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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 | err = -ecode; | |
465 | ||
466 | if (!err || !IS_ERR_VALUE(err)) | |
467 | err = p9_errstr2errno(ename, strlen(ename)); | |
468 | ||
469 | P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode, ename); | |
470 | ||
471 | kfree(ename); | |
472 | } else | |
473 | err = 0; | |
474 | ||
475 | return err; | |
476 | } | |
477 | ||
478 | /** | |
479 | * p9_client_flush - flush (cancel) a request | |
480 | * @c: client state | |
481 | * @oldreq: request to cancel | |
482 | * | |
483 | * This sents a flush for a particular requests and links | |
484 | * the flush request to the original request. The current | |
485 | * code only supports a single flush request although the protocol | |
486 | * allows for multiple flush requests to be sent for a single request. | |
487 | * | |
488 | */ | |
489 | ||
490 | static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) | |
491 | { | |
492 | struct p9_req_t *req; | |
493 | int16_t oldtag; | |
494 | int err; | |
495 | ||
496 | err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1); | |
497 | if (err) | |
498 | return err; | |
499 | ||
500 | P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); | |
501 | ||
502 | req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); | |
503 | if (IS_ERR(req)) | |
504 | return PTR_ERR(req); | |
505 | ||
506 | ||
507 | /* if we haven't received a response for oldreq, | |
508 | remove it from the list. */ | |
509 | spin_lock(&c->lock); | |
510 | if (oldreq->status == REQ_STATUS_FLSH) | |
511 | list_del(&oldreq->req_list); | |
512 | spin_unlock(&c->lock); | |
513 | ||
514 | p9_free_req(c, req); | |
515 | return 0; | |
516 | } | |
517 | ||
518 | /** | |
519 | * p9_client_rpc - issue a request and wait for a response | |
520 | * @c: client session | |
521 | * @type: type of request | |
522 | * @fmt: protocol format string (see protocol.c) | |
523 | * | |
524 | * Returns request structure (which client must free using p9_free_req) | |
525 | */ | |
526 | ||
527 | static struct p9_req_t * | |
528 | p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) | |
529 | { | |
530 | va_list ap; | |
531 | int tag, err; | |
532 | struct p9_req_t *req; | |
533 | unsigned long flags; | |
534 | int sigpending; | |
535 | ||
536 | P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type); | |
537 | ||
538 | /* we allow for any status other than disconnected */ | |
539 | if (c->status == Disconnected) | |
540 | return ERR_PTR(-EIO); | |
541 | ||
542 | /* if status is begin_disconnected we allow only clunk request */ | |
543 | if ((c->status == BeginDisconnect) && (type != P9_TCLUNK)) | |
544 | return ERR_PTR(-EIO); | |
545 | ||
546 | if (signal_pending(current)) { | |
547 | sigpending = 1; | |
548 | clear_thread_flag(TIF_SIGPENDING); | |
549 | } else | |
550 | sigpending = 0; | |
551 | ||
552 | tag = P9_NOTAG; | |
553 | if (type != P9_TVERSION) { | |
554 | tag = p9_idpool_get(c->tagpool); | |
555 | if (tag < 0) | |
556 | return ERR_PTR(-ENOMEM); | |
557 | } | |
558 | ||
559 | req = p9_tag_alloc(c, tag); | |
560 | if (IS_ERR(req)) | |
561 | return req; | |
562 | ||
563 | /* marshall the data */ | |
564 | p9pdu_prepare(req->tc, tag, type); | |
565 | va_start(ap, fmt); | |
566 | err = p9pdu_vwritef(req->tc, c->proto_version, fmt, ap); | |
567 | va_end(ap); | |
568 | p9pdu_finalize(req->tc); | |
569 | ||
570 | err = c->trans_mod->request(c, req); | |
571 | if (err < 0) { | |
572 | c->status = Disconnected; | |
573 | goto reterr; | |
574 | } | |
575 | ||
576 | P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag); | |
577 | err = wait_event_interruptible(*req->wq, | |
578 | req->status >= REQ_STATUS_RCVD); | |
579 | P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n", | |
580 | req->wq, tag, err); | |
581 | ||
582 | if (req->status == REQ_STATUS_ERROR) { | |
583 | P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); | |
584 | err = req->t_err; | |
585 | } | |
586 | ||
587 | if ((err == -ERESTARTSYS) && (c->status == Connected)) { | |
588 | P9_DPRINTK(P9_DEBUG_MUX, "flushing\n"); | |
589 | sigpending = 1; | |
590 | clear_thread_flag(TIF_SIGPENDING); | |
591 | ||
592 | if (c->trans_mod->cancel(c, req)) | |
593 | p9_client_flush(c, req); | |
594 | ||
595 | /* if we received the response anyway, don't signal error */ | |
596 | if (req->status == REQ_STATUS_RCVD) | |
597 | err = 0; | |
598 | } | |
599 | ||
600 | if (sigpending) { | |
601 | spin_lock_irqsave(¤t->sighand->siglock, flags); | |
602 | recalc_sigpending(); | |
603 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); | |
604 | } | |
605 | ||
606 | if (err < 0) | |
607 | goto reterr; | |
608 | ||
609 | err = p9_check_errors(c, req); | |
610 | if (!err) { | |
611 | P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type); | |
612 | return req; | |
613 | } | |
614 | ||
615 | reterr: | |
616 | P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type, | |
617 | err); | |
618 | p9_free_req(c, req); | |
619 | return ERR_PTR(err); | |
620 | } | |
621 | ||
622 | static struct p9_fid *p9_fid_create(struct p9_client *clnt) | |
623 | { | |
624 | int ret; | |
625 | struct p9_fid *fid; | |
626 | unsigned long flags; | |
627 | ||
628 | P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt); | |
629 | fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); | |
630 | if (!fid) | |
631 | return ERR_PTR(-ENOMEM); | |
632 | ||
633 | ret = p9_idpool_get(clnt->fidpool); | |
634 | if (ret < 0) { | |
635 | ret = -ENOSPC; | |
636 | goto error; | |
637 | } | |
638 | fid->fid = ret; | |
639 | ||
640 | memset(&fid->qid, 0, sizeof(struct p9_qid)); | |
641 | fid->mode = -1; | |
642 | fid->uid = current_fsuid(); | |
643 | fid->clnt = clnt; | |
644 | fid->rdir = NULL; | |
645 | spin_lock_irqsave(&clnt->lock, flags); | |
646 | list_add(&fid->flist, &clnt->fidlist); | |
647 | spin_unlock_irqrestore(&clnt->lock, flags); | |
648 | ||
649 | return fid; | |
650 | ||
651 | error: | |
652 | kfree(fid); | |
653 | return ERR_PTR(ret); | |
654 | } | |
655 | ||
656 | static void p9_fid_destroy(struct p9_fid *fid) | |
657 | { | |
658 | struct p9_client *clnt; | |
659 | unsigned long flags; | |
660 | ||
661 | P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid); | |
662 | clnt = fid->clnt; | |
663 | p9_idpool_put(fid->fid, clnt->fidpool); | |
664 | spin_lock_irqsave(&clnt->lock, flags); | |
665 | list_del(&fid->flist); | |
666 | spin_unlock_irqrestore(&clnt->lock, flags); | |
667 | kfree(fid->rdir); | |
668 | kfree(fid); | |
669 | } | |
670 | ||
671 | int p9_client_version(struct p9_client *c) | |
672 | { | |
673 | int err = 0; | |
674 | struct p9_req_t *req; | |
675 | char *version; | |
676 | int msize; | |
677 | ||
678 | P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", | |
679 | c->msize, c->proto_version); | |
680 | ||
681 | switch (c->proto_version) { | |
682 | case p9_proto_2000L: | |
683 | req = p9_client_rpc(c, P9_TVERSION, "ds", | |
684 | c->msize, "9P2000.L"); | |
685 | break; | |
686 | case p9_proto_2000u: | |
687 | req = p9_client_rpc(c, P9_TVERSION, "ds", | |
688 | c->msize, "9P2000.u"); | |
689 | break; | |
690 | case p9_proto_legacy: | |
691 | req = p9_client_rpc(c, P9_TVERSION, "ds", | |
692 | c->msize, "9P2000"); | |
693 | break; | |
694 | default: | |
695 | return -EINVAL; | |
696 | break; | |
697 | } | |
698 | ||
699 | if (IS_ERR(req)) | |
700 | return PTR_ERR(req); | |
701 | ||
702 | err = p9pdu_readf(req->rc, c->proto_version, "ds", &msize, &version); | |
703 | if (err) { | |
704 | P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err); | |
705 | p9pdu_dump(1, req->rc); | |
706 | goto error; | |
707 | } | |
708 | ||
709 | P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); | |
710 | if (!strncmp(version, "9P2000.L", 8)) | |
711 | c->proto_version = p9_proto_2000L; | |
712 | else if (!strncmp(version, "9P2000.u", 8)) | |
713 | c->proto_version = p9_proto_2000u; | |
714 | else if (!strncmp(version, "9P2000", 6)) | |
715 | c->proto_version = p9_proto_legacy; | |
716 | else { | |
717 | err = -EREMOTEIO; | |
718 | goto error; | |
719 | } | |
720 | ||
721 | if (msize < c->msize) | |
722 | c->msize = msize; | |
723 | ||
724 | error: | |
725 | kfree(version); | |
726 | p9_free_req(c, req); | |
727 | ||
728 | return err; | |
729 | } | |
730 | EXPORT_SYMBOL(p9_client_version); | |
731 | ||
732 | struct p9_client *p9_client_create(const char *dev_name, char *options) | |
733 | { | |
734 | int err; | |
735 | struct p9_client *clnt; | |
736 | ||
737 | err = 0; | |
738 | clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); | |
739 | if (!clnt) | |
740 | return ERR_PTR(-ENOMEM); | |
741 | ||
742 | clnt->trans_mod = NULL; | |
743 | clnt->trans = NULL; | |
744 | spin_lock_init(&clnt->lock); | |
745 | INIT_LIST_HEAD(&clnt->fidlist); | |
746 | ||
747 | p9_tag_init(clnt); | |
748 | ||
749 | err = parse_opts(options, clnt); | |
750 | if (err < 0) | |
751 | goto free_client; | |
752 | ||
753 | if (!clnt->trans_mod) | |
754 | clnt->trans_mod = v9fs_get_default_trans(); | |
755 | ||
756 | if (clnt->trans_mod == NULL) { | |
757 | err = -EPROTONOSUPPORT; | |
758 | P9_DPRINTK(P9_DEBUG_ERROR, | |
759 | "No transport defined or default transport\n"); | |
760 | goto free_client; | |
761 | } | |
762 | ||
763 | clnt->fidpool = p9_idpool_create(); | |
764 | if (IS_ERR(clnt->fidpool)) { | |
765 | err = PTR_ERR(clnt->fidpool); | |
766 | clnt->fidpool = NULL; | |
767 | goto put_trans; | |
768 | } | |
769 | ||
770 | P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", | |
771 | clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); | |
772 | ||
773 | err = clnt->trans_mod->create(clnt, dev_name, options); | |
774 | if (err) | |
775 | goto destroy_fidpool; | |
776 | ||
777 | if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize) | |
778 | clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ; | |
779 | ||
780 | err = p9_client_version(clnt); | |
781 | if (err) | |
782 | goto close_trans; | |
783 | ||
784 | return clnt; | |
785 | ||
786 | close_trans: | |
787 | clnt->trans_mod->close(clnt); | |
788 | destroy_fidpool: | |
789 | p9_idpool_destroy(clnt->fidpool); | |
790 | put_trans: | |
791 | v9fs_put_trans(clnt->trans_mod); | |
792 | free_client: | |
793 | kfree(clnt); | |
794 | return ERR_PTR(err); | |
795 | } | |
796 | EXPORT_SYMBOL(p9_client_create); | |
797 | ||
798 | void p9_client_destroy(struct p9_client *clnt) | |
799 | { | |
800 | struct p9_fid *fid, *fidptr; | |
801 | ||
802 | P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt); | |
803 | ||
804 | if (clnt->trans_mod) | |
805 | clnt->trans_mod->close(clnt); | |
806 | ||
807 | v9fs_put_trans(clnt->trans_mod); | |
808 | ||
809 | list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) { | |
810 | printk(KERN_INFO "Found fid %d not clunked\n", fid->fid); | |
811 | p9_fid_destroy(fid); | |
812 | } | |
813 | ||
814 | if (clnt->fidpool) | |
815 | p9_idpool_destroy(clnt->fidpool); | |
816 | ||
817 | p9_tag_cleanup(clnt); | |
818 | ||
819 | kfree(clnt); | |
820 | } | |
821 | EXPORT_SYMBOL(p9_client_destroy); | |
822 | ||
823 | void p9_client_disconnect(struct p9_client *clnt) | |
824 | { | |
825 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); | |
826 | clnt->status = Disconnected; | |
827 | } | |
828 | EXPORT_SYMBOL(p9_client_disconnect); | |
829 | ||
830 | void p9_client_begin_disconnect(struct p9_client *clnt) | |
831 | { | |
832 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); | |
833 | clnt->status = BeginDisconnect; | |
834 | } | |
835 | EXPORT_SYMBOL(p9_client_begin_disconnect); | |
836 | ||
837 | struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, | |
838 | char *uname, u32 n_uname, char *aname) | |
839 | { | |
840 | int err; | |
841 | struct p9_req_t *req; | |
842 | struct p9_fid *fid; | |
843 | struct p9_qid qid; | |
844 | ||
845 | P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", | |
846 | afid ? afid->fid : -1, uname, aname); | |
847 | err = 0; | |
848 | ||
849 | fid = p9_fid_create(clnt); | |
850 | if (IS_ERR(fid)) { | |
851 | err = PTR_ERR(fid); | |
852 | fid = NULL; | |
853 | goto error; | |
854 | } | |
855 | ||
856 | req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid, | |
857 | afid ? afid->fid : P9_NOFID, uname, aname, n_uname); | |
858 | if (IS_ERR(req)) { | |
859 | err = PTR_ERR(req); | |
860 | goto error; | |
861 | } | |
862 | ||
863 | err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid); | |
864 | if (err) { | |
865 | p9pdu_dump(1, req->rc); | |
866 | p9_free_req(clnt, req); | |
867 | goto error; | |
868 | } | |
869 | ||
870 | P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", | |
871 | qid.type, | |
872 | (unsigned long long)qid.path, | |
873 | qid.version); | |
874 | ||
875 | memmove(&fid->qid, &qid, sizeof(struct p9_qid)); | |
876 | ||
877 | p9_free_req(clnt, req); | |
878 | return fid; | |
879 | ||
880 | error: | |
881 | if (fid) | |
882 | p9_fid_destroy(fid); | |
883 | return ERR_PTR(err); | |
884 | } | |
885 | EXPORT_SYMBOL(p9_client_attach); | |
886 | ||
887 | struct p9_fid * | |
888 | p9_client_auth(struct p9_client *clnt, char *uname, u32 n_uname, char *aname) | |
889 | { | |
890 | int err; | |
891 | struct p9_req_t *req; | |
892 | struct p9_qid qid; | |
893 | struct p9_fid *afid; | |
894 | ||
895 | P9_DPRINTK(P9_DEBUG_9P, ">>> TAUTH uname %s aname %s\n", uname, aname); | |
896 | err = 0; | |
897 | ||
898 | afid = p9_fid_create(clnt); | |
899 | if (IS_ERR(afid)) { | |
900 | err = PTR_ERR(afid); | |
901 | afid = NULL; | |
902 | goto error; | |
903 | } | |
904 | ||
905 | req = p9_client_rpc(clnt, P9_TAUTH, "dss?d", | |
906 | afid ? afid->fid : P9_NOFID, uname, aname, n_uname); | |
907 | if (IS_ERR(req)) { | |
908 | err = PTR_ERR(req); | |
909 | goto error; | |
910 | } | |
911 | ||
912 | err = p9pdu_readf(req->rc, clnt->proto_version, "Q", &qid); | |
913 | if (err) { | |
914 | p9pdu_dump(1, req->rc); | |
915 | p9_free_req(clnt, req); | |
916 | goto error; | |
917 | } | |
918 | ||
919 | P9_DPRINTK(P9_DEBUG_9P, "<<< RAUTH qid %x.%llx.%x\n", | |
920 | qid.type, | |
921 | (unsigned long long)qid.path, | |
922 | qid.version); | |
923 | ||
924 | memmove(&afid->qid, &qid, sizeof(struct p9_qid)); | |
925 | p9_free_req(clnt, req); | |
926 | return afid; | |
927 | ||
928 | error: | |
929 | if (afid) | |
930 | p9_fid_destroy(afid); | |
931 | return ERR_PTR(err); | |
932 | } | |
933 | EXPORT_SYMBOL(p9_client_auth); | |
934 | ||
935 | struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames, | |
936 | int clone) | |
937 | { | |
938 | int err; | |
939 | struct p9_client *clnt; | |
940 | struct p9_fid *fid; | |
941 | struct p9_qid *wqids; | |
942 | struct p9_req_t *req; | |
943 | int16_t nwqids, count; | |
944 | ||
945 | err = 0; | |
946 | clnt = oldfid->clnt; | |
947 | if (clone) { | |
948 | fid = p9_fid_create(clnt); | |
949 | if (IS_ERR(fid)) { | |
950 | err = PTR_ERR(fid); | |
951 | fid = NULL; | |
952 | goto error; | |
953 | } | |
954 | ||
955 | fid->uid = oldfid->uid; | |
956 | } else | |
957 | fid = oldfid; | |
958 | ||
959 | ||
960 | P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n", | |
961 | oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); | |
962 | ||
963 | req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, | |
964 | nwname, wnames); | |
965 | if (IS_ERR(req)) { | |
966 | err = PTR_ERR(req); | |
967 | goto error; | |
968 | } | |
969 | ||
970 | err = p9pdu_readf(req->rc, clnt->proto_version, "R", &nwqids, &wqids); | |
971 | if (err) { | |
972 | p9pdu_dump(1, req->rc); | |
973 | p9_free_req(clnt, req); | |
974 | goto clunk_fid; | |
975 | } | |
976 | p9_free_req(clnt, req); | |
977 | ||
978 | P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); | |
979 | ||
980 | if (nwqids != nwname) { | |
981 | err = -ENOENT; | |
982 | goto clunk_fid; | |
983 | } | |
984 | ||
985 | for (count = 0; count < nwqids; count++) | |
986 | P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", | |
987 | count, wqids[count].type, | |
988 | (unsigned long long)wqids[count].path, | |
989 | wqids[count].version); | |
990 | ||
991 | if (nwname) | |
992 | memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); | |
993 | else | |
994 | fid->qid = oldfid->qid; | |
995 | ||
996 | return fid; | |
997 | ||
998 | clunk_fid: | |
999 | p9_client_clunk(fid); | |
1000 | fid = NULL; | |
1001 | ||
1002 | error: | |
1003 | if (fid && (fid != oldfid)) | |
1004 | p9_fid_destroy(fid); | |
1005 | ||
1006 | return ERR_PTR(err); | |
1007 | } | |
1008 | EXPORT_SYMBOL(p9_client_walk); | |
1009 | ||
1010 | int p9_client_open(struct p9_fid *fid, int mode) | |
1011 | { | |
1012 | int err; | |
1013 | struct p9_client *clnt; | |
1014 | struct p9_req_t *req; | |
1015 | struct p9_qid qid; | |
1016 | int iounit; | |
1017 | ||
1018 | P9_DPRINTK(P9_DEBUG_9P, ">>> TOPEN fid %d mode %d\n", fid->fid, mode); | |
1019 | err = 0; | |
1020 | clnt = fid->clnt; | |
1021 | ||
1022 | if (fid->mode != -1) | |
1023 | return -EINVAL; | |
1024 | ||
1025 | req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); | |
1026 | if (IS_ERR(req)) { | |
1027 | err = PTR_ERR(req); | |
1028 | goto error; | |
1029 | } | |
1030 | ||
1031 | err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); | |
1032 | if (err) { | |
1033 | p9pdu_dump(1, req->rc); | |
1034 | goto free_and_error; | |
1035 | } | |
1036 | ||
1037 | P9_DPRINTK(P9_DEBUG_9P, "<<< ROPEN qid %x.%llx.%x iounit %x\n", | |
1038 | qid.type, | |
1039 | (unsigned long long)qid.path, | |
1040 | qid.version, iounit); | |
1041 | ||
1042 | fid->mode = mode; | |
1043 | fid->iounit = iounit; | |
1044 | ||
1045 | free_and_error: | |
1046 | p9_free_req(clnt, req); | |
1047 | error: | |
1048 | return err; | |
1049 | } | |
1050 | EXPORT_SYMBOL(p9_client_open); | |
1051 | ||
1052 | int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode, | |
1053 | char *extension) | |
1054 | { | |
1055 | int err; | |
1056 | struct p9_client *clnt; | |
1057 | struct p9_req_t *req; | |
1058 | struct p9_qid qid; | |
1059 | int iounit; | |
1060 | ||
1061 | P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", | |
1062 | fid->fid, name, perm, mode); | |
1063 | err = 0; | |
1064 | clnt = fid->clnt; | |
1065 | ||
1066 | if (fid->mode != -1) | |
1067 | return -EINVAL; | |
1068 | ||
1069 | req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, | |
1070 | mode, extension); | |
1071 | if (IS_ERR(req)) { | |
1072 | err = PTR_ERR(req); | |
1073 | goto error; | |
1074 | } | |
1075 | ||
1076 | err = p9pdu_readf(req->rc, clnt->proto_version, "Qd", &qid, &iounit); | |
1077 | if (err) { | |
1078 | p9pdu_dump(1, req->rc); | |
1079 | goto free_and_error; | |
1080 | } | |
1081 | ||
1082 | P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", | |
1083 | qid.type, | |
1084 | (unsigned long long)qid.path, | |
1085 | qid.version, iounit); | |
1086 | ||
1087 | fid->mode = mode; | |
1088 | fid->iounit = iounit; | |
1089 | ||
1090 | free_and_error: | |
1091 | p9_free_req(clnt, req); | |
1092 | error: | |
1093 | return err; | |
1094 | } | |
1095 | EXPORT_SYMBOL(p9_client_fcreate); | |
1096 | ||
1097 | int p9_client_clunk(struct p9_fid *fid) | |
1098 | { | |
1099 | int err; | |
1100 | struct p9_client *clnt; | |
1101 | struct p9_req_t *req; | |
1102 | ||
1103 | P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid); | |
1104 | err = 0; | |
1105 | clnt = fid->clnt; | |
1106 | ||
1107 | req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); | |
1108 | if (IS_ERR(req)) { | |
1109 | err = PTR_ERR(req); | |
1110 | goto error; | |
1111 | } | |
1112 | ||
1113 | P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); | |
1114 | ||
1115 | p9_free_req(clnt, req); | |
1116 | p9_fid_destroy(fid); | |
1117 | ||
1118 | error: | |
1119 | return err; | |
1120 | } | |
1121 | EXPORT_SYMBOL(p9_client_clunk); | |
1122 | ||
1123 | int p9_client_remove(struct p9_fid *fid) | |
1124 | { | |
1125 | int err; | |
1126 | struct p9_client *clnt; | |
1127 | struct p9_req_t *req; | |
1128 | ||
1129 | P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); | |
1130 | err = 0; | |
1131 | clnt = fid->clnt; | |
1132 | ||
1133 | req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); | |
1134 | if (IS_ERR(req)) { | |
1135 | err = PTR_ERR(req); | |
1136 | goto error; | |
1137 | } | |
1138 | ||
1139 | P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); | |
1140 | ||
1141 | p9_free_req(clnt, req); | |
1142 | p9_fid_destroy(fid); | |
1143 | ||
1144 | error: | |
1145 | return err; | |
1146 | } | |
1147 | EXPORT_SYMBOL(p9_client_remove); | |
1148 | ||
1149 | int | |
1150 | p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset, | |
1151 | u32 count) | |
1152 | { | |
1153 | int err, rsize, total; | |
1154 | struct p9_client *clnt; | |
1155 | struct p9_req_t *req; | |
1156 | char *dataptr; | |
1157 | ||
1158 | P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid, | |
1159 | (long long unsigned) offset, count); | |
1160 | err = 0; | |
1161 | clnt = fid->clnt; | |
1162 | total = 0; | |
1163 | ||
1164 | rsize = fid->iounit; | |
1165 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) | |
1166 | rsize = clnt->msize - P9_IOHDRSZ; | |
1167 | ||
1168 | if (count < rsize) | |
1169 | rsize = count; | |
1170 | ||
1171 | req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, rsize); | |
1172 | if (IS_ERR(req)) { | |
1173 | err = PTR_ERR(req); | |
1174 | goto error; | |
1175 | } | |
1176 | ||
1177 | err = p9pdu_readf(req->rc, clnt->proto_version, "D", &count, &dataptr); | |
1178 | if (err) { | |
1179 | p9pdu_dump(1, req->rc); | |
1180 | goto free_and_error; | |
1181 | } | |
1182 | ||
1183 | P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count); | |
1184 | ||
1185 | if (data) { | |
1186 | memmove(data, dataptr, count); | |
1187 | } | |
1188 | ||
1189 | if (udata) { | |
1190 | err = copy_to_user(udata, dataptr, count); | |
1191 | if (err) { | |
1192 | err = -EFAULT; | |
1193 | goto free_and_error; | |
1194 | } | |
1195 | } | |
1196 | ||
1197 | p9_free_req(clnt, req); | |
1198 | return count; | |
1199 | ||
1200 | free_and_error: | |
1201 | p9_free_req(clnt, req); | |
1202 | error: | |
1203 | return err; | |
1204 | } | |
1205 | EXPORT_SYMBOL(p9_client_read); | |
1206 | ||
1207 | int | |
1208 | p9_client_write(struct p9_fid *fid, char *data, const char __user *udata, | |
1209 | u64 offset, u32 count) | |
1210 | { | |
1211 | int err, rsize, total; | |
1212 | struct p9_client *clnt; | |
1213 | struct p9_req_t *req; | |
1214 | ||
1215 | P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n", | |
1216 | fid->fid, (long long unsigned) offset, count); | |
1217 | err = 0; | |
1218 | clnt = fid->clnt; | |
1219 | total = 0; | |
1220 | ||
1221 | rsize = fid->iounit; | |
1222 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) | |
1223 | rsize = clnt->msize - P9_IOHDRSZ; | |
1224 | ||
1225 | if (count < rsize) | |
1226 | rsize = count; | |
1227 | if (data) | |
1228 | req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, offset, | |
1229 | rsize, data); | |
1230 | else | |
1231 | req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, offset, | |
1232 | rsize, udata); | |
1233 | if (IS_ERR(req)) { | |
1234 | err = PTR_ERR(req); | |
1235 | goto error; | |
1236 | } | |
1237 | ||
1238 | err = p9pdu_readf(req->rc, clnt->proto_version, "d", &count); | |
1239 | if (err) { | |
1240 | p9pdu_dump(1, req->rc); | |
1241 | goto free_and_error; | |
1242 | } | |
1243 | ||
1244 | P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); | |
1245 | ||
1246 | p9_free_req(clnt, req); | |
1247 | return count; | |
1248 | ||
1249 | free_and_error: | |
1250 | p9_free_req(clnt, req); | |
1251 | error: | |
1252 | return err; | |
1253 | } | |
1254 | EXPORT_SYMBOL(p9_client_write); | |
1255 | ||
1256 | struct p9_wstat *p9_client_stat(struct p9_fid *fid) | |
1257 | { | |
1258 | int err; | |
1259 | struct p9_client *clnt; | |
1260 | struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); | |
1261 | struct p9_req_t *req; | |
1262 | u16 ignored; | |
1263 | ||
1264 | P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); | |
1265 | ||
1266 | if (!ret) | |
1267 | return ERR_PTR(-ENOMEM); | |
1268 | ||
1269 | err = 0; | |
1270 | clnt = fid->clnt; | |
1271 | ||
1272 | req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); | |
1273 | if (IS_ERR(req)) { | |
1274 | err = PTR_ERR(req); | |
1275 | goto error; | |
1276 | } | |
1277 | ||
1278 | err = p9pdu_readf(req->rc, clnt->proto_version, "wS", &ignored, ret); | |
1279 | if (err) { | |
1280 | p9pdu_dump(1, req->rc); | |
1281 | p9_free_req(clnt, req); | |
1282 | goto error; | |
1283 | } | |
1284 | ||
1285 | P9_DPRINTK(P9_DEBUG_9P, | |
1286 | "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" | |
1287 | "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" | |
1288 | "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" | |
1289 | "<<< uid=%d gid=%d n_muid=%d\n", | |
1290 | ret->size, ret->type, ret->dev, ret->qid.type, | |
1291 | (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, | |
1292 | ret->atime, ret->mtime, (unsigned long long)ret->length, | |
1293 | ret->name, ret->uid, ret->gid, ret->muid, ret->extension, | |
1294 | ret->n_uid, ret->n_gid, ret->n_muid); | |
1295 | ||
1296 | p9_free_req(clnt, req); | |
1297 | return ret; | |
1298 | ||
1299 | error: | |
1300 | kfree(ret); | |
1301 | return ERR_PTR(err); | |
1302 | } | |
1303 | EXPORT_SYMBOL(p9_client_stat); | |
1304 | ||
1305 | static int p9_client_statsize(struct p9_wstat *wst, int proto_version) | |
1306 | { | |
1307 | int ret; | |
1308 | ||
1309 | /* NOTE: size shouldn't include its own length */ | |
1310 | /* size[2] type[2] dev[4] qid[13] */ | |
1311 | /* mode[4] atime[4] mtime[4] length[8]*/ | |
1312 | /* name[s] uid[s] gid[s] muid[s] */ | |
1313 | ret = 2+4+13+4+4+4+8+2+2+2+2; | |
1314 | ||
1315 | if (wst->name) | |
1316 | ret += strlen(wst->name); | |
1317 | if (wst->uid) | |
1318 | ret += strlen(wst->uid); | |
1319 | if (wst->gid) | |
1320 | ret += strlen(wst->gid); | |
1321 | if (wst->muid) | |
1322 | ret += strlen(wst->muid); | |
1323 | ||
1324 | if ((proto_version == p9_proto_2000u) || | |
1325 | (proto_version == p9_proto_2000L)) { | |
1326 | ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ | |
1327 | if (wst->extension) | |
1328 | ret += strlen(wst->extension); | |
1329 | } | |
1330 | ||
1331 | return ret; | |
1332 | } | |
1333 | ||
1334 | int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) | |
1335 | { | |
1336 | int err; | |
1337 | struct p9_req_t *req; | |
1338 | struct p9_client *clnt; | |
1339 | ||
1340 | err = 0; | |
1341 | clnt = fid->clnt; | |
1342 | wst->size = p9_client_statsize(wst, clnt->proto_version); | |
1343 | P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); | |
1344 | P9_DPRINTK(P9_DEBUG_9P, | |
1345 | " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" | |
1346 | " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" | |
1347 | " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" | |
1348 | " uid=%d gid=%d n_muid=%d\n", | |
1349 | wst->size, wst->type, wst->dev, wst->qid.type, | |
1350 | (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, | |
1351 | wst->atime, wst->mtime, (unsigned long long)wst->length, | |
1352 | wst->name, wst->uid, wst->gid, wst->muid, wst->extension, | |
1353 | wst->n_uid, wst->n_gid, wst->n_muid); | |
1354 | ||
1355 | req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst); | |
1356 | if (IS_ERR(req)) { | |
1357 | err = PTR_ERR(req); | |
1358 | goto error; | |
1359 | } | |
1360 | ||
1361 | P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); | |
1362 | ||
1363 | p9_free_req(clnt, req); | |
1364 | error: | |
1365 | return err; | |
1366 | } | |
1367 | EXPORT_SYMBOL(p9_client_wstat); | |
1368 | ||
1369 | int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) | |
1370 | { | |
1371 | int err; | |
1372 | struct p9_req_t *req; | |
1373 | struct p9_client *clnt; | |
1374 | ||
1375 | err = 0; | |
1376 | clnt = fid->clnt; | |
1377 | ||
1378 | P9_DPRINTK(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); | |
1379 | ||
1380 | req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); | |
1381 | if (IS_ERR(req)) { | |
1382 | err = PTR_ERR(req); | |
1383 | goto error; | |
1384 | } | |
1385 | ||
1386 | err = p9pdu_readf(req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, | |
1387 | &sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, | |
1388 | &sb->files, &sb->ffree, &sb->fsid, &sb->namelen); | |
1389 | if (err) { | |
1390 | p9pdu_dump(1, req->rc); | |
1391 | p9_free_req(clnt, req); | |
1392 | goto error; | |
1393 | } | |
1394 | ||
1395 | P9_DPRINTK(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld " | |
1396 | "blocks %llu bfree %llu bavail %llu files %llu ffree %llu " | |
1397 | "fsid %llu namelen %ld\n", | |
1398 | fid->fid, (long unsigned int)sb->type, (long int)sb->bsize, | |
1399 | sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree, | |
1400 | sb->fsid, (long int)sb->namelen); | |
1401 | ||
1402 | p9_free_req(clnt, req); | |
1403 | error: | |
1404 | return err; | |
1405 | } | |
1406 | EXPORT_SYMBOL(p9_client_statfs); | |
1407 | ||
1408 | int p9_client_rename(struct p9_fid *fid, struct p9_fid *newdirfid, char *name) | |
1409 | { | |
1410 | int err; | |
1411 | struct p9_req_t *req; | |
1412 | struct p9_client *clnt; | |
1413 | ||
1414 | err = 0; | |
1415 | clnt = fid->clnt; | |
1416 | ||
1417 | P9_DPRINTK(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", | |
1418 | fid->fid, newdirfid->fid, name); | |
1419 | ||
1420 | req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, | |
1421 | newdirfid->fid, name); | |
1422 | if (IS_ERR(req)) { | |
1423 | err = PTR_ERR(req); | |
1424 | goto error; | |
1425 | } | |
1426 | ||
1427 | P9_DPRINTK(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); | |
1428 | ||
1429 | p9_free_req(clnt, req); | |
1430 | error: | |
1431 | return err; | |
1432 | } | |
1433 | EXPORT_SYMBOL(p9_client_rename); | |
1434 |