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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" |
4305793b | 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 | |
83f64091 FB |
313 | ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY); |
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 | { | |
59f2689d | 359 | int ret, open_flags, try_rw; |
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; |
e268ca52 AL |
366 | /* buffer_alignment defaulted to 512, drivers can change this value */ |
367 | bs->buffer_alignment = 512; | |
712e7874 | 368 | |
83f64091 | 369 | if (flags & BDRV_O_SNAPSHOT) { |
ea2384d3 FB |
370 | BlockDriverState *bs1; |
371 | int64_t total_size; | |
7c96d46e | 372 | int is_protocol = 0; |
91a073a9 KW |
373 | BlockDriver *bdrv_qcow2; |
374 | QEMUOptionParameter *options; | |
3b46e624 | 375 | |
ea2384d3 FB |
376 | /* if snapshot, we create a temporary backing file and open it |
377 | instead of opening 'filename' directly */ | |
33e3963e | 378 | |
ea2384d3 FB |
379 | /* if there is a backing file, use it */ |
380 | bs1 = bdrv_new(""); | |
5eb45639 | 381 | ret = bdrv_open2(bs1, filename, 0, drv); |
51d7c00c | 382 | if (ret < 0) { |
ea2384d3 | 383 | bdrv_delete(bs1); |
51d7c00c | 384 | return ret; |
ea2384d3 | 385 | } |
6ea44308 | 386 | total_size = bdrv_getlength(bs1) >> BDRV_SECTOR_BITS; |
7c96d46e AL |
387 | |
388 | if (bs1->drv && bs1->drv->protocol_name) | |
389 | is_protocol = 1; | |
390 | ||
ea2384d3 | 391 | bdrv_delete(bs1); |
3b46e624 | 392 | |
ea2384d3 | 393 | get_tmp_filename(tmp_filename, sizeof(tmp_filename)); |
7c96d46e AL |
394 | |
395 | /* Real path is meaningless for protocols */ | |
396 | if (is_protocol) | |
397 | snprintf(backing_filename, sizeof(backing_filename), | |
398 | "%s", filename); | |
399 | else | |
400 | realpath(filename, backing_filename); | |
401 | ||
91a073a9 KW |
402 | bdrv_qcow2 = bdrv_find_format("qcow2"); |
403 | options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); | |
404 | ||
405 | set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size * 512); | |
406 | set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); | |
407 | if (drv) { | |
408 | set_option_parameter(options, BLOCK_OPT_BACKING_FMT, | |
409 | drv->format_name); | |
410 | } | |
411 | ||
412 | ret = bdrv_create(bdrv_qcow2, tmp_filename, options); | |
51d7c00c AL |
413 | if (ret < 0) { |
414 | return ret; | |
ea2384d3 | 415 | } |
91a073a9 | 416 | |
ea2384d3 | 417 | filename = tmp_filename; |
91a073a9 | 418 | drv = bdrv_qcow2; |
ea2384d3 FB |
419 | bs->is_temporary = 1; |
420 | } | |
712e7874 | 421 | |
ea2384d3 | 422 | pstrcpy(bs->filename, sizeof(bs->filename), filename); |
83f64091 FB |
423 | if (flags & BDRV_O_FILE) { |
424 | drv = find_protocol(filename); | |
51d7c00c | 425 | } else if (!drv) { |
f3a5d3f8 CH |
426 | drv = find_hdev_driver(filename); |
427 | if (!drv) { | |
428 | drv = find_image_format(filename); | |
429 | } | |
51d7c00c AL |
430 | } |
431 | if (!drv) { | |
432 | ret = -ENOENT; | |
433 | goto unlink_and_fail; | |
ea2384d3 FB |
434 | } |
435 | bs->drv = drv; | |
436 | bs->opaque = qemu_mallocz(drv->instance_size); | |
e900a7b7 CH |
437 | |
438 | /* | |
439 | * Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a | |
440 | * write cache to the guest. We do need the fdatasync to flush | |
441 | * out transactions for block allocations, and we maybe have a | |
442 | * volatile write cache in our backing device to deal with. | |
443 | */ | |
444 | if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE)) | |
445 | bs->enable_write_cache = 1; | |
446 | ||
83f64091 FB |
447 | /* Note: for compatibility, we open disk image files as RDWR, and |
448 | RDONLY as fallback */ | |
59f2689d | 449 | try_rw = !bs->read_only || bs->is_temporary; |
83f64091 | 450 | if (!(flags & BDRV_O_FILE)) |
59f2689d NS |
451 | open_flags = (try_rw ? BDRV_O_RDWR : 0) | |
452 | (flags & (BDRV_O_CACHE_MASK|BDRV_O_NATIVE_AIO)); | |
83f64091 FB |
453 | else |
454 | open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT); | |
eb852011 MA |
455 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) |
456 | ret = -ENOTSUP; | |
457 | else | |
458 | ret = drv->bdrv_open(bs, filename, open_flags); | |
a0a83536 | 459 | if ((ret == -EACCES || ret == -EPERM) && !(flags & BDRV_O_FILE)) { |
1cec71e3 | 460 | ret = drv->bdrv_open(bs, filename, open_flags & ~BDRV_O_RDWR); |
83f64091 FB |
461 | bs->read_only = 1; |
462 | } | |
ea2384d3 FB |
463 | if (ret < 0) { |
464 | qemu_free(bs->opaque); | |
6b21b973 FB |
465 | bs->opaque = NULL; |
466 | bs->drv = NULL; | |
51d7c00c AL |
467 | unlink_and_fail: |
468 | if (bs->is_temporary) | |
469 | unlink(filename); | |
83f64091 | 470 | return ret; |
33e3963e | 471 | } |
d15a771d | 472 | if (drv->bdrv_getlength) { |
6ea44308 | 473 | bs->total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
d15a771d | 474 | } |
67b915a5 | 475 | #ifndef _WIN32 |
ea2384d3 FB |
476 | if (bs->is_temporary) { |
477 | unlink(filename); | |
478 | } | |
479 | #endif | |
83f64091 | 480 | if (bs->backing_file[0] != '\0') { |
ea2384d3 | 481 | /* if there is a backing file, use it */ |
5eb45639 | 482 | BlockDriver *back_drv = NULL; |
ea2384d3 | 483 | bs->backing_hd = bdrv_new(""); |
59f2689d NS |
484 | /* pass on read_only property to the backing_hd */ |
485 | bs->backing_hd->read_only = bs->read_only; | |
83f64091 FB |
486 | path_combine(backing_filename, sizeof(backing_filename), |
487 | filename, bs->backing_file); | |
5eb45639 AL |
488 | if (bs->backing_format[0] != '\0') |
489 | back_drv = bdrv_find_format(bs->backing_format); | |
490 | ret = bdrv_open2(bs->backing_hd, backing_filename, open_flags, | |
491 | back_drv); | |
51d7c00c AL |
492 | if (ret < 0) { |
493 | bdrv_close(bs); | |
494 | return ret; | |
495 | } | |
33e3963e FB |
496 | } |
497 | ||
bb5fc20f AL |
498 | if (!bdrv_key_required(bs)) { |
499 | /* call the change callback */ | |
500 | bs->media_changed = 1; | |
501 | if (bs->change_cb) | |
502 | bs->change_cb(bs->change_opaque); | |
503 | } | |
b338082b | 504 | return 0; |
fc01f7e7 FB |
505 | } |
506 | ||
507 | void bdrv_close(BlockDriverState *bs) | |
508 | { | |
19cb3738 | 509 | if (bs->drv) { |
ea2384d3 FB |
510 | if (bs->backing_hd) |
511 | bdrv_delete(bs->backing_hd); | |
512 | bs->drv->bdrv_close(bs); | |
513 | qemu_free(bs->opaque); | |
514 | #ifdef _WIN32 | |
515 | if (bs->is_temporary) { | |
516 | unlink(bs->filename); | |
517 | } | |
67b915a5 | 518 | #endif |
ea2384d3 FB |
519 | bs->opaque = NULL; |
520 | bs->drv = NULL; | |
b338082b FB |
521 | |
522 | /* call the change callback */ | |
19cb3738 | 523 | bs->media_changed = 1; |
b338082b FB |
524 | if (bs->change_cb) |
525 | bs->change_cb(bs->change_opaque); | |
526 | } | |
527 | } | |
528 | ||
529 | void bdrv_delete(BlockDriverState *bs) | |
530 | { | |
34c6f050 AJ |
531 | BlockDriverState **pbs; |
532 | ||
533 | pbs = &bdrv_first; | |
534 | while (*pbs != bs && *pbs != NULL) | |
535 | pbs = &(*pbs)->next; | |
536 | if (*pbs == bs) | |
537 | *pbs = bs->next; | |
538 | ||
b338082b FB |
539 | bdrv_close(bs); |
540 | qemu_free(bs); | |
fc01f7e7 FB |
541 | } |
542 | ||
e97fc193 AL |
543 | /* |
544 | * Run consistency checks on an image | |
545 | * | |
546 | * Returns the number of errors or -errno when an internal error occurs | |
547 | */ | |
548 | int bdrv_check(BlockDriverState *bs) | |
549 | { | |
550 | if (bs->drv->bdrv_check == NULL) { | |
551 | return -ENOTSUP; | |
552 | } | |
553 | ||
554 | return bs->drv->bdrv_check(bs); | |
555 | } | |
556 | ||
33e3963e FB |
557 | /* commit COW file into the raw image */ |
558 | int bdrv_commit(BlockDriverState *bs) | |
559 | { | |
19cb3738 | 560 | BlockDriver *drv = bs->drv; |
83f64091 | 561 | int64_t i, total_sectors; |
ea2384d3 FB |
562 | int n, j; |
563 | unsigned char sector[512]; | |
33e3963e | 564 | |
19cb3738 FB |
565 | if (!drv) |
566 | return -ENOMEDIUM; | |
33e3963e FB |
567 | |
568 | if (bs->read_only) { | |
ea2384d3 | 569 | return -EACCES; |
33e3963e FB |
570 | } |
571 | ||
ea2384d3 FB |
572 | if (!bs->backing_hd) { |
573 | return -ENOTSUP; | |
574 | } | |
33e3963e | 575 | |
6ea44308 | 576 | total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
83f64091 | 577 | for (i = 0; i < total_sectors;) { |
19cb3738 | 578 | if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { |
ea2384d3 FB |
579 | for(j = 0; j < n; j++) { |
580 | if (bdrv_read(bs, i, sector, 1) != 0) { | |
581 | return -EIO; | |
582 | } | |
583 | ||
584 | if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { | |
585 | return -EIO; | |
586 | } | |
587 | i++; | |
33e3963e | 588 | } |
ea2384d3 FB |
589 | } else { |
590 | i += n; | |
591 | } | |
33e3963e | 592 | } |
95389c86 | 593 | |
19cb3738 FB |
594 | if (drv->bdrv_make_empty) |
595 | return drv->bdrv_make_empty(bs); | |
95389c86 | 596 | |
33e3963e FB |
597 | return 0; |
598 | } | |
599 | ||
71d0770c AL |
600 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
601 | size_t size) | |
602 | { | |
603 | int64_t len; | |
604 | ||
605 | if (!bdrv_is_inserted(bs)) | |
606 | return -ENOMEDIUM; | |
607 | ||
608 | if (bs->growable) | |
609 | return 0; | |
610 | ||
611 | len = bdrv_getlength(bs); | |
612 | ||
fbb7b4e0 KW |
613 | if (offset < 0) |
614 | return -EIO; | |
615 | ||
616 | if ((offset > len) || (len - offset < size)) | |
71d0770c AL |
617 | return -EIO; |
618 | ||
619 | return 0; | |
620 | } | |
621 | ||
622 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, | |
623 | int nb_sectors) | |
624 | { | |
999dec57 | 625 | return bdrv_check_byte_request(bs, sector_num * 512, nb_sectors * 512); |
71d0770c AL |
626 | } |
627 | ||
19cb3738 | 628 | /* return < 0 if error. See bdrv_write() for the return codes */ |
5fafdf24 | 629 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
630 | uint8_t *buf, int nb_sectors) |
631 | { | |
ea2384d3 FB |
632 | BlockDriver *drv = bs->drv; |
633 | ||
19cb3738 FB |
634 | if (!drv) |
635 | return -ENOMEDIUM; | |
71d0770c AL |
636 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
637 | return -EIO; | |
b338082b | 638 | |
eda578e5 | 639 | return drv->bdrv_read(bs, sector_num, buf, nb_sectors); |
fc01f7e7 FB |
640 | } |
641 | ||
7cd1e32a | 642 | static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num, |
a55eb92c | 643 | int nb_sectors, int dirty) |
7cd1e32a | 644 | { |
645 | int64_t start, end; | |
c6d22830 | 646 | unsigned long val, idx, bit; |
a55eb92c | 647 | |
6ea44308 | 648 | start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; |
c6d22830 | 649 | end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK; |
a55eb92c JK |
650 | |
651 | for (; start <= end; start++) { | |
c6d22830 JK |
652 | idx = start / (sizeof(unsigned long) * 8); |
653 | bit = start % (sizeof(unsigned long) * 8); | |
654 | val = bs->dirty_bitmap[idx]; | |
655 | if (dirty) { | |
656 | val |= 1 << bit; | |
657 | } else { | |
658 | val &= ~(1 << bit); | |
659 | } | |
660 | bs->dirty_bitmap[idx] = val; | |
7cd1e32a | 661 | } |
662 | } | |
663 | ||
5fafdf24 | 664 | /* Return < 0 if error. Important errors are: |
19cb3738 FB |
665 | -EIO generic I/O error (may happen for all errors) |
666 | -ENOMEDIUM No media inserted. | |
667 | -EINVAL Invalid sector number or nb_sectors | |
668 | -EACCES Trying to write a read-only device | |
669 | */ | |
5fafdf24 | 670 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
671 | const uint8_t *buf, int nb_sectors) |
672 | { | |
83f64091 | 673 | BlockDriver *drv = bs->drv; |
19cb3738 FB |
674 | if (!bs->drv) |
675 | return -ENOMEDIUM; | |
0849bf08 | 676 | if (bs->read_only) |
19cb3738 | 677 | return -EACCES; |
71d0770c AL |
678 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
679 | return -EIO; | |
a55eb92c | 680 | |
c6d22830 | 681 | if (bs->dirty_bitmap) { |
7cd1e32a | 682 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
683 | } | |
a55eb92c | 684 | |
42fb2807 | 685 | return drv->bdrv_write(bs, sector_num, buf, nb_sectors); |
83f64091 FB |
686 | } |
687 | ||
eda578e5 AL |
688 | int bdrv_pread(BlockDriverState *bs, int64_t offset, |
689 | void *buf, int count1) | |
83f64091 | 690 | { |
6ea44308 | 691 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
692 | int len, nb_sectors, count; |
693 | int64_t sector_num; | |
dbf45b44 | 694 | int ret; |
83f64091 FB |
695 | |
696 | count = count1; | |
697 | /* first read to align to sector start */ | |
6ea44308 | 698 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
699 | if (len > count) |
700 | len = count; | |
6ea44308 | 701 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 702 | if (len > 0) { |
dbf45b44 KW |
703 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
704 | return ret; | |
6ea44308 | 705 | memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len); |
83f64091 FB |
706 | count -= len; |
707 | if (count == 0) | |
708 | return count1; | |
709 | sector_num++; | |
710 | buf += len; | |
711 | } | |
712 | ||
713 | /* read the sectors "in place" */ | |
6ea44308 | 714 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 715 | if (nb_sectors > 0) { |
dbf45b44 KW |
716 | if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0) |
717 | return ret; | |
83f64091 | 718 | sector_num += nb_sectors; |
6ea44308 | 719 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
720 | buf += len; |
721 | count -= len; | |
722 | } | |
723 | ||
724 | /* add data from the last sector */ | |
725 | if (count > 0) { | |
dbf45b44 KW |
726 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
727 | return ret; | |
83f64091 FB |
728 | memcpy(buf, tmp_buf, count); |
729 | } | |
730 | return count1; | |
731 | } | |
732 | ||
eda578e5 AL |
733 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, |
734 | const void *buf, int count1) | |
83f64091 | 735 | { |
6ea44308 | 736 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
737 | int len, nb_sectors, count; |
738 | int64_t sector_num; | |
dbf45b44 | 739 | int ret; |
83f64091 FB |
740 | |
741 | count = count1; | |
742 | /* first write to align to sector start */ | |
6ea44308 | 743 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
744 | if (len > count) |
745 | len = count; | |
6ea44308 | 746 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 747 | if (len > 0) { |
dbf45b44 KW |
748 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
749 | return ret; | |
6ea44308 | 750 | memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len); |
dbf45b44 KW |
751 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
752 | return ret; | |
83f64091 FB |
753 | count -= len; |
754 | if (count == 0) | |
755 | return count1; | |
756 | sector_num++; | |
757 | buf += len; | |
758 | } | |
759 | ||
760 | /* write the sectors "in place" */ | |
6ea44308 | 761 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 762 | if (nb_sectors > 0) { |
dbf45b44 KW |
763 | if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0) |
764 | return ret; | |
83f64091 | 765 | sector_num += nb_sectors; |
6ea44308 | 766 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
767 | buf += len; |
768 | count -= len; | |
769 | } | |
770 | ||
771 | /* add data from the last sector */ | |
772 | if (count > 0) { | |
dbf45b44 KW |
773 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
774 | return ret; | |
83f64091 | 775 | memcpy(tmp_buf, buf, count); |
dbf45b44 KW |
776 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
777 | return ret; | |
83f64091 FB |
778 | } |
779 | return count1; | |
780 | } | |
83f64091 | 781 | |
83f64091 FB |
782 | /** |
783 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
784 | */ | |
785 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
786 | { | |
787 | BlockDriver *drv = bs->drv; | |
788 | if (!drv) | |
19cb3738 | 789 | return -ENOMEDIUM; |
83f64091 FB |
790 | if (!drv->bdrv_truncate) |
791 | return -ENOTSUP; | |
59f2689d NS |
792 | if (bs->read_only) |
793 | return -EACCES; | |
83f64091 FB |
794 | return drv->bdrv_truncate(bs, offset); |
795 | } | |
796 | ||
797 | /** | |
798 | * Length of a file in bytes. Return < 0 if error or unknown. | |
799 | */ | |
800 | int64_t bdrv_getlength(BlockDriverState *bs) | |
801 | { | |
802 | BlockDriver *drv = bs->drv; | |
803 | if (!drv) | |
19cb3738 | 804 | return -ENOMEDIUM; |
83f64091 FB |
805 | if (!drv->bdrv_getlength) { |
806 | /* legacy mode */ | |
6ea44308 | 807 | return bs->total_sectors * BDRV_SECTOR_SIZE; |
83f64091 FB |
808 | } |
809 | return drv->bdrv_getlength(bs); | |
fc01f7e7 FB |
810 | } |
811 | ||
19cb3738 | 812 | /* return 0 as number of sectors if no device present or error */ |
96b8f136 | 813 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
fc01f7e7 | 814 | { |
19cb3738 FB |
815 | int64_t length; |
816 | length = bdrv_getlength(bs); | |
817 | if (length < 0) | |
818 | length = 0; | |
819 | else | |
6ea44308 | 820 | length = length >> BDRV_SECTOR_BITS; |
19cb3738 | 821 | *nb_sectors_ptr = length; |
fc01f7e7 | 822 | } |
cf98951b | 823 | |
f3d54fc4 AL |
824 | struct partition { |
825 | uint8_t boot_ind; /* 0x80 - active */ | |
826 | uint8_t head; /* starting head */ | |
827 | uint8_t sector; /* starting sector */ | |
828 | uint8_t cyl; /* starting cylinder */ | |
829 | uint8_t sys_ind; /* What partition type */ | |
830 | uint8_t end_head; /* end head */ | |
831 | uint8_t end_sector; /* end sector */ | |
832 | uint8_t end_cyl; /* end cylinder */ | |
833 | uint32_t start_sect; /* starting sector counting from 0 */ | |
834 | uint32_t nr_sects; /* nr of sectors in partition */ | |
835 | } __attribute__((packed)); | |
836 | ||
837 | /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */ | |
838 | static int guess_disk_lchs(BlockDriverState *bs, | |
839 | int *pcylinders, int *pheads, int *psectors) | |
840 | { | |
841 | uint8_t buf[512]; | |
842 | int ret, i, heads, sectors, cylinders; | |
843 | struct partition *p; | |
844 | uint32_t nr_sects; | |
a38131b6 | 845 | uint64_t nb_sectors; |
f3d54fc4 AL |
846 | |
847 | bdrv_get_geometry(bs, &nb_sectors); | |
848 | ||
849 | ret = bdrv_read(bs, 0, buf, 1); | |
850 | if (ret < 0) | |
851 | return -1; | |
852 | /* test msdos magic */ | |
853 | if (buf[510] != 0x55 || buf[511] != 0xaa) | |
854 | return -1; | |
855 | for(i = 0; i < 4; i++) { | |
856 | p = ((struct partition *)(buf + 0x1be)) + i; | |
857 | nr_sects = le32_to_cpu(p->nr_sects); | |
858 | if (nr_sects && p->end_head) { | |
859 | /* We make the assumption that the partition terminates on | |
860 | a cylinder boundary */ | |
861 | heads = p->end_head + 1; | |
862 | sectors = p->end_sector & 63; | |
863 | if (sectors == 0) | |
864 | continue; | |
865 | cylinders = nb_sectors / (heads * sectors); | |
866 | if (cylinders < 1 || cylinders > 16383) | |
867 | continue; | |
868 | *pheads = heads; | |
869 | *psectors = sectors; | |
870 | *pcylinders = cylinders; | |
871 | #if 0 | |
872 | printf("guessed geometry: LCHS=%d %d %d\n", | |
873 | cylinders, heads, sectors); | |
874 | #endif | |
875 | return 0; | |
876 | } | |
877 | } | |
878 | return -1; | |
879 | } | |
880 | ||
881 | void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) | |
882 | { | |
883 | int translation, lba_detected = 0; | |
884 | int cylinders, heads, secs; | |
a38131b6 | 885 | uint64_t nb_sectors; |
f3d54fc4 AL |
886 | |
887 | /* if a geometry hint is available, use it */ | |
888 | bdrv_get_geometry(bs, &nb_sectors); | |
889 | bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); | |
890 | translation = bdrv_get_translation_hint(bs); | |
891 | if (cylinders != 0) { | |
892 | *pcyls = cylinders; | |
893 | *pheads = heads; | |
894 | *psecs = secs; | |
895 | } else { | |
896 | if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { | |
897 | if (heads > 16) { | |
898 | /* if heads > 16, it means that a BIOS LBA | |
899 | translation was active, so the default | |
900 | hardware geometry is OK */ | |
901 | lba_detected = 1; | |
902 | goto default_geometry; | |
903 | } else { | |
904 | *pcyls = cylinders; | |
905 | *pheads = heads; | |
906 | *psecs = secs; | |
907 | /* disable any translation to be in sync with | |
908 | the logical geometry */ | |
909 | if (translation == BIOS_ATA_TRANSLATION_AUTO) { | |
910 | bdrv_set_translation_hint(bs, | |
911 | BIOS_ATA_TRANSLATION_NONE); | |
912 | } | |
913 | } | |
914 | } else { | |
915 | default_geometry: | |
916 | /* if no geometry, use a standard physical disk geometry */ | |
917 | cylinders = nb_sectors / (16 * 63); | |
918 | ||
919 | if (cylinders > 16383) | |
920 | cylinders = 16383; | |
921 | else if (cylinders < 2) | |
922 | cylinders = 2; | |
923 | *pcyls = cylinders; | |
924 | *pheads = 16; | |
925 | *psecs = 63; | |
926 | if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { | |
927 | if ((*pcyls * *pheads) <= 131072) { | |
928 | bdrv_set_translation_hint(bs, | |
929 | BIOS_ATA_TRANSLATION_LARGE); | |
930 | } else { | |
931 | bdrv_set_translation_hint(bs, | |
932 | BIOS_ATA_TRANSLATION_LBA); | |
933 | } | |
934 | } | |
935 | } | |
936 | bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); | |
937 | } | |
938 | } | |
939 | ||
5fafdf24 | 940 | void bdrv_set_geometry_hint(BlockDriverState *bs, |
b338082b FB |
941 | int cyls, int heads, int secs) |
942 | { | |
943 | bs->cyls = cyls; | |
944 | bs->heads = heads; | |
945 | bs->secs = secs; | |
946 | } | |
947 | ||
948 | void bdrv_set_type_hint(BlockDriverState *bs, int type) | |
949 | { | |
950 | bs->type = type; | |
951 | bs->removable = ((type == BDRV_TYPE_CDROM || | |
952 | type == BDRV_TYPE_FLOPPY)); | |
953 | } | |
954 | ||
46d4767d FB |
955 | void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
956 | { | |
957 | bs->translation = translation; | |
958 | } | |
959 | ||
5fafdf24 | 960 | void bdrv_get_geometry_hint(BlockDriverState *bs, |
b338082b FB |
961 | int *pcyls, int *pheads, int *psecs) |
962 | { | |
963 | *pcyls = bs->cyls; | |
964 | *pheads = bs->heads; | |
965 | *psecs = bs->secs; | |
966 | } | |
967 | ||
968 | int bdrv_get_type_hint(BlockDriverState *bs) | |
969 | { | |
970 | return bs->type; | |
971 | } | |
972 | ||
46d4767d FB |
973 | int bdrv_get_translation_hint(BlockDriverState *bs) |
974 | { | |
975 | return bs->translation; | |
976 | } | |
977 | ||
b338082b FB |
978 | int bdrv_is_removable(BlockDriverState *bs) |
979 | { | |
980 | return bs->removable; | |
981 | } | |
982 | ||
983 | int bdrv_is_read_only(BlockDriverState *bs) | |
984 | { | |
985 | return bs->read_only; | |
986 | } | |
987 | ||
59f2689d NS |
988 | int bdrv_set_read_only(BlockDriverState *bs, int read_only) |
989 | { | |
990 | int ret = bs->read_only; | |
991 | bs->read_only = read_only; | |
992 | return ret; | |
993 | } | |
994 | ||
985a03b0 TS |
995 | int bdrv_is_sg(BlockDriverState *bs) |
996 | { | |
997 | return bs->sg; | |
998 | } | |
999 | ||
e900a7b7 CH |
1000 | int bdrv_enable_write_cache(BlockDriverState *bs) |
1001 | { | |
1002 | return bs->enable_write_cache; | |
1003 | } | |
1004 | ||
19cb3738 | 1005 | /* XXX: no longer used */ |
5fafdf24 | 1006 | void bdrv_set_change_cb(BlockDriverState *bs, |
b338082b FB |
1007 | void (*change_cb)(void *opaque), void *opaque) |
1008 | { | |
1009 | bs->change_cb = change_cb; | |
1010 | bs->change_opaque = opaque; | |
1011 | } | |
1012 | ||
ea2384d3 FB |
1013 | int bdrv_is_encrypted(BlockDriverState *bs) |
1014 | { | |
1015 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
1016 | return 1; | |
1017 | return bs->encrypted; | |
1018 | } | |
1019 | ||
c0f4ce77 AL |
1020 | int bdrv_key_required(BlockDriverState *bs) |
1021 | { | |
1022 | BlockDriverState *backing_hd = bs->backing_hd; | |
1023 | ||
1024 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) | |
1025 | return 1; | |
1026 | return (bs->encrypted && !bs->valid_key); | |
1027 | } | |
1028 | ||
ea2384d3 FB |
1029 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
1030 | { | |
1031 | int ret; | |
1032 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
1033 | ret = bdrv_set_key(bs->backing_hd, key); | |
1034 | if (ret < 0) | |
1035 | return ret; | |
1036 | if (!bs->encrypted) | |
1037 | return 0; | |
1038 | } | |
1039 | if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key) | |
1040 | return -1; | |
c0f4ce77 | 1041 | ret = bs->drv->bdrv_set_key(bs, key); |
bb5fc20f AL |
1042 | if (ret < 0) { |
1043 | bs->valid_key = 0; | |
1044 | } else if (!bs->valid_key) { | |
1045 | bs->valid_key = 1; | |
1046 | /* call the change callback now, we skipped it on open */ | |
1047 | bs->media_changed = 1; | |
1048 | if (bs->change_cb) | |
1049 | bs->change_cb(bs->change_opaque); | |
1050 | } | |
c0f4ce77 | 1051 | return ret; |
ea2384d3 FB |
1052 | } |
1053 | ||
1054 | void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) | |
1055 | { | |
19cb3738 | 1056 | if (!bs->drv) { |
ea2384d3 FB |
1057 | buf[0] = '\0'; |
1058 | } else { | |
1059 | pstrcpy(buf, buf_size, bs->drv->format_name); | |
1060 | } | |
1061 | } | |
1062 | ||
5fafdf24 | 1063 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
ea2384d3 FB |
1064 | void *opaque) |
1065 | { | |
1066 | BlockDriver *drv; | |
1067 | ||
1068 | for (drv = first_drv; drv != NULL; drv = drv->next) { | |
1069 | it(opaque, drv->format_name); | |
1070 | } | |
1071 | } | |
1072 | ||
b338082b FB |
1073 | BlockDriverState *bdrv_find(const char *name) |
1074 | { | |
1075 | BlockDriverState *bs; | |
1076 | ||
1077 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
1078 | if (!strcmp(name, bs->device_name)) | |
1079 | return bs; | |
1080 | } | |
1081 | return NULL; | |
1082 | } | |
1083 | ||
51de9760 | 1084 | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
81d0912d FB |
1085 | { |
1086 | BlockDriverState *bs; | |
1087 | ||
1088 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
51de9760 | 1089 | it(opaque, bs); |
81d0912d FB |
1090 | } |
1091 | } | |
1092 | ||
ea2384d3 FB |
1093 | const char *bdrv_get_device_name(BlockDriverState *bs) |
1094 | { | |
1095 | return bs->device_name; | |
1096 | } | |
1097 | ||
7a6cba61 PB |
1098 | void bdrv_flush(BlockDriverState *bs) |
1099 | { | |
081501da AL |
1100 | if (!bs->drv) |
1101 | return; | |
7a6cba61 PB |
1102 | if (bs->drv->bdrv_flush) |
1103 | bs->drv->bdrv_flush(bs); | |
1104 | if (bs->backing_hd) | |
1105 | bdrv_flush(bs->backing_hd); | |
1106 | } | |
1107 | ||
c6ca28d6 AL |
1108 | void bdrv_flush_all(void) |
1109 | { | |
1110 | BlockDriverState *bs; | |
1111 | ||
1112 | for (bs = bdrv_first; bs != NULL; bs = bs->next) | |
1113 | if (bs->drv && !bdrv_is_read_only(bs) && | |
1114 | (!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) | |
1115 | bdrv_flush(bs); | |
1116 | } | |
1117 | ||
f58c7b35 TS |
1118 | /* |
1119 | * Returns true iff the specified sector is present in the disk image. Drivers | |
1120 | * not implementing the functionality are assumed to not support backing files, | |
1121 | * hence all their sectors are reported as allocated. | |
1122 | * | |
1123 | * 'pnum' is set to the number of sectors (including and immediately following | |
1124 | * the specified sector) that are known to be in the same | |
1125 | * allocated/unallocated state. | |
1126 | * | |
1127 | * 'nb_sectors' is the max value 'pnum' should be set to. | |
1128 | */ | |
1129 | int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, | |
1130 | int *pnum) | |
1131 | { | |
1132 | int64_t n; | |
1133 | if (!bs->drv->bdrv_is_allocated) { | |
1134 | if (sector_num >= bs->total_sectors) { | |
1135 | *pnum = 0; | |
1136 | return 0; | |
1137 | } | |
1138 | n = bs->total_sectors - sector_num; | |
1139 | *pnum = (n < nb_sectors) ? (n) : (nb_sectors); | |
1140 | return 1; | |
1141 | } | |
1142 | return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum); | |
1143 | } | |
1144 | ||
4305793b | 1145 | static void bdrv_print_dict(QObject *obj, void *opaque) |
b338082b | 1146 | { |
4305793b LC |
1147 | QDict *bs_dict; |
1148 | Monitor *mon = opaque; | |
1149 | ||
1150 | bs_dict = qobject_to_qdict(obj); | |
1151 | ||
1152 | monitor_printf(mon, "%s: type=%s removable=%d", | |
1153 | qdict_get_str(bs_dict, "device"), | |
1154 | qdict_get_str(bs_dict, "type"), | |
1155 | qdict_get_bool(bs_dict, "removable")); | |
1156 | ||
1157 | if (qdict_get_bool(bs_dict, "removable")) { | |
1158 | monitor_printf(mon, " locked=%d", qdict_get_bool(bs_dict, "locked")); | |
1159 | } | |
1160 | ||
1161 | if (qdict_haskey(bs_dict, "inserted")) { | |
1162 | QDict *qdict = qobject_to_qdict(qdict_get(bs_dict, "inserted")); | |
1163 | ||
1164 | monitor_printf(mon, " file="); | |
1165 | monitor_print_filename(mon, qdict_get_str(qdict, "file")); | |
1166 | if (qdict_haskey(qdict, "backing_file")) { | |
1167 | monitor_printf(mon, " backing_file="); | |
1168 | monitor_print_filename(mon, qdict_get_str(qdict, "backing_file")); | |
1169 | } | |
1170 | monitor_printf(mon, " ro=%d drv=%s encrypted=%d", | |
1171 | qdict_get_bool(qdict, "ro"), | |
1172 | qdict_get_str(qdict, "drv"), | |
1173 | qdict_get_bool(qdict, "encrypted")); | |
1174 | } else { | |
1175 | monitor_printf(mon, " [not inserted]"); | |
1176 | } | |
1177 | ||
1178 | monitor_printf(mon, "\n"); | |
1179 | } | |
1180 | ||
1181 | void bdrv_info_print(Monitor *mon, const QObject *data) | |
1182 | { | |
1183 | qlist_iter(qobject_to_qlist(data), bdrv_print_dict, mon); | |
1184 | } | |
1185 | ||
1186 | /** | |
1187 | * bdrv_info(): Block devices information | |
1188 | * | |
1189 | * Each block device information is stored in a QDict and the | |
1190 | * returned QObject is a QList of all devices. | |
1191 | * | |
1192 | * The QDict contains the following: | |
1193 | * | |
1194 | * - "device": device name | |
1195 | * - "type": device type | |
1196 | * - "removable": true if the device is removable, false otherwise | |
1197 | * - "locked": true if the device is locked, false otherwise | |
1198 | * - "inserted": only present if the device is inserted, it is a QDict | |
1199 | * containing the following: | |
1200 | * - "file": device file name | |
1201 | * - "ro": true if read-only, false otherwise | |
1202 | * - "drv": driver format name | |
1203 | * - "backing_file": backing file name if one is used | |
1204 | * - "encrypted": true if encrypted, false otherwise | |
1205 | * | |
1206 | * Example: | |
1207 | * | |
1208 | * [ { "device": "ide0-hd0", "type": "hd", "removable": false, "locked": false, | |
1209 | * "inserted": { "file": "/tmp/foobar", "ro": false, "drv": "qcow2" } }, | |
1210 | * { "device": "floppy0", "type": "floppy", "removable": true, | |
1211 | * "locked": false } ] | |
1212 | */ | |
1213 | void bdrv_info(Monitor *mon, QObject **ret_data) | |
1214 | { | |
1215 | QList *bs_list; | |
b338082b FB |
1216 | BlockDriverState *bs; |
1217 | ||
4305793b LC |
1218 | bs_list = qlist_new(); |
1219 | ||
b338082b | 1220 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
4305793b LC |
1221 | QObject *bs_obj; |
1222 | const char *type = "unknown"; | |
1223 | ||
b338082b FB |
1224 | switch(bs->type) { |
1225 | case BDRV_TYPE_HD: | |
4305793b | 1226 | type = "hd"; |
b338082b FB |
1227 | break; |
1228 | case BDRV_TYPE_CDROM: | |
4305793b | 1229 | type = "cdrom"; |
b338082b FB |
1230 | break; |
1231 | case BDRV_TYPE_FLOPPY: | |
4305793b | 1232 | type = "floppy"; |
b338082b FB |
1233 | break; |
1234 | } | |
4305793b LC |
1235 | |
1236 | bs_obj = qobject_from_jsonf("{ 'device': %s, 'type': %s, " | |
1237 | "'removable': %i, 'locked': %i }", | |
1238 | bs->device_name, type, bs->removable, | |
1239 | bs->locked); | |
1240 | assert(bs_obj != NULL); | |
1241 | ||
19cb3738 | 1242 | if (bs->drv) { |
4305793b LC |
1243 | QObject *obj; |
1244 | QDict *bs_dict = qobject_to_qdict(bs_obj); | |
1245 | ||
1246 | obj = qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, " | |
1247 | "'encrypted': %i }", | |
1248 | bs->filename, bs->read_only, | |
1249 | bs->drv->format_name, | |
1250 | bdrv_is_encrypted(bs)); | |
1251 | assert(obj != NULL); | |
fef30743 | 1252 | if (bs->backing_file[0] != '\0') { |
4305793b LC |
1253 | QDict *qdict = qobject_to_qdict(obj); |
1254 | qdict_put(qdict, "backing_file", | |
1255 | qstring_from_str(bs->backing_file)); | |
376253ec | 1256 | } |
4305793b LC |
1257 | |
1258 | qdict_put_obj(bs_dict, "inserted", obj); | |
b338082b | 1259 | } |
4305793b | 1260 | qlist_append_obj(bs_list, bs_obj); |
b338082b | 1261 | } |
4305793b LC |
1262 | |
1263 | *ret_data = QOBJECT(bs_list); | |
b338082b | 1264 | } |
a36e69dd | 1265 | |
0108d4e3 | 1266 | static void bdrv_stats_iter(QObject *data, void *opaque) |
a36e69dd | 1267 | { |
0108d4e3 LC |
1268 | QDict *qdict; |
1269 | Monitor *mon = opaque; | |
1270 | ||
1271 | qdict = qobject_to_qdict(data); | |
1272 | monitor_printf(mon, "%s:", qdict_get_str(qdict, "device")); | |
1273 | ||
1274 | qdict = qobject_to_qdict(qdict_get(qdict, "stats")); | |
1275 | monitor_printf(mon, " rd_bytes=%" PRId64 | |
1276 | " wr_bytes=%" PRId64 | |
1277 | " rd_operations=%" PRId64 | |
1278 | " wr_operations=%" PRId64 | |
1279 | "\n", | |
1280 | qdict_get_int(qdict, "rd_bytes"), | |
1281 | qdict_get_int(qdict, "wr_bytes"), | |
1282 | qdict_get_int(qdict, "rd_operations"), | |
1283 | qdict_get_int(qdict, "wr_operations")); | |
1284 | } | |
1285 | ||
1286 | void bdrv_stats_print(Monitor *mon, const QObject *data) | |
1287 | { | |
1288 | qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon); | |
1289 | } | |
1290 | ||
1291 | /** | |
1292 | * bdrv_info_stats(): show block device statistics | |
1293 | * | |
1294 | * Each device statistic information is stored in a QDict and | |
1295 | * the returned QObject is a QList of all devices. | |
1296 | * | |
1297 | * The QDict contains the following: | |
1298 | * | |
1299 | * - "device": device name | |
1300 | * - "stats": A QDict with the statistics information, it contains: | |
1301 | * - "rd_bytes": bytes read | |
1302 | * - "wr_bytes": bytes written | |
1303 | * - "rd_operations": read operations | |
1304 | * - "wr_operations": write operations | |
1305 | * | |
1306 | * Example: | |
1307 | * | |
1308 | * [ { "device": "ide0-hd0", | |
1309 | * "stats": { "rd_bytes": 512, | |
1310 | * "wr_bytes": 0, | |
1311 | * "rd_operations": 1, | |
1312 | * "wr_operations": 0 } }, | |
1313 | * { "device": "ide1-cd0", | |
1314 | * "stats": { "rd_bytes": 0, | |
1315 | * "wr_bytes": 0, | |
1316 | * "rd_operations": 0, | |
1317 | * "wr_operations": 0 } } ] | |
1318 | */ | |
1319 | void bdrv_info_stats(Monitor *mon, QObject **ret_data) | |
1320 | { | |
1321 | QObject *obj; | |
1322 | QList *devices; | |
a36e69dd TS |
1323 | BlockDriverState *bs; |
1324 | ||
0108d4e3 LC |
1325 | devices = qlist_new(); |
1326 | ||
a36e69dd | 1327 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
0108d4e3 LC |
1328 | obj = qobject_from_jsonf("{ 'device': %s, 'stats': {" |
1329 | "'rd_bytes': %" PRId64 "," | |
1330 | "'wr_bytes': %" PRId64 "," | |
1331 | "'rd_operations': %" PRId64 "," | |
1332 | "'wr_operations': %" PRId64 | |
1333 | "} }", | |
1334 | bs->device_name, | |
1335 | bs->rd_bytes, bs->wr_bytes, | |
1336 | bs->rd_ops, bs->wr_ops); | |
1337 | assert(obj != NULL); | |
1338 | qlist_append_obj(devices, obj); | |
a36e69dd | 1339 | } |
0108d4e3 LC |
1340 | |
1341 | *ret_data = QOBJECT(devices); | |
a36e69dd | 1342 | } |
ea2384d3 | 1343 | |
045df330 AL |
1344 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
1345 | { | |
1346 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
1347 | return bs->backing_file; | |
1348 | else if (bs->encrypted) | |
1349 | return bs->filename; | |
1350 | else | |
1351 | return NULL; | |
1352 | } | |
1353 | ||
5fafdf24 | 1354 | void bdrv_get_backing_filename(BlockDriverState *bs, |
83f64091 FB |
1355 | char *filename, int filename_size) |
1356 | { | |
1357 | if (!bs->backing_hd) { | |
1358 | pstrcpy(filename, filename_size, ""); | |
1359 | } else { | |
1360 | pstrcpy(filename, filename_size, bs->backing_file); | |
1361 | } | |
1362 | } | |
1363 | ||
5fafdf24 | 1364 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
faea38e7 FB |
1365 | const uint8_t *buf, int nb_sectors) |
1366 | { | |
1367 | BlockDriver *drv = bs->drv; | |
1368 | if (!drv) | |
19cb3738 | 1369 | return -ENOMEDIUM; |
faea38e7 FB |
1370 | if (!drv->bdrv_write_compressed) |
1371 | return -ENOTSUP; | |
fbb7b4e0 KW |
1372 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
1373 | return -EIO; | |
a55eb92c | 1374 | |
c6d22830 | 1375 | if (bs->dirty_bitmap) { |
7cd1e32a | 1376 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
1377 | } | |
a55eb92c | 1378 | |
faea38e7 FB |
1379 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
1380 | } | |
3b46e624 | 1381 | |
faea38e7 FB |
1382 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
1383 | { | |
1384 | BlockDriver *drv = bs->drv; | |
1385 | if (!drv) | |
19cb3738 | 1386 | return -ENOMEDIUM; |
faea38e7 FB |
1387 | if (!drv->bdrv_get_info) |
1388 | return -ENOTSUP; | |
1389 | memset(bdi, 0, sizeof(*bdi)); | |
1390 | return drv->bdrv_get_info(bs, bdi); | |
1391 | } | |
1392 | ||
45566e9c CH |
1393 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
1394 | int64_t pos, int size) | |
178e08a5 AL |
1395 | { |
1396 | BlockDriver *drv = bs->drv; | |
1397 | if (!drv) | |
1398 | return -ENOMEDIUM; | |
45566e9c | 1399 | if (!drv->bdrv_save_vmstate) |
178e08a5 | 1400 | return -ENOTSUP; |
45566e9c | 1401 | return drv->bdrv_save_vmstate(bs, buf, pos, size); |
178e08a5 AL |
1402 | } |
1403 | ||
45566e9c CH |
1404 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
1405 | int64_t pos, int size) | |
178e08a5 AL |
1406 | { |
1407 | BlockDriver *drv = bs->drv; | |
1408 | if (!drv) | |
1409 | return -ENOMEDIUM; | |
45566e9c | 1410 | if (!drv->bdrv_load_vmstate) |
178e08a5 | 1411 | return -ENOTSUP; |
45566e9c | 1412 | return drv->bdrv_load_vmstate(bs, buf, pos, size); |
178e08a5 AL |
1413 | } |
1414 | ||
faea38e7 FB |
1415 | /**************************************************************/ |
1416 | /* handling of snapshots */ | |
1417 | ||
5fafdf24 | 1418 | int bdrv_snapshot_create(BlockDriverState *bs, |
faea38e7 FB |
1419 | QEMUSnapshotInfo *sn_info) |
1420 | { | |
1421 | BlockDriver *drv = bs->drv; | |
1422 | if (!drv) | |
19cb3738 | 1423 | return -ENOMEDIUM; |
faea38e7 FB |
1424 | if (!drv->bdrv_snapshot_create) |
1425 | return -ENOTSUP; | |
1426 | return drv->bdrv_snapshot_create(bs, sn_info); | |
1427 | } | |
1428 | ||
5fafdf24 | 1429 | int bdrv_snapshot_goto(BlockDriverState *bs, |
faea38e7 FB |
1430 | const char *snapshot_id) |
1431 | { | |
1432 | BlockDriver *drv = bs->drv; | |
1433 | if (!drv) | |
19cb3738 | 1434 | return -ENOMEDIUM; |
faea38e7 FB |
1435 | if (!drv->bdrv_snapshot_goto) |
1436 | return -ENOTSUP; | |
1437 | return drv->bdrv_snapshot_goto(bs, snapshot_id); | |
1438 | } | |
1439 | ||
1440 | int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) | |
1441 | { | |
1442 | BlockDriver *drv = bs->drv; | |
1443 | if (!drv) | |
19cb3738 | 1444 | return -ENOMEDIUM; |
faea38e7 FB |
1445 | if (!drv->bdrv_snapshot_delete) |
1446 | return -ENOTSUP; | |
1447 | return drv->bdrv_snapshot_delete(bs, snapshot_id); | |
1448 | } | |
1449 | ||
5fafdf24 | 1450 | int bdrv_snapshot_list(BlockDriverState *bs, |
faea38e7 FB |
1451 | QEMUSnapshotInfo **psn_info) |
1452 | { | |
1453 | BlockDriver *drv = bs->drv; | |
1454 | if (!drv) | |
19cb3738 | 1455 | return -ENOMEDIUM; |
faea38e7 FB |
1456 | if (!drv->bdrv_snapshot_list) |
1457 | return -ENOTSUP; | |
1458 | return drv->bdrv_snapshot_list(bs, psn_info); | |
1459 | } | |
1460 | ||
1461 | #define NB_SUFFIXES 4 | |
1462 | ||
1463 | char *get_human_readable_size(char *buf, int buf_size, int64_t size) | |
1464 | { | |
1465 | static const char suffixes[NB_SUFFIXES] = "KMGT"; | |
1466 | int64_t base; | |
1467 | int i; | |
1468 | ||
1469 | if (size <= 999) { | |
1470 | snprintf(buf, buf_size, "%" PRId64, size); | |
1471 | } else { | |
1472 | base = 1024; | |
1473 | for(i = 0; i < NB_SUFFIXES; i++) { | |
1474 | if (size < (10 * base)) { | |
5fafdf24 | 1475 | snprintf(buf, buf_size, "%0.1f%c", |
faea38e7 FB |
1476 | (double)size / base, |
1477 | suffixes[i]); | |
1478 | break; | |
1479 | } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { | |
5fafdf24 | 1480 | snprintf(buf, buf_size, "%" PRId64 "%c", |
faea38e7 FB |
1481 | ((size + (base >> 1)) / base), |
1482 | suffixes[i]); | |
1483 | break; | |
1484 | } | |
1485 | base = base * 1024; | |
1486 | } | |
1487 | } | |
1488 | return buf; | |
1489 | } | |
1490 | ||
1491 | char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) | |
1492 | { | |
1493 | char buf1[128], date_buf[128], clock_buf[128]; | |
3b9f94e1 FB |
1494 | #ifdef _WIN32 |
1495 | struct tm *ptm; | |
1496 | #else | |
faea38e7 | 1497 | struct tm tm; |
3b9f94e1 | 1498 | #endif |
faea38e7 FB |
1499 | time_t ti; |
1500 | int64_t secs; | |
1501 | ||
1502 | if (!sn) { | |
5fafdf24 TS |
1503 | snprintf(buf, buf_size, |
1504 | "%-10s%-20s%7s%20s%15s", | |
faea38e7 FB |
1505 | "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
1506 | } else { | |
1507 | ti = sn->date_sec; | |
3b9f94e1 FB |
1508 | #ifdef _WIN32 |
1509 | ptm = localtime(&ti); | |
1510 | strftime(date_buf, sizeof(date_buf), | |
1511 | "%Y-%m-%d %H:%M:%S", ptm); | |
1512 | #else | |
faea38e7 FB |
1513 | localtime_r(&ti, &tm); |
1514 | strftime(date_buf, sizeof(date_buf), | |
1515 | "%Y-%m-%d %H:%M:%S", &tm); | |
3b9f94e1 | 1516 | #endif |
faea38e7 FB |
1517 | secs = sn->vm_clock_nsec / 1000000000; |
1518 | snprintf(clock_buf, sizeof(clock_buf), | |
1519 | "%02d:%02d:%02d.%03d", | |
1520 | (int)(secs / 3600), | |
1521 | (int)((secs / 60) % 60), | |
5fafdf24 | 1522 | (int)(secs % 60), |
faea38e7 FB |
1523 | (int)((sn->vm_clock_nsec / 1000000) % 1000)); |
1524 | snprintf(buf, buf_size, | |
5fafdf24 | 1525 | "%-10s%-20s%7s%20s%15s", |
faea38e7 FB |
1526 | sn->id_str, sn->name, |
1527 | get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), | |
1528 | date_buf, | |
1529 | clock_buf); | |
1530 | } | |
1531 | return buf; | |
1532 | } | |
1533 | ||
83f64091 | 1534 | |
ea2384d3 | 1535 | /**************************************************************/ |
83f64091 | 1536 | /* async I/Os */ |
ea2384d3 | 1537 | |
3b69e4b9 | 1538 | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
f141eafe | 1539 | QEMUIOVector *qiov, int nb_sectors, |
3b69e4b9 | 1540 | BlockDriverCompletionFunc *cb, void *opaque) |
83f64091 FB |
1541 | { |
1542 | BlockDriver *drv = bs->drv; | |
a36e69dd | 1543 | BlockDriverAIOCB *ret; |
83f64091 | 1544 | |
19cb3738 | 1545 | if (!drv) |
ce1a14dc | 1546 | return NULL; |
71d0770c AL |
1547 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
1548 | return NULL; | |
3b46e624 | 1549 | |
f141eafe AL |
1550 | ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors, |
1551 | cb, opaque); | |
a36e69dd TS |
1552 | |
1553 | if (ret) { | |
1554 | /* Update stats even though technically transfer has not happened. */ | |
6ea44308 | 1555 | bs->rd_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE; |
a36e69dd TS |
1556 | bs->rd_ops ++; |
1557 | } | |
1558 | ||
1559 | return ret; | |
ea2384d3 FB |
1560 | } |
1561 | ||
f141eafe AL |
1562 | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
1563 | QEMUIOVector *qiov, int nb_sectors, | |
1564 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 1565 | { |
83f64091 | 1566 | BlockDriver *drv = bs->drv; |
a36e69dd | 1567 | BlockDriverAIOCB *ret; |
ea2384d3 | 1568 | |
19cb3738 | 1569 | if (!drv) |
ce1a14dc | 1570 | return NULL; |
83f64091 | 1571 | if (bs->read_only) |
ce1a14dc | 1572 | return NULL; |
71d0770c AL |
1573 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
1574 | return NULL; | |
83f64091 | 1575 | |
c6d22830 | 1576 | if (bs->dirty_bitmap) { |
7cd1e32a | 1577 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
1578 | } | |
a55eb92c | 1579 | |
f141eafe AL |
1580 | ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors, |
1581 | cb, opaque); | |
a36e69dd TS |
1582 | |
1583 | if (ret) { | |
1584 | /* Update stats even though technically transfer has not happened. */ | |
6ea44308 | 1585 | bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE; |
a36e69dd TS |
1586 | bs->wr_ops ++; |
1587 | } | |
1588 | ||
1589 | return ret; | |
83f64091 FB |
1590 | } |
1591 | ||
40b4f539 KW |
1592 | |
1593 | typedef struct MultiwriteCB { | |
1594 | int error; | |
1595 | int num_requests; | |
1596 | int num_callbacks; | |
1597 | struct { | |
1598 | BlockDriverCompletionFunc *cb; | |
1599 | void *opaque; | |
1600 | QEMUIOVector *free_qiov; | |
1601 | void *free_buf; | |
1602 | } callbacks[]; | |
1603 | } MultiwriteCB; | |
1604 | ||
1605 | static void multiwrite_user_cb(MultiwriteCB *mcb) | |
1606 | { | |
1607 | int i; | |
1608 | ||
1609 | for (i = 0; i < mcb->num_callbacks; i++) { | |
1610 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); | |
012d4869 SH |
1611 | if (mcb->callbacks[i].free_qiov) { |
1612 | qemu_iovec_destroy(mcb->callbacks[i].free_qiov); | |
1613 | } | |
40b4f539 | 1614 | qemu_free(mcb->callbacks[i].free_qiov); |
a1a86bf9 | 1615 | qemu_vfree(mcb->callbacks[i].free_buf); |
40b4f539 KW |
1616 | } |
1617 | } | |
1618 | ||
1619 | static void multiwrite_cb(void *opaque, int ret) | |
1620 | { | |
1621 | MultiwriteCB *mcb = opaque; | |
1622 | ||
aba52882 | 1623 | if (ret < 0 && !mcb->error) { |
40b4f539 KW |
1624 | mcb->error = ret; |
1625 | multiwrite_user_cb(mcb); | |
1626 | } | |
1627 | ||
1628 | mcb->num_requests--; | |
1629 | if (mcb->num_requests == 0) { | |
1630 | if (mcb->error == 0) { | |
1631 | multiwrite_user_cb(mcb); | |
1632 | } | |
1633 | qemu_free(mcb); | |
1634 | } | |
1635 | } | |
1636 | ||
1637 | static int multiwrite_req_compare(const void *a, const void *b) | |
1638 | { | |
1639 | return (((BlockRequest*) a)->sector - ((BlockRequest*) b)->sector); | |
1640 | } | |
1641 | ||
1642 | /* | |
1643 | * Takes a bunch of requests and tries to merge them. Returns the number of | |
1644 | * requests that remain after merging. | |
1645 | */ | |
1646 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, | |
1647 | int num_reqs, MultiwriteCB *mcb) | |
1648 | { | |
1649 | int i, outidx; | |
1650 | ||
1651 | // Sort requests by start sector | |
1652 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); | |
1653 | ||
1654 | // Check if adjacent requests touch the same clusters. If so, combine them, | |
1655 | // filling up gaps with zero sectors. | |
1656 | outidx = 0; | |
1657 | for (i = 1; i < num_reqs; i++) { | |
1658 | int merge = 0; | |
1659 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; | |
1660 | ||
1661 | // This handles the cases that are valid for all block drivers, namely | |
1662 | // exactly sequential writes and overlapping writes. | |
1663 | if (reqs[i].sector <= oldreq_last) { | |
1664 | merge = 1; | |
1665 | } | |
1666 | ||
1667 | // The block driver may decide that it makes sense to combine requests | |
1668 | // even if there is a gap of some sectors between them. In this case, | |
1669 | // the gap is filled with zeros (therefore only applicable for yet | |
1670 | // unused space in format like qcow2). | |
1671 | if (!merge && bs->drv->bdrv_merge_requests) { | |
1672 | merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]); | |
1673 | } | |
1674 | ||
de17c16e CH |
1675 | if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
1676 | merge = 0; | |
1677 | } | |
1678 | ||
40b4f539 KW |
1679 | if (merge) { |
1680 | size_t size; | |
1681 | QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov)); | |
1682 | qemu_iovec_init(qiov, | |
1683 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); | |
1684 | ||
1685 | // Add the first request to the merged one. If the requests are | |
1686 | // overlapping, drop the last sectors of the first request. | |
1687 | size = (reqs[i].sector - reqs[outidx].sector) << 9; | |
1688 | qemu_iovec_concat(qiov, reqs[outidx].qiov, size); | |
1689 | ||
1690 | // We might need to add some zeros between the two requests | |
1691 | if (reqs[i].sector > oldreq_last) { | |
1692 | size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9; | |
1693 | uint8_t *buf = qemu_blockalign(bs, zero_bytes); | |
1694 | memset(buf, 0, zero_bytes); | |
1695 | qemu_iovec_add(qiov, buf, zero_bytes); | |
1696 | mcb->callbacks[i].free_buf = buf; | |
1697 | } | |
1698 | ||
1699 | // Add the second request | |
1700 | qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size); | |
1701 | ||
1702 | reqs[outidx].nb_sectors += reqs[i].nb_sectors; | |
1703 | reqs[outidx].qiov = qiov; | |
1704 | ||
1705 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; | |
1706 | } else { | |
1707 | outidx++; | |
1708 | reqs[outidx].sector = reqs[i].sector; | |
1709 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; | |
1710 | reqs[outidx].qiov = reqs[i].qiov; | |
1711 | } | |
1712 | } | |
1713 | ||
1714 | return outidx + 1; | |
1715 | } | |
1716 | ||
1717 | /* | |
1718 | * Submit multiple AIO write requests at once. | |
1719 | * | |
1720 | * On success, the function returns 0 and all requests in the reqs array have | |
1721 | * been submitted. In error case this function returns -1, and any of the | |
1722 | * requests may or may not be submitted yet. In particular, this means that the | |
1723 | * callback will be called for some of the requests, for others it won't. The | |
1724 | * caller must check the error field of the BlockRequest to wait for the right | |
1725 | * callbacks (if error != 0, no callback will be called). | |
1726 | * | |
1727 | * The implementation may modify the contents of the reqs array, e.g. to merge | |
1728 | * requests. However, the fields opaque and error are left unmodified as they | |
1729 | * are used to signal failure for a single request to the caller. | |
1730 | */ | |
1731 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) | |
1732 | { | |
1733 | BlockDriverAIOCB *acb; | |
1734 | MultiwriteCB *mcb; | |
1735 | int i; | |
1736 | ||
1737 | if (num_reqs == 0) { | |
1738 | return 0; | |
1739 | } | |
1740 | ||
1741 | // Create MultiwriteCB structure | |
1742 | mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); | |
1743 | mcb->num_requests = 0; | |
1744 | mcb->num_callbacks = num_reqs; | |
1745 | ||
1746 | for (i = 0; i < num_reqs; i++) { | |
1747 | mcb->callbacks[i].cb = reqs[i].cb; | |
1748 | mcb->callbacks[i].opaque = reqs[i].opaque; | |
1749 | } | |
1750 | ||
1751 | // Check for mergable requests | |
1752 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); | |
1753 | ||
1754 | // Run the aio requests | |
1755 | for (i = 0; i < num_reqs; i++) { | |
1756 | acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, | |
1757 | reqs[i].nb_sectors, multiwrite_cb, mcb); | |
1758 | ||
1759 | if (acb == NULL) { | |
1760 | // We can only fail the whole thing if no request has been | |
1761 | // submitted yet. Otherwise we'll wait for the submitted AIOs to | |
1762 | // complete and report the error in the callback. | |
1763 | if (mcb->num_requests == 0) { | |
ffac613f | 1764 | reqs[i].error = -EIO; |
40b4f539 KW |
1765 | goto fail; |
1766 | } else { | |
46223172 KW |
1767 | mcb->num_requests++; |
1768 | multiwrite_cb(mcb, -EIO); | |
40b4f539 KW |
1769 | break; |
1770 | } | |
1771 | } else { | |
1772 | mcb->num_requests++; | |
1773 | } | |
1774 | } | |
1775 | ||
1776 | return 0; | |
1777 | ||
1778 | fail: | |
1779 | free(mcb); | |
1780 | return -1; | |
1781 | } | |
1782 | ||
b2e12bc6 CH |
1783 | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
1784 | BlockDriverCompletionFunc *cb, void *opaque) | |
1785 | { | |
1786 | BlockDriver *drv = bs->drv; | |
1787 | ||
1788 | if (!drv) | |
1789 | return NULL; | |
1790 | ||
1791 | /* | |
1792 | * Note that unlike bdrv_flush the driver is reponsible for flushing a | |
1793 | * backing image if it exists. | |
1794 | */ | |
1795 | return drv->bdrv_aio_flush(bs, cb, opaque); | |
1796 | } | |
1797 | ||
83f64091 | 1798 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
83f64091 | 1799 | { |
6bbff9a0 | 1800 | acb->pool->cancel(acb); |
83f64091 FB |
1801 | } |
1802 | ||
ce1a14dc | 1803 | |
83f64091 FB |
1804 | /**************************************************************/ |
1805 | /* async block device emulation */ | |
1806 | ||
c16b5a2c CH |
1807 | typedef struct BlockDriverAIOCBSync { |
1808 | BlockDriverAIOCB common; | |
1809 | QEMUBH *bh; | |
1810 | int ret; | |
1811 | /* vector translation state */ | |
1812 | QEMUIOVector *qiov; | |
1813 | uint8_t *bounce; | |
1814 | int is_write; | |
1815 | } BlockDriverAIOCBSync; | |
1816 | ||
1817 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) | |
1818 | { | |
1819 | BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb; | |
6a7ad299 | 1820 | qemu_bh_delete(acb->bh); |
36afc451 | 1821 | acb->bh = NULL; |
c16b5a2c CH |
1822 | qemu_aio_release(acb); |
1823 | } | |
1824 | ||
1825 | static AIOPool bdrv_em_aio_pool = { | |
1826 | .aiocb_size = sizeof(BlockDriverAIOCBSync), | |
1827 | .cancel = bdrv_aio_cancel_em, | |
1828 | }; | |
1829 | ||
ce1a14dc | 1830 | static void bdrv_aio_bh_cb(void *opaque) |
83f64091 | 1831 | { |
ce1a14dc | 1832 | BlockDriverAIOCBSync *acb = opaque; |
f141eafe | 1833 | |
f141eafe AL |
1834 | if (!acb->is_write) |
1835 | qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); | |
ceb42de8 | 1836 | qemu_vfree(acb->bounce); |
ce1a14dc | 1837 | acb->common.cb(acb->common.opaque, acb->ret); |
6a7ad299 | 1838 | qemu_bh_delete(acb->bh); |
36afc451 | 1839 | acb->bh = NULL; |
ce1a14dc | 1840 | qemu_aio_release(acb); |
83f64091 | 1841 | } |
beac80cd | 1842 | |
f141eafe AL |
1843 | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
1844 | int64_t sector_num, | |
1845 | QEMUIOVector *qiov, | |
1846 | int nb_sectors, | |
1847 | BlockDriverCompletionFunc *cb, | |
1848 | void *opaque, | |
1849 | int is_write) | |
1850 | ||
83f64091 | 1851 | { |
ce1a14dc | 1852 | BlockDriverAIOCBSync *acb; |
ce1a14dc | 1853 | |
c16b5a2c | 1854 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
f141eafe AL |
1855 | acb->is_write = is_write; |
1856 | acb->qiov = qiov; | |
e268ca52 | 1857 | acb->bounce = qemu_blockalign(bs, qiov->size); |
f141eafe | 1858 | |
ce1a14dc PB |
1859 | if (!acb->bh) |
1860 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
f141eafe AL |
1861 | |
1862 | if (is_write) { | |
1863 | qemu_iovec_to_buffer(acb->qiov, acb->bounce); | |
1864 | acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors); | |
1865 | } else { | |
1866 | acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors); | |
1867 | } | |
1868 | ||
ce1a14dc | 1869 | qemu_bh_schedule(acb->bh); |
f141eafe | 1870 | |
ce1a14dc | 1871 | return &acb->common; |
beac80cd FB |
1872 | } |
1873 | ||
f141eafe AL |
1874 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
1875 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 1876 | BlockDriverCompletionFunc *cb, void *opaque) |
beac80cd | 1877 | { |
f141eafe AL |
1878 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
1879 | } | |
83f64091 | 1880 | |
f141eafe AL |
1881 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
1882 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
1883 | BlockDriverCompletionFunc *cb, void *opaque) | |
1884 | { | |
1885 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); | |
beac80cd | 1886 | } |
beac80cd | 1887 | |
b2e12bc6 CH |
1888 | static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, |
1889 | BlockDriverCompletionFunc *cb, void *opaque) | |
1890 | { | |
1891 | BlockDriverAIOCBSync *acb; | |
1892 | ||
1893 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); | |
1894 | acb->is_write = 1; /* don't bounce in the completion hadler */ | |
1895 | acb->qiov = NULL; | |
1896 | acb->bounce = NULL; | |
1897 | acb->ret = 0; | |
1898 | ||
1899 | if (!acb->bh) | |
1900 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
1901 | ||
1902 | bdrv_flush(bs); | |
1903 | qemu_bh_schedule(acb->bh); | |
1904 | return &acb->common; | |
1905 | } | |
1906 | ||
83f64091 FB |
1907 | /**************************************************************/ |
1908 | /* sync block device emulation */ | |
ea2384d3 | 1909 | |
83f64091 FB |
1910 | static void bdrv_rw_em_cb(void *opaque, int ret) |
1911 | { | |
1912 | *(int *)opaque = ret; | |
ea2384d3 FB |
1913 | } |
1914 | ||
83f64091 FB |
1915 | #define NOT_DONE 0x7fffffff |
1916 | ||
5fafdf24 | 1917 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
83f64091 | 1918 | uint8_t *buf, int nb_sectors) |
7a6cba61 | 1919 | { |
ce1a14dc PB |
1920 | int async_ret; |
1921 | BlockDriverAIOCB *acb; | |
f141eafe AL |
1922 | struct iovec iov; |
1923 | QEMUIOVector qiov; | |
83f64091 | 1924 | |
65d6b3d8 KW |
1925 | async_context_push(); |
1926 | ||
83f64091 | 1927 | async_ret = NOT_DONE; |
3f4cb3d3 | 1928 | iov.iov_base = (void *)buf; |
f141eafe AL |
1929 | iov.iov_len = nb_sectors * 512; |
1930 | qemu_iovec_init_external(&qiov, &iov, 1); | |
1931 | acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors, | |
1932 | bdrv_rw_em_cb, &async_ret); | |
65d6b3d8 KW |
1933 | if (acb == NULL) { |
1934 | async_ret = -1; | |
1935 | goto fail; | |
1936 | } | |
baf35cb9 | 1937 | |
83f64091 FB |
1938 | while (async_ret == NOT_DONE) { |
1939 | qemu_aio_wait(); | |
1940 | } | |
baf35cb9 | 1941 | |
65d6b3d8 KW |
1942 | |
1943 | fail: | |
1944 | async_context_pop(); | |
83f64091 | 1945 | return async_ret; |
7a6cba61 PB |
1946 | } |
1947 | ||
83f64091 FB |
1948 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
1949 | const uint8_t *buf, int nb_sectors) | |
1950 | { | |
ce1a14dc PB |
1951 | int async_ret; |
1952 | BlockDriverAIOCB *acb; | |
f141eafe AL |
1953 | struct iovec iov; |
1954 | QEMUIOVector qiov; | |
83f64091 | 1955 | |
65d6b3d8 KW |
1956 | async_context_push(); |
1957 | ||
83f64091 | 1958 | async_ret = NOT_DONE; |
f141eafe AL |
1959 | iov.iov_base = (void *)buf; |
1960 | iov.iov_len = nb_sectors * 512; | |
1961 | qemu_iovec_init_external(&qiov, &iov, 1); | |
1962 | acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors, | |
1963 | bdrv_rw_em_cb, &async_ret); | |
65d6b3d8 KW |
1964 | if (acb == NULL) { |
1965 | async_ret = -1; | |
1966 | goto fail; | |
1967 | } | |
83f64091 FB |
1968 | while (async_ret == NOT_DONE) { |
1969 | qemu_aio_wait(); | |
1970 | } | |
65d6b3d8 KW |
1971 | |
1972 | fail: | |
1973 | async_context_pop(); | |
83f64091 FB |
1974 | return async_ret; |
1975 | } | |
ea2384d3 FB |
1976 | |
1977 | void bdrv_init(void) | |
1978 | { | |
5efa9d5a | 1979 | module_call_init(MODULE_INIT_BLOCK); |
ea2384d3 | 1980 | } |
ce1a14dc | 1981 | |
eb852011 MA |
1982 | void bdrv_init_with_whitelist(void) |
1983 | { | |
1984 | use_bdrv_whitelist = 1; | |
1985 | bdrv_init(); | |
1986 | } | |
1987 | ||
c16b5a2c CH |
1988 | void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs, |
1989 | BlockDriverCompletionFunc *cb, void *opaque) | |
ce1a14dc | 1990 | { |
ce1a14dc PB |
1991 | BlockDriverAIOCB *acb; |
1992 | ||
6bbff9a0 AL |
1993 | if (pool->free_aiocb) { |
1994 | acb = pool->free_aiocb; | |
1995 | pool->free_aiocb = acb->next; | |
ce1a14dc | 1996 | } else { |
6bbff9a0 AL |
1997 | acb = qemu_mallocz(pool->aiocb_size); |
1998 | acb->pool = pool; | |
ce1a14dc PB |
1999 | } |
2000 | acb->bs = bs; | |
2001 | acb->cb = cb; | |
2002 | acb->opaque = opaque; | |
2003 | return acb; | |
2004 | } | |
2005 | ||
2006 | void qemu_aio_release(void *p) | |
2007 | { | |
6bbff9a0 AL |
2008 | BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; |
2009 | AIOPool *pool = acb->pool; | |
2010 | acb->next = pool->free_aiocb; | |
2011 | pool->free_aiocb = acb; | |
ce1a14dc | 2012 | } |
19cb3738 FB |
2013 | |
2014 | /**************************************************************/ | |
2015 | /* removable device support */ | |
2016 | ||
2017 | /** | |
2018 | * Return TRUE if the media is present | |
2019 | */ | |
2020 | int bdrv_is_inserted(BlockDriverState *bs) | |
2021 | { | |
2022 | BlockDriver *drv = bs->drv; | |
2023 | int ret; | |
2024 | if (!drv) | |
2025 | return 0; | |
2026 | if (!drv->bdrv_is_inserted) | |
2027 | return 1; | |
2028 | ret = drv->bdrv_is_inserted(bs); | |
2029 | return ret; | |
2030 | } | |
2031 | ||
2032 | /** | |
2033 | * Return TRUE if the media changed since the last call to this | |
5fafdf24 | 2034 | * function. It is currently only used for floppy disks |
19cb3738 FB |
2035 | */ |
2036 | int bdrv_media_changed(BlockDriverState *bs) | |
2037 | { | |
2038 | BlockDriver *drv = bs->drv; | |
2039 | int ret; | |
2040 | ||
2041 | if (!drv || !drv->bdrv_media_changed) | |
2042 | ret = -ENOTSUP; | |
2043 | else | |
2044 | ret = drv->bdrv_media_changed(bs); | |
2045 | if (ret == -ENOTSUP) | |
2046 | ret = bs->media_changed; | |
2047 | bs->media_changed = 0; | |
2048 | return ret; | |
2049 | } | |
2050 | ||
2051 | /** | |
2052 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
2053 | */ | |
aea2a33c | 2054 | int bdrv_eject(BlockDriverState *bs, int eject_flag) |
19cb3738 FB |
2055 | { |
2056 | BlockDriver *drv = bs->drv; | |
2057 | int ret; | |
2058 | ||
aea2a33c MM |
2059 | if (bs->locked) { |
2060 | return -EBUSY; | |
2061 | } | |
2062 | ||
19cb3738 FB |
2063 | if (!drv || !drv->bdrv_eject) { |
2064 | ret = -ENOTSUP; | |
2065 | } else { | |
2066 | ret = drv->bdrv_eject(bs, eject_flag); | |
2067 | } | |
2068 | if (ret == -ENOTSUP) { | |
2069 | if (eject_flag) | |
2070 | bdrv_close(bs); | |
aea2a33c | 2071 | ret = 0; |
19cb3738 | 2072 | } |
aea2a33c MM |
2073 | |
2074 | return ret; | |
19cb3738 FB |
2075 | } |
2076 | ||
2077 | int bdrv_is_locked(BlockDriverState *bs) | |
2078 | { | |
2079 | return bs->locked; | |
2080 | } | |
2081 | ||
2082 | /** | |
2083 | * Lock or unlock the media (if it is locked, the user won't be able | |
2084 | * to eject it manually). | |
2085 | */ | |
2086 | void bdrv_set_locked(BlockDriverState *bs, int locked) | |
2087 | { | |
2088 | BlockDriver *drv = bs->drv; | |
2089 | ||
2090 | bs->locked = locked; | |
2091 | if (drv && drv->bdrv_set_locked) { | |
2092 | drv->bdrv_set_locked(bs, locked); | |
2093 | } | |
2094 | } | |
985a03b0 TS |
2095 | |
2096 | /* needed for generic scsi interface */ | |
2097 | ||
2098 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
2099 | { | |
2100 | BlockDriver *drv = bs->drv; | |
2101 | ||
2102 | if (drv && drv->bdrv_ioctl) | |
2103 | return drv->bdrv_ioctl(bs, req, buf); | |
2104 | return -ENOTSUP; | |
2105 | } | |
7d780669 | 2106 | |
221f715d AL |
2107 | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
2108 | unsigned long int req, void *buf, | |
2109 | BlockDriverCompletionFunc *cb, void *opaque) | |
7d780669 | 2110 | { |
221f715d | 2111 | BlockDriver *drv = bs->drv; |
7d780669 | 2112 | |
221f715d AL |
2113 | if (drv && drv->bdrv_aio_ioctl) |
2114 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); | |
2115 | return NULL; | |
7d780669 | 2116 | } |
e268ca52 | 2117 | |
7cd1e32a | 2118 | |
2119 | ||
e268ca52 AL |
2120 | void *qemu_blockalign(BlockDriverState *bs, size_t size) |
2121 | { | |
2122 | return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); | |
2123 | } | |
7cd1e32a | 2124 | |
2125 | void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable) | |
2126 | { | |
2127 | int64_t bitmap_size; | |
a55eb92c JK |
2128 | |
2129 | if (enable) { | |
c6d22830 JK |
2130 | if (!bs->dirty_bitmap) { |
2131 | bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) + | |
2132 | BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1; | |
2133 | bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8; | |
a55eb92c | 2134 | |
7cd1e32a | 2135 | bs->dirty_bitmap = qemu_mallocz(bitmap_size); |
a55eb92c | 2136 | } |
7cd1e32a | 2137 | } else { |
c6d22830 | 2138 | if (bs->dirty_bitmap) { |
7cd1e32a | 2139 | qemu_free(bs->dirty_bitmap); |
c6d22830 | 2140 | bs->dirty_bitmap = NULL; |
a55eb92c | 2141 | } |
7cd1e32a | 2142 | } |
2143 | } | |
2144 | ||
2145 | int bdrv_get_dirty(BlockDriverState *bs, int64_t sector) | |
2146 | { | |
6ea44308 | 2147 | int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; |
a55eb92c | 2148 | |
c6d22830 JK |
2149 | if (bs->dirty_bitmap && |
2150 | (sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) { | |
2151 | return bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] & | |
2152 | (1 << (chunk % (sizeof(unsigned long) * 8))); | |
7cd1e32a | 2153 | } else { |
2154 | return 0; | |
2155 | } | |
2156 | } | |
2157 | ||
a55eb92c JK |
2158 | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, |
2159 | int nr_sectors) | |
7cd1e32a | 2160 | { |
2161 | set_dirty_bitmap(bs, cur_sector, nr_sectors, 0); | |
2162 | } |