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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; |
20993081 | 290 | int is_drive; |
19cb3738 | 291 | |
66f82cee KW |
292 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ |
293 | ||
19cb3738 | 294 | #ifdef _WIN32 |
20993081 KW |
295 | is_drive = is_windows_drive(filename) || |
296 | is_windows_drive_prefix(filename); | |
297 | #else | |
298 | is_drive = 0; | |
19cb3738 | 299 | #endif |
1cec71e3 | 300 | p = strchr(filename, ':'); |
20993081 | 301 | if (!p || is_drive) { |
84a12e66 CH |
302 | drv1 = find_hdev_driver(filename); |
303 | if (!drv1) { | |
304 | drv1 = bdrv_find_format("file"); | |
305 | } | |
306 | return drv1; | |
307 | } | |
1cec71e3 AL |
308 | len = p - filename; |
309 | if (len > sizeof(protocol) - 1) | |
310 | len = sizeof(protocol) - 1; | |
311 | memcpy(protocol, filename, len); | |
312 | protocol[len] = '\0'; | |
8a22f02a | 313 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
5fafdf24 | 314 | if (drv1->protocol_name && |
8a22f02a | 315 | !strcmp(drv1->protocol_name, protocol)) { |
83f64091 | 316 | return drv1; |
8a22f02a | 317 | } |
83f64091 FB |
318 | } |
319 | return NULL; | |
320 | } | |
321 | ||
f3a5d3f8 CH |
322 | static BlockDriver *find_image_format(const char *filename) |
323 | { | |
324 | int ret, score, score_max; | |
325 | BlockDriver *drv1, *drv; | |
326 | uint8_t buf[2048]; | |
327 | BlockDriverState *bs; | |
328 | ||
83f64091 | 329 | drv = find_protocol(filename); |
19cb3738 | 330 | /* no need to test disk image formats for vvfat */ |
c833ab73 | 331 | if (drv && strcmp(drv->format_name, "vvfat") == 0) |
83f64091 | 332 | return drv; |
19cb3738 | 333 | |
f5edb014 | 334 | ret = bdrv_file_open(&bs, filename, 0); |
83f64091 FB |
335 | if (ret < 0) |
336 | return NULL; | |
337 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); | |
338 | bdrv_delete(bs); | |
339 | if (ret < 0) { | |
340 | return NULL; | |
341 | } | |
342 | ||
ea2384d3 | 343 | score_max = 0; |
84a12e66 | 344 | drv = NULL; |
8a22f02a | 345 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
83f64091 FB |
346 | if (drv1->bdrv_probe) { |
347 | score = drv1->bdrv_probe(buf, ret, filename); | |
348 | if (score > score_max) { | |
349 | score_max = score; | |
350 | drv = drv1; | |
351 | } | |
0849bf08 | 352 | } |
fc01f7e7 | 353 | } |
ea2384d3 FB |
354 | return drv; |
355 | } | |
356 | ||
51762288 SH |
357 | /** |
358 | * Set the current 'total_sectors' value | |
359 | */ | |
360 | static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) | |
361 | { | |
362 | BlockDriver *drv = bs->drv; | |
363 | ||
364 | /* query actual device if possible, otherwise just trust the hint */ | |
365 | if (drv->bdrv_getlength) { | |
366 | int64_t length = drv->bdrv_getlength(bs); | |
367 | if (length < 0) { | |
368 | return length; | |
369 | } | |
370 | hint = length >> BDRV_SECTOR_BITS; | |
371 | } | |
372 | ||
373 | bs->total_sectors = hint; | |
374 | return 0; | |
375 | } | |
376 | ||
57915332 KW |
377 | /* |
378 | * Common part for opening disk images and files | |
379 | */ | |
380 | static int bdrv_open_common(BlockDriverState *bs, const char *filename, | |
381 | int flags, BlockDriver *drv) | |
382 | { | |
383 | int ret, open_flags; | |
384 | ||
385 | assert(drv != NULL); | |
386 | ||
66f82cee | 387 | bs->file = NULL; |
51762288 | 388 | bs->total_sectors = 0; |
57915332 KW |
389 | bs->is_temporary = 0; |
390 | bs->encrypted = 0; | |
391 | bs->valid_key = 0; | |
392 | bs->open_flags = flags; | |
393 | /* buffer_alignment defaulted to 512, drivers can change this value */ | |
394 | bs->buffer_alignment = 512; | |
395 | ||
396 | pstrcpy(bs->filename, sizeof(bs->filename), filename); | |
397 | ||
398 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) { | |
399 | return -ENOTSUP; | |
400 | } | |
401 | ||
402 | bs->drv = drv; | |
403 | bs->opaque = qemu_mallocz(drv->instance_size); | |
404 | ||
405 | /* | |
406 | * Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a | |
407 | * write cache to the guest. We do need the fdatasync to flush | |
408 | * out transactions for block allocations, and we maybe have a | |
409 | * volatile write cache in our backing device to deal with. | |
410 | */ | |
411 | if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE)) | |
412 | bs->enable_write_cache = 1; | |
413 | ||
414 | /* | |
415 | * Clear flags that are internal to the block layer before opening the | |
416 | * image. | |
417 | */ | |
418 | open_flags = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
419 | ||
420 | /* | |
421 | * Snapshots should be writeable. | |
422 | */ | |
423 | if (bs->is_temporary) { | |
424 | open_flags |= BDRV_O_RDWR; | |
425 | } | |
426 | ||
66f82cee KW |
427 | /* Open the image, either directly or using a protocol */ |
428 | if (drv->bdrv_file_open) { | |
429 | ret = drv->bdrv_file_open(bs, filename, open_flags); | |
430 | } else { | |
431 | ret = bdrv_file_open(&bs->file, filename, open_flags); | |
432 | if (ret >= 0) { | |
433 | ret = drv->bdrv_open(bs, open_flags); | |
434 | } | |
435 | } | |
436 | ||
57915332 KW |
437 | if (ret < 0) { |
438 | goto free_and_fail; | |
439 | } | |
440 | ||
441 | bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR); | |
51762288 SH |
442 | |
443 | ret = refresh_total_sectors(bs, bs->total_sectors); | |
444 | if (ret < 0) { | |
445 | goto free_and_fail; | |
57915332 | 446 | } |
51762288 | 447 | |
57915332 KW |
448 | #ifndef _WIN32 |
449 | if (bs->is_temporary) { | |
450 | unlink(filename); | |
451 | } | |
452 | #endif | |
453 | return 0; | |
454 | ||
455 | free_and_fail: | |
66f82cee KW |
456 | if (bs->file) { |
457 | bdrv_delete(bs->file); | |
458 | bs->file = NULL; | |
459 | } | |
57915332 KW |
460 | qemu_free(bs->opaque); |
461 | bs->opaque = NULL; | |
462 | bs->drv = NULL; | |
463 | return ret; | |
464 | } | |
465 | ||
b6ce07aa KW |
466 | /* |
467 | * Opens a file using a protocol (file, host_device, nbd, ...) | |
468 | */ | |
83f64091 | 469 | int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
ea2384d3 | 470 | { |
83f64091 | 471 | BlockDriverState *bs; |
6db95603 | 472 | BlockDriver *drv; |
83f64091 FB |
473 | int ret; |
474 | ||
6db95603 CH |
475 | drv = find_protocol(filename); |
476 | if (!drv) { | |
477 | return -ENOENT; | |
478 | } | |
479 | ||
83f64091 | 480 | bs = bdrv_new(""); |
b6ce07aa | 481 | ret = bdrv_open_common(bs, filename, flags, drv); |
83f64091 FB |
482 | if (ret < 0) { |
483 | bdrv_delete(bs); | |
484 | return ret; | |
3b0d4f61 | 485 | } |
71d0770c | 486 | bs->growable = 1; |
83f64091 FB |
487 | *pbs = bs; |
488 | return 0; | |
489 | } | |
490 | ||
b6ce07aa KW |
491 | /* |
492 | * Opens a disk image (raw, qcow2, vmdk, ...) | |
493 | */ | |
d6e9098e KW |
494 | int bdrv_open(BlockDriverState *bs, const char *filename, int flags, |
495 | BlockDriver *drv) | |
ea2384d3 | 496 | { |
b6ce07aa | 497 | int ret; |
712e7874 | 498 | |
83f64091 | 499 | if (flags & BDRV_O_SNAPSHOT) { |
ea2384d3 FB |
500 | BlockDriverState *bs1; |
501 | int64_t total_size; | |
7c96d46e | 502 | int is_protocol = 0; |
91a073a9 KW |
503 | BlockDriver *bdrv_qcow2; |
504 | QEMUOptionParameter *options; | |
b6ce07aa KW |
505 | char tmp_filename[PATH_MAX]; |
506 | char backing_filename[PATH_MAX]; | |
3b46e624 | 507 | |
ea2384d3 FB |
508 | /* if snapshot, we create a temporary backing file and open it |
509 | instead of opening 'filename' directly */ | |
33e3963e | 510 | |
ea2384d3 FB |
511 | /* if there is a backing file, use it */ |
512 | bs1 = bdrv_new(""); | |
d6e9098e | 513 | ret = bdrv_open(bs1, filename, 0, drv); |
51d7c00c | 514 | if (ret < 0) { |
ea2384d3 | 515 | bdrv_delete(bs1); |
51d7c00c | 516 | return ret; |
ea2384d3 | 517 | } |
6ea44308 | 518 | total_size = bdrv_getlength(bs1) >> BDRV_SECTOR_BITS; |
7c96d46e AL |
519 | |
520 | if (bs1->drv && bs1->drv->protocol_name) | |
521 | is_protocol = 1; | |
522 | ||
ea2384d3 | 523 | bdrv_delete(bs1); |
3b46e624 | 524 | |
ea2384d3 | 525 | get_tmp_filename(tmp_filename, sizeof(tmp_filename)); |
7c96d46e AL |
526 | |
527 | /* Real path is meaningless for protocols */ | |
528 | if (is_protocol) | |
529 | snprintf(backing_filename, sizeof(backing_filename), | |
530 | "%s", filename); | |
114cdfa9 KS |
531 | else if (!realpath(filename, backing_filename)) |
532 | return -errno; | |
7c96d46e | 533 | |
91a073a9 KW |
534 | bdrv_qcow2 = bdrv_find_format("qcow2"); |
535 | options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); | |
536 | ||
537 | set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size * 512); | |
538 | set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); | |
539 | if (drv) { | |
540 | set_option_parameter(options, BLOCK_OPT_BACKING_FMT, | |
541 | drv->format_name); | |
542 | } | |
543 | ||
544 | ret = bdrv_create(bdrv_qcow2, tmp_filename, options); | |
d748768c | 545 | free_option_parameters(options); |
51d7c00c AL |
546 | if (ret < 0) { |
547 | return ret; | |
ea2384d3 | 548 | } |
91a073a9 | 549 | |
ea2384d3 | 550 | filename = tmp_filename; |
91a073a9 | 551 | drv = bdrv_qcow2; |
ea2384d3 FB |
552 | bs->is_temporary = 1; |
553 | } | |
712e7874 | 554 | |
b6ce07aa | 555 | /* Find the right image format driver */ |
6db95603 | 556 | if (!drv) { |
84a12e66 | 557 | drv = find_image_format(filename); |
51d7c00c | 558 | } |
6987307c | 559 | |
51d7c00c AL |
560 | if (!drv) { |
561 | ret = -ENOENT; | |
562 | goto unlink_and_fail; | |
ea2384d3 | 563 | } |
b6ce07aa KW |
564 | |
565 | /* Open the image */ | |
566 | ret = bdrv_open_common(bs, filename, flags, drv); | |
567 | if (ret < 0) { | |
6987307c CH |
568 | goto unlink_and_fail; |
569 | } | |
570 | ||
b6ce07aa KW |
571 | /* If there is a backing file, use it */ |
572 | if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') { | |
573 | char backing_filename[PATH_MAX]; | |
574 | int back_flags; | |
575 | BlockDriver *back_drv = NULL; | |
576 | ||
577 | bs->backing_hd = bdrv_new(""); | |
578 | path_combine(backing_filename, sizeof(backing_filename), | |
579 | filename, bs->backing_file); | |
580 | if (bs->backing_format[0] != '\0') | |
581 | back_drv = bdrv_find_format(bs->backing_format); | |
582 | ||
583 | /* backing files always opened read-only */ | |
584 | back_flags = | |
585 | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
586 | ||
587 | ret = bdrv_open(bs->backing_hd, backing_filename, back_flags, back_drv); | |
588 | if (ret < 0) { | |
589 | bdrv_close(bs); | |
590 | return ret; | |
591 | } | |
592 | if (bs->is_temporary) { | |
593 | bs->backing_hd->keep_read_only = !(flags & BDRV_O_RDWR); | |
594 | } else { | |
595 | /* base image inherits from "parent" */ | |
596 | bs->backing_hd->keep_read_only = bs->keep_read_only; | |
597 | } | |
598 | } | |
599 | ||
600 | if (!bdrv_key_required(bs)) { | |
601 | /* call the change callback */ | |
602 | bs->media_changed = 1; | |
603 | if (bs->change_cb) | |
604 | bs->change_cb(bs->change_opaque); | |
605 | } | |
606 | ||
607 | return 0; | |
608 | ||
609 | unlink_and_fail: | |
610 | if (bs->is_temporary) { | |
611 | unlink(filename); | |
612 | } | |
613 | return ret; | |
614 | } | |
615 | ||
fc01f7e7 FB |
616 | void bdrv_close(BlockDriverState *bs) |
617 | { | |
19cb3738 | 618 | if (bs->drv) { |
557df6ac | 619 | if (bs->backing_hd) { |
ea2384d3 | 620 | bdrv_delete(bs->backing_hd); |
557df6ac SH |
621 | bs->backing_hd = NULL; |
622 | } | |
ea2384d3 FB |
623 | bs->drv->bdrv_close(bs); |
624 | qemu_free(bs->opaque); | |
625 | #ifdef _WIN32 | |
626 | if (bs->is_temporary) { | |
627 | unlink(bs->filename); | |
628 | } | |
67b915a5 | 629 | #endif |
ea2384d3 FB |
630 | bs->opaque = NULL; |
631 | bs->drv = NULL; | |
b338082b | 632 | |
66f82cee KW |
633 | if (bs->file != NULL) { |
634 | bdrv_close(bs->file); | |
635 | } | |
636 | ||
b338082b | 637 | /* call the change callback */ |
19cb3738 | 638 | bs->media_changed = 1; |
b338082b FB |
639 | if (bs->change_cb) |
640 | bs->change_cb(bs->change_opaque); | |
641 | } | |
642 | } | |
643 | ||
644 | void bdrv_delete(BlockDriverState *bs) | |
645 | { | |
1b7bdbc1 SH |
646 | /* remove from list, if necessary */ |
647 | if (bs->device_name[0] != '\0') { | |
648 | QTAILQ_REMOVE(&bdrv_states, bs, list); | |
649 | } | |
34c6f050 | 650 | |
b338082b | 651 | bdrv_close(bs); |
66f82cee KW |
652 | if (bs->file != NULL) { |
653 | bdrv_delete(bs->file); | |
654 | } | |
655 | ||
b338082b | 656 | qemu_free(bs); |
fc01f7e7 FB |
657 | } |
658 | ||
e97fc193 AL |
659 | /* |
660 | * Run consistency checks on an image | |
661 | * | |
662 | * Returns the number of errors or -errno when an internal error occurs | |
663 | */ | |
664 | int bdrv_check(BlockDriverState *bs) | |
665 | { | |
666 | if (bs->drv->bdrv_check == NULL) { | |
667 | return -ENOTSUP; | |
668 | } | |
669 | ||
670 | return bs->drv->bdrv_check(bs); | |
671 | } | |
672 | ||
33e3963e FB |
673 | /* commit COW file into the raw image */ |
674 | int bdrv_commit(BlockDriverState *bs) | |
675 | { | |
19cb3738 | 676 | BlockDriver *drv = bs->drv; |
83f64091 | 677 | int64_t i, total_sectors; |
4dca4b63 NS |
678 | int n, j, ro, open_flags; |
679 | int ret = 0, rw_ret = 0; | |
ea2384d3 | 680 | unsigned char sector[512]; |
4dca4b63 NS |
681 | char filename[1024]; |
682 | BlockDriverState *bs_rw, *bs_ro; | |
33e3963e | 683 | |
19cb3738 FB |
684 | if (!drv) |
685 | return -ENOMEDIUM; | |
4dca4b63 NS |
686 | |
687 | if (!bs->backing_hd) { | |
688 | return -ENOTSUP; | |
33e3963e FB |
689 | } |
690 | ||
4dca4b63 NS |
691 | if (bs->backing_hd->keep_read_only) { |
692 | return -EACCES; | |
693 | } | |
694 | ||
695 | ro = bs->backing_hd->read_only; | |
696 | strncpy(filename, bs->backing_hd->filename, sizeof(filename)); | |
697 | open_flags = bs->backing_hd->open_flags; | |
698 | ||
699 | if (ro) { | |
700 | /* re-open as RW */ | |
701 | bdrv_delete(bs->backing_hd); | |
702 | bs->backing_hd = NULL; | |
703 | bs_rw = bdrv_new(""); | |
c3349197 | 704 | rw_ret = bdrv_open(bs_rw, filename, open_flags | BDRV_O_RDWR, drv); |
4dca4b63 NS |
705 | if (rw_ret < 0) { |
706 | bdrv_delete(bs_rw); | |
707 | /* try to re-open read-only */ | |
708 | bs_ro = bdrv_new(""); | |
c3349197 | 709 | ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, drv); |
4dca4b63 NS |
710 | if (ret < 0) { |
711 | bdrv_delete(bs_ro); | |
712 | /* drive not functional anymore */ | |
713 | bs->drv = NULL; | |
714 | return ret; | |
715 | } | |
716 | bs->backing_hd = bs_ro; | |
717 | return rw_ret; | |
718 | } | |
719 | bs->backing_hd = bs_rw; | |
ea2384d3 | 720 | } |
33e3963e | 721 | |
6ea44308 | 722 | total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
83f64091 | 723 | for (i = 0; i < total_sectors;) { |
19cb3738 | 724 | if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { |
ea2384d3 FB |
725 | for(j = 0; j < n; j++) { |
726 | if (bdrv_read(bs, i, sector, 1) != 0) { | |
4dca4b63 NS |
727 | ret = -EIO; |
728 | goto ro_cleanup; | |
ea2384d3 FB |
729 | } |
730 | ||
731 | if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { | |
4dca4b63 NS |
732 | ret = -EIO; |
733 | goto ro_cleanup; | |
ea2384d3 FB |
734 | } |
735 | i++; | |
33e3963e | 736 | } |
ea2384d3 FB |
737 | } else { |
738 | i += n; | |
739 | } | |
33e3963e | 740 | } |
95389c86 | 741 | |
1d44952f CH |
742 | if (drv->bdrv_make_empty) { |
743 | ret = drv->bdrv_make_empty(bs); | |
744 | bdrv_flush(bs); | |
745 | } | |
95389c86 | 746 | |
3f5075ae CH |
747 | /* |
748 | * Make sure all data we wrote to the backing device is actually | |
749 | * stable on disk. | |
750 | */ | |
751 | if (bs->backing_hd) | |
752 | bdrv_flush(bs->backing_hd); | |
4dca4b63 NS |
753 | |
754 | ro_cleanup: | |
755 | ||
756 | if (ro) { | |
757 | /* re-open as RO */ | |
758 | bdrv_delete(bs->backing_hd); | |
759 | bs->backing_hd = NULL; | |
760 | bs_ro = bdrv_new(""); | |
c3349197 | 761 | ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, drv); |
4dca4b63 NS |
762 | if (ret < 0) { |
763 | bdrv_delete(bs_ro); | |
764 | /* drive not functional anymore */ | |
765 | bs->drv = NULL; | |
766 | return ret; | |
767 | } | |
768 | bs->backing_hd = bs_ro; | |
769 | bs->backing_hd->keep_read_only = 0; | |
770 | } | |
771 | ||
1d44952f | 772 | return ret; |
33e3963e FB |
773 | } |
774 | ||
756e6736 KW |
775 | /* |
776 | * Return values: | |
777 | * 0 - success | |
778 | * -EINVAL - backing format specified, but no file | |
779 | * -ENOSPC - can't update the backing file because no space is left in the | |
780 | * image file header | |
781 | * -ENOTSUP - format driver doesn't support changing the backing file | |
782 | */ | |
783 | int bdrv_change_backing_file(BlockDriverState *bs, | |
784 | const char *backing_file, const char *backing_fmt) | |
785 | { | |
786 | BlockDriver *drv = bs->drv; | |
787 | ||
788 | if (drv->bdrv_change_backing_file != NULL) { | |
789 | return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); | |
790 | } else { | |
791 | return -ENOTSUP; | |
792 | } | |
793 | } | |
794 | ||
71d0770c AL |
795 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
796 | size_t size) | |
797 | { | |
798 | int64_t len; | |
799 | ||
800 | if (!bdrv_is_inserted(bs)) | |
801 | return -ENOMEDIUM; | |
802 | ||
803 | if (bs->growable) | |
804 | return 0; | |
805 | ||
806 | len = bdrv_getlength(bs); | |
807 | ||
fbb7b4e0 KW |
808 | if (offset < 0) |
809 | return -EIO; | |
810 | ||
811 | if ((offset > len) || (len - offset < size)) | |
71d0770c AL |
812 | return -EIO; |
813 | ||
814 | return 0; | |
815 | } | |
816 | ||
817 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, | |
818 | int nb_sectors) | |
819 | { | |
999dec57 | 820 | return bdrv_check_byte_request(bs, sector_num * 512, nb_sectors * 512); |
71d0770c AL |
821 | } |
822 | ||
19cb3738 | 823 | /* return < 0 if error. See bdrv_write() for the return codes */ |
5fafdf24 | 824 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
825 | uint8_t *buf, int nb_sectors) |
826 | { | |
ea2384d3 FB |
827 | BlockDriver *drv = bs->drv; |
828 | ||
19cb3738 FB |
829 | if (!drv) |
830 | return -ENOMEDIUM; | |
71d0770c AL |
831 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
832 | return -EIO; | |
b338082b | 833 | |
eda578e5 | 834 | return drv->bdrv_read(bs, sector_num, buf, nb_sectors); |
fc01f7e7 FB |
835 | } |
836 | ||
7cd1e32a | 837 | static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num, |
a55eb92c | 838 | int nb_sectors, int dirty) |
7cd1e32a | 839 | { |
840 | int64_t start, end; | |
c6d22830 | 841 | unsigned long val, idx, bit; |
a55eb92c | 842 | |
6ea44308 | 843 | start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; |
c6d22830 | 844 | end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK; |
a55eb92c JK |
845 | |
846 | for (; start <= end; start++) { | |
c6d22830 JK |
847 | idx = start / (sizeof(unsigned long) * 8); |
848 | bit = start % (sizeof(unsigned long) * 8); | |
849 | val = bs->dirty_bitmap[idx]; | |
850 | if (dirty) { | |
aaa0eb75 LS |
851 | if (!(val & (1 << bit))) { |
852 | bs->dirty_count++; | |
853 | val |= 1 << bit; | |
854 | } | |
c6d22830 | 855 | } else { |
aaa0eb75 LS |
856 | if (val & (1 << bit)) { |
857 | bs->dirty_count--; | |
858 | val &= ~(1 << bit); | |
859 | } | |
c6d22830 JK |
860 | } |
861 | bs->dirty_bitmap[idx] = val; | |
7cd1e32a | 862 | } |
863 | } | |
864 | ||
5fafdf24 | 865 | /* Return < 0 if error. Important errors are: |
19cb3738 FB |
866 | -EIO generic I/O error (may happen for all errors) |
867 | -ENOMEDIUM No media inserted. | |
868 | -EINVAL Invalid sector number or nb_sectors | |
869 | -EACCES Trying to write a read-only device | |
870 | */ | |
5fafdf24 | 871 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
872 | const uint8_t *buf, int nb_sectors) |
873 | { | |
83f64091 | 874 | BlockDriver *drv = bs->drv; |
19cb3738 FB |
875 | if (!bs->drv) |
876 | return -ENOMEDIUM; | |
0849bf08 | 877 | if (bs->read_only) |
19cb3738 | 878 | return -EACCES; |
71d0770c AL |
879 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
880 | return -EIO; | |
a55eb92c | 881 | |
c6d22830 | 882 | if (bs->dirty_bitmap) { |
7cd1e32a | 883 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
884 | } | |
a55eb92c | 885 | |
294cc35f KW |
886 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { |
887 | bs->wr_highest_sector = sector_num + nb_sectors - 1; | |
888 | } | |
889 | ||
42fb2807 | 890 | return drv->bdrv_write(bs, sector_num, buf, nb_sectors); |
83f64091 FB |
891 | } |
892 | ||
eda578e5 AL |
893 | int bdrv_pread(BlockDriverState *bs, int64_t offset, |
894 | void *buf, int count1) | |
83f64091 | 895 | { |
6ea44308 | 896 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
897 | int len, nb_sectors, count; |
898 | int64_t sector_num; | |
9a8c4cce | 899 | int ret; |
83f64091 FB |
900 | |
901 | count = count1; | |
902 | /* first read to align to sector start */ | |
6ea44308 | 903 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
904 | if (len > count) |
905 | len = count; | |
6ea44308 | 906 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 907 | if (len > 0) { |
9a8c4cce KW |
908 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
909 | return ret; | |
6ea44308 | 910 | memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len); |
83f64091 FB |
911 | count -= len; |
912 | if (count == 0) | |
913 | return count1; | |
914 | sector_num++; | |
915 | buf += len; | |
916 | } | |
917 | ||
918 | /* read the sectors "in place" */ | |
6ea44308 | 919 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 920 | if (nb_sectors > 0) { |
9a8c4cce KW |
921 | if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0) |
922 | return ret; | |
83f64091 | 923 | sector_num += nb_sectors; |
6ea44308 | 924 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
925 | buf += len; |
926 | count -= len; | |
927 | } | |
928 | ||
929 | /* add data from the last sector */ | |
930 | if (count > 0) { | |
9a8c4cce KW |
931 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
932 | return ret; | |
83f64091 FB |
933 | memcpy(buf, tmp_buf, count); |
934 | } | |
935 | return count1; | |
936 | } | |
937 | ||
eda578e5 AL |
938 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, |
939 | const void *buf, int count1) | |
83f64091 | 940 | { |
6ea44308 | 941 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
942 | int len, nb_sectors, count; |
943 | int64_t sector_num; | |
9a8c4cce | 944 | int ret; |
83f64091 FB |
945 | |
946 | count = count1; | |
947 | /* first write to align to sector start */ | |
6ea44308 | 948 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
949 | if (len > count) |
950 | len = count; | |
6ea44308 | 951 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 952 | if (len > 0) { |
9a8c4cce KW |
953 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
954 | return ret; | |
6ea44308 | 955 | memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len); |
9a8c4cce KW |
956 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
957 | return ret; | |
83f64091 FB |
958 | count -= len; |
959 | if (count == 0) | |
960 | return count1; | |
961 | sector_num++; | |
962 | buf += len; | |
963 | } | |
964 | ||
965 | /* write the sectors "in place" */ | |
6ea44308 | 966 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 967 | if (nb_sectors > 0) { |
9a8c4cce KW |
968 | if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0) |
969 | return ret; | |
83f64091 | 970 | sector_num += nb_sectors; |
6ea44308 | 971 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
972 | buf += len; |
973 | count -= len; | |
974 | } | |
975 | ||
976 | /* add data from the last sector */ | |
977 | if (count > 0) { | |
9a8c4cce KW |
978 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
979 | return ret; | |
83f64091 | 980 | memcpy(tmp_buf, buf, count); |
9a8c4cce KW |
981 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
982 | return ret; | |
83f64091 FB |
983 | } |
984 | return count1; | |
985 | } | |
83f64091 | 986 | |
83f64091 FB |
987 | /** |
988 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
989 | */ | |
990 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
991 | { | |
992 | BlockDriver *drv = bs->drv; | |
51762288 | 993 | int ret; |
83f64091 | 994 | if (!drv) |
19cb3738 | 995 | return -ENOMEDIUM; |
83f64091 FB |
996 | if (!drv->bdrv_truncate) |
997 | return -ENOTSUP; | |
59f2689d NS |
998 | if (bs->read_only) |
999 | return -EACCES; | |
51762288 SH |
1000 | ret = drv->bdrv_truncate(bs, offset); |
1001 | if (ret == 0) { | |
1002 | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); | |
1003 | } | |
1004 | return ret; | |
83f64091 FB |
1005 | } |
1006 | ||
1007 | /** | |
1008 | * Length of a file in bytes. Return < 0 if error or unknown. | |
1009 | */ | |
1010 | int64_t bdrv_getlength(BlockDriverState *bs) | |
1011 | { | |
1012 | BlockDriver *drv = bs->drv; | |
1013 | if (!drv) | |
19cb3738 | 1014 | return -ENOMEDIUM; |
51762288 SH |
1015 | |
1016 | /* Fixed size devices use the total_sectors value for speed instead of | |
1017 | issuing a length query (like lseek) on each call. Also, legacy block | |
1018 | drivers don't provide a bdrv_getlength function and must use | |
1019 | total_sectors. */ | |
1020 | if (!bs->growable || !drv->bdrv_getlength) { | |
6ea44308 | 1021 | return bs->total_sectors * BDRV_SECTOR_SIZE; |
83f64091 FB |
1022 | } |
1023 | return drv->bdrv_getlength(bs); | |
fc01f7e7 FB |
1024 | } |
1025 | ||
19cb3738 | 1026 | /* return 0 as number of sectors if no device present or error */ |
96b8f136 | 1027 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
fc01f7e7 | 1028 | { |
19cb3738 FB |
1029 | int64_t length; |
1030 | length = bdrv_getlength(bs); | |
1031 | if (length < 0) | |
1032 | length = 0; | |
1033 | else | |
6ea44308 | 1034 | length = length >> BDRV_SECTOR_BITS; |
19cb3738 | 1035 | *nb_sectors_ptr = length; |
fc01f7e7 | 1036 | } |
cf98951b | 1037 | |
f3d54fc4 AL |
1038 | struct partition { |
1039 | uint8_t boot_ind; /* 0x80 - active */ | |
1040 | uint8_t head; /* starting head */ | |
1041 | uint8_t sector; /* starting sector */ | |
1042 | uint8_t cyl; /* starting cylinder */ | |
1043 | uint8_t sys_ind; /* What partition type */ | |
1044 | uint8_t end_head; /* end head */ | |
1045 | uint8_t end_sector; /* end sector */ | |
1046 | uint8_t end_cyl; /* end cylinder */ | |
1047 | uint32_t start_sect; /* starting sector counting from 0 */ | |
1048 | uint32_t nr_sects; /* nr of sectors in partition */ | |
1049 | } __attribute__((packed)); | |
1050 | ||
1051 | /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */ | |
1052 | static int guess_disk_lchs(BlockDriverState *bs, | |
1053 | int *pcylinders, int *pheads, int *psectors) | |
1054 | { | |
1055 | uint8_t buf[512]; | |
1056 | int ret, i, heads, sectors, cylinders; | |
1057 | struct partition *p; | |
1058 | uint32_t nr_sects; | |
a38131b6 | 1059 | uint64_t nb_sectors; |
f3d54fc4 AL |
1060 | |
1061 | bdrv_get_geometry(bs, &nb_sectors); | |
1062 | ||
1063 | ret = bdrv_read(bs, 0, buf, 1); | |
1064 | if (ret < 0) | |
1065 | return -1; | |
1066 | /* test msdos magic */ | |
1067 | if (buf[510] != 0x55 || buf[511] != 0xaa) | |
1068 | return -1; | |
1069 | for(i = 0; i < 4; i++) { | |
1070 | p = ((struct partition *)(buf + 0x1be)) + i; | |
1071 | nr_sects = le32_to_cpu(p->nr_sects); | |
1072 | if (nr_sects && p->end_head) { | |
1073 | /* We make the assumption that the partition terminates on | |
1074 | a cylinder boundary */ | |
1075 | heads = p->end_head + 1; | |
1076 | sectors = p->end_sector & 63; | |
1077 | if (sectors == 0) | |
1078 | continue; | |
1079 | cylinders = nb_sectors / (heads * sectors); | |
1080 | if (cylinders < 1 || cylinders > 16383) | |
1081 | continue; | |
1082 | *pheads = heads; | |
1083 | *psectors = sectors; | |
1084 | *pcylinders = cylinders; | |
1085 | #if 0 | |
1086 | printf("guessed geometry: LCHS=%d %d %d\n", | |
1087 | cylinders, heads, sectors); | |
1088 | #endif | |
1089 | return 0; | |
1090 | } | |
1091 | } | |
1092 | return -1; | |
1093 | } | |
1094 | ||
1095 | void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) | |
1096 | { | |
1097 | int translation, lba_detected = 0; | |
1098 | int cylinders, heads, secs; | |
a38131b6 | 1099 | uint64_t nb_sectors; |
f3d54fc4 AL |
1100 | |
1101 | /* if a geometry hint is available, use it */ | |
1102 | bdrv_get_geometry(bs, &nb_sectors); | |
1103 | bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); | |
1104 | translation = bdrv_get_translation_hint(bs); | |
1105 | if (cylinders != 0) { | |
1106 | *pcyls = cylinders; | |
1107 | *pheads = heads; | |
1108 | *psecs = secs; | |
1109 | } else { | |
1110 | if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { | |
1111 | if (heads > 16) { | |
1112 | /* if heads > 16, it means that a BIOS LBA | |
1113 | translation was active, so the default | |
1114 | hardware geometry is OK */ | |
1115 | lba_detected = 1; | |
1116 | goto default_geometry; | |
1117 | } else { | |
1118 | *pcyls = cylinders; | |
1119 | *pheads = heads; | |
1120 | *psecs = secs; | |
1121 | /* disable any translation to be in sync with | |
1122 | the logical geometry */ | |
1123 | if (translation == BIOS_ATA_TRANSLATION_AUTO) { | |
1124 | bdrv_set_translation_hint(bs, | |
1125 | BIOS_ATA_TRANSLATION_NONE); | |
1126 | } | |
1127 | } | |
1128 | } else { | |
1129 | default_geometry: | |
1130 | /* if no geometry, use a standard physical disk geometry */ | |
1131 | cylinders = nb_sectors / (16 * 63); | |
1132 | ||
1133 | if (cylinders > 16383) | |
1134 | cylinders = 16383; | |
1135 | else if (cylinders < 2) | |
1136 | cylinders = 2; | |
1137 | *pcyls = cylinders; | |
1138 | *pheads = 16; | |
1139 | *psecs = 63; | |
1140 | if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { | |
1141 | if ((*pcyls * *pheads) <= 131072) { | |
1142 | bdrv_set_translation_hint(bs, | |
1143 | BIOS_ATA_TRANSLATION_LARGE); | |
1144 | } else { | |
1145 | bdrv_set_translation_hint(bs, | |
1146 | BIOS_ATA_TRANSLATION_LBA); | |
1147 | } | |
1148 | } | |
1149 | } | |
1150 | bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); | |
1151 | } | |
1152 | } | |
1153 | ||
5fafdf24 | 1154 | void bdrv_set_geometry_hint(BlockDriverState *bs, |
b338082b FB |
1155 | int cyls, int heads, int secs) |
1156 | { | |
1157 | bs->cyls = cyls; | |
1158 | bs->heads = heads; | |
1159 | bs->secs = secs; | |
1160 | } | |
1161 | ||
1162 | void bdrv_set_type_hint(BlockDriverState *bs, int type) | |
1163 | { | |
1164 | bs->type = type; | |
1165 | bs->removable = ((type == BDRV_TYPE_CDROM || | |
1166 | type == BDRV_TYPE_FLOPPY)); | |
1167 | } | |
1168 | ||
46d4767d FB |
1169 | void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
1170 | { | |
1171 | bs->translation = translation; | |
1172 | } | |
1173 | ||
5fafdf24 | 1174 | void bdrv_get_geometry_hint(BlockDriverState *bs, |
b338082b FB |
1175 | int *pcyls, int *pheads, int *psecs) |
1176 | { | |
1177 | *pcyls = bs->cyls; | |
1178 | *pheads = bs->heads; | |
1179 | *psecs = bs->secs; | |
1180 | } | |
1181 | ||
1182 | int bdrv_get_type_hint(BlockDriverState *bs) | |
1183 | { | |
1184 | return bs->type; | |
1185 | } | |
1186 | ||
46d4767d FB |
1187 | int bdrv_get_translation_hint(BlockDriverState *bs) |
1188 | { | |
1189 | return bs->translation; | |
1190 | } | |
1191 | ||
b338082b FB |
1192 | int bdrv_is_removable(BlockDriverState *bs) |
1193 | { | |
1194 | return bs->removable; | |
1195 | } | |
1196 | ||
1197 | int bdrv_is_read_only(BlockDriverState *bs) | |
1198 | { | |
1199 | return bs->read_only; | |
1200 | } | |
1201 | ||
985a03b0 TS |
1202 | int bdrv_is_sg(BlockDriverState *bs) |
1203 | { | |
1204 | return bs->sg; | |
1205 | } | |
1206 | ||
e900a7b7 CH |
1207 | int bdrv_enable_write_cache(BlockDriverState *bs) |
1208 | { | |
1209 | return bs->enable_write_cache; | |
1210 | } | |
1211 | ||
19cb3738 | 1212 | /* XXX: no longer used */ |
5fafdf24 | 1213 | void bdrv_set_change_cb(BlockDriverState *bs, |
b338082b FB |
1214 | void (*change_cb)(void *opaque), void *opaque) |
1215 | { | |
1216 | bs->change_cb = change_cb; | |
1217 | bs->change_opaque = opaque; | |
1218 | } | |
1219 | ||
ea2384d3 FB |
1220 | int bdrv_is_encrypted(BlockDriverState *bs) |
1221 | { | |
1222 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
1223 | return 1; | |
1224 | return bs->encrypted; | |
1225 | } | |
1226 | ||
c0f4ce77 AL |
1227 | int bdrv_key_required(BlockDriverState *bs) |
1228 | { | |
1229 | BlockDriverState *backing_hd = bs->backing_hd; | |
1230 | ||
1231 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) | |
1232 | return 1; | |
1233 | return (bs->encrypted && !bs->valid_key); | |
1234 | } | |
1235 | ||
ea2384d3 FB |
1236 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
1237 | { | |
1238 | int ret; | |
1239 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
1240 | ret = bdrv_set_key(bs->backing_hd, key); | |
1241 | if (ret < 0) | |
1242 | return ret; | |
1243 | if (!bs->encrypted) | |
1244 | return 0; | |
1245 | } | |
fd04a2ae SH |
1246 | if (!bs->encrypted) { |
1247 | return -EINVAL; | |
1248 | } else if (!bs->drv || !bs->drv->bdrv_set_key) { | |
1249 | return -ENOMEDIUM; | |
1250 | } | |
c0f4ce77 | 1251 | ret = bs->drv->bdrv_set_key(bs, key); |
bb5fc20f AL |
1252 | if (ret < 0) { |
1253 | bs->valid_key = 0; | |
1254 | } else if (!bs->valid_key) { | |
1255 | bs->valid_key = 1; | |
1256 | /* call the change callback now, we skipped it on open */ | |
1257 | bs->media_changed = 1; | |
1258 | if (bs->change_cb) | |
1259 | bs->change_cb(bs->change_opaque); | |
1260 | } | |
c0f4ce77 | 1261 | return ret; |
ea2384d3 FB |
1262 | } |
1263 | ||
1264 | void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) | |
1265 | { | |
19cb3738 | 1266 | if (!bs->drv) { |
ea2384d3 FB |
1267 | buf[0] = '\0'; |
1268 | } else { | |
1269 | pstrcpy(buf, buf_size, bs->drv->format_name); | |
1270 | } | |
1271 | } | |
1272 | ||
5fafdf24 | 1273 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
ea2384d3 FB |
1274 | void *opaque) |
1275 | { | |
1276 | BlockDriver *drv; | |
1277 | ||
8a22f02a | 1278 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
ea2384d3 FB |
1279 | it(opaque, drv->format_name); |
1280 | } | |
1281 | } | |
1282 | ||
b338082b FB |
1283 | BlockDriverState *bdrv_find(const char *name) |
1284 | { | |
1285 | BlockDriverState *bs; | |
1286 | ||
1b7bdbc1 SH |
1287 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
1288 | if (!strcmp(name, bs->device_name)) { | |
b338082b | 1289 | return bs; |
1b7bdbc1 | 1290 | } |
b338082b FB |
1291 | } |
1292 | return NULL; | |
1293 | } | |
1294 | ||
51de9760 | 1295 | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
81d0912d FB |
1296 | { |
1297 | BlockDriverState *bs; | |
1298 | ||
1b7bdbc1 | 1299 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
51de9760 | 1300 | it(opaque, bs); |
81d0912d FB |
1301 | } |
1302 | } | |
1303 | ||
ea2384d3 FB |
1304 | const char *bdrv_get_device_name(BlockDriverState *bs) |
1305 | { | |
1306 | return bs->device_name; | |
1307 | } | |
1308 | ||
7a6cba61 PB |
1309 | void bdrv_flush(BlockDriverState *bs) |
1310 | { | |
3f5075ae | 1311 | if (bs->drv && bs->drv->bdrv_flush) |
7a6cba61 | 1312 | bs->drv->bdrv_flush(bs); |
7a6cba61 PB |
1313 | } |
1314 | ||
c6ca28d6 AL |
1315 | void bdrv_flush_all(void) |
1316 | { | |
1317 | BlockDriverState *bs; | |
1318 | ||
1b7bdbc1 SH |
1319 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
1320 | if (bs->drv && !bdrv_is_read_only(bs) && | |
1321 | (!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) { | |
c6ca28d6 | 1322 | bdrv_flush(bs); |
1b7bdbc1 SH |
1323 | } |
1324 | } | |
c6ca28d6 AL |
1325 | } |
1326 | ||
f2feebbd KW |
1327 | int bdrv_has_zero_init(BlockDriverState *bs) |
1328 | { | |
1329 | assert(bs->drv); | |
1330 | ||
1331 | if (bs->drv->no_zero_init) { | |
1332 | return 0; | |
1333 | } else if (bs->file) { | |
1334 | return bdrv_has_zero_init(bs->file); | |
1335 | } | |
1336 | ||
1337 | return 1; | |
1338 | } | |
1339 | ||
f58c7b35 TS |
1340 | /* |
1341 | * Returns true iff the specified sector is present in the disk image. Drivers | |
1342 | * not implementing the functionality are assumed to not support backing files, | |
1343 | * hence all their sectors are reported as allocated. | |
1344 | * | |
1345 | * 'pnum' is set to the number of sectors (including and immediately following | |
1346 | * the specified sector) that are known to be in the same | |
1347 | * allocated/unallocated state. | |
1348 | * | |
1349 | * 'nb_sectors' is the max value 'pnum' should be set to. | |
1350 | */ | |
1351 | int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, | |
1352 | int *pnum) | |
1353 | { | |
1354 | int64_t n; | |
1355 | if (!bs->drv->bdrv_is_allocated) { | |
1356 | if (sector_num >= bs->total_sectors) { | |
1357 | *pnum = 0; | |
1358 | return 0; | |
1359 | } | |
1360 | n = bs->total_sectors - sector_num; | |
1361 | *pnum = (n < nb_sectors) ? (n) : (nb_sectors); | |
1362 | return 1; | |
1363 | } | |
1364 | return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum); | |
1365 | } | |
1366 | ||
2582bfed LC |
1367 | void bdrv_mon_event(const BlockDriverState *bdrv, |
1368 | BlockMonEventAction action, int is_read) | |
1369 | { | |
1370 | QObject *data; | |
1371 | const char *action_str; | |
1372 | ||
1373 | switch (action) { | |
1374 | case BDRV_ACTION_REPORT: | |
1375 | action_str = "report"; | |
1376 | break; | |
1377 | case BDRV_ACTION_IGNORE: | |
1378 | action_str = "ignore"; | |
1379 | break; | |
1380 | case BDRV_ACTION_STOP: | |
1381 | action_str = "stop"; | |
1382 | break; | |
1383 | default: | |
1384 | abort(); | |
1385 | } | |
1386 | ||
1387 | data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }", | |
1388 | bdrv->device_name, | |
1389 | action_str, | |
1390 | is_read ? "read" : "write"); | |
1391 | monitor_protocol_event(QEVENT_BLOCK_IO_ERROR, data); | |
1392 | ||
1393 | qobject_decref(data); | |
1394 | } | |
1395 | ||
d15e5465 | 1396 | static void bdrv_print_dict(QObject *obj, void *opaque) |
b338082b | 1397 | { |
d15e5465 LC |
1398 | QDict *bs_dict; |
1399 | Monitor *mon = opaque; | |
1400 | ||
1401 | bs_dict = qobject_to_qdict(obj); | |
1402 | ||
1403 | monitor_printf(mon, "%s: type=%s removable=%d", | |
1404 | qdict_get_str(bs_dict, "device"), | |
1405 | qdict_get_str(bs_dict, "type"), | |
1406 | qdict_get_bool(bs_dict, "removable")); | |
1407 | ||
1408 | if (qdict_get_bool(bs_dict, "removable")) { | |
1409 | monitor_printf(mon, " locked=%d", qdict_get_bool(bs_dict, "locked")); | |
1410 | } | |
1411 | ||
1412 | if (qdict_haskey(bs_dict, "inserted")) { | |
1413 | QDict *qdict = qobject_to_qdict(qdict_get(bs_dict, "inserted")); | |
1414 | ||
1415 | monitor_printf(mon, " file="); | |
1416 | monitor_print_filename(mon, qdict_get_str(qdict, "file")); | |
1417 | if (qdict_haskey(qdict, "backing_file")) { | |
1418 | monitor_printf(mon, " backing_file="); | |
1419 | monitor_print_filename(mon, qdict_get_str(qdict, "backing_file")); | |
1420 | } | |
1421 | monitor_printf(mon, " ro=%d drv=%s encrypted=%d", | |
1422 | qdict_get_bool(qdict, "ro"), | |
1423 | qdict_get_str(qdict, "drv"), | |
1424 | qdict_get_bool(qdict, "encrypted")); | |
1425 | } else { | |
1426 | monitor_printf(mon, " [not inserted]"); | |
1427 | } | |
1428 | ||
1429 | monitor_printf(mon, "\n"); | |
1430 | } | |
1431 | ||
1432 | void bdrv_info_print(Monitor *mon, const QObject *data) | |
1433 | { | |
1434 | qlist_iter(qobject_to_qlist(data), bdrv_print_dict, mon); | |
1435 | } | |
1436 | ||
1437 | /** | |
1438 | * bdrv_info(): Block devices information | |
1439 | * | |
1440 | * Each block device information is stored in a QDict and the | |
1441 | * returned QObject is a QList of all devices. | |
1442 | * | |
1443 | * The QDict contains the following: | |
1444 | * | |
1445 | * - "device": device name | |
1446 | * - "type": device type | |
1447 | * - "removable": true if the device is removable, false otherwise | |
1448 | * - "locked": true if the device is locked, false otherwise | |
1449 | * - "inserted": only present if the device is inserted, it is a QDict | |
1450 | * containing the following: | |
1451 | * - "file": device file name | |
1452 | * - "ro": true if read-only, false otherwise | |
1453 | * - "drv": driver format name | |
1454 | * - "backing_file": backing file name if one is used | |
1455 | * - "encrypted": true if encrypted, false otherwise | |
1456 | * | |
1457 | * Example: | |
1458 | * | |
1459 | * [ { "device": "ide0-hd0", "type": "hd", "removable": false, "locked": false, | |
1460 | * "inserted": { "file": "/tmp/foobar", "ro": false, "drv": "qcow2" } }, | |
1461 | * { "device": "floppy0", "type": "floppy", "removable": true, | |
1462 | * "locked": false } ] | |
1463 | */ | |
1464 | void bdrv_info(Monitor *mon, QObject **ret_data) | |
1465 | { | |
1466 | QList *bs_list; | |
b338082b FB |
1467 | BlockDriverState *bs; |
1468 | ||
d15e5465 LC |
1469 | bs_list = qlist_new(); |
1470 | ||
1b7bdbc1 | 1471 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
d15e5465 LC |
1472 | QObject *bs_obj; |
1473 | const char *type = "unknown"; | |
1474 | ||
b338082b FB |
1475 | switch(bs->type) { |
1476 | case BDRV_TYPE_HD: | |
d15e5465 | 1477 | type = "hd"; |
b338082b FB |
1478 | break; |
1479 | case BDRV_TYPE_CDROM: | |
d15e5465 | 1480 | type = "cdrom"; |
b338082b FB |
1481 | break; |
1482 | case BDRV_TYPE_FLOPPY: | |
d15e5465 | 1483 | type = "floppy"; |
b338082b FB |
1484 | break; |
1485 | } | |
d15e5465 LC |
1486 | |
1487 | bs_obj = qobject_from_jsonf("{ 'device': %s, 'type': %s, " | |
1488 | "'removable': %i, 'locked': %i }", | |
1489 | bs->device_name, type, bs->removable, | |
1490 | bs->locked); | |
d15e5465 | 1491 | |
19cb3738 | 1492 | if (bs->drv) { |
d15e5465 LC |
1493 | QObject *obj; |
1494 | QDict *bs_dict = qobject_to_qdict(bs_obj); | |
1495 | ||
1496 | obj = qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, " | |
1497 | "'encrypted': %i }", | |
1498 | bs->filename, bs->read_only, | |
1499 | bs->drv->format_name, | |
1500 | bdrv_is_encrypted(bs)); | |
fef30743 | 1501 | if (bs->backing_file[0] != '\0') { |
d15e5465 LC |
1502 | QDict *qdict = qobject_to_qdict(obj); |
1503 | qdict_put(qdict, "backing_file", | |
1504 | qstring_from_str(bs->backing_file)); | |
376253ec | 1505 | } |
d15e5465 LC |
1506 | |
1507 | qdict_put_obj(bs_dict, "inserted", obj); | |
b338082b | 1508 | } |
d15e5465 | 1509 | qlist_append_obj(bs_list, bs_obj); |
b338082b | 1510 | } |
d15e5465 LC |
1511 | |
1512 | *ret_data = QOBJECT(bs_list); | |
b338082b | 1513 | } |
a36e69dd | 1514 | |
218a536a | 1515 | static void bdrv_stats_iter(QObject *data, void *opaque) |
a36e69dd | 1516 | { |
218a536a LC |
1517 | QDict *qdict; |
1518 | Monitor *mon = opaque; | |
1519 | ||
1520 | qdict = qobject_to_qdict(data); | |
1521 | monitor_printf(mon, "%s:", qdict_get_str(qdict, "device")); | |
1522 | ||
1523 | qdict = qobject_to_qdict(qdict_get(qdict, "stats")); | |
1524 | monitor_printf(mon, " rd_bytes=%" PRId64 | |
1525 | " wr_bytes=%" PRId64 | |
1526 | " rd_operations=%" PRId64 | |
1527 | " wr_operations=%" PRId64 | |
1528 | "\n", | |
1529 | qdict_get_int(qdict, "rd_bytes"), | |
1530 | qdict_get_int(qdict, "wr_bytes"), | |
1531 | qdict_get_int(qdict, "rd_operations"), | |
1532 | qdict_get_int(qdict, "wr_operations")); | |
1533 | } | |
1534 | ||
1535 | void bdrv_stats_print(Monitor *mon, const QObject *data) | |
1536 | { | |
1537 | qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon); | |
1538 | } | |
1539 | ||
294cc35f KW |
1540 | static QObject* bdrv_info_stats_bs(BlockDriverState *bs) |
1541 | { | |
1542 | QObject *res; | |
1543 | QDict *dict; | |
1544 | ||
1545 | res = qobject_from_jsonf("{ 'stats': {" | |
1546 | "'rd_bytes': %" PRId64 "," | |
1547 | "'wr_bytes': %" PRId64 "," | |
1548 | "'rd_operations': %" PRId64 "," | |
1549 | "'wr_operations': %" PRId64 "," | |
1550 | "'wr_highest_offset': %" PRId64 | |
1551 | "} }", | |
1552 | bs->rd_bytes, bs->wr_bytes, | |
1553 | bs->rd_ops, bs->wr_ops, | |
1554 | bs->wr_highest_sector * 512); | |
1555 | dict = qobject_to_qdict(res); | |
1556 | ||
1557 | if (*bs->device_name) { | |
1558 | qdict_put(dict, "device", qstring_from_str(bs->device_name)); | |
1559 | } | |
1560 | ||
1561 | if (bs->file) { | |
1562 | QObject *parent = bdrv_info_stats_bs(bs->file); | |
1563 | qdict_put_obj(dict, "parent", parent); | |
1564 | } | |
1565 | ||
1566 | return res; | |
1567 | } | |
1568 | ||
218a536a LC |
1569 | /** |
1570 | * bdrv_info_stats(): show block device statistics | |
1571 | * | |
1572 | * Each device statistic information is stored in a QDict and | |
1573 | * the returned QObject is a QList of all devices. | |
1574 | * | |
1575 | * The QDict contains the following: | |
1576 | * | |
1577 | * - "device": device name | |
1578 | * - "stats": A QDict with the statistics information, it contains: | |
1579 | * - "rd_bytes": bytes read | |
1580 | * - "wr_bytes": bytes written | |
1581 | * - "rd_operations": read operations | |
1582 | * - "wr_operations": write operations | |
294cc35f KW |
1583 | * - "wr_highest_offset": Highest offset of a sector written since the |
1584 | * BlockDriverState has been opened | |
1585 | * - "parent": Contains recursively the statistics of the underlying | |
1586 | * protocol (e.g. the host file for a qcow2 image). If there is no | |
1587 | * underlying protocol, this field is omitted. | |
1588 | * | |
218a536a LC |
1589 | * Example: |
1590 | * | |
1591 | * [ { "device": "ide0-hd0", | |
1592 | * "stats": { "rd_bytes": 512, | |
1593 | * "wr_bytes": 0, | |
1594 | * "rd_operations": 1, | |
294cc35f KW |
1595 | * "wr_operations": 0, |
1596 | * "wr_highest_offset": 0, | |
1597 | * "parent": { | |
1598 | * "stats": { "rd_bytes": 1024, | |
1599 | * "wr_bytes": 0, | |
1600 | * "rd_operations": 2, | |
1601 | * "wr_operations": 0, | |
1602 | * "wr_highest_offset": 0, | |
1603 | * } | |
1604 | * } } }, | |
218a536a LC |
1605 | * { "device": "ide1-cd0", |
1606 | * "stats": { "rd_bytes": 0, | |
1607 | * "wr_bytes": 0, | |
1608 | * "rd_operations": 0, | |
294cc35f KW |
1609 | * "wr_operations": 0, |
1610 | * "wr_highest_offset": 0 } }, | |
218a536a LC |
1611 | */ |
1612 | void bdrv_info_stats(Monitor *mon, QObject **ret_data) | |
1613 | { | |
1614 | QObject *obj; | |
1615 | QList *devices; | |
a36e69dd TS |
1616 | BlockDriverState *bs; |
1617 | ||
218a536a LC |
1618 | devices = qlist_new(); |
1619 | ||
1b7bdbc1 | 1620 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
294cc35f | 1621 | obj = bdrv_info_stats_bs(bs); |
218a536a | 1622 | qlist_append_obj(devices, obj); |
a36e69dd | 1623 | } |
218a536a LC |
1624 | |
1625 | *ret_data = QOBJECT(devices); | |
a36e69dd | 1626 | } |
ea2384d3 | 1627 | |
045df330 AL |
1628 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
1629 | { | |
1630 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
1631 | return bs->backing_file; | |
1632 | else if (bs->encrypted) | |
1633 | return bs->filename; | |
1634 | else | |
1635 | return NULL; | |
1636 | } | |
1637 | ||
5fafdf24 | 1638 | void bdrv_get_backing_filename(BlockDriverState *bs, |
83f64091 FB |
1639 | char *filename, int filename_size) |
1640 | { | |
b783e409 | 1641 | if (!bs->backing_file) { |
83f64091 FB |
1642 | pstrcpy(filename, filename_size, ""); |
1643 | } else { | |
1644 | pstrcpy(filename, filename_size, bs->backing_file); | |
1645 | } | |
1646 | } | |
1647 | ||
5fafdf24 | 1648 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
faea38e7 FB |
1649 | const uint8_t *buf, int nb_sectors) |
1650 | { | |
1651 | BlockDriver *drv = bs->drv; | |
1652 | if (!drv) | |
19cb3738 | 1653 | return -ENOMEDIUM; |
faea38e7 FB |
1654 | if (!drv->bdrv_write_compressed) |
1655 | return -ENOTSUP; | |
fbb7b4e0 KW |
1656 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
1657 | return -EIO; | |
a55eb92c | 1658 | |
c6d22830 | 1659 | if (bs->dirty_bitmap) { |
7cd1e32a | 1660 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
1661 | } | |
a55eb92c | 1662 | |
faea38e7 FB |
1663 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
1664 | } | |
3b46e624 | 1665 | |
faea38e7 FB |
1666 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
1667 | { | |
1668 | BlockDriver *drv = bs->drv; | |
1669 | if (!drv) | |
19cb3738 | 1670 | return -ENOMEDIUM; |
faea38e7 FB |
1671 | if (!drv->bdrv_get_info) |
1672 | return -ENOTSUP; | |
1673 | memset(bdi, 0, sizeof(*bdi)); | |
1674 | return drv->bdrv_get_info(bs, bdi); | |
1675 | } | |
1676 | ||
45566e9c CH |
1677 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
1678 | int64_t pos, int size) | |
178e08a5 AL |
1679 | { |
1680 | BlockDriver *drv = bs->drv; | |
1681 | if (!drv) | |
1682 | return -ENOMEDIUM; | |
45566e9c | 1683 | if (!drv->bdrv_save_vmstate) |
178e08a5 | 1684 | return -ENOTSUP; |
45566e9c | 1685 | return drv->bdrv_save_vmstate(bs, buf, pos, size); |
178e08a5 AL |
1686 | } |
1687 | ||
45566e9c CH |
1688 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
1689 | int64_t pos, int size) | |
178e08a5 AL |
1690 | { |
1691 | BlockDriver *drv = bs->drv; | |
1692 | if (!drv) | |
1693 | return -ENOMEDIUM; | |
45566e9c | 1694 | if (!drv->bdrv_load_vmstate) |
178e08a5 | 1695 | return -ENOTSUP; |
45566e9c | 1696 | return drv->bdrv_load_vmstate(bs, buf, pos, size); |
178e08a5 AL |
1697 | } |
1698 | ||
8b9b0cc2 KW |
1699 | void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event) |
1700 | { | |
1701 | BlockDriver *drv = bs->drv; | |
1702 | ||
1703 | if (!drv || !drv->bdrv_debug_event) { | |
1704 | return; | |
1705 | } | |
1706 | ||
1707 | return drv->bdrv_debug_event(bs, event); | |
1708 | ||
1709 | } | |
1710 | ||
faea38e7 FB |
1711 | /**************************************************************/ |
1712 | /* handling of snapshots */ | |
1713 | ||
5fafdf24 | 1714 | int bdrv_snapshot_create(BlockDriverState *bs, |
faea38e7 FB |
1715 | QEMUSnapshotInfo *sn_info) |
1716 | { | |
1717 | BlockDriver *drv = bs->drv; | |
1718 | if (!drv) | |
19cb3738 | 1719 | return -ENOMEDIUM; |
faea38e7 FB |
1720 | if (!drv->bdrv_snapshot_create) |
1721 | return -ENOTSUP; | |
1722 | return drv->bdrv_snapshot_create(bs, sn_info); | |
1723 | } | |
1724 | ||
5fafdf24 | 1725 | int bdrv_snapshot_goto(BlockDriverState *bs, |
faea38e7 FB |
1726 | const char *snapshot_id) |
1727 | { | |
1728 | BlockDriver *drv = bs->drv; | |
1729 | if (!drv) | |
19cb3738 | 1730 | return -ENOMEDIUM; |
faea38e7 FB |
1731 | if (!drv->bdrv_snapshot_goto) |
1732 | return -ENOTSUP; | |
1733 | return drv->bdrv_snapshot_goto(bs, snapshot_id); | |
1734 | } | |
1735 | ||
1736 | int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) | |
1737 | { | |
1738 | BlockDriver *drv = bs->drv; | |
1739 | if (!drv) | |
19cb3738 | 1740 | return -ENOMEDIUM; |
faea38e7 FB |
1741 | if (!drv->bdrv_snapshot_delete) |
1742 | return -ENOTSUP; | |
1743 | return drv->bdrv_snapshot_delete(bs, snapshot_id); | |
1744 | } | |
1745 | ||
5fafdf24 | 1746 | int bdrv_snapshot_list(BlockDriverState *bs, |
faea38e7 FB |
1747 | QEMUSnapshotInfo **psn_info) |
1748 | { | |
1749 | BlockDriver *drv = bs->drv; | |
1750 | if (!drv) | |
19cb3738 | 1751 | return -ENOMEDIUM; |
faea38e7 FB |
1752 | if (!drv->bdrv_snapshot_list) |
1753 | return -ENOTSUP; | |
1754 | return drv->bdrv_snapshot_list(bs, psn_info); | |
1755 | } | |
1756 | ||
1757 | #define NB_SUFFIXES 4 | |
1758 | ||
1759 | char *get_human_readable_size(char *buf, int buf_size, int64_t size) | |
1760 | { | |
1761 | static const char suffixes[NB_SUFFIXES] = "KMGT"; | |
1762 | int64_t base; | |
1763 | int i; | |
1764 | ||
1765 | if (size <= 999) { | |
1766 | snprintf(buf, buf_size, "%" PRId64, size); | |
1767 | } else { | |
1768 | base = 1024; | |
1769 | for(i = 0; i < NB_SUFFIXES; i++) { | |
1770 | if (size < (10 * base)) { | |
5fafdf24 | 1771 | snprintf(buf, buf_size, "%0.1f%c", |
faea38e7 FB |
1772 | (double)size / base, |
1773 | suffixes[i]); | |
1774 | break; | |
1775 | } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { | |
5fafdf24 | 1776 | snprintf(buf, buf_size, "%" PRId64 "%c", |
faea38e7 FB |
1777 | ((size + (base >> 1)) / base), |
1778 | suffixes[i]); | |
1779 | break; | |
1780 | } | |
1781 | base = base * 1024; | |
1782 | } | |
1783 | } | |
1784 | return buf; | |
1785 | } | |
1786 | ||
1787 | char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) | |
1788 | { | |
1789 | char buf1[128], date_buf[128], clock_buf[128]; | |
3b9f94e1 FB |
1790 | #ifdef _WIN32 |
1791 | struct tm *ptm; | |
1792 | #else | |
faea38e7 | 1793 | struct tm tm; |
3b9f94e1 | 1794 | #endif |
faea38e7 FB |
1795 | time_t ti; |
1796 | int64_t secs; | |
1797 | ||
1798 | if (!sn) { | |
5fafdf24 TS |
1799 | snprintf(buf, buf_size, |
1800 | "%-10s%-20s%7s%20s%15s", | |
faea38e7 FB |
1801 | "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
1802 | } else { | |
1803 | ti = sn->date_sec; | |
3b9f94e1 FB |
1804 | #ifdef _WIN32 |
1805 | ptm = localtime(&ti); | |
1806 | strftime(date_buf, sizeof(date_buf), | |
1807 | "%Y-%m-%d %H:%M:%S", ptm); | |
1808 | #else | |
faea38e7 FB |
1809 | localtime_r(&ti, &tm); |
1810 | strftime(date_buf, sizeof(date_buf), | |
1811 | "%Y-%m-%d %H:%M:%S", &tm); | |
3b9f94e1 | 1812 | #endif |
faea38e7 FB |
1813 | secs = sn->vm_clock_nsec / 1000000000; |
1814 | snprintf(clock_buf, sizeof(clock_buf), | |
1815 | "%02d:%02d:%02d.%03d", | |
1816 | (int)(secs / 3600), | |
1817 | (int)((secs / 60) % 60), | |
5fafdf24 | 1818 | (int)(secs % 60), |
faea38e7 FB |
1819 | (int)((sn->vm_clock_nsec / 1000000) % 1000)); |
1820 | snprintf(buf, buf_size, | |
5fafdf24 | 1821 | "%-10s%-20s%7s%20s%15s", |
faea38e7 FB |
1822 | sn->id_str, sn->name, |
1823 | get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), | |
1824 | date_buf, | |
1825 | clock_buf); | |
1826 | } | |
1827 | return buf; | |
1828 | } | |
1829 | ||
83f64091 | 1830 | |
ea2384d3 | 1831 | /**************************************************************/ |
83f64091 | 1832 | /* async I/Os */ |
ea2384d3 | 1833 | |
3b69e4b9 | 1834 | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
f141eafe | 1835 | QEMUIOVector *qiov, int nb_sectors, |
3b69e4b9 | 1836 | BlockDriverCompletionFunc *cb, void *opaque) |
83f64091 FB |
1837 | { |
1838 | BlockDriver *drv = bs->drv; | |
a36e69dd | 1839 | BlockDriverAIOCB *ret; |
83f64091 | 1840 | |
19cb3738 | 1841 | if (!drv) |
ce1a14dc | 1842 | return NULL; |
71d0770c AL |
1843 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
1844 | return NULL; | |
3b46e624 | 1845 | |
f141eafe AL |
1846 | ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors, |
1847 | cb, opaque); | |
a36e69dd TS |
1848 | |
1849 | if (ret) { | |
1850 | /* Update stats even though technically transfer has not happened. */ | |
6ea44308 | 1851 | bs->rd_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE; |
a36e69dd TS |
1852 | bs->rd_ops ++; |
1853 | } | |
1854 | ||
1855 | return ret; | |
ea2384d3 FB |
1856 | } |
1857 | ||
f141eafe AL |
1858 | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
1859 | QEMUIOVector *qiov, int nb_sectors, | |
1860 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 1861 | { |
83f64091 | 1862 | BlockDriver *drv = bs->drv; |
a36e69dd | 1863 | BlockDriverAIOCB *ret; |
ea2384d3 | 1864 | |
19cb3738 | 1865 | if (!drv) |
ce1a14dc | 1866 | return NULL; |
83f64091 | 1867 | if (bs->read_only) |
ce1a14dc | 1868 | return NULL; |
71d0770c AL |
1869 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
1870 | return NULL; | |
83f64091 | 1871 | |
c6d22830 | 1872 | if (bs->dirty_bitmap) { |
7cd1e32a | 1873 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
1874 | } | |
a55eb92c | 1875 | |
f141eafe AL |
1876 | ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors, |
1877 | cb, opaque); | |
a36e69dd TS |
1878 | |
1879 | if (ret) { | |
294cc35f KW |
1880 | /* Update stats even though technically transfer has not happened. */ |
1881 | bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE; | |
1882 | bs->wr_ops ++; | |
1883 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { | |
1884 | bs->wr_highest_sector = sector_num + nb_sectors - 1; | |
1885 | } | |
a36e69dd TS |
1886 | } |
1887 | ||
1888 | return ret; | |
83f64091 FB |
1889 | } |
1890 | ||
40b4f539 KW |
1891 | |
1892 | typedef struct MultiwriteCB { | |
1893 | int error; | |
1894 | int num_requests; | |
1895 | int num_callbacks; | |
1896 | struct { | |
1897 | BlockDriverCompletionFunc *cb; | |
1898 | void *opaque; | |
1899 | QEMUIOVector *free_qiov; | |
1900 | void *free_buf; | |
1901 | } callbacks[]; | |
1902 | } MultiwriteCB; | |
1903 | ||
1904 | static void multiwrite_user_cb(MultiwriteCB *mcb) | |
1905 | { | |
1906 | int i; | |
1907 | ||
1908 | for (i = 0; i < mcb->num_callbacks; i++) { | |
1909 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); | |
1e1ea48d SH |
1910 | if (mcb->callbacks[i].free_qiov) { |
1911 | qemu_iovec_destroy(mcb->callbacks[i].free_qiov); | |
1912 | } | |
40b4f539 | 1913 | qemu_free(mcb->callbacks[i].free_qiov); |
f8a83245 | 1914 | qemu_vfree(mcb->callbacks[i].free_buf); |
40b4f539 KW |
1915 | } |
1916 | } | |
1917 | ||
1918 | static void multiwrite_cb(void *opaque, int ret) | |
1919 | { | |
1920 | MultiwriteCB *mcb = opaque; | |
1921 | ||
cb6d3ca0 | 1922 | if (ret < 0 && !mcb->error) { |
40b4f539 KW |
1923 | mcb->error = ret; |
1924 | multiwrite_user_cb(mcb); | |
1925 | } | |
1926 | ||
1927 | mcb->num_requests--; | |
1928 | if (mcb->num_requests == 0) { | |
1929 | if (mcb->error == 0) { | |
1930 | multiwrite_user_cb(mcb); | |
1931 | } | |
1932 | qemu_free(mcb); | |
1933 | } | |
1934 | } | |
1935 | ||
1936 | static int multiwrite_req_compare(const void *a, const void *b) | |
1937 | { | |
1938 | return (((BlockRequest*) a)->sector - ((BlockRequest*) b)->sector); | |
1939 | } | |
1940 | ||
1941 | /* | |
1942 | * Takes a bunch of requests and tries to merge them. Returns the number of | |
1943 | * requests that remain after merging. | |
1944 | */ | |
1945 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, | |
1946 | int num_reqs, MultiwriteCB *mcb) | |
1947 | { | |
1948 | int i, outidx; | |
1949 | ||
1950 | // Sort requests by start sector | |
1951 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); | |
1952 | ||
1953 | // Check if adjacent requests touch the same clusters. If so, combine them, | |
1954 | // filling up gaps with zero sectors. | |
1955 | outidx = 0; | |
1956 | for (i = 1; i < num_reqs; i++) { | |
1957 | int merge = 0; | |
1958 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; | |
1959 | ||
1960 | // This handles the cases that are valid for all block drivers, namely | |
1961 | // exactly sequential writes and overlapping writes. | |
1962 | if (reqs[i].sector <= oldreq_last) { | |
1963 | merge = 1; | |
1964 | } | |
1965 | ||
1966 | // The block driver may decide that it makes sense to combine requests | |
1967 | // even if there is a gap of some sectors between them. In this case, | |
1968 | // the gap is filled with zeros (therefore only applicable for yet | |
1969 | // unused space in format like qcow2). | |
1970 | if (!merge && bs->drv->bdrv_merge_requests) { | |
1971 | merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]); | |
1972 | } | |
1973 | ||
e2a305fb CH |
1974 | if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
1975 | merge = 0; | |
1976 | } | |
1977 | ||
40b4f539 KW |
1978 | if (merge) { |
1979 | size_t size; | |
1980 | QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov)); | |
1981 | qemu_iovec_init(qiov, | |
1982 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); | |
1983 | ||
1984 | // Add the first request to the merged one. If the requests are | |
1985 | // overlapping, drop the last sectors of the first request. | |
1986 | size = (reqs[i].sector - reqs[outidx].sector) << 9; | |
1987 | qemu_iovec_concat(qiov, reqs[outidx].qiov, size); | |
1988 | ||
1989 | // We might need to add some zeros between the two requests | |
1990 | if (reqs[i].sector > oldreq_last) { | |
1991 | size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9; | |
1992 | uint8_t *buf = qemu_blockalign(bs, zero_bytes); | |
1993 | memset(buf, 0, zero_bytes); | |
1994 | qemu_iovec_add(qiov, buf, zero_bytes); | |
1995 | mcb->callbacks[i].free_buf = buf; | |
1996 | } | |
1997 | ||
1998 | // Add the second request | |
1999 | qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size); | |
2000 | ||
2001 | reqs[outidx].nb_sectors += reqs[i].nb_sectors; | |
2002 | reqs[outidx].qiov = qiov; | |
2003 | ||
2004 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; | |
2005 | } else { | |
2006 | outidx++; | |
2007 | reqs[outidx].sector = reqs[i].sector; | |
2008 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; | |
2009 | reqs[outidx].qiov = reqs[i].qiov; | |
2010 | } | |
2011 | } | |
2012 | ||
2013 | return outidx + 1; | |
2014 | } | |
2015 | ||
2016 | /* | |
2017 | * Submit multiple AIO write requests at once. | |
2018 | * | |
2019 | * On success, the function returns 0 and all requests in the reqs array have | |
2020 | * been submitted. In error case this function returns -1, and any of the | |
2021 | * requests may or may not be submitted yet. In particular, this means that the | |
2022 | * callback will be called for some of the requests, for others it won't. The | |
2023 | * caller must check the error field of the BlockRequest to wait for the right | |
2024 | * callbacks (if error != 0, no callback will be called). | |
2025 | * | |
2026 | * The implementation may modify the contents of the reqs array, e.g. to merge | |
2027 | * requests. However, the fields opaque and error are left unmodified as they | |
2028 | * are used to signal failure for a single request to the caller. | |
2029 | */ | |
2030 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) | |
2031 | { | |
2032 | BlockDriverAIOCB *acb; | |
2033 | MultiwriteCB *mcb; | |
2034 | int i; | |
2035 | ||
2036 | if (num_reqs == 0) { | |
2037 | return 0; | |
2038 | } | |
2039 | ||
2040 | // Create MultiwriteCB structure | |
2041 | mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); | |
2042 | mcb->num_requests = 0; | |
2043 | mcb->num_callbacks = num_reqs; | |
2044 | ||
2045 | for (i = 0; i < num_reqs; i++) { | |
2046 | mcb->callbacks[i].cb = reqs[i].cb; | |
2047 | mcb->callbacks[i].opaque = reqs[i].opaque; | |
2048 | } | |
2049 | ||
2050 | // Check for mergable requests | |
2051 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); | |
2052 | ||
2053 | // Run the aio requests | |
2054 | for (i = 0; i < num_reqs; i++) { | |
2055 | acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, | |
2056 | reqs[i].nb_sectors, multiwrite_cb, mcb); | |
2057 | ||
2058 | if (acb == NULL) { | |
2059 | // We can only fail the whole thing if no request has been | |
2060 | // submitted yet. Otherwise we'll wait for the submitted AIOs to | |
2061 | // complete and report the error in the callback. | |
2062 | if (mcb->num_requests == 0) { | |
0f0b604b | 2063 | reqs[i].error = -EIO; |
40b4f539 KW |
2064 | goto fail; |
2065 | } else { | |
7eb58a6c KW |
2066 | mcb->num_requests++; |
2067 | multiwrite_cb(mcb, -EIO); | |
40b4f539 KW |
2068 | break; |
2069 | } | |
2070 | } else { | |
2071 | mcb->num_requests++; | |
2072 | } | |
2073 | } | |
2074 | ||
2075 | return 0; | |
2076 | ||
2077 | fail: | |
af474591 | 2078 | qemu_free(mcb); |
40b4f539 KW |
2079 | return -1; |
2080 | } | |
2081 | ||
b2e12bc6 CH |
2082 | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
2083 | BlockDriverCompletionFunc *cb, void *opaque) | |
2084 | { | |
2085 | BlockDriver *drv = bs->drv; | |
2086 | ||
2087 | if (!drv) | |
2088 | return NULL; | |
b2e12bc6 CH |
2089 | return drv->bdrv_aio_flush(bs, cb, opaque); |
2090 | } | |
2091 | ||
83f64091 | 2092 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
83f64091 | 2093 | { |
6bbff9a0 | 2094 | acb->pool->cancel(acb); |
83f64091 FB |
2095 | } |
2096 | ||
ce1a14dc | 2097 | |
83f64091 FB |
2098 | /**************************************************************/ |
2099 | /* async block device emulation */ | |
2100 | ||
c16b5a2c CH |
2101 | typedef struct BlockDriverAIOCBSync { |
2102 | BlockDriverAIOCB common; | |
2103 | QEMUBH *bh; | |
2104 | int ret; | |
2105 | /* vector translation state */ | |
2106 | QEMUIOVector *qiov; | |
2107 | uint8_t *bounce; | |
2108 | int is_write; | |
2109 | } BlockDriverAIOCBSync; | |
2110 | ||
2111 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) | |
2112 | { | |
b666d239 KW |
2113 | BlockDriverAIOCBSync *acb = |
2114 | container_of(blockacb, BlockDriverAIOCBSync, common); | |
6a7ad299 | 2115 | qemu_bh_delete(acb->bh); |
36afc451 | 2116 | acb->bh = NULL; |
c16b5a2c CH |
2117 | qemu_aio_release(acb); |
2118 | } | |
2119 | ||
2120 | static AIOPool bdrv_em_aio_pool = { | |
2121 | .aiocb_size = sizeof(BlockDriverAIOCBSync), | |
2122 | .cancel = bdrv_aio_cancel_em, | |
2123 | }; | |
2124 | ||
ce1a14dc | 2125 | static void bdrv_aio_bh_cb(void *opaque) |
83f64091 | 2126 | { |
ce1a14dc | 2127 | BlockDriverAIOCBSync *acb = opaque; |
f141eafe | 2128 | |
f141eafe AL |
2129 | if (!acb->is_write) |
2130 | qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); | |
ceb42de8 | 2131 | qemu_vfree(acb->bounce); |
ce1a14dc | 2132 | acb->common.cb(acb->common.opaque, acb->ret); |
6a7ad299 | 2133 | qemu_bh_delete(acb->bh); |
36afc451 | 2134 | acb->bh = NULL; |
ce1a14dc | 2135 | qemu_aio_release(acb); |
83f64091 | 2136 | } |
beac80cd | 2137 | |
f141eafe AL |
2138 | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
2139 | int64_t sector_num, | |
2140 | QEMUIOVector *qiov, | |
2141 | int nb_sectors, | |
2142 | BlockDriverCompletionFunc *cb, | |
2143 | void *opaque, | |
2144 | int is_write) | |
2145 | ||
83f64091 | 2146 | { |
ce1a14dc | 2147 | BlockDriverAIOCBSync *acb; |
ce1a14dc | 2148 | |
c16b5a2c | 2149 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
f141eafe AL |
2150 | acb->is_write = is_write; |
2151 | acb->qiov = qiov; | |
e268ca52 | 2152 | acb->bounce = qemu_blockalign(bs, qiov->size); |
f141eafe | 2153 | |
ce1a14dc PB |
2154 | if (!acb->bh) |
2155 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
f141eafe AL |
2156 | |
2157 | if (is_write) { | |
2158 | qemu_iovec_to_buffer(acb->qiov, acb->bounce); | |
2159 | acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors); | |
2160 | } else { | |
2161 | acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors); | |
2162 | } | |
2163 | ||
ce1a14dc | 2164 | qemu_bh_schedule(acb->bh); |
f141eafe | 2165 | |
ce1a14dc | 2166 | return &acb->common; |
beac80cd FB |
2167 | } |
2168 | ||
f141eafe AL |
2169 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
2170 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 2171 | BlockDriverCompletionFunc *cb, void *opaque) |
beac80cd | 2172 | { |
f141eafe AL |
2173 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
2174 | } | |
83f64091 | 2175 | |
f141eafe AL |
2176 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
2177 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
2178 | BlockDriverCompletionFunc *cb, void *opaque) | |
2179 | { | |
2180 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); | |
beac80cd | 2181 | } |
beac80cd | 2182 | |
b2e12bc6 CH |
2183 | static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, |
2184 | BlockDriverCompletionFunc *cb, void *opaque) | |
2185 | { | |
2186 | BlockDriverAIOCBSync *acb; | |
2187 | ||
2188 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); | |
2189 | acb->is_write = 1; /* don't bounce in the completion hadler */ | |
2190 | acb->qiov = NULL; | |
2191 | acb->bounce = NULL; | |
2192 | acb->ret = 0; | |
2193 | ||
2194 | if (!acb->bh) | |
2195 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
2196 | ||
2197 | bdrv_flush(bs); | |
2198 | qemu_bh_schedule(acb->bh); | |
2199 | return &acb->common; | |
2200 | } | |
2201 | ||
83f64091 FB |
2202 | /**************************************************************/ |
2203 | /* sync block device emulation */ | |
ea2384d3 | 2204 | |
83f64091 FB |
2205 | static void bdrv_rw_em_cb(void *opaque, int ret) |
2206 | { | |
2207 | *(int *)opaque = ret; | |
ea2384d3 FB |
2208 | } |
2209 | ||
83f64091 FB |
2210 | #define NOT_DONE 0x7fffffff |
2211 | ||
5fafdf24 | 2212 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
83f64091 | 2213 | uint8_t *buf, int nb_sectors) |
7a6cba61 | 2214 | { |
ce1a14dc PB |
2215 | int async_ret; |
2216 | BlockDriverAIOCB *acb; | |
f141eafe AL |
2217 | struct iovec iov; |
2218 | QEMUIOVector qiov; | |
83f64091 | 2219 | |
65d6b3d8 KW |
2220 | async_context_push(); |
2221 | ||
83f64091 | 2222 | async_ret = NOT_DONE; |
3f4cb3d3 | 2223 | iov.iov_base = (void *)buf; |
f141eafe AL |
2224 | iov.iov_len = nb_sectors * 512; |
2225 | qemu_iovec_init_external(&qiov, &iov, 1); | |
2226 | acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors, | |
2227 | bdrv_rw_em_cb, &async_ret); | |
65d6b3d8 KW |
2228 | if (acb == NULL) { |
2229 | async_ret = -1; | |
2230 | goto fail; | |
2231 | } | |
baf35cb9 | 2232 | |
83f64091 FB |
2233 | while (async_ret == NOT_DONE) { |
2234 | qemu_aio_wait(); | |
2235 | } | |
baf35cb9 | 2236 | |
65d6b3d8 KW |
2237 | |
2238 | fail: | |
2239 | async_context_pop(); | |
83f64091 | 2240 | return async_ret; |
7a6cba61 PB |
2241 | } |
2242 | ||
83f64091 FB |
2243 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
2244 | const uint8_t *buf, int nb_sectors) | |
2245 | { | |
ce1a14dc PB |
2246 | int async_ret; |
2247 | BlockDriverAIOCB *acb; | |
f141eafe AL |
2248 | struct iovec iov; |
2249 | QEMUIOVector qiov; | |
83f64091 | 2250 | |
65d6b3d8 KW |
2251 | async_context_push(); |
2252 | ||
83f64091 | 2253 | async_ret = NOT_DONE; |
f141eafe AL |
2254 | iov.iov_base = (void *)buf; |
2255 | iov.iov_len = nb_sectors * 512; | |
2256 | qemu_iovec_init_external(&qiov, &iov, 1); | |
2257 | acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors, | |
2258 | bdrv_rw_em_cb, &async_ret); | |
65d6b3d8 KW |
2259 | if (acb == NULL) { |
2260 | async_ret = -1; | |
2261 | goto fail; | |
2262 | } | |
83f64091 FB |
2263 | while (async_ret == NOT_DONE) { |
2264 | qemu_aio_wait(); | |
2265 | } | |
65d6b3d8 KW |
2266 | |
2267 | fail: | |
2268 | async_context_pop(); | |
83f64091 FB |
2269 | return async_ret; |
2270 | } | |
ea2384d3 FB |
2271 | |
2272 | void bdrv_init(void) | |
2273 | { | |
5efa9d5a | 2274 | module_call_init(MODULE_INIT_BLOCK); |
ea2384d3 | 2275 | } |
ce1a14dc | 2276 | |
eb852011 MA |
2277 | void bdrv_init_with_whitelist(void) |
2278 | { | |
2279 | use_bdrv_whitelist = 1; | |
2280 | bdrv_init(); | |
2281 | } | |
2282 | ||
c16b5a2c CH |
2283 | void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs, |
2284 | BlockDriverCompletionFunc *cb, void *opaque) | |
ce1a14dc | 2285 | { |
ce1a14dc PB |
2286 | BlockDriverAIOCB *acb; |
2287 | ||
6bbff9a0 AL |
2288 | if (pool->free_aiocb) { |
2289 | acb = pool->free_aiocb; | |
2290 | pool->free_aiocb = acb->next; | |
ce1a14dc | 2291 | } else { |
6bbff9a0 AL |
2292 | acb = qemu_mallocz(pool->aiocb_size); |
2293 | acb->pool = pool; | |
ce1a14dc PB |
2294 | } |
2295 | acb->bs = bs; | |
2296 | acb->cb = cb; | |
2297 | acb->opaque = opaque; | |
2298 | return acb; | |
2299 | } | |
2300 | ||
2301 | void qemu_aio_release(void *p) | |
2302 | { | |
6bbff9a0 AL |
2303 | BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; |
2304 | AIOPool *pool = acb->pool; | |
2305 | acb->next = pool->free_aiocb; | |
2306 | pool->free_aiocb = acb; | |
ce1a14dc | 2307 | } |
19cb3738 FB |
2308 | |
2309 | /**************************************************************/ | |
2310 | /* removable device support */ | |
2311 | ||
2312 | /** | |
2313 | * Return TRUE if the media is present | |
2314 | */ | |
2315 | int bdrv_is_inserted(BlockDriverState *bs) | |
2316 | { | |
2317 | BlockDriver *drv = bs->drv; | |
2318 | int ret; | |
2319 | if (!drv) | |
2320 | return 0; | |
2321 | if (!drv->bdrv_is_inserted) | |
2322 | return 1; | |
2323 | ret = drv->bdrv_is_inserted(bs); | |
2324 | return ret; | |
2325 | } | |
2326 | ||
2327 | /** | |
2328 | * Return TRUE if the media changed since the last call to this | |
5fafdf24 | 2329 | * function. It is currently only used for floppy disks |
19cb3738 FB |
2330 | */ |
2331 | int bdrv_media_changed(BlockDriverState *bs) | |
2332 | { | |
2333 | BlockDriver *drv = bs->drv; | |
2334 | int ret; | |
2335 | ||
2336 | if (!drv || !drv->bdrv_media_changed) | |
2337 | ret = -ENOTSUP; | |
2338 | else | |
2339 | ret = drv->bdrv_media_changed(bs); | |
2340 | if (ret == -ENOTSUP) | |
2341 | ret = bs->media_changed; | |
2342 | bs->media_changed = 0; | |
2343 | return ret; | |
2344 | } | |
2345 | ||
2346 | /** | |
2347 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
2348 | */ | |
aea2a33c | 2349 | int bdrv_eject(BlockDriverState *bs, int eject_flag) |
19cb3738 FB |
2350 | { |
2351 | BlockDriver *drv = bs->drv; | |
2352 | int ret; | |
2353 | ||
aea2a33c MM |
2354 | if (bs->locked) { |
2355 | return -EBUSY; | |
2356 | } | |
2357 | ||
19cb3738 FB |
2358 | if (!drv || !drv->bdrv_eject) { |
2359 | ret = -ENOTSUP; | |
2360 | } else { | |
2361 | ret = drv->bdrv_eject(bs, eject_flag); | |
2362 | } | |
2363 | if (ret == -ENOTSUP) { | |
2364 | if (eject_flag) | |
2365 | bdrv_close(bs); | |
aea2a33c | 2366 | ret = 0; |
19cb3738 | 2367 | } |
aea2a33c MM |
2368 | |
2369 | return ret; | |
19cb3738 FB |
2370 | } |
2371 | ||
2372 | int bdrv_is_locked(BlockDriverState *bs) | |
2373 | { | |
2374 | return bs->locked; | |
2375 | } | |
2376 | ||
2377 | /** | |
2378 | * Lock or unlock the media (if it is locked, the user won't be able | |
2379 | * to eject it manually). | |
2380 | */ | |
2381 | void bdrv_set_locked(BlockDriverState *bs, int locked) | |
2382 | { | |
2383 | BlockDriver *drv = bs->drv; | |
2384 | ||
2385 | bs->locked = locked; | |
2386 | if (drv && drv->bdrv_set_locked) { | |
2387 | drv->bdrv_set_locked(bs, locked); | |
2388 | } | |
2389 | } | |
985a03b0 TS |
2390 | |
2391 | /* needed for generic scsi interface */ | |
2392 | ||
2393 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
2394 | { | |
2395 | BlockDriver *drv = bs->drv; | |
2396 | ||
2397 | if (drv && drv->bdrv_ioctl) | |
2398 | return drv->bdrv_ioctl(bs, req, buf); | |
2399 | return -ENOTSUP; | |
2400 | } | |
7d780669 | 2401 | |
221f715d AL |
2402 | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
2403 | unsigned long int req, void *buf, | |
2404 | BlockDriverCompletionFunc *cb, void *opaque) | |
7d780669 | 2405 | { |
221f715d | 2406 | BlockDriver *drv = bs->drv; |
7d780669 | 2407 | |
221f715d AL |
2408 | if (drv && drv->bdrv_aio_ioctl) |
2409 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); | |
2410 | return NULL; | |
7d780669 | 2411 | } |
e268ca52 | 2412 | |
7cd1e32a | 2413 | |
2414 | ||
e268ca52 AL |
2415 | void *qemu_blockalign(BlockDriverState *bs, size_t size) |
2416 | { | |
2417 | return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); | |
2418 | } | |
7cd1e32a | 2419 | |
2420 | void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable) | |
2421 | { | |
2422 | int64_t bitmap_size; | |
a55eb92c | 2423 | |
aaa0eb75 | 2424 | bs->dirty_count = 0; |
a55eb92c | 2425 | if (enable) { |
c6d22830 JK |
2426 | if (!bs->dirty_bitmap) { |
2427 | bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) + | |
2428 | BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1; | |
2429 | bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8; | |
a55eb92c | 2430 | |
7cd1e32a | 2431 | bs->dirty_bitmap = qemu_mallocz(bitmap_size); |
a55eb92c | 2432 | } |
7cd1e32a | 2433 | } else { |
c6d22830 | 2434 | if (bs->dirty_bitmap) { |
7cd1e32a | 2435 | qemu_free(bs->dirty_bitmap); |
c6d22830 | 2436 | bs->dirty_bitmap = NULL; |
a55eb92c | 2437 | } |
7cd1e32a | 2438 | } |
2439 | } | |
2440 | ||
2441 | int bdrv_get_dirty(BlockDriverState *bs, int64_t sector) | |
2442 | { | |
6ea44308 | 2443 | int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; |
a55eb92c | 2444 | |
c6d22830 JK |
2445 | if (bs->dirty_bitmap && |
2446 | (sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) { | |
2447 | return bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] & | |
2448 | (1 << (chunk % (sizeof(unsigned long) * 8))); | |
7cd1e32a | 2449 | } else { |
2450 | return 0; | |
2451 | } | |
2452 | } | |
2453 | ||
a55eb92c JK |
2454 | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, |
2455 | int nr_sectors) | |
7cd1e32a | 2456 | { |
2457 | set_dirty_bitmap(bs, cur_sector, nr_sectors, 0); | |
2458 | } | |
aaa0eb75 LS |
2459 | |
2460 | int64_t bdrv_get_dirty_count(BlockDriverState *bs) | |
2461 | { | |
2462 | return bs->dirty_count; | |
2463 | } |