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 | |
97fc8b1e EB |
88 | u - numeric uid |
89 | g - numeric gid | |
ace51c4d EVH |
90 | S - stat |
91 | Q - qid | |
92 | D - data blob (int32_t size followed by void *, results are not freed) | |
93 | T - array of strings (int16_t count, followed by strings) | |
94 | R - array of qids (int16_t count, followed by qids) | |
f0853122 | 95 | A - stat for 9p2000.L (p9_stat_dotl) |
ace51c4d EVH |
96 | ? - if optional = 1, continue parsing |
97 | */ | |
98 | ||
99 | static int | |
342fee1d SK |
100 | p9pdu_vreadf(struct p9_fcall *pdu, int proto_version, const char *fmt, |
101 | va_list ap) | |
ace51c4d EVH |
102 | { |
103 | const char *ptr; | |
104 | int errcode = 0; | |
105 | ||
106 | for (ptr = fmt; *ptr; ptr++) { | |
107 | switch (*ptr) { | |
108 | case 'b':{ | |
109 | int8_t *val = va_arg(ap, int8_t *); | |
110 | if (pdu_read(pdu, val, sizeof(*val))) { | |
111 | errcode = -EFAULT; | |
112 | break; | |
113 | } | |
114 | } | |
115 | break; | |
116 | case 'w':{ | |
117 | int16_t *val = va_arg(ap, int16_t *); | |
beeebc92 EVH |
118 | __le16 le_val; |
119 | if (pdu_read(pdu, &le_val, sizeof(le_val))) { | |
ace51c4d EVH |
120 | errcode = -EFAULT; |
121 | break; | |
122 | } | |
beeebc92 | 123 | *val = le16_to_cpu(le_val); |
ace51c4d EVH |
124 | } |
125 | break; | |
126 | case 'd':{ | |
127 | int32_t *val = va_arg(ap, int32_t *); | |
beeebc92 EVH |
128 | __le32 le_val; |
129 | if (pdu_read(pdu, &le_val, sizeof(le_val))) { | |
ace51c4d EVH |
130 | errcode = -EFAULT; |
131 | break; | |
132 | } | |
beeebc92 | 133 | *val = le32_to_cpu(le_val); |
ace51c4d EVH |
134 | } |
135 | break; | |
136 | case 'q':{ | |
137 | int64_t *val = va_arg(ap, int64_t *); | |
beeebc92 EVH |
138 | __le64 le_val; |
139 | if (pdu_read(pdu, &le_val, sizeof(le_val))) { | |
ace51c4d EVH |
140 | errcode = -EFAULT; |
141 | break; | |
142 | } | |
beeebc92 | 143 | *val = le64_to_cpu(le_val); |
ace51c4d EVH |
144 | } |
145 | break; | |
146 | case 's':{ | |
e45c5405 | 147 | char **sptr = va_arg(ap, char **); |
219fd58b | 148 | uint16_t len; |
ace51c4d | 149 | |
342fee1d SK |
150 | errcode = p9pdu_readf(pdu, proto_version, |
151 | "w", &len); | |
ace51c4d EVH |
152 | if (errcode) |
153 | break; | |
154 | ||
eeff66ef | 155 | *sptr = kmalloc(len + 1, GFP_NOFS); |
e45c5405 | 156 | if (*sptr == NULL) { |
ace51c4d EVH |
157 | errcode = -EFAULT; |
158 | break; | |
159 | } | |
219fd58b | 160 | if (pdu_read(pdu, *sptr, len)) { |
ace51c4d | 161 | errcode = -EFAULT; |
e45c5405 EVH |
162 | kfree(*sptr); |
163 | *sptr = NULL; | |
ace51c4d | 164 | } else |
219fd58b | 165 | (*sptr)[len] = 0; |
ace51c4d EVH |
166 | } |
167 | break; | |
97fc8b1e EB |
168 | case 'u': { |
169 | kuid_t *uid = va_arg(ap, kuid_t *); | |
170 | __le32 le_val; | |
171 | if (pdu_read(pdu, &le_val, sizeof(le_val))) { | |
172 | errcode = -EFAULT; | |
173 | break; | |
174 | } | |
175 | *uid = make_kuid(&init_user_ns, | |
176 | le32_to_cpu(le_val)); | |
177 | } break; | |
178 | case 'g': { | |
179 | kgid_t *gid = va_arg(ap, kgid_t *); | |
180 | __le32 le_val; | |
181 | if (pdu_read(pdu, &le_val, sizeof(le_val))) { | |
182 | errcode = -EFAULT; | |
183 | break; | |
184 | } | |
185 | *gid = make_kgid(&init_user_ns, | |
186 | le32_to_cpu(le_val)); | |
187 | } break; | |
ace51c4d EVH |
188 | case 'Q':{ |
189 | struct p9_qid *qid = | |
190 | va_arg(ap, struct p9_qid *); | |
191 | ||
342fee1d | 192 | errcode = p9pdu_readf(pdu, proto_version, "bdq", |
ace51c4d EVH |
193 | &qid->type, &qid->version, |
194 | &qid->path); | |
195 | } | |
196 | break; | |
197 | case 'S':{ | |
198 | struct p9_wstat *stbuf = | |
199 | va_arg(ap, struct p9_wstat *); | |
200 | ||
f0a0ac2e | 201 | memset(stbuf, 0, sizeof(struct p9_wstat)); |
447c5094 EB |
202 | stbuf->n_uid = stbuf->n_muid = INVALID_UID; |
203 | stbuf->n_gid = INVALID_GID; | |
204 | ||
ace51c4d | 205 | errcode = |
342fee1d | 206 | p9pdu_readf(pdu, proto_version, |
447c5094 | 207 | "wwdQdddqssss?sugu", |
ace51c4d EVH |
208 | &stbuf->size, &stbuf->type, |
209 | &stbuf->dev, &stbuf->qid, | |
210 | &stbuf->mode, &stbuf->atime, | |
211 | &stbuf->mtime, &stbuf->length, | |
212 | &stbuf->name, &stbuf->uid, | |
213 | &stbuf->gid, &stbuf->muid, | |
214 | &stbuf->extension, | |
215 | &stbuf->n_uid, &stbuf->n_gid, | |
216 | &stbuf->n_muid); | |
217 | if (errcode) | |
218 | p9stat_free(stbuf); | |
219 | } | |
220 | break; | |
221 | case 'D':{ | |
219fd58b | 222 | uint32_t *count = va_arg(ap, uint32_t *); |
ace51c4d EVH |
223 | void **data = va_arg(ap, void **); |
224 | ||
225 | errcode = | |
342fee1d | 226 | p9pdu_readf(pdu, proto_version, "d", count); |
ace51c4d EVH |
227 | if (!errcode) { |
228 | *count = | |
219fd58b | 229 | min_t(uint32_t, *count, |
01b0c5cf | 230 | pdu->size - pdu->offset); |
ace51c4d EVH |
231 | *data = &pdu->sdata[pdu->offset]; |
232 | } | |
233 | } | |
234 | break; | |
235 | case 'T':{ | |
b76225e2 | 236 | uint16_t *nwname = va_arg(ap, uint16_t *); |
ace51c4d EVH |
237 | char ***wnames = va_arg(ap, char ***); |
238 | ||
342fee1d SK |
239 | errcode = p9pdu_readf(pdu, proto_version, |
240 | "w", nwname); | |
ace51c4d EVH |
241 | if (!errcode) { |
242 | *wnames = | |
243 | kmalloc(sizeof(char *) * *nwname, | |
eeff66ef | 244 | GFP_NOFS); |
ace51c4d EVH |
245 | if (!*wnames) |
246 | errcode = -ENOMEM; | |
247 | } | |
248 | ||
249 | if (!errcode) { | |
250 | int i; | |
251 | ||
252 | for (i = 0; i < *nwname; i++) { | |
253 | errcode = | |
342fee1d SK |
254 | p9pdu_readf(pdu, |
255 | proto_version, | |
ace51c4d EVH |
256 | "s", |
257 | &(*wnames)[i]); | |
258 | if (errcode) | |
259 | break; | |
260 | } | |
261 | } | |
262 | ||
263 | if (errcode) { | |
264 | if (*wnames) { | |
265 | int i; | |
266 | ||
267 | for (i = 0; i < *nwname; i++) | |
268 | kfree((*wnames)[i]); | |
269 | } | |
270 | kfree(*wnames); | |
271 | *wnames = NULL; | |
272 | } | |
273 | } | |
274 | break; | |
275 | case 'R':{ | |
276 | int16_t *nwqid = va_arg(ap, int16_t *); | |
277 | struct p9_qid **wqids = | |
278 | va_arg(ap, struct p9_qid **); | |
279 | ||
280 | *wqids = NULL; | |
281 | ||
282 | errcode = | |
342fee1d | 283 | p9pdu_readf(pdu, proto_version, "w", nwqid); |
ace51c4d EVH |
284 | if (!errcode) { |
285 | *wqids = | |
286 | kmalloc(*nwqid * | |
287 | sizeof(struct p9_qid), | |
eeff66ef | 288 | GFP_NOFS); |
ace51c4d EVH |
289 | if (*wqids == NULL) |
290 | errcode = -ENOMEM; | |
291 | } | |
292 | ||
293 | if (!errcode) { | |
294 | int i; | |
295 | ||
296 | for (i = 0; i < *nwqid; i++) { | |
297 | errcode = | |
342fee1d SK |
298 | p9pdu_readf(pdu, |
299 | proto_version, | |
ace51c4d EVH |
300 | "Q", |
301 | &(*wqids)[i]); | |
302 | if (errcode) | |
303 | break; | |
304 | } | |
305 | } | |
306 | ||
307 | if (errcode) { | |
308 | kfree(*wqids); | |
309 | *wqids = NULL; | |
310 | } | |
311 | } | |
312 | break; | |
f0853122 SK |
313 | case 'A': { |
314 | struct p9_stat_dotl *stbuf = | |
315 | va_arg(ap, struct p9_stat_dotl *); | |
316 | ||
317 | memset(stbuf, 0, sizeof(struct p9_stat_dotl)); | |
318 | errcode = | |
319 | p9pdu_readf(pdu, proto_version, | |
447c5094 | 320 | "qQdugqqqqqqqqqqqqqqq", |
f0853122 SK |
321 | &stbuf->st_result_mask, |
322 | &stbuf->qid, | |
323 | &stbuf->st_mode, | |
324 | &stbuf->st_uid, &stbuf->st_gid, | |
325 | &stbuf->st_nlink, | |
326 | &stbuf->st_rdev, &stbuf->st_size, | |
327 | &stbuf->st_blksize, &stbuf->st_blocks, | |
328 | &stbuf->st_atime_sec, | |
329 | &stbuf->st_atime_nsec, | |
330 | &stbuf->st_mtime_sec, | |
331 | &stbuf->st_mtime_nsec, | |
332 | &stbuf->st_ctime_sec, | |
333 | &stbuf->st_ctime_nsec, | |
334 | &stbuf->st_btime_sec, | |
335 | &stbuf->st_btime_nsec, | |
336 | &stbuf->st_gen, | |
337 | &stbuf->st_data_version); | |
338 | } | |
339 | break; | |
ace51c4d | 340 | case '?': |
c56e4acf SK |
341 | if ((proto_version != p9_proto_2000u) && |
342 | (proto_version != p9_proto_2000L)) | |
ace51c4d EVH |
343 | return 0; |
344 | break; | |
345 | default: | |
346 | BUG(); | |
347 | break; | |
348 | } | |
349 | ||
350 | if (errcode) | |
351 | break; | |
352 | } | |
353 | ||
354 | return errcode; | |
355 | } | |
356 | ||
357 | int | |
342fee1d SK |
358 | p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt, |
359 | va_list ap) | |
ace51c4d EVH |
360 | { |
361 | const char *ptr; | |
362 | int errcode = 0; | |
363 | ||
364 | for (ptr = fmt; *ptr; ptr++) { | |
365 | switch (*ptr) { | |
366 | case 'b':{ | |
367 | int8_t val = va_arg(ap, int); | |
368 | if (pdu_write(pdu, &val, sizeof(val))) | |
369 | errcode = -EFAULT; | |
370 | } | |
371 | break; | |
372 | case 'w':{ | |
beeebc92 | 373 | __le16 val = cpu_to_le16(va_arg(ap, int)); |
ace51c4d EVH |
374 | if (pdu_write(pdu, &val, sizeof(val))) |
375 | errcode = -EFAULT; | |
376 | } | |
377 | break; | |
378 | case 'd':{ | |
beeebc92 | 379 | __le32 val = cpu_to_le32(va_arg(ap, int32_t)); |
ace51c4d EVH |
380 | if (pdu_write(pdu, &val, sizeof(val))) |
381 | errcode = -EFAULT; | |
382 | } | |
383 | break; | |
384 | case 'q':{ | |
beeebc92 | 385 | __le64 val = cpu_to_le64(va_arg(ap, int64_t)); |
ace51c4d EVH |
386 | if (pdu_write(pdu, &val, sizeof(val))) |
387 | errcode = -EFAULT; | |
388 | } | |
389 | break; | |
390 | case 's':{ | |
e45c5405 | 391 | const char *sptr = va_arg(ap, const char *); |
219fd58b | 392 | uint16_t len = 0; |
e45c5405 | 393 | if (sptr) |
d31bb4f0 | 394 | len = min_t(size_t, strlen(sptr), |
219fd58b | 395 | USHRT_MAX); |
ace51c4d | 396 | |
342fee1d SK |
397 | errcode = p9pdu_writef(pdu, proto_version, |
398 | "w", len); | |
e45c5405 | 399 | if (!errcode && pdu_write(pdu, sptr, len)) |
ace51c4d EVH |
400 | errcode = -EFAULT; |
401 | } | |
402 | break; | |
97fc8b1e EB |
403 | case 'u': { |
404 | kuid_t uid = va_arg(ap, kuid_t); | |
405 | __le32 val = cpu_to_le32( | |
406 | from_kuid(&init_user_ns, uid)); | |
407 | if (pdu_write(pdu, &val, sizeof(val))) | |
408 | errcode = -EFAULT; | |
409 | } break; | |
410 | case 'g': { | |
411 | kgid_t gid = va_arg(ap, kgid_t); | |
412 | __le32 val = cpu_to_le32( | |
413 | from_kgid(&init_user_ns, gid)); | |
414 | if (pdu_write(pdu, &val, sizeof(val))) | |
415 | errcode = -EFAULT; | |
416 | } break; | |
ace51c4d EVH |
417 | case 'Q':{ |
418 | const struct p9_qid *qid = | |
419 | va_arg(ap, const struct p9_qid *); | |
420 | errcode = | |
342fee1d | 421 | p9pdu_writef(pdu, proto_version, "bdq", |
ace51c4d EVH |
422 | qid->type, qid->version, |
423 | qid->path); | |
424 | } break; | |
425 | case 'S':{ | |
426 | const struct p9_wstat *stbuf = | |
427 | va_arg(ap, const struct p9_wstat *); | |
428 | errcode = | |
342fee1d | 429 | p9pdu_writef(pdu, proto_version, |
447c5094 | 430 | "wwdQdddqssss?sugu", |
ace51c4d | 431 | stbuf->size, stbuf->type, |
51a87c55 | 432 | stbuf->dev, &stbuf->qid, |
ace51c4d EVH |
433 | stbuf->mode, stbuf->atime, |
434 | stbuf->mtime, stbuf->length, | |
435 | stbuf->name, stbuf->uid, | |
436 | stbuf->gid, stbuf->muid, | |
437 | stbuf->extension, stbuf->n_uid, | |
438 | stbuf->n_gid, stbuf->n_muid); | |
439 | } break; | |
440 | case 'D':{ | |
219fd58b | 441 | uint32_t count = va_arg(ap, uint32_t); |
ace51c4d EVH |
442 | const void *data = va_arg(ap, const void *); |
443 | ||
342fee1d SK |
444 | errcode = p9pdu_writef(pdu, proto_version, "d", |
445 | count); | |
ace51c4d EVH |
446 | if (!errcode && pdu_write(pdu, data, count)) |
447 | errcode = -EFAULT; | |
448 | } | |
449 | break; | |
51a87c55 EVH |
450 | case 'U':{ |
451 | int32_t count = va_arg(ap, int32_t); | |
452 | const char __user *udata = | |
e45c5405 | 453 | va_arg(ap, const void __user *); |
342fee1d SK |
454 | errcode = p9pdu_writef(pdu, proto_version, "d", |
455 | count); | |
51a87c55 EVH |
456 | if (!errcode && pdu_write_u(pdu, udata, count)) |
457 | errcode = -EFAULT; | |
458 | } | |
459 | break; | |
ace51c4d | 460 | case 'T':{ |
b76225e2 | 461 | uint16_t nwname = va_arg(ap, int); |
ace51c4d EVH |
462 | const char **wnames = va_arg(ap, const char **); |
463 | ||
342fee1d SK |
464 | errcode = p9pdu_writef(pdu, proto_version, "w", |
465 | nwname); | |
ace51c4d EVH |
466 | if (!errcode) { |
467 | int i; | |
468 | ||
469 | for (i = 0; i < nwname; i++) { | |
470 | errcode = | |
342fee1d SK |
471 | p9pdu_writef(pdu, |
472 | proto_version, | |
ace51c4d EVH |
473 | "s", |
474 | wnames[i]); | |
475 | if (errcode) | |
476 | break; | |
477 | } | |
478 | } | |
479 | } | |
480 | break; | |
481 | case 'R':{ | |
482 | int16_t nwqid = va_arg(ap, int); | |
483 | struct p9_qid *wqids = | |
484 | va_arg(ap, struct p9_qid *); | |
485 | ||
342fee1d SK |
486 | errcode = p9pdu_writef(pdu, proto_version, "w", |
487 | nwqid); | |
ace51c4d EVH |
488 | if (!errcode) { |
489 | int i; | |
490 | ||
491 | for (i = 0; i < nwqid; i++) { | |
492 | errcode = | |
342fee1d SK |
493 | p9pdu_writef(pdu, |
494 | proto_version, | |
ace51c4d EVH |
495 | "Q", |
496 | &wqids[i]); | |
497 | if (errcode) | |
498 | break; | |
499 | } | |
500 | } | |
501 | } | |
502 | break; | |
87d7845a SK |
503 | case 'I':{ |
504 | struct p9_iattr_dotl *p9attr = va_arg(ap, | |
505 | struct p9_iattr_dotl *); | |
506 | ||
507 | errcode = p9pdu_writef(pdu, proto_version, | |
447c5094 | 508 | "ddugqqqqq", |
87d7845a SK |
509 | p9attr->valid, |
510 | p9attr->mode, | |
511 | p9attr->uid, | |
512 | p9attr->gid, | |
513 | p9attr->size, | |
514 | p9attr->atime_sec, | |
515 | p9attr->atime_nsec, | |
516 | p9attr->mtime_sec, | |
517 | p9attr->mtime_nsec); | |
518 | } | |
519 | break; | |
ace51c4d | 520 | case '?': |
c56e4acf SK |
521 | if ((proto_version != p9_proto_2000u) && |
522 | (proto_version != p9_proto_2000L)) | |
ace51c4d EVH |
523 | return 0; |
524 | break; | |
525 | default: | |
526 | BUG(); | |
527 | break; | |
528 | } | |
529 | ||
530 | if (errcode) | |
531 | break; | |
532 | } | |
533 | ||
534 | return errcode; | |
535 | } | |
536 | ||
342fee1d | 537 | int p9pdu_readf(struct p9_fcall *pdu, int proto_version, const char *fmt, ...) |
ace51c4d EVH |
538 | { |
539 | va_list ap; | |
540 | int ret; | |
541 | ||
542 | va_start(ap, fmt); | |
342fee1d | 543 | ret = p9pdu_vreadf(pdu, proto_version, fmt, ap); |
ace51c4d EVH |
544 | va_end(ap); |
545 | ||
546 | return ret; | |
547 | } | |
548 | ||
549 | static int | |
342fee1d | 550 | p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...) |
ace51c4d EVH |
551 | { |
552 | va_list ap; | |
553 | int ret; | |
554 | ||
555 | va_start(ap, fmt); | |
342fee1d | 556 | ret = p9pdu_vwritef(pdu, proto_version, fmt, ap); |
ace51c4d EVH |
557 | va_end(ap); |
558 | ||
559 | return ret; | |
560 | } | |
51a87c55 | 561 | |
348b5901 | 562 | int p9stat_read(struct p9_client *clnt, char *buf, int len, struct p9_wstat *st) |
02da398b EVH |
563 | { |
564 | struct p9_fcall fake_pdu; | |
e7f4b8f1 | 565 | int ret; |
02da398b EVH |
566 | |
567 | fake_pdu.size = len; | |
568 | fake_pdu.capacity = len; | |
569 | fake_pdu.sdata = buf; | |
570 | fake_pdu.offset = 0; | |
571 | ||
348b5901 | 572 | ret = p9pdu_readf(&fake_pdu, clnt->proto_version, "S", st); |
e7f4b8f1 | 573 | if (ret) { |
5d385153 | 574 | p9_debug(P9_DEBUG_9P, "<<< p9stat_read failed: %d\n", ret); |
348b5901 | 575 | trace_9p_protocol_dump(clnt, &fake_pdu); |
e7f4b8f1 EVH |
576 | } |
577 | ||
578 | return ret; | |
02da398b EVH |
579 | } |
580 | EXPORT_SYMBOL(p9stat_read); | |
581 | ||
51a87c55 EVH |
582 | int p9pdu_prepare(struct p9_fcall *pdu, int16_t tag, int8_t type) |
583 | { | |
9bb6c10a | 584 | pdu->id = type; |
51a87c55 EVH |
585 | return p9pdu_writef(pdu, 0, "dbw", 0, type, tag); |
586 | } | |
587 | ||
348b5901 | 588 | int p9pdu_finalize(struct p9_client *clnt, struct p9_fcall *pdu) |
51a87c55 EVH |
589 | { |
590 | int size = pdu->size; | |
591 | int err; | |
592 | ||
593 | pdu->size = 0; | |
594 | err = p9pdu_writef(pdu, 0, "d", size); | |
595 | pdu->size = size; | |
596 | ||
348b5901 | 597 | trace_9p_protocol_dump(clnt, pdu); |
5d385153 JP |
598 | p9_debug(P9_DEBUG_9P, ">>> size=%d type: %d tag: %d\n", |
599 | pdu->size, pdu->id, pdu->tag); | |
e7f4b8f1 | 600 | |
51a87c55 EVH |
601 | return err; |
602 | } | |
603 | ||
604 | void p9pdu_reset(struct p9_fcall *pdu) | |
605 | { | |
606 | pdu->offset = 0; | |
607 | pdu->size = 0; | |
608 | } | |
7751bdb3 | 609 | |
348b5901 AK |
610 | int p9dirent_read(struct p9_client *clnt, char *buf, int len, |
611 | struct p9_dirent *dirent) | |
7751bdb3 SK |
612 | { |
613 | struct p9_fcall fake_pdu; | |
614 | int ret; | |
615 | char *nameptr; | |
616 | ||
617 | fake_pdu.size = len; | |
618 | fake_pdu.capacity = len; | |
619 | fake_pdu.sdata = buf; | |
620 | fake_pdu.offset = 0; | |
621 | ||
348b5901 AK |
622 | ret = p9pdu_readf(&fake_pdu, clnt->proto_version, "Qqbs", &dirent->qid, |
623 | &dirent->d_off, &dirent->d_type, &nameptr); | |
7751bdb3 | 624 | if (ret) { |
5d385153 | 625 | p9_debug(P9_DEBUG_9P, "<<< p9dirent_read failed: %d\n", ret); |
348b5901 | 626 | trace_9p_protocol_dump(clnt, &fake_pdu); |
7751bdb3 SK |
627 | goto out; |
628 | } | |
629 | ||
630 | strcpy(dirent->d_name, nameptr); | |
1b0bcbcf | 631 | kfree(nameptr); |
7751bdb3 SK |
632 | |
633 | out: | |
634 | return fake_pdu.offset; | |
635 | } | |
636 | EXPORT_SYMBOL(p9dirent_read); |