net: return operator cleanup
[linux-3.10.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_destroy(c->tagpool);
336
337         /* free requests associated with tags */
338         for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) {
339                 for (col = 0; col < P9_ROW_MAXTAG; col++) {
340                         kfree(c->reqs[row][col].wq);
341                         kfree(c->reqs[row][col].tc);
342                         kfree(c->reqs[row][col].rc);
343                 }
344                 kfree(c->reqs[row]);
345         }
346         c->max_tag = 0;
347 }
348
349 /**
350  * p9_free_req - free a request and clean-up as necessary
351  * c: client state
352  * r: request to release
353  *
354  */
355
356 static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
357 {
358         int tag = r->tc->tag;
359         P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag);
360
361         r->status = REQ_STATUS_IDLE;
362         if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool))
363                 p9_idpool_put(tag, c->tagpool);
364 }
365
366 /**
367  * p9_client_cb - call back from transport to client
368  * c: client state
369  * req: request received
370  *
371  */
372 void p9_client_cb(struct p9_client *c, struct p9_req_t *req)
373 {
374         P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag);
375         wake_up(req->wq);
376         P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag);
377 }
378 EXPORT_SYMBOL(p9_client_cb);
379
380 /**
381  * p9_parse_header - parse header arguments out of a packet
382  * @pdu: packet to parse
383  * @size: size of packet
384  * @type: type of request
385  * @tag: tag of packet
386  * @rewind: set if we need to rewind offset afterwards
387  */
388
389 int
390 p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag,
391                                                                 int rewind)
392 {
393         int8_t r_type;
394         int16_t r_tag;
395         int32_t r_size;
396         int offset = pdu->offset;
397         int err;
398
399         pdu->offset = 0;
400         if (pdu->size == 0)
401                 pdu->size = 7;
402
403         err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag);
404         if (err)
405                 goto rewind_and_exit;
406
407         pdu->size = r_size;
408         pdu->id = r_type;
409         pdu->tag = r_tag;
410
411         P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size,
412                                                         pdu->id, pdu->tag);
413
414         if (type)
415                 *type = r_type;
416         if (tag)
417                 *tag = r_tag;
418         if (size)
419                 *size = r_size;
420
421
422 rewind_and_exit:
423         if (rewind)
424                 pdu->offset = offset;
425         return err;
426 }
427 EXPORT_SYMBOL(p9_parse_header);
428
429 /**
430  * p9_check_errors - check 9p packet for error return and process it
431  * @c: current client instance
432  * @req: request to parse and check for error conditions
433  *
434  * returns error code if one is discovered, otherwise returns 0
435  *
436  * this will have to be more complicated if we have multiple
437  * error packet types
438  */
439
440 static int p9_check_errors(struct p9_client *c, struct p9_req_t *req)
441 {
442         int8_t type;
443         int err;
444
445         err = p9_parse_header(req->rc, NULL, &type, NULL, 0);
446         if (err) {
447                 P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err);
448                 return err;
449         }
450
451         if (type == P9_RERROR) {
452                 int ecode;
453                 char *ename;
454
455                 err = p9pdu_readf(req->rc, c->proto_version, "s?d",
456                                                         &ename, &ecode);
457                 if (err) {
458                         P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n",
459                                                                         err);
460                         return err;
461                 }
462
463                 if (p9_is_proto_dotu(c) ||
464                         p9_is_proto_dotl(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         } else
474                 err = 0;
475
476         return err;
477 }
478
479 /**
480  * p9_client_flush - flush (cancel) a request
481  * @c: client state
482  * @oldreq: request to cancel
483  *
484  * This sents a flush for a particular requests and links
485  * the flush request to the original request.  The current
486  * code only supports a single flush request although the protocol
487  * allows for multiple flush requests to be sent for a single request.
488  *
489  */
490
491 static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq)
492 {
493         struct p9_req_t *req;
494         int16_t oldtag;
495         int err;
496
497         err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1);
498         if (err)
499                 return err;
500
501         P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag);
502
503         req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag);
504         if (IS_ERR(req))
505                 return PTR_ERR(req);
506
507
508         /* if we haven't received a response for oldreq,
509            remove it from the list. */
510         spin_lock(&c->lock);
511         if (oldreq->status == REQ_STATUS_FLSH)
512                 list_del(&oldreq->req_list);
513         spin_unlock(&c->lock);
514
515         p9_free_req(c, req);
516         return 0;
517 }
518
519 /**
520  * p9_client_rpc - issue a request and wait for a response
521  * @c: client session
522  * @type: type of request
523  * @fmt: protocol format string (see protocol.c)
524  *
525  * Returns request structure (which client must free using p9_free_req)
526  */
527
528 static struct p9_req_t *
529 p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...)
530 {
531         va_list ap;
532         int tag, err;
533         struct p9_req_t *req;
534         unsigned long flags;
535         int sigpending;
536
537         P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type);
538
539         /* we allow for any status other than disconnected */
540         if (c->status == Disconnected)
541                 return ERR_PTR(-EIO);
542
543         /* if status is begin_disconnected we allow only clunk request */
544         if ((c->status == BeginDisconnect) && (type != P9_TCLUNK))
545                 return ERR_PTR(-EIO);
546
547         if (signal_pending(current)) {
548                 sigpending = 1;
549                 clear_thread_flag(TIF_SIGPENDING);
550         } else
551                 sigpending = 0;
552
553         tag = P9_NOTAG;
554         if (type != P9_TVERSION) {
555                 tag = p9_idpool_get(c->tagpool);
556                 if (tag < 0)
557                         return ERR_PTR(-ENOMEM);
558         }
559
560         req = p9_tag_alloc(c, tag);
561         if (IS_ERR(req))
562                 return req;
563
564         /* marshall the data */
565         p9pdu_prepare(req->tc, tag, type);
566         va_start(ap, fmt);
567         err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap);
568         va_end(ap);
569         p9pdu_finalize(req->tc);
570
571         err = c->trans_mod->request(c, req);
572         if (err < 0) {
573                 c->status = Disconnected;
574                 goto reterr;
575         }
576
577         P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag);
578         err = wait_event_interruptible(*req->wq,
579                                                 req->status >= REQ_STATUS_RCVD);
580         P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n",
581                                                 req->wq, tag, err);
582
583         if (req->status == REQ_STATUS_ERROR) {
584                 P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err);
585                 err = req->t_err;
586         }
587
588         if ((err == -ERESTARTSYS) && (c->status == Connected)) {
589                 P9_DPRINTK(P9_DEBUG_MUX, "flushing\n");
590                 sigpending = 1;
591                 clear_thread_flag(TIF_SIGPENDING);
592
593                 if (c->trans_mod->cancel(c, req))
594                         p9_client_flush(c, req);
595
596                 /* if we received the response anyway, don't signal error */
597                 if (req->status == REQ_STATUS_RCVD)
598                         err = 0;
599         }
600
601         if (sigpending) {
602                 spin_lock_irqsave(&current->sighand->siglock, flags);
603                 recalc_sigpending();
604                 spin_unlock_irqrestore(&current->sighand->siglock, flags);
605         }
606
607         if (err < 0)
608                 goto reterr;
609
610         err = p9_check_errors(c, req);
611         if (!err) {
612                 P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type);
613                 return req;
614         }
615
616 reterr:
617         P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type,
618                                                                         err);
619         p9_free_req(c, req);
620         return ERR_PTR(err);
621 }
622
623 static struct p9_fid *p9_fid_create(struct p9_client *clnt)
624 {
625         int ret;
626         struct p9_fid *fid;
627         unsigned long flags;
628
629         P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt);
630         fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL);
631         if (!fid)
632                 return ERR_PTR(-ENOMEM);
633
634         ret = p9_idpool_get(clnt->fidpool);
635         if (ret < 0) {
636                 ret = -ENOSPC;
637                 goto error;
638         }
639         fid->fid = ret;
640
641         memset(&fid->qid, 0, sizeof(struct p9_qid));
642         fid->mode = -1;
643         fid->uid = current_fsuid();
644         fid->clnt = clnt;
645         fid->rdir = NULL;
646         spin_lock_irqsave(&clnt->lock, flags);
647         list_add(&fid->flist, &clnt->fidlist);
648         spin_unlock_irqrestore(&clnt->lock, flags);
649
650         return fid;
651
652 error:
653         kfree(fid);
654         return ERR_PTR(ret);
655 }
656
657 static void p9_fid_destroy(struct p9_fid *fid)
658 {
659         struct p9_client *clnt;
660         unsigned long flags;
661
662         P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid);
663         clnt = fid->clnt;
664         p9_idpool_put(fid->fid, clnt->fidpool);
665         spin_lock_irqsave(&clnt->lock, flags);
666         list_del(&fid->flist);
667         spin_unlock_irqrestore(&clnt->lock, flags);
668         kfree(fid->rdir);
669         kfree(fid);
670 }
671
672 int p9_client_version(struct p9_client *c)
673 {
674         int err = 0;
675         struct p9_req_t *req;
676         char *version;
677         int msize;
678
679         P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n",
680                                                 c->msize, c->proto_version);
681
682         switch (c->proto_version) {
683         case p9_proto_2000L:
684                 req = p9_client_rpc(c, P9_TVERSION, "ds",
685                                         c->msize, "9P2000.L");
686                 break;
687         case p9_proto_2000u:
688                 req = p9_client_rpc(c, P9_TVERSION, "ds",
689                                         c->msize, "9P2000.u");
690                 break;
691         case p9_proto_legacy:
692                 req = p9_client_rpc(c, P9_TVERSION, "ds",
693                                         c->msize, "9P2000");
694                 break;
695         default:
696                 return -EINVAL;
697                 break;
698         }
699
700         if (IS_ERR(req))
701                 return PTR_ERR(req);
702
703         err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version);
704         if (err) {
705                 P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err);
706                 p9pdu_dump(1, req->rc);
707                 goto error;
708         }
709
710         P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version);
711         if (!strncmp(version, "9P2000.L", 8))
712                 c->proto_version = p9_proto_2000L;
713         else if (!strncmp(version, "9P2000.u", 8))
714                 c->proto_version = p9_proto_2000u;
715         else if (!strncmp(version, "9P2000", 6))
716                 c->proto_version = p9_proto_legacy;
717         else {
718                 err = -EREMOTEIO;
719                 goto error;
720         }
721
722         if (msize < c->msize)
723                 c->msize = msize;
724
725 error:
726         kfree(version);
727         p9_free_req(c, req);
728
729         return err;
730 }
731 EXPORT_SYMBOL(p9_client_version);
732
733 struct p9_client *p9_client_create(const char *dev_name, char *options)
734 {
735         int err;
736         struct p9_client *clnt;
737
738         err = 0;
739         clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL);
740         if (!clnt)
741                 return ERR_PTR(-ENOMEM);
742
743         clnt->trans_mod = NULL;
744         clnt->trans = NULL;
745         spin_lock_init(&clnt->lock);
746         INIT_LIST_HEAD(&clnt->fidlist);
747
748         p9_tag_init(clnt);
749
750         err = parse_opts(options, clnt);
751         if (err < 0)
752                 goto free_client;
753
754         if (!clnt->trans_mod)
755                 clnt->trans_mod = v9fs_get_default_trans();
756
757         if (clnt->trans_mod == NULL) {
758                 err = -EPROTONOSUPPORT;
759                 P9_DPRINTK(P9_DEBUG_ERROR,
760                                 "No transport defined or default transport\n");
761                 goto free_client;
762         }
763
764         clnt->fidpool = p9_idpool_create();
765         if (IS_ERR(clnt->fidpool)) {
766                 err = PTR_ERR(clnt->fidpool);
767                 clnt->fidpool = NULL;
768                 goto put_trans;
769         }
770
771         P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n",
772                 clnt, clnt->trans_mod, clnt->msize, clnt->proto_version);
773
774         err = clnt->trans_mod->create(clnt, dev_name, options);
775         if (err)
776                 goto destroy_fidpool;
777
778         if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize)
779                 clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ;
780
781         err = p9_client_version(clnt);
782         if (err)
783                 goto close_trans;
784
785         return clnt;
786
787 close_trans:
788         clnt->trans_mod->close(clnt);
789 destroy_fidpool:
790         p9_idpool_destroy(clnt->fidpool);
791 put_trans:
792         v9fs_put_trans(clnt->trans_mod);
793 free_client:
794         kfree(clnt);
795         return ERR_PTR(err);
796 }
797 EXPORT_SYMBOL(p9_client_create);
798
799 void p9_client_destroy(struct p9_client *clnt)
800 {
801         struct p9_fid *fid, *fidptr;
802
803         P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt);
804
805         if (clnt->trans_mod)
806                 clnt->trans_mod->close(clnt);
807
808         v9fs_put_trans(clnt->trans_mod);
809
810         list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) {
811                 printk(KERN_INFO "Found fid %d not clunked\n", fid->fid);
812                 p9_fid_destroy(fid);
813         }
814
815         if (clnt->fidpool)
816                 p9_idpool_destroy(clnt->fidpool);
817
818         p9_tag_cleanup(clnt);
819
820         kfree(clnt);
821 }
822 EXPORT_SYMBOL(p9_client_destroy);
823
824 void p9_client_disconnect(struct p9_client *clnt)
825 {
826         P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
827         clnt->status = Disconnected;
828 }
829 EXPORT_SYMBOL(p9_client_disconnect);
830
831 void p9_client_begin_disconnect(struct p9_client *clnt)
832 {
833         P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt);
834         clnt->status = BeginDisconnect;
835 }
836 EXPORT_SYMBOL(p9_client_begin_disconnect);
837
838 struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid,
839         char *uname, u32 n_uname, char *aname)
840 {
841         int err;
842         struct p9_req_t *req;
843         struct p9_fid *fid;
844         struct p9_qid qid;
845
846         P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n",
847                                         afid ? afid->fid : -1, uname, aname);
848         err = 0;
849
850         fid = p9_fid_create(clnt);
851         if (IS_ERR(fid)) {
852                 err = PTR_ERR(fid);
853                 fid = NULL;
854                 goto error;
855         }
856
857         req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid,
858                         afid ? afid->fid : P9_NOFID, uname, aname, n_uname);
859         if (IS_ERR(req)) {
860                 err = PTR_ERR(req);
861                 goto error;
862         }
863
864         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid);
865         if (err) {
866                 p9pdu_dump(1, req->rc);
867                 p9_free_req(clnt, req);
868                 goto error;
869         }
870
871         P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n",
872                                         qid.type,
873                                         (unsigned long long)qid.path,
874                                         qid.version);
875
876         memmove(&fid->qid, &qid, sizeof(struct p9_qid));
877
878         p9_free_req(clnt, req);
879         return fid;
880
881 error:
882         if (fid)
883                 p9_fid_destroy(fid);
884         return ERR_PTR(err);
885 }
886 EXPORT_SYMBOL(p9_client_attach);
887
888 struct p9_fid *
889 p9_client_auth(struct p9_client *clnt, char *uname, u32 n_uname, char *aname)
890 {
891         int err;
892         struct p9_req_t *req;
893         struct p9_qid qid;
894         struct p9_fid *afid;
895
896         P9_DPRINTK(P9_DEBUG_9P, ">>> TAUTH uname %s aname %s\n", uname, aname);
897         err = 0;
898
899         afid = p9_fid_create(clnt);
900         if (IS_ERR(afid)) {
901                 err = PTR_ERR(afid);
902                 afid = NULL;
903                 goto error;
904         }
905
906         req = p9_client_rpc(clnt, P9_TAUTH, "dss?d",
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, "<<< RAUTH qid %x.%llx.%x\n",
921                                         qid.type,
922                                         (unsigned long long)qid.path,
923                                         qid.version);
924
925         memmove(&afid->qid, &qid, sizeof(struct p9_qid));
926         p9_free_req(clnt, req);
927         return afid;
928
929 error:
930         if (afid)
931                 p9_fid_destroy(afid);
932         return ERR_PTR(err);
933 }
934 EXPORT_SYMBOL(p9_client_auth);
935
936 struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames,
937         int clone)
938 {
939         int err;
940         struct p9_client *clnt;
941         struct p9_fid *fid;
942         struct p9_qid *wqids;
943         struct p9_req_t *req;
944         int16_t nwqids, count;
945
946         err = 0;
947         clnt = oldfid->clnt;
948         if (clone) {
949                 fid = p9_fid_create(clnt);
950                 if (IS_ERR(fid)) {
951                         err = PTR_ERR(fid);
952                         fid = NULL;
953                         goto error;
954                 }
955
956                 fid->uid = oldfid->uid;
957         } else
958                 fid = oldfid;
959
960
961         P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n",
962                 oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL);
963
964         req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid,
965                                                                 nwname, wnames);
966         if (IS_ERR(req)) {
967                 err = PTR_ERR(req);
968                 goto error;
969         }
970
971         err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids);
972         if (err) {
973                 p9pdu_dump(1, req->rc);
974                 p9_free_req(clnt, req);
975                 goto clunk_fid;
976         }
977         p9_free_req(clnt, req);
978
979         P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids);
980
981         if (nwqids != nwname) {
982                 err = -ENOENT;
983                 goto clunk_fid;
984         }
985
986         for (count = 0; count < nwqids; count++)
987                 P9_DPRINTK(P9_DEBUG_9P, "<<<     [%d] %x.%llx.%x\n",
988                         count, wqids[count].type,
989                         (unsigned long long)wqids[count].path,
990                         wqids[count].version);
991
992         if (nwname)
993                 memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid));
994         else
995                 fid->qid = oldfid->qid;
996
997         return fid;
998
999 clunk_fid:
1000         p9_client_clunk(fid);
1001         fid = NULL;
1002
1003 error:
1004         if (fid && (fid != oldfid))
1005                 p9_fid_destroy(fid);
1006
1007         return ERR_PTR(err);
1008 }
1009 EXPORT_SYMBOL(p9_client_walk);
1010
1011 int p9_client_open(struct p9_fid *fid, int mode)
1012 {
1013         int err;
1014         struct p9_client *clnt;
1015         struct p9_req_t *req;
1016         struct p9_qid qid;
1017         int iounit;
1018
1019         clnt = fid->clnt;
1020         P9_DPRINTK(P9_DEBUG_9P, ">>> %s fid %d mode %d\n",
1021                 p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode);
1022         err = 0;
1023
1024         if (fid->mode != -1)
1025                 return -EINVAL;
1026
1027         if (p9_is_proto_dotl(clnt))
1028                 req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode);
1029         else
1030                 req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode);
1031         if (IS_ERR(req)) {
1032                 err = PTR_ERR(req);
1033                 goto error;
1034         }
1035
1036         err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1037         if (err) {
1038                 p9pdu_dump(1, req->rc);
1039                 goto free_and_error;
1040         }
1041
1042         P9_DPRINTK(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n",
1043                 p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN",  qid.type,
1044                 (unsigned long long)qid.path, qid.version, iounit);
1045
1046         fid->mode = mode;
1047         fid->iounit = iounit;
1048
1049 free_and_error:
1050         p9_free_req(clnt, req);
1051 error:
1052         return err;
1053 }
1054 EXPORT_SYMBOL(p9_client_open);
1055
1056 int p9_client_create_dotl(struct p9_fid *ofid, char *name, u32 flags, u32 mode,
1057                 gid_t gid, struct p9_qid *qid)
1058 {
1059         int err = 0;
1060         struct p9_client *clnt;
1061         struct p9_req_t *req;
1062         int iounit;
1063
1064         P9_DPRINTK(P9_DEBUG_9P,
1065                         ">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n",
1066                         ofid->fid, name, flags, mode, gid);
1067         clnt = ofid->clnt;
1068
1069         if (ofid->mode != -1)
1070                 return -EINVAL;
1071
1072         req = p9_client_rpc(clnt, P9_TLCREATE, "dsddd", ofid->fid, name, flags,
1073                         mode, gid);
1074         if (IS_ERR(req)) {
1075                 err = PTR_ERR(req);
1076                 goto error;
1077         }
1078
1079         err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", qid, &iounit);
1080         if (err) {
1081                 p9pdu_dump(1, req->rc);
1082                 goto free_and_error;
1083         }
1084
1085         P9_DPRINTK(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n",
1086                         qid->type,
1087                         (unsigned long long)qid->path,
1088                         qid->version, iounit);
1089
1090         ofid->mode = mode;
1091         ofid->iounit = iounit;
1092
1093 free_and_error:
1094         p9_free_req(clnt, req);
1095 error:
1096         return err;
1097 }
1098 EXPORT_SYMBOL(p9_client_create_dotl);
1099
1100 int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode,
1101                      char *extension)
1102 {
1103         int err;
1104         struct p9_client *clnt;
1105         struct p9_req_t *req;
1106         struct p9_qid qid;
1107         int iounit;
1108
1109         P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n",
1110                                                 fid->fid, name, perm, mode);
1111         err = 0;
1112         clnt = fid->clnt;
1113
1114         if (fid->mode != -1)
1115                 return -EINVAL;
1116
1117         req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm,
1118                                 mode, extension);
1119         if (IS_ERR(req)) {
1120                 err = PTR_ERR(req);
1121                 goto error;
1122         }
1123
1124         err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit);
1125         if (err) {
1126                 p9pdu_dump(1, req->rc);
1127                 goto free_and_error;
1128         }
1129
1130         P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n",
1131                                 qid.type,
1132                                 (unsigned long long)qid.path,
1133                                 qid.version, iounit);
1134
1135         fid->mode = mode;
1136         fid->iounit = iounit;
1137
1138 free_and_error:
1139         p9_free_req(clnt, req);
1140 error:
1141         return err;
1142 }
1143 EXPORT_SYMBOL(p9_client_fcreate);
1144
1145 int p9_client_symlink(struct p9_fid *dfid, char *name, char *symtgt, gid_t gid,
1146                 struct p9_qid *qid)
1147 {
1148         int err = 0;
1149         struct p9_client *clnt;
1150         struct p9_req_t *req;
1151
1152         P9_DPRINTK(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s  symtgt %s\n",
1153                         dfid->fid, name, symtgt);
1154         clnt = dfid->clnt;
1155
1156         req = p9_client_rpc(clnt, P9_TSYMLINK, "dssd", dfid->fid, name, symtgt,
1157                         gid);
1158         if (IS_ERR(req)) {
1159                 err = PTR_ERR(req);
1160                 goto error;
1161         }
1162
1163         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1164         if (err) {
1165                 p9pdu_dump(1, req->rc);
1166                 goto free_and_error;
1167         }
1168
1169         P9_DPRINTK(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n",
1170                         qid->type, (unsigned long long)qid->path, qid->version);
1171
1172 free_and_error:
1173         p9_free_req(clnt, req);
1174 error:
1175         return err;
1176 }
1177 EXPORT_SYMBOL(p9_client_symlink);
1178
1179 int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, char *newname)
1180 {
1181         struct p9_client *clnt;
1182         struct p9_req_t *req;
1183
1184         P9_DPRINTK(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n",
1185                         dfid->fid, oldfid->fid, newname);
1186         clnt = dfid->clnt;
1187         req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid,
1188                         newname);
1189         if (IS_ERR(req))
1190                 return PTR_ERR(req);
1191
1192         P9_DPRINTK(P9_DEBUG_9P, "<<< RLINK\n");
1193         p9_free_req(clnt, req);
1194         return 0;
1195 }
1196 EXPORT_SYMBOL(p9_client_link);
1197
1198 int p9_client_clunk(struct p9_fid *fid)
1199 {
1200         int err;
1201         struct p9_client *clnt;
1202         struct p9_req_t *req;
1203
1204         P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid);
1205         err = 0;
1206         clnt = fid->clnt;
1207
1208         req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid);
1209         if (IS_ERR(req)) {
1210                 err = PTR_ERR(req);
1211                 goto error;
1212         }
1213
1214         P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid);
1215
1216         p9_free_req(clnt, req);
1217         p9_fid_destroy(fid);
1218
1219 error:
1220         return err;
1221 }
1222 EXPORT_SYMBOL(p9_client_clunk);
1223
1224 int p9_client_remove(struct p9_fid *fid)
1225 {
1226         int err;
1227         struct p9_client *clnt;
1228         struct p9_req_t *req;
1229
1230         P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid);
1231         err = 0;
1232         clnt = fid->clnt;
1233
1234         req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid);
1235         if (IS_ERR(req)) {
1236                 err = PTR_ERR(req);
1237                 goto error;
1238         }
1239
1240         P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid);
1241
1242         p9_free_req(clnt, req);
1243 error:
1244         p9_fid_destroy(fid);
1245         return err;
1246 }
1247 EXPORT_SYMBOL(p9_client_remove);
1248
1249 int
1250 p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset,
1251                                                                 u32 count)
1252 {
1253         int err, rsize, total;
1254         struct p9_client *clnt;
1255         struct p9_req_t *req;
1256         char *dataptr;
1257
1258         P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid,
1259                                         (long long unsigned) offset, count);
1260         err = 0;
1261         clnt = fid->clnt;
1262         total = 0;
1263
1264         rsize = fid->iounit;
1265         if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1266                 rsize = clnt->msize - P9_IOHDRSZ;
1267
1268         if (count < rsize)
1269                 rsize = count;
1270
1271         req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, rsize);
1272         if (IS_ERR(req)) {
1273                 err = PTR_ERR(req);
1274                 goto error;
1275         }
1276
1277         err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1278         if (err) {
1279                 p9pdu_dump(1, req->rc);
1280                 goto free_and_error;
1281         }
1282
1283         P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count);
1284
1285         if (data) {
1286                 memmove(data, dataptr, count);
1287         }
1288
1289         if (udata) {
1290                 err = copy_to_user(udata, dataptr, count);
1291                 if (err) {
1292                         err = -EFAULT;
1293                         goto free_and_error;
1294                 }
1295         }
1296
1297         p9_free_req(clnt, req);
1298         return count;
1299
1300 free_and_error:
1301         p9_free_req(clnt, req);
1302 error:
1303         return err;
1304 }
1305 EXPORT_SYMBOL(p9_client_read);
1306
1307 int
1308 p9_client_write(struct p9_fid *fid, char *data, const char __user *udata,
1309                                                         u64 offset, u32 count)
1310 {
1311         int err, rsize, total;
1312         struct p9_client *clnt;
1313         struct p9_req_t *req;
1314
1315         P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n",
1316                                 fid->fid, (long long unsigned) offset, count);
1317         err = 0;
1318         clnt = fid->clnt;
1319         total = 0;
1320
1321         rsize = fid->iounit;
1322         if (!rsize || rsize > clnt->msize-P9_IOHDRSZ)
1323                 rsize = clnt->msize - P9_IOHDRSZ;
1324
1325         if (count < rsize)
1326                 rsize = count;
1327         if (data)
1328                 req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, offset,
1329                                                                 rsize, data);
1330         else
1331                 req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, offset,
1332                                                                 rsize, udata);
1333         if (IS_ERR(req)) {
1334                 err = PTR_ERR(req);
1335                 goto error;
1336         }
1337
1338         err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count);
1339         if (err) {
1340                 p9pdu_dump(1, req->rc);
1341                 goto free_and_error;
1342         }
1343
1344         P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
1345
1346         p9_free_req(clnt, req);
1347         return count;
1348
1349 free_and_error:
1350         p9_free_req(clnt, req);
1351 error:
1352         return err;
1353 }
1354 EXPORT_SYMBOL(p9_client_write);
1355
1356 struct p9_wstat *p9_client_stat(struct p9_fid *fid)
1357 {
1358         int err;
1359         struct p9_client *clnt;
1360         struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL);
1361         struct p9_req_t *req;
1362         u16 ignored;
1363
1364         P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid);
1365
1366         if (!ret)
1367                 return ERR_PTR(-ENOMEM);
1368
1369         err = 0;
1370         clnt = fid->clnt;
1371
1372         req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid);
1373         if (IS_ERR(req)) {
1374                 err = PTR_ERR(req);
1375                 goto error;
1376         }
1377
1378         err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret);
1379         if (err) {
1380                 p9pdu_dump(1, req->rc);
1381                 p9_free_req(clnt, req);
1382                 goto error;
1383         }
1384
1385         P9_DPRINTK(P9_DEBUG_9P,
1386                 "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1387                 "<<<    mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1388                 "<<<    name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1389                 "<<<    uid=%d gid=%d n_muid=%d\n",
1390                 ret->size, ret->type, ret->dev, ret->qid.type,
1391                 (unsigned long long)ret->qid.path, ret->qid.version, ret->mode,
1392                 ret->atime, ret->mtime, (unsigned long long)ret->length,
1393                 ret->name, ret->uid, ret->gid, ret->muid, ret->extension,
1394                 ret->n_uid, ret->n_gid, ret->n_muid);
1395
1396         p9_free_req(clnt, req);
1397         return ret;
1398
1399 error:
1400         kfree(ret);
1401         return ERR_PTR(err);
1402 }
1403 EXPORT_SYMBOL(p9_client_stat);
1404
1405 struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid,
1406                                                         u64 request_mask)
1407 {
1408         int err;
1409         struct p9_client *clnt;
1410         struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl),
1411                                                                 GFP_KERNEL);
1412         struct p9_req_t *req;
1413
1414         P9_DPRINTK(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n",
1415                                                         fid->fid, request_mask);
1416
1417         if (!ret)
1418                 return ERR_PTR(-ENOMEM);
1419
1420         err = 0;
1421         clnt = fid->clnt;
1422
1423         req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask);
1424         if (IS_ERR(req)) {
1425                 err = PTR_ERR(req);
1426                 goto error;
1427         }
1428
1429         err = p9pdu_readf(req->rc, clnt->proto_version, "A", ret);
1430         if (err) {
1431                 p9pdu_dump(1, req->rc);
1432                 p9_free_req(clnt, req);
1433                 goto error;
1434         }
1435
1436         P9_DPRINTK(P9_DEBUG_9P,
1437                 "<<< RGETATTR st_result_mask=%lld\n"
1438                 "<<< qid=%x.%llx.%x\n"
1439                 "<<< st_mode=%8.8x st_nlink=%llu\n"
1440                 "<<< st_uid=%d st_gid=%d\n"
1441                 "<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n"
1442                 "<<< st_atime_sec=%lld st_atime_nsec=%lld\n"
1443                 "<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n"
1444                 "<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n"
1445                 "<<< st_btime_sec=%lld st_btime_nsec=%lld\n"
1446                 "<<< st_gen=%lld st_data_version=%lld",
1447                 ret->st_result_mask, ret->qid.type, ret->qid.path,
1448                 ret->qid.version, ret->st_mode, ret->st_nlink, ret->st_uid,
1449                 ret->st_gid, ret->st_rdev, ret->st_size, ret->st_blksize,
1450                 ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec,
1451                 ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec,
1452                 ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec,
1453                 ret->st_gen, ret->st_data_version);
1454
1455         p9_free_req(clnt, req);
1456         return ret;
1457
1458 error:
1459         kfree(ret);
1460         return ERR_PTR(err);
1461 }
1462 EXPORT_SYMBOL(p9_client_getattr_dotl);
1463
1464 static int p9_client_statsize(struct p9_wstat *wst, int proto_version)
1465 {
1466         int ret;
1467
1468         /* NOTE: size shouldn't include its own length */
1469         /* size[2] type[2] dev[4] qid[13] */
1470         /* mode[4] atime[4] mtime[4] length[8]*/
1471         /* name[s] uid[s] gid[s] muid[s] */
1472         ret = 2+4+13+4+4+4+8+2+2+2+2;
1473
1474         if (wst->name)
1475                 ret += strlen(wst->name);
1476         if (wst->uid)
1477                 ret += strlen(wst->uid);
1478         if (wst->gid)
1479                 ret += strlen(wst->gid);
1480         if (wst->muid)
1481                 ret += strlen(wst->muid);
1482
1483         if ((proto_version == p9_proto_2000u) ||
1484                 (proto_version == p9_proto_2000L)) {
1485                 ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */
1486                 if (wst->extension)
1487                         ret += strlen(wst->extension);
1488         }
1489
1490         return ret;
1491 }
1492
1493 int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst)
1494 {
1495         int err;
1496         struct p9_req_t *req;
1497         struct p9_client *clnt;
1498
1499         err = 0;
1500         clnt = fid->clnt;
1501         wst->size = p9_client_statsize(wst, clnt->proto_version);
1502         P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid);
1503         P9_DPRINTK(P9_DEBUG_9P,
1504                 "     sz=%x type=%x dev=%x qid=%x.%llx.%x\n"
1505                 "     mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n"
1506                 "     name=%s uid=%s gid=%s muid=%s extension=(%s)\n"
1507                 "     uid=%d gid=%d n_muid=%d\n",
1508                 wst->size, wst->type, wst->dev, wst->qid.type,
1509                 (unsigned long long)wst->qid.path, wst->qid.version, wst->mode,
1510                 wst->atime, wst->mtime, (unsigned long long)wst->length,
1511                 wst->name, wst->uid, wst->gid, wst->muid, wst->extension,
1512                 wst->n_uid, wst->n_gid, wst->n_muid);
1513
1514         req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst);
1515         if (IS_ERR(req)) {
1516                 err = PTR_ERR(req);
1517                 goto error;
1518         }
1519
1520         P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid);
1521
1522         p9_free_req(clnt, req);
1523 error:
1524         return err;
1525 }
1526 EXPORT_SYMBOL(p9_client_wstat);
1527
1528 int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr)
1529 {
1530         int err;
1531         struct p9_req_t *req;
1532         struct p9_client *clnt;
1533
1534         err = 0;
1535         clnt = fid->clnt;
1536         P9_DPRINTK(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid);
1537         P9_DPRINTK(P9_DEBUG_9P,
1538                 "    valid=%x mode=%x uid=%d gid=%d size=%lld\n"
1539                 "    atime_sec=%lld atime_nsec=%lld\n"
1540                 "    mtime_sec=%lld mtime_nsec=%lld\n",
1541                 p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid,
1542                 p9attr->size, p9attr->atime_sec, p9attr->atime_nsec,
1543                 p9attr->mtime_sec, p9attr->mtime_nsec);
1544
1545         req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr);
1546
1547         if (IS_ERR(req)) {
1548                 err = PTR_ERR(req);
1549                 goto error;
1550         }
1551         P9_DPRINTK(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid);
1552         p9_free_req(clnt, req);
1553 error:
1554         return err;
1555 }
1556 EXPORT_SYMBOL(p9_client_setattr);
1557
1558 int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb)
1559 {
1560         int err;
1561         struct p9_req_t *req;
1562         struct p9_client *clnt;
1563
1564         err = 0;
1565         clnt = fid->clnt;
1566
1567         P9_DPRINTK(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid);
1568
1569         req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid);
1570         if (IS_ERR(req)) {
1571                 err = PTR_ERR(req);
1572                 goto error;
1573         }
1574
1575         err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type,
1576                 &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail,
1577                 &sb->files, &sb->ffree, &sb->fsid, &sb->namelen);
1578         if (err) {
1579                 p9pdu_dump(1, req->rc);
1580                 p9_free_req(clnt, req);
1581                 goto error;
1582         }
1583
1584         P9_DPRINTK(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld "
1585                 "blocks %llu bfree %llu bavail %llu files %llu ffree %llu "
1586                 "fsid %llu namelen %ld\n",
1587                 fid->fid, (long unsigned int)sb->type, (long int)sb->bsize,
1588                 sb->blocks, sb->bfree, sb->bavail, sb->files,  sb->ffree,
1589                 sb->fsid, (long int)sb->namelen);
1590
1591         p9_free_req(clnt, req);
1592 error:
1593         return err;
1594 }
1595 EXPORT_SYMBOL(p9_client_statfs);
1596
1597 int p9_client_rename(struct p9_fid *fid, struct p9_fid *newdirfid, char *name)
1598 {
1599         int err;
1600         struct p9_req_t *req;
1601         struct p9_client *clnt;
1602
1603         err = 0;
1604         clnt = fid->clnt;
1605
1606         P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n",
1607                         fid->fid, newdirfid->fid, name);
1608
1609         req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid,
1610                         newdirfid->fid, name);
1611         if (IS_ERR(req)) {
1612                 err = PTR_ERR(req);
1613                 goto error;
1614         }
1615
1616         P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid);
1617
1618         p9_free_req(clnt, req);
1619 error:
1620         return err;
1621 }
1622 EXPORT_SYMBOL(p9_client_rename);
1623
1624 /*
1625  * An xattrwalk without @attr_name gives the fid for the lisxattr namespace
1626  */
1627 struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid,
1628                                 const char *attr_name, u64 *attr_size)
1629 {
1630         int err;
1631         struct p9_req_t *req;
1632         struct p9_client *clnt;
1633         struct p9_fid *attr_fid;
1634
1635         err = 0;
1636         clnt = file_fid->clnt;
1637         attr_fid = p9_fid_create(clnt);
1638         if (IS_ERR(attr_fid)) {
1639                 err = PTR_ERR(attr_fid);
1640                 attr_fid = NULL;
1641                 goto error;
1642         }
1643         P9_DPRINTK(P9_DEBUG_9P,
1644                 ">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n",
1645                 file_fid->fid, attr_fid->fid, attr_name);
1646
1647         req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds",
1648                         file_fid->fid, attr_fid->fid, attr_name);
1649         if (IS_ERR(req)) {
1650                 err = PTR_ERR(req);
1651                 goto error;
1652         }
1653         err = p9pdu_readf(req->rc, clnt->proto_version, "q", attr_size);
1654         if (err) {
1655                 p9pdu_dump(1, req->rc);
1656                 p9_free_req(clnt, req);
1657                 goto clunk_fid;
1658         }
1659         p9_free_req(clnt, req);
1660         P9_DPRINTK(P9_DEBUG_9P, "<<<  RXATTRWALK fid %d size %llu\n",
1661                 attr_fid->fid, *attr_size);
1662         return attr_fid;
1663 clunk_fid:
1664         p9_client_clunk(attr_fid);
1665         attr_fid = NULL;
1666 error:
1667         if (attr_fid && (attr_fid != file_fid))
1668                 p9_fid_destroy(attr_fid);
1669
1670         return ERR_PTR(err);
1671 }
1672 EXPORT_SYMBOL_GPL(p9_client_xattrwalk);
1673
1674 int p9_client_xattrcreate(struct p9_fid *fid, const char *name,
1675                         u64 attr_size, int flags)
1676 {
1677         int err;
1678         struct p9_req_t *req;
1679         struct p9_client *clnt;
1680
1681         P9_DPRINTK(P9_DEBUG_9P,
1682                 ">>> TXATTRCREATE fid %d name  %s size %lld flag %d\n",
1683                 fid->fid, name, (long long)attr_size, flags);
1684         err = 0;
1685         clnt = fid->clnt;
1686         req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd",
1687                         fid->fid, name, attr_size, flags);
1688         if (IS_ERR(req)) {
1689                 err = PTR_ERR(req);
1690                 goto error;
1691         }
1692         P9_DPRINTK(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid);
1693         p9_free_req(clnt, req);
1694 error:
1695         return err;
1696 }
1697 EXPORT_SYMBOL_GPL(p9_client_xattrcreate);
1698
1699 int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset)
1700 {
1701         int err, rsize, total;
1702         struct p9_client *clnt;
1703         struct p9_req_t *req;
1704         char *dataptr;
1705
1706         P9_DPRINTK(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n",
1707                                 fid->fid, (long long unsigned) offset, count);
1708
1709         err = 0;
1710         clnt = fid->clnt;
1711         total = 0;
1712
1713         rsize = fid->iounit;
1714         if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ)
1715                 rsize = clnt->msize - P9_READDIRHDRSZ;
1716
1717         if (count < rsize)
1718                 rsize = count;
1719
1720         req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, offset, rsize);
1721         if (IS_ERR(req)) {
1722                 err = PTR_ERR(req);
1723                 goto error;
1724         }
1725
1726         err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr);
1727         if (err) {
1728                 p9pdu_dump(1, req->rc);
1729                 goto free_and_error;
1730         }
1731
1732         P9_DPRINTK(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count);
1733
1734         if (data)
1735                 memmove(data, dataptr, count);
1736
1737         p9_free_req(clnt, req);
1738         return count;
1739
1740 free_and_error:
1741         p9_free_req(clnt, req);
1742 error:
1743         return err;
1744 }
1745 EXPORT_SYMBOL(p9_client_readdir);
1746
1747 int p9_client_mknod_dotl(struct p9_fid *fid, char *name, int mode,
1748                         dev_t rdev, gid_t gid, struct p9_qid *qid)
1749 {
1750         int err;
1751         struct p9_client *clnt;
1752         struct p9_req_t *req;
1753
1754         err = 0;
1755         clnt = fid->clnt;
1756         P9_DPRINTK(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d "
1757                 "minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev));
1758         req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddd", fid->fid, name, mode,
1759                 MAJOR(rdev), MINOR(rdev), gid);
1760         if (IS_ERR(req))
1761                 return PTR_ERR(req);
1762
1763         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1764         if (err) {
1765                 p9pdu_dump(1, req->rc);
1766                 goto error;
1767         }
1768         P9_DPRINTK(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type,
1769                                 (unsigned long long)qid->path, qid->version);
1770
1771 error:
1772         p9_free_req(clnt, req);
1773         return err;
1774
1775 }
1776 EXPORT_SYMBOL(p9_client_mknod_dotl);
1777
1778 int p9_client_mkdir_dotl(struct p9_fid *fid, char *name, int mode,
1779                                 gid_t gid, struct p9_qid *qid)
1780 {
1781         int err;
1782         struct p9_client *clnt;
1783         struct p9_req_t *req;
1784
1785         err = 0;
1786         clnt = fid->clnt;
1787         P9_DPRINTK(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n",
1788                  fid->fid, name, mode, gid);
1789         req = p9_client_rpc(clnt, P9_TMKDIR, "dsdd", fid->fid, name, mode,
1790                 gid);
1791         if (IS_ERR(req))
1792                 return PTR_ERR(req);
1793
1794         err = p9pdu_readf(req->rc, clnt->proto_version, "Q", qid);
1795         if (err) {
1796                 p9pdu_dump(1, req->rc);
1797                 goto error;
1798         }
1799         P9_DPRINTK(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type,
1800                                 (unsigned long long)qid->path, qid->version);
1801
1802 error:
1803         p9_free_req(clnt, req);
1804         return err;
1805
1806 }
1807 EXPORT_SYMBOL(p9_client_mkdir_dotl);