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Commit | Line | Data |
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ace51c4d EVH |
1 | /* |
2 | * net/9p/protocol.c | |
3 | * | |
4 | * 9P Protocol Support Code | |
5 | * | |
6 | * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com> | |
7 | * | |
8 | * Base on code from Anthony Liguori <aliguori@us.ibm.com> | |
9 | * Copyright (C) 2008 by IBM, Corp. | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or modify | |
12 | * it under the terms of the GNU General Public License version 2 | |
13 | * as published by the Free Software Foundation. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to: | |
22 | * Free Software Foundation | |
23 | * 51 Franklin Street, Fifth Floor | |
24 | * Boston, MA 02111-1301 USA | |
25 | * | |
26 | */ | |
27 | ||
28 | #include <linux/module.h> | |
29 | #include <linux/errno.h> | |
51a87c55 | 30 | #include <linux/uaccess.h> |
5a0e3ad6 | 31 | #include <linux/slab.h> |
e7f4b8f1 | 32 | #include <linux/sched.h> |
beeebc92 | 33 | #include <linux/types.h> |
ace51c4d EVH |
34 | #include <net/9p/9p.h> |
35 | #include <net/9p/client.h> | |
36 | #include "protocol.h" | |
37 | ||
38 | #ifndef MIN | |
39 | #define MIN(a, b) (((a) < (b)) ? (a) : (b)) | |
40 | #endif | |
41 | ||
42 | #ifndef MAX | |
43 | #define MAX(a, b) (((a) > (b)) ? (a) : (b)) | |
44 | #endif | |
45 | ||
46 | #ifndef offset_of | |
47 | #define offset_of(type, memb) \ | |
48 | ((unsigned long)(&((type *)0)->memb)) | |
49 | #endif | |
50 | #ifndef container_of | |
51 | #define container_of(obj, type, memb) \ | |
52 | ((type *)(((char *)obj) - offset_of(type, memb))) | |
53 | #endif | |
54 | ||
55 | static int | |
342fee1d | 56 | p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...); |
ace51c4d | 57 | |
0b15a3a5 | 58 | #ifdef CONFIG_NET_9P_DEBUG |
51a87c55 EVH |
59 | void |
60 | p9pdu_dump(int way, struct p9_fcall *pdu) | |
61 | { | |
62 | int i, n; | |
63 | u8 *data = pdu->sdata; | |
64 | int datalen = pdu->size; | |
65 | char buf[255]; | |
66 | int buflen = 255; | |
67 | ||
68 | i = n = 0; | |
69 | if (datalen > (buflen-16)) | |
70 | datalen = buflen-16; | |
71 | while (i < datalen) { | |
72 | n += scnprintf(buf + n, buflen - n, "%02x ", data[i]); | |
73 | if (i%4 == 3) | |
74 | n += scnprintf(buf + n, buflen - n, " "); | |
75 | if (i%32 == 31) | |
76 | n += scnprintf(buf + n, buflen - n, "\n"); | |
77 | ||
78 | i++; | |
79 | } | |
80 | n += scnprintf(buf + n, buflen - n, "\n"); | |
81 | ||
82 | if (way) | |
e7f4b8f1 | 83 | P9_DPRINTK(P9_DEBUG_PKT, "[[[(%d) %s\n", datalen, buf); |
51a87c55 | 84 | else |
e7f4b8f1 | 85 | P9_DPRINTK(P9_DEBUG_PKT, "]]](%d) %s\n", datalen, buf); |
51a87c55 | 86 | } |
0b15a3a5 EVH |
87 | #else |
88 | void | |
89 | p9pdu_dump(int way, struct p9_fcall *pdu) | |
90 | { | |
91 | } | |
92 | #endif | |
51a87c55 EVH |
93 | EXPORT_SYMBOL(p9pdu_dump); |
94 | ||
ace51c4d EVH |
95 | void p9stat_free(struct p9_wstat *stbuf) |
96 | { | |
97 | kfree(stbuf->name); | |
98 | kfree(stbuf->uid); | |
99 | kfree(stbuf->gid); | |
100 | kfree(stbuf->muid); | |
101 | kfree(stbuf->extension); | |
102 | } | |
103 | EXPORT_SYMBOL(p9stat_free); | |
104 | ||
105 | static size_t pdu_read(struct p9_fcall *pdu, void *data, size_t size) | |
106 | { | |
107 | size_t len = MIN(pdu->size - pdu->offset, size); | |
108 | memcpy(data, &pdu->sdata[pdu->offset], len); | |
109 | pdu->offset += len; | |
110 | return size - len; | |
111 | } | |
112 | ||
113 | static size_t pdu_write(struct p9_fcall *pdu, const void *data, size_t size) | |
114 | { | |
115 | size_t len = MIN(pdu->capacity - pdu->size, size); | |
116 | memcpy(&pdu->sdata[pdu->size], data, len); | |
117 | pdu->size += len; | |
118 | return size - len; | |
119 | } | |
120 | ||
51a87c55 EVH |
121 | static size_t |
122 | pdu_write_u(struct p9_fcall *pdu, const char __user *udata, size_t size) | |
123 | { | |
124 | size_t len = MIN(pdu->capacity - pdu->size, size); | |
7b3bb3fe AK |
125 | if (copy_from_user(&pdu->sdata[pdu->size], udata, len)) |
126 | len = 0; | |
51a87c55 EVH |
127 | |
128 | pdu->size += len; | |
129 | return size - len; | |
130 | } | |
131 | ||
ace51c4d EVH |
132 | /* |
133 | b - int8_t | |
134 | w - int16_t | |
135 | d - int32_t | |
136 | q - int64_t | |
137 | s - string | |
138 | S - stat | |
139 | Q - qid | |
140 | D - data blob (int32_t size followed by void *, results are not freed) | |
141 | T - array of strings (int16_t count, followed by strings) | |
142 | R - array of qids (int16_t count, followed by qids) | |
f0853122 | 143 | A - stat for 9p2000.L (p9_stat_dotl) |
ace51c4d EVH |
144 | ? - if optional = 1, continue parsing |
145 | */ | |
146 | ||
147 | static int | |
342fee1d SK |
148 | p9pdu_vreadf(struct p9_fcall *pdu, int proto_version, const char *fmt, |
149 | va_list ap) | |
ace51c4d EVH |
150 | { |
151 | const char *ptr; | |
152 | int errcode = 0; | |
153 | ||
154 | for (ptr = fmt; *ptr; ptr++) { | |
155 | switch (*ptr) { | |
156 | case 'b':{ | |
157 | int8_t *val = va_arg(ap, int8_t *); | |
158 | if (pdu_read(pdu, val, sizeof(*val))) { | |
159 | errcode = -EFAULT; | |
160 | break; | |
161 | } | |
162 | } | |
163 | break; | |
164 | case 'w':{ | |
165 | int16_t *val = va_arg(ap, int16_t *); | |
beeebc92 EVH |
166 | __le16 le_val; |
167 | if (pdu_read(pdu, &le_val, sizeof(le_val))) { | |
ace51c4d EVH |
168 | errcode = -EFAULT; |
169 | break; | |
170 | } | |
beeebc92 | 171 | *val = le16_to_cpu(le_val); |
ace51c4d EVH |
172 | } |
173 | break; | |
174 | case 'd':{ | |
175 | int32_t *val = va_arg(ap, int32_t *); | |
beeebc92 EVH |
176 | __le32 le_val; |
177 | if (pdu_read(pdu, &le_val, sizeof(le_val))) { | |
ace51c4d EVH |
178 | errcode = -EFAULT; |
179 | break; | |
180 | } | |
beeebc92 | 181 | *val = le32_to_cpu(le_val); |
ace51c4d EVH |
182 | } |
183 | break; | |
184 | case 'q':{ | |
185 | int64_t *val = va_arg(ap, int64_t *); | |
beeebc92 EVH |
186 | __le64 le_val; |
187 | if (pdu_read(pdu, &le_val, sizeof(le_val))) { | |
ace51c4d EVH |
188 | errcode = -EFAULT; |
189 | break; | |
190 | } | |
beeebc92 | 191 | *val = le64_to_cpu(le_val); |
ace51c4d EVH |
192 | } |
193 | break; | |
194 | case 's':{ | |
e45c5405 | 195 | char **sptr = va_arg(ap, char **); |
ace51c4d EVH |
196 | int16_t len; |
197 | int size; | |
198 | ||
342fee1d SK |
199 | errcode = p9pdu_readf(pdu, proto_version, |
200 | "w", &len); | |
ace51c4d EVH |
201 | if (errcode) |
202 | break; | |
203 | ||
204 | size = MAX(len, 0); | |
205 | ||
e45c5405 EVH |
206 | *sptr = kmalloc(size + 1, GFP_KERNEL); |
207 | if (*sptr == NULL) { | |
ace51c4d EVH |
208 | errcode = -EFAULT; |
209 | break; | |
210 | } | |
e45c5405 | 211 | if (pdu_read(pdu, *sptr, size)) { |
ace51c4d | 212 | errcode = -EFAULT; |
e45c5405 EVH |
213 | kfree(*sptr); |
214 | *sptr = NULL; | |
ace51c4d | 215 | } else |
e45c5405 | 216 | (*sptr)[size] = 0; |
ace51c4d EVH |
217 | } |
218 | break; | |
219 | case 'Q':{ | |
220 | struct p9_qid *qid = | |
221 | va_arg(ap, struct p9_qid *); | |
222 | ||
342fee1d | 223 | errcode = p9pdu_readf(pdu, proto_version, "bdq", |
ace51c4d EVH |
224 | &qid->type, &qid->version, |
225 | &qid->path); | |
226 | } | |
227 | break; | |
228 | case 'S':{ | |
229 | struct p9_wstat *stbuf = | |
230 | va_arg(ap, struct p9_wstat *); | |
231 | ||
f0a0ac2e | 232 | memset(stbuf, 0, sizeof(struct p9_wstat)); |
ace51c4d | 233 | stbuf->n_uid = stbuf->n_gid = stbuf->n_muid = |
f0a0ac2e | 234 | -1; |
ace51c4d | 235 | errcode = |
342fee1d | 236 | p9pdu_readf(pdu, proto_version, |
ace51c4d EVH |
237 | "wwdQdddqssss?sddd", |
238 | &stbuf->size, &stbuf->type, | |
239 | &stbuf->dev, &stbuf->qid, | |
240 | &stbuf->mode, &stbuf->atime, | |
241 | &stbuf->mtime, &stbuf->length, | |
242 | &stbuf->name, &stbuf->uid, | |
243 | &stbuf->gid, &stbuf->muid, | |
244 | &stbuf->extension, | |
245 | &stbuf->n_uid, &stbuf->n_gid, | |
246 | &stbuf->n_muid); | |
247 | if (errcode) | |
248 | p9stat_free(stbuf); | |
249 | } | |
250 | break; | |
251 | case 'D':{ | |
252 | int32_t *count = va_arg(ap, int32_t *); | |
253 | void **data = va_arg(ap, void **); | |
254 | ||
255 | errcode = | |
342fee1d | 256 | p9pdu_readf(pdu, proto_version, "d", count); |
ace51c4d EVH |
257 | if (!errcode) { |
258 | *count = | |
259 | MIN(*count, | |
260 | pdu->size - pdu->offset); | |
261 | *data = &pdu->sdata[pdu->offset]; | |
262 | } | |
263 | } | |
264 | break; | |
265 | case 'T':{ | |
266 | int16_t *nwname = va_arg(ap, int16_t *); | |
267 | char ***wnames = va_arg(ap, char ***); | |
268 | ||
342fee1d SK |
269 | errcode = p9pdu_readf(pdu, proto_version, |
270 | "w", nwname); | |
ace51c4d EVH |
271 | if (!errcode) { |
272 | *wnames = | |
273 | kmalloc(sizeof(char *) * *nwname, | |
274 | GFP_KERNEL); | |
275 | if (!*wnames) | |
276 | errcode = -ENOMEM; | |
277 | } | |
278 | ||
279 | if (!errcode) { | |
280 | int i; | |
281 | ||
282 | for (i = 0; i < *nwname; i++) { | |
283 | errcode = | |
342fee1d SK |
284 | p9pdu_readf(pdu, |
285 | proto_version, | |
ace51c4d EVH |
286 | "s", |
287 | &(*wnames)[i]); | |
288 | if (errcode) | |
289 | break; | |
290 | } | |
291 | } | |
292 | ||
293 | if (errcode) { | |
294 | if (*wnames) { | |
295 | int i; | |
296 | ||
297 | for (i = 0; i < *nwname; i++) | |
298 | kfree((*wnames)[i]); | |
299 | } | |
300 | kfree(*wnames); | |
301 | *wnames = NULL; | |
302 | } | |
303 | } | |
304 | break; | |
305 | case 'R':{ | |
306 | int16_t *nwqid = va_arg(ap, int16_t *); | |
307 | struct p9_qid **wqids = | |
308 | va_arg(ap, struct p9_qid **); | |
309 | ||
310 | *wqids = NULL; | |
311 | ||
312 | errcode = | |
342fee1d | 313 | p9pdu_readf(pdu, proto_version, "w", nwqid); |
ace51c4d EVH |
314 | if (!errcode) { |
315 | *wqids = | |
316 | kmalloc(*nwqid * | |
317 | sizeof(struct p9_qid), | |
318 | GFP_KERNEL); | |
319 | if (*wqids == NULL) | |
320 | errcode = -ENOMEM; | |
321 | } | |
322 | ||
323 | if (!errcode) { | |
324 | int i; | |
325 | ||
326 | for (i = 0; i < *nwqid; i++) { | |
327 | errcode = | |
342fee1d SK |
328 | p9pdu_readf(pdu, |
329 | proto_version, | |
ace51c4d EVH |
330 | "Q", |
331 | &(*wqids)[i]); | |
332 | if (errcode) | |
333 | break; | |
334 | } | |
335 | } | |
336 | ||
337 | if (errcode) { | |
338 | kfree(*wqids); | |
339 | *wqids = NULL; | |
340 | } | |
341 | } | |
342 | break; | |
f0853122 SK |
343 | case 'A': { |
344 | struct p9_stat_dotl *stbuf = | |
345 | va_arg(ap, struct p9_stat_dotl *); | |
346 | ||
347 | memset(stbuf, 0, sizeof(struct p9_stat_dotl)); | |
348 | errcode = | |
349 | p9pdu_readf(pdu, proto_version, | |
350 | "qQdddqqqqqqqqqqqqqqq", | |
351 | &stbuf->st_result_mask, | |
352 | &stbuf->qid, | |
353 | &stbuf->st_mode, | |
354 | &stbuf->st_uid, &stbuf->st_gid, | |
355 | &stbuf->st_nlink, | |
356 | &stbuf->st_rdev, &stbuf->st_size, | |
357 | &stbuf->st_blksize, &stbuf->st_blocks, | |
358 | &stbuf->st_atime_sec, | |
359 | &stbuf->st_atime_nsec, | |
360 | &stbuf->st_mtime_sec, | |
361 | &stbuf->st_mtime_nsec, | |
362 | &stbuf->st_ctime_sec, | |
363 | &stbuf->st_ctime_nsec, | |
364 | &stbuf->st_btime_sec, | |
365 | &stbuf->st_btime_nsec, | |
366 | &stbuf->st_gen, | |
367 | &stbuf->st_data_version); | |
368 | } | |
369 | break; | |
ace51c4d | 370 | case '?': |
c56e4acf SK |
371 | if ((proto_version != p9_proto_2000u) && |
372 | (proto_version != p9_proto_2000L)) | |
ace51c4d EVH |
373 | return 0; |
374 | break; | |
375 | default: | |
376 | BUG(); | |
377 | break; | |
378 | } | |
379 | ||
380 | if (errcode) | |
381 | break; | |
382 | } | |
383 | ||
384 | return errcode; | |
385 | } | |
386 | ||
387 | int | |
342fee1d SK |
388 | p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt, |
389 | va_list ap) | |
ace51c4d EVH |
390 | { |
391 | const char *ptr; | |
392 | int errcode = 0; | |
393 | ||
394 | for (ptr = fmt; *ptr; ptr++) { | |
395 | switch (*ptr) { | |
396 | case 'b':{ | |
397 | int8_t val = va_arg(ap, int); | |
398 | if (pdu_write(pdu, &val, sizeof(val))) | |
399 | errcode = -EFAULT; | |
400 | } | |
401 | break; | |
402 | case 'w':{ | |
beeebc92 | 403 | __le16 val = cpu_to_le16(va_arg(ap, int)); |
ace51c4d EVH |
404 | if (pdu_write(pdu, &val, sizeof(val))) |
405 | errcode = -EFAULT; | |
406 | } | |
407 | break; | |
408 | case 'd':{ | |
beeebc92 | 409 | __le32 val = cpu_to_le32(va_arg(ap, int32_t)); |
ace51c4d EVH |
410 | if (pdu_write(pdu, &val, sizeof(val))) |
411 | errcode = -EFAULT; | |
412 | } | |
413 | break; | |
414 | case 'q':{ | |
beeebc92 | 415 | __le64 val = cpu_to_le64(va_arg(ap, int64_t)); |
ace51c4d EVH |
416 | if (pdu_write(pdu, &val, sizeof(val))) |
417 | errcode = -EFAULT; | |
418 | } | |
419 | break; | |
420 | case 's':{ | |
e45c5405 | 421 | const char *sptr = va_arg(ap, const char *); |
ace51c4d | 422 | int16_t len = 0; |
e45c5405 | 423 | if (sptr) |
4be929be | 424 | len = MIN(strlen(sptr), USHRT_MAX); |
ace51c4d | 425 | |
342fee1d SK |
426 | errcode = p9pdu_writef(pdu, proto_version, |
427 | "w", len); | |
e45c5405 | 428 | if (!errcode && pdu_write(pdu, sptr, len)) |
ace51c4d EVH |
429 | errcode = -EFAULT; |
430 | } | |
431 | break; | |
432 | case 'Q':{ | |
433 | const struct p9_qid *qid = | |
434 | va_arg(ap, const struct p9_qid *); | |
435 | errcode = | |
342fee1d | 436 | p9pdu_writef(pdu, proto_version, "bdq", |
ace51c4d EVH |
437 | qid->type, qid->version, |
438 | qid->path); | |
439 | } break; | |
440 | case 'S':{ | |
441 | const struct p9_wstat *stbuf = | |
442 | va_arg(ap, const struct p9_wstat *); | |
443 | errcode = | |
342fee1d | 444 | p9pdu_writef(pdu, proto_version, |
ace51c4d EVH |
445 | "wwdQdddqssss?sddd", |
446 | stbuf->size, stbuf->type, | |
51a87c55 | 447 | stbuf->dev, &stbuf->qid, |
ace51c4d EVH |
448 | stbuf->mode, stbuf->atime, |
449 | stbuf->mtime, stbuf->length, | |
450 | stbuf->name, stbuf->uid, | |
451 | stbuf->gid, stbuf->muid, | |
452 | stbuf->extension, stbuf->n_uid, | |
453 | stbuf->n_gid, stbuf->n_muid); | |
454 | } break; | |
455 | case 'D':{ | |
456 | int32_t count = va_arg(ap, int32_t); | |
457 | const void *data = va_arg(ap, const void *); | |
458 | ||
342fee1d SK |
459 | errcode = p9pdu_writef(pdu, proto_version, "d", |
460 | count); | |
ace51c4d EVH |
461 | if (!errcode && pdu_write(pdu, data, count)) |
462 | errcode = -EFAULT; | |
463 | } | |
464 | break; | |
51a87c55 EVH |
465 | case 'U':{ |
466 | int32_t count = va_arg(ap, int32_t); | |
467 | const char __user *udata = | |
e45c5405 | 468 | va_arg(ap, const void __user *); |
342fee1d SK |
469 | errcode = p9pdu_writef(pdu, proto_version, "d", |
470 | count); | |
51a87c55 EVH |
471 | if (!errcode && pdu_write_u(pdu, udata, count)) |
472 | errcode = -EFAULT; | |
473 | } | |
474 | break; | |
ace51c4d EVH |
475 | case 'T':{ |
476 | int16_t nwname = va_arg(ap, int); | |
477 | const char **wnames = va_arg(ap, const char **); | |
478 | ||
342fee1d SK |
479 | errcode = p9pdu_writef(pdu, proto_version, "w", |
480 | nwname); | |
ace51c4d EVH |
481 | if (!errcode) { |
482 | int i; | |
483 | ||
484 | for (i = 0; i < nwname; i++) { | |
485 | errcode = | |
342fee1d SK |
486 | p9pdu_writef(pdu, |
487 | proto_version, | |
ace51c4d EVH |
488 | "s", |
489 | wnames[i]); | |
490 | if (errcode) | |
491 | break; | |
492 | } | |
493 | } | |
494 | } | |
495 | break; | |
496 | case 'R':{ | |
497 | int16_t nwqid = va_arg(ap, int); | |
498 | struct p9_qid *wqids = | |
499 | va_arg(ap, struct p9_qid *); | |
500 | ||
342fee1d SK |
501 | errcode = p9pdu_writef(pdu, proto_version, "w", |
502 | nwqid); | |
ace51c4d EVH |
503 | if (!errcode) { |
504 | int i; | |
505 | ||
506 | for (i = 0; i < nwqid; i++) { | |
507 | errcode = | |
342fee1d SK |
508 | p9pdu_writef(pdu, |
509 | proto_version, | |
ace51c4d EVH |
510 | "Q", |
511 | &wqids[i]); | |
512 | if (errcode) | |
513 | break; | |
514 | } | |
515 | } | |
516 | } | |
517 | break; | |
87d7845a SK |
518 | case 'I':{ |
519 | struct p9_iattr_dotl *p9attr = va_arg(ap, | |
520 | struct p9_iattr_dotl *); | |
521 | ||
522 | errcode = p9pdu_writef(pdu, proto_version, | |
523 | "ddddqqqqq", | |
524 | p9attr->valid, | |
525 | p9attr->mode, | |
526 | p9attr->uid, | |
527 | p9attr->gid, | |
528 | p9attr->size, | |
529 | p9attr->atime_sec, | |
530 | p9attr->atime_nsec, | |
531 | p9attr->mtime_sec, | |
532 | p9attr->mtime_nsec); | |
533 | } | |
534 | break; | |
ace51c4d | 535 | case '?': |
c56e4acf SK |
536 | if ((proto_version != p9_proto_2000u) && |
537 | (proto_version != p9_proto_2000L)) | |
ace51c4d EVH |
538 | return 0; |
539 | break; | |
540 | default: | |
541 | BUG(); | |
542 | break; | |
543 | } | |
544 | ||
545 | if (errcode) | |
546 | break; | |
547 | } | |
548 | ||
549 | return errcode; | |
550 | } | |
551 | ||
342fee1d | 552 | int p9pdu_readf(struct p9_fcall *pdu, int proto_version, const char *fmt, ...) |
ace51c4d EVH |
553 | { |
554 | va_list ap; | |
555 | int ret; | |
556 | ||
557 | va_start(ap, fmt); | |
342fee1d | 558 | ret = p9pdu_vreadf(pdu, proto_version, fmt, ap); |
ace51c4d EVH |
559 | va_end(ap); |
560 | ||
561 | return ret; | |
562 | } | |
563 | ||
564 | static int | |
342fee1d | 565 | p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...) |
ace51c4d EVH |
566 | { |
567 | va_list ap; | |
568 | int ret; | |
569 | ||
570 | va_start(ap, fmt); | |
342fee1d | 571 | ret = p9pdu_vwritef(pdu, proto_version, fmt, ap); |
ace51c4d EVH |
572 | va_end(ap); |
573 | ||
574 | return ret; | |
575 | } | |
51a87c55 | 576 | |
342fee1d | 577 | int p9stat_read(char *buf, int len, struct p9_wstat *st, int proto_version) |
02da398b EVH |
578 | { |
579 | struct p9_fcall fake_pdu; | |
e7f4b8f1 | 580 | int ret; |
02da398b EVH |
581 | |
582 | fake_pdu.size = len; | |
583 | fake_pdu.capacity = len; | |
584 | fake_pdu.sdata = buf; | |
585 | fake_pdu.offset = 0; | |
586 | ||
342fee1d | 587 | ret = p9pdu_readf(&fake_pdu, proto_version, "S", st); |
e7f4b8f1 EVH |
588 | if (ret) { |
589 | P9_DPRINTK(P9_DEBUG_9P, "<<< p9stat_read failed: %d\n", ret); | |
590 | p9pdu_dump(1, &fake_pdu); | |
591 | } | |
592 | ||
593 | return ret; | |
02da398b EVH |
594 | } |
595 | EXPORT_SYMBOL(p9stat_read); | |
596 | ||
51a87c55 EVH |
597 | int p9pdu_prepare(struct p9_fcall *pdu, int16_t tag, int8_t type) |
598 | { | |
599 | return p9pdu_writef(pdu, 0, "dbw", 0, type, tag); | |
600 | } | |
601 | ||
602 | int p9pdu_finalize(struct p9_fcall *pdu) | |
603 | { | |
604 | int size = pdu->size; | |
605 | int err; | |
606 | ||
607 | pdu->size = 0; | |
608 | err = p9pdu_writef(pdu, 0, "d", size); | |
609 | pdu->size = size; | |
610 | ||
0b15a3a5 | 611 | #ifdef CONFIG_NET_9P_DEBUG |
e7f4b8f1 | 612 | if ((p9_debug_level & P9_DEBUG_PKT) == P9_DEBUG_PKT) |
51a87c55 | 613 | p9pdu_dump(0, pdu); |
0b15a3a5 | 614 | #endif |
51a87c55 | 615 | |
e7f4b8f1 EVH |
616 | P9_DPRINTK(P9_DEBUG_9P, ">>> size=%d type: %d tag: %d\n", pdu->size, |
617 | pdu->id, pdu->tag); | |
618 | ||
51a87c55 EVH |
619 | return err; |
620 | } | |
621 | ||
622 | void p9pdu_reset(struct p9_fcall *pdu) | |
623 | { | |
624 | pdu->offset = 0; | |
625 | pdu->size = 0; | |
626 | } | |
7751bdb3 SK |
627 | |
628 | int p9dirent_read(char *buf, int len, struct p9_dirent *dirent, | |
629 | int proto_version) | |
630 | { | |
631 | struct p9_fcall fake_pdu; | |
632 | int ret; | |
633 | char *nameptr; | |
634 | ||
635 | fake_pdu.size = len; | |
636 | fake_pdu.capacity = len; | |
637 | fake_pdu.sdata = buf; | |
638 | fake_pdu.offset = 0; | |
639 | ||
640 | ret = p9pdu_readf(&fake_pdu, proto_version, "Qqbs", &dirent->qid, | |
641 | &dirent->d_off, &dirent->d_type, &nameptr); | |
642 | if (ret) { | |
643 | P9_DPRINTK(P9_DEBUG_9P, "<<< p9dirent_read failed: %d\n", ret); | |
644 | p9pdu_dump(1, &fake_pdu); | |
645 | goto out; | |
646 | } | |
647 | ||
648 | strcpy(dirent->d_name, nameptr); | |
649 | ||
650 | out: | |
651 | return fake_pdu.offset; | |
652 | } | |
653 | EXPORT_SYMBOL(p9dirent_read); |