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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 PB |
24 | #ifdef QEMU_IMG |
25 | #include "qemu-common.h" | |
26 | #else | |
fc01f7e7 | 27 | #include "vl.h" |
faf07963 | 28 | #endif |
ea2384d3 | 29 | #include "block_int.h" |
fc01f7e7 | 30 | |
7674e7bf FB |
31 | #ifdef _BSD |
32 | #include <sys/types.h> | |
33 | #include <sys/stat.h> | |
34 | #include <sys/ioctl.h> | |
35 | #include <sys/queue.h> | |
36 | #include <sys/disk.h> | |
37 | #endif | |
38 | ||
83f64091 FB |
39 | #define SECTOR_BITS 9 |
40 | #define SECTOR_SIZE (1 << SECTOR_BITS) | |
41 | ||
90765429 FB |
42 | typedef struct BlockDriverAIOCBSync { |
43 | BlockDriverAIOCB common; | |
44 | QEMUBH *bh; | |
45 | int ret; | |
46 | } BlockDriverAIOCBSync; | |
47 | ||
ce1a14dc PB |
48 | static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs, |
49 | int64_t sector_num, uint8_t *buf, int nb_sectors, | |
50 | BlockDriverCompletionFunc *cb, void *opaque); | |
51 | static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs, | |
52 | int64_t sector_num, const uint8_t *buf, int nb_sectors, | |
53 | BlockDriverCompletionFunc *cb, void *opaque); | |
83f64091 | 54 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb); |
5fafdf24 | 55 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
83f64091 FB |
56 | uint8_t *buf, int nb_sectors); |
57 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, | |
58 | const uint8_t *buf, int nb_sectors); | |
ec530c81 | 59 | |
faf07963 | 60 | BlockDriverState *bdrv_first; |
ea2384d3 FB |
61 | static BlockDriver *first_drv; |
62 | ||
83f64091 | 63 | int path_is_absolute(const char *path) |
3b0d4f61 | 64 | { |
83f64091 | 65 | const char *p; |
21664424 FB |
66 | #ifdef _WIN32 |
67 | /* specific case for names like: "\\.\d:" */ | |
68 | if (*path == '/' || *path == '\\') | |
69 | return 1; | |
70 | #endif | |
83f64091 FB |
71 | p = strchr(path, ':'); |
72 | if (p) | |
73 | p++; | |
74 | else | |
75 | p = path; | |
3b9f94e1 FB |
76 | #ifdef _WIN32 |
77 | return (*p == '/' || *p == '\\'); | |
78 | #else | |
79 | return (*p == '/'); | |
80 | #endif | |
3b0d4f61 FB |
81 | } |
82 | ||
83f64091 FB |
83 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
84 | path to it by considering it is relative to base_path. URL are | |
85 | supported. */ | |
86 | void path_combine(char *dest, int dest_size, | |
87 | const char *base_path, | |
88 | const char *filename) | |
3b0d4f61 | 89 | { |
83f64091 FB |
90 | const char *p, *p1; |
91 | int len; | |
92 | ||
93 | if (dest_size <= 0) | |
94 | return; | |
95 | if (path_is_absolute(filename)) { | |
96 | pstrcpy(dest, dest_size, filename); | |
97 | } else { | |
98 | p = strchr(base_path, ':'); | |
99 | if (p) | |
100 | p++; | |
101 | else | |
102 | p = base_path; | |
3b9f94e1 FB |
103 | p1 = strrchr(base_path, '/'); |
104 | #ifdef _WIN32 | |
105 | { | |
106 | const char *p2; | |
107 | p2 = strrchr(base_path, '\\'); | |
108 | if (!p1 || p2 > p1) | |
109 | p1 = p2; | |
110 | } | |
111 | #endif | |
83f64091 FB |
112 | if (p1) |
113 | p1++; | |
114 | else | |
115 | p1 = base_path; | |
116 | if (p1 > p) | |
117 | p = p1; | |
118 | len = p - base_path; | |
119 | if (len > dest_size - 1) | |
120 | len = dest_size - 1; | |
121 | memcpy(dest, base_path, len); | |
122 | dest[len] = '\0'; | |
123 | pstrcat(dest, dest_size, filename); | |
3b0d4f61 | 124 | } |
3b0d4f61 FB |
125 | } |
126 | ||
3b0d4f61 | 127 | |
ea2384d3 FB |
128 | void bdrv_register(BlockDriver *bdrv) |
129 | { | |
ce1a14dc | 130 | if (!bdrv->bdrv_aio_read) { |
83f64091 | 131 | /* add AIO emulation layer */ |
83f64091 FB |
132 | bdrv->bdrv_aio_read = bdrv_aio_read_em; |
133 | bdrv->bdrv_aio_write = bdrv_aio_write_em; | |
134 | bdrv->bdrv_aio_cancel = bdrv_aio_cancel_em; | |
90765429 | 135 | bdrv->aiocb_size = sizeof(BlockDriverAIOCBSync); |
83f64091 FB |
136 | } else if (!bdrv->bdrv_read && !bdrv->bdrv_pread) { |
137 | /* add synchronous IO emulation layer */ | |
138 | bdrv->bdrv_read = bdrv_read_em; | |
139 | bdrv->bdrv_write = bdrv_write_em; | |
140 | } | |
ea2384d3 FB |
141 | bdrv->next = first_drv; |
142 | first_drv = bdrv; | |
143 | } | |
b338082b FB |
144 | |
145 | /* create a new block device (by default it is empty) */ | |
146 | BlockDriverState *bdrv_new(const char *device_name) | |
147 | { | |
148 | BlockDriverState **pbs, *bs; | |
149 | ||
150 | bs = qemu_mallocz(sizeof(BlockDriverState)); | |
151 | if(!bs) | |
152 | return NULL; | |
153 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); | |
ea2384d3 FB |
154 | if (device_name[0] != '\0') { |
155 | /* insert at the end */ | |
156 | pbs = &bdrv_first; | |
157 | while (*pbs != NULL) | |
158 | pbs = &(*pbs)->next; | |
159 | *pbs = bs; | |
160 | } | |
b338082b FB |
161 | return bs; |
162 | } | |
163 | ||
ea2384d3 FB |
164 | BlockDriver *bdrv_find_format(const char *format_name) |
165 | { | |
166 | BlockDriver *drv1; | |
167 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { | |
168 | if (!strcmp(drv1->format_name, format_name)) | |
169 | return drv1; | |
170 | } | |
171 | return NULL; | |
172 | } | |
173 | ||
5fafdf24 | 174 | int bdrv_create(BlockDriver *drv, |
ea2384d3 FB |
175 | const char *filename, int64_t size_in_sectors, |
176 | const char *backing_file, int flags) | |
177 | { | |
178 | if (!drv->bdrv_create) | |
179 | return -ENOTSUP; | |
180 | return drv->bdrv_create(filename, size_in_sectors, backing_file, flags); | |
181 | } | |
182 | ||
d5249393 | 183 | #ifdef _WIN32 |
95389c86 | 184 | void get_tmp_filename(char *filename, int size) |
d5249393 | 185 | { |
3b9f94e1 | 186 | char temp_dir[MAX_PATH]; |
3b46e624 | 187 | |
3b9f94e1 FB |
188 | GetTempPath(MAX_PATH, temp_dir); |
189 | GetTempFileName(temp_dir, "qem", 0, filename); | |
d5249393 FB |
190 | } |
191 | #else | |
95389c86 | 192 | void get_tmp_filename(char *filename, int size) |
fc01f7e7 | 193 | { |
67b915a5 | 194 | int fd; |
d5249393 | 195 | /* XXX: race condition possible */ |
ea2384d3 FB |
196 | pstrcpy(filename, size, "/tmp/vl.XXXXXX"); |
197 | fd = mkstemp(filename); | |
198 | close(fd); | |
199 | } | |
d5249393 | 200 | #endif |
fc01f7e7 | 201 | |
19cb3738 | 202 | #ifdef _WIN32 |
f45512fe FB |
203 | static int is_windows_drive_prefix(const char *filename) |
204 | { | |
205 | return (((filename[0] >= 'a' && filename[0] <= 'z') || | |
206 | (filename[0] >= 'A' && filename[0] <= 'Z')) && | |
207 | filename[1] == ':'); | |
208 | } | |
3b46e624 | 209 | |
19cb3738 FB |
210 | static int is_windows_drive(const char *filename) |
211 | { | |
5fafdf24 | 212 | if (is_windows_drive_prefix(filename) && |
f45512fe | 213 | filename[2] == '\0') |
19cb3738 FB |
214 | return 1; |
215 | if (strstart(filename, "\\\\.\\", NULL) || | |
216 | strstart(filename, "//./", NULL)) | |
217 | return 1; | |
218 | return 0; | |
219 | } | |
220 | #endif | |
221 | ||
83f64091 FB |
222 | static BlockDriver *find_protocol(const char *filename) |
223 | { | |
224 | BlockDriver *drv1; | |
225 | char protocol[128]; | |
226 | int len; | |
227 | const char *p; | |
19cb3738 FB |
228 | |
229 | #ifdef _WIN32 | |
f45512fe FB |
230 | if (is_windows_drive(filename) || |
231 | is_windows_drive_prefix(filename)) | |
19cb3738 FB |
232 | return &bdrv_raw; |
233 | #endif | |
83f64091 FB |
234 | p = strchr(filename, ':'); |
235 | if (!p) | |
236 | return &bdrv_raw; | |
237 | len = p - filename; | |
238 | if (len > sizeof(protocol) - 1) | |
239 | len = sizeof(protocol) - 1; | |
83f64091 FB |
240 | memcpy(protocol, filename, len); |
241 | protocol[len] = '\0'; | |
242 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { | |
5fafdf24 | 243 | if (drv1->protocol_name && |
83f64091 FB |
244 | !strcmp(drv1->protocol_name, protocol)) |
245 | return drv1; | |
246 | } | |
247 | return NULL; | |
248 | } | |
249 | ||
7674e7bf FB |
250 | /* XXX: force raw format if block or character device ? It would |
251 | simplify the BSD case */ | |
ea2384d3 FB |
252 | static BlockDriver *find_image_format(const char *filename) |
253 | { | |
83f64091 | 254 | int ret, score, score_max; |
ea2384d3 | 255 | BlockDriver *drv1, *drv; |
83f64091 FB |
256 | uint8_t buf[2048]; |
257 | BlockDriverState *bs; | |
3b46e624 | 258 | |
19cb3738 FB |
259 | /* detect host devices. By convention, /dev/cdrom[N] is always |
260 | recognized as a host CDROM */ | |
261 | if (strstart(filename, "/dev/cdrom", NULL)) | |
262 | return &bdrv_host_device; | |
263 | #ifdef _WIN32 | |
264 | if (is_windows_drive(filename)) | |
265 | return &bdrv_host_device; | |
266 | #else | |
267 | { | |
268 | struct stat st; | |
5fafdf24 | 269 | if (stat(filename, &st) >= 0 && |
19cb3738 FB |
270 | (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) { |
271 | return &bdrv_host_device; | |
272 | } | |
273 | } | |
274 | #endif | |
3b46e624 | 275 | |
83f64091 | 276 | drv = find_protocol(filename); |
19cb3738 | 277 | /* no need to test disk image formats for vvfat */ |
83f64091 FB |
278 | if (drv == &bdrv_vvfat) |
279 | return drv; | |
19cb3738 | 280 | |
83f64091 FB |
281 | ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY); |
282 | if (ret < 0) | |
283 | return NULL; | |
284 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); | |
285 | bdrv_delete(bs); | |
286 | if (ret < 0) { | |
287 | return NULL; | |
288 | } | |
289 | ||
ea2384d3 FB |
290 | score_max = 0; |
291 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { | |
83f64091 FB |
292 | if (drv1->bdrv_probe) { |
293 | score = drv1->bdrv_probe(buf, ret, filename); | |
294 | if (score > score_max) { | |
295 | score_max = score; | |
296 | drv = drv1; | |
297 | } | |
0849bf08 | 298 | } |
fc01f7e7 | 299 | } |
ea2384d3 FB |
300 | return drv; |
301 | } | |
302 | ||
83f64091 | 303 | int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
ea2384d3 | 304 | { |
83f64091 FB |
305 | BlockDriverState *bs; |
306 | int ret; | |
307 | ||
308 | bs = bdrv_new(""); | |
309 | if (!bs) | |
310 | return -ENOMEM; | |
311 | ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL); | |
312 | if (ret < 0) { | |
313 | bdrv_delete(bs); | |
314 | return ret; | |
3b0d4f61 | 315 | } |
83f64091 FB |
316 | *pbs = bs; |
317 | return 0; | |
318 | } | |
319 | ||
320 | int bdrv_open(BlockDriverState *bs, const char *filename, int flags) | |
321 | { | |
322 | return bdrv_open2(bs, filename, flags, NULL); | |
ea2384d3 FB |
323 | } |
324 | ||
83f64091 | 325 | int bdrv_open2(BlockDriverState *bs, const char *filename, int flags, |
ea2384d3 FB |
326 | BlockDriver *drv) |
327 | { | |
83f64091 | 328 | int ret, open_flags; |
eb5c851f TS |
329 | char tmp_filename[PATH_MAX]; |
330 | char backing_filename[PATH_MAX]; | |
3b46e624 | 331 | |
ea2384d3 FB |
332 | bs->read_only = 0; |
333 | bs->is_temporary = 0; | |
334 | bs->encrypted = 0; | |
712e7874 | 335 | |
83f64091 | 336 | if (flags & BDRV_O_SNAPSHOT) { |
ea2384d3 FB |
337 | BlockDriverState *bs1; |
338 | int64_t total_size; | |
3b46e624 | 339 | |
ea2384d3 FB |
340 | /* if snapshot, we create a temporary backing file and open it |
341 | instead of opening 'filename' directly */ | |
33e3963e | 342 | |
ea2384d3 FB |
343 | /* if there is a backing file, use it */ |
344 | bs1 = bdrv_new(""); | |
345 | if (!bs1) { | |
83f64091 | 346 | return -ENOMEM; |
ea2384d3 FB |
347 | } |
348 | if (bdrv_open(bs1, filename, 0) < 0) { | |
349 | bdrv_delete(bs1); | |
350 | return -1; | |
351 | } | |
83f64091 | 352 | total_size = bdrv_getlength(bs1) >> SECTOR_BITS; |
ea2384d3 | 353 | bdrv_delete(bs1); |
3b46e624 | 354 | |
ea2384d3 | 355 | get_tmp_filename(tmp_filename, sizeof(tmp_filename)); |
a817d936 | 356 | realpath(filename, backing_filename); |
5fafdf24 | 357 | if (bdrv_create(&bdrv_qcow2, tmp_filename, |
a817d936 | 358 | total_size, backing_filename, 0) < 0) { |
ea2384d3 FB |
359 | return -1; |
360 | } | |
361 | filename = tmp_filename; | |
362 | bs->is_temporary = 1; | |
363 | } | |
712e7874 | 364 | |
ea2384d3 | 365 | pstrcpy(bs->filename, sizeof(bs->filename), filename); |
83f64091 FB |
366 | if (flags & BDRV_O_FILE) { |
367 | drv = find_protocol(filename); | |
ea2384d3 | 368 | if (!drv) |
83f64091 FB |
369 | return -ENOENT; |
370 | } else { | |
371 | if (!drv) { | |
372 | drv = find_image_format(filename); | |
373 | if (!drv) | |
374 | return -1; | |
375 | } | |
ea2384d3 FB |
376 | } |
377 | bs->drv = drv; | |
378 | bs->opaque = qemu_mallocz(drv->instance_size); | |
379 | if (bs->opaque == NULL && drv->instance_size > 0) | |
380 | return -1; | |
83f64091 FB |
381 | /* Note: for compatibility, we open disk image files as RDWR, and |
382 | RDONLY as fallback */ | |
383 | if (!(flags & BDRV_O_FILE)) | |
384 | open_flags = BDRV_O_RDWR; | |
385 | else | |
386 | open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT); | |
387 | ret = drv->bdrv_open(bs, filename, open_flags); | |
388 | if (ret == -EACCES && !(flags & BDRV_O_FILE)) { | |
389 | ret = drv->bdrv_open(bs, filename, BDRV_O_RDONLY); | |
390 | bs->read_only = 1; | |
391 | } | |
ea2384d3 FB |
392 | if (ret < 0) { |
393 | qemu_free(bs->opaque); | |
6b21b973 FB |
394 | bs->opaque = NULL; |
395 | bs->drv = NULL; | |
83f64091 | 396 | return ret; |
33e3963e | 397 | } |
d15a771d FB |
398 | if (drv->bdrv_getlength) { |
399 | bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; | |
400 | } | |
67b915a5 | 401 | #ifndef _WIN32 |
ea2384d3 FB |
402 | if (bs->is_temporary) { |
403 | unlink(filename); | |
404 | } | |
405 | #endif | |
83f64091 | 406 | if (bs->backing_file[0] != '\0') { |
ea2384d3 FB |
407 | /* if there is a backing file, use it */ |
408 | bs->backing_hd = bdrv_new(""); | |
409 | if (!bs->backing_hd) { | |
410 | fail: | |
411 | bdrv_close(bs); | |
6b21b973 | 412 | return -ENOMEM; |
33e3963e | 413 | } |
83f64091 FB |
414 | path_combine(backing_filename, sizeof(backing_filename), |
415 | filename, bs->backing_file); | |
416 | if (bdrv_open(bs->backing_hd, backing_filename, 0) < 0) | |
33e3963e | 417 | goto fail; |
33e3963e FB |
418 | } |
419 | ||
b338082b | 420 | /* call the change callback */ |
19cb3738 | 421 | bs->media_changed = 1; |
b338082b FB |
422 | if (bs->change_cb) |
423 | bs->change_cb(bs->change_opaque); | |
424 | ||
425 | return 0; | |
fc01f7e7 FB |
426 | } |
427 | ||
428 | void bdrv_close(BlockDriverState *bs) | |
429 | { | |
19cb3738 | 430 | if (bs->drv) { |
ea2384d3 FB |
431 | if (bs->backing_hd) |
432 | bdrv_delete(bs->backing_hd); | |
433 | bs->drv->bdrv_close(bs); | |
434 | qemu_free(bs->opaque); | |
435 | #ifdef _WIN32 | |
436 | if (bs->is_temporary) { | |
437 | unlink(bs->filename); | |
438 | } | |
67b915a5 | 439 | #endif |
ea2384d3 FB |
440 | bs->opaque = NULL; |
441 | bs->drv = NULL; | |
b338082b FB |
442 | |
443 | /* call the change callback */ | |
19cb3738 | 444 | bs->media_changed = 1; |
b338082b FB |
445 | if (bs->change_cb) |
446 | bs->change_cb(bs->change_opaque); | |
447 | } | |
448 | } | |
449 | ||
450 | void bdrv_delete(BlockDriverState *bs) | |
451 | { | |
ea2384d3 | 452 | /* XXX: remove the driver list */ |
b338082b FB |
453 | bdrv_close(bs); |
454 | qemu_free(bs); | |
fc01f7e7 FB |
455 | } |
456 | ||
33e3963e FB |
457 | /* commit COW file into the raw image */ |
458 | int bdrv_commit(BlockDriverState *bs) | |
459 | { | |
19cb3738 | 460 | BlockDriver *drv = bs->drv; |
83f64091 | 461 | int64_t i, total_sectors; |
ea2384d3 FB |
462 | int n, j; |
463 | unsigned char sector[512]; | |
33e3963e | 464 | |
19cb3738 FB |
465 | if (!drv) |
466 | return -ENOMEDIUM; | |
33e3963e FB |
467 | |
468 | if (bs->read_only) { | |
ea2384d3 | 469 | return -EACCES; |
33e3963e FB |
470 | } |
471 | ||
ea2384d3 FB |
472 | if (!bs->backing_hd) { |
473 | return -ENOTSUP; | |
474 | } | |
33e3963e | 475 | |
83f64091 FB |
476 | total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
477 | for (i = 0; i < total_sectors;) { | |
19cb3738 | 478 | if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { |
ea2384d3 FB |
479 | for(j = 0; j < n; j++) { |
480 | if (bdrv_read(bs, i, sector, 1) != 0) { | |
481 | return -EIO; | |
482 | } | |
483 | ||
484 | if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { | |
485 | return -EIO; | |
486 | } | |
487 | i++; | |
33e3963e | 488 | } |
ea2384d3 FB |
489 | } else { |
490 | i += n; | |
491 | } | |
33e3963e | 492 | } |
95389c86 | 493 | |
19cb3738 FB |
494 | if (drv->bdrv_make_empty) |
495 | return drv->bdrv_make_empty(bs); | |
95389c86 | 496 | |
33e3963e FB |
497 | return 0; |
498 | } | |
499 | ||
19cb3738 | 500 | /* return < 0 if error. See bdrv_write() for the return codes */ |
5fafdf24 | 501 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
502 | uint8_t *buf, int nb_sectors) |
503 | { | |
ea2384d3 FB |
504 | BlockDriver *drv = bs->drv; |
505 | ||
19cb3738 FB |
506 | if (!drv) |
507 | return -ENOMEDIUM; | |
b338082b | 508 | |
83f64091 | 509 | if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { |
cf98951b | 510 | memcpy(buf, bs->boot_sector_data, 512); |
83f64091 FB |
511 | sector_num++; |
512 | nb_sectors--; | |
513 | buf += 512; | |
514 | if (nb_sectors == 0) | |
515 | return 0; | |
516 | } | |
517 | if (drv->bdrv_pread) { | |
518 | int ret, len; | |
519 | len = nb_sectors * 512; | |
520 | ret = drv->bdrv_pread(bs, sector_num * 512, buf, len); | |
521 | if (ret < 0) | |
522 | return ret; | |
523 | else if (ret != len) | |
19cb3738 | 524 | return -EINVAL; |
83f64091 FB |
525 | else |
526 | return 0; | |
527 | } else { | |
528 | return drv->bdrv_read(bs, sector_num, buf, nb_sectors); | |
33e3963e | 529 | } |
fc01f7e7 FB |
530 | } |
531 | ||
5fafdf24 | 532 | /* Return < 0 if error. Important errors are: |
19cb3738 FB |
533 | -EIO generic I/O error (may happen for all errors) |
534 | -ENOMEDIUM No media inserted. | |
535 | -EINVAL Invalid sector number or nb_sectors | |
536 | -EACCES Trying to write a read-only device | |
537 | */ | |
5fafdf24 | 538 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
539 | const uint8_t *buf, int nb_sectors) |
540 | { | |
83f64091 | 541 | BlockDriver *drv = bs->drv; |
19cb3738 FB |
542 | if (!bs->drv) |
543 | return -ENOMEDIUM; | |
0849bf08 | 544 | if (bs->read_only) |
19cb3738 | 545 | return -EACCES; |
79639d42 | 546 | if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { |
3b46e624 | 547 | memcpy(bs->boot_sector_data, buf, 512); |
79639d42 | 548 | } |
83f64091 FB |
549 | if (drv->bdrv_pwrite) { |
550 | int ret, len; | |
551 | len = nb_sectors * 512; | |
552 | ret = drv->bdrv_pwrite(bs, sector_num * 512, buf, len); | |
553 | if (ret < 0) | |
554 | return ret; | |
555 | else if (ret != len) | |
556 | return -EIO; | |
557 | else | |
558 | return 0; | |
559 | } else { | |
560 | return drv->bdrv_write(bs, sector_num, buf, nb_sectors); | |
561 | } | |
562 | } | |
563 | ||
5fafdf24 | 564 | static int bdrv_pread_em(BlockDriverState *bs, int64_t offset, |
faea38e7 | 565 | uint8_t *buf, int count1) |
83f64091 | 566 | { |
83f64091 FB |
567 | uint8_t tmp_buf[SECTOR_SIZE]; |
568 | int len, nb_sectors, count; | |
569 | int64_t sector_num; | |
570 | ||
571 | count = count1; | |
572 | /* first read to align to sector start */ | |
573 | len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1); | |
574 | if (len > count) | |
575 | len = count; | |
576 | sector_num = offset >> SECTOR_BITS; | |
577 | if (len > 0) { | |
578 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
579 | return -EIO; | |
580 | memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len); | |
581 | count -= len; | |
582 | if (count == 0) | |
583 | return count1; | |
584 | sector_num++; | |
585 | buf += len; | |
586 | } | |
587 | ||
588 | /* read the sectors "in place" */ | |
589 | nb_sectors = count >> SECTOR_BITS; | |
590 | if (nb_sectors > 0) { | |
591 | if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0) | |
592 | return -EIO; | |
593 | sector_num += nb_sectors; | |
594 | len = nb_sectors << SECTOR_BITS; | |
595 | buf += len; | |
596 | count -= len; | |
597 | } | |
598 | ||
599 | /* add data from the last sector */ | |
600 | if (count > 0) { | |
601 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
602 | return -EIO; | |
603 | memcpy(buf, tmp_buf, count); | |
604 | } | |
605 | return count1; | |
606 | } | |
607 | ||
5fafdf24 | 608 | static int bdrv_pwrite_em(BlockDriverState *bs, int64_t offset, |
faea38e7 | 609 | const uint8_t *buf, int count1) |
83f64091 | 610 | { |
83f64091 FB |
611 | uint8_t tmp_buf[SECTOR_SIZE]; |
612 | int len, nb_sectors, count; | |
613 | int64_t sector_num; | |
614 | ||
615 | count = count1; | |
616 | /* first write to align to sector start */ | |
617 | len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1); | |
618 | if (len > count) | |
619 | len = count; | |
620 | sector_num = offset >> SECTOR_BITS; | |
621 | if (len > 0) { | |
622 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
623 | return -EIO; | |
624 | memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len); | |
625 | if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) | |
626 | return -EIO; | |
627 | count -= len; | |
628 | if (count == 0) | |
629 | return count1; | |
630 | sector_num++; | |
631 | buf += len; | |
632 | } | |
633 | ||
634 | /* write the sectors "in place" */ | |
635 | nb_sectors = count >> SECTOR_BITS; | |
636 | if (nb_sectors > 0) { | |
637 | if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0) | |
638 | return -EIO; | |
639 | sector_num += nb_sectors; | |
640 | len = nb_sectors << SECTOR_BITS; | |
641 | buf += len; | |
642 | count -= len; | |
643 | } | |
644 | ||
645 | /* add data from the last sector */ | |
646 | if (count > 0) { | |
647 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
648 | return -EIO; | |
649 | memcpy(tmp_buf, buf, count); | |
650 | if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) | |
651 | return -EIO; | |
652 | } | |
653 | return count1; | |
654 | } | |
83f64091 FB |
655 | |
656 | /** | |
5fafdf24 | 657 | * Read with byte offsets (needed only for file protocols) |
83f64091 | 658 | */ |
5fafdf24 | 659 | int bdrv_pread(BlockDriverState *bs, int64_t offset, |
83f64091 FB |
660 | void *buf1, int count1) |
661 | { | |
662 | BlockDriver *drv = bs->drv; | |
663 | ||
664 | if (!drv) | |
19cb3738 | 665 | return -ENOMEDIUM; |
83f64091 | 666 | if (!drv->bdrv_pread) |
faea38e7 | 667 | return bdrv_pread_em(bs, offset, buf1, count1); |
83f64091 FB |
668 | return drv->bdrv_pread(bs, offset, buf1, count1); |
669 | } | |
670 | ||
5fafdf24 TS |
671 | /** |
672 | * Write with byte offsets (needed only for file protocols) | |
83f64091 | 673 | */ |
5fafdf24 | 674 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, |
83f64091 FB |
675 | const void *buf1, int count1) |
676 | { | |
677 | BlockDriver *drv = bs->drv; | |
678 | ||
679 | if (!drv) | |
19cb3738 | 680 | return -ENOMEDIUM; |
83f64091 | 681 | if (!drv->bdrv_pwrite) |
faea38e7 | 682 | return bdrv_pwrite_em(bs, offset, buf1, count1); |
83f64091 FB |
683 | return drv->bdrv_pwrite(bs, offset, buf1, count1); |
684 | } | |
685 | ||
686 | /** | |
687 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
688 | */ | |
689 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
690 | { | |
691 | BlockDriver *drv = bs->drv; | |
692 | if (!drv) | |
19cb3738 | 693 | return -ENOMEDIUM; |
83f64091 FB |
694 | if (!drv->bdrv_truncate) |
695 | return -ENOTSUP; | |
696 | return drv->bdrv_truncate(bs, offset); | |
697 | } | |
698 | ||
699 | /** | |
700 | * Length of a file in bytes. Return < 0 if error or unknown. | |
701 | */ | |
702 | int64_t bdrv_getlength(BlockDriverState *bs) | |
703 | { | |
704 | BlockDriver *drv = bs->drv; | |
705 | if (!drv) | |
19cb3738 | 706 | return -ENOMEDIUM; |
83f64091 FB |
707 | if (!drv->bdrv_getlength) { |
708 | /* legacy mode */ | |
709 | return bs->total_sectors * SECTOR_SIZE; | |
710 | } | |
711 | return drv->bdrv_getlength(bs); | |
fc01f7e7 FB |
712 | } |
713 | ||
19cb3738 | 714 | /* return 0 as number of sectors if no device present or error */ |
fc01f7e7 FB |
715 | void bdrv_get_geometry(BlockDriverState *bs, int64_t *nb_sectors_ptr) |
716 | { | |
19cb3738 FB |
717 | int64_t length; |
718 | length = bdrv_getlength(bs); | |
719 | if (length < 0) | |
720 | length = 0; | |
721 | else | |
722 | length = length >> SECTOR_BITS; | |
723 | *nb_sectors_ptr = length; | |
fc01f7e7 | 724 | } |
cf98951b FB |
725 | |
726 | /* force a given boot sector. */ | |
727 | void bdrv_set_boot_sector(BlockDriverState *bs, const uint8_t *data, int size) | |
728 | { | |
729 | bs->boot_sector_enabled = 1; | |
730 | if (size > 512) | |
731 | size = 512; | |
732 | memcpy(bs->boot_sector_data, data, size); | |
733 | memset(bs->boot_sector_data + size, 0, 512 - size); | |
734 | } | |
b338082b | 735 | |
5fafdf24 | 736 | void bdrv_set_geometry_hint(BlockDriverState *bs, |
b338082b FB |
737 | int cyls, int heads, int secs) |
738 | { | |
739 | bs->cyls = cyls; | |
740 | bs->heads = heads; | |
741 | bs->secs = secs; | |
742 | } | |
743 | ||
744 | void bdrv_set_type_hint(BlockDriverState *bs, int type) | |
745 | { | |
746 | bs->type = type; | |
747 | bs->removable = ((type == BDRV_TYPE_CDROM || | |
748 | type == BDRV_TYPE_FLOPPY)); | |
749 | } | |
750 | ||
46d4767d FB |
751 | void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
752 | { | |
753 | bs->translation = translation; | |
754 | } | |
755 | ||
5fafdf24 | 756 | void bdrv_get_geometry_hint(BlockDriverState *bs, |
b338082b FB |
757 | int *pcyls, int *pheads, int *psecs) |
758 | { | |
759 | *pcyls = bs->cyls; | |
760 | *pheads = bs->heads; | |
761 | *psecs = bs->secs; | |
762 | } | |
763 | ||
764 | int bdrv_get_type_hint(BlockDriverState *bs) | |
765 | { | |
766 | return bs->type; | |
767 | } | |
768 | ||
46d4767d FB |
769 | int bdrv_get_translation_hint(BlockDriverState *bs) |
770 | { | |
771 | return bs->translation; | |
772 | } | |
773 | ||
b338082b FB |
774 | int bdrv_is_removable(BlockDriverState *bs) |
775 | { | |
776 | return bs->removable; | |
777 | } | |
778 | ||
779 | int bdrv_is_read_only(BlockDriverState *bs) | |
780 | { | |
781 | return bs->read_only; | |
782 | } | |
783 | ||
19cb3738 | 784 | /* XXX: no longer used */ |
5fafdf24 | 785 | void bdrv_set_change_cb(BlockDriverState *bs, |
b338082b FB |
786 | void (*change_cb)(void *opaque), void *opaque) |
787 | { | |
788 | bs->change_cb = change_cb; | |
789 | bs->change_opaque = opaque; | |
790 | } | |
791 | ||
ea2384d3 FB |
792 | int bdrv_is_encrypted(BlockDriverState *bs) |
793 | { | |
794 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
795 | return 1; | |
796 | return bs->encrypted; | |
797 | } | |
798 | ||
799 | int bdrv_set_key(BlockDriverState *bs, const char *key) | |
800 | { | |
801 | int ret; | |
802 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
803 | ret = bdrv_set_key(bs->backing_hd, key); | |
804 | if (ret < 0) | |
805 | return ret; | |
806 | if (!bs->encrypted) | |
807 | return 0; | |
808 | } | |
809 | if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key) | |
810 | return -1; | |
811 | return bs->drv->bdrv_set_key(bs, key); | |
812 | } | |
813 | ||
814 | void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) | |
815 | { | |
19cb3738 | 816 | if (!bs->drv) { |
ea2384d3 FB |
817 | buf[0] = '\0'; |
818 | } else { | |
819 | pstrcpy(buf, buf_size, bs->drv->format_name); | |
820 | } | |
821 | } | |
822 | ||
5fafdf24 | 823 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
ea2384d3 FB |
824 | void *opaque) |
825 | { | |
826 | BlockDriver *drv; | |
827 | ||
828 | for (drv = first_drv; drv != NULL; drv = drv->next) { | |
829 | it(opaque, drv->format_name); | |
830 | } | |
831 | } | |
832 | ||
b338082b FB |
833 | BlockDriverState *bdrv_find(const char *name) |
834 | { | |
835 | BlockDriverState *bs; | |
836 | ||
837 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
838 | if (!strcmp(name, bs->device_name)) | |
839 | return bs; | |
840 | } | |
841 | return NULL; | |
842 | } | |
843 | ||
81d0912d FB |
844 | void bdrv_iterate(void (*it)(void *opaque, const char *name), void *opaque) |
845 | { | |
846 | BlockDriverState *bs; | |
847 | ||
848 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
849 | it(opaque, bs->device_name); | |
850 | } | |
851 | } | |
852 | ||
ea2384d3 FB |
853 | const char *bdrv_get_device_name(BlockDriverState *bs) |
854 | { | |
855 | return bs->device_name; | |
856 | } | |
857 | ||
7a6cba61 PB |
858 | void bdrv_flush(BlockDriverState *bs) |
859 | { | |
860 | if (bs->drv->bdrv_flush) | |
861 | bs->drv->bdrv_flush(bs); | |
862 | if (bs->backing_hd) | |
863 | bdrv_flush(bs->backing_hd); | |
864 | } | |
865 | ||
faf07963 | 866 | #ifndef QEMU_IMG |
b338082b FB |
867 | void bdrv_info(void) |
868 | { | |
869 | BlockDriverState *bs; | |
870 | ||
871 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
872 | term_printf("%s:", bs->device_name); | |
873 | term_printf(" type="); | |
874 | switch(bs->type) { | |
875 | case BDRV_TYPE_HD: | |
876 | term_printf("hd"); | |
877 | break; | |
878 | case BDRV_TYPE_CDROM: | |
879 | term_printf("cdrom"); | |
880 | break; | |
881 | case BDRV_TYPE_FLOPPY: | |
882 | term_printf("floppy"); | |
883 | break; | |
884 | } | |
885 | term_printf(" removable=%d", bs->removable); | |
886 | if (bs->removable) { | |
887 | term_printf(" locked=%d", bs->locked); | |
888 | } | |
19cb3738 | 889 | if (bs->drv) { |
fef30743 TS |
890 | term_printf(" file="); |
891 | term_print_filename(bs->filename); | |
892 | if (bs->backing_file[0] != '\0') { | |
893 | term_printf(" backing_file="); | |
894 | term_print_filename(bs->backing_file); | |
895 | } | |
b338082b | 896 | term_printf(" ro=%d", bs->read_only); |
ea2384d3 FB |
897 | term_printf(" drv=%s", bs->drv->format_name); |
898 | if (bs->encrypted) | |
899 | term_printf(" encrypted"); | |
b338082b FB |
900 | } else { |
901 | term_printf(" [not inserted]"); | |
902 | } | |
903 | term_printf("\n"); | |
904 | } | |
905 | } | |
faf07963 | 906 | #endif |
ea2384d3 | 907 | |
5fafdf24 | 908 | void bdrv_get_backing_filename(BlockDriverState *bs, |
83f64091 FB |
909 | char *filename, int filename_size) |
910 | { | |
911 | if (!bs->backing_hd) { | |
912 | pstrcpy(filename, filename_size, ""); | |
913 | } else { | |
914 | pstrcpy(filename, filename_size, bs->backing_file); | |
915 | } | |
916 | } | |
917 | ||
5fafdf24 | 918 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
faea38e7 FB |
919 | const uint8_t *buf, int nb_sectors) |
920 | { | |
921 | BlockDriver *drv = bs->drv; | |
922 | if (!drv) | |
19cb3738 | 923 | return -ENOMEDIUM; |
faea38e7 FB |
924 | if (!drv->bdrv_write_compressed) |
925 | return -ENOTSUP; | |
926 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); | |
927 | } | |
3b46e624 | 928 | |
faea38e7 FB |
929 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
930 | { | |
931 | BlockDriver *drv = bs->drv; | |
932 | if (!drv) | |
19cb3738 | 933 | return -ENOMEDIUM; |
faea38e7 FB |
934 | if (!drv->bdrv_get_info) |
935 | return -ENOTSUP; | |
936 | memset(bdi, 0, sizeof(*bdi)); | |
937 | return drv->bdrv_get_info(bs, bdi); | |
938 | } | |
939 | ||
940 | /**************************************************************/ | |
941 | /* handling of snapshots */ | |
942 | ||
5fafdf24 | 943 | int bdrv_snapshot_create(BlockDriverState *bs, |
faea38e7 FB |
944 | QEMUSnapshotInfo *sn_info) |
945 | { | |
946 | BlockDriver *drv = bs->drv; | |
947 | if (!drv) | |
19cb3738 | 948 | return -ENOMEDIUM; |
faea38e7 FB |
949 | if (!drv->bdrv_snapshot_create) |
950 | return -ENOTSUP; | |
951 | return drv->bdrv_snapshot_create(bs, sn_info); | |
952 | } | |
953 | ||
5fafdf24 | 954 | int bdrv_snapshot_goto(BlockDriverState *bs, |
faea38e7 FB |
955 | const char *snapshot_id) |
956 | { | |
957 | BlockDriver *drv = bs->drv; | |
958 | if (!drv) | |
19cb3738 | 959 | return -ENOMEDIUM; |
faea38e7 FB |
960 | if (!drv->bdrv_snapshot_goto) |
961 | return -ENOTSUP; | |
962 | return drv->bdrv_snapshot_goto(bs, snapshot_id); | |
963 | } | |
964 | ||
965 | int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) | |
966 | { | |
967 | BlockDriver *drv = bs->drv; | |
968 | if (!drv) | |
19cb3738 | 969 | return -ENOMEDIUM; |
faea38e7 FB |
970 | if (!drv->bdrv_snapshot_delete) |
971 | return -ENOTSUP; | |
972 | return drv->bdrv_snapshot_delete(bs, snapshot_id); | |
973 | } | |
974 | ||
5fafdf24 | 975 | int bdrv_snapshot_list(BlockDriverState *bs, |
faea38e7 FB |
976 | QEMUSnapshotInfo **psn_info) |
977 | { | |
978 | BlockDriver *drv = bs->drv; | |
979 | if (!drv) | |
19cb3738 | 980 | return -ENOMEDIUM; |
faea38e7 FB |
981 | if (!drv->bdrv_snapshot_list) |
982 | return -ENOTSUP; | |
983 | return drv->bdrv_snapshot_list(bs, psn_info); | |
984 | } | |
985 | ||
986 | #define NB_SUFFIXES 4 | |
987 | ||
988 | char *get_human_readable_size(char *buf, int buf_size, int64_t size) | |
989 | { | |
990 | static const char suffixes[NB_SUFFIXES] = "KMGT"; | |
991 | int64_t base; | |
992 | int i; | |
993 | ||
994 | if (size <= 999) { | |
995 | snprintf(buf, buf_size, "%" PRId64, size); | |
996 | } else { | |
997 | base = 1024; | |
998 | for(i = 0; i < NB_SUFFIXES; i++) { | |
999 | if (size < (10 * base)) { | |
5fafdf24 | 1000 | snprintf(buf, buf_size, "%0.1f%c", |
faea38e7 FB |
1001 | (double)size / base, |
1002 | suffixes[i]); | |
1003 | break; | |
1004 | } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { | |
5fafdf24 | 1005 | snprintf(buf, buf_size, "%" PRId64 "%c", |
faea38e7 FB |
1006 | ((size + (base >> 1)) / base), |
1007 | suffixes[i]); | |
1008 | break; | |
1009 | } | |
1010 | base = base * 1024; | |
1011 | } | |
1012 | } | |
1013 | return buf; | |
1014 | } | |
1015 | ||
1016 | char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) | |
1017 | { | |
1018 | char buf1[128], date_buf[128], clock_buf[128]; | |
3b9f94e1 FB |
1019 | #ifdef _WIN32 |
1020 | struct tm *ptm; | |
1021 | #else | |
faea38e7 | 1022 | struct tm tm; |
3b9f94e1 | 1023 | #endif |
faea38e7 FB |
1024 | time_t ti; |
1025 | int64_t secs; | |
1026 | ||
1027 | if (!sn) { | |
5fafdf24 TS |
1028 | snprintf(buf, buf_size, |
1029 | "%-10s%-20s%7s%20s%15s", | |
faea38e7 FB |
1030 | "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
1031 | } else { | |
1032 | ti = sn->date_sec; | |
3b9f94e1 FB |
1033 | #ifdef _WIN32 |
1034 | ptm = localtime(&ti); | |
1035 | strftime(date_buf, sizeof(date_buf), | |
1036 | "%Y-%m-%d %H:%M:%S", ptm); | |
1037 | #else | |
faea38e7 FB |
1038 | localtime_r(&ti, &tm); |
1039 | strftime(date_buf, sizeof(date_buf), | |
1040 | "%Y-%m-%d %H:%M:%S", &tm); | |
3b9f94e1 | 1041 | #endif |
faea38e7 FB |
1042 | secs = sn->vm_clock_nsec / 1000000000; |
1043 | snprintf(clock_buf, sizeof(clock_buf), | |
1044 | "%02d:%02d:%02d.%03d", | |
1045 | (int)(secs / 3600), | |
1046 | (int)((secs / 60) % 60), | |
5fafdf24 | 1047 | (int)(secs % 60), |
faea38e7 FB |
1048 | (int)((sn->vm_clock_nsec / 1000000) % 1000)); |
1049 | snprintf(buf, buf_size, | |
5fafdf24 | 1050 | "%-10s%-20s%7s%20s%15s", |
faea38e7 FB |
1051 | sn->id_str, sn->name, |
1052 | get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), | |
1053 | date_buf, | |
1054 | clock_buf); | |
1055 | } | |
1056 | return buf; | |
1057 | } | |
1058 | ||
83f64091 | 1059 | |
ea2384d3 | 1060 | /**************************************************************/ |
83f64091 | 1061 | /* async I/Os */ |
ea2384d3 | 1062 | |
ce1a14dc PB |
1063 | BlockDriverAIOCB *bdrv_aio_read(BlockDriverState *bs, int64_t sector_num, |
1064 | uint8_t *buf, int nb_sectors, | |
1065 | BlockDriverCompletionFunc *cb, void *opaque) | |
83f64091 FB |
1066 | { |
1067 | BlockDriver *drv = bs->drv; | |
83f64091 | 1068 | |
19cb3738 | 1069 | if (!drv) |
ce1a14dc | 1070 | return NULL; |
3b46e624 | 1071 | |
83f64091 FB |
1072 | /* XXX: we assume that nb_sectors == 0 is suppored by the async read */ |
1073 | if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { | |
1074 | memcpy(buf, bs->boot_sector_data, 512); | |
1075 | sector_num++; | |
1076 | nb_sectors--; | |
1077 | buf += 512; | |
1078 | } | |
1079 | ||
ce1a14dc | 1080 | return drv->bdrv_aio_read(bs, sector_num, buf, nb_sectors, cb, opaque); |
ea2384d3 FB |
1081 | } |
1082 | ||
ce1a14dc PB |
1083 | BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num, |
1084 | const uint8_t *buf, int nb_sectors, | |
1085 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 1086 | { |
83f64091 | 1087 | BlockDriver *drv = bs->drv; |
ea2384d3 | 1088 | |
19cb3738 | 1089 | if (!drv) |
ce1a14dc | 1090 | return NULL; |
83f64091 | 1091 | if (bs->read_only) |
ce1a14dc | 1092 | return NULL; |
83f64091 | 1093 | if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) { |
3b46e624 | 1094 | memcpy(bs->boot_sector_data, buf, 512); |
ea2384d3 | 1095 | } |
83f64091 | 1096 | |
ce1a14dc | 1097 | return drv->bdrv_aio_write(bs, sector_num, buf, nb_sectors, cb, opaque); |
83f64091 FB |
1098 | } |
1099 | ||
1100 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) | |
83f64091 | 1101 | { |
ce1a14dc | 1102 | BlockDriver *drv = acb->bs->drv; |
83f64091 | 1103 | |
ce1a14dc | 1104 | drv->bdrv_aio_cancel(acb); |
83f64091 FB |
1105 | } |
1106 | ||
ce1a14dc | 1107 | |
83f64091 FB |
1108 | /**************************************************************/ |
1109 | /* async block device emulation */ | |
1110 | ||
faf07963 | 1111 | #ifdef QEMU_IMG |
ce1a14dc PB |
1112 | static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs, |
1113 | int64_t sector_num, uint8_t *buf, int nb_sectors, | |
1114 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 1115 | { |
ea2384d3 | 1116 | int ret; |
ce1a14dc PB |
1117 | ret = bdrv_read(bs, sector_num, buf, nb_sectors); |
1118 | cb(opaque, ret); | |
1119 | return NULL; | |
ea2384d3 FB |
1120 | } |
1121 | ||
ce1a14dc PB |
1122 | static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs, |
1123 | int64_t sector_num, const uint8_t *buf, int nb_sectors, | |
1124 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 1125 | { |
ea2384d3 | 1126 | int ret; |
ce1a14dc PB |
1127 | ret = bdrv_write(bs, sector_num, buf, nb_sectors); |
1128 | cb(opaque, ret); | |
1129 | return NULL; | |
ea2384d3 FB |
1130 | } |
1131 | ||
83f64091 | 1132 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb) |
ea2384d3 | 1133 | { |
ea2384d3 | 1134 | } |
83f64091 | 1135 | #else |
ce1a14dc | 1136 | static void bdrv_aio_bh_cb(void *opaque) |
83f64091 | 1137 | { |
ce1a14dc PB |
1138 | BlockDriverAIOCBSync *acb = opaque; |
1139 | acb->common.cb(acb->common.opaque, acb->ret); | |
1140 | qemu_aio_release(acb); | |
83f64091 | 1141 | } |
beac80cd | 1142 | |
ce1a14dc PB |
1143 | static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs, |
1144 | int64_t sector_num, uint8_t *buf, int nb_sectors, | |
1145 | BlockDriverCompletionFunc *cb, void *opaque) | |
83f64091 | 1146 | { |
ce1a14dc | 1147 | BlockDriverAIOCBSync *acb; |
83f64091 | 1148 | int ret; |
ce1a14dc PB |
1149 | |
1150 | acb = qemu_aio_get(bs, cb, opaque); | |
1151 | if (!acb->bh) | |
1152 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
1153 | ret = bdrv_read(bs, sector_num, buf, nb_sectors); | |
1154 | acb->ret = ret; | |
1155 | qemu_bh_schedule(acb->bh); | |
1156 | return &acb->common; | |
beac80cd FB |
1157 | } |
1158 | ||
ce1a14dc PB |
1159 | static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs, |
1160 | int64_t sector_num, const uint8_t *buf, int nb_sectors, | |
1161 | BlockDriverCompletionFunc *cb, void *opaque) | |
beac80cd | 1162 | { |
ce1a14dc | 1163 | BlockDriverAIOCBSync *acb; |
83f64091 | 1164 | int ret; |
83f64091 | 1165 | |
ce1a14dc PB |
1166 | acb = qemu_aio_get(bs, cb, opaque); |
1167 | if (!acb->bh) | |
1168 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
1169 | ret = bdrv_write(bs, sector_num, buf, nb_sectors); | |
1170 | acb->ret = ret; | |
1171 | qemu_bh_schedule(acb->bh); | |
1172 | return &acb->common; | |
beac80cd | 1173 | } |
beac80cd | 1174 | |
ce1a14dc | 1175 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) |
ea2384d3 | 1176 | { |
ce1a14dc PB |
1177 | BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb; |
1178 | qemu_bh_cancel(acb->bh); | |
1179 | qemu_aio_release(acb); | |
83f64091 | 1180 | } |
faf07963 | 1181 | #endif /* !QEMU_IMG */ |
ea2384d3 | 1182 | |
83f64091 FB |
1183 | /**************************************************************/ |
1184 | /* sync block device emulation */ | |
ea2384d3 | 1185 | |
83f64091 FB |
1186 | static void bdrv_rw_em_cb(void *opaque, int ret) |
1187 | { | |
1188 | *(int *)opaque = ret; | |
ea2384d3 FB |
1189 | } |
1190 | ||
83f64091 FB |
1191 | #define NOT_DONE 0x7fffffff |
1192 | ||
5fafdf24 | 1193 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
83f64091 | 1194 | uint8_t *buf, int nb_sectors) |
7a6cba61 | 1195 | { |
ce1a14dc PB |
1196 | int async_ret; |
1197 | BlockDriverAIOCB *acb; | |
83f64091 | 1198 | |
83f64091 FB |
1199 | async_ret = NOT_DONE; |
1200 | qemu_aio_wait_start(); | |
5fafdf24 | 1201 | acb = bdrv_aio_read(bs, sector_num, buf, nb_sectors, |
83f64091 | 1202 | bdrv_rw_em_cb, &async_ret); |
ce1a14dc | 1203 | if (acb == NULL) { |
83f64091 | 1204 | qemu_aio_wait_end(); |
ce1a14dc | 1205 | return -1; |
83f64091 FB |
1206 | } |
1207 | while (async_ret == NOT_DONE) { | |
1208 | qemu_aio_wait(); | |
1209 | } | |
1210 | qemu_aio_wait_end(); | |
1211 | return async_ret; | |
7a6cba61 PB |
1212 | } |
1213 | ||
83f64091 FB |
1214 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
1215 | const uint8_t *buf, int nb_sectors) | |
1216 | { | |
ce1a14dc PB |
1217 | int async_ret; |
1218 | BlockDriverAIOCB *acb; | |
83f64091 | 1219 | |
83f64091 FB |
1220 | async_ret = NOT_DONE; |
1221 | qemu_aio_wait_start(); | |
5fafdf24 | 1222 | acb = bdrv_aio_write(bs, sector_num, buf, nb_sectors, |
83f64091 | 1223 | bdrv_rw_em_cb, &async_ret); |
ce1a14dc | 1224 | if (acb == NULL) { |
83f64091 | 1225 | qemu_aio_wait_end(); |
ce1a14dc | 1226 | return -1; |
83f64091 FB |
1227 | } |
1228 | while (async_ret == NOT_DONE) { | |
1229 | qemu_aio_wait(); | |
1230 | } | |
1231 | qemu_aio_wait_end(); | |
1232 | return async_ret; | |
1233 | } | |
ea2384d3 FB |
1234 | |
1235 | void bdrv_init(void) | |
1236 | { | |
1237 | bdrv_register(&bdrv_raw); | |
19cb3738 | 1238 | bdrv_register(&bdrv_host_device); |
ea2384d3 FB |
1239 | #ifndef _WIN32 |
1240 | bdrv_register(&bdrv_cow); | |
1241 | #endif | |
1242 | bdrv_register(&bdrv_qcow); | |
1243 | bdrv_register(&bdrv_vmdk); | |
3c56521b | 1244 | bdrv_register(&bdrv_cloop); |
585d0ed9 | 1245 | bdrv_register(&bdrv_dmg); |
a8753c34 | 1246 | bdrv_register(&bdrv_bochs); |
6a0f9e82 | 1247 | bdrv_register(&bdrv_vpc); |
712e7874 | 1248 | bdrv_register(&bdrv_vvfat); |
faea38e7 | 1249 | bdrv_register(&bdrv_qcow2); |
6ada7453 | 1250 | bdrv_register(&bdrv_parallels); |
ea2384d3 | 1251 | } |
ce1a14dc PB |
1252 | |
1253 | void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb, | |
1254 | void *opaque) | |
1255 | { | |
1256 | BlockDriver *drv; | |
1257 | BlockDriverAIOCB *acb; | |
1258 | ||
1259 | drv = bs->drv; | |
1260 | if (drv->free_aiocb) { | |
1261 | acb = drv->free_aiocb; | |
1262 | drv->free_aiocb = acb->next; | |
1263 | } else { | |
1264 | acb = qemu_mallocz(drv->aiocb_size); | |
1265 | if (!acb) | |
1266 | return NULL; | |
1267 | } | |
1268 | acb->bs = bs; | |
1269 | acb->cb = cb; | |
1270 | acb->opaque = opaque; | |
1271 | return acb; | |
1272 | } | |
1273 | ||
1274 | void qemu_aio_release(void *p) | |
1275 | { | |
1276 | BlockDriverAIOCB *acb = p; | |
1277 | BlockDriver *drv = acb->bs->drv; | |
1278 | acb->next = drv->free_aiocb; | |
1279 | drv->free_aiocb = acb; | |
1280 | } | |
19cb3738 FB |
1281 | |
1282 | /**************************************************************/ | |
1283 | /* removable device support */ | |
1284 | ||
1285 | /** | |
1286 | * Return TRUE if the media is present | |
1287 | */ | |
1288 | int bdrv_is_inserted(BlockDriverState *bs) | |
1289 | { | |
1290 | BlockDriver *drv = bs->drv; | |
1291 | int ret; | |
1292 | if (!drv) | |
1293 | return 0; | |
1294 | if (!drv->bdrv_is_inserted) | |
1295 | return 1; | |
1296 | ret = drv->bdrv_is_inserted(bs); | |
1297 | return ret; | |
1298 | } | |
1299 | ||
1300 | /** | |
1301 | * Return TRUE if the media changed since the last call to this | |
5fafdf24 | 1302 | * function. It is currently only used for floppy disks |
19cb3738 FB |
1303 | */ |
1304 | int bdrv_media_changed(BlockDriverState *bs) | |
1305 | { | |
1306 | BlockDriver *drv = bs->drv; | |
1307 | int ret; | |
1308 | ||
1309 | if (!drv || !drv->bdrv_media_changed) | |
1310 | ret = -ENOTSUP; | |
1311 | else | |
1312 | ret = drv->bdrv_media_changed(bs); | |
1313 | if (ret == -ENOTSUP) | |
1314 | ret = bs->media_changed; | |
1315 | bs->media_changed = 0; | |
1316 | return ret; | |
1317 | } | |
1318 | ||
1319 | /** | |
1320 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
1321 | */ | |
1322 | void bdrv_eject(BlockDriverState *bs, int eject_flag) | |
1323 | { | |
1324 | BlockDriver *drv = bs->drv; | |
1325 | int ret; | |
1326 | ||
1327 | if (!drv || !drv->bdrv_eject) { | |
1328 | ret = -ENOTSUP; | |
1329 | } else { | |
1330 | ret = drv->bdrv_eject(bs, eject_flag); | |
1331 | } | |
1332 | if (ret == -ENOTSUP) { | |
1333 | if (eject_flag) | |
1334 | bdrv_close(bs); | |
1335 | } | |
1336 | } | |
1337 | ||
1338 | int bdrv_is_locked(BlockDriverState *bs) | |
1339 | { | |
1340 | return bs->locked; | |
1341 | } | |
1342 | ||
1343 | /** | |
1344 | * Lock or unlock the media (if it is locked, the user won't be able | |
1345 | * to eject it manually). | |
1346 | */ | |
1347 | void bdrv_set_locked(BlockDriverState *bs, int locked) | |
1348 | { | |
1349 | BlockDriver *drv = bs->drv; | |
1350 | ||
1351 | bs->locked = locked; | |
1352 | if (drv && drv->bdrv_set_locked) { | |
1353 | drv->bdrv_set_locked(bs, locked); | |
1354 | } | |
1355 | } |