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9p: Implement show_options
[mirror_ubuntu-artful-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 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_interruptible(*req->wq,
777 req->status >= REQ_STATUS_RCVD);
778
779 /*
780 * Make sure our req is coherent with regard to updates in other
781 * threads - echoes to wmb() in the callback
782 */
783 smp_rmb();
784
785 if ((err == -ERESTARTSYS) && (c->status == Connected)
786 && (type == P9_TFLUSH)) {
787 sigpending = 1;
788 clear_thread_flag(TIF_SIGPENDING);
789 goto again;
790 }
791
792 if (req->status == REQ_STATUS_ERROR) {
793 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
794 err = req->t_err;
795 }
796 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
797 p9_debug(P9_DEBUG_MUX, "flushing\n");
798 sigpending = 1;
799 clear_thread_flag(TIF_SIGPENDING);
800
801 if (c->trans_mod->cancel(c, req))
802 p9_client_flush(c, req);
803
804 /* if we received the response anyway, don't signal error */
805 if (req->status == REQ_STATUS_RCVD)
806 err = 0;
807 }
808 if (sigpending) {
809 spin_lock_irqsave(&current->sighand->siglock, flags);
810 recalc_sigpending();
811 spin_unlock_irqrestore(&current->sighand->siglock, flags);
812 }
813 if (err < 0)
814 goto reterr;
815
816 err = p9_check_errors(c, req);
817 trace_9p_client_res(c, type, req->rc->tag, err);
818 if (!err)
819 return req;
820 reterr:
821 p9_free_req(c, req);
822 return ERR_PTR(safe_errno(err));
823 }
824
825 /**
826 * p9_client_zc_rpc - issue a request and wait for a response
827 * @c: client session
828 * @type: type of request
829 * @uidata: destination for zero copy read
830 * @uodata: source for zero copy write
831 * @inlen: read buffer size
832 * @olen: write buffer size
833 * @hdrlen: reader header size, This is the size of response protocol data
834 * @fmt: protocol format string (see protocol.c)
835 *
836 * Returns request structure (which client must free using p9_free_req)
837 */
838 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
839 struct iov_iter *uidata,
840 struct iov_iter *uodata,
841 int inlen, int olen, int in_hdrlen,
842 const char *fmt, ...)
843 {
844 va_list ap;
845 int sigpending, err;
846 unsigned long flags;
847 struct p9_req_t *req;
848
849 va_start(ap, fmt);
850 /*
851 * We allocate a inline protocol data of only 4k bytes.
852 * The actual content is passed in zero-copy fashion.
853 */
854 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
855 va_end(ap);
856 if (IS_ERR(req))
857 return req;
858
859 if (signal_pending(current)) {
860 sigpending = 1;
861 clear_thread_flag(TIF_SIGPENDING);
862 } else
863 sigpending = 0;
864
865 err = c->trans_mod->zc_request(c, req, uidata, uodata,
866 inlen, olen, in_hdrlen);
867 if (err < 0) {
868 if (err == -EIO)
869 c->status = Disconnected;
870 if (err != -ERESTARTSYS)
871 goto reterr;
872 }
873 if (req->status == REQ_STATUS_ERROR) {
874 p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
875 err = req->t_err;
876 }
877 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
878 p9_debug(P9_DEBUG_MUX, "flushing\n");
879 sigpending = 1;
880 clear_thread_flag(TIF_SIGPENDING);
881
882 if (c->trans_mod->cancel(c, req))
883 p9_client_flush(c, req);
884
885 /* if we received the response anyway, don't signal error */
886 if (req->status == REQ_STATUS_RCVD)
887 err = 0;
888 }
889 if (sigpending) {
890 spin_lock_irqsave(&current->sighand->siglock, flags);
891 recalc_sigpending();
892 spin_unlock_irqrestore(&current->sighand->siglock, flags);
893 }
894 if (err < 0)
895 goto reterr;
896
897 err = p9_check_zc_errors(c, req, uidata, in_hdrlen);
898 trace_9p_client_res(c, type, req->rc->tag, err);
899 if (!err)
900 return req;
901 reterr:
902 p9_free_req(c, req);
903 return ERR_PTR(safe_errno(err));
904 }
905
906 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
907 {
908 int ret;
909 struct p9_fid *fid;
910 unsigned long flags;
911
912 p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt);
913 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
914 if (!fid)
915 return ERR_PTR(-ENOMEM);
916
917 ret = p9_idpool_get(clnt->fidpool);
918 if (ret < 0) {
919 ret = -ENOSPC;
920 goto error;
921 }
922 fid->fid = ret;
923
924 memset(&fid->qid, 0, sizeof(struct p9_qid));
925 fid->mode = -1;
926 fid->uid = current_fsuid();
927 fid->clnt = clnt;
928 fid->rdir = NULL;
929 spin_lock_irqsave(&clnt->lock, flags);
930 list_add(&fid->flist, &clnt->fidlist);
931 spin_unlock_irqrestore(&clnt->lock, flags);
932
933 return fid;
934
935 error:
936 kfree(fid);
937 return ERR_PTR(ret);
938 }
939
940 static void p9_fid_destroy(struct p9_fid *fid)
941 {
942 struct p9_client *clnt;
943 unsigned long flags;
944
945 p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid);
946 clnt = fid->clnt;
947 p9_idpool_put(fid->fid, clnt->fidpool);
948 spin_lock_irqsave(&clnt->lock, flags);
949 list_del(&fid->flist);
950 spin_unlock_irqrestore(&clnt->lock, flags);
951 kfree(fid->rdir);
952 kfree(fid);
953 }
954
955 static int p9_client_version(struct p9_client *c)
956 {
957 int err = 0;
958 struct p9_req_t *req;
959 char *version;
960 int msize;
961
962 p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
963 c->msize, c->proto_version);
964
965 switch (c->proto_version) {
966 case p9_proto_2000L:
967 req = p9_client_rpc(c, P9_TVERSION, "ds",
968 c->msize, "9P2000.L");
969 break;
970 case p9_proto_2000u:
971 req = p9_client_rpc(c, P9_TVERSION, "ds",
972 c->msize, "9P2000.u");
973 break;
974 case p9_proto_legacy:
975 req = p9_client_rpc(c, P9_TVERSION, "ds",
976 c->msize, "9P2000");
977 break;
978 default:
979 return -EINVAL;
980 }
981
982 if (IS_ERR(req))
983 return PTR_ERR(req);
984
985 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
986 if (err) {
987 p9_debug(P9_DEBUG_9P, "version error %d\n", err);
988 trace_9p_protocol_dump(c, req->rc);
989 goto error;
990 }
991
992 p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
993 if (!strncmp(version, "9P2000.L", 8))
994 c->proto_version = p9_proto_2000L;
995 else if (!strncmp(version, "9P2000.u", 8))
996 c->proto_version = p9_proto_2000u;
997 else if (!strncmp(version, "9P2000", 6))
998 c->proto_version = p9_proto_legacy;
999 else {
1000 err = -EREMOTEIO;
1001 goto error;
1002 }
1003
1004 if (msize < c->msize)
1005 c->msize = msize;
1006
1007 error:
1008 kfree(version);
1009 p9_free_req(c, req);
1010
1011 return err;
1012 }
1013
1014 struct p9_client *p9_client_create(const char *dev_name, char *options)
1015 {
1016 int err;
1017 struct p9_client *clnt;
1018 char *client_id;
1019
1020 err = 0;
1021 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
1022 if (!clnt)
1023 return ERR_PTR(-ENOMEM);
1024
1025 clnt->trans_mod = NULL;
1026 clnt->trans = NULL;
1027
1028 client_id = utsname()->nodename;
1029 memcpy(clnt->name, client_id, strlen(client_id) + 1);
1030
1031 spin_lock_init(&clnt->lock);
1032 INIT_LIST_HEAD(&clnt->fidlist);
1033
1034 err = p9_tag_init(clnt);
1035 if (err < 0)
1036 goto free_client;
1037
1038 err = parse_opts(options, clnt);
1039 if (err < 0)
1040 goto destroy_tagpool;
1041
1042 if (!clnt->trans_mod)
1043 clnt->trans_mod = v9fs_get_default_trans();
1044
1045 if (clnt->trans_mod == NULL) {
1046 err = -EPROTONOSUPPORT;
1047 p9_debug(P9_DEBUG_ERROR,
1048 "No transport defined or default transport\n");
1049 goto destroy_tagpool;
1050 }
1051
1052 clnt->fidpool = p9_idpool_create();
1053 if (IS_ERR(clnt->fidpool)) {
1054 err = PTR_ERR(clnt->fidpool);
1055 goto put_trans;
1056 }
1057
1058 p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1059 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1060
1061 err = clnt->trans_mod->create(clnt, dev_name, options);
1062 if (err)
1063 goto destroy_fidpool;
1064
1065 if (clnt->msize > clnt->trans_mod->maxsize)
1066 clnt->msize = clnt->trans_mod->maxsize;
1067
1068 err = p9_client_version(clnt);
1069 if (err)
1070 goto close_trans;
1071
1072 return clnt;
1073
1074 close_trans:
1075 clnt->trans_mod->close(clnt);
1076 destroy_fidpool:
1077 p9_idpool_destroy(clnt->fidpool);
1078 put_trans:
1079 v9fs_put_trans(clnt->trans_mod);
1080 destroy_tagpool:
1081 p9_idpool_destroy(clnt->tagpool);
1082 free_client:
1083 kfree(clnt);
1084 return ERR_PTR(err);
1085 }
1086 EXPORT_SYMBOL(p9_client_create);
1087
1088 void p9_client_destroy(struct p9_client *clnt)
1089 {
1090 struct p9_fid *fid, *fidptr;
1091
1092 p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt);
1093
1094 if (clnt->trans_mod)
1095 clnt->trans_mod->close(clnt);
1096
1097 v9fs_put_trans(clnt->trans_mod);
1098
1099 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
1100 pr_info("Found fid %d not clunked\n", fid->fid);
1101 p9_fid_destroy(fid);
1102 }
1103
1104 if (clnt->fidpool)
1105 p9_idpool_destroy(clnt->fidpool);
1106
1107 p9_tag_cleanup(clnt);
1108
1109 kfree(clnt);
1110 }
1111 EXPORT_SYMBOL(p9_client_destroy);
1112
1113 void p9_client_disconnect(struct p9_client *clnt)
1114 {
1115 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1116 clnt->status = Disconnected;
1117 }
1118 EXPORT_SYMBOL(p9_client_disconnect);
1119
1120 void p9_client_begin_disconnect(struct p9_client *clnt)
1121 {
1122 p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt);
1123 clnt->status = BeginDisconnect;
1124 }
1125 EXPORT_SYMBOL(p9_client_begin_disconnect);
1126
1127 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1128 const char *uname, kuid_t n_uname, const char *aname)
1129 {
1130 int err = 0;
1131 struct p9_req_t *req;
1132 struct p9_fid *fid;
1133 struct p9_qid qid;
1134
1135
1136 p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1137 afid ? afid->fid : -1, uname, aname);
1138 fid = p9_fid_create(clnt);
1139 if (IS_ERR(fid)) {
1140 err = PTR_ERR(fid);
1141 fid = NULL;
1142 goto error;
1143 }
1144 fid->uid = n_uname;
1145
1146 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid,
1147 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1148 if (IS_ERR(req)) {
1149 err = PTR_ERR(req);
1150 goto error;
1151 }
1152
1153 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
1154 if (err) {
1155 trace_9p_protocol_dump(clnt, req->rc);
1156 p9_free_req(clnt, req);
1157 goto error;
1158 }
1159
1160 p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1161 qid.type, (unsigned long long)qid.path, qid.version);
1162
1163 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1164
1165 p9_free_req(clnt, req);
1166 return fid;
1167
1168 error:
1169 if (fid)
1170 p9_fid_destroy(fid);
1171 return ERR_PTR(err);
1172 }
1173 EXPORT_SYMBOL(p9_client_attach);
1174
1175 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1176 const unsigned char * const *wnames, int clone)
1177 {
1178 int err;
1179 struct p9_client *clnt;
1180 struct p9_fid *fid;
1181 struct p9_qid *wqids;
1182 struct p9_req_t *req;
1183 uint16_t nwqids, count;
1184
1185 err = 0;
1186 wqids = NULL;
1187 clnt = oldfid->clnt;
1188 if (clone) {
1189 fid = p9_fid_create(clnt);
1190 if (IS_ERR(fid)) {
1191 err = PTR_ERR(fid);
1192 fid = NULL;
1193 goto error;
1194 }
1195
1196 fid->uid = oldfid->uid;
1197 } else
1198 fid = oldfid;
1199
1200
1201 p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1202 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1203
1204 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1205 nwname, wnames);
1206 if (IS_ERR(req)) {
1207 err = PTR_ERR(req);
1208 goto error;
1209 }
1210
1211 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1212 if (err) {
1213 trace_9p_protocol_dump(clnt, req->rc);
1214 p9_free_req(clnt, req);
1215 goto clunk_fid;
1216 }
1217 p9_free_req(clnt, req);
1218
1219 p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1220
1221 if (nwqids != nwname) {
1222 err = -ENOENT;
1223 goto clunk_fid;
1224 }
1225
1226 for (count = 0; count < nwqids; count++)
1227 p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1228 count, wqids[count].type,
1229 (unsigned long long)wqids[count].path,
1230 wqids[count].version);
1231
1232 if (nwname)
1233 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1234 else
1235 fid->qid = oldfid->qid;
1236
1237 kfree(wqids);
1238 return fid;
1239
1240 clunk_fid:
1241 kfree(wqids);
1242 p9_client_clunk(fid);
1243 fid = NULL;
1244
1245 error:
1246 if (fid && (fid != oldfid))
1247 p9_fid_destroy(fid);
1248
1249 return ERR_PTR(err);
1250 }
1251 EXPORT_SYMBOL(p9_client_walk);
1252
1253 int p9_client_open(struct p9_fid *fid, int mode)
1254 {
1255 int err;
1256 struct p9_client *clnt;
1257 struct p9_req_t *req;
1258 struct p9_qid qid;
1259 int iounit;
1260
1261 clnt = fid->clnt;
1262 p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1263 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1264 err = 0;
1265
1266 if (fid->mode != -1)
1267 return -EINVAL;
1268
1269 if (p9_is_proto_dotl(clnt))
1270 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1271 else
1272 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1273 if (IS_ERR(req)) {
1274 err = PTR_ERR(req);
1275 goto error;
1276 }
1277
1278 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1279 if (err) {
1280 trace_9p_protocol_dump(clnt, req->rc);
1281 goto free_and_error;
1282 }
1283
1284 p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1285 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1286 (unsigned long long)qid.path, qid.version, iounit);
1287
1288 fid->mode = mode;
1289 fid->iounit = iounit;
1290
1291 free_and_error:
1292 p9_free_req(clnt, req);
1293 error:
1294 return err;
1295 }
1296 EXPORT_SYMBOL(p9_client_open);
1297
1298 int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode,
1299 kgid_t gid, struct p9_qid *qid)
1300 {
1301 int err = 0;
1302 struct p9_client *clnt;
1303 struct p9_req_t *req;
1304 int iounit;
1305
1306 p9_debug(P9_DEBUG_9P,
1307 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1308 ofid->fid, name, flags, mode,
1309 from_kgid(&init_user_ns, gid));
1310 clnt = ofid->clnt;
1311
1312 if (ofid->mode != -1)
1313 return -EINVAL;
1314
1315 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags,
1316 mode, gid);
1317 if (IS_ERR(req)) {
1318 err = PTR_ERR(req);
1319 goto error;
1320 }
1321
1322 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1323 if (err) {
1324 trace_9p_protocol_dump(clnt, req->rc);
1325 goto free_and_error;
1326 }
1327
1328 p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1329 qid->type,
1330 (unsigned long long)qid->path,
1331 qid->version, iounit);
1332
1333 ofid->mode = mode;
1334 ofid->iounit = iounit;
1335
1336 free_and_error:
1337 p9_free_req(clnt, req);
1338 error:
1339 return err;
1340 }
1341 EXPORT_SYMBOL(p9_client_create_dotl);
1342
1343 int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode,
1344 char *extension)
1345 {
1346 int err;
1347 struct p9_client *clnt;
1348 struct p9_req_t *req;
1349 struct p9_qid qid;
1350 int iounit;
1351
1352 p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1353 fid->fid, name, perm, mode);
1354 err = 0;
1355 clnt = fid->clnt;
1356
1357 if (fid->mode != -1)
1358 return -EINVAL;
1359
1360 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1361 mode, extension);
1362 if (IS_ERR(req)) {
1363 err = PTR_ERR(req);
1364 goto error;
1365 }
1366
1367 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1368 if (err) {
1369 trace_9p_protocol_dump(clnt, req->rc);
1370 goto free_and_error;
1371 }
1372
1373 p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1374 qid.type,
1375 (unsigned long long)qid.path,
1376 qid.version, iounit);
1377
1378 fid->mode = mode;
1379 fid->iounit = iounit;
1380
1381 free_and_error:
1382 p9_free_req(clnt, req);
1383 error:
1384 return err;
1385 }
1386 EXPORT_SYMBOL(p9_client_fcreate);
1387
1388 int p9_client_symlink(struct p9_fid *dfid, const char *name,
1389 const char *symtgt, kgid_t gid, struct p9_qid *qid)
1390 {
1391 int err = 0;
1392 struct p9_client *clnt;
1393 struct p9_req_t *req;
1394
1395 p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1396 dfid->fid, name, symtgt);
1397 clnt = dfid->clnt;
1398
1399 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt,
1400 gid);
1401 if (IS_ERR(req)) {
1402 err = PTR_ERR(req);
1403 goto error;
1404 }
1405
1406 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1407 if (err) {
1408 trace_9p_protocol_dump(clnt, req->rc);
1409 goto free_and_error;
1410 }
1411
1412 p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1413 qid->type, (unsigned long long)qid->path, qid->version);
1414
1415 free_and_error:
1416 p9_free_req(clnt, req);
1417 error:
1418 return err;
1419 }
1420 EXPORT_SYMBOL(p9_client_symlink);
1421
1422 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname)
1423 {
1424 struct p9_client *clnt;
1425 struct p9_req_t *req;
1426
1427 p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1428 dfid->fid, oldfid->fid, newname);
1429 clnt = dfid->clnt;
1430 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1431 newname);
1432 if (IS_ERR(req))
1433 return PTR_ERR(req);
1434
1435 p9_debug(P9_DEBUG_9P, "<<< RLINK\n");
1436 p9_free_req(clnt, req);
1437 return 0;
1438 }
1439 EXPORT_SYMBOL(p9_client_link);
1440
1441 int p9_client_fsync(struct p9_fid *fid, int datasync)
1442 {
1443 int err;
1444 struct p9_client *clnt;
1445 struct p9_req_t *req;
1446
1447 p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1448 fid->fid, datasync);
1449 err = 0;
1450 clnt = fid->clnt;
1451
1452 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1453 if (IS_ERR(req)) {
1454 err = PTR_ERR(req);
1455 goto error;
1456 }
1457
1458 p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1459
1460 p9_free_req(clnt, req);
1461
1462 error:
1463 return err;
1464 }
1465 EXPORT_SYMBOL(p9_client_fsync);
1466
1467 int p9_client_clunk(struct p9_fid *fid)
1468 {
1469 int err;
1470 struct p9_client *clnt;
1471 struct p9_req_t *req;
1472 int retries = 0;
1473
1474 if (!fid) {
1475 pr_warn("%s (%d): Trying to clunk with NULL fid\n",
1476 __func__, task_pid_nr(current));
1477 dump_stack();
1478 return 0;
1479 }
1480
1481 again:
1482 p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid,
1483 retries);
1484 err = 0;
1485 clnt = fid->clnt;
1486
1487 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1488 if (IS_ERR(req)) {
1489 err = PTR_ERR(req);
1490 goto error;
1491 }
1492
1493 p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1494
1495 p9_free_req(clnt, req);
1496 error:
1497 /*
1498 * Fid is not valid even after a failed clunk
1499 * If interrupted, retry once then give up and
1500 * leak fid until umount.
1501 */
1502 if (err == -ERESTARTSYS) {
1503 if (retries++ == 0)
1504 goto again;
1505 } else
1506 p9_fid_destroy(fid);
1507 return err;
1508 }
1509 EXPORT_SYMBOL(p9_client_clunk);
1510
1511 int p9_client_remove(struct p9_fid *fid)
1512 {
1513 int err;
1514 struct p9_client *clnt;
1515 struct p9_req_t *req;
1516
1517 p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1518 err = 0;
1519 clnt = fid->clnt;
1520
1521 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1522 if (IS_ERR(req)) {
1523 err = PTR_ERR(req);
1524 goto error;
1525 }
1526
1527 p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1528
1529 p9_free_req(clnt, req);
1530 error:
1531 if (err == -ERESTARTSYS)
1532 p9_client_clunk(fid);
1533 else
1534 p9_fid_destroy(fid);
1535 return err;
1536 }
1537 EXPORT_SYMBOL(p9_client_remove);
1538
1539 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1540 {
1541 int err = 0;
1542 struct p9_req_t *req;
1543 struct p9_client *clnt;
1544
1545 p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1546 dfid->fid, name, flags);
1547
1548 clnt = dfid->clnt;
1549 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1550 if (IS_ERR(req)) {
1551 err = PTR_ERR(req);
1552 goto error;
1553 }
1554 p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1555
1556 p9_free_req(clnt, req);
1557 error:
1558 return err;
1559 }
1560 EXPORT_SYMBOL(p9_client_unlinkat);
1561
1562 int
1563 p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err)
1564 {
1565 struct p9_client *clnt = fid->clnt;
1566 struct p9_req_t *req;
1567 int total = 0;
1568 *err = 0;
1569
1570 p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1571 fid->fid, (unsigned long long) offset, (int)iov_iter_count(to));
1572
1573 while (iov_iter_count(to)) {
1574 int count = iov_iter_count(to);
1575 int rsize, non_zc = 0;
1576 char *dataptr;
1577
1578 rsize = fid->iounit;
1579 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1580 rsize = clnt->msize - P9_IOHDRSZ;
1581
1582 if (count < rsize)
1583 rsize = count;
1584
1585 /* Don't bother zerocopy for small IO (< 1024) */
1586 if (clnt->trans_mod->zc_request && rsize > 1024) {
1587 /*
1588 * response header len is 11
1589 * PDU Header(7) + IO Size (4)
1590 */
1591 req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize,
1592 0, 11, "dqd", fid->fid,
1593 offset, rsize);
1594 } else {
1595 non_zc = 1;
1596 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1597 rsize);
1598 }
1599 if (IS_ERR(req)) {
1600 *err = PTR_ERR(req);
1601 break;
1602 }
1603
1604 *err = p9pdu_readf(req->rc, clnt->proto_version,
1605 "D", &count, &dataptr);
1606 if (*err) {
1607 trace_9p_protocol_dump(clnt, req->rc);
1608 p9_free_req(clnt, req);
1609 break;
1610 }
1611 if (rsize < count) {
1612 pr_err("bogus RREAD count (%d > %d)\n", count, rsize);
1613 count = rsize;
1614 }
1615
1616 p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1617 if (!count) {
1618 p9_free_req(clnt, req);
1619 break;
1620 }
1621
1622 if (non_zc) {
1623 int n = copy_to_iter(dataptr, count, to);
1624 total += n;
1625 offset += n;
1626 if (n != count) {
1627 *err = -EFAULT;
1628 p9_free_req(clnt, req);
1629 break;
1630 }
1631 } else {
1632 iov_iter_advance(to, count);
1633 total += count;
1634 offset += count;
1635 }
1636 p9_free_req(clnt, req);
1637 }
1638 return total;
1639 }
1640 EXPORT_SYMBOL(p9_client_read);
1641
1642 int
1643 p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
1644 {
1645 struct p9_client *clnt = fid->clnt;
1646 struct p9_req_t *req;
1647 int total = 0;
1648 *err = 0;
1649
1650 p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n",
1651 fid->fid, (unsigned long long) offset,
1652 iov_iter_count(from));
1653
1654 while (iov_iter_count(from)) {
1655 int count = iov_iter_count(from);
1656 int rsize = fid->iounit;
1657 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1658 rsize = clnt->msize - P9_IOHDRSZ;
1659
1660 if (count < rsize)
1661 rsize = count;
1662
1663 /* Don't bother zerocopy for small IO (< 1024) */
1664 if (clnt->trans_mod->zc_request && rsize > 1024) {
1665 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0,
1666 rsize, P9_ZC_HDR_SZ, "dqd",
1667 fid->fid, offset, rsize);
1668 } else {
1669 req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid,
1670 offset, rsize, from);
1671 }
1672 if (IS_ERR(req)) {
1673 *err = PTR_ERR(req);
1674 break;
1675 }
1676
1677 *err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1678 if (*err) {
1679 trace_9p_protocol_dump(clnt, req->rc);
1680 p9_free_req(clnt, req);
1681 break;
1682 }
1683 if (rsize < count) {
1684 pr_err("bogus RWRITE count (%d > %d)\n", count, rsize);
1685 count = rsize;
1686 }
1687
1688 p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1689
1690 p9_free_req(clnt, req);
1691 iov_iter_advance(from, count);
1692 total += count;
1693 offset += count;
1694 }
1695 return total;
1696 }
1697 EXPORT_SYMBOL(p9_client_write);
1698
1699 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1700 {
1701 int err;
1702 struct p9_client *clnt;
1703 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1704 struct p9_req_t *req;
1705 u16 ignored;
1706
1707 p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1708
1709 if (!ret)
1710 return ERR_PTR(-ENOMEM);
1711
1712 err = 0;
1713 clnt = fid->clnt;
1714
1715 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1716 if (IS_ERR(req)) {
1717 err = PTR_ERR(req);
1718 goto error;
1719 }
1720
1721 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1722 if (err) {
1723 trace_9p_protocol_dump(clnt, req->rc);
1724 p9_free_req(clnt, req);
1725 goto error;
1726 }
1727
1728 p9_debug(P9_DEBUG_9P,
1729 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1730 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1731 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1732 "<<< uid=%d gid=%d n_muid=%d\n",
1733 ret->size, ret->type, ret->dev, ret->qid.type,
1734 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1735 ret->atime, ret->mtime, (unsigned long long)ret->length,
1736 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1737 from_kuid(&init_user_ns, ret->n_uid),
1738 from_kgid(&init_user_ns, ret->n_gid),
1739 from_kuid(&init_user_ns, ret->n_muid));
1740
1741 p9_free_req(clnt, req);
1742 return ret;
1743
1744 error:
1745 kfree(ret);
1746 return ERR_PTR(err);
1747 }
1748 EXPORT_SYMBOL(p9_client_stat);
1749
1750 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1751 u64 request_mask)
1752 {
1753 int err;
1754 struct p9_client *clnt;
1755 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1756 GFP_KERNEL);
1757 struct p9_req_t *req;
1758
1759 p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1760 fid->fid, request_mask);
1761
1762 if (!ret)
1763 return ERR_PTR(-ENOMEM);
1764
1765 err = 0;
1766 clnt = fid->clnt;
1767
1768 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1769 if (IS_ERR(req)) {
1770 err = PTR_ERR(req);
1771 goto error;
1772 }
1773
1774 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1775 if (err) {
1776 trace_9p_protocol_dump(clnt, req->rc);
1777 p9_free_req(clnt, req);
1778 goto error;
1779 }
1780
1781 p9_debug(P9_DEBUG_9P,
1782 "<<< RGETATTR st_result_mask=%lld\n"
1783 "<<< qid=%x.%llx.%x\n"
1784 "<<< st_mode=%8.8x st_nlink=%llu\n"
1785 "<<< st_uid=%d st_gid=%d\n"
1786 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1787 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1788 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1789 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1790 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1791 "<<< st_gen=%lld st_data_version=%lld",
1792 ret->st_result_mask, ret->qid.type, ret->qid.path,
1793 ret->qid.version, ret->st_mode, ret->st_nlink,
1794 from_kuid(&init_user_ns, ret->st_uid),
1795 from_kgid(&init_user_ns, ret->st_gid),
1796 ret->st_rdev, ret->st_size, ret->st_blksize,
1797 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1798 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1799 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1800 ret->st_gen, ret->st_data_version);
1801
1802 p9_free_req(clnt, req);
1803 return ret;
1804
1805 error:
1806 kfree(ret);
1807 return ERR_PTR(err);
1808 }
1809 EXPORT_SYMBOL(p9_client_getattr_dotl);
1810
1811 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1812 {
1813 int ret;
1814
1815 /* NOTE: size shouldn't include its own length */
1816 /* size[2] type[2] dev[4] qid[13] */
1817 /* mode[4] atime[4] mtime[4] length[8]*/
1818 /* name[s] uid[s] gid[s] muid[s] */
1819 ret = 2+4+13+4+4+4+8+2+2+2+2;
1820
1821 if (wst->name)
1822 ret += strlen(wst->name);
1823 if (wst->uid)
1824 ret += strlen(wst->uid);
1825 if (wst->gid)
1826 ret += strlen(wst->gid);
1827 if (wst->muid)
1828 ret += strlen(wst->muid);
1829
1830 if ((proto_version == p9_proto_2000u) ||
1831 (proto_version == p9_proto_2000L)) {
1832 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1833 if (wst->extension)
1834 ret += strlen(wst->extension);
1835 }
1836
1837 return ret;
1838 }
1839
1840 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1841 {
1842 int err;
1843 struct p9_req_t *req;
1844 struct p9_client *clnt;
1845
1846 err = 0;
1847 clnt = fid->clnt;
1848 wst->size = p9_client_statsize(wst, clnt->proto_version);
1849 p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1850 p9_debug(P9_DEBUG_9P,
1851 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1852 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1853 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1854 " uid=%d gid=%d n_muid=%d\n",
1855 wst->size, wst->type, wst->dev, wst->qid.type,
1856 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1857 wst->atime, wst->mtime, (unsigned long long)wst->length,
1858 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1859 from_kuid(&init_user_ns, wst->n_uid),
1860 from_kgid(&init_user_ns, wst->n_gid),
1861 from_kuid(&init_user_ns, wst->n_muid));
1862
1863 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1864 if (IS_ERR(req)) {
1865 err = PTR_ERR(req);
1866 goto error;
1867 }
1868
1869 p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1870
1871 p9_free_req(clnt, req);
1872 error:
1873 return err;
1874 }
1875 EXPORT_SYMBOL(p9_client_wstat);
1876
1877 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1878 {
1879 int err;
1880 struct p9_req_t *req;
1881 struct p9_client *clnt;
1882
1883 err = 0;
1884 clnt = fid->clnt;
1885 p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1886 p9_debug(P9_DEBUG_9P,
1887 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1888 " atime_sec=%lld atime_nsec=%lld\n"
1889 " mtime_sec=%lld mtime_nsec=%lld\n",
1890 p9attr->valid, p9attr->mode,
1891 from_kuid(&init_user_ns, p9attr->uid),
1892 from_kgid(&init_user_ns, p9attr->gid),
1893 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1894 p9attr->mtime_sec, p9attr->mtime_nsec);
1895
1896 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1897
1898 if (IS_ERR(req)) {
1899 err = PTR_ERR(req);
1900 goto error;
1901 }
1902 p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1903 p9_free_req(clnt, req);
1904 error:
1905 return err;
1906 }
1907 EXPORT_SYMBOL(p9_client_setattr);
1908
1909 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1910 {
1911 int err;
1912 struct p9_req_t *req;
1913 struct p9_client *clnt;
1914
1915 err = 0;
1916 clnt = fid->clnt;
1917
1918 p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1919
1920 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1921 if (IS_ERR(req)) {
1922 err = PTR_ERR(req);
1923 goto error;
1924 }
1925
1926 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1927 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1928 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1929 if (err) {
1930 trace_9p_protocol_dump(clnt, req->rc);
1931 p9_free_req(clnt, req);
1932 goto error;
1933 }
1934
1935 p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1936 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1937 "fsid %llu namelen %ld\n",
1938 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1939 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1940 sb->fsid, (long int)sb->namelen);
1941
1942 p9_free_req(clnt, req);
1943 error:
1944 return err;
1945 }
1946 EXPORT_SYMBOL(p9_client_statfs);
1947
1948 int p9_client_rename(struct p9_fid *fid,
1949 struct p9_fid *newdirfid, const char *name)
1950 {
1951 int err;
1952 struct p9_req_t *req;
1953 struct p9_client *clnt;
1954
1955 err = 0;
1956 clnt = fid->clnt;
1957
1958 p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1959 fid->fid, newdirfid->fid, name);
1960
1961 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1962 newdirfid->fid, name);
1963 if (IS_ERR(req)) {
1964 err = PTR_ERR(req);
1965 goto error;
1966 }
1967
1968 p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1969
1970 p9_free_req(clnt, req);
1971 error:
1972 return err;
1973 }
1974 EXPORT_SYMBOL(p9_client_rename);
1975
1976 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1977 struct p9_fid *newdirfid, const char *new_name)
1978 {
1979 int err;
1980 struct p9_req_t *req;
1981 struct p9_client *clnt;
1982
1983 err = 0;
1984 clnt = olddirfid->clnt;
1985
1986 p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1987 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1988 newdirfid->fid, new_name);
1989
1990 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1991 old_name, newdirfid->fid, new_name);
1992 if (IS_ERR(req)) {
1993 err = PTR_ERR(req);
1994 goto error;
1995 }
1996
1997 p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1998 newdirfid->fid, new_name);
1999
2000 p9_free_req(clnt, req);
2001 error:
2002 return err;
2003 }
2004 EXPORT_SYMBOL(p9_client_renameat);
2005
2006 /*
2007 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
2008 */
2009 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
2010 const char *attr_name, u64 *attr_size)
2011 {
2012 int err;
2013 struct p9_req_t *req;
2014 struct p9_client *clnt;
2015 struct p9_fid *attr_fid;
2016
2017 err = 0;
2018 clnt = file_fid->clnt;
2019 attr_fid = p9_fid_create(clnt);
2020 if (IS_ERR(attr_fid)) {
2021 err = PTR_ERR(attr_fid);
2022 attr_fid = NULL;
2023 goto error;
2024 }
2025 p9_debug(P9_DEBUG_9P,
2026 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
2027 file_fid->fid, attr_fid->fid, attr_name);
2028
2029 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
2030 file_fid->fid, attr_fid->fid, attr_name);
2031 if (IS_ERR(req)) {
2032 err = PTR_ERR(req);
2033 goto error;
2034 }
2035 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
2036 if (err) {
2037 trace_9p_protocol_dump(clnt, req->rc);
2038 p9_free_req(clnt, req);
2039 goto clunk_fid;
2040 }
2041 p9_free_req(clnt, req);
2042 p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
2043 attr_fid->fid, *attr_size);
2044 return attr_fid;
2045 clunk_fid:
2046 p9_client_clunk(attr_fid);
2047 attr_fid = NULL;
2048 error:
2049 if (attr_fid && (attr_fid != file_fid))
2050 p9_fid_destroy(attr_fid);
2051
2052 return ERR_PTR(err);
2053 }
2054 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
2055
2056 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
2057 u64 attr_size, int flags)
2058 {
2059 int err;
2060 struct p9_req_t *req;
2061 struct p9_client *clnt;
2062
2063 p9_debug(P9_DEBUG_9P,
2064 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
2065 fid->fid, name, (long long)attr_size, flags);
2066 err = 0;
2067 clnt = fid->clnt;
2068 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
2069 fid->fid, name, attr_size, flags);
2070 if (IS_ERR(req)) {
2071 err = PTR_ERR(req);
2072 goto error;
2073 }
2074 p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2075 p9_free_req(clnt, req);
2076 error:
2077 return err;
2078 }
2079 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2080
2081 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2082 {
2083 int err, rsize, non_zc = 0;
2084 struct p9_client *clnt;
2085 struct p9_req_t *req;
2086 char *dataptr;
2087 struct kvec kv = {.iov_base = data, .iov_len = count};
2088 struct iov_iter to;
2089
2090 iov_iter_kvec(&to, READ | ITER_KVEC, &kv, 1, count);
2091
2092 p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2093 fid->fid, (unsigned long long) offset, count);
2094
2095 err = 0;
2096 clnt = fid->clnt;
2097
2098 rsize = fid->iounit;
2099 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2100 rsize = clnt->msize - P9_READDIRHDRSZ;
2101
2102 if (count < rsize)
2103 rsize = count;
2104
2105 /* Don't bother zerocopy for small IO (< 1024) */
2106 if (clnt->trans_mod->zc_request && rsize > 1024) {
2107 /*
2108 * response header len is 11
2109 * PDU Header(7) + IO Size (4)
2110 */
2111 req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0,
2112 11, "dqd", fid->fid, offset, rsize);
2113 } else {
2114 non_zc = 1;
2115 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2116 offset, rsize);
2117 }
2118 if (IS_ERR(req)) {
2119 err = PTR_ERR(req);
2120 goto error;
2121 }
2122
2123 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2124 if (err) {
2125 trace_9p_protocol_dump(clnt, req->rc);
2126 goto free_and_error;
2127 }
2128 if (rsize < count) {
2129 pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize);
2130 count = rsize;
2131 }
2132
2133 p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2134
2135 if (non_zc)
2136 memmove(data, dataptr, count);
2137
2138 p9_free_req(clnt, req);
2139 return count;
2140
2141 free_and_error:
2142 p9_free_req(clnt, req);
2143 error:
2144 return err;
2145 }
2146 EXPORT_SYMBOL(p9_client_readdir);
2147
2148 int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode,
2149 dev_t rdev, kgid_t gid, struct p9_qid *qid)
2150 {
2151 int err;
2152 struct p9_client *clnt;
2153 struct p9_req_t *req;
2154
2155 err = 0;
2156 clnt = fid->clnt;
2157 p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2158 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2159 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode,
2160 MAJOR(rdev), MINOR(rdev), gid);
2161 if (IS_ERR(req))
2162 return PTR_ERR(req);
2163
2164 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2165 if (err) {
2166 trace_9p_protocol_dump(clnt, req->rc);
2167 goto error;
2168 }
2169 p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2170 (unsigned long long)qid->path, qid->version);
2171
2172 error:
2173 p9_free_req(clnt, req);
2174 return err;
2175
2176 }
2177 EXPORT_SYMBOL(p9_client_mknod_dotl);
2178
2179 int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode,
2180 kgid_t gid, struct p9_qid *qid)
2181 {
2182 int err;
2183 struct p9_client *clnt;
2184 struct p9_req_t *req;
2185
2186 err = 0;
2187 clnt = fid->clnt;
2188 p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2189 fid->fid, name, mode, from_kgid(&init_user_ns, gid));
2190 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode,
2191 gid);
2192 if (IS_ERR(req))
2193 return PTR_ERR(req);
2194
2195 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2196 if (err) {
2197 trace_9p_protocol_dump(clnt, req->rc);
2198 goto error;
2199 }
2200 p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2201 (unsigned long long)qid->path, qid->version);
2202
2203 error:
2204 p9_free_req(clnt, req);
2205 return err;
2206
2207 }
2208 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2209
2210 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2211 {
2212 int err;
2213 struct p9_client *clnt;
2214 struct p9_req_t *req;
2215
2216 err = 0;
2217 clnt = fid->clnt;
2218 p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2219 "start %lld length %lld proc_id %d client_id %s\n",
2220 fid->fid, flock->type, flock->flags, flock->start,
2221 flock->length, flock->proc_id, flock->client_id);
2222
2223 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2224 flock->flags, flock->start, flock->length,
2225 flock->proc_id, flock->client_id);
2226
2227 if (IS_ERR(req))
2228 return PTR_ERR(req);
2229
2230 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2231 if (err) {
2232 trace_9p_protocol_dump(clnt, req->rc);
2233 goto error;
2234 }
2235 p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2236 error:
2237 p9_free_req(clnt, req);
2238 return err;
2239
2240 }
2241 EXPORT_SYMBOL(p9_client_lock_dotl);
2242
2243 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2244 {
2245 int err;
2246 struct p9_client *clnt;
2247 struct p9_req_t *req;
2248
2249 err = 0;
2250 clnt = fid->clnt;
2251 p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2252 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2253 glock->start, glock->length, glock->proc_id, glock->client_id);
2254
2255 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2256 glock->start, glock->length, glock->proc_id, glock->client_id);
2257
2258 if (IS_ERR(req))
2259 return PTR_ERR(req);
2260
2261 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2262 &glock->start, &glock->length, &glock->proc_id,
2263 &glock->client_id);
2264 if (err) {
2265 trace_9p_protocol_dump(clnt, req->rc);
2266 goto error;
2267 }
2268 p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2269 "proc_id %d client_id %s\n", glock->type, glock->start,
2270 glock->length, glock->proc_id, glock->client_id);
2271 error:
2272 p9_free_req(clnt, req);
2273 return err;
2274 }
2275 EXPORT_SYMBOL(p9_client_getlock_dotl);
2276
2277 int p9_client_readlink(struct p9_fid *fid, char **target)
2278 {
2279 int err;
2280 struct p9_client *clnt;
2281 struct p9_req_t *req;
2282
2283 err = 0;
2284 clnt = fid->clnt;
2285 p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2286
2287 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2288 if (IS_ERR(req))
2289 return PTR_ERR(req);
2290
2291 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2292 if (err) {
2293 trace_9p_protocol_dump(clnt, req->rc);
2294 goto error;
2295 }
2296 p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2297 error:
2298 p9_free_req(clnt, req);
2299 return err;
2300 }
2301 EXPORT_SYMBOL(p9_client_readlink);
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