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9f107513 AL |
1 | /* |
2 | * Virtio 9p backend | |
3 | * | |
4 | * Copyright IBM, Corp. 2010 | |
5 | * | |
6 | * Authors: | |
7 | * Anthony Liguori <aliguori@us.ibm.com> | |
8 | * | |
9 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
10 | * the COPYING file in the top-level directory. | |
11 | * | |
12 | */ | |
13 | ||
14 | #include "virtio.h" | |
15 | #include "pc.h" | |
16 | #include "qemu_socket.h" | |
17 | #include "virtio-9p.h" | |
18 | #include "fsdev/qemu-fsdev.h" | |
19 | #include "virtio-9p-debug.h" | |
20 | ||
21 | int dotu = 1; | |
22 | int debug_9p_pdu; | |
23 | ||
131dcb25 AL |
24 | static int v9fs_do_lstat(V9fsState *s, V9fsString *path, struct stat *stbuf) |
25 | { | |
26 | return s->ops->lstat(&s->ctx, path->data, stbuf); | |
27 | } | |
28 | ||
29 | static int v9fs_do_setuid(V9fsState *s, uid_t uid) | |
30 | { | |
31 | return s->ops->setuid(&s->ctx, uid); | |
32 | } | |
33 | ||
34 | static ssize_t v9fs_do_readlink(V9fsState *s, V9fsString *path, V9fsString *buf) | |
35 | { | |
36 | ssize_t len; | |
37 | ||
38 | buf->data = qemu_malloc(1024); | |
39 | ||
40 | len = s->ops->readlink(&s->ctx, path->data, buf->data, 1024 - 1); | |
41 | if (len > -1) { | |
42 | buf->size = len; | |
43 | buf->data[len] = 0; | |
44 | } | |
45 | ||
46 | return len; | |
47 | } | |
48 | ||
49 | static int v9fs_do_close(V9fsState *s, int fd) | |
50 | { | |
51 | return s->ops->close(&s->ctx, fd); | |
52 | } | |
53 | ||
54 | static int v9fs_do_closedir(V9fsState *s, DIR *dir) | |
55 | { | |
56 | return s->ops->closedir(&s->ctx, dir); | |
57 | } | |
58 | ||
a6568fe2 AL |
59 | static int v9fs_do_open(V9fsState *s, V9fsString *path, int flags) |
60 | { | |
61 | return s->ops->open(&s->ctx, path->data, flags); | |
62 | } | |
63 | ||
64 | static DIR *v9fs_do_opendir(V9fsState *s, V9fsString *path) | |
65 | { | |
66 | return s->ops->opendir(&s->ctx, path->data); | |
67 | } | |
68 | ||
a9231555 AL |
69 | static void v9fs_do_rewinddir(V9fsState *s, DIR *dir) |
70 | { | |
71 | return s->ops->rewinddir(&s->ctx, dir); | |
72 | } | |
73 | ||
74 | static off_t v9fs_do_telldir(V9fsState *s, DIR *dir) | |
75 | { | |
76 | return s->ops->telldir(&s->ctx, dir); | |
77 | } | |
78 | ||
79 | static struct dirent *v9fs_do_readdir(V9fsState *s, DIR *dir) | |
80 | { | |
81 | return s->ops->readdir(&s->ctx, dir); | |
82 | } | |
83 | ||
84 | static void v9fs_do_seekdir(V9fsState *s, DIR *dir, off_t off) | |
85 | { | |
86 | return s->ops->seekdir(&s->ctx, dir, off); | |
87 | } | |
88 | ||
89 | static int v9fs_do_readv(V9fsState *s, int fd, const struct iovec *iov, | |
90 | int iovcnt) | |
91 | { | |
92 | return s->ops->readv(&s->ctx, fd, iov, iovcnt); | |
93 | } | |
94 | ||
95 | static off_t v9fs_do_lseek(V9fsState *s, int fd, off_t offset, int whence) | |
96 | { | |
97 | return s->ops->lseek(&s->ctx, fd, offset, whence); | |
98 | } | |
99 | ||
a03f7874 AL |
100 | static void v9fs_string_init(V9fsString *str) |
101 | { | |
102 | str->data = NULL; | |
103 | str->size = 0; | |
104 | } | |
105 | ||
106 | static void v9fs_string_free(V9fsString *str) | |
107 | { | |
108 | qemu_free(str->data); | |
109 | str->data = NULL; | |
110 | str->size = 0; | |
111 | } | |
112 | ||
113 | static void v9fs_string_null(V9fsString *str) | |
114 | { | |
115 | v9fs_string_free(str); | |
116 | } | |
117 | ||
118 | static int number_to_string(void *arg, char type) | |
119 | { | |
120 | unsigned int ret = 0; | |
121 | ||
122 | switch (type) { | |
123 | case 'u': { | |
124 | unsigned int num = *(unsigned int *)arg; | |
125 | ||
126 | do { | |
127 | ret++; | |
128 | num = num/10; | |
129 | } while (num); | |
130 | break; | |
131 | } | |
132 | default: | |
133 | printf("Number_to_string: Unknown number format\n"); | |
134 | return -1; | |
135 | } | |
136 | ||
137 | return ret; | |
138 | } | |
139 | ||
140 | static int v9fs_string_alloc_printf(char **strp, const char *fmt, va_list ap) | |
141 | { | |
142 | va_list ap2; | |
143 | char *iter = (char *)fmt; | |
144 | int len = 0; | |
145 | int nr_args = 0; | |
146 | char *arg_char_ptr; | |
147 | unsigned int arg_uint; | |
148 | ||
149 | /* Find the number of %'s that denotes an argument */ | |
150 | for (iter = strstr(iter, "%"); iter; iter = strstr(iter, "%")) { | |
151 | nr_args++; | |
152 | iter++; | |
153 | } | |
154 | ||
155 | len = strlen(fmt) - 2*nr_args; | |
156 | ||
157 | if (!nr_args) { | |
158 | goto alloc_print; | |
159 | } | |
160 | ||
161 | va_copy(ap2, ap); | |
162 | ||
163 | iter = (char *)fmt; | |
164 | ||
165 | /* Now parse the format string */ | |
166 | for (iter = strstr(iter, "%"); iter; iter = strstr(iter, "%")) { | |
167 | iter++; | |
168 | switch (*iter) { | |
169 | case 'u': | |
170 | arg_uint = va_arg(ap2, unsigned int); | |
171 | len += number_to_string((void *)&arg_uint, 'u'); | |
172 | break; | |
173 | case 's': | |
174 | arg_char_ptr = va_arg(ap2, char *); | |
175 | len += strlen(arg_char_ptr); | |
176 | break; | |
177 | case 'c': | |
178 | len += 1; | |
179 | break; | |
180 | default: | |
181 | fprintf(stderr, | |
182 | "v9fs_string_alloc_printf:Incorrect format %c", *iter); | |
183 | return -1; | |
184 | } | |
185 | iter++; | |
186 | } | |
187 | ||
188 | alloc_print: | |
189 | *strp = qemu_malloc((len + 1) * sizeof(**strp)); | |
190 | ||
191 | return vsprintf(*strp, fmt, ap); | |
192 | } | |
193 | ||
194 | static void v9fs_string_sprintf(V9fsString *str, const char *fmt, ...) | |
195 | { | |
196 | va_list ap; | |
197 | int err; | |
198 | ||
199 | v9fs_string_free(str); | |
200 | ||
201 | va_start(ap, fmt); | |
202 | err = v9fs_string_alloc_printf(&str->data, fmt, ap); | |
203 | BUG_ON(err == -1); | |
204 | va_end(ap); | |
205 | ||
206 | str->size = err; | |
207 | } | |
208 | ||
209 | static void v9fs_string_copy(V9fsString *lhs, V9fsString *rhs) | |
210 | { | |
211 | v9fs_string_free(lhs); | |
212 | v9fs_string_sprintf(lhs, "%s", rhs->data); | |
213 | } | |
214 | ||
215 | static size_t v9fs_string_size(V9fsString *str) | |
216 | { | |
217 | return str->size; | |
218 | } | |
219 | ||
286d5652 AL |
220 | static V9fsFidState *lookup_fid(V9fsState *s, int32_t fid) |
221 | { | |
222 | V9fsFidState *f; | |
223 | ||
224 | for (f = s->fid_list; f; f = f->next) { | |
225 | if (f->fid == fid) { | |
226 | v9fs_do_setuid(s, f->uid); | |
227 | return f; | |
228 | } | |
229 | } | |
230 | ||
231 | return NULL; | |
232 | } | |
233 | ||
234 | static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid) | |
235 | { | |
236 | V9fsFidState *f; | |
237 | ||
238 | f = lookup_fid(s, fid); | |
239 | if (f) { | |
240 | return NULL; | |
241 | } | |
242 | ||
243 | f = qemu_mallocz(sizeof(V9fsFidState)); | |
244 | ||
245 | f->fid = fid; | |
246 | f->fd = -1; | |
247 | f->dir = NULL; | |
248 | ||
249 | f->next = s->fid_list; | |
250 | s->fid_list = f; | |
251 | ||
252 | return f; | |
253 | } | |
254 | ||
255 | static int free_fid(V9fsState *s, int32_t fid) | |
256 | { | |
257 | V9fsFidState **fidpp, *fidp; | |
258 | ||
259 | for (fidpp = &s->fid_list; *fidpp; fidpp = &(*fidpp)->next) { | |
260 | if ((*fidpp)->fid == fid) { | |
261 | break; | |
262 | } | |
263 | } | |
264 | ||
265 | if (*fidpp == NULL) { | |
266 | return -ENOENT; | |
267 | } | |
268 | ||
269 | fidp = *fidpp; | |
270 | *fidpp = fidp->next; | |
271 | ||
272 | if (fidp->fd != -1) { | |
273 | v9fs_do_close(s, fidp->fd); | |
274 | } | |
275 | if (fidp->dir) { | |
276 | v9fs_do_closedir(s, fidp->dir); | |
277 | } | |
278 | v9fs_string_free(&fidp->path); | |
279 | qemu_free(fidp); | |
280 | ||
281 | return 0; | |
282 | } | |
283 | ||
284 | #define P9_QID_TYPE_DIR 0x80 | |
285 | #define P9_QID_TYPE_SYMLINK 0x02 | |
286 | ||
287 | #define P9_STAT_MODE_DIR 0x80000000 | |
288 | #define P9_STAT_MODE_APPEND 0x40000000 | |
289 | #define P9_STAT_MODE_EXCL 0x20000000 | |
290 | #define P9_STAT_MODE_MOUNT 0x10000000 | |
291 | #define P9_STAT_MODE_AUTH 0x08000000 | |
292 | #define P9_STAT_MODE_TMP 0x04000000 | |
293 | #define P9_STAT_MODE_SYMLINK 0x02000000 | |
294 | #define P9_STAT_MODE_LINK 0x01000000 | |
295 | #define P9_STAT_MODE_DEVICE 0x00800000 | |
296 | #define P9_STAT_MODE_NAMED_PIPE 0x00200000 | |
297 | #define P9_STAT_MODE_SOCKET 0x00100000 | |
298 | #define P9_STAT_MODE_SETUID 0x00080000 | |
299 | #define P9_STAT_MODE_SETGID 0x00040000 | |
300 | #define P9_STAT_MODE_SETVTX 0x00010000 | |
301 | ||
302 | #define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \ | |
303 | P9_STAT_MODE_SYMLINK | \ | |
304 | P9_STAT_MODE_LINK | \ | |
305 | P9_STAT_MODE_DEVICE | \ | |
306 | P9_STAT_MODE_NAMED_PIPE | \ | |
307 | P9_STAT_MODE_SOCKET) | |
308 | ||
309 | /* This is the algorithm from ufs in spfs */ | |
310 | static void stat_to_qid(const struct stat *stbuf, V9fsQID *qidp) | |
311 | { | |
312 | size_t size; | |
313 | ||
314 | size = MIN(sizeof(stbuf->st_ino), sizeof(qidp->path)); | |
315 | memcpy(&qidp->path, &stbuf->st_ino, size); | |
316 | qidp->version = stbuf->st_mtime ^ (stbuf->st_size << 8); | |
317 | qidp->type = 0; | |
318 | if (S_ISDIR(stbuf->st_mode)) { | |
319 | qidp->type |= P9_QID_TYPE_DIR; | |
320 | } | |
321 | if (S_ISLNK(stbuf->st_mode)) { | |
322 | qidp->type |= P9_QID_TYPE_SYMLINK; | |
323 | } | |
324 | } | |
325 | ||
326 | static int fid_to_qid(V9fsState *s, V9fsFidState *fidp, V9fsQID *qidp) | |
327 | { | |
328 | struct stat stbuf; | |
329 | int err; | |
330 | ||
331 | err = v9fs_do_lstat(s, &fidp->path, &stbuf); | |
332 | if (err) { | |
333 | return err; | |
334 | } | |
335 | ||
336 | stat_to_qid(&stbuf, qidp); | |
337 | return 0; | |
338 | } | |
339 | ||
9f107513 AL |
340 | static V9fsPDU *alloc_pdu(V9fsState *s) |
341 | { | |
342 | V9fsPDU *pdu = NULL; | |
343 | ||
344 | if (!QLIST_EMPTY(&s->free_list)) { | |
345 | pdu = QLIST_FIRST(&s->free_list); | |
346 | QLIST_REMOVE(pdu, next); | |
347 | } | |
348 | return pdu; | |
349 | } | |
350 | ||
351 | static void free_pdu(V9fsState *s, V9fsPDU *pdu) | |
352 | { | |
353 | if (pdu) { | |
354 | QLIST_INSERT_HEAD(&s->free_list, pdu, next); | |
355 | } | |
356 | } | |
357 | ||
358 | size_t pdu_packunpack(void *addr, struct iovec *sg, int sg_count, | |
359 | size_t offset, size_t size, int pack) | |
360 | { | |
361 | int i = 0; | |
362 | size_t copied = 0; | |
363 | ||
364 | for (i = 0; size && i < sg_count; i++) { | |
365 | size_t len; | |
366 | if (offset >= sg[i].iov_len) { | |
367 | /* skip this sg */ | |
368 | offset -= sg[i].iov_len; | |
369 | continue; | |
370 | } else { | |
371 | len = MIN(sg[i].iov_len - offset, size); | |
372 | if (pack) { | |
373 | memcpy(sg[i].iov_base + offset, addr, len); | |
374 | } else { | |
375 | memcpy(addr, sg[i].iov_base + offset, len); | |
376 | } | |
377 | size -= len; | |
378 | copied += len; | |
379 | addr += len; | |
380 | if (size) { | |
381 | offset = 0; | |
382 | continue; | |
383 | } | |
384 | } | |
385 | } | |
386 | ||
387 | return copied; | |
388 | } | |
389 | ||
405a549a AL |
390 | static size_t pdu_unpack(void *dst, V9fsPDU *pdu, size_t offset, size_t size) |
391 | { | |
392 | return pdu_packunpack(dst, pdu->elem.out_sg, pdu->elem.out_num, | |
393 | offset, size, 0); | |
394 | } | |
395 | ||
396 | static size_t pdu_pack(V9fsPDU *pdu, size_t offset, const void *src, | |
397 | size_t size) | |
398 | { | |
399 | return pdu_packunpack((void *)src, pdu->elem.in_sg, pdu->elem.in_num, | |
400 | offset, size, 1); | |
401 | } | |
402 | ||
403 | static int pdu_copy_sg(V9fsPDU *pdu, size_t offset, int rx, struct iovec *sg) | |
404 | { | |
405 | size_t pos = 0; | |
406 | int i, j; | |
407 | struct iovec *src_sg; | |
408 | unsigned int num; | |
409 | ||
410 | if (rx) { | |
411 | src_sg = pdu->elem.in_sg; | |
412 | num = pdu->elem.in_num; | |
413 | } else { | |
414 | src_sg = pdu->elem.out_sg; | |
415 | num = pdu->elem.out_num; | |
416 | } | |
417 | ||
418 | j = 0; | |
419 | for (i = 0; i < num; i++) { | |
420 | if (offset <= pos) { | |
421 | sg[j].iov_base = src_sg[i].iov_base; | |
422 | sg[j].iov_len = src_sg[i].iov_len; | |
423 | j++; | |
424 | } else if (offset < (src_sg[i].iov_len + pos)) { | |
425 | sg[j].iov_base = src_sg[i].iov_base; | |
426 | sg[j].iov_len = src_sg[i].iov_len; | |
427 | sg[j].iov_base += (offset - pos); | |
428 | sg[j].iov_len -= (offset - pos); | |
429 | j++; | |
430 | } | |
431 | pos += src_sg[i].iov_len; | |
432 | } | |
433 | ||
434 | return j; | |
435 | } | |
436 | ||
437 | static size_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) | |
438 | { | |
439 | size_t old_offset = offset; | |
440 | va_list ap; | |
441 | int i; | |
442 | ||
443 | va_start(ap, fmt); | |
444 | for (i = 0; fmt[i]; i++) { | |
445 | switch (fmt[i]) { | |
446 | case 'b': { | |
447 | uint8_t *valp = va_arg(ap, uint8_t *); | |
448 | offset += pdu_unpack(valp, pdu, offset, sizeof(*valp)); | |
449 | break; | |
450 | } | |
451 | case 'w': { | |
452 | uint16_t val, *valp; | |
453 | valp = va_arg(ap, uint16_t *); | |
454 | val = le16_to_cpupu(valp); | |
455 | offset += pdu_unpack(&val, pdu, offset, sizeof(val)); | |
456 | *valp = val; | |
457 | break; | |
458 | } | |
459 | case 'd': { | |
460 | uint32_t val, *valp; | |
461 | valp = va_arg(ap, uint32_t *); | |
462 | val = le32_to_cpupu(valp); | |
463 | offset += pdu_unpack(&val, pdu, offset, sizeof(val)); | |
464 | *valp = val; | |
465 | break; | |
466 | } | |
467 | case 'q': { | |
468 | uint64_t val, *valp; | |
469 | valp = va_arg(ap, uint64_t *); | |
470 | val = le64_to_cpup(valp); | |
471 | offset += pdu_unpack(&val, pdu, offset, sizeof(val)); | |
472 | *valp = val; | |
473 | break; | |
474 | } | |
475 | case 'v': { | |
476 | struct iovec *iov = va_arg(ap, struct iovec *); | |
477 | int *iovcnt = va_arg(ap, int *); | |
478 | *iovcnt = pdu_copy_sg(pdu, offset, 0, iov); | |
479 | break; | |
480 | } | |
481 | case 's': { | |
482 | V9fsString *str = va_arg(ap, V9fsString *); | |
483 | offset += pdu_unmarshal(pdu, offset, "w", &str->size); | |
484 | /* FIXME: sanity check str->size */ | |
485 | str->data = qemu_malloc(str->size + 1); | |
486 | offset += pdu_unpack(str->data, pdu, offset, str->size); | |
487 | str->data[str->size] = 0; | |
488 | break; | |
489 | } | |
490 | case 'Q': { | |
491 | V9fsQID *qidp = va_arg(ap, V9fsQID *); | |
492 | offset += pdu_unmarshal(pdu, offset, "bdq", | |
493 | &qidp->type, &qidp->version, &qidp->path); | |
494 | break; | |
495 | } | |
496 | case 'S': { | |
497 | V9fsStat *statp = va_arg(ap, V9fsStat *); | |
498 | offset += pdu_unmarshal(pdu, offset, "wwdQdddqsssssddd", | |
499 | &statp->size, &statp->type, &statp->dev, | |
500 | &statp->qid, &statp->mode, &statp->atime, | |
501 | &statp->mtime, &statp->length, | |
502 | &statp->name, &statp->uid, &statp->gid, | |
503 | &statp->muid, &statp->extension, | |
504 | &statp->n_uid, &statp->n_gid, | |
505 | &statp->n_muid); | |
506 | break; | |
507 | } | |
508 | default: | |
509 | break; | |
510 | } | |
511 | } | |
512 | ||
513 | va_end(ap); | |
514 | ||
515 | return offset - old_offset; | |
516 | } | |
517 | ||
518 | static size_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) | |
519 | { | |
520 | size_t old_offset = offset; | |
521 | va_list ap; | |
522 | int i; | |
523 | ||
524 | va_start(ap, fmt); | |
525 | for (i = 0; fmt[i]; i++) { | |
526 | switch (fmt[i]) { | |
527 | case 'b': { | |
528 | uint8_t val = va_arg(ap, int); | |
529 | offset += pdu_pack(pdu, offset, &val, sizeof(val)); | |
530 | break; | |
531 | } | |
532 | case 'w': { | |
533 | uint16_t val; | |
534 | cpu_to_le16w(&val, va_arg(ap, int)); | |
535 | offset += pdu_pack(pdu, offset, &val, sizeof(val)); | |
536 | break; | |
537 | } | |
538 | case 'd': { | |
539 | uint32_t val; | |
540 | cpu_to_le32w(&val, va_arg(ap, uint32_t)); | |
541 | offset += pdu_pack(pdu, offset, &val, sizeof(val)); | |
542 | break; | |
543 | } | |
544 | case 'q': { | |
545 | uint64_t val; | |
546 | cpu_to_le64w(&val, va_arg(ap, uint64_t)); | |
547 | offset += pdu_pack(pdu, offset, &val, sizeof(val)); | |
548 | break; | |
549 | } | |
550 | case 'v': { | |
551 | struct iovec *iov = va_arg(ap, struct iovec *); | |
552 | int *iovcnt = va_arg(ap, int *); | |
553 | *iovcnt = pdu_copy_sg(pdu, offset, 1, iov); | |
554 | break; | |
555 | } | |
556 | case 's': { | |
557 | V9fsString *str = va_arg(ap, V9fsString *); | |
558 | offset += pdu_marshal(pdu, offset, "w", str->size); | |
559 | offset += pdu_pack(pdu, offset, str->data, str->size); | |
560 | break; | |
561 | } | |
562 | case 'Q': { | |
563 | V9fsQID *qidp = va_arg(ap, V9fsQID *); | |
564 | offset += pdu_marshal(pdu, offset, "bdq", | |
565 | qidp->type, qidp->version, qidp->path); | |
566 | break; | |
567 | } | |
568 | case 'S': { | |
569 | V9fsStat *statp = va_arg(ap, V9fsStat *); | |
570 | offset += pdu_marshal(pdu, offset, "wwdQdddqsssssddd", | |
571 | statp->size, statp->type, statp->dev, | |
572 | &statp->qid, statp->mode, statp->atime, | |
573 | statp->mtime, statp->length, &statp->name, | |
574 | &statp->uid, &statp->gid, &statp->muid, | |
575 | &statp->extension, statp->n_uid, | |
576 | statp->n_gid, statp->n_muid); | |
577 | break; | |
578 | } | |
579 | default: | |
580 | break; | |
581 | } | |
582 | } | |
583 | va_end(ap); | |
584 | ||
585 | return offset - old_offset; | |
586 | } | |
587 | ||
588 | static void complete_pdu(V9fsState *s, V9fsPDU *pdu, ssize_t len) | |
589 | { | |
590 | int8_t id = pdu->id + 1; /* Response */ | |
591 | ||
592 | if (len < 0) { | |
593 | V9fsString str; | |
594 | int err = -len; | |
595 | ||
596 | str.data = strerror(err); | |
597 | str.size = strlen(str.data); | |
598 | ||
599 | len = 7; | |
600 | len += pdu_marshal(pdu, len, "s", &str); | |
601 | if (dotu) { | |
602 | len += pdu_marshal(pdu, len, "d", err); | |
603 | } | |
604 | ||
605 | id = P9_RERROR; | |
606 | } | |
607 | ||
608 | /* fill out the header */ | |
609 | pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag); | |
610 | ||
611 | /* keep these in sync */ | |
612 | pdu->size = len; | |
613 | pdu->id = id; | |
614 | ||
615 | /* push onto queue and notify */ | |
616 | virtqueue_push(s->vq, &pdu->elem, len); | |
617 | ||
618 | /* FIXME: we should batch these completions */ | |
619 | virtio_notify(&s->vdev, s->vq); | |
620 | ||
621 | free_pdu(s, pdu); | |
622 | } | |
623 | ||
bb9e3216 AL |
624 | static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension) |
625 | { | |
626 | mode_t ret; | |
627 | ||
628 | ret = mode & 0777; | |
629 | if (mode & P9_STAT_MODE_DIR) { | |
630 | ret |= S_IFDIR; | |
631 | } | |
632 | ||
633 | if (dotu) { | |
634 | if (mode & P9_STAT_MODE_SYMLINK) { | |
635 | ret |= S_IFLNK; | |
636 | } | |
637 | if (mode & P9_STAT_MODE_SOCKET) { | |
638 | ret |= S_IFSOCK; | |
639 | } | |
640 | if (mode & P9_STAT_MODE_NAMED_PIPE) { | |
641 | ret |= S_IFIFO; | |
642 | } | |
643 | if (mode & P9_STAT_MODE_DEVICE) { | |
644 | if (extension && extension->data[0] == 'c') { | |
645 | ret |= S_IFCHR; | |
646 | } else { | |
647 | ret |= S_IFBLK; | |
648 | } | |
649 | } | |
650 | } | |
651 | ||
652 | if (!(ret&~0777)) { | |
653 | ret |= S_IFREG; | |
654 | } | |
655 | ||
656 | if (mode & P9_STAT_MODE_SETUID) { | |
657 | ret |= S_ISUID; | |
658 | } | |
659 | if (mode & P9_STAT_MODE_SETGID) { | |
660 | ret |= S_ISGID; | |
661 | } | |
662 | if (mode & P9_STAT_MODE_SETVTX) { | |
663 | ret |= S_ISVTX; | |
664 | } | |
665 | ||
666 | return ret; | |
667 | } | |
668 | ||
669 | static int donttouch_stat(V9fsStat *stat) | |
670 | { | |
671 | if (stat->type == -1 && | |
672 | stat->dev == -1 && | |
673 | stat->qid.type == -1 && | |
674 | stat->qid.version == -1 && | |
675 | stat->qid.path == -1 && | |
676 | stat->mode == -1 && | |
677 | stat->atime == -1 && | |
678 | stat->mtime == -1 && | |
679 | stat->length == -1 && | |
680 | !stat->name.size && | |
681 | !stat->uid.size && | |
682 | !stat->gid.size && | |
683 | !stat->muid.size && | |
684 | stat->n_uid == -1 && | |
685 | stat->n_gid == -1 && | |
686 | stat->n_muid == -1) { | |
687 | return 1; | |
688 | } | |
689 | ||
690 | return 0; | |
691 | } | |
692 | ||
693 | static void v9fs_stat_free(V9fsStat *stat) | |
694 | { | |
695 | v9fs_string_free(&stat->name); | |
696 | v9fs_string_free(&stat->uid); | |
697 | v9fs_string_free(&stat->gid); | |
698 | v9fs_string_free(&stat->muid); | |
699 | v9fs_string_free(&stat->extension); | |
700 | } | |
701 | ||
702 | static uint32_t stat_to_v9mode(const struct stat *stbuf) | |
703 | { | |
704 | uint32_t mode; | |
705 | ||
706 | mode = stbuf->st_mode & 0777; | |
707 | if (S_ISDIR(stbuf->st_mode)) { | |
708 | mode |= P9_STAT_MODE_DIR; | |
709 | } | |
710 | ||
711 | if (dotu) { | |
712 | if (S_ISLNK(stbuf->st_mode)) { | |
713 | mode |= P9_STAT_MODE_SYMLINK; | |
714 | } | |
715 | ||
716 | if (S_ISSOCK(stbuf->st_mode)) { | |
717 | mode |= P9_STAT_MODE_SOCKET; | |
718 | } | |
719 | ||
720 | if (S_ISFIFO(stbuf->st_mode)) { | |
721 | mode |= P9_STAT_MODE_NAMED_PIPE; | |
722 | } | |
723 | ||
724 | if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) { | |
725 | mode |= P9_STAT_MODE_DEVICE; | |
726 | } | |
727 | ||
728 | if (stbuf->st_mode & S_ISUID) { | |
729 | mode |= P9_STAT_MODE_SETUID; | |
730 | } | |
731 | ||
732 | if (stbuf->st_mode & S_ISGID) { | |
733 | mode |= P9_STAT_MODE_SETGID; | |
734 | } | |
735 | ||
736 | if (stbuf->st_mode & S_ISVTX) { | |
737 | mode |= P9_STAT_MODE_SETVTX; | |
738 | } | |
739 | } | |
740 | ||
741 | return mode; | |
742 | } | |
743 | ||
744 | static int stat_to_v9stat(V9fsState *s, V9fsString *name, | |
745 | const struct stat *stbuf, | |
746 | V9fsStat *v9stat) | |
747 | { | |
748 | int err; | |
749 | const char *str; | |
750 | ||
751 | memset(v9stat, 0, sizeof(*v9stat)); | |
752 | ||
753 | stat_to_qid(stbuf, &v9stat->qid); | |
754 | v9stat->mode = stat_to_v9mode(stbuf); | |
755 | v9stat->atime = stbuf->st_atime; | |
756 | v9stat->mtime = stbuf->st_mtime; | |
757 | v9stat->length = stbuf->st_size; | |
758 | ||
759 | v9fs_string_null(&v9stat->uid); | |
760 | v9fs_string_null(&v9stat->gid); | |
761 | v9fs_string_null(&v9stat->muid); | |
762 | ||
763 | if (dotu) { | |
764 | v9stat->n_uid = stbuf->st_uid; | |
765 | v9stat->n_gid = stbuf->st_gid; | |
766 | v9stat->n_muid = 0; | |
767 | ||
768 | v9fs_string_null(&v9stat->extension); | |
769 | ||
770 | if (v9stat->mode & P9_STAT_MODE_SYMLINK) { | |
771 | err = v9fs_do_readlink(s, name, &v9stat->extension); | |
772 | if (err == -1) { | |
773 | err = -errno; | |
774 | return err; | |
775 | } | |
776 | v9stat->extension.data[err] = 0; | |
777 | v9stat->extension.size = err; | |
778 | } else if (v9stat->mode & P9_STAT_MODE_DEVICE) { | |
779 | v9fs_string_sprintf(&v9stat->extension, "%c %u %u", | |
780 | S_ISCHR(stbuf->st_mode) ? 'c' : 'b', | |
781 | major(stbuf->st_rdev), minor(stbuf->st_rdev)); | |
782 | } else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) { | |
783 | v9fs_string_sprintf(&v9stat->extension, "%s %u", | |
784 | "HARDLINKCOUNT", stbuf->st_nlink); | |
785 | } | |
786 | } | |
787 | ||
788 | str = strrchr(name->data, '/'); | |
789 | if (str) { | |
790 | str += 1; | |
791 | } else { | |
792 | str = name->data; | |
793 | } | |
794 | ||
795 | v9fs_string_sprintf(&v9stat->name, "%s", str); | |
796 | ||
797 | v9stat->size = 61 + | |
798 | v9fs_string_size(&v9stat->name) + | |
799 | v9fs_string_size(&v9stat->uid) + | |
800 | v9fs_string_size(&v9stat->gid) + | |
801 | v9fs_string_size(&v9stat->muid) + | |
802 | v9fs_string_size(&v9stat->extension); | |
803 | return 0; | |
804 | } | |
805 | ||
1f5a89bf AL |
806 | static struct iovec *adjust_sg(struct iovec *sg, int len, int *iovcnt) |
807 | { | |
808 | while (len && *iovcnt) { | |
809 | if (len < sg->iov_len) { | |
810 | sg->iov_len -= len; | |
811 | sg->iov_base += len; | |
812 | len = 0; | |
813 | } else { | |
814 | len -= sg->iov_len; | |
815 | sg++; | |
816 | *iovcnt -= 1; | |
817 | } | |
818 | } | |
819 | ||
820 | return sg; | |
821 | } | |
822 | ||
823 | static struct iovec *cap_sg(struct iovec *sg, int cap, int *cnt) | |
824 | { | |
825 | int i; | |
826 | int total = 0; | |
827 | ||
828 | for (i = 0; i < *cnt; i++) { | |
829 | if ((total + sg[i].iov_len) > cap) { | |
830 | sg[i].iov_len -= ((total + sg[i].iov_len) - cap); | |
831 | i++; | |
832 | break; | |
833 | } | |
834 | total += sg[i].iov_len; | |
835 | } | |
836 | ||
837 | *cnt = i; | |
838 | ||
839 | return sg; | |
840 | } | |
841 | ||
842 | static void print_sg(struct iovec *sg, int cnt) | |
843 | { | |
844 | int i; | |
845 | ||
846 | printf("sg[%d]: {", cnt); | |
847 | for (i = 0; i < cnt; i++) { | |
848 | if (i) { | |
849 | printf(", "); | |
850 | } | |
851 | printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len); | |
852 | } | |
853 | printf("}\n"); | |
854 | } | |
855 | ||
405a549a AL |
856 | static void v9fs_dummy(V9fsState *s, V9fsPDU *pdu) |
857 | { | |
858 | /* Note: The following have been added to prevent GCC from complaining | |
859 | * They will be removed in the subsequent patches */ | |
860 | (void)pdu_unmarshal; | |
861 | (void) complete_pdu; | |
a03f7874 AL |
862 | (void) v9fs_string_init; |
863 | (void) v9fs_string_free; | |
864 | (void) v9fs_string_null; | |
865 | (void) v9fs_string_sprintf; | |
866 | (void) v9fs_string_copy; | |
867 | (void) v9fs_string_size; | |
131dcb25 AL |
868 | (void) v9fs_do_lstat; |
869 | (void) v9fs_do_setuid; | |
870 | (void) v9fs_do_readlink; | |
871 | (void) v9fs_do_close; | |
872 | (void) v9fs_do_closedir; | |
286d5652 AL |
873 | (void) alloc_fid; |
874 | (void) free_fid; | |
875 | (void) fid_to_qid; | |
bb9e3216 AL |
876 | (void) v9mode_to_mode; |
877 | (void) donttouch_stat; | |
878 | (void) v9fs_stat_free; | |
879 | (void) stat_to_v9stat; | |
1f5a89bf AL |
880 | (void) adjust_sg; |
881 | (void) cap_sg; | |
882 | (void) print_sg; | |
405a549a | 883 | } |
131dcb25 | 884 | |
9f107513 AL |
885 | static void v9fs_version(V9fsState *s, V9fsPDU *pdu) |
886 | { | |
92c1ad03 AL |
887 | int32_t msize; |
888 | V9fsString version; | |
889 | size_t offset = 7; | |
890 | ||
891 | pdu_unmarshal(pdu, offset, "ds", &msize, &version); | |
892 | ||
893 | if (strcmp(version.data, "9P2000.u")) { | |
894 | v9fs_string_sprintf(&version, "unknown"); | |
9f107513 | 895 | } |
92c1ad03 AL |
896 | |
897 | offset += pdu_marshal(pdu, offset, "ds", msize, &version); | |
898 | complete_pdu(s, pdu, offset); | |
899 | ||
900 | v9fs_string_free(&version); | |
9f107513 AL |
901 | } |
902 | ||
903 | static void v9fs_attach(V9fsState *s, V9fsPDU *pdu) | |
904 | { | |
955efc47 AL |
905 | int32_t fid, afid, n_uname; |
906 | V9fsString uname, aname; | |
907 | V9fsFidState *fidp; | |
908 | V9fsQID qid; | |
909 | size_t offset = 7; | |
910 | ssize_t err; | |
911 | ||
912 | pdu_unmarshal(pdu, offset, "ddssd", &fid, &afid, &uname, &aname, &n_uname); | |
913 | ||
914 | fidp = alloc_fid(s, fid); | |
915 | if (fidp == NULL) { | |
916 | err = -EINVAL; | |
917 | goto out; | |
9f107513 | 918 | } |
955efc47 AL |
919 | |
920 | fidp->uid = n_uname; | |
921 | ||
922 | v9fs_string_sprintf(&fidp->path, "%s", "/"); | |
923 | err = fid_to_qid(s, fidp, &qid); | |
924 | if (err) { | |
925 | err = -EINVAL; | |
926 | free_fid(s, fid); | |
927 | goto out; | |
928 | } | |
929 | ||
930 | offset += pdu_marshal(pdu, offset, "Q", &qid); | |
931 | ||
932 | err = offset; | |
933 | out: | |
934 | complete_pdu(s, pdu, err); | |
935 | v9fs_string_free(&uname); | |
936 | v9fs_string_free(&aname); | |
9f107513 AL |
937 | } |
938 | ||
4da7d3fa AL |
939 | typedef struct V9fsStatState { |
940 | V9fsPDU *pdu; | |
941 | size_t offset; | |
942 | V9fsStat v9stat; | |
943 | V9fsFidState *fidp; | |
944 | struct stat stbuf; | |
945 | } V9fsStatState; | |
946 | ||
947 | static void v9fs_stat_post_lstat(V9fsState *s, V9fsStatState *vs, int err) | |
948 | { | |
949 | if (err == -1) { | |
950 | err = -errno; | |
951 | goto out; | |
952 | } | |
953 | ||
954 | err = stat_to_v9stat(s, &vs->fidp->path, &vs->stbuf, &vs->v9stat); | |
955 | if (err) { | |
956 | goto out; | |
957 | } | |
958 | vs->offset += pdu_marshal(vs->pdu, vs->offset, "wS", 0, &vs->v9stat); | |
959 | err = vs->offset; | |
960 | ||
961 | out: | |
962 | complete_pdu(s, vs->pdu, err); | |
963 | v9fs_stat_free(&vs->v9stat); | |
964 | qemu_free(vs); | |
965 | } | |
966 | ||
9f107513 AL |
967 | static void v9fs_stat(V9fsState *s, V9fsPDU *pdu) |
968 | { | |
4da7d3fa AL |
969 | int32_t fid; |
970 | V9fsStatState *vs; | |
971 | ssize_t err = 0; | |
972 | ||
973 | vs = qemu_malloc(sizeof(*vs)); | |
974 | vs->pdu = pdu; | |
975 | vs->offset = 7; | |
976 | ||
977 | memset(&vs->v9stat, 0, sizeof(vs->v9stat)); | |
978 | ||
979 | pdu_unmarshal(vs->pdu, vs->offset, "d", &fid); | |
980 | ||
981 | vs->fidp = lookup_fid(s, fid); | |
982 | if (vs->fidp == NULL) { | |
983 | err = -ENOENT; | |
984 | goto out; | |
9f107513 | 985 | } |
4da7d3fa AL |
986 | |
987 | err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf); | |
988 | v9fs_stat_post_lstat(s, vs, err); | |
989 | return; | |
990 | ||
991 | out: | |
992 | complete_pdu(s, vs->pdu, err); | |
993 | v9fs_stat_free(&vs->v9stat); | |
994 | qemu_free(vs); | |
9f107513 AL |
995 | } |
996 | ||
ff5e54c9 AL |
997 | typedef struct V9fsWalkState { |
998 | V9fsPDU *pdu; | |
999 | size_t offset; | |
1000 | int16_t nwnames; | |
1001 | int name_idx; | |
1002 | V9fsQID *qids; | |
1003 | V9fsFidState *fidp; | |
1004 | V9fsFidState *newfidp; | |
1005 | V9fsString path; | |
1006 | V9fsString *wnames; | |
1007 | struct stat stbuf; | |
1008 | } V9fsWalkState; | |
1009 | ||
1010 | static void v9fs_walk_complete(V9fsState *s, V9fsWalkState *vs, int err) | |
1011 | { | |
1012 | complete_pdu(s, vs->pdu, err); | |
1013 | ||
1014 | if (vs->nwnames) { | |
1015 | for (vs->name_idx = 0; vs->name_idx < vs->nwnames; vs->name_idx++) { | |
1016 | v9fs_string_free(&vs->wnames[vs->name_idx]); | |
1017 | } | |
1018 | ||
1019 | qemu_free(vs->wnames); | |
1020 | qemu_free(vs->qids); | |
1021 | } | |
1022 | } | |
1023 | ||
1024 | static void v9fs_walk_marshal(V9fsWalkState *vs) | |
1025 | { | |
1026 | int i; | |
1027 | vs->offset = 7; | |
1028 | vs->offset += pdu_marshal(vs->pdu, vs->offset, "w", vs->nwnames); | |
1029 | ||
1030 | for (i = 0; i < vs->nwnames; i++) { | |
1031 | vs->offset += pdu_marshal(vs->pdu, vs->offset, "Q", &vs->qids[i]); | |
1032 | } | |
1033 | } | |
1034 | ||
1035 | static void v9fs_walk_post_newfid_lstat(V9fsState *s, V9fsWalkState *vs, | |
1036 | int err) | |
1037 | { | |
1038 | if (err == -1) { | |
1039 | free_fid(s, vs->newfidp->fid); | |
1040 | v9fs_string_free(&vs->path); | |
1041 | err = -ENOENT; | |
1042 | goto out; | |
1043 | } | |
1044 | ||
1045 | stat_to_qid(&vs->stbuf, &vs->qids[vs->name_idx]); | |
1046 | ||
1047 | vs->name_idx++; | |
1048 | if (vs->name_idx < vs->nwnames) { | |
1049 | v9fs_string_sprintf(&vs->path, "%s/%s", vs->newfidp->path.data, | |
1050 | vs->wnames[vs->name_idx].data); | |
1051 | v9fs_string_copy(&vs->newfidp->path, &vs->path); | |
1052 | ||
1053 | err = v9fs_do_lstat(s, &vs->newfidp->path, &vs->stbuf); | |
1054 | v9fs_walk_post_newfid_lstat(s, vs, err); | |
1055 | return; | |
1056 | } | |
1057 | ||
1058 | v9fs_string_free(&vs->path); | |
1059 | v9fs_walk_marshal(vs); | |
1060 | err = vs->offset; | |
1061 | out: | |
1062 | v9fs_walk_complete(s, vs, err); | |
1063 | } | |
1064 | ||
1065 | static void v9fs_walk_post_oldfid_lstat(V9fsState *s, V9fsWalkState *vs, | |
1066 | int err) | |
1067 | { | |
1068 | if (err == -1) { | |
1069 | v9fs_string_free(&vs->path); | |
1070 | err = -ENOENT; | |
1071 | goto out; | |
1072 | } | |
1073 | ||
1074 | stat_to_qid(&vs->stbuf, &vs->qids[vs->name_idx]); | |
1075 | vs->name_idx++; | |
1076 | if (vs->name_idx < vs->nwnames) { | |
1077 | ||
1078 | v9fs_string_sprintf(&vs->path, "%s/%s", | |
1079 | vs->fidp->path.data, vs->wnames[vs->name_idx].data); | |
1080 | v9fs_string_copy(&vs->fidp->path, &vs->path); | |
1081 | ||
1082 | err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf); | |
1083 | v9fs_walk_post_oldfid_lstat(s, vs, err); | |
1084 | return; | |
1085 | } | |
1086 | ||
1087 | v9fs_string_free(&vs->path); | |
1088 | v9fs_walk_marshal(vs); | |
1089 | err = vs->offset; | |
1090 | out: | |
1091 | v9fs_walk_complete(s, vs, err); | |
1092 | } | |
1093 | ||
9f107513 AL |
1094 | static void v9fs_walk(V9fsState *s, V9fsPDU *pdu) |
1095 | { | |
ff5e54c9 AL |
1096 | int32_t fid, newfid; |
1097 | V9fsWalkState *vs; | |
1098 | int err = 0; | |
1099 | int i; | |
1100 | ||
1101 | vs = qemu_malloc(sizeof(*vs)); | |
1102 | vs->pdu = pdu; | |
1103 | vs->wnames = NULL; | |
1104 | vs->qids = NULL; | |
1105 | vs->offset = 7; | |
1106 | ||
1107 | vs->offset += pdu_unmarshal(vs->pdu, vs->offset, "ddw", &fid, | |
1108 | &newfid, &vs->nwnames); | |
1109 | ||
1110 | if (vs->nwnames) { | |
1111 | vs->wnames = qemu_mallocz(sizeof(vs->wnames[0]) * vs->nwnames); | |
1112 | ||
1113 | vs->qids = qemu_mallocz(sizeof(vs->qids[0]) * vs->nwnames); | |
1114 | ||
1115 | for (i = 0; i < vs->nwnames; i++) { | |
1116 | vs->offset += pdu_unmarshal(vs->pdu, vs->offset, "s", | |
1117 | &vs->wnames[i]); | |
1118 | } | |
1119 | } | |
1120 | ||
1121 | vs->fidp = lookup_fid(s, fid); | |
1122 | if (vs->fidp == NULL) { | |
1123 | err = -ENOENT; | |
1124 | goto out; | |
1125 | } | |
1126 | ||
1127 | /* FIXME: is this really valid? */ | |
1128 | if (fid == newfid) { | |
1129 | ||
1130 | BUG_ON(vs->fidp->fd != -1); | |
1131 | BUG_ON(vs->fidp->dir); | |
1132 | v9fs_string_init(&vs->path); | |
1133 | vs->name_idx = 0; | |
1134 | ||
1135 | if (vs->name_idx < vs->nwnames) { | |
1136 | v9fs_string_sprintf(&vs->path, "%s/%s", | |
1137 | vs->fidp->path.data, vs->wnames[vs->name_idx].data); | |
1138 | v9fs_string_copy(&vs->fidp->path, &vs->path); | |
1139 | ||
1140 | err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf); | |
1141 | v9fs_walk_post_oldfid_lstat(s, vs, err); | |
1142 | return; | |
1143 | } | |
1144 | } else { | |
1145 | vs->newfidp = alloc_fid(s, newfid); | |
1146 | if (vs->newfidp == NULL) { | |
1147 | err = -EINVAL; | |
1148 | goto out; | |
1149 | } | |
1150 | ||
1151 | vs->newfidp->uid = vs->fidp->uid; | |
1152 | v9fs_string_init(&vs->path); | |
1153 | vs->name_idx = 0; | |
1154 | v9fs_string_copy(&vs->newfidp->path, &vs->fidp->path); | |
1155 | ||
1156 | if (vs->name_idx < vs->nwnames) { | |
1157 | v9fs_string_sprintf(&vs->path, "%s/%s", vs->newfidp->path.data, | |
1158 | vs->wnames[vs->name_idx].data); | |
1159 | v9fs_string_copy(&vs->newfidp->path, &vs->path); | |
1160 | ||
1161 | err = v9fs_do_lstat(s, &vs->newfidp->path, &vs->stbuf); | |
1162 | v9fs_walk_post_newfid_lstat(s, vs, err); | |
1163 | return; | |
1164 | } | |
9f107513 | 1165 | } |
ff5e54c9 AL |
1166 | |
1167 | v9fs_walk_marshal(vs); | |
1168 | err = vs->offset; | |
1169 | out: | |
1170 | v9fs_walk_complete(s, vs, err); | |
9f107513 AL |
1171 | } |
1172 | ||
a6568fe2 AL |
1173 | typedef struct V9fsOpenState { |
1174 | V9fsPDU *pdu; | |
1175 | size_t offset; | |
1176 | int8_t mode; | |
1177 | V9fsFidState *fidp; | |
1178 | V9fsQID qid; | |
1179 | struct stat stbuf; | |
1180 | ||
1181 | } V9fsOpenState; | |
1182 | ||
1183 | enum { | |
1184 | Oread = 0x00, | |
1185 | Owrite = 0x01, | |
1186 | Ordwr = 0x02, | |
1187 | Oexec = 0x03, | |
1188 | Oexcl = 0x04, | |
1189 | Otrunc = 0x10, | |
1190 | Orexec = 0x20, | |
1191 | Orclose = 0x40, | |
1192 | Oappend = 0x80, | |
1193 | }; | |
1194 | ||
1195 | static int omode_to_uflags(int8_t mode) | |
9f107513 | 1196 | { |
a6568fe2 AL |
1197 | int ret = 0; |
1198 | ||
1199 | switch (mode & 3) { | |
1200 | case Oread: | |
1201 | ret = O_RDONLY; | |
1202 | break; | |
1203 | case Ordwr: | |
1204 | ret = O_RDWR; | |
1205 | break; | |
1206 | case Owrite: | |
1207 | ret = O_WRONLY; | |
1208 | break; | |
1209 | case Oexec: | |
1210 | ret = O_RDONLY; | |
1211 | break; | |
1212 | } | |
1213 | ||
1214 | if (mode & Otrunc) { | |
1215 | ret |= O_TRUNC; | |
1216 | } | |
1217 | ||
1218 | if (mode & Oappend) { | |
1219 | ret |= O_APPEND; | |
9f107513 | 1220 | } |
a6568fe2 AL |
1221 | |
1222 | if (mode & Oexcl) { | |
1223 | ret |= O_EXCL; | |
1224 | } | |
1225 | ||
1226 | return ret; | |
1227 | } | |
1228 | ||
1229 | static void v9fs_open_post_opendir(V9fsState *s, V9fsOpenState *vs, int err) | |
1230 | { | |
1231 | if (vs->fidp->dir == NULL) { | |
1232 | err = -errno; | |
1233 | goto out; | |
1234 | } | |
1235 | ||
1236 | vs->offset += pdu_marshal(vs->pdu, vs->offset, "Qd", &vs->qid, 0); | |
1237 | err = vs->offset; | |
1238 | out: | |
1239 | complete_pdu(s, vs->pdu, err); | |
1240 | qemu_free(vs); | |
1241 | ||
1242 | } | |
1243 | ||
1244 | static void v9fs_open_post_open(V9fsState *s, V9fsOpenState *vs, int err) | |
1245 | { | |
1246 | if (vs->fidp->fd == -1) { | |
1247 | err = -errno; | |
1248 | goto out; | |
1249 | } | |
1250 | ||
1251 | vs->offset += pdu_marshal(vs->pdu, vs->offset, "Qd", &vs->qid, 0); | |
1252 | err = vs->offset; | |
1253 | out: | |
1254 | complete_pdu(s, vs->pdu, err); | |
1255 | qemu_free(vs); | |
1256 | } | |
1257 | ||
1258 | static void v9fs_open_post_lstat(V9fsState *s, V9fsOpenState *vs, int err) | |
1259 | { | |
1260 | if (err) { | |
1261 | err = -errno; | |
1262 | goto out; | |
1263 | } | |
1264 | ||
1265 | stat_to_qid(&vs->stbuf, &vs->qid); | |
1266 | ||
1267 | if (S_ISDIR(vs->stbuf.st_mode)) { | |
1268 | vs->fidp->dir = v9fs_do_opendir(s, &vs->fidp->path); | |
1269 | v9fs_open_post_opendir(s, vs, err); | |
1270 | } else { | |
1271 | vs->fidp->fd = v9fs_do_open(s, &vs->fidp->path, | |
1272 | omode_to_uflags(vs->mode)); | |
1273 | v9fs_open_post_open(s, vs, err); | |
1274 | } | |
1275 | return; | |
1276 | out: | |
1277 | complete_pdu(s, vs->pdu, err); | |
1278 | qemu_free(vs); | |
9f107513 AL |
1279 | } |
1280 | ||
1281 | static void v9fs_open(V9fsState *s, V9fsPDU *pdu) | |
a6568fe2 AL |
1282 | { |
1283 | int32_t fid; | |
1284 | V9fsOpenState *vs; | |
1285 | ssize_t err = 0; | |
1286 | ||
1287 | ||
1288 | vs = qemu_malloc(sizeof(*vs)); | |
1289 | vs->pdu = pdu; | |
1290 | vs->offset = 7; | |
1291 | ||
1292 | pdu_unmarshal(vs->pdu, vs->offset, "db", &fid, &vs->mode); | |
1293 | ||
1294 | vs->fidp = lookup_fid(s, fid); | |
1295 | if (vs->fidp == NULL) { | |
1296 | err = -ENOENT; | |
1297 | goto out; | |
1298 | } | |
1299 | ||
1300 | BUG_ON(vs->fidp->fd != -1); | |
1301 | BUG_ON(vs->fidp->dir); | |
1302 | ||
1303 | err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf); | |
1304 | ||
1305 | v9fs_open_post_lstat(s, vs, err); | |
1306 | return; | |
1307 | out: | |
1308 | complete_pdu(s, pdu, err); | |
1309 | qemu_free(vs); | |
1310 | } | |
1311 | ||
1312 | static void v9fs_clunk(V9fsState *s, V9fsPDU *pdu) | |
1313 | { | |
1314 | if (debug_9p_pdu) { | |
9f107513 | 1315 | pprint_pdu(pdu); |
a6568fe2 | 1316 | } |
9f107513 AL |
1317 | } |
1318 | ||
a9231555 AL |
1319 | typedef struct V9fsReadState { |
1320 | V9fsPDU *pdu; | |
1321 | size_t offset; | |
1322 | int32_t count; | |
1323 | int32_t total; | |
1324 | int64_t off; | |
1325 | V9fsFidState *fidp; | |
1326 | struct iovec iov[128]; /* FIXME: bad, bad, bad */ | |
1327 | struct iovec *sg; | |
1328 | off_t dir_pos; | |
1329 | struct dirent *dent; | |
1330 | struct stat stbuf; | |
1331 | V9fsString name; | |
1332 | V9fsStat v9stat; | |
1333 | int32_t len; | |
1334 | int32_t cnt; | |
1335 | int32_t max_count; | |
1336 | } V9fsReadState; | |
1337 | ||
1338 | static void v9fs_read_post_readdir(V9fsState *, V9fsReadState *, ssize_t); | |
1339 | ||
1340 | static void v9fs_read_post_seekdir(V9fsState *s, V9fsReadState *vs, ssize_t err) | |
1341 | { | |
1342 | if (err) { | |
1343 | goto out; | |
1344 | } | |
1345 | v9fs_stat_free(&vs->v9stat); | |
1346 | v9fs_string_free(&vs->name); | |
1347 | vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->count); | |
1348 | vs->offset += vs->count; | |
1349 | err = vs->offset; | |
1350 | out: | |
1351 | complete_pdu(s, vs->pdu, err); | |
1352 | qemu_free(vs); | |
1353 | return; | |
1354 | } | |
1355 | ||
1356 | static void v9fs_read_post_dir_lstat(V9fsState *s, V9fsReadState *vs, | |
1357 | ssize_t err) | |
1358 | { | |
1359 | if (err) { | |
1360 | err = -errno; | |
1361 | goto out; | |
1362 | } | |
1363 | err = stat_to_v9stat(s, &vs->name, &vs->stbuf, &vs->v9stat); | |
1364 | if (err) { | |
1365 | goto out; | |
1366 | } | |
1367 | ||
1368 | vs->len = pdu_marshal(vs->pdu, vs->offset + 4 + vs->count, "S", | |
1369 | &vs->v9stat); | |
1370 | if ((vs->len != (vs->v9stat.size + 2)) || | |
1371 | ((vs->count + vs->len) > vs->max_count)) { | |
1372 | v9fs_do_seekdir(s, vs->fidp->dir, vs->dir_pos); | |
1373 | v9fs_read_post_seekdir(s, vs, err); | |
1374 | return; | |
1375 | } | |
1376 | vs->count += vs->len; | |
1377 | v9fs_stat_free(&vs->v9stat); | |
1378 | v9fs_string_free(&vs->name); | |
1379 | vs->dir_pos = vs->dent->d_off; | |
1380 | vs->dent = v9fs_do_readdir(s, vs->fidp->dir); | |
1381 | v9fs_read_post_readdir(s, vs, err); | |
1382 | return; | |
1383 | out: | |
1384 | v9fs_do_seekdir(s, vs->fidp->dir, vs->dir_pos); | |
1385 | v9fs_read_post_seekdir(s, vs, err); | |
1386 | return; | |
1387 | ||
1388 | } | |
1389 | ||
1390 | static void v9fs_read_post_readdir(V9fsState *s, V9fsReadState *vs, ssize_t err) | |
1391 | { | |
1392 | if (vs->dent) { | |
1393 | memset(&vs->v9stat, 0, sizeof(vs->v9stat)); | |
1394 | v9fs_string_init(&vs->name); | |
1395 | v9fs_string_sprintf(&vs->name, "%s/%s", vs->fidp->path.data, | |
1396 | vs->dent->d_name); | |
1397 | err = v9fs_do_lstat(s, &vs->name, &vs->stbuf); | |
1398 | v9fs_read_post_dir_lstat(s, vs, err); | |
1399 | return; | |
1400 | } | |
1401 | ||
1402 | vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->count); | |
1403 | vs->offset += vs->count; | |
1404 | err = vs->offset; | |
1405 | complete_pdu(s, vs->pdu, err); | |
1406 | qemu_free(vs); | |
1407 | return; | |
1408 | } | |
1409 | ||
1410 | static void v9fs_read_post_telldir(V9fsState *s, V9fsReadState *vs, ssize_t err) | |
1411 | { | |
1412 | vs->dent = v9fs_do_readdir(s, vs->fidp->dir); | |
1413 | v9fs_read_post_readdir(s, vs, err); | |
1414 | return; | |
1415 | } | |
1416 | ||
1417 | static void v9fs_read_post_rewinddir(V9fsState *s, V9fsReadState *vs, | |
1418 | ssize_t err) | |
1419 | { | |
1420 | vs->dir_pos = v9fs_do_telldir(s, vs->fidp->dir); | |
1421 | v9fs_read_post_telldir(s, vs, err); | |
1422 | return; | |
1423 | } | |
1424 | ||
1425 | static void v9fs_read_post_readv(V9fsState *s, V9fsReadState *vs, ssize_t err) | |
1426 | { | |
1427 | if (err < 0) { | |
1428 | /* IO error return the error */ | |
1429 | err = -errno; | |
1430 | goto out; | |
1431 | } | |
1432 | vs->total += vs->len; | |
1433 | vs->sg = adjust_sg(vs->sg, vs->len, &vs->cnt); | |
1434 | if (vs->total < vs->count && vs->len > 0) { | |
1435 | do { | |
1436 | if (0) { | |
1437 | print_sg(vs->sg, vs->cnt); | |
1438 | } | |
1439 | vs->len = v9fs_do_readv(s, vs->fidp->fd, vs->sg, vs->cnt); | |
1440 | } while (vs->len == -1 && errno == EINTR); | |
1441 | if (vs->len == -1) { | |
1442 | err = -errno; | |
1443 | } | |
1444 | v9fs_read_post_readv(s, vs, err); | |
1445 | return; | |
1446 | } | |
1447 | vs->offset += pdu_marshal(vs->pdu, vs->offset, "d", vs->total); | |
1448 | vs->offset += vs->count; | |
1449 | err = vs->offset; | |
1450 | ||
1451 | out: | |
1452 | complete_pdu(s, vs->pdu, err); | |
1453 | qemu_free(vs); | |
1454 | } | |
1455 | ||
1456 | static void v9fs_read_post_lseek(V9fsState *s, V9fsReadState *vs, ssize_t err) | |
1457 | { | |
1458 | if (err == -1) { | |
1459 | err = -errno; | |
1460 | goto out; | |
1461 | } | |
1462 | vs->sg = cap_sg(vs->sg, vs->count, &vs->cnt); | |
1463 | ||
1464 | if (vs->total < vs->count) { | |
1465 | do { | |
1466 | if (0) { | |
1467 | print_sg(vs->sg, vs->cnt); | |
1468 | } | |
1469 | vs->len = v9fs_do_readv(s, vs->fidp->fd, vs->sg, vs->cnt); | |
1470 | } while (vs->len == -1 && errno == EINTR); | |
1471 | if (vs->len == -1) { | |
1472 | err = -errno; | |
1473 | } | |
1474 | v9fs_read_post_readv(s, vs, err); | |
1475 | return; | |
1476 | } | |
1477 | out: | |
1478 | complete_pdu(s, vs->pdu, err); | |
1479 | qemu_free(vs); | |
1480 | } | |
1481 | ||
9f107513 AL |
1482 | static void v9fs_read(V9fsState *s, V9fsPDU *pdu) |
1483 | { | |
a9231555 AL |
1484 | int32_t fid; |
1485 | V9fsReadState *vs; | |
1486 | ssize_t err = 0; | |
1487 | ||
1488 | vs = qemu_malloc(sizeof(*vs)); | |
1489 | vs->pdu = pdu; | |
1490 | vs->offset = 7; | |
1491 | vs->total = 0; | |
1492 | vs->len = 0; | |
1493 | vs->count = 0; | |
1494 | ||
1495 | pdu_unmarshal(vs->pdu, vs->offset, "dqd", &fid, &vs->off, &vs->count); | |
1496 | ||
1497 | vs->fidp = lookup_fid(s, fid); | |
1498 | if (vs->fidp == NULL) { | |
1499 | err = -EINVAL; | |
1500 | goto out; | |
1501 | } | |
1502 | ||
1503 | if (vs->fidp->dir) { | |
1504 | vs->max_count = vs->count; | |
1505 | vs->count = 0; | |
1506 | if (vs->off == 0) { | |
1507 | v9fs_do_rewinddir(s, vs->fidp->dir); | |
1508 | } | |
1509 | v9fs_read_post_rewinddir(s, vs, err); | |
1510 | return; | |
1511 | } else if (vs->fidp->fd != -1) { | |
1512 | vs->sg = vs->iov; | |
1513 | pdu_marshal(vs->pdu, vs->offset + 4, "v", vs->sg, &vs->cnt); | |
1514 | err = v9fs_do_lseek(s, vs->fidp->fd, vs->off, SEEK_SET); | |
1515 | v9fs_read_post_lseek(s, vs, err); | |
1516 | return; | |
1517 | } else { | |
1518 | err = -EINVAL; | |
9f107513 | 1519 | } |
a9231555 AL |
1520 | out: |
1521 | complete_pdu(s, pdu, err); | |
1522 | qemu_free(vs); | |
9f107513 AL |
1523 | } |
1524 | ||
1525 | static void v9fs_write(V9fsState *s, V9fsPDU *pdu) | |
1526 | { | |
1527 | if (debug_9p_pdu) { | |
1528 | pprint_pdu(pdu); | |
1529 | } | |
1530 | } | |
1531 | ||
1532 | static void v9fs_create(V9fsState *s, V9fsPDU *pdu) | |
1533 | { | |
1534 | if (debug_9p_pdu) { | |
1535 | pprint_pdu(pdu); | |
1536 | } | |
1537 | } | |
1538 | ||
1539 | static void v9fs_flush(V9fsState *s, V9fsPDU *pdu) | |
1540 | { | |
405a549a | 1541 | v9fs_dummy(s, pdu); |
9f107513 AL |
1542 | if (debug_9p_pdu) { |
1543 | pprint_pdu(pdu); | |
1544 | } | |
1545 | } | |
1546 | ||
1547 | static void v9fs_remove(V9fsState *s, V9fsPDU *pdu) | |
1548 | { | |
1549 | if (debug_9p_pdu) { | |
1550 | pprint_pdu(pdu); | |
1551 | } | |
1552 | } | |
1553 | ||
1554 | static void v9fs_wstat(V9fsState *s, V9fsPDU *pdu) | |
1555 | { | |
1556 | if (debug_9p_pdu) { | |
1557 | pprint_pdu(pdu); | |
1558 | } | |
1559 | } | |
1560 | ||
1561 | typedef void (pdu_handler_t)(V9fsState *s, V9fsPDU *pdu); | |
1562 | ||
1563 | static pdu_handler_t *pdu_handlers[] = { | |
1564 | [P9_TVERSION] = v9fs_version, | |
1565 | [P9_TATTACH] = v9fs_attach, | |
1566 | [P9_TSTAT] = v9fs_stat, | |
1567 | [P9_TWALK] = v9fs_walk, | |
1568 | [P9_TCLUNK] = v9fs_clunk, | |
1569 | [P9_TOPEN] = v9fs_open, | |
1570 | [P9_TREAD] = v9fs_read, | |
1571 | #if 0 | |
1572 | [P9_TAUTH] = v9fs_auth, | |
1573 | #endif | |
1574 | [P9_TFLUSH] = v9fs_flush, | |
1575 | [P9_TCREATE] = v9fs_create, | |
1576 | [P9_TWRITE] = v9fs_write, | |
1577 | [P9_TWSTAT] = v9fs_wstat, | |
1578 | [P9_TREMOVE] = v9fs_remove, | |
1579 | }; | |
1580 | ||
1581 | static void submit_pdu(V9fsState *s, V9fsPDU *pdu) | |
1582 | { | |
1583 | pdu_handler_t *handler; | |
1584 | ||
1585 | if (debug_9p_pdu) { | |
1586 | pprint_pdu(pdu); | |
1587 | } | |
1588 | ||
1589 | BUG_ON(pdu->id >= ARRAY_SIZE(pdu_handlers)); | |
1590 | ||
1591 | handler = pdu_handlers[pdu->id]; | |
1592 | BUG_ON(handler == NULL); | |
1593 | ||
1594 | handler(s, pdu); | |
1595 | } | |
1596 | ||
1597 | static void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq) | |
1598 | { | |
1599 | V9fsState *s = (V9fsState *)vdev; | |
1600 | V9fsPDU *pdu; | |
1601 | ssize_t len; | |
1602 | ||
1603 | while ((pdu = alloc_pdu(s)) && | |
1604 | (len = virtqueue_pop(vq, &pdu->elem)) != 0) { | |
1605 | uint8_t *ptr; | |
1606 | ||
1607 | BUG_ON(pdu->elem.out_num == 0 || pdu->elem.in_num == 0); | |
1608 | BUG_ON(pdu->elem.out_sg[0].iov_len < 7); | |
1609 | ||
1610 | ptr = pdu->elem.out_sg[0].iov_base; | |
1611 | ||
1612 | memcpy(&pdu->size, ptr, 4); | |
1613 | pdu->id = ptr[4]; | |
1614 | memcpy(&pdu->tag, ptr + 5, 2); | |
1615 | ||
1616 | submit_pdu(s, pdu); | |
1617 | } | |
1618 | ||
1619 | free_pdu(s, pdu); | |
1620 | } | |
1621 | ||
1622 | static uint32_t virtio_9p_get_features(VirtIODevice *vdev, uint32_t features) | |
1623 | { | |
1624 | features |= 1 << VIRTIO_9P_MOUNT_TAG; | |
1625 | return features; | |
1626 | } | |
1627 | ||
1628 | static V9fsState *to_virtio_9p(VirtIODevice *vdev) | |
1629 | { | |
1630 | return (V9fsState *)vdev; | |
1631 | } | |
1632 | ||
1633 | static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config) | |
1634 | { | |
1635 | struct virtio_9p_config *cfg; | |
1636 | V9fsState *s = to_virtio_9p(vdev); | |
1637 | ||
1638 | cfg = qemu_mallocz(sizeof(struct virtio_9p_config) + | |
1639 | s->tag_len); | |
1640 | stw_raw(&cfg->tag_len, s->tag_len); | |
1641 | memcpy(cfg->tag, s->tag, s->tag_len); | |
1642 | memcpy(config, cfg, s->config_size); | |
1643 | qemu_free(cfg); | |
1644 | } | |
1645 | ||
1646 | VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf) | |
1647 | { | |
1648 | V9fsState *s; | |
1649 | int i, len; | |
1650 | struct stat stat; | |
1651 | FsTypeEntry *fse; | |
1652 | ||
1653 | ||
1654 | s = (V9fsState *)virtio_common_init("virtio-9p", | |
1655 | VIRTIO_ID_9P, | |
1656 | sizeof(struct virtio_9p_config)+ | |
1657 | MAX_TAG_LEN, | |
1658 | sizeof(V9fsState)); | |
1659 | ||
1660 | /* initialize pdu allocator */ | |
1661 | QLIST_INIT(&s->free_list); | |
1662 | for (i = 0; i < (MAX_REQ - 1); i++) { | |
1663 | QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next); | |
1664 | } | |
1665 | ||
1666 | s->vq = virtio_add_queue(&s->vdev, MAX_REQ, handle_9p_output); | |
1667 | ||
1668 | fse = get_fsdev_fsentry(conf->fsdev_id); | |
1669 | ||
1670 | if (!fse) { | |
1671 | /* We don't have a fsdev identified by fsdev_id */ | |
1672 | fprintf(stderr, "Virtio-9p device couldn't find fsdev " | |
1673 | "with the id %s\n", conf->fsdev_id); | |
1674 | exit(1); | |
1675 | } | |
1676 | ||
1677 | if (!fse->path || !conf->tag) { | |
1678 | /* we haven't specified a mount_tag or the path */ | |
1679 | fprintf(stderr, "fsdev with id %s needs path " | |
1680 | "and Virtio-9p device needs mount_tag arguments\n", | |
1681 | conf->fsdev_id); | |
1682 | exit(1); | |
1683 | } | |
1684 | ||
1685 | if (lstat(fse->path, &stat)) { | |
1686 | fprintf(stderr, "share path %s does not exist\n", fse->path); | |
1687 | exit(1); | |
1688 | } else if (!S_ISDIR(stat.st_mode)) { | |
1689 | fprintf(stderr, "share path %s is not a directory \n", fse->path); | |
1690 | exit(1); | |
1691 | } | |
1692 | ||
1693 | s->ctx.fs_root = qemu_strdup(fse->path); | |
1694 | len = strlen(conf->tag); | |
1695 | if (len > MAX_TAG_LEN) { | |
1696 | len = MAX_TAG_LEN; | |
1697 | } | |
1698 | /* s->tag is non-NULL terminated string */ | |
1699 | s->tag = qemu_malloc(len); | |
1700 | memcpy(s->tag, conf->tag, len); | |
1701 | s->tag_len = len; | |
1702 | s->ctx.uid = -1; | |
1703 | ||
1704 | s->ops = fse->ops; | |
1705 | s->vdev.get_features = virtio_9p_get_features; | |
1706 | s->config_size = sizeof(struct virtio_9p_config) + | |
1707 | s->tag_len; | |
1708 | s->vdev.get_config = virtio_9p_get_config; | |
1709 | ||
1710 | return &s->vdev; | |
1711 | } |