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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> | |
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> |
4f3b35c1 | 36 | #include <linux/uio.h> |
ace51c4d EVH |
37 | #include <net/9p/9p.h> |
38 | #include <net/9p/client.h> | |
39 | #include "protocol.h" | |
40 | ||
348b5901 AK |
41 | #include <trace/events/9p.h> |
42 | ||
ace51c4d | 43 | static int |
342fee1d | 44 | p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...); |
ace51c4d EVH |
45 | |
46 | void p9stat_free(struct p9_wstat *stbuf) | |
47 | { | |
48 | kfree(stbuf->name); | |
eec253a2 | 49 | stbuf->name = NULL; |
ace51c4d | 50 | kfree(stbuf->uid); |
eec253a2 | 51 | stbuf->uid = NULL; |
ace51c4d | 52 | kfree(stbuf->gid); |
eec253a2 | 53 | stbuf->gid = NULL; |
ace51c4d | 54 | kfree(stbuf->muid); |
eec253a2 | 55 | stbuf->muid = NULL; |
ace51c4d | 56 | kfree(stbuf->extension); |
eec253a2 | 57 | stbuf->extension = NULL; |
ace51c4d EVH |
58 | } |
59 | EXPORT_SYMBOL(p9stat_free); | |
60 | ||
abfa034e | 61 | size_t pdu_read(struct p9_fcall *pdu, void *data, size_t size) |
ace51c4d | 62 | { |
01b0c5cf | 63 | size_t len = min(pdu->size - pdu->offset, size); |
ace51c4d EVH |
64 | memcpy(data, &pdu->sdata[pdu->offset], len); |
65 | pdu->offset += len; | |
66 | return size - len; | |
67 | } | |
68 | ||
69 | static size_t pdu_write(struct p9_fcall *pdu, const void *data, size_t size) | |
70 | { | |
01b0c5cf | 71 | size_t len = min(pdu->capacity - pdu->size, size); |
ace51c4d EVH |
72 | memcpy(&pdu->sdata[pdu->size], data, len); |
73 | pdu->size += len; | |
74 | return size - len; | |
75 | } | |
76 | ||
51a87c55 | 77 | static size_t |
4f3b35c1 | 78 | pdu_write_u(struct p9_fcall *pdu, struct iov_iter *from, size_t size) |
51a87c55 | 79 | { |
01b0c5cf | 80 | size_t len = min(pdu->capacity - pdu->size, size); |
4f3b35c1 | 81 | struct iov_iter i = *from; |
1c512a7c | 82 | if (!copy_from_iter_full(&pdu->sdata[pdu->size], len, &i)) |
7b3bb3fe | 83 | len = 0; |
51a87c55 EVH |
84 | |
85 | pdu->size += len; | |
86 | return size - len; | |
87 | } | |
88 | ||
ace51c4d EVH |
89 | /* |
90 | b - int8_t | |
91 | w - int16_t | |
92 | d - int32_t | |
93 | q - int64_t | |
94 | s - string | |
97fc8b1e EB |
95 | u - numeric uid |
96 | g - numeric gid | |
ace51c4d EVH |
97 | S - stat |
98 | Q - qid | |
99 | D - data blob (int32_t size followed by void *, results are not freed) | |
100 | T - array of strings (int16_t count, followed by strings) | |
101 | R - array of qids (int16_t count, followed by qids) | |
f0853122 | 102 | A - stat for 9p2000.L (p9_stat_dotl) |
ace51c4d EVH |
103 | ? - if optional = 1, continue parsing |
104 | */ | |
105 | ||
106 | static int | |
342fee1d SK |
107 | p9pdu_vreadf(struct p9_fcall *pdu, int proto_version, const char *fmt, |
108 | va_list ap) | |
ace51c4d EVH |
109 | { |
110 | const char *ptr; | |
111 | int errcode = 0; | |
112 | ||
113 | for (ptr = fmt; *ptr; ptr++) { | |
114 | switch (*ptr) { | |
115 | case 'b':{ | |
116 | int8_t *val = va_arg(ap, int8_t *); | |
117 | if (pdu_read(pdu, val, sizeof(*val))) { | |
118 | errcode = -EFAULT; | |
119 | break; | |
120 | } | |
121 | } | |
122 | break; | |
123 | case 'w':{ | |
124 | int16_t *val = va_arg(ap, int16_t *); | |
beeebc92 EVH |
125 | __le16 le_val; |
126 | if (pdu_read(pdu, &le_val, sizeof(le_val))) { | |
ace51c4d EVH |
127 | errcode = -EFAULT; |
128 | break; | |
129 | } | |
beeebc92 | 130 | *val = le16_to_cpu(le_val); |
ace51c4d EVH |
131 | } |
132 | break; | |
133 | case 'd':{ | |
134 | int32_t *val = va_arg(ap, int32_t *); | |
beeebc92 EVH |
135 | __le32 le_val; |
136 | if (pdu_read(pdu, &le_val, sizeof(le_val))) { | |
ace51c4d EVH |
137 | errcode = -EFAULT; |
138 | break; | |
139 | } | |
beeebc92 | 140 | *val = le32_to_cpu(le_val); |
ace51c4d EVH |
141 | } |
142 | break; | |
143 | case 'q':{ | |
144 | int64_t *val = va_arg(ap, int64_t *); | |
beeebc92 EVH |
145 | __le64 le_val; |
146 | if (pdu_read(pdu, &le_val, sizeof(le_val))) { | |
ace51c4d EVH |
147 | errcode = -EFAULT; |
148 | break; | |
149 | } | |
beeebc92 | 150 | *val = le64_to_cpu(le_val); |
ace51c4d EVH |
151 | } |
152 | break; | |
153 | case 's':{ | |
e45c5405 | 154 | char **sptr = va_arg(ap, char **); |
219fd58b | 155 | uint16_t len; |
ace51c4d | 156 | |
342fee1d SK |
157 | errcode = p9pdu_readf(pdu, proto_version, |
158 | "w", &len); | |
ace51c4d EVH |
159 | if (errcode) |
160 | break; | |
161 | ||
eeff66ef | 162 | *sptr = kmalloc(len + 1, GFP_NOFS); |
e45c5405 | 163 | if (*sptr == NULL) { |
ace51c4d EVH |
164 | errcode = -EFAULT; |
165 | break; | |
166 | } | |
219fd58b | 167 | if (pdu_read(pdu, *sptr, len)) { |
ace51c4d | 168 | errcode = -EFAULT; |
e45c5405 EVH |
169 | kfree(*sptr); |
170 | *sptr = NULL; | |
ace51c4d | 171 | } else |
219fd58b | 172 | (*sptr)[len] = 0; |
ace51c4d EVH |
173 | } |
174 | break; | |
97fc8b1e EB |
175 | case 'u': { |
176 | kuid_t *uid = va_arg(ap, kuid_t *); | |
177 | __le32 le_val; | |
178 | if (pdu_read(pdu, &le_val, sizeof(le_val))) { | |
179 | errcode = -EFAULT; | |
180 | break; | |
181 | } | |
182 | *uid = make_kuid(&init_user_ns, | |
183 | le32_to_cpu(le_val)); | |
184 | } break; | |
185 | case 'g': { | |
186 | kgid_t *gid = va_arg(ap, kgid_t *); | |
187 | __le32 le_val; | |
188 | if (pdu_read(pdu, &le_val, sizeof(le_val))) { | |
189 | errcode = -EFAULT; | |
190 | break; | |
191 | } | |
192 | *gid = make_kgid(&init_user_ns, | |
193 | le32_to_cpu(le_val)); | |
194 | } break; | |
ace51c4d EVH |
195 | case 'Q':{ |
196 | struct p9_qid *qid = | |
197 | va_arg(ap, struct p9_qid *); | |
198 | ||
342fee1d | 199 | errcode = p9pdu_readf(pdu, proto_version, "bdq", |
ace51c4d EVH |
200 | &qid->type, &qid->version, |
201 | &qid->path); | |
202 | } | |
203 | break; | |
204 | case 'S':{ | |
205 | struct p9_wstat *stbuf = | |
206 | va_arg(ap, struct p9_wstat *); | |
207 | ||
f0a0ac2e | 208 | memset(stbuf, 0, sizeof(struct p9_wstat)); |
447c5094 EB |
209 | stbuf->n_uid = stbuf->n_muid = INVALID_UID; |
210 | stbuf->n_gid = INVALID_GID; | |
211 | ||
ace51c4d | 212 | errcode = |
342fee1d | 213 | p9pdu_readf(pdu, proto_version, |
447c5094 | 214 | "wwdQdddqssss?sugu", |
ace51c4d EVH |
215 | &stbuf->size, &stbuf->type, |
216 | &stbuf->dev, &stbuf->qid, | |
217 | &stbuf->mode, &stbuf->atime, | |
218 | &stbuf->mtime, &stbuf->length, | |
219 | &stbuf->name, &stbuf->uid, | |
220 | &stbuf->gid, &stbuf->muid, | |
221 | &stbuf->extension, | |
222 | &stbuf->n_uid, &stbuf->n_gid, | |
223 | &stbuf->n_muid); | |
224 | if (errcode) | |
225 | p9stat_free(stbuf); | |
226 | } | |
227 | break; | |
228 | case 'D':{ | |
219fd58b | 229 | uint32_t *count = va_arg(ap, uint32_t *); |
ace51c4d EVH |
230 | void **data = va_arg(ap, void **); |
231 | ||
232 | errcode = | |
342fee1d | 233 | p9pdu_readf(pdu, proto_version, "d", count); |
ace51c4d EVH |
234 | if (!errcode) { |
235 | *count = | |
219fd58b | 236 | min_t(uint32_t, *count, |
01b0c5cf | 237 | pdu->size - pdu->offset); |
ace51c4d EVH |
238 | *data = &pdu->sdata[pdu->offset]; |
239 | } | |
240 | } | |
241 | break; | |
242 | case 'T':{ | |
b76225e2 | 243 | uint16_t *nwname = va_arg(ap, uint16_t *); |
ace51c4d EVH |
244 | char ***wnames = va_arg(ap, char ***); |
245 | ||
342fee1d SK |
246 | errcode = p9pdu_readf(pdu, proto_version, |
247 | "w", nwname); | |
ace51c4d EVH |
248 | if (!errcode) { |
249 | *wnames = | |
250 | kmalloc(sizeof(char *) * *nwname, | |
eeff66ef | 251 | GFP_NOFS); |
ace51c4d EVH |
252 | if (!*wnames) |
253 | errcode = -ENOMEM; | |
254 | } | |
255 | ||
256 | if (!errcode) { | |
257 | int i; | |
258 | ||
259 | for (i = 0; i < *nwname; i++) { | |
260 | errcode = | |
342fee1d SK |
261 | p9pdu_readf(pdu, |
262 | proto_version, | |
ace51c4d EVH |
263 | "s", |
264 | &(*wnames)[i]); | |
265 | if (errcode) | |
266 | break; | |
267 | } | |
268 | } | |
269 | ||
270 | if (errcode) { | |
271 | if (*wnames) { | |
272 | int i; | |
273 | ||
274 | for (i = 0; i < *nwname; i++) | |
275 | kfree((*wnames)[i]); | |
276 | } | |
277 | kfree(*wnames); | |
278 | *wnames = NULL; | |
279 | } | |
280 | } | |
281 | break; | |
282 | case 'R':{ | |
6250a8ba | 283 | uint16_t *nwqid = va_arg(ap, uint16_t *); |
ace51c4d EVH |
284 | struct p9_qid **wqids = |
285 | va_arg(ap, struct p9_qid **); | |
286 | ||
287 | *wqids = NULL; | |
288 | ||
289 | errcode = | |
342fee1d | 290 | p9pdu_readf(pdu, proto_version, "w", nwqid); |
ace51c4d EVH |
291 | if (!errcode) { |
292 | *wqids = | |
293 | kmalloc(*nwqid * | |
294 | sizeof(struct p9_qid), | |
eeff66ef | 295 | GFP_NOFS); |
ace51c4d EVH |
296 | if (*wqids == NULL) |
297 | errcode = -ENOMEM; | |
298 | } | |
299 | ||
300 | if (!errcode) { | |
301 | int i; | |
302 | ||
303 | for (i = 0; i < *nwqid; i++) { | |
304 | errcode = | |
342fee1d SK |
305 | p9pdu_readf(pdu, |
306 | proto_version, | |
ace51c4d EVH |
307 | "Q", |
308 | &(*wqids)[i]); | |
309 | if (errcode) | |
310 | break; | |
311 | } | |
312 | } | |
313 | ||
314 | if (errcode) { | |
315 | kfree(*wqids); | |
316 | *wqids = NULL; | |
317 | } | |
318 | } | |
319 | break; | |
f0853122 SK |
320 | case 'A': { |
321 | struct p9_stat_dotl *stbuf = | |
322 | va_arg(ap, struct p9_stat_dotl *); | |
323 | ||
324 | memset(stbuf, 0, sizeof(struct p9_stat_dotl)); | |
325 | errcode = | |
326 | p9pdu_readf(pdu, proto_version, | |
447c5094 | 327 | "qQdugqqqqqqqqqqqqqqq", |
f0853122 SK |
328 | &stbuf->st_result_mask, |
329 | &stbuf->qid, | |
330 | &stbuf->st_mode, | |
331 | &stbuf->st_uid, &stbuf->st_gid, | |
332 | &stbuf->st_nlink, | |
333 | &stbuf->st_rdev, &stbuf->st_size, | |
334 | &stbuf->st_blksize, &stbuf->st_blocks, | |
335 | &stbuf->st_atime_sec, | |
336 | &stbuf->st_atime_nsec, | |
337 | &stbuf->st_mtime_sec, | |
338 | &stbuf->st_mtime_nsec, | |
339 | &stbuf->st_ctime_sec, | |
340 | &stbuf->st_ctime_nsec, | |
341 | &stbuf->st_btime_sec, | |
342 | &stbuf->st_btime_nsec, | |
343 | &stbuf->st_gen, | |
344 | &stbuf->st_data_version); | |
345 | } | |
346 | break; | |
ace51c4d | 347 | case '?': |
c56e4acf SK |
348 | if ((proto_version != p9_proto_2000u) && |
349 | (proto_version != p9_proto_2000L)) | |
ace51c4d EVH |
350 | return 0; |
351 | break; | |
352 | default: | |
353 | BUG(); | |
354 | break; | |
355 | } | |
356 | ||
357 | if (errcode) | |
358 | break; | |
359 | } | |
360 | ||
361 | return errcode; | |
362 | } | |
363 | ||
364 | int | |
342fee1d SK |
365 | p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt, |
366 | va_list ap) | |
ace51c4d EVH |
367 | { |
368 | const char *ptr; | |
369 | int errcode = 0; | |
370 | ||
371 | for (ptr = fmt; *ptr; ptr++) { | |
372 | switch (*ptr) { | |
373 | case 'b':{ | |
374 | int8_t val = va_arg(ap, int); | |
375 | if (pdu_write(pdu, &val, sizeof(val))) | |
376 | errcode = -EFAULT; | |
377 | } | |
378 | break; | |
379 | case 'w':{ | |
beeebc92 | 380 | __le16 val = cpu_to_le16(va_arg(ap, int)); |
ace51c4d EVH |
381 | if (pdu_write(pdu, &val, sizeof(val))) |
382 | errcode = -EFAULT; | |
383 | } | |
384 | break; | |
385 | case 'd':{ | |
beeebc92 | 386 | __le32 val = cpu_to_le32(va_arg(ap, int32_t)); |
ace51c4d EVH |
387 | if (pdu_write(pdu, &val, sizeof(val))) |
388 | errcode = -EFAULT; | |
389 | } | |
390 | break; | |
391 | case 'q':{ | |
beeebc92 | 392 | __le64 val = cpu_to_le64(va_arg(ap, int64_t)); |
ace51c4d EVH |
393 | if (pdu_write(pdu, &val, sizeof(val))) |
394 | errcode = -EFAULT; | |
395 | } | |
396 | break; | |
397 | case 's':{ | |
e45c5405 | 398 | const char *sptr = va_arg(ap, const char *); |
219fd58b | 399 | uint16_t len = 0; |
e45c5405 | 400 | if (sptr) |
d31bb4f0 | 401 | len = min_t(size_t, strlen(sptr), |
219fd58b | 402 | USHRT_MAX); |
ace51c4d | 403 | |
342fee1d SK |
404 | errcode = p9pdu_writef(pdu, proto_version, |
405 | "w", len); | |
e45c5405 | 406 | if (!errcode && pdu_write(pdu, sptr, len)) |
ace51c4d EVH |
407 | errcode = -EFAULT; |
408 | } | |
409 | break; | |
97fc8b1e EB |
410 | case 'u': { |
411 | kuid_t uid = va_arg(ap, kuid_t); | |
412 | __le32 val = cpu_to_le32( | |
413 | from_kuid(&init_user_ns, uid)); | |
414 | if (pdu_write(pdu, &val, sizeof(val))) | |
415 | errcode = -EFAULT; | |
416 | } break; | |
417 | case 'g': { | |
418 | kgid_t gid = va_arg(ap, kgid_t); | |
419 | __le32 val = cpu_to_le32( | |
420 | from_kgid(&init_user_ns, gid)); | |
421 | if (pdu_write(pdu, &val, sizeof(val))) | |
422 | errcode = -EFAULT; | |
423 | } break; | |
ace51c4d EVH |
424 | case 'Q':{ |
425 | const struct p9_qid *qid = | |
426 | va_arg(ap, const struct p9_qid *); | |
427 | errcode = | |
342fee1d | 428 | p9pdu_writef(pdu, proto_version, "bdq", |
ace51c4d EVH |
429 | qid->type, qid->version, |
430 | qid->path); | |
431 | } break; | |
432 | case 'S':{ | |
433 | const struct p9_wstat *stbuf = | |
434 | va_arg(ap, const struct p9_wstat *); | |
435 | errcode = | |
342fee1d | 436 | p9pdu_writef(pdu, proto_version, |
447c5094 | 437 | "wwdQdddqssss?sugu", |
ace51c4d | 438 | stbuf->size, stbuf->type, |
51a87c55 | 439 | stbuf->dev, &stbuf->qid, |
ace51c4d EVH |
440 | stbuf->mode, stbuf->atime, |
441 | stbuf->mtime, stbuf->length, | |
442 | stbuf->name, stbuf->uid, | |
443 | stbuf->gid, stbuf->muid, | |
444 | stbuf->extension, stbuf->n_uid, | |
445 | stbuf->n_gid, stbuf->n_muid); | |
446 | } break; | |
4f3b35c1 | 447 | case 'V':{ |
6250a8ba | 448 | uint32_t count = va_arg(ap, uint32_t); |
4f3b35c1 AV |
449 | struct iov_iter *from = |
450 | va_arg(ap, struct iov_iter *); | |
342fee1d SK |
451 | errcode = p9pdu_writef(pdu, proto_version, "d", |
452 | count); | |
4f3b35c1 | 453 | if (!errcode && pdu_write_u(pdu, from, count)) |
51a87c55 EVH |
454 | errcode = -EFAULT; |
455 | } | |
456 | break; | |
ace51c4d | 457 | case 'T':{ |
b76225e2 | 458 | uint16_t nwname = va_arg(ap, int); |
ace51c4d EVH |
459 | const char **wnames = va_arg(ap, const char **); |
460 | ||
342fee1d SK |
461 | errcode = p9pdu_writef(pdu, proto_version, "w", |
462 | nwname); | |
ace51c4d EVH |
463 | if (!errcode) { |
464 | int i; | |
465 | ||
466 | for (i = 0; i < nwname; i++) { | |
467 | errcode = | |
342fee1d SK |
468 | p9pdu_writef(pdu, |
469 | proto_version, | |
ace51c4d EVH |
470 | "s", |
471 | wnames[i]); | |
472 | if (errcode) | |
473 | break; | |
474 | } | |
475 | } | |
476 | } | |
477 | break; | |
478 | case 'R':{ | |
6250a8ba | 479 | uint16_t nwqid = va_arg(ap, int); |
ace51c4d EVH |
480 | struct p9_qid *wqids = |
481 | va_arg(ap, struct p9_qid *); | |
482 | ||
342fee1d SK |
483 | errcode = p9pdu_writef(pdu, proto_version, "w", |
484 | nwqid); | |
ace51c4d EVH |
485 | if (!errcode) { |
486 | int i; | |
487 | ||
488 | for (i = 0; i < nwqid; i++) { | |
489 | errcode = | |
342fee1d SK |
490 | p9pdu_writef(pdu, |
491 | proto_version, | |
ace51c4d EVH |
492 | "Q", |
493 | &wqids[i]); | |
494 | if (errcode) | |
495 | break; | |
496 | } | |
497 | } | |
498 | } | |
499 | break; | |
87d7845a SK |
500 | case 'I':{ |
501 | struct p9_iattr_dotl *p9attr = va_arg(ap, | |
502 | struct p9_iattr_dotl *); | |
503 | ||
504 | errcode = p9pdu_writef(pdu, proto_version, | |
447c5094 | 505 | "ddugqqqqq", |
87d7845a SK |
506 | p9attr->valid, |
507 | p9attr->mode, | |
508 | p9attr->uid, | |
509 | p9attr->gid, | |
510 | p9attr->size, | |
511 | p9attr->atime_sec, | |
512 | p9attr->atime_nsec, | |
513 | p9attr->mtime_sec, | |
514 | p9attr->mtime_nsec); | |
515 | } | |
516 | break; | |
ace51c4d | 517 | case '?': |
c56e4acf SK |
518 | if ((proto_version != p9_proto_2000u) && |
519 | (proto_version != p9_proto_2000L)) | |
ace51c4d EVH |
520 | return 0; |
521 | break; | |
522 | default: | |
523 | BUG(); | |
524 | break; | |
525 | } | |
526 | ||
527 | if (errcode) | |
528 | break; | |
529 | } | |
530 | ||
531 | return errcode; | |
532 | } | |
533 | ||
342fee1d | 534 | int p9pdu_readf(struct p9_fcall *pdu, int proto_version, const char *fmt, ...) |
ace51c4d EVH |
535 | { |
536 | va_list ap; | |
537 | int ret; | |
538 | ||
539 | va_start(ap, fmt); | |
342fee1d | 540 | ret = p9pdu_vreadf(pdu, proto_version, fmt, ap); |
ace51c4d EVH |
541 | va_end(ap); |
542 | ||
543 | return ret; | |
544 | } | |
545 | ||
546 | static int | |
342fee1d | 547 | p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...) |
ace51c4d EVH |
548 | { |
549 | va_list ap; | |
550 | int ret; | |
551 | ||
552 | va_start(ap, fmt); | |
342fee1d | 553 | ret = p9pdu_vwritef(pdu, proto_version, fmt, ap); |
ace51c4d EVH |
554 | va_end(ap); |
555 | ||
556 | return ret; | |
557 | } | |
51a87c55 | 558 | |
348b5901 | 559 | int p9stat_read(struct p9_client *clnt, char *buf, int len, struct p9_wstat *st) |
02da398b EVH |
560 | { |
561 | struct p9_fcall fake_pdu; | |
e7f4b8f1 | 562 | int ret; |
02da398b EVH |
563 | |
564 | fake_pdu.size = len; | |
565 | fake_pdu.capacity = len; | |
566 | fake_pdu.sdata = buf; | |
567 | fake_pdu.offset = 0; | |
568 | ||
348b5901 | 569 | ret = p9pdu_readf(&fake_pdu, clnt->proto_version, "S", st); |
e7f4b8f1 | 570 | if (ret) { |
5d385153 | 571 | p9_debug(P9_DEBUG_9P, "<<< p9stat_read failed: %d\n", ret); |
348b5901 | 572 | trace_9p_protocol_dump(clnt, &fake_pdu); |
c9a58199 | 573 | return ret; |
e7f4b8f1 EVH |
574 | } |
575 | ||
c9a58199 | 576 | return fake_pdu.offset; |
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 | { | |
9bb6c10a | 582 | pdu->id = type; |
51a87c55 EVH |
583 | return p9pdu_writef(pdu, 0, "dbw", 0, type, tag); |
584 | } | |
585 | ||
348b5901 | 586 | int p9pdu_finalize(struct p9_client *clnt, struct p9_fcall *pdu) |
51a87c55 EVH |
587 | { |
588 | int size = pdu->size; | |
589 | int err; | |
590 | ||
591 | pdu->size = 0; | |
592 | err = p9pdu_writef(pdu, 0, "d", size); | |
593 | pdu->size = size; | |
594 | ||
348b5901 | 595 | trace_9p_protocol_dump(clnt, pdu); |
5d385153 JP |
596 | p9_debug(P9_DEBUG_9P, ">>> size=%d type: %d tag: %d\n", |
597 | pdu->size, pdu->id, pdu->tag); | |
e7f4b8f1 | 598 | |
51a87c55 EVH |
599 | return err; |
600 | } | |
601 | ||
602 | void p9pdu_reset(struct p9_fcall *pdu) | |
603 | { | |
604 | pdu->offset = 0; | |
605 | pdu->size = 0; | |
606 | } | |
7751bdb3 | 607 | |
348b5901 AK |
608 | int p9dirent_read(struct p9_client *clnt, char *buf, int len, |
609 | struct p9_dirent *dirent) | |
7751bdb3 SK |
610 | { |
611 | struct p9_fcall fake_pdu; | |
612 | int ret; | |
613 | char *nameptr; | |
614 | ||
615 | fake_pdu.size = len; | |
616 | fake_pdu.capacity = len; | |
617 | fake_pdu.sdata = buf; | |
618 | fake_pdu.offset = 0; | |
619 | ||
348b5901 AK |
620 | ret = p9pdu_readf(&fake_pdu, clnt->proto_version, "Qqbs", &dirent->qid, |
621 | &dirent->d_off, &dirent->d_type, &nameptr); | |
7751bdb3 | 622 | if (ret) { |
5d385153 | 623 | p9_debug(P9_DEBUG_9P, "<<< p9dirent_read failed: %d\n", ret); |
348b5901 | 624 | trace_9p_protocol_dump(clnt, &fake_pdu); |
c4b7dec1 | 625 | return ret; |
7751bdb3 SK |
626 | } |
627 | ||
c4b7dec1 DM |
628 | ret = strscpy(dirent->d_name, nameptr, sizeof(dirent->d_name)); |
629 | if (ret < 0) { | |
630 | p9_debug(P9_DEBUG_ERROR, | |
631 | "On the wire dirent name too long: %s\n", | |
632 | nameptr); | |
633 | kfree(nameptr); | |
634 | return ret; | |
635 | } | |
1b0bcbcf | 636 | kfree(nameptr); |
7751bdb3 | 637 | |
7751bdb3 SK |
638 | return fake_pdu.offset; |
639 | } | |
640 | EXPORT_SYMBOL(p9dirent_read); |