id %d client_id %s\n",
2189 fid->fid, flock->type, flock->flags, flock->start,
2190 flock->length, flock->proc_id, flock->client_id);
2191
2192 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2193 flock->flags, flock->start, flock->length,
2194 flock->proc_id, flock->client_id);
2195
2196 if (IS_ERR(req))
2197 return PTR_ERR(req);
2198
2199 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2200 if (err) {
2201 trace_9p_protocol_dump(clnt, req->rc);
2202 goto error;
2203 }
2204 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2205 error:
2206 p9_free_req(clnt, req);
2207 return err;
2208
2209 }
2210 EXPORT_SYMBOL(p9_client_lock_dotl);
2211
2212 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2213 {
2214 int err;
2215 struct p9_client *clnt;
2216 struct p9_req_t *req;
2217
2218 err = 0;
2219 clnt = fid->clnt;
2220 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2221 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2222 glock->start, glock->length, glock->proc_id, glock->client_id);
2223
2224 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2225 glock->start, glock->length, glock->proc_id, glock->client_id);
2226
2227 if (IS_ERR(req))
2228 return PTR_ERR(req);
2229
2230 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2231 &glock->start, &glock->length, &glock->proc_id,
2232 &glock->client_id);
2233 if (err) {
2234 trace_9p_protocol_dump(clnt, req->rc);
2235 goto error;
2236 }
2237 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2238 "proc_id %d client_id %s\n", glock->type, glock->start,
2239 glock->length, glock->proc_id, glock->client_id);
2240 error:
2241 p9_free_req(clnt, req);
2242 return err;
2243 }
2244 EXPORT_SYMBOL(p9_client_getlock_dotl);
2245
2246 int p9_client_readlink(struct p9_fid *fid, char **target)
2247 {
2248 int err;
2249 struct p9_client *clnt;
2250 struct p9_req_t *req;
2251
2252 err = 0;
2253 clnt = fid->clnt;
2254 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2255
2256 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2257 if (IS_ERR(req))
2258 return PTR_ERR(req);
2259
2260 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2261 if (err) {
2262 trace_9p_protocol_dump(clnt, req->rc);
2263 goto error;
2264 }
2265 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2266 error:
2267 p9_free_req(clnt, req);
2268 return err;
2269 }
2270 EXPORT_SYMBOL(p9_client_readlink);
Linus' kernel tree