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> |
bd238fb4 | 38 | |
8a0dc95f EVH |
39 | /* |
40 | * Client Option Parsing (code inspired by NFS code) | |
41 | * - a little lazy - parse all client options | |
42 | */ | |
43 | ||
44 | enum { | |
45 | Opt_msize, | |
46 | Opt_trans, | |
47 | Opt_legacy, | |
48 | Opt_err, | |
49 | }; | |
50 | ||
a447c093 | 51 | static const match_table_t tokens = { |
8a0dc95f EVH |
52 | {Opt_msize, "msize=%u"}, |
53 | {Opt_legacy, "noextend"}, | |
54 | {Opt_trans, "trans=%s"}, | |
55 | {Opt_err, NULL}, | |
56 | }; | |
57 | ||
91b8534f EVH |
58 | static int |
59 | p9_client_rpc(struct p9_client *c, struct p9_fcall *tc, struct p9_fcall **rc); | |
60 | ||
8a0dc95f EVH |
61 | /** |
62 | * v9fs_parse_options - parse mount options into session structure | |
63 | * @options: options string passed from mount | |
64 | * @v9ses: existing v9fs session information | |
65 | * | |
bb8ffdfc | 66 | * Return 0 upon success, -ERRNO upon failure |
8a0dc95f EVH |
67 | */ |
68 | ||
bb8ffdfc | 69 | static int parse_opts(char *opts, struct p9_client *clnt) |
8a0dc95f | 70 | { |
bb8ffdfc | 71 | char *options; |
8a0dc95f EVH |
72 | char *p; |
73 | substring_t args[MAX_OPT_ARGS]; | |
74 | int option; | |
bb8ffdfc | 75 | int ret = 0; |
8a0dc95f | 76 | |
8a0dc95f EVH |
77 | clnt->dotu = 1; |
78 | clnt->msize = 8192; | |
79 | ||
bb8ffdfc EVH |
80 | if (!opts) |
81 | return 0; | |
82 | ||
83 | options = kstrdup(opts, GFP_KERNEL); | |
84 | if (!options) { | |
85 | P9_DPRINTK(P9_DEBUG_ERROR, | |
86 | "failed to allocate copy of option string\n"); | |
87 | return -ENOMEM; | |
88 | } | |
8a0dc95f EVH |
89 | |
90 | while ((p = strsep(&options, ",")) != NULL) { | |
91 | int token; | |
92 | if (!*p) | |
93 | continue; | |
94 | token = match_token(p, tokens, args); | |
95 | if (token < Opt_trans) { | |
bb8ffdfc EVH |
96 | int r = match_int(&args[0], &option); |
97 | if (r < 0) { | |
8a0dc95f EVH |
98 | P9_DPRINTK(P9_DEBUG_ERROR, |
99 | "integer field, but no integer?\n"); | |
bb8ffdfc | 100 | ret = r; |
8a0dc95f EVH |
101 | continue; |
102 | } | |
103 | } | |
104 | switch (token) { | |
105 | case Opt_msize: | |
106 | clnt->msize = option; | |
107 | break; | |
108 | case Opt_trans: | |
72029fe8 | 109 | clnt->trans_mod = v9fs_get_trans_by_name(&args[0]); |
8a0dc95f EVH |
110 | break; |
111 | case Opt_legacy: | |
112 | clnt->dotu = 0; | |
113 | break; | |
114 | default: | |
115 | continue; | |
116 | } | |
117 | } | |
72029fe8 TH |
118 | |
119 | if (!clnt->trans_mod) | |
120 | clnt->trans_mod = v9fs_get_default_trans(); | |
121 | ||
bb8ffdfc EVH |
122 | kfree(options); |
123 | return ret; | |
8a0dc95f EVH |
124 | } |
125 | ||
fea511a6 EVH |
126 | /** |
127 | * p9_tag_alloc - lookup/allocate a request by tag | |
128 | * @c: client session to lookup tag within | |
129 | * @tag: numeric id for transaction | |
130 | * | |
131 | * this is a simple array lookup, but will grow the | |
132 | * request_slots as necessary to accomodate transaction | |
133 | * ids which did not previously have a slot. | |
134 | * | |
135 | * this code relies on the client spinlock to manage locks, its | |
136 | * possible we should switch to something else, but I'd rather | |
137 | * stick with something low-overhead for the common case. | |
138 | * | |
139 | */ | |
140 | ||
141 | struct p9_req_t *p9_tag_alloc(struct p9_client *c, u16 tag) | |
142 | { | |
143 | unsigned long flags; | |
144 | int row, col; | |
145 | ||
146 | /* This looks up the original request by tag so we know which | |
147 | * buffer to read the data into */ | |
148 | tag++; | |
149 | ||
150 | if (tag >= c->max_tag) { | |
151 | spin_lock_irqsave(&c->lock, flags); | |
152 | /* check again since original check was outside of lock */ | |
153 | while (tag >= c->max_tag) { | |
154 | row = (tag / P9_ROW_MAXTAG); | |
155 | c->reqs[row] = kcalloc(P9_ROW_MAXTAG, | |
156 | sizeof(struct p9_req_t), GFP_ATOMIC); | |
157 | ||
158 | if (!c->reqs[row]) { | |
159 | printk(KERN_ERR "Couldn't grow tag array\n"); | |
160 | BUG(); | |
161 | } | |
162 | for (col = 0; col < P9_ROW_MAXTAG; col++) { | |
163 | c->reqs[row][col].status = REQ_STATUS_IDLE; | |
164 | c->reqs[row][col].flush_tag = P9_NOTAG; | |
165 | c->reqs[row][col].wq = kmalloc( | |
166 | sizeof(wait_queue_head_t), GFP_ATOMIC); | |
167 | if (!c->reqs[row][col].wq) { | |
168 | printk(KERN_ERR | |
169 | "Couldn't grow tag array\n"); | |
170 | BUG(); | |
171 | } | |
172 | init_waitqueue_head(c->reqs[row][col].wq); | |
173 | } | |
174 | c->max_tag += P9_ROW_MAXTAG; | |
175 | } | |
176 | spin_unlock_irqrestore(&c->lock, flags); | |
177 | } | |
178 | row = tag / P9_ROW_MAXTAG; | |
179 | col = tag % P9_ROW_MAXTAG; | |
180 | ||
181 | c->reqs[row][col].status = REQ_STATUS_ALLOC; | |
182 | c->reqs[row][col].flush_tag = P9_NOTAG; | |
183 | ||
184 | return &c->reqs[row][col]; | |
185 | } | |
186 | EXPORT_SYMBOL(p9_tag_alloc); | |
187 | ||
188 | /** | |
189 | * p9_tag_lookup - lookup a request by tag | |
190 | * @c: client session to lookup tag within | |
191 | * @tag: numeric id for transaction | |
192 | * | |
193 | */ | |
194 | ||
195 | struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) | |
196 | { | |
197 | int row, col; | |
198 | ||
199 | /* This looks up the original request by tag so we know which | |
200 | * buffer to read the data into */ | |
201 | tag++; | |
202 | ||
203 | BUG_ON(tag >= c->max_tag); | |
204 | ||
205 | row = tag / P9_ROW_MAXTAG; | |
206 | col = tag % P9_ROW_MAXTAG; | |
207 | ||
208 | return &c->reqs[row][col]; | |
209 | } | |
210 | EXPORT_SYMBOL(p9_tag_lookup); | |
211 | ||
212 | /** | |
213 | * p9_tag_init - setup tags structure and contents | |
214 | * @tags: tags structure from the client struct | |
215 | * | |
216 | * This initializes the tags structure for each client instance. | |
217 | * | |
218 | */ | |
219 | ||
220 | static int p9_tag_init(struct p9_client *c) | |
221 | { | |
222 | int err = 0; | |
223 | ||
224 | c->tagpool = p9_idpool_create(); | |
225 | if (IS_ERR(c->tagpool)) { | |
226 | err = PTR_ERR(c->tagpool); | |
227 | c->tagpool = NULL; | |
228 | goto error; | |
229 | } | |
230 | ||
231 | p9_idpool_get(c->tagpool); /* reserve tag 0 */ | |
232 | ||
233 | c->max_tag = 0; | |
234 | error: | |
235 | return err; | |
236 | } | |
237 | ||
238 | /** | |
239 | * p9_tag_cleanup - cleans up tags structure and reclaims resources | |
240 | * @tags: tags structure from the client struct | |
241 | * | |
242 | * This frees resources associated with the tags structure | |
243 | * | |
244 | */ | |
245 | static void p9_tag_cleanup(struct p9_client *c) | |
246 | { | |
247 | int row, col; | |
248 | ||
249 | /* check to insure all requests are idle */ | |
250 | for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { | |
251 | for (col = 0; col < P9_ROW_MAXTAG; col++) { | |
252 | if (c->reqs[row][col].status != REQ_STATUS_IDLE) { | |
253 | P9_DPRINTK(P9_DEBUG_MUX, | |
254 | "Attempting to cleanup non-free tag %d,%d\n", | |
255 | row, col); | |
256 | /* TODO: delay execution of cleanup */ | |
257 | return; | |
258 | } | |
259 | } | |
260 | } | |
261 | ||
262 | if (c->tagpool) | |
263 | p9_idpool_destroy(c->tagpool); | |
264 | ||
265 | /* free requests associated with tags */ | |
266 | for (row = 0; row < (c->max_tag/P9_ROW_MAXTAG); row++) { | |
267 | for (col = 0; col < P9_ROW_MAXTAG; col++) | |
268 | kfree(c->reqs[row][col].wq); | |
269 | kfree(c->reqs[row]); | |
270 | } | |
271 | c->max_tag = 0; | |
272 | } | |
273 | ||
91b8534f EVH |
274 | /** |
275 | * p9_client_flush - flush (cancel) a request | |
276 | * c: client state | |
277 | * req: request to cancel | |
278 | * | |
279 | * This sents a flush for a particular requests and links | |
280 | * the flush request to the original request. The current | |
281 | * code only supports a single flush request although the protocol | |
282 | * allows for multiple flush requests to be sent for a single request. | |
283 | * | |
284 | */ | |
285 | ||
286 | static int p9_client_flush(struct p9_client *c, struct p9_req_t *req) | |
287 | { | |
288 | struct p9_fcall *tc, *rc = NULL; | |
289 | int err; | |
290 | ||
291 | P9_DPRINTK(P9_DEBUG_9P, "client %p tag %d\n", c, req->tc->tag); | |
292 | ||
293 | tc = p9_create_tflush(req->tc->tag); | |
294 | if (IS_ERR(tc)) | |
295 | return PTR_ERR(tc); | |
296 | ||
297 | err = p9_client_rpc(c, tc, &rc); | |
298 | ||
299 | /* we don't free anything here because RPC isn't complete */ | |
300 | ||
301 | return err; | |
302 | } | |
303 | ||
673d62cd EVH |
304 | /** |
305 | * p9_free_req - free a request and clean-up as necessary | |
306 | * c: client state | |
307 | * r: request to release | |
308 | * | |
309 | */ | |
310 | ||
311 | void p9_free_req(struct p9_client *c, struct p9_req_t *r) | |
312 | { | |
313 | r->flush_tag = P9_NOTAG; | |
314 | r->status = REQ_STATUS_IDLE; | |
315 | if (r->tc->tag != P9_NOTAG && p9_idpool_check(r->tc->tag, c->tagpool)) | |
316 | p9_idpool_put(r->tc->tag, c->tagpool); | |
317 | ||
318 | /* if this was a flush request we have to free response fcall */ | |
319 | if (r->tc->id == P9_TFLUSH) { | |
320 | kfree(r->tc); | |
321 | kfree(r->rc); | |
322 | } | |
323 | } | |
324 | ||
91b8534f EVH |
325 | /** |
326 | * p9_client_cb - call back from transport to client | |
327 | * c: client state | |
328 | * req: request received | |
329 | * | |
330 | */ | |
331 | void p9_client_cb(struct p9_client *c, struct p9_req_t *req) | |
332 | { | |
333 | struct p9_req_t *other_req; | |
334 | unsigned long flags; | |
335 | ||
336 | P9_DPRINTK(P9_DEBUG_MUX, ": %d\n", req->tc->tag); | |
337 | ||
338 | if (req->status == REQ_STATUS_ERROR) | |
339 | wake_up(req->wq); | |
340 | ||
341 | if (req->tc->id == P9_TFLUSH) { /* flush receive path */ | |
342 | P9_DPRINTK(P9_DEBUG_MUX, "flush: %d\n", req->tc->tag); | |
343 | spin_lock_irqsave(&c->lock, flags); | |
344 | other_req = p9_tag_lookup(c, req->tc->params.tflush.oldtag); | |
345 | if (other_req->flush_tag != req->tc->tag) /* stale flush */ | |
346 | spin_unlock_irqrestore(&c->lock, flags); | |
347 | else { | |
348 | BUG_ON(other_req->status != REQ_STATUS_FLSH); | |
349 | other_req->status = REQ_STATUS_FLSHD; | |
350 | spin_unlock_irqrestore(&c->lock, flags); | |
351 | wake_up(other_req->wq); | |
352 | } | |
353 | p9_free_req(c, req); | |
354 | } else { /* normal receive path */ | |
355 | P9_DPRINTK(P9_DEBUG_MUX, "normal: %d\n", req->tc->tag); | |
356 | spin_lock_irqsave(&c->lock, flags); | |
357 | if (req->status != REQ_STATUS_FLSHD) | |
358 | req->status = REQ_STATUS_RCVD; | |
359 | req->flush_tag = P9_NOTAG; | |
360 | spin_unlock_irqrestore(&c->lock, flags); | |
361 | wake_up(req->wq); | |
362 | P9_DPRINTK(P9_DEBUG_MUX, "wakeup: %d\n", req->tc->tag); | |
363 | } | |
364 | } | |
365 | EXPORT_SYMBOL(p9_client_cb); | |
366 | ||
367 | /** | |
368 | * p9_client_rpc - issue a request and wait for a response | |
369 | * @c: client session | |
370 | * @tc: &p9_fcall request to transmit | |
371 | * @rc: &p9_fcall to put reponse into | |
372 | * | |
373 | * Returns 0 on success, error code on failure | |
374 | */ | |
375 | ||
376 | static int | |
377 | p9_client_rpc(struct p9_client *c, struct p9_fcall *tc, struct p9_fcall **rc) | |
378 | { | |
379 | int tag, err, size; | |
380 | char *rdata; | |
381 | struct p9_req_t *req; | |
382 | unsigned long flags; | |
383 | int sigpending; | |
384 | int flushed = 0; | |
385 | ||
386 | P9_DPRINTK(P9_DEBUG_9P, "client %p tc %p rc %p\n", c, tc, rc); | |
387 | ||
388 | if (c->status != Connected) | |
389 | return -EIO; | |
390 | ||
391 | if (signal_pending(current)) { | |
392 | sigpending = 1; | |
393 | clear_thread_flag(TIF_SIGPENDING); | |
394 | } else | |
395 | sigpending = 0; | |
396 | ||
397 | tag = P9_NOTAG; | |
398 | if (tc->id != P9_TVERSION) { | |
399 | tag = p9_idpool_get(c->tagpool); | |
400 | if (tag < 0) | |
401 | return -ENOMEM; | |
402 | } | |
403 | ||
404 | req = p9_tag_alloc(c, tag); | |
405 | ||
406 | /* if this is a flush request, backlink flush request now to | |
407 | * avoid race conditions later. */ | |
408 | if (tc->id == P9_TFLUSH) { | |
409 | struct p9_req_t *other_req = | |
410 | p9_tag_lookup(c, tc->params.tflush.oldtag); | |
411 | if (other_req->status == REQ_STATUS_FLSH) | |
412 | other_req->flush_tag = tag; | |
413 | } | |
414 | ||
415 | p9_set_tag(tc, tag); | |
416 | ||
417 | /* | |
418 | * if client passed in a pre-allocated response fcall struct | |
419 | * then we just use that, otherwise we allocate one. | |
420 | */ | |
421 | ||
422 | if (rc == NULL) | |
423 | req->rc = NULL; | |
424 | else | |
425 | req->rc = *rc; | |
426 | if (req->rc == NULL) { | |
427 | req->rc = kmalloc(sizeof(struct p9_fcall) + c->msize, | |
428 | GFP_KERNEL); | |
429 | if (!req->rc) { | |
430 | err = -ENOMEM; | |
431 | p9_idpool_put(tag, c->tagpool); | |
432 | p9_free_req(c, req); | |
433 | goto reterr; | |
434 | } | |
435 | *rc = req->rc; | |
436 | } | |
437 | ||
438 | rdata = (char *)req->rc+sizeof(struct p9_fcall); | |
439 | ||
440 | req->tc = tc; | |
441 | P9_DPRINTK(P9_DEBUG_9P, "request: tc: %p rc: %p\n", req->tc, req->rc); | |
442 | ||
443 | err = c->trans_mod->request(c, req); | |
444 | if (err < 0) { | |
445 | c->status = Disconnected; | |
446 | goto reterr; | |
447 | } | |
448 | ||
449 | /* if it was a flush we just transmitted, return our tag */ | |
450 | if (tc->id == P9_TFLUSH) | |
451 | return 0; | |
452 | again: | |
453 | P9_DPRINTK(P9_DEBUG_9P, "wait %p tag: %d\n", req->wq, tag); | |
454 | err = wait_event_interruptible(*req->wq, | |
455 | req->status >= REQ_STATUS_RCVD); | |
456 | P9_DPRINTK(P9_DEBUG_9P, "wait %p tag: %d returned %d (flushed=%d)\n", | |
457 | req->wq, tag, err, flushed); | |
458 | ||
459 | if (req->status == REQ_STATUS_ERROR) { | |
460 | P9_DPRINTK(P9_DEBUG_9P, "req_status error %d\n", req->t_err); | |
461 | err = req->t_err; | |
462 | } else if (err == -ERESTARTSYS && flushed) { | |
463 | P9_DPRINTK(P9_DEBUG_9P, "flushed - going again\n"); | |
464 | goto again; | |
465 | } else if (req->status == REQ_STATUS_FLSHD) { | |
466 | P9_DPRINTK(P9_DEBUG_9P, "flushed - erestartsys\n"); | |
467 | err = -ERESTARTSYS; | |
468 | } | |
469 | ||
470 | if ((err == -ERESTARTSYS) && (c->status == Connected) && (!flushed)) { | |
471 | P9_DPRINTK(P9_DEBUG_9P, "flushing\n"); | |
472 | spin_lock_irqsave(&c->lock, flags); | |
473 | if (req->status == REQ_STATUS_SENT) | |
474 | req->status = REQ_STATUS_FLSH; | |
475 | spin_unlock_irqrestore(&c->lock, flags); | |
476 | sigpending = 1; | |
477 | flushed = 1; | |
478 | clear_thread_flag(TIF_SIGPENDING); | |
479 | ||
480 | if (c->trans_mod->cancel(c, req)) { | |
481 | err = p9_client_flush(c, req); | |
482 | if (err == 0) | |
483 | goto again; | |
484 | } | |
485 | } | |
486 | ||
487 | if (sigpending) { | |
488 | spin_lock_irqsave(¤t->sighand->siglock, flags); | |
489 | recalc_sigpending(); | |
490 | spin_unlock_irqrestore(¤t->sighand->siglock, flags); | |
491 | } | |
492 | ||
493 | if (err < 0) | |
494 | goto reterr; | |
495 | ||
496 | size = le32_to_cpu(*(__le32 *) rdata); | |
497 | ||
498 | err = p9_deserialize_fcall(rdata, size, req->rc, c->dotu); | |
499 | if (err < 0) { | |
500 | P9_DPRINTK(P9_DEBUG_9P, | |
501 | "9p debug: client rpc deserialize returned %d\n", err); | |
502 | goto reterr; | |
503 | } | |
504 | ||
505 | #ifdef CONFIG_NET_9P_DEBUG | |
506 | if ((p9_debug_level&P9_DEBUG_FCALL) == P9_DEBUG_FCALL) { | |
507 | char buf[150]; | |
508 | ||
509 | p9_printfcall(buf, sizeof(buf), req->rc, c->dotu); | |
510 | printk(KERN_NOTICE ">>> %p %s\n", c, buf); | |
511 | } | |
512 | #endif | |
513 | ||
514 | if (req->rc->id == P9_RERROR) { | |
515 | int ecode = req->rc->params.rerror.errno; | |
516 | struct p9_str *ename = &req->rc->params.rerror.error; | |
517 | ||
518 | P9_DPRINTK(P9_DEBUG_MUX, "Rerror %.*s\n", ename->len, | |
519 | ename->str); | |
520 | ||
521 | if (c->dotu) | |
522 | err = -ecode; | |
523 | ||
524 | if (!err) { | |
525 | err = p9_errstr2errno(ename->str, ename->len); | |
526 | ||
527 | /* string match failed */ | |
528 | if (!err) { | |
529 | PRINT_FCALL_ERROR("unknown error", req->rc); | |
530 | err = -ESERVERFAULT; | |
531 | } | |
532 | } | |
533 | } else | |
534 | err = 0; | |
535 | ||
536 | reterr: | |
537 | p9_free_req(c, req); | |
538 | ||
539 | P9_DPRINTK(P9_DEBUG_9P, "returning %d\n", err); | |
540 | return err; | |
541 | } | |
542 | ||
5503ac56 EVH |
543 | static struct p9_fid *p9_fid_create(struct p9_client *clnt) |
544 | { | |
545 | int err; | |
546 | struct p9_fid *fid; | |
547 | ||
548 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); | |
549 | fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); | |
550 | if (!fid) | |
551 | return ERR_PTR(-ENOMEM); | |
552 | ||
553 | fid->fid = p9_idpool_get(clnt->fidpool); | |
554 | if (fid->fid < 0) { | |
555 | err = -ENOSPC; | |
556 | goto error; | |
557 | } | |
558 | ||
559 | memset(&fid->qid, 0, sizeof(struct p9_qid)); | |
560 | fid->mode = -1; | |
561 | fid->rdir_fpos = 0; | |
562 | fid->rdir_pos = 0; | |
563 | fid->rdir_fcall = NULL; | |
564 | fid->uid = current->fsuid; | |
565 | fid->clnt = clnt; | |
566 | fid->aux = NULL; | |
567 | ||
568 | spin_lock(&clnt->lock); | |
569 | list_add(&fid->flist, &clnt->fidlist); | |
570 | spin_unlock(&clnt->lock); | |
571 | ||
572 | return fid; | |
573 | ||
574 | error: | |
575 | kfree(fid); | |
576 | return ERR_PTR(err); | |
577 | } | |
578 | ||
579 | static void p9_fid_destroy(struct p9_fid *fid) | |
580 | { | |
581 | struct p9_client *clnt; | |
582 | ||
583 | P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid); | |
584 | clnt = fid->clnt; | |
585 | p9_idpool_put(fid->fid, clnt->fidpool); | |
586 | spin_lock(&clnt->lock); | |
587 | list_del(&fid->flist); | |
588 | spin_unlock(&clnt->lock); | |
589 | kfree(fid->rdir_fcall); | |
590 | kfree(fid); | |
591 | } | |
8a0dc95f | 592 | |
8a0dc95f | 593 | struct p9_client *p9_client_create(const char *dev_name, char *options) |
bd238fb4 LI |
594 | { |
595 | int err, n; | |
596 | struct p9_client *clnt; | |
597 | struct p9_fcall *tc, *rc; | |
598 | struct p9_str *version; | |
599 | ||
600 | err = 0; | |
601 | tc = NULL; | |
602 | rc = NULL; | |
603 | clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); | |
604 | if (!clnt) | |
605 | return ERR_PTR(-ENOMEM); | |
606 | ||
72029fe8 | 607 | clnt->trans_mod = NULL; |
bb8ffdfc | 608 | clnt->trans = NULL; |
bd238fb4 | 609 | spin_lock_init(&clnt->lock); |
bd238fb4 LI |
610 | INIT_LIST_HEAD(&clnt->fidlist); |
611 | clnt->fidpool = p9_idpool_create(); | |
728fc4ef | 612 | if (IS_ERR(clnt->fidpool)) { |
bd238fb4 LI |
613 | err = PTR_ERR(clnt->fidpool); |
614 | clnt->fidpool = NULL; | |
615 | goto error; | |
616 | } | |
617 | ||
fea511a6 EVH |
618 | p9_tag_init(clnt); |
619 | ||
bb8ffdfc EVH |
620 | err = parse_opts(options, clnt); |
621 | if (err < 0) | |
622 | goto error; | |
623 | ||
8a0dc95f EVH |
624 | if (clnt->trans_mod == NULL) { |
625 | err = -EPROTONOSUPPORT; | |
626 | P9_DPRINTK(P9_DEBUG_ERROR, | |
627 | "No transport defined or default transport\n"); | |
628 | goto error; | |
629 | } | |
630 | ||
631 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p trans %p msize %d dotu %d\n", | |
632 | clnt, clnt->trans_mod, clnt->msize, clnt->dotu); | |
633 | ||
634 | ||
8b81ef58 EVH |
635 | err = clnt->trans_mod->create(clnt, dev_name, options); |
636 | if (err) | |
bd238fb4 | 637 | goto error; |
bd238fb4 | 638 | |
8a0dc95f EVH |
639 | if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize) |
640 | clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ; | |
641 | ||
bd238fb4 LI |
642 | tc = p9_create_tversion(clnt->msize, clnt->dotu?"9P2000.u":"9P2000"); |
643 | if (IS_ERR(tc)) { | |
644 | err = PTR_ERR(tc); | |
645 | tc = NULL; | |
646 | goto error; | |
647 | } | |
648 | ||
e2735b77 | 649 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
650 | if (err) |
651 | goto error; | |
652 | ||
653 | version = &rc->params.rversion.version; | |
654 | if (version->len == 8 && !memcmp(version->str, "9P2000.u", 8)) | |
655 | clnt->dotu = 1; | |
656 | else if (version->len == 6 && !memcmp(version->str, "9P2000", 6)) | |
657 | clnt->dotu = 0; | |
658 | else { | |
659 | err = -EREMOTEIO; | |
660 | goto error; | |
661 | } | |
662 | ||
663 | n = rc->params.rversion.msize; | |
664 | if (n < clnt->msize) | |
665 | clnt->msize = n; | |
666 | ||
667 | kfree(tc); | |
668 | kfree(rc); | |
669 | return clnt; | |
670 | ||
671 | error: | |
672 | kfree(tc); | |
673 | kfree(rc); | |
674 | p9_client_destroy(clnt); | |
675 | return ERR_PTR(err); | |
676 | } | |
677 | EXPORT_SYMBOL(p9_client_create); | |
678 | ||
679 | void p9_client_destroy(struct p9_client *clnt) | |
680 | { | |
681 | struct p9_fid *fid, *fidptr; | |
682 | ||
683 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); | |
bd238fb4 | 684 | |
8b81ef58 EVH |
685 | if (clnt->trans_mod) |
686 | clnt->trans_mod->close(clnt); | |
bd238fb4 | 687 | |
72029fe8 TH |
688 | v9fs_put_trans(clnt->trans_mod); |
689 | ||
bd238fb4 LI |
690 | list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) |
691 | p9_fid_destroy(fid); | |
692 | ||
0af8887e EVH |
693 | if (clnt->fidpool) |
694 | p9_idpool_destroy(clnt->fidpool); | |
695 | ||
fea511a6 EVH |
696 | p9_tag_cleanup(clnt); |
697 | ||
bd238fb4 LI |
698 | kfree(clnt); |
699 | } | |
700 | EXPORT_SYMBOL(p9_client_destroy); | |
701 | ||
702 | void p9_client_disconnect(struct p9_client *clnt) | |
703 | { | |
704 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); | |
8b81ef58 | 705 | clnt->status = Disconnected; |
bd238fb4 LI |
706 | } |
707 | EXPORT_SYMBOL(p9_client_disconnect); | |
708 | ||
709 | struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, | |
ba17674f | 710 | char *uname, u32 n_uname, char *aname) |
bd238fb4 LI |
711 | { |
712 | int err; | |
713 | struct p9_fcall *tc, *rc; | |
714 | struct p9_fid *fid; | |
715 | ||
716 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p afid %d uname %s aname %s\n", | |
717 | clnt, afid?afid->fid:-1, uname, aname); | |
718 | err = 0; | |
719 | tc = NULL; | |
720 | rc = NULL; | |
721 | ||
722 | fid = p9_fid_create(clnt); | |
723 | if (IS_ERR(fid)) { | |
724 | err = PTR_ERR(fid); | |
725 | fid = NULL; | |
726 | goto error; | |
727 | } | |
728 | ||
ba17674f LI |
729 | tc = p9_create_tattach(fid->fid, afid?afid->fid:P9_NOFID, uname, aname, |
730 | n_uname, clnt->dotu); | |
bd238fb4 LI |
731 | if (IS_ERR(tc)) { |
732 | err = PTR_ERR(tc); | |
733 | tc = NULL; | |
734 | goto error; | |
735 | } | |
736 | ||
e2735b77 | 737 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
738 | if (err) |
739 | goto error; | |
740 | ||
741 | memmove(&fid->qid, &rc->params.rattach.qid, sizeof(struct p9_qid)); | |
742 | kfree(tc); | |
743 | kfree(rc); | |
744 | return fid; | |
745 | ||
746 | error: | |
747 | kfree(tc); | |
748 | kfree(rc); | |
749 | if (fid) | |
750 | p9_fid_destroy(fid); | |
751 | return ERR_PTR(err); | |
752 | } | |
753 | EXPORT_SYMBOL(p9_client_attach); | |
754 | ||
ba17674f LI |
755 | struct p9_fid *p9_client_auth(struct p9_client *clnt, char *uname, |
756 | u32 n_uname, char *aname) | |
bd238fb4 LI |
757 | { |
758 | int err; | |
759 | struct p9_fcall *tc, *rc; | |
760 | struct p9_fid *fid; | |
761 | ||
762 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p uname %s aname %s\n", clnt, uname, | |
763 | aname); | |
764 | err = 0; | |
765 | tc = NULL; | |
766 | rc = NULL; | |
767 | ||
768 | fid = p9_fid_create(clnt); | |
769 | if (IS_ERR(fid)) { | |
770 | err = PTR_ERR(fid); | |
771 | fid = NULL; | |
772 | goto error; | |
773 | } | |
774 | ||
ba17674f | 775 | tc = p9_create_tauth(fid->fid, uname, aname, n_uname, clnt->dotu); |
bd238fb4 LI |
776 | if (IS_ERR(tc)) { |
777 | err = PTR_ERR(tc); | |
778 | tc = NULL; | |
779 | goto error; | |
780 | } | |
781 | ||
e2735b77 | 782 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
783 | if (err) |
784 | goto error; | |
785 | ||
786 | memmove(&fid->qid, &rc->params.rauth.qid, sizeof(struct p9_qid)); | |
787 | kfree(tc); | |
788 | kfree(rc); | |
789 | return fid; | |
790 | ||
791 | error: | |
792 | kfree(tc); | |
793 | kfree(rc); | |
794 | if (fid) | |
795 | p9_fid_destroy(fid); | |
796 | return ERR_PTR(err); | |
797 | } | |
798 | EXPORT_SYMBOL(p9_client_auth); | |
799 | ||
800 | struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames, | |
801 | int clone) | |
802 | { | |
803 | int err; | |
804 | struct p9_fcall *tc, *rc; | |
805 | struct p9_client *clnt; | |
806 | struct p9_fid *fid; | |
807 | ||
808 | P9_DPRINTK(P9_DEBUG_9P, "fid %d nwname %d wname[0] %s\n", | |
809 | oldfid->fid, nwname, wnames?wnames[0]:NULL); | |
810 | err = 0; | |
811 | tc = NULL; | |
812 | rc = NULL; | |
813 | clnt = oldfid->clnt; | |
814 | if (clone) { | |
815 | fid = p9_fid_create(clnt); | |
816 | if (IS_ERR(fid)) { | |
817 | err = PTR_ERR(fid); | |
818 | fid = NULL; | |
819 | goto error; | |
820 | } | |
821 | ||
822 | fid->uid = oldfid->uid; | |
823 | } else | |
824 | fid = oldfid; | |
825 | ||
826 | tc = p9_create_twalk(oldfid->fid, fid->fid, nwname, wnames); | |
827 | if (IS_ERR(tc)) { | |
828 | err = PTR_ERR(tc); | |
829 | tc = NULL; | |
830 | goto error; | |
831 | } | |
832 | ||
e2735b77 | 833 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
834 | if (err) { |
835 | if (rc && rc->id == P9_RWALK) | |
836 | goto clunk_fid; | |
837 | else | |
838 | goto error; | |
839 | } | |
840 | ||
841 | if (rc->params.rwalk.nwqid != nwname) { | |
842 | err = -ENOENT; | |
843 | goto clunk_fid; | |
844 | } | |
845 | ||
846 | if (nwname) | |
847 | memmove(&fid->qid, | |
848 | &rc->params.rwalk.wqids[rc->params.rwalk.nwqid - 1], | |
849 | sizeof(struct p9_qid)); | |
850 | else | |
851 | fid->qid = oldfid->qid; | |
852 | ||
853 | kfree(tc); | |
854 | kfree(rc); | |
855 | return fid; | |
856 | ||
857 | clunk_fid: | |
858 | kfree(tc); | |
859 | kfree(rc); | |
860 | rc = NULL; | |
861 | tc = p9_create_tclunk(fid->fid); | |
862 | if (IS_ERR(tc)) { | |
863 | err = PTR_ERR(tc); | |
864 | tc = NULL; | |
865 | goto error; | |
866 | } | |
867 | ||
e2735b77 | 868 | p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
869 | |
870 | error: | |
871 | kfree(tc); | |
872 | kfree(rc); | |
873 | if (fid && (fid != oldfid)) | |
874 | p9_fid_destroy(fid); | |
875 | ||
876 | return ERR_PTR(err); | |
877 | } | |
878 | EXPORT_SYMBOL(p9_client_walk); | |
879 | ||
880 | int p9_client_open(struct p9_fid *fid, int mode) | |
881 | { | |
882 | int err; | |
883 | struct p9_fcall *tc, *rc; | |
884 | struct p9_client *clnt; | |
885 | ||
886 | P9_DPRINTK(P9_DEBUG_9P, "fid %d mode %d\n", fid->fid, mode); | |
887 | err = 0; | |
888 | tc = NULL; | |
889 | rc = NULL; | |
890 | clnt = fid->clnt; | |
891 | ||
892 | if (fid->mode != -1) | |
893 | return -EINVAL; | |
894 | ||
895 | tc = p9_create_topen(fid->fid, mode); | |
896 | if (IS_ERR(tc)) { | |
897 | err = PTR_ERR(tc); | |
898 | tc = NULL; | |
899 | goto done; | |
900 | } | |
901 | ||
e2735b77 | 902 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
903 | if (err) |
904 | goto done; | |
905 | ||
906 | fid->mode = mode; | |
907 | fid->iounit = rc->params.ropen.iounit; | |
908 | ||
909 | done: | |
910 | kfree(tc); | |
911 | kfree(rc); | |
912 | return err; | |
913 | } | |
914 | EXPORT_SYMBOL(p9_client_open); | |
915 | ||
916 | int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode, | |
917 | char *extension) | |
918 | { | |
919 | int err; | |
920 | struct p9_fcall *tc, *rc; | |
921 | struct p9_client *clnt; | |
922 | ||
923 | P9_DPRINTK(P9_DEBUG_9P, "fid %d name %s perm %d mode %d\n", fid->fid, | |
924 | name, perm, mode); | |
925 | err = 0; | |
926 | tc = NULL; | |
927 | rc = NULL; | |
928 | clnt = fid->clnt; | |
929 | ||
930 | if (fid->mode != -1) | |
931 | return -EINVAL; | |
932 | ||
933 | tc = p9_create_tcreate(fid->fid, name, perm, mode, extension, | |
934 | clnt->dotu); | |
935 | if (IS_ERR(tc)) { | |
936 | err = PTR_ERR(tc); | |
937 | tc = NULL; | |
938 | goto done; | |
939 | } | |
940 | ||
e2735b77 | 941 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
942 | if (err) |
943 | goto done; | |
944 | ||
945 | fid->mode = mode; | |
946 | fid->iounit = rc->params.ropen.iounit; | |
947 | ||
948 | done: | |
949 | kfree(tc); | |
950 | kfree(rc); | |
951 | return err; | |
952 | } | |
953 | EXPORT_SYMBOL(p9_client_fcreate); | |
954 | ||
955 | int p9_client_clunk(struct p9_fid *fid) | |
956 | { | |
957 | int err; | |
958 | struct p9_fcall *tc, *rc; | |
959 | struct p9_client *clnt; | |
960 | ||
961 | P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid); | |
962 | err = 0; | |
963 | tc = NULL; | |
964 | rc = NULL; | |
965 | clnt = fid->clnt; | |
966 | ||
967 | tc = p9_create_tclunk(fid->fid); | |
968 | if (IS_ERR(tc)) { | |
969 | err = PTR_ERR(tc); | |
970 | tc = NULL; | |
971 | goto done; | |
972 | } | |
973 | ||
e2735b77 | 974 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
975 | if (err) |
976 | goto done; | |
977 | ||
978 | p9_fid_destroy(fid); | |
979 | ||
980 | done: | |
981 | kfree(tc); | |
982 | kfree(rc); | |
983 | return err; | |
984 | } | |
985 | EXPORT_SYMBOL(p9_client_clunk); | |
986 | ||
987 | int p9_client_remove(struct p9_fid *fid) | |
988 | { | |
989 | int err; | |
990 | struct p9_fcall *tc, *rc; | |
991 | struct p9_client *clnt; | |
992 | ||
993 | P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid); | |
994 | err = 0; | |
995 | tc = NULL; | |
996 | rc = NULL; | |
997 | clnt = fid->clnt; | |
998 | ||
999 | tc = p9_create_tremove(fid->fid); | |
1000 | if (IS_ERR(tc)) { | |
1001 | err = PTR_ERR(tc); | |
1002 | tc = NULL; | |
1003 | goto done; | |
1004 | } | |
1005 | ||
e2735b77 | 1006 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
1007 | if (err) |
1008 | goto done; | |
1009 | ||
1010 | p9_fid_destroy(fid); | |
1011 | ||
1012 | done: | |
1013 | kfree(tc); | |
1014 | kfree(rc); | |
1015 | return err; | |
1016 | } | |
1017 | EXPORT_SYMBOL(p9_client_remove); | |
1018 | ||
1019 | int p9_client_read(struct p9_fid *fid, char *data, u64 offset, u32 count) | |
1020 | { | |
1021 | int err, n, rsize, total; | |
1022 | struct p9_fcall *tc, *rc; | |
1023 | struct p9_client *clnt; | |
1024 | ||
1025 | P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu %d\n", fid->fid, | |
1026 | (long long unsigned) offset, count); | |
1027 | err = 0; | |
1028 | tc = NULL; | |
1029 | rc = NULL; | |
1030 | clnt = fid->clnt; | |
1031 | total = 0; | |
1032 | ||
1033 | rsize = fid->iounit; | |
1034 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) | |
1035 | rsize = clnt->msize - P9_IOHDRSZ; | |
1036 | ||
1037 | do { | |
1038 | if (count < rsize) | |
1039 | rsize = count; | |
1040 | ||
1041 | tc = p9_create_tread(fid->fid, offset, rsize); | |
1042 | if (IS_ERR(tc)) { | |
1043 | err = PTR_ERR(tc); | |
1044 | tc = NULL; | |
1045 | goto error; | |
1046 | } | |
1047 | ||
e2735b77 | 1048 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
1049 | if (err) |
1050 | goto error; | |
1051 | ||
1052 | n = rc->params.rread.count; | |
1053 | if (n > count) | |
1054 | n = count; | |
1055 | ||
1056 | memmove(data, rc->params.rread.data, n); | |
1057 | count -= n; | |
1058 | data += n; | |
1059 | offset += n; | |
1060 | total += n; | |
1061 | kfree(tc); | |
1062 | tc = NULL; | |
1063 | kfree(rc); | |
1064 | rc = NULL; | |
1065 | } while (count > 0 && n == rsize); | |
1066 | ||
1067 | return total; | |
1068 | ||
1069 | error: | |
1070 | kfree(tc); | |
1071 | kfree(rc); | |
1072 | return err; | |
1073 | } | |
1074 | EXPORT_SYMBOL(p9_client_read); | |
1075 | ||
1076 | int p9_client_write(struct p9_fid *fid, char *data, u64 offset, u32 count) | |
1077 | { | |
1078 | int err, n, rsize, total; | |
1079 | struct p9_fcall *tc, *rc; | |
1080 | struct p9_client *clnt; | |
1081 | ||
1082 | P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid, | |
1083 | (long long unsigned) offset, count); | |
1084 | err = 0; | |
1085 | tc = NULL; | |
1086 | rc = NULL; | |
1087 | clnt = fid->clnt; | |
1088 | total = 0; | |
1089 | ||
1090 | rsize = fid->iounit; | |
1091 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) | |
1092 | rsize = clnt->msize - P9_IOHDRSZ; | |
1093 | ||
1094 | do { | |
1095 | if (count < rsize) | |
1096 | rsize = count; | |
1097 | ||
1098 | tc = p9_create_twrite(fid->fid, offset, rsize, data); | |
1099 | if (IS_ERR(tc)) { | |
1100 | err = PTR_ERR(tc); | |
1101 | tc = NULL; | |
1102 | goto error; | |
1103 | } | |
1104 | ||
e2735b77 | 1105 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
1106 | if (err) |
1107 | goto error; | |
1108 | ||
1109 | n = rc->params.rread.count; | |
1110 | count -= n; | |
1111 | data += n; | |
1112 | offset += n; | |
1113 | total += n; | |
1114 | kfree(tc); | |
1115 | tc = NULL; | |
1116 | kfree(rc); | |
1117 | rc = NULL; | |
1118 | } while (count > 0); | |
1119 | ||
1120 | return total; | |
1121 | ||
1122 | error: | |
1123 | kfree(tc); | |
1124 | kfree(rc); | |
1125 | return err; | |
1126 | } | |
1127 | EXPORT_SYMBOL(p9_client_write); | |
1128 | ||
1129 | int | |
1130 | p9_client_uread(struct p9_fid *fid, char __user *data, u64 offset, u32 count) | |
1131 | { | |
1132 | int err, n, rsize, total; | |
1133 | struct p9_fcall *tc, *rc; | |
1134 | struct p9_client *clnt; | |
1135 | ||
1136 | P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid, | |
1137 | (long long unsigned) offset, count); | |
1138 | err = 0; | |
1139 | tc = NULL; | |
1140 | rc = NULL; | |
1141 | clnt = fid->clnt; | |
1142 | total = 0; | |
1143 | ||
1144 | rsize = fid->iounit; | |
1145 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) | |
1146 | rsize = clnt->msize - P9_IOHDRSZ; | |
1147 | ||
1148 | do { | |
1149 | if (count < rsize) | |
1150 | rsize = count; | |
1151 | ||
1152 | tc = p9_create_tread(fid->fid, offset, rsize); | |
1153 | if (IS_ERR(tc)) { | |
1154 | err = PTR_ERR(tc); | |
1155 | tc = NULL; | |
1156 | goto error; | |
1157 | } | |
1158 | ||
e2735b77 | 1159 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
1160 | if (err) |
1161 | goto error; | |
1162 | ||
1163 | n = rc->params.rread.count; | |
1164 | if (n > count) | |
1165 | n = count; | |
1166 | ||
1167 | err = copy_to_user(data, rc->params.rread.data, n); | |
1168 | if (err) { | |
1169 | err = -EFAULT; | |
1170 | goto error; | |
1171 | } | |
1172 | ||
1173 | count -= n; | |
1174 | data += n; | |
1175 | offset += n; | |
1176 | total += n; | |
1177 | kfree(tc); | |
1178 | tc = NULL; | |
1179 | kfree(rc); | |
1180 | rc = NULL; | |
1181 | } while (count > 0 && n == rsize); | |
1182 | ||
1183 | return total; | |
1184 | ||
1185 | error: | |
1186 | kfree(tc); | |
1187 | kfree(rc); | |
1188 | return err; | |
1189 | } | |
1190 | EXPORT_SYMBOL(p9_client_uread); | |
1191 | ||
1192 | int | |
1193 | p9_client_uwrite(struct p9_fid *fid, const char __user *data, u64 offset, | |
1194 | u32 count) | |
1195 | { | |
1196 | int err, n, rsize, total; | |
1197 | struct p9_fcall *tc, *rc; | |
1198 | struct p9_client *clnt; | |
1199 | ||
1200 | P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid, | |
1201 | (long long unsigned) offset, count); | |
1202 | err = 0; | |
1203 | tc = NULL; | |
1204 | rc = NULL; | |
1205 | clnt = fid->clnt; | |
1206 | total = 0; | |
1207 | ||
1208 | rsize = fid->iounit; | |
1209 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) | |
1210 | rsize = clnt->msize - P9_IOHDRSZ; | |
1211 | ||
1212 | do { | |
1213 | if (count < rsize) | |
1214 | rsize = count; | |
1215 | ||
1216 | tc = p9_create_twrite_u(fid->fid, offset, rsize, data); | |
1217 | if (IS_ERR(tc)) { | |
1218 | err = PTR_ERR(tc); | |
1219 | tc = NULL; | |
1220 | goto error; | |
1221 | } | |
1222 | ||
e2735b77 | 1223 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
1224 | if (err) |
1225 | goto error; | |
1226 | ||
1227 | n = rc->params.rread.count; | |
1228 | count -= n; | |
1229 | data += n; | |
1230 | offset += n; | |
1231 | total += n; | |
1232 | kfree(tc); | |
1233 | tc = NULL; | |
1234 | kfree(rc); | |
1235 | rc = NULL; | |
1236 | } while (count > 0); | |
1237 | ||
1238 | return total; | |
1239 | ||
1240 | error: | |
1241 | kfree(tc); | |
1242 | kfree(rc); | |
1243 | return err; | |
1244 | } | |
1245 | EXPORT_SYMBOL(p9_client_uwrite); | |
1246 | ||
1247 | int p9_client_readn(struct p9_fid *fid, char *data, u64 offset, u32 count) | |
1248 | { | |
1249 | int n, total; | |
1250 | ||
1251 | P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid, | |
1252 | (long long unsigned) offset, count); | |
1253 | n = 0; | |
1254 | total = 0; | |
1255 | while (count) { | |
1256 | n = p9_client_read(fid, data, offset, count); | |
1257 | if (n <= 0) | |
1258 | break; | |
1259 | ||
1260 | data += n; | |
1261 | offset += n; | |
1262 | count -= n; | |
1263 | total += n; | |
1264 | } | |
1265 | ||
1266 | if (n < 0) | |
1267 | total = n; | |
1268 | ||
1269 | return total; | |
1270 | } | |
1271 | EXPORT_SYMBOL(p9_client_readn); | |
1272 | ||
5503ac56 EVH |
1273 | static struct p9_stat *p9_clone_stat(struct p9_stat *st, int dotu) |
1274 | { | |
1275 | int n; | |
1276 | char *p; | |
1277 | struct p9_stat *ret; | |
1278 | ||
1279 | n = sizeof(struct p9_stat) + st->name.len + st->uid.len + st->gid.len + | |
1280 | st->muid.len; | |
1281 | ||
1282 | if (dotu) | |
1283 | n += st->extension.len; | |
1284 | ||
1285 | ret = kmalloc(n, GFP_KERNEL); | |
1286 | if (!ret) | |
1287 | return ERR_PTR(-ENOMEM); | |
1288 | ||
1289 | memmove(ret, st, sizeof(struct p9_stat)); | |
1290 | p = ((char *) ret) + sizeof(struct p9_stat); | |
1291 | memmove(p, st->name.str, st->name.len); | |
1292 | ret->name.str = p; | |
1293 | p += st->name.len; | |
1294 | memmove(p, st->uid.str, st->uid.len); | |
1295 | ret->uid.str = p; | |
1296 | p += st->uid.len; | |
1297 | memmove(p, st->gid.str, st->gid.len); | |
1298 | ret->gid.str = p; | |
1299 | p += st->gid.len; | |
1300 | memmove(p, st->muid.str, st->muid.len); | |
1301 | ret->muid.str = p; | |
1302 | p += st->muid.len; | |
1303 | ||
1304 | if (dotu) { | |
1305 | memmove(p, st->extension.str, st->extension.len); | |
1306 | ret->extension.str = p; | |
1307 | p += st->extension.len; | |
1308 | } | |
1309 | ||
1310 | return ret; | |
1311 | } | |
1312 | ||
bd238fb4 LI |
1313 | struct p9_stat *p9_client_stat(struct p9_fid *fid) |
1314 | { | |
1315 | int err; | |
1316 | struct p9_fcall *tc, *rc; | |
1317 | struct p9_client *clnt; | |
1318 | struct p9_stat *ret; | |
1319 | ||
1320 | P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid); | |
1321 | err = 0; | |
1322 | tc = NULL; | |
1323 | rc = NULL; | |
1324 | ret = NULL; | |
1325 | clnt = fid->clnt; | |
1326 | ||
1327 | tc = p9_create_tstat(fid->fid); | |
1328 | if (IS_ERR(tc)) { | |
1329 | err = PTR_ERR(tc); | |
1330 | tc = NULL; | |
1331 | goto error; | |
1332 | } | |
1333 | ||
e2735b77 | 1334 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
1335 | if (err) |
1336 | goto error; | |
1337 | ||
1338 | ret = p9_clone_stat(&rc->params.rstat.stat, clnt->dotu); | |
1339 | if (IS_ERR(ret)) { | |
1340 | err = PTR_ERR(ret); | |
1341 | ret = NULL; | |
1342 | goto error; | |
1343 | } | |
1344 | ||
1345 | kfree(tc); | |
1346 | kfree(rc); | |
1347 | return ret; | |
1348 | ||
1349 | error: | |
1350 | kfree(tc); | |
1351 | kfree(rc); | |
1352 | kfree(ret); | |
1353 | return ERR_PTR(err); | |
1354 | } | |
1355 | EXPORT_SYMBOL(p9_client_stat); | |
1356 | ||
1357 | int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) | |
1358 | { | |
1359 | int err; | |
1360 | struct p9_fcall *tc, *rc; | |
1361 | struct p9_client *clnt; | |
1362 | ||
1363 | P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid); | |
1364 | err = 0; | |
1365 | tc = NULL; | |
1366 | rc = NULL; | |
1367 | clnt = fid->clnt; | |
1368 | ||
1369 | tc = p9_create_twstat(fid->fid, wst, clnt->dotu); | |
1370 | if (IS_ERR(tc)) { | |
1371 | err = PTR_ERR(tc); | |
1372 | tc = NULL; | |
1373 | goto done; | |
1374 | } | |
1375 | ||
e2735b77 | 1376 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
1377 | |
1378 | done: | |
1379 | kfree(tc); | |
1380 | kfree(rc); | |
1381 | return err; | |
1382 | } | |
1383 | EXPORT_SYMBOL(p9_client_wstat); | |
1384 | ||
1385 | struct p9_stat *p9_client_dirread(struct p9_fid *fid, u64 offset) | |
1386 | { | |
1387 | int err, n, m; | |
1388 | struct p9_fcall *tc, *rc; | |
1389 | struct p9_client *clnt; | |
1390 | struct p9_stat st, *ret; | |
1391 | ||
1392 | P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu\n", fid->fid, | |
1393 | (long long unsigned) offset); | |
1394 | err = 0; | |
1395 | tc = NULL; | |
1396 | rc = NULL; | |
1397 | ret = NULL; | |
1398 | clnt = fid->clnt; | |
1399 | ||
1400 | /* if the offset is below or above the current response, free it */ | |
1401 | if (offset < fid->rdir_fpos || (fid->rdir_fcall && | |
1402 | offset >= fid->rdir_fpos+fid->rdir_fcall->params.rread.count)) { | |
1403 | fid->rdir_pos = 0; | |
1404 | if (fid->rdir_fcall) | |
1405 | fid->rdir_fpos += fid->rdir_fcall->params.rread.count; | |
1406 | ||
1407 | kfree(fid->rdir_fcall); | |
1408 | fid->rdir_fcall = NULL; | |
1409 | if (offset < fid->rdir_fpos) | |
1410 | fid->rdir_fpos = 0; | |
1411 | } | |
1412 | ||
1413 | if (!fid->rdir_fcall) { | |
1414 | n = fid->iounit; | |
1415 | if (!n || n > clnt->msize-P9_IOHDRSZ) | |
1416 | n = clnt->msize - P9_IOHDRSZ; | |
1417 | ||
1418 | while (1) { | |
1419 | if (fid->rdir_fcall) { | |
1420 | fid->rdir_fpos += | |
1421 | fid->rdir_fcall->params.rread.count; | |
1422 | kfree(fid->rdir_fcall); | |
1423 | fid->rdir_fcall = NULL; | |
1424 | } | |
1425 | ||
1426 | tc = p9_create_tread(fid->fid, fid->rdir_fpos, n); | |
1427 | if (IS_ERR(tc)) { | |
1428 | err = PTR_ERR(tc); | |
1429 | tc = NULL; | |
1430 | goto error; | |
1431 | } | |
1432 | ||
e2735b77 | 1433 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
1434 | if (err) |
1435 | goto error; | |
1436 | ||
1437 | n = rc->params.rread.count; | |
1438 | if (n == 0) | |
1439 | goto done; | |
1440 | ||
1441 | fid->rdir_fcall = rc; | |
1442 | rc = NULL; | |
1443 | if (offset >= fid->rdir_fpos && | |
1444 | offset < fid->rdir_fpos+n) | |
1445 | break; | |
1446 | } | |
1447 | ||
1448 | fid->rdir_pos = 0; | |
1449 | } | |
1450 | ||
1451 | m = offset - fid->rdir_fpos; | |
1452 | if (m < 0) | |
1453 | goto done; | |
1454 | ||
1455 | n = p9_deserialize_stat(fid->rdir_fcall->params.rread.data + m, | |
1456 | fid->rdir_fcall->params.rread.count - m, &st, clnt->dotu); | |
1457 | ||
1458 | if (!n) { | |
1459 | err = -EIO; | |
1460 | goto error; | |
1461 | } | |
1462 | ||
1463 | fid->rdir_pos += n; | |
1464 | st.size = n; | |
1465 | ret = p9_clone_stat(&st, clnt->dotu); | |
1466 | if (IS_ERR(ret)) { | |
1467 | err = PTR_ERR(ret); | |
1468 | ret = NULL; | |
1469 | goto error; | |
1470 | } | |
1471 | ||
1472 | done: | |
1473 | kfree(tc); | |
1474 | kfree(rc); | |
1475 | return ret; | |
1476 | ||
1477 | error: | |
1478 | kfree(tc); | |
1479 | kfree(rc); | |
1480 | kfree(ret); | |
1481 | return ERR_PTR(err); | |
1482 | } | |
1483 | EXPORT_SYMBOL(p9_client_dirread); |