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Merge branch 'pci/resource' into next
[deliverable/linux.git] / net / 9p / client.c
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
662 */
663 if (oldreq->status == REQ_STATUS_FLSH) {
664 spin_lock(&c->lock);
665 list_del(&oldreq->req_list);
666 spin_unlock(&c->lock);
667 }
668
669 p9_free_req(c, req);
670 return 0;
671 }
672
673 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
674 int8_t type, int req_size,
675 const char *fmt, va_list ap)
676 {
677 int tag, err;
678 struct p9_req_t *req;
679
680 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
681
682 /* we allow for any status other than disconnected */
683 if (c->status == Disconnected)
684 return ERR_PTR(-EIO);
685
686 /* if status is begin_disconnected we allow only clunk request */
687 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
688 return ERR_PTR(-EIO);
689
690 tag = P9_NOTAG;
691 if (type != P9_TVERSION) {
692 tag = p9_idpool_get(c->tagpool);
693 if (tag < 0)
694 return ERR_PTR(-ENOMEM);
695 }
696
697 req = p9_tag_alloc(c, tag, req_size);
698 if (IS_ERR(req))
699 return req;
700
701 /* marshall the data */
702 p9pdu_prepare(req->tc, tag, type);
703 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
704 if (err)
705 goto reterr;
706 p9pdu_finalize(c, req->tc);
707 trace_9p_client_req(c, type, tag);
708 return req;
709 reterr:
710 p9_free_req(c, req);
711 return ERR_PTR(err);
712 }
713
714 /**
715 * p9_client_rpc - issue a request and wait for a response
716 * @c: client session
717 * @type: type of request
718 * @fmt: protocol format string (see protocol.c)
719 *
720 * Returns request structure (which client must free using p9_free_req)
721 */
722
723 static struct p9_req_t *
724 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
725 {
726 va_list ap;
727 int sigpending, err;
728 unsigned long flags;
729 struct p9_req_t *req;
730
731 va_start(ap, fmt);
732 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
733 va_end(ap);
734 if (IS_ERR(req))
735 return req;
736
737 if (signal_pending(current)) {
738 sigpending = 1;
739 clear_thread_flag(TIF_SIGPENDING);
740 } else
741 sigpending = 0;
742
743 err = c->trans_mod->request(c, req);
744 if (err < 0) {
745 if (err != -ERESTARTSYS && err != -EFAULT)
746 c->status = Disconnected;
747 goto reterr;
748 }
749 again:
750 /* Wait for the response */
751 err = wait_event_interruptible(*req->wq,
752 req->status >= REQ_STATUS_RCVD);
753
754 if ((err == -ERESTARTSYS) && (c->status == Connected)
755 && (type == P9_TFLUSH)) {
756 sigpending = 1;
757 clear_thread_flag(TIF_SIGPENDING);
758 goto again;
759 }
760
761 if (req->status == REQ_STATUS_ERROR) {
762 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
763 err = req->t_err;
764 }
765 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
766 p9_debug(P9_DEBUG_MUX, "flushing\n");
767 sigpending = 1;
768 clear_thread_flag(TIF_SIGPENDING);
769
770 if (c->trans_mod->cancel(c, req))
771 p9_client_flush(c, req);
772
773 /* if we received the response anyway, don't signal error */
774 if (req->status == REQ_STATUS_RCVD)
775 err = 0;
776 }
777 if (sigpending) {
778 spin_lock_irqsave(&current->sighand->siglock, flags);
779 recalc_sigpending();
780 spin_unlock_irqrestore(&current->sighand->siglock, flags);
781 }
782 if (err < 0)
783 goto reterr;
784
785 err = p9_check_errors(c, req);
786 trace_9p_client_res(c, type, req->rc->tag, err);
787 if (!err)
788 return req;
789 reterr:
790 p9_free_req(c, req);
791 return ERR_PTR(safe_errno(err));
792 }
793
794 /**
795 * p9_client_zc_rpc - issue a request and wait for a response
796 * @c: client session
797 * @type: type of request
798 * @uidata: user bffer that should be ued for zero copy read
799 * @uodata: user buffer that shoud be user for zero copy write
800 * @inlen: read buffer size
801 * @olen: write buffer size
802 * @hdrlen: reader header size, This is the size of response protocol data
803 * @fmt: protocol format string (see protocol.c)
804 *
805 * Returns request structure (which client must free using p9_free_req)
806 */
807 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
808 char *uidata, char *uodata,
809 int inlen, int olen, int in_hdrlen,
810 int kern_buf, const char *fmt, ...)
811 {
812 va_list ap;
813 int sigpending, err;
814 unsigned long flags;
815 struct p9_req_t *req;
816
817 va_start(ap, fmt);
818 /*
819 * We allocate a inline protocol data of only 4k bytes.
820 * The actual content is passed in zero-copy fashion.
821 */
822 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
823 va_end(ap);
824 if (IS_ERR(req))
825 return req;
826
827 if (signal_pending(current)) {
828 sigpending = 1;
829 clear_thread_flag(TIF_SIGPENDING);
830 } else
831 sigpending = 0;
832
833 /* If we are called with KERNEL_DS force kern_buf */
834 if (segment_eq(get_fs(), KERNEL_DS))
835 kern_buf = 1;
836
837 err = c->trans_mod->zc_request(c, req, uidata, uodata,
838 inlen, olen, in_hdrlen, kern_buf);
839 if (err < 0) {
840 if (err == -EIO)
841 c->status = Disconnected;
842 goto reterr;
843 }
844 if (req->status == REQ_STATUS_ERROR) {
845 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
846 err = req->t_err;
847 }
848 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
849 p9_debug(P9_DEBUG_MUX, "flushing\n");
850 sigpending = 1;
851 clear_thread_flag(TIF_SIGPENDING);
852
853 if (c->trans_mod->cancel(c, req))
854 p9_client_flush(c, req);
855
856 /* if we received the response anyway, don't signal error */
857 if (req->status == REQ_STATUS_RCVD)
858 err = 0;
859 }
860 if (sigpending) {
861 spin_lock_irqsave(&current->sighand->siglock, flags);
862 recalc_sigpending();
863 spin_unlock_irqrestore(&current->sighand->siglock, flags);
864 }
865 if (err < 0)
866 goto reterr;
867
868 err = p9_check_zc_errors(c, req, uidata, in_hdrlen, kern_buf);
869 trace_9p_client_res(c, type, req->rc->tag, err);
870 if (!err)
871 return req;
872 reterr:
873 p9_free_req(c, req);
874 return ERR_PTR(safe_errno(err));
875 }
876
877 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
878 {
879 int ret;
880 struct p9_fid *fid;
881 unsigned long flags;
882
883 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
884 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
885 if (!fid)
886 return ERR_PTR(-ENOMEM);
887
888 ret = p9_idpool_get(clnt->fidpool);
889 if (ret < 0) {
890 ret = -ENOSPC;
891 goto error;
892 }
893 fid->fid = ret;
894
895 memset(&fid->qid, 0, sizeof(struct p9_qid));
896 fid->mode = -1;
897 fid->uid = current_fsuid();
898 fid->clnt = clnt;
899 fid->rdir = NULL;
900 spin_lock_irqsave(&clnt->lock, flags);
901 list_add(&fid->flist, &clnt->fidlist);
902 spin_unlock_irqrestore(&clnt->lock, flags);
903
904 return fid;
905
906 error:
907 kfree(fid);
908 return ERR_PTR(ret);
909 }
910
911 static void p9_fid_destroy(struct p9_fid *fid)
912 {
913 struct p9_client *clnt;
914 unsigned long flags;
915
916 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
917 clnt = fid->clnt;
918 p9_idpool_put(fid->fid, clnt->fidpool);
919 spin_lock_irqsave(&clnt->lock, flags);
920 list_del(&fid->flist);
921 spin_unlock_irqrestore(&clnt->lock, flags);
922 kfree(fid->rdir);
923 kfree(fid);
924 }
925
926 static int p9_client_version(struct p9_client *c)
927 {
928 int err = 0;
929 struct p9_req_t *req;
930 char *version;
931 int msize;
932
933 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
934 c->msize, c->proto_version);
935
936 switch (c->proto_version) {
937 case p9_proto_2000L:
938 req = p9_client_rpc(c, P9_TVERSION, "ds",
939 c->msize, "9P2000.L");
940 break;
941 case p9_proto_2000u:
942 req = p9_client_rpc(c, P9_TVERSION, "ds",
943 c->msize, "9P2000.u");
944 break;
945 case p9_proto_legacy:
946 req = p9_client_rpc(c, P9_TVERSION, "ds",
947 c->msize, "9P2000");
948 break;
949 default:
950 return -EINVAL;
951 break;
952 }
953
954 if (IS_ERR(req))
955 return PTR_ERR(req);
956
957 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
958 if (err) {
959 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
960 trace_9p_protocol_dump(c, req->rc);
961 goto error;
962 }
963
964 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
965 if (!strncmp(version, "9P2000.L", 8))
966 c->proto_version = p9_proto_2000L;
967 else if (!strncmp(version, "9P2000.u", 8))
968 c->proto_version = p9_proto_2000u;
969 else if (!strncmp(version, "9P2000", 6))
970 c->proto_version = p9_proto_legacy;
971 else {
972 err = -EREMOTEIO;
973 goto error;
974 }
975
976 if (msize < c->msize)
977 c->msize = msize;
978
979 error:
980 kfree(version);
981 p9_free_req(c, req);
982
983 return err;
984 }
985
986 struct p9_client *p9_client_create(const char *dev_name, char *options)
987 {
988 int err;
989 struct p9_client *clnt;
990 char *client_id;
991
992 err = 0;
993 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
994 if (!clnt)
995 return ERR_PTR(-ENOMEM);
996
997 clnt->trans_mod = NULL;
998 clnt->trans = NULL;
999
1000 client_id = utsname()->nodename;
1001 memcpy(clnt->name, client_id, strlen(client_id) + 1);
1002
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_default_trans();
1016
1017 if (clnt->trans_mod == NULL) {
1018 err = -EPROTONOSUPPORT;
1019 p9_debug(P9_DEBUG_ERROR,
1020 "No transport defined or default transport\n");
1021 goto destroy_tagpool;
1022 }
1023
1024 clnt->fidpool = p9_idpool_create();
1025 if (IS_ERR(clnt->fidpool)) {
1026 err = PTR_ERR(clnt->fidpool);
1027 goto put_trans;
1028 }
1029
1030 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1031 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1032
1033 err = clnt->trans_mod->create(clnt, dev_name, options);
1034 if (err)
1035 goto destroy_fidpool;
1036
1037 if (clnt->msize > clnt->trans_mod->maxsize)
1038 clnt->msize = clnt->trans_mod->maxsize;
1039
1040 err = p9_client_version(clnt);
1041 if (err)
1042 goto close_trans;
1043
1044 return clnt;
1045
1046 close_trans:
1047 clnt->trans_mod->close(clnt);
1048 destroy_fidpool:
1049 p9_idpool_destroy(clnt->fidpool);
1050 put_trans:
1051 v9fs_put_trans(clnt->trans_mod);
1052 destroy_tagpool:
1053 p9_idpool_destroy(clnt->tagpool);
1054 free_client:
1055 kfree(clnt);
1056 return ERR_PTR(err);
1057 }
1058 EXPORT_SYMBOL(p9_client_create);
1059
1060 void p9_client_destroy(struct p9_client *clnt)
1061 {
1062 struct p9_fid *fid, *fidptr;
1063
1064 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1065
1066 if (clnt->trans_mod)
1067 clnt->trans_mod->close(clnt);
1068
1069 v9fs_put_trans(clnt->trans_mod);
1070
1071 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
1072 pr_info("Found fid %d not clunked\n", fid->fid);
1073 p9_fid_destroy(fid);
1074 }
1075
1076 if (clnt->fidpool)
1077 p9_idpool_destroy(clnt->fidpool);
1078
1079 p9_tag_cleanup(clnt);
1080
1081 kfree(clnt);
1082 }
1083 EXPORT_SYMBOL(p9_client_destroy);
1084
1085 void p9_client_disconnect(struct p9_client *clnt)
1086 {
1087 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1088 clnt->status = Disconnected;
1089 }
1090 EXPORT_SYMBOL(p9_client_disconnect);
1091
1092 void p9_client_begin_disconnect(struct p9_client *clnt)
1093 {
1094 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1095 clnt->status = BeginDisconnect;
1096 }
1097 EXPORT_SYMBOL(p9_client_begin_disconnect);
1098
1099 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1100 char *uname, kuid_t n_uname, char *aname)
1101 {
1102 int err = 0;
1103 struct p9_req_t *req;
1104 struct p9_fid *fid;
1105 struct p9_qid qid;
1106
1107
1108 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1109 afid ? afid->fid : -1, uname, aname);
1110 fid = p9_fid_create(clnt);
1111 if (IS_ERR(fid)) {
1112 err = PTR_ERR(fid);
1113 fid = NULL;
1114 goto error;
1115 }
1116
1117 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1118 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1119 if (IS_ERR(req)) {
1120 err = PTR_ERR(req);
1121 goto error;
1122 }
1123
1124 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
1125 if (err) {
1126 trace_9p_protocol_dump(clnt, req->rc);
1127 p9_free_req(clnt, req);
1128 goto error;
1129 }
1130
1131 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1132 qid.type, (unsigned long long)qid.path, qid.version);
1133
1134 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1135
1136 p9_free_req(clnt, req);
1137 return fid;
1138
1139 error:
1140 if (fid)
1141 p9_fid_destroy(fid);
1142 return ERR_PTR(err);
1143 }
1144 EXPORT_SYMBOL(p9_client_attach);
1145
1146 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1147 char **wnames, int clone)
1148 {
1149 int err;
1150 struct p9_client *clnt;
1151 struct p9_fid *fid;
1152 struct p9_qid *wqids;
1153 struct p9_req_t *req;
1154 uint16_t nwqids, count;
1155
1156 err = 0;
1157 wqids = NULL;
1158 clnt = oldfid->clnt;
1159 if (clone) {
1160 fid = p9_fid_create(clnt);
1161 if (IS_ERR(fid)) {
1162 err = PTR_ERR(fid);
1163 fid = NULL;
1164 goto error;
1165 }
1166
1167 fid->uid = oldfid->uid;
1168 } else
1169 fid = oldfid;
1170
1171
1172 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1173 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1174
1175 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1176 nwname, wnames);
1177 if (IS_ERR(req)) {
1178 err = PTR_ERR(req);
1179 goto error;
1180 }
1181
1182 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1183 if (err) {
1184 trace_9p_protocol_dump(clnt, req->rc);
1185 p9_free_req(clnt, req);
1186 goto clunk_fid;
1187 }
1188 p9_free_req(clnt, req);
1189
1190 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1191
1192 if (nwqids != nwname) {
1193 err = -ENOENT;
1194 goto clunk_fid;
1195 }
1196
1197 for (count = 0; count < nwqids; count++)
1198 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1199 count, wqids[count].type,
1200 (unsigned long long)wqids[count].path,
1201 wqids[count].version);
1202
1203 if (nwname)
1204 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1205 else
1206 fid->qid = oldfid->qid;
1207
1208 kfree(wqids);
1209 return fid;
1210
1211 clunk_fid:
1212 kfree(wqids);
1213 p9_client_clunk(fid);
1214 fid = NULL;
1215
1216 error:
1217 if (fid && (fid != oldfid))
1218 p9_fid_destroy(fid);
1219
1220 return ERR_PTR(err);
1221 }
1222 EXPORT_SYMBOL(p9_client_walk);
1223
1224 int p9_client_open(struct p9_fid *fid, int mode)
1225 {
1226 int err;
1227 struct p9_client *clnt;
1228 struct p9_req_t *req;
1229 struct p9_qid qid;
1230 int iounit;
1231
1232 clnt = fid->clnt;
1233 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1234 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1235 err = 0;
1236
1237 if (fid->mode != -1)
1238 return -EINVAL;
1239
1240 if (p9_is_proto_dotl(clnt))
1241 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1242 else
1243 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1244 if (IS_ERR(req)) {
1245 err = PTR_ERR(req);
1246 goto error;
1247 }
1248
1249 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1250 if (err) {
1251 trace_9p_protocol_dump(clnt, req->rc);
1252 goto free_and_error;
1253 }
1254
1255 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1256 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1257 (unsigned long long)qid.path, qid.version, iounit);
1258
1259 fid->mode = mode;
1260 fid->iounit = iounit;
1261
1262 free_and_error:
1263 p9_free_req(clnt, req);
1264 error:
1265 return err;
1266 }
1267 EXPORT_SYMBOL(p9_client_open);
1268
1269 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1270 kgid_t gid, struct p9_qid *qid)
1271 {
1272 int err = 0;
1273 struct p9_client *clnt;
1274 struct p9_req_t *req;
1275 int iounit;
1276
1277 p9_debug(P9_DEBUG_9P,
1278 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1279 ofid->fid, name, flags, mode,
1280 from_kgid(&init_user_ns, gid));
1281 clnt = ofid->clnt;
1282
1283 if (ofid->mode != -1)
1284 return -EINVAL;
1285
1286 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1287 mode, gid);
1288 if (IS_ERR(req)) {
1289 err = PTR_ERR(req);
1290 goto error;
1291 }
1292
1293 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1294 if (err) {
1295 trace_9p_protocol_dump(clnt, req->rc);
1296 goto free_and_error;
1297 }
1298
1299 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1300 qid->type,
1301 (unsigned long long)qid->path,
1302 qid->version, iounit);
1303
1304 ofid->mode = mode;
1305 ofid->iounit = iounit;
1306
1307 free_and_error:
1308 p9_free_req(clnt, req);
1309 error:
1310 return err;
1311 }
1312 EXPORT_SYMBOL(p9_client_create_dotl);
1313
1314 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1315 char *extension)
1316 {
1317 int err;
1318 struct p9_client *clnt;
1319 struct p9_req_t *req;
1320 struct p9_qid qid;
1321 int iounit;
1322
1323 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1324 fid->fid, name, perm, mode);
1325 err = 0;
1326 clnt = fid->clnt;
1327
1328 if (fid->mode != -1)
1329 return -EINVAL;
1330
1331 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1332 mode, extension);
1333 if (IS_ERR(req)) {
1334 err = PTR_ERR(req);
1335 goto error;
1336 }
1337
1338 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1339 if (err) {
1340 trace_9p_protocol_dump(clnt, req->rc);
1341 goto free_and_error;
1342 }
1343
1344 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1345 qid.type,
1346 (unsigned long long)qid.path,
1347 qid.version, iounit);
1348
1349 fid->mode = mode;
1350 fid->iounit = iounit;
1351
1352 free_and_error:
1353 p9_free_req(clnt, req);
1354 error:
1355 return err;
1356 }
1357 EXPORT_SYMBOL(p9_client_fcreate);
1358
1359 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, kgid_t gid,
1360 struct p9_qid *qid)
1361 {
1362 int err = 0;
1363 struct p9_client *clnt;
1364 struct p9_req_t *req;
1365
1366 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1367 dfid->fid, name, symtgt);
1368 clnt = dfid->clnt;
1369
1370 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1371 gid);
1372 if (IS_ERR(req)) {
1373 err = PTR_ERR(req);
1374 goto error;
1375 }
1376
1377 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1378 if (err) {
1379 trace_9p_protocol_dump(clnt, req->rc);
1380 goto free_and_error;
1381 }
1382
1383 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1384 qid->type, (unsigned long long)qid->path, qid->version);
1385
1386 free_and_error:
1387 p9_free_req(clnt, req);
1388 error:
1389 return err;
1390 }
1391 EXPORT_SYMBOL(p9_client_symlink);
1392
1393 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1394 {
1395 struct p9_client *clnt;
1396 struct p9_req_t *req;
1397
1398 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1399 dfid->fid, oldfid->fid, newname);
1400 clnt = dfid->clnt;
1401 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1402 newname);
1403 if (IS_ERR(req))
1404 return PTR_ERR(req);
1405
1406 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1407 p9_free_req(clnt, req);
1408 return 0;
1409 }
1410 EXPORT_SYMBOL(p9_client_link);
1411
1412 int p9_client_fsync(struct p9_fid *fid, int datasync)
1413 {
1414 int err;
1415 struct p9_client *clnt;
1416 struct p9_req_t *req;
1417
1418 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1419 fid->fid, datasync);
1420 err = 0;
1421 clnt = fid->clnt;
1422
1423 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1424 if (IS_ERR(req)) {
1425 err = PTR_ERR(req);
1426 goto error;
1427 }
1428
1429 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1430
1431 p9_free_req(clnt, req);
1432
1433 error:
1434 return err;
1435 }
1436 EXPORT_SYMBOL(p9_client_fsync);
1437
1438 int p9_client_clunk(struct p9_fid *fid)
1439 {
1440 int err;
1441 struct p9_client *clnt;
1442 struct p9_req_t *req;
1443 int retries = 0;
1444
1445 if (!fid) {
1446 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1447 __func__, task_pid_nr(current));
1448 dump_stack();
1449 return 0;
1450 }
1451
1452 again:
1453 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1454 retries);
1455 err = 0;
1456 clnt = fid->clnt;
1457
1458 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1459 if (IS_ERR(req)) {
1460 err = PTR_ERR(req);
1461 goto error;
1462 }
1463
1464 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1465
1466 p9_free_req(clnt, req);
1467 error:
1468 /*
1469 * Fid is not valid even after a failed clunk
1470 * If interrupted, retry once then give up and
1471 * leak fid until umount.
1472 */
1473 if (err == -ERESTARTSYS) {
1474 if (retries++ == 0)
1475 goto again;
1476 } else
1477 p9_fid_destroy(fid);
1478 return err;
1479 }
1480 EXPORT_SYMBOL(p9_client_clunk);
1481
1482 int p9_client_remove(struct p9_fid *fid)
1483 {
1484 int err;
1485 struct p9_client *clnt;
1486 struct p9_req_t *req;
1487
1488 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1489 err = 0;
1490 clnt = fid->clnt;
1491
1492 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1493 if (IS_ERR(req)) {
1494 err = PTR_ERR(req);
1495 goto error;
1496 }
1497
1498 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1499
1500 p9_free_req(clnt, req);
1501 error:
1502 if (err == -ERESTARTSYS)
1503 p9_client_clunk(fid);
1504 else
1505 p9_fid_destroy(fid);
1506 return err;
1507 }
1508 EXPORT_SYMBOL(p9_client_remove);
1509
1510 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1511 {
1512 int err = 0;
1513 struct p9_req_t *req;
1514 struct p9_client *clnt;
1515
1516 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1517 dfid->fid, name, flags);
1518
1519 clnt = dfid->clnt;
1520 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1521 if (IS_ERR(req)) {
1522 err = PTR_ERR(req);
1523 goto error;
1524 }
1525 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1526
1527 p9_free_req(clnt, req);
1528 error:
1529 return err;
1530 }
1531 EXPORT_SYMBOL(p9_client_unlinkat);
1532
1533 int
1534 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1535 u32 count)
1536 {
1537 char *dataptr;
1538 int kernel_buf = 0;
1539 struct p9_req_t *req;
1540 struct p9_client *clnt;
1541 int err, rsize, non_zc = 0;
1542
1543
1544 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1545 fid->fid, (unsigned long long) offset, count);
1546 err = 0;
1547 clnt = fid->clnt;
1548
1549 rsize = fid->iounit;
1550 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1551 rsize = clnt->msize - P9_IOHDRSZ;
1552
1553 if (count < rsize)
1554 rsize = count;
1555
1556 /* Don't bother zerocopy for small IO (< 1024) */
1557 if (clnt->trans_mod->zc_request && rsize > 1024) {
1558 char *indata;
1559 if (data) {
1560 kernel_buf = 1;
1561 indata = data;
1562 } else
1563 indata = (__force char *)udata;
1564 /*
1565 * response header len is 11
1566 * PDU Header(7) + IO Size (4)
1567 */
1568 req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0,
1569 11, kernel_buf, "dqd", fid->fid,
1570 offset, rsize);
1571 } else {
1572 non_zc = 1;
1573 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1574 rsize);
1575 }
1576 if (IS_ERR(req)) {
1577 err = PTR_ERR(req);
1578 goto error;
1579 }
1580
1581 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1582 if (err) {
1583 trace_9p_protocol_dump(clnt, req->rc);
1584 goto free_and_error;
1585 }
1586
1587 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1588
1589 if (non_zc) {
1590 if (data) {
1591 memmove(data, dataptr, count);
1592 } else {
1593 err = copy_to_user(udata, dataptr, count);
1594 if (err) {
1595 err = -EFAULT;
1596 goto free_and_error;
1597 }
1598 }
1599 }
1600 p9_free_req(clnt, req);
1601 return count;
1602
1603 free_and_error:
1604 p9_free_req(clnt, req);
1605 error:
1606 return err;
1607 }
1608 EXPORT_SYMBOL(p9_client_read);
1609
1610 int
1611 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1612 u64 offset, u32 count)
1613 {
1614 int err, rsize;
1615 int kernel_buf = 0;
1616 struct p9_client *clnt;
1617 struct p9_req_t *req;
1618
1619 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1620 fid->fid, (unsigned long long) offset, count);
1621 err = 0;
1622 clnt = fid->clnt;
1623
1624 rsize = fid->iounit;
1625 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1626 rsize = clnt->msize - P9_IOHDRSZ;
1627
1628 if (count < rsize)
1629 rsize = count;
1630
1631 /* Don't bother zerocopy for small IO (< 1024) */
1632 if (clnt->trans_mod->zc_request && rsize > 1024) {
1633 char *odata;
1634 if (data) {
1635 kernel_buf = 1;
1636 odata = data;
1637 } else
1638 odata = (char *)udata;
1639 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize,
1640 P9_ZC_HDR_SZ, kernel_buf, "dqd",
1641 fid->fid, offset, rsize);
1642 } else {
1643 if (data)
1644 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
1645 offset, rsize, data);
1646 else
1647 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
1648 offset, rsize, udata);
1649 }
1650 if (IS_ERR(req)) {
1651 err = PTR_ERR(req);
1652 goto error;
1653 }
1654
1655 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1656 if (err) {
1657 trace_9p_protocol_dump(clnt, req->rc);
1658 goto free_and_error;
1659 }
1660
1661 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1662
1663 p9_free_req(clnt, req);
1664 return count;
1665
1666 free_and_error:
1667 p9_free_req(clnt, req);
1668 error:
1669 return err;
1670 }
1671 EXPORT_SYMBOL(p9_client_write);
1672
1673 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1674 {
1675 int err;
1676 struct p9_client *clnt;
1677 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1678 struct p9_req_t *req;
1679 u16 ignored;
1680
1681 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1682
1683 if (!ret)
1684 return ERR_PTR(-ENOMEM);
1685
1686 err = 0;
1687 clnt = fid->clnt;
1688
1689 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1690 if (IS_ERR(req)) {
1691 err = PTR_ERR(req);
1692 goto error;
1693 }
1694
1695 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1696 if (err) {
1697 trace_9p_protocol_dump(clnt, req->rc);
1698 p9_free_req(clnt, req);
1699 goto error;
1700 }
1701
1702 p9_debug(P9_DEBUG_9P,
1703 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1704 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1705 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1706 "<<< uid=%d gid=%d n_muid=%d\n",
1707 ret->size, ret->type, ret->dev, ret->qid.type,
1708 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1709 ret->atime, ret->mtime, (unsigned long long)ret->length,
1710 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1711 from_kuid(&init_user_ns, ret->n_uid),
1712 from_kgid(&init_user_ns, ret->n_gid),
1713 from_kuid(&init_user_ns, ret->n_muid));
1714
1715 p9_free_req(clnt, req);
1716 return ret;
1717
1718 error:
1719 kfree(ret);
1720 return ERR_PTR(err);
1721 }
1722 EXPORT_SYMBOL(p9_client_stat);
1723
1724 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1725 u64 request_mask)
1726 {
1727 int err;
1728 struct p9_client *clnt;
1729 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1730 GFP_KERNEL);
1731 struct p9_req_t *req;
1732
1733 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1734 fid->fid, request_mask);
1735
1736 if (!ret)
1737 return ERR_PTR(-ENOMEM);
1738
1739 err = 0;
1740 clnt = fid->clnt;
1741
1742 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1743 if (IS_ERR(req)) {
1744 err = PTR_ERR(req);
1745 goto error;
1746 }
1747
1748 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1749 if (err) {
1750 trace_9p_protocol_dump(clnt, req->rc);
1751 p9_free_req(clnt, req);
1752 goto error;
1753 }
1754
1755 p9_debug(P9_DEBUG_9P,
1756 "<<< RGETATTR st_result_mask=%lld\n"
1757 "<<< qid=%x.%llx.%x\n"
1758 "<<< st_mode=%8.8x st_nlink=%llu\n"
1759 "<<< st_uid=%d st_gid=%d\n"
1760 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1761 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1762 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1763 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1764 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1765 "<<< st_gen=%lld st_data_version=%lld",
1766 ret->st_result_mask, ret->qid.type, ret->qid.path,
1767 ret->qid.version, ret->st_mode, ret->st_nlink,
1768 from_kuid(&init_user_ns, ret->st_uid),
1769 from_kgid(&init_user_ns, ret->st_gid),
1770 ret->st_rdev, ret->st_size, ret->st_blksize,
1771 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1772 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1773 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1774 ret->st_gen, ret->st_data_version);
1775
1776 p9_free_req(clnt, req);
1777 return ret;
1778
1779 error:
1780 kfree(ret);
1781 return ERR_PTR(err);
1782 }
1783 EXPORT_SYMBOL(p9_client_getattr_dotl);
1784
1785 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1786 {
1787 int ret;
1788
1789 /* NOTE: size shouldn't include its own length */
1790 /* size[2] type[2] dev[4] qid[13] */
1791 /* mode[4] atime[4] mtime[4] length[8]*/
1792 /* name[s] uid[s] gid[s] muid[s] */
1793 ret = 2+4+13+4+4+4+8+2+2+2+2;
1794
1795 if (wst->name)
1796 ret += strlen(wst->name);
1797 if (wst->uid)
1798 ret += strlen(wst->uid);
1799 if (wst->gid)
1800 ret += strlen(wst->gid);
1801 if (wst->muid)
1802 ret += strlen(wst->muid);
1803
1804 if ((proto_version == p9_proto_2000u) ||
1805 (proto_version == p9_proto_2000L)) {
1806 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1807 if (wst->extension)
1808 ret += strlen(wst->extension);
1809 }
1810
1811 return ret;
1812 }
1813
1814 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1815 {
1816 int err;
1817 struct p9_req_t *req;
1818 struct p9_client *clnt;
1819
1820 err = 0;
1821 clnt = fid->clnt;
1822 wst->size = p9_client_statsize(wst, clnt->proto_version);
1823 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1824 p9_debug(P9_DEBUG_9P,
1825 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1826 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1827 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1828 " uid=%d gid=%d n_muid=%d\n",
1829 wst->size, wst->type, wst->dev, wst->qid.type,
1830 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1831 wst->atime, wst->mtime, (unsigned long long)wst->length,
1832 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1833 from_kuid(&init_user_ns, wst->n_uid),
1834 from_kgid(&init_user_ns, wst->n_gid),
1835 from_kuid(&init_user_ns, wst->n_muid));
1836
1837 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1838 if (IS_ERR(req)) {
1839 err = PTR_ERR(req);
1840 goto error;
1841 }
1842
1843 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1844
1845 p9_free_req(clnt, req);
1846 error:
1847 return err;
1848 }
1849 EXPORT_SYMBOL(p9_client_wstat);
1850
1851 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1852 {
1853 int err;
1854 struct p9_req_t *req;
1855 struct p9_client *clnt;
1856
1857 err = 0;
1858 clnt = fid->clnt;
1859 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1860 p9_debug(P9_DEBUG_9P,
1861 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1862 " atime_sec=%lld atime_nsec=%lld\n"
1863 " mtime_sec=%lld mtime_nsec=%lld\n",
1864 p9attr->valid, p9attr->mode,
1865 from_kuid(&init_user_ns, p9attr->uid),
1866 from_kgid(&init_user_ns, p9attr->gid),
1867 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1868 p9attr->mtime_sec, p9attr->mtime_nsec);
1869
1870 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1871
1872 if (IS_ERR(req)) {
1873 err = PTR_ERR(req);
1874 goto error;
1875 }
1876 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1877 p9_free_req(clnt, req);
1878 error:
1879 return err;
1880 }
1881 EXPORT_SYMBOL(p9_client_setattr);
1882
1883 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1884 {
1885 int err;
1886 struct p9_req_t *req;
1887 struct p9_client *clnt;
1888
1889 err = 0;
1890 clnt = fid->clnt;
1891
1892 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1893
1894 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1895 if (IS_ERR(req)) {
1896 err = PTR_ERR(req);
1897 goto error;
1898 }
1899
1900 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1901 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1902 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1903 if (err) {
1904 trace_9p_protocol_dump(clnt, req->rc);
1905 p9_free_req(clnt, req);
1906 goto error;
1907 }
1908
1909 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1910 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1911 "fsid %llu namelen %ld\n",
1912 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1913 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1914 sb->fsid, (long int)sb->namelen);
1915
1916 p9_free_req(clnt, req);
1917 error:
1918 return err;
1919 }
1920 EXPORT_SYMBOL(p9_client_statfs);
1921
1922 int p9_client_rename(struct p9_fid *fid,
1923 struct p9_fid *newdirfid, const char *name)
1924 {
1925 int err;
1926 struct p9_req_t *req;
1927 struct p9_client *clnt;
1928
1929 err = 0;
1930 clnt = fid->clnt;
1931
1932 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1933 fid->fid, newdirfid->fid, name);
1934
1935 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1936 newdirfid->fid, name);
1937 if (IS_ERR(req)) {
1938 err = PTR_ERR(req);
1939 goto error;
1940 }
1941
1942 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1943
1944 p9_free_req(clnt, req);
1945 error:
1946 return err;
1947 }
1948 EXPORT_SYMBOL(p9_client_rename);
1949
1950 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1951 struct p9_fid *newdirfid, const char *new_name)
1952 {
1953 int err;
1954 struct p9_req_t *req;
1955 struct p9_client *clnt;
1956
1957 err = 0;
1958 clnt = olddirfid->clnt;
1959
1960 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1961 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1962 newdirfid->fid, new_name);
1963
1964 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1965 old_name, newdirfid->fid, new_name);
1966 if (IS_ERR(req)) {
1967 err = PTR_ERR(req);
1968 goto error;
1969 }
1970
1971 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1972 newdirfid->fid, new_name);
1973
1974 p9_free_req(clnt, req);
1975 error:
1976 return err;
1977 }
1978 EXPORT_SYMBOL(p9_client_renameat);
1979
1980 /*
1981 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1982 */
1983 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1984 const char *attr_name, u64 *attr_size)
1985 {
1986 int err;
1987 struct p9_req_t *req;
1988 struct p9_client *clnt;
1989 struct p9_fid *attr_fid;
1990
1991 err = 0;
1992 clnt = file_fid->clnt;
1993 attr_fid = p9_fid_create(clnt);
1994 if (IS_ERR(attr_fid)) {
1995 err = PTR_ERR(attr_fid);
1996 attr_fid = NULL;
1997 goto error;
1998 }
1999 p9_debug(P9_DEBUG_9P,
2000 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
2001 file_fid->fid, attr_fid->fid, attr_name);
2002
2003 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
2004 file_fid->fid, attr_fid->fid, attr_name);
2005 if (IS_ERR(req)) {
2006 err = PTR_ERR(req);
2007 goto error;
2008 }
2009 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
2010 if (err) {
2011 trace_9p_protocol_dump(clnt, req->rc);
2012 p9_free_req(clnt, req);
2013 goto clunk_fid;
2014 }
2015 p9_free_req(clnt, req);
2016 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2017 attr_fid->fid, *attr_size);
2018 return attr_fid;
2019 clunk_fid:
2020 p9_client_clunk(attr_fid);
2021 attr_fid = NULL;
2022 error:
2023 if (attr_fid && (attr_fid != file_fid))
2024 p9_fid_destroy(attr_fid);
2025
2026 return ERR_PTR(err);
2027 }
2028 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2029
2030 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2031 u64 attr_size, int flags)
2032 {
2033 int err;
2034 struct p9_req_t *req;
2035 struct p9_client *clnt;
2036
2037 p9_debug(P9_DEBUG_9P,
2038 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2039 fid->fid, name, (long long)attr_size, flags);
2040 err = 0;
2041 clnt = fid->clnt;
2042 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2043 fid->fid, name, attr_size, flags);
2044 if (IS_ERR(req)) {
2045 err = PTR_ERR(req);
2046 goto error;
2047 }
2048 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2049 p9_free_req(clnt, req);
2050 error:
2051 return err;
2052 }
2053 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2054
2055 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2056 {
2057 int err, rsize, non_zc = 0;
2058 struct p9_client *clnt;
2059 struct p9_req_t *req;
2060 char *dataptr;
2061
2062 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2063 fid->fid, (unsigned long long) offset, count);
2064
2065 err = 0;
2066 clnt = fid->clnt;
2067
2068 rsize = fid->iounit;
2069 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2070 rsize = clnt->msize - P9_READDIRHDRSZ;
2071
2072 if (count < rsize)
2073 rsize = count;
2074
2075 /* Don't bother zerocopy for small IO (< 1024) */
2076 if (clnt->trans_mod->zc_request && rsize > 1024) {
2077 /*
2078 * response header len is 11
2079 * PDU Header(7) + IO Size (4)
2080 */
2081 req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0,
2082 11, 1, "dqd", fid->fid, offset, rsize);
2083 } else {
2084 non_zc = 1;
2085 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2086 offset, rsize);
2087 }
2088 if (IS_ERR(req)) {
2089 err = PTR_ERR(req);
2090 goto error;
2091 }
2092
2093 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2094 if (err) {
2095 trace_9p_protocol_dump(clnt, req->rc);
2096 goto free_and_error;
2097 }
2098
2099 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2100
2101 if (non_zc)
2102 memmove(data, dataptr, count);
2103
2104 p9_free_req(clnt, req);
2105 return count;
2106
2107 free_and_error:
2108 p9_free_req(clnt, req);
2109 error:
2110 return err;
2111 }
2112 EXPORT_SYMBOL(p9_client_readdir);
2113
2114 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
2115 dev_t rdev, kgid_t gid, struct p9_qid *qid)
2116 {
2117 int err;
2118 struct p9_client *clnt;
2119 struct p9_req_t *req;
2120
2121 err = 0;
2122 clnt = fid->clnt;
2123 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2124 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2125 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2126 MAJOR(rdev), MINOR(rdev), gid);
2127 if (IS_ERR(req))
2128 return PTR_ERR(req);
2129
2130 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2131 if (err) {
2132 trace_9p_protocol_dump(clnt, req->rc);
2133 goto error;
2134 }
2135 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2136 (unsigned long long)qid->path, qid->version);
2137
2138 error:
2139 p9_free_req(clnt, req);
2140 return err;
2141
2142 }
2143 EXPORT_SYMBOL(p9_client_mknod_dotl);
2144
2145 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
2146 kgid_t gid, struct p9_qid *qid)
2147 {
2148 int err;
2149 struct p9_client *clnt;
2150 struct p9_req_t *req;
2151
2152 err = 0;
2153 clnt = fid->clnt;
2154 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2155 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2156 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
2157 gid);
2158 if (IS_ERR(req))
2159 return PTR_ERR(req);
2160
2161 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2162 if (err) {
2163 trace_9p_protocol_dump(clnt, req->rc);
2164 goto error;
2165 }
2166 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2167 (unsigned long long)qid->path, qid->version);
2168
2169 error:
2170 p9_free_req(clnt, req);
2171 return err;
2172
2173 }
2174 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2175
2176 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2177 {
2178 int err;
2179 struct p9_client *clnt;
2180 struct p9_req_t *req;
2181
2182 err = 0;
2183 clnt = fid->clnt;
2184 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2185 "start %lld length %lld proc_id %d client_id %s\n",
2186 fid->fid, flock->type, flock->flags, flock->start,
2187 flock->length, flock->proc_id, flock->client_id);
2188
2189 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2190 flock->flags, flock->start, flock->length,
2191 flock->proc_id, flock->client_id);
2192
2193 if (IS_ERR(req))
2194 return PTR_ERR(req);
2195
2196 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2197 if (err) {
2198 trace_9p_protocol_dump(clnt, req->rc);
2199 goto error;
2200 }
2201 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2202 error:
2203 p9_free_req(clnt, req);
2204 return err;
2205
2206 }
2207 EXPORT_SYMBOL(p9_client_lock_dotl);
2208
2209 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2210 {
2211 int err;
2212 struct p9_client *clnt;
2213 struct p9_req_t *req;
2214
2215 err = 0;
2216 clnt = fid->clnt;
2217 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2218 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2219 glock->start, glock->length, glock->proc_id, glock->client_id);
2220
2221 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2222 glock->start, glock->length, glock->proc_id, glock->client_id);
2223
2224 if (IS_ERR(req))
2225 return PTR_ERR(req);
2226
2227 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2228 &glock->start, &glock->length, &glock->proc_id,
2229 &glock->client_id);
2230 if (err) {
2231 trace_9p_protocol_dump(clnt, req->rc);
2232 goto error;
2233 }
2234 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2235 "proc_id %d client_id %s\n", glock->type, glock->start,
2236 glock->length, glock->proc_id, glock->client_id);
2237 error:
2238 p9_free_req(clnt, req);
2239 return err;
2240 }
2241 EXPORT_SYMBOL(p9_client_getlock_dotl);
2242
2243 int p9_client_readlink(struct p9_fid *fid, char **target)
2244 {
2245 int err;
2246 struct p9_client *clnt;
2247 struct p9_req_t *req;
2248
2249 err = 0;
2250 clnt = fid->clnt;
2251 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2252
2253 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2254 if (IS_ERR(req))
2255 return PTR_ERR(req);
2256
2257 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2258 if (err) {
2259 trace_9p_protocol_dump(clnt, req->rc);
2260 goto error;
2261 }
2262 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2263 error:
2264 p9_free_req(clnt, req);
2265 return err;
2266 }
2267 EXPORT_SYMBOL(p9_client_readlink);
Linux kernel - Deliverables
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