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Add linux-next specific files for 20110817
[linux-2.6/next.git] / net / 9p / client.c
blob0505a03c374c1599cac7bffbf1ec6d0af311910e
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)
207 {
208 unsigned long flags;
209 int row, col;
210 struct p9_req_t *req;
211
212 /* This looks up the original request by tag so we know which
213 * buffer to read the data into */
214 tag++;
215
216 if (tag >= c->max_tag) {
217 spin_lock_irqsave(&c->lock, flags);
218 /* check again since original check was outside of lock */
219 while (tag >= c->max_tag) {
220 row = (tag / P9_ROW_MAXTAG);
221 c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
222 sizeof(struct p9_req_t), GFP_ATOMIC);
223
224 if (!c->reqs[row]) {
225 printk(KERN_ERR "Couldn't grow tag array\n");
226 spin_unlock_irqrestore(&c->lock, flags);
227 return ERR_PTR(-ENOMEM);
228 }
229 for (col = 0; col < P9_ROW_MAXTAG; col++) {
230 c->reqs[row][col].status = REQ_STATUS_IDLE;
231 c->reqs[row][col].tc = NULL;
232 }
233 c->max_tag += P9_ROW_MAXTAG;
234 }
235 spin_unlock_irqrestore(&c->lock, flags);
236 }
237 row = tag / P9_ROW_MAXTAG;
238 col = tag % P9_ROW_MAXTAG;
239
240 req = &c->reqs[row][col];
241 if (!req->tc) {
242 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
243 if (!req->wq) {
244 printk(KERN_ERR "Couldn't grow tag array\n");
245 return ERR_PTR(-ENOMEM);
246 }
247 init_waitqueue_head(req->wq);
248 if ((c->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
249 P9_TRANS_PREF_PAYLOAD_SEP) {
250 int alloc_msize = min(c->msize, 4096);
251 req->tc = kmalloc(sizeof(struct p9_fcall)+alloc_msize,
252 GFP_NOFS);
253 req->tc->capacity = alloc_msize;
254 req->rc = kmalloc(sizeof(struct p9_fcall)+alloc_msize,
255 GFP_NOFS);
256 req->rc->capacity = alloc_msize;
257 } else {
258 req->tc = kmalloc(sizeof(struct p9_fcall)+c->msize,
259 GFP_NOFS);
260 req->tc->capacity = c->msize;
261 req->rc = kmalloc(sizeof(struct p9_fcall)+c->msize,
262 GFP_NOFS);
263 req->rc->capacity = c->msize;
264 }
265 if ((!req->tc) || (!req->rc)) {
266 printk(KERN_ERR "Couldn't grow tag array\n");
267 kfree(req->tc);
268 kfree(req->rc);
269 kfree(req->wq);
270 req->tc = req->rc = NULL;
271 req->wq = NULL;
272 return ERR_PTR(-ENOMEM);
273 }
274 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
275 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
276 }
277
278 p9pdu_reset(req->tc);
279 p9pdu_reset(req->rc);
280
281 req->tc->tag = tag-1;
282 req->status = REQ_STATUS_ALLOC;
283
284 return &c->reqs[row][col];
285 }
286
287 /**
288 * p9_tag_lookup - lookup a request by tag
289 * @c: client session to lookup tag within
290 * @tag: numeric id for transaction
291 *
292 */
293
294 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
295 {
296 int row, col;
297
298 /* This looks up the original request by tag so we know which
299 * buffer to read the data into */
300 tag++;
301
302 if(tag >= c->max_tag)
303 return NULL;
304
305 row = tag / P9_ROW_MAXTAG;
306 col = tag % P9_ROW_MAXTAG;
307
308 return &c->reqs[row][col];
309 }
310 EXPORT_SYMBOL(p9_tag_lookup);
311
312 /**
313 * p9_tag_init - setup tags structure and contents
314 * @c: v9fs client struct
315 *
316 * This initializes the tags structure for each client instance.
317 *
318 */
319
320 static int p9_tag_init(struct p9_client *c)
321 {
322 int err = 0;
323
324 c->tagpool = p9_idpool_create();
325 if (IS_ERR(c->tagpool)) {
326 err = PTR_ERR(c->tagpool);
327 goto error;
328 }
329 err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
330 if (err < 0) {
331 p9_idpool_destroy(c->tagpool);
332 goto error;
333 }
334 c->max_tag = 0;
335 error:
336 return err;
337 }
338
339 /**
340 * p9_tag_cleanup - cleans up tags structure and reclaims resources
341 * @c: v9fs client struct
342 *
343 * This frees resources associated with the tags structure
344 *
345 */
346 static void p9_tag_cleanup(struct p9_client *c)
347 {
348 int row, col;
349
350 /* check to insure all requests are idle */
351 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
352 for (col = 0; col < P9_ROW_MAXTAG; col++) {
353 if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
354 P9_DPRINTK(P9_DEBUG_MUX,
355 "Attempting to cleanup non-free tag %d,%d\n",
356 row, col);
357 /* TODO: delay execution of cleanup */
358 return;
359 }
360 }
361 }
362
363 if (c->tagpool) {
364 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
365 p9_idpool_destroy(c->tagpool);
366 }
367
368 /* free requests associated with tags */
369 for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
370 for (col = 0; col < P9_ROW_MAXTAG; col++) {
371 kfree(c->reqs[row][col].wq);
372 kfree(c->reqs[row][col].tc);
373 kfree(c->reqs[row][col].rc);
374 }
375 kfree(c->reqs[row]);
376 }
377 c->max_tag = 0;
378 }
379
380 /**
381 * p9_free_req - free a request and clean-up as necessary
382 * c: client state
383 * r: request to release
384 *
385 */
386
387 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
388 {
389 int tag = r->tc->tag;
390 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
391
392 r->status = REQ_STATUS_IDLE;
393 if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
394 p9_idpool_put(tag, c->tagpool);
395 }
396
397 /**
398 * p9_client_cb - call back from transport to client
399 * c: client state
400 * req: request received
401 *
402 */
403 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
404 {
405 P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
406 wake_up(req->wq);
407 P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
408 }
409 EXPORT_SYMBOL(p9_client_cb);
410
411 /**
412 * p9_parse_header - parse header arguments out of a packet
413 * @pdu: packet to parse
414 * @size: size of packet
415 * @type: type of request
416 * @tag: tag of packet
417 * @rewind: set if we need to rewind offset afterwards
418 */
419
420 int
421 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
422 int rewind)
423 {
424 int8_t r_type;
425 int16_t r_tag;
426 int32_t r_size;
427 int offset = pdu->offset;
428 int err;
429
430 pdu->offset = 0;
431 if (pdu->size == 0)
432 pdu->size = 7;
433
434 err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
435 if (err)
436 goto rewind_and_exit;
437
438 pdu->size = r_size;
439 pdu->id = r_type;
440 pdu->tag = r_tag;
441
442 P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size,
443 pdu->id, pdu->tag);
444
445 if (type)
446 *type = r_type;
447 if (tag)
448 *tag = r_tag;
449 if (size)
450 *size = r_size;
451
452
453 rewind_and_exit:
454 if (rewind)
455 pdu->offset = offset;
456 return err;
457 }
458 EXPORT_SYMBOL(p9_parse_header);
459
460 /**
461 * p9_check_errors - check 9p packet for error return and process it
462 * @c: current client instance
463 * @req: request to parse and check for error conditions
464 *
465 * returns error code if one is discovered, otherwise returns 0
466 *
467 * this will have to be more complicated if we have multiple
468 * error packet types
469 */
470
471 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
472 {
473 int8_t type;
474 int err;
475 int ecode;
476
477 err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
478 if (err) {
479 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
480 return err;
481 }
482
483 if (type != P9_RERROR && type != P9_RLERROR)
484 return 0;
485
486 if (!p9_is_proto_dotl(c)) {
487 char *ename;
488
489 if (req->tc->pbuf_size) {
490 /* Handle user buffers */
491 size_t len = req->rc->size - req->rc->offset;
492 if (req->tc->pubuf) {
493 /* User Buffer */
494 err = copy_from_user(
495 &req->rc->sdata[req->rc->offset],
496 req->tc->pubuf, len);
497 if (err) {
498 err = -EFAULT;
499 goto out_err;
500 }
501 } else {
502 /* Kernel Buffer */
503 memmove(&req->rc->sdata[req->rc->offset],
504 req->tc->pkbuf, len);
505 }
506 }
507 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
508 &ename, &ecode);
509 if (err)
510 goto out_err;
511
512 if (p9_is_proto_dotu(c))
513 err = -ecode;
514
515 if (!err || !IS_ERR_VALUE(err)) {
516 err = p9_errstr2errno(ename, strlen(ename));
517
518 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode,
519 ename);
520
521 kfree(ename);
522 }
523 } else {
524 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
525 err = -ecode;
526
527 P9_DPRINTK(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
528 }
529
530
531 return err;
532
533 out_err:
534 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
535
536 return err;
537 }
538
539 static struct p9_req_t *
540 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
541
542 /**
543 * p9_client_flush - flush (cancel) a request
544 * @c: client state
545 * @oldreq: request to cancel
546 *
547 * This sents a flush for a particular request and links
548 * the flush request to the original request. The current
549 * code only supports a single flush request although the protocol
550 * allows for multiple flush requests to be sent for a single request.
551 *
552 */
553
554 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
555 {
556 struct p9_req_t *req;
557 int16_t oldtag;
558 int err;
559
560 err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
561 if (err)
562 return err;
563
564 P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
565
566 req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
567 if (IS_ERR(req))
568 return PTR_ERR(req);
569
570
571 /* if we haven't received a response for oldreq,
572 remove it from the list. */
573 spin_lock(&c->lock);
574 if (oldreq->status == REQ_STATUS_FLSH)
575 list_del(&oldreq->req_list);
576 spin_unlock(&c->lock);
577
578 p9_free_req(c, req);
579 return 0;
580 }
581
582 /**
583 * p9_client_rpc - issue a request and wait for a response
584 * @c: client session
585 * @type: type of request
586 * @fmt: protocol format string (see protocol.c)
587 *
588 * Returns request structure (which client must free using p9_free_req)
589 */
590
591 static struct p9_req_t *
592 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
593 {
594 va_list ap;
595 int tag, err;
596 struct p9_req_t *req;
597 unsigned long flags;
598 int sigpending;
599
600 P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
601
602 /* we allow for any status other than disconnected */
603 if (c->status == Disconnected)
604 return ERR_PTR(-EIO);
605
606 /* if status is begin_disconnected we allow only clunk request */
607 if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
608 return ERR_PTR(-EIO);
609
610 if (signal_pending(current)) {
611 sigpending = 1;
612 clear_thread_flag(TIF_SIGPENDING);
613 } else
614 sigpending = 0;
615
616 tag = P9_NOTAG;
617 if (type != P9_TVERSION) {
618 tag = p9_idpool_get(c->tagpool);
619 if (tag < 0)
620 return ERR_PTR(-ENOMEM);
621 }
622
623 req = p9_tag_alloc(c, tag);
624 if (IS_ERR(req))
625 return req;
626
627 /* marshall the data */
628 p9pdu_prepare(req->tc, tag, type);
629 va_start(ap, fmt);
630 err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
631 va_end(ap);
632 if (err)
633 goto reterr;
634 p9pdu_finalize(req->tc);
635
636 err = c->trans_mod->request(c, req);
637 if (err < 0) {
638 if (err != -ERESTARTSYS && err != -EFAULT)
639 c->status = Disconnected;
640 goto reterr;
641 }
642
643 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag);
644 err = wait_event_interruptible(*req->wq,
645 req->status >= REQ_STATUS_RCVD);
646 P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n",
647 req->wq, tag, err);
648
649 if (req->status == REQ_STATUS_ERROR) {
650 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
651 err = req->t_err;
652 }
653
654 if ((err == -ERESTARTSYS) && (c->status == Connected)) {
655 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
656 sigpending = 1;
657 clear_thread_flag(TIF_SIGPENDING);
658
659 if (c->trans_mod->cancel(c, req))
660 p9_client_flush(c, req);
661
662 /* if we received the response anyway, don't signal error */
663 if (req->status == REQ_STATUS_RCVD)
664 err = 0;
665 }
666
667 if (sigpending) {
668 spin_lock_irqsave(&current->sighand->siglock, flags);
669 recalc_sigpending();
670 spin_unlock_irqrestore(&current->sighand->siglock, flags);
671 }
672
673 if (err < 0)
674 goto reterr;
675
676 err = p9_check_errors(c, req);
677 if (!err) {
678 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
679 return req;
680 }
681
682 reterr:
683 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
684 err);
685 p9_free_req(c, req);
686 return ERR_PTR(err);
687 }
688
689 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
690 {
691 int ret;
692 struct p9_fid *fid;
693 unsigned long flags;
694
695 P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
696 fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
697 if (!fid)
698 return ERR_PTR(-ENOMEM);
699
700 ret = p9_idpool_get(clnt->fidpool);
701 if (ret < 0) {
702 ret = -ENOSPC;
703 goto error;
704 }
705 fid->fid = ret;
706
707 memset(&fid->qid, 0, sizeof(struct p9_qid));
708 fid->mode = -1;
709 fid->uid = current_fsuid();
710 fid->clnt = clnt;
711 fid->rdir = NULL;
712 spin_lock_irqsave(&clnt->lock, flags);
713 list_add(&fid->flist, &clnt->fidlist);
714 spin_unlock_irqrestore(&clnt->lock, flags);
715
716 return fid;
717
718 error:
719 kfree(fid);
720 return ERR_PTR(ret);
721 }
722
723 static void p9_fid_destroy(struct p9_fid *fid)
724 {
725 struct p9_client *clnt;
726 unsigned long flags;
727
728 P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
729 clnt = fid->clnt;
730 p9_idpool_put(fid->fid, clnt->fidpool);
731 spin_lock_irqsave(&clnt->lock, flags);
732 list_del(&fid->flist);
733 spin_unlock_irqrestore(&clnt->lock, flags);
734 kfree(fid->rdir);
735 kfree(fid);
736 }
737
738 static int p9_client_version(struct p9_client *c)
739 {
740 int err = 0;
741 struct p9_req_t *req;
742 char *version;
743 int msize;
744
745 P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
746 c->msize, c->proto_version);
747
748 switch (c->proto_version) {
749 case p9_proto_2000L:
750 req = p9_client_rpc(c, P9_TVERSION, "ds",
751 c->msize, "9P2000.L");
752 break;
753 case p9_proto_2000u:
754 req = p9_client_rpc(c, P9_TVERSION, "ds",
755 c->msize, "9P2000.u");
756 break;
757 case p9_proto_legacy:
758 req = p9_client_rpc(c, P9_TVERSION, "ds",
759 c->msize, "9P2000");
760 break;
761 default:
762 return -EINVAL;
763 break;
764 }
765
766 if (IS_ERR(req))
767 return PTR_ERR(req);
768
769 err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
770 if (err) {
771 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
772 P9_DUMP_PKT(1, req->rc);
773 goto error;
774 }
775
776 P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
777 if (!strncmp(version, "9P2000.L", 8))
778 c->proto_version = p9_proto_2000L;
779 else if (!strncmp(version, "9P2000.u", 8))
780 c->proto_version = p9_proto_2000u;
781 else if (!strncmp(version, "9P2000", 6))
782 c->proto_version = p9_proto_legacy;
783 else {
784 err = -EREMOTEIO;
785 goto error;
786 }
787
788 if (msize < c->msize)
789 c->msize = msize;
790
791 error:
792 kfree(version);
793 p9_free_req(c, req);
794
795 return err;
796 }
797
798 struct p9_client *p9_client_create(const char *dev_name, char *options)
799 {
800 int err;
801 struct p9_client *clnt;
802
803 err = 0;
804 clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
805 if (!clnt)
806 return ERR_PTR(-ENOMEM);
807
808 clnt->trans_mod = NULL;
809 clnt->trans = NULL;
810 spin_lock_init(&clnt->lock);
811 INIT_LIST_HEAD(&clnt->fidlist);
812
813 err = p9_tag_init(clnt);
814 if (err < 0)
815 goto free_client;
816
817 err = parse_opts(options, clnt);
818 if (err < 0)
819 goto destroy_tagpool;
820
821 if (!clnt->trans_mod)
822 clnt->trans_mod = v9fs_get_default_trans();
823
824 if (clnt->trans_mod == NULL) {
825 err = -EPROTONOSUPPORT;
826 P9_DPRINTK(P9_DEBUG_ERROR,
827 "No transport defined or default transport\n");
828 goto destroy_tagpool;
829 }
830
831 clnt->fidpool = p9_idpool_create();
832 if (IS_ERR(clnt->fidpool)) {
833 err = PTR_ERR(clnt->fidpool);
834 goto put_trans;
835 }
836
837 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
838 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
839
840 err = clnt->trans_mod->create(clnt, dev_name, options);
841 if (err)
842 goto destroy_fidpool;
843
844 if (clnt->msize > clnt->trans_mod->maxsize)
845 clnt->msize = clnt->trans_mod->maxsize;
846
847 err = p9_client_version(clnt);
848 if (err)
849 goto close_trans;
850
851 return clnt;
852
853 close_trans:
854 clnt->trans_mod->close(clnt);
855 destroy_fidpool:
856 p9_idpool_destroy(clnt->fidpool);
857 put_trans:
858 v9fs_put_trans(clnt->trans_mod);
859 destroy_tagpool:
860 p9_idpool_destroy(clnt->tagpool);
861 free_client:
862 kfree(clnt);
863 return ERR_PTR(err);
864 }
865 EXPORT_SYMBOL(p9_client_create);
866
867 void p9_client_destroy(struct p9_client *clnt)
868 {
869 struct p9_fid *fid, *fidptr;
870
871 P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt);
872
873 if (clnt->trans_mod)
874 clnt->trans_mod->close(clnt);
875
876 v9fs_put_trans(clnt->trans_mod);
877
878 list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
879 printk(KERN_INFO "Found fid %d not clunked\n", fid->fid);
880 p9_fid_destroy(fid);
881 }
882
883 if (clnt->fidpool)
884 p9_idpool_destroy(clnt->fidpool);
885
886 p9_tag_cleanup(clnt);
887
888 kfree(clnt);
889 }
890 EXPORT_SYMBOL(p9_client_destroy);
891
892 void p9_client_disconnect(struct p9_client *clnt)
893 {
894 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
895 clnt->status = Disconnected;
896 }
897 EXPORT_SYMBOL(p9_client_disconnect);
898
899 void p9_client_begin_disconnect(struct p9_client *clnt)
900 {
901 P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
902 clnt->status = BeginDisconnect;
903 }
904 EXPORT_SYMBOL(p9_client_begin_disconnect);
905
906 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
907 char *uname, u32 n_uname, char *aname)
908 {
909 int err;
910 struct p9_req_t *req;
911 struct p9_fid *fid;
912 struct p9_qid qid;
913
914 P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
915 afid ? afid->fid : -1, uname, aname);
916 err = 0;
917
918 fid = p9_fid_create(clnt);
919 if (IS_ERR(fid)) {
920 err = PTR_ERR(fid);
921 fid = NULL;
922 goto error;
923 }
924
925 req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
926 afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
927 if (IS_ERR(req)) {
928 err = PTR_ERR(req);
929 goto error;
930 }
931
932 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
933 if (err) {
934 P9_DUMP_PKT(1, req->rc);
935 p9_free_req(clnt, req);
936 goto error;
937 }
938
939 P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
940 qid.type,
941 (unsigned long long)qid.path,
942 qid.version);
943
944 memmove(&fid->qid, &qid, sizeof(struct p9_qid));
945
946 p9_free_req(clnt, req);
947 return fid;
948
949 error:
950 if (fid)
951 p9_fid_destroy(fid);
952 return ERR_PTR(err);
953 }
954 EXPORT_SYMBOL(p9_client_attach);
955
956 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
957 char **wnames, int clone)
958 {
959 int err;
960 struct p9_client *clnt;
961 struct p9_fid *fid;
962 struct p9_qid *wqids;
963 struct p9_req_t *req;
964 uint16_t nwqids, count;
965
966 err = 0;
967 wqids = NULL;
968 clnt = oldfid->clnt;
969 if (clone) {
970 fid = p9_fid_create(clnt);
971 if (IS_ERR(fid)) {
972 err = PTR_ERR(fid);
973 fid = NULL;
974 goto error;
975 }
976
977 fid->uid = oldfid->uid;
978 } else
979 fid = oldfid;
980
981
982 P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
983 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
984
985 req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
986 nwname, wnames);
987 if (IS_ERR(req)) {
988 err = PTR_ERR(req);
989 goto error;
990 }
991
992 err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
993 if (err) {
994 P9_DUMP_PKT(1, req->rc);
995 p9_free_req(clnt, req);
996 goto clunk_fid;
997 }
998 p9_free_req(clnt, req);
999
1000 P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
1001
1002 if (nwqids != nwname) {
1003 err = -ENOENT;
1004 goto clunk_fid;
1005 }
1006
1007 for (count = 0; count < nwqids; count++)
1008 P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n",
1009 count, wqids[count].type,
1010 (unsigned long long)wqids[count].path,
1011 wqids[count].version);
1012
1013 if (nwname)
1014 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
1015 else
1016 fid->qid = oldfid->qid;
1017
1018 kfree(wqids);
1019 return fid;
1020
1021 clunk_fid:
1022 kfree(wqids);
1023 p9_client_clunk(fid);
1024 fid = NULL;
1025
1026 error:
1027 if (fid && (fid != oldfid))
1028 p9_fid_destroy(fid);
1029
1030 return ERR_PTR(err);
1031 }
1032 EXPORT_SYMBOL(p9_client_walk);
1033
1034 int p9_client_open(struct p9_fid *fid, int mode)
1035 {
1036 int err;
1037 struct p9_client *clnt;
1038 struct p9_req_t *req;
1039 struct p9_qid qid;
1040 int iounit;
1041
1042 clnt = fid->clnt;
1043 P9_DPRINTK(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1044 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1045 err = 0;
1046
1047 if (fid->mode != -1)
1048 return -EINVAL;
1049
1050 if (p9_is_proto_dotl(clnt))
1051 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1052 else
1053 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1054 if (IS_ERR(req)) {
1055 err = PTR_ERR(req);
1056 goto error;
1057 }
1058
1059 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1060 if (err) {
1061 P9_DUMP_PKT(1, req->rc);
1062 goto free_and_error;
1063 }
1064
1065 P9_DPRINTK(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1066 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type,
1067 (unsigned long long)qid.path, qid.version, iounit);
1068
1069 fid->mode = mode;
1070 fid->iounit = iounit;
1071
1072 free_and_error:
1073 p9_free_req(clnt, req);
1074 error:
1075 return err;
1076 }
1077 EXPORT_SYMBOL(p9_client_open);
1078
1079 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1080 gid_t gid, struct p9_qid *qid)
1081 {
1082 int err = 0;
1083 struct p9_client *clnt;
1084 struct p9_req_t *req;
1085 int iounit;
1086
1087 P9_DPRINTK(P9_DEBUG_9P,
1088 ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1089 ofid->fid, name, flags, mode, gid);
1090 clnt = ofid->clnt;
1091
1092 if (ofid->mode != -1)
1093 return -EINVAL;
1094
1095 req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags,
1096 mode, gid);
1097 if (IS_ERR(req)) {
1098 err = PTR_ERR(req);
1099 goto error;
1100 }
1101
1102 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1103 if (err) {
1104 P9_DUMP_PKT(1, req->rc);
1105 goto free_and_error;
1106 }
1107
1108 P9_DPRINTK(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1109 qid->type,
1110 (unsigned long long)qid->path,
1111 qid->version, iounit);
1112
1113 ofid->mode = mode;
1114 ofid->iounit = iounit;
1115
1116 free_and_error:
1117 p9_free_req(clnt, req);
1118 error:
1119 return err;
1120 }
1121 EXPORT_SYMBOL(p9_client_create_dotl);
1122
1123 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1124 char *extension)
1125 {
1126 int err;
1127 struct p9_client *clnt;
1128 struct p9_req_t *req;
1129 struct p9_qid qid;
1130 int iounit;
1131
1132 P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1133 fid->fid, name, perm, mode);
1134 err = 0;
1135 clnt = fid->clnt;
1136
1137 if (fid->mode != -1)
1138 return -EINVAL;
1139
1140 req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1141 mode, extension);
1142 if (IS_ERR(req)) {
1143 err = PTR_ERR(req);
1144 goto error;
1145 }
1146
1147 err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1148 if (err) {
1149 P9_DUMP_PKT(1, req->rc);
1150 goto free_and_error;
1151 }
1152
1153 P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1154 qid.type,
1155 (unsigned long long)qid.path,
1156 qid.version, iounit);
1157
1158 fid->mode = mode;
1159 fid->iounit = iounit;
1160
1161 free_and_error:
1162 p9_free_req(clnt, req);
1163 error:
1164 return err;
1165 }
1166 EXPORT_SYMBOL(p9_client_fcreate);
1167
1168 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid,
1169 struct p9_qid *qid)
1170 {
1171 int err = 0;
1172 struct p9_client *clnt;
1173 struct p9_req_t *req;
1174
1175 P9_DPRINTK(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n",
1176 dfid->fid, name, symtgt);
1177 clnt = dfid->clnt;
1178
1179 req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt,
1180 gid);
1181 if (IS_ERR(req)) {
1182 err = PTR_ERR(req);
1183 goto error;
1184 }
1185
1186 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1187 if (err) {
1188 P9_DUMP_PKT(1, req->rc);
1189 goto free_and_error;
1190 }
1191
1192 P9_DPRINTK(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1193 qid->type, (unsigned long long)qid->path, qid->version);
1194
1195 free_and_error:
1196 p9_free_req(clnt, req);
1197 error:
1198 return err;
1199 }
1200 EXPORT_SYMBOL(p9_client_symlink);
1201
1202 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1203 {
1204 struct p9_client *clnt;
1205 struct p9_req_t *req;
1206
1207 P9_DPRINTK(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1208 dfid->fid, oldfid->fid, newname);
1209 clnt = dfid->clnt;
1210 req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1211 newname);
1212 if (IS_ERR(req))
1213 return PTR_ERR(req);
1214
1215 P9_DPRINTK(P9_DEBUG_9P, "<<< RLINK\n");
1216 p9_free_req(clnt, req);
1217 return 0;
1218 }
1219 EXPORT_SYMBOL(p9_client_link);
1220
1221 int p9_client_fsync(struct p9_fid *fid, int datasync)
1222 {
1223 int err;
1224 struct p9_client *clnt;
1225 struct p9_req_t *req;
1226
1227 P9_DPRINTK(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1228 fid->fid, datasync);
1229 err = 0;
1230 clnt = fid->clnt;
1231
1232 req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1233 if (IS_ERR(req)) {
1234 err = PTR_ERR(req);
1235 goto error;
1236 }
1237
1238 P9_DPRINTK(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1239
1240 p9_free_req(clnt, req);
1241
1242 error:
1243 return err;
1244 }
1245 EXPORT_SYMBOL(p9_client_fsync);
1246
1247 int p9_client_clunk(struct p9_fid *fid)
1248 {
1249 int err;
1250 struct p9_client *clnt;
1251 struct p9_req_t *req;
1252
1253 if (!fid) {
1254 P9_EPRINTK(KERN_WARNING, "Trying to clunk with NULL fid\n");
1255 dump_stack();
1256 return 0;
1257 }
1258
1259 P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
1260 err = 0;
1261 clnt = fid->clnt;
1262
1263 req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1264 if (IS_ERR(req)) {
1265 err = PTR_ERR(req);
1266 goto error;
1267 }
1268
1269 P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1270
1271 p9_free_req(clnt, req);
1272 error:
1273 /*
1274 * Fid is not valid even after a failed clunk
1275 */
1276 p9_fid_destroy(fid);
1277 return err;
1278 }
1279 EXPORT_SYMBOL(p9_client_clunk);
1280
1281 int p9_client_remove(struct p9_fid *fid)
1282 {
1283 int err;
1284 struct p9_client *clnt;
1285 struct p9_req_t *req;
1286
1287 P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1288 err = 0;
1289 clnt = fid->clnt;
1290
1291 req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1292 if (IS_ERR(req)) {
1293 err = PTR_ERR(req);
1294 goto error;
1295 }
1296
1297 P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1298
1299 p9_free_req(clnt, req);
1300 error:
1301 p9_fid_destroy(fid);
1302 return err;
1303 }
1304 EXPORT_SYMBOL(p9_client_remove);
1305
1306 int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags)
1307 {
1308 int err = 0;
1309 struct p9_req_t *req;
1310 struct p9_client *clnt;
1311
1312 P9_DPRINTK(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n",
1313 dfid->fid, name, flags);
1314
1315 clnt = dfid->clnt;
1316 req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags);
1317 if (IS_ERR(req)) {
1318 err = PTR_ERR(req);
1319 goto error;
1320 }
1321 P9_DPRINTK(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name);
1322
1323 p9_free_req(clnt, req);
1324 error:
1325 return err;
1326 }
1327 EXPORT_SYMBOL(p9_client_unlinkat);
1328
1329 int
1330 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1331 u32 count)
1332 {
1333 int err, rsize;
1334 struct p9_client *clnt;
1335 struct p9_req_t *req;
1336 char *dataptr;
1337
1338 P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid,
1339 (long long unsigned) offset, count);
1340 err = 0;
1341 clnt = fid->clnt;
1342
1343 rsize = fid->iounit;
1344 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1345 rsize = clnt->msize - P9_IOHDRSZ;
1346
1347 if (count < rsize)
1348 rsize = count;
1349
1350 /* Don't bother zerocopy for small IO (< 1024) */
1351 if (((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
1352 P9_TRANS_PREF_PAYLOAD_SEP) && (rsize > 1024)) {
1353 req = p9_client_rpc(clnt, P9_TREAD, "dqE", fid->fid, offset,
1354 rsize, data, udata);
1355 } else {
1356 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1357 rsize);
1358 }
1359 if (IS_ERR(req)) {
1360 err = PTR_ERR(req);
1361 goto error;
1362 }
1363
1364 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1365 if (err) {
1366 P9_DUMP_PKT(1, req->rc);
1367 goto free_and_error;
1368 }
1369
1370 P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1371 P9_DUMP_PKT(1, req->rc);
1372
1373 if (!req->tc->pbuf_size) {
1374 if (data) {
1375 memmove(data, dataptr, count);
1376 } else {
1377 err = copy_to_user(udata, dataptr, count);
1378 if (err) {
1379 err = -EFAULT;
1380 goto free_and_error;
1381 }
1382 }
1383 }
1384 p9_free_req(clnt, req);
1385 return count;
1386
1387 free_and_error:
1388 p9_free_req(clnt, req);
1389 error:
1390 return err;
1391 }
1392 EXPORT_SYMBOL(p9_client_read);
1393
1394 int
1395 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1396 u64 offset, u32 count)
1397 {
1398 int err, rsize;
1399 struct p9_client *clnt;
1400 struct p9_req_t *req;
1401
1402 P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1403 fid->fid, (long long unsigned) offset, count);
1404 err = 0;
1405 clnt = fid->clnt;
1406
1407 rsize = fid->iounit;
1408 if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1409 rsize = clnt->msize - P9_IOHDRSZ;
1410
1411 if (count < rsize)
1412 rsize = count;
1413
1414 /* Don't bother zerocopy form small IO (< 1024) */
1415 if (((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
1416 P9_TRANS_PREF_PAYLOAD_SEP) && (rsize > 1024)) {
1417 req = p9_client_rpc(clnt, P9_TWRITE, "dqE", fid->fid, offset,
1418 rsize, data, udata);
1419 } else {
1420
1421 if (data)
1422 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
1423 offset, rsize, data);
1424 else
1425 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
1426 offset, rsize, udata);
1427 }
1428 if (IS_ERR(req)) {
1429 err = PTR_ERR(req);
1430 goto error;
1431 }
1432
1433 err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1434 if (err) {
1435 P9_DUMP_PKT(1, req->rc);
1436 goto free_and_error;
1437 }
1438
1439 P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1440
1441 p9_free_req(clnt, req);
1442 return count;
1443
1444 free_and_error:
1445 p9_free_req(clnt, req);
1446 error:
1447 return err;
1448 }
1449 EXPORT_SYMBOL(p9_client_write);
1450
1451 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1452 {
1453 int err;
1454 struct p9_client *clnt;
1455 struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1456 struct p9_req_t *req;
1457 u16 ignored;
1458
1459 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1460
1461 if (!ret)
1462 return ERR_PTR(-ENOMEM);
1463
1464 err = 0;
1465 clnt = fid->clnt;
1466
1467 req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1468 if (IS_ERR(req)) {
1469 err = PTR_ERR(req);
1470 goto error;
1471 }
1472
1473 err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1474 if (err) {
1475 P9_DUMP_PKT(1, req->rc);
1476 p9_free_req(clnt, req);
1477 goto error;
1478 }
1479
1480 P9_DPRINTK(P9_DEBUG_9P,
1481 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1482 "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1483 "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1484 "<<< uid=%d gid=%d n_muid=%d\n",
1485 ret->size, ret->type, ret->dev, ret->qid.type,
1486 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1487 ret->atime, ret->mtime, (unsigned long long)ret->length,
1488 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1489 ret->n_uid, ret->n_gid, ret->n_muid);
1490
1491 p9_free_req(clnt, req);
1492 return ret;
1493
1494 error:
1495 kfree(ret);
1496 return ERR_PTR(err);
1497 }
1498 EXPORT_SYMBOL(p9_client_stat);
1499
1500 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1501 u64 request_mask)
1502 {
1503 int err;
1504 struct p9_client *clnt;
1505 struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1506 GFP_KERNEL);
1507 struct p9_req_t *req;
1508
1509 P9_DPRINTK(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1510 fid->fid, request_mask);
1511
1512 if (!ret)
1513 return ERR_PTR(-ENOMEM);
1514
1515 err = 0;
1516 clnt = fid->clnt;
1517
1518 req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1519 if (IS_ERR(req)) {
1520 err = PTR_ERR(req);
1521 goto error;
1522 }
1523
1524 err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1525 if (err) {
1526 P9_DUMP_PKT(1, req->rc);
1527 p9_free_req(clnt, req);
1528 goto error;
1529 }
1530
1531 P9_DPRINTK(P9_DEBUG_9P,
1532 "<<< RGETATTR st_result_mask=%lld\n"
1533 "<<< qid=%x.%llx.%x\n"
1534 "<<< st_mode=%8.8x st_nlink=%llu\n"
1535 "<<< st_uid=%d st_gid=%d\n"
1536 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1537 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1538 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1539 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1540 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1541 "<<< st_gen=%lld st_data_version=%lld",
1542 ret->st_result_mask, ret->qid.type, ret->qid.path,
1543 ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid,
1544 ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize,
1545 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1546 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1547 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1548 ret->st_gen, ret->st_data_version);
1549
1550 p9_free_req(clnt, req);
1551 return ret;
1552
1553 error:
1554 kfree(ret);
1555 return ERR_PTR(err);
1556 }
1557 EXPORT_SYMBOL(p9_client_getattr_dotl);
1558
1559 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1560 {
1561 int ret;
1562
1563 /* NOTE: size shouldn't include its own length */
1564 /* size[2] type[2] dev[4] qid[13] */
1565 /* mode[4] atime[4] mtime[4] length[8]*/
1566 /* name[s] uid[s] gid[s] muid[s] */
1567 ret = 2+4+13+4+4+4+8+2+2+2+2;
1568
1569 if (wst->name)
1570 ret += strlen(wst->name);
1571 if (wst->uid)
1572 ret += strlen(wst->uid);
1573 if (wst->gid)
1574 ret += strlen(wst->gid);
1575 if (wst->muid)
1576 ret += strlen(wst->muid);
1577
1578 if ((proto_version == p9_proto_2000u) ||
1579 (proto_version == p9_proto_2000L)) {
1580 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1581 if (wst->extension)
1582 ret += strlen(wst->extension);
1583 }
1584
1585 return ret;
1586 }
1587
1588 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1589 {
1590 int err;
1591 struct p9_req_t *req;
1592 struct p9_client *clnt;
1593
1594 err = 0;
1595 clnt = fid->clnt;
1596 wst->size = p9_client_statsize(wst, clnt->proto_version);
1597 P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1598 P9_DPRINTK(P9_DEBUG_9P,
1599 " sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1600 " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1601 " name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1602 " uid=%d gid=%d n_muid=%d\n",
1603 wst->size, wst->type, wst->dev, wst->qid.type,
1604 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1605 wst->atime, wst->mtime, (unsigned long long)wst->length,
1606 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1607 wst->n_uid, wst->n_gid, wst->n_muid);
1608
1609 req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1610 if (IS_ERR(req)) {
1611 err = PTR_ERR(req);
1612 goto error;
1613 }
1614
1615 P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1616
1617 p9_free_req(clnt, req);
1618 error:
1619 return err;
1620 }
1621 EXPORT_SYMBOL(p9_client_wstat);
1622
1623 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1624 {
1625 int err;
1626 struct p9_req_t *req;
1627 struct p9_client *clnt;
1628
1629 err = 0;
1630 clnt = fid->clnt;
1631 P9_DPRINTK(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1632 P9_DPRINTK(P9_DEBUG_9P,
1633 " valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1634 " atime_sec=%lld atime_nsec=%lld\n"
1635 " mtime_sec=%lld mtime_nsec=%lld\n",
1636 p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid,
1637 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1638 p9attr->mtime_sec, p9attr->mtime_nsec);
1639
1640 req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1641
1642 if (IS_ERR(req)) {
1643 err = PTR_ERR(req);
1644 goto error;
1645 }
1646 P9_DPRINTK(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1647 p9_free_req(clnt, req);
1648 error:
1649 return err;
1650 }
1651 EXPORT_SYMBOL(p9_client_setattr);
1652
1653 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1654 {
1655 int err;
1656 struct p9_req_t *req;
1657 struct p9_client *clnt;
1658
1659 err = 0;
1660 clnt = fid->clnt;
1661
1662 P9_DPRINTK(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1663
1664 req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1665 if (IS_ERR(req)) {
1666 err = PTR_ERR(req);
1667 goto error;
1668 }
1669
1670 err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1671 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1672 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1673 if (err) {
1674 P9_DUMP_PKT(1, req->rc);
1675 p9_free_req(clnt, req);
1676 goto error;
1677 }
1678
1679 P9_DPRINTK(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1680 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1681 "fsid %llu namelen %ld\n",
1682 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1683 sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree,
1684 sb->fsid, (long int)sb->namelen);
1685
1686 p9_free_req(clnt, req);
1687 error:
1688 return err;
1689 }
1690 EXPORT_SYMBOL(p9_client_statfs);
1691
1692 int p9_client_rename(struct p9_fid *fid,
1693 struct p9_fid *newdirfid, const char *name)
1694 {
1695 int err;
1696 struct p9_req_t *req;
1697 struct p9_client *clnt;
1698
1699 err = 0;
1700 clnt = fid->clnt;
1701
1702 P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1703 fid->fid, newdirfid->fid, name);
1704
1705 req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1706 newdirfid->fid, name);
1707 if (IS_ERR(req)) {
1708 err = PTR_ERR(req);
1709 goto error;
1710 }
1711
1712 P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1713
1714 p9_free_req(clnt, req);
1715 error:
1716 return err;
1717 }
1718 EXPORT_SYMBOL(p9_client_rename);
1719
1720 int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name,
1721 struct p9_fid *newdirfid, const char *new_name)
1722 {
1723 int err;
1724 struct p9_req_t *req;
1725 struct p9_client *clnt;
1726
1727 err = 0;
1728 clnt = olddirfid->clnt;
1729
1730 P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s"
1731 " newdirfid %d new name %s\n", olddirfid->fid, old_name,
1732 newdirfid->fid, new_name);
1733
1734 req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid,
1735 old_name, newdirfid->fid, new_name);
1736 if (IS_ERR(req)) {
1737 err = PTR_ERR(req);
1738 goto error;
1739 }
1740
1741 P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n",
1742 newdirfid->fid, new_name);
1743
1744 p9_free_req(clnt, req);
1745 error:
1746 return err;
1747 }
1748 EXPORT_SYMBOL(p9_client_renameat);
1749
1750 /*
1751 * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1752 */
1753 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1754 const char *attr_name, u64 *attr_size)
1755 {
1756 int err;
1757 struct p9_req_t *req;
1758 struct p9_client *clnt;
1759 struct p9_fid *attr_fid;
1760
1761 err = 0;
1762 clnt = file_fid->clnt;
1763 attr_fid = p9_fid_create(clnt);
1764 if (IS_ERR(attr_fid)) {
1765 err = PTR_ERR(attr_fid);
1766 attr_fid = NULL;
1767 goto error;
1768 }
1769 P9_DPRINTK(P9_DEBUG_9P,
1770 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
1771 file_fid->fid, attr_fid->fid, attr_name);
1772
1773 req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
1774 file_fid->fid, attr_fid->fid, attr_name);
1775 if (IS_ERR(req)) {
1776 err = PTR_ERR(req);
1777 goto error;
1778 }
1779 err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
1780 if (err) {
1781 P9_DUMP_PKT(1, req->rc);
1782 p9_free_req(clnt, req);
1783 goto clunk_fid;
1784 }
1785 p9_free_req(clnt, req);
1786 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n",
1787 attr_fid->fid, *attr_size);
1788 return attr_fid;
1789 clunk_fid:
1790 p9_client_clunk(attr_fid);
1791 attr_fid = NULL;
1792 error:
1793 if (attr_fid && (attr_fid != file_fid))
1794 p9_fid_destroy(attr_fid);
1795
1796 return ERR_PTR(err);
1797 }
1798 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
1799
1800 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
1801 u64 attr_size, int flags)
1802 {
1803 int err;
1804 struct p9_req_t *req;
1805 struct p9_client *clnt;
1806
1807 P9_DPRINTK(P9_DEBUG_9P,
1808 ">>> TXATTRCREATE fid %d name %s size %lld flag %d\n",
1809 fid->fid, name, (long long)attr_size, flags);
1810 err = 0;
1811 clnt = fid->clnt;
1812 req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
1813 fid->fid, name, attr_size, flags);
1814 if (IS_ERR(req)) {
1815 err = PTR_ERR(req);
1816 goto error;
1817 }
1818 P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
1819 p9_free_req(clnt, req);
1820 error:
1821 return err;
1822 }
1823 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
1824
1825 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
1826 {
1827 int err, rsize;
1828 struct p9_client *clnt;
1829 struct p9_req_t *req;
1830 char *dataptr;
1831
1832 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
1833 fid->fid, (long long unsigned) offset, count);
1834
1835 err = 0;
1836 clnt = fid->clnt;
1837
1838 rsize = fid->iounit;
1839 if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
1840 rsize = clnt->msize - P9_READDIRHDRSZ;
1841
1842 if (count < rsize)
1843 rsize = count;
1844
1845 if ((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
1846 P9_TRANS_PREF_PAYLOAD_SEP) {
1847 req = p9_client_rpc(clnt, P9_TREADDIR, "dqF", fid->fid,
1848 offset, rsize, data);
1849 } else {
1850 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
1851 offset, rsize);
1852 }
1853 if (IS_ERR(req)) {
1854 err = PTR_ERR(req);
1855 goto error;
1856 }
1857
1858 err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1859 if (err) {
1860 P9_DUMP_PKT(1, req->rc);
1861 goto free_and_error;
1862 }
1863
1864 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
1865
1866 if (!req->tc->pbuf_size && data)
1867 memmove(data, dataptr, count);
1868
1869 p9_free_req(clnt, req);
1870 return count;
1871
1872 free_and_error:
1873 p9_free_req(clnt, req);
1874 error:
1875 return err;
1876 }
1877 EXPORT_SYMBOL(p9_client_readdir);
1878
1879 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
1880 dev_t rdev, gid_t gid, struct p9_qid *qid)
1881 {
1882 int err;
1883 struct p9_client *clnt;
1884 struct p9_req_t *req;
1885
1886 err = 0;
1887 clnt = fid->clnt;
1888 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
1889 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
1890 req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode,
1891 MAJOR(rdev), MINOR(rdev), gid);
1892 if (IS_ERR(req))
1893 return PTR_ERR(req);
1894
1895 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1896 if (err) {
1897 P9_DUMP_PKT(1, req->rc);
1898 goto error;
1899 }
1900 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
1901 (unsigned long long)qid->path, qid->version);
1902
1903 error:
1904 p9_free_req(clnt, req);
1905 return err;
1906
1907 }
1908 EXPORT_SYMBOL(p9_client_mknod_dotl);
1909
1910 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
1911 gid_t gid, struct p9_qid *qid)
1912 {
1913 int err;
1914 struct p9_client *clnt;
1915 struct p9_req_t *req;
1916
1917 err = 0;
1918 clnt = fid->clnt;
1919 P9_DPRINTK(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
1920 fid->fid, name, mode, gid);
1921 req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode,
1922 gid);
1923 if (IS_ERR(req))
1924 return PTR_ERR(req);
1925
1926 err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1927 if (err) {
1928 P9_DUMP_PKT(1, req->rc);
1929 goto error;
1930 }
1931 P9_DPRINTK(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
1932 (unsigned long long)qid->path, qid->version);
1933
1934 error:
1935 p9_free_req(clnt, req);
1936 return err;
1937
1938 }
1939 EXPORT_SYMBOL(p9_client_mkdir_dotl);
1940
1941 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
1942 {
1943 int err;
1944 struct p9_client *clnt;
1945 struct p9_req_t *req;
1946
1947 err = 0;
1948 clnt = fid->clnt;
1949 P9_DPRINTK(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
1950 "start %lld length %lld proc_id %d client_id %s\n",
1951 fid->fid, flock->type, flock->flags, flock->start,
1952 flock->length, flock->proc_id, flock->client_id);
1953
1954 req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
1955 flock->flags, flock->start, flock->length,
1956 flock->proc_id, flock->client_id);
1957
1958 if (IS_ERR(req))
1959 return PTR_ERR(req);
1960
1961 err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
1962 if (err) {
1963 P9_DUMP_PKT(1, req->rc);
1964 goto error;
1965 }
1966 P9_DPRINTK(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
1967 error:
1968 p9_free_req(clnt, req);
1969 return err;
1970
1971 }
1972 EXPORT_SYMBOL(p9_client_lock_dotl);
1973
1974 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
1975 {
1976 int err;
1977 struct p9_client *clnt;
1978 struct p9_req_t *req;
1979
1980 err = 0;
1981 clnt = fid->clnt;
1982 P9_DPRINTK(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
1983 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
1984 glock->start, glock->length, glock->proc_id, glock->client_id);
1985
1986 req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type,
1987 glock->start, glock->length, glock->proc_id, glock->client_id);
1988
1989 if (IS_ERR(req))
1990 return PTR_ERR(req);
1991
1992 err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
1993 &glock->start, &glock->length, &glock->proc_id,
1994 &glock->client_id);
1995 if (err) {
1996 P9_DUMP_PKT(1, req->rc);
1997 goto error;
1998 }
1999 P9_DPRINTK(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
2000 "proc_id %d client_id %s\n", glock->type, glock->start,
2001 glock->length, glock->proc_id, glock->client_id);
2002 error:
2003 p9_free_req(clnt, req);
2004 return err;
2005 }
2006 EXPORT_SYMBOL(p9_client_getlock_dotl);
2007
2008 int p9_client_readlink(struct p9_fid *fid, char **target)
2009 {
2010 int err;
2011 struct p9_client *clnt;
2012 struct p9_req_t *req;
2013
2014 err = 0;
2015 clnt = fid->clnt;
2016 P9_DPRINTK(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
2017
2018 req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
2019 if (IS_ERR(req))
2020 return PTR_ERR(req);
2021
2022 err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
2023 if (err) {
2024 P9_DUMP_PKT(1, req->rc);
2025 goto error;
2026 }
2027 P9_DPRINTK(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
2028 error:
2029 p9_free_req(clnt, req);
2030 return err;
2031 }
2032 EXPORT_SYMBOL(p9_client_readlink);
linux-next