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Commit | Line | Data |
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fc01f7e7 FB |
1 | /* |
2 | * QEMU System Emulator block driver | |
5fafdf24 | 3 | * |
fc01f7e7 | 4 | * Copyright (c) 2003 Fabrice Bellard |
5fafdf24 | 5 | * |
fc01f7e7 FB |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
7 | * of this software and associated documentation files (the "Software"), to deal | |
8 | * in the Software without restriction, including without limitation the rights | |
9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
10 | * copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
22 | * THE SOFTWARE. | |
23 | */ | |
3990d09a | 24 | #include "config-host.h" |
faf07963 | 25 | #include "qemu-common.h" |
376253ec | 26 | #include "monitor.h" |
ea2384d3 | 27 | #include "block_int.h" |
5efa9d5a | 28 | #include "module.h" |
d15e5465 | 29 | #include "qemu-objects.h" |
fc01f7e7 | 30 | |
71e72a19 | 31 | #ifdef CONFIG_BSD |
7674e7bf FB |
32 | #include <sys/types.h> |
33 | #include <sys/stat.h> | |
34 | #include <sys/ioctl.h> | |
72cf2d4f | 35 | #include <sys/queue.h> |
c5e97233 | 36 | #ifndef __DragonFly__ |
7674e7bf FB |
37 | #include <sys/disk.h> |
38 | #endif | |
c5e97233 | 39 | #endif |
7674e7bf | 40 | |
49dc768d AL |
41 | #ifdef _WIN32 |
42 | #include <windows.h> | |
43 | #endif | |
44 | ||
f141eafe AL |
45 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
46 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
c87c0672 | 47 | BlockDriverCompletionFunc *cb, void *opaque); |
f141eafe AL |
48 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
49 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 50 | BlockDriverCompletionFunc *cb, void *opaque); |
b2e12bc6 CH |
51 | static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, |
52 | BlockDriverCompletionFunc *cb, void *opaque); | |
5fafdf24 | 53 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
83f64091 FB |
54 | uint8_t *buf, int nb_sectors); |
55 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, | |
56 | const uint8_t *buf, int nb_sectors); | |
84a12e66 | 57 | static BlockDriver *find_protocol(const char *filename); |
ec530c81 | 58 | |
1b7bdbc1 SH |
59 | static QTAILQ_HEAD(, BlockDriverState) bdrv_states = |
60 | QTAILQ_HEAD_INITIALIZER(bdrv_states); | |
7ee930d0 | 61 | |
8a22f02a SH |
62 | static QLIST_HEAD(, BlockDriver) bdrv_drivers = |
63 | QLIST_HEAD_INITIALIZER(bdrv_drivers); | |
ea2384d3 | 64 | |
eb852011 MA |
65 | /* If non-zero, use only whitelisted block drivers */ |
66 | static int use_bdrv_whitelist; | |
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 | ||
8a22f02a | 147 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
ea2384d3 | 148 | } |
b338082b FB |
149 | |
150 | /* create a new block device (by default it is empty) */ | |
151 | BlockDriverState *bdrv_new(const char *device_name) | |
152 | { | |
1b7bdbc1 | 153 | BlockDriverState *bs; |
b338082b FB |
154 | |
155 | bs = qemu_mallocz(sizeof(BlockDriverState)); | |
b338082b | 156 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); |
ea2384d3 | 157 | if (device_name[0] != '\0') { |
1b7bdbc1 | 158 | QTAILQ_INSERT_TAIL(&bdrv_states, bs, list); |
ea2384d3 | 159 | } |
b338082b FB |
160 | return bs; |
161 | } | |
162 | ||
ea2384d3 FB |
163 | BlockDriver *bdrv_find_format(const char *format_name) |
164 | { | |
165 | BlockDriver *drv1; | |
8a22f02a SH |
166 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
167 | if (!strcmp(drv1->format_name, format_name)) { | |
ea2384d3 | 168 | return drv1; |
8a22f02a | 169 | } |
ea2384d3 FB |
170 | } |
171 | return NULL; | |
172 | } | |
173 | ||
eb852011 MA |
174 | static int bdrv_is_whitelisted(BlockDriver *drv) |
175 | { | |
176 | static const char *whitelist[] = { | |
177 | CONFIG_BDRV_WHITELIST | |
178 | }; | |
179 | const char **p; | |
180 | ||
181 | if (!whitelist[0]) | |
182 | return 1; /* no whitelist, anything goes */ | |
183 | ||
184 | for (p = whitelist; *p; p++) { | |
185 | if (!strcmp(drv->format_name, *p)) { | |
186 | return 1; | |
187 | } | |
188 | } | |
189 | return 0; | |
190 | } | |
191 | ||
192 | BlockDriver *bdrv_find_whitelisted_format(const char *format_name) | |
193 | { | |
194 | BlockDriver *drv = bdrv_find_format(format_name); | |
195 | return drv && bdrv_is_whitelisted(drv) ? drv : NULL; | |
196 | } | |
197 | ||
0e7e1989 KW |
198 | int bdrv_create(BlockDriver *drv, const char* filename, |
199 | QEMUOptionParameter *options) | |
ea2384d3 FB |
200 | { |
201 | if (!drv->bdrv_create) | |
202 | return -ENOTSUP; | |
0e7e1989 KW |
203 | |
204 | return drv->bdrv_create(filename, options); | |
ea2384d3 FB |
205 | } |
206 | ||
84a12e66 CH |
207 | int bdrv_create_file(const char* filename, QEMUOptionParameter *options) |
208 | { | |
209 | BlockDriver *drv; | |
210 | ||
211 | drv = find_protocol(filename); | |
212 | if (drv == NULL) { | |
213 | drv = bdrv_find_format("file"); | |
214 | } | |
215 | ||
216 | return bdrv_create(drv, filename, options); | |
217 | } | |
218 | ||
d5249393 | 219 | #ifdef _WIN32 |
95389c86 | 220 | void get_tmp_filename(char *filename, int size) |
d5249393 | 221 | { |
3b9f94e1 | 222 | char temp_dir[MAX_PATH]; |
3b46e624 | 223 | |
3b9f94e1 FB |
224 | GetTempPath(MAX_PATH, temp_dir); |
225 | GetTempFileName(temp_dir, "qem", 0, filename); | |
d5249393 FB |
226 | } |
227 | #else | |
95389c86 | 228 | void get_tmp_filename(char *filename, int size) |
fc01f7e7 | 229 | { |
67b915a5 | 230 | int fd; |
7ccfb2eb | 231 | const char *tmpdir; |
d5249393 | 232 | /* XXX: race condition possible */ |
0badc1ee AJ |
233 | tmpdir = getenv("TMPDIR"); |
234 | if (!tmpdir) | |
235 | tmpdir = "/tmp"; | |
236 | snprintf(filename, size, "%s/vl.XXXXXX", tmpdir); | |
ea2384d3 FB |
237 | fd = mkstemp(filename); |
238 | close(fd); | |
239 | } | |
d5249393 | 240 | #endif |
fc01f7e7 | 241 | |
19cb3738 | 242 | #ifdef _WIN32 |
f45512fe FB |
243 | static int is_windows_drive_prefix(const char *filename) |
244 | { | |
245 | return (((filename[0] >= 'a' && filename[0] <= 'z') || | |
246 | (filename[0] >= 'A' && filename[0] <= 'Z')) && | |
247 | filename[1] == ':'); | |
248 | } | |
3b46e624 | 249 | |
508c7cb3 | 250 | int is_windows_drive(const char *filename) |
19cb3738 | 251 | { |
5fafdf24 | 252 | if (is_windows_drive_prefix(filename) && |
f45512fe | 253 | filename[2] == '\0') |
19cb3738 FB |
254 | return 1; |
255 | if (strstart(filename, "\\\\.\\", NULL) || | |
256 | strstart(filename, "//./", NULL)) | |
257 | return 1; | |
258 | return 0; | |
259 | } | |
260 | #endif | |
261 | ||
84a12e66 CH |
262 | /* |
263 | * Detect host devices. By convention, /dev/cdrom[N] is always | |
264 | * recognized as a host CDROM. | |
265 | */ | |
266 | static BlockDriver *find_hdev_driver(const char *filename) | |
267 | { | |
268 | int score_max = 0, score; | |
269 | BlockDriver *drv = NULL, *d; | |
270 | ||
271 | QLIST_FOREACH(d, &bdrv_drivers, list) { | |
272 | if (d->bdrv_probe_device) { | |
273 | score = d->bdrv_probe_device(filename); | |
274 | if (score > score_max) { | |
275 | score_max = score; | |
276 | drv = d; | |
277 | } | |
278 | } | |
279 | } | |
280 | ||
281 | return drv; | |
282 | } | |
283 | ||
83f64091 FB |
284 | static BlockDriver *find_protocol(const char *filename) |
285 | { | |
286 | BlockDriver *drv1; | |
287 | char protocol[128]; | |
1cec71e3 | 288 | int len; |
83f64091 | 289 | const char *p; |
19cb3738 | 290 | |
66f82cee KW |
291 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ |
292 | ||
19cb3738 | 293 | #ifdef _WIN32 |
f45512fe FB |
294 | if (is_windows_drive(filename) || |
295 | is_windows_drive_prefix(filename)) | |
84a12e66 | 296 | return bdrv_find_format("file"); |
19cb3738 | 297 | #endif |
1cec71e3 | 298 | p = strchr(filename, ':'); |
84a12e66 CH |
299 | if (!p) { |
300 | drv1 = find_hdev_driver(filename); | |
301 | if (!drv1) { | |
302 | drv1 = bdrv_find_format("file"); | |
303 | } | |
304 | return drv1; | |
305 | } | |
1cec71e3 AL |
306 | len = p - filename; |
307 | if (len > sizeof(protocol) - 1) | |
308 | len = sizeof(protocol) - 1; | |
309 | memcpy(protocol, filename, len); | |
310 | protocol[len] = '\0'; | |
8a22f02a | 311 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
5fafdf24 | 312 | if (drv1->protocol_name && |
8a22f02a | 313 | !strcmp(drv1->protocol_name, protocol)) { |
83f64091 | 314 | return drv1; |
8a22f02a | 315 | } |
83f64091 FB |
316 | } |
317 | return NULL; | |
318 | } | |
319 | ||
f3a5d3f8 CH |
320 | static BlockDriver *find_image_format(const char *filename) |
321 | { | |
322 | int ret, score, score_max; | |
323 | BlockDriver *drv1, *drv; | |
324 | uint8_t buf[2048]; | |
325 | BlockDriverState *bs; | |
326 | ||
83f64091 | 327 | drv = find_protocol(filename); |
19cb3738 | 328 | /* no need to test disk image formats for vvfat */ |
c833ab73 | 329 | if (drv && strcmp(drv->format_name, "vvfat") == 0) |
83f64091 | 330 | return drv; |
19cb3738 | 331 | |
f5edb014 | 332 | ret = bdrv_file_open(&bs, filename, 0); |
83f64091 FB |
333 | if (ret < 0) |
334 | return NULL; | |
335 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); | |
336 | bdrv_delete(bs); | |
337 | if (ret < 0) { | |
338 | return NULL; | |
339 | } | |
340 | ||
ea2384d3 | 341 | score_max = 0; |
84a12e66 | 342 | drv = NULL; |
8a22f02a | 343 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
83f64091 FB |
344 | if (drv1->bdrv_probe) { |
345 | score = drv1->bdrv_probe(buf, ret, filename); | |
346 | if (score > score_max) { | |
347 | score_max = score; | |
348 | drv = drv1; | |
349 | } | |
0849bf08 | 350 | } |
fc01f7e7 | 351 | } |
ea2384d3 FB |
352 | return drv; |
353 | } | |
354 | ||
51762288 SH |
355 | /** |
356 | * Set the current 'total_sectors' value | |
357 | */ | |
358 | static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) | |
359 | { | |
360 | BlockDriver *drv = bs->drv; | |
361 | ||
362 | /* query actual device if possible, otherwise just trust the hint */ | |
363 | if (drv->bdrv_getlength) { | |
364 | int64_t length = drv->bdrv_getlength(bs); | |
365 | if (length < 0) { | |
366 | return length; | |
367 | } | |
368 | hint = length >> BDRV_SECTOR_BITS; | |
369 | } | |
370 | ||
371 | bs->total_sectors = hint; | |
372 | return 0; | |
373 | } | |
374 | ||
57915332 KW |
375 | /* |
376 | * Common part for opening disk images and files | |
377 | */ | |
378 | static int bdrv_open_common(BlockDriverState *bs, const char *filename, | |
379 | int flags, BlockDriver *drv) | |
380 | { | |
381 | int ret, open_flags; | |
382 | ||
383 | assert(drv != NULL); | |
384 | ||
66f82cee | 385 | bs->file = NULL; |
51762288 | 386 | bs->total_sectors = 0; |
57915332 KW |
387 | bs->is_temporary = 0; |
388 | bs->encrypted = 0; | |
389 | bs->valid_key = 0; | |
390 | bs->open_flags = flags; | |
391 | /* buffer_alignment defaulted to 512, drivers can change this value */ | |
392 | bs->buffer_alignment = 512; | |
393 | ||
394 | pstrcpy(bs->filename, sizeof(bs->filename), filename); | |
395 | ||
396 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) { | |
397 | return -ENOTSUP; | |
398 | } | |
399 | ||
400 | bs->drv = drv; | |
401 | bs->opaque = qemu_mallocz(drv->instance_size); | |
402 | ||
403 | /* | |
404 | * Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a | |
405 | * write cache to the guest. We do need the fdatasync to flush | |
406 | * out transactions for block allocations, and we maybe have a | |
407 | * volatile write cache in our backing device to deal with. | |
408 | */ | |
409 | if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE)) | |
410 | bs->enable_write_cache = 1; | |
411 | ||
412 | /* | |
413 | * Clear flags that are internal to the block layer before opening the | |
414 | * image. | |
415 | */ | |
416 | open_flags = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
417 | ||
418 | /* | |
419 | * Snapshots should be writeable. | |
420 | */ | |
421 | if (bs->is_temporary) { | |
422 | open_flags |= BDRV_O_RDWR; | |
423 | } | |
424 | ||
66f82cee KW |
425 | /* Open the image, either directly or using a protocol */ |
426 | if (drv->bdrv_file_open) { | |
427 | ret = drv->bdrv_file_open(bs, filename, open_flags); | |
428 | } else { | |
429 | ret = bdrv_file_open(&bs->file, filename, open_flags); | |
430 | if (ret >= 0) { | |
431 | ret = drv->bdrv_open(bs, open_flags); | |
432 | } | |
433 | } | |
434 | ||
57915332 KW |
435 | if (ret < 0) { |
436 | goto free_and_fail; | |
437 | } | |
438 | ||
439 | bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR); | |
51762288 SH |
440 | |
441 | ret = refresh_total_sectors(bs, bs->total_sectors); | |
442 | if (ret < 0) { | |
443 | goto free_and_fail; | |
57915332 | 444 | } |
51762288 | 445 | |
57915332 KW |
446 | #ifndef _WIN32 |
447 | if (bs->is_temporary) { | |
448 | unlink(filename); | |
449 | } | |
450 | #endif | |
451 | return 0; | |
452 | ||
453 | free_and_fail: | |
66f82cee KW |
454 | if (bs->file) { |
455 | bdrv_delete(bs->file); | |
456 | bs->file = NULL; | |
457 | } | |
57915332 KW |
458 | qemu_free(bs->opaque); |
459 | bs->opaque = NULL; | |
460 | bs->drv = NULL; | |
461 | return ret; | |
462 | } | |
463 | ||
b6ce07aa KW |
464 | /* |
465 | * Opens a file using a protocol (file, host_device, nbd, ...) | |
466 | */ | |
83f64091 | 467 | int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
ea2384d3 | 468 | { |
83f64091 | 469 | BlockDriverState *bs; |
6db95603 | 470 | BlockDriver *drv; |
83f64091 FB |
471 | int ret; |
472 | ||
6db95603 CH |
473 | drv = find_protocol(filename); |
474 | if (!drv) { | |
475 | return -ENOENT; | |
476 | } | |
477 | ||
83f64091 | 478 | bs = bdrv_new(""); |
b6ce07aa | 479 | ret = bdrv_open_common(bs, filename, flags, drv); |
83f64091 FB |
480 | if (ret < 0) { |
481 | bdrv_delete(bs); | |
482 | return ret; | |
3b0d4f61 | 483 | } |
71d0770c | 484 | bs->growable = 1; |
83f64091 FB |
485 | *pbs = bs; |
486 | return 0; | |
487 | } | |
488 | ||
b6ce07aa KW |
489 | /* |
490 | * Opens a disk image (raw, qcow2, vmdk, ...) | |
491 | */ | |
d6e9098e KW |
492 | int bdrv_open(BlockDriverState *bs, const char *filename, int flags, |
493 | BlockDriver *drv) | |
ea2384d3 | 494 | { |
b6ce07aa | 495 | int ret; |
712e7874 | 496 | |
83f64091 | 497 | if (flags & BDRV_O_SNAPSHOT) { |
ea2384d3 FB |
498 | BlockDriverState *bs1; |
499 | int64_t total_size; | |
7c96d46e | 500 | int is_protocol = 0; |
91a073a9 KW |
501 | BlockDriver *bdrv_qcow2; |
502 | QEMUOptionParameter *options; | |
b6ce07aa KW |
503 | char tmp_filename[PATH_MAX]; |
504 | char backing_filename[PATH_MAX]; | |
3b46e624 | 505 | |
ea2384d3 FB |
506 | /* if snapshot, we create a temporary backing file and open it |
507 | instead of opening 'filename' directly */ | |
33e3963e | 508 | |
ea2384d3 FB |
509 | /* if there is a backing file, use it */ |
510 | bs1 = bdrv_new(""); | |
d6e9098e | 511 | ret = bdrv_open(bs1, filename, 0, drv); |
51d7c00c | 512 | if (ret < 0) { |
ea2384d3 | 513 | bdrv_delete(bs1); |
51d7c00c | 514 | return ret; |
ea2384d3 | 515 | } |
6ea44308 | 516 | total_size = bdrv_getlength(bs1) >> BDRV_SECTOR_BITS; |
7c96d46e AL |
517 | |
518 | if (bs1->drv && bs1->drv->protocol_name) | |
519 | is_protocol = 1; | |
520 | ||
ea2384d3 | 521 | bdrv_delete(bs1); |
3b46e624 | 522 | |
ea2384d3 | 523 | get_tmp_filename(tmp_filename, sizeof(tmp_filename)); |
7c96d46e AL |
524 | |
525 | /* Real path is meaningless for protocols */ | |
526 | if (is_protocol) | |
527 | snprintf(backing_filename, sizeof(backing_filename), | |
528 | "%s", filename); | |
114cdfa9 KS |
529 | else if (!realpath(filename, backing_filename)) |
530 | return -errno; | |
7c96d46e | 531 | |
91a073a9 KW |
532 | bdrv_qcow2 = bdrv_find_format("qcow2"); |
533 | options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); | |
534 | ||
535 | set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size * 512); | |
536 | set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); | |
537 | if (drv) { | |
538 | set_option_parameter(options, BLOCK_OPT_BACKING_FMT, | |
539 | drv->format_name); | |
540 | } | |
541 | ||
542 | ret = bdrv_create(bdrv_qcow2, tmp_filename, options); | |
51d7c00c AL |
543 | if (ret < 0) { |
544 | return ret; | |
ea2384d3 | 545 | } |
91a073a9 | 546 | |
ea2384d3 | 547 | filename = tmp_filename; |
91a073a9 | 548 | drv = bdrv_qcow2; |
ea2384d3 FB |
549 | bs->is_temporary = 1; |
550 | } | |
712e7874 | 551 | |
b6ce07aa | 552 | /* Find the right image format driver */ |
6db95603 | 553 | if (!drv) { |
84a12e66 | 554 | drv = find_image_format(filename); |
51d7c00c | 555 | } |
6987307c | 556 | |
51d7c00c AL |
557 | if (!drv) { |
558 | ret = -ENOENT; | |
559 | goto unlink_and_fail; | |
ea2384d3 | 560 | } |
b6ce07aa KW |
561 | |
562 | /* Open the image */ | |
563 | ret = bdrv_open_common(bs, filename, flags, drv); | |
564 | if (ret < 0) { | |
6987307c CH |
565 | goto unlink_and_fail; |
566 | } | |
567 | ||
b6ce07aa KW |
568 | /* If there is a backing file, use it */ |
569 | if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') { | |
570 | char backing_filename[PATH_MAX]; | |
571 | int back_flags; | |
572 | BlockDriver *back_drv = NULL; | |
573 | ||
574 | bs->backing_hd = bdrv_new(""); | |
575 | path_combine(backing_filename, sizeof(backing_filename), | |
576 | filename, bs->backing_file); | |
577 | if (bs->backing_format[0] != '\0') | |
578 | back_drv = bdrv_find_format(bs->backing_format); | |
579 | ||
580 | /* backing files always opened read-only */ | |
581 | back_flags = | |
582 | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
583 | ||
584 | ret = bdrv_open(bs->backing_hd, backing_filename, back_flags, back_drv); | |
585 | if (ret < 0) { | |
586 | bdrv_close(bs); | |
587 | return ret; | |
588 | } | |
589 | if (bs->is_temporary) { | |
590 | bs->backing_hd->keep_read_only = !(flags & BDRV_O_RDWR); | |
591 | } else { | |
592 | /* base image inherits from "parent" */ | |
593 | bs->backing_hd->keep_read_only = bs->keep_read_only; | |
594 | } | |
595 | } | |
596 | ||
597 | if (!bdrv_key_required(bs)) { | |
598 | /* call the change callback */ | |
599 | bs->media_changed = 1; | |
600 | if (bs->change_cb) | |
601 | bs->change_cb(bs->change_opaque); | |
602 | } | |
603 | ||
604 | return 0; | |
605 | ||
606 | unlink_and_fail: | |
607 | if (bs->is_temporary) { | |
608 | unlink(filename); | |
609 | } | |
610 | return ret; | |
611 | } | |
612 | ||
fc01f7e7 FB |
613 | void bdrv_close(BlockDriverState *bs) |
614 | { | |
19cb3738 | 615 | if (bs->drv) { |
557df6ac | 616 | if (bs->backing_hd) { |
ea2384d3 | 617 | bdrv_delete(bs->backing_hd); |
557df6ac SH |
618 | bs->backing_hd = NULL; |
619 | } | |
ea2384d3 FB |
620 | bs->drv->bdrv_close(bs); |
621 | qemu_free(bs->opaque); | |
622 | #ifdef _WIN32 | |
623 | if (bs->is_temporary) { | |
624 | unlink(bs->filename); | |
625 | } | |
67b915a5 | 626 | #endif |
ea2384d3 FB |
627 | bs->opaque = NULL; |
628 | bs->drv = NULL; | |
b338082b | 629 | |
66f82cee KW |
630 | if (bs->file != NULL) { |
631 | bdrv_close(bs->file); | |
632 | } | |
633 | ||
b338082b | 634 | /* call the change callback */ |
19cb3738 | 635 | bs->media_changed = 1; |
b338082b FB |
636 | if (bs->change_cb) |
637 | bs->change_cb(bs->change_opaque); | |
638 | } | |
639 | } | |
640 | ||
641 | void bdrv_delete(BlockDriverState *bs) | |
642 | { | |
1b7bdbc1 SH |
643 | /* remove from list, if necessary */ |
644 | if (bs->device_name[0] != '\0') { | |
645 | QTAILQ_REMOVE(&bdrv_states, bs, list); | |
646 | } | |
34c6f050 | 647 | |
b338082b | 648 | bdrv_close(bs); |
66f82cee KW |
649 | if (bs->file != NULL) { |
650 | bdrv_delete(bs->file); | |
651 | } | |
652 | ||
b338082b | 653 | qemu_free(bs); |
fc01f7e7 FB |
654 | } |
655 | ||
e97fc193 AL |
656 | /* |
657 | * Run consistency checks on an image | |
658 | * | |
659 | * Returns the number of errors or -errno when an internal error occurs | |
660 | */ | |
661 | int bdrv_check(BlockDriverState *bs) | |
662 | { | |
663 | if (bs->drv->bdrv_check == NULL) { | |
664 | return -ENOTSUP; | |
665 | } | |
666 | ||
667 | return bs->drv->bdrv_check(bs); | |
668 | } | |
669 | ||
33e3963e FB |
670 | /* commit COW file into the raw image */ |
671 | int bdrv_commit(BlockDriverState *bs) | |
672 | { | |
19cb3738 | 673 | BlockDriver *drv = bs->drv; |
83f64091 | 674 | int64_t i, total_sectors; |
4dca4b63 NS |
675 | int n, j, ro, open_flags; |
676 | int ret = 0, rw_ret = 0; | |
ea2384d3 | 677 | unsigned char sector[512]; |
4dca4b63 NS |
678 | char filename[1024]; |
679 | BlockDriverState *bs_rw, *bs_ro; | |
33e3963e | 680 | |
19cb3738 FB |
681 | if (!drv) |
682 | return -ENOMEDIUM; | |
4dca4b63 NS |
683 | |
684 | if (!bs->backing_hd) { | |
685 | return -ENOTSUP; | |
33e3963e FB |
686 | } |
687 | ||
4dca4b63 NS |
688 | if (bs->backing_hd->keep_read_only) { |
689 | return -EACCES; | |
690 | } | |
691 | ||
692 | ro = bs->backing_hd->read_only; | |
693 | strncpy(filename, bs->backing_hd->filename, sizeof(filename)); | |
694 | open_flags = bs->backing_hd->open_flags; | |
695 | ||
696 | if (ro) { | |
697 | /* re-open as RW */ | |
698 | bdrv_delete(bs->backing_hd); | |
699 | bs->backing_hd = NULL; | |
700 | bs_rw = bdrv_new(""); | |
d6e9098e | 701 | rw_ret = bdrv_open(bs_rw, filename, open_flags | BDRV_O_RDWR, NULL); |
4dca4b63 NS |
702 | if (rw_ret < 0) { |
703 | bdrv_delete(bs_rw); | |
704 | /* try to re-open read-only */ | |
705 | bs_ro = bdrv_new(""); | |
d6e9098e | 706 | ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, NULL); |
4dca4b63 NS |
707 | if (ret < 0) { |
708 | bdrv_delete(bs_ro); | |
709 | /* drive not functional anymore */ | |
710 | bs->drv = NULL; | |
711 | return ret; | |
712 | } | |
713 | bs->backing_hd = bs_ro; | |
714 | return rw_ret; | |
715 | } | |
716 | bs->backing_hd = bs_rw; | |
ea2384d3 | 717 | } |
33e3963e | 718 | |
6ea44308 | 719 | total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
83f64091 | 720 | for (i = 0; i < total_sectors;) { |
19cb3738 | 721 | if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { |
ea2384d3 FB |
722 | for(j = 0; j < n; j++) { |
723 | if (bdrv_read(bs, i, sector, 1) != 0) { | |
4dca4b63 NS |
724 | ret = -EIO; |
725 | goto ro_cleanup; | |
ea2384d3 FB |
726 | } |
727 | ||
728 | if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { | |
4dca4b63 NS |
729 | ret = -EIO; |
730 | goto ro_cleanup; | |
ea2384d3 FB |
731 | } |
732 | i++; | |
33e3963e | 733 | } |
ea2384d3 FB |
734 | } else { |
735 | i += n; | |
736 | } | |
33e3963e | 737 | } |
95389c86 | 738 | |
1d44952f CH |
739 | if (drv->bdrv_make_empty) { |
740 | ret = drv->bdrv_make_empty(bs); | |
741 | bdrv_flush(bs); | |
742 | } | |
95389c86 | 743 | |
3f5075ae CH |
744 | /* |
745 | * Make sure all data we wrote to the backing device is actually | |
746 | * stable on disk. | |
747 | */ | |
748 | if (bs->backing_hd) | |
749 | bdrv_flush(bs->backing_hd); | |
4dca4b63 NS |
750 | |
751 | ro_cleanup: | |
752 | ||
753 | if (ro) { | |
754 | /* re-open as RO */ | |
755 | bdrv_delete(bs->backing_hd); | |
756 | bs->backing_hd = NULL; | |
757 | bs_ro = bdrv_new(""); | |
d6e9098e | 758 | ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, NULL); |
4dca4b63 NS |
759 | if (ret < 0) { |
760 | bdrv_delete(bs_ro); | |
761 | /* drive not functional anymore */ | |
762 | bs->drv = NULL; | |
763 | return ret; | |
764 | } | |
765 | bs->backing_hd = bs_ro; | |
766 | bs->backing_hd->keep_read_only = 0; | |
767 | } | |
768 | ||
1d44952f | 769 | return ret; |
33e3963e FB |
770 | } |
771 | ||
756e6736 KW |
772 | /* |
773 | * Return values: | |
774 | * 0 - success | |
775 | * -EINVAL - backing format specified, but no file | |
776 | * -ENOSPC - can't update the backing file because no space is left in the | |
777 | * image file header | |
778 | * -ENOTSUP - format driver doesn't support changing the backing file | |
779 | */ | |
780 | int bdrv_change_backing_file(BlockDriverState *bs, | |
781 | const char *backing_file, const char *backing_fmt) | |
782 | { | |
783 | BlockDriver *drv = bs->drv; | |
784 | ||
785 | if (drv->bdrv_change_backing_file != NULL) { | |
786 | return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); | |
787 | } else { | |
788 | return -ENOTSUP; | |
789 | } | |
790 | } | |
791 | ||
71d0770c AL |
792 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
793 | size_t size) | |
794 | { | |
795 | int64_t len; | |
796 | ||
797 | if (!bdrv_is_inserted(bs)) | |
798 | return -ENOMEDIUM; | |
799 | ||
800 | if (bs->growable) | |
801 | return 0; | |
802 | ||
803 | len = bdrv_getlength(bs); | |
804 | ||
fbb7b4e0 KW |
805 | if (offset < 0) |
806 | return -EIO; | |
807 | ||
808 | if ((offset > len) || (len - offset < size)) | |
71d0770c AL |
809 | return -EIO; |
810 | ||
811 | return 0; | |
812 | } | |
813 | ||
814 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, | |
815 | int nb_sectors) | |
816 | { | |
999dec57 | 817 | return bdrv_check_byte_request(bs, sector_num * 512, nb_sectors * 512); |
71d0770c AL |
818 | } |
819 | ||
19cb3738 | 820 | /* return < 0 if error. See bdrv_write() for the return codes */ |
5fafdf24 | 821 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
822 | uint8_t *buf, int nb_sectors) |
823 | { | |
ea2384d3 FB |
824 | BlockDriver *drv = bs->drv; |
825 | ||
19cb3738 FB |
826 | if (!drv) |
827 | return -ENOMEDIUM; | |
71d0770c AL |
828 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
829 | return -EIO; | |
b338082b | 830 | |
eda578e5 | 831 | return drv->bdrv_read(bs, sector_num, buf, nb_sectors); |
fc01f7e7 FB |
832 | } |
833 | ||
7cd1e32a | 834 | static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num, |
a55eb92c | 835 | int nb_sectors, int dirty) |
7cd1e32a | 836 | { |
837 | int64_t start, end; | |
c6d22830 | 838 | unsigned long val, idx, bit; |
a55eb92c | 839 | |
6ea44308 | 840 | start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; |
c6d22830 | 841 | end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK; |
a55eb92c JK |
842 | |
843 | for (; start <= end; start++) { | |
c6d22830 JK |
844 | idx = start / (sizeof(unsigned long) * 8); |
845 | bit = start % (sizeof(unsigned long) * 8); | |
846 | val = bs->dirty_bitmap[idx]; | |
847 | if (dirty) { | |
aaa0eb75 LS |
848 | if (!(val & (1 << bit))) { |
849 | bs->dirty_count++; | |
850 | val |= 1 << bit; | |
851 | } | |
c6d22830 | 852 | } else { |
aaa0eb75 LS |
853 | if (val & (1 << bit)) { |
854 | bs->dirty_count--; | |
855 | val &= ~(1 << bit); | |
856 | } | |
c6d22830 JK |
857 | } |
858 | bs->dirty_bitmap[idx] = val; | |
7cd1e32a | 859 | } |
860 | } | |
861 | ||
5fafdf24 | 862 | /* Return < 0 if error. Important errors are: |
19cb3738 FB |
863 | -EIO generic I/O error (may happen for all errors) |
864 | -ENOMEDIUM No media inserted. | |
865 | -EINVAL Invalid sector number or nb_sectors | |
866 | -EACCES Trying to write a read-only device | |
867 | */ | |
5fafdf24 | 868 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
869 | const uint8_t *buf, int nb_sectors) |
870 | { | |
83f64091 | 871 | BlockDriver *drv = bs->drv; |
19cb3738 FB |
872 | if (!bs->drv) |
873 | return -ENOMEDIUM; | |
0849bf08 | 874 | if (bs->read_only) |
19cb3738 | 875 | return -EACCES; |
71d0770c AL |
876 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
877 | return -EIO; | |
a55eb92c | 878 | |
c6d22830 | 879 | if (bs->dirty_bitmap) { |
7cd1e32a | 880 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
881 | } | |
a55eb92c | 882 | |
42fb2807 | 883 | return drv->bdrv_write(bs, sector_num, buf, nb_sectors); |
83f64091 FB |
884 | } |
885 | ||
eda578e5 AL |
886 | int bdrv_pread(BlockDriverState *bs, int64_t offset, |
887 | void *buf, int count1) | |
83f64091 | 888 | { |
6ea44308 | 889 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
890 | int len, nb_sectors, count; |
891 | int64_t sector_num; | |
9a8c4cce | 892 | int ret; |
83f64091 FB |
893 | |
894 | count = count1; | |
895 | /* first read to align to sector start */ | |
6ea44308 | 896 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
897 | if (len > count) |
898 | len = count; | |
6ea44308 | 899 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 900 | if (len > 0) { |
9a8c4cce KW |
901 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
902 | return ret; | |
6ea44308 | 903 | memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len); |
83f64091 FB |
904 | count -= len; |
905 | if (count == 0) | |
906 | return count1; | |
907 | sector_num++; | |
908 | buf += len; | |
909 | } | |
910 | ||
911 | /* read the sectors "in place" */ | |
6ea44308 | 912 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 913 | if (nb_sectors > 0) { |
9a8c4cce KW |
914 | if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0) |
915 | return ret; | |
83f64091 | 916 | sector_num += nb_sectors; |
6ea44308 | 917 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
918 | buf += len; |
919 | count -= len; | |
920 | } | |
921 | ||
922 | /* add data from the last sector */ | |
923 | if (count > 0) { | |
9a8c4cce KW |
924 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
925 | return ret; | |
83f64091 FB |
926 | memcpy(buf, tmp_buf, count); |
927 | } | |
928 | return count1; | |
929 | } | |
930 | ||
eda578e5 AL |
931 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, |
932 | const void *buf, int count1) | |
83f64091 | 933 | { |
6ea44308 | 934 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
935 | int len, nb_sectors, count; |
936 | int64_t sector_num; | |
9a8c4cce | 937 | int ret; |
83f64091 FB |
938 | |
939 | count = count1; | |
940 | /* first write to align to sector start */ | |
6ea44308 | 941 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
942 | if (len > count) |
943 | len = count; | |
6ea44308 | 944 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 945 | if (len > 0) { |
9a8c4cce KW |
946 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
947 | return ret; | |
6ea44308 | 948 | memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len); |
9a8c4cce KW |
949 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
950 | return ret; | |
83f64091 FB |
951 | count -= len; |
952 | if (count == 0) | |
953 | return count1; | |
954 | sector_num++; | |
955 | buf += len; | |
956 | } | |
957 | ||
958 | /* write the sectors "in place" */ | |
6ea44308 | 959 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 960 | if (nb_sectors > 0) { |
9a8c4cce KW |
961 | if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0) |
962 | return ret; | |
83f64091 | 963 | sector_num += nb_sectors; |
6ea44308 | 964 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
965 | buf += len; |
966 | count -= len; | |
967 | } | |
968 | ||
969 | /* add data from the last sector */ | |
970 | if (count > 0) { | |
9a8c4cce KW |
971 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
972 | return ret; | |
83f64091 | 973 | memcpy(tmp_buf, buf, count); |
9a8c4cce KW |
974 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
975 | return ret; | |
83f64091 FB |
976 | } |
977 | return count1; | |
978 | } | |
83f64091 | 979 | |
83f64091 FB |
980 | /** |
981 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
982 | */ | |
983 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
984 | { | |
985 | BlockDriver *drv = bs->drv; | |
51762288 | 986 | int ret; |
83f64091 | 987 | if (!drv) |
19cb3738 | 988 | return -ENOMEDIUM; |
83f64091 FB |
989 | if (!drv->bdrv_truncate) |
990 | return -ENOTSUP; | |
59f2689d NS |
991 | if (bs->read_only) |
992 | return -EACCES; | |
51762288 SH |
993 | ret = drv->bdrv_truncate(bs, offset); |
994 | if (ret == 0) { | |
995 | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); | |
996 | } | |
997 | return ret; | |
83f64091 FB |
998 | } |
999 | ||
1000 | /** | |
1001 | * Length of a file in bytes. Return < 0 if error or unknown. | |
1002 | */ | |
1003 | int64_t bdrv_getlength(BlockDriverState *bs) | |
1004 | { | |
1005 | BlockDriver *drv = bs->drv; | |
1006 | if (!drv) | |
19cb3738 | 1007 | return -ENOMEDIUM; |
51762288 SH |
1008 | |
1009 | /* Fixed size devices use the total_sectors value for speed instead of | |
1010 | issuing a length query (like lseek) on each call. Also, legacy block | |
1011 | drivers don't provide a bdrv_getlength function and must use | |
1012 | total_sectors. */ | |
1013 | if (!bs->growable || !drv->bdrv_getlength) { | |
6ea44308 | 1014 | return bs->total_sectors * BDRV_SECTOR_SIZE; |
83f64091 FB |
1015 | } |
1016 | return drv->bdrv_getlength(bs); | |
fc01f7e7 FB |
1017 | } |
1018 | ||
19cb3738 | 1019 | /* return 0 as number of sectors if no device present or error */ |
96b8f136 | 1020 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
fc01f7e7 | 1021 | { |
19cb3738 FB |
1022 | int64_t length; |
1023 | length = bdrv_getlength(bs); | |
1024 | if (length < 0) | |
1025 | length = 0; | |
1026 | else | |
6ea44308 | 1027 | length = length >> BDRV_SECTOR_BITS; |
19cb3738 | 1028 | *nb_sectors_ptr = length; |
fc01f7e7 | 1029 | } |
cf98951b | 1030 | |
f3d54fc4 AL |
1031 | struct partition { |
1032 | uint8_t boot_ind; /* 0x80 - active */ | |
1033 | uint8_t head; /* starting head */ | |
1034 | uint8_t sector; /* starting sector */ | |
1035 | uint8_t cyl; /* starting cylinder */ | |
1036 | uint8_t sys_ind; /* What partition type */ | |
1037 | uint8_t end_head; /* end head */ | |
1038 | uint8_t end_sector; /* end sector */ | |
1039 | uint8_t end_cyl; /* end cylinder */ | |
1040 | uint32_t start_sect; /* starting sector counting from 0 */ | |
1041 | uint32_t nr_sects; /* nr of sectors in partition */ | |
1042 | } __attribute__((packed)); | |
1043 | ||
1044 | /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */ | |
1045 | static int guess_disk_lchs(BlockDriverState *bs, | |
1046 | int *pcylinders, int *pheads, int *psectors) | |
1047 | { | |
1048 | uint8_t buf[512]; | |
1049 | int ret, i, heads, sectors, cylinders; | |
1050 | struct partition *p; | |
1051 | uint32_t nr_sects; | |
a38131b6 | 1052 | uint64_t nb_sectors; |
f3d54fc4 AL |
1053 | |
1054 | bdrv_get_geometry(bs, &nb_sectors); | |
1055 | ||
1056 | ret = bdrv_read(bs, 0, buf, 1); | |
1057 | if (ret < 0) | |
1058 | return -1; | |
1059 | /* test msdos magic */ | |
1060 | if (buf[510] != 0x55 || buf[511] != 0xaa) | |
1061 | return -1; | |
1062 | for(i = 0; i < 4; i++) { | |
1063 | p = ((struct partition *)(buf + 0x1be)) + i; | |
1064 | nr_sects = le32_to_cpu(p->nr_sects); | |
1065 | if (nr_sects && p->end_head) { | |
1066 | /* We make the assumption that the partition terminates on | |
1067 | a cylinder boundary */ | |
1068 | heads = p->end_head + 1; | |
1069 | sectors = p->end_sector & 63; | |
1070 | if (sectors == 0) | |
1071 | continue; | |
1072 | cylinders = nb_sectors / (heads * sectors); | |
1073 | if (cylinders < 1 || cylinders > 16383) | |
1074 | continue; | |
1075 | *pheads = heads; | |
1076 | *psectors = sectors; | |
1077 | *pcylinders = cylinders; | |
1078 | #if 0 | |
1079 | printf("guessed geometry: LCHS=%d %d %d\n", | |
1080 | cylinders, heads, sectors); | |
1081 | #endif | |
1082 | return 0; | |
1083 | } | |
1084 | } | |
1085 | return -1; | |
1086 | } | |
1087 | ||
1088 | void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) | |
1089 | { | |
1090 | int translation, lba_detected = 0; | |
1091 | int cylinders, heads, secs; | |
a38131b6 | 1092 | uint64_t nb_sectors; |
f3d54fc4 AL |
1093 | |
1094 | /* if a geometry hint is available, use it */ | |
1095 | bdrv_get_geometry(bs, &nb_sectors); | |
1096 | bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); | |
1097 | translation = bdrv_get_translation_hint(bs); | |
1098 | if (cylinders != 0) { | |
1099 | *pcyls = cylinders; | |
1100 | *pheads = heads; | |
1101 | *psecs = secs; | |
1102 | } else { | |
1103 | if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { | |
1104 | if (heads > 16) { | |
1105 | /* if heads > 16, it means that a BIOS LBA | |
1106 | translation was active, so the default | |
1107 | hardware geometry is OK */ | |
1108 | lba_detected = 1; | |
1109 | goto default_geometry; | |
1110 | } else { | |
1111 | *pcyls = cylinders; | |
1112 | *pheads = heads; | |
1113 | *psecs = secs; | |
1114 | /* disable any translation to be in sync with | |
1115 | the logical geometry */ | |
1116 | if (translation == BIOS_ATA_TRANSLATION_AUTO) { | |
1117 | bdrv_set_translation_hint(bs, | |
1118 | BIOS_ATA_TRANSLATION_NONE); | |
1119 | } | |
1120 | } | |
1121 | } else { | |
1122 | default_geometry: | |
1123 | /* if no geometry, use a standard physical disk geometry */ | |
1124 | cylinders = nb_sectors / (16 * 63); | |
1125 | ||
1126 | if (cylinders > 16383) | |
1127 | cylinders = 16383; | |
1128 | else if (cylinders < 2) | |
1129 | cylinders = 2; | |
1130 | *pcyls = cylinders; | |
1131 | *pheads = 16; | |
1132 | *psecs = 63; | |
1133 | if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { | |
1134 | if ((*pcyls * *pheads) <= 131072) { | |
1135 | bdrv_set_translation_hint(bs, | |
1136 | BIOS_ATA_TRANSLATION_LARGE); | |
1137 | } else { | |
1138 | bdrv_set_translation_hint(bs, | |
1139 | BIOS_ATA_TRANSLATION_LBA); | |
1140 | } | |
1141 | } | |
1142 | } | |
1143 | bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); | |
1144 | } | |
1145 | } | |
1146 | ||
5fafdf24 | 1147 | void bdrv_set_geometry_hint(BlockDriverState *bs, |
b338082b FB |
1148 | int cyls, int heads, int secs) |
1149 | { | |
1150 | bs->cyls = cyls; | |
1151 | bs->heads = heads; | |
1152 | bs->secs = secs; | |
1153 | } | |
1154 | ||
1155 | void bdrv_set_type_hint(BlockDriverState *bs, int type) | |
1156 | { | |
1157 | bs->type = type; | |
1158 | bs->removable = ((type == BDRV_TYPE_CDROM || | |
1159 | type == BDRV_TYPE_FLOPPY)); | |
1160 | } | |
1161 | ||
46d4767d FB |
1162 | void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
1163 | { | |
1164 | bs->translation = translation; | |
1165 | } | |
1166 | ||
5fafdf24 | 1167 | void bdrv_get_geometry_hint(BlockDriverState *bs, |
b338082b FB |
1168 | int *pcyls, int *pheads, int *psecs) |
1169 | { | |
1170 | *pcyls = bs->cyls; | |
1171 | *pheads = bs->heads; | |
1172 | *psecs = bs->secs; | |
1173 | } | |
1174 | ||
1175 | int bdrv_get_type_hint(BlockDriverState *bs) | |
1176 | { | |
1177 | return bs->type; | |
1178 | } | |
1179 | ||
46d4767d FB |
1180 | int bdrv_get_translation_hint(BlockDriverState *bs) |
1181 | { | |
1182 | return bs->translation; | |
1183 | } | |
1184 | ||
b338082b FB |
1185 | int bdrv_is_removable(BlockDriverState *bs) |
1186 | { | |
1187 | return bs->removable; | |
1188 | } | |
1189 | ||
1190 | int bdrv_is_read_only(BlockDriverState *bs) | |
1191 | { | |
1192 | return bs->read_only; | |
1193 | } | |
1194 | ||
985a03b0 TS |
1195 | int bdrv_is_sg(BlockDriverState *bs) |
1196 | { | |
1197 | return bs->sg; | |
1198 | } | |
1199 | ||
e900a7b7 CH |
1200 | int bdrv_enable_write_cache(BlockDriverState *bs) |
1201 | { | |
1202 | return bs->enable_write_cache; | |
1203 | } | |
1204 | ||
19cb3738 | 1205 | /* XXX: no longer used */ |
5fafdf24 | 1206 | void bdrv_set_change_cb(BlockDriverState *bs, |
b338082b FB |
1207 | void (*change_cb)(void *opaque), void *opaque) |
1208 | { | |
1209 | bs->change_cb = change_cb; | |
1210 | bs->change_opaque = opaque; | |
1211 | } | |
1212 | ||
ea2384d3 FB |
1213 | int bdrv_is_encrypted(BlockDriverState *bs) |
1214 | { | |
1215 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
1216 | return 1; | |
1217 | return bs->encrypted; | |
1218 | } | |
1219 | ||
c0f4ce77 AL |
1220 | int bdrv_key_required(BlockDriverState *bs) |
1221 | { | |
1222 | BlockDriverState *backing_hd = bs->backing_hd; | |
1223 | ||
1224 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) | |
1225 | return 1; | |
1226 | return (bs->encrypted && !bs->valid_key); | |
1227 | } | |
1228 | ||
ea2384d3 FB |
1229 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
1230 | { | |
1231 | int ret; | |
1232 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
1233 | ret = bdrv_set_key(bs->backing_hd, key); | |
1234 | if (ret < 0) | |
1235 | return ret; | |
1236 | if (!bs->encrypted) | |
1237 | return 0; | |
1238 | } | |
fd04a2ae SH |
1239 | if (!bs->encrypted) { |
1240 | return -EINVAL; | |
1241 | } else if (!bs->drv || !bs->drv->bdrv_set_key) { | |
1242 | return -ENOMEDIUM; | |
1243 | } | |
c0f4ce77 | 1244 | ret = bs->drv->bdrv_set_key(bs, key); |
bb5fc20f AL |
1245 | if (ret < 0) { |
1246 | bs->valid_key = 0; | |
1247 | } else if (!bs->valid_key) { | |
1248 | bs->valid_key = 1; | |
1249 | /* call the change callback now, we skipped it on open */ | |
1250 | bs->media_changed = 1; | |
1251 | if (bs->change_cb) | |
1252 | bs->change_cb(bs->change_opaque); | |
1253 | } | |
c0f4ce77 | 1254 | return ret; |
ea2384d3 FB |
1255 | } |
1256 | ||
1257 | void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) | |
1258 | { | |
19cb3738 | 1259 | if (!bs->drv) { |
ea2384d3 FB |
1260 | buf[0] = '\0'; |
1261 | } else { | |
1262 | pstrcpy(buf, buf_size, bs->drv->format_name); | |
1263 | } | |
1264 | } | |
1265 | ||
5fafdf24 | 1266 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
ea2384d3 FB |
1267 | void *opaque) |
1268 | { | |
1269 | BlockDriver *drv; | |
1270 | ||
8a22f02a | 1271 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
ea2384d3 FB |
1272 | it(opaque, drv->format_name); |
1273 | } | |
1274 | } | |
1275 | ||
b338082b FB |
1276 | BlockDriverState *bdrv_find(const char *name) |
1277 | { | |
1278 | BlockDriverState *bs; | |
1279 | ||
1b7bdbc1 SH |
1280 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
1281 | if (!strcmp(name, bs->device_name)) { | |
b338082b | 1282 | return bs; |
1b7bdbc1 | 1283 | } |
b338082b FB |
1284 | } |
1285 | return NULL; | |
1286 | } | |
1287 | ||
51de9760 | 1288 | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
81d0912d FB |
1289 | { |
1290 | BlockDriverState *bs; | |
1291 | ||
1b7bdbc1 | 1292 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
51de9760 | 1293 | it(opaque, bs); |
81d0912d FB |
1294 | } |
1295 | } | |
1296 | ||
ea2384d3 FB |
1297 | const char *bdrv_get_device_name(BlockDriverState *bs) |
1298 | { | |
1299 | return bs->device_name; | |
1300 | } | |
1301 | ||
7a6cba61 PB |
1302 | void bdrv_flush(BlockDriverState *bs) |
1303 | { | |
3f5075ae | 1304 | if (bs->drv && bs->drv->bdrv_flush) |
7a6cba61 | 1305 | bs->drv->bdrv_flush(bs); |
7a6cba61 PB |
1306 | } |
1307 | ||
c6ca28d6 AL |
1308 | void bdrv_flush_all(void) |
1309 | { | |
1310 | BlockDriverState *bs; | |
1311 | ||
1b7bdbc1 SH |
1312 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
1313 | if (bs->drv && !bdrv_is_read_only(bs) && | |
1314 | (!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) { | |
c6ca28d6 | 1315 | bdrv_flush(bs); |
1b7bdbc1 SH |
1316 | } |
1317 | } | |
c6ca28d6 AL |
1318 | } |
1319 | ||
f2feebbd KW |
1320 | int bdrv_has_zero_init(BlockDriverState *bs) |
1321 | { | |
1322 | assert(bs->drv); | |
1323 | ||
1324 | if (bs->drv->no_zero_init) { | |
1325 | return 0; | |
1326 | } else if (bs->file) { | |
1327 | return bdrv_has_zero_init(bs->file); | |
1328 | } | |
1329 | ||
1330 | return 1; | |
1331 | } | |
1332 | ||
f58c7b35 TS |
1333 | /* |
1334 | * Returns true iff the specified sector is present in the disk image. Drivers | |
1335 | * not implementing the functionality are assumed to not support backing files, | |
1336 | * hence all their sectors are reported as allocated. | |
1337 | * | |
1338 | * 'pnum' is set to the number of sectors (including and immediately following | |
1339 | * the specified sector) that are known to be in the same | |
1340 | * allocated/unallocated state. | |
1341 | * | |
1342 | * 'nb_sectors' is the max value 'pnum' should be set to. | |
1343 | */ | |
1344 | int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, | |
1345 | int *pnum) | |
1346 | { | |
1347 | int64_t n; | |
1348 | if (!bs->drv->bdrv_is_allocated) { | |
1349 | if (sector_num >= bs->total_sectors) { | |
1350 | *pnum = 0; | |
1351 | return 0; | |
1352 | } | |
1353 | n = bs->total_sectors - sector_num; | |
1354 | *pnum = (n < nb_sectors) ? (n) : (nb_sectors); | |
1355 | return 1; | |
1356 | } | |
1357 | return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum); | |
1358 | } | |
1359 | ||
2582bfed LC |
1360 | void bdrv_mon_event(const BlockDriverState *bdrv, |
1361 | BlockMonEventAction action, int is_read) | |
1362 | { | |
1363 | QObject *data; | |
1364 | const char *action_str; | |
1365 | ||
1366 | switch (action) { | |
1367 | case BDRV_ACTION_REPORT: | |
1368 | action_str = "report"; | |
1369 | break; | |
1370 | case BDRV_ACTION_IGNORE: | |
1371 | action_str = "ignore"; | |
1372 | break; | |
1373 | case BDRV_ACTION_STOP: | |
1374 | action_str = "stop"; | |
1375 | break; | |
1376 | default: | |
1377 | abort(); | |
1378 | } | |
1379 | ||
1380 | data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }", | |
1381 | bdrv->device_name, | |
1382 | action_str, | |
1383 | is_read ? "read" : "write"); | |
1384 | monitor_protocol_event(QEVENT_BLOCK_IO_ERROR, data); | |
1385 | ||
1386 | qobject_decref(data); | |
1387 | } | |
1388 | ||
d15e5465 | 1389 | static void bdrv_print_dict(QObject *obj, void *opaque) |
b338082b | 1390 | { |
d15e5465 LC |
1391 | QDict *bs_dict; |
1392 | Monitor *mon = opaque; | |
1393 | ||
1394 | bs_dict = qobject_to_qdict(obj); | |
1395 | ||
1396 | monitor_printf(mon, "%s: type=%s removable=%d", | |
1397 | qdict_get_str(bs_dict, "device"), | |
1398 | qdict_get_str(bs_dict, "type"), | |
1399 | qdict_get_bool(bs_dict, "removable")); | |
1400 | ||
1401 | if (qdict_get_bool(bs_dict, "removable")) { | |
1402 | monitor_printf(mon, " locked=%d", qdict_get_bool(bs_dict, "locked")); | |
1403 | } | |
1404 | ||
1405 | if (qdict_haskey(bs_dict, "inserted")) { | |
1406 | QDict *qdict = qobject_to_qdict(qdict_get(bs_dict, "inserted")); | |
1407 | ||
1408 | monitor_printf(mon, " file="); | |
1409 | monitor_print_filename(mon, qdict_get_str(qdict, "file")); | |
1410 | if (qdict_haskey(qdict, "backing_file")) { | |
1411 | monitor_printf(mon, " backing_file="); | |
1412 | monitor_print_filename(mon, qdict_get_str(qdict, "backing_file")); | |
1413 | } | |
1414 | monitor_printf(mon, " ro=%d drv=%s encrypted=%d", | |
1415 | qdict_get_bool(qdict, "ro"), | |
1416 | qdict_get_str(qdict, "drv"), | |
1417 | qdict_get_bool(qdict, "encrypted")); | |
1418 | } else { | |
1419 | monitor_printf(mon, " [not inserted]"); | |
1420 | } | |
1421 | ||
1422 | monitor_printf(mon, "\n"); | |
1423 | } | |
1424 | ||
1425 | void bdrv_info_print(Monitor *mon, const QObject *data) | |
1426 | { | |
1427 | qlist_iter(qobject_to_qlist(data), bdrv_print_dict, mon); | |
1428 | } | |
1429 | ||
1430 | /** | |
1431 | * bdrv_info(): Block devices information | |
1432 | * | |
1433 | * Each block device information is stored in a QDict and the | |
1434 | * returned QObject is a QList of all devices. | |
1435 | * | |
1436 | * The QDict contains the following: | |
1437 | * | |
1438 | * - "device": device name | |
1439 | * - "type": device type | |
1440 | * - "removable": true if the device is removable, false otherwise | |
1441 | * - "locked": true if the device is locked, false otherwise | |
1442 | * - "inserted": only present if the device is inserted, it is a QDict | |
1443 | * containing the following: | |
1444 | * - "file": device file name | |
1445 | * - "ro": true if read-only, false otherwise | |
1446 | * - "drv": driver format name | |
1447 | * - "backing_file": backing file name if one is used | |
1448 | * - "encrypted": true if encrypted, false otherwise | |
1449 | * | |
1450 | * Example: | |
1451 | * | |
1452 | * [ { "device": "ide0-hd0", "type": "hd", "removable": false, "locked": false, | |
1453 | * "inserted": { "file": "/tmp/foobar", "ro": false, "drv": "qcow2" } }, | |
1454 | * { "device": "floppy0", "type": "floppy", "removable": true, | |
1455 | * "locked": false } ] | |
1456 | */ | |
1457 | void bdrv_info(Monitor *mon, QObject **ret_data) | |
1458 | { | |
1459 | QList *bs_list; | |
b338082b FB |
1460 | BlockDriverState *bs; |
1461 | ||
d15e5465 LC |
1462 | bs_list = qlist_new(); |
1463 | ||
1b7bdbc1 | 1464 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
d15e5465 LC |
1465 | QObject *bs_obj; |
1466 | const char *type = "unknown"; | |
1467 | ||
b338082b FB |
1468 | switch(bs->type) { |
1469 | case BDRV_TYPE_HD: | |
d15e5465 | 1470 | type = "hd"; |
b338082b FB |
1471 | break; |
1472 | case BDRV_TYPE_CDROM: | |
d15e5465 | 1473 | type = "cdrom"; |
b338082b FB |
1474 | break; |
1475 | case BDRV_TYPE_FLOPPY: | |
d15e5465 | 1476 | type = "floppy"; |
b338082b FB |
1477 | break; |
1478 | } | |
d15e5465 LC |
1479 | |
1480 | bs_obj = qobject_from_jsonf("{ 'device': %s, 'type': %s, " | |
1481 | "'removable': %i, 'locked': %i }", | |
1482 | bs->device_name, type, bs->removable, | |
1483 | bs->locked); | |
d15e5465 | 1484 | |
19cb3738 | 1485 | if (bs->drv) { |
d15e5465 LC |
1486 | QObject *obj; |
1487 | QDict *bs_dict = qobject_to_qdict(bs_obj); | |
1488 | ||
1489 | obj = qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, " | |
1490 | "'encrypted': %i }", | |
1491 | bs->filename, bs->read_only, | |
1492 | bs->drv->format_name, | |
1493 | bdrv_is_encrypted(bs)); | |
fef30743 | 1494 | if (bs->backing_file[0] != '\0') { |
d15e5465 LC |
1495 | QDict *qdict = qobject_to_qdict(obj); |
1496 | qdict_put(qdict, "backing_file", | |
1497 | qstring_from_str(bs->backing_file)); | |
376253ec | 1498 | } |
d15e5465 LC |
1499 | |
1500 | qdict_put_obj(bs_dict, "inserted", obj); | |
b338082b | 1501 | } |
d15e5465 | 1502 | qlist_append_obj(bs_list, bs_obj); |
b338082b | 1503 | } |
d15e5465 LC |
1504 | |
1505 | *ret_data = QOBJECT(bs_list); | |
b338082b | 1506 | } |
a36e69dd | 1507 | |
218a536a | 1508 | static void bdrv_stats_iter(QObject *data, void *opaque) |
a36e69dd | 1509 | { |
218a536a LC |
1510 | QDict *qdict; |
1511 | Monitor *mon = opaque; | |
1512 | ||
1513 | qdict = qobject_to_qdict(data); | |
1514 | monitor_printf(mon, "%s:", qdict_get_str(qdict, "device")); | |
1515 | ||
1516 | qdict = qobject_to_qdict(qdict_get(qdict, "stats")); | |
1517 | monitor_printf(mon, " rd_bytes=%" PRId64 | |
1518 | " wr_bytes=%" PRId64 | |
1519 | " rd_operations=%" PRId64 | |
1520 | " wr_operations=%" PRId64 | |
1521 | "\n", | |
1522 | qdict_get_int(qdict, "rd_bytes"), | |
1523 | qdict_get_int(qdict, "wr_bytes"), | |
1524 | qdict_get_int(qdict, "rd_operations"), | |
1525 | qdict_get_int(qdict, "wr_operations")); | |
1526 | } | |
1527 | ||
1528 | void bdrv_stats_print(Monitor *mon, const QObject *data) | |
1529 | { | |
1530 | qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon); | |
1531 | } | |
1532 | ||
1533 | /** | |
1534 | * bdrv_info_stats(): show block device statistics | |
1535 | * | |
1536 | * Each device statistic information is stored in a QDict and | |
1537 | * the returned QObject is a QList of all devices. | |
1538 | * | |
1539 | * The QDict contains the following: | |
1540 | * | |
1541 | * - "device": device name | |
1542 | * - "stats": A QDict with the statistics information, it contains: | |
1543 | * - "rd_bytes": bytes read | |
1544 | * - "wr_bytes": bytes written | |
1545 | * - "rd_operations": read operations | |
1546 | * - "wr_operations": write operations | |
1547 | * | |
1548 | * Example: | |
1549 | * | |
1550 | * [ { "device": "ide0-hd0", | |
1551 | * "stats": { "rd_bytes": 512, | |
1552 | * "wr_bytes": 0, | |
1553 | * "rd_operations": 1, | |
1554 | * "wr_operations": 0 } }, | |
1555 | * { "device": "ide1-cd0", | |
1556 | * "stats": { "rd_bytes": 0, | |
1557 | * "wr_bytes": 0, | |
1558 | * "rd_operations": 0, | |
1559 | * "wr_operations": 0 } } ] | |
1560 | */ | |
1561 | void bdrv_info_stats(Monitor *mon, QObject **ret_data) | |
1562 | { | |
1563 | QObject *obj; | |
1564 | QList *devices; | |
a36e69dd TS |
1565 | BlockDriverState *bs; |
1566 | ||
218a536a LC |
1567 | devices = qlist_new(); |
1568 | ||
1b7bdbc1 | 1569 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
218a536a LC |
1570 | obj = qobject_from_jsonf("{ 'device': %s, 'stats': {" |
1571 | "'rd_bytes': %" PRId64 "," | |
1572 | "'wr_bytes': %" PRId64 "," | |
1573 | "'rd_operations': %" PRId64 "," | |
1574 | "'wr_operations': %" PRId64 | |
1575 | "} }", | |
1576 | bs->device_name, | |
1577 | bs->rd_bytes, bs->wr_bytes, | |
1578 | bs->rd_ops, bs->wr_ops); | |
218a536a | 1579 | qlist_append_obj(devices, obj); |
a36e69dd | 1580 | } |
218a536a LC |
1581 | |
1582 | *ret_data = QOBJECT(devices); | |
a36e69dd | 1583 | } |
ea2384d3 | 1584 | |
045df330 AL |
1585 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
1586 | { | |
1587 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
1588 | return bs->backing_file; | |
1589 | else if (bs->encrypted) | |
1590 | return bs->filename; | |
1591 | else | |
1592 | return NULL; | |
1593 | } | |
1594 | ||
5fafdf24 | 1595 | void bdrv_get_backing_filename(BlockDriverState *bs, |
83f64091 FB |
1596 | char *filename, int filename_size) |
1597 | { | |
b783e409 | 1598 | if (!bs->backing_file) { |
83f64091 FB |
1599 | pstrcpy(filename, filename_size, ""); |
1600 | } else { | |
1601 | pstrcpy(filename, filename_size, bs->backing_file); | |
1602 | } | |
1603 | } | |
1604 | ||
5fafdf24 | 1605 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
faea38e7 FB |
1606 | const uint8_t *buf, int nb_sectors) |
1607 | { | |
1608 | BlockDriver *drv = bs->drv; | |
1609 | if (!drv) | |
19cb3738 | 1610 | return -ENOMEDIUM; |
faea38e7 FB |
1611 | if (!drv->bdrv_write_compressed) |
1612 | return -ENOTSUP; | |
fbb7b4e0 KW |
1613 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
1614 | return -EIO; | |
a55eb92c | 1615 | |
c6d22830 | 1616 | if (bs->dirty_bitmap) { |
7cd1e32a | 1617 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
1618 | } | |
a55eb92c | 1619 | |
faea38e7 FB |
1620 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
1621 | } | |
3b46e624 | 1622 | |
faea38e7 FB |
1623 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
1624 | { | |
1625 | BlockDriver *drv = bs->drv; | |
1626 | if (!drv) | |
19cb3738 | 1627 | return -ENOMEDIUM; |
faea38e7 FB |
1628 | if (!drv->bdrv_get_info) |
1629 | return -ENOTSUP; | |
1630 | memset(bdi, 0, sizeof(*bdi)); | |
1631 | return drv->bdrv_get_info(bs, bdi); | |
1632 | } | |
1633 | ||
45566e9c CH |
1634 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
1635 | int64_t pos, int size) | |
178e08a5 AL |
1636 | { |
1637 | BlockDriver *drv = bs->drv; | |
1638 | if (!drv) | |
1639 | return -ENOMEDIUM; | |
45566e9c | 1640 | if (!drv->bdrv_save_vmstate) |
178e08a5 | 1641 | return -ENOTSUP; |
45566e9c | 1642 | return drv->bdrv_save_vmstate(bs, buf, pos, size); |
178e08a5 AL |
1643 | } |
1644 | ||
45566e9c CH |
1645 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
1646 | int64_t pos, int size) | |
178e08a5 AL |
1647 | { |
1648 | BlockDriver *drv = bs->drv; | |
1649 | if (!drv) | |
1650 | return -ENOMEDIUM; | |
45566e9c | 1651 | if (!drv->bdrv_load_vmstate) |
178e08a5 | 1652 | return -ENOTSUP; |
45566e9c | 1653 | return drv->bdrv_load_vmstate(bs, buf, pos, size); |
178e08a5 AL |
1654 | } |
1655 | ||
8b9b0cc2 KW |
1656 | void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event) |
1657 | { | |
1658 | BlockDriver *drv = bs->drv; | |
1659 | ||
1660 | if (!drv || !drv->bdrv_debug_event) { | |
1661 | return; | |
1662 | } | |
1663 | ||
1664 | return drv->bdrv_debug_event(bs, event); | |
1665 | ||
1666 | } | |
1667 | ||
faea38e7 FB |
1668 | /**************************************************************/ |
1669 | /* handling of snapshots */ | |
1670 | ||
5fafdf24 | 1671 | int bdrv_snapshot_create(BlockDriverState *bs, |
faea38e7 FB |
1672 | QEMUSnapshotInfo *sn_info) |
1673 | { | |
1674 | BlockDriver *drv = bs->drv; | |
1675 | if (!drv) | |
19cb3738 | 1676 | return -ENOMEDIUM; |
faea38e7 FB |
1677 | if (!drv->bdrv_snapshot_create) |
1678 | return -ENOTSUP; | |
1679 | return drv->bdrv_snapshot_create(bs, sn_info); | |
1680 | } | |
1681 | ||
5fafdf24 | 1682 | int bdrv_snapshot_goto(BlockDriverState *bs, |
faea38e7 FB |
1683 | const char *snapshot_id) |
1684 | { | |
1685 | BlockDriver *drv = bs->drv; | |
1686 | if (!drv) | |
19cb3738 | 1687 | return -ENOMEDIUM; |
faea38e7 FB |
1688 | if (!drv->bdrv_snapshot_goto) |
1689 | return -ENOTSUP; | |
1690 | return drv->bdrv_snapshot_goto(bs, snapshot_id); | |
1691 | } | |
1692 | ||
1693 | int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) | |
1694 | { | |
1695 | BlockDriver *drv = bs->drv; | |
1696 | if (!drv) | |
19cb3738 | 1697 | return -ENOMEDIUM; |
faea38e7 FB |
1698 | if (!drv->bdrv_snapshot_delete) |
1699 | return -ENOTSUP; | |
1700 | return drv->bdrv_snapshot_delete(bs, snapshot_id); | |
1701 | } | |
1702 | ||
5fafdf24 | 1703 | int bdrv_snapshot_list(BlockDriverState *bs, |
faea38e7 FB |
1704 | QEMUSnapshotInfo **psn_info) |
1705 | { | |
1706 | BlockDriver *drv = bs->drv; | |
1707 | if (!drv) | |
19cb3738 | 1708 | return -ENOMEDIUM; |
faea38e7 FB |
1709 | if (!drv->bdrv_snapshot_list) |
1710 | return -ENOTSUP; | |
1711 | return drv->bdrv_snapshot_list(bs, psn_info); | |
1712 | } | |
1713 | ||
1714 | #define NB_SUFFIXES 4 | |
1715 | ||
1716 | char *get_human_readable_size(char *buf, int buf_size, int64_t size) | |
1717 | { | |
1718 | static const char suffixes[NB_SUFFIXES] = "KMGT"; | |
1719 | int64_t base; | |
1720 | int i; | |
1721 | ||
1722 | if (size <= 999) { | |
1723 | snprintf(buf, buf_size, "%" PRId64, size); | |
1724 | } else { | |
1725 | base = 1024; | |
1726 | for(i = 0; i < NB_SUFFIXES; i++) { | |
1727 | if (size < (10 * base)) { | |
5fafdf24 | 1728 | snprintf(buf, buf_size, "%0.1f%c", |
faea38e7 FB |
1729 | (double)size / base, |
1730 | suffixes[i]); | |
1731 | break; | |
1732 | } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { | |
5fafdf24 | 1733 | snprintf(buf, buf_size, "%" PRId64 "%c", |
faea38e7 FB |
1734 | ((size + (base >> 1)) / base), |
1735 | suffixes[i]); | |
1736 | break; | |
1737 | } | |
1738 | base = base * 1024; | |
1739 | } | |
1740 | } | |
1741 | return buf; | |
1742 | } | |
1743 | ||
1744 | char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) | |
1745 | { | |
1746 | char buf1[128], date_buf[128], clock_buf[128]; | |
3b9f94e1 FB |
1747 | #ifdef _WIN32 |
1748 | struct tm *ptm; | |
1749 | #else | |
faea38e7 | 1750 | struct tm tm; |
3b9f94e1 | 1751 | #endif |
faea38e7 FB |
1752 | time_t ti; |
1753 | int64_t secs; | |
1754 | ||
1755 | if (!sn) { | |
5fafdf24 TS |
1756 | snprintf(buf, buf_size, |
1757 | "%-10s%-20s%7s%20s%15s", | |
faea38e7 FB |
1758 | "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
1759 | } else { | |
1760 | ti = sn->date_sec; | |
3b9f94e1 FB |
1761 | #ifdef _WIN32 |
1762 | ptm = localtime(&ti); | |
1763 | strftime(date_buf, sizeof(date_buf), | |
1764 | "%Y-%m-%d %H:%M:%S", ptm); | |
1765 | #else | |
faea38e7 FB |
1766 | localtime_r(&ti, &tm); |
1767 | strftime(date_buf, sizeof(date_buf), | |
1768 | "%Y-%m-%d %H:%M:%S", &tm); | |
3b9f94e1 | 1769 | #endif |
faea38e7 FB |
1770 | secs = sn->vm_clock_nsec / 1000000000; |
1771 | snprintf(clock_buf, sizeof(clock_buf), | |
1772 | "%02d:%02d:%02d.%03d", | |
1773 | (int)(secs / 3600), | |
1774 | (int)((secs / 60) % 60), | |
5fafdf24 | 1775 | (int)(secs % 60), |
faea38e7 FB |
1776 | (int)((sn->vm_clock_nsec / 1000000) % 1000)); |
1777 | snprintf(buf, buf_size, | |
5fafdf24 | 1778 | "%-10s%-20s%7s%20s%15s", |
faea38e7 FB |
1779 | sn->id_str, sn->name, |
1780 | get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), | |
1781 | date_buf, | |
1782 | clock_buf); | |
1783 | } | |
1784 | return buf; | |
1785 | } | |
1786 | ||
83f64091 | 1787 | |
ea2384d3 | 1788 | /**************************************************************/ |
83f64091 | 1789 | /* async I/Os */ |
ea2384d3 | 1790 | |
3b69e4b9 | 1791 | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
f141eafe | 1792 | QEMUIOVector *qiov, int nb_sectors, |
3b69e4b9 | 1793 | BlockDriverCompletionFunc *cb, void *opaque) |
83f64091 FB |
1794 | { |
1795 | BlockDriver *drv = bs->drv; | |
a36e69dd | 1796 | BlockDriverAIOCB *ret; |
83f64091 | 1797 | |
19cb3738 | 1798 | if (!drv) |
ce1a14dc | 1799 | return NULL; |
71d0770c AL |
1800 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
1801 | return NULL; | |
3b46e624 | 1802 | |
f141eafe AL |
1803 | ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors, |
1804 | cb, opaque); | |
a36e69dd TS |
1805 | |
1806 | if (ret) { | |
1807 | /* Update stats even though technically transfer has not happened. */ | |
6ea44308 | 1808 | bs->rd_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE; |
a36e69dd TS |
1809 | bs->rd_ops ++; |
1810 | } | |
1811 | ||
1812 | return ret; | |
ea2384d3 FB |
1813 | } |
1814 | ||
f141eafe AL |
1815 | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
1816 | QEMUIOVector *qiov, int nb_sectors, | |
1817 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 1818 | { |
83f64091 | 1819 | BlockDriver *drv = bs->drv; |
a36e69dd | 1820 | BlockDriverAIOCB *ret; |
ea2384d3 | 1821 | |
19cb3738 | 1822 | if (!drv) |
ce1a14dc | 1823 | return NULL; |
83f64091 | 1824 | if (bs->read_only) |
ce1a14dc | 1825 | return NULL; |
71d0770c AL |
1826 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
1827 | return NULL; | |
83f64091 | 1828 | |
c6d22830 | 1829 | if (bs->dirty_bitmap) { |
7cd1e32a | 1830 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
1831 | } | |
a55eb92c | 1832 | |
f141eafe AL |
1833 | ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors, |
1834 | cb, opaque); | |
a36e69dd TS |
1835 | |
1836 | if (ret) { | |
1837 | /* Update stats even though technically transfer has not happened. */ | |
6ea44308 | 1838 | bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE; |
a36e69dd TS |
1839 | bs->wr_ops ++; |
1840 | } | |
1841 | ||
1842 | return ret; | |
83f64091 FB |
1843 | } |
1844 | ||
40b4f539 KW |
1845 | |
1846 | typedef struct MultiwriteCB { | |
1847 | int error; | |
1848 | int num_requests; | |
1849 | int num_callbacks; | |
1850 | struct { | |
1851 | BlockDriverCompletionFunc *cb; | |
1852 | void *opaque; | |
1853 | QEMUIOVector *free_qiov; | |
1854 | void *free_buf; | |
1855 | } callbacks[]; | |
1856 | } MultiwriteCB; | |
1857 | ||
1858 | static void multiwrite_user_cb(MultiwriteCB *mcb) | |
1859 | { | |
1860 | int i; | |
1861 | ||
1862 | for (i = 0; i < mcb->num_callbacks; i++) { | |
1863 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); | |
1e1ea48d SH |
1864 | if (mcb->callbacks[i].free_qiov) { |
1865 | qemu_iovec_destroy(mcb->callbacks[i].free_qiov); | |
1866 | } | |
40b4f539 | 1867 | qemu_free(mcb->callbacks[i].free_qiov); |
f8a83245 | 1868 | qemu_vfree(mcb->callbacks[i].free_buf); |
40b4f539 KW |
1869 | } |
1870 | } | |
1871 | ||
1872 | static void multiwrite_cb(void *opaque, int ret) | |
1873 | { | |
1874 | MultiwriteCB *mcb = opaque; | |
1875 | ||
cb6d3ca0 | 1876 | if (ret < 0 && !mcb->error) { |
40b4f539 KW |
1877 | mcb->error = ret; |
1878 | multiwrite_user_cb(mcb); | |
1879 | } | |
1880 | ||
1881 | mcb->num_requests--; | |
1882 | if (mcb->num_requests == 0) { | |
1883 | if (mcb->error == 0) { | |
1884 | multiwrite_user_cb(mcb); | |
1885 | } | |
1886 | qemu_free(mcb); | |
1887 | } | |
1888 | } | |
1889 | ||
1890 | static int multiwrite_req_compare(const void *a, const void *b) | |
1891 | { | |
1892 | return (((BlockRequest*) a)->sector - ((BlockRequest*) b)->sector); | |
1893 | } | |
1894 | ||
1895 | /* | |
1896 | * Takes a bunch of requests and tries to merge them. Returns the number of | |
1897 | * requests that remain after merging. | |
1898 | */ | |
1899 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, | |
1900 | int num_reqs, MultiwriteCB *mcb) | |
1901 | { | |
1902 | int i, outidx; | |
1903 | ||
1904 | // Sort requests by start sector | |
1905 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); | |
1906 | ||
1907 | // Check if adjacent requests touch the same clusters. If so, combine them, | |
1908 | // filling up gaps with zero sectors. | |
1909 | outidx = 0; | |
1910 | for (i = 1; i < num_reqs; i++) { | |
1911 | int merge = 0; | |
1912 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; | |
1913 | ||
1914 | // This handles the cases that are valid for all block drivers, namely | |
1915 | // exactly sequential writes and overlapping writes. | |
1916 | if (reqs[i].sector <= oldreq_last) { | |
1917 | merge = 1; | |
1918 | } | |
1919 | ||
1920 | // The block driver may decide that it makes sense to combine requests | |
1921 | // even if there is a gap of some sectors between them. In this case, | |
1922 | // the gap is filled with zeros (therefore only applicable for yet | |
1923 | // unused space in format like qcow2). | |
1924 | if (!merge && bs->drv->bdrv_merge_requests) { | |
1925 | merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]); | |
1926 | } | |
1927 | ||
e2a305fb CH |
1928 | if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
1929 | merge = 0; | |
1930 | } | |
1931 | ||
40b4f539 KW |
1932 | if (merge) { |
1933 | size_t size; | |
1934 | QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov)); | |
1935 | qemu_iovec_init(qiov, | |
1936 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); | |
1937 | ||
1938 | // Add the first request to the merged one. If the requests are | |
1939 | // overlapping, drop the last sectors of the first request. | |
1940 | size = (reqs[i].sector - reqs[outidx].sector) << 9; | |
1941 | qemu_iovec_concat(qiov, reqs[outidx].qiov, size); | |
1942 | ||
1943 | // We might need to add some zeros between the two requests | |
1944 | if (reqs[i].sector > oldreq_last) { | |
1945 | size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9; | |
1946 | uint8_t *buf = qemu_blockalign(bs, zero_bytes); | |
1947 | memset(buf, 0, zero_bytes); | |
1948 | qemu_iovec_add(qiov, buf, zero_bytes); | |
1949 | mcb->callbacks[i].free_buf = buf; | |
1950 | } | |
1951 | ||
1952 | // Add the second request | |
1953 | qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size); | |
1954 | ||
1955 | reqs[outidx].nb_sectors += reqs[i].nb_sectors; | |
1956 | reqs[outidx].qiov = qiov; | |
1957 | ||
1958 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; | |
1959 | } else { | |
1960 | outidx++; | |
1961 | reqs[outidx].sector = reqs[i].sector; | |
1962 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; | |
1963 | reqs[outidx].qiov = reqs[i].qiov; | |
1964 | } | |
1965 | } | |
1966 | ||
1967 | return outidx + 1; | |
1968 | } | |
1969 | ||
1970 | /* | |
1971 | * Submit multiple AIO write requests at once. | |
1972 | * | |
1973 | * On success, the function returns 0 and all requests in the reqs array have | |
1974 | * been submitted. In error case this function returns -1, and any of the | |
1975 | * requests may or may not be submitted yet. In particular, this means that the | |
1976 | * callback will be called for some of the requests, for others it won't. The | |
1977 | * caller must check the error field of the BlockRequest to wait for the right | |
1978 | * callbacks (if error != 0, no callback will be called). | |
1979 | * | |
1980 | * The implementation may modify the contents of the reqs array, e.g. to merge | |
1981 | * requests. However, the fields opaque and error are left unmodified as they | |
1982 | * are used to signal failure for a single request to the caller. | |
1983 | */ | |
1984 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) | |
1985 | { | |
1986 | BlockDriverAIOCB *acb; | |
1987 | MultiwriteCB *mcb; | |
1988 | int i; | |
1989 | ||
1990 | if (num_reqs == 0) { | |
1991 | return 0; | |
1992 | } | |
1993 | ||
1994 | // Create MultiwriteCB structure | |
1995 | mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); | |
1996 | mcb->num_requests = 0; | |
1997 | mcb->num_callbacks = num_reqs; | |
1998 | ||
1999 | for (i = 0; i < num_reqs; i++) { | |
2000 | mcb->callbacks[i].cb = reqs[i].cb; | |
2001 | mcb->callbacks[i].opaque = reqs[i].opaque; | |
2002 | } | |
2003 | ||
2004 | // Check for mergable requests | |
2005 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); | |
2006 | ||
2007 | // Run the aio requests | |
2008 | for (i = 0; i < num_reqs; i++) { | |
2009 | acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, | |
2010 | reqs[i].nb_sectors, multiwrite_cb, mcb); | |
2011 | ||
2012 | if (acb == NULL) { | |
2013 | // We can only fail the whole thing if no request has been | |
2014 | // submitted yet. Otherwise we'll wait for the submitted AIOs to | |
2015 | // complete and report the error in the callback. | |
2016 | if (mcb->num_requests == 0) { | |
0f0b604b | 2017 | reqs[i].error = -EIO; |
40b4f539 KW |
2018 | goto fail; |
2019 | } else { | |
7eb58a6c KW |
2020 | mcb->num_requests++; |
2021 | multiwrite_cb(mcb, -EIO); | |
40b4f539 KW |
2022 | break; |
2023 | } | |
2024 | } else { | |
2025 | mcb->num_requests++; | |
2026 | } | |
2027 | } | |
2028 | ||
2029 | return 0; | |
2030 | ||
2031 | fail: | |
2032 | free(mcb); | |
2033 | return -1; | |
2034 | } | |
2035 | ||
b2e12bc6 CH |
2036 | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
2037 | BlockDriverCompletionFunc *cb, void *opaque) | |
2038 | { | |
2039 | BlockDriver *drv = bs->drv; | |
2040 | ||
2041 | if (!drv) | |
2042 | return NULL; | |
b2e12bc6 CH |
2043 | return drv->bdrv_aio_flush(bs, cb, opaque); |
2044 | } | |
2045 | ||
83f64091 | 2046 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
83f64091 | 2047 | { |
6bbff9a0 | 2048 | acb->pool->cancel(acb); |
83f64091 FB |
2049 | } |
2050 | ||
ce1a14dc | 2051 | |
83f64091 FB |
2052 | /**************************************************************/ |
2053 | /* async block device emulation */ | |
2054 | ||
c16b5a2c CH |
2055 | typedef struct BlockDriverAIOCBSync { |
2056 | BlockDriverAIOCB common; | |
2057 | QEMUBH *bh; | |
2058 | int ret; | |
2059 | /* vector translation state */ | |
2060 | QEMUIOVector *qiov; | |
2061 | uint8_t *bounce; | |
2062 | int is_write; | |
2063 | } BlockDriverAIOCBSync; | |
2064 | ||
2065 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) | |
2066 | { | |
2067 | BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb; | |
6a7ad299 | 2068 | qemu_bh_delete(acb->bh); |
36afc451 | 2069 | acb->bh = NULL; |
c16b5a2c CH |
2070 | qemu_aio_release(acb); |
2071 | } | |
2072 | ||
2073 | static AIOPool bdrv_em_aio_pool = { | |
2074 | .aiocb_size = sizeof(BlockDriverAIOCBSync), | |
2075 | .cancel = bdrv_aio_cancel_em, | |
2076 | }; | |
2077 | ||
ce1a14dc | 2078 | static void bdrv_aio_bh_cb(void *opaque) |
83f64091 | 2079 | { |
ce1a14dc | 2080 | BlockDriverAIOCBSync *acb = opaque; |
f141eafe | 2081 | |
f141eafe AL |
2082 | if (!acb->is_write) |
2083 | qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); | |
ceb42de8 | 2084 | qemu_vfree(acb->bounce); |
ce1a14dc | 2085 | acb->common.cb(acb->common.opaque, acb->ret); |
6a7ad299 | 2086 | qemu_bh_delete(acb->bh); |
36afc451 | 2087 | acb->bh = NULL; |
ce1a14dc | 2088 | qemu_aio_release(acb); |
83f64091 | 2089 | } |
beac80cd | 2090 | |
f141eafe AL |
2091 | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
2092 | int64_t sector_num, | |
2093 | QEMUIOVector *qiov, | |
2094 | int nb_sectors, | |
2095 | BlockDriverCompletionFunc *cb, | |
2096 | void *opaque, | |
2097 | int is_write) | |
2098 | ||
83f64091 | 2099 | { |
ce1a14dc | 2100 | BlockDriverAIOCBSync *acb; |
ce1a14dc | 2101 | |
c16b5a2c | 2102 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
f141eafe AL |
2103 | acb->is_write = is_write; |
2104 | acb->qiov = qiov; | |
e268ca52 | 2105 | acb->bounce = qemu_blockalign(bs, qiov->size); |
f141eafe | 2106 | |
ce1a14dc PB |
2107 | if (!acb->bh) |
2108 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
f141eafe AL |
2109 | |
2110 | if (is_write) { | |
2111 | qemu_iovec_to_buffer(acb->qiov, acb->bounce); | |
2112 | acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors); | |
2113 | } else { | |
2114 | acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors); | |
2115 | } | |
2116 | ||
ce1a14dc | 2117 | qemu_bh_schedule(acb->bh); |
f141eafe | 2118 | |
ce1a14dc | 2119 | return &acb->common; |
beac80cd FB |
2120 | } |
2121 | ||
f141eafe AL |
2122 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
2123 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 2124 | BlockDriverCompletionFunc *cb, void *opaque) |
beac80cd | 2125 | { |
f141eafe AL |
2126 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
2127 | } | |
83f64091 | 2128 | |
f141eafe AL |
2129 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
2130 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
2131 | BlockDriverCompletionFunc *cb, void *opaque) | |
2132 | { | |
2133 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); | |
beac80cd | 2134 | } |
beac80cd | 2135 | |
b2e12bc6 CH |
2136 | static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, |
2137 | BlockDriverCompletionFunc *cb, void *opaque) | |
2138 | { | |
2139 | BlockDriverAIOCBSync *acb; | |
2140 | ||
2141 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); | |
2142 | acb->is_write = 1; /* don't bounce in the completion hadler */ | |
2143 | acb->qiov = NULL; | |
2144 | acb->bounce = NULL; | |
2145 | acb->ret = 0; | |
2146 | ||
2147 | if (!acb->bh) | |
2148 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
2149 | ||
2150 | bdrv_flush(bs); | |
2151 | qemu_bh_schedule(acb->bh); | |
2152 | return &acb->common; | |
2153 | } | |
2154 | ||
83f64091 FB |
2155 | /**************************************************************/ |
2156 | /* sync block device emulation */ | |
ea2384d3 | 2157 | |
83f64091 FB |
2158 | static void bdrv_rw_em_cb(void *opaque, int ret) |
2159 | { | |
2160 | *(int *)opaque = ret; | |
ea2384d3 FB |
2161 | } |
2162 | ||
83f64091 FB |
2163 | #define NOT_DONE 0x7fffffff |
2164 | ||
5fafdf24 | 2165 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
83f64091 | 2166 | uint8_t *buf, int nb_sectors) |
7a6cba61 | 2167 | { |
ce1a14dc PB |
2168 | int async_ret; |
2169 | BlockDriverAIOCB *acb; | |
f141eafe AL |
2170 | struct iovec iov; |
2171 | QEMUIOVector qiov; | |
83f64091 | 2172 | |
65d6b3d8 KW |
2173 | async_context_push(); |
2174 | ||
83f64091 | 2175 | async_ret = NOT_DONE; |
3f4cb3d3 | 2176 | iov.iov_base = (void *)buf; |
f141eafe AL |
2177 | iov.iov_len = nb_sectors * 512; |
2178 | qemu_iovec_init_external(&qiov, &iov, 1); | |
2179 | acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors, | |
2180 | bdrv_rw_em_cb, &async_ret); | |
65d6b3d8 KW |
2181 | if (acb == NULL) { |
2182 | async_ret = -1; | |
2183 | goto fail; | |
2184 | } | |
baf35cb9 | 2185 | |
83f64091 FB |
2186 | while (async_ret == NOT_DONE) { |
2187 | qemu_aio_wait(); | |
2188 | } | |
baf35cb9 | 2189 | |
65d6b3d8 KW |
2190 | |
2191 | fail: | |
2192 | async_context_pop(); | |
83f64091 | 2193 | return async_ret; |
7a6cba61 PB |
2194 | } |
2195 | ||
83f64091 FB |
2196 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
2197 | const uint8_t *buf, int nb_sectors) | |
2198 | { | |
ce1a14dc PB |
2199 | int async_ret; |
2200 | BlockDriverAIOCB *acb; | |
f141eafe AL |
2201 | struct iovec iov; |
2202 | QEMUIOVector qiov; | |
83f64091 | 2203 | |
65d6b3d8 KW |
2204 | async_context_push(); |
2205 | ||
83f64091 | 2206 | async_ret = NOT_DONE; |
f141eafe AL |
2207 | iov.iov_base = (void *)buf; |
2208 | iov.iov_len = nb_sectors * 512; | |
2209 | qemu_iovec_init_external(&qiov, &iov, 1); | |
2210 | acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors, | |
2211 | bdrv_rw_em_cb, &async_ret); | |
65d6b3d8 KW |
2212 | if (acb == NULL) { |
2213 | async_ret = -1; | |
2214 | goto fail; | |
2215 | } | |
83f64091 FB |
2216 | while (async_ret == NOT_DONE) { |
2217 | qemu_aio_wait(); | |
2218 | } | |
65d6b3d8 KW |
2219 | |
2220 | fail: | |
2221 | async_context_pop(); | |
83f64091 FB |
2222 | return async_ret; |
2223 | } | |
ea2384d3 FB |
2224 | |
2225 | void bdrv_init(void) | |
2226 | { | |
5efa9d5a | 2227 | module_call_init(MODULE_INIT_BLOCK); |
ea2384d3 | 2228 | } |
ce1a14dc | 2229 | |
eb852011 MA |
2230 | void bdrv_init_with_whitelist(void) |
2231 | { | |
2232 | use_bdrv_whitelist = 1; | |
2233 | bdrv_init(); | |
2234 | } | |
2235 | ||
c16b5a2c CH |
2236 | void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs, |
2237 | BlockDriverCompletionFunc *cb, void *opaque) | |
ce1a14dc | 2238 | { |
ce1a14dc PB |
2239 | BlockDriverAIOCB *acb; |
2240 | ||
6bbff9a0 AL |
2241 | if (pool->free_aiocb) { |
2242 | acb = pool->free_aiocb; | |
2243 | pool->free_aiocb = acb->next; | |
ce1a14dc | 2244 | } else { |
6bbff9a0 AL |
2245 | acb = qemu_mallocz(pool->aiocb_size); |
2246 | acb->pool = pool; | |
ce1a14dc PB |
2247 | } |
2248 | acb->bs = bs; | |
2249 | acb->cb = cb; | |
2250 | acb->opaque = opaque; | |
2251 | return acb; | |
2252 | } | |
2253 | ||
2254 | void qemu_aio_release(void *p) | |
2255 | { | |
6bbff9a0 AL |
2256 | BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; |
2257 | AIOPool *pool = acb->pool; | |
2258 | acb->next = pool->free_aiocb; | |
2259 | pool->free_aiocb = acb; | |
ce1a14dc | 2260 | } |
19cb3738 FB |
2261 | |
2262 | /**************************************************************/ | |
2263 | /* removable device support */ | |
2264 | ||
2265 | /** | |
2266 | * Return TRUE if the media is present | |
2267 | */ | |
2268 | int bdrv_is_inserted(BlockDriverState *bs) | |
2269 | { | |
2270 | BlockDriver *drv = bs->drv; | |
2271 | int ret; | |
2272 | if (!drv) | |
2273 | return 0; | |
2274 | if (!drv->bdrv_is_inserted) | |
2275 | return 1; | |
2276 | ret = drv->bdrv_is_inserted(bs); | |
2277 | return ret; | |
2278 | } | |
2279 | ||
2280 | /** | |
2281 | * Return TRUE if the media changed since the last call to this | |
5fafdf24 | 2282 | * function. It is currently only used for floppy disks |
19cb3738 FB |
2283 | */ |
2284 | int bdrv_media_changed(BlockDriverState *bs) | |
2285 | { | |
2286 | BlockDriver *drv = bs->drv; | |
2287 | int ret; | |
2288 | ||
2289 | if (!drv || !drv->bdrv_media_changed) | |
2290 | ret = -ENOTSUP; | |
2291 | else | |
2292 | ret = drv->bdrv_media_changed(bs); | |
2293 | if (ret == -ENOTSUP) | |
2294 | ret = bs->media_changed; | |
2295 | bs->media_changed = 0; | |
2296 | return ret; | |
2297 | } | |
2298 | ||
2299 | /** | |
2300 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
2301 | */ | |
aea2a33c | 2302 | int bdrv_eject(BlockDriverState *bs, int eject_flag) |
19cb3738 FB |
2303 | { |
2304 | BlockDriver *drv = bs->drv; | |
2305 | int ret; | |
2306 | ||
aea2a33c MM |
2307 | if (bs->locked) { |
2308 | return -EBUSY; | |
2309 | } | |
2310 | ||
19cb3738 FB |
2311 | if (!drv || !drv->bdrv_eject) { |
2312 | ret = -ENOTSUP; | |
2313 | } else { | |
2314 | ret = drv->bdrv_eject(bs, eject_flag); | |
2315 | } | |
2316 | if (ret == -ENOTSUP) { | |
2317 | if (eject_flag) | |
2318 | bdrv_close(bs); | |
aea2a33c | 2319 | ret = 0; |
19cb3738 | 2320 | } |
aea2a33c MM |
2321 | |
2322 | return ret; | |
19cb3738 FB |
2323 | } |
2324 | ||
2325 | int bdrv_is_locked(BlockDriverState *bs) | |
2326 | { | |
2327 | return bs->locked; | |
2328 | } | |
2329 | ||
2330 | /** | |
2331 | * Lock or unlock the media (if it is locked, the user won't be able | |
2332 | * to eject it manually). | |
2333 | */ | |
2334 | void bdrv_set_locked(BlockDriverState *bs, int locked) | |
2335 | { | |
2336 | BlockDriver *drv = bs->drv; | |
2337 | ||
2338 | bs->locked = locked; | |
2339 | if (drv && drv->bdrv_set_locked) { | |
2340 | drv->bdrv_set_locked(bs, locked); | |
2341 | } | |
2342 | } | |
985a03b0 TS |
2343 | |
2344 | /* needed for generic scsi interface */ | |
2345 | ||
2346 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
2347 | { | |
2348 | BlockDriver *drv = bs->drv; | |
2349 | ||
2350 | if (drv && drv->bdrv_ioctl) | |
2351 | return drv->bdrv_ioctl(bs, req, buf); | |
2352 | return -ENOTSUP; | |
2353 | } | |
7d780669 | 2354 | |
221f715d AL |
2355 | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
2356 | unsigned long int req, void *buf, | |
2357 | BlockDriverCompletionFunc *cb, void *opaque) | |
7d780669 | 2358 | { |
221f715d | 2359 | BlockDriver *drv = bs->drv; |
7d780669 | 2360 | |
221f715d AL |
2361 | if (drv && drv->bdrv_aio_ioctl) |
2362 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); | |
2363 | return NULL; | |
7d780669 | 2364 | } |
e268ca52 | 2365 | |
7cd1e32a | 2366 | |
2367 | ||
e268ca52 AL |
2368 | void *qemu_blockalign(BlockDriverState *bs, size_t size) |
2369 | { | |
2370 | return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); | |
2371 | } | |
7cd1e32a | 2372 | |
2373 | void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable) | |
2374 | { | |
2375 | int64_t bitmap_size; | |
a55eb92c | 2376 | |
aaa0eb75 | 2377 | bs->dirty_count = 0; |
a55eb92c | 2378 | if (enable) { |
c6d22830 JK |
2379 | if (!bs->dirty_bitmap) { |
2380 | bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) + | |
2381 | BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1; | |
2382 | bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8; | |
a55eb92c | 2383 | |
7cd1e32a | 2384 | bs->dirty_bitmap = qemu_mallocz(bitmap_size); |
a55eb92c | 2385 | } |
7cd1e32a | 2386 | } else { |
c6d22830 | 2387 | if (bs->dirty_bitmap) { |
7cd1e32a | 2388 | qemu_free(bs->dirty_bitmap); |
c6d22830 | 2389 | bs->dirty_bitmap = NULL; |
a55eb92c | 2390 | } |
7cd1e32a | 2391 | } |
2392 | } | |
2393 | ||
2394 | int bdrv_get_dirty(BlockDriverState *bs, int64_t sector) | |
2395 | { | |
6ea44308 | 2396 | int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; |
a55eb92c | 2397 | |
c6d22830 JK |
2398 | if (bs->dirty_bitmap && |
2399 | (sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) { | |
2400 | return bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] & | |
2401 | (1 << (chunk % (sizeof(unsigned long) * 8))); | |
7cd1e32a | 2402 | } else { |
2403 | return 0; | |
2404 | } | |
2405 | } | |
2406 | ||
a55eb92c JK |
2407 | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, |
2408 | int nr_sectors) | |
7cd1e32a | 2409 | { |
2410 | set_dirty_bitmap(bs, cur_sector, nr_sectors, 0); | |
2411 | } | |
aaa0eb75 LS |
2412 | |
2413 | int64_t bdrv_get_dirty_count(BlockDriverState *bs) | |
2414 | { | |
2415 | return bs->dirty_count; | |
2416 | } |