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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" |
fc01f7e7 | 29 | |
71e72a19 | 30 | #ifdef CONFIG_BSD |
7674e7bf FB |
31 | #include <sys/types.h> |
32 | #include <sys/stat.h> | |
33 | #include <sys/ioctl.h> | |
72cf2d4f | 34 | #include <sys/queue.h> |
c5e97233 | 35 | #ifndef __DragonFly__ |
7674e7bf FB |
36 | #include <sys/disk.h> |
37 | #endif | |
c5e97233 | 38 | #endif |
7674e7bf | 39 | |
49dc768d AL |
40 | #ifdef _WIN32 |
41 | #include <windows.h> | |
42 | #endif | |
43 | ||
f141eafe AL |
44 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
45 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
c87c0672 | 46 | BlockDriverCompletionFunc *cb, void *opaque); |
f141eafe AL |
47 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
48 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 49 | BlockDriverCompletionFunc *cb, void *opaque); |
b2e12bc6 CH |
50 | static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, |
51 | BlockDriverCompletionFunc *cb, void *opaque); | |
5fafdf24 | 52 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
83f64091 FB |
53 | uint8_t *buf, int nb_sectors); |
54 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, | |
55 | const uint8_t *buf, int nb_sectors); | |
ec530c81 | 56 | |
7ee930d0 BS |
57 | BlockDriverState *bdrv_first; |
58 | ||
ea2384d3 FB |
59 | static BlockDriver *first_drv; |
60 | ||
eb852011 MA |
61 | /* If non-zero, use only whitelisted block drivers */ |
62 | static int use_bdrv_whitelist; | |
63 | ||
83f64091 | 64 | int path_is_absolute(const char *path) |
3b0d4f61 | 65 | { |
83f64091 | 66 | const char *p; |
21664424 FB |
67 | #ifdef _WIN32 |
68 | /* specific case for names like: "\\.\d:" */ | |
69 | if (*path == '/' || *path == '\\') | |
70 | return 1; | |
71 | #endif | |
83f64091 FB |
72 | p = strchr(path, ':'); |
73 | if (p) | |
74 | p++; | |
75 | else | |
76 | p = path; | |
3b9f94e1 FB |
77 | #ifdef _WIN32 |
78 | return (*p == '/' || *p == '\\'); | |
79 | #else | |
80 | return (*p == '/'); | |
81 | #endif | |
3b0d4f61 FB |
82 | } |
83 | ||
83f64091 FB |
84 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
85 | path to it by considering it is relative to base_path. URL are | |
86 | supported. */ | |
87 | void path_combine(char *dest, int dest_size, | |
88 | const char *base_path, | |
89 | const char *filename) | |
3b0d4f61 | 90 | { |
83f64091 FB |
91 | const char *p, *p1; |
92 | int len; | |
93 | ||
94 | if (dest_size <= 0) | |
95 | return; | |
96 | if (path_is_absolute(filename)) { | |
97 | pstrcpy(dest, dest_size, filename); | |
98 | } else { | |
99 | p = strchr(base_path, ':'); | |
100 | if (p) | |
101 | p++; | |
102 | else | |
103 | p = base_path; | |
3b9f94e1 FB |
104 | p1 = strrchr(base_path, '/'); |
105 | #ifdef _WIN32 | |
106 | { | |
107 | const char *p2; | |
108 | p2 = strrchr(base_path, '\\'); | |
109 | if (!p1 || p2 > p1) | |
110 | p1 = p2; | |
111 | } | |
112 | #endif | |
83f64091 FB |
113 | if (p1) |
114 | p1++; | |
115 | else | |
116 | p1 = base_path; | |
117 | if (p1 > p) | |
118 | p = p1; | |
119 | len = p - base_path; | |
120 | if (len > dest_size - 1) | |
121 | len = dest_size - 1; | |
122 | memcpy(dest, base_path, len); | |
123 | dest[len] = '\0'; | |
124 | pstrcat(dest, dest_size, filename); | |
3b0d4f61 | 125 | } |
3b0d4f61 FB |
126 | } |
127 | ||
5efa9d5a | 128 | void bdrv_register(BlockDriver *bdrv) |
ea2384d3 | 129 | { |
f141eafe | 130 | if (!bdrv->bdrv_aio_readv) { |
83f64091 | 131 | /* add AIO emulation layer */ |
f141eafe AL |
132 | bdrv->bdrv_aio_readv = bdrv_aio_readv_em; |
133 | bdrv->bdrv_aio_writev = bdrv_aio_writev_em; | |
eda578e5 | 134 | } else if (!bdrv->bdrv_read) { |
83f64091 FB |
135 | /* add synchronous IO emulation layer */ |
136 | bdrv->bdrv_read = bdrv_read_em; | |
137 | bdrv->bdrv_write = bdrv_write_em; | |
138 | } | |
b2e12bc6 CH |
139 | |
140 | if (!bdrv->bdrv_aio_flush) | |
141 | bdrv->bdrv_aio_flush = bdrv_aio_flush_em; | |
142 | ||
ea2384d3 FB |
143 | bdrv->next = first_drv; |
144 | first_drv = bdrv; | |
145 | } | |
b338082b FB |
146 | |
147 | /* create a new block device (by default it is empty) */ | |
148 | BlockDriverState *bdrv_new(const char *device_name) | |
149 | { | |
150 | BlockDriverState **pbs, *bs; | |
151 | ||
152 | bs = qemu_mallocz(sizeof(BlockDriverState)); | |
b338082b | 153 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); |
ea2384d3 FB |
154 | if (device_name[0] != '\0') { |
155 | /* insert at the end */ | |
156 | pbs = &bdrv_first; | |
157 | while (*pbs != NULL) | |
158 | pbs = &(*pbs)->next; | |
159 | *pbs = bs; | |
160 | } | |
b338082b FB |
161 | return bs; |
162 | } | |
163 | ||
ea2384d3 FB |
164 | BlockDriver *bdrv_find_format(const char *format_name) |
165 | { | |
166 | BlockDriver *drv1; | |
167 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { | |
168 | if (!strcmp(drv1->format_name, format_name)) | |
169 | return drv1; | |
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 | ||
d5249393 | 207 | #ifdef _WIN32 |
95389c86 | 208 | void get_tmp_filename(char *filename, int size) |
d5249393 | 209 | { |
3b9f94e1 | 210 | char temp_dir[MAX_PATH]; |
3b46e624 | 211 | |
3b9f94e1 FB |
212 | GetTempPath(MAX_PATH, temp_dir); |
213 | GetTempFileName(temp_dir, "qem", 0, filename); | |
d5249393 FB |
214 | } |
215 | #else | |
95389c86 | 216 | void get_tmp_filename(char *filename, int size) |
fc01f7e7 | 217 | { |
67b915a5 | 218 | int fd; |
7ccfb2eb | 219 | const char *tmpdir; |
d5249393 | 220 | /* XXX: race condition possible */ |
0badc1ee AJ |
221 | tmpdir = getenv("TMPDIR"); |
222 | if (!tmpdir) | |
223 | tmpdir = "/tmp"; | |
224 | snprintf(filename, size, "%s/vl.XXXXXX", tmpdir); | |
ea2384d3 FB |
225 | fd = mkstemp(filename); |
226 | close(fd); | |
227 | } | |
d5249393 | 228 | #endif |
fc01f7e7 | 229 | |
19cb3738 | 230 | #ifdef _WIN32 |
f45512fe FB |
231 | static int is_windows_drive_prefix(const char *filename) |
232 | { | |
233 | return (((filename[0] >= 'a' && filename[0] <= 'z') || | |
234 | (filename[0] >= 'A' && filename[0] <= 'Z')) && | |
235 | filename[1] == ':'); | |
236 | } | |
3b46e624 | 237 | |
508c7cb3 | 238 | int is_windows_drive(const char *filename) |
19cb3738 | 239 | { |
5fafdf24 | 240 | if (is_windows_drive_prefix(filename) && |
f45512fe | 241 | filename[2] == '\0') |
19cb3738 FB |
242 | return 1; |
243 | if (strstart(filename, "\\\\.\\", NULL) || | |
244 | strstart(filename, "//./", NULL)) | |
245 | return 1; | |
246 | return 0; | |
247 | } | |
248 | #endif | |
249 | ||
83f64091 FB |
250 | static BlockDriver *find_protocol(const char *filename) |
251 | { | |
252 | BlockDriver *drv1; | |
253 | char protocol[128]; | |
1cec71e3 | 254 | int len; |
83f64091 | 255 | const char *p; |
19cb3738 FB |
256 | |
257 | #ifdef _WIN32 | |
f45512fe FB |
258 | if (is_windows_drive(filename) || |
259 | is_windows_drive_prefix(filename)) | |
5efa9d5a | 260 | return bdrv_find_format("raw"); |
19cb3738 | 261 | #endif |
1cec71e3 AL |
262 | p = strchr(filename, ':'); |
263 | if (!p) | |
5efa9d5a | 264 | return bdrv_find_format("raw"); |
1cec71e3 AL |
265 | len = p - filename; |
266 | if (len > sizeof(protocol) - 1) | |
267 | len = sizeof(protocol) - 1; | |
268 | memcpy(protocol, filename, len); | |
269 | protocol[len] = '\0'; | |
83f64091 | 270 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
5fafdf24 | 271 | if (drv1->protocol_name && |
83f64091 FB |
272 | !strcmp(drv1->protocol_name, protocol)) |
273 | return drv1; | |
274 | } | |
275 | return NULL; | |
276 | } | |
277 | ||
f3a5d3f8 CH |
278 | /* |
279 | * Detect host devices. By convention, /dev/cdrom[N] is always | |
280 | * recognized as a host CDROM. | |
281 | */ | |
f3a5d3f8 CH |
282 | static BlockDriver *find_hdev_driver(const char *filename) |
283 | { | |
508c7cb3 CH |
284 | int score_max = 0, score; |
285 | BlockDriver *drv = NULL, *d; | |
f3a5d3f8 | 286 | |
508c7cb3 CH |
287 | for (d = first_drv; d; d = d->next) { |
288 | if (d->bdrv_probe_device) { | |
289 | score = d->bdrv_probe_device(filename); | |
290 | if (score > score_max) { | |
291 | score_max = score; | |
292 | drv = d; | |
293 | } | |
294 | } | |
19cb3738 | 295 | } |
f3a5d3f8 | 296 | |
508c7cb3 | 297 | return drv; |
f3a5d3f8 | 298 | } |
3b46e624 | 299 | |
f3a5d3f8 CH |
300 | static BlockDriver *find_image_format(const char *filename) |
301 | { | |
302 | int ret, score, score_max; | |
303 | BlockDriver *drv1, *drv; | |
304 | uint8_t buf[2048]; | |
305 | BlockDriverState *bs; | |
306 | ||
83f64091 | 307 | drv = find_protocol(filename); |
19cb3738 | 308 | /* no need to test disk image formats for vvfat */ |
c833ab73 | 309 | if (drv && strcmp(drv->format_name, "vvfat") == 0) |
83f64091 | 310 | return drv; |
19cb3738 | 311 | |
83f64091 FB |
312 | ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY); |
313 | if (ret < 0) | |
314 | return NULL; | |
315 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); | |
316 | bdrv_delete(bs); | |
317 | if (ret < 0) { | |
318 | return NULL; | |
319 | } | |
320 | ||
ea2384d3 FB |
321 | score_max = 0; |
322 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { | |
83f64091 FB |
323 | if (drv1->bdrv_probe) { |
324 | score = drv1->bdrv_probe(buf, ret, filename); | |
325 | if (score > score_max) { | |
326 | score_max = score; | |
327 | drv = drv1; | |
328 | } | |
0849bf08 | 329 | } |
fc01f7e7 | 330 | } |
ea2384d3 FB |
331 | return drv; |
332 | } | |
333 | ||
83f64091 | 334 | int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
ea2384d3 | 335 | { |
83f64091 FB |
336 | BlockDriverState *bs; |
337 | int ret; | |
338 | ||
339 | bs = bdrv_new(""); | |
83f64091 FB |
340 | ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL); |
341 | if (ret < 0) { | |
342 | bdrv_delete(bs); | |
343 | return ret; | |
3b0d4f61 | 344 | } |
71d0770c | 345 | bs->growable = 1; |
83f64091 FB |
346 | *pbs = bs; |
347 | return 0; | |
348 | } | |
349 | ||
350 | int bdrv_open(BlockDriverState *bs, const char *filename, int flags) | |
351 | { | |
352 | return bdrv_open2(bs, filename, flags, NULL); | |
ea2384d3 FB |
353 | } |
354 | ||
83f64091 | 355 | int bdrv_open2(BlockDriverState *bs, const char *filename, int flags, |
ea2384d3 FB |
356 | BlockDriver *drv) |
357 | { | |
59f2689d | 358 | int ret, open_flags, try_rw; |
eb5c851f TS |
359 | char tmp_filename[PATH_MAX]; |
360 | char backing_filename[PATH_MAX]; | |
3b46e624 | 361 | |
ea2384d3 FB |
362 | bs->is_temporary = 0; |
363 | bs->encrypted = 0; | |
c0f4ce77 | 364 | bs->valid_key = 0; |
e268ca52 AL |
365 | /* buffer_alignment defaulted to 512, drivers can change this value */ |
366 | bs->buffer_alignment = 512; | |
712e7874 | 367 | |
83f64091 | 368 | if (flags & BDRV_O_SNAPSHOT) { |
ea2384d3 FB |
369 | BlockDriverState *bs1; |
370 | int64_t total_size; | |
7c96d46e | 371 | int is_protocol = 0; |
91a073a9 KW |
372 | BlockDriver *bdrv_qcow2; |
373 | QEMUOptionParameter *options; | |
3b46e624 | 374 | |
ea2384d3 FB |
375 | /* if snapshot, we create a temporary backing file and open it |
376 | instead of opening 'filename' directly */ | |
33e3963e | 377 | |
ea2384d3 FB |
378 | /* if there is a backing file, use it */ |
379 | bs1 = bdrv_new(""); | |
5eb45639 | 380 | ret = bdrv_open2(bs1, filename, 0, drv); |
51d7c00c | 381 | if (ret < 0) { |
ea2384d3 | 382 | bdrv_delete(bs1); |
51d7c00c | 383 | return ret; |
ea2384d3 | 384 | } |
6ea44308 | 385 | total_size = bdrv_getlength(bs1) >> BDRV_SECTOR_BITS; |
7c96d46e AL |
386 | |
387 | if (bs1->drv && bs1->drv->protocol_name) | |
388 | is_protocol = 1; | |
389 | ||
ea2384d3 | 390 | bdrv_delete(bs1); |
3b46e624 | 391 | |
ea2384d3 | 392 | get_tmp_filename(tmp_filename, sizeof(tmp_filename)); |
7c96d46e AL |
393 | |
394 | /* Real path is meaningless for protocols */ | |
395 | if (is_protocol) | |
396 | snprintf(backing_filename, sizeof(backing_filename), | |
397 | "%s", filename); | |
398 | else | |
399 | realpath(filename, backing_filename); | |
400 | ||
91a073a9 KW |
401 | bdrv_qcow2 = bdrv_find_format("qcow2"); |
402 | options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); | |
403 | ||
404 | set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size * 512); | |
405 | set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); | |
406 | if (drv) { | |
407 | set_option_parameter(options, BLOCK_OPT_BACKING_FMT, | |
408 | drv->format_name); | |
409 | } | |
410 | ||
411 | ret = bdrv_create(bdrv_qcow2, tmp_filename, options); | |
51d7c00c AL |
412 | if (ret < 0) { |
413 | return ret; | |
ea2384d3 | 414 | } |
91a073a9 | 415 | |
ea2384d3 | 416 | filename = tmp_filename; |
91a073a9 | 417 | drv = bdrv_qcow2; |
ea2384d3 FB |
418 | bs->is_temporary = 1; |
419 | } | |
712e7874 | 420 | |
ea2384d3 | 421 | pstrcpy(bs->filename, sizeof(bs->filename), filename); |
83f64091 FB |
422 | if (flags & BDRV_O_FILE) { |
423 | drv = find_protocol(filename); | |
51d7c00c | 424 | } else if (!drv) { |
f3a5d3f8 CH |
425 | drv = find_hdev_driver(filename); |
426 | if (!drv) { | |
427 | drv = find_image_format(filename); | |
428 | } | |
51d7c00c AL |
429 | } |
430 | if (!drv) { | |
431 | ret = -ENOENT; | |
432 | goto unlink_and_fail; | |
ea2384d3 FB |
433 | } |
434 | bs->drv = drv; | |
435 | bs->opaque = qemu_mallocz(drv->instance_size); | |
e900a7b7 CH |
436 | |
437 | /* | |
438 | * Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a | |
439 | * write cache to the guest. We do need the fdatasync to flush | |
440 | * out transactions for block allocations, and we maybe have a | |
441 | * volatile write cache in our backing device to deal with. | |
442 | */ | |
443 | if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE)) | |
444 | bs->enable_write_cache = 1; | |
445 | ||
83f64091 FB |
446 | /* Note: for compatibility, we open disk image files as RDWR, and |
447 | RDONLY as fallback */ | |
59f2689d | 448 | try_rw = !bs->read_only || bs->is_temporary; |
83f64091 | 449 | if (!(flags & BDRV_O_FILE)) |
59f2689d NS |
450 | open_flags = (try_rw ? BDRV_O_RDWR : 0) | |
451 | (flags & (BDRV_O_CACHE_MASK|BDRV_O_NATIVE_AIO)); | |
83f64091 FB |
452 | else |
453 | open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT); | |
eb852011 MA |
454 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) |
455 | ret = -ENOTSUP; | |
456 | else | |
457 | ret = drv->bdrv_open(bs, filename, open_flags); | |
a0a83536 | 458 | if ((ret == -EACCES || ret == -EPERM) && !(flags & BDRV_O_FILE)) { |
1cec71e3 | 459 | ret = drv->bdrv_open(bs, filename, open_flags & ~BDRV_O_RDWR); |
83f64091 FB |
460 | bs->read_only = 1; |
461 | } | |
ea2384d3 FB |
462 | if (ret < 0) { |
463 | qemu_free(bs->opaque); | |
6b21b973 FB |
464 | bs->opaque = NULL; |
465 | bs->drv = NULL; | |
51d7c00c AL |
466 | unlink_and_fail: |
467 | if (bs->is_temporary) | |
468 | unlink(filename); | |
83f64091 | 469 | return ret; |
33e3963e | 470 | } |
d15a771d | 471 | if (drv->bdrv_getlength) { |
6ea44308 | 472 | bs->total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
d15a771d | 473 | } |
67b915a5 | 474 | #ifndef _WIN32 |
ea2384d3 FB |
475 | if (bs->is_temporary) { |
476 | unlink(filename); | |
477 | } | |
478 | #endif | |
83f64091 | 479 | if (bs->backing_file[0] != '\0') { |
ea2384d3 | 480 | /* if there is a backing file, use it */ |
5eb45639 | 481 | BlockDriver *back_drv = NULL; |
ea2384d3 | 482 | bs->backing_hd = bdrv_new(""); |
59f2689d NS |
483 | /* pass on read_only property to the backing_hd */ |
484 | bs->backing_hd->read_only = bs->read_only; | |
83f64091 FB |
485 | path_combine(backing_filename, sizeof(backing_filename), |
486 | filename, bs->backing_file); | |
5eb45639 AL |
487 | if (bs->backing_format[0] != '\0') |
488 | back_drv = bdrv_find_format(bs->backing_format); | |
489 | ret = bdrv_open2(bs->backing_hd, backing_filename, open_flags, | |
490 | back_drv); | |
51d7c00c AL |
491 | if (ret < 0) { |
492 | bdrv_close(bs); | |
493 | return ret; | |
494 | } | |
33e3963e FB |
495 | } |
496 | ||
bb5fc20f AL |
497 | if (!bdrv_key_required(bs)) { |
498 | /* call the change callback */ | |
499 | bs->media_changed = 1; | |
500 | if (bs->change_cb) | |
501 | bs->change_cb(bs->change_opaque); | |
502 | } | |
b338082b | 503 | return 0; |
fc01f7e7 FB |
504 | } |
505 | ||
506 | void bdrv_close(BlockDriverState *bs) | |
507 | { | |
19cb3738 | 508 | if (bs->drv) { |
ea2384d3 FB |
509 | if (bs->backing_hd) |
510 | bdrv_delete(bs->backing_hd); | |
511 | bs->drv->bdrv_close(bs); | |
512 | qemu_free(bs->opaque); | |
513 | #ifdef _WIN32 | |
514 | if (bs->is_temporary) { | |
515 | unlink(bs->filename); | |
516 | } | |
67b915a5 | 517 | #endif |
ea2384d3 FB |
518 | bs->opaque = NULL; |
519 | bs->drv = NULL; | |
b338082b FB |
520 | |
521 | /* call the change callback */ | |
19cb3738 | 522 | bs->media_changed = 1; |
b338082b FB |
523 | if (bs->change_cb) |
524 | bs->change_cb(bs->change_opaque); | |
525 | } | |
526 | } | |
527 | ||
528 | void bdrv_delete(BlockDriverState *bs) | |
529 | { | |
34c6f050 AJ |
530 | BlockDriverState **pbs; |
531 | ||
532 | pbs = &bdrv_first; | |
533 | while (*pbs != bs && *pbs != NULL) | |
534 | pbs = &(*pbs)->next; | |
535 | if (*pbs == bs) | |
536 | *pbs = bs->next; | |
537 | ||
b338082b FB |
538 | bdrv_close(bs); |
539 | qemu_free(bs); | |
fc01f7e7 FB |
540 | } |
541 | ||
e97fc193 AL |
542 | /* |
543 | * Run consistency checks on an image | |
544 | * | |
545 | * Returns the number of errors or -errno when an internal error occurs | |
546 | */ | |
547 | int bdrv_check(BlockDriverState *bs) | |
548 | { | |
549 | if (bs->drv->bdrv_check == NULL) { | |
550 | return -ENOTSUP; | |
551 | } | |
552 | ||
553 | return bs->drv->bdrv_check(bs); | |
554 | } | |
555 | ||
33e3963e FB |
556 | /* commit COW file into the raw image */ |
557 | int bdrv_commit(BlockDriverState *bs) | |
558 | { | |
19cb3738 | 559 | BlockDriver *drv = bs->drv; |
83f64091 | 560 | int64_t i, total_sectors; |
ea2384d3 FB |
561 | int n, j; |
562 | unsigned char sector[512]; | |
33e3963e | 563 | |
19cb3738 FB |
564 | if (!drv) |
565 | return -ENOMEDIUM; | |
33e3963e FB |
566 | |
567 | if (bs->read_only) { | |
ea2384d3 | 568 | return -EACCES; |
33e3963e FB |
569 | } |
570 | ||
ea2384d3 FB |
571 | if (!bs->backing_hd) { |
572 | return -ENOTSUP; | |
573 | } | |
33e3963e | 574 | |
6ea44308 | 575 | total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
83f64091 | 576 | for (i = 0; i < total_sectors;) { |
19cb3738 | 577 | if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { |
ea2384d3 FB |
578 | for(j = 0; j < n; j++) { |
579 | if (bdrv_read(bs, i, sector, 1) != 0) { | |
580 | return -EIO; | |
581 | } | |
582 | ||
583 | if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { | |
584 | return -EIO; | |
585 | } | |
586 | i++; | |
33e3963e | 587 | } |
ea2384d3 FB |
588 | } else { |
589 | i += n; | |
590 | } | |
33e3963e | 591 | } |
95389c86 | 592 | |
19cb3738 FB |
593 | if (drv->bdrv_make_empty) |
594 | return drv->bdrv_make_empty(bs); | |
95389c86 | 595 | |
33e3963e FB |
596 | return 0; |
597 | } | |
598 | ||
71d0770c AL |
599 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
600 | size_t size) | |
601 | { | |
602 | int64_t len; | |
603 | ||
604 | if (!bdrv_is_inserted(bs)) | |
605 | return -ENOMEDIUM; | |
606 | ||
607 | if (bs->growable) | |
608 | return 0; | |
609 | ||
610 | len = bdrv_getlength(bs); | |
611 | ||
fbb7b4e0 KW |
612 | if (offset < 0) |
613 | return -EIO; | |
614 | ||
615 | if ((offset > len) || (len - offset < size)) | |
71d0770c AL |
616 | return -EIO; |
617 | ||
618 | return 0; | |
619 | } | |
620 | ||
621 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, | |
622 | int nb_sectors) | |
623 | { | |
999dec57 | 624 | return bdrv_check_byte_request(bs, sector_num * 512, nb_sectors * 512); |
71d0770c AL |
625 | } |
626 | ||
19cb3738 | 627 | /* return < 0 if error. See bdrv_write() for the return codes */ |
5fafdf24 | 628 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
629 | uint8_t *buf, int nb_sectors) |
630 | { | |
ea2384d3 FB |
631 | BlockDriver *drv = bs->drv; |
632 | ||
19cb3738 FB |
633 | if (!drv) |
634 | return -ENOMEDIUM; | |
71d0770c AL |
635 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
636 | return -EIO; | |
b338082b | 637 | |
eda578e5 | 638 | return drv->bdrv_read(bs, sector_num, buf, nb_sectors); |
fc01f7e7 FB |
639 | } |
640 | ||
7cd1e32a | 641 | static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num, |
a55eb92c | 642 | int nb_sectors, int dirty) |
7cd1e32a | 643 | { |
644 | int64_t start, end; | |
a55eb92c | 645 | |
6ea44308 JK |
646 | start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; |
647 | end = (sector_num + nb_sectors) / BDRV_SECTORS_PER_DIRTY_CHUNK; | |
a55eb92c JK |
648 | |
649 | for (; start <= end; start++) { | |
7cd1e32a | 650 | bs->dirty_bitmap[start] = dirty; |
651 | } | |
652 | } | |
653 | ||
5fafdf24 | 654 | /* Return < 0 if error. Important errors are: |
19cb3738 FB |
655 | -EIO generic I/O error (may happen for all errors) |
656 | -ENOMEDIUM No media inserted. | |
657 | -EINVAL Invalid sector number or nb_sectors | |
658 | -EACCES Trying to write a read-only device | |
659 | */ | |
5fafdf24 | 660 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
661 | const uint8_t *buf, int nb_sectors) |
662 | { | |
83f64091 | 663 | BlockDriver *drv = bs->drv; |
19cb3738 FB |
664 | if (!bs->drv) |
665 | return -ENOMEDIUM; | |
0849bf08 | 666 | if (bs->read_only) |
19cb3738 | 667 | return -EACCES; |
71d0770c AL |
668 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
669 | return -EIO; | |
a55eb92c JK |
670 | |
671 | if (bs->dirty_tracking) { | |
7cd1e32a | 672 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
673 | } | |
a55eb92c | 674 | |
42fb2807 | 675 | return drv->bdrv_write(bs, sector_num, buf, nb_sectors); |
83f64091 FB |
676 | } |
677 | ||
eda578e5 AL |
678 | int bdrv_pread(BlockDriverState *bs, int64_t offset, |
679 | void *buf, int count1) | |
83f64091 | 680 | { |
6ea44308 | 681 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
682 | int len, nb_sectors, count; |
683 | int64_t sector_num; | |
684 | ||
685 | count = count1; | |
686 | /* first read to align to sector start */ | |
6ea44308 | 687 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
688 | if (len > count) |
689 | len = count; | |
6ea44308 | 690 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 FB |
691 | if (len > 0) { |
692 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
693 | return -EIO; | |
6ea44308 | 694 | memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len); |
83f64091 FB |
695 | count -= len; |
696 | if (count == 0) | |
697 | return count1; | |
698 | sector_num++; | |
699 | buf += len; | |
700 | } | |
701 | ||
702 | /* read the sectors "in place" */ | |
6ea44308 | 703 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 FB |
704 | if (nb_sectors > 0) { |
705 | if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0) | |
706 | return -EIO; | |
707 | sector_num += nb_sectors; | |
6ea44308 | 708 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
709 | buf += len; |
710 | count -= len; | |
711 | } | |
712 | ||
713 | /* add data from the last sector */ | |
714 | if (count > 0) { | |
715 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
716 | return -EIO; | |
717 | memcpy(buf, tmp_buf, count); | |
718 | } | |
719 | return count1; | |
720 | } | |
721 | ||
eda578e5 AL |
722 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, |
723 | const void *buf, int count1) | |
83f64091 | 724 | { |
6ea44308 | 725 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
726 | int len, nb_sectors, count; |
727 | int64_t sector_num; | |
728 | ||
729 | count = count1; | |
730 | /* first write to align to sector start */ | |
6ea44308 | 731 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
732 | if (len > count) |
733 | len = count; | |
6ea44308 | 734 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 FB |
735 | if (len > 0) { |
736 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
737 | return -EIO; | |
6ea44308 | 738 | memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len); |
83f64091 FB |
739 | if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) |
740 | return -EIO; | |
741 | count -= len; | |
742 | if (count == 0) | |
743 | return count1; | |
744 | sector_num++; | |
745 | buf += len; | |
746 | } | |
747 | ||
748 | /* write the sectors "in place" */ | |
6ea44308 | 749 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 FB |
750 | if (nb_sectors > 0) { |
751 | if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0) | |
752 | return -EIO; | |
753 | sector_num += nb_sectors; | |
6ea44308 | 754 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
755 | buf += len; |
756 | count -= len; | |
757 | } | |
758 | ||
759 | /* add data from the last sector */ | |
760 | if (count > 0) { | |
761 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
762 | return -EIO; | |
763 | memcpy(tmp_buf, buf, count); | |
764 | if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) | |
765 | return -EIO; | |
766 | } | |
767 | return count1; | |
768 | } | |
83f64091 | 769 | |
83f64091 FB |
770 | /** |
771 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
772 | */ | |
773 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
774 | { | |
775 | BlockDriver *drv = bs->drv; | |
776 | if (!drv) | |
19cb3738 | 777 | return -ENOMEDIUM; |
83f64091 FB |
778 | if (!drv->bdrv_truncate) |
779 | return -ENOTSUP; | |
59f2689d NS |
780 | if (bs->read_only) |
781 | return -EACCES; | |
83f64091 FB |
782 | return drv->bdrv_truncate(bs, offset); |
783 | } | |
784 | ||
785 | /** | |
786 | * Length of a file in bytes. Return < 0 if error or unknown. | |
787 | */ | |
788 | int64_t bdrv_getlength(BlockDriverState *bs) | |
789 | { | |
790 | BlockDriver *drv = bs->drv; | |
791 | if (!drv) | |
19cb3738 | 792 | return -ENOMEDIUM; |
83f64091 FB |
793 | if (!drv->bdrv_getlength) { |
794 | /* legacy mode */ | |
6ea44308 | 795 | return bs->total_sectors * BDRV_SECTOR_SIZE; |
83f64091 FB |
796 | } |
797 | return drv->bdrv_getlength(bs); | |
fc01f7e7 FB |
798 | } |
799 | ||
19cb3738 | 800 | /* return 0 as number of sectors if no device present or error */ |
96b8f136 | 801 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
fc01f7e7 | 802 | { |
19cb3738 FB |
803 | int64_t length; |
804 | length = bdrv_getlength(bs); | |
805 | if (length < 0) | |
806 | length = 0; | |
807 | else | |
6ea44308 | 808 | length = length >> BDRV_SECTOR_BITS; |
19cb3738 | 809 | *nb_sectors_ptr = length; |
fc01f7e7 | 810 | } |
cf98951b | 811 | |
f3d54fc4 AL |
812 | struct partition { |
813 | uint8_t boot_ind; /* 0x80 - active */ | |
814 | uint8_t head; /* starting head */ | |
815 | uint8_t sector; /* starting sector */ | |
816 | uint8_t cyl; /* starting cylinder */ | |
817 | uint8_t sys_ind; /* What partition type */ | |
818 | uint8_t end_head; /* end head */ | |
819 | uint8_t end_sector; /* end sector */ | |
820 | uint8_t end_cyl; /* end cylinder */ | |
821 | uint32_t start_sect; /* starting sector counting from 0 */ | |
822 | uint32_t nr_sects; /* nr of sectors in partition */ | |
823 | } __attribute__((packed)); | |
824 | ||
825 | /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */ | |
826 | static int guess_disk_lchs(BlockDriverState *bs, | |
827 | int *pcylinders, int *pheads, int *psectors) | |
828 | { | |
829 | uint8_t buf[512]; | |
830 | int ret, i, heads, sectors, cylinders; | |
831 | struct partition *p; | |
832 | uint32_t nr_sects; | |
a38131b6 | 833 | uint64_t nb_sectors; |
f3d54fc4 AL |
834 | |
835 | bdrv_get_geometry(bs, &nb_sectors); | |
836 | ||
837 | ret = bdrv_read(bs, 0, buf, 1); | |
838 | if (ret < 0) | |
839 | return -1; | |
840 | /* test msdos magic */ | |
841 | if (buf[510] != 0x55 || buf[511] != 0xaa) | |
842 | return -1; | |
843 | for(i = 0; i < 4; i++) { | |
844 | p = ((struct partition *)(buf + 0x1be)) + i; | |
845 | nr_sects = le32_to_cpu(p->nr_sects); | |
846 | if (nr_sects && p->end_head) { | |
847 | /* We make the assumption that the partition terminates on | |
848 | a cylinder boundary */ | |
849 | heads = p->end_head + 1; | |
850 | sectors = p->end_sector & 63; | |
851 | if (sectors == 0) | |
852 | continue; | |
853 | cylinders = nb_sectors / (heads * sectors); | |
854 | if (cylinders < 1 || cylinders > 16383) | |
855 | continue; | |
856 | *pheads = heads; | |
857 | *psectors = sectors; | |
858 | *pcylinders = cylinders; | |
859 | #if 0 | |
860 | printf("guessed geometry: LCHS=%d %d %d\n", | |
861 | cylinders, heads, sectors); | |
862 | #endif | |
863 | return 0; | |
864 | } | |
865 | } | |
866 | return -1; | |
867 | } | |
868 | ||
869 | void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) | |
870 | { | |
871 | int translation, lba_detected = 0; | |
872 | int cylinders, heads, secs; | |
a38131b6 | 873 | uint64_t nb_sectors; |
f3d54fc4 AL |
874 | |
875 | /* if a geometry hint is available, use it */ | |
876 | bdrv_get_geometry(bs, &nb_sectors); | |
877 | bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); | |
878 | translation = bdrv_get_translation_hint(bs); | |
879 | if (cylinders != 0) { | |
880 | *pcyls = cylinders; | |
881 | *pheads = heads; | |
882 | *psecs = secs; | |
883 | } else { | |
884 | if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { | |
885 | if (heads > 16) { | |
886 | /* if heads > 16, it means that a BIOS LBA | |
887 | translation was active, so the default | |
888 | hardware geometry is OK */ | |
889 | lba_detected = 1; | |
890 | goto default_geometry; | |
891 | } else { | |
892 | *pcyls = cylinders; | |
893 | *pheads = heads; | |
894 | *psecs = secs; | |
895 | /* disable any translation to be in sync with | |
896 | the logical geometry */ | |
897 | if (translation == BIOS_ATA_TRANSLATION_AUTO) { | |
898 | bdrv_set_translation_hint(bs, | |
899 | BIOS_ATA_TRANSLATION_NONE); | |
900 | } | |
901 | } | |
902 | } else { | |
903 | default_geometry: | |
904 | /* if no geometry, use a standard physical disk geometry */ | |
905 | cylinders = nb_sectors / (16 * 63); | |
906 | ||
907 | if (cylinders > 16383) | |
908 | cylinders = 16383; | |
909 | else if (cylinders < 2) | |
910 | cylinders = 2; | |
911 | *pcyls = cylinders; | |
912 | *pheads = 16; | |
913 | *psecs = 63; | |
914 | if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { | |
915 | if ((*pcyls * *pheads) <= 131072) { | |
916 | bdrv_set_translation_hint(bs, | |
917 | BIOS_ATA_TRANSLATION_LARGE); | |
918 | } else { | |
919 | bdrv_set_translation_hint(bs, | |
920 | BIOS_ATA_TRANSLATION_LBA); | |
921 | } | |
922 | } | |
923 | } | |
924 | bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); | |
925 | } | |
926 | } | |
927 | ||
5fafdf24 | 928 | void bdrv_set_geometry_hint(BlockDriverState *bs, |
b338082b FB |
929 | int cyls, int heads, int secs) |
930 | { | |
931 | bs->cyls = cyls; | |
932 | bs->heads = heads; | |
933 | bs->secs = secs; | |
934 | } | |
935 | ||
936 | void bdrv_set_type_hint(BlockDriverState *bs, int type) | |
937 | { | |
938 | bs->type = type; | |
939 | bs->removable = ((type == BDRV_TYPE_CDROM || | |
940 | type == BDRV_TYPE_FLOPPY)); | |
941 | } | |
942 | ||
46d4767d FB |
943 | void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
944 | { | |
945 | bs->translation = translation; | |
946 | } | |
947 | ||
5fafdf24 | 948 | void bdrv_get_geometry_hint(BlockDriverState *bs, |
b338082b FB |
949 | int *pcyls, int *pheads, int *psecs) |
950 | { | |
951 | *pcyls = bs->cyls; | |
952 | *pheads = bs->heads; | |
953 | *psecs = bs->secs; | |
954 | } | |
955 | ||
956 | int bdrv_get_type_hint(BlockDriverState *bs) | |
957 | { | |
958 | return bs->type; | |
959 | } | |
960 | ||
46d4767d FB |
961 | int bdrv_get_translation_hint(BlockDriverState *bs) |
962 | { | |
963 | return bs->translation; | |
964 | } | |
965 | ||
b338082b FB |
966 | int bdrv_is_removable(BlockDriverState *bs) |
967 | { | |
968 | return bs->removable; | |
969 | } | |
970 | ||
971 | int bdrv_is_read_only(BlockDriverState *bs) | |
972 | { | |
973 | return bs->read_only; | |
974 | } | |
975 | ||
59f2689d NS |
976 | int bdrv_set_read_only(BlockDriverState *bs, int read_only) |
977 | { | |
978 | int ret = bs->read_only; | |
979 | bs->read_only = read_only; | |
980 | return ret; | |
981 | } | |
982 | ||
985a03b0 TS |
983 | int bdrv_is_sg(BlockDriverState *bs) |
984 | { | |
985 | return bs->sg; | |
986 | } | |
987 | ||
e900a7b7 CH |
988 | int bdrv_enable_write_cache(BlockDriverState *bs) |
989 | { | |
990 | return bs->enable_write_cache; | |
991 | } | |
992 | ||
19cb3738 | 993 | /* XXX: no longer used */ |
5fafdf24 | 994 | void bdrv_set_change_cb(BlockDriverState *bs, |
b338082b FB |
995 | void (*change_cb)(void *opaque), void *opaque) |
996 | { | |
997 | bs->change_cb = change_cb; | |
998 | bs->change_opaque = opaque; | |
999 | } | |
1000 | ||
ea2384d3 FB |
1001 | int bdrv_is_encrypted(BlockDriverState *bs) |
1002 | { | |
1003 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
1004 | return 1; | |
1005 | return bs->encrypted; | |
1006 | } | |
1007 | ||
c0f4ce77 AL |
1008 | int bdrv_key_required(BlockDriverState *bs) |
1009 | { | |
1010 | BlockDriverState *backing_hd = bs->backing_hd; | |
1011 | ||
1012 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) | |
1013 | return 1; | |
1014 | return (bs->encrypted && !bs->valid_key); | |
1015 | } | |
1016 | ||
ea2384d3 FB |
1017 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
1018 | { | |
1019 | int ret; | |
1020 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
1021 | ret = bdrv_set_key(bs->backing_hd, key); | |
1022 | if (ret < 0) | |
1023 | return ret; | |
1024 | if (!bs->encrypted) | |
1025 | return 0; | |
1026 | } | |
1027 | if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key) | |
1028 | return -1; | |
c0f4ce77 | 1029 | ret = bs->drv->bdrv_set_key(bs, key); |
bb5fc20f AL |
1030 | if (ret < 0) { |
1031 | bs->valid_key = 0; | |
1032 | } else if (!bs->valid_key) { | |
1033 | bs->valid_key = 1; | |
1034 | /* call the change callback now, we skipped it on open */ | |
1035 | bs->media_changed = 1; | |
1036 | if (bs->change_cb) | |
1037 | bs->change_cb(bs->change_opaque); | |
1038 | } | |
c0f4ce77 | 1039 | return ret; |
ea2384d3 FB |
1040 | } |
1041 | ||
1042 | void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) | |
1043 | { | |
19cb3738 | 1044 | if (!bs->drv) { |
ea2384d3 FB |
1045 | buf[0] = '\0'; |
1046 | } else { | |
1047 | pstrcpy(buf, buf_size, bs->drv->format_name); | |
1048 | } | |
1049 | } | |
1050 | ||
5fafdf24 | 1051 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
ea2384d3 FB |
1052 | void *opaque) |
1053 | { | |
1054 | BlockDriver *drv; | |
1055 | ||
1056 | for (drv = first_drv; drv != NULL; drv = drv->next) { | |
1057 | it(opaque, drv->format_name); | |
1058 | } | |
1059 | } | |
1060 | ||
b338082b FB |
1061 | BlockDriverState *bdrv_find(const char *name) |
1062 | { | |
1063 | BlockDriverState *bs; | |
1064 | ||
1065 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
1066 | if (!strcmp(name, bs->device_name)) | |
1067 | return bs; | |
1068 | } | |
1069 | return NULL; | |
1070 | } | |
1071 | ||
51de9760 | 1072 | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
81d0912d FB |
1073 | { |
1074 | BlockDriverState *bs; | |
1075 | ||
1076 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
51de9760 | 1077 | it(opaque, bs); |
81d0912d FB |
1078 | } |
1079 | } | |
1080 | ||
ea2384d3 FB |
1081 | const char *bdrv_get_device_name(BlockDriverState *bs) |
1082 | { | |
1083 | return bs->device_name; | |
1084 | } | |
1085 | ||
7a6cba61 PB |
1086 | void bdrv_flush(BlockDriverState *bs) |
1087 | { | |
081501da AL |
1088 | if (!bs->drv) |
1089 | return; | |
7a6cba61 PB |
1090 | if (bs->drv->bdrv_flush) |
1091 | bs->drv->bdrv_flush(bs); | |
1092 | if (bs->backing_hd) | |
1093 | bdrv_flush(bs->backing_hd); | |
1094 | } | |
1095 | ||
c6ca28d6 AL |
1096 | void bdrv_flush_all(void) |
1097 | { | |
1098 | BlockDriverState *bs; | |
1099 | ||
1100 | for (bs = bdrv_first; bs != NULL; bs = bs->next) | |
1101 | if (bs->drv && !bdrv_is_read_only(bs) && | |
1102 | (!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) | |
1103 | bdrv_flush(bs); | |
1104 | } | |
1105 | ||
f58c7b35 TS |
1106 | /* |
1107 | * Returns true iff the specified sector is present in the disk image. Drivers | |
1108 | * not implementing the functionality are assumed to not support backing files, | |
1109 | * hence all their sectors are reported as allocated. | |
1110 | * | |
1111 | * 'pnum' is set to the number of sectors (including and immediately following | |
1112 | * the specified sector) that are known to be in the same | |
1113 | * allocated/unallocated state. | |
1114 | * | |
1115 | * 'nb_sectors' is the max value 'pnum' should be set to. | |
1116 | */ | |
1117 | int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, | |
1118 | int *pnum) | |
1119 | { | |
1120 | int64_t n; | |
1121 | if (!bs->drv->bdrv_is_allocated) { | |
1122 | if (sector_num >= bs->total_sectors) { | |
1123 | *pnum = 0; | |
1124 | return 0; | |
1125 | } | |
1126 | n = bs->total_sectors - sector_num; | |
1127 | *pnum = (n < nb_sectors) ? (n) : (nb_sectors); | |
1128 | return 1; | |
1129 | } | |
1130 | return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum); | |
1131 | } | |
1132 | ||
376253ec | 1133 | void bdrv_info(Monitor *mon) |
b338082b FB |
1134 | { |
1135 | BlockDriverState *bs; | |
1136 | ||
1137 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
376253ec AL |
1138 | monitor_printf(mon, "%s:", bs->device_name); |
1139 | monitor_printf(mon, " type="); | |
b338082b FB |
1140 | switch(bs->type) { |
1141 | case BDRV_TYPE_HD: | |
376253ec | 1142 | monitor_printf(mon, "hd"); |
b338082b FB |
1143 | break; |
1144 | case BDRV_TYPE_CDROM: | |
376253ec | 1145 | monitor_printf(mon, "cdrom"); |
b338082b FB |
1146 | break; |
1147 | case BDRV_TYPE_FLOPPY: | |
376253ec | 1148 | monitor_printf(mon, "floppy"); |
b338082b FB |
1149 | break; |
1150 | } | |
376253ec | 1151 | monitor_printf(mon, " removable=%d", bs->removable); |
b338082b | 1152 | if (bs->removable) { |
376253ec | 1153 | monitor_printf(mon, " locked=%d", bs->locked); |
b338082b | 1154 | } |
19cb3738 | 1155 | if (bs->drv) { |
376253ec AL |
1156 | monitor_printf(mon, " file="); |
1157 | monitor_print_filename(mon, bs->filename); | |
fef30743 | 1158 | if (bs->backing_file[0] != '\0') { |
376253ec AL |
1159 | monitor_printf(mon, " backing_file="); |
1160 | monitor_print_filename(mon, bs->backing_file); | |
1161 | } | |
1162 | monitor_printf(mon, " ro=%d", bs->read_only); | |
1163 | monitor_printf(mon, " drv=%s", bs->drv->format_name); | |
1164 | monitor_printf(mon, " encrypted=%d", bdrv_is_encrypted(bs)); | |
b338082b | 1165 | } else { |
376253ec | 1166 | monitor_printf(mon, " [not inserted]"); |
b338082b | 1167 | } |
376253ec | 1168 | monitor_printf(mon, "\n"); |
b338082b FB |
1169 | } |
1170 | } | |
a36e69dd TS |
1171 | |
1172 | /* The "info blockstats" command. */ | |
376253ec | 1173 | void bdrv_info_stats(Monitor *mon) |
a36e69dd TS |
1174 | { |
1175 | BlockDriverState *bs; | |
1176 | ||
1177 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
376253ec AL |
1178 | monitor_printf(mon, "%s:" |
1179 | " rd_bytes=%" PRIu64 | |
1180 | " wr_bytes=%" PRIu64 | |
1181 | " rd_operations=%" PRIu64 | |
1182 | " wr_operations=%" PRIu64 | |
ebf53fcd | 1183 | "\n", |
376253ec AL |
1184 | bs->device_name, |
1185 | bs->rd_bytes, bs->wr_bytes, | |
1186 | bs->rd_ops, bs->wr_ops); | |
a36e69dd TS |
1187 | } |
1188 | } | |
ea2384d3 | 1189 | |
045df330 AL |
1190 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
1191 | { | |
1192 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
1193 | return bs->backing_file; | |
1194 | else if (bs->encrypted) | |
1195 | return bs->filename; | |
1196 | else | |
1197 | return NULL; | |
1198 | } | |
1199 | ||
5fafdf24 | 1200 | void bdrv_get_backing_filename(BlockDriverState *bs, |
83f64091 FB |
1201 | char *filename, int filename_size) |
1202 | { | |
1203 | if (!bs->backing_hd) { | |
1204 | pstrcpy(filename, filename_size, ""); | |
1205 | } else { | |
1206 | pstrcpy(filename, filename_size, bs->backing_file); | |
1207 | } | |
1208 | } | |
1209 | ||
5fafdf24 | 1210 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
faea38e7 FB |
1211 | const uint8_t *buf, int nb_sectors) |
1212 | { | |
1213 | BlockDriver *drv = bs->drv; | |
1214 | if (!drv) | |
19cb3738 | 1215 | return -ENOMEDIUM; |
faea38e7 FB |
1216 | if (!drv->bdrv_write_compressed) |
1217 | return -ENOTSUP; | |
fbb7b4e0 KW |
1218 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
1219 | return -EIO; | |
a55eb92c JK |
1220 | |
1221 | if (bs->dirty_tracking) { | |
7cd1e32a | 1222 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
1223 | } | |
a55eb92c | 1224 | |
faea38e7 FB |
1225 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
1226 | } | |
3b46e624 | 1227 | |
faea38e7 FB |
1228 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
1229 | { | |
1230 | BlockDriver *drv = bs->drv; | |
1231 | if (!drv) | |
19cb3738 | 1232 | return -ENOMEDIUM; |
faea38e7 FB |
1233 | if (!drv->bdrv_get_info) |
1234 | return -ENOTSUP; | |
1235 | memset(bdi, 0, sizeof(*bdi)); | |
1236 | return drv->bdrv_get_info(bs, bdi); | |
1237 | } | |
1238 | ||
45566e9c CH |
1239 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
1240 | int64_t pos, int size) | |
178e08a5 AL |
1241 | { |
1242 | BlockDriver *drv = bs->drv; | |
1243 | if (!drv) | |
1244 | return -ENOMEDIUM; | |
45566e9c | 1245 | if (!drv->bdrv_save_vmstate) |
178e08a5 | 1246 | return -ENOTSUP; |
45566e9c | 1247 | return drv->bdrv_save_vmstate(bs, buf, pos, size); |
178e08a5 AL |
1248 | } |
1249 | ||
45566e9c CH |
1250 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
1251 | int64_t pos, int size) | |
178e08a5 AL |
1252 | { |
1253 | BlockDriver *drv = bs->drv; | |
1254 | if (!drv) | |
1255 | return -ENOMEDIUM; | |
45566e9c | 1256 | if (!drv->bdrv_load_vmstate) |
178e08a5 | 1257 | return -ENOTSUP; |
45566e9c | 1258 | return drv->bdrv_load_vmstate(bs, buf, pos, size); |
178e08a5 AL |
1259 | } |
1260 | ||
faea38e7 FB |
1261 | /**************************************************************/ |
1262 | /* handling of snapshots */ | |
1263 | ||
5fafdf24 | 1264 | int bdrv_snapshot_create(BlockDriverState *bs, |
faea38e7 FB |
1265 | QEMUSnapshotInfo *sn_info) |
1266 | { | |
1267 | BlockDriver *drv = bs->drv; | |
1268 | if (!drv) | |
19cb3738 | 1269 | return -ENOMEDIUM; |
faea38e7 FB |
1270 | if (!drv->bdrv_snapshot_create) |
1271 | return -ENOTSUP; | |
1272 | return drv->bdrv_snapshot_create(bs, sn_info); | |
1273 | } | |
1274 | ||
5fafdf24 | 1275 | int bdrv_snapshot_goto(BlockDriverState *bs, |
faea38e7 FB |
1276 | const char *snapshot_id) |
1277 | { | |
1278 | BlockDriver *drv = bs->drv; | |
1279 | if (!drv) | |
19cb3738 | 1280 | return -ENOMEDIUM; |
faea38e7 FB |
1281 | if (!drv->bdrv_snapshot_goto) |
1282 | return -ENOTSUP; | |
1283 | return drv->bdrv_snapshot_goto(bs, snapshot_id); | |
1284 | } | |
1285 | ||
1286 | int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) | |
1287 | { | |
1288 | BlockDriver *drv = bs->drv; | |
1289 | if (!drv) | |
19cb3738 | 1290 | return -ENOMEDIUM; |
faea38e7 FB |
1291 | if (!drv->bdrv_snapshot_delete) |
1292 | return -ENOTSUP; | |
1293 | return drv->bdrv_snapshot_delete(bs, snapshot_id); | |
1294 | } | |
1295 | ||
5fafdf24 | 1296 | int bdrv_snapshot_list(BlockDriverState *bs, |
faea38e7 FB |
1297 | QEMUSnapshotInfo **psn_info) |
1298 | { | |
1299 | BlockDriver *drv = bs->drv; | |
1300 | if (!drv) | |
19cb3738 | 1301 | return -ENOMEDIUM; |
faea38e7 FB |
1302 | if (!drv->bdrv_snapshot_list) |
1303 | return -ENOTSUP; | |
1304 | return drv->bdrv_snapshot_list(bs, psn_info); | |
1305 | } | |
1306 | ||
1307 | #define NB_SUFFIXES 4 | |
1308 | ||
1309 | char *get_human_readable_size(char *buf, int buf_size, int64_t size) | |
1310 | { | |
1311 | static const char suffixes[NB_SUFFIXES] = "KMGT"; | |
1312 | int64_t base; | |
1313 | int i; | |
1314 | ||
1315 | if (size <= 999) { | |
1316 | snprintf(buf, buf_size, "%" PRId64, size); | |
1317 | } else { | |
1318 | base = 1024; | |
1319 | for(i = 0; i < NB_SUFFIXES; i++) { | |
1320 | if (size < (10 * base)) { | |
5fafdf24 | 1321 | snprintf(buf, buf_size, "%0.1f%c", |
faea38e7 FB |
1322 | (double)size / base, |
1323 | suffixes[i]); | |
1324 | break; | |
1325 | } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { | |
5fafdf24 | 1326 | snprintf(buf, buf_size, "%" PRId64 "%c", |
faea38e7 FB |
1327 | ((size + (base >> 1)) / base), |
1328 | suffixes[i]); | |
1329 | break; | |
1330 | } | |
1331 | base = base * 1024; | |
1332 | } | |
1333 | } | |
1334 | return buf; | |
1335 | } | |
1336 | ||
1337 | char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) | |
1338 | { | |
1339 | char buf1[128], date_buf[128], clock_buf[128]; | |
3b9f94e1 FB |
1340 | #ifdef _WIN32 |
1341 | struct tm *ptm; | |
1342 | #else | |
faea38e7 | 1343 | struct tm tm; |
3b9f94e1 | 1344 | #endif |
faea38e7 FB |
1345 | time_t ti; |
1346 | int64_t secs; | |
1347 | ||
1348 | if (!sn) { | |
5fafdf24 TS |
1349 | snprintf(buf, buf_size, |
1350 | "%-10s%-20s%7s%20s%15s", | |
faea38e7 FB |
1351 | "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
1352 | } else { | |
1353 | ti = sn->date_sec; | |
3b9f94e1 FB |
1354 | #ifdef _WIN32 |
1355 | ptm = localtime(&ti); | |
1356 | strftime(date_buf, sizeof(date_buf), | |
1357 | "%Y-%m-%d %H:%M:%S", ptm); | |
1358 | #else | |
faea38e7 FB |
1359 | localtime_r(&ti, &tm); |
1360 | strftime(date_buf, sizeof(date_buf), | |
1361 | "%Y-%m-%d %H:%M:%S", &tm); | |
3b9f94e1 | 1362 | #endif |
faea38e7 FB |
1363 | secs = sn->vm_clock_nsec / 1000000000; |
1364 | snprintf(clock_buf, sizeof(clock_buf), | |
1365 | "%02d:%02d:%02d.%03d", | |
1366 | (int)(secs / 3600), | |
1367 | (int)((secs / 60) % 60), | |
5fafdf24 | 1368 | (int)(secs % 60), |
faea38e7 FB |
1369 | (int)((sn->vm_clock_nsec / 1000000) % 1000)); |
1370 | snprintf(buf, buf_size, | |
5fafdf24 | 1371 | "%-10s%-20s%7s%20s%15s", |
faea38e7 FB |
1372 | sn->id_str, sn->name, |
1373 | get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), | |
1374 | date_buf, | |
1375 | clock_buf); | |
1376 | } | |
1377 | return buf; | |
1378 | } | |
1379 | ||
83f64091 | 1380 | |
ea2384d3 | 1381 | /**************************************************************/ |
83f64091 | 1382 | /* async I/Os */ |
ea2384d3 | 1383 | |
3b69e4b9 | 1384 | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
f141eafe | 1385 | QEMUIOVector *qiov, int nb_sectors, |
3b69e4b9 | 1386 | BlockDriverCompletionFunc *cb, void *opaque) |
83f64091 FB |
1387 | { |
1388 | BlockDriver *drv = bs->drv; | |
a36e69dd | 1389 | BlockDriverAIOCB *ret; |
83f64091 | 1390 | |
19cb3738 | 1391 | if (!drv) |
ce1a14dc | 1392 | return NULL; |
71d0770c AL |
1393 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
1394 | return NULL; | |
3b46e624 | 1395 | |
f141eafe AL |
1396 | ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors, |
1397 | cb, opaque); | |
a36e69dd TS |
1398 | |
1399 | if (ret) { | |
1400 | /* Update stats even though technically transfer has not happened. */ | |
6ea44308 | 1401 | bs->rd_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE; |
a36e69dd TS |
1402 | bs->rd_ops ++; |
1403 | } | |
1404 | ||
1405 | return ret; | |
ea2384d3 FB |
1406 | } |
1407 | ||
f141eafe AL |
1408 | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
1409 | QEMUIOVector *qiov, int nb_sectors, | |
1410 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 1411 | { |
83f64091 | 1412 | BlockDriver *drv = bs->drv; |
a36e69dd | 1413 | BlockDriverAIOCB *ret; |
ea2384d3 | 1414 | |
19cb3738 | 1415 | if (!drv) |
ce1a14dc | 1416 | return NULL; |
83f64091 | 1417 | if (bs->read_only) |
ce1a14dc | 1418 | return NULL; |
71d0770c AL |
1419 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
1420 | return NULL; | |
83f64091 | 1421 | |
a55eb92c | 1422 | if (bs->dirty_tracking) { |
7cd1e32a | 1423 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
1424 | } | |
a55eb92c | 1425 | |
f141eafe AL |
1426 | ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors, |
1427 | cb, opaque); | |
a36e69dd TS |
1428 | |
1429 | if (ret) { | |
1430 | /* Update stats even though technically transfer has not happened. */ | |
6ea44308 | 1431 | bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE; |
a36e69dd TS |
1432 | bs->wr_ops ++; |
1433 | } | |
1434 | ||
1435 | return ret; | |
83f64091 FB |
1436 | } |
1437 | ||
40b4f539 KW |
1438 | |
1439 | typedef struct MultiwriteCB { | |
1440 | int error; | |
1441 | int num_requests; | |
1442 | int num_callbacks; | |
1443 | struct { | |
1444 | BlockDriverCompletionFunc *cb; | |
1445 | void *opaque; | |
1446 | QEMUIOVector *free_qiov; | |
1447 | void *free_buf; | |
1448 | } callbacks[]; | |
1449 | } MultiwriteCB; | |
1450 | ||
1451 | static void multiwrite_user_cb(MultiwriteCB *mcb) | |
1452 | { | |
1453 | int i; | |
1454 | ||
1455 | for (i = 0; i < mcb->num_callbacks; i++) { | |
1456 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); | |
1457 | qemu_free(mcb->callbacks[i].free_qiov); | |
1458 | qemu_free(mcb->callbacks[i].free_buf); | |
1459 | } | |
1460 | } | |
1461 | ||
1462 | static void multiwrite_cb(void *opaque, int ret) | |
1463 | { | |
1464 | MultiwriteCB *mcb = opaque; | |
1465 | ||
1466 | if (ret < 0) { | |
1467 | mcb->error = ret; | |
1468 | multiwrite_user_cb(mcb); | |
1469 | } | |
1470 | ||
1471 | mcb->num_requests--; | |
1472 | if (mcb->num_requests == 0) { | |
1473 | if (mcb->error == 0) { | |
1474 | multiwrite_user_cb(mcb); | |
1475 | } | |
1476 | qemu_free(mcb); | |
1477 | } | |
1478 | } | |
1479 | ||
1480 | static int multiwrite_req_compare(const void *a, const void *b) | |
1481 | { | |
1482 | return (((BlockRequest*) a)->sector - ((BlockRequest*) b)->sector); | |
1483 | } | |
1484 | ||
1485 | /* | |
1486 | * Takes a bunch of requests and tries to merge them. Returns the number of | |
1487 | * requests that remain after merging. | |
1488 | */ | |
1489 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, | |
1490 | int num_reqs, MultiwriteCB *mcb) | |
1491 | { | |
1492 | int i, outidx; | |
1493 | ||
1494 | // Sort requests by start sector | |
1495 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); | |
1496 | ||
1497 | // Check if adjacent requests touch the same clusters. If so, combine them, | |
1498 | // filling up gaps with zero sectors. | |
1499 | outidx = 0; | |
1500 | for (i = 1; i < num_reqs; i++) { | |
1501 | int merge = 0; | |
1502 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; | |
1503 | ||
1504 | // This handles the cases that are valid for all block drivers, namely | |
1505 | // exactly sequential writes and overlapping writes. | |
1506 | if (reqs[i].sector <= oldreq_last) { | |
1507 | merge = 1; | |
1508 | } | |
1509 | ||
1510 | // The block driver may decide that it makes sense to combine requests | |
1511 | // even if there is a gap of some sectors between them. In this case, | |
1512 | // the gap is filled with zeros (therefore only applicable for yet | |
1513 | // unused space in format like qcow2). | |
1514 | if (!merge && bs->drv->bdrv_merge_requests) { | |
1515 | merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]); | |
1516 | } | |
1517 | ||
1518 | if (merge) { | |
1519 | size_t size; | |
1520 | QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov)); | |
1521 | qemu_iovec_init(qiov, | |
1522 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); | |
1523 | ||
1524 | // Add the first request to the merged one. If the requests are | |
1525 | // overlapping, drop the last sectors of the first request. | |
1526 | size = (reqs[i].sector - reqs[outidx].sector) << 9; | |
1527 | qemu_iovec_concat(qiov, reqs[outidx].qiov, size); | |
1528 | ||
1529 | // We might need to add some zeros between the two requests | |
1530 | if (reqs[i].sector > oldreq_last) { | |
1531 | size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9; | |
1532 | uint8_t *buf = qemu_blockalign(bs, zero_bytes); | |
1533 | memset(buf, 0, zero_bytes); | |
1534 | qemu_iovec_add(qiov, buf, zero_bytes); | |
1535 | mcb->callbacks[i].free_buf = buf; | |
1536 | } | |
1537 | ||
1538 | // Add the second request | |
1539 | qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size); | |
1540 | ||
1541 | reqs[outidx].nb_sectors += reqs[i].nb_sectors; | |
1542 | reqs[outidx].qiov = qiov; | |
1543 | ||
1544 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; | |
1545 | } else { | |
1546 | outidx++; | |
1547 | reqs[outidx].sector = reqs[i].sector; | |
1548 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; | |
1549 | reqs[outidx].qiov = reqs[i].qiov; | |
1550 | } | |
1551 | } | |
1552 | ||
1553 | return outidx + 1; | |
1554 | } | |
1555 | ||
1556 | /* | |
1557 | * Submit multiple AIO write requests at once. | |
1558 | * | |
1559 | * On success, the function returns 0 and all requests in the reqs array have | |
1560 | * been submitted. In error case this function returns -1, and any of the | |
1561 | * requests may or may not be submitted yet. In particular, this means that the | |
1562 | * callback will be called for some of the requests, for others it won't. The | |
1563 | * caller must check the error field of the BlockRequest to wait for the right | |
1564 | * callbacks (if error != 0, no callback will be called). | |
1565 | * | |
1566 | * The implementation may modify the contents of the reqs array, e.g. to merge | |
1567 | * requests. However, the fields opaque and error are left unmodified as they | |
1568 | * are used to signal failure for a single request to the caller. | |
1569 | */ | |
1570 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) | |
1571 | { | |
1572 | BlockDriverAIOCB *acb; | |
1573 | MultiwriteCB *mcb; | |
1574 | int i; | |
1575 | ||
1576 | if (num_reqs == 0) { | |
1577 | return 0; | |
1578 | } | |
1579 | ||
1580 | // Create MultiwriteCB structure | |
1581 | mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); | |
1582 | mcb->num_requests = 0; | |
1583 | mcb->num_callbacks = num_reqs; | |
1584 | ||
1585 | for (i = 0; i < num_reqs; i++) { | |
1586 | mcb->callbacks[i].cb = reqs[i].cb; | |
1587 | mcb->callbacks[i].opaque = reqs[i].opaque; | |
1588 | } | |
1589 | ||
1590 | // Check for mergable requests | |
1591 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); | |
1592 | ||
1593 | // Run the aio requests | |
1594 | for (i = 0; i < num_reqs; i++) { | |
1595 | acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, | |
1596 | reqs[i].nb_sectors, multiwrite_cb, mcb); | |
1597 | ||
1598 | if (acb == NULL) { | |
1599 | // We can only fail the whole thing if no request has been | |
1600 | // submitted yet. Otherwise we'll wait for the submitted AIOs to | |
1601 | // complete and report the error in the callback. | |
1602 | if (mcb->num_requests == 0) { | |
1603 | reqs[i].error = EIO; | |
1604 | goto fail; | |
1605 | } else { | |
1606 | mcb->error = EIO; | |
1607 | break; | |
1608 | } | |
1609 | } else { | |
1610 | mcb->num_requests++; | |
1611 | } | |
1612 | } | |
1613 | ||
1614 | return 0; | |
1615 | ||
1616 | fail: | |
1617 | free(mcb); | |
1618 | return -1; | |
1619 | } | |
1620 | ||
b2e12bc6 CH |
1621 | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
1622 | BlockDriverCompletionFunc *cb, void *opaque) | |
1623 | { | |
1624 | BlockDriver *drv = bs->drv; | |
1625 | ||
1626 | if (!drv) | |
1627 | return NULL; | |
1628 | ||
1629 | /* | |
1630 | * Note that unlike bdrv_flush the driver is reponsible for flushing a | |
1631 | * backing image if it exists. | |
1632 | */ | |
1633 | return drv->bdrv_aio_flush(bs, cb, opaque); | |
1634 | } | |
1635 | ||
83f64091 | 1636 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
83f64091 | 1637 | { |
6bbff9a0 | 1638 | acb->pool->cancel(acb); |
83f64091 FB |
1639 | } |
1640 | ||
ce1a14dc | 1641 | |
83f64091 FB |
1642 | /**************************************************************/ |
1643 | /* async block device emulation */ | |
1644 | ||
c16b5a2c CH |
1645 | typedef struct BlockDriverAIOCBSync { |
1646 | BlockDriverAIOCB common; | |
1647 | QEMUBH *bh; | |
1648 | int ret; | |
1649 | /* vector translation state */ | |
1650 | QEMUIOVector *qiov; | |
1651 | uint8_t *bounce; | |
1652 | int is_write; | |
1653 | } BlockDriverAIOCBSync; | |
1654 | ||
1655 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) | |
1656 | { | |
1657 | BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb; | |
6a7ad299 | 1658 | qemu_bh_delete(acb->bh); |
36afc451 | 1659 | acb->bh = NULL; |
c16b5a2c CH |
1660 | qemu_aio_release(acb); |
1661 | } | |
1662 | ||
1663 | static AIOPool bdrv_em_aio_pool = { | |
1664 | .aiocb_size = sizeof(BlockDriverAIOCBSync), | |
1665 | .cancel = bdrv_aio_cancel_em, | |
1666 | }; | |
1667 | ||
ce1a14dc | 1668 | static void bdrv_aio_bh_cb(void *opaque) |
83f64091 | 1669 | { |
ce1a14dc | 1670 | BlockDriverAIOCBSync *acb = opaque; |
f141eafe | 1671 | |
f141eafe AL |
1672 | if (!acb->is_write) |
1673 | qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); | |
ceb42de8 | 1674 | qemu_vfree(acb->bounce); |
ce1a14dc | 1675 | acb->common.cb(acb->common.opaque, acb->ret); |
6a7ad299 | 1676 | qemu_bh_delete(acb->bh); |
36afc451 | 1677 | acb->bh = NULL; |
ce1a14dc | 1678 | qemu_aio_release(acb); |
83f64091 | 1679 | } |
beac80cd | 1680 | |
f141eafe AL |
1681 | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
1682 | int64_t sector_num, | |
1683 | QEMUIOVector *qiov, | |
1684 | int nb_sectors, | |
1685 | BlockDriverCompletionFunc *cb, | |
1686 | void *opaque, | |
1687 | int is_write) | |
1688 | ||
83f64091 | 1689 | { |
ce1a14dc | 1690 | BlockDriverAIOCBSync *acb; |
ce1a14dc | 1691 | |
c16b5a2c | 1692 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
f141eafe AL |
1693 | acb->is_write = is_write; |
1694 | acb->qiov = qiov; | |
e268ca52 | 1695 | acb->bounce = qemu_blockalign(bs, qiov->size); |
f141eafe | 1696 | |
ce1a14dc PB |
1697 | if (!acb->bh) |
1698 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
f141eafe AL |
1699 | |
1700 | if (is_write) { | |
1701 | qemu_iovec_to_buffer(acb->qiov, acb->bounce); | |
1702 | acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors); | |
1703 | } else { | |
1704 | acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors); | |
1705 | } | |
1706 | ||
ce1a14dc | 1707 | qemu_bh_schedule(acb->bh); |
f141eafe | 1708 | |
ce1a14dc | 1709 | return &acb->common; |
beac80cd FB |
1710 | } |
1711 | ||
f141eafe AL |
1712 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
1713 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 1714 | BlockDriverCompletionFunc *cb, void *opaque) |
beac80cd | 1715 | { |
f141eafe AL |
1716 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
1717 | } | |
83f64091 | 1718 | |
f141eafe AL |
1719 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
1720 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
1721 | BlockDriverCompletionFunc *cb, void *opaque) | |
1722 | { | |
1723 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); | |
beac80cd | 1724 | } |
beac80cd | 1725 | |
b2e12bc6 CH |
1726 | static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, |
1727 | BlockDriverCompletionFunc *cb, void *opaque) | |
1728 | { | |
1729 | BlockDriverAIOCBSync *acb; | |
1730 | ||
1731 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); | |
1732 | acb->is_write = 1; /* don't bounce in the completion hadler */ | |
1733 | acb->qiov = NULL; | |
1734 | acb->bounce = NULL; | |
1735 | acb->ret = 0; | |
1736 | ||
1737 | if (!acb->bh) | |
1738 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
1739 | ||
1740 | bdrv_flush(bs); | |
1741 | qemu_bh_schedule(acb->bh); | |
1742 | return &acb->common; | |
1743 | } | |
1744 | ||
83f64091 FB |
1745 | /**************************************************************/ |
1746 | /* sync block device emulation */ | |
ea2384d3 | 1747 | |
83f64091 FB |
1748 | static void bdrv_rw_em_cb(void *opaque, int ret) |
1749 | { | |
1750 | *(int *)opaque = ret; | |
ea2384d3 FB |
1751 | } |
1752 | ||
83f64091 FB |
1753 | #define NOT_DONE 0x7fffffff |
1754 | ||
5fafdf24 | 1755 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
83f64091 | 1756 | uint8_t *buf, int nb_sectors) |
7a6cba61 | 1757 | { |
ce1a14dc PB |
1758 | int async_ret; |
1759 | BlockDriverAIOCB *acb; | |
f141eafe AL |
1760 | struct iovec iov; |
1761 | QEMUIOVector qiov; | |
83f64091 | 1762 | |
65d6b3d8 KW |
1763 | async_context_push(); |
1764 | ||
83f64091 | 1765 | async_ret = NOT_DONE; |
3f4cb3d3 | 1766 | iov.iov_base = (void *)buf; |
f141eafe AL |
1767 | iov.iov_len = nb_sectors * 512; |
1768 | qemu_iovec_init_external(&qiov, &iov, 1); | |
1769 | acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors, | |
1770 | bdrv_rw_em_cb, &async_ret); | |
65d6b3d8 KW |
1771 | if (acb == NULL) { |
1772 | async_ret = -1; | |
1773 | goto fail; | |
1774 | } | |
baf35cb9 | 1775 | |
83f64091 FB |
1776 | while (async_ret == NOT_DONE) { |
1777 | qemu_aio_wait(); | |
1778 | } | |
baf35cb9 | 1779 | |
65d6b3d8 KW |
1780 | |
1781 | fail: | |
1782 | async_context_pop(); | |
83f64091 | 1783 | return async_ret; |
7a6cba61 PB |
1784 | } |
1785 | ||
83f64091 FB |
1786 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
1787 | const uint8_t *buf, int nb_sectors) | |
1788 | { | |
ce1a14dc PB |
1789 | int async_ret; |
1790 | BlockDriverAIOCB *acb; | |
f141eafe AL |
1791 | struct iovec iov; |
1792 | QEMUIOVector qiov; | |
83f64091 | 1793 | |
65d6b3d8 KW |
1794 | async_context_push(); |
1795 | ||
83f64091 | 1796 | async_ret = NOT_DONE; |
f141eafe AL |
1797 | iov.iov_base = (void *)buf; |
1798 | iov.iov_len = nb_sectors * 512; | |
1799 | qemu_iovec_init_external(&qiov, &iov, 1); | |
1800 | acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors, | |
1801 | bdrv_rw_em_cb, &async_ret); | |
65d6b3d8 KW |
1802 | if (acb == NULL) { |
1803 | async_ret = -1; | |
1804 | goto fail; | |
1805 | } | |
83f64091 FB |
1806 | while (async_ret == NOT_DONE) { |
1807 | qemu_aio_wait(); | |
1808 | } | |
65d6b3d8 KW |
1809 | |
1810 | fail: | |
1811 | async_context_pop(); | |
83f64091 FB |
1812 | return async_ret; |
1813 | } | |
ea2384d3 FB |
1814 | |
1815 | void bdrv_init(void) | |
1816 | { | |
5efa9d5a | 1817 | module_call_init(MODULE_INIT_BLOCK); |
ea2384d3 | 1818 | } |
ce1a14dc | 1819 | |
eb852011 MA |
1820 | void bdrv_init_with_whitelist(void) |
1821 | { | |
1822 | use_bdrv_whitelist = 1; | |
1823 | bdrv_init(); | |
1824 | } | |
1825 | ||
c16b5a2c CH |
1826 | void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs, |
1827 | BlockDriverCompletionFunc *cb, void *opaque) | |
ce1a14dc | 1828 | { |
ce1a14dc PB |
1829 | BlockDriverAIOCB *acb; |
1830 | ||
6bbff9a0 AL |
1831 | if (pool->free_aiocb) { |
1832 | acb = pool->free_aiocb; | |
1833 | pool->free_aiocb = acb->next; | |
ce1a14dc | 1834 | } else { |
6bbff9a0 AL |
1835 | acb = qemu_mallocz(pool->aiocb_size); |
1836 | acb->pool = pool; | |
ce1a14dc PB |
1837 | } |
1838 | acb->bs = bs; | |
1839 | acb->cb = cb; | |
1840 | acb->opaque = opaque; | |
1841 | return acb; | |
1842 | } | |
1843 | ||
1844 | void qemu_aio_release(void *p) | |
1845 | { | |
6bbff9a0 AL |
1846 | BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; |
1847 | AIOPool *pool = acb->pool; | |
1848 | acb->next = pool->free_aiocb; | |
1849 | pool->free_aiocb = acb; | |
ce1a14dc | 1850 | } |
19cb3738 FB |
1851 | |
1852 | /**************************************************************/ | |
1853 | /* removable device support */ | |
1854 | ||
1855 | /** | |
1856 | * Return TRUE if the media is present | |
1857 | */ | |
1858 | int bdrv_is_inserted(BlockDriverState *bs) | |
1859 | { | |
1860 | BlockDriver *drv = bs->drv; | |
1861 | int ret; | |
1862 | if (!drv) | |
1863 | return 0; | |
1864 | if (!drv->bdrv_is_inserted) | |
1865 | return 1; | |
1866 | ret = drv->bdrv_is_inserted(bs); | |
1867 | return ret; | |
1868 | } | |
1869 | ||
1870 | /** | |
1871 | * Return TRUE if the media changed since the last call to this | |
5fafdf24 | 1872 | * function. It is currently only used for floppy disks |
19cb3738 FB |
1873 | */ |
1874 | int bdrv_media_changed(BlockDriverState *bs) | |
1875 | { | |
1876 | BlockDriver *drv = bs->drv; | |
1877 | int ret; | |
1878 | ||
1879 | if (!drv || !drv->bdrv_media_changed) | |
1880 | ret = -ENOTSUP; | |
1881 | else | |
1882 | ret = drv->bdrv_media_changed(bs); | |
1883 | if (ret == -ENOTSUP) | |
1884 | ret = bs->media_changed; | |
1885 | bs->media_changed = 0; | |
1886 | return ret; | |
1887 | } | |
1888 | ||
1889 | /** | |
1890 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
1891 | */ | |
aea2a33c | 1892 | int bdrv_eject(BlockDriverState *bs, int eject_flag) |
19cb3738 FB |
1893 | { |
1894 | BlockDriver *drv = bs->drv; | |
1895 | int ret; | |
1896 | ||
aea2a33c MM |
1897 | if (bs->locked) { |
1898 | return -EBUSY; | |
1899 | } | |
1900 | ||
19cb3738 FB |
1901 | if (!drv || !drv->bdrv_eject) { |
1902 | ret = -ENOTSUP; | |
1903 | } else { | |
1904 | ret = drv->bdrv_eject(bs, eject_flag); | |
1905 | } | |
1906 | if (ret == -ENOTSUP) { | |
1907 | if (eject_flag) | |
1908 | bdrv_close(bs); | |
aea2a33c | 1909 | ret = 0; |
19cb3738 | 1910 | } |
aea2a33c MM |
1911 | |
1912 | return ret; | |
19cb3738 FB |
1913 | } |
1914 | ||
1915 | int bdrv_is_locked(BlockDriverState *bs) | |
1916 | { | |
1917 | return bs->locked; | |
1918 | } | |
1919 | ||
1920 | /** | |
1921 | * Lock or unlock the media (if it is locked, the user won't be able | |
1922 | * to eject it manually). | |
1923 | */ | |
1924 | void bdrv_set_locked(BlockDriverState *bs, int locked) | |
1925 | { | |
1926 | BlockDriver *drv = bs->drv; | |
1927 | ||
1928 | bs->locked = locked; | |
1929 | if (drv && drv->bdrv_set_locked) { | |
1930 | drv->bdrv_set_locked(bs, locked); | |
1931 | } | |
1932 | } | |
985a03b0 TS |
1933 | |
1934 | /* needed for generic scsi interface */ | |
1935 | ||
1936 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
1937 | { | |
1938 | BlockDriver *drv = bs->drv; | |
1939 | ||
1940 | if (drv && drv->bdrv_ioctl) | |
1941 | return drv->bdrv_ioctl(bs, req, buf); | |
1942 | return -ENOTSUP; | |
1943 | } | |
7d780669 | 1944 | |
221f715d AL |
1945 | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
1946 | unsigned long int req, void *buf, | |
1947 | BlockDriverCompletionFunc *cb, void *opaque) | |
7d780669 | 1948 | { |
221f715d | 1949 | BlockDriver *drv = bs->drv; |
7d780669 | 1950 | |
221f715d AL |
1951 | if (drv && drv->bdrv_aio_ioctl) |
1952 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); | |
1953 | return NULL; | |
7d780669 | 1954 | } |
e268ca52 | 1955 | |
7cd1e32a | 1956 | |
1957 | ||
e268ca52 AL |
1958 | void *qemu_blockalign(BlockDriverState *bs, size_t size) |
1959 | { | |
1960 | return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); | |
1961 | } | |
7cd1e32a | 1962 | |
1963 | void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable) | |
1964 | { | |
1965 | int64_t bitmap_size; | |
a55eb92c JK |
1966 | |
1967 | if (enable) { | |
1968 | if (bs->dirty_tracking == 0) { | |
7cd1e32a | 1969 | int64_t i; |
1970 | uint8_t test; | |
a55eb92c | 1971 | |
6ea44308 JK |
1972 | bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS); |
1973 | bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK; | |
7cd1e32a | 1974 | bitmap_size++; |
a55eb92c | 1975 | |
7cd1e32a | 1976 | bs->dirty_bitmap = qemu_mallocz(bitmap_size); |
a55eb92c | 1977 | |
7cd1e32a | 1978 | bs->dirty_tracking = enable; |
1979 | for(i = 0; i < bitmap_size; i++) test = bs->dirty_bitmap[i]; | |
a55eb92c | 1980 | } |
7cd1e32a | 1981 | } else { |
a55eb92c | 1982 | if (bs->dirty_tracking != 0) { |
7cd1e32a | 1983 | qemu_free(bs->dirty_bitmap); |
1984 | bs->dirty_tracking = enable; | |
a55eb92c | 1985 | } |
7cd1e32a | 1986 | } |
1987 | } | |
1988 | ||
1989 | int bdrv_get_dirty(BlockDriverState *bs, int64_t sector) | |
1990 | { | |
6ea44308 | 1991 | int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; |
a55eb92c JK |
1992 | |
1993 | if (bs->dirty_bitmap != NULL && | |
6ea44308 | 1994 | (sector << BDRV_SECTOR_BITS) <= bdrv_getlength(bs)) { |
7cd1e32a | 1995 | return bs->dirty_bitmap[chunk]; |
1996 | } else { | |
1997 | return 0; | |
1998 | } | |
1999 | } | |
2000 | ||
a55eb92c JK |
2001 | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, |
2002 | int nr_sectors) | |
7cd1e32a | 2003 | { |
2004 | set_dirty_bitmap(bs, cur_sector, nr_sectors, 0); | |
2005 | } |