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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#include <linux/module.h>
27#include <linux/errno.h>
28#include <linux/fs.h>
29#include <linux/poll.h>
30#include <linux/idr.h>
31#include <linux/mutex.h>
32#include <linux/slab.h>
33#include <linux/sched.h>
34#include <linux/uaccess.h>
35#include <net/9p/9p.h>
36#include <linux/parser.h>
37#include <net/9p/client.h>
38#include <net/9p/transport.h>
39#include "protocol.h"
40
41/*
42 * Client Option Parsing (code inspired by NFS code)
43 * - a little lazy - parse all client options
44 */
45
46enum {
47 Opt_msize,
48 Opt_trans,
49 Opt_legacy,
50 Opt_version,
51 Opt_err,
52};
53
54static const match_table_t tokens = {
55 {Opt_msize, "msize=%u"},
56 {Opt_legacy, "noextend"},
57 {Opt_trans, "trans=%s"},
58 {Opt_version, "version=%s"},
59 {Opt_err, NULL},
60};
61
62inline int p9_is_proto_dotl(struct p9_client *clnt)
63{
64 return clnt->proto_version == p9_proto_2000L;
65}
66EXPORT_SYMBOL(p9_is_proto_dotl);
67
68inline int p9_is_proto_dotu(struct p9_client *clnt)
69{
70 return clnt->proto_version == p9_proto_2000u;
71}
72EXPORT_SYMBOL(p9_is_proto_dotu);
73
74/* Interpret mount option for protocol version */
75static int get_protocol_version(char *s)
76{
77 int version = -EINVAL;
78
79 if (!strcmp(s, "9p2000")) {
80 version = p9_proto_legacy;
81 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: Legacy\n");
82 } else if (!strcmp(s, "9p2000.u")) {
83 version = p9_proto_2000u;
84 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
85 } else if (!strcmp(s, "9p2000.L")) {
86 version = p9_proto_2000L;
87 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
88 } else
89 printk(KERN_INFO "9p: Unknown protocol version %s.\n", s);
90
91 return version;
92}
93
94/**
95 * parse_options - parse mount options into client structure
96 * @opts: options string passed from mount
97 * @clnt: existing v9fs client information
98 *
99 * Return 0 upon success, -ERRNO upon failure
100 */
101
102static int parse_opts(char *opts, struct p9_client *clnt)
103{
104 char *options, *tmp_options;
105 char *p;
106 substring_t args[MAX_OPT_ARGS];
107 int option;
108 char *s;
109 int ret = 0;
110
111 clnt->proto_version = p9_proto_2000u;
112 clnt->msize = 8192;
113
114 if (!opts)
115 return 0;
116
117 tmp_options = kstrdup(opts, GFP_KERNEL);
118 if (!tmp_options) {
119 P9_DPRINTK(P9_DEBUG_ERROR,
120 "failed to allocate copy of option string\n");
121 return -ENOMEM;
122 }
123 options = tmp_options;
124
125 while ((p = strsep(&options, ",")) != NULL) {
126 int token;
127 if (!*p)
128 continue;
129 token = match_token(p, tokens, args);
130 if (token < Opt_trans) {
131 int r = match_int(&args[0], &option);
132 if (r < 0) {
133 P9_DPRINTK(P9_DEBUG_ERROR,
134 "integer field, but no integer?\n");
135 ret = r;
136 continue;
137 }
138 }
139 switch (token) {
140 case Opt_msize:
141 clnt->msize = option;
142 break;
143 case Opt_trans:
144 s = match_strdup(&args[0]);
145 if (!s) {
146 ret = -ENOMEM;
147 P9_DPRINTK(P9_DEBUG_ERROR,
148 "problem allocating copy of trans arg\n");
149 goto free_and_return;
150 }
151 clnt->trans_mod = v9fs_get_trans_by_name(s);
152 if (clnt->trans_mod == NULL) {
153 printk(KERN_INFO
154 "9p: Could not find "
155 "request transport: %s\n", s);
156 ret = -EINVAL;
157 kfree(s);
158 goto free_and_return;
159 }
160 kfree(s);
161 break;
162 case Opt_legacy:
163 clnt->proto_version = p9_proto_legacy;
164 break;
165 case Opt_version:
166 s = match_strdup(&args[0]);
167 if (!s) {
168 ret = -ENOMEM;
169 P9_DPRINTK(P9_DEBUG_ERROR,
170 "problem allocating copy of version arg\n");
171 goto free_and_return;
172 }
173 ret = get_protocol_version(s);
174 if (ret == -EINVAL) {
175 kfree(s);
176 goto free_and_return;
177 }
178 kfree(s);
179 clnt->proto_version = ret;
180 break;
181 default:
182 continue;
183 }
184 }
185
186free_and_return:
187 kfree(tmp_options);
188 return ret;
189}
190
191/**
192 * p9_tag_alloc - lookup/allocate a request by tag
193 * @c: client session to lookup tag within
194 * @tag: numeric id for transaction
195 *
196 * this is a simple array lookup, but will grow the
197 * request_slots as necessary to accommodate transaction
198 * ids which did not previously have a slot.
199 *
200 * this code relies on the client spinlock to manage locks, its
201 * possible we should switch to something else, but I'd rather
202 * stick with something low-overhead for the common case.
203 *
204 */
205
206static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag)
207{
208 unsigned long flags;
209 int row, col;
210 struct p9_req_t *req;
211
212 /* This looks up the original request by tag so we know which
213 * buffer to read the data into */
214 tag++;
215
216 if (tag >= c->max_tag) {
217 spin_lock_irqsave(&c->lock, flags);
218 /* check again since original check was outside of lock */
219 while (tag >= c->max_tag) {
220 row = (tag / P9_ROW_MAXTAG);
221 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
222 sizeof(struct p9_req_t), GFP_ATOMIC);
223
224 if (!c->reqs[row]) {
225 printk(KERN_ERR "Couldn't grow tag array\n");
226 spin_unlock_irqrestore(&c->lock, flags);
227 return ERR_PTR(-ENOMEM);
228 }
229 for (col = 0; col < P9_ROW_MAXTAG; col++) {
230 c->reqs[row][col].status = REQ_STATUS_IDLE;
231 c->reqs[row][col].tc = NULL;
232 }
233 c->max_tag += P9_ROW_MAXTAG;
234 }
235 spin_unlock_irqrestore(&c->lock, flags);
236 }
237 row = tag / P9_ROW_MAXTAG;
238 col = tag % P9_ROW_MAXTAG;
239
240 req = &c->reqs[row][col];
241 if (!req->tc) {
242 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
243 if (!req->wq) {
244 printk(KERN_ERR "Couldn't grow tag array\n");
245 return ERR_PTR(-ENOMEM);
246 }
247 init_waitqueue_head(req->wq);
248 if ((c->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
249 P9_TRANS_PREF_PAYLOAD_SEP) {
250 int alloc_msize = min(c->msize, 4096);
251 req->tc = kmalloc(sizeof(struct p9_fcall)+alloc_msize,
252 GFP_NOFS);
253 req->tc->capacity = alloc_msize;
254 req->rc = kmalloc(sizeof(struct p9_fcall)+alloc_msize,
255 GFP_NOFS);
256 req->rc->capacity = alloc_msize;
257 } else {
258 req->tc = kmalloc(sizeof(struct p9_fcall)+c->msize,
259 GFP_NOFS);
260 req->tc->capacity = c->msize;
261 req->rc = kmalloc(sizeof(struct p9_fcall)+c->msize,
262 GFP_NOFS);
263 req->rc->capacity = c->msize;
264 }
265 if ((!req->tc) || (!req->rc)) {
266 printk(KERN_ERR "Couldn't grow tag array\n");
267 kfree(req->tc);
268 kfree(req->rc);
269 kfree(req->wq);
270 req->tc = req->rc = NULL;
271 req->wq = NULL;
272 return ERR_PTR(-ENOMEM);
273 }
274 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
275 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
276 }
277
278 p9pdu_reset(req->tc);
279 p9pdu_reset(req->rc);
280
281 req->tc->tag = tag-1;
282 req->status = REQ_STATUS_ALLOC;
283
284 return &c->reqs[row][col];
285}
286
287/**
288 * p9_tag_lookup - lookup a request by tag
289 * @c: client session to lookup tag within
290 * @tag: numeric id for transaction
291 *
292 */
293
294struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
295{
296 int row, col;
297
298 /* This looks up the original request by tag so we know which
299 * buffer to read the data into */
300 tag++;
301
302 if(tag >= c->max_tag)
303 return NULL;
304
305 row = tag / P9_ROW_MAXTAG;
306 col = tag % P9_ROW_MAXTAG;
307
308 return &c->reqs[row][col];
309}
310EXPORT_SYMBOL(p9_tag_lookup);
311
312/**
313 * p9_tag_init - setup tags structure and contents
314 * @c: v9fs client struct
315 *
316 * This initializes the tags structure for each client instance.
317 *
318 */
319
320static int p9_tag_init(struct p9_client *c)
321{
322 int err = 0;
323
324 c->tagpool = p9_idpool_create();
325 if (IS_ERR(c->tagpool)) {
326 err = PTR_ERR(c->tagpool);
327 goto error;
328 }
329 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
330 if (err < 0) {
331 p9_idpool_destroy(c->tagpool);
332 goto error;
333 }
334 c->max_tag = 0;
335error:
336 return err;
337}
338
339/**
340 * p9_tag_cleanup - cleans up tags structure and reclaims resources
341 * @c: v9fs client struct
342 *
343 * This frees resources associated with the tags structure
344 *
345 */
346static void p9_tag_cleanup(struct p9_client *c)
347{
348 int row, col;
349
350 /* check to insure all requests are idle */
351 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
352 for (col = 0; col < P9_ROW_MAXTAG; col++) {
353 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
354 P9_DPRINTK(P9_DEBUG_MUX,
355 "Attempting to cleanup non-free tag %d,%d\n",
356 row, col);
357 /* TODO: delay execution of cleanup */
358 return;
359 }
360 }
361 }
362
363 if (c->tagpool) {
364 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
365 p9_idpool_destroy(c->tagpool);
366 }
367
368 /* free requests associated with tags */
369 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
370 for (col = 0; col < P9_ROW_MAXTAG; col++) {
371 kfree(c->reqs[row][col].wq);
372 kfree(c->reqs[row][col].tc);
373 kfree(c->reqs[row][col].rc);
374 }
375 kfree(c->reqs[row]);
376 }
377 c->max_tag = 0;
378}
379
380/**
381 * p9_free_req - free a request and clean-up as necessary
382 * c: client state
383 * r: request to release
384 *
385 */
386
387static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
388{
389 int tag = r->tc->tag;
390 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
391
392 r->status = REQ_STATUS_IDLE;
393 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
394 p9_idpool_put(tag, c->tagpool);
395}
396
397/**
398 * p9_client_cb - call back from transport to client
399 * c: client state
400 * req: request received
401 *
402 */
403void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
404{
405 P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
406 wake_up(req->wq);
407 P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
408}
409EXPORT_SYMBOL(p9_client_cb);
410
411/**
412 * p9_parse_header - parse header arguments out of a packet
413 * @pdu: packet to parse
414 * @size: size of packet
415 * @type: type of request
416 * @tag: tag of packet
417 * @rewind: set if we need to rewind offset afterwards
418 */
419
420int
421p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
422 int rewind)
423{
424 int8_t r_type;
425 int16_t r_tag;
426 int32_t r_size;
427 int offset = pdu->offset;
428 int err;
429
430 pdu->offset = 0;
431 if (pdu->size == 0)
432 pdu->size = 7;
433
434 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
435 if (err)
436 goto rewind_and_exit;
437
438 pdu->size = r_size;
439 pdu->id = r_type;
440 pdu->tag = r_tag;
441
442 P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size,
443 pdu->id, pdu->tag);
444
445 if (type)
446 *type = r_type;
447 if (tag)
448 *tag = r_tag;
449 if (size)
450 *size = r_size;
451
452
453rewind_and_exit:
454 if (rewind)
455 pdu->offset = offset;
456 return err;
457}
458EXPORT_SYMBOL(p9_parse_header);
459
460/**
461 * p9_check_errors - check 9p packet for error return and process it
462 * @c: current client instance
463 * @req: request to parse and check for error conditions
464 *
465 * returns error code if one is discovered, otherwise returns 0
466 *
467 * this will have to be more complicated if we have multiple
468 * error packet types
469 */
470
471static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
472{
473 int8_t type;
474 int err;
475 int ecode;
476
477 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
478 if (err) {
479 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
480 return err;
481 }
482
483 if (type != P9_RERROR && type != P9_RLERROR)
484 return 0;
485
486 if (!p9_is_proto_dotl(c)) {
487 char *ename;
488
489 if (req->tc->pbuf_size) {
490 /* Handle user buffers */
491 size_t len = req->rc->size - req->rc->offset;
492 if (req->tc->pubuf) {
493 /* User Buffer */
494 err = copy_from_user(
495 &req->rc->sdata[req->rc->offset],
496 req->tc->pubuf, len);
497 if (err) {
498 err = -EFAULT;
499 goto out_err;
500 }
501 } else {
502 /* Kernel Buffer */
503 memmove(&req->rc->sdata[req->rc->offset],
504 req->tc->pkbuf, len);
505 }
506 }
507 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
508 &ename, &ecode);
509 if (err)
510 goto out_err;
511
512 if (p9_is_proto_dotu(c))
513 err = -ecode;
514
515 if (!err || !IS_ERR_VALUE(err)) {
516 err = p9_errstr2errno(ename, strlen(ename));
517
518 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode,
519 ename);
520
521 kfree(ename);
522 }
523 } else {
524 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
525 err = -ecode;
526
527 P9_DPRINTK(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
528 }
529
530
531 return err;
532
533out_err:
534 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
535
536 return err;
537}
538
539static struct p9_req_t *
540p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
541
542/**
543 * p9_client_flush - flush (cancel) a request
544 * @c: client state
545 * @oldreq: request to cancel
546 *
547 * This sents a flush for a particular request and links
548 * the flush request to the original request. The current
549 * code only supports a single flush request although the protocol
550 * allows for multiple flush requests to be sent for a single request.
551 *
552 */
553
554static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
555{
556 struct p9_req_t *req;
557 int16_t oldtag;
558 int err;
559
560 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
561 if (err)
562 return err;
563
564 P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
565
566 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
567 if (IS_ERR(req))
568 return PTR_ERR(req);
569
570
571 /* if we haven't received a response for oldreq,
572 remove it from the list. */
573 spin_lock(&c->lock);
574 if (oldreq->status == REQ_STATUS_FLSH)
575 list_del(&oldreq->req_list);
576 spin_unlock(&c->lock);
577
578 p9_free_req(c, req);
579 return 0;
580}
581
582/**
583 * p9_client_rpc - issue a request and wait for a response
584 * @c: client session
585 * @type: type of request
586 * @fmt: protocol format string (see protocol.c)
587 *
588 * Returns request structure (which client must free using p9_free_req)
589 */
590
591static struct p9_req_t *
592p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
593{
594 va_list ap;
595 int tag, err;
596 struct p9_req_t *req;
597 unsigned long flags;
598 int sigpending;
599
600 P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
601
602 /* we allow for any status other than disconnected */
603 if (c->status == Disconnected)
604 return ERR_PTR(-EIO);
605
606 /* if status is begin_disconnected we allow only clunk request */
607 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
608 return ERR_PTR(-EIO);
609
610 if (signal_pending(current)) {
611 sigpending = 1;
612 clear_thread_flag(TIF_SIGPENDING);
613 } else
614 sigpending = 0;
615
616 tag = P9_NOTAG;
617 if (type != P9_TVERSION) {
618 tag = p9_idpool_get(c->tagpool);
619 if (tag < 0)
620 return ERR_PTR(-ENOMEM);
621 }
622
623 req = p9_tag_alloc(c, tag);
624 if (IS_ERR(req))
625 return req;
626
627 /* marshall the data */
628 p9pdu_prepare(req->tc, tag, type);
629 va_start(ap, fmt);
630 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
631 va_end(ap);
632 if (err)
633 goto reterr;
634 p9pdu_finalize(req->tc);
635
636 err = c->trans_mod->request(c, req);
637 if (err < 0) {
638 if (err != -ERESTARTSYS && err != -EFAULT)
639 c->status = Disconnected;
640 goto reterr;
641 }
642
643 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag);
644 err = wait_event_interruptible(*req->wq,
645 req->status >= REQ_STATUS_RCVD);
646 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n",
647 req->wq, tag, err);
648
649 if (req->status == REQ_STATUS_ERROR) {
650 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
651 err = req->t_err;
652 }
653
654 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
655 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
656 sigpending = 1;
657 clear_thread_flag(TIF_SIGPENDING);
658
659 if (c->trans_mod->cancel(c, req))
660 p9_client_flush(c, req);
661
662 /* if we received the response anyway, don't signal error */
663 if (req->status == REQ_STATUS_RCVD)
664 err = 0;
665 }
666
667 if (sigpending) {
668 spin_lock_irqsave(¤t->sighand->siglock, flags);
669 recalc_sigpending();
670 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
671 }
672
673 if (err < 0)
674 goto reterr;
675
676 err = p9_check_errors(c, req);
677 if (!err) {
678 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
679 return req;
680 }
681
682reterr:
683 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
684 err);
685 p9_free_req(c, req);
686 return ERR_PTR(err);
687}
688
689static struct p9_fid *p9_fid_create(struct p9_client *clnt)
690{
691 int ret;
692 struct p9_fid *fid;
693 unsigned long flags;
694
695 P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
696 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
697 if (!fid)
698 return ERR_PTR(-ENOMEM);
699
700 ret = p9_idpool_get(clnt->fidpool);
701 if (ret < 0) {
702 ret = -ENOSPC;
703 goto error;
704 }
705 fid->fid = ret;
706
707 memset(&fid->qid, 0, sizeof(struct p9_qid));
708 fid->mode = -1;
709 fid->uid = current_fsuid();
710 fid->clnt = clnt;
711 fid->rdir = NULL;
712 spin_lock_irqsave(&clnt->lock, flags);
713 list_add(&fid->flist, &clnt->fidlist);
714 spin_unlock_irqrestore(&clnt->lock, flags);
715
716 return fid;
717
718error:
719 kfree(fid);
720 return ERR_PTR(ret);
721}
722
723static void p9_fid_destroy(struct p9_fid *fid)
724{
725 struct p9_client *clnt;
726 unsigned long flags;
727
728 P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
729 clnt = fid->clnt;
730 p9_idpool_put(fid->fid, clnt->fidpool);
731 spin_lock_irqsave(&clnt->lock, flags);
732 list_del(&fid->flist);
733 spin_unlock_irqrestore(&clnt->lock, flags);
734 kfree(fid->rdir);
735 kfree(fid);
736}
737
738static int p9_client_version(struct p9_client *c)
739{
740 int err = 0;
741 struct p9_req_t *req;
742 char *version;
743 int msize;
744
745 P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
746 c->msize, c->proto_version);
747
748 switch (c->proto_version) {
749 case p9_proto_2000L:
750 req = p9_client_rpc(c, P9_TVERSION, "ds",
751 c->msize, "9P2000.L");
752 break;
753 case p9_proto_2000u:
754 req = p9_client_rpc(c, P9_TVERSION, "ds",
755 c->msize, "9P2000.u");
756 break;
757 case p9_proto_legacy:
758 req = p9_client_rpc(c, P9_TVERSION, "ds",
759 c->msize, "9P2000");
760 break;
761 default:
762 return -EINVAL;
763 break;
764 }
765
766 if (IS_ERR(req))
767 return PTR_ERR(req);
768
769 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
770 if (err) {
771 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
772 P9_DUMP_PKT(1, req->rc);
773 goto error;
774 }
775
776 P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
777 if (!strncmp(version, "9P2000.L", 8))
778 c->proto_version = p9_proto_2000L;
779 else if (!strncmp(version, "9P2000.u", 8))
780 c->proto_version = p9_proto_2000u;
781 else if (!strncmp(version, "9P2000", 6))
782 c->proto_version = p9_proto_legacy;
783 else {
784 err = -EREMOTEIO;
785 goto error;
786 }
787
788 if (msize < c->msize)
789 c->msize = msize;
790
791error:
792 kfree(version);
793 p9_free_req(c, req);
794
795 return err;
796}
797
798struct p9_client *p9_client_create(const char *dev_name, char *options)
799{
800 int err;
801 struct p9_client *clnt;
802
803 err = 0;
804 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
805 if (!clnt)
806 return ERR_PTR(-ENOMEM);
807
808 clnt->trans_mod = NULL;
809 clnt->trans = NULL;
810 spin_lock_init(&clnt->lock);
811 INIT_LIST_HEAD(&clnt->fidlist);
812
813 err = p9_tag_init(clnt);
814 if (err < 0)
815 goto free_client;
816
817 err = parse_opts(options, clnt);
818 if (err < 0)
819 goto destroy_tagpool;
820
821 if (!clnt->trans_mod)
822 clnt->trans_mod = v9fs_get_default_trans();
823
824 if (clnt->trans_mod == NULL) {
825 err = -EPROTONOSUPPORT;
826 P9_DPRINTK(P9_DEBUG_ERROR,
827 "No transport defined or default transport\n");
828 goto destroy_tagpool;
829 }
830
831 clnt->fidpool = p9_idpool_create();
832 if (IS_ERR(clnt->fidpool)) {
833 err = PTR_ERR(clnt->fidpool);
834 goto put_trans;
835 }
836
837 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
838 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
839
840 err = clnt->trans_mod->create(clnt, dev_name, options);
841 if (err)
842 goto destroy_fidpool;
843
844 if (clnt->msize > clnt->trans_mod->maxsize)
845 clnt->msize = clnt->trans_mod->maxsize;
846
847 err = p9_client_version(clnt);
848 if (err)
849 goto close_trans;
850
851 return clnt;
852
853close_trans:
854 clnt->trans_mod->close(clnt);
855destroy_fidpool:
856 p9_idpool_destroy(clnt->fidpool);
857put_trans:
858 v9fs_put_trans(clnt->trans_mod);
859destroy_tagpool:
860 p9_idpool_destroy(clnt->tagpool);
861free_client:
862 kfree(clnt);
863 return ERR_PTR(err);
864}
865EXPORT_SYMBOL(p9_client_create);
866
867void p9_client_destroy(struct p9_client *clnt)
868{
869 struct p9_fid *fid, *fidptr;
870
871 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt);
872
873 if (clnt->trans_mod)
874 clnt->trans_mod->close(clnt);
875
876 v9fs_put_trans(clnt->trans_mod);
877
878 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
879 printk(KERN_INFO "Found fid %d not clunked\n", fid->fid);
880 p9_fid_destroy(fid);
881 }
882
883 if (clnt->fidpool)
884 p9_idpool_destroy(clnt->fidpool);
885
886 p9_tag_cleanup(clnt);
887
888 kfree(clnt);
889}
890EXPORT_SYMBOL(p9_client_destroy);
891
892void p9_client_disconnect(struct p9_client *clnt)
893{
894 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
895 clnt->status = Disconnected;
896}
897EXPORT_SYMBOL(p9_client_disconnect);
898
899void p9_client_begin_disconnect(struct p9_client *clnt)
900{
901 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
902 clnt->status = BeginDisconnect;
903}
904EXPORT_SYMBOL(p9_client_begin_disconnect);
905
906struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
907 char *uname, u32 n_uname, char *aname)
908{
909 int err;
910 struct p9_req_t *req;
911 struct p9_fid *fid;
912 struct p9_qid qid;
913
914 P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
915 afid ? afid->fid : -1, uname, aname);
916 err = 0;
917
918 fid = p9_fid_create(clnt);
919 if (IS_ERR(fid)) {
920 err = PTR_ERR(fid);
921 fid = NULL;
922 goto error;
923 }
924
925 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
926 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
927 if (IS_ERR(req)) {
928 err = PTR_ERR(req);
929 goto error;
930 }
931
932 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
933 if (err) {
934 P9_DUMP_PKT(1, req->rc);
935 p9_free_req(clnt, req);
936 goto error;
937 }
938
939 P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
940 qid.type,
941 (unsigned long long)qid.path,
942 qid.version);
943
944 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
945
946 p9_free_req(clnt, req);
947 return fid;
948
949error:
950 if (fid)
951 p9_fid_destroy(fid);
952 return ERR_PTR(err);
953}
954EXPORT_SYMBOL(p9_client_attach);
955
956struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
957 char **wnames, int clone)
958{
959 int err;
960 struct p9_client *clnt;
961 struct p9_fid *fid;
962 struct p9_qid *wqids;
963 struct p9_req_t *req;
964 uint16_t nwqids, count;
965
966 err = 0;
967 wqids = NULL;
968 clnt = oldfid->clnt;
969 if (clone) {
970 fid = p9_fid_create(clnt);
971 if (IS_ERR(fid)) {
972 err = PTR_ERR(fid);
973 fid = NULL;
974 goto error;
975 }
976
977 fid->uid = oldfid->uid;
978 } else
979 fid = oldfid;
980
981
982 P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
983 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
984
985 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
986 nwname, wnames);
987 if (IS_ERR(req)) {
988 err = PTR_ERR(req);
989 goto error;
990 }
991
992 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
993 if (err) {
994 P9_DUMP_PKT(1, req->rc);
995 p9_free_req(clnt, req);
996 goto clunk_fid;
997 }
998 p9_free_req(clnt, req);
999
1000 P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1001
1002 if (nwqids != nwname) {
1003 err = -ENOENT;
1004 goto clunk_fid;
1005 }
1006
1007 for (count = 0; count < nwqids; count++)
1008 P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1009 count, wqids[count].type,
1010 (unsigned long long)wqids[count].path,
1011 wqids[count].version);
1012
1013 if (nwname)
1014 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1015 else
1016 fid->qid = oldfid->qid;
1017
1018 kfree(wqids);
1019 return fid;
1020
1021clunk_fid:
1022 kfree(wqids);
1023 p9_client_clunk(fid);
1024 fid = NULL;
1025
1026error:
1027 if (fid && (fid != oldfid))
1028 p9_fid_destroy(fid);
1029
1030 return ERR_PTR(err);
1031}
1032EXPORT_SYMBOL(p9_client_walk);
1033
1034int p9_client_open(struct p9_fid *fid, int mode)
1035{
1036 int err;
1037 struct p9_client *clnt;
1038 struct p9_req_t *req;
1039 struct p9_qid qid;
1040 int iounit;
1041
1042 clnt = fid->clnt;
1043 P9_DPRINTK(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1044 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1045 err = 0;
1046
1047 if (fid->mode != -1)
1048 return -EINVAL;
1049
1050 if (p9_is_proto_dotl(clnt))
1051 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1052 else
1053 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1054 if (IS_ERR(req)) {
1055 err = PTR_ERR(req);
1056 goto error;
1057 }
1058
1059 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1060 if (err) {
1061 P9_DUMP_PKT(1, req->rc);
1062 goto free_and_error;
1063 }
1064
1065 P9_DPRINTK(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1066 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1067 (unsigned long long)qid.path, qid.version, iounit);
1068
1069 fid->mode = mode;
1070 fid->iounit = iounit;
1071
1072free_and_error:
1073 p9_free_req(clnt, req);
1074error:
1075 return err;
1076}
1077EXPORT_SYMBOL(p9_client_open);
1078
1079int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1080 gid_t gid, struct p9_qid *qid)
1081{
1082 int err = 0;
1083 struct p9_client *clnt;
1084 struct p9_req_t *req;
1085 int iounit;
1086
1087 P9_DPRINTK(P9_DEBUG_9P,
1088 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1089 ofid->fid, name, flags, mode, gid);
1090 clnt = ofid->clnt;
1091
1092 if (ofid->mode != -1)
1093 return -EINVAL;
1094
1095 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags,
1096 mode, gid);
1097 if (IS_ERR(req)) {
1098 err = PTR_ERR(req);
1099 goto error;
1100 }
1101
1102 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1103 if (err) {
1104 P9_DUMP_PKT(1, req->rc);
1105 goto free_and_error;
1106 }
1107
1108 P9_DPRINTK(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1109 qid->type,
1110 (unsigned long long)qid->path,
1111 qid->version, iounit);
1112
1113 ofid->mode = mode;
1114 ofid->iounit = iounit;
1115
1116free_and_error:
1117 p9_free_req(clnt, req);
1118error:
1119 return err;
1120}
1121EXPORT_SYMBOL(p9_client_create_dotl);
1122
1123int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1124 char *extension)
1125{
1126 int err;
1127 struct p9_client *clnt;
1128 struct p9_req_t *req;
1129 struct p9_qid qid;
1130 int iounit;
1131
1132 P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1133 fid->fid, name, perm, mode);
1134 err = 0;
1135 clnt = fid->clnt;
1136
1137 if (fid->mode != -1)
1138 return -EINVAL;
1139
1140 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1141 mode, extension);
1142 if (IS_ERR(req)) {
1143 err = PTR_ERR(req);
1144 goto error;
1145 }
1146
1147 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1148 if (err) {
1149 P9_DUMP_PKT(1, req->rc);
1150 goto free_and_error;
1151 }
1152
1153 P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1154 qid.type,
1155 (unsigned long long)qid.path,
1156 qid.version, iounit);
1157
1158 fid->mode = mode;
1159 fid->iounit = iounit;
1160
1161free_and_error:
1162 p9_free_req(clnt, req);
1163error:
1164 return err;
1165}
1166EXPORT_SYMBOL(p9_client_fcreate);
1167
1168int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid,
1169 struct p9_qid *qid)
1170{
1171 int err = 0;
1172 struct p9_client *clnt;
1173 struct p9_req_t *req;
1174
1175 P9_DPRINTK(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1176 dfid->fid, name, symtgt);
1177 clnt = dfid->clnt;
1178
1179 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt,
1180 gid);
1181 if (IS_ERR(req)) {
1182 err = PTR_ERR(req);
1183 goto error;
1184 }
1185
1186 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1187 if (err) {
1188 P9_DUMP_PKT(1, req->rc);
1189 goto free_and_error;
1190 }
1191
1192 P9_DPRINTK(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1193 qid->type, (unsigned long long)qid->path, qid->version);
1194
1195free_and_error:
1196 p9_free_req(clnt, req);
1197error:
1198 return err;
1199}
1200EXPORT_SYMBOL(p9_client_symlink);
1201
1202int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1203{
1204 struct p9_client *clnt;
1205 struct p9_req_t *req;
1206
1207 P9_DPRINTK(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1208 dfid->fid, oldfid->fid, newname);
1209 clnt = dfid->clnt;
1210 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1211 newname);
1212 if (IS_ERR(req))
1213 return PTR_ERR(req);
1214
1215 P9_DPRINTK(P9_DEBUG_9P, "<<< RLINK\n");
1216 p9_free_req(clnt, req);
1217 return 0;
1218}
1219EXPORT_SYMBOL(p9_client_link);
1220
1221int p9_client_fsync(struct p9_fid *fid, int datasync)
1222{
1223 int err;
1224 struct p9_client *clnt;
1225 struct p9_req_t *req;
1226
1227 P9_DPRINTK(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1228 fid->fid, datasync);
1229 err = 0;
1230 clnt = fid->clnt;
1231
1232 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1233 if (IS_ERR(req)) {
1234 err = PTR_ERR(req);
1235 goto error;
1236 }
1237
1238 P9_DPRINTK(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1239
1240 p9_free_req(clnt, req);
1241
1242error:
1243 return err;
1244}
1245EXPORT_SYMBOL(p9_client_fsync);
1246
1247int p9_client_clunk(struct p9_fid *fid)
1248{
1249 int err;
1250 struct p9_client *clnt;
1251 struct p9_req_t *req;
1252
1253 if (!fid) {
1254 P9_EPRINTK(KERN_WARNING, "Trying to clunk with NULL fid\n");
1255 dump_stack();
1256 return 0;
1257 }
1258
1259 P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
1260 err = 0;
1261 clnt = fid->clnt;
1262
1263 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1264 if (IS_ERR(req)) {
1265 err = PTR_ERR(req);
1266 goto error;
1267 }
1268
1269 P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1270
1271 p9_free_req(clnt, req);
1272error:
1273 /*
1274 * Fid is not valid even after a failed clunk
1275 */
1276 p9_fid_destroy(fid);
1277 return err;
1278}
1279EXPORT_SYMBOL(p9_client_clunk);
1280
1281int p9_client_remove(struct p9_fid *fid)
1282{
1283 int err;
1284 struct p9_client *clnt;
1285 struct p9_req_t *req;
1286
1287 P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1288 err = 0;
1289 clnt = fid->clnt;
1290
1291 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1292 if (IS_ERR(req)) {
1293 err = PTR_ERR(req);
1294 goto error;
1295 }
1296
1297 P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1298
1299 p9_free_req(clnt, req);
1300error:
1301 p9_fid_destroy(fid);
1302 return err;
1303}
1304EXPORT_SYMBOL(p9_client_remove);
1305
1306int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1307{
1308 int err = 0;
1309 struct p9_req_t *req;
1310 struct p9_client *clnt;
1311
1312 P9_DPRINTK(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1313 dfid->fid, name, flags);
1314
1315 clnt = dfid->clnt;
1316 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1317 if (IS_ERR(req)) {
1318 err = PTR_ERR(req);
1319 goto error;
1320 }
1321 P9_DPRINTK(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1322
1323 p9_free_req(clnt, req);
1324error:
1325 return err;
1326}
1327EXPORT_SYMBOL(p9_client_unlinkat);
1328
1329int
1330p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1331 u32 count)
1332{
1333 int err, rsize;
1334 struct p9_client *clnt;
1335 struct p9_req_t *req;
1336 char *dataptr;
1337
1338 P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid,
1339 (long long unsigned) offset, count);
1340 err = 0;
1341 clnt = fid->clnt;
1342
1343 rsize = fid->iounit;
1344 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1345 rsize = clnt->msize - P9_IOHDRSZ;
1346
1347 if (count < rsize)
1348 rsize = count;
1349
1350 /* Don't bother zerocopy for small IO (< 1024) */
1351 if (((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
1352 P9_TRANS_PREF_PAYLOAD_SEP) && (rsize > 1024)) {
1353 req = p9_client_rpc(clnt, P9_TREAD, "dqE", fid->fid, offset,
1354 rsize, data, udata);
1355 } else {
1356 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1357 rsize);
1358 }
1359 if (IS_ERR(req)) {
1360 err = PTR_ERR(req);
1361 goto error;
1362 }
1363
1364 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1365 if (err) {
1366 P9_DUMP_PKT(1, req->rc);
1367 goto free_and_error;
1368 }
1369
1370 P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1371 P9_DUMP_PKT(1, req->rc);
1372
1373 if (!req->tc->pbuf_size) {
1374 if (data) {
1375 memmove(data, dataptr, count);
1376 } else {
1377 err = copy_to_user(udata, dataptr, count);
1378 if (err) {
1379 err = -EFAULT;
1380 goto free_and_error;
1381 }
1382 }
1383 }
1384 p9_free_req(clnt, req);
1385 return count;
1386
1387free_and_error:
1388 p9_free_req(clnt, req);
1389error:
1390 return err;
1391}
1392EXPORT_SYMBOL(p9_client_read);
1393
1394int
1395p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1396 u64 offset, u32 count)
1397{
1398 int err, rsize;
1399 struct p9_client *clnt;
1400 struct p9_req_t *req;
1401
1402 P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1403 fid->fid, (long long unsigned) offset, count);
1404 err = 0;
1405 clnt = fid->clnt;
1406
1407 rsize = fid->iounit;
1408 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1409 rsize = clnt->msize - P9_IOHDRSZ;
1410
1411 if (count < rsize)
1412 rsize = count;
1413
1414 /* Don't bother zerocopy form small IO (< 1024) */
1415 if (((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
1416 P9_TRANS_PREF_PAYLOAD_SEP) && (rsize > 1024)) {
1417 req = p9_client_rpc(clnt, P9_TWRITE, "dqE", fid->fid, offset,
1418 rsize, data, udata);
1419 } else {
1420
1421 if (data)
1422 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
1423 offset, rsize, data);
1424 else
1425 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
1426 offset, rsize, udata);
1427 }
1428 if (IS_ERR(req)) {
1429 err = PTR_ERR(req);
1430 goto error;
1431 }
1432
1433 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1434 if (err) {
1435 P9_DUMP_PKT(1, req->rc);
1436 goto free_and_error;
1437 }
1438
1439 P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1440
1441 p9_free_req(clnt, req);
1442 return count;
1443
1444free_and_error:
1445 p9_free_req(clnt, req);
1446error:
1447 return err;
1448}
1449EXPORT_SYMBOL(p9_client_write);
1450
1451struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1452{
1453 int err;
1454 struct p9_client *clnt;
1455 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1456 struct p9_req_t *req;
1457 u16 ignored;
1458
1459 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1460
1461 if (!ret)
1462 return ERR_PTR(-ENOMEM);
1463
1464 err = 0;
1465 clnt = fid->clnt;
1466
1467 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1468 if (IS_ERR(req)) {
1469 err = PTR_ERR(req);
1470 goto error;
1471 }
1472
1473 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1474 if (err) {
1475 P9_DUMP_PKT(1, req->rc);
1476 p9_free_req(clnt, req);
1477 goto error;
1478 }
1479
1480 P9_DPRINTK(P9_DEBUG_9P,
1481 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1482 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1483 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1484 "<<< uid=%d gid=%d n_muid=%d\n",
1485 ret->size, ret->type, ret->dev, ret->qid.type,
1486 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1487 ret->atime, ret->mtime, (unsigned long long)ret->length,
1488 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1489 ret->n_uid, ret->n_gid, ret->n_muid);
1490
1491 p9_free_req(clnt, req);
1492 return ret;
1493
1494error:
1495 kfree(ret);
1496 return ERR_PTR(err);
1497}
1498EXPORT_SYMBOL(p9_client_stat);
1499
1500struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1501 u64 request_mask)
1502{
1503 int err;
1504 struct p9_client *clnt;
1505 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1506 GFP_KERNEL);
1507 struct p9_req_t *req;
1508
1509 P9_DPRINTK(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1510 fid->fid, request_mask);
1511
1512 if (!ret)
1513 return ERR_PTR(-ENOMEM);
1514
1515 err = 0;
1516 clnt = fid->clnt;
1517
1518 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1519 if (IS_ERR(req)) {
1520 err = PTR_ERR(req);
1521 goto error;
1522 }
1523
1524 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1525 if (err) {
1526 P9_DUMP_PKT(1, req->rc);
1527 p9_free_req(clnt, req);
1528 goto error;
1529 }
1530
1531 P9_DPRINTK(P9_DEBUG_9P,
1532 "<<< RGETATTR st_result_mask=%lld\n"
1533 "<<< qid=%x.%llx.%x\n"
1534 "<<< st_mode=%8.8x st_nlink=%llu\n"
1535 "<<< st_uid=%d st_gid=%d\n"
1536 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1537 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1538 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1539 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1540 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1541 "<<< st_gen=%lld st_data_version=%lld",
1542 ret->st_result_mask, ret->qid.type, ret->qid.path,
1543 ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid,
1544 ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize,
1545 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1546 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1547 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1548 ret->st_gen, ret->st_data_version);
1549
1550 p9_free_req(clnt, req);
1551 return ret;
1552
1553error:
1554 kfree(ret);
1555 return ERR_PTR(err);
1556}
1557EXPORT_SYMBOL(p9_client_getattr_dotl);
1558
1559static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1560{
1561 int ret;
1562
1563 /* NOTE: size shouldn't include its own length */
1564 /* size[2] type[2] dev[4] qid[13] */
1565 /* mode[4] atime[4] mtime[4] length[8]*/
1566 /* name[s] uid[s] gid[s] muid[s] */
1567 ret = 2+4+13+4+4+4+8+2+2+2+2;
1568
1569 if (wst->name)
1570 ret += strlen(wst->name);
1571 if (wst->uid)
1572 ret += strlen(wst->uid);
1573 if (wst->gid)
1574 ret += strlen(wst->gid);
1575 if (wst->muid)
1576 ret += strlen(wst->muid);
1577
1578 if ((proto_version == p9_proto_2000u) ||
1579 (proto_version == p9_proto_2000L)) {
1580 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1581 if (wst->extension)
1582 ret += strlen(wst->extension);
1583 }
1584
1585 return ret;
1586}
1587
1588int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1589{
1590 int err;
1591 struct p9_req_t *req;
1592 struct p9_client *clnt;
1593
1594 err = 0;
1595 clnt = fid->clnt;
1596 wst->size = p9_client_statsize(wst, clnt->proto_version);
1597 P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1598 P9_DPRINTK(P9_DEBUG_9P,
1599 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1600 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1601 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1602 " uid=%d gid=%d n_muid=%d\n",
1603 wst->size, wst->type, wst->dev, wst->qid.type,
1604 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1605 wst->atime, wst->mtime, (unsigned long long)wst->length,
1606 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1607 wst->n_uid, wst->n_gid, wst->n_muid);
1608
1609 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1610 if (IS_ERR(req)) {
1611 err = PTR_ERR(req);
1612 goto error;
1613 }
1614
1615 P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1616
1617 p9_free_req(clnt, req);
1618error:
1619 return err;
1620}
1621EXPORT_SYMBOL(p9_client_wstat);
1622
1623int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1624{
1625 int err;
1626 struct p9_req_t *req;
1627 struct p9_client *clnt;
1628
1629 err = 0;
1630 clnt = fid->clnt;
1631 P9_DPRINTK(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1632 P9_DPRINTK(P9_DEBUG_9P,
1633 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1634 " atime_sec=%lld atime_nsec=%lld\n"
1635 " mtime_sec=%lld mtime_nsec=%lld\n",
1636 p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid,
1637 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1638 p9attr->mtime_sec, p9attr->mtime_nsec);
1639
1640 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1641
1642 if (IS_ERR(req)) {
1643 err = PTR_ERR(req);
1644 goto error;
1645 }
1646 P9_DPRINTK(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1647 p9_free_req(clnt, req);
1648error:
1649 return err;
1650}
1651EXPORT_SYMBOL(p9_client_setattr);
1652
1653int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1654{
1655 int err;
1656 struct p9_req_t *req;
1657 struct p9_client *clnt;
1658
1659 err = 0;
1660 clnt = fid->clnt;
1661
1662 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1663
1664 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1665 if (IS_ERR(req)) {
1666 err = PTR_ERR(req);
1667 goto error;
1668 }
1669
1670 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1671 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1672 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1673 if (err) {
1674 P9_DUMP_PKT(1, req->rc);
1675 p9_free_req(clnt, req);
1676 goto error;
1677 }
1678
1679 P9_DPRINTK(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1680 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1681 "fsid %llu namelen %ld\n",
1682 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1683 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1684 sb->fsid, (long int)sb->namelen);
1685
1686 p9_free_req(clnt, req);
1687error:
1688 return err;
1689}
1690EXPORT_SYMBOL(p9_client_statfs);
1691
1692int p9_client_rename(struct p9_fid *fid,
1693 struct p9_fid *newdirfid, const char *name)
1694{
1695 int err;
1696 struct p9_req_t *req;
1697 struct p9_client *clnt;
1698
1699 err = 0;
1700 clnt = fid->clnt;
1701
1702 P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1703 fid->fid, newdirfid->fid, name);
1704
1705 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1706 newdirfid->fid, name);
1707 if (IS_ERR(req)) {
1708 err = PTR_ERR(req);
1709 goto error;
1710 }
1711
1712 P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1713
1714 p9_free_req(clnt, req);
1715error:
1716 return err;
1717}
1718EXPORT_SYMBOL(p9_client_rename);
1719
1720int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1721 struct p9_fid *newdirfid, const char *new_name)
1722{
1723 int err;
1724 struct p9_req_t *req;
1725 struct p9_client *clnt;
1726
1727 err = 0;
1728 clnt = olddirfid->clnt;
1729
1730 P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1731 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1732 newdirfid->fid, new_name);
1733
1734 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1735 old_name, newdirfid->fid, new_name);
1736 if (IS_ERR(req)) {
1737 err = PTR_ERR(req);
1738 goto error;
1739 }
1740
1741 P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1742 newdirfid->fid, new_name);
1743
1744 p9_free_req(clnt, req);
1745error:
1746 return err;
1747}
1748EXPORT_SYMBOL(p9_client_renameat);
1749
1750/*
1751 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1752 */
1753struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1754 const char *attr_name, u64 *attr_size)
1755{
1756 int err;
1757 struct p9_req_t *req;
1758 struct p9_client *clnt;
1759 struct p9_fid *attr_fid;
1760
1761 err = 0;
1762 clnt = file_fid->clnt;
1763 attr_fid = p9_fid_create(clnt);
1764 if (IS_ERR(attr_fid)) {
1765 err = PTR_ERR(attr_fid);
1766 attr_fid = NULL;
1767 goto error;
1768 }
1769 P9_DPRINTK(P9_DEBUG_9P,
1770 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
1771 file_fid->fid, attr_fid->fid, attr_name);
1772
1773 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
1774 file_fid->fid, attr_fid->fid, attr_name);
1775 if (IS_ERR(req)) {
1776 err = PTR_ERR(req);
1777 goto error;
1778 }
1779 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
1780 if (err) {
1781 P9_DUMP_PKT(1, req->rc);
1782 p9_free_req(clnt, req);
1783 goto clunk_fid;
1784 }
1785 p9_free_req(clnt, req);
1786 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
1787 attr_fid->fid, *attr_size);
1788 return attr_fid;
1789clunk_fid:
1790 p9_client_clunk(attr_fid);
1791 attr_fid = NULL;
1792error:
1793 if (attr_fid && (attr_fid != file_fid))
1794 p9_fid_destroy(attr_fid);
1795
1796 return ERR_PTR(err);
1797}
1798EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
1799
1800int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
1801 u64 attr_size, int flags)
1802{
1803 int err;
1804 struct p9_req_t *req;
1805 struct p9_client *clnt;
1806
1807 P9_DPRINTK(P9_DEBUG_9P,
1808 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
1809 fid->fid, name, (long long)attr_size, flags);
1810 err = 0;
1811 clnt = fid->clnt;
1812 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
1813 fid->fid, name, attr_size, flags);
1814 if (IS_ERR(req)) {
1815 err = PTR_ERR(req);
1816 goto error;
1817 }
1818 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
1819 p9_free_req(clnt, req);
1820error:
1821 return err;
1822}
1823EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
1824
1825int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
1826{
1827 int err, rsize;
1828 struct p9_client *clnt;
1829 struct p9_req_t *req;
1830 char *dataptr;
1831
1832 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
1833 fid->fid, (long long unsigned) offset, count);
1834
1835 err = 0;
1836 clnt = fid->clnt;
1837
1838 rsize = fid->iounit;
1839 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
1840 rsize = clnt->msize - P9_READDIRHDRSZ;
1841
1842 if (count < rsize)
1843 rsize = count;
1844
1845 if ((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
1846 P9_TRANS_PREF_PAYLOAD_SEP) {
1847 req = p9_client_rpc(clnt, P9_TREADDIR, "dqF", fid->fid,
1848 offset, rsize, data);
1849 } else {
1850 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
1851 offset, rsize);
1852 }
1853 if (IS_ERR(req)) {
1854 err = PTR_ERR(req);
1855 goto error;
1856 }
1857
1858 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1859 if (err) {
1860 P9_DUMP_PKT(1, req->rc);
1861 goto free_and_error;
1862 }
1863
1864 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
1865
1866 if (!req->tc->pbuf_size && data)
1867 memmove(data, dataptr, count);
1868
1869 p9_free_req(clnt, req);
1870 return count;
1871
1872free_and_error:
1873 p9_free_req(clnt, req);
1874error:
1875 return err;
1876}
1877EXPORT_SYMBOL(p9_client_readdir);
1878
1879int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
1880 dev_t rdev, gid_t gid, struct p9_qid *qid)
1881{
1882 int err;
1883 struct p9_client *clnt;
1884 struct p9_req_t *req;
1885
1886 err = 0;
1887 clnt = fid->clnt;
1888 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
1889 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
1890 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode,
1891 MAJOR(rdev), MINOR(rdev), gid);
1892 if (IS_ERR(req))
1893 return PTR_ERR(req);
1894
1895 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1896 if (err) {
1897 P9_DUMP_PKT(1, req->rc);
1898 goto error;
1899 }
1900 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
1901 (unsigned long long)qid->path, qid->version);
1902
1903error:
1904 p9_free_req(clnt, req);
1905 return err;
1906
1907}
1908EXPORT_SYMBOL(p9_client_mknod_dotl);
1909
1910int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
1911 gid_t gid, struct p9_qid *qid)
1912{
1913 int err;
1914 struct p9_client *clnt;
1915 struct p9_req_t *req;
1916
1917 err = 0;
1918 clnt = fid->clnt;
1919 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
1920 fid->fid, name, mode, gid);
1921 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode,
1922 gid);
1923 if (IS_ERR(req))
1924 return PTR_ERR(req);
1925
1926 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1927 if (err) {
1928 P9_DUMP_PKT(1, req->rc);
1929 goto error;
1930 }
1931 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
1932 (unsigned long long)qid->path, qid->version);
1933
1934error:
1935 p9_free_req(clnt, req);
1936 return err;
1937
1938}
1939EXPORT_SYMBOL(p9_client_mkdir_dotl);
1940
1941int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
1942{
1943 int err;
1944 struct p9_client *clnt;
1945 struct p9_req_t *req;
1946
1947 err = 0;
1948 clnt = fid->clnt;
1949 P9_DPRINTK(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
1950 "start %lld length %lld proc_id %d client_id %s\n",
1951 fid->fid, flock->type, flock->flags, flock->start,
1952 flock->length, flock->proc_id, flock->client_id);
1953
1954 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
1955 flock->flags, flock->start, flock->length,
1956 flock->proc_id, flock->client_id);
1957
1958 if (IS_ERR(req))
1959 return PTR_ERR(req);
1960
1961 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
1962 if (err) {
1963 P9_DUMP_PKT(1, req->rc);
1964 goto error;
1965 }
1966 P9_DPRINTK(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
1967error:
1968 p9_free_req(clnt, req);
1969 return err;
1970
1971}
1972EXPORT_SYMBOL(p9_client_lock_dotl);
1973
1974int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
1975{
1976 int err;
1977 struct p9_client *clnt;
1978 struct p9_req_t *req;
1979
1980 err = 0;
1981 clnt = fid->clnt;
1982 P9_DPRINTK(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
1983 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
1984 glock->start, glock->length, glock->proc_id, glock->client_id);
1985
1986 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
1987 glock->start, glock->length, glock->proc_id, glock->client_id);
1988
1989 if (IS_ERR(req))
1990 return PTR_ERR(req);
1991
1992 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
1993 &glock->start, &glock->length, &glock->proc_id,
1994 &glock->client_id);
1995 if (err) {
1996 P9_DUMP_PKT(1, req->rc);
1997 goto error;
1998 }
1999 P9_DPRINTK(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2000 "proc_id %d client_id %s\n", glock->type, glock->start,
2001 glock->length, glock->proc_id, glock->client_id);
2002error:
2003 p9_free_req(clnt, req);
2004 return err;
2005}
2006EXPORT_SYMBOL(p9_client_getlock_dotl);
2007
2008int p9_client_readlink(struct p9_fid *fid, char **target)
2009{
2010 int err;
2011 struct p9_client *clnt;
2012 struct p9_req_t *req;
2013
2014 err = 0;
2015 clnt = fid->clnt;
2016 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2017
2018 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2019 if (IS_ERR(req))
2020 return PTR_ERR(req);
2021
2022 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2023 if (err) {
2024 P9_DUMP_PKT(1, req->rc);
2025 goto error;
2026 }
2027 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2028error:
2029 p9_free_req(clnt, req);
2030 return err;
2031}
2032EXPORT_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 <net/9p/9p.h>
22#include <linux/parser.h>
23#include <linux/seq_file.h>
24#include <net/9p/client.h>
25#include <net/9p/transport.h>
26#include "protocol.h"
27
28#define CREATE_TRACE_POINTS
29#include <trace/events/9p.h>
30
31#define DEFAULT_MSIZE (128 * 1024)
32
33/* Client Option Parsing (code inspired by NFS code)
34 * - a little lazy - parse all client options
35 */
36
37enum {
38 Opt_msize,
39 Opt_trans,
40 Opt_legacy,
41 Opt_version,
42 Opt_err,
43};
44
45static const match_table_t tokens = {
46 {Opt_msize, "msize=%u"},
47 {Opt_legacy, "noextend"},
48 {Opt_trans, "trans=%s"},
49 {Opt_version, "version=%s"},
50 {Opt_err, NULL},
51};
52
53inline int p9_is_proto_dotl(struct p9_client *clnt)
54{
55 return clnt->proto_version == p9_proto_2000L;
56}
57EXPORT_SYMBOL(p9_is_proto_dotl);
58
59inline int p9_is_proto_dotu(struct p9_client *clnt)
60{
61 return clnt->proto_version == p9_proto_2000u;
62}
63EXPORT_SYMBOL(p9_is_proto_dotu);
64
65int p9_show_client_options(struct seq_file *m, struct p9_client *clnt)
66{
67 if (clnt->msize != DEFAULT_MSIZE)
68 seq_printf(m, ",msize=%u", clnt->msize);
69 seq_printf(m, ",trans=%s", clnt->trans_mod->name);
70
71 switch (clnt->proto_version) {
72 case p9_proto_legacy:
73 seq_puts(m, ",noextend");
74 break;
75 case p9_proto_2000u:
76 seq_puts(m, ",version=9p2000.u");
77 break;
78 case p9_proto_2000L:
79 /* Default */
80 break;
81 }
82
83 if (clnt->trans_mod->show_options)
84 return clnt->trans_mod->show_options(m, clnt);
85 return 0;
86}
87EXPORT_SYMBOL(p9_show_client_options);
88
89/* Some error codes are taken directly from the server replies,
90 * make sure they are valid.
91 */
92static int safe_errno(int err)
93{
94 if (err > 0 || err < -MAX_ERRNO) {
95 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err);
96 return -EPROTO;
97 }
98 return err;
99}
100
101/* Interpret mount option for protocol version */
102static int get_protocol_version(char *s)
103{
104 int version = -EINVAL;
105
106 if (!strcmp(s, "9p2000")) {
107 version = p9_proto_legacy;
108 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n");
109 } else if (!strcmp(s, "9p2000.u")) {
110 version = p9_proto_2000u;
111 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
112 } else if (!strcmp(s, "9p2000.L")) {
113 version = p9_proto_2000L;
114 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
115 } else {
116 pr_info("Unknown protocol version %s\n", s);
117 }
118
119 return version;
120}
121
122/**
123 * parse_opts - parse mount options into client structure
124 * @opts: options string passed from mount
125 * @clnt: existing v9fs client information
126 *
127 * Return 0 upon success, -ERRNO upon failure
128 */
129
130static int parse_opts(char *opts, struct p9_client *clnt)
131{
132 char *options, *tmp_options;
133 char *p;
134 substring_t args[MAX_OPT_ARGS];
135 int option;
136 char *s;
137 int ret = 0;
138
139 clnt->proto_version = p9_proto_2000L;
140 clnt->msize = DEFAULT_MSIZE;
141
142 if (!opts)
143 return 0;
144
145 tmp_options = kstrdup(opts, GFP_KERNEL);
146 if (!tmp_options)
147 return -ENOMEM;
148 options = tmp_options;
149
150 while ((p = strsep(&options, ",")) != NULL) {
151 int token, r;
152
153 if (!*p)
154 continue;
155 token = match_token(p, tokens, args);
156 switch (token) {
157 case Opt_msize:
158 r = match_int(&args[0], &option);
159 if (r < 0) {
160 p9_debug(P9_DEBUG_ERROR,
161 "integer field, but no integer?\n");
162 ret = r;
163 continue;
164 }
165 if (option < 4096) {
166 p9_debug(P9_DEBUG_ERROR,
167 "msize should be at least 4k\n");
168 ret = -EINVAL;
169 continue;
170 }
171 clnt->msize = option;
172 break;
173 case Opt_trans:
174 s = match_strdup(&args[0]);
175 if (!s) {
176 ret = -ENOMEM;
177 p9_debug(P9_DEBUG_ERROR,
178 "problem allocating copy of trans arg\n");
179 goto free_and_return;
180 }
181
182 v9fs_put_trans(clnt->trans_mod);
183 clnt->trans_mod = v9fs_get_trans_by_name(s);
184 if (!clnt->trans_mod) {
185 pr_info("Could not find request transport: %s\n",
186 s);
187 ret = -EINVAL;
188 }
189 kfree(s);
190 break;
191 case Opt_legacy:
192 clnt->proto_version = p9_proto_legacy;
193 break;
194 case Opt_version:
195 s = match_strdup(&args[0]);
196 if (!s) {
197 ret = -ENOMEM;
198 p9_debug(P9_DEBUG_ERROR,
199 "problem allocating copy of version arg\n");
200 goto free_and_return;
201 }
202 r = get_protocol_version(s);
203 if (r < 0)
204 ret = r;
205 else
206 clnt->proto_version = r;
207 kfree(s);
208 break;
209 default:
210 continue;
211 }
212 }
213
214free_and_return:
215 if (ret)
216 v9fs_put_trans(clnt->trans_mod);
217 kfree(tmp_options);
218 return ret;
219}
220
221static int p9_fcall_init(struct p9_client *c, struct p9_fcall *fc,
222 int alloc_msize)
223{
224 if (likely(c->fcall_cache) && alloc_msize == c->msize) {
225 fc->sdata = kmem_cache_alloc(c->fcall_cache, GFP_NOFS);
226 fc->cache = c->fcall_cache;
227 } else {
228 fc->sdata = kmalloc(alloc_msize, GFP_NOFS);
229 fc->cache = NULL;
230 }
231 if (!fc->sdata)
232 return -ENOMEM;
233 fc->capacity = alloc_msize;
234 return 0;
235}
236
237void p9_fcall_fini(struct p9_fcall *fc)
238{
239 /* sdata can be NULL for interrupted requests in trans_rdma,
240 * and kmem_cache_free does not do NULL-check for us
241 */
242 if (unlikely(!fc->sdata))
243 return;
244
245 if (fc->cache)
246 kmem_cache_free(fc->cache, fc->sdata);
247 else
248 kfree(fc->sdata);
249}
250EXPORT_SYMBOL(p9_fcall_fini);
251
252static struct kmem_cache *p9_req_cache;
253
254/**
255 * p9_tag_alloc - Allocate a new request.
256 * @c: Client session.
257 * @type: Transaction type.
258 * @t_size: Buffer size for holding this request
259 * (automatic calculation by format template if 0).
260 * @r_size: Buffer size for holding server's reply on this request
261 * (automatic calculation by format template if 0).
262 * @fmt: Format template for assembling 9p request message
263 * (see p9pdu_vwritef).
264 * @ap: Variable arguments to be fed to passed format template
265 * (see p9pdu_vwritef).
266 *
267 * Context: Process context.
268 * Return: Pointer to new request.
269 */
270static struct p9_req_t *
271p9_tag_alloc(struct p9_client *c, int8_t type, uint t_size, uint r_size,
272 const char *fmt, va_list ap)
273{
274 struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS);
275 int alloc_tsize;
276 int alloc_rsize;
277 int tag;
278 va_list apc;
279
280 va_copy(apc, ap);
281 alloc_tsize = min_t(size_t, c->msize,
282 t_size ?: p9_msg_buf_size(c, type, fmt, apc));
283 va_end(apc);
284
285 alloc_rsize = min_t(size_t, c->msize,
286 r_size ?: p9_msg_buf_size(c, type + 1, fmt, ap));
287
288 if (!req)
289 return ERR_PTR(-ENOMEM);
290
291 if (p9_fcall_init(c, &req->tc, alloc_tsize))
292 goto free_req;
293 if (p9_fcall_init(c, &req->rc, alloc_rsize))
294 goto free;
295
296 p9pdu_reset(&req->tc);
297 p9pdu_reset(&req->rc);
298 req->t_err = 0;
299 req->status = REQ_STATUS_ALLOC;
300 /* refcount needs to be set to 0 before inserting into the idr
301 * so p9_tag_lookup does not accept a request that is not fully
302 * initialized. refcount_set to 2 below will mark request ready.
303 */
304 refcount_set(&req->refcount, 0);
305 init_waitqueue_head(&req->wq);
306 INIT_LIST_HEAD(&req->req_list);
307
308 idr_preload(GFP_NOFS);
309 spin_lock_irq(&c->lock);
310 if (type == P9_TVERSION)
311 tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1,
312 GFP_NOWAIT);
313 else
314 tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT);
315 req->tc.tag = tag;
316 spin_unlock_irq(&c->lock);
317 idr_preload_end();
318 if (tag < 0)
319 goto free;
320
321 /* Init ref to two because in the general case there is one ref
322 * that is put asynchronously by a writer thread, one ref
323 * temporarily given by p9_tag_lookup and put by p9_client_cb
324 * in the recv thread, and one ref put by p9_req_put in the
325 * main thread. The only exception is virtio that does not use
326 * p9_tag_lookup but does not have a writer thread either
327 * (the write happens synchronously in the request/zc_request
328 * callback), so p9_client_cb eats the second ref there
329 * as the pointer is duplicated directly by virtqueue_add_sgs()
330 */
331 refcount_set(&req->refcount, 2);
332
333 return req;
334
335free:
336 p9_fcall_fini(&req->tc);
337 p9_fcall_fini(&req->rc);
338free_req:
339 kmem_cache_free(p9_req_cache, req);
340 return ERR_PTR(-ENOMEM);
341}
342
343/**
344 * p9_tag_lookup - Look up a request by tag.
345 * @c: Client session.
346 * @tag: Transaction ID.
347 *
348 * Context: Any context.
349 * Return: A request, or %NULL if there is no request with that tag.
350 */
351struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
352{
353 struct p9_req_t *req;
354
355 rcu_read_lock();
356again:
357 req = idr_find(&c->reqs, tag);
358 if (req) {
359 /* We have to be careful with the req found under rcu_read_lock
360 * Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the
361 * ref again without corrupting other data, then check again
362 * that the tag matches once we have the ref
363 */
364 if (!p9_req_try_get(req))
365 goto again;
366 if (req->tc.tag != tag) {
367 p9_req_put(c, req);
368 goto again;
369 }
370 }
371 rcu_read_unlock();
372
373 return req;
374}
375EXPORT_SYMBOL(p9_tag_lookup);
376
377/**
378 * p9_tag_remove - Remove a tag.
379 * @c: Client session.
380 * @r: Request of reference.
381 *
382 * Context: Any context.
383 */
384static void p9_tag_remove(struct p9_client *c, struct p9_req_t *r)
385{
386 unsigned long flags;
387 u16 tag = r->tc.tag;
388
389 p9_debug(P9_DEBUG_MUX, "freeing clnt %p req %p tag: %d\n", c, r, tag);
390 spin_lock_irqsave(&c->lock, flags);
391 idr_remove(&c->reqs, tag);
392 spin_unlock_irqrestore(&c->lock, flags);
393}
394
395int p9_req_put(struct p9_client *c, struct p9_req_t *r)
396{
397 if (refcount_dec_and_test(&r->refcount)) {
398 p9_tag_remove(c, r);
399
400 p9_fcall_fini(&r->tc);
401 p9_fcall_fini(&r->rc);
402 kmem_cache_free(p9_req_cache, r);
403 return 1;
404 }
405 return 0;
406}
407EXPORT_SYMBOL(p9_req_put);
408
409/**
410 * p9_tag_cleanup - cleans up tags structure and reclaims resources
411 * @c: v9fs client struct
412 *
413 * This frees resources associated with the tags structure
414 *
415 */
416static void p9_tag_cleanup(struct p9_client *c)
417{
418 struct p9_req_t *req;
419 int id;
420
421 rcu_read_lock();
422 idr_for_each_entry(&c->reqs, req, id) {
423 pr_info("Tag %d still in use\n", id);
424 if (p9_req_put(c, req) == 0)
425 pr_warn("Packet with tag %d has still references",
426 req->tc.tag);
427 }
428 rcu_read_unlock();
429}
430
431/**
432 * p9_client_cb - call back from transport to client
433 * @c: client state
434 * @req: request received
435 * @status: request status, one of REQ_STATUS_*
436 *
437 */
438void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status)
439{
440 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag);
441
442 /* This barrier is needed to make sure any change made to req before
443 * the status change is visible to another thread
444 */
445 smp_wmb();
446 WRITE_ONCE(req->status, status);
447
448 wake_up(&req->wq);
449 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag);
450 p9_req_put(c, req);
451}
452EXPORT_SYMBOL(p9_client_cb);
453
454/**
455 * p9_parse_header - parse header arguments out of a packet
456 * @pdu: packet to parse
457 * @size: size of packet
458 * @type: type of request
459 * @tag: tag of packet
460 * @rewind: set if we need to rewind offset afterwards
461 */
462
463int
464p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type,
465 int16_t *tag, int rewind)
466{
467 s8 r_type;
468 s16 r_tag;
469 s32 r_size;
470 int offset = pdu->offset;
471 int err;
472
473 pdu->offset = 0;
474
475 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
476 if (err)
477 goto rewind_and_exit;
478
479 if (type)
480 *type = r_type;
481 if (tag)
482 *tag = r_tag;
483 if (size)
484 *size = r_size;
485
486 if (pdu->size != r_size || r_size < 7) {
487 err = -EINVAL;
488 goto rewind_and_exit;
489 }
490
491 pdu->id = r_type;
492 pdu->tag = r_tag;
493
494 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
495 pdu->size, pdu->id, pdu->tag);
496
497rewind_and_exit:
498 if (rewind)
499 pdu->offset = offset;
500 return err;
501}
502EXPORT_SYMBOL(p9_parse_header);
503
504/**
505 * p9_check_errors - check 9p packet for error return and process it
506 * @c: current client instance
507 * @req: request to parse and check for error conditions
508 *
509 * returns error code if one is discovered, otherwise returns 0
510 *
511 * this will have to be more complicated if we have multiple
512 * error packet types
513 */
514
515static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
516{
517 s8 type;
518 int err;
519 int ecode;
520
521 err = p9_parse_header(&req->rc, NULL, &type, NULL, 0);
522 if (req->rc.size > req->rc.capacity && !req->rc.zc) {
523 pr_err("requested packet size too big: %d does not fit %zu (type=%d)\n",
524 req->rc.size, req->rc.capacity, req->rc.id);
525 return -EIO;
526 }
527 /* dump the response from server
528 * This should be after check errors which poplulate pdu_fcall.
529 */
530 trace_9p_protocol_dump(c, &req->rc);
531 if (err) {
532 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
533 return err;
534 }
535 if (type != P9_RERROR && type != P9_RLERROR)
536 return 0;
537
538 if (!p9_is_proto_dotl(c)) {
539 char *ename;
540
541 err = p9pdu_readf(&req->rc, c->proto_version, "s?d",
542 &ename, &ecode);
543 if (err)
544 goto out_err;
545
546 if (p9_is_proto_dotu(c) && ecode < 512)
547 err = -ecode;
548
549 if (!err) {
550 err = p9_errstr2errno(ename, strlen(ename));
551
552 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
553 -ecode, ename);
554 }
555 kfree(ename);
556 } else {
557 err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode);
558 if (err)
559 goto out_err;
560 err = -ecode;
561
562 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
563 }
564
565 return err;
566
567out_err:
568 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
569
570 return err;
571}
572
573static struct p9_req_t *
574p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
575
576/**
577 * p9_client_flush - flush (cancel) a request
578 * @c: client state
579 * @oldreq: request to cancel
580 *
581 * This sents a flush for a particular request and links
582 * the flush request to the original request. The current
583 * code only supports a single flush request although the protocol
584 * allows for multiple flush requests to be sent for a single request.
585 *
586 */
587
588static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
589{
590 struct p9_req_t *req;
591 s16 oldtag;
592 int err;
593
594 err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1);
595 if (err)
596 return err;
597
598 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
599
600 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
601 if (IS_ERR(req))
602 return PTR_ERR(req);
603
604 /* if we haven't received a response for oldreq,
605 * remove it from the list
606 */
607 if (READ_ONCE(oldreq->status) == REQ_STATUS_SENT) {
608 if (c->trans_mod->cancelled)
609 c->trans_mod->cancelled(c, oldreq);
610 }
611
612 p9_req_put(c, req);
613 return 0;
614}
615
616static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
617 int8_t type, uint t_size, uint r_size,
618 const char *fmt, va_list ap)
619{
620 int err;
621 struct p9_req_t *req;
622 va_list apc;
623
624 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
625
626 /* we allow for any status other than disconnected */
627 if (c->status == Disconnected)
628 return ERR_PTR(-EIO);
629
630 /* if status is begin_disconnected we allow only clunk request */
631 if (c->status == BeginDisconnect && type != P9_TCLUNK)
632 return ERR_PTR(-EIO);
633
634 va_copy(apc, ap);
635 req = p9_tag_alloc(c, type, t_size, r_size, fmt, apc);
636 va_end(apc);
637 if (IS_ERR(req))
638 return req;
639
640 /* marshall the data */
641 p9pdu_prepare(&req->tc, req->tc.tag, type);
642 err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap);
643 if (err)
644 goto reterr;
645 p9pdu_finalize(c, &req->tc);
646 trace_9p_client_req(c, type, req->tc.tag);
647 return req;
648reterr:
649 p9_req_put(c, req);
650 /* We have to put also the 2nd reference as it won't be used */
651 p9_req_put(c, req);
652 return ERR_PTR(err);
653}
654
655/**
656 * p9_client_rpc - issue a request and wait for a response
657 * @c: client session
658 * @type: type of request
659 * @fmt: protocol format string (see protocol.c)
660 *
661 * Returns request structure (which client must free using p9_req_put)
662 */
663
664static struct p9_req_t *
665p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
666{
667 va_list ap;
668 int sigpending, err;
669 unsigned long flags;
670 struct p9_req_t *req;
671 /* Passing zero for tsize/rsize to p9_client_prepare_req() tells it to
672 * auto determine an appropriate (small) request/response size
673 * according to actual message data being sent. Currently RDMA
674 * transport is excluded from this response message size optimization,
675 * as it would not cope with it, due to its pooled response buffers
676 * (using an optimized request size for RDMA as well though).
677 */
678 const uint tsize = 0;
679 const uint rsize = c->trans_mod->pooled_rbuffers ? c->msize : 0;
680
681 va_start(ap, fmt);
682 req = p9_client_prepare_req(c, type, tsize, rsize, fmt, ap);
683 va_end(ap);
684 if (IS_ERR(req))
685 return req;
686
687 req->tc.zc = false;
688 req->rc.zc = false;
689
690 if (signal_pending(current)) {
691 sigpending = 1;
692 clear_thread_flag(TIF_SIGPENDING);
693 } else {
694 sigpending = 0;
695 }
696
697 err = c->trans_mod->request(c, req);
698 if (err < 0) {
699 /* write won't happen */
700 p9_req_put(c, req);
701 if (err != -ERESTARTSYS && err != -EFAULT)
702 c->status = Disconnected;
703 goto recalc_sigpending;
704 }
705again:
706 /* Wait for the response */
707 err = wait_event_killable(req->wq,
708 READ_ONCE(req->status) >= REQ_STATUS_RCVD);
709
710 /* Make sure our req is coherent with regard to updates in other
711 * threads - echoes to wmb() in the callback
712 */
713 smp_rmb();
714
715 if (err == -ERESTARTSYS && c->status == Connected &&
716 type == P9_TFLUSH) {
717 sigpending = 1;
718 clear_thread_flag(TIF_SIGPENDING);
719 goto again;
720 }
721
722 if (READ_ONCE(req->status) == REQ_STATUS_ERROR) {
723 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
724 err = req->t_err;
725 }
726 if (err == -ERESTARTSYS && c->status == Connected) {
727 p9_debug(P9_DEBUG_MUX, "flushing\n");
728 sigpending = 1;
729 clear_thread_flag(TIF_SIGPENDING);
730
731 if (c->trans_mod->cancel(c, req))
732 p9_client_flush(c, req);
733
734 /* if we received the response anyway, don't signal error */
735 if (READ_ONCE(req->status) == REQ_STATUS_RCVD)
736 err = 0;
737 }
738recalc_sigpending:
739 if (sigpending) {
740 spin_lock_irqsave(¤t->sighand->siglock, flags);
741 recalc_sigpending();
742 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
743 }
744 if (err < 0)
745 goto reterr;
746
747 err = p9_check_errors(c, req);
748 trace_9p_client_res(c, type, req->rc.tag, err);
749 if (!err)
750 return req;
751reterr:
752 p9_req_put(c, req);
753 return ERR_PTR(safe_errno(err));
754}
755
756/**
757 * p9_client_zc_rpc - issue a request and wait for a response
758 * @c: client session
759 * @type: type of request
760 * @uidata: destination for zero copy read
761 * @uodata: source for zero copy write
762 * @inlen: read buffer size
763 * @olen: write buffer size
764 * @in_hdrlen: reader header size, This is the size of response protocol data
765 * @fmt: protocol format string (see protocol.c)
766 *
767 * Returns request structure (which client must free using p9_req_put)
768 */
769static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
770 struct iov_iter *uidata,
771 struct iov_iter *uodata,
772 int inlen, int olen, int in_hdrlen,
773 const char *fmt, ...)
774{
775 va_list ap;
776 int sigpending, err;
777 unsigned long flags;
778 struct p9_req_t *req;
779
780 va_start(ap, fmt);
781 /* We allocate a inline protocol data of only 4k bytes.
782 * The actual content is passed in zero-copy fashion.
783 */
784 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, P9_ZC_HDR_SZ, fmt, ap);
785 va_end(ap);
786 if (IS_ERR(req))
787 return req;
788
789 req->tc.zc = true;
790 req->rc.zc = true;
791
792 if (signal_pending(current)) {
793 sigpending = 1;
794 clear_thread_flag(TIF_SIGPENDING);
795 } else {
796 sigpending = 0;
797 }
798
799 err = c->trans_mod->zc_request(c, req, uidata, uodata,
800 inlen, olen, in_hdrlen);
801 if (err < 0) {
802 if (err == -EIO)
803 c->status = Disconnected;
804 if (err != -ERESTARTSYS)
805 goto recalc_sigpending;
806 }
807 if (READ_ONCE(req->status) == REQ_STATUS_ERROR) {
808 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
809 err = req->t_err;
810 }
811 if (err == -ERESTARTSYS && c->status == Connected) {
812 p9_debug(P9_DEBUG_MUX, "flushing\n");
813 sigpending = 1;
814 clear_thread_flag(TIF_SIGPENDING);
815
816 if (c->trans_mod->cancel(c, req))
817 p9_client_flush(c, req);
818
819 /* if we received the response anyway, don't signal error */
820 if (READ_ONCE(req->status) == REQ_STATUS_RCVD)
821 err = 0;
822 }
823recalc_sigpending:
824 if (sigpending) {
825 spin_lock_irqsave(¤t->sighand->siglock, flags);
826 recalc_sigpending();
827 spin_unlock_irqrestore(¤t->sighand->siglock, flags);
828 }
829 if (err < 0)
830 goto reterr;
831
832 err = p9_check_errors(c, req);
833 trace_9p_client_res(c, type, req->rc.tag, err);
834 if (!err)
835 return req;
836reterr:
837 p9_req_put(c, req);
838 return ERR_PTR(safe_errno(err));
839}
840
841static struct p9_fid *p9_fid_create(struct p9_client *clnt)
842{
843 int ret;
844 struct p9_fid *fid;
845
846 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
847 fid = kzalloc(sizeof(*fid), GFP_KERNEL);
848 if (!fid)
849 return NULL;
850
851 fid->mode = -1;
852 fid->uid = current_fsuid();
853 fid->clnt = clnt;
854 refcount_set(&fid->count, 1);
855
856 idr_preload(GFP_KERNEL);
857 spin_lock_irq(&clnt->lock);
858 ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1,
859 GFP_NOWAIT);
860 spin_unlock_irq(&clnt->lock);
861 idr_preload_end();
862 if (!ret) {
863 trace_9p_fid_ref(fid, P9_FID_REF_CREATE);
864 return fid;
865 }
866
867 kfree(fid);
868 return NULL;
869}
870
871static void p9_fid_destroy(struct p9_fid *fid)
872{
873 struct p9_client *clnt;
874 unsigned long flags;
875
876 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
877 trace_9p_fid_ref(fid, P9_FID_REF_DESTROY);
878 clnt = fid->clnt;
879 spin_lock_irqsave(&clnt->lock, flags);
880 idr_remove(&clnt->fids, fid->fid);
881 spin_unlock_irqrestore(&clnt->lock, flags);
882 kfree(fid->rdir);
883 kfree(fid);
884}
885
886/* We also need to export tracepoint symbols for tracepoint_enabled() */
887EXPORT_TRACEPOINT_SYMBOL(9p_fid_ref);
888
889void do_trace_9p_fid_get(struct p9_fid *fid)
890{
891 trace_9p_fid_ref(fid, P9_FID_REF_GET);
892}
893EXPORT_SYMBOL(do_trace_9p_fid_get);
894
895void do_trace_9p_fid_put(struct p9_fid *fid)
896{
897 trace_9p_fid_ref(fid, P9_FID_REF_PUT);
898}
899EXPORT_SYMBOL(do_trace_9p_fid_put);
900
901static int p9_client_version(struct p9_client *c)
902{
903 int err = 0;
904 struct p9_req_t *req;
905 char *version = NULL;
906 int msize;
907
908 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
909 c->msize, c->proto_version);
910
911 switch (c->proto_version) {
912 case p9_proto_2000L:
913 req = p9_client_rpc(c, P9_TVERSION, "ds",
914 c->msize, "9P2000.L");
915 break;
916 case p9_proto_2000u:
917 req = p9_client_rpc(c, P9_TVERSION, "ds",
918 c->msize, "9P2000.u");
919 break;
920 case p9_proto_legacy:
921 req = p9_client_rpc(c, P9_TVERSION, "ds",
922 c->msize, "9P2000");
923 break;
924 default:
925 return -EINVAL;
926 }
927
928 if (IS_ERR(req))
929 return PTR_ERR(req);
930
931 err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version);
932 if (err) {
933 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
934 trace_9p_protocol_dump(c, &req->rc);
935 goto error;
936 }
937
938 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
939 if (!strncmp(version, "9P2000.L", 8)) {
940 c->proto_version = p9_proto_2000L;
941 } else if (!strncmp(version, "9P2000.u", 8)) {
942 c->proto_version = p9_proto_2000u;
943 } else if (!strncmp(version, "9P2000", 6)) {
944 c->proto_version = p9_proto_legacy;
945 } else {
946 p9_debug(P9_DEBUG_ERROR,
947 "server returned an unknown version: %s\n", version);
948 err = -EREMOTEIO;
949 goto error;
950 }
951
952 if (msize < 4096) {
953 p9_debug(P9_DEBUG_ERROR,
954 "server returned a msize < 4096: %d\n", msize);
955 err = -EREMOTEIO;
956 goto error;
957 }
958 if (msize < c->msize)
959 c->msize = msize;
960
961error:
962 kfree(version);
963 p9_req_put(c, req);
964
965 return err;
966}
967
968struct p9_client *p9_client_create(const char *dev_name, char *options)
969{
970 int err;
971 struct p9_client *clnt;
972 char *client_id;
973
974 err = 0;
975 clnt = kmalloc(sizeof(*clnt), GFP_KERNEL);
976 if (!clnt)
977 return ERR_PTR(-ENOMEM);
978
979 clnt->trans_mod = NULL;
980 clnt->trans = NULL;
981 clnt->fcall_cache = NULL;
982
983 client_id = utsname()->nodename;
984 memcpy(clnt->name, client_id, strlen(client_id) + 1);
985
986 spin_lock_init(&clnt->lock);
987 idr_init(&clnt->fids);
988 idr_init(&clnt->reqs);
989
990 err = parse_opts(options, clnt);
991 if (err < 0)
992 goto free_client;
993
994 if (!clnt->trans_mod)
995 clnt->trans_mod = v9fs_get_default_trans();
996
997 if (!clnt->trans_mod) {
998 err = -EPROTONOSUPPORT;
999 p9_debug(P9_DEBUG_ERROR,
1000 "No transport defined or default transport\n");
1001 goto free_client;
1002 }
1003
1004 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1005 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1006
1007 err = clnt->trans_mod->create(clnt, dev_name, options);
1008 if (err)
1009 goto put_trans;
1010
1011 if (clnt->msize > clnt->trans_mod->maxsize) {
1012 clnt->msize = clnt->trans_mod->maxsize;
1013 pr_info("Limiting 'msize' to %d as this is the maximum "
1014 "supported by transport %s\n",
1015 clnt->msize, clnt->trans_mod->name
1016 );
1017 }
1018
1019 if (clnt->msize < 4096) {
1020 p9_debug(P9_DEBUG_ERROR,
1021 "Please specify a msize of at least 4k\n");
1022 err = -EINVAL;
1023 goto close_trans;
1024 }
1025
1026 err = p9_client_version(clnt);
1027 if (err)
1028 goto close_trans;
1029
1030 /* P9_HDRSZ + 4 is the smallest packet header we can have that is
1031 * followed by data accessed from userspace by read
1032 */
1033 clnt->fcall_cache =
1034 kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize,
1035 0, 0, P9_HDRSZ + 4,
1036 clnt->msize - (P9_HDRSZ + 4),
1037 NULL);
1038
1039 return clnt;
1040
1041close_trans:
1042 clnt->trans_mod->close(clnt);
1043put_trans:
1044 v9fs_put_trans(clnt->trans_mod);
1045free_client:
1046 kfree(clnt);
1047 return ERR_PTR(err);
1048}
1049EXPORT_SYMBOL(p9_client_create);
1050
1051void p9_client_destroy(struct p9_client *clnt)
1052{
1053 struct p9_fid *fid;
1054 int id;
1055
1056 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1057
1058 if (clnt->trans_mod)
1059 clnt->trans_mod->close(clnt);
1060
1061 v9fs_put_trans(clnt->trans_mod);
1062
1063 idr_for_each_entry(&clnt->fids, fid, id) {
1064 pr_info("Found fid %d not clunked\n", fid->fid);
1065 p9_fid_destroy(fid);
1066 }
1067
1068 p9_tag_cleanup(clnt);
1069
1070 kmem_cache_destroy(clnt->fcall_cache);
1071 kfree(clnt);
1072}
1073EXPORT_SYMBOL(p9_client_destroy);
1074
1075void p9_client_disconnect(struct p9_client *clnt)
1076{
1077 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1078 clnt->status = Disconnected;
1079}
1080EXPORT_SYMBOL(p9_client_disconnect);
1081
1082void p9_client_begin_disconnect(struct p9_client *clnt)
1083{
1084 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1085 clnt->status = BeginDisconnect;
1086}
1087EXPORT_SYMBOL(p9_client_begin_disconnect);
1088
1089struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1090 const char *uname, kuid_t n_uname,
1091 const char *aname)
1092{
1093 int err = 0;
1094 struct p9_req_t *req;
1095 struct p9_fid *fid;
1096 struct p9_qid qid;
1097
1098 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1099 afid ? afid->fid : -1, uname, aname);
1100 fid = p9_fid_create(clnt);
1101 if (!fid) {
1102 err = -ENOMEM;
1103 goto error;
1104 }
1105 fid->uid = n_uname;
1106
1107 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1108 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1109 if (IS_ERR(req)) {
1110 err = PTR_ERR(req);
1111 goto error;
1112 }
1113
1114 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid);
1115 if (err) {
1116 trace_9p_protocol_dump(clnt, &req->rc);
1117 p9_req_put(clnt, req);
1118 goto error;
1119 }
1120
1121 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1122 qid.type, qid.path, qid.version);
1123
1124 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1125
1126 p9_req_put(clnt, req);
1127 return fid;
1128
1129error:
1130 if (fid)
1131 p9_fid_destroy(fid);
1132 return ERR_PTR(err);
1133}
1134EXPORT_SYMBOL(p9_client_attach);
1135
1136struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1137 const unsigned char * const *wnames, int clone)
1138{
1139 int err;
1140 struct p9_client *clnt;
1141 struct p9_fid *fid;
1142 struct p9_qid *wqids;
1143 struct p9_req_t *req;
1144 u16 nwqids, count;
1145
1146 err = 0;
1147 wqids = NULL;
1148 clnt = oldfid->clnt;
1149 if (clone) {
1150 fid = p9_fid_create(clnt);
1151 if (!fid) {
1152 err = -ENOMEM;
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 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1164 nwname, wnames);
1165 if (IS_ERR(req)) {
1166 err = PTR_ERR(req);
1167 goto error;
1168 }
1169
1170 err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1171 if (err) {
1172 trace_9p_protocol_dump(clnt, &req->rc);
1173 p9_req_put(clnt, req);
1174 goto clunk_fid;
1175 }
1176 p9_req_put(clnt, req);
1177
1178 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1179
1180 if (nwqids != nwname) {
1181 err = -ENOENT;
1182 goto clunk_fid;
1183 }
1184
1185 for (count = 0; count < nwqids; count++)
1186 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1187 count, wqids[count].type,
1188 wqids[count].path,
1189 wqids[count].version);
1190
1191 if (nwname)
1192 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1193 else
1194 memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid));
1195
1196 kfree(wqids);
1197 return fid;
1198
1199clunk_fid:
1200 kfree(wqids);
1201 p9_fid_put(fid);
1202 fid = NULL;
1203
1204error:
1205 if (fid && fid != oldfid)
1206 p9_fid_destroy(fid);
1207
1208 return ERR_PTR(err);
1209}
1210EXPORT_SYMBOL(p9_client_walk);
1211
1212int p9_client_open(struct p9_fid *fid, int mode)
1213{
1214 int err;
1215 struct p9_client *clnt;
1216 struct p9_req_t *req;
1217 struct p9_qid qid;
1218 int iounit;
1219
1220 clnt = fid->clnt;
1221 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1222 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1223 err = 0;
1224
1225 if (fid->mode != -1)
1226 return -EINVAL;
1227
1228 if (p9_is_proto_dotl(clnt))
1229 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1230 else
1231 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1232 if (IS_ERR(req)) {
1233 err = PTR_ERR(req);
1234 goto error;
1235 }
1236
1237 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1238 if (err) {
1239 trace_9p_protocol_dump(clnt, &req->rc);
1240 goto free_and_error;
1241 }
1242
1243 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1244 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1245 qid.path, qid.version, iounit);
1246
1247 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1248 fid->mode = mode;
1249 fid->iounit = iounit;
1250
1251free_and_error:
1252 p9_req_put(clnt, req);
1253error:
1254 return err;
1255}
1256EXPORT_SYMBOL(p9_client_open);
1257
1258int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags,
1259 u32 mode, kgid_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,
1269 from_kgid(&init_user_ns, gid));
1270 clnt = ofid->clnt;
1271
1272 if (ofid->mode != -1)
1273 return -EINVAL;
1274
1275 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1276 mode, gid);
1277 if (IS_ERR(req)) {
1278 err = PTR_ERR(req);
1279 goto error;
1280 }
1281
1282 err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit);
1283 if (err) {
1284 trace_9p_protocol_dump(clnt, &req->rc);
1285 goto free_and_error;
1286 }
1287
1288 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1289 qid->type, qid->path, qid->version, iounit);
1290
1291 memmove(&ofid->qid, qid, sizeof(struct p9_qid));
1292 ofid->mode = mode;
1293 ofid->iounit = iounit;
1294
1295free_and_error:
1296 p9_req_put(clnt, req);
1297error:
1298 return err;
1299}
1300EXPORT_SYMBOL(p9_client_create_dotl);
1301
1302int p9_client_fcreate(struct p9_fid *fid, const 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, qid.path, qid.version, iounit);
1334
1335 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1336 fid->mode = mode;
1337 fid->iounit = iounit;
1338
1339free_and_error:
1340 p9_req_put(clnt, req);
1341error:
1342 return err;
1343}
1344EXPORT_SYMBOL(p9_client_fcreate);
1345
1346int p9_client_symlink(struct p9_fid *dfid, const char *name,
1347 const char *symtgt, kgid_t gid, struct p9_qid *qid)
1348{
1349 int err = 0;
1350 struct p9_client *clnt;
1351 struct p9_req_t *req;
1352
1353 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1354 dfid->fid, name, symtgt);
1355 clnt = dfid->clnt;
1356
1357 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1358 gid);
1359 if (IS_ERR(req)) {
1360 err = PTR_ERR(req);
1361 goto error;
1362 }
1363
1364 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
1365 if (err) {
1366 trace_9p_protocol_dump(clnt, &req->rc);
1367 goto free_and_error;
1368 }
1369
1370 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1371 qid->type, qid->path, qid->version);
1372
1373free_and_error:
1374 p9_req_put(clnt, req);
1375error:
1376 return err;
1377}
1378EXPORT_SYMBOL(p9_client_symlink);
1379
1380int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname)
1381{
1382 struct p9_client *clnt;
1383 struct p9_req_t *req;
1384
1385 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1386 dfid->fid, oldfid->fid, newname);
1387 clnt = dfid->clnt;
1388 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1389 newname);
1390 if (IS_ERR(req))
1391 return PTR_ERR(req);
1392
1393 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1394 p9_req_put(clnt, req);
1395 return 0;
1396}
1397EXPORT_SYMBOL(p9_client_link);
1398
1399int p9_client_fsync(struct p9_fid *fid, int datasync)
1400{
1401 int err;
1402 struct p9_client *clnt;
1403 struct p9_req_t *req;
1404
1405 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1406 fid->fid, datasync);
1407 err = 0;
1408 clnt = fid->clnt;
1409
1410 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1411 if (IS_ERR(req)) {
1412 err = PTR_ERR(req);
1413 goto error;
1414 }
1415
1416 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1417
1418 p9_req_put(clnt, req);
1419
1420error:
1421 return err;
1422}
1423EXPORT_SYMBOL(p9_client_fsync);
1424
1425int p9_client_clunk(struct p9_fid *fid)
1426{
1427 int err;
1428 struct p9_client *clnt;
1429 struct p9_req_t *req;
1430 int retries = 0;
1431
1432again:
1433 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n",
1434 fid->fid, retries);
1435 err = 0;
1436 clnt = fid->clnt;
1437
1438 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1439 if (IS_ERR(req)) {
1440 err = PTR_ERR(req);
1441 goto error;
1442 }
1443
1444 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1445
1446 p9_req_put(clnt, req);
1447error:
1448 /* Fid is not valid even after a failed clunk
1449 * If interrupted, retry once then give up and
1450 * leak fid until umount.
1451 */
1452 if (err == -ERESTARTSYS) {
1453 if (retries++ == 0)
1454 goto again;
1455 } else {
1456 p9_fid_destroy(fid);
1457 }
1458 return err;
1459}
1460EXPORT_SYMBOL(p9_client_clunk);
1461
1462int p9_client_remove(struct p9_fid *fid)
1463{
1464 int err;
1465 struct p9_client *clnt;
1466 struct p9_req_t *req;
1467
1468 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1469 err = 0;
1470 clnt = fid->clnt;
1471
1472 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1473 if (IS_ERR(req)) {
1474 err = PTR_ERR(req);
1475 goto error;
1476 }
1477
1478 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1479
1480 p9_req_put(clnt, req);
1481error:
1482 if (err == -ERESTARTSYS)
1483 p9_fid_put(fid);
1484 else
1485 p9_fid_destroy(fid);
1486 return err;
1487}
1488EXPORT_SYMBOL(p9_client_remove);
1489
1490int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1491{
1492 int err = 0;
1493 struct p9_req_t *req;
1494 struct p9_client *clnt;
1495
1496 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1497 dfid->fid, name, flags);
1498
1499 clnt = dfid->clnt;
1500 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1501 if (IS_ERR(req)) {
1502 err = PTR_ERR(req);
1503 goto error;
1504 }
1505 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1506
1507 p9_req_put(clnt, req);
1508error:
1509 return err;
1510}
1511EXPORT_SYMBOL(p9_client_unlinkat);
1512
1513int
1514p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
1515{
1516 int total = 0;
1517 *err = 0;
1518
1519 while (iov_iter_count(to)) {
1520 int count;
1521
1522 count = p9_client_read_once(fid, offset, to, err);
1523 if (!count || *err)
1524 break;
1525 offset += count;
1526 total += count;
1527 }
1528 return total;
1529}
1530EXPORT_SYMBOL(p9_client_read);
1531
1532int
1533p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to,
1534 int *err)
1535{
1536 struct p9_client *clnt = fid->clnt;
1537 struct p9_req_t *req;
1538 int count = iov_iter_count(to);
1539 int rsize, received, non_zc = 0;
1540 char *dataptr;
1541
1542 *err = 0;
1543 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %zu\n",
1544 fid->fid, offset, iov_iter_count(to));
1545
1546 rsize = fid->iounit;
1547 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ)
1548 rsize = clnt->msize - P9_IOHDRSZ;
1549
1550 if (count < rsize)
1551 rsize = count;
1552
1553 /* Don't bother zerocopy for small IO (< 1024) */
1554 if (clnt->trans_mod->zc_request && rsize > 1024) {
1555 /* response header len is 11
1556 * PDU Header(7) + IO Size (4)
1557 */
1558 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize,
1559 0, 11, "dqd", fid->fid,
1560 offset, rsize);
1561 } else {
1562 non_zc = 1;
1563 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1564 rsize);
1565 }
1566 if (IS_ERR(req)) {
1567 *err = PTR_ERR(req);
1568 if (!non_zc)
1569 iov_iter_revert(to, count - iov_iter_count(to));
1570 return 0;
1571 }
1572
1573 *err = p9pdu_readf(&req->rc, clnt->proto_version,
1574 "D", &received, &dataptr);
1575 if (*err) {
1576 if (!non_zc)
1577 iov_iter_revert(to, count - iov_iter_count(to));
1578 trace_9p_protocol_dump(clnt, &req->rc);
1579 p9_req_put(clnt, req);
1580 return 0;
1581 }
1582 if (rsize < received) {
1583 pr_err("bogus RREAD count (%d > %d)\n", received, rsize);
1584 received = rsize;
1585 }
1586
1587 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1588
1589 if (non_zc) {
1590 int n = copy_to_iter(dataptr, received, to);
1591
1592 if (n != received) {
1593 *err = -EFAULT;
1594 p9_req_put(clnt, req);
1595 return n;
1596 }
1597 } else {
1598 iov_iter_revert(to, count - received - iov_iter_count(to));
1599 }
1600 p9_req_put(clnt, req);
1601 return received;
1602}
1603EXPORT_SYMBOL(p9_client_read_once);
1604
1605int
1606p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
1607{
1608 struct p9_client *clnt = fid->clnt;
1609 struct p9_req_t *req;
1610 int total = 0;
1611 *err = 0;
1612
1613 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n",
1614 fid->fid, offset, iov_iter_count(from));
1615
1616 while (iov_iter_count(from)) {
1617 int count = iov_iter_count(from);
1618 int rsize = fid->iounit;
1619 int written;
1620
1621 if (!rsize || rsize > clnt->msize - P9_IOHDRSZ)
1622 rsize = clnt->msize - P9_IOHDRSZ;
1623
1624 if (count < rsize)
1625 rsize = count;
1626
1627 /* Don't bother zerocopy for small IO (< 1024) */
1628 if (clnt->trans_mod->zc_request && rsize > 1024) {
1629 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0,
1630 rsize, P9_ZC_HDR_SZ, "dqd",
1631 fid->fid, offset, rsize);
1632 } else {
1633 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
1634 offset, rsize, from);
1635 }
1636 if (IS_ERR(req)) {
1637 iov_iter_revert(from, count - iov_iter_count(from));
1638 *err = PTR_ERR(req);
1639 break;
1640 }
1641
1642 *err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &written);
1643 if (*err) {
1644 iov_iter_revert(from, count - iov_iter_count(from));
1645 trace_9p_protocol_dump(clnt, &req->rc);
1646 p9_req_put(clnt, req);
1647 break;
1648 }
1649 if (rsize < written) {
1650 pr_err("bogus RWRITE count (%d > %d)\n", written, rsize);
1651 written = rsize;
1652 }
1653
1654 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1655
1656 p9_req_put(clnt, req);
1657 iov_iter_revert(from, count - written - iov_iter_count(from));
1658 total += written;
1659 offset += written;
1660 }
1661 return total;
1662}
1663EXPORT_SYMBOL(p9_client_write);
1664
1665struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1666{
1667 int err;
1668 struct p9_client *clnt;
1669 struct p9_wstat *ret;
1670 struct p9_req_t *req;
1671 u16 ignored;
1672
1673 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1674
1675 ret = kmalloc(sizeof(*ret), GFP_KERNEL);
1676 if (!ret)
1677 return ERR_PTR(-ENOMEM);
1678
1679 err = 0;
1680 clnt = fid->clnt;
1681
1682 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1683 if (IS_ERR(req)) {
1684 err = PTR_ERR(req);
1685 goto error;
1686 }
1687
1688 err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret);
1689 if (err) {
1690 trace_9p_protocol_dump(clnt, &req->rc);
1691 p9_req_put(clnt, req);
1692 goto error;
1693 }
1694
1695 p9_debug(P9_DEBUG_9P,
1696 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1697 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1698 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1699 "<<< uid=%d gid=%d n_muid=%d\n",
1700 ret->size, ret->type, ret->dev, ret->qid.type, ret->qid.path,
1701 ret->qid.version, ret->mode,
1702 ret->atime, ret->mtime, ret->length,
1703 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1704 from_kuid(&init_user_ns, ret->n_uid),
1705 from_kgid(&init_user_ns, ret->n_gid),
1706 from_kuid(&init_user_ns, ret->n_muid));
1707
1708 p9_req_put(clnt, req);
1709 return ret;
1710
1711error:
1712 kfree(ret);
1713 return ERR_PTR(err);
1714}
1715EXPORT_SYMBOL(p9_client_stat);
1716
1717struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1718 u64 request_mask)
1719{
1720 int err;
1721 struct p9_client *clnt;
1722 struct p9_stat_dotl *ret;
1723 struct p9_req_t *req;
1724
1725 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1726 fid->fid, request_mask);
1727
1728 ret = kmalloc(sizeof(*ret), GFP_KERNEL);
1729 if (!ret)
1730 return ERR_PTR(-ENOMEM);
1731
1732 err = 0;
1733 clnt = fid->clnt;
1734
1735 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1736 if (IS_ERR(req)) {
1737 err = PTR_ERR(req);
1738 goto error;
1739 }
1740
1741 err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret);
1742 if (err) {
1743 trace_9p_protocol_dump(clnt, &req->rc);
1744 p9_req_put(clnt, req);
1745 goto error;
1746 }
1747
1748 p9_debug(P9_DEBUG_9P, "<<< RGETATTR st_result_mask=%lld\n"
1749 "<<< qid=%x.%llx.%x\n"
1750 "<<< st_mode=%8.8x st_nlink=%llu\n"
1751 "<<< st_uid=%d st_gid=%d\n"
1752 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1753 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1754 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1755 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1756 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1757 "<<< st_gen=%lld st_data_version=%lld\n",
1758 ret->st_result_mask,
1759 ret->qid.type, ret->qid.path, ret->qid.version,
1760 ret->st_mode, ret->st_nlink,
1761 from_kuid(&init_user_ns, ret->st_uid),
1762 from_kgid(&init_user_ns, ret->st_gid),
1763 ret->st_rdev, ret->st_size, ret->st_blksize, ret->st_blocks,
1764 ret->st_atime_sec, ret->st_atime_nsec,
1765 ret->st_mtime_sec, ret->st_mtime_nsec,
1766 ret->st_ctime_sec, ret->st_ctime_nsec,
1767 ret->st_btime_sec, ret->st_btime_nsec,
1768 ret->st_gen, ret->st_data_version);
1769
1770 p9_req_put(clnt, req);
1771 return ret;
1772
1773error:
1774 kfree(ret);
1775 return ERR_PTR(err);
1776}
1777EXPORT_SYMBOL(p9_client_getattr_dotl);
1778
1779static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1780{
1781 int ret;
1782
1783 /* NOTE: size shouldn't include its own length */
1784 /* size[2] type[2] dev[4] qid[13] */
1785 /* mode[4] atime[4] mtime[4] length[8]*/
1786 /* name[s] uid[s] gid[s] muid[s] */
1787 ret = 2 + 4 + 13 + 4 + 4 + 4 + 8 + 2 + 2 + 2 + 2;
1788
1789 if (wst->name)
1790 ret += strlen(wst->name);
1791 if (wst->uid)
1792 ret += strlen(wst->uid);
1793 if (wst->gid)
1794 ret += strlen(wst->gid);
1795 if (wst->muid)
1796 ret += strlen(wst->muid);
1797
1798 if (proto_version == p9_proto_2000u ||
1799 proto_version == p9_proto_2000L) {
1800 /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1801 ret += 2 + 4 + 4 + 4;
1802 if (wst->extension)
1803 ret += strlen(wst->extension);
1804 }
1805
1806 return ret;
1807}
1808
1809int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1810{
1811 int err;
1812 struct p9_req_t *req;
1813 struct p9_client *clnt;
1814
1815 err = 0;
1816 clnt = fid->clnt;
1817 wst->size = p9_client_statsize(wst, clnt->proto_version);
1818 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n",
1819 fid->fid);
1820 p9_debug(P9_DEBUG_9P,
1821 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1822 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1823 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1824 " uid=%d gid=%d n_muid=%d\n",
1825 wst->size, wst->type, wst->dev, wst->qid.type,
1826 wst->qid.path, wst->qid.version,
1827 wst->mode, wst->atime, wst->mtime, wst->length,
1828 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1829 from_kuid(&init_user_ns, wst->n_uid),
1830 from_kgid(&init_user_ns, wst->n_gid),
1831 from_kuid(&init_user_ns, wst->n_muid));
1832
1833 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS",
1834 fid->fid, wst->size + 2, wst);
1835 if (IS_ERR(req)) {
1836 err = PTR_ERR(req);
1837 goto error;
1838 }
1839
1840 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1841
1842 p9_req_put(clnt, req);
1843error:
1844 return err;
1845}
1846EXPORT_SYMBOL(p9_client_wstat);
1847
1848int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1849{
1850 int err;
1851 struct p9_req_t *req;
1852 struct p9_client *clnt;
1853
1854 err = 0;
1855 clnt = fid->clnt;
1856 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1857 p9_debug(P9_DEBUG_9P, " valid=%x mode=%x uid=%d gid=%d size=%lld\n",
1858 p9attr->valid, p9attr->mode,
1859 from_kuid(&init_user_ns, p9attr->uid),
1860 from_kgid(&init_user_ns, p9attr->gid),
1861 p9attr->size);
1862 p9_debug(P9_DEBUG_9P, " atime_sec=%lld atime_nsec=%lld\n",
1863 p9attr->atime_sec, p9attr->atime_nsec);
1864 p9_debug(P9_DEBUG_9P, " mtime_sec=%lld mtime_nsec=%lld\n",
1865 p9attr->mtime_sec, p9attr->mtime_nsec);
1866
1867 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1868
1869 if (IS_ERR(req)) {
1870 err = PTR_ERR(req);
1871 goto error;
1872 }
1873 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1874 p9_req_put(clnt, req);
1875error:
1876 return err;
1877}
1878EXPORT_SYMBOL(p9_client_setattr);
1879
1880int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1881{
1882 int err;
1883 struct p9_req_t *req;
1884 struct p9_client *clnt;
1885
1886 err = 0;
1887 clnt = fid->clnt;
1888
1889 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1890
1891 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1892 if (IS_ERR(req)) {
1893 err = PTR_ERR(req);
1894 goto error;
1895 }
1896
1897 err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1898 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1899 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1900 if (err) {
1901 trace_9p_protocol_dump(clnt, &req->rc);
1902 p9_req_put(clnt, req);
1903 goto error;
1904 }
1905
1906 p9_debug(P9_DEBUG_9P,
1907 "<<< RSTATFS fid %d type 0x%x bsize %u blocks %llu bfree %llu bavail %llu files %llu ffree %llu fsid %llu namelen %u\n",
1908 fid->fid, sb->type, sb->bsize, sb->blocks, sb->bfree,
1909 sb->bavail, sb->files, sb->ffree, sb->fsid, sb->namelen);
1910
1911 p9_req_put(clnt, req);
1912error:
1913 return err;
1914}
1915EXPORT_SYMBOL(p9_client_statfs);
1916
1917int p9_client_rename(struct p9_fid *fid,
1918 struct p9_fid *newdirfid, const char *name)
1919{
1920 int err;
1921 struct p9_req_t *req;
1922 struct p9_client *clnt;
1923
1924 err = 0;
1925 clnt = fid->clnt;
1926
1927 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1928 fid->fid, newdirfid->fid, name);
1929
1930 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1931 newdirfid->fid, name);
1932 if (IS_ERR(req)) {
1933 err = PTR_ERR(req);
1934 goto error;
1935 }
1936
1937 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1938
1939 p9_req_put(clnt, req);
1940error:
1941 return err;
1942}
1943EXPORT_SYMBOL(p9_client_rename);
1944
1945int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1946 struct p9_fid *newdirfid, const char *new_name)
1947{
1948 int err;
1949 struct p9_req_t *req;
1950 struct p9_client *clnt;
1951
1952 err = 0;
1953 clnt = olddirfid->clnt;
1954
1955 p9_debug(P9_DEBUG_9P,
1956 ">>> TRENAMEAT olddirfid %d old name %s newdirfid %d new name %s\n",
1957 olddirfid->fid, old_name, newdirfid->fid, new_name);
1958
1959 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1960 old_name, newdirfid->fid, new_name);
1961 if (IS_ERR(req)) {
1962 err = PTR_ERR(req);
1963 goto error;
1964 }
1965
1966 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1967 newdirfid->fid, new_name);
1968
1969 p9_req_put(clnt, req);
1970error:
1971 return err;
1972}
1973EXPORT_SYMBOL(p9_client_renameat);
1974
1975/* An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1976 */
1977struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1978 const char *attr_name, u64 *attr_size)
1979{
1980 int err;
1981 struct p9_req_t *req;
1982 struct p9_client *clnt;
1983 struct p9_fid *attr_fid;
1984
1985 err = 0;
1986 clnt = file_fid->clnt;
1987 attr_fid = p9_fid_create(clnt);
1988 if (!attr_fid) {
1989 err = -ENOMEM;
1990 goto error;
1991 }
1992 p9_debug(P9_DEBUG_9P,
1993 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
1994 file_fid->fid, attr_fid->fid, attr_name);
1995
1996 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
1997 file_fid->fid, attr_fid->fid, attr_name);
1998 if (IS_ERR(req)) {
1999 err = PTR_ERR(req);
2000 goto error;
2001 }
2002 err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size);
2003 if (err) {
2004 trace_9p_protocol_dump(clnt, &req->rc);
2005 p9_req_put(clnt, req);
2006 goto clunk_fid;
2007 }
2008 p9_req_put(clnt, req);
2009 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2010 attr_fid->fid, *attr_size);
2011 return attr_fid;
2012clunk_fid:
2013 p9_fid_put(attr_fid);
2014 attr_fid = NULL;
2015error:
2016 if (attr_fid && attr_fid != file_fid)
2017 p9_fid_destroy(attr_fid);
2018
2019 return ERR_PTR(err);
2020}
2021EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2022
2023int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2024 u64 attr_size, int flags)
2025{
2026 int err;
2027 struct p9_req_t *req;
2028 struct p9_client *clnt;
2029
2030 p9_debug(P9_DEBUG_9P,
2031 ">>> TXATTRCREATE fid %d name %s size %llu flag %d\n",
2032 fid->fid, name, attr_size, flags);
2033 err = 0;
2034 clnt = fid->clnt;
2035 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2036 fid->fid, name, attr_size, flags);
2037 if (IS_ERR(req)) {
2038 err = PTR_ERR(req);
2039 goto error;
2040 }
2041 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2042 p9_req_put(clnt, req);
2043error:
2044 return err;
2045}
2046EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2047
2048int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2049{
2050 int err, rsize, non_zc = 0;
2051 struct p9_client *clnt;
2052 struct p9_req_t *req;
2053 char *dataptr;
2054 struct kvec kv = {.iov_base = data, .iov_len = count};
2055 struct iov_iter to;
2056
2057 iov_iter_kvec(&to, ITER_DEST, &kv, 1, count);
2058
2059 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2060 fid->fid, offset, count);
2061
2062 err = 0;
2063 clnt = fid->clnt;
2064
2065 rsize = fid->iounit;
2066 if (!rsize || rsize > clnt->msize - P9_READDIRHDRSZ)
2067 rsize = clnt->msize - P9_READDIRHDRSZ;
2068
2069 if (count < rsize)
2070 rsize = count;
2071
2072 /* Don't bother zerocopy for small IO (< 1024) */
2073 if (clnt->trans_mod->zc_request && rsize > 1024) {
2074 /* response header len is 11
2075 * PDU Header(7) + IO Size (4)
2076 */
2077 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0,
2078 11, "dqd", fid->fid, offset, rsize);
2079 } else {
2080 non_zc = 1;
2081 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2082 offset, rsize);
2083 }
2084 if (IS_ERR(req)) {
2085 err = PTR_ERR(req);
2086 goto error;
2087 }
2088
2089 err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr);
2090 if (err) {
2091 trace_9p_protocol_dump(clnt, &req->rc);
2092 goto free_and_error;
2093 }
2094 if (rsize < count) {
2095 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize);
2096 count = rsize;
2097 }
2098
2099 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2100
2101 if (non_zc)
2102 memmove(data, dataptr, count);
2103
2104 p9_req_put(clnt, req);
2105 return count;
2106
2107free_and_error:
2108 p9_req_put(clnt, req);
2109error:
2110 return err;
2111}
2112EXPORT_SYMBOL(p9_client_readdir);
2113
2114int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode,
2115 dev_t rdev, kgid_t gid, struct p9_qid *qid)
2116{
2117 int err;
2118 struct p9_client *clnt;
2119 struct p9_req_t *req;
2120
2121 err = 0;
2122 clnt = fid->clnt;
2123 p9_debug(P9_DEBUG_9P,
2124 ">>> TMKNOD fid %d name %s mode %d major %d minor %d\n",
2125 fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2126 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2127 MAJOR(rdev), MINOR(rdev), gid);
2128 if (IS_ERR(req))
2129 return PTR_ERR(req);
2130
2131 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
2132 if (err) {
2133 trace_9p_protocol_dump(clnt, &req->rc);
2134 goto error;
2135 }
2136 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n",
2137 qid->type, qid->path, qid->version);
2138
2139error:
2140 p9_req_put(clnt, req);
2141 return err;
2142}
2143EXPORT_SYMBOL(p9_client_mknod_dotl);
2144
2145int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode,
2146 kgid_t gid, struct p9_qid *qid)
2147{
2148 int err;
2149 struct p9_client *clnt;
2150 struct p9_req_t *req;
2151
2152 err = 0;
2153 clnt = fid->clnt;
2154 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2155 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2156 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg",
2157 fid->fid, name, mode, gid);
2158 if (IS_ERR(req))
2159 return PTR_ERR(req);
2160
2161 err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid);
2162 if (err) {
2163 trace_9p_protocol_dump(clnt, &req->rc);
2164 goto error;
2165 }
2166 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2167 qid->path, qid->version);
2168
2169error:
2170 p9_req_put(clnt, req);
2171 return err;
2172}
2173EXPORT_SYMBOL(p9_client_mkdir_dotl);
2174
2175int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2176{
2177 int err;
2178 struct p9_client *clnt;
2179 struct p9_req_t *req;
2180
2181 err = 0;
2182 clnt = fid->clnt;
2183 p9_debug(P9_DEBUG_9P,
2184 ">>> TLOCK fid %d type %i flags %d start %lld length %lld proc_id %d client_id %s\n",
2185 fid->fid, flock->type, flock->flags, flock->start,
2186 flock->length, flock->proc_id, flock->client_id);
2187
2188 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2189 flock->flags, flock->start, flock->length,
2190 flock->proc_id, flock->client_id);
2191
2192 if (IS_ERR(req))
2193 return PTR_ERR(req);
2194
2195 err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status);
2196 if (err) {
2197 trace_9p_protocol_dump(clnt, &req->rc);
2198 goto error;
2199 }
2200 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2201error:
2202 p9_req_put(clnt, req);
2203 return err;
2204}
2205EXPORT_SYMBOL(p9_client_lock_dotl);
2206
2207int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2208{
2209 int err;
2210 struct p9_client *clnt;
2211 struct p9_req_t *req;
2212
2213 err = 0;
2214 clnt = fid->clnt;
2215 p9_debug(P9_DEBUG_9P,
2216 ">>> TGETLOCK fid %d, type %i start %lld length %lld proc_id %d client_id %s\n",
2217 fid->fid, glock->type, glock->start, glock->length,
2218 glock->proc_id, glock->client_id);
2219
2220 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid,
2221 glock->type, glock->start, glock->length,
2222 glock->proc_id, glock->client_id);
2223
2224 if (IS_ERR(req))
2225 return PTR_ERR(req);
2226
2227 err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type,
2228 &glock->start, &glock->length, &glock->proc_id,
2229 &glock->client_id);
2230 if (err) {
2231 trace_9p_protocol_dump(clnt, &req->rc);
2232 goto error;
2233 }
2234 p9_debug(P9_DEBUG_9P,
2235 "<<< RGETLOCK type %i start %lld length %lld proc_id %d client_id %s\n",
2236 glock->type, glock->start, glock->length,
2237 glock->proc_id, glock->client_id);
2238error:
2239 p9_req_put(clnt, req);
2240 return err;
2241}
2242EXPORT_SYMBOL(p9_client_getlock_dotl);
2243
2244int p9_client_readlink(struct p9_fid *fid, char **target)
2245{
2246 int err;
2247 struct p9_client *clnt;
2248 struct p9_req_t *req;
2249
2250 err = 0;
2251 clnt = fid->clnt;
2252 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2253
2254 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2255 if (IS_ERR(req))
2256 return PTR_ERR(req);
2257
2258 err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target);
2259 if (err) {
2260 trace_9p_protocol_dump(clnt, &req->rc);
2261 goto error;
2262 }
2263 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2264error:
2265 p9_req_put(clnt, req);
2266 return err;
2267}
2268EXPORT_SYMBOL(p9_client_readlink);
2269
2270int __init p9_client_init(void)
2271{
2272 p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU);
2273 return p9_req_cache ? 0 : -ENOMEM;
2274}
2275
2276void __exit p9_client_exit(void)
2277{
2278 kmem_cache_destroy(p9_req_cache);
2279}