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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / net / 9p / client.c
blobb433aff5ff13ce9e10cddc204f97f9f19ae6c979
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 clnt->trans_mod = v9fs_get_trans_by_name(s);
195 if (clnt->trans_mod == NULL) {
196 pr_info("Could not find request transport: %s\n",
197 s);
198 ret = -EINVAL;
199 kfree(s);
200 goto free_and_return;
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 ret = get_protocol_version(s);
216 if (ret == -EINVAL) {
217 kfree(s);
218 goto free_and_return;
219 }
220 kfree(s);
221 clnt->proto_version = ret;
222 break;
223 default:
224 continue;
225 }
226 }
227
228 free_and_return:
229 kfree(tmp_options);
230 return ret;
231 }
232
233 static struct p9_fcall *p9_fcall_alloc(int alloc_msize)
234 {
235 struct p9_fcall *fc;
236 fc = kmalloc(sizeof(struct p9_fcall) + alloc_msize, GFP_NOFS);
237 if (!fc)
238 return NULL;
239 fc->capacity = alloc_msize;
240 fc->sdata = (char *) fc + sizeof(struct p9_fcall);
241 return fc;
242 }
243
244 /**
245 * p9_tag_alloc - lookup/allocate a request by tag
246 * @c: client session to lookup tag within
247 * @tag: numeric id for transaction
248 *
249 * this is a simple array lookup, but will grow the
250 * request_slots as necessary to accommodate transaction
251 * ids which did not previously have a slot.
252 *
253 * this code relies on the client spinlock to manage locks, its
254 * possible we should switch to something else, but I'd rather
255 * stick with something low-overhead for the common case.
256 *
257 */
258
259 static struct p9_req_t *
260 p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
261 {
262 unsigned long flags;
263 int row, col;
264 struct p9_req_t *req;
265 int alloc_msize = min(c->msize, max_size);
266
267 /* This looks up the original request by tag so we know which
268 * buffer to read the data into */
269 tag++;
270
271 if (tag >= c->max_tag) {
272 spin_lock_irqsave(&c->lock, flags);
273 /* check again since original check was outside of lock */
274 while (tag >= c->max_tag) {
275 row = (tag / P9_ROW_MAXTAG);
276 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
277 sizeof(struct p9_req_t), GFP_ATOMIC);
278
279 if (!c->reqs[row]) {
280 pr_err("Couldn't grow tag array\n");
281 spin_unlock_irqrestore(&c->lock, flags);
282 return ERR_PTR(-ENOMEM);
283 }
284 for (col = 0; col < P9_ROW_MAXTAG; col++) {
285 c->reqs[row][col].status = REQ_STATUS_IDLE;
286 c->reqs[row][col].tc = NULL;
287 }
288 c->max_tag += P9_ROW_MAXTAG;
289 }
290 spin_unlock_irqrestore(&c->lock, flags);
291 }
292 row = tag / P9_ROW_MAXTAG;
293 col = tag % P9_ROW_MAXTAG;
294
295 req = &c->reqs[row][col];
296 if (!req->wq) {
297 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
298 if (!req->wq)
299 goto grow_failed;
300 init_waitqueue_head(req->wq);
301 }
302
303 if (!req->tc)
304 req->tc = p9_fcall_alloc(alloc_msize);
305 if (!req->rc)
306 req->rc = p9_fcall_alloc(alloc_msize);
307 if (!req->tc || !req->rc)
308 goto grow_failed;
309
310 p9pdu_reset(req->tc);
311 p9pdu_reset(req->rc);
312
313 req->tc->tag = tag-1;
314 req->status = REQ_STATUS_ALLOC;
315
316 return req;
317
318 grow_failed:
319 pr_err("Couldn't grow tag array\n");
320 kfree(req->tc);
321 kfree(req->rc);
322 kfree(req->wq);
323 req->tc = req->rc = NULL;
324 req->wq = NULL;
325 return ERR_PTR(-ENOMEM);
326 }
327
328 /**
329 * p9_tag_lookup - lookup a request by tag
330 * @c: client session to lookup tag within
331 * @tag: numeric id for transaction
332 *
333 */
334
335 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
336 {
337 int row, col;
338
339 /* This looks up the original request by tag so we know which
340 * buffer to read the data into */
341 tag++;
342
343 if(tag >= c->max_tag)
344 return NULL;
345
346 row = tag / P9_ROW_MAXTAG;
347 col = tag % P9_ROW_MAXTAG;
348
349 return &c->reqs[row][col];
350 }
351 EXPORT_SYMBOL(p9_tag_lookup);
352
353 /**
354 * p9_tag_init - setup tags structure and contents
355 * @c: v9fs client struct
356 *
357 * This initializes the tags structure for each client instance.
358 *
359 */
360
361 static int p9_tag_init(struct p9_client *c)
362 {
363 int err = 0;
364
365 c->tagpool = p9_idpool_create();
366 if (IS_ERR(c->tagpool)) {
367 err = PTR_ERR(c->tagpool);
368 goto error;
369 }
370 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
371 if (err < 0) {
372 p9_idpool_destroy(c->tagpool);
373 goto error;
374 }
375 c->max_tag = 0;
376 error:
377 return err;
378 }
379
380 /**
381 * p9_tag_cleanup - cleans up tags structure and reclaims resources
382 * @c: v9fs client struct
383 *
384 * This frees resources associated with the tags structure
385 *
386 */
387 static void p9_tag_cleanup(struct p9_client *c)
388 {
389 int row, col;
390
391 /* check to insure all requests are idle */
392 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
393 for (col = 0; col < P9_ROW_MAXTAG; col++) {
394 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
395 p9_debug(P9_DEBUG_MUX,
396 "Attempting to cleanup non-free tag %d,%d\n",
397 row, col);
398 /* TODO: delay execution of cleanup */
399 return;
400 }
401 }
402 }
403
404 if (c->tagpool) {
405 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
406 p9_idpool_destroy(c->tagpool);
407 }
408
409 /* free requests associated with tags */
410 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
411 for (col = 0; col < P9_ROW_MAXTAG; col++) {
412 kfree(c->reqs[row][col].wq);
413 kfree(c->reqs[row][col].tc);
414 kfree(c->reqs[row][col].rc);
415 }
416 kfree(c->reqs[row]);
417 }
418 c->max_tag = 0;
419 }
420
421 /**
422 * p9_free_req - free a request and clean-up as necessary
423 * c: client state
424 * r: request to release
425 *
426 */
427
428 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
429 {
430 int tag = r->tc->tag;
431 p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
432
433 r->status = REQ_STATUS_IDLE;
434 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
435 p9_idpool_put(tag, c->tagpool);
436 }
437
438 /**
439 * p9_client_cb - call back from transport to client
440 * c: client state
441 * req: request received
442 *
443 */
444 void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status)
445 {
446 p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
447
448 /*
449 * This barrier is needed to make sure any change made to req before
450 * the other thread wakes up will indeed be seen by the waiting side.
451 */
452 smp_wmb();
453 req->status = status;
454
455 wake_up(req->wq);
456 p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
457 }
458 EXPORT_SYMBOL(p9_client_cb);
459
460 /**
461 * p9_parse_header - parse header arguments out of a packet
462 * @pdu: packet to parse
463 * @size: size of packet
464 * @type: type of request
465 * @tag: tag of packet
466 * @rewind: set if we need to rewind offset afterwards
467 */
468
469 int
470 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
471 int rewind)
472 {
473 int8_t r_type;
474 int16_t r_tag;
475 int32_t r_size;
476 int offset = pdu->offset;
477 int err;
478
479 pdu->offset = 0;
480 if (pdu->size == 0)
481 pdu->size = 7;
482
483 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
484 if (err)
485 goto rewind_and_exit;
486
487 pdu->size = r_size;
488 pdu->id = r_type;
489 pdu->tag = r_tag;
490
491 p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n",
492 pdu->size, pdu->id, pdu->tag);
493
494 if (type)
495 *type = r_type;
496 if (tag)
497 *tag = r_tag;
498 if (size)
499 *size = r_size;
500
501
502 rewind_and_exit:
503 if (rewind)
504 pdu->offset = offset;
505 return err;
506 }
507 EXPORT_SYMBOL(p9_parse_header);
508
509 /**
510 * p9_check_errors - check 9p packet for error return and process it
511 * @c: current client instance
512 * @req: request to parse and check for error conditions
513 *
514 * returns error code if one is discovered, otherwise returns 0
515 *
516 * this will have to be more complicated if we have multiple
517 * error packet types
518 */
519
520 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
521 {
522 int8_t type;
523 int err;
524 int ecode;
525
526 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
527 /*
528 * dump the response from server
529 * This should be after check errors which poplulate pdu_fcall.
530 */
531 trace_9p_protocol_dump(c, req->rc);
532 if (err) {
533 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
534 return err;
535 }
536 if (type != P9_RERROR && type != P9_RLERROR)
537 return 0;
538
539 if (!p9_is_proto_dotl(c)) {
540 char *ename;
541 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
542 &ename, &ecode);
543 if (err)
544 goto out_err;
545
546 if (p9_is_proto_dotu(c) && ecode < 512)
547 err = -ecode;
548
549 if (!err) {
550 err = p9_errstr2errno(ename, strlen(ename));
551
552 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
553 -ecode, ename);
554 }
555 kfree(ename);
556 } else {
557 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
558 err = -ecode;
559
560 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
561 }
562
563 return err;
564
565 out_err:
566 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
567
568 return err;
569 }
570
571 /**
572 * p9_check_zc_errors - check 9p packet for error return and process it
573 * @c: current client instance
574 * @req: request to parse and check for error conditions
575 * @in_hdrlen: Size of response protocol buffer.
576 *
577 * returns error code if one is discovered, otherwise returns 0
578 *
579 * this will have to be more complicated if we have multiple
580 * error packet types
581 */
582
583 static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req,
584 struct iov_iter *uidata, int in_hdrlen)
585 {
586 int err;
587 int ecode;
588 int8_t type;
589 char *ename = NULL;
590
591 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
592 /*
593 * dump the response from server
594 * This should be after parse_header which poplulate pdu_fcall.
595 */
596 trace_9p_protocol_dump(c, req->rc);
597 if (err) {
598 p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
599 return err;
600 }
601
602 if (type != P9_RERROR && type != P9_RLERROR)
603 return 0;
604
605 if (!p9_is_proto_dotl(c)) {
606 /* Error is reported in string format */
607 int len;
608 /* 7 = header size for RERROR; */
609 int inline_len = in_hdrlen - 7;
610
611 len = req->rc->size - req->rc->offset;
612 if (len > (P9_ZC_HDR_SZ - 7)) {
613 err = -EFAULT;
614 goto out_err;
615 }
616
617 ename = &req->rc->sdata[req->rc->offset];
618 if (len > inline_len) {
619 /* We have error in external buffer */
620 if (!copy_from_iter_full(ename + inline_len,
621 len - inline_len, uidata)) {
622 err = -EFAULT;
623 goto out_err;
624 }
625 }
626 ename = NULL;
627 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
628 &ename, &ecode);
629 if (err)
630 goto out_err;
631
632 if (p9_is_proto_dotu(c) && ecode < 512)
633 err = -ecode;
634
635 if (!err) {
636 err = p9_errstr2errno(ename, strlen(ename));
637
638 p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
639 -ecode, ename);
640 }
641 kfree(ename);
642 } else {
643 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
644 err = -ecode;
645
646 p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
647 }
648 return err;
649
650 out_err:
651 p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
652 return err;
653 }
654
655 static struct p9_req_t *
656 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
657
658 /**
659 * p9_client_flush - flush (cancel) a request
660 * @c: client state
661 * @oldreq: request to cancel
662 *
663 * This sents a flush for a particular request and links
664 * the flush request to the original request. The current
665 * code only supports a single flush request although the protocol
666 * allows for multiple flush requests to be sent for a single request.
667 *
668 */
669
670 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
671 {
672 struct p9_req_t *req;
673 int16_t oldtag;
674 int err;
675
676 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
677 if (err)
678 return err;
679
680 p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
681
682 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
683 if (IS_ERR(req))
684 return PTR_ERR(req);
685
686 /*
687 * if we haven't received a response for oldreq,
688 * remove it from the list
689 */
690 if (oldreq->status == REQ_STATUS_SENT)
691 if (c->trans_mod->cancelled)
692 c->trans_mod->cancelled(c, oldreq);
693
694 p9_free_req(c, req);
695 return 0;
696 }
697
698 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
699 int8_t type, int req_size,
700 const char *fmt, va_list ap)
701 {
702 int tag, err;
703 struct p9_req_t *req;
704
705 p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type);
706
707 /* we allow for any status other than disconnected */
708 if (c->status == Disconnected)
709 return ERR_PTR(-EIO);
710
711 /* if status is begin_disconnected we allow only clunk request */
712 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
713 return ERR_PTR(-EIO);
714
715 tag = P9_NOTAG;
716 if (type != P9_TVERSION) {
717 tag = p9_idpool_get(c->tagpool);
718 if (tag < 0)
719 return ERR_PTR(-ENOMEM);
720 }
721
722 req = p9_tag_alloc(c, tag, req_size);
723 if (IS_ERR(req))
724 return req;
725
726 /* marshall the data */
727 p9pdu_prepare(req->tc, tag, type);
728 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
729 if (err)
730 goto reterr;
731 p9pdu_finalize(c, req->tc);
732 trace_9p_client_req(c, type, tag);
733 return req;
734 reterr:
735 p9_free_req(c, req);
736 return ERR_PTR(err);
737 }
738
739 /**
740 * p9_client_rpc - issue a request and wait for a response
741 * @c: client session
742 * @type: type of request
743 * @fmt: protocol format string (see protocol.c)
744 *
745 * Returns request structure (which client must free using p9_free_req)
746 */
747
748 static struct p9_req_t *
749 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
750 {
751 va_list ap;
752 int sigpending, err;
753 unsigned long flags;
754 struct p9_req_t *req;
755
756 va_start(ap, fmt);
757 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
758 va_end(ap);
759 if (IS_ERR(req))
760 return req;
761
762 if (signal_pending(current)) {
763 sigpending = 1;
764 clear_thread_flag(TIF_SIGPENDING);
765 } else
766 sigpending = 0;
767
768 err = c->trans_mod->request(c, req);
769 if (err < 0) {
770 if (err != -ERESTARTSYS && err != -EFAULT)
771 c->status = Disconnected;
772 goto reterr;
773 }
774 again:
775 /* Wait for the response */
776 err = wait_event_killable(*req->wq, req->status >= REQ_STATUS_RCVD);
777
778 /*
779 * Make sure our req is coherent with regard to updates in other
780 * threads - echoes to wmb() in the callback
781 */
782 smp_rmb();
783
784 if ((err == -ERESTARTSYS) && (c->status == Connected)
785 && (type == P9_TFLUSH)) {
786 sigpending = 1;
787 clear_thread_flag(TIF_SIGPENDING);
788 goto again;
789 }
790
791 if (req->status == REQ_STATUS_ERROR) {
792 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
793 err = req->t_err;
794 }
795 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
796 p9_debug(P9_DEBUG_MUX, "flushing\n");
797 sigpending = 1;
798 clear_thread_flag(TIF_SIGPENDING);
799
800 if (c->trans_mod->cancel(c, req))
801 p9_client_flush(c, req);
802
803 /* if we received the response anyway, don't signal error */
804 if (req->status == REQ_STATUS_RCVD)
805 err = 0;
806 }
807 if (sigpending) {
808 spin_lock_irqsave(&current->sighand->siglock, flags);
809 recalc_sigpending();
810 spin_unlock_irqrestore(&current->sighand->siglock, flags);
811 }
812 if (err < 0)
813 goto reterr;
814
815 err = p9_check_errors(c, req);
816 trace_9p_client_res(c, type, req->rc->tag, err);
817 if (!err)
818 return req;
819 reterr:
820 p9_free_req(c, req);
821 return ERR_PTR(safe_errno(err));
822 }
823
824 /**
825 * p9_client_zc_rpc - issue a request and wait for a response
826 * @c: client session
827 * @type: type of request
828 * @uidata: destination for zero copy read
829 * @uodata: source for zero copy write
830 * @inlen: read buffer size
831 * @olen: write buffer size
832 * @hdrlen: reader header size, This is the size of response protocol data
833 * @fmt: protocol format string (see protocol.c)
834 *
835 * Returns request structure (which client must free using p9_free_req)
836 */
837 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
838 struct iov_iter *uidata,
839 struct iov_iter *uodata,
840 int inlen, int olen, int in_hdrlen,
841 const char *fmt, ...)
842 {
843 va_list ap;
844 int sigpending, err;
845 unsigned long flags;
846 struct p9_req_t *req;
847
848 va_start(ap, fmt);
849 /*
850 * We allocate a inline protocol data of only 4k bytes.
851 * The actual content is passed in zero-copy fashion.
852 */
853 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
854 va_end(ap);
855 if (IS_ERR(req))
856 return req;
857
858 if (signal_pending(current)) {
859 sigpending = 1;
860 clear_thread_flag(TIF_SIGPENDING);
861 } else
862 sigpending = 0;
863
864 err = c->trans_mod->zc_request(c, req, uidata, uodata,
865 inlen, olen, in_hdrlen);
866 if (err < 0) {
867 if (err == -EIO)
868 c->status = Disconnected;
869 if (err != -ERESTARTSYS)
870 goto reterr;
871 }
872 if (req->status == REQ_STATUS_ERROR) {
873 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
874 err = req->t_err;
875 }
876 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
877 p9_debug(P9_DEBUG_MUX, "flushing\n");
878 sigpending = 1;
879 clear_thread_flag(TIF_SIGPENDING);
880
881 if (c->trans_mod->cancel(c, req))
882 p9_client_flush(c, req);
883
884 /* if we received the response anyway, don't signal error */
885 if (req->status == REQ_STATUS_RCVD)
886 err = 0;
887 }
888 if (sigpending) {
889 spin_lock_irqsave(&current->sighand->siglock, flags);
890 recalc_sigpending();
891 spin_unlock_irqrestore(&current->sighand->siglock, flags);
892 }
893 if (err < 0)
894 goto reterr;
895
896 err = p9_check_zc_errors(c, req, uidata, in_hdrlen);
897 trace_9p_client_res(c, type, req->rc->tag, err);
898 if (!err)
899 return req;
900 reterr:
901 p9_free_req(c, req);
902 return ERR_PTR(safe_errno(err));
903 }
904
905 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
906 {
907 int ret;
908 struct p9_fid *fid;
909 unsigned long flags;
910
911 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
912 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
913 if (!fid)
914 return ERR_PTR(-ENOMEM);
915
916 ret = p9_idpool_get(clnt->fidpool);
917 if (ret < 0) {
918 ret = -ENOSPC;
919 goto error;
920 }
921 fid->fid = ret;
922
923 memset(&fid->qid, 0, sizeof(struct p9_qid));
924 fid->mode = -1;
925 fid->uid = current_fsuid();
926 fid->clnt = clnt;
927 fid->rdir = NULL;
928 spin_lock_irqsave(&clnt->lock, flags);
929 list_add(&fid->flist, &clnt->fidlist);
930 spin_unlock_irqrestore(&clnt->lock, flags);
931
932 return fid;
933
934 error:
935 kfree(fid);
936 return ERR_PTR(ret);
937 }
938
939 static void p9_fid_destroy(struct p9_fid *fid)
940 {
941 struct p9_client *clnt;
942 unsigned long flags;
943
944 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
945 clnt = fid->clnt;
946 p9_idpool_put(fid->fid, clnt->fidpool);
947 spin_lock_irqsave(&clnt->lock, flags);
948 list_del(&fid->flist);
949 spin_unlock_irqrestore(&clnt->lock, flags);
950 kfree(fid->rdir);
951 kfree(fid);
952 }
953
954 static int p9_client_version(struct p9_client *c)
955 {
956 int err = 0;
957 struct p9_req_t *req;
958 char *version;
959 int msize;
960
961 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
962 c->msize, c->proto_version);
963
964 switch (c->proto_version) {
965 case p9_proto_2000L:
966 req = p9_client_rpc(c, P9_TVERSION, "ds",
967 c->msize, "9P2000.L");
968 break;
969 case p9_proto_2000u:
970 req = p9_client_rpc(c, P9_TVERSION, "ds",
971 c->msize, "9P2000.u");
972 break;
973 case p9_proto_legacy:
974 req = p9_client_rpc(c, P9_TVERSION, "ds",
975 c->msize, "9P2000");
976 break;
977 default:
978 return -EINVAL;
979 }
980
981 if (IS_ERR(req))
982 return PTR_ERR(req);
983
984 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
985 if (err) {
986 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
987 trace_9p_protocol_dump(c, req->rc);
988 goto error;
989 }
990
991 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
992 if (!strncmp(version, "9P2000.L", 8))
993 c->proto_version = p9_proto_2000L;
994 else if (!strncmp(version, "9P2000.u", 8))
995 c->proto_version = p9_proto_2000u;
996 else if (!strncmp(version, "9P2000", 6))
997 c->proto_version = p9_proto_legacy;
998 else {
999 err = -EREMOTEIO;
1000 goto error;
1001 }
1002
1003 if (msize < c->msize)
1004 c->msize = msize;
1005
1006 error:
1007 kfree(version);
1008 p9_free_req(c, req);
1009
1010 return err;
1011 }
1012
1013 struct p9_client *p9_client_create(const char *dev_name, char *options)
1014 {
1015 int err;
1016 struct p9_client *clnt;
1017 char *client_id;
1018
1019 err = 0;
1020 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
1021 if (!clnt)
1022 return ERR_PTR(-ENOMEM);
1023
1024 clnt->trans_mod = NULL;
1025 clnt->trans = NULL;
1026
1027 client_id = utsname()->nodename;
1028 memcpy(clnt->name, client_id, strlen(client_id) + 1);
1029
1030 spin_lock_init(&clnt->lock);
1031 INIT_LIST_HEAD(&clnt->fidlist);
1032
1033 err = p9_tag_init(clnt);
1034 if (err < 0)
1035 goto free_client;
1036
1037 err = parse_opts(options, clnt);
1038 if (err < 0)
1039 goto destroy_tagpool;
1040
1041 if (!clnt->trans_mod)
1042 clnt->trans_mod = v9fs_get_default_trans();
1043
1044 if (clnt->trans_mod == NULL) {
1045 err = -EPROTONOSUPPORT;
1046 p9_debug(P9_DEBUG_ERROR,
1047 "No transport defined or default transport\n");
1048 goto destroy_tagpool;
1049 }
1050
1051 clnt->fidpool = p9_idpool_create();
1052 if (IS_ERR(clnt->fidpool)) {
1053 err = PTR_ERR(clnt->fidpool);
1054 goto put_trans;
1055 }
1056
1057 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1058 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1059
1060 err = clnt->trans_mod->create(clnt, dev_name, options);
1061 if (err)
1062 goto destroy_fidpool;
1063
1064 if (clnt->msize > clnt->trans_mod->maxsize)
1065 clnt->msize = clnt->trans_mod->maxsize;
1066
1067 err = p9_client_version(clnt);
1068 if (err)
1069 goto close_trans;
1070
1071 return clnt;
1072
1073 close_trans:
1074 clnt->trans_mod->close(clnt);
1075 destroy_fidpool:
1076 p9_idpool_destroy(clnt->fidpool);
1077 put_trans:
1078 v9fs_put_trans(clnt->trans_mod);
1079 destroy_tagpool:
1080 p9_idpool_destroy(clnt->tagpool);
1081 free_client:
1082 kfree(clnt);
1083 return ERR_PTR(err);
1084 }
1085 EXPORT_SYMBOL(p9_client_create);
1086
1087 void p9_client_destroy(struct p9_client *clnt)
1088 {
1089 struct p9_fid *fid, *fidptr;
1090
1091 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1092
1093 if (clnt->trans_mod)
1094 clnt->trans_mod->close(clnt);
1095
1096 v9fs_put_trans(clnt->trans_mod);
1097
1098 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
1099 pr_info("Found fid %d not clunked\n", fid->fid);
1100 p9_fid_destroy(fid);
1101 }
1102
1103 if (clnt->fidpool)
1104 p9_idpool_destroy(clnt->fidpool);
1105
1106 p9_tag_cleanup(clnt);
1107
1108 kfree(clnt);
1109 }
1110 EXPORT_SYMBOL(p9_client_destroy);
1111
1112 void p9_client_disconnect(struct p9_client *clnt)
1113 {
1114 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1115 clnt->status = Disconnected;
1116 }
1117 EXPORT_SYMBOL(p9_client_disconnect);
1118
1119 void p9_client_begin_disconnect(struct p9_client *clnt)
1120 {
1121 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1122 clnt->status = BeginDisconnect;
1123 }
1124 EXPORT_SYMBOL(p9_client_begin_disconnect);
1125
1126 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1127 const char *uname, kuid_t n_uname, const char *aname)
1128 {
1129 int err = 0;
1130 struct p9_req_t *req;
1131 struct p9_fid *fid;
1132 struct p9_qid qid;
1133
1134
1135 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1136 afid ? afid->fid : -1, uname, aname);
1137 fid = p9_fid_create(clnt);
1138 if (IS_ERR(fid)) {
1139 err = PTR_ERR(fid);
1140 fid = NULL;
1141 goto error;
1142 }
1143 fid->uid = n_uname;
1144
1145 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1146 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1147 if (IS_ERR(req)) {
1148 err = PTR_ERR(req);
1149 goto error;
1150 }
1151
1152 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
1153 if (err) {
1154 trace_9p_protocol_dump(clnt, req->rc);
1155 p9_free_req(clnt, req);
1156 goto error;
1157 }
1158
1159 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1160 qid.type, (unsigned long long)qid.path, qid.version);
1161
1162 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1163
1164 p9_free_req(clnt, req);
1165 return fid;
1166
1167 error:
1168 if (fid)
1169 p9_fid_destroy(fid);
1170 return ERR_PTR(err);
1171 }
1172 EXPORT_SYMBOL(p9_client_attach);
1173
1174 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1175 const unsigned char * const *wnames, int clone)
1176 {
1177 int err;
1178 struct p9_client *clnt;
1179 struct p9_fid *fid;
1180 struct p9_qid *wqids;
1181 struct p9_req_t *req;
1182 uint16_t nwqids, count;
1183
1184 err = 0;
1185 wqids = NULL;
1186 clnt = oldfid->clnt;
1187 if (clone) {
1188 fid = p9_fid_create(clnt);
1189 if (IS_ERR(fid)) {
1190 err = PTR_ERR(fid);
1191 fid = NULL;
1192 goto error;
1193 }
1194
1195 fid->uid = oldfid->uid;
1196 } else
1197 fid = oldfid;
1198
1199
1200 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1201 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1202
1203 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1204 nwname, wnames);
1205 if (IS_ERR(req)) {
1206 err = PTR_ERR(req);
1207 goto error;
1208 }
1209
1210 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1211 if (err) {
1212 trace_9p_protocol_dump(clnt, req->rc);
1213 p9_free_req(clnt, req);
1214 goto clunk_fid;
1215 }
1216 p9_free_req(clnt, req);
1217
1218 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1219
1220 if (nwqids != nwname) {
1221 err = -ENOENT;
1222 goto clunk_fid;
1223 }
1224
1225 for (count = 0; count < nwqids; count++)
1226 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1227 count, wqids[count].type,
1228 (unsigned long long)wqids[count].path,
1229 wqids[count].version);
1230
1231 if (nwname)
1232 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1233 else
1234 fid->qid = oldfid->qid;
1235
1236 kfree(wqids);
1237 return fid;
1238
1239 clunk_fid:
1240 kfree(wqids);
1241 p9_client_clunk(fid);
1242 fid = NULL;
1243
1244 error:
1245 if (fid && (fid != oldfid))
1246 p9_fid_destroy(fid);
1247
1248 return ERR_PTR(err);
1249 }
1250 EXPORT_SYMBOL(p9_client_walk);
1251
1252 int p9_client_open(struct p9_fid *fid, int mode)
1253 {
1254 int err;
1255 struct p9_client *clnt;
1256 struct p9_req_t *req;
1257 struct p9_qid qid;
1258 int iounit;
1259
1260 clnt = fid->clnt;
1261 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1262 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1263 err = 0;
1264
1265 if (fid->mode != -1)
1266 return -EINVAL;
1267
1268 if (p9_is_proto_dotl(clnt))
1269 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1270 else
1271 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1272 if (IS_ERR(req)) {
1273 err = PTR_ERR(req);
1274 goto error;
1275 }
1276
1277 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1278 if (err) {
1279 trace_9p_protocol_dump(clnt, req->rc);
1280 goto free_and_error;
1281 }
1282
1283 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1284 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1285 (unsigned long long)qid.path, qid.version, iounit);
1286
1287 fid->mode = mode;
1288 fid->iounit = iounit;
1289
1290 free_and_error:
1291 p9_free_req(clnt, req);
1292 error:
1293 return err;
1294 }
1295 EXPORT_SYMBOL(p9_client_open);
1296
1297 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode,
1298 kgid_t gid, struct p9_qid *qid)
1299 {
1300 int err = 0;
1301 struct p9_client *clnt;
1302 struct p9_req_t *req;
1303 int iounit;
1304
1305 p9_debug(P9_DEBUG_9P,
1306 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1307 ofid->fid, name, flags, mode,
1308 from_kgid(&init_user_ns, gid));
1309 clnt = ofid->clnt;
1310
1311 if (ofid->mode != -1)
1312 return -EINVAL;
1313
1314 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1315 mode, gid);
1316 if (IS_ERR(req)) {
1317 err = PTR_ERR(req);
1318 goto error;
1319 }
1320
1321 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1322 if (err) {
1323 trace_9p_protocol_dump(clnt, req->rc);
1324 goto free_and_error;
1325 }
1326
1327 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1328 qid->type,
1329 (unsigned long long)qid->path,
1330 qid->version, iounit);
1331
1332 ofid->mode = mode;
1333 ofid->iounit = iounit;
1334
1335 free_and_error:
1336 p9_free_req(clnt, req);
1337 error:
1338 return err;
1339 }
1340 EXPORT_SYMBOL(p9_client_create_dotl);
1341
1342 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode,
1343 char *extension)
1344 {
1345 int err;
1346 struct p9_client *clnt;
1347 struct p9_req_t *req;
1348 struct p9_qid qid;
1349 int iounit;
1350
1351 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1352 fid->fid, name, perm, mode);
1353 err = 0;
1354 clnt = fid->clnt;
1355
1356 if (fid->mode != -1)
1357 return -EINVAL;
1358
1359 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1360 mode, extension);
1361 if (IS_ERR(req)) {
1362 err = PTR_ERR(req);
1363 goto error;
1364 }
1365
1366 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1367 if (err) {
1368 trace_9p_protocol_dump(clnt, req->rc);
1369 goto free_and_error;
1370 }
1371
1372 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1373 qid.type,
1374 (unsigned long long)qid.path,
1375 qid.version, iounit);
1376
1377 fid->mode = mode;
1378 fid->iounit = iounit;
1379
1380 free_and_error:
1381 p9_free_req(clnt, req);
1382 error:
1383 return err;
1384 }
1385 EXPORT_SYMBOL(p9_client_fcreate);
1386
1387 int p9_client_symlink(struct p9_fid *dfid, const char *name,
1388 const char *symtgt, kgid_t gid, struct p9_qid *qid)
1389 {
1390 int err = 0;
1391 struct p9_client *clnt;
1392 struct p9_req_t *req;
1393
1394 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1395 dfid->fid, name, symtgt);
1396 clnt = dfid->clnt;
1397
1398 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1399 gid);
1400 if (IS_ERR(req)) {
1401 err = PTR_ERR(req);
1402 goto error;
1403 }
1404
1405 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1406 if (err) {
1407 trace_9p_protocol_dump(clnt, req->rc);
1408 goto free_and_error;
1409 }
1410
1411 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1412 qid->type, (unsigned long long)qid->path, qid->version);
1413
1414 free_and_error:
1415 p9_free_req(clnt, req);
1416 error:
1417 return err;
1418 }
1419 EXPORT_SYMBOL(p9_client_symlink);
1420
1421 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname)
1422 {
1423 struct p9_client *clnt;
1424 struct p9_req_t *req;
1425
1426 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1427 dfid->fid, oldfid->fid, newname);
1428 clnt = dfid->clnt;
1429 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1430 newname);
1431 if (IS_ERR(req))
1432 return PTR_ERR(req);
1433
1434 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1435 p9_free_req(clnt, req);
1436 return 0;
1437 }
1438 EXPORT_SYMBOL(p9_client_link);
1439
1440 int p9_client_fsync(struct p9_fid *fid, int datasync)
1441 {
1442 int err;
1443 struct p9_client *clnt;
1444 struct p9_req_t *req;
1445
1446 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1447 fid->fid, datasync);
1448 err = 0;
1449 clnt = fid->clnt;
1450
1451 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1452 if (IS_ERR(req)) {
1453 err = PTR_ERR(req);
1454 goto error;
1455 }
1456
1457 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1458
1459 p9_free_req(clnt, req);
1460
1461 error:
1462 return err;
1463 }
1464 EXPORT_SYMBOL(p9_client_fsync);
1465
1466 int p9_client_clunk(struct p9_fid *fid)
1467 {
1468 int err;
1469 struct p9_client *clnt;
1470 struct p9_req_t *req;
1471 int retries = 0;
1472
1473 if (!fid) {
1474 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1475 __func__, task_pid_nr(current));
1476 dump_stack();
1477 return 0;
1478 }
1479
1480 again:
1481 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1482 retries);
1483 err = 0;
1484 clnt = fid->clnt;
1485
1486 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1487 if (IS_ERR(req)) {
1488 err = PTR_ERR(req);
1489 goto error;
1490 }
1491
1492 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1493
1494 p9_free_req(clnt, req);
1495 error:
1496 /*
1497 * Fid is not valid even after a failed clunk
1498 * If interrupted, retry once then give up and
1499 * leak fid until umount.
1500 */
1501 if (err == -ERESTARTSYS) {
1502 if (retries++ == 0)
1503 goto again;
1504 } else
1505 p9_fid_destroy(fid);
1506 return err;
1507 }
1508 EXPORT_SYMBOL(p9_client_clunk);
1509
1510 int p9_client_remove(struct p9_fid *fid)
1511 {
1512 int err;
1513 struct p9_client *clnt;
1514 struct p9_req_t *req;
1515
1516 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1517 err = 0;
1518 clnt = fid->clnt;
1519
1520 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1521 if (IS_ERR(req)) {
1522 err = PTR_ERR(req);
1523 goto error;
1524 }
1525
1526 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1527
1528 p9_free_req(clnt, req);
1529 error:
1530 if (err == -ERESTARTSYS)
1531 p9_client_clunk(fid);
1532 else
1533 p9_fid_destroy(fid);
1534 return err;
1535 }
1536 EXPORT_SYMBOL(p9_client_remove);
1537
1538 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1539 {
1540 int err = 0;
1541 struct p9_req_t *req;
1542 struct p9_client *clnt;
1543
1544 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1545 dfid->fid, name, flags);
1546
1547 clnt = dfid->clnt;
1548 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1549 if (IS_ERR(req)) {
1550 err = PTR_ERR(req);
1551 goto error;
1552 }
1553 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1554
1555 p9_free_req(clnt, req);
1556 error:
1557 return err;
1558 }
1559 EXPORT_SYMBOL(p9_client_unlinkat);
1560
1561 int
1562 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
1563 {
1564 struct p9_client *clnt = fid->clnt;
1565 struct p9_req_t *req;
1566 int total = 0;
1567 *err = 0;
1568
1569 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1570 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to));
1571
1572 while (iov_iter_count(to)) {
1573 int count = iov_iter_count(to);
1574 int rsize, non_zc = 0;
1575 char *dataptr;
1576
1577 rsize = fid->iounit;
1578 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1579 rsize = clnt->msize - P9_IOHDRSZ;
1580
1581 if (count < rsize)
1582 rsize = count;
1583
1584 /* Don't bother zerocopy for small IO (< 1024) */
1585 if (clnt->trans_mod->zc_request && rsize > 1024) {
1586 /*
1587 * response header len is 11
1588 * PDU Header(7) + IO Size (4)
1589 */
1590 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize,
1591 0, 11, "dqd", fid->fid,
1592 offset, rsize);
1593 } else {
1594 non_zc = 1;
1595 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1596 rsize);
1597 }
1598 if (IS_ERR(req)) {
1599 *err = PTR_ERR(req);
1600 break;
1601 }
1602
1603 *err = p9pdu_readf(req->rc, clnt->proto_version,
1604 "D", &count, &dataptr);
1605 if (*err) {
1606 trace_9p_protocol_dump(clnt, req->rc);
1607 p9_free_req(clnt, req);
1608 break;
1609 }
1610 if (rsize < count) {
1611 pr_err("bogus RREAD count (%d > %d)\n", count, rsize);
1612 count = rsize;
1613 }
1614
1615 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1616 if (!count) {
1617 p9_free_req(clnt, req);
1618 break;
1619 }
1620
1621 if (non_zc) {
1622 int n = copy_to_iter(dataptr, count, to);
1623 total += n;
1624 offset += n;
1625 if (n != count) {
1626 *err = -EFAULT;
1627 p9_free_req(clnt, req);
1628 break;
1629 }
1630 } else {
1631 iov_iter_advance(to, count);
1632 total += count;
1633 offset += count;
1634 }
1635 p9_free_req(clnt, req);
1636 }
1637 return total;
1638 }
1639 EXPORT_SYMBOL(p9_client_read);
1640
1641 int
1642 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
1643 {
1644 struct p9_client *clnt = fid->clnt;
1645 struct p9_req_t *req;
1646 int total = 0;
1647 *err = 0;
1648
1649 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n",
1650 fid->fid, (unsigned long long) offset,
1651 iov_iter_count(from));
1652
1653 while (iov_iter_count(from)) {
1654 int count = iov_iter_count(from);
1655 int rsize = fid->iounit;
1656 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1657 rsize = clnt->msize - P9_IOHDRSZ;
1658
1659 if (count < rsize)
1660 rsize = count;
1661
1662 /* Don't bother zerocopy for small IO (< 1024) */
1663 if (clnt->trans_mod->zc_request && rsize > 1024) {
1664 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0,
1665 rsize, P9_ZC_HDR_SZ, "dqd",
1666 fid->fid, offset, rsize);
1667 } else {
1668 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
1669 offset, rsize, from);
1670 }
1671 if (IS_ERR(req)) {
1672 *err = PTR_ERR(req);
1673 break;
1674 }
1675
1676 *err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1677 if (*err) {
1678 trace_9p_protocol_dump(clnt, req->rc);
1679 p9_free_req(clnt, req);
1680 break;
1681 }
1682 if (rsize < count) {
1683 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize);
1684 count = rsize;
1685 }
1686
1687 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1688
1689 p9_free_req(clnt, req);
1690 iov_iter_advance(from, count);
1691 total += count;
1692 offset += count;
1693 }
1694 return total;
1695 }
1696 EXPORT_SYMBOL(p9_client_write);
1697
1698 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1699 {
1700 int err;
1701 struct p9_client *clnt;
1702 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1703 struct p9_req_t *req;
1704 u16 ignored;
1705
1706 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1707
1708 if (!ret)
1709 return ERR_PTR(-ENOMEM);
1710
1711 err = 0;
1712 clnt = fid->clnt;
1713
1714 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1715 if (IS_ERR(req)) {
1716 err = PTR_ERR(req);
1717 goto error;
1718 }
1719
1720 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1721 if (err) {
1722 trace_9p_protocol_dump(clnt, req->rc);
1723 p9_free_req(clnt, req);
1724 goto error;
1725 }
1726
1727 p9_debug(P9_DEBUG_9P,
1728 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1729 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1730 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1731 "<<< uid=%d gid=%d n_muid=%d\n",
1732 ret->size, ret->type, ret->dev, ret->qid.type,
1733 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1734 ret->atime, ret->mtime, (unsigned long long)ret->length,
1735 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1736 from_kuid(&init_user_ns, ret->n_uid),
1737 from_kgid(&init_user_ns, ret->n_gid),
1738 from_kuid(&init_user_ns, ret->n_muid));
1739
1740 p9_free_req(clnt, req);
1741 return ret;
1742
1743 error:
1744 kfree(ret);
1745 return ERR_PTR(err);
1746 }
1747 EXPORT_SYMBOL(p9_client_stat);
1748
1749 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1750 u64 request_mask)
1751 {
1752 int err;
1753 struct p9_client *clnt;
1754 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1755 GFP_KERNEL);
1756 struct p9_req_t *req;
1757
1758 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1759 fid->fid, request_mask);
1760
1761 if (!ret)
1762 return ERR_PTR(-ENOMEM);
1763
1764 err = 0;
1765 clnt = fid->clnt;
1766
1767 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1768 if (IS_ERR(req)) {
1769 err = PTR_ERR(req);
1770 goto error;
1771 }
1772
1773 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1774 if (err) {
1775 trace_9p_protocol_dump(clnt, req->rc);
1776 p9_free_req(clnt, req);
1777 goto error;
1778 }
1779
1780 p9_debug(P9_DEBUG_9P,
1781 "<<< RGETATTR st_result_mask=%lld\n"
1782 "<<< qid=%x.%llx.%x\n"
1783 "<<< st_mode=%8.8x st_nlink=%llu\n"
1784 "<<< st_uid=%d st_gid=%d\n"
1785 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1786 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1787 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1788 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1789 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1790 "<<< st_gen=%lld st_data_version=%lld",
1791 ret->st_result_mask, ret->qid.type, ret->qid.path,
1792 ret->qid.version, ret->st_mode, ret->st_nlink,
1793 from_kuid(&init_user_ns, ret->st_uid),
1794 from_kgid(&init_user_ns, ret->st_gid),
1795 ret->st_rdev, ret->st_size, ret->st_blksize,
1796 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1797 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1798 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1799 ret->st_gen, ret->st_data_version);
1800
1801 p9_free_req(clnt, req);
1802 return ret;
1803
1804 error:
1805 kfree(ret);
1806 return ERR_PTR(err);
1807 }
1808 EXPORT_SYMBOL(p9_client_getattr_dotl);
1809
1810 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1811 {
1812 int ret;
1813
1814 /* NOTE: size shouldn't include its own length */
1815 /* size[2] type[2] dev[4] qid[13] */
1816 /* mode[4] atime[4] mtime[4] length[8]*/
1817 /* name[s] uid[s] gid[s] muid[s] */
1818 ret = 2+4+13+4+4+4+8+2+2+2+2;
1819
1820 if (wst->name)
1821 ret += strlen(wst->name);
1822 if (wst->uid)
1823 ret += strlen(wst->uid);
1824 if (wst->gid)
1825 ret += strlen(wst->gid);
1826 if (wst->muid)
1827 ret += strlen(wst->muid);
1828
1829 if ((proto_version == p9_proto_2000u) ||
1830 (proto_version == p9_proto_2000L)) {
1831 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1832 if (wst->extension)
1833 ret += strlen(wst->extension);
1834 }
1835
1836 return ret;
1837 }
1838
1839 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1840 {
1841 int err;
1842 struct p9_req_t *req;
1843 struct p9_client *clnt;
1844
1845 err = 0;
1846 clnt = fid->clnt;
1847 wst->size = p9_client_statsize(wst, clnt->proto_version);
1848 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1849 p9_debug(P9_DEBUG_9P,
1850 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1851 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1852 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1853 " uid=%d gid=%d n_muid=%d\n",
1854 wst->size, wst->type, wst->dev, wst->qid.type,
1855 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1856 wst->atime, wst->mtime, (unsigned long long)wst->length,
1857 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1858 from_kuid(&init_user_ns, wst->n_uid),
1859 from_kgid(&init_user_ns, wst->n_gid),
1860 from_kuid(&init_user_ns, wst->n_muid));
1861
1862 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1863 if (IS_ERR(req)) {
1864 err = PTR_ERR(req);
1865 goto error;
1866 }
1867
1868 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1869
1870 p9_free_req(clnt, req);
1871 error:
1872 return err;
1873 }
1874 EXPORT_SYMBOL(p9_client_wstat);
1875
1876 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1877 {
1878 int err;
1879 struct p9_req_t *req;
1880 struct p9_client *clnt;
1881
1882 err = 0;
1883 clnt = fid->clnt;
1884 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1885 p9_debug(P9_DEBUG_9P,
1886 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1887 " atime_sec=%lld atime_nsec=%lld\n"
1888 " mtime_sec=%lld mtime_nsec=%lld\n",
1889 p9attr->valid, p9attr->mode,
1890 from_kuid(&init_user_ns, p9attr->uid),
1891 from_kgid(&init_user_ns, p9attr->gid),
1892 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1893 p9attr->mtime_sec, p9attr->mtime_nsec);
1894
1895 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1896
1897 if (IS_ERR(req)) {
1898 err = PTR_ERR(req);
1899 goto error;
1900 }
1901 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1902 p9_free_req(clnt, req);
1903 error:
1904 return err;
1905 }
1906 EXPORT_SYMBOL(p9_client_setattr);
1907
1908 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1909 {
1910 int err;
1911 struct p9_req_t *req;
1912 struct p9_client *clnt;
1913
1914 err = 0;
1915 clnt = fid->clnt;
1916
1917 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1918
1919 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1920 if (IS_ERR(req)) {
1921 err = PTR_ERR(req);
1922 goto error;
1923 }
1924
1925 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1926 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1927 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1928 if (err) {
1929 trace_9p_protocol_dump(clnt, req->rc);
1930 p9_free_req(clnt, req);
1931 goto error;
1932 }
1933
1934 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1935 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1936 "fsid %llu namelen %ld\n",
1937 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1938 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1939 sb->fsid, (long int)sb->namelen);
1940
1941 p9_free_req(clnt, req);
1942 error:
1943 return err;
1944 }
1945 EXPORT_SYMBOL(p9_client_statfs);
1946
1947 int p9_client_rename(struct p9_fid *fid,
1948 struct p9_fid *newdirfid, const char *name)
1949 {
1950 int err;
1951 struct p9_req_t *req;
1952 struct p9_client *clnt;
1953
1954 err = 0;
1955 clnt = fid->clnt;
1956
1957 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1958 fid->fid, newdirfid->fid, name);
1959
1960 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1961 newdirfid->fid, name);
1962 if (IS_ERR(req)) {
1963 err = PTR_ERR(req);
1964 goto error;
1965 }
1966
1967 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1968
1969 p9_free_req(clnt, req);
1970 error:
1971 return err;
1972 }
1973 EXPORT_SYMBOL(p9_client_rename);
1974
1975 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1976 struct p9_fid *newdirfid, const char *new_name)
1977 {
1978 int err;
1979 struct p9_req_t *req;
1980 struct p9_client *clnt;
1981
1982 err = 0;
1983 clnt = olddirfid->clnt;
1984
1985 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1986 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1987 newdirfid->fid, new_name);
1988
1989 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1990 old_name, newdirfid->fid, new_name);
1991 if (IS_ERR(req)) {
1992 err = PTR_ERR(req);
1993 goto error;
1994 }
1995
1996 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1997 newdirfid->fid, new_name);
1998
1999 p9_free_req(clnt, req);
2000 error:
2001 return err;
2002 }
2003 EXPORT_SYMBOL(p9_client_renameat);
2004
2005 /*
2006 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
2007 */
2008 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
2009 const char *attr_name, u64 *attr_size)
2010 {
2011 int err;
2012 struct p9_req_t *req;
2013 struct p9_client *clnt;
2014 struct p9_fid *attr_fid;
2015
2016 err = 0;
2017 clnt = file_fid->clnt;
2018 attr_fid = p9_fid_create(clnt);
2019 if (IS_ERR(attr_fid)) {
2020 err = PTR_ERR(attr_fid);
2021 attr_fid = NULL;
2022 goto error;
2023 }
2024 p9_debug(P9_DEBUG_9P,
2025 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
2026 file_fid->fid, attr_fid->fid, attr_name);
2027
2028 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
2029 file_fid->fid, attr_fid->fid, attr_name);
2030 if (IS_ERR(req)) {
2031 err = PTR_ERR(req);
2032 goto error;
2033 }
2034 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
2035 if (err) {
2036 trace_9p_protocol_dump(clnt, req->rc);
2037 p9_free_req(clnt, req);
2038 goto clunk_fid;
2039 }
2040 p9_free_req(clnt, req);
2041 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2042 attr_fid->fid, *attr_size);
2043 return attr_fid;
2044 clunk_fid:
2045 p9_client_clunk(attr_fid);
2046 attr_fid = NULL;
2047 error:
2048 if (attr_fid && (attr_fid != file_fid))
2049 p9_fid_destroy(attr_fid);
2050
2051 return ERR_PTR(err);
2052 }
2053 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2054
2055 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2056 u64 attr_size, int flags)
2057 {
2058 int err;
2059 struct p9_req_t *req;
2060 struct p9_client *clnt;
2061
2062 p9_debug(P9_DEBUG_9P,
2063 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2064 fid->fid, name, (long long)attr_size, flags);
2065 err = 0;
2066 clnt = fid->clnt;
2067 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2068 fid->fid, name, attr_size, flags);
2069 if (IS_ERR(req)) {
2070 err = PTR_ERR(req);
2071 goto error;
2072 }
2073 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2074 p9_free_req(clnt, req);
2075 error:
2076 return err;
2077 }
2078 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2079
2080 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2081 {
2082 int err, rsize, non_zc = 0;
2083 struct p9_client *clnt;
2084 struct p9_req_t *req;
2085 char *dataptr;
2086 struct kvec kv = {.iov_base = data, .iov_len = count};
2087 struct iov_iter to;
2088
2089 iov_iter_kvec(&to, READ | ITER_KVEC, &kv, 1, count);
2090
2091 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2092 fid->fid, (unsigned long long) offset, count);
2093
2094 err = 0;
2095 clnt = fid->clnt;
2096
2097 rsize = fid->iounit;
2098 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2099 rsize = clnt->msize - P9_READDIRHDRSZ;
2100
2101 if (count < rsize)
2102 rsize = count;
2103
2104 /* Don't bother zerocopy for small IO (< 1024) */
2105 if (clnt->trans_mod->zc_request && rsize > 1024) {
2106 /*
2107 * response header len is 11
2108 * PDU Header(7) + IO Size (4)
2109 */
2110 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0,
2111 11, "dqd", fid->fid, offset, rsize);
2112 } else {
2113 non_zc = 1;
2114 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2115 offset, rsize);
2116 }
2117 if (IS_ERR(req)) {
2118 err = PTR_ERR(req);
2119 goto error;
2120 }
2121
2122 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2123 if (err) {
2124 trace_9p_protocol_dump(clnt, req->rc);
2125 goto free_and_error;
2126 }
2127 if (rsize < count) {
2128 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize);
2129 count = rsize;
2130 }
2131
2132 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2133
2134 if (non_zc)
2135 memmove(data, dataptr, count);
2136
2137 p9_free_req(clnt, req);
2138 return count;
2139
2140 free_and_error:
2141 p9_free_req(clnt, req);
2142 error:
2143 return err;
2144 }
2145 EXPORT_SYMBOL(p9_client_readdir);
2146
2147 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode,
2148 dev_t rdev, kgid_t gid, struct p9_qid *qid)
2149 {
2150 int err;
2151 struct p9_client *clnt;
2152 struct p9_req_t *req;
2153
2154 err = 0;
2155 clnt = fid->clnt;
2156 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2157 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2158 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2159 MAJOR(rdev), MINOR(rdev), gid);
2160 if (IS_ERR(req))
2161 return PTR_ERR(req);
2162
2163 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2164 if (err) {
2165 trace_9p_protocol_dump(clnt, req->rc);
2166 goto error;
2167 }
2168 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2169 (unsigned long long)qid->path, qid->version);
2170
2171 error:
2172 p9_free_req(clnt, req);
2173 return err;
2174
2175 }
2176 EXPORT_SYMBOL(p9_client_mknod_dotl);
2177
2178 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode,
2179 kgid_t gid, struct p9_qid *qid)
2180 {
2181 int err;
2182 struct p9_client *clnt;
2183 struct p9_req_t *req;
2184
2185 err = 0;
2186 clnt = fid->clnt;
2187 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2188 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2189 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
2190 gid);
2191 if (IS_ERR(req))
2192 return PTR_ERR(req);
2193
2194 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2195 if (err) {
2196 trace_9p_protocol_dump(clnt, req->rc);
2197 goto error;
2198 }
2199 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2200 (unsigned long long)qid->path, qid->version);
2201
2202 error:
2203 p9_free_req(clnt, req);
2204 return err;
2205
2206 }
2207 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2208
2209 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2210 {
2211 int err;
2212 struct p9_client *clnt;
2213 struct p9_req_t *req;
2214
2215 err = 0;
2216 clnt = fid->clnt;
2217 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2218 "start %lld length %lld proc_id %d client_id %s\n",
2219 fid->fid, flock->type, flock->flags, flock->start,
2220 flock->length, flock->proc_id, flock->client_id);
2221
2222 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2223 flock->flags, flock->start, flock->length,
2224 flock->proc_id, flock->client_id);
2225
2226 if (IS_ERR(req))
2227 return PTR_ERR(req);
2228
2229 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2230 if (err) {
2231 trace_9p_protocol_dump(clnt, req->rc);
2232 goto error;
2233 }
2234 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2235 error:
2236 p9_free_req(clnt, req);
2237 return err;
2238
2239 }
2240 EXPORT_SYMBOL(p9_client_lock_dotl);
2241
2242 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2243 {
2244 int err;
2245 struct p9_client *clnt;
2246 struct p9_req_t *req;
2247
2248 err = 0;
2249 clnt = fid->clnt;
2250 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2251 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2252 glock->start, glock->length, glock->proc_id, glock->client_id);
2253
2254 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2255 glock->start, glock->length, glock->proc_id, glock->client_id);
2256
2257 if (IS_ERR(req))
2258 return PTR_ERR(req);
2259
2260 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2261 &glock->start, &glock->length, &glock->proc_id,
2262 &glock->client_id);
2263 if (err) {
2264 trace_9p_protocol_dump(clnt, req->rc);
2265 goto error;
2266 }
2267 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2268 "proc_id %d client_id %s\n", glock->type, glock->start,
2269 glock->length, glock->proc_id, glock->client_id);
2270 error:
2271 p9_free_req(clnt, req);
2272 return err;
2273 }
2274 EXPORT_SYMBOL(p9_client_getlock_dotl);
2275
2276 int p9_client_readlink(struct p9_fid *fid, char **target)
2277 {
2278 int err;
2279 struct p9_client *clnt;
2280 struct p9_req_t *req;
2281
2282 err = 0;
2283 clnt = fid->clnt;
2284 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2285
2286 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2287 if (IS_ERR(req))
2288 return PTR_ERR(req);
2289
2290 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2291 if (err) {
2292 trace_9p_protocol_dump(clnt, req->rc);
2293 goto error;
2294 }
2295 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2296 error:
2297 p9_free_req(clnt, req);
2298 return err;
2299 }
2300 EXPORT_SYMBOL(p9_client_readlink);
CRIS linux kernel tree