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1/*
2 * net/9p/clnt.c
3 *
4 * 9P Client
5 *
6 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to:
20 * Free Software Foundation
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02111-1301 USA
23 *
24 */
25
26#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
27
28#include <linux/module.h>
29#include <linux/errno.h>
30#include <linux/fs.h>
31#include <linux/poll.h>
32#include <linux/idr.h>
33#include <linux/mutex.h>
34#include <linux/slab.h>
35#include <linux/sched.h>
36#include <linux/uaccess.h>
37#include <net/9p/9p.h>
38#include <linux/parser.h>
39#include <net/9p/client.h>
40#include <net/9p/transport.h>
41#include "protocol.h"
42
43#define CREATE_TRACE_POINTS
44#include <trace/events/9p.h>
45
46/*
47 * Client Option Parsing (code inspired by NFS code)
48 * - a little lazy - parse all client options
49 */
50
51enum {
52 Opt_msize,
53 Opt_trans,
54 Opt_legacy,
55 Opt_version,
56 Opt_err,
57};
58
59static const match_table_t tokens = {
60 {Opt_msize, "msize=%u"},
61 {Opt_legacy, "noextend"},
62 {Opt_trans, "trans=%s"},
63 {Opt_version, "version=%s"},
64 {Opt_err, NULL},
65};
66
67inline int p9_is_proto_dotl(struct p9_client *clnt)
68{
69 return clnt->proto_version == p9_proto_2000L;
70}
71EXPORT_SYMBOL(p9_is_proto_dotl);
72
73inline int p9_is_proto_dotu(struct p9_client *clnt)
74{
75 return clnt->proto_version == p9_proto_2000u;
76}
77EXPORT_SYMBOL(p9_is_proto_dotu);
78
79/* Interpret mount option for protocol version */
80static int get_protocol_version(char *s)
81{
82 int version = -EINVAL;
83
84 if (!strcmp(s, "9p2000")) {
85 version = p9_proto_legacy;
86 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n");
87 } else if (!strcmp(s, "9p2000.u")) {
88 version = p9_proto_2000u;
89 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
90 } else if (!strcmp(s, "9p2000.L")) {
91 version = p9_proto_2000L;
92 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
93 } else
94 pr_info("Unknown protocol version %s\n", s);
95
96 return version;
97}
98
99/**
100 * parse_options - parse mount options into client structure
101 * @opts: options string passed from mount
102 * @clnt: existing v9fs client information
103 *
104 * Return 0 upon success, -ERRNO upon failure
105 */
106
107static int parse_opts(char *opts, struct p9_client *clnt)
108{
109 char *options, *tmp_options;
110 char *p;
111 substring_t args[MAX_OPT_ARGS];
112 int option;
113 char *s;
114 int ret = 0;
115
116 clnt->proto_version = p9_proto_2000u;
117 clnt->msize = 8192;
118
119 if (!opts)
120 return 0;
121
122 tmp_options = kstrdup(opts, GFP_KERNEL);
123 if (!tmp_options) {
124 p9_debug(P9_DEBUG_ERROR,
125 "failed to allocate copy of option string\n");
126 return -ENOMEM;
127 }
128 options = tmp_options;
129
130 while ((p = strsep(&options, ",")) != NULL) {
131 int token, r;
132 if (!*p)
133 continue;
134 token = match_token(p, tokens, args);
135 switch (token) {
136 case Opt_msize:
137 r = match_int(&args[0], &option);
138 if (r < 0) {
139 p9_debug(P9_DEBUG_ERROR,
140 "integer field, but no integer?\n");
141 ret = r;
142 continue;
143 }
144 clnt->msize = option;
145 break;
146 case Opt_trans:
147 s = match_strdup(&args[0]);
148 if (!s) {
149 ret = -ENOMEM;
150 p9_debug(P9_DEBUG_ERROR,
151 "problem allocating copy of trans arg\n");
152 goto free_and_return;
153 }
154 clnt->trans_mod = v9fs_get_trans_by_name(s);
155 if (clnt->trans_mod == NULL) {
156 pr_info("Could not find request transport: %s\n",
157 s);
158 ret = -EINVAL;
159 kfree(s);
160 goto free_and_return;
161 }
162 kfree(s);
163 break;
164 case Opt_legacy:
165 clnt->proto_version = p9_proto_legacy;
166 break;
167 case Opt_version:
168 s = match_strdup(&args[0]);
169 if (!s) {
170 ret = -ENOMEM;
171 p9_debug(P9_DEBUG_ERROR,
172 "problem allocating copy of version arg\n");
173 goto free_and_return;
174 }
175 ret = get_protocol_version(s);
176 if (ret == -EINVAL) {
177 kfree(s);
178 goto free_and_return;
179 }
180 kfree(s);
181 clnt->proto_version = ret;
182 break;
183 default:
184 continue;
185 }
186 }
187
188free_and_return:
189 kfree(tmp_options);
190 return ret;
191}
192
193/**
194 * p9_tag_alloc - lookup/allocate a request by tag
195 * @c: client session to lookup tag within
196 * @tag: numeric id for transaction
197 *
198 * this is a simple array lookup, but will grow the
199 * request_slots as necessary to accommodate transaction
200 * ids which did not previously have a slot.
201 *
202 * this code relies on the client spinlock to manage locks, its
203 * possible we should switch to something else, but I'd rather
204 * stick with something low-overhead for the common case.
205 *
206 */
207
208static struct p9_req_t *
209p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
210{
211 unsigned long flags;
212 int row, col;
213 struct p9_req_t *req;
214 int alloc_msize = min(c->msize, max_size);
215
216 /* This looks up the original request by tag so we know which
217 * buffer to read the data into */
218 tag++;
219
220 if (tag >= c->max_tag) {
221 spin_lock_irqsave(&c->lock, flags);
222 /* check again since original check was outside of lock */
223 while (tag >= c->max_tag) {
224 row = (tag / P9_ROW_MAXTAG);
225 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
226 sizeof(struct p9_req_t), GFP_ATOMIC);
227
228 if (!c->reqs[row]) {
229 pr_err("Couldn't grow tag array\n");
230 spin_unlock_irqrestore(&c->lock, flags);
231 return ERR_PTR(-ENOMEM);
232 }
233 for (col = 0; col < P9_ROW_MAXTAG; col++) {
234 c->reqs[row][col].status = REQ_STATUS_IDLE;
235 c->reqs[row][col].tc = NULL;
236 }
237 c->max_tag += P9_ROW_MAXTAG;
238 }
239 spin_unlock_irqrestore(&c->lock, flags);
240 }
241 row = tag / P9_ROW_MAXTAG;
242 col = tag % P9_ROW_MAXTAG;
243
244 req = &c->reqs[row][col];
245 if (!req->tc) {
246 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
247 if (!req->wq) {
248 pr_err("Couldn't grow tag array\n");
249 return ERR_PTR(-ENOMEM);
250 }
251 init_waitqueue_head(req->wq);
252 req->tc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
253 GFP_NOFS);
254 req->rc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
255 GFP_NOFS);
256 if ((!req->tc) || (!req->rc)) {
257 pr_err("Couldn't grow tag array\n");
258 kfree(req->tc);
259 kfree(req->rc);
260 kfree(req->wq);
261 req->tc = req->rc = NULL;
262 req->wq = NULL;
263 return ERR_PTR(-ENOMEM);
264 }
265 req->tc->capacity = alloc_msize;
266 req->rc->capacity = alloc_msize;
267 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
268 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
269 }
270
271 p9pdu_reset(req->tc);
272 p9pdu_reset(req->rc);
273
274 req->tc->tag = tag-1;
275 req->status = REQ_STATUS_ALLOC;
276
277 return &c->reqs[row][col];
278}
279
280/**
281 * p9_tag_lookup - lookup a request by tag
282 * @c: client session to lookup tag within
283 * @tag: numeric id for transaction
284 *
285 */
286
287struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
288{
289 int row, col;
290
291 /* This looks up the original request by tag so we know which
292 * buffer to read the data into */
293 tag++;
294
295 if(tag >= c->max_tag)
296 return NULL;
297
298 row = tag / P9_ROW_MAXTAG;
299 col = tag % P9_ROW_MAXTAG;
300
301 return &c->reqs[row][col];
302}
303EXPORT_SYMBOL(p9_tag_lookup);
304
305/**
306 * p9_tag_init - setup tags structure and contents
307 * @c: v9fs client struct
308 *
309 * This initializes the tags structure for each client instance.
310 *
311 */
312
313static int p9_tag_init(struct p9_client *c)
314{
315 int err = 0;
316
317 c->tagpool = p9_idpool_create();
318 if (IS_ERR(c->tagpool)) {
319 err = PTR_ERR(c->tagpool);
320 goto error;
321 }
322 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
323 if (err < 0) {
324 p9_idpool_destroy(c->tagpool);
325 goto error;
326 }
327 c->max_tag = 0;
328error:
329 return err;
330}
331
332/**
333 * p9_tag_cleanup - cleans up tags structure and reclaims resources
334 * @c: v9fs client struct
335 *
336 * This frees resources associated with the tags structure
337 *
338 */
339static void p9_tag_cleanup(struct p9_client *c)
340{
341 int row, col;
342
343 /* check to insure all requests are idle */
344 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
345 for (col = 0; col < P9_ROW_MAXTAG; col++) {
346 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
347 p9_debug(P9_DEBUG_MUX,
348 "Attempting to cleanup non-free tag %d,%d\n",
349 row, col);
350 /* TODO: delay execution of cleanup */
351 return;
352 }
353 }
354 }
355
356 if (c->tagpool) {
357 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
358 p9_idpool_destroy(c->tagpool);
359 }
360
361 /* free requests associated with tags */
362 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
363 for (col = 0; col < P9_ROW_MAXTAG; col++) {
364 kfree(c->reqs[row][col].wq);
365 kfree(c->reqs[row][col].tc);
366 kfree(c->reqs[row][col].rc);
367 }
368 kfree(c->reqs[row]);
369 }
370 c->max_tag = 0;
371}
372
373/**
374 * p9_free_req - free a request and clean-up as necessary
375 * c: client state
376 * r: request to release
377 *
378 */
379
380static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
381{
382 int tag = r->tc->tag;
383 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
384
385 r->status = REQ_STATUS_IDLE;
386 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
387 p9_idpool_put(tag, c->tagpool);
388}
389
390/**
391 * p9_client_cb - call back from transport to client
392 * c: client state
393 * req: request received
394 *
395 */
396void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
397{
398 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
399 wake_up(req->wq);
400 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
401}
402EXPORT_SYMBOL(p9_client_cb);
403
404/**
405 * p9_parse_header - parse header arguments out of a packet
406 * @pdu: packet to parse
407 * @size: size of packet
408 * @type: type of request
409 * @tag: tag of packet
410 * @rewind: set if we need to rewind offset afterwards
411 */
412
413int
414p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
415 int rewind)
416{
417 int8_t r_type;
418 int16_t r_tag;
419 int32_t r_size;
420 int offset = pdu->offset;
421 int err;
422
423 pdu->offset = 0;
424 if (pdu->size == 0)
425 pdu->size = 7;
426
427 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
428 if (err)
429 goto rewind_and_exit;
430
431 pdu->size = r_size;
432 pdu->id = r_type;
433 pdu->tag = r_tag;
434
435 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
436 pdu->size, pdu->id, pdu->tag);
437
438 if (type)
439 *type = r_type;
440 if (tag)
441 *tag = r_tag;
442 if (size)
443 *size = r_size;
444
445
446rewind_and_exit:
447 if (rewind)
448 pdu->offset = offset;
449 return err;
450}
451EXPORT_SYMBOL(p9_parse_header);
452
453/**
454 * p9_check_errors - check 9p packet for error return and process it
455 * @c: current client instance
456 * @req: request to parse and check for error conditions
457 *
458 * returns error code if one is discovered, otherwise returns 0
459 *
460 * this will have to be more complicated if we have multiple
461 * error packet types
462 */
463
464static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
465{
466 int8_t type;
467 int err;
468 int ecode;
469
470 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
471 /*
472 * dump the response from server
473 * This should be after check errors which poplulate pdu_fcall.
474 */
475 trace_9p_protocol_dump(c, req->rc);
476 if (err) {
477 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
478 return err;
479 }
480 if (type != P9_RERROR && type != P9_RLERROR)
481 return 0;
482
483 if (!p9_is_proto_dotl(c)) {
484 char *ename;
485 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
486 &ename, &ecode);
487 if (err)
488 goto out_err;
489
490 if (p9_is_proto_dotu(c))
491 err = -ecode;
492
493 if (!err || !IS_ERR_VALUE(err)) {
494 err = p9_errstr2errno(ename, strlen(ename));
495
496 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
497 -ecode, ename);
498 }
499 kfree(ename);
500 } else {
501 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
502 err = -ecode;
503
504 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
505 }
506
507 return err;
508
509out_err:
510 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
511
512 return err;
513}
514
515/**
516 * p9_check_zc_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 * @in_hdrlen: Size of response protocol buffer.
520 *
521 * returns error code if one is discovered, otherwise returns 0
522 *
523 * this will have to be more complicated if we have multiple
524 * error packet types
525 */
526
527static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
528 char *uidata, int in_hdrlen, int kern_buf)
529{
530 int err;
531 int ecode;
532 int8_t type;
533 char *ename = NULL;
534
535 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
536 /*
537 * dump the response from server
538 * This should be after parse_header which poplulate pdu_fcall.
539 */
540 trace_9p_protocol_dump(c, req->rc);
541 if (err) {
542 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
543 return err;
544 }
545
546 if (type != P9_RERROR && type != P9_RLERROR)
547 return 0;
548
549 if (!p9_is_proto_dotl(c)) {
550 /* Error is reported in string format */
551 uint16_t len;
552 /* 7 = header size for RERROR, 2 is the size of string len; */
553 int inline_len = in_hdrlen - (7 + 2);
554
555 /* Read the size of error string */
556 err = p9pdu_readf(req->rc, c->proto_version, "w", &len);
557 if (err)
558 goto out_err;
559
560 ename = kmalloc(len + 1, GFP_NOFS);
561 if (!ename) {
562 err = -ENOMEM;
563 goto out_err;
564 }
565 if (len <= inline_len) {
566 /* We have error in protocol buffer itself */
567 if (pdu_read(req->rc, ename, len)) {
568 err = -EFAULT;
569 goto out_free;
570
571 }
572 } else {
573 /*
574 * Part of the data is in user space buffer.
575 */
576 if (pdu_read(req->rc, ename, inline_len)) {
577 err = -EFAULT;
578 goto out_free;
579
580 }
581 if (kern_buf) {
582 memcpy(ename + inline_len, uidata,
583 len - inline_len);
584 } else {
585 err = copy_from_user(ename + inline_len,
586 uidata, len - inline_len);
587 if (err) {
588 err = -EFAULT;
589 goto out_free;
590 }
591 }
592 }
593 ename[len] = 0;
594 if (p9_is_proto_dotu(c)) {
595 /* For dotu we also have error code */
596 err = p9pdu_readf(req->rc,
597 c->proto_version, "d", &ecode);
598 if (err)
599 goto out_free;
600 err = -ecode;
601 }
602 if (!err || !IS_ERR_VALUE(err)) {
603 err = p9_errstr2errno(ename, strlen(ename));
604
605 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
606 -ecode, ename);
607 }
608 kfree(ename);
609 } else {
610 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
611 err = -ecode;
612
613 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
614 }
615 return err;
616
617out_free:
618 kfree(ename);
619out_err:
620 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
621 return err;
622}
623
624static struct p9_req_t *
625p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
626
627/**
628 * p9_client_flush - flush (cancel) a request
629 * @c: client state
630 * @oldreq: request to cancel
631 *
632 * This sents a flush for a particular request and links
633 * the flush request to the original request. The current
634 * code only supports a single flush request although the protocol
635 * allows for multiple flush requests to be sent for a single request.
636 *
637 */
638
639static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
640{
641 struct p9_req_t *req;
642 int16_t oldtag;
643 int err;
644
645 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
646 if (err)
647 return err;
648
649 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
650
651 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
652 if (IS_ERR(req))
653 return PTR_ERR(req);
654
655
656 /* if we haven't received a response for oldreq,
657 remove it from the list. */
658 spin_lock(&c->lock);
659 if (oldreq->status == REQ_STATUS_FLSH)
660 list_del(&oldreq->req_list);
661 spin_unlock(&c->lock);
662
663 p9_free_req(c, req);
664 return 0;
665}
666
667static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
668 int8_t type, int req_size,
669 const char *fmt, va_list ap)
670{
671 int tag, err;
672 struct p9_req_t *req;
673
674 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
675
676 /* we allow for any status other than disconnected */
677 if (c->status == Disconnected)
678 return ERR_PTR(-EIO);
679
680 /* if status is begin_disconnected we allow only clunk request */
681 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
682 return ERR_PTR(-EIO);
683
684 tag = P9_NOTAG;
685 if (type != P9_TVERSION) {
686 tag = p9_idpool_get(c->tagpool);
687 if (tag < 0)
688 return ERR_PTR(-ENOMEM);
689 }
690
691 req = p9_tag_alloc(c, tag, req_size);
692 if (IS_ERR(req))
693 return req;
694
695 /* marshall the data */
696 p9pdu_prepare(req->tc, tag, type);
697 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
698 if (err)
699 goto reterr;
700 p9pdu_finalize(c, req->tc);
701 trace_9p_client_req(c, type, tag);
702 return req;
703reterr:
704 p9_free_req(c, req);
705 return ERR_PTR(err);
706}
707
708/**
709 * p9_client_rpc - issue a request and wait for a response
710 * @c: client session
711 * @type: type of request
712 * @fmt: protocol format string (see protocol.c)
713 *
714 * Returns request structure (which client must free using p9_free_req)
715 */
716
717static struct p9_req_t *
718p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
719{
720 va_list ap;
721 int sigpending, err;
722 unsigned long flags;
723 struct p9_req_t *req;
724
725 va_start(ap, fmt);
726 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
727 va_end(ap);
728 if (IS_ERR(req))
729 return req;
730
731 if (signal_pending(current)) {
732 sigpending = 1;
733 clear_thread_flag(TIF_SIGPENDING);
734 } else
735 sigpending = 0;
736
737 err = c->trans_mod->request(c, req);
738 if (err < 0) {
739 if (err != -ERESTARTSYS && err != -EFAULT)
740 c->status = Disconnected;
741 goto reterr;
742 }
743again:
744 /* Wait for the response */
745 err = wait_event_interruptible(*req->wq,
746 req->status >= REQ_STATUS_RCVD);
747
748 if ((err == -ERESTARTSYS) && (c->status == Connected)
749 && (type == P9_TFLUSH)) {
750 sigpending = 1;
751 clear_thread_flag(TIF_SIGPENDING);
752 goto again;
753 }
754
755 if (req->status == REQ_STATUS_ERROR) {
756 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
757 err = req->t_err;
758 }
759 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
760 p9_debug(P9_DEBUG_MUX, "flushing\n");
761 sigpending = 1;
762 clear_thread_flag(TIF_SIGPENDING);
763
764 if (c->trans_mod->cancel(c, req))
765 p9_client_flush(c, req);
766
767 /* if we received the response anyway, don't signal error */
768 if (req->status == REQ_STATUS_RCVD)
769 err = 0;
770 }
771 if (sigpending) {
772 spin_lock_irqsave(¤t->sighand->siglock, flags);
773 recalc_sigpending();
774 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
775 }
776 if (err < 0)
777 goto reterr;
778
779 err = p9_check_errors(c, req);
780 trace_9p_client_res(c, type, req->rc->tag, err);
781 if (!err)
782 return req;
783reterr:
784 p9_free_req(c, req);
785 return ERR_PTR(err);
786}
787
788/**
789 * p9_client_zc_rpc - issue a request and wait for a response
790 * @c: client session
791 * @type: type of request
792 * @uidata: user bffer that should be ued for zero copy read
793 * @uodata: user buffer that shoud be user for zero copy write
794 * @inlen: read buffer size
795 * @olen: write buffer size
796 * @hdrlen: reader header size, This is the size of response protocol data
797 * @fmt: protocol format string (see protocol.c)
798 *
799 * Returns request structure (which client must free using p9_free_req)
800 */
801static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
802 char *uidata, char *uodata,
803 int inlen, int olen, int in_hdrlen,
804 int kern_buf, const char *fmt, ...)
805{
806 va_list ap;
807 int sigpending, err;
808 unsigned long flags;
809 struct p9_req_t *req;
810
811 va_start(ap, fmt);
812 /*
813 * We allocate a inline protocol data of only 4k bytes.
814 * The actual content is passed in zero-copy fashion.
815 */
816 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
817 va_end(ap);
818 if (IS_ERR(req))
819 return req;
820
821 if (signal_pending(current)) {
822 sigpending = 1;
823 clear_thread_flag(TIF_SIGPENDING);
824 } else
825 sigpending = 0;
826
827 /* If we are called with KERNEL_DS force kern_buf */
828 if (segment_eq(get_fs(), KERNEL_DS))
829 kern_buf = 1;
830
831 err = c->trans_mod->zc_request(c, req, uidata, uodata,
832 inlen, olen, in_hdrlen, kern_buf);
833 if (err < 0) {
834 if (err == -EIO)
835 c->status = Disconnected;
836 goto reterr;
837 }
838 if (req->status == REQ_STATUS_ERROR) {
839 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
840 err = req->t_err;
841 }
842 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
843 p9_debug(P9_DEBUG_MUX, "flushing\n");
844 sigpending = 1;
845 clear_thread_flag(TIF_SIGPENDING);
846
847 if (c->trans_mod->cancel(c, req))
848 p9_client_flush(c, req);
849
850 /* if we received the response anyway, don't signal error */
851 if (req->status == REQ_STATUS_RCVD)
852 err = 0;
853 }
854 if (sigpending) {
855 spin_lock_irqsave(¤t->sighand->siglock, flags);
856 recalc_sigpending();
857 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
858 }
859 if (err < 0)
860 goto reterr;
861
862 err = p9_check_zc_errors(c, req, uidata, in_hdrlen, kern_buf);
863 trace_9p_client_res(c, type, req->rc->tag, err);
864 if (!err)
865 return req;
866reterr:
867 p9_free_req(c, req);
868 return ERR_PTR(err);
869}
870
871static struct p9_fid *p9_fid_create(struct p9_client *clnt)
872{
873 int ret;
874 struct p9_fid *fid;
875 unsigned long flags;
876
877 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
878 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
879 if (!fid)
880 return ERR_PTR(-ENOMEM);
881
882 ret = p9_idpool_get(clnt->fidpool);
883 if (ret < 0) {
884 ret = -ENOSPC;
885 goto error;
886 }
887 fid->fid = ret;
888
889 memset(&fid->qid, 0, sizeof(struct p9_qid));
890 fid->mode = -1;
891 fid->uid = current_fsuid();
892 fid->clnt = clnt;
893 fid->rdir = NULL;
894 spin_lock_irqsave(&clnt->lock, flags);
895 list_add(&fid->flist, &clnt->fidlist);
896 spin_unlock_irqrestore(&clnt->lock, flags);
897
898 return fid;
899
900error:
901 kfree(fid);
902 return ERR_PTR(ret);
903}
904
905static void p9_fid_destroy(struct p9_fid *fid)
906{
907 struct p9_client *clnt;
908 unsigned long flags;
909
910 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
911 clnt = fid->clnt;
912 p9_idpool_put(fid->fid, clnt->fidpool);
913 spin_lock_irqsave(&clnt->lock, flags);
914 list_del(&fid->flist);
915 spin_unlock_irqrestore(&clnt->lock, flags);
916 kfree(fid->rdir);
917 kfree(fid);
918}
919
920static int p9_client_version(struct p9_client *c)
921{
922 int err = 0;
923 struct p9_req_t *req;
924 char *version;
925 int msize;
926
927 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
928 c->msize, c->proto_version);
929
930 switch (c->proto_version) {
931 case p9_proto_2000L:
932 req = p9_client_rpc(c, P9_TVERSION, "ds",
933 c->msize, "9P2000.L");
934 break;
935 case p9_proto_2000u:
936 req = p9_client_rpc(c, P9_TVERSION, "ds",
937 c->msize, "9P2000.u");
938 break;
939 case p9_proto_legacy:
940 req = p9_client_rpc(c, P9_TVERSION, "ds",
941 c->msize, "9P2000");
942 break;
943 default:
944 return -EINVAL;
945 break;
946 }
947
948 if (IS_ERR(req))
949 return PTR_ERR(req);
950
951 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
952 if (err) {
953 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
954 trace_9p_protocol_dump(c, req->rc);
955 goto error;
956 }
957
958 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
959 if (!strncmp(version, "9P2000.L", 8))
960 c->proto_version = p9_proto_2000L;
961 else if (!strncmp(version, "9P2000.u", 8))
962 c->proto_version = p9_proto_2000u;
963 else if (!strncmp(version, "9P2000", 6))
964 c->proto_version = p9_proto_legacy;
965 else {
966 err = -EREMOTEIO;
967 goto error;
968 }
969
970 if (msize < c->msize)
971 c->msize = msize;
972
973error:
974 kfree(version);
975 p9_free_req(c, req);
976
977 return err;
978}
979
980struct p9_client *p9_client_create(const char *dev_name, char *options)
981{
982 int err;
983 struct p9_client *clnt;
984
985 err = 0;
986 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
987 if (!clnt)
988 return ERR_PTR(-ENOMEM);
989
990 clnt->trans_mod = NULL;
991 clnt->trans = NULL;
992 spin_lock_init(&clnt->lock);
993 INIT_LIST_HEAD(&clnt->fidlist);
994
995 err = p9_tag_init(clnt);
996 if (err < 0)
997 goto free_client;
998
999 err = parse_opts(options, clnt);
1000 if (err < 0)
1001 goto destroy_tagpool;
1002
1003 if (!clnt->trans_mod)
1004 clnt->trans_mod = v9fs_get_default_trans();
1005
1006 if (clnt->trans_mod == NULL) {
1007 err = -EPROTONOSUPPORT;
1008 p9_debug(P9_DEBUG_ERROR,
1009 "No transport defined or default transport\n");
1010 goto destroy_tagpool;
1011 }
1012
1013 clnt->fidpool = p9_idpool_create();
1014 if (IS_ERR(clnt->fidpool)) {
1015 err = PTR_ERR(clnt->fidpool);
1016 goto put_trans;
1017 }
1018
1019 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1020 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1021
1022 err = clnt->trans_mod->create(clnt, dev_name, options);
1023 if (err)
1024 goto destroy_fidpool;
1025
1026 if (clnt->msize > clnt->trans_mod->maxsize)
1027 clnt->msize = clnt->trans_mod->maxsize;
1028
1029 err = p9_client_version(clnt);
1030 if (err)
1031 goto close_trans;
1032
1033 return clnt;
1034
1035close_trans:
1036 clnt->trans_mod->close(clnt);
1037destroy_fidpool:
1038 p9_idpool_destroy(clnt->fidpool);
1039put_trans:
1040 v9fs_put_trans(clnt->trans_mod);
1041destroy_tagpool:
1042 p9_idpool_destroy(clnt->tagpool);
1043free_client:
1044 kfree(clnt);
1045 return ERR_PTR(err);
1046}
1047EXPORT_SYMBOL(p9_client_create);
1048
1049void p9_client_destroy(struct p9_client *clnt)
1050{
1051 struct p9_fid *fid, *fidptr;
1052
1053 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1054
1055 if (clnt->trans_mod)
1056 clnt->trans_mod->close(clnt);
1057
1058 v9fs_put_trans(clnt->trans_mod);
1059
1060 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
1061 pr_info("Found fid %d not clunked\n", fid->fid);
1062 p9_fid_destroy(fid);
1063 }
1064
1065 if (clnt->fidpool)
1066 p9_idpool_destroy(clnt->fidpool);
1067
1068 p9_tag_cleanup(clnt);
1069
1070 kfree(clnt);
1071}
1072EXPORT_SYMBOL(p9_client_destroy);
1073
1074void p9_client_disconnect(struct p9_client *clnt)
1075{
1076 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1077 clnt->status = Disconnected;
1078}
1079EXPORT_SYMBOL(p9_client_disconnect);
1080
1081void p9_client_begin_disconnect(struct p9_client *clnt)
1082{
1083 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1084 clnt->status = BeginDisconnect;
1085}
1086EXPORT_SYMBOL(p9_client_begin_disconnect);
1087
1088struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1089 char *uname, u32 n_uname, char *aname)
1090{
1091 int err = 0;
1092 struct p9_req_t *req;
1093 struct p9_fid *fid;
1094 struct p9_qid qid;
1095
1096
1097 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1098 afid ? afid->fid : -1, uname, aname);
1099 fid = p9_fid_create(clnt);
1100 if (IS_ERR(fid)) {
1101 err = PTR_ERR(fid);
1102 fid = NULL;
1103 goto error;
1104 }
1105
1106 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
1107 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1108 if (IS_ERR(req)) {
1109 err = PTR_ERR(req);
1110 goto error;
1111 }
1112
1113 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
1114 if (err) {
1115 trace_9p_protocol_dump(clnt, req->rc);
1116 p9_free_req(clnt, req);
1117 goto error;
1118 }
1119
1120 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1121 qid.type, (unsigned long long)qid.path, qid.version);
1122
1123 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1124
1125 p9_free_req(clnt, req);
1126 return fid;
1127
1128error:
1129 if (fid)
1130 p9_fid_destroy(fid);
1131 return ERR_PTR(err);
1132}
1133EXPORT_SYMBOL(p9_client_attach);
1134
1135struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1136 char **wnames, int clone)
1137{
1138 int err;
1139 struct p9_client *clnt;
1140 struct p9_fid *fid;
1141 struct p9_qid *wqids;
1142 struct p9_req_t *req;
1143 uint16_t nwqids, count;
1144
1145 err = 0;
1146 wqids = NULL;
1147 clnt = oldfid->clnt;
1148 if (clone) {
1149 fid = p9_fid_create(clnt);
1150 if (IS_ERR(fid)) {
1151 err = PTR_ERR(fid);
1152 fid = NULL;
1153 goto error;
1154 }
1155
1156 fid->uid = oldfid->uid;
1157 } else
1158 fid = oldfid;
1159
1160
1161 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1162 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1163
1164 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1165 nwname, wnames);
1166 if (IS_ERR(req)) {
1167 err = PTR_ERR(req);
1168 goto error;
1169 }
1170
1171 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1172 if (err) {
1173 trace_9p_protocol_dump(clnt, req->rc);
1174 p9_free_req(clnt, req);
1175 goto clunk_fid;
1176 }
1177 p9_free_req(clnt, req);
1178
1179 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1180
1181 if (nwqids != nwname) {
1182 err = -ENOENT;
1183 goto clunk_fid;
1184 }
1185
1186 for (count = 0; count < nwqids; count++)
1187 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1188 count, wqids[count].type,
1189 (unsigned long long)wqids[count].path,
1190 wqids[count].version);
1191
1192 if (nwname)
1193 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1194 else
1195 fid->qid = oldfid->qid;
1196
1197 kfree(wqids);
1198 return fid;
1199
1200clunk_fid:
1201 kfree(wqids);
1202 p9_client_clunk(fid);
1203 fid = NULL;
1204
1205error:
1206 if (fid && (fid != oldfid))
1207 p9_fid_destroy(fid);
1208
1209 return ERR_PTR(err);
1210}
1211EXPORT_SYMBOL(p9_client_walk);
1212
1213int p9_client_open(struct p9_fid *fid, int mode)
1214{
1215 int err;
1216 struct p9_client *clnt;
1217 struct p9_req_t *req;
1218 struct p9_qid qid;
1219 int iounit;
1220
1221 clnt = fid->clnt;
1222 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1223 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1224 err = 0;
1225
1226 if (fid->mode != -1)
1227 return -EINVAL;
1228
1229 if (p9_is_proto_dotl(clnt))
1230 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1231 else
1232 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1233 if (IS_ERR(req)) {
1234 err = PTR_ERR(req);
1235 goto error;
1236 }
1237
1238 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1239 if (err) {
1240 trace_9p_protocol_dump(clnt, req->rc);
1241 goto free_and_error;
1242 }
1243
1244 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1245 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1246 (unsigned long long)qid.path, qid.version, iounit);
1247
1248 fid->mode = mode;
1249 fid->iounit = iounit;
1250
1251free_and_error:
1252 p9_free_req(clnt, req);
1253error:
1254 return err;
1255}
1256EXPORT_SYMBOL(p9_client_open);
1257
1258int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1259 gid_t gid, struct p9_qid *qid)
1260{
1261 int err = 0;
1262 struct p9_client *clnt;
1263 struct p9_req_t *req;
1264 int iounit;
1265
1266 p9_debug(P9_DEBUG_9P,
1267 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1268 ofid->fid, name, flags, mode, gid);
1269 clnt = ofid->clnt;
1270
1271 if (ofid->mode != -1)
1272 return -EINVAL;
1273
1274 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags,
1275 mode, gid);
1276 if (IS_ERR(req)) {
1277 err = PTR_ERR(req);
1278 goto error;
1279 }
1280
1281 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1282 if (err) {
1283 trace_9p_protocol_dump(clnt, req->rc);
1284 goto free_and_error;
1285 }
1286
1287 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1288 qid->type,
1289 (unsigned long long)qid->path,
1290 qid->version, iounit);
1291
1292 ofid->mode = mode;
1293 ofid->iounit = iounit;
1294
1295free_and_error:
1296 p9_free_req(clnt, req);
1297error:
1298 return err;
1299}
1300EXPORT_SYMBOL(p9_client_create_dotl);
1301
1302int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1303 char *extension)
1304{
1305 int err;
1306 struct p9_client *clnt;
1307 struct p9_req_t *req;
1308 struct p9_qid qid;
1309 int iounit;
1310
1311 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1312 fid->fid, name, perm, mode);
1313 err = 0;
1314 clnt = fid->clnt;
1315
1316 if (fid->mode != -1)
1317 return -EINVAL;
1318
1319 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1320 mode, extension);
1321 if (IS_ERR(req)) {
1322 err = PTR_ERR(req);
1323 goto error;
1324 }
1325
1326 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1327 if (err) {
1328 trace_9p_protocol_dump(clnt, req->rc);
1329 goto free_and_error;
1330 }
1331
1332 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1333 qid.type,
1334 (unsigned long long)qid.path,
1335 qid.version, iounit);
1336
1337 fid->mode = mode;
1338 fid->iounit = iounit;
1339
1340free_and_error:
1341 p9_free_req(clnt, req);
1342error:
1343 return err;
1344}
1345EXPORT_SYMBOL(p9_client_fcreate);
1346
1347int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid,
1348 struct p9_qid *qid)
1349{
1350 int err = 0;
1351 struct p9_client *clnt;
1352 struct p9_req_t *req;
1353
1354 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1355 dfid->fid, name, symtgt);
1356 clnt = dfid->clnt;
1357
1358 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt,
1359 gid);
1360 if (IS_ERR(req)) {
1361 err = PTR_ERR(req);
1362 goto error;
1363 }
1364
1365 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1366 if (err) {
1367 trace_9p_protocol_dump(clnt, req->rc);
1368 goto free_and_error;
1369 }
1370
1371 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1372 qid->type, (unsigned long long)qid->path, qid->version);
1373
1374free_and_error:
1375 p9_free_req(clnt, req);
1376error:
1377 return err;
1378}
1379EXPORT_SYMBOL(p9_client_symlink);
1380
1381int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1382{
1383 struct p9_client *clnt;
1384 struct p9_req_t *req;
1385
1386 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1387 dfid->fid, oldfid->fid, newname);
1388 clnt = dfid->clnt;
1389 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1390 newname);
1391 if (IS_ERR(req))
1392 return PTR_ERR(req);
1393
1394 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1395 p9_free_req(clnt, req);
1396 return 0;
1397}
1398EXPORT_SYMBOL(p9_client_link);
1399
1400int p9_client_fsync(struct p9_fid *fid, int datasync)
1401{
1402 int err;
1403 struct p9_client *clnt;
1404 struct p9_req_t *req;
1405
1406 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1407 fid->fid, datasync);
1408 err = 0;
1409 clnt = fid->clnt;
1410
1411 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1412 if (IS_ERR(req)) {
1413 err = PTR_ERR(req);
1414 goto error;
1415 }
1416
1417 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1418
1419 p9_free_req(clnt, req);
1420
1421error:
1422 return err;
1423}
1424EXPORT_SYMBOL(p9_client_fsync);
1425
1426int p9_client_clunk(struct p9_fid *fid)
1427{
1428 int err;
1429 struct p9_client *clnt;
1430 struct p9_req_t *req;
1431 int retries = 0;
1432
1433 if (!fid) {
1434 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1435 __func__, task_pid_nr(current));
1436 dump_stack();
1437 return 0;
1438 }
1439
1440again:
1441 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1442 retries);
1443 err = 0;
1444 clnt = fid->clnt;
1445
1446 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1447 if (IS_ERR(req)) {
1448 err = PTR_ERR(req);
1449 goto error;
1450 }
1451
1452 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1453
1454 p9_free_req(clnt, req);
1455error:
1456 /*
1457 * Fid is not valid even after a failed clunk
1458 * If interrupted, retry once then give up and
1459 * leak fid until umount.
1460 */
1461 if (err == -ERESTARTSYS) {
1462 if (retries++ == 0)
1463 goto again;
1464 } else
1465 p9_fid_destroy(fid);
1466 return err;
1467}
1468EXPORT_SYMBOL(p9_client_clunk);
1469
1470int p9_client_remove(struct p9_fid *fid)
1471{
1472 int err;
1473 struct p9_client *clnt;
1474 struct p9_req_t *req;
1475
1476 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1477 err = 0;
1478 clnt = fid->clnt;
1479
1480 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1481 if (IS_ERR(req)) {
1482 err = PTR_ERR(req);
1483 goto error;
1484 }
1485
1486 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1487
1488 p9_free_req(clnt, req);
1489error:
1490 if (err == -ERESTARTSYS)
1491 p9_client_clunk(fid);
1492 else
1493 p9_fid_destroy(fid);
1494 return err;
1495}
1496EXPORT_SYMBOL(p9_client_remove);
1497
1498int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1499{
1500 int err = 0;
1501 struct p9_req_t *req;
1502 struct p9_client *clnt;
1503
1504 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1505 dfid->fid, name, flags);
1506
1507 clnt = dfid->clnt;
1508 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1509 if (IS_ERR(req)) {
1510 err = PTR_ERR(req);
1511 goto error;
1512 }
1513 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1514
1515 p9_free_req(clnt, req);
1516error:
1517 return err;
1518}
1519EXPORT_SYMBOL(p9_client_unlinkat);
1520
1521int
1522p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1523 u32 count)
1524{
1525 char *dataptr;
1526 int kernel_buf = 0;
1527 struct p9_req_t *req;
1528 struct p9_client *clnt;
1529 int err, rsize, non_zc = 0;
1530
1531
1532 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1533 fid->fid, (unsigned long long) offset, count);
1534 err = 0;
1535 clnt = fid->clnt;
1536
1537 rsize = fid->iounit;
1538 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1539 rsize = clnt->msize - P9_IOHDRSZ;
1540
1541 if (count < rsize)
1542 rsize = count;
1543
1544 /* Don't bother zerocopy for small IO (< 1024) */
1545 if (clnt->trans_mod->zc_request && rsize > 1024) {
1546 char *indata;
1547 if (data) {
1548 kernel_buf = 1;
1549 indata = data;
1550 } else
1551 indata = (char *)udata;
1552 /*
1553 * response header len is 11
1554 * PDU Header(7) + IO Size (4)
1555 */
1556 req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0,
1557 11, kernel_buf, "dqd", fid->fid,
1558 offset, rsize);
1559 } else {
1560 non_zc = 1;
1561 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1562 rsize);
1563 }
1564 if (IS_ERR(req)) {
1565 err = PTR_ERR(req);
1566 goto error;
1567 }
1568
1569 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1570 if (err) {
1571 trace_9p_protocol_dump(clnt, req->rc);
1572 goto free_and_error;
1573 }
1574
1575 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1576
1577 if (non_zc) {
1578 if (data) {
1579 memmove(data, dataptr, count);
1580 } else {
1581 err = copy_to_user(udata, dataptr, count);
1582 if (err) {
1583 err = -EFAULT;
1584 goto free_and_error;
1585 }
1586 }
1587 }
1588 p9_free_req(clnt, req);
1589 return count;
1590
1591free_and_error:
1592 p9_free_req(clnt, req);
1593error:
1594 return err;
1595}
1596EXPORT_SYMBOL(p9_client_read);
1597
1598int
1599p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1600 u64 offset, u32 count)
1601{
1602 int err, rsize;
1603 int kernel_buf = 0;
1604 struct p9_client *clnt;
1605 struct p9_req_t *req;
1606
1607 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1608 fid->fid, (unsigned long long) offset, count);
1609 err = 0;
1610 clnt = fid->clnt;
1611
1612 rsize = fid->iounit;
1613 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1614 rsize = clnt->msize - P9_IOHDRSZ;
1615
1616 if (count < rsize)
1617 rsize = count;
1618
1619 /* Don't bother zerocopy for small IO (< 1024) */
1620 if (clnt->trans_mod->zc_request && rsize > 1024) {
1621 char *odata;
1622 if (data) {
1623 kernel_buf = 1;
1624 odata = data;
1625 } else
1626 odata = (char *)udata;
1627 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize,
1628 P9_ZC_HDR_SZ, kernel_buf, "dqd",
1629 fid->fid, offset, rsize);
1630 } else {
1631 if (data)
1632 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
1633 offset, rsize, data);
1634 else
1635 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
1636 offset, rsize, udata);
1637 }
1638 if (IS_ERR(req)) {
1639 err = PTR_ERR(req);
1640 goto error;
1641 }
1642
1643 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1644 if (err) {
1645 trace_9p_protocol_dump(clnt, req->rc);
1646 goto free_and_error;
1647 }
1648
1649 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1650
1651 p9_free_req(clnt, req);
1652 return count;
1653
1654free_and_error:
1655 p9_free_req(clnt, req);
1656error:
1657 return err;
1658}
1659EXPORT_SYMBOL(p9_client_write);
1660
1661struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1662{
1663 int err;
1664 struct p9_client *clnt;
1665 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1666 struct p9_req_t *req;
1667 u16 ignored;
1668
1669 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1670
1671 if (!ret)
1672 return ERR_PTR(-ENOMEM);
1673
1674 err = 0;
1675 clnt = fid->clnt;
1676
1677 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1678 if (IS_ERR(req)) {
1679 err = PTR_ERR(req);
1680 goto error;
1681 }
1682
1683 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1684 if (err) {
1685 trace_9p_protocol_dump(clnt, req->rc);
1686 p9_free_req(clnt, req);
1687 goto error;
1688 }
1689
1690 p9_debug(P9_DEBUG_9P,
1691 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1692 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1693 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1694 "<<< uid=%d gid=%d n_muid=%d\n",
1695 ret->size, ret->type, ret->dev, ret->qid.type,
1696 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1697 ret->atime, ret->mtime, (unsigned long long)ret->length,
1698 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1699 ret->n_uid, ret->n_gid, ret->n_muid);
1700
1701 p9_free_req(clnt, req);
1702 return ret;
1703
1704error:
1705 kfree(ret);
1706 return ERR_PTR(err);
1707}
1708EXPORT_SYMBOL(p9_client_stat);
1709
1710struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1711 u64 request_mask)
1712{
1713 int err;
1714 struct p9_client *clnt;
1715 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1716 GFP_KERNEL);
1717 struct p9_req_t *req;
1718
1719 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1720 fid->fid, request_mask);
1721
1722 if (!ret)
1723 return ERR_PTR(-ENOMEM);
1724
1725 err = 0;
1726 clnt = fid->clnt;
1727
1728 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1729 if (IS_ERR(req)) {
1730 err = PTR_ERR(req);
1731 goto error;
1732 }
1733
1734 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1735 if (err) {
1736 trace_9p_protocol_dump(clnt, req->rc);
1737 p9_free_req(clnt, req);
1738 goto error;
1739 }
1740
1741 p9_debug(P9_DEBUG_9P,
1742 "<<< RGETATTR st_result_mask=%lld\n"
1743 "<<< qid=%x.%llx.%x\n"
1744 "<<< st_mode=%8.8x st_nlink=%llu\n"
1745 "<<< st_uid=%d st_gid=%d\n"
1746 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1747 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1748 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1749 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1750 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1751 "<<< st_gen=%lld st_data_version=%lld",
1752 ret->st_result_mask, ret->qid.type, ret->qid.path,
1753 ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid,
1754 ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize,
1755 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1756 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1757 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1758 ret->st_gen, ret->st_data_version);
1759
1760 p9_free_req(clnt, req);
1761 return ret;
1762
1763error:
1764 kfree(ret);
1765 return ERR_PTR(err);
1766}
1767EXPORT_SYMBOL(p9_client_getattr_dotl);
1768
1769static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1770{
1771 int ret;
1772
1773 /* NOTE: size shouldn't include its own length */
1774 /* size[2] type[2] dev[4] qid[13] */
1775 /* mode[4] atime[4] mtime[4] length[8]*/
1776 /* name[s] uid[s] gid[s] muid[s] */
1777 ret = 2+4+13+4+4+4+8+2+2+2+2;
1778
1779 if (wst->name)
1780 ret += strlen(wst->name);
1781 if (wst->uid)
1782 ret += strlen(wst->uid);
1783 if (wst->gid)
1784 ret += strlen(wst->gid);
1785 if (wst->muid)
1786 ret += strlen(wst->muid);
1787
1788 if ((proto_version == p9_proto_2000u) ||
1789 (proto_version == p9_proto_2000L)) {
1790 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1791 if (wst->extension)
1792 ret += strlen(wst->extension);
1793 }
1794
1795 return ret;
1796}
1797
1798int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1799{
1800 int err;
1801 struct p9_req_t *req;
1802 struct p9_client *clnt;
1803
1804 err = 0;
1805 clnt = fid->clnt;
1806 wst->size = p9_client_statsize(wst, clnt->proto_version);
1807 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1808 p9_debug(P9_DEBUG_9P,
1809 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1810 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1811 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1812 " uid=%d gid=%d n_muid=%d\n",
1813 wst->size, wst->type, wst->dev, wst->qid.type,
1814 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1815 wst->atime, wst->mtime, (unsigned long long)wst->length,
1816 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1817 wst->n_uid, wst->n_gid, wst->n_muid);
1818
1819 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1820 if (IS_ERR(req)) {
1821 err = PTR_ERR(req);
1822 goto error;
1823 }
1824
1825 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1826
1827 p9_free_req(clnt, req);
1828error:
1829 return err;
1830}
1831EXPORT_SYMBOL(p9_client_wstat);
1832
1833int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1834{
1835 int err;
1836 struct p9_req_t *req;
1837 struct p9_client *clnt;
1838
1839 err = 0;
1840 clnt = fid->clnt;
1841 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1842 p9_debug(P9_DEBUG_9P,
1843 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1844 " atime_sec=%lld atime_nsec=%lld\n"
1845 " mtime_sec=%lld mtime_nsec=%lld\n",
1846 p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid,
1847 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1848 p9attr->mtime_sec, p9attr->mtime_nsec);
1849
1850 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1851
1852 if (IS_ERR(req)) {
1853 err = PTR_ERR(req);
1854 goto error;
1855 }
1856 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1857 p9_free_req(clnt, req);
1858error:
1859 return err;
1860}
1861EXPORT_SYMBOL(p9_client_setattr);
1862
1863int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1864{
1865 int err;
1866 struct p9_req_t *req;
1867 struct p9_client *clnt;
1868
1869 err = 0;
1870 clnt = fid->clnt;
1871
1872 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1873
1874 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1875 if (IS_ERR(req)) {
1876 err = PTR_ERR(req);
1877 goto error;
1878 }
1879
1880 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1881 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1882 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1883 if (err) {
1884 trace_9p_protocol_dump(clnt, req->rc);
1885 p9_free_req(clnt, req);
1886 goto error;
1887 }
1888
1889 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1890 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1891 "fsid %llu namelen %ld\n",
1892 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1893 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1894 sb->fsid, (long int)sb->namelen);
1895
1896 p9_free_req(clnt, req);
1897error:
1898 return err;
1899}
1900EXPORT_SYMBOL(p9_client_statfs);
1901
1902int p9_client_rename(struct p9_fid *fid,
1903 struct p9_fid *newdirfid, const char *name)
1904{
1905 int err;
1906 struct p9_req_t *req;
1907 struct p9_client *clnt;
1908
1909 err = 0;
1910 clnt = fid->clnt;
1911
1912 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1913 fid->fid, newdirfid->fid, name);
1914
1915 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1916 newdirfid->fid, name);
1917 if (IS_ERR(req)) {
1918 err = PTR_ERR(req);
1919 goto error;
1920 }
1921
1922 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1923
1924 p9_free_req(clnt, req);
1925error:
1926 return err;
1927}
1928EXPORT_SYMBOL(p9_client_rename);
1929
1930int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1931 struct p9_fid *newdirfid, const char *new_name)
1932{
1933 int err;
1934 struct p9_req_t *req;
1935 struct p9_client *clnt;
1936
1937 err = 0;
1938 clnt = olddirfid->clnt;
1939
1940 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1941 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1942 newdirfid->fid, new_name);
1943
1944 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1945 old_name, newdirfid->fid, new_name);
1946 if (IS_ERR(req)) {
1947 err = PTR_ERR(req);
1948 goto error;
1949 }
1950
1951 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1952 newdirfid->fid, new_name);
1953
1954 p9_free_req(clnt, req);
1955error:
1956 return err;
1957}
1958EXPORT_SYMBOL(p9_client_renameat);
1959
1960/*
1961 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1962 */
1963struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1964 const char *attr_name, u64 *attr_size)
1965{
1966 int err;
1967 struct p9_req_t *req;
1968 struct p9_client *clnt;
1969 struct p9_fid *attr_fid;
1970
1971 err = 0;
1972 clnt = file_fid->clnt;
1973 attr_fid = p9_fid_create(clnt);
1974 if (IS_ERR(attr_fid)) {
1975 err = PTR_ERR(attr_fid);
1976 attr_fid = NULL;
1977 goto error;
1978 }
1979 p9_debug(P9_DEBUG_9P,
1980 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
1981 file_fid->fid, attr_fid->fid, attr_name);
1982
1983 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
1984 file_fid->fid, attr_fid->fid, attr_name);
1985 if (IS_ERR(req)) {
1986 err = PTR_ERR(req);
1987 goto error;
1988 }
1989 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
1990 if (err) {
1991 trace_9p_protocol_dump(clnt, req->rc);
1992 p9_free_req(clnt, req);
1993 goto clunk_fid;
1994 }
1995 p9_free_req(clnt, req);
1996 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
1997 attr_fid->fid, *attr_size);
1998 return attr_fid;
1999clunk_fid:
2000 p9_client_clunk(attr_fid);
2001 attr_fid = NULL;
2002error:
2003 if (attr_fid && (attr_fid != file_fid))
2004 p9_fid_destroy(attr_fid);
2005
2006 return ERR_PTR(err);
2007}
2008EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2009
2010int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2011 u64 attr_size, int flags)
2012{
2013 int err;
2014 struct p9_req_t *req;
2015 struct p9_client *clnt;
2016
2017 p9_debug(P9_DEBUG_9P,
2018 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2019 fid->fid, name, (long long)attr_size, flags);
2020 err = 0;
2021 clnt = fid->clnt;
2022 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2023 fid->fid, name, attr_size, flags);
2024 if (IS_ERR(req)) {
2025 err = PTR_ERR(req);
2026 goto error;
2027 }
2028 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2029 p9_free_req(clnt, req);
2030error:
2031 return err;
2032}
2033EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2034
2035int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2036{
2037 int err, rsize, non_zc = 0;
2038 struct p9_client *clnt;
2039 struct p9_req_t *req;
2040 char *dataptr;
2041
2042 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2043 fid->fid, (unsigned long long) offset, count);
2044
2045 err = 0;
2046 clnt = fid->clnt;
2047
2048 rsize = fid->iounit;
2049 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2050 rsize = clnt->msize - P9_READDIRHDRSZ;
2051
2052 if (count < rsize)
2053 rsize = count;
2054
2055 /* Don't bother zerocopy for small IO (< 1024) */
2056 if (clnt->trans_mod->zc_request && rsize > 1024) {
2057 /*
2058 * response header len is 11
2059 * PDU Header(7) + IO Size (4)
2060 */
2061 req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0,
2062 11, 1, "dqd", fid->fid, offset, rsize);
2063 } else {
2064 non_zc = 1;
2065 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2066 offset, rsize);
2067 }
2068 if (IS_ERR(req)) {
2069 err = PTR_ERR(req);
2070 goto error;
2071 }
2072
2073 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2074 if (err) {
2075 trace_9p_protocol_dump(clnt, req->rc);
2076 goto free_and_error;
2077 }
2078
2079 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2080
2081 if (non_zc)
2082 memmove(data, dataptr, count);
2083
2084 p9_free_req(clnt, req);
2085 return count;
2086
2087free_and_error:
2088 p9_free_req(clnt, req);
2089error:
2090 return err;
2091}
2092EXPORT_SYMBOL(p9_client_readdir);
2093
2094int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
2095 dev_t rdev, gid_t gid, struct p9_qid *qid)
2096{
2097 int err;
2098 struct p9_client *clnt;
2099 struct p9_req_t *req;
2100
2101 err = 0;
2102 clnt = fid->clnt;
2103 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2104 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2105 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode,
2106 MAJOR(rdev), MINOR(rdev), gid);
2107 if (IS_ERR(req))
2108 return PTR_ERR(req);
2109
2110 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2111 if (err) {
2112 trace_9p_protocol_dump(clnt, req->rc);
2113 goto error;
2114 }
2115 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2116 (unsigned long long)qid->path, qid->version);
2117
2118error:
2119 p9_free_req(clnt, req);
2120 return err;
2121
2122}
2123EXPORT_SYMBOL(p9_client_mknod_dotl);
2124
2125int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
2126 gid_t gid, struct p9_qid *qid)
2127{
2128 int err;
2129 struct p9_client *clnt;
2130 struct p9_req_t *req;
2131
2132 err = 0;
2133 clnt = fid->clnt;
2134 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2135 fid->fid, name, mode, gid);
2136 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode,
2137 gid);
2138 if (IS_ERR(req))
2139 return PTR_ERR(req);
2140
2141 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2142 if (err) {
2143 trace_9p_protocol_dump(clnt, req->rc);
2144 goto error;
2145 }
2146 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2147 (unsigned long long)qid->path, qid->version);
2148
2149error:
2150 p9_free_req(clnt, req);
2151 return err;
2152
2153}
2154EXPORT_SYMBOL(p9_client_mkdir_dotl);
2155
2156int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2157{
2158 int err;
2159 struct p9_client *clnt;
2160 struct p9_req_t *req;
2161
2162 err = 0;
2163 clnt = fid->clnt;
2164 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2165 "start %lld length %lld proc_id %d client_id %s\n",
2166 fid->fid, flock->type, flock->flags, flock->start,
2167 flock->length, flock->proc_id, flock->client_id);
2168
2169 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2170 flock->flags, flock->start, flock->length,
2171 flock->proc_id, flock->client_id);
2172
2173 if (IS_ERR(req))
2174 return PTR_ERR(req);
2175
2176 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2177 if (err) {
2178 trace_9p_protocol_dump(clnt, req->rc);
2179 goto error;
2180 }
2181 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2182error:
2183 p9_free_req(clnt, req);
2184 return err;
2185
2186}
2187EXPORT_SYMBOL(p9_client_lock_dotl);
2188
2189int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2190{
2191 int err;
2192 struct p9_client *clnt;
2193 struct p9_req_t *req;
2194
2195 err = 0;
2196 clnt = fid->clnt;
2197 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2198 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2199 glock->start, glock->length, glock->proc_id, glock->client_id);
2200
2201 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2202 glock->start, glock->length, glock->proc_id, glock->client_id);
2203
2204 if (IS_ERR(req))
2205 return PTR_ERR(req);
2206
2207 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2208 &glock->start, &glock->length, &glock->proc_id,
2209 &glock->client_id);
2210 if (err) {
2211 trace_9p_protocol_dump(clnt, req->rc);
2212 goto error;
2213 }
2214 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2215 "proc_id %d client_id %s\n", glock->type, glock->start,
2216 glock->length, glock->proc_id, glock->client_id);
2217error:
2218 p9_free_req(clnt, req);
2219 return err;
2220}
2221EXPORT_SYMBOL(p9_client_getlock_dotl);
2222
2223int p9_client_readlink(struct p9_fid *fid, char **target)
2224{
2225 int err;
2226 struct p9_client *clnt;
2227 struct p9_req_t *req;
2228
2229 err = 0;
2230 clnt = fid->clnt;
2231 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2232
2233 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2234 if (IS_ERR(req))
2235 return PTR_ERR(req);
2236
2237 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2238 if (err) {
2239 trace_9p_protocol_dump(clnt, req->rc);
2240 goto error;
2241 }
2242 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2243error:
2244 p9_free_req(clnt, req);
2245 return err;
2246}
2247EXPORT_SYMBOL(p9_client_readlink);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * 9P Client
4 *
5 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
6 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
7 */
8
9#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
11#include <linux/module.h>
12#include <linux/errno.h>
13#include <linux/fs.h>
14#include <linux/poll.h>
15#include <linux/idr.h>
16#include <linux/mutex.h>
17#include <linux/slab.h>
18#include <linux/sched/signal.h>
19#include <linux/uaccess.h>
20#include <linux/uio.h>
21#include <linux/netfs.h>
22#include <net/9p/9p.h>
23#include <linux/parser.h>
24#include <linux/seq_file.h>
25#include <net/9p/client.h>
26#include <net/9p/transport.h>
27#include "protocol.h"
28
29#define CREATE_TRACE_POINTS
30#include <trace/events/9p.h>
31
32/* DEFAULT MSIZE = 32 pages worth of payload + P9_HDRSZ +
33 * room for write (16 extra) or read (11 extra) operands.
34 */
35
36#define DEFAULT_MSIZE ((128 * 1024) + P9_IOHDRSZ)
37
38/* Client Option Parsing (code inspired by NFS code)
39 * - a little lazy - parse all client options
40 */
41
42enum {
43 Opt_msize,
44 Opt_trans,
45 Opt_legacy,
46 Opt_version,
47 Opt_err,
48};
49
50static const match_table_t tokens = {
51 {Opt_msize, "msize=%u"},
52 {Opt_legacy, "noextend"},
53 {Opt_trans, "trans=%s"},
54 {Opt_version, "version=%s"},
55 {Opt_err, NULL},
56};
57
58inline int p9_is_proto_dotl(struct p9_client *clnt)
59{
60 return clnt->proto_version == p9_proto_2000L;
61}
62EXPORT_SYMBOL(p9_is_proto_dotl);
63
64inline int p9_is_proto_dotu(struct p9_client *clnt)
65{
66 return clnt->proto_version == p9_proto_2000u;
67}
68EXPORT_SYMBOL(p9_is_proto_dotu);
69
70int p9_show_client_options(struct seq_file *m, struct p9_client *clnt)
71{
72 if (clnt->msize != DEFAULT_MSIZE)
73 seq_printf(m, ",msize=%u", clnt->msize);
74 seq_printf(m, ",trans=%s", clnt->trans_mod->name);
75
76 switch (clnt->proto_version) {
77 case p9_proto_legacy:
78 seq_puts(m, ",noextend");
79 break;
80 case p9_proto_2000u:
81 seq_puts(m, ",version=9p2000.u");
82 break;
83 case p9_proto_2000L:
84 /* Default */
85 break;
86 }
87
88 if (clnt->trans_mod->show_options)
89 return clnt->trans_mod->show_options(m, clnt);
90 return 0;
91}
92EXPORT_SYMBOL(p9_show_client_options);
93
94/* Some error codes are taken directly from the server replies,
95 * make sure they are valid.
96 */
97static int safe_errno(int err)
98{
99 if (err > 0 || err < -MAX_ERRNO) {
100 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err);
101 return -EPROTO;
102 }
103 return err;
104}
105
106/* Interpret mount option for protocol version */
107static int get_protocol_version(char *s)
108{
109 int version = -EINVAL;
110
111 if (!strcmp(s, "9p2000")) {
112 version = p9_proto_legacy;
113 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n");
114 } else if (!strcmp(s, "9p2000.u")) {
115 version = p9_proto_2000u;
116 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
117 } else if (!strcmp(s, "9p2000.L")) {
118 version = p9_proto_2000L;
119 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
120 } else {
121 pr_info("Unknown protocol version %s\n", s);
122 }
123
124 return version;
125}
126
127/**
128 * parse_opts - parse mount options into client structure
129 * @opts: options string passed from mount
130 * @clnt: existing v9fs client information
131 *
132 * Return 0 upon success, -ERRNO upon failure
133 */
134
135static int parse_opts(char *opts, struct p9_client *clnt)
136{
137 char *options, *tmp_options;
138 char *p;
139 substring_t args[MAX_OPT_ARGS];
140 int option;
141 char *s;
142 int ret = 0;
143
144 clnt->proto_version = p9_proto_2000L;
145 clnt->msize = DEFAULT_MSIZE;
146
147 if (!opts)
148 return 0;
149
150 tmp_options = kstrdup(opts, GFP_KERNEL);
151 if (!tmp_options)
152 return -ENOMEM;
153 options = tmp_options;
154
155 while ((p = strsep(&options, ",")) != NULL) {
156 int token, r;
157
158 if (!*p)
159 continue;
160 token = match_token(p, tokens, args);
161 switch (token) {
162 case Opt_msize:
163 r = match_int(&args[0], &option);
164 if (r < 0) {
165 p9_debug(P9_DEBUG_ERROR,
166 "integer field, but no integer?\n");
167 ret = r;
168 continue;
169 }
170 if (option < 4096) {
171 p9_debug(P9_DEBUG_ERROR,
172 "msize should be at least 4k\n");
173 ret = -EINVAL;
174 continue;
175 }
176 clnt->msize = option;
177 break;
178 case Opt_trans:
179 s = match_strdup(&args[0]);
180 if (!s) {
181 ret = -ENOMEM;
182 p9_debug(P9_DEBUG_ERROR,
183 "problem allocating copy of trans arg\n");
184 goto free_and_return;
185 }
186
187 v9fs_put_trans(clnt->trans_mod);
188 clnt->trans_mod = v9fs_get_trans_by_name(s);
189 if (!clnt->trans_mod) {
190 pr_info("Could not find request transport: %s\n",
191 s);
192 ret = -EINVAL;
193 }
194 kfree(s);
195 break;
196 case Opt_legacy:
197 clnt->proto_version = p9_proto_legacy;
198 break;
199 case Opt_version:
200 s = match_strdup(&args[0]);
201 if (!s) {
202 ret = -ENOMEM;
203 p9_debug(P9_DEBUG_ERROR,
204 "problem allocating copy of version arg\n");
205 goto free_and_return;
206 }
207 r = get_protocol_version(s);
208 if (r < 0)
209 ret = r;
210 else
211 clnt->proto_version = r;
212 kfree(s);
213 break;
214 default:
215 continue;
216 }
217 }
218
219free_and_return:
220 if (ret)
221 v9fs_put_trans(clnt->trans_mod);
222 kfree(tmp_options);
223 return ret;
224}
225
226static int p9_fcall_init(struct p9_client *c, struct p9_fcall *fc,
227 int alloc_msize)
228{
229 if (likely(c->fcall_cache) && alloc_msize == c->msize) {
230 fc->sdata = kmem_cache_alloc(c->fcall_cache, GFP_NOFS);
231 fc->cache = c->fcall_cache;
232 } else {
233 fc->sdata = kmalloc(alloc_msize, GFP_NOFS);
234 fc->cache = NULL;
235 }
236 if (!fc->sdata)
237 return -ENOMEM;
238 fc->capacity = alloc_msize;
239 fc->id = 0;
240 fc->tag = P9_NOTAG;
241 return 0;
242}
243
244void p9_fcall_fini(struct p9_fcall *fc)
245{
246 /* sdata can be NULL for interrupted requests in trans_rdma,
247 * and kmem_cache_free does not do NULL-check for us
248 */
249 if (unlikely(!fc->sdata))
250 return;
251
252 if (fc->cache)
253 kmem_cache_free(fc->cache, fc->sdata);
254 else
255 kfree(fc->sdata);
256}
257EXPORT_SYMBOL(p9_fcall_fini);
258
259static struct kmem_cache *p9_req_cache;
260
261/**
262 * p9_tag_alloc - Allocate a new request.
263 * @c: Client session.
264 * @type: Transaction type.
265 * @t_size: Buffer size for holding this request
266 * (automatic calculation by format template if 0).
267 * @r_size: Buffer size for holding server's reply on this request
268 * (automatic calculation by format template if 0).
269 * @fmt: Format template for assembling 9p request message
270 * (see p9pdu_vwritef).
271 * @ap: Variable arguments to be fed to passed format template
272 * (see p9pdu_vwritef).
273 *
274 * Context: Process context.
275 * Return: Pointer to new request.
276 */
277static struct p9_req_t *
278p9_tag_alloc(struct p9_client *c, int8_t type, uint t_size, uint r_size,
279 const char *fmt, va_list ap)
280{
281 struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS);
282 int alloc_tsize;
283 int alloc_rsize;
284 int tag;
285 va_list apc;
286
287 va_copy(apc, ap);
288 alloc_tsize = min_t(size_t, c->msize,
289 t_size ?: p9_msg_buf_size(c, type, fmt, apc));
290 va_end(apc);
291
292 alloc_rsize = min_t(size_t, c->msize,
293 r_size ?: p9_msg_buf_size(c, type + 1, fmt, ap));
294
295 if (!req)
296 return ERR_PTR(-ENOMEM);
297
298 if (p9_fcall_init(c, &req->tc, alloc_tsize))
299 goto free_req;
300 if (p9_fcall_init(c, &req->rc, alloc_rsize))
301 goto free;
302
303 p9pdu_reset(&req->tc);
304 p9pdu_reset(&req->rc);
305 req->t_err = 0;
306 req->status = REQ_STATUS_ALLOC;
307 /* refcount needs to be set to 0 before inserting into the idr
308 * so p9_tag_lookup does not accept a request that is not fully
309 * initialized. refcount_set to 2 below will mark request ready.
310 */
311 refcount_set(&req->refcount, 0);
312 init_waitqueue_head(&req->wq);
313 INIT_LIST_HEAD(&req->req_list);
314
315 idr_preload(GFP_NOFS);
316 spin_lock_irq(&c->lock);
317 if (type == P9_TVERSION)
318 tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1,
319 GFP_NOWAIT);
320 else
321 tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT);
322 req->tc.tag = tag;
323 spin_unlock_irq(&c->lock);
324 idr_preload_end();
325 if (tag < 0)
326 goto free;
327
328 /* Init ref to two because in the general case there is one ref
329 * that is put asynchronously by a writer thread, one ref
330 * temporarily given by p9_tag_lookup and put by p9_client_cb
331 * in the recv thread, and one ref put by p9_req_put in the
332 * main thread. The only exception is virtio that does not use
333 * p9_tag_lookup but does not have a writer thread either
334 * (the write happens synchronously in the request/zc_request
335 * callback), so p9_client_cb eats the second ref there
336 * as the pointer is duplicated directly by virtqueue_add_sgs()
337 */
338 refcount_set(&req->refcount, 2);
339
340 return req;
341
342free:
343 p9_fcall_fini(&req->tc);
344 p9_fcall_fini(&req->rc);
345free_req:
346 kmem_cache_free(p9_req_cache, req);
347 return ERR_PTR(-ENOMEM);
348}
349
350/**
351 * p9_tag_lookup - Look up a request by tag.
352 * @c: Client session.
353 * @tag: Transaction ID.
354 *
355 * Context: Any context.
356 * Return: A request, or %NULL if there is no request with that tag.
357 */
358struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
359{
360 struct p9_req_t *req;
361
362 rcu_read_lock();
363again:
364 req = idr_find(&c->reqs, tag);
365 if (req) {
366 /* We have to be careful with the req found under rcu_read_lock
367 * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the
368 * ref again without corrupting other data, then check again
369 * that the tag matches once we have the ref
370 */
371 if (!p9_req_try_get(req))
372 goto again;
373 if (req->tc.tag != tag) {
374 p9_req_put(c, req);
375 goto again;
376 }
377 }
378 rcu_read_unlock();
379
380 return req;
381}
382EXPORT_SYMBOL(p9_tag_lookup);
383
384/**
385 * p9_tag_remove - Remove a tag.
386 * @c: Client session.
387 * @r: Request of reference.
388 *
389 * Context: Any context.
390 */
391static void p9_tag_remove(struct p9_client *c, struct p9_req_t *r)
392{
393 unsigned long flags;
394 u16 tag = r->tc.tag;
395
396 p9_debug(P9_DEBUG_MUX, "freeing clnt %p req %p tag: %d\n", c, r, tag);
397 spin_lock_irqsave(&c->lock, flags);
398 idr_remove(&c->reqs, tag);
399 spin_unlock_irqrestore(&c->lock, flags);
400}
401
402int p9_req_put(struct p9_client *c, struct p9_req_t *r)
403{
404 if (refcount_dec_and_test(&r->refcount)) {
405 p9_tag_remove(c, r);
406
407 p9_fcall_fini(&r->tc);
408 p9_fcall_fini(&r->rc);
409 kmem_cache_free(p9_req_cache, r);
410 return 1;
411 }
412 return 0;
413}
414EXPORT_SYMBOL(p9_req_put);
415
416/**
417 * p9_tag_cleanup - cleans up tags structure and reclaims resources
418 * @c: v9fs client struct
419 *
420 * This frees resources associated with the tags structure
421 *
422 */
423static void p9_tag_cleanup(struct p9_client *c)
424{
425 struct p9_req_t *req;
426 int id;
427
428 rcu_read_lock();
429 idr_for_each_entry(&c->reqs, req, id) {
430 pr_info("Tag %d still in use\n", id);
431 if (p9_req_put(c, req) == 0)
432 pr_warn("Packet with tag %d has still references",
433 req->tc.tag);
434 }
435 rcu_read_unlock();
436}
437
438/**
439 * p9_client_cb - call back from transport to client
440 * @c: client state
441 * @req: request received
442 * @status: request status, one of REQ_STATUS_*
443 *
444 */
445void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status)
446{
447 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag);
448
449 /* This barrier is needed to make sure any change made to req before
450 * the status change is visible to another thread
451 */
452 smp_wmb();
453 WRITE_ONCE(req->status, status);
454
455 wake_up(&req->wq);
456 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag);
457 p9_req_put(c, req);
458}
459EXPORT_SYMBOL(p9_client_cb);
460
461/**
462 * p9_parse_header - parse header arguments out of a packet
463 * @pdu: packet to parse
464 * @size: size of packet
465 * @type: type of request
466 * @tag: tag of packet
467 * @rewind: set if we need to rewind offset afterwards
468 */
469
470int
471p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type,
472 int16_t *tag, int rewind)
473{
474 s8 r_type;
475 s16 r_tag;
476 s32 r_size;
477 int offset = pdu->offset;
478 int err;
479
480 pdu->offset = 0;
481
482 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
483 if (err)
484 goto rewind_and_exit;
485
486 if (type)
487 *type = r_type;
488 if (tag)
489 *tag = r_tag;
490 if (size)
491 *size = r_size;
492
493 if (pdu->size != r_size || r_size < 7) {
494 err = -EINVAL;
495 goto rewind_and_exit;
496 }
497
498 pdu->id = r_type;
499 pdu->tag = r_tag;
500
501 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
502 pdu->size, pdu->id, pdu->tag);
503
504rewind_and_exit:
505 if (rewind)
506 pdu->offset = offset;
507 return err;
508}
509EXPORT_SYMBOL(p9_parse_header);
510
511/**
512 * p9_check_errors - check 9p packet for error return and process it
513 * @c: current client instance
514 * @req: request to parse and check for error conditions
515 *
516 * returns error code if one is discovered, otherwise returns 0
517 *
518 * this will have to be more complicated if we have multiple
519 * error packet types
520 */
521
522static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
523{
524 s8 type;
525 int err;
526 int ecode;
527
528 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0);
529 if (req->rc.size > req->rc.capacity && !req->rc.zc) {
530 pr_err("requested packet size too big: %d does not fit %zu (type=%d)\n",
531 req->rc.size, req->rc.capacity, req->rc.id);
532 return -EIO;
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 = NULL;
547
548 err = p9pdu_readf(&req->rc, c->proto_version, "s?d",
549 &ename, &ecode);
550 if (err) {
551 kfree(ename);
552 goto out_err;
553 }
554
555 if (p9_is_proto_dotu(c) && ecode < 512)
556 err = -ecode;
557
558 if (!err) {
559 err = p9_errstr2errno(ename, strlen(ename));
560
561 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
562 -ecode, ename);
563 }
564 kfree(ename);
565 } else {
566 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode);
567 if (err)
568 goto out_err;
569 err = -ecode;
570
571 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
572 }
573
574 return err;
575
576out_err:
577 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
578
579 return err;
580}
581
582static struct p9_req_t *
583p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
584
585/**
586 * p9_client_flush - flush (cancel) a request
587 * @c: client state
588 * @oldreq: request to cancel
589 *
590 * This sents a flush for a particular request and links
591 * the flush request to the original request. The current
592 * code only supports a single flush request although the protocol
593 * allows for multiple flush requests to be sent for a single request.
594 *
595 */
596
597static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
598{
599 struct p9_req_t *req;
600 s16 oldtag;
601 int err;
602
603 err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1);
604 if (err)
605 return err;
606
607 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
608
609 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
610 if (IS_ERR(req))
611 return PTR_ERR(req);
612
613 /* if we haven't received a response for oldreq,
614 * remove it from the list
615 */
616 if (READ_ONCE(oldreq->status) == REQ_STATUS_SENT) {
617 if (c->trans_mod->cancelled)
618 c->trans_mod->cancelled(c, oldreq);
619 }
620
621 p9_req_put(c, req);
622 return 0;
623}
624
625static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
626 int8_t type, uint t_size, uint r_size,
627 const char *fmt, va_list ap)
628{
629 int err;
630 struct p9_req_t *req;
631 va_list apc;
632
633 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
634
635 /* we allow for any status other than disconnected */
636 if (c->status == Disconnected)
637 return ERR_PTR(-EIO);
638
639 /* if status is begin_disconnected we allow only clunk request */
640 if (c->status == BeginDisconnect && type != P9_TCLUNK)
641 return ERR_PTR(-EIO);
642
643 va_copy(apc, ap);
644 req = p9_tag_alloc(c, type, t_size, r_size, fmt, apc);
645 va_end(apc);
646 if (IS_ERR(req))
647 return req;
648
649 /* marshall the data */
650 p9pdu_prepare(&req->tc, req->tc.tag, type);
651 err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap);
652 if (err)
653 goto reterr;
654 p9pdu_finalize(c, &req->tc);
655 trace_9p_client_req(c, type, req->tc.tag);
656 return req;
657reterr:
658 p9_req_put(c, req);
659 /* We have to put also the 2nd reference as it won't be used */
660 p9_req_put(c, req);
661 return ERR_PTR(err);
662}
663
664/**
665 * p9_client_rpc - issue a request and wait for a response
666 * @c: client session
667 * @type: type of request
668 * @fmt: protocol format string (see protocol.c)
669 *
670 * Returns request structure (which client must free using p9_req_put)
671 */
672
673static struct p9_req_t *
674p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
675{
676 va_list ap;
677 int sigpending, err;
678 unsigned long flags;
679 struct p9_req_t *req;
680 /* Passing zero for tsize/rsize to p9_client_prepare_req() tells it to
681 * auto determine an appropriate (small) request/response size
682 * according to actual message data being sent. Currently RDMA
683 * transport is excluded from this response message size optimization,
684 * as it would not cope with it, due to its pooled response buffers
685 * (using an optimized request size for RDMA as well though).
686 */
687 const uint tsize = 0;
688 const uint rsize = c->trans_mod->pooled_rbuffers ? c->msize : 0;
689
690 va_start(ap, fmt);
691 req = p9_client_prepare_req(c, type, tsize, rsize, fmt, ap);
692 va_end(ap);
693 if (IS_ERR(req))
694 return req;
695
696 req->tc.zc = false;
697 req->rc.zc = false;
698
699 if (signal_pending(current)) {
700 sigpending = 1;
701 clear_thread_flag(TIF_SIGPENDING);
702 } else {
703 sigpending = 0;
704 }
705
706 err = c->trans_mod->request(c, req);
707 if (err < 0) {
708 /* write won't happen */
709 p9_req_put(c, req);
710 if (err != -ERESTARTSYS && err != -EFAULT)
711 c->status = Disconnected;
712 goto recalc_sigpending;
713 }
714again:
715 /* Wait for the response */
716 err = wait_event_killable(req->wq,
717 READ_ONCE(req->status) >= REQ_STATUS_RCVD);
718
719 /* Make sure our req is coherent with regard to updates in other
720 * threads - echoes to wmb() in the callback
721 */
722 smp_rmb();
723
724 if (err == -ERESTARTSYS && c->status == Connected &&
725 type == P9_TFLUSH) {
726 sigpending = 1;
727 clear_thread_flag(TIF_SIGPENDING);
728 goto again;
729 }
730
731 if (READ_ONCE(req->status) == REQ_STATUS_ERROR) {
732 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
733 err = req->t_err;
734 }
735 if (err == -ERESTARTSYS && c->status == Connected) {
736 p9_debug(P9_DEBUG_MUX, "flushing\n");
737 sigpending = 1;
738 clear_thread_flag(TIF_SIGPENDING);
739
740 if (c->trans_mod->cancel(c, req))
741 p9_client_flush(c, req);
742
743 /* if we received the response anyway, don't signal error */
744 if (READ_ONCE(req->status) == REQ_STATUS_RCVD)
745 err = 0;
746 }
747recalc_sigpending:
748 if (sigpending) {
749 spin_lock_irqsave(¤t->sighand->siglock, flags);
750 recalc_sigpending();
751 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
752 }
753 if (err < 0)
754 goto reterr;
755
756 err = p9_check_errors(c, req);
757 trace_9p_client_res(c, type, req->rc.tag, err);
758 if (!err)
759 return req;
760reterr:
761 p9_req_put(c, req);
762 return ERR_PTR(safe_errno(err));
763}
764
765/**
766 * p9_client_zc_rpc - issue a request and wait for a response
767 * @c: client session
768 * @type: type of request
769 * @uidata: destination for zero copy read
770 * @uodata: source for zero copy write
771 * @inlen: read buffer size
772 * @olen: write buffer size
773 * @in_hdrlen: reader header size, This is the size of response protocol data
774 * @fmt: protocol format string (see protocol.c)
775 *
776 * Returns request structure (which client must free using p9_req_put)
777 */
778static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
779 struct iov_iter *uidata,
780 struct iov_iter *uodata,
781 int inlen, int olen, int in_hdrlen,
782 const char *fmt, ...)
783{
784 va_list ap;
785 int sigpending, err;
786 unsigned long flags;
787 struct p9_req_t *req;
788
789 va_start(ap, fmt);
790 /* We allocate a inline protocol data of only 4k bytes.
791 * The actual content is passed in zero-copy fashion.
792 */
793 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, P9_ZC_HDR_SZ, fmt, ap);
794 va_end(ap);
795 if (IS_ERR(req))
796 return req;
797
798 req->tc.zc = true;
799 req->rc.zc = true;
800
801 if (signal_pending(current)) {
802 sigpending = 1;
803 clear_thread_flag(TIF_SIGPENDING);
804 } else {
805 sigpending = 0;
806 }
807
808 err = c->trans_mod->zc_request(c, req, uidata, uodata,
809 inlen, olen, in_hdrlen);
810 if (err < 0) {
811 if (err == -EIO)
812 c->status = Disconnected;
813 if (err != -ERESTARTSYS)
814 goto recalc_sigpending;
815 }
816 if (READ_ONCE(req->status) == REQ_STATUS_ERROR) {
817 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
818 err = req->t_err;
819 }
820 if (err == -ERESTARTSYS && c->status == Connected) {
821 p9_debug(P9_DEBUG_MUX, "flushing\n");
822 sigpending = 1;
823 clear_thread_flag(TIF_SIGPENDING);
824
825 if (c->trans_mod->cancel(c, req))
826 p9_client_flush(c, req);
827
828 /* if we received the response anyway, don't signal error */
829 if (READ_ONCE(req->status) == REQ_STATUS_RCVD)
830 err = 0;
831 }
832recalc_sigpending:
833 if (sigpending) {
834 spin_lock_irqsave(¤t->sighand->siglock, flags);
835 recalc_sigpending();
836 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
837 }
838 if (err < 0)
839 goto reterr;
840
841 err = p9_check_errors(c, req);
842 trace_9p_client_res(c, type, req->rc.tag, err);
843 if (!err)
844 return req;
845reterr:
846 p9_req_put(c, req);
847 return ERR_PTR(safe_errno(err));
848}
849
850static struct p9_fid *p9_fid_create(struct p9_client *clnt)
851{
852 int ret;
853 struct p9_fid *fid;
854
855 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
856 fid = kzalloc(sizeof(*fid), GFP_KERNEL);
857 if (!fid)
858 return NULL;
859
860 fid->mode = -1;
861 fid->uid = current_fsuid();
862 fid->clnt = clnt;
863 refcount_set(&fid->count, 1);
864
865 idr_preload(GFP_KERNEL);
866 spin_lock_irq(&clnt->lock);
867 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1,
868 GFP_NOWAIT);
869 spin_unlock_irq(&clnt->lock);
870 idr_preload_end();
871 if (!ret) {
872 trace_9p_fid_ref(fid, P9_FID_REF_CREATE);
873 return fid;
874 }
875
876 kfree(fid);
877 return NULL;
878}
879
880static void p9_fid_destroy(struct p9_fid *fid)
881{
882 struct p9_client *clnt;
883 unsigned long flags;
884
885 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
886 trace_9p_fid_ref(fid, P9_FID_REF_DESTROY);
887 clnt = fid->clnt;
888 spin_lock_irqsave(&clnt->lock, flags);
889 idr_remove(&clnt->fids, fid->fid);
890 spin_unlock_irqrestore(&clnt->lock, flags);
891 kfree(fid->rdir);
892 kfree(fid);
893}
894
895/* We also need to export tracepoint symbols for tracepoint_enabled() */
896EXPORT_TRACEPOINT_SYMBOL(9p_fid_ref);
897
898void do_trace_9p_fid_get(struct p9_fid *fid)
899{
900 trace_9p_fid_ref(fid, P9_FID_REF_GET);
901}
902EXPORT_SYMBOL(do_trace_9p_fid_get);
903
904void do_trace_9p_fid_put(struct p9_fid *fid)
905{
906 trace_9p_fid_ref(fid, P9_FID_REF_PUT);
907}
908EXPORT_SYMBOL(do_trace_9p_fid_put);
909
910static int p9_client_version(struct p9_client *c)
911{
912 int err;
913 struct p9_req_t *req;
914 char *version = NULL;
915 int msize;
916
917 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
918 c->msize, c->proto_version);
919
920 switch (c->proto_version) {
921 case p9_proto_2000L:
922 req = p9_client_rpc(c, P9_TVERSION, "ds",
923 c->msize, "9P2000.L");
924 break;
925 case p9_proto_2000u:
926 req = p9_client_rpc(c, P9_TVERSION, "ds",
927 c->msize, "9P2000.u");
928 break;
929 case p9_proto_legacy:
930 req = p9_client_rpc(c, P9_TVERSION, "ds",
931 c->msize, "9P2000");
932 break;
933 default:
934 return -EINVAL;
935 }
936
937 if (IS_ERR(req))
938 return PTR_ERR(req);
939
940 err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version);
941 if (err) {
942 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
943 trace_9p_protocol_dump(c, &req->rc);
944 goto error;
945 }
946
947 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
948 if (!strncmp(version, "9P2000.L", 8)) {
949 c->proto_version = p9_proto_2000L;
950 } else if (!strncmp(version, "9P2000.u", 8)) {
951 c->proto_version = p9_proto_2000u;
952 } else if (!strncmp(version, "9P2000", 6)) {
953 c->proto_version = p9_proto_legacy;
954 } else {
955 p9_debug(P9_DEBUG_ERROR,
956 "server returned an unknown version: %s\n", version);
957 err = -EREMOTEIO;
958 goto error;
959 }
960
961 if (msize < 4096) {
962 p9_debug(P9_DEBUG_ERROR,
963 "server returned a msize < 4096: %d\n", msize);
964 err = -EREMOTEIO;
965 goto error;
966 }
967 if (msize < c->msize)
968 c->msize = msize;
969
970error:
971 kfree(version);
972 p9_req_put(c, req);
973
974 return err;
975}
976
977struct p9_client *p9_client_create(const char *dev_name, char *options)
978{
979 int err;
980 static atomic_t seqno = ATOMIC_INIT(0);
981 struct p9_client *clnt;
982 char *client_id;
983 char *cache_name;
984
985 clnt = kmalloc(sizeof(*clnt), GFP_KERNEL);
986 if (!clnt)
987 return ERR_PTR(-ENOMEM);
988
989 clnt->trans_mod = NULL;
990 clnt->trans = NULL;
991 clnt->fcall_cache = NULL;
992
993 client_id = utsname()->nodename;
994 memcpy(clnt->name, client_id, strlen(client_id) + 1);
995
996 spin_lock_init(&clnt->lock);
997 idr_init(&clnt->fids);
998 idr_init(&clnt->reqs);
999
1000 err = parse_opts(options, clnt);
1001 if (err < 0)
1002 goto free_client;
1003
1004 if (!clnt->trans_mod)
1005 clnt->trans_mod = v9fs_get_default_trans();
1006
1007 if (!clnt->trans_mod) {
1008 err = -EPROTONOSUPPORT;
1009 p9_debug(P9_DEBUG_ERROR,
1010 "No transport defined or default transport\n");
1011 goto free_client;
1012 }
1013
1014 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1015 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1016
1017 err = clnt->trans_mod->create(clnt, dev_name, options);
1018 if (err)
1019 goto put_trans;
1020
1021 if (clnt->msize > clnt->trans_mod->maxsize) {
1022 clnt->msize = clnt->trans_mod->maxsize;
1023 pr_info("Limiting 'msize' to %d as this is the maximum "
1024 "supported by transport %s\n",
1025 clnt->msize, clnt->trans_mod->name
1026 );
1027 }
1028
1029 if (clnt->msize < 4096) {
1030 p9_debug(P9_DEBUG_ERROR,
1031 "Please specify a msize of at least 4k\n");
1032 err = -EINVAL;
1033 goto close_trans;
1034 }
1035
1036 err = p9_client_version(clnt);
1037 if (err)
1038 goto close_trans;
1039
1040 cache_name = kasprintf(GFP_KERNEL,
1041 "9p-fcall-cache-%u", atomic_inc_return(&seqno));
1042 if (!cache_name) {
1043 err = -ENOMEM;
1044 goto close_trans;
1045 }
1046
1047 /* P9_HDRSZ + 4 is the smallest packet header we can have that is
1048 * followed by data accessed from userspace by read
1049 */
1050 clnt->fcall_cache =
1051 kmem_cache_create_usercopy(cache_name, clnt->msize,
1052 0, 0, P9_HDRSZ + 4,
1053 clnt->msize - (P9_HDRSZ + 4),
1054 NULL);
1055
1056 kfree(cache_name);
1057 return clnt;
1058
1059close_trans:
1060 clnt->trans_mod->close(clnt);
1061put_trans:
1062 v9fs_put_trans(clnt->trans_mod);
1063free_client:
1064 kfree(clnt);
1065 return ERR_PTR(err);
1066}
1067EXPORT_SYMBOL(p9_client_create);
1068
1069void p9_client_destroy(struct p9_client *clnt)
1070{
1071 struct p9_fid *fid;
1072 int id;
1073
1074 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1075
1076 if (clnt->trans_mod)
1077 clnt->trans_mod->close(clnt);
1078
1079 v9fs_put_trans(clnt->trans_mod);
1080
1081 idr_for_each_entry(&clnt->fids, fid, id) {
1082 pr_info("Found fid %d not clunked\n", fid->fid);
1083 p9_fid_destroy(fid);
1084 }
1085
1086 p9_tag_cleanup(clnt);
1087
1088 kmem_cache_destroy(clnt->fcall_cache);
1089 kfree(clnt);
1090}
1091EXPORT_SYMBOL(p9_client_destroy);
1092
1093void p9_client_disconnect(struct p9_client *clnt)
1094{
1095 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1096 clnt->status = Disconnected;
1097}
1098EXPORT_SYMBOL(p9_client_disconnect);
1099
1100void p9_client_begin_disconnect(struct p9_client *clnt)
1101{
1102 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1103 clnt->status = BeginDisconnect;
1104}
1105EXPORT_SYMBOL(p9_client_begin_disconnect);
1106
1107struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1108 const char *uname, kuid_t n_uname,
1109 const char *aname)
1110{
1111 int err;
1112 struct p9_req_t *req;
1113 struct p9_fid *fid;
1114 struct p9_qid qid;
1115
1116 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1117 afid ? afid->fid : -1, uname, aname);
1118 fid = p9_fid_create(clnt);
1119 if (!fid) {
1120 err = -ENOMEM;
1121 goto error;
1122 }
1123 fid->uid = n_uname;
1124
1125 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1126 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1127 if (IS_ERR(req)) {
1128 err = PTR_ERR(req);
1129 goto error;
1130 }
1131
1132 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid);
1133 if (err) {
1134 trace_9p_protocol_dump(clnt, &req->rc);
1135 p9_req_put(clnt, req);
1136 goto error;
1137 }
1138
1139 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1140 qid.type, qid.path, qid.version);
1141
1142 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1143
1144 p9_req_put(clnt, req);
1145 return fid;
1146
1147error:
1148 if (fid)
1149 p9_fid_destroy(fid);
1150 return ERR_PTR(err);
1151}
1152EXPORT_SYMBOL(p9_client_attach);
1153
1154struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1155 const unsigned char * const *wnames, int clone)
1156{
1157 int err;
1158 struct p9_client *clnt;
1159 struct p9_fid *fid;
1160 struct p9_qid *wqids;
1161 struct p9_req_t *req;
1162 u16 nwqids, count;
1163
1164 wqids = NULL;
1165 clnt = oldfid->clnt;
1166 if (clone) {
1167 fid = p9_fid_create(clnt);
1168 if (!fid) {
1169 err = -ENOMEM;
1170 goto error;
1171 }
1172
1173 fid->uid = oldfid->uid;
1174 } else {
1175 fid = oldfid;
1176 }
1177
1178 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1179 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1180 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1181 nwname, wnames);
1182 if (IS_ERR(req)) {
1183 err = PTR_ERR(req);
1184 goto error;
1185 }
1186
1187 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1188 if (err) {
1189 trace_9p_protocol_dump(clnt, &req->rc);
1190 p9_req_put(clnt, req);
1191 goto clunk_fid;
1192 }
1193 p9_req_put(clnt, req);
1194
1195 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1196
1197 if (nwqids != nwname) {
1198 err = -ENOENT;
1199 goto clunk_fid;
1200 }
1201
1202 for (count = 0; count < nwqids; count++)
1203 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1204 count, wqids[count].type,
1205 wqids[count].path,
1206 wqids[count].version);
1207
1208 if (nwname)
1209 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1210 else
1211 memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid));
1212
1213 kfree(wqids);
1214 return fid;
1215
1216clunk_fid:
1217 kfree(wqids);
1218 p9_fid_put(fid);
1219 fid = NULL;
1220
1221error:
1222 if (fid && fid != oldfid)
1223 p9_fid_destroy(fid);
1224
1225 return ERR_PTR(err);
1226}
1227EXPORT_SYMBOL(p9_client_walk);
1228
1229int p9_client_open(struct p9_fid *fid, int mode)
1230{
1231 int err;
1232 struct p9_client *clnt;
1233 struct p9_req_t *req;
1234 struct p9_qid qid;
1235 int iounit;
1236
1237 clnt = fid->clnt;
1238 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1239 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1240
1241 if (fid->mode != -1)
1242 return -EINVAL;
1243
1244 if (p9_is_proto_dotl(clnt))
1245 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode & P9L_MODE_MASK);
1246 else
1247 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode & P9L_MODE_MASK);
1248 if (IS_ERR(req)) {
1249 err = PTR_ERR(req);
1250 goto error;
1251 }
1252
1253 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1254 if (err) {
1255 trace_9p_protocol_dump(clnt, &req->rc);
1256 goto free_and_error;
1257 }
1258
1259 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1260 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1261 qid.path, qid.version, iounit);
1262
1263 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1264 fid->mode = mode;
1265 fid->iounit = iounit;
1266
1267free_and_error:
1268 p9_req_put(clnt, req);
1269error:
1270 return err;
1271}
1272EXPORT_SYMBOL(p9_client_open);
1273
1274int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags,
1275 u32 mode, kgid_t gid, struct p9_qid *qid)
1276{
1277 int err;
1278 struct p9_client *clnt;
1279 struct p9_req_t *req;
1280 int iounit;
1281
1282 p9_debug(P9_DEBUG_9P,
1283 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1284 ofid->fid, name, flags, mode,
1285 from_kgid(&init_user_ns, gid));
1286 clnt = ofid->clnt;
1287
1288 if (ofid->mode != -1)
1289 return -EINVAL;
1290
1291 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1292 mode & P9L_MODE_MASK, gid);
1293 if (IS_ERR(req)) {
1294 err = PTR_ERR(req);
1295 goto error;
1296 }
1297
1298 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit);
1299 if (err) {
1300 trace_9p_protocol_dump(clnt, &req->rc);
1301 goto free_and_error;
1302 }
1303
1304 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1305 qid->type, qid->path, qid->version, iounit);
1306
1307 memmove(&ofid->qid, qid, sizeof(struct p9_qid));
1308 ofid->mode = flags;
1309 ofid->iounit = iounit;
1310
1311free_and_error:
1312 p9_req_put(clnt, req);
1313error:
1314 return err;
1315}
1316EXPORT_SYMBOL(p9_client_create_dotl);
1317
1318int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode,
1319 char *extension)
1320{
1321 int err;
1322 struct p9_client *clnt;
1323 struct p9_req_t *req;
1324 struct p9_qid qid;
1325 int iounit;
1326
1327 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1328 fid->fid, name, perm, mode);
1329 clnt = fid->clnt;
1330
1331 if (fid->mode != -1)
1332 return -EINVAL;
1333
1334 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1335 mode & P9L_MODE_MASK, extension);
1336 if (IS_ERR(req)) {
1337 err = PTR_ERR(req);
1338 goto error;
1339 }
1340
1341 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1342 if (err) {
1343 trace_9p_protocol_dump(clnt, &req->rc);
1344 goto free_and_error;
1345 }
1346
1347 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1348 qid.type, qid.path, qid.version, iounit);
1349
1350 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1351 fid->mode = mode;
1352 fid->iounit = iounit;
1353
1354free_and_error:
1355 p9_req_put(clnt, req);
1356error:
1357 return err;
1358}
1359EXPORT_SYMBOL(p9_client_fcreate);
1360
1361int p9_client_symlink(struct p9_fid *dfid, const char *name,
1362 const char *symtgt, kgid_t gid, struct p9_qid *qid)
1363{
1364 int err;
1365 struct p9_client *clnt;
1366 struct p9_req_t *req;
1367
1368 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1369 dfid->fid, name, symtgt);
1370 clnt = dfid->clnt;
1371
1372 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1373 gid);
1374 if (IS_ERR(req)) {
1375 err = PTR_ERR(req);
1376 goto error;
1377 }
1378
1379 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
1380 if (err) {
1381 trace_9p_protocol_dump(clnt, &req->rc);
1382 goto free_and_error;
1383 }
1384
1385 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1386 qid->type, qid->path, qid->version);
1387
1388free_and_error:
1389 p9_req_put(clnt, req);
1390error:
1391 return err;
1392}
1393EXPORT_SYMBOL(p9_client_symlink);
1394
1395int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname)
1396{
1397 struct p9_client *clnt;
1398 struct p9_req_t *req;
1399
1400 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1401 dfid->fid, oldfid->fid, newname);
1402 clnt = dfid->clnt;
1403 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1404 newname);
1405 if (IS_ERR(req))
1406 return PTR_ERR(req);
1407
1408 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1409 p9_req_put(clnt, req);
1410 return 0;
1411}
1412EXPORT_SYMBOL(p9_client_link);
1413
1414int p9_client_fsync(struct p9_fid *fid, int datasync)
1415{
1416 int err = 0;
1417 struct p9_client *clnt;
1418 struct p9_req_t *req;
1419
1420 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1421 fid->fid, datasync);
1422 clnt = fid->clnt;
1423
1424 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1425 if (IS_ERR(req)) {
1426 err = PTR_ERR(req);
1427 goto error;
1428 }
1429
1430 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1431
1432 p9_req_put(clnt, req);
1433
1434error:
1435 return err;
1436}
1437EXPORT_SYMBOL(p9_client_fsync);
1438
1439int p9_client_clunk(struct p9_fid *fid)
1440{
1441 int err = 0;
1442 struct p9_client *clnt;
1443 struct p9_req_t *req;
1444 int retries = 0;
1445
1446again:
1447 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n",
1448 fid->fid, retries);
1449 clnt = fid->clnt;
1450
1451 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1452 if (IS_ERR(req)) {
1453 err = PTR_ERR(req);
1454 goto error;
1455 }
1456
1457 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1458
1459 p9_req_put(clnt, req);
1460error:
1461 /* Fid is not valid even after a failed clunk
1462 * If interrupted, retry once then give up and
1463 * leak fid until umount.
1464 */
1465 if (err == -ERESTARTSYS) {
1466 if (retries++ == 0)
1467 goto again;
1468 } else {
1469 p9_fid_destroy(fid);
1470 }
1471 return err;
1472}
1473EXPORT_SYMBOL(p9_client_clunk);
1474
1475int p9_client_remove(struct p9_fid *fid)
1476{
1477 int err = 0;
1478 struct p9_client *clnt;
1479 struct p9_req_t *req;
1480
1481 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1482 clnt = fid->clnt;
1483
1484 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1485 if (IS_ERR(req)) {
1486 err = PTR_ERR(req);
1487 goto error;
1488 }
1489
1490 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1491
1492 p9_req_put(clnt, req);
1493error:
1494 if (err == -ERESTARTSYS)
1495 p9_fid_put(fid);
1496 else
1497 p9_fid_destroy(fid);
1498 return err;
1499}
1500EXPORT_SYMBOL(p9_client_remove);
1501
1502int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1503{
1504 int err = 0;
1505 struct p9_req_t *req;
1506 struct p9_client *clnt;
1507
1508 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1509 dfid->fid, name, flags);
1510
1511 clnt = dfid->clnt;
1512 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1513 if (IS_ERR(req)) {
1514 err = PTR_ERR(req);
1515 goto error;
1516 }
1517 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1518
1519 p9_req_put(clnt, req);
1520error:
1521 return err;
1522}
1523EXPORT_SYMBOL(p9_client_unlinkat);
1524
1525int
1526p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
1527{
1528 int total = 0;
1529 *err = 0;
1530
1531 while (iov_iter_count(to)) {
1532 int count;
1533
1534 count = p9_client_read_once(fid, offset, to, err);
1535 if (!count || *err)
1536 break;
1537 offset += count;
1538 total += count;
1539 }
1540 return total;
1541}
1542EXPORT_SYMBOL(p9_client_read);
1543
1544int
1545p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to,
1546 int *err)
1547{
1548 struct p9_client *clnt = fid->clnt;
1549 struct p9_req_t *req;
1550 int count = iov_iter_count(to);
1551 int rsize, received, non_zc = 0;
1552 char *dataptr;
1553
1554 *err = 0;
1555 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %zu\n",
1556 fid->fid, offset, iov_iter_count(to));
1557
1558 rsize = fid->iounit;
1559 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ)
1560 rsize = clnt->msize - P9_IOHDRSZ;
1561
1562 if (count < rsize)
1563 rsize = count;
1564
1565 /* Don't bother zerocopy for small IO (< 1024) */
1566 if (clnt->trans_mod->zc_request && rsize > 1024) {
1567 /* response header len is 11
1568 * PDU Header(7) + IO Size (4)
1569 */
1570 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize,
1571 0, 11, "dqd", fid->fid,
1572 offset, rsize);
1573 } else {
1574 non_zc = 1;
1575 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1576 rsize);
1577 }
1578 if (IS_ERR(req)) {
1579 *err = PTR_ERR(req);
1580 if (!non_zc)
1581 iov_iter_revert(to, count - iov_iter_count(to));
1582 return 0;
1583 }
1584
1585 *err = p9pdu_readf(&req->rc, clnt->proto_version,
1586 "D", &received, &dataptr);
1587 if (*err) {
1588 if (!non_zc)
1589 iov_iter_revert(to, count - iov_iter_count(to));
1590 trace_9p_protocol_dump(clnt, &req->rc);
1591 p9_req_put(clnt, req);
1592 return 0;
1593 }
1594 if (rsize < received) {
1595 pr_err("bogus RREAD count (%d > %d)\n", received, rsize);
1596 received = rsize;
1597 }
1598
1599 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", received);
1600
1601 if (non_zc) {
1602 int n = copy_to_iter(dataptr, received, to);
1603
1604 if (n != received) {
1605 *err = -EFAULT;
1606 p9_req_put(clnt, req);
1607 return n;
1608 }
1609 } else {
1610 iov_iter_revert(to, count - received - iov_iter_count(to));
1611 }
1612 p9_req_put(clnt, req);
1613 return received;
1614}
1615EXPORT_SYMBOL(p9_client_read_once);
1616
1617int
1618p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
1619{
1620 struct p9_client *clnt = fid->clnt;
1621 struct p9_req_t *req;
1622 int total = 0;
1623 *err = 0;
1624
1625 while (iov_iter_count(from)) {
1626 int count = iov_iter_count(from);
1627 int rsize = fid->iounit;
1628 int written;
1629
1630 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ)
1631 rsize = clnt->msize - P9_IOHDRSZ;
1632
1633 if (count < rsize)
1634 rsize = count;
1635
1636 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d (/%d)\n",
1637 fid->fid, offset, rsize, count);
1638
1639 /* Don't bother zerocopy for small IO (< 1024) */
1640 if (clnt->trans_mod->zc_request && rsize > 1024) {
1641 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0,
1642 rsize, P9_ZC_HDR_SZ, "dqd",
1643 fid->fid, offset, rsize);
1644 } else {
1645 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
1646 offset, rsize, from);
1647 }
1648 if (IS_ERR(req)) {
1649 iov_iter_revert(from, count - iov_iter_count(from));
1650 *err = PTR_ERR(req);
1651 break;
1652 }
1653
1654 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &written);
1655 if (*err) {
1656 iov_iter_revert(from, count - iov_iter_count(from));
1657 trace_9p_protocol_dump(clnt, &req->rc);
1658 p9_req_put(clnt, req);
1659 break;
1660 }
1661 if (rsize < written) {
1662 pr_err("bogus RWRITE count (%d > %d)\n", written, rsize);
1663 written = rsize;
1664 }
1665
1666 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", written);
1667
1668 p9_req_put(clnt, req);
1669 iov_iter_revert(from, count - written - iov_iter_count(from));
1670 total += written;
1671 offset += written;
1672 }
1673 return total;
1674}
1675EXPORT_SYMBOL(p9_client_write);
1676
1677void
1678p9_client_write_subreq(struct netfs_io_subrequest *subreq)
1679{
1680 struct netfs_io_request *wreq = subreq->rreq;
1681 struct p9_fid *fid = wreq->netfs_priv;
1682 struct p9_client *clnt = fid->clnt;
1683 struct p9_req_t *req;
1684 unsigned long long start = subreq->start + subreq->transferred;
1685 int written, len = subreq->len - subreq->transferred;
1686 int err;
1687
1688 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu len %d\n",
1689 fid->fid, start, len);
1690
1691 /* Don't bother zerocopy for small IO (< 1024) */
1692 if (clnt->trans_mod->zc_request && len > 1024) {
1693 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, &subreq->io_iter,
1694 0, wreq->len, P9_ZC_HDR_SZ, "dqd",
1695 fid->fid, start, len);
1696 } else {
1697 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
1698 start, len, &subreq->io_iter);
1699 }
1700 if (IS_ERR(req)) {
1701 netfs_write_subrequest_terminated(subreq, PTR_ERR(req), false);
1702 return;
1703 }
1704
1705 err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &written);
1706 if (err) {
1707 trace_9p_protocol_dump(clnt, &req->rc);
1708 p9_req_put(clnt, req);
1709 netfs_write_subrequest_terminated(subreq, err, false);
1710 return;
1711 }
1712
1713 if (written > len) {
1714 pr_err("bogus RWRITE count (%d > %u)\n", written, len);
1715 written = len;
1716 }
1717
1718 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", len);
1719
1720 p9_req_put(clnt, req);
1721 netfs_write_subrequest_terminated(subreq, written, false);
1722}
1723EXPORT_SYMBOL(p9_client_write_subreq);
1724
1725struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1726{
1727 int err;
1728 struct p9_client *clnt;
1729 struct p9_wstat *ret;
1730 struct p9_req_t *req;
1731 u16 ignored;
1732
1733 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1734
1735 ret = kmalloc(sizeof(*ret), GFP_KERNEL);
1736 if (!ret)
1737 return ERR_PTR(-ENOMEM);
1738
1739 clnt = fid->clnt;
1740
1741 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1742 if (IS_ERR(req)) {
1743 err = PTR_ERR(req);
1744 goto error;
1745 }
1746
1747 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret);
1748 if (err) {
1749 trace_9p_protocol_dump(clnt, &req->rc);
1750 p9_req_put(clnt, req);
1751 goto error;
1752 }
1753
1754 p9_debug(P9_DEBUG_9P,
1755 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1756 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1757 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1758 "<<< uid=%d gid=%d n_muid=%d\n",
1759 ret->size, ret->type, ret->dev, ret->qid.type, ret->qid.path,
1760 ret->qid.version, ret->mode,
1761 ret->atime, ret->mtime, ret->length,
1762 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1763 from_kuid(&init_user_ns, ret->n_uid),
1764 from_kgid(&init_user_ns, ret->n_gid),
1765 from_kuid(&init_user_ns, ret->n_muid));
1766
1767 p9_req_put(clnt, req);
1768 return ret;
1769
1770error:
1771 kfree(ret);
1772 return ERR_PTR(err);
1773}
1774EXPORT_SYMBOL(p9_client_stat);
1775
1776struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1777 u64 request_mask)
1778{
1779 int err;
1780 struct p9_client *clnt;
1781 struct p9_stat_dotl *ret;
1782 struct p9_req_t *req;
1783
1784 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1785 fid->fid, request_mask);
1786
1787 ret = kmalloc(sizeof(*ret), GFP_KERNEL);
1788 if (!ret)
1789 return ERR_PTR(-ENOMEM);
1790
1791 clnt = fid->clnt;
1792
1793 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1794 if (IS_ERR(req)) {
1795 err = PTR_ERR(req);
1796 goto error;
1797 }
1798
1799 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret);
1800 if (err) {
1801 trace_9p_protocol_dump(clnt, &req->rc);
1802 p9_req_put(clnt, req);
1803 goto error;
1804 }
1805
1806 p9_debug(P9_DEBUG_9P, "<<< RGETATTR st_result_mask=%lld\n"
1807 "<<< qid=%x.%llx.%x\n"
1808 "<<< st_mode=%8.8x st_nlink=%llu\n"
1809 "<<< st_uid=%d st_gid=%d\n"
1810 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1811 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1812 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1813 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1814 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1815 "<<< st_gen=%lld st_data_version=%lld\n",
1816 ret->st_result_mask,
1817 ret->qid.type, ret->qid.path, ret->qid.version,
1818 ret->st_mode, ret->st_nlink,
1819 from_kuid(&init_user_ns, ret->st_uid),
1820 from_kgid(&init_user_ns, ret->st_gid),
1821 ret->st_rdev, ret->st_size, ret->st_blksize, ret->st_blocks,
1822 ret->st_atime_sec, ret->st_atime_nsec,
1823 ret->st_mtime_sec, ret->st_mtime_nsec,
1824 ret->st_ctime_sec, ret->st_ctime_nsec,
1825 ret->st_btime_sec, ret->st_btime_nsec,
1826 ret->st_gen, ret->st_data_version);
1827
1828 p9_req_put(clnt, req);
1829 return ret;
1830
1831error:
1832 kfree(ret);
1833 return ERR_PTR(err);
1834}
1835EXPORT_SYMBOL(p9_client_getattr_dotl);
1836
1837static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1838{
1839 int ret;
1840
1841 /* NOTE: size shouldn't include its own length */
1842 /* size[2] type[2] dev[4] qid[13] */
1843 /* mode[4] atime[4] mtime[4] length[8]*/
1844 /* name[s] uid[s] gid[s] muid[s] */
1845 ret = 2 + 4 + 13 + 4 + 4 + 4 + 8 + 2 + 2 + 2 + 2;
1846
1847 if (wst->name)
1848 ret += strlen(wst->name);
1849 if (wst->uid)
1850 ret += strlen(wst->uid);
1851 if (wst->gid)
1852 ret += strlen(wst->gid);
1853 if (wst->muid)
1854 ret += strlen(wst->muid);
1855
1856 if (proto_version == p9_proto_2000u ||
1857 proto_version == p9_proto_2000L) {
1858 /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1859 ret += 2 + 4 + 4 + 4;
1860 if (wst->extension)
1861 ret += strlen(wst->extension);
1862 }
1863
1864 return ret;
1865}
1866
1867int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1868{
1869 int err = 0;
1870 struct p9_req_t *req;
1871 struct p9_client *clnt;
1872
1873 clnt = fid->clnt;
1874 wst->size = p9_client_statsize(wst, clnt->proto_version);
1875 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n",
1876 fid->fid);
1877 p9_debug(P9_DEBUG_9P,
1878 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1879 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1880 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1881 " uid=%d gid=%d n_muid=%d\n",
1882 wst->size, wst->type, wst->dev, wst->qid.type,
1883 wst->qid.path, wst->qid.version,
1884 wst->mode, wst->atime, wst->mtime, wst->length,
1885 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1886 from_kuid(&init_user_ns, wst->n_uid),
1887 from_kgid(&init_user_ns, wst->n_gid),
1888 from_kuid(&init_user_ns, wst->n_muid));
1889
1890 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS",
1891 fid->fid, wst->size + 2, wst);
1892 if (IS_ERR(req)) {
1893 err = PTR_ERR(req);
1894 goto error;
1895 }
1896
1897 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1898
1899 p9_req_put(clnt, req);
1900error:
1901 return err;
1902}
1903EXPORT_SYMBOL(p9_client_wstat);
1904
1905int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1906{
1907 int err = 0;
1908 struct p9_req_t *req;
1909 struct p9_client *clnt;
1910
1911 clnt = fid->clnt;
1912 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1913 p9_debug(P9_DEBUG_9P, " valid=%x mode=%x uid=%d gid=%d size=%lld\n",
1914 p9attr->valid, p9attr->mode,
1915 from_kuid(&init_user_ns, p9attr->uid),
1916 from_kgid(&init_user_ns, p9attr->gid),
1917 p9attr->size);
1918 p9_debug(P9_DEBUG_9P, " atime_sec=%lld atime_nsec=%lld\n",
1919 p9attr->atime_sec, p9attr->atime_nsec);
1920 p9_debug(P9_DEBUG_9P, " mtime_sec=%lld mtime_nsec=%lld\n",
1921 p9attr->mtime_sec, p9attr->mtime_nsec);
1922
1923 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1924
1925 if (IS_ERR(req)) {
1926 err = PTR_ERR(req);
1927 goto error;
1928 }
1929 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1930 p9_req_put(clnt, req);
1931error:
1932 return err;
1933}
1934EXPORT_SYMBOL(p9_client_setattr);
1935
1936int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1937{
1938 int err;
1939 struct p9_req_t *req;
1940 struct p9_client *clnt;
1941
1942 clnt = fid->clnt;
1943
1944 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1945
1946 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1947 if (IS_ERR(req)) {
1948 err = PTR_ERR(req);
1949 goto error;
1950 }
1951
1952 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1953 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1954 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1955 if (err) {
1956 trace_9p_protocol_dump(clnt, &req->rc);
1957 p9_req_put(clnt, req);
1958 goto error;
1959 }
1960
1961 p9_debug(P9_DEBUG_9P,
1962 "<<< RSTATFS fid %d type 0x%x bsize %u blocks %llu bfree %llu bavail %llu files %llu ffree %llu fsid %llu namelen %u\n",
1963 fid->fid, sb->type, sb->bsize, sb->blocks, sb->bfree,
1964 sb->bavail, sb->files, sb->ffree, sb->fsid, sb->namelen);
1965
1966 p9_req_put(clnt, req);
1967error:
1968 return err;
1969}
1970EXPORT_SYMBOL(p9_client_statfs);
1971
1972int p9_client_rename(struct p9_fid *fid,
1973 struct p9_fid *newdirfid, const char *name)
1974{
1975 int err = 0;
1976 struct p9_req_t *req;
1977 struct p9_client *clnt;
1978
1979 clnt = fid->clnt;
1980
1981 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1982 fid->fid, newdirfid->fid, name);
1983
1984 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1985 newdirfid->fid, name);
1986 if (IS_ERR(req)) {
1987 err = PTR_ERR(req);
1988 goto error;
1989 }
1990
1991 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1992
1993 p9_req_put(clnt, req);
1994error:
1995 return err;
1996}
1997EXPORT_SYMBOL(p9_client_rename);
1998
1999int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
2000 struct p9_fid *newdirfid, const char *new_name)
2001{
2002 int err = 0;
2003 struct p9_req_t *req;
2004 struct p9_client *clnt;
2005
2006 clnt = olddirfid->clnt;
2007
2008 p9_debug(P9_DEBUG_9P,
2009 ">>> TRENAMEAT olddirfid %d old name %s newdirfid %d new name %s\n",
2010 olddirfid->fid, old_name, newdirfid->fid, new_name);
2011
2012 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
2013 old_name, newdirfid->fid, new_name);
2014 if (IS_ERR(req)) {
2015 err = PTR_ERR(req);
2016 goto error;
2017 }
2018
2019 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
2020 newdirfid->fid, new_name);
2021
2022 p9_req_put(clnt, req);
2023error:
2024 return err;
2025}
2026EXPORT_SYMBOL(p9_client_renameat);
2027
2028/* An xattrwalk without @attr_name gives the fid for the lisxattr namespace
2029 */
2030struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
2031 const char *attr_name, u64 *attr_size)
2032{
2033 int err;
2034 struct p9_req_t *req;
2035 struct p9_client *clnt;
2036 struct p9_fid *attr_fid;
2037
2038 clnt = file_fid->clnt;
2039 attr_fid = p9_fid_create(clnt);
2040 if (!attr_fid) {
2041 err = -ENOMEM;
2042 goto error;
2043 }
2044 p9_debug(P9_DEBUG_9P,
2045 ">>> TXATTRWALK file_fid %d, attr_fid %d name '%s'\n",
2046 file_fid->fid, attr_fid->fid, attr_name);
2047
2048 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
2049 file_fid->fid, attr_fid->fid, attr_name);
2050 if (IS_ERR(req)) {
2051 err = PTR_ERR(req);
2052 goto error;
2053 }
2054 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size);
2055 if (err) {
2056 trace_9p_protocol_dump(clnt, &req->rc);
2057 p9_req_put(clnt, req);
2058 goto clunk_fid;
2059 }
2060 p9_req_put(clnt, req);
2061 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2062 attr_fid->fid, *attr_size);
2063 return attr_fid;
2064clunk_fid:
2065 p9_fid_put(attr_fid);
2066 attr_fid = NULL;
2067error:
2068 if (attr_fid && attr_fid != file_fid)
2069 p9_fid_destroy(attr_fid);
2070
2071 return ERR_PTR(err);
2072}
2073EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2074
2075int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2076 u64 attr_size, int flags)
2077{
2078 int err = 0;
2079 struct p9_req_t *req;
2080 struct p9_client *clnt;
2081
2082 p9_debug(P9_DEBUG_9P,
2083 ">>> TXATTRCREATE fid %d name %s size %llu flag %d\n",
2084 fid->fid, name, attr_size, flags);
2085 clnt = fid->clnt;
2086 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2087 fid->fid, name, attr_size, flags);
2088 if (IS_ERR(req)) {
2089 err = PTR_ERR(req);
2090 goto error;
2091 }
2092 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2093 p9_req_put(clnt, req);
2094error:
2095 return err;
2096}
2097EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2098
2099int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2100{
2101 int err, rsize, non_zc = 0;
2102 struct p9_client *clnt;
2103 struct p9_req_t *req;
2104 char *dataptr;
2105 struct kvec kv = {.iov_base = data, .iov_len = count};
2106 struct iov_iter to;
2107
2108 iov_iter_kvec(&to, ITER_DEST, &kv, 1, count);
2109
2110 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2111 fid->fid, offset, count);
2112
2113 clnt = fid->clnt;
2114
2115 rsize = fid->iounit;
2116 if (!rsize || rsize > clnt->msize - P9_READDIRHDRSZ)
2117 rsize = clnt->msize - P9_READDIRHDRSZ;
2118
2119 if (count < rsize)
2120 rsize = count;
2121
2122 /* Don't bother zerocopy for small IO (< 1024) */
2123 if (clnt->trans_mod->zc_request && rsize > 1024) {
2124 /* response header len is 11
2125 * PDU Header(7) + IO Size (4)
2126 */
2127 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0,
2128 11, "dqd", fid->fid, offset, rsize);
2129 } else {
2130 non_zc = 1;
2131 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2132 offset, rsize);
2133 }
2134 if (IS_ERR(req)) {
2135 err = PTR_ERR(req);
2136 goto error;
2137 }
2138
2139 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr);
2140 if (err) {
2141 trace_9p_protocol_dump(clnt, &req->rc);
2142 goto free_and_error;
2143 }
2144 if (rsize < count) {
2145 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize);
2146 count = rsize;
2147 }
2148
2149 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2150
2151 if (non_zc)
2152 memmove(data, dataptr, count);
2153
2154 p9_req_put(clnt, req);
2155 return count;
2156
2157free_and_error:
2158 p9_req_put(clnt, req);
2159error:
2160 return err;
2161}
2162EXPORT_SYMBOL(p9_client_readdir);
2163
2164int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode,
2165 dev_t rdev, kgid_t gid, struct p9_qid *qid)
2166{
2167 int err;
2168 struct p9_client *clnt;
2169 struct p9_req_t *req;
2170
2171 clnt = fid->clnt;
2172 p9_debug(P9_DEBUG_9P,
2173 ">>> TMKNOD fid %d name %s mode %d major %d minor %d\n",
2174 fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2175 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2176 MAJOR(rdev), MINOR(rdev), gid);
2177 if (IS_ERR(req))
2178 return PTR_ERR(req);
2179
2180 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
2181 if (err) {
2182 trace_9p_protocol_dump(clnt, &req->rc);
2183 goto error;
2184 }
2185 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n",
2186 qid->type, qid->path, qid->version);
2187
2188error:
2189 p9_req_put(clnt, req);
2190 return err;
2191}
2192EXPORT_SYMBOL(p9_client_mknod_dotl);
2193
2194int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode,
2195 kgid_t gid, struct p9_qid *qid)
2196{
2197 int err;
2198 struct p9_client *clnt;
2199 struct p9_req_t *req;
2200
2201 clnt = fid->clnt;
2202 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2203 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2204 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg",
2205 fid->fid, name, mode, gid);
2206 if (IS_ERR(req))
2207 return PTR_ERR(req);
2208
2209 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
2210 if (err) {
2211 trace_9p_protocol_dump(clnt, &req->rc);
2212 goto error;
2213 }
2214 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2215 qid->path, qid->version);
2216
2217error:
2218 p9_req_put(clnt, req);
2219 return err;
2220}
2221EXPORT_SYMBOL(p9_client_mkdir_dotl);
2222
2223int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2224{
2225 int err;
2226 struct p9_client *clnt;
2227 struct p9_req_t *req;
2228
2229 clnt = fid->clnt;
2230 p9_debug(P9_DEBUG_9P,
2231 ">>> TLOCK fid %d type %i flags %d start %lld length %lld proc_id %d client_id %s\n",
2232 fid->fid, flock->type, flock->flags, flock->start,
2233 flock->length, flock->proc_id, flock->client_id);
2234
2235 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2236 flock->flags, flock->start, flock->length,
2237 flock->proc_id, flock->client_id);
2238
2239 if (IS_ERR(req))
2240 return PTR_ERR(req);
2241
2242 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status);
2243 if (err) {
2244 trace_9p_protocol_dump(clnt, &req->rc);
2245 goto error;
2246 }
2247 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2248error:
2249 p9_req_put(clnt, req);
2250 return err;
2251}
2252EXPORT_SYMBOL(p9_client_lock_dotl);
2253
2254int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2255{
2256 int err;
2257 struct p9_client *clnt;
2258 struct p9_req_t *req;
2259
2260 clnt = fid->clnt;
2261 p9_debug(P9_DEBUG_9P,
2262 ">>> TGETLOCK fid %d, type %i start %lld length %lld proc_id %d client_id %s\n",
2263 fid->fid, glock->type, glock->start, glock->length,
2264 glock->proc_id, glock->client_id);
2265
2266 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid,
2267 glock->type, glock->start, glock->length,
2268 glock->proc_id, glock->client_id);
2269
2270 if (IS_ERR(req))
2271 return PTR_ERR(req);
2272
2273 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type,
2274 &glock->start, &glock->length, &glock->proc_id,
2275 &glock->client_id);
2276 if (err) {
2277 trace_9p_protocol_dump(clnt, &req->rc);
2278 goto error;
2279 }
2280 p9_debug(P9_DEBUG_9P,
2281 "<<< RGETLOCK type %i start %lld length %lld proc_id %d client_id %s\n",
2282 glock->type, glock->start, glock->length,
2283 glock->proc_id, glock->client_id);
2284error:
2285 p9_req_put(clnt, req);
2286 return err;
2287}
2288EXPORT_SYMBOL(p9_client_getlock_dotl);
2289
2290int p9_client_readlink(struct p9_fid *fid, char **target)
2291{
2292 int err;
2293 struct p9_client *clnt;
2294 struct p9_req_t *req;
2295
2296 clnt = fid->clnt;
2297 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2298
2299 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2300 if (IS_ERR(req))
2301 return PTR_ERR(req);
2302
2303 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target);
2304 if (err) {
2305 trace_9p_protocol_dump(clnt, &req->rc);
2306 goto error;
2307 }
2308 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2309error:
2310 p9_req_put(clnt, req);
2311 return err;
2312}
2313EXPORT_SYMBOL(p9_client_readlink);
2314
2315int __init p9_client_init(void)
2316{
2317 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU);
2318 return p9_req_cache ? 0 : -ENOMEM;
2319}
2320
2321void __exit p9_client_exit(void)
2322{
2323 kmem_cache_destroy(p9_req_cache);
2324}