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