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[mirror_ubuntu-jammy-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 kfree(s);
202 goto free_and_return;
203 }
204 kfree(s);
205 break;
206 case Opt_legacy:
207 clnt->proto_version = p9_proto_legacy;
208 break;
209 case Opt_version:
210 s = match_strdup(&args[0]);
211 if (!s) {
212 ret = -ENOMEM;
213 p9_debug(P9_DEBUG_ERROR,
214 "problem allocating copy of version arg\n");
215 goto free_and_return;
216 }
217 ret = get_protocol_version(s);
218 if (ret == -EINVAL) {
219 kfree(s);
220 goto free_and_return;
221 }
222 kfree(s);
223 clnt->proto_version = ret;
224 break;
225 default:
226 continue;
227 }
228 }
229
230 free_and_return:
231 v9fs_put_trans(clnt->trans_mod);
232 kfree(tmp_options);
233 return ret;
234 }
235
236 static struct p9_fcall *p9_fcall_alloc(int alloc_msize)
237 {
238 struct p9_fcall *fc;
239 fc = kmalloc(sizeof(struct p9_fcall) + alloc_msize, GFP_NOFS);
240 if (!fc)
241 return NULL;
242 fc->capacity = alloc_msize;
243 fc->sdata = (char *) fc + sizeof(struct p9_fcall);
244 return fc;
245 }
246
247 /**
248 * p9_tag_alloc - lookup/allocate a request by tag
249 * @c: client session to lookup tag within
250 * @tag: numeric id for transaction
251 *
252 * this is a simple array lookup, but will grow the
253 * request_slots as necessary to accommodate transaction
254 * ids which did not previously have a slot.
255 *
256 * this code relies on the client spinlock to manage locks, its
257 * possible we should switch to something else, but I'd rather
258 * stick with something low-overhead for the common case.
259 *
260 */
261
262 static struct p9_req_t *
263 p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
264 {
265 unsigned long flags;
266 int row, col;
267 struct p9_req_t *req;
268 int alloc_msize = min(c->msize, max_size);
269
270 /* This looks up the original request by tag so we know which
271 * buffer to read the data into */
272 tag++;
273
274 if (tag >= c->max_tag) {
275 spin_lock_irqsave(&c->lock, flags);
276 /* check again since original check was outside of lock */
277 while (tag >= c->max_tag) {
278 row = (tag / P9_ROW_MAXTAG);
279 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
280 sizeof(struct p9_req_t), GFP_ATOMIC);
281
282 if (!c->reqs[row]) {
283 pr_err("Couldn't grow tag array\n");
284 spin_unlock_irqrestore(&c->lock, flags);
285 return ERR_PTR(-ENOMEM);
286 }
287 for (col = 0; col < P9_ROW_MAXTAG; col++) {
288 c->reqs[row][col].status = REQ_STATUS_IDLE;
289 c->reqs[row][col].tc = NULL;
290 }
291 c->max_tag += P9_ROW_MAXTAG;
292 }
293 spin_unlock_irqrestore(&c->lock, flags);
294 }
295 row = tag / P9_ROW_MAXTAG;
296 col = tag % P9_ROW_MAXTAG;
297
298 req = &c->reqs[row][col];
299 if (!req->wq) {
300 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
301 if (!req->wq)
302 goto grow_failed;
303 init_waitqueue_head(req->wq);
304 }
305
306 if (!req->tc)
307 req->tc = p9_fcall_alloc(alloc_msize);
308 if (!req->rc)
309 req->rc = p9_fcall_alloc(alloc_msize);
310 if (!req->tc || !req->rc)
311 goto grow_failed;
312
313 p9pdu_reset(req->tc);
314 p9pdu_reset(req->rc);
315
316 req->tc->tag = tag-1;
317 req->status = REQ_STATUS_ALLOC;
318
319 return req;
320
321 grow_failed:
322 pr_err("Couldn't grow tag array\n");
323 kfree(req->tc);
324 kfree(req->rc);
325 kfree(req->wq);
326 req->tc = req->rc = NULL;
327 req->wq = NULL;
328 return ERR_PTR(-ENOMEM);
329 }
330
331 /**
332 * p9_tag_lookup - lookup a request by tag
333 * @c: client session to lookup tag within
334 * @tag: numeric id for transaction
335 *
336 */
337
338 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
339 {
340 int row, col;
341
342 /* This looks up the original request by tag so we know which
343 * buffer to read the data into */
344 tag++;
345
346 if(tag >= c->max_tag)
347 return NULL;
348
349 row = tag / P9_ROW_MAXTAG;
350 col = tag % P9_ROW_MAXTAG;
351
352 return &c->reqs[row][col];
353 }
354 EXPORT_SYMBOL(p9_tag_lookup);
355
356 /**
357 * p9_tag_init - setup tags structure and contents
358 * @c: v9fs client struct
359 *
360 * This initializes the tags structure for each client instance.
361 *
362 */
363
364 static int p9_tag_init(struct p9_client *c)
365 {
366 int err = 0;
367
368 c->tagpool = p9_idpool_create();
369 if (IS_ERR(c->tagpool)) {
370 err = PTR_ERR(c->tagpool);
371 goto error;
372 }
373 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
374 if (err < 0) {
375 p9_idpool_destroy(c->tagpool);
376 goto error;
377 }
378 c->max_tag = 0;
379 error:
380 return err;
381 }
382
383 /**
384 * p9_tag_cleanup - cleans up tags structure and reclaims resources
385 * @c: v9fs client struct
386 *
387 * This frees resources associated with the tags structure
388 *
389 */
390 static void p9_tag_cleanup(struct p9_client *c)
391 {
392 int row, col;
393
394 /* check to insure all requests are idle */
395 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
396 for (col = 0; col < P9_ROW_MAXTAG; col++) {
397 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
398 p9_debug(P9_DEBUG_MUX,
399 "Attempting to cleanup non-free tag %d,%d\n",
400 row, col);
401 /* TODO: delay execution of cleanup */
402 return;
403 }
404 }
405 }
406
407 if (c->tagpool) {
408 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
409 p9_idpool_destroy(c->tagpool);
410 }
411
412 /* free requests associated with tags */
413 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
414 for (col = 0; col < P9_ROW_MAXTAG; col++) {
415 kfree(c->reqs[row][col].wq);
416 kfree(c->reqs[row][col].tc);
417 kfree(c->reqs[row][col].rc);
418 }
419 kfree(c->reqs[row]);
420 }
421 c->max_tag = 0;
422 }
423
424 /**
425 * p9_free_req - free a request and clean-up as necessary
426 * c: client state
427 * r: request to release
428 *
429 */
430
431 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
432 {
433 int tag = r->tc->tag;
434 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
435
436 r->status = REQ_STATUS_IDLE;
437 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
438 p9_idpool_put(tag, c->tagpool);
439 }
440
441 /**
442 * p9_client_cb - call back from transport to client
443 * c: client state
444 * req: request received
445 *
446 */
447 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status)
448 {
449 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
450
451 /*
452 * This barrier is needed to make sure any change made to req before
453 * the other thread wakes up will indeed be seen by the waiting side.
454 */
455 smp_wmb();
456 req->status = status;
457
458 wake_up(req->wq);
459 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
460 }
461 EXPORT_SYMBOL(p9_client_cb);
462
463 /**
464 * p9_parse_header - parse header arguments out of a packet
465 * @pdu: packet to parse
466 * @size: size of packet
467 * @type: type of request
468 * @tag: tag of packet
469 * @rewind: set if we need to rewind offset afterwards
470 */
471
472 int
473 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
474 int rewind)
475 {
476 int8_t r_type;
477 int16_t r_tag;
478 int32_t r_size;
479 int offset = pdu->offset;
480 int err;
481
482 pdu->offset = 0;
483 if (pdu->size == 0)
484 pdu->size = 7;
485
486 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
487 if (err)
488 goto rewind_and_exit;
489
490 pdu->size = r_size;
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
497 if (type)
498 *type = r_type;
499 if (tag)
500 *tag = r_tag;
501 if (size)
502 *size = r_size;
503
504
505 rewind_and_exit:
506 if (rewind)
507 pdu->offset = offset;
508 return err;
509 }
510 EXPORT_SYMBOL(p9_parse_header);
511
512 /**
513 * p9_check_errors - check 9p packet for error return and process it
514 * @c: current client instance
515 * @req: request to parse and check for error conditions
516 *
517 * returns error code if one is discovered, otherwise returns 0
518 *
519 * this will have to be more complicated if we have multiple
520 * error packet types
521 */
522
523 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
524 {
525 int8_t type;
526 int err;
527 int ecode;
528
529 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
530 /*
531 * dump the response from server
532 * This should be after check errors which poplulate pdu_fcall.
533 */
534 trace_9p_protocol_dump(c, req->rc);
535 if (err) {
536 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
537 return err;
538 }
539 if (type != P9_RERROR && type != P9_RLERROR)
540 return 0;
541
542 if (!p9_is_proto_dotl(c)) {
543 char *ename;
544 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
545 &ename, &ecode);
546 if (err)
547 goto out_err;
548
549 if (p9_is_proto_dotu(c) && ecode < 512)
550 err = -ecode;
551
552 if (!err) {
553 err = p9_errstr2errno(ename, strlen(ename));
554
555 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
556 -ecode, ename);
557 }
558 kfree(ename);
559 } else {
560 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
561 err = -ecode;
562
563 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
564 }
565
566 return err;
567
568 out_err:
569 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
570
571 return err;
572 }
573
574 /**
575 * p9_check_zc_errors - check 9p packet for error return and process it
576 * @c: current client instance
577 * @req: request to parse and check for error conditions
578 * @in_hdrlen: Size of response protocol buffer.
579 *
580 * returns error code if one is discovered, otherwise returns 0
581 *
582 * this will have to be more complicated if we have multiple
583 * error packet types
584 */
585
586 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
587 struct iov_iter *uidata, int in_hdrlen)
588 {
589 int err;
590 int ecode;
591 int8_t type;
592 char *ename = NULL;
593
594 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
595 /*
596 * dump the response from server
597 * This should be after parse_header which poplulate pdu_fcall.
598 */
599 trace_9p_protocol_dump(c, req->rc);
600 if (err) {
601 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
602 return err;
603 }
604
605 if (type != P9_RERROR && type != P9_RLERROR)
606 return 0;
607
608 if (!p9_is_proto_dotl(c)) {
609 /* Error is reported in string format */
610 int len;
611 /* 7 = header size for RERROR; */
612 int inline_len = in_hdrlen - 7;
613
614 len = req->rc->size - req->rc->offset;
615 if (len > (P9_ZC_HDR_SZ - 7)) {
616 err = -EFAULT;
617 goto out_err;
618 }
619
620 ename = &req->rc->sdata[req->rc->offset];
621 if (len > inline_len) {
622 /* We have error in external buffer */
623 if (!copy_from_iter_full(ename + inline_len,
624 len - inline_len, uidata)) {
625 err = -EFAULT;
626 goto out_err;
627 }
628 }
629 ename = NULL;
630 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
631 &ename, &ecode);
632 if (err)
633 goto out_err;
634
635 if (p9_is_proto_dotu(c) && ecode < 512)
636 err = -ecode;
637
638 if (!err) {
639 err = p9_errstr2errno(ename, strlen(ename));
640
641 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
642 -ecode, ename);
643 }
644 kfree(ename);
645 } else {
646 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
647 err = -ecode;
648
649 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
650 }
651 return err;
652
653 out_err:
654 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
655 return err;
656 }
657
658 static struct p9_req_t *
659 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
660
661 /**
662 * p9_client_flush - flush (cancel) a request
663 * @c: client state
664 * @oldreq: request to cancel
665 *
666 * This sents a flush for a particular request and links
667 * the flush request to the original request. The current
668 * code only supports a single flush request although the protocol
669 * allows for multiple flush requests to be sent for a single request.
670 *
671 */
672
673 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
674 {
675 struct p9_req_t *req;
676 int16_t oldtag;
677 int err;
678
679 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
680 if (err)
681 return err;
682
683 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
684
685 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
686 if (IS_ERR(req))
687 return PTR_ERR(req);
688
689 /*
690 * if we haven't received a response for oldreq,
691 * remove it from the list
692 */
693 if (oldreq->status == REQ_STATUS_SENT)
694 if (c->trans_mod->cancelled)
695 c->trans_mod->cancelled(c, oldreq);
696
697 p9_free_req(c, req);
698 return 0;
699 }
700
701 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
702 int8_t type, int req_size,
703 const char *fmt, va_list ap)
704 {
705 int tag, err;
706 struct p9_req_t *req;
707
708 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
709
710 /* we allow for any status other than disconnected */
711 if (c->status == Disconnected)
712 return ERR_PTR(-EIO);
713
714 /* if status is begin_disconnected we allow only clunk request */
715 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
716 return ERR_PTR(-EIO);
717
718 tag = P9_NOTAG;
719 if (type != P9_TVERSION) {
720 tag = p9_idpool_get(c->tagpool);
721 if (tag < 0)
722 return ERR_PTR(-ENOMEM);
723 }
724
725 req = p9_tag_alloc(c, tag, req_size);
726 if (IS_ERR(req))
727 return req;
728
729 /* marshall the data */
730 p9pdu_prepare(req->tc, tag, type);
731 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
732 if (err)
733 goto reterr;
734 p9pdu_finalize(c, req->tc);
735 trace_9p_client_req(c, type, tag);
736 return req;
737 reterr:
738 p9_free_req(c, req);
739 return ERR_PTR(err);
740 }
741
742 /**
743 * p9_client_rpc - issue a request and wait for a response
744 * @c: client session
745 * @type: type of request
746 * @fmt: protocol format string (see protocol.c)
747 *
748 * Returns request structure (which client must free using p9_free_req)
749 */
750
751 static struct p9_req_t *
752 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
753 {
754 va_list ap;
755 int sigpending, err;
756 unsigned long flags;
757 struct p9_req_t *req;
758
759 va_start(ap, fmt);
760 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
761 va_end(ap);
762 if (IS_ERR(req))
763 return req;
764
765 if (signal_pending(current)) {
766 sigpending = 1;
767 clear_thread_flag(TIF_SIGPENDING);
768 } else
769 sigpending = 0;
770
771 err = c->trans_mod->request(c, req);
772 if (err < 0) {
773 if (err != -ERESTARTSYS && err != -EFAULT)
774 c->status = Disconnected;
775 goto recalc_sigpending;
776 }
777 again:
778 /* Wait for the response */
779 err = wait_event_killable(*req->wq, req->status >= REQ_STATUS_RCVD);
780
781 /*
782 * Make sure our req is coherent with regard to updates in other
783 * threads - echoes to wmb() in the callback
784 */
785 smp_rmb();
786
787 if ((err == -ERESTARTSYS) && (c->status == Connected)
788 && (type == P9_TFLUSH)) {
789 sigpending = 1;
790 clear_thread_flag(TIF_SIGPENDING);
791 goto again;
792 }
793
794 if (req->status == REQ_STATUS_ERROR) {
795 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
796 err = req->t_err;
797 }
798 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
799 p9_debug(P9_DEBUG_MUX, "flushing\n");
800 sigpending = 1;
801 clear_thread_flag(TIF_SIGPENDING);
802
803 if (c->trans_mod->cancel(c, req))
804 p9_client_flush(c, req);
805
806 /* if we received the response anyway, don't signal error */
807 if (req->status == REQ_STATUS_RCVD)
808 err = 0;
809 }
810 recalc_sigpending:
811 if (sigpending) {
812 spin_lock_irqsave(&current->sighand->siglock, flags);
813 recalc_sigpending();
814 spin_unlock_irqrestore(&current->sighand->siglock, flags);
815 }
816 if (err < 0)
817 goto reterr;
818
819 err = p9_check_errors(c, req);
820 trace_9p_client_res(c, type, req->rc->tag, err);
821 if (!err)
822 return req;
823 reterr:
824 p9_free_req(c, req);
825 return ERR_PTR(safe_errno(err));
826 }
827
828 /**
829 * p9_client_zc_rpc - issue a request and wait for a response
830 * @c: client session
831 * @type: type of request
832 * @uidata: destination for zero copy read
833 * @uodata: source for zero copy write
834 * @inlen: read buffer size
835 * @olen: write buffer size
836 * @hdrlen: reader header size, This is the size of response protocol data
837 * @fmt: protocol format string (see protocol.c)
838 *
839 * Returns request structure (which client must free using p9_free_req)
840 */
841 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
842 struct iov_iter *uidata,
843 struct iov_iter *uodata,
844 int inlen, int olen, int in_hdrlen,
845 const char *fmt, ...)
846 {
847 va_list ap;
848 int sigpending, err;
849 unsigned long flags;
850 struct p9_req_t *req;
851
852 va_start(ap, fmt);
853 /*
854 * We allocate a inline protocol data of only 4k bytes.
855 * The actual content is passed in zero-copy fashion.
856 */
857 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
858 va_end(ap);
859 if (IS_ERR(req))
860 return req;
861
862 if (signal_pending(current)) {
863 sigpending = 1;
864 clear_thread_flag(TIF_SIGPENDING);
865 } else
866 sigpending = 0;
867
868 err = c->trans_mod->zc_request(c, req, uidata, uodata,
869 inlen, olen, in_hdrlen);
870 if (err < 0) {
871 if (err == -EIO)
872 c->status = Disconnected;
873 if (err != -ERESTARTSYS)
874 goto recalc_sigpending;
875 }
876 if (req->status == REQ_STATUS_ERROR) {
877 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
878 err = req->t_err;
879 }
880 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
881 p9_debug(P9_DEBUG_MUX, "flushing\n");
882 sigpending = 1;
883 clear_thread_flag(TIF_SIGPENDING);
884
885 if (c->trans_mod->cancel(c, req))
886 p9_client_flush(c, req);
887
888 /* if we received the response anyway, don't signal error */
889 if (req->status == REQ_STATUS_RCVD)
890 err = 0;
891 }
892 recalc_sigpending:
893 if (sigpending) {
894 spin_lock_irqsave(&current->sighand->siglock, flags);
895 recalc_sigpending();
896 spin_unlock_irqrestore(&current->sighand->siglock, flags);
897 }
898 if (err < 0)
899 goto reterr;
900
901 err = p9_check_zc_errors(c, req, uidata, in_hdrlen);
902 trace_9p_client_res(c, type, req->rc->tag, err);
903 if (!err)
904 return req;
905 reterr:
906 p9_free_req(c, req);
907 return ERR_PTR(safe_errno(err));
908 }
909
910 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
911 {
912 int ret;
913 struct p9_fid *fid;
914 unsigned long flags;
915
916 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
917 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
918 if (!fid)
919 return ERR_PTR(-ENOMEM);
920
921 ret = p9_idpool_get(clnt->fidpool);
922 if (ret < 0) {
923 ret = -ENOSPC;
924 goto error;
925 }
926 fid->fid = ret;
927
928 memset(&fid->qid, 0, sizeof(struct p9_qid));
929 fid->mode = -1;
930 fid->uid = current_fsuid();
931 fid->clnt = clnt;
932 fid->rdir = NULL;
933 spin_lock_irqsave(&clnt->lock, flags);
934 list_add(&fid->flist, &clnt->fidlist);
935 spin_unlock_irqrestore(&clnt->lock, flags);
936
937 return fid;
938
939 error:
940 kfree(fid);
941 return ERR_PTR(ret);
942 }
943
944 static void p9_fid_destroy(struct p9_fid *fid)
945 {
946 struct p9_client *clnt;
947 unsigned long flags;
948
949 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
950 clnt = fid->clnt;
951 p9_idpool_put(fid->fid, clnt->fidpool);
952 spin_lock_irqsave(&clnt->lock, flags);
953 list_del(&fid->flist);
954 spin_unlock_irqrestore(&clnt->lock, flags);
955 kfree(fid->rdir);
956 kfree(fid);
957 }
958
959 static int p9_client_version(struct p9_client *c)
960 {
961 int err = 0;
962 struct p9_req_t *req;
963 char *version;
964 int msize;
965
966 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
967 c->msize, c->proto_version);
968
969 switch (c->proto_version) {
970 case p9_proto_2000L:
971 req = p9_client_rpc(c, P9_TVERSION, "ds",
972 c->msize, "9P2000.L");
973 break;
974 case p9_proto_2000u:
975 req = p9_client_rpc(c, P9_TVERSION, "ds",
976 c->msize, "9P2000.u");
977 break;
978 case p9_proto_legacy:
979 req = p9_client_rpc(c, P9_TVERSION, "ds",
980 c->msize, "9P2000");
981 break;
982 default:
983 return -EINVAL;
984 }
985
986 if (IS_ERR(req))
987 return PTR_ERR(req);
988
989 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
990 if (err) {
991 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
992 trace_9p_protocol_dump(c, req->rc);
993 goto error;
994 }
995
996 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
997 if (!strncmp(version, "9P2000.L", 8))
998 c->proto_version = p9_proto_2000L;
999 else if (!strncmp(version, "9P2000.u", 8))
1000 c->proto_version = p9_proto_2000u;
1001 else if (!strncmp(version, "9P2000", 6))
1002 c->proto_version = p9_proto_legacy;
1003 else {
1004 err = -EREMOTEIO;
1005 goto error;
1006 }
1007
1008 if (msize < c->msize)
1009 c->msize = msize;
1010
1011 error:
1012 kfree(version);
1013 p9_free_req(c, req);
1014
1015 return err;
1016 }
1017
1018 struct p9_client *p9_client_create(const char *dev_name, char *options)
1019 {
1020 int err;
1021 struct p9_client *clnt;
1022 char *client_id;
1023
1024 err = 0;
1025 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
1026 if (!clnt)
1027 return ERR_PTR(-ENOMEM);
1028
1029 clnt->trans_mod = NULL;
1030 clnt->trans = NULL;
1031
1032 client_id = utsname()->nodename;
1033 memcpy(clnt->name, client_id, strlen(client_id) + 1);
1034
1035 spin_lock_init(&clnt->lock);
1036 INIT_LIST_HEAD(&clnt->fidlist);
1037
1038 err = p9_tag_init(clnt);
1039 if (err < 0)
1040 goto free_client;
1041
1042 err = parse_opts(options, clnt);
1043 if (err < 0)
1044 goto destroy_tagpool;
1045
1046 if (!clnt->trans_mod)
1047 clnt->trans_mod = v9fs_get_default_trans();
1048
1049 if (clnt->trans_mod == NULL) {
1050 err = -EPROTONOSUPPORT;
1051 p9_debug(P9_DEBUG_ERROR,
1052 "No transport defined or default transport\n");
1053 goto destroy_tagpool;
1054 }
1055
1056 clnt->fidpool = p9_idpool_create();
1057 if (IS_ERR(clnt->fidpool)) {
1058 err = PTR_ERR(clnt->fidpool);
1059 goto put_trans;
1060 }
1061
1062 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1063 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1064
1065 err = clnt->trans_mod->create(clnt, dev_name, options);
1066 if (err)
1067 goto destroy_fidpool;
1068
1069 if (clnt->msize > clnt->trans_mod->maxsize)
1070 clnt->msize = clnt->trans_mod->maxsize;
1071
1072 err = p9_client_version(clnt);
1073 if (err)
1074 goto close_trans;
1075
1076 return clnt;
1077
1078 close_trans:
1079 clnt->trans_mod->close(clnt);
1080 destroy_fidpool:
1081 p9_idpool_destroy(clnt->fidpool);
1082 put_trans:
1083 v9fs_put_trans(clnt->trans_mod);
1084 destroy_tagpool:
1085 p9_idpool_destroy(clnt->tagpool);
1086 free_client:
1087 kfree(clnt);
1088 return ERR_PTR(err);
1089 }
1090 EXPORT_SYMBOL(p9_client_create);
1091
1092 void p9_client_destroy(struct p9_client *clnt)
1093 {
1094 struct p9_fid *fid, *fidptr;
1095
1096 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1097
1098 if (clnt->trans_mod)
1099 clnt->trans_mod->close(clnt);
1100
1101 v9fs_put_trans(clnt->trans_mod);
1102
1103 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
1104 pr_info("Found fid %d not clunked\n", fid->fid);
1105 p9_fid_destroy(fid);
1106 }
1107
1108 if (clnt->fidpool)
1109 p9_idpool_destroy(clnt->fidpool);
1110
1111 p9_tag_cleanup(clnt);
1112
1113 kfree(clnt);
1114 }
1115 EXPORT_SYMBOL(p9_client_destroy);
1116
1117 void p9_client_disconnect(struct p9_client *clnt)
1118 {
1119 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1120 clnt->status = Disconnected;
1121 }
1122 EXPORT_SYMBOL(p9_client_disconnect);
1123
1124 void p9_client_begin_disconnect(struct p9_client *clnt)
1125 {
1126 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1127 clnt->status = BeginDisconnect;
1128 }
1129 EXPORT_SYMBOL(p9_client_begin_disconnect);
1130
1131 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1132 const char *uname, kuid_t n_uname, const char *aname)
1133 {
1134 int err = 0;
1135 struct p9_req_t *req;
1136 struct p9_fid *fid;
1137 struct p9_qid qid;
1138
1139
1140 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1141 afid ? afid->fid : -1, uname, aname);
1142 fid = p9_fid_create(clnt);
1143 if (IS_ERR(fid)) {
1144 err = PTR_ERR(fid);
1145 fid = NULL;
1146 goto error;
1147 }
1148 fid->uid = n_uname;
1149
1150 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1151 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1152 if (IS_ERR(req)) {
1153 err = PTR_ERR(req);
1154 goto error;
1155 }
1156
1157 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
1158 if (err) {
1159 trace_9p_protocol_dump(clnt, req->rc);
1160 p9_free_req(clnt, req);
1161 goto error;
1162 }
1163
1164 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1165 qid.type, (unsigned long long)qid.path, qid.version);
1166
1167 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1168
1169 p9_free_req(clnt, req);
1170 return fid;
1171
1172 error:
1173 if (fid)
1174 p9_fid_destroy(fid);
1175 return ERR_PTR(err);
1176 }
1177 EXPORT_SYMBOL(p9_client_attach);
1178
1179 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1180 const unsigned char * const *wnames, int clone)
1181 {
1182 int err;
1183 struct p9_client *clnt;
1184 struct p9_fid *fid;
1185 struct p9_qid *wqids;
1186 struct p9_req_t *req;
1187 uint16_t nwqids, count;
1188
1189 err = 0;
1190 wqids = NULL;
1191 clnt = oldfid->clnt;
1192 if (clone) {
1193 fid = p9_fid_create(clnt);
1194 if (IS_ERR(fid)) {
1195 err = PTR_ERR(fid);
1196 fid = NULL;
1197 goto error;
1198 }
1199
1200 fid->uid = oldfid->uid;
1201 } else
1202 fid = oldfid;
1203
1204
1205 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1206 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1207
1208 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1209 nwname, wnames);
1210 if (IS_ERR(req)) {
1211 err = PTR_ERR(req);
1212 goto error;
1213 }
1214
1215 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1216 if (err) {
1217 trace_9p_protocol_dump(clnt, req->rc);
1218 p9_free_req(clnt, req);
1219 goto clunk_fid;
1220 }
1221 p9_free_req(clnt, req);
1222
1223 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1224
1225 if (nwqids != nwname) {
1226 err = -ENOENT;
1227 goto clunk_fid;
1228 }
1229
1230 for (count = 0; count < nwqids; count++)
1231 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1232 count, wqids[count].type,
1233 (unsigned long long)wqids[count].path,
1234 wqids[count].version);
1235
1236 if (nwname)
1237 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1238 else
1239 fid->qid = oldfid->qid;
1240
1241 kfree(wqids);
1242 return fid;
1243
1244 clunk_fid:
1245 kfree(wqids);
1246 p9_client_clunk(fid);
1247 fid = NULL;
1248
1249 error:
1250 if (fid && (fid != oldfid))
1251 p9_fid_destroy(fid);
1252
1253 return ERR_PTR(err);
1254 }
1255 EXPORT_SYMBOL(p9_client_walk);
1256
1257 int p9_client_open(struct p9_fid *fid, int mode)
1258 {
1259 int err;
1260 struct p9_client *clnt;
1261 struct p9_req_t *req;
1262 struct p9_qid qid;
1263 int iounit;
1264
1265 clnt = fid->clnt;
1266 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1267 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1268 err = 0;
1269
1270 if (fid->mode != -1)
1271 return -EINVAL;
1272
1273 if (p9_is_proto_dotl(clnt))
1274 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1275 else
1276 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
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, "<<< %s qid %x.%llx.%x iounit %x\n",
1289 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1290 (unsigned long long)qid.path, qid.version, iounit);
1291
1292 fid->mode = mode;
1293 fid->iounit = iounit;
1294
1295 free_and_error:
1296 p9_free_req(clnt, req);
1297 error:
1298 return err;
1299 }
1300 EXPORT_SYMBOL(p9_client_open);
1301
1302 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode,
1303 kgid_t gid, struct p9_qid *qid)
1304 {
1305 int err = 0;
1306 struct p9_client *clnt;
1307 struct p9_req_t *req;
1308 int iounit;
1309
1310 p9_debug(P9_DEBUG_9P,
1311 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1312 ofid->fid, name, flags, mode,
1313 from_kgid(&init_user_ns, gid));
1314 clnt = ofid->clnt;
1315
1316 if (ofid->mode != -1)
1317 return -EINVAL;
1318
1319 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1320 mode, gid);
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, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1333 qid->type,
1334 (unsigned long long)qid->path,
1335 qid->version, iounit);
1336
1337 ofid->mode = mode;
1338 ofid->iounit = iounit;
1339
1340 free_and_error:
1341 p9_free_req(clnt, req);
1342 error:
1343 return err;
1344 }
1345 EXPORT_SYMBOL(p9_client_create_dotl);
1346
1347 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode,
1348 char *extension)
1349 {
1350 int err;
1351 struct p9_client *clnt;
1352 struct p9_req_t *req;
1353 struct p9_qid qid;
1354 int iounit;
1355
1356 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1357 fid->fid, name, perm, mode);
1358 err = 0;
1359 clnt = fid->clnt;
1360
1361 if (fid->mode != -1)
1362 return -EINVAL;
1363
1364 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1365 mode, extension);
1366 if (IS_ERR(req)) {
1367 err = PTR_ERR(req);
1368 goto error;
1369 }
1370
1371 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1372 if (err) {
1373 trace_9p_protocol_dump(clnt, req->rc);
1374 goto free_and_error;
1375 }
1376
1377 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1378 qid.type,
1379 (unsigned long long)qid.path,
1380 qid.version, iounit);
1381
1382 fid->mode = mode;
1383 fid->iounit = iounit;
1384
1385 free_and_error:
1386 p9_free_req(clnt, req);
1387 error:
1388 return err;
1389 }
1390 EXPORT_SYMBOL(p9_client_fcreate);
1391
1392 int p9_client_symlink(struct p9_fid *dfid, const char *name,
1393 const char *symtgt, kgid_t gid, struct p9_qid *qid)
1394 {
1395 int err = 0;
1396 struct p9_client *clnt;
1397 struct p9_req_t *req;
1398
1399 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1400 dfid->fid, name, symtgt);
1401 clnt = dfid->clnt;
1402
1403 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1404 gid);
1405 if (IS_ERR(req)) {
1406 err = PTR_ERR(req);
1407 goto error;
1408 }
1409
1410 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1411 if (err) {
1412 trace_9p_protocol_dump(clnt, req->rc);
1413 goto free_and_error;
1414 }
1415
1416 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1417 qid->type, (unsigned long long)qid->path, qid->version);
1418
1419 free_and_error:
1420 p9_free_req(clnt, req);
1421 error:
1422 return err;
1423 }
1424 EXPORT_SYMBOL(p9_client_symlink);
1425
1426 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname)
1427 {
1428 struct p9_client *clnt;
1429 struct p9_req_t *req;
1430
1431 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1432 dfid->fid, oldfid->fid, newname);
1433 clnt = dfid->clnt;
1434 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1435 newname);
1436 if (IS_ERR(req))
1437 return PTR_ERR(req);
1438
1439 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1440 p9_free_req(clnt, req);
1441 return 0;
1442 }
1443 EXPORT_SYMBOL(p9_client_link);
1444
1445 int p9_client_fsync(struct p9_fid *fid, int datasync)
1446 {
1447 int err;
1448 struct p9_client *clnt;
1449 struct p9_req_t *req;
1450
1451 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1452 fid->fid, datasync);
1453 err = 0;
1454 clnt = fid->clnt;
1455
1456 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1457 if (IS_ERR(req)) {
1458 err = PTR_ERR(req);
1459 goto error;
1460 }
1461
1462 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1463
1464 p9_free_req(clnt, req);
1465
1466 error:
1467 return err;
1468 }
1469 EXPORT_SYMBOL(p9_client_fsync);
1470
1471 int p9_client_clunk(struct p9_fid *fid)
1472 {
1473 int err;
1474 struct p9_client *clnt;
1475 struct p9_req_t *req;
1476 int retries = 0;
1477
1478 if (!fid) {
1479 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1480 __func__, task_pid_nr(current));
1481 dump_stack();
1482 return 0;
1483 }
1484
1485 again:
1486 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1487 retries);
1488 err = 0;
1489 clnt = fid->clnt;
1490
1491 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1492 if (IS_ERR(req)) {
1493 err = PTR_ERR(req);
1494 goto error;
1495 }
1496
1497 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1498
1499 p9_free_req(clnt, req);
1500 error:
1501 /*
1502 * Fid is not valid even after a failed clunk
1503 * If interrupted, retry once then give up and
1504 * leak fid until umount.
1505 */
1506 if (err == -ERESTARTSYS) {
1507 if (retries++ == 0)
1508 goto again;
1509 } else
1510 p9_fid_destroy(fid);
1511 return err;
1512 }
1513 EXPORT_SYMBOL(p9_client_clunk);
1514
1515 int p9_client_remove(struct p9_fid *fid)
1516 {
1517 int err;
1518 struct p9_client *clnt;
1519 struct p9_req_t *req;
1520
1521 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1522 err = 0;
1523 clnt = fid->clnt;
1524
1525 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1526 if (IS_ERR(req)) {
1527 err = PTR_ERR(req);
1528 goto error;
1529 }
1530
1531 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1532
1533 p9_free_req(clnt, req);
1534 error:
1535 if (err == -ERESTARTSYS)
1536 p9_client_clunk(fid);
1537 else
1538 p9_fid_destroy(fid);
1539 return err;
1540 }
1541 EXPORT_SYMBOL(p9_client_remove);
1542
1543 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1544 {
1545 int err = 0;
1546 struct p9_req_t *req;
1547 struct p9_client *clnt;
1548
1549 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1550 dfid->fid, name, flags);
1551
1552 clnt = dfid->clnt;
1553 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1554 if (IS_ERR(req)) {
1555 err = PTR_ERR(req);
1556 goto error;
1557 }
1558 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1559
1560 p9_free_req(clnt, req);
1561 error:
1562 return err;
1563 }
1564 EXPORT_SYMBOL(p9_client_unlinkat);
1565
1566 int
1567 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
1568 {
1569 struct p9_client *clnt = fid->clnt;
1570 struct p9_req_t *req;
1571 int total = 0;
1572 *err = 0;
1573
1574 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1575 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to));
1576
1577 while (iov_iter_count(to)) {
1578 int count = iov_iter_count(to);
1579 int rsize, non_zc = 0;
1580 char *dataptr;
1581
1582 rsize = fid->iounit;
1583 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1584 rsize = clnt->msize - P9_IOHDRSZ;
1585
1586 if (count < rsize)
1587 rsize = count;
1588
1589 /* Don't bother zerocopy for small IO (< 1024) */
1590 if (clnt->trans_mod->zc_request && rsize > 1024) {
1591 /*
1592 * response header len is 11
1593 * PDU Header(7) + IO Size (4)
1594 */
1595 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize,
1596 0, 11, "dqd", fid->fid,
1597 offset, rsize);
1598 } else {
1599 non_zc = 1;
1600 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1601 rsize);
1602 }
1603 if (IS_ERR(req)) {
1604 *err = PTR_ERR(req);
1605 break;
1606 }
1607
1608 *err = p9pdu_readf(req->rc, clnt->proto_version,
1609 "D", &count, &dataptr);
1610 if (*err) {
1611 trace_9p_protocol_dump(clnt, req->rc);
1612 p9_free_req(clnt, req);
1613 break;
1614 }
1615 if (rsize < count) {
1616 pr_err("bogus RREAD count (%d > %d)\n", count, rsize);
1617 count = rsize;
1618 }
1619
1620 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1621 if (!count) {
1622 p9_free_req(clnt, req);
1623 break;
1624 }
1625
1626 if (non_zc) {
1627 int n = copy_to_iter(dataptr, count, to);
1628 total += n;
1629 offset += n;
1630 if (n != count) {
1631 *err = -EFAULT;
1632 p9_free_req(clnt, req);
1633 break;
1634 }
1635 } else {
1636 iov_iter_advance(to, count);
1637 total += count;
1638 offset += count;
1639 }
1640 p9_free_req(clnt, req);
1641 }
1642 return total;
1643 }
1644 EXPORT_SYMBOL(p9_client_read);
1645
1646 int
1647 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
1648 {
1649 struct p9_client *clnt = fid->clnt;
1650 struct p9_req_t *req;
1651 int total = 0;
1652 *err = 0;
1653
1654 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n",
1655 fid->fid, (unsigned long long) offset,
1656 iov_iter_count(from));
1657
1658 while (iov_iter_count(from)) {
1659 int count = iov_iter_count(from);
1660 int rsize = fid->iounit;
1661 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1662 rsize = clnt->msize - P9_IOHDRSZ;
1663
1664 if (count < rsize)
1665 rsize = count;
1666
1667 /* Don't bother zerocopy for small IO (< 1024) */
1668 if (clnt->trans_mod->zc_request && rsize > 1024) {
1669 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0,
1670 rsize, P9_ZC_HDR_SZ, "dqd",
1671 fid->fid, offset, rsize);
1672 } else {
1673 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
1674 offset, rsize, from);
1675 }
1676 if (IS_ERR(req)) {
1677 *err = PTR_ERR(req);
1678 break;
1679 }
1680
1681 *err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1682 if (*err) {
1683 trace_9p_protocol_dump(clnt, req->rc);
1684 p9_free_req(clnt, req);
1685 break;
1686 }
1687 if (rsize < count) {
1688 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize);
1689 count = rsize;
1690 }
1691
1692 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1693
1694 p9_free_req(clnt, req);
1695 iov_iter_advance(from, count);
1696 total += count;
1697 offset += count;
1698 }
1699 return total;
1700 }
1701 EXPORT_SYMBOL(p9_client_write);
1702
1703 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1704 {
1705 int err;
1706 struct p9_client *clnt;
1707 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1708 struct p9_req_t *req;
1709 u16 ignored;
1710
1711 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1712
1713 if (!ret)
1714 return ERR_PTR(-ENOMEM);
1715
1716 err = 0;
1717 clnt = fid->clnt;
1718
1719 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1720 if (IS_ERR(req)) {
1721 err = PTR_ERR(req);
1722 goto error;
1723 }
1724
1725 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1726 if (err) {
1727 trace_9p_protocol_dump(clnt, req->rc);
1728 p9_free_req(clnt, req);
1729 goto error;
1730 }
1731
1732 p9_debug(P9_DEBUG_9P,
1733 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1734 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1735 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1736 "<<< uid=%d gid=%d n_muid=%d\n",
1737 ret->size, ret->type, ret->dev, ret->qid.type,
1738 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1739 ret->atime, ret->mtime, (unsigned long long)ret->length,
1740 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1741 from_kuid(&init_user_ns, ret->n_uid),
1742 from_kgid(&init_user_ns, ret->n_gid),
1743 from_kuid(&init_user_ns, ret->n_muid));
1744
1745 p9_free_req(clnt, req);
1746 return ret;
1747
1748 error:
1749 kfree(ret);
1750 return ERR_PTR(err);
1751 }
1752 EXPORT_SYMBOL(p9_client_stat);
1753
1754 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1755 u64 request_mask)
1756 {
1757 int err;
1758 struct p9_client *clnt;
1759 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1760 GFP_KERNEL);
1761 struct p9_req_t *req;
1762
1763 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1764 fid->fid, request_mask);
1765
1766 if (!ret)
1767 return ERR_PTR(-ENOMEM);
1768
1769 err = 0;
1770 clnt = fid->clnt;
1771
1772 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1773 if (IS_ERR(req)) {
1774 err = PTR_ERR(req);
1775 goto error;
1776 }
1777
1778 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1779 if (err) {
1780 trace_9p_protocol_dump(clnt, req->rc);
1781 p9_free_req(clnt, req);
1782 goto error;
1783 }
1784
1785 p9_debug(P9_DEBUG_9P,
1786 "<<< RGETATTR st_result_mask=%lld\n"
1787 "<<< qid=%x.%llx.%x\n"
1788 "<<< st_mode=%8.8x st_nlink=%llu\n"
1789 "<<< st_uid=%d st_gid=%d\n"
1790 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1791 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1792 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1793 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1794 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1795 "<<< st_gen=%lld st_data_version=%lld",
1796 ret->st_result_mask, ret->qid.type, ret->qid.path,
1797 ret->qid.version, ret->st_mode, ret->st_nlink,
1798 from_kuid(&init_user_ns, ret->st_uid),
1799 from_kgid(&init_user_ns, ret->st_gid),
1800 ret->st_rdev, ret->st_size, ret->st_blksize,
1801 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1802 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1803 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1804 ret->st_gen, ret->st_data_version);
1805
1806 p9_free_req(clnt, req);
1807 return ret;
1808
1809 error:
1810 kfree(ret);
1811 return ERR_PTR(err);
1812 }
1813 EXPORT_SYMBOL(p9_client_getattr_dotl);
1814
1815 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1816 {
1817 int ret;
1818
1819 /* NOTE: size shouldn't include its own length */
1820 /* size[2] type[2] dev[4] qid[13] */
1821 /* mode[4] atime[4] mtime[4] length[8]*/
1822 /* name[s] uid[s] gid[s] muid[s] */
1823 ret = 2+4+13+4+4+4+8+2+2+2+2;
1824
1825 if (wst->name)
1826 ret += strlen(wst->name);
1827 if (wst->uid)
1828 ret += strlen(wst->uid);
1829 if (wst->gid)
1830 ret += strlen(wst->gid);
1831 if (wst->muid)
1832 ret += strlen(wst->muid);
1833
1834 if ((proto_version == p9_proto_2000u) ||
1835 (proto_version == p9_proto_2000L)) {
1836 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1837 if (wst->extension)
1838 ret += strlen(wst->extension);
1839 }
1840
1841 return ret;
1842 }
1843
1844 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1845 {
1846 int err;
1847 struct p9_req_t *req;
1848 struct p9_client *clnt;
1849
1850 err = 0;
1851 clnt = fid->clnt;
1852 wst->size = p9_client_statsize(wst, clnt->proto_version);
1853 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1854 p9_debug(P9_DEBUG_9P,
1855 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1856 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1857 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1858 " uid=%d gid=%d n_muid=%d\n",
1859 wst->size, wst->type, wst->dev, wst->qid.type,
1860 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1861 wst->atime, wst->mtime, (unsigned long long)wst->length,
1862 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1863 from_kuid(&init_user_ns, wst->n_uid),
1864 from_kgid(&init_user_ns, wst->n_gid),
1865 from_kuid(&init_user_ns, wst->n_muid));
1866
1867 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1868 if (IS_ERR(req)) {
1869 err = PTR_ERR(req);
1870 goto error;
1871 }
1872
1873 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1874
1875 p9_free_req(clnt, req);
1876 error:
1877 return err;
1878 }
1879 EXPORT_SYMBOL(p9_client_wstat);
1880
1881 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1882 {
1883 int err;
1884 struct p9_req_t *req;
1885 struct p9_client *clnt;
1886
1887 err = 0;
1888 clnt = fid->clnt;
1889 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1890 p9_debug(P9_DEBUG_9P,
1891 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1892 " atime_sec=%lld atime_nsec=%lld\n"
1893 " mtime_sec=%lld mtime_nsec=%lld\n",
1894 p9attr->valid, p9attr->mode,
1895 from_kuid(&init_user_ns, p9attr->uid),
1896 from_kgid(&init_user_ns, p9attr->gid),
1897 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1898 p9attr->mtime_sec, p9attr->mtime_nsec);
1899
1900 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1901
1902 if (IS_ERR(req)) {
1903 err = PTR_ERR(req);
1904 goto error;
1905 }
1906 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1907 p9_free_req(clnt, req);
1908 error:
1909 return err;
1910 }
1911 EXPORT_SYMBOL(p9_client_setattr);
1912
1913 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1914 {
1915 int err;
1916 struct p9_req_t *req;
1917 struct p9_client *clnt;
1918
1919 err = 0;
1920 clnt = fid->clnt;
1921
1922 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1923
1924 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1925 if (IS_ERR(req)) {
1926 err = PTR_ERR(req);
1927 goto error;
1928 }
1929
1930 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1931 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1932 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1933 if (err) {
1934 trace_9p_protocol_dump(clnt, req->rc);
1935 p9_free_req(clnt, req);
1936 goto error;
1937 }
1938
1939 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1940 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1941 "fsid %llu namelen %ld\n",
1942 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1943 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1944 sb->fsid, (long int)sb->namelen);
1945
1946 p9_free_req(clnt, req);
1947 error:
1948 return err;
1949 }
1950 EXPORT_SYMBOL(p9_client_statfs);
1951
1952 int p9_client_rename(struct p9_fid *fid,
1953 struct p9_fid *newdirfid, const char *name)
1954 {
1955 int err;
1956 struct p9_req_t *req;
1957 struct p9_client *clnt;
1958
1959 err = 0;
1960 clnt = fid->clnt;
1961
1962 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1963 fid->fid, newdirfid->fid, name);
1964
1965 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1966 newdirfid->fid, name);
1967 if (IS_ERR(req)) {
1968 err = PTR_ERR(req);
1969 goto error;
1970 }
1971
1972 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1973
1974 p9_free_req(clnt, req);
1975 error:
1976 return err;
1977 }
1978 EXPORT_SYMBOL(p9_client_rename);
1979
1980 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1981 struct p9_fid *newdirfid, const char *new_name)
1982 {
1983 int err;
1984 struct p9_req_t *req;
1985 struct p9_client *clnt;
1986
1987 err = 0;
1988 clnt = olddirfid->clnt;
1989
1990 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1991 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1992 newdirfid->fid, new_name);
1993
1994 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1995 old_name, newdirfid->fid, new_name);
1996 if (IS_ERR(req)) {
1997 err = PTR_ERR(req);
1998 goto error;
1999 }
2000
2001 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
2002 newdirfid->fid, new_name);
2003
2004 p9_free_req(clnt, req);
2005 error:
2006 return err;
2007 }
2008 EXPORT_SYMBOL(p9_client_renameat);
2009
2010 /*
2011 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
2012 */
2013 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
2014 const char *attr_name, u64 *attr_size)
2015 {
2016 int err;
2017 struct p9_req_t *req;
2018 struct p9_client *clnt;
2019 struct p9_fid *attr_fid;
2020
2021 err = 0;
2022 clnt = file_fid->clnt;
2023 attr_fid = p9_fid_create(clnt);
2024 if (IS_ERR(attr_fid)) {
2025 err = PTR_ERR(attr_fid);
2026 attr_fid = NULL;
2027 goto error;
2028 }
2029 p9_debug(P9_DEBUG_9P,
2030 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
2031 file_fid->fid, attr_fid->fid, attr_name);
2032
2033 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
2034 file_fid->fid, attr_fid->fid, attr_name);
2035 if (IS_ERR(req)) {
2036 err = PTR_ERR(req);
2037 goto error;
2038 }
2039 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
2040 if (err) {
2041 trace_9p_protocol_dump(clnt, req->rc);
2042 p9_free_req(clnt, req);
2043 goto clunk_fid;
2044 }
2045 p9_free_req(clnt, req);
2046 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2047 attr_fid->fid, *attr_size);
2048 return attr_fid;
2049 clunk_fid:
2050 p9_client_clunk(attr_fid);
2051 attr_fid = NULL;
2052 error:
2053 if (attr_fid && (attr_fid != file_fid))
2054 p9_fid_destroy(attr_fid);
2055
2056 return ERR_PTR(err);
2057 }
2058 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2059
2060 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2061 u64 attr_size, int flags)
2062 {
2063 int err;
2064 struct p9_req_t *req;
2065 struct p9_client *clnt;
2066
2067 p9_debug(P9_DEBUG_9P,
2068 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2069 fid->fid, name, (long long)attr_size, flags);
2070 err = 0;
2071 clnt = fid->clnt;
2072 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2073 fid->fid, name, attr_size, flags);
2074 if (IS_ERR(req)) {
2075 err = PTR_ERR(req);
2076 goto error;
2077 }
2078 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2079 p9_free_req(clnt, req);
2080 error:
2081 return err;
2082 }
2083 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2084
2085 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2086 {
2087 int err, rsize, non_zc = 0;
2088 struct p9_client *clnt;
2089 struct p9_req_t *req;
2090 char *dataptr;
2091 struct kvec kv = {.iov_base = data, .iov_len = count};
2092 struct iov_iter to;
2093
2094 iov_iter_kvec(&to, READ | ITER_KVEC, &kv, 1, count);
2095
2096 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2097 fid->fid, (unsigned long long) offset, count);
2098
2099 err = 0;
2100 clnt = fid->clnt;
2101
2102 rsize = fid->iounit;
2103 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2104 rsize = clnt->msize - P9_READDIRHDRSZ;
2105
2106 if (count < rsize)
2107 rsize = count;
2108
2109 /* Don't bother zerocopy for small IO (< 1024) */
2110 if (clnt->trans_mod->zc_request && rsize > 1024) {
2111 /*
2112 * response header len is 11
2113 * PDU Header(7) + IO Size (4)
2114 */
2115 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0,
2116 11, "dqd", fid->fid, offset, rsize);
2117 } else {
2118 non_zc = 1;
2119 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2120 offset, rsize);
2121 }
2122 if (IS_ERR(req)) {
2123 err = PTR_ERR(req);
2124 goto error;
2125 }
2126
2127 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2128 if (err) {
2129 trace_9p_protocol_dump(clnt, req->rc);
2130 goto free_and_error;
2131 }
2132 if (rsize < count) {
2133 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize);
2134 count = rsize;
2135 }
2136
2137 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2138
2139 if (non_zc)
2140 memmove(data, dataptr, count);
2141
2142 p9_free_req(clnt, req);
2143 return count;
2144
2145 free_and_error:
2146 p9_free_req(clnt, req);
2147 error:
2148 return err;
2149 }
2150 EXPORT_SYMBOL(p9_client_readdir);
2151
2152 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode,
2153 dev_t rdev, kgid_t gid, struct p9_qid *qid)
2154 {
2155 int err;
2156 struct p9_client *clnt;
2157 struct p9_req_t *req;
2158
2159 err = 0;
2160 clnt = fid->clnt;
2161 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2162 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2163 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2164 MAJOR(rdev), MINOR(rdev), gid);
2165 if (IS_ERR(req))
2166 return PTR_ERR(req);
2167
2168 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2169 if (err) {
2170 trace_9p_protocol_dump(clnt, req->rc);
2171 goto error;
2172 }
2173 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2174 (unsigned long long)qid->path, qid->version);
2175
2176 error:
2177 p9_free_req(clnt, req);
2178 return err;
2179
2180 }
2181 EXPORT_SYMBOL(p9_client_mknod_dotl);
2182
2183 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode,
2184 kgid_t gid, struct p9_qid *qid)
2185 {
2186 int err;
2187 struct p9_client *clnt;
2188 struct p9_req_t *req;
2189
2190 err = 0;
2191 clnt = fid->clnt;
2192 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2193 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2194 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
2195 gid);
2196 if (IS_ERR(req))
2197 return PTR_ERR(req);
2198
2199 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2200 if (err) {
2201 trace_9p_protocol_dump(clnt, req->rc);
2202 goto error;
2203 }
2204 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2205 (unsigned long long)qid->path, qid->version);
2206
2207 error:
2208 p9_free_req(clnt, req);
2209 return err;
2210
2211 }
2212 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2213
2214 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2215 {
2216 int err;
2217 struct p9_client *clnt;
2218 struct p9_req_t *req;
2219
2220 err = 0;
2221 clnt = fid->clnt;
2222 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2223 "start %lld length %lld proc_id %d client_id %s\n",
2224 fid->fid, flock->type, flock->flags, flock->start,
2225 flock->length, flock->proc_id, flock->client_id);
2226
2227 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2228 flock->flags, flock->start, flock->length,
2229 flock->proc_id, flock->client_id);
2230
2231 if (IS_ERR(req))
2232 return PTR_ERR(req);
2233
2234 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2235 if (err) {
2236 trace_9p_protocol_dump(clnt, req->rc);
2237 goto error;
2238 }
2239 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2240 error:
2241 p9_free_req(clnt, req);
2242 return err;
2243
2244 }
2245 EXPORT_SYMBOL(p9_client_lock_dotl);
2246
2247 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2248 {
2249 int err;
2250 struct p9_client *clnt;
2251 struct p9_req_t *req;
2252
2253 err = 0;
2254 clnt = fid->clnt;
2255 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2256 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2257 glock->start, glock->length, glock->proc_id, glock->client_id);
2258
2259 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2260 glock->start, glock->length, glock->proc_id, glock->client_id);
2261
2262 if (IS_ERR(req))
2263 return PTR_ERR(req);
2264
2265 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2266 &glock->start, &glock->length, &glock->proc_id,
2267 &glock->client_id);
2268 if (err) {
2269 trace_9p_protocol_dump(clnt, req->rc);
2270 goto error;
2271 }
2272 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2273 "proc_id %d client_id %s\n", glock->type, glock->start,
2274 glock->length, glock->proc_id, glock->client_id);
2275 error:
2276 p9_free_req(clnt, req);
2277 return err;
2278 }
2279 EXPORT_SYMBOL(p9_client_getlock_dotl);
2280
2281 int p9_client_readlink(struct p9_fid *fid, char **target)
2282 {
2283 int err;
2284 struct p9_client *clnt;
2285 struct p9_req_t *req;
2286
2287 err = 0;
2288 clnt = fid->clnt;
2289 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2290
2291 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2292 if (IS_ERR(req))
2293 return PTR_ERR(req);
2294
2295 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2296 if (err) {
2297 trace_9p_protocol_dump(clnt, req->rc);
2298 goto error;
2299 }
2300 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2301 error:
2302 p9_free_req(clnt, req);
2303 return err;
2304 }
2305 EXPORT_SYMBOL(p9_client_readlink);
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