Merge branch 'for-rmk/samsung6' of git://git.fluff.org/bjdooks/linux into devel-stable
[linux-2.6.git] / net / 9p / client.c
1 /*
2  * net/9p/clnt.c
3  *
4  * 9P Client
5  *
6  *  Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
7  *  Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net>
8  *
9  *  This program is free software; you can redistribute it and/or modify
10  *  it under the terms of the GNU General Public License version 2
11  *  as published by the Free Software Foundation.
12  *
13  *  This program is distributed in the hope that it will be useful,
14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  *  GNU General Public License for more details.
17  *
18  *  You should have received a copy of the GNU General Public License
19  *  along with this program; if not, write to:
20  *  Free Software Foundation
21  *  51 Franklin Street, Fifth Floor
22  *  Boston, MA  02111-1301  USA
23  *
24  */
25
26 #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/sched.h>
33 #include <linux/uaccess.h>
34 #include <net/9p/9p.h>
35 #include <linux/parser.h>
36 #include <net/9p/client.h>
37 #include <net/9p/transport.h>
38 #include "protocol.h"
39
40 /*
41   * Client Option Parsing (code inspired by NFS code)
42   *  - a little lazy - parse all client options
43   */
44
45 enum {
46         Opt_msize,
47         Opt_trans,
48         Opt_legacy,
49         Opt_err,
50 };
51
52 static const match_table_t tokens = {
53         {Opt_msize, "msize=%u"},
54         {Opt_legacy, "noextend"},
55         {Opt_trans, "trans=%s"},
56         {Opt_err, NULL},
57 };
58
59 static struct p9_req_t *
60 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
61
62 /**
63  * parse_options - parse mount options into client structure
64  * @opts: options string passed from mount
65  * @clnt: existing v9fs client information
66  *
67  * Return 0 upon success, -ERRNO upon failure
68  */
69
70 static int parse_opts(char *opts, struct p9_client *clnt)
71 {
72         char *options, *tmp_options;
73         char *p;
74         substring_t args[MAX_OPT_ARGS];
75         int option;
76         int ret = 0;
77
78         clnt->dotu = 1;
79         clnt->msize = 8192;
80
81         if (!opts)
82                 return 0;
83
84         tmp_options = kstrdup(opts, GFP_KERNEL);
85         if (!tmp_options) {
86                 P9_DPRINTK(P9_DEBUG_ERROR,
87                                 "failed to allocate copy of option string\n");
88                 return -ENOMEM;
89         }
90         options = tmp_options;
91
92         while ((p = strsep(&options, ",")) != NULL) {
93                 int token;
94                 if (!*p)
95                         continue;
96                 token = match_token(p, tokens, args);
97                 if (token < Opt_trans) {
98                         int r = match_int(&args[0], &option);
99                         if (r < 0) {
100                                 P9_DPRINTK(P9_DEBUG_ERROR,
101                                         "integer field, but no integer?\n");
102                                 ret = r;
103                                 continue;
104                         }
105                 }
106                 switch (token) {
107                 case Opt_msize:
108                         clnt->msize = option;
109                         break;
110                 case Opt_trans:
111                         clnt->trans_mod = v9fs_get_trans_by_name(&args[0]);
112                         if(clnt->trans_mod == NULL) {
113                                 P9_DPRINTK(P9_DEBUG_ERROR,
114                                    "Could not find request transport: %s\n",
115                                    (char *) &args[0]);
116                                 ret = -EINVAL;
117                                 goto free_and_return;
118                         }
119                         break;
120                 case Opt_legacy:
121                         clnt->dotu = 0;
122                         break;
123                 default:
124                         continue;
125                 }
126         }
127
128 free_and_return:
129         kfree(tmp_options);
130         return ret;
131 }
132
133 /**
134  * p9_tag_alloc - lookup/allocate a request by tag
135  * @c: client session to lookup tag within
136  * @tag: numeric id for transaction
137  *
138  * this is a simple array lookup, but will grow the
139  * request_slots as necessary to accomodate transaction
140  * ids which did not previously have a slot.
141  *
142  * this code relies on the client spinlock to manage locks, its
143  * possible we should switch to something else, but I'd rather
144  * stick with something low-overhead for the common case.
145  *
146  */
147
148 static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag)
149 {
150         unsigned long flags;
151         int row, col;
152         struct p9_req_t *req;
153
154         /* This looks up the original request by tag so we know which
155          * buffer to read the data into */
156         tag++;
157
158         if (tag >= c->max_tag) {
159                 spin_lock_irqsave(&c->lock, flags);
160                 /* check again since original check was outside of lock */
161                 while (tag >= c->max_tag) {
162                         row = (tag / P9_ROW_MAXTAG);
163                         c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
164                                         sizeof(struct p9_req_t), GFP_ATOMIC);
165
166                         if (!c->reqs[row]) {
167                                 printk(KERN_ERR "Couldn't grow tag array\n");
168                                 spin_unlock_irqrestore(&c->lock, flags);
169                                 return ERR_PTR(-ENOMEM);
170                         }
171                         for (col = 0; col < P9_ROW_MAXTAG; col++) {
172                                 c->reqs[row][col].status = REQ_STATUS_IDLE;
173                                 c->reqs[row][col].tc = NULL;
174                         }
175                         c->max_tag += P9_ROW_MAXTAG;
176                 }
177                 spin_unlock_irqrestore(&c->lock, flags);
178         }
179         row = tag / P9_ROW_MAXTAG;
180         col = tag % P9_ROW_MAXTAG;
181
182         req = &c->reqs[row][col];
183         if (!req->tc) {
184                 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_KERNEL);
185                 if (!req->wq) {
186                         printk(KERN_ERR "Couldn't grow tag array\n");
187                         return ERR_PTR(-ENOMEM);
188                 }
189                 init_waitqueue_head(req->wq);
190                 req->tc = kmalloc(sizeof(struct p9_fcall)+c->msize,
191                                                                 GFP_KERNEL);
192                 req->rc = kmalloc(sizeof(struct p9_fcall)+c->msize,
193                                                                 GFP_KERNEL);
194                 if ((!req->tc) || (!req->rc)) {
195                         printk(KERN_ERR "Couldn't grow tag array\n");
196                         kfree(req->tc);
197                         kfree(req->rc);
198                         kfree(req->wq);
199                         req->tc = req->rc = NULL;
200                         req->wq = NULL;
201                         return ERR_PTR(-ENOMEM);
202                 }
203                 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
204                 req->tc->capacity = c->msize;
205                 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
206                 req->rc->capacity = c->msize;
207         }
208
209         p9pdu_reset(req->tc);
210         p9pdu_reset(req->rc);
211
212         req->tc->tag = tag-1;
213         req->status = REQ_STATUS_ALLOC;
214
215         return &c->reqs[row][col];
216 }
217
218 /**
219  * p9_tag_lookup - lookup a request by tag
220  * @c: client session to lookup tag within
221  * @tag: numeric id for transaction
222  *
223  */
224
225 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
226 {
227         int row, col;
228
229         /* This looks up the original request by tag so we know which
230          * buffer to read the data into */
231         tag++;
232
233         BUG_ON(tag >= c->max_tag);
234
235         row = tag / P9_ROW_MAXTAG;
236         col = tag % P9_ROW_MAXTAG;
237
238         return &c->reqs[row][col];
239 }
240 EXPORT_SYMBOL(p9_tag_lookup);
241
242 /**
243  * p9_tag_init - setup tags structure and contents
244  * @c:  v9fs client struct
245  *
246  * This initializes the tags structure for each client instance.
247  *
248  */
249
250 static int p9_tag_init(struct p9_client *c)
251 {
252         int err = 0;
253
254         c->tagpool = p9_idpool_create();
255         if (IS_ERR(c->tagpool)) {
256                 err = PTR_ERR(c->tagpool);
257                 c->tagpool = NULL;
258                 goto error;
259         }
260
261         p9_idpool_get(c->tagpool); /* reserve tag 0 */
262
263         c->max_tag = 0;
264 error:
265         return err;
266 }
267
268 /**
269  * p9_tag_cleanup - cleans up tags structure and reclaims resources
270  * @c:  v9fs client struct
271  *
272  * This frees resources associated with the tags structure
273  *
274  */
275 static void p9_tag_cleanup(struct p9_client *c)
276 {
277         int row, col;
278
279         /* check to insure all requests are idle */
280         for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
281                 for (col = 0; col < P9_ROW_MAXTAG; col++) {
282                         if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
283                                 P9_DPRINTK(P9_DEBUG_MUX,
284                                   "Attempting to cleanup non-free tag %d,%d\n",
285                                   row, col);
286                                 /* TODO: delay execution of cleanup */
287                                 return;
288                         }
289                 }
290         }
291
292         if (c->tagpool)
293                 p9_idpool_destroy(c->tagpool);
294
295         /* free requests associated with tags */
296         for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
297                 for (col = 0; col < P9_ROW_MAXTAG; col++) {
298                         kfree(c->reqs[row][col].wq);
299                         kfree(c->reqs[row][col].tc);
300                         kfree(c->reqs[row][col].rc);
301                 }
302                 kfree(c->reqs[row]);
303         }
304         c->max_tag = 0;
305 }
306
307 /**
308  * p9_free_req - free a request and clean-up as necessary
309  * c: client state
310  * r: request to release
311  *
312  */
313
314 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
315 {
316         int tag = r->tc->tag;
317         P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
318
319         r->status = REQ_STATUS_IDLE;
320         if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
321                 p9_idpool_put(tag, c->tagpool);
322 }
323
324 /**
325  * p9_client_cb - call back from transport to client
326  * c: client state
327  * req: request received
328  *
329  */
330 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
331 {
332         P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
333         wake_up(req->wq);
334         P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
335 }
336 EXPORT_SYMBOL(p9_client_cb);
337
338 /**
339  * p9_parse_header - parse header arguments out of a packet
340  * @pdu: packet to parse
341  * @size: size of packet
342  * @type: type of request
343  * @tag: tag of packet
344  * @rewind: set if we need to rewind offset afterwards
345  */
346
347 int
348 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
349                                                                 int rewind)
350 {
351         int8_t r_type;
352         int16_t r_tag;
353         int32_t r_size;
354         int offset = pdu->offset;
355         int err;
356
357         pdu->offset = 0;
358         if (pdu->size == 0)
359                 pdu->size = 7;
360
361         err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
362         if (err)
363                 goto rewind_and_exit;
364
365         pdu->size = r_size;
366         pdu->id = r_type;
367         pdu->tag = r_tag;
368
369         P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size,
370                                                         pdu->id, pdu->tag);
371
372         if (type)
373                 *type = r_type;
374         if (tag)
375                 *tag = r_tag;
376         if (size)
377                 *size = r_size;
378
379
380 rewind_and_exit:
381         if (rewind)
382                 pdu->offset = offset;
383         return err;
384 }
385 EXPORT_SYMBOL(p9_parse_header);
386
387 /**
388  * p9_check_errors - check 9p packet for error return and process it
389  * @c: current client instance
390  * @req: request to parse and check for error conditions
391  *
392  * returns error code if one is discovered, otherwise returns 0
393  *
394  * this will have to be more complicated if we have multiple
395  * error packet types
396  */
397
398 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
399 {
400         int8_t type;
401         int err;
402
403         err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
404         if (err) {
405                 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
406                 return err;
407         }
408
409         if (type == P9_RERROR) {
410                 int ecode;
411                 char *ename;
412
413                 err = p9pdu_readf(req->rc, c->dotu, "s?d", &ename, &ecode);
414                 if (err) {
415                         P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n",
416                                                                         err);
417                         return err;
418                 }
419
420                 if (c->dotu)
421                         err = -ecode;
422
423                 if (!err || !IS_ERR_VALUE(err))
424                         err = p9_errstr2errno(ename, strlen(ename));
425
426                 P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode, ename);
427
428                 kfree(ename);
429         } else
430                 err = 0;
431
432         return err;
433 }
434
435 /**
436  * p9_client_flush - flush (cancel) a request
437  * @c: client state
438  * @oldreq: request to cancel
439  *
440  * This sents a flush for a particular requests and links
441  * the flush request to the original request.  The current
442  * code only supports a single flush request although the protocol
443  * allows for multiple flush requests to be sent for a single request.
444  *
445  */
446
447 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
448 {
449         struct p9_req_t *req;
450         int16_t oldtag;
451         int err;
452
453         err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
454         if (err)
455                 return err;
456
457         P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
458
459         req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
460         if (IS_ERR(req))
461                 return PTR_ERR(req);
462
463
464         /* if we haven't received a response for oldreq,
465            remove it from the list. */
466         spin_lock(&c->lock);
467         if (oldreq->status == REQ_STATUS_FLSH)
468                 list_del(&oldreq->req_list);
469         spin_unlock(&c->lock);
470
471         p9_free_req(c, req);
472         return 0;
473 }
474
475 /**
476  * p9_client_rpc - issue a request and wait for a response
477  * @c: client session
478  * @type: type of request
479  * @fmt: protocol format string (see protocol.c)
480  *
481  * Returns request structure (which client must free using p9_free_req)
482  */
483
484 static struct p9_req_t *
485 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
486 {
487         va_list ap;
488         int tag, err;
489         struct p9_req_t *req;
490         unsigned long flags;
491         int sigpending;
492
493         P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
494
495         if (c->status != Connected)
496                 return ERR_PTR(-EIO);
497
498         if (signal_pending(current)) {
499                 sigpending = 1;
500                 clear_thread_flag(TIF_SIGPENDING);
501         } else
502                 sigpending = 0;
503
504         tag = P9_NOTAG;
505         if (type != P9_TVERSION) {
506                 tag = p9_idpool_get(c->tagpool);
507                 if (tag < 0)
508                         return ERR_PTR(-ENOMEM);
509         }
510
511         req = p9_tag_alloc(c, tag);
512         if (IS_ERR(req))
513                 return req;
514
515         /* marshall the data */
516         p9pdu_prepare(req->tc, tag, type);
517         va_start(ap, fmt);
518         err = p9pdu_vwritef(req->tc, c->dotu, fmt, ap);
519         va_end(ap);
520         p9pdu_finalize(req->tc);
521
522         err = c->trans_mod->request(c, req);
523         if (err < 0) {
524                 c->status = Disconnected;
525                 goto reterr;
526         }
527
528         P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag);
529         err = wait_event_interruptible(*req->wq,
530                                                 req->status >= REQ_STATUS_RCVD);
531         P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n",
532                                                 req->wq, tag, err);
533
534         if (req->status == REQ_STATUS_ERROR) {
535                 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
536                 err = req->t_err;
537         }
538
539         if ((err == -ERESTARTSYS) && (c->status == Connected)) {
540                 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
541                 sigpending = 1;
542                 clear_thread_flag(TIF_SIGPENDING);
543
544                 if (c->trans_mod->cancel(c, req))
545                         p9_client_flush(c, req);
546
547                 /* if we received the response anyway, don't signal error */
548                 if (req->status == REQ_STATUS_RCVD)
549                         err = 0;
550         }
551
552         if (sigpending) {
553                 spin_lock_irqsave(&current->sighand->siglock, flags);
554                 recalc_sigpending();
555                 spin_unlock_irqrestore(&current->sighand->siglock, flags);
556         }
557
558         if (err < 0)
559                 goto reterr;
560
561         err = p9_check_errors(c, req);
562         if (!err) {
563                 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
564                 return req;
565         }
566
567 reterr:
568         P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
569                                                                         err);
570         p9_free_req(c, req);
571         return ERR_PTR(err);
572 }
573
574 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
575 {
576         int ret;
577         struct p9_fid *fid;
578         unsigned long flags;
579
580         P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
581         fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
582         if (!fid)
583                 return ERR_PTR(-ENOMEM);
584
585         ret = p9_idpool_get(clnt->fidpool);
586         if (ret < 0) {
587                 ret = -ENOSPC;
588                 goto error;
589         }
590         fid->fid = ret;
591
592         memset(&fid->qid, 0, sizeof(struct p9_qid));
593         fid->mode = -1;
594         fid->uid = current_fsuid();
595         fid->clnt = clnt;
596         fid->rdir = NULL;
597         spin_lock_irqsave(&clnt->lock, flags);
598         list_add(&fid->flist, &clnt->fidlist);
599         spin_unlock_irqrestore(&clnt->lock, flags);
600
601         return fid;
602
603 error:
604         kfree(fid);
605         return ERR_PTR(ret);
606 }
607
608 static void p9_fid_destroy(struct p9_fid *fid)
609 {
610         struct p9_client *clnt;
611         unsigned long flags;
612
613         P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
614         clnt = fid->clnt;
615         p9_idpool_put(fid->fid, clnt->fidpool);
616         spin_lock_irqsave(&clnt->lock, flags);
617         list_del(&fid->flist);
618         spin_unlock_irqrestore(&clnt->lock, flags);
619         kfree(fid->rdir);
620         kfree(fid);
621 }
622
623 int p9_client_version(struct p9_client *c)
624 {
625         int err = 0;
626         struct p9_req_t *req;
627         char *version;
628         int msize;
629
630         P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d extended %d\n",
631                                                         c->msize, c->dotu);
632         req = p9_client_rpc(c, P9_TVERSION, "ds", c->msize,
633                                 c->dotu ? "9P2000.u" : "9P2000");
634         if (IS_ERR(req))
635                 return PTR_ERR(req);
636
637         err = p9pdu_readf(req->rc, c->dotu, "ds", &msize, &version);
638         if (err) {
639                 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
640                 p9pdu_dump(1, req->rc);
641                 goto error;
642         }
643
644         P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
645         if (!memcmp(version, "9P2000.u", 8))
646                 c->dotu = 1;
647         else if (!memcmp(version, "9P2000", 6))
648                 c->dotu = 0;
649         else {
650                 err = -EREMOTEIO;
651                 goto error;
652         }
653
654         if (msize < c->msize)
655                 c->msize = msize;
656
657 error:
658         kfree(version);
659         p9_free_req(c, req);
660
661         return err;
662 }
663 EXPORT_SYMBOL(p9_client_version);
664
665 struct p9_client *p9_client_create(const char *dev_name, char *options)
666 {
667         int err;
668         struct p9_client *clnt;
669
670         err = 0;
671         clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
672         if (!clnt)
673                 return ERR_PTR(-ENOMEM);
674
675         clnt->trans_mod = NULL;
676         clnt->trans = NULL;
677         spin_lock_init(&clnt->lock);
678         INIT_LIST_HEAD(&clnt->fidlist);
679
680         p9_tag_init(clnt);
681
682         err = parse_opts(options, clnt);
683         if (err < 0)
684                 goto free_client;
685
686         if (!clnt->trans_mod)
687                 clnt->trans_mod = v9fs_get_default_trans();
688
689         if (clnt->trans_mod == NULL) {
690                 err = -EPROTONOSUPPORT;
691                 P9_DPRINTK(P9_DEBUG_ERROR,
692                                 "No transport defined or default transport\n");
693                 goto free_client;
694         }
695
696         clnt->fidpool = p9_idpool_create();
697         if (IS_ERR(clnt->fidpool)) {
698                 err = PTR_ERR(clnt->fidpool);
699                 clnt->fidpool = NULL;
700                 goto put_trans;
701         }
702
703         P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d dotu %d\n",
704                 clnt, clnt->trans_mod, clnt->msize, clnt->dotu);
705
706         err = clnt->trans_mod->create(clnt, dev_name, options);
707         if (err)
708                 goto destroy_fidpool;
709
710         if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize)
711                 clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ;
712
713         err = p9_client_version(clnt);
714         if (err)
715                 goto close_trans;
716
717         return clnt;
718
719 close_trans:
720         clnt->trans_mod->close(clnt);
721 destroy_fidpool:
722         p9_idpool_destroy(clnt->fidpool);
723 put_trans:
724         v9fs_put_trans(clnt->trans_mod);
725 free_client:
726         kfree(clnt);
727         return ERR_PTR(err);
728 }
729 EXPORT_SYMBOL(p9_client_create);
730
731 void p9_client_destroy(struct p9_client *clnt)
732 {
733         struct p9_fid *fid, *fidptr;
734
735         P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt);
736
737         if (clnt->trans_mod)
738                 clnt->trans_mod->close(clnt);
739
740         v9fs_put_trans(clnt->trans_mod);
741
742         list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist)
743                 p9_fid_destroy(fid);
744
745         if (clnt->fidpool)
746                 p9_idpool_destroy(clnt->fidpool);
747
748         p9_tag_cleanup(clnt);
749
750         kfree(clnt);
751 }
752 EXPORT_SYMBOL(p9_client_destroy);
753
754 void p9_client_disconnect(struct p9_client *clnt)
755 {
756         P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
757         clnt->status = Disconnected;
758 }
759 EXPORT_SYMBOL(p9_client_disconnect);
760
761 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
762         char *uname, u32 n_uname, char *aname)
763 {
764         int err;
765         struct p9_req_t *req;
766         struct p9_fid *fid;
767         struct p9_qid qid;
768
769         P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
770                                         afid ? afid->fid : -1, uname, aname);
771         err = 0;
772
773         fid = p9_fid_create(clnt);
774         if (IS_ERR(fid)) {
775                 err = PTR_ERR(fid);
776                 fid = NULL;
777                 goto error;
778         }
779
780         req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
781                         afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
782         if (IS_ERR(req)) {
783                 err = PTR_ERR(req);
784                 goto error;
785         }
786
787         err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid);
788         if (err) {
789                 p9pdu_dump(1, req->rc);
790                 p9_free_req(clnt, req);
791                 goto error;
792         }
793
794         P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
795                                         qid.type,
796                                         (unsigned long long)qid.path,
797                                         qid.version);
798
799         memmove(&fid->qid, &qid, sizeof(struct p9_qid));
800
801         p9_free_req(clnt, req);
802         return fid;
803
804 error:
805         if (fid)
806                 p9_fid_destroy(fid);
807         return ERR_PTR(err);
808 }
809 EXPORT_SYMBOL(p9_client_attach);
810
811 struct p9_fid *
812 p9_client_auth(struct p9_client *clnt, char *uname, u32 n_uname, char *aname)
813 {
814         int err;
815         struct p9_req_t *req;
816         struct p9_qid qid;
817         struct p9_fid *afid;
818
819         P9_DPRINTK(P9_DEBUG_9P, ">>> TAUTH uname %s aname %s\n", uname, aname);
820         err = 0;
821
822         afid = p9_fid_create(clnt);
823         if (IS_ERR(afid)) {
824                 err = PTR_ERR(afid);
825                 afid = NULL;
826                 goto error;
827         }
828
829         req = p9_client_rpc(clnt, P9_TAUTH, "dss?d",
830                         afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
831         if (IS_ERR(req)) {
832                 err = PTR_ERR(req);
833                 goto error;
834         }
835
836         err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid);
837         if (err) {
838                 p9pdu_dump(1, req->rc);
839                 p9_free_req(clnt, req);
840                 goto error;
841         }
842
843         P9_DPRINTK(P9_DEBUG_9P, "<<< RAUTH qid %x.%llx.%x\n",
844                                         qid.type,
845                                         (unsigned long long)qid.path,
846                                         qid.version);
847
848         memmove(&afid->qid, &qid, sizeof(struct p9_qid));
849         p9_free_req(clnt, req);
850         return afid;
851
852 error:
853         if (afid)
854                 p9_fid_destroy(afid);
855         return ERR_PTR(err);
856 }
857 EXPORT_SYMBOL(p9_client_auth);
858
859 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
860         int clone)
861 {
862         int err;
863         struct p9_client *clnt;
864         struct p9_fid *fid;
865         struct p9_qid *wqids;
866         struct p9_req_t *req;
867         int16_t nwqids, count;
868
869         err = 0;
870         clnt = oldfid->clnt;
871         if (clone) {
872                 fid = p9_fid_create(clnt);
873                 if (IS_ERR(fid)) {
874                         err = PTR_ERR(fid);
875                         fid = NULL;
876                         goto error;
877                 }
878
879                 fid->uid = oldfid->uid;
880         } else
881                 fid = oldfid;
882
883
884         P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n",
885                 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
886
887         req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
888                                                                 nwname, wnames);
889         if (IS_ERR(req)) {
890                 err = PTR_ERR(req);
891                 goto error;
892         }
893
894         err = p9pdu_readf(req->rc, clnt->dotu, "R", &nwqids, &wqids);
895         if (err) {
896                 p9pdu_dump(1, req->rc);
897                 p9_free_req(clnt, req);
898                 goto clunk_fid;
899         }
900         p9_free_req(clnt, req);
901
902         P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
903
904         if (nwqids != nwname) {
905                 err = -ENOENT;
906                 goto clunk_fid;
907         }
908
909         for (count = 0; count < nwqids; count++)
910                 P9_DPRINTK(P9_DEBUG_9P, "<<<     [%d] %x.%llx.%x\n",
911                         count, wqids[count].type,
912                         (unsigned long long)wqids[count].path,
913                         wqids[count].version);
914
915         if (nwname)
916                 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
917         else
918                 fid->qid = oldfid->qid;
919
920         return fid;
921
922 clunk_fid:
923         p9_client_clunk(fid);
924         fid = NULL;
925
926 error:
927         if (fid && (fid != oldfid))
928                 p9_fid_destroy(fid);
929
930         return ERR_PTR(err);
931 }
932 EXPORT_SYMBOL(p9_client_walk);
933
934 int p9_client_open(struct p9_fid *fid, int mode)
935 {
936         int err;
937         struct p9_client *clnt;
938         struct p9_req_t *req;
939         struct p9_qid qid;
940         int iounit;
941
942         P9_DPRINTK(P9_DEBUG_9P, ">>> TOPEN fid %d mode %d\n", fid->fid, mode);
943         err = 0;
944         clnt = fid->clnt;
945
946         if (fid->mode != -1)
947                 return -EINVAL;
948
949         req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
950         if (IS_ERR(req)) {
951                 err = PTR_ERR(req);
952                 goto error;
953         }
954
955         err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit);
956         if (err) {
957                 p9pdu_dump(1, req->rc);
958                 goto free_and_error;
959         }
960
961         P9_DPRINTK(P9_DEBUG_9P, "<<< ROPEN qid %x.%llx.%x iounit %x\n",
962                                 qid.type,
963                                 (unsigned long long)qid.path,
964                                 qid.version, iounit);
965
966         fid->mode = mode;
967         fid->iounit = iounit;
968
969 free_and_error:
970         p9_free_req(clnt, req);
971 error:
972         return err;
973 }
974 EXPORT_SYMBOL(p9_client_open);
975
976 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
977                      char *extension)
978 {
979         int err;
980         struct p9_client *clnt;
981         struct p9_req_t *req;
982         struct p9_qid qid;
983         int iounit;
984
985         P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
986                                                 fid->fid, name, perm, mode);
987         err = 0;
988         clnt = fid->clnt;
989
990         if (fid->mode != -1)
991                 return -EINVAL;
992
993         req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
994                                 mode, extension);
995         if (IS_ERR(req)) {
996                 err = PTR_ERR(req);
997                 goto error;
998         }
999
1000         err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit);
1001         if (err) {
1002                 p9pdu_dump(1, req->rc);
1003                 goto free_and_error;
1004         }
1005
1006         P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1007                                 qid.type,
1008                                 (unsigned long long)qid.path,
1009                                 qid.version, iounit);
1010
1011         fid->mode = mode;
1012         fid->iounit = iounit;
1013
1014 free_and_error:
1015         p9_free_req(clnt, req);
1016 error:
1017         return err;
1018 }
1019 EXPORT_SYMBOL(p9_client_fcreate);
1020
1021 int p9_client_clunk(struct p9_fid *fid)
1022 {
1023         int err;
1024         struct p9_client *clnt;
1025         struct p9_req_t *req;
1026
1027         P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
1028         err = 0;
1029         clnt = fid->clnt;
1030
1031         req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1032         if (IS_ERR(req)) {
1033                 err = PTR_ERR(req);
1034                 goto error;
1035         }
1036
1037         P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1038
1039         p9_free_req(clnt, req);
1040         p9_fid_destroy(fid);
1041
1042 error:
1043         return err;
1044 }
1045 EXPORT_SYMBOL(p9_client_clunk);
1046
1047 int p9_client_remove(struct p9_fid *fid)
1048 {
1049         int err;
1050         struct p9_client *clnt;
1051         struct p9_req_t *req;
1052
1053         P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1054         err = 0;
1055         clnt = fid->clnt;
1056
1057         req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1058         if (IS_ERR(req)) {
1059                 err = PTR_ERR(req);
1060                 goto error;
1061         }
1062
1063         P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1064
1065         p9_free_req(clnt, req);
1066         p9_fid_destroy(fid);
1067
1068 error:
1069         return err;
1070 }
1071 EXPORT_SYMBOL(p9_client_remove);
1072
1073 int
1074 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1075                                                                 u32 count)
1076 {
1077         int err, rsize, total;
1078         struct p9_client *clnt;
1079         struct p9_req_t *req;
1080         char *dataptr;
1081
1082         P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid,
1083                                         (long long unsigned) offset, count);
1084         err = 0;
1085         clnt = fid->clnt;
1086         total = 0;
1087
1088         rsize = fid->iounit;
1089         if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1090                 rsize = clnt->msize - P9_IOHDRSZ;
1091
1092         if (count < rsize)
1093                 rsize = count;
1094
1095         req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, rsize);
1096         if (IS_ERR(req)) {
1097                 err = PTR_ERR(req);
1098                 goto error;
1099         }
1100
1101         err = p9pdu_readf(req->rc, clnt->dotu, "D", &count, &dataptr);
1102         if (err) {
1103                 p9pdu_dump(1, req->rc);
1104                 goto free_and_error;
1105         }
1106
1107         P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1108
1109         if (data) {
1110                 memmove(data, dataptr, count);
1111         }
1112
1113         if (udata) {
1114                 err = copy_to_user(udata, dataptr, count);
1115                 if (err) {
1116                         err = -EFAULT;
1117                         goto free_and_error;
1118                 }
1119         }
1120
1121         p9_free_req(clnt, req);
1122         return count;
1123
1124 free_and_error:
1125         p9_free_req(clnt, req);
1126 error:
1127         return err;
1128 }
1129 EXPORT_SYMBOL(p9_client_read);
1130
1131 int
1132 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1133                                                         u64 offset, u32 count)
1134 {
1135         int err, rsize, total;
1136         struct p9_client *clnt;
1137         struct p9_req_t *req;
1138
1139         P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1140                                 fid->fid, (long long unsigned) offset, count);
1141         err = 0;
1142         clnt = fid->clnt;
1143         total = 0;
1144
1145         rsize = fid->iounit;
1146         if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1147                 rsize = clnt->msize - P9_IOHDRSZ;
1148
1149         if (count < rsize)
1150                 rsize = count;
1151         if (data)
1152                 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, offset,
1153                                                                 rsize, data);
1154         else
1155                 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, offset,
1156                                                                 rsize, udata);
1157         if (IS_ERR(req)) {
1158                 err = PTR_ERR(req);
1159                 goto error;
1160         }
1161
1162         err = p9pdu_readf(req->rc, clnt->dotu, "d", &count);
1163         if (err) {
1164                 p9pdu_dump(1, req->rc);
1165                 goto free_and_error;
1166         }
1167
1168         P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1169
1170         p9_free_req(clnt, req);
1171         return count;
1172
1173 free_and_error:
1174         p9_free_req(clnt, req);
1175 error:
1176         return err;
1177 }
1178 EXPORT_SYMBOL(p9_client_write);
1179
1180 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1181 {
1182         int err;
1183         struct p9_client *clnt;
1184         struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1185         struct p9_req_t *req;
1186         u16 ignored;
1187
1188         P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1189
1190         if (!ret)
1191                 return ERR_PTR(-ENOMEM);
1192
1193         err = 0;
1194         clnt = fid->clnt;
1195
1196         req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1197         if (IS_ERR(req)) {
1198                 err = PTR_ERR(req);
1199                 goto error;
1200         }
1201
1202         err = p9pdu_readf(req->rc, clnt->dotu, "wS", &ignored, ret);
1203         if (err) {
1204                 p9pdu_dump(1, req->rc);
1205                 p9_free_req(clnt, req);
1206                 goto error;
1207         }
1208
1209         P9_DPRINTK(P9_DEBUG_9P,
1210                 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1211                 "<<<    mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1212                 "<<<    name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1213                 "<<<    uid=%d gid=%d n_muid=%d\n",
1214                 ret->size, ret->type, ret->dev, ret->qid.type,
1215                 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1216                 ret->atime, ret->mtime, (unsigned long long)ret->length,
1217                 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1218                 ret->n_uid, ret->n_gid, ret->n_muid);
1219
1220         p9_free_req(clnt, req);
1221         return ret;
1222
1223 error:
1224         kfree(ret);
1225         return ERR_PTR(err);
1226 }
1227 EXPORT_SYMBOL(p9_client_stat);
1228
1229 static int p9_client_statsize(struct p9_wstat *wst, int optional)
1230 {
1231         int ret;
1232
1233         /* NOTE: size shouldn't include its own length */
1234         /* size[2] type[2] dev[4] qid[13] */
1235         /* mode[4] atime[4] mtime[4] length[8]*/
1236         /* name[s] uid[s] gid[s] muid[s] */
1237         ret = 2+4+13+4+4+4+8+2+2+2+2;
1238
1239         if (wst->name)
1240                 ret += strlen(wst->name);
1241         if (wst->uid)
1242                 ret += strlen(wst->uid);
1243         if (wst->gid)
1244                 ret += strlen(wst->gid);
1245         if (wst->muid)
1246                 ret += strlen(wst->muid);
1247
1248         if (optional) {
1249                 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1250                 if (wst->extension)
1251                         ret += strlen(wst->extension);
1252         }
1253
1254         return ret;
1255 }
1256
1257 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1258 {
1259         int err;
1260         struct p9_req_t *req;
1261         struct p9_client *clnt;
1262
1263         err = 0;
1264         clnt = fid->clnt;
1265         wst->size = p9_client_statsize(wst, clnt->dotu);
1266         P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1267         P9_DPRINTK(P9_DEBUG_9P,
1268                 "     sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1269                 "     mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1270                 "     name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1271                 "     uid=%d gid=%d n_muid=%d\n",
1272                 wst->size, wst->type, wst->dev, wst->qid.type,
1273                 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1274                 wst->atime, wst->mtime, (unsigned long long)wst->length,
1275                 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1276                 wst->n_uid, wst->n_gid, wst->n_muid);
1277
1278         req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1279         if (IS_ERR(req)) {
1280                 err = PTR_ERR(req);
1281                 goto error;
1282         }
1283
1284         P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1285
1286         p9_free_req(clnt, req);
1287 error:
1288         return err;
1289 }
1290 EXPORT_SYMBOL(p9_client_wstat);