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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 | 25 | #include "console.h" |
ea2384d3 | 26 | #include "block_int.h" |
fc01f7e7 | 27 | |
7674e7bf FB |
28 | #ifdef _BSD |
29 | #include <sys/types.h> | |
30 | #include <sys/stat.h> | |
31 | #include <sys/ioctl.h> | |
32 | #include <sys/queue.h> | |
33 | #include <sys/disk.h> | |
34 | #endif | |
35 | ||
83f64091 FB |
36 | #define SECTOR_BITS 9 |
37 | #define SECTOR_SIZE (1 << SECTOR_BITS) | |
38 | ||
90765429 FB |
39 | typedef struct BlockDriverAIOCBSync { |
40 | BlockDriverAIOCB common; | |
41 | QEMUBH *bh; | |
42 | int ret; | |
43 | } BlockDriverAIOCBSync; | |
44 | ||
ce1a14dc PB |
45 | static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs, |
46 | int64_t sector_num, uint8_t *buf, int nb_sectors, | |
47 | BlockDriverCompletionFunc *cb, void *opaque); | |
48 | static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs, | |
49 | int64_t sector_num, const uint8_t *buf, int nb_sectors, | |
50 | BlockDriverCompletionFunc *cb, void *opaque); | |
83f64091 | 51 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb); |
5fafdf24 | 52 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
83f64091 FB |
53 | uint8_t *buf, int nb_sectors); |
54 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, | |
55 | const uint8_t *buf, int nb_sectors); | |
ec530c81 | 56 | |
7ee930d0 BS |
57 | BlockDriverState *bdrv_first; |
58 | ||
ea2384d3 FB |
59 | static BlockDriver *first_drv; |
60 | ||
83f64091 | 61 | int path_is_absolute(const char *path) |
3b0d4f61 | 62 | { |
83f64091 | 63 | const char *p; |
21664424 FB |
64 | #ifdef _WIN32 |
65 | /* specific case for names like: "\\.\d:" */ | |
66 | if (*path == '/' || *path == '\\') | |
67 | return 1; | |
68 | #endif | |
83f64091 FB |
69 | p = strchr(path, ':'); |
70 | if (p) | |
71 | p++; | |
72 | else | |
73 | p = path; | |
3b9f94e1 FB |
74 | #ifdef _WIN32 |
75 | return (*p == '/' || *p == '\\'); | |
76 | #else | |
77 | return (*p == '/'); | |
78 | #endif | |
3b0d4f61 FB |
79 | } |
80 | ||
83f64091 FB |
81 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
82 | path to it by considering it is relative to base_path. URL are | |
83 | supported. */ | |
84 | void path_combine(char *dest, int dest_size, | |
85 | const char *base_path, | |
86 | const char *filename) | |
3b0d4f61 | 87 | { |
83f64091 FB |
88 | const char *p, *p1; |
89 | int len; | |
90 | ||
91 | if (dest_size <= 0) | |
92 | return; | |
93 | if (path_is_absolute(filename)) { | |
94 | pstrcpy(dest, dest_size, filename); | |
95 | } else { | |
96 | p = strchr(base_path, ':'); | |
97 | if (p) | |
98 | p++; | |
99 | else | |
100 | p = base_path; | |
3b9f94e1 FB |
101 | p1 = strrchr(base_path, '/'); |
102 | #ifdef _WIN32 | |
103 | { | |
104 | const char *p2; | |
105 | p2 = strrchr(base_path, '\\'); | |
106 | if (!p1 || p2 > p1) | |
107 | p1 = p2; | |
108 | } | |
109 | #endif | |
83f64091 FB |
110 | if (p1) |
111 | p1++; | |
112 | else | |
113 | p1 = base_path; | |
114 | if (p1 > p) | |
115 | p = p1; | |
116 | len = p - base_path; | |
117 | if (len > dest_size - 1) | |
118 | len = dest_size - 1; | |
119 | memcpy(dest, base_path, len); | |
120 | dest[len] = '\0'; | |
121 | pstrcat(dest, dest_size, filename); | |
3b0d4f61 | 122 | } |
3b0d4f61 FB |
123 | } |
124 | ||
3b0d4f61 | 125 | |
9596ebb7 | 126 | static void bdrv_register(BlockDriver *bdrv) |
ea2384d3 | 127 | { |
ce1a14dc | 128 | if (!bdrv->bdrv_aio_read) { |
83f64091 | 129 | /* add AIO emulation layer */ |
83f64091 FB |
130 | bdrv->bdrv_aio_read = bdrv_aio_read_em; |
131 | bdrv->bdrv_aio_write = bdrv_aio_write_em; | |
132 | bdrv->bdrv_aio_cancel = bdrv_aio_cancel_em; | |
90765429 | 133 | bdrv->aiocb_size = sizeof(BlockDriverAIOCBSync); |
83f64091 FB |
134 | } else if (!bdrv->bdrv_read && !bdrv->bdrv_pread) { |
135 | /* add synchronous IO emulation layer */ | |
136 | bdrv->bdrv_read = bdrv_read_em; | |
137 | bdrv->bdrv_write = bdrv_write_em; | |
138 | } | |
ea2384d3 FB |
139 | bdrv->next = first_drv; |
140 | first_drv = bdrv; | |
141 | } | |
b338082b FB |
142 | |
143 | /* create a new block device (by default it is empty) */ | |
144 | BlockDriverState *bdrv_new(const char *device_name) | |
145 | { | |
146 | BlockDriverState **pbs, *bs; | |
147 | ||
148 | bs = qemu_mallocz(sizeof(BlockDriverState)); | |
149 | if(!bs) | |
150 | return NULL; | |
151 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); | |
ea2384d3 FB |
152 | if (device_name[0] != '\0') { |
153 | /* insert at the end */ | |
154 | pbs = &bdrv_first; | |
155 | while (*pbs != NULL) | |
156 | pbs = &(*pbs)->next; | |
157 | *pbs = bs; | |
158 | } | |
b338082b FB |
159 | return bs; |
160 | } | |
161 | ||
ea2384d3 FB |
162 | BlockDriver *bdrv_find_format(const char *format_name) |
163 | { | |
164 | BlockDriver *drv1; | |
165 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { | |
166 | if (!strcmp(drv1->format_name, format_name)) | |
167 | return drv1; | |
168 | } | |
169 | return NULL; | |
170 | } | |
171 | ||
5fafdf24 | 172 | int bdrv_create(BlockDriver *drv, |
ea2384d3 FB |
173 | const char *filename, int64_t size_in_sectors, |
174 | const char *backing_file, int flags) | |
175 | { | |
176 | if (!drv->bdrv_create) | |
177 | return -ENOTSUP; | |
178 | return drv->bdrv_create(filename, size_in_sectors, backing_file, flags); | |
179 | } | |
180 | ||
d5249393 | 181 | #ifdef _WIN32 |
95389c86 | 182 | void get_tmp_filename(char *filename, int size) |
d5249393 | 183 | { |
3b9f94e1 | 184 | char temp_dir[MAX_PATH]; |
3b46e624 | 185 | |
3b9f94e1 FB |
186 | GetTempPath(MAX_PATH, temp_dir); |
187 | GetTempFileName(temp_dir, "qem", 0, filename); | |
d5249393 FB |
188 | } |
189 | #else | |
95389c86 | 190 | void get_tmp_filename(char *filename, int size) |
fc01f7e7 | 191 | { |
67b915a5 | 192 | int fd; |
7ccfb2eb | 193 | const char *tmpdir; |
d5249393 | 194 | /* XXX: race condition possible */ |
0badc1ee AJ |
195 | tmpdir = getenv("TMPDIR"); |
196 | if (!tmpdir) | |
197 | tmpdir = "/tmp"; | |
198 | snprintf(filename, size, "%s/vl.XXXXXX", tmpdir); | |
ea2384d3 FB |
199 | fd = mkstemp(filename); |
200 | close(fd); | |
201 | } | |
d5249393 | 202 | #endif |
fc01f7e7 | 203 | |
19cb3738 | 204 | #ifdef _WIN32 |
f45512fe FB |
205 | static int is_windows_drive_prefix(const char *filename) |
206 | { | |
207 | return (((filename[0] >= 'a' && filename[0] <= 'z') || | |
208 | (filename[0] >= 'A' && filename[0] <= 'Z')) && | |
209 | filename[1] == ':'); | |
210 | } | |
3b46e624 | 211 | |
19cb3738 FB |
212 | static int is_windows_drive(const char *filename) |
213 | { | |
5fafdf24 | 214 | if (is_windows_drive_prefix(filename) && |
f45512fe | 215 | filename[2] == '\0') |
19cb3738 FB |
216 | return 1; |
217 | if (strstart(filename, "\\\\.\\", NULL) || | |
218 | strstart(filename, "//./", NULL)) | |
219 | return 1; | |
220 | return 0; | |
221 | } | |
222 | #endif | |
223 | ||
83f64091 FB |
224 | static BlockDriver *find_protocol(const char *filename) |
225 | { | |
226 | BlockDriver *drv1; | |
227 | char protocol[128]; | |
228 | int len; | |
229 | const char *p; | |
19cb3738 FB |
230 | |
231 | #ifdef _WIN32 | |
f45512fe FB |
232 | if (is_windows_drive(filename) || |
233 | is_windows_drive_prefix(filename)) | |
19cb3738 FB |
234 | return &bdrv_raw; |
235 | #endif | |
83f64091 FB |
236 | p = strchr(filename, ':'); |
237 | if (!p) | |
238 | return &bdrv_raw; | |
239 | len = p - filename; | |
240 | if (len > sizeof(protocol) - 1) | |
241 | len = sizeof(protocol) - 1; | |
83f64091 FB |
242 | memcpy(protocol, filename, len); |
243 | protocol[len] = '\0'; | |
244 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { | |
5fafdf24 | 245 | if (drv1->protocol_name && |
83f64091 FB |
246 | !strcmp(drv1->protocol_name, protocol)) |
247 | return drv1; | |
248 | } | |
249 | return NULL; | |
250 | } | |
251 | ||
7674e7bf FB |
252 | /* XXX: force raw format if block or character device ? It would |
253 | simplify the BSD case */ | |
ea2384d3 FB |
254 | static BlockDriver *find_image_format(const char *filename) |
255 | { | |
83f64091 | 256 | int ret, score, score_max; |
ea2384d3 | 257 | BlockDriver *drv1, *drv; |
83f64091 FB |
258 | uint8_t buf[2048]; |
259 | BlockDriverState *bs; | |
3b46e624 | 260 | |
19cb3738 FB |
261 | /* detect host devices. By convention, /dev/cdrom[N] is always |
262 | recognized as a host CDROM */ | |
263 | if (strstart(filename, "/dev/cdrom", NULL)) | |
264 | return &bdrv_host_device; | |
265 | #ifdef _WIN32 | |
266 | if (is_windows_drive(filename)) | |
267 | return &bdrv_host_device; | |
268 | #else | |
269 | { | |
270 | struct stat st; | |
5fafdf24 | 271 | if (stat(filename, &st) >= 0 && |
19cb3738 FB |
272 | (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) { |
273 | return &bdrv_host_device; | |
274 | } | |
275 | } | |
276 | #endif | |
3b46e624 | 277 | |
83f64091 | 278 | drv = find_protocol(filename); |
19cb3738 | 279 | /* no need to test disk image formats for vvfat */ |
83f64091 FB |
280 | if (drv == &bdrv_vvfat) |
281 | return drv; | |
19cb3738 | 282 | |
83f64091 FB |
283 | ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY); |
284 | if (ret < 0) | |
285 | return NULL; | |
286 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); | |
287 | bdrv_delete(bs); | |
288 | if (ret < 0) { | |
289 | return NULL; | |
290 | } | |
291 | ||
ea2384d3 FB |
292 | score_max = 0; |
293 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { | |
83f64091 FB |
294 | if (drv1->bdrv_probe) { |
295 | score = drv1->bdrv_probe(buf, ret, filename); | |
296 | if (score > score_max) { | |
297 | score_max = score; | |
298 | drv = drv1; | |
299 | } | |
0849bf08 | 300 | } |
fc01f7e7 | 301 | } |
ea2384d3 FB |
302 | return drv; |
303 | } | |
304 | ||
83f64091 | 305 | int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
ea2384d3 | 306 | { |
83f64091 FB |
307 | BlockDriverState *bs; |
308 | int ret; | |
309 | ||
310 | bs = bdrv_new(""); | |
311 | if (!bs) | |
312 | return -ENOMEM; | |
313 | ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL); | |
314 | if (ret < 0) { | |
315 | bdrv_delete(bs); | |
316 | return ret; | |
3b0d4f61 | 317 | } |
83f64091 FB |
318 | *pbs = bs; |
319 | return 0; | |
320 | } | |
321 | ||
322 | int bdrv_open(BlockDriverState *bs, const char *filename, int flags) | |
323 | { | |
324 | return bdrv_open2(bs, filename, flags, NULL); | |
ea2384d3 FB |
325 | } |
326 | ||
83f64091 | 327 | int bdrv_open2(BlockDriverState *bs, const char *filename, int flags, |
ea2384d3 FB |
328 | BlockDriver *drv) |
329 | { | |
83f64091 | 330 | int ret, open_flags; |
eb5c851f TS |
331 | char tmp_filename[PATH_MAX]; |
332 | char backing_filename[PATH_MAX]; | |
3b46e624 | 333 | |
ea2384d3 FB |
334 | bs->read_only = 0; |
335 | bs->is_temporary = 0; | |
336 | bs->encrypted = 0; | |
712e7874 | 337 | |
83f64091 | 338 | if (flags & BDRV_O_SNAPSHOT) { |
ea2384d3 FB |
339 | BlockDriverState *bs1; |
340 | int64_t total_size; | |
7c96d46e | 341 | int is_protocol = 0; |
3b46e624 | 342 | |
ea2384d3 FB |
343 | /* if snapshot, we create a temporary backing file and open it |
344 | instead of opening 'filename' directly */ | |
33e3963e | 345 | |
ea2384d3 FB |
346 | /* if there is a backing file, use it */ |
347 | bs1 = bdrv_new(""); | |
348 | if (!bs1) { | |
83f64091 | 349 | return -ENOMEM; |
ea2384d3 FB |
350 | } |
351 | if (bdrv_open(bs1, filename, 0) < 0) { | |
352 | bdrv_delete(bs1); | |
353 | return -1; | |
354 | } | |
83f64091 | 355 | total_size = bdrv_getlength(bs1) >> SECTOR_BITS; |
7c96d46e AL |
356 | |
357 | if (bs1->drv && bs1->drv->protocol_name) | |
358 | is_protocol = 1; | |
359 | ||
ea2384d3 | 360 | bdrv_delete(bs1); |
3b46e624 | 361 | |
ea2384d3 | 362 | get_tmp_filename(tmp_filename, sizeof(tmp_filename)); |
7c96d46e AL |
363 | |
364 | /* Real path is meaningless for protocols */ | |
365 | if (is_protocol) | |
366 | snprintf(backing_filename, sizeof(backing_filename), | |
367 | "%s", filename); | |
368 | else | |
369 | realpath(filename, backing_filename); | |
370 | ||
5fafdf24 | 371 | if (bdrv_create(&bdrv_qcow2, tmp_filename, |
a817d936 | 372 | total_size, backing_filename, 0) < 0) { |
ea2384d3 FB |
373 | return -1; |
374 | } | |
375 | filename = tmp_filename; | |
376 | bs->is_temporary = 1; | |
377 | } | |
712e7874 | 378 | |
ea2384d3 | 379 | pstrcpy(bs->filename, sizeof(bs->filename), filename); |
83f64091 FB |
380 | if (flags & BDRV_O_FILE) { |
381 | drv = find_protocol(filename); | |
ea2384d3 | 382 | if (!drv) |
83f64091 FB |
383 | return -ENOENT; |
384 | } else { | |
385 | if (!drv) { | |
386 | drv = find_image_format(filename); | |
387 | if (!drv) | |
388 | return -1; | |
389 | } | |
ea2384d3 FB |
390 | } |
391 | bs->drv = drv; | |
392 | bs->opaque = qemu_mallocz(drv->instance_size); | |
393 | if (bs->opaque == NULL && drv->instance_size > 0) | |
394 | return -1; | |
83f64091 FB |
395 | /* Note: for compatibility, we open disk image files as RDWR, and |
396 | RDONLY as fallback */ | |
397 | if (!(flags & BDRV_O_FILE)) | |
9f7965c7 | 398 | open_flags = BDRV_O_RDWR | (flags & BDRV_O_CACHE_MASK); |
83f64091 FB |
399 | else |
400 | open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT); | |
401 | ret = drv->bdrv_open(bs, filename, open_flags); | |
a0a83536 | 402 | if ((ret == -EACCES || ret == -EPERM) && !(flags & BDRV_O_FILE)) { |
9f7965c7 | 403 | ret = drv->bdrv_open(bs, filename, open_flags & ~BDRV_O_RDWR); |
83f64091 FB |
404 | bs->read_only = 1; |
405 | } | |
ea2384d3 FB |
406 | if (ret < 0) { |
407 | qemu_free(bs->opaque); | |
6b21b973 FB |
408 | bs->opaque = NULL; |
409 | bs->drv = NULL; | |
83f64091 | 410 | return ret; |
33e3963e | 411 | } |
d15a771d FB |
412 | if (drv->bdrv_getlength) { |
413 | bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; | |
414 | } | |
67b915a5 | 415 | #ifndef _WIN32 |
ea2384d3 FB |
416 | if (bs->is_temporary) { |
417 | unlink(filename); | |
418 | } | |
419 | #endif | |
83f64091 | 420 | if (bs->backing_file[0] != '\0') { |
ea2384d3 FB |
421 | /* if there is a backing file, use it */ |
422 | bs->backing_hd = bdrv_new(""); | |
423 | if (!bs->backing_hd) { | |
424 | fail: | |
425 | bdrv_close(bs); | |
6b21b973 | 426 | return -ENOMEM; |
33e3963e | 427 | } |
83f64091 FB |
428 | path_combine(backing_filename, sizeof(backing_filename), |
429 | filename, bs->backing_file); | |
9f7965c7 | 430 | if (bdrv_open(bs->backing_hd, backing_filename, open_flags) < 0) |
33e3963e | 431 | goto fail; |
33e3963e FB |
432 | } |
433 | ||
b338082b | 434 | /* call the change callback */ |
19cb3738 | 435 | bs->media_changed = 1; |
b338082b FB |
436 | if (bs->change_cb) |
437 | bs->change_cb(bs->change_opaque); | |
438 | ||
439 | return 0; | |
fc01f7e7 FB |
440 | } |
441 | ||
442 | void bdrv_close(BlockDriverState *bs) | |
443 | { | |
19cb3738 | 444 | if (bs->drv) { |
ea2384d3 FB |
445 | if (bs->backing_hd) |
446 | bdrv_delete(bs->backing_hd); | |
447 | bs->drv->bdrv_close(bs); | |
448 | qemu_free(bs->opaque); | |
449 | #ifdef _WIN32 | |
450 | if (bs->is_temporary) { | |
451 | unlink(bs->filename); | |
452 | } | |
67b915a5 | 453 | #endif |
ea2384d3 FB |
454 | bs->opaque = NULL; |
455 | bs->drv = NULL; | |
b338082b FB |
456 | |
457 | /* call the change callback */ | |
19cb3738 | 458 | bs->media_changed = 1; |
b338082b FB |
459 | if (bs->change_cb) |
460 | bs->change_cb(bs->change_opaque); | |
461 | } | |
462 | } | |
463 | ||
464 | void bdrv_delete(BlockDriverState *bs) | |
465 | { | |
34c6f050 AJ |
466 | BlockDriverState **pbs; |
467 | ||
468 | pbs = &bdrv_first; | |
469 | while (*pbs != bs && *pbs != NULL) | |
470 | pbs = &(*pbs)->next; | |
471 | if (*pbs == bs) | |
472 | *pbs = bs->next; | |
473 | ||
b338082b FB |
474 | bdrv_close(bs); |
475 | qemu_free(bs); | |
fc01f7e7 FB |
476 | } |
477 | ||
33e3963e FB |
478 | /* commit COW file into the raw image */ |
479 | int bdrv_commit(BlockDriverState *bs) | |
480 | { | |
19cb3738 | 481 | BlockDriver *drv = bs->drv; |
83f64091 | 482 | int64_t i, total_sectors; |
ea2384d3 FB |
483 | int n, j; |
484 | unsigned char sector[512]; | |
33e3963e | 485 | |
19cb3738 FB |
486 | if (!drv) |
487 | return -ENOMEDIUM; | |
33e3963e FB |
488 | |
489 | if (bs->read_only) { | |
ea2384d3 | 490 | return -EACCES; |
33e3963e FB |
491 | } |
492 | ||
ea2384d3 FB |
493 | if (!bs->backing_hd) { |
494 | return -ENOTSUP; | |
495 | } | |
33e3963e | 496 | |
83f64091 FB |
497 | total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
498 | for (i = 0; i < total_sectors;) { | |
19cb3738 | 499 | if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { |
ea2384d3 FB |
500 | for(j = 0; j < n; j++) { |
501 | if (bdrv_read(bs, i, sector, 1) != 0) { | |
502 | return -EIO; | |
503 | } | |
504 | ||
505 | if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { | |
506 | return -EIO; | |
507 | } | |
508 | i++; | |
33e3963e | 509 | } |
ea2384d3 FB |
510 | } else { |
511 | i += n; | |
512 | } | |
33e3963e | 513 | } |
95389c86 | 514 | |
19cb3738 FB |
515 | if (drv->bdrv_make_empty) |
516 | return drv->bdrv_make_empty(bs); | |
95389c86 | 517 | |
33e3963e FB |
518 | return 0; |
519 | } | |
520 | ||
19cb3738 | 521 | /* return < 0 if error. See bdrv_write() for the return codes */ |
5fafdf24 | 522 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
523 | uint8_t *buf, int nb_sectors) |
524 | { | |
ea2384d3 FB |
525 | BlockDriver *drv = bs->drv; |
526 | ||
19cb3738 FB |
527 | if (!drv) |
528 | return -ENOMEDIUM; | |
b338082b | 529 | |
83f64091 FB |
530 | if (drv->bdrv_pread) { |
531 | int ret, len; | |
532 | len = nb_sectors * 512; | |
533 | ret = drv->bdrv_pread(bs, sector_num * 512, buf, len); | |
534 | if (ret < 0) | |
535 | return ret; | |
536 | else if (ret != len) | |
19cb3738 | 537 | return -EINVAL; |
a36e69dd TS |
538 | else { |
539 | bs->rd_bytes += (unsigned) len; | |
540 | bs->rd_ops ++; | |
83f64091 | 541 | return 0; |
a36e69dd | 542 | } |
83f64091 FB |
543 | } else { |
544 | return drv->bdrv_read(bs, sector_num, buf, nb_sectors); | |
33e3963e | 545 | } |
fc01f7e7 FB |
546 | } |
547 | ||
5fafdf24 | 548 | /* Return < 0 if error. Important errors are: |
19cb3738 FB |
549 | -EIO generic I/O error (may happen for all errors) |
550 | -ENOMEDIUM No media inserted. | |
551 | -EINVAL Invalid sector number or nb_sectors | |
552 | -EACCES Trying to write a read-only device | |
553 | */ | |
5fafdf24 | 554 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
555 | const uint8_t *buf, int nb_sectors) |
556 | { | |
83f64091 | 557 | BlockDriver *drv = bs->drv; |
19cb3738 FB |
558 | if (!bs->drv) |
559 | return -ENOMEDIUM; | |
0849bf08 | 560 | if (bs->read_only) |
19cb3738 | 561 | return -EACCES; |
83f64091 FB |
562 | if (drv->bdrv_pwrite) { |
563 | int ret, len; | |
564 | len = nb_sectors * 512; | |
565 | ret = drv->bdrv_pwrite(bs, sector_num * 512, buf, len); | |
566 | if (ret < 0) | |
567 | return ret; | |
568 | else if (ret != len) | |
569 | return -EIO; | |
a36e69dd TS |
570 | else { |
571 | bs->wr_bytes += (unsigned) len; | |
572 | bs->wr_ops ++; | |
83f64091 | 573 | return 0; |
a36e69dd | 574 | } |
83f64091 FB |
575 | } else { |
576 | return drv->bdrv_write(bs, sector_num, buf, nb_sectors); | |
577 | } | |
578 | } | |
579 | ||
5fafdf24 | 580 | static int bdrv_pread_em(BlockDriverState *bs, int64_t offset, |
faea38e7 | 581 | uint8_t *buf, int count1) |
83f64091 | 582 | { |
83f64091 FB |
583 | uint8_t tmp_buf[SECTOR_SIZE]; |
584 | int len, nb_sectors, count; | |
585 | int64_t sector_num; | |
586 | ||
587 | count = count1; | |
588 | /* first read to align to sector start */ | |
589 | len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1); | |
590 | if (len > count) | |
591 | len = count; | |
592 | sector_num = offset >> SECTOR_BITS; | |
593 | if (len > 0) { | |
594 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
595 | return -EIO; | |
596 | memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len); | |
597 | count -= len; | |
598 | if (count == 0) | |
599 | return count1; | |
600 | sector_num++; | |
601 | buf += len; | |
602 | } | |
603 | ||
604 | /* read the sectors "in place" */ | |
605 | nb_sectors = count >> SECTOR_BITS; | |
606 | if (nb_sectors > 0) { | |
607 | if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0) | |
608 | return -EIO; | |
609 | sector_num += nb_sectors; | |
610 | len = nb_sectors << SECTOR_BITS; | |
611 | buf += len; | |
612 | count -= len; | |
613 | } | |
614 | ||
615 | /* add data from the last sector */ | |
616 | if (count > 0) { | |
617 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
618 | return -EIO; | |
619 | memcpy(buf, tmp_buf, count); | |
620 | } | |
621 | return count1; | |
622 | } | |
623 | ||
5fafdf24 | 624 | static int bdrv_pwrite_em(BlockDriverState *bs, int64_t offset, |
faea38e7 | 625 | const uint8_t *buf, int count1) |
83f64091 | 626 | { |
83f64091 FB |
627 | uint8_t tmp_buf[SECTOR_SIZE]; |
628 | int len, nb_sectors, count; | |
629 | int64_t sector_num; | |
630 | ||
631 | count = count1; | |
632 | /* first write to align to sector start */ | |
633 | len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1); | |
634 | if (len > count) | |
635 | len = count; | |
636 | sector_num = offset >> SECTOR_BITS; | |
637 | if (len > 0) { | |
638 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
639 | return -EIO; | |
640 | memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len); | |
641 | if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) | |
642 | return -EIO; | |
643 | count -= len; | |
644 | if (count == 0) | |
645 | return count1; | |
646 | sector_num++; | |
647 | buf += len; | |
648 | } | |
649 | ||
650 | /* write the sectors "in place" */ | |
651 | nb_sectors = count >> SECTOR_BITS; | |
652 | if (nb_sectors > 0) { | |
653 | if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0) | |
654 | return -EIO; | |
655 | sector_num += nb_sectors; | |
656 | len = nb_sectors << SECTOR_BITS; | |
657 | buf += len; | |
658 | count -= len; | |
659 | } | |
660 | ||
661 | /* add data from the last sector */ | |
662 | if (count > 0) { | |
663 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
664 | return -EIO; | |
665 | memcpy(tmp_buf, buf, count); | |
666 | if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) | |
667 | return -EIO; | |
668 | } | |
669 | return count1; | |
670 | } | |
83f64091 FB |
671 | |
672 | /** | |
5fafdf24 | 673 | * Read with byte offsets (needed only for file protocols) |
83f64091 | 674 | */ |
5fafdf24 | 675 | int bdrv_pread(BlockDriverState *bs, int64_t offset, |
83f64091 FB |
676 | void *buf1, int count1) |
677 | { | |
678 | BlockDriver *drv = bs->drv; | |
679 | ||
680 | if (!drv) | |
19cb3738 | 681 | return -ENOMEDIUM; |
83f64091 | 682 | if (!drv->bdrv_pread) |
faea38e7 | 683 | return bdrv_pread_em(bs, offset, buf1, count1); |
83f64091 FB |
684 | return drv->bdrv_pread(bs, offset, buf1, count1); |
685 | } | |
686 | ||
5fafdf24 TS |
687 | /** |
688 | * Write with byte offsets (needed only for file protocols) | |
83f64091 | 689 | */ |
5fafdf24 | 690 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, |
83f64091 FB |
691 | const void *buf1, int count1) |
692 | { | |
693 | BlockDriver *drv = bs->drv; | |
694 | ||
695 | if (!drv) | |
19cb3738 | 696 | return -ENOMEDIUM; |
83f64091 | 697 | if (!drv->bdrv_pwrite) |
faea38e7 | 698 | return bdrv_pwrite_em(bs, offset, buf1, count1); |
83f64091 FB |
699 | return drv->bdrv_pwrite(bs, offset, buf1, count1); |
700 | } | |
701 | ||
702 | /** | |
703 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
704 | */ | |
705 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
706 | { | |
707 | BlockDriver *drv = bs->drv; | |
708 | if (!drv) | |
19cb3738 | 709 | return -ENOMEDIUM; |
83f64091 FB |
710 | if (!drv->bdrv_truncate) |
711 | return -ENOTSUP; | |
712 | return drv->bdrv_truncate(bs, offset); | |
713 | } | |
714 | ||
715 | /** | |
716 | * Length of a file in bytes. Return < 0 if error or unknown. | |
717 | */ | |
718 | int64_t bdrv_getlength(BlockDriverState *bs) | |
719 | { | |
720 | BlockDriver *drv = bs->drv; | |
721 | if (!drv) | |
19cb3738 | 722 | return -ENOMEDIUM; |
83f64091 FB |
723 | if (!drv->bdrv_getlength) { |
724 | /* legacy mode */ | |
725 | return bs->total_sectors * SECTOR_SIZE; | |
726 | } | |
727 | return drv->bdrv_getlength(bs); | |
fc01f7e7 FB |
728 | } |
729 | ||
19cb3738 | 730 | /* return 0 as number of sectors if no device present or error */ |
96b8f136 | 731 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
fc01f7e7 | 732 | { |
19cb3738 FB |
733 | int64_t length; |
734 | length = bdrv_getlength(bs); | |
735 | if (length < 0) | |
736 | length = 0; | |
737 | else | |
738 | length = length >> SECTOR_BITS; | |
739 | *nb_sectors_ptr = length; | |
fc01f7e7 | 740 | } |
cf98951b | 741 | |
f3d54fc4 AL |
742 | struct partition { |
743 | uint8_t boot_ind; /* 0x80 - active */ | |
744 | uint8_t head; /* starting head */ | |
745 | uint8_t sector; /* starting sector */ | |
746 | uint8_t cyl; /* starting cylinder */ | |
747 | uint8_t sys_ind; /* What partition type */ | |
748 | uint8_t end_head; /* end head */ | |
749 | uint8_t end_sector; /* end sector */ | |
750 | uint8_t end_cyl; /* end cylinder */ | |
751 | uint32_t start_sect; /* starting sector counting from 0 */ | |
752 | uint32_t nr_sects; /* nr of sectors in partition */ | |
753 | } __attribute__((packed)); | |
754 | ||
755 | /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */ | |
756 | static int guess_disk_lchs(BlockDriverState *bs, | |
757 | int *pcylinders, int *pheads, int *psectors) | |
758 | { | |
759 | uint8_t buf[512]; | |
760 | int ret, i, heads, sectors, cylinders; | |
761 | struct partition *p; | |
762 | uint32_t nr_sects; | |
763 | int64_t nb_sectors; | |
764 | ||
765 | bdrv_get_geometry(bs, &nb_sectors); | |
766 | ||
767 | ret = bdrv_read(bs, 0, buf, 1); | |
768 | if (ret < 0) | |
769 | return -1; | |
770 | /* test msdos magic */ | |
771 | if (buf[510] != 0x55 || buf[511] != 0xaa) | |
772 | return -1; | |
773 | for(i = 0; i < 4; i++) { | |
774 | p = ((struct partition *)(buf + 0x1be)) + i; | |
775 | nr_sects = le32_to_cpu(p->nr_sects); | |
776 | if (nr_sects && p->end_head) { | |
777 | /* We make the assumption that the partition terminates on | |
778 | a cylinder boundary */ | |
779 | heads = p->end_head + 1; | |
780 | sectors = p->end_sector & 63; | |
781 | if (sectors == 0) | |
782 | continue; | |
783 | cylinders = nb_sectors / (heads * sectors); | |
784 | if (cylinders < 1 || cylinders > 16383) | |
785 | continue; | |
786 | *pheads = heads; | |
787 | *psectors = sectors; | |
788 | *pcylinders = cylinders; | |
789 | #if 0 | |
790 | printf("guessed geometry: LCHS=%d %d %d\n", | |
791 | cylinders, heads, sectors); | |
792 | #endif | |
793 | return 0; | |
794 | } | |
795 | } | |
796 | return -1; | |
797 | } | |
798 | ||
799 | void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) | |
800 | { | |
801 | int translation, lba_detected = 0; | |
802 | int cylinders, heads, secs; | |
803 | int64_t nb_sectors; | |
804 | ||
805 | /* if a geometry hint is available, use it */ | |
806 | bdrv_get_geometry(bs, &nb_sectors); | |
807 | bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); | |
808 | translation = bdrv_get_translation_hint(bs); | |
809 | if (cylinders != 0) { | |
810 | *pcyls = cylinders; | |
811 | *pheads = heads; | |
812 | *psecs = secs; | |
813 | } else { | |
814 | if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { | |
815 | if (heads > 16) { | |
816 | /* if heads > 16, it means that a BIOS LBA | |
817 | translation was active, so the default | |
818 | hardware geometry is OK */ | |
819 | lba_detected = 1; | |
820 | goto default_geometry; | |
821 | } else { | |
822 | *pcyls = cylinders; | |
823 | *pheads = heads; | |
824 | *psecs = secs; | |
825 | /* disable any translation to be in sync with | |
826 | the logical geometry */ | |
827 | if (translation == BIOS_ATA_TRANSLATION_AUTO) { | |
828 | bdrv_set_translation_hint(bs, | |
829 | BIOS_ATA_TRANSLATION_NONE); | |
830 | } | |
831 | } | |
832 | } else { | |
833 | default_geometry: | |
834 | /* if no geometry, use a standard physical disk geometry */ | |
835 | cylinders = nb_sectors / (16 * 63); | |
836 | ||
837 | if (cylinders > 16383) | |
838 | cylinders = 16383; | |
839 | else if (cylinders < 2) | |
840 | cylinders = 2; | |
841 | *pcyls = cylinders; | |
842 | *pheads = 16; | |
843 | *psecs = 63; | |
844 | if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { | |
845 | if ((*pcyls * *pheads) <= 131072) { | |
846 | bdrv_set_translation_hint(bs, | |
847 | BIOS_ATA_TRANSLATION_LARGE); | |
848 | } else { | |
849 | bdrv_set_translation_hint(bs, | |
850 | BIOS_ATA_TRANSLATION_LBA); | |
851 | } | |
852 | } | |
853 | } | |
854 | bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); | |
855 | } | |
856 | } | |
857 | ||
5fafdf24 | 858 | void bdrv_set_geometry_hint(BlockDriverState *bs, |
b338082b FB |
859 | int cyls, int heads, int secs) |
860 | { | |
861 | bs->cyls = cyls; | |
862 | bs->heads = heads; | |
863 | bs->secs = secs; | |
864 | } | |
865 | ||
866 | void bdrv_set_type_hint(BlockDriverState *bs, int type) | |
867 | { | |
868 | bs->type = type; | |
869 | bs->removable = ((type == BDRV_TYPE_CDROM || | |
870 | type == BDRV_TYPE_FLOPPY)); | |
871 | } | |
872 | ||
46d4767d FB |
873 | void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
874 | { | |
875 | bs->translation = translation; | |
876 | } | |
877 | ||
5fafdf24 | 878 | void bdrv_get_geometry_hint(BlockDriverState *bs, |
b338082b FB |
879 | int *pcyls, int *pheads, int *psecs) |
880 | { | |
881 | *pcyls = bs->cyls; | |
882 | *pheads = bs->heads; | |
883 | *psecs = bs->secs; | |
884 | } | |
885 | ||
886 | int bdrv_get_type_hint(BlockDriverState *bs) | |
887 | { | |
888 | return bs->type; | |
889 | } | |
890 | ||
46d4767d FB |
891 | int bdrv_get_translation_hint(BlockDriverState *bs) |
892 | { | |
893 | return bs->translation; | |
894 | } | |
895 | ||
b338082b FB |
896 | int bdrv_is_removable(BlockDriverState *bs) |
897 | { | |
898 | return bs->removable; | |
899 | } | |
900 | ||
901 | int bdrv_is_read_only(BlockDriverState *bs) | |
902 | { | |
903 | return bs->read_only; | |
904 | } | |
905 | ||
985a03b0 TS |
906 | int bdrv_is_sg(BlockDriverState *bs) |
907 | { | |
908 | return bs->sg; | |
909 | } | |
910 | ||
19cb3738 | 911 | /* XXX: no longer used */ |
5fafdf24 | 912 | void bdrv_set_change_cb(BlockDriverState *bs, |
b338082b FB |
913 | void (*change_cb)(void *opaque), void *opaque) |
914 | { | |
915 | bs->change_cb = change_cb; | |
916 | bs->change_opaque = opaque; | |
917 | } | |
918 | ||
ea2384d3 FB |
919 | int bdrv_is_encrypted(BlockDriverState *bs) |
920 | { | |
921 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
922 | return 1; | |
923 | return bs->encrypted; | |
924 | } | |
925 | ||
926 | int bdrv_set_key(BlockDriverState *bs, const char *key) | |
927 | { | |
928 | int ret; | |
929 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
930 | ret = bdrv_set_key(bs->backing_hd, key); | |
931 | if (ret < 0) | |
932 | return ret; | |
933 | if (!bs->encrypted) | |
934 | return 0; | |
935 | } | |
936 | if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key) | |
937 | return -1; | |
938 | return bs->drv->bdrv_set_key(bs, key); | |
939 | } | |
940 | ||
941 | void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) | |
942 | { | |
19cb3738 | 943 | if (!bs->drv) { |
ea2384d3 FB |
944 | buf[0] = '\0'; |
945 | } else { | |
946 | pstrcpy(buf, buf_size, bs->drv->format_name); | |
947 | } | |
948 | } | |
949 | ||
5fafdf24 | 950 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
ea2384d3 FB |
951 | void *opaque) |
952 | { | |
953 | BlockDriver *drv; | |
954 | ||
955 | for (drv = first_drv; drv != NULL; drv = drv->next) { | |
956 | it(opaque, drv->format_name); | |
957 | } | |
958 | } | |
959 | ||
b338082b FB |
960 | BlockDriverState *bdrv_find(const char *name) |
961 | { | |
962 | BlockDriverState *bs; | |
963 | ||
964 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
965 | if (!strcmp(name, bs->device_name)) | |
966 | return bs; | |
967 | } | |
968 | return NULL; | |
969 | } | |
970 | ||
81d0912d FB |
971 | void bdrv_iterate(void (*it)(void *opaque, const char *name), void *opaque) |
972 | { | |
973 | BlockDriverState *bs; | |
974 | ||
975 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
976 | it(opaque, bs->device_name); | |
977 | } | |
978 | } | |
979 | ||
ea2384d3 FB |
980 | const char *bdrv_get_device_name(BlockDriverState *bs) |
981 | { | |
982 | return bs->device_name; | |
983 | } | |
984 | ||
7a6cba61 PB |
985 | void bdrv_flush(BlockDriverState *bs) |
986 | { | |
987 | if (bs->drv->bdrv_flush) | |
988 | bs->drv->bdrv_flush(bs); | |
989 | if (bs->backing_hd) | |
990 | bdrv_flush(bs->backing_hd); | |
991 | } | |
992 | ||
c6ca28d6 AL |
993 | void bdrv_flush_all(void) |
994 | { | |
995 | BlockDriverState *bs; | |
996 | ||
997 | for (bs = bdrv_first; bs != NULL; bs = bs->next) | |
998 | if (bs->drv && !bdrv_is_read_only(bs) && | |
999 | (!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) | |
1000 | bdrv_flush(bs); | |
1001 | } | |
1002 | ||
f58c7b35 TS |
1003 | /* |
1004 | * Returns true iff the specified sector is present in the disk image. Drivers | |
1005 | * not implementing the functionality are assumed to not support backing files, | |
1006 | * hence all their sectors are reported as allocated. | |
1007 | * | |
1008 | * 'pnum' is set to the number of sectors (including and immediately following | |
1009 | * the specified sector) that are known to be in the same | |
1010 | * allocated/unallocated state. | |
1011 | * | |
1012 | * 'nb_sectors' is the max value 'pnum' should be set to. | |
1013 | */ | |
1014 | int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, | |
1015 | int *pnum) | |
1016 | { | |
1017 | int64_t n; | |
1018 | if (!bs->drv->bdrv_is_allocated) { | |
1019 | if (sector_num >= bs->total_sectors) { | |
1020 | *pnum = 0; | |
1021 | return 0; | |
1022 | } | |
1023 | n = bs->total_sectors - sector_num; | |
1024 | *pnum = (n < nb_sectors) ? (n) : (nb_sectors); | |
1025 | return 1; | |
1026 | } | |
1027 | return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum); | |
1028 | } | |
1029 | ||
b338082b FB |
1030 | void bdrv_info(void) |
1031 | { | |
1032 | BlockDriverState *bs; | |
1033 | ||
1034 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
1035 | term_printf("%s:", bs->device_name); | |
1036 | term_printf(" type="); | |
1037 | switch(bs->type) { | |
1038 | case BDRV_TYPE_HD: | |
1039 | term_printf("hd"); | |
1040 | break; | |
1041 | case BDRV_TYPE_CDROM: | |
1042 | term_printf("cdrom"); | |
1043 | break; | |
1044 | case BDRV_TYPE_FLOPPY: | |
1045 | term_printf("floppy"); | |
1046 | break; | |
1047 | } | |
1048 | term_printf(" removable=%d", bs->removable); | |
1049 | if (bs->removable) { | |
1050 | term_printf(" locked=%d", bs->locked); | |
1051 | } | |
19cb3738 | 1052 | if (bs->drv) { |
fef30743 TS |
1053 | term_printf(" file="); |
1054 | term_print_filename(bs->filename); | |
1055 | if (bs->backing_file[0] != '\0') { | |
1056 | term_printf(" backing_file="); | |
1057 | term_print_filename(bs->backing_file); | |
1058 | } | |
b338082b | 1059 | term_printf(" ro=%d", bs->read_only); |
ea2384d3 FB |
1060 | term_printf(" drv=%s", bs->drv->format_name); |
1061 | if (bs->encrypted) | |
1062 | term_printf(" encrypted"); | |
b338082b FB |
1063 | } else { |
1064 | term_printf(" [not inserted]"); | |
1065 | } | |
1066 | term_printf("\n"); | |
1067 | } | |
1068 | } | |
a36e69dd TS |
1069 | |
1070 | /* The "info blockstats" command. */ | |
1071 | void bdrv_info_stats (void) | |
1072 | { | |
1073 | BlockDriverState *bs; | |
1074 | ||
1075 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
1076 | term_printf ("%s:" | |
1077 | " rd_bytes=%" PRIu64 | |
1078 | " wr_bytes=%" PRIu64 | |
1079 | " rd_operations=%" PRIu64 | |
1080 | " wr_operations=%" PRIu64 | |
1081 | "\n", | |
1082 | bs->device_name, | |
1083 | bs->rd_bytes, bs->wr_bytes, | |
1084 | bs->rd_ops, bs->wr_ops); | |
1085 | } | |
1086 | } | |
ea2384d3 | 1087 | |
5fafdf24 | 1088 | void bdrv_get_backing_filename(BlockDriverState *bs, |
83f64091 FB |
1089 | char *filename, int filename_size) |
1090 | { | |
1091 | if (!bs->backing_hd) { | |
1092 | pstrcpy(filename, filename_size, ""); | |
1093 | } else { | |
1094 | pstrcpy(filename, filename_size, bs->backing_file); | |
1095 | } | |
1096 | } | |
1097 | ||
5fafdf24 | 1098 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
faea38e7 FB |
1099 | const uint8_t *buf, int nb_sectors) |
1100 | { | |
1101 | BlockDriver *drv = bs->drv; | |
1102 | if (!drv) | |
19cb3738 | 1103 | return -ENOMEDIUM; |
faea38e7 FB |
1104 | if (!drv->bdrv_write_compressed) |
1105 | return -ENOTSUP; | |
1106 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); | |
1107 | } | |
3b46e624 | 1108 | |
faea38e7 FB |
1109 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
1110 | { | |
1111 | BlockDriver *drv = bs->drv; | |
1112 | if (!drv) | |
19cb3738 | 1113 | return -ENOMEDIUM; |
faea38e7 FB |
1114 | if (!drv->bdrv_get_info) |
1115 | return -ENOTSUP; | |
1116 | memset(bdi, 0, sizeof(*bdi)); | |
1117 | return drv->bdrv_get_info(bs, bdi); | |
1118 | } | |
1119 | ||
1120 | /**************************************************************/ | |
1121 | /* handling of snapshots */ | |
1122 | ||
5fafdf24 | 1123 | int bdrv_snapshot_create(BlockDriverState *bs, |
faea38e7 FB |
1124 | QEMUSnapshotInfo *sn_info) |
1125 | { | |
1126 | BlockDriver *drv = bs->drv; | |
1127 | if (!drv) | |
19cb3738 | 1128 | return -ENOMEDIUM; |
faea38e7 FB |
1129 | if (!drv->bdrv_snapshot_create) |
1130 | return -ENOTSUP; | |
1131 | return drv->bdrv_snapshot_create(bs, sn_info); | |
1132 | } | |
1133 | ||
5fafdf24 | 1134 | int bdrv_snapshot_goto(BlockDriverState *bs, |
faea38e7 FB |
1135 | const char *snapshot_id) |
1136 | { | |
1137 | BlockDriver *drv = bs->drv; | |
1138 | if (!drv) | |
19cb3738 | 1139 | return -ENOMEDIUM; |
faea38e7 FB |
1140 | if (!drv->bdrv_snapshot_goto) |
1141 | return -ENOTSUP; | |
1142 | return drv->bdrv_snapshot_goto(bs, snapshot_id); | |
1143 | } | |
1144 | ||
1145 | int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) | |
1146 | { | |
1147 | BlockDriver *drv = bs->drv; | |
1148 | if (!drv) | |
19cb3738 | 1149 | return -ENOMEDIUM; |
faea38e7 FB |
1150 | if (!drv->bdrv_snapshot_delete) |
1151 | return -ENOTSUP; | |
1152 | return drv->bdrv_snapshot_delete(bs, snapshot_id); | |
1153 | } | |
1154 | ||
5fafdf24 | 1155 | int bdrv_snapshot_list(BlockDriverState *bs, |
faea38e7 FB |
1156 | QEMUSnapshotInfo **psn_info) |
1157 | { | |
1158 | BlockDriver *drv = bs->drv; | |
1159 | if (!drv) | |
19cb3738 | 1160 | return -ENOMEDIUM; |
faea38e7 FB |
1161 | if (!drv->bdrv_snapshot_list) |
1162 | return -ENOTSUP; | |
1163 | return drv->bdrv_snapshot_list(bs, psn_info); | |
1164 | } | |
1165 | ||
1166 | #define NB_SUFFIXES 4 | |
1167 | ||
1168 | char *get_human_readable_size(char *buf, int buf_size, int64_t size) | |
1169 | { | |
1170 | static const char suffixes[NB_SUFFIXES] = "KMGT"; | |
1171 | int64_t base; | |
1172 | int i; | |
1173 | ||
1174 | if (size <= 999) { | |
1175 | snprintf(buf, buf_size, "%" PRId64, size); | |
1176 | } else { | |
1177 | base = 1024; | |
1178 | for(i = 0; i < NB_SUFFIXES; i++) { | |
1179 | if (size < (10 * base)) { | |
5fafdf24 | 1180 | snprintf(buf, buf_size, "%0.1f%c", |
faea38e7 FB |
1181 | (double)size / base, |
1182 | suffixes[i]); | |
1183 | break; | |
1184 | } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { | |
5fafdf24 | 1185 | snprintf(buf, buf_size, "%" PRId64 "%c", |
faea38e7 FB |
1186 | ((size + (base >> 1)) / base), |
1187 | suffixes[i]); | |
1188 | break; | |
1189 | } | |
1190 | base = base * 1024; | |
1191 | } | |
1192 | } | |
1193 | return buf; | |
1194 | } | |
1195 | ||
1196 | char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) | |
1197 | { | |
1198 | char buf1[128], date_buf[128], clock_buf[128]; | |
3b9f94e1 FB |
1199 | #ifdef _WIN32 |
1200 | struct tm *ptm; | |
1201 | #else | |
faea38e7 | 1202 | struct tm tm; |
3b9f94e1 | 1203 | #endif |
faea38e7 FB |
1204 | time_t ti; |
1205 | int64_t secs; | |
1206 | ||
1207 | if (!sn) { | |
5fafdf24 TS |
1208 | snprintf(buf, buf_size, |
1209 | "%-10s%-20s%7s%20s%15s", | |
faea38e7 FB |
1210 | "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
1211 | } else { | |
1212 | ti = sn->date_sec; | |
3b9f94e1 FB |
1213 | #ifdef _WIN32 |
1214 | ptm = localtime(&ti); | |
1215 | strftime(date_buf, sizeof(date_buf), | |
1216 | "%Y-%m-%d %H:%M:%S", ptm); | |
1217 | #else | |
faea38e7 FB |
1218 | localtime_r(&ti, &tm); |
1219 | strftime(date_buf, sizeof(date_buf), | |
1220 | "%Y-%m-%d %H:%M:%S", &tm); | |
3b9f94e1 | 1221 | #endif |
faea38e7 FB |
1222 | secs = sn->vm_clock_nsec / 1000000000; |
1223 | snprintf(clock_buf, sizeof(clock_buf), | |
1224 | "%02d:%02d:%02d.%03d", | |
1225 | (int)(secs / 3600), | |
1226 | (int)((secs / 60) % 60), | |
5fafdf24 | 1227 | (int)(secs % 60), |
faea38e7 FB |
1228 | (int)((sn->vm_clock_nsec / 1000000) % 1000)); |
1229 | snprintf(buf, buf_size, | |
5fafdf24 | 1230 | "%-10s%-20s%7s%20s%15s", |
faea38e7 FB |
1231 | sn->id_str, sn->name, |
1232 | get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), | |
1233 | date_buf, | |
1234 | clock_buf); | |
1235 | } | |
1236 | return buf; | |
1237 | } | |
1238 | ||
83f64091 | 1239 | |
ea2384d3 | 1240 | /**************************************************************/ |
83f64091 | 1241 | /* async I/Os */ |
ea2384d3 | 1242 | |
ce1a14dc PB |
1243 | BlockDriverAIOCB *bdrv_aio_read(BlockDriverState *bs, int64_t sector_num, |
1244 | uint8_t *buf, int nb_sectors, | |
1245 | BlockDriverCompletionFunc *cb, void *opaque) | |
83f64091 FB |
1246 | { |
1247 | BlockDriver *drv = bs->drv; | |
a36e69dd | 1248 | BlockDriverAIOCB *ret; |
83f64091 | 1249 | |
19cb3738 | 1250 | if (!drv) |
ce1a14dc | 1251 | return NULL; |
3b46e624 | 1252 | |
a36e69dd TS |
1253 | ret = drv->bdrv_aio_read(bs, sector_num, buf, nb_sectors, cb, opaque); |
1254 | ||
1255 | if (ret) { | |
1256 | /* Update stats even though technically transfer has not happened. */ | |
1257 | bs->rd_bytes += (unsigned) nb_sectors * SECTOR_SIZE; | |
1258 | bs->rd_ops ++; | |
1259 | } | |
1260 | ||
1261 | return ret; | |
ea2384d3 FB |
1262 | } |
1263 | ||
ce1a14dc PB |
1264 | BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num, |
1265 | const uint8_t *buf, int nb_sectors, | |
1266 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 1267 | { |
83f64091 | 1268 | BlockDriver *drv = bs->drv; |
a36e69dd | 1269 | BlockDriverAIOCB *ret; |
ea2384d3 | 1270 | |
19cb3738 | 1271 | if (!drv) |
ce1a14dc | 1272 | return NULL; |
83f64091 | 1273 | if (bs->read_only) |
ce1a14dc | 1274 | return NULL; |
83f64091 | 1275 | |
a36e69dd TS |
1276 | ret = drv->bdrv_aio_write(bs, sector_num, buf, nb_sectors, cb, opaque); |
1277 | ||
1278 | if (ret) { | |
1279 | /* Update stats even though technically transfer has not happened. */ | |
1280 | bs->wr_bytes += (unsigned) nb_sectors * SECTOR_SIZE; | |
1281 | bs->wr_ops ++; | |
1282 | } | |
1283 | ||
1284 | return ret; | |
83f64091 FB |
1285 | } |
1286 | ||
1287 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) | |
83f64091 | 1288 | { |
ce1a14dc | 1289 | BlockDriver *drv = acb->bs->drv; |
83f64091 | 1290 | |
ce1a14dc | 1291 | drv->bdrv_aio_cancel(acb); |
83f64091 FB |
1292 | } |
1293 | ||
ce1a14dc | 1294 | |
83f64091 FB |
1295 | /**************************************************************/ |
1296 | /* async block device emulation */ | |
1297 | ||
ce1a14dc | 1298 | static void bdrv_aio_bh_cb(void *opaque) |
83f64091 | 1299 | { |
ce1a14dc PB |
1300 | BlockDriverAIOCBSync *acb = opaque; |
1301 | acb->common.cb(acb->common.opaque, acb->ret); | |
1302 | qemu_aio_release(acb); | |
83f64091 | 1303 | } |
beac80cd | 1304 | |
ce1a14dc PB |
1305 | static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs, |
1306 | int64_t sector_num, uint8_t *buf, int nb_sectors, | |
1307 | BlockDriverCompletionFunc *cb, void *opaque) | |
83f64091 | 1308 | { |
ce1a14dc | 1309 | BlockDriverAIOCBSync *acb; |
83f64091 | 1310 | int ret; |
ce1a14dc PB |
1311 | |
1312 | acb = qemu_aio_get(bs, cb, opaque); | |
1313 | if (!acb->bh) | |
1314 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
1315 | ret = bdrv_read(bs, sector_num, buf, nb_sectors); | |
1316 | acb->ret = ret; | |
1317 | qemu_bh_schedule(acb->bh); | |
1318 | return &acb->common; | |
beac80cd FB |
1319 | } |
1320 | ||
ce1a14dc PB |
1321 | static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs, |
1322 | int64_t sector_num, const uint8_t *buf, int nb_sectors, | |
1323 | BlockDriverCompletionFunc *cb, void *opaque) | |
beac80cd | 1324 | { |
ce1a14dc | 1325 | BlockDriverAIOCBSync *acb; |
83f64091 | 1326 | int ret; |
83f64091 | 1327 | |
ce1a14dc PB |
1328 | acb = qemu_aio_get(bs, cb, opaque); |
1329 | if (!acb->bh) | |
1330 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
1331 | ret = bdrv_write(bs, sector_num, buf, nb_sectors); | |
1332 | acb->ret = ret; | |
1333 | qemu_bh_schedule(acb->bh); | |
1334 | return &acb->common; | |
beac80cd | 1335 | } |
beac80cd | 1336 | |
ce1a14dc | 1337 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) |
ea2384d3 | 1338 | { |
ce1a14dc PB |
1339 | BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb; |
1340 | qemu_bh_cancel(acb->bh); | |
1341 | qemu_aio_release(acb); | |
83f64091 | 1342 | } |
ea2384d3 | 1343 | |
83f64091 FB |
1344 | /**************************************************************/ |
1345 | /* sync block device emulation */ | |
ea2384d3 | 1346 | |
83f64091 FB |
1347 | static void bdrv_rw_em_cb(void *opaque, int ret) |
1348 | { | |
1349 | *(int *)opaque = ret; | |
ea2384d3 FB |
1350 | } |
1351 | ||
83f64091 FB |
1352 | #define NOT_DONE 0x7fffffff |
1353 | ||
5fafdf24 | 1354 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
83f64091 | 1355 | uint8_t *buf, int nb_sectors) |
7a6cba61 | 1356 | { |
ce1a14dc PB |
1357 | int async_ret; |
1358 | BlockDriverAIOCB *acb; | |
83f64091 | 1359 | |
83f64091 | 1360 | async_ret = NOT_DONE; |
5fafdf24 | 1361 | acb = bdrv_aio_read(bs, sector_num, buf, nb_sectors, |
83f64091 | 1362 | bdrv_rw_em_cb, &async_ret); |
baf35cb9 | 1363 | if (acb == NULL) |
ce1a14dc | 1364 | return -1; |
baf35cb9 | 1365 | |
83f64091 FB |
1366 | while (async_ret == NOT_DONE) { |
1367 | qemu_aio_wait(); | |
1368 | } | |
baf35cb9 | 1369 | |
83f64091 | 1370 | return async_ret; |
7a6cba61 PB |
1371 | } |
1372 | ||
83f64091 FB |
1373 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
1374 | const uint8_t *buf, int nb_sectors) | |
1375 | { | |
ce1a14dc PB |
1376 | int async_ret; |
1377 | BlockDriverAIOCB *acb; | |
83f64091 | 1378 | |
83f64091 | 1379 | async_ret = NOT_DONE; |
5fafdf24 | 1380 | acb = bdrv_aio_write(bs, sector_num, buf, nb_sectors, |
83f64091 | 1381 | bdrv_rw_em_cb, &async_ret); |
baf35cb9 | 1382 | if (acb == NULL) |
ce1a14dc | 1383 | return -1; |
83f64091 FB |
1384 | while (async_ret == NOT_DONE) { |
1385 | qemu_aio_wait(); | |
1386 | } | |
83f64091 FB |
1387 | return async_ret; |
1388 | } | |
ea2384d3 FB |
1389 | |
1390 | void bdrv_init(void) | |
1391 | { | |
1392 | bdrv_register(&bdrv_raw); | |
19cb3738 | 1393 | bdrv_register(&bdrv_host_device); |
ea2384d3 FB |
1394 | #ifndef _WIN32 |
1395 | bdrv_register(&bdrv_cow); | |
1396 | #endif | |
1397 | bdrv_register(&bdrv_qcow); | |
1398 | bdrv_register(&bdrv_vmdk); | |
3c56521b | 1399 | bdrv_register(&bdrv_cloop); |
585d0ed9 | 1400 | bdrv_register(&bdrv_dmg); |
a8753c34 | 1401 | bdrv_register(&bdrv_bochs); |
6a0f9e82 | 1402 | bdrv_register(&bdrv_vpc); |
712e7874 | 1403 | bdrv_register(&bdrv_vvfat); |
faea38e7 | 1404 | bdrv_register(&bdrv_qcow2); |
6ada7453 | 1405 | bdrv_register(&bdrv_parallels); |
75818250 | 1406 | bdrv_register(&bdrv_nbd); |
ea2384d3 | 1407 | } |
ce1a14dc PB |
1408 | |
1409 | void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb, | |
1410 | void *opaque) | |
1411 | { | |
1412 | BlockDriver *drv; | |
1413 | BlockDriverAIOCB *acb; | |
1414 | ||
1415 | drv = bs->drv; | |
1416 | if (drv->free_aiocb) { | |
1417 | acb = drv->free_aiocb; | |
1418 | drv->free_aiocb = acb->next; | |
1419 | } else { | |
1420 | acb = qemu_mallocz(drv->aiocb_size); | |
1421 | if (!acb) | |
1422 | return NULL; | |
1423 | } | |
1424 | acb->bs = bs; | |
1425 | acb->cb = cb; | |
1426 | acb->opaque = opaque; | |
1427 | return acb; | |
1428 | } | |
1429 | ||
1430 | void qemu_aio_release(void *p) | |
1431 | { | |
1432 | BlockDriverAIOCB *acb = p; | |
1433 | BlockDriver *drv = acb->bs->drv; | |
1434 | acb->next = drv->free_aiocb; | |
1435 | drv->free_aiocb = acb; | |
1436 | } | |
19cb3738 FB |
1437 | |
1438 | /**************************************************************/ | |
1439 | /* removable device support */ | |
1440 | ||
1441 | /** | |
1442 | * Return TRUE if the media is present | |
1443 | */ | |
1444 | int bdrv_is_inserted(BlockDriverState *bs) | |
1445 | { | |
1446 | BlockDriver *drv = bs->drv; | |
1447 | int ret; | |
1448 | if (!drv) | |
1449 | return 0; | |
1450 | if (!drv->bdrv_is_inserted) | |
1451 | return 1; | |
1452 | ret = drv->bdrv_is_inserted(bs); | |
1453 | return ret; | |
1454 | } | |
1455 | ||
1456 | /** | |
1457 | * Return TRUE if the media changed since the last call to this | |
5fafdf24 | 1458 | * function. It is currently only used for floppy disks |
19cb3738 FB |
1459 | */ |
1460 | int bdrv_media_changed(BlockDriverState *bs) | |
1461 | { | |
1462 | BlockDriver *drv = bs->drv; | |
1463 | int ret; | |
1464 | ||
1465 | if (!drv || !drv->bdrv_media_changed) | |
1466 | ret = -ENOTSUP; | |
1467 | else | |
1468 | ret = drv->bdrv_media_changed(bs); | |
1469 | if (ret == -ENOTSUP) | |
1470 | ret = bs->media_changed; | |
1471 | bs->media_changed = 0; | |
1472 | return ret; | |
1473 | } | |
1474 | ||
1475 | /** | |
1476 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
1477 | */ | |
1478 | void bdrv_eject(BlockDriverState *bs, int eject_flag) | |
1479 | { | |
1480 | BlockDriver *drv = bs->drv; | |
1481 | int ret; | |
1482 | ||
1483 | if (!drv || !drv->bdrv_eject) { | |
1484 | ret = -ENOTSUP; | |
1485 | } else { | |
1486 | ret = drv->bdrv_eject(bs, eject_flag); | |
1487 | } | |
1488 | if (ret == -ENOTSUP) { | |
1489 | if (eject_flag) | |
1490 | bdrv_close(bs); | |
1491 | } | |
1492 | } | |
1493 | ||
1494 | int bdrv_is_locked(BlockDriverState *bs) | |
1495 | { | |
1496 | return bs->locked; | |
1497 | } | |
1498 | ||
1499 | /** | |
1500 | * Lock or unlock the media (if it is locked, the user won't be able | |
1501 | * to eject it manually). | |
1502 | */ | |
1503 | void bdrv_set_locked(BlockDriverState *bs, int locked) | |
1504 | { | |
1505 | BlockDriver *drv = bs->drv; | |
1506 | ||
1507 | bs->locked = locked; | |
1508 | if (drv && drv->bdrv_set_locked) { | |
1509 | drv->bdrv_set_locked(bs, locked); | |
1510 | } | |
1511 | } | |
985a03b0 TS |
1512 | |
1513 | /* needed for generic scsi interface */ | |
1514 | ||
1515 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
1516 | { | |
1517 | BlockDriver *drv = bs->drv; | |
1518 | ||
1519 | if (drv && drv->bdrv_ioctl) | |
1520 | return drv->bdrv_ioctl(bs, req, buf); | |
1521 | return -ENOTSUP; | |
1522 | } |