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