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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 | ||
90765429 FB |
38 | typedef struct BlockDriverAIOCBSync { |
39 | BlockDriverAIOCB common; | |
40 | QEMUBH *bh; | |
41 | int ret; | |
42 | } BlockDriverAIOCBSync; | |
43 | ||
ce1a14dc PB |
44 | static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs, |
45 | int64_t sector_num, uint8_t *buf, int nb_sectors, | |
46 | BlockDriverCompletionFunc *cb, void *opaque); | |
47 | static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs, | |
48 | int64_t sector_num, const uint8_t *buf, int nb_sectors, | |
49 | BlockDriverCompletionFunc *cb, void *opaque); | |
83f64091 | 50 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb); |
83f64091 FB |
51 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
52 | uint8_t *buf, int nb_sectors); | |
53 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, | |
54 | const uint8_t *buf, int nb_sectors); | |
ec530c81 | 55 | |
b338082b | 56 | static BlockDriverState *bdrv_first; |
ea2384d3 FB |
57 | static BlockDriver *first_drv; |
58 | ||
83f64091 FB |
59 | #ifdef _WIN32 |
60 | #define PATH_SEP '\\' | |
61 | #else | |
62 | #define PATH_SEP '/' | |
63 | #endif | |
3b0d4f61 | 64 | |
83f64091 | 65 | int path_is_absolute(const char *path) |
3b0d4f61 | 66 | { |
83f64091 FB |
67 | const char *p; |
68 | p = strchr(path, ':'); | |
69 | if (p) | |
70 | p++; | |
71 | else | |
72 | p = path; | |
73 | return (*p == PATH_SEP); | |
3b0d4f61 FB |
74 | } |
75 | ||
83f64091 FB |
76 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
77 | path to it by considering it is relative to base_path. URL are | |
78 | supported. */ | |
79 | void path_combine(char *dest, int dest_size, | |
80 | const char *base_path, | |
81 | const char *filename) | |
3b0d4f61 | 82 | { |
83f64091 FB |
83 | const char *p, *p1; |
84 | int len; | |
85 | ||
86 | if (dest_size <= 0) | |
87 | return; | |
88 | if (path_is_absolute(filename)) { | |
89 | pstrcpy(dest, dest_size, filename); | |
90 | } else { | |
91 | p = strchr(base_path, ':'); | |
92 | if (p) | |
93 | p++; | |
94 | else | |
95 | p = base_path; | |
96 | p1 = strrchr(base_path, PATH_SEP); | |
97 | if (p1) | |
98 | p1++; | |
99 | else | |
100 | p1 = base_path; | |
101 | if (p1 > p) | |
102 | p = p1; | |
103 | len = p - base_path; | |
104 | if (len > dest_size - 1) | |
105 | len = dest_size - 1; | |
106 | memcpy(dest, base_path, len); | |
107 | dest[len] = '\0'; | |
108 | pstrcat(dest, dest_size, filename); | |
3b0d4f61 | 109 | } |
3b0d4f61 FB |
110 | } |
111 | ||
3b0d4f61 | 112 | |
ea2384d3 FB |
113 | void bdrv_register(BlockDriver *bdrv) |
114 | { | |
ce1a14dc | 115 | if (!bdrv->bdrv_aio_read) { |
83f64091 | 116 | /* add AIO emulation layer */ |
83f64091 FB |
117 | bdrv->bdrv_aio_read = bdrv_aio_read_em; |
118 | bdrv->bdrv_aio_write = bdrv_aio_write_em; | |
119 | bdrv->bdrv_aio_cancel = bdrv_aio_cancel_em; | |
90765429 | 120 | bdrv->aiocb_size = sizeof(BlockDriverAIOCBSync); |
83f64091 FB |
121 | } else if (!bdrv->bdrv_read && !bdrv->bdrv_pread) { |
122 | /* add synchronous IO emulation layer */ | |
123 | bdrv->bdrv_read = bdrv_read_em; | |
124 | bdrv->bdrv_write = bdrv_write_em; | |
125 | } | |
ea2384d3 FB |
126 | bdrv->next = first_drv; |
127 | first_drv = bdrv; | |
128 | } | |
b338082b FB |
129 | |
130 | /* create a new block device (by default it is empty) */ | |
131 | BlockDriverState *bdrv_new(const char *device_name) | |
132 | { | |
133 | BlockDriverState **pbs, *bs; | |
134 | ||
135 | bs = qemu_mallocz(sizeof(BlockDriverState)); | |
136 | if(!bs) | |
137 | return NULL; | |
138 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); | |
ea2384d3 FB |
139 | if (device_name[0] != '\0') { |
140 | /* insert at the end */ | |
141 | pbs = &bdrv_first; | |
142 | while (*pbs != NULL) | |
143 | pbs = &(*pbs)->next; | |
144 | *pbs = bs; | |
145 | } | |
b338082b FB |
146 | return bs; |
147 | } | |
148 | ||
ea2384d3 FB |
149 | BlockDriver *bdrv_find_format(const char *format_name) |
150 | { | |
151 | BlockDriver *drv1; | |
152 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { | |
153 | if (!strcmp(drv1->format_name, format_name)) | |
154 | return drv1; | |
155 | } | |
156 | return NULL; | |
157 | } | |
158 | ||
159 | int bdrv_create(BlockDriver *drv, | |
160 | const char *filename, int64_t size_in_sectors, | |
161 | const char *backing_file, int flags) | |
162 | { | |
163 | if (!drv->bdrv_create) | |
164 | return -ENOTSUP; | |
165 | return drv->bdrv_create(filename, size_in_sectors, backing_file, flags); | |
166 | } | |
167 | ||
d5249393 | 168 | #ifdef _WIN32 |
95389c86 | 169 | void get_tmp_filename(char *filename, int size) |
d5249393 | 170 | { |
83f64091 | 171 | tmpnam(filename); |
d5249393 FB |
172 | } |
173 | #else | |
95389c86 | 174 | void get_tmp_filename(char *filename, int size) |
fc01f7e7 | 175 | { |
67b915a5 | 176 | int fd; |
d5249393 | 177 | /* XXX: race condition possible */ |
ea2384d3 FB |
178 | pstrcpy(filename, size, "/tmp/vl.XXXXXX"); |
179 | fd = mkstemp(filename); | |
180 | close(fd); | |
181 | } | |
d5249393 | 182 | #endif |
fc01f7e7 | 183 | |
19cb3738 | 184 | #ifdef _WIN32 |
f45512fe FB |
185 | static int is_windows_drive_prefix(const char *filename) |
186 | { | |
187 | return (((filename[0] >= 'a' && filename[0] <= 'z') || | |
188 | (filename[0] >= 'A' && filename[0] <= 'Z')) && | |
189 | filename[1] == ':'); | |
190 | } | |
191 | ||
19cb3738 FB |
192 | static int is_windows_drive(const char *filename) |
193 | { | |
f45512fe FB |
194 | if (is_windows_drive_prefix(filename) && |
195 | filename[2] == '\0') | |
19cb3738 FB |
196 | return 1; |
197 | if (strstart(filename, "\\\\.\\", NULL) || | |
198 | strstart(filename, "//./", NULL)) | |
199 | return 1; | |
200 | return 0; | |
201 | } | |
202 | #endif | |
203 | ||
83f64091 FB |
204 | static BlockDriver *find_protocol(const char *filename) |
205 | { | |
206 | BlockDriver *drv1; | |
207 | char protocol[128]; | |
208 | int len; | |
209 | const char *p; | |
19cb3738 FB |
210 | |
211 | #ifdef _WIN32 | |
f45512fe FB |
212 | if (is_windows_drive(filename) || |
213 | is_windows_drive_prefix(filename)) | |
19cb3738 FB |
214 | return &bdrv_raw; |
215 | #endif | |
83f64091 FB |
216 | p = strchr(filename, ':'); |
217 | if (!p) | |
218 | return &bdrv_raw; | |
219 | len = p - filename; | |
220 | if (len > sizeof(protocol) - 1) | |
221 | len = sizeof(protocol) - 1; | |
83f64091 FB |
222 | memcpy(protocol, filename, len); |
223 | protocol[len] = '\0'; | |
224 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { | |
225 | if (drv1->protocol_name && | |
226 | !strcmp(drv1->protocol_name, protocol)) | |
227 | return drv1; | |
228 | } | |
229 | return NULL; | |
230 | } | |
231 | ||
7674e7bf FB |
232 | /* XXX: force raw format if block or character device ? It would |
233 | simplify the BSD case */ | |
ea2384d3 FB |
234 | static BlockDriver *find_image_format(const char *filename) |
235 | { | |
83f64091 | 236 | int ret, score, score_max; |
ea2384d3 | 237 | BlockDriver *drv1, *drv; |
83f64091 FB |
238 | uint8_t buf[2048]; |
239 | BlockDriverState *bs; | |
ea2384d3 | 240 | |
19cb3738 FB |
241 | /* detect host devices. By convention, /dev/cdrom[N] is always |
242 | recognized as a host CDROM */ | |
243 | if (strstart(filename, "/dev/cdrom", NULL)) | |
244 | return &bdrv_host_device; | |
245 | #ifdef _WIN32 | |
246 | if (is_windows_drive(filename)) | |
247 | return &bdrv_host_device; | |
248 | #else | |
249 | { | |
250 | struct stat st; | |
251 | if (stat(filename, &st) >= 0 && | |
252 | (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) { | |
253 | return &bdrv_host_device; | |
254 | } | |
255 | } | |
256 | #endif | |
257 | ||
83f64091 | 258 | drv = find_protocol(filename); |
19cb3738 | 259 | /* no need to test disk image formats for vvfat */ |
83f64091 FB |
260 | if (drv == &bdrv_vvfat) |
261 | return drv; | |
19cb3738 | 262 | |
83f64091 FB |
263 | ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY); |
264 | if (ret < 0) | |
265 | return NULL; | |
266 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); | |
267 | bdrv_delete(bs); | |
268 | if (ret < 0) { | |
269 | return NULL; | |
270 | } | |
271 | ||
ea2384d3 FB |
272 | score_max = 0; |
273 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { | |
83f64091 FB |
274 | if (drv1->bdrv_probe) { |
275 | score = drv1->bdrv_probe(buf, ret, filename); | |
276 | if (score > score_max) { | |
277 | score_max = score; | |
278 | drv = drv1; | |
279 | } | |
0849bf08 | 280 | } |
fc01f7e7 | 281 | } |
ea2384d3 FB |
282 | return drv; |
283 | } | |
284 | ||
83f64091 | 285 | int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
ea2384d3 | 286 | { |
83f64091 FB |
287 | BlockDriverState *bs; |
288 | int ret; | |
289 | ||
290 | bs = bdrv_new(""); | |
291 | if (!bs) | |
292 | return -ENOMEM; | |
293 | ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL); | |
294 | if (ret < 0) { | |
295 | bdrv_delete(bs); | |
296 | return ret; | |
3b0d4f61 | 297 | } |
83f64091 FB |
298 | *pbs = bs; |
299 | return 0; | |
300 | } | |
301 | ||
302 | int bdrv_open(BlockDriverState *bs, const char *filename, int flags) | |
303 | { | |
304 | return bdrv_open2(bs, filename, flags, NULL); | |
ea2384d3 FB |
305 | } |
306 | ||
83f64091 | 307 | int bdrv_open2(BlockDriverState *bs, const char *filename, int flags, |
ea2384d3 FB |
308 | BlockDriver *drv) |
309 | { | |
83f64091 | 310 | int ret, open_flags; |
ea2384d3 | 311 | char tmp_filename[1024]; |
83f64091 | 312 | char backing_filename[1024]; |
ea2384d3 FB |
313 | |
314 | bs->read_only = 0; | |
315 | bs->is_temporary = 0; | |
316 | bs->encrypted = 0; | |
712e7874 | 317 | |
83f64091 | 318 | if (flags & BDRV_O_SNAPSHOT) { |
ea2384d3 FB |
319 | BlockDriverState *bs1; |
320 | int64_t total_size; | |
321 | ||
322 | /* if snapshot, we create a temporary backing file and open it | |
323 | instead of opening 'filename' directly */ | |
33e3963e | 324 | |
ea2384d3 FB |
325 | /* if there is a backing file, use it */ |
326 | bs1 = bdrv_new(""); | |
327 | if (!bs1) { | |
83f64091 | 328 | return -ENOMEM; |
ea2384d3 FB |
329 | } |
330 | if (bdrv_open(bs1, filename, 0) < 0) { | |
331 | bdrv_delete(bs1); | |
332 | return -1; | |
333 | } | |
83f64091 | 334 | total_size = bdrv_getlength(bs1) >> SECTOR_BITS; |
ea2384d3 FB |
335 | bdrv_delete(bs1); |
336 | ||
337 | get_tmp_filename(tmp_filename, sizeof(tmp_filename)); | |
a817d936 | 338 | realpath(filename, backing_filename); |
d15a771d | 339 | if (bdrv_create(&bdrv_qcow2, tmp_filename, |
a817d936 | 340 | total_size, backing_filename, 0) < 0) { |
ea2384d3 FB |
341 | return -1; |
342 | } | |
343 | filename = tmp_filename; | |
344 | bs->is_temporary = 1; | |
345 | } | |
712e7874 | 346 | |
ea2384d3 | 347 | pstrcpy(bs->filename, sizeof(bs->filename), filename); |
83f64091 FB |
348 | if (flags & BDRV_O_FILE) { |
349 | drv = find_protocol(filename); | |
ea2384d3 | 350 | if (!drv) |
83f64091 FB |
351 | return -ENOENT; |
352 | } else { | |
353 | if (!drv) { | |
354 | drv = find_image_format(filename); | |
355 | if (!drv) | |
356 | return -1; | |
357 | } | |
ea2384d3 FB |
358 | } |
359 | bs->drv = drv; | |
360 | bs->opaque = qemu_mallocz(drv->instance_size); | |
361 | if (bs->opaque == NULL && drv->instance_size > 0) | |
362 | return -1; | |
83f64091 FB |
363 | /* Note: for compatibility, we open disk image files as RDWR, and |
364 | RDONLY as fallback */ | |
365 | if (!(flags & BDRV_O_FILE)) | |
366 | open_flags = BDRV_O_RDWR; | |
367 | else | |
368 | open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT); | |
369 | ret = drv->bdrv_open(bs, filename, open_flags); | |
370 | if (ret == -EACCES && !(flags & BDRV_O_FILE)) { | |
371 | ret = drv->bdrv_open(bs, filename, BDRV_O_RDONLY); | |
372 | bs->read_only = 1; | |
373 | } | |
ea2384d3 FB |
374 | if (ret < 0) { |
375 | qemu_free(bs->opaque); | |
6b21b973 FB |
376 | bs->opaque = NULL; |
377 | bs->drv = NULL; | |
83f64091 | 378 | return ret; |
33e3963e | 379 | } |
d15a771d FB |
380 | if (drv->bdrv_getlength) { |
381 | bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; | |
382 | } | |
67b915a5 | 383 | #ifndef _WIN32 |
ea2384d3 FB |
384 | if (bs->is_temporary) { |
385 | unlink(filename); | |
386 | } | |
387 | #endif | |
83f64091 | 388 | if (bs->backing_file[0] != '\0') { |
ea2384d3 FB |
389 | /* if there is a backing file, use it */ |
390 | bs->backing_hd = bdrv_new(""); | |
391 | if (!bs->backing_hd) { | |
392 | fail: | |
393 | bdrv_close(bs); | |
6b21b973 | 394 | return -ENOMEM; |
33e3963e | 395 | } |
83f64091 FB |
396 | path_combine(backing_filename, sizeof(backing_filename), |
397 | filename, bs->backing_file); | |
398 | if (bdrv_open(bs->backing_hd, backing_filename, 0) < 0) | |
33e3963e | 399 | goto fail; |
33e3963e FB |
400 | } |
401 | ||
b338082b | 402 | /* call the change callback */ |
19cb3738 | 403 | bs->media_changed = 1; |
b338082b FB |
404 | if (bs->change_cb) |
405 | bs->change_cb(bs->change_opaque); | |
406 | ||
407 | return 0; | |
fc01f7e7 FB |
408 | } |
409 | ||
410 | void bdrv_close(BlockDriverState *bs) | |
411 | { | |
19cb3738 | 412 | if (bs->drv) { |
ea2384d3 FB |
413 | if (bs->backing_hd) |
414 | bdrv_delete(bs->backing_hd); | |
415 | bs->drv->bdrv_close(bs); | |
416 | qemu_free(bs->opaque); | |
417 | #ifdef _WIN32 | |
418 | if (bs->is_temporary) { | |
419 | unlink(bs->filename); | |
420 | } | |
67b915a5 | 421 | #endif |
ea2384d3 FB |
422 | bs->opaque = NULL; |
423 | bs->drv = NULL; | |
b338082b FB |
424 | |
425 | /* call the change callback */ | |
19cb3738 | 426 | bs->media_changed = 1; |
b338082b FB |
427 | if (bs->change_cb) |
428 | bs->change_cb(bs->change_opaque); | |
429 | } | |
430 | } | |
431 | ||
432 | void bdrv_delete(BlockDriverState *bs) | |
433 | { | |
ea2384d3 | 434 | /* XXX: remove the driver list */ |
b338082b FB |
435 | bdrv_close(bs); |
436 | qemu_free(bs); | |
fc01f7e7 FB |
437 | } |
438 | ||
33e3963e FB |
439 | /* commit COW file into the raw image */ |
440 | int bdrv_commit(BlockDriverState *bs) | |
441 | { | |
19cb3738 | 442 | BlockDriver *drv = bs->drv; |
83f64091 | 443 | int64_t i, total_sectors; |
ea2384d3 FB |
444 | int n, j; |
445 | unsigned char sector[512]; | |
33e3963e | 446 | |
19cb3738 FB |
447 | if (!drv) |
448 | return -ENOMEDIUM; | |
33e3963e FB |
449 | |
450 | if (bs->read_only) { | |
ea2384d3 | 451 | return -EACCES; |
33e3963e FB |
452 | } |
453 | ||
ea2384d3 FB |
454 | if (!bs->backing_hd) { |
455 | return -ENOTSUP; | |
456 | } | |
33e3963e | 457 | |
83f64091 FB |
458 | total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
459 | for (i = 0; i < total_sectors;) { | |
19cb3738 | 460 | if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { |
ea2384d3 FB |
461 | for(j = 0; j < n; j++) { |
462 | if (bdrv_read(bs, i, sector, 1) != 0) { | |
463 | return -EIO; | |
464 | } | |
465 | ||
466 | if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { | |
467 | return -EIO; | |
468 | } | |
469 | i++; | |
33e3963e | 470 | } |
ea2384d3 FB |
471 | } else { |
472 | i += n; | |
473 | } | |
33e3963e | 474 | } |
95389c86 | 475 | |
19cb3738 FB |
476 | if (drv->bdrv_make_empty) |
477 | return drv->bdrv_make_empty(bs); | |
95389c86 | 478 | |
33e3963e FB |
479 | return 0; |
480 | } | |
481 | ||
19cb3738 | 482 | /* return < 0 if error. See bdrv_write() for the return codes */ |
fc01f7e7 FB |
483 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, |
484 | uint8_t *buf, int nb_sectors) | |
485 | { | |
ea2384d3 FB |
486 | BlockDriver *drv = bs->drv; |
487 | ||
19cb3738 FB |
488 | if (!drv) |
489 | return -ENOMEDIUM; | |
b338082b | 490 | |
83f64091 | 491 | if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { |
cf98951b | 492 | memcpy(buf, bs->boot_sector_data, 512); |
83f64091 FB |
493 | sector_num++; |
494 | nb_sectors--; | |
495 | buf += 512; | |
496 | if (nb_sectors == 0) | |
497 | return 0; | |
498 | } | |
499 | if (drv->bdrv_pread) { | |
500 | int ret, len; | |
501 | len = nb_sectors * 512; | |
502 | ret = drv->bdrv_pread(bs, sector_num * 512, buf, len); | |
503 | if (ret < 0) | |
504 | return ret; | |
505 | else if (ret != len) | |
19cb3738 | 506 | return -EINVAL; |
83f64091 FB |
507 | else |
508 | return 0; | |
509 | } else { | |
510 | return drv->bdrv_read(bs, sector_num, buf, nb_sectors); | |
33e3963e | 511 | } |
fc01f7e7 FB |
512 | } |
513 | ||
19cb3738 FB |
514 | /* Return < 0 if error. Important errors are: |
515 | -EIO generic I/O error (may happen for all errors) | |
516 | -ENOMEDIUM No media inserted. | |
517 | -EINVAL Invalid sector number or nb_sectors | |
518 | -EACCES Trying to write a read-only device | |
519 | */ | |
fc01f7e7 FB |
520 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
521 | const uint8_t *buf, int nb_sectors) | |
522 | { | |
83f64091 | 523 | BlockDriver *drv = bs->drv; |
19cb3738 FB |
524 | if (!bs->drv) |
525 | return -ENOMEDIUM; | |
0849bf08 | 526 | if (bs->read_only) |
19cb3738 | 527 | return -EACCES; |
79639d42 FB |
528 | if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { |
529 | memcpy(bs->boot_sector_data, buf, 512); | |
530 | } | |
83f64091 FB |
531 | if (drv->bdrv_pwrite) { |
532 | int ret, len; | |
533 | len = nb_sectors * 512; | |
534 | ret = drv->bdrv_pwrite(bs, sector_num * 512, buf, len); | |
535 | if (ret < 0) | |
536 | return ret; | |
537 | else if (ret != len) | |
538 | return -EIO; | |
539 | else | |
540 | return 0; | |
541 | } else { | |
542 | return drv->bdrv_write(bs, sector_num, buf, nb_sectors); | |
543 | } | |
544 | } | |
545 | ||
83f64091 | 546 | static int bdrv_pread_em(BlockDriverState *bs, int64_t offset, |
faea38e7 | 547 | uint8_t *buf, int count1) |
83f64091 | 548 | { |
83f64091 FB |
549 | uint8_t tmp_buf[SECTOR_SIZE]; |
550 | int len, nb_sectors, count; | |
551 | int64_t sector_num; | |
552 | ||
553 | count = count1; | |
554 | /* first read to align to sector start */ | |
555 | len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1); | |
556 | if (len > count) | |
557 | len = count; | |
558 | sector_num = offset >> SECTOR_BITS; | |
559 | if (len > 0) { | |
560 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
561 | return -EIO; | |
562 | memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len); | |
563 | count -= len; | |
564 | if (count == 0) | |
565 | return count1; | |
566 | sector_num++; | |
567 | buf += len; | |
568 | } | |
569 | ||
570 | /* read the sectors "in place" */ | |
571 | nb_sectors = count >> SECTOR_BITS; | |
572 | if (nb_sectors > 0) { | |
573 | if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0) | |
574 | return -EIO; | |
575 | sector_num += nb_sectors; | |
576 | len = nb_sectors << SECTOR_BITS; | |
577 | buf += len; | |
578 | count -= len; | |
579 | } | |
580 | ||
581 | /* add data from the last sector */ | |
582 | if (count > 0) { | |
583 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
584 | return -EIO; | |
585 | memcpy(buf, tmp_buf, count); | |
586 | } | |
587 | return count1; | |
588 | } | |
589 | ||
590 | static int bdrv_pwrite_em(BlockDriverState *bs, int64_t offset, | |
faea38e7 | 591 | const uint8_t *buf, int count1) |
83f64091 | 592 | { |
83f64091 FB |
593 | uint8_t tmp_buf[SECTOR_SIZE]; |
594 | int len, nb_sectors, count; | |
595 | int64_t sector_num; | |
596 | ||
597 | count = count1; | |
598 | /* first write to align to sector start */ | |
599 | len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1); | |
600 | if (len > count) | |
601 | len = count; | |
602 | sector_num = offset >> SECTOR_BITS; | |
603 | if (len > 0) { | |
604 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
605 | return -EIO; | |
606 | memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len); | |
607 | if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) | |
608 | return -EIO; | |
609 | count -= len; | |
610 | if (count == 0) | |
611 | return count1; | |
612 | sector_num++; | |
613 | buf += len; | |
614 | } | |
615 | ||
616 | /* write the sectors "in place" */ | |
617 | nb_sectors = count >> SECTOR_BITS; | |
618 | if (nb_sectors > 0) { | |
619 | if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0) | |
620 | return -EIO; | |
621 | sector_num += nb_sectors; | |
622 | len = nb_sectors << SECTOR_BITS; | |
623 | buf += len; | |
624 | count -= len; | |
625 | } | |
626 | ||
627 | /* add data from the last sector */ | |
628 | if (count > 0) { | |
629 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
630 | return -EIO; | |
631 | memcpy(tmp_buf, buf, count); | |
632 | if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) | |
633 | return -EIO; | |
634 | } | |
635 | return count1; | |
636 | } | |
83f64091 FB |
637 | |
638 | /** | |
639 | * Read with byte offsets (needed only for file protocols) | |
640 | */ | |
641 | int bdrv_pread(BlockDriverState *bs, int64_t offset, | |
642 | void *buf1, int count1) | |
643 | { | |
644 | BlockDriver *drv = bs->drv; | |
645 | ||
646 | if (!drv) | |
19cb3738 | 647 | return -ENOMEDIUM; |
83f64091 | 648 | if (!drv->bdrv_pread) |
faea38e7 | 649 | return bdrv_pread_em(bs, offset, buf1, count1); |
83f64091 FB |
650 | return drv->bdrv_pread(bs, offset, buf1, count1); |
651 | } | |
652 | ||
653 | /** | |
654 | * Write with byte offsets (needed only for file protocols) | |
655 | */ | |
656 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, | |
657 | const void *buf1, int count1) | |
658 | { | |
659 | BlockDriver *drv = bs->drv; | |
660 | ||
661 | if (!drv) | |
19cb3738 | 662 | return -ENOMEDIUM; |
83f64091 | 663 | if (!drv->bdrv_pwrite) |
faea38e7 | 664 | return bdrv_pwrite_em(bs, offset, buf1, count1); |
83f64091 FB |
665 | return drv->bdrv_pwrite(bs, offset, buf1, count1); |
666 | } | |
667 | ||
668 | /** | |
669 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
670 | */ | |
671 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
672 | { | |
673 | BlockDriver *drv = bs->drv; | |
674 | if (!drv) | |
19cb3738 | 675 | return -ENOMEDIUM; |
83f64091 FB |
676 | if (!drv->bdrv_truncate) |
677 | return -ENOTSUP; | |
678 | return drv->bdrv_truncate(bs, offset); | |
679 | } | |
680 | ||
681 | /** | |
682 | * Length of a file in bytes. Return < 0 if error or unknown. | |
683 | */ | |
684 | int64_t bdrv_getlength(BlockDriverState *bs) | |
685 | { | |
686 | BlockDriver *drv = bs->drv; | |
687 | if (!drv) | |
19cb3738 | 688 | return -ENOMEDIUM; |
83f64091 FB |
689 | if (!drv->bdrv_getlength) { |
690 | /* legacy mode */ | |
691 | return bs->total_sectors * SECTOR_SIZE; | |
692 | } | |
693 | return drv->bdrv_getlength(bs); | |
fc01f7e7 FB |
694 | } |
695 | ||
19cb3738 | 696 | /* return 0 as number of sectors if no device present or error */ |
fc01f7e7 FB |
697 | void bdrv_get_geometry(BlockDriverState *bs, int64_t *nb_sectors_ptr) |
698 | { | |
19cb3738 FB |
699 | int64_t length; |
700 | length = bdrv_getlength(bs); | |
701 | if (length < 0) | |
702 | length = 0; | |
703 | else | |
704 | length = length >> SECTOR_BITS; | |
705 | *nb_sectors_ptr = length; | |
fc01f7e7 | 706 | } |
cf98951b FB |
707 | |
708 | /* force a given boot sector. */ | |
709 | void bdrv_set_boot_sector(BlockDriverState *bs, const uint8_t *data, int size) | |
710 | { | |
711 | bs->boot_sector_enabled = 1; | |
712 | if (size > 512) | |
713 | size = 512; | |
714 | memcpy(bs->boot_sector_data, data, size); | |
715 | memset(bs->boot_sector_data + size, 0, 512 - size); | |
716 | } | |
b338082b FB |
717 | |
718 | void bdrv_set_geometry_hint(BlockDriverState *bs, | |
719 | int cyls, int heads, int secs) | |
720 | { | |
721 | bs->cyls = cyls; | |
722 | bs->heads = heads; | |
723 | bs->secs = secs; | |
724 | } | |
725 | ||
726 | void bdrv_set_type_hint(BlockDriverState *bs, int type) | |
727 | { | |
728 | bs->type = type; | |
729 | bs->removable = ((type == BDRV_TYPE_CDROM || | |
730 | type == BDRV_TYPE_FLOPPY)); | |
731 | } | |
732 | ||
46d4767d FB |
733 | void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
734 | { | |
735 | bs->translation = translation; | |
736 | } | |
737 | ||
b338082b FB |
738 | void bdrv_get_geometry_hint(BlockDriverState *bs, |
739 | int *pcyls, int *pheads, int *psecs) | |
740 | { | |
741 | *pcyls = bs->cyls; | |
742 | *pheads = bs->heads; | |
743 | *psecs = bs->secs; | |
744 | } | |
745 | ||
746 | int bdrv_get_type_hint(BlockDriverState *bs) | |
747 | { | |
748 | return bs->type; | |
749 | } | |
750 | ||
46d4767d FB |
751 | int bdrv_get_translation_hint(BlockDriverState *bs) |
752 | { | |
753 | return bs->translation; | |
754 | } | |
755 | ||
b338082b FB |
756 | int bdrv_is_removable(BlockDriverState *bs) |
757 | { | |
758 | return bs->removable; | |
759 | } | |
760 | ||
761 | int bdrv_is_read_only(BlockDriverState *bs) | |
762 | { | |
763 | return bs->read_only; | |
764 | } | |
765 | ||
19cb3738 | 766 | /* XXX: no longer used */ |
b338082b FB |
767 | void bdrv_set_change_cb(BlockDriverState *bs, |
768 | void (*change_cb)(void *opaque), void *opaque) | |
769 | { | |
770 | bs->change_cb = change_cb; | |
771 | bs->change_opaque = opaque; | |
772 | } | |
773 | ||
ea2384d3 FB |
774 | int bdrv_is_encrypted(BlockDriverState *bs) |
775 | { | |
776 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
777 | return 1; | |
778 | return bs->encrypted; | |
779 | } | |
780 | ||
781 | int bdrv_set_key(BlockDriverState *bs, const char *key) | |
782 | { | |
783 | int ret; | |
784 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
785 | ret = bdrv_set_key(bs->backing_hd, key); | |
786 | if (ret < 0) | |
787 | return ret; | |
788 | if (!bs->encrypted) | |
789 | return 0; | |
790 | } | |
791 | if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key) | |
792 | return -1; | |
793 | return bs->drv->bdrv_set_key(bs, key); | |
794 | } | |
795 | ||
796 | void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) | |
797 | { | |
19cb3738 | 798 | if (!bs->drv) { |
ea2384d3 FB |
799 | buf[0] = '\0'; |
800 | } else { | |
801 | pstrcpy(buf, buf_size, bs->drv->format_name); | |
802 | } | |
803 | } | |
804 | ||
805 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), | |
806 | void *opaque) | |
807 | { | |
808 | BlockDriver *drv; | |
809 | ||
810 | for (drv = first_drv; drv != NULL; drv = drv->next) { | |
811 | it(opaque, drv->format_name); | |
812 | } | |
813 | } | |
814 | ||
b338082b FB |
815 | BlockDriverState *bdrv_find(const char *name) |
816 | { | |
817 | BlockDriverState *bs; | |
818 | ||
819 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
820 | if (!strcmp(name, bs->device_name)) | |
821 | return bs; | |
822 | } | |
823 | return NULL; | |
824 | } | |
825 | ||
81d0912d FB |
826 | void bdrv_iterate(void (*it)(void *opaque, const char *name), void *opaque) |
827 | { | |
828 | BlockDriverState *bs; | |
829 | ||
830 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
831 | it(opaque, bs->device_name); | |
832 | } | |
833 | } | |
834 | ||
ea2384d3 FB |
835 | const char *bdrv_get_device_name(BlockDriverState *bs) |
836 | { | |
837 | return bs->device_name; | |
838 | } | |
839 | ||
7a6cba61 PB |
840 | void bdrv_flush(BlockDriverState *bs) |
841 | { | |
842 | if (bs->drv->bdrv_flush) | |
843 | bs->drv->bdrv_flush(bs); | |
844 | if (bs->backing_hd) | |
845 | bdrv_flush(bs->backing_hd); | |
846 | } | |
847 | ||
b338082b FB |
848 | void bdrv_info(void) |
849 | { | |
850 | BlockDriverState *bs; | |
851 | ||
852 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
853 | term_printf("%s:", bs->device_name); | |
854 | term_printf(" type="); | |
855 | switch(bs->type) { | |
856 | case BDRV_TYPE_HD: | |
857 | term_printf("hd"); | |
858 | break; | |
859 | case BDRV_TYPE_CDROM: | |
860 | term_printf("cdrom"); | |
861 | break; | |
862 | case BDRV_TYPE_FLOPPY: | |
863 | term_printf("floppy"); | |
864 | break; | |
865 | } | |
866 | term_printf(" removable=%d", bs->removable); | |
867 | if (bs->removable) { | |
868 | term_printf(" locked=%d", bs->locked); | |
869 | } | |
19cb3738 | 870 | if (bs->drv) { |
fef30743 TS |
871 | term_printf(" file="); |
872 | term_print_filename(bs->filename); | |
873 | if (bs->backing_file[0] != '\0') { | |
874 | term_printf(" backing_file="); | |
875 | term_print_filename(bs->backing_file); | |
876 | } | |
b338082b | 877 | term_printf(" ro=%d", bs->read_only); |
ea2384d3 FB |
878 | term_printf(" drv=%s", bs->drv->format_name); |
879 | if (bs->encrypted) | |
880 | term_printf(" encrypted"); | |
b338082b FB |
881 | } else { |
882 | term_printf(" [not inserted]"); | |
883 | } | |
884 | term_printf("\n"); | |
885 | } | |
886 | } | |
ea2384d3 | 887 | |
83f64091 FB |
888 | void bdrv_get_backing_filename(BlockDriverState *bs, |
889 | char *filename, int filename_size) | |
890 | { | |
891 | if (!bs->backing_hd) { | |
892 | pstrcpy(filename, filename_size, ""); | |
893 | } else { | |
894 | pstrcpy(filename, filename_size, bs->backing_file); | |
895 | } | |
896 | } | |
897 | ||
faea38e7 FB |
898 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
899 | const uint8_t *buf, int nb_sectors) | |
900 | { | |
901 | BlockDriver *drv = bs->drv; | |
902 | if (!drv) | |
19cb3738 | 903 | return -ENOMEDIUM; |
faea38e7 FB |
904 | if (!drv->bdrv_write_compressed) |
905 | return -ENOTSUP; | |
906 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); | |
907 | } | |
908 | ||
909 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) | |
910 | { | |
911 | BlockDriver *drv = bs->drv; | |
912 | if (!drv) | |
19cb3738 | 913 | return -ENOMEDIUM; |
faea38e7 FB |
914 | if (!drv->bdrv_get_info) |
915 | return -ENOTSUP; | |
916 | memset(bdi, 0, sizeof(*bdi)); | |
917 | return drv->bdrv_get_info(bs, bdi); | |
918 | } | |
919 | ||
920 | /**************************************************************/ | |
921 | /* handling of snapshots */ | |
922 | ||
923 | int bdrv_snapshot_create(BlockDriverState *bs, | |
924 | QEMUSnapshotInfo *sn_info) | |
925 | { | |
926 | BlockDriver *drv = bs->drv; | |
927 | if (!drv) | |
19cb3738 | 928 | return -ENOMEDIUM; |
faea38e7 FB |
929 | if (!drv->bdrv_snapshot_create) |
930 | return -ENOTSUP; | |
931 | return drv->bdrv_snapshot_create(bs, sn_info); | |
932 | } | |
933 | ||
934 | int bdrv_snapshot_goto(BlockDriverState *bs, | |
935 | const char *snapshot_id) | |
936 | { | |
937 | BlockDriver *drv = bs->drv; | |
938 | if (!drv) | |
19cb3738 | 939 | return -ENOMEDIUM; |
faea38e7 FB |
940 | if (!drv->bdrv_snapshot_goto) |
941 | return -ENOTSUP; | |
942 | return drv->bdrv_snapshot_goto(bs, snapshot_id); | |
943 | } | |
944 | ||
945 | int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) | |
946 | { | |
947 | BlockDriver *drv = bs->drv; | |
948 | if (!drv) | |
19cb3738 | 949 | return -ENOMEDIUM; |
faea38e7 FB |
950 | if (!drv->bdrv_snapshot_delete) |
951 | return -ENOTSUP; | |
952 | return drv->bdrv_snapshot_delete(bs, snapshot_id); | |
953 | } | |
954 | ||
955 | int bdrv_snapshot_list(BlockDriverState *bs, | |
956 | QEMUSnapshotInfo **psn_info) | |
957 | { | |
958 | BlockDriver *drv = bs->drv; | |
959 | if (!drv) | |
19cb3738 | 960 | return -ENOMEDIUM; |
faea38e7 FB |
961 | if (!drv->bdrv_snapshot_list) |
962 | return -ENOTSUP; | |
963 | return drv->bdrv_snapshot_list(bs, psn_info); | |
964 | } | |
965 | ||
966 | #define NB_SUFFIXES 4 | |
967 | ||
968 | char *get_human_readable_size(char *buf, int buf_size, int64_t size) | |
969 | { | |
970 | static const char suffixes[NB_SUFFIXES] = "KMGT"; | |
971 | int64_t base; | |
972 | int i; | |
973 | ||
974 | if (size <= 999) { | |
975 | snprintf(buf, buf_size, "%" PRId64, size); | |
976 | } else { | |
977 | base = 1024; | |
978 | for(i = 0; i < NB_SUFFIXES; i++) { | |
979 | if (size < (10 * base)) { | |
980 | snprintf(buf, buf_size, "%0.1f%c", | |
981 | (double)size / base, | |
982 | suffixes[i]); | |
983 | break; | |
984 | } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { | |
985 | snprintf(buf, buf_size, "%" PRId64 "%c", | |
986 | ((size + (base >> 1)) / base), | |
987 | suffixes[i]); | |
988 | break; | |
989 | } | |
990 | base = base * 1024; | |
991 | } | |
992 | } | |
993 | return buf; | |
994 | } | |
995 | ||
996 | char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) | |
997 | { | |
998 | char buf1[128], date_buf[128], clock_buf[128]; | |
999 | struct tm tm; | |
1000 | time_t ti; | |
1001 | int64_t secs; | |
1002 | ||
1003 | if (!sn) { | |
1004 | snprintf(buf, buf_size, | |
1005 | "%-10s%-20s%7s%20s%15s", | |
1006 | "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); | |
1007 | } else { | |
1008 | ti = sn->date_sec; | |
ce1a14dc | 1009 | #ifndef _WIN32 |
faea38e7 | 1010 | localtime_r(&ti, &tm); |
ce1a14dc | 1011 | #endif |
faea38e7 FB |
1012 | strftime(date_buf, sizeof(date_buf), |
1013 | "%Y-%m-%d %H:%M:%S", &tm); | |
1014 | secs = sn->vm_clock_nsec / 1000000000; | |
1015 | snprintf(clock_buf, sizeof(clock_buf), | |
1016 | "%02d:%02d:%02d.%03d", | |
1017 | (int)(secs / 3600), | |
1018 | (int)((secs / 60) % 60), | |
1019 | (int)(secs % 60), | |
1020 | (int)((sn->vm_clock_nsec / 1000000) % 1000)); | |
1021 | snprintf(buf, buf_size, | |
1022 | "%-10s%-20s%7s%20s%15s", | |
1023 | sn->id_str, sn->name, | |
1024 | get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), | |
1025 | date_buf, | |
1026 | clock_buf); | |
1027 | } | |
1028 | return buf; | |
1029 | } | |
1030 | ||
83f64091 | 1031 | |
ea2384d3 | 1032 | /**************************************************************/ |
83f64091 | 1033 | /* async I/Os */ |
ea2384d3 | 1034 | |
ce1a14dc PB |
1035 | BlockDriverAIOCB *bdrv_aio_read(BlockDriverState *bs, int64_t sector_num, |
1036 | uint8_t *buf, int nb_sectors, | |
1037 | BlockDriverCompletionFunc *cb, void *opaque) | |
83f64091 FB |
1038 | { |
1039 | BlockDriver *drv = bs->drv; | |
83f64091 | 1040 | |
19cb3738 | 1041 | if (!drv) |
ce1a14dc | 1042 | return NULL; |
83f64091 FB |
1043 | |
1044 | /* XXX: we assume that nb_sectors == 0 is suppored by the async read */ | |
1045 | if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { | |
1046 | memcpy(buf, bs->boot_sector_data, 512); | |
1047 | sector_num++; | |
1048 | nb_sectors--; | |
1049 | buf += 512; | |
1050 | } | |
1051 | ||
ce1a14dc | 1052 | return drv->bdrv_aio_read(bs, sector_num, buf, nb_sectors, cb, opaque); |
ea2384d3 FB |
1053 | } |
1054 | ||
ce1a14dc PB |
1055 | BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num, |
1056 | const uint8_t *buf, int nb_sectors, | |
1057 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 1058 | { |
83f64091 | 1059 | BlockDriver *drv = bs->drv; |
ea2384d3 | 1060 | |
19cb3738 | 1061 | if (!drv) |
ce1a14dc | 1062 | return NULL; |
83f64091 | 1063 | if (bs->read_only) |
ce1a14dc | 1064 | return NULL; |
83f64091 FB |
1065 | if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { |
1066 | memcpy(bs->boot_sector_data, buf, 512); | |
ea2384d3 | 1067 | } |
83f64091 | 1068 | |
ce1a14dc | 1069 | return drv->bdrv_aio_write(bs, sector_num, buf, nb_sectors, cb, opaque); |
83f64091 FB |
1070 | } |
1071 | ||
1072 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) | |
83f64091 | 1073 | { |
ce1a14dc | 1074 | BlockDriver *drv = acb->bs->drv; |
83f64091 | 1075 | |
ce1a14dc | 1076 | drv->bdrv_aio_cancel(acb); |
83f64091 FB |
1077 | } |
1078 | ||
ce1a14dc | 1079 | |
83f64091 FB |
1080 | /**************************************************************/ |
1081 | /* async block device emulation */ | |
1082 | ||
1083 | #ifdef QEMU_TOOL | |
ce1a14dc PB |
1084 | static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs, |
1085 | int64_t sector_num, uint8_t *buf, int nb_sectors, | |
1086 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 1087 | { |
ea2384d3 | 1088 | int ret; |
ce1a14dc PB |
1089 | ret = bdrv_read(bs, sector_num, buf, nb_sectors); |
1090 | cb(opaque, ret); | |
1091 | return NULL; | |
ea2384d3 FB |
1092 | } |
1093 | ||
ce1a14dc PB |
1094 | static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs, |
1095 | int64_t sector_num, const uint8_t *buf, int nb_sectors, | |
1096 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 1097 | { |
ea2384d3 | 1098 | int ret; |
ce1a14dc PB |
1099 | ret = bdrv_write(bs, sector_num, buf, nb_sectors); |
1100 | cb(opaque, ret); | |
1101 | return NULL; | |
ea2384d3 FB |
1102 | } |
1103 | ||
83f64091 | 1104 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb) |
ea2384d3 | 1105 | { |
ea2384d3 | 1106 | } |
83f64091 | 1107 | #else |
ce1a14dc | 1108 | static void bdrv_aio_bh_cb(void *opaque) |
83f64091 | 1109 | { |
ce1a14dc PB |
1110 | BlockDriverAIOCBSync *acb = opaque; |
1111 | acb->common.cb(acb->common.opaque, acb->ret); | |
1112 | qemu_aio_release(acb); | |
83f64091 | 1113 | } |
beac80cd | 1114 | |
ce1a14dc PB |
1115 | static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs, |
1116 | int64_t sector_num, uint8_t *buf, int nb_sectors, | |
1117 | BlockDriverCompletionFunc *cb, void *opaque) | |
83f64091 | 1118 | { |
ce1a14dc | 1119 | BlockDriverAIOCBSync *acb; |
83f64091 | 1120 | int ret; |
ce1a14dc PB |
1121 | |
1122 | acb = qemu_aio_get(bs, cb, opaque); | |
1123 | if (!acb->bh) | |
1124 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
1125 | ret = bdrv_read(bs, sector_num, buf, nb_sectors); | |
1126 | acb->ret = ret; | |
1127 | qemu_bh_schedule(acb->bh); | |
1128 | return &acb->common; | |
beac80cd FB |
1129 | } |
1130 | ||
ce1a14dc PB |
1131 | static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs, |
1132 | int64_t sector_num, const uint8_t *buf, int nb_sectors, | |
1133 | BlockDriverCompletionFunc *cb, void *opaque) | |
beac80cd | 1134 | { |
ce1a14dc | 1135 | BlockDriverAIOCBSync *acb; |
83f64091 | 1136 | int ret; |
83f64091 | 1137 | |
ce1a14dc PB |
1138 | acb = qemu_aio_get(bs, cb, opaque); |
1139 | if (!acb->bh) | |
1140 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
1141 | ret = bdrv_write(bs, sector_num, buf, nb_sectors); | |
1142 | acb->ret = ret; | |
1143 | qemu_bh_schedule(acb->bh); | |
1144 | return &acb->common; | |
beac80cd | 1145 | } |
beac80cd | 1146 | |
ce1a14dc | 1147 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) |
ea2384d3 | 1148 | { |
ce1a14dc PB |
1149 | BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb; |
1150 | qemu_bh_cancel(acb->bh); | |
1151 | qemu_aio_release(acb); | |
83f64091 FB |
1152 | } |
1153 | #endif /* !QEMU_TOOL */ | |
ea2384d3 | 1154 | |
83f64091 FB |
1155 | /**************************************************************/ |
1156 | /* sync block device emulation */ | |
ea2384d3 | 1157 | |
83f64091 FB |
1158 | static void bdrv_rw_em_cb(void *opaque, int ret) |
1159 | { | |
1160 | *(int *)opaque = ret; | |
ea2384d3 FB |
1161 | } |
1162 | ||
83f64091 FB |
1163 | #define NOT_DONE 0x7fffffff |
1164 | ||
1165 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, | |
1166 | uint8_t *buf, int nb_sectors) | |
7a6cba61 | 1167 | { |
ce1a14dc PB |
1168 | int async_ret; |
1169 | BlockDriverAIOCB *acb; | |
83f64091 | 1170 | |
83f64091 FB |
1171 | async_ret = NOT_DONE; |
1172 | qemu_aio_wait_start(); | |
ce1a14dc | 1173 | acb = bdrv_aio_read(bs, sector_num, buf, nb_sectors, |
83f64091 | 1174 | bdrv_rw_em_cb, &async_ret); |
ce1a14dc | 1175 | if (acb == NULL) { |
83f64091 | 1176 | qemu_aio_wait_end(); |
ce1a14dc | 1177 | return -1; |
83f64091 FB |
1178 | } |
1179 | while (async_ret == NOT_DONE) { | |
1180 | qemu_aio_wait(); | |
1181 | } | |
1182 | qemu_aio_wait_end(); | |
1183 | return async_ret; | |
7a6cba61 PB |
1184 | } |
1185 | ||
83f64091 FB |
1186 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
1187 | const uint8_t *buf, int nb_sectors) | |
1188 | { | |
ce1a14dc PB |
1189 | int async_ret; |
1190 | BlockDriverAIOCB *acb; | |
83f64091 | 1191 | |
83f64091 FB |
1192 | async_ret = NOT_DONE; |
1193 | qemu_aio_wait_start(); | |
ce1a14dc | 1194 | acb = bdrv_aio_write(bs, sector_num, buf, nb_sectors, |
83f64091 | 1195 | bdrv_rw_em_cb, &async_ret); |
ce1a14dc | 1196 | if (acb == NULL) { |
83f64091 | 1197 | qemu_aio_wait_end(); |
ce1a14dc | 1198 | return -1; |
83f64091 FB |
1199 | } |
1200 | while (async_ret == NOT_DONE) { | |
1201 | qemu_aio_wait(); | |
1202 | } | |
1203 | qemu_aio_wait_end(); | |
1204 | return async_ret; | |
1205 | } | |
ea2384d3 FB |
1206 | |
1207 | void bdrv_init(void) | |
1208 | { | |
1209 | bdrv_register(&bdrv_raw); | |
19cb3738 | 1210 | bdrv_register(&bdrv_host_device); |
ea2384d3 FB |
1211 | #ifndef _WIN32 |
1212 | bdrv_register(&bdrv_cow); | |
1213 | #endif | |
1214 | bdrv_register(&bdrv_qcow); | |
1215 | bdrv_register(&bdrv_vmdk); | |
3c56521b | 1216 | bdrv_register(&bdrv_cloop); |
585d0ed9 | 1217 | bdrv_register(&bdrv_dmg); |
a8753c34 | 1218 | bdrv_register(&bdrv_bochs); |
6a0f9e82 | 1219 | bdrv_register(&bdrv_vpc); |
712e7874 | 1220 | bdrv_register(&bdrv_vvfat); |
faea38e7 | 1221 | bdrv_register(&bdrv_qcow2); |
ea2384d3 | 1222 | } |
ce1a14dc PB |
1223 | |
1224 | void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb, | |
1225 | void *opaque) | |
1226 | { | |
1227 | BlockDriver *drv; | |
1228 | BlockDriverAIOCB *acb; | |
1229 | ||
1230 | drv = bs->drv; | |
1231 | if (drv->free_aiocb) { | |
1232 | acb = drv->free_aiocb; | |
1233 | drv->free_aiocb = acb->next; | |
1234 | } else { | |
1235 | acb = qemu_mallocz(drv->aiocb_size); | |
1236 | if (!acb) | |
1237 | return NULL; | |
1238 | } | |
1239 | acb->bs = bs; | |
1240 | acb->cb = cb; | |
1241 | acb->opaque = opaque; | |
1242 | return acb; | |
1243 | } | |
1244 | ||
1245 | void qemu_aio_release(void *p) | |
1246 | { | |
1247 | BlockDriverAIOCB *acb = p; | |
1248 | BlockDriver *drv = acb->bs->drv; | |
1249 | acb->next = drv->free_aiocb; | |
1250 | drv->free_aiocb = acb; | |
1251 | } | |
19cb3738 FB |
1252 | |
1253 | /**************************************************************/ | |
1254 | /* removable device support */ | |
1255 | ||
1256 | /** | |
1257 | * Return TRUE if the media is present | |
1258 | */ | |
1259 | int bdrv_is_inserted(BlockDriverState *bs) | |
1260 | { | |
1261 | BlockDriver *drv = bs->drv; | |
1262 | int ret; | |
1263 | if (!drv) | |
1264 | return 0; | |
1265 | if (!drv->bdrv_is_inserted) | |
1266 | return 1; | |
1267 | ret = drv->bdrv_is_inserted(bs); | |
1268 | return ret; | |
1269 | } | |
1270 | ||
1271 | /** | |
1272 | * Return TRUE if the media changed since the last call to this | |
1273 | * function. It is currently only used for floppy disks | |
1274 | */ | |
1275 | int bdrv_media_changed(BlockDriverState *bs) | |
1276 | { | |
1277 | BlockDriver *drv = bs->drv; | |
1278 | int ret; | |
1279 | ||
1280 | if (!drv || !drv->bdrv_media_changed) | |
1281 | ret = -ENOTSUP; | |
1282 | else | |
1283 | ret = drv->bdrv_media_changed(bs); | |
1284 | if (ret == -ENOTSUP) | |
1285 | ret = bs->media_changed; | |
1286 | bs->media_changed = 0; | |
1287 | return ret; | |
1288 | } | |
1289 | ||
1290 | /** | |
1291 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
1292 | */ | |
1293 | void bdrv_eject(BlockDriverState *bs, int eject_flag) | |
1294 | { | |
1295 | BlockDriver *drv = bs->drv; | |
1296 | int ret; | |
1297 | ||
1298 | if (!drv || !drv->bdrv_eject) { | |
1299 | ret = -ENOTSUP; | |
1300 | } else { | |
1301 | ret = drv->bdrv_eject(bs, eject_flag); | |
1302 | } | |
1303 | if (ret == -ENOTSUP) { | |
1304 | if (eject_flag) | |
1305 | bdrv_close(bs); | |
1306 | } | |
1307 | } | |
1308 | ||
1309 | int bdrv_is_locked(BlockDriverState *bs) | |
1310 | { | |
1311 | return bs->locked; | |
1312 | } | |
1313 | ||
1314 | /** | |
1315 | * Lock or unlock the media (if it is locked, the user won't be able | |
1316 | * to eject it manually). | |
1317 | */ | |
1318 | void bdrv_set_locked(BlockDriverState *bs, int locked) | |
1319 | { | |
1320 | BlockDriver *drv = bs->drv; | |
1321 | ||
1322 | bs->locked = locked; | |
1323 | if (drv && drv->bdrv_set_locked) { | |
1324 | drv->bdrv_set_locked(bs, locked); | |
1325 | } | |
1326 | } |