]>
Commit | Line | Data |
---|---|---|
fc01f7e7 FB |
1 | /* |
2 | * QEMU System Emulator block driver | |
3 | * | |
4 | * Copyright (c) 2003 Fabrice Bellard | |
5 | * | |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
fc01f7e7 | 24 | #include "vl.h" |
ea2384d3 | 25 | #include "block_int.h" |
fc01f7e7 | 26 | |
7674e7bf FB |
27 | #ifdef _BSD |
28 | #include <sys/types.h> | |
29 | #include <sys/stat.h> | |
30 | #include <sys/ioctl.h> | |
31 | #include <sys/queue.h> | |
32 | #include <sys/disk.h> | |
33 | #endif | |
34 | ||
b338082b | 35 | static BlockDriverState *bdrv_first; |
ea2384d3 FB |
36 | static BlockDriver *first_drv; |
37 | ||
38 | void bdrv_register(BlockDriver *bdrv) | |
39 | { | |
40 | bdrv->next = first_drv; | |
41 | first_drv = bdrv; | |
42 | } | |
b338082b FB |
43 | |
44 | /* create a new block device (by default it is empty) */ | |
45 | BlockDriverState *bdrv_new(const char *device_name) | |
46 | { | |
47 | BlockDriverState **pbs, *bs; | |
48 | ||
49 | bs = qemu_mallocz(sizeof(BlockDriverState)); | |
50 | if(!bs) | |
51 | return NULL; | |
52 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); | |
ea2384d3 FB |
53 | if (device_name[0] != '\0') { |
54 | /* insert at the end */ | |
55 | pbs = &bdrv_first; | |
56 | while (*pbs != NULL) | |
57 | pbs = &(*pbs)->next; | |
58 | *pbs = bs; | |
59 | } | |
b338082b FB |
60 | return bs; |
61 | } | |
62 | ||
ea2384d3 FB |
63 | BlockDriver *bdrv_find_format(const char *format_name) |
64 | { | |
65 | BlockDriver *drv1; | |
66 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { | |
67 | if (!strcmp(drv1->format_name, format_name)) | |
68 | return drv1; | |
69 | } | |
70 | return NULL; | |
71 | } | |
72 | ||
73 | int bdrv_create(BlockDriver *drv, | |
74 | const char *filename, int64_t size_in_sectors, | |
75 | const char *backing_file, int flags) | |
76 | { | |
77 | if (!drv->bdrv_create) | |
78 | return -ENOTSUP; | |
79 | return drv->bdrv_create(filename, size_in_sectors, backing_file, flags); | |
80 | } | |
81 | ||
d5249393 FB |
82 | #ifdef _WIN32 |
83 | static void get_tmp_filename(char *filename, int size) | |
84 | { | |
85 | /* XXX: find a better function */ | |
86 | tmpnam(filename); | |
87 | } | |
88 | #else | |
ea2384d3 | 89 | static void get_tmp_filename(char *filename, int size) |
fc01f7e7 | 90 | { |
67b915a5 | 91 | int fd; |
d5249393 | 92 | /* XXX: race condition possible */ |
ea2384d3 FB |
93 | pstrcpy(filename, size, "/tmp/vl.XXXXXX"); |
94 | fd = mkstemp(filename); | |
95 | close(fd); | |
96 | } | |
d5249393 | 97 | #endif |
fc01f7e7 | 98 | |
7674e7bf FB |
99 | /* XXX: force raw format if block or character device ? It would |
100 | simplify the BSD case */ | |
ea2384d3 FB |
101 | static BlockDriver *find_image_format(const char *filename) |
102 | { | |
103 | int fd, ret, score, score_max; | |
104 | BlockDriver *drv1, *drv; | |
7674e7bf FB |
105 | uint8_t *buf; |
106 | size_t bufsize = 1024; | |
33e3963e | 107 | |
ea2384d3 FB |
108 | fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE); |
109 | if (fd < 0) | |
110 | return NULL; | |
7674e7bf FB |
111 | #ifdef DIOCGSECTORSIZE |
112 | { | |
113 | unsigned int sectorsize = 512; | |
114 | if (!ioctl(fd, DIOCGSECTORSIZE, §orsize) && | |
115 | sectorsize > bufsize) | |
116 | bufsize = sectorsize; | |
117 | } | |
118 | #endif | |
119 | buf = malloc(bufsize); | |
120 | if (!buf) | |
121 | return NULL; | |
122 | ret = read(fd, buf, bufsize); | |
ea2384d3 FB |
123 | if (ret < 0) { |
124 | close(fd); | |
7674e7bf | 125 | free(buf); |
ea2384d3 FB |
126 | return NULL; |
127 | } | |
128 | close(fd); | |
129 | ||
130 | drv = NULL; | |
131 | score_max = 0; | |
132 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { | |
133 | score = drv1->bdrv_probe(buf, ret, filename); | |
134 | if (score > score_max) { | |
135 | score_max = score; | |
136 | drv = drv1; | |
0849bf08 | 137 | } |
fc01f7e7 | 138 | } |
7674e7bf | 139 | free(buf); |
ea2384d3 FB |
140 | return drv; |
141 | } | |
142 | ||
143 | int bdrv_open(BlockDriverState *bs, const char *filename, int snapshot) | |
144 | { | |
145 | return bdrv_open2(bs, filename, snapshot, NULL); | |
146 | } | |
147 | ||
148 | int bdrv_open2(BlockDriverState *bs, const char *filename, int snapshot, | |
149 | BlockDriver *drv) | |
150 | { | |
151 | int ret; | |
152 | char tmp_filename[1024]; | |
153 | ||
154 | bs->read_only = 0; | |
155 | bs->is_temporary = 0; | |
156 | bs->encrypted = 0; | |
157 | ||
158 | if (snapshot) { | |
159 | BlockDriverState *bs1; | |
160 | int64_t total_size; | |
161 | ||
162 | /* if snapshot, we create a temporary backing file and open it | |
163 | instead of opening 'filename' directly */ | |
33e3963e | 164 | |
ea2384d3 FB |
165 | /* if there is a backing file, use it */ |
166 | bs1 = bdrv_new(""); | |
167 | if (!bs1) { | |
168 | return -1; | |
169 | } | |
170 | if (bdrv_open(bs1, filename, 0) < 0) { | |
171 | bdrv_delete(bs1); | |
172 | return -1; | |
173 | } | |
174 | total_size = bs1->total_sectors; | |
175 | bdrv_delete(bs1); | |
176 | ||
177 | get_tmp_filename(tmp_filename, sizeof(tmp_filename)); | |
178 | /* XXX: use cow for linux as it is more efficient ? */ | |
179 | if (bdrv_create(&bdrv_qcow, tmp_filename, | |
180 | total_size, filename, 0) < 0) { | |
181 | return -1; | |
182 | } | |
183 | filename = tmp_filename; | |
184 | bs->is_temporary = 1; | |
185 | } | |
186 | ||
187 | pstrcpy(bs->filename, sizeof(bs->filename), filename); | |
188 | if (!drv) { | |
189 | drv = find_image_format(filename); | |
190 | if (!drv) | |
191 | return -1; | |
192 | } | |
193 | bs->drv = drv; | |
194 | bs->opaque = qemu_mallocz(drv->instance_size); | |
195 | if (bs->opaque == NULL && drv->instance_size > 0) | |
196 | return -1; | |
197 | ||
198 | ret = drv->bdrv_open(bs, filename); | |
199 | if (ret < 0) { | |
200 | qemu_free(bs->opaque); | |
201 | return -1; | |
33e3963e | 202 | } |
67b915a5 | 203 | #ifndef _WIN32 |
ea2384d3 FB |
204 | if (bs->is_temporary) { |
205 | unlink(filename); | |
206 | } | |
207 | #endif | |
208 | if (bs->backing_file[0] != '\0' && drv->bdrv_is_allocated) { | |
209 | /* if there is a backing file, use it */ | |
210 | bs->backing_hd = bdrv_new(""); | |
211 | if (!bs->backing_hd) { | |
212 | fail: | |
213 | bdrv_close(bs); | |
214 | return -1; | |
33e3963e | 215 | } |
ea2384d3 | 216 | if (bdrv_open(bs->backing_hd, bs->backing_file, 0) < 0) |
33e3963e | 217 | goto fail; |
33e3963e FB |
218 | } |
219 | ||
b338082b FB |
220 | bs->inserted = 1; |
221 | ||
222 | /* call the change callback */ | |
223 | if (bs->change_cb) | |
224 | bs->change_cb(bs->change_opaque); | |
225 | ||
226 | return 0; | |
fc01f7e7 FB |
227 | } |
228 | ||
229 | void bdrv_close(BlockDriverState *bs) | |
230 | { | |
b338082b | 231 | if (bs->inserted) { |
ea2384d3 FB |
232 | if (bs->backing_hd) |
233 | bdrv_delete(bs->backing_hd); | |
234 | bs->drv->bdrv_close(bs); | |
235 | qemu_free(bs->opaque); | |
236 | #ifdef _WIN32 | |
237 | if (bs->is_temporary) { | |
238 | unlink(bs->filename); | |
239 | } | |
67b915a5 | 240 | #endif |
ea2384d3 FB |
241 | bs->opaque = NULL; |
242 | bs->drv = NULL; | |
b338082b FB |
243 | bs->inserted = 0; |
244 | ||
245 | /* call the change callback */ | |
246 | if (bs->change_cb) | |
247 | bs->change_cb(bs->change_opaque); | |
248 | } | |
249 | } | |
250 | ||
251 | void bdrv_delete(BlockDriverState *bs) | |
252 | { | |
ea2384d3 | 253 | /* XXX: remove the driver list */ |
b338082b FB |
254 | bdrv_close(bs); |
255 | qemu_free(bs); | |
fc01f7e7 FB |
256 | } |
257 | ||
33e3963e FB |
258 | /* commit COW file into the raw image */ |
259 | int bdrv_commit(BlockDriverState *bs) | |
260 | { | |
261 | int64_t i; | |
ea2384d3 FB |
262 | int n, j; |
263 | unsigned char sector[512]; | |
33e3963e | 264 | |
b338082b | 265 | if (!bs->inserted) |
ea2384d3 | 266 | return -ENOENT; |
33e3963e FB |
267 | |
268 | if (bs->read_only) { | |
ea2384d3 | 269 | return -EACCES; |
33e3963e FB |
270 | } |
271 | ||
ea2384d3 FB |
272 | if (!bs->backing_hd) { |
273 | return -ENOTSUP; | |
274 | } | |
33e3963e | 275 | |
ea2384d3 FB |
276 | for (i = 0; i < bs->total_sectors;) { |
277 | if (bs->drv->bdrv_is_allocated(bs, i, 65536, &n)) { | |
278 | for(j = 0; j < n; j++) { | |
279 | if (bdrv_read(bs, i, sector, 1) != 0) { | |
280 | return -EIO; | |
281 | } | |
282 | ||
283 | if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { | |
284 | return -EIO; | |
285 | } | |
286 | i++; | |
33e3963e | 287 | } |
ea2384d3 FB |
288 | } else { |
289 | i += n; | |
290 | } | |
33e3963e | 291 | } |
33e3963e FB |
292 | return 0; |
293 | } | |
294 | ||
fc01f7e7 FB |
295 | /* return -1 if error */ |
296 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, | |
297 | uint8_t *buf, int nb_sectors) | |
298 | { | |
ea2384d3 FB |
299 | int ret, n; |
300 | BlockDriver *drv = bs->drv; | |
301 | ||
b338082b FB |
302 | if (!bs->inserted) |
303 | return -1; | |
304 | ||
33e3963e | 305 | while (nb_sectors > 0) { |
ea2384d3 | 306 | if (sector_num == 0 && bs->boot_sector_enabled) { |
cf98951b FB |
307 | memcpy(buf, bs->boot_sector_data, 512); |
308 | n = 1; | |
ea2384d3 FB |
309 | } else if (bs->backing_hd) { |
310 | if (drv->bdrv_is_allocated(bs, sector_num, nb_sectors, &n)) { | |
311 | ret = drv->bdrv_read(bs, sector_num, buf, n); | |
312 | if (ret < 0) | |
313 | return -1; | |
314 | } else { | |
315 | /* read from the base image */ | |
316 | ret = bdrv_read(bs->backing_hd, sector_num, buf, n); | |
317 | if (ret < 0) | |
318 | return -1; | |
319 | } | |
33e3963e | 320 | } else { |
ea2384d3 FB |
321 | ret = drv->bdrv_read(bs, sector_num, buf, nb_sectors); |
322 | if (ret < 0) | |
33e3963e | 323 | return -1; |
ea2384d3 FB |
324 | /* no need to loop */ |
325 | break; | |
33e3963e FB |
326 | } |
327 | nb_sectors -= n; | |
328 | sector_num += n; | |
329 | buf += n * 512; | |
330 | } | |
331 | return 0; | |
fc01f7e7 FB |
332 | } |
333 | ||
334 | /* return -1 if error */ | |
335 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, | |
336 | const uint8_t *buf, int nb_sectors) | |
337 | { | |
b338082b FB |
338 | if (!bs->inserted) |
339 | return -1; | |
0849bf08 FB |
340 | if (bs->read_only) |
341 | return -1; | |
ea2384d3 | 342 | return bs->drv->bdrv_write(bs, sector_num, buf, nb_sectors); |
fc01f7e7 FB |
343 | } |
344 | ||
345 | void bdrv_get_geometry(BlockDriverState *bs, int64_t *nb_sectors_ptr) | |
346 | { | |
347 | *nb_sectors_ptr = bs->total_sectors; | |
348 | } | |
cf98951b FB |
349 | |
350 | /* force a given boot sector. */ | |
351 | void bdrv_set_boot_sector(BlockDriverState *bs, const uint8_t *data, int size) | |
352 | { | |
353 | bs->boot_sector_enabled = 1; | |
354 | if (size > 512) | |
355 | size = 512; | |
356 | memcpy(bs->boot_sector_data, data, size); | |
357 | memset(bs->boot_sector_data + size, 0, 512 - size); | |
358 | } | |
b338082b FB |
359 | |
360 | void bdrv_set_geometry_hint(BlockDriverState *bs, | |
361 | int cyls, int heads, int secs) | |
362 | { | |
363 | bs->cyls = cyls; | |
364 | bs->heads = heads; | |
365 | bs->secs = secs; | |
366 | } | |
367 | ||
368 | void bdrv_set_type_hint(BlockDriverState *bs, int type) | |
369 | { | |
370 | bs->type = type; | |
371 | bs->removable = ((type == BDRV_TYPE_CDROM || | |
372 | type == BDRV_TYPE_FLOPPY)); | |
373 | } | |
374 | ||
46d4767d FB |
375 | void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
376 | { | |
377 | bs->translation = translation; | |
378 | } | |
379 | ||
b338082b FB |
380 | void bdrv_get_geometry_hint(BlockDriverState *bs, |
381 | int *pcyls, int *pheads, int *psecs) | |
382 | { | |
383 | *pcyls = bs->cyls; | |
384 | *pheads = bs->heads; | |
385 | *psecs = bs->secs; | |
386 | } | |
387 | ||
388 | int bdrv_get_type_hint(BlockDriverState *bs) | |
389 | { | |
390 | return bs->type; | |
391 | } | |
392 | ||
46d4767d FB |
393 | int bdrv_get_translation_hint(BlockDriverState *bs) |
394 | { | |
395 | return bs->translation; | |
396 | } | |
397 | ||
b338082b FB |
398 | int bdrv_is_removable(BlockDriverState *bs) |
399 | { | |
400 | return bs->removable; | |
401 | } | |
402 | ||
403 | int bdrv_is_read_only(BlockDriverState *bs) | |
404 | { | |
405 | return bs->read_only; | |
406 | } | |
407 | ||
408 | int bdrv_is_inserted(BlockDriverState *bs) | |
409 | { | |
410 | return bs->inserted; | |
411 | } | |
412 | ||
413 | int bdrv_is_locked(BlockDriverState *bs) | |
414 | { | |
415 | return bs->locked; | |
416 | } | |
417 | ||
418 | void bdrv_set_locked(BlockDriverState *bs, int locked) | |
419 | { | |
420 | bs->locked = locked; | |
421 | } | |
422 | ||
423 | void bdrv_set_change_cb(BlockDriverState *bs, | |
424 | void (*change_cb)(void *opaque), void *opaque) | |
425 | { | |
426 | bs->change_cb = change_cb; | |
427 | bs->change_opaque = opaque; | |
428 | } | |
429 | ||
ea2384d3 FB |
430 | int bdrv_is_encrypted(BlockDriverState *bs) |
431 | { | |
432 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
433 | return 1; | |
434 | return bs->encrypted; | |
435 | } | |
436 | ||
437 | int bdrv_set_key(BlockDriverState *bs, const char *key) | |
438 | { | |
439 | int ret; | |
440 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
441 | ret = bdrv_set_key(bs->backing_hd, key); | |
442 | if (ret < 0) | |
443 | return ret; | |
444 | if (!bs->encrypted) | |
445 | return 0; | |
446 | } | |
447 | if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key) | |
448 | return -1; | |
449 | return bs->drv->bdrv_set_key(bs, key); | |
450 | } | |
451 | ||
452 | void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) | |
453 | { | |
454 | if (!bs->inserted || !bs->drv) { | |
455 | buf[0] = '\0'; | |
456 | } else { | |
457 | pstrcpy(buf, buf_size, bs->drv->format_name); | |
458 | } | |
459 | } | |
460 | ||
461 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), | |
462 | void *opaque) | |
463 | { | |
464 | BlockDriver *drv; | |
465 | ||
466 | for (drv = first_drv; drv != NULL; drv = drv->next) { | |
467 | it(opaque, drv->format_name); | |
468 | } | |
469 | } | |
470 | ||
b338082b FB |
471 | BlockDriverState *bdrv_find(const char *name) |
472 | { | |
473 | BlockDriverState *bs; | |
474 | ||
475 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
476 | if (!strcmp(name, bs->device_name)) | |
477 | return bs; | |
478 | } | |
479 | return NULL; | |
480 | } | |
481 | ||
81d0912d FB |
482 | void bdrv_iterate(void (*it)(void *opaque, const char *name), void *opaque) |
483 | { | |
484 | BlockDriverState *bs; | |
485 | ||
486 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
487 | it(opaque, bs->device_name); | |
488 | } | |
489 | } | |
490 | ||
ea2384d3 FB |
491 | const char *bdrv_get_device_name(BlockDriverState *bs) |
492 | { | |
493 | return bs->device_name; | |
494 | } | |
495 | ||
b338082b FB |
496 | void bdrv_info(void) |
497 | { | |
498 | BlockDriverState *bs; | |
499 | ||
500 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
501 | term_printf("%s:", bs->device_name); | |
502 | term_printf(" type="); | |
503 | switch(bs->type) { | |
504 | case BDRV_TYPE_HD: | |
505 | term_printf("hd"); | |
506 | break; | |
507 | case BDRV_TYPE_CDROM: | |
508 | term_printf("cdrom"); | |
509 | break; | |
510 | case BDRV_TYPE_FLOPPY: | |
511 | term_printf("floppy"); | |
512 | break; | |
513 | } | |
514 | term_printf(" removable=%d", bs->removable); | |
515 | if (bs->removable) { | |
516 | term_printf(" locked=%d", bs->locked); | |
517 | } | |
518 | if (bs->inserted) { | |
519 | term_printf(" file=%s", bs->filename); | |
ea2384d3 FB |
520 | if (bs->backing_file[0] != '\0') |
521 | term_printf(" backing_file=%s", bs->backing_file); | |
b338082b | 522 | term_printf(" ro=%d", bs->read_only); |
ea2384d3 FB |
523 | term_printf(" drv=%s", bs->drv->format_name); |
524 | if (bs->encrypted) | |
525 | term_printf(" encrypted"); | |
b338082b FB |
526 | } else { |
527 | term_printf(" [not inserted]"); | |
528 | } | |
529 | term_printf("\n"); | |
530 | } | |
531 | } | |
ea2384d3 FB |
532 | |
533 | ||
534 | /**************************************************************/ | |
535 | /* RAW block driver */ | |
536 | ||
537 | typedef struct BDRVRawState { | |
538 | int fd; | |
539 | } BDRVRawState; | |
540 | ||
541 | static int raw_probe(const uint8_t *buf, int buf_size, const char *filename) | |
542 | { | |
543 | return 1; /* maybe */ | |
544 | } | |
545 | ||
546 | static int raw_open(BlockDriverState *bs, const char *filename) | |
547 | { | |
548 | BDRVRawState *s = bs->opaque; | |
549 | int fd; | |
550 | int64_t size; | |
e5484d33 FB |
551 | #ifdef _BSD |
552 | struct stat sb; | |
553 | #endif | |
ea2384d3 FB |
554 | |
555 | fd = open(filename, O_RDWR | O_BINARY | O_LARGEFILE); | |
556 | if (fd < 0) { | |
557 | fd = open(filename, O_RDONLY | O_BINARY | O_LARGEFILE); | |
558 | if (fd < 0) | |
559 | return -1; | |
560 | bs->read_only = 1; | |
561 | } | |
7674e7bf | 562 | #ifdef _BSD |
e5484d33 | 563 | if (!fstat(fd, &sb) && (S_IFCHR & sb.st_mode)) { |
7674e7bf | 564 | #ifdef DIOCGMEDIASIZE |
e5484d33 | 565 | if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size)) |
7674e7bf | 566 | #endif |
e5484d33 | 567 | size = lseek(fd, 0LL, SEEK_END); |
7674e7bf FB |
568 | } else |
569 | #endif | |
570 | { | |
571 | size = lseek(fd, 0, SEEK_END); | |
572 | } | |
c747cd1f FB |
573 | #ifdef _WIN32 |
574 | /* On Windows hosts it can happen that we're unable to get file size | |
575 | for CD-ROM raw device (it's inherent limitation of the CDFS driver). */ | |
576 | if (size == -1) | |
577 | size = LONG_LONG_MAX; | |
578 | #endif | |
ea2384d3 FB |
579 | bs->total_sectors = size / 512; |
580 | s->fd = fd; | |
581 | return 0; | |
582 | } | |
583 | ||
584 | static int raw_read(BlockDriverState *bs, int64_t sector_num, | |
585 | uint8_t *buf, int nb_sectors) | |
586 | { | |
587 | BDRVRawState *s = bs->opaque; | |
588 | int ret; | |
589 | ||
d5249393 | 590 | lseek(s->fd, sector_num * 512, SEEK_SET); |
ea2384d3 FB |
591 | ret = read(s->fd, buf, nb_sectors * 512); |
592 | if (ret != nb_sectors * 512) | |
593 | return -1; | |
594 | return 0; | |
595 | } | |
596 | ||
597 | static int raw_write(BlockDriverState *bs, int64_t sector_num, | |
598 | const uint8_t *buf, int nb_sectors) | |
599 | { | |
600 | BDRVRawState *s = bs->opaque; | |
601 | int ret; | |
602 | ||
d5249393 | 603 | lseek(s->fd, sector_num * 512, SEEK_SET); |
ea2384d3 FB |
604 | ret = write(s->fd, buf, nb_sectors * 512); |
605 | if (ret != nb_sectors * 512) | |
606 | return -1; | |
607 | return 0; | |
608 | } | |
609 | ||
e2731add | 610 | static void raw_close(BlockDriverState *bs) |
ea2384d3 FB |
611 | { |
612 | BDRVRawState *s = bs->opaque; | |
613 | close(s->fd); | |
614 | } | |
615 | ||
616 | static int raw_create(const char *filename, int64_t total_size, | |
617 | const char *backing_file, int flags) | |
618 | { | |
619 | int fd; | |
620 | ||
621 | if (flags || backing_file) | |
622 | return -ENOTSUP; | |
623 | ||
624 | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY | O_LARGEFILE, | |
625 | 0644); | |
626 | if (fd < 0) | |
627 | return -EIO; | |
d5249393 | 628 | ftruncate(fd, total_size * 512); |
ea2384d3 FB |
629 | close(fd); |
630 | return 0; | |
631 | } | |
632 | ||
633 | BlockDriver bdrv_raw = { | |
634 | "raw", | |
635 | sizeof(BDRVRawState), | |
636 | raw_probe, | |
637 | raw_open, | |
638 | raw_read, | |
639 | raw_write, | |
640 | raw_close, | |
641 | raw_create, | |
642 | }; | |
643 | ||
644 | void bdrv_init(void) | |
645 | { | |
646 | bdrv_register(&bdrv_raw); | |
647 | #ifndef _WIN32 | |
648 | bdrv_register(&bdrv_cow); | |
649 | #endif | |
650 | bdrv_register(&bdrv_qcow); | |
651 | bdrv_register(&bdrv_vmdk); | |
3c56521b | 652 | bdrv_register(&bdrv_cloop); |
585d0ed9 | 653 | bdrv_register(&bdrv_dmg); |
a8753c34 | 654 | bdrv_register(&bdrv_bochs); |
6a0f9e82 | 655 | bdrv_register(&bdrv_vpc); |
ea2384d3 | 656 | } |