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Commit | Line | Data |
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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 | ||
83f64091 FB |
35 | #define SECTOR_BITS 9 |
36 | #define SECTOR_SIZE (1 << SECTOR_BITS) | |
37 | ||
38 | static int bdrv_aio_new_em(BlockDriverAIOCB *acb); | |
39 | static int bdrv_aio_read_em(BlockDriverAIOCB *acb, int64_t sector_num, | |
40 | uint8_t *buf, int nb_sectors); | |
41 | static int bdrv_aio_write_em(BlockDriverAIOCB *acb, int64_t sector_num, | |
42 | const uint8_t *buf, int nb_sectors); | |
43 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb); | |
44 | static void bdrv_aio_delete_em(BlockDriverAIOCB *acb); | |
45 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, | |
46 | uint8_t *buf, int nb_sectors); | |
47 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, | |
48 | const uint8_t *buf, int nb_sectors); | |
ec530c81 | 49 | |
b338082b | 50 | static BlockDriverState *bdrv_first; |
ea2384d3 FB |
51 | static BlockDriver *first_drv; |
52 | ||
83f64091 FB |
53 | #ifdef _WIN32 |
54 | #define PATH_SEP '\\' | |
55 | #else | |
56 | #define PATH_SEP '/' | |
57 | #endif | |
3b0d4f61 | 58 | |
83f64091 | 59 | int path_is_absolute(const char *path) |
3b0d4f61 | 60 | { |
83f64091 FB |
61 | const char *p; |
62 | p = strchr(path, ':'); | |
63 | if (p) | |
64 | p++; | |
65 | else | |
66 | p = path; | |
67 | return (*p == PATH_SEP); | |
3b0d4f61 FB |
68 | } |
69 | ||
83f64091 FB |
70 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
71 | path to it by considering it is relative to base_path. URL are | |
72 | supported. */ | |
73 | void path_combine(char *dest, int dest_size, | |
74 | const char *base_path, | |
75 | const char *filename) | |
3b0d4f61 | 76 | { |
83f64091 FB |
77 | const char *p, *p1; |
78 | int len; | |
79 | ||
80 | if (dest_size <= 0) | |
81 | return; | |
82 | if (path_is_absolute(filename)) { | |
83 | pstrcpy(dest, dest_size, filename); | |
84 | } else { | |
85 | p = strchr(base_path, ':'); | |
86 | if (p) | |
87 | p++; | |
88 | else | |
89 | p = base_path; | |
90 | p1 = strrchr(base_path, PATH_SEP); | |
91 | if (p1) | |
92 | p1++; | |
93 | else | |
94 | p1 = base_path; | |
95 | if (p1 > p) | |
96 | p = p1; | |
97 | len = p - base_path; | |
98 | if (len > dest_size - 1) | |
99 | len = dest_size - 1; | |
100 | memcpy(dest, base_path, len); | |
101 | dest[len] = '\0'; | |
102 | pstrcat(dest, dest_size, filename); | |
3b0d4f61 | 103 | } |
3b0d4f61 FB |
104 | } |
105 | ||
3b0d4f61 | 106 | |
ea2384d3 FB |
107 | void bdrv_register(BlockDriver *bdrv) |
108 | { | |
83f64091 FB |
109 | if (!bdrv->bdrv_aio_new) { |
110 | /* add AIO emulation layer */ | |
111 | bdrv->bdrv_aio_new = bdrv_aio_new_em; | |
112 | bdrv->bdrv_aio_read = bdrv_aio_read_em; | |
113 | bdrv->bdrv_aio_write = bdrv_aio_write_em; | |
114 | bdrv->bdrv_aio_cancel = bdrv_aio_cancel_em; | |
115 | bdrv->bdrv_aio_delete = bdrv_aio_delete_em; | |
116 | } else if (!bdrv->bdrv_read && !bdrv->bdrv_pread) { | |
117 | /* add synchronous IO emulation layer */ | |
118 | bdrv->bdrv_read = bdrv_read_em; | |
119 | bdrv->bdrv_write = bdrv_write_em; | |
120 | } | |
ea2384d3 FB |
121 | bdrv->next = first_drv; |
122 | first_drv = bdrv; | |
123 | } | |
b338082b FB |
124 | |
125 | /* create a new block device (by default it is empty) */ | |
126 | BlockDriverState *bdrv_new(const char *device_name) | |
127 | { | |
128 | BlockDriverState **pbs, *bs; | |
129 | ||
130 | bs = qemu_mallocz(sizeof(BlockDriverState)); | |
131 | if(!bs) | |
132 | return NULL; | |
133 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); | |
ea2384d3 FB |
134 | if (device_name[0] != '\0') { |
135 | /* insert at the end */ | |
136 | pbs = &bdrv_first; | |
137 | while (*pbs != NULL) | |
138 | pbs = &(*pbs)->next; | |
139 | *pbs = bs; | |
140 | } | |
b338082b FB |
141 | return bs; |
142 | } | |
143 | ||
ea2384d3 FB |
144 | BlockDriver *bdrv_find_format(const char *format_name) |
145 | { | |
146 | BlockDriver *drv1; | |
147 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { | |
148 | if (!strcmp(drv1->format_name, format_name)) | |
149 | return drv1; | |
150 | } | |
151 | return NULL; | |
152 | } | |
153 | ||
154 | int bdrv_create(BlockDriver *drv, | |
155 | const char *filename, int64_t size_in_sectors, | |
156 | const char *backing_file, int flags) | |
157 | { | |
158 | if (!drv->bdrv_create) | |
159 | return -ENOTSUP; | |
160 | return drv->bdrv_create(filename, size_in_sectors, backing_file, flags); | |
161 | } | |
162 | ||
d5249393 | 163 | #ifdef _WIN32 |
95389c86 | 164 | void get_tmp_filename(char *filename, int size) |
d5249393 | 165 | { |
83f64091 | 166 | tmpnam(filename); |
d5249393 FB |
167 | } |
168 | #else | |
95389c86 | 169 | void get_tmp_filename(char *filename, int size) |
fc01f7e7 | 170 | { |
67b915a5 | 171 | int fd; |
d5249393 | 172 | /* XXX: race condition possible */ |
ea2384d3 FB |
173 | pstrcpy(filename, size, "/tmp/vl.XXXXXX"); |
174 | fd = mkstemp(filename); | |
175 | close(fd); | |
176 | } | |
d5249393 | 177 | #endif |
fc01f7e7 | 178 | |
83f64091 FB |
179 | static BlockDriver *find_protocol(const char *filename) |
180 | { | |
181 | BlockDriver *drv1; | |
182 | char protocol[128]; | |
183 | int len; | |
184 | const char *p; | |
185 | p = strchr(filename, ':'); | |
186 | if (!p) | |
187 | return &bdrv_raw; | |
188 | len = p - filename; | |
189 | if (len > sizeof(protocol) - 1) | |
190 | len = sizeof(protocol) - 1; | |
191 | #ifdef _WIN32 | |
192 | if (len == 1) { | |
193 | /* specific win32 case for driver letters */ | |
194 | return &bdrv_raw; | |
195 | } | |
196 | #endif | |
197 | memcpy(protocol, filename, len); | |
198 | protocol[len] = '\0'; | |
199 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { | |
200 | if (drv1->protocol_name && | |
201 | !strcmp(drv1->protocol_name, protocol)) | |
202 | return drv1; | |
203 | } | |
204 | return NULL; | |
205 | } | |
206 | ||
7674e7bf FB |
207 | /* XXX: force raw format if block or character device ? It would |
208 | simplify the BSD case */ | |
ea2384d3 FB |
209 | static BlockDriver *find_image_format(const char *filename) |
210 | { | |
83f64091 | 211 | int ret, score, score_max; |
ea2384d3 | 212 | BlockDriver *drv1, *drv; |
83f64091 FB |
213 | uint8_t buf[2048]; |
214 | BlockDriverState *bs; | |
ea2384d3 | 215 | |
83f64091 FB |
216 | drv = find_protocol(filename); |
217 | /* no need to test disk image formats for vvfat or host specific | |
218 | devices */ | |
219 | if (drv == &bdrv_vvfat) | |
220 | return drv; | |
221 | if (strstart(filename, "/dev/", NULL)) | |
222 | return &bdrv_raw; | |
223 | ||
224 | ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY); | |
225 | if (ret < 0) | |
226 | return NULL; | |
227 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); | |
228 | bdrv_delete(bs); | |
229 | if (ret < 0) { | |
230 | return NULL; | |
231 | } | |
232 | ||
ea2384d3 FB |
233 | score_max = 0; |
234 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { | |
83f64091 FB |
235 | if (drv1->bdrv_probe) { |
236 | score = drv1->bdrv_probe(buf, ret, filename); | |
237 | if (score > score_max) { | |
238 | score_max = score; | |
239 | drv = drv1; | |
240 | } | |
0849bf08 | 241 | } |
fc01f7e7 | 242 | } |
ea2384d3 FB |
243 | return drv; |
244 | } | |
245 | ||
83f64091 | 246 | int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
ea2384d3 | 247 | { |
83f64091 FB |
248 | BlockDriverState *bs; |
249 | int ret; | |
250 | ||
251 | bs = bdrv_new(""); | |
252 | if (!bs) | |
253 | return -ENOMEM; | |
254 | ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL); | |
255 | if (ret < 0) { | |
256 | bdrv_delete(bs); | |
257 | return ret; | |
3b0d4f61 | 258 | } |
83f64091 FB |
259 | *pbs = bs; |
260 | return 0; | |
261 | } | |
262 | ||
263 | int bdrv_open(BlockDriverState *bs, const char *filename, int flags) | |
264 | { | |
265 | return bdrv_open2(bs, filename, flags, NULL); | |
ea2384d3 FB |
266 | } |
267 | ||
83f64091 | 268 | int bdrv_open2(BlockDriverState *bs, const char *filename, int flags, |
ea2384d3 FB |
269 | BlockDriver *drv) |
270 | { | |
83f64091 | 271 | int ret, open_flags; |
ea2384d3 | 272 | char tmp_filename[1024]; |
83f64091 | 273 | char backing_filename[1024]; |
ea2384d3 FB |
274 | |
275 | bs->read_only = 0; | |
276 | bs->is_temporary = 0; | |
277 | bs->encrypted = 0; | |
712e7874 | 278 | |
83f64091 | 279 | if (flags & BDRV_O_SNAPSHOT) { |
ea2384d3 FB |
280 | BlockDriverState *bs1; |
281 | int64_t total_size; | |
282 | ||
283 | /* if snapshot, we create a temporary backing file and open it | |
284 | instead of opening 'filename' directly */ | |
33e3963e | 285 | |
ea2384d3 FB |
286 | /* if there is a backing file, use it */ |
287 | bs1 = bdrv_new(""); | |
288 | if (!bs1) { | |
83f64091 | 289 | return -ENOMEM; |
ea2384d3 FB |
290 | } |
291 | if (bdrv_open(bs1, filename, 0) < 0) { | |
292 | bdrv_delete(bs1); | |
293 | return -1; | |
294 | } | |
83f64091 | 295 | total_size = bdrv_getlength(bs1) >> SECTOR_BITS; |
ea2384d3 FB |
296 | bdrv_delete(bs1); |
297 | ||
298 | get_tmp_filename(tmp_filename, sizeof(tmp_filename)); | |
ea2384d3 FB |
299 | if (bdrv_create(&bdrv_qcow, tmp_filename, |
300 | total_size, filename, 0) < 0) { | |
301 | return -1; | |
302 | } | |
303 | filename = tmp_filename; | |
304 | bs->is_temporary = 1; | |
305 | } | |
712e7874 | 306 | |
ea2384d3 | 307 | pstrcpy(bs->filename, sizeof(bs->filename), filename); |
83f64091 FB |
308 | if (flags & BDRV_O_FILE) { |
309 | drv = find_protocol(filename); | |
ea2384d3 | 310 | if (!drv) |
83f64091 FB |
311 | return -ENOENT; |
312 | } else { | |
313 | if (!drv) { | |
314 | drv = find_image_format(filename); | |
315 | if (!drv) | |
316 | return -1; | |
317 | } | |
ea2384d3 FB |
318 | } |
319 | bs->drv = drv; | |
320 | bs->opaque = qemu_mallocz(drv->instance_size); | |
321 | if (bs->opaque == NULL && drv->instance_size > 0) | |
322 | return -1; | |
83f64091 FB |
323 | /* Note: for compatibility, we open disk image files as RDWR, and |
324 | RDONLY as fallback */ | |
325 | if (!(flags & BDRV_O_FILE)) | |
326 | open_flags = BDRV_O_RDWR; | |
327 | else | |
328 | open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT); | |
329 | ret = drv->bdrv_open(bs, filename, open_flags); | |
330 | if (ret == -EACCES && !(flags & BDRV_O_FILE)) { | |
331 | ret = drv->bdrv_open(bs, filename, BDRV_O_RDONLY); | |
332 | bs->read_only = 1; | |
333 | } | |
ea2384d3 FB |
334 | if (ret < 0) { |
335 | qemu_free(bs->opaque); | |
83f64091 | 336 | return ret; |
33e3963e | 337 | } |
83f64091 | 338 | |
67b915a5 | 339 | #ifndef _WIN32 |
ea2384d3 FB |
340 | if (bs->is_temporary) { |
341 | unlink(filename); | |
342 | } | |
343 | #endif | |
83f64091 | 344 | if (bs->backing_file[0] != '\0') { |
ea2384d3 FB |
345 | /* if there is a backing file, use it */ |
346 | bs->backing_hd = bdrv_new(""); | |
347 | if (!bs->backing_hd) { | |
348 | fail: | |
349 | bdrv_close(bs); | |
350 | return -1; | |
33e3963e | 351 | } |
83f64091 FB |
352 | path_combine(backing_filename, sizeof(backing_filename), |
353 | filename, bs->backing_file); | |
354 | if (bdrv_open(bs->backing_hd, backing_filename, 0) < 0) | |
33e3963e | 355 | goto fail; |
33e3963e FB |
356 | } |
357 | ||
b338082b FB |
358 | bs->inserted = 1; |
359 | ||
360 | /* call the change callback */ | |
361 | if (bs->change_cb) | |
362 | bs->change_cb(bs->change_opaque); | |
363 | ||
364 | return 0; | |
fc01f7e7 FB |
365 | } |
366 | ||
367 | void bdrv_close(BlockDriverState *bs) | |
368 | { | |
b338082b | 369 | if (bs->inserted) { |
ea2384d3 FB |
370 | if (bs->backing_hd) |
371 | bdrv_delete(bs->backing_hd); | |
372 | bs->drv->bdrv_close(bs); | |
373 | qemu_free(bs->opaque); | |
374 | #ifdef _WIN32 | |
375 | if (bs->is_temporary) { | |
376 | unlink(bs->filename); | |
377 | } | |
67b915a5 | 378 | #endif |
ea2384d3 FB |
379 | bs->opaque = NULL; |
380 | bs->drv = NULL; | |
b338082b FB |
381 | bs->inserted = 0; |
382 | ||
383 | /* call the change callback */ | |
384 | if (bs->change_cb) | |
385 | bs->change_cb(bs->change_opaque); | |
386 | } | |
387 | } | |
388 | ||
389 | void bdrv_delete(BlockDriverState *bs) | |
390 | { | |
ea2384d3 | 391 | /* XXX: remove the driver list */ |
b338082b FB |
392 | bdrv_close(bs); |
393 | qemu_free(bs); | |
fc01f7e7 FB |
394 | } |
395 | ||
33e3963e FB |
396 | /* commit COW file into the raw image */ |
397 | int bdrv_commit(BlockDriverState *bs) | |
398 | { | |
83f64091 | 399 | int64_t i, total_sectors; |
ea2384d3 FB |
400 | int n, j; |
401 | unsigned char sector[512]; | |
33e3963e | 402 | |
b338082b | 403 | if (!bs->inserted) |
ea2384d3 | 404 | return -ENOENT; |
33e3963e FB |
405 | |
406 | if (bs->read_only) { | |
ea2384d3 | 407 | return -EACCES; |
33e3963e FB |
408 | } |
409 | ||
ea2384d3 FB |
410 | if (!bs->backing_hd) { |
411 | return -ENOTSUP; | |
412 | } | |
33e3963e | 413 | |
83f64091 FB |
414 | total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
415 | for (i = 0; i < total_sectors;) { | |
ea2384d3 FB |
416 | if (bs->drv->bdrv_is_allocated(bs, i, 65536, &n)) { |
417 | for(j = 0; j < n; j++) { | |
418 | if (bdrv_read(bs, i, sector, 1) != 0) { | |
419 | return -EIO; | |
420 | } | |
421 | ||
422 | if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { | |
423 | return -EIO; | |
424 | } | |
425 | i++; | |
33e3963e | 426 | } |
ea2384d3 FB |
427 | } else { |
428 | i += n; | |
429 | } | |
33e3963e | 430 | } |
95389c86 FB |
431 | |
432 | if (bs->drv->bdrv_make_empty) | |
433 | return bs->drv->bdrv_make_empty(bs); | |
434 | ||
33e3963e FB |
435 | return 0; |
436 | } | |
437 | ||
83f64091 | 438 | /* return < 0 if error */ |
fc01f7e7 FB |
439 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, |
440 | uint8_t *buf, int nb_sectors) | |
441 | { | |
ea2384d3 FB |
442 | BlockDriver *drv = bs->drv; |
443 | ||
b338082b FB |
444 | if (!bs->inserted) |
445 | return -1; | |
446 | ||
83f64091 | 447 | if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { |
cf98951b | 448 | memcpy(buf, bs->boot_sector_data, 512); |
83f64091 FB |
449 | sector_num++; |
450 | nb_sectors--; | |
451 | buf += 512; | |
452 | if (nb_sectors == 0) | |
453 | return 0; | |
454 | } | |
455 | if (drv->bdrv_pread) { | |
456 | int ret, len; | |
457 | len = nb_sectors * 512; | |
458 | ret = drv->bdrv_pread(bs, sector_num * 512, buf, len); | |
459 | if (ret < 0) | |
460 | return ret; | |
461 | else if (ret != len) | |
462 | return -EIO; | |
463 | else | |
464 | return 0; | |
465 | } else { | |
466 | return drv->bdrv_read(bs, sector_num, buf, nb_sectors); | |
33e3963e | 467 | } |
fc01f7e7 FB |
468 | } |
469 | ||
83f64091 | 470 | /* return < 0 if error */ |
fc01f7e7 FB |
471 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
472 | const uint8_t *buf, int nb_sectors) | |
473 | { | |
83f64091 | 474 | BlockDriver *drv = bs->drv; |
b338082b FB |
475 | if (!bs->inserted) |
476 | return -1; | |
0849bf08 FB |
477 | if (bs->read_only) |
478 | return -1; | |
79639d42 FB |
479 | if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { |
480 | memcpy(bs->boot_sector_data, buf, 512); | |
481 | } | |
83f64091 FB |
482 | if (drv->bdrv_pwrite) { |
483 | int ret, len; | |
484 | len = nb_sectors * 512; | |
485 | ret = drv->bdrv_pwrite(bs, sector_num * 512, buf, len); | |
486 | if (ret < 0) | |
487 | return ret; | |
488 | else if (ret != len) | |
489 | return -EIO; | |
490 | else | |
491 | return 0; | |
492 | } else { | |
493 | return drv->bdrv_write(bs, sector_num, buf, nb_sectors); | |
494 | } | |
495 | } | |
496 | ||
497 | #if 0 | |
498 | /* not necessary now */ | |
499 | static int bdrv_pread_em(BlockDriverState *bs, int64_t offset, | |
500 | void *buf1, int count1) | |
501 | { | |
502 | uint8_t *buf = buf1; | |
503 | uint8_t tmp_buf[SECTOR_SIZE]; | |
504 | int len, nb_sectors, count; | |
505 | int64_t sector_num; | |
506 | ||
507 | count = count1; | |
508 | /* first read to align to sector start */ | |
509 | len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1); | |
510 | if (len > count) | |
511 | len = count; | |
512 | sector_num = offset >> SECTOR_BITS; | |
513 | if (len > 0) { | |
514 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
515 | return -EIO; | |
516 | memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len); | |
517 | count -= len; | |
518 | if (count == 0) | |
519 | return count1; | |
520 | sector_num++; | |
521 | buf += len; | |
522 | } | |
523 | ||
524 | /* read the sectors "in place" */ | |
525 | nb_sectors = count >> SECTOR_BITS; | |
526 | if (nb_sectors > 0) { | |
527 | if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0) | |
528 | return -EIO; | |
529 | sector_num += nb_sectors; | |
530 | len = nb_sectors << SECTOR_BITS; | |
531 | buf += len; | |
532 | count -= len; | |
533 | } | |
534 | ||
535 | /* add data from the last sector */ | |
536 | if (count > 0) { | |
537 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
538 | return -EIO; | |
539 | memcpy(buf, tmp_buf, count); | |
540 | } | |
541 | return count1; | |
542 | } | |
543 | ||
544 | static int bdrv_pwrite_em(BlockDriverState *bs, int64_t offset, | |
545 | const void *buf1, int count1) | |
546 | { | |
547 | const uint8_t *buf = buf1; | |
548 | uint8_t tmp_buf[SECTOR_SIZE]; | |
549 | int len, nb_sectors, count; | |
550 | int64_t sector_num; | |
551 | ||
552 | count = count1; | |
553 | /* first write to align to sector start */ | |
554 | len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1); | |
555 | if (len > count) | |
556 | len = count; | |
557 | sector_num = offset >> SECTOR_BITS; | |
558 | if (len > 0) { | |
559 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
560 | return -EIO; | |
561 | memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len); | |
562 | if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) | |
563 | return -EIO; | |
564 | count -= len; | |
565 | if (count == 0) | |
566 | return count1; | |
567 | sector_num++; | |
568 | buf += len; | |
569 | } | |
570 | ||
571 | /* write the sectors "in place" */ | |
572 | nb_sectors = count >> SECTOR_BITS; | |
573 | if (nb_sectors > 0) { | |
574 | if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0) | |
575 | return -EIO; | |
576 | sector_num += nb_sectors; | |
577 | len = nb_sectors << SECTOR_BITS; | |
578 | buf += len; | |
579 | count -= len; | |
580 | } | |
581 | ||
582 | /* add data from the last sector */ | |
583 | if (count > 0) { | |
584 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
585 | return -EIO; | |
586 | memcpy(tmp_buf, buf, count); | |
587 | if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) | |
588 | return -EIO; | |
589 | } | |
590 | return count1; | |
591 | } | |
592 | #endif | |
593 | ||
594 | /** | |
595 | * Read with byte offsets (needed only for file protocols) | |
596 | */ | |
597 | int bdrv_pread(BlockDriverState *bs, int64_t offset, | |
598 | void *buf1, int count1) | |
599 | { | |
600 | BlockDriver *drv = bs->drv; | |
601 | ||
602 | if (!drv) | |
603 | return -ENOENT; | |
604 | if (!drv->bdrv_pread) | |
605 | return -ENOTSUP; | |
606 | return drv->bdrv_pread(bs, offset, buf1, count1); | |
607 | } | |
608 | ||
609 | /** | |
610 | * Write with byte offsets (needed only for file protocols) | |
611 | */ | |
612 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, | |
613 | const void *buf1, int count1) | |
614 | { | |
615 | BlockDriver *drv = bs->drv; | |
616 | ||
617 | if (!drv) | |
618 | return -ENOENT; | |
619 | if (!drv->bdrv_pwrite) | |
620 | return -ENOTSUP; | |
621 | return drv->bdrv_pwrite(bs, offset, buf1, count1); | |
622 | } | |
623 | ||
624 | /** | |
625 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
626 | */ | |
627 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
628 | { | |
629 | BlockDriver *drv = bs->drv; | |
630 | if (!drv) | |
631 | return -ENOENT; | |
632 | if (!drv->bdrv_truncate) | |
633 | return -ENOTSUP; | |
634 | return drv->bdrv_truncate(bs, offset); | |
635 | } | |
636 | ||
637 | /** | |
638 | * Length of a file in bytes. Return < 0 if error or unknown. | |
639 | */ | |
640 | int64_t bdrv_getlength(BlockDriverState *bs) | |
641 | { | |
642 | BlockDriver *drv = bs->drv; | |
643 | if (!drv) | |
644 | return -ENOENT; | |
645 | if (!drv->bdrv_getlength) { | |
646 | /* legacy mode */ | |
647 | return bs->total_sectors * SECTOR_SIZE; | |
648 | } | |
649 | return drv->bdrv_getlength(bs); | |
fc01f7e7 FB |
650 | } |
651 | ||
652 | void bdrv_get_geometry(BlockDriverState *bs, int64_t *nb_sectors_ptr) | |
653 | { | |
83f64091 FB |
654 | int64_t size; |
655 | size = bdrv_getlength(bs); | |
656 | if (size < 0) | |
657 | size = 0; | |
658 | *nb_sectors_ptr = size >> SECTOR_BITS; | |
fc01f7e7 | 659 | } |
cf98951b FB |
660 | |
661 | /* force a given boot sector. */ | |
662 | void bdrv_set_boot_sector(BlockDriverState *bs, const uint8_t *data, int size) | |
663 | { | |
664 | bs->boot_sector_enabled = 1; | |
665 | if (size > 512) | |
666 | size = 512; | |
667 | memcpy(bs->boot_sector_data, data, size); | |
668 | memset(bs->boot_sector_data + size, 0, 512 - size); | |
669 | } | |
b338082b FB |
670 | |
671 | void bdrv_set_geometry_hint(BlockDriverState *bs, | |
672 | int cyls, int heads, int secs) | |
673 | { | |
674 | bs->cyls = cyls; | |
675 | bs->heads = heads; | |
676 | bs->secs = secs; | |
677 | } | |
678 | ||
679 | void bdrv_set_type_hint(BlockDriverState *bs, int type) | |
680 | { | |
681 | bs->type = type; | |
682 | bs->removable = ((type == BDRV_TYPE_CDROM || | |
683 | type == BDRV_TYPE_FLOPPY)); | |
684 | } | |
685 | ||
46d4767d FB |
686 | void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
687 | { | |
688 | bs->translation = translation; | |
689 | } | |
690 | ||
b338082b FB |
691 | void bdrv_get_geometry_hint(BlockDriverState *bs, |
692 | int *pcyls, int *pheads, int *psecs) | |
693 | { | |
694 | *pcyls = bs->cyls; | |
695 | *pheads = bs->heads; | |
696 | *psecs = bs->secs; | |
697 | } | |
698 | ||
699 | int bdrv_get_type_hint(BlockDriverState *bs) | |
700 | { | |
701 | return bs->type; | |
702 | } | |
703 | ||
46d4767d FB |
704 | int bdrv_get_translation_hint(BlockDriverState *bs) |
705 | { | |
706 | return bs->translation; | |
707 | } | |
708 | ||
b338082b FB |
709 | int bdrv_is_removable(BlockDriverState *bs) |
710 | { | |
711 | return bs->removable; | |
712 | } | |
713 | ||
714 | int bdrv_is_read_only(BlockDriverState *bs) | |
715 | { | |
716 | return bs->read_only; | |
717 | } | |
718 | ||
719 | int bdrv_is_inserted(BlockDriverState *bs) | |
720 | { | |
721 | return bs->inserted; | |
722 | } | |
723 | ||
724 | int bdrv_is_locked(BlockDriverState *bs) | |
725 | { | |
726 | return bs->locked; | |
727 | } | |
728 | ||
729 | void bdrv_set_locked(BlockDriverState *bs, int locked) | |
730 | { | |
731 | bs->locked = locked; | |
732 | } | |
733 | ||
734 | void bdrv_set_change_cb(BlockDriverState *bs, | |
735 | void (*change_cb)(void *opaque), void *opaque) | |
736 | { | |
737 | bs->change_cb = change_cb; | |
738 | bs->change_opaque = opaque; | |
739 | } | |
740 | ||
ea2384d3 FB |
741 | int bdrv_is_encrypted(BlockDriverState *bs) |
742 | { | |
743 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
744 | return 1; | |
745 | return bs->encrypted; | |
746 | } | |
747 | ||
748 | int bdrv_set_key(BlockDriverState *bs, const char *key) | |
749 | { | |
750 | int ret; | |
751 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
752 | ret = bdrv_set_key(bs->backing_hd, key); | |
753 | if (ret < 0) | |
754 | return ret; | |
755 | if (!bs->encrypted) | |
756 | return 0; | |
757 | } | |
758 | if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key) | |
759 | return -1; | |
760 | return bs->drv->bdrv_set_key(bs, key); | |
761 | } | |
762 | ||
763 | void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) | |
764 | { | |
765 | if (!bs->inserted || !bs->drv) { | |
766 | buf[0] = '\0'; | |
767 | } else { | |
768 | pstrcpy(buf, buf_size, bs->drv->format_name); | |
769 | } | |
770 | } | |
771 | ||
772 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), | |
773 | void *opaque) | |
774 | { | |
775 | BlockDriver *drv; | |
776 | ||
777 | for (drv = first_drv; drv != NULL; drv = drv->next) { | |
778 | it(opaque, drv->format_name); | |
779 | } | |
780 | } | |
781 | ||
b338082b FB |
782 | BlockDriverState *bdrv_find(const char *name) |
783 | { | |
784 | BlockDriverState *bs; | |
785 | ||
786 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
787 | if (!strcmp(name, bs->device_name)) | |
788 | return bs; | |
789 | } | |
790 | return NULL; | |
791 | } | |
792 | ||
81d0912d FB |
793 | void bdrv_iterate(void (*it)(void *opaque, const char *name), void *opaque) |
794 | { | |
795 | BlockDriverState *bs; | |
796 | ||
797 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
798 | it(opaque, bs->device_name); | |
799 | } | |
800 | } | |
801 | ||
ea2384d3 FB |
802 | const char *bdrv_get_device_name(BlockDriverState *bs) |
803 | { | |
804 | return bs->device_name; | |
805 | } | |
806 | ||
7a6cba61 PB |
807 | void bdrv_flush(BlockDriverState *bs) |
808 | { | |
809 | if (bs->drv->bdrv_flush) | |
810 | bs->drv->bdrv_flush(bs); | |
811 | if (bs->backing_hd) | |
812 | bdrv_flush(bs->backing_hd); | |
813 | } | |
814 | ||
b338082b FB |
815 | void bdrv_info(void) |
816 | { | |
817 | BlockDriverState *bs; | |
818 | ||
819 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
820 | term_printf("%s:", bs->device_name); | |
821 | term_printf(" type="); | |
822 | switch(bs->type) { | |
823 | case BDRV_TYPE_HD: | |
824 | term_printf("hd"); | |
825 | break; | |
826 | case BDRV_TYPE_CDROM: | |
827 | term_printf("cdrom"); | |
828 | break; | |
829 | case BDRV_TYPE_FLOPPY: | |
830 | term_printf("floppy"); | |
831 | break; | |
832 | } | |
833 | term_printf(" removable=%d", bs->removable); | |
834 | if (bs->removable) { | |
835 | term_printf(" locked=%d", bs->locked); | |
836 | } | |
837 | if (bs->inserted) { | |
838 | term_printf(" file=%s", bs->filename); | |
ea2384d3 FB |
839 | if (bs->backing_file[0] != '\0') |
840 | term_printf(" backing_file=%s", bs->backing_file); | |
b338082b | 841 | term_printf(" ro=%d", bs->read_only); |
ea2384d3 FB |
842 | term_printf(" drv=%s", bs->drv->format_name); |
843 | if (bs->encrypted) | |
844 | term_printf(" encrypted"); | |
b338082b FB |
845 | } else { |
846 | term_printf(" [not inserted]"); | |
847 | } | |
848 | term_printf("\n"); | |
849 | } | |
850 | } | |
ea2384d3 | 851 | |
83f64091 FB |
852 | void bdrv_get_backing_filename(BlockDriverState *bs, |
853 | char *filename, int filename_size) | |
854 | { | |
855 | if (!bs->backing_hd) { | |
856 | pstrcpy(filename, filename_size, ""); | |
857 | } else { | |
858 | pstrcpy(filename, filename_size, bs->backing_file); | |
859 | } | |
860 | } | |
861 | ||
862 | ||
ea2384d3 | 863 | /**************************************************************/ |
83f64091 | 864 | /* async I/Os */ |
ea2384d3 | 865 | |
83f64091 FB |
866 | BlockDriverAIOCB *bdrv_aio_new(BlockDriverState *bs) |
867 | { | |
868 | BlockDriver *drv = bs->drv; | |
869 | BlockDriverAIOCB *acb; | |
870 | acb = qemu_mallocz(sizeof(BlockDriverAIOCB)); | |
871 | if (!acb) | |
872 | return NULL; | |
873 | ||
874 | acb->bs = bs; | |
875 | if (drv->bdrv_aio_new(acb) < 0) { | |
876 | qemu_free(acb); | |
877 | return NULL; | |
878 | } | |
879 | return acb; | |
880 | } | |
ea2384d3 | 881 | |
83f64091 FB |
882 | int bdrv_aio_read(BlockDriverAIOCB *acb, int64_t sector_num, |
883 | uint8_t *buf, int nb_sectors, | |
884 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 885 | { |
83f64091 FB |
886 | BlockDriverState *bs = acb->bs; |
887 | BlockDriver *drv = bs->drv; | |
888 | ||
889 | if (!bs->inserted) | |
890 | return -1; | |
891 | ||
892 | /* XXX: we assume that nb_sectors == 0 is suppored by the async read */ | |
893 | if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { | |
894 | memcpy(buf, bs->boot_sector_data, 512); | |
895 | sector_num++; | |
896 | nb_sectors--; | |
897 | buf += 512; | |
898 | } | |
899 | ||
900 | acb->cb = cb; | |
901 | acb->cb_opaque = opaque; | |
902 | return drv->bdrv_aio_read(acb, sector_num, buf, nb_sectors); | |
ea2384d3 FB |
903 | } |
904 | ||
83f64091 FB |
905 | int bdrv_aio_write(BlockDriverAIOCB *acb, int64_t sector_num, |
906 | const uint8_t *buf, int nb_sectors, | |
907 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 908 | { |
83f64091 FB |
909 | BlockDriverState *bs = acb->bs; |
910 | BlockDriver *drv = bs->drv; | |
ea2384d3 | 911 | |
83f64091 | 912 | if (!bs->inserted) |
ea2384d3 | 913 | return -1; |
83f64091 FB |
914 | if (bs->read_only) |
915 | return -1; | |
916 | if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { | |
917 | memcpy(bs->boot_sector_data, buf, 512); | |
ea2384d3 | 918 | } |
83f64091 FB |
919 | |
920 | acb->cb = cb; | |
921 | acb->cb_opaque = opaque; | |
922 | return drv->bdrv_aio_write(acb, sector_num, buf, nb_sectors); | |
923 | } | |
924 | ||
925 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) | |
7674e7bf | 926 | { |
83f64091 FB |
927 | BlockDriverState *bs = acb->bs; |
928 | BlockDriver *drv = bs->drv; | |
929 | ||
930 | drv->bdrv_aio_cancel(acb); | |
7674e7bf | 931 | } |
83f64091 FB |
932 | |
933 | void bdrv_aio_delete(BlockDriverAIOCB *acb) | |
934 | { | |
935 | BlockDriverState *bs = acb->bs; | |
936 | BlockDriver *drv = bs->drv; | |
937 | ||
938 | drv->bdrv_aio_delete(acb); | |
939 | qemu_free(acb); | |
940 | } | |
941 | ||
942 | /**************************************************************/ | |
943 | /* async block device emulation */ | |
944 | ||
945 | #ifdef QEMU_TOOL | |
946 | static int bdrv_aio_new_em(BlockDriverAIOCB *acb) | |
947 | { | |
ea2384d3 FB |
948 | return 0; |
949 | } | |
950 | ||
83f64091 | 951 | static int bdrv_aio_read_em(BlockDriverAIOCB *acb, int64_t sector_num, |
ea2384d3 FB |
952 | uint8_t *buf, int nb_sectors) |
953 | { | |
ea2384d3 | 954 | int ret; |
83f64091 FB |
955 | ret = bdrv_read(acb->bs, sector_num, buf, nb_sectors); |
956 | acb->cb(acb->cb_opaque, ret); | |
ea2384d3 FB |
957 | return 0; |
958 | } | |
959 | ||
83f64091 | 960 | static int bdrv_aio_write_em(BlockDriverAIOCB *acb, int64_t sector_num, |
ea2384d3 FB |
961 | const uint8_t *buf, int nb_sectors) |
962 | { | |
ea2384d3 | 963 | int ret; |
83f64091 FB |
964 | ret = bdrv_write(acb->bs, sector_num, buf, nb_sectors); |
965 | acb->cb(acb->cb_opaque, ret); | |
ea2384d3 FB |
966 | return 0; |
967 | } | |
968 | ||
83f64091 | 969 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb) |
ea2384d3 | 970 | { |
ea2384d3 FB |
971 | } |
972 | ||
83f64091 | 973 | static void bdrv_aio_delete_em(BlockDriverAIOCB *acb) |
beac80cd | 974 | { |
83f64091 FB |
975 | } |
976 | #else | |
977 | typedef struct BlockDriverAIOCBSync { | |
978 | QEMUBH *bh; | |
979 | int ret; | |
980 | } BlockDriverAIOCBSync; | |
beac80cd | 981 | |
83f64091 FB |
982 | static void bdrv_aio_bh_cb(void *opaque) |
983 | { | |
984 | BlockDriverAIOCB *acb = opaque; | |
985 | BlockDriverAIOCBSync *acb1 = acb->opaque; | |
986 | acb->cb(acb->cb_opaque, acb1->ret); | |
987 | } | |
beac80cd | 988 | |
83f64091 FB |
989 | static int bdrv_aio_new_em(BlockDriverAIOCB *acb) |
990 | { | |
991 | BlockDriverAIOCBSync *acb1; | |
beac80cd | 992 | |
83f64091 FB |
993 | acb1 = qemu_mallocz(sizeof(BlockDriverAIOCBSync)); |
994 | if (!acb1) | |
995 | return -1; | |
996 | acb->opaque = acb1; | |
997 | acb1->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
998 | return 0; | |
999 | } | |
beac80cd | 1000 | |
83f64091 FB |
1001 | static int bdrv_aio_read_em(BlockDriverAIOCB *acb, int64_t sector_num, |
1002 | uint8_t *buf, int nb_sectors) | |
1003 | { | |
1004 | BlockDriverAIOCBSync *acb1 = acb->opaque; | |
1005 | int ret; | |
1006 | ||
1007 | ret = bdrv_read(acb->bs, sector_num, buf, nb_sectors); | |
1008 | acb1->ret = ret; | |
1009 | qemu_bh_schedule(acb1->bh); | |
1010 | return 0; | |
beac80cd FB |
1011 | } |
1012 | ||
83f64091 FB |
1013 | static int bdrv_aio_write_em(BlockDriverAIOCB *acb, int64_t sector_num, |
1014 | const uint8_t *buf, int nb_sectors) | |
beac80cd | 1015 | { |
83f64091 FB |
1016 | BlockDriverAIOCBSync *acb1 = acb->opaque; |
1017 | int ret; | |
1018 | ||
1019 | ret = bdrv_write(acb->bs, sector_num, buf, nb_sectors); | |
1020 | acb1->ret = ret; | |
1021 | qemu_bh_schedule(acb1->bh); | |
1022 | return 0; | |
beac80cd | 1023 | } |
83f64091 FB |
1024 | |
1025 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb) | |
beac80cd | 1026 | { |
83f64091 FB |
1027 | BlockDriverAIOCBSync *acb1 = acb->opaque; |
1028 | qemu_bh_cancel(acb1->bh); | |
beac80cd | 1029 | } |
beac80cd | 1030 | |
83f64091 | 1031 | static void bdrv_aio_delete_em(BlockDriverAIOCB *acb) |
ea2384d3 | 1032 | { |
83f64091 FB |
1033 | BlockDriverAIOCBSync *acb1 = acb->opaque; |
1034 | qemu_bh_delete(acb1->bh); | |
1035 | } | |
1036 | #endif /* !QEMU_TOOL */ | |
ea2384d3 | 1037 | |
83f64091 FB |
1038 | /**************************************************************/ |
1039 | /* sync block device emulation */ | |
ea2384d3 | 1040 | |
83f64091 FB |
1041 | static void bdrv_rw_em_cb(void *opaque, int ret) |
1042 | { | |
1043 | *(int *)opaque = ret; | |
ea2384d3 FB |
1044 | } |
1045 | ||
83f64091 FB |
1046 | #define NOT_DONE 0x7fffffff |
1047 | ||
1048 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, | |
1049 | uint8_t *buf, int nb_sectors) | |
7a6cba61 | 1050 | { |
83f64091 FB |
1051 | int async_ret, ret; |
1052 | ||
1053 | if (!bs->sync_aiocb) { | |
1054 | bs->sync_aiocb = bdrv_aio_new(bs); | |
1055 | if (!bs->sync_aiocb) | |
1056 | return -1; | |
1057 | } | |
1058 | async_ret = NOT_DONE; | |
1059 | qemu_aio_wait_start(); | |
1060 | ret = bdrv_aio_read(bs->sync_aiocb, sector_num, buf, nb_sectors, | |
1061 | bdrv_rw_em_cb, &async_ret); | |
1062 | if (ret < 0) { | |
1063 | qemu_aio_wait_end(); | |
1064 | return ret; | |
1065 | } | |
1066 | while (async_ret == NOT_DONE) { | |
1067 | qemu_aio_wait(); | |
1068 | } | |
1069 | qemu_aio_wait_end(); | |
1070 | return async_ret; | |
7a6cba61 PB |
1071 | } |
1072 | ||
83f64091 FB |
1073 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
1074 | const uint8_t *buf, int nb_sectors) | |
1075 | { | |
1076 | int async_ret, ret; | |
1077 | ||
1078 | if (!bs->sync_aiocb) { | |
1079 | bs->sync_aiocb = bdrv_aio_new(bs); | |
1080 | if (!bs->sync_aiocb) | |
1081 | return -1; | |
1082 | } | |
1083 | async_ret = NOT_DONE; | |
1084 | qemu_aio_wait_start(); | |
1085 | ret = bdrv_aio_write(bs->sync_aiocb, sector_num, buf, nb_sectors, | |
1086 | bdrv_rw_em_cb, &async_ret); | |
1087 | if (ret < 0) { | |
1088 | qemu_aio_wait_end(); | |
1089 | return ret; | |
1090 | } | |
1091 | while (async_ret == NOT_DONE) { | |
1092 | qemu_aio_wait(); | |
1093 | } | |
1094 | qemu_aio_wait_end(); | |
1095 | return async_ret; | |
1096 | } | |
ea2384d3 FB |
1097 | |
1098 | void bdrv_init(void) | |
1099 | { | |
1100 | bdrv_register(&bdrv_raw); | |
1101 | #ifndef _WIN32 | |
1102 | bdrv_register(&bdrv_cow); | |
1103 | #endif | |
1104 | bdrv_register(&bdrv_qcow); | |
1105 | bdrv_register(&bdrv_vmdk); | |
3c56521b | 1106 | bdrv_register(&bdrv_cloop); |
585d0ed9 | 1107 | bdrv_register(&bdrv_dmg); |
a8753c34 | 1108 | bdrv_register(&bdrv_bochs); |
6a0f9e82 | 1109 | bdrv_register(&bdrv_vpc); |
712e7874 | 1110 | bdrv_register(&bdrv_vvfat); |
ea2384d3 | 1111 | } |