1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * 9P Protocol Support Code |
4 | * |
5 | * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com> |
6 | * |
7 | * Base on code from Anthony Liguori <aliguori@us.ibm.com> |
8 | * Copyright (C) 2008 by IBM, Corp. |
9 | */ |
10 | |
11 | #include <linux/module.h> |
12 | #include <linux/errno.h> |
13 | #include <linux/kernel.h> |
14 | #include <linux/uaccess.h> |
15 | #include <linux/slab.h> |
16 | #include <linux/sched.h> |
17 | #include <linux/stddef.h> |
18 | #include <linux/types.h> |
19 | #include <linux/uio.h> |
20 | #include <net/9p/9p.h> |
21 | #include <net/9p/client.h> |
22 | #include "protocol.h" |
23 | |
24 | #include <trace/events/9p.h> |
25 | |
26 | /* len[2] text[len] */ |
27 | #define P9_STRLEN(s) \ |
28 | (2 + min_t(size_t, s ? strlen(s) : 0, USHRT_MAX)) |
29 | |
30 | /** |
31 | * p9_msg_buf_size - Returns a buffer size sufficiently large to hold the |
32 | * intended 9p message. |
33 | * @c: client |
34 | * @type: message type |
35 | * @fmt: format template for assembling request message |
36 | * (see p9pdu_vwritef) |
37 | * @ap: variable arguments to be fed to passed format template |
38 | * (see p9pdu_vwritef) |
39 | * |
40 | * Note: Even for response types (P9_R*) the format template and variable |
41 | * arguments must always be for the originating request type (P9_T*). |
42 | */ |
43 | size_t p9_msg_buf_size(struct p9_client *c, enum p9_msg_t type, |
44 | const char *fmt, va_list ap) |
45 | { |
46 | /* size[4] type[1] tag[2] */ |
47 | const int hdr = 4 + 1 + 2; |
48 | /* ename[s] errno[4] */ |
49 | const int rerror_size = hdr + P9_ERRMAX + 4; |
50 | /* ecode[4] */ |
51 | const int rlerror_size = hdr + 4; |
52 | const int err_size = |
53 | c->proto_version == p9_proto_2000L ? rlerror_size : rerror_size; |
54 | |
55 | static_assert(NAME_MAX <= 4*1024, "p9_msg_buf_size() currently assumes " |
56 | "a max. allowed directory entry name length of 4k" ); |
57 | |
58 | switch (type) { |
59 | |
60 | /* message types not used at all */ |
61 | case P9_TERROR: |
62 | case P9_TLERROR: |
63 | case P9_TAUTH: |
64 | case P9_RAUTH: |
65 | BUG(); |
66 | |
67 | /* variable length & potentially large message types */ |
68 | case P9_TATTACH: |
69 | BUG_ON(strcmp("ddss?u" , fmt)); |
70 | va_arg(ap, int32_t); |
71 | va_arg(ap, int32_t); |
72 | { |
73 | const char *uname = va_arg(ap, const char *); |
74 | const char *aname = va_arg(ap, const char *); |
75 | /* fid[4] afid[4] uname[s] aname[s] n_uname[4] */ |
76 | return hdr + 4 + 4 + P9_STRLEN(uname) + P9_STRLEN(aname) + 4; |
77 | } |
78 | case P9_TWALK: |
79 | BUG_ON(strcmp("ddT" , fmt)); |
80 | va_arg(ap, int32_t); |
81 | va_arg(ap, int32_t); |
82 | { |
83 | uint i, nwname = va_arg(ap, int); |
84 | size_t wname_all; |
85 | const char **wnames = va_arg(ap, const char **); |
86 | for (i = 0, wname_all = 0; i < nwname; ++i) { |
87 | wname_all += P9_STRLEN(wnames[i]); |
88 | } |
89 | /* fid[4] newfid[4] nwname[2] nwname*(wname[s]) */ |
90 | return hdr + 4 + 4 + 2 + wname_all; |
91 | } |
92 | case P9_RWALK: |
93 | BUG_ON(strcmp("ddT" , fmt)); |
94 | va_arg(ap, int32_t); |
95 | va_arg(ap, int32_t); |
96 | { |
97 | uint nwname = va_arg(ap, int); |
98 | /* nwqid[2] nwqid*(wqid[13]) */ |
99 | return max_t(size_t, hdr + 2 + nwname * 13, err_size); |
100 | } |
101 | case P9_TCREATE: |
102 | BUG_ON(strcmp("dsdb?s" , fmt)); |
103 | va_arg(ap, int32_t); |
104 | { |
105 | const char *name = va_arg(ap, const char *); |
106 | if (c->proto_version == p9_proto_legacy) { |
107 | /* fid[4] name[s] perm[4] mode[1] */ |
108 | return hdr + 4 + P9_STRLEN(name) + 4 + 1; |
109 | } else { |
110 | va_arg(ap, int32_t); |
111 | va_arg(ap, int); |
112 | { |
113 | const char *ext = va_arg(ap, const char *); |
114 | /* fid[4] name[s] perm[4] mode[1] extension[s] */ |
115 | return hdr + 4 + P9_STRLEN(name) + 4 + 1 + P9_STRLEN(ext); |
116 | } |
117 | } |
118 | } |
119 | case P9_TLCREATE: |
120 | BUG_ON(strcmp("dsddg" , fmt)); |
121 | va_arg(ap, int32_t); |
122 | { |
123 | const char *name = va_arg(ap, const char *); |
124 | /* fid[4] name[s] flags[4] mode[4] gid[4] */ |
125 | return hdr + 4 + P9_STRLEN(name) + 4 + 4 + 4; |
126 | } |
127 | case P9_RREAD: |
128 | case P9_RREADDIR: |
129 | BUG_ON(strcmp("dqd" , fmt)); |
130 | va_arg(ap, int32_t); |
131 | va_arg(ap, int64_t); |
132 | { |
133 | const int32_t count = va_arg(ap, int32_t); |
134 | /* count[4] data[count] */ |
135 | return max_t(size_t, hdr + 4 + count, err_size); |
136 | } |
137 | case P9_TWRITE: |
138 | BUG_ON(strcmp("dqV" , fmt)); |
139 | va_arg(ap, int32_t); |
140 | va_arg(ap, int64_t); |
141 | { |
142 | const int32_t count = va_arg(ap, int32_t); |
143 | /* fid[4] offset[8] count[4] data[count] */ |
144 | return hdr + 4 + 8 + 4 + count; |
145 | } |
146 | case P9_TRENAMEAT: |
147 | BUG_ON(strcmp("dsds" , fmt)); |
148 | va_arg(ap, int32_t); |
149 | { |
150 | const char *oldname, *newname; |
151 | oldname = va_arg(ap, const char *); |
152 | va_arg(ap, int32_t); |
153 | newname = va_arg(ap, const char *); |
154 | /* olddirfid[4] oldname[s] newdirfid[4] newname[s] */ |
155 | return hdr + 4 + P9_STRLEN(oldname) + 4 + P9_STRLEN(newname); |
156 | } |
157 | case P9_TSYMLINK: |
158 | BUG_ON(strcmp("dssg" , fmt)); |
159 | va_arg(ap, int32_t); |
160 | { |
161 | const char *name = va_arg(ap, const char *); |
162 | const char *symtgt = va_arg(ap, const char *); |
163 | /* fid[4] name[s] symtgt[s] gid[4] */ |
164 | return hdr + 4 + P9_STRLEN(name) + P9_STRLEN(symtgt) + 4; |
165 | } |
166 | |
167 | case P9_RERROR: |
168 | return rerror_size; |
169 | case P9_RLERROR: |
170 | return rlerror_size; |
171 | |
172 | /* small message types */ |
173 | case P9_TWSTAT: |
174 | case P9_RSTAT: |
175 | case P9_RREADLINK: |
176 | case P9_TXATTRWALK: |
177 | case P9_TXATTRCREATE: |
178 | case P9_TLINK: |
179 | case P9_TMKDIR: |
180 | case P9_TMKNOD: |
181 | case P9_TRENAME: |
182 | case P9_TUNLINKAT: |
183 | case P9_TLOCK: |
184 | return 8 * 1024; |
185 | |
186 | /* tiny message types */ |
187 | default: |
188 | return 4 * 1024; |
189 | |
190 | } |
191 | } |
192 | |
193 | static int |
194 | p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...); |
195 | |
196 | void p9stat_free(struct p9_wstat *stbuf) |
197 | { |
198 | kfree(objp: stbuf->name); |
199 | stbuf->name = NULL; |
200 | kfree(objp: stbuf->uid); |
201 | stbuf->uid = NULL; |
202 | kfree(objp: stbuf->gid); |
203 | stbuf->gid = NULL; |
204 | kfree(objp: stbuf->muid); |
205 | stbuf->muid = NULL; |
206 | kfree(objp: stbuf->extension); |
207 | stbuf->extension = NULL; |
208 | } |
209 | EXPORT_SYMBOL(p9stat_free); |
210 | |
211 | size_t pdu_read(struct p9_fcall *pdu, void *data, size_t size) |
212 | { |
213 | size_t len = min(pdu->size - pdu->offset, size); |
214 | |
215 | memcpy(data, &pdu->sdata[pdu->offset], len); |
216 | pdu->offset += len; |
217 | return size - len; |
218 | } |
219 | |
220 | static size_t pdu_write(struct p9_fcall *pdu, const void *data, size_t size) |
221 | { |
222 | size_t len = min(pdu->capacity - pdu->size, size); |
223 | |
224 | memcpy(&pdu->sdata[pdu->size], data, len); |
225 | pdu->size += len; |
226 | return size - len; |
227 | } |
228 | |
229 | static size_t |
230 | pdu_write_u(struct p9_fcall *pdu, struct iov_iter *from, size_t size) |
231 | { |
232 | size_t len = min(pdu->capacity - pdu->size, size); |
233 | |
234 | if (!copy_from_iter_full(addr: &pdu->sdata[pdu->size], bytes: len, i: from)) |
235 | len = 0; |
236 | |
237 | pdu->size += len; |
238 | return size - len; |
239 | } |
240 | |
241 | /* b - int8_t |
242 | * w - int16_t |
243 | * d - int32_t |
244 | * q - int64_t |
245 | * s - string |
246 | * u - numeric uid |
247 | * g - numeric gid |
248 | * S - stat |
249 | * Q - qid |
250 | * D - data blob (int32_t size followed by void *, results are not freed) |
251 | * T - array of strings (int16_t count, followed by strings) |
252 | * R - array of qids (int16_t count, followed by qids) |
253 | * A - stat for 9p2000.L (p9_stat_dotl) |
254 | * ? - if optional = 1, continue parsing |
255 | */ |
256 | |
257 | static int |
258 | p9pdu_vreadf(struct p9_fcall *pdu, int proto_version, const char *fmt, |
259 | va_list ap) |
260 | { |
261 | const char *ptr; |
262 | int errcode = 0; |
263 | |
264 | for (ptr = fmt; *ptr; ptr++) { |
265 | switch (*ptr) { |
266 | case 'b':{ |
267 | int8_t *val = va_arg(ap, int8_t *); |
268 | if (pdu_read(pdu, data: val, size: sizeof(*val))) { |
269 | errcode = -EFAULT; |
270 | break; |
271 | } |
272 | } |
273 | break; |
274 | case 'w':{ |
275 | int16_t *val = va_arg(ap, int16_t *); |
276 | __le16 le_val; |
277 | if (pdu_read(pdu, data: &le_val, size: sizeof(le_val))) { |
278 | errcode = -EFAULT; |
279 | break; |
280 | } |
281 | *val = le16_to_cpu(le_val); |
282 | } |
283 | break; |
284 | case 'd':{ |
285 | int32_t *val = va_arg(ap, int32_t *); |
286 | __le32 le_val; |
287 | if (pdu_read(pdu, data: &le_val, size: sizeof(le_val))) { |
288 | errcode = -EFAULT; |
289 | break; |
290 | } |
291 | *val = le32_to_cpu(le_val); |
292 | } |
293 | break; |
294 | case 'q':{ |
295 | int64_t *val = va_arg(ap, int64_t *); |
296 | __le64 le_val; |
297 | if (pdu_read(pdu, data: &le_val, size: sizeof(le_val))) { |
298 | errcode = -EFAULT; |
299 | break; |
300 | } |
301 | *val = le64_to_cpu(le_val); |
302 | } |
303 | break; |
304 | case 's':{ |
305 | char **sptr = va_arg(ap, char **); |
306 | uint16_t len; |
307 | |
308 | errcode = p9pdu_readf(pdu, proto_version, |
309 | fmt: "w" , &len); |
310 | if (errcode) |
311 | break; |
312 | |
313 | *sptr = kmalloc(size: len + 1, GFP_NOFS); |
314 | if (*sptr == NULL) { |
315 | errcode = -ENOMEM; |
316 | break; |
317 | } |
318 | if (pdu_read(pdu, data: *sptr, size: len)) { |
319 | errcode = -EFAULT; |
320 | kfree(objp: *sptr); |
321 | *sptr = NULL; |
322 | } else |
323 | (*sptr)[len] = 0; |
324 | } |
325 | break; |
326 | case 'u': { |
327 | kuid_t *uid = va_arg(ap, kuid_t *); |
328 | __le32 le_val; |
329 | if (pdu_read(pdu, data: &le_val, size: sizeof(le_val))) { |
330 | errcode = -EFAULT; |
331 | break; |
332 | } |
333 | *uid = make_kuid(from: &init_user_ns, |
334 | le32_to_cpu(le_val)); |
335 | } break; |
336 | case 'g': { |
337 | kgid_t *gid = va_arg(ap, kgid_t *); |
338 | __le32 le_val; |
339 | if (pdu_read(pdu, data: &le_val, size: sizeof(le_val))) { |
340 | errcode = -EFAULT; |
341 | break; |
342 | } |
343 | *gid = make_kgid(from: &init_user_ns, |
344 | le32_to_cpu(le_val)); |
345 | } break; |
346 | case 'Q':{ |
347 | struct p9_qid *qid = |
348 | va_arg(ap, struct p9_qid *); |
349 | |
350 | errcode = p9pdu_readf(pdu, proto_version, fmt: "bdq" , |
351 | &qid->type, &qid->version, |
352 | &qid->path); |
353 | } |
354 | break; |
355 | case 'S':{ |
356 | struct p9_wstat *stbuf = |
357 | va_arg(ap, struct p9_wstat *); |
358 | |
359 | memset(stbuf, 0, sizeof(struct p9_wstat)); |
360 | stbuf->n_uid = stbuf->n_muid = INVALID_UID; |
361 | stbuf->n_gid = INVALID_GID; |
362 | |
363 | errcode = |
364 | p9pdu_readf(pdu, proto_version, |
365 | fmt: "wwdQdddqssss?sugu" , |
366 | &stbuf->size, &stbuf->type, |
367 | &stbuf->dev, &stbuf->qid, |
368 | &stbuf->mode, &stbuf->atime, |
369 | &stbuf->mtime, &stbuf->length, |
370 | &stbuf->name, &stbuf->uid, |
371 | &stbuf->gid, &stbuf->muid, |
372 | &stbuf->extension, |
373 | &stbuf->n_uid, &stbuf->n_gid, |
374 | &stbuf->n_muid); |
375 | if (errcode) |
376 | p9stat_free(stbuf); |
377 | } |
378 | break; |
379 | case 'D':{ |
380 | uint32_t *count = va_arg(ap, uint32_t *); |
381 | void **data = va_arg(ap, void **); |
382 | |
383 | errcode = |
384 | p9pdu_readf(pdu, proto_version, fmt: "d" , count); |
385 | if (!errcode) { |
386 | *count = |
387 | min_t(uint32_t, *count, |
388 | pdu->size - pdu->offset); |
389 | *data = &pdu->sdata[pdu->offset]; |
390 | } |
391 | } |
392 | break; |
393 | case 'T':{ |
394 | uint16_t *nwname = va_arg(ap, uint16_t *); |
395 | char ***wnames = va_arg(ap, char ***); |
396 | |
397 | errcode = p9pdu_readf(pdu, proto_version, |
398 | fmt: "w" , nwname); |
399 | if (!errcode) { |
400 | *wnames = |
401 | kmalloc_array(n: *nwname, |
402 | size: sizeof(char *), |
403 | GFP_NOFS); |
404 | if (!*wnames) |
405 | errcode = -ENOMEM; |
406 | } |
407 | |
408 | if (!errcode) { |
409 | int i; |
410 | |
411 | for (i = 0; i < *nwname; i++) { |
412 | errcode = |
413 | p9pdu_readf(pdu, |
414 | proto_version, |
415 | fmt: "s" , |
416 | &(*wnames)[i]); |
417 | if (errcode) |
418 | break; |
419 | } |
420 | } |
421 | |
422 | if (errcode) { |
423 | if (*wnames) { |
424 | int i; |
425 | |
426 | for (i = 0; i < *nwname; i++) |
427 | kfree(objp: (*wnames)[i]); |
428 | } |
429 | kfree(objp: *wnames); |
430 | *wnames = NULL; |
431 | } |
432 | } |
433 | break; |
434 | case 'R':{ |
435 | uint16_t *nwqid = va_arg(ap, uint16_t *); |
436 | struct p9_qid **wqids = |
437 | va_arg(ap, struct p9_qid **); |
438 | |
439 | *wqids = NULL; |
440 | |
441 | errcode = |
442 | p9pdu_readf(pdu, proto_version, fmt: "w" , nwqid); |
443 | if (!errcode) { |
444 | *wqids = |
445 | kmalloc_array(n: *nwqid, |
446 | size: sizeof(struct p9_qid), |
447 | GFP_NOFS); |
448 | if (*wqids == NULL) |
449 | errcode = -ENOMEM; |
450 | } |
451 | |
452 | if (!errcode) { |
453 | int i; |
454 | |
455 | for (i = 0; i < *nwqid; i++) { |
456 | errcode = |
457 | p9pdu_readf(pdu, |
458 | proto_version, |
459 | fmt: "Q" , |
460 | &(*wqids)[i]); |
461 | if (errcode) |
462 | break; |
463 | } |
464 | } |
465 | |
466 | if (errcode) { |
467 | kfree(objp: *wqids); |
468 | *wqids = NULL; |
469 | } |
470 | } |
471 | break; |
472 | case 'A': { |
473 | struct p9_stat_dotl *stbuf = |
474 | va_arg(ap, struct p9_stat_dotl *); |
475 | |
476 | memset(stbuf, 0, sizeof(struct p9_stat_dotl)); |
477 | errcode = |
478 | p9pdu_readf(pdu, proto_version, |
479 | fmt: "qQdugqqqqqqqqqqqqqqq" , |
480 | &stbuf->st_result_mask, |
481 | &stbuf->qid, |
482 | &stbuf->st_mode, |
483 | &stbuf->st_uid, &stbuf->st_gid, |
484 | &stbuf->st_nlink, |
485 | &stbuf->st_rdev, &stbuf->st_size, |
486 | &stbuf->st_blksize, &stbuf->st_blocks, |
487 | &stbuf->st_atime_sec, |
488 | &stbuf->st_atime_nsec, |
489 | &stbuf->st_mtime_sec, |
490 | &stbuf->st_mtime_nsec, |
491 | &stbuf->st_ctime_sec, |
492 | &stbuf->st_ctime_nsec, |
493 | &stbuf->st_btime_sec, |
494 | &stbuf->st_btime_nsec, |
495 | &stbuf->st_gen, |
496 | &stbuf->st_data_version); |
497 | } |
498 | break; |
499 | case '?': |
500 | if ((proto_version != p9_proto_2000u) && |
501 | (proto_version != p9_proto_2000L)) |
502 | return 0; |
503 | break; |
504 | default: |
505 | BUG(); |
506 | break; |
507 | } |
508 | |
509 | if (errcode) |
510 | break; |
511 | } |
512 | |
513 | return errcode; |
514 | } |
515 | |
516 | int |
517 | p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt, |
518 | va_list ap) |
519 | { |
520 | const char *ptr; |
521 | int errcode = 0; |
522 | |
523 | for (ptr = fmt; *ptr; ptr++) { |
524 | switch (*ptr) { |
525 | case 'b':{ |
526 | int8_t val = va_arg(ap, int); |
527 | if (pdu_write(pdu, data: &val, size: sizeof(val))) |
528 | errcode = -EFAULT; |
529 | } |
530 | break; |
531 | case 'w':{ |
532 | __le16 val = cpu_to_le16(va_arg(ap, int)); |
533 | if (pdu_write(pdu, data: &val, size: sizeof(val))) |
534 | errcode = -EFAULT; |
535 | } |
536 | break; |
537 | case 'd':{ |
538 | __le32 val = cpu_to_le32(va_arg(ap, int32_t)); |
539 | if (pdu_write(pdu, data: &val, size: sizeof(val))) |
540 | errcode = -EFAULT; |
541 | } |
542 | break; |
543 | case 'q':{ |
544 | __le64 val = cpu_to_le64(va_arg(ap, int64_t)); |
545 | if (pdu_write(pdu, data: &val, size: sizeof(val))) |
546 | errcode = -EFAULT; |
547 | } |
548 | break; |
549 | case 's':{ |
550 | const char *sptr = va_arg(ap, const char *); |
551 | uint16_t len = 0; |
552 | if (sptr) |
553 | len = min_t(size_t, strlen(sptr), |
554 | USHRT_MAX); |
555 | |
556 | errcode = p9pdu_writef(pdu, proto_version, |
557 | fmt: "w" , len); |
558 | if (!errcode && pdu_write(pdu, data: sptr, size: len)) |
559 | errcode = -EFAULT; |
560 | } |
561 | break; |
562 | case 'u': { |
563 | kuid_t uid = va_arg(ap, kuid_t); |
564 | __le32 val = cpu_to_le32( |
565 | from_kuid(&init_user_ns, uid)); |
566 | if (pdu_write(pdu, data: &val, size: sizeof(val))) |
567 | errcode = -EFAULT; |
568 | } break; |
569 | case 'g': { |
570 | kgid_t gid = va_arg(ap, kgid_t); |
571 | __le32 val = cpu_to_le32( |
572 | from_kgid(&init_user_ns, gid)); |
573 | if (pdu_write(pdu, data: &val, size: sizeof(val))) |
574 | errcode = -EFAULT; |
575 | } break; |
576 | case 'Q':{ |
577 | const struct p9_qid *qid = |
578 | va_arg(ap, const struct p9_qid *); |
579 | errcode = |
580 | p9pdu_writef(pdu, proto_version, fmt: "bdq" , |
581 | qid->type, qid->version, |
582 | qid->path); |
583 | } break; |
584 | case 'S':{ |
585 | const struct p9_wstat *stbuf = |
586 | va_arg(ap, const struct p9_wstat *); |
587 | errcode = |
588 | p9pdu_writef(pdu, proto_version, |
589 | fmt: "wwdQdddqssss?sugu" , |
590 | stbuf->size, stbuf->type, |
591 | stbuf->dev, &stbuf->qid, |
592 | stbuf->mode, stbuf->atime, |
593 | stbuf->mtime, stbuf->length, |
594 | stbuf->name, stbuf->uid, |
595 | stbuf->gid, stbuf->muid, |
596 | stbuf->extension, stbuf->n_uid, |
597 | stbuf->n_gid, stbuf->n_muid); |
598 | } break; |
599 | case 'V':{ |
600 | uint32_t count = va_arg(ap, uint32_t); |
601 | struct iov_iter *from = |
602 | va_arg(ap, struct iov_iter *); |
603 | errcode = p9pdu_writef(pdu, proto_version, fmt: "d" , |
604 | count); |
605 | if (!errcode && pdu_write_u(pdu, from, size: count)) |
606 | errcode = -EFAULT; |
607 | } |
608 | break; |
609 | case 'T':{ |
610 | uint16_t nwname = va_arg(ap, int); |
611 | const char **wnames = va_arg(ap, const char **); |
612 | |
613 | errcode = p9pdu_writef(pdu, proto_version, fmt: "w" , |
614 | nwname); |
615 | if (!errcode) { |
616 | int i; |
617 | |
618 | for (i = 0; i < nwname; i++) { |
619 | errcode = |
620 | p9pdu_writef(pdu, |
621 | proto_version, |
622 | fmt: "s" , |
623 | wnames[i]); |
624 | if (errcode) |
625 | break; |
626 | } |
627 | } |
628 | } |
629 | break; |
630 | case 'R':{ |
631 | uint16_t nwqid = va_arg(ap, int); |
632 | struct p9_qid *wqids = |
633 | va_arg(ap, struct p9_qid *); |
634 | |
635 | errcode = p9pdu_writef(pdu, proto_version, fmt: "w" , |
636 | nwqid); |
637 | if (!errcode) { |
638 | int i; |
639 | |
640 | for (i = 0; i < nwqid; i++) { |
641 | errcode = |
642 | p9pdu_writef(pdu, |
643 | proto_version, |
644 | fmt: "Q" , |
645 | &wqids[i]); |
646 | if (errcode) |
647 | break; |
648 | } |
649 | } |
650 | } |
651 | break; |
652 | case 'I':{ |
653 | struct p9_iattr_dotl *p9attr = va_arg(ap, |
654 | struct p9_iattr_dotl *); |
655 | |
656 | errcode = p9pdu_writef(pdu, proto_version, |
657 | fmt: "ddugqqqqq" , |
658 | p9attr->valid, |
659 | p9attr->mode, |
660 | p9attr->uid, |
661 | p9attr->gid, |
662 | p9attr->size, |
663 | p9attr->atime_sec, |
664 | p9attr->atime_nsec, |
665 | p9attr->mtime_sec, |
666 | p9attr->mtime_nsec); |
667 | } |
668 | break; |
669 | case '?': |
670 | if ((proto_version != p9_proto_2000u) && |
671 | (proto_version != p9_proto_2000L)) |
672 | return 0; |
673 | break; |
674 | default: |
675 | BUG(); |
676 | break; |
677 | } |
678 | |
679 | if (errcode) |
680 | break; |
681 | } |
682 | |
683 | return errcode; |
684 | } |
685 | |
686 | int p9pdu_readf(struct p9_fcall *pdu, int proto_version, const char *fmt, ...) |
687 | { |
688 | va_list ap; |
689 | int ret; |
690 | |
691 | va_start(ap, fmt); |
692 | ret = p9pdu_vreadf(pdu, proto_version, fmt, ap); |
693 | va_end(ap); |
694 | |
695 | return ret; |
696 | } |
697 | |
698 | static int |
699 | p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...) |
700 | { |
701 | va_list ap; |
702 | int ret; |
703 | |
704 | va_start(ap, fmt); |
705 | ret = p9pdu_vwritef(pdu, proto_version, fmt, ap); |
706 | va_end(ap); |
707 | |
708 | return ret; |
709 | } |
710 | |
711 | int p9stat_read(struct p9_client *clnt, char *buf, int len, struct p9_wstat *st) |
712 | { |
713 | struct p9_fcall fake_pdu; |
714 | int ret; |
715 | |
716 | fake_pdu.size = len; |
717 | fake_pdu.capacity = len; |
718 | fake_pdu.sdata = buf; |
719 | fake_pdu.offset = 0; |
720 | |
721 | ret = p9pdu_readf(pdu: &fake_pdu, proto_version: clnt->proto_version, fmt: "S" , st); |
722 | if (ret) { |
723 | p9_debug(P9_DEBUG_9P, "<<< p9stat_read failed: %d\n" , ret); |
724 | trace_9p_protocol_dump(clnt, pdu: &fake_pdu); |
725 | return ret; |
726 | } |
727 | |
728 | return fake_pdu.offset; |
729 | } |
730 | EXPORT_SYMBOL(p9stat_read); |
731 | |
732 | int p9pdu_prepare(struct p9_fcall *pdu, int16_t tag, int8_t type) |
733 | { |
734 | pdu->id = type; |
735 | return p9pdu_writef(pdu, proto_version: 0, fmt: "dbw" , 0, type, tag); |
736 | } |
737 | |
738 | int p9pdu_finalize(struct p9_client *clnt, struct p9_fcall *pdu) |
739 | { |
740 | int size = pdu->size; |
741 | int err; |
742 | |
743 | pdu->size = 0; |
744 | err = p9pdu_writef(pdu, proto_version: 0, fmt: "d" , size); |
745 | pdu->size = size; |
746 | |
747 | trace_9p_protocol_dump(clnt, pdu); |
748 | p9_debug(P9_DEBUG_9P, ">>> size=%d type: %d tag: %d\n" , |
749 | pdu->size, pdu->id, pdu->tag); |
750 | |
751 | return err; |
752 | } |
753 | |
754 | void p9pdu_reset(struct p9_fcall *pdu) |
755 | { |
756 | pdu->offset = 0; |
757 | pdu->size = 0; |
758 | } |
759 | |
760 | int p9dirent_read(struct p9_client *clnt, char *buf, int len, |
761 | struct p9_dirent *dirent) |
762 | { |
763 | struct p9_fcall fake_pdu; |
764 | int ret; |
765 | char *nameptr; |
766 | |
767 | fake_pdu.size = len; |
768 | fake_pdu.capacity = len; |
769 | fake_pdu.sdata = buf; |
770 | fake_pdu.offset = 0; |
771 | |
772 | ret = p9pdu_readf(pdu: &fake_pdu, proto_version: clnt->proto_version, fmt: "Qqbs" , &dirent->qid, |
773 | &dirent->d_off, &dirent->d_type, &nameptr); |
774 | if (ret) { |
775 | p9_debug(P9_DEBUG_9P, "<<< p9dirent_read failed: %d\n" , ret); |
776 | trace_9p_protocol_dump(clnt, pdu: &fake_pdu); |
777 | return ret; |
778 | } |
779 | |
780 | ret = strscpy(p: dirent->d_name, q: nameptr, size: sizeof(dirent->d_name)); |
781 | if (ret < 0) { |
782 | p9_debug(P9_DEBUG_ERROR, |
783 | "On the wire dirent name too long: %s\n" , |
784 | nameptr); |
785 | kfree(objp: nameptr); |
786 | return ret; |
787 | } |
788 | kfree(objp: nameptr); |
789 | |
790 | return fake_pdu.offset; |
791 | } |
792 | EXPORT_SYMBOL(p9dirent_read); |
793 | |