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 | /* if this was a flush request we have to free response fcall */ | |
51a87c55 | 316 | if (r->rc->id == P9_RFLUSH) { |
673d62cd EVH |
317 | kfree(r->tc); |
318 | kfree(r->rc); | |
319 | } | |
320 | } | |
321 | ||
91b8534f EVH |
322 | /** |
323 | * p9_client_cb - call back from transport to client | |
324 | * c: client state | |
325 | * req: request received | |
326 | * | |
327 | */ | |
328 | void p9_client_cb(struct p9_client *c, struct p9_req_t *req) | |
329 | { | |
330 | struct p9_req_t *other_req; | |
331 | unsigned long flags; | |
332 | ||
51a87c55 | 333 | P9_DPRINTK(P9_DEBUG_MUX, " tag %d\n", req->tc->tag); |
91b8534f EVH |
334 | |
335 | if (req->status == REQ_STATUS_ERROR) | |
336 | wake_up(req->wq); | |
337 | ||
51a87c55 EVH |
338 | if (req->flush_tag) { /* flush receive path */ |
339 | P9_DPRINTK(P9_DEBUG_9P, "<<< RFLUSH %d\n", req->tc->tag); | |
91b8534f | 340 | spin_lock_irqsave(&c->lock, flags); |
51a87c55 EVH |
341 | other_req = p9_tag_lookup(c, req->flush_tag); |
342 | if (other_req->status != REQ_STATUS_FLSH) /* stale flush */ | |
91b8534f EVH |
343 | spin_unlock_irqrestore(&c->lock, flags); |
344 | else { | |
91b8534f EVH |
345 | other_req->status = REQ_STATUS_FLSHD; |
346 | spin_unlock_irqrestore(&c->lock, flags); | |
347 | wake_up(other_req->wq); | |
348 | } | |
349 | p9_free_req(c, req); | |
350 | } else { /* normal receive path */ | |
51a87c55 | 351 | P9_DPRINTK(P9_DEBUG_MUX, "normal: tag %d\n", req->tc->tag); |
91b8534f EVH |
352 | spin_lock_irqsave(&c->lock, flags); |
353 | if (req->status != REQ_STATUS_FLSHD) | |
354 | req->status = REQ_STATUS_RCVD; | |
91b8534f EVH |
355 | spin_unlock_irqrestore(&c->lock, flags); |
356 | wake_up(req->wq); | |
357 | P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag); | |
358 | } | |
359 | } | |
360 | EXPORT_SYMBOL(p9_client_cb); | |
361 | ||
51a87c55 EVH |
362 | /** |
363 | * p9_parse_header - parse header arguments out of a packet | |
364 | * @pdu: packet to parse | |
365 | * @size: size of packet | |
366 | * @type: type of request | |
367 | * @tag: tag of packet | |
368 | * @rewind: set if we need to rewind offset afterwards | |
369 | */ | |
370 | ||
371 | int | |
372 | p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag, | |
373 | int rewind) | |
374 | { | |
375 | int8_t r_type; | |
376 | int16_t r_tag; | |
377 | int32_t r_size; | |
378 | int offset = pdu->offset; | |
379 | int err; | |
380 | ||
381 | pdu->offset = 0; | |
382 | if (pdu->size == 0) | |
383 | pdu->size = 7; | |
384 | ||
385 | err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); | |
386 | if (err) | |
387 | goto rewind_and_exit; | |
388 | ||
389 | pdu->size = r_size; | |
390 | pdu->id = r_type; | |
391 | pdu->tag = r_tag; | |
392 | ||
e7f4b8f1 EVH |
393 | P9_DPRINTK(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", pdu->size, |
394 | pdu->id, pdu->tag); | |
51a87c55 EVH |
395 | |
396 | if (type) | |
397 | *type = r_type; | |
398 | if (tag) | |
399 | *tag = r_tag; | |
400 | if (size) | |
401 | *size = r_size; | |
402 | ||
403 | ||
404 | rewind_and_exit: | |
405 | if (rewind) | |
406 | pdu->offset = offset; | |
407 | return err; | |
408 | } | |
409 | EXPORT_SYMBOL(p9_parse_header); | |
410 | ||
411 | /** | |
412 | * p9_check_errors - check 9p packet for error return and process it | |
413 | * @c: current client instance | |
414 | * @req: request to parse and check for error conditions | |
415 | * | |
416 | * returns error code if one is discovered, otherwise returns 0 | |
417 | * | |
418 | * this will have to be more complicated if we have multiple | |
419 | * error packet types | |
420 | */ | |
421 | ||
422 | static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) | |
423 | { | |
424 | int8_t type; | |
425 | int err; | |
426 | ||
427 | err = p9_parse_header(req->rc, NULL, &type, NULL, 0); | |
428 | if (err) { | |
429 | P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); | |
430 | return err; | |
431 | } | |
432 | ||
433 | if (type == P9_RERROR) { | |
434 | int ecode; | |
435 | char *ename; | |
436 | ||
437 | err = p9pdu_readf(req->rc, c->dotu, "s?d", &ename, &ecode); | |
438 | if (err) { | |
439 | P9_DPRINTK(P9_DEBUG_ERROR, "couldn't parse error%d\n", | |
440 | err); | |
441 | return err; | |
442 | } | |
443 | ||
444 | if (c->dotu) | |
445 | err = -ecode; | |
446 | ||
447 | if (!err) { | |
448 | err = p9_errstr2errno(ename, strlen(ename)); | |
449 | ||
450 | /* string match failed */ | |
451 | if (!err) | |
452 | err = -ESERVERFAULT; | |
453 | } | |
454 | ||
455 | P9_DPRINTK(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", -ecode, ename); | |
456 | ||
457 | kfree(ename); | |
458 | } else | |
459 | err = 0; | |
460 | ||
461 | return err; | |
462 | } | |
463 | ||
464 | /** | |
465 | * p9_client_flush - flush (cancel) a request | |
466 | * c: client state | |
467 | * req: request to cancel | |
468 | * | |
469 | * This sents a flush for a particular requests and links | |
470 | * the flush request to the original request. The current | |
471 | * code only supports a single flush request although the protocol | |
472 | * allows for multiple flush requests to be sent for a single request. | |
473 | * | |
474 | */ | |
475 | ||
476 | static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) | |
477 | { | |
478 | struct p9_req_t *req; | |
479 | int16_t oldtag; | |
480 | int err; | |
481 | ||
482 | err = p9_parse_header(oldreq->tc, NULL, NULL, &oldtag, 1); | |
483 | if (err) | |
484 | return err; | |
485 | ||
486 | P9_DPRINTK(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); | |
487 | ||
488 | req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); | |
489 | if (IS_ERR(req)) | |
490 | return PTR_ERR(req); | |
491 | ||
492 | req->flush_tag = oldtag; | |
493 | ||
494 | /* we don't free anything here because RPC isn't complete */ | |
495 | return 0; | |
496 | } | |
497 | ||
91b8534f EVH |
498 | /** |
499 | * p9_client_rpc - issue a request and wait for a response | |
500 | * @c: client session | |
51a87c55 EVH |
501 | * @type: type of request |
502 | * @fmt: protocol format string (see protocol.c) | |
91b8534f | 503 | * |
51a87c55 | 504 | * Returns request structure (which client must free using p9_free_req) |
91b8534f EVH |
505 | */ |
506 | ||
51a87c55 EVH |
507 | static struct p9_req_t * |
508 | p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) | |
91b8534f | 509 | { |
51a87c55 EVH |
510 | va_list ap; |
511 | int tag, err; | |
91b8534f EVH |
512 | struct p9_req_t *req; |
513 | unsigned long flags; | |
514 | int sigpending; | |
515 | int flushed = 0; | |
516 | ||
51a87c55 | 517 | P9_DPRINTK(P9_DEBUG_MUX, "client %p op %d\n", c, type); |
91b8534f EVH |
518 | |
519 | if (c->status != Connected) | |
51a87c55 | 520 | return ERR_PTR(-EIO); |
91b8534f EVH |
521 | |
522 | if (signal_pending(current)) { | |
523 | sigpending = 1; | |
524 | clear_thread_flag(TIF_SIGPENDING); | |
525 | } else | |
526 | sigpending = 0; | |
527 | ||
528 | tag = P9_NOTAG; | |
51a87c55 | 529 | if (type != P9_TVERSION) { |
91b8534f EVH |
530 | tag = p9_idpool_get(c->tagpool); |
531 | if (tag < 0) | |
51a87c55 | 532 | return ERR_PTR(-ENOMEM); |
91b8534f EVH |
533 | } |
534 | ||
535 | req = p9_tag_alloc(c, tag); | |
51a87c55 EVH |
536 | if (IS_ERR(req)) |
537 | return req; | |
91b8534f | 538 | |
51a87c55 EVH |
539 | /* marshall the data */ |
540 | p9pdu_prepare(req->tc, tag, type); | |
541 | va_start(ap, fmt); | |
542 | err = p9pdu_vwritef(req->tc, c->dotu, fmt, ap); | |
543 | va_end(ap); | |
544 | p9pdu_finalize(req->tc); | |
91b8534f EVH |
545 | |
546 | err = c->trans_mod->request(c, req); | |
547 | if (err < 0) { | |
548 | c->status = Disconnected; | |
549 | goto reterr; | |
550 | } | |
551 | ||
552 | /* if it was a flush we just transmitted, return our tag */ | |
51a87c55 EVH |
553 | if (type == P9_TFLUSH) |
554 | return req; | |
91b8534f | 555 | again: |
51a87c55 | 556 | P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d\n", req->wq, tag); |
91b8534f EVH |
557 | err = wait_event_interruptible(*req->wq, |
558 | req->status >= REQ_STATUS_RCVD); | |
51a87c55 | 559 | P9_DPRINTK(P9_DEBUG_MUX, "wait %p tag: %d returned %d (flushed=%d)\n", |
91b8534f EVH |
560 | req->wq, tag, err, flushed); |
561 | ||
562 | if (req->status == REQ_STATUS_ERROR) { | |
51a87c55 | 563 | P9_DPRINTK(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); |
91b8534f EVH |
564 | err = req->t_err; |
565 | } else if (err == -ERESTARTSYS && flushed) { | |
51a87c55 | 566 | P9_DPRINTK(P9_DEBUG_MUX, "flushed - going again\n"); |
91b8534f EVH |
567 | goto again; |
568 | } else if (req->status == REQ_STATUS_FLSHD) { | |
51a87c55 | 569 | P9_DPRINTK(P9_DEBUG_MUX, "flushed - erestartsys\n"); |
91b8534f EVH |
570 | err = -ERESTARTSYS; |
571 | } | |
572 | ||
573 | if ((err == -ERESTARTSYS) && (c->status == Connected) && (!flushed)) { | |
51a87c55 | 574 | P9_DPRINTK(P9_DEBUG_MUX, "flushing\n"); |
91b8534f EVH |
575 | spin_lock_irqsave(&c->lock, flags); |
576 | if (req->status == REQ_STATUS_SENT) | |
577 | req->status = REQ_STATUS_FLSH; | |
578 | spin_unlock_irqrestore(&c->lock, flags); | |
579 | sigpending = 1; | |
580 | flushed = 1; | |
581 | clear_thread_flag(TIF_SIGPENDING); | |
582 | ||
583 | if (c->trans_mod->cancel(c, req)) { | |
584 | err = p9_client_flush(c, req); | |
585 | if (err == 0) | |
586 | goto again; | |
587 | } | |
588 | } | |
589 | ||
590 | if (sigpending) { | |
591 | spin_lock_irqsave(¤t->sighand->siglock, flags); | |
592 | recalc_sigpending(); | |
593 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); | |
594 | } | |
595 | ||
596 | if (err < 0) | |
597 | goto reterr; | |
598 | ||
51a87c55 EVH |
599 | err = p9_check_errors(c, req); |
600 | if (!err) { | |
601 | P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d\n", c, type); | |
602 | return req; | |
91b8534f EVH |
603 | } |
604 | ||
91b8534f | 605 | reterr: |
51a87c55 EVH |
606 | P9_DPRINTK(P9_DEBUG_MUX, "exit: client %p op %d error: %d\n", c, type, |
607 | err); | |
91b8534f | 608 | p9_free_req(c, req); |
51a87c55 | 609 | return ERR_PTR(err); |
91b8534f EVH |
610 | } |
611 | ||
5503ac56 EVH |
612 | static struct p9_fid *p9_fid_create(struct p9_client *clnt) |
613 | { | |
614 | int err; | |
615 | struct p9_fid *fid; | |
616 | ||
51a87c55 | 617 | P9_DPRINTK(P9_DEBUG_FID, "clnt %p\n", clnt); |
5503ac56 EVH |
618 | fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); |
619 | if (!fid) | |
620 | return ERR_PTR(-ENOMEM); | |
621 | ||
622 | fid->fid = p9_idpool_get(clnt->fidpool); | |
623 | if (fid->fid < 0) { | |
624 | err = -ENOSPC; | |
625 | goto error; | |
626 | } | |
627 | ||
628 | memset(&fid->qid, 0, sizeof(struct p9_qid)); | |
629 | fid->mode = -1; | |
630 | fid->rdir_fpos = 0; | |
5503ac56 EVH |
631 | fid->uid = current->fsuid; |
632 | fid->clnt = clnt; | |
633 | fid->aux = NULL; | |
634 | ||
635 | spin_lock(&clnt->lock); | |
636 | list_add(&fid->flist, &clnt->fidlist); | |
637 | spin_unlock(&clnt->lock); | |
638 | ||
639 | return fid; | |
640 | ||
641 | error: | |
642 | kfree(fid); | |
643 | return ERR_PTR(err); | |
644 | } | |
645 | ||
646 | static void p9_fid_destroy(struct p9_fid *fid) | |
647 | { | |
648 | struct p9_client *clnt; | |
649 | ||
51a87c55 | 650 | P9_DPRINTK(P9_DEBUG_FID, "fid %d\n", fid->fid); |
5503ac56 EVH |
651 | clnt = fid->clnt; |
652 | p9_idpool_put(fid->fid, clnt->fidpool); | |
653 | spin_lock(&clnt->lock); | |
654 | list_del(&fid->flist); | |
655 | spin_unlock(&clnt->lock); | |
5503ac56 EVH |
656 | kfree(fid); |
657 | } | |
8a0dc95f | 658 | |
51a87c55 | 659 | int p9_client_version(struct p9_client *c) |
bd238fb4 | 660 | { |
6936bf60 | 661 | int err = 0; |
51a87c55 EVH |
662 | struct p9_req_t *req; |
663 | char *version; | |
664 | int msize; | |
bd238fb4 | 665 | |
51a87c55 EVH |
666 | P9_DPRINTK(P9_DEBUG_9P, ">>> TVERSION msize %d extended %d\n", |
667 | c->msize, c->dotu); | |
668 | req = p9_client_rpc(c, P9_TVERSION, "ds", c->msize, | |
669 | c->dotu ? "9P2000.u" : "9P2000"); | |
670 | if (IS_ERR(req)) | |
671 | return PTR_ERR(req); | |
6936bf60 | 672 | |
51a87c55 EVH |
673 | err = p9pdu_readf(req->rc, c->dotu, "ds", &msize, &version); |
674 | if (err) { | |
675 | P9_DPRINTK(P9_DEBUG_9P, "version error %d\n", err); | |
e7f4b8f1 | 676 | p9pdu_dump(1, req->rc); |
6936bf60 | 677 | goto error; |
51a87c55 | 678 | } |
6936bf60 | 679 | |
51a87c55 EVH |
680 | P9_DPRINTK(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); |
681 | if (!memcmp(version, "9P2000.u", 8)) | |
682 | c->dotu = 1; | |
683 | else if (!memcmp(version, "9P2000", 6)) | |
684 | c->dotu = 0; | |
6936bf60 EVH |
685 | else { |
686 | err = -EREMOTEIO; | |
687 | goto error; | |
688 | } | |
689 | ||
51a87c55 EVH |
690 | if (msize < c->msize) |
691 | c->msize = msize; | |
6936bf60 EVH |
692 | |
693 | error: | |
51a87c55 EVH |
694 | kfree(version); |
695 | p9_free_req(c, req); | |
6936bf60 EVH |
696 | |
697 | return err; | |
698 | } | |
51a87c55 | 699 | EXPORT_SYMBOL(p9_client_version); |
6936bf60 EVH |
700 | |
701 | struct p9_client *p9_client_create(const char *dev_name, char *options) | |
702 | { | |
703 | int err; | |
704 | struct p9_client *clnt; | |
705 | ||
706 | err = 0; | |
bd238fb4 LI |
707 | clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); |
708 | if (!clnt) | |
709 | return ERR_PTR(-ENOMEM); | |
710 | ||
72029fe8 | 711 | clnt->trans_mod = NULL; |
bb8ffdfc | 712 | clnt->trans = NULL; |
bd238fb4 | 713 | spin_lock_init(&clnt->lock); |
bd238fb4 LI |
714 | INIT_LIST_HEAD(&clnt->fidlist); |
715 | clnt->fidpool = p9_idpool_create(); | |
728fc4ef | 716 | if (IS_ERR(clnt->fidpool)) { |
bd238fb4 LI |
717 | err = PTR_ERR(clnt->fidpool); |
718 | clnt->fidpool = NULL; | |
719 | goto error; | |
720 | } | |
721 | ||
fea511a6 EVH |
722 | p9_tag_init(clnt); |
723 | ||
bb8ffdfc EVH |
724 | err = parse_opts(options, clnt); |
725 | if (err < 0) | |
726 | goto error; | |
727 | ||
8a0dc95f EVH |
728 | if (clnt->trans_mod == NULL) { |
729 | err = -EPROTONOSUPPORT; | |
730 | P9_DPRINTK(P9_DEBUG_ERROR, | |
731 | "No transport defined or default transport\n"); | |
732 | goto error; | |
733 | } | |
734 | ||
51a87c55 | 735 | P9_DPRINTK(P9_DEBUG_MUX, "clnt %p trans %p msize %d dotu %d\n", |
8a0dc95f EVH |
736 | clnt, clnt->trans_mod, clnt->msize, clnt->dotu); |
737 | ||
8b81ef58 EVH |
738 | err = clnt->trans_mod->create(clnt, dev_name, options); |
739 | if (err) | |
bd238fb4 | 740 | goto error; |
bd238fb4 | 741 | |
8a0dc95f EVH |
742 | if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize) |
743 | clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ; | |
744 | ||
6936bf60 | 745 | err = p9_client_version(clnt); |
bd238fb4 LI |
746 | if (err) |
747 | goto error; | |
748 | ||
bd238fb4 LI |
749 | return clnt; |
750 | ||
751 | error: | |
bd238fb4 LI |
752 | p9_client_destroy(clnt); |
753 | return ERR_PTR(err); | |
754 | } | |
755 | EXPORT_SYMBOL(p9_client_create); | |
756 | ||
757 | void p9_client_destroy(struct p9_client *clnt) | |
758 | { | |
759 | struct p9_fid *fid, *fidptr; | |
760 | ||
51a87c55 | 761 | P9_DPRINTK(P9_DEBUG_MUX, "clnt %p\n", clnt); |
bd238fb4 | 762 | |
8b81ef58 EVH |
763 | if (clnt->trans_mod) |
764 | clnt->trans_mod->close(clnt); | |
bd238fb4 | 765 | |
72029fe8 TH |
766 | v9fs_put_trans(clnt->trans_mod); |
767 | ||
bd238fb4 LI |
768 | list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) |
769 | p9_fid_destroy(fid); | |
770 | ||
0af8887e EVH |
771 | if (clnt->fidpool) |
772 | p9_idpool_destroy(clnt->fidpool); | |
773 | ||
fea511a6 EVH |
774 | p9_tag_cleanup(clnt); |
775 | ||
bd238fb4 LI |
776 | kfree(clnt); |
777 | } | |
778 | EXPORT_SYMBOL(p9_client_destroy); | |
779 | ||
780 | void p9_client_disconnect(struct p9_client *clnt) | |
781 | { | |
782 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); | |
8b81ef58 | 783 | clnt->status = Disconnected; |
bd238fb4 LI |
784 | } |
785 | EXPORT_SYMBOL(p9_client_disconnect); | |
786 | ||
787 | struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, | |
ba17674f | 788 | char *uname, u32 n_uname, char *aname) |
bd238fb4 LI |
789 | { |
790 | int err; | |
51a87c55 | 791 | struct p9_req_t *req; |
bd238fb4 | 792 | struct p9_fid *fid; |
51a87c55 | 793 | struct p9_qid qid; |
bd238fb4 | 794 | |
51a87c55 EVH |
795 | P9_DPRINTK(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", |
796 | afid ? afid->fid : -1, uname, aname); | |
bd238fb4 | 797 | err = 0; |
bd238fb4 LI |
798 | |
799 | fid = p9_fid_create(clnt); | |
800 | if (IS_ERR(fid)) { | |
801 | err = PTR_ERR(fid); | |
802 | fid = NULL; | |
803 | goto error; | |
804 | } | |
805 | ||
51a87c55 EVH |
806 | req = p9_client_rpc(clnt, P9_TATTACH, "ddss?d", fid->fid, |
807 | afid ? afid->fid : P9_NOFID, uname, aname, n_uname); | |
808 | if (IS_ERR(req)) { | |
809 | err = PTR_ERR(req); | |
bd238fb4 LI |
810 | goto error; |
811 | } | |
812 | ||
51a87c55 EVH |
813 | err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid); |
814 | if (err) { | |
e7f4b8f1 | 815 | p9pdu_dump(1, req->rc); |
51a87c55 | 816 | p9_free_req(clnt, req); |
bd238fb4 | 817 | goto error; |
51a87c55 | 818 | } |
bd238fb4 | 819 | |
51a87c55 EVH |
820 | P9_DPRINTK(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", |
821 | qid.type, qid.path, qid.version); | |
822 | ||
823 | memmove(&fid->qid, &qid, sizeof(struct p9_qid)); | |
824 | ||
825 | p9_free_req(clnt, req); | |
bd238fb4 LI |
826 | return fid; |
827 | ||
828 | error: | |
bd238fb4 LI |
829 | if (fid) |
830 | p9_fid_destroy(fid); | |
831 | return ERR_PTR(err); | |
832 | } | |
833 | EXPORT_SYMBOL(p9_client_attach); | |
834 | ||
51a87c55 EVH |
835 | struct p9_fid * |
836 | p9_client_auth(struct p9_client *clnt, char *uname, u32 n_uname, char *aname) | |
bd238fb4 LI |
837 | { |
838 | int err; | |
51a87c55 EVH |
839 | struct p9_req_t *req; |
840 | struct p9_qid qid; | |
841 | struct p9_fid *afid; | |
bd238fb4 | 842 | |
51a87c55 | 843 | P9_DPRINTK(P9_DEBUG_9P, ">>> TAUTH uname %s aname %s\n", uname, aname); |
bd238fb4 | 844 | err = 0; |
bd238fb4 | 845 | |
51a87c55 EVH |
846 | afid = p9_fid_create(clnt); |
847 | if (IS_ERR(afid)) { | |
848 | err = PTR_ERR(afid); | |
849 | afid = NULL; | |
bd238fb4 LI |
850 | goto error; |
851 | } | |
852 | ||
51a87c55 EVH |
853 | req = p9_client_rpc(clnt, P9_TAUTH, "dss?d", |
854 | afid ? afid->fid : P9_NOFID, uname, aname, n_uname); | |
855 | if (IS_ERR(req)) { | |
856 | err = PTR_ERR(req); | |
bd238fb4 LI |
857 | goto error; |
858 | } | |
859 | ||
51a87c55 EVH |
860 | err = p9pdu_readf(req->rc, clnt->dotu, "Q", &qid); |
861 | if (err) { | |
e7f4b8f1 | 862 | p9pdu_dump(1, req->rc); |
51a87c55 | 863 | p9_free_req(clnt, req); |
bd238fb4 | 864 | goto error; |
51a87c55 | 865 | } |
bd238fb4 | 866 | |
51a87c55 EVH |
867 | P9_DPRINTK(P9_DEBUG_9P, "<<< RAUTH qid %x.%llx.%x\n", |
868 | qid.type, qid.path, qid.version); | |
869 | ||
870 | memmove(&afid->qid, &qid, sizeof(struct p9_qid)); | |
871 | p9_free_req(clnt, req); | |
872 | return afid; | |
bd238fb4 LI |
873 | |
874 | error: | |
51a87c55 EVH |
875 | if (afid) |
876 | p9_fid_destroy(afid); | |
bd238fb4 LI |
877 | return ERR_PTR(err); |
878 | } | |
879 | EXPORT_SYMBOL(p9_client_auth); | |
880 | ||
881 | struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames, | |
882 | int clone) | |
883 | { | |
884 | int err; | |
bd238fb4 LI |
885 | struct p9_client *clnt; |
886 | struct p9_fid *fid; | |
51a87c55 EVH |
887 | struct p9_qid *wqids; |
888 | struct p9_req_t *req; | |
889 | int16_t nwqids, count; | |
bd238fb4 | 890 | |
bd238fb4 | 891 | err = 0; |
bd238fb4 LI |
892 | clnt = oldfid->clnt; |
893 | if (clone) { | |
894 | fid = p9_fid_create(clnt); | |
895 | if (IS_ERR(fid)) { | |
896 | err = PTR_ERR(fid); | |
897 | fid = NULL; | |
898 | goto error; | |
899 | } | |
900 | ||
901 | fid->uid = oldfid->uid; | |
902 | } else | |
903 | fid = oldfid; | |
904 | ||
51a87c55 EVH |
905 | |
906 | P9_DPRINTK(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %d wname[0] %s\n", | |
907 | oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); | |
908 | ||
909 | req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, | |
910 | nwname, wnames); | |
911 | if (IS_ERR(req)) { | |
912 | err = PTR_ERR(req); | |
bd238fb4 LI |
913 | goto error; |
914 | } | |
915 | ||
51a87c55 | 916 | err = p9pdu_readf(req->rc, clnt->dotu, "R", &nwqids, &wqids); |
e7f4b8f1 EVH |
917 | if (err) { |
918 | p9pdu_dump(1, req->rc); | |
919 | p9_free_req(clnt, req); | |
51a87c55 | 920 | goto clunk_fid; |
e7f4b8f1 EVH |
921 | } |
922 | p9_free_req(clnt, req); | |
bd238fb4 | 923 | |
51a87c55 EVH |
924 | P9_DPRINTK(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); |
925 | ||
926 | if (nwqids != nwname) { | |
bd238fb4 LI |
927 | err = -ENOENT; |
928 | goto clunk_fid; | |
929 | } | |
930 | ||
51a87c55 EVH |
931 | for (count = 0; count < nwqids; count++) |
932 | P9_DPRINTK(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", | |
933 | count, wqids[count].type, wqids[count].path, | |
934 | wqids[count].version); | |
935 | ||
bd238fb4 | 936 | if (nwname) |
51a87c55 | 937 | memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); |
bd238fb4 LI |
938 | else |
939 | fid->qid = oldfid->qid; | |
940 | ||
bd238fb4 LI |
941 | return fid; |
942 | ||
943 | clunk_fid: | |
51a87c55 EVH |
944 | p9_client_clunk(fid); |
945 | fid = NULL; | |
bd238fb4 LI |
946 | |
947 | error: | |
bd238fb4 LI |
948 | if (fid && (fid != oldfid)) |
949 | p9_fid_destroy(fid); | |
950 | ||
951 | return ERR_PTR(err); | |
952 | } | |
953 | EXPORT_SYMBOL(p9_client_walk); | |
954 | ||
955 | int p9_client_open(struct p9_fid *fid, int mode) | |
956 | { | |
957 | int err; | |
bd238fb4 | 958 | struct p9_client *clnt; |
51a87c55 EVH |
959 | struct p9_req_t *req; |
960 | struct p9_qid qid; | |
961 | int iounit; | |
bd238fb4 | 962 | |
51a87c55 | 963 | P9_DPRINTK(P9_DEBUG_9P, ">>> TOPEN fid %d mode %d\n", fid->fid, mode); |
bd238fb4 | 964 | err = 0; |
bd238fb4 LI |
965 | clnt = fid->clnt; |
966 | ||
967 | if (fid->mode != -1) | |
968 | return -EINVAL; | |
969 | ||
51a87c55 EVH |
970 | req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); |
971 | if (IS_ERR(req)) { | |
972 | err = PTR_ERR(req); | |
973 | goto error; | |
bd238fb4 LI |
974 | } |
975 | ||
51a87c55 | 976 | err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit); |
e7f4b8f1 EVH |
977 | if (err) { |
978 | p9pdu_dump(1, req->rc); | |
979 | goto free_and_error; | |
980 | } | |
51a87c55 EVH |
981 | |
982 | P9_DPRINTK(P9_DEBUG_9P, "<<< ROPEN qid %x.%llx.%x iounit %x\n", | |
983 | qid.type, qid.path, qid.version, iounit); | |
bd238fb4 LI |
984 | |
985 | fid->mode = mode; | |
51a87c55 | 986 | fid->iounit = iounit; |
bd238fb4 | 987 | |
e7f4b8f1 EVH |
988 | free_and_error: |
989 | p9_free_req(clnt, req); | |
51a87c55 | 990 | error: |
bd238fb4 LI |
991 | return err; |
992 | } | |
993 | EXPORT_SYMBOL(p9_client_open); | |
994 | ||
995 | int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode, | |
996 | char *extension) | |
997 | { | |
998 | int err; | |
bd238fb4 | 999 | struct p9_client *clnt; |
51a87c55 EVH |
1000 | struct p9_req_t *req; |
1001 | struct p9_qid qid; | |
1002 | int iounit; | |
bd238fb4 | 1003 | |
51a87c55 EVH |
1004 | P9_DPRINTK(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", |
1005 | fid->fid, name, perm, mode); | |
bd238fb4 | 1006 | err = 0; |
bd238fb4 LI |
1007 | clnt = fid->clnt; |
1008 | ||
1009 | if (fid->mode != -1) | |
1010 | return -EINVAL; | |
1011 | ||
51a87c55 EVH |
1012 | req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, |
1013 | mode, extension); | |
1014 | if (IS_ERR(req)) { | |
1015 | err = PTR_ERR(req); | |
1016 | goto error; | |
bd238fb4 LI |
1017 | } |
1018 | ||
51a87c55 | 1019 | err = p9pdu_readf(req->rc, clnt->dotu, "Qd", &qid, &iounit); |
e7f4b8f1 EVH |
1020 | if (err) { |
1021 | p9pdu_dump(1, req->rc); | |
1022 | goto free_and_error; | |
1023 | } | |
51a87c55 EVH |
1024 | |
1025 | P9_DPRINTK(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", | |
1026 | qid.type, qid.path, qid.version, iounit); | |
bd238fb4 LI |
1027 | |
1028 | fid->mode = mode; | |
51a87c55 | 1029 | fid->iounit = iounit; |
bd238fb4 | 1030 | |
e7f4b8f1 EVH |
1031 | free_and_error: |
1032 | p9_free_req(clnt, req); | |
51a87c55 | 1033 | error: |
bd238fb4 LI |
1034 | return err; |
1035 | } | |
1036 | EXPORT_SYMBOL(p9_client_fcreate); | |
1037 | ||
1038 | int p9_client_clunk(struct p9_fid *fid) | |
1039 | { | |
1040 | int err; | |
bd238fb4 | 1041 | struct p9_client *clnt; |
51a87c55 | 1042 | struct p9_req_t *req; |
bd238fb4 | 1043 | |
51a87c55 | 1044 | P9_DPRINTK(P9_DEBUG_9P, ">>> TCLUNK fid %d\n", fid->fid); |
bd238fb4 | 1045 | err = 0; |
bd238fb4 LI |
1046 | clnt = fid->clnt; |
1047 | ||
51a87c55 EVH |
1048 | req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); |
1049 | if (IS_ERR(req)) { | |
1050 | err = PTR_ERR(req); | |
1051 | goto error; | |
bd238fb4 LI |
1052 | } |
1053 | ||
51a87c55 | 1054 | P9_DPRINTK(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); |
bd238fb4 | 1055 | |
51a87c55 | 1056 | p9_free_req(clnt, req); |
bd238fb4 LI |
1057 | p9_fid_destroy(fid); |
1058 | ||
51a87c55 | 1059 | error: |
bd238fb4 LI |
1060 | return err; |
1061 | } | |
1062 | EXPORT_SYMBOL(p9_client_clunk); | |
1063 | ||
1064 | int p9_client_remove(struct p9_fid *fid) | |
1065 | { | |
1066 | int err; | |
bd238fb4 | 1067 | struct p9_client *clnt; |
51a87c55 | 1068 | struct p9_req_t *req; |
bd238fb4 | 1069 | |
51a87c55 | 1070 | P9_DPRINTK(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); |
bd238fb4 | 1071 | err = 0; |
bd238fb4 LI |
1072 | clnt = fid->clnt; |
1073 | ||
51a87c55 EVH |
1074 | req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); |
1075 | if (IS_ERR(req)) { | |
1076 | err = PTR_ERR(req); | |
1077 | goto error; | |
bd238fb4 LI |
1078 | } |
1079 | ||
51a87c55 | 1080 | P9_DPRINTK(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); |
bd238fb4 | 1081 | |
51a87c55 | 1082 | p9_free_req(clnt, req); |
bd238fb4 LI |
1083 | p9_fid_destroy(fid); |
1084 | ||
51a87c55 | 1085 | error: |
bd238fb4 LI |
1086 | return err; |
1087 | } | |
1088 | EXPORT_SYMBOL(p9_client_remove); | |
1089 | ||
0fc9655e EVH |
1090 | int |
1091 | p9_client_read(struct p9_fid *fid, char *data, char __user *udata, u64 offset, | |
1092 | u32 count) | |
bd238fb4 | 1093 | { |
51a87c55 | 1094 | int err, rsize, total; |
bd238fb4 | 1095 | struct p9_client *clnt; |
51a87c55 EVH |
1096 | struct p9_req_t *req; |
1097 | char *dataptr; | |
bd238fb4 | 1098 | |
51a87c55 | 1099 | P9_DPRINTK(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", fid->fid, |
bd238fb4 LI |
1100 | (long long unsigned) offset, count); |
1101 | err = 0; | |
bd238fb4 LI |
1102 | clnt = fid->clnt; |
1103 | total = 0; | |
1104 | ||
1105 | rsize = fid->iounit; | |
1106 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) | |
1107 | rsize = clnt->msize - P9_IOHDRSZ; | |
1108 | ||
51a87c55 EVH |
1109 | if (count < rsize) |
1110 | rsize = count; | |
bd238fb4 | 1111 | |
51a87c55 EVH |
1112 | req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, rsize); |
1113 | if (IS_ERR(req)) { | |
1114 | err = PTR_ERR(req); | |
1115 | goto error; | |
1116 | } | |
bd238fb4 | 1117 | |
51a87c55 | 1118 | err = p9pdu_readf(req->rc, clnt->dotu, "D", &count, &dataptr); |
e7f4b8f1 EVH |
1119 | if (err) { |
1120 | p9pdu_dump(1, req->rc); | |
51a87c55 | 1121 | goto free_and_error; |
e7f4b8f1 | 1122 | } |
bd238fb4 | 1123 | |
51a87c55 | 1124 | P9_DPRINTK(P9_DEBUG_9P, "<<< RREAD count %d\n", count); |
bd238fb4 | 1125 | |
51a87c55 EVH |
1126 | if (data) { |
1127 | memmove(data, dataptr, count); | |
1128 | data += count; | |
1129 | } | |
bd238fb4 | 1130 | |
51a87c55 EVH |
1131 | if (udata) { |
1132 | err = copy_to_user(udata, dataptr, count); | |
1133 | if (err) { | |
1134 | err = -EFAULT; | |
1135 | goto free_and_error; | |
bd238fb4 | 1136 | } |
51a87c55 | 1137 | } |
bd238fb4 | 1138 | |
51a87c55 EVH |
1139 | p9_free_req(clnt, req); |
1140 | return count; | |
bd238fb4 | 1141 | |
51a87c55 EVH |
1142 | free_and_error: |
1143 | p9_free_req(clnt, req); | |
bd238fb4 | 1144 | error: |
bd238fb4 LI |
1145 | return err; |
1146 | } | |
0fc9655e | 1147 | EXPORT_SYMBOL(p9_client_read); |
bd238fb4 LI |
1148 | |
1149 | int | |
0fc9655e EVH |
1150 | p9_client_write(struct p9_fid *fid, char *data, const char __user *udata, |
1151 | u64 offset, u32 count) | |
bd238fb4 | 1152 | { |
51a87c55 | 1153 | int err, rsize, total; |
bd238fb4 | 1154 | struct p9_client *clnt; |
51a87c55 | 1155 | struct p9_req_t *req; |
bd238fb4 | 1156 | |
51a87c55 EVH |
1157 | P9_DPRINTK(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %d\n", |
1158 | fid->fid, (long long unsigned) offset, count); | |
bd238fb4 | 1159 | err = 0; |
bd238fb4 LI |
1160 | clnt = fid->clnt; |
1161 | total = 0; | |
1162 | ||
1163 | rsize = fid->iounit; | |
1164 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) | |
1165 | rsize = clnt->msize - P9_IOHDRSZ; | |
1166 | ||
51a87c55 EVH |
1167 | if (count < rsize) |
1168 | rsize = count; | |
1169 | if (data) | |
1170 | req = p9_client_rpc(clnt, P9_TWRITE, "dqD", fid->fid, offset, | |
1171 | rsize, data); | |
1172 | else | |
1173 | req = p9_client_rpc(clnt, P9_TWRITE, "dqU", fid->fid, offset, | |
1174 | rsize, udata); | |
1175 | if (IS_ERR(req)) { | |
1176 | err = PTR_ERR(req); | |
1177 | goto error; | |
1178 | } | |
0fc9655e | 1179 | |
51a87c55 | 1180 | err = p9pdu_readf(req->rc, clnt->dotu, "d", &count); |
e7f4b8f1 EVH |
1181 | if (err) { |
1182 | p9pdu_dump(1, req->rc); | |
51a87c55 | 1183 | goto free_and_error; |
e7f4b8f1 EVH |
1184 | } |
1185 | ||
51a87c55 | 1186 | P9_DPRINTK(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); |
bd238fb4 | 1187 | |
51a87c55 EVH |
1188 | p9_free_req(clnt, req); |
1189 | return count; | |
bd238fb4 | 1190 | |
51a87c55 EVH |
1191 | free_and_error: |
1192 | p9_free_req(clnt, req); | |
bd238fb4 | 1193 | error: |
bd238fb4 LI |
1194 | return err; |
1195 | } | |
0fc9655e | 1196 | EXPORT_SYMBOL(p9_client_write); |
bd238fb4 | 1197 | |
51a87c55 | 1198 | struct p9_wstat *p9_client_stat(struct p9_fid *fid) |
5503ac56 | 1199 | { |
51a87c55 EVH |
1200 | int err; |
1201 | struct p9_client *clnt; | |
1202 | struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); | |
1203 | struct p9_req_t *req; | |
1204 | u16 ignored; | |
5503ac56 | 1205 | |
51a87c55 | 1206 | P9_DPRINTK(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); |
5503ac56 | 1207 | |
5503ac56 EVH |
1208 | if (!ret) |
1209 | return ERR_PTR(-ENOMEM); | |
1210 | ||
bd238fb4 | 1211 | err = 0; |
bd238fb4 LI |
1212 | clnt = fid->clnt; |
1213 | ||
51a87c55 EVH |
1214 | req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); |
1215 | if (IS_ERR(req)) { | |
1216 | err = PTR_ERR(req); | |
bd238fb4 LI |
1217 | goto error; |
1218 | } | |
1219 | ||
51a87c55 | 1220 | err = p9pdu_readf(req->rc, clnt->dotu, "wS", &ignored, ret); |
e7f4b8f1 EVH |
1221 | if (err) { |
1222 | ret = ERR_PTR(err); | |
1223 | p9pdu_dump(1, req->rc); | |
1224 | goto free_and_error; | |
1225 | } | |
bd238fb4 | 1226 | |
51a87c55 | 1227 | P9_DPRINTK(P9_DEBUG_9P, |
e7f4b8f1 EVH |
1228 | "<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" |
1229 | "<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" | |
1230 | "<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" | |
1231 | "<<< uid=%d gid=%d n_muid=%d\n", | |
51a87c55 | 1232 | ret->size, ret->type, ret->dev, ret->qid.type, |
e7f4b8f1 EVH |
1233 | ret->qid.path, ret->qid.version, ret->mode, |
1234 | ret->atime, ret->mtime, ret->length, ret->name, | |
1235 | ret->uid, ret->gid, ret->muid, ret->extension, | |
1236 | ret->n_uid, ret->n_gid, ret->n_muid); | |
bd238fb4 | 1237 | |
e7f4b8f1 EVH |
1238 | free_and_error: |
1239 | p9_free_req(clnt, req); | |
bd238fb4 | 1240 | error: |
e7f4b8f1 | 1241 | return ret; |
bd238fb4 LI |
1242 | } |
1243 | EXPORT_SYMBOL(p9_client_stat); | |
1244 | ||
1245 | int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) | |
1246 | { | |
1247 | int err; | |
51a87c55 | 1248 | struct p9_req_t *req; |
bd238fb4 LI |
1249 | struct p9_client *clnt; |
1250 | ||
51a87c55 | 1251 | P9_DPRINTK(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); |
e7f4b8f1 EVH |
1252 | P9_DPRINTK(P9_DEBUG_9P, |
1253 | " sz=%x type=%x dev=%x qid=%x.%llx.%x\n" | |
1254 | " mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" | |
1255 | " name=%s uid=%s gid=%s muid=%s extension=(%s)\n" | |
1256 | " uid=%d gid=%d n_muid=%d\n", | |
1257 | wst->size, wst->type, wst->dev, wst->qid.type, | |
1258 | wst->qid.path, wst->qid.version, wst->mode, | |
1259 | wst->atime, wst->mtime, wst->length, wst->name, | |
1260 | wst->uid, wst->gid, wst->muid, wst->extension, | |
1261 | wst->n_uid, wst->n_gid, wst->n_muid); | |
bd238fb4 | 1262 | err = 0; |
bd238fb4 LI |
1263 | clnt = fid->clnt; |
1264 | ||
51a87c55 EVH |
1265 | req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, 0, wst); |
1266 | if (IS_ERR(req)) { | |
1267 | err = PTR_ERR(req); | |
1268 | goto error; | |
bd238fb4 LI |
1269 | } |
1270 | ||
51a87c55 | 1271 | P9_DPRINTK(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); |
bd238fb4 | 1272 | |
51a87c55 EVH |
1273 | p9_free_req(clnt, req); |
1274 | error: | |
bd238fb4 LI |
1275 | return err; |
1276 | } | |
1277 | EXPORT_SYMBOL(p9_client_wstat); |