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 <linux/uio.h>
38 #include <net/9p/9p.h>
39 #include <linux/parser.h>
40 #include <net/9p/client.h>
41 #include <net/9p/transport.h>
42 #include "protocol.h"
43
44 #define CREATE_TRACE_POINTS
45 #include <trace/events/9p.h>
46
47 /*
48 * Client Option Parsing (code inspired by NFS code)
49 * - a little lazy - parse all client options
50 */
51
52 enum {
53 Opt_msize,
54 Opt_trans,
55 Opt_legacy,
56 Opt_version,
57 Opt_err,
58 };
59
60 static const match_table_t tokens = {
61 {Opt_msize, "msize=%u"},
62 {Opt_legacy, "noextend"},
63 {Opt_trans, "trans=%s"},
64 {Opt_version, "version=%s"},
65 {Opt_err, NULL},
66 };
67
68 inline int p9_is_proto_dotl(struct p9_client *clnt)
69 {
70 return clnt->proto_version == p9_proto_2000L;
71 }
72 EXPORT_SYMBOL(p9_is_proto_dotl);
73
74 inline int p9_is_proto_dotu(struct p9_client *clnt)
75 {
76 return clnt->proto_version == p9_proto_2000u;
77 }
78 EXPORT_SYMBOL(p9_is_proto_dotu);
79
80 /*
81 * Some error codes are taken directly from the server replies,
82 * make sure they are valid.
83 */
84 static int safe_errno(int err)
85 {
86 if ((err > 0) || (err < -MAX_ERRNO)) {
87 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err);
88 return -EPROTO;
89 }
90 return err;
91 }
92
93
94 /* Interpret mount option for protocol version */
95 static int get_protocol_version(char *s)
96 {
97 int version = -EINVAL;
98
99 if (!strcmp(s, "9p2000")) {
100 version = p9_proto_legacy;
101 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n");
102 } else if (!strcmp(s, "9p2000.u")) {
103 version = p9_proto_2000u;
104 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
105 } else if (!strcmp(s, "9p2000.L")) {
106 version = p9_proto_2000L;
107 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
108 } else
109 pr_info("Unknown protocol version %s\n", s);
110
111 return version;
112 }
113
114 /**
115 * parse_options - parse mount options into client structure
116 * @opts: options string passed from mount
117 * @clnt: existing v9fs client information
118 *
119 * Return 0 upon success, -ERRNO upon failure
120 */
121
122 static int parse_opts(char *opts, struct p9_client *clnt)
123 {
124 char *options, *tmp_options;
125 char *p;
126 substring_t args[MAX_OPT_ARGS];
127 int option;
128 char *s;
129 int ret = 0;
130
131 clnt->proto_version = p9_proto_2000L;
132 clnt->msize = 8192;
133
134 if (!opts)
135 return 0;
136
137 tmp_options = kstrdup(opts, GFP_KERNEL);
138 if (!tmp_options) {
139 p9_debug(P9_DEBUG_ERROR,
140 "failed to allocate copy of option string\n");
141 return -ENOMEM;
142 }
143 options = tmp_options;
144
145 while ((p = strsep(&options, ",")) != NULL) {
146 int token, r;
147 if (!*p)
148 continue;
149 token = match_token(p, tokens, args);
150 switch (token) {
151 case Opt_msize:
152 r = match_int(&args[0], &option);
153 if (r < 0) {
154 p9_debug(P9_DEBUG_ERROR,
155 "integer field, but no integer?\n");
156 ret = r;
157 continue;
158 }
159 clnt->msize = option;
160 break;
161 case Opt_trans:
162 s = match_strdup(&args[0]);
163 if (!s) {
164 ret = -ENOMEM;
165 p9_debug(P9_DEBUG_ERROR,
166 "problem allocating copy of trans arg\n");
167 goto free_and_return;
168 }
169 clnt->trans_mod = v9fs_get_trans_by_name(s);
170 if (clnt->trans_mod == NULL) {
171 pr_info("Could not find request transport: %s\n",
172 s);
173 ret = -EINVAL;
174 kfree(s);
175 goto free_and_return;
176 }
177 kfree(s);
178 break;
179 case Opt_legacy:
180 clnt->proto_version = p9_proto_legacy;
181 break;
182 case Opt_version:
183 s = match_strdup(&args[0]);
184 if (!s) {
185 ret = -ENOMEM;
186 p9_debug(P9_DEBUG_ERROR,
187 "problem allocating copy of version arg\n");
188 goto free_and_return;
189 }
190 ret = get_protocol_version(s);
191 if (ret == -EINVAL) {
192 kfree(s);
193 goto free_and_return;
194 }
195 kfree(s);
196 clnt->proto_version = ret;
197 break;
198 default:
199 continue;
200 }
201 }
202
203 free_and_return:
204 kfree(tmp_options);
205 return ret;
206 }
207
208 static struct p9_fcall *p9_fcall_alloc(int alloc_msize)
209 {
210 struct p9_fcall *fc;
211 fc = kmalloc(sizeof(struct p9_fcall) + alloc_msize, GFP_NOFS);
212 if (!fc)
213 return NULL;
214 fc->capacity = alloc_msize;
215 fc->sdata = (char *) fc + sizeof(struct p9_fcall);
216 return fc;
217 }
218
219 /**
220 * p9_tag_alloc - lookup/allocate a request by tag
221 * @c: client session to lookup tag within
222 * @tag: numeric id for transaction
223 *
224 * this is a simple array lookup, but will grow the
225 * request_slots as necessary to accommodate transaction
226 * ids which did not previously have a slot.
227 *
228 * this code relies on the client spinlock to manage locks, its
229 * possible we should switch to something else, but I'd rather
230 * stick with something low-overhead for the common case.
231 *
232 */
233
234 static struct p9_req_t *
235 p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
236 {
237 unsigned long flags;
238 int row, col;
239 struct p9_req_t *req;
240 int alloc_msize = min(c->msize, max_size);
241
242 /* This looks up the original request by tag so we know which
243 * buffer to read the data into */
244 tag++;
245
246 if (tag >= c->max_tag) {
247 spin_lock_irqsave(&c->lock, flags);
248 /* check again since original check was outside of lock */
249 while (tag >= c->max_tag) {
250 row = (tag / P9_ROW_MAXTAG);
251 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
252 sizeof(struct p9_req_t), GFP_ATOMIC);
253
254 if (!c->reqs[row]) {
255 pr_err("Couldn't grow tag array\n");
256 spin_unlock_irqrestore(&c->lock, flags);
257 return ERR_PTR(-ENOMEM);
258 }
259 for (col = 0; col < P9_ROW_MAXTAG; col++) {
260 c->reqs[row][col].status = REQ_STATUS_IDLE;
261 c->reqs[row][col].tc = NULL;
262 }
263 c->max_tag += P9_ROW_MAXTAG;
264 }
265 spin_unlock_irqrestore(&c->lock, flags);
266 }
267 row = tag / P9_ROW_MAXTAG;
268 col = tag % P9_ROW_MAXTAG;
269
270 req = &c->reqs[row][col];
271 if (!req->wq) {
272 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
273 if (!req->wq)
274 goto grow_failed;
275 init_waitqueue_head(req->wq);
276 }
277
278 if (!req->tc)
279 req->tc = p9_fcall_alloc(alloc_msize);
280 if (!req->rc)
281 req->rc = p9_fcall_alloc(alloc_msize);
282 if (!req->tc || !req->rc)
283 goto grow_failed;
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 req;
292
293 grow_failed:
294 pr_err("Couldn't grow tag array\n");
295 kfree(req->tc);
296 kfree(req->rc);
297 kfree(req->wq);
298 req->tc = req->rc = NULL;
299 req->wq = NULL;
300 return ERR_PTR(-ENOMEM);
301 }
302
303 /**
304 * p9_tag_lookup - lookup a request by tag
305 * @c: client session to lookup tag within
306 * @tag: numeric id for transaction
307 *
308 */
309
310 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
311 {
312 int row, col;
313
314 /* This looks up the original request by tag so we know which
315 * buffer to read the data into */
316 tag++;
317
318 if(tag >= c->max_tag)
319 return NULL;
320
321 row = tag / P9_ROW_MAXTAG;
322 col = tag % P9_ROW_MAXTAG;
323
324 return &c->reqs[row][col];
325 }
326 EXPORT_SYMBOL(p9_tag_lookup);
327
328 /**
329 * p9_tag_init - setup tags structure and contents
330 * @c: v9fs client struct
331 *
332 * This initializes the tags structure for each client instance.
333 *
334 */
335
336 static int p9_tag_init(struct p9_client *c)
337 {
338 int err = 0;
339
340 c->tagpool = p9_idpool_create();
341 if (IS_ERR(c->tagpool)) {
342 err = PTR_ERR(c->tagpool);
343 goto error;
344 }
345 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
346 if (err < 0) {
347 p9_idpool_destroy(c->tagpool);
348 goto error;
349 }
350 c->max_tag = 0;
351 error:
352 return err;
353 }
354
355 /**
356 * p9_tag_cleanup - cleans up tags structure and reclaims resources
357 * @c: v9fs client struct
358 *
359 * This frees resources associated with the tags structure
360 *
361 */
362 static void p9_tag_cleanup(struct p9_client *c)
363 {
364 int row, col;
365
366 /* check to insure all requests are idle */
367 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
368 for (col = 0; col < P9_ROW_MAXTAG; col++) {
369 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
370 p9_debug(P9_DEBUG_MUX,
371 "Attempting to cleanup non-free tag %d,%d\n",
372 row, col);
373 /* TODO: delay execution of cleanup */
374 return;
375 }
376 }
377 }
378
379 if (c->tagpool) {
380 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
381 p9_idpool_destroy(c->tagpool);
382 }
383
384 /* free requests associated with tags */
385 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
386 for (col = 0; col < P9_ROW_MAXTAG; col++) {
387 kfree(c->reqs[row][col].wq);
388 kfree(c->reqs[row][col].tc);
389 kfree(c->reqs[row][col].rc);
390 }
391 kfree(c->reqs[row]);
392 }
393 c->max_tag = 0;
394 }
395
396 /**
397 * p9_free_req - free a request and clean-up as necessary
398 * c: client state
399 * r: request to release
400 *
401 */
402
403 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
404 {
405 int tag = r->tc->tag;
406 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
407
408 r->status = REQ_STATUS_IDLE;
409 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
410 p9_idpool_put(tag, c->tagpool);
411 }
412
413 /**
414 * p9_client_cb - call back from transport to client
415 * c: client state
416 * req: request received
417 *
418 */
419 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status)
420 {
421 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
422
423 /*
424 * This barrier is needed to make sure any change made to req before
425 * the other thread wakes up will indeed be seen by the waiting side.
426 */
427 smp_wmb();
428 req->status = status;
429
430 wake_up(req->wq);
431 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
432 }
433 EXPORT_SYMBOL(p9_client_cb);
434
435 /**
436 * p9_parse_header - parse header arguments out of a packet
437 * @pdu: packet to parse
438 * @size: size of packet
439 * @type: type of request
440 * @tag: tag of packet
441 * @rewind: set if we need to rewind offset afterwards
442 */
443
444 int
445 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
446 int rewind)
447 {
448 int8_t r_type;
449 int16_t r_tag;
450 int32_t r_size;
451 int offset = pdu->offset;
452 int err;
453
454 pdu->offset = 0;
455 if (pdu->size == 0)
456 pdu->size = 7;
457
458 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
459 if (err)
460 goto rewind_and_exit;
461
462 pdu->size = r_size;
463 pdu->id = r_type;
464 pdu->tag = r_tag;
465
466 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
467 pdu->size, pdu->id, pdu->tag);
468
469 if (type)
470 *type = r_type;
471 if (tag)
472 *tag = r_tag;
473 if (size)
474 *size = r_size;
475
476
477 rewind_and_exit:
478 if (rewind)
479 pdu->offset = offset;
480 return err;
481 }
482 EXPORT_SYMBOL(p9_parse_header);
483
484 /**
485 * p9_check_errors - check 9p packet for error return and process it
486 * @c: current client instance
487 * @req: request to parse and check for error conditions
488 *
489 * returns error code if one is discovered, otherwise returns 0
490 *
491 * this will have to be more complicated if we have multiple
492 * error packet types
493 */
494
495 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
496 {
497 int8_t type;
498 int err;
499 int ecode;
500
501 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
502 /*
503 * dump the response from server
504 * This should be after check errors which poplulate pdu_fcall.
505 */
506 trace_9p_protocol_dump(c, req->rc);
507 if (err) {
508 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
509 return err;
510 }
511 if (type != P9_RERROR && type != P9_RLERROR)
512 return 0;
513
514 if (!p9_is_proto_dotl(c)) {
515 char *ename;
516 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
517 &ename, &ecode);
518 if (err)
519 goto out_err;
520
521 if (p9_is_proto_dotu(c) && ecode < 512)
522 err = -ecode;
523
524 if (!err) {
525 err = p9_errstr2errno(ename, strlen(ename));
526
527 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
528 -ecode, ename);
529 }
530 kfree(ename);
531 } else {
532 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
533 err = -ecode;
534
535 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
536 }
537
538 return err;
539
540 out_err:
541 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
542
543 return err;
544 }
545
546 /**
547 * p9_check_zc_errors - check 9p packet for error return and process it
548 * @c: current client instance
549 * @req: request to parse and check for error conditions
550 * @in_hdrlen: Size of response protocol buffer.
551 *
552 * returns error code if one is discovered, otherwise returns 0
553 *
554 * this will have to be more complicated if we have multiple
555 * error packet types
556 */
557
558 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
559 struct iov_iter *uidata, int in_hdrlen)
560 {
561 int err;
562 int ecode;
563 int8_t type;
564 char *ename = NULL;
565
566 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
567 /*
568 * dump the response from server
569 * This should be after parse_header which poplulate pdu_fcall.
570 */
571 trace_9p_protocol_dump(c, req->rc);
572 if (err) {
573 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
574 return err;
575 }
576
577 if (type != P9_RERROR && type != P9_RLERROR)
578 return 0;
579
580 if (!p9_is_proto_dotl(c)) {
581 /* Error is reported in string format */
582 int len;
583 /* 7 = header size for RERROR; */
584 int inline_len = in_hdrlen - 7;
585
586 len = req->rc->size - req->rc->offset;
587 if (len > (P9_ZC_HDR_SZ - 7)) {
588 err = -EFAULT;
589 goto out_err;
590 }
591
592 ename = &req->rc->sdata[req->rc->offset];
593 if (len > inline_len) {
594 /* We have error in external buffer */
595 err = copy_from_iter(ename + inline_len,
596 len - inline_len, uidata);
597 if (err != len - inline_len) {
598 err = -EFAULT;
599 goto out_err;
600 }
601 }
602 ename = NULL;
603 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
604 &ename, &ecode);
605 if (err)
606 goto out_err;
607
608 if (p9_is_proto_dotu(c) && ecode < 512)
609 err = -ecode;
610
611 if (!err) {
612 err = p9_errstr2errno(ename, strlen(ename));
613
614 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
615 -ecode, ename);
616 }
617 kfree(ename);
618 } else {
619 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
620 err = -ecode;
621
622 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
623 }
624 return err;
625
626 out_err:
627 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
628 return err;
629 }
630
631 static struct p9_req_t *
632 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
633
634 /**
635 * p9_client_flush - flush (cancel) a request
636 * @c: client state
637 * @oldreq: request to cancel
638 *
639 * This sents a flush for a particular request and links
640 * the flush request to the original request. The current
641 * code only supports a single flush request although the protocol
642 * allows for multiple flush requests to be sent for a single request.
643 *
644 */
645
646 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
647 {
648 struct p9_req_t *req;
649 int16_t oldtag;
650 int err;
651
652 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
653 if (err)
654 return err;
655
656 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
657
658 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
659 if (IS_ERR(req))
660 return PTR_ERR(req);
661
662 /*
663 * if we haven't received a response for oldreq,
664 * remove it from the list
665 */
666 if (oldreq->status == REQ_STATUS_SENT)
667 if (c->trans_mod->cancelled)
668 c->trans_mod->cancelled(c, oldreq);
669
670 p9_free_req(c, req);
671 return 0;
672 }
673
674 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
675 int8_t type, int req_size,
676 const char *fmt, va_list ap)
677 {
678 int tag, err;
679 struct p9_req_t *req;
680
681 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
682
683 /* we allow for any status other than disconnected */
684 if (c->status == Disconnected)
685 return ERR_PTR(-EIO);
686
687 /* if status is begin_disconnected we allow only clunk request */
688 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
689 return ERR_PTR(-EIO);
690
691 tag = P9_NOTAG;
692 if (type != P9_TVERSION) {
693 tag = p9_idpool_get(c->tagpool);
694 if (tag < 0)
695 return ERR_PTR(-ENOMEM);
696 }
697
698 req = p9_tag_alloc(c, tag, req_size);
699 if (IS_ERR(req))
700 return req;
701
702 /* marshall the data */
703 p9pdu_prepare(req->tc, tag, type);
704 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
705 if (err)
706 goto reterr;
707 p9pdu_finalize(c, req->tc);
708 trace_9p_client_req(c, type, tag);
709 return req;
710 reterr:
711 p9_free_req(c, req);
712 return ERR_PTR(err);
713 }
714
715 /**
716 * p9_client_rpc - issue a request and wait for a response
717 * @c: client session
718 * @type: type of request
719 * @fmt: protocol format string (see protocol.c)
720 *
721 * Returns request structure (which client must free using p9_free_req)
722 */
723
724 static struct p9_req_t *
725 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
726 {
727 va_list ap;
728 int sigpending, err;
729 unsigned long flags;
730 struct p9_req_t *req;
731
732 va_start(ap, fmt);
733 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
734 va_end(ap);
735 if (IS_ERR(req))
736 return req;
737
738 if (signal_pending(current)) {
739 sigpending = 1;
740 clear_thread_flag(TIF_SIGPENDING);
741 } else
742 sigpending = 0;
743
744 err = c->trans_mod->request(c, req);
745 if (err < 0) {
746 if (err != -ERESTARTSYS && err != -EFAULT)
747 c->status = Disconnected;
748 goto reterr;
749 }
750 again:
751 /* Wait for the response */
752 err = wait_event_interruptible(*req->wq,
753 req->status >= REQ_STATUS_RCVD);
754
755 /*
756 * Make sure our req is coherent with regard to updates in other
757 * threads - echoes to wmb() in the callback
758 */
759 smp_rmb();
760
761 if ((err == -ERESTARTSYS) && (c->status == Connected)
762 && (type == P9_TFLUSH)) {
763 sigpending = 1;
764 clear_thread_flag(TIF_SIGPENDING);
765 goto again;
766 }
767
768 if (req->status == REQ_STATUS_ERROR) {
769 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
770 err = req->t_err;
771 }
772 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
773 p9_debug(P9_DEBUG_MUX, "flushing\n");
774 sigpending = 1;
775 clear_thread_flag(TIF_SIGPENDING);
776
777 if (c->trans_mod->cancel(c, req))
778 p9_client_flush(c, req);
779
780 /* if we received the response anyway, don't signal error */
781 if (req->status == REQ_STATUS_RCVD)
782 err = 0;
783 }
784 if (sigpending) {
785 spin_lock_irqsave(¤t->sighand->siglock, flags);
786 recalc_sigpending();
787 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
788 }
789 if (err < 0)
790 goto reterr;
791
792 err = p9_check_errors(c, req);
793 trace_9p_client_res(c, type, req->rc->tag, err);
794 if (!err)
795 return req;
796 reterr:
797 p9_free_req(c, req);
798 return ERR_PTR(safe_errno(err));
799 }
800
801 /**
802 * p9_client_zc_rpc - issue a request and wait for a response
803 * @c: client session
804 * @type: type of request
805 * @uidata: destination for zero copy read
806 * @uodata: source for zero copy write
807 * @inlen: read buffer size
808 * @olen: write buffer size
809 * @hdrlen: reader header size, This is the size of response protocol data
810 * @fmt: protocol format string (see protocol.c)
811 *
812 * Returns request structure (which client must free using p9_free_req)
813 */
814 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
815 struct iov_iter *uidata,
816 struct iov_iter *uodata,
817 int inlen, int olen, int in_hdrlen,
818 const char *fmt, ...)
819 {
820 va_list ap;
821 int sigpending, err;
822 unsigned long flags;
823 struct p9_req_t *req;
824
825 va_start(ap, fmt);
826 /*
827 * We allocate a inline protocol data of only 4k bytes.
828 * The actual content is passed in zero-copy fashion.
829 */
830 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
831 va_end(ap);
832 if (IS_ERR(req))
833 return req;
834
835 if (signal_pending(current)) {
836 sigpending = 1;
837 clear_thread_flag(TIF_SIGPENDING);
838 } else
839 sigpending = 0;
840
841 err = c->trans_mod->zc_request(c, req, uidata, uodata,
842 inlen, olen, in_hdrlen);
843 if (err < 0) {
844 if (err == -EIO)
845 c->status = Disconnected;
846 if (err != -ERESTARTSYS)
847 goto reterr;
848 }
849 if (req->status == REQ_STATUS_ERROR) {
850 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
851 err = req->t_err;
852 }
853 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
854 p9_debug(P9_DEBUG_MUX, "flushing\n");
855 sigpending = 1;
856 clear_thread_flag(TIF_SIGPENDING);
857
858 if (c->trans_mod->cancel(c, req))
859 p9_client_flush(c, req);
860
861 /* if we received the response anyway, don't signal error */
862 if (req->status == REQ_STATUS_RCVD)
863 err = 0;
864 }
865 if (sigpending) {
866 spin_lock_irqsave(¤t->sighand->siglock, flags);
867 recalc_sigpending();
868 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
869 }
870 if (err < 0)
871 goto reterr;
872
873 err = p9_check_zc_errors(c, req, uidata, in_hdrlen);
874 trace_9p_client_res(c, type, req->rc->tag, err);
875 if (!err)
876 return req;
877 reterr:
878 p9_free_req(c, req);
879 return ERR_PTR(safe_errno(err));
880 }
881
882 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
883 {
884 int ret;
885 struct p9_fid *fid;
886 unsigned long flags;
887
888 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
889 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
890 if (!fid)
891 return ERR_PTR(-ENOMEM);
892
893 ret = p9_idpool_get(clnt->fidpool);
894 if (ret < 0) {
895 ret = -ENOSPC;
896 goto error;
897 }
898 fid->fid = ret;
899
900 memset(&fid->qid, 0, sizeof(struct p9_qid));
901 fid->mode = -1;
902 fid->uid = current_fsuid();
903 fid->clnt = clnt;
904 fid->rdir = NULL;
905 spin_lock_irqsave(&clnt->lock, flags);
906 list_add(&fid->flist, &clnt->fidlist);
907 spin_unlock_irqrestore(&clnt->lock, flags);
908
909 return fid;
910
911 error:
912 kfree(fid);
913 return ERR_PTR(ret);
914 }
915
916 static void p9_fid_destroy(struct p9_fid *fid)
917 {
918 struct p9_client *clnt;
919 unsigned long flags;
920
921 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
922 clnt = fid->clnt;
923 p9_idpool_put(fid->fid, clnt->fidpool);
924 spin_lock_irqsave(&clnt->lock, flags);
925 list_del(&fid->flist);
926 spin_unlock_irqrestore(&clnt->lock, flags);
927 kfree(fid->rdir);
928 kfree(fid);
929 }
930
931 static int p9_client_version(struct p9_client *c)
932 {
933 int err = 0;
934 struct p9_req_t *req;
935 char *version;
936 int msize;
937
938 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
939 c->msize, c->proto_version);
940
941 switch (c->proto_version) {
942 case p9_proto_2000L:
943 req = p9_client_rpc(c, P9_TVERSION, "ds",
944 c->msize, "9P2000.L");
945 break;
946 case p9_proto_2000u:
947 req = p9_client_rpc(c, P9_TVERSION, "ds",
948 c->msize, "9P2000.u");
949 break;
950 case p9_proto_legacy:
951 req = p9_client_rpc(c, P9_TVERSION, "ds",
952 c->msize, "9P2000");
953 break;
954 default:
955 return -EINVAL;
956 }
957
958 if (IS_ERR(req))
959 return PTR_ERR(req);
960
961 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
962 if (err) {
963 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
964 trace_9p_protocol_dump(c, req->rc);
965 goto error;
966 }
967
968 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
969 if (!strncmp(version, "9P2000.L", 8))
970 c->proto_version = p9_proto_2000L;
971 else if (!strncmp(version, "9P2000.u", 8))
972 c->proto_version = p9_proto_2000u;
973 else if (!strncmp(version, "9P2000", 6))
974 c->proto_version = p9_proto_legacy;
975 else {
976 err = -EREMOTEIO;
977 goto error;
978 }
979
980 if (msize < c->msize)
981 c->msize = msize;
982
983 error:
984 kfree(version);
985 p9_free_req(c, req);
986
987 return err;
988 }
989
990 struct p9_client *p9_client_create(const char *dev_name, char *options)
991 {
992 int err;
993 struct p9_client *clnt;
994 char *client_id;
995
996 err = 0;
997 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
998 if (!clnt)
999 return ERR_PTR(-ENOMEM);
1000
1001 clnt->trans_mod = NULL;
1002 clnt->trans = NULL;
1003
1004 client_id = utsname()->nodename;
1005 memcpy(clnt->name, client_id, strlen(client_id) + 1);
1006
1007 spin_lock_init(&clnt->lock);
1008 INIT_LIST_HEAD(&clnt->fidlist);
1009
1010 err = p9_tag_init(clnt);
1011 if (err < 0)
1012 goto free_client;
1013
1014 err = parse_opts(options, clnt);
1015 if (err < 0)
1016 goto destroy_tagpool;
1017
1018 if (!clnt->trans_mod)
1019 clnt->trans_mod = v9fs_get_default_trans();
1020
1021 if (clnt->trans_mod == NULL) {
1022 err = -EPROTONOSUPPORT;
1023 p9_debug(P9_DEBUG_ERROR,
1024 "No transport defined or default transport\n");
1025 goto destroy_tagpool;
1026 }
1027
1028 clnt->fidpool = p9_idpool_create();
1029 if (IS_ERR(clnt->fidpool)) {
1030 err = PTR_ERR(clnt->fidpool);
1031 goto put_trans;
1032 }
1033
1034 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1035 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1036
1037 err = clnt->trans_mod->create(clnt, dev_name, options);
1038 if (err)
1039 goto destroy_fidpool;
1040
1041 if (clnt->msize > clnt->trans_mod->maxsize)
1042 clnt->msize = clnt->trans_mod->maxsize;
1043
1044 err = p9_client_version(clnt);
1045 if (err)
1046 goto close_trans;
1047
1048 return clnt;
1049
1050 close_trans:
1051 clnt->trans_mod->close(clnt);
1052 destroy_fidpool:
1053 p9_idpool_destroy(clnt->fidpool);
1054 put_trans:
1055 v9fs_put_trans(clnt->trans_mod);
1056 destroy_tagpool:
1057 p9_idpool_destroy(clnt->tagpool);
1058 free_client:
1059 kfree(clnt);
1060 return ERR_PTR(err);
1061 }
1062 EXPORT_SYMBOL(p9_client_create);
1063
1064 void p9_client_destroy(struct p9_client *clnt)
1065 {
1066 struct p9_fid *fid, *fidptr;
1067
1068 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1069
1070 if (clnt->trans_mod)
1071 clnt->trans_mod->close(clnt);
1072
1073 v9fs_put_trans(clnt->trans_mod);
1074
1075 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
1076 pr_info("Found fid %d not clunked\n", fid->fid);
1077 p9_fid_destroy(fid);
1078 }
1079
1080 if (clnt->fidpool)
1081 p9_idpool_destroy(clnt->fidpool);
1082
1083 p9_tag_cleanup(clnt);
1084
1085 kfree(clnt);
1086 }
1087 EXPORT_SYMBOL(p9_client_destroy);
1088
1089 void p9_client_disconnect(struct p9_client *clnt)
1090 {
1091 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1092 clnt->status = Disconnected;
1093 }
1094 EXPORT_SYMBOL(p9_client_disconnect);
1095
1096 void p9_client_begin_disconnect(struct p9_client *clnt)
1097 {
1098 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1099 clnt->status = BeginDisconnect;
1100 }
1101 EXPORT_SYMBOL(p9_client_begin_disconnect);
1102
1103 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1104 char *uname, kuid_t n_uname, char *aname)
1105 {
1106 int err = 0;
1107 struct p9_req_t *req;
1108 struct p9_fid *fid;
1109 struct p9_qid qid;
1110
1111
1112 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1113 afid ? afid->fid : -1, uname, aname);
1114 fid = p9_fid_create(clnt);
1115 if (IS_ERR(fid)) {
1116 err = PTR_ERR(fid);
1117 fid = NULL;
1118 goto error;
1119 }
1120 fid->uid = n_uname;
1121
1122 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1123 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1124 if (IS_ERR(req)) {
1125 err = PTR_ERR(req);
1126 goto error;
1127 }
1128
1129 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
1130 if (err) {
1131 trace_9p_protocol_dump(clnt, req->rc);
1132 p9_free_req(clnt, req);
1133 goto error;
1134 }
1135
1136 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1137 qid.type, (unsigned long long)qid.path, qid.version);
1138
1139 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1140
1141 p9_free_req(clnt, req);
1142 return fid;
1143
1144 error:
1145 if (fid)
1146 p9_fid_destroy(fid);
1147 return ERR_PTR(err);
1148 }
1149 EXPORT_SYMBOL(p9_client_attach);
1150
1151 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1152 char **wnames, int clone)
1153 {
1154 int err;
1155 struct p9_client *clnt;
1156 struct p9_fid *fid;
1157 struct p9_qid *wqids;
1158 struct p9_req_t *req;
1159 uint16_t nwqids, count;
1160
1161 err = 0;
1162 wqids = NULL;
1163 clnt = oldfid->clnt;
1164 if (clone) {
1165 fid = p9_fid_create(clnt);
1166 if (IS_ERR(fid)) {
1167 err = PTR_ERR(fid);
1168 fid = NULL;
1169 goto error;
1170 }
1171
1172 fid->uid = oldfid->uid;
1173 } else
1174 fid = oldfid;
1175
1176
1177 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1178 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1179
1180 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1181 nwname, wnames);
1182 if (IS_ERR(req)) {
1183 err = PTR_ERR(req);
1184 goto error;
1185 }
1186
1187 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1188 if (err) {
1189 trace_9p_protocol_dump(clnt, req->rc);
1190 p9_free_req(clnt, req);
1191 goto clunk_fid;
1192 }
1193 p9_free_req(clnt, req);
1194
1195 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1196
1197 if (nwqids != nwname) {
1198 err = -ENOENT;
1199 goto clunk_fid;
1200 }
1201
1202 for (count = 0; count < nwqids; count++)
1203 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1204 count, wqids[count].type,
1205 (unsigned long long)wqids[count].path,
1206 wqids[count].version);
1207
1208 if (nwname)
1209 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1210 else
1211 fid->qid = oldfid->qid;
1212
1213 kfree(wqids);
1214 return fid;
1215
1216 clunk_fid:
1217 kfree(wqids);
1218 p9_client_clunk(fid);
1219 fid = NULL;
1220
1221 error:
1222 if (fid && (fid != oldfid))
1223 p9_fid_destroy(fid);
1224
1225 return ERR_PTR(err);
1226 }
1227 EXPORT_SYMBOL(p9_client_walk);
1228
1229 int p9_client_open(struct p9_fid *fid, int mode)
1230 {
1231 int err;
1232 struct p9_client *clnt;
1233 struct p9_req_t *req;
1234 struct p9_qid qid;
1235 int iounit;
1236
1237 clnt = fid->clnt;
1238 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1239 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1240 err = 0;
1241
1242 if (fid->mode != -1)
1243 return -EINVAL;
1244
1245 if (p9_is_proto_dotl(clnt))
1246 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1247 else
1248 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1249 if (IS_ERR(req)) {
1250 err = PTR_ERR(req);
1251 goto error;
1252 }
1253
1254 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1255 if (err) {
1256 trace_9p_protocol_dump(clnt, req->rc);
1257 goto free_and_error;
1258 }
1259
1260 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1261 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1262 (unsigned long long)qid.path, qid.version, iounit);
1263
1264 fid->mode = mode;
1265 fid->iounit = iounit;
1266
1267 free_and_error:
1268 p9_free_req(clnt, req);
1269 error:
1270 return err;
1271 }
1272 EXPORT_SYMBOL(p9_client_open);
1273
1274 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1275 kgid_t gid, struct p9_qid *qid)
1276 {
1277 int err = 0;
1278 struct p9_client *clnt;
1279 struct p9_req_t *req;
1280 int iounit;
1281
1282 p9_debug(P9_DEBUG_9P,
1283 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1284 ofid->fid, name, flags, mode,
1285 from_kgid(&init_user_ns, gid));
1286 clnt = ofid->clnt;
1287
1288 if (ofid->mode != -1)
1289 return -EINVAL;
1290
1291 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1292 mode, gid);
1293 if (IS_ERR(req)) {
1294 err = PTR_ERR(req);
1295 goto error;
1296 }
1297
1298 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1299 if (err) {
1300 trace_9p_protocol_dump(clnt, req->rc);
1301 goto free_and_error;
1302 }
1303
1304 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1305 qid->type,
1306 (unsigned long long)qid->path,
1307 qid->version, iounit);
1308
1309 ofid->mode = mode;
1310 ofid->iounit = iounit;
1311
1312 free_and_error:
1313 p9_free_req(clnt, req);
1314 error:
1315 return err;
1316 }
1317 EXPORT_SYMBOL(p9_client_create_dotl);
1318
1319 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1320 char *extension)
1321 {
1322 int err;
1323 struct p9_client *clnt;
1324 struct p9_req_t *req;
1325 struct p9_qid qid;
1326 int iounit;
1327
1328 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1329 fid->fid, name, perm, mode);
1330 err = 0;
1331 clnt = fid->clnt;
1332
1333 if (fid->mode != -1)
1334 return -EINVAL;
1335
1336 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1337 mode, extension);
1338 if (IS_ERR(req)) {
1339 err = PTR_ERR(req);
1340 goto error;
1341 }
1342
1343 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1344 if (err) {
1345 trace_9p_protocol_dump(clnt, req->rc);
1346 goto free_and_error;
1347 }
1348
1349 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1350 qid.type,
1351 (unsigned long long)qid.path,
1352 qid.version, iounit);
1353
1354 fid->mode = mode;
1355 fid->iounit = iounit;
1356
1357 free_and_error:
1358 p9_free_req(clnt, req);
1359 error:
1360 return err;
1361 }
1362 EXPORT_SYMBOL(p9_client_fcreate);
1363
1364 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, kgid_t gid,
1365 struct p9_qid *qid)
1366 {
1367 int err = 0;
1368 struct p9_client *clnt;
1369 struct p9_req_t *req;
1370
1371 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1372 dfid->fid, name, symtgt);
1373 clnt = dfid->clnt;
1374
1375 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1376 gid);
1377 if (IS_ERR(req)) {
1378 err = PTR_ERR(req);
1379 goto error;
1380 }
1381
1382 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1383 if (err) {
1384 trace_9p_protocol_dump(clnt, req->rc);
1385 goto free_and_error;
1386 }
1387
1388 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1389 qid->type, (unsigned long long)qid->path, qid->version);
1390
1391 free_and_error:
1392 p9_free_req(clnt, req);
1393 error:
1394 return err;
1395 }
1396 EXPORT_SYMBOL(p9_client_symlink);
1397
1398 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1399 {
1400 struct p9_client *clnt;
1401 struct p9_req_t *req;
1402
1403 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1404 dfid->fid, oldfid->fid, newname);
1405 clnt = dfid->clnt;
1406 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1407 newname);
1408 if (IS_ERR(req))
1409 return PTR_ERR(req);
1410
1411 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1412 p9_free_req(clnt, req);
1413 return 0;
1414 }
1415 EXPORT_SYMBOL(p9_client_link);
1416
1417 int p9_client_fsync(struct p9_fid *fid, int datasync)
1418 {
1419 int err;
1420 struct p9_client *clnt;
1421 struct p9_req_t *req;
1422
1423 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1424 fid->fid, datasync);
1425 err = 0;
1426 clnt = fid->clnt;
1427
1428 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1429 if (IS_ERR(req)) {
1430 err = PTR_ERR(req);
1431 goto error;
1432 }
1433
1434 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1435
1436 p9_free_req(clnt, req);
1437
1438 error:
1439 return err;
1440 }
1441 EXPORT_SYMBOL(p9_client_fsync);
1442
1443 int p9_client_clunk(struct p9_fid *fid)
1444 {
1445 int err;
1446 struct p9_client *clnt;
1447 struct p9_req_t *req;
1448 int retries = 0;
1449
1450 if (!fid) {
1451 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1452 __func__, task_pid_nr(current));
1453 dump_stack();
1454 return 0;
1455 }
1456
1457 again:
1458 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1459 retries);
1460 err = 0;
1461 clnt = fid->clnt;
1462
1463 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1464 if (IS_ERR(req)) {
1465 err = PTR_ERR(req);
1466 goto error;
1467 }
1468
1469 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1470
1471 p9_free_req(clnt, req);
1472 error:
1473 /*
1474 * Fid is not valid even after a failed clunk
1475 * If interrupted, retry once then give up and
1476 * leak fid until umount.
1477 */
1478 if (err == -ERESTARTSYS) {
1479 if (retries++ == 0)
1480 goto again;
1481 } else
1482 p9_fid_destroy(fid);
1483 return err;
1484 }
1485 EXPORT_SYMBOL(p9_client_clunk);
1486
1487 int p9_client_remove(struct p9_fid *fid)
1488 {
1489 int err;
1490 struct p9_client *clnt;
1491 struct p9_req_t *req;
1492
1493 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1494 err = 0;
1495 clnt = fid->clnt;
1496
1497 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1498 if (IS_ERR(req)) {
1499 err = PTR_ERR(req);
1500 goto error;
1501 }
1502
1503 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1504
1505 p9_free_req(clnt, req);
1506 error:
1507 if (err == -ERESTARTSYS)
1508 p9_client_clunk(fid);
1509 else
1510 p9_fid_destroy(fid);
1511 return err;
1512 }
1513 EXPORT_SYMBOL(p9_client_remove);
1514
1515 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1516 {
1517 int err = 0;
1518 struct p9_req_t *req;
1519 struct p9_client *clnt;
1520
1521 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1522 dfid->fid, name, flags);
1523
1524 clnt = dfid->clnt;
1525 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1526 if (IS_ERR(req)) {
1527 err = PTR_ERR(req);
1528 goto error;
1529 }
1530 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1531
1532 p9_free_req(clnt, req);
1533 error:
1534 return err;
1535 }
1536 EXPORT_SYMBOL(p9_client_unlinkat);
1537
1538 int
1539 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
1540 {
1541 struct p9_client *clnt = fid->clnt;
1542 struct p9_req_t *req;
1543 int total = 0;
1544 *err = 0;
1545
1546 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1547 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to));
1548
1549 while (iov_iter_count(to)) {
1550 int count = iov_iter_count(to);
1551 int rsize, non_zc = 0;
1552 char *dataptr;
1553
1554 rsize = fid->iounit;
1555 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1556 rsize = clnt->msize - P9_IOHDRSZ;
1557
1558 if (count < rsize)
1559 rsize = count;
1560
1561 /* Don't bother zerocopy for small IO (< 1024) */
1562 if (clnt->trans_mod->zc_request && rsize > 1024) {
1563 /*
1564 * response header len is 11
1565 * PDU Header(7) + IO Size (4)
1566 */
1567 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize,
1568 0, 11, "dqd", fid->fid,
1569 offset, rsize);
1570 } else {
1571 non_zc = 1;
1572 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1573 rsize);
1574 }
1575 if (IS_ERR(req)) {
1576 *err = PTR_ERR(req);
1577 break;
1578 }
1579
1580 *err = p9pdu_readf(req->rc, clnt->proto_version,
1581 "D", &count, &dataptr);
1582 if (*err) {
1583 trace_9p_protocol_dump(clnt, req->rc);
1584 p9_free_req(clnt, req);
1585 break;
1586 }
1587 if (rsize < count) {
1588 pr_err("bogus RREAD count (%d > %d)\n", count, rsize);
1589 count = rsize;
1590 }
1591
1592 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1593 if (!count) {
1594 p9_free_req(clnt, req);
1595 break;
1596 }
1597
1598 if (non_zc) {
1599 int n = copy_to_iter(dataptr, count, to);
1600 total += n;
1601 offset += n;
1602 if (n != count) {
1603 *err = -EFAULT;
1604 p9_free_req(clnt, req);
1605 break;
1606 }
1607 } else {
1608 iov_iter_advance(to, count);
1609 total += count;
1610 offset += count;
1611 }
1612 p9_free_req(clnt, req);
1613 }
1614 return total;
1615 }
1616 EXPORT_SYMBOL(p9_client_read);
1617
1618 int
1619 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
1620 {
1621 struct p9_client *clnt = fid->clnt;
1622 struct p9_req_t *req;
1623 int total = 0;
1624 *err = 0;
1625
1626 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n",
1627 fid->fid, (unsigned long long) offset,
1628 iov_iter_count(from));
1629
1630 while (iov_iter_count(from)) {
1631 int count = iov_iter_count(from);
1632 int rsize = fid->iounit;
1633 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1634 rsize = clnt->msize - P9_IOHDRSZ;
1635
1636 if (count < rsize)
1637 rsize = count;
1638
1639 /* Don't bother zerocopy for small IO (< 1024) */
1640 if (clnt->trans_mod->zc_request && rsize > 1024) {
1641 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0,
1642 rsize, P9_ZC_HDR_SZ, "dqd",
1643 fid->fid, offset, rsize);
1644 } else {
1645 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
1646 offset, rsize, from);
1647 }
1648 if (IS_ERR(req)) {
1649 *err = PTR_ERR(req);
1650 break;
1651 }
1652
1653 *err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1654 if (*err) {
1655 trace_9p_protocol_dump(clnt, req->rc);
1656 p9_free_req(clnt, req);
1657 break;
1658 }
1659 if (rsize < count) {
1660 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize);
1661 count = rsize;
1662 }
1663
1664 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1665
1666 p9_free_req(clnt, req);
1667 iov_iter_advance(from, count);
1668 total += count;
1669 offset += count;
1670 }
1671 return total;
1672 }
1673 EXPORT_SYMBOL(p9_client_write);
1674
1675 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1676 {
1677 int err;
1678 struct p9_client *clnt;
1679 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1680 struct p9_req_t *req;
1681 u16 ignored;
1682
1683 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1684
1685 if (!ret)
1686 return ERR_PTR(-ENOMEM);
1687
1688 err = 0;
1689 clnt = fid->clnt;
1690
1691 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1692 if (IS_ERR(req)) {
1693 err = PTR_ERR(req);
1694 goto error;
1695 }
1696
1697 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1698 if (err) {
1699 trace_9p_protocol_dump(clnt, req->rc);
1700 p9_free_req(clnt, req);
1701 goto error;
1702 }
1703
1704 p9_debug(P9_DEBUG_9P,
1705 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1706 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1707 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1708 "<<< uid=%d gid=%d n_muid=%d\n",
1709 ret->size, ret->type, ret->dev, ret->qid.type,
1710 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1711 ret->atime, ret->mtime, (unsigned long long)ret->length,
1712 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1713 from_kuid(&init_user_ns, ret->n_uid),
1714 from_kgid(&init_user_ns, ret->n_gid),
1715 from_kuid(&init_user_ns, ret->n_muid));
1716
1717 p9_free_req(clnt, req);
1718 return ret;
1719
1720 error:
1721 kfree(ret);
1722 return ERR_PTR(err);
1723 }
1724 EXPORT_SYMBOL(p9_client_stat);
1725
1726 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1727 u64 request_mask)
1728 {
1729 int err;
1730 struct p9_client *clnt;
1731 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1732 GFP_KERNEL);
1733 struct p9_req_t *req;
1734
1735 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1736 fid->fid, request_mask);
1737
1738 if (!ret)
1739 return ERR_PTR(-ENOMEM);
1740
1741 err = 0;
1742 clnt = fid->clnt;
1743
1744 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1745 if (IS_ERR(req)) {
1746 err = PTR_ERR(req);
1747 goto error;
1748 }
1749
1750 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1751 if (err) {
1752 trace_9p_protocol_dump(clnt, req->rc);
1753 p9_free_req(clnt, req);
1754 goto error;
1755 }
1756
1757 p9_debug(P9_DEBUG_9P,
1758 "<<< RGETATTR st_result_mask=%lld\n"
1759 "<<< qid=%x.%llx.%x\n"
1760 "<<< st_mode=%8.8x st_nlink=%llu\n"
1761 "<<< st_uid=%d st_gid=%d\n"
1762 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1763 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1764 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1765 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1766 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1767 "<<< st_gen=%lld st_data_version=%lld",
1768 ret->st_result_mask, ret->qid.type, ret->qid.path,
1769 ret->qid.version, ret->st_mode, ret->st_nlink,
1770 from_kuid(&init_user_ns, ret->st_uid),
1771 from_kgid(&init_user_ns, ret->st_gid),
1772 ret->st_rdev, ret->st_size, ret->st_blksize,
1773 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1774 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1775 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1776 ret->st_gen, ret->st_data_version);
1777
1778 p9_free_req(clnt, req);
1779 return ret;
1780
1781 error:
1782 kfree(ret);
1783 return ERR_PTR(err);
1784 }
1785 EXPORT_SYMBOL(p9_client_getattr_dotl);
1786
1787 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1788 {
1789 int ret;
1790
1791 /* NOTE: size shouldn't include its own length */
1792 /* size[2] type[2] dev[4] qid[13] */
1793 /* mode[4] atime[4] mtime[4] length[8]*/
1794 /* name[s] uid[s] gid[s] muid[s] */
1795 ret = 2+4+13+4+4+4+8+2+2+2+2;
1796
1797 if (wst->name)
1798 ret += strlen(wst->name);
1799 if (wst->uid)
1800 ret += strlen(wst->uid);
1801 if (wst->gid)
1802 ret += strlen(wst->gid);
1803 if (wst->muid)
1804 ret += strlen(wst->muid);
1805
1806 if ((proto_version == p9_proto_2000u) ||
1807 (proto_version == p9_proto_2000L)) {
1808 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1809 if (wst->extension)
1810 ret += strlen(wst->extension);
1811 }
1812
1813 return ret;
1814 }
1815
1816 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1817 {
1818 int err;
1819 struct p9_req_t *req;
1820 struct p9_client *clnt;
1821
1822 err = 0;
1823 clnt = fid->clnt;
1824 wst->size = p9_client_statsize(wst, clnt->proto_version);
1825 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1826 p9_debug(P9_DEBUG_9P,
1827 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1828 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1829 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1830 " uid=%d gid=%d n_muid=%d\n",
1831 wst->size, wst->type, wst->dev, wst->qid.type,
1832 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1833 wst->atime, wst->mtime, (unsigned long long)wst->length,
1834 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1835 from_kuid(&init_user_ns, wst->n_uid),
1836 from_kgid(&init_user_ns, wst->n_gid),
1837 from_kuid(&init_user_ns, wst->n_muid));
1838
1839 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1840 if (IS_ERR(req)) {
1841 err = PTR_ERR(req);
1842 goto error;
1843 }
1844
1845 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1846
1847 p9_free_req(clnt, req);
1848 error:
1849 return err;
1850 }
1851 EXPORT_SYMBOL(p9_client_wstat);
1852
1853 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1854 {
1855 int err;
1856 struct p9_req_t *req;
1857 struct p9_client *clnt;
1858
1859 err = 0;
1860 clnt = fid->clnt;
1861 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1862 p9_debug(P9_DEBUG_9P,
1863 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1864 " atime_sec=%lld atime_nsec=%lld\n"
1865 " mtime_sec=%lld mtime_nsec=%lld\n",
1866 p9attr->valid, p9attr->mode,
1867 from_kuid(&init_user_ns, p9attr->uid),
1868 from_kgid(&init_user_ns, p9attr->gid),
1869 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1870 p9attr->mtime_sec, p9attr->mtime_nsec);
1871
1872 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1873
1874 if (IS_ERR(req)) {
1875 err = PTR_ERR(req);
1876 goto error;
1877 }
1878 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1879 p9_free_req(clnt, req);
1880 error:
1881 return err;
1882 }
1883 EXPORT_SYMBOL(p9_client_setattr);
1884
1885 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1886 {
1887 int err;
1888 struct p9_req_t *req;
1889 struct p9_client *clnt;
1890
1891 err = 0;
1892 clnt = fid->clnt;
1893
1894 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1895
1896 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1897 if (IS_ERR(req)) {
1898 err = PTR_ERR(req);
1899 goto error;
1900 }
1901
1902 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1903 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1904 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1905 if (err) {
1906 trace_9p_protocol_dump(clnt, req->rc);
1907 p9_free_req(clnt, req);
1908 goto error;
1909 }
1910
1911 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1912 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1913 "fsid %llu namelen %ld\n",
1914 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1915 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1916 sb->fsid, (long int)sb->namelen);
1917
1918 p9_free_req(clnt, req);
1919 error:
1920 return err;
1921 }
1922 EXPORT_SYMBOL(p9_client_statfs);
1923
1924 int p9_client_rename(struct p9_fid *fid,
1925 struct p9_fid *newdirfid, const char *name)
1926 {
1927 int err;
1928 struct p9_req_t *req;
1929 struct p9_client *clnt;
1930
1931 err = 0;
1932 clnt = fid->clnt;
1933
1934 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1935 fid->fid, newdirfid->fid, name);
1936
1937 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1938 newdirfid->fid, name);
1939 if (IS_ERR(req)) {
1940 err = PTR_ERR(req);
1941 goto error;
1942 }
1943
1944 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1945
1946 p9_free_req(clnt, req);
1947 error:
1948 return err;
1949 }
1950 EXPORT_SYMBOL(p9_client_rename);
1951
1952 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1953 struct p9_fid *newdirfid, const char *new_name)
1954 {
1955 int err;
1956 struct p9_req_t *req;
1957 struct p9_client *clnt;
1958
1959 err = 0;
1960 clnt = olddirfid->clnt;
1961
1962 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1963 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1964 newdirfid->fid, new_name);
1965
1966 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1967 old_name, newdirfid->fid, new_name);
1968 if (IS_ERR(req)) {
1969 err = PTR_ERR(req);
1970 goto error;
1971 }
1972
1973 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1974 newdirfid->fid, new_name);
1975
1976 p9_free_req(clnt, req);
1977 error:
1978 return err;
1979 }
1980 EXPORT_SYMBOL(p9_client_renameat);
1981
1982 /*
1983 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1984 */
1985 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1986 const char *attr_name, u64 *attr_size)
1987 {
1988 int err;
1989 struct p9_req_t *req;
1990 struct p9_client *clnt;
1991 struct p9_fid *attr_fid;
1992
1993 err = 0;
1994 clnt = file_fid->clnt;
1995 attr_fid = p9_fid_create(clnt);
1996 if (IS_ERR(attr_fid)) {
1997 err = PTR_ERR(attr_fid);
1998 attr_fid = NULL;
1999 goto error;
2000 }
2001 p9_debug(P9_DEBUG_9P,
2002 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
2003 file_fid->fid, attr_fid->fid, attr_name);
2004
2005 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
2006 file_fid->fid, attr_fid->fid, attr_name);
2007 if (IS_ERR(req)) {
2008 err = PTR_ERR(req);
2009 goto error;
2010 }
2011 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
2012 if (err) {
2013 trace_9p_protocol_dump(clnt, req->rc);
2014 p9_free_req(clnt, req);
2015 goto clunk_fid;
2016 }
2017 p9_free_req(clnt, req);
2018 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2019 attr_fid->fid, *attr_size);
2020 return attr_fid;
2021 clunk_fid:
2022 p9_client_clunk(attr_fid);
2023 attr_fid = NULL;
2024 error:
2025 if (attr_fid && (attr_fid != file_fid))
2026 p9_fid_destroy(attr_fid);
2027
2028 return ERR_PTR(err);
2029 }
2030 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2031
2032 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2033 u64 attr_size, int flags)
2034 {
2035 int err;
2036 struct p9_req_t *req;
2037 struct p9_client *clnt;
2038
2039 p9_debug(P9_DEBUG_9P,
2040 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2041 fid->fid, name, (long long)attr_size, flags);
2042 err = 0;
2043 clnt = fid->clnt;
2044 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2045 fid->fid, name, attr_size, flags);
2046 if (IS_ERR(req)) {
2047 err = PTR_ERR(req);
2048 goto error;
2049 }
2050 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2051 p9_free_req(clnt, req);
2052 error:
2053 return err;
2054 }
2055 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2056
2057 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2058 {
2059 int err, rsize, non_zc = 0;
2060 struct p9_client *clnt;
2061 struct p9_req_t *req;
2062 char *dataptr;
2063 struct kvec kv = {.iov_base = data, .iov_len = count};
2064 struct iov_iter to;
2065
2066 iov_iter_kvec(&to, READ | ITER_KVEC, &kv, 1, count);
2067
2068 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2069 fid->fid, (unsigned long long) offset, count);
2070
2071 err = 0;
2072 clnt = fid->clnt;
2073
2074 rsize = fid->iounit;
2075 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2076 rsize = clnt->msize - P9_READDIRHDRSZ;
2077
2078 if (count < rsize)
2079 rsize = count;
2080
2081 /* Don't bother zerocopy for small IO (< 1024) */
2082 if (clnt->trans_mod->zc_request && rsize > 1024) {
2083 /*
2084 * response header len is 11
2085 * PDU Header(7) + IO Size (4)
2086 */
2087 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0,
2088 11, "dqd", fid->fid, offset, rsize);
2089 } else {
2090 non_zc = 1;
2091 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2092 offset, rsize);
2093 }
2094 if (IS_ERR(req)) {
2095 err = PTR_ERR(req);
2096 goto error;
2097 }
2098
2099 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2100 if (err) {
2101 trace_9p_protocol_dump(clnt, req->rc);
2102 goto free_and_error;
2103 }
2104
2105 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2106
2107 if (non_zc)
2108 memmove(data, dataptr, count);
2109
2110 p9_free_req(clnt, req);
2111 return count;
2112
2113 free_and_error:
2114 p9_free_req(clnt, req);
2115 error:
2116 return err;
2117 }
2118 EXPORT_SYMBOL(p9_client_readdir);
2119
2120 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
2121 dev_t rdev, kgid_t gid, struct p9_qid *qid)
2122 {
2123 int err;
2124 struct p9_client *clnt;
2125 struct p9_req_t *req;
2126
2127 err = 0;
2128 clnt = fid->clnt;
2129 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2130 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2131 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2132 MAJOR(rdev), MINOR(rdev), gid);
2133 if (IS_ERR(req))
2134 return PTR_ERR(req);
2135
2136 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2137 if (err) {
2138 trace_9p_protocol_dump(clnt, req->rc);
2139 goto error;
2140 }
2141 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2142 (unsigned long long)qid->path, qid->version);
2143
2144 error:
2145 p9_free_req(clnt, req);
2146 return err;
2147
2148 }
2149 EXPORT_SYMBOL(p9_client_mknod_dotl);
2150
2151 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
2152 kgid_t gid, struct p9_qid *qid)
2153 {
2154 int err;
2155 struct p9_client *clnt;
2156 struct p9_req_t *req;
2157
2158 err = 0;
2159 clnt = fid->clnt;
2160 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2161 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2162 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
2163 gid);
2164 if (IS_ERR(req))
2165 return PTR_ERR(req);
2166
2167 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2168 if (err) {
2169 trace_9p_protocol_dump(clnt, req->rc);
2170 goto error;
2171 }
2172 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2173 (unsigned long long)qid->path, qid->version);
2174
2175 error:
2176 p9_free_req(clnt, req);
2177 return err;
2178
2179 }
2180 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2181
2182 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2183 {
2184 int err;
2185 struct p9_client *clnt;
2186 struct p9_req_t *req;
2187
2188 err = 0;
2189 clnt = fid->clnt;
2190 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2191 "start %lld length %lld proc_id %d client_id %s\n",
2192 fid->fid, flock->type, flock->flags, flock->start,
2193 flock->length, flock->proc_id, flock->client_id);
2194
2195 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2196 flock->flags, flock->start, flock->length,
2197 flock->proc_id, flock->client_id);
2198
2199 if (IS_ERR(req))
2200 return PTR_ERR(req);
2201
2202 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2203 if (err) {
2204 trace_9p_protocol_dump(clnt, req->rc);
2205 goto error;
2206 }
2207 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2208 error:
2209 p9_free_req(clnt, req);
2210 return err;
2211
2212 }
2213 EXPORT_SYMBOL(p9_client_lock_dotl);
2214
2215 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2216 {
2217 int err;
2218 struct p9_client *clnt;
2219 struct p9_req_t *req;
2220
2221 err = 0;
2222 clnt = fid->clnt;
2223 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2224 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2225 glock->start, glock->length, glock->proc_id, glock->client_id);
2226
2227 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2228 glock->start, glock->length, glock->proc_id, glock->client_id);
2229
2230 if (IS_ERR(req))
2231 return PTR_ERR(req);
2232
2233 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2234 &glock->start, &glock->length, &glock->proc_id,
2235 &glock->client_id);
2236 if (err) {
2237 trace_9p_protocol_dump(clnt, req->rc);
2238 goto error;
2239 }
2240 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2241 "proc_id %d client_id %s\n", glock->type, glock->start,
2242 glock->length, glock->proc_id, glock->client_id);
2243 error:
2244 p9_free_req(clnt, req);
2245 return err;
2246 }
2247 EXPORT_SYMBOL(p9_client_getlock_dotl);
2248
2249 int p9_client_readlink(struct p9_fid *fid, char **target)
2250 {
2251 int err;
2252 struct p9_client *clnt;
2253 struct p9_req_t *req;
2254
2255 err = 0;
2256 clnt = fid->clnt;
2257 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2258
2259 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2260 if (IS_ERR(req))
2261 return PTR_ERR(req);
2262
2263 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2264 if (err) {
2265 trace_9p_protocol_dump(clnt, req->rc);
2266 goto error;
2267 }
2268 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2269 error:
2270 p9_free_req(clnt, req);
2271 return err;
2272 }
2273 EXPORT_SYMBOL(p9_client_readlink);
2274
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