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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/transport.h> |
bd238fb4 LI |
37 | #include <net/9p/client.h> |
38 | ||
39 | static struct p9_fid *p9_fid_create(struct p9_client *clnt); | |
40 | static void p9_fid_destroy(struct p9_fid *fid); | |
41 | static struct p9_stat *p9_clone_stat(struct p9_stat *st, int dotu); | |
42 | ||
8a0dc95f EVH |
43 | /* |
44 | * Client Option Parsing (code inspired by NFS code) | |
45 | * - a little lazy - parse all client options | |
46 | */ | |
47 | ||
48 | enum { | |
49 | Opt_msize, | |
50 | Opt_trans, | |
51 | Opt_legacy, | |
52 | Opt_err, | |
53 | }; | |
54 | ||
55 | static match_table_t tokens = { | |
56 | {Opt_msize, "msize=%u"}, | |
57 | {Opt_legacy, "noextend"}, | |
58 | {Opt_trans, "trans=%s"}, | |
59 | {Opt_err, NULL}, | |
60 | }; | |
61 | ||
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 EVH |
77 | |
78 | clnt->trans_mod = v9fs_default_trans(); | |
79 | clnt->dotu = 1; | |
80 | clnt->msize = 8192; | |
81 | ||
bb8ffdfc EVH |
82 | if (!opts) |
83 | return 0; | |
84 | ||
85 | options = kstrdup(opts, GFP_KERNEL); | |
86 | if (!options) { | |
87 | P9_DPRINTK(P9_DEBUG_ERROR, | |
88 | "failed to allocate copy of option string\n"); | |
89 | return -ENOMEM; | |
90 | } | |
8a0dc95f EVH |
91 | |
92 | while ((p = strsep(&options, ",")) != NULL) { | |
93 | int token; | |
94 | if (!*p) | |
95 | continue; | |
96 | token = match_token(p, tokens, args); | |
97 | if (token < Opt_trans) { | |
bb8ffdfc EVH |
98 | int r = match_int(&args[0], &option); |
99 | if (r < 0) { | |
8a0dc95f EVH |
100 | P9_DPRINTK(P9_DEBUG_ERROR, |
101 | "integer field, but no integer?\n"); | |
bb8ffdfc | 102 | ret = r; |
8a0dc95f EVH |
103 | continue; |
104 | } | |
105 | } | |
106 | switch (token) { | |
107 | case Opt_msize: | |
108 | clnt->msize = option; | |
109 | break; | |
110 | case Opt_trans: | |
111 | clnt->trans_mod = v9fs_match_trans(&args[0]); | |
112 | break; | |
113 | case Opt_legacy: | |
114 | clnt->dotu = 0; | |
115 | break; | |
116 | default: | |
117 | continue; | |
118 | } | |
119 | } | |
bb8ffdfc EVH |
120 | kfree(options); |
121 | return ret; | |
8a0dc95f EVH |
122 | } |
123 | ||
124 | ||
043aba40 EVH |
125 | /** |
126 | * p9_client_rpc - sends 9P request and waits until a response is available. | |
127 | * The function can be interrupted. | |
128 | * @c: client data | |
129 | * @tc: request to be sent | |
130 | * @rc: pointer where a pointer to the response is stored | |
131 | */ | |
132 | int | |
133 | p9_client_rpc(struct p9_client *c, struct p9_fcall *tc, | |
134 | struct p9_fcall **rc) | |
135 | { | |
8a0dc95f | 136 | return c->trans->rpc(c->trans, tc, rc); |
043aba40 EVH |
137 | } |
138 | ||
8a0dc95f | 139 | struct p9_client *p9_client_create(const char *dev_name, char *options) |
bd238fb4 LI |
140 | { |
141 | int err, n; | |
142 | struct p9_client *clnt; | |
143 | struct p9_fcall *tc, *rc; | |
144 | struct p9_str *version; | |
145 | ||
146 | err = 0; | |
147 | tc = NULL; | |
148 | rc = NULL; | |
149 | clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); | |
150 | if (!clnt) | |
151 | return ERR_PTR(-ENOMEM); | |
152 | ||
bb8ffdfc | 153 | clnt->trans = NULL; |
bd238fb4 | 154 | spin_lock_init(&clnt->lock); |
bd238fb4 LI |
155 | INIT_LIST_HEAD(&clnt->fidlist); |
156 | clnt->fidpool = p9_idpool_create(); | |
728fc4ef | 157 | if (IS_ERR(clnt->fidpool)) { |
bd238fb4 LI |
158 | err = PTR_ERR(clnt->fidpool); |
159 | clnt->fidpool = NULL; | |
160 | goto error; | |
161 | } | |
162 | ||
bb8ffdfc EVH |
163 | err = parse_opts(options, clnt); |
164 | if (err < 0) | |
165 | goto error; | |
166 | ||
8a0dc95f EVH |
167 | if (clnt->trans_mod == NULL) { |
168 | err = -EPROTONOSUPPORT; | |
169 | P9_DPRINTK(P9_DEBUG_ERROR, | |
170 | "No transport defined or default transport\n"); | |
171 | goto error; | |
172 | } | |
173 | ||
174 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p trans %p msize %d dotu %d\n", | |
175 | clnt, clnt->trans_mod, clnt->msize, clnt->dotu); | |
176 | ||
177 | ||
178 | clnt->trans = clnt->trans_mod->create(dev_name, options, clnt->msize, | |
179 | clnt->dotu); | |
180 | if (IS_ERR(clnt->trans)) { | |
181 | err = PTR_ERR(clnt->trans); | |
182 | clnt->trans = NULL; | |
bd238fb4 LI |
183 | goto error; |
184 | } | |
185 | ||
8a0dc95f EVH |
186 | if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize) |
187 | clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ; | |
188 | ||
bd238fb4 LI |
189 | tc = p9_create_tversion(clnt->msize, clnt->dotu?"9P2000.u":"9P2000"); |
190 | if (IS_ERR(tc)) { | |
191 | err = PTR_ERR(tc); | |
192 | tc = NULL; | |
193 | goto error; | |
194 | } | |
195 | ||
e2735b77 | 196 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
197 | if (err) |
198 | goto error; | |
199 | ||
200 | version = &rc->params.rversion.version; | |
201 | if (version->len == 8 && !memcmp(version->str, "9P2000.u", 8)) | |
202 | clnt->dotu = 1; | |
203 | else if (version->len == 6 && !memcmp(version->str, "9P2000", 6)) | |
204 | clnt->dotu = 0; | |
205 | else { | |
206 | err = -EREMOTEIO; | |
207 | goto error; | |
208 | } | |
209 | ||
210 | n = rc->params.rversion.msize; | |
211 | if (n < clnt->msize) | |
212 | clnt->msize = n; | |
213 | ||
214 | kfree(tc); | |
215 | kfree(rc); | |
216 | return clnt; | |
217 | ||
218 | error: | |
219 | kfree(tc); | |
220 | kfree(rc); | |
221 | p9_client_destroy(clnt); | |
222 | return ERR_PTR(err); | |
223 | } | |
224 | EXPORT_SYMBOL(p9_client_create); | |
225 | ||
226 | void p9_client_destroy(struct p9_client *clnt) | |
227 | { | |
228 | struct p9_fid *fid, *fidptr; | |
229 | ||
230 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); | |
bd238fb4 LI |
231 | |
232 | if (clnt->trans) { | |
233 | clnt->trans->close(clnt->trans); | |
234 | kfree(clnt->trans); | |
235 | clnt->trans = NULL; | |
236 | } | |
237 | ||
bd238fb4 LI |
238 | list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) |
239 | p9_fid_destroy(fid); | |
240 | ||
0af8887e EVH |
241 | if (clnt->fidpool) |
242 | p9_idpool_destroy(clnt->fidpool); | |
243 | ||
bd238fb4 LI |
244 | kfree(clnt); |
245 | } | |
246 | EXPORT_SYMBOL(p9_client_destroy); | |
247 | ||
248 | void p9_client_disconnect(struct p9_client *clnt) | |
249 | { | |
250 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); | |
251 | clnt->trans->status = Disconnected; | |
bd238fb4 LI |
252 | } |
253 | EXPORT_SYMBOL(p9_client_disconnect); | |
254 | ||
255 | struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, | |
ba17674f | 256 | char *uname, u32 n_uname, char *aname) |
bd238fb4 LI |
257 | { |
258 | int err; | |
259 | struct p9_fcall *tc, *rc; | |
260 | struct p9_fid *fid; | |
261 | ||
262 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p afid %d uname %s aname %s\n", | |
263 | clnt, afid?afid->fid:-1, uname, aname); | |
264 | err = 0; | |
265 | tc = NULL; | |
266 | rc = NULL; | |
267 | ||
268 | fid = p9_fid_create(clnt); | |
269 | if (IS_ERR(fid)) { | |
270 | err = PTR_ERR(fid); | |
271 | fid = NULL; | |
272 | goto error; | |
273 | } | |
274 | ||
ba17674f LI |
275 | tc = p9_create_tattach(fid->fid, afid?afid->fid:P9_NOFID, uname, aname, |
276 | n_uname, clnt->dotu); | |
bd238fb4 LI |
277 | if (IS_ERR(tc)) { |
278 | err = PTR_ERR(tc); | |
279 | tc = NULL; | |
280 | goto error; | |
281 | } | |
282 | ||
e2735b77 | 283 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
284 | if (err) |
285 | goto error; | |
286 | ||
287 | memmove(&fid->qid, &rc->params.rattach.qid, sizeof(struct p9_qid)); | |
288 | kfree(tc); | |
289 | kfree(rc); | |
290 | return fid; | |
291 | ||
292 | error: | |
293 | kfree(tc); | |
294 | kfree(rc); | |
295 | if (fid) | |
296 | p9_fid_destroy(fid); | |
297 | return ERR_PTR(err); | |
298 | } | |
299 | EXPORT_SYMBOL(p9_client_attach); | |
300 | ||
ba17674f LI |
301 | struct p9_fid *p9_client_auth(struct p9_client *clnt, char *uname, |
302 | u32 n_uname, char *aname) | |
bd238fb4 LI |
303 | { |
304 | int err; | |
305 | struct p9_fcall *tc, *rc; | |
306 | struct p9_fid *fid; | |
307 | ||
308 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p uname %s aname %s\n", clnt, uname, | |
309 | aname); | |
310 | err = 0; | |
311 | tc = NULL; | |
312 | rc = NULL; | |
313 | ||
314 | fid = p9_fid_create(clnt); | |
315 | if (IS_ERR(fid)) { | |
316 | err = PTR_ERR(fid); | |
317 | fid = NULL; | |
318 | goto error; | |
319 | } | |
320 | ||
ba17674f | 321 | tc = p9_create_tauth(fid->fid, uname, aname, n_uname, clnt->dotu); |
bd238fb4 LI |
322 | if (IS_ERR(tc)) { |
323 | err = PTR_ERR(tc); | |
324 | tc = NULL; | |
325 | goto error; | |
326 | } | |
327 | ||
e2735b77 | 328 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
329 | if (err) |
330 | goto error; | |
331 | ||
332 | memmove(&fid->qid, &rc->params.rauth.qid, sizeof(struct p9_qid)); | |
333 | kfree(tc); | |
334 | kfree(rc); | |
335 | return fid; | |
336 | ||
337 | error: | |
338 | kfree(tc); | |
339 | kfree(rc); | |
340 | if (fid) | |
341 | p9_fid_destroy(fid); | |
342 | return ERR_PTR(err); | |
343 | } | |
344 | EXPORT_SYMBOL(p9_client_auth); | |
345 | ||
346 | struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames, | |
347 | int clone) | |
348 | { | |
349 | int err; | |
350 | struct p9_fcall *tc, *rc; | |
351 | struct p9_client *clnt; | |
352 | struct p9_fid *fid; | |
353 | ||
354 | P9_DPRINTK(P9_DEBUG_9P, "fid %d nwname %d wname[0] %s\n", | |
355 | oldfid->fid, nwname, wnames?wnames[0]:NULL); | |
356 | err = 0; | |
357 | tc = NULL; | |
358 | rc = NULL; | |
359 | clnt = oldfid->clnt; | |
360 | if (clone) { | |
361 | fid = p9_fid_create(clnt); | |
362 | if (IS_ERR(fid)) { | |
363 | err = PTR_ERR(fid); | |
364 | fid = NULL; | |
365 | goto error; | |
366 | } | |
367 | ||
368 | fid->uid = oldfid->uid; | |
369 | } else | |
370 | fid = oldfid; | |
371 | ||
372 | tc = p9_create_twalk(oldfid->fid, fid->fid, nwname, wnames); | |
373 | if (IS_ERR(tc)) { | |
374 | err = PTR_ERR(tc); | |
375 | tc = NULL; | |
376 | goto error; | |
377 | } | |
378 | ||
e2735b77 | 379 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
380 | if (err) { |
381 | if (rc && rc->id == P9_RWALK) | |
382 | goto clunk_fid; | |
383 | else | |
384 | goto error; | |
385 | } | |
386 | ||
387 | if (rc->params.rwalk.nwqid != nwname) { | |
388 | err = -ENOENT; | |
389 | goto clunk_fid; | |
390 | } | |
391 | ||
392 | if (nwname) | |
393 | memmove(&fid->qid, | |
394 | &rc->params.rwalk.wqids[rc->params.rwalk.nwqid - 1], | |
395 | sizeof(struct p9_qid)); | |
396 | else | |
397 | fid->qid = oldfid->qid; | |
398 | ||
399 | kfree(tc); | |
400 | kfree(rc); | |
401 | return fid; | |
402 | ||
403 | clunk_fid: | |
404 | kfree(tc); | |
405 | kfree(rc); | |
406 | rc = NULL; | |
407 | tc = p9_create_tclunk(fid->fid); | |
408 | if (IS_ERR(tc)) { | |
409 | err = PTR_ERR(tc); | |
410 | tc = NULL; | |
411 | goto error; | |
412 | } | |
413 | ||
e2735b77 | 414 | p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
415 | |
416 | error: | |
417 | kfree(tc); | |
418 | kfree(rc); | |
419 | if (fid && (fid != oldfid)) | |
420 | p9_fid_destroy(fid); | |
421 | ||
422 | return ERR_PTR(err); | |
423 | } | |
424 | EXPORT_SYMBOL(p9_client_walk); | |
425 | ||
426 | int p9_client_open(struct p9_fid *fid, int mode) | |
427 | { | |
428 | int err; | |
429 | struct p9_fcall *tc, *rc; | |
430 | struct p9_client *clnt; | |
431 | ||
432 | P9_DPRINTK(P9_DEBUG_9P, "fid %d mode %d\n", fid->fid, mode); | |
433 | err = 0; | |
434 | tc = NULL; | |
435 | rc = NULL; | |
436 | clnt = fid->clnt; | |
437 | ||
438 | if (fid->mode != -1) | |
439 | return -EINVAL; | |
440 | ||
441 | tc = p9_create_topen(fid->fid, mode); | |
442 | if (IS_ERR(tc)) { | |
443 | err = PTR_ERR(tc); | |
444 | tc = NULL; | |
445 | goto done; | |
446 | } | |
447 | ||
e2735b77 | 448 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
449 | if (err) |
450 | goto done; | |
451 | ||
452 | fid->mode = mode; | |
453 | fid->iounit = rc->params.ropen.iounit; | |
454 | ||
455 | done: | |
456 | kfree(tc); | |
457 | kfree(rc); | |
458 | return err; | |
459 | } | |
460 | EXPORT_SYMBOL(p9_client_open); | |
461 | ||
462 | int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode, | |
463 | char *extension) | |
464 | { | |
465 | int err; | |
466 | struct p9_fcall *tc, *rc; | |
467 | struct p9_client *clnt; | |
468 | ||
469 | P9_DPRINTK(P9_DEBUG_9P, "fid %d name %s perm %d mode %d\n", fid->fid, | |
470 | name, perm, mode); | |
471 | err = 0; | |
472 | tc = NULL; | |
473 | rc = NULL; | |
474 | clnt = fid->clnt; | |
475 | ||
476 | if (fid->mode != -1) | |
477 | return -EINVAL; | |
478 | ||
479 | tc = p9_create_tcreate(fid->fid, name, perm, mode, extension, | |
480 | clnt->dotu); | |
481 | if (IS_ERR(tc)) { | |
482 | err = PTR_ERR(tc); | |
483 | tc = NULL; | |
484 | goto done; | |
485 | } | |
486 | ||
e2735b77 | 487 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
488 | if (err) |
489 | goto done; | |
490 | ||
491 | fid->mode = mode; | |
492 | fid->iounit = rc->params.ropen.iounit; | |
493 | ||
494 | done: | |
495 | kfree(tc); | |
496 | kfree(rc); | |
497 | return err; | |
498 | } | |
499 | EXPORT_SYMBOL(p9_client_fcreate); | |
500 | ||
501 | int p9_client_clunk(struct p9_fid *fid) | |
502 | { | |
503 | int err; | |
504 | struct p9_fcall *tc, *rc; | |
505 | struct p9_client *clnt; | |
506 | ||
507 | P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid); | |
508 | err = 0; | |
509 | tc = NULL; | |
510 | rc = NULL; | |
511 | clnt = fid->clnt; | |
512 | ||
513 | tc = p9_create_tclunk(fid->fid); | |
514 | if (IS_ERR(tc)) { | |
515 | err = PTR_ERR(tc); | |
516 | tc = NULL; | |
517 | goto done; | |
518 | } | |
519 | ||
e2735b77 | 520 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
521 | if (err) |
522 | goto done; | |
523 | ||
524 | p9_fid_destroy(fid); | |
525 | ||
526 | done: | |
527 | kfree(tc); | |
528 | kfree(rc); | |
529 | return err; | |
530 | } | |
531 | EXPORT_SYMBOL(p9_client_clunk); | |
532 | ||
533 | int p9_client_remove(struct p9_fid *fid) | |
534 | { | |
535 | int err; | |
536 | struct p9_fcall *tc, *rc; | |
537 | struct p9_client *clnt; | |
538 | ||
539 | P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid); | |
540 | err = 0; | |
541 | tc = NULL; | |
542 | rc = NULL; | |
543 | clnt = fid->clnt; | |
544 | ||
545 | tc = p9_create_tremove(fid->fid); | |
546 | if (IS_ERR(tc)) { | |
547 | err = PTR_ERR(tc); | |
548 | tc = NULL; | |
549 | goto done; | |
550 | } | |
551 | ||
e2735b77 | 552 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
553 | if (err) |
554 | goto done; | |
555 | ||
556 | p9_fid_destroy(fid); | |
557 | ||
558 | done: | |
559 | kfree(tc); | |
560 | kfree(rc); | |
561 | return err; | |
562 | } | |
563 | EXPORT_SYMBOL(p9_client_remove); | |
564 | ||
565 | int p9_client_read(struct p9_fid *fid, char *data, u64 offset, u32 count) | |
566 | { | |
567 | int err, n, rsize, total; | |
568 | struct p9_fcall *tc, *rc; | |
569 | struct p9_client *clnt; | |
570 | ||
571 | P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu %d\n", fid->fid, | |
572 | (long long unsigned) offset, count); | |
573 | err = 0; | |
574 | tc = NULL; | |
575 | rc = NULL; | |
576 | clnt = fid->clnt; | |
577 | total = 0; | |
578 | ||
579 | rsize = fid->iounit; | |
580 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) | |
581 | rsize = clnt->msize - P9_IOHDRSZ; | |
582 | ||
583 | do { | |
584 | if (count < rsize) | |
585 | rsize = count; | |
586 | ||
587 | tc = p9_create_tread(fid->fid, offset, rsize); | |
588 | if (IS_ERR(tc)) { | |
589 | err = PTR_ERR(tc); | |
590 | tc = NULL; | |
591 | goto error; | |
592 | } | |
593 | ||
e2735b77 | 594 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
595 | if (err) |
596 | goto error; | |
597 | ||
598 | n = rc->params.rread.count; | |
599 | if (n > count) | |
600 | n = count; | |
601 | ||
602 | memmove(data, rc->params.rread.data, n); | |
603 | count -= n; | |
604 | data += n; | |
605 | offset += n; | |
606 | total += n; | |
607 | kfree(tc); | |
608 | tc = NULL; | |
609 | kfree(rc); | |
610 | rc = NULL; | |
611 | } while (count > 0 && n == rsize); | |
612 | ||
613 | return total; | |
614 | ||
615 | error: | |
616 | kfree(tc); | |
617 | kfree(rc); | |
618 | return err; | |
619 | } | |
620 | EXPORT_SYMBOL(p9_client_read); | |
621 | ||
622 | int p9_client_write(struct p9_fid *fid, char *data, u64 offset, u32 count) | |
623 | { | |
624 | int err, n, rsize, total; | |
625 | struct p9_fcall *tc, *rc; | |
626 | struct p9_client *clnt; | |
627 | ||
628 | P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid, | |
629 | (long long unsigned) offset, count); | |
630 | err = 0; | |
631 | tc = NULL; | |
632 | rc = NULL; | |
633 | clnt = fid->clnt; | |
634 | total = 0; | |
635 | ||
636 | rsize = fid->iounit; | |
637 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) | |
638 | rsize = clnt->msize - P9_IOHDRSZ; | |
639 | ||
640 | do { | |
641 | if (count < rsize) | |
642 | rsize = count; | |
643 | ||
644 | tc = p9_create_twrite(fid->fid, offset, rsize, data); | |
645 | if (IS_ERR(tc)) { | |
646 | err = PTR_ERR(tc); | |
647 | tc = NULL; | |
648 | goto error; | |
649 | } | |
650 | ||
e2735b77 | 651 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
652 | if (err) |
653 | goto error; | |
654 | ||
655 | n = rc->params.rread.count; | |
656 | count -= n; | |
657 | data += n; | |
658 | offset += n; | |
659 | total += n; | |
660 | kfree(tc); | |
661 | tc = NULL; | |
662 | kfree(rc); | |
663 | rc = NULL; | |
664 | } while (count > 0); | |
665 | ||
666 | return total; | |
667 | ||
668 | error: | |
669 | kfree(tc); | |
670 | kfree(rc); | |
671 | return err; | |
672 | } | |
673 | EXPORT_SYMBOL(p9_client_write); | |
674 | ||
675 | int | |
676 | p9_client_uread(struct p9_fid *fid, char __user *data, u64 offset, u32 count) | |
677 | { | |
678 | int err, n, rsize, total; | |
679 | struct p9_fcall *tc, *rc; | |
680 | struct p9_client *clnt; | |
681 | ||
682 | P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid, | |
683 | (long long unsigned) offset, count); | |
684 | err = 0; | |
685 | tc = NULL; | |
686 | rc = NULL; | |
687 | clnt = fid->clnt; | |
688 | total = 0; | |
689 | ||
690 | rsize = fid->iounit; | |
691 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) | |
692 | rsize = clnt->msize - P9_IOHDRSZ; | |
693 | ||
694 | do { | |
695 | if (count < rsize) | |
696 | rsize = count; | |
697 | ||
698 | tc = p9_create_tread(fid->fid, offset, rsize); | |
699 | if (IS_ERR(tc)) { | |
700 | err = PTR_ERR(tc); | |
701 | tc = NULL; | |
702 | goto error; | |
703 | } | |
704 | ||
e2735b77 | 705 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
706 | if (err) |
707 | goto error; | |
708 | ||
709 | n = rc->params.rread.count; | |
710 | if (n > count) | |
711 | n = count; | |
712 | ||
713 | err = copy_to_user(data, rc->params.rread.data, n); | |
714 | if (err) { | |
715 | err = -EFAULT; | |
716 | goto error; | |
717 | } | |
718 | ||
719 | count -= n; | |
720 | data += n; | |
721 | offset += n; | |
722 | total += n; | |
723 | kfree(tc); | |
724 | tc = NULL; | |
725 | kfree(rc); | |
726 | rc = NULL; | |
727 | } while (count > 0 && n == rsize); | |
728 | ||
729 | return total; | |
730 | ||
731 | error: | |
732 | kfree(tc); | |
733 | kfree(rc); | |
734 | return err; | |
735 | } | |
736 | EXPORT_SYMBOL(p9_client_uread); | |
737 | ||
738 | int | |
739 | p9_client_uwrite(struct p9_fid *fid, const char __user *data, u64 offset, | |
740 | u32 count) | |
741 | { | |
742 | int err, n, rsize, total; | |
743 | struct p9_fcall *tc, *rc; | |
744 | struct p9_client *clnt; | |
745 | ||
746 | P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid, | |
747 | (long long unsigned) offset, count); | |
748 | err = 0; | |
749 | tc = NULL; | |
750 | rc = NULL; | |
751 | clnt = fid->clnt; | |
752 | total = 0; | |
753 | ||
754 | rsize = fid->iounit; | |
755 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) | |
756 | rsize = clnt->msize - P9_IOHDRSZ; | |
757 | ||
758 | do { | |
759 | if (count < rsize) | |
760 | rsize = count; | |
761 | ||
762 | tc = p9_create_twrite_u(fid->fid, offset, rsize, data); | |
763 | if (IS_ERR(tc)) { | |
764 | err = PTR_ERR(tc); | |
765 | tc = NULL; | |
766 | goto error; | |
767 | } | |
768 | ||
e2735b77 | 769 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
770 | if (err) |
771 | goto error; | |
772 | ||
773 | n = rc->params.rread.count; | |
774 | count -= n; | |
775 | data += n; | |
776 | offset += n; | |
777 | total += n; | |
778 | kfree(tc); | |
779 | tc = NULL; | |
780 | kfree(rc); | |
781 | rc = NULL; | |
782 | } while (count > 0); | |
783 | ||
784 | return total; | |
785 | ||
786 | error: | |
787 | kfree(tc); | |
788 | kfree(rc); | |
789 | return err; | |
790 | } | |
791 | EXPORT_SYMBOL(p9_client_uwrite); | |
792 | ||
793 | int p9_client_readn(struct p9_fid *fid, char *data, u64 offset, u32 count) | |
794 | { | |
795 | int n, total; | |
796 | ||
797 | P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid, | |
798 | (long long unsigned) offset, count); | |
799 | n = 0; | |
800 | total = 0; | |
801 | while (count) { | |
802 | n = p9_client_read(fid, data, offset, count); | |
803 | if (n <= 0) | |
804 | break; | |
805 | ||
806 | data += n; | |
807 | offset += n; | |
808 | count -= n; | |
809 | total += n; | |
810 | } | |
811 | ||
812 | if (n < 0) | |
813 | total = n; | |
814 | ||
815 | return total; | |
816 | } | |
817 | EXPORT_SYMBOL(p9_client_readn); | |
818 | ||
819 | struct p9_stat *p9_client_stat(struct p9_fid *fid) | |
820 | { | |
821 | int err; | |
822 | struct p9_fcall *tc, *rc; | |
823 | struct p9_client *clnt; | |
824 | struct p9_stat *ret; | |
825 | ||
826 | P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid); | |
827 | err = 0; | |
828 | tc = NULL; | |
829 | rc = NULL; | |
830 | ret = NULL; | |
831 | clnt = fid->clnt; | |
832 | ||
833 | tc = p9_create_tstat(fid->fid); | |
834 | if (IS_ERR(tc)) { | |
835 | err = PTR_ERR(tc); | |
836 | tc = NULL; | |
837 | goto error; | |
838 | } | |
839 | ||
e2735b77 | 840 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
841 | if (err) |
842 | goto error; | |
843 | ||
844 | ret = p9_clone_stat(&rc->params.rstat.stat, clnt->dotu); | |
845 | if (IS_ERR(ret)) { | |
846 | err = PTR_ERR(ret); | |
847 | ret = NULL; | |
848 | goto error; | |
849 | } | |
850 | ||
851 | kfree(tc); | |
852 | kfree(rc); | |
853 | return ret; | |
854 | ||
855 | error: | |
856 | kfree(tc); | |
857 | kfree(rc); | |
858 | kfree(ret); | |
859 | return ERR_PTR(err); | |
860 | } | |
861 | EXPORT_SYMBOL(p9_client_stat); | |
862 | ||
863 | int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) | |
864 | { | |
865 | int err; | |
866 | struct p9_fcall *tc, *rc; | |
867 | struct p9_client *clnt; | |
868 | ||
869 | P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid); | |
870 | err = 0; | |
871 | tc = NULL; | |
872 | rc = NULL; | |
873 | clnt = fid->clnt; | |
874 | ||
875 | tc = p9_create_twstat(fid->fid, wst, clnt->dotu); | |
876 | if (IS_ERR(tc)) { | |
877 | err = PTR_ERR(tc); | |
878 | tc = NULL; | |
879 | goto done; | |
880 | } | |
881 | ||
e2735b77 | 882 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
883 | |
884 | done: | |
885 | kfree(tc); | |
886 | kfree(rc); | |
887 | return err; | |
888 | } | |
889 | EXPORT_SYMBOL(p9_client_wstat); | |
890 | ||
891 | struct p9_stat *p9_client_dirread(struct p9_fid *fid, u64 offset) | |
892 | { | |
893 | int err, n, m; | |
894 | struct p9_fcall *tc, *rc; | |
895 | struct p9_client *clnt; | |
896 | struct p9_stat st, *ret; | |
897 | ||
898 | P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu\n", fid->fid, | |
899 | (long long unsigned) offset); | |
900 | err = 0; | |
901 | tc = NULL; | |
902 | rc = NULL; | |
903 | ret = NULL; | |
904 | clnt = fid->clnt; | |
905 | ||
906 | /* if the offset is below or above the current response, free it */ | |
907 | if (offset < fid->rdir_fpos || (fid->rdir_fcall && | |
908 | offset >= fid->rdir_fpos+fid->rdir_fcall->params.rread.count)) { | |
909 | fid->rdir_pos = 0; | |
910 | if (fid->rdir_fcall) | |
911 | fid->rdir_fpos += fid->rdir_fcall->params.rread.count; | |
912 | ||
913 | kfree(fid->rdir_fcall); | |
914 | fid->rdir_fcall = NULL; | |
915 | if (offset < fid->rdir_fpos) | |
916 | fid->rdir_fpos = 0; | |
917 | } | |
918 | ||
919 | if (!fid->rdir_fcall) { | |
920 | n = fid->iounit; | |
921 | if (!n || n > clnt->msize-P9_IOHDRSZ) | |
922 | n = clnt->msize - P9_IOHDRSZ; | |
923 | ||
924 | while (1) { | |
925 | if (fid->rdir_fcall) { | |
926 | fid->rdir_fpos += | |
927 | fid->rdir_fcall->params.rread.count; | |
928 | kfree(fid->rdir_fcall); | |
929 | fid->rdir_fcall = NULL; | |
930 | } | |
931 | ||
932 | tc = p9_create_tread(fid->fid, fid->rdir_fpos, n); | |
933 | if (IS_ERR(tc)) { | |
934 | err = PTR_ERR(tc); | |
935 | tc = NULL; | |
936 | goto error; | |
937 | } | |
938 | ||
e2735b77 | 939 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
940 | if (err) |
941 | goto error; | |
942 | ||
943 | n = rc->params.rread.count; | |
944 | if (n == 0) | |
945 | goto done; | |
946 | ||
947 | fid->rdir_fcall = rc; | |
948 | rc = NULL; | |
949 | if (offset >= fid->rdir_fpos && | |
950 | offset < fid->rdir_fpos+n) | |
951 | break; | |
952 | } | |
953 | ||
954 | fid->rdir_pos = 0; | |
955 | } | |
956 | ||
957 | m = offset - fid->rdir_fpos; | |
958 | if (m < 0) | |
959 | goto done; | |
960 | ||
961 | n = p9_deserialize_stat(fid->rdir_fcall->params.rread.data + m, | |
962 | fid->rdir_fcall->params.rread.count - m, &st, clnt->dotu); | |
963 | ||
964 | if (!n) { | |
965 | err = -EIO; | |
966 | goto error; | |
967 | } | |
968 | ||
969 | fid->rdir_pos += n; | |
970 | st.size = n; | |
971 | ret = p9_clone_stat(&st, clnt->dotu); | |
972 | if (IS_ERR(ret)) { | |
973 | err = PTR_ERR(ret); | |
974 | ret = NULL; | |
975 | goto error; | |
976 | } | |
977 | ||
978 | done: | |
979 | kfree(tc); | |
980 | kfree(rc); | |
981 | return ret; | |
982 | ||
983 | error: | |
984 | kfree(tc); | |
985 | kfree(rc); | |
986 | kfree(ret); | |
987 | return ERR_PTR(err); | |
988 | } | |
989 | EXPORT_SYMBOL(p9_client_dirread); | |
990 | ||
991 | static struct p9_stat *p9_clone_stat(struct p9_stat *st, int dotu) | |
992 | { | |
993 | int n; | |
994 | char *p; | |
995 | struct p9_stat *ret; | |
996 | ||
997 | n = sizeof(struct p9_stat) + st->name.len + st->uid.len + st->gid.len + | |
998 | st->muid.len; | |
999 | ||
1000 | if (dotu) | |
1001 | n += st->extension.len; | |
1002 | ||
1003 | ret = kmalloc(n, GFP_KERNEL); | |
1004 | if (!ret) | |
1005 | return ERR_PTR(-ENOMEM); | |
1006 | ||
1007 | memmove(ret, st, sizeof(struct p9_stat)); | |
1008 | p = ((char *) ret) + sizeof(struct p9_stat); | |
1009 | memmove(p, st->name.str, st->name.len); | |
afcf0c13 | 1010 | ret->name.str = p; |
bd238fb4 LI |
1011 | p += st->name.len; |
1012 | memmove(p, st->uid.str, st->uid.len); | |
afcf0c13 | 1013 | ret->uid.str = p; |
bd238fb4 LI |
1014 | p += st->uid.len; |
1015 | memmove(p, st->gid.str, st->gid.len); | |
afcf0c13 | 1016 | ret->gid.str = p; |
bd238fb4 LI |
1017 | p += st->gid.len; |
1018 | memmove(p, st->muid.str, st->muid.len); | |
afcf0c13 | 1019 | ret->muid.str = p; |
bd238fb4 LI |
1020 | p += st->muid.len; |
1021 | ||
1022 | if (dotu) { | |
1023 | memmove(p, st->extension.str, st->extension.len); | |
afcf0c13 | 1024 | ret->extension.str = p; |
bd238fb4 LI |
1025 | p += st->extension.len; |
1026 | } | |
1027 | ||
1028 | return ret; | |
1029 | } | |
1030 | ||
1031 | static struct p9_fid *p9_fid_create(struct p9_client *clnt) | |
1032 | { | |
1033 | int err; | |
1034 | struct p9_fid *fid; | |
1035 | ||
1036 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); | |
1037 | fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); | |
1038 | if (!fid) | |
1039 | return ERR_PTR(-ENOMEM); | |
1040 | ||
1041 | fid->fid = p9_idpool_get(clnt->fidpool); | |
1042 | if (fid->fid < 0) { | |
1043 | err = -ENOSPC; | |
1044 | goto error; | |
1045 | } | |
1046 | ||
1047 | memset(&fid->qid, 0, sizeof(struct p9_qid)); | |
1048 | fid->mode = -1; | |
1049 | fid->rdir_fpos = 0; | |
1050 | fid->rdir_pos = 0; | |
1051 | fid->rdir_fcall = NULL; | |
1052 | fid->uid = current->fsuid; | |
1053 | fid->clnt = clnt; | |
1054 | fid->aux = NULL; | |
1055 | ||
1056 | spin_lock(&clnt->lock); | |
1057 | list_add(&fid->flist, &clnt->fidlist); | |
1058 | spin_unlock(&clnt->lock); | |
1059 | ||
1060 | return fid; | |
1061 | ||
1062 | error: | |
1063 | kfree(fid); | |
1064 | return ERR_PTR(err); | |
1065 | } | |
1066 | ||
1067 | static void p9_fid_destroy(struct p9_fid *fid) | |
1068 | { | |
1069 | struct p9_client *clnt; | |
1070 | ||
1071 | P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid); | |
1072 | clnt = fid->clnt; | |
1073 | p9_idpool_put(fid->fid, clnt->fidpool); | |
1074 | spin_lock(&clnt->lock); | |
1075 | list_del(&fid->flist); | |
1076 | spin_unlock(&clnt->lock); | |
1077 | kfree(fid->rdir_fcall); | |
1078 | kfree(fid); | |
1079 | } |