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ARM: 7409/1: Do not call flush_cache_user_range with mmap_sem held
[linux/fpc-iii.git] / net / 9p / client.c
blob5532710fbfe9396e81d89b6531cfd7ba415b2396
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(const substring_t *name)
76 {
77 int version = -EINVAL;
78
79 if (!strncmp("9p2000", name->from, name->to-name->from)) {
80 version = p9_proto_legacy;
81 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: Legacy\n");
82 } else if (!strncmp("9p2000.u", name->from, name->to-name->from)) {
83 version = p9_proto_2000u;
84 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
85 } else if (!strncmp("9p2000.L", name->from, name->to-name->from)) {
86 version = p9_proto_2000L;
87 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
88 } else {
89 P9_DPRINTK(P9_DEBUG_ERROR, "Unknown protocol version %s. ",
90 name->from);
91 }
92 return version;
93 }
94
95 /**
96 * parse_options - parse mount options into client structure
97 * @opts: options string passed from mount
98 * @clnt: existing v9fs client information
99 *
100 * Return 0 upon success, -ERRNO upon failure
101 */
102
103 static int parse_opts(char *opts, struct p9_client *clnt)
104 {
105 char *options, *tmp_options;
106 char *p;
107 substring_t args[MAX_OPT_ARGS];
108 int option;
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 clnt->trans_mod = v9fs_get_trans_by_name(&args[0]);
145 if(clnt->trans_mod == NULL) {
146 P9_DPRINTK(P9_DEBUG_ERROR,
147 "Could not find request transport: %s\n",
148 (char *) &args[0]);
149 ret = -EINVAL;
150 goto free_and_return;
151 }
152 break;
153 case Opt_legacy:
154 clnt->proto_version = p9_proto_legacy;
155 break;
156 case Opt_version:
157 ret = get_protocol_version(&args[0]);
158 if (ret == -EINVAL)
159 goto free_and_return;
160 clnt->proto_version = ret;
161 break;
162 default:
163 continue;
164 }
165 }
166
167 free_and_return:
168 kfree(tmp_options);
169 return ret;
170 }
171
172 /**
173 * p9_tag_alloc - lookup/allocate a request by tag
174 * @c: client session to lookup tag within
175 * @tag: numeric id for transaction
176 *
177 * this is a simple array lookup, but will grow the
178 * request_slots as necessary to accommodate transaction
179 * ids which did not previously have a slot.
180 *
181 * this code relies on the client spinlock to manage locks, its
182 * possible we should switch to something else, but I'd rather
183 * stick with something low-overhead for the common case.
184 *
185 */
186
187 static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag)
188 {
189 unsigned long flags;
190 int row, col;
191 struct p9_req_t *req;
192
193 /* This looks up the original request by tag so we know which
194 * buffer to read the data into */
195 tag++;
196
197 if (tag >= c->max_tag) {
198 spin_lock_irqsave(&c->lock, flags);
199 /* check again since original check was outside of lock */
200 while (tag >= c->max_tag) {
201 row = (tag / P9_ROW_MAXTAG);
202 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
203 sizeof(struct p9_req_t), GFP_ATOMIC);
204
205 if (!c->reqs[row]) {
206 printk(KERN_ERR "Couldn't grow tag array\n");
207 spin_unlock_irqrestore(&c->lock, flags);
208 return ERR_PTR(-ENOMEM);
209 }
210 for (col = 0; col < P9_ROW_MAXTAG; col++) {
211 c->reqs[row][col].status = REQ_STATUS_IDLE;
212 c->reqs[row][col].tc = NULL;
213 }
214 c->max_tag += P9_ROW_MAXTAG;
215 }
216 spin_unlock_irqrestore(&c->lock, flags);
217 }
218 row = tag / P9_ROW_MAXTAG;
219 col = tag % P9_ROW_MAXTAG;
220
221 req = &c->reqs[row][col];
222 if (!req->tc) {
223 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
224 if (!req->wq) {
225 printk(KERN_ERR "Couldn't grow tag array\n");
226 return ERR_PTR(-ENOMEM);
227 }
228 init_waitqueue_head(req->wq);
229 if ((c->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
230 P9_TRANS_PREF_PAYLOAD_SEP) {
231 int alloc_msize = min(c->msize, 4096);
232 req->tc = kmalloc(sizeof(struct p9_fcall)+alloc_msize,
233 GFP_NOFS);
234 req->tc->capacity = alloc_msize;
235 req->rc = kmalloc(sizeof(struct p9_fcall)+alloc_msize,
236 GFP_NOFS);
237 req->rc->capacity = alloc_msize;
238 } else {
239 req->tc = kmalloc(sizeof(struct p9_fcall)+c->msize,
240 GFP_NOFS);
241 req->tc->capacity = c->msize;
242 req->rc = kmalloc(sizeof(struct p9_fcall)+c->msize,
243 GFP_NOFS);
244 req->rc->capacity = c->msize;
245 }
246 if ((!req->tc) || (!req->rc)) {
247 printk(KERN_ERR "Couldn't grow tag array\n");
248 kfree(req->tc);
249 kfree(req->rc);
250 kfree(req->wq);
251 req->tc = req->rc = NULL;
252 req->wq = NULL;
253 return ERR_PTR(-ENOMEM);
254 }
255 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
256 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
257 }
258
259 p9pdu_reset(req->tc);
260 p9pdu_reset(req->rc);
261
262 req->tc->tag = tag-1;
263 req->status = REQ_STATUS_ALLOC;
264
265 return &c->reqs[row][col];
266 }
267
268 /**
269 * p9_tag_lookup - lookup a request by tag
270 * @c: client session to lookup tag within
271 * @tag: numeric id for transaction
272 *
273 */
274
275 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
276 {
277 int row, col;
278
279 /* This looks up the original request by tag so we know which
280 * buffer to read the data into */
281 tag++;
282
283 if(tag >= c->max_tag)
284 return NULL;
285
286 row = tag / P9_ROW_MAXTAG;
287 col = tag % P9_ROW_MAXTAG;
288
289 return &c->reqs[row][col];
290 }
291 EXPORT_SYMBOL(p9_tag_lookup);
292
293 /**
294 * p9_tag_init - setup tags structure and contents
295 * @c: v9fs client struct
296 *
297 * This initializes the tags structure for each client instance.
298 *
299 */
300
301 static int p9_tag_init(struct p9_client *c)
302 {
303 int err = 0;
304
305 c->tagpool = p9_idpool_create();
306 if (IS_ERR(c->tagpool)) {
307 err = PTR_ERR(c->tagpool);
308 goto error;
309 }
310 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
311 if (err < 0) {
312 p9_idpool_destroy(c->tagpool);
313 goto error;
314 }
315 c->max_tag = 0;
316 error:
317 return err;
318 }
319
320 /**
321 * p9_tag_cleanup - cleans up tags structure and reclaims resources
322 * @c: v9fs client struct
323 *
324 * This frees resources associated with the tags structure
325 *
326 */
327 static void p9_tag_cleanup(struct p9_client *c)
328 {
329 int row, col;
330
331 /* check to insure all requests are idle */
332 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
333 for (col = 0; col < P9_ROW_MAXTAG; col++) {
334 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
335 P9_DPRINTK(P9_DEBUG_MUX,
336 "Attempting to cleanup non-free tag %d,%d\n",
337 row, col);
338 /* TODO: delay execution of cleanup */
339 return;
340 }
341 }
342 }
343
344 if (c->tagpool) {
345 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
346 p9_idpool_destroy(c->tagpool);
347 }
348
349 /* free requests associated with tags */
350 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
351 for (col = 0; col < P9_ROW_MAXTAG; col++) {
352 kfree(c->reqs[row][col].wq);
353 kfree(c->reqs[row][col].tc);
354 kfree(c->reqs[row][col].rc);
355 }
356 kfree(c->reqs[row]);
357 }
358 c->max_tag = 0;
359 }
360
361 /**
362 * p9_free_req - free a request and clean-up as necessary
363 * c: client state
364 * r: request to release
365 *
366 */
367
368 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
369 {
370 int tag = r->tc->tag;
371 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
372
373 r->status = REQ_STATUS_IDLE;
374 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
375 p9_idpool_put(tag, c->tagpool);
376 }
377
378 /**
379 * p9_client_cb - call back from transport to client
380 * c: client state
381 * req: request received
382 *
383 */
384 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
385 {
386 P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
387 wake_up(req->wq);
388 P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
389 }
390 EXPORT_SYMBOL(p9_client_cb);
391
392 /**
393 * p9_parse_header - parse header arguments out of a packet
394 * @pdu: packet to parse
395 * @size: size of packet
396 * @type: type of request
397 * @tag: tag of packet
398 * @rewind: set if we need to rewind offset afterwards
399 */
400
401 int
402 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
403 int rewind)
404 {
405 int8_t r_type;
406 int16_t r_tag;
407 int32_t r_size;
408 int offset = pdu->offset;
409 int err;
410
411 pdu->offset = 0;
412 if (pdu->size == 0)
413 pdu->size = 7;
414
415 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
416 if (err)
417 goto rewind_and_exit;
418
419 pdu->size = r_size;
420 pdu->id = r_type;
421 pdu->tag = r_tag;
422
423 P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size,
424 pdu->id, pdu->tag);
425
426 if (type)
427 *type = r_type;
428 if (tag)
429 *tag = r_tag;
430 if (size)
431 *size = r_size;
432
433
434 rewind_and_exit:
435 if (rewind)
436 pdu->offset = offset;
437 return err;
438 }
439 EXPORT_SYMBOL(p9_parse_header);
440
441 /**
442 * p9_check_errors - check 9p packet for error return and process it
443 * @c: current client instance
444 * @req: request to parse and check for error conditions
445 *
446 * returns error code if one is discovered, otherwise returns 0
447 *
448 * this will have to be more complicated if we have multiple
449 * error packet types
450 */
451
452 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
453 {
454 int8_t type;
455 int err;
456 int ecode;
457
458 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
459 if (err) {
460 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
461 return err;
462 }
463
464 if (type != P9_RERROR && type != P9_RLERROR)
465 return 0;
466
467 if (!p9_is_proto_dotl(c)) {
468 char *ename;
469
470 if (req->tc->pbuf_size) {
471 /* Handle user buffers */
472 size_t len = req->rc->size - req->rc->offset;
473 if (req->tc->pubuf) {
474 /* User Buffer */
475 err = copy_from_user(
476 &req->rc->sdata[req->rc->offset],
477 req->tc->pubuf, len);
478 if (err) {
479 err = -EFAULT;
480 goto out_err;
481 }
482 } else {
483 /* Kernel Buffer */
484 memmove(&req->rc->sdata[req->rc->offset],
485 req->tc->pkbuf, len);
486 }
487 }
488 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
489 &ename, &ecode);
490 if (err)
491 goto out_err;
492
493 if (p9_is_proto_dotu(c))
494 err = -ecode;
495
496 if (!err || !IS_ERR_VALUE(err)) {
497 err = p9_errstr2errno(ename, strlen(ename));
498
499 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode,
500 ename);
501
502 kfree(ename);
503 }
504 } else {
505 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
506 err = -ecode;
507
508 P9_DPRINTK(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
509 }
510
511
512 return err;
513
514 out_err:
515 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
516
517 return err;
518 }
519
520 static struct p9_req_t *
521 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
522
523 /**
524 * p9_client_flush - flush (cancel) a request
525 * @c: client state
526 * @oldreq: request to cancel
527 *
528 * This sents a flush for a particular request and links
529 * the flush request to the original request. The current
530 * code only supports a single flush request although the protocol
531 * allows for multiple flush requests to be sent for a single request.
532 *
533 */
534
535 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
536 {
537 struct p9_req_t *req;
538 int16_t oldtag;
539 int err;
540
541 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
542 if (err)
543 return err;
544
545 P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
546
547 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
548 if (IS_ERR(req))
549 return PTR_ERR(req);
550
551
552 /* if we haven't received a response for oldreq,
553 remove it from the list. */
554 spin_lock(&c->lock);
555 if (oldreq->status == REQ_STATUS_FLSH)
556 list_del(&oldreq->req_list);
557 spin_unlock(&c->lock);
558
559 p9_free_req(c, req);
560 return 0;
561 }
562
563 /**
564 * p9_client_rpc - issue a request and wait for a response
565 * @c: client session
566 * @type: type of request
567 * @fmt: protocol format string (see protocol.c)
568 *
569 * Returns request structure (which client must free using p9_free_req)
570 */
571
572 static struct p9_req_t *
573 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
574 {
575 va_list ap;
576 int tag, err;
577 struct p9_req_t *req;
578 unsigned long flags;
579 int sigpending;
580
581 P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
582
583 /* we allow for any status other than disconnected */
584 if (c->status == Disconnected)
585 return ERR_PTR(-EIO);
586
587 /* if status is begin_disconnected we allow only clunk request */
588 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
589 return ERR_PTR(-EIO);
590
591 if (signal_pending(current)) {
592 sigpending = 1;
593 clear_thread_flag(TIF_SIGPENDING);
594 } else
595 sigpending = 0;
596
597 tag = P9_NOTAG;
598 if (type != P9_TVERSION) {
599 tag = p9_idpool_get(c->tagpool);
600 if (tag < 0)
601 return ERR_PTR(-ENOMEM);
602 }
603
604 req = p9_tag_alloc(c, tag);
605 if (IS_ERR(req))
606 return req;
607
608 /* marshall the data */
609 p9pdu_prepare(req->tc, tag, type);
610 va_start(ap, fmt);
611 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
612 va_end(ap);
613 if (err)
614 goto reterr;
615 p9pdu_finalize(req->tc);
616
617 err = c->trans_mod->request(c, req);
618 if (err < 0) {
619 if (err != -ERESTARTSYS && err != -EFAULT)
620 c->status = Disconnected;
621 goto reterr;
622 }
623
624 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag);
625 err = wait_event_interruptible(*req->wq,
626 req->status >= REQ_STATUS_RCVD);
627 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n",
628 req->wq, tag, err);
629
630 if (req->status == REQ_STATUS_ERROR) {
631 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
632 err = req->t_err;
633 }
634
635 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
636 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
637 sigpending = 1;
638 clear_thread_flag(TIF_SIGPENDING);
639
640 if (c->trans_mod->cancel(c, req))
641 p9_client_flush(c, req);
642
643 /* if we received the response anyway, don't signal error */
644 if (req->status == REQ_STATUS_RCVD)
645 err = 0;
646 }
647
648 if (sigpending) {
649 spin_lock_irqsave(&current->sighand->siglock, flags);
650 recalc_sigpending();
651 spin_unlock_irqrestore(&current->sighand->siglock, flags);
652 }
653
654 if (err < 0)
655 goto reterr;
656
657 err = p9_check_errors(c, req);
658 if (!err) {
659 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
660 return req;
661 }
662
663 reterr:
664 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
665 err);
666 p9_free_req(c, req);
667 return ERR_PTR(err);
668 }
669
670 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
671 {
672 int ret;
673 struct p9_fid *fid;
674 unsigned long flags;
675
676 P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
677 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
678 if (!fid)
679 return ERR_PTR(-ENOMEM);
680
681 ret = p9_idpool_get(clnt->fidpool);
682 if (ret < 0) {
683 ret = -ENOSPC;
684 goto error;
685 }
686 fid->fid = ret;
687
688 memset(&fid->qid, 0, sizeof(struct p9_qid));
689 fid->mode = -1;
690 fid->uid = current_fsuid();
691 fid->clnt = clnt;
692 fid->rdir = NULL;
693 spin_lock_irqsave(&clnt->lock, flags);
694 list_add(&fid->flist, &clnt->fidlist);
695 spin_unlock_irqrestore(&clnt->lock, flags);
696
697 return fid;
698
699 error:
700 kfree(fid);
701 return ERR_PTR(ret);
702 }
703
704 static void p9_fid_destroy(struct p9_fid *fid)
705 {
706 struct p9_client *clnt;
707 unsigned long flags;
708
709 P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
710 clnt = fid->clnt;
711 p9_idpool_put(fid->fid, clnt->fidpool);
712 spin_lock_irqsave(&clnt->lock, flags);
713 list_del(&fid->flist);
714 spin_unlock_irqrestore(&clnt->lock, flags);
715 kfree(fid->rdir);
716 kfree(fid);
717 }
718
719 static int p9_client_version(struct p9_client *c)
720 {
721 int err = 0;
722 struct p9_req_t *req;
723 char *version;
724 int msize;
725
726 P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
727 c->msize, c->proto_version);
728
729 switch (c->proto_version) {
730 case p9_proto_2000L:
731 req = p9_client_rpc(c, P9_TVERSION, "ds",
732 c->msize, "9P2000.L");
733 break;
734 case p9_proto_2000u:
735 req = p9_client_rpc(c, P9_TVERSION, "ds",
736 c->msize, "9P2000.u");
737 break;
738 case p9_proto_legacy:
739 req = p9_client_rpc(c, P9_TVERSION, "ds",
740 c->msize, "9P2000");
741 break;
742 default:
743 return -EINVAL;
744 break;
745 }
746
747 if (IS_ERR(req))
748 return PTR_ERR(req);
749
750 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
751 if (err) {
752 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
753 p9pdu_dump(1, req->rc);
754 goto error;
755 }
756
757 P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
758 if (!strncmp(version, "9P2000.L", 8))
759 c->proto_version = p9_proto_2000L;
760 else if (!strncmp(version, "9P2000.u", 8))
761 c->proto_version = p9_proto_2000u;
762 else if (!strncmp(version, "9P2000", 6))
763 c->proto_version = p9_proto_legacy;
764 else {
765 err = -EREMOTEIO;
766 goto error;
767 }
768
769 if (msize < c->msize)
770 c->msize = msize;
771
772 error:
773 kfree(version);
774 p9_free_req(c, req);
775
776 return err;
777 }
778
779 struct p9_client *p9_client_create(const char *dev_name, char *options)
780 {
781 int err;
782 struct p9_client *clnt;
783
784 err = 0;
785 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
786 if (!clnt)
787 return ERR_PTR(-ENOMEM);
788
789 clnt->trans_mod = NULL;
790 clnt->trans = NULL;
791 spin_lock_init(&clnt->lock);
792 INIT_LIST_HEAD(&clnt->fidlist);
793
794 err = p9_tag_init(clnt);
795 if (err < 0)
796 goto free_client;
797
798 err = parse_opts(options, clnt);
799 if (err < 0)
800 goto destroy_tagpool;
801
802 if (!clnt->trans_mod)
803 clnt->trans_mod = v9fs_get_default_trans();
804
805 if (clnt->trans_mod == NULL) {
806 err = -EPROTONOSUPPORT;
807 P9_DPRINTK(P9_DEBUG_ERROR,
808 "No transport defined or default transport\n");
809 goto destroy_tagpool;
810 }
811
812 clnt->fidpool = p9_idpool_create();
813 if (IS_ERR(clnt->fidpool)) {
814 err = PTR_ERR(clnt->fidpool);
815 goto put_trans;
816 }
817
818 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
819 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
820
821 err = clnt->trans_mod->create(clnt, dev_name, options);
822 if (err)
823 goto destroy_fidpool;
824
825 if (clnt->msize > clnt->trans_mod->maxsize)
826 clnt->msize = clnt->trans_mod->maxsize;
827
828 err = p9_client_version(clnt);
829 if (err)
830 goto close_trans;
831
832 return clnt;
833
834 close_trans:
835 clnt->trans_mod->close(clnt);
836 destroy_fidpool:
837 p9_idpool_destroy(clnt->fidpool);
838 put_trans:
839 v9fs_put_trans(clnt->trans_mod);
840 destroy_tagpool:
841 p9_idpool_destroy(clnt->tagpool);
842 free_client:
843 kfree(clnt);
844 return ERR_PTR(err);
845 }
846 EXPORT_SYMBOL(p9_client_create);
847
848 void p9_client_destroy(struct p9_client *clnt)
849 {
850 struct p9_fid *fid, *fidptr;
851
852 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt);
853
854 if (clnt->trans_mod)
855 clnt->trans_mod->close(clnt);
856
857 v9fs_put_trans(clnt->trans_mod);
858
859 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
860 printk(KERN_INFO "Found fid %d not clunked\n", fid->fid);
861 p9_fid_destroy(fid);
862 }
863
864 if (clnt->fidpool)
865 p9_idpool_destroy(clnt->fidpool);
866
867 p9_tag_cleanup(clnt);
868
869 kfree(clnt);
870 }
871 EXPORT_SYMBOL(p9_client_destroy);
872
873 void p9_client_disconnect(struct p9_client *clnt)
874 {
875 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
876 clnt->status = Disconnected;
877 }
878 EXPORT_SYMBOL(p9_client_disconnect);
879
880 void p9_client_begin_disconnect(struct p9_client *clnt)
881 {
882 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
883 clnt->status = BeginDisconnect;
884 }
885 EXPORT_SYMBOL(p9_client_begin_disconnect);
886
887 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
888 char *uname, u32 n_uname, char *aname)
889 {
890 int err;
891 struct p9_req_t *req;
892 struct p9_fid *fid;
893 struct p9_qid qid;
894
895 P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
896 afid ? afid->fid : -1, uname, aname);
897 err = 0;
898
899 fid = p9_fid_create(clnt);
900 if (IS_ERR(fid)) {
901 err = PTR_ERR(fid);
902 fid = NULL;
903 goto error;
904 }
905
906 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
907 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
908 if (IS_ERR(req)) {
909 err = PTR_ERR(req);
910 goto error;
911 }
912
913 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
914 if (err) {
915 p9pdu_dump(1, req->rc);
916 p9_free_req(clnt, req);
917 goto error;
918 }
919
920 P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
921 qid.type,
922 (unsigned long long)qid.path,
923 qid.version);
924
925 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
926
927 p9_free_req(clnt, req);
928 return fid;
929
930 error:
931 if (fid)
932 p9_fid_destroy(fid);
933 return ERR_PTR(err);
934 }
935 EXPORT_SYMBOL(p9_client_attach);
936
937 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
938 char **wnames, int clone)
939 {
940 int err;
941 struct p9_client *clnt;
942 struct p9_fid *fid;
943 struct p9_qid *wqids;
944 struct p9_req_t *req;
945 uint16_t nwqids, count;
946
947 err = 0;
948 wqids = NULL;
949 clnt = oldfid->clnt;
950 if (clone) {
951 fid = p9_fid_create(clnt);
952 if (IS_ERR(fid)) {
953 err = PTR_ERR(fid);
954 fid = NULL;
955 goto error;
956 }
957
958 fid->uid = oldfid->uid;
959 } else
960 fid = oldfid;
961
962
963 P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
964 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
965
966 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
967 nwname, wnames);
968 if (IS_ERR(req)) {
969 err = PTR_ERR(req);
970 goto error;
971 }
972
973 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
974 if (err) {
975 p9pdu_dump(1, req->rc);
976 p9_free_req(clnt, req);
977 goto clunk_fid;
978 }
979 p9_free_req(clnt, req);
980
981 P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
982
983 if (nwqids != nwname) {
984 err = -ENOENT;
985 goto clunk_fid;
986 }
987
988 for (count = 0; count < nwqids; count++)
989 P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
990 count, wqids[count].type,
991 (unsigned long long)wqids[count].path,
992 wqids[count].version);
993
994 if (nwname)
995 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
996 else
997 fid->qid = oldfid->qid;
998
999 kfree(wqids);
1000 return fid;
1001
1002 clunk_fid:
1003 kfree(wqids);
1004 p9_client_clunk(fid);
1005 fid = NULL;
1006
1007 error:
1008 if (fid && (fid != oldfid))
1009 p9_fid_destroy(fid);
1010
1011 return ERR_PTR(err);
1012 }
1013 EXPORT_SYMBOL(p9_client_walk);
1014
1015 int p9_client_open(struct p9_fid *fid, int mode)
1016 {
1017 int err;
1018 struct p9_client *clnt;
1019 struct p9_req_t *req;
1020 struct p9_qid qid;
1021 int iounit;
1022
1023 clnt = fid->clnt;
1024 P9_DPRINTK(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1025 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1026 err = 0;
1027
1028 if (fid->mode != -1)
1029 return -EINVAL;
1030
1031 if (p9_is_proto_dotl(clnt))
1032 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1033 else
1034 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1035 if (IS_ERR(req)) {
1036 err = PTR_ERR(req);
1037 goto error;
1038 }
1039
1040 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1041 if (err) {
1042 p9pdu_dump(1, req->rc);
1043 goto free_and_error;
1044 }
1045
1046 P9_DPRINTK(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1047 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1048 (unsigned long long)qid.path, qid.version, iounit);
1049
1050 fid->mode = mode;
1051 fid->iounit = iounit;
1052
1053 free_and_error:
1054 p9_free_req(clnt, req);
1055 error:
1056 return err;
1057 }
1058 EXPORT_SYMBOL(p9_client_open);
1059
1060 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1061 gid_t gid, struct p9_qid *qid)
1062 {
1063 int err = 0;
1064 struct p9_client *clnt;
1065 struct p9_req_t *req;
1066 int iounit;
1067
1068 P9_DPRINTK(P9_DEBUG_9P,
1069 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1070 ofid->fid, name, flags, mode, gid);
1071 clnt = ofid->clnt;
1072
1073 if (ofid->mode != -1)
1074 return -EINVAL;
1075
1076 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags,
1077 mode, gid);
1078 if (IS_ERR(req)) {
1079 err = PTR_ERR(req);
1080 goto error;
1081 }
1082
1083 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1084 if (err) {
1085 p9pdu_dump(1, req->rc);
1086 goto free_and_error;
1087 }
1088
1089 P9_DPRINTK(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1090 qid->type,
1091 (unsigned long long)qid->path,
1092 qid->version, iounit);
1093
1094 ofid->mode = mode;
1095 ofid->iounit = iounit;
1096
1097 free_and_error:
1098 p9_free_req(clnt, req);
1099 error:
1100 return err;
1101 }
1102 EXPORT_SYMBOL(p9_client_create_dotl);
1103
1104 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1105 char *extension)
1106 {
1107 int err;
1108 struct p9_client *clnt;
1109 struct p9_req_t *req;
1110 struct p9_qid qid;
1111 int iounit;
1112
1113 P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1114 fid->fid, name, perm, mode);
1115 err = 0;
1116 clnt = fid->clnt;
1117
1118 if (fid->mode != -1)
1119 return -EINVAL;
1120
1121 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1122 mode, extension);
1123 if (IS_ERR(req)) {
1124 err = PTR_ERR(req);
1125 goto error;
1126 }
1127
1128 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1129 if (err) {
1130 p9pdu_dump(1, req->rc);
1131 goto free_and_error;
1132 }
1133
1134 P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1135 qid.type,
1136 (unsigned long long)qid.path,
1137 qid.version, iounit);
1138
1139 fid->mode = mode;
1140 fid->iounit = iounit;
1141
1142 free_and_error:
1143 p9_free_req(clnt, req);
1144 error:
1145 return err;
1146 }
1147 EXPORT_SYMBOL(p9_client_fcreate);
1148
1149 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid,
1150 struct p9_qid *qid)
1151 {
1152 int err = 0;
1153 struct p9_client *clnt;
1154 struct p9_req_t *req;
1155
1156 P9_DPRINTK(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1157 dfid->fid, name, symtgt);
1158 clnt = dfid->clnt;
1159
1160 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt,
1161 gid);
1162 if (IS_ERR(req)) {
1163 err = PTR_ERR(req);
1164 goto error;
1165 }
1166
1167 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1168 if (err) {
1169 p9pdu_dump(1, req->rc);
1170 goto free_and_error;
1171 }
1172
1173 P9_DPRINTK(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1174 qid->type, (unsigned long long)qid->path, qid->version);
1175
1176 free_and_error:
1177 p9_free_req(clnt, req);
1178 error:
1179 return err;
1180 }
1181 EXPORT_SYMBOL(p9_client_symlink);
1182
1183 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1184 {
1185 struct p9_client *clnt;
1186 struct p9_req_t *req;
1187
1188 P9_DPRINTK(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1189 dfid->fid, oldfid->fid, newname);
1190 clnt = dfid->clnt;
1191 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1192 newname);
1193 if (IS_ERR(req))
1194 return PTR_ERR(req);
1195
1196 P9_DPRINTK(P9_DEBUG_9P, "<<< RLINK\n");
1197 p9_free_req(clnt, req);
1198 return 0;
1199 }
1200 EXPORT_SYMBOL(p9_client_link);
1201
1202 int p9_client_fsync(struct p9_fid *fid, int datasync)
1203 {
1204 int err;
1205 struct p9_client *clnt;
1206 struct p9_req_t *req;
1207
1208 P9_DPRINTK(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1209 fid->fid, datasync);
1210 err = 0;
1211 clnt = fid->clnt;
1212
1213 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1214 if (IS_ERR(req)) {
1215 err = PTR_ERR(req);
1216 goto error;
1217 }
1218
1219 P9_DPRINTK(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1220
1221 p9_free_req(clnt, req);
1222
1223 error:
1224 return err;
1225 }
1226 EXPORT_SYMBOL(p9_client_fsync);
1227
1228 int p9_client_clunk(struct p9_fid *fid)
1229 {
1230 int err;
1231 struct p9_client *clnt;
1232 struct p9_req_t *req;
1233
1234 if (!fid) {
1235 P9_EPRINTK(KERN_WARNING, "Trying to clunk with NULL fid\n");
1236 dump_stack();
1237 return 0;
1238 }
1239
1240 P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
1241 err = 0;
1242 clnt = fid->clnt;
1243
1244 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1245 if (IS_ERR(req)) {
1246 err = PTR_ERR(req);
1247 goto error;
1248 }
1249
1250 P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1251
1252 p9_free_req(clnt, req);
1253 error:
1254 /*
1255 * Fid is not valid even after a failed clunk
1256 */
1257 p9_fid_destroy(fid);
1258 return err;
1259 }
1260 EXPORT_SYMBOL(p9_client_clunk);
1261
1262 int p9_client_remove(struct p9_fid *fid)
1263 {
1264 int err;
1265 struct p9_client *clnt;
1266 struct p9_req_t *req;
1267
1268 P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1269 err = 0;
1270 clnt = fid->clnt;
1271
1272 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1273 if (IS_ERR(req)) {
1274 err = PTR_ERR(req);
1275 goto error;
1276 }
1277
1278 P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1279
1280 p9_free_req(clnt, req);
1281 error:
1282 p9_fid_destroy(fid);
1283 return err;
1284 }
1285 EXPORT_SYMBOL(p9_client_remove);
1286
1287 int
1288 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1289 u32 count)
1290 {
1291 int err, rsize;
1292 struct p9_client *clnt;
1293 struct p9_req_t *req;
1294 char *dataptr;
1295
1296 P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid,
1297 (long long unsigned) offset, count);
1298 err = 0;
1299 clnt = fid->clnt;
1300
1301 rsize = fid->iounit;
1302 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1303 rsize = clnt->msize - P9_IOHDRSZ;
1304
1305 if (count < rsize)
1306 rsize = count;
1307
1308 /* Don't bother zerocopy for small IO (< 1024) */
1309 if (((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
1310 P9_TRANS_PREF_PAYLOAD_SEP) && (rsize > 1024)) {
1311 req = p9_client_rpc(clnt, P9_TREAD, "dqE", fid->fid, offset,
1312 rsize, data, udata);
1313 } else {
1314 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1315 rsize);
1316 }
1317 if (IS_ERR(req)) {
1318 err = PTR_ERR(req);
1319 goto error;
1320 }
1321
1322 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1323 if (err) {
1324 p9pdu_dump(1, req->rc);
1325 goto free_and_error;
1326 }
1327
1328 P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1329
1330 if (!req->tc->pbuf_size) {
1331 if (data) {
1332 memmove(data, dataptr, count);
1333 } else {
1334 err = copy_to_user(udata, dataptr, count);
1335 if (err) {
1336 err = -EFAULT;
1337 goto free_and_error;
1338 }
1339 }
1340 }
1341 p9_free_req(clnt, req);
1342 return count;
1343
1344 free_and_error:
1345 p9_free_req(clnt, req);
1346 error:
1347 return err;
1348 }
1349 EXPORT_SYMBOL(p9_client_read);
1350
1351 int
1352 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1353 u64 offset, u32 count)
1354 {
1355 int err, rsize;
1356 struct p9_client *clnt;
1357 struct p9_req_t *req;
1358
1359 P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1360 fid->fid, (long long unsigned) offset, count);
1361 err = 0;
1362 clnt = fid->clnt;
1363
1364 rsize = fid->iounit;
1365 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1366 rsize = clnt->msize - P9_IOHDRSZ;
1367
1368 if (count < rsize)
1369 rsize = count;
1370
1371 /* Don't bother zerocopy form small IO (< 1024) */
1372 if (((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
1373 P9_TRANS_PREF_PAYLOAD_SEP) && (rsize > 1024)) {
1374 req = p9_client_rpc(clnt, P9_TWRITE, "dqE", fid->fid, offset,
1375 rsize, data, udata);
1376 } else {
1377
1378 if (data)
1379 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
1380 offset, rsize, data);
1381 else
1382 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
1383 offset, rsize, udata);
1384 }
1385 if (IS_ERR(req)) {
1386 err = PTR_ERR(req);
1387 goto error;
1388 }
1389
1390 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1391 if (err) {
1392 p9pdu_dump(1, req->rc);
1393 goto free_and_error;
1394 }
1395
1396 P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1397
1398 p9_free_req(clnt, req);
1399 return count;
1400
1401 free_and_error:
1402 p9_free_req(clnt, req);
1403 error:
1404 return err;
1405 }
1406 EXPORT_SYMBOL(p9_client_write);
1407
1408 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1409 {
1410 int err;
1411 struct p9_client *clnt;
1412 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1413 struct p9_req_t *req;
1414 u16 ignored;
1415
1416 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1417
1418 if (!ret)
1419 return ERR_PTR(-ENOMEM);
1420
1421 err = 0;
1422 clnt = fid->clnt;
1423
1424 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1425 if (IS_ERR(req)) {
1426 err = PTR_ERR(req);
1427 goto error;
1428 }
1429
1430 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1431 if (err) {
1432 p9pdu_dump(1, req->rc);
1433 p9_free_req(clnt, req);
1434 goto error;
1435 }
1436
1437 P9_DPRINTK(P9_DEBUG_9P,
1438 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1439 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1440 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1441 "<<< uid=%d gid=%d n_muid=%d\n",
1442 ret->size, ret->type, ret->dev, ret->qid.type,
1443 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1444 ret->atime, ret->mtime, (unsigned long long)ret->length,
1445 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1446 ret->n_uid, ret->n_gid, ret->n_muid);
1447
1448 p9_free_req(clnt, req);
1449 return ret;
1450
1451 error:
1452 kfree(ret);
1453 return ERR_PTR(err);
1454 }
1455 EXPORT_SYMBOL(p9_client_stat);
1456
1457 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1458 u64 request_mask)
1459 {
1460 int err;
1461 struct p9_client *clnt;
1462 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1463 GFP_KERNEL);
1464 struct p9_req_t *req;
1465
1466 P9_DPRINTK(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1467 fid->fid, request_mask);
1468
1469 if (!ret)
1470 return ERR_PTR(-ENOMEM);
1471
1472 err = 0;
1473 clnt = fid->clnt;
1474
1475 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1476 if (IS_ERR(req)) {
1477 err = PTR_ERR(req);
1478 goto error;
1479 }
1480
1481 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1482 if (err) {
1483 p9pdu_dump(1, req->rc);
1484 p9_free_req(clnt, req);
1485 goto error;
1486 }
1487
1488 P9_DPRINTK(P9_DEBUG_9P,
1489 "<<< RGETATTR st_result_mask=%lld\n"
1490 "<<< qid=%x.%llx.%x\n"
1491 "<<< st_mode=%8.8x st_nlink=%llu\n"
1492 "<<< st_uid=%d st_gid=%d\n"
1493 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1494 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1495 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1496 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1497 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1498 "<<< st_gen=%lld st_data_version=%lld",
1499 ret->st_result_mask, ret->qid.type, ret->qid.path,
1500 ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid,
1501 ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize,
1502 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1503 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1504 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1505 ret->st_gen, ret->st_data_version);
1506
1507 p9_free_req(clnt, req);
1508 return ret;
1509
1510 error:
1511 kfree(ret);
1512 return ERR_PTR(err);
1513 }
1514 EXPORT_SYMBOL(p9_client_getattr_dotl);
1515
1516 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1517 {
1518 int ret;
1519
1520 /* NOTE: size shouldn't include its own length */
1521 /* size[2] type[2] dev[4] qid[13] */
1522 /* mode[4] atime[4] mtime[4] length[8]*/
1523 /* name[s] uid[s] gid[s] muid[s] */
1524 ret = 2+4+13+4+4+4+8+2+2+2+2;
1525
1526 if (wst->name)
1527 ret += strlen(wst->name);
1528 if (wst->uid)
1529 ret += strlen(wst->uid);
1530 if (wst->gid)
1531 ret += strlen(wst->gid);
1532 if (wst->muid)
1533 ret += strlen(wst->muid);
1534
1535 if ((proto_version == p9_proto_2000u) ||
1536 (proto_version == p9_proto_2000L)) {
1537 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1538 if (wst->extension)
1539 ret += strlen(wst->extension);
1540 }
1541
1542 return ret;
1543 }
1544
1545 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1546 {
1547 int err;
1548 struct p9_req_t *req;
1549 struct p9_client *clnt;
1550
1551 err = 0;
1552 clnt = fid->clnt;
1553 wst->size = p9_client_statsize(wst, clnt->proto_version);
1554 P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1555 P9_DPRINTK(P9_DEBUG_9P,
1556 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1557 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1558 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1559 " uid=%d gid=%d n_muid=%d\n",
1560 wst->size, wst->type, wst->dev, wst->qid.type,
1561 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1562 wst->atime, wst->mtime, (unsigned long long)wst->length,
1563 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1564 wst->n_uid, wst->n_gid, wst->n_muid);
1565
1566 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1567 if (IS_ERR(req)) {
1568 err = PTR_ERR(req);
1569 goto error;
1570 }
1571
1572 P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1573
1574 p9_free_req(clnt, req);
1575 error:
1576 return err;
1577 }
1578 EXPORT_SYMBOL(p9_client_wstat);
1579
1580 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1581 {
1582 int err;
1583 struct p9_req_t *req;
1584 struct p9_client *clnt;
1585
1586 err = 0;
1587 clnt = fid->clnt;
1588 P9_DPRINTK(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1589 P9_DPRINTK(P9_DEBUG_9P,
1590 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1591 " atime_sec=%lld atime_nsec=%lld\n"
1592 " mtime_sec=%lld mtime_nsec=%lld\n",
1593 p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid,
1594 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1595 p9attr->mtime_sec, p9attr->mtime_nsec);
1596
1597 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1598
1599 if (IS_ERR(req)) {
1600 err = PTR_ERR(req);
1601 goto error;
1602 }
1603 P9_DPRINTK(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1604 p9_free_req(clnt, req);
1605 error:
1606 return err;
1607 }
1608 EXPORT_SYMBOL(p9_client_setattr);
1609
1610 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1611 {
1612 int err;
1613 struct p9_req_t *req;
1614 struct p9_client *clnt;
1615
1616 err = 0;
1617 clnt = fid->clnt;
1618
1619 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1620
1621 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1622 if (IS_ERR(req)) {
1623 err = PTR_ERR(req);
1624 goto error;
1625 }
1626
1627 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1628 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1629 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1630 if (err) {
1631 p9pdu_dump(1, req->rc);
1632 p9_free_req(clnt, req);
1633 goto error;
1634 }
1635
1636 P9_DPRINTK(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1637 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1638 "fsid %llu namelen %ld\n",
1639 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1640 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1641 sb->fsid, (long int)sb->namelen);
1642
1643 p9_free_req(clnt, req);
1644 error:
1645 return err;
1646 }
1647 EXPORT_SYMBOL(p9_client_statfs);
1648
1649 int p9_client_rename(struct p9_fid *fid, struct p9_fid *newdirfid, char *name)
1650 {
1651 int err;
1652 struct p9_req_t *req;
1653 struct p9_client *clnt;
1654
1655 err = 0;
1656 clnt = fid->clnt;
1657
1658 P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1659 fid->fid, newdirfid->fid, name);
1660
1661 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1662 newdirfid->fid, name);
1663 if (IS_ERR(req)) {
1664 err = PTR_ERR(req);
1665 goto error;
1666 }
1667
1668 P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1669
1670 p9_free_req(clnt, req);
1671 error:
1672 return err;
1673 }
1674 EXPORT_SYMBOL(p9_client_rename);
1675
1676 /*
1677 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1678 */
1679 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1680 const char *attr_name, u64 *attr_size)
1681 {
1682 int err;
1683 struct p9_req_t *req;
1684 struct p9_client *clnt;
1685 struct p9_fid *attr_fid;
1686
1687 err = 0;
1688 clnt = file_fid->clnt;
1689 attr_fid = p9_fid_create(clnt);
1690 if (IS_ERR(attr_fid)) {
1691 err = PTR_ERR(attr_fid);
1692 attr_fid = NULL;
1693 goto error;
1694 }
1695 P9_DPRINTK(P9_DEBUG_9P,
1696 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
1697 file_fid->fid, attr_fid->fid, attr_name);
1698
1699 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
1700 file_fid->fid, attr_fid->fid, attr_name);
1701 if (IS_ERR(req)) {
1702 err = PTR_ERR(req);
1703 goto error;
1704 }
1705 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
1706 if (err) {
1707 p9pdu_dump(1, req->rc);
1708 p9_free_req(clnt, req);
1709 goto clunk_fid;
1710 }
1711 p9_free_req(clnt, req);
1712 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
1713 attr_fid->fid, *attr_size);
1714 return attr_fid;
1715 clunk_fid:
1716 p9_client_clunk(attr_fid);
1717 attr_fid = NULL;
1718 error:
1719 if (attr_fid && (attr_fid != file_fid))
1720 p9_fid_destroy(attr_fid);
1721
1722 return ERR_PTR(err);
1723 }
1724 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
1725
1726 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
1727 u64 attr_size, int flags)
1728 {
1729 int err;
1730 struct p9_req_t *req;
1731 struct p9_client *clnt;
1732
1733 P9_DPRINTK(P9_DEBUG_9P,
1734 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
1735 fid->fid, name, (long long)attr_size, flags);
1736 err = 0;
1737 clnt = fid->clnt;
1738 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
1739 fid->fid, name, attr_size, flags);
1740 if (IS_ERR(req)) {
1741 err = PTR_ERR(req);
1742 goto error;
1743 }
1744 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
1745 p9_free_req(clnt, req);
1746 error:
1747 return err;
1748 }
1749 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
1750
1751 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
1752 {
1753 int err, rsize;
1754 struct p9_client *clnt;
1755 struct p9_req_t *req;
1756 char *dataptr;
1757
1758 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
1759 fid->fid, (long long unsigned) offset, count);
1760
1761 err = 0;
1762 clnt = fid->clnt;
1763
1764 rsize = fid->iounit;
1765 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
1766 rsize = clnt->msize - P9_READDIRHDRSZ;
1767
1768 if (count < rsize)
1769 rsize = count;
1770
1771 if ((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
1772 P9_TRANS_PREF_PAYLOAD_SEP) {
1773 req = p9_client_rpc(clnt, P9_TREADDIR, "dqF", fid->fid,
1774 offset, rsize, data);
1775 } else {
1776 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
1777 offset, rsize);
1778 }
1779 if (IS_ERR(req)) {
1780 err = PTR_ERR(req);
1781 goto error;
1782 }
1783
1784 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1785 if (err) {
1786 p9pdu_dump(1, req->rc);
1787 goto free_and_error;
1788 }
1789
1790 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
1791
1792 if (!req->tc->pbuf_size && data)
1793 memmove(data, dataptr, count);
1794
1795 p9_free_req(clnt, req);
1796 return count;
1797
1798 free_and_error:
1799 p9_free_req(clnt, req);
1800 error:
1801 return err;
1802 }
1803 EXPORT_SYMBOL(p9_client_readdir);
1804
1805 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
1806 dev_t rdev, gid_t gid, struct p9_qid *qid)
1807 {
1808 int err;
1809 struct p9_client *clnt;
1810 struct p9_req_t *req;
1811
1812 err = 0;
1813 clnt = fid->clnt;
1814 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
1815 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
1816 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode,
1817 MAJOR(rdev), MINOR(rdev), gid);
1818 if (IS_ERR(req))
1819 return PTR_ERR(req);
1820
1821 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1822 if (err) {
1823 p9pdu_dump(1, req->rc);
1824 goto error;
1825 }
1826 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
1827 (unsigned long long)qid->path, qid->version);
1828
1829 error:
1830 p9_free_req(clnt, req);
1831 return err;
1832
1833 }
1834 EXPORT_SYMBOL(p9_client_mknod_dotl);
1835
1836 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
1837 gid_t gid, struct p9_qid *qid)
1838 {
1839 int err;
1840 struct p9_client *clnt;
1841 struct p9_req_t *req;
1842
1843 err = 0;
1844 clnt = fid->clnt;
1845 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
1846 fid->fid, name, mode, gid);
1847 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode,
1848 gid);
1849 if (IS_ERR(req))
1850 return PTR_ERR(req);
1851
1852 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1853 if (err) {
1854 p9pdu_dump(1, req->rc);
1855 goto error;
1856 }
1857 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
1858 (unsigned long long)qid->path, qid->version);
1859
1860 error:
1861 p9_free_req(clnt, req);
1862 return err;
1863
1864 }
1865 EXPORT_SYMBOL(p9_client_mkdir_dotl);
1866
1867 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
1868 {
1869 int err;
1870 struct p9_client *clnt;
1871 struct p9_req_t *req;
1872
1873 err = 0;
1874 clnt = fid->clnt;
1875 P9_DPRINTK(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
1876 "start %lld length %lld proc_id %d client_id %s\n",
1877 fid->fid, flock->type, flock->flags, flock->start,
1878 flock->length, flock->proc_id, flock->client_id);
1879
1880 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
1881 flock->flags, flock->start, flock->length,
1882 flock->proc_id, flock->client_id);
1883
1884 if (IS_ERR(req))
1885 return PTR_ERR(req);
1886
1887 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
1888 if (err) {
1889 p9pdu_dump(1, req->rc);
1890 goto error;
1891 }
1892 P9_DPRINTK(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
1893 error:
1894 p9_free_req(clnt, req);
1895 return err;
1896
1897 }
1898 EXPORT_SYMBOL(p9_client_lock_dotl);
1899
1900 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
1901 {
1902 int err;
1903 struct p9_client *clnt;
1904 struct p9_req_t *req;
1905
1906 err = 0;
1907 clnt = fid->clnt;
1908 P9_DPRINTK(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
1909 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
1910 glock->start, glock->length, glock->proc_id, glock->client_id);
1911
1912 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
1913 glock->start, glock->length, glock->proc_id, glock->client_id);
1914
1915 if (IS_ERR(req))
1916 return PTR_ERR(req);
1917
1918 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
1919 &glock->start, &glock->length, &glock->proc_id,
1920 &glock->client_id);
1921 if (err) {
1922 p9pdu_dump(1, req->rc);
1923 goto error;
1924 }
1925 P9_DPRINTK(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
1926 "proc_id %d client_id %s\n", glock->type, glock->start,
1927 glock->length, glock->proc_id, glock->client_id);
1928 error:
1929 p9_free_req(clnt, req);
1930 return err;
1931 }
1932 EXPORT_SYMBOL(p9_client_getlock_dotl);
1933
1934 int p9_client_readlink(struct p9_fid *fid, char **target)
1935 {
1936 int err;
1937 struct p9_client *clnt;
1938 struct p9_req_t *req;
1939
1940 err = 0;
1941 clnt = fid->clnt;
1942 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
1943
1944 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
1945 if (IS_ERR(req))
1946 return PTR_ERR(req);
1947
1948 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
1949 if (err) {
1950 p9pdu_dump(1, req->rc);
1951 goto error;
1952 }
1953 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
1954 error:
1955 p9_free_req(clnt, req);
1956 return err;
1957 }
1958 EXPORT_SYMBOL(p9_client_readlink);
Linux with added FPC-III support