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Linux 4.19-rc7
[linux-2.6/btrfs-unstable.git] / net / 9p / client.c
blobdeae53a7dffc868d66efbcc01bba141b97d97128
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/signal.h>
36 #include <linux/uaccess.h>
37 #include <linux/uio.h>
38 #include <net/9p/9p.h>
39 #include <linux/parser.h>
40 #include <linux/seq_file.h>
41 #include <net/9p/client.h>
42 #include <net/9p/transport.h>
43 #include "protocol.h"
44
45 #define CREATE_TRACE_POINTS
46 #include <trace/events/9p.h>
47
48 /*
49 * Client Option Parsing (code inspired by NFS code)
50 * - a little lazy - parse all client options
51 */
52
53 enum {
54 Opt_msize,
55 Opt_trans,
56 Opt_legacy,
57 Opt_version,
58 Opt_err,
59 };
60
61 static const match_table_t tokens = {
62 {Opt_msize, "msize=%u"},
63 {Opt_legacy, "noextend"},
64 {Opt_trans, "trans=%s"},
65 {Opt_version, "version=%s"},
66 {Opt_err, NULL},
67 };
68
69 inline int p9_is_proto_dotl(struct p9_client *clnt)
70 {
71 return clnt->proto_version == p9_proto_2000L;
72 }
73 EXPORT_SYMBOL(p9_is_proto_dotl);
74
75 inline int p9_is_proto_dotu(struct p9_client *clnt)
76 {
77 return clnt->proto_version == p9_proto_2000u;
78 }
79 EXPORT_SYMBOL(p9_is_proto_dotu);
80
81 int p9_show_client_options(struct seq_file *m, struct p9_client *clnt)
82 {
83 if (clnt->msize != 8192)
84 seq_printf(m, ",msize=%u", clnt->msize);
85 seq_printf(m, ",trans=%s", clnt->trans_mod->name);
86
87 switch (clnt->proto_version) {
88 case p9_proto_legacy:
89 seq_puts(m, ",noextend");
90 break;
91 case p9_proto_2000u:
92 seq_puts(m, ",version=9p2000.u");
93 break;
94 case p9_proto_2000L:
95 /* Default */
96 break;
97 }
98
99 if (clnt->trans_mod->show_options)
100 return clnt->trans_mod->show_options(m, clnt);
101 return 0;
102 }
103 EXPORT_SYMBOL(p9_show_client_options);
104
105 /*
106 * Some error codes are taken directly from the server replies,
107 * make sure they are valid.
108 */
109 static int safe_errno(int err)
110 {
111 if ((err > 0) || (err < -MAX_ERRNO)) {
112 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err);
113 return -EPROTO;
114 }
115 return err;
116 }
117
118
119 /* Interpret mount option for protocol version */
120 static int get_protocol_version(char *s)
121 {
122 int version = -EINVAL;
123
124 if (!strcmp(s, "9p2000")) {
125 version = p9_proto_legacy;
126 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n");
127 } else if (!strcmp(s, "9p2000.u")) {
128 version = p9_proto_2000u;
129 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
130 } else if (!strcmp(s, "9p2000.L")) {
131 version = p9_proto_2000L;
132 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
133 } else
134 pr_info("Unknown protocol version %s\n", s);
135
136 return version;
137 }
138
139 /**
140 * parse_options - parse mount options into client structure
141 * @opts: options string passed from mount
142 * @clnt: existing v9fs client information
143 *
144 * Return 0 upon success, -ERRNO upon failure
145 */
146
147 static int parse_opts(char *opts, struct p9_client *clnt)
148 {
149 char *options, *tmp_options;
150 char *p;
151 substring_t args[MAX_OPT_ARGS];
152 int option;
153 char *s;
154 int ret = 0;
155
156 clnt->proto_version = p9_proto_2000L;
157 clnt->msize = 8192;
158
159 if (!opts)
160 return 0;
161
162 tmp_options = kstrdup(opts, GFP_KERNEL);
163 if (!tmp_options) {
164 p9_debug(P9_DEBUG_ERROR,
165 "failed to allocate copy of option string\n");
166 return -ENOMEM;
167 }
168 options = tmp_options;
169
170 while ((p = strsep(&options, ",")) != NULL) {
171 int token, r;
172 if (!*p)
173 continue;
174 token = match_token(p, tokens, args);
175 switch (token) {
176 case Opt_msize:
177 r = match_int(&args[0], &option);
178 if (r < 0) {
179 p9_debug(P9_DEBUG_ERROR,
180 "integer field, but no integer?\n");
181 ret = r;
182 continue;
183 }
184 clnt->msize = option;
185 break;
186 case Opt_trans:
187 s = match_strdup(&args[0]);
188 if (!s) {
189 ret = -ENOMEM;
190 p9_debug(P9_DEBUG_ERROR,
191 "problem allocating copy of trans arg\n");
192 goto free_and_return;
193 }
194
195 v9fs_put_trans(clnt->trans_mod);
196 clnt->trans_mod = v9fs_get_trans_by_name(s);
197 if (clnt->trans_mod == NULL) {
198 pr_info("Could not find request transport: %s\n",
199 s);
200 ret = -EINVAL;
201 }
202 kfree(s);
203 break;
204 case Opt_legacy:
205 clnt->proto_version = p9_proto_legacy;
206 break;
207 case Opt_version:
208 s = match_strdup(&args[0]);
209 if (!s) {
210 ret = -ENOMEM;
211 p9_debug(P9_DEBUG_ERROR,
212 "problem allocating copy of version arg\n");
213 goto free_and_return;
214 }
215 r = get_protocol_version(s);
216 if (r < 0)
217 ret = r;
218 else
219 clnt->proto_version = r;
220 kfree(s);
221 break;
222 default:
223 continue;
224 }
225 }
226
227 free_and_return:
228 if (ret)
229 v9fs_put_trans(clnt->trans_mod);
230 kfree(tmp_options);
231 return ret;
232 }
233
234 static struct p9_fcall *p9_fcall_alloc(int alloc_msize)
235 {
236 struct p9_fcall *fc;
237 fc = kmalloc(sizeof(struct p9_fcall) + alloc_msize, GFP_NOFS);
238 if (!fc)
239 return NULL;
240 fc->capacity = alloc_msize;
241 fc->sdata = (char *) fc + sizeof(struct p9_fcall);
242 return fc;
243 }
244
245 /**
246 * p9_tag_alloc - lookup/allocate a request by tag
247 * @c: client session to lookup tag within
248 * @tag: numeric id for transaction
249 *
250 * this is a simple array lookup, but will grow the
251 * request_slots as necessary to accommodate transaction
252 * ids which did not previously have a slot.
253 *
254 * this code relies on the client spinlock to manage locks, its
255 * possible we should switch to something else, but I'd rather
256 * stick with something low-overhead for the common case.
257 *
258 */
259
260 static struct p9_req_t *
261 p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
262 {
263 unsigned long flags;
264 int row, col;
265 struct p9_req_t *req;
266 int alloc_msize = min(c->msize, max_size);
267
268 /* This looks up the original request by tag so we know which
269 * buffer to read the data into */
270 tag++;
271
272 if (tag >= c->max_tag) {
273 spin_lock_irqsave(&c->lock, flags);
274 /* check again since original check was outside of lock */
275 while (tag >= c->max_tag) {
276 row = (tag / P9_ROW_MAXTAG);
277 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
278 sizeof(struct p9_req_t), GFP_ATOMIC);
279
280 if (!c->reqs[row]) {
281 pr_err("Couldn't grow tag array\n");
282 spin_unlock_irqrestore(&c->lock, flags);
283 return ERR_PTR(-ENOMEM);
284 }
285 for (col = 0; col < P9_ROW_MAXTAG; col++) {
286 req = &c->reqs[row][col];
287 req->status = REQ_STATUS_IDLE;
288 init_waitqueue_head(&req->wq);
289 }
290 c->max_tag += P9_ROW_MAXTAG;
291 }
292 spin_unlock_irqrestore(&c->lock, flags);
293 }
294 row = tag / P9_ROW_MAXTAG;
295 col = tag % P9_ROW_MAXTAG;
296
297 req = &c->reqs[row][col];
298 if (!req->tc)
299 req->tc = p9_fcall_alloc(alloc_msize);
300 if (!req->rc)
301 req->rc = p9_fcall_alloc(alloc_msize);
302 if (!req->tc || !req->rc)
303 goto grow_failed;
304
305 p9pdu_reset(req->tc);
306 p9pdu_reset(req->rc);
307
308 req->tc->tag = tag-1;
309 req->status = REQ_STATUS_ALLOC;
310
311 return req;
312
313 grow_failed:
314 pr_err("Couldn't grow tag array\n");
315 kfree(req->tc);
316 kfree(req->rc);
317 req->tc = req->rc = NULL;
318 return ERR_PTR(-ENOMEM);
319 }
320
321 /**
322 * p9_tag_lookup - lookup a request by tag
323 * @c: client session to lookup tag within
324 * @tag: numeric id for transaction
325 *
326 */
327
328 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
329 {
330 int row, col;
331
332 /* This looks up the original request by tag so we know which
333 * buffer to read the data into */
334 tag++;
335
336 if (tag >= c->max_tag)
337 return NULL;
338
339 row = tag / P9_ROW_MAXTAG;
340 col = tag % P9_ROW_MAXTAG;
341
342 return &c->reqs[row][col];
343 }
344 EXPORT_SYMBOL(p9_tag_lookup);
345
346 /**
347 * p9_tag_init - setup tags structure and contents
348 * @c: v9fs client struct
349 *
350 * This initializes the tags structure for each client instance.
351 *
352 */
353
354 static int p9_tag_init(struct p9_client *c)
355 {
356 int err = 0;
357
358 c->tagpool = p9_idpool_create();
359 if (IS_ERR(c->tagpool)) {
360 err = PTR_ERR(c->tagpool);
361 goto error;
362 }
363 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
364 if (err < 0) {
365 p9_idpool_destroy(c->tagpool);
366 goto error;
367 }
368 c->max_tag = 0;
369 error:
370 return err;
371 }
372
373 /**
374 * p9_tag_cleanup - cleans up tags structure and reclaims resources
375 * @c: v9fs client struct
376 *
377 * This frees resources associated with the tags structure
378 *
379 */
380 static void p9_tag_cleanup(struct p9_client *c)
381 {
382 int row, col;
383
384 /* check to insure all requests are idle */
385 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
386 for (col = 0; col < P9_ROW_MAXTAG; col++) {
387 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
388 p9_debug(P9_DEBUG_MUX,
389 "Attempting to cleanup non-free tag %d,%d\n",
390 row, col);
391 /* TODO: delay execution of cleanup */
392 return;
393 }
394 }
395 }
396
397 if (c->tagpool) {
398 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
399 p9_idpool_destroy(c->tagpool);
400 }
401
402 /* free requests associated with tags */
403 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
404 for (col = 0; col < P9_ROW_MAXTAG; col++) {
405 kfree(c->reqs[row][col].tc);
406 kfree(c->reqs[row][col].rc);
407 }
408 kfree(c->reqs[row]);
409 }
410 c->max_tag = 0;
411 }
412
413 /**
414 * p9_free_req - free a request and clean-up as necessary
415 * c: client state
416 * r: request to release
417 *
418 */
419
420 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
421 {
422 int tag = r->tc->tag;
423 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
424
425 r->status = REQ_STATUS_IDLE;
426 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
427 p9_idpool_put(tag, c->tagpool);
428 }
429
430 /**
431 * p9_client_cb - call back from transport to client
432 * c: client state
433 * req: request received
434 *
435 */
436 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status)
437 {
438 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
439
440 /*
441 * This barrier is needed to make sure any change made to req before
442 * the status change is visible to another thread
443 */
444 smp_wmb();
445 req->status = status;
446
447 wake_up(&req->wq);
448 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
449 }
450 EXPORT_SYMBOL(p9_client_cb);
451
452 /**
453 * p9_parse_header - parse header arguments out of a packet
454 * @pdu: packet to parse
455 * @size: size of packet
456 * @type: type of request
457 * @tag: tag of packet
458 * @rewind: set if we need to rewind offset afterwards
459 */
460
461 int
462 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
463 int rewind)
464 {
465 int8_t r_type;
466 int16_t r_tag;
467 int32_t r_size;
468 int offset = pdu->offset;
469 int err;
470
471 pdu->offset = 0;
472
473 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
474 if (err)
475 goto rewind_and_exit;
476
477 if (type)
478 *type = r_type;
479 if (tag)
480 *tag = r_tag;
481 if (size)
482 *size = r_size;
483
484 if (pdu->size != r_size || r_size < 7) {
485 err = -EINVAL;
486 goto rewind_and_exit;
487 }
488
489 pdu->id = r_type;
490 pdu->tag = r_tag;
491
492 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
493 pdu->size, pdu->id, pdu->tag);
494
495 rewind_and_exit:
496 if (rewind)
497 pdu->offset = offset;
498 return err;
499 }
500 EXPORT_SYMBOL(p9_parse_header);
501
502 /**
503 * p9_check_errors - check 9p packet for error return and process it
504 * @c: current client instance
505 * @req: request to parse and check for error conditions
506 *
507 * returns error code if one is discovered, otherwise returns 0
508 *
509 * this will have to be more complicated if we have multiple
510 * error packet types
511 */
512
513 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
514 {
515 int8_t type;
516 int err;
517 int ecode;
518
519 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
520 if (req->rc->size >= c->msize) {
521 p9_debug(P9_DEBUG_ERROR,
522 "requested packet size too big: %d\n",
523 req->rc->size);
524 return -EIO;
525 }
526 /*
527 * dump the response from server
528 * This should be after check errors which poplulate pdu_fcall.
529 */
530 trace_9p_protocol_dump(c, req->rc);
531 if (err) {
532 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
533 return err;
534 }
535 if (type != P9_RERROR && type != P9_RLERROR)
536 return 0;
537
538 if (!p9_is_proto_dotl(c)) {
539 char *ename;
540 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
541 &ename, &ecode);
542 if (err)
543 goto out_err;
544
545 if (p9_is_proto_dotu(c) && ecode < 512)
546 err = -ecode;
547
548 if (!err) {
549 err = p9_errstr2errno(ename, strlen(ename));
550
551 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
552 -ecode, ename);
553 }
554 kfree(ename);
555 } else {
556 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
557 err = -ecode;
558
559 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
560 }
561
562 return err;
563
564 out_err:
565 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
566
567 return err;
568 }
569
570 /**
571 * p9_check_zc_errors - check 9p packet for error return and process it
572 * @c: current client instance
573 * @req: request to parse and check for error conditions
574 * @in_hdrlen: Size of response protocol buffer.
575 *
576 * returns error code if one is discovered, otherwise returns 0
577 *
578 * this will have to be more complicated if we have multiple
579 * error packet types
580 */
581
582 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
583 struct iov_iter *uidata, int in_hdrlen)
584 {
585 int err;
586 int ecode;
587 int8_t type;
588 char *ename = NULL;
589
590 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
591 /*
592 * dump the response from server
593 * This should be after parse_header which poplulate pdu_fcall.
594 */
595 trace_9p_protocol_dump(c, req->rc);
596 if (err) {
597 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
598 return err;
599 }
600
601 if (type != P9_RERROR && type != P9_RLERROR)
602 return 0;
603
604 if (!p9_is_proto_dotl(c)) {
605 /* Error is reported in string format */
606 int len;
607 /* 7 = header size for RERROR; */
608 int inline_len = in_hdrlen - 7;
609
610 len = req->rc->size - req->rc->offset;
611 if (len > (P9_ZC_HDR_SZ - 7)) {
612 err = -EFAULT;
613 goto out_err;
614 }
615
616 ename = &req->rc->sdata[req->rc->offset];
617 if (len > inline_len) {
618 /* We have error in external buffer */
619 if (!copy_from_iter_full(ename + inline_len,
620 len - inline_len, uidata)) {
621 err = -EFAULT;
622 goto out_err;
623 }
624 }
625 ename = NULL;
626 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
627 &ename, &ecode);
628 if (err)
629 goto out_err;
630
631 if (p9_is_proto_dotu(c) && ecode < 512)
632 err = -ecode;
633
634 if (!err) {
635 err = p9_errstr2errno(ename, strlen(ename));
636
637 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
638 -ecode, ename);
639 }
640 kfree(ename);
641 } else {
642 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
643 err = -ecode;
644
645 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
646 }
647 return err;
648
649 out_err:
650 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
651 return err;
652 }
653
654 static struct p9_req_t *
655 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
656
657 /**
658 * p9_client_flush - flush (cancel) a request
659 * @c: client state
660 * @oldreq: request to cancel
661 *
662 * This sents a flush for a particular request and links
663 * the flush request to the original request. The current
664 * code only supports a single flush request although the protocol
665 * allows for multiple flush requests to be sent for a single request.
666 *
667 */
668
669 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
670 {
671 struct p9_req_t *req;
672 int16_t oldtag;
673 int err;
674
675 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
676 if (err)
677 return err;
678
679 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
680
681 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
682 if (IS_ERR(req))
683 return PTR_ERR(req);
684
685 /*
686 * if we haven't received a response for oldreq,
687 * remove it from the list
688 */
689 if (oldreq->status == REQ_STATUS_SENT)
690 if (c->trans_mod->cancelled)
691 c->trans_mod->cancelled(c, oldreq);
692
693 p9_free_req(c, req);
694 return 0;
695 }
696
697 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
698 int8_t type, int req_size,
699 const char *fmt, va_list ap)
700 {
701 int tag, err;
702 struct p9_req_t *req;
703
704 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
705
706 /* we allow for any status other than disconnected */
707 if (c->status == Disconnected)
708 return ERR_PTR(-EIO);
709
710 /* if status is begin_disconnected we allow only clunk request */
711 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
712 return ERR_PTR(-EIO);
713
714 tag = P9_NOTAG;
715 if (type != P9_TVERSION) {
716 tag = p9_idpool_get(c->tagpool);
717 if (tag < 0)
718 return ERR_PTR(-ENOMEM);
719 }
720
721 req = p9_tag_alloc(c, tag, req_size);
722 if (IS_ERR(req))
723 return req;
724
725 /* marshall the data */
726 p9pdu_prepare(req->tc, tag, type);
727 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
728 if (err)
729 goto reterr;
730 p9pdu_finalize(c, req->tc);
731 trace_9p_client_req(c, type, tag);
732 return req;
733 reterr:
734 p9_free_req(c, req);
735 return ERR_PTR(err);
736 }
737
738 /**
739 * p9_client_rpc - issue a request and wait for a response
740 * @c: client session
741 * @type: type of request
742 * @fmt: protocol format string (see protocol.c)
743 *
744 * Returns request structure (which client must free using p9_free_req)
745 */
746
747 static struct p9_req_t *
748 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
749 {
750 va_list ap;
751 int sigpending, err;
752 unsigned long flags;
753 struct p9_req_t *req;
754
755 va_start(ap, fmt);
756 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
757 va_end(ap);
758 if (IS_ERR(req))
759 return req;
760
761 if (signal_pending(current)) {
762 sigpending = 1;
763 clear_thread_flag(TIF_SIGPENDING);
764 } else
765 sigpending = 0;
766
767 err = c->trans_mod->request(c, req);
768 if (err < 0) {
769 if (err != -ERESTARTSYS && err != -EFAULT)
770 c->status = Disconnected;
771 goto recalc_sigpending;
772 }
773 again:
774 /* Wait for the response */
775 err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD);
776
777 /*
778 * Make sure our req is coherent with regard to updates in other
779 * threads - echoes to wmb() in the callback
780 */
781 smp_rmb();
782
783 if ((err == -ERESTARTSYS) && (c->status == Connected)
784 && (type == P9_TFLUSH)) {
785 sigpending = 1;
786 clear_thread_flag(TIF_SIGPENDING);
787 goto again;
788 }
789
790 if (req->status == REQ_STATUS_ERROR) {
791 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
792 err = req->t_err;
793 }
794 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
795 p9_debug(P9_DEBUG_MUX, "flushing\n");
796 sigpending = 1;
797 clear_thread_flag(TIF_SIGPENDING);
798
799 if (c->trans_mod->cancel(c, req))
800 p9_client_flush(c, req);
801
802 /* if we received the response anyway, don't signal error */
803 if (req->status == REQ_STATUS_RCVD)
804 err = 0;
805 }
806 recalc_sigpending:
807 if (sigpending) {
808 spin_lock_irqsave(&current->sighand->siglock, flags);
809 recalc_sigpending();
810 spin_unlock_irqrestore(&current->sighand->siglock, flags);
811 }
812 if (err < 0)
813 goto reterr;
814
815 err = p9_check_errors(c, req);
816 trace_9p_client_res(c, type, req->rc->tag, err);
817 if (!err)
818 return req;
819 reterr:
820 p9_free_req(c, req);
821 return ERR_PTR(safe_errno(err));
822 }
823
824 /**
825 * p9_client_zc_rpc - issue a request and wait for a response
826 * @c: client session
827 * @type: type of request
828 * @uidata: destination for zero copy read
829 * @uodata: source for zero copy write
830 * @inlen: read buffer size
831 * @olen: write buffer size
832 * @hdrlen: reader header size, This is the size of response protocol data
833 * @fmt: protocol format string (see protocol.c)
834 *
835 * Returns request structure (which client must free using p9_free_req)
836 */
837 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
838 struct iov_iter *uidata,
839 struct iov_iter *uodata,
840 int inlen, int olen, int in_hdrlen,
841 const char *fmt, ...)
842 {
843 va_list ap;
844 int sigpending, err;
845 unsigned long flags;
846 struct p9_req_t *req;
847
848 va_start(ap, fmt);
849 /*
850 * We allocate a inline protocol data of only 4k bytes.
851 * The actual content is passed in zero-copy fashion.
852 */
853 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
854 va_end(ap);
855 if (IS_ERR(req))
856 return req;
857
858 if (signal_pending(current)) {
859 sigpending = 1;
860 clear_thread_flag(TIF_SIGPENDING);
861 } else
862 sigpending = 0;
863
864 err = c->trans_mod->zc_request(c, req, uidata, uodata,
865 inlen, olen, in_hdrlen);
866 if (err < 0) {
867 if (err == -EIO)
868 c->status = Disconnected;
869 if (err != -ERESTARTSYS)
870 goto recalc_sigpending;
871 }
872 if (req->status == REQ_STATUS_ERROR) {
873 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
874 err = req->t_err;
875 }
876 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
877 p9_debug(P9_DEBUG_MUX, "flushing\n");
878 sigpending = 1;
879 clear_thread_flag(TIF_SIGPENDING);
880
881 if (c->trans_mod->cancel(c, req))
882 p9_client_flush(c, req);
883
884 /* if we received the response anyway, don't signal error */
885 if (req->status == REQ_STATUS_RCVD)
886 err = 0;
887 }
888 recalc_sigpending:
889 if (sigpending) {
890 spin_lock_irqsave(&current->sighand->siglock, flags);
891 recalc_sigpending();
892 spin_unlock_irqrestore(&current->sighand->siglock, flags);
893 }
894 if (err < 0)
895 goto reterr;
896
897 err = p9_check_zc_errors(c, req, uidata, in_hdrlen);
898 trace_9p_client_res(c, type, req->rc->tag, err);
899 if (!err)
900 return req;
901 reterr:
902 p9_free_req(c, req);
903 return ERR_PTR(safe_errno(err));
904 }
905
906 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
907 {
908 int ret;
909 struct p9_fid *fid;
910
911 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
912 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
913 if (!fid)
914 return NULL;
915
916 memset(&fid->qid, 0, sizeof(struct p9_qid));
917 fid->mode = -1;
918 fid->uid = current_fsuid();
919 fid->clnt = clnt;
920 fid->rdir = NULL;
921 fid->fid = 0;
922
923 idr_preload(GFP_KERNEL);
924 spin_lock_irq(&clnt->lock);
925 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1,
926 GFP_NOWAIT);
927 spin_unlock_irq(&clnt->lock);
928 idr_preload_end();
929
930 if (!ret)
931 return fid;
932
933 kfree(fid);
934 return NULL;
935 }
936
937 static void p9_fid_destroy(struct p9_fid *fid)
938 {
939 struct p9_client *clnt;
940 unsigned long flags;
941
942 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
943 clnt = fid->clnt;
944 spin_lock_irqsave(&clnt->lock, flags);
945 idr_remove(&clnt->fids, fid->fid);
946 spin_unlock_irqrestore(&clnt->lock, flags);
947 kfree(fid->rdir);
948 kfree(fid);
949 }
950
951 static int p9_client_version(struct p9_client *c)
952 {
953 int err = 0;
954 struct p9_req_t *req;
955 char *version = NULL;
956 int msize;
957
958 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
959 c->msize, c->proto_version);
960
961 switch (c->proto_version) {
962 case p9_proto_2000L:
963 req = p9_client_rpc(c, P9_TVERSION, "ds",
964 c->msize, "9P2000.L");
965 break;
966 case p9_proto_2000u:
967 req = p9_client_rpc(c, P9_TVERSION, "ds",
968 c->msize, "9P2000.u");
969 break;
970 case p9_proto_legacy:
971 req = p9_client_rpc(c, P9_TVERSION, "ds",
972 c->msize, "9P2000");
973 break;
974 default:
975 return -EINVAL;
976 }
977
978 if (IS_ERR(req))
979 return PTR_ERR(req);
980
981 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
982 if (err) {
983 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
984 trace_9p_protocol_dump(c, req->rc);
985 goto error;
986 }
987
988 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
989 if (!strncmp(version, "9P2000.L", 8))
990 c->proto_version = p9_proto_2000L;
991 else if (!strncmp(version, "9P2000.u", 8))
992 c->proto_version = p9_proto_2000u;
993 else if (!strncmp(version, "9P2000", 6))
994 c->proto_version = p9_proto_legacy;
995 else {
996 err = -EREMOTEIO;
997 goto error;
998 }
999
1000 if (msize < c->msize)
1001 c->msize = msize;
1002
1003 error:
1004 kfree(version);
1005 p9_free_req(c, req);
1006
1007 return err;
1008 }
1009
1010 struct p9_client *p9_client_create(const char *dev_name, char *options)
1011 {
1012 int err;
1013 struct p9_client *clnt;
1014 char *client_id;
1015
1016 err = 0;
1017 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
1018 if (!clnt)
1019 return ERR_PTR(-ENOMEM);
1020
1021 clnt->trans_mod = NULL;
1022 clnt->trans = NULL;
1023
1024 client_id = utsname()->nodename;
1025 memcpy(clnt->name, client_id, strlen(client_id) + 1);
1026
1027 spin_lock_init(&clnt->lock);
1028 idr_init(&clnt->fids);
1029
1030 err = p9_tag_init(clnt);
1031 if (err < 0)
1032 goto free_client;
1033
1034 err = parse_opts(options, clnt);
1035 if (err < 0)
1036 goto destroy_tagpool;
1037
1038 if (!clnt->trans_mod)
1039 clnt->trans_mod = v9fs_get_default_trans();
1040
1041 if (clnt->trans_mod == NULL) {
1042 err = -EPROTONOSUPPORT;
1043 p9_debug(P9_DEBUG_ERROR,
1044 "No transport defined or default transport\n");
1045 goto destroy_tagpool;
1046 }
1047
1048 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1049 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1050
1051 err = clnt->trans_mod->create(clnt, dev_name, options);
1052 if (err)
1053 goto put_trans;
1054
1055 if (clnt->msize > clnt->trans_mod->maxsize)
1056 clnt->msize = clnt->trans_mod->maxsize;
1057
1058 err = p9_client_version(clnt);
1059 if (err)
1060 goto close_trans;
1061
1062 return clnt;
1063
1064 close_trans:
1065 clnt->trans_mod->close(clnt);
1066 put_trans:
1067 v9fs_put_trans(clnt->trans_mod);
1068 destroy_tagpool:
1069 p9_idpool_destroy(clnt->tagpool);
1070 free_client:
1071 kfree(clnt);
1072 return ERR_PTR(err);
1073 }
1074 EXPORT_SYMBOL(p9_client_create);
1075
1076 void p9_client_destroy(struct p9_client *clnt)
1077 {
1078 struct p9_fid *fid;
1079 int id;
1080
1081 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1082
1083 if (clnt->trans_mod)
1084 clnt->trans_mod->close(clnt);
1085
1086 v9fs_put_trans(clnt->trans_mod);
1087
1088 idr_for_each_entry(&clnt->fids, fid, id) {
1089 pr_info("Found fid %d not clunked\n", fid->fid);
1090 p9_fid_destroy(fid);
1091 }
1092
1093 p9_tag_cleanup(clnt);
1094
1095 kfree(clnt);
1096 }
1097 EXPORT_SYMBOL(p9_client_destroy);
1098
1099 void p9_client_disconnect(struct p9_client *clnt)
1100 {
1101 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1102 clnt->status = Disconnected;
1103 }
1104 EXPORT_SYMBOL(p9_client_disconnect);
1105
1106 void p9_client_begin_disconnect(struct p9_client *clnt)
1107 {
1108 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1109 clnt->status = BeginDisconnect;
1110 }
1111 EXPORT_SYMBOL(p9_client_begin_disconnect);
1112
1113 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1114 const char *uname, kuid_t n_uname, const char *aname)
1115 {
1116 int err = 0;
1117 struct p9_req_t *req;
1118 struct p9_fid *fid;
1119 struct p9_qid qid;
1120
1121
1122 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1123 afid ? afid->fid : -1, uname, aname);
1124 fid = p9_fid_create(clnt);
1125 if (!fid) {
1126 err = -ENOMEM;
1127 goto error;
1128 }
1129 fid->uid = n_uname;
1130
1131 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1132 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1133 if (IS_ERR(req)) {
1134 err = PTR_ERR(req);
1135 goto error;
1136 }
1137
1138 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
1139 if (err) {
1140 trace_9p_protocol_dump(clnt, req->rc);
1141 p9_free_req(clnt, req);
1142 goto error;
1143 }
1144
1145 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1146 qid.type, (unsigned long long)qid.path, qid.version);
1147
1148 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1149
1150 p9_free_req(clnt, req);
1151 return fid;
1152
1153 error:
1154 if (fid)
1155 p9_fid_destroy(fid);
1156 return ERR_PTR(err);
1157 }
1158 EXPORT_SYMBOL(p9_client_attach);
1159
1160 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1161 const unsigned char * const *wnames, int clone)
1162 {
1163 int err;
1164 struct p9_client *clnt;
1165 struct p9_fid *fid;
1166 struct p9_qid *wqids;
1167 struct p9_req_t *req;
1168 uint16_t nwqids, count;
1169
1170 err = 0;
1171 wqids = NULL;
1172 clnt = oldfid->clnt;
1173 if (clone) {
1174 fid = p9_fid_create(clnt);
1175 if (!fid) {
1176 err = -ENOMEM;
1177 goto error;
1178 }
1179
1180 fid->uid = oldfid->uid;
1181 } else
1182 fid = oldfid;
1183
1184
1185 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1186 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1187
1188 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1189 nwname, wnames);
1190 if (IS_ERR(req)) {
1191 err = PTR_ERR(req);
1192 goto error;
1193 }
1194
1195 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1196 if (err) {
1197 trace_9p_protocol_dump(clnt, req->rc);
1198 p9_free_req(clnt, req);
1199 goto clunk_fid;
1200 }
1201 p9_free_req(clnt, req);
1202
1203 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1204
1205 if (nwqids != nwname) {
1206 err = -ENOENT;
1207 goto clunk_fid;
1208 }
1209
1210 for (count = 0; count < nwqids; count++)
1211 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1212 count, wqids[count].type,
1213 (unsigned long long)wqids[count].path,
1214 wqids[count].version);
1215
1216 if (nwname)
1217 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1218 else
1219 fid->qid = oldfid->qid;
1220
1221 kfree(wqids);
1222 return fid;
1223
1224 clunk_fid:
1225 kfree(wqids);
1226 p9_client_clunk(fid);
1227 fid = NULL;
1228
1229 error:
1230 if (fid && (fid != oldfid))
1231 p9_fid_destroy(fid);
1232
1233 return ERR_PTR(err);
1234 }
1235 EXPORT_SYMBOL(p9_client_walk);
1236
1237 int p9_client_open(struct p9_fid *fid, int mode)
1238 {
1239 int err;
1240 struct p9_client *clnt;
1241 struct p9_req_t *req;
1242 struct p9_qid qid;
1243 int iounit;
1244
1245 clnt = fid->clnt;
1246 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1247 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1248 err = 0;
1249
1250 if (fid->mode != -1)
1251 return -EINVAL;
1252
1253 if (p9_is_proto_dotl(clnt))
1254 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1255 else
1256 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1257 if (IS_ERR(req)) {
1258 err = PTR_ERR(req);
1259 goto error;
1260 }
1261
1262 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1263 if (err) {
1264 trace_9p_protocol_dump(clnt, req->rc);
1265 goto free_and_error;
1266 }
1267
1268 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1269 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1270 (unsigned long long)qid.path, qid.version, iounit);
1271
1272 fid->mode = mode;
1273 fid->iounit = iounit;
1274
1275 free_and_error:
1276 p9_free_req(clnt, req);
1277 error:
1278 return err;
1279 }
1280 EXPORT_SYMBOL(p9_client_open);
1281
1282 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode,
1283 kgid_t gid, struct p9_qid *qid)
1284 {
1285 int err = 0;
1286 struct p9_client *clnt;
1287 struct p9_req_t *req;
1288 int iounit;
1289
1290 p9_debug(P9_DEBUG_9P,
1291 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1292 ofid->fid, name, flags, mode,
1293 from_kgid(&init_user_ns, gid));
1294 clnt = ofid->clnt;
1295
1296 if (ofid->mode != -1)
1297 return -EINVAL;
1298
1299 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1300 mode, gid);
1301 if (IS_ERR(req)) {
1302 err = PTR_ERR(req);
1303 goto error;
1304 }
1305
1306 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1307 if (err) {
1308 trace_9p_protocol_dump(clnt, req->rc);
1309 goto free_and_error;
1310 }
1311
1312 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1313 qid->type,
1314 (unsigned long long)qid->path,
1315 qid->version, iounit);
1316
1317 ofid->mode = mode;
1318 ofid->iounit = iounit;
1319
1320 free_and_error:
1321 p9_free_req(clnt, req);
1322 error:
1323 return err;
1324 }
1325 EXPORT_SYMBOL(p9_client_create_dotl);
1326
1327 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode,
1328 char *extension)
1329 {
1330 int err;
1331 struct p9_client *clnt;
1332 struct p9_req_t *req;
1333 struct p9_qid qid;
1334 int iounit;
1335
1336 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1337 fid->fid, name, perm, mode);
1338 err = 0;
1339 clnt = fid->clnt;
1340
1341 if (fid->mode != -1)
1342 return -EINVAL;
1343
1344 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1345 mode, extension);
1346 if (IS_ERR(req)) {
1347 err = PTR_ERR(req);
1348 goto error;
1349 }
1350
1351 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1352 if (err) {
1353 trace_9p_protocol_dump(clnt, req->rc);
1354 goto free_and_error;
1355 }
1356
1357 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1358 qid.type,
1359 (unsigned long long)qid.path,
1360 qid.version, iounit);
1361
1362 fid->mode = mode;
1363 fid->iounit = iounit;
1364
1365 free_and_error:
1366 p9_free_req(clnt, req);
1367 error:
1368 return err;
1369 }
1370 EXPORT_SYMBOL(p9_client_fcreate);
1371
1372 int p9_client_symlink(struct p9_fid *dfid, const char *name,
1373 const char *symtgt, kgid_t gid, struct p9_qid *qid)
1374 {
1375 int err = 0;
1376 struct p9_client *clnt;
1377 struct p9_req_t *req;
1378
1379 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1380 dfid->fid, name, symtgt);
1381 clnt = dfid->clnt;
1382
1383 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1384 gid);
1385 if (IS_ERR(req)) {
1386 err = PTR_ERR(req);
1387 goto error;
1388 }
1389
1390 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1391 if (err) {
1392 trace_9p_protocol_dump(clnt, req->rc);
1393 goto free_and_error;
1394 }
1395
1396 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1397 qid->type, (unsigned long long)qid->path, qid->version);
1398
1399 free_and_error:
1400 p9_free_req(clnt, req);
1401 error:
1402 return err;
1403 }
1404 EXPORT_SYMBOL(p9_client_symlink);
1405
1406 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname)
1407 {
1408 struct p9_client *clnt;
1409 struct p9_req_t *req;
1410
1411 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1412 dfid->fid, oldfid->fid, newname);
1413 clnt = dfid->clnt;
1414 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1415 newname);
1416 if (IS_ERR(req))
1417 return PTR_ERR(req);
1418
1419 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1420 p9_free_req(clnt, req);
1421 return 0;
1422 }
1423 EXPORT_SYMBOL(p9_client_link);
1424
1425 int p9_client_fsync(struct p9_fid *fid, int datasync)
1426 {
1427 int err;
1428 struct p9_client *clnt;
1429 struct p9_req_t *req;
1430
1431 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1432 fid->fid, datasync);
1433 err = 0;
1434 clnt = fid->clnt;
1435
1436 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1437 if (IS_ERR(req)) {
1438 err = PTR_ERR(req);
1439 goto error;
1440 }
1441
1442 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1443
1444 p9_free_req(clnt, req);
1445
1446 error:
1447 return err;
1448 }
1449 EXPORT_SYMBOL(p9_client_fsync);
1450
1451 int p9_client_clunk(struct p9_fid *fid)
1452 {
1453 int err;
1454 struct p9_client *clnt;
1455 struct p9_req_t *req;
1456 int retries = 0;
1457
1458 if (!fid) {
1459 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1460 __func__, task_pid_nr(current));
1461 dump_stack();
1462 return 0;
1463 }
1464
1465 again:
1466 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1467 retries);
1468 err = 0;
1469 clnt = fid->clnt;
1470
1471 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1472 if (IS_ERR(req)) {
1473 err = PTR_ERR(req);
1474 goto error;
1475 }
1476
1477 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1478
1479 p9_free_req(clnt, req);
1480 error:
1481 /*
1482 * Fid is not valid even after a failed clunk
1483 * If interrupted, retry once then give up and
1484 * leak fid until umount.
1485 */
1486 if (err == -ERESTARTSYS) {
1487 if (retries++ == 0)
1488 goto again;
1489 } else
1490 p9_fid_destroy(fid);
1491 return err;
1492 }
1493 EXPORT_SYMBOL(p9_client_clunk);
1494
1495 int p9_client_remove(struct p9_fid *fid)
1496 {
1497 int err;
1498 struct p9_client *clnt;
1499 struct p9_req_t *req;
1500
1501 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1502 err = 0;
1503 clnt = fid->clnt;
1504
1505 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1506 if (IS_ERR(req)) {
1507 err = PTR_ERR(req);
1508 goto error;
1509 }
1510
1511 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1512
1513 p9_free_req(clnt, req);
1514 error:
1515 if (err == -ERESTARTSYS)
1516 p9_client_clunk(fid);
1517 else
1518 p9_fid_destroy(fid);
1519 return err;
1520 }
1521 EXPORT_SYMBOL(p9_client_remove);
1522
1523 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1524 {
1525 int err = 0;
1526 struct p9_req_t *req;
1527 struct p9_client *clnt;
1528
1529 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1530 dfid->fid, name, flags);
1531
1532 clnt = dfid->clnt;
1533 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1534 if (IS_ERR(req)) {
1535 err = PTR_ERR(req);
1536 goto error;
1537 }
1538 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1539
1540 p9_free_req(clnt, req);
1541 error:
1542 return err;
1543 }
1544 EXPORT_SYMBOL(p9_client_unlinkat);
1545
1546 int
1547 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
1548 {
1549 struct p9_client *clnt = fid->clnt;
1550 struct p9_req_t *req;
1551 int total = 0;
1552 *err = 0;
1553
1554 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1555 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to));
1556
1557 while (iov_iter_count(to)) {
1558 int count = iov_iter_count(to);
1559 int rsize, non_zc = 0;
1560 char *dataptr;
1561
1562 rsize = fid->iounit;
1563 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1564 rsize = clnt->msize - P9_IOHDRSZ;
1565
1566 if (count < rsize)
1567 rsize = count;
1568
1569 /* Don't bother zerocopy for small IO (< 1024) */
1570 if (clnt->trans_mod->zc_request && rsize > 1024) {
1571 /*
1572 * response header len is 11
1573 * PDU Header(7) + IO Size (4)
1574 */
1575 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize,
1576 0, 11, "dqd", fid->fid,
1577 offset, rsize);
1578 } else {
1579 non_zc = 1;
1580 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1581 rsize);
1582 }
1583 if (IS_ERR(req)) {
1584 *err = PTR_ERR(req);
1585 break;
1586 }
1587
1588 *err = p9pdu_readf(req->rc, clnt->proto_version,
1589 "D", &count, &dataptr);
1590 if (*err) {
1591 trace_9p_protocol_dump(clnt, req->rc);
1592 p9_free_req(clnt, req);
1593 break;
1594 }
1595 if (rsize < count) {
1596 pr_err("bogus RREAD count (%d > %d)\n", count, rsize);
1597 count = rsize;
1598 }
1599
1600 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1601 if (!count) {
1602 p9_free_req(clnt, req);
1603 break;
1604 }
1605
1606 if (non_zc) {
1607 int n = copy_to_iter(dataptr, count, to);
1608 total += n;
1609 offset += n;
1610 if (n != count) {
1611 *err = -EFAULT;
1612 p9_free_req(clnt, req);
1613 break;
1614 }
1615 } else {
1616 iov_iter_advance(to, count);
1617 total += count;
1618 offset += count;
1619 }
1620 p9_free_req(clnt, req);
1621 }
1622 return total;
1623 }
1624 EXPORT_SYMBOL(p9_client_read);
1625
1626 int
1627 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
1628 {
1629 struct p9_client *clnt = fid->clnt;
1630 struct p9_req_t *req;
1631 int total = 0;
1632 *err = 0;
1633
1634 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n",
1635 fid->fid, (unsigned long long) offset,
1636 iov_iter_count(from));
1637
1638 while (iov_iter_count(from)) {
1639 int count = iov_iter_count(from);
1640 int rsize = fid->iounit;
1641 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1642 rsize = clnt->msize - P9_IOHDRSZ;
1643
1644 if (count < rsize)
1645 rsize = count;
1646
1647 /* Don't bother zerocopy for small IO (< 1024) */
1648 if (clnt->trans_mod->zc_request && rsize > 1024) {
1649 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0,
1650 rsize, P9_ZC_HDR_SZ, "dqd",
1651 fid->fid, offset, rsize);
1652 } else {
1653 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
1654 offset, rsize, from);
1655 }
1656 if (IS_ERR(req)) {
1657 *err = PTR_ERR(req);
1658 break;
1659 }
1660
1661 *err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1662 if (*err) {
1663 trace_9p_protocol_dump(clnt, req->rc);
1664 p9_free_req(clnt, req);
1665 break;
1666 }
1667 if (rsize < count) {
1668 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize);
1669 count = rsize;
1670 }
1671
1672 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1673
1674 p9_free_req(clnt, req);
1675 iov_iter_advance(from, count);
1676 total += count;
1677 offset += count;
1678 }
1679 return total;
1680 }
1681 EXPORT_SYMBOL(p9_client_write);
1682
1683 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1684 {
1685 int err;
1686 struct p9_client *clnt;
1687 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1688 struct p9_req_t *req;
1689 u16 ignored;
1690
1691 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1692
1693 if (!ret)
1694 return ERR_PTR(-ENOMEM);
1695
1696 err = 0;
1697 clnt = fid->clnt;
1698
1699 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1700 if (IS_ERR(req)) {
1701 err = PTR_ERR(req);
1702 goto error;
1703 }
1704
1705 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1706 if (err) {
1707 trace_9p_protocol_dump(clnt, req->rc);
1708 p9_free_req(clnt, req);
1709 goto error;
1710 }
1711
1712 p9_debug(P9_DEBUG_9P,
1713 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1714 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1715 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1716 "<<< uid=%d gid=%d n_muid=%d\n",
1717 ret->size, ret->type, ret->dev, ret->qid.type,
1718 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1719 ret->atime, ret->mtime, (unsigned long long)ret->length,
1720 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1721 from_kuid(&init_user_ns, ret->n_uid),
1722 from_kgid(&init_user_ns, ret->n_gid),
1723 from_kuid(&init_user_ns, ret->n_muid));
1724
1725 p9_free_req(clnt, req);
1726 return ret;
1727
1728 error:
1729 kfree(ret);
1730 return ERR_PTR(err);
1731 }
1732 EXPORT_SYMBOL(p9_client_stat);
1733
1734 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1735 u64 request_mask)
1736 {
1737 int err;
1738 struct p9_client *clnt;
1739 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1740 GFP_KERNEL);
1741 struct p9_req_t *req;
1742
1743 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1744 fid->fid, request_mask);
1745
1746 if (!ret)
1747 return ERR_PTR(-ENOMEM);
1748
1749 err = 0;
1750 clnt = fid->clnt;
1751
1752 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1753 if (IS_ERR(req)) {
1754 err = PTR_ERR(req);
1755 goto error;
1756 }
1757
1758 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1759 if (err) {
1760 trace_9p_protocol_dump(clnt, req->rc);
1761 p9_free_req(clnt, req);
1762 goto error;
1763 }
1764
1765 p9_debug(P9_DEBUG_9P,
1766 "<<< RGETATTR st_result_mask=%lld\n"
1767 "<<< qid=%x.%llx.%x\n"
1768 "<<< st_mode=%8.8x st_nlink=%llu\n"
1769 "<<< st_uid=%d st_gid=%d\n"
1770 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1771 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1772 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1773 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1774 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1775 "<<< st_gen=%lld st_data_version=%lld\n",
1776 ret->st_result_mask, ret->qid.type, ret->qid.path,
1777 ret->qid.version, ret->st_mode, ret->st_nlink,
1778 from_kuid(&init_user_ns, ret->st_uid),
1779 from_kgid(&init_user_ns, ret->st_gid),
1780 ret->st_rdev, ret->st_size, ret->st_blksize,
1781 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1782 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1783 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1784 ret->st_gen, ret->st_data_version);
1785
1786 p9_free_req(clnt, req);
1787 return ret;
1788
1789 error:
1790 kfree(ret);
1791 return ERR_PTR(err);
1792 }
1793 EXPORT_SYMBOL(p9_client_getattr_dotl);
1794
1795 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1796 {
1797 int ret;
1798
1799 /* NOTE: size shouldn't include its own length */
1800 /* size[2] type[2] dev[4] qid[13] */
1801 /* mode[4] atime[4] mtime[4] length[8]*/
1802 /* name[s] uid[s] gid[s] muid[s] */
1803 ret = 2+4+13+4+4+4+8+2+2+2+2;
1804
1805 if (wst->name)
1806 ret += strlen(wst->name);
1807 if (wst->uid)
1808 ret += strlen(wst->uid);
1809 if (wst->gid)
1810 ret += strlen(wst->gid);
1811 if (wst->muid)
1812 ret += strlen(wst->muid);
1813
1814 if ((proto_version == p9_proto_2000u) ||
1815 (proto_version == p9_proto_2000L)) {
1816 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1817 if (wst->extension)
1818 ret += strlen(wst->extension);
1819 }
1820
1821 return ret;
1822 }
1823
1824 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1825 {
1826 int err;
1827 struct p9_req_t *req;
1828 struct p9_client *clnt;
1829
1830 err = 0;
1831 clnt = fid->clnt;
1832 wst->size = p9_client_statsize(wst, clnt->proto_version);
1833 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1834 p9_debug(P9_DEBUG_9P,
1835 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1836 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1837 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1838 " uid=%d gid=%d n_muid=%d\n",
1839 wst->size, wst->type, wst->dev, wst->qid.type,
1840 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1841 wst->atime, wst->mtime, (unsigned long long)wst->length,
1842 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1843 from_kuid(&init_user_ns, wst->n_uid),
1844 from_kgid(&init_user_ns, wst->n_gid),
1845 from_kuid(&init_user_ns, wst->n_muid));
1846
1847 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1848 if (IS_ERR(req)) {
1849 err = PTR_ERR(req);
1850 goto error;
1851 }
1852
1853 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1854
1855 p9_free_req(clnt, req);
1856 error:
1857 return err;
1858 }
1859 EXPORT_SYMBOL(p9_client_wstat);
1860
1861 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1862 {
1863 int err;
1864 struct p9_req_t *req;
1865 struct p9_client *clnt;
1866
1867 err = 0;
1868 clnt = fid->clnt;
1869 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1870 p9_debug(P9_DEBUG_9P,
1871 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1872 " atime_sec=%lld atime_nsec=%lld\n"
1873 " mtime_sec=%lld mtime_nsec=%lld\n",
1874 p9attr->valid, p9attr->mode,
1875 from_kuid(&init_user_ns, p9attr->uid),
1876 from_kgid(&init_user_ns, p9attr->gid),
1877 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1878 p9attr->mtime_sec, p9attr->mtime_nsec);
1879
1880 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1881
1882 if (IS_ERR(req)) {
1883 err = PTR_ERR(req);
1884 goto error;
1885 }
1886 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1887 p9_free_req(clnt, req);
1888 error:
1889 return err;
1890 }
1891 EXPORT_SYMBOL(p9_client_setattr);
1892
1893 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1894 {
1895 int err;
1896 struct p9_req_t *req;
1897 struct p9_client *clnt;
1898
1899 err = 0;
1900 clnt = fid->clnt;
1901
1902 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1903
1904 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1905 if (IS_ERR(req)) {
1906 err = PTR_ERR(req);
1907 goto error;
1908 }
1909
1910 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1911 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1912 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1913 if (err) {
1914 trace_9p_protocol_dump(clnt, req->rc);
1915 p9_free_req(clnt, req);
1916 goto error;
1917 }
1918
1919 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1920 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1921 "fsid %llu namelen %ld\n",
1922 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1923 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1924 sb->fsid, (long int)sb->namelen);
1925
1926 p9_free_req(clnt, req);
1927 error:
1928 return err;
1929 }
1930 EXPORT_SYMBOL(p9_client_statfs);
1931
1932 int p9_client_rename(struct p9_fid *fid,
1933 struct p9_fid *newdirfid, const char *name)
1934 {
1935 int err;
1936 struct p9_req_t *req;
1937 struct p9_client *clnt;
1938
1939 err = 0;
1940 clnt = fid->clnt;
1941
1942 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1943 fid->fid, newdirfid->fid, name);
1944
1945 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1946 newdirfid->fid, name);
1947 if (IS_ERR(req)) {
1948 err = PTR_ERR(req);
1949 goto error;
1950 }
1951
1952 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1953
1954 p9_free_req(clnt, req);
1955 error:
1956 return err;
1957 }
1958 EXPORT_SYMBOL(p9_client_rename);
1959
1960 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1961 struct p9_fid *newdirfid, const char *new_name)
1962 {
1963 int err;
1964 struct p9_req_t *req;
1965 struct p9_client *clnt;
1966
1967 err = 0;
1968 clnt = olddirfid->clnt;
1969
1970 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1971 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1972 newdirfid->fid, new_name);
1973
1974 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1975 old_name, newdirfid->fid, new_name);
1976 if (IS_ERR(req)) {
1977 err = PTR_ERR(req);
1978 goto error;
1979 }
1980
1981 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1982 newdirfid->fid, new_name);
1983
1984 p9_free_req(clnt, req);
1985 error:
1986 return err;
1987 }
1988 EXPORT_SYMBOL(p9_client_renameat);
1989
1990 /*
1991 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1992 */
1993 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1994 const char *attr_name, u64 *attr_size)
1995 {
1996 int err;
1997 struct p9_req_t *req;
1998 struct p9_client *clnt;
1999 struct p9_fid *attr_fid;
2000
2001 err = 0;
2002 clnt = file_fid->clnt;
2003 attr_fid = p9_fid_create(clnt);
2004 if (!attr_fid) {
2005 err = -ENOMEM;
2006 goto error;
2007 }
2008 p9_debug(P9_DEBUG_9P,
2009 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
2010 file_fid->fid, attr_fid->fid, attr_name);
2011
2012 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
2013 file_fid->fid, attr_fid->fid, attr_name);
2014 if (IS_ERR(req)) {
2015 err = PTR_ERR(req);
2016 goto error;
2017 }
2018 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
2019 if (err) {
2020 trace_9p_protocol_dump(clnt, req->rc);
2021 p9_free_req(clnt, req);
2022 goto clunk_fid;
2023 }
2024 p9_free_req(clnt, req);
2025 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2026 attr_fid->fid, *attr_size);
2027 return attr_fid;
2028 clunk_fid:
2029 p9_client_clunk(attr_fid);
2030 attr_fid = NULL;
2031 error:
2032 if (attr_fid && (attr_fid != file_fid))
2033 p9_fid_destroy(attr_fid);
2034
2035 return ERR_PTR(err);
2036 }
2037 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2038
2039 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2040 u64 attr_size, int flags)
2041 {
2042 int err;
2043 struct p9_req_t *req;
2044 struct p9_client *clnt;
2045
2046 p9_debug(P9_DEBUG_9P,
2047 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2048 fid->fid, name, (long long)attr_size, flags);
2049 err = 0;
2050 clnt = fid->clnt;
2051 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2052 fid->fid, name, attr_size, flags);
2053 if (IS_ERR(req)) {
2054 err = PTR_ERR(req);
2055 goto error;
2056 }
2057 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2058 p9_free_req(clnt, req);
2059 error:
2060 return err;
2061 }
2062 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2063
2064 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2065 {
2066 int err, rsize, non_zc = 0;
2067 struct p9_client *clnt;
2068 struct p9_req_t *req;
2069 char *dataptr;
2070 struct kvec kv = {.iov_base = data, .iov_len = count};
2071 struct iov_iter to;
2072
2073 iov_iter_kvec(&to, READ | ITER_KVEC, &kv, 1, count);
2074
2075 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2076 fid->fid, (unsigned long long) offset, count);
2077
2078 err = 0;
2079 clnt = fid->clnt;
2080
2081 rsize = fid->iounit;
2082 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2083 rsize = clnt->msize - P9_READDIRHDRSZ;
2084
2085 if (count < rsize)
2086 rsize = count;
2087
2088 /* Don't bother zerocopy for small IO (< 1024) */
2089 if (clnt->trans_mod->zc_request && rsize > 1024) {
2090 /*
2091 * response header len is 11
2092 * PDU Header(7) + IO Size (4)
2093 */
2094 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0,
2095 11, "dqd", fid->fid, offset, rsize);
2096 } else {
2097 non_zc = 1;
2098 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2099 offset, rsize);
2100 }
2101 if (IS_ERR(req)) {
2102 err = PTR_ERR(req);
2103 goto error;
2104 }
2105
2106 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2107 if (err) {
2108 trace_9p_protocol_dump(clnt, req->rc);
2109 goto free_and_error;
2110 }
2111 if (rsize < count) {
2112 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize);
2113 count = rsize;
2114 }
2115
2116 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2117
2118 if (non_zc)
2119 memmove(data, dataptr, count);
2120
2121 p9_free_req(clnt, req);
2122 return count;
2123
2124 free_and_error:
2125 p9_free_req(clnt, req);
2126 error:
2127 return err;
2128 }
2129 EXPORT_SYMBOL(p9_client_readdir);
2130
2131 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode,
2132 dev_t rdev, kgid_t gid, struct p9_qid *qid)
2133 {
2134 int err;
2135 struct p9_client *clnt;
2136 struct p9_req_t *req;
2137
2138 err = 0;
2139 clnt = fid->clnt;
2140 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2141 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2142 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2143 MAJOR(rdev), MINOR(rdev), gid);
2144 if (IS_ERR(req))
2145 return PTR_ERR(req);
2146
2147 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2148 if (err) {
2149 trace_9p_protocol_dump(clnt, req->rc);
2150 goto error;
2151 }
2152 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2153 (unsigned long long)qid->path, qid->version);
2154
2155 error:
2156 p9_free_req(clnt, req);
2157 return err;
2158
2159 }
2160 EXPORT_SYMBOL(p9_client_mknod_dotl);
2161
2162 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode,
2163 kgid_t gid, struct p9_qid *qid)
2164 {
2165 int err;
2166 struct p9_client *clnt;
2167 struct p9_req_t *req;
2168
2169 err = 0;
2170 clnt = fid->clnt;
2171 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2172 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2173 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
2174 gid);
2175 if (IS_ERR(req))
2176 return PTR_ERR(req);
2177
2178 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2179 if (err) {
2180 trace_9p_protocol_dump(clnt, req->rc);
2181 goto error;
2182 }
2183 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2184 (unsigned long long)qid->path, qid->version);
2185
2186 error:
2187 p9_free_req(clnt, req);
2188 return err;
2189
2190 }
2191 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2192
2193 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2194 {
2195 int err;
2196 struct p9_client *clnt;
2197 struct p9_req_t *req;
2198
2199 err = 0;
2200 clnt = fid->clnt;
2201 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2202 "start %lld length %lld proc_id %d client_id %s\n",
2203 fid->fid, flock->type, flock->flags, flock->start,
2204 flock->length, flock->proc_id, flock->client_id);
2205
2206 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2207 flock->flags, flock->start, flock->length,
2208 flock->proc_id, flock->client_id);
2209
2210 if (IS_ERR(req))
2211 return PTR_ERR(req);
2212
2213 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2214 if (err) {
2215 trace_9p_protocol_dump(clnt, req->rc);
2216 goto error;
2217 }
2218 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2219 error:
2220 p9_free_req(clnt, req);
2221 return err;
2222
2223 }
2224 EXPORT_SYMBOL(p9_client_lock_dotl);
2225
2226 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2227 {
2228 int err;
2229 struct p9_client *clnt;
2230 struct p9_req_t *req;
2231
2232 err = 0;
2233 clnt = fid->clnt;
2234 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2235 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2236 glock->start, glock->length, glock->proc_id, glock->client_id);
2237
2238 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2239 glock->start, glock->length, glock->proc_id, glock->client_id);
2240
2241 if (IS_ERR(req))
2242 return PTR_ERR(req);
2243
2244 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2245 &glock->start, &glock->length, &glock->proc_id,
2246 &glock->client_id);
2247 if (err) {
2248 trace_9p_protocol_dump(clnt, req->rc);
2249 goto error;
2250 }
2251 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2252 "proc_id %d client_id %s\n", glock->type, glock->start,
2253 glock->length, glock->proc_id, glock->client_id);
2254 error:
2255 p9_free_req(clnt, req);
2256 return err;
2257 }
2258 EXPORT_SYMBOL(p9_client_getlock_dotl);
2259
2260 int p9_client_readlink(struct p9_fid *fid, char **target)
2261 {
2262 int err;
2263 struct p9_client *clnt;
2264 struct p9_req_t *req;
2265
2266 err = 0;
2267 clnt = fid->clnt;
2268 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2269
2270 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2271 if (IS_ERR(req))
2272 return PTR_ERR(req);
2273
2274 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2275 if (err) {
2276 trace_9p_protocol_dump(clnt, req->rc);
2277 goto error;
2278 }
2279 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2280 error:
2281 p9_free_req(clnt, req);
2282 return err;
2283 }
2284 EXPORT_SYMBOL(p9_client_readlink);
(deprecated) Btrfs devel tree