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9p: move dereference after NULL check
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / 9p / client.c
blob9eadadb0a6987de0ff54840fce2153a5ad65c7a5
1 /*
2 * net/9p/clnt.c
3 *
4 * 9P Client
5 *
6 * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to:
20 * Free Software Foundation
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02111-1301 USA
23 *
24 */
25
26 #include <linux/module.h>
27 #include <linux/errno.h>
28 #include <linux/fs.h>
29 #include <linux/poll.h>
30 #include <linux/idr.h>
31 #include <linux/mutex.h>
32 #include <linux/slab.h>
33 #include <linux/sched.h>
34 #include <linux/uaccess.h>
35 #include <net/9p/9p.h>
36 #include <linux/parser.h>
37 #include <net/9p/client.h>
38 #include <net/9p/transport.h>
39 #include "protocol.h"
40
41 /*
42 * Client Option Parsing (code inspired by NFS code)
43 * - a little lazy - parse all client options
44 */
45
46 enum {
47 Opt_msize,
48 Opt_trans,
49 Opt_legacy,
50 Opt_version,
51 Opt_err,
52 };
53
54 static const match_table_t tokens = {
55 {Opt_msize, "msize=%u"},
56 {Opt_legacy, "noextend"},
57 {Opt_trans, "trans=%s"},
58 {Opt_version, "version=%s"},
59 {Opt_err, NULL},
60 };
61
62 inline int p9_is_proto_dotl(struct p9_client *clnt)
63 {
64 return clnt->proto_version == p9_proto_2000L;
65 }
66 EXPORT_SYMBOL(p9_is_proto_dotl);
67
68 inline int p9_is_proto_dotu(struct p9_client *clnt)
69 {
70 return clnt->proto_version == p9_proto_2000u;
71 }
72 EXPORT_SYMBOL(p9_is_proto_dotu);
73
74 /* Interpret mount option for protocol version */
75 static int get_protocol_version(char *s)
76 {
77 int version = -EINVAL;
78
79 if (!strcmp(s, "9p2000")) {
80 version = p9_proto_legacy;
81 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: Legacy\n");
82 } else if (!strcmp(s, "9p2000.u")) {
83 version = p9_proto_2000u;
84 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
85 } else if (!strcmp(s, "9p2000.L")) {
86 version = p9_proto_2000L;
87 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
88 } else
89 printk(KERN_INFO "9p: Unknown protocol version %s.\n", s);
90
91 return version;
92 }
93
94 /**
95 * parse_options - parse mount options into client structure
96 * @opts: options string passed from mount
97 * @clnt: existing v9fs client information
98 *
99 * Return 0 upon success, -ERRNO upon failure
100 */
101
102 static int parse_opts(char *opts, struct p9_client *clnt)
103 {
104 char *options, *tmp_options;
105 char *p;
106 substring_t args[MAX_OPT_ARGS];
107 int option;
108 char *s;
109 int ret = 0;
110
111 clnt->proto_version = p9_proto_2000u;
112 clnt->msize = 8192;
113
114 if (!opts)
115 return 0;
116
117 tmp_options = kstrdup(opts, GFP_KERNEL);
118 if (!tmp_options) {
119 P9_DPRINTK(P9_DEBUG_ERROR,
120 "failed to allocate copy of option string\n");
121 return -ENOMEM;
122 }
123 options = tmp_options;
124
125 while ((p = strsep(&options, ",")) != NULL) {
126 int token;
127 if (!*p)
128 continue;
129 token = match_token(p, tokens, args);
130 if (token < Opt_trans) {
131 int r = match_int(&args[0], &option);
132 if (r < 0) {
133 P9_DPRINTK(P9_DEBUG_ERROR,
134 "integer field, but no integer?\n");
135 ret = r;
136 continue;
137 }
138 }
139 switch (token) {
140 case Opt_msize:
141 clnt->msize = option;
142 break;
143 case Opt_trans:
144 s = match_strdup(&args[0]);
145 if (!s) {
146 ret = -ENOMEM;
147 P9_DPRINTK(P9_DEBUG_ERROR,
148 "problem allocating copy of trans arg\n");
149 goto free_and_return;
150 }
151 clnt->trans_mod = v9fs_get_trans_by_name(s);
152 if (clnt->trans_mod == NULL) {
153 printk(KERN_INFO
154 "9p: Could not find "
155 "request transport: %s\n", s);
156 ret = -EINVAL;
157 kfree(s);
158 goto free_and_return;
159 }
160 kfree(s);
161 break;
162 case Opt_legacy:
163 clnt->proto_version = p9_proto_legacy;
164 break;
165 case Opt_version:
166 s = match_strdup(&args[0]);
167 if (!s) {
168 ret = -ENOMEM;
169 P9_DPRINTK(P9_DEBUG_ERROR,
170 "problem allocating copy of version arg\n");
171 goto free_and_return;
172 }
173 ret = get_protocol_version(s);
174 if (ret == -EINVAL) {
175 kfree(s);
176 goto free_and_return;
177 }
178 kfree(s);
179 clnt->proto_version = ret;
180 break;
181 default:
182 continue;
183 }
184 }
185
186 free_and_return:
187 kfree(tmp_options);
188 return ret;
189 }
190
191 /**
192 * p9_tag_alloc - lookup/allocate a request by tag
193 * @c: client session to lookup tag within
194 * @tag: numeric id for transaction
195 *
196 * this is a simple array lookup, but will grow the
197 * request_slots as necessary to accommodate transaction
198 * ids which did not previously have a slot.
199 *
200 * this code relies on the client spinlock to manage locks, its
201 * possible we should switch to something else, but I'd rather
202 * stick with something low-overhead for the common case.
203 *
204 */
205
206 static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag, int max_size)
207 {
208 unsigned long flags;
209 int row, col;
210 struct p9_req_t *req;
211 int alloc_msize = min(c->msize, max_size);
212
213 /* This looks up the original request by tag so we know which
214 * buffer to read the data into */
215 tag++;
216
217 if (tag >= c->max_tag) {
218 spin_lock_irqsave(&c->lock, flags);
219 /* check again since original check was outside of lock */
220 while (tag >= c->max_tag) {
221 row = (tag / P9_ROW_MAXTAG);
222 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
223 sizeof(struct p9_req_t), GFP_ATOMIC);
224
225 if (!c->reqs[row]) {
226 printk(KERN_ERR "Couldn't grow tag array\n");
227 spin_unlock_irqrestore(&c->lock, flags);
228 return ERR_PTR(-ENOMEM);
229 }
230 for (col = 0; col < P9_ROW_MAXTAG; col++) {
231 c->reqs[row][col].status = REQ_STATUS_IDLE;
232 c->reqs[row][col].tc = NULL;
233 }
234 c->max_tag += P9_ROW_MAXTAG;
235 }
236 spin_unlock_irqrestore(&c->lock, flags);
237 }
238 row = tag / P9_ROW_MAXTAG;
239 col = tag % P9_ROW_MAXTAG;
240
241 req = &c->reqs[row][col];
242 if (!req->tc) {
243 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
244 if (!req->wq) {
245 printk(KERN_ERR "Couldn't grow tag array\n");
246 return ERR_PTR(-ENOMEM);
247 }
248 init_waitqueue_head(req->wq);
249 req->tc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
250 GFP_NOFS);
251 req->rc = kmalloc(sizeof(struct p9_fcall) + alloc_msize,
252 GFP_NOFS);
253 if ((!req->tc) || (!req->rc)) {
254 printk(KERN_ERR "Couldn't grow tag array\n");
255 kfree(req->tc);
256 kfree(req->rc);
257 kfree(req->wq);
258 req->tc = req->rc = NULL;
259 req->wq = NULL;
260 return ERR_PTR(-ENOMEM);
261 }
262 req->tc->capacity = alloc_msize;
263 req->rc->capacity = alloc_msize;
264 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
265 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
266 }
267
268 p9pdu_reset(req->tc);
269 p9pdu_reset(req->rc);
270
271 req->tc->tag = tag-1;
272 req->status = REQ_STATUS_ALLOC;
273
274 return &c->reqs[row][col];
275 }
276
277 /**
278 * p9_tag_lookup - lookup a request by tag
279 * @c: client session to lookup tag within
280 * @tag: numeric id for transaction
281 *
282 */
283
284 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
285 {
286 int row, col;
287
288 /* This looks up the original request by tag so we know which
289 * buffer to read the data into */
290 tag++;
291
292 if(tag >= c->max_tag)
293 return NULL;
294
295 row = tag / P9_ROW_MAXTAG;
296 col = tag % P9_ROW_MAXTAG;
297
298 return &c->reqs[row][col];
299 }
300 EXPORT_SYMBOL(p9_tag_lookup);
301
302 /**
303 * p9_tag_init - setup tags structure and contents
304 * @c: v9fs client struct
305 *
306 * This initializes the tags structure for each client instance.
307 *
308 */
309
310 static int p9_tag_init(struct p9_client *c)
311 {
312 int err = 0;
313
314 c->tagpool = p9_idpool_create();
315 if (IS_ERR(c->tagpool)) {
316 err = PTR_ERR(c->tagpool);
317 goto error;
318 }
319 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
320 if (err < 0) {
321 p9_idpool_destroy(c->tagpool);
322 goto error;
323 }
324 c->max_tag = 0;
325 error:
326 return err;
327 }
328
329 /**
330 * p9_tag_cleanup - cleans up tags structure and reclaims resources
331 * @c: v9fs client struct
332 *
333 * This frees resources associated with the tags structure
334 *
335 */
336 static void p9_tag_cleanup(struct p9_client *c)
337 {
338 int row, col;
339
340 /* check to insure all requests are idle */
341 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
342 for (col = 0; col < P9_ROW_MAXTAG; col++) {
343 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
344 P9_DPRINTK(P9_DEBUG_MUX,
345 "Attempting to cleanup non-free tag %d,%d\n",
346 row, col);
347 /* TODO: delay execution of cleanup */
348 return;
349 }
350 }
351 }
352
353 if (c->tagpool) {
354 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
355 p9_idpool_destroy(c->tagpool);
356 }
357
358 /* free requests associated with tags */
359 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
360 for (col = 0; col < P9_ROW_MAXTAG; col++) {
361 kfree(c->reqs[row][col].wq);
362 kfree(c->reqs[row][col].tc);
363 kfree(c->reqs[row][col].rc);
364 }
365 kfree(c->reqs[row]);
366 }
367 c->max_tag = 0;
368 }
369
370 /**
371 * p9_free_req - free a request and clean-up as necessary
372 * c: client state
373 * r: request to release
374 *
375 */
376
377 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
378 {
379 int tag = r->tc->tag;
380 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
381
382 r->status = REQ_STATUS_IDLE;
383 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
384 p9_idpool_put(tag, c->tagpool);
385 }
386
387 /**
388 * p9_client_cb - call back from transport to client
389 * c: client state
390 * req: request received
391 *
392 */
393 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
394 {
395 P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
396 wake_up(req->wq);
397 P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
398 }
399 EXPORT_SYMBOL(p9_client_cb);
400
401 /**
402 * p9_parse_header - parse header arguments out of a packet
403 * @pdu: packet to parse
404 * @size: size of packet
405 * @type: type of request
406 * @tag: tag of packet
407 * @rewind: set if we need to rewind offset afterwards
408 */
409
410 int
411 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
412 int rewind)
413 {
414 int8_t r_type;
415 int16_t r_tag;
416 int32_t r_size;
417 int offset = pdu->offset;
418 int err;
419
420 pdu->offset = 0;
421 if (pdu->size == 0)
422 pdu->size = 7;
423
424 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
425 if (err)
426 goto rewind_and_exit;
427
428 pdu->size = r_size;
429 pdu->id = r_type;
430 pdu->tag = r_tag;
431
432 P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size,
433 pdu->id, pdu->tag);
434
435 if (type)
436 *type = r_type;
437 if (tag)
438 *tag = r_tag;
439 if (size)
440 *size = r_size;
441
442
443 rewind_and_exit:
444 if (rewind)
445 pdu->offset = offset;
446 return err;
447 }
448 EXPORT_SYMBOL(p9_parse_header);
449
450 /**
451 * p9_check_errors - check 9p packet for error return and process it
452 * @c: current client instance
453 * @req: request to parse and check for error conditions
454 *
455 * returns error code if one is discovered, otherwise returns 0
456 *
457 * this will have to be more complicated if we have multiple
458 * error packet types
459 */
460
461 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
462 {
463 int8_t type;
464 int err;
465 int ecode;
466
467 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
468 if (err) {
469 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
470 return err;
471 }
472
473 if (type != P9_RERROR && type != P9_RLERROR)
474 return 0;
475
476 if (!p9_is_proto_dotl(c)) {
477 char *ename;
478 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
479 &ename, &ecode);
480 if (err)
481 goto out_err;
482
483 if (p9_is_proto_dotu(c))
484 err = -ecode;
485
486 if (!err || !IS_ERR_VALUE(err)) {
487 err = p9_errstr2errno(ename, strlen(ename));
488
489 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
490 -ecode, ename);
491 }
492 kfree(ename);
493 } else {
494 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
495 err = -ecode;
496
497 P9_DPRINTK(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
498 }
499
500 return err;
501
502 out_err:
503 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
504
505 return err;
506 }
507
508 /**
509 * p9_check_zc_errors - check 9p packet for error return and process it
510 * @c: current client instance
511 * @req: request to parse and check for error conditions
512 * @in_hdrlen: Size of response protocol buffer.
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_zc_errors(struct p9_client *c, struct p9_req_t *req,
521 char *uidata, int in_hdrlen, int kern_buf)
522 {
523 int err;
524 int ecode;
525 int8_t type;
526 char *ename = NULL;
527
528 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
529 if (err) {
530 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
531 return err;
532 }
533
534 if (type != P9_RERROR && type != P9_RLERROR)
535 return 0;
536
537 if (!p9_is_proto_dotl(c)) {
538 /* Error is reported in string format */
539 uint16_t len;
540 /* 7 = header size for RERROR, 2 is the size of string len; */
541 int inline_len = in_hdrlen - (7 + 2);
542
543 /* Read the size of error string */
544 err = p9pdu_readf(req->rc, c->proto_version, "w", &len);
545 if (err)
546 goto out_err;
547
548 ename = kmalloc(len + 1, GFP_NOFS);
549 if (!ename) {
550 err = -ENOMEM;
551 goto out_err;
552 }
553 if (len <= inline_len) {
554 /* We have error in protocol buffer itself */
555 if (pdu_read(req->rc, ename, len)) {
556 err = -EFAULT;
557 goto out_free;
558
559 }
560 } else {
561 /*
562 * Part of the data is in user space buffer.
563 */
564 if (pdu_read(req->rc, ename, inline_len)) {
565 err = -EFAULT;
566 goto out_free;
567
568 }
569 if (kern_buf) {
570 memcpy(ename + inline_len, uidata,
571 len - inline_len);
572 } else {
573 err = copy_from_user(ename + inline_len,
574 uidata, len - inline_len);
575 if (err) {
576 err = -EFAULT;
577 goto out_free;
578 }
579 }
580 }
581 ename[len] = 0;
582 if (p9_is_proto_dotu(c)) {
583 /* For dotu we also have error code */
584 err = p9pdu_readf(req->rc,
585 c->proto_version, "d", &ecode);
586 if (err)
587 goto out_free;
588 err = -ecode;
589 }
590 if (!err || !IS_ERR_VALUE(err)) {
591 err = p9_errstr2errno(ename, strlen(ename));
592
593 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n",
594 -ecode, ename);
595 }
596 kfree(ename);
597 } else {
598 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
599 err = -ecode;
600
601 P9_DPRINTK(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
602 }
603 return err;
604
605 out_free:
606 kfree(ename);
607 out_err:
608 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
609 return err;
610 }
611
612 static struct p9_req_t *
613 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
614
615 /**
616 * p9_client_flush - flush (cancel) a request
617 * @c: client state
618 * @oldreq: request to cancel
619 *
620 * This sents a flush for a particular request and links
621 * the flush request to the original request. The current
622 * code only supports a single flush request although the protocol
623 * allows for multiple flush requests to be sent for a single request.
624 *
625 */
626
627 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
628 {
629 struct p9_req_t *req;
630 int16_t oldtag;
631 int err;
632
633 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
634 if (err)
635 return err;
636
637 P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
638
639 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
640 if (IS_ERR(req))
641 return PTR_ERR(req);
642
643
644 /* if we haven't received a response for oldreq,
645 remove it from the list. */
646 spin_lock(&c->lock);
647 if (oldreq->status == REQ_STATUS_FLSH)
648 list_del(&oldreq->req_list);
649 spin_unlock(&c->lock);
650
651 p9_free_req(c, req);
652 return 0;
653 }
654
655 static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
656 int8_t type, int req_size,
657 const char *fmt, va_list ap)
658 {
659 int tag, err;
660 struct p9_req_t *req;
661
662 P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
663
664 /* we allow for any status other than disconnected */
665 if (c->status == Disconnected)
666 return ERR_PTR(-EIO);
667
668 /* if status is begin_disconnected we allow only clunk request */
669 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
670 return ERR_PTR(-EIO);
671
672 tag = P9_NOTAG;
673 if (type != P9_TVERSION) {
674 tag = p9_idpool_get(c->tagpool);
675 if (tag < 0)
676 return ERR_PTR(-ENOMEM);
677 }
678
679 req = p9_tag_alloc(c, tag, req_size);
680 if (IS_ERR(req))
681 return req;
682
683 /* marshall the data */
684 p9pdu_prepare(req->tc, tag, type);
685 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
686 if (err)
687 goto reterr;
688 p9pdu_finalize(req->tc);
689 return req;
690 reterr:
691 p9_free_req(c, req);
692 return ERR_PTR(err);
693 }
694
695 /**
696 * p9_client_rpc - issue a request and wait for a response
697 * @c: client session
698 * @type: type of request
699 * @fmt: protocol format string (see protocol.c)
700 *
701 * Returns request structure (which client must free using p9_free_req)
702 */
703
704 static struct p9_req_t *
705 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
706 {
707 va_list ap;
708 int sigpending, err;
709 unsigned long flags;
710 struct p9_req_t *req;
711
712 va_start(ap, fmt);
713 req = p9_client_prepare_req(c, type, c->msize, fmt, ap);
714 va_end(ap);
715 if (IS_ERR(req))
716 return req;
717
718 if (signal_pending(current)) {
719 sigpending = 1;
720 clear_thread_flag(TIF_SIGPENDING);
721 } else
722 sigpending = 0;
723
724 err = c->trans_mod->request(c, req);
725 if (err < 0) {
726 if (err != -ERESTARTSYS && err != -EFAULT)
727 c->status = Disconnected;
728 goto reterr;
729 }
730 /* Wait for the response */
731 err = wait_event_interruptible(*req->wq,
732 req->status >= REQ_STATUS_RCVD);
733
734 if (req->status == REQ_STATUS_ERROR) {
735 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
736 err = req->t_err;
737 }
738 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
739 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
740 sigpending = 1;
741 clear_thread_flag(TIF_SIGPENDING);
742
743 if (c->trans_mod->cancel(c, req))
744 p9_client_flush(c, req);
745
746 /* if we received the response anyway, don't signal error */
747 if (req->status == REQ_STATUS_RCVD)
748 err = 0;
749 }
750 if (sigpending) {
751 spin_lock_irqsave(&current->sighand->siglock, flags);
752 recalc_sigpending();
753 spin_unlock_irqrestore(&current->sighand->siglock, flags);
754 }
755 if (err < 0)
756 goto reterr;
757
758 err = p9_check_errors(c, req);
759 if (!err) {
760 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
761 return req;
762 }
763 reterr:
764 P9_DPRINTK(P9_DEBUG_MUX,
765 "exit: client %p op %d error: %d\n", c, type, err);
766 p9_free_req(c, req);
767 return ERR_PTR(err);
768 }
769
770 /**
771 * p9_client_zc_rpc - issue a request and wait for a response
772 * @c: client session
773 * @type: type of request
774 * @uidata: user bffer that should be ued for zero copy read
775 * @uodata: user buffer that shoud be user for zero copy write
776 * @inlen: read buffer size
777 * @olen: write buffer size
778 * @hdrlen: reader header size, This is the size of response protocol data
779 * @fmt: protocol format string (see protocol.c)
780 *
781 * Returns request structure (which client must free using p9_free_req)
782 */
783 static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
784 char *uidata, char *uodata,
785 int inlen, int olen, int in_hdrlen,
786 int kern_buf, const char *fmt, ...)
787 {
788 va_list ap;
789 int sigpending, err;
790 unsigned long flags;
791 struct p9_req_t *req;
792
793 va_start(ap, fmt);
794 /*
795 * We allocate a inline protocol data of only 4k bytes.
796 * The actual content is passed in zero-copy fashion.
797 */
798 req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap);
799 va_end(ap);
800 if (IS_ERR(req))
801 return req;
802
803 if (signal_pending(current)) {
804 sigpending = 1;
805 clear_thread_flag(TIF_SIGPENDING);
806 } else
807 sigpending = 0;
808
809 /* If we are called with KERNEL_DS force kern_buf */
810 if (segment_eq(get_fs(), KERNEL_DS))
811 kern_buf = 1;
812
813 err = c->trans_mod->zc_request(c, req, uidata, uodata,
814 inlen, olen, in_hdrlen, kern_buf);
815 if (err < 0) {
816 if (err == -EIO)
817 c->status = Disconnected;
818 goto reterr;
819 }
820 if (req->status == REQ_STATUS_ERROR) {
821 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
822 err = req->t_err;
823 }
824 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
825 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
826 sigpending = 1;
827 clear_thread_flag(TIF_SIGPENDING);
828
829 if (c->trans_mod->cancel(c, req))
830 p9_client_flush(c, req);
831
832 /* if we received the response anyway, don't signal error */
833 if (req->status == REQ_STATUS_RCVD)
834 err = 0;
835 }
836 if (sigpending) {
837 spin_lock_irqsave(&current->sighand->siglock, flags);
838 recalc_sigpending();
839 spin_unlock_irqrestore(&current->sighand->siglock, flags);
840 }
841 if (err < 0)
842 goto reterr;
843
844 err = p9_check_zc_errors(c, req, uidata, in_hdrlen, kern_buf);
845 if (!err) {
846 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
847 return req;
848 }
849 reterr:
850 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
851 err);
852 p9_free_req(c, req);
853 return ERR_PTR(err);
854 }
855
856 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
857 {
858 int ret;
859 struct p9_fid *fid;
860 unsigned long flags;
861
862 P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
863 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
864 if (!fid)
865 return ERR_PTR(-ENOMEM);
866
867 ret = p9_idpool_get(clnt->fidpool);
868 if (ret < 0) {
869 ret = -ENOSPC;
870 goto error;
871 }
872 fid->fid = ret;
873
874 memset(&fid->qid, 0, sizeof(struct p9_qid));
875 fid->mode = -1;
876 fid->uid = current_fsuid();
877 fid->clnt = clnt;
878 fid->rdir = NULL;
879 spin_lock_irqsave(&clnt->lock, flags);
880 list_add(&fid->flist, &clnt->fidlist);
881 spin_unlock_irqrestore(&clnt->lock, flags);
882
883 return fid;
884
885 error:
886 kfree(fid);
887 return ERR_PTR(ret);
888 }
889
890 static void p9_fid_destroy(struct p9_fid *fid)
891 {
892 struct p9_client *clnt;
893 unsigned long flags;
894
895 P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
896 clnt = fid->clnt;
897 p9_idpool_put(fid->fid, clnt->fidpool);
898 spin_lock_irqsave(&clnt->lock, flags);
899 list_del(&fid->flist);
900 spin_unlock_irqrestore(&clnt->lock, flags);
901 kfree(fid->rdir);
902 kfree(fid);
903 }
904
905 static int p9_client_version(struct p9_client *c)
906 {
907 int err = 0;
908 struct p9_req_t *req;
909 char *version;
910 int msize;
911
912 P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
913 c->msize, c->proto_version);
914
915 switch (c->proto_version) {
916 case p9_proto_2000L:
917 req = p9_client_rpc(c, P9_TVERSION, "ds",
918 c->msize, "9P2000.L");
919 break;
920 case p9_proto_2000u:
921 req = p9_client_rpc(c, P9_TVERSION, "ds",
922 c->msize, "9P2000.u");
923 break;
924 case p9_proto_legacy:
925 req = p9_client_rpc(c, P9_TVERSION, "ds",
926 c->msize, "9P2000");
927 break;
928 default:
929 return -EINVAL;
930 break;
931 }
932
933 if (IS_ERR(req))
934 return PTR_ERR(req);
935
936 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
937 if (err) {
938 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
939 P9_DUMP_PKT(1, req->rc);
940 goto error;
941 }
942
943 P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
944 if (!strncmp(version, "9P2000.L", 8))
945 c->proto_version = p9_proto_2000L;
946 else if (!strncmp(version, "9P2000.u", 8))
947 c->proto_version = p9_proto_2000u;
948 else if (!strncmp(version, "9P2000", 6))
949 c->proto_version = p9_proto_legacy;
950 else {
951 err = -EREMOTEIO;
952 goto error;
953 }
954
955 if (msize < c->msize)
956 c->msize = msize;
957
958 error:
959 kfree(version);
960 p9_free_req(c, req);
961
962 return err;
963 }
964
965 struct p9_client *p9_client_create(const char *dev_name, char *options)
966 {
967 int err;
968 struct p9_client *clnt;
969
970 err = 0;
971 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
972 if (!clnt)
973 return ERR_PTR(-ENOMEM);
974
975 clnt->trans_mod = NULL;
976 clnt->trans = NULL;
977 spin_lock_init(&clnt->lock);
978 INIT_LIST_HEAD(&clnt->fidlist);
979
980 err = p9_tag_init(clnt);
981 if (err < 0)
982 goto free_client;
983
984 err = parse_opts(options, clnt);
985 if (err < 0)
986 goto destroy_tagpool;
987
988 if (!clnt->trans_mod)
989 clnt->trans_mod = v9fs_get_default_trans();
990
991 if (clnt->trans_mod == NULL) {
992 err = -EPROTONOSUPPORT;
993 P9_DPRINTK(P9_DEBUG_ERROR,
994 "No transport defined or default transport\n");
995 goto destroy_tagpool;
996 }
997
998 clnt->fidpool = p9_idpool_create();
999 if (IS_ERR(clnt->fidpool)) {
1000 err = PTR_ERR(clnt->fidpool);
1001 goto put_trans;
1002 }
1003
1004 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
1005 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
1006
1007 err = clnt->trans_mod->create(clnt, dev_name, options);
1008 if (err)
1009 goto destroy_fidpool;
1010
1011 if (clnt->msize > clnt->trans_mod->maxsize)
1012 clnt->msize = clnt->trans_mod->maxsize;
1013
1014 err = p9_client_version(clnt);
1015 if (err)
1016 goto close_trans;
1017
1018 return clnt;
1019
1020 close_trans:
1021 clnt->trans_mod->close(clnt);
1022 destroy_fidpool:
1023 p9_idpool_destroy(clnt->fidpool);
1024 put_trans:
1025 v9fs_put_trans(clnt->trans_mod);
1026 destroy_tagpool:
1027 p9_idpool_destroy(clnt->tagpool);
1028 free_client:
1029 kfree(clnt);
1030 return ERR_PTR(err);
1031 }
1032 EXPORT_SYMBOL(p9_client_create);
1033
1034 void p9_client_destroy(struct p9_client *clnt)
1035 {
1036 struct p9_fid *fid, *fidptr;
1037
1038 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt);
1039
1040 if (clnt->trans_mod)
1041 clnt->trans_mod->close(clnt);
1042
1043 v9fs_put_trans(clnt->trans_mod);
1044
1045 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
1046 printk(KERN_INFO "Found fid %d not clunked\n", fid->fid);
1047 p9_fid_destroy(fid);
1048 }
1049
1050 if (clnt->fidpool)
1051 p9_idpool_destroy(clnt->fidpool);
1052
1053 p9_tag_cleanup(clnt);
1054
1055 kfree(clnt);
1056 }
1057 EXPORT_SYMBOL(p9_client_destroy);
1058
1059 void p9_client_disconnect(struct p9_client *clnt)
1060 {
1061 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
1062 clnt->status = Disconnected;
1063 }
1064 EXPORT_SYMBOL(p9_client_disconnect);
1065
1066 void p9_client_begin_disconnect(struct p9_client *clnt)
1067 {
1068 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
1069 clnt->status = BeginDisconnect;
1070 }
1071 EXPORT_SYMBOL(p9_client_begin_disconnect);
1072
1073 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
1074 char *uname, u32 n_uname, char *aname)
1075 {
1076 int err;
1077 struct p9_req_t *req;
1078 struct p9_fid *fid;
1079 struct p9_qid qid;
1080
1081 P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
1082 afid ? afid->fid : -1, uname, aname);
1083 err = 0;
1084
1085 fid = p9_fid_create(clnt);
1086 if (IS_ERR(fid)) {
1087 err = PTR_ERR(fid);
1088 fid = NULL;
1089 goto error;
1090 }
1091
1092 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
1093 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
1094 if (IS_ERR(req)) {
1095 err = PTR_ERR(req);
1096 goto error;
1097 }
1098
1099 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
1100 if (err) {
1101 P9_DUMP_PKT(1, req->rc);
1102 p9_free_req(clnt, req);
1103 goto error;
1104 }
1105
1106 P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
1107 qid.type,
1108 (unsigned long long)qid.path,
1109 qid.version);
1110
1111 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
1112
1113 p9_free_req(clnt, req);
1114 return fid;
1115
1116 error:
1117 if (fid)
1118 p9_fid_destroy(fid);
1119 return ERR_PTR(err);
1120 }
1121 EXPORT_SYMBOL(p9_client_attach);
1122
1123 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
1124 char **wnames, int clone)
1125 {
1126 int err;
1127 struct p9_client *clnt;
1128 struct p9_fid *fid;
1129 struct p9_qid *wqids;
1130 struct p9_req_t *req;
1131 uint16_t nwqids, count;
1132
1133 err = 0;
1134 wqids = NULL;
1135 clnt = oldfid->clnt;
1136 if (clone) {
1137 fid = p9_fid_create(clnt);
1138 if (IS_ERR(fid)) {
1139 err = PTR_ERR(fid);
1140 fid = NULL;
1141 goto error;
1142 }
1143
1144 fid->uid = oldfid->uid;
1145 } else
1146 fid = oldfid;
1147
1148
1149 P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
1150 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
1151
1152 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
1153 nwname, wnames);
1154 if (IS_ERR(req)) {
1155 err = PTR_ERR(req);
1156 goto error;
1157 }
1158
1159 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
1160 if (err) {
1161 P9_DUMP_PKT(1, req->rc);
1162 p9_free_req(clnt, req);
1163 goto clunk_fid;
1164 }
1165 p9_free_req(clnt, req);
1166
1167 P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1168
1169 if (nwqids != nwname) {
1170 err = -ENOENT;
1171 goto clunk_fid;
1172 }
1173
1174 for (count = 0; count < nwqids; count++)
1175 P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1176 count, wqids[count].type,
1177 (unsigned long long)wqids[count].path,
1178 wqids[count].version);
1179
1180 if (nwname)
1181 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1182 else
1183 fid->qid = oldfid->qid;
1184
1185 kfree(wqids);
1186 return fid;
1187
1188 clunk_fid:
1189 kfree(wqids);
1190 p9_client_clunk(fid);
1191 fid = NULL;
1192
1193 error:
1194 if (fid && (fid != oldfid))
1195 p9_fid_destroy(fid);
1196
1197 return ERR_PTR(err);
1198 }
1199 EXPORT_SYMBOL(p9_client_walk);
1200
1201 int p9_client_open(struct p9_fid *fid, int mode)
1202 {
1203 int err;
1204 struct p9_client *clnt;
1205 struct p9_req_t *req;
1206 struct p9_qid qid;
1207 int iounit;
1208
1209 clnt = fid->clnt;
1210 P9_DPRINTK(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1211 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1212 err = 0;
1213
1214 if (fid->mode != -1)
1215 return -EINVAL;
1216
1217 if (p9_is_proto_dotl(clnt))
1218 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1219 else
1220 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1221 if (IS_ERR(req)) {
1222 err = PTR_ERR(req);
1223 goto error;
1224 }
1225
1226 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1227 if (err) {
1228 P9_DUMP_PKT(1, req->rc);
1229 goto free_and_error;
1230 }
1231
1232 P9_DPRINTK(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1233 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1234 (unsigned long long)qid.path, qid.version, iounit);
1235
1236 fid->mode = mode;
1237 fid->iounit = iounit;
1238
1239 free_and_error:
1240 p9_free_req(clnt, req);
1241 error:
1242 return err;
1243 }
1244 EXPORT_SYMBOL(p9_client_open);
1245
1246 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1247 gid_t gid, struct p9_qid *qid)
1248 {
1249 int err = 0;
1250 struct p9_client *clnt;
1251 struct p9_req_t *req;
1252 int iounit;
1253
1254 P9_DPRINTK(P9_DEBUG_9P,
1255 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1256 ofid->fid, name, flags, mode, gid);
1257 clnt = ofid->clnt;
1258
1259 if (ofid->mode != -1)
1260 return -EINVAL;
1261
1262 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags,
1263 mode, gid);
1264 if (IS_ERR(req)) {
1265 err = PTR_ERR(req);
1266 goto error;
1267 }
1268
1269 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1270 if (err) {
1271 P9_DUMP_PKT(1, req->rc);
1272 goto free_and_error;
1273 }
1274
1275 P9_DPRINTK(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1276 qid->type,
1277 (unsigned long long)qid->path,
1278 qid->version, iounit);
1279
1280 ofid->mode = mode;
1281 ofid->iounit = iounit;
1282
1283 free_and_error:
1284 p9_free_req(clnt, req);
1285 error:
1286 return err;
1287 }
1288 EXPORT_SYMBOL(p9_client_create_dotl);
1289
1290 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1291 char *extension)
1292 {
1293 int err;
1294 struct p9_client *clnt;
1295 struct p9_req_t *req;
1296 struct p9_qid qid;
1297 int iounit;
1298
1299 P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1300 fid->fid, name, perm, mode);
1301 err = 0;
1302 clnt = fid->clnt;
1303
1304 if (fid->mode != -1)
1305 return -EINVAL;
1306
1307 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1308 mode, extension);
1309 if (IS_ERR(req)) {
1310 err = PTR_ERR(req);
1311 goto error;
1312 }
1313
1314 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1315 if (err) {
1316 P9_DUMP_PKT(1, req->rc);
1317 goto free_and_error;
1318 }
1319
1320 P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1321 qid.type,
1322 (unsigned long long)qid.path,
1323 qid.version, iounit);
1324
1325 fid->mode = mode;
1326 fid->iounit = iounit;
1327
1328 free_and_error:
1329 p9_free_req(clnt, req);
1330 error:
1331 return err;
1332 }
1333 EXPORT_SYMBOL(p9_client_fcreate);
1334
1335 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid,
1336 struct p9_qid *qid)
1337 {
1338 int err = 0;
1339 struct p9_client *clnt;
1340 struct p9_req_t *req;
1341
1342 P9_DPRINTK(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1343 dfid->fid, name, symtgt);
1344 clnt = dfid->clnt;
1345
1346 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt,
1347 gid);
1348 if (IS_ERR(req)) {
1349 err = PTR_ERR(req);
1350 goto error;
1351 }
1352
1353 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1354 if (err) {
1355 P9_DUMP_PKT(1, req->rc);
1356 goto free_and_error;
1357 }
1358
1359 P9_DPRINTK(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1360 qid->type, (unsigned long long)qid->path, qid->version);
1361
1362 free_and_error:
1363 p9_free_req(clnt, req);
1364 error:
1365 return err;
1366 }
1367 EXPORT_SYMBOL(p9_client_symlink);
1368
1369 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1370 {
1371 struct p9_client *clnt;
1372 struct p9_req_t *req;
1373
1374 P9_DPRINTK(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1375 dfid->fid, oldfid->fid, newname);
1376 clnt = dfid->clnt;
1377 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1378 newname);
1379 if (IS_ERR(req))
1380 return PTR_ERR(req);
1381
1382 P9_DPRINTK(P9_DEBUG_9P, "<<< RLINK\n");
1383 p9_free_req(clnt, req);
1384 return 0;
1385 }
1386 EXPORT_SYMBOL(p9_client_link);
1387
1388 int p9_client_fsync(struct p9_fid *fid, int datasync)
1389 {
1390 int err;
1391 struct p9_client *clnt;
1392 struct p9_req_t *req;
1393
1394 P9_DPRINTK(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1395 fid->fid, datasync);
1396 err = 0;
1397 clnt = fid->clnt;
1398
1399 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1400 if (IS_ERR(req)) {
1401 err = PTR_ERR(req);
1402 goto error;
1403 }
1404
1405 P9_DPRINTK(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1406
1407 p9_free_req(clnt, req);
1408
1409 error:
1410 return err;
1411 }
1412 EXPORT_SYMBOL(p9_client_fsync);
1413
1414 int p9_client_clunk(struct p9_fid *fid)
1415 {
1416 int err;
1417 struct p9_client *clnt;
1418 struct p9_req_t *req;
1419
1420 if (!fid) {
1421 P9_EPRINTK(KERN_WARNING, "Trying to clunk with NULL fid\n");
1422 dump_stack();
1423 return 0;
1424 }
1425
1426 P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
1427 err = 0;
1428 clnt = fid->clnt;
1429
1430 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1431 if (IS_ERR(req)) {
1432 err = PTR_ERR(req);
1433 goto error;
1434 }
1435
1436 P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1437
1438 p9_free_req(clnt, req);
1439 error:
1440 /*
1441 * Fid is not valid even after a failed clunk
1442 */
1443 p9_fid_destroy(fid);
1444 return err;
1445 }
1446 EXPORT_SYMBOL(p9_client_clunk);
1447
1448 int p9_client_remove(struct p9_fid *fid)
1449 {
1450 int err;
1451 struct p9_client *clnt;
1452 struct p9_req_t *req;
1453
1454 P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1455 err = 0;
1456 clnt = fid->clnt;
1457
1458 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1459 if (IS_ERR(req)) {
1460 err = PTR_ERR(req);
1461 goto error;
1462 }
1463
1464 P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1465
1466 p9_free_req(clnt, req);
1467 error:
1468 p9_fid_destroy(fid);
1469 return err;
1470 }
1471 EXPORT_SYMBOL(p9_client_remove);
1472
1473 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1474 {
1475 int err = 0;
1476 struct p9_req_t *req;
1477 struct p9_client *clnt;
1478
1479 P9_DPRINTK(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1480 dfid->fid, name, flags);
1481
1482 clnt = dfid->clnt;
1483 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1484 if (IS_ERR(req)) {
1485 err = PTR_ERR(req);
1486 goto error;
1487 }
1488 P9_DPRINTK(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1489
1490 p9_free_req(clnt, req);
1491 error:
1492 return err;
1493 }
1494 EXPORT_SYMBOL(p9_client_unlinkat);
1495
1496 int
1497 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1498 u32 count)
1499 {
1500 char *dataptr;
1501 int kernel_buf = 0;
1502 struct p9_req_t *req;
1503 struct p9_client *clnt;
1504 int err, rsize, non_zc = 0;
1505
1506
1507 P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n",
1508 fid->fid, (long long unsigned) offset, count);
1509 err = 0;
1510 clnt = fid->clnt;
1511
1512 rsize = fid->iounit;
1513 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1514 rsize = clnt->msize - P9_IOHDRSZ;
1515
1516 if (count < rsize)
1517 rsize = count;
1518
1519 /* Don't bother zerocopy for small IO (< 1024) */
1520 if (clnt->trans_mod->zc_request && rsize > 1024) {
1521 char *indata;
1522 if (data) {
1523 kernel_buf = 1;
1524 indata = data;
1525 } else
1526 indata = (char *)udata;
1527 /*
1528 * response header len is 11
1529 * PDU Header(7) + IO Size (4)
1530 */
1531 req = p9_client_zc_rpc(clnt, P9_TREAD, indata, NULL, rsize, 0,
1532 11, kernel_buf, "dqd", fid->fid,
1533 offset, rsize);
1534 } else {
1535 non_zc = 1;
1536 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1537 rsize);
1538 }
1539 if (IS_ERR(req)) {
1540 err = PTR_ERR(req);
1541 goto error;
1542 }
1543
1544 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1545 if (err) {
1546 P9_DUMP_PKT(1, req->rc);
1547 goto free_and_error;
1548 }
1549
1550 P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1551 P9_DUMP_PKT(1, req->rc);
1552
1553 if (non_zc) {
1554 if (data) {
1555 memmove(data, dataptr, count);
1556 } else {
1557 err = copy_to_user(udata, dataptr, count);
1558 if (err) {
1559 err = -EFAULT;
1560 goto free_and_error;
1561 }
1562 }
1563 }
1564 p9_free_req(clnt, req);
1565 return count;
1566
1567 free_and_error:
1568 p9_free_req(clnt, req);
1569 error:
1570 return err;
1571 }
1572 EXPORT_SYMBOL(p9_client_read);
1573
1574 int
1575 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1576 u64 offset, u32 count)
1577 {
1578 int err, rsize;
1579 int kernel_buf = 0;
1580 struct p9_client *clnt;
1581 struct p9_req_t *req;
1582
1583 P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1584 fid->fid, (long long unsigned) offset, count);
1585 err = 0;
1586 clnt = fid->clnt;
1587
1588 rsize = fid->iounit;
1589 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1590 rsize = clnt->msize - P9_IOHDRSZ;
1591
1592 if (count < rsize)
1593 rsize = count;
1594
1595 /* Don't bother zerocopy for small IO (< 1024) */
1596 if (clnt->trans_mod->zc_request && rsize > 1024) {
1597 char *odata;
1598 if (data) {
1599 kernel_buf = 1;
1600 odata = data;
1601 } else
1602 odata = (char *)udata;
1603 req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, odata, 0, rsize,
1604 P9_ZC_HDR_SZ, kernel_buf, "dqd",
1605 fid->fid, offset, rsize);
1606 } else {
1607 if (data)
1608 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
1609 offset, rsize, data);
1610 else
1611 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
1612 offset, rsize, udata);
1613 }
1614 if (IS_ERR(req)) {
1615 err = PTR_ERR(req);
1616 goto error;
1617 }
1618
1619 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1620 if (err) {
1621 P9_DUMP_PKT(1, req->rc);
1622 goto free_and_error;
1623 }
1624
1625 P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1626
1627 p9_free_req(clnt, req);
1628 return count;
1629
1630 free_and_error:
1631 p9_free_req(clnt, req);
1632 error:
1633 return err;
1634 }
1635 EXPORT_SYMBOL(p9_client_write);
1636
1637 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1638 {
1639 int err;
1640 struct p9_client *clnt;
1641 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1642 struct p9_req_t *req;
1643 u16 ignored;
1644
1645 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1646
1647 if (!ret)
1648 return ERR_PTR(-ENOMEM);
1649
1650 err = 0;
1651 clnt = fid->clnt;
1652
1653 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1654 if (IS_ERR(req)) {
1655 err = PTR_ERR(req);
1656 goto error;
1657 }
1658
1659 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1660 if (err) {
1661 P9_DUMP_PKT(1, req->rc);
1662 p9_free_req(clnt, req);
1663 goto error;
1664 }
1665
1666 P9_DPRINTK(P9_DEBUG_9P,
1667 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1668 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1669 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1670 "<<< uid=%d gid=%d n_muid=%d\n",
1671 ret->size, ret->type, ret->dev, ret->qid.type,
1672 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1673 ret->atime, ret->mtime, (unsigned long long)ret->length,
1674 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1675 ret->n_uid, ret->n_gid, ret->n_muid);
1676
1677 p9_free_req(clnt, req);
1678 return ret;
1679
1680 error:
1681 kfree(ret);
1682 return ERR_PTR(err);
1683 }
1684 EXPORT_SYMBOL(p9_client_stat);
1685
1686 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1687 u64 request_mask)
1688 {
1689 int err;
1690 struct p9_client *clnt;
1691 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1692 GFP_KERNEL);
1693 struct p9_req_t *req;
1694
1695 P9_DPRINTK(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1696 fid->fid, request_mask);
1697
1698 if (!ret)
1699 return ERR_PTR(-ENOMEM);
1700
1701 err = 0;
1702 clnt = fid->clnt;
1703
1704 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1705 if (IS_ERR(req)) {
1706 err = PTR_ERR(req);
1707 goto error;
1708 }
1709
1710 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1711 if (err) {
1712 P9_DUMP_PKT(1, req->rc);
1713 p9_free_req(clnt, req);
1714 goto error;
1715 }
1716
1717 P9_DPRINTK(P9_DEBUG_9P,
1718 "<<< RGETATTR st_result_mask=%lld\n"
1719 "<<< qid=%x.%llx.%x\n"
1720 "<<< st_mode=%8.8x st_nlink=%llu\n"
1721 "<<< st_uid=%d st_gid=%d\n"
1722 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1723 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1724 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1725 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1726 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1727 "<<< st_gen=%lld st_data_version=%lld",
1728 ret->st_result_mask, ret->qid.type, ret->qid.path,
1729 ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid,
1730 ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize,
1731 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1732 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1733 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1734 ret->st_gen, ret->st_data_version);
1735
1736 p9_free_req(clnt, req);
1737 return ret;
1738
1739 error:
1740 kfree(ret);
1741 return ERR_PTR(err);
1742 }
1743 EXPORT_SYMBOL(p9_client_getattr_dotl);
1744
1745 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1746 {
1747 int ret;
1748
1749 /* NOTE: size shouldn't include its own length */
1750 /* size[2] type[2] dev[4] qid[13] */
1751 /* mode[4] atime[4] mtime[4] length[8]*/
1752 /* name[s] uid[s] gid[s] muid[s] */
1753 ret = 2+4+13+4+4+4+8+2+2+2+2;
1754
1755 if (wst->name)
1756 ret += strlen(wst->name);
1757 if (wst->uid)
1758 ret += strlen(wst->uid);
1759 if (wst->gid)
1760 ret += strlen(wst->gid);
1761 if (wst->muid)
1762 ret += strlen(wst->muid);
1763
1764 if ((proto_version == p9_proto_2000u) ||
1765 (proto_version == p9_proto_2000L)) {
1766 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1767 if (wst->extension)
1768 ret += strlen(wst->extension);
1769 }
1770
1771 return ret;
1772 }
1773
1774 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1775 {
1776 int err;
1777 struct p9_req_t *req;
1778 struct p9_client *clnt;
1779
1780 err = 0;
1781 clnt = fid->clnt;
1782 wst->size = p9_client_statsize(wst, clnt->proto_version);
1783 P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1784 P9_DPRINTK(P9_DEBUG_9P,
1785 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1786 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1787 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1788 " uid=%d gid=%d n_muid=%d\n",
1789 wst->size, wst->type, wst->dev, wst->qid.type,
1790 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1791 wst->atime, wst->mtime, (unsigned long long)wst->length,
1792 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1793 wst->n_uid, wst->n_gid, wst->n_muid);
1794
1795 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1796 if (IS_ERR(req)) {
1797 err = PTR_ERR(req);
1798 goto error;
1799 }
1800
1801 P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1802
1803 p9_free_req(clnt, req);
1804 error:
1805 return err;
1806 }
1807 EXPORT_SYMBOL(p9_client_wstat);
1808
1809 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1810 {
1811 int err;
1812 struct p9_req_t *req;
1813 struct p9_client *clnt;
1814
1815 err = 0;
1816 clnt = fid->clnt;
1817 P9_DPRINTK(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1818 P9_DPRINTK(P9_DEBUG_9P,
1819 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1820 " atime_sec=%lld atime_nsec=%lld\n"
1821 " mtime_sec=%lld mtime_nsec=%lld\n",
1822 p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid,
1823 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1824 p9attr->mtime_sec, p9attr->mtime_nsec);
1825
1826 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1827
1828 if (IS_ERR(req)) {
1829 err = PTR_ERR(req);
1830 goto error;
1831 }
1832 P9_DPRINTK(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1833 p9_free_req(clnt, req);
1834 error:
1835 return err;
1836 }
1837 EXPORT_SYMBOL(p9_client_setattr);
1838
1839 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1840 {
1841 int err;
1842 struct p9_req_t *req;
1843 struct p9_client *clnt;
1844
1845 err = 0;
1846 clnt = fid->clnt;
1847
1848 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1849
1850 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1851 if (IS_ERR(req)) {
1852 err = PTR_ERR(req);
1853 goto error;
1854 }
1855
1856 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1857 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1858 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1859 if (err) {
1860 P9_DUMP_PKT(1, req->rc);
1861 p9_free_req(clnt, req);
1862 goto error;
1863 }
1864
1865 P9_DPRINTK(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1866 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1867 "fsid %llu namelen %ld\n",
1868 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1869 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1870 sb->fsid, (long int)sb->namelen);
1871
1872 p9_free_req(clnt, req);
1873 error:
1874 return err;
1875 }
1876 EXPORT_SYMBOL(p9_client_statfs);
1877
1878 int p9_client_rename(struct p9_fid *fid,
1879 struct p9_fid *newdirfid, const char *name)
1880 {
1881 int err;
1882 struct p9_req_t *req;
1883 struct p9_client *clnt;
1884
1885 err = 0;
1886 clnt = fid->clnt;
1887
1888 P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1889 fid->fid, newdirfid->fid, name);
1890
1891 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1892 newdirfid->fid, name);
1893 if (IS_ERR(req)) {
1894 err = PTR_ERR(req);
1895 goto error;
1896 }
1897
1898 P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1899
1900 p9_free_req(clnt, req);
1901 error:
1902 return err;
1903 }
1904 EXPORT_SYMBOL(p9_client_rename);
1905
1906 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1907 struct p9_fid *newdirfid, const char *new_name)
1908 {
1909 int err;
1910 struct p9_req_t *req;
1911 struct p9_client *clnt;
1912
1913 err = 0;
1914 clnt = olddirfid->clnt;
1915
1916 P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1917 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1918 newdirfid->fid, new_name);
1919
1920 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1921 old_name, newdirfid->fid, new_name);
1922 if (IS_ERR(req)) {
1923 err = PTR_ERR(req);
1924 goto error;
1925 }
1926
1927 P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1928 newdirfid->fid, new_name);
1929
1930 p9_free_req(clnt, req);
1931 error:
1932 return err;
1933 }
1934 EXPORT_SYMBOL(p9_client_renameat);
1935
1936 /*
1937 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1938 */
1939 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1940 const char *attr_name, u64 *attr_size)
1941 {
1942 int err;
1943 struct p9_req_t *req;
1944 struct p9_client *clnt;
1945 struct p9_fid *attr_fid;
1946
1947 err = 0;
1948 clnt = file_fid->clnt;
1949 attr_fid = p9_fid_create(clnt);
1950 if (IS_ERR(attr_fid)) {
1951 err = PTR_ERR(attr_fid);
1952 attr_fid = NULL;
1953 goto error;
1954 }
1955 P9_DPRINTK(P9_DEBUG_9P,
1956 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
1957 file_fid->fid, attr_fid->fid, attr_name);
1958
1959 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
1960 file_fid->fid, attr_fid->fid, attr_name);
1961 if (IS_ERR(req)) {
1962 err = PTR_ERR(req);
1963 goto error;
1964 }
1965 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
1966 if (err) {
1967 P9_DUMP_PKT(1, req->rc);
1968 p9_free_req(clnt, req);
1969 goto clunk_fid;
1970 }
1971 p9_free_req(clnt, req);
1972 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
1973 attr_fid->fid, *attr_size);
1974 return attr_fid;
1975 clunk_fid:
1976 p9_client_clunk(attr_fid);
1977 attr_fid = NULL;
1978 error:
1979 if (attr_fid && (attr_fid != file_fid))
1980 p9_fid_destroy(attr_fid);
1981
1982 return ERR_PTR(err);
1983 }
1984 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
1985
1986 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
1987 u64 attr_size, int flags)
1988 {
1989 int err;
1990 struct p9_req_t *req;
1991 struct p9_client *clnt;
1992
1993 P9_DPRINTK(P9_DEBUG_9P,
1994 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
1995 fid->fid, name, (long long)attr_size, flags);
1996 err = 0;
1997 clnt = fid->clnt;
1998 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
1999 fid->fid, name, attr_size, flags);
2000 if (IS_ERR(req)) {
2001 err = PTR_ERR(req);
2002 goto error;
2003 }
2004 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
2005 p9_free_req(clnt, req);
2006 error:
2007 return err;
2008 }
2009 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
2010
2011 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
2012 {
2013 int err, rsize, non_zc = 0;
2014 struct p9_client *clnt;
2015 struct p9_req_t *req;
2016 char *dataptr;
2017
2018 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
2019 fid->fid, (long long unsigned) offset, count);
2020
2021 err = 0;
2022 clnt = fid->clnt;
2023
2024 rsize = fid->iounit;
2025 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
2026 rsize = clnt->msize - P9_READDIRHDRSZ;
2027
2028 if (count < rsize)
2029 rsize = count;
2030
2031 /* Don't bother zerocopy for small IO (< 1024) */
2032 if (clnt->trans_mod->zc_request && rsize > 1024) {
2033 /*
2034 * response header len is 11
2035 * PDU Header(7) + IO Size (4)
2036 */
2037 req = p9_client_zc_rpc(clnt, P9_TREADDIR, data, NULL, rsize, 0,
2038 11, 1, "dqd", fid->fid, offset, rsize);
2039 } else {
2040 non_zc = 1;
2041 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
2042 offset, rsize);
2043 }
2044 if (IS_ERR(req)) {
2045 err = PTR_ERR(req);
2046 goto error;
2047 }
2048
2049 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
2050 if (err) {
2051 P9_DUMP_PKT(1, req->rc);
2052 goto free_and_error;
2053 }
2054
2055 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
2056
2057 if (non_zc)
2058 memmove(data, dataptr, count);
2059
2060 p9_free_req(clnt, req);
2061 return count;
2062
2063 free_and_error:
2064 p9_free_req(clnt, req);
2065 error:
2066 return err;
2067 }
2068 EXPORT_SYMBOL(p9_client_readdir);
2069
2070 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
2071 dev_t rdev, gid_t gid, struct p9_qid *qid)
2072 {
2073 int err;
2074 struct p9_client *clnt;
2075 struct p9_req_t *req;
2076
2077 err = 0;
2078 clnt = fid->clnt;
2079 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
2080 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
2081 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode,
2082 MAJOR(rdev), MINOR(rdev), gid);
2083 if (IS_ERR(req))
2084 return PTR_ERR(req);
2085
2086 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2087 if (err) {
2088 P9_DUMP_PKT(1, req->rc);
2089 goto error;
2090 }
2091 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
2092 (unsigned long long)qid->path, qid->version);
2093
2094 error:
2095 p9_free_req(clnt, req);
2096 return err;
2097
2098 }
2099 EXPORT_SYMBOL(p9_client_mknod_dotl);
2100
2101 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
2102 gid_t gid, struct p9_qid *qid)
2103 {
2104 int err;
2105 struct p9_client *clnt;
2106 struct p9_req_t *req;
2107
2108 err = 0;
2109 clnt = fid->clnt;
2110 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
2111 fid->fid, name, mode, gid);
2112 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode,
2113 gid);
2114 if (IS_ERR(req))
2115 return PTR_ERR(req);
2116
2117 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
2118 if (err) {
2119 P9_DUMP_PKT(1, req->rc);
2120 goto error;
2121 }
2122 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
2123 (unsigned long long)qid->path, qid->version);
2124
2125 error:
2126 p9_free_req(clnt, req);
2127 return err;
2128
2129 }
2130 EXPORT_SYMBOL(p9_client_mkdir_dotl);
2131
2132 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
2133 {
2134 int err;
2135 struct p9_client *clnt;
2136 struct p9_req_t *req;
2137
2138 err = 0;
2139 clnt = fid->clnt;
2140 P9_DPRINTK(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
2141 "start %lld length %lld proc_id %d client_id %s\n",
2142 fid->fid, flock->type, flock->flags, flock->start,
2143 flock->length, flock->proc_id, flock->client_id);
2144
2145 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
2146 flock->flags, flock->start, flock->length,
2147 flock->proc_id, flock->client_id);
2148
2149 if (IS_ERR(req))
2150 return PTR_ERR(req);
2151
2152 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
2153 if (err) {
2154 P9_DUMP_PKT(1, req->rc);
2155 goto error;
2156 }
2157 P9_DPRINTK(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
2158 error:
2159 p9_free_req(clnt, req);
2160 return err;
2161
2162 }
2163 EXPORT_SYMBOL(p9_client_lock_dotl);
2164
2165 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
2166 {
2167 int err;
2168 struct p9_client *clnt;
2169 struct p9_req_t *req;
2170
2171 err = 0;
2172 clnt = fid->clnt;
2173 P9_DPRINTK(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
2174 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
2175 glock->start, glock->length, glock->proc_id, glock->client_id);
2176
2177 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
2178 glock->start, glock->length, glock->proc_id, glock->client_id);
2179
2180 if (IS_ERR(req))
2181 return PTR_ERR(req);
2182
2183 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
2184 &glock->start, &glock->length, &glock->proc_id,
2185 &glock->client_id);
2186 if (err) {
2187 P9_DUMP_PKT(1, req->rc);
2188 goto error;
2189 }
2190 P9_DPRINTK(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2191 "proc_id %d client_id %s\n", glock->type, glock->start,
2192 glock->length, glock->proc_id, glock->client_id);
2193 error:
2194 p9_free_req(clnt, req);
2195 return err;
2196 }
2197 EXPORT_SYMBOL(p9_client_getlock_dotl);
2198
2199 int p9_client_readlink(struct p9_fid *fid, char **target)
2200 {
2201 int err;
2202 struct p9_client *clnt;
2203 struct p9_req_t *req;
2204
2205 err = 0;
2206 clnt = fid->clnt;
2207 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2208
2209 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2210 if (IS_ERR(req))
2211 return PTR_ERR(req);
2212
2213 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2214 if (err) {
2215 P9_DUMP_PKT(1, req->rc);
2216 goto error;
2217 }
2218 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2219 error:
2220 p9_free_req(clnt, req);
2221 return err;
2222 }
2223 EXPORT_SYMBOL(p9_client_readlink);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree