Commit | Line | Data |
---|---|---|
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 | ||
a447c093 | 55 | static const match_table_t tokens = { |
8a0dc95f EVH |
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 | 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 | ||
127 | ||
043aba40 EVH |
128 | /** |
129 | * p9_client_rpc - sends 9P request and waits until a response is available. | |
130 | * The function can be interrupted. | |
131 | * @c: client data | |
132 | * @tc: request to be sent | |
133 | * @rc: pointer where a pointer to the response is stored | |
134 | */ | |
135 | int | |
136 | p9_client_rpc(struct p9_client *c, struct p9_fcall *tc, | |
137 | struct p9_fcall **rc) | |
138 | { | |
8a0dc95f | 139 | return c->trans->rpc(c->trans, tc, rc); |
043aba40 EVH |
140 | } |
141 | ||
8a0dc95f | 142 | struct p9_client *p9_client_create(const char *dev_name, char *options) |
bd238fb4 LI |
143 | { |
144 | int err, n; | |
145 | struct p9_client *clnt; | |
146 | struct p9_fcall *tc, *rc; | |
147 | struct p9_str *version; | |
148 | ||
149 | err = 0; | |
150 | tc = NULL; | |
151 | rc = NULL; | |
152 | clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); | |
153 | if (!clnt) | |
154 | return ERR_PTR(-ENOMEM); | |
155 | ||
72029fe8 | 156 | clnt->trans_mod = NULL; |
bb8ffdfc | 157 | clnt->trans = NULL; |
bd238fb4 | 158 | spin_lock_init(&clnt->lock); |
bd238fb4 LI |
159 | INIT_LIST_HEAD(&clnt->fidlist); |
160 | clnt->fidpool = p9_idpool_create(); | |
728fc4ef | 161 | if (IS_ERR(clnt->fidpool)) { |
bd238fb4 LI |
162 | err = PTR_ERR(clnt->fidpool); |
163 | clnt->fidpool = NULL; | |
164 | goto error; | |
165 | } | |
166 | ||
bb8ffdfc EVH |
167 | err = parse_opts(options, clnt); |
168 | if (err < 0) | |
169 | goto error; | |
170 | ||
8a0dc95f EVH |
171 | if (clnt->trans_mod == NULL) { |
172 | err = -EPROTONOSUPPORT; | |
173 | P9_DPRINTK(P9_DEBUG_ERROR, | |
174 | "No transport defined or default transport\n"); | |
175 | goto error; | |
176 | } | |
177 | ||
178 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p trans %p msize %d dotu %d\n", | |
179 | clnt, clnt->trans_mod, clnt->msize, clnt->dotu); | |
180 | ||
181 | ||
182 | clnt->trans = clnt->trans_mod->create(dev_name, options, clnt->msize, | |
183 | clnt->dotu); | |
184 | if (IS_ERR(clnt->trans)) { | |
185 | err = PTR_ERR(clnt->trans); | |
186 | clnt->trans = NULL; | |
bd238fb4 LI |
187 | goto error; |
188 | } | |
189 | ||
8a0dc95f EVH |
190 | if ((clnt->msize+P9_IOHDRSZ) > clnt->trans_mod->maxsize) |
191 | clnt->msize = clnt->trans_mod->maxsize-P9_IOHDRSZ; | |
192 | ||
bd238fb4 LI |
193 | tc = p9_create_tversion(clnt->msize, clnt->dotu?"9P2000.u":"9P2000"); |
194 | if (IS_ERR(tc)) { | |
195 | err = PTR_ERR(tc); | |
196 | tc = NULL; | |
197 | goto error; | |
198 | } | |
199 | ||
e2735b77 | 200 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
201 | if (err) |
202 | goto error; | |
203 | ||
204 | version = &rc->params.rversion.version; | |
205 | if (version->len == 8 && !memcmp(version->str, "9P2000.u", 8)) | |
206 | clnt->dotu = 1; | |
207 | else if (version->len == 6 && !memcmp(version->str, "9P2000", 6)) | |
208 | clnt->dotu = 0; | |
209 | else { | |
210 | err = -EREMOTEIO; | |
211 | goto error; | |
212 | } | |
213 | ||
214 | n = rc->params.rversion.msize; | |
215 | if (n < clnt->msize) | |
216 | clnt->msize = n; | |
217 | ||
218 | kfree(tc); | |
219 | kfree(rc); | |
220 | return clnt; | |
221 | ||
222 | error: | |
223 | kfree(tc); | |
224 | kfree(rc); | |
225 | p9_client_destroy(clnt); | |
226 | return ERR_PTR(err); | |
227 | } | |
228 | EXPORT_SYMBOL(p9_client_create); | |
229 | ||
230 | void p9_client_destroy(struct p9_client *clnt) | |
231 | { | |
232 | struct p9_fid *fid, *fidptr; | |
233 | ||
234 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); | |
bd238fb4 LI |
235 | |
236 | if (clnt->trans) { | |
237 | clnt->trans->close(clnt->trans); | |
238 | kfree(clnt->trans); | |
239 | clnt->trans = NULL; | |
240 | } | |
241 | ||
72029fe8 TH |
242 | v9fs_put_trans(clnt->trans_mod); |
243 | ||
bd238fb4 LI |
244 | list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) |
245 | p9_fid_destroy(fid); | |
246 | ||
0af8887e EVH |
247 | if (clnt->fidpool) |
248 | p9_idpool_destroy(clnt->fidpool); | |
249 | ||
bd238fb4 LI |
250 | kfree(clnt); |
251 | } | |
252 | EXPORT_SYMBOL(p9_client_destroy); | |
253 | ||
254 | void p9_client_disconnect(struct p9_client *clnt) | |
255 | { | |
256 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); | |
257 | clnt->trans->status = Disconnected; | |
bd238fb4 LI |
258 | } |
259 | EXPORT_SYMBOL(p9_client_disconnect); | |
260 | ||
261 | struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, | |
ba17674f | 262 | char *uname, u32 n_uname, char *aname) |
bd238fb4 LI |
263 | { |
264 | int err; | |
265 | struct p9_fcall *tc, *rc; | |
266 | struct p9_fid *fid; | |
267 | ||
268 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p afid %d uname %s aname %s\n", | |
269 | clnt, afid?afid->fid:-1, uname, aname); | |
270 | err = 0; | |
271 | tc = NULL; | |
272 | rc = NULL; | |
273 | ||
274 | fid = p9_fid_create(clnt); | |
275 | if (IS_ERR(fid)) { | |
276 | err = PTR_ERR(fid); | |
277 | fid = NULL; | |
278 | goto error; | |
279 | } | |
280 | ||
ba17674f LI |
281 | tc = p9_create_tattach(fid->fid, afid?afid->fid:P9_NOFID, uname, aname, |
282 | n_uname, clnt->dotu); | |
bd238fb4 LI |
283 | if (IS_ERR(tc)) { |
284 | err = PTR_ERR(tc); | |
285 | tc = NULL; | |
286 | goto error; | |
287 | } | |
288 | ||
e2735b77 | 289 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
290 | if (err) |
291 | goto error; | |
292 | ||
293 | memmove(&fid->qid, &rc->params.rattach.qid, sizeof(struct p9_qid)); | |
294 | kfree(tc); | |
295 | kfree(rc); | |
296 | return fid; | |
297 | ||
298 | error: | |
299 | kfree(tc); | |
300 | kfree(rc); | |
301 | if (fid) | |
302 | p9_fid_destroy(fid); | |
303 | return ERR_PTR(err); | |
304 | } | |
305 | EXPORT_SYMBOL(p9_client_attach); | |
306 | ||
ba17674f LI |
307 | struct p9_fid *p9_client_auth(struct p9_client *clnt, char *uname, |
308 | u32 n_uname, char *aname) | |
bd238fb4 LI |
309 | { |
310 | int err; | |
311 | struct p9_fcall *tc, *rc; | |
312 | struct p9_fid *fid; | |
313 | ||
314 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p uname %s aname %s\n", clnt, uname, | |
315 | aname); | |
316 | err = 0; | |
317 | tc = NULL; | |
318 | rc = NULL; | |
319 | ||
320 | fid = p9_fid_create(clnt); | |
321 | if (IS_ERR(fid)) { | |
322 | err = PTR_ERR(fid); | |
323 | fid = NULL; | |
324 | goto error; | |
325 | } | |
326 | ||
ba17674f | 327 | tc = p9_create_tauth(fid->fid, uname, aname, n_uname, clnt->dotu); |
bd238fb4 LI |
328 | if (IS_ERR(tc)) { |
329 | err = PTR_ERR(tc); | |
330 | tc = NULL; | |
331 | goto error; | |
332 | } | |
333 | ||
e2735b77 | 334 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
335 | if (err) |
336 | goto error; | |
337 | ||
338 | memmove(&fid->qid, &rc->params.rauth.qid, sizeof(struct p9_qid)); | |
339 | kfree(tc); | |
340 | kfree(rc); | |
341 | return fid; | |
342 | ||
343 | error: | |
344 | kfree(tc); | |
345 | kfree(rc); | |
346 | if (fid) | |
347 | p9_fid_destroy(fid); | |
348 | return ERR_PTR(err); | |
349 | } | |
350 | EXPORT_SYMBOL(p9_client_auth); | |
351 | ||
352 | struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames, | |
353 | int clone) | |
354 | { | |
355 | int err; | |
356 | struct p9_fcall *tc, *rc; | |
357 | struct p9_client *clnt; | |
358 | struct p9_fid *fid; | |
359 | ||
360 | P9_DPRINTK(P9_DEBUG_9P, "fid %d nwname %d wname[0] %s\n", | |
361 | oldfid->fid, nwname, wnames?wnames[0]:NULL); | |
362 | err = 0; | |
363 | tc = NULL; | |
364 | rc = NULL; | |
365 | clnt = oldfid->clnt; | |
366 | if (clone) { | |
367 | fid = p9_fid_create(clnt); | |
368 | if (IS_ERR(fid)) { | |
369 | err = PTR_ERR(fid); | |
370 | fid = NULL; | |
371 | goto error; | |
372 | } | |
373 | ||
374 | fid->uid = oldfid->uid; | |
375 | } else | |
376 | fid = oldfid; | |
377 | ||
378 | tc = p9_create_twalk(oldfid->fid, fid->fid, nwname, wnames); | |
379 | if (IS_ERR(tc)) { | |
380 | err = PTR_ERR(tc); | |
381 | tc = NULL; | |
382 | goto error; | |
383 | } | |
384 | ||
e2735b77 | 385 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
386 | if (err) { |
387 | if (rc && rc->id == P9_RWALK) | |
388 | goto clunk_fid; | |
389 | else | |
390 | goto error; | |
391 | } | |
392 | ||
393 | if (rc->params.rwalk.nwqid != nwname) { | |
394 | err = -ENOENT; | |
395 | goto clunk_fid; | |
396 | } | |
397 | ||
398 | if (nwname) | |
399 | memmove(&fid->qid, | |
400 | &rc->params.rwalk.wqids[rc->params.rwalk.nwqid - 1], | |
401 | sizeof(struct p9_qid)); | |
402 | else | |
403 | fid->qid = oldfid->qid; | |
404 | ||
405 | kfree(tc); | |
406 | kfree(rc); | |
407 | return fid; | |
408 | ||
409 | clunk_fid: | |
410 | kfree(tc); | |
411 | kfree(rc); | |
412 | rc = NULL; | |
413 | tc = p9_create_tclunk(fid->fid); | |
414 | if (IS_ERR(tc)) { | |
415 | err = PTR_ERR(tc); | |
416 | tc = NULL; | |
417 | goto error; | |
418 | } | |
419 | ||
e2735b77 | 420 | p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
421 | |
422 | error: | |
423 | kfree(tc); | |
424 | kfree(rc); | |
425 | if (fid && (fid != oldfid)) | |
426 | p9_fid_destroy(fid); | |
427 | ||
428 | return ERR_PTR(err); | |
429 | } | |
430 | EXPORT_SYMBOL(p9_client_walk); | |
431 | ||
432 | int p9_client_open(struct p9_fid *fid, int mode) | |
433 | { | |
434 | int err; | |
435 | struct p9_fcall *tc, *rc; | |
436 | struct p9_client *clnt; | |
437 | ||
438 | P9_DPRINTK(P9_DEBUG_9P, "fid %d mode %d\n", fid->fid, mode); | |
439 | err = 0; | |
440 | tc = NULL; | |
441 | rc = NULL; | |
442 | clnt = fid->clnt; | |
443 | ||
444 | if (fid->mode != -1) | |
445 | return -EINVAL; | |
446 | ||
447 | tc = p9_create_topen(fid->fid, mode); | |
448 | if (IS_ERR(tc)) { | |
449 | err = PTR_ERR(tc); | |
450 | tc = NULL; | |
451 | goto done; | |
452 | } | |
453 | ||
e2735b77 | 454 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
455 | if (err) |
456 | goto done; | |
457 | ||
458 | fid->mode = mode; | |
459 | fid->iounit = rc->params.ropen.iounit; | |
460 | ||
461 | done: | |
462 | kfree(tc); | |
463 | kfree(rc); | |
464 | return err; | |
465 | } | |
466 | EXPORT_SYMBOL(p9_client_open); | |
467 | ||
468 | int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode, | |
469 | char *extension) | |
470 | { | |
471 | int err; | |
472 | struct p9_fcall *tc, *rc; | |
473 | struct p9_client *clnt; | |
474 | ||
475 | P9_DPRINTK(P9_DEBUG_9P, "fid %d name %s perm %d mode %d\n", fid->fid, | |
476 | name, perm, mode); | |
477 | err = 0; | |
478 | tc = NULL; | |
479 | rc = NULL; | |
480 | clnt = fid->clnt; | |
481 | ||
482 | if (fid->mode != -1) | |
483 | return -EINVAL; | |
484 | ||
485 | tc = p9_create_tcreate(fid->fid, name, perm, mode, extension, | |
486 | clnt->dotu); | |
487 | if (IS_ERR(tc)) { | |
488 | err = PTR_ERR(tc); | |
489 | tc = NULL; | |
490 | goto done; | |
491 | } | |
492 | ||
e2735b77 | 493 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
494 | if (err) |
495 | goto done; | |
496 | ||
497 | fid->mode = mode; | |
498 | fid->iounit = rc->params.ropen.iounit; | |
499 | ||
500 | done: | |
501 | kfree(tc); | |
502 | kfree(rc); | |
503 | return err; | |
504 | } | |
505 | EXPORT_SYMBOL(p9_client_fcreate); | |
506 | ||
507 | int p9_client_clunk(struct p9_fid *fid) | |
508 | { | |
509 | int err; | |
510 | struct p9_fcall *tc, *rc; | |
511 | struct p9_client *clnt; | |
512 | ||
513 | P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid); | |
514 | err = 0; | |
515 | tc = NULL; | |
516 | rc = NULL; | |
517 | clnt = fid->clnt; | |
518 | ||
519 | tc = p9_create_tclunk(fid->fid); | |
520 | if (IS_ERR(tc)) { | |
521 | err = PTR_ERR(tc); | |
522 | tc = NULL; | |
523 | goto done; | |
524 | } | |
525 | ||
e2735b77 | 526 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
527 | if (err) |
528 | goto done; | |
529 | ||
530 | p9_fid_destroy(fid); | |
531 | ||
532 | done: | |
533 | kfree(tc); | |
534 | kfree(rc); | |
535 | return err; | |
536 | } | |
537 | EXPORT_SYMBOL(p9_client_clunk); | |
538 | ||
539 | int p9_client_remove(struct p9_fid *fid) | |
540 | { | |
541 | int err; | |
542 | struct p9_fcall *tc, *rc; | |
543 | struct p9_client *clnt; | |
544 | ||
545 | P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid); | |
546 | err = 0; | |
547 | tc = NULL; | |
548 | rc = NULL; | |
549 | clnt = fid->clnt; | |
550 | ||
551 | tc = p9_create_tremove(fid->fid); | |
552 | if (IS_ERR(tc)) { | |
553 | err = PTR_ERR(tc); | |
554 | tc = NULL; | |
555 | goto done; | |
556 | } | |
557 | ||
e2735b77 | 558 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
559 | if (err) |
560 | goto done; | |
561 | ||
562 | p9_fid_destroy(fid); | |
563 | ||
564 | done: | |
565 | kfree(tc); | |
566 | kfree(rc); | |
567 | return err; | |
568 | } | |
569 | EXPORT_SYMBOL(p9_client_remove); | |
570 | ||
571 | int p9_client_read(struct p9_fid *fid, char *data, u64 offset, u32 count) | |
572 | { | |
573 | int err, n, rsize, total; | |
574 | struct p9_fcall *tc, *rc; | |
575 | struct p9_client *clnt; | |
576 | ||
577 | P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu %d\n", fid->fid, | |
578 | (long long unsigned) offset, count); | |
579 | err = 0; | |
580 | tc = NULL; | |
581 | rc = NULL; | |
582 | clnt = fid->clnt; | |
583 | total = 0; | |
584 | ||
585 | rsize = fid->iounit; | |
586 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) | |
587 | rsize = clnt->msize - P9_IOHDRSZ; | |
588 | ||
589 | do { | |
590 | if (count < rsize) | |
591 | rsize = count; | |
592 | ||
593 | tc = p9_create_tread(fid->fid, offset, rsize); | |
594 | if (IS_ERR(tc)) { | |
595 | err = PTR_ERR(tc); | |
596 | tc = NULL; | |
597 | goto error; | |
598 | } | |
599 | ||
e2735b77 | 600 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
601 | if (err) |
602 | goto error; | |
603 | ||
604 | n = rc->params.rread.count; | |
605 | if (n > count) | |
606 | n = count; | |
607 | ||
608 | memmove(data, rc->params.rread.data, n); | |
609 | count -= n; | |
610 | data += n; | |
611 | offset += n; | |
612 | total += n; | |
613 | kfree(tc); | |
614 | tc = NULL; | |
615 | kfree(rc); | |
616 | rc = NULL; | |
617 | } while (count > 0 && n == rsize); | |
618 | ||
619 | return total; | |
620 | ||
621 | error: | |
622 | kfree(tc); | |
623 | kfree(rc); | |
624 | return err; | |
625 | } | |
626 | EXPORT_SYMBOL(p9_client_read); | |
627 | ||
628 | int p9_client_write(struct p9_fid *fid, char *data, u64 offset, u32 count) | |
629 | { | |
630 | int err, n, rsize, total; | |
631 | struct p9_fcall *tc, *rc; | |
632 | struct p9_client *clnt; | |
633 | ||
634 | P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid, | |
635 | (long long unsigned) offset, count); | |
636 | err = 0; | |
637 | tc = NULL; | |
638 | rc = NULL; | |
639 | clnt = fid->clnt; | |
640 | total = 0; | |
641 | ||
642 | rsize = fid->iounit; | |
643 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) | |
644 | rsize = clnt->msize - P9_IOHDRSZ; | |
645 | ||
646 | do { | |
647 | if (count < rsize) | |
648 | rsize = count; | |
649 | ||
650 | tc = p9_create_twrite(fid->fid, offset, rsize, data); | |
651 | if (IS_ERR(tc)) { | |
652 | err = PTR_ERR(tc); | |
653 | tc = NULL; | |
654 | goto error; | |
655 | } | |
656 | ||
e2735b77 | 657 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
658 | if (err) |
659 | goto error; | |
660 | ||
661 | n = rc->params.rread.count; | |
662 | count -= n; | |
663 | data += n; | |
664 | offset += n; | |
665 | total += n; | |
666 | kfree(tc); | |
667 | tc = NULL; | |
668 | kfree(rc); | |
669 | rc = NULL; | |
670 | } while (count > 0); | |
671 | ||
672 | return total; | |
673 | ||
674 | error: | |
675 | kfree(tc); | |
676 | kfree(rc); | |
677 | return err; | |
678 | } | |
679 | EXPORT_SYMBOL(p9_client_write); | |
680 | ||
681 | int | |
682 | p9_client_uread(struct p9_fid *fid, char __user *data, u64 offset, u32 count) | |
683 | { | |
684 | int err, n, rsize, total; | |
685 | struct p9_fcall *tc, *rc; | |
686 | struct p9_client *clnt; | |
687 | ||
688 | P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid, | |
689 | (long long unsigned) offset, count); | |
690 | err = 0; | |
691 | tc = NULL; | |
692 | rc = NULL; | |
693 | clnt = fid->clnt; | |
694 | total = 0; | |
695 | ||
696 | rsize = fid->iounit; | |
697 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) | |
698 | rsize = clnt->msize - P9_IOHDRSZ; | |
699 | ||
700 | do { | |
701 | if (count < rsize) | |
702 | rsize = count; | |
703 | ||
704 | tc = p9_create_tread(fid->fid, offset, rsize); | |
705 | if (IS_ERR(tc)) { | |
706 | err = PTR_ERR(tc); | |
707 | tc = NULL; | |
708 | goto error; | |
709 | } | |
710 | ||
e2735b77 | 711 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
712 | if (err) |
713 | goto error; | |
714 | ||
715 | n = rc->params.rread.count; | |
716 | if (n > count) | |
717 | n = count; | |
718 | ||
719 | err = copy_to_user(data, rc->params.rread.data, n); | |
720 | if (err) { | |
721 | err = -EFAULT; | |
722 | goto error; | |
723 | } | |
724 | ||
725 | count -= n; | |
726 | data += n; | |
727 | offset += n; | |
728 | total += n; | |
729 | kfree(tc); | |
730 | tc = NULL; | |
731 | kfree(rc); | |
732 | rc = NULL; | |
733 | } while (count > 0 && n == rsize); | |
734 | ||
735 | return total; | |
736 | ||
737 | error: | |
738 | kfree(tc); | |
739 | kfree(rc); | |
740 | return err; | |
741 | } | |
742 | EXPORT_SYMBOL(p9_client_uread); | |
743 | ||
744 | int | |
745 | p9_client_uwrite(struct p9_fid *fid, const char __user *data, u64 offset, | |
746 | u32 count) | |
747 | { | |
748 | int err, n, rsize, total; | |
749 | struct p9_fcall *tc, *rc; | |
750 | struct p9_client *clnt; | |
751 | ||
752 | P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid, | |
753 | (long long unsigned) offset, count); | |
754 | err = 0; | |
755 | tc = NULL; | |
756 | rc = NULL; | |
757 | clnt = fid->clnt; | |
758 | total = 0; | |
759 | ||
760 | rsize = fid->iounit; | |
761 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) | |
762 | rsize = clnt->msize - P9_IOHDRSZ; | |
763 | ||
764 | do { | |
765 | if (count < rsize) | |
766 | rsize = count; | |
767 | ||
768 | tc = p9_create_twrite_u(fid->fid, offset, rsize, data); | |
769 | if (IS_ERR(tc)) { | |
770 | err = PTR_ERR(tc); | |
771 | tc = NULL; | |
772 | goto error; | |
773 | } | |
774 | ||
e2735b77 | 775 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
776 | if (err) |
777 | goto error; | |
778 | ||
779 | n = rc->params.rread.count; | |
780 | count -= n; | |
781 | data += n; | |
782 | offset += n; | |
783 | total += n; | |
784 | kfree(tc); | |
785 | tc = NULL; | |
786 | kfree(rc); | |
787 | rc = NULL; | |
788 | } while (count > 0); | |
789 | ||
790 | return total; | |
791 | ||
792 | error: | |
793 | kfree(tc); | |
794 | kfree(rc); | |
795 | return err; | |
796 | } | |
797 | EXPORT_SYMBOL(p9_client_uwrite); | |
798 | ||
799 | int p9_client_readn(struct p9_fid *fid, char *data, u64 offset, u32 count) | |
800 | { | |
801 | int n, total; | |
802 | ||
803 | P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid, | |
804 | (long long unsigned) offset, count); | |
805 | n = 0; | |
806 | total = 0; | |
807 | while (count) { | |
808 | n = p9_client_read(fid, data, offset, count); | |
809 | if (n <= 0) | |
810 | break; | |
811 | ||
812 | data += n; | |
813 | offset += n; | |
814 | count -= n; | |
815 | total += n; | |
816 | } | |
817 | ||
818 | if (n < 0) | |
819 | total = n; | |
820 | ||
821 | return total; | |
822 | } | |
823 | EXPORT_SYMBOL(p9_client_readn); | |
824 | ||
825 | struct p9_stat *p9_client_stat(struct p9_fid *fid) | |
826 | { | |
827 | int err; | |
828 | struct p9_fcall *tc, *rc; | |
829 | struct p9_client *clnt; | |
830 | struct p9_stat *ret; | |
831 | ||
832 | P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid); | |
833 | err = 0; | |
834 | tc = NULL; | |
835 | rc = NULL; | |
836 | ret = NULL; | |
837 | clnt = fid->clnt; | |
838 | ||
839 | tc = p9_create_tstat(fid->fid); | |
840 | if (IS_ERR(tc)) { | |
841 | err = PTR_ERR(tc); | |
842 | tc = NULL; | |
843 | goto error; | |
844 | } | |
845 | ||
e2735b77 | 846 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
847 | if (err) |
848 | goto error; | |
849 | ||
850 | ret = p9_clone_stat(&rc->params.rstat.stat, clnt->dotu); | |
851 | if (IS_ERR(ret)) { | |
852 | err = PTR_ERR(ret); | |
853 | ret = NULL; | |
854 | goto error; | |
855 | } | |
856 | ||
857 | kfree(tc); | |
858 | kfree(rc); | |
859 | return ret; | |
860 | ||
861 | error: | |
862 | kfree(tc); | |
863 | kfree(rc); | |
864 | kfree(ret); | |
865 | return ERR_PTR(err); | |
866 | } | |
867 | EXPORT_SYMBOL(p9_client_stat); | |
868 | ||
869 | int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) | |
870 | { | |
871 | int err; | |
872 | struct p9_fcall *tc, *rc; | |
873 | struct p9_client *clnt; | |
874 | ||
875 | P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid); | |
876 | err = 0; | |
877 | tc = NULL; | |
878 | rc = NULL; | |
879 | clnt = fid->clnt; | |
880 | ||
881 | tc = p9_create_twstat(fid->fid, wst, clnt->dotu); | |
882 | if (IS_ERR(tc)) { | |
883 | err = PTR_ERR(tc); | |
884 | tc = NULL; | |
885 | goto done; | |
886 | } | |
887 | ||
e2735b77 | 888 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
889 | |
890 | done: | |
891 | kfree(tc); | |
892 | kfree(rc); | |
893 | return err; | |
894 | } | |
895 | EXPORT_SYMBOL(p9_client_wstat); | |
896 | ||
897 | struct p9_stat *p9_client_dirread(struct p9_fid *fid, u64 offset) | |
898 | { | |
899 | int err, n, m; | |
900 | struct p9_fcall *tc, *rc; | |
901 | struct p9_client *clnt; | |
902 | struct p9_stat st, *ret; | |
903 | ||
904 | P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu\n", fid->fid, | |
905 | (long long unsigned) offset); | |
906 | err = 0; | |
907 | tc = NULL; | |
908 | rc = NULL; | |
909 | ret = NULL; | |
910 | clnt = fid->clnt; | |
911 | ||
912 | /* if the offset is below or above the current response, free it */ | |
913 | if (offset < fid->rdir_fpos || (fid->rdir_fcall && | |
914 | offset >= fid->rdir_fpos+fid->rdir_fcall->params.rread.count)) { | |
915 | fid->rdir_pos = 0; | |
916 | if (fid->rdir_fcall) | |
917 | fid->rdir_fpos += fid->rdir_fcall->params.rread.count; | |
918 | ||
919 | kfree(fid->rdir_fcall); | |
920 | fid->rdir_fcall = NULL; | |
921 | if (offset < fid->rdir_fpos) | |
922 | fid->rdir_fpos = 0; | |
923 | } | |
924 | ||
925 | if (!fid->rdir_fcall) { | |
926 | n = fid->iounit; | |
927 | if (!n || n > clnt->msize-P9_IOHDRSZ) | |
928 | n = clnt->msize - P9_IOHDRSZ; | |
929 | ||
930 | while (1) { | |
931 | if (fid->rdir_fcall) { | |
932 | fid->rdir_fpos += | |
933 | fid->rdir_fcall->params.rread.count; | |
934 | kfree(fid->rdir_fcall); | |
935 | fid->rdir_fcall = NULL; | |
936 | } | |
937 | ||
938 | tc = p9_create_tread(fid->fid, fid->rdir_fpos, n); | |
939 | if (IS_ERR(tc)) { | |
940 | err = PTR_ERR(tc); | |
941 | tc = NULL; | |
942 | goto error; | |
943 | } | |
944 | ||
e2735b77 | 945 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
946 | if (err) |
947 | goto error; | |
948 | ||
949 | n = rc->params.rread.count; | |
950 | if (n == 0) | |
951 | goto done; | |
952 | ||
953 | fid->rdir_fcall = rc; | |
954 | rc = NULL; | |
955 | if (offset >= fid->rdir_fpos && | |
956 | offset < fid->rdir_fpos+n) | |
957 | break; | |
958 | } | |
959 | ||
960 | fid->rdir_pos = 0; | |
961 | } | |
962 | ||
963 | m = offset - fid->rdir_fpos; | |
964 | if (m < 0) | |
965 | goto done; | |
966 | ||
967 | n = p9_deserialize_stat(fid->rdir_fcall->params.rread.data + m, | |
968 | fid->rdir_fcall->params.rread.count - m, &st, clnt->dotu); | |
969 | ||
970 | if (!n) { | |
971 | err = -EIO; | |
972 | goto error; | |
973 | } | |
974 | ||
975 | fid->rdir_pos += n; | |
976 | st.size = n; | |
977 | ret = p9_clone_stat(&st, clnt->dotu); | |
978 | if (IS_ERR(ret)) { | |
979 | err = PTR_ERR(ret); | |
980 | ret = NULL; | |
981 | goto error; | |
982 | } | |
983 | ||
984 | done: | |
985 | kfree(tc); | |
986 | kfree(rc); | |
987 | return ret; | |
988 | ||
989 | error: | |
990 | kfree(tc); | |
991 | kfree(rc); | |
992 | kfree(ret); | |
993 | return ERR_PTR(err); | |
994 | } | |
995 | EXPORT_SYMBOL(p9_client_dirread); | |
996 | ||
997 | static struct p9_stat *p9_clone_stat(struct p9_stat *st, int dotu) | |
998 | { | |
999 | int n; | |
1000 | char *p; | |
1001 | struct p9_stat *ret; | |
1002 | ||
1003 | n = sizeof(struct p9_stat) + st->name.len + st->uid.len + st->gid.len + | |
1004 | st->muid.len; | |
1005 | ||
1006 | if (dotu) | |
1007 | n += st->extension.len; | |
1008 | ||
1009 | ret = kmalloc(n, GFP_KERNEL); | |
1010 | if (!ret) | |
1011 | return ERR_PTR(-ENOMEM); | |
1012 | ||
1013 | memmove(ret, st, sizeof(struct p9_stat)); | |
1014 | p = ((char *) ret) + sizeof(struct p9_stat); | |
1015 | memmove(p, st->name.str, st->name.len); | |
afcf0c13 | 1016 | ret->name.str = p; |
bd238fb4 LI |
1017 | p += st->name.len; |
1018 | memmove(p, st->uid.str, st->uid.len); | |
afcf0c13 | 1019 | ret->uid.str = p; |
bd238fb4 LI |
1020 | p += st->uid.len; |
1021 | memmove(p, st->gid.str, st->gid.len); | |
afcf0c13 | 1022 | ret->gid.str = p; |
bd238fb4 LI |
1023 | p += st->gid.len; |
1024 | memmove(p, st->muid.str, st->muid.len); | |
afcf0c13 | 1025 | ret->muid.str = p; |
bd238fb4 LI |
1026 | p += st->muid.len; |
1027 | ||
1028 | if (dotu) { | |
1029 | memmove(p, st->extension.str, st->extension.len); | |
afcf0c13 | 1030 | ret->extension.str = p; |
bd238fb4 LI |
1031 | p += st->extension.len; |
1032 | } | |
1033 | ||
1034 | return ret; | |
1035 | } | |
1036 | ||
1037 | static struct p9_fid *p9_fid_create(struct p9_client *clnt) | |
1038 | { | |
1039 | int err; | |
1040 | struct p9_fid *fid; | |
1041 | ||
1042 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); | |
1043 | fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); | |
1044 | if (!fid) | |
1045 | return ERR_PTR(-ENOMEM); | |
1046 | ||
1047 | fid->fid = p9_idpool_get(clnt->fidpool); | |
1048 | if (fid->fid < 0) { | |
1049 | err = -ENOSPC; | |
1050 | goto error; | |
1051 | } | |
1052 | ||
1053 | memset(&fid->qid, 0, sizeof(struct p9_qid)); | |
1054 | fid->mode = -1; | |
1055 | fid->rdir_fpos = 0; | |
1056 | fid->rdir_pos = 0; | |
1057 | fid->rdir_fcall = NULL; | |
1058 | fid->uid = current->fsuid; | |
1059 | fid->clnt = clnt; | |
1060 | fid->aux = NULL; | |
1061 | ||
1062 | spin_lock(&clnt->lock); | |
1063 | list_add(&fid->flist, &clnt->fidlist); | |
1064 | spin_unlock(&clnt->lock); | |
1065 | ||
1066 | return fid; | |
1067 | ||
1068 | error: | |
1069 | kfree(fid); | |
1070 | return ERR_PTR(err); | |
1071 | } | |
1072 | ||
1073 | static void p9_fid_destroy(struct p9_fid *fid) | |
1074 | { | |
1075 | struct p9_client *clnt; | |
1076 | ||
1077 | P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid); | |
1078 | clnt = fid->clnt; | |
1079 | p9_idpool_put(fid->fid, clnt->fidpool); | |
1080 | spin_lock(&clnt->lock); | |
1081 | list_del(&fid->flist); | |
1082 | spin_unlock(&clnt->lock); | |
1083 | kfree(fid->rdir_fcall); | |
1084 | kfree(fid); | |
1085 | } |