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