net/9p: fix client code to fail more gracefully on protocol error
[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/slab.h>
33 #include <linux/sched.h>
34 #include <linux/uaccess.h>
35 #include <net/9p/9p.h>
36 #include <linux/parser.h>
37 #include <net/9p/client.h>
38 #include <net/9p/transport.h>
39 #include "protocol.h"
40
41 /*
42   * Client Option Parsing (code inspired by NFS code)
43   *  - a little lazy - parse all client options
44   */
45
46 enum {
47         Opt_msize,
48         Opt_trans,
49         Opt_legacy,
50         Opt_version,
51         Opt_err,
52 };
53
54 static const match_table_t tokens = {
55         {Opt_msize, "msize=%u"},
56         {Opt_legacy, "noextend"},
57         {Opt_trans, "trans=%s"},
58         {Opt_version, "version=%s"},
59         {Opt_err, NULL},
60 };
61
62 inline int p9_is_proto_dotl(struct p9_client *clnt)
63 {
64         return clnt->proto_version == p9_proto_2000L;
65 }
66 EXPORT_SYMBOL(p9_is_proto_dotl);
67
68 inline int p9_is_proto_dotu(struct p9_client *clnt)
69 {
70         return clnt->proto_version == p9_proto_2000u;
71 }
72 EXPORT_SYMBOL(p9_is_proto_dotu);
73
74 /* Interpret mount option for protocol version */
75 static int get_protocol_version(const substring_t *name)
76 {
77         int version = -EINVAL;
78
79         if (!strncmp("9p2000", name->from, name->to-name->from)) {
80                 version = p9_proto_legacy;
81                 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: Legacy\n");
82         } else if (!strncmp("9p2000.u", name->from, name->to-name->from)) {
83                 version = p9_proto_2000u;
84                 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.u\n");
85         } else if (!strncmp("9p2000.L", name->from, name->to-name->from)) {
86                 version = p9_proto_2000L;
87                 P9_DPRINTK(P9_DEBUG_9P, "Protocol version: 9P2000.L\n");
88         } else {
89                 P9_DPRINTK(P9_DEBUG_ERROR, "Unknown protocol version %s. ",
90                                                         name->from);
91         }
92         return version;
93 }
94
95 /**
96  * parse_options - parse mount options into client structure
97  * @opts: options string passed from mount
98  * @clnt: existing v9fs client information
99  *
100  * Return 0 upon success, -ERRNO upon failure
101  */
102
103 static int parse_opts(char *opts, struct p9_client *clnt)
104 {
105         char *options, *tmp_options;
106         char *p;
107         substring_t args[MAX_OPT_ARGS];
108         int option;
109         int ret = 0;
110
111         clnt->proto_version = p9_proto_2000u;
112         clnt->msize = 8192;
113
114         if (!opts)
115                 return 0;
116
117         tmp_options = kstrdup(opts, GFP_KERNEL);
118         if (!tmp_options) {
119                 P9_DPRINTK(P9_DEBUG_ERROR,
120                                 "failed to allocate copy of option string\n");
121                 return -ENOMEM;
122         }
123         options = tmp_options;
124
125         while ((p = strsep(&options, ",")) != NULL) {
126                 int token;
127                 if (!*p)
128                         continue;
129                 token = match_token(p, tokens, args);
130                 if (token < Opt_trans) {
131                         int r = match_int(&args[0], &option);
132                         if (r < 0) {
133                                 P9_DPRINTK(P9_DEBUG_ERROR,
134                                         "integer field, but no integer?\n");
135                                 ret = r;
136                                 continue;
137                         }
138                 }
139                 switch (token) {
140                 case Opt_msize:
141                         clnt->msize = option;
142                         break;
143                 case Opt_trans:
144                         clnt->trans_mod = v9fs_get_trans_by_name(&args[0]);
145                         if(clnt->trans_mod == NULL) {
146                                 P9_DPRINTK(P9_DEBUG_ERROR,
147                                    "Could not find request transport: %s\n",
148                                    (char *) &args[0]);
149                                 ret = -EINVAL;
150                                 goto free_and_return;
151                         }
152                         break;
153                 case Opt_legacy:
154                         clnt->proto_version = p9_proto_legacy;
155                         break;
156                 case Opt_version:
157                         ret = get_protocol_version(&args[0]);
158                         if (ret == -EINVAL)
159                                 goto free_and_return;
160                         clnt->proto_version = ret;
161                         break;
162                 default:
163                         continue;
164                 }
165         }
166
167 free_and_return:
168         kfree(tmp_options);
169         return ret;
170 }
171
172 /**
173  * p9_tag_alloc - lookup/allocate a request by tag
174  * @c: client session to lookup tag within
175  * @tag: numeric id for transaction
176  *
177  * this is a simple array lookup, but will grow the
178  * request_slots as necessary to accommodate transaction
179  * ids which did not previously have a slot.
180  *
181  * this code relies on the client spinlock to manage locks, its
182  * possible we should switch to something else, but I'd rather
183  * stick with something low-overhead for the common case.
184  *
185  */
186
187 static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag)
188 {
189         unsigned long flags;
190         int row, col;
191         struct p9_req_t *req;
192
193         /* This looks up the original request by tag so we know which
194          * buffer to read the data into */
195         tag++;
196
197         if (tag >= c->max_tag) {
198                 spin_lock_irqsave(&c->lock, flags);
199                 /* check again since original check was outside of lock */
200                 while (tag >= c->max_tag) {
201                         row = (tag / P9_ROW_MAXTAG);
202                         c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
203                                         sizeof(struct p9_req_t), GFP_ATOMIC);
204
205                         if (!c->reqs[row]) {
206                                 printk(KERN_ERR "Couldn't grow tag array\n");
207                                 spin_unlock_irqrestore(&c->lock, flags);
208                                 return ERR_PTR(-ENOMEM);
209                         }
210                         for (col = 0; col < P9_ROW_MAXTAG; col++) {
211                                 c->reqs[row][col].status = REQ_STATUS_IDLE;
212                                 c->reqs[row][col].tc = NULL;
213                         }
214                         c->max_tag += P9_ROW_MAXTAG;
215                 }
216                 spin_unlock_irqrestore(&c->lock, flags);
217         }
218         row = tag / P9_ROW_MAXTAG;
219         col = tag % P9_ROW_MAXTAG;
220
221         req = &c->reqs[row][col];
222         if (!req->tc) {
223                 req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_NOFS);
224                 if (!req->wq) {
225                         printk(KERN_ERR "Couldn't grow tag array\n");
226                         return ERR_PTR(-ENOMEM);
227                 }
228                 init_waitqueue_head(req->wq);
229                 if ((c->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
230                                 P9_TRANS_PREF_PAYLOAD_SEP) {
231                         int alloc_msize = min(c->msize, 4096);
232                         req->tc = kmalloc(sizeof(struct p9_fcall)+alloc_msize,
233                                           GFP_NOFS);
234                         req->tc->capacity = alloc_msize;
235                         req->rc = kmalloc(sizeof(struct p9_fcall)+alloc_msize,
236                                           GFP_NOFS);
237                         req->rc->capacity = alloc_msize;
238                 } else {
239                         req->tc = kmalloc(sizeof(struct p9_fcall)+c->msize,
240                                           GFP_NOFS);
241                         req->tc->capacity = c->msize;
242                         req->rc = kmalloc(sizeof(struct p9_fcall)+c->msize,
243                                           GFP_NOFS);
244                         req->rc->capacity = c->msize;
245                 }
246                 if ((!req->tc) || (!req->rc)) {
247                         printk(KERN_ERR "Couldn't grow tag array\n");
248                         kfree(req->tc);
249                         kfree(req->rc);
250                         kfree(req->wq);
251                         req->tc = req->rc = NULL;
252                         req->wq = NULL;
253                         return ERR_PTR(-ENOMEM);
254                 }
255                 req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall);
256                 req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall);
257         }
258
259         p9pdu_reset(req->tc);
260         p9pdu_reset(req->rc);
261
262         req->tc->tag = tag-1;
263         req->status = REQ_STATUS_ALLOC;
264
265         return &c->reqs[row][col];
266 }
267
268 /**
269  * p9_tag_lookup - lookup a request by tag
270  * @c: client session to lookup tag within
271  * @tag: numeric id for transaction
272  *
273  */
274
275 struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag)
276 {
277         int row, col;
278
279         /* This looks up the original request by tag so we know which
280          * buffer to read the data into */
281         tag++;
282
283         if(tag >= c->max_tag) 
284                 return NULL;
285
286         row = tag / P9_ROW_MAXTAG;
287         col = tag % P9_ROW_MAXTAG;
288
289         return &c->reqs[row][col];
290 }
291 EXPORT_SYMBOL(p9_tag_lookup);
292
293 /**
294  * p9_tag_init - setup tags structure and contents
295  * @c:  v9fs client struct
296  *
297  * This initializes the tags structure for each client instance.
298  *
299  */
300
301 static int p9_tag_init(struct p9_client *c)
302 {
303         int err = 0;
304
305         c->tagpool = p9_idpool_create();
306         if (IS_ERR(c->tagpool)) {
307                 err = PTR_ERR(c->tagpool);
308                 goto error;
309         }
310         err = p9_idpool_get(c->tagpool); /* reserve tag 0 */
311         if (err < 0) {
312                 p9_idpool_destroy(c->tagpool);
313                 goto error;
314         }
315         c->max_tag = 0;
316 error:
317         return err;
318 }
319
320 /**
321  * p9_tag_cleanup - cleans up tags structure and reclaims resources
322  * @c:  v9fs client struct
323  *
324  * This frees resources associated with the tags structure
325  *
326  */
327 static void p9_tag_cleanup(struct p9_client *c)
328 {
329         int row, col;
330
331         /* check to insure all requests are idle */
332         for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
333                 for (col = 0; col < P9_ROW_MAXTAG; col++) {
334                         if (c->reqs[row][col].status != REQ_STATUS_IDLE) {
335                                 P9_DPRINTK(P9_DEBUG_MUX,
336                                   "Attempting to cleanup non-free tag %d,%d\n",
337                                   row, col);
338                                 /* TODO: delay execution of cleanup */
339                                 return;
340                         }
341                 }
342         }
343
344         if (c->tagpool) {
345                 p9_idpool_put(0, c->tagpool); /* free reserved tag 0 */
346                 p9_idpool_destroy(c->tagpool);
347         }
348
349         /* free requests associated with tags */
350         for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
351                 for (col = 0; col < P9_ROW_MAXTAG; col++) {
352                         kfree(c->reqs[row][col].wq);
353                         kfree(c->reqs[row][col].tc);
354                         kfree(c->reqs[row][col].rc);
355                 }
356                 kfree(c->reqs[row]);
357         }
358         c->max_tag = 0;
359 }
360
361 /**
362  * p9_free_req - free a request and clean-up as necessary
363  * c: client state
364  * r: request to release
365  *
366  */
367
368 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
369 {
370         int tag = r->tc->tag;
371         P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
372
373         r->status = REQ_STATUS_IDLE;
374         if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
375                 p9_idpool_put(tag, c->tagpool);
376 }
377
378 /**
379  * p9_client_cb - call back from transport to client
380  * c: client state
381  * req: request received
382  *
383  */
384 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
385 {
386         P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
387         wake_up(req->wq);
388         P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
389 }
390 EXPORT_SYMBOL(p9_client_cb);
391
392 /**
393  * p9_parse_header - parse header arguments out of a packet
394  * @pdu: packet to parse
395  * @size: size of packet
396  * @type: type of request
397  * @tag: tag of packet
398  * @rewind: set if we need to rewind offset afterwards
399  */
400
401 int
402 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
403                                                                 int rewind)
404 {
405         int8_t r_type;
406         int16_t r_tag;
407         int32_t r_size;
408         int offset = pdu->offset;
409         int err;
410
411         pdu->offset = 0;
412         if (pdu->size == 0)
413                 pdu->size = 7;
414
415         err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
416         if (err)
417                 goto rewind_and_exit;
418
419         pdu->size = r_size;
420         pdu->id = r_type;
421         pdu->tag = r_tag;
422
423         P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size,
424                                                         pdu->id, pdu->tag);
425
426         if (type)
427                 *type = r_type;
428         if (tag)
429                 *tag = r_tag;
430         if (size)
431                 *size = r_size;
432
433
434 rewind_and_exit:
435         if (rewind)
436                 pdu->offset = offset;
437         return err;
438 }
439 EXPORT_SYMBOL(p9_parse_header);
440
441 /**
442  * p9_check_errors - check 9p packet for error return and process it
443  * @c: current client instance
444  * @req: request to parse and check for error conditions
445  *
446  * returns error code if one is discovered, otherwise returns 0
447  *
448  * this will have to be more complicated if we have multiple
449  * error packet types
450  */
451
452 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
453 {
454         int8_t type;
455         int err;
456         int ecode;
457
458         err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
459         if (err) {
460                 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
461                 return err;
462         }
463
464         if (type != P9_RERROR && type != P9_RLERROR)
465                 return 0;
466
467         if (!p9_is_proto_dotl(c)) {
468                 char *ename;
469
470                 if (req->tc->pbuf_size) {
471                         /* Handle user buffers */
472                         size_t len = req->rc->size - req->rc->offset;
473                         if (req->tc->pubuf) {
474                                 /* User Buffer */
475                                 err = copy_from_user(
476                                         &req->rc->sdata[req->rc->offset],
477                                         req->tc->pubuf, len);
478                                 if (err) {
479                                         err = -EFAULT;
480                                         goto out_err;
481                                 }
482                         } else {
483                                 /* Kernel Buffer */
484                                 memmove(&req->rc->sdata[req->rc->offset],
485                                                 req->tc->pkbuf, len);
486                         }
487                 }
488                 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
489                                 &ename, &ecode);
490                 if (err)
491                         goto out_err;
492
493                 if (p9_is_proto_dotu(c))
494                         err = -ecode;
495
496                 if (!err || !IS_ERR_VALUE(err)) {
497                         err = p9_errstr2errno(ename, strlen(ename));
498
499                         P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode,
500                                         ename);
501
502                         kfree(ename);
503                 }
504         } else {
505                 err = p9pdu_readf(req->rc, c->proto_version, "d", &ecode);
506                 err = -ecode;
507
508                 P9_DPRINTK(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode);
509         }
510
511
512         return err;
513
514 out_err:
515         P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n", err);
516
517         return err;
518 }
519
520 static struct p9_req_t *
521 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...);
522
523 /**
524  * p9_client_flush - flush (cancel) a request
525  * @c: client state
526  * @oldreq: request to cancel
527  *
528  * This sents a flush for a particular request and links
529  * the flush request to the original request.  The current
530  * code only supports a single flush request although the protocol
531  * allows for multiple flush requests to be sent for a single request.
532  *
533  */
534
535 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
536 {
537         struct p9_req_t *req;
538         int16_t oldtag;
539         int err;
540
541         err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
542         if (err)
543                 return err;
544
545         P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
546
547         req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
548         if (IS_ERR(req))
549                 return PTR_ERR(req);
550
551
552         /* if we haven't received a response for oldreq,
553            remove it from the list. */
554         spin_lock(&c->lock);
555         if (oldreq->status == REQ_STATUS_FLSH)
556                 list_del(&oldreq->req_list);
557         spin_unlock(&c->lock);
558
559         p9_free_req(c, req);
560         return 0;
561 }
562
563 /**
564  * p9_client_rpc - issue a request and wait for a response
565  * @c: client session
566  * @type: type of request
567  * @fmt: protocol format string (see protocol.c)
568  *
569  * Returns request structure (which client must free using p9_free_req)
570  */
571
572 static struct p9_req_t *
573 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
574 {
575         va_list ap;
576         int tag, err;
577         struct p9_req_t *req;
578         unsigned long flags;
579         int sigpending;
580
581         P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
582
583         /* we allow for any status other than disconnected */
584         if (c->status == Disconnected)
585                 return ERR_PTR(-EIO);
586
587         /* if status is begin_disconnected we allow only clunk request */
588         if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
589                 return ERR_PTR(-EIO);
590
591         if (signal_pending(current)) {
592                 sigpending = 1;
593                 clear_thread_flag(TIF_SIGPENDING);
594         } else
595                 sigpending = 0;
596
597         tag = P9_NOTAG;
598         if (type != P9_TVERSION) {
599                 tag = p9_idpool_get(c->tagpool);
600                 if (tag < 0)
601                         return ERR_PTR(-ENOMEM);
602         }
603
604         req = p9_tag_alloc(c, tag);
605         if (IS_ERR(req))
606                 return req;
607
608         /* marshall the data */
609         p9pdu_prepare(req->tc, tag, type);
610         va_start(ap, fmt);
611         err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
612         va_end(ap);
613         if (err)
614                 goto reterr;
615         p9pdu_finalize(req->tc);
616
617         err = c->trans_mod->request(c, req);
618         if (err < 0) {
619                 if (err != -ERESTARTSYS && err != -EFAULT)
620                         c->status = Disconnected;
621                 goto reterr;
622         }
623
624         P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag);
625         err = wait_event_interruptible(*req->wq,
626                                                 req->status >= REQ_STATUS_RCVD);
627         P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n",
628                                                 req->wq, tag, err);
629
630         if (req->status == REQ_STATUS_ERROR) {
631                 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
632                 err = req->t_err;
633         }
634
635         if ((err == -ERESTARTSYS) && (c->status == Connected)) {
636                 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
637                 sigpending = 1;
638                 clear_thread_flag(TIF_SIGPENDING);
639
640                 if (c->trans_mod->cancel(c, req))
641                         p9_client_flush(c, req);
642
643                 /* if we received the response anyway, don't signal error */
644                 if (req->status == REQ_STATUS_RCVD)
645                         err = 0;
646         }
647
648         if (sigpending) {
649                 spin_lock_irqsave(&current->sighand->siglock, flags);
650                 recalc_sigpending();
651                 spin_unlock_irqrestore(&current->sighand->siglock, flags);
652         }
653
654         if (err < 0)
655                 goto reterr;
656
657         err = p9_check_errors(c, req);
658         if (!err) {
659                 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
660                 return req;
661         }
662
663 reterr:
664         P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
665                                                                         err);
666         p9_free_req(c, req);
667         return ERR_PTR(err);
668 }
669
670 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
671 {
672         int ret;
673         struct p9_fid *fid;
674         unsigned long flags;
675
676         P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
677         fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
678         if (!fid)
679                 return ERR_PTR(-ENOMEM);
680
681         ret = p9_idpool_get(clnt->fidpool);
682         if (ret < 0) {
683                 ret = -ENOSPC;
684                 goto error;
685         }
686         fid->fid = ret;
687
688         memset(&fid->qid, 0, sizeof(struct p9_qid));
689         fid->mode = -1;
690         fid->uid = current_fsuid();
691         fid->clnt = clnt;
692         fid->rdir = NULL;
693         spin_lock_irqsave(&clnt->lock, flags);
694         list_add(&fid->flist, &clnt->fidlist);
695         spin_unlock_irqrestore(&clnt->lock, flags);
696
697         return fid;
698
699 error:
700         kfree(fid);
701         return ERR_PTR(ret);
702 }
703
704 static void p9_fid_destroy(struct p9_fid *fid)
705 {
706         struct p9_client *clnt;
707         unsigned long flags;
708
709         P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
710         clnt = fid->clnt;
711         p9_idpool_put(fid->fid, clnt->fidpool);
712         spin_lock_irqsave(&clnt->lock, flags);
713         list_del(&fid->flist);
714         spin_unlock_irqrestore(&clnt->lock, flags);
715         kfree(fid->rdir);
716         kfree(fid);
717 }
718
719 static int p9_client_version(struct p9_client *c)
720 {
721         int err = 0;
722         struct p9_req_t *req;
723         char *version;
724         int msize;
725
726         P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
727                                                 c->msize, c->proto_version);
728
729         switch (c->proto_version) {
730         case p9_proto_2000L:
731                 req = p9_client_rpc(c, P9_TVERSION, "ds",
732                                         c->msize, "9P2000.L");
733                 break;
734         case p9_proto_2000u:
735                 req = p9_client_rpc(c, P9_TVERSION, "ds",
736                                         c->msize, "9P2000.u");
737                 break;
738         case p9_proto_legacy:
739                 req = p9_client_rpc(c, P9_TVERSION, "ds",
740                                         c->msize, "9P2000");
741                 break;
742         default:
743                 return -EINVAL;
744                 break;
745         }
746
747         if (IS_ERR(req))
748                 return PTR_ERR(req);
749
750         err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
751         if (err) {
752                 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
753                 p9pdu_dump(1, req->rc);
754                 goto error;
755         }
756
757         P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
758         if (!strncmp(version, "9P2000.L", 8))
759                 c->proto_version = p9_proto_2000L;
760         else if (!strncmp(version, "9P2000.u", 8))
761                 c->proto_version = p9_proto_2000u;
762         else if (!strncmp(version, "9P2000", 6))
763                 c->proto_version = p9_proto_legacy;
764         else {
765                 err = -EREMOTEIO;
766                 goto error;
767         }
768
769         if (msize < c->msize)
770                 c->msize = msize;
771
772 error:
773         kfree(version);
774         p9_free_req(c, req);
775
776         return err;
777 }
778
779 struct p9_client *p9_client_create(const char *dev_name, char *options)
780 {
781         int err;
782         struct p9_client *clnt;
783
784         err = 0;
785         clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
786         if (!clnt)
787                 return ERR_PTR(-ENOMEM);
788
789         clnt->trans_mod = NULL;
790         clnt->trans = NULL;
791         spin_lock_init(&clnt->lock);
792         INIT_LIST_HEAD(&clnt->fidlist);
793
794         err = p9_tag_init(clnt);
795         if (err < 0)
796                 goto free_client;
797
798         err = parse_opts(options, clnt);
799         if (err < 0)
800                 goto destroy_tagpool;
801
802         if (!clnt->trans_mod)
803                 clnt->trans_mod = v9fs_get_default_trans();
804
805         if (clnt->trans_mod == NULL) {
806                 err = -EPROTONOSUPPORT;
807                 P9_DPRINTK(P9_DEBUG_ERROR,
808                                 "No transport defined or default transport\n");
809                 goto destroy_tagpool;
810         }
811
812         clnt->fidpool = p9_idpool_create();
813         if (IS_ERR(clnt->fidpool)) {
814                 err = PTR_ERR(clnt->fidpool);
815                 goto put_trans;
816         }
817
818         P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
819                 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
820
821         err = clnt->trans_mod->create(clnt, dev_name, options);
822         if (err)
823                 goto destroy_fidpool;
824
825         if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize)
826                 clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ;
827
828         err = p9_client_version(clnt);
829         if (err)
830                 goto close_trans;
831
832         return clnt;
833
834 close_trans:
835         clnt->trans_mod->close(clnt);
836 destroy_fidpool:
837         p9_idpool_destroy(clnt->fidpool);
838 put_trans:
839         v9fs_put_trans(clnt->trans_mod);
840 destroy_tagpool:
841         p9_idpool_destroy(clnt->tagpool);
842 free_client:
843         kfree(clnt);
844         return ERR_PTR(err);
845 }
846 EXPORT_SYMBOL(p9_client_create);
847
848 void p9_client_destroy(struct p9_client *clnt)
849 {
850         struct p9_fid *fid, *fidptr;
851
852         P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt);
853
854         if (clnt->trans_mod)
855                 clnt->trans_mod->close(clnt);
856
857         v9fs_put_trans(clnt->trans_mod);
858
859         list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
860                 printk(KERN_INFO "Found fid %d not clunked\n", fid->fid);
861                 p9_fid_destroy(fid);
862         }
863
864         if (clnt->fidpool)
865                 p9_idpool_destroy(clnt->fidpool);
866
867         p9_tag_cleanup(clnt);
868
869         kfree(clnt);
870 }
871 EXPORT_SYMBOL(p9_client_destroy);
872
873 void p9_client_disconnect(struct p9_client *clnt)
874 {
875         P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
876         clnt->status = Disconnected;
877 }
878 EXPORT_SYMBOL(p9_client_disconnect);
879
880 void p9_client_begin_disconnect(struct p9_client *clnt)
881 {
882         P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
883         clnt->status = BeginDisconnect;
884 }
885 EXPORT_SYMBOL(p9_client_begin_disconnect);
886
887 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
888         char *uname, u32 n_uname, char *aname)
889 {
890         int err;
891         struct p9_req_t *req;
892         struct p9_fid *fid;
893         struct p9_qid qid;
894
895         P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
896                                         afid ? afid->fid : -1, uname, aname);
897         err = 0;
898
899         fid = p9_fid_create(clnt);
900         if (IS_ERR(fid)) {
901                 err = PTR_ERR(fid);
902                 fid = NULL;
903                 goto error;
904         }
905
906         req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
907                         afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
908         if (IS_ERR(req)) {
909                 err = PTR_ERR(req);
910                 goto error;
911         }
912
913         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
914         if (err) {
915                 p9pdu_dump(1, req->rc);
916                 p9_free_req(clnt, req);
917                 goto error;
918         }
919
920         P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
921                                         qid.type,
922                                         (unsigned long long)qid.path,
923                                         qid.version);
924
925         memmove(&fid->qid, &qid, sizeof(struct p9_qid));
926
927         p9_free_req(clnt, req);
928         return fid;
929
930 error:
931         if (fid)
932                 p9_fid_destroy(fid);
933         return ERR_PTR(err);
934 }
935 EXPORT_SYMBOL(p9_client_attach);
936
937 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname,
938                 char **wnames, int clone)
939 {
940         int err;
941         struct p9_client *clnt;
942         struct p9_fid *fid;
943         struct p9_qid *wqids;
944         struct p9_req_t *req;
945         uint16_t nwqids, count;
946
947         err = 0;
948         wqids = NULL;
949         clnt = oldfid->clnt;
950         if (clone) {
951                 fid = p9_fid_create(clnt);
952                 if (IS_ERR(fid)) {
953                         err = PTR_ERR(fid);
954                         fid = NULL;
955                         goto error;
956                 }
957
958                 fid->uid = oldfid->uid;
959         } else
960                 fid = oldfid;
961
962
963         P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n",
964                 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
965
966         req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
967                                                                 nwname, wnames);
968         if (IS_ERR(req)) {
969                 err = PTR_ERR(req);
970                 goto error;
971         }
972
973         err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
974         if (err) {
975                 p9pdu_dump(1, req->rc);
976                 p9_free_req(clnt, req);
977                 goto clunk_fid;
978         }
979         p9_free_req(clnt, req);
980
981         P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
982
983         if (nwqids != nwname) {
984                 err = -ENOENT;
985                 goto clunk_fid;
986         }
987
988         for (count = 0; count < nwqids; count++)
989                 P9_DPRINTK(P9_DEBUG_9P, "<<<     [%d] %x.%llx.%x\n",
990                         count, wqids[count].type,
991                         (unsigned long long)wqids[count].path,
992                         wqids[count].version);
993
994         if (nwname)
995                 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
996         else
997                 fid->qid = oldfid->qid;
998
999         kfree(wqids);
1000         return fid;
1001
1002 clunk_fid:
1003         kfree(wqids);
1004         p9_client_clunk(fid);
1005         fid = NULL;
1006
1007 error:
1008         if (fid && (fid != oldfid))
1009                 p9_fid_destroy(fid);
1010
1011         return ERR_PTR(err);
1012 }
1013 EXPORT_SYMBOL(p9_client_walk);
1014
1015 int p9_client_open(struct p9_fid *fid, int mode)
1016 {
1017         int err;
1018         struct p9_client *clnt;
1019         struct p9_req_t *req;
1020         struct p9_qid qid;
1021         int iounit;
1022
1023         clnt = fid->clnt;
1024         P9_DPRINTK(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1025                 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1026         err = 0;
1027
1028         if (fid->mode != -1)
1029                 return -EINVAL;
1030
1031         if (p9_is_proto_dotl(clnt))
1032                 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1033         else
1034                 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1035         if (IS_ERR(req)) {
1036                 err = PTR_ERR(req);
1037                 goto error;
1038         }
1039
1040         err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1041         if (err) {
1042                 p9pdu_dump(1, req->rc);
1043                 goto free_and_error;
1044         }
1045
1046         P9_DPRINTK(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1047                 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN",  qid.type,
1048                 (unsigned long long)qid.path, qid.version, iounit);
1049
1050         fid->mode = mode;
1051         fid->iounit = iounit;
1052
1053 free_and_error:
1054         p9_free_req(clnt, req);
1055 error:
1056         return err;
1057 }
1058 EXPORT_SYMBOL(p9_client_open);
1059
1060 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1061                 gid_t gid, struct p9_qid *qid)
1062 {
1063         int err = 0;
1064         struct p9_client *clnt;
1065         struct p9_req_t *req;
1066         int iounit;
1067
1068         P9_DPRINTK(P9_DEBUG_9P,
1069                         ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1070                         ofid->fid, name, flags, mode, gid);
1071         clnt = ofid->clnt;
1072
1073         if (ofid->mode != -1)
1074                 return -EINVAL;
1075
1076         req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags,
1077                         mode, gid);
1078         if (IS_ERR(req)) {
1079                 err = PTR_ERR(req);
1080                 goto error;
1081         }
1082
1083         err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1084         if (err) {
1085                 p9pdu_dump(1, req->rc);
1086                 goto free_and_error;
1087         }
1088
1089         P9_DPRINTK(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1090                         qid->type,
1091                         (unsigned long long)qid->path,
1092                         qid->version, iounit);
1093
1094         ofid->mode = mode;
1095         ofid->iounit = iounit;
1096
1097 free_and_error:
1098         p9_free_req(clnt, req);
1099 error:
1100         return err;
1101 }
1102 EXPORT_SYMBOL(p9_client_create_dotl);
1103
1104 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1105                      char *extension)
1106 {
1107         int err;
1108         struct p9_client *clnt;
1109         struct p9_req_t *req;
1110         struct p9_qid qid;
1111         int iounit;
1112
1113         P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1114                                                 fid->fid, name, perm, mode);
1115         err = 0;
1116         clnt = fid->clnt;
1117
1118         if (fid->mode != -1)
1119                 return -EINVAL;
1120
1121         req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1122                                 mode, extension);
1123         if (IS_ERR(req)) {
1124                 err = PTR_ERR(req);
1125                 goto error;
1126         }
1127
1128         err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1129         if (err) {
1130                 p9pdu_dump(1, req->rc);
1131                 goto free_and_error;
1132         }
1133
1134         P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1135                                 qid.type,
1136                                 (unsigned long long)qid.path,
1137                                 qid.version, iounit);
1138
1139         fid->mode = mode;
1140         fid->iounit = iounit;
1141
1142 free_and_error:
1143         p9_free_req(clnt, req);
1144 error:
1145         return err;
1146 }
1147 EXPORT_SYMBOL(p9_client_fcreate);
1148
1149 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid,
1150                 struct p9_qid *qid)
1151 {
1152         int err = 0;
1153         struct p9_client *clnt;
1154         struct p9_req_t *req;
1155
1156         P9_DPRINTK(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s  symtgt %s\n",
1157                         dfid->fid, name, symtgt);
1158         clnt = dfid->clnt;
1159
1160         req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt,
1161                         gid);
1162         if (IS_ERR(req)) {
1163                 err = PTR_ERR(req);
1164                 goto error;
1165         }
1166
1167         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1168         if (err) {
1169                 p9pdu_dump(1, req->rc);
1170                 goto free_and_error;
1171         }
1172
1173         P9_DPRINTK(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1174                         qid->type, (unsigned long long)qid->path, qid->version);
1175
1176 free_and_error:
1177         p9_free_req(clnt, req);
1178 error:
1179         return err;
1180 }
1181 EXPORT_SYMBOL(p9_client_symlink);
1182
1183 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1184 {
1185         struct p9_client *clnt;
1186         struct p9_req_t *req;
1187
1188         P9_DPRINTK(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1189                         dfid->fid, oldfid->fid, newname);
1190         clnt = dfid->clnt;
1191         req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1192                         newname);
1193         if (IS_ERR(req))
1194                 return PTR_ERR(req);
1195
1196         P9_DPRINTK(P9_DEBUG_9P, "<<< RLINK\n");
1197         p9_free_req(clnt, req);
1198         return 0;
1199 }
1200 EXPORT_SYMBOL(p9_client_link);
1201
1202 int p9_client_fsync(struct p9_fid *fid, int datasync)
1203 {
1204         int err;
1205         struct p9_client *clnt;
1206         struct p9_req_t *req;
1207
1208         P9_DPRINTK(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n",
1209                         fid->fid, datasync);
1210         err = 0;
1211         clnt = fid->clnt;
1212
1213         req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync);
1214         if (IS_ERR(req)) {
1215                 err = PTR_ERR(req);
1216                 goto error;
1217         }
1218
1219         P9_DPRINTK(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid);
1220
1221         p9_free_req(clnt, req);
1222
1223 error:
1224         return err;
1225 }
1226 EXPORT_SYMBOL(p9_client_fsync);
1227
1228 int p9_client_clunk(struct p9_fid *fid)
1229 {
1230         int err;
1231         struct p9_client *clnt;
1232         struct p9_req_t *req;
1233
1234         if (!fid) {
1235                 P9_EPRINTK(KERN_WARNING, "Trying to clunk with NULL fid\n");
1236                 dump_stack();
1237                 return 0;
1238         }
1239
1240         P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
1241         err = 0;
1242         clnt = fid->clnt;
1243
1244         req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1245         if (IS_ERR(req)) {
1246                 err = PTR_ERR(req);
1247                 goto error;
1248         }
1249
1250         P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1251
1252         p9_free_req(clnt, req);
1253         p9_fid_destroy(fid);
1254
1255 error:
1256         return err;
1257 }
1258 EXPORT_SYMBOL(p9_client_clunk);
1259
1260 int p9_client_remove(struct p9_fid *fid)
1261 {
1262         int err;
1263         struct p9_client *clnt;
1264         struct p9_req_t *req;
1265
1266         P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1267         err = 0;
1268         clnt = fid->clnt;
1269
1270         req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1271         if (IS_ERR(req)) {
1272                 err = PTR_ERR(req);
1273                 goto error;
1274         }
1275
1276         P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1277
1278         p9_free_req(clnt, req);
1279 error:
1280         p9_fid_destroy(fid);
1281         return err;
1282 }
1283 EXPORT_SYMBOL(p9_client_remove);
1284
1285 int
1286 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1287                                                                 u32 count)
1288 {
1289         int err, rsize;
1290         struct p9_client *clnt;
1291         struct p9_req_t *req;
1292         char *dataptr;
1293
1294         P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid,
1295                                         (long long unsigned) offset, count);
1296         err = 0;
1297         clnt = fid->clnt;
1298
1299         rsize = fid->iounit;
1300         if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1301                 rsize = clnt->msize - P9_IOHDRSZ;
1302
1303         if (count < rsize)
1304                 rsize = count;
1305
1306         /* Don't bother zerocopy for small IO (< 1024) */
1307         if (((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
1308                         P9_TRANS_PREF_PAYLOAD_SEP) && (rsize > 1024)) {
1309                 req = p9_client_rpc(clnt, P9_TREAD, "dqE", fid->fid, offset,
1310                                 rsize, data, udata);
1311         } else {
1312                 req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset,
1313                                 rsize);
1314         }
1315         if (IS_ERR(req)) {
1316                 err = PTR_ERR(req);
1317                 goto error;
1318         }
1319
1320         err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1321         if (err) {
1322                 p9pdu_dump(1, req->rc);
1323                 goto free_and_error;
1324         }
1325
1326         P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1327
1328         if (!req->tc->pbuf_size) {
1329                 if (data) {
1330                         memmove(data, dataptr, count);
1331                 } else {
1332                         err = copy_to_user(udata, dataptr, count);
1333                         if (err) {
1334                                 err = -EFAULT;
1335                                 goto free_and_error;
1336                         }
1337                 }
1338         }
1339         p9_free_req(clnt, req);
1340         return count;
1341
1342 free_and_error:
1343         p9_free_req(clnt, req);
1344 error:
1345         return err;
1346 }
1347 EXPORT_SYMBOL(p9_client_read);
1348
1349 int
1350 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1351                                                         u64 offset, u32 count)
1352 {
1353         int err, rsize;
1354         struct p9_client *clnt;
1355         struct p9_req_t *req;
1356
1357         P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1358                                 fid->fid, (long long unsigned) offset, count);
1359         err = 0;
1360         clnt = fid->clnt;
1361
1362         rsize = fid->iounit;
1363         if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1364                 rsize = clnt->msize - P9_IOHDRSZ;
1365
1366         if (count < rsize)
1367                 rsize = count;
1368
1369         /* Don't bother zerocopy form small IO (< 1024) */
1370         if (((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
1371                                 P9_TRANS_PREF_PAYLOAD_SEP) && (rsize > 1024)) {
1372                 req = p9_client_rpc(clnt, P9_TWRITE, "dqE", fid->fid, offset,
1373                                 rsize, data, udata);
1374         } else {
1375
1376                 if (data)
1377                         req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid,
1378                                         offset, rsize, data);
1379                 else
1380                         req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid,
1381                                         offset, rsize, udata);
1382         }
1383         if (IS_ERR(req)) {
1384                 err = PTR_ERR(req);
1385                 goto error;
1386         }
1387
1388         err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1389         if (err) {
1390                 p9pdu_dump(1, req->rc);
1391                 goto free_and_error;
1392         }
1393
1394         P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1395
1396         p9_free_req(clnt, req);
1397         return count;
1398
1399 free_and_error:
1400         p9_free_req(clnt, req);
1401 error:
1402         return err;
1403 }
1404 EXPORT_SYMBOL(p9_client_write);
1405
1406 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1407 {
1408         int err;
1409         struct p9_client *clnt;
1410         struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1411         struct p9_req_t *req;
1412         u16 ignored;
1413
1414         P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1415
1416         if (!ret)
1417                 return ERR_PTR(-ENOMEM);
1418
1419         err = 0;
1420         clnt = fid->clnt;
1421
1422         req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1423         if (IS_ERR(req)) {
1424                 err = PTR_ERR(req);
1425                 goto error;
1426         }
1427
1428         err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1429         if (err) {
1430                 p9pdu_dump(1, req->rc);
1431                 p9_free_req(clnt, req);
1432                 goto error;
1433         }
1434
1435         P9_DPRINTK(P9_DEBUG_9P,
1436                 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1437                 "<<<    mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1438                 "<<<    name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1439                 "<<<    uid=%d gid=%d n_muid=%d\n",
1440                 ret->size, ret->type, ret->dev, ret->qid.type,
1441                 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1442                 ret->atime, ret->mtime, (unsigned long long)ret->length,
1443                 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1444                 ret->n_uid, ret->n_gid, ret->n_muid);
1445
1446         p9_free_req(clnt, req);
1447         return ret;
1448
1449 error:
1450         kfree(ret);
1451         return ERR_PTR(err);
1452 }
1453 EXPORT_SYMBOL(p9_client_stat);
1454
1455 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1456                                                         u64 request_mask)
1457 {
1458         int err;
1459         struct p9_client *clnt;
1460         struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1461                                                                 GFP_KERNEL);
1462         struct p9_req_t *req;
1463
1464         P9_DPRINTK(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1465                                                         fid->fid, request_mask);
1466
1467         if (!ret)
1468                 return ERR_PTR(-ENOMEM);
1469
1470         err = 0;
1471         clnt = fid->clnt;
1472
1473         req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1474         if (IS_ERR(req)) {
1475                 err = PTR_ERR(req);
1476                 goto error;
1477         }
1478
1479         err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1480         if (err) {
1481                 p9pdu_dump(1, req->rc);
1482                 p9_free_req(clnt, req);
1483                 goto error;
1484         }
1485
1486         P9_DPRINTK(P9_DEBUG_9P,
1487                 "<<< RGETATTR st_result_mask=%lld\n"
1488                 "<<< qid=%x.%llx.%x\n"
1489                 "<<< st_mode=%8.8x st_nlink=%llu\n"
1490                 "<<< st_uid=%d st_gid=%d\n"
1491                 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1492                 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1493                 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1494                 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1495                 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1496                 "<<< st_gen=%lld st_data_version=%lld",
1497                 ret->st_result_mask, ret->qid.type, ret->qid.path,
1498                 ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid,
1499                 ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize,
1500                 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1501                 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1502                 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1503                 ret->st_gen, ret->st_data_version);
1504
1505         p9_free_req(clnt, req);
1506         return ret;
1507
1508 error:
1509         kfree(ret);
1510         return ERR_PTR(err);
1511 }
1512 EXPORT_SYMBOL(p9_client_getattr_dotl);
1513
1514 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1515 {
1516         int ret;
1517
1518         /* NOTE: size shouldn't include its own length */
1519         /* size[2] type[2] dev[4] qid[13] */
1520         /* mode[4] atime[4] mtime[4] length[8]*/
1521         /* name[s] uid[s] gid[s] muid[s] */
1522         ret = 2+4+13+4+4+4+8+2+2+2+2;
1523
1524         if (wst->name)
1525                 ret += strlen(wst->name);
1526         if (wst->uid)
1527                 ret += strlen(wst->uid);
1528         if (wst->gid)
1529                 ret += strlen(wst->gid);
1530         if (wst->muid)
1531                 ret += strlen(wst->muid);
1532
1533         if ((proto_version == p9_proto_2000u) ||
1534                 (proto_version == p9_proto_2000L)) {
1535                 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1536                 if (wst->extension)
1537                         ret += strlen(wst->extension);
1538         }
1539
1540         return ret;
1541 }
1542
1543 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1544 {
1545         int err;
1546         struct p9_req_t *req;
1547         struct p9_client *clnt;
1548
1549         err = 0;
1550         clnt = fid->clnt;
1551         wst->size = p9_client_statsize(wst, clnt->proto_version);
1552         P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1553         P9_DPRINTK(P9_DEBUG_9P,
1554                 "     sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1555                 "     mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1556                 "     name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1557                 "     uid=%d gid=%d n_muid=%d\n",
1558                 wst->size, wst->type, wst->dev, wst->qid.type,
1559                 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1560                 wst->atime, wst->mtime, (unsigned long long)wst->length,
1561                 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1562                 wst->n_uid, wst->n_gid, wst->n_muid);
1563
1564         req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1565         if (IS_ERR(req)) {
1566                 err = PTR_ERR(req);
1567                 goto error;
1568         }
1569
1570         P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1571
1572         p9_free_req(clnt, req);
1573 error:
1574         return err;
1575 }
1576 EXPORT_SYMBOL(p9_client_wstat);
1577
1578 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1579 {
1580         int err;
1581         struct p9_req_t *req;
1582         struct p9_client *clnt;
1583
1584         err = 0;
1585         clnt = fid->clnt;
1586         P9_DPRINTK(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1587         P9_DPRINTK(P9_DEBUG_9P,
1588                 "    valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1589                 "    atime_sec=%lld atime_nsec=%lld\n"
1590                 "    mtime_sec=%lld mtime_nsec=%lld\n",
1591                 p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid,
1592                 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1593                 p9attr->mtime_sec, p9attr->mtime_nsec);
1594
1595         req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1596
1597         if (IS_ERR(req)) {
1598                 err = PTR_ERR(req);
1599                 goto error;
1600         }
1601         P9_DPRINTK(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1602         p9_free_req(clnt, req);
1603 error:
1604         return err;
1605 }
1606 EXPORT_SYMBOL(p9_client_setattr);
1607
1608 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1609 {
1610         int err;
1611         struct p9_req_t *req;
1612         struct p9_client *clnt;
1613
1614         err = 0;
1615         clnt = fid->clnt;
1616
1617         P9_DPRINTK(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1618
1619         req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1620         if (IS_ERR(req)) {
1621                 err = PTR_ERR(req);
1622                 goto error;
1623         }
1624
1625         err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1626                 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1627                 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1628         if (err) {
1629                 p9pdu_dump(1, req->rc);
1630                 p9_free_req(clnt, req);
1631                 goto error;
1632         }
1633
1634         P9_DPRINTK(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1635                 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1636                 "fsid %llu namelen %ld\n",
1637                 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1638                 sb->blocks, sb->bfree, sb->bavail, sb->files,  sb->ffree,
1639                 sb->fsid, (long int)sb->namelen);
1640
1641         p9_free_req(clnt, req);
1642 error:
1643         return err;
1644 }
1645 EXPORT_SYMBOL(p9_client_statfs);
1646
1647 int p9_client_rename(struct p9_fid *fid, struct p9_fid *newdirfid, char *name)
1648 {
1649         int err;
1650         struct p9_req_t *req;
1651         struct p9_client *clnt;
1652
1653         err = 0;
1654         clnt = fid->clnt;
1655
1656         P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1657                         fid->fid, newdirfid->fid, name);
1658
1659         req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1660                         newdirfid->fid, name);
1661         if (IS_ERR(req)) {
1662                 err = PTR_ERR(req);
1663                 goto error;
1664         }
1665
1666         P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1667
1668         p9_free_req(clnt, req);
1669 error:
1670         return err;
1671 }
1672 EXPORT_SYMBOL(p9_client_rename);
1673
1674 /*
1675  * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1676  */
1677 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1678                                 const char *attr_name, u64 *attr_size)
1679 {
1680         int err;
1681         struct p9_req_t *req;
1682         struct p9_client *clnt;
1683         struct p9_fid *attr_fid;
1684
1685         err = 0;
1686         clnt = file_fid->clnt;
1687         attr_fid = p9_fid_create(clnt);
1688         if (IS_ERR(attr_fid)) {
1689                 err = PTR_ERR(attr_fid);
1690                 attr_fid = NULL;
1691                 goto error;
1692         }
1693         P9_DPRINTK(P9_DEBUG_9P,
1694                 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
1695                 file_fid->fid, attr_fid->fid, attr_name);
1696
1697         req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
1698                         file_fid->fid, attr_fid->fid, attr_name);
1699         if (IS_ERR(req)) {
1700                 err = PTR_ERR(req);
1701                 goto error;
1702         }
1703         err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
1704         if (err) {
1705                 p9pdu_dump(1, req->rc);
1706                 p9_free_req(clnt, req);
1707                 goto clunk_fid;
1708         }
1709         p9_free_req(clnt, req);
1710         P9_DPRINTK(P9_DEBUG_9P, "<<<  RXATTRWALK fid %d size %llu\n",
1711                 attr_fid->fid, *attr_size);
1712         return attr_fid;
1713 clunk_fid:
1714         p9_client_clunk(attr_fid);
1715         attr_fid = NULL;
1716 error:
1717         if (attr_fid && (attr_fid != file_fid))
1718                 p9_fid_destroy(attr_fid);
1719
1720         return ERR_PTR(err);
1721 }
1722 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
1723
1724 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
1725                         u64 attr_size, int flags)
1726 {
1727         int err;
1728         struct p9_req_t *req;
1729         struct p9_client *clnt;
1730
1731         P9_DPRINTK(P9_DEBUG_9P,
1732                 ">>> TXATTRCREATE fid %d name  %s size %lld flag %d\n",
1733                 fid->fid, name, (long long)attr_size, flags);
1734         err = 0;
1735         clnt = fid->clnt;
1736         req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
1737                         fid->fid, name, attr_size, flags);
1738         if (IS_ERR(req)) {
1739                 err = PTR_ERR(req);
1740                 goto error;
1741         }
1742         P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
1743         p9_free_req(clnt, req);
1744 error:
1745         return err;
1746 }
1747 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
1748
1749 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
1750 {
1751         int err, rsize;
1752         struct p9_client *clnt;
1753         struct p9_req_t *req;
1754         char *dataptr;
1755
1756         P9_DPRINTK(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
1757                                 fid->fid, (long long unsigned) offset, count);
1758
1759         err = 0;
1760         clnt = fid->clnt;
1761
1762         rsize = fid->iounit;
1763         if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
1764                 rsize = clnt->msize - P9_READDIRHDRSZ;
1765
1766         if (count < rsize)
1767                 rsize = count;
1768
1769         if ((clnt->trans_mod->pref & P9_TRANS_PREF_PAYLOAD_MASK) ==
1770                         P9_TRANS_PREF_PAYLOAD_SEP) {
1771                 req = p9_client_rpc(clnt, P9_TREADDIR, "dqF", fid->fid,
1772                                 offset, rsize, data);
1773         } else {
1774                 req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid,
1775                                 offset, rsize);
1776         }
1777         if (IS_ERR(req)) {
1778                 err = PTR_ERR(req);
1779                 goto error;
1780         }
1781
1782         err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1783         if (err) {
1784                 p9pdu_dump(1, req->rc);
1785                 goto free_and_error;
1786         }
1787
1788         P9_DPRINTK(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
1789
1790         if (!req->tc->pbuf_size && data)
1791                 memmove(data, dataptr, count);
1792
1793         p9_free_req(clnt, req);
1794         return count;
1795
1796 free_and_error:
1797         p9_free_req(clnt, req);
1798 error:
1799         return err;
1800 }
1801 EXPORT_SYMBOL(p9_client_readdir);
1802
1803 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
1804                         dev_t rdev, gid_t gid, struct p9_qid *qid)
1805 {
1806         int err;
1807         struct p9_client *clnt;
1808         struct p9_req_t *req;
1809
1810         err = 0;
1811         clnt = fid->clnt;
1812         P9_DPRINTK(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
1813                 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
1814         req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode,
1815                 MAJOR(rdev), MINOR(rdev), gid);
1816         if (IS_ERR(req))
1817                 return PTR_ERR(req);
1818
1819         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1820         if (err) {
1821                 p9pdu_dump(1, req->rc);
1822                 goto error;
1823         }
1824         P9_DPRINTK(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
1825                                 (unsigned long long)qid->path, qid->version);
1826
1827 error:
1828         p9_free_req(clnt, req);
1829         return err;
1830
1831 }
1832 EXPORT_SYMBOL(p9_client_mknod_dotl);
1833
1834 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
1835                                 gid_t gid, struct p9_qid *qid)
1836 {
1837         int err;
1838         struct p9_client *clnt;
1839         struct p9_req_t *req;
1840
1841         err = 0;
1842         clnt = fid->clnt;
1843         P9_DPRINTK(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
1844                  fid->fid, name, mode, gid);
1845         req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode,
1846                 gid);
1847         if (IS_ERR(req))
1848                 return PTR_ERR(req);
1849
1850         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1851         if (err) {
1852                 p9pdu_dump(1, req->rc);
1853                 goto error;
1854         }
1855         P9_DPRINTK(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
1856                                 (unsigned long long)qid->path, qid->version);
1857
1858 error:
1859         p9_free_req(clnt, req);
1860         return err;
1861
1862 }
1863 EXPORT_SYMBOL(p9_client_mkdir_dotl);
1864
1865 int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status)
1866 {
1867         int err;
1868         struct p9_client *clnt;
1869         struct p9_req_t *req;
1870
1871         err = 0;
1872         clnt = fid->clnt;
1873         P9_DPRINTK(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d "
1874                         "start %lld length %lld proc_id %d client_id %s\n",
1875                         fid->fid, flock->type, flock->flags, flock->start,
1876                         flock->length, flock->proc_id, flock->client_id);
1877
1878         req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type,
1879                                 flock->flags, flock->start, flock->length,
1880                                         flock->proc_id, flock->client_id);
1881
1882         if (IS_ERR(req))
1883                 return PTR_ERR(req);
1884
1885         err = p9pdu_readf(req->rc, clnt->proto_version, "b", status);
1886         if (err) {
1887                 p9pdu_dump(1, req->rc);
1888                 goto error;
1889         }
1890         P9_DPRINTK(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status);
1891 error:
1892         p9_free_req(clnt, req);
1893         return err;
1894
1895 }
1896 EXPORT_SYMBOL(p9_client_lock_dotl);
1897
1898 int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock)
1899 {
1900         int err;
1901         struct p9_client *clnt;
1902         struct p9_req_t *req;
1903
1904         err = 0;
1905         clnt = fid->clnt;
1906         P9_DPRINTK(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld "
1907                 "length %lld proc_id %d client_id %s\n", fid->fid, glock->type,
1908                 glock->start, glock->length, glock->proc_id, glock->client_id);
1909
1910         req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid,  glock->type,
1911                 glock->start, glock->length, glock->proc_id, glock->client_id);
1912
1913         if (IS_ERR(req))
1914                 return PTR_ERR(req);
1915
1916         err = p9pdu_readf(req->rc, clnt->proto_version, "bqqds", &glock->type,
1917                         &glock->start, &glock->length, &glock->proc_id,
1918                         &glock->client_id);
1919         if (err) {
1920                 p9pdu_dump(1, req->rc);
1921                 goto error;
1922         }
1923         P9_DPRINTK(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld "
1924                 "proc_id %d client_id %s\n", glock->type, glock->start,
1925                 glock->length, glock->proc_id, glock->client_id);
1926 error:
1927         p9_free_req(clnt, req);
1928         return err;
1929 }
1930 EXPORT_SYMBOL(p9_client_getlock_dotl);
1931
1932 int p9_client_readlink(struct p9_fid *fid, char **target)
1933 {
1934         int err;
1935         struct p9_client *clnt;
1936         struct p9_req_t *req;
1937
1938         err = 0;
1939         clnt = fid->clnt;
1940         P9_DPRINTK(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid);
1941
1942         req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid);
1943         if (IS_ERR(req))
1944                 return PTR_ERR(req);
1945
1946         err = p9pdu_readf(req->rc, clnt->proto_version, "s", target);
1947         if (err) {
1948                 p9pdu_dump(1, req->rc);
1949                 goto error;
1950         }
1951         P9_DPRINTK(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target);
1952 error:
1953         p9_free_req(clnt, req);
1954         return err;
1955 }
1956 EXPORT_SYMBOL(p9_client_readlink);