Commit | Line | Data |
---|---|---|
bd238fb4 LI |
1 | /* |
2 | * net/9p/clnt.c | |
3 | * | |
4 | * 9P Client | |
5 | * | |
6 | * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 | |
10 | * as published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to: | |
19 | * Free Software Foundation | |
20 | * 51 Franklin Street, Fifth Floor | |
21 | * Boston, MA 02111-1301 USA | |
22 | * | |
23 | */ | |
24 | ||
25 | #include <linux/module.h> | |
26 | #include <linux/errno.h> | |
27 | #include <linux/fs.h> | |
28 | #include <linux/idr.h> | |
29 | #include <linux/mutex.h> | |
30 | #include <linux/sched.h> | |
31 | #include <linux/uaccess.h> | |
32 | #include <net/9p/9p.h> | |
fb0466c3 | 33 | #include <linux/parser.h> |
bd238fb4 LI |
34 | #include <net/9p/transport.h> |
35 | #include <net/9p/conn.h> | |
36 | #include <net/9p/client.h> | |
37 | ||
38 | static struct p9_fid *p9_fid_create(struct p9_client *clnt); | |
39 | static void p9_fid_destroy(struct p9_fid *fid); | |
40 | static struct p9_stat *p9_clone_stat(struct p9_stat *st, int dotu); | |
41 | ||
043aba40 EVH |
42 | /** |
43 | * p9_client_rpc - sends 9P request and waits until a response is available. | |
44 | * The function can be interrupted. | |
45 | * @c: client data | |
46 | * @tc: request to be sent | |
47 | * @rc: pointer where a pointer to the response is stored | |
48 | */ | |
49 | int | |
50 | p9_client_rpc(struct p9_client *c, struct p9_fcall *tc, | |
51 | struct p9_fcall **rc) | |
52 | { | |
53 | if (c->trans->rpc) | |
e2735b77 | 54 | return c->trans->rpc(c->trans, tc, rc, c->msize, c->dotu); |
043aba40 EVH |
55 | else |
56 | return p9_conn_rpc(c->conn, tc, rc); | |
57 | } | |
58 | ||
a80d923e | 59 | struct p9_client *p9_client_create(struct p9_trans *trans, int msize, |
bd238fb4 LI |
60 | int dotu) |
61 | { | |
62 | int err, n; | |
63 | struct p9_client *clnt; | |
64 | struct p9_fcall *tc, *rc; | |
65 | struct p9_str *version; | |
66 | ||
67 | err = 0; | |
68 | tc = NULL; | |
69 | rc = NULL; | |
70 | clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); | |
71 | if (!clnt) | |
72 | return ERR_PTR(-ENOMEM); | |
73 | ||
74 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p trans %p msize %d dotu %d\n", | |
75 | clnt, trans, msize, dotu); | |
76 | spin_lock_init(&clnt->lock); | |
77 | clnt->trans = trans; | |
78 | clnt->msize = msize; | |
79 | clnt->dotu = dotu; | |
80 | INIT_LIST_HEAD(&clnt->fidlist); | |
81 | clnt->fidpool = p9_idpool_create(); | |
82 | if (!clnt->fidpool) { | |
83 | err = PTR_ERR(clnt->fidpool); | |
84 | clnt->fidpool = NULL; | |
85 | goto error; | |
86 | } | |
87 | ||
88 | clnt->conn = p9_conn_create(clnt->trans, clnt->msize, &clnt->dotu); | |
89 | if (IS_ERR(clnt->conn)) { | |
90 | err = PTR_ERR(clnt->conn); | |
91 | clnt->conn = NULL; | |
92 | goto error; | |
93 | } | |
94 | ||
95 | tc = p9_create_tversion(clnt->msize, clnt->dotu?"9P2000.u":"9P2000"); | |
96 | if (IS_ERR(tc)) { | |
97 | err = PTR_ERR(tc); | |
98 | tc = NULL; | |
99 | goto error; | |
100 | } | |
101 | ||
e2735b77 | 102 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
103 | if (err) |
104 | goto error; | |
105 | ||
106 | version = &rc->params.rversion.version; | |
107 | if (version->len == 8 && !memcmp(version->str, "9P2000.u", 8)) | |
108 | clnt->dotu = 1; | |
109 | else if (version->len == 6 && !memcmp(version->str, "9P2000", 6)) | |
110 | clnt->dotu = 0; | |
111 | else { | |
112 | err = -EREMOTEIO; | |
113 | goto error; | |
114 | } | |
115 | ||
116 | n = rc->params.rversion.msize; | |
117 | if (n < clnt->msize) | |
118 | clnt->msize = n; | |
119 | ||
120 | kfree(tc); | |
121 | kfree(rc); | |
122 | return clnt; | |
123 | ||
124 | error: | |
125 | kfree(tc); | |
126 | kfree(rc); | |
127 | p9_client_destroy(clnt); | |
128 | return ERR_PTR(err); | |
129 | } | |
130 | EXPORT_SYMBOL(p9_client_create); | |
131 | ||
132 | void p9_client_destroy(struct p9_client *clnt) | |
133 | { | |
134 | struct p9_fid *fid, *fidptr; | |
135 | ||
136 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); | |
137 | if (clnt->conn) { | |
138 | p9_conn_destroy(clnt->conn); | |
139 | clnt->conn = NULL; | |
140 | } | |
141 | ||
142 | if (clnt->trans) { | |
143 | clnt->trans->close(clnt->trans); | |
144 | kfree(clnt->trans); | |
145 | clnt->trans = NULL; | |
146 | } | |
147 | ||
bd238fb4 LI |
148 | list_for_each_entry_safe(fid, fidptr, &clnt->fidlist, flist) |
149 | p9_fid_destroy(fid); | |
150 | ||
0af8887e EVH |
151 | if (clnt->fidpool) |
152 | p9_idpool_destroy(clnt->fidpool); | |
153 | ||
bd238fb4 LI |
154 | kfree(clnt); |
155 | } | |
156 | EXPORT_SYMBOL(p9_client_destroy); | |
157 | ||
158 | void p9_client_disconnect(struct p9_client *clnt) | |
159 | { | |
160 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); | |
161 | clnt->trans->status = Disconnected; | |
162 | p9_conn_cancel(clnt->conn, -EIO); | |
163 | } | |
164 | EXPORT_SYMBOL(p9_client_disconnect); | |
165 | ||
166 | struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, | |
ba17674f | 167 | char *uname, u32 n_uname, char *aname) |
bd238fb4 LI |
168 | { |
169 | int err; | |
170 | struct p9_fcall *tc, *rc; | |
171 | struct p9_fid *fid; | |
172 | ||
173 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p afid %d uname %s aname %s\n", | |
174 | clnt, afid?afid->fid:-1, uname, aname); | |
175 | err = 0; | |
176 | tc = NULL; | |
177 | rc = NULL; | |
178 | ||
179 | fid = p9_fid_create(clnt); | |
180 | if (IS_ERR(fid)) { | |
181 | err = PTR_ERR(fid); | |
182 | fid = NULL; | |
183 | goto error; | |
184 | } | |
185 | ||
ba17674f LI |
186 | tc = p9_create_tattach(fid->fid, afid?afid->fid:P9_NOFID, uname, aname, |
187 | n_uname, clnt->dotu); | |
bd238fb4 LI |
188 | if (IS_ERR(tc)) { |
189 | err = PTR_ERR(tc); | |
190 | tc = NULL; | |
191 | goto error; | |
192 | } | |
193 | ||
e2735b77 | 194 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
195 | if (err) |
196 | goto error; | |
197 | ||
198 | memmove(&fid->qid, &rc->params.rattach.qid, sizeof(struct p9_qid)); | |
199 | kfree(tc); | |
200 | kfree(rc); | |
201 | return fid; | |
202 | ||
203 | error: | |
204 | kfree(tc); | |
205 | kfree(rc); | |
206 | if (fid) | |
207 | p9_fid_destroy(fid); | |
208 | return ERR_PTR(err); | |
209 | } | |
210 | EXPORT_SYMBOL(p9_client_attach); | |
211 | ||
ba17674f LI |
212 | struct p9_fid *p9_client_auth(struct p9_client *clnt, char *uname, |
213 | u32 n_uname, char *aname) | |
bd238fb4 LI |
214 | { |
215 | int err; | |
216 | struct p9_fcall *tc, *rc; | |
217 | struct p9_fid *fid; | |
218 | ||
219 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p uname %s aname %s\n", clnt, uname, | |
220 | aname); | |
221 | err = 0; | |
222 | tc = NULL; | |
223 | rc = NULL; | |
224 | ||
225 | fid = p9_fid_create(clnt); | |
226 | if (IS_ERR(fid)) { | |
227 | err = PTR_ERR(fid); | |
228 | fid = NULL; | |
229 | goto error; | |
230 | } | |
231 | ||
ba17674f | 232 | tc = p9_create_tauth(fid->fid, uname, aname, n_uname, clnt->dotu); |
bd238fb4 LI |
233 | if (IS_ERR(tc)) { |
234 | err = PTR_ERR(tc); | |
235 | tc = NULL; | |
236 | goto error; | |
237 | } | |
238 | ||
e2735b77 | 239 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
240 | if (err) |
241 | goto error; | |
242 | ||
243 | memmove(&fid->qid, &rc->params.rauth.qid, sizeof(struct p9_qid)); | |
244 | kfree(tc); | |
245 | kfree(rc); | |
246 | return fid; | |
247 | ||
248 | error: | |
249 | kfree(tc); | |
250 | kfree(rc); | |
251 | if (fid) | |
252 | p9_fid_destroy(fid); | |
253 | return ERR_PTR(err); | |
254 | } | |
255 | EXPORT_SYMBOL(p9_client_auth); | |
256 | ||
257 | struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames, | |
258 | int clone) | |
259 | { | |
260 | int err; | |
261 | struct p9_fcall *tc, *rc; | |
262 | struct p9_client *clnt; | |
263 | struct p9_fid *fid; | |
264 | ||
265 | P9_DPRINTK(P9_DEBUG_9P, "fid %d nwname %d wname[0] %s\n", | |
266 | oldfid->fid, nwname, wnames?wnames[0]:NULL); | |
267 | err = 0; | |
268 | tc = NULL; | |
269 | rc = NULL; | |
270 | clnt = oldfid->clnt; | |
271 | if (clone) { | |
272 | fid = p9_fid_create(clnt); | |
273 | if (IS_ERR(fid)) { | |
274 | err = PTR_ERR(fid); | |
275 | fid = NULL; | |
276 | goto error; | |
277 | } | |
278 | ||
279 | fid->uid = oldfid->uid; | |
280 | } else | |
281 | fid = oldfid; | |
282 | ||
283 | tc = p9_create_twalk(oldfid->fid, fid->fid, nwname, wnames); | |
284 | if (IS_ERR(tc)) { | |
285 | err = PTR_ERR(tc); | |
286 | tc = NULL; | |
287 | goto error; | |
288 | } | |
289 | ||
e2735b77 | 290 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
291 | if (err) { |
292 | if (rc && rc->id == P9_RWALK) | |
293 | goto clunk_fid; | |
294 | else | |
295 | goto error; | |
296 | } | |
297 | ||
298 | if (rc->params.rwalk.nwqid != nwname) { | |
299 | err = -ENOENT; | |
300 | goto clunk_fid; | |
301 | } | |
302 | ||
303 | if (nwname) | |
304 | memmove(&fid->qid, | |
305 | &rc->params.rwalk.wqids[rc->params.rwalk.nwqid - 1], | |
306 | sizeof(struct p9_qid)); | |
307 | else | |
308 | fid->qid = oldfid->qid; | |
309 | ||
310 | kfree(tc); | |
311 | kfree(rc); | |
312 | return fid; | |
313 | ||
314 | clunk_fid: | |
315 | kfree(tc); | |
316 | kfree(rc); | |
317 | rc = NULL; | |
318 | tc = p9_create_tclunk(fid->fid); | |
319 | if (IS_ERR(tc)) { | |
320 | err = PTR_ERR(tc); | |
321 | tc = NULL; | |
322 | goto error; | |
323 | } | |
324 | ||
e2735b77 | 325 | p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
326 | |
327 | error: | |
328 | kfree(tc); | |
329 | kfree(rc); | |
330 | if (fid && (fid != oldfid)) | |
331 | p9_fid_destroy(fid); | |
332 | ||
333 | return ERR_PTR(err); | |
334 | } | |
335 | EXPORT_SYMBOL(p9_client_walk); | |
336 | ||
337 | int p9_client_open(struct p9_fid *fid, int mode) | |
338 | { | |
339 | int err; | |
340 | struct p9_fcall *tc, *rc; | |
341 | struct p9_client *clnt; | |
342 | ||
343 | P9_DPRINTK(P9_DEBUG_9P, "fid %d mode %d\n", fid->fid, mode); | |
344 | err = 0; | |
345 | tc = NULL; | |
346 | rc = NULL; | |
347 | clnt = fid->clnt; | |
348 | ||
349 | if (fid->mode != -1) | |
350 | return -EINVAL; | |
351 | ||
352 | tc = p9_create_topen(fid->fid, mode); | |
353 | if (IS_ERR(tc)) { | |
354 | err = PTR_ERR(tc); | |
355 | tc = NULL; | |
356 | goto done; | |
357 | } | |
358 | ||
e2735b77 | 359 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
360 | if (err) |
361 | goto done; | |
362 | ||
363 | fid->mode = mode; | |
364 | fid->iounit = rc->params.ropen.iounit; | |
365 | ||
366 | done: | |
367 | kfree(tc); | |
368 | kfree(rc); | |
369 | return err; | |
370 | } | |
371 | EXPORT_SYMBOL(p9_client_open); | |
372 | ||
373 | int p9_client_fcreate(struct p9_fid *fid, char *name, u32 perm, int mode, | |
374 | char *extension) | |
375 | { | |
376 | int err; | |
377 | struct p9_fcall *tc, *rc; | |
378 | struct p9_client *clnt; | |
379 | ||
380 | P9_DPRINTK(P9_DEBUG_9P, "fid %d name %s perm %d mode %d\n", fid->fid, | |
381 | name, perm, mode); | |
382 | err = 0; | |
383 | tc = NULL; | |
384 | rc = NULL; | |
385 | clnt = fid->clnt; | |
386 | ||
387 | if (fid->mode != -1) | |
388 | return -EINVAL; | |
389 | ||
390 | tc = p9_create_tcreate(fid->fid, name, perm, mode, extension, | |
391 | clnt->dotu); | |
392 | if (IS_ERR(tc)) { | |
393 | err = PTR_ERR(tc); | |
394 | tc = NULL; | |
395 | goto done; | |
396 | } | |
397 | ||
e2735b77 | 398 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
399 | if (err) |
400 | goto done; | |
401 | ||
402 | fid->mode = mode; | |
403 | fid->iounit = rc->params.ropen.iounit; | |
404 | ||
405 | done: | |
406 | kfree(tc); | |
407 | kfree(rc); | |
408 | return err; | |
409 | } | |
410 | EXPORT_SYMBOL(p9_client_fcreate); | |
411 | ||
412 | int p9_client_clunk(struct p9_fid *fid) | |
413 | { | |
414 | int err; | |
415 | struct p9_fcall *tc, *rc; | |
416 | struct p9_client *clnt; | |
417 | ||
418 | P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid); | |
419 | err = 0; | |
420 | tc = NULL; | |
421 | rc = NULL; | |
422 | clnt = fid->clnt; | |
423 | ||
424 | tc = p9_create_tclunk(fid->fid); | |
425 | if (IS_ERR(tc)) { | |
426 | err = PTR_ERR(tc); | |
427 | tc = NULL; | |
428 | goto done; | |
429 | } | |
430 | ||
e2735b77 | 431 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
432 | if (err) |
433 | goto done; | |
434 | ||
435 | p9_fid_destroy(fid); | |
436 | ||
437 | done: | |
438 | kfree(tc); | |
439 | kfree(rc); | |
440 | return err; | |
441 | } | |
442 | EXPORT_SYMBOL(p9_client_clunk); | |
443 | ||
444 | int p9_client_remove(struct p9_fid *fid) | |
445 | { | |
446 | int err; | |
447 | struct p9_fcall *tc, *rc; | |
448 | struct p9_client *clnt; | |
449 | ||
450 | P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid); | |
451 | err = 0; | |
452 | tc = NULL; | |
453 | rc = NULL; | |
454 | clnt = fid->clnt; | |
455 | ||
456 | tc = p9_create_tremove(fid->fid); | |
457 | if (IS_ERR(tc)) { | |
458 | err = PTR_ERR(tc); | |
459 | tc = NULL; | |
460 | goto done; | |
461 | } | |
462 | ||
e2735b77 | 463 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
464 | if (err) |
465 | goto done; | |
466 | ||
467 | p9_fid_destroy(fid); | |
468 | ||
469 | done: | |
470 | kfree(tc); | |
471 | kfree(rc); | |
472 | return err; | |
473 | } | |
474 | EXPORT_SYMBOL(p9_client_remove); | |
475 | ||
476 | int p9_client_read(struct p9_fid *fid, char *data, u64 offset, u32 count) | |
477 | { | |
478 | int err, n, rsize, total; | |
479 | struct p9_fcall *tc, *rc; | |
480 | struct p9_client *clnt; | |
481 | ||
482 | P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu %d\n", fid->fid, | |
483 | (long long unsigned) offset, count); | |
484 | err = 0; | |
485 | tc = NULL; | |
486 | rc = NULL; | |
487 | clnt = fid->clnt; | |
488 | total = 0; | |
489 | ||
490 | rsize = fid->iounit; | |
491 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) | |
492 | rsize = clnt->msize - P9_IOHDRSZ; | |
493 | ||
494 | do { | |
495 | if (count < rsize) | |
496 | rsize = count; | |
497 | ||
498 | tc = p9_create_tread(fid->fid, offset, rsize); | |
499 | if (IS_ERR(tc)) { | |
500 | err = PTR_ERR(tc); | |
501 | tc = NULL; | |
502 | goto error; | |
503 | } | |
504 | ||
e2735b77 | 505 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
506 | if (err) |
507 | goto error; | |
508 | ||
509 | n = rc->params.rread.count; | |
510 | if (n > count) | |
511 | n = count; | |
512 | ||
513 | memmove(data, rc->params.rread.data, n); | |
514 | count -= n; | |
515 | data += n; | |
516 | offset += n; | |
517 | total += n; | |
518 | kfree(tc); | |
519 | tc = NULL; | |
520 | kfree(rc); | |
521 | rc = NULL; | |
522 | } while (count > 0 && n == rsize); | |
523 | ||
524 | return total; | |
525 | ||
526 | error: | |
527 | kfree(tc); | |
528 | kfree(rc); | |
529 | return err; | |
530 | } | |
531 | EXPORT_SYMBOL(p9_client_read); | |
532 | ||
533 | int p9_client_write(struct p9_fid *fid, char *data, u64 offset, u32 count) | |
534 | { | |
535 | int err, n, rsize, total; | |
536 | struct p9_fcall *tc, *rc; | |
537 | struct p9_client *clnt; | |
538 | ||
539 | P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid, | |
540 | (long long unsigned) offset, count); | |
541 | err = 0; | |
542 | tc = NULL; | |
543 | rc = NULL; | |
544 | clnt = fid->clnt; | |
545 | total = 0; | |
546 | ||
547 | rsize = fid->iounit; | |
548 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) | |
549 | rsize = clnt->msize - P9_IOHDRSZ; | |
550 | ||
551 | do { | |
552 | if (count < rsize) | |
553 | rsize = count; | |
554 | ||
555 | tc = p9_create_twrite(fid->fid, offset, rsize, data); | |
556 | if (IS_ERR(tc)) { | |
557 | err = PTR_ERR(tc); | |
558 | tc = NULL; | |
559 | goto error; | |
560 | } | |
561 | ||
e2735b77 | 562 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
563 | if (err) |
564 | goto error; | |
565 | ||
566 | n = rc->params.rread.count; | |
567 | count -= n; | |
568 | data += n; | |
569 | offset += n; | |
570 | total += n; | |
571 | kfree(tc); | |
572 | tc = NULL; | |
573 | kfree(rc); | |
574 | rc = NULL; | |
575 | } while (count > 0); | |
576 | ||
577 | return total; | |
578 | ||
579 | error: | |
580 | kfree(tc); | |
581 | kfree(rc); | |
582 | return err; | |
583 | } | |
584 | EXPORT_SYMBOL(p9_client_write); | |
585 | ||
586 | int | |
587 | p9_client_uread(struct p9_fid *fid, char __user *data, u64 offset, u32 count) | |
588 | { | |
589 | int err, n, rsize, total; | |
590 | struct p9_fcall *tc, *rc; | |
591 | struct p9_client *clnt; | |
592 | ||
593 | P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid, | |
594 | (long long unsigned) offset, count); | |
595 | err = 0; | |
596 | tc = NULL; | |
597 | rc = NULL; | |
598 | clnt = fid->clnt; | |
599 | total = 0; | |
600 | ||
601 | rsize = fid->iounit; | |
602 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) | |
603 | rsize = clnt->msize - P9_IOHDRSZ; | |
604 | ||
605 | do { | |
606 | if (count < rsize) | |
607 | rsize = count; | |
608 | ||
609 | tc = p9_create_tread(fid->fid, offset, rsize); | |
610 | if (IS_ERR(tc)) { | |
611 | err = PTR_ERR(tc); | |
612 | tc = NULL; | |
613 | goto error; | |
614 | } | |
615 | ||
e2735b77 | 616 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
617 | if (err) |
618 | goto error; | |
619 | ||
620 | n = rc->params.rread.count; | |
621 | if (n > count) | |
622 | n = count; | |
623 | ||
624 | err = copy_to_user(data, rc->params.rread.data, n); | |
625 | if (err) { | |
626 | err = -EFAULT; | |
627 | goto error; | |
628 | } | |
629 | ||
630 | count -= n; | |
631 | data += n; | |
632 | offset += n; | |
633 | total += n; | |
634 | kfree(tc); | |
635 | tc = NULL; | |
636 | kfree(rc); | |
637 | rc = NULL; | |
638 | } while (count > 0 && n == rsize); | |
639 | ||
640 | return total; | |
641 | ||
642 | error: | |
643 | kfree(tc); | |
644 | kfree(rc); | |
645 | return err; | |
646 | } | |
647 | EXPORT_SYMBOL(p9_client_uread); | |
648 | ||
649 | int | |
650 | p9_client_uwrite(struct p9_fid *fid, const char __user *data, u64 offset, | |
651 | u32 count) | |
652 | { | |
653 | int err, n, rsize, total; | |
654 | struct p9_fcall *tc, *rc; | |
655 | struct p9_client *clnt; | |
656 | ||
657 | P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid, | |
658 | (long long unsigned) offset, count); | |
659 | err = 0; | |
660 | tc = NULL; | |
661 | rc = NULL; | |
662 | clnt = fid->clnt; | |
663 | total = 0; | |
664 | ||
665 | rsize = fid->iounit; | |
666 | if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) | |
667 | rsize = clnt->msize - P9_IOHDRSZ; | |
668 | ||
669 | do { | |
670 | if (count < rsize) | |
671 | rsize = count; | |
672 | ||
673 | tc = p9_create_twrite_u(fid->fid, offset, rsize, data); | |
674 | if (IS_ERR(tc)) { | |
675 | err = PTR_ERR(tc); | |
676 | tc = NULL; | |
677 | goto error; | |
678 | } | |
679 | ||
e2735b77 | 680 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
681 | if (err) |
682 | goto error; | |
683 | ||
684 | n = rc->params.rread.count; | |
685 | count -= n; | |
686 | data += n; | |
687 | offset += n; | |
688 | total += n; | |
689 | kfree(tc); | |
690 | tc = NULL; | |
691 | kfree(rc); | |
692 | rc = NULL; | |
693 | } while (count > 0); | |
694 | ||
695 | return total; | |
696 | ||
697 | error: | |
698 | kfree(tc); | |
699 | kfree(rc); | |
700 | return err; | |
701 | } | |
702 | EXPORT_SYMBOL(p9_client_uwrite); | |
703 | ||
704 | int p9_client_readn(struct p9_fid *fid, char *data, u64 offset, u32 count) | |
705 | { | |
706 | int n, total; | |
707 | ||
708 | P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu count %d\n", fid->fid, | |
709 | (long long unsigned) offset, count); | |
710 | n = 0; | |
711 | total = 0; | |
712 | while (count) { | |
713 | n = p9_client_read(fid, data, offset, count); | |
714 | if (n <= 0) | |
715 | break; | |
716 | ||
717 | data += n; | |
718 | offset += n; | |
719 | count -= n; | |
720 | total += n; | |
721 | } | |
722 | ||
723 | if (n < 0) | |
724 | total = n; | |
725 | ||
726 | return total; | |
727 | } | |
728 | EXPORT_SYMBOL(p9_client_readn); | |
729 | ||
730 | struct p9_stat *p9_client_stat(struct p9_fid *fid) | |
731 | { | |
732 | int err; | |
733 | struct p9_fcall *tc, *rc; | |
734 | struct p9_client *clnt; | |
735 | struct p9_stat *ret; | |
736 | ||
737 | P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid); | |
738 | err = 0; | |
739 | tc = NULL; | |
740 | rc = NULL; | |
741 | ret = NULL; | |
742 | clnt = fid->clnt; | |
743 | ||
744 | tc = p9_create_tstat(fid->fid); | |
745 | if (IS_ERR(tc)) { | |
746 | err = PTR_ERR(tc); | |
747 | tc = NULL; | |
748 | goto error; | |
749 | } | |
750 | ||
e2735b77 | 751 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
752 | if (err) |
753 | goto error; | |
754 | ||
755 | ret = p9_clone_stat(&rc->params.rstat.stat, clnt->dotu); | |
756 | if (IS_ERR(ret)) { | |
757 | err = PTR_ERR(ret); | |
758 | ret = NULL; | |
759 | goto error; | |
760 | } | |
761 | ||
762 | kfree(tc); | |
763 | kfree(rc); | |
764 | return ret; | |
765 | ||
766 | error: | |
767 | kfree(tc); | |
768 | kfree(rc); | |
769 | kfree(ret); | |
770 | return ERR_PTR(err); | |
771 | } | |
772 | EXPORT_SYMBOL(p9_client_stat); | |
773 | ||
774 | int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) | |
775 | { | |
776 | int err; | |
777 | struct p9_fcall *tc, *rc; | |
778 | struct p9_client *clnt; | |
779 | ||
780 | P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid); | |
781 | err = 0; | |
782 | tc = NULL; | |
783 | rc = NULL; | |
784 | clnt = fid->clnt; | |
785 | ||
786 | tc = p9_create_twstat(fid->fid, wst, clnt->dotu); | |
787 | if (IS_ERR(tc)) { | |
788 | err = PTR_ERR(tc); | |
789 | tc = NULL; | |
790 | goto done; | |
791 | } | |
792 | ||
e2735b77 | 793 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
794 | |
795 | done: | |
796 | kfree(tc); | |
797 | kfree(rc); | |
798 | return err; | |
799 | } | |
800 | EXPORT_SYMBOL(p9_client_wstat); | |
801 | ||
802 | struct p9_stat *p9_client_dirread(struct p9_fid *fid, u64 offset) | |
803 | { | |
804 | int err, n, m; | |
805 | struct p9_fcall *tc, *rc; | |
806 | struct p9_client *clnt; | |
807 | struct p9_stat st, *ret; | |
808 | ||
809 | P9_DPRINTK(P9_DEBUG_9P, "fid %d offset %llu\n", fid->fid, | |
810 | (long long unsigned) offset); | |
811 | err = 0; | |
812 | tc = NULL; | |
813 | rc = NULL; | |
814 | ret = NULL; | |
815 | clnt = fid->clnt; | |
816 | ||
817 | /* if the offset is below or above the current response, free it */ | |
818 | if (offset < fid->rdir_fpos || (fid->rdir_fcall && | |
819 | offset >= fid->rdir_fpos+fid->rdir_fcall->params.rread.count)) { | |
820 | fid->rdir_pos = 0; | |
821 | if (fid->rdir_fcall) | |
822 | fid->rdir_fpos += fid->rdir_fcall->params.rread.count; | |
823 | ||
824 | kfree(fid->rdir_fcall); | |
825 | fid->rdir_fcall = NULL; | |
826 | if (offset < fid->rdir_fpos) | |
827 | fid->rdir_fpos = 0; | |
828 | } | |
829 | ||
830 | if (!fid->rdir_fcall) { | |
831 | n = fid->iounit; | |
832 | if (!n || n > clnt->msize-P9_IOHDRSZ) | |
833 | n = clnt->msize - P9_IOHDRSZ; | |
834 | ||
835 | while (1) { | |
836 | if (fid->rdir_fcall) { | |
837 | fid->rdir_fpos += | |
838 | fid->rdir_fcall->params.rread.count; | |
839 | kfree(fid->rdir_fcall); | |
840 | fid->rdir_fcall = NULL; | |
841 | } | |
842 | ||
843 | tc = p9_create_tread(fid->fid, fid->rdir_fpos, n); | |
844 | if (IS_ERR(tc)) { | |
845 | err = PTR_ERR(tc); | |
846 | tc = NULL; | |
847 | goto error; | |
848 | } | |
849 | ||
e2735b77 | 850 | err = p9_client_rpc(clnt, tc, &rc); |
bd238fb4 LI |
851 | if (err) |
852 | goto error; | |
853 | ||
854 | n = rc->params.rread.count; | |
855 | if (n == 0) | |
856 | goto done; | |
857 | ||
858 | fid->rdir_fcall = rc; | |
859 | rc = NULL; | |
860 | if (offset >= fid->rdir_fpos && | |
861 | offset < fid->rdir_fpos+n) | |
862 | break; | |
863 | } | |
864 | ||
865 | fid->rdir_pos = 0; | |
866 | } | |
867 | ||
868 | m = offset - fid->rdir_fpos; | |
869 | if (m < 0) | |
870 | goto done; | |
871 | ||
872 | n = p9_deserialize_stat(fid->rdir_fcall->params.rread.data + m, | |
873 | fid->rdir_fcall->params.rread.count - m, &st, clnt->dotu); | |
874 | ||
875 | if (!n) { | |
876 | err = -EIO; | |
877 | goto error; | |
878 | } | |
879 | ||
880 | fid->rdir_pos += n; | |
881 | st.size = n; | |
882 | ret = p9_clone_stat(&st, clnt->dotu); | |
883 | if (IS_ERR(ret)) { | |
884 | err = PTR_ERR(ret); | |
885 | ret = NULL; | |
886 | goto error; | |
887 | } | |
888 | ||
889 | done: | |
890 | kfree(tc); | |
891 | kfree(rc); | |
892 | return ret; | |
893 | ||
894 | error: | |
895 | kfree(tc); | |
896 | kfree(rc); | |
897 | kfree(ret); | |
898 | return ERR_PTR(err); | |
899 | } | |
900 | EXPORT_SYMBOL(p9_client_dirread); | |
901 | ||
902 | static struct p9_stat *p9_clone_stat(struct p9_stat *st, int dotu) | |
903 | { | |
904 | int n; | |
905 | char *p; | |
906 | struct p9_stat *ret; | |
907 | ||
908 | n = sizeof(struct p9_stat) + st->name.len + st->uid.len + st->gid.len + | |
909 | st->muid.len; | |
910 | ||
911 | if (dotu) | |
912 | n += st->extension.len; | |
913 | ||
914 | ret = kmalloc(n, GFP_KERNEL); | |
915 | if (!ret) | |
916 | return ERR_PTR(-ENOMEM); | |
917 | ||
918 | memmove(ret, st, sizeof(struct p9_stat)); | |
919 | p = ((char *) ret) + sizeof(struct p9_stat); | |
920 | memmove(p, st->name.str, st->name.len); | |
afcf0c13 | 921 | ret->name.str = p; |
bd238fb4 LI |
922 | p += st->name.len; |
923 | memmove(p, st->uid.str, st->uid.len); | |
afcf0c13 | 924 | ret->uid.str = p; |
bd238fb4 LI |
925 | p += st->uid.len; |
926 | memmove(p, st->gid.str, st->gid.len); | |
afcf0c13 | 927 | ret->gid.str = p; |
bd238fb4 LI |
928 | p += st->gid.len; |
929 | memmove(p, st->muid.str, st->muid.len); | |
afcf0c13 | 930 | ret->muid.str = p; |
bd238fb4 LI |
931 | p += st->muid.len; |
932 | ||
933 | if (dotu) { | |
934 | memmove(p, st->extension.str, st->extension.len); | |
afcf0c13 | 935 | ret->extension.str = p; |
bd238fb4 LI |
936 | p += st->extension.len; |
937 | } | |
938 | ||
939 | return ret; | |
940 | } | |
941 | ||
942 | static struct p9_fid *p9_fid_create(struct p9_client *clnt) | |
943 | { | |
944 | int err; | |
945 | struct p9_fid *fid; | |
946 | ||
947 | P9_DPRINTK(P9_DEBUG_9P, "clnt %p\n", clnt); | |
948 | fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); | |
949 | if (!fid) | |
950 | return ERR_PTR(-ENOMEM); | |
951 | ||
952 | fid->fid = p9_idpool_get(clnt->fidpool); | |
953 | if (fid->fid < 0) { | |
954 | err = -ENOSPC; | |
955 | goto error; | |
956 | } | |
957 | ||
958 | memset(&fid->qid, 0, sizeof(struct p9_qid)); | |
959 | fid->mode = -1; | |
960 | fid->rdir_fpos = 0; | |
961 | fid->rdir_pos = 0; | |
962 | fid->rdir_fcall = NULL; | |
963 | fid->uid = current->fsuid; | |
964 | fid->clnt = clnt; | |
965 | fid->aux = NULL; | |
966 | ||
967 | spin_lock(&clnt->lock); | |
968 | list_add(&fid->flist, &clnt->fidlist); | |
969 | spin_unlock(&clnt->lock); | |
970 | ||
971 | return fid; | |
972 | ||
973 | error: | |
974 | kfree(fid); | |
975 | return ERR_PTR(err); | |
976 | } | |
977 | ||
978 | static void p9_fid_destroy(struct p9_fid *fid) | |
979 | { | |
980 | struct p9_client *clnt; | |
981 | ||
982 | P9_DPRINTK(P9_DEBUG_9P, "fid %d\n", fid->fid); | |
983 | clnt = fid->clnt; | |
984 | p9_idpool_put(fid->fid, clnt->fidpool); | |
985 | spin_lock(&clnt->lock); | |
986 | list_del(&fid->flist); | |
987 | spin_unlock(&clnt->lock); | |
988 | kfree(fid->rdir_fcall); | |
989 | kfree(fid); | |
990 | } |