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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" |
71e72a19 | 25 | #ifdef CONFIG_BSD |
3990d09a BS |
26 | /* include native header before sys-queue.h */ |
27 | #include <sys/queue.h> | |
28 | #endif | |
29 | ||
faf07963 | 30 | #include "qemu-common.h" |
376253ec | 31 | #include "monitor.h" |
ea2384d3 | 32 | #include "block_int.h" |
5efa9d5a | 33 | #include "module.h" |
fc01f7e7 | 34 | |
71e72a19 | 35 | #ifdef CONFIG_BSD |
7674e7bf FB |
36 | #include <sys/types.h> |
37 | #include <sys/stat.h> | |
38 | #include <sys/ioctl.h> | |
c5e97233 | 39 | #ifndef __DragonFly__ |
7674e7bf FB |
40 | #include <sys/disk.h> |
41 | #endif | |
c5e97233 | 42 | #endif |
7674e7bf | 43 | |
49dc768d AL |
44 | #ifdef _WIN32 |
45 | #include <windows.h> | |
46 | #endif | |
47 | ||
83f64091 FB |
48 | #define SECTOR_BITS 9 |
49 | #define SECTOR_SIZE (1 << SECTOR_BITS) | |
50 | ||
f141eafe AL |
51 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
52 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
c87c0672 | 53 | BlockDriverCompletionFunc *cb, void *opaque); |
f141eafe AL |
54 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
55 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 56 | BlockDriverCompletionFunc *cb, void *opaque); |
b2e12bc6 CH |
57 | static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, |
58 | BlockDriverCompletionFunc *cb, void *opaque); | |
5fafdf24 | 59 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
83f64091 FB |
60 | uint8_t *buf, int nb_sectors); |
61 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, | |
62 | const uint8_t *buf, int nb_sectors); | |
ec530c81 | 63 | |
7ee930d0 BS |
64 | BlockDriverState *bdrv_first; |
65 | ||
ea2384d3 FB |
66 | static BlockDriver *first_drv; |
67 | ||
83f64091 | 68 | int path_is_absolute(const char *path) |
3b0d4f61 | 69 | { |
83f64091 | 70 | const char *p; |
21664424 FB |
71 | #ifdef _WIN32 |
72 | /* specific case for names like: "\\.\d:" */ | |
73 | if (*path == '/' || *path == '\\') | |
74 | return 1; | |
75 | #endif | |
83f64091 FB |
76 | p = strchr(path, ':'); |
77 | if (p) | |
78 | p++; | |
79 | else | |
80 | p = path; | |
3b9f94e1 FB |
81 | #ifdef _WIN32 |
82 | return (*p == '/' || *p == '\\'); | |
83 | #else | |
84 | return (*p == '/'); | |
85 | #endif | |
3b0d4f61 FB |
86 | } |
87 | ||
83f64091 FB |
88 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
89 | path to it by considering it is relative to base_path. URL are | |
90 | supported. */ | |
91 | void path_combine(char *dest, int dest_size, | |
92 | const char *base_path, | |
93 | const char *filename) | |
3b0d4f61 | 94 | { |
83f64091 FB |
95 | const char *p, *p1; |
96 | int len; | |
97 | ||
98 | if (dest_size <= 0) | |
99 | return; | |
100 | if (path_is_absolute(filename)) { | |
101 | pstrcpy(dest, dest_size, filename); | |
102 | } else { | |
103 | p = strchr(base_path, ':'); | |
104 | if (p) | |
105 | p++; | |
106 | else | |
107 | p = base_path; | |
3b9f94e1 FB |
108 | p1 = strrchr(base_path, '/'); |
109 | #ifdef _WIN32 | |
110 | { | |
111 | const char *p2; | |
112 | p2 = strrchr(base_path, '\\'); | |
113 | if (!p1 || p2 > p1) | |
114 | p1 = p2; | |
115 | } | |
116 | #endif | |
83f64091 FB |
117 | if (p1) |
118 | p1++; | |
119 | else | |
120 | p1 = base_path; | |
121 | if (p1 > p) | |
122 | p = p1; | |
123 | len = p - base_path; | |
124 | if (len > dest_size - 1) | |
125 | len = dest_size - 1; | |
126 | memcpy(dest, base_path, len); | |
127 | dest[len] = '\0'; | |
128 | pstrcat(dest, dest_size, filename); | |
3b0d4f61 | 129 | } |
3b0d4f61 FB |
130 | } |
131 | ||
5efa9d5a | 132 | void bdrv_register(BlockDriver *bdrv) |
ea2384d3 | 133 | { |
f141eafe | 134 | if (!bdrv->bdrv_aio_readv) { |
83f64091 | 135 | /* add AIO emulation layer */ |
f141eafe AL |
136 | bdrv->bdrv_aio_readv = bdrv_aio_readv_em; |
137 | bdrv->bdrv_aio_writev = bdrv_aio_writev_em; | |
eda578e5 | 138 | } else if (!bdrv->bdrv_read) { |
83f64091 FB |
139 | /* add synchronous IO emulation layer */ |
140 | bdrv->bdrv_read = bdrv_read_em; | |
141 | bdrv->bdrv_write = bdrv_write_em; | |
142 | } | |
b2e12bc6 CH |
143 | |
144 | if (!bdrv->bdrv_aio_flush) | |
145 | bdrv->bdrv_aio_flush = bdrv_aio_flush_em; | |
146 | ||
ea2384d3 FB |
147 | bdrv->next = first_drv; |
148 | first_drv = bdrv; | |
149 | } | |
b338082b FB |
150 | |
151 | /* create a new block device (by default it is empty) */ | |
152 | BlockDriverState *bdrv_new(const char *device_name) | |
153 | { | |
154 | BlockDriverState **pbs, *bs; | |
155 | ||
156 | bs = qemu_mallocz(sizeof(BlockDriverState)); | |
b338082b | 157 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); |
ea2384d3 FB |
158 | if (device_name[0] != '\0') { |
159 | /* insert at the end */ | |
160 | pbs = &bdrv_first; | |
161 | while (*pbs != NULL) | |
162 | pbs = &(*pbs)->next; | |
163 | *pbs = bs; | |
164 | } | |
b338082b FB |
165 | return bs; |
166 | } | |
167 | ||
ea2384d3 FB |
168 | BlockDriver *bdrv_find_format(const char *format_name) |
169 | { | |
170 | BlockDriver *drv1; | |
171 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { | |
172 | if (!strcmp(drv1->format_name, format_name)) | |
173 | return drv1; | |
174 | } | |
175 | return NULL; | |
176 | } | |
177 | ||
0e7e1989 KW |
178 | int bdrv_create(BlockDriver *drv, const char* filename, |
179 | QEMUOptionParameter *options) | |
ea2384d3 FB |
180 | { |
181 | if (!drv->bdrv_create) | |
182 | return -ENOTSUP; | |
0e7e1989 KW |
183 | |
184 | return drv->bdrv_create(filename, options); | |
ea2384d3 FB |
185 | } |
186 | ||
d5249393 | 187 | #ifdef _WIN32 |
95389c86 | 188 | void get_tmp_filename(char *filename, int size) |
d5249393 | 189 | { |
3b9f94e1 | 190 | char temp_dir[MAX_PATH]; |
3b46e624 | 191 | |
3b9f94e1 FB |
192 | GetTempPath(MAX_PATH, temp_dir); |
193 | GetTempFileName(temp_dir, "qem", 0, filename); | |
d5249393 FB |
194 | } |
195 | #else | |
95389c86 | 196 | void get_tmp_filename(char *filename, int size) |
fc01f7e7 | 197 | { |
67b915a5 | 198 | int fd; |
7ccfb2eb | 199 | const char *tmpdir; |
d5249393 | 200 | /* XXX: race condition possible */ |
0badc1ee AJ |
201 | tmpdir = getenv("TMPDIR"); |
202 | if (!tmpdir) | |
203 | tmpdir = "/tmp"; | |
204 | snprintf(filename, size, "%s/vl.XXXXXX", tmpdir); | |
ea2384d3 FB |
205 | fd = mkstemp(filename); |
206 | close(fd); | |
207 | } | |
d5249393 | 208 | #endif |
fc01f7e7 | 209 | |
19cb3738 | 210 | #ifdef _WIN32 |
f45512fe FB |
211 | static int is_windows_drive_prefix(const char *filename) |
212 | { | |
213 | return (((filename[0] >= 'a' && filename[0] <= 'z') || | |
214 | (filename[0] >= 'A' && filename[0] <= 'Z')) && | |
215 | filename[1] == ':'); | |
216 | } | |
3b46e624 | 217 | |
508c7cb3 | 218 | int is_windows_drive(const char *filename) |
19cb3738 | 219 | { |
5fafdf24 | 220 | if (is_windows_drive_prefix(filename) && |
f45512fe | 221 | filename[2] == '\0') |
19cb3738 FB |
222 | return 1; |
223 | if (strstart(filename, "\\\\.\\", NULL) || | |
224 | strstart(filename, "//./", NULL)) | |
225 | return 1; | |
226 | return 0; | |
227 | } | |
228 | #endif | |
229 | ||
83f64091 FB |
230 | static BlockDriver *find_protocol(const char *filename) |
231 | { | |
232 | BlockDriver *drv1; | |
233 | char protocol[128]; | |
1cec71e3 | 234 | int len; |
83f64091 | 235 | const char *p; |
19cb3738 FB |
236 | |
237 | #ifdef _WIN32 | |
f45512fe FB |
238 | if (is_windows_drive(filename) || |
239 | is_windows_drive_prefix(filename)) | |
5efa9d5a | 240 | return bdrv_find_format("raw"); |
19cb3738 | 241 | #endif |
1cec71e3 AL |
242 | p = strchr(filename, ':'); |
243 | if (!p) | |
5efa9d5a | 244 | return bdrv_find_format("raw"); |
1cec71e3 AL |
245 | len = p - filename; |
246 | if (len > sizeof(protocol) - 1) | |
247 | len = sizeof(protocol) - 1; | |
248 | memcpy(protocol, filename, len); | |
249 | protocol[len] = '\0'; | |
83f64091 | 250 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
5fafdf24 | 251 | if (drv1->protocol_name && |
83f64091 FB |
252 | !strcmp(drv1->protocol_name, protocol)) |
253 | return drv1; | |
254 | } | |
255 | return NULL; | |
256 | } | |
257 | ||
f3a5d3f8 CH |
258 | /* |
259 | * Detect host devices. By convention, /dev/cdrom[N] is always | |
260 | * recognized as a host CDROM. | |
261 | */ | |
f3a5d3f8 CH |
262 | static BlockDriver *find_hdev_driver(const char *filename) |
263 | { | |
508c7cb3 CH |
264 | int score_max = 0, score; |
265 | BlockDriver *drv = NULL, *d; | |
f3a5d3f8 | 266 | |
508c7cb3 CH |
267 | for (d = first_drv; d; d = d->next) { |
268 | if (d->bdrv_probe_device) { | |
269 | score = d->bdrv_probe_device(filename); | |
270 | if (score > score_max) { | |
271 | score_max = score; | |
272 | drv = d; | |
273 | } | |
274 | } | |
19cb3738 | 275 | } |
f3a5d3f8 | 276 | |
508c7cb3 | 277 | return drv; |
f3a5d3f8 | 278 | } |
3b46e624 | 279 | |
f3a5d3f8 CH |
280 | static BlockDriver *find_image_format(const char *filename) |
281 | { | |
282 | int ret, score, score_max; | |
283 | BlockDriver *drv1, *drv; | |
284 | uint8_t buf[2048]; | |
285 | BlockDriverState *bs; | |
286 | ||
83f64091 | 287 | drv = find_protocol(filename); |
19cb3738 | 288 | /* no need to test disk image formats for vvfat */ |
c833ab73 | 289 | if (drv && strcmp(drv->format_name, "vvfat") == 0) |
83f64091 | 290 | return drv; |
19cb3738 | 291 | |
83f64091 FB |
292 | ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY); |
293 | if (ret < 0) | |
294 | return NULL; | |
295 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); | |
296 | bdrv_delete(bs); | |
297 | if (ret < 0) { | |
298 | return NULL; | |
299 | } | |
300 | ||
ea2384d3 FB |
301 | score_max = 0; |
302 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { | |
83f64091 FB |
303 | if (drv1->bdrv_probe) { |
304 | score = drv1->bdrv_probe(buf, ret, filename); | |
305 | if (score > score_max) { | |
306 | score_max = score; | |
307 | drv = drv1; | |
308 | } | |
0849bf08 | 309 | } |
fc01f7e7 | 310 | } |
ea2384d3 FB |
311 | return drv; |
312 | } | |
313 | ||
83f64091 | 314 | int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
ea2384d3 | 315 | { |
83f64091 FB |
316 | BlockDriverState *bs; |
317 | int ret; | |
318 | ||
319 | bs = bdrv_new(""); | |
83f64091 FB |
320 | ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL); |
321 | if (ret < 0) { | |
322 | bdrv_delete(bs); | |
323 | return ret; | |
3b0d4f61 | 324 | } |
71d0770c | 325 | bs->growable = 1; |
83f64091 FB |
326 | *pbs = bs; |
327 | return 0; | |
328 | } | |
329 | ||
330 | int bdrv_open(BlockDriverState *bs, const char *filename, int flags) | |
331 | { | |
332 | return bdrv_open2(bs, filename, flags, NULL); | |
ea2384d3 FB |
333 | } |
334 | ||
83f64091 | 335 | int bdrv_open2(BlockDriverState *bs, const char *filename, int flags, |
ea2384d3 FB |
336 | BlockDriver *drv) |
337 | { | |
83f64091 | 338 | int ret, open_flags; |
eb5c851f TS |
339 | char tmp_filename[PATH_MAX]; |
340 | char backing_filename[PATH_MAX]; | |
3b46e624 | 341 | |
ea2384d3 FB |
342 | bs->read_only = 0; |
343 | bs->is_temporary = 0; | |
344 | bs->encrypted = 0; | |
c0f4ce77 | 345 | bs->valid_key = 0; |
e268ca52 AL |
346 | /* buffer_alignment defaulted to 512, drivers can change this value */ |
347 | bs->buffer_alignment = 512; | |
712e7874 | 348 | |
83f64091 | 349 | if (flags & BDRV_O_SNAPSHOT) { |
ea2384d3 FB |
350 | BlockDriverState *bs1; |
351 | int64_t total_size; | |
7c96d46e | 352 | int is_protocol = 0; |
91a073a9 KW |
353 | BlockDriver *bdrv_qcow2; |
354 | QEMUOptionParameter *options; | |
3b46e624 | 355 | |
ea2384d3 FB |
356 | /* if snapshot, we create a temporary backing file and open it |
357 | instead of opening 'filename' directly */ | |
33e3963e | 358 | |
ea2384d3 FB |
359 | /* if there is a backing file, use it */ |
360 | bs1 = bdrv_new(""); | |
5eb45639 | 361 | ret = bdrv_open2(bs1, filename, 0, drv); |
51d7c00c | 362 | if (ret < 0) { |
ea2384d3 | 363 | bdrv_delete(bs1); |
51d7c00c | 364 | return ret; |
ea2384d3 | 365 | } |
83f64091 | 366 | total_size = bdrv_getlength(bs1) >> SECTOR_BITS; |
7c96d46e AL |
367 | |
368 | if (bs1->drv && bs1->drv->protocol_name) | |
369 | is_protocol = 1; | |
370 | ||
ea2384d3 | 371 | bdrv_delete(bs1); |
3b46e624 | 372 | |
ea2384d3 | 373 | get_tmp_filename(tmp_filename, sizeof(tmp_filename)); |
7c96d46e AL |
374 | |
375 | /* Real path is meaningless for protocols */ | |
376 | if (is_protocol) | |
377 | snprintf(backing_filename, sizeof(backing_filename), | |
378 | "%s", filename); | |
379 | else | |
380 | realpath(filename, backing_filename); | |
381 | ||
91a073a9 KW |
382 | bdrv_qcow2 = bdrv_find_format("qcow2"); |
383 | options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); | |
384 | ||
385 | set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size * 512); | |
386 | set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); | |
387 | if (drv) { | |
388 | set_option_parameter(options, BLOCK_OPT_BACKING_FMT, | |
389 | drv->format_name); | |
390 | } | |
391 | ||
392 | ret = bdrv_create(bdrv_qcow2, tmp_filename, options); | |
51d7c00c AL |
393 | if (ret < 0) { |
394 | return ret; | |
ea2384d3 | 395 | } |
91a073a9 | 396 | |
ea2384d3 | 397 | filename = tmp_filename; |
91a073a9 | 398 | drv = bdrv_qcow2; |
ea2384d3 FB |
399 | bs->is_temporary = 1; |
400 | } | |
712e7874 | 401 | |
ea2384d3 | 402 | pstrcpy(bs->filename, sizeof(bs->filename), filename); |
83f64091 FB |
403 | if (flags & BDRV_O_FILE) { |
404 | drv = find_protocol(filename); | |
51d7c00c | 405 | } else if (!drv) { |
f3a5d3f8 CH |
406 | drv = find_hdev_driver(filename); |
407 | if (!drv) { | |
408 | drv = find_image_format(filename); | |
409 | } | |
51d7c00c AL |
410 | } |
411 | if (!drv) { | |
412 | ret = -ENOENT; | |
413 | goto unlink_and_fail; | |
ea2384d3 FB |
414 | } |
415 | bs->drv = drv; | |
416 | bs->opaque = qemu_mallocz(drv->instance_size); | |
e900a7b7 CH |
417 | |
418 | /* | |
419 | * Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a | |
420 | * write cache to the guest. We do need the fdatasync to flush | |
421 | * out transactions for block allocations, and we maybe have a | |
422 | * volatile write cache in our backing device to deal with. | |
423 | */ | |
424 | if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE)) | |
425 | bs->enable_write_cache = 1; | |
426 | ||
83f64091 FB |
427 | /* Note: for compatibility, we open disk image files as RDWR, and |
428 | RDONLY as fallback */ | |
429 | if (!(flags & BDRV_O_FILE)) | |
5c6c3a6c CH |
430 | open_flags = BDRV_O_RDWR | |
431 | (flags & (BDRV_O_CACHE_MASK|BDRV_O_NATIVE_AIO)); | |
83f64091 FB |
432 | else |
433 | open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT); | |
1cec71e3 | 434 | ret = drv->bdrv_open(bs, filename, open_flags); |
a0a83536 | 435 | if ((ret == -EACCES || ret == -EPERM) && !(flags & BDRV_O_FILE)) { |
1cec71e3 | 436 | ret = drv->bdrv_open(bs, filename, open_flags & ~BDRV_O_RDWR); |
83f64091 FB |
437 | bs->read_only = 1; |
438 | } | |
ea2384d3 FB |
439 | if (ret < 0) { |
440 | qemu_free(bs->opaque); | |
6b21b973 FB |
441 | bs->opaque = NULL; |
442 | bs->drv = NULL; | |
51d7c00c AL |
443 | unlink_and_fail: |
444 | if (bs->is_temporary) | |
445 | unlink(filename); | |
83f64091 | 446 | return ret; |
33e3963e | 447 | } |
d15a771d FB |
448 | if (drv->bdrv_getlength) { |
449 | bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; | |
450 | } | |
67b915a5 | 451 | #ifndef _WIN32 |
ea2384d3 FB |
452 | if (bs->is_temporary) { |
453 | unlink(filename); | |
454 | } | |
455 | #endif | |
83f64091 | 456 | if (bs->backing_file[0] != '\0') { |
ea2384d3 | 457 | /* if there is a backing file, use it */ |
5eb45639 | 458 | BlockDriver *back_drv = NULL; |
ea2384d3 | 459 | bs->backing_hd = bdrv_new(""); |
83f64091 FB |
460 | path_combine(backing_filename, sizeof(backing_filename), |
461 | filename, bs->backing_file); | |
5eb45639 AL |
462 | if (bs->backing_format[0] != '\0') |
463 | back_drv = bdrv_find_format(bs->backing_format); | |
464 | ret = bdrv_open2(bs->backing_hd, backing_filename, open_flags, | |
465 | back_drv); | |
51d7c00c AL |
466 | if (ret < 0) { |
467 | bdrv_close(bs); | |
468 | return ret; | |
469 | } | |
33e3963e FB |
470 | } |
471 | ||
bb5fc20f AL |
472 | if (!bdrv_key_required(bs)) { |
473 | /* call the change callback */ | |
474 | bs->media_changed = 1; | |
475 | if (bs->change_cb) | |
476 | bs->change_cb(bs->change_opaque); | |
477 | } | |
b338082b | 478 | return 0; |
fc01f7e7 FB |
479 | } |
480 | ||
481 | void bdrv_close(BlockDriverState *bs) | |
482 | { | |
19cb3738 | 483 | if (bs->drv) { |
ea2384d3 FB |
484 | if (bs->backing_hd) |
485 | bdrv_delete(bs->backing_hd); | |
486 | bs->drv->bdrv_close(bs); | |
487 | qemu_free(bs->opaque); | |
488 | #ifdef _WIN32 | |
489 | if (bs->is_temporary) { | |
490 | unlink(bs->filename); | |
491 | } | |
67b915a5 | 492 | #endif |
ea2384d3 FB |
493 | bs->opaque = NULL; |
494 | bs->drv = NULL; | |
b338082b FB |
495 | |
496 | /* call the change callback */ | |
19cb3738 | 497 | bs->media_changed = 1; |
b338082b FB |
498 | if (bs->change_cb) |
499 | bs->change_cb(bs->change_opaque); | |
500 | } | |
501 | } | |
502 | ||
503 | void bdrv_delete(BlockDriverState *bs) | |
504 | { | |
34c6f050 AJ |
505 | BlockDriverState **pbs; |
506 | ||
507 | pbs = &bdrv_first; | |
508 | while (*pbs != bs && *pbs != NULL) | |
509 | pbs = &(*pbs)->next; | |
510 | if (*pbs == bs) | |
511 | *pbs = bs->next; | |
512 | ||
b338082b FB |
513 | bdrv_close(bs); |
514 | qemu_free(bs); | |
fc01f7e7 FB |
515 | } |
516 | ||
e97fc193 AL |
517 | /* |
518 | * Run consistency checks on an image | |
519 | * | |
520 | * Returns the number of errors or -errno when an internal error occurs | |
521 | */ | |
522 | int bdrv_check(BlockDriverState *bs) | |
523 | { | |
524 | if (bs->drv->bdrv_check == NULL) { | |
525 | return -ENOTSUP; | |
526 | } | |
527 | ||
528 | return bs->drv->bdrv_check(bs); | |
529 | } | |
530 | ||
33e3963e FB |
531 | /* commit COW file into the raw image */ |
532 | int bdrv_commit(BlockDriverState *bs) | |
533 | { | |
19cb3738 | 534 | BlockDriver *drv = bs->drv; |
83f64091 | 535 | int64_t i, total_sectors; |
ea2384d3 FB |
536 | int n, j; |
537 | unsigned char sector[512]; | |
33e3963e | 538 | |
19cb3738 FB |
539 | if (!drv) |
540 | return -ENOMEDIUM; | |
33e3963e FB |
541 | |
542 | if (bs->read_only) { | |
ea2384d3 | 543 | return -EACCES; |
33e3963e FB |
544 | } |
545 | ||
ea2384d3 FB |
546 | if (!bs->backing_hd) { |
547 | return -ENOTSUP; | |
548 | } | |
33e3963e | 549 | |
83f64091 FB |
550 | total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
551 | for (i = 0; i < total_sectors;) { | |
19cb3738 | 552 | if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { |
ea2384d3 FB |
553 | for(j = 0; j < n; j++) { |
554 | if (bdrv_read(bs, i, sector, 1) != 0) { | |
555 | return -EIO; | |
556 | } | |
557 | ||
558 | if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { | |
559 | return -EIO; | |
560 | } | |
561 | i++; | |
33e3963e | 562 | } |
ea2384d3 FB |
563 | } else { |
564 | i += n; | |
565 | } | |
33e3963e | 566 | } |
95389c86 | 567 | |
19cb3738 FB |
568 | if (drv->bdrv_make_empty) |
569 | return drv->bdrv_make_empty(bs); | |
95389c86 | 570 | |
33e3963e FB |
571 | return 0; |
572 | } | |
573 | ||
71d0770c AL |
574 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
575 | size_t size) | |
576 | { | |
577 | int64_t len; | |
578 | ||
579 | if (!bdrv_is_inserted(bs)) | |
580 | return -ENOMEDIUM; | |
581 | ||
582 | if (bs->growable) | |
583 | return 0; | |
584 | ||
585 | len = bdrv_getlength(bs); | |
586 | ||
fbb7b4e0 KW |
587 | if (offset < 0) |
588 | return -EIO; | |
589 | ||
590 | if ((offset > len) || (len - offset < size)) | |
71d0770c AL |
591 | return -EIO; |
592 | ||
593 | return 0; | |
594 | } | |
595 | ||
596 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, | |
597 | int nb_sectors) | |
598 | { | |
999dec57 | 599 | return bdrv_check_byte_request(bs, sector_num * 512, nb_sectors * 512); |
71d0770c AL |
600 | } |
601 | ||
19cb3738 | 602 | /* return < 0 if error. See bdrv_write() for the return codes */ |
5fafdf24 | 603 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
604 | uint8_t *buf, int nb_sectors) |
605 | { | |
ea2384d3 FB |
606 | BlockDriver *drv = bs->drv; |
607 | ||
19cb3738 FB |
608 | if (!drv) |
609 | return -ENOMEDIUM; | |
71d0770c AL |
610 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
611 | return -EIO; | |
b338082b | 612 | |
eda578e5 | 613 | return drv->bdrv_read(bs, sector_num, buf, nb_sectors); |
fc01f7e7 FB |
614 | } |
615 | ||
5fafdf24 | 616 | /* Return < 0 if error. Important errors are: |
19cb3738 FB |
617 | -EIO generic I/O error (may happen for all errors) |
618 | -ENOMEDIUM No media inserted. | |
619 | -EINVAL Invalid sector number or nb_sectors | |
620 | -EACCES Trying to write a read-only device | |
621 | */ | |
5fafdf24 | 622 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
623 | const uint8_t *buf, int nb_sectors) |
624 | { | |
83f64091 | 625 | BlockDriver *drv = bs->drv; |
19cb3738 FB |
626 | if (!bs->drv) |
627 | return -ENOMEDIUM; | |
0849bf08 | 628 | if (bs->read_only) |
19cb3738 | 629 | return -EACCES; |
71d0770c AL |
630 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
631 | return -EIO; | |
632 | ||
42fb2807 | 633 | return drv->bdrv_write(bs, sector_num, buf, nb_sectors); |
83f64091 FB |
634 | } |
635 | ||
eda578e5 AL |
636 | int bdrv_pread(BlockDriverState *bs, int64_t offset, |
637 | void *buf, int count1) | |
83f64091 | 638 | { |
83f64091 FB |
639 | uint8_t tmp_buf[SECTOR_SIZE]; |
640 | int len, nb_sectors, count; | |
641 | int64_t sector_num; | |
642 | ||
643 | count = count1; | |
644 | /* first read to align to sector start */ | |
645 | len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1); | |
646 | if (len > count) | |
647 | len = count; | |
648 | sector_num = offset >> SECTOR_BITS; | |
649 | if (len > 0) { | |
650 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
651 | return -EIO; | |
652 | memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len); | |
653 | count -= len; | |
654 | if (count == 0) | |
655 | return count1; | |
656 | sector_num++; | |
657 | buf += len; | |
658 | } | |
659 | ||
660 | /* read the sectors "in place" */ | |
661 | nb_sectors = count >> SECTOR_BITS; | |
662 | if (nb_sectors > 0) { | |
663 | if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0) | |
664 | return -EIO; | |
665 | sector_num += nb_sectors; | |
666 | len = nb_sectors << SECTOR_BITS; | |
667 | buf += len; | |
668 | count -= len; | |
669 | } | |
670 | ||
671 | /* add data from the last sector */ | |
672 | if (count > 0) { | |
673 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
674 | return -EIO; | |
675 | memcpy(buf, tmp_buf, count); | |
676 | } | |
677 | return count1; | |
678 | } | |
679 | ||
eda578e5 AL |
680 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, |
681 | const void *buf, int count1) | |
83f64091 | 682 | { |
83f64091 FB |
683 | uint8_t tmp_buf[SECTOR_SIZE]; |
684 | int len, nb_sectors, count; | |
685 | int64_t sector_num; | |
686 | ||
687 | count = count1; | |
688 | /* first write to align to sector start */ | |
689 | len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1); | |
690 | if (len > count) | |
691 | len = count; | |
692 | sector_num = offset >> SECTOR_BITS; | |
693 | if (len > 0) { | |
694 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
695 | return -EIO; | |
696 | memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len); | |
697 | if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) | |
698 | return -EIO; | |
699 | count -= len; | |
700 | if (count == 0) | |
701 | return count1; | |
702 | sector_num++; | |
703 | buf += len; | |
704 | } | |
705 | ||
706 | /* write the sectors "in place" */ | |
707 | nb_sectors = count >> SECTOR_BITS; | |
708 | if (nb_sectors > 0) { | |
709 | if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0) | |
710 | return -EIO; | |
711 | sector_num += nb_sectors; | |
712 | len = nb_sectors << SECTOR_BITS; | |
713 | buf += len; | |
714 | count -= len; | |
715 | } | |
716 | ||
717 | /* add data from the last sector */ | |
718 | if (count > 0) { | |
719 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
720 | return -EIO; | |
721 | memcpy(tmp_buf, buf, count); | |
722 | if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) | |
723 | return -EIO; | |
724 | } | |
725 | return count1; | |
726 | } | |
83f64091 | 727 | |
83f64091 FB |
728 | /** |
729 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
730 | */ | |
731 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
732 | { | |
733 | BlockDriver *drv = bs->drv; | |
734 | if (!drv) | |
19cb3738 | 735 | return -ENOMEDIUM; |
83f64091 FB |
736 | if (!drv->bdrv_truncate) |
737 | return -ENOTSUP; | |
738 | return drv->bdrv_truncate(bs, offset); | |
739 | } | |
740 | ||
741 | /** | |
742 | * Length of a file in bytes. Return < 0 if error or unknown. | |
743 | */ | |
744 | int64_t bdrv_getlength(BlockDriverState *bs) | |
745 | { | |
746 | BlockDriver *drv = bs->drv; | |
747 | if (!drv) | |
19cb3738 | 748 | return -ENOMEDIUM; |
83f64091 FB |
749 | if (!drv->bdrv_getlength) { |
750 | /* legacy mode */ | |
751 | return bs->total_sectors * SECTOR_SIZE; | |
752 | } | |
753 | return drv->bdrv_getlength(bs); | |
fc01f7e7 FB |
754 | } |
755 | ||
19cb3738 | 756 | /* return 0 as number of sectors if no device present or error */ |
96b8f136 | 757 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
fc01f7e7 | 758 | { |
19cb3738 FB |
759 | int64_t length; |
760 | length = bdrv_getlength(bs); | |
761 | if (length < 0) | |
762 | length = 0; | |
763 | else | |
764 | length = length >> SECTOR_BITS; | |
765 | *nb_sectors_ptr = length; | |
fc01f7e7 | 766 | } |
cf98951b | 767 | |
f3d54fc4 AL |
768 | struct partition { |
769 | uint8_t boot_ind; /* 0x80 - active */ | |
770 | uint8_t head; /* starting head */ | |
771 | uint8_t sector; /* starting sector */ | |
772 | uint8_t cyl; /* starting cylinder */ | |
773 | uint8_t sys_ind; /* What partition type */ | |
774 | uint8_t end_head; /* end head */ | |
775 | uint8_t end_sector; /* end sector */ | |
776 | uint8_t end_cyl; /* end cylinder */ | |
777 | uint32_t start_sect; /* starting sector counting from 0 */ | |
778 | uint32_t nr_sects; /* nr of sectors in partition */ | |
779 | } __attribute__((packed)); | |
780 | ||
781 | /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */ | |
782 | static int guess_disk_lchs(BlockDriverState *bs, | |
783 | int *pcylinders, int *pheads, int *psectors) | |
784 | { | |
785 | uint8_t buf[512]; | |
786 | int ret, i, heads, sectors, cylinders; | |
787 | struct partition *p; | |
788 | uint32_t nr_sects; | |
a38131b6 | 789 | uint64_t nb_sectors; |
f3d54fc4 AL |
790 | |
791 | bdrv_get_geometry(bs, &nb_sectors); | |
792 | ||
793 | ret = bdrv_read(bs, 0, buf, 1); | |
794 | if (ret < 0) | |
795 | return -1; | |
796 | /* test msdos magic */ | |
797 | if (buf[510] != 0x55 || buf[511] != 0xaa) | |
798 | return -1; | |
799 | for(i = 0; i < 4; i++) { | |
800 | p = ((struct partition *)(buf + 0x1be)) + i; | |
801 | nr_sects = le32_to_cpu(p->nr_sects); | |
802 | if (nr_sects && p->end_head) { | |
803 | /* We make the assumption that the partition terminates on | |
804 | a cylinder boundary */ | |
805 | heads = p->end_head + 1; | |
806 | sectors = p->end_sector & 63; | |
807 | if (sectors == 0) | |
808 | continue; | |
809 | cylinders = nb_sectors / (heads * sectors); | |
810 | if (cylinders < 1 || cylinders > 16383) | |
811 | continue; | |
812 | *pheads = heads; | |
813 | *psectors = sectors; | |
814 | *pcylinders = cylinders; | |
815 | #if 0 | |
816 | printf("guessed geometry: LCHS=%d %d %d\n", | |
817 | cylinders, heads, sectors); | |
818 | #endif | |
819 | return 0; | |
820 | } | |
821 | } | |
822 | return -1; | |
823 | } | |
824 | ||
825 | void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) | |
826 | { | |
827 | int translation, lba_detected = 0; | |
828 | int cylinders, heads, secs; | |
a38131b6 | 829 | uint64_t nb_sectors; |
f3d54fc4 AL |
830 | |
831 | /* if a geometry hint is available, use it */ | |
832 | bdrv_get_geometry(bs, &nb_sectors); | |
833 | bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); | |
834 | translation = bdrv_get_translation_hint(bs); | |
835 | if (cylinders != 0) { | |
836 | *pcyls = cylinders; | |
837 | *pheads = heads; | |
838 | *psecs = secs; | |
839 | } else { | |
840 | if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { | |
841 | if (heads > 16) { | |
842 | /* if heads > 16, it means that a BIOS LBA | |
843 | translation was active, so the default | |
844 | hardware geometry is OK */ | |
845 | lba_detected = 1; | |
846 | goto default_geometry; | |
847 | } else { | |
848 | *pcyls = cylinders; | |
849 | *pheads = heads; | |
850 | *psecs = secs; | |
851 | /* disable any translation to be in sync with | |
852 | the logical geometry */ | |
853 | if (translation == BIOS_ATA_TRANSLATION_AUTO) { | |
854 | bdrv_set_translation_hint(bs, | |
855 | BIOS_ATA_TRANSLATION_NONE); | |
856 | } | |
857 | } | |
858 | } else { | |
859 | default_geometry: | |
860 | /* if no geometry, use a standard physical disk geometry */ | |
861 | cylinders = nb_sectors / (16 * 63); | |
862 | ||
863 | if (cylinders > 16383) | |
864 | cylinders = 16383; | |
865 | else if (cylinders < 2) | |
866 | cylinders = 2; | |
867 | *pcyls = cylinders; | |
868 | *pheads = 16; | |
869 | *psecs = 63; | |
870 | if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { | |
871 | if ((*pcyls * *pheads) <= 131072) { | |
872 | bdrv_set_translation_hint(bs, | |
873 | BIOS_ATA_TRANSLATION_LARGE); | |
874 | } else { | |
875 | bdrv_set_translation_hint(bs, | |
876 | BIOS_ATA_TRANSLATION_LBA); | |
877 | } | |
878 | } | |
879 | } | |
880 | bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); | |
881 | } | |
882 | } | |
883 | ||
5fafdf24 | 884 | void bdrv_set_geometry_hint(BlockDriverState *bs, |
b338082b FB |
885 | int cyls, int heads, int secs) |
886 | { | |
887 | bs->cyls = cyls; | |
888 | bs->heads = heads; | |
889 | bs->secs = secs; | |
890 | } | |
891 | ||
892 | void bdrv_set_type_hint(BlockDriverState *bs, int type) | |
893 | { | |
894 | bs->type = type; | |
895 | bs->removable = ((type == BDRV_TYPE_CDROM || | |
896 | type == BDRV_TYPE_FLOPPY)); | |
897 | } | |
898 | ||
46d4767d FB |
899 | void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
900 | { | |
901 | bs->translation = translation; | |
902 | } | |
903 | ||
5fafdf24 | 904 | void bdrv_get_geometry_hint(BlockDriverState *bs, |
b338082b FB |
905 | int *pcyls, int *pheads, int *psecs) |
906 | { | |
907 | *pcyls = bs->cyls; | |
908 | *pheads = bs->heads; | |
909 | *psecs = bs->secs; | |
910 | } | |
911 | ||
912 | int bdrv_get_type_hint(BlockDriverState *bs) | |
913 | { | |
914 | return bs->type; | |
915 | } | |
916 | ||
46d4767d FB |
917 | int bdrv_get_translation_hint(BlockDriverState *bs) |
918 | { | |
919 | return bs->translation; | |
920 | } | |
921 | ||
b338082b FB |
922 | int bdrv_is_removable(BlockDriverState *bs) |
923 | { | |
924 | return bs->removable; | |
925 | } | |
926 | ||
927 | int bdrv_is_read_only(BlockDriverState *bs) | |
928 | { | |
929 | return bs->read_only; | |
930 | } | |
931 | ||
985a03b0 TS |
932 | int bdrv_is_sg(BlockDriverState *bs) |
933 | { | |
934 | return bs->sg; | |
935 | } | |
936 | ||
e900a7b7 CH |
937 | int bdrv_enable_write_cache(BlockDriverState *bs) |
938 | { | |
939 | return bs->enable_write_cache; | |
940 | } | |
941 | ||
19cb3738 | 942 | /* XXX: no longer used */ |
5fafdf24 | 943 | void bdrv_set_change_cb(BlockDriverState *bs, |
b338082b FB |
944 | void (*change_cb)(void *opaque), void *opaque) |
945 | { | |
946 | bs->change_cb = change_cb; | |
947 | bs->change_opaque = opaque; | |
948 | } | |
949 | ||
ea2384d3 FB |
950 | int bdrv_is_encrypted(BlockDriverState *bs) |
951 | { | |
952 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
953 | return 1; | |
954 | return bs->encrypted; | |
955 | } | |
956 | ||
c0f4ce77 AL |
957 | int bdrv_key_required(BlockDriverState *bs) |
958 | { | |
959 | BlockDriverState *backing_hd = bs->backing_hd; | |
960 | ||
961 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) | |
962 | return 1; | |
963 | return (bs->encrypted && !bs->valid_key); | |
964 | } | |
965 | ||
ea2384d3 FB |
966 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
967 | { | |
968 | int ret; | |
969 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
970 | ret = bdrv_set_key(bs->backing_hd, key); | |
971 | if (ret < 0) | |
972 | return ret; | |
973 | if (!bs->encrypted) | |
974 | return 0; | |
975 | } | |
976 | if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key) | |
977 | return -1; | |
c0f4ce77 | 978 | ret = bs->drv->bdrv_set_key(bs, key); |
bb5fc20f AL |
979 | if (ret < 0) { |
980 | bs->valid_key = 0; | |
981 | } else if (!bs->valid_key) { | |
982 | bs->valid_key = 1; | |
983 | /* call the change callback now, we skipped it on open */ | |
984 | bs->media_changed = 1; | |
985 | if (bs->change_cb) | |
986 | bs->change_cb(bs->change_opaque); | |
987 | } | |
c0f4ce77 | 988 | return ret; |
ea2384d3 FB |
989 | } |
990 | ||
991 | void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) | |
992 | { | |
19cb3738 | 993 | if (!bs->drv) { |
ea2384d3 FB |
994 | buf[0] = '\0'; |
995 | } else { | |
996 | pstrcpy(buf, buf_size, bs->drv->format_name); | |
997 | } | |
998 | } | |
999 | ||
5fafdf24 | 1000 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
ea2384d3 FB |
1001 | void *opaque) |
1002 | { | |
1003 | BlockDriver *drv; | |
1004 | ||
1005 | for (drv = first_drv; drv != NULL; drv = drv->next) { | |
1006 | it(opaque, drv->format_name); | |
1007 | } | |
1008 | } | |
1009 | ||
b338082b FB |
1010 | BlockDriverState *bdrv_find(const char *name) |
1011 | { | |
1012 | BlockDriverState *bs; | |
1013 | ||
1014 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
1015 | if (!strcmp(name, bs->device_name)) | |
1016 | return bs; | |
1017 | } | |
1018 | return NULL; | |
1019 | } | |
1020 | ||
51de9760 | 1021 | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
81d0912d FB |
1022 | { |
1023 | BlockDriverState *bs; | |
1024 | ||
1025 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
51de9760 | 1026 | it(opaque, bs); |
81d0912d FB |
1027 | } |
1028 | } | |
1029 | ||
ea2384d3 FB |
1030 | const char *bdrv_get_device_name(BlockDriverState *bs) |
1031 | { | |
1032 | return bs->device_name; | |
1033 | } | |
1034 | ||
7a6cba61 PB |
1035 | void bdrv_flush(BlockDriverState *bs) |
1036 | { | |
081501da AL |
1037 | if (!bs->drv) |
1038 | return; | |
7a6cba61 PB |
1039 | if (bs->drv->bdrv_flush) |
1040 | bs->drv->bdrv_flush(bs); | |
1041 | if (bs->backing_hd) | |
1042 | bdrv_flush(bs->backing_hd); | |
1043 | } | |
1044 | ||
c6ca28d6 AL |
1045 | void bdrv_flush_all(void) |
1046 | { | |
1047 | BlockDriverState *bs; | |
1048 | ||
1049 | for (bs = bdrv_first; bs != NULL; bs = bs->next) | |
1050 | if (bs->drv && !bdrv_is_read_only(bs) && | |
1051 | (!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) | |
1052 | bdrv_flush(bs); | |
1053 | } | |
1054 | ||
f58c7b35 TS |
1055 | /* |
1056 | * Returns true iff the specified sector is present in the disk image. Drivers | |
1057 | * not implementing the functionality are assumed to not support backing files, | |
1058 | * hence all their sectors are reported as allocated. | |
1059 | * | |
1060 | * 'pnum' is set to the number of sectors (including and immediately following | |
1061 | * the specified sector) that are known to be in the same | |
1062 | * allocated/unallocated state. | |
1063 | * | |
1064 | * 'nb_sectors' is the max value 'pnum' should be set to. | |
1065 | */ | |
1066 | int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, | |
1067 | int *pnum) | |
1068 | { | |
1069 | int64_t n; | |
1070 | if (!bs->drv->bdrv_is_allocated) { | |
1071 | if (sector_num >= bs->total_sectors) { | |
1072 | *pnum = 0; | |
1073 | return 0; | |
1074 | } | |
1075 | n = bs->total_sectors - sector_num; | |
1076 | *pnum = (n < nb_sectors) ? (n) : (nb_sectors); | |
1077 | return 1; | |
1078 | } | |
1079 | return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum); | |
1080 | } | |
1081 | ||
376253ec | 1082 | void bdrv_info(Monitor *mon) |
b338082b FB |
1083 | { |
1084 | BlockDriverState *bs; | |
1085 | ||
1086 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
376253ec AL |
1087 | monitor_printf(mon, "%s:", bs->device_name); |
1088 | monitor_printf(mon, " type="); | |
b338082b FB |
1089 | switch(bs->type) { |
1090 | case BDRV_TYPE_HD: | |
376253ec | 1091 | monitor_printf(mon, "hd"); |
b338082b FB |
1092 | break; |
1093 | case BDRV_TYPE_CDROM: | |
376253ec | 1094 | monitor_printf(mon, "cdrom"); |
b338082b FB |
1095 | break; |
1096 | case BDRV_TYPE_FLOPPY: | |
376253ec | 1097 | monitor_printf(mon, "floppy"); |
b338082b FB |
1098 | break; |
1099 | } | |
376253ec | 1100 | monitor_printf(mon, " removable=%d", bs->removable); |
b338082b | 1101 | if (bs->removable) { |
376253ec | 1102 | monitor_printf(mon, " locked=%d", bs->locked); |
b338082b | 1103 | } |
19cb3738 | 1104 | if (bs->drv) { |
376253ec AL |
1105 | monitor_printf(mon, " file="); |
1106 | monitor_print_filename(mon, bs->filename); | |
fef30743 | 1107 | if (bs->backing_file[0] != '\0') { |
376253ec AL |
1108 | monitor_printf(mon, " backing_file="); |
1109 | monitor_print_filename(mon, bs->backing_file); | |
1110 | } | |
1111 | monitor_printf(mon, " ro=%d", bs->read_only); | |
1112 | monitor_printf(mon, " drv=%s", bs->drv->format_name); | |
1113 | monitor_printf(mon, " encrypted=%d", bdrv_is_encrypted(bs)); | |
b338082b | 1114 | } else { |
376253ec | 1115 | monitor_printf(mon, " [not inserted]"); |
b338082b | 1116 | } |
376253ec | 1117 | monitor_printf(mon, "\n"); |
b338082b FB |
1118 | } |
1119 | } | |
a36e69dd TS |
1120 | |
1121 | /* The "info blockstats" command. */ | |
376253ec | 1122 | void bdrv_info_stats(Monitor *mon) |
a36e69dd TS |
1123 | { |
1124 | BlockDriverState *bs; | |
1125 | ||
1126 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
376253ec AL |
1127 | monitor_printf(mon, "%s:" |
1128 | " rd_bytes=%" PRIu64 | |
1129 | " wr_bytes=%" PRIu64 | |
1130 | " rd_operations=%" PRIu64 | |
1131 | " wr_operations=%" PRIu64 | |
ebf53fcd | 1132 | "\n", |
376253ec AL |
1133 | bs->device_name, |
1134 | bs->rd_bytes, bs->wr_bytes, | |
1135 | bs->rd_ops, bs->wr_ops); | |
a36e69dd TS |
1136 | } |
1137 | } | |
ea2384d3 | 1138 | |
045df330 AL |
1139 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
1140 | { | |
1141 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
1142 | return bs->backing_file; | |
1143 | else if (bs->encrypted) | |
1144 | return bs->filename; | |
1145 | else | |
1146 | return NULL; | |
1147 | } | |
1148 | ||
5fafdf24 | 1149 | void bdrv_get_backing_filename(BlockDriverState *bs, |
83f64091 FB |
1150 | char *filename, int filename_size) |
1151 | { | |
1152 | if (!bs->backing_hd) { | |
1153 | pstrcpy(filename, filename_size, ""); | |
1154 | } else { | |
1155 | pstrcpy(filename, filename_size, bs->backing_file); | |
1156 | } | |
1157 | } | |
1158 | ||
5fafdf24 | 1159 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
faea38e7 FB |
1160 | const uint8_t *buf, int nb_sectors) |
1161 | { | |
1162 | BlockDriver *drv = bs->drv; | |
1163 | if (!drv) | |
19cb3738 | 1164 | return -ENOMEDIUM; |
faea38e7 FB |
1165 | if (!drv->bdrv_write_compressed) |
1166 | return -ENOTSUP; | |
fbb7b4e0 KW |
1167 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
1168 | return -EIO; | |
faea38e7 FB |
1169 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
1170 | } | |
3b46e624 | 1171 | |
faea38e7 FB |
1172 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
1173 | { | |
1174 | BlockDriver *drv = bs->drv; | |
1175 | if (!drv) | |
19cb3738 | 1176 | return -ENOMEDIUM; |
faea38e7 FB |
1177 | if (!drv->bdrv_get_info) |
1178 | return -ENOTSUP; | |
1179 | memset(bdi, 0, sizeof(*bdi)); | |
1180 | return drv->bdrv_get_info(bs, bdi); | |
1181 | } | |
1182 | ||
45566e9c CH |
1183 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
1184 | int64_t pos, int size) | |
178e08a5 AL |
1185 | { |
1186 | BlockDriver *drv = bs->drv; | |
1187 | if (!drv) | |
1188 | return -ENOMEDIUM; | |
45566e9c | 1189 | if (!drv->bdrv_save_vmstate) |
178e08a5 | 1190 | return -ENOTSUP; |
45566e9c | 1191 | return drv->bdrv_save_vmstate(bs, buf, pos, size); |
178e08a5 AL |
1192 | } |
1193 | ||
45566e9c CH |
1194 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
1195 | int64_t pos, int size) | |
178e08a5 AL |
1196 | { |
1197 | BlockDriver *drv = bs->drv; | |
1198 | if (!drv) | |
1199 | return -ENOMEDIUM; | |
45566e9c | 1200 | if (!drv->bdrv_load_vmstate) |
178e08a5 | 1201 | return -ENOTSUP; |
45566e9c | 1202 | return drv->bdrv_load_vmstate(bs, buf, pos, size); |
178e08a5 AL |
1203 | } |
1204 | ||
faea38e7 FB |
1205 | /**************************************************************/ |
1206 | /* handling of snapshots */ | |
1207 | ||
5fafdf24 | 1208 | int bdrv_snapshot_create(BlockDriverState *bs, |
faea38e7 FB |
1209 | QEMUSnapshotInfo *sn_info) |
1210 | { | |
1211 | BlockDriver *drv = bs->drv; | |
1212 | if (!drv) | |
19cb3738 | 1213 | return -ENOMEDIUM; |
faea38e7 FB |
1214 | if (!drv->bdrv_snapshot_create) |
1215 | return -ENOTSUP; | |
1216 | return drv->bdrv_snapshot_create(bs, sn_info); | |
1217 | } | |
1218 | ||
5fafdf24 | 1219 | int bdrv_snapshot_goto(BlockDriverState *bs, |
faea38e7 FB |
1220 | const char *snapshot_id) |
1221 | { | |
1222 | BlockDriver *drv = bs->drv; | |
1223 | if (!drv) | |
19cb3738 | 1224 | return -ENOMEDIUM; |
faea38e7 FB |
1225 | if (!drv->bdrv_snapshot_goto) |
1226 | return -ENOTSUP; | |
1227 | return drv->bdrv_snapshot_goto(bs, snapshot_id); | |
1228 | } | |
1229 | ||
1230 | int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) | |
1231 | { | |
1232 | BlockDriver *drv = bs->drv; | |
1233 | if (!drv) | |
19cb3738 | 1234 | return -ENOMEDIUM; |
faea38e7 FB |
1235 | if (!drv->bdrv_snapshot_delete) |
1236 | return -ENOTSUP; | |
1237 | return drv->bdrv_snapshot_delete(bs, snapshot_id); | |
1238 | } | |
1239 | ||
5fafdf24 | 1240 | int bdrv_snapshot_list(BlockDriverState *bs, |
faea38e7 FB |
1241 | QEMUSnapshotInfo **psn_info) |
1242 | { | |
1243 | BlockDriver *drv = bs->drv; | |
1244 | if (!drv) | |
19cb3738 | 1245 | return -ENOMEDIUM; |
faea38e7 FB |
1246 | if (!drv->bdrv_snapshot_list) |
1247 | return -ENOTSUP; | |
1248 | return drv->bdrv_snapshot_list(bs, psn_info); | |
1249 | } | |
1250 | ||
1251 | #define NB_SUFFIXES 4 | |
1252 | ||
1253 | char *get_human_readable_size(char *buf, int buf_size, int64_t size) | |
1254 | { | |
1255 | static const char suffixes[NB_SUFFIXES] = "KMGT"; | |
1256 | int64_t base; | |
1257 | int i; | |
1258 | ||
1259 | if (size <= 999) { | |
1260 | snprintf(buf, buf_size, "%" PRId64, size); | |
1261 | } else { | |
1262 | base = 1024; | |
1263 | for(i = 0; i < NB_SUFFIXES; i++) { | |
1264 | if (size < (10 * base)) { | |
5fafdf24 | 1265 | snprintf(buf, buf_size, "%0.1f%c", |
faea38e7 FB |
1266 | (double)size / base, |
1267 | suffixes[i]); | |
1268 | break; | |
1269 | } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { | |
5fafdf24 | 1270 | snprintf(buf, buf_size, "%" PRId64 "%c", |
faea38e7 FB |
1271 | ((size + (base >> 1)) / base), |
1272 | suffixes[i]); | |
1273 | break; | |
1274 | } | |
1275 | base = base * 1024; | |
1276 | } | |
1277 | } | |
1278 | return buf; | |
1279 | } | |
1280 | ||
1281 | char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) | |
1282 | { | |
1283 | char buf1[128], date_buf[128], clock_buf[128]; | |
3b9f94e1 FB |
1284 | #ifdef _WIN32 |
1285 | struct tm *ptm; | |
1286 | #else | |
faea38e7 | 1287 | struct tm tm; |
3b9f94e1 | 1288 | #endif |
faea38e7 FB |
1289 | time_t ti; |
1290 | int64_t secs; | |
1291 | ||
1292 | if (!sn) { | |
5fafdf24 TS |
1293 | snprintf(buf, buf_size, |
1294 | "%-10s%-20s%7s%20s%15s", | |
faea38e7 FB |
1295 | "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
1296 | } else { | |
1297 | ti = sn->date_sec; | |
3b9f94e1 FB |
1298 | #ifdef _WIN32 |
1299 | ptm = localtime(&ti); | |
1300 | strftime(date_buf, sizeof(date_buf), | |
1301 | "%Y-%m-%d %H:%M:%S", ptm); | |
1302 | #else | |
faea38e7 FB |
1303 | localtime_r(&ti, &tm); |
1304 | strftime(date_buf, sizeof(date_buf), | |
1305 | "%Y-%m-%d %H:%M:%S", &tm); | |
3b9f94e1 | 1306 | #endif |
faea38e7 FB |
1307 | secs = sn->vm_clock_nsec / 1000000000; |
1308 | snprintf(clock_buf, sizeof(clock_buf), | |
1309 | "%02d:%02d:%02d.%03d", | |
1310 | (int)(secs / 3600), | |
1311 | (int)((secs / 60) % 60), | |
5fafdf24 | 1312 | (int)(secs % 60), |
faea38e7 FB |
1313 | (int)((sn->vm_clock_nsec / 1000000) % 1000)); |
1314 | snprintf(buf, buf_size, | |
5fafdf24 | 1315 | "%-10s%-20s%7s%20s%15s", |
faea38e7 FB |
1316 | sn->id_str, sn->name, |
1317 | get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), | |
1318 | date_buf, | |
1319 | clock_buf); | |
1320 | } | |
1321 | return buf; | |
1322 | } | |
1323 | ||
83f64091 | 1324 | |
ea2384d3 | 1325 | /**************************************************************/ |
83f64091 | 1326 | /* async I/Os */ |
ea2384d3 | 1327 | |
3b69e4b9 | 1328 | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
f141eafe | 1329 | QEMUIOVector *qiov, int nb_sectors, |
3b69e4b9 | 1330 | BlockDriverCompletionFunc *cb, void *opaque) |
83f64091 FB |
1331 | { |
1332 | BlockDriver *drv = bs->drv; | |
a36e69dd | 1333 | BlockDriverAIOCB *ret; |
83f64091 | 1334 | |
19cb3738 | 1335 | if (!drv) |
ce1a14dc | 1336 | return NULL; |
71d0770c AL |
1337 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
1338 | return NULL; | |
3b46e624 | 1339 | |
f141eafe AL |
1340 | ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors, |
1341 | cb, opaque); | |
a36e69dd TS |
1342 | |
1343 | if (ret) { | |
1344 | /* Update stats even though technically transfer has not happened. */ | |
1345 | bs->rd_bytes += (unsigned) nb_sectors * SECTOR_SIZE; | |
1346 | bs->rd_ops ++; | |
1347 | } | |
1348 | ||
1349 | return ret; | |
ea2384d3 FB |
1350 | } |
1351 | ||
f141eafe AL |
1352 | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
1353 | QEMUIOVector *qiov, int nb_sectors, | |
1354 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 1355 | { |
83f64091 | 1356 | BlockDriver *drv = bs->drv; |
a36e69dd | 1357 | BlockDriverAIOCB *ret; |
ea2384d3 | 1358 | |
19cb3738 | 1359 | if (!drv) |
ce1a14dc | 1360 | return NULL; |
83f64091 | 1361 | if (bs->read_only) |
ce1a14dc | 1362 | return NULL; |
71d0770c AL |
1363 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
1364 | return NULL; | |
83f64091 | 1365 | |
f141eafe AL |
1366 | ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors, |
1367 | cb, opaque); | |
a36e69dd TS |
1368 | |
1369 | if (ret) { | |
1370 | /* Update stats even though technically transfer has not happened. */ | |
1371 | bs->wr_bytes += (unsigned) nb_sectors * SECTOR_SIZE; | |
1372 | bs->wr_ops ++; | |
1373 | } | |
1374 | ||
1375 | return ret; | |
83f64091 FB |
1376 | } |
1377 | ||
40b4f539 KW |
1378 | |
1379 | typedef struct MultiwriteCB { | |
1380 | int error; | |
1381 | int num_requests; | |
1382 | int num_callbacks; | |
1383 | struct { | |
1384 | BlockDriverCompletionFunc *cb; | |
1385 | void *opaque; | |
1386 | QEMUIOVector *free_qiov; | |
1387 | void *free_buf; | |
1388 | } callbacks[]; | |
1389 | } MultiwriteCB; | |
1390 | ||
1391 | static void multiwrite_user_cb(MultiwriteCB *mcb) | |
1392 | { | |
1393 | int i; | |
1394 | ||
1395 | for (i = 0; i < mcb->num_callbacks; i++) { | |
1396 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); | |
1397 | qemu_free(mcb->callbacks[i].free_qiov); | |
1398 | qemu_free(mcb->callbacks[i].free_buf); | |
1399 | } | |
1400 | } | |
1401 | ||
1402 | static void multiwrite_cb(void *opaque, int ret) | |
1403 | { | |
1404 | MultiwriteCB *mcb = opaque; | |
1405 | ||
1406 | if (ret < 0) { | |
1407 | mcb->error = ret; | |
1408 | multiwrite_user_cb(mcb); | |
1409 | } | |
1410 | ||
1411 | mcb->num_requests--; | |
1412 | if (mcb->num_requests == 0) { | |
1413 | if (mcb->error == 0) { | |
1414 | multiwrite_user_cb(mcb); | |
1415 | } | |
1416 | qemu_free(mcb); | |
1417 | } | |
1418 | } | |
1419 | ||
1420 | static int multiwrite_req_compare(const void *a, const void *b) | |
1421 | { | |
1422 | return (((BlockRequest*) a)->sector - ((BlockRequest*) b)->sector); | |
1423 | } | |
1424 | ||
1425 | /* | |
1426 | * Takes a bunch of requests and tries to merge them. Returns the number of | |
1427 | * requests that remain after merging. | |
1428 | */ | |
1429 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, | |
1430 | int num_reqs, MultiwriteCB *mcb) | |
1431 | { | |
1432 | int i, outidx; | |
1433 | ||
1434 | // Sort requests by start sector | |
1435 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); | |
1436 | ||
1437 | // Check if adjacent requests touch the same clusters. If so, combine them, | |
1438 | // filling up gaps with zero sectors. | |
1439 | outidx = 0; | |
1440 | for (i = 1; i < num_reqs; i++) { | |
1441 | int merge = 0; | |
1442 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; | |
1443 | ||
1444 | // This handles the cases that are valid for all block drivers, namely | |
1445 | // exactly sequential writes and overlapping writes. | |
1446 | if (reqs[i].sector <= oldreq_last) { | |
1447 | merge = 1; | |
1448 | } | |
1449 | ||
1450 | // The block driver may decide that it makes sense to combine requests | |
1451 | // even if there is a gap of some sectors between them. In this case, | |
1452 | // the gap is filled with zeros (therefore only applicable for yet | |
1453 | // unused space in format like qcow2). | |
1454 | if (!merge && bs->drv->bdrv_merge_requests) { | |
1455 | merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]); | |
1456 | } | |
1457 | ||
1458 | if (merge) { | |
1459 | size_t size; | |
1460 | QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov)); | |
1461 | qemu_iovec_init(qiov, | |
1462 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); | |
1463 | ||
1464 | // Add the first request to the merged one. If the requests are | |
1465 | // overlapping, drop the last sectors of the first request. | |
1466 | size = (reqs[i].sector - reqs[outidx].sector) << 9; | |
1467 | qemu_iovec_concat(qiov, reqs[outidx].qiov, size); | |
1468 | ||
1469 | // We might need to add some zeros between the two requests | |
1470 | if (reqs[i].sector > oldreq_last) { | |
1471 | size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9; | |
1472 | uint8_t *buf = qemu_blockalign(bs, zero_bytes); | |
1473 | memset(buf, 0, zero_bytes); | |
1474 | qemu_iovec_add(qiov, buf, zero_bytes); | |
1475 | mcb->callbacks[i].free_buf = buf; | |
1476 | } | |
1477 | ||
1478 | // Add the second request | |
1479 | qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size); | |
1480 | ||
1481 | reqs[outidx].nb_sectors += reqs[i].nb_sectors; | |
1482 | reqs[outidx].qiov = qiov; | |
1483 | ||
1484 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; | |
1485 | } else { | |
1486 | outidx++; | |
1487 | reqs[outidx].sector = reqs[i].sector; | |
1488 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; | |
1489 | reqs[outidx].qiov = reqs[i].qiov; | |
1490 | } | |
1491 | } | |
1492 | ||
1493 | return outidx + 1; | |
1494 | } | |
1495 | ||
1496 | /* | |
1497 | * Submit multiple AIO write requests at once. | |
1498 | * | |
1499 | * On success, the function returns 0 and all requests in the reqs array have | |
1500 | * been submitted. In error case this function returns -1, and any of the | |
1501 | * requests may or may not be submitted yet. In particular, this means that the | |
1502 | * callback will be called for some of the requests, for others it won't. The | |
1503 | * caller must check the error field of the BlockRequest to wait for the right | |
1504 | * callbacks (if error != 0, no callback will be called). | |
1505 | * | |
1506 | * The implementation may modify the contents of the reqs array, e.g. to merge | |
1507 | * requests. However, the fields opaque and error are left unmodified as they | |
1508 | * are used to signal failure for a single request to the caller. | |
1509 | */ | |
1510 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) | |
1511 | { | |
1512 | BlockDriverAIOCB *acb; | |
1513 | MultiwriteCB *mcb; | |
1514 | int i; | |
1515 | ||
1516 | if (num_reqs == 0) { | |
1517 | return 0; | |
1518 | } | |
1519 | ||
1520 | // Create MultiwriteCB structure | |
1521 | mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); | |
1522 | mcb->num_requests = 0; | |
1523 | mcb->num_callbacks = num_reqs; | |
1524 | ||
1525 | for (i = 0; i < num_reqs; i++) { | |
1526 | mcb->callbacks[i].cb = reqs[i].cb; | |
1527 | mcb->callbacks[i].opaque = reqs[i].opaque; | |
1528 | } | |
1529 | ||
1530 | // Check for mergable requests | |
1531 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); | |
1532 | ||
1533 | // Run the aio requests | |
1534 | for (i = 0; i < num_reqs; i++) { | |
1535 | acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, | |
1536 | reqs[i].nb_sectors, multiwrite_cb, mcb); | |
1537 | ||
1538 | if (acb == NULL) { | |
1539 | // We can only fail the whole thing if no request has been | |
1540 | // submitted yet. Otherwise we'll wait for the submitted AIOs to | |
1541 | // complete and report the error in the callback. | |
1542 | if (mcb->num_requests == 0) { | |
1543 | reqs[i].error = EIO; | |
1544 | goto fail; | |
1545 | } else { | |
1546 | mcb->error = EIO; | |
1547 | break; | |
1548 | } | |
1549 | } else { | |
1550 | mcb->num_requests++; | |
1551 | } | |
1552 | } | |
1553 | ||
1554 | return 0; | |
1555 | ||
1556 | fail: | |
1557 | free(mcb); | |
1558 | return -1; | |
1559 | } | |
1560 | ||
b2e12bc6 CH |
1561 | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
1562 | BlockDriverCompletionFunc *cb, void *opaque) | |
1563 | { | |
1564 | BlockDriver *drv = bs->drv; | |
1565 | ||
1566 | if (!drv) | |
1567 | return NULL; | |
1568 | ||
1569 | /* | |
1570 | * Note that unlike bdrv_flush the driver is reponsible for flushing a | |
1571 | * backing image if it exists. | |
1572 | */ | |
1573 | return drv->bdrv_aio_flush(bs, cb, opaque); | |
1574 | } | |
1575 | ||
83f64091 | 1576 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
83f64091 | 1577 | { |
6bbff9a0 | 1578 | acb->pool->cancel(acb); |
83f64091 FB |
1579 | } |
1580 | ||
ce1a14dc | 1581 | |
83f64091 FB |
1582 | /**************************************************************/ |
1583 | /* async block device emulation */ | |
1584 | ||
c16b5a2c CH |
1585 | typedef struct BlockDriverAIOCBSync { |
1586 | BlockDriverAIOCB common; | |
1587 | QEMUBH *bh; | |
1588 | int ret; | |
1589 | /* vector translation state */ | |
1590 | QEMUIOVector *qiov; | |
1591 | uint8_t *bounce; | |
1592 | int is_write; | |
1593 | } BlockDriverAIOCBSync; | |
1594 | ||
1595 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) | |
1596 | { | |
1597 | BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb; | |
6a7ad299 | 1598 | qemu_bh_delete(acb->bh); |
36afc451 | 1599 | acb->bh = NULL; |
c16b5a2c CH |
1600 | qemu_aio_release(acb); |
1601 | } | |
1602 | ||
1603 | static AIOPool bdrv_em_aio_pool = { | |
1604 | .aiocb_size = sizeof(BlockDriverAIOCBSync), | |
1605 | .cancel = bdrv_aio_cancel_em, | |
1606 | }; | |
1607 | ||
ce1a14dc | 1608 | static void bdrv_aio_bh_cb(void *opaque) |
83f64091 | 1609 | { |
ce1a14dc | 1610 | BlockDriverAIOCBSync *acb = opaque; |
f141eafe | 1611 | |
f141eafe AL |
1612 | if (!acb->is_write) |
1613 | qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); | |
ceb42de8 | 1614 | qemu_vfree(acb->bounce); |
ce1a14dc | 1615 | acb->common.cb(acb->common.opaque, acb->ret); |
6a7ad299 | 1616 | qemu_bh_delete(acb->bh); |
36afc451 | 1617 | acb->bh = NULL; |
ce1a14dc | 1618 | qemu_aio_release(acb); |
83f64091 | 1619 | } |
beac80cd | 1620 | |
f141eafe AL |
1621 | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
1622 | int64_t sector_num, | |
1623 | QEMUIOVector *qiov, | |
1624 | int nb_sectors, | |
1625 | BlockDriverCompletionFunc *cb, | |
1626 | void *opaque, | |
1627 | int is_write) | |
1628 | ||
83f64091 | 1629 | { |
ce1a14dc | 1630 | BlockDriverAIOCBSync *acb; |
ce1a14dc | 1631 | |
c16b5a2c | 1632 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
f141eafe AL |
1633 | acb->is_write = is_write; |
1634 | acb->qiov = qiov; | |
e268ca52 | 1635 | acb->bounce = qemu_blockalign(bs, qiov->size); |
f141eafe | 1636 | |
ce1a14dc PB |
1637 | if (!acb->bh) |
1638 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
f141eafe AL |
1639 | |
1640 | if (is_write) { | |
1641 | qemu_iovec_to_buffer(acb->qiov, acb->bounce); | |
1642 | acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors); | |
1643 | } else { | |
1644 | acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors); | |
1645 | } | |
1646 | ||
ce1a14dc | 1647 | qemu_bh_schedule(acb->bh); |
f141eafe | 1648 | |
ce1a14dc | 1649 | return &acb->common; |
beac80cd FB |
1650 | } |
1651 | ||
f141eafe AL |
1652 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
1653 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 1654 | BlockDriverCompletionFunc *cb, void *opaque) |
beac80cd | 1655 | { |
f141eafe AL |
1656 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
1657 | } | |
83f64091 | 1658 | |
f141eafe AL |
1659 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
1660 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
1661 | BlockDriverCompletionFunc *cb, void *opaque) | |
1662 | { | |
1663 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); | |
beac80cd | 1664 | } |
beac80cd | 1665 | |
b2e12bc6 CH |
1666 | static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, |
1667 | BlockDriverCompletionFunc *cb, void *opaque) | |
1668 | { | |
1669 | BlockDriverAIOCBSync *acb; | |
1670 | ||
1671 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); | |
1672 | acb->is_write = 1; /* don't bounce in the completion hadler */ | |
1673 | acb->qiov = NULL; | |
1674 | acb->bounce = NULL; | |
1675 | acb->ret = 0; | |
1676 | ||
1677 | if (!acb->bh) | |
1678 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
1679 | ||
1680 | bdrv_flush(bs); | |
1681 | qemu_bh_schedule(acb->bh); | |
1682 | return &acb->common; | |
1683 | } | |
1684 | ||
83f64091 FB |
1685 | /**************************************************************/ |
1686 | /* sync block device emulation */ | |
ea2384d3 | 1687 | |
83f64091 FB |
1688 | static void bdrv_rw_em_cb(void *opaque, int ret) |
1689 | { | |
1690 | *(int *)opaque = ret; | |
ea2384d3 FB |
1691 | } |
1692 | ||
83f64091 FB |
1693 | #define NOT_DONE 0x7fffffff |
1694 | ||
5fafdf24 | 1695 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
83f64091 | 1696 | uint8_t *buf, int nb_sectors) |
7a6cba61 | 1697 | { |
ce1a14dc PB |
1698 | int async_ret; |
1699 | BlockDriverAIOCB *acb; | |
f141eafe AL |
1700 | struct iovec iov; |
1701 | QEMUIOVector qiov; | |
83f64091 | 1702 | |
83f64091 | 1703 | async_ret = NOT_DONE; |
3f4cb3d3 | 1704 | iov.iov_base = (void *)buf; |
f141eafe AL |
1705 | iov.iov_len = nb_sectors * 512; |
1706 | qemu_iovec_init_external(&qiov, &iov, 1); | |
1707 | acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors, | |
1708 | bdrv_rw_em_cb, &async_ret); | |
baf35cb9 | 1709 | if (acb == NULL) |
ce1a14dc | 1710 | return -1; |
baf35cb9 | 1711 | |
83f64091 FB |
1712 | while (async_ret == NOT_DONE) { |
1713 | qemu_aio_wait(); | |
1714 | } | |
baf35cb9 | 1715 | |
83f64091 | 1716 | return async_ret; |
7a6cba61 PB |
1717 | } |
1718 | ||
83f64091 FB |
1719 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
1720 | const uint8_t *buf, int nb_sectors) | |
1721 | { | |
ce1a14dc PB |
1722 | int async_ret; |
1723 | BlockDriverAIOCB *acb; | |
f141eafe AL |
1724 | struct iovec iov; |
1725 | QEMUIOVector qiov; | |
83f64091 | 1726 | |
83f64091 | 1727 | async_ret = NOT_DONE; |
f141eafe AL |
1728 | iov.iov_base = (void *)buf; |
1729 | iov.iov_len = nb_sectors * 512; | |
1730 | qemu_iovec_init_external(&qiov, &iov, 1); | |
1731 | acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors, | |
1732 | bdrv_rw_em_cb, &async_ret); | |
baf35cb9 | 1733 | if (acb == NULL) |
ce1a14dc | 1734 | return -1; |
83f64091 FB |
1735 | while (async_ret == NOT_DONE) { |
1736 | qemu_aio_wait(); | |
1737 | } | |
83f64091 FB |
1738 | return async_ret; |
1739 | } | |
ea2384d3 FB |
1740 | |
1741 | void bdrv_init(void) | |
1742 | { | |
5efa9d5a | 1743 | module_call_init(MODULE_INIT_BLOCK); |
ea2384d3 | 1744 | } |
ce1a14dc | 1745 | |
c16b5a2c CH |
1746 | void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs, |
1747 | BlockDriverCompletionFunc *cb, void *opaque) | |
ce1a14dc | 1748 | { |
ce1a14dc PB |
1749 | BlockDriverAIOCB *acb; |
1750 | ||
6bbff9a0 AL |
1751 | if (pool->free_aiocb) { |
1752 | acb = pool->free_aiocb; | |
1753 | pool->free_aiocb = acb->next; | |
ce1a14dc | 1754 | } else { |
6bbff9a0 AL |
1755 | acb = qemu_mallocz(pool->aiocb_size); |
1756 | acb->pool = pool; | |
ce1a14dc PB |
1757 | } |
1758 | acb->bs = bs; | |
1759 | acb->cb = cb; | |
1760 | acb->opaque = opaque; | |
1761 | return acb; | |
1762 | } | |
1763 | ||
1764 | void qemu_aio_release(void *p) | |
1765 | { | |
6bbff9a0 AL |
1766 | BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; |
1767 | AIOPool *pool = acb->pool; | |
1768 | acb->next = pool->free_aiocb; | |
1769 | pool->free_aiocb = acb; | |
ce1a14dc | 1770 | } |
19cb3738 FB |
1771 | |
1772 | /**************************************************************/ | |
1773 | /* removable device support */ | |
1774 | ||
1775 | /** | |
1776 | * Return TRUE if the media is present | |
1777 | */ | |
1778 | int bdrv_is_inserted(BlockDriverState *bs) | |
1779 | { | |
1780 | BlockDriver *drv = bs->drv; | |
1781 | int ret; | |
1782 | if (!drv) | |
1783 | return 0; | |
1784 | if (!drv->bdrv_is_inserted) | |
1785 | return 1; | |
1786 | ret = drv->bdrv_is_inserted(bs); | |
1787 | return ret; | |
1788 | } | |
1789 | ||
1790 | /** | |
1791 | * Return TRUE if the media changed since the last call to this | |
5fafdf24 | 1792 | * function. It is currently only used for floppy disks |
19cb3738 FB |
1793 | */ |
1794 | int bdrv_media_changed(BlockDriverState *bs) | |
1795 | { | |
1796 | BlockDriver *drv = bs->drv; | |
1797 | int ret; | |
1798 | ||
1799 | if (!drv || !drv->bdrv_media_changed) | |
1800 | ret = -ENOTSUP; | |
1801 | else | |
1802 | ret = drv->bdrv_media_changed(bs); | |
1803 | if (ret == -ENOTSUP) | |
1804 | ret = bs->media_changed; | |
1805 | bs->media_changed = 0; | |
1806 | return ret; | |
1807 | } | |
1808 | ||
1809 | /** | |
1810 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
1811 | */ | |
aea2a33c | 1812 | int bdrv_eject(BlockDriverState *bs, int eject_flag) |
19cb3738 FB |
1813 | { |
1814 | BlockDriver *drv = bs->drv; | |
1815 | int ret; | |
1816 | ||
aea2a33c MM |
1817 | if (bs->locked) { |
1818 | return -EBUSY; | |
1819 | } | |
1820 | ||
19cb3738 FB |
1821 | if (!drv || !drv->bdrv_eject) { |
1822 | ret = -ENOTSUP; | |
1823 | } else { | |
1824 | ret = drv->bdrv_eject(bs, eject_flag); | |
1825 | } | |
1826 | if (ret == -ENOTSUP) { | |
1827 | if (eject_flag) | |
1828 | bdrv_close(bs); | |
aea2a33c | 1829 | ret = 0; |
19cb3738 | 1830 | } |
aea2a33c MM |
1831 | |
1832 | return ret; | |
19cb3738 FB |
1833 | } |
1834 | ||
1835 | int bdrv_is_locked(BlockDriverState *bs) | |
1836 | { | |
1837 | return bs->locked; | |
1838 | } | |
1839 | ||
1840 | /** | |
1841 | * Lock or unlock the media (if it is locked, the user won't be able | |
1842 | * to eject it manually). | |
1843 | */ | |
1844 | void bdrv_set_locked(BlockDriverState *bs, int locked) | |
1845 | { | |
1846 | BlockDriver *drv = bs->drv; | |
1847 | ||
1848 | bs->locked = locked; | |
1849 | if (drv && drv->bdrv_set_locked) { | |
1850 | drv->bdrv_set_locked(bs, locked); | |
1851 | } | |
1852 | } | |
985a03b0 TS |
1853 | |
1854 | /* needed for generic scsi interface */ | |
1855 | ||
1856 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
1857 | { | |
1858 | BlockDriver *drv = bs->drv; | |
1859 | ||
1860 | if (drv && drv->bdrv_ioctl) | |
1861 | return drv->bdrv_ioctl(bs, req, buf); | |
1862 | return -ENOTSUP; | |
1863 | } | |
7d780669 | 1864 | |
221f715d AL |
1865 | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
1866 | unsigned long int req, void *buf, | |
1867 | BlockDriverCompletionFunc *cb, void *opaque) | |
7d780669 | 1868 | { |
221f715d | 1869 | BlockDriver *drv = bs->drv; |
7d780669 | 1870 | |
221f715d AL |
1871 | if (drv && drv->bdrv_aio_ioctl) |
1872 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); | |
1873 | return NULL; | |
7d780669 | 1874 | } |
e268ca52 AL |
1875 | |
1876 | void *qemu_blockalign(BlockDriverState *bs, size_t size) | |
1877 | { | |
1878 | return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); | |
1879 | } |