Commit | Line | Data |
---|---|---|
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); | |
125 | int err = copy_from_user(&pdu->sdata[pdu->size], udata, len); | |
126 | if (err) | |
127 | printk(KERN_WARNING "pdu_write_u returning: %d\n", err); | |
128 | ||
129 | pdu->size += len; | |
130 | return size - len; | |
131 | } | |
132 | ||
ace51c4d EVH |
133 | /* |
134 | b - int8_t | |
135 | w - int16_t | |
136 | d - int32_t | |
137 | q - int64_t | |
138 | s - string | |
139 | S - stat | |
140 | Q - qid | |
141 | D - data blob (int32_t size followed by void *, results are not freed) | |
142 | T - array of strings (int16_t count, followed by strings) | |
143 | R - array of qids (int16_t count, followed by qids) | |
f0853122 | 144 | A - stat for 9p2000.L (p9_stat_dotl) |
ace51c4d EVH |
145 | ? - if optional = 1, continue parsing |
146 | */ | |
147 | ||
148 | static int | |
342fee1d SK |
149 | p9pdu_vreadf(struct p9_fcall *pdu, int proto_version, const char *fmt, |
150 | va_list ap) | |
ace51c4d EVH |
151 | { |
152 | const char *ptr; | |
153 | int errcode = 0; | |
154 | ||
155 | for (ptr = fmt; *ptr; ptr++) { | |
156 | switch (*ptr) { | |
157 | case 'b':{ | |
158 | int8_t *val = va_arg(ap, int8_t *); | |
159 | if (pdu_read(pdu, val, sizeof(*val))) { | |
160 | errcode = -EFAULT; | |
161 | break; | |
162 | } | |
163 | } | |
164 | break; | |
165 | case 'w':{ | |
166 | int16_t *val = va_arg(ap, int16_t *); | |
beeebc92 EVH |
167 | __le16 le_val; |
168 | if (pdu_read(pdu, &le_val, sizeof(le_val))) { | |
ace51c4d EVH |
169 | errcode = -EFAULT; |
170 | break; | |
171 | } | |
beeebc92 | 172 | *val = le16_to_cpu(le_val); |
ace51c4d EVH |
173 | } |
174 | break; | |
175 | case 'd':{ | |
176 | int32_t *val = va_arg(ap, int32_t *); | |
beeebc92 EVH |
177 | __le32 le_val; |
178 | if (pdu_read(pdu, &le_val, sizeof(le_val))) { | |
ace51c4d EVH |
179 | errcode = -EFAULT; |
180 | break; | |
181 | } | |
beeebc92 | 182 | *val = le32_to_cpu(le_val); |
ace51c4d EVH |
183 | } |
184 | break; | |
185 | case 'q':{ | |
186 | int64_t *val = va_arg(ap, int64_t *); | |
beeebc92 EVH |
187 | __le64 le_val; |
188 | if (pdu_read(pdu, &le_val, sizeof(le_val))) { | |
ace51c4d EVH |
189 | errcode = -EFAULT; |
190 | break; | |
191 | } | |
beeebc92 | 192 | *val = le64_to_cpu(le_val); |
ace51c4d EVH |
193 | } |
194 | break; | |
195 | case 's':{ | |
e45c5405 | 196 | char **sptr = va_arg(ap, char **); |
ace51c4d EVH |
197 | int16_t len; |
198 | int size; | |
199 | ||
342fee1d SK |
200 | errcode = p9pdu_readf(pdu, proto_version, |
201 | "w", &len); | |
ace51c4d EVH |
202 | if (errcode) |
203 | break; | |
204 | ||
205 | size = MAX(len, 0); | |
206 | ||
e45c5405 EVH |
207 | *sptr = kmalloc(size + 1, GFP_KERNEL); |
208 | if (*sptr == NULL) { | |
ace51c4d EVH |
209 | errcode = -EFAULT; |
210 | break; | |
211 | } | |
e45c5405 | 212 | if (pdu_read(pdu, *sptr, size)) { |
ace51c4d | 213 | errcode = -EFAULT; |
e45c5405 EVH |
214 | kfree(*sptr); |
215 | *sptr = NULL; | |
ace51c4d | 216 | } else |
e45c5405 | 217 | (*sptr)[size] = 0; |
ace51c4d EVH |
218 | } |
219 | break; | |
220 | case 'Q':{ | |
221 | struct p9_qid *qid = | |
222 | va_arg(ap, struct p9_qid *); | |
223 | ||
342fee1d | 224 | errcode = p9pdu_readf(pdu, proto_version, "bdq", |
ace51c4d EVH |
225 | &qid->type, &qid->version, |
226 | &qid->path); | |
227 | } | |
228 | break; | |
229 | case 'S':{ | |
230 | struct p9_wstat *stbuf = | |
231 | va_arg(ap, struct p9_wstat *); | |
232 | ||
f0a0ac2e | 233 | memset(stbuf, 0, sizeof(struct p9_wstat)); |
ace51c4d | 234 | stbuf->n_uid = stbuf->n_gid = stbuf->n_muid = |
f0a0ac2e | 235 | -1; |
ace51c4d | 236 | errcode = |
342fee1d | 237 | p9pdu_readf(pdu, proto_version, |
ace51c4d EVH |
238 | "wwdQdddqssss?sddd", |
239 | &stbuf->size, &stbuf->type, | |
240 | &stbuf->dev, &stbuf->qid, | |
241 | &stbuf->mode, &stbuf->atime, | |
242 | &stbuf->mtime, &stbuf->length, | |
243 | &stbuf->name, &stbuf->uid, | |
244 | &stbuf->gid, &stbuf->muid, | |
245 | &stbuf->extension, | |
246 | &stbuf->n_uid, &stbuf->n_gid, | |
247 | &stbuf->n_muid); | |
248 | if (errcode) | |
249 | p9stat_free(stbuf); | |
250 | } | |
251 | break; | |
252 | case 'D':{ | |
253 | int32_t *count = va_arg(ap, int32_t *); | |
254 | void **data = va_arg(ap, void **); | |
255 | ||
256 | errcode = | |
342fee1d | 257 | p9pdu_readf(pdu, proto_version, "d", count); |
ace51c4d EVH |
258 | if (!errcode) { |
259 | *count = | |
260 | MIN(*count, | |
261 | pdu->size - pdu->offset); | |
262 | *data = &pdu->sdata[pdu->offset]; | |
263 | } | |
264 | } | |
265 | break; | |
266 | case 'T':{ | |
267 | int16_t *nwname = va_arg(ap, int16_t *); | |
268 | char ***wnames = va_arg(ap, char ***); | |
269 | ||
342fee1d SK |
270 | errcode = p9pdu_readf(pdu, proto_version, |
271 | "w", nwname); | |
ace51c4d EVH |
272 | if (!errcode) { |
273 | *wnames = | |
274 | kmalloc(sizeof(char *) * *nwname, | |
275 | GFP_KERNEL); | |
276 | if (!*wnames) | |
277 | errcode = -ENOMEM; | |
278 | } | |
279 | ||
280 | if (!errcode) { | |
281 | int i; | |
282 | ||
283 | for (i = 0; i < *nwname; i++) { | |
284 | errcode = | |
342fee1d SK |
285 | p9pdu_readf(pdu, |
286 | proto_version, | |
ace51c4d EVH |
287 | "s", |
288 | &(*wnames)[i]); | |
289 | if (errcode) | |
290 | break; | |
291 | } | |
292 | } | |
293 | ||
294 | if (errcode) { | |
295 | if (*wnames) { | |
296 | int i; | |
297 | ||
298 | for (i = 0; i < *nwname; i++) | |
299 | kfree((*wnames)[i]); | |
300 | } | |
301 | kfree(*wnames); | |
302 | *wnames = NULL; | |
303 | } | |
304 | } | |
305 | break; | |
306 | case 'R':{ | |
307 | int16_t *nwqid = va_arg(ap, int16_t *); | |
308 | struct p9_qid **wqids = | |
309 | va_arg(ap, struct p9_qid **); | |
310 | ||
311 | *wqids = NULL; | |
312 | ||
313 | errcode = | |
342fee1d | 314 | p9pdu_readf(pdu, proto_version, "w", nwqid); |
ace51c4d EVH |
315 | if (!errcode) { |
316 | *wqids = | |
317 | kmalloc(*nwqid * | |
318 | sizeof(struct p9_qid), | |
319 | GFP_KERNEL); | |
320 | if (*wqids == NULL) | |
321 | errcode = -ENOMEM; | |
322 | } | |
323 | ||
324 | if (!errcode) { | |
325 | int i; | |
326 | ||
327 | for (i = 0; i < *nwqid; i++) { | |
328 | errcode = | |
342fee1d SK |
329 | p9pdu_readf(pdu, |
330 | proto_version, | |
ace51c4d EVH |
331 | "Q", |
332 | &(*wqids)[i]); | |
333 | if (errcode) | |
334 | break; | |
335 | } | |
336 | } | |
337 | ||
338 | if (errcode) { | |
339 | kfree(*wqids); | |
340 | *wqids = NULL; | |
341 | } | |
342 | } | |
343 | break; | |
f0853122 SK |
344 | case 'A': { |
345 | struct p9_stat_dotl *stbuf = | |
346 | va_arg(ap, struct p9_stat_dotl *); | |
347 | ||
348 | memset(stbuf, 0, sizeof(struct p9_stat_dotl)); | |
349 | errcode = | |
350 | p9pdu_readf(pdu, proto_version, | |
351 | "qQdddqqqqqqqqqqqqqqq", | |
352 | &stbuf->st_result_mask, | |
353 | &stbuf->qid, | |
354 | &stbuf->st_mode, | |
355 | &stbuf->st_uid, &stbuf->st_gid, | |
356 | &stbuf->st_nlink, | |
357 | &stbuf->st_rdev, &stbuf->st_size, | |
358 | &stbuf->st_blksize, &stbuf->st_blocks, | |
359 | &stbuf->st_atime_sec, | |
360 | &stbuf->st_atime_nsec, | |
361 | &stbuf->st_mtime_sec, | |
362 | &stbuf->st_mtime_nsec, | |
363 | &stbuf->st_ctime_sec, | |
364 | &stbuf->st_ctime_nsec, | |
365 | &stbuf->st_btime_sec, | |
366 | &stbuf->st_btime_nsec, | |
367 | &stbuf->st_gen, | |
368 | &stbuf->st_data_version); | |
369 | } | |
370 | break; | |
ace51c4d | 371 | case '?': |
c56e4acf SK |
372 | if ((proto_version != p9_proto_2000u) && |
373 | (proto_version != p9_proto_2000L)) | |
ace51c4d EVH |
374 | return 0; |
375 | break; | |
376 | default: | |
377 | BUG(); | |
378 | break; | |
379 | } | |
380 | ||
381 | if (errcode) | |
382 | break; | |
383 | } | |
384 | ||
385 | return errcode; | |
386 | } | |
387 | ||
388 | int | |
342fee1d SK |
389 | p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt, |
390 | va_list ap) | |
ace51c4d EVH |
391 | { |
392 | const char *ptr; | |
393 | int errcode = 0; | |
394 | ||
395 | for (ptr = fmt; *ptr; ptr++) { | |
396 | switch (*ptr) { | |
397 | case 'b':{ | |
398 | int8_t val = va_arg(ap, int); | |
399 | if (pdu_write(pdu, &val, sizeof(val))) | |
400 | errcode = -EFAULT; | |
401 | } | |
402 | break; | |
403 | case 'w':{ | |
beeebc92 | 404 | __le16 val = cpu_to_le16(va_arg(ap, int)); |
ace51c4d EVH |
405 | if (pdu_write(pdu, &val, sizeof(val))) |
406 | errcode = -EFAULT; | |
407 | } | |
408 | break; | |
409 | case 'd':{ | |
beeebc92 | 410 | __le32 val = cpu_to_le32(va_arg(ap, int32_t)); |
ace51c4d EVH |
411 | if (pdu_write(pdu, &val, sizeof(val))) |
412 | errcode = -EFAULT; | |
413 | } | |
414 | break; | |
415 | case 'q':{ | |
beeebc92 | 416 | __le64 val = cpu_to_le64(va_arg(ap, int64_t)); |
ace51c4d EVH |
417 | if (pdu_write(pdu, &val, sizeof(val))) |
418 | errcode = -EFAULT; | |
419 | } | |
420 | break; | |
421 | case 's':{ | |
e45c5405 | 422 | const char *sptr = va_arg(ap, const char *); |
ace51c4d | 423 | int16_t len = 0; |
e45c5405 | 424 | if (sptr) |
4be929be | 425 | len = MIN(strlen(sptr), USHRT_MAX); |
ace51c4d | 426 | |
342fee1d SK |
427 | errcode = p9pdu_writef(pdu, proto_version, |
428 | "w", len); | |
e45c5405 | 429 | if (!errcode && pdu_write(pdu, sptr, len)) |
ace51c4d EVH |
430 | errcode = -EFAULT; |
431 | } | |
432 | break; | |
433 | case 'Q':{ | |
434 | const struct p9_qid *qid = | |
435 | va_arg(ap, const struct p9_qid *); | |
436 | errcode = | |
342fee1d | 437 | p9pdu_writef(pdu, proto_version, "bdq", |
ace51c4d EVH |
438 | qid->type, qid->version, |
439 | qid->path); | |
440 | } break; | |
441 | case 'S':{ | |
442 | const struct p9_wstat *stbuf = | |
443 | va_arg(ap, const struct p9_wstat *); | |
444 | errcode = | |
342fee1d | 445 | p9pdu_writef(pdu, proto_version, |
ace51c4d EVH |
446 | "wwdQdddqssss?sddd", |
447 | stbuf->size, stbuf->type, | |
51a87c55 | 448 | stbuf->dev, &stbuf->qid, |
ace51c4d EVH |
449 | stbuf->mode, stbuf->atime, |
450 | stbuf->mtime, stbuf->length, | |
451 | stbuf->name, stbuf->uid, | |
452 | stbuf->gid, stbuf->muid, | |
453 | stbuf->extension, stbuf->n_uid, | |
454 | stbuf->n_gid, stbuf->n_muid); | |
455 | } break; | |
456 | case 'D':{ | |
457 | int32_t count = va_arg(ap, int32_t); | |
458 | const void *data = va_arg(ap, const void *); | |
459 | ||
342fee1d SK |
460 | errcode = p9pdu_writef(pdu, proto_version, "d", |
461 | count); | |
ace51c4d EVH |
462 | if (!errcode && pdu_write(pdu, data, count)) |
463 | errcode = -EFAULT; | |
464 | } | |
465 | break; | |
51a87c55 EVH |
466 | case 'U':{ |
467 | int32_t count = va_arg(ap, int32_t); | |
468 | const char __user *udata = | |
e45c5405 | 469 | va_arg(ap, const void __user *); |
342fee1d SK |
470 | errcode = p9pdu_writef(pdu, proto_version, "d", |
471 | count); | |
51a87c55 EVH |
472 | if (!errcode && pdu_write_u(pdu, udata, count)) |
473 | errcode = -EFAULT; | |
474 | } | |
475 | break; | |
ace51c4d EVH |
476 | case 'T':{ |
477 | int16_t nwname = va_arg(ap, int); | |
478 | const char **wnames = va_arg(ap, const char **); | |
479 | ||
342fee1d SK |
480 | errcode = p9pdu_writef(pdu, proto_version, "w", |
481 | nwname); | |
ace51c4d EVH |
482 | if (!errcode) { |
483 | int i; | |
484 | ||
485 | for (i = 0; i < nwname; i++) { | |
486 | errcode = | |
342fee1d SK |
487 | p9pdu_writef(pdu, |
488 | proto_version, | |
ace51c4d EVH |
489 | "s", |
490 | wnames[i]); | |
491 | if (errcode) | |
492 | break; | |
493 | } | |
494 | } | |
495 | } | |
496 | break; | |
497 | case 'R':{ | |
498 | int16_t nwqid = va_arg(ap, int); | |
499 | struct p9_qid *wqids = | |
500 | va_arg(ap, struct p9_qid *); | |
501 | ||
342fee1d SK |
502 | errcode = p9pdu_writef(pdu, proto_version, "w", |
503 | nwqid); | |
ace51c4d EVH |
504 | if (!errcode) { |
505 | int i; | |
506 | ||
507 | for (i = 0; i < nwqid; i++) { | |
508 | errcode = | |
342fee1d SK |
509 | p9pdu_writef(pdu, |
510 | proto_version, | |
ace51c4d EVH |
511 | "Q", |
512 | &wqids[i]); | |
513 | if (errcode) | |
514 | break; | |
515 | } | |
516 | } | |
517 | } | |
518 | break; | |
87d7845a SK |
519 | case 'I':{ |
520 | struct p9_iattr_dotl *p9attr = va_arg(ap, | |
521 | struct p9_iattr_dotl *); | |
522 | ||
523 | errcode = p9pdu_writef(pdu, proto_version, | |
524 | "ddddqqqqq", | |
525 | p9attr->valid, | |
526 | p9attr->mode, | |
527 | p9attr->uid, | |
528 | p9attr->gid, | |
529 | p9attr->size, | |
530 | p9attr->atime_sec, | |
531 | p9attr->atime_nsec, | |
532 | p9attr->mtime_sec, | |
533 | p9attr->mtime_nsec); | |
534 | } | |
535 | break; | |
ace51c4d | 536 | case '?': |
c56e4acf SK |
537 | if ((proto_version != p9_proto_2000u) && |
538 | (proto_version != p9_proto_2000L)) | |
ace51c4d EVH |
539 | return 0; |
540 | break; | |
541 | default: | |
542 | BUG(); | |
543 | break; | |
544 | } | |
545 | ||
546 | if (errcode) | |
547 | break; | |
548 | } | |
549 | ||
550 | return errcode; | |
551 | } | |
552 | ||
342fee1d | 553 | int p9pdu_readf(struct p9_fcall *pdu, int proto_version, const char *fmt, ...) |
ace51c4d EVH |
554 | { |
555 | va_list ap; | |
556 | int ret; | |
557 | ||
558 | va_start(ap, fmt); | |
342fee1d | 559 | ret = p9pdu_vreadf(pdu, proto_version, fmt, ap); |
ace51c4d EVH |
560 | va_end(ap); |
561 | ||
562 | return ret; | |
563 | } | |
564 | ||
565 | static int | |
342fee1d | 566 | p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...) |
ace51c4d EVH |
567 | { |
568 | va_list ap; | |
569 | int ret; | |
570 | ||
571 | va_start(ap, fmt); | |
342fee1d | 572 | ret = p9pdu_vwritef(pdu, proto_version, fmt, ap); |
ace51c4d EVH |
573 | va_end(ap); |
574 | ||
575 | return ret; | |
576 | } | |
51a87c55 | 577 | |
342fee1d | 578 | int p9stat_read(char *buf, int len, struct p9_wstat *st, int proto_version) |
02da398b EVH |
579 | { |
580 | struct p9_fcall fake_pdu; | |
e7f4b8f1 | 581 | int ret; |
02da398b EVH |
582 | |
583 | fake_pdu.size = len; | |
584 | fake_pdu.capacity = len; | |
585 | fake_pdu.sdata = buf; | |
586 | fake_pdu.offset = 0; | |
587 | ||
342fee1d | 588 | ret = p9pdu_readf(&fake_pdu, proto_version, "S", st); |
e7f4b8f1 EVH |
589 | if (ret) { |
590 | P9_DPRINTK(P9_DEBUG_9P, "<<< p9stat_read failed: %d\n", ret); | |
591 | p9pdu_dump(1, &fake_pdu); | |
592 | } | |
593 | ||
594 | return ret; | |
02da398b EVH |
595 | } |
596 | EXPORT_SYMBOL(p9stat_read); | |
597 | ||
51a87c55 EVH |
598 | int p9pdu_prepare(struct p9_fcall *pdu, int16_t tag, int8_t type) |
599 | { | |
600 | return p9pdu_writef(pdu, 0, "dbw", 0, type, tag); | |
601 | } | |
602 | ||
603 | int p9pdu_finalize(struct p9_fcall *pdu) | |
604 | { | |
605 | int size = pdu->size; | |
606 | int err; | |
607 | ||
608 | pdu->size = 0; | |
609 | err = p9pdu_writef(pdu, 0, "d", size); | |
610 | pdu->size = size; | |
611 | ||
0b15a3a5 | 612 | #ifdef CONFIG_NET_9P_DEBUG |
e7f4b8f1 | 613 | if ((p9_debug_level & P9_DEBUG_PKT) == P9_DEBUG_PKT) |
51a87c55 | 614 | p9pdu_dump(0, pdu); |
0b15a3a5 | 615 | #endif |
51a87c55 | 616 | |
e7f4b8f1 EVH |
617 | P9_DPRINTK(P9_DEBUG_9P, ">>> size=%d type: %d tag: %d\n", pdu->size, |
618 | pdu->id, pdu->tag); | |
619 | ||
51a87c55 EVH |
620 | return err; |
621 | } | |
622 | ||
623 | void p9pdu_reset(struct p9_fcall *pdu) | |
624 | { | |
625 | pdu->offset = 0; | |
626 | pdu->size = 0; | |
627 | } | |
7751bdb3 SK |
628 | |
629 | int p9dirent_read(char *buf, int len, struct p9_dirent *dirent, | |
630 | int proto_version) | |
631 | { | |
632 | struct p9_fcall fake_pdu; | |
633 | int ret; | |
634 | char *nameptr; | |
635 | ||
636 | fake_pdu.size = len; | |
637 | fake_pdu.capacity = len; | |
638 | fake_pdu.sdata = buf; | |
639 | fake_pdu.offset = 0; | |
640 | ||
641 | ret = p9pdu_readf(&fake_pdu, proto_version, "Qqbs", &dirent->qid, | |
642 | &dirent->d_off, &dirent->d_type, &nameptr); | |
643 | if (ret) { | |
644 | P9_DPRINTK(P9_DEBUG_9P, "<<< p9dirent_read failed: %d\n", ret); | |
645 | p9pdu_dump(1, &fake_pdu); | |
646 | goto out; | |
647 | } | |
648 | ||
649 | strcpy(dirent->d_name, nameptr); | |
650 | ||
651 | out: | |
652 | return fake_pdu.offset; | |
653 | } | |
654 | EXPORT_SYMBOL(p9dirent_read); |