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> | |
01b0c5cf | 30 | #include <linux/kernel.h> |
51a87c55 | 31 | #include <linux/uaccess.h> |
5a0e3ad6 | 32 | #include <linux/slab.h> |
e7f4b8f1 | 33 | #include <linux/sched.h> |
01b0c5cf | 34 | #include <linux/stddef.h> |
beeebc92 | 35 | #include <linux/types.h> |
ace51c4d EVH |
36 | #include <net/9p/9p.h> |
37 | #include <net/9p/client.h> | |
38 | #include "protocol.h" | |
39 | ||
ace51c4d | 40 | static int |
342fee1d | 41 | p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...); |
ace51c4d | 42 | |
0b15a3a5 | 43 | #ifdef CONFIG_NET_9P_DEBUG |
51a87c55 EVH |
44 | void |
45 | p9pdu_dump(int way, struct p9_fcall *pdu) | |
46 | { | |
47 | int i, n; | |
48 | u8 *data = pdu->sdata; | |
49 | int datalen = pdu->size; | |
50 | char buf[255]; | |
51 | int buflen = 255; | |
52 | ||
53 | i = n = 0; | |
54 | if (datalen > (buflen-16)) | |
55 | datalen = buflen-16; | |
56 | while (i < datalen) { | |
57 | n += scnprintf(buf + n, buflen - n, "%02x ", data[i]); | |
58 | if (i%4 == 3) | |
59 | n += scnprintf(buf + n, buflen - n, " "); | |
60 | if (i%32 == 31) | |
61 | n += scnprintf(buf + n, buflen - n, "\n"); | |
62 | ||
63 | i++; | |
64 | } | |
65 | n += scnprintf(buf + n, buflen - n, "\n"); | |
66 | ||
67 | if (way) | |
e7f4b8f1 | 68 | P9_DPRINTK(P9_DEBUG_PKT, "[[[(%d) %s\n", datalen, buf); |
51a87c55 | 69 | else |
e7f4b8f1 | 70 | P9_DPRINTK(P9_DEBUG_PKT, "]]](%d) %s\n", datalen, buf); |
51a87c55 | 71 | } |
0b15a3a5 EVH |
72 | #else |
73 | void | |
74 | p9pdu_dump(int way, struct p9_fcall *pdu) | |
75 | { | |
76 | } | |
77 | #endif | |
51a87c55 EVH |
78 | EXPORT_SYMBOL(p9pdu_dump); |
79 | ||
ace51c4d EVH |
80 | void p9stat_free(struct p9_wstat *stbuf) |
81 | { | |
82 | kfree(stbuf->name); | |
83 | kfree(stbuf->uid); | |
84 | kfree(stbuf->gid); | |
85 | kfree(stbuf->muid); | |
86 | kfree(stbuf->extension); | |
87 | } | |
88 | EXPORT_SYMBOL(p9stat_free); | |
89 | ||
90 | static size_t pdu_read(struct p9_fcall *pdu, void *data, size_t size) | |
91 | { | |
01b0c5cf | 92 | size_t len = min(pdu->size - pdu->offset, size); |
ace51c4d EVH |
93 | memcpy(data, &pdu->sdata[pdu->offset], len); |
94 | pdu->offset += len; | |
95 | return size - len; | |
96 | } | |
97 | ||
98 | static size_t pdu_write(struct p9_fcall *pdu, const void *data, size_t size) | |
99 | { | |
01b0c5cf | 100 | size_t len = min(pdu->capacity - pdu->size, size); |
ace51c4d EVH |
101 | memcpy(&pdu->sdata[pdu->size], data, len); |
102 | pdu->size += len; | |
103 | return size - len; | |
104 | } | |
105 | ||
51a87c55 EVH |
106 | static size_t |
107 | pdu_write_u(struct p9_fcall *pdu, const char __user *udata, size_t size) | |
108 | { | |
01b0c5cf | 109 | size_t len = min(pdu->capacity - pdu->size, size); |
7b3bb3fe AK |
110 | if (copy_from_user(&pdu->sdata[pdu->size], udata, len)) |
111 | len = 0; | |
51a87c55 EVH |
112 | |
113 | pdu->size += len; | |
114 | return size - len; | |
115 | } | |
116 | ||
ace51c4d EVH |
117 | /* |
118 | b - int8_t | |
119 | w - int16_t | |
120 | d - int32_t | |
121 | q - int64_t | |
122 | s - string | |
123 | S - stat | |
124 | Q - qid | |
125 | D - data blob (int32_t size followed by void *, results are not freed) | |
126 | T - array of strings (int16_t count, followed by strings) | |
127 | R - array of qids (int16_t count, followed by qids) | |
f0853122 | 128 | A - stat for 9p2000.L (p9_stat_dotl) |
ace51c4d EVH |
129 | ? - if optional = 1, continue parsing |
130 | */ | |
131 | ||
132 | static int | |
342fee1d SK |
133 | p9pdu_vreadf(struct p9_fcall *pdu, int proto_version, const char *fmt, |
134 | va_list ap) | |
ace51c4d EVH |
135 | { |
136 | const char *ptr; | |
137 | int errcode = 0; | |
138 | ||
139 | for (ptr = fmt; *ptr; ptr++) { | |
140 | switch (*ptr) { | |
141 | case 'b':{ | |
142 | int8_t *val = va_arg(ap, int8_t *); | |
143 | if (pdu_read(pdu, val, sizeof(*val))) { | |
144 | errcode = -EFAULT; | |
145 | break; | |
146 | } | |
147 | } | |
148 | break; | |
149 | case 'w':{ | |
150 | int16_t *val = va_arg(ap, int16_t *); | |
beeebc92 EVH |
151 | __le16 le_val; |
152 | if (pdu_read(pdu, &le_val, sizeof(le_val))) { | |
ace51c4d EVH |
153 | errcode = -EFAULT; |
154 | break; | |
155 | } | |
beeebc92 | 156 | *val = le16_to_cpu(le_val); |
ace51c4d EVH |
157 | } |
158 | break; | |
159 | case 'd':{ | |
160 | int32_t *val = va_arg(ap, int32_t *); | |
beeebc92 EVH |
161 | __le32 le_val; |
162 | if (pdu_read(pdu, &le_val, sizeof(le_val))) { | |
ace51c4d EVH |
163 | errcode = -EFAULT; |
164 | break; | |
165 | } | |
beeebc92 | 166 | *val = le32_to_cpu(le_val); |
ace51c4d EVH |
167 | } |
168 | break; | |
169 | case 'q':{ | |
170 | int64_t *val = va_arg(ap, int64_t *); | |
beeebc92 EVH |
171 | __le64 le_val; |
172 | if (pdu_read(pdu, &le_val, sizeof(le_val))) { | |
ace51c4d EVH |
173 | errcode = -EFAULT; |
174 | break; | |
175 | } | |
beeebc92 | 176 | *val = le64_to_cpu(le_val); |
ace51c4d EVH |
177 | } |
178 | break; | |
179 | case 's':{ | |
e45c5405 | 180 | char **sptr = va_arg(ap, char **); |
219fd58b | 181 | uint16_t len; |
ace51c4d | 182 | |
342fee1d SK |
183 | errcode = p9pdu_readf(pdu, proto_version, |
184 | "w", &len); | |
ace51c4d EVH |
185 | if (errcode) |
186 | break; | |
187 | ||
219fd58b | 188 | *sptr = kmalloc(len + 1, GFP_KERNEL); |
e45c5405 | 189 | if (*sptr == NULL) { |
ace51c4d EVH |
190 | errcode = -EFAULT; |
191 | break; | |
192 | } | |
219fd58b | 193 | if (pdu_read(pdu, *sptr, len)) { |
ace51c4d | 194 | errcode = -EFAULT; |
e45c5405 EVH |
195 | kfree(*sptr); |
196 | *sptr = NULL; | |
ace51c4d | 197 | } else |
219fd58b | 198 | (*sptr)[len] = 0; |
ace51c4d EVH |
199 | } |
200 | break; | |
201 | case 'Q':{ | |
202 | struct p9_qid *qid = | |
203 | va_arg(ap, struct p9_qid *); | |
204 | ||
342fee1d | 205 | errcode = p9pdu_readf(pdu, proto_version, "bdq", |
ace51c4d EVH |
206 | &qid->type, &qid->version, |
207 | &qid->path); | |
208 | } | |
209 | break; | |
210 | case 'S':{ | |
211 | struct p9_wstat *stbuf = | |
212 | va_arg(ap, struct p9_wstat *); | |
213 | ||
f0a0ac2e | 214 | memset(stbuf, 0, sizeof(struct p9_wstat)); |
ace51c4d | 215 | stbuf->n_uid = stbuf->n_gid = stbuf->n_muid = |
f0a0ac2e | 216 | -1; |
ace51c4d | 217 | errcode = |
342fee1d | 218 | p9pdu_readf(pdu, proto_version, |
ace51c4d EVH |
219 | "wwdQdddqssss?sddd", |
220 | &stbuf->size, &stbuf->type, | |
221 | &stbuf->dev, &stbuf->qid, | |
222 | &stbuf->mode, &stbuf->atime, | |
223 | &stbuf->mtime, &stbuf->length, | |
224 | &stbuf->name, &stbuf->uid, | |
225 | &stbuf->gid, &stbuf->muid, | |
226 | &stbuf->extension, | |
227 | &stbuf->n_uid, &stbuf->n_gid, | |
228 | &stbuf->n_muid); | |
229 | if (errcode) | |
230 | p9stat_free(stbuf); | |
231 | } | |
232 | break; | |
233 | case 'D':{ | |
219fd58b | 234 | uint32_t *count = va_arg(ap, uint32_t *); |
ace51c4d EVH |
235 | void **data = va_arg(ap, void **); |
236 | ||
237 | errcode = | |
342fee1d | 238 | p9pdu_readf(pdu, proto_version, "d", count); |
ace51c4d EVH |
239 | if (!errcode) { |
240 | *count = | |
219fd58b | 241 | min_t(uint32_t, *count, |
01b0c5cf | 242 | pdu->size - pdu->offset); |
ace51c4d EVH |
243 | *data = &pdu->sdata[pdu->offset]; |
244 | } | |
245 | } | |
246 | break; | |
247 | case 'T':{ | |
248 | int16_t *nwname = va_arg(ap, int16_t *); | |
249 | char ***wnames = va_arg(ap, char ***); | |
250 | ||
342fee1d SK |
251 | errcode = p9pdu_readf(pdu, proto_version, |
252 | "w", nwname); | |
ace51c4d EVH |
253 | if (!errcode) { |
254 | *wnames = | |
255 | kmalloc(sizeof(char *) * *nwname, | |
256 | GFP_KERNEL); | |
257 | if (!*wnames) | |
258 | errcode = -ENOMEM; | |
259 | } | |
260 | ||
261 | if (!errcode) { | |
262 | int i; | |
263 | ||
264 | for (i = 0; i < *nwname; i++) { | |
265 | errcode = | |
342fee1d SK |
266 | p9pdu_readf(pdu, |
267 | proto_version, | |
ace51c4d EVH |
268 | "s", |
269 | &(*wnames)[i]); | |
270 | if (errcode) | |
271 | break; | |
272 | } | |
273 | } | |
274 | ||
275 | if (errcode) { | |
276 | if (*wnames) { | |
277 | int i; | |
278 | ||
279 | for (i = 0; i < *nwname; i++) | |
280 | kfree((*wnames)[i]); | |
281 | } | |
282 | kfree(*wnames); | |
283 | *wnames = NULL; | |
284 | } | |
285 | } | |
286 | break; | |
287 | case 'R':{ | |
288 | int16_t *nwqid = va_arg(ap, int16_t *); | |
289 | struct p9_qid **wqids = | |
290 | va_arg(ap, struct p9_qid **); | |
291 | ||
292 | *wqids = NULL; | |
293 | ||
294 | errcode = | |
342fee1d | 295 | p9pdu_readf(pdu, proto_version, "w", nwqid); |
ace51c4d EVH |
296 | if (!errcode) { |
297 | *wqids = | |
298 | kmalloc(*nwqid * | |
299 | sizeof(struct p9_qid), | |
300 | GFP_KERNEL); | |
301 | if (*wqids == NULL) | |
302 | errcode = -ENOMEM; | |
303 | } | |
304 | ||
305 | if (!errcode) { | |
306 | int i; | |
307 | ||
308 | for (i = 0; i < *nwqid; i++) { | |
309 | errcode = | |
342fee1d SK |
310 | p9pdu_readf(pdu, |
311 | proto_version, | |
ace51c4d EVH |
312 | "Q", |
313 | &(*wqids)[i]); | |
314 | if (errcode) | |
315 | break; | |
316 | } | |
317 | } | |
318 | ||
319 | if (errcode) { | |
320 | kfree(*wqids); | |
321 | *wqids = NULL; | |
322 | } | |
323 | } | |
324 | break; | |
f0853122 SK |
325 | case 'A': { |
326 | struct p9_stat_dotl *stbuf = | |
327 | va_arg(ap, struct p9_stat_dotl *); | |
328 | ||
329 | memset(stbuf, 0, sizeof(struct p9_stat_dotl)); | |
330 | errcode = | |
331 | p9pdu_readf(pdu, proto_version, | |
332 | "qQdddqqqqqqqqqqqqqqq", | |
333 | &stbuf->st_result_mask, | |
334 | &stbuf->qid, | |
335 | &stbuf->st_mode, | |
336 | &stbuf->st_uid, &stbuf->st_gid, | |
337 | &stbuf->st_nlink, | |
338 | &stbuf->st_rdev, &stbuf->st_size, | |
339 | &stbuf->st_blksize, &stbuf->st_blocks, | |
340 | &stbuf->st_atime_sec, | |
341 | &stbuf->st_atime_nsec, | |
342 | &stbuf->st_mtime_sec, | |
343 | &stbuf->st_mtime_nsec, | |
344 | &stbuf->st_ctime_sec, | |
345 | &stbuf->st_ctime_nsec, | |
346 | &stbuf->st_btime_sec, | |
347 | &stbuf->st_btime_nsec, | |
348 | &stbuf->st_gen, | |
349 | &stbuf->st_data_version); | |
350 | } | |
351 | break; | |
ace51c4d | 352 | case '?': |
c56e4acf SK |
353 | if ((proto_version != p9_proto_2000u) && |
354 | (proto_version != p9_proto_2000L)) | |
ace51c4d EVH |
355 | return 0; |
356 | break; | |
357 | default: | |
358 | BUG(); | |
359 | break; | |
360 | } | |
361 | ||
362 | if (errcode) | |
363 | break; | |
364 | } | |
365 | ||
366 | return errcode; | |
367 | } | |
368 | ||
369 | int | |
342fee1d SK |
370 | p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt, |
371 | va_list ap) | |
ace51c4d EVH |
372 | { |
373 | const char *ptr; | |
374 | int errcode = 0; | |
375 | ||
376 | for (ptr = fmt; *ptr; ptr++) { | |
377 | switch (*ptr) { | |
378 | case 'b':{ | |
379 | int8_t val = va_arg(ap, int); | |
380 | if (pdu_write(pdu, &val, sizeof(val))) | |
381 | errcode = -EFAULT; | |
382 | } | |
383 | break; | |
384 | case 'w':{ | |
beeebc92 | 385 | __le16 val = cpu_to_le16(va_arg(ap, int)); |
ace51c4d EVH |
386 | if (pdu_write(pdu, &val, sizeof(val))) |
387 | errcode = -EFAULT; | |
388 | } | |
389 | break; | |
390 | case 'd':{ | |
beeebc92 | 391 | __le32 val = cpu_to_le32(va_arg(ap, int32_t)); |
ace51c4d EVH |
392 | if (pdu_write(pdu, &val, sizeof(val))) |
393 | errcode = -EFAULT; | |
394 | } | |
395 | break; | |
396 | case 'q':{ | |
beeebc92 | 397 | __le64 val = cpu_to_le64(va_arg(ap, int64_t)); |
ace51c4d EVH |
398 | if (pdu_write(pdu, &val, sizeof(val))) |
399 | errcode = -EFAULT; | |
400 | } | |
401 | break; | |
402 | case 's':{ | |
e45c5405 | 403 | const char *sptr = va_arg(ap, const char *); |
219fd58b | 404 | uint16_t len = 0; |
e45c5405 | 405 | if (sptr) |
219fd58b MK |
406 | len = min_t(uint16_t, strlen(sptr), |
407 | USHRT_MAX); | |
ace51c4d | 408 | |
342fee1d SK |
409 | errcode = p9pdu_writef(pdu, proto_version, |
410 | "w", len); | |
e45c5405 | 411 | if (!errcode && pdu_write(pdu, sptr, len)) |
ace51c4d EVH |
412 | errcode = -EFAULT; |
413 | } | |
414 | break; | |
415 | case 'Q':{ | |
416 | const struct p9_qid *qid = | |
417 | va_arg(ap, const struct p9_qid *); | |
418 | errcode = | |
342fee1d | 419 | p9pdu_writef(pdu, proto_version, "bdq", |
ace51c4d EVH |
420 | qid->type, qid->version, |
421 | qid->path); | |
422 | } break; | |
423 | case 'S':{ | |
424 | const struct p9_wstat *stbuf = | |
425 | va_arg(ap, const struct p9_wstat *); | |
426 | errcode = | |
342fee1d | 427 | p9pdu_writef(pdu, proto_version, |
ace51c4d EVH |
428 | "wwdQdddqssss?sddd", |
429 | stbuf->size, stbuf->type, | |
51a87c55 | 430 | stbuf->dev, &stbuf->qid, |
ace51c4d EVH |
431 | stbuf->mode, stbuf->atime, |
432 | stbuf->mtime, stbuf->length, | |
433 | stbuf->name, stbuf->uid, | |
434 | stbuf->gid, stbuf->muid, | |
435 | stbuf->extension, stbuf->n_uid, | |
436 | stbuf->n_gid, stbuf->n_muid); | |
437 | } break; | |
438 | case 'D':{ | |
219fd58b | 439 | uint32_t count = va_arg(ap, uint32_t); |
ace51c4d EVH |
440 | const void *data = va_arg(ap, const void *); |
441 | ||
342fee1d SK |
442 | errcode = p9pdu_writef(pdu, proto_version, "d", |
443 | count); | |
ace51c4d EVH |
444 | if (!errcode && pdu_write(pdu, data, count)) |
445 | errcode = -EFAULT; | |
446 | } | |
447 | break; | |
51a87c55 EVH |
448 | case 'U':{ |
449 | int32_t count = va_arg(ap, int32_t); | |
450 | const char __user *udata = | |
e45c5405 | 451 | va_arg(ap, const void __user *); |
342fee1d SK |
452 | errcode = p9pdu_writef(pdu, proto_version, "d", |
453 | count); | |
51a87c55 EVH |
454 | if (!errcode && pdu_write_u(pdu, udata, count)) |
455 | errcode = -EFAULT; | |
456 | } | |
457 | break; | |
ace51c4d EVH |
458 | case 'T':{ |
459 | int16_t nwname = va_arg(ap, int); | |
460 | const char **wnames = va_arg(ap, const char **); | |
461 | ||
342fee1d SK |
462 | errcode = p9pdu_writef(pdu, proto_version, "w", |
463 | nwname); | |
ace51c4d EVH |
464 | if (!errcode) { |
465 | int i; | |
466 | ||
467 | for (i = 0; i < nwname; i++) { | |
468 | errcode = | |
342fee1d SK |
469 | p9pdu_writef(pdu, |
470 | proto_version, | |
ace51c4d EVH |
471 | "s", |
472 | wnames[i]); | |
473 | if (errcode) | |
474 | break; | |
475 | } | |
476 | } | |
477 | } | |
478 | break; | |
479 | case 'R':{ | |
480 | int16_t nwqid = va_arg(ap, int); | |
481 | struct p9_qid *wqids = | |
482 | va_arg(ap, struct p9_qid *); | |
483 | ||
342fee1d SK |
484 | errcode = p9pdu_writef(pdu, proto_version, "w", |
485 | nwqid); | |
ace51c4d EVH |
486 | if (!errcode) { |
487 | int i; | |
488 | ||
489 | for (i = 0; i < nwqid; i++) { | |
490 | errcode = | |
342fee1d SK |
491 | p9pdu_writef(pdu, |
492 | proto_version, | |
ace51c4d EVH |
493 | "Q", |
494 | &wqids[i]); | |
495 | if (errcode) | |
496 | break; | |
497 | } | |
498 | } | |
499 | } | |
500 | break; | |
87d7845a SK |
501 | case 'I':{ |
502 | struct p9_iattr_dotl *p9attr = va_arg(ap, | |
503 | struct p9_iattr_dotl *); | |
504 | ||
505 | errcode = p9pdu_writef(pdu, proto_version, | |
506 | "ddddqqqqq", | |
507 | p9attr->valid, | |
508 | p9attr->mode, | |
509 | p9attr->uid, | |
510 | p9attr->gid, | |
511 | p9attr->size, | |
512 | p9attr->atime_sec, | |
513 | p9attr->atime_nsec, | |
514 | p9attr->mtime_sec, | |
515 | p9attr->mtime_nsec); | |
516 | } | |
517 | break; | |
ace51c4d | 518 | case '?': |
c56e4acf SK |
519 | if ((proto_version != p9_proto_2000u) && |
520 | (proto_version != p9_proto_2000L)) | |
ace51c4d EVH |
521 | return 0; |
522 | break; | |
523 | default: | |
524 | BUG(); | |
525 | break; | |
526 | } | |
527 | ||
528 | if (errcode) | |
529 | break; | |
530 | } | |
531 | ||
532 | return errcode; | |
533 | } | |
534 | ||
342fee1d | 535 | int p9pdu_readf(struct p9_fcall *pdu, int proto_version, const char *fmt, ...) |
ace51c4d EVH |
536 | { |
537 | va_list ap; | |
538 | int ret; | |
539 | ||
540 | va_start(ap, fmt); | |
342fee1d | 541 | ret = p9pdu_vreadf(pdu, proto_version, fmt, ap); |
ace51c4d EVH |
542 | va_end(ap); |
543 | ||
544 | return ret; | |
545 | } | |
546 | ||
547 | static int | |
342fee1d | 548 | p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...) |
ace51c4d EVH |
549 | { |
550 | va_list ap; | |
551 | int ret; | |
552 | ||
553 | va_start(ap, fmt); | |
342fee1d | 554 | ret = p9pdu_vwritef(pdu, proto_version, fmt, ap); |
ace51c4d EVH |
555 | va_end(ap); |
556 | ||
557 | return ret; | |
558 | } | |
51a87c55 | 559 | |
342fee1d | 560 | int p9stat_read(char *buf, int len, struct p9_wstat *st, int proto_version) |
02da398b EVH |
561 | { |
562 | struct p9_fcall fake_pdu; | |
e7f4b8f1 | 563 | int ret; |
02da398b EVH |
564 | |
565 | fake_pdu.size = len; | |
566 | fake_pdu.capacity = len; | |
567 | fake_pdu.sdata = buf; | |
568 | fake_pdu.offset = 0; | |
569 | ||
342fee1d | 570 | ret = p9pdu_readf(&fake_pdu, proto_version, "S", st); |
e7f4b8f1 EVH |
571 | if (ret) { |
572 | P9_DPRINTK(P9_DEBUG_9P, "<<< p9stat_read failed: %d\n", ret); | |
573 | p9pdu_dump(1, &fake_pdu); | |
574 | } | |
575 | ||
576 | return ret; | |
02da398b EVH |
577 | } |
578 | EXPORT_SYMBOL(p9stat_read); | |
579 | ||
51a87c55 EVH |
580 | int p9pdu_prepare(struct p9_fcall *pdu, int16_t tag, int8_t type) |
581 | { | |
582 | return p9pdu_writef(pdu, 0, "dbw", 0, type, tag); | |
583 | } | |
584 | ||
585 | int p9pdu_finalize(struct p9_fcall *pdu) | |
586 | { | |
587 | int size = pdu->size; | |
588 | int err; | |
589 | ||
590 | pdu->size = 0; | |
591 | err = p9pdu_writef(pdu, 0, "d", size); | |
592 | pdu->size = size; | |
593 | ||
0b15a3a5 | 594 | #ifdef CONFIG_NET_9P_DEBUG |
e7f4b8f1 | 595 | if ((p9_debug_level & P9_DEBUG_PKT) == P9_DEBUG_PKT) |
51a87c55 | 596 | p9pdu_dump(0, pdu); |
0b15a3a5 | 597 | #endif |
51a87c55 | 598 | |
e7f4b8f1 EVH |
599 | P9_DPRINTK(P9_DEBUG_9P, ">>> size=%d type: %d tag: %d\n", pdu->size, |
600 | pdu->id, pdu->tag); | |
601 | ||
51a87c55 EVH |
602 | return err; |
603 | } | |
604 | ||
605 | void p9pdu_reset(struct p9_fcall *pdu) | |
606 | { | |
607 | pdu->offset = 0; | |
608 | pdu->size = 0; | |
609 | } | |
7751bdb3 SK |
610 | |
611 | int p9dirent_read(char *buf, int len, struct p9_dirent *dirent, | |
612 | int proto_version) | |
613 | { | |
614 | struct p9_fcall fake_pdu; | |
615 | int ret; | |
616 | char *nameptr; | |
617 | ||
618 | fake_pdu.size = len; | |
619 | fake_pdu.capacity = len; | |
620 | fake_pdu.sdata = buf; | |
621 | fake_pdu.offset = 0; | |
622 | ||
623 | ret = p9pdu_readf(&fake_pdu, proto_version, "Qqbs", &dirent->qid, | |
624 | &dirent->d_off, &dirent->d_type, &nameptr); | |
625 | if (ret) { | |
626 | P9_DPRINTK(P9_DEBUG_9P, "<<< p9dirent_read failed: %d\n", ret); | |
627 | p9pdu_dump(1, &fake_pdu); | |
628 | goto out; | |
629 | } | |
630 | ||
631 | strcpy(dirent->d_name, nameptr); | |
632 | ||
633 | out: | |
634 | return fake_pdu.offset; | |
635 | } | |
636 | EXPORT_SYMBOL(p9dirent_read); |