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 | ||
bb2f8a55 VJJ |
117 | static size_t |
118 | pdu_write_urw(struct p9_fcall *pdu, const char *kdata, const char __user *udata, | |
119 | size_t size) | |
120 | { | |
121 | BUG_ON(pdu->size > P9_IOHDRSZ); | |
122 | pdu->pubuf = (char __user *)udata; | |
123 | pdu->pkbuf = (char *)kdata; | |
124 | pdu->pbuf_size = size; | |
125 | return 0; | |
126 | } | |
127 | ||
2c66523f VJJ |
128 | static size_t |
129 | pdu_write_readdir(struct p9_fcall *pdu, const char *kdata, size_t size) | |
130 | { | |
131 | BUG_ON(pdu->size > P9_READDIRHDRSZ); | |
132 | pdu->pkbuf = (char *)kdata; | |
133 | pdu->pbuf_size = size; | |
134 | return 0; | |
135 | } | |
136 | ||
ace51c4d EVH |
137 | /* |
138 | b - int8_t | |
139 | w - int16_t | |
140 | d - int32_t | |
141 | q - int64_t | |
142 | s - string | |
143 | S - stat | |
144 | Q - qid | |
145 | D - data blob (int32_t size followed by void *, results are not freed) | |
146 | T - array of strings (int16_t count, followed by strings) | |
147 | R - array of qids (int16_t count, followed by qids) | |
f0853122 | 148 | A - stat for 9p2000.L (p9_stat_dotl) |
ace51c4d EVH |
149 | ? - if optional = 1, continue parsing |
150 | */ | |
151 | ||
152 | static int | |
342fee1d SK |
153 | p9pdu_vreadf(struct p9_fcall *pdu, int proto_version, const char *fmt, |
154 | va_list ap) | |
ace51c4d EVH |
155 | { |
156 | const char *ptr; | |
157 | int errcode = 0; | |
158 | ||
159 | for (ptr = fmt; *ptr; ptr++) { | |
160 | switch (*ptr) { | |
161 | case 'b':{ | |
162 | int8_t *val = va_arg(ap, int8_t *); | |
163 | if (pdu_read(pdu, val, sizeof(*val))) { | |
164 | errcode = -EFAULT; | |
165 | break; | |
166 | } | |
167 | } | |
168 | break; | |
169 | case 'w':{ | |
170 | int16_t *val = va_arg(ap, int16_t *); | |
beeebc92 EVH |
171 | __le16 le_val; |
172 | if (pdu_read(pdu, &le_val, sizeof(le_val))) { | |
ace51c4d EVH |
173 | errcode = -EFAULT; |
174 | break; | |
175 | } | |
beeebc92 | 176 | *val = le16_to_cpu(le_val); |
ace51c4d EVH |
177 | } |
178 | break; | |
179 | case 'd':{ | |
180 | int32_t *val = va_arg(ap, int32_t *); | |
beeebc92 EVH |
181 | __le32 le_val; |
182 | if (pdu_read(pdu, &le_val, sizeof(le_val))) { | |
ace51c4d EVH |
183 | errcode = -EFAULT; |
184 | break; | |
185 | } | |
beeebc92 | 186 | *val = le32_to_cpu(le_val); |
ace51c4d EVH |
187 | } |
188 | break; | |
189 | case 'q':{ | |
190 | int64_t *val = va_arg(ap, int64_t *); | |
beeebc92 EVH |
191 | __le64 le_val; |
192 | if (pdu_read(pdu, &le_val, sizeof(le_val))) { | |
ace51c4d EVH |
193 | errcode = -EFAULT; |
194 | break; | |
195 | } | |
beeebc92 | 196 | *val = le64_to_cpu(le_val); |
ace51c4d EVH |
197 | } |
198 | break; | |
199 | case 's':{ | |
e45c5405 | 200 | char **sptr = va_arg(ap, char **); |
219fd58b | 201 | uint16_t len; |
ace51c4d | 202 | |
342fee1d SK |
203 | errcode = p9pdu_readf(pdu, proto_version, |
204 | "w", &len); | |
ace51c4d EVH |
205 | if (errcode) |
206 | break; | |
207 | ||
eeff66ef | 208 | *sptr = kmalloc(len + 1, GFP_NOFS); |
e45c5405 | 209 | if (*sptr == NULL) { |
ace51c4d EVH |
210 | errcode = -EFAULT; |
211 | break; | |
212 | } | |
219fd58b | 213 | if (pdu_read(pdu, *sptr, len)) { |
ace51c4d | 214 | errcode = -EFAULT; |
e45c5405 EVH |
215 | kfree(*sptr); |
216 | *sptr = NULL; | |
ace51c4d | 217 | } else |
219fd58b | 218 | (*sptr)[len] = 0; |
ace51c4d EVH |
219 | } |
220 | break; | |
221 | case 'Q':{ | |
222 | struct p9_qid *qid = | |
223 | va_arg(ap, struct p9_qid *); | |
224 | ||
342fee1d | 225 | errcode = p9pdu_readf(pdu, proto_version, "bdq", |
ace51c4d EVH |
226 | &qid->type, &qid->version, |
227 | &qid->path); | |
228 | } | |
229 | break; | |
230 | case 'S':{ | |
231 | struct p9_wstat *stbuf = | |
232 | va_arg(ap, struct p9_wstat *); | |
233 | ||
f0a0ac2e | 234 | memset(stbuf, 0, sizeof(struct p9_wstat)); |
ace51c4d | 235 | stbuf->n_uid = stbuf->n_gid = stbuf->n_muid = |
f0a0ac2e | 236 | -1; |
ace51c4d | 237 | errcode = |
342fee1d | 238 | p9pdu_readf(pdu, proto_version, |
ace51c4d EVH |
239 | "wwdQdddqssss?sddd", |
240 | &stbuf->size, &stbuf->type, | |
241 | &stbuf->dev, &stbuf->qid, | |
242 | &stbuf->mode, &stbuf->atime, | |
243 | &stbuf->mtime, &stbuf->length, | |
244 | &stbuf->name, &stbuf->uid, | |
245 | &stbuf->gid, &stbuf->muid, | |
246 | &stbuf->extension, | |
247 | &stbuf->n_uid, &stbuf->n_gid, | |
248 | &stbuf->n_muid); | |
249 | if (errcode) | |
250 | p9stat_free(stbuf); | |
251 | } | |
252 | break; | |
253 | case 'D':{ | |
219fd58b | 254 | uint32_t *count = va_arg(ap, uint32_t *); |
ace51c4d EVH |
255 | void **data = va_arg(ap, void **); |
256 | ||
257 | errcode = | |
342fee1d | 258 | p9pdu_readf(pdu, proto_version, "d", count); |
ace51c4d EVH |
259 | if (!errcode) { |
260 | *count = | |
219fd58b | 261 | min_t(uint32_t, *count, |
01b0c5cf | 262 | pdu->size - pdu->offset); |
ace51c4d EVH |
263 | *data = &pdu->sdata[pdu->offset]; |
264 | } | |
265 | } | |
266 | break; | |
267 | case 'T':{ | |
b76225e2 | 268 | uint16_t *nwname = va_arg(ap, uint16_t *); |
ace51c4d EVH |
269 | char ***wnames = va_arg(ap, char ***); |
270 | ||
342fee1d SK |
271 | errcode = p9pdu_readf(pdu, proto_version, |
272 | "w", nwname); | |
ace51c4d EVH |
273 | if (!errcode) { |
274 | *wnames = | |
275 | kmalloc(sizeof(char *) * *nwname, | |
eeff66ef | 276 | GFP_NOFS); |
ace51c4d EVH |
277 | if (!*wnames) |
278 | errcode = -ENOMEM; | |
279 | } | |
280 | ||
281 | if (!errcode) { | |
282 | int i; | |
283 | ||
284 | for (i = 0; i < *nwname; i++) { | |
285 | errcode = | |
342fee1d SK |
286 | p9pdu_readf(pdu, |
287 | proto_version, | |
ace51c4d EVH |
288 | "s", |
289 | &(*wnames)[i]); | |
290 | if (errcode) | |
291 | break; | |
292 | } | |
293 | } | |
294 | ||
295 | if (errcode) { | |
296 | if (*wnames) { | |
297 | int i; | |
298 | ||
299 | for (i = 0; i < *nwname; i++) | |
300 | kfree((*wnames)[i]); | |
301 | } | |
302 | kfree(*wnames); | |
303 | *wnames = NULL; | |
304 | } | |
305 | } | |
306 | break; | |
307 | case 'R':{ | |
308 | int16_t *nwqid = va_arg(ap, int16_t *); | |
309 | struct p9_qid **wqids = | |
310 | va_arg(ap, struct p9_qid **); | |
311 | ||
312 | *wqids = NULL; | |
313 | ||
314 | errcode = | |
342fee1d | 315 | p9pdu_readf(pdu, proto_version, "w", nwqid); |
ace51c4d EVH |
316 | if (!errcode) { |
317 | *wqids = | |
318 | kmalloc(*nwqid * | |
319 | sizeof(struct p9_qid), | |
eeff66ef | 320 | GFP_NOFS); |
ace51c4d EVH |
321 | if (*wqids == NULL) |
322 | errcode = -ENOMEM; | |
323 | } | |
324 | ||
325 | if (!errcode) { | |
326 | int i; | |
327 | ||
328 | for (i = 0; i < *nwqid; i++) { | |
329 | errcode = | |
342fee1d SK |
330 | p9pdu_readf(pdu, |
331 | proto_version, | |
ace51c4d EVH |
332 | "Q", |
333 | &(*wqids)[i]); | |
334 | if (errcode) | |
335 | break; | |
336 | } | |
337 | } | |
338 | ||
339 | if (errcode) { | |
340 | kfree(*wqids); | |
341 | *wqids = NULL; | |
342 | } | |
343 | } | |
344 | break; | |
f0853122 SK |
345 | case 'A': { |
346 | struct p9_stat_dotl *stbuf = | |
347 | va_arg(ap, struct p9_stat_dotl *); | |
348 | ||
349 | memset(stbuf, 0, sizeof(struct p9_stat_dotl)); | |
350 | errcode = | |
351 | p9pdu_readf(pdu, proto_version, | |
352 | "qQdddqqqqqqqqqqqqqqq", | |
353 | &stbuf->st_result_mask, | |
354 | &stbuf->qid, | |
355 | &stbuf->st_mode, | |
356 | &stbuf->st_uid, &stbuf->st_gid, | |
357 | &stbuf->st_nlink, | |
358 | &stbuf->st_rdev, &stbuf->st_size, | |
359 | &stbuf->st_blksize, &stbuf->st_blocks, | |
360 | &stbuf->st_atime_sec, | |
361 | &stbuf->st_atime_nsec, | |
362 | &stbuf->st_mtime_sec, | |
363 | &stbuf->st_mtime_nsec, | |
364 | &stbuf->st_ctime_sec, | |
365 | &stbuf->st_ctime_nsec, | |
366 | &stbuf->st_btime_sec, | |
367 | &stbuf->st_btime_nsec, | |
368 | &stbuf->st_gen, | |
369 | &stbuf->st_data_version); | |
370 | } | |
371 | break; | |
ace51c4d | 372 | case '?': |
c56e4acf SK |
373 | if ((proto_version != p9_proto_2000u) && |
374 | (proto_version != p9_proto_2000L)) | |
ace51c4d EVH |
375 | return 0; |
376 | break; | |
377 | default: | |
378 | BUG(); | |
379 | break; | |
380 | } | |
381 | ||
382 | if (errcode) | |
383 | break; | |
384 | } | |
385 | ||
386 | return errcode; | |
387 | } | |
388 | ||
389 | int | |
342fee1d SK |
390 | p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt, |
391 | va_list ap) | |
ace51c4d EVH |
392 | { |
393 | const char *ptr; | |
394 | int errcode = 0; | |
395 | ||
396 | for (ptr = fmt; *ptr; ptr++) { | |
397 | switch (*ptr) { | |
398 | case 'b':{ | |
399 | int8_t val = va_arg(ap, int); | |
400 | if (pdu_write(pdu, &val, sizeof(val))) | |
401 | errcode = -EFAULT; | |
402 | } | |
403 | break; | |
404 | case 'w':{ | |
beeebc92 | 405 | __le16 val = cpu_to_le16(va_arg(ap, int)); |
ace51c4d EVH |
406 | if (pdu_write(pdu, &val, sizeof(val))) |
407 | errcode = -EFAULT; | |
408 | } | |
409 | break; | |
410 | case 'd':{ | |
beeebc92 | 411 | __le32 val = cpu_to_le32(va_arg(ap, int32_t)); |
ace51c4d EVH |
412 | if (pdu_write(pdu, &val, sizeof(val))) |
413 | errcode = -EFAULT; | |
414 | } | |
415 | break; | |
416 | case 'q':{ | |
beeebc92 | 417 | __le64 val = cpu_to_le64(va_arg(ap, int64_t)); |
ace51c4d EVH |
418 | if (pdu_write(pdu, &val, sizeof(val))) |
419 | errcode = -EFAULT; | |
420 | } | |
421 | break; | |
422 | case 's':{ | |
e45c5405 | 423 | const char *sptr = va_arg(ap, const char *); |
219fd58b | 424 | uint16_t len = 0; |
e45c5405 | 425 | if (sptr) |
219fd58b MK |
426 | len = min_t(uint16_t, strlen(sptr), |
427 | USHRT_MAX); | |
ace51c4d | 428 | |
342fee1d SK |
429 | errcode = p9pdu_writef(pdu, proto_version, |
430 | "w", len); | |
e45c5405 | 431 | if (!errcode && pdu_write(pdu, sptr, len)) |
ace51c4d EVH |
432 | errcode = -EFAULT; |
433 | } | |
434 | break; | |
435 | case 'Q':{ | |
436 | const struct p9_qid *qid = | |
437 | va_arg(ap, const struct p9_qid *); | |
438 | errcode = | |
342fee1d | 439 | p9pdu_writef(pdu, proto_version, "bdq", |
ace51c4d EVH |
440 | qid->type, qid->version, |
441 | qid->path); | |
442 | } break; | |
443 | case 'S':{ | |
444 | const struct p9_wstat *stbuf = | |
445 | va_arg(ap, const struct p9_wstat *); | |
446 | errcode = | |
342fee1d | 447 | p9pdu_writef(pdu, proto_version, |
ace51c4d EVH |
448 | "wwdQdddqssss?sddd", |
449 | stbuf->size, stbuf->type, | |
51a87c55 | 450 | stbuf->dev, &stbuf->qid, |
ace51c4d EVH |
451 | stbuf->mode, stbuf->atime, |
452 | stbuf->mtime, stbuf->length, | |
453 | stbuf->name, stbuf->uid, | |
454 | stbuf->gid, stbuf->muid, | |
455 | stbuf->extension, stbuf->n_uid, | |
456 | stbuf->n_gid, stbuf->n_muid); | |
457 | } break; | |
458 | case 'D':{ | |
219fd58b | 459 | uint32_t count = va_arg(ap, uint32_t); |
ace51c4d EVH |
460 | const void *data = va_arg(ap, const void *); |
461 | ||
342fee1d SK |
462 | errcode = p9pdu_writef(pdu, proto_version, "d", |
463 | count); | |
ace51c4d EVH |
464 | if (!errcode && pdu_write(pdu, data, count)) |
465 | errcode = -EFAULT; | |
466 | } | |
467 | break; | |
bb2f8a55 VJJ |
468 | case 'E':{ |
469 | int32_t cnt = va_arg(ap, int32_t); | |
470 | const char *k = va_arg(ap, const void *); | |
bd8c8ade AK |
471 | const char __user *u = va_arg(ap, |
472 | const void __user *); | |
bb2f8a55 VJJ |
473 | errcode = p9pdu_writef(pdu, proto_version, "d", |
474 | cnt); | |
475 | if (!errcode && pdu_write_urw(pdu, k, u, cnt)) | |
476 | errcode = -EFAULT; | |
477 | } | |
478 | break; | |
2c66523f VJJ |
479 | case 'F':{ |
480 | int32_t cnt = va_arg(ap, int32_t); | |
481 | const char *k = va_arg(ap, const void *); | |
482 | errcode = p9pdu_writef(pdu, proto_version, "d", | |
483 | cnt); | |
484 | if (!errcode && pdu_write_readdir(pdu, k, cnt)) | |
485 | errcode = -EFAULT; | |
486 | } | |
487 | break; | |
51a87c55 EVH |
488 | case 'U':{ |
489 | int32_t count = va_arg(ap, int32_t); | |
490 | const char __user *udata = | |
e45c5405 | 491 | va_arg(ap, const void __user *); |
342fee1d SK |
492 | errcode = p9pdu_writef(pdu, proto_version, "d", |
493 | count); | |
51a87c55 EVH |
494 | if (!errcode && pdu_write_u(pdu, udata, count)) |
495 | errcode = -EFAULT; | |
496 | } | |
497 | break; | |
ace51c4d | 498 | case 'T':{ |
b76225e2 | 499 | uint16_t nwname = va_arg(ap, int); |
ace51c4d EVH |
500 | const char **wnames = va_arg(ap, const char **); |
501 | ||
342fee1d SK |
502 | errcode = p9pdu_writef(pdu, proto_version, "w", |
503 | nwname); | |
ace51c4d EVH |
504 | if (!errcode) { |
505 | int i; | |
506 | ||
507 | for (i = 0; i < nwname; i++) { | |
508 | errcode = | |
342fee1d SK |
509 | p9pdu_writef(pdu, |
510 | proto_version, | |
ace51c4d EVH |
511 | "s", |
512 | wnames[i]); | |
513 | if (errcode) | |
514 | break; | |
515 | } | |
516 | } | |
517 | } | |
518 | break; | |
519 | case 'R':{ | |
520 | int16_t nwqid = va_arg(ap, int); | |
521 | struct p9_qid *wqids = | |
522 | va_arg(ap, struct p9_qid *); | |
523 | ||
342fee1d SK |
524 | errcode = p9pdu_writef(pdu, proto_version, "w", |
525 | nwqid); | |
ace51c4d EVH |
526 | if (!errcode) { |
527 | int i; | |
528 | ||
529 | for (i = 0; i < nwqid; i++) { | |
530 | errcode = | |
342fee1d SK |
531 | p9pdu_writef(pdu, |
532 | proto_version, | |
ace51c4d EVH |
533 | "Q", |
534 | &wqids[i]); | |
535 | if (errcode) | |
536 | break; | |
537 | } | |
538 | } | |
539 | } | |
540 | break; | |
87d7845a SK |
541 | case 'I':{ |
542 | struct p9_iattr_dotl *p9attr = va_arg(ap, | |
543 | struct p9_iattr_dotl *); | |
544 | ||
545 | errcode = p9pdu_writef(pdu, proto_version, | |
546 | "ddddqqqqq", | |
547 | p9attr->valid, | |
548 | p9attr->mode, | |
549 | p9attr->uid, | |
550 | p9attr->gid, | |
551 | p9attr->size, | |
552 | p9attr->atime_sec, | |
553 | p9attr->atime_nsec, | |
554 | p9attr->mtime_sec, | |
555 | p9attr->mtime_nsec); | |
556 | } | |
557 | break; | |
ace51c4d | 558 | case '?': |
c56e4acf SK |
559 | if ((proto_version != p9_proto_2000u) && |
560 | (proto_version != p9_proto_2000L)) | |
ace51c4d EVH |
561 | return 0; |
562 | break; | |
563 | default: | |
564 | BUG(); | |
565 | break; | |
566 | } | |
567 | ||
568 | if (errcode) | |
569 | break; | |
570 | } | |
571 | ||
572 | return errcode; | |
573 | } | |
574 | ||
342fee1d | 575 | int p9pdu_readf(struct p9_fcall *pdu, int proto_version, const char *fmt, ...) |
ace51c4d EVH |
576 | { |
577 | va_list ap; | |
578 | int ret; | |
579 | ||
580 | va_start(ap, fmt); | |
342fee1d | 581 | ret = p9pdu_vreadf(pdu, proto_version, fmt, ap); |
ace51c4d EVH |
582 | va_end(ap); |
583 | ||
584 | return ret; | |
585 | } | |
586 | ||
587 | static int | |
342fee1d | 588 | p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...) |
ace51c4d EVH |
589 | { |
590 | va_list ap; | |
591 | int ret; | |
592 | ||
593 | va_start(ap, fmt); | |
342fee1d | 594 | ret = p9pdu_vwritef(pdu, proto_version, fmt, ap); |
ace51c4d EVH |
595 | va_end(ap); |
596 | ||
597 | return ret; | |
598 | } | |
51a87c55 | 599 | |
342fee1d | 600 | int p9stat_read(char *buf, int len, struct p9_wstat *st, int proto_version) |
02da398b EVH |
601 | { |
602 | struct p9_fcall fake_pdu; | |
e7f4b8f1 | 603 | int ret; |
02da398b EVH |
604 | |
605 | fake_pdu.size = len; | |
606 | fake_pdu.capacity = len; | |
607 | fake_pdu.sdata = buf; | |
608 | fake_pdu.offset = 0; | |
609 | ||
342fee1d | 610 | ret = p9pdu_readf(&fake_pdu, proto_version, "S", st); |
e7f4b8f1 EVH |
611 | if (ret) { |
612 | P9_DPRINTK(P9_DEBUG_9P, "<<< p9stat_read failed: %d\n", ret); | |
613 | p9pdu_dump(1, &fake_pdu); | |
614 | } | |
615 | ||
616 | return ret; | |
02da398b EVH |
617 | } |
618 | EXPORT_SYMBOL(p9stat_read); | |
619 | ||
51a87c55 EVH |
620 | int p9pdu_prepare(struct p9_fcall *pdu, int16_t tag, int8_t type) |
621 | { | |
9bb6c10a | 622 | pdu->id = type; |
51a87c55 EVH |
623 | return p9pdu_writef(pdu, 0, "dbw", 0, type, tag); |
624 | } | |
625 | ||
626 | int p9pdu_finalize(struct p9_fcall *pdu) | |
627 | { | |
628 | int size = pdu->size; | |
629 | int err; | |
630 | ||
631 | pdu->size = 0; | |
632 | err = p9pdu_writef(pdu, 0, "d", size); | |
633 | pdu->size = size; | |
634 | ||
0b15a3a5 | 635 | #ifdef CONFIG_NET_9P_DEBUG |
e7f4b8f1 | 636 | if ((p9_debug_level & P9_DEBUG_PKT) == P9_DEBUG_PKT) |
51a87c55 | 637 | p9pdu_dump(0, pdu); |
0b15a3a5 | 638 | #endif |
51a87c55 | 639 | |
e7f4b8f1 EVH |
640 | P9_DPRINTK(P9_DEBUG_9P, ">>> size=%d type: %d tag: %d\n", pdu->size, |
641 | pdu->id, pdu->tag); | |
642 | ||
51a87c55 EVH |
643 | return err; |
644 | } | |
645 | ||
646 | void p9pdu_reset(struct p9_fcall *pdu) | |
647 | { | |
648 | pdu->offset = 0; | |
649 | pdu->size = 0; | |
022cae36 VJJ |
650 | pdu->private = NULL; |
651 | pdu->pubuf = NULL; | |
652 | pdu->pkbuf = NULL; | |
653 | pdu->pbuf_size = 0; | |
51a87c55 | 654 | } |
7751bdb3 SK |
655 | |
656 | int p9dirent_read(char *buf, int len, struct p9_dirent *dirent, | |
657 | int proto_version) | |
658 | { | |
659 | struct p9_fcall fake_pdu; | |
660 | int ret; | |
661 | char *nameptr; | |
662 | ||
663 | fake_pdu.size = len; | |
664 | fake_pdu.capacity = len; | |
665 | fake_pdu.sdata = buf; | |
666 | fake_pdu.offset = 0; | |
667 | ||
668 | ret = p9pdu_readf(&fake_pdu, proto_version, "Qqbs", &dirent->qid, | |
669 | &dirent->d_off, &dirent->d_type, &nameptr); | |
670 | if (ret) { | |
671 | P9_DPRINTK(P9_DEBUG_9P, "<<< p9dirent_read failed: %d\n", ret); | |
672 | p9pdu_dump(1, &fake_pdu); | |
673 | goto out; | |
674 | } | |
675 | ||
676 | strcpy(dirent->d_name, nameptr); | |
1b0bcbcf | 677 | kfree(nameptr); |
7751bdb3 SK |
678 | |
679 | out: | |
680 | return fake_pdu.offset; | |
681 | } | |
682 | EXPORT_SYMBOL(p9dirent_read); |