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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 | ||
a03f7874 AL |
59 | static void v9fs_string_init(V9fsString *str) |
60 | { | |
61 | str->data = NULL; | |
62 | str->size = 0; | |
63 | } | |
64 | ||
65 | static void v9fs_string_free(V9fsString *str) | |
66 | { | |
67 | qemu_free(str->data); | |
68 | str->data = NULL; | |
69 | str->size = 0; | |
70 | } | |
71 | ||
72 | static void v9fs_string_null(V9fsString *str) | |
73 | { | |
74 | v9fs_string_free(str); | |
75 | } | |
76 | ||
77 | static int number_to_string(void *arg, char type) | |
78 | { | |
79 | unsigned int ret = 0; | |
80 | ||
81 | switch (type) { | |
82 | case 'u': { | |
83 | unsigned int num = *(unsigned int *)arg; | |
84 | ||
85 | do { | |
86 | ret++; | |
87 | num = num/10; | |
88 | } while (num); | |
89 | break; | |
90 | } | |
91 | default: | |
92 | printf("Number_to_string: Unknown number format\n"); | |
93 | return -1; | |
94 | } | |
95 | ||
96 | return ret; | |
97 | } | |
98 | ||
99 | static int v9fs_string_alloc_printf(char **strp, const char *fmt, va_list ap) | |
100 | { | |
101 | va_list ap2; | |
102 | char *iter = (char *)fmt; | |
103 | int len = 0; | |
104 | int nr_args = 0; | |
105 | char *arg_char_ptr; | |
106 | unsigned int arg_uint; | |
107 | ||
108 | /* Find the number of %'s that denotes an argument */ | |
109 | for (iter = strstr(iter, "%"); iter; iter = strstr(iter, "%")) { | |
110 | nr_args++; | |
111 | iter++; | |
112 | } | |
113 | ||
114 | len = strlen(fmt) - 2*nr_args; | |
115 | ||
116 | if (!nr_args) { | |
117 | goto alloc_print; | |
118 | } | |
119 | ||
120 | va_copy(ap2, ap); | |
121 | ||
122 | iter = (char *)fmt; | |
123 | ||
124 | /* Now parse the format string */ | |
125 | for (iter = strstr(iter, "%"); iter; iter = strstr(iter, "%")) { | |
126 | iter++; | |
127 | switch (*iter) { | |
128 | case 'u': | |
129 | arg_uint = va_arg(ap2, unsigned int); | |
130 | len += number_to_string((void *)&arg_uint, 'u'); | |
131 | break; | |
132 | case 's': | |
133 | arg_char_ptr = va_arg(ap2, char *); | |
134 | len += strlen(arg_char_ptr); | |
135 | break; | |
136 | case 'c': | |
137 | len += 1; | |
138 | break; | |
139 | default: | |
140 | fprintf(stderr, | |
141 | "v9fs_string_alloc_printf:Incorrect format %c", *iter); | |
142 | return -1; | |
143 | } | |
144 | iter++; | |
145 | } | |
146 | ||
147 | alloc_print: | |
148 | *strp = qemu_malloc((len + 1) * sizeof(**strp)); | |
149 | ||
150 | return vsprintf(*strp, fmt, ap); | |
151 | } | |
152 | ||
153 | static void v9fs_string_sprintf(V9fsString *str, const char *fmt, ...) | |
154 | { | |
155 | va_list ap; | |
156 | int err; | |
157 | ||
158 | v9fs_string_free(str); | |
159 | ||
160 | va_start(ap, fmt); | |
161 | err = v9fs_string_alloc_printf(&str->data, fmt, ap); | |
162 | BUG_ON(err == -1); | |
163 | va_end(ap); | |
164 | ||
165 | str->size = err; | |
166 | } | |
167 | ||
168 | static void v9fs_string_copy(V9fsString *lhs, V9fsString *rhs) | |
169 | { | |
170 | v9fs_string_free(lhs); | |
171 | v9fs_string_sprintf(lhs, "%s", rhs->data); | |
172 | } | |
173 | ||
174 | static size_t v9fs_string_size(V9fsString *str) | |
175 | { | |
176 | return str->size; | |
177 | } | |
178 | ||
286d5652 AL |
179 | static V9fsFidState *lookup_fid(V9fsState *s, int32_t fid) |
180 | { | |
181 | V9fsFidState *f; | |
182 | ||
183 | for (f = s->fid_list; f; f = f->next) { | |
184 | if (f->fid == fid) { | |
185 | v9fs_do_setuid(s, f->uid); | |
186 | return f; | |
187 | } | |
188 | } | |
189 | ||
190 | return NULL; | |
191 | } | |
192 | ||
193 | static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid) | |
194 | { | |
195 | V9fsFidState *f; | |
196 | ||
197 | f = lookup_fid(s, fid); | |
198 | if (f) { | |
199 | return NULL; | |
200 | } | |
201 | ||
202 | f = qemu_mallocz(sizeof(V9fsFidState)); | |
203 | ||
204 | f->fid = fid; | |
205 | f->fd = -1; | |
206 | f->dir = NULL; | |
207 | ||
208 | f->next = s->fid_list; | |
209 | s->fid_list = f; | |
210 | ||
211 | return f; | |
212 | } | |
213 | ||
214 | static int free_fid(V9fsState *s, int32_t fid) | |
215 | { | |
216 | V9fsFidState **fidpp, *fidp; | |
217 | ||
218 | for (fidpp = &s->fid_list; *fidpp; fidpp = &(*fidpp)->next) { | |
219 | if ((*fidpp)->fid == fid) { | |
220 | break; | |
221 | } | |
222 | } | |
223 | ||
224 | if (*fidpp == NULL) { | |
225 | return -ENOENT; | |
226 | } | |
227 | ||
228 | fidp = *fidpp; | |
229 | *fidpp = fidp->next; | |
230 | ||
231 | if (fidp->fd != -1) { | |
232 | v9fs_do_close(s, fidp->fd); | |
233 | } | |
234 | if (fidp->dir) { | |
235 | v9fs_do_closedir(s, fidp->dir); | |
236 | } | |
237 | v9fs_string_free(&fidp->path); | |
238 | qemu_free(fidp); | |
239 | ||
240 | return 0; | |
241 | } | |
242 | ||
243 | #define P9_QID_TYPE_DIR 0x80 | |
244 | #define P9_QID_TYPE_SYMLINK 0x02 | |
245 | ||
246 | #define P9_STAT_MODE_DIR 0x80000000 | |
247 | #define P9_STAT_MODE_APPEND 0x40000000 | |
248 | #define P9_STAT_MODE_EXCL 0x20000000 | |
249 | #define P9_STAT_MODE_MOUNT 0x10000000 | |
250 | #define P9_STAT_MODE_AUTH 0x08000000 | |
251 | #define P9_STAT_MODE_TMP 0x04000000 | |
252 | #define P9_STAT_MODE_SYMLINK 0x02000000 | |
253 | #define P9_STAT_MODE_LINK 0x01000000 | |
254 | #define P9_STAT_MODE_DEVICE 0x00800000 | |
255 | #define P9_STAT_MODE_NAMED_PIPE 0x00200000 | |
256 | #define P9_STAT_MODE_SOCKET 0x00100000 | |
257 | #define P9_STAT_MODE_SETUID 0x00080000 | |
258 | #define P9_STAT_MODE_SETGID 0x00040000 | |
259 | #define P9_STAT_MODE_SETVTX 0x00010000 | |
260 | ||
261 | #define P9_STAT_MODE_TYPE_BITS (P9_STAT_MODE_DIR | \ | |
262 | P9_STAT_MODE_SYMLINK | \ | |
263 | P9_STAT_MODE_LINK | \ | |
264 | P9_STAT_MODE_DEVICE | \ | |
265 | P9_STAT_MODE_NAMED_PIPE | \ | |
266 | P9_STAT_MODE_SOCKET) | |
267 | ||
268 | /* This is the algorithm from ufs in spfs */ | |
269 | static void stat_to_qid(const struct stat *stbuf, V9fsQID *qidp) | |
270 | { | |
271 | size_t size; | |
272 | ||
273 | size = MIN(sizeof(stbuf->st_ino), sizeof(qidp->path)); | |
274 | memcpy(&qidp->path, &stbuf->st_ino, size); | |
275 | qidp->version = stbuf->st_mtime ^ (stbuf->st_size << 8); | |
276 | qidp->type = 0; | |
277 | if (S_ISDIR(stbuf->st_mode)) { | |
278 | qidp->type |= P9_QID_TYPE_DIR; | |
279 | } | |
280 | if (S_ISLNK(stbuf->st_mode)) { | |
281 | qidp->type |= P9_QID_TYPE_SYMLINK; | |
282 | } | |
283 | } | |
284 | ||
285 | static int fid_to_qid(V9fsState *s, V9fsFidState *fidp, V9fsQID *qidp) | |
286 | { | |
287 | struct stat stbuf; | |
288 | int err; | |
289 | ||
290 | err = v9fs_do_lstat(s, &fidp->path, &stbuf); | |
291 | if (err) { | |
292 | return err; | |
293 | } | |
294 | ||
295 | stat_to_qid(&stbuf, qidp); | |
296 | return 0; | |
297 | } | |
298 | ||
9f107513 AL |
299 | static V9fsPDU *alloc_pdu(V9fsState *s) |
300 | { | |
301 | V9fsPDU *pdu = NULL; | |
302 | ||
303 | if (!QLIST_EMPTY(&s->free_list)) { | |
304 | pdu = QLIST_FIRST(&s->free_list); | |
305 | QLIST_REMOVE(pdu, next); | |
306 | } | |
307 | return pdu; | |
308 | } | |
309 | ||
310 | static void free_pdu(V9fsState *s, V9fsPDU *pdu) | |
311 | { | |
312 | if (pdu) { | |
313 | QLIST_INSERT_HEAD(&s->free_list, pdu, next); | |
314 | } | |
315 | } | |
316 | ||
317 | size_t pdu_packunpack(void *addr, struct iovec *sg, int sg_count, | |
318 | size_t offset, size_t size, int pack) | |
319 | { | |
320 | int i = 0; | |
321 | size_t copied = 0; | |
322 | ||
323 | for (i = 0; size && i < sg_count; i++) { | |
324 | size_t len; | |
325 | if (offset >= sg[i].iov_len) { | |
326 | /* skip this sg */ | |
327 | offset -= sg[i].iov_len; | |
328 | continue; | |
329 | } else { | |
330 | len = MIN(sg[i].iov_len - offset, size); | |
331 | if (pack) { | |
332 | memcpy(sg[i].iov_base + offset, addr, len); | |
333 | } else { | |
334 | memcpy(addr, sg[i].iov_base + offset, len); | |
335 | } | |
336 | size -= len; | |
337 | copied += len; | |
338 | addr += len; | |
339 | if (size) { | |
340 | offset = 0; | |
341 | continue; | |
342 | } | |
343 | } | |
344 | } | |
345 | ||
346 | return copied; | |
347 | } | |
348 | ||
405a549a AL |
349 | static size_t pdu_unpack(void *dst, V9fsPDU *pdu, size_t offset, size_t size) |
350 | { | |
351 | return pdu_packunpack(dst, pdu->elem.out_sg, pdu->elem.out_num, | |
352 | offset, size, 0); | |
353 | } | |
354 | ||
355 | static size_t pdu_pack(V9fsPDU *pdu, size_t offset, const void *src, | |
356 | size_t size) | |
357 | { | |
358 | return pdu_packunpack((void *)src, pdu->elem.in_sg, pdu->elem.in_num, | |
359 | offset, size, 1); | |
360 | } | |
361 | ||
362 | static int pdu_copy_sg(V9fsPDU *pdu, size_t offset, int rx, struct iovec *sg) | |
363 | { | |
364 | size_t pos = 0; | |
365 | int i, j; | |
366 | struct iovec *src_sg; | |
367 | unsigned int num; | |
368 | ||
369 | if (rx) { | |
370 | src_sg = pdu->elem.in_sg; | |
371 | num = pdu->elem.in_num; | |
372 | } else { | |
373 | src_sg = pdu->elem.out_sg; | |
374 | num = pdu->elem.out_num; | |
375 | } | |
376 | ||
377 | j = 0; | |
378 | for (i = 0; i < num; i++) { | |
379 | if (offset <= pos) { | |
380 | sg[j].iov_base = src_sg[i].iov_base; | |
381 | sg[j].iov_len = src_sg[i].iov_len; | |
382 | j++; | |
383 | } else if (offset < (src_sg[i].iov_len + pos)) { | |
384 | sg[j].iov_base = src_sg[i].iov_base; | |
385 | sg[j].iov_len = src_sg[i].iov_len; | |
386 | sg[j].iov_base += (offset - pos); | |
387 | sg[j].iov_len -= (offset - pos); | |
388 | j++; | |
389 | } | |
390 | pos += src_sg[i].iov_len; | |
391 | } | |
392 | ||
393 | return j; | |
394 | } | |
395 | ||
396 | static size_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) | |
397 | { | |
398 | size_t old_offset = offset; | |
399 | va_list ap; | |
400 | int i; | |
401 | ||
402 | va_start(ap, fmt); | |
403 | for (i = 0; fmt[i]; i++) { | |
404 | switch (fmt[i]) { | |
405 | case 'b': { | |
406 | uint8_t *valp = va_arg(ap, uint8_t *); | |
407 | offset += pdu_unpack(valp, pdu, offset, sizeof(*valp)); | |
408 | break; | |
409 | } | |
410 | case 'w': { | |
411 | uint16_t val, *valp; | |
412 | valp = va_arg(ap, uint16_t *); | |
413 | val = le16_to_cpupu(valp); | |
414 | offset += pdu_unpack(&val, pdu, offset, sizeof(val)); | |
415 | *valp = val; | |
416 | break; | |
417 | } | |
418 | case 'd': { | |
419 | uint32_t val, *valp; | |
420 | valp = va_arg(ap, uint32_t *); | |
421 | val = le32_to_cpupu(valp); | |
422 | offset += pdu_unpack(&val, pdu, offset, sizeof(val)); | |
423 | *valp = val; | |
424 | break; | |
425 | } | |
426 | case 'q': { | |
427 | uint64_t val, *valp; | |
428 | valp = va_arg(ap, uint64_t *); | |
429 | val = le64_to_cpup(valp); | |
430 | offset += pdu_unpack(&val, pdu, offset, sizeof(val)); | |
431 | *valp = val; | |
432 | break; | |
433 | } | |
434 | case 'v': { | |
435 | struct iovec *iov = va_arg(ap, struct iovec *); | |
436 | int *iovcnt = va_arg(ap, int *); | |
437 | *iovcnt = pdu_copy_sg(pdu, offset, 0, iov); | |
438 | break; | |
439 | } | |
440 | case 's': { | |
441 | V9fsString *str = va_arg(ap, V9fsString *); | |
442 | offset += pdu_unmarshal(pdu, offset, "w", &str->size); | |
443 | /* FIXME: sanity check str->size */ | |
444 | str->data = qemu_malloc(str->size + 1); | |
445 | offset += pdu_unpack(str->data, pdu, offset, str->size); | |
446 | str->data[str->size] = 0; | |
447 | break; | |
448 | } | |
449 | case 'Q': { | |
450 | V9fsQID *qidp = va_arg(ap, V9fsQID *); | |
451 | offset += pdu_unmarshal(pdu, offset, "bdq", | |
452 | &qidp->type, &qidp->version, &qidp->path); | |
453 | break; | |
454 | } | |
455 | case 'S': { | |
456 | V9fsStat *statp = va_arg(ap, V9fsStat *); | |
457 | offset += pdu_unmarshal(pdu, offset, "wwdQdddqsssssddd", | |
458 | &statp->size, &statp->type, &statp->dev, | |
459 | &statp->qid, &statp->mode, &statp->atime, | |
460 | &statp->mtime, &statp->length, | |
461 | &statp->name, &statp->uid, &statp->gid, | |
462 | &statp->muid, &statp->extension, | |
463 | &statp->n_uid, &statp->n_gid, | |
464 | &statp->n_muid); | |
465 | break; | |
466 | } | |
467 | default: | |
468 | break; | |
469 | } | |
470 | } | |
471 | ||
472 | va_end(ap); | |
473 | ||
474 | return offset - old_offset; | |
475 | } | |
476 | ||
477 | static size_t pdu_marshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...) | |
478 | { | |
479 | size_t old_offset = offset; | |
480 | va_list ap; | |
481 | int i; | |
482 | ||
483 | va_start(ap, fmt); | |
484 | for (i = 0; fmt[i]; i++) { | |
485 | switch (fmt[i]) { | |
486 | case 'b': { | |
487 | uint8_t val = va_arg(ap, int); | |
488 | offset += pdu_pack(pdu, offset, &val, sizeof(val)); | |
489 | break; | |
490 | } | |
491 | case 'w': { | |
492 | uint16_t val; | |
493 | cpu_to_le16w(&val, va_arg(ap, int)); | |
494 | offset += pdu_pack(pdu, offset, &val, sizeof(val)); | |
495 | break; | |
496 | } | |
497 | case 'd': { | |
498 | uint32_t val; | |
499 | cpu_to_le32w(&val, va_arg(ap, uint32_t)); | |
500 | offset += pdu_pack(pdu, offset, &val, sizeof(val)); | |
501 | break; | |
502 | } | |
503 | case 'q': { | |
504 | uint64_t val; | |
505 | cpu_to_le64w(&val, va_arg(ap, uint64_t)); | |
506 | offset += pdu_pack(pdu, offset, &val, sizeof(val)); | |
507 | break; | |
508 | } | |
509 | case 'v': { | |
510 | struct iovec *iov = va_arg(ap, struct iovec *); | |
511 | int *iovcnt = va_arg(ap, int *); | |
512 | *iovcnt = pdu_copy_sg(pdu, offset, 1, iov); | |
513 | break; | |
514 | } | |
515 | case 's': { | |
516 | V9fsString *str = va_arg(ap, V9fsString *); | |
517 | offset += pdu_marshal(pdu, offset, "w", str->size); | |
518 | offset += pdu_pack(pdu, offset, str->data, str->size); | |
519 | break; | |
520 | } | |
521 | case 'Q': { | |
522 | V9fsQID *qidp = va_arg(ap, V9fsQID *); | |
523 | offset += pdu_marshal(pdu, offset, "bdq", | |
524 | qidp->type, qidp->version, qidp->path); | |
525 | break; | |
526 | } | |
527 | case 'S': { | |
528 | V9fsStat *statp = va_arg(ap, V9fsStat *); | |
529 | offset += pdu_marshal(pdu, offset, "wwdQdddqsssssddd", | |
530 | statp->size, statp->type, statp->dev, | |
531 | &statp->qid, statp->mode, statp->atime, | |
532 | statp->mtime, statp->length, &statp->name, | |
533 | &statp->uid, &statp->gid, &statp->muid, | |
534 | &statp->extension, statp->n_uid, | |
535 | statp->n_gid, statp->n_muid); | |
536 | break; | |
537 | } | |
538 | default: | |
539 | break; | |
540 | } | |
541 | } | |
542 | va_end(ap); | |
543 | ||
544 | return offset - old_offset; | |
545 | } | |
546 | ||
547 | static void complete_pdu(V9fsState *s, V9fsPDU *pdu, ssize_t len) | |
548 | { | |
549 | int8_t id = pdu->id + 1; /* Response */ | |
550 | ||
551 | if (len < 0) { | |
552 | V9fsString str; | |
553 | int err = -len; | |
554 | ||
555 | str.data = strerror(err); | |
556 | str.size = strlen(str.data); | |
557 | ||
558 | len = 7; | |
559 | len += pdu_marshal(pdu, len, "s", &str); | |
560 | if (dotu) { | |
561 | len += pdu_marshal(pdu, len, "d", err); | |
562 | } | |
563 | ||
564 | id = P9_RERROR; | |
565 | } | |
566 | ||
567 | /* fill out the header */ | |
568 | pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag); | |
569 | ||
570 | /* keep these in sync */ | |
571 | pdu->size = len; | |
572 | pdu->id = id; | |
573 | ||
574 | /* push onto queue and notify */ | |
575 | virtqueue_push(s->vq, &pdu->elem, len); | |
576 | ||
577 | /* FIXME: we should batch these completions */ | |
578 | virtio_notify(&s->vdev, s->vq); | |
579 | ||
580 | free_pdu(s, pdu); | |
581 | } | |
582 | ||
bb9e3216 AL |
583 | static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension) |
584 | { | |
585 | mode_t ret; | |
586 | ||
587 | ret = mode & 0777; | |
588 | if (mode & P9_STAT_MODE_DIR) { | |
589 | ret |= S_IFDIR; | |
590 | } | |
591 | ||
592 | if (dotu) { | |
593 | if (mode & P9_STAT_MODE_SYMLINK) { | |
594 | ret |= S_IFLNK; | |
595 | } | |
596 | if (mode & P9_STAT_MODE_SOCKET) { | |
597 | ret |= S_IFSOCK; | |
598 | } | |
599 | if (mode & P9_STAT_MODE_NAMED_PIPE) { | |
600 | ret |= S_IFIFO; | |
601 | } | |
602 | if (mode & P9_STAT_MODE_DEVICE) { | |
603 | if (extension && extension->data[0] == 'c') { | |
604 | ret |= S_IFCHR; | |
605 | } else { | |
606 | ret |= S_IFBLK; | |
607 | } | |
608 | } | |
609 | } | |
610 | ||
611 | if (!(ret&~0777)) { | |
612 | ret |= S_IFREG; | |
613 | } | |
614 | ||
615 | if (mode & P9_STAT_MODE_SETUID) { | |
616 | ret |= S_ISUID; | |
617 | } | |
618 | if (mode & P9_STAT_MODE_SETGID) { | |
619 | ret |= S_ISGID; | |
620 | } | |
621 | if (mode & P9_STAT_MODE_SETVTX) { | |
622 | ret |= S_ISVTX; | |
623 | } | |
624 | ||
625 | return ret; | |
626 | } | |
627 | ||
628 | static int donttouch_stat(V9fsStat *stat) | |
629 | { | |
630 | if (stat->type == -1 && | |
631 | stat->dev == -1 && | |
632 | stat->qid.type == -1 && | |
633 | stat->qid.version == -1 && | |
634 | stat->qid.path == -1 && | |
635 | stat->mode == -1 && | |
636 | stat->atime == -1 && | |
637 | stat->mtime == -1 && | |
638 | stat->length == -1 && | |
639 | !stat->name.size && | |
640 | !stat->uid.size && | |
641 | !stat->gid.size && | |
642 | !stat->muid.size && | |
643 | stat->n_uid == -1 && | |
644 | stat->n_gid == -1 && | |
645 | stat->n_muid == -1) { | |
646 | return 1; | |
647 | } | |
648 | ||
649 | return 0; | |
650 | } | |
651 | ||
652 | static void v9fs_stat_free(V9fsStat *stat) | |
653 | { | |
654 | v9fs_string_free(&stat->name); | |
655 | v9fs_string_free(&stat->uid); | |
656 | v9fs_string_free(&stat->gid); | |
657 | v9fs_string_free(&stat->muid); | |
658 | v9fs_string_free(&stat->extension); | |
659 | } | |
660 | ||
661 | static uint32_t stat_to_v9mode(const struct stat *stbuf) | |
662 | { | |
663 | uint32_t mode; | |
664 | ||
665 | mode = stbuf->st_mode & 0777; | |
666 | if (S_ISDIR(stbuf->st_mode)) { | |
667 | mode |= P9_STAT_MODE_DIR; | |
668 | } | |
669 | ||
670 | if (dotu) { | |
671 | if (S_ISLNK(stbuf->st_mode)) { | |
672 | mode |= P9_STAT_MODE_SYMLINK; | |
673 | } | |
674 | ||
675 | if (S_ISSOCK(stbuf->st_mode)) { | |
676 | mode |= P9_STAT_MODE_SOCKET; | |
677 | } | |
678 | ||
679 | if (S_ISFIFO(stbuf->st_mode)) { | |
680 | mode |= P9_STAT_MODE_NAMED_PIPE; | |
681 | } | |
682 | ||
683 | if (S_ISBLK(stbuf->st_mode) || S_ISCHR(stbuf->st_mode)) { | |
684 | mode |= P9_STAT_MODE_DEVICE; | |
685 | } | |
686 | ||
687 | if (stbuf->st_mode & S_ISUID) { | |
688 | mode |= P9_STAT_MODE_SETUID; | |
689 | } | |
690 | ||
691 | if (stbuf->st_mode & S_ISGID) { | |
692 | mode |= P9_STAT_MODE_SETGID; | |
693 | } | |
694 | ||
695 | if (stbuf->st_mode & S_ISVTX) { | |
696 | mode |= P9_STAT_MODE_SETVTX; | |
697 | } | |
698 | } | |
699 | ||
700 | return mode; | |
701 | } | |
702 | ||
703 | static int stat_to_v9stat(V9fsState *s, V9fsString *name, | |
704 | const struct stat *stbuf, | |
705 | V9fsStat *v9stat) | |
706 | { | |
707 | int err; | |
708 | const char *str; | |
709 | ||
710 | memset(v9stat, 0, sizeof(*v9stat)); | |
711 | ||
712 | stat_to_qid(stbuf, &v9stat->qid); | |
713 | v9stat->mode = stat_to_v9mode(stbuf); | |
714 | v9stat->atime = stbuf->st_atime; | |
715 | v9stat->mtime = stbuf->st_mtime; | |
716 | v9stat->length = stbuf->st_size; | |
717 | ||
718 | v9fs_string_null(&v9stat->uid); | |
719 | v9fs_string_null(&v9stat->gid); | |
720 | v9fs_string_null(&v9stat->muid); | |
721 | ||
722 | if (dotu) { | |
723 | v9stat->n_uid = stbuf->st_uid; | |
724 | v9stat->n_gid = stbuf->st_gid; | |
725 | v9stat->n_muid = 0; | |
726 | ||
727 | v9fs_string_null(&v9stat->extension); | |
728 | ||
729 | if (v9stat->mode & P9_STAT_MODE_SYMLINK) { | |
730 | err = v9fs_do_readlink(s, name, &v9stat->extension); | |
731 | if (err == -1) { | |
732 | err = -errno; | |
733 | return err; | |
734 | } | |
735 | v9stat->extension.data[err] = 0; | |
736 | v9stat->extension.size = err; | |
737 | } else if (v9stat->mode & P9_STAT_MODE_DEVICE) { | |
738 | v9fs_string_sprintf(&v9stat->extension, "%c %u %u", | |
739 | S_ISCHR(stbuf->st_mode) ? 'c' : 'b', | |
740 | major(stbuf->st_rdev), minor(stbuf->st_rdev)); | |
741 | } else if (S_ISDIR(stbuf->st_mode) || S_ISREG(stbuf->st_mode)) { | |
742 | v9fs_string_sprintf(&v9stat->extension, "%s %u", | |
743 | "HARDLINKCOUNT", stbuf->st_nlink); | |
744 | } | |
745 | } | |
746 | ||
747 | str = strrchr(name->data, '/'); | |
748 | if (str) { | |
749 | str += 1; | |
750 | } else { | |
751 | str = name->data; | |
752 | } | |
753 | ||
754 | v9fs_string_sprintf(&v9stat->name, "%s", str); | |
755 | ||
756 | v9stat->size = 61 + | |
757 | v9fs_string_size(&v9stat->name) + | |
758 | v9fs_string_size(&v9stat->uid) + | |
759 | v9fs_string_size(&v9stat->gid) + | |
760 | v9fs_string_size(&v9stat->muid) + | |
761 | v9fs_string_size(&v9stat->extension); | |
762 | return 0; | |
763 | } | |
764 | ||
1f5a89bf AL |
765 | static struct iovec *adjust_sg(struct iovec *sg, int len, int *iovcnt) |
766 | { | |
767 | while (len && *iovcnt) { | |
768 | if (len < sg->iov_len) { | |
769 | sg->iov_len -= len; | |
770 | sg->iov_base += len; | |
771 | len = 0; | |
772 | } else { | |
773 | len -= sg->iov_len; | |
774 | sg++; | |
775 | *iovcnt -= 1; | |
776 | } | |
777 | } | |
778 | ||
779 | return sg; | |
780 | } | |
781 | ||
782 | static struct iovec *cap_sg(struct iovec *sg, int cap, int *cnt) | |
783 | { | |
784 | int i; | |
785 | int total = 0; | |
786 | ||
787 | for (i = 0; i < *cnt; i++) { | |
788 | if ((total + sg[i].iov_len) > cap) { | |
789 | sg[i].iov_len -= ((total + sg[i].iov_len) - cap); | |
790 | i++; | |
791 | break; | |
792 | } | |
793 | total += sg[i].iov_len; | |
794 | } | |
795 | ||
796 | *cnt = i; | |
797 | ||
798 | return sg; | |
799 | } | |
800 | ||
801 | static void print_sg(struct iovec *sg, int cnt) | |
802 | { | |
803 | int i; | |
804 | ||
805 | printf("sg[%d]: {", cnt); | |
806 | for (i = 0; i < cnt; i++) { | |
807 | if (i) { | |
808 | printf(", "); | |
809 | } | |
810 | printf("(%p, %zd)", sg[i].iov_base, sg[i].iov_len); | |
811 | } | |
812 | printf("}\n"); | |
813 | } | |
814 | ||
405a549a AL |
815 | static void v9fs_dummy(V9fsState *s, V9fsPDU *pdu) |
816 | { | |
817 | /* Note: The following have been added to prevent GCC from complaining | |
818 | * They will be removed in the subsequent patches */ | |
819 | (void)pdu_unmarshal; | |
820 | (void) complete_pdu; | |
a03f7874 AL |
821 | (void) v9fs_string_init; |
822 | (void) v9fs_string_free; | |
823 | (void) v9fs_string_null; | |
824 | (void) v9fs_string_sprintf; | |
825 | (void) v9fs_string_copy; | |
826 | (void) v9fs_string_size; | |
131dcb25 AL |
827 | (void) v9fs_do_lstat; |
828 | (void) v9fs_do_setuid; | |
829 | (void) v9fs_do_readlink; | |
830 | (void) v9fs_do_close; | |
831 | (void) v9fs_do_closedir; | |
286d5652 AL |
832 | (void) alloc_fid; |
833 | (void) free_fid; | |
834 | (void) fid_to_qid; | |
bb9e3216 AL |
835 | (void) v9mode_to_mode; |
836 | (void) donttouch_stat; | |
837 | (void) v9fs_stat_free; | |
838 | (void) stat_to_v9stat; | |
1f5a89bf AL |
839 | (void) adjust_sg; |
840 | (void) cap_sg; | |
841 | (void) print_sg; | |
405a549a | 842 | } |
131dcb25 | 843 | |
9f107513 AL |
844 | static void v9fs_version(V9fsState *s, V9fsPDU *pdu) |
845 | { | |
92c1ad03 AL |
846 | int32_t msize; |
847 | V9fsString version; | |
848 | size_t offset = 7; | |
849 | ||
850 | pdu_unmarshal(pdu, offset, "ds", &msize, &version); | |
851 | ||
852 | if (strcmp(version.data, "9P2000.u")) { | |
853 | v9fs_string_sprintf(&version, "unknown"); | |
9f107513 | 854 | } |
92c1ad03 AL |
855 | |
856 | offset += pdu_marshal(pdu, offset, "ds", msize, &version); | |
857 | complete_pdu(s, pdu, offset); | |
858 | ||
859 | v9fs_string_free(&version); | |
9f107513 AL |
860 | } |
861 | ||
862 | static void v9fs_attach(V9fsState *s, V9fsPDU *pdu) | |
863 | { | |
955efc47 AL |
864 | int32_t fid, afid, n_uname; |
865 | V9fsString uname, aname; | |
866 | V9fsFidState *fidp; | |
867 | V9fsQID qid; | |
868 | size_t offset = 7; | |
869 | ssize_t err; | |
870 | ||
871 | pdu_unmarshal(pdu, offset, "ddssd", &fid, &afid, &uname, &aname, &n_uname); | |
872 | ||
873 | fidp = alloc_fid(s, fid); | |
874 | if (fidp == NULL) { | |
875 | err = -EINVAL; | |
876 | goto out; | |
9f107513 | 877 | } |
955efc47 AL |
878 | |
879 | fidp->uid = n_uname; | |
880 | ||
881 | v9fs_string_sprintf(&fidp->path, "%s", "/"); | |
882 | err = fid_to_qid(s, fidp, &qid); | |
883 | if (err) { | |
884 | err = -EINVAL; | |
885 | free_fid(s, fid); | |
886 | goto out; | |
887 | } | |
888 | ||
889 | offset += pdu_marshal(pdu, offset, "Q", &qid); | |
890 | ||
891 | err = offset; | |
892 | out: | |
893 | complete_pdu(s, pdu, err); | |
894 | v9fs_string_free(&uname); | |
895 | v9fs_string_free(&aname); | |
9f107513 AL |
896 | } |
897 | ||
4da7d3fa AL |
898 | typedef struct V9fsStatState { |
899 | V9fsPDU *pdu; | |
900 | size_t offset; | |
901 | V9fsStat v9stat; | |
902 | V9fsFidState *fidp; | |
903 | struct stat stbuf; | |
904 | } V9fsStatState; | |
905 | ||
906 | static void v9fs_stat_post_lstat(V9fsState *s, V9fsStatState *vs, int err) | |
907 | { | |
908 | if (err == -1) { | |
909 | err = -errno; | |
910 | goto out; | |
911 | } | |
912 | ||
913 | err = stat_to_v9stat(s, &vs->fidp->path, &vs->stbuf, &vs->v9stat); | |
914 | if (err) { | |
915 | goto out; | |
916 | } | |
917 | vs->offset += pdu_marshal(vs->pdu, vs->offset, "wS", 0, &vs->v9stat); | |
918 | err = vs->offset; | |
919 | ||
920 | out: | |
921 | complete_pdu(s, vs->pdu, err); | |
922 | v9fs_stat_free(&vs->v9stat); | |
923 | qemu_free(vs); | |
924 | } | |
925 | ||
9f107513 AL |
926 | static void v9fs_stat(V9fsState *s, V9fsPDU *pdu) |
927 | { | |
4da7d3fa AL |
928 | int32_t fid; |
929 | V9fsStatState *vs; | |
930 | ssize_t err = 0; | |
931 | ||
932 | vs = qemu_malloc(sizeof(*vs)); | |
933 | vs->pdu = pdu; | |
934 | vs->offset = 7; | |
935 | ||
936 | memset(&vs->v9stat, 0, sizeof(vs->v9stat)); | |
937 | ||
938 | pdu_unmarshal(vs->pdu, vs->offset, "d", &fid); | |
939 | ||
940 | vs->fidp = lookup_fid(s, fid); | |
941 | if (vs->fidp == NULL) { | |
942 | err = -ENOENT; | |
943 | goto out; | |
9f107513 | 944 | } |
4da7d3fa AL |
945 | |
946 | err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf); | |
947 | v9fs_stat_post_lstat(s, vs, err); | |
948 | return; | |
949 | ||
950 | out: | |
951 | complete_pdu(s, vs->pdu, err); | |
952 | v9fs_stat_free(&vs->v9stat); | |
953 | qemu_free(vs); | |
9f107513 AL |
954 | } |
955 | ||
ff5e54c9 AL |
956 | typedef struct V9fsWalkState { |
957 | V9fsPDU *pdu; | |
958 | size_t offset; | |
959 | int16_t nwnames; | |
960 | int name_idx; | |
961 | V9fsQID *qids; | |
962 | V9fsFidState *fidp; | |
963 | V9fsFidState *newfidp; | |
964 | V9fsString path; | |
965 | V9fsString *wnames; | |
966 | struct stat stbuf; | |
967 | } V9fsWalkState; | |
968 | ||
969 | static void v9fs_walk_complete(V9fsState *s, V9fsWalkState *vs, int err) | |
970 | { | |
971 | complete_pdu(s, vs->pdu, err); | |
972 | ||
973 | if (vs->nwnames) { | |
974 | for (vs->name_idx = 0; vs->name_idx < vs->nwnames; vs->name_idx++) { | |
975 | v9fs_string_free(&vs->wnames[vs->name_idx]); | |
976 | } | |
977 | ||
978 | qemu_free(vs->wnames); | |
979 | qemu_free(vs->qids); | |
980 | } | |
981 | } | |
982 | ||
983 | static void v9fs_walk_marshal(V9fsWalkState *vs) | |
984 | { | |
985 | int i; | |
986 | vs->offset = 7; | |
987 | vs->offset += pdu_marshal(vs->pdu, vs->offset, "w", vs->nwnames); | |
988 | ||
989 | for (i = 0; i < vs->nwnames; i++) { | |
990 | vs->offset += pdu_marshal(vs->pdu, vs->offset, "Q", &vs->qids[i]); | |
991 | } | |
992 | } | |
993 | ||
994 | static void v9fs_walk_post_newfid_lstat(V9fsState *s, V9fsWalkState *vs, | |
995 | int err) | |
996 | { | |
997 | if (err == -1) { | |
998 | free_fid(s, vs->newfidp->fid); | |
999 | v9fs_string_free(&vs->path); | |
1000 | err = -ENOENT; | |
1001 | goto out; | |
1002 | } | |
1003 | ||
1004 | stat_to_qid(&vs->stbuf, &vs->qids[vs->name_idx]); | |
1005 | ||
1006 | vs->name_idx++; | |
1007 | if (vs->name_idx < vs->nwnames) { | |
1008 | v9fs_string_sprintf(&vs->path, "%s/%s", vs->newfidp->path.data, | |
1009 | vs->wnames[vs->name_idx].data); | |
1010 | v9fs_string_copy(&vs->newfidp->path, &vs->path); | |
1011 | ||
1012 | err = v9fs_do_lstat(s, &vs->newfidp->path, &vs->stbuf); | |
1013 | v9fs_walk_post_newfid_lstat(s, vs, err); | |
1014 | return; | |
1015 | } | |
1016 | ||
1017 | v9fs_string_free(&vs->path); | |
1018 | v9fs_walk_marshal(vs); | |
1019 | err = vs->offset; | |
1020 | out: | |
1021 | v9fs_walk_complete(s, vs, err); | |
1022 | } | |
1023 | ||
1024 | static void v9fs_walk_post_oldfid_lstat(V9fsState *s, V9fsWalkState *vs, | |
1025 | int err) | |
1026 | { | |
1027 | if (err == -1) { | |
1028 | v9fs_string_free(&vs->path); | |
1029 | err = -ENOENT; | |
1030 | goto out; | |
1031 | } | |
1032 | ||
1033 | stat_to_qid(&vs->stbuf, &vs->qids[vs->name_idx]); | |
1034 | vs->name_idx++; | |
1035 | if (vs->name_idx < vs->nwnames) { | |
1036 | ||
1037 | v9fs_string_sprintf(&vs->path, "%s/%s", | |
1038 | vs->fidp->path.data, vs->wnames[vs->name_idx].data); | |
1039 | v9fs_string_copy(&vs->fidp->path, &vs->path); | |
1040 | ||
1041 | err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf); | |
1042 | v9fs_walk_post_oldfid_lstat(s, vs, err); | |
1043 | return; | |
1044 | } | |
1045 | ||
1046 | v9fs_string_free(&vs->path); | |
1047 | v9fs_walk_marshal(vs); | |
1048 | err = vs->offset; | |
1049 | out: | |
1050 | v9fs_walk_complete(s, vs, err); | |
1051 | } | |
1052 | ||
9f107513 AL |
1053 | static void v9fs_walk(V9fsState *s, V9fsPDU *pdu) |
1054 | { | |
ff5e54c9 AL |
1055 | int32_t fid, newfid; |
1056 | V9fsWalkState *vs; | |
1057 | int err = 0; | |
1058 | int i; | |
1059 | ||
1060 | vs = qemu_malloc(sizeof(*vs)); | |
1061 | vs->pdu = pdu; | |
1062 | vs->wnames = NULL; | |
1063 | vs->qids = NULL; | |
1064 | vs->offset = 7; | |
1065 | ||
1066 | vs->offset += pdu_unmarshal(vs->pdu, vs->offset, "ddw", &fid, | |
1067 | &newfid, &vs->nwnames); | |
1068 | ||
1069 | if (vs->nwnames) { | |
1070 | vs->wnames = qemu_mallocz(sizeof(vs->wnames[0]) * vs->nwnames); | |
1071 | ||
1072 | vs->qids = qemu_mallocz(sizeof(vs->qids[0]) * vs->nwnames); | |
1073 | ||
1074 | for (i = 0; i < vs->nwnames; i++) { | |
1075 | vs->offset += pdu_unmarshal(vs->pdu, vs->offset, "s", | |
1076 | &vs->wnames[i]); | |
1077 | } | |
1078 | } | |
1079 | ||
1080 | vs->fidp = lookup_fid(s, fid); | |
1081 | if (vs->fidp == NULL) { | |
1082 | err = -ENOENT; | |
1083 | goto out; | |
1084 | } | |
1085 | ||
1086 | /* FIXME: is this really valid? */ | |
1087 | if (fid == newfid) { | |
1088 | ||
1089 | BUG_ON(vs->fidp->fd != -1); | |
1090 | BUG_ON(vs->fidp->dir); | |
1091 | v9fs_string_init(&vs->path); | |
1092 | vs->name_idx = 0; | |
1093 | ||
1094 | if (vs->name_idx < vs->nwnames) { | |
1095 | v9fs_string_sprintf(&vs->path, "%s/%s", | |
1096 | vs->fidp->path.data, vs->wnames[vs->name_idx].data); | |
1097 | v9fs_string_copy(&vs->fidp->path, &vs->path); | |
1098 | ||
1099 | err = v9fs_do_lstat(s, &vs->fidp->path, &vs->stbuf); | |
1100 | v9fs_walk_post_oldfid_lstat(s, vs, err); | |
1101 | return; | |
1102 | } | |
1103 | } else { | |
1104 | vs->newfidp = alloc_fid(s, newfid); | |
1105 | if (vs->newfidp == NULL) { | |
1106 | err = -EINVAL; | |
1107 | goto out; | |
1108 | } | |
1109 | ||
1110 | vs->newfidp->uid = vs->fidp->uid; | |
1111 | v9fs_string_init(&vs->path); | |
1112 | vs->name_idx = 0; | |
1113 | v9fs_string_copy(&vs->newfidp->path, &vs->fidp->path); | |
1114 | ||
1115 | if (vs->name_idx < vs->nwnames) { | |
1116 | v9fs_string_sprintf(&vs->path, "%s/%s", vs->newfidp->path.data, | |
1117 | vs->wnames[vs->name_idx].data); | |
1118 | v9fs_string_copy(&vs->newfidp->path, &vs->path); | |
1119 | ||
1120 | err = v9fs_do_lstat(s, &vs->newfidp->path, &vs->stbuf); | |
1121 | v9fs_walk_post_newfid_lstat(s, vs, err); | |
1122 | return; | |
1123 | } | |
9f107513 | 1124 | } |
ff5e54c9 AL |
1125 | |
1126 | v9fs_walk_marshal(vs); | |
1127 | err = vs->offset; | |
1128 | out: | |
1129 | v9fs_walk_complete(s, vs, err); | |
9f107513 AL |
1130 | } |
1131 | ||
1132 | static void v9fs_clunk(V9fsState *s, V9fsPDU *pdu) | |
1133 | { | |
1134 | if (debug_9p_pdu) { | |
1135 | pprint_pdu(pdu); | |
1136 | } | |
1137 | } | |
1138 | ||
1139 | static void v9fs_open(V9fsState *s, V9fsPDU *pdu) | |
1140 | { if (debug_9p_pdu) { | |
1141 | pprint_pdu(pdu); | |
1142 | } | |
1143 | } | |
1144 | ||
1145 | static void v9fs_read(V9fsState *s, V9fsPDU *pdu) | |
1146 | { | |
1147 | if (debug_9p_pdu) { | |
1148 | pprint_pdu(pdu); | |
1149 | } | |
1150 | } | |
1151 | ||
1152 | static void v9fs_write(V9fsState *s, V9fsPDU *pdu) | |
1153 | { | |
1154 | if (debug_9p_pdu) { | |
1155 | pprint_pdu(pdu); | |
1156 | } | |
1157 | } | |
1158 | ||
1159 | static void v9fs_create(V9fsState *s, V9fsPDU *pdu) | |
1160 | { | |
1161 | if (debug_9p_pdu) { | |
1162 | pprint_pdu(pdu); | |
1163 | } | |
1164 | } | |
1165 | ||
1166 | static void v9fs_flush(V9fsState *s, V9fsPDU *pdu) | |
1167 | { | |
405a549a | 1168 | v9fs_dummy(s, pdu); |
9f107513 AL |
1169 | if (debug_9p_pdu) { |
1170 | pprint_pdu(pdu); | |
1171 | } | |
1172 | } | |
1173 | ||
1174 | static void v9fs_remove(V9fsState *s, V9fsPDU *pdu) | |
1175 | { | |
1176 | if (debug_9p_pdu) { | |
1177 | pprint_pdu(pdu); | |
1178 | } | |
1179 | } | |
1180 | ||
1181 | static void v9fs_wstat(V9fsState *s, V9fsPDU *pdu) | |
1182 | { | |
1183 | if (debug_9p_pdu) { | |
1184 | pprint_pdu(pdu); | |
1185 | } | |
1186 | } | |
1187 | ||
1188 | typedef void (pdu_handler_t)(V9fsState *s, V9fsPDU *pdu); | |
1189 | ||
1190 | static pdu_handler_t *pdu_handlers[] = { | |
1191 | [P9_TVERSION] = v9fs_version, | |
1192 | [P9_TATTACH] = v9fs_attach, | |
1193 | [P9_TSTAT] = v9fs_stat, | |
1194 | [P9_TWALK] = v9fs_walk, | |
1195 | [P9_TCLUNK] = v9fs_clunk, | |
1196 | [P9_TOPEN] = v9fs_open, | |
1197 | [P9_TREAD] = v9fs_read, | |
1198 | #if 0 | |
1199 | [P9_TAUTH] = v9fs_auth, | |
1200 | #endif | |
1201 | [P9_TFLUSH] = v9fs_flush, | |
1202 | [P9_TCREATE] = v9fs_create, | |
1203 | [P9_TWRITE] = v9fs_write, | |
1204 | [P9_TWSTAT] = v9fs_wstat, | |
1205 | [P9_TREMOVE] = v9fs_remove, | |
1206 | }; | |
1207 | ||
1208 | static void submit_pdu(V9fsState *s, V9fsPDU *pdu) | |
1209 | { | |
1210 | pdu_handler_t *handler; | |
1211 | ||
1212 | if (debug_9p_pdu) { | |
1213 | pprint_pdu(pdu); | |
1214 | } | |
1215 | ||
1216 | BUG_ON(pdu->id >= ARRAY_SIZE(pdu_handlers)); | |
1217 | ||
1218 | handler = pdu_handlers[pdu->id]; | |
1219 | BUG_ON(handler == NULL); | |
1220 | ||
1221 | handler(s, pdu); | |
1222 | } | |
1223 | ||
1224 | static void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq) | |
1225 | { | |
1226 | V9fsState *s = (V9fsState *)vdev; | |
1227 | V9fsPDU *pdu; | |
1228 | ssize_t len; | |
1229 | ||
1230 | while ((pdu = alloc_pdu(s)) && | |
1231 | (len = virtqueue_pop(vq, &pdu->elem)) != 0) { | |
1232 | uint8_t *ptr; | |
1233 | ||
1234 | BUG_ON(pdu->elem.out_num == 0 || pdu->elem.in_num == 0); | |
1235 | BUG_ON(pdu->elem.out_sg[0].iov_len < 7); | |
1236 | ||
1237 | ptr = pdu->elem.out_sg[0].iov_base; | |
1238 | ||
1239 | memcpy(&pdu->size, ptr, 4); | |
1240 | pdu->id = ptr[4]; | |
1241 | memcpy(&pdu->tag, ptr + 5, 2); | |
1242 | ||
1243 | submit_pdu(s, pdu); | |
1244 | } | |
1245 | ||
1246 | free_pdu(s, pdu); | |
1247 | } | |
1248 | ||
1249 | static uint32_t virtio_9p_get_features(VirtIODevice *vdev, uint32_t features) | |
1250 | { | |
1251 | features |= 1 << VIRTIO_9P_MOUNT_TAG; | |
1252 | return features; | |
1253 | } | |
1254 | ||
1255 | static V9fsState *to_virtio_9p(VirtIODevice *vdev) | |
1256 | { | |
1257 | return (V9fsState *)vdev; | |
1258 | } | |
1259 | ||
1260 | static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config) | |
1261 | { | |
1262 | struct virtio_9p_config *cfg; | |
1263 | V9fsState *s = to_virtio_9p(vdev); | |
1264 | ||
1265 | cfg = qemu_mallocz(sizeof(struct virtio_9p_config) + | |
1266 | s->tag_len); | |
1267 | stw_raw(&cfg->tag_len, s->tag_len); | |
1268 | memcpy(cfg->tag, s->tag, s->tag_len); | |
1269 | memcpy(config, cfg, s->config_size); | |
1270 | qemu_free(cfg); | |
1271 | } | |
1272 | ||
1273 | VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf) | |
1274 | { | |
1275 | V9fsState *s; | |
1276 | int i, len; | |
1277 | struct stat stat; | |
1278 | FsTypeEntry *fse; | |
1279 | ||
1280 | ||
1281 | s = (V9fsState *)virtio_common_init("virtio-9p", | |
1282 | VIRTIO_ID_9P, | |
1283 | sizeof(struct virtio_9p_config)+ | |
1284 | MAX_TAG_LEN, | |
1285 | sizeof(V9fsState)); | |
1286 | ||
1287 | /* initialize pdu allocator */ | |
1288 | QLIST_INIT(&s->free_list); | |
1289 | for (i = 0; i < (MAX_REQ - 1); i++) { | |
1290 | QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next); | |
1291 | } | |
1292 | ||
1293 | s->vq = virtio_add_queue(&s->vdev, MAX_REQ, handle_9p_output); | |
1294 | ||
1295 | fse = get_fsdev_fsentry(conf->fsdev_id); | |
1296 | ||
1297 | if (!fse) { | |
1298 | /* We don't have a fsdev identified by fsdev_id */ | |
1299 | fprintf(stderr, "Virtio-9p device couldn't find fsdev " | |
1300 | "with the id %s\n", conf->fsdev_id); | |
1301 | exit(1); | |
1302 | } | |
1303 | ||
1304 | if (!fse->path || !conf->tag) { | |
1305 | /* we haven't specified a mount_tag or the path */ | |
1306 | fprintf(stderr, "fsdev with id %s needs path " | |
1307 | "and Virtio-9p device needs mount_tag arguments\n", | |
1308 | conf->fsdev_id); | |
1309 | exit(1); | |
1310 | } | |
1311 | ||
1312 | if (lstat(fse->path, &stat)) { | |
1313 | fprintf(stderr, "share path %s does not exist\n", fse->path); | |
1314 | exit(1); | |
1315 | } else if (!S_ISDIR(stat.st_mode)) { | |
1316 | fprintf(stderr, "share path %s is not a directory \n", fse->path); | |
1317 | exit(1); | |
1318 | } | |
1319 | ||
1320 | s->ctx.fs_root = qemu_strdup(fse->path); | |
1321 | len = strlen(conf->tag); | |
1322 | if (len > MAX_TAG_LEN) { | |
1323 | len = MAX_TAG_LEN; | |
1324 | } | |
1325 | /* s->tag is non-NULL terminated string */ | |
1326 | s->tag = qemu_malloc(len); | |
1327 | memcpy(s->tag, conf->tag, len); | |
1328 | s->tag_len = len; | |
1329 | s->ctx.uid = -1; | |
1330 | ||
1331 | s->ops = fse->ops; | |
1332 | s->vdev.get_features = virtio_9p_get_features; | |
1333 | s->config_size = sizeof(struct virtio_9p_config) + | |
1334 | s->tag_len; | |
1335 | s->vdev.get_config = virtio_9p_get_config; | |
1336 | ||
1337 | return &s->vdev; | |
1338 | } |