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x86/mm: Add TLB purge to free pmd/pte page interfaces
[linux/fpc-iii.git] / net / 9p / client.c
blob1fd60190177e39367fa495207c9409811de52e2c
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_killable(*req->wq, req->status >= REQ_STATUS_RCVD);
753
754 /*
755 * Make sure our req is coherent with regard to updates in other
756 * threads - echoes to wmb() in the callback
757 */
758 smp_rmb();
759
760 if ((err == -ERESTARTSYS) && (c->status == Connected)
761 && (type == P9_TFLUSH)) {
762 sigpending = 1;
763 clear_thread_flag(TIF_SIGPENDING);
764 goto again;
765 }
766
767 if (req->status == REQ_STATUS_ERROR) {
768 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
769 err = req->t_err;
770 }
771 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
772 p9_debug(P9_DEBUG_MUX, "flushing\n");
773 sigpending = 1;
774 clear_thread_flag(TIF_SIGPENDING);
775
776 if (c->trans_mod->cancel(c, req))
777 p9_client_flush(c, req);
778
779 /* if we received the response anyway, don't signal error */
780 if (req->status == REQ_STATUS_RCVD)
781 err = 0;
782 }
783 if (sigpending) {
784 spin_lock_irqsave(&current->sighand->siglock, flags);
785 recalc_sigpending();
786 spin_unlock_irqrestore(&current->sighand->siglock, flags);
787 }
788 if (err < 0)
789 goto reterr;
790
791 err = p9_check_errors(c, req);
792 trace_9p_client_res(c, type, req->rc->tag, err);
793 if (!err)
794 return req;
795 reterr:
796 p9_free_req(c, req);
797 return ERR_PTR(safe_errno(err));
798 }
799
800 /**
801 * p9_client_zc_rpc - issue a request and wait for a response
802 * @c: client session
803 * @type: type of request
804 * @uidata: destination for zero copy read
805 * @uodata: source for zero copy write
806 * @inlen: read buffer size
807 * @olen: write buffer size
808 * @hdrlen: reader header size, This is the size of response protocol data
809 * @fmt: protocol format string (see protocol.c)
810 *
811 * Returns request structure (which client must free using p9_free_req)
812 */
813 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
814 struct iov_iter *uidata,
815 struct iov_iter *uodata,
816 int inlen, int olen, int in_hdrlen,
817 const char *fmt, ...)
818 {
819 va_list ap;
820 int sigpending, err;
821 unsigned long flags;
822 struct p9_req_t *req;
823
824 va_start(ap, fmt);
825 /*
826 * We allocate a inline protocol data of only 4k bytes.
827 * The actual content is passed in zero-copy fashion.
828 */
829 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
830 va_end(ap);
831 if (IS_ERR(req))
832 return req;
833
834 if (signal_pending(current)) {
835 sigpending = 1;
836 clear_thread_flag(TIF_SIGPENDING);
837 } else
838 sigpending = 0;
839
840 err = c->trans_mod->zc_request(c, req, uidata, uodata,
841 inlen, olen, in_hdrlen);
842 if (err < 0) {
843 if (err == -EIO)
844 c->status = Disconnected;
845 if (err != -ERESTARTSYS)
846 goto reterr;
847 }
848 if (req->status == REQ_STATUS_ERROR) {
849 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
850 err = req->t_err;
851 }
852 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
853 p9_debug(P9_DEBUG_MUX, "flushing\n");
854 sigpending = 1;
855 clear_thread_flag(TIF_SIGPENDING);
856
857 if (c->trans_mod->cancel(c, req))
858 p9_client_flush(c, req);
859
860 /* if we received the response anyway, don't signal error */
861 if (req->status == REQ_STATUS_RCVD)
862 err = 0;
863 }
864 if (sigpending) {
865 spin_lock_irqsave(&current->sighand->siglock, flags);
866 recalc_sigpending();
867 spin_unlock_irqrestore(&current->sighand->siglock, flags);
868 }
869 if (err < 0)
870 goto reterr;
871
872 err = p9_check_zc_errors(c, req, uidata, in_hdrlen);
873 trace_9p_client_res(c, type, req->rc->tag, err);
874 if (!err)
875 return req;
876 reterr:
877 p9_free_req(c, req);
878 return ERR_PTR(safe_errno(err));
879 }
880
881 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
882 {
883 int ret;
884 struct p9_fid *fid;
885 unsigned long flags;
886
887 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
888 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
889 if (!fid)
890 return ERR_PTR(-ENOMEM);
891
892 ret = p9_idpool_get(clnt->fidpool);
893 if (ret < 0) {
894 ret = -ENOSPC;
895 goto error;
896 }
897 fid->fid = ret;
898
899 memset(&fid->qid, 0, sizeof(struct p9_qid));
900 fid->mode = -1;
901 fid->uid = current_fsuid();
902 fid->clnt = clnt;
903 fid->rdir = NULL;
904 spin_lock_irqsave(&clnt->lock, flags);
905 list_add(&fid->flist, &clnt->fidlist);
906 spin_unlock_irqrestore(&clnt->lock, flags);
907
908 return fid;
909
910 error:
911 kfree(fid);
912 return ERR_PTR(ret);
913 }
914
915 static void p9_fid_destroy(struct p9_fid *fid)
916 {
917 struct p9_client *clnt;
918 unsigned long flags;
919
920 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
921 clnt = fid->clnt;
922 p9_idpool_put(fid->fid, clnt->fidpool);
923 spin_lock_irqsave(&clnt->lock, flags);
924 list_del(&fid->flist);
925 spin_unlock_irqrestore(&clnt->lock, flags);
926 kfree(fid->rdir);
927 kfree(fid);
928 }
929
930 static int p9_client_version(struct p9_client *c)
931 {
932 int err = 0;
933 struct p9_req_t *req;
934 char *version;
935 int msize;
936
937 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
938 c->msize, c->proto_version);
939
940 switch (c->proto_version) {
941 case p9_proto_2000L:
942 req = p9_client_rpc(c, P9_TVERSION, "ds",
943 c->msize, "9P2000.L");
944 break;
945 case p9_proto_2000u:
946 req = p9_client_rpc(c, P9_TVERSION, "ds",
947 c->msize, "9P2000.u");
948 break;
949 case p9_proto_legacy:
950 req = p9_client_rpc(c, P9_TVERSION, "ds",
951 c->msize, "9P2000");
952 break;
953 default:
954 return -EINVAL;
955 }
956
957 if (IS_ERR(req))
958 return PTR_ERR(req);
959
960 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
961 if (err) {
962 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
963 trace_9p_protocol_dump(c, req->rc);
964 goto error;
965 }
966
967 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
968 if (!strncmp(version, "9P2000.L", 8))
969 c->proto_version = p9_proto_2000L;
970 else if (!strncmp(version, "9P2000.u", 8))
971 c->proto_version = p9_proto_2000u;
972 else if (!strncmp(version, "9P2000", 6))
973 c->proto_version = p9_proto_legacy;
974 else {
975 err = -EREMOTEIO;
976 goto error;
977 }
978
979 if (msize < c->msize)
980 c->msize = msize;
981
982 error:
983 kfree(version);
984 p9_free_req(c, req);
985
986 return err;
987 }
988
989 struct p9_client *p9_client_create(const char *dev_name, char *options)
990 {
991 int err;
992 struct p9_client *clnt;
993 char *client_id;
994
995 err = 0;
996 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
997 if (!clnt)
998 return ERR_PTR(-ENOMEM);
999
1000 clnt->trans_mod = NULL;
1001 clnt->trans = NULL;
1002
1003 client_id = utsname()->nodename;
1004 memcpy(clnt->name, client_id, strlen(client_id) + 1);
1005
1006 spin_lock_init(&clnt->lock);
1007 INIT_LIST_HEAD(&clnt->fidlist);
1008
1009 err = p9_tag_init(clnt);
1010 if (err < 0)
1011 goto free_client;
1012
1013 err = parse_opts(options, clnt);
1014 if (err < 0)
1015 goto destroy_tagpool;
1016
1017 if (!clnt->trans_mod)
1018 clnt->trans_mod = v9fs_get_default_trans();
1019
1020 if (clnt->trans_mod == NULL) {
1021 err = -EPROTONOSUPPORT;
1022 p9_debug(P9_DEBUG_ERROR,
1023 "No transport defined or default transport\n");
1024 goto destroy_tagpool;
1025 }
1026
1027 clnt->fidpool = p9_idpool_create();
1028 if (IS_ERR(clnt->fidpool)) {
1029 err = PTR_ERR(clnt->fidpool);
1030 goto put_trans;
1031 }
1032
1033 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1034 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1035
1036 err = clnt->trans_mod->create(clnt, dev_name, options);
1037 if (err)
1038 goto destroy_fidpool;
1039
1040 if (clnt->msize > clnt->trans_mod->maxsize)
1041 clnt->msize = clnt->trans_mod->maxsize;
1042
1043 err = p9_client_version(clnt);
1044 if (err)
1045 goto close_trans;
1046
1047 return clnt;
1048
1049 close_trans:
1050 clnt->trans_mod->close(clnt);
1051 destroy_fidpool:
1052 p9_idpool_destroy(clnt->fidpool);
1053 put_trans:
1054 v9fs_put_trans(clnt->trans_mod);
1055 destroy_tagpool:
1056 p9_idpool_destroy(clnt->tagpool);
1057 free_client:
1058 kfree(clnt);
1059 return ERR_PTR(err);
1060 }
1061 EXPORT_SYMBOL(p9_client_create);
1062
1063 void p9_client_destroy(struct p9_client *clnt)
1064 {
1065 struct p9_fid *fid, *fidptr;
1066
1067 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1068
1069 if (clnt->trans_mod)
1070 clnt->trans_mod->close(clnt);
1071
1072 v9fs_put_trans(clnt->trans_mod);
1073
1074 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
1075 pr_info("Found fid %d not clunked\n", fid->fid);
1076 p9_fid_destroy(fid);
1077 }
1078
1079 if (clnt->fidpool)
1080 p9_idpool_destroy(clnt->fidpool);
1081
1082 p9_tag_cleanup(clnt);
1083
1084 kfree(clnt);
1085 }
1086 EXPORT_SYMBOL(p9_client_destroy);
1087
1088 void p9_client_disconnect(struct p9_client *clnt)
1089 {
1090 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1091 clnt->status = Disconnected;
1092 }
1093 EXPORT_SYMBOL(p9_client_disconnect);
1094
1095 void p9_client_begin_disconnect(struct p9_client *clnt)
1096 {
1097 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1098 clnt->status = BeginDisconnect;
1099 }
1100 EXPORT_SYMBOL(p9_client_begin_disconnect);
1101
1102 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1103 char *uname, kuid_t n_uname, char *aname)
1104 {
1105 int err = 0;
1106 struct p9_req_t *req;
1107 struct p9_fid *fid;
1108 struct p9_qid qid;
1109
1110
1111 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1112 afid ? afid->fid : -1, uname, aname);
1113 fid = p9_fid_create(clnt);
1114 if (IS_ERR(fid)) {
1115 err = PTR_ERR(fid);
1116 fid = NULL;
1117 goto error;
1118 }
1119 fid->uid = n_uname;
1120
1121 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1122 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1123 if (IS_ERR(req)) {
1124 err = PTR_ERR(req);
1125 goto error;
1126 }
1127
1128 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
1129 if (err) {
1130 trace_9p_protocol_dump(clnt, req->rc);
1131 p9_free_req(clnt, req);
1132 goto error;
1133 }
1134
1135 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1136 qid.type, (unsigned long long)qid.path, qid.version);
1137
1138 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1139
1140 p9_free_req(clnt, req);
1141 return fid;
1142
1143 error:
1144 if (fid)
1145 p9_fid_destroy(fid);
1146 return ERR_PTR(err);
1147 }
1148 EXPORT_SYMBOL(p9_client_attach);
1149
1150 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1151 char **wnames, int clone)
1152 {
1153 int err;
1154 struct p9_client *clnt;
1155 struct p9_fid *fid;
1156 struct p9_qid *wqids;
1157 struct p9_req_t *req;
1158 uint16_t nwqids, count;
1159
1160 err = 0;
1161 wqids = NULL;
1162 clnt = oldfid->clnt;
1163 if (clone) {
1164 fid = p9_fid_create(clnt);
1165 if (IS_ERR(fid)) {
1166 err = PTR_ERR(fid);
1167 fid = NULL;
1168 goto error;
1169 }
1170
1171 fid->uid = oldfid->uid;
1172 } else
1173 fid = oldfid;
1174
1175
1176 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1177 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1178
1179 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1180 nwname, wnames);
1181 if (IS_ERR(req)) {
1182 err = PTR_ERR(req);
1183 goto error;
1184 }
1185
1186 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1187 if (err) {
1188 trace_9p_protocol_dump(clnt, req->rc);
1189 p9_free_req(clnt, req);
1190 goto clunk_fid;
1191 }
1192 p9_free_req(clnt, req);
1193
1194 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1195
1196 if (nwqids != nwname) {
1197 err = -ENOENT;
1198 goto clunk_fid;
1199 }
1200
1201 for (count = 0; count < nwqids; count++)
1202 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1203 count, wqids[count].type,
1204 (unsigned long long)wqids[count].path,
1205 wqids[count].version);
1206
1207 if (nwname)
1208 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1209 else
1210 fid->qid = oldfid->qid;
1211
1212 kfree(wqids);
1213 return fid;
1214
1215 clunk_fid:
1216 kfree(wqids);
1217 p9_client_clunk(fid);
1218 fid = NULL;
1219
1220 error:
1221 if (fid && (fid != oldfid))
1222 p9_fid_destroy(fid);
1223
1224 return ERR_PTR(err);
1225 }
1226 EXPORT_SYMBOL(p9_client_walk);
1227
1228 int p9_client_open(struct p9_fid *fid, int mode)
1229 {
1230 int err;
1231 struct p9_client *clnt;
1232 struct p9_req_t *req;
1233 struct p9_qid qid;
1234 int iounit;
1235
1236 clnt = fid->clnt;
1237 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1238 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1239 err = 0;
1240
1241 if (fid->mode != -1)
1242 return -EINVAL;
1243
1244 if (p9_is_proto_dotl(clnt))
1245 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1246 else
1247 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1248 if (IS_ERR(req)) {
1249 err = PTR_ERR(req);
1250 goto error;
1251 }
1252
1253 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1254 if (err) {
1255 trace_9p_protocol_dump(clnt, req->rc);
1256 goto free_and_error;
1257 }
1258
1259 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1260 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1261 (unsigned long long)qid.path, qid.version, iounit);
1262
1263 fid->mode = mode;
1264 fid->iounit = iounit;
1265
1266 free_and_error:
1267 p9_free_req(clnt, req);
1268 error:
1269 return err;
1270 }
1271 EXPORT_SYMBOL(p9_client_open);
1272
1273 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1274 kgid_t gid, struct p9_qid *qid)
1275 {
1276 int err = 0;
1277 struct p9_client *clnt;
1278 struct p9_req_t *req;
1279 int iounit;
1280
1281 p9_debug(P9_DEBUG_9P,
1282 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1283 ofid->fid, name, flags, mode,
1284 from_kgid(&init_user_ns, gid));
1285 clnt = ofid->clnt;
1286
1287 if (ofid->mode != -1)
1288 return -EINVAL;
1289
1290 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1291 mode, gid);
1292 if (IS_ERR(req)) {
1293 err = PTR_ERR(req);
1294 goto error;
1295 }
1296
1297 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1298 if (err) {
1299 trace_9p_protocol_dump(clnt, req->rc);
1300 goto free_and_error;
1301 }
1302
1303 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1304 qid->type,
1305 (unsigned long long)qid->path,
1306 qid->version, iounit);
1307
1308 ofid->mode = mode;
1309 ofid->iounit = iounit;
1310
1311 free_and_error:
1312 p9_free_req(clnt, req);
1313 error:
1314 return err;
1315 }
1316 EXPORT_SYMBOL(p9_client_create_dotl);
1317
1318 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1319 char *extension)
1320 {
1321 int err;
1322 struct p9_client *clnt;
1323 struct p9_req_t *req;
1324 struct p9_qid qid;
1325 int iounit;
1326
1327 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1328 fid->fid, name, perm, mode);
1329 err = 0;
1330 clnt = fid->clnt;
1331
1332 if (fid->mode != -1)
1333 return -EINVAL;
1334
1335 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1336 mode, extension);
1337 if (IS_ERR(req)) {
1338 err = PTR_ERR(req);
1339 goto error;
1340 }
1341
1342 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1343 if (err) {
1344 trace_9p_protocol_dump(clnt, req->rc);
1345 goto free_and_error;
1346 }
1347
1348 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1349 qid.type,
1350 (unsigned long long)qid.path,
1351 qid.version, iounit);
1352
1353 fid->mode = mode;
1354 fid->iounit = iounit;
1355
1356 free_and_error:
1357 p9_free_req(clnt, req);
1358 error:
1359 return err;
1360 }
1361 EXPORT_SYMBOL(p9_client_fcreate);
1362
1363 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, kgid_t gid,
1364 struct p9_qid *qid)
1365 {
1366 int err = 0;
1367 struct p9_client *clnt;
1368 struct p9_req_t *req;
1369
1370 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1371 dfid->fid, name, symtgt);
1372 clnt = dfid->clnt;
1373
1374 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1375 gid);
1376 if (IS_ERR(req)) {
1377 err = PTR_ERR(req);
1378 goto error;
1379 }
1380
1381 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1382 if (err) {
1383 trace_9p_protocol_dump(clnt, req->rc);
1384 goto free_and_error;
1385 }
1386
1387 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1388 qid->type, (unsigned long long)qid->path, qid->version);
1389
1390 free_and_error:
1391 p9_free_req(clnt, req);
1392 error:
1393 return err;
1394 }
1395 EXPORT_SYMBOL(p9_client_symlink);
1396
1397 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1398 {
1399 struct p9_client *clnt;
1400 struct p9_req_t *req;
1401
1402 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1403 dfid->fid, oldfid->fid, newname);
1404 clnt = dfid->clnt;
1405 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1406 newname);
1407 if (IS_ERR(req))
1408 return PTR_ERR(req);
1409
1410 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1411 p9_free_req(clnt, req);
1412 return 0;
1413 }
1414 EXPORT_SYMBOL(p9_client_link);
1415
1416 int p9_client_fsync(struct p9_fid *fid, int datasync)
1417 {
1418 int err;
1419 struct p9_client *clnt;
1420 struct p9_req_t *req;
1421
1422 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1423 fid->fid, datasync);
1424 err = 0;
1425 clnt = fid->clnt;
1426
1427 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1428 if (IS_ERR(req)) {
1429 err = PTR_ERR(req);
1430 goto error;
1431 }
1432
1433 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1434
1435 p9_free_req(clnt, req);
1436
1437 error:
1438 return err;
1439 }
1440 EXPORT_SYMBOL(p9_client_fsync);
1441
1442 int p9_client_clunk(struct p9_fid *fid)
1443 {
1444 int err;
1445 struct p9_client *clnt;
1446 struct p9_req_t *req;
1447 int retries = 0;
1448
1449 if (!fid) {
1450 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1451 __func__, task_pid_nr(current));
1452 dump_stack();
1453 return 0;
1454 }
1455
1456 again:
1457 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1458 retries);
1459 err = 0;
1460 clnt = fid->clnt;
1461
1462 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1463 if (IS_ERR(req)) {
1464 err = PTR_ERR(req);
1465 goto error;
1466 }
1467
1468 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1469
1470 p9_free_req(clnt, req);
1471 error:
1472 /*
1473 * Fid is not valid even after a failed clunk
1474 * If interrupted, retry once then give up and
1475 * leak fid until umount.
1476 */
1477 if (err == -ERESTARTSYS) {
1478 if (retries++ == 0)
1479 goto again;
1480 } else
1481 p9_fid_destroy(fid);
1482 return err;
1483 }
1484 EXPORT_SYMBOL(p9_client_clunk);
1485
1486 int p9_client_remove(struct p9_fid *fid)
1487 {
1488 int err;
1489 struct p9_client *clnt;
1490 struct p9_req_t *req;
1491
1492 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1493 err = 0;
1494 clnt = fid->clnt;
1495
1496 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1497 if (IS_ERR(req)) {
1498 err = PTR_ERR(req);
1499 goto error;
1500 }
1501
1502 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1503
1504 p9_free_req(clnt, req);
1505 error:
1506 if (err == -ERESTARTSYS)
1507 p9_client_clunk(fid);
1508 else
1509 p9_fid_destroy(fid);
1510 return err;
1511 }
1512 EXPORT_SYMBOL(p9_client_remove);
1513
1514 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1515 {
1516 int err = 0;
1517 struct p9_req_t *req;
1518 struct p9_client *clnt;
1519
1520 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1521 dfid->fid, name, flags);
1522
1523 clnt = dfid->clnt;
1524 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1525 if (IS_ERR(req)) {
1526 err = PTR_ERR(req);
1527 goto error;
1528 }
1529 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1530
1531 p9_free_req(clnt, req);
1532 error:
1533 return err;
1534 }
1535 EXPORT_SYMBOL(p9_client_unlinkat);
1536
1537 int
1538 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
1539 {
1540 struct p9_client *clnt = fid->clnt;
1541 struct p9_req_t *req;
1542 int total = 0;
1543 *err = 0;
1544
1545 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1546 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to));
1547
1548 while (iov_iter_count(to)) {
1549 int count = iov_iter_count(to);
1550 int rsize, non_zc = 0;
1551 char *dataptr;
1552
1553 rsize = fid->iounit;
1554 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1555 rsize = clnt->msize - P9_IOHDRSZ;
1556
1557 if (count < rsize)
1558 rsize = count;
1559
1560 /* Don't bother zerocopy for small IO (< 1024) */
1561 if (clnt->trans_mod->zc_request && rsize > 1024) {
1562 /*
1563 * response header len is 11
1564 * PDU Header(7) + IO Size (4)
1565 */
1566 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize,
1567 0, 11, "dqd", fid->fid,
1568 offset, rsize);
1569 } else {
1570 non_zc = 1;
1571 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1572 rsize);
1573 }
1574 if (IS_ERR(req)) {
1575 *err = PTR_ERR(req);
1576 break;
1577 }
1578
1579 *err = p9pdu_readf(req->rc, clnt->proto_version,
1580 "D", &count, &dataptr);
1581 if (*err) {
1582 trace_9p_protocol_dump(clnt, req->rc);
1583 p9_free_req(clnt, req);
1584 break;
1585 }
1586 if (rsize < count) {
1587 pr_err("bogus RREAD count (%d > %d)\n", count, rsize);
1588 count = rsize;
1589 }
1590
1591 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1592 if (!count) {
1593 p9_free_req(clnt, req);
1594 break;
1595 }
1596
1597 if (non_zc) {
1598 int n = copy_to_iter(dataptr, count, to);
1599 total += n;
1600 offset += n;
1601 if (n != count) {
1602 *err = -EFAULT;
1603 p9_free_req(clnt, req);
1604 break;
1605 }
1606 } else {
1607 iov_iter_advance(to, count);
1608 total += count;
1609 offset += count;
1610 }
1611 p9_free_req(clnt, req);
1612 }
1613 return total;
1614 }
1615 EXPORT_SYMBOL(p9_client_read);
1616
1617 int
1618 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
1619 {
1620 struct p9_client *clnt = fid->clnt;
1621 struct p9_req_t *req;
1622 int total = 0;
1623 *err = 0;
1624
1625 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n",
1626 fid->fid, (unsigned long long) offset,
1627 iov_iter_count(from));
1628
1629 while (iov_iter_count(from)) {
1630 int count = iov_iter_count(from);
1631 int rsize = fid->iounit;
1632 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1633 rsize = clnt->msize - P9_IOHDRSZ;
1634
1635 if (count < rsize)
1636 rsize = count;
1637
1638 /* Don't bother zerocopy for small IO (< 1024) */
1639 if (clnt->trans_mod->zc_request && rsize > 1024) {
1640 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0,
1641 rsize, P9_ZC_HDR_SZ, "dqd",
1642 fid->fid, offset, rsize);
1643 } else {
1644 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
1645 offset, rsize, from);
1646 }
1647 if (IS_ERR(req)) {
1648 *err = PTR_ERR(req);
1649 break;
1650 }
1651
1652 *err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1653 if (*err) {
1654 trace_9p_protocol_dump(clnt, req->rc);
1655 p9_free_req(clnt, req);
1656 break;
1657 }
1658 if (rsize < count) {
1659 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize);
1660 count = rsize;
1661 }
1662
1663 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1664
1665 p9_free_req(clnt, req);
1666 iov_iter_advance(from, count);
1667 total += count;
1668 offset += count;
1669 }
1670 return total;
1671 }
1672 EXPORT_SYMBOL(p9_client_write);
1673
1674 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1675 {
1676 int err;
1677 struct p9_client *clnt;
1678 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1679 struct p9_req_t *req;
1680 u16 ignored;
1681
1682 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1683
1684 if (!ret)
1685 return ERR_PTR(-ENOMEM);
1686
1687 err = 0;
1688 clnt = fid->clnt;
1689
1690 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1691 if (IS_ERR(req)) {
1692 err = PTR_ERR(req);
1693 goto error;
1694 }
1695
1696 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1697 if (err) {
1698 trace_9p_protocol_dump(clnt, req->rc);
1699 p9_free_req(clnt, req);
1700 goto error;
1701 }
1702
1703 p9_debug(P9_DEBUG_9P,
1704 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1705 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1706 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1707 "<<< uid=%d gid=%d n_muid=%d\n",
1708 ret->size, ret->type, ret->dev, ret->qid.type,
1709 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1710 ret->atime, ret->mtime, (unsigned long long)ret->length,
1711 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1712 from_kuid(&init_user_ns, ret->n_uid),
1713 from_kgid(&init_user_ns, ret->n_gid),
1714 from_kuid(&init_user_ns, ret->n_muid));
1715
1716 p9_free_req(clnt, req);
1717 return ret;
1718
1719 error:
1720 kfree(ret);
1721 return ERR_PTR(err);
1722 }
1723 EXPORT_SYMBOL(p9_client_stat);
1724
1725 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1726 u64 request_mask)
1727 {
1728 int err;
1729 struct p9_client *clnt;
1730 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1731 GFP_KERNEL);
1732 struct p9_req_t *req;
1733
1734 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1735 fid->fid, request_mask);
1736
1737 if (!ret)
1738 return ERR_PTR(-ENOMEM);
1739
1740 err = 0;
1741 clnt = fid->clnt;
1742
1743 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1744 if (IS_ERR(req)) {
1745 err = PTR_ERR(req);
1746 goto error;
1747 }
1748
1749 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1750 if (err) {
1751 trace_9p_protocol_dump(clnt, req->rc);
1752 p9_free_req(clnt, req);
1753 goto error;
1754 }
1755
1756 p9_debug(P9_DEBUG_9P,
1757 "<<< RGETATTR st_result_mask=%lld\n"
1758 "<<< qid=%x.%llx.%x\n"
1759 "<<< st_mode=%8.8x st_nlink=%llu\n"
1760 "<<< st_uid=%d st_gid=%d\n"
1761 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1762 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1763 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1764 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1765 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1766 "<<< st_gen=%lld st_data_version=%lld",
1767 ret->st_result_mask, ret->qid.type, ret->qid.path,
1768 ret->qid.version, ret->st_mode, ret->st_nlink,
1769 from_kuid(&init_user_ns, ret->st_uid),
1770 from_kgid(&init_user_ns, ret->st_gid),
1771 ret->st_rdev, ret->st_size, ret->st_blksize,
1772 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1773 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1774 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1775 ret->st_gen, ret->st_data_version);
1776
1777 p9_free_req(clnt, req);
1778 return ret;
1779
1780 error:
1781 kfree(ret);
1782 return ERR_PTR(err);
1783 }
1784 EXPORT_SYMBOL(p9_client_getattr_dotl);
1785
1786 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1787 {
1788 int ret;
1789
1790 /* NOTE: size shouldn't include its own length */
1791 /* size[2] type[2] dev[4] qid[13] */
1792 /* mode[4] atime[4] mtime[4] length[8]*/
1793 /* name[s] uid[s] gid[s] muid[s] */
1794 ret = 2+4+13+4+4+4+8+2+2+2+2;
1795
1796 if (wst->name)
1797 ret += strlen(wst->name);
1798 if (wst->uid)
1799 ret += strlen(wst->uid);
1800 if (wst->gid)
1801 ret += strlen(wst->gid);
1802 if (wst->muid)
1803 ret += strlen(wst->muid);
1804
1805 if ((proto_version == p9_proto_2000u) ||
1806 (proto_version == p9_proto_2000L)) {
1807 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1808 if (wst->extension)
1809 ret += strlen(wst->extension);
1810 }
1811
1812 return ret;
1813 }
1814
1815 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1816 {
1817 int err;
1818 struct p9_req_t *req;
1819 struct p9_client *clnt;
1820
1821 err = 0;
1822 clnt = fid->clnt;
1823 wst->size = p9_client_statsize(wst, clnt->proto_version);
1824 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1825 p9_debug(P9_DEBUG_9P,
1826 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1827 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1828 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1829 " uid=%d gid=%d n_muid=%d\n",
1830 wst->size, wst->type, wst->dev, wst->qid.type,
1831 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1832 wst->atime, wst->mtime, (unsigned long long)wst->length,
1833 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1834 from_kuid(&init_user_ns, wst->n_uid),
1835 from_kgid(&init_user_ns, wst->n_gid),
1836 from_kuid(&init_user_ns, wst->n_muid));
1837
1838 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1839 if (IS_ERR(req)) {
1840 err = PTR_ERR(req);
1841 goto error;
1842 }
1843
1844 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1845
1846 p9_free_req(clnt, req);
1847 error:
1848 return err;
1849 }
1850 EXPORT_SYMBOL(p9_client_wstat);
1851
1852 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1853 {
1854 int err;
1855 struct p9_req_t *req;
1856 struct p9_client *clnt;
1857
1858 err = 0;
1859 clnt = fid->clnt;
1860 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1861 p9_debug(P9_DEBUG_9P,
1862 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1863 " atime_sec=%lld atime_nsec=%lld\n"
1864 " mtime_sec=%lld mtime_nsec=%lld\n",
1865 p9attr->valid, p9attr->mode,
1866 from_kuid(&init_user_ns, p9attr->uid),
1867 from_kgid(&init_user_ns, p9attr->gid),
1868 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1869 p9attr->mtime_sec, p9attr->mtime_nsec);
1870
1871 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1872
1873 if (IS_ERR(req)) {
1874 err = PTR_ERR(req);
1875 goto error;
1876 }
1877 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1878 p9_free_req(clnt, req);
1879 error:
1880 return err;
1881 }
1882 EXPORT_SYMBOL(p9_client_setattr);
1883
1884 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1885 {
1886 int err;
1887 struct p9_req_t *req;
1888 struct p9_client *clnt;
1889
1890 err = 0;
1891 clnt = fid->clnt;
1892
1893 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1894
1895 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1896 if (IS_ERR(req)) {
1897 err = PTR_ERR(req);
1898 goto error;
1899 }
1900
1901 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1902 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1903 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1904 if (err) {
1905 trace_9p_protocol_dump(clnt, req->rc);
1906 p9_free_req(clnt, req);
1907 goto error;
1908 }
1909
1910 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1911 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1912 "fsid %llu namelen %ld\n",
1913 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1914 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1915 sb->fsid, (long int)sb->namelen);
1916
1917 p9_free_req(clnt, req);
1918 error:
1919 return err;
1920 }
1921 EXPORT_SYMBOL(p9_client_statfs);
1922
1923 int p9_client_rename(struct p9_fid *fid,
1924 struct p9_fid *newdirfid, const char *name)
1925 {
1926 int err;
1927 struct p9_req_t *req;
1928 struct p9_client *clnt;
1929
1930 err = 0;
1931 clnt = fid->clnt;
1932
1933 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1934 fid->fid, newdirfid->fid, name);
1935
1936 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1937 newdirfid->fid, name);
1938 if (IS_ERR(req)) {
1939 err = PTR_ERR(req);
1940 goto error;
1941 }
1942
1943 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1944
1945 p9_free_req(clnt, req);
1946 error:
1947 return err;
1948 }
1949 EXPORT_SYMBOL(p9_client_rename);
1950
1951 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1952 struct p9_fid *newdirfid, const char *new_name)
1953 {
1954 int err;
1955 struct p9_req_t *req;
1956 struct p9_client *clnt;
1957
1958 err = 0;
1959 clnt = olddirfid->clnt;
1960
1961 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1962 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1963 newdirfid->fid, new_name);
1964
1965 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1966 old_name, newdirfid->fid, new_name);
1967 if (IS_ERR(req)) {
1968 err = PTR_ERR(req);
1969 goto error;
1970 }
1971
1972 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1973 newdirfid->fid, new_name);
1974
1975 p9_free_req(clnt, req);
1976 error:
1977 return err;
1978 }
1979 EXPORT_SYMBOL(p9_client_renameat);
1980
1981 /*
1982 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1983 */
1984 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1985 const char *attr_name, u64 *attr_size)
1986 {
1987 int err;
1988 struct p9_req_t *req;
1989 struct p9_client *clnt;
1990 struct p9_fid *attr_fid;
1991
1992 err = 0;
1993 clnt = file_fid->clnt;
1994 attr_fid = p9_fid_create(clnt);
1995 if (IS_ERR(attr_fid)) {
1996 err = PTR_ERR(attr_fid);
1997 attr_fid = NULL;
1998 goto error;
1999 }
2000 p9_debug(P9_DEBUG_9P,
2001 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
2002 file_fid->fid, attr_fid->fid, attr_name);
2003
2004 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
2005 file_fid->fid, attr_fid->fid, attr_name);
2006 if (IS_ERR(req)) {
2007 err = PTR_ERR(req);
2008 goto error;
2009 }
2010 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
2011 if (err) {
2012 trace_9p_protocol_dump(clnt, req->rc);
2013 p9_free_req(clnt, req);
2014 goto clunk_fid;
2015 }
2016 p9_free_req(clnt, req);
2017 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2018 attr_fid->fid, *attr_size);
2019 return attr_fid;
2020 clunk_fid:
2021 p9_client_clunk(attr_fid);
2022 attr_fid = NULL;
2023 error:
2024 if (attr_fid && (attr_fid != file_fid))
2025 p9_fid_destroy(attr_fid);
2026
2027 return ERR_PTR(err);
2028 }
2029 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2030
2031 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2032 u64 attr_size, int flags)
2033 {
2034 int err;
2035 struct p9_req_t *req;
2036 struct p9_client *clnt;
2037
2038 p9_debug(P9_DEBUG_9P,
2039 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2040 fid->fid, name, (long long)attr_size, flags);
2041 err = 0;
2042 clnt = fid->clnt;
2043 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2044 fid->fid, name, attr_size, flags);
2045 if (IS_ERR(req)) {
2046 err = PTR_ERR(req);
2047 goto error;
2048 }
2049 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2050 p9_free_req(clnt, req);
2051 error:
2052 return err;
2053 }
2054 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2055
2056 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2057 {
2058 int err, rsize, non_zc = 0;
2059 struct p9_client *clnt;
2060 struct p9_req_t *req;
2061 char *dataptr;
2062 struct kvec kv = {.iov_base = data, .iov_len = count};
2063 struct iov_iter to;
2064
2065 iov_iter_kvec(&to, READ | ITER_KVEC, &kv, 1, count);
2066
2067 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2068 fid->fid, (unsigned long long) offset, count);
2069
2070 err = 0;
2071 clnt = fid->clnt;
2072
2073 rsize = fid->iounit;
2074 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2075 rsize = clnt->msize - P9_READDIRHDRSZ;
2076
2077 if (count < rsize)
2078 rsize = count;
2079
2080 /* Don't bother zerocopy for small IO (< 1024) */
2081 if (clnt->trans_mod->zc_request && rsize > 1024) {
2082 /*
2083 * response header len is 11
2084 * PDU Header(7) + IO Size (4)
2085 */
2086 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0,
2087 11, "dqd", fid->fid, offset, rsize);
2088 } else {
2089 non_zc = 1;
2090 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2091 offset, rsize);
2092 }
2093 if (IS_ERR(req)) {
2094 err = PTR_ERR(req);
2095 goto error;
2096 }
2097
2098 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2099 if (err) {
2100 trace_9p_protocol_dump(clnt, req->rc);
2101 goto free_and_error;
2102 }
2103 if (rsize < count) {
2104 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize);
2105 count = rsize;
2106 }
2107
2108 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2109
2110 if (non_zc)
2111 memmove(data, dataptr, count);
2112
2113 p9_free_req(clnt, req);
2114 return count;
2115
2116 free_and_error:
2117 p9_free_req(clnt, req);
2118 error:
2119 return err;
2120 }
2121 EXPORT_SYMBOL(p9_client_readdir);
2122
2123 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
2124 dev_t rdev, kgid_t gid, struct p9_qid *qid)
2125 {
2126 int err;
2127 struct p9_client *clnt;
2128 struct p9_req_t *req;
2129
2130 err = 0;
2131 clnt = fid->clnt;
2132 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2133 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2134 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2135 MAJOR(rdev), MINOR(rdev), gid);
2136 if (IS_ERR(req))
2137 return PTR_ERR(req);
2138
2139 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2140 if (err) {
2141 trace_9p_protocol_dump(clnt, req->rc);
2142 goto error;
2143 }
2144 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2145 (unsigned long long)qid->path, qid->version);
2146
2147 error:
2148 p9_free_req(clnt, req);
2149 return err;
2150
2151 }
2152 EXPORT_SYMBOL(p9_client_mknod_dotl);
2153
2154 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
2155 kgid_t gid, struct p9_qid *qid)
2156 {
2157 int err;
2158 struct p9_client *clnt;
2159 struct p9_req_t *req;
2160
2161 err = 0;
2162 clnt = fid->clnt;
2163 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2164 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2165 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
2166 gid);
2167 if (IS_ERR(req))
2168 return PTR_ERR(req);
2169
2170 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2171 if (err) {
2172 trace_9p_protocol_dump(clnt, req->rc);
2173 goto error;
2174 }
2175 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2176 (unsigned long long)qid->path, qid->version);
2177
2178 error:
2179 p9_free_req(clnt, req);
2180 return err;
2181
2182 }
2183 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2184
2185 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2186 {
2187 int err;
2188 struct p9_client *clnt;
2189 struct p9_req_t *req;
2190
2191 err = 0;
2192 clnt = fid->clnt;
2193 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2194 "start %lld length %lld proc_id %d client_id %s\n",
2195 fid->fid, flock->type, flock->flags, flock->start,
2196 flock->length, flock->proc_id, flock->client_id);
2197
2198 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2199 flock->flags, flock->start, flock->length,
2200 flock->proc_id, flock->client_id);
2201
2202 if (IS_ERR(req))
2203 return PTR_ERR(req);
2204
2205 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2206 if (err) {
2207 trace_9p_protocol_dump(clnt, req->rc);
2208 goto error;
2209 }
2210 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2211 error:
2212 p9_free_req(clnt, req);
2213 return err;
2214
2215 }
2216 EXPORT_SYMBOL(p9_client_lock_dotl);
2217
2218 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2219 {
2220 int err;
2221 struct p9_client *clnt;
2222 struct p9_req_t *req;
2223
2224 err = 0;
2225 clnt = fid->clnt;
2226 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2227 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2228 glock->start, glock->length, glock->proc_id, glock->client_id);
2229
2230 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2231 glock->start, glock->length, glock->proc_id, glock->client_id);
2232
2233 if (IS_ERR(req))
2234 return PTR_ERR(req);
2235
2236 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2237 &glock->start, &glock->length, &glock->proc_id,
2238 &glock->client_id);
2239 if (err) {
2240 trace_9p_protocol_dump(clnt, req->rc);
2241 goto error;
2242 }
2243 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2244 "proc_id %d client_id %s\n", glock->type, glock->start,
2245 glock->length, glock->proc_id, glock->client_id);
2246 error:
2247 p9_free_req(clnt, req);
2248 return err;
2249 }
2250 EXPORT_SYMBOL(p9_client_getlock_dotl);
2251
2252 int p9_client_readlink(struct p9_fid *fid, char **target)
2253 {
2254 int err;
2255 struct p9_client *clnt;
2256 struct p9_req_t *req;
2257
2258 err = 0;
2259 clnt = fid->clnt;
2260 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2261
2262 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2263 if (IS_ERR(req))
2264 return PTR_ERR(req);
2265
2266 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2267 if (err) {
2268 trace_9p_protocol_dump(clnt, req->rc);
2269 goto error;
2270 }
2271 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2272 error:
2273 p9_free_req(clnt, req);
2274 return err;
2275 }
2276 EXPORT_SYMBOL(p9_client_readlink);
Linux with added FPC-III support