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