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 | ||
348b5901 AK |
40 | #include <trace/events/9p.h> |
41 | ||
ace51c4d | 42 | static int |
342fee1d | 43 | p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...); |
ace51c4d EVH |
44 | |
45 | void p9stat_free(struct p9_wstat *stbuf) | |
46 | { | |
47 | kfree(stbuf->name); | |
48 | kfree(stbuf->uid); | |
49 | kfree(stbuf->gid); | |
50 | kfree(stbuf->muid); | |
51 | kfree(stbuf->extension); | |
52 | } | |
53 | EXPORT_SYMBOL(p9stat_free); | |
54 | ||
abfa034e | 55 | size_t pdu_read(struct p9_fcall *pdu, void *data, size_t size) |
ace51c4d | 56 | { |
01b0c5cf | 57 | size_t len = min(pdu->size - pdu->offset, size); |
ace51c4d EVH |
58 | memcpy(data, &pdu->sdata[pdu->offset], len); |
59 | pdu->offset += len; | |
60 | return size - len; | |
61 | } | |
62 | ||
63 | static size_t pdu_write(struct p9_fcall *pdu, const void *data, size_t size) | |
64 | { | |
01b0c5cf | 65 | size_t len = min(pdu->capacity - pdu->size, size); |
ace51c4d EVH |
66 | memcpy(&pdu->sdata[pdu->size], data, len); |
67 | pdu->size += len; | |
68 | return size - len; | |
69 | } | |
70 | ||
51a87c55 EVH |
71 | static size_t |
72 | pdu_write_u(struct p9_fcall *pdu, const char __user *udata, size_t size) | |
73 | { | |
01b0c5cf | 74 | size_t len = min(pdu->capacity - pdu->size, size); |
7b3bb3fe AK |
75 | if (copy_from_user(&pdu->sdata[pdu->size], udata, len)) |
76 | len = 0; | |
51a87c55 EVH |
77 | |
78 | pdu->size += len; | |
79 | return size - len; | |
80 | } | |
81 | ||
ace51c4d EVH |
82 | /* |
83 | b - int8_t | |
84 | w - int16_t | |
85 | d - int32_t | |
86 | q - int64_t | |
87 | s - string | |
88 | S - stat | |
89 | Q - qid | |
90 | D - data blob (int32_t size followed by void *, results are not freed) | |
91 | T - array of strings (int16_t count, followed by strings) | |
92 | R - array of qids (int16_t count, followed by qids) | |
f0853122 | 93 | A - stat for 9p2000.L (p9_stat_dotl) |
ace51c4d EVH |
94 | ? - if optional = 1, continue parsing |
95 | */ | |
96 | ||
97 | static int | |
342fee1d SK |
98 | p9pdu_vreadf(struct p9_fcall *pdu, int proto_version, const char *fmt, |
99 | va_list ap) | |
ace51c4d EVH |
100 | { |
101 | const char *ptr; | |
102 | int errcode = 0; | |
103 | ||
104 | for (ptr = fmt; *ptr; ptr++) { | |
105 | switch (*ptr) { | |
106 | case 'b':{ | |
107 | int8_t *val = va_arg(ap, int8_t *); | |
108 | if (pdu_read(pdu, val, sizeof(*val))) { | |
109 | errcode = -EFAULT; | |
110 | break; | |
111 | } | |
112 | } | |
113 | break; | |
114 | case 'w':{ | |
115 | int16_t *val = va_arg(ap, int16_t *); | |
beeebc92 EVH |
116 | __le16 le_val; |
117 | if (pdu_read(pdu, &le_val, sizeof(le_val))) { | |
ace51c4d EVH |
118 | errcode = -EFAULT; |
119 | break; | |
120 | } | |
beeebc92 | 121 | *val = le16_to_cpu(le_val); |
ace51c4d EVH |
122 | } |
123 | break; | |
124 | case 'd':{ | |
125 | int32_t *val = va_arg(ap, int32_t *); | |
beeebc92 EVH |
126 | __le32 le_val; |
127 | if (pdu_read(pdu, &le_val, sizeof(le_val))) { | |
ace51c4d EVH |
128 | errcode = -EFAULT; |
129 | break; | |
130 | } | |
beeebc92 | 131 | *val = le32_to_cpu(le_val); |
ace51c4d EVH |
132 | } |
133 | break; | |
134 | case 'q':{ | |
135 | int64_t *val = va_arg(ap, int64_t *); | |
beeebc92 EVH |
136 | __le64 le_val; |
137 | if (pdu_read(pdu, &le_val, sizeof(le_val))) { | |
ace51c4d EVH |
138 | errcode = -EFAULT; |
139 | break; | |
140 | } | |
beeebc92 | 141 | *val = le64_to_cpu(le_val); |
ace51c4d EVH |
142 | } |
143 | break; | |
144 | case 's':{ | |
e45c5405 | 145 | char **sptr = va_arg(ap, char **); |
219fd58b | 146 | uint16_t len; |
ace51c4d | 147 | |
342fee1d SK |
148 | errcode = p9pdu_readf(pdu, proto_version, |
149 | "w", &len); | |
ace51c4d EVH |
150 | if (errcode) |
151 | break; | |
152 | ||
eeff66ef | 153 | *sptr = kmalloc(len + 1, GFP_NOFS); |
e45c5405 | 154 | if (*sptr == NULL) { |
ace51c4d EVH |
155 | errcode = -EFAULT; |
156 | break; | |
157 | } | |
219fd58b | 158 | if (pdu_read(pdu, *sptr, len)) { |
ace51c4d | 159 | errcode = -EFAULT; |
e45c5405 EVH |
160 | kfree(*sptr); |
161 | *sptr = NULL; | |
ace51c4d | 162 | } else |
219fd58b | 163 | (*sptr)[len] = 0; |
ace51c4d EVH |
164 | } |
165 | break; | |
166 | case 'Q':{ | |
167 | struct p9_qid *qid = | |
168 | va_arg(ap, struct p9_qid *); | |
169 | ||
342fee1d | 170 | errcode = p9pdu_readf(pdu, proto_version, "bdq", |
ace51c4d EVH |
171 | &qid->type, &qid->version, |
172 | &qid->path); | |
173 | } | |
174 | break; | |
175 | case 'S':{ | |
176 | struct p9_wstat *stbuf = | |
177 | va_arg(ap, struct p9_wstat *); | |
178 | ||
f0a0ac2e | 179 | memset(stbuf, 0, sizeof(struct p9_wstat)); |
ace51c4d | 180 | stbuf->n_uid = stbuf->n_gid = stbuf->n_muid = |
f0a0ac2e | 181 | -1; |
ace51c4d | 182 | errcode = |
342fee1d | 183 | p9pdu_readf(pdu, proto_version, |
ace51c4d EVH |
184 | "wwdQdddqssss?sddd", |
185 | &stbuf->size, &stbuf->type, | |
186 | &stbuf->dev, &stbuf->qid, | |
187 | &stbuf->mode, &stbuf->atime, | |
188 | &stbuf->mtime, &stbuf->length, | |
189 | &stbuf->name, &stbuf->uid, | |
190 | &stbuf->gid, &stbuf->muid, | |
191 | &stbuf->extension, | |
192 | &stbuf->n_uid, &stbuf->n_gid, | |
193 | &stbuf->n_muid); | |
194 | if (errcode) | |
195 | p9stat_free(stbuf); | |
196 | } | |
197 | break; | |
198 | case 'D':{ | |
219fd58b | 199 | uint32_t *count = va_arg(ap, uint32_t *); |
ace51c4d EVH |
200 | void **data = va_arg(ap, void **); |
201 | ||
202 | errcode = | |
342fee1d | 203 | p9pdu_readf(pdu, proto_version, "d", count); |
ace51c4d EVH |
204 | if (!errcode) { |
205 | *count = | |
219fd58b | 206 | min_t(uint32_t, *count, |
01b0c5cf | 207 | pdu->size - pdu->offset); |
ace51c4d EVH |
208 | *data = &pdu->sdata[pdu->offset]; |
209 | } | |
210 | } | |
211 | break; | |
212 | case 'T':{ | |
b76225e2 | 213 | uint16_t *nwname = va_arg(ap, uint16_t *); |
ace51c4d EVH |
214 | char ***wnames = va_arg(ap, char ***); |
215 | ||
342fee1d SK |
216 | errcode = p9pdu_readf(pdu, proto_version, |
217 | "w", nwname); | |
ace51c4d EVH |
218 | if (!errcode) { |
219 | *wnames = | |
220 | kmalloc(sizeof(char *) * *nwname, | |
eeff66ef | 221 | GFP_NOFS); |
ace51c4d EVH |
222 | if (!*wnames) |
223 | errcode = -ENOMEM; | |
224 | } | |
225 | ||
226 | if (!errcode) { | |
227 | int i; | |
228 | ||
229 | for (i = 0; i < *nwname; i++) { | |
230 | errcode = | |
342fee1d SK |
231 | p9pdu_readf(pdu, |
232 | proto_version, | |
ace51c4d EVH |
233 | "s", |
234 | &(*wnames)[i]); | |
235 | if (errcode) | |
236 | break; | |
237 | } | |
238 | } | |
239 | ||
240 | if (errcode) { | |
241 | if (*wnames) { | |
242 | int i; | |
243 | ||
244 | for (i = 0; i < *nwname; i++) | |
245 | kfree((*wnames)[i]); | |
246 | } | |
247 | kfree(*wnames); | |
248 | *wnames = NULL; | |
249 | } | |
250 | } | |
251 | break; | |
252 | case 'R':{ | |
253 | int16_t *nwqid = va_arg(ap, int16_t *); | |
254 | struct p9_qid **wqids = | |
255 | va_arg(ap, struct p9_qid **); | |
256 | ||
257 | *wqids = NULL; | |
258 | ||
259 | errcode = | |
342fee1d | 260 | p9pdu_readf(pdu, proto_version, "w", nwqid); |
ace51c4d EVH |
261 | if (!errcode) { |
262 | *wqids = | |
263 | kmalloc(*nwqid * | |
264 | sizeof(struct p9_qid), | |
eeff66ef | 265 | GFP_NOFS); |
ace51c4d EVH |
266 | if (*wqids == NULL) |
267 | errcode = -ENOMEM; | |
268 | } | |
269 | ||
270 | if (!errcode) { | |
271 | int i; | |
272 | ||
273 | for (i = 0; i < *nwqid; i++) { | |
274 | errcode = | |
342fee1d SK |
275 | p9pdu_readf(pdu, |
276 | proto_version, | |
ace51c4d EVH |
277 | "Q", |
278 | &(*wqids)[i]); | |
279 | if (errcode) | |
280 | break; | |
281 | } | |
282 | } | |
283 | ||
284 | if (errcode) { | |
285 | kfree(*wqids); | |
286 | *wqids = NULL; | |
287 | } | |
288 | } | |
289 | break; | |
f0853122 SK |
290 | case 'A': { |
291 | struct p9_stat_dotl *stbuf = | |
292 | va_arg(ap, struct p9_stat_dotl *); | |
293 | ||
294 | memset(stbuf, 0, sizeof(struct p9_stat_dotl)); | |
295 | errcode = | |
296 | p9pdu_readf(pdu, proto_version, | |
297 | "qQdddqqqqqqqqqqqqqqq", | |
298 | &stbuf->st_result_mask, | |
299 | &stbuf->qid, | |
300 | &stbuf->st_mode, | |
301 | &stbuf->st_uid, &stbuf->st_gid, | |
302 | &stbuf->st_nlink, | |
303 | &stbuf->st_rdev, &stbuf->st_size, | |
304 | &stbuf->st_blksize, &stbuf->st_blocks, | |
305 | &stbuf->st_atime_sec, | |
306 | &stbuf->st_atime_nsec, | |
307 | &stbuf->st_mtime_sec, | |
308 | &stbuf->st_mtime_nsec, | |
309 | &stbuf->st_ctime_sec, | |
310 | &stbuf->st_ctime_nsec, | |
311 | &stbuf->st_btime_sec, | |
312 | &stbuf->st_btime_nsec, | |
313 | &stbuf->st_gen, | |
314 | &stbuf->st_data_version); | |
315 | } | |
316 | break; | |
ace51c4d | 317 | case '?': |
c56e4acf SK |
318 | if ((proto_version != p9_proto_2000u) && |
319 | (proto_version != p9_proto_2000L)) | |
ace51c4d EVH |
320 | return 0; |
321 | break; | |
322 | default: | |
323 | BUG(); | |
324 | break; | |
325 | } | |
326 | ||
327 | if (errcode) | |
328 | break; | |
329 | } | |
330 | ||
331 | return errcode; | |
332 | } | |
333 | ||
334 | int | |
342fee1d SK |
335 | p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt, |
336 | va_list ap) | |
ace51c4d EVH |
337 | { |
338 | const char *ptr; | |
339 | int errcode = 0; | |
340 | ||
341 | for (ptr = fmt; *ptr; ptr++) { | |
342 | switch (*ptr) { | |
343 | case 'b':{ | |
344 | int8_t val = va_arg(ap, int); | |
345 | if (pdu_write(pdu, &val, sizeof(val))) | |
346 | errcode = -EFAULT; | |
347 | } | |
348 | break; | |
349 | case 'w':{ | |
beeebc92 | 350 | __le16 val = cpu_to_le16(va_arg(ap, int)); |
ace51c4d EVH |
351 | if (pdu_write(pdu, &val, sizeof(val))) |
352 | errcode = -EFAULT; | |
353 | } | |
354 | break; | |
355 | case 'd':{ | |
beeebc92 | 356 | __le32 val = cpu_to_le32(va_arg(ap, int32_t)); |
ace51c4d EVH |
357 | if (pdu_write(pdu, &val, sizeof(val))) |
358 | errcode = -EFAULT; | |
359 | } | |
360 | break; | |
361 | case 'q':{ | |
beeebc92 | 362 | __le64 val = cpu_to_le64(va_arg(ap, int64_t)); |
ace51c4d EVH |
363 | if (pdu_write(pdu, &val, sizeof(val))) |
364 | errcode = -EFAULT; | |
365 | } | |
366 | break; | |
367 | case 's':{ | |
e45c5405 | 368 | const char *sptr = va_arg(ap, const char *); |
219fd58b | 369 | uint16_t len = 0; |
e45c5405 | 370 | if (sptr) |
219fd58b MK |
371 | len = min_t(uint16_t, strlen(sptr), |
372 | USHRT_MAX); | |
ace51c4d | 373 | |
342fee1d SK |
374 | errcode = p9pdu_writef(pdu, proto_version, |
375 | "w", len); | |
e45c5405 | 376 | if (!errcode && pdu_write(pdu, sptr, len)) |
ace51c4d EVH |
377 | errcode = -EFAULT; |
378 | } | |
379 | break; | |
380 | case 'Q':{ | |
381 | const struct p9_qid *qid = | |
382 | va_arg(ap, const struct p9_qid *); | |
383 | errcode = | |
342fee1d | 384 | p9pdu_writef(pdu, proto_version, "bdq", |
ace51c4d EVH |
385 | qid->type, qid->version, |
386 | qid->path); | |
387 | } break; | |
388 | case 'S':{ | |
389 | const struct p9_wstat *stbuf = | |
390 | va_arg(ap, const struct p9_wstat *); | |
391 | errcode = | |
342fee1d | 392 | p9pdu_writef(pdu, proto_version, |
ace51c4d EVH |
393 | "wwdQdddqssss?sddd", |
394 | stbuf->size, stbuf->type, | |
51a87c55 | 395 | stbuf->dev, &stbuf->qid, |
ace51c4d EVH |
396 | stbuf->mode, stbuf->atime, |
397 | stbuf->mtime, stbuf->length, | |
398 | stbuf->name, stbuf->uid, | |
399 | stbuf->gid, stbuf->muid, | |
400 | stbuf->extension, stbuf->n_uid, | |
401 | stbuf->n_gid, stbuf->n_muid); | |
402 | } break; | |
403 | case 'D':{ | |
219fd58b | 404 | uint32_t count = va_arg(ap, uint32_t); |
ace51c4d EVH |
405 | const void *data = va_arg(ap, const void *); |
406 | ||
342fee1d SK |
407 | errcode = p9pdu_writef(pdu, proto_version, "d", |
408 | count); | |
ace51c4d EVH |
409 | if (!errcode && pdu_write(pdu, data, count)) |
410 | errcode = -EFAULT; | |
411 | } | |
412 | break; | |
51a87c55 EVH |
413 | case 'U':{ |
414 | int32_t count = va_arg(ap, int32_t); | |
415 | const char __user *udata = | |
e45c5405 | 416 | va_arg(ap, const void __user *); |
342fee1d SK |
417 | errcode = p9pdu_writef(pdu, proto_version, "d", |
418 | count); | |
51a87c55 EVH |
419 | if (!errcode && pdu_write_u(pdu, udata, count)) |
420 | errcode = -EFAULT; | |
421 | } | |
422 | break; | |
ace51c4d | 423 | case 'T':{ |
b76225e2 | 424 | uint16_t nwname = va_arg(ap, int); |
ace51c4d EVH |
425 | const char **wnames = va_arg(ap, const char **); |
426 | ||
342fee1d SK |
427 | errcode = p9pdu_writef(pdu, proto_version, "w", |
428 | nwname); | |
ace51c4d EVH |
429 | if (!errcode) { |
430 | int i; | |
431 | ||
432 | for (i = 0; i < nwname; i++) { | |
433 | errcode = | |
342fee1d SK |
434 | p9pdu_writef(pdu, |
435 | proto_version, | |
ace51c4d EVH |
436 | "s", |
437 | wnames[i]); | |
438 | if (errcode) | |
439 | break; | |
440 | } | |
441 | } | |
442 | } | |
443 | break; | |
444 | case 'R':{ | |
445 | int16_t nwqid = va_arg(ap, int); | |
446 | struct p9_qid *wqids = | |
447 | va_arg(ap, struct p9_qid *); | |
448 | ||
342fee1d SK |
449 | errcode = p9pdu_writef(pdu, proto_version, "w", |
450 | nwqid); | |
ace51c4d EVH |
451 | if (!errcode) { |
452 | int i; | |
453 | ||
454 | for (i = 0; i < nwqid; i++) { | |
455 | errcode = | |
342fee1d SK |
456 | p9pdu_writef(pdu, |
457 | proto_version, | |
ace51c4d EVH |
458 | "Q", |
459 | &wqids[i]); | |
460 | if (errcode) | |
461 | break; | |
462 | } | |
463 | } | |
464 | } | |
465 | break; | |
87d7845a SK |
466 | case 'I':{ |
467 | struct p9_iattr_dotl *p9attr = va_arg(ap, | |
468 | struct p9_iattr_dotl *); | |
469 | ||
470 | errcode = p9pdu_writef(pdu, proto_version, | |
471 | "ddddqqqqq", | |
472 | p9attr->valid, | |
473 | p9attr->mode, | |
474 | p9attr->uid, | |
475 | p9attr->gid, | |
476 | p9attr->size, | |
477 | p9attr->atime_sec, | |
478 | p9attr->atime_nsec, | |
479 | p9attr->mtime_sec, | |
480 | p9attr->mtime_nsec); | |
481 | } | |
482 | break; | |
ace51c4d | 483 | case '?': |
c56e4acf SK |
484 | if ((proto_version != p9_proto_2000u) && |
485 | (proto_version != p9_proto_2000L)) | |
ace51c4d EVH |
486 | return 0; |
487 | break; | |
488 | default: | |
489 | BUG(); | |
490 | break; | |
491 | } | |
492 | ||
493 | if (errcode) | |
494 | break; | |
495 | } | |
496 | ||
497 | return errcode; | |
498 | } | |
499 | ||
342fee1d | 500 | int p9pdu_readf(struct p9_fcall *pdu, int proto_version, const char *fmt, ...) |
ace51c4d EVH |
501 | { |
502 | va_list ap; | |
503 | int ret; | |
504 | ||
505 | va_start(ap, fmt); | |
342fee1d | 506 | ret = p9pdu_vreadf(pdu, proto_version, fmt, ap); |
ace51c4d EVH |
507 | va_end(ap); |
508 | ||
509 | return ret; | |
510 | } | |
511 | ||
512 | static int | |
342fee1d | 513 | p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...) |
ace51c4d EVH |
514 | { |
515 | va_list ap; | |
516 | int ret; | |
517 | ||
518 | va_start(ap, fmt); | |
342fee1d | 519 | ret = p9pdu_vwritef(pdu, proto_version, fmt, ap); |
ace51c4d EVH |
520 | va_end(ap); |
521 | ||
522 | return ret; | |
523 | } | |
51a87c55 | 524 | |
348b5901 | 525 | int p9stat_read(struct p9_client *clnt, char *buf, int len, struct p9_wstat *st) |
02da398b EVH |
526 | { |
527 | struct p9_fcall fake_pdu; | |
e7f4b8f1 | 528 | int ret; |
02da398b EVH |
529 | |
530 | fake_pdu.size = len; | |
531 | fake_pdu.capacity = len; | |
532 | fake_pdu.sdata = buf; | |
533 | fake_pdu.offset = 0; | |
534 | ||
348b5901 | 535 | ret = p9pdu_readf(&fake_pdu, clnt->proto_version, "S", st); |
e7f4b8f1 EVH |
536 | if (ret) { |
537 | P9_DPRINTK(P9_DEBUG_9P, "<<< p9stat_read failed: %d\n", ret); | |
348b5901 | 538 | trace_9p_protocol_dump(clnt, &fake_pdu); |
e7f4b8f1 EVH |
539 | } |
540 | ||
541 | return ret; | |
02da398b EVH |
542 | } |
543 | EXPORT_SYMBOL(p9stat_read); | |
544 | ||
51a87c55 EVH |
545 | int p9pdu_prepare(struct p9_fcall *pdu, int16_t tag, int8_t type) |
546 | { | |
9bb6c10a | 547 | pdu->id = type; |
51a87c55 EVH |
548 | return p9pdu_writef(pdu, 0, "dbw", 0, type, tag); |
549 | } | |
550 | ||
348b5901 | 551 | int p9pdu_finalize(struct p9_client *clnt, struct p9_fcall *pdu) |
51a87c55 EVH |
552 | { |
553 | int size = pdu->size; | |
554 | int err; | |
555 | ||
556 | pdu->size = 0; | |
557 | err = p9pdu_writef(pdu, 0, "d", size); | |
558 | pdu->size = size; | |
559 | ||
348b5901 | 560 | trace_9p_protocol_dump(clnt, pdu); |
e7f4b8f1 EVH |
561 | P9_DPRINTK(P9_DEBUG_9P, ">>> size=%d type: %d tag: %d\n", pdu->size, |
562 | pdu->id, pdu->tag); | |
563 | ||
51a87c55 EVH |
564 | return err; |
565 | } | |
566 | ||
567 | void p9pdu_reset(struct p9_fcall *pdu) | |
568 | { | |
569 | pdu->offset = 0; | |
570 | pdu->size = 0; | |
571 | } | |
7751bdb3 | 572 | |
348b5901 AK |
573 | int p9dirent_read(struct p9_client *clnt, char *buf, int len, |
574 | struct p9_dirent *dirent) | |
7751bdb3 SK |
575 | { |
576 | struct p9_fcall fake_pdu; | |
577 | int ret; | |
578 | char *nameptr; | |
579 | ||
580 | fake_pdu.size = len; | |
581 | fake_pdu.capacity = len; | |
582 | fake_pdu.sdata = buf; | |
583 | fake_pdu.offset = 0; | |
584 | ||
348b5901 AK |
585 | ret = p9pdu_readf(&fake_pdu, clnt->proto_version, "Qqbs", &dirent->qid, |
586 | &dirent->d_off, &dirent->d_type, &nameptr); | |
7751bdb3 SK |
587 | if (ret) { |
588 | P9_DPRINTK(P9_DEBUG_9P, "<<< p9dirent_read failed: %d\n", ret); | |
348b5901 | 589 | trace_9p_protocol_dump(clnt, &fake_pdu); |
7751bdb3 SK |
590 | goto out; |
591 | } | |
592 | ||
593 | strcpy(dirent->d_name, nameptr); | |
1b0bcbcf | 594 | kfree(nameptr); |
7751bdb3 SK |
595 | |
596 | out: | |
597 | return fake_pdu.offset; | |
598 | } | |
599 | EXPORT_SYMBOL(p9dirent_read); |