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9p: forgetting to cancel request on interrupted zero-copy RPC
[GitHub/mt8127/android_kernel_alcatel_ttab.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_2000u;
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 /**
208 * p9_tag_alloc - lookup/allocate a request by tag
209 * @c: client session to lookup tag within
210 * @tag: numeric id for transaction
211 *
212 * this is a simple array lookup, but will grow the
213 * request_slots as necessary to accommodate transaction
214 * ids which did not previously have a slot.
215 *
216 * this code relies on the client spinlock to manage locks, its
217 * possible we should switch to something else, but I'd rather
218 * stick with something low-overhead for the common case.
219 *
220 */
221
222 static struct p9_req_t *
223 p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
224 {
225 unsigned long flags;
226 int row, col;
227 struct p9_req_t *req;
228 int alloc_msize = min(c->msize, max_size);
229
230 /* This looks up the original request by tag so we know which
231 * buffer to read the data into */
232 tag++;
233
234 if (tag >= c->max_tag) {
235 spin_lock_irqsave(&c->lock, flags);
236 /* check again since original check was outside of lock */
237 while (tag >= c->max_tag) {
238 row = (tag / P9_ROW_MAXTAG);
239 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
240 sizeof(struct p9_req_t), GFP_ATOMIC);
241
242 if (!c->reqs[row]) {
243 pr_err("Couldn't grow tag array\n");
244 spin_unlock_irqrestore(&c->lock, flags);
245 return ERR_PTR(-ENOMEM);
246 }
247 for (col = 0; col < P9_ROW_MAXTAG; col++) {
248 c->reqs[row][col].status = REQ_STATUS_IDLE;
249 c->reqs[row][col].tc = NULL;
250 }
251 c->max_tag += P9_ROW_MAXTAG;
252 }
253 spin_unlock_irqrestore(&c->lock, flags);
254 }
255 row = tag / P9_ROW_MAXTAG;
256 col = tag % P9_ROW_MAXTAG;
257
258 req = &c->reqs[row][col];
259 if (!req->tc) {
260 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
261 if (!req->wq) {
262 pr_err("Couldn't grow tag array\n");
263 return ERR_PTR(-ENOMEM);
264 }
265 init_waitqueue_head(req->wq);
266 req->tc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
267 GFP_NOFS);
268 req->rc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
269 GFP_NOFS);
270 if ((!req->tc) || (!req->rc)) {
271 pr_err("Couldn't grow tag array\n");
272 kfree(req->tc);
273 kfree(req->rc);
274 kfree(req->wq);
275 req->tc = req->rc = NULL;
276 req->wq = NULL;
277 return ERR_PTR(-ENOMEM);
278 }
279 req->tc->capacity = alloc_msize;
280 req->rc->capacity = alloc_msize;
281 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
282 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
283 }
284
285 p9pdu_reset(req->tc);
286 p9pdu_reset(req->rc);
287
288 req->tc->tag = tag-1;
289 req->status = REQ_STATUS_ALLOC;
290
291 return &c->reqs[row][col];
292 }
293
294 /**
295 * p9_tag_lookup - lookup a request by tag
296 * @c: client session to lookup tag within
297 * @tag: numeric id for transaction
298 *
299 */
300
301 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
302 {
303 int row, col;
304
305 /* This looks up the original request by tag so we know which
306 * buffer to read the data into */
307 tag++;
308
309 if(tag >= c->max_tag)
310 return NULL;
311
312 row = tag / P9_ROW_MAXTAG;
313 col = tag % P9_ROW_MAXTAG;
314
315 return &c->reqs[row][col];
316 }
317 EXPORT_SYMBOL(p9_tag_lookup);
318
319 /**
320 * p9_tag_init - setup tags structure and contents
321 * @c: v9fs client struct
322 *
323 * This initializes the tags structure for each client instance.
324 *
325 */
326
327 static int p9_tag_init(struct p9_client *c)
328 {
329 int err = 0;
330
331 c->tagpool = p9_idpool_create();
332 if (IS_ERR(c->tagpool)) {
333 err = PTR_ERR(c->tagpool);
334 goto error;
335 }
336 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
337 if (err < 0) {
338 p9_idpool_destroy(c->tagpool);
339 goto error;
340 }
341 c->max_tag = 0;
342 error:
343 return err;
344 }
345
346 /**
347 * p9_tag_cleanup - cleans up tags structure and reclaims resources
348 * @c: v9fs client struct
349 *
350 * This frees resources associated with the tags structure
351 *
352 */
353 static void p9_tag_cleanup(struct p9_client *c)
354 {
355 int row, col;
356
357 /* check to insure all requests are idle */
358 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
359 for (col = 0; col < P9_ROW_MAXTAG; col++) {
360 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
361 p9_debug(P9_DEBUG_MUX,
362 "Attempting to cleanup non-free tag %d,%d\n",
363 row, col);
364 /* TODO: delay execution of cleanup */
365 return;
366 }
367 }
368 }
369
370 if (c->tagpool) {
371 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
372 p9_idpool_destroy(c->tagpool);
373 }
374
375 /* free requests associated with tags */
376 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
377 for (col = 0; col < P9_ROW_MAXTAG; col++) {
378 kfree(c->reqs[row][col].wq);
379 kfree(c->reqs[row][col].tc);
380 kfree(c->reqs[row][col].rc);
381 }
382 kfree(c->reqs[row]);
383 }
384 c->max_tag = 0;
385 }
386
387 /**
388 * p9_free_req - free a request and clean-up as necessary
389 * c: client state
390 * r: request to release
391 *
392 */
393
394 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
395 {
396 int tag = r->tc->tag;
397 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
398
399 r->status = REQ_STATUS_IDLE;
400 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
401 p9_idpool_put(tag, c->tagpool);
402 }
403
404 /**
405 * p9_client_cb - call back from transport to client
406 * c: client state
407 * req: request received
408 *
409 */
410 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
411 {
412 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
413 wake_up(req->wq);
414 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
415 }
416 EXPORT_SYMBOL(p9_client_cb);
417
418 /**
419 * p9_parse_header - parse header arguments out of a packet
420 * @pdu: packet to parse
421 * @size: size of packet
422 * @type: type of request
423 * @tag: tag of packet
424 * @rewind: set if we need to rewind offset afterwards
425 */
426
427 int
428 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
429 int rewind)
430 {
431 int8_t r_type;
432 int16_t r_tag;
433 int32_t r_size;
434 int offset = pdu->offset;
435 int err;
436
437 pdu->offset = 0;
438 if (pdu->size == 0)
439 pdu->size = 7;
440
441 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
442 if (err)
443 goto rewind_and_exit;
444
445 pdu->size = r_size;
446 pdu->id = r_type;
447 pdu->tag = r_tag;
448
449 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
450 pdu->size, pdu->id, pdu->tag);
451
452 if (type)
453 *type = r_type;
454 if (tag)
455 *tag = r_tag;
456 if (size)
457 *size = r_size;
458
459
460 rewind_and_exit:
461 if (rewind)
462 pdu->offset = offset;
463 return err;
464 }
465 EXPORT_SYMBOL(p9_parse_header);
466
467 /**
468 * p9_check_errors - check 9p packet for error return and process it
469 * @c: current client instance
470 * @req: request to parse and check for error conditions
471 *
472 * returns error code if one is discovered, otherwise returns 0
473 *
474 * this will have to be more complicated if we have multiple
475 * error packet types
476 */
477
478 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
479 {
480 int8_t type;
481 int err;
482 int ecode;
483
484 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
485 /*
486 * dump the response from server
487 * This should be after check errors which poplulate pdu_fcall.
488 */
489 trace_9p_protocol_dump(c, req->rc);
490 if (err) {
491 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
492 return err;
493 }
494 if (type != P9_RERROR && type != P9_RLERROR)
495 return 0;
496
497 if (!p9_is_proto_dotl(c)) {
498 char *ename;
499 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
500 &ename, &ecode);
501 if (err)
502 goto out_err;
503
504 if (p9_is_proto_dotu(c))
505 err = -ecode;
506
507 if (!err || !IS_ERR_VALUE(err)) {
508 err = p9_errstr2errno(ename, strlen(ename));
509
510 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
511 -ecode, ename);
512 }
513 kfree(ename);
514 } else {
515 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
516 err = -ecode;
517
518 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
519 }
520
521 return err;
522
523 out_err:
524 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
525
526 return err;
527 }
528
529 /**
530 * p9_check_zc_errors - check 9p packet for error return and process it
531 * @c: current client instance
532 * @req: request to parse and check for error conditions
533 * @in_hdrlen: Size of response protocol buffer.
534 *
535 * returns error code if one is discovered, otherwise returns 0
536 *
537 * this will have to be more complicated if we have multiple
538 * error packet types
539 */
540
541 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
542 char *uidata, int in_hdrlen, int kern_buf)
543 {
544 int err;
545 int ecode;
546 int8_t type;
547 char *ename = NULL;
548
549 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
550 /*
551 * dump the response from server
552 * This should be after parse_header which poplulate pdu_fcall.
553 */
554 trace_9p_protocol_dump(c, req->rc);
555 if (err) {
556 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
557 return err;
558 }
559
560 if (type != P9_RERROR && type != P9_RLERROR)
561 return 0;
562
563 if (!p9_is_proto_dotl(c)) {
564 /* Error is reported in string format */
565 int len;
566 /* 7 = header size for RERROR; */
567 int inline_len = in_hdrlen - 7;
568
569 len = req->rc->size - req->rc->offset;
570 if (len > (P9_ZC_HDR_SZ - 7)) {
571 err = -EFAULT;
572 goto out_err;
573 }
574
575 ename = &req->rc->sdata[req->rc->offset];
576 if (len > inline_len) {
577 /* We have error in external buffer */
578 if (kern_buf) {
579 memcpy(ename + inline_len, uidata,
580 len - inline_len);
581 } else {
582 err = copy_from_user(ename + inline_len,
583 uidata, len - inline_len);
584 if (err) {
585 err = -EFAULT;
586 goto out_err;
587 }
588 }
589 }
590 ename = NULL;
591 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
592 &ename, &ecode);
593 if (err)
594 goto out_err;
595
596 if (p9_is_proto_dotu(c))
597 err = -ecode;
598
599 if (!err || !IS_ERR_VALUE(err)) {
600 err = p9_errstr2errno(ename, strlen(ename));
601
602 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
603 -ecode, ename);
604 }
605 kfree(ename);
606 } else {
607 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
608 err = -ecode;
609
610 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
611 }
612 return err;
613
614 out_err:
615 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
616 return err;
617 }
618
619 static struct p9_req_t *
620 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
621
622 /**
623 * p9_client_flush - flush (cancel) a request
624 * @c: client state
625 * @oldreq: request to cancel
626 *
627 * This sents a flush for a particular request and links
628 * the flush request to the original request. The current
629 * code only supports a single flush request although the protocol
630 * allows for multiple flush requests to be sent for a single request.
631 *
632 */
633
634 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
635 {
636 struct p9_req_t *req;
637 int16_t oldtag;
638 int err;
639
640 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
641 if (err)
642 return err;
643
644 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
645
646 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
647 if (IS_ERR(req))
648 return PTR_ERR(req);
649
650
651 /* if we haven't received a response for oldreq,
652 remove it from the list. */
653 spin_lock(&c->lock);
654 if (oldreq->status == REQ_STATUS_FLSH)
655 list_del(&oldreq->req_list);
656 spin_unlock(&c->lock);
657
658 p9_free_req(c, req);
659 return 0;
660 }
661
662 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
663 int8_t type, int req_size,
664 const char *fmt, va_list ap)
665 {
666 int tag, err;
667 struct p9_req_t *req;
668
669 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
670
671 /* we allow for any status other than disconnected */
672 if (c->status == Disconnected)
673 return ERR_PTR(-EIO);
674
675 /* if status is begin_disconnected we allow only clunk request */
676 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
677 return ERR_PTR(-EIO);
678
679 tag = P9_NOTAG;
680 if (type != P9_TVERSION) {
681 tag = p9_idpool_get(c->tagpool);
682 if (tag < 0)
683 return ERR_PTR(-ENOMEM);
684 }
685
686 req = p9_tag_alloc(c, tag, req_size);
687 if (IS_ERR(req))
688 return req;
689
690 /* marshall the data */
691 p9pdu_prepare(req->tc, tag, type);
692 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
693 if (err)
694 goto reterr;
695 p9pdu_finalize(c, req->tc);
696 trace_9p_client_req(c, type, tag);
697 return req;
698 reterr:
699 p9_free_req(c, req);
700 return ERR_PTR(err);
701 }
702
703 /**
704 * p9_client_rpc - issue a request and wait for a response
705 * @c: client session
706 * @type: type of request
707 * @fmt: protocol format string (see protocol.c)
708 *
709 * Returns request structure (which client must free using p9_free_req)
710 */
711
712 static struct p9_req_t *
713 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
714 {
715 va_list ap;
716 int sigpending, err;
717 unsigned long flags;
718 struct p9_req_t *req;
719
720 va_start(ap, fmt);
721 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
722 va_end(ap);
723 if (IS_ERR(req))
724 return req;
725
726 if (signal_pending(current)) {
727 sigpending = 1;
728 clear_thread_flag(TIF_SIGPENDING);
729 } else
730 sigpending = 0;
731
732 err = c->trans_mod->request(c, req);
733 if (err < 0) {
734 if (err != -ERESTARTSYS && err != -EFAULT)
735 c->status = Disconnected;
736 goto reterr;
737 }
738 again:
739 /* Wait for the response */
740 err = wait_event_interruptible(*req->wq,
741 req->status >= REQ_STATUS_RCVD);
742
743 if ((err == -ERESTARTSYS) && (c->status == Connected)
744 && (type == P9_TFLUSH)) {
745 sigpending = 1;
746 clear_thread_flag(TIF_SIGPENDING);
747 goto again;
748 }
749
750 if (req->status == REQ_STATUS_ERROR) {
751 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
752 err = req->t_err;
753 }
754 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
755 p9_debug(P9_DEBUG_MUX, "flushing\n");
756 sigpending = 1;
757 clear_thread_flag(TIF_SIGPENDING);
758
759 if (c->trans_mod->cancel(c, req))
760 p9_client_flush(c, req);
761
762 /* if we received the response anyway, don't signal error */
763 if (req->status == REQ_STATUS_RCVD)
764 err = 0;
765 }
766 if (sigpending) {
767 spin_lock_irqsave(&current->sighand->siglock, flags);
768 recalc_sigpending();
769 spin_unlock_irqrestore(&current->sighand->siglock, flags);
770 }
771 if (err < 0)
772 goto reterr;
773
774 err = p9_check_errors(c, req);
775 trace_9p_client_res(c, type, req->rc->tag, err);
776 if (!err)
777 return req;
778 reterr:
779 p9_free_req(c, req);
780 return ERR_PTR(safe_errno(err));
781 }
782
783 /**
784 * p9_client_zc_rpc - issue a request and wait for a response
785 * @c: client session
786 * @type: type of request
787 * @uidata: user bffer that should be ued for zero copy read
788 * @uodata: user buffer that shoud be user for zero copy write
789 * @inlen: read buffer size
790 * @olen: write buffer size
791 * @hdrlen: reader header size, This is the size of response protocol data
792 * @fmt: protocol format string (see protocol.c)
793 *
794 * Returns request structure (which client must free using p9_free_req)
795 */
796 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
797 char *uidata, char *uodata,
798 int inlen, int olen, int in_hdrlen,
799 int kern_buf, const char *fmt, ...)
800 {
801 va_list ap;
802 int sigpending, err;
803 unsigned long flags;
804 struct p9_req_t *req;
805
806 va_start(ap, fmt);
807 /*
808 * We allocate a inline protocol data of only 4k bytes.
809 * The actual content is passed in zero-copy fashion.
810 */
811 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
812 va_end(ap);
813 if (IS_ERR(req))
814 return req;
815
816 if (signal_pending(current)) {
817 sigpending = 1;
818 clear_thread_flag(TIF_SIGPENDING);
819 } else
820 sigpending = 0;
821
822 /* If we are called with KERNEL_DS force kern_buf */
823 if (segment_eq(get_fs(), KERNEL_DS))
824 kern_buf = 1;
825
826 err = c->trans_mod->zc_request(c, req, uidata, uodata,
827 inlen, olen, in_hdrlen, kern_buf);
828 if (err < 0) {
829 if (err == -EIO)
830 c->status = Disconnected;
831 if (err != -ERESTARTSYS)
832 goto reterr;
833 }
834 if (req->status == REQ_STATUS_ERROR) {
835 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
836 err = req->t_err;
837 }
838 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
839 p9_debug(P9_DEBUG_MUX, "flushing\n");
840 sigpending = 1;
841 clear_thread_flag(TIF_SIGPENDING);
842
843 if (c->trans_mod->cancel(c, req))
844 p9_client_flush(c, req);
845
846 /* if we received the response anyway, don't signal error */
847 if (req->status == REQ_STATUS_RCVD)
848 err = 0;
849 }
850 if (sigpending) {
851 spin_lock_irqsave(&current->sighand->siglock, flags);
852 recalc_sigpending();
853 spin_unlock_irqrestore(&current->sighand->siglock, flags);
854 }
855 if (err < 0)
856 goto reterr;
857
858 err = p9_check_zc_errors(c, req, uidata, in_hdrlen, kern_buf);
859 trace_9p_client_res(c, type, req->rc->tag, err);
860 if (!err)
861 return req;
862 reterr:
863 p9_free_req(c, req);
864 return ERR_PTR(safe_errno(err));
865 }
866
867 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
868 {
869 int ret;
870 struct p9_fid *fid;
871 unsigned long flags;
872
873 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
874 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
875 if (!fid)
876 return ERR_PTR(-ENOMEM);
877
878 ret = p9_idpool_get(clnt->fidpool);
879 if (ret < 0) {
880 ret = -ENOSPC;
881 goto error;
882 }
883 fid->fid = ret;
884
885 memset(&fid->qid, 0, sizeof(struct p9_qid));
886 fid->mode = -1;
887 fid->uid = current_fsuid();
888 fid->clnt = clnt;
889 fid->rdir = NULL;
890 spin_lock_irqsave(&clnt->lock, flags);
891 list_add(&fid->flist, &clnt->fidlist);
892 spin_unlock_irqrestore(&clnt->lock, flags);
893
894 return fid;
895
896 error:
897 kfree(fid);
898 return ERR_PTR(ret);
899 }
900
901 static void p9_fid_destroy(struct p9_fid *fid)
902 {
903 struct p9_client *clnt;
904 unsigned long flags;
905
906 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
907 clnt = fid->clnt;
908 p9_idpool_put(fid->fid, clnt->fidpool);
909 spin_lock_irqsave(&clnt->lock, flags);
910 list_del(&fid->flist);
911 spin_unlock_irqrestore(&clnt->lock, flags);
912 kfree(fid->rdir);
913 kfree(fid);
914 }
915
916 static int p9_client_version(struct p9_client *c)
917 {
918 int err = 0;
919 struct p9_req_t *req;
920 char *version;
921 int msize;
922
923 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
924 c->msize, c->proto_version);
925
926 switch (c->proto_version) {
927 case p9_proto_2000L:
928 req = p9_client_rpc(c, P9_TVERSION, "ds",
929 c->msize, "9P2000.L");
930 break;
931 case p9_proto_2000u:
932 req = p9_client_rpc(c, P9_TVERSION, "ds",
933 c->msize, "9P2000.u");
934 break;
935 case p9_proto_legacy:
936 req = p9_client_rpc(c, P9_TVERSION, "ds",
937 c->msize, "9P2000");
938 break;
939 default:
940 return -EINVAL;
941 break;
942 }
943
944 if (IS_ERR(req))
945 return PTR_ERR(req);
946
947 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
948 if (err) {
949 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
950 trace_9p_protocol_dump(c, req->rc);
951 goto error;
952 }
953
954 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
955 if (!strncmp(version, "9P2000.L", 8))
956 c->proto_version = p9_proto_2000L;
957 else if (!strncmp(version, "9P2000.u", 8))
958 c->proto_version = p9_proto_2000u;
959 else if (!strncmp(version, "9P2000", 6))
960 c->proto_version = p9_proto_legacy;
961 else {
962 err = -EREMOTEIO;
963 goto error;
964 }
965
966 if (msize < c->msize)
967 c->msize = msize;
968
969 error:
970 kfree(version);
971 p9_free_req(c, req);
972
973 return err;
974 }
975
976 struct p9_client *p9_client_create(const char *dev_name, char *options)
977 {
978 int err;
979 struct p9_client *clnt;
980
981 err = 0;
982 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
983 if (!clnt)
984 return ERR_PTR(-ENOMEM);
985
986 clnt->trans_mod = NULL;
987 clnt->trans = NULL;
988 spin_lock_init(&clnt->lock);
989 INIT_LIST_HEAD(&clnt->fidlist);
990
991 err = p9_tag_init(clnt);
992 if (err < 0)
993 goto free_client;
994
995 err = parse_opts(options, clnt);
996 if (err < 0)
997 goto destroy_tagpool;
998
999 if (!clnt->trans_mod)
1000 clnt->trans_mod = v9fs_get_default_trans();
1001
1002 if (clnt->trans_mod == NULL) {
1003 err = -EPROTONOSUPPORT;
1004 p9_debug(P9_DEBUG_ERROR,
1005 "No transport defined or default transport\n");
1006 goto destroy_tagpool;
1007 }
1008
1009 clnt->fidpool = p9_idpool_create();
1010 if (IS_ERR(clnt->fidpool)) {
1011 err = PTR_ERR(clnt->fidpool);
1012 goto put_trans;
1013 }
1014
1015 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1016 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1017
1018 err = clnt->trans_mod->create(clnt, dev_name, options);
1019 if (err)
1020 goto destroy_fidpool;
1021
1022 if (clnt->msize > clnt->trans_mod->maxsize)
1023 clnt->msize = clnt->trans_mod->maxsize;
1024
1025 err = p9_client_version(clnt);
1026 if (err)
1027 goto close_trans;
1028
1029 return clnt;
1030
1031 close_trans:
1032 clnt->trans_mod->close(clnt);
1033 destroy_fidpool:
1034 p9_idpool_destroy(clnt->fidpool);
1035 put_trans:
1036 v9fs_put_trans(clnt->trans_mod);
1037 destroy_tagpool:
1038 p9_idpool_destroy(clnt->tagpool);
1039 free_client:
1040 kfree(clnt);
1041 return ERR_PTR(err);
1042 }
1043 EXPORT_SYMBOL(p9_client_create);
1044
1045 void p9_client_destroy(struct p9_client *clnt)
1046 {
1047 struct p9_fid *fid, *fidptr;
1048
1049 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1050
1051 if (clnt->trans_mod)
1052 clnt->trans_mod->close(clnt);
1053
1054 v9fs_put_trans(clnt->trans_mod);
1055
1056 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
1057 pr_info("Found fid %d not clunked\n", fid->fid);
1058 p9_fid_destroy(fid);
1059 }
1060
1061 if (clnt->fidpool)
1062 p9_idpool_destroy(clnt->fidpool);
1063
1064 p9_tag_cleanup(clnt);
1065
1066 kfree(clnt);
1067 }
1068 EXPORT_SYMBOL(p9_client_destroy);
1069
1070 void p9_client_disconnect(struct p9_client *clnt)
1071 {
1072 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1073 clnt->status = Disconnected;
1074 }
1075 EXPORT_SYMBOL(p9_client_disconnect);
1076
1077 void p9_client_begin_disconnect(struct p9_client *clnt)
1078 {
1079 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1080 clnt->status = BeginDisconnect;
1081 }
1082 EXPORT_SYMBOL(p9_client_begin_disconnect);
1083
1084 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1085 char *uname, kuid_t n_uname, char *aname)
1086 {
1087 int err = 0;
1088 struct p9_req_t *req;
1089 struct p9_fid *fid;
1090 struct p9_qid qid;
1091
1092
1093 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1094 afid ? afid->fid : -1, uname, aname);
1095 fid = p9_fid_create(clnt);
1096 if (IS_ERR(fid)) {
1097 err = PTR_ERR(fid);
1098 fid = NULL;
1099 goto error;
1100 }
1101
1102 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1103 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1104 if (IS_ERR(req)) {
1105 err = PTR_ERR(req);
1106 goto error;
1107 }
1108
1109 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
1110 if (err) {
1111 trace_9p_protocol_dump(clnt, req->rc);
1112 p9_free_req(clnt, req);
1113 goto error;
1114 }
1115
1116 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1117 qid.type, (unsigned long long)qid.path, qid.version);
1118
1119 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1120
1121 p9_free_req(clnt, req);
1122 return fid;
1123
1124 error:
1125 if (fid)
1126 p9_fid_destroy(fid);
1127 return ERR_PTR(err);
1128 }
1129 EXPORT_SYMBOL(p9_client_attach);
1130
1131 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1132 char **wnames, int clone)
1133 {
1134 int err;
1135 struct p9_client *clnt;
1136 struct p9_fid *fid;
1137 struct p9_qid *wqids;
1138 struct p9_req_t *req;
1139 uint16_t nwqids, count;
1140
1141 err = 0;
1142 wqids = NULL;
1143 clnt = oldfid->clnt;
1144 if (clone) {
1145 fid = p9_fid_create(clnt);
1146 if (IS_ERR(fid)) {
1147 err = PTR_ERR(fid);
1148 fid = NULL;
1149 goto error;
1150 }
1151
1152 fid->uid = oldfid->uid;
1153 } else
1154 fid = oldfid;
1155
1156
1157 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1158 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1159
1160 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1161 nwname, wnames);
1162 if (IS_ERR(req)) {
1163 err = PTR_ERR(req);
1164 goto error;
1165 }
1166
1167 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1168 if (err) {
1169 trace_9p_protocol_dump(clnt, req->rc);
1170 p9_free_req(clnt, req);
1171 goto clunk_fid;
1172 }
1173 p9_free_req(clnt, req);
1174
1175 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1176
1177 if (nwqids != nwname) {
1178 err = -ENOENT;
1179 goto clunk_fid;
1180 }
1181
1182 for (count = 0; count < nwqids; count++)
1183 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1184 count, wqids[count].type,
1185 (unsigned long long)wqids[count].path,
1186 wqids[count].version);
1187
1188 if (nwname)
1189 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1190 else
1191 fid->qid = oldfid->qid;
1192
1193 kfree(wqids);
1194 return fid;
1195
1196 clunk_fid:
1197 kfree(wqids);
1198 p9_client_clunk(fid);
1199 fid = NULL;
1200
1201 error:
1202 if (fid && (fid != oldfid))
1203 p9_fid_destroy(fid);
1204
1205 return ERR_PTR(err);
1206 }
1207 EXPORT_SYMBOL(p9_client_walk);
1208
1209 int p9_client_open(struct p9_fid *fid, int mode)
1210 {
1211 int err;
1212 struct p9_client *clnt;
1213 struct p9_req_t *req;
1214 struct p9_qid qid;
1215 int iounit;
1216
1217 clnt = fid->clnt;
1218 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1219 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1220 err = 0;
1221
1222 if (fid->mode != -1)
1223 return -EINVAL;
1224
1225 if (p9_is_proto_dotl(clnt))
1226 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1227 else
1228 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1229 if (IS_ERR(req)) {
1230 err = PTR_ERR(req);
1231 goto error;
1232 }
1233
1234 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1235 if (err) {
1236 trace_9p_protocol_dump(clnt, req->rc);
1237 goto free_and_error;
1238 }
1239
1240 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1241 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1242 (unsigned long long)qid.path, qid.version, iounit);
1243
1244 fid->mode = mode;
1245 fid->iounit = iounit;
1246
1247 free_and_error:
1248 p9_free_req(clnt, req);
1249 error:
1250 return err;
1251 }
1252 EXPORT_SYMBOL(p9_client_open);
1253
1254 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1255 kgid_t gid, struct p9_qid *qid)
1256 {
1257 int err = 0;
1258 struct p9_client *clnt;
1259 struct p9_req_t *req;
1260 int iounit;
1261
1262 p9_debug(P9_DEBUG_9P,
1263 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1264 ofid->fid, name, flags, mode,
1265 from_kgid(&init_user_ns, gid));
1266 clnt = ofid->clnt;
1267
1268 if (ofid->mode != -1)
1269 return -EINVAL;
1270
1271 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1272 mode, gid);
1273 if (IS_ERR(req)) {
1274 err = PTR_ERR(req);
1275 goto error;
1276 }
1277
1278 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1279 if (err) {
1280 trace_9p_protocol_dump(clnt, req->rc);
1281 goto free_and_error;
1282 }
1283
1284 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1285 qid->type,
1286 (unsigned long long)qid->path,
1287 qid->version, iounit);
1288
1289 ofid->mode = mode;
1290 ofid->iounit = iounit;
1291
1292 free_and_error:
1293 p9_free_req(clnt, req);
1294 error:
1295 return err;
1296 }
1297 EXPORT_SYMBOL(p9_client_create_dotl);
1298
1299 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1300 char *extension)
1301 {
1302 int err;
1303 struct p9_client *clnt;
1304 struct p9_req_t *req;
1305 struct p9_qid qid;
1306 int iounit;
1307
1308 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1309 fid->fid, name, perm, mode);
1310 err = 0;
1311 clnt = fid->clnt;
1312
1313 if (fid->mode != -1)
1314 return -EINVAL;
1315
1316 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1317 mode, extension);
1318 if (IS_ERR(req)) {
1319 err = PTR_ERR(req);
1320 goto error;
1321 }
1322
1323 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1324 if (err) {
1325 trace_9p_protocol_dump(clnt, req->rc);
1326 goto free_and_error;
1327 }
1328
1329 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1330 qid.type,
1331 (unsigned long long)qid.path,
1332 qid.version, iounit);
1333
1334 fid->mode = mode;
1335 fid->iounit = iounit;
1336
1337 free_and_error:
1338 p9_free_req(clnt, req);
1339 error:
1340 return err;
1341 }
1342 EXPORT_SYMBOL(p9_client_fcreate);
1343
1344 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, kgid_t gid,
1345 struct p9_qid *qid)
1346 {
1347 int err = 0;
1348 struct p9_client *clnt;
1349 struct p9_req_t *req;
1350
1351 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1352 dfid->fid, name, symtgt);
1353 clnt = dfid->clnt;
1354
1355 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1356 gid);
1357 if (IS_ERR(req)) {
1358 err = PTR_ERR(req);
1359 goto error;
1360 }
1361
1362 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1363 if (err) {
1364 trace_9p_protocol_dump(clnt, req->rc);
1365 goto free_and_error;
1366 }
1367
1368 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1369 qid->type, (unsigned long long)qid->path, qid->version);
1370
1371 free_and_error:
1372 p9_free_req(clnt, req);
1373 error:
1374 return err;
1375 }
1376 EXPORT_SYMBOL(p9_client_symlink);
1377
1378 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1379 {
1380 struct p9_client *clnt;
1381 struct p9_req_t *req;
1382
1383 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1384 dfid->fid, oldfid->fid, newname);
1385 clnt = dfid->clnt;
1386 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1387 newname);
1388 if (IS_ERR(req))
1389 return PTR_ERR(req);
1390
1391 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1392 p9_free_req(clnt, req);
1393 return 0;
1394 }
1395 EXPORT_SYMBOL(p9_client_link);
1396
1397 int p9_client_fsync(struct p9_fid *fid, int datasync)
1398 {
1399 int err;
1400 struct p9_client *clnt;
1401 struct p9_req_t *req;
1402
1403 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1404 fid->fid, datasync);
1405 err = 0;
1406 clnt = fid->clnt;
1407
1408 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1409 if (IS_ERR(req)) {
1410 err = PTR_ERR(req);
1411 goto error;
1412 }
1413
1414 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1415
1416 p9_free_req(clnt, req);
1417
1418 error:
1419 return err;
1420 }
1421 EXPORT_SYMBOL(p9_client_fsync);
1422
1423 int p9_client_clunk(struct p9_fid *fid)
1424 {
1425 int err;
1426 struct p9_client *clnt;
1427 struct p9_req_t *req;
1428 int retries = 0;
1429
1430 if (!fid) {
1431 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1432 __func__, task_pid_nr(current));
1433 dump_stack();
1434 return 0;
1435 }
1436
1437 again:
1438 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1439 retries);
1440 err = 0;
1441 clnt = fid->clnt;
1442
1443 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1444 if (IS_ERR(req)) {
1445 err = PTR_ERR(req);
1446 goto error;
1447 }
1448
1449 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1450
1451 p9_free_req(clnt, req);
1452 error:
1453 /*
1454 * Fid is not valid even after a failed clunk
1455 * If interrupted, retry once then give up and
1456 * leak fid until umount.
1457 */
1458 if (err == -ERESTARTSYS) {
1459 if (retries++ == 0)
1460 goto again;
1461 } else
1462 p9_fid_destroy(fid);
1463 return err;
1464 }
1465 EXPORT_SYMBOL(p9_client_clunk);
1466
1467 int p9_client_remove(struct p9_fid *fid)
1468 {
1469 int err;
1470 struct p9_client *clnt;
1471 struct p9_req_t *req;
1472
1473 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1474 err = 0;
1475 clnt = fid->clnt;
1476
1477 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1478 if (IS_ERR(req)) {
1479 err = PTR_ERR(req);
1480 goto error;
1481 }
1482
1483 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1484
1485 p9_free_req(clnt, req);
1486 error:
1487 if (err == -ERESTARTSYS)
1488 p9_client_clunk(fid);
1489 else
1490 p9_fid_destroy(fid);
1491 return err;
1492 }
1493 EXPORT_SYMBOL(p9_client_remove);
1494
1495 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1496 {
1497 int err = 0;
1498 struct p9_req_t *req;
1499 struct p9_client *clnt;
1500
1501 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1502 dfid->fid, name, flags);
1503
1504 clnt = dfid->clnt;
1505 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1506 if (IS_ERR(req)) {
1507 err = PTR_ERR(req);
1508 goto error;
1509 }
1510 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1511
1512 p9_free_req(clnt, req);
1513 error:
1514 return err;
1515 }
1516 EXPORT_SYMBOL(p9_client_unlinkat);
1517
1518 int
1519 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1520 u32 count)
1521 {
1522 char *dataptr;
1523 int kernel_buf = 0;
1524 struct p9_req_t *req;
1525 struct p9_client *clnt;
1526 int err, rsize, non_zc = 0;
1527
1528
1529 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1530 fid->fid, (unsigned long long) offset, count);
1531 err = 0;
1532 clnt = fid->clnt;
1533
1534 rsize = fid->iounit;
1535 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1536 rsize = clnt->msize - P9_IOHDRSZ;
1537
1538 if (count < rsize)
1539 rsize = count;
1540
1541 /* Don't bother zerocopy for small IO (< 1024) */
1542 if (clnt->trans_mod->zc_request && rsize > 1024) {
1543 char *indata;
1544 if (data) {
1545 kernel_buf = 1;
1546 indata = data;
1547 } else
1548 indata = (__force char *)udata;
1549 /*
1550 * response header len is 11
1551 * PDU Header(7) + IO Size (4)
1552 */
1553 req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0,
1554 11, kernel_buf, "dqd", fid->fid,
1555 offset, rsize);
1556 } else {
1557 non_zc = 1;
1558 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1559 rsize);
1560 }
1561 if (IS_ERR(req)) {
1562 err = PTR_ERR(req);
1563 goto error;
1564 }
1565
1566 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1567 if (err) {
1568 trace_9p_protocol_dump(clnt, req->rc);
1569 goto free_and_error;
1570 }
1571
1572 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1573
1574 if (non_zc) {
1575 if (data) {
1576 memmove(data, dataptr, count);
1577 } else {
1578 err = copy_to_user(udata, dataptr, count);
1579 if (err) {
1580 err = -EFAULT;
1581 goto free_and_error;
1582 }
1583 }
1584 }
1585 p9_free_req(clnt, req);
1586 return count;
1587
1588 free_and_error:
1589 p9_free_req(clnt, req);
1590 error:
1591 return err;
1592 }
1593 EXPORT_SYMBOL(p9_client_read);
1594
1595 int
1596 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1597 u64 offset, u32 count)
1598 {
1599 int err, rsize;
1600 int kernel_buf = 0;
1601 struct p9_client *clnt;
1602 struct p9_req_t *req;
1603
1604 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1605 fid->fid, (unsigned long long) offset, count);
1606 err = 0;
1607 clnt = fid->clnt;
1608
1609 rsize = fid->iounit;
1610 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1611 rsize = clnt->msize - P9_IOHDRSZ;
1612
1613 if (count < rsize)
1614 rsize = count;
1615
1616 /* Don't bother zerocopy for small IO (< 1024) */
1617 if (clnt->trans_mod->zc_request && rsize > 1024) {
1618 char *odata;
1619 if (data) {
1620 kernel_buf = 1;
1621 odata = data;
1622 } else
1623 odata = (char *)udata;
1624 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize,
1625 P9_ZC_HDR_SZ, kernel_buf, "dqd",
1626 fid->fid, offset, rsize);
1627 } else {
1628 if (data)
1629 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
1630 offset, rsize, data);
1631 else
1632 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
1633 offset, rsize, udata);
1634 }
1635 if (IS_ERR(req)) {
1636 err = PTR_ERR(req);
1637 goto error;
1638 }
1639
1640 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1641 if (err) {
1642 trace_9p_protocol_dump(clnt, req->rc);
1643 goto free_and_error;
1644 }
1645
1646 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1647
1648 p9_free_req(clnt, req);
1649 return count;
1650
1651 free_and_error:
1652 p9_free_req(clnt, req);
1653 error:
1654 return err;
1655 }
1656 EXPORT_SYMBOL(p9_client_write);
1657
1658 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1659 {
1660 int err;
1661 struct p9_client *clnt;
1662 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1663 struct p9_req_t *req;
1664 u16 ignored;
1665
1666 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1667
1668 if (!ret)
1669 return ERR_PTR(-ENOMEM);
1670
1671 err = 0;
1672 clnt = fid->clnt;
1673
1674 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1675 if (IS_ERR(req)) {
1676 err = PTR_ERR(req);
1677 goto error;
1678 }
1679
1680 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1681 if (err) {
1682 trace_9p_protocol_dump(clnt, req->rc);
1683 p9_free_req(clnt, req);
1684 goto error;
1685 }
1686
1687 p9_debug(P9_DEBUG_9P,
1688 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1689 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1690 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1691 "<<< uid=%d gid=%d n_muid=%d\n",
1692 ret->size, ret->type, ret->dev, ret->qid.type,
1693 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1694 ret->atime, ret->mtime, (unsigned long long)ret->length,
1695 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1696 from_kuid(&init_user_ns, ret->n_uid),
1697 from_kgid(&init_user_ns, ret->n_gid),
1698 from_kuid(&init_user_ns, ret->n_muid));
1699
1700 p9_free_req(clnt, req);
1701 return ret;
1702
1703 error:
1704 kfree(ret);
1705 return ERR_PTR(err);
1706 }
1707 EXPORT_SYMBOL(p9_client_stat);
1708
1709 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1710 u64 request_mask)
1711 {
1712 int err;
1713 struct p9_client *clnt;
1714 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1715 GFP_KERNEL);
1716 struct p9_req_t *req;
1717
1718 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1719 fid->fid, request_mask);
1720
1721 if (!ret)
1722 return ERR_PTR(-ENOMEM);
1723
1724 err = 0;
1725 clnt = fid->clnt;
1726
1727 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1728 if (IS_ERR(req)) {
1729 err = PTR_ERR(req);
1730 goto error;
1731 }
1732
1733 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1734 if (err) {
1735 trace_9p_protocol_dump(clnt, req->rc);
1736 p9_free_req(clnt, req);
1737 goto error;
1738 }
1739
1740 p9_debug(P9_DEBUG_9P,
1741 "<<< RGETATTR st_result_mask=%lld\n"
1742 "<<< qid=%x.%llx.%x\n"
1743 "<<< st_mode=%8.8x st_nlink=%llu\n"
1744 "<<< st_uid=%d st_gid=%d\n"
1745 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1746 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1747 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1748 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1749 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1750 "<<< st_gen=%lld st_data_version=%lld",
1751 ret->st_result_mask, ret->qid.type, ret->qid.path,
1752 ret->qid.version, ret->st_mode, ret->st_nlink,
1753 from_kuid(&init_user_ns, ret->st_uid),
1754 from_kgid(&init_user_ns, ret->st_gid),
1755 ret->st_rdev, ret->st_size, ret->st_blksize,
1756 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1757 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1758 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1759 ret->st_gen, ret->st_data_version);
1760
1761 p9_free_req(clnt, req);
1762 return ret;
1763
1764 error:
1765 kfree(ret);
1766 return ERR_PTR(err);
1767 }
1768 EXPORT_SYMBOL(p9_client_getattr_dotl);
1769
1770 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1771 {
1772 int ret;
1773
1774 /* NOTE: size shouldn't include its own length */
1775 /* size[2] type[2] dev[4] qid[13] */
1776 /* mode[4] atime[4] mtime[4] length[8]*/
1777 /* name[s] uid[s] gid[s] muid[s] */
1778 ret = 2+4+13+4+4+4+8+2+2+2+2;
1779
1780 if (wst->name)
1781 ret += strlen(wst->name);
1782 if (wst->uid)
1783 ret += strlen(wst->uid);
1784 if (wst->gid)
1785 ret += strlen(wst->gid);
1786 if (wst->muid)
1787 ret += strlen(wst->muid);
1788
1789 if ((proto_version == p9_proto_2000u) ||
1790 (proto_version == p9_proto_2000L)) {
1791 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1792 if (wst->extension)
1793 ret += strlen(wst->extension);
1794 }
1795
1796 return ret;
1797 }
1798
1799 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1800 {
1801 int err;
1802 struct p9_req_t *req;
1803 struct p9_client *clnt;
1804
1805 err = 0;
1806 clnt = fid->clnt;
1807 wst->size = p9_client_statsize(wst, clnt->proto_version);
1808 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1809 p9_debug(P9_DEBUG_9P,
1810 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1811 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1812 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1813 " uid=%d gid=%d n_muid=%d\n",
1814 wst->size, wst->type, wst->dev, wst->qid.type,
1815 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1816 wst->atime, wst->mtime, (unsigned long long)wst->length,
1817 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1818 from_kuid(&init_user_ns, wst->n_uid),
1819 from_kgid(&init_user_ns, wst->n_gid),
1820 from_kuid(&init_user_ns, wst->n_muid));
1821
1822 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1823 if (IS_ERR(req)) {
1824 err = PTR_ERR(req);
1825 goto error;
1826 }
1827
1828 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1829
1830 p9_free_req(clnt, req);
1831 error:
1832 return err;
1833 }
1834 EXPORT_SYMBOL(p9_client_wstat);
1835
1836 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1837 {
1838 int err;
1839 struct p9_req_t *req;
1840 struct p9_client *clnt;
1841
1842 err = 0;
1843 clnt = fid->clnt;
1844 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1845 p9_debug(P9_DEBUG_9P,
1846 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1847 " atime_sec=%lld atime_nsec=%lld\n"
1848 " mtime_sec=%lld mtime_nsec=%lld\n",
1849 p9attr->valid, p9attr->mode,
1850 from_kuid(&init_user_ns, p9attr->uid),
1851 from_kgid(&init_user_ns, p9attr->gid),
1852 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1853 p9attr->mtime_sec, p9attr->mtime_nsec);
1854
1855 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1856
1857 if (IS_ERR(req)) {
1858 err = PTR_ERR(req);
1859 goto error;
1860 }
1861 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1862 p9_free_req(clnt, req);
1863 error:
1864 return err;
1865 }
1866 EXPORT_SYMBOL(p9_client_setattr);
1867
1868 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1869 {
1870 int err;
1871 struct p9_req_t *req;
1872 struct p9_client *clnt;
1873
1874 err = 0;
1875 clnt = fid->clnt;
1876
1877 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1878
1879 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1880 if (IS_ERR(req)) {
1881 err = PTR_ERR(req);
1882 goto error;
1883 }
1884
1885 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1886 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1887 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1888 if (err) {
1889 trace_9p_protocol_dump(clnt, req->rc);
1890 p9_free_req(clnt, req);
1891 goto error;
1892 }
1893
1894 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1895 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1896 "fsid %llu namelen %ld\n",
1897 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1898 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1899 sb->fsid, (long int)sb->namelen);
1900
1901 p9_free_req(clnt, req);
1902 error:
1903 return err;
1904 }
1905 EXPORT_SYMBOL(p9_client_statfs);
1906
1907 int p9_client_rename(struct p9_fid *fid,
1908 struct p9_fid *newdirfid, const char *name)
1909 {
1910 int err;
1911 struct p9_req_t *req;
1912 struct p9_client *clnt;
1913
1914 err = 0;
1915 clnt = fid->clnt;
1916
1917 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1918 fid->fid, newdirfid->fid, name);
1919
1920 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1921 newdirfid->fid, name);
1922 if (IS_ERR(req)) {
1923 err = PTR_ERR(req);
1924 goto error;
1925 }
1926
1927 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1928
1929 p9_free_req(clnt, req);
1930 error:
1931 return err;
1932 }
1933 EXPORT_SYMBOL(p9_client_rename);
1934
1935 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1936 struct p9_fid *newdirfid, const char *new_name)
1937 {
1938 int err;
1939 struct p9_req_t *req;
1940 struct p9_client *clnt;
1941
1942 err = 0;
1943 clnt = olddirfid->clnt;
1944
1945 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1946 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1947 newdirfid->fid, new_name);
1948
1949 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1950 old_name, newdirfid->fid, new_name);
1951 if (IS_ERR(req)) {
1952 err = PTR_ERR(req);
1953 goto error;
1954 }
1955
1956 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1957 newdirfid->fid, new_name);
1958
1959 p9_free_req(clnt, req);
1960 error:
1961 return err;
1962 }
1963 EXPORT_SYMBOL(p9_client_renameat);
1964
1965 /*
1966 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1967 */
1968 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1969 const char *attr_name, u64 *attr_size)
1970 {
1971 int err;
1972 struct p9_req_t *req;
1973 struct p9_client *clnt;
1974 struct p9_fid *attr_fid;
1975
1976 err = 0;
1977 clnt = file_fid->clnt;
1978 attr_fid = p9_fid_create(clnt);
1979 if (IS_ERR(attr_fid)) {
1980 err = PTR_ERR(attr_fid);
1981 attr_fid = NULL;
1982 goto error;
1983 }
1984 p9_debug(P9_DEBUG_9P,
1985 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
1986 file_fid->fid, attr_fid->fid, attr_name);
1987
1988 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
1989 file_fid->fid, attr_fid->fid, attr_name);
1990 if (IS_ERR(req)) {
1991 err = PTR_ERR(req);
1992 goto error;
1993 }
1994 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
1995 if (err) {
1996 trace_9p_protocol_dump(clnt, req->rc);
1997 p9_free_req(clnt, req);
1998 goto clunk_fid;
1999 }
2000 p9_free_req(clnt, req);
2001 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2002 attr_fid->fid, *attr_size);
2003 return attr_fid;
2004 clunk_fid:
2005 p9_client_clunk(attr_fid);
2006 attr_fid = NULL;
2007 error:
2008 if (attr_fid && (attr_fid != file_fid))
2009 p9_fid_destroy(attr_fid);
2010
2011 return ERR_PTR(err);
2012 }
2013 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2014
2015 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2016 u64 attr_size, int flags)
2017 {
2018 int err;
2019 struct p9_req_t *req;
2020 struct p9_client *clnt;
2021
2022 p9_debug(P9_DEBUG_9P,
2023 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2024 fid->fid, name, (long long)attr_size, flags);
2025 err = 0;
2026 clnt = fid->clnt;
2027 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2028 fid->fid, name, attr_size, flags);
2029 if (IS_ERR(req)) {
2030 err = PTR_ERR(req);
2031 goto error;
2032 }
2033 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2034 p9_free_req(clnt, req);
2035 error:
2036 return err;
2037 }
2038 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2039
2040 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2041 {
2042 int err, rsize, non_zc = 0;
2043 struct p9_client *clnt;
2044 struct p9_req_t *req;
2045 char *dataptr;
2046
2047 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2048 fid->fid, (unsigned long long) offset, count);
2049
2050 err = 0;
2051 clnt = fid->clnt;
2052
2053 rsize = fid->iounit;
2054 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2055 rsize = clnt->msize - P9_READDIRHDRSZ;
2056
2057 if (count < rsize)
2058 rsize = count;
2059
2060 /* Don't bother zerocopy for small IO (< 1024) */
2061 if (clnt->trans_mod->zc_request && rsize > 1024) {
2062 /*
2063 * response header len is 11
2064 * PDU Header(7) + IO Size (4)
2065 */
2066 req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0,
2067 11, 1, "dqd", fid->fid, offset, rsize);
2068 } else {
2069 non_zc = 1;
2070 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2071 offset, rsize);
2072 }
2073 if (IS_ERR(req)) {
2074 err = PTR_ERR(req);
2075 goto error;
2076 }
2077
2078 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2079 if (err) {
2080 trace_9p_protocol_dump(clnt, req->rc);
2081 goto free_and_error;
2082 }
2083
2084 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2085
2086 if (non_zc)
2087 memmove(data, dataptr, count);
2088
2089 p9_free_req(clnt, req);
2090 return count;
2091
2092 free_and_error:
2093 p9_free_req(clnt, req);
2094 error:
2095 return err;
2096 }
2097 EXPORT_SYMBOL(p9_client_readdir);
2098
2099 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
2100 dev_t rdev, kgid_t gid, struct p9_qid *qid)
2101 {
2102 int err;
2103 struct p9_client *clnt;
2104 struct p9_req_t *req;
2105
2106 err = 0;
2107 clnt = fid->clnt;
2108 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2109 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2110 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2111 MAJOR(rdev), MINOR(rdev), gid);
2112 if (IS_ERR(req))
2113 return PTR_ERR(req);
2114
2115 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2116 if (err) {
2117 trace_9p_protocol_dump(clnt, req->rc);
2118 goto error;
2119 }
2120 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2121 (unsigned long long)qid->path, qid->version);
2122
2123 error:
2124 p9_free_req(clnt, req);
2125 return err;
2126
2127 }
2128 EXPORT_SYMBOL(p9_client_mknod_dotl);
2129
2130 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
2131 kgid_t gid, struct p9_qid *qid)
2132 {
2133 int err;
2134 struct p9_client *clnt;
2135 struct p9_req_t *req;
2136
2137 err = 0;
2138 clnt = fid->clnt;
2139 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2140 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2141 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
2142 gid);
2143 if (IS_ERR(req))
2144 return PTR_ERR(req);
2145
2146 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2147 if (err) {
2148 trace_9p_protocol_dump(clnt, req->rc);
2149 goto error;
2150 }
2151 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2152 (unsigned long long)qid->path, qid->version);
2153
2154 error:
2155 p9_free_req(clnt, req);
2156 return err;
2157
2158 }
2159 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2160
2161 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2162 {
2163 int err;
2164 struct p9_client *clnt;
2165 struct p9_req_t *req;
2166
2167 err = 0;
2168 clnt = fid->clnt;
2169 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2170 "start %lld length %lld proc_id %d client_id %s\n",
2171 fid->fid, flock->type, flock->flags, flock->start,
2172 flock->length, flock->proc_id, flock->client_id);
2173
2174 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2175 flock->flags, flock->start, flock->length,
2176 flock->proc_id, flock->client_id);
2177
2178 if (IS_ERR(req))
2179 return PTR_ERR(req);
2180
2181 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2182 if (err) {
2183 trace_9p_protocol_dump(clnt, req->rc);
2184 goto error;
2185 }
2186 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2187 error:
2188 p9_free_req(clnt, req);
2189 return err;
2190
2191 }
2192 EXPORT_SYMBOL(p9_client_lock_dotl);
2193
2194 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2195 {
2196 int err;
2197 struct p9_client *clnt;
2198 struct p9_req_t *req;
2199
2200 err = 0;
2201 clnt = fid->clnt;
2202 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2203 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2204 glock->start, glock->length, glock->proc_id, glock->client_id);
2205
2206 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2207 glock->start, glock->length, glock->proc_id, glock->client_id);
2208
2209 if (IS_ERR(req))
2210 return PTR_ERR(req);
2211
2212 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2213 &glock->start, &glock->length, &glock->proc_id,
2214 &glock->client_id);
2215 if (err) {
2216 trace_9p_protocol_dump(clnt, req->rc);
2217 goto error;
2218 }
2219 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2220 "proc_id %d client_id %s\n", glock->type, glock->start,
2221 glock->length, glock->proc_id, glock->client_id);
2222 error:
2223 p9_free_req(clnt, req);
2224 return err;
2225 }
2226 EXPORT_SYMBOL(p9_client_getlock_dotl);
2227
2228 int p9_client_readlink(struct p9_fid *fid, char **target)
2229 {
2230 int err;
2231 struct p9_client *clnt;
2232 struct p9_req_t *req;
2233
2234 err = 0;
2235 clnt = fid->clnt;
2236 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2237
2238 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2239 if (IS_ERR(req))
2240 return PTR_ERR(req);
2241
2242 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2243 if (err) {
2244 trace_9p_protocol_dump(clnt, req->rc);
2245 goto error;
2246 }
2247 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2248 error:
2249 p9_free_req(clnt, req);
2250 return err;
2251 }
2252 EXPORT_SYMBOL(p9_client_readlink);
kernel source for telekom puls (alcatel/mediatek)