]> git.proxmox.com Git - mirror_ubuntu-focal-kernel.git/blob - net/9p/client.c
projects / mirror_ubuntu-focal-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge tag 'drm-misc-next-fixes-2018-08-23-1' of git://anongit.freedesktop.org/drm...
[mirror_ubuntu-focal-kernel.git] / net / 9p / client.c
1 /*
2 * net/9p/clnt.c
3 *
4 * 9P Client
5 *
6 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to:
20 * Free Software Foundation
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02111-1301 USA
23 *
24 */
25
26 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
27
28 #include <linux/module.h>
29 #include <linux/errno.h>
30 #include <linux/fs.h>
31 #include <linux/poll.h>
32 #include <linux/idr.h>
33 #include <linux/mutex.h>
34 #include <linux/slab.h>
35 #include <linux/sched/signal.h>
36 #include <linux/uaccess.h>
37 #include <linux/uio.h>
38 #include <net/9p/9p.h>
39 #include <linux/parser.h>
40 #include <linux/seq_file.h>
41 #include <net/9p/client.h>
42 #include <net/9p/transport.h>
43 #include "protocol.h"
44
45 #define CREATE_TRACE_POINTS
46 #include <trace/events/9p.h>
47
48 /*
49 * Client Option Parsing (code inspired by NFS code)
50 * - a little lazy - parse all client options
51 */
52
53 enum {
54 Opt_msize,
55 Opt_trans,
56 Opt_legacy,
57 Opt_version,
58 Opt_err,
59 };
60
61 static const match_table_t tokens = {
62 {Opt_msize, "msize=%u"},
63 {Opt_legacy, "noextend"},
64 {Opt_trans, "trans=%s"},
65 {Opt_version, "version=%s"},
66 {Opt_err, NULL},
67 };
68
69 inline int p9_is_proto_dotl(struct p9_client *clnt)
70 {
71 return clnt->proto_version == p9_proto_2000L;
72 }
73 EXPORT_SYMBOL(p9_is_proto_dotl);
74
75 inline int p9_is_proto_dotu(struct p9_client *clnt)
76 {
77 return clnt->proto_version == p9_proto_2000u;
78 }
79 EXPORT_SYMBOL(p9_is_proto_dotu);
80
81 int p9_show_client_options(struct seq_file *m, struct p9_client *clnt)
82 {
83 if (clnt->msize != 8192)
84 seq_printf(m, ",msize=%u", clnt->msize);
85 seq_printf(m, ",trans=%s", clnt->trans_mod->name);
86
87 switch (clnt->proto_version) {
88 case p9_proto_legacy:
89 seq_puts(m, ",noextend");
90 break;
91 case p9_proto_2000u:
92 seq_puts(m, ",version=9p2000.u");
93 break;
94 case p9_proto_2000L:
95 /* Default */
96 break;
97 }
98
99 if (clnt->trans_mod->show_options)
100 return clnt->trans_mod->show_options(m, clnt);
101 return 0;
102 }
103 EXPORT_SYMBOL(p9_show_client_options);
104
105 /*
106 * Some error codes are taken directly from the server replies,
107 * make sure they are valid.
108 */
109 static int safe_errno(int err)
110 {
111 if ((err > 0) || (err < -MAX_ERRNO)) {
112 p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err);
113 return -EPROTO;
114 }
115 return err;
116 }
117
118
119 /* Interpret mount option for protocol version */
120 static int get_protocol_version(char *s)
121 {
122 int version = -EINVAL;
123
124 if (!strcmp(s, "9p2000")) {
125 version = p9_proto_legacy;
126 p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n");
127 } else if (!strcmp(s, "9p2000.u")) {
128 version = p9_proto_2000u;
129 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
130 } else if (!strcmp(s, "9p2000.L")) {
131 version = p9_proto_2000L;
132 p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
133 } else
134 pr_info("Unknown protocol version %s\n", s);
135
136 return version;
137 }
138
139 /**
140 * parse_options - parse mount options into client structure
141 * @opts: options string passed from mount
142 * @clnt: existing v9fs client information
143 *
144 * Return 0 upon success, -ERRNO upon failure
145 */
146
147 static int parse_opts(char *opts, struct p9_client *clnt)
148 {
149 char *options, *tmp_options;
150 char *p;
151 substring_t args[MAX_OPT_ARGS];
152 int option;
153 char *s;
154 int ret = 0;
155
156 clnt->proto_version = p9_proto_2000L;
157 clnt->msize = 8192;
158
159 if (!opts)
160 return 0;
161
162 tmp_options = kstrdup(opts, GFP_KERNEL);
163 if (!tmp_options) {
164 p9_debug(P9_DEBUG_ERROR,
165 "failed to allocate copy of option string\n");
166 return -ENOMEM;
167 }
168 options = tmp_options;
169
170 while ((p = strsep(&options, ",")) != NULL) {
171 int token, r;
172 if (!*p)
173 continue;
174 token = match_token(p, tokens, args);
175 switch (token) {
176 case Opt_msize:
177 r = match_int(&args[0], &option);
178 if (r < 0) {
179 p9_debug(P9_DEBUG_ERROR,
180 "integer field, but no integer?\n");
181 ret = r;
182 continue;
183 }
184 clnt->msize = option;
185 break;
186 case Opt_trans:
187 s = match_strdup(&args[0]);
188 if (!s) {
189 ret = -ENOMEM;
190 p9_debug(P9_DEBUG_ERROR,
191 "problem allocating copy of trans arg\n");
192 goto free_and_return;
193 }
194
195 v9fs_put_trans(clnt->trans_mod);
196 clnt->trans_mod = v9fs_get_trans_by_name(s);
197 if (clnt->trans_mod == NULL) {
198 pr_info("Could not find request transport: %s\n",
199 s);
200 ret = -EINVAL;
201 }
202 kfree(s);
203 break;
204 case Opt_legacy:
205 clnt->proto_version = p9_proto_legacy;
206 break;
207 case Opt_version:
208 s = match_strdup(&args[0]);
209 if (!s) {
210 ret = -ENOMEM;
211 p9_debug(P9_DEBUG_ERROR,
212 "problem allocating copy of version arg\n");
213 goto free_and_return;
214 }
215 r = get_protocol_version(s);
216 if (r < 0)
217 ret = r;
218 else
219 clnt->proto_version = r;
220 kfree(s);
221 break;
222 default:
223 continue;
224 }
225 }
226
227 free_and_return:
228 if (ret)
229 v9fs_put_trans(clnt->trans_mod);
230 kfree(tmp_options);
231 return ret;
232 }
233
234 static struct p9_fcall *p9_fcall_alloc(int alloc_msize)
235 {
236 struct p9_fcall *fc;
237 fc = kmalloc(sizeof(struct p9_fcall) + alloc_msize, GFP_NOFS);
238 if (!fc)
239 return NULL;
240 fc->capacity = alloc_msize;
241 fc->sdata = (char *) fc + sizeof(struct p9_fcall);
242 return fc;
243 }
244
245 /**
246 * p9_tag_alloc - lookup/allocate a request by tag
247 * @c: client session to lookup tag within
248 * @tag: numeric id for transaction
249 *
250 * this is a simple array lookup, but will grow the
251 * request_slots as necessary to accommodate transaction
252 * ids which did not previously have a slot.
253 *
254 * this code relies on the client spinlock to manage locks, its
255 * possible we should switch to something else, but I'd rather
256 * stick with something low-overhead for the common case.
257 *
258 */
259
260 static struct p9_req_t *
261 p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
262 {
263 unsigned long flags;
264 int row, col;
265 struct p9_req_t *req;
266 int alloc_msize = min(c->msize, max_size);
267
268 /* This looks up the original request by tag so we know which
269 * buffer to read the data into */
270 tag++;
271
272 if (tag >= c->max_tag) {
273 spin_lock_irqsave(&c->lock, flags);
274 /* check again since original check was outside of lock */
275 while (tag >= c->max_tag) {
276 row = (tag / P9_ROW_MAXTAG);
277 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
278 sizeof(struct p9_req_t), GFP_ATOMIC);
279
280 if (!c->reqs[row]) {
281 pr_err("Couldn't grow tag array\n");
282 spin_unlock_irqrestore(&c->lock, flags);
283 return ERR_PTR(-ENOMEM);
284 }
285 for (col = 0; col < P9_ROW_MAXTAG; col++) {
286 c->reqs[row][col].status = REQ_STATUS_IDLE;
287 c->reqs[row][col].tc = NULL;
288 }
289 c->max_tag += P9_ROW_MAXTAG;
290 }
291 spin_unlock_irqrestore(&c->lock, flags);
292 }
293 row = tag / P9_ROW_MAXTAG;
294 col = tag % P9_ROW_MAXTAG;
295
296 req = &c->reqs[row][col];
297 if (!req->wq) {
298 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
299 if (!req->wq)
300 goto grow_failed;
301 init_waitqueue_head(req->wq);
302 }
303
304 if (!req->tc)
305 req->tc = p9_fcall_alloc(alloc_msize);
306 if (!req->rc)
307 req->rc = p9_fcall_alloc(alloc_msize);
308 if (!req->tc || !req->rc)
309 goto grow_failed;
310
311 p9pdu_reset(req->tc);
312 p9pdu_reset(req->rc);
313
314 req->tc->tag = tag-1;
315 req->status = REQ_STATUS_ALLOC;
316
317 return req;
318
319 grow_failed:
320 pr_err("Couldn't grow tag array\n");
321 kfree(req->tc);
322 kfree(req->rc);
323 kfree(req->wq);
324 req->tc = req->rc = NULL;
325 req->wq = NULL;
326 return ERR_PTR(-ENOMEM);
327 }
328
329 /**
330 * p9_tag_lookup - lookup a request by tag
331 * @c: client session to lookup tag within
332 * @tag: numeric id for transaction
333 *
334 */
335
336 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
337 {
338 int row, col;
339
340 /* This looks up the original request by tag so we know which
341 * buffer to read the data into */
342 tag++;
343
344 if(tag >= c->max_tag)
345 return NULL;
346
347 row = tag / P9_ROW_MAXTAG;
348 col = tag % P9_ROW_MAXTAG;
349
350 return &c->reqs[row][col];
351 }
352 EXPORT_SYMBOL(p9_tag_lookup);
353
354 /**
355 * p9_tag_init - setup tags structure and contents
356 * @c: v9fs client struct
357 *
358 * This initializes the tags structure for each client instance.
359 *
360 */
361
362 static int p9_tag_init(struct p9_client *c)
363 {
364 int err = 0;
365
366 c->tagpool = p9_idpool_create();
367 if (IS_ERR(c->tagpool)) {
368 err = PTR_ERR(c->tagpool);
369 goto error;
370 }
371 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
372 if (err < 0) {
373 p9_idpool_destroy(c->tagpool);
374 goto error;
375 }
376 c->max_tag = 0;
377 error:
378 return err;
379 }
380
381 /**
382 * p9_tag_cleanup - cleans up tags structure and reclaims resources
383 * @c: v9fs client struct
384 *
385 * This frees resources associated with the tags structure
386 *
387 */
388 static void p9_tag_cleanup(struct p9_client *c)
389 {
390 int row, col;
391
392 /* check to insure all requests are idle */
393 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
394 for (col = 0; col < P9_ROW_MAXTAG; col++) {
395 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
396 p9_debug(P9_DEBUG_MUX,
397 "Attempting to cleanup non-free tag %d,%d\n",
398 row, col);
399 /* TODO: delay execution of cleanup */
400 return;
401 }
402 }
403 }
404
405 if (c->tagpool) {
406 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
407 p9_idpool_destroy(c->tagpool);
408 }
409
410 /* free requests associated with tags */
411 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
412 for (col = 0; col < P9_ROW_MAXTAG; col++) {
413 kfree(c->reqs[row][col].wq);
414 kfree(c->reqs[row][col].tc);
415 kfree(c->reqs[row][col].rc);
416 }
417 kfree(c->reqs[row]);
418 }
419 c->max_tag = 0;
420 }
421
422 /**
423 * p9_free_req - free a request and clean-up as necessary
424 * c: client state
425 * r: request to release
426 *
427 */
428
429 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
430 {
431 int tag = r->tc->tag;
432 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
433
434 r->status = REQ_STATUS_IDLE;
435 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
436 p9_idpool_put(tag, c->tagpool);
437 }
438
439 /**
440 * p9_client_cb - call back from transport to client
441 * c: client state
442 * req: request received
443 *
444 */
445 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status)
446 {
447 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
448
449 /*
450 * This barrier is needed to make sure any change made to req before
451 * the other thread wakes up will indeed be seen by the waiting side.
452 */
453 smp_wmb();
454 req->status = status;
455
456 wake_up(req->wq);
457 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
458 }
459 EXPORT_SYMBOL(p9_client_cb);
460
461 /**
462 * p9_parse_header - parse header arguments out of a packet
463 * @pdu: packet to parse
464 * @size: size of packet
465 * @type: type of request
466 * @tag: tag of packet
467 * @rewind: set if we need to rewind offset afterwards
468 */
469
470 int
471 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
472 int rewind)
473 {
474 int8_t r_type;
475 int16_t r_tag;
476 int32_t r_size;
477 int offset = pdu->offset;
478 int err;
479
480 pdu->offset = 0;
481 if (pdu->size == 0)
482 pdu->size = 7;
483
484 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
485 if (err)
486 goto rewind_and_exit;
487
488 pdu->size = r_size;
489 pdu->id = r_type;
490 pdu->tag = r_tag;
491
492 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
493 pdu->size, pdu->id, pdu->tag);
494
495 if (type)
496 *type = r_type;
497 if (tag)
498 *tag = r_tag;
499 if (size)
500 *size = r_size;
501
502
503 rewind_and_exit:
504 if (rewind)
505 pdu->offset = offset;
506 return err;
507 }
508 EXPORT_SYMBOL(p9_parse_header);
509
510 /**
511 * p9_check_errors - check 9p packet for error return and process it
512 * @c: current client instance
513 * @req: request to parse and check for error conditions
514 *
515 * returns error code if one is discovered, otherwise returns 0
516 *
517 * this will have to be more complicated if we have multiple
518 * error packet types
519 */
520
521 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
522 {
523 int8_t type;
524 int err;
525 int ecode;
526
527 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
528 /*
529 * dump the response from server
530 * This should be after check errors which poplulate pdu_fcall.
531 */
532 trace_9p_protocol_dump(c, req->rc);
533 if (err) {
534 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
535 return err;
536 }
537 if (type != P9_RERROR && type != P9_RLERROR)
538 return 0;
539
540 if (!p9_is_proto_dotl(c)) {
541 char *ename;
542 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
543 &ename, &ecode);
544 if (err)
545 goto out_err;
546
547 if (p9_is_proto_dotu(c) && ecode < 512)
548 err = -ecode;
549
550 if (!err) {
551 err = p9_errstr2errno(ename, strlen(ename));
552
553 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
554 -ecode, ename);
555 }
556 kfree(ename);
557 } else {
558 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
559 err = -ecode;
560
561 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
562 }
563
564 return err;
565
566 out_err:
567 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
568
569 return err;
570 }
571
572 /**
573 * p9_check_zc_errors - check 9p packet for error return and process it
574 * @c: current client instance
575 * @req: request to parse and check for error conditions
576 * @in_hdrlen: Size of response protocol buffer.
577 *
578 * returns error code if one is discovered, otherwise returns 0
579 *
580 * this will have to be more complicated if we have multiple
581 * error packet types
582 */
583
584 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
585 struct iov_iter *uidata, int in_hdrlen)
586 {
587 int err;
588 int ecode;
589 int8_t type;
590 char *ename = NULL;
591
592 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
593 /*
594 * dump the response from server
595 * This should be after parse_header which poplulate pdu_fcall.
596 */
597 trace_9p_protocol_dump(c, req->rc);
598 if (err) {
599 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
600 return err;
601 }
602
603 if (type != P9_RERROR && type != P9_RLERROR)
604 return 0;
605
606 if (!p9_is_proto_dotl(c)) {
607 /* Error is reported in string format */
608 int len;
609 /* 7 = header size for RERROR; */
610 int inline_len = in_hdrlen - 7;
611
612 len = req->rc->size - req->rc->offset;
613 if (len > (P9_ZC_HDR_SZ - 7)) {
614 err = -EFAULT;
615 goto out_err;
616 }
617
618 ename = &req->rc->sdata[req->rc->offset];
619 if (len > inline_len) {
620 /* We have error in external buffer */
621 if (!copy_from_iter_full(ename + inline_len,
622 len - inline_len, uidata)) {
623 err = -EFAULT;
624 goto out_err;
625 }
626 }
627 ename = NULL;
628 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
629 &ename, &ecode);
630 if (err)
631 goto out_err;
632
633 if (p9_is_proto_dotu(c) && ecode < 512)
634 err = -ecode;
635
636 if (!err) {
637 err = p9_errstr2errno(ename, strlen(ename));
638
639 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
640 -ecode, ename);
641 }
642 kfree(ename);
643 } else {
644 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
645 err = -ecode;
646
647 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
648 }
649 return err;
650
651 out_err:
652 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
653 return err;
654 }
655
656 static struct p9_req_t *
657 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
658
659 /**
660 * p9_client_flush - flush (cancel) a request
661 * @c: client state
662 * @oldreq: request to cancel
663 *
664 * This sents a flush for a particular request and links
665 * the flush request to the original request. The current
666 * code only supports a single flush request although the protocol
667 * allows for multiple flush requests to be sent for a single request.
668 *
669 */
670
671 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
672 {
673 struct p9_req_t *req;
674 int16_t oldtag;
675 int err;
676
677 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
678 if (err)
679 return err;
680
681 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
682
683 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
684 if (IS_ERR(req))
685 return PTR_ERR(req);
686
687 /*
688 * if we haven't received a response for oldreq,
689 * remove it from the list
690 */
691 if (oldreq->status == REQ_STATUS_SENT)
692 if (c->trans_mod->cancelled)
693 c->trans_mod->cancelled(c, oldreq);
694
695 p9_free_req(c, req);
696 return 0;
697 }
698
699 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
700 int8_t type, int req_size,
701 const char *fmt, va_list ap)
702 {
703 int tag, err;
704 struct p9_req_t *req;
705
706 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
707
708 /* we allow for any status other than disconnected */
709 if (c->status == Disconnected)
710 return ERR_PTR(-EIO);
711
712 /* if status is begin_disconnected we allow only clunk request */
713 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
714 return ERR_PTR(-EIO);
715
716 tag = P9_NOTAG;
717 if (type != P9_TVERSION) {
718 tag = p9_idpool_get(c->tagpool);
719 if (tag < 0)
720 return ERR_PTR(-ENOMEM);
721 }
722
723 req = p9_tag_alloc(c, tag, req_size);
724 if (IS_ERR(req))
725 return req;
726
727 /* marshall the data */
728 p9pdu_prepare(req->tc, tag, type);
729 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
730 if (err)
731 goto reterr;
732 p9pdu_finalize(c, req->tc);
733 trace_9p_client_req(c, type, tag);
734 return req;
735 reterr:
736 p9_free_req(c, req);
737 return ERR_PTR(err);
738 }
739
740 /**
741 * p9_client_rpc - issue a request and wait for a response
742 * @c: client session
743 * @type: type of request
744 * @fmt: protocol format string (see protocol.c)
745 *
746 * Returns request structure (which client must free using p9_free_req)
747 */
748
749 static struct p9_req_t *
750 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
751 {
752 va_list ap;
753 int sigpending, err;
754 unsigned long flags;
755 struct p9_req_t *req;
756
757 va_start(ap, fmt);
758 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
759 va_end(ap);
760 if (IS_ERR(req))
761 return req;
762
763 if (signal_pending(current)) {
764 sigpending = 1;
765 clear_thread_flag(TIF_SIGPENDING);
766 } else
767 sigpending = 0;
768
769 err = c->trans_mod->request(c, req);
770 if (err < 0) {
771 if (err != -ERESTARTSYS && err != -EFAULT)
772 c->status = Disconnected;
773 goto recalc_sigpending;
774 }
775 again:
776 /* Wait for the response */
777 err = wait_event_killable(*req->wq, req->status >= REQ_STATUS_RCVD);
778
779 /*
780 * Make sure our req is coherent with regard to updates in other
781 * threads - echoes to wmb() in the callback
782 */
783 smp_rmb();
784
785 if ((err == -ERESTARTSYS) && (c->status == Connected)
786 && (type == P9_TFLUSH)) {
787 sigpending = 1;
788 clear_thread_flag(TIF_SIGPENDING);
789 goto again;
790 }
791
792 if (req->status == REQ_STATUS_ERROR) {
793 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
794 err = req->t_err;
795 }
796 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
797 p9_debug(P9_DEBUG_MUX, "flushing\n");
798 sigpending = 1;
799 clear_thread_flag(TIF_SIGPENDING);
800
801 if (c->trans_mod->cancel(c, req))
802 p9_client_flush(c, req);
803
804 /* if we received the response anyway, don't signal error */
805 if (req->status == REQ_STATUS_RCVD)
806 err = 0;
807 }
808 recalc_sigpending:
809 if (sigpending) {
810 spin_lock_irqsave(&current->sighand->siglock, flags);
811 recalc_sigpending();
812 spin_unlock_irqrestore(&current->sighand->siglock, flags);
813 }
814 if (err < 0)
815 goto reterr;
816
817 err = p9_check_errors(c, req);
818 trace_9p_client_res(c, type, req->rc->tag, err);
819 if (!err)
820 return req;
821 reterr:
822 p9_free_req(c, req);
823 return ERR_PTR(safe_errno(err));
824 }
825
826 /**
827 * p9_client_zc_rpc - issue a request and wait for a response
828 * @c: client session
829 * @type: type of request
830 * @uidata: destination for zero copy read
831 * @uodata: source for zero copy write
832 * @inlen: read buffer size
833 * @olen: write buffer size
834 * @hdrlen: reader header size, This is the size of response protocol data
835 * @fmt: protocol format string (see protocol.c)
836 *
837 * Returns request structure (which client must free using p9_free_req)
838 */
839 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
840 struct iov_iter *uidata,
841 struct iov_iter *uodata,
842 int inlen, int olen, int in_hdrlen,
843 const char *fmt, ...)
844 {
845 va_list ap;
846 int sigpending, err;
847 unsigned long flags;
848 struct p9_req_t *req;
849
850 va_start(ap, fmt);
851 /*
852 * We allocate a inline protocol data of only 4k bytes.
853 * The actual content is passed in zero-copy fashion.
854 */
855 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
856 va_end(ap);
857 if (IS_ERR(req))
858 return req;
859
860 if (signal_pending(current)) {
861 sigpending = 1;
862 clear_thread_flag(TIF_SIGPENDING);
863 } else
864 sigpending = 0;
865
866 err = c->trans_mod->zc_request(c, req, uidata, uodata,
867 inlen, olen, in_hdrlen);
868 if (err < 0) {
869 if (err == -EIO)
870 c->status = Disconnected;
871 if (err != -ERESTARTSYS)
872 goto recalc_sigpending;
873 }
874 if (req->status == REQ_STATUS_ERROR) {
875 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
876 err = req->t_err;
877 }
878 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
879 p9_debug(P9_DEBUG_MUX, "flushing\n");
880 sigpending = 1;
881 clear_thread_flag(TIF_SIGPENDING);
882
883 if (c->trans_mod->cancel(c, req))
884 p9_client_flush(c, req);
885
886 /* if we received the response anyway, don't signal error */
887 if (req->status == REQ_STATUS_RCVD)
888 err = 0;
889 }
890 recalc_sigpending:
891 if (sigpending) {
892 spin_lock_irqsave(&current->sighand->siglock, flags);
893 recalc_sigpending();
894 spin_unlock_irqrestore(&current->sighand->siglock, flags);
895 }
896 if (err < 0)
897 goto reterr;
898
899 err = p9_check_zc_errors(c, req, uidata, in_hdrlen);
900 trace_9p_client_res(c, type, req->rc->tag, err);
901 if (!err)
902 return req;
903 reterr:
904 p9_free_req(c, req);
905 return ERR_PTR(safe_errno(err));
906 }
907
908 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
909 {
910 int ret;
911 struct p9_fid *fid;
912 unsigned long flags;
913
914 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
915 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
916 if (!fid)
917 return ERR_PTR(-ENOMEM);
918
919 ret = p9_idpool_get(clnt->fidpool);
920 if (ret < 0) {
921 ret = -ENOSPC;
922 goto error;
923 }
924 fid->fid = ret;
925
926 memset(&fid->qid, 0, sizeof(struct p9_qid));
927 fid->mode = -1;
928 fid->uid = current_fsuid();
929 fid->clnt = clnt;
930 fid->rdir = NULL;
931 spin_lock_irqsave(&clnt->lock, flags);
932 list_add(&fid->flist, &clnt->fidlist);
933 spin_unlock_irqrestore(&clnt->lock, flags);
934
935 return fid;
936
937 error:
938 kfree(fid);
939 return ERR_PTR(ret);
940 }
941
942 static void p9_fid_destroy(struct p9_fid *fid)
943 {
944 struct p9_client *clnt;
945 unsigned long flags;
946
947 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
948 clnt = fid->clnt;
949 p9_idpool_put(fid->fid, clnt->fidpool);
950 spin_lock_irqsave(&clnt->lock, flags);
951 list_del(&fid->flist);
952 spin_unlock_irqrestore(&clnt->lock, flags);
953 kfree(fid->rdir);
954 kfree(fid);
955 }
956
957 static int p9_client_version(struct p9_client *c)
958 {
959 int err = 0;
960 struct p9_req_t *req;
961 char *version;
962 int msize;
963
964 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
965 c->msize, c->proto_version);
966
967 switch (c->proto_version) {
968 case p9_proto_2000L:
969 req = p9_client_rpc(c, P9_TVERSION, "ds",
970 c->msize, "9P2000.L");
971 break;
972 case p9_proto_2000u:
973 req = p9_client_rpc(c, P9_TVERSION, "ds",
974 c->msize, "9P2000.u");
975 break;
976 case p9_proto_legacy:
977 req = p9_client_rpc(c, P9_TVERSION, "ds",
978 c->msize, "9P2000");
979 break;
980 default:
981 return -EINVAL;
982 }
983
984 if (IS_ERR(req))
985 return PTR_ERR(req);
986
987 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
988 if (err) {
989 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
990 trace_9p_protocol_dump(c, req->rc);
991 goto error;
992 }
993
994 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
995 if (!strncmp(version, "9P2000.L", 8))
996 c->proto_version = p9_proto_2000L;
997 else if (!strncmp(version, "9P2000.u", 8))
998 c->proto_version = p9_proto_2000u;
999 else if (!strncmp(version, "9P2000", 6))
1000 c->proto_version = p9_proto_legacy;
1001 else {
1002 err = -EREMOTEIO;
1003 goto error;
1004 }
1005
1006 if (msize < c->msize)
1007 c->msize = msize;
1008
1009 error:
1010 kfree(version);
1011 p9_free_req(c, req);
1012
1013 return err;
1014 }
1015
1016 struct p9_client *p9_client_create(const char *dev_name, char *options)
1017 {
1018 int err;
1019 struct p9_client *clnt;
1020 char *client_id;
1021
1022 err = 0;
1023 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
1024 if (!clnt)
1025 return ERR_PTR(-ENOMEM);
1026
1027 clnt->trans_mod = NULL;
1028 clnt->trans = NULL;
1029
1030 client_id = utsname()->nodename;
1031 memcpy(clnt->name, client_id, strlen(client_id) + 1);
1032
1033 spin_lock_init(&clnt->lock);
1034 INIT_LIST_HEAD(&clnt->fidlist);
1035
1036 err = p9_tag_init(clnt);
1037 if (err < 0)
1038 goto free_client;
1039
1040 err = parse_opts(options, clnt);
1041 if (err < 0)
1042 goto destroy_tagpool;
1043
1044 if (!clnt->trans_mod)
1045 clnt->trans_mod = v9fs_get_default_trans();
1046
1047 if (clnt->trans_mod == NULL) {
1048 err = -EPROTONOSUPPORT;
1049 p9_debug(P9_DEBUG_ERROR,
1050 "No transport defined or default transport\n");
1051 goto destroy_tagpool;
1052 }
1053
1054 clnt->fidpool = p9_idpool_create();
1055 if (IS_ERR(clnt->fidpool)) {
1056 err = PTR_ERR(clnt->fidpool);
1057 goto put_trans;
1058 }
1059
1060 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1061 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1062
1063 err = clnt->trans_mod->create(clnt, dev_name, options);
1064 if (err)
1065 goto destroy_fidpool;
1066
1067 if (clnt->msize > clnt->trans_mod->maxsize)
1068 clnt->msize = clnt->trans_mod->maxsize;
1069
1070 err = p9_client_version(clnt);
1071 if (err)
1072 goto close_trans;
1073
1074 return clnt;
1075
1076 close_trans:
1077 clnt->trans_mod->close(clnt);
1078 destroy_fidpool:
1079 p9_idpool_destroy(clnt->fidpool);
1080 put_trans:
1081 v9fs_put_trans(clnt->trans_mod);
1082 destroy_tagpool:
1083 p9_idpool_destroy(clnt->tagpool);
1084 free_client:
1085 kfree(clnt);
1086 return ERR_PTR(err);
1087 }
1088 EXPORT_SYMBOL(p9_client_create);
1089
1090 void p9_client_destroy(struct p9_client *clnt)
1091 {
1092 struct p9_fid *fid, *fidptr;
1093
1094 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1095
1096 if (clnt->trans_mod)
1097 clnt->trans_mod->close(clnt);
1098
1099 v9fs_put_trans(clnt->trans_mod);
1100
1101 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
1102 pr_info("Found fid %d not clunked\n", fid->fid);
1103 p9_fid_destroy(fid);
1104 }
1105
1106 if (clnt->fidpool)
1107 p9_idpool_destroy(clnt->fidpool);
1108
1109 p9_tag_cleanup(clnt);
1110
1111 kfree(clnt);
1112 }
1113 EXPORT_SYMBOL(p9_client_destroy);
1114
1115 void p9_client_disconnect(struct p9_client *clnt)
1116 {
1117 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1118 clnt->status = Disconnected;
1119 }
1120 EXPORT_SYMBOL(p9_client_disconnect);
1121
1122 void p9_client_begin_disconnect(struct p9_client *clnt)
1123 {
1124 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1125 clnt->status = BeginDisconnect;
1126 }
1127 EXPORT_SYMBOL(p9_client_begin_disconnect);
1128
1129 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1130 const char *uname, kuid_t n_uname, const char *aname)
1131 {
1132 int err = 0;
1133 struct p9_req_t *req;
1134 struct p9_fid *fid;
1135 struct p9_qid qid;
1136
1137
1138 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1139 afid ? afid->fid : -1, uname, aname);
1140 fid = p9_fid_create(clnt);
1141 if (IS_ERR(fid)) {
1142 err = PTR_ERR(fid);
1143 fid = NULL;
1144 goto error;
1145 }
1146 fid->uid = n_uname;
1147
1148 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1149 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1150 if (IS_ERR(req)) {
1151 err = PTR_ERR(req);
1152 goto error;
1153 }
1154
1155 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
1156 if (err) {
1157 trace_9p_protocol_dump(clnt, req->rc);
1158 p9_free_req(clnt, req);
1159 goto error;
1160 }
1161
1162 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1163 qid.type, (unsigned long long)qid.path, qid.version);
1164
1165 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1166
1167 p9_free_req(clnt, req);
1168 return fid;
1169
1170 error:
1171 if (fid)
1172 p9_fid_destroy(fid);
1173 return ERR_PTR(err);
1174 }
1175 EXPORT_SYMBOL(p9_client_attach);
1176
1177 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1178 const unsigned char * const *wnames, int clone)
1179 {
1180 int err;
1181 struct p9_client *clnt;
1182 struct p9_fid *fid;
1183 struct p9_qid *wqids;
1184 struct p9_req_t *req;
1185 uint16_t nwqids, count;
1186
1187 err = 0;
1188 wqids = NULL;
1189 clnt = oldfid->clnt;
1190 if (clone) {
1191 fid = p9_fid_create(clnt);
1192 if (IS_ERR(fid)) {
1193 err = PTR_ERR(fid);
1194 fid = NULL;
1195 goto error;
1196 }
1197
1198 fid->uid = oldfid->uid;
1199 } else
1200 fid = oldfid;
1201
1202
1203 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1204 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1205
1206 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1207 nwname, wnames);
1208 if (IS_ERR(req)) {
1209 err = PTR_ERR(req);
1210 goto error;
1211 }
1212
1213 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1214 if (err) {
1215 trace_9p_protocol_dump(clnt, req->rc);
1216 p9_free_req(clnt, req);
1217 goto clunk_fid;
1218 }
1219 p9_free_req(clnt, req);
1220
1221 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1222
1223 if (nwqids != nwname) {
1224 err = -ENOENT;
1225 goto clunk_fid;
1226 }
1227
1228 for (count = 0; count < nwqids; count++)
1229 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1230 count, wqids[count].type,
1231 (unsigned long long)wqids[count].path,
1232 wqids[count].version);
1233
1234 if (nwname)
1235 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1236 else
1237 fid->qid = oldfid->qid;
1238
1239 kfree(wqids);
1240 return fid;
1241
1242 clunk_fid:
1243 kfree(wqids);
1244 p9_client_clunk(fid);
1245 fid = NULL;
1246
1247 error:
1248 if (fid && (fid != oldfid))
1249 p9_fid_destroy(fid);
1250
1251 return ERR_PTR(err);
1252 }
1253 EXPORT_SYMBOL(p9_client_walk);
1254
1255 int p9_client_open(struct p9_fid *fid, int mode)
1256 {
1257 int err;
1258 struct p9_client *clnt;
1259 struct p9_req_t *req;
1260 struct p9_qid qid;
1261 int iounit;
1262
1263 clnt = fid->clnt;
1264 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1265 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1266 err = 0;
1267
1268 if (fid->mode != -1)
1269 return -EINVAL;
1270
1271 if (p9_is_proto_dotl(clnt))
1272 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1273 else
1274 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1275 if (IS_ERR(req)) {
1276 err = PTR_ERR(req);
1277 goto error;
1278 }
1279
1280 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1281 if (err) {
1282 trace_9p_protocol_dump(clnt, req->rc);
1283 goto free_and_error;
1284 }
1285
1286 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1287 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1288 (unsigned long long)qid.path, qid.version, iounit);
1289
1290 fid->mode = mode;
1291 fid->iounit = iounit;
1292
1293 free_and_error:
1294 p9_free_req(clnt, req);
1295 error:
1296 return err;
1297 }
1298 EXPORT_SYMBOL(p9_client_open);
1299
1300 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode,
1301 kgid_t gid, struct p9_qid *qid)
1302 {
1303 int err = 0;
1304 struct p9_client *clnt;
1305 struct p9_req_t *req;
1306 int iounit;
1307
1308 p9_debug(P9_DEBUG_9P,
1309 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1310 ofid->fid, name, flags, mode,
1311 from_kgid(&init_user_ns, gid));
1312 clnt = ofid->clnt;
1313
1314 if (ofid->mode != -1)
1315 return -EINVAL;
1316
1317 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1318 mode, gid);
1319 if (IS_ERR(req)) {
1320 err = PTR_ERR(req);
1321 goto error;
1322 }
1323
1324 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1325 if (err) {
1326 trace_9p_protocol_dump(clnt, req->rc);
1327 goto free_and_error;
1328 }
1329
1330 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1331 qid->type,
1332 (unsigned long long)qid->path,
1333 qid->version, iounit);
1334
1335 ofid->mode = mode;
1336 ofid->iounit = iounit;
1337
1338 free_and_error:
1339 p9_free_req(clnt, req);
1340 error:
1341 return err;
1342 }
1343 EXPORT_SYMBOL(p9_client_create_dotl);
1344
1345 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode,
1346 char *extension)
1347 {
1348 int err;
1349 struct p9_client *clnt;
1350 struct p9_req_t *req;
1351 struct p9_qid qid;
1352 int iounit;
1353
1354 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1355 fid->fid, name, perm, mode);
1356 err = 0;
1357 clnt = fid->clnt;
1358
1359 if (fid->mode != -1)
1360 return -EINVAL;
1361
1362 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1363 mode, extension);
1364 if (IS_ERR(req)) {
1365 err = PTR_ERR(req);
1366 goto error;
1367 }
1368
1369 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1370 if (err) {
1371 trace_9p_protocol_dump(clnt, req->rc);
1372 goto free_and_error;
1373 }
1374
1375 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1376 qid.type,
1377 (unsigned long long)qid.path,
1378 qid.version, iounit);
1379
1380 fid->mode = mode;
1381 fid->iounit = iounit;
1382
1383 free_and_error:
1384 p9_free_req(clnt, req);
1385 error:
1386 return err;
1387 }
1388 EXPORT_SYMBOL(p9_client_fcreate);
1389
1390 int p9_client_symlink(struct p9_fid *dfid, const char *name,
1391 const char *symtgt, kgid_t gid, struct p9_qid *qid)
1392 {
1393 int err = 0;
1394 struct p9_client *clnt;
1395 struct p9_req_t *req;
1396
1397 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1398 dfid->fid, name, symtgt);
1399 clnt = dfid->clnt;
1400
1401 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1402 gid);
1403 if (IS_ERR(req)) {
1404 err = PTR_ERR(req);
1405 goto error;
1406 }
1407
1408 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1409 if (err) {
1410 trace_9p_protocol_dump(clnt, req->rc);
1411 goto free_and_error;
1412 }
1413
1414 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1415 qid->type, (unsigned long long)qid->path, qid->version);
1416
1417 free_and_error:
1418 p9_free_req(clnt, req);
1419 error:
1420 return err;
1421 }
1422 EXPORT_SYMBOL(p9_client_symlink);
1423
1424 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname)
1425 {
1426 struct p9_client *clnt;
1427 struct p9_req_t *req;
1428
1429 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1430 dfid->fid, oldfid->fid, newname);
1431 clnt = dfid->clnt;
1432 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1433 newname);
1434 if (IS_ERR(req))
1435 return PTR_ERR(req);
1436
1437 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1438 p9_free_req(clnt, req);
1439 return 0;
1440 }
1441 EXPORT_SYMBOL(p9_client_link);
1442
1443 int p9_client_fsync(struct p9_fid *fid, int datasync)
1444 {
1445 int err;
1446 struct p9_client *clnt;
1447 struct p9_req_t *req;
1448
1449 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1450 fid->fid, datasync);
1451 err = 0;
1452 clnt = fid->clnt;
1453
1454 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1455 if (IS_ERR(req)) {
1456 err = PTR_ERR(req);
1457 goto error;
1458 }
1459
1460 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1461
1462 p9_free_req(clnt, req);
1463
1464 error:
1465 return err;
1466 }
1467 EXPORT_SYMBOL(p9_client_fsync);
1468
1469 int p9_client_clunk(struct p9_fid *fid)
1470 {
1471 int err;
1472 struct p9_client *clnt;
1473 struct p9_req_t *req;
1474 int retries = 0;
1475
1476 if (!fid) {
1477 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1478 __func__, task_pid_nr(current));
1479 dump_stack();
1480 return 0;
1481 }
1482
1483 again:
1484 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1485 retries);
1486 err = 0;
1487 clnt = fid->clnt;
1488
1489 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1490 if (IS_ERR(req)) {
1491 err = PTR_ERR(req);
1492 goto error;
1493 }
1494
1495 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1496
1497 p9_free_req(clnt, req);
1498 error:
1499 /*
1500 * Fid is not valid even after a failed clunk
1501 * If interrupted, retry once then give up and
1502 * leak fid until umount.
1503 */
1504 if (err == -ERESTARTSYS) {
1505 if (retries++ == 0)
1506 goto again;
1507 } else
1508 p9_fid_destroy(fid);
1509 return err;
1510 }
1511 EXPORT_SYMBOL(p9_client_clunk);
1512
1513 int p9_client_remove(struct p9_fid *fid)
1514 {
1515 int err;
1516 struct p9_client *clnt;
1517 struct p9_req_t *req;
1518
1519 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1520 err = 0;
1521 clnt = fid->clnt;
1522
1523 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1524 if (IS_ERR(req)) {
1525 err = PTR_ERR(req);
1526 goto error;
1527 }
1528
1529 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1530
1531 p9_free_req(clnt, req);
1532 error:
1533 if (err == -ERESTARTSYS)
1534 p9_client_clunk(fid);
1535 else
1536 p9_fid_destroy(fid);
1537 return err;
1538 }
1539 EXPORT_SYMBOL(p9_client_remove);
1540
1541 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1542 {
1543 int err = 0;
1544 struct p9_req_t *req;
1545 struct p9_client *clnt;
1546
1547 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1548 dfid->fid, name, flags);
1549
1550 clnt = dfid->clnt;
1551 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1552 if (IS_ERR(req)) {
1553 err = PTR_ERR(req);
1554 goto error;
1555 }
1556 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1557
1558 p9_free_req(clnt, req);
1559 error:
1560 return err;
1561 }
1562 EXPORT_SYMBOL(p9_client_unlinkat);
1563
1564 int
1565 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
1566 {
1567 struct p9_client *clnt = fid->clnt;
1568 struct p9_req_t *req;
1569 int total = 0;
1570 *err = 0;
1571
1572 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1573 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to));
1574
1575 while (iov_iter_count(to)) {
1576 int count = iov_iter_count(to);
1577 int rsize, non_zc = 0;
1578 char *dataptr;
1579
1580 rsize = fid->iounit;
1581 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1582 rsize = clnt->msize - P9_IOHDRSZ;
1583
1584 if (count < rsize)
1585 rsize = count;
1586
1587 /* Don't bother zerocopy for small IO (< 1024) */
1588 if (clnt->trans_mod->zc_request && rsize > 1024) {
1589 /*
1590 * response header len is 11
1591 * PDU Header(7) + IO Size (4)
1592 */
1593 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize,
1594 0, 11, "dqd", fid->fid,
1595 offset, rsize);
1596 } else {
1597 non_zc = 1;
1598 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1599 rsize);
1600 }
1601 if (IS_ERR(req)) {
1602 *err = PTR_ERR(req);
1603 break;
1604 }
1605
1606 *err = p9pdu_readf(req->rc, clnt->proto_version,
1607 "D", &count, &dataptr);
1608 if (*err) {
1609 trace_9p_protocol_dump(clnt, req->rc);
1610 p9_free_req(clnt, req);
1611 break;
1612 }
1613 if (rsize < count) {
1614 pr_err("bogus RREAD count (%d > %d)\n", count, rsize);
1615 count = rsize;
1616 }
1617
1618 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1619 if (!count) {
1620 p9_free_req(clnt, req);
1621 break;
1622 }
1623
1624 if (non_zc) {
1625 int n = copy_to_iter(dataptr, count, to);
1626 total += n;
1627 offset += n;
1628 if (n != count) {
1629 *err = -EFAULT;
1630 p9_free_req(clnt, req);
1631 break;
1632 }
1633 } else {
1634 iov_iter_advance(to, count);
1635 total += count;
1636 offset += count;
1637 }
1638 p9_free_req(clnt, req);
1639 }
1640 return total;
1641 }
1642 EXPORT_SYMBOL(p9_client_read);
1643
1644 int
1645 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
1646 {
1647 struct p9_client *clnt = fid->clnt;
1648 struct p9_req_t *req;
1649 int total = 0;
1650 *err = 0;
1651
1652 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n",
1653 fid->fid, (unsigned long long) offset,
1654 iov_iter_count(from));
1655
1656 while (iov_iter_count(from)) {
1657 int count = iov_iter_count(from);
1658 int rsize = fid->iounit;
1659 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1660 rsize = clnt->msize - P9_IOHDRSZ;
1661
1662 if (count < rsize)
1663 rsize = count;
1664
1665 /* Don't bother zerocopy for small IO (< 1024) */
1666 if (clnt->trans_mod->zc_request && rsize > 1024) {
1667 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0,
1668 rsize, P9_ZC_HDR_SZ, "dqd",
1669 fid->fid, offset, rsize);
1670 } else {
1671 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
1672 offset, rsize, from);
1673 }
1674 if (IS_ERR(req)) {
1675 *err = PTR_ERR(req);
1676 break;
1677 }
1678
1679 *err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1680 if (*err) {
1681 trace_9p_protocol_dump(clnt, req->rc);
1682 p9_free_req(clnt, req);
1683 break;
1684 }
1685 if (rsize < count) {
1686 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize);
1687 count = rsize;
1688 }
1689
1690 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1691
1692 p9_free_req(clnt, req);
1693 iov_iter_advance(from, count);
1694 total += count;
1695 offset += count;
1696 }
1697 return total;
1698 }
1699 EXPORT_SYMBOL(p9_client_write);
1700
1701 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1702 {
1703 int err;
1704 struct p9_client *clnt;
1705 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1706 struct p9_req_t *req;
1707 u16 ignored;
1708
1709 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1710
1711 if (!ret)
1712 return ERR_PTR(-ENOMEM);
1713
1714 err = 0;
1715 clnt = fid->clnt;
1716
1717 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1718 if (IS_ERR(req)) {
1719 err = PTR_ERR(req);
1720 goto error;
1721 }
1722
1723 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1724 if (err) {
1725 trace_9p_protocol_dump(clnt, req->rc);
1726 p9_free_req(clnt, req);
1727 goto error;
1728 }
1729
1730 p9_debug(P9_DEBUG_9P,
1731 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1732 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1733 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1734 "<<< uid=%d gid=%d n_muid=%d\n",
1735 ret->size, ret->type, ret->dev, ret->qid.type,
1736 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1737 ret->atime, ret->mtime, (unsigned long long)ret->length,
1738 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1739 from_kuid(&init_user_ns, ret->n_uid),
1740 from_kgid(&init_user_ns, ret->n_gid),
1741 from_kuid(&init_user_ns, ret->n_muid));
1742
1743 p9_free_req(clnt, req);
1744 return ret;
1745
1746 error:
1747 kfree(ret);
1748 return ERR_PTR(err);
1749 }
1750 EXPORT_SYMBOL(p9_client_stat);
1751
1752 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1753 u64 request_mask)
1754 {
1755 int err;
1756 struct p9_client *clnt;
1757 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1758 GFP_KERNEL);
1759 struct p9_req_t *req;
1760
1761 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1762 fid->fid, request_mask);
1763
1764 if (!ret)
1765 return ERR_PTR(-ENOMEM);
1766
1767 err = 0;
1768 clnt = fid->clnt;
1769
1770 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1771 if (IS_ERR(req)) {
1772 err = PTR_ERR(req);
1773 goto error;
1774 }
1775
1776 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1777 if (err) {
1778 trace_9p_protocol_dump(clnt, req->rc);
1779 p9_free_req(clnt, req);
1780 goto error;
1781 }
1782
1783 p9_debug(P9_DEBUG_9P,
1784 "<<< RGETATTR st_result_mask=%lld\n"
1785 "<<< qid=%x.%llx.%x\n"
1786 "<<< st_mode=%8.8x st_nlink=%llu\n"
1787 "<<< st_uid=%d st_gid=%d\n"
1788 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1789 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1790 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1791 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1792 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1793 "<<< st_gen=%lld st_data_version=%lld",
1794 ret->st_result_mask, ret->qid.type, ret->qid.path,
1795 ret->qid.version, ret->st_mode, ret->st_nlink,
1796 from_kuid(&init_user_ns, ret->st_uid),
1797 from_kgid(&init_user_ns, ret->st_gid),
1798 ret->st_rdev, ret->st_size, ret->st_blksize,
1799 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1800 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1801 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1802 ret->st_gen, ret->st_data_version);
1803
1804 p9_free_req(clnt, req);
1805 return ret;
1806
1807 error:
1808 kfree(ret);
1809 return ERR_PTR(err);
1810 }
1811 EXPORT_SYMBOL(p9_client_getattr_dotl);
1812
1813 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1814 {
1815 int ret;
1816
1817 /* NOTE: size shouldn't include its own length */
1818 /* size[2] type[2] dev[4] qid[13] */
1819 /* mode[4] atime[4] mtime[4] length[8]*/
1820 /* name[s] uid[s] gid[s] muid[s] */
1821 ret = 2+4+13+4+4+4+8+2+2+2+2;
1822
1823 if (wst->name)
1824 ret += strlen(wst->name);
1825 if (wst->uid)
1826 ret += strlen(wst->uid);
1827 if (wst->gid)
1828 ret += strlen(wst->gid);
1829 if (wst->muid)
1830 ret += strlen(wst->muid);
1831
1832 if ((proto_version == p9_proto_2000u) ||
1833 (proto_version == p9_proto_2000L)) {
1834 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1835 if (wst->extension)
1836 ret += strlen(wst->extension);
1837 }
1838
1839 return ret;
1840 }
1841
1842 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1843 {
1844 int err;
1845 struct p9_req_t *req;
1846 struct p9_client *clnt;
1847
1848 err = 0;
1849 clnt = fid->clnt;
1850 wst->size = p9_client_statsize(wst, clnt->proto_version);
1851 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1852 p9_debug(P9_DEBUG_9P,
1853 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1854 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1855 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1856 " uid=%d gid=%d n_muid=%d\n",
1857 wst->size, wst->type, wst->dev, wst->qid.type,
1858 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1859 wst->atime, wst->mtime, (unsigned long long)wst->length,
1860 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1861 from_kuid(&init_user_ns, wst->n_uid),
1862 from_kgid(&init_user_ns, wst->n_gid),
1863 from_kuid(&init_user_ns, wst->n_muid));
1864
1865 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1866 if (IS_ERR(req)) {
1867 err = PTR_ERR(req);
1868 goto error;
1869 }
1870
1871 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1872
1873 p9_free_req(clnt, req);
1874 error:
1875 return err;
1876 }
1877 EXPORT_SYMBOL(p9_client_wstat);
1878
1879 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1880 {
1881 int err;
1882 struct p9_req_t *req;
1883 struct p9_client *clnt;
1884
1885 err = 0;
1886 clnt = fid->clnt;
1887 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1888 p9_debug(P9_DEBUG_9P,
1889 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1890 " atime_sec=%lld atime_nsec=%lld\n"
1891 " mtime_sec=%lld mtime_nsec=%lld\n",
1892 p9attr->valid, p9attr->mode,
1893 from_kuid(&init_user_ns, p9attr->uid),
1894 from_kgid(&init_user_ns, p9attr->gid),
1895 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1896 p9attr->mtime_sec, p9attr->mtime_nsec);
1897
1898 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1899
1900 if (IS_ERR(req)) {
1901 err = PTR_ERR(req);
1902 goto error;
1903 }
1904 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1905 p9_free_req(clnt, req);
1906 error:
1907 return err;
1908 }
1909 EXPORT_SYMBOL(p9_client_setattr);
1910
1911 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1912 {
1913 int err;
1914 struct p9_req_t *req;
1915 struct p9_client *clnt;
1916
1917 err = 0;
1918 clnt = fid->clnt;
1919
1920 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1921
1922 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1923 if (IS_ERR(req)) {
1924 err = PTR_ERR(req);
1925 goto error;
1926 }
1927
1928 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1929 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1930 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1931 if (err) {
1932 trace_9p_protocol_dump(clnt, req->rc);
1933 p9_free_req(clnt, req);
1934 goto error;
1935 }
1936
1937 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1938 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1939 "fsid %llu namelen %ld\n",
1940 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1941 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1942 sb->fsid, (long int)sb->namelen);
1943
1944 p9_free_req(clnt, req);
1945 error:
1946 return err;
1947 }
1948 EXPORT_SYMBOL(p9_client_statfs);
1949
1950 int p9_client_rename(struct p9_fid *fid,
1951 struct p9_fid *newdirfid, const char *name)
1952 {
1953 int err;
1954 struct p9_req_t *req;
1955 struct p9_client *clnt;
1956
1957 err = 0;
1958 clnt = fid->clnt;
1959
1960 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1961 fid->fid, newdirfid->fid, name);
1962
1963 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1964 newdirfid->fid, name);
1965 if (IS_ERR(req)) {
1966 err = PTR_ERR(req);
1967 goto error;
1968 }
1969
1970 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1971
1972 p9_free_req(clnt, req);
1973 error:
1974 return err;
1975 }
1976 EXPORT_SYMBOL(p9_client_rename);
1977
1978 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1979 struct p9_fid *newdirfid, const char *new_name)
1980 {
1981 int err;
1982 struct p9_req_t *req;
1983 struct p9_client *clnt;
1984
1985 err = 0;
1986 clnt = olddirfid->clnt;
1987
1988 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1989 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1990 newdirfid->fid, new_name);
1991
1992 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1993 old_name, newdirfid->fid, new_name);
1994 if (IS_ERR(req)) {
1995 err = PTR_ERR(req);
1996 goto error;
1997 }
1998
1999 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
2000 newdirfid->fid, new_name);
2001
2002 p9_free_req(clnt, req);
2003 error:
2004 return err;
2005 }
2006 EXPORT_SYMBOL(p9_client_renameat);
2007
2008 /*
2009 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
2010 */
2011 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
2012 const char *attr_name, u64 *attr_size)
2013 {
2014 int err;
2015 struct p9_req_t *req;
2016 struct p9_client *clnt;
2017 struct p9_fid *attr_fid;
2018
2019 err = 0;
2020 clnt = file_fid->clnt;
2021 attr_fid = p9_fid_create(clnt);
2022 if (IS_ERR(attr_fid)) {
2023 err = PTR_ERR(attr_fid);
2024 attr_fid = NULL;
2025 goto error;
2026 }
2027 p9_debug(P9_DEBUG_9P,
2028 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
2029 file_fid->fid, attr_fid->fid, attr_name);
2030
2031 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
2032 file_fid->fid, attr_fid->fid, attr_name);
2033 if (IS_ERR(req)) {
2034 err = PTR_ERR(req);
2035 goto error;
2036 }
2037 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
2038 if (err) {
2039 trace_9p_protocol_dump(clnt, req->rc);
2040 p9_free_req(clnt, req);
2041 goto clunk_fid;
2042 }
2043 p9_free_req(clnt, req);
2044 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2045 attr_fid->fid, *attr_size);
2046 return attr_fid;
2047 clunk_fid:
2048 p9_client_clunk(attr_fid);
2049 attr_fid = NULL;
2050 error:
2051 if (attr_fid && (attr_fid != file_fid))
2052 p9_fid_destroy(attr_fid);
2053
2054 return ERR_PTR(err);
2055 }
2056 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2057
2058 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2059 u64 attr_size, int flags)
2060 {
2061 int err;
2062 struct p9_req_t *req;
2063 struct p9_client *clnt;
2064
2065 p9_debug(P9_DEBUG_9P,
2066 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2067 fid->fid, name, (long long)attr_size, flags);
2068 err = 0;
2069 clnt = fid->clnt;
2070 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2071 fid->fid, name, attr_size, flags);
2072 if (IS_ERR(req)) {
2073 err = PTR_ERR(req);
2074 goto error;
2075 }
2076 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2077 p9_free_req(clnt, req);
2078 error:
2079 return err;
2080 }
2081 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2082
2083 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2084 {
2085 int err, rsize, non_zc = 0;
2086 struct p9_client *clnt;
2087 struct p9_req_t *req;
2088 char *dataptr;
2089 struct kvec kv = {.iov_base = data, .iov_len = count};
2090 struct iov_iter to;
2091
2092 iov_iter_kvec(&to, READ | ITER_KVEC, &kv, 1, count);
2093
2094 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2095 fid->fid, (unsigned long long) offset, count);
2096
2097 err = 0;
2098 clnt = fid->clnt;
2099
2100 rsize = fid->iounit;
2101 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2102 rsize = clnt->msize - P9_READDIRHDRSZ;
2103
2104 if (count < rsize)
2105 rsize = count;
2106
2107 /* Don't bother zerocopy for small IO (< 1024) */
2108 if (clnt->trans_mod->zc_request && rsize > 1024) {
2109 /*
2110 * response header len is 11
2111 * PDU Header(7) + IO Size (4)
2112 */
2113 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0,
2114 11, "dqd", fid->fid, offset, rsize);
2115 } else {
2116 non_zc = 1;
2117 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2118 offset, rsize);
2119 }
2120 if (IS_ERR(req)) {
2121 err = PTR_ERR(req);
2122 goto error;
2123 }
2124
2125 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2126 if (err) {
2127 trace_9p_protocol_dump(clnt, req->rc);
2128 goto free_and_error;
2129 }
2130 if (rsize < count) {
2131 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize);
2132 count = rsize;
2133 }
2134
2135 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2136
2137 if (non_zc)
2138 memmove(data, dataptr, count);
2139
2140 p9_free_req(clnt, req);
2141 return count;
2142
2143 free_and_error:
2144 p9_free_req(clnt, req);
2145 error:
2146 return err;
2147 }
2148 EXPORT_SYMBOL(p9_client_readdir);
2149
2150 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode,
2151 dev_t rdev, kgid_t gid, struct p9_qid *qid)
2152 {
2153 int err;
2154 struct p9_client *clnt;
2155 struct p9_req_t *req;
2156
2157 err = 0;
2158 clnt = fid->clnt;
2159 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2160 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2161 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2162 MAJOR(rdev), MINOR(rdev), gid);
2163 if (IS_ERR(req))
2164 return PTR_ERR(req);
2165
2166 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2167 if (err) {
2168 trace_9p_protocol_dump(clnt, req->rc);
2169 goto error;
2170 }
2171 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2172 (unsigned long long)qid->path, qid->version);
2173
2174 error:
2175 p9_free_req(clnt, req);
2176 return err;
2177
2178 }
2179 EXPORT_SYMBOL(p9_client_mknod_dotl);
2180
2181 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode,
2182 kgid_t gid, struct p9_qid *qid)
2183 {
2184 int err;
2185 struct p9_client *clnt;
2186 struct p9_req_t *req;
2187
2188 err = 0;
2189 clnt = fid->clnt;
2190 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2191 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2192 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
2193 gid);
2194 if (IS_ERR(req))
2195 return PTR_ERR(req);
2196
2197 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2198 if (err) {
2199 trace_9p_protocol_dump(clnt, req->rc);
2200 goto error;
2201 }
2202 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2203 (unsigned long long)qid->path, qid->version);
2204
2205 error:
2206 p9_free_req(clnt, req);
2207 return err;
2208
2209 }
2210 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2211
2212 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2213 {
2214 int err;
2215 struct p9_client *clnt;
2216 struct p9_req_t *req;
2217
2218 err = 0;
2219 clnt = fid->clnt;
2220 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2221 "start %lld length %lld proc_id %d client_id %s\n",
2222 fid->fid, flock->type, flock->flags, flock->start,
2223 flock->length, flock->proc_id, flock->client_id);
2224
2225 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2226 flock->flags, flock->start, flock->length,
2227 flock->proc_id, flock->client_id);
2228
2229 if (IS_ERR(req))
2230 return PTR_ERR(req);
2231
2232 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2233 if (err) {
2234 trace_9p_protocol_dump(clnt, req->rc);
2235 goto error;
2236 }
2237 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2238 error:
2239 p9_free_req(clnt, req);
2240 return err;
2241
2242 }
2243 EXPORT_SYMBOL(p9_client_lock_dotl);
2244
2245 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2246 {
2247 int err;
2248 struct p9_client *clnt;
2249 struct p9_req_t *req;
2250
2251 err = 0;
2252 clnt = fid->clnt;
2253 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2254 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2255 glock->start, glock->length, glock->proc_id, glock->client_id);
2256
2257 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2258 glock->start, glock->length, glock->proc_id, glock->client_id);
2259
2260 if (IS_ERR(req))
2261 return PTR_ERR(req);
2262
2263 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2264 &glock->start, &glock->length, &glock->proc_id,
2265 &glock->client_id);
2266 if (err) {
2267 trace_9p_protocol_dump(clnt, req->rc);
2268 goto error;
2269 }
2270 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2271 "proc_id %d client_id %s\n", glock->type, glock->start,
2272 glock->length, glock->proc_id, glock->client_id);
2273 error:
2274 p9_free_req(clnt, req);
2275 return err;
2276 }
2277 EXPORT_SYMBOL(p9_client_getlock_dotl);
2278
2279 int p9_client_readlink(struct p9_fid *fid, char **target)
2280 {
2281 int err;
2282 struct p9_client *clnt;
2283 struct p9_req_t *req;
2284
2285 err = 0;
2286 clnt = fid->clnt;
2287 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2288
2289 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2290 if (IS_ERR(req))
2291 return PTR_ERR(req);
2292
2293 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2294 if (err) {
2295 trace_9p_protocol_dump(clnt, req->rc);
2296 goto error;
2297 }
2298 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2299 error:
2300 p9_free_req(clnt, req);
2301 return err;
2302 }
2303 EXPORT_SYMBOL(p9_client_readlink);
Ubuntu Focal Linux kernel mirror