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[mirror_ubuntu-bionic-kernel.git] / net / 9p / client.c
1 /*
2 * net/9p/clnt.c
3 *
4 * 9P Client
5 *
6 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to:
20 * Free Software Foundation
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02111-1301 USA
23 *
24 */
25
26 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
27
28 #include <linux/module.h>
29 #include <linux/errno.h>
30 #include <linux/fs.h>
31 #include <linux/poll.h>
32 #include <linux/idr.h>
33 #include <linux/mutex.h>
34 #include <linux/slab.h>
35 #include <linux/sched/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 if (option < 4096) {
185 p9_debug(P9_DEBUG_ERROR,
186 "msize should be at least 4k\n");
187 ret = -EINVAL;
188 continue;
189 }
190 clnt->msize = option;
191 break;
192 case Opt_trans:
193 s = match_strdup(&args[0]);
194 if (!s) {
195 ret = -ENOMEM;
196 p9_debug(P9_DEBUG_ERROR,
197 "problem allocating copy of trans arg\n");
198 goto free_and_return;
199 }
200 clnt->trans_mod = v9fs_get_trans_by_name(s);
201 if (clnt->trans_mod == NULL) {
202 pr_info("Could not find request transport: %s\n",
203 s);
204 ret = -EINVAL;
205 kfree(s);
206 goto free_and_return;
207 }
208 kfree(s);
209 break;
210 case Opt_legacy:
211 clnt->proto_version = p9_proto_legacy;
212 break;
213 case Opt_version:
214 s = match_strdup(&args[0]);
215 if (!s) {
216 ret = -ENOMEM;
217 p9_debug(P9_DEBUG_ERROR,
218 "problem allocating copy of version arg\n");
219 goto free_and_return;
220 }
221 ret = get_protocol_version(s);
222 if (ret == -EINVAL) {
223 kfree(s);
224 goto free_and_return;
225 }
226 kfree(s);
227 clnt->proto_version = ret;
228 break;
229 default:
230 continue;
231 }
232 }
233
234 free_and_return:
235 kfree(tmp_options);
236 return ret;
237 }
238
239 static struct p9_fcall *p9_fcall_alloc(int alloc_msize)
240 {
241 struct p9_fcall *fc;
242 fc = kmalloc(sizeof(struct p9_fcall) + alloc_msize, GFP_NOFS);
243 if (!fc)
244 return NULL;
245 fc->capacity = alloc_msize;
246 fc->sdata = (char *) fc + sizeof(struct p9_fcall);
247 return fc;
248 }
249
250 /**
251 * p9_tag_alloc - lookup/allocate a request by tag
252 * @c: client session to lookup tag within
253 * @tag: numeric id for transaction
254 *
255 * this is a simple array lookup, but will grow the
256 * request_slots as necessary to accommodate transaction
257 * ids which did not previously have a slot.
258 *
259 * this code relies on the client spinlock to manage locks, its
260 * possible we should switch to something else, but I'd rather
261 * stick with something low-overhead for the common case.
262 *
263 */
264
265 static struct p9_req_t *
266 p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
267 {
268 unsigned long flags;
269 int row, col;
270 struct p9_req_t *req;
271 int alloc_msize = min(c->msize, max_size);
272
273 /* This looks up the original request by tag so we know which
274 * buffer to read the data into */
275 tag++;
276
277 if (tag >= c->max_tag) {
278 spin_lock_irqsave(&c->lock, flags);
279 /* check again since original check was outside of lock */
280 while (tag >= c->max_tag) {
281 row = (tag / P9_ROW_MAXTAG);
282 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
283 sizeof(struct p9_req_t), GFP_ATOMIC);
284
285 if (!c->reqs[row]) {
286 pr_err("Couldn't grow tag array\n");
287 spin_unlock_irqrestore(&c->lock, flags);
288 return ERR_PTR(-ENOMEM);
289 }
290 for (col = 0; col < P9_ROW_MAXTAG; col++) {
291 c->reqs[row][col].status = REQ_STATUS_IDLE;
292 c->reqs[row][col].tc = NULL;
293 }
294 c->max_tag += P9_ROW_MAXTAG;
295 }
296 spin_unlock_irqrestore(&c->lock, flags);
297 }
298 row = tag / P9_ROW_MAXTAG;
299 col = tag % P9_ROW_MAXTAG;
300
301 req = &c->reqs[row][col];
302 if (!req->wq) {
303 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
304 if (!req->wq)
305 goto grow_failed;
306 init_waitqueue_head(req->wq);
307 }
308
309 if (!req->tc)
310 req->tc = p9_fcall_alloc(alloc_msize);
311 if (!req->rc)
312 req->rc = p9_fcall_alloc(alloc_msize);
313 if (!req->tc || !req->rc)
314 goto grow_failed;
315
316 p9pdu_reset(req->tc);
317 p9pdu_reset(req->rc);
318
319 req->tc->tag = tag-1;
320 req->status = REQ_STATUS_ALLOC;
321
322 return req;
323
324 grow_failed:
325 pr_err("Couldn't grow tag array\n");
326 kfree(req->tc);
327 kfree(req->rc);
328 kfree(req->wq);
329 req->tc = req->rc = NULL;
330 req->wq = NULL;
331 return ERR_PTR(-ENOMEM);
332 }
333
334 /**
335 * p9_tag_lookup - lookup a request by tag
336 * @c: client session to lookup tag within
337 * @tag: numeric id for transaction
338 *
339 */
340
341 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
342 {
343 int row, col;
344
345 /* This looks up the original request by tag so we know which
346 * buffer to read the data into */
347 tag++;
348
349 if(tag >= c->max_tag)
350 return NULL;
351
352 row = tag / P9_ROW_MAXTAG;
353 col = tag % P9_ROW_MAXTAG;
354
355 return &c->reqs[row][col];
356 }
357 EXPORT_SYMBOL(p9_tag_lookup);
358
359 /**
360 * p9_tag_init - setup tags structure and contents
361 * @c: v9fs client struct
362 *
363 * This initializes the tags structure for each client instance.
364 *
365 */
366
367 static int p9_tag_init(struct p9_client *c)
368 {
369 int err = 0;
370
371 c->tagpool = p9_idpool_create();
372 if (IS_ERR(c->tagpool)) {
373 err = PTR_ERR(c->tagpool);
374 goto error;
375 }
376 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
377 if (err < 0) {
378 p9_idpool_destroy(c->tagpool);
379 goto error;
380 }
381 c->max_tag = 0;
382 error:
383 return err;
384 }
385
386 /**
387 * p9_tag_cleanup - cleans up tags structure and reclaims resources
388 * @c: v9fs client struct
389 *
390 * This frees resources associated with the tags structure
391 *
392 */
393 static void p9_tag_cleanup(struct p9_client *c)
394 {
395 int row, col;
396
397 /* check to insure all requests are idle */
398 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
399 for (col = 0; col < P9_ROW_MAXTAG; col++) {
400 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
401 p9_debug(P9_DEBUG_MUX,
402 "Attempting to cleanup non-free tag %d,%d\n",
403 row, col);
404 /* TODO: delay execution of cleanup */
405 return;
406 }
407 }
408 }
409
410 if (c->tagpool) {
411 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
412 p9_idpool_destroy(c->tagpool);
413 }
414
415 /* free requests associated with tags */
416 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
417 for (col = 0; col < P9_ROW_MAXTAG; col++) {
418 kfree(c->reqs[row][col].wq);
419 kfree(c->reqs[row][col].tc);
420 kfree(c->reqs[row][col].rc);
421 }
422 kfree(c->reqs[row]);
423 }
424 c->max_tag = 0;
425 }
426
427 /**
428 * p9_free_req - free a request and clean-up as necessary
429 * c: client state
430 * r: request to release
431 *
432 */
433
434 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
435 {
436 int tag = r->tc->tag;
437 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
438
439 r->status = REQ_STATUS_IDLE;
440 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
441 p9_idpool_put(tag, c->tagpool);
442 }
443
444 /**
445 * p9_client_cb - call back from transport to client
446 * c: client state
447 * req: request received
448 *
449 */
450 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status)
451 {
452 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
453
454 /*
455 * This barrier is needed to make sure any change made to req before
456 * the other thread wakes up will indeed be seen by the waiting side.
457 */
458 smp_wmb();
459 req->status = status;
460
461 wake_up(req->wq);
462 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
463 }
464 EXPORT_SYMBOL(p9_client_cb);
465
466 /**
467 * p9_parse_header - parse header arguments out of a packet
468 * @pdu: packet to parse
469 * @size: size of packet
470 * @type: type of request
471 * @tag: tag of packet
472 * @rewind: set if we need to rewind offset afterwards
473 */
474
475 int
476 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
477 int rewind)
478 {
479 int8_t r_type;
480 int16_t r_tag;
481 int32_t r_size;
482 int offset = pdu->offset;
483 int err;
484
485 pdu->offset = 0;
486 if (pdu->size == 0)
487 pdu->size = 7;
488
489 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
490 if (err)
491 goto rewind_and_exit;
492
493 pdu->size = r_size;
494 pdu->id = r_type;
495 pdu->tag = r_tag;
496
497 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
498 pdu->size, pdu->id, pdu->tag);
499
500 if (type)
501 *type = r_type;
502 if (tag)
503 *tag = r_tag;
504 if (size)
505 *size = r_size;
506
507
508 rewind_and_exit:
509 if (rewind)
510 pdu->offset = offset;
511 return err;
512 }
513 EXPORT_SYMBOL(p9_parse_header);
514
515 /**
516 * p9_check_errors - check 9p packet for error return and process it
517 * @c: current client instance
518 * @req: request to parse and check for error conditions
519 *
520 * returns error code if one is discovered, otherwise returns 0
521 *
522 * this will have to be more complicated if we have multiple
523 * error packet types
524 */
525
526 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
527 {
528 int8_t type;
529 int err;
530 int ecode;
531
532 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
533 /*
534 * dump the response from server
535 * This should be after check errors which poplulate pdu_fcall.
536 */
537 trace_9p_protocol_dump(c, req->rc);
538 if (err) {
539 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
540 return err;
541 }
542 if (type != P9_RERROR && type != P9_RLERROR)
543 return 0;
544
545 if (!p9_is_proto_dotl(c)) {
546 char *ename;
547 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
548 &ename, &ecode);
549 if (err)
550 goto out_err;
551
552 if (p9_is_proto_dotu(c) && ecode < 512)
553 err = -ecode;
554
555 if (!err) {
556 err = p9_errstr2errno(ename, strlen(ename));
557
558 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
559 -ecode, ename);
560 }
561 kfree(ename);
562 } else {
563 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
564 err = -ecode;
565
566 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
567 }
568
569 return err;
570
571 out_err:
572 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
573
574 return err;
575 }
576
577 /**
578 * p9_check_zc_errors - check 9p packet for error return and process it
579 * @c: current client instance
580 * @req: request to parse and check for error conditions
581 * @in_hdrlen: Size of response protocol buffer.
582 *
583 * returns error code if one is discovered, otherwise returns 0
584 *
585 * this will have to be more complicated if we have multiple
586 * error packet types
587 */
588
589 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
590 struct iov_iter *uidata, int in_hdrlen)
591 {
592 int err;
593 int ecode;
594 int8_t type;
595 char *ename = NULL;
596
597 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
598 /*
599 * dump the response from server
600 * This should be after parse_header which poplulate pdu_fcall.
601 */
602 trace_9p_protocol_dump(c, req->rc);
603 if (err) {
604 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
605 return err;
606 }
607
608 if (type != P9_RERROR && type != P9_RLERROR)
609 return 0;
610
611 if (!p9_is_proto_dotl(c)) {
612 /* Error is reported in string format */
613 int len;
614 /* 7 = header size for RERROR; */
615 int inline_len = in_hdrlen - 7;
616
617 len = req->rc->size - req->rc->offset;
618 if (len > (P9_ZC_HDR_SZ - 7)) {
619 err = -EFAULT;
620 goto out_err;
621 }
622
623 ename = &req->rc->sdata[req->rc->offset];
624 if (len > inline_len) {
625 /* We have error in external buffer */
626 if (!copy_from_iter_full(ename + inline_len,
627 len - inline_len, uidata)) {
628 err = -EFAULT;
629 goto out_err;
630 }
631 }
632 ename = NULL;
633 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
634 &ename, &ecode);
635 if (err)
636 goto out_err;
637
638 if (p9_is_proto_dotu(c) && ecode < 512)
639 err = -ecode;
640
641 if (!err) {
642 err = p9_errstr2errno(ename, strlen(ename));
643
644 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
645 -ecode, ename);
646 }
647 kfree(ename);
648 } else {
649 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
650 err = -ecode;
651
652 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
653 }
654 return err;
655
656 out_err:
657 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
658 return err;
659 }
660
661 static struct p9_req_t *
662 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
663
664 /**
665 * p9_client_flush - flush (cancel) a request
666 * @c: client state
667 * @oldreq: request to cancel
668 *
669 * This sents a flush for a particular request and links
670 * the flush request to the original request. The current
671 * code only supports a single flush request although the protocol
672 * allows for multiple flush requests to be sent for a single request.
673 *
674 */
675
676 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
677 {
678 struct p9_req_t *req;
679 int16_t oldtag;
680 int err;
681
682 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
683 if (err)
684 return err;
685
686 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
687
688 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
689 if (IS_ERR(req))
690 return PTR_ERR(req);
691
692 /*
693 * if we haven't received a response for oldreq,
694 * remove it from the list
695 */
696 if (oldreq->status == REQ_STATUS_SENT)
697 if (c->trans_mod->cancelled)
698 c->trans_mod->cancelled(c, oldreq);
699
700 p9_free_req(c, req);
701 return 0;
702 }
703
704 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
705 int8_t type, int req_size,
706 const char *fmt, va_list ap)
707 {
708 int tag, err;
709 struct p9_req_t *req;
710
711 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
712
713 /* we allow for any status other than disconnected */
714 if (c->status == Disconnected)
715 return ERR_PTR(-EIO);
716
717 /* if status is begin_disconnected we allow only clunk request */
718 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
719 return ERR_PTR(-EIO);
720
721 tag = P9_NOTAG;
722 if (type != P9_TVERSION) {
723 tag = p9_idpool_get(c->tagpool);
724 if (tag < 0)
725 return ERR_PTR(-ENOMEM);
726 }
727
728 req = p9_tag_alloc(c, tag, req_size);
729 if (IS_ERR(req))
730 return req;
731
732 /* marshall the data */
733 p9pdu_prepare(req->tc, tag, type);
734 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
735 if (err)
736 goto reterr;
737 p9pdu_finalize(c, req->tc);
738 trace_9p_client_req(c, type, tag);
739 return req;
740 reterr:
741 p9_free_req(c, req);
742 return ERR_PTR(err);
743 }
744
745 /**
746 * p9_client_rpc - issue a request and wait for a response
747 * @c: client session
748 * @type: type of request
749 * @fmt: protocol format string (see protocol.c)
750 *
751 * Returns request structure (which client must free using p9_free_req)
752 */
753
754 static struct p9_req_t *
755 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
756 {
757 va_list ap;
758 int sigpending, err;
759 unsigned long flags;
760 struct p9_req_t *req;
761
762 va_start(ap, fmt);
763 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
764 va_end(ap);
765 if (IS_ERR(req))
766 return req;
767
768 if (signal_pending(current)) {
769 sigpending = 1;
770 clear_thread_flag(TIF_SIGPENDING);
771 } else
772 sigpending = 0;
773
774 err = c->trans_mod->request(c, req);
775 if (err < 0) {
776 if (err != -ERESTARTSYS && err != -EFAULT)
777 c->status = Disconnected;
778 goto reterr;
779 }
780 again:
781 /* Wait for the response */
782 err = wait_event_killable(*req->wq, req->status >= REQ_STATUS_RCVD);
783
784 /*
785 * Make sure our req is coherent with regard to updates in other
786 * threads - echoes to wmb() in the callback
787 */
788 smp_rmb();
789
790 if ((err == -ERESTARTSYS) && (c->status == Connected)
791 && (type == P9_TFLUSH)) {
792 sigpending = 1;
793 clear_thread_flag(TIF_SIGPENDING);
794 goto again;
795 }
796
797 if (req->status == REQ_STATUS_ERROR) {
798 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
799 err = req->t_err;
800 }
801 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
802 p9_debug(P9_DEBUG_MUX, "flushing\n");
803 sigpending = 1;
804 clear_thread_flag(TIF_SIGPENDING);
805
806 if (c->trans_mod->cancel(c, req))
807 p9_client_flush(c, req);
808
809 /* if we received the response anyway, don't signal error */
810 if (req->status == REQ_STATUS_RCVD)
811 err = 0;
812 }
813 if (sigpending) {
814 spin_lock_irqsave(&current->sighand->siglock, flags);
815 recalc_sigpending();
816 spin_unlock_irqrestore(&current->sighand->siglock, flags);
817 }
818 if (err < 0)
819 goto reterr;
820
821 err = p9_check_errors(c, req);
822 trace_9p_client_res(c, type, req->rc->tag, err);
823 if (!err)
824 return req;
825 reterr:
826 p9_free_req(c, req);
827 return ERR_PTR(safe_errno(err));
828 }
829
830 /**
831 * p9_client_zc_rpc - issue a request and wait for a response
832 * @c: client session
833 * @type: type of request
834 * @uidata: destination for zero copy read
835 * @uodata: source for zero copy write
836 * @inlen: read buffer size
837 * @olen: write buffer size
838 * @hdrlen: reader header size, This is the size of response protocol data
839 * @fmt: protocol format string (see protocol.c)
840 *
841 * Returns request structure (which client must free using p9_free_req)
842 */
843 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
844 struct iov_iter *uidata,
845 struct iov_iter *uodata,
846 int inlen, int olen, int in_hdrlen,
847 const char *fmt, ...)
848 {
849 va_list ap;
850 int sigpending, err;
851 unsigned long flags;
852 struct p9_req_t *req;
853
854 va_start(ap, fmt);
855 /*
856 * We allocate a inline protocol data of only 4k bytes.
857 * The actual content is passed in zero-copy fashion.
858 */
859 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
860 va_end(ap);
861 if (IS_ERR(req))
862 return req;
863
864 if (signal_pending(current)) {
865 sigpending = 1;
866 clear_thread_flag(TIF_SIGPENDING);
867 } else
868 sigpending = 0;
869
870 err = c->trans_mod->zc_request(c, req, uidata, uodata,
871 inlen, olen, in_hdrlen);
872 if (err < 0) {
873 if (err == -EIO)
874 c->status = Disconnected;
875 if (err != -ERESTARTSYS)
876 goto reterr;
877 }
878 if (req->status == REQ_STATUS_ERROR) {
879 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
880 err = req->t_err;
881 }
882 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
883 p9_debug(P9_DEBUG_MUX, "flushing\n");
884 sigpending = 1;
885 clear_thread_flag(TIF_SIGPENDING);
886
887 if (c->trans_mod->cancel(c, req))
888 p9_client_flush(c, req);
889
890 /* if we received the response anyway, don't signal error */
891 if (req->status == REQ_STATUS_RCVD)
892 err = 0;
893 }
894 if (sigpending) {
895 spin_lock_irqsave(&current->sighand->siglock, flags);
896 recalc_sigpending();
897 spin_unlock_irqrestore(&current->sighand->siglock, flags);
898 }
899 if (err < 0)
900 goto reterr;
901
902 err = p9_check_zc_errors(c, req, uidata, in_hdrlen);
903 trace_9p_client_res(c, type, req->rc->tag, err);
904 if (!err)
905 return req;
906 reterr:
907 p9_free_req(c, req);
908 return ERR_PTR(safe_errno(err));
909 }
910
911 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
912 {
913 int ret;
914 struct p9_fid *fid;
915 unsigned long flags;
916
917 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
918 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
919 if (!fid)
920 return ERR_PTR(-ENOMEM);
921
922 ret = p9_idpool_get(clnt->fidpool);
923 if (ret < 0) {
924 ret = -ENOSPC;
925 goto error;
926 }
927 fid->fid = ret;
928
929 memset(&fid->qid, 0, sizeof(struct p9_qid));
930 fid->mode = -1;
931 fid->uid = current_fsuid();
932 fid->clnt = clnt;
933 fid->rdir = NULL;
934 spin_lock_irqsave(&clnt->lock, flags);
935 list_add(&fid->flist, &clnt->fidlist);
936 spin_unlock_irqrestore(&clnt->lock, flags);
937
938 return fid;
939
940 error:
941 kfree(fid);
942 return ERR_PTR(ret);
943 }
944
945 static void p9_fid_destroy(struct p9_fid *fid)
946 {
947 struct p9_client *clnt;
948 unsigned long flags;
949
950 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
951 clnt = fid->clnt;
952 p9_idpool_put(fid->fid, clnt->fidpool);
953 spin_lock_irqsave(&clnt->lock, flags);
954 list_del(&fid->flist);
955 spin_unlock_irqrestore(&clnt->lock, flags);
956 kfree(fid->rdir);
957 kfree(fid);
958 }
959
960 static int p9_client_version(struct p9_client *c)
961 {
962 int err = 0;
963 struct p9_req_t *req;
964 char *version = NULL;
965 int msize;
966
967 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
968 c->msize, c->proto_version);
969
970 switch (c->proto_version) {
971 case p9_proto_2000L:
972 req = p9_client_rpc(c, P9_TVERSION, "ds",
973 c->msize, "9P2000.L");
974 break;
975 case p9_proto_2000u:
976 req = p9_client_rpc(c, P9_TVERSION, "ds",
977 c->msize, "9P2000.u");
978 break;
979 case p9_proto_legacy:
980 req = p9_client_rpc(c, P9_TVERSION, "ds",
981 c->msize, "9P2000");
982 break;
983 default:
984 return -EINVAL;
985 }
986
987 if (IS_ERR(req))
988 return PTR_ERR(req);
989
990 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
991 if (err) {
992 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
993 trace_9p_protocol_dump(c, req->rc);
994 goto error;
995 }
996
997 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
998 if (!strncmp(version, "9P2000.L", 8))
999 c->proto_version = p9_proto_2000L;
1000 else if (!strncmp(version, "9P2000.u", 8))
1001 c->proto_version = p9_proto_2000u;
1002 else if (!strncmp(version, "9P2000", 6))
1003 c->proto_version = p9_proto_legacy;
1004 else {
1005 p9_debug(P9_DEBUG_ERROR,
1006 "server returned an unknown version: %s\n", version);
1007 err = -EREMOTEIO;
1008 goto error;
1009 }
1010
1011 if (msize < 4096) {
1012 p9_debug(P9_DEBUG_ERROR,
1013 "server returned a msize < 4096: %d\n", msize);
1014 err = -EREMOTEIO;
1015 goto error;
1016 }
1017 if (msize < c->msize)
1018 c->msize = msize;
1019
1020 error:
1021 kfree(version);
1022 p9_free_req(c, req);
1023
1024 return err;
1025 }
1026
1027 struct p9_client *p9_client_create(const char *dev_name, char *options)
1028 {
1029 int err;
1030 struct p9_client *clnt;
1031 char *client_id;
1032
1033 err = 0;
1034 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
1035 if (!clnt)
1036 return ERR_PTR(-ENOMEM);
1037
1038 clnt->trans_mod = NULL;
1039 clnt->trans = NULL;
1040
1041 client_id = utsname()->nodename;
1042 memcpy(clnt->name, client_id, strlen(client_id) + 1);
1043
1044 spin_lock_init(&clnt->lock);
1045 INIT_LIST_HEAD(&clnt->fidlist);
1046
1047 err = p9_tag_init(clnt);
1048 if (err < 0)
1049 goto free_client;
1050
1051 err = parse_opts(options, clnt);
1052 if (err < 0)
1053 goto destroy_tagpool;
1054
1055 if (!clnt->trans_mod)
1056 clnt->trans_mod = v9fs_get_default_trans();
1057
1058 if (clnt->trans_mod == NULL) {
1059 err = -EPROTONOSUPPORT;
1060 p9_debug(P9_DEBUG_ERROR,
1061 "No transport defined or default transport\n");
1062 goto destroy_tagpool;
1063 }
1064
1065 clnt->fidpool = p9_idpool_create();
1066 if (IS_ERR(clnt->fidpool)) {
1067 err = PTR_ERR(clnt->fidpool);
1068 goto put_trans;
1069 }
1070
1071 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1072 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1073
1074 err = clnt->trans_mod->create(clnt, dev_name, options);
1075 if (err)
1076 goto destroy_fidpool;
1077
1078 if (clnt->msize > clnt->trans_mod->maxsize)
1079 clnt->msize = clnt->trans_mod->maxsize;
1080
1081 if (clnt->msize < 4096) {
1082 p9_debug(P9_DEBUG_ERROR,
1083 "Please specify a msize of at least 4k\n");
1084 err = -EINVAL;
1085 goto close_trans;
1086 }
1087
1088 err = p9_client_version(clnt);
1089 if (err)
1090 goto close_trans;
1091
1092 return clnt;
1093
1094 close_trans:
1095 clnt->trans_mod->close(clnt);
1096 destroy_fidpool:
1097 p9_idpool_destroy(clnt->fidpool);
1098 put_trans:
1099 v9fs_put_trans(clnt->trans_mod);
1100 destroy_tagpool:
1101 p9_idpool_destroy(clnt->tagpool);
1102 free_client:
1103 kfree(clnt);
1104 return ERR_PTR(err);
1105 }
1106 EXPORT_SYMBOL(p9_client_create);
1107
1108 void p9_client_destroy(struct p9_client *clnt)
1109 {
1110 struct p9_fid *fid, *fidptr;
1111
1112 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1113
1114 if (clnt->trans_mod)
1115 clnt->trans_mod->close(clnt);
1116
1117 v9fs_put_trans(clnt->trans_mod);
1118
1119 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
1120 pr_info("Found fid %d not clunked\n", fid->fid);
1121 p9_fid_destroy(fid);
1122 }
1123
1124 if (clnt->fidpool)
1125 p9_idpool_destroy(clnt->fidpool);
1126
1127 p9_tag_cleanup(clnt);
1128
1129 kfree(clnt);
1130 }
1131 EXPORT_SYMBOL(p9_client_destroy);
1132
1133 void p9_client_disconnect(struct p9_client *clnt)
1134 {
1135 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1136 clnt->status = Disconnected;
1137 }
1138 EXPORT_SYMBOL(p9_client_disconnect);
1139
1140 void p9_client_begin_disconnect(struct p9_client *clnt)
1141 {
1142 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1143 clnt->status = BeginDisconnect;
1144 }
1145 EXPORT_SYMBOL(p9_client_begin_disconnect);
1146
1147 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1148 const char *uname, kuid_t n_uname, const char *aname)
1149 {
1150 int err = 0;
1151 struct p9_req_t *req;
1152 struct p9_fid *fid;
1153 struct p9_qid qid;
1154
1155
1156 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1157 afid ? afid->fid : -1, uname, aname);
1158 fid = p9_fid_create(clnt);
1159 if (IS_ERR(fid)) {
1160 err = PTR_ERR(fid);
1161 fid = NULL;
1162 goto error;
1163 }
1164 fid->uid = n_uname;
1165
1166 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1167 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1168 if (IS_ERR(req)) {
1169 err = PTR_ERR(req);
1170 goto error;
1171 }
1172
1173 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
1174 if (err) {
1175 trace_9p_protocol_dump(clnt, req->rc);
1176 p9_free_req(clnt, req);
1177 goto error;
1178 }
1179
1180 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1181 qid.type, (unsigned long long)qid.path, qid.version);
1182
1183 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1184
1185 p9_free_req(clnt, req);
1186 return fid;
1187
1188 error:
1189 if (fid)
1190 p9_fid_destroy(fid);
1191 return ERR_PTR(err);
1192 }
1193 EXPORT_SYMBOL(p9_client_attach);
1194
1195 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1196 const unsigned char * const *wnames, int clone)
1197 {
1198 int err;
1199 struct p9_client *clnt;
1200 struct p9_fid *fid;
1201 struct p9_qid *wqids;
1202 struct p9_req_t *req;
1203 uint16_t nwqids, count;
1204
1205 err = 0;
1206 wqids = NULL;
1207 clnt = oldfid->clnt;
1208 if (clone) {
1209 fid = p9_fid_create(clnt);
1210 if (IS_ERR(fid)) {
1211 err = PTR_ERR(fid);
1212 fid = NULL;
1213 goto error;
1214 }
1215
1216 fid->uid = oldfid->uid;
1217 } else
1218 fid = oldfid;
1219
1220
1221 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1222 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1223
1224 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1225 nwname, wnames);
1226 if (IS_ERR(req)) {
1227 err = PTR_ERR(req);
1228 goto error;
1229 }
1230
1231 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1232 if (err) {
1233 trace_9p_protocol_dump(clnt, req->rc);
1234 p9_free_req(clnt, req);
1235 goto clunk_fid;
1236 }
1237 p9_free_req(clnt, req);
1238
1239 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1240
1241 if (nwqids != nwname) {
1242 err = -ENOENT;
1243 goto clunk_fid;
1244 }
1245
1246 for (count = 0; count < nwqids; count++)
1247 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1248 count, wqids[count].type,
1249 (unsigned long long)wqids[count].path,
1250 wqids[count].version);
1251
1252 if (nwname)
1253 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1254 else
1255 fid->qid = oldfid->qid;
1256
1257 kfree(wqids);
1258 return fid;
1259
1260 clunk_fid:
1261 kfree(wqids);
1262 p9_client_clunk(fid);
1263 fid = NULL;
1264
1265 error:
1266 if (fid && (fid != oldfid))
1267 p9_fid_destroy(fid);
1268
1269 return ERR_PTR(err);
1270 }
1271 EXPORT_SYMBOL(p9_client_walk);
1272
1273 int p9_client_open(struct p9_fid *fid, int mode)
1274 {
1275 int err;
1276 struct p9_client *clnt;
1277 struct p9_req_t *req;
1278 struct p9_qid qid;
1279 int iounit;
1280
1281 clnt = fid->clnt;
1282 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1283 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1284 err = 0;
1285
1286 if (fid->mode != -1)
1287 return -EINVAL;
1288
1289 if (p9_is_proto_dotl(clnt))
1290 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1291 else
1292 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1293 if (IS_ERR(req)) {
1294 err = PTR_ERR(req);
1295 goto error;
1296 }
1297
1298 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1299 if (err) {
1300 trace_9p_protocol_dump(clnt, req->rc);
1301 goto free_and_error;
1302 }
1303
1304 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1305 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1306 (unsigned long long)qid.path, qid.version, iounit);
1307
1308 fid->mode = mode;
1309 fid->iounit = iounit;
1310
1311 free_and_error:
1312 p9_free_req(clnt, req);
1313 error:
1314 return err;
1315 }
1316 EXPORT_SYMBOL(p9_client_open);
1317
1318 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode,
1319 kgid_t gid, struct p9_qid *qid)
1320 {
1321 int err = 0;
1322 struct p9_client *clnt;
1323 struct p9_req_t *req;
1324 int iounit;
1325
1326 p9_debug(P9_DEBUG_9P,
1327 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1328 ofid->fid, name, flags, mode,
1329 from_kgid(&init_user_ns, gid));
1330 clnt = ofid->clnt;
1331
1332 if (ofid->mode != -1)
1333 return -EINVAL;
1334
1335 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1336 mode, gid);
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, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1349 qid->type,
1350 (unsigned long long)qid->path,
1351 qid->version, iounit);
1352
1353 ofid->mode = mode;
1354 ofid->iounit = iounit;
1355
1356 free_and_error:
1357 p9_free_req(clnt, req);
1358 error:
1359 return err;
1360 }
1361 EXPORT_SYMBOL(p9_client_create_dotl);
1362
1363 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode,
1364 char *extension)
1365 {
1366 int err;
1367 struct p9_client *clnt;
1368 struct p9_req_t *req;
1369 struct p9_qid qid;
1370 int iounit;
1371
1372 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1373 fid->fid, name, perm, mode);
1374 err = 0;
1375 clnt = fid->clnt;
1376
1377 if (fid->mode != -1)
1378 return -EINVAL;
1379
1380 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1381 mode, extension);
1382 if (IS_ERR(req)) {
1383 err = PTR_ERR(req);
1384 goto error;
1385 }
1386
1387 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1388 if (err) {
1389 trace_9p_protocol_dump(clnt, req->rc);
1390 goto free_and_error;
1391 }
1392
1393 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1394 qid.type,
1395 (unsigned long long)qid.path,
1396 qid.version, iounit);
1397
1398 fid->mode = mode;
1399 fid->iounit = iounit;
1400
1401 free_and_error:
1402 p9_free_req(clnt, req);
1403 error:
1404 return err;
1405 }
1406 EXPORT_SYMBOL(p9_client_fcreate);
1407
1408 int p9_client_symlink(struct p9_fid *dfid, const char *name,
1409 const char *symtgt, kgid_t gid, struct p9_qid *qid)
1410 {
1411 int err = 0;
1412 struct p9_client *clnt;
1413 struct p9_req_t *req;
1414
1415 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1416 dfid->fid, name, symtgt);
1417 clnt = dfid->clnt;
1418
1419 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1420 gid);
1421 if (IS_ERR(req)) {
1422 err = PTR_ERR(req);
1423 goto error;
1424 }
1425
1426 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1427 if (err) {
1428 trace_9p_protocol_dump(clnt, req->rc);
1429 goto free_and_error;
1430 }
1431
1432 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1433 qid->type, (unsigned long long)qid->path, qid->version);
1434
1435 free_and_error:
1436 p9_free_req(clnt, req);
1437 error:
1438 return err;
1439 }
1440 EXPORT_SYMBOL(p9_client_symlink);
1441
1442 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname)
1443 {
1444 struct p9_client *clnt;
1445 struct p9_req_t *req;
1446
1447 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1448 dfid->fid, oldfid->fid, newname);
1449 clnt = dfid->clnt;
1450 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1451 newname);
1452 if (IS_ERR(req))
1453 return PTR_ERR(req);
1454
1455 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1456 p9_free_req(clnt, req);
1457 return 0;
1458 }
1459 EXPORT_SYMBOL(p9_client_link);
1460
1461 int p9_client_fsync(struct p9_fid *fid, int datasync)
1462 {
1463 int err;
1464 struct p9_client *clnt;
1465 struct p9_req_t *req;
1466
1467 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1468 fid->fid, datasync);
1469 err = 0;
1470 clnt = fid->clnt;
1471
1472 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1473 if (IS_ERR(req)) {
1474 err = PTR_ERR(req);
1475 goto error;
1476 }
1477
1478 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1479
1480 p9_free_req(clnt, req);
1481
1482 error:
1483 return err;
1484 }
1485 EXPORT_SYMBOL(p9_client_fsync);
1486
1487 int p9_client_clunk(struct p9_fid *fid)
1488 {
1489 int err;
1490 struct p9_client *clnt;
1491 struct p9_req_t *req;
1492 int retries = 0;
1493
1494 if (!fid) {
1495 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1496 __func__, task_pid_nr(current));
1497 dump_stack();
1498 return 0;
1499 }
1500
1501 again:
1502 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1503 retries);
1504 err = 0;
1505 clnt = fid->clnt;
1506
1507 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1508 if (IS_ERR(req)) {
1509 err = PTR_ERR(req);
1510 goto error;
1511 }
1512
1513 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1514
1515 p9_free_req(clnt, req);
1516 error:
1517 /*
1518 * Fid is not valid even after a failed clunk
1519 * If interrupted, retry once then give up and
1520 * leak fid until umount.
1521 */
1522 if (err == -ERESTARTSYS) {
1523 if (retries++ == 0)
1524 goto again;
1525 } else
1526 p9_fid_destroy(fid);
1527 return err;
1528 }
1529 EXPORT_SYMBOL(p9_client_clunk);
1530
1531 int p9_client_remove(struct p9_fid *fid)
1532 {
1533 int err;
1534 struct p9_client *clnt;
1535 struct p9_req_t *req;
1536
1537 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1538 err = 0;
1539 clnt = fid->clnt;
1540
1541 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1542 if (IS_ERR(req)) {
1543 err = PTR_ERR(req);
1544 goto error;
1545 }
1546
1547 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1548
1549 p9_free_req(clnt, req);
1550 error:
1551 if (err == -ERESTARTSYS)
1552 p9_client_clunk(fid);
1553 else
1554 p9_fid_destroy(fid);
1555 return err;
1556 }
1557 EXPORT_SYMBOL(p9_client_remove);
1558
1559 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1560 {
1561 int err = 0;
1562 struct p9_req_t *req;
1563 struct p9_client *clnt;
1564
1565 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1566 dfid->fid, name, flags);
1567
1568 clnt = dfid->clnt;
1569 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1570 if (IS_ERR(req)) {
1571 err = PTR_ERR(req);
1572 goto error;
1573 }
1574 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1575
1576 p9_free_req(clnt, req);
1577 error:
1578 return err;
1579 }
1580 EXPORT_SYMBOL(p9_client_unlinkat);
1581
1582 int
1583 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
1584 {
1585 struct p9_client *clnt = fid->clnt;
1586 struct p9_req_t *req;
1587 int total = 0;
1588 *err = 0;
1589
1590 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1591 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to));
1592
1593 while (iov_iter_count(to)) {
1594 int count = iov_iter_count(to);
1595 int rsize, non_zc = 0;
1596 char *dataptr;
1597
1598 rsize = fid->iounit;
1599 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1600 rsize = clnt->msize - P9_IOHDRSZ;
1601
1602 if (count < rsize)
1603 rsize = count;
1604
1605 /* Don't bother zerocopy for small IO (< 1024) */
1606 if (clnt->trans_mod->zc_request && rsize > 1024) {
1607 /*
1608 * response header len is 11
1609 * PDU Header(7) + IO Size (4)
1610 */
1611 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize,
1612 0, 11, "dqd", fid->fid,
1613 offset, rsize);
1614 } else {
1615 non_zc = 1;
1616 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1617 rsize);
1618 }
1619 if (IS_ERR(req)) {
1620 *err = PTR_ERR(req);
1621 break;
1622 }
1623
1624 *err = p9pdu_readf(req->rc, clnt->proto_version,
1625 "D", &count, &dataptr);
1626 if (*err) {
1627 trace_9p_protocol_dump(clnt, req->rc);
1628 p9_free_req(clnt, req);
1629 break;
1630 }
1631 if (rsize < count) {
1632 pr_err("bogus RREAD count (%d > %d)\n", count, rsize);
1633 count = rsize;
1634 }
1635
1636 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1637 if (!count) {
1638 p9_free_req(clnt, req);
1639 break;
1640 }
1641
1642 if (non_zc) {
1643 int n = copy_to_iter(dataptr, count, to);
1644 total += n;
1645 offset += n;
1646 if (n != count) {
1647 *err = -EFAULT;
1648 p9_free_req(clnt, req);
1649 break;
1650 }
1651 } else {
1652 iov_iter_advance(to, count);
1653 total += count;
1654 offset += count;
1655 }
1656 p9_free_req(clnt, req);
1657 }
1658 return total;
1659 }
1660 EXPORT_SYMBOL(p9_client_read);
1661
1662 int
1663 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
1664 {
1665 struct p9_client *clnt = fid->clnt;
1666 struct p9_req_t *req;
1667 int total = 0;
1668 *err = 0;
1669
1670 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n",
1671 fid->fid, (unsigned long long) offset,
1672 iov_iter_count(from));
1673
1674 while (iov_iter_count(from)) {
1675 int count = iov_iter_count(from);
1676 int rsize = fid->iounit;
1677 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1678 rsize = clnt->msize - P9_IOHDRSZ;
1679
1680 if (count < rsize)
1681 rsize = count;
1682
1683 /* Don't bother zerocopy for small IO (< 1024) */
1684 if (clnt->trans_mod->zc_request && rsize > 1024) {
1685 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0,
1686 rsize, P9_ZC_HDR_SZ, "dqd",
1687 fid->fid, offset, rsize);
1688 } else {
1689 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
1690 offset, rsize, from);
1691 }
1692 if (IS_ERR(req)) {
1693 *err = PTR_ERR(req);
1694 break;
1695 }
1696
1697 *err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1698 if (*err) {
1699 trace_9p_protocol_dump(clnt, req->rc);
1700 p9_free_req(clnt, req);
1701 break;
1702 }
1703 if (rsize < count) {
1704 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize);
1705 count = rsize;
1706 }
1707
1708 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1709
1710 p9_free_req(clnt, req);
1711 iov_iter_advance(from, count);
1712 total += count;
1713 offset += count;
1714 }
1715 return total;
1716 }
1717 EXPORT_SYMBOL(p9_client_write);
1718
1719 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1720 {
1721 int err;
1722 struct p9_client *clnt;
1723 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1724 struct p9_req_t *req;
1725 u16 ignored;
1726
1727 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1728
1729 if (!ret)
1730 return ERR_PTR(-ENOMEM);
1731
1732 err = 0;
1733 clnt = fid->clnt;
1734
1735 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1736 if (IS_ERR(req)) {
1737 err = PTR_ERR(req);
1738 goto error;
1739 }
1740
1741 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1742 if (err) {
1743 trace_9p_protocol_dump(clnt, req->rc);
1744 p9_free_req(clnt, req);
1745 goto error;
1746 }
1747
1748 p9_debug(P9_DEBUG_9P,
1749 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1750 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1751 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1752 "<<< uid=%d gid=%d n_muid=%d\n",
1753 ret->size, ret->type, ret->dev, ret->qid.type,
1754 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1755 ret->atime, ret->mtime, (unsigned long long)ret->length,
1756 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1757 from_kuid(&init_user_ns, ret->n_uid),
1758 from_kgid(&init_user_ns, ret->n_gid),
1759 from_kuid(&init_user_ns, ret->n_muid));
1760
1761 p9_free_req(clnt, req);
1762 return ret;
1763
1764 error:
1765 kfree(ret);
1766 return ERR_PTR(err);
1767 }
1768 EXPORT_SYMBOL(p9_client_stat);
1769
1770 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1771 u64 request_mask)
1772 {
1773 int err;
1774 struct p9_client *clnt;
1775 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1776 GFP_KERNEL);
1777 struct p9_req_t *req;
1778
1779 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1780 fid->fid, request_mask);
1781
1782 if (!ret)
1783 return ERR_PTR(-ENOMEM);
1784
1785 err = 0;
1786 clnt = fid->clnt;
1787
1788 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1789 if (IS_ERR(req)) {
1790 err = PTR_ERR(req);
1791 goto error;
1792 }
1793
1794 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1795 if (err) {
1796 trace_9p_protocol_dump(clnt, req->rc);
1797 p9_free_req(clnt, req);
1798 goto error;
1799 }
1800
1801 p9_debug(P9_DEBUG_9P,
1802 "<<< RGETATTR st_result_mask=%lld\n"
1803 "<<< qid=%x.%llx.%x\n"
1804 "<<< st_mode=%8.8x st_nlink=%llu\n"
1805 "<<< st_uid=%d st_gid=%d\n"
1806 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1807 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1808 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1809 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1810 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1811 "<<< st_gen=%lld st_data_version=%lld",
1812 ret->st_result_mask, ret->qid.type, ret->qid.path,
1813 ret->qid.version, ret->st_mode, ret->st_nlink,
1814 from_kuid(&init_user_ns, ret->st_uid),
1815 from_kgid(&init_user_ns, ret->st_gid),
1816 ret->st_rdev, ret->st_size, ret->st_blksize,
1817 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1818 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1819 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1820 ret->st_gen, ret->st_data_version);
1821
1822 p9_free_req(clnt, req);
1823 return ret;
1824
1825 error:
1826 kfree(ret);
1827 return ERR_PTR(err);
1828 }
1829 EXPORT_SYMBOL(p9_client_getattr_dotl);
1830
1831 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1832 {
1833 int ret;
1834
1835 /* NOTE: size shouldn't include its own length */
1836 /* size[2] type[2] dev[4] qid[13] */
1837 /* mode[4] atime[4] mtime[4] length[8]*/
1838 /* name[s] uid[s] gid[s] muid[s] */
1839 ret = 2+4+13+4+4+4+8+2+2+2+2;
1840
1841 if (wst->name)
1842 ret += strlen(wst->name);
1843 if (wst->uid)
1844 ret += strlen(wst->uid);
1845 if (wst->gid)
1846 ret += strlen(wst->gid);
1847 if (wst->muid)
1848 ret += strlen(wst->muid);
1849
1850 if ((proto_version == p9_proto_2000u) ||
1851 (proto_version == p9_proto_2000L)) {
1852 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1853 if (wst->extension)
1854 ret += strlen(wst->extension);
1855 }
1856
1857 return ret;
1858 }
1859
1860 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1861 {
1862 int err;
1863 struct p9_req_t *req;
1864 struct p9_client *clnt;
1865
1866 err = 0;
1867 clnt = fid->clnt;
1868 wst->size = p9_client_statsize(wst, clnt->proto_version);
1869 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1870 p9_debug(P9_DEBUG_9P,
1871 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1872 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1873 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1874 " uid=%d gid=%d n_muid=%d\n",
1875 wst->size, wst->type, wst->dev, wst->qid.type,
1876 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1877 wst->atime, wst->mtime, (unsigned long long)wst->length,
1878 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1879 from_kuid(&init_user_ns, wst->n_uid),
1880 from_kgid(&init_user_ns, wst->n_gid),
1881 from_kuid(&init_user_ns, wst->n_muid));
1882
1883 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1884 if (IS_ERR(req)) {
1885 err = PTR_ERR(req);
1886 goto error;
1887 }
1888
1889 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1890
1891 p9_free_req(clnt, req);
1892 error:
1893 return err;
1894 }
1895 EXPORT_SYMBOL(p9_client_wstat);
1896
1897 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1898 {
1899 int err;
1900 struct p9_req_t *req;
1901 struct p9_client *clnt;
1902
1903 err = 0;
1904 clnt = fid->clnt;
1905 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1906 p9_debug(P9_DEBUG_9P,
1907 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1908 " atime_sec=%lld atime_nsec=%lld\n"
1909 " mtime_sec=%lld mtime_nsec=%lld\n",
1910 p9attr->valid, p9attr->mode,
1911 from_kuid(&init_user_ns, p9attr->uid),
1912 from_kgid(&init_user_ns, p9attr->gid),
1913 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1914 p9attr->mtime_sec, p9attr->mtime_nsec);
1915
1916 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1917
1918 if (IS_ERR(req)) {
1919 err = PTR_ERR(req);
1920 goto error;
1921 }
1922 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1923 p9_free_req(clnt, req);
1924 error:
1925 return err;
1926 }
1927 EXPORT_SYMBOL(p9_client_setattr);
1928
1929 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1930 {
1931 int err;
1932 struct p9_req_t *req;
1933 struct p9_client *clnt;
1934
1935 err = 0;
1936 clnt = fid->clnt;
1937
1938 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1939
1940 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1941 if (IS_ERR(req)) {
1942 err = PTR_ERR(req);
1943 goto error;
1944 }
1945
1946 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1947 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1948 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1949 if (err) {
1950 trace_9p_protocol_dump(clnt, req->rc);
1951 p9_free_req(clnt, req);
1952 goto error;
1953 }
1954
1955 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1956 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1957 "fsid %llu namelen %ld\n",
1958 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1959 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1960 sb->fsid, (long int)sb->namelen);
1961
1962 p9_free_req(clnt, req);
1963 error:
1964 return err;
1965 }
1966 EXPORT_SYMBOL(p9_client_statfs);
1967
1968 int p9_client_rename(struct p9_fid *fid,
1969 struct p9_fid *newdirfid, const char *name)
1970 {
1971 int err;
1972 struct p9_req_t *req;
1973 struct p9_client *clnt;
1974
1975 err = 0;
1976 clnt = fid->clnt;
1977
1978 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1979 fid->fid, newdirfid->fid, name);
1980
1981 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1982 newdirfid->fid, name);
1983 if (IS_ERR(req)) {
1984 err = PTR_ERR(req);
1985 goto error;
1986 }
1987
1988 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1989
1990 p9_free_req(clnt, req);
1991 error:
1992 return err;
1993 }
1994 EXPORT_SYMBOL(p9_client_rename);
1995
1996 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1997 struct p9_fid *newdirfid, const char *new_name)
1998 {
1999 int err;
2000 struct p9_req_t *req;
2001 struct p9_client *clnt;
2002
2003 err = 0;
2004 clnt = olddirfid->clnt;
2005
2006 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
2007 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
2008 newdirfid->fid, new_name);
2009
2010 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
2011 old_name, newdirfid->fid, new_name);
2012 if (IS_ERR(req)) {
2013 err = PTR_ERR(req);
2014 goto error;
2015 }
2016
2017 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
2018 newdirfid->fid, new_name);
2019
2020 p9_free_req(clnt, req);
2021 error:
2022 return err;
2023 }
2024 EXPORT_SYMBOL(p9_client_renameat);
2025
2026 /*
2027 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
2028 */
2029 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
2030 const char *attr_name, u64 *attr_size)
2031 {
2032 int err;
2033 struct p9_req_t *req;
2034 struct p9_client *clnt;
2035 struct p9_fid *attr_fid;
2036
2037 err = 0;
2038 clnt = file_fid->clnt;
2039 attr_fid = p9_fid_create(clnt);
2040 if (IS_ERR(attr_fid)) {
2041 err = PTR_ERR(attr_fid);
2042 attr_fid = NULL;
2043 goto error;
2044 }
2045 p9_debug(P9_DEBUG_9P,
2046 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
2047 file_fid->fid, attr_fid->fid, attr_name);
2048
2049 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
2050 file_fid->fid, attr_fid->fid, attr_name);
2051 if (IS_ERR(req)) {
2052 err = PTR_ERR(req);
2053 goto error;
2054 }
2055 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
2056 if (err) {
2057 trace_9p_protocol_dump(clnt, req->rc);
2058 p9_free_req(clnt, req);
2059 goto clunk_fid;
2060 }
2061 p9_free_req(clnt, req);
2062 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2063 attr_fid->fid, *attr_size);
2064 return attr_fid;
2065 clunk_fid:
2066 p9_client_clunk(attr_fid);
2067 attr_fid = NULL;
2068 error:
2069 if (attr_fid && (attr_fid != file_fid))
2070 p9_fid_destroy(attr_fid);
2071
2072 return ERR_PTR(err);
2073 }
2074 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2075
2076 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2077 u64 attr_size, int flags)
2078 {
2079 int err;
2080 struct p9_req_t *req;
2081 struct p9_client *clnt;
2082
2083 p9_debug(P9_DEBUG_9P,
2084 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2085 fid->fid, name, (long long)attr_size, flags);
2086 err = 0;
2087 clnt = fid->clnt;
2088 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2089 fid->fid, name, attr_size, flags);
2090 if (IS_ERR(req)) {
2091 err = PTR_ERR(req);
2092 goto error;
2093 }
2094 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2095 p9_free_req(clnt, req);
2096 error:
2097 return err;
2098 }
2099 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2100
2101 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2102 {
2103 int err, rsize, non_zc = 0;
2104 struct p9_client *clnt;
2105 struct p9_req_t *req;
2106 char *dataptr;
2107 struct kvec kv = {.iov_base = data, .iov_len = count};
2108 struct iov_iter to;
2109
2110 iov_iter_kvec(&to, READ | ITER_KVEC, &kv, 1, count);
2111
2112 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2113 fid->fid, (unsigned long long) offset, count);
2114
2115 err = 0;
2116 clnt = fid->clnt;
2117
2118 rsize = fid->iounit;
2119 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2120 rsize = clnt->msize - P9_READDIRHDRSZ;
2121
2122 if (count < rsize)
2123 rsize = count;
2124
2125 /* Don't bother zerocopy for small IO (< 1024) */
2126 if (clnt->trans_mod->zc_request && rsize > 1024) {
2127 /*
2128 * response header len is 11
2129 * PDU Header(7) + IO Size (4)
2130 */
2131 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0,
2132 11, "dqd", fid->fid, offset, rsize);
2133 } else {
2134 non_zc = 1;
2135 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2136 offset, rsize);
2137 }
2138 if (IS_ERR(req)) {
2139 err = PTR_ERR(req);
2140 goto error;
2141 }
2142
2143 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2144 if (err) {
2145 trace_9p_protocol_dump(clnt, req->rc);
2146 goto free_and_error;
2147 }
2148 if (rsize < count) {
2149 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize);
2150 count = rsize;
2151 }
2152
2153 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2154
2155 if (non_zc)
2156 memmove(data, dataptr, count);
2157
2158 p9_free_req(clnt, req);
2159 return count;
2160
2161 free_and_error:
2162 p9_free_req(clnt, req);
2163 error:
2164 return err;
2165 }
2166 EXPORT_SYMBOL(p9_client_readdir);
2167
2168 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode,
2169 dev_t rdev, kgid_t gid, struct p9_qid *qid)
2170 {
2171 int err;
2172 struct p9_client *clnt;
2173 struct p9_req_t *req;
2174
2175 err = 0;
2176 clnt = fid->clnt;
2177 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2178 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2179 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2180 MAJOR(rdev), MINOR(rdev), gid);
2181 if (IS_ERR(req))
2182 return PTR_ERR(req);
2183
2184 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2185 if (err) {
2186 trace_9p_protocol_dump(clnt, req->rc);
2187 goto error;
2188 }
2189 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2190 (unsigned long long)qid->path, qid->version);
2191
2192 error:
2193 p9_free_req(clnt, req);
2194 return err;
2195
2196 }
2197 EXPORT_SYMBOL(p9_client_mknod_dotl);
2198
2199 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode,
2200 kgid_t gid, struct p9_qid *qid)
2201 {
2202 int err;
2203 struct p9_client *clnt;
2204 struct p9_req_t *req;
2205
2206 err = 0;
2207 clnt = fid->clnt;
2208 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2209 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2210 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
2211 gid);
2212 if (IS_ERR(req))
2213 return PTR_ERR(req);
2214
2215 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2216 if (err) {
2217 trace_9p_protocol_dump(clnt, req->rc);
2218 goto error;
2219 }
2220 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2221 (unsigned long long)qid->path, qid->version);
2222
2223 error:
2224 p9_free_req(clnt, req);
2225 return err;
2226
2227 }
2228 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2229
2230 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2231 {
2232 int err;
2233 struct p9_client *clnt;
2234 struct p9_req_t *req;
2235
2236 err = 0;
2237 clnt = fid->clnt;
2238 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2239 "start %lld length %lld proc_id %d client_id %s\n",
2240 fid->fid, flock->type, flock->flags, flock->start,
2241 flock->length, flock->proc_id, flock->client_id);
2242
2243 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2244 flock->flags, flock->start, flock->length,
2245 flock->proc_id, flock->client_id);
2246
2247 if (IS_ERR(req))
2248 return PTR_ERR(req);
2249
2250 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2251 if (err) {
2252 trace_9p_protocol_dump(clnt, req->rc);
2253 goto error;
2254 }
2255 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2256 error:
2257 p9_free_req(clnt, req);
2258 return err;
2259
2260 }
2261 EXPORT_SYMBOL(p9_client_lock_dotl);
2262
2263 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2264 {
2265 int err;
2266 struct p9_client *clnt;
2267 struct p9_req_t *req;
2268
2269 err = 0;
2270 clnt = fid->clnt;
2271 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2272 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2273 glock->start, glock->length, glock->proc_id, glock->client_id);
2274
2275 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2276 glock->start, glock->length, glock->proc_id, glock->client_id);
2277
2278 if (IS_ERR(req))
2279 return PTR_ERR(req);
2280
2281 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2282 &glock->start, &glock->length, &glock->proc_id,
2283 &glock->client_id);
2284 if (err) {
2285 trace_9p_protocol_dump(clnt, req->rc);
2286 goto error;
2287 }
2288 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2289 "proc_id %d client_id %s\n", glock->type, glock->start,
2290 glock->length, glock->proc_id, glock->client_id);
2291 error:
2292 p9_free_req(clnt, req);
2293 return err;
2294 }
2295 EXPORT_SYMBOL(p9_client_getlock_dotl);
2296
2297 int p9_client_readlink(struct p9_fid *fid, char **target)
2298 {
2299 int err;
2300 struct p9_client *clnt;
2301 struct p9_req_t *req;
2302
2303 err = 0;
2304 clnt = fid->clnt;
2305 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2306
2307 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2308 if (IS_ERR(req))
2309 return PTR_ERR(req);
2310
2311 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2312 if (err) {
2313 trace_9p_protocol_dump(clnt, req->rc);
2314 goto error;
2315 }
2316 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2317 error:
2318 p9_free_req(clnt, req);
2319 return err;
2320 }
2321 EXPORT_SYMBOL(p9_client_readlink);
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