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Commit | Line | Data |
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fc01f7e7 FB |
1 | /* |
2 | * QEMU System Emulator block driver | |
5fafdf24 | 3 | * |
fc01f7e7 | 4 | * Copyright (c) 2003 Fabrice Bellard |
5fafdf24 | 5 | * |
fc01f7e7 FB |
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 | */ | |
faf07963 | 24 | #include "qemu-common.h" |
87ecb68b PB |
25 | #ifndef QEMU_IMG |
26 | #include "console.h" | |
faf07963 | 27 | #endif |
ea2384d3 | 28 | #include "block_int.h" |
fc01f7e7 | 29 | |
7674e7bf FB |
30 | #ifdef _BSD |
31 | #include <sys/types.h> | |
32 | #include <sys/stat.h> | |
33 | #include <sys/ioctl.h> | |
34 | #include <sys/queue.h> | |
35 | #include <sys/disk.h> | |
36 | #endif | |
37 | ||
83f64091 FB |
38 | #define SECTOR_BITS 9 |
39 | #define SECTOR_SIZE (1 << SECTOR_BITS) | |
40 | ||
90765429 FB |
41 | typedef struct BlockDriverAIOCBSync { |
42 | BlockDriverAIOCB common; | |
43 | QEMUBH *bh; | |
44 | int ret; | |
45 | } BlockDriverAIOCBSync; | |
46 | ||
ce1a14dc PB |
47 | static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs, |
48 | int64_t sector_num, uint8_t *buf, int nb_sectors, | |
49 | BlockDriverCompletionFunc *cb, void *opaque); | |
50 | static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs, | |
51 | int64_t sector_num, const uint8_t *buf, int nb_sectors, | |
52 | BlockDriverCompletionFunc *cb, void *opaque); | |
83f64091 | 53 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb); |
5fafdf24 | 54 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
83f64091 FB |
55 | uint8_t *buf, int nb_sectors); |
56 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, | |
57 | const uint8_t *buf, int nb_sectors); | |
ec530c81 | 58 | |
faf07963 | 59 | BlockDriverState *bdrv_first; |
ea2384d3 FB |
60 | static BlockDriver *first_drv; |
61 | ||
83f64091 | 62 | int path_is_absolute(const char *path) |
3b0d4f61 | 63 | { |
83f64091 | 64 | const char *p; |
21664424 FB |
65 | #ifdef _WIN32 |
66 | /* specific case for names like: "\\.\d:" */ | |
67 | if (*path == '/' || *path == '\\') | |
68 | return 1; | |
69 | #endif | |
83f64091 FB |
70 | p = strchr(path, ':'); |
71 | if (p) | |
72 | p++; | |
73 | else | |
74 | p = path; | |
3b9f94e1 FB |
75 | #ifdef _WIN32 |
76 | return (*p == '/' || *p == '\\'); | |
77 | #else | |
78 | return (*p == '/'); | |
79 | #endif | |
3b0d4f61 FB |
80 | } |
81 | ||
83f64091 FB |
82 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
83 | path to it by considering it is relative to base_path. URL are | |
84 | supported. */ | |
85 | void path_combine(char *dest, int dest_size, | |
86 | const char *base_path, | |
87 | const char *filename) | |
3b0d4f61 | 88 | { |
83f64091 FB |
89 | const char *p, *p1; |
90 | int len; | |
91 | ||
92 | if (dest_size <= 0) | |
93 | return; | |
94 | if (path_is_absolute(filename)) { | |
95 | pstrcpy(dest, dest_size, filename); | |
96 | } else { | |
97 | p = strchr(base_path, ':'); | |
98 | if (p) | |
99 | p++; | |
100 | else | |
101 | p = base_path; | |
3b9f94e1 FB |
102 | p1 = strrchr(base_path, '/'); |
103 | #ifdef _WIN32 | |
104 | { | |
105 | const char *p2; | |
106 | p2 = strrchr(base_path, '\\'); | |
107 | if (!p1 || p2 > p1) | |
108 | p1 = p2; | |
109 | } | |
110 | #endif | |
83f64091 FB |
111 | if (p1) |
112 | p1++; | |
113 | else | |
114 | p1 = base_path; | |
115 | if (p1 > p) | |
116 | p = p1; | |
117 | len = p - base_path; | |
118 | if (len > dest_size - 1) | |
119 | len = dest_size - 1; | |
120 | memcpy(dest, base_path, len); | |
121 | dest[len] = '\0'; | |
122 | pstrcat(dest, dest_size, filename); | |
3b0d4f61 | 123 | } |
3b0d4f61 FB |
124 | } |
125 | ||
3b0d4f61 | 126 | |
9596ebb7 | 127 | static void bdrv_register(BlockDriver *bdrv) |
ea2384d3 | 128 | { |
ce1a14dc | 129 | if (!bdrv->bdrv_aio_read) { |
83f64091 | 130 | /* add AIO emulation layer */ |
83f64091 FB |
131 | bdrv->bdrv_aio_read = bdrv_aio_read_em; |
132 | bdrv->bdrv_aio_write = bdrv_aio_write_em; | |
133 | bdrv->bdrv_aio_cancel = bdrv_aio_cancel_em; | |
90765429 | 134 | bdrv->aiocb_size = sizeof(BlockDriverAIOCBSync); |
83f64091 FB |
135 | } else if (!bdrv->bdrv_read && !bdrv->bdrv_pread) { |
136 | /* add synchronous IO emulation layer */ | |
137 | bdrv->bdrv_read = bdrv_read_em; | |
138 | bdrv->bdrv_write = bdrv_write_em; | |
139 | } | |
ea2384d3 FB |
140 | bdrv->next = first_drv; |
141 | first_drv = bdrv; | |
142 | } | |
b338082b FB |
143 | |
144 | /* create a new block device (by default it is empty) */ | |
145 | BlockDriverState *bdrv_new(const char *device_name) | |
146 | { | |
147 | BlockDriverState **pbs, *bs; | |
148 | ||
149 | bs = qemu_mallocz(sizeof(BlockDriverState)); | |
150 | if(!bs) | |
151 | return NULL; | |
152 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); | |
ea2384d3 FB |
153 | if (device_name[0] != '\0') { |
154 | /* insert at the end */ | |
155 | pbs = &bdrv_first; | |
156 | while (*pbs != NULL) | |
157 | pbs = &(*pbs)->next; | |
158 | *pbs = bs; | |
159 | } | |
b338082b FB |
160 | return bs; |
161 | } | |
162 | ||
ea2384d3 FB |
163 | BlockDriver *bdrv_find_format(const char *format_name) |
164 | { | |
165 | BlockDriver *drv1; | |
166 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { | |
167 | if (!strcmp(drv1->format_name, format_name)) | |
168 | return drv1; | |
169 | } | |
170 | return NULL; | |
171 | } | |
172 | ||
5fafdf24 | 173 | int bdrv_create(BlockDriver *drv, |
ea2384d3 FB |
174 | const char *filename, int64_t size_in_sectors, |
175 | const char *backing_file, int flags) | |
176 | { | |
177 | if (!drv->bdrv_create) | |
178 | return -ENOTSUP; | |
179 | return drv->bdrv_create(filename, size_in_sectors, backing_file, flags); | |
180 | } | |
181 | ||
d5249393 | 182 | #ifdef _WIN32 |
95389c86 | 183 | void get_tmp_filename(char *filename, int size) |
d5249393 | 184 | { |
3b9f94e1 | 185 | char temp_dir[MAX_PATH]; |
3b46e624 | 186 | |
3b9f94e1 FB |
187 | GetTempPath(MAX_PATH, temp_dir); |
188 | GetTempFileName(temp_dir, "qem", 0, filename); | |
d5249393 FB |
189 | } |
190 | #else | |
95389c86 | 191 | void get_tmp_filename(char *filename, int size) |
fc01f7e7 | 192 | { |
67b915a5 | 193 | int fd; |
d5249393 | 194 | /* XXX: race condition possible */ |
ea2384d3 FB |
195 | pstrcpy(filename, size, "/tmp/vl.XXXXXX"); |
196 | fd = mkstemp(filename); | |
197 | close(fd); | |
198 | } | |
d5249393 | 199 | #endif |
fc01f7e7 | 200 | |
19cb3738 | 201 | #ifdef _WIN32 |
f45512fe FB |
202 | static int is_windows_drive_prefix(const char *filename) |
203 | { | |
204 | return (((filename[0] >= 'a' && filename[0] <= 'z') || | |
205 | (filename[0] >= 'A' && filename[0] <= 'Z')) && | |
206 | filename[1] == ':'); | |
207 | } | |
3b46e624 | 208 | |
19cb3738 FB |
209 | static int is_windows_drive(const char *filename) |
210 | { | |
5fafdf24 | 211 | if (is_windows_drive_prefix(filename) && |
f45512fe | 212 | filename[2] == '\0') |
19cb3738 FB |
213 | return 1; |
214 | if (strstart(filename, "\\\\.\\", NULL) || | |
215 | strstart(filename, "//./", NULL)) | |
216 | return 1; | |
217 | return 0; | |
218 | } | |
219 | #endif | |
220 | ||
83f64091 FB |
221 | static BlockDriver *find_protocol(const char *filename) |
222 | { | |
223 | BlockDriver *drv1; | |
224 | char protocol[128]; | |
225 | int len; | |
226 | const char *p; | |
19cb3738 FB |
227 | |
228 | #ifdef _WIN32 | |
f45512fe FB |
229 | if (is_windows_drive(filename) || |
230 | is_windows_drive_prefix(filename)) | |
19cb3738 FB |
231 | return &bdrv_raw; |
232 | #endif | |
83f64091 FB |
233 | p = strchr(filename, ':'); |
234 | if (!p) | |
235 | return &bdrv_raw; | |
236 | len = p - filename; | |
237 | if (len > sizeof(protocol) - 1) | |
238 | len = sizeof(protocol) - 1; | |
83f64091 FB |
239 | memcpy(protocol, filename, len); |
240 | protocol[len] = '\0'; | |
241 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { | |
5fafdf24 | 242 | if (drv1->protocol_name && |
83f64091 FB |
243 | !strcmp(drv1->protocol_name, protocol)) |
244 | return drv1; | |
245 | } | |
246 | return NULL; | |
247 | } | |
248 | ||
7674e7bf FB |
249 | /* XXX: force raw format if block or character device ? It would |
250 | simplify the BSD case */ | |
ea2384d3 FB |
251 | static BlockDriver *find_image_format(const char *filename) |
252 | { | |
83f64091 | 253 | int ret, score, score_max; |
ea2384d3 | 254 | BlockDriver *drv1, *drv; |
83f64091 FB |
255 | uint8_t buf[2048]; |
256 | BlockDriverState *bs; | |
3b46e624 | 257 | |
19cb3738 FB |
258 | /* detect host devices. By convention, /dev/cdrom[N] is always |
259 | recognized as a host CDROM */ | |
260 | if (strstart(filename, "/dev/cdrom", NULL)) | |
261 | return &bdrv_host_device; | |
262 | #ifdef _WIN32 | |
263 | if (is_windows_drive(filename)) | |
264 | return &bdrv_host_device; | |
265 | #else | |
266 | { | |
267 | struct stat st; | |
5fafdf24 | 268 | if (stat(filename, &st) >= 0 && |
19cb3738 FB |
269 | (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) { |
270 | return &bdrv_host_device; | |
271 | } | |
272 | } | |
273 | #endif | |
3b46e624 | 274 | |
83f64091 | 275 | drv = find_protocol(filename); |
19cb3738 | 276 | /* no need to test disk image formats for vvfat */ |
83f64091 FB |
277 | if (drv == &bdrv_vvfat) |
278 | return drv; | |
19cb3738 | 279 | |
83f64091 FB |
280 | ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY); |
281 | if (ret < 0) | |
282 | return NULL; | |
283 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); | |
284 | bdrv_delete(bs); | |
285 | if (ret < 0) { | |
286 | return NULL; | |
287 | } | |
288 | ||
ea2384d3 FB |
289 | score_max = 0; |
290 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { | |
83f64091 FB |
291 | if (drv1->bdrv_probe) { |
292 | score = drv1->bdrv_probe(buf, ret, filename); | |
293 | if (score > score_max) { | |
294 | score_max = score; | |
295 | drv = drv1; | |
296 | } | |
0849bf08 | 297 | } |
fc01f7e7 | 298 | } |
ea2384d3 FB |
299 | return drv; |
300 | } | |
301 | ||
83f64091 | 302 | int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
ea2384d3 | 303 | { |
83f64091 FB |
304 | BlockDriverState *bs; |
305 | int ret; | |
306 | ||
307 | bs = bdrv_new(""); | |
308 | if (!bs) | |
309 | return -ENOMEM; | |
310 | ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL); | |
311 | if (ret < 0) { | |
312 | bdrv_delete(bs); | |
313 | return ret; | |
3b0d4f61 | 314 | } |
83f64091 FB |
315 | *pbs = bs; |
316 | return 0; | |
317 | } | |
318 | ||
319 | int bdrv_open(BlockDriverState *bs, const char *filename, int flags) | |
320 | { | |
321 | return bdrv_open2(bs, filename, flags, NULL); | |
ea2384d3 FB |
322 | } |
323 | ||
83f64091 | 324 | int bdrv_open2(BlockDriverState *bs, const char *filename, int flags, |
ea2384d3 FB |
325 | BlockDriver *drv) |
326 | { | |
83f64091 | 327 | int ret, open_flags; |
eb5c851f TS |
328 | char tmp_filename[PATH_MAX]; |
329 | char backing_filename[PATH_MAX]; | |
3b46e624 | 330 | |
ea2384d3 FB |
331 | bs->read_only = 0; |
332 | bs->is_temporary = 0; | |
333 | bs->encrypted = 0; | |
712e7874 | 334 | |
83f64091 | 335 | if (flags & BDRV_O_SNAPSHOT) { |
ea2384d3 FB |
336 | BlockDriverState *bs1; |
337 | int64_t total_size; | |
3b46e624 | 338 | |
ea2384d3 FB |
339 | /* if snapshot, we create a temporary backing file and open it |
340 | instead of opening 'filename' directly */ | |
33e3963e | 341 | |
ea2384d3 FB |
342 | /* if there is a backing file, use it */ |
343 | bs1 = bdrv_new(""); | |
344 | if (!bs1) { | |
83f64091 | 345 | return -ENOMEM; |
ea2384d3 FB |
346 | } |
347 | if (bdrv_open(bs1, filename, 0) < 0) { | |
348 | bdrv_delete(bs1); | |
349 | return -1; | |
350 | } | |
83f64091 | 351 | total_size = bdrv_getlength(bs1) >> SECTOR_BITS; |
ea2384d3 | 352 | bdrv_delete(bs1); |
3b46e624 | 353 | |
ea2384d3 | 354 | get_tmp_filename(tmp_filename, sizeof(tmp_filename)); |
a817d936 | 355 | realpath(filename, backing_filename); |
5fafdf24 | 356 | if (bdrv_create(&bdrv_qcow2, tmp_filename, |
a817d936 | 357 | total_size, backing_filename, 0) < 0) { |
ea2384d3 FB |
358 | return -1; |
359 | } | |
360 | filename = tmp_filename; | |
361 | bs->is_temporary = 1; | |
362 | } | |
712e7874 | 363 | |
ea2384d3 | 364 | pstrcpy(bs->filename, sizeof(bs->filename), filename); |
83f64091 FB |
365 | if (flags & BDRV_O_FILE) { |
366 | drv = find_protocol(filename); | |
ea2384d3 | 367 | if (!drv) |
83f64091 FB |
368 | return -ENOENT; |
369 | } else { | |
370 | if (!drv) { | |
371 | drv = find_image_format(filename); | |
372 | if (!drv) | |
373 | return -1; | |
374 | } | |
ea2384d3 FB |
375 | } |
376 | bs->drv = drv; | |
377 | bs->opaque = qemu_mallocz(drv->instance_size); | |
378 | if (bs->opaque == NULL && drv->instance_size > 0) | |
379 | return -1; | |
83f64091 FB |
380 | /* Note: for compatibility, we open disk image files as RDWR, and |
381 | RDONLY as fallback */ | |
382 | if (!(flags & BDRV_O_FILE)) | |
383 | open_flags = BDRV_O_RDWR; | |
384 | else | |
385 | open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT); | |
386 | ret = drv->bdrv_open(bs, filename, open_flags); | |
387 | if (ret == -EACCES && !(flags & BDRV_O_FILE)) { | |
388 | ret = drv->bdrv_open(bs, filename, BDRV_O_RDONLY); | |
389 | bs->read_only = 1; | |
390 | } | |
ea2384d3 FB |
391 | if (ret < 0) { |
392 | qemu_free(bs->opaque); | |
6b21b973 FB |
393 | bs->opaque = NULL; |
394 | bs->drv = NULL; | |
83f64091 | 395 | return ret; |
33e3963e | 396 | } |
d15a771d FB |
397 | if (drv->bdrv_getlength) { |
398 | bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; | |
399 | } | |
67b915a5 | 400 | #ifndef _WIN32 |
ea2384d3 FB |
401 | if (bs->is_temporary) { |
402 | unlink(filename); | |
403 | } | |
404 | #endif | |
83f64091 | 405 | if (bs->backing_file[0] != '\0') { |
ea2384d3 FB |
406 | /* if there is a backing file, use it */ |
407 | bs->backing_hd = bdrv_new(""); | |
408 | if (!bs->backing_hd) { | |
409 | fail: | |
410 | bdrv_close(bs); | |
6b21b973 | 411 | return -ENOMEM; |
33e3963e | 412 | } |
83f64091 FB |
413 | path_combine(backing_filename, sizeof(backing_filename), |
414 | filename, bs->backing_file); | |
415 | if (bdrv_open(bs->backing_hd, backing_filename, 0) < 0) | |
33e3963e | 416 | goto fail; |
33e3963e FB |
417 | } |
418 | ||
b338082b | 419 | /* call the change callback */ |
19cb3738 | 420 | bs->media_changed = 1; |
b338082b FB |
421 | if (bs->change_cb) |
422 | bs->change_cb(bs->change_opaque); | |
423 | ||
424 | return 0; | |
fc01f7e7 FB |
425 | } |
426 | ||
427 | void bdrv_close(BlockDriverState *bs) | |
428 | { | |
19cb3738 | 429 | if (bs->drv) { |
ea2384d3 FB |
430 | if (bs->backing_hd) |
431 | bdrv_delete(bs->backing_hd); | |
432 | bs->drv->bdrv_close(bs); | |
433 | qemu_free(bs->opaque); | |
434 | #ifdef _WIN32 | |
435 | if (bs->is_temporary) { | |
436 | unlink(bs->filename); | |
437 | } | |
67b915a5 | 438 | #endif |
ea2384d3 FB |
439 | bs->opaque = NULL; |
440 | bs->drv = NULL; | |
b338082b FB |
441 | |
442 | /* call the change callback */ | |
19cb3738 | 443 | bs->media_changed = 1; |
b338082b FB |
444 | if (bs->change_cb) |
445 | bs->change_cb(bs->change_opaque); | |
446 | } | |
447 | } | |
448 | ||
449 | void bdrv_delete(BlockDriverState *bs) | |
450 | { | |
ea2384d3 | 451 | /* XXX: remove the driver list */ |
b338082b FB |
452 | bdrv_close(bs); |
453 | qemu_free(bs); | |
fc01f7e7 FB |
454 | } |
455 | ||
33e3963e FB |
456 | /* commit COW file into the raw image */ |
457 | int bdrv_commit(BlockDriverState *bs) | |
458 | { | |
19cb3738 | 459 | BlockDriver *drv = bs->drv; |
83f64091 | 460 | int64_t i, total_sectors; |
ea2384d3 FB |
461 | int n, j; |
462 | unsigned char sector[512]; | |
33e3963e | 463 | |
19cb3738 FB |
464 | if (!drv) |
465 | return -ENOMEDIUM; | |
33e3963e FB |
466 | |
467 | if (bs->read_only) { | |
ea2384d3 | 468 | return -EACCES; |
33e3963e FB |
469 | } |
470 | ||
ea2384d3 FB |
471 | if (!bs->backing_hd) { |
472 | return -ENOTSUP; | |
473 | } | |
33e3963e | 474 | |
83f64091 FB |
475 | total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
476 | for (i = 0; i < total_sectors;) { | |
19cb3738 | 477 | if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { |
ea2384d3 FB |
478 | for(j = 0; j < n; j++) { |
479 | if (bdrv_read(bs, i, sector, 1) != 0) { | |
480 | return -EIO; | |
481 | } | |
482 | ||
483 | if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { | |
484 | return -EIO; | |
485 | } | |
486 | i++; | |
33e3963e | 487 | } |
ea2384d3 FB |
488 | } else { |
489 | i += n; | |
490 | } | |
33e3963e | 491 | } |
95389c86 | 492 | |
19cb3738 FB |
493 | if (drv->bdrv_make_empty) |
494 | return drv->bdrv_make_empty(bs); | |
95389c86 | 495 | |
33e3963e FB |
496 | return 0; |
497 | } | |
498 | ||
19cb3738 | 499 | /* return < 0 if error. See bdrv_write() for the return codes */ |
5fafdf24 | 500 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
501 | uint8_t *buf, int nb_sectors) |
502 | { | |
ea2384d3 FB |
503 | BlockDriver *drv = bs->drv; |
504 | ||
19cb3738 FB |
505 | if (!drv) |
506 | return -ENOMEDIUM; | |
b338082b | 507 | |
83f64091 | 508 | if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { |
cf98951b | 509 | memcpy(buf, bs->boot_sector_data, 512); |
83f64091 FB |
510 | sector_num++; |
511 | nb_sectors--; | |
512 | buf += 512; | |
513 | if (nb_sectors == 0) | |
514 | return 0; | |
515 | } | |
516 | if (drv->bdrv_pread) { | |
517 | int ret, len; | |
518 | len = nb_sectors * 512; | |
519 | ret = drv->bdrv_pread(bs, sector_num * 512, buf, len); | |
520 | if (ret < 0) | |
521 | return ret; | |
522 | else if (ret != len) | |
19cb3738 | 523 | return -EINVAL; |
83f64091 FB |
524 | else |
525 | return 0; | |
526 | } else { | |
527 | return drv->bdrv_read(bs, sector_num, buf, nb_sectors); | |
33e3963e | 528 | } |
fc01f7e7 FB |
529 | } |
530 | ||
5fafdf24 | 531 | /* Return < 0 if error. Important errors are: |
19cb3738 FB |
532 | -EIO generic I/O error (may happen for all errors) |
533 | -ENOMEDIUM No media inserted. | |
534 | -EINVAL Invalid sector number or nb_sectors | |
535 | -EACCES Trying to write a read-only device | |
536 | */ | |
5fafdf24 | 537 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
538 | const uint8_t *buf, int nb_sectors) |
539 | { | |
83f64091 | 540 | BlockDriver *drv = bs->drv; |
19cb3738 FB |
541 | if (!bs->drv) |
542 | return -ENOMEDIUM; | |
0849bf08 | 543 | if (bs->read_only) |
19cb3738 | 544 | return -EACCES; |
79639d42 | 545 | if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { |
3b46e624 | 546 | memcpy(bs->boot_sector_data, buf, 512); |
79639d42 | 547 | } |
83f64091 FB |
548 | if (drv->bdrv_pwrite) { |
549 | int ret, len; | |
550 | len = nb_sectors * 512; | |
551 | ret = drv->bdrv_pwrite(bs, sector_num * 512, buf, len); | |
552 | if (ret < 0) | |
553 | return ret; | |
554 | else if (ret != len) | |
555 | return -EIO; | |
556 | else | |
557 | return 0; | |
558 | } else { | |
559 | return drv->bdrv_write(bs, sector_num, buf, nb_sectors); | |
560 | } | |
561 | } | |
562 | ||
5fafdf24 | 563 | static int bdrv_pread_em(BlockDriverState *bs, int64_t offset, |
faea38e7 | 564 | uint8_t *buf, int count1) |
83f64091 | 565 | { |
83f64091 FB |
566 | uint8_t tmp_buf[SECTOR_SIZE]; |
567 | int len, nb_sectors, count; | |
568 | int64_t sector_num; | |
569 | ||
570 | count = count1; | |
571 | /* first read to align to sector start */ | |
572 | len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1); | |
573 | if (len > count) | |
574 | len = count; | |
575 | sector_num = offset >> SECTOR_BITS; | |
576 | if (len > 0) { | |
577 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
578 | return -EIO; | |
579 | memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len); | |
580 | count -= len; | |
581 | if (count == 0) | |
582 | return count1; | |
583 | sector_num++; | |
584 | buf += len; | |
585 | } | |
586 | ||
587 | /* read the sectors "in place" */ | |
588 | nb_sectors = count >> SECTOR_BITS; | |
589 | if (nb_sectors > 0) { | |
590 | if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0) | |
591 | return -EIO; | |
592 | sector_num += nb_sectors; | |
593 | len = nb_sectors << SECTOR_BITS; | |
594 | buf += len; | |
595 | count -= len; | |
596 | } | |
597 | ||
598 | /* add data from the last sector */ | |
599 | if (count > 0) { | |
600 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
601 | return -EIO; | |
602 | memcpy(buf, tmp_buf, count); | |
603 | } | |
604 | return count1; | |
605 | } | |
606 | ||
5fafdf24 | 607 | static int bdrv_pwrite_em(BlockDriverState *bs, int64_t offset, |
faea38e7 | 608 | const uint8_t *buf, int count1) |
83f64091 | 609 | { |
83f64091 FB |
610 | uint8_t tmp_buf[SECTOR_SIZE]; |
611 | int len, nb_sectors, count; | |
612 | int64_t sector_num; | |
613 | ||
614 | count = count1; | |
615 | /* first write to align to sector start */ | |
616 | len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1); | |
617 | if (len > count) | |
618 | len = count; | |
619 | sector_num = offset >> SECTOR_BITS; | |
620 | if (len > 0) { | |
621 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
622 | return -EIO; | |
623 | memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len); | |
624 | if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) | |
625 | return -EIO; | |
626 | count -= len; | |
627 | if (count == 0) | |
628 | return count1; | |
629 | sector_num++; | |
630 | buf += len; | |
631 | } | |
632 | ||
633 | /* write the sectors "in place" */ | |
634 | nb_sectors = count >> SECTOR_BITS; | |
635 | if (nb_sectors > 0) { | |
636 | if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0) | |
637 | return -EIO; | |
638 | sector_num += nb_sectors; | |
639 | len = nb_sectors << SECTOR_BITS; | |
640 | buf += len; | |
641 | count -= len; | |
642 | } | |
643 | ||
644 | /* add data from the last sector */ | |
645 | if (count > 0) { | |
646 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
647 | return -EIO; | |
648 | memcpy(tmp_buf, buf, count); | |
649 | if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) | |
650 | return -EIO; | |
651 | } | |
652 | return count1; | |
653 | } | |
83f64091 FB |
654 | |
655 | /** | |
5fafdf24 | 656 | * Read with byte offsets (needed only for file protocols) |
83f64091 | 657 | */ |
5fafdf24 | 658 | int bdrv_pread(BlockDriverState *bs, int64_t offset, |
83f64091 FB |
659 | void *buf1, int count1) |
660 | { | |
661 | BlockDriver *drv = bs->drv; | |
662 | ||
663 | if (!drv) | |
19cb3738 | 664 | return -ENOMEDIUM; |
83f64091 | 665 | if (!drv->bdrv_pread) |
faea38e7 | 666 | return bdrv_pread_em(bs, offset, buf1, count1); |
83f64091 FB |
667 | return drv->bdrv_pread(bs, offset, buf1, count1); |
668 | } | |
669 | ||
5fafdf24 TS |
670 | /** |
671 | * Write with byte offsets (needed only for file protocols) | |
83f64091 | 672 | */ |
5fafdf24 | 673 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, |
83f64091 FB |
674 | const void *buf1, int count1) |
675 | { | |
676 | BlockDriver *drv = bs->drv; | |
677 | ||
678 | if (!drv) | |
19cb3738 | 679 | return -ENOMEDIUM; |
83f64091 | 680 | if (!drv->bdrv_pwrite) |
faea38e7 | 681 | return bdrv_pwrite_em(bs, offset, buf1, count1); |
83f64091 FB |
682 | return drv->bdrv_pwrite(bs, offset, buf1, count1); |
683 | } | |
684 | ||
685 | /** | |
686 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
687 | */ | |
688 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
689 | { | |
690 | BlockDriver *drv = bs->drv; | |
691 | if (!drv) | |
19cb3738 | 692 | return -ENOMEDIUM; |
83f64091 FB |
693 | if (!drv->bdrv_truncate) |
694 | return -ENOTSUP; | |
695 | return drv->bdrv_truncate(bs, offset); | |
696 | } | |
697 | ||
698 | /** | |
699 | * Length of a file in bytes. Return < 0 if error or unknown. | |
700 | */ | |
701 | int64_t bdrv_getlength(BlockDriverState *bs) | |
702 | { | |
703 | BlockDriver *drv = bs->drv; | |
704 | if (!drv) | |
19cb3738 | 705 | return -ENOMEDIUM; |
83f64091 FB |
706 | if (!drv->bdrv_getlength) { |
707 | /* legacy mode */ | |
708 | return bs->total_sectors * SECTOR_SIZE; | |
709 | } | |
710 | return drv->bdrv_getlength(bs); | |
fc01f7e7 FB |
711 | } |
712 | ||
19cb3738 | 713 | /* return 0 as number of sectors if no device present or error */ |
fc01f7e7 FB |
714 | void bdrv_get_geometry(BlockDriverState *bs, int64_t *nb_sectors_ptr) |
715 | { | |
19cb3738 FB |
716 | int64_t length; |
717 | length = bdrv_getlength(bs); | |
718 | if (length < 0) | |
719 | length = 0; | |
720 | else | |
721 | length = length >> SECTOR_BITS; | |
722 | *nb_sectors_ptr = length; | |
fc01f7e7 | 723 | } |
cf98951b FB |
724 | |
725 | /* force a given boot sector. */ | |
726 | void bdrv_set_boot_sector(BlockDriverState *bs, const uint8_t *data, int size) | |
727 | { | |
728 | bs->boot_sector_enabled = 1; | |
729 | if (size > 512) | |
730 | size = 512; | |
731 | memcpy(bs->boot_sector_data, data, size); | |
732 | memset(bs->boot_sector_data + size, 0, 512 - size); | |
733 | } | |
b338082b | 734 | |
5fafdf24 | 735 | void bdrv_set_geometry_hint(BlockDriverState *bs, |
b338082b FB |
736 | int cyls, int heads, int secs) |
737 | { | |
738 | bs->cyls = cyls; | |
739 | bs->heads = heads; | |
740 | bs->secs = secs; | |
741 | } | |
742 | ||
743 | void bdrv_set_type_hint(BlockDriverState *bs, int type) | |
744 | { | |
745 | bs->type = type; | |
746 | bs->removable = ((type == BDRV_TYPE_CDROM || | |
747 | type == BDRV_TYPE_FLOPPY)); | |
748 | } | |
749 | ||
46d4767d FB |
750 | void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
751 | { | |
752 | bs->translation = translation; | |
753 | } | |
754 | ||
5fafdf24 | 755 | void bdrv_get_geometry_hint(BlockDriverState *bs, |
b338082b FB |
756 | int *pcyls, int *pheads, int *psecs) |
757 | { | |
758 | *pcyls = bs->cyls; | |
759 | *pheads = bs->heads; | |
760 | *psecs = bs->secs; | |
761 | } | |
762 | ||
763 | int bdrv_get_type_hint(BlockDriverState *bs) | |
764 | { | |
765 | return bs->type; | |
766 | } | |
767 | ||
46d4767d FB |
768 | int bdrv_get_translation_hint(BlockDriverState *bs) |
769 | { | |
770 | return bs->translation; | |
771 | } | |
772 | ||
b338082b FB |
773 | int bdrv_is_removable(BlockDriverState *bs) |
774 | { | |
775 | return bs->removable; | |
776 | } | |
777 | ||
778 | int bdrv_is_read_only(BlockDriverState *bs) | |
779 | { | |
780 | return bs->read_only; | |
781 | } | |
782 | ||
19cb3738 | 783 | /* XXX: no longer used */ |
5fafdf24 | 784 | void bdrv_set_change_cb(BlockDriverState *bs, |
b338082b FB |
785 | void (*change_cb)(void *opaque), void *opaque) |
786 | { | |
787 | bs->change_cb = change_cb; | |
788 | bs->change_opaque = opaque; | |
789 | } | |
790 | ||
ea2384d3 FB |
791 | int bdrv_is_encrypted(BlockDriverState *bs) |
792 | { | |
793 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
794 | return 1; | |
795 | return bs->encrypted; | |
796 | } | |
797 | ||
798 | int bdrv_set_key(BlockDriverState *bs, const char *key) | |
799 | { | |
800 | int ret; | |
801 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
802 | ret = bdrv_set_key(bs->backing_hd, key); | |
803 | if (ret < 0) | |
804 | return ret; | |
805 | if (!bs->encrypted) | |
806 | return 0; | |
807 | } | |
808 | if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key) | |
809 | return -1; | |
810 | return bs->drv->bdrv_set_key(bs, key); | |
811 | } | |
812 | ||
813 | void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) | |
814 | { | |
19cb3738 | 815 | if (!bs->drv) { |
ea2384d3 FB |
816 | buf[0] = '\0'; |
817 | } else { | |
818 | pstrcpy(buf, buf_size, bs->drv->format_name); | |
819 | } | |
820 | } | |
821 | ||
5fafdf24 | 822 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
ea2384d3 FB |
823 | void *opaque) |
824 | { | |
825 | BlockDriver *drv; | |
826 | ||
827 | for (drv = first_drv; drv != NULL; drv = drv->next) { | |
828 | it(opaque, drv->format_name); | |
829 | } | |
830 | } | |
831 | ||
b338082b FB |
832 | BlockDriverState *bdrv_find(const char *name) |
833 | { | |
834 | BlockDriverState *bs; | |
835 | ||
836 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
837 | if (!strcmp(name, bs->device_name)) | |
838 | return bs; | |
839 | } | |
840 | return NULL; | |
841 | } | |
842 | ||
81d0912d FB |
843 | void bdrv_iterate(void (*it)(void *opaque, const char *name), void *opaque) |
844 | { | |
845 | BlockDriverState *bs; | |
846 | ||
847 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
848 | it(opaque, bs->device_name); | |
849 | } | |
850 | } | |
851 | ||
ea2384d3 FB |
852 | const char *bdrv_get_device_name(BlockDriverState *bs) |
853 | { | |
854 | return bs->device_name; | |
855 | } | |
856 | ||
7a6cba61 PB |
857 | void bdrv_flush(BlockDriverState *bs) |
858 | { | |
859 | if (bs->drv->bdrv_flush) | |
860 | bs->drv->bdrv_flush(bs); | |
861 | if (bs->backing_hd) | |
862 | bdrv_flush(bs->backing_hd); | |
863 | } | |
864 | ||
faf07963 | 865 | #ifndef QEMU_IMG |
b338082b FB |
866 | void bdrv_info(void) |
867 | { | |
868 | BlockDriverState *bs; | |
869 | ||
870 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
871 | term_printf("%s:", bs->device_name); | |
872 | term_printf(" type="); | |
873 | switch(bs->type) { | |
874 | case BDRV_TYPE_HD: | |
875 | term_printf("hd"); | |
876 | break; | |
877 | case BDRV_TYPE_CDROM: | |
878 | term_printf("cdrom"); | |
879 | break; | |
880 | case BDRV_TYPE_FLOPPY: | |
881 | term_printf("floppy"); | |
882 | break; | |
883 | } | |
884 | term_printf(" removable=%d", bs->removable); | |
885 | if (bs->removable) { | |
886 | term_printf(" locked=%d", bs->locked); | |
887 | } | |
19cb3738 | 888 | if (bs->drv) { |
fef30743 TS |
889 | term_printf(" file="); |
890 | term_print_filename(bs->filename); | |
891 | if (bs->backing_file[0] != '\0') { | |
892 | term_printf(" backing_file="); | |
893 | term_print_filename(bs->backing_file); | |
894 | } | |
b338082b | 895 | term_printf(" ro=%d", bs->read_only); |
ea2384d3 FB |
896 | term_printf(" drv=%s", bs->drv->format_name); |
897 | if (bs->encrypted) | |
898 | term_printf(" encrypted"); | |
b338082b FB |
899 | } else { |
900 | term_printf(" [not inserted]"); | |
901 | } | |
902 | term_printf("\n"); | |
903 | } | |
904 | } | |
faf07963 | 905 | #endif |
ea2384d3 | 906 | |
5fafdf24 | 907 | void bdrv_get_backing_filename(BlockDriverState *bs, |
83f64091 FB |
908 | char *filename, int filename_size) |
909 | { | |
910 | if (!bs->backing_hd) { | |
911 | pstrcpy(filename, filename_size, ""); | |
912 | } else { | |
913 | pstrcpy(filename, filename_size, bs->backing_file); | |
914 | } | |
915 | } | |
916 | ||
5fafdf24 | 917 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
faea38e7 FB |
918 | const uint8_t *buf, int nb_sectors) |
919 | { | |
920 | BlockDriver *drv = bs->drv; | |
921 | if (!drv) | |
19cb3738 | 922 | return -ENOMEDIUM; |
faea38e7 FB |
923 | if (!drv->bdrv_write_compressed) |
924 | return -ENOTSUP; | |
925 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); | |
926 | } | |
3b46e624 | 927 | |
faea38e7 FB |
928 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
929 | { | |
930 | BlockDriver *drv = bs->drv; | |
931 | if (!drv) | |
19cb3738 | 932 | return -ENOMEDIUM; |
faea38e7 FB |
933 | if (!drv->bdrv_get_info) |
934 | return -ENOTSUP; | |
935 | memset(bdi, 0, sizeof(*bdi)); | |
936 | return drv->bdrv_get_info(bs, bdi); | |
937 | } | |
938 | ||
939 | /**************************************************************/ | |
940 | /* handling of snapshots */ | |
941 | ||
5fafdf24 | 942 | int bdrv_snapshot_create(BlockDriverState *bs, |
faea38e7 FB |
943 | QEMUSnapshotInfo *sn_info) |
944 | { | |
945 | BlockDriver *drv = bs->drv; | |
946 | if (!drv) | |
19cb3738 | 947 | return -ENOMEDIUM; |
faea38e7 FB |
948 | if (!drv->bdrv_snapshot_create) |
949 | return -ENOTSUP; | |
950 | return drv->bdrv_snapshot_create(bs, sn_info); | |
951 | } | |
952 | ||
5fafdf24 | 953 | int bdrv_snapshot_goto(BlockDriverState *bs, |
faea38e7 FB |
954 | const char *snapshot_id) |
955 | { | |
956 | BlockDriver *drv = bs->drv; | |
957 | if (!drv) | |
19cb3738 | 958 | return -ENOMEDIUM; |
faea38e7 FB |
959 | if (!drv->bdrv_snapshot_goto) |
960 | return -ENOTSUP; | |
961 | return drv->bdrv_snapshot_goto(bs, snapshot_id); | |
962 | } | |
963 | ||
964 | int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) | |
965 | { | |
966 | BlockDriver *drv = bs->drv; | |
967 | if (!drv) | |
19cb3738 | 968 | return -ENOMEDIUM; |
faea38e7 FB |
969 | if (!drv->bdrv_snapshot_delete) |
970 | return -ENOTSUP; | |
971 | return drv->bdrv_snapshot_delete(bs, snapshot_id); | |
972 | } | |
973 | ||
5fafdf24 | 974 | int bdrv_snapshot_list(BlockDriverState *bs, |
faea38e7 FB |
975 | QEMUSnapshotInfo **psn_info) |
976 | { | |
977 | BlockDriver *drv = bs->drv; | |
978 | if (!drv) | |
19cb3738 | 979 | return -ENOMEDIUM; |
faea38e7 FB |
980 | if (!drv->bdrv_snapshot_list) |
981 | return -ENOTSUP; | |
982 | return drv->bdrv_snapshot_list(bs, psn_info); | |
983 | } | |
984 | ||
985 | #define NB_SUFFIXES 4 | |
986 | ||
987 | char *get_human_readable_size(char *buf, int buf_size, int64_t size) | |
988 | { | |
989 | static const char suffixes[NB_SUFFIXES] = "KMGT"; | |
990 | int64_t base; | |
991 | int i; | |
992 | ||
993 | if (size <= 999) { | |
994 | snprintf(buf, buf_size, "%" PRId64, size); | |
995 | } else { | |
996 | base = 1024; | |
997 | for(i = 0; i < NB_SUFFIXES; i++) { | |
998 | if (size < (10 * base)) { | |
5fafdf24 | 999 | snprintf(buf, buf_size, "%0.1f%c", |
faea38e7 FB |
1000 | (double)size / base, |
1001 | suffixes[i]); | |
1002 | break; | |
1003 | } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { | |
5fafdf24 | 1004 | snprintf(buf, buf_size, "%" PRId64 "%c", |
faea38e7 FB |
1005 | ((size + (base >> 1)) / base), |
1006 | suffixes[i]); | |
1007 | break; | |
1008 | } | |
1009 | base = base * 1024; | |
1010 | } | |
1011 | } | |
1012 | return buf; | |
1013 | } | |
1014 | ||
1015 | char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) | |
1016 | { | |
1017 | char buf1[128], date_buf[128], clock_buf[128]; | |
3b9f94e1 FB |
1018 | #ifdef _WIN32 |
1019 | struct tm *ptm; | |
1020 | #else | |
faea38e7 | 1021 | struct tm tm; |
3b9f94e1 | 1022 | #endif |
faea38e7 FB |
1023 | time_t ti; |
1024 | int64_t secs; | |
1025 | ||
1026 | if (!sn) { | |
5fafdf24 TS |
1027 | snprintf(buf, buf_size, |
1028 | "%-10s%-20s%7s%20s%15s", | |
faea38e7 FB |
1029 | "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
1030 | } else { | |
1031 | ti = sn->date_sec; | |
3b9f94e1 FB |
1032 | #ifdef _WIN32 |
1033 | ptm = localtime(&ti); | |
1034 | strftime(date_buf, sizeof(date_buf), | |
1035 | "%Y-%m-%d %H:%M:%S", ptm); | |
1036 | #else | |
faea38e7 FB |
1037 | localtime_r(&ti, &tm); |
1038 | strftime(date_buf, sizeof(date_buf), | |
1039 | "%Y-%m-%d %H:%M:%S", &tm); | |
3b9f94e1 | 1040 | #endif |
faea38e7 FB |
1041 | secs = sn->vm_clock_nsec / 1000000000; |
1042 | snprintf(clock_buf, sizeof(clock_buf), | |
1043 | "%02d:%02d:%02d.%03d", | |
1044 | (int)(secs / 3600), | |
1045 | (int)((secs / 60) % 60), | |
5fafdf24 | 1046 | (int)(secs % 60), |
faea38e7 FB |
1047 | (int)((sn->vm_clock_nsec / 1000000) % 1000)); |
1048 | snprintf(buf, buf_size, | |
5fafdf24 | 1049 | "%-10s%-20s%7s%20s%15s", |
faea38e7 FB |
1050 | sn->id_str, sn->name, |
1051 | get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), | |
1052 | date_buf, | |
1053 | clock_buf); | |
1054 | } | |
1055 | return buf; | |
1056 | } | |
1057 | ||
83f64091 | 1058 | |
ea2384d3 | 1059 | /**************************************************************/ |
83f64091 | 1060 | /* async I/Os */ |
ea2384d3 | 1061 | |
ce1a14dc PB |
1062 | BlockDriverAIOCB *bdrv_aio_read(BlockDriverState *bs, int64_t sector_num, |
1063 | uint8_t *buf, int nb_sectors, | |
1064 | BlockDriverCompletionFunc *cb, void *opaque) | |
83f64091 FB |
1065 | { |
1066 | BlockDriver *drv = bs->drv; | |
83f64091 | 1067 | |
19cb3738 | 1068 | if (!drv) |
ce1a14dc | 1069 | return NULL; |
3b46e624 | 1070 | |
83f64091 FB |
1071 | /* XXX: we assume that nb_sectors == 0 is suppored by the async read */ |
1072 | if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { | |
1073 | memcpy(buf, bs->boot_sector_data, 512); | |
1074 | sector_num++; | |
1075 | nb_sectors--; | |
1076 | buf += 512; | |
1077 | } | |
1078 | ||
ce1a14dc | 1079 | return drv->bdrv_aio_read(bs, sector_num, buf, nb_sectors, cb, opaque); |
ea2384d3 FB |
1080 | } |
1081 | ||
ce1a14dc PB |
1082 | BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num, |
1083 | const uint8_t *buf, int nb_sectors, | |
1084 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 1085 | { |
83f64091 | 1086 | BlockDriver *drv = bs->drv; |
ea2384d3 | 1087 | |
19cb3738 | 1088 | if (!drv) |
ce1a14dc | 1089 | return NULL; |
83f64091 | 1090 | if (bs->read_only) |
ce1a14dc | 1091 | return NULL; |
83f64091 | 1092 | if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { |
3b46e624 | 1093 | memcpy(bs->boot_sector_data, buf, 512); |
ea2384d3 | 1094 | } |
83f64091 | 1095 | |
ce1a14dc | 1096 | return drv->bdrv_aio_write(bs, sector_num, buf, nb_sectors, cb, opaque); |
83f64091 FB |
1097 | } |
1098 | ||
1099 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) | |
83f64091 | 1100 | { |
ce1a14dc | 1101 | BlockDriver *drv = acb->bs->drv; |
83f64091 | 1102 | |
ce1a14dc | 1103 | drv->bdrv_aio_cancel(acb); |
83f64091 FB |
1104 | } |
1105 | ||
ce1a14dc | 1106 | |
83f64091 FB |
1107 | /**************************************************************/ |
1108 | /* async block device emulation */ | |
1109 | ||
faf07963 | 1110 | #ifdef QEMU_IMG |
ce1a14dc PB |
1111 | static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs, |
1112 | int64_t sector_num, uint8_t *buf, int nb_sectors, | |
1113 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 1114 | { |
ea2384d3 | 1115 | int ret; |
ce1a14dc PB |
1116 | ret = bdrv_read(bs, sector_num, buf, nb_sectors); |
1117 | cb(opaque, ret); | |
1118 | return NULL; | |
ea2384d3 FB |
1119 | } |
1120 | ||
ce1a14dc PB |
1121 | static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs, |
1122 | int64_t sector_num, const uint8_t *buf, int nb_sectors, | |
1123 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 1124 | { |
ea2384d3 | 1125 | int ret; |
ce1a14dc PB |
1126 | ret = bdrv_write(bs, sector_num, buf, nb_sectors); |
1127 | cb(opaque, ret); | |
1128 | return NULL; | |
ea2384d3 FB |
1129 | } |
1130 | ||
83f64091 | 1131 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb) |
ea2384d3 | 1132 | { |
ea2384d3 | 1133 | } |
83f64091 | 1134 | #else |
ce1a14dc | 1135 | static void bdrv_aio_bh_cb(void *opaque) |
83f64091 | 1136 | { |
ce1a14dc PB |
1137 | BlockDriverAIOCBSync *acb = opaque; |
1138 | acb->common.cb(acb->common.opaque, acb->ret); | |
1139 | qemu_aio_release(acb); | |
83f64091 | 1140 | } |
beac80cd | 1141 | |
ce1a14dc PB |
1142 | static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs, |
1143 | int64_t sector_num, uint8_t *buf, int nb_sectors, | |
1144 | BlockDriverCompletionFunc *cb, void *opaque) | |
83f64091 | 1145 | { |
ce1a14dc | 1146 | BlockDriverAIOCBSync *acb; |
83f64091 | 1147 | int ret; |
ce1a14dc PB |
1148 | |
1149 | acb = qemu_aio_get(bs, cb, opaque); | |
1150 | if (!acb->bh) | |
1151 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
1152 | ret = bdrv_read(bs, sector_num, buf, nb_sectors); | |
1153 | acb->ret = ret; | |
1154 | qemu_bh_schedule(acb->bh); | |
1155 | return &acb->common; | |
beac80cd FB |
1156 | } |
1157 | ||
ce1a14dc PB |
1158 | static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs, |
1159 | int64_t sector_num, const uint8_t *buf, int nb_sectors, | |
1160 | BlockDriverCompletionFunc *cb, void *opaque) | |
beac80cd | 1161 | { |
ce1a14dc | 1162 | BlockDriverAIOCBSync *acb; |
83f64091 | 1163 | int ret; |
83f64091 | 1164 | |
ce1a14dc PB |
1165 | acb = qemu_aio_get(bs, cb, opaque); |
1166 | if (!acb->bh) | |
1167 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
1168 | ret = bdrv_write(bs, sector_num, buf, nb_sectors); | |
1169 | acb->ret = ret; | |
1170 | qemu_bh_schedule(acb->bh); | |
1171 | return &acb->common; | |
beac80cd | 1172 | } |
beac80cd | 1173 | |
ce1a14dc | 1174 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) |
ea2384d3 | 1175 | { |
ce1a14dc PB |
1176 | BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb; |
1177 | qemu_bh_cancel(acb->bh); | |
1178 | qemu_aio_release(acb); | |
83f64091 | 1179 | } |
faf07963 | 1180 | #endif /* !QEMU_IMG */ |
ea2384d3 | 1181 | |
83f64091 FB |
1182 | /**************************************************************/ |
1183 | /* sync block device emulation */ | |
ea2384d3 | 1184 | |
83f64091 FB |
1185 | static void bdrv_rw_em_cb(void *opaque, int ret) |
1186 | { | |
1187 | *(int *)opaque = ret; | |
ea2384d3 FB |
1188 | } |
1189 | ||
83f64091 FB |
1190 | #define NOT_DONE 0x7fffffff |
1191 | ||
5fafdf24 | 1192 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
83f64091 | 1193 | uint8_t *buf, int nb_sectors) |
7a6cba61 | 1194 | { |
ce1a14dc PB |
1195 | int async_ret; |
1196 | BlockDriverAIOCB *acb; | |
83f64091 | 1197 | |
83f64091 FB |
1198 | async_ret = NOT_DONE; |
1199 | qemu_aio_wait_start(); | |
5fafdf24 | 1200 | acb = bdrv_aio_read(bs, sector_num, buf, nb_sectors, |
83f64091 | 1201 | bdrv_rw_em_cb, &async_ret); |
ce1a14dc | 1202 | if (acb == NULL) { |
83f64091 | 1203 | qemu_aio_wait_end(); |
ce1a14dc | 1204 | return -1; |
83f64091 FB |
1205 | } |
1206 | while (async_ret == NOT_DONE) { | |
1207 | qemu_aio_wait(); | |
1208 | } | |
1209 | qemu_aio_wait_end(); | |
1210 | return async_ret; | |
7a6cba61 PB |
1211 | } |
1212 | ||
83f64091 FB |
1213 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
1214 | const uint8_t *buf, int nb_sectors) | |
1215 | { | |
ce1a14dc PB |
1216 | int async_ret; |
1217 | BlockDriverAIOCB *acb; | |
83f64091 | 1218 | |
83f64091 FB |
1219 | async_ret = NOT_DONE; |
1220 | qemu_aio_wait_start(); | |
5fafdf24 | 1221 | acb = bdrv_aio_write(bs, sector_num, buf, nb_sectors, |
83f64091 | 1222 | bdrv_rw_em_cb, &async_ret); |
ce1a14dc | 1223 | if (acb == NULL) { |
83f64091 | 1224 | qemu_aio_wait_end(); |
ce1a14dc | 1225 | return -1; |
83f64091 FB |
1226 | } |
1227 | while (async_ret == NOT_DONE) { | |
1228 | qemu_aio_wait(); | |
1229 | } | |
1230 | qemu_aio_wait_end(); | |
1231 | return async_ret; | |
1232 | } | |
ea2384d3 FB |
1233 | |
1234 | void bdrv_init(void) | |
1235 | { | |
1236 | bdrv_register(&bdrv_raw); | |
19cb3738 | 1237 | bdrv_register(&bdrv_host_device); |
ea2384d3 FB |
1238 | #ifndef _WIN32 |
1239 | bdrv_register(&bdrv_cow); | |
1240 | #endif | |
1241 | bdrv_register(&bdrv_qcow); | |
1242 | bdrv_register(&bdrv_vmdk); | |
3c56521b | 1243 | bdrv_register(&bdrv_cloop); |
585d0ed9 | 1244 | bdrv_register(&bdrv_dmg); |
a8753c34 | 1245 | bdrv_register(&bdrv_bochs); |
6a0f9e82 | 1246 | bdrv_register(&bdrv_vpc); |
712e7874 | 1247 | bdrv_register(&bdrv_vvfat); |
faea38e7 | 1248 | bdrv_register(&bdrv_qcow2); |
6ada7453 | 1249 | bdrv_register(&bdrv_parallels); |
ea2384d3 | 1250 | } |
ce1a14dc PB |
1251 | |
1252 | void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb, | |
1253 | void *opaque) | |
1254 | { | |
1255 | BlockDriver *drv; | |
1256 | BlockDriverAIOCB *acb; | |
1257 | ||
1258 | drv = bs->drv; | |
1259 | if (drv->free_aiocb) { | |
1260 | acb = drv->free_aiocb; | |
1261 | drv->free_aiocb = acb->next; | |
1262 | } else { | |
1263 | acb = qemu_mallocz(drv->aiocb_size); | |
1264 | if (!acb) | |
1265 | return NULL; | |
1266 | } | |
1267 | acb->bs = bs; | |
1268 | acb->cb = cb; | |
1269 | acb->opaque = opaque; | |
1270 | return acb; | |
1271 | } | |
1272 | ||
1273 | void qemu_aio_release(void *p) | |
1274 | { | |
1275 | BlockDriverAIOCB *acb = p; | |
1276 | BlockDriver *drv = acb->bs->drv; | |
1277 | acb->next = drv->free_aiocb; | |
1278 | drv->free_aiocb = acb; | |
1279 | } | |
19cb3738 FB |
1280 | |
1281 | /**************************************************************/ | |
1282 | /* removable device support */ | |
1283 | ||
1284 | /** | |
1285 | * Return TRUE if the media is present | |
1286 | */ | |
1287 | int bdrv_is_inserted(BlockDriverState *bs) | |
1288 | { | |
1289 | BlockDriver *drv = bs->drv; | |
1290 | int ret; | |
1291 | if (!drv) | |
1292 | return 0; | |
1293 | if (!drv->bdrv_is_inserted) | |
1294 | return 1; | |
1295 | ret = drv->bdrv_is_inserted(bs); | |
1296 | return ret; | |
1297 | } | |
1298 | ||
1299 | /** | |
1300 | * Return TRUE if the media changed since the last call to this | |
5fafdf24 | 1301 | * function. It is currently only used for floppy disks |
19cb3738 FB |
1302 | */ |
1303 | int bdrv_media_changed(BlockDriverState *bs) | |
1304 | { | |
1305 | BlockDriver *drv = bs->drv; | |
1306 | int ret; | |
1307 | ||
1308 | if (!drv || !drv->bdrv_media_changed) | |
1309 | ret = -ENOTSUP; | |
1310 | else | |
1311 | ret = drv->bdrv_media_changed(bs); | |
1312 | if (ret == -ENOTSUP) | |
1313 | ret = bs->media_changed; | |
1314 | bs->media_changed = 0; | |
1315 | return ret; | |
1316 | } | |
1317 | ||
1318 | /** | |
1319 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
1320 | */ | |
1321 | void bdrv_eject(BlockDriverState *bs, int eject_flag) | |
1322 | { | |
1323 | BlockDriver *drv = bs->drv; | |
1324 | int ret; | |
1325 | ||
1326 | if (!drv || !drv->bdrv_eject) { | |
1327 | ret = -ENOTSUP; | |
1328 | } else { | |
1329 | ret = drv->bdrv_eject(bs, eject_flag); | |
1330 | } | |
1331 | if (ret == -ENOTSUP) { | |
1332 | if (eject_flag) | |
1333 | bdrv_close(bs); | |
1334 | } | |
1335 | } | |
1336 | ||
1337 | int bdrv_is_locked(BlockDriverState *bs) | |
1338 | { | |
1339 | return bs->locked; | |
1340 | } | |
1341 | ||
1342 | /** | |
1343 | * Lock or unlock the media (if it is locked, the user won't be able | |
1344 | * to eject it manually). | |
1345 | */ | |
1346 | void bdrv_set_locked(BlockDriverState *bs, int locked) | |
1347 | { | |
1348 | BlockDriver *drv = bs->drv; | |
1349 | ||
1350 | bs->locked = locked; | |
1351 | if (drv && drv->bdrv_set_locked) { | |
1352 | drv->bdrv_set_locked(bs, locked); | |
1353 | } | |
1354 | } |