Commit | Line | Data |
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bd238fb4 LI |
1 | /* |
2 | * net/9p/clnt.c | |
3 | * | |
4 | * 9P Client | |
5 | * | |
8a0dc95f | 6 | * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com> |
bd238fb4 LI |
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> | |
8a0dc95f | 29 | #include <linux/poll.h> |
bd238fb4 LI |
30 | #include <linux/idr.h> |
31 | #include <linux/mutex.h> | |
32 | #include <linux/sched.h> | |
33 | #include <linux/uaccess.h> | |
34 | #include <net/9p/9p.h> | |
fb0466c3 | 35 | #include <linux/parser.h> |
bd238fb4 | 36 | #include <net/9p/client.h> |
8b81ef58 | 37 | #include <net/9p/transport.h> |
51a87c55 | 38 | #include "protocol.h" |
bd238fb4 | 39 | |
8a0dc95f EVH |
40 | /* |
41 | * Client Option Parsing (code inspired by NFS code) | |
42 | * - a little lazy - parse all client options | |
43 | */ | |
44 | ||
45 | enum { | |
46 | Opt_msize, | |
47 | Opt_trans, | |
48 | Opt_legacy, | |
49 | Opt_err, | |
50 | }; | |
51 | ||
a447c093 | 52 | static const match_table_t tokens = { |
8a0dc95f EVH |
53 | {Opt_msize, "msize=%u"}, |
54 | {Opt_legacy, "noextend"}, | |
55 | {Opt_trans, "trans=%s"}, | |
56 | {Opt_err, NULL}, | |
57 | }; | |
58 | ||
51a87c55 EVH |
59 | static struct p9_req_t * |
60 | p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); | |
91b8534f | 61 | |
8a0dc95f EVH |
62 | /** |
63 | * v9fs_parse_options - parse mount options into session structure | |
64 | * @options: options string passed from mount | |
65 | * @v9ses: existing v9fs session information | |
66 | * | |
bb8ffdfc | 67 | * Return 0 upon success, -ERRNO upon failure |
8a0dc95f EVH |
68 | */ |
69 | ||
bb8ffdfc | 70 | static int parse_opts(char *opts, struct p9_client *clnt) |
8a0dc95f | 71 | { |
bb8ffdfc | 72 | char *options; |
8a0dc95f EVH |
73 | char *p; |
74 | substring_t args[MAX_OPT_ARGS]; | |
75 | int option; | |
bb8ffdfc | 76 | int ret = 0; |
8a0dc95f | 77 | |
8a0dc95f EVH |
78 | clnt->dotu = 1; |
79 | clnt->msize = 8192; | |
80 | ||
bb8ffdfc EVH |
81 | if (!opts) |
82 | return 0; | |
83 | ||
84 | options = kstrdup(opts, GFP_KERNEL); | |
85 | if (!options) { | |
86 | P9_DPRINTK(P9_DEBUG_ERROR, | |
87 | "failed to allocate copy of option string\n"); | |
88 | return -ENOMEM; | |
89 | } | |
8a0dc95f EVH |
90 | |
91 | while ((p = strsep(&options, ",")) != NULL) { | |
92 | int token; | |
93 | if (!*p) | |
94 | continue; | |
95 | token = match_token(p, tokens, args); | |
96 | if (token < Opt_trans) { | |
bb8ffdfc EVH |
97 | int r = match_int(&args[0], &option); |
98 | if (r < 0) { | |
8a0dc95f EVH |
99 | P9_DPRINTK(P9_DEBUG_ERROR, |
100 | "integer field, but no integer?\n"); | |
bb8ffdfc | 101 | ret = r; |
8a0dc95f EVH |
102 | continue; |
103 | } | |
104 | } | |
105 | switch (token) { | |
106 | case Opt_msize: | |
107 | clnt->msize = option; | |
108 | break; | |
109 | case Opt_trans: | |
72029fe8 | 110 | clnt->trans_mod = v9fs_get_trans_by_name(&args[0]); |
8a0dc95f EVH |
111 | break; |
112 | case Opt_legacy: | |
113 | clnt->dotu = 0; | |
114 | break; | |
115 | default: | |
116 | continue; | |
117 | } | |
118 | } | |
72029fe8 TH |
119 | |
120 | if (!clnt->trans_mod) | |
121 | clnt->trans_mod = v9fs_get_default_trans(); | |
122 | ||
bb8ffdfc EVH |
123 | kfree(options); |
124 | return ret; | |
8a0dc95f EVH |
125 | } |
126 | ||
fea511a6 EVH |
127 | /** |
128 | * p9_tag_alloc - lookup/allocate a request by tag | |
129 | * @c: client session to lookup tag within | |
130 | * @tag: numeric id for transaction | |
131 | * | |
132 | * this is a simple array lookup, but will grow the | |
133 | * request_slots as necessary to accomodate transaction | |
134 | * ids which did not previously have a slot. | |
135 | * | |
136 | * this code relies on the client spinlock to manage locks, its | |
137 | * possible we should switch to something else, but I'd rather | |
138 | * stick with something low-overhead for the common case. | |
139 | * | |
140 | */ | |
141 | ||
51a87c55 | 142 | static struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag) |
fea511a6 EVH |
143 | { |
144 | unsigned long flags; | |
145 | int row, col; | |
51a87c55 | 146 | struct p9_req_t *req; |
fea511a6 EVH |
147 | |
148 | /* This looks up the original request by tag so we know which | |
149 | * buffer to read the data into */ | |
150 | tag++; | |
151 | ||
152 | if (tag >= c->max_tag) { | |
153 | spin_lock_irqsave(&c->lock, flags); | |
154 | /* check again since original check was outside of lock */ | |
155 | while (tag >= c->max_tag) { | |
156 | row = (tag / P9_ROW_MAXTAG); | |
157 | c->reqs[row] = kcalloc(P9_ROW_MAXTAG, | |
158 | sizeof(struct p9_req_t), GFP_ATOMIC); | |
159 | ||
160 | if (!c->reqs[row]) { | |
161 | printk(KERN_ERR "Couldn't grow tag array\n"); | |
e45c5405 | 162 | spin_unlock_irqrestore(&c->lock, flags); |
51a87c55 | 163 | return ERR_PTR(-ENOMEM); |
fea511a6 EVH |
164 | } |
165 | for (col = 0; col < P9_ROW_MAXTAG; col++) { | |
166 | c->reqs[row][col].status = REQ_STATUS_IDLE; | |
51a87c55 | 167 | c->reqs[row][col].tc = NULL; |
fea511a6 EVH |
168 | } |
169 | c->max_tag += P9_ROW_MAXTAG; | |
170 | } | |
171 | spin_unlock_irqrestore(&c->lock, flags); | |
172 | } | |
173 | row = tag / P9_ROW_MAXTAG; | |
174 | col = tag % P9_ROW_MAXTAG; | |
175 | ||
51a87c55 EVH |
176 | req = &c->reqs[row][col]; |
177 | if (!req->tc) { | |
178 | req->wq = kmalloc(sizeof(wait_queue_head_t), GFP_KERNEL); | |
179 | if (!req->wq) { | |
180 | printk(KERN_ERR "Couldn't grow tag array\n"); | |
181 | return ERR_PTR(-ENOMEM); | |
182 | } | |
183 | init_waitqueue_head(req->wq); | |
184 | req->tc = kmalloc(sizeof(struct p9_fcall)+c->msize, | |
185 | GFP_KERNEL); | |
186 | req->rc = kmalloc(sizeof(struct p9_fcall)+c->msize, | |
187 | GFP_KERNEL); | |
188 | if ((!req->tc) || (!req->rc)) { | |
189 | printk(KERN_ERR "Couldn't grow tag array\n"); | |
190 | kfree(req->tc); | |
191 | kfree(req->rc); | |
45abdf1c TT |
192 | kfree(req->wq); |
193 | req->tc = req->rc = NULL; | |
194 | req->wq = NULL; | |
51a87c55 EVH |
195 | return ERR_PTR(-ENOMEM); |
196 | } | |
197 | req->tc->sdata = (char *) req->tc + sizeof(struct p9_fcall); | |
198 | req->tc->capacity = c->msize; | |
199 | req->rc->sdata = (char *) req->rc + sizeof(struct p9_fcall); | |
200 | req->rc->capacity = c->msize; | |
201 | } | |
202 | ||
203 | p9pdu_reset(req->tc); | |
204 | p9pdu_reset(req->rc); | |
205 | ||
51a87c55 EVH |
206 | req->tc->tag = tag-1; |
207 | req->status = REQ_STATUS_ALLOC; | |
fea511a6 EVH |
208 | |
209 | return &c->reqs[row][col]; | |
210 | } | |
fea511a6 EVH |
211 | |
212 | /** | |
213 | * p9_tag_lookup - lookup a request by tag | |
214 | * @c: client session to lookup tag within | |
215 | * @tag: numeric id for transaction | |
216 | * | |
217 | */ | |
218 | ||
219 | struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) | |
220 | { | |
221 | int row, col; | |
222 | ||
223 | /* This looks up the original request by tag so we know which | |
224 | * buffer to read the data into */ | |
225 | tag++; | |
226 | ||
227 | BUG_ON(tag >= c->max_tag); | |
228 | ||
229 | row = tag / P9_ROW_MAXTAG; | |
230 | col = tag % P9_ROW_MAXTAG; | |
231 | ||
232 | return &c->reqs[row][col]; | |
233 | } | |
234 | EXPORT_SYMBOL(p9_tag_lookup); | |
235 | ||
236 | /** | |
237 | * p9_tag_init - setup tags structure and contents | |
238 | * @tags: tags structure from the client struct | |
239 | * | |
240 | * This initializes the tags structure for each client instance. | |
241 | * | |
242 | */ | |
243 | ||
244 | static int p9_tag_init(struct p9_client *c) | |
245 | { | |
246 | int err = 0; | |
247 | ||
248 | c->tagpool = p9_idpool_create(); | |
249 | if (IS_ERR(c->tagpool)) { | |
250 | err = PTR_ERR(c->tagpool); | |
251 | c->tagpool = NULL; | |
252 | goto error; | |
253 | } | |
254 | ||
255 | p9_idpool_get(c->tagpool); /* reserve tag 0 */ | |
256 | ||
257 | c->max_tag = 0; | |
258 | error: | |
259 | return err; | |
260 | } | |
261 | ||
262 | /** | |
263 | * p9_tag_cleanup - cleans up tags structure and reclaims resources | |
264 | * @tags: tags structure from the client struct | |
265 | * | |
266 | * This frees resources associated with the tags structure | |
267 | * | |
268 | */ | |
269 | static void p9_tag_cleanup(struct p9_client *c) | |
270 | { | |
271 | int row, col; | |
272 | ||
273 | /* check to insure all requests are idle */ | |
274 | for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { | |
275 | for (col = 0; col < P9_ROW_MAXTAG; col++) { | |
276 | if (c->reqs[row][col].status != REQ_STATUS_IDLE) { | |
277 | P9_DPRINTK(P9_DEBUG_MUX, | |
278 | "Attempting to cleanup non-free tag %d,%d\n", | |
279 | row, col); | |
280 | /* TODO: delay execution of cleanup */ | |
281 | return; | |
282 | } | |
283 | } | |
284 | } | |
285 | ||
286 | if (c->tagpool) | |
287 | p9_idpool_destroy(c->tagpool); | |
288 | ||
289 | /* free requests associated with tags */ | |
290 | for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { | |
51a87c55 | 291 | for (col = 0; col < P9_ROW_MAXTAG; col++) { |
fea511a6 | 292 | kfree(c->reqs[row][col].wq); |
51a87c55 EVH |
293 | kfree(c->reqs[row][col].tc); |
294 | kfree(c->reqs[row][col].rc); | |
295 | } | |
fea511a6 EVH |
296 | kfree(c->reqs[row]); |
297 | } | |
298 | c->max_tag = 0; | |
299 | } | |
300 | ||
673d62cd EVH |
301 | /** |
302 | * p9_free_req - free a request and clean-up as necessary | |
303 | * c: client state | |
304 | * r: request to release | |
305 | * | |
306 | */ | |
307 | ||
51a87c55 | 308 | static void p9_free_req(struct p9_client *c, struct p9_req_t *r) |
673d62cd | 309 | { |
51a87c55 EVH |
310 | int tag = r->tc->tag; |
311 | P9_DPRINTK(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag); | |
312 | ||
673d62cd | 313 | r->status = REQ_STATUS_IDLE; |
51a87c55 EVH |
314 | if (tag != P9_NOTAG && p9_idpool_check(tag, c->tagpool)) |
315 | p9_idpool_put(tag, c->tagpool); | |
673d62cd EVH |
316 | } |
317 | ||
91b8534f EVH |
318 | /** |
319 | * p9_client_cb - call back from transport to client | |
320 | * c: client state | |
321 | * req: request received | |
322 | * | |
323 | */ | |
324 | void p9_client_cb(struct p9_client *c, struct p9_req_t *req) | |
325 | { | |
51a87c55 | 326 | P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag); |
1bab88b2 LI |
327 | wake_up(req->wq); |
328 | P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag); | |
91b8534f EVH |
329 | } |
330 | EXPORT_SYMBOL(p9_client_cb); | |
331 | ||
51a87c55 EVH |
332 | /** |
333 | * p9_parse_header - parse header arguments out of a packet | |
334 | * @pdu: packet to parse | |
335 | * @size: size of packet | |
336 | * @type: type of request | |
337 | * @tag: tag of packet | |
338 | * @rewind: set if we need to rewind offset afterwards | |
339 | */ | |
340 | ||
341 | int | |
342 | p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag, | |
343 | int rewind) | |
344 | { | |
345 | int8_t r_type; | |
346 | int16_t r_tag; | |
347 | int32_t r_size; | |
348 | int offset = pdu->offset; | |
349 | int err; | |
350 | ||
351 | pdu->offset = 0; | |
352 | if (pdu->size == 0) | |
353 | pdu->size = 7; | |
354 | ||
355 | err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); | |
356 | if (err) | |
357 | goto rewind_and_exit; | |
358 | ||
359 | pdu->size = r_size; | |
360 | pdu->id = r_type; | |
361 | pdu->tag = r_tag; | |
362 | ||
e7f4b8f1 EVH |
363 | P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size, |
364 | pdu->id, pdu->tag); | |
51a87c55 EVH |
365 | |
366 | if (type) | |
367 | *type = r_type; | |
368 | if (tag) | |
369 | *tag = r_tag; | |
370 | if (size) | |
371 | *size = r_size; | |
372 | ||
373 | ||
374 | rewind_and_exit: | |
375 | if (rewind) | |
376 | pdu->offset = offset; | |
377 | return err; | |
378 | } | |
379 | EXPORT_SYMBOL(p9_parse_header); | |
380 | ||
381 | /** | |
382 | * p9_check_errors - check 9p packet for error return and process it | |
383 | * @c: current client instance | |
384 | * @req: request to parse and check for error conditions | |
385 | * | |
386 | * returns error code if one is discovered, otherwise returns 0 | |
387 | * | |
388 | * this will have to be more complicated if we have multiple | |
389 | * error packet types | |
390 | */ | |
391 | ||
392 | static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) | |
393 | { | |
394 | int8_t type; | |
395 | int err; | |
396 | ||
397 | err = p9_parse_header(req->rc, NULL, &type, NULL, 0); | |
398 | if (err) { | |
399 | P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); | |
400 | return err; | |
401 | } | |
402 | ||
403 | if (type == P9_RERROR) { | |
404 | int ecode; | |
405 | char *ename; | |
406 | ||
407 | err = p9pdu_readf(req->rc, c->dotu, "s?d", &ename, &ecode); | |
408 | if (err) { | |
409 | P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n", | |
410 | err); | |
411 | return err; | |
412 | } | |
413 | ||
414 | if (c->dotu) | |
415 | err = -ecode; | |
416 | ||
417 | if (!err) { | |
418 | err = p9_errstr2errno(ename, strlen(ename)); | |
419 | ||
420 | /* string match failed */ | |
421 | if (!err) | |
422 | err = -ESERVERFAULT; | |
423 | } | |
424 | ||
425 | P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode, ename); | |
426 | ||
427 | kfree(ename); | |
428 | } else | |
429 | err = 0; | |
430 | ||
431 | return err; | |
432 | } | |
433 | ||
434 | /** | |
435 | * p9_client_flush - flush (cancel) a request | |
436 | * c: client state | |
437 | * req: request to cancel | |
438 | * | |
439 | * This sents a flush for a particular requests and links | |
440 | * the flush request to the original request. The current | |
441 | * code only supports a single flush request although the protocol | |
442 | * allows for multiple flush requests to be sent for a single request. | |
443 | * | |
444 | */ | |
445 | ||
446 | static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) | |
447 | { | |
448 | struct p9_req_t *req; | |
449 | int16_t oldtag; | |
450 | int err; | |
451 | ||
452 | err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1); | |
453 | if (err) | |
454 | return err; | |
455 | ||
456 | P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); | |
457 | ||
458 | req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); | |
459 | if (IS_ERR(req)) | |
460 | return PTR_ERR(req); | |
461 | ||
51a87c55 | 462 | |
1bab88b2 LI |
463 | /* if we haven't received a response for oldreq, |
464 | remove it from the list. */ | |
465 | spin_lock(&c->lock); | |
466 | if (oldreq->status == REQ_STATUS_FLSH) | |
467 | list_del(&oldreq->req_list); | |
468 | spin_unlock(&c->lock); | |
469 | ||
470 | p9_free_req(c, req); | |
51a87c55 EVH |
471 | return 0; |
472 | } | |
473 | ||
91b8534f EVH |
474 | /** |
475 | * p9_client_rpc - issue a request and wait for a response | |
476 | * @c: client session | |
51a87c55 EVH |
477 | * @type: type of request |
478 | * @fmt: protocol format string (see protocol.c) | |
91b8534f | 479 | * |
51a87c55 | 480 | * Returns request structure (which client must free using p9_free_req) |
91b8534f EVH |
481 | */ |
482 | ||
51a87c55 EVH |
483 | static struct p9_req_t * |
484 | p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) | |
91b8534f | 485 | { |
51a87c55 EVH |
486 | va_list ap; |
487 | int tag, err; | |
91b8534f EVH |
488 | struct p9_req_t *req; |
489 | unsigned long flags; | |
490 | int sigpending; | |
91b8534f | 491 | |
51a87c55 | 492 | P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type); |
91b8534f EVH |
493 | |
494 | if (c->status != Connected) | |
51a87c55 | 495 | return ERR_PTR(-EIO); |
91b8534f EVH |
496 | |
497 | if (signal_pending(current)) { | |
498 | sigpending = 1; | |
499 | clear_thread_flag(TIF_SIGPENDING); | |
500 | } else | |
501 | sigpending = 0; | |
502 | ||
503 | tag = P9_NOTAG; | |
51a87c55 | 504 | if (type != P9_TVERSION) { |
91b8534f EVH |
505 | tag = p9_idpool_get(c->tagpool); |
506 | if (tag < 0) | |
51a87c55 | 507 | return ERR_PTR(-ENOMEM); |
91b8534f EVH |
508 | } |
509 | ||
510 | req = p9_tag_alloc(c, tag); | |
51a87c55 EVH |
511 | if (IS_ERR(req)) |
512 | return req; | |
91b8534f | 513 | |
51a87c55 EVH |
514 | /* marshall the data */ |
515 | p9pdu_prepare(req->tc, tag, type); | |
516 | va_start(ap, fmt); | |
517 | err = p9pdu_vwritef(req->tc, c->dotu, fmt, ap); | |
518 | va_end(ap); | |
519 | p9pdu_finalize(req->tc); | |
91b8534f EVH |
520 | |
521 | err = c->trans_mod->request(c, req); | |
522 | if (err < 0) { | |
523 | c->status = Disconnected; | |
524 | goto reterr; | |
525 | } | |
526 | ||
51a87c55 | 527 | P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag); |
91b8534f EVH |
528 | err = wait_event_interruptible(*req->wq, |
529 | req->status >= REQ_STATUS_RCVD); | |
1bab88b2 LI |
530 | P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d\n", |
531 | req->wq, tag, err); | |
91b8534f EVH |
532 | |
533 | if (req->status == REQ_STATUS_ERROR) { | |
51a87c55 | 534 | P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); |
91b8534f | 535 | err = req->t_err; |
91b8534f EVH |
536 | } |
537 | ||
1bab88b2 | 538 | if ((err == -ERESTARTSYS) && (c->status == Connected)) { |
51a87c55 | 539 | P9_DPRINTK(P9_DEBUG_MUX, "flushing\n"); |
91b8534f | 540 | sigpending = 1; |
91b8534f EVH |
541 | clear_thread_flag(TIF_SIGPENDING); |
542 | ||
1bab88b2 LI |
543 | if (c->trans_mod->cancel(c, req)) |
544 | p9_client_flush(c, req); | |
545 | ||
546 | /* if we received the response anyway, don't signal error */ | |
547 | if (req->status == REQ_STATUS_RCVD) | |
548 | err = 0; | |
91b8534f EVH |
549 | } |
550 | ||
551 | if (sigpending) { | |
552 | spin_lock_irqsave(¤t->sighand->siglock, flags); | |
553 | recalc_sigpending(); | |
554 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); | |
555 | } | |
556 | ||
557 | if (err < 0) | |
558 | goto reterr; | |
559 | ||
51a87c55 EVH |
560 | err = p9_check_errors(c, req); |
561 | if (!err) { | |
562 | P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type); | |
563 | return req; | |
91b8534f EVH |
564 | } |
565 | ||
91b8534f | 566 | reterr: |
51a87c55 EVH |
567 | P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type, |
568 | err); | |
91b8534f | 569 | p9_free_req(c, req); |
51a87c55 | 570 | return ERR_PTR(err); |
91b8534f EVH |
571 | } |
572 | ||
5503ac56 EVH |
573 | static struct p9_fid *p9_fid_create(struct p9_client *clnt) |
574 | { | |
9f3e9bbe | 575 | int ret; |
5503ac56 | 576 | struct p9_fid *fid; |
cac23d65 | 577 | unsigned long flags; |
5503ac56 | 578 | |
51a87c55 | 579 | P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt); |
5503ac56 EVH |
580 | fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); |
581 | if (!fid) | |
582 | return ERR_PTR(-ENOMEM); | |
583 | ||
9f3e9bbe | 584 | ret = p9_idpool_get(clnt->fidpool); |
24e94de4 | 585 | if (ret < 0) { |
9f3e9bbe | 586 | ret = -ENOSPC; |
5503ac56 EVH |
587 | goto error; |
588 | } | |
9f3e9bbe | 589 | fid->fid = ret; |
5503ac56 EVH |
590 | |
591 | memset(&fid->qid, 0, sizeof(struct p9_qid)); | |
592 | fid->mode = -1; | |
593 | fid->rdir_fpos = 0; | |
f8b9d53a | 594 | fid->uid = current_fsuid(); |
5503ac56 EVH |
595 | fid->clnt = clnt; |
596 | fid->aux = NULL; | |
597 | ||
cac23d65 | 598 | spin_lock_irqsave(&clnt->lock, flags); |
5503ac56 | 599 | list_add(&fid->flist, &clnt->fidlist); |
cac23d65 | 600 | spin_unlock_irqrestore(&clnt->lock, flags); |
5503ac56 EVH |
601 | |
602 | return fid; | |
603 | ||
604 | error: | |
605 | kfree(fid); | |
9f3e9bbe | 606 | return ERR_PTR(ret); |
5503ac56 EVH |
607 | } |
608 | ||
609 | static void p9_fid_destroy(struct p9_fid *fid) | |
610 | { | |
611 | struct p9_client *clnt; | |
cac23d65 | 612 | unsigned long flags; |
5503ac56 | 613 | |
51a87c55 | 614 | P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid); |
5503ac56 EVH |
615 | clnt = fid->clnt; |
616 | p9_idpool_put(fid->fid, clnt->fidpool); | |
cac23d65 | 617 | spin_lock_irqsave(&clnt->lock, flags); |
5503ac56 | 618 | list_del(&fid->flist); |
cac23d65 | 619 | spin_unlock_irqrestore(&clnt->lock, flags); |
5503ac56 EVH |
620 | kfree(fid); |
621 | } | |
8a0dc95f | 622 | |
51a87c55 | 623 | int p9_client_version(struct p9_client *c) |
bd238fb4 | 624 | { |
6936bf60 | 625 | int err = 0; |
51a87c55 EVH |
626 | struct p9_req_t *req; |
627 | char *version; | |
628 | int msize; | |
bd238fb4 | 629 | |
51a87c55 EVH |
630 | P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d extended %d\n", |
631 | c->msize, c->dotu); | |
632 | req = p9_client_rpc(c, P9_TVERSION, "ds", c->msize, | |
633 | c->dotu ? "9P2000.u" : "9P2000"); | |
634 | if (IS_ERR(req)) | |
635 | return PTR_ERR(req); | |
6936bf60 | 636 | |
51a87c55 EVH |
637 | err = p9pdu_readf(req->rc, c->dotu, "ds", &msize, &version); |
638 | if (err) { | |
639 | P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err); | |
e7f4b8f1 | 640 | p9pdu_dump(1, req->rc); |
6936bf60 | 641 | goto error; |
51a87c55 | 642 | } |
6936bf60 | 643 | |
51a87c55 EVH |
644 | P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); |
645 | if (!memcmp(version, "9P2000.u", 8)) | |
646 | c->dotu = 1; | |
647 | else if (!memcmp(version, "9P2000", 6)) | |
648 | c->dotu = 0; | |
6936bf60 EVH |
649 | else { |
650 | err = -EREMOTEIO; | |
651 | goto error; | |
652 | } | |
653 | ||
51a87c55 EVH |
654 | if (msize < c->msize) |
655 | c->msize = msize; | |
6936bf60 EVH |
656 | |
657 | error: | |
51a87c55 EVH |
658 | kfree(version); |
659 | p9_free_req(c, req); | |
6936bf60 EVH |
660 | |
661 | return err; | |
662 | } | |
51a87c55 | 663 | EXPORT_SYMBOL(p9_client_version); |
6936bf60 EVH |
664 | |
665 | struct p9_client *p9_client_create(const char *dev_name, char *options) | |
666 | { | |
667 | int err; | |
668 | struct p9_client *clnt; | |
669 | ||
670 | err = 0; | |
bd238fb4 LI |
671 | clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); |
672 | if (!clnt) | |
673 | return ERR_PTR(-ENOMEM); | |
674 | ||
72029fe8 | 675 | clnt->trans_mod = NULL; |
bb8ffdfc | 676 | clnt->trans = NULL; |
bd238fb4 | 677 | spin_lock_init(&clnt->lock); |
bd238fb4 LI |
678 | INIT_LIST_HEAD(&clnt->fidlist); |
679 | clnt->fidpool = p9_idpool_create(); | |
728fc4ef | 680 | if (IS_ERR(clnt->fidpool)) { |
bd238fb4 LI |
681 | err = PTR_ERR(clnt->fidpool); |
682 | clnt->fidpool = NULL; | |
683 | goto error; | |
684 | } | |
685 | ||
fea511a6 EVH |
686 | p9_tag_init(clnt); |
687 | ||
bb8ffdfc EVH |
688 | err = parse_opts(options, clnt); |
689 | if (err < 0) | |
690 | goto error; | |
691 | ||
8a0dc95f EVH |
692 | if (clnt->trans_mod == NULL) { |
693 | err = -EPROTONOSUPPORT; | |
694 | P9_DPRINTK(P9_DEBUG_ERROR, | |
695 | "No transport defined or default transport\n"); | |
696 | goto error; | |
697 | } | |
698 | ||
51a87c55 | 699 | P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d dotu %d\n", |
8a0dc95f EVH |
700 | clnt, clnt->trans_mod, clnt->msize, clnt->dotu); |
701 | ||
8b81ef58 EVH |
702 | err = clnt->trans_mod->create(clnt, dev_name, options); |
703 | if (err) | |
bd238fb4 | 704 | goto error; |
bd238fb4 | 705 | |
8a0dc95f EVH |
706 | if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize) |
707 | clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ; | |
708 | ||
6936bf60 | 709 | err = p9_client_version(clnt); |
bd238fb4 LI |
710 | if (err) |
711 | goto error; | |
712 | ||
bd238fb4 LI |
713 | return clnt; |
714 | ||
715 | error: | |
bd238fb4 LI |
716 | p9_client_destroy(clnt); |
717 | return ERR_PTR(err); | |
718 | } | |
719 | EXPORT_SYMBOL(p9_client_create); | |
720 | ||
721 | void p9_client_destroy(struct p9_client *clnt) | |
722 | { | |
723 | struct p9_fid *fid, *fidptr; | |
724 | ||
51a87c55 | 725 | P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt); |
bd238fb4 | 726 | |
8b81ef58 EVH |
727 | if (clnt->trans_mod) |
728 | clnt->trans_mod->close(clnt); | |
bd238fb4 | 729 | |
72029fe8 TH |
730 | v9fs_put_trans(clnt->trans_mod); |
731 | ||
bd238fb4 LI |
732 | list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) |
733 | p9_fid_destroy(fid); | |
734 | ||
0af8887e EVH |
735 | if (clnt->fidpool) |
736 | p9_idpool_destroy(clnt->fidpool); | |
737 | ||
fea511a6 EVH |
738 | p9_tag_cleanup(clnt); |
739 | ||
bd238fb4 LI |
740 | kfree(clnt); |
741 | } | |
742 | EXPORT_SYMBOL(p9_client_destroy); | |
743 | ||
744 | void p9_client_disconnect(struct p9_client *clnt) | |
745 | { | |
746 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); | |
8b81ef58 | 747 | clnt->status = Disconnected; |
bd238fb4 LI |
748 | } |
749 | EXPORT_SYMBOL(p9_client_disconnect); | |
750 | ||
751 | struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, | |
ba17674f | 752 | char *uname, u32 n_uname, char *aname) |
bd238fb4 LI |
753 | { |
754 | int err; | |
51a87c55 | 755 | struct p9_req_t *req; |
bd238fb4 | 756 | struct p9_fid *fid; |
51a87c55 | 757 | struct p9_qid qid; |
bd238fb4 | 758 | |
51a87c55 EVH |
759 | P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", |
760 | afid ? afid->fid : -1, uname, aname); | |
bd238fb4 | 761 | err = 0; |
bd238fb4 LI |
762 | |
763 | fid = p9_fid_create(clnt); | |
764 | if (IS_ERR(fid)) { | |
765 | err = PTR_ERR(fid); | |
766 | fid = NULL; | |
767 | goto error; | |
768 | } | |
769 | ||
51a87c55 EVH |
770 | req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid, |
771 | afid ? afid->fid : P9_NOFID, uname, aname, n_uname); | |
772 | if (IS_ERR(req)) { | |
773 | err = PTR_ERR(req); | |
bd238fb4 LI |
774 | goto error; |
775 | } | |
776 | ||
51a87c55 EVH |
777 | err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid); |
778 | if (err) { | |
e7f4b8f1 | 779 | p9pdu_dump(1, req->rc); |
51a87c55 | 780 | p9_free_req(clnt, req); |
bd238fb4 | 781 | goto error; |
51a87c55 | 782 | } |
bd238fb4 | 783 | |
51a87c55 | 784 | P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", |
b0d5fdef RD |
785 | qid.type, |
786 | (unsigned long long)qid.path, | |
787 | qid.version); | |
51a87c55 EVH |
788 | |
789 | memmove(&fid->qid, &qid, sizeof(struct p9_qid)); | |
790 | ||
791 | p9_free_req(clnt, req); | |
bd238fb4 LI |
792 | return fid; |
793 | ||
794 | error: | |
bd238fb4 LI |
795 | if (fid) |
796 | p9_fid_destroy(fid); | |
797 | return ERR_PTR(err); | |
798 | } | |
799 | EXPORT_SYMBOL(p9_client_attach); | |
800 | ||
51a87c55 EVH |
801 | struct p9_fid * |
802 | p9_client_auth(struct p9_client *clnt, char *uname, u32 n_uname, char *aname) | |
bd238fb4 LI |
803 | { |
804 | int err; | |
51a87c55 EVH |
805 | struct p9_req_t *req; |
806 | struct p9_qid qid; | |
807 | struct p9_fid *afid; | |
bd238fb4 | 808 | |
51a87c55 | 809 | P9_DPRINTK(P9_DEBUG_9P, ">>> TAUTH uname %s aname %s\n", uname, aname); |
bd238fb4 | 810 | err = 0; |
bd238fb4 | 811 | |
51a87c55 EVH |
812 | afid = p9_fid_create(clnt); |
813 | if (IS_ERR(afid)) { | |
814 | err = PTR_ERR(afid); | |
815 | afid = NULL; | |
bd238fb4 LI |
816 | goto error; |
817 | } | |
818 | ||
51a87c55 EVH |
819 | req = p9_client_rpc(clnt, P9_TAUTH, "dss?d", |
820 | afid ? afid->fid : P9_NOFID, uname, aname, n_uname); | |
821 | if (IS_ERR(req)) { | |
822 | err = PTR_ERR(req); | |
bd238fb4 LI |
823 | goto error; |
824 | } | |
825 | ||
51a87c55 EVH |
826 | err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid); |
827 | if (err) { | |
e7f4b8f1 | 828 | p9pdu_dump(1, req->rc); |
51a87c55 | 829 | p9_free_req(clnt, req); |
bd238fb4 | 830 | goto error; |
51a87c55 | 831 | } |
bd238fb4 | 832 | |
51a87c55 | 833 | P9_DPRINTK(P9_DEBUG_9P, "<<< RAUTH qid %x.%llx.%x\n", |
b0d5fdef RD |
834 | qid.type, |
835 | (unsigned long long)qid.path, | |
836 | qid.version); | |
51a87c55 EVH |
837 | |
838 | memmove(&afid->qid, &qid, sizeof(struct p9_qid)); | |
839 | p9_free_req(clnt, req); | |
840 | return afid; | |
bd238fb4 LI |
841 | |
842 | error: | |
51a87c55 EVH |
843 | if (afid) |
844 | p9_fid_destroy(afid); | |
bd238fb4 LI |
845 | return ERR_PTR(err); |
846 | } | |
847 | EXPORT_SYMBOL(p9_client_auth); | |
848 | ||
849 | struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames, | |
850 | int clone) | |
851 | { | |
852 | int err; | |
bd238fb4 LI |
853 | struct p9_client *clnt; |
854 | struct p9_fid *fid; | |
51a87c55 EVH |
855 | struct p9_qid *wqids; |
856 | struct p9_req_t *req; | |
857 | int16_t nwqids, count; | |
bd238fb4 | 858 | |
bd238fb4 | 859 | err = 0; |
bd238fb4 LI |
860 | clnt = oldfid->clnt; |
861 | if (clone) { | |
862 | fid = p9_fid_create(clnt); | |
863 | if (IS_ERR(fid)) { | |
864 | err = PTR_ERR(fid); | |
865 | fid = NULL; | |
866 | goto error; | |
867 | } | |
868 | ||
869 | fid->uid = oldfid->uid; | |
870 | } else | |
871 | fid = oldfid; | |
872 | ||
51a87c55 EVH |
873 | |
874 | P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n", | |
875 | oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); | |
876 | ||
877 | req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, | |
878 | nwname, wnames); | |
879 | if (IS_ERR(req)) { | |
880 | err = PTR_ERR(req); | |
bd238fb4 LI |
881 | goto error; |
882 | } | |
883 | ||
51a87c55 | 884 | err = p9pdu_readf(req->rc, clnt->dotu, "R", &nwqids, &wqids); |
e7f4b8f1 EVH |
885 | if (err) { |
886 | p9pdu_dump(1, req->rc); | |
887 | p9_free_req(clnt, req); | |
51a87c55 | 888 | goto clunk_fid; |
e7f4b8f1 EVH |
889 | } |
890 | p9_free_req(clnt, req); | |
bd238fb4 | 891 | |
51a87c55 EVH |
892 | P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); |
893 | ||
894 | if (nwqids != nwname) { | |
bd238fb4 LI |
895 | err = -ENOENT; |
896 | goto clunk_fid; | |
897 | } | |
898 | ||
51a87c55 EVH |
899 | for (count = 0; count < nwqids; count++) |
900 | P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", | |
b0d5fdef RD |
901 | count, wqids[count].type, |
902 | (unsigned long long)wqids[count].path, | |
51a87c55 EVH |
903 | wqids[count].version); |
904 | ||
bd238fb4 | 905 | if (nwname) |
51a87c55 | 906 | memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); |
bd238fb4 LI |
907 | else |
908 | fid->qid = oldfid->qid; | |
909 | ||
bd238fb4 LI |
910 | return fid; |
911 | ||
912 | clunk_fid: | |
51a87c55 EVH |
913 | p9_client_clunk(fid); |
914 | fid = NULL; | |
bd238fb4 LI |
915 | |
916 | error: | |
bd238fb4 LI |
917 | if (fid && (fid != oldfid)) |
918 | p9_fid_destroy(fid); | |
919 | ||
920 | return ERR_PTR(err); | |
921 | } | |
922 | EXPORT_SYMBOL(p9_client_walk); | |
923 | ||
924 | int p9_client_open(struct p9_fid *fid, int mode) | |
925 | { | |
926 | int err; | |
bd238fb4 | 927 | struct p9_client *clnt; |
51a87c55 EVH |
928 | struct p9_req_t *req; |
929 | struct p9_qid qid; | |
930 | int iounit; | |
bd238fb4 | 931 | |
51a87c55 | 932 | P9_DPRINTK(P9_DEBUG_9P, ">>> TOPEN fid %d mode %d\n", fid->fid, mode); |
bd238fb4 | 933 | err = 0; |
bd238fb4 LI |
934 | clnt = fid->clnt; |
935 | ||
936 | if (fid->mode != -1) | |
937 | return -EINVAL; | |
938 | ||
51a87c55 EVH |
939 | req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); |
940 | if (IS_ERR(req)) { | |
941 | err = PTR_ERR(req); | |
942 | goto error; | |
bd238fb4 LI |
943 | } |
944 | ||
51a87c55 | 945 | err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit); |
e7f4b8f1 EVH |
946 | if (err) { |
947 | p9pdu_dump(1, req->rc); | |
948 | goto free_and_error; | |
949 | } | |
51a87c55 EVH |
950 | |
951 | P9_DPRINTK(P9_DEBUG_9P, "<<< ROPEN qid %x.%llx.%x iounit %x\n", | |
b0d5fdef RD |
952 | qid.type, |
953 | (unsigned long long)qid.path, | |
954 | qid.version, iounit); | |
bd238fb4 LI |
955 | |
956 | fid->mode = mode; | |
51a87c55 | 957 | fid->iounit = iounit; |
bd238fb4 | 958 | |
e7f4b8f1 EVH |
959 | free_and_error: |
960 | p9_free_req(clnt, req); | |
51a87c55 | 961 | error: |
bd238fb4 LI |
962 | return err; |
963 | } | |
964 | EXPORT_SYMBOL(p9_client_open); | |
965 | ||
966 | int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode, | |
967 | char *extension) | |
968 | { | |
969 | int err; | |
bd238fb4 | 970 | struct p9_client *clnt; |
51a87c55 EVH |
971 | struct p9_req_t *req; |
972 | struct p9_qid qid; | |
973 | int iounit; | |
bd238fb4 | 974 | |
51a87c55 EVH |
975 | P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", |
976 | fid->fid, name, perm, mode); | |
bd238fb4 | 977 | err = 0; |
bd238fb4 LI |
978 | clnt = fid->clnt; |
979 | ||
980 | if (fid->mode != -1) | |
981 | return -EINVAL; | |
982 | ||
51a87c55 EVH |
983 | req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, |
984 | mode, extension); | |
985 | if (IS_ERR(req)) { | |
986 | err = PTR_ERR(req); | |
987 | goto error; | |
bd238fb4 LI |
988 | } |
989 | ||
51a87c55 | 990 | err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit); |
e7f4b8f1 EVH |
991 | if (err) { |
992 | p9pdu_dump(1, req->rc); | |
993 | goto free_and_error; | |
994 | } | |
51a87c55 EVH |
995 | |
996 | P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", | |
b0d5fdef RD |
997 | qid.type, |
998 | (unsigned long long)qid.path, | |
999 | qid.version, iounit); | |
bd238fb4 LI |
1000 | |
1001 | fid->mode = mode; | |
51a87c55 | 1002 | fid->iounit = iounit; |
bd238fb4 | 1003 | |
e7f4b8f1 EVH |
1004 | free_and_error: |
1005 | p9_free_req(clnt, req); | |
51a87c55 | 1006 | error: |
bd238fb4 LI |
1007 | return err; |
1008 | } | |
1009 | EXPORT_SYMBOL(p9_client_fcreate); | |
1010 | ||
1011 | int p9_client_clunk(struct p9_fid *fid) | |
1012 | { | |
1013 | int err; | |
bd238fb4 | 1014 | struct p9_client *clnt; |
51a87c55 | 1015 | struct p9_req_t *req; |
bd238fb4 | 1016 | |
51a87c55 | 1017 | P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid); |
bd238fb4 | 1018 | err = 0; |
bd238fb4 LI |
1019 | clnt = fid->clnt; |
1020 | ||
51a87c55 EVH |
1021 | req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); |
1022 | if (IS_ERR(req)) { | |
1023 | err = PTR_ERR(req); | |
1024 | goto error; | |
bd238fb4 LI |
1025 | } |
1026 | ||
51a87c55 | 1027 | P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); |
bd238fb4 | 1028 | |
51a87c55 | 1029 | p9_free_req(clnt, req); |
bd238fb4 LI |
1030 | p9_fid_destroy(fid); |
1031 | ||
51a87c55 | 1032 | error: |
bd238fb4 LI |
1033 | return err; |
1034 | } | |
1035 | EXPORT_SYMBOL(p9_client_clunk); | |
1036 | ||
1037 | int p9_client_remove(struct p9_fid *fid) | |
1038 | { | |
1039 | int err; | |
bd238fb4 | 1040 | struct p9_client *clnt; |
51a87c55 | 1041 | struct p9_req_t *req; |
bd238fb4 | 1042 | |
51a87c55 | 1043 | P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); |
bd238fb4 | 1044 | err = 0; |
bd238fb4 LI |
1045 | clnt = fid->clnt; |
1046 | ||
51a87c55 EVH |
1047 | req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); |
1048 | if (IS_ERR(req)) { | |
1049 | err = PTR_ERR(req); | |
1050 | goto error; | |
bd238fb4 LI |
1051 | } |
1052 | ||
51a87c55 | 1053 | P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); |
bd238fb4 | 1054 | |
51a87c55 | 1055 | p9_free_req(clnt, req); |
bd238fb4 LI |
1056 | p9_fid_destroy(fid); |
1057 | ||
51a87c55 | 1058 | error: |
bd238fb4 LI |
1059 | return err; |
1060 | } | |
1061 | EXPORT_SYMBOL(p9_client_remove); | |
1062 | ||
0fc9655e EVH |
1063 | int |
1064 | p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset, | |
1065 | u32 count) | |
bd238fb4 | 1066 | { |
51a87c55 | 1067 | int err, rsize, total; |
bd238fb4 | 1068 | struct p9_client *clnt; |
51a87c55 EVH |
1069 | struct p9_req_t *req; |
1070 | char *dataptr; | |
bd238fb4 | 1071 | |
51a87c55 | 1072 | P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid, |
bd238fb4 LI |
1073 | (long long unsigned) offset, count); |
1074 | err = 0; | |
bd238fb4 LI |
1075 | clnt = fid->clnt; |
1076 | total = 0; | |
1077 | ||
1078 | rsize = fid->iounit; | |
1079 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) | |
1080 | rsize = clnt->msize - P9_IOHDRSZ; | |
1081 | ||
51a87c55 EVH |
1082 | if (count < rsize) |
1083 | rsize = count; | |
bd238fb4 | 1084 | |
51a87c55 EVH |
1085 | req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, rsize); |
1086 | if (IS_ERR(req)) { | |
1087 | err = PTR_ERR(req); | |
1088 | goto error; | |
1089 | } | |
bd238fb4 | 1090 | |
51a87c55 | 1091 | err = p9pdu_readf(req->rc, clnt->dotu, "D", &count, &dataptr); |
e7f4b8f1 EVH |
1092 | if (err) { |
1093 | p9pdu_dump(1, req->rc); | |
51a87c55 | 1094 | goto free_and_error; |
e7f4b8f1 | 1095 | } |
bd238fb4 | 1096 | |
51a87c55 | 1097 | P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count); |
bd238fb4 | 1098 | |
51a87c55 EVH |
1099 | if (data) { |
1100 | memmove(data, dataptr, count); | |
1101 | data += count; | |
1102 | } | |
bd238fb4 | 1103 | |
51a87c55 EVH |
1104 | if (udata) { |
1105 | err = copy_to_user(udata, dataptr, count); | |
1106 | if (err) { | |
1107 | err = -EFAULT; | |
1108 | goto free_and_error; | |
bd238fb4 | 1109 | } |
51a87c55 | 1110 | } |
bd238fb4 | 1111 | |
51a87c55 EVH |
1112 | p9_free_req(clnt, req); |
1113 | return count; | |
bd238fb4 | 1114 | |
51a87c55 EVH |
1115 | free_and_error: |
1116 | p9_free_req(clnt, req); | |
bd238fb4 | 1117 | error: |
bd238fb4 LI |
1118 | return err; |
1119 | } | |
0fc9655e | 1120 | EXPORT_SYMBOL(p9_client_read); |
bd238fb4 LI |
1121 | |
1122 | int | |
0fc9655e EVH |
1123 | p9_client_write(struct p9_fid *fid, char *data, const char __user *udata, |
1124 | u64 offset, u32 count) | |
bd238fb4 | 1125 | { |
51a87c55 | 1126 | int err, rsize, total; |
bd238fb4 | 1127 | struct p9_client *clnt; |
51a87c55 | 1128 | struct p9_req_t *req; |
bd238fb4 | 1129 | |
51a87c55 EVH |
1130 | P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n", |
1131 | fid->fid, (long long unsigned) offset, count); | |
bd238fb4 | 1132 | err = 0; |
bd238fb4 LI |
1133 | clnt = fid->clnt; |
1134 | total = 0; | |
1135 | ||
1136 | rsize = fid->iounit; | |
1137 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) | |
1138 | rsize = clnt->msize - P9_IOHDRSZ; | |
1139 | ||
51a87c55 EVH |
1140 | if (count < rsize) |
1141 | rsize = count; | |
1142 | if (data) | |
1143 | req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, offset, | |
1144 | rsize, data); | |
1145 | else | |
1146 | req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, offset, | |
1147 | rsize, udata); | |
1148 | if (IS_ERR(req)) { | |
1149 | err = PTR_ERR(req); | |
1150 | goto error; | |
1151 | } | |
0fc9655e | 1152 | |
51a87c55 | 1153 | err = p9pdu_readf(req->rc, clnt->dotu, "d", &count); |
e7f4b8f1 EVH |
1154 | if (err) { |
1155 | p9pdu_dump(1, req->rc); | |
51a87c55 | 1156 | goto free_and_error; |
e7f4b8f1 EVH |
1157 | } |
1158 | ||
51a87c55 | 1159 | P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); |
bd238fb4 | 1160 | |
51a87c55 EVH |
1161 | p9_free_req(clnt, req); |
1162 | return count; | |
bd238fb4 | 1163 | |
51a87c55 EVH |
1164 | free_and_error: |
1165 | p9_free_req(clnt, req); | |
bd238fb4 | 1166 | error: |
bd238fb4 LI |
1167 | return err; |
1168 | } | |
0fc9655e | 1169 | EXPORT_SYMBOL(p9_client_write); |
bd238fb4 | 1170 | |
51a87c55 | 1171 | struct p9_wstat *p9_client_stat(struct p9_fid *fid) |
5503ac56 | 1172 | { |
51a87c55 EVH |
1173 | int err; |
1174 | struct p9_client *clnt; | |
1175 | struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); | |
1176 | struct p9_req_t *req; | |
1177 | u16 ignored; | |
5503ac56 | 1178 | |
51a87c55 | 1179 | P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); |
5503ac56 | 1180 | |
5503ac56 EVH |
1181 | if (!ret) |
1182 | return ERR_PTR(-ENOMEM); | |
1183 | ||
bd238fb4 | 1184 | err = 0; |
bd238fb4 LI |
1185 | clnt = fid->clnt; |
1186 | ||
51a87c55 EVH |
1187 | req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); |
1188 | if (IS_ERR(req)) { | |
1189 | err = PTR_ERR(req); | |
bd238fb4 LI |
1190 | goto error; |
1191 | } | |
1192 | ||
51a87c55 | 1193 | err = p9pdu_readf(req->rc, clnt->dotu, "wS", &ignored, ret); |
e7f4b8f1 EVH |
1194 | if (err) { |
1195 | ret = ERR_PTR(err); | |
1196 | p9pdu_dump(1, req->rc); | |
1197 | goto free_and_error; | |
1198 | } | |
bd238fb4 | 1199 | |
51a87c55 | 1200 | P9_DPRINTK(P9_DEBUG_9P, |
e7f4b8f1 EVH |
1201 | "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" |
1202 | "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" | |
1203 | "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" | |
1204 | "<<< uid=%d gid=%d n_muid=%d\n", | |
51a87c55 | 1205 | ret->size, ret->type, ret->dev, ret->qid.type, |
b0d5fdef RD |
1206 | (unsigned long long)ret->qid.path, ret->qid.version, ret->mode, |
1207 | ret->atime, ret->mtime, (unsigned long long)ret->length, | |
1208 | ret->name, ret->uid, ret->gid, ret->muid, ret->extension, | |
e7f4b8f1 | 1209 | ret->n_uid, ret->n_gid, ret->n_muid); |
bd238fb4 | 1210 | |
742b11a7 LI |
1211 | p9_free_req(clnt, req); |
1212 | return ret; | |
1213 | ||
e7f4b8f1 EVH |
1214 | free_and_error: |
1215 | p9_free_req(clnt, req); | |
bd238fb4 | 1216 | error: |
742b11a7 LI |
1217 | kfree(ret); |
1218 | return ERR_PTR(err); | |
bd238fb4 LI |
1219 | } |
1220 | EXPORT_SYMBOL(p9_client_stat); | |
1221 | ||
453ed90d LI |
1222 | static int p9_client_statsize(struct p9_wstat *wst, int optional) |
1223 | { | |
1224 | int ret; | |
1225 | ||
1226 | /* size[2] type[2] dev[4] qid[13] */ | |
1227 | /* mode[4] atime[4] mtime[4] length[8]*/ | |
1228 | /* name[s] uid[s] gid[s] muid[s] */ | |
1229 | ret = 2+2+4+13+4+4+4+8+2+2+2+2; | |
1230 | ||
1231 | if (wst->name) | |
1232 | ret += strlen(wst->name); | |
1233 | if (wst->uid) | |
1234 | ret += strlen(wst->uid); | |
1235 | if (wst->gid) | |
1236 | ret += strlen(wst->gid); | |
1237 | if (wst->muid) | |
1238 | ret += strlen(wst->muid); | |
1239 | ||
1240 | if (optional) { | |
1241 | ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ | |
1242 | if (wst->extension) | |
1243 | ret += strlen(wst->extension); | |
1244 | } | |
1245 | ||
1246 | return ret; | |
1247 | } | |
1248 | ||
bd238fb4 LI |
1249 | int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) |
1250 | { | |
1251 | int err; | |
51a87c55 | 1252 | struct p9_req_t *req; |
bd238fb4 LI |
1253 | struct p9_client *clnt; |
1254 | ||
453ed90d LI |
1255 | err = 0; |
1256 | clnt = fid->clnt; | |
1257 | wst->size = p9_client_statsize(wst, clnt->dotu); | |
51a87c55 | 1258 | P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); |
e7f4b8f1 EVH |
1259 | P9_DPRINTK(P9_DEBUG_9P, |
1260 | " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" | |
1261 | " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" | |
1262 | " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" | |
1263 | " uid=%d gid=%d n_muid=%d\n", | |
1264 | wst->size, wst->type, wst->dev, wst->qid.type, | |
b0d5fdef RD |
1265 | (unsigned long long)wst->qid.path, wst->qid.version, wst->mode, |
1266 | wst->atime, wst->mtime, (unsigned long long)wst->length, | |
1267 | wst->name, wst->uid, wst->gid, wst->muid, wst->extension, | |
e7f4b8f1 | 1268 | wst->n_uid, wst->n_gid, wst->n_muid); |
bd238fb4 | 1269 | |
453ed90d | 1270 | req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size, wst); |
51a87c55 EVH |
1271 | if (IS_ERR(req)) { |
1272 | err = PTR_ERR(req); | |
1273 | goto error; | |
bd238fb4 LI |
1274 | } |
1275 | ||
51a87c55 | 1276 | P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); |
bd238fb4 | 1277 | |
51a87c55 EVH |
1278 | p9_free_req(clnt, req); |
1279 | error: | |
bd238fb4 LI |
1280 | return err; |
1281 | } | |
1282 | EXPORT_SYMBOL(p9_client_wstat); |