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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 | */ | |
3990d09a | 24 | #include "config-host.h" |
faf07963 | 25 | #include "qemu-common.h" |
376253ec | 26 | #include "monitor.h" |
ea2384d3 | 27 | #include "block_int.h" |
5efa9d5a | 28 | #include "module.h" |
d15e5465 | 29 | #include "qemu-objects.h" |
fc01f7e7 | 30 | |
71e72a19 | 31 | #ifdef CONFIG_BSD |
7674e7bf FB |
32 | #include <sys/types.h> |
33 | #include <sys/stat.h> | |
34 | #include <sys/ioctl.h> | |
72cf2d4f | 35 | #include <sys/queue.h> |
c5e97233 | 36 | #ifndef __DragonFly__ |
7674e7bf FB |
37 | #include <sys/disk.h> |
38 | #endif | |
c5e97233 | 39 | #endif |
7674e7bf | 40 | |
49dc768d AL |
41 | #ifdef _WIN32 |
42 | #include <windows.h> | |
43 | #endif | |
44 | ||
f141eafe AL |
45 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
46 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
c87c0672 | 47 | BlockDriverCompletionFunc *cb, void *opaque); |
f141eafe AL |
48 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
49 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 50 | BlockDriverCompletionFunc *cb, void *opaque); |
b2e12bc6 CH |
51 | static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, |
52 | BlockDriverCompletionFunc *cb, void *opaque); | |
5fafdf24 | 53 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
83f64091 FB |
54 | uint8_t *buf, int nb_sectors); |
55 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, | |
56 | const uint8_t *buf, int nb_sectors); | |
ec530c81 | 57 | |
7ee930d0 BS |
58 | BlockDriverState *bdrv_first; |
59 | ||
ea2384d3 FB |
60 | static BlockDriver *first_drv; |
61 | ||
eb852011 MA |
62 | /* If non-zero, use only whitelisted block drivers */ |
63 | static int use_bdrv_whitelist; | |
64 | ||
83f64091 | 65 | int path_is_absolute(const char *path) |
3b0d4f61 | 66 | { |
83f64091 | 67 | const char *p; |
21664424 FB |
68 | #ifdef _WIN32 |
69 | /* specific case for names like: "\\.\d:" */ | |
70 | if (*path == '/' || *path == '\\') | |
71 | return 1; | |
72 | #endif | |
83f64091 FB |
73 | p = strchr(path, ':'); |
74 | if (p) | |
75 | p++; | |
76 | else | |
77 | p = path; | |
3b9f94e1 FB |
78 | #ifdef _WIN32 |
79 | return (*p == '/' || *p == '\\'); | |
80 | #else | |
81 | return (*p == '/'); | |
82 | #endif | |
3b0d4f61 FB |
83 | } |
84 | ||
83f64091 FB |
85 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
86 | path to it by considering it is relative to base_path. URL are | |
87 | supported. */ | |
88 | void path_combine(char *dest, int dest_size, | |
89 | const char *base_path, | |
90 | const char *filename) | |
3b0d4f61 | 91 | { |
83f64091 FB |
92 | const char *p, *p1; |
93 | int len; | |
94 | ||
95 | if (dest_size <= 0) | |
96 | return; | |
97 | if (path_is_absolute(filename)) { | |
98 | pstrcpy(dest, dest_size, filename); | |
99 | } else { | |
100 | p = strchr(base_path, ':'); | |
101 | if (p) | |
102 | p++; | |
103 | else | |
104 | p = base_path; | |
3b9f94e1 FB |
105 | p1 = strrchr(base_path, '/'); |
106 | #ifdef _WIN32 | |
107 | { | |
108 | const char *p2; | |
109 | p2 = strrchr(base_path, '\\'); | |
110 | if (!p1 || p2 > p1) | |
111 | p1 = p2; | |
112 | } | |
113 | #endif | |
83f64091 FB |
114 | if (p1) |
115 | p1++; | |
116 | else | |
117 | p1 = base_path; | |
118 | if (p1 > p) | |
119 | p = p1; | |
120 | len = p - base_path; | |
121 | if (len > dest_size - 1) | |
122 | len = dest_size - 1; | |
123 | memcpy(dest, base_path, len); | |
124 | dest[len] = '\0'; | |
125 | pstrcat(dest, dest_size, filename); | |
3b0d4f61 | 126 | } |
3b0d4f61 FB |
127 | } |
128 | ||
5efa9d5a | 129 | void bdrv_register(BlockDriver *bdrv) |
ea2384d3 | 130 | { |
f141eafe | 131 | if (!bdrv->bdrv_aio_readv) { |
83f64091 | 132 | /* add AIO emulation layer */ |
f141eafe AL |
133 | bdrv->bdrv_aio_readv = bdrv_aio_readv_em; |
134 | bdrv->bdrv_aio_writev = bdrv_aio_writev_em; | |
eda578e5 | 135 | } else if (!bdrv->bdrv_read) { |
83f64091 FB |
136 | /* add synchronous IO emulation layer */ |
137 | bdrv->bdrv_read = bdrv_read_em; | |
138 | bdrv->bdrv_write = bdrv_write_em; | |
139 | } | |
b2e12bc6 CH |
140 | |
141 | if (!bdrv->bdrv_aio_flush) | |
142 | bdrv->bdrv_aio_flush = bdrv_aio_flush_em; | |
143 | ||
ea2384d3 FB |
144 | bdrv->next = first_drv; |
145 | first_drv = bdrv; | |
146 | } | |
b338082b FB |
147 | |
148 | /* create a new block device (by default it is empty) */ | |
149 | BlockDriverState *bdrv_new(const char *device_name) | |
150 | { | |
151 | BlockDriverState **pbs, *bs; | |
152 | ||
153 | bs = qemu_mallocz(sizeof(BlockDriverState)); | |
b338082b | 154 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); |
ea2384d3 FB |
155 | if (device_name[0] != '\0') { |
156 | /* insert at the end */ | |
157 | pbs = &bdrv_first; | |
158 | while (*pbs != NULL) | |
159 | pbs = &(*pbs)->next; | |
160 | *pbs = bs; | |
161 | } | |
b338082b FB |
162 | return bs; |
163 | } | |
164 | ||
ea2384d3 FB |
165 | BlockDriver *bdrv_find_format(const char *format_name) |
166 | { | |
167 | BlockDriver *drv1; | |
168 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { | |
169 | if (!strcmp(drv1->format_name, format_name)) | |
170 | return drv1; | |
171 | } | |
172 | return NULL; | |
173 | } | |
174 | ||
eb852011 MA |
175 | static int bdrv_is_whitelisted(BlockDriver *drv) |
176 | { | |
177 | static const char *whitelist[] = { | |
178 | CONFIG_BDRV_WHITELIST | |
179 | }; | |
180 | const char **p; | |
181 | ||
182 | if (!whitelist[0]) | |
183 | return 1; /* no whitelist, anything goes */ | |
184 | ||
185 | for (p = whitelist; *p; p++) { | |
186 | if (!strcmp(drv->format_name, *p)) { | |
187 | return 1; | |
188 | } | |
189 | } | |
190 | return 0; | |
191 | } | |
192 | ||
193 | BlockDriver *bdrv_find_whitelisted_format(const char *format_name) | |
194 | { | |
195 | BlockDriver *drv = bdrv_find_format(format_name); | |
196 | return drv && bdrv_is_whitelisted(drv) ? drv : NULL; | |
197 | } | |
198 | ||
0e7e1989 KW |
199 | int bdrv_create(BlockDriver *drv, const char* filename, |
200 | QEMUOptionParameter *options) | |
ea2384d3 FB |
201 | { |
202 | if (!drv->bdrv_create) | |
203 | return -ENOTSUP; | |
0e7e1989 KW |
204 | |
205 | return drv->bdrv_create(filename, options); | |
ea2384d3 FB |
206 | } |
207 | ||
d5249393 | 208 | #ifdef _WIN32 |
95389c86 | 209 | void get_tmp_filename(char *filename, int size) |
d5249393 | 210 | { |
3b9f94e1 | 211 | char temp_dir[MAX_PATH]; |
3b46e624 | 212 | |
3b9f94e1 FB |
213 | GetTempPath(MAX_PATH, temp_dir); |
214 | GetTempFileName(temp_dir, "qem", 0, filename); | |
d5249393 FB |
215 | } |
216 | #else | |
95389c86 | 217 | void get_tmp_filename(char *filename, int size) |
fc01f7e7 | 218 | { |
67b915a5 | 219 | int fd; |
7ccfb2eb | 220 | const char *tmpdir; |
d5249393 | 221 | /* XXX: race condition possible */ |
0badc1ee AJ |
222 | tmpdir = getenv("TMPDIR"); |
223 | if (!tmpdir) | |
224 | tmpdir = "/tmp"; | |
225 | snprintf(filename, size, "%s/vl.XXXXXX", tmpdir); | |
ea2384d3 FB |
226 | fd = mkstemp(filename); |
227 | close(fd); | |
228 | } | |
d5249393 | 229 | #endif |
fc01f7e7 | 230 | |
19cb3738 | 231 | #ifdef _WIN32 |
f45512fe FB |
232 | static int is_windows_drive_prefix(const char *filename) |
233 | { | |
234 | return (((filename[0] >= 'a' && filename[0] <= 'z') || | |
235 | (filename[0] >= 'A' && filename[0] <= 'Z')) && | |
236 | filename[1] == ':'); | |
237 | } | |
3b46e624 | 238 | |
508c7cb3 | 239 | int is_windows_drive(const char *filename) |
19cb3738 | 240 | { |
5fafdf24 | 241 | if (is_windows_drive_prefix(filename) && |
f45512fe | 242 | filename[2] == '\0') |
19cb3738 FB |
243 | return 1; |
244 | if (strstart(filename, "\\\\.\\", NULL) || | |
245 | strstart(filename, "//./", NULL)) | |
246 | return 1; | |
247 | return 0; | |
248 | } | |
249 | #endif | |
250 | ||
83f64091 FB |
251 | static BlockDriver *find_protocol(const char *filename) |
252 | { | |
253 | BlockDriver *drv1; | |
254 | char protocol[128]; | |
1cec71e3 | 255 | int len; |
83f64091 | 256 | const char *p; |
19cb3738 FB |
257 | |
258 | #ifdef _WIN32 | |
f45512fe FB |
259 | if (is_windows_drive(filename) || |
260 | is_windows_drive_prefix(filename)) | |
5efa9d5a | 261 | return bdrv_find_format("raw"); |
19cb3738 | 262 | #endif |
1cec71e3 AL |
263 | p = strchr(filename, ':'); |
264 | if (!p) | |
5efa9d5a | 265 | return bdrv_find_format("raw"); |
1cec71e3 AL |
266 | len = p - filename; |
267 | if (len > sizeof(protocol) - 1) | |
268 | len = sizeof(protocol) - 1; | |
269 | memcpy(protocol, filename, len); | |
270 | protocol[len] = '\0'; | |
83f64091 | 271 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
5fafdf24 | 272 | if (drv1->protocol_name && |
83f64091 FB |
273 | !strcmp(drv1->protocol_name, protocol)) |
274 | return drv1; | |
275 | } | |
276 | return NULL; | |
277 | } | |
278 | ||
f3a5d3f8 CH |
279 | /* |
280 | * Detect host devices. By convention, /dev/cdrom[N] is always | |
281 | * recognized as a host CDROM. | |
282 | */ | |
f3a5d3f8 CH |
283 | static BlockDriver *find_hdev_driver(const char *filename) |
284 | { | |
508c7cb3 CH |
285 | int score_max = 0, score; |
286 | BlockDriver *drv = NULL, *d; | |
f3a5d3f8 | 287 | |
508c7cb3 CH |
288 | for (d = first_drv; d; d = d->next) { |
289 | if (d->bdrv_probe_device) { | |
290 | score = d->bdrv_probe_device(filename); | |
291 | if (score > score_max) { | |
292 | score_max = score; | |
293 | drv = d; | |
294 | } | |
295 | } | |
19cb3738 | 296 | } |
f3a5d3f8 | 297 | |
508c7cb3 | 298 | return drv; |
f3a5d3f8 | 299 | } |
3b46e624 | 300 | |
f3a5d3f8 CH |
301 | static BlockDriver *find_image_format(const char *filename) |
302 | { | |
303 | int ret, score, score_max; | |
304 | BlockDriver *drv1, *drv; | |
305 | uint8_t buf[2048]; | |
306 | BlockDriverState *bs; | |
307 | ||
83f64091 | 308 | drv = find_protocol(filename); |
19cb3738 | 309 | /* no need to test disk image formats for vvfat */ |
c833ab73 | 310 | if (drv && strcmp(drv->format_name, "vvfat") == 0) |
83f64091 | 311 | return drv; |
19cb3738 | 312 | |
f5edb014 | 313 | ret = bdrv_file_open(&bs, filename, 0); |
83f64091 FB |
314 | if (ret < 0) |
315 | return NULL; | |
316 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); | |
317 | bdrv_delete(bs); | |
318 | if (ret < 0) { | |
319 | return NULL; | |
320 | } | |
321 | ||
ea2384d3 FB |
322 | score_max = 0; |
323 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { | |
83f64091 FB |
324 | if (drv1->bdrv_probe) { |
325 | score = drv1->bdrv_probe(buf, ret, filename); | |
326 | if (score > score_max) { | |
327 | score_max = score; | |
328 | drv = drv1; | |
329 | } | |
0849bf08 | 330 | } |
fc01f7e7 | 331 | } |
ea2384d3 FB |
332 | return drv; |
333 | } | |
334 | ||
83f64091 | 335 | int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
ea2384d3 | 336 | { |
83f64091 FB |
337 | BlockDriverState *bs; |
338 | int ret; | |
339 | ||
340 | bs = bdrv_new(""); | |
83f64091 FB |
341 | ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL); |
342 | if (ret < 0) { | |
343 | bdrv_delete(bs); | |
344 | return ret; | |
3b0d4f61 | 345 | } |
71d0770c | 346 | bs->growable = 1; |
83f64091 FB |
347 | *pbs = bs; |
348 | return 0; | |
349 | } | |
350 | ||
351 | int bdrv_open(BlockDriverState *bs, const char *filename, int flags) | |
352 | { | |
353 | return bdrv_open2(bs, filename, flags, NULL); | |
ea2384d3 FB |
354 | } |
355 | ||
83f64091 | 356 | int bdrv_open2(BlockDriverState *bs, const char *filename, int flags, |
ea2384d3 FB |
357 | BlockDriver *drv) |
358 | { | |
f5edb014 | 359 | int ret, open_flags; |
eb5c851f TS |
360 | char tmp_filename[PATH_MAX]; |
361 | char backing_filename[PATH_MAX]; | |
3b46e624 | 362 | |
ea2384d3 FB |
363 | bs->is_temporary = 0; |
364 | bs->encrypted = 0; | |
c0f4ce77 | 365 | bs->valid_key = 0; |
4dca4b63 | 366 | bs->open_flags = flags; |
e268ca52 AL |
367 | /* buffer_alignment defaulted to 512, drivers can change this value */ |
368 | bs->buffer_alignment = 512; | |
712e7874 | 369 | |
83f64091 | 370 | if (flags & BDRV_O_SNAPSHOT) { |
ea2384d3 FB |
371 | BlockDriverState *bs1; |
372 | int64_t total_size; | |
7c96d46e | 373 | int is_protocol = 0; |
91a073a9 KW |
374 | BlockDriver *bdrv_qcow2; |
375 | QEMUOptionParameter *options; | |
3b46e624 | 376 | |
ea2384d3 FB |
377 | /* if snapshot, we create a temporary backing file and open it |
378 | instead of opening 'filename' directly */ | |
33e3963e | 379 | |
ea2384d3 FB |
380 | /* if there is a backing file, use it */ |
381 | bs1 = bdrv_new(""); | |
5eb45639 | 382 | ret = bdrv_open2(bs1, filename, 0, drv); |
51d7c00c | 383 | if (ret < 0) { |
ea2384d3 | 384 | bdrv_delete(bs1); |
51d7c00c | 385 | return ret; |
ea2384d3 | 386 | } |
6ea44308 | 387 | total_size = bdrv_getlength(bs1) >> BDRV_SECTOR_BITS; |
7c96d46e AL |
388 | |
389 | if (bs1->drv && bs1->drv->protocol_name) | |
390 | is_protocol = 1; | |
391 | ||
ea2384d3 | 392 | bdrv_delete(bs1); |
3b46e624 | 393 | |
ea2384d3 | 394 | get_tmp_filename(tmp_filename, sizeof(tmp_filename)); |
7c96d46e AL |
395 | |
396 | /* Real path is meaningless for protocols */ | |
397 | if (is_protocol) | |
398 | snprintf(backing_filename, sizeof(backing_filename), | |
399 | "%s", filename); | |
114cdfa9 KS |
400 | else if (!realpath(filename, backing_filename)) |
401 | return -errno; | |
7c96d46e | 402 | |
91a073a9 KW |
403 | bdrv_qcow2 = bdrv_find_format("qcow2"); |
404 | options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); | |
405 | ||
406 | set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size * 512); | |
407 | set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); | |
408 | if (drv) { | |
409 | set_option_parameter(options, BLOCK_OPT_BACKING_FMT, | |
410 | drv->format_name); | |
411 | } | |
412 | ||
413 | ret = bdrv_create(bdrv_qcow2, tmp_filename, options); | |
51d7c00c AL |
414 | if (ret < 0) { |
415 | return ret; | |
ea2384d3 | 416 | } |
91a073a9 | 417 | |
ea2384d3 | 418 | filename = tmp_filename; |
91a073a9 | 419 | drv = bdrv_qcow2; |
ea2384d3 FB |
420 | bs->is_temporary = 1; |
421 | } | |
712e7874 | 422 | |
ea2384d3 | 423 | pstrcpy(bs->filename, sizeof(bs->filename), filename); |
83f64091 FB |
424 | if (flags & BDRV_O_FILE) { |
425 | drv = find_protocol(filename); | |
51d7c00c | 426 | } else if (!drv) { |
f3a5d3f8 CH |
427 | drv = find_hdev_driver(filename); |
428 | if (!drv) { | |
429 | drv = find_image_format(filename); | |
430 | } | |
51d7c00c | 431 | } |
6987307c | 432 | |
51d7c00c AL |
433 | if (!drv) { |
434 | ret = -ENOENT; | |
435 | goto unlink_and_fail; | |
ea2384d3 | 436 | } |
6987307c CH |
437 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) { |
438 | ret = -ENOTSUP; | |
439 | goto unlink_and_fail; | |
440 | } | |
441 | ||
ea2384d3 FB |
442 | bs->drv = drv; |
443 | bs->opaque = qemu_mallocz(drv->instance_size); | |
e900a7b7 CH |
444 | |
445 | /* | |
446 | * Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a | |
447 | * write cache to the guest. We do need the fdatasync to flush | |
448 | * out transactions for block allocations, and we maybe have a | |
449 | * volatile write cache in our backing device to deal with. | |
450 | */ | |
451 | if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE)) | |
452 | bs->enable_write_cache = 1; | |
453 | ||
15dc2697 CH |
454 | /* |
455 | * Clear flags that are internal to the block layer before opening the | |
456 | * image. | |
457 | */ | |
458 | open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
459 | ||
460 | /* | |
461 | * Snapshots should be writeable. | |
462 | * | |
463 | * XXX(hch): and what is the point of a snapshot during a read-only open? | |
464 | */ | |
465 | if (!(flags & BDRV_O_FILE) && bs->is_temporary) { | |
466 | open_flags |= BDRV_O_RDWR; | |
f5edb014 | 467 | } |
6987307c CH |
468 | |
469 | ret = drv->bdrv_open(bs, filename, open_flags); | |
ea2384d3 | 470 | if (ret < 0) { |
6987307c | 471 | goto free_and_fail; |
33e3963e | 472 | } |
6987307c | 473 | |
4dca4b63 | 474 | bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR); |
d15a771d | 475 | if (drv->bdrv_getlength) { |
6ea44308 | 476 | bs->total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
d15a771d | 477 | } |
67b915a5 | 478 | #ifndef _WIN32 |
ea2384d3 FB |
479 | if (bs->is_temporary) { |
480 | unlink(filename); | |
481 | } | |
482 | #endif | |
b783e409 | 483 | if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') { |
ea2384d3 | 484 | /* if there is a backing file, use it */ |
5eb45639 | 485 | BlockDriver *back_drv = NULL; |
ea2384d3 | 486 | bs->backing_hd = bdrv_new(""); |
83f64091 FB |
487 | path_combine(backing_filename, sizeof(backing_filename), |
488 | filename, bs->backing_file); | |
5eb45639 AL |
489 | if (bs->backing_format[0] != '\0') |
490 | back_drv = bdrv_find_format(bs->backing_format); | |
4dca4b63 NS |
491 | |
492 | /* backing files always opened read-only */ | |
493 | open_flags &= ~BDRV_O_RDWR; | |
494 | ||
5eb45639 AL |
495 | ret = bdrv_open2(bs->backing_hd, backing_filename, open_flags, |
496 | back_drv); | |
51d7c00c AL |
497 | if (ret < 0) { |
498 | bdrv_close(bs); | |
499 | return ret; | |
500 | } | |
4dca4b63 NS |
501 | if (bs->is_temporary) { |
502 | bs->backing_hd->keep_read_only = !(flags & BDRV_O_RDWR); | |
503 | } else { | |
504 | /* base image inherits from "parent" */ | |
505 | bs->backing_hd->keep_read_only = bs->keep_read_only; | |
506 | } | |
33e3963e FB |
507 | } |
508 | ||
bb5fc20f AL |
509 | if (!bdrv_key_required(bs)) { |
510 | /* call the change callback */ | |
511 | bs->media_changed = 1; | |
512 | if (bs->change_cb) | |
513 | bs->change_cb(bs->change_opaque); | |
514 | } | |
b338082b | 515 | return 0; |
6987307c CH |
516 | |
517 | free_and_fail: | |
518 | qemu_free(bs->opaque); | |
519 | bs->opaque = NULL; | |
520 | bs->drv = NULL; | |
521 | unlink_and_fail: | |
522 | if (bs->is_temporary) | |
523 | unlink(filename); | |
524 | return ret; | |
fc01f7e7 FB |
525 | } |
526 | ||
527 | void bdrv_close(BlockDriverState *bs) | |
528 | { | |
19cb3738 | 529 | if (bs->drv) { |
ea2384d3 FB |
530 | if (bs->backing_hd) |
531 | bdrv_delete(bs->backing_hd); | |
532 | bs->drv->bdrv_close(bs); | |
533 | qemu_free(bs->opaque); | |
534 | #ifdef _WIN32 | |
535 | if (bs->is_temporary) { | |
536 | unlink(bs->filename); | |
537 | } | |
67b915a5 | 538 | #endif |
ea2384d3 FB |
539 | bs->opaque = NULL; |
540 | bs->drv = NULL; | |
b338082b FB |
541 | |
542 | /* call the change callback */ | |
19cb3738 | 543 | bs->media_changed = 1; |
b338082b FB |
544 | if (bs->change_cb) |
545 | bs->change_cb(bs->change_opaque); | |
546 | } | |
547 | } | |
548 | ||
549 | void bdrv_delete(BlockDriverState *bs) | |
550 | { | |
34c6f050 AJ |
551 | BlockDriverState **pbs; |
552 | ||
553 | pbs = &bdrv_first; | |
554 | while (*pbs != bs && *pbs != NULL) | |
555 | pbs = &(*pbs)->next; | |
556 | if (*pbs == bs) | |
557 | *pbs = bs->next; | |
558 | ||
b338082b FB |
559 | bdrv_close(bs); |
560 | qemu_free(bs); | |
fc01f7e7 FB |
561 | } |
562 | ||
e97fc193 AL |
563 | /* |
564 | * Run consistency checks on an image | |
565 | * | |
566 | * Returns the number of errors or -errno when an internal error occurs | |
567 | */ | |
568 | int bdrv_check(BlockDriverState *bs) | |
569 | { | |
570 | if (bs->drv->bdrv_check == NULL) { | |
571 | return -ENOTSUP; | |
572 | } | |
573 | ||
574 | return bs->drv->bdrv_check(bs); | |
575 | } | |
576 | ||
33e3963e FB |
577 | /* commit COW file into the raw image */ |
578 | int bdrv_commit(BlockDriverState *bs) | |
579 | { | |
19cb3738 | 580 | BlockDriver *drv = bs->drv; |
83f64091 | 581 | int64_t i, total_sectors; |
4dca4b63 NS |
582 | int n, j, ro, open_flags; |
583 | int ret = 0, rw_ret = 0; | |
ea2384d3 | 584 | unsigned char sector[512]; |
4dca4b63 NS |
585 | char filename[1024]; |
586 | BlockDriverState *bs_rw, *bs_ro; | |
33e3963e | 587 | |
19cb3738 FB |
588 | if (!drv) |
589 | return -ENOMEDIUM; | |
4dca4b63 NS |
590 | |
591 | if (!bs->backing_hd) { | |
592 | return -ENOTSUP; | |
33e3963e FB |
593 | } |
594 | ||
4dca4b63 NS |
595 | if (bs->backing_hd->keep_read_only) { |
596 | return -EACCES; | |
597 | } | |
598 | ||
599 | ro = bs->backing_hd->read_only; | |
600 | strncpy(filename, bs->backing_hd->filename, sizeof(filename)); | |
601 | open_flags = bs->backing_hd->open_flags; | |
602 | ||
603 | if (ro) { | |
604 | /* re-open as RW */ | |
605 | bdrv_delete(bs->backing_hd); | |
606 | bs->backing_hd = NULL; | |
607 | bs_rw = bdrv_new(""); | |
608 | rw_ret = bdrv_open2(bs_rw, filename, open_flags | BDRV_O_RDWR, NULL); | |
609 | if (rw_ret < 0) { | |
610 | bdrv_delete(bs_rw); | |
611 | /* try to re-open read-only */ | |
612 | bs_ro = bdrv_new(""); | |
613 | ret = bdrv_open2(bs_ro, filename, open_flags & ~BDRV_O_RDWR, NULL); | |
614 | if (ret < 0) { | |
615 | bdrv_delete(bs_ro); | |
616 | /* drive not functional anymore */ | |
617 | bs->drv = NULL; | |
618 | return ret; | |
619 | } | |
620 | bs->backing_hd = bs_ro; | |
621 | return rw_ret; | |
622 | } | |
623 | bs->backing_hd = bs_rw; | |
ea2384d3 | 624 | } |
33e3963e | 625 | |
6ea44308 | 626 | total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
83f64091 | 627 | for (i = 0; i < total_sectors;) { |
19cb3738 | 628 | if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { |
ea2384d3 FB |
629 | for(j = 0; j < n; j++) { |
630 | if (bdrv_read(bs, i, sector, 1) != 0) { | |
4dca4b63 NS |
631 | ret = -EIO; |
632 | goto ro_cleanup; | |
ea2384d3 FB |
633 | } |
634 | ||
635 | if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { | |
4dca4b63 NS |
636 | ret = -EIO; |
637 | goto ro_cleanup; | |
ea2384d3 FB |
638 | } |
639 | i++; | |
33e3963e | 640 | } |
ea2384d3 FB |
641 | } else { |
642 | i += n; | |
643 | } | |
33e3963e | 644 | } |
95389c86 | 645 | |
1d44952f CH |
646 | if (drv->bdrv_make_empty) { |
647 | ret = drv->bdrv_make_empty(bs); | |
648 | bdrv_flush(bs); | |
649 | } | |
95389c86 | 650 | |
3f5075ae CH |
651 | /* |
652 | * Make sure all data we wrote to the backing device is actually | |
653 | * stable on disk. | |
654 | */ | |
655 | if (bs->backing_hd) | |
656 | bdrv_flush(bs->backing_hd); | |
4dca4b63 NS |
657 | |
658 | ro_cleanup: | |
659 | ||
660 | if (ro) { | |
661 | /* re-open as RO */ | |
662 | bdrv_delete(bs->backing_hd); | |
663 | bs->backing_hd = NULL; | |
664 | bs_ro = bdrv_new(""); | |
665 | ret = bdrv_open2(bs_ro, filename, open_flags & ~BDRV_O_RDWR, NULL); | |
666 | if (ret < 0) { | |
667 | bdrv_delete(bs_ro); | |
668 | /* drive not functional anymore */ | |
669 | bs->drv = NULL; | |
670 | return ret; | |
671 | } | |
672 | bs->backing_hd = bs_ro; | |
673 | bs->backing_hd->keep_read_only = 0; | |
674 | } | |
675 | ||
1d44952f | 676 | return ret; |
33e3963e FB |
677 | } |
678 | ||
756e6736 KW |
679 | /* |
680 | * Return values: | |
681 | * 0 - success | |
682 | * -EINVAL - backing format specified, but no file | |
683 | * -ENOSPC - can't update the backing file because no space is left in the | |
684 | * image file header | |
685 | * -ENOTSUP - format driver doesn't support changing the backing file | |
686 | */ | |
687 | int bdrv_change_backing_file(BlockDriverState *bs, | |
688 | const char *backing_file, const char *backing_fmt) | |
689 | { | |
690 | BlockDriver *drv = bs->drv; | |
691 | ||
692 | if (drv->bdrv_change_backing_file != NULL) { | |
693 | return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); | |
694 | } else { | |
695 | return -ENOTSUP; | |
696 | } | |
697 | } | |
698 | ||
71d0770c AL |
699 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
700 | size_t size) | |
701 | { | |
702 | int64_t len; | |
703 | ||
704 | if (!bdrv_is_inserted(bs)) | |
705 | return -ENOMEDIUM; | |
706 | ||
707 | if (bs->growable) | |
708 | return 0; | |
709 | ||
710 | len = bdrv_getlength(bs); | |
711 | ||
fbb7b4e0 KW |
712 | if (offset < 0) |
713 | return -EIO; | |
714 | ||
715 | if ((offset > len) || (len - offset < size)) | |
71d0770c AL |
716 | return -EIO; |
717 | ||
718 | return 0; | |
719 | } | |
720 | ||
721 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, | |
722 | int nb_sectors) | |
723 | { | |
999dec57 | 724 | return bdrv_check_byte_request(bs, sector_num * 512, nb_sectors * 512); |
71d0770c AL |
725 | } |
726 | ||
19cb3738 | 727 | /* return < 0 if error. See bdrv_write() for the return codes */ |
5fafdf24 | 728 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
729 | uint8_t *buf, int nb_sectors) |
730 | { | |
ea2384d3 FB |
731 | BlockDriver *drv = bs->drv; |
732 | ||
19cb3738 FB |
733 | if (!drv) |
734 | return -ENOMEDIUM; | |
71d0770c AL |
735 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
736 | return -EIO; | |
b338082b | 737 | |
eda578e5 | 738 | return drv->bdrv_read(bs, sector_num, buf, nb_sectors); |
fc01f7e7 FB |
739 | } |
740 | ||
7cd1e32a | 741 | static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num, |
a55eb92c | 742 | int nb_sectors, int dirty) |
7cd1e32a | 743 | { |
744 | int64_t start, end; | |
c6d22830 | 745 | unsigned long val, idx, bit; |
a55eb92c | 746 | |
6ea44308 | 747 | start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; |
c6d22830 | 748 | end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK; |
a55eb92c JK |
749 | |
750 | for (; start <= end; start++) { | |
c6d22830 JK |
751 | idx = start / (sizeof(unsigned long) * 8); |
752 | bit = start % (sizeof(unsigned long) * 8); | |
753 | val = bs->dirty_bitmap[idx]; | |
754 | if (dirty) { | |
aaa0eb75 LS |
755 | if (!(val & (1 << bit))) { |
756 | bs->dirty_count++; | |
757 | val |= 1 << bit; | |
758 | } | |
c6d22830 | 759 | } else { |
aaa0eb75 LS |
760 | if (val & (1 << bit)) { |
761 | bs->dirty_count--; | |
762 | val &= ~(1 << bit); | |
763 | } | |
c6d22830 JK |
764 | } |
765 | bs->dirty_bitmap[idx] = val; | |
7cd1e32a | 766 | } |
767 | } | |
768 | ||
5fafdf24 | 769 | /* Return < 0 if error. Important errors are: |
19cb3738 FB |
770 | -EIO generic I/O error (may happen for all errors) |
771 | -ENOMEDIUM No media inserted. | |
772 | -EINVAL Invalid sector number or nb_sectors | |
773 | -EACCES Trying to write a read-only device | |
774 | */ | |
5fafdf24 | 775 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
776 | const uint8_t *buf, int nb_sectors) |
777 | { | |
83f64091 | 778 | BlockDriver *drv = bs->drv; |
19cb3738 FB |
779 | if (!bs->drv) |
780 | return -ENOMEDIUM; | |
0849bf08 | 781 | if (bs->read_only) |
19cb3738 | 782 | return -EACCES; |
71d0770c AL |
783 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
784 | return -EIO; | |
a55eb92c | 785 | |
c6d22830 | 786 | if (bs->dirty_bitmap) { |
7cd1e32a | 787 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
788 | } | |
a55eb92c | 789 | |
42fb2807 | 790 | return drv->bdrv_write(bs, sector_num, buf, nb_sectors); |
83f64091 FB |
791 | } |
792 | ||
eda578e5 AL |
793 | int bdrv_pread(BlockDriverState *bs, int64_t offset, |
794 | void *buf, int count1) | |
83f64091 | 795 | { |
6ea44308 | 796 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
797 | int len, nb_sectors, count; |
798 | int64_t sector_num; | |
9a8c4cce | 799 | int ret; |
83f64091 FB |
800 | |
801 | count = count1; | |
802 | /* first read to align to sector start */ | |
6ea44308 | 803 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
804 | if (len > count) |
805 | len = count; | |
6ea44308 | 806 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 807 | if (len > 0) { |
9a8c4cce KW |
808 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
809 | return ret; | |
6ea44308 | 810 | memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len); |
83f64091 FB |
811 | count -= len; |
812 | if (count == 0) | |
813 | return count1; | |
814 | sector_num++; | |
815 | buf += len; | |
816 | } | |
817 | ||
818 | /* read the sectors "in place" */ | |
6ea44308 | 819 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 820 | if (nb_sectors > 0) { |
9a8c4cce KW |
821 | if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0) |
822 | return ret; | |
83f64091 | 823 | sector_num += nb_sectors; |
6ea44308 | 824 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
825 | buf += len; |
826 | count -= len; | |
827 | } | |
828 | ||
829 | /* add data from the last sector */ | |
830 | if (count > 0) { | |
9a8c4cce KW |
831 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
832 | return ret; | |
83f64091 FB |
833 | memcpy(buf, tmp_buf, count); |
834 | } | |
835 | return count1; | |
836 | } | |
837 | ||
eda578e5 AL |
838 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, |
839 | const void *buf, int count1) | |
83f64091 | 840 | { |
6ea44308 | 841 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
842 | int len, nb_sectors, count; |
843 | int64_t sector_num; | |
9a8c4cce | 844 | int ret; |
83f64091 FB |
845 | |
846 | count = count1; | |
847 | /* first write to align to sector start */ | |
6ea44308 | 848 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
849 | if (len > count) |
850 | len = count; | |
6ea44308 | 851 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 852 | if (len > 0) { |
9a8c4cce KW |
853 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
854 | return ret; | |
6ea44308 | 855 | memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len); |
9a8c4cce KW |
856 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
857 | return ret; | |
83f64091 FB |
858 | count -= len; |
859 | if (count == 0) | |
860 | return count1; | |
861 | sector_num++; | |
862 | buf += len; | |
863 | } | |
864 | ||
865 | /* write the sectors "in place" */ | |
6ea44308 | 866 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 867 | if (nb_sectors > 0) { |
9a8c4cce KW |
868 | if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0) |
869 | return ret; | |
83f64091 | 870 | sector_num += nb_sectors; |
6ea44308 | 871 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
872 | buf += len; |
873 | count -= len; | |
874 | } | |
875 | ||
876 | /* add data from the last sector */ | |
877 | if (count > 0) { | |
9a8c4cce KW |
878 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
879 | return ret; | |
83f64091 | 880 | memcpy(tmp_buf, buf, count); |
9a8c4cce KW |
881 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
882 | return ret; | |
83f64091 FB |
883 | } |
884 | return count1; | |
885 | } | |
83f64091 | 886 | |
83f64091 FB |
887 | /** |
888 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
889 | */ | |
890 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
891 | { | |
892 | BlockDriver *drv = bs->drv; | |
893 | if (!drv) | |
19cb3738 | 894 | return -ENOMEDIUM; |
83f64091 FB |
895 | if (!drv->bdrv_truncate) |
896 | return -ENOTSUP; | |
59f2689d NS |
897 | if (bs->read_only) |
898 | return -EACCES; | |
83f64091 FB |
899 | return drv->bdrv_truncate(bs, offset); |
900 | } | |
901 | ||
902 | /** | |
903 | * Length of a file in bytes. Return < 0 if error or unknown. | |
904 | */ | |
905 | int64_t bdrv_getlength(BlockDriverState *bs) | |
906 | { | |
907 | BlockDriver *drv = bs->drv; | |
908 | if (!drv) | |
19cb3738 | 909 | return -ENOMEDIUM; |
83f64091 FB |
910 | if (!drv->bdrv_getlength) { |
911 | /* legacy mode */ | |
6ea44308 | 912 | return bs->total_sectors * BDRV_SECTOR_SIZE; |
83f64091 FB |
913 | } |
914 | return drv->bdrv_getlength(bs); | |
fc01f7e7 FB |
915 | } |
916 | ||
19cb3738 | 917 | /* return 0 as number of sectors if no device present or error */ |
96b8f136 | 918 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
fc01f7e7 | 919 | { |
19cb3738 FB |
920 | int64_t length; |
921 | length = bdrv_getlength(bs); | |
922 | if (length < 0) | |
923 | length = 0; | |
924 | else | |
6ea44308 | 925 | length = length >> BDRV_SECTOR_BITS; |
19cb3738 | 926 | *nb_sectors_ptr = length; |
fc01f7e7 | 927 | } |
cf98951b | 928 | |
f3d54fc4 AL |
929 | struct partition { |
930 | uint8_t boot_ind; /* 0x80 - active */ | |
931 | uint8_t head; /* starting head */ | |
932 | uint8_t sector; /* starting sector */ | |
933 | uint8_t cyl; /* starting cylinder */ | |
934 | uint8_t sys_ind; /* What partition type */ | |
935 | uint8_t end_head; /* end head */ | |
936 | uint8_t end_sector; /* end sector */ | |
937 | uint8_t end_cyl; /* end cylinder */ | |
938 | uint32_t start_sect; /* starting sector counting from 0 */ | |
939 | uint32_t nr_sects; /* nr of sectors in partition */ | |
940 | } __attribute__((packed)); | |
941 | ||
942 | /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */ | |
943 | static int guess_disk_lchs(BlockDriverState *bs, | |
944 | int *pcylinders, int *pheads, int *psectors) | |
945 | { | |
946 | uint8_t buf[512]; | |
947 | int ret, i, heads, sectors, cylinders; | |
948 | struct partition *p; | |
949 | uint32_t nr_sects; | |
a38131b6 | 950 | uint64_t nb_sectors; |
f3d54fc4 AL |
951 | |
952 | bdrv_get_geometry(bs, &nb_sectors); | |
953 | ||
954 | ret = bdrv_read(bs, 0, buf, 1); | |
955 | if (ret < 0) | |
956 | return -1; | |
957 | /* test msdos magic */ | |
958 | if (buf[510] != 0x55 || buf[511] != 0xaa) | |
959 | return -1; | |
960 | for(i = 0; i < 4; i++) { | |
961 | p = ((struct partition *)(buf + 0x1be)) + i; | |
962 | nr_sects = le32_to_cpu(p->nr_sects); | |
963 | if (nr_sects && p->end_head) { | |
964 | /* We make the assumption that the partition terminates on | |
965 | a cylinder boundary */ | |
966 | heads = p->end_head + 1; | |
967 | sectors = p->end_sector & 63; | |
968 | if (sectors == 0) | |
969 | continue; | |
970 | cylinders = nb_sectors / (heads * sectors); | |
971 | if (cylinders < 1 || cylinders > 16383) | |
972 | continue; | |
973 | *pheads = heads; | |
974 | *psectors = sectors; | |
975 | *pcylinders = cylinders; | |
976 | #if 0 | |
977 | printf("guessed geometry: LCHS=%d %d %d\n", | |
978 | cylinders, heads, sectors); | |
979 | #endif | |
980 | return 0; | |
981 | } | |
982 | } | |
983 | return -1; | |
984 | } | |
985 | ||
986 | void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) | |
987 | { | |
988 | int translation, lba_detected = 0; | |
989 | int cylinders, heads, secs; | |
a38131b6 | 990 | uint64_t nb_sectors; |
f3d54fc4 AL |
991 | |
992 | /* if a geometry hint is available, use it */ | |
993 | bdrv_get_geometry(bs, &nb_sectors); | |
994 | bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); | |
995 | translation = bdrv_get_translation_hint(bs); | |
996 | if (cylinders != 0) { | |
997 | *pcyls = cylinders; | |
998 | *pheads = heads; | |
999 | *psecs = secs; | |
1000 | } else { | |
1001 | if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { | |
1002 | if (heads > 16) { | |
1003 | /* if heads > 16, it means that a BIOS LBA | |
1004 | translation was active, so the default | |
1005 | hardware geometry is OK */ | |
1006 | lba_detected = 1; | |
1007 | goto default_geometry; | |
1008 | } else { | |
1009 | *pcyls = cylinders; | |
1010 | *pheads = heads; | |
1011 | *psecs = secs; | |
1012 | /* disable any translation to be in sync with | |
1013 | the logical geometry */ | |
1014 | if (translation == BIOS_ATA_TRANSLATION_AUTO) { | |
1015 | bdrv_set_translation_hint(bs, | |
1016 | BIOS_ATA_TRANSLATION_NONE); | |
1017 | } | |
1018 | } | |
1019 | } else { | |
1020 | default_geometry: | |
1021 | /* if no geometry, use a standard physical disk geometry */ | |
1022 | cylinders = nb_sectors / (16 * 63); | |
1023 | ||
1024 | if (cylinders > 16383) | |
1025 | cylinders = 16383; | |
1026 | else if (cylinders < 2) | |
1027 | cylinders = 2; | |
1028 | *pcyls = cylinders; | |
1029 | *pheads = 16; | |
1030 | *psecs = 63; | |
1031 | if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { | |
1032 | if ((*pcyls * *pheads) <= 131072) { | |
1033 | bdrv_set_translation_hint(bs, | |
1034 | BIOS_ATA_TRANSLATION_LARGE); | |
1035 | } else { | |
1036 | bdrv_set_translation_hint(bs, | |
1037 | BIOS_ATA_TRANSLATION_LBA); | |
1038 | } | |
1039 | } | |
1040 | } | |
1041 | bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); | |
1042 | } | |
1043 | } | |
1044 | ||
5fafdf24 | 1045 | void bdrv_set_geometry_hint(BlockDriverState *bs, |
b338082b FB |
1046 | int cyls, int heads, int secs) |
1047 | { | |
1048 | bs->cyls = cyls; | |
1049 | bs->heads = heads; | |
1050 | bs->secs = secs; | |
1051 | } | |
1052 | ||
1053 | void bdrv_set_type_hint(BlockDriverState *bs, int type) | |
1054 | { | |
1055 | bs->type = type; | |
1056 | bs->removable = ((type == BDRV_TYPE_CDROM || | |
1057 | type == BDRV_TYPE_FLOPPY)); | |
1058 | } | |
1059 | ||
46d4767d FB |
1060 | void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
1061 | { | |
1062 | bs->translation = translation; | |
1063 | } | |
1064 | ||
5fafdf24 | 1065 | void bdrv_get_geometry_hint(BlockDriverState *bs, |
b338082b FB |
1066 | int *pcyls, int *pheads, int *psecs) |
1067 | { | |
1068 | *pcyls = bs->cyls; | |
1069 | *pheads = bs->heads; | |
1070 | *psecs = bs->secs; | |
1071 | } | |
1072 | ||
1073 | int bdrv_get_type_hint(BlockDriverState *bs) | |
1074 | { | |
1075 | return bs->type; | |
1076 | } | |
1077 | ||
46d4767d FB |
1078 | int bdrv_get_translation_hint(BlockDriverState *bs) |
1079 | { | |
1080 | return bs->translation; | |
1081 | } | |
1082 | ||
b338082b FB |
1083 | int bdrv_is_removable(BlockDriverState *bs) |
1084 | { | |
1085 | return bs->removable; | |
1086 | } | |
1087 | ||
1088 | int bdrv_is_read_only(BlockDriverState *bs) | |
1089 | { | |
1090 | return bs->read_only; | |
1091 | } | |
1092 | ||
985a03b0 TS |
1093 | int bdrv_is_sg(BlockDriverState *bs) |
1094 | { | |
1095 | return bs->sg; | |
1096 | } | |
1097 | ||
e900a7b7 CH |
1098 | int bdrv_enable_write_cache(BlockDriverState *bs) |
1099 | { | |
1100 | return bs->enable_write_cache; | |
1101 | } | |
1102 | ||
19cb3738 | 1103 | /* XXX: no longer used */ |
5fafdf24 | 1104 | void bdrv_set_change_cb(BlockDriverState *bs, |
b338082b FB |
1105 | void (*change_cb)(void *opaque), void *opaque) |
1106 | { | |
1107 | bs->change_cb = change_cb; | |
1108 | bs->change_opaque = opaque; | |
1109 | } | |
1110 | ||
ea2384d3 FB |
1111 | int bdrv_is_encrypted(BlockDriverState *bs) |
1112 | { | |
1113 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
1114 | return 1; | |
1115 | return bs->encrypted; | |
1116 | } | |
1117 | ||
c0f4ce77 AL |
1118 | int bdrv_key_required(BlockDriverState *bs) |
1119 | { | |
1120 | BlockDriverState *backing_hd = bs->backing_hd; | |
1121 | ||
1122 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) | |
1123 | return 1; | |
1124 | return (bs->encrypted && !bs->valid_key); | |
1125 | } | |
1126 | ||
ea2384d3 FB |
1127 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
1128 | { | |
1129 | int ret; | |
1130 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
1131 | ret = bdrv_set_key(bs->backing_hd, key); | |
1132 | if (ret < 0) | |
1133 | return ret; | |
1134 | if (!bs->encrypted) | |
1135 | return 0; | |
1136 | } | |
fd04a2ae SH |
1137 | if (!bs->encrypted) { |
1138 | return -EINVAL; | |
1139 | } else if (!bs->drv || !bs->drv->bdrv_set_key) { | |
1140 | return -ENOMEDIUM; | |
1141 | } | |
c0f4ce77 | 1142 | ret = bs->drv->bdrv_set_key(bs, key); |
bb5fc20f AL |
1143 | if (ret < 0) { |
1144 | bs->valid_key = 0; | |
1145 | } else if (!bs->valid_key) { | |
1146 | bs->valid_key = 1; | |
1147 | /* call the change callback now, we skipped it on open */ | |
1148 | bs->media_changed = 1; | |
1149 | if (bs->change_cb) | |
1150 | bs->change_cb(bs->change_opaque); | |
1151 | } | |
c0f4ce77 | 1152 | return ret; |
ea2384d3 FB |
1153 | } |
1154 | ||
1155 | void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) | |
1156 | { | |
19cb3738 | 1157 | if (!bs->drv) { |
ea2384d3 FB |
1158 | buf[0] = '\0'; |
1159 | } else { | |
1160 | pstrcpy(buf, buf_size, bs->drv->format_name); | |
1161 | } | |
1162 | } | |
1163 | ||
5fafdf24 | 1164 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
ea2384d3 FB |
1165 | void *opaque) |
1166 | { | |
1167 | BlockDriver *drv; | |
1168 | ||
1169 | for (drv = first_drv; drv != NULL; drv = drv->next) { | |
1170 | it(opaque, drv->format_name); | |
1171 | } | |
1172 | } | |
1173 | ||
b338082b FB |
1174 | BlockDriverState *bdrv_find(const char *name) |
1175 | { | |
1176 | BlockDriverState *bs; | |
1177 | ||
1178 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
1179 | if (!strcmp(name, bs->device_name)) | |
1180 | return bs; | |
1181 | } | |
1182 | return NULL; | |
1183 | } | |
1184 | ||
51de9760 | 1185 | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
81d0912d FB |
1186 | { |
1187 | BlockDriverState *bs; | |
1188 | ||
1189 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
51de9760 | 1190 | it(opaque, bs); |
81d0912d FB |
1191 | } |
1192 | } | |
1193 | ||
ea2384d3 FB |
1194 | const char *bdrv_get_device_name(BlockDriverState *bs) |
1195 | { | |
1196 | return bs->device_name; | |
1197 | } | |
1198 | ||
7a6cba61 PB |
1199 | void bdrv_flush(BlockDriverState *bs) |
1200 | { | |
3f5075ae | 1201 | if (bs->drv && bs->drv->bdrv_flush) |
7a6cba61 | 1202 | bs->drv->bdrv_flush(bs); |
7a6cba61 PB |
1203 | } |
1204 | ||
c6ca28d6 AL |
1205 | void bdrv_flush_all(void) |
1206 | { | |
1207 | BlockDriverState *bs; | |
1208 | ||
1209 | for (bs = bdrv_first; bs != NULL; bs = bs->next) | |
1210 | if (bs->drv && !bdrv_is_read_only(bs) && | |
1211 | (!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) | |
1212 | bdrv_flush(bs); | |
1213 | } | |
1214 | ||
f58c7b35 TS |
1215 | /* |
1216 | * Returns true iff the specified sector is present in the disk image. Drivers | |
1217 | * not implementing the functionality are assumed to not support backing files, | |
1218 | * hence all their sectors are reported as allocated. | |
1219 | * | |
1220 | * 'pnum' is set to the number of sectors (including and immediately following | |
1221 | * the specified sector) that are known to be in the same | |
1222 | * allocated/unallocated state. | |
1223 | * | |
1224 | * 'nb_sectors' is the max value 'pnum' should be set to. | |
1225 | */ | |
1226 | int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, | |
1227 | int *pnum) | |
1228 | { | |
1229 | int64_t n; | |
1230 | if (!bs->drv->bdrv_is_allocated) { | |
1231 | if (sector_num >= bs->total_sectors) { | |
1232 | *pnum = 0; | |
1233 | return 0; | |
1234 | } | |
1235 | n = bs->total_sectors - sector_num; | |
1236 | *pnum = (n < nb_sectors) ? (n) : (nb_sectors); | |
1237 | return 1; | |
1238 | } | |
1239 | return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum); | |
1240 | } | |
1241 | ||
2582bfed LC |
1242 | void bdrv_mon_event(const BlockDriverState *bdrv, |
1243 | BlockMonEventAction action, int is_read) | |
1244 | { | |
1245 | QObject *data; | |
1246 | const char *action_str; | |
1247 | ||
1248 | switch (action) { | |
1249 | case BDRV_ACTION_REPORT: | |
1250 | action_str = "report"; | |
1251 | break; | |
1252 | case BDRV_ACTION_IGNORE: | |
1253 | action_str = "ignore"; | |
1254 | break; | |
1255 | case BDRV_ACTION_STOP: | |
1256 | action_str = "stop"; | |
1257 | break; | |
1258 | default: | |
1259 | abort(); | |
1260 | } | |
1261 | ||
1262 | data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }", | |
1263 | bdrv->device_name, | |
1264 | action_str, | |
1265 | is_read ? "read" : "write"); | |
1266 | monitor_protocol_event(QEVENT_BLOCK_IO_ERROR, data); | |
1267 | ||
1268 | qobject_decref(data); | |
1269 | } | |
1270 | ||
d15e5465 | 1271 | static void bdrv_print_dict(QObject *obj, void *opaque) |
b338082b | 1272 | { |
d15e5465 LC |
1273 | QDict *bs_dict; |
1274 | Monitor *mon = opaque; | |
1275 | ||
1276 | bs_dict = qobject_to_qdict(obj); | |
1277 | ||
1278 | monitor_printf(mon, "%s: type=%s removable=%d", | |
1279 | qdict_get_str(bs_dict, "device"), | |
1280 | qdict_get_str(bs_dict, "type"), | |
1281 | qdict_get_bool(bs_dict, "removable")); | |
1282 | ||
1283 | if (qdict_get_bool(bs_dict, "removable")) { | |
1284 | monitor_printf(mon, " locked=%d", qdict_get_bool(bs_dict, "locked")); | |
1285 | } | |
1286 | ||
1287 | if (qdict_haskey(bs_dict, "inserted")) { | |
1288 | QDict *qdict = qobject_to_qdict(qdict_get(bs_dict, "inserted")); | |
1289 | ||
1290 | monitor_printf(mon, " file="); | |
1291 | monitor_print_filename(mon, qdict_get_str(qdict, "file")); | |
1292 | if (qdict_haskey(qdict, "backing_file")) { | |
1293 | monitor_printf(mon, " backing_file="); | |
1294 | monitor_print_filename(mon, qdict_get_str(qdict, "backing_file")); | |
1295 | } | |
1296 | monitor_printf(mon, " ro=%d drv=%s encrypted=%d", | |
1297 | qdict_get_bool(qdict, "ro"), | |
1298 | qdict_get_str(qdict, "drv"), | |
1299 | qdict_get_bool(qdict, "encrypted")); | |
1300 | } else { | |
1301 | monitor_printf(mon, " [not inserted]"); | |
1302 | } | |
1303 | ||
1304 | monitor_printf(mon, "\n"); | |
1305 | } | |
1306 | ||
1307 | void bdrv_info_print(Monitor *mon, const QObject *data) | |
1308 | { | |
1309 | qlist_iter(qobject_to_qlist(data), bdrv_print_dict, mon); | |
1310 | } | |
1311 | ||
1312 | /** | |
1313 | * bdrv_info(): Block devices information | |
1314 | * | |
1315 | * Each block device information is stored in a QDict and the | |
1316 | * returned QObject is a QList of all devices. | |
1317 | * | |
1318 | * The QDict contains the following: | |
1319 | * | |
1320 | * - "device": device name | |
1321 | * - "type": device type | |
1322 | * - "removable": true if the device is removable, false otherwise | |
1323 | * - "locked": true if the device is locked, false otherwise | |
1324 | * - "inserted": only present if the device is inserted, it is a QDict | |
1325 | * containing the following: | |
1326 | * - "file": device file name | |
1327 | * - "ro": true if read-only, false otherwise | |
1328 | * - "drv": driver format name | |
1329 | * - "backing_file": backing file name if one is used | |
1330 | * - "encrypted": true if encrypted, false otherwise | |
1331 | * | |
1332 | * Example: | |
1333 | * | |
1334 | * [ { "device": "ide0-hd0", "type": "hd", "removable": false, "locked": false, | |
1335 | * "inserted": { "file": "/tmp/foobar", "ro": false, "drv": "qcow2" } }, | |
1336 | * { "device": "floppy0", "type": "floppy", "removable": true, | |
1337 | * "locked": false } ] | |
1338 | */ | |
1339 | void bdrv_info(Monitor *mon, QObject **ret_data) | |
1340 | { | |
1341 | QList *bs_list; | |
b338082b FB |
1342 | BlockDriverState *bs; |
1343 | ||
d15e5465 LC |
1344 | bs_list = qlist_new(); |
1345 | ||
b338082b | 1346 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
d15e5465 LC |
1347 | QObject *bs_obj; |
1348 | const char *type = "unknown"; | |
1349 | ||
b338082b FB |
1350 | switch(bs->type) { |
1351 | case BDRV_TYPE_HD: | |
d15e5465 | 1352 | type = "hd"; |
b338082b FB |
1353 | break; |
1354 | case BDRV_TYPE_CDROM: | |
d15e5465 | 1355 | type = "cdrom"; |
b338082b FB |
1356 | break; |
1357 | case BDRV_TYPE_FLOPPY: | |
d15e5465 | 1358 | type = "floppy"; |
b338082b FB |
1359 | break; |
1360 | } | |
d15e5465 LC |
1361 | |
1362 | bs_obj = qobject_from_jsonf("{ 'device': %s, 'type': %s, " | |
1363 | "'removable': %i, 'locked': %i }", | |
1364 | bs->device_name, type, bs->removable, | |
1365 | bs->locked); | |
d15e5465 | 1366 | |
19cb3738 | 1367 | if (bs->drv) { |
d15e5465 LC |
1368 | QObject *obj; |
1369 | QDict *bs_dict = qobject_to_qdict(bs_obj); | |
1370 | ||
1371 | obj = qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, " | |
1372 | "'encrypted': %i }", | |
1373 | bs->filename, bs->read_only, | |
1374 | bs->drv->format_name, | |
1375 | bdrv_is_encrypted(bs)); | |
fef30743 | 1376 | if (bs->backing_file[0] != '\0') { |
d15e5465 LC |
1377 | QDict *qdict = qobject_to_qdict(obj); |
1378 | qdict_put(qdict, "backing_file", | |
1379 | qstring_from_str(bs->backing_file)); | |
376253ec | 1380 | } |
d15e5465 LC |
1381 | |
1382 | qdict_put_obj(bs_dict, "inserted", obj); | |
b338082b | 1383 | } |
d15e5465 | 1384 | qlist_append_obj(bs_list, bs_obj); |
b338082b | 1385 | } |
d15e5465 LC |
1386 | |
1387 | *ret_data = QOBJECT(bs_list); | |
b338082b | 1388 | } |
a36e69dd | 1389 | |
218a536a | 1390 | static void bdrv_stats_iter(QObject *data, void *opaque) |
a36e69dd | 1391 | { |
218a536a LC |
1392 | QDict *qdict; |
1393 | Monitor *mon = opaque; | |
1394 | ||
1395 | qdict = qobject_to_qdict(data); | |
1396 | monitor_printf(mon, "%s:", qdict_get_str(qdict, "device")); | |
1397 | ||
1398 | qdict = qobject_to_qdict(qdict_get(qdict, "stats")); | |
1399 | monitor_printf(mon, " rd_bytes=%" PRId64 | |
1400 | " wr_bytes=%" PRId64 | |
1401 | " rd_operations=%" PRId64 | |
1402 | " wr_operations=%" PRId64 | |
1403 | "\n", | |
1404 | qdict_get_int(qdict, "rd_bytes"), | |
1405 | qdict_get_int(qdict, "wr_bytes"), | |
1406 | qdict_get_int(qdict, "rd_operations"), | |
1407 | qdict_get_int(qdict, "wr_operations")); | |
1408 | } | |
1409 | ||
1410 | void bdrv_stats_print(Monitor *mon, const QObject *data) | |
1411 | { | |
1412 | qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon); | |
1413 | } | |
1414 | ||
1415 | /** | |
1416 | * bdrv_info_stats(): show block device statistics | |
1417 | * | |
1418 | * Each device statistic information is stored in a QDict and | |
1419 | * the returned QObject is a QList of all devices. | |
1420 | * | |
1421 | * The QDict contains the following: | |
1422 | * | |
1423 | * - "device": device name | |
1424 | * - "stats": A QDict with the statistics information, it contains: | |
1425 | * - "rd_bytes": bytes read | |
1426 | * - "wr_bytes": bytes written | |
1427 | * - "rd_operations": read operations | |
1428 | * - "wr_operations": write operations | |
1429 | * | |
1430 | * Example: | |
1431 | * | |
1432 | * [ { "device": "ide0-hd0", | |
1433 | * "stats": { "rd_bytes": 512, | |
1434 | * "wr_bytes": 0, | |
1435 | * "rd_operations": 1, | |
1436 | * "wr_operations": 0 } }, | |
1437 | * { "device": "ide1-cd0", | |
1438 | * "stats": { "rd_bytes": 0, | |
1439 | * "wr_bytes": 0, | |
1440 | * "rd_operations": 0, | |
1441 | * "wr_operations": 0 } } ] | |
1442 | */ | |
1443 | void bdrv_info_stats(Monitor *mon, QObject **ret_data) | |
1444 | { | |
1445 | QObject *obj; | |
1446 | QList *devices; | |
a36e69dd TS |
1447 | BlockDriverState *bs; |
1448 | ||
218a536a LC |
1449 | devices = qlist_new(); |
1450 | ||
a36e69dd | 1451 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
218a536a LC |
1452 | obj = qobject_from_jsonf("{ 'device': %s, 'stats': {" |
1453 | "'rd_bytes': %" PRId64 "," | |
1454 | "'wr_bytes': %" PRId64 "," | |
1455 | "'rd_operations': %" PRId64 "," | |
1456 | "'wr_operations': %" PRId64 | |
1457 | "} }", | |
1458 | bs->device_name, | |
1459 | bs->rd_bytes, bs->wr_bytes, | |
1460 | bs->rd_ops, bs->wr_ops); | |
218a536a | 1461 | qlist_append_obj(devices, obj); |
a36e69dd | 1462 | } |
218a536a LC |
1463 | |
1464 | *ret_data = QOBJECT(devices); | |
a36e69dd | 1465 | } |
ea2384d3 | 1466 | |
045df330 AL |
1467 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
1468 | { | |
1469 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
1470 | return bs->backing_file; | |
1471 | else if (bs->encrypted) | |
1472 | return bs->filename; | |
1473 | else | |
1474 | return NULL; | |
1475 | } | |
1476 | ||
5fafdf24 | 1477 | void bdrv_get_backing_filename(BlockDriverState *bs, |
83f64091 FB |
1478 | char *filename, int filename_size) |
1479 | { | |
b783e409 | 1480 | if (!bs->backing_file) { |
83f64091 FB |
1481 | pstrcpy(filename, filename_size, ""); |
1482 | } else { | |
1483 | pstrcpy(filename, filename_size, bs->backing_file); | |
1484 | } | |
1485 | } | |
1486 | ||
5fafdf24 | 1487 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
faea38e7 FB |
1488 | const uint8_t *buf, int nb_sectors) |
1489 | { | |
1490 | BlockDriver *drv = bs->drv; | |
1491 | if (!drv) | |
19cb3738 | 1492 | return -ENOMEDIUM; |
faea38e7 FB |
1493 | if (!drv->bdrv_write_compressed) |
1494 | return -ENOTSUP; | |
fbb7b4e0 KW |
1495 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
1496 | return -EIO; | |
a55eb92c | 1497 | |
c6d22830 | 1498 | if (bs->dirty_bitmap) { |
7cd1e32a | 1499 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
1500 | } | |
a55eb92c | 1501 | |
faea38e7 FB |
1502 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
1503 | } | |
3b46e624 | 1504 | |
faea38e7 FB |
1505 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
1506 | { | |
1507 | BlockDriver *drv = bs->drv; | |
1508 | if (!drv) | |
19cb3738 | 1509 | return -ENOMEDIUM; |
faea38e7 FB |
1510 | if (!drv->bdrv_get_info) |
1511 | return -ENOTSUP; | |
1512 | memset(bdi, 0, sizeof(*bdi)); | |
1513 | return drv->bdrv_get_info(bs, bdi); | |
1514 | } | |
1515 | ||
45566e9c CH |
1516 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
1517 | int64_t pos, int size) | |
178e08a5 AL |
1518 | { |
1519 | BlockDriver *drv = bs->drv; | |
1520 | if (!drv) | |
1521 | return -ENOMEDIUM; | |
45566e9c | 1522 | if (!drv->bdrv_save_vmstate) |
178e08a5 | 1523 | return -ENOTSUP; |
45566e9c | 1524 | return drv->bdrv_save_vmstate(bs, buf, pos, size); |
178e08a5 AL |
1525 | } |
1526 | ||
45566e9c CH |
1527 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
1528 | int64_t pos, int size) | |
178e08a5 AL |
1529 | { |
1530 | BlockDriver *drv = bs->drv; | |
1531 | if (!drv) | |
1532 | return -ENOMEDIUM; | |
45566e9c | 1533 | if (!drv->bdrv_load_vmstate) |
178e08a5 | 1534 | return -ENOTSUP; |
45566e9c | 1535 | return drv->bdrv_load_vmstate(bs, buf, pos, size); |
178e08a5 AL |
1536 | } |
1537 | ||
faea38e7 FB |
1538 | /**************************************************************/ |
1539 | /* handling of snapshots */ | |
1540 | ||
5fafdf24 | 1541 | int bdrv_snapshot_create(BlockDriverState *bs, |
faea38e7 FB |
1542 | QEMUSnapshotInfo *sn_info) |
1543 | { | |
1544 | BlockDriver *drv = bs->drv; | |
1545 | if (!drv) | |
19cb3738 | 1546 | return -ENOMEDIUM; |
faea38e7 FB |
1547 | if (!drv->bdrv_snapshot_create) |
1548 | return -ENOTSUP; | |
1549 | return drv->bdrv_snapshot_create(bs, sn_info); | |
1550 | } | |
1551 | ||
5fafdf24 | 1552 | int bdrv_snapshot_goto(BlockDriverState *bs, |
faea38e7 FB |
1553 | const char *snapshot_id) |
1554 | { | |
1555 | BlockDriver *drv = bs->drv; | |
1556 | if (!drv) | |
19cb3738 | 1557 | return -ENOMEDIUM; |
faea38e7 FB |
1558 | if (!drv->bdrv_snapshot_goto) |
1559 | return -ENOTSUP; | |
1560 | return drv->bdrv_snapshot_goto(bs, snapshot_id); | |
1561 | } | |
1562 | ||
1563 | int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) | |
1564 | { | |
1565 | BlockDriver *drv = bs->drv; | |
1566 | if (!drv) | |
19cb3738 | 1567 | return -ENOMEDIUM; |
faea38e7 FB |
1568 | if (!drv->bdrv_snapshot_delete) |
1569 | return -ENOTSUP; | |
1570 | return drv->bdrv_snapshot_delete(bs, snapshot_id); | |
1571 | } | |
1572 | ||
5fafdf24 | 1573 | int bdrv_snapshot_list(BlockDriverState *bs, |
faea38e7 FB |
1574 | QEMUSnapshotInfo **psn_info) |
1575 | { | |
1576 | BlockDriver *drv = bs->drv; | |
1577 | if (!drv) | |
19cb3738 | 1578 | return -ENOMEDIUM; |
faea38e7 FB |
1579 | if (!drv->bdrv_snapshot_list) |
1580 | return -ENOTSUP; | |
1581 | return drv->bdrv_snapshot_list(bs, psn_info); | |
1582 | } | |
1583 | ||
1584 | #define NB_SUFFIXES 4 | |
1585 | ||
1586 | char *get_human_readable_size(char *buf, int buf_size, int64_t size) | |
1587 | { | |
1588 | static const char suffixes[NB_SUFFIXES] = "KMGT"; | |
1589 | int64_t base; | |
1590 | int i; | |
1591 | ||
1592 | if (size <= 999) { | |
1593 | snprintf(buf, buf_size, "%" PRId64, size); | |
1594 | } else { | |
1595 | base = 1024; | |
1596 | for(i = 0; i < NB_SUFFIXES; i++) { | |
1597 | if (size < (10 * base)) { | |
5fafdf24 | 1598 | snprintf(buf, buf_size, "%0.1f%c", |
faea38e7 FB |
1599 | (double)size / base, |
1600 | suffixes[i]); | |
1601 | break; | |
1602 | } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { | |
5fafdf24 | 1603 | snprintf(buf, buf_size, "%" PRId64 "%c", |
faea38e7 FB |
1604 | ((size + (base >> 1)) / base), |
1605 | suffixes[i]); | |
1606 | break; | |
1607 | } | |
1608 | base = base * 1024; | |
1609 | } | |
1610 | } | |
1611 | return buf; | |
1612 | } | |
1613 | ||
1614 | char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) | |
1615 | { | |
1616 | char buf1[128], date_buf[128], clock_buf[128]; | |
3b9f94e1 FB |
1617 | #ifdef _WIN32 |
1618 | struct tm *ptm; | |
1619 | #else | |
faea38e7 | 1620 | struct tm tm; |
3b9f94e1 | 1621 | #endif |
faea38e7 FB |
1622 | time_t ti; |
1623 | int64_t secs; | |
1624 | ||
1625 | if (!sn) { | |
5fafdf24 TS |
1626 | snprintf(buf, buf_size, |
1627 | "%-10s%-20s%7s%20s%15s", | |
faea38e7 FB |
1628 | "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
1629 | } else { | |
1630 | ti = sn->date_sec; | |
3b9f94e1 FB |
1631 | #ifdef _WIN32 |
1632 | ptm = localtime(&ti); | |
1633 | strftime(date_buf, sizeof(date_buf), | |
1634 | "%Y-%m-%d %H:%M:%S", ptm); | |
1635 | #else | |
faea38e7 FB |
1636 | localtime_r(&ti, &tm); |
1637 | strftime(date_buf, sizeof(date_buf), | |
1638 | "%Y-%m-%d %H:%M:%S", &tm); | |
3b9f94e1 | 1639 | #endif |
faea38e7 FB |
1640 | secs = sn->vm_clock_nsec / 1000000000; |
1641 | snprintf(clock_buf, sizeof(clock_buf), | |
1642 | "%02d:%02d:%02d.%03d", | |
1643 | (int)(secs / 3600), | |
1644 | (int)((secs / 60) % 60), | |
5fafdf24 | 1645 | (int)(secs % 60), |
faea38e7 FB |
1646 | (int)((sn->vm_clock_nsec / 1000000) % 1000)); |
1647 | snprintf(buf, buf_size, | |
5fafdf24 | 1648 | "%-10s%-20s%7s%20s%15s", |
faea38e7 FB |
1649 | sn->id_str, sn->name, |
1650 | get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), | |
1651 | date_buf, | |
1652 | clock_buf); | |
1653 | } | |
1654 | return buf; | |
1655 | } | |
1656 | ||
83f64091 | 1657 | |
ea2384d3 | 1658 | /**************************************************************/ |
83f64091 | 1659 | /* async I/Os */ |
ea2384d3 | 1660 | |
3b69e4b9 | 1661 | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
f141eafe | 1662 | QEMUIOVector *qiov, int nb_sectors, |
3b69e4b9 | 1663 | BlockDriverCompletionFunc *cb, void *opaque) |
83f64091 FB |
1664 | { |
1665 | BlockDriver *drv = bs->drv; | |
a36e69dd | 1666 | BlockDriverAIOCB *ret; |
83f64091 | 1667 | |
19cb3738 | 1668 | if (!drv) |
ce1a14dc | 1669 | return NULL; |
71d0770c AL |
1670 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
1671 | return NULL; | |
3b46e624 | 1672 | |
f141eafe AL |
1673 | ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors, |
1674 | cb, opaque); | |
a36e69dd TS |
1675 | |
1676 | if (ret) { | |
1677 | /* Update stats even though technically transfer has not happened. */ | |
6ea44308 | 1678 | bs->rd_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE; |
a36e69dd TS |
1679 | bs->rd_ops ++; |
1680 | } | |
1681 | ||
1682 | return ret; | |
ea2384d3 FB |
1683 | } |
1684 | ||
f141eafe AL |
1685 | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
1686 | QEMUIOVector *qiov, int nb_sectors, | |
1687 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 1688 | { |
83f64091 | 1689 | BlockDriver *drv = bs->drv; |
a36e69dd | 1690 | BlockDriverAIOCB *ret; |
ea2384d3 | 1691 | |
19cb3738 | 1692 | if (!drv) |
ce1a14dc | 1693 | return NULL; |
83f64091 | 1694 | if (bs->read_only) |
ce1a14dc | 1695 | return NULL; |
71d0770c AL |
1696 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
1697 | return NULL; | |
83f64091 | 1698 | |
c6d22830 | 1699 | if (bs->dirty_bitmap) { |
7cd1e32a | 1700 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
1701 | } | |
a55eb92c | 1702 | |
f141eafe AL |
1703 | ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors, |
1704 | cb, opaque); | |
a36e69dd TS |
1705 | |
1706 | if (ret) { | |
1707 | /* Update stats even though technically transfer has not happened. */ | |
6ea44308 | 1708 | bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE; |
a36e69dd TS |
1709 | bs->wr_ops ++; |
1710 | } | |
1711 | ||
1712 | return ret; | |
83f64091 FB |
1713 | } |
1714 | ||
40b4f539 KW |
1715 | |
1716 | typedef struct MultiwriteCB { | |
1717 | int error; | |
1718 | int num_requests; | |
1719 | int num_callbacks; | |
1720 | struct { | |
1721 | BlockDriverCompletionFunc *cb; | |
1722 | void *opaque; | |
1723 | QEMUIOVector *free_qiov; | |
1724 | void *free_buf; | |
1725 | } callbacks[]; | |
1726 | } MultiwriteCB; | |
1727 | ||
1728 | static void multiwrite_user_cb(MultiwriteCB *mcb) | |
1729 | { | |
1730 | int i; | |
1731 | ||
1732 | for (i = 0; i < mcb->num_callbacks; i++) { | |
1733 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); | |
1734 | qemu_free(mcb->callbacks[i].free_qiov); | |
f8a83245 | 1735 | qemu_vfree(mcb->callbacks[i].free_buf); |
40b4f539 KW |
1736 | } |
1737 | } | |
1738 | ||
1739 | static void multiwrite_cb(void *opaque, int ret) | |
1740 | { | |
1741 | MultiwriteCB *mcb = opaque; | |
1742 | ||
cb6d3ca0 | 1743 | if (ret < 0 && !mcb->error) { |
40b4f539 KW |
1744 | mcb->error = ret; |
1745 | multiwrite_user_cb(mcb); | |
1746 | } | |
1747 | ||
1748 | mcb->num_requests--; | |
1749 | if (mcb->num_requests == 0) { | |
1750 | if (mcb->error == 0) { | |
1751 | multiwrite_user_cb(mcb); | |
1752 | } | |
1753 | qemu_free(mcb); | |
1754 | } | |
1755 | } | |
1756 | ||
1757 | static int multiwrite_req_compare(const void *a, const void *b) | |
1758 | { | |
1759 | return (((BlockRequest*) a)->sector - ((BlockRequest*) b)->sector); | |
1760 | } | |
1761 | ||
1762 | /* | |
1763 | * Takes a bunch of requests and tries to merge them. Returns the number of | |
1764 | * requests that remain after merging. | |
1765 | */ | |
1766 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, | |
1767 | int num_reqs, MultiwriteCB *mcb) | |
1768 | { | |
1769 | int i, outidx; | |
1770 | ||
1771 | // Sort requests by start sector | |
1772 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); | |
1773 | ||
1774 | // Check if adjacent requests touch the same clusters. If so, combine them, | |
1775 | // filling up gaps with zero sectors. | |
1776 | outidx = 0; | |
1777 | for (i = 1; i < num_reqs; i++) { | |
1778 | int merge = 0; | |
1779 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; | |
1780 | ||
1781 | // This handles the cases that are valid for all block drivers, namely | |
1782 | // exactly sequential writes and overlapping writes. | |
1783 | if (reqs[i].sector <= oldreq_last) { | |
1784 | merge = 1; | |
1785 | } | |
1786 | ||
1787 | // The block driver may decide that it makes sense to combine requests | |
1788 | // even if there is a gap of some sectors between them. In this case, | |
1789 | // the gap is filled with zeros (therefore only applicable for yet | |
1790 | // unused space in format like qcow2). | |
1791 | if (!merge && bs->drv->bdrv_merge_requests) { | |
1792 | merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]); | |
1793 | } | |
1794 | ||
e2a305fb CH |
1795 | if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
1796 | merge = 0; | |
1797 | } | |
1798 | ||
40b4f539 KW |
1799 | if (merge) { |
1800 | size_t size; | |
1801 | QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov)); | |
1802 | qemu_iovec_init(qiov, | |
1803 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); | |
1804 | ||
1805 | // Add the first request to the merged one. If the requests are | |
1806 | // overlapping, drop the last sectors of the first request. | |
1807 | size = (reqs[i].sector - reqs[outidx].sector) << 9; | |
1808 | qemu_iovec_concat(qiov, reqs[outidx].qiov, size); | |
1809 | ||
1810 | // We might need to add some zeros between the two requests | |
1811 | if (reqs[i].sector > oldreq_last) { | |
1812 | size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9; | |
1813 | uint8_t *buf = qemu_blockalign(bs, zero_bytes); | |
1814 | memset(buf, 0, zero_bytes); | |
1815 | qemu_iovec_add(qiov, buf, zero_bytes); | |
1816 | mcb->callbacks[i].free_buf = buf; | |
1817 | } | |
1818 | ||
1819 | // Add the second request | |
1820 | qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size); | |
1821 | ||
1822 | reqs[outidx].nb_sectors += reqs[i].nb_sectors; | |
1823 | reqs[outidx].qiov = qiov; | |
1824 | ||
1825 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; | |
1826 | } else { | |
1827 | outidx++; | |
1828 | reqs[outidx].sector = reqs[i].sector; | |
1829 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; | |
1830 | reqs[outidx].qiov = reqs[i].qiov; | |
1831 | } | |
1832 | } | |
1833 | ||
1834 | return outidx + 1; | |
1835 | } | |
1836 | ||
1837 | /* | |
1838 | * Submit multiple AIO write requests at once. | |
1839 | * | |
1840 | * On success, the function returns 0 and all requests in the reqs array have | |
1841 | * been submitted. In error case this function returns -1, and any of the | |
1842 | * requests may or may not be submitted yet. In particular, this means that the | |
1843 | * callback will be called for some of the requests, for others it won't. The | |
1844 | * caller must check the error field of the BlockRequest to wait for the right | |
1845 | * callbacks (if error != 0, no callback will be called). | |
1846 | * | |
1847 | * The implementation may modify the contents of the reqs array, e.g. to merge | |
1848 | * requests. However, the fields opaque and error are left unmodified as they | |
1849 | * are used to signal failure for a single request to the caller. | |
1850 | */ | |
1851 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) | |
1852 | { | |
1853 | BlockDriverAIOCB *acb; | |
1854 | MultiwriteCB *mcb; | |
1855 | int i; | |
1856 | ||
1857 | if (num_reqs == 0) { | |
1858 | return 0; | |
1859 | } | |
1860 | ||
1861 | // Create MultiwriteCB structure | |
1862 | mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); | |
1863 | mcb->num_requests = 0; | |
1864 | mcb->num_callbacks = num_reqs; | |
1865 | ||
1866 | for (i = 0; i < num_reqs; i++) { | |
1867 | mcb->callbacks[i].cb = reqs[i].cb; | |
1868 | mcb->callbacks[i].opaque = reqs[i].opaque; | |
1869 | } | |
1870 | ||
1871 | // Check for mergable requests | |
1872 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); | |
1873 | ||
1874 | // Run the aio requests | |
1875 | for (i = 0; i < num_reqs; i++) { | |
1876 | acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, | |
1877 | reqs[i].nb_sectors, multiwrite_cb, mcb); | |
1878 | ||
1879 | if (acb == NULL) { | |
1880 | // We can only fail the whole thing if no request has been | |
1881 | // submitted yet. Otherwise we'll wait for the submitted AIOs to | |
1882 | // complete and report the error in the callback. | |
1883 | if (mcb->num_requests == 0) { | |
0f0b604b | 1884 | reqs[i].error = -EIO; |
40b4f539 KW |
1885 | goto fail; |
1886 | } else { | |
7eb58a6c KW |
1887 | mcb->num_requests++; |
1888 | multiwrite_cb(mcb, -EIO); | |
40b4f539 KW |
1889 | break; |
1890 | } | |
1891 | } else { | |
1892 | mcb->num_requests++; | |
1893 | } | |
1894 | } | |
1895 | ||
1896 | return 0; | |
1897 | ||
1898 | fail: | |
1899 | free(mcb); | |
1900 | return -1; | |
1901 | } | |
1902 | ||
b2e12bc6 CH |
1903 | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
1904 | BlockDriverCompletionFunc *cb, void *opaque) | |
1905 | { | |
1906 | BlockDriver *drv = bs->drv; | |
1907 | ||
1908 | if (!drv) | |
1909 | return NULL; | |
b2e12bc6 CH |
1910 | return drv->bdrv_aio_flush(bs, cb, opaque); |
1911 | } | |
1912 | ||
83f64091 | 1913 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
83f64091 | 1914 | { |
6bbff9a0 | 1915 | acb->pool->cancel(acb); |
83f64091 FB |
1916 | } |
1917 | ||
ce1a14dc | 1918 | |
83f64091 FB |
1919 | /**************************************************************/ |
1920 | /* async block device emulation */ | |
1921 | ||
c16b5a2c CH |
1922 | typedef struct BlockDriverAIOCBSync { |
1923 | BlockDriverAIOCB common; | |
1924 | QEMUBH *bh; | |
1925 | int ret; | |
1926 | /* vector translation state */ | |
1927 | QEMUIOVector *qiov; | |
1928 | uint8_t *bounce; | |
1929 | int is_write; | |
1930 | } BlockDriverAIOCBSync; | |
1931 | ||
1932 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) | |
1933 | { | |
1934 | BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb; | |
6a7ad299 | 1935 | qemu_bh_delete(acb->bh); |
36afc451 | 1936 | acb->bh = NULL; |
c16b5a2c CH |
1937 | qemu_aio_release(acb); |
1938 | } | |
1939 | ||
1940 | static AIOPool bdrv_em_aio_pool = { | |
1941 | .aiocb_size = sizeof(BlockDriverAIOCBSync), | |
1942 | .cancel = bdrv_aio_cancel_em, | |
1943 | }; | |
1944 | ||
ce1a14dc | 1945 | static void bdrv_aio_bh_cb(void *opaque) |
83f64091 | 1946 | { |
ce1a14dc | 1947 | BlockDriverAIOCBSync *acb = opaque; |
f141eafe | 1948 | |
f141eafe AL |
1949 | if (!acb->is_write) |
1950 | qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); | |
ceb42de8 | 1951 | qemu_vfree(acb->bounce); |
ce1a14dc | 1952 | acb->common.cb(acb->common.opaque, acb->ret); |
6a7ad299 | 1953 | qemu_bh_delete(acb->bh); |
36afc451 | 1954 | acb->bh = NULL; |
ce1a14dc | 1955 | qemu_aio_release(acb); |
83f64091 | 1956 | } |
beac80cd | 1957 | |
f141eafe AL |
1958 | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
1959 | int64_t sector_num, | |
1960 | QEMUIOVector *qiov, | |
1961 | int nb_sectors, | |
1962 | BlockDriverCompletionFunc *cb, | |
1963 | void *opaque, | |
1964 | int is_write) | |
1965 | ||
83f64091 | 1966 | { |
ce1a14dc | 1967 | BlockDriverAIOCBSync *acb; |
ce1a14dc | 1968 | |
c16b5a2c | 1969 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
f141eafe AL |
1970 | acb->is_write = is_write; |
1971 | acb->qiov = qiov; | |
e268ca52 | 1972 | acb->bounce = qemu_blockalign(bs, qiov->size); |
f141eafe | 1973 | |
ce1a14dc PB |
1974 | if (!acb->bh) |
1975 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
f141eafe AL |
1976 | |
1977 | if (is_write) { | |
1978 | qemu_iovec_to_buffer(acb->qiov, acb->bounce); | |
1979 | acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors); | |
1980 | } else { | |
1981 | acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors); | |
1982 | } | |
1983 | ||
ce1a14dc | 1984 | qemu_bh_schedule(acb->bh); |
f141eafe | 1985 | |
ce1a14dc | 1986 | return &acb->common; |
beac80cd FB |
1987 | } |
1988 | ||
f141eafe AL |
1989 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
1990 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 1991 | BlockDriverCompletionFunc *cb, void *opaque) |
beac80cd | 1992 | { |
f141eafe AL |
1993 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
1994 | } | |
83f64091 | 1995 | |
f141eafe AL |
1996 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
1997 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
1998 | BlockDriverCompletionFunc *cb, void *opaque) | |
1999 | { | |
2000 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); | |
beac80cd | 2001 | } |
beac80cd | 2002 | |
b2e12bc6 CH |
2003 | static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, |
2004 | BlockDriverCompletionFunc *cb, void *opaque) | |
2005 | { | |
2006 | BlockDriverAIOCBSync *acb; | |
2007 | ||
2008 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); | |
2009 | acb->is_write = 1; /* don't bounce in the completion hadler */ | |
2010 | acb->qiov = NULL; | |
2011 | acb->bounce = NULL; | |
2012 | acb->ret = 0; | |
2013 | ||
2014 | if (!acb->bh) | |
2015 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
2016 | ||
2017 | bdrv_flush(bs); | |
2018 | qemu_bh_schedule(acb->bh); | |
2019 | return &acb->common; | |
2020 | } | |
2021 | ||
83f64091 FB |
2022 | /**************************************************************/ |
2023 | /* sync block device emulation */ | |
ea2384d3 | 2024 | |
83f64091 FB |
2025 | static void bdrv_rw_em_cb(void *opaque, int ret) |
2026 | { | |
2027 | *(int *)opaque = ret; | |
ea2384d3 FB |
2028 | } |
2029 | ||
83f64091 FB |
2030 | #define NOT_DONE 0x7fffffff |
2031 | ||
5fafdf24 | 2032 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
83f64091 | 2033 | uint8_t *buf, int nb_sectors) |
7a6cba61 | 2034 | { |
ce1a14dc PB |
2035 | int async_ret; |
2036 | BlockDriverAIOCB *acb; | |
f141eafe AL |
2037 | struct iovec iov; |
2038 | QEMUIOVector qiov; | |
83f64091 | 2039 | |
65d6b3d8 KW |
2040 | async_context_push(); |
2041 | ||
83f64091 | 2042 | async_ret = NOT_DONE; |
3f4cb3d3 | 2043 | iov.iov_base = (void *)buf; |
f141eafe AL |
2044 | iov.iov_len = nb_sectors * 512; |
2045 | qemu_iovec_init_external(&qiov, &iov, 1); | |
2046 | acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors, | |
2047 | bdrv_rw_em_cb, &async_ret); | |
65d6b3d8 KW |
2048 | if (acb == NULL) { |
2049 | async_ret = -1; | |
2050 | goto fail; | |
2051 | } | |
baf35cb9 | 2052 | |
83f64091 FB |
2053 | while (async_ret == NOT_DONE) { |
2054 | qemu_aio_wait(); | |
2055 | } | |
baf35cb9 | 2056 | |
65d6b3d8 KW |
2057 | |
2058 | fail: | |
2059 | async_context_pop(); | |
83f64091 | 2060 | return async_ret; |
7a6cba61 PB |
2061 | } |
2062 | ||
83f64091 FB |
2063 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
2064 | const uint8_t *buf, int nb_sectors) | |
2065 | { | |
ce1a14dc PB |
2066 | int async_ret; |
2067 | BlockDriverAIOCB *acb; | |
f141eafe AL |
2068 | struct iovec iov; |
2069 | QEMUIOVector qiov; | |
83f64091 | 2070 | |
65d6b3d8 KW |
2071 | async_context_push(); |
2072 | ||
83f64091 | 2073 | async_ret = NOT_DONE; |
f141eafe AL |
2074 | iov.iov_base = (void *)buf; |
2075 | iov.iov_len = nb_sectors * 512; | |
2076 | qemu_iovec_init_external(&qiov, &iov, 1); | |
2077 | acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors, | |
2078 | bdrv_rw_em_cb, &async_ret); | |
65d6b3d8 KW |
2079 | if (acb == NULL) { |
2080 | async_ret = -1; | |
2081 | goto fail; | |
2082 | } | |
83f64091 FB |
2083 | while (async_ret == NOT_DONE) { |
2084 | qemu_aio_wait(); | |
2085 | } | |
65d6b3d8 KW |
2086 | |
2087 | fail: | |
2088 | async_context_pop(); | |
83f64091 FB |
2089 | return async_ret; |
2090 | } | |
ea2384d3 FB |
2091 | |
2092 | void bdrv_init(void) | |
2093 | { | |
5efa9d5a | 2094 | module_call_init(MODULE_INIT_BLOCK); |
ea2384d3 | 2095 | } |
ce1a14dc | 2096 | |
eb852011 MA |
2097 | void bdrv_init_with_whitelist(void) |
2098 | { | |
2099 | use_bdrv_whitelist = 1; | |
2100 | bdrv_init(); | |
2101 | } | |
2102 | ||
c16b5a2c CH |
2103 | void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs, |
2104 | BlockDriverCompletionFunc *cb, void *opaque) | |
ce1a14dc | 2105 | { |
ce1a14dc PB |
2106 | BlockDriverAIOCB *acb; |
2107 | ||
6bbff9a0 AL |
2108 | if (pool->free_aiocb) { |
2109 | acb = pool->free_aiocb; | |
2110 | pool->free_aiocb = acb->next; | |
ce1a14dc | 2111 | } else { |
6bbff9a0 AL |
2112 | acb = qemu_mallocz(pool->aiocb_size); |
2113 | acb->pool = pool; | |
ce1a14dc PB |
2114 | } |
2115 | acb->bs = bs; | |
2116 | acb->cb = cb; | |
2117 | acb->opaque = opaque; | |
2118 | return acb; | |
2119 | } | |
2120 | ||
2121 | void qemu_aio_release(void *p) | |
2122 | { | |
6bbff9a0 AL |
2123 | BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; |
2124 | AIOPool *pool = acb->pool; | |
2125 | acb->next = pool->free_aiocb; | |
2126 | pool->free_aiocb = acb; | |
ce1a14dc | 2127 | } |
19cb3738 FB |
2128 | |
2129 | /**************************************************************/ | |
2130 | /* removable device support */ | |
2131 | ||
2132 | /** | |
2133 | * Return TRUE if the media is present | |
2134 | */ | |
2135 | int bdrv_is_inserted(BlockDriverState *bs) | |
2136 | { | |
2137 | BlockDriver *drv = bs->drv; | |
2138 | int ret; | |
2139 | if (!drv) | |
2140 | return 0; | |
2141 | if (!drv->bdrv_is_inserted) | |
2142 | return 1; | |
2143 | ret = drv->bdrv_is_inserted(bs); | |
2144 | return ret; | |
2145 | } | |
2146 | ||
2147 | /** | |
2148 | * Return TRUE if the media changed since the last call to this | |
5fafdf24 | 2149 | * function. It is currently only used for floppy disks |
19cb3738 FB |
2150 | */ |
2151 | int bdrv_media_changed(BlockDriverState *bs) | |
2152 | { | |
2153 | BlockDriver *drv = bs->drv; | |
2154 | int ret; | |
2155 | ||
2156 | if (!drv || !drv->bdrv_media_changed) | |
2157 | ret = -ENOTSUP; | |
2158 | else | |
2159 | ret = drv->bdrv_media_changed(bs); | |
2160 | if (ret == -ENOTSUP) | |
2161 | ret = bs->media_changed; | |
2162 | bs->media_changed = 0; | |
2163 | return ret; | |
2164 | } | |
2165 | ||
2166 | /** | |
2167 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
2168 | */ | |
aea2a33c | 2169 | int bdrv_eject(BlockDriverState *bs, int eject_flag) |
19cb3738 FB |
2170 | { |
2171 | BlockDriver *drv = bs->drv; | |
2172 | int ret; | |
2173 | ||
aea2a33c MM |
2174 | if (bs->locked) { |
2175 | return -EBUSY; | |
2176 | } | |
2177 | ||
19cb3738 FB |
2178 | if (!drv || !drv->bdrv_eject) { |
2179 | ret = -ENOTSUP; | |
2180 | } else { | |
2181 | ret = drv->bdrv_eject(bs, eject_flag); | |
2182 | } | |
2183 | if (ret == -ENOTSUP) { | |
2184 | if (eject_flag) | |
2185 | bdrv_close(bs); | |
aea2a33c | 2186 | ret = 0; |
19cb3738 | 2187 | } |
aea2a33c MM |
2188 | |
2189 | return ret; | |
19cb3738 FB |
2190 | } |
2191 | ||
2192 | int bdrv_is_locked(BlockDriverState *bs) | |
2193 | { | |
2194 | return bs->locked; | |
2195 | } | |
2196 | ||
2197 | /** | |
2198 | * Lock or unlock the media (if it is locked, the user won't be able | |
2199 | * to eject it manually). | |
2200 | */ | |
2201 | void bdrv_set_locked(BlockDriverState *bs, int locked) | |
2202 | { | |
2203 | BlockDriver *drv = bs->drv; | |
2204 | ||
2205 | bs->locked = locked; | |
2206 | if (drv && drv->bdrv_set_locked) { | |
2207 | drv->bdrv_set_locked(bs, locked); | |
2208 | } | |
2209 | } | |
985a03b0 TS |
2210 | |
2211 | /* needed for generic scsi interface */ | |
2212 | ||
2213 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
2214 | { | |
2215 | BlockDriver *drv = bs->drv; | |
2216 | ||
2217 | if (drv && drv->bdrv_ioctl) | |
2218 | return drv->bdrv_ioctl(bs, req, buf); | |
2219 | return -ENOTSUP; | |
2220 | } | |
7d780669 | 2221 | |
221f715d AL |
2222 | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
2223 | unsigned long int req, void *buf, | |
2224 | BlockDriverCompletionFunc *cb, void *opaque) | |
7d780669 | 2225 | { |
221f715d | 2226 | BlockDriver *drv = bs->drv; |
7d780669 | 2227 | |
221f715d AL |
2228 | if (drv && drv->bdrv_aio_ioctl) |
2229 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); | |
2230 | return NULL; | |
7d780669 | 2231 | } |
e268ca52 | 2232 | |
7cd1e32a | 2233 | |
2234 | ||
e268ca52 AL |
2235 | void *qemu_blockalign(BlockDriverState *bs, size_t size) |
2236 | { | |
2237 | return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); | |
2238 | } | |
7cd1e32a | 2239 | |
2240 | void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable) | |
2241 | { | |
2242 | int64_t bitmap_size; | |
a55eb92c | 2243 | |
aaa0eb75 | 2244 | bs->dirty_count = 0; |
a55eb92c | 2245 | if (enable) { |
c6d22830 JK |
2246 | if (!bs->dirty_bitmap) { |
2247 | bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) + | |
2248 | BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1; | |
2249 | bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8; | |
a55eb92c | 2250 | |
7cd1e32a | 2251 | bs->dirty_bitmap = qemu_mallocz(bitmap_size); |
a55eb92c | 2252 | } |
7cd1e32a | 2253 | } else { |
c6d22830 | 2254 | if (bs->dirty_bitmap) { |
7cd1e32a | 2255 | qemu_free(bs->dirty_bitmap); |
c6d22830 | 2256 | bs->dirty_bitmap = NULL; |
a55eb92c | 2257 | } |
7cd1e32a | 2258 | } |
2259 | } | |
2260 | ||
2261 | int bdrv_get_dirty(BlockDriverState *bs, int64_t sector) | |
2262 | { | |
6ea44308 | 2263 | int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; |
a55eb92c | 2264 | |
c6d22830 JK |
2265 | if (bs->dirty_bitmap && |
2266 | (sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) { | |
2267 | return bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] & | |
2268 | (1 << (chunk % (sizeof(unsigned long) * 8))); | |
7cd1e32a | 2269 | } else { |
2270 | return 0; | |
2271 | } | |
2272 | } | |
2273 | ||
a55eb92c JK |
2274 | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, |
2275 | int nr_sectors) | |
7cd1e32a | 2276 | { |
2277 | set_dirty_bitmap(bs, cur_sector, nr_sectors, 0); | |
2278 | } | |
aaa0eb75 LS |
2279 | |
2280 | int64_t bdrv_get_dirty_count(BlockDriverState *bs) | |
2281 | { | |
2282 | return bs->dirty_count; | |
2283 | } |