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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 | ||
83f64091 FB |
44 | #define SECTOR_BITS 9 |
45 | #define SECTOR_SIZE (1 << SECTOR_BITS) | |
7cd1e32a | 46 | #define SECTORS_PER_DIRTY_CHUNK 8 |
83f64091 | 47 | |
f141eafe AL |
48 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
49 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
c87c0672 | 50 | BlockDriverCompletionFunc *cb, void *opaque); |
f141eafe AL |
51 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
52 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 53 | BlockDriverCompletionFunc *cb, void *opaque); |
b2e12bc6 CH |
54 | static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, |
55 | BlockDriverCompletionFunc *cb, void *opaque); | |
5fafdf24 | 56 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
83f64091 FB |
57 | uint8_t *buf, int nb_sectors); |
58 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, | |
59 | const uint8_t *buf, int nb_sectors); | |
ec530c81 | 60 | |
7ee930d0 BS |
61 | BlockDriverState *bdrv_first; |
62 | ||
ea2384d3 FB |
63 | static BlockDriver *first_drv; |
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 | ||
ea2384d3 FB |
147 | bdrv->next = first_drv; |
148 | first_drv = bdrv; | |
149 | } | |
b338082b FB |
150 | |
151 | /* create a new block device (by default it is empty) */ | |
152 | BlockDriverState *bdrv_new(const char *device_name) | |
153 | { | |
154 | BlockDriverState **pbs, *bs; | |
155 | ||
156 | bs = qemu_mallocz(sizeof(BlockDriverState)); | |
b338082b | 157 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); |
ea2384d3 FB |
158 | if (device_name[0] != '\0') { |
159 | /* insert at the end */ | |
160 | pbs = &bdrv_first; | |
161 | while (*pbs != NULL) | |
162 | pbs = &(*pbs)->next; | |
163 | *pbs = bs; | |
164 | } | |
b338082b FB |
165 | return bs; |
166 | } | |
167 | ||
ea2384d3 FB |
168 | BlockDriver *bdrv_find_format(const char *format_name) |
169 | { | |
170 | BlockDriver *drv1; | |
171 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { | |
172 | if (!strcmp(drv1->format_name, format_name)) | |
173 | return drv1; | |
174 | } | |
175 | return NULL; | |
176 | } | |
177 | ||
eb852011 MA |
178 | static int bdrv_is_whitelisted(BlockDriver *drv) |
179 | { | |
180 | static const char *whitelist[] = { | |
181 | CONFIG_BDRV_WHITELIST | |
182 | }; | |
183 | const char **p; | |
184 | ||
185 | if (!whitelist[0]) | |
186 | return 1; /* no whitelist, anything goes */ | |
187 | ||
188 | for (p = whitelist; *p; p++) { | |
189 | if (!strcmp(drv->format_name, *p)) { | |
190 | return 1; | |
191 | } | |
192 | } | |
193 | return 0; | |
194 | } | |
195 | ||
196 | BlockDriver *bdrv_find_whitelisted_format(const char *format_name) | |
197 | { | |
198 | BlockDriver *drv = bdrv_find_format(format_name); | |
199 | return drv && bdrv_is_whitelisted(drv) ? drv : NULL; | |
200 | } | |
201 | ||
0e7e1989 KW |
202 | int bdrv_create(BlockDriver *drv, const char* filename, |
203 | QEMUOptionParameter *options) | |
ea2384d3 FB |
204 | { |
205 | if (!drv->bdrv_create) | |
206 | return -ENOTSUP; | |
0e7e1989 KW |
207 | |
208 | return drv->bdrv_create(filename, options); | |
ea2384d3 FB |
209 | } |
210 | ||
d5249393 | 211 | #ifdef _WIN32 |
95389c86 | 212 | void get_tmp_filename(char *filename, int size) |
d5249393 | 213 | { |
3b9f94e1 | 214 | char temp_dir[MAX_PATH]; |
3b46e624 | 215 | |
3b9f94e1 FB |
216 | GetTempPath(MAX_PATH, temp_dir); |
217 | GetTempFileName(temp_dir, "qem", 0, filename); | |
d5249393 FB |
218 | } |
219 | #else | |
95389c86 | 220 | void get_tmp_filename(char *filename, int size) |
fc01f7e7 | 221 | { |
67b915a5 | 222 | int fd; |
7ccfb2eb | 223 | const char *tmpdir; |
d5249393 | 224 | /* XXX: race condition possible */ |
0badc1ee AJ |
225 | tmpdir = getenv("TMPDIR"); |
226 | if (!tmpdir) | |
227 | tmpdir = "/tmp"; | |
228 | snprintf(filename, size, "%s/vl.XXXXXX", tmpdir); | |
ea2384d3 FB |
229 | fd = mkstemp(filename); |
230 | close(fd); | |
231 | } | |
d5249393 | 232 | #endif |
fc01f7e7 | 233 | |
19cb3738 | 234 | #ifdef _WIN32 |
f45512fe FB |
235 | static int is_windows_drive_prefix(const char *filename) |
236 | { | |
237 | return (((filename[0] >= 'a' && filename[0] <= 'z') || | |
238 | (filename[0] >= 'A' && filename[0] <= 'Z')) && | |
239 | filename[1] == ':'); | |
240 | } | |
3b46e624 | 241 | |
508c7cb3 | 242 | int is_windows_drive(const char *filename) |
19cb3738 | 243 | { |
5fafdf24 | 244 | if (is_windows_drive_prefix(filename) && |
f45512fe | 245 | filename[2] == '\0') |
19cb3738 FB |
246 | return 1; |
247 | if (strstart(filename, "\\\\.\\", NULL) || | |
248 | strstart(filename, "//./", NULL)) | |
249 | return 1; | |
250 | return 0; | |
251 | } | |
252 | #endif | |
253 | ||
83f64091 FB |
254 | static BlockDriver *find_protocol(const char *filename) |
255 | { | |
256 | BlockDriver *drv1; | |
257 | char protocol[128]; | |
1cec71e3 | 258 | int len; |
83f64091 | 259 | const char *p; |
19cb3738 FB |
260 | |
261 | #ifdef _WIN32 | |
f45512fe FB |
262 | if (is_windows_drive(filename) || |
263 | is_windows_drive_prefix(filename)) | |
5efa9d5a | 264 | return bdrv_find_format("raw"); |
19cb3738 | 265 | #endif |
1cec71e3 AL |
266 | p = strchr(filename, ':'); |
267 | if (!p) | |
5efa9d5a | 268 | return bdrv_find_format("raw"); |
1cec71e3 AL |
269 | len = p - filename; |
270 | if (len > sizeof(protocol) - 1) | |
271 | len = sizeof(protocol) - 1; | |
272 | memcpy(protocol, filename, len); | |
273 | protocol[len] = '\0'; | |
83f64091 | 274 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
5fafdf24 | 275 | if (drv1->protocol_name && |
83f64091 FB |
276 | !strcmp(drv1->protocol_name, protocol)) |
277 | return drv1; | |
278 | } | |
279 | return NULL; | |
280 | } | |
281 | ||
f3a5d3f8 CH |
282 | /* |
283 | * Detect host devices. By convention, /dev/cdrom[N] is always | |
284 | * recognized as a host CDROM. | |
285 | */ | |
f3a5d3f8 CH |
286 | static BlockDriver *find_hdev_driver(const char *filename) |
287 | { | |
508c7cb3 CH |
288 | int score_max = 0, score; |
289 | BlockDriver *drv = NULL, *d; | |
f3a5d3f8 | 290 | |
508c7cb3 CH |
291 | for (d = first_drv; d; d = d->next) { |
292 | if (d->bdrv_probe_device) { | |
293 | score = d->bdrv_probe_device(filename); | |
294 | if (score > score_max) { | |
295 | score_max = score; | |
296 | drv = d; | |
297 | } | |
298 | } | |
19cb3738 | 299 | } |
f3a5d3f8 | 300 | |
508c7cb3 | 301 | return drv; |
f3a5d3f8 | 302 | } |
3b46e624 | 303 | |
f3a5d3f8 CH |
304 | static BlockDriver *find_image_format(const char *filename) |
305 | { | |
306 | int ret, score, score_max; | |
307 | BlockDriver *drv1, *drv; | |
308 | uint8_t buf[2048]; | |
309 | BlockDriverState *bs; | |
310 | ||
83f64091 | 311 | drv = find_protocol(filename); |
19cb3738 | 312 | /* no need to test disk image formats for vvfat */ |
c833ab73 | 313 | if (drv && strcmp(drv->format_name, "vvfat") == 0) |
83f64091 | 314 | return drv; |
19cb3738 | 315 | |
83f64091 FB |
316 | ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY); |
317 | if (ret < 0) | |
318 | return NULL; | |
319 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); | |
320 | bdrv_delete(bs); | |
321 | if (ret < 0) { | |
322 | return NULL; | |
323 | } | |
324 | ||
ea2384d3 FB |
325 | score_max = 0; |
326 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { | |
83f64091 FB |
327 | if (drv1->bdrv_probe) { |
328 | score = drv1->bdrv_probe(buf, ret, filename); | |
329 | if (score > score_max) { | |
330 | score_max = score; | |
331 | drv = drv1; | |
332 | } | |
0849bf08 | 333 | } |
fc01f7e7 | 334 | } |
ea2384d3 FB |
335 | return drv; |
336 | } | |
337 | ||
83f64091 | 338 | int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
ea2384d3 | 339 | { |
83f64091 FB |
340 | BlockDriverState *bs; |
341 | int ret; | |
342 | ||
343 | bs = bdrv_new(""); | |
83f64091 FB |
344 | ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL); |
345 | if (ret < 0) { | |
346 | bdrv_delete(bs); | |
347 | return ret; | |
3b0d4f61 | 348 | } |
71d0770c | 349 | bs->growable = 1; |
83f64091 FB |
350 | *pbs = bs; |
351 | return 0; | |
352 | } | |
353 | ||
354 | int bdrv_open(BlockDriverState *bs, const char *filename, int flags) | |
355 | { | |
356 | return bdrv_open2(bs, filename, flags, NULL); | |
ea2384d3 FB |
357 | } |
358 | ||
83f64091 | 359 | int bdrv_open2(BlockDriverState *bs, const char *filename, int flags, |
ea2384d3 FB |
360 | BlockDriver *drv) |
361 | { | |
59f2689d | 362 | int ret, open_flags, try_rw; |
eb5c851f TS |
363 | char tmp_filename[PATH_MAX]; |
364 | char backing_filename[PATH_MAX]; | |
3b46e624 | 365 | |
ea2384d3 FB |
366 | bs->is_temporary = 0; |
367 | bs->encrypted = 0; | |
c0f4ce77 | 368 | bs->valid_key = 0; |
e268ca52 AL |
369 | /* buffer_alignment defaulted to 512, drivers can change this value */ |
370 | bs->buffer_alignment = 512; | |
712e7874 | 371 | |
83f64091 | 372 | if (flags & BDRV_O_SNAPSHOT) { |
ea2384d3 FB |
373 | BlockDriverState *bs1; |
374 | int64_t total_size; | |
7c96d46e | 375 | int is_protocol = 0; |
91a073a9 KW |
376 | BlockDriver *bdrv_qcow2; |
377 | QEMUOptionParameter *options; | |
3b46e624 | 378 | |
ea2384d3 FB |
379 | /* if snapshot, we create a temporary backing file and open it |
380 | instead of opening 'filename' directly */ | |
33e3963e | 381 | |
ea2384d3 FB |
382 | /* if there is a backing file, use it */ |
383 | bs1 = bdrv_new(""); | |
5eb45639 | 384 | ret = bdrv_open2(bs1, filename, 0, drv); |
51d7c00c | 385 | if (ret < 0) { |
ea2384d3 | 386 | bdrv_delete(bs1); |
51d7c00c | 387 | return ret; |
ea2384d3 | 388 | } |
83f64091 | 389 | total_size = bdrv_getlength(bs1) >> SECTOR_BITS; |
7c96d46e AL |
390 | |
391 | if (bs1->drv && bs1->drv->protocol_name) | |
392 | is_protocol = 1; | |
393 | ||
ea2384d3 | 394 | bdrv_delete(bs1); |
3b46e624 | 395 | |
ea2384d3 | 396 | get_tmp_filename(tmp_filename, sizeof(tmp_filename)); |
7c96d46e AL |
397 | |
398 | /* Real path is meaningless for protocols */ | |
399 | if (is_protocol) | |
400 | snprintf(backing_filename, sizeof(backing_filename), | |
401 | "%s", filename); | |
402 | else | |
403 | realpath(filename, backing_filename); | |
404 | ||
91a073a9 KW |
405 | bdrv_qcow2 = bdrv_find_format("qcow2"); |
406 | options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); | |
407 | ||
408 | set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size * 512); | |
409 | set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); | |
410 | if (drv) { | |
411 | set_option_parameter(options, BLOCK_OPT_BACKING_FMT, | |
412 | drv->format_name); | |
413 | } | |
414 | ||
415 | ret = bdrv_create(bdrv_qcow2, tmp_filename, options); | |
51d7c00c AL |
416 | if (ret < 0) { |
417 | return ret; | |
ea2384d3 | 418 | } |
91a073a9 | 419 | |
ea2384d3 | 420 | filename = tmp_filename; |
91a073a9 | 421 | drv = bdrv_qcow2; |
ea2384d3 FB |
422 | bs->is_temporary = 1; |
423 | } | |
712e7874 | 424 | |
ea2384d3 | 425 | pstrcpy(bs->filename, sizeof(bs->filename), filename); |
83f64091 FB |
426 | if (flags & BDRV_O_FILE) { |
427 | drv = find_protocol(filename); | |
51d7c00c | 428 | } else if (!drv) { |
f3a5d3f8 CH |
429 | drv = find_hdev_driver(filename); |
430 | if (!drv) { | |
431 | drv = find_image_format(filename); | |
432 | } | |
51d7c00c AL |
433 | } |
434 | if (!drv) { | |
435 | ret = -ENOENT; | |
436 | goto unlink_and_fail; | |
ea2384d3 FB |
437 | } |
438 | bs->drv = drv; | |
439 | bs->opaque = qemu_mallocz(drv->instance_size); | |
e900a7b7 CH |
440 | |
441 | /* | |
442 | * Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a | |
443 | * write cache to the guest. We do need the fdatasync to flush | |
444 | * out transactions for block allocations, and we maybe have a | |
445 | * volatile write cache in our backing device to deal with. | |
446 | */ | |
447 | if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE)) | |
448 | bs->enable_write_cache = 1; | |
449 | ||
83f64091 FB |
450 | /* Note: for compatibility, we open disk image files as RDWR, and |
451 | RDONLY as fallback */ | |
59f2689d | 452 | try_rw = !bs->read_only || bs->is_temporary; |
83f64091 | 453 | if (!(flags & BDRV_O_FILE)) |
59f2689d NS |
454 | open_flags = (try_rw ? BDRV_O_RDWR : 0) | |
455 | (flags & (BDRV_O_CACHE_MASK|BDRV_O_NATIVE_AIO)); | |
83f64091 FB |
456 | else |
457 | open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT); | |
eb852011 MA |
458 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) |
459 | ret = -ENOTSUP; | |
460 | else | |
461 | ret = drv->bdrv_open(bs, filename, open_flags); | |
a0a83536 | 462 | if ((ret == -EACCES || ret == -EPERM) && !(flags & BDRV_O_FILE)) { |
1cec71e3 | 463 | ret = drv->bdrv_open(bs, filename, open_flags & ~BDRV_O_RDWR); |
83f64091 FB |
464 | bs->read_only = 1; |
465 | } | |
ea2384d3 FB |
466 | if (ret < 0) { |
467 | qemu_free(bs->opaque); | |
6b21b973 FB |
468 | bs->opaque = NULL; |
469 | bs->drv = NULL; | |
51d7c00c AL |
470 | unlink_and_fail: |
471 | if (bs->is_temporary) | |
472 | unlink(filename); | |
83f64091 | 473 | return ret; |
33e3963e | 474 | } |
d15a771d FB |
475 | if (drv->bdrv_getlength) { |
476 | bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; | |
477 | } | |
67b915a5 | 478 | #ifndef _WIN32 |
ea2384d3 FB |
479 | if (bs->is_temporary) { |
480 | unlink(filename); | |
481 | } | |
482 | #endif | |
83f64091 | 483 | if (bs->backing_file[0] != '\0') { |
ea2384d3 | 484 | /* if there is a backing file, use it */ |
5eb45639 | 485 | BlockDriver *back_drv = NULL; |
ea2384d3 | 486 | bs->backing_hd = bdrv_new(""); |
59f2689d NS |
487 | /* pass on read_only property to the backing_hd */ |
488 | bs->backing_hd->read_only = bs->read_only; | |
83f64091 FB |
489 | path_combine(backing_filename, sizeof(backing_filename), |
490 | filename, bs->backing_file); | |
5eb45639 AL |
491 | if (bs->backing_format[0] != '\0') |
492 | back_drv = bdrv_find_format(bs->backing_format); | |
493 | ret = bdrv_open2(bs->backing_hd, backing_filename, open_flags, | |
494 | back_drv); | |
51d7c00c AL |
495 | if (ret < 0) { |
496 | bdrv_close(bs); | |
497 | return ret; | |
498 | } | |
33e3963e FB |
499 | } |
500 | ||
bb5fc20f AL |
501 | if (!bdrv_key_required(bs)) { |
502 | /* call the change callback */ | |
503 | bs->media_changed = 1; | |
504 | if (bs->change_cb) | |
505 | bs->change_cb(bs->change_opaque); | |
506 | } | |
b338082b | 507 | return 0; |
fc01f7e7 FB |
508 | } |
509 | ||
510 | void bdrv_close(BlockDriverState *bs) | |
511 | { | |
19cb3738 | 512 | if (bs->drv) { |
ea2384d3 FB |
513 | if (bs->backing_hd) |
514 | bdrv_delete(bs->backing_hd); | |
515 | bs->drv->bdrv_close(bs); | |
516 | qemu_free(bs->opaque); | |
517 | #ifdef _WIN32 | |
518 | if (bs->is_temporary) { | |
519 | unlink(bs->filename); | |
520 | } | |
67b915a5 | 521 | #endif |
ea2384d3 FB |
522 | bs->opaque = NULL; |
523 | bs->drv = NULL; | |
b338082b FB |
524 | |
525 | /* call the change callback */ | |
19cb3738 | 526 | bs->media_changed = 1; |
b338082b FB |
527 | if (bs->change_cb) |
528 | bs->change_cb(bs->change_opaque); | |
529 | } | |
530 | } | |
531 | ||
532 | void bdrv_delete(BlockDriverState *bs) | |
533 | { | |
34c6f050 AJ |
534 | BlockDriverState **pbs; |
535 | ||
536 | pbs = &bdrv_first; | |
537 | while (*pbs != bs && *pbs != NULL) | |
538 | pbs = &(*pbs)->next; | |
539 | if (*pbs == bs) | |
540 | *pbs = bs->next; | |
541 | ||
b338082b FB |
542 | bdrv_close(bs); |
543 | qemu_free(bs); | |
fc01f7e7 FB |
544 | } |
545 | ||
e97fc193 AL |
546 | /* |
547 | * Run consistency checks on an image | |
548 | * | |
549 | * Returns the number of errors or -errno when an internal error occurs | |
550 | */ | |
551 | int bdrv_check(BlockDriverState *bs) | |
552 | { | |
553 | if (bs->drv->bdrv_check == NULL) { | |
554 | return -ENOTSUP; | |
555 | } | |
556 | ||
557 | return bs->drv->bdrv_check(bs); | |
558 | } | |
559 | ||
33e3963e FB |
560 | /* commit COW file into the raw image */ |
561 | int bdrv_commit(BlockDriverState *bs) | |
562 | { | |
19cb3738 | 563 | BlockDriver *drv = bs->drv; |
83f64091 | 564 | int64_t i, total_sectors; |
ea2384d3 FB |
565 | int n, j; |
566 | unsigned char sector[512]; | |
33e3963e | 567 | |
19cb3738 FB |
568 | if (!drv) |
569 | return -ENOMEDIUM; | |
33e3963e FB |
570 | |
571 | if (bs->read_only) { | |
ea2384d3 | 572 | return -EACCES; |
33e3963e FB |
573 | } |
574 | ||
ea2384d3 FB |
575 | if (!bs->backing_hd) { |
576 | return -ENOTSUP; | |
577 | } | |
33e3963e | 578 | |
83f64091 FB |
579 | total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
580 | for (i = 0; i < total_sectors;) { | |
19cb3738 | 581 | if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { |
ea2384d3 FB |
582 | for(j = 0; j < n; j++) { |
583 | if (bdrv_read(bs, i, sector, 1) != 0) { | |
584 | return -EIO; | |
585 | } | |
586 | ||
587 | if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { | |
588 | return -EIO; | |
589 | } | |
590 | i++; | |
33e3963e | 591 | } |
ea2384d3 FB |
592 | } else { |
593 | i += n; | |
594 | } | |
33e3963e | 595 | } |
95389c86 | 596 | |
19cb3738 FB |
597 | if (drv->bdrv_make_empty) |
598 | return drv->bdrv_make_empty(bs); | |
95389c86 | 599 | |
33e3963e FB |
600 | return 0; |
601 | } | |
602 | ||
71d0770c AL |
603 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
604 | size_t size) | |
605 | { | |
606 | int64_t len; | |
607 | ||
608 | if (!bdrv_is_inserted(bs)) | |
609 | return -ENOMEDIUM; | |
610 | ||
611 | if (bs->growable) | |
612 | return 0; | |
613 | ||
614 | len = bdrv_getlength(bs); | |
615 | ||
fbb7b4e0 KW |
616 | if (offset < 0) |
617 | return -EIO; | |
618 | ||
619 | if ((offset > len) || (len - offset < size)) | |
71d0770c AL |
620 | return -EIO; |
621 | ||
622 | return 0; | |
623 | } | |
624 | ||
625 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, | |
626 | int nb_sectors) | |
627 | { | |
999dec57 | 628 | return bdrv_check_byte_request(bs, sector_num * 512, nb_sectors * 512); |
71d0770c AL |
629 | } |
630 | ||
19cb3738 | 631 | /* return < 0 if error. See bdrv_write() for the return codes */ |
5fafdf24 | 632 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
633 | uint8_t *buf, int nb_sectors) |
634 | { | |
ea2384d3 FB |
635 | BlockDriver *drv = bs->drv; |
636 | ||
19cb3738 FB |
637 | if (!drv) |
638 | return -ENOMEDIUM; | |
71d0770c AL |
639 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
640 | return -EIO; | |
b338082b | 641 | |
eda578e5 | 642 | return drv->bdrv_read(bs, sector_num, buf, nb_sectors); |
fc01f7e7 FB |
643 | } |
644 | ||
7cd1e32a | 645 | static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num, |
646 | int nb_sectors, int dirty) | |
647 | { | |
648 | int64_t start, end; | |
649 | start = sector_num / SECTORS_PER_DIRTY_CHUNK; | |
650 | end = (sector_num + nb_sectors) / SECTORS_PER_DIRTY_CHUNK; | |
651 | ||
652 | for(; start <= end; start++) { | |
653 | bs->dirty_bitmap[start] = dirty; | |
654 | } | |
655 | } | |
656 | ||
5fafdf24 | 657 | /* Return < 0 if error. Important errors are: |
19cb3738 FB |
658 | -EIO generic I/O error (may happen for all errors) |
659 | -ENOMEDIUM No media inserted. | |
660 | -EINVAL Invalid sector number or nb_sectors | |
661 | -EACCES Trying to write a read-only device | |
662 | */ | |
5fafdf24 | 663 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
664 | const uint8_t *buf, int nb_sectors) |
665 | { | |
83f64091 | 666 | BlockDriver *drv = bs->drv; |
19cb3738 FB |
667 | if (!bs->drv) |
668 | return -ENOMEDIUM; | |
0849bf08 | 669 | if (bs->read_only) |
19cb3738 | 670 | return -EACCES; |
71d0770c AL |
671 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
672 | return -EIO; | |
7cd1e32a | 673 | |
674 | if(bs->dirty_tracking) { | |
675 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); | |
676 | } | |
677 | ||
42fb2807 | 678 | return drv->bdrv_write(bs, sector_num, buf, nb_sectors); |
83f64091 FB |
679 | } |
680 | ||
eda578e5 AL |
681 | int bdrv_pread(BlockDriverState *bs, int64_t offset, |
682 | void *buf, int count1) | |
83f64091 | 683 | { |
83f64091 FB |
684 | uint8_t tmp_buf[SECTOR_SIZE]; |
685 | int len, nb_sectors, count; | |
686 | int64_t sector_num; | |
687 | ||
688 | count = count1; | |
689 | /* first read to align to sector start */ | |
690 | len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1); | |
691 | if (len > count) | |
692 | len = count; | |
693 | sector_num = offset >> SECTOR_BITS; | |
694 | if (len > 0) { | |
695 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
696 | return -EIO; | |
697 | memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len); | |
698 | count -= len; | |
699 | if (count == 0) | |
700 | return count1; | |
701 | sector_num++; | |
702 | buf += len; | |
703 | } | |
704 | ||
705 | /* read the sectors "in place" */ | |
706 | nb_sectors = count >> SECTOR_BITS; | |
707 | if (nb_sectors > 0) { | |
708 | if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0) | |
709 | return -EIO; | |
710 | sector_num += nb_sectors; | |
711 | len = nb_sectors << SECTOR_BITS; | |
712 | buf += len; | |
713 | count -= len; | |
714 | } | |
715 | ||
716 | /* add data from the last sector */ | |
717 | if (count > 0) { | |
718 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
719 | return -EIO; | |
720 | memcpy(buf, tmp_buf, count); | |
721 | } | |
722 | return count1; | |
723 | } | |
724 | ||
eda578e5 AL |
725 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, |
726 | const void *buf, int count1) | |
83f64091 | 727 | { |
83f64091 FB |
728 | uint8_t tmp_buf[SECTOR_SIZE]; |
729 | int len, nb_sectors, count; | |
730 | int64_t sector_num; | |
731 | ||
732 | count = count1; | |
733 | /* first write to align to sector start */ | |
734 | len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1); | |
735 | if (len > count) | |
736 | len = count; | |
737 | sector_num = offset >> SECTOR_BITS; | |
738 | if (len > 0) { | |
739 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
740 | return -EIO; | |
741 | memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len); | |
742 | if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) | |
743 | return -EIO; | |
744 | count -= len; | |
745 | if (count == 0) | |
746 | return count1; | |
747 | sector_num++; | |
748 | buf += len; | |
749 | } | |
750 | ||
751 | /* write the sectors "in place" */ | |
752 | nb_sectors = count >> SECTOR_BITS; | |
753 | if (nb_sectors > 0) { | |
754 | if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0) | |
755 | return -EIO; | |
756 | sector_num += nb_sectors; | |
757 | len = nb_sectors << SECTOR_BITS; | |
758 | buf += len; | |
759 | count -= len; | |
760 | } | |
761 | ||
762 | /* add data from the last sector */ | |
763 | if (count > 0) { | |
764 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
765 | return -EIO; | |
766 | memcpy(tmp_buf, buf, count); | |
767 | if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) | |
768 | return -EIO; | |
769 | } | |
770 | return count1; | |
771 | } | |
83f64091 | 772 | |
83f64091 FB |
773 | /** |
774 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
775 | */ | |
776 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
777 | { | |
778 | BlockDriver *drv = bs->drv; | |
779 | if (!drv) | |
19cb3738 | 780 | return -ENOMEDIUM; |
83f64091 FB |
781 | if (!drv->bdrv_truncate) |
782 | return -ENOTSUP; | |
59f2689d NS |
783 | if (bs->read_only) |
784 | return -EACCES; | |
83f64091 FB |
785 | return drv->bdrv_truncate(bs, offset); |
786 | } | |
787 | ||
788 | /** | |
789 | * Length of a file in bytes. Return < 0 if error or unknown. | |
790 | */ | |
791 | int64_t bdrv_getlength(BlockDriverState *bs) | |
792 | { | |
793 | BlockDriver *drv = bs->drv; | |
794 | if (!drv) | |
19cb3738 | 795 | return -ENOMEDIUM; |
83f64091 FB |
796 | if (!drv->bdrv_getlength) { |
797 | /* legacy mode */ | |
798 | return bs->total_sectors * SECTOR_SIZE; | |
799 | } | |
800 | return drv->bdrv_getlength(bs); | |
fc01f7e7 FB |
801 | } |
802 | ||
19cb3738 | 803 | /* return 0 as number of sectors if no device present or error */ |
96b8f136 | 804 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
fc01f7e7 | 805 | { |
19cb3738 FB |
806 | int64_t length; |
807 | length = bdrv_getlength(bs); | |
808 | if (length < 0) | |
809 | length = 0; | |
810 | else | |
811 | length = length >> SECTOR_BITS; | |
812 | *nb_sectors_ptr = length; | |
fc01f7e7 | 813 | } |
cf98951b | 814 | |
f3d54fc4 AL |
815 | struct partition { |
816 | uint8_t boot_ind; /* 0x80 - active */ | |
817 | uint8_t head; /* starting head */ | |
818 | uint8_t sector; /* starting sector */ | |
819 | uint8_t cyl; /* starting cylinder */ | |
820 | uint8_t sys_ind; /* What partition type */ | |
821 | uint8_t end_head; /* end head */ | |
822 | uint8_t end_sector; /* end sector */ | |
823 | uint8_t end_cyl; /* end cylinder */ | |
824 | uint32_t start_sect; /* starting sector counting from 0 */ | |
825 | uint32_t nr_sects; /* nr of sectors in partition */ | |
826 | } __attribute__((packed)); | |
827 | ||
828 | /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */ | |
829 | static int guess_disk_lchs(BlockDriverState *bs, | |
830 | int *pcylinders, int *pheads, int *psectors) | |
831 | { | |
832 | uint8_t buf[512]; | |
833 | int ret, i, heads, sectors, cylinders; | |
834 | struct partition *p; | |
835 | uint32_t nr_sects; | |
a38131b6 | 836 | uint64_t nb_sectors; |
f3d54fc4 AL |
837 | |
838 | bdrv_get_geometry(bs, &nb_sectors); | |
839 | ||
840 | ret = bdrv_read(bs, 0, buf, 1); | |
841 | if (ret < 0) | |
842 | return -1; | |
843 | /* test msdos magic */ | |
844 | if (buf[510] != 0x55 || buf[511] != 0xaa) | |
845 | return -1; | |
846 | for(i = 0; i < 4; i++) { | |
847 | p = ((struct partition *)(buf + 0x1be)) + i; | |
848 | nr_sects = le32_to_cpu(p->nr_sects); | |
849 | if (nr_sects && p->end_head) { | |
850 | /* We make the assumption that the partition terminates on | |
851 | a cylinder boundary */ | |
852 | heads = p->end_head + 1; | |
853 | sectors = p->end_sector & 63; | |
854 | if (sectors == 0) | |
855 | continue; | |
856 | cylinders = nb_sectors / (heads * sectors); | |
857 | if (cylinders < 1 || cylinders > 16383) | |
858 | continue; | |
859 | *pheads = heads; | |
860 | *psectors = sectors; | |
861 | *pcylinders = cylinders; | |
862 | #if 0 | |
863 | printf("guessed geometry: LCHS=%d %d %d\n", | |
864 | cylinders, heads, sectors); | |
865 | #endif | |
866 | return 0; | |
867 | } | |
868 | } | |
869 | return -1; | |
870 | } | |
871 | ||
872 | void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) | |
873 | { | |
874 | int translation, lba_detected = 0; | |
875 | int cylinders, heads, secs; | |
a38131b6 | 876 | uint64_t nb_sectors; |
f3d54fc4 AL |
877 | |
878 | /* if a geometry hint is available, use it */ | |
879 | bdrv_get_geometry(bs, &nb_sectors); | |
880 | bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); | |
881 | translation = bdrv_get_translation_hint(bs); | |
882 | if (cylinders != 0) { | |
883 | *pcyls = cylinders; | |
884 | *pheads = heads; | |
885 | *psecs = secs; | |
886 | } else { | |
887 | if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { | |
888 | if (heads > 16) { | |
889 | /* if heads > 16, it means that a BIOS LBA | |
890 | translation was active, so the default | |
891 | hardware geometry is OK */ | |
892 | lba_detected = 1; | |
893 | goto default_geometry; | |
894 | } else { | |
895 | *pcyls = cylinders; | |
896 | *pheads = heads; | |
897 | *psecs = secs; | |
898 | /* disable any translation to be in sync with | |
899 | the logical geometry */ | |
900 | if (translation == BIOS_ATA_TRANSLATION_AUTO) { | |
901 | bdrv_set_translation_hint(bs, | |
902 | BIOS_ATA_TRANSLATION_NONE); | |
903 | } | |
904 | } | |
905 | } else { | |
906 | default_geometry: | |
907 | /* if no geometry, use a standard physical disk geometry */ | |
908 | cylinders = nb_sectors / (16 * 63); | |
909 | ||
910 | if (cylinders > 16383) | |
911 | cylinders = 16383; | |
912 | else if (cylinders < 2) | |
913 | cylinders = 2; | |
914 | *pcyls = cylinders; | |
915 | *pheads = 16; | |
916 | *psecs = 63; | |
917 | if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { | |
918 | if ((*pcyls * *pheads) <= 131072) { | |
919 | bdrv_set_translation_hint(bs, | |
920 | BIOS_ATA_TRANSLATION_LARGE); | |
921 | } else { | |
922 | bdrv_set_translation_hint(bs, | |
923 | BIOS_ATA_TRANSLATION_LBA); | |
924 | } | |
925 | } | |
926 | } | |
927 | bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); | |
928 | } | |
929 | } | |
930 | ||
5fafdf24 | 931 | void bdrv_set_geometry_hint(BlockDriverState *bs, |
b338082b FB |
932 | int cyls, int heads, int secs) |
933 | { | |
934 | bs->cyls = cyls; | |
935 | bs->heads = heads; | |
936 | bs->secs = secs; | |
937 | } | |
938 | ||
939 | void bdrv_set_type_hint(BlockDriverState *bs, int type) | |
940 | { | |
941 | bs->type = type; | |
942 | bs->removable = ((type == BDRV_TYPE_CDROM || | |
943 | type == BDRV_TYPE_FLOPPY)); | |
944 | } | |
945 | ||
46d4767d FB |
946 | void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
947 | { | |
948 | bs->translation = translation; | |
949 | } | |
950 | ||
5fafdf24 | 951 | void bdrv_get_geometry_hint(BlockDriverState *bs, |
b338082b FB |
952 | int *pcyls, int *pheads, int *psecs) |
953 | { | |
954 | *pcyls = bs->cyls; | |
955 | *pheads = bs->heads; | |
956 | *psecs = bs->secs; | |
957 | } | |
958 | ||
959 | int bdrv_get_type_hint(BlockDriverState *bs) | |
960 | { | |
961 | return bs->type; | |
962 | } | |
963 | ||
46d4767d FB |
964 | int bdrv_get_translation_hint(BlockDriverState *bs) |
965 | { | |
966 | return bs->translation; | |
967 | } | |
968 | ||
b338082b FB |
969 | int bdrv_is_removable(BlockDriverState *bs) |
970 | { | |
971 | return bs->removable; | |
972 | } | |
973 | ||
974 | int bdrv_is_read_only(BlockDriverState *bs) | |
975 | { | |
976 | return bs->read_only; | |
977 | } | |
978 | ||
59f2689d NS |
979 | int bdrv_set_read_only(BlockDriverState *bs, int read_only) |
980 | { | |
981 | int ret = bs->read_only; | |
982 | bs->read_only = read_only; | |
983 | return ret; | |
984 | } | |
985 | ||
985a03b0 TS |
986 | int bdrv_is_sg(BlockDriverState *bs) |
987 | { | |
988 | return bs->sg; | |
989 | } | |
990 | ||
e900a7b7 CH |
991 | int bdrv_enable_write_cache(BlockDriverState *bs) |
992 | { | |
993 | return bs->enable_write_cache; | |
994 | } | |
995 | ||
19cb3738 | 996 | /* XXX: no longer used */ |
5fafdf24 | 997 | void bdrv_set_change_cb(BlockDriverState *bs, |
b338082b FB |
998 | void (*change_cb)(void *opaque), void *opaque) |
999 | { | |
1000 | bs->change_cb = change_cb; | |
1001 | bs->change_opaque = opaque; | |
1002 | } | |
1003 | ||
ea2384d3 FB |
1004 | int bdrv_is_encrypted(BlockDriverState *bs) |
1005 | { | |
1006 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
1007 | return 1; | |
1008 | return bs->encrypted; | |
1009 | } | |
1010 | ||
c0f4ce77 AL |
1011 | int bdrv_key_required(BlockDriverState *bs) |
1012 | { | |
1013 | BlockDriverState *backing_hd = bs->backing_hd; | |
1014 | ||
1015 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) | |
1016 | return 1; | |
1017 | return (bs->encrypted && !bs->valid_key); | |
1018 | } | |
1019 | ||
ea2384d3 FB |
1020 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
1021 | { | |
1022 | int ret; | |
1023 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
1024 | ret = bdrv_set_key(bs->backing_hd, key); | |
1025 | if (ret < 0) | |
1026 | return ret; | |
1027 | if (!bs->encrypted) | |
1028 | return 0; | |
1029 | } | |
1030 | if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key) | |
1031 | return -1; | |
c0f4ce77 | 1032 | ret = bs->drv->bdrv_set_key(bs, key); |
bb5fc20f AL |
1033 | if (ret < 0) { |
1034 | bs->valid_key = 0; | |
1035 | } else if (!bs->valid_key) { | |
1036 | bs->valid_key = 1; | |
1037 | /* call the change callback now, we skipped it on open */ | |
1038 | bs->media_changed = 1; | |
1039 | if (bs->change_cb) | |
1040 | bs->change_cb(bs->change_opaque); | |
1041 | } | |
c0f4ce77 | 1042 | return ret; |
ea2384d3 FB |
1043 | } |
1044 | ||
1045 | void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) | |
1046 | { | |
19cb3738 | 1047 | if (!bs->drv) { |
ea2384d3 FB |
1048 | buf[0] = '\0'; |
1049 | } else { | |
1050 | pstrcpy(buf, buf_size, bs->drv->format_name); | |
1051 | } | |
1052 | } | |
1053 | ||
5fafdf24 | 1054 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
ea2384d3 FB |
1055 | void *opaque) |
1056 | { | |
1057 | BlockDriver *drv; | |
1058 | ||
1059 | for (drv = first_drv; drv != NULL; drv = drv->next) { | |
1060 | it(opaque, drv->format_name); | |
1061 | } | |
1062 | } | |
1063 | ||
b338082b FB |
1064 | BlockDriverState *bdrv_find(const char *name) |
1065 | { | |
1066 | BlockDriverState *bs; | |
1067 | ||
1068 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
1069 | if (!strcmp(name, bs->device_name)) | |
1070 | return bs; | |
1071 | } | |
1072 | return NULL; | |
1073 | } | |
1074 | ||
51de9760 | 1075 | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
81d0912d FB |
1076 | { |
1077 | BlockDriverState *bs; | |
1078 | ||
1079 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
51de9760 | 1080 | it(opaque, bs); |
81d0912d FB |
1081 | } |
1082 | } | |
1083 | ||
ea2384d3 FB |
1084 | const char *bdrv_get_device_name(BlockDriverState *bs) |
1085 | { | |
1086 | return bs->device_name; | |
1087 | } | |
1088 | ||
7a6cba61 PB |
1089 | void bdrv_flush(BlockDriverState *bs) |
1090 | { | |
081501da AL |
1091 | if (!bs->drv) |
1092 | return; | |
7a6cba61 PB |
1093 | if (bs->drv->bdrv_flush) |
1094 | bs->drv->bdrv_flush(bs); | |
1095 | if (bs->backing_hd) | |
1096 | bdrv_flush(bs->backing_hd); | |
1097 | } | |
1098 | ||
c6ca28d6 AL |
1099 | void bdrv_flush_all(void) |
1100 | { | |
1101 | BlockDriverState *bs; | |
1102 | ||
1103 | for (bs = bdrv_first; bs != NULL; bs = bs->next) | |
1104 | if (bs->drv && !bdrv_is_read_only(bs) && | |
1105 | (!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) | |
1106 | bdrv_flush(bs); | |
1107 | } | |
1108 | ||
f58c7b35 TS |
1109 | /* |
1110 | * Returns true iff the specified sector is present in the disk image. Drivers | |
1111 | * not implementing the functionality are assumed to not support backing files, | |
1112 | * hence all their sectors are reported as allocated. | |
1113 | * | |
1114 | * 'pnum' is set to the number of sectors (including and immediately following | |
1115 | * the specified sector) that are known to be in the same | |
1116 | * allocated/unallocated state. | |
1117 | * | |
1118 | * 'nb_sectors' is the max value 'pnum' should be set to. | |
1119 | */ | |
1120 | int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, | |
1121 | int *pnum) | |
1122 | { | |
1123 | int64_t n; | |
1124 | if (!bs->drv->bdrv_is_allocated) { | |
1125 | if (sector_num >= bs->total_sectors) { | |
1126 | *pnum = 0; | |
1127 | return 0; | |
1128 | } | |
1129 | n = bs->total_sectors - sector_num; | |
1130 | *pnum = (n < nb_sectors) ? (n) : (nb_sectors); | |
1131 | return 1; | |
1132 | } | |
1133 | return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum); | |
1134 | } | |
1135 | ||
376253ec | 1136 | void bdrv_info(Monitor *mon) |
b338082b FB |
1137 | { |
1138 | BlockDriverState *bs; | |
1139 | ||
1140 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
376253ec AL |
1141 | monitor_printf(mon, "%s:", bs->device_name); |
1142 | monitor_printf(mon, " type="); | |
b338082b FB |
1143 | switch(bs->type) { |
1144 | case BDRV_TYPE_HD: | |
376253ec | 1145 | monitor_printf(mon, "hd"); |
b338082b FB |
1146 | break; |
1147 | case BDRV_TYPE_CDROM: | |
376253ec | 1148 | monitor_printf(mon, "cdrom"); |
b338082b FB |
1149 | break; |
1150 | case BDRV_TYPE_FLOPPY: | |
376253ec | 1151 | monitor_printf(mon, "floppy"); |
b338082b FB |
1152 | break; |
1153 | } | |
376253ec | 1154 | monitor_printf(mon, " removable=%d", bs->removable); |
b338082b | 1155 | if (bs->removable) { |
376253ec | 1156 | monitor_printf(mon, " locked=%d", bs->locked); |
b338082b | 1157 | } |
19cb3738 | 1158 | if (bs->drv) { |
376253ec AL |
1159 | monitor_printf(mon, " file="); |
1160 | monitor_print_filename(mon, bs->filename); | |
fef30743 | 1161 | if (bs->backing_file[0] != '\0') { |
376253ec AL |
1162 | monitor_printf(mon, " backing_file="); |
1163 | monitor_print_filename(mon, bs->backing_file); | |
1164 | } | |
1165 | monitor_printf(mon, " ro=%d", bs->read_only); | |
1166 | monitor_printf(mon, " drv=%s", bs->drv->format_name); | |
1167 | monitor_printf(mon, " encrypted=%d", bdrv_is_encrypted(bs)); | |
b338082b | 1168 | } else { |
376253ec | 1169 | monitor_printf(mon, " [not inserted]"); |
b338082b | 1170 | } |
376253ec | 1171 | monitor_printf(mon, "\n"); |
b338082b FB |
1172 | } |
1173 | } | |
a36e69dd TS |
1174 | |
1175 | /* The "info blockstats" command. */ | |
376253ec | 1176 | void bdrv_info_stats(Monitor *mon) |
a36e69dd TS |
1177 | { |
1178 | BlockDriverState *bs; | |
1179 | ||
1180 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
376253ec AL |
1181 | monitor_printf(mon, "%s:" |
1182 | " rd_bytes=%" PRIu64 | |
1183 | " wr_bytes=%" PRIu64 | |
1184 | " rd_operations=%" PRIu64 | |
1185 | " wr_operations=%" PRIu64 | |
ebf53fcd | 1186 | "\n", |
376253ec AL |
1187 | bs->device_name, |
1188 | bs->rd_bytes, bs->wr_bytes, | |
1189 | bs->rd_ops, bs->wr_ops); | |
a36e69dd TS |
1190 | } |
1191 | } | |
ea2384d3 | 1192 | |
045df330 AL |
1193 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
1194 | { | |
1195 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
1196 | return bs->backing_file; | |
1197 | else if (bs->encrypted) | |
1198 | return bs->filename; | |
1199 | else | |
1200 | return NULL; | |
1201 | } | |
1202 | ||
5fafdf24 | 1203 | void bdrv_get_backing_filename(BlockDriverState *bs, |
83f64091 FB |
1204 | char *filename, int filename_size) |
1205 | { | |
1206 | if (!bs->backing_hd) { | |
1207 | pstrcpy(filename, filename_size, ""); | |
1208 | } else { | |
1209 | pstrcpy(filename, filename_size, bs->backing_file); | |
1210 | } | |
1211 | } | |
1212 | ||
5fafdf24 | 1213 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
faea38e7 FB |
1214 | const uint8_t *buf, int nb_sectors) |
1215 | { | |
1216 | BlockDriver *drv = bs->drv; | |
1217 | if (!drv) | |
19cb3738 | 1218 | return -ENOMEDIUM; |
faea38e7 FB |
1219 | if (!drv->bdrv_write_compressed) |
1220 | return -ENOTSUP; | |
fbb7b4e0 KW |
1221 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
1222 | return -EIO; | |
7cd1e32a | 1223 | |
1224 | if(bs->dirty_tracking) { | |
1225 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); | |
1226 | } | |
1227 | ||
faea38e7 FB |
1228 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
1229 | } | |
3b46e624 | 1230 | |
faea38e7 FB |
1231 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
1232 | { | |
1233 | BlockDriver *drv = bs->drv; | |
1234 | if (!drv) | |
19cb3738 | 1235 | return -ENOMEDIUM; |
faea38e7 FB |
1236 | if (!drv->bdrv_get_info) |
1237 | return -ENOTSUP; | |
1238 | memset(bdi, 0, sizeof(*bdi)); | |
1239 | return drv->bdrv_get_info(bs, bdi); | |
1240 | } | |
1241 | ||
45566e9c CH |
1242 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
1243 | int64_t pos, int size) | |
178e08a5 AL |
1244 | { |
1245 | BlockDriver *drv = bs->drv; | |
1246 | if (!drv) | |
1247 | return -ENOMEDIUM; | |
45566e9c | 1248 | if (!drv->bdrv_save_vmstate) |
178e08a5 | 1249 | return -ENOTSUP; |
45566e9c | 1250 | return drv->bdrv_save_vmstate(bs, buf, pos, size); |
178e08a5 AL |
1251 | } |
1252 | ||
45566e9c CH |
1253 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
1254 | int64_t pos, int size) | |
178e08a5 AL |
1255 | { |
1256 | BlockDriver *drv = bs->drv; | |
1257 | if (!drv) | |
1258 | return -ENOMEDIUM; | |
45566e9c | 1259 | if (!drv->bdrv_load_vmstate) |
178e08a5 | 1260 | return -ENOTSUP; |
45566e9c | 1261 | return drv->bdrv_load_vmstate(bs, buf, pos, size); |
178e08a5 AL |
1262 | } |
1263 | ||
faea38e7 FB |
1264 | /**************************************************************/ |
1265 | /* handling of snapshots */ | |
1266 | ||
5fafdf24 | 1267 | int bdrv_snapshot_create(BlockDriverState *bs, |
faea38e7 FB |
1268 | QEMUSnapshotInfo *sn_info) |
1269 | { | |
1270 | BlockDriver *drv = bs->drv; | |
1271 | if (!drv) | |
19cb3738 | 1272 | return -ENOMEDIUM; |
faea38e7 FB |
1273 | if (!drv->bdrv_snapshot_create) |
1274 | return -ENOTSUP; | |
1275 | return drv->bdrv_snapshot_create(bs, sn_info); | |
1276 | } | |
1277 | ||
5fafdf24 | 1278 | int bdrv_snapshot_goto(BlockDriverState *bs, |
faea38e7 FB |
1279 | const char *snapshot_id) |
1280 | { | |
1281 | BlockDriver *drv = bs->drv; | |
1282 | if (!drv) | |
19cb3738 | 1283 | return -ENOMEDIUM; |
faea38e7 FB |
1284 | if (!drv->bdrv_snapshot_goto) |
1285 | return -ENOTSUP; | |
1286 | return drv->bdrv_snapshot_goto(bs, snapshot_id); | |
1287 | } | |
1288 | ||
1289 | int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) | |
1290 | { | |
1291 | BlockDriver *drv = bs->drv; | |
1292 | if (!drv) | |
19cb3738 | 1293 | return -ENOMEDIUM; |
faea38e7 FB |
1294 | if (!drv->bdrv_snapshot_delete) |
1295 | return -ENOTSUP; | |
1296 | return drv->bdrv_snapshot_delete(bs, snapshot_id); | |
1297 | } | |
1298 | ||
5fafdf24 | 1299 | int bdrv_snapshot_list(BlockDriverState *bs, |
faea38e7 FB |
1300 | QEMUSnapshotInfo **psn_info) |
1301 | { | |
1302 | BlockDriver *drv = bs->drv; | |
1303 | if (!drv) | |
19cb3738 | 1304 | return -ENOMEDIUM; |
faea38e7 FB |
1305 | if (!drv->bdrv_snapshot_list) |
1306 | return -ENOTSUP; | |
1307 | return drv->bdrv_snapshot_list(bs, psn_info); | |
1308 | } | |
1309 | ||
1310 | #define NB_SUFFIXES 4 | |
1311 | ||
1312 | char *get_human_readable_size(char *buf, int buf_size, int64_t size) | |
1313 | { | |
1314 | static const char suffixes[NB_SUFFIXES] = "KMGT"; | |
1315 | int64_t base; | |
1316 | int i; | |
1317 | ||
1318 | if (size <= 999) { | |
1319 | snprintf(buf, buf_size, "%" PRId64, size); | |
1320 | } else { | |
1321 | base = 1024; | |
1322 | for(i = 0; i < NB_SUFFIXES; i++) { | |
1323 | if (size < (10 * base)) { | |
5fafdf24 | 1324 | snprintf(buf, buf_size, "%0.1f%c", |
faea38e7 FB |
1325 | (double)size / base, |
1326 | suffixes[i]); | |
1327 | break; | |
1328 | } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { | |
5fafdf24 | 1329 | snprintf(buf, buf_size, "%" PRId64 "%c", |
faea38e7 FB |
1330 | ((size + (base >> 1)) / base), |
1331 | suffixes[i]); | |
1332 | break; | |
1333 | } | |
1334 | base = base * 1024; | |
1335 | } | |
1336 | } | |
1337 | return buf; | |
1338 | } | |
1339 | ||
1340 | char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) | |
1341 | { | |
1342 | char buf1[128], date_buf[128], clock_buf[128]; | |
3b9f94e1 FB |
1343 | #ifdef _WIN32 |
1344 | struct tm *ptm; | |
1345 | #else | |
faea38e7 | 1346 | struct tm tm; |
3b9f94e1 | 1347 | #endif |
faea38e7 FB |
1348 | time_t ti; |
1349 | int64_t secs; | |
1350 | ||
1351 | if (!sn) { | |
5fafdf24 TS |
1352 | snprintf(buf, buf_size, |
1353 | "%-10s%-20s%7s%20s%15s", | |
faea38e7 FB |
1354 | "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
1355 | } else { | |
1356 | ti = sn->date_sec; | |
3b9f94e1 FB |
1357 | #ifdef _WIN32 |
1358 | ptm = localtime(&ti); | |
1359 | strftime(date_buf, sizeof(date_buf), | |
1360 | "%Y-%m-%d %H:%M:%S", ptm); | |
1361 | #else | |
faea38e7 FB |
1362 | localtime_r(&ti, &tm); |
1363 | strftime(date_buf, sizeof(date_buf), | |
1364 | "%Y-%m-%d %H:%M:%S", &tm); | |
3b9f94e1 | 1365 | #endif |
faea38e7 FB |
1366 | secs = sn->vm_clock_nsec / 1000000000; |
1367 | snprintf(clock_buf, sizeof(clock_buf), | |
1368 | "%02d:%02d:%02d.%03d", | |
1369 | (int)(secs / 3600), | |
1370 | (int)((secs / 60) % 60), | |
5fafdf24 | 1371 | (int)(secs % 60), |
faea38e7 FB |
1372 | (int)((sn->vm_clock_nsec / 1000000) % 1000)); |
1373 | snprintf(buf, buf_size, | |
5fafdf24 | 1374 | "%-10s%-20s%7s%20s%15s", |
faea38e7 FB |
1375 | sn->id_str, sn->name, |
1376 | get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), | |
1377 | date_buf, | |
1378 | clock_buf); | |
1379 | } | |
1380 | return buf; | |
1381 | } | |
1382 | ||
83f64091 | 1383 | |
ea2384d3 | 1384 | /**************************************************************/ |
83f64091 | 1385 | /* async I/Os */ |
ea2384d3 | 1386 | |
3b69e4b9 | 1387 | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
f141eafe | 1388 | QEMUIOVector *qiov, int nb_sectors, |
3b69e4b9 | 1389 | BlockDriverCompletionFunc *cb, void *opaque) |
83f64091 FB |
1390 | { |
1391 | BlockDriver *drv = bs->drv; | |
a36e69dd | 1392 | BlockDriverAIOCB *ret; |
83f64091 | 1393 | |
19cb3738 | 1394 | if (!drv) |
ce1a14dc | 1395 | return NULL; |
71d0770c AL |
1396 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
1397 | return NULL; | |
3b46e624 | 1398 | |
f141eafe AL |
1399 | ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors, |
1400 | cb, opaque); | |
a36e69dd TS |
1401 | |
1402 | if (ret) { | |
1403 | /* Update stats even though technically transfer has not happened. */ | |
1404 | bs->rd_bytes += (unsigned) nb_sectors * SECTOR_SIZE; | |
1405 | bs->rd_ops ++; | |
1406 | } | |
1407 | ||
1408 | return ret; | |
ea2384d3 FB |
1409 | } |
1410 | ||
f141eafe AL |
1411 | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
1412 | QEMUIOVector *qiov, int nb_sectors, | |
1413 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 1414 | { |
83f64091 | 1415 | BlockDriver *drv = bs->drv; |
a36e69dd | 1416 | BlockDriverAIOCB *ret; |
ea2384d3 | 1417 | |
19cb3738 | 1418 | if (!drv) |
ce1a14dc | 1419 | return NULL; |
83f64091 | 1420 | if (bs->read_only) |
ce1a14dc | 1421 | return NULL; |
71d0770c AL |
1422 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
1423 | return NULL; | |
83f64091 | 1424 | |
7cd1e32a | 1425 | if(bs->dirty_tracking) { |
1426 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); | |
1427 | } | |
1428 | ||
f141eafe AL |
1429 | ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors, |
1430 | cb, opaque); | |
a36e69dd TS |
1431 | |
1432 | if (ret) { | |
1433 | /* Update stats even though technically transfer has not happened. */ | |
1434 | bs->wr_bytes += (unsigned) nb_sectors * SECTOR_SIZE; | |
1435 | bs->wr_ops ++; | |
1436 | } | |
1437 | ||
1438 | return ret; | |
83f64091 FB |
1439 | } |
1440 | ||
40b4f539 KW |
1441 | |
1442 | typedef struct MultiwriteCB { | |
1443 | int error; | |
1444 | int num_requests; | |
1445 | int num_callbacks; | |
1446 | struct { | |
1447 | BlockDriverCompletionFunc *cb; | |
1448 | void *opaque; | |
1449 | QEMUIOVector *free_qiov; | |
1450 | void *free_buf; | |
1451 | } callbacks[]; | |
1452 | } MultiwriteCB; | |
1453 | ||
1454 | static void multiwrite_user_cb(MultiwriteCB *mcb) | |
1455 | { | |
1456 | int i; | |
1457 | ||
1458 | for (i = 0; i < mcb->num_callbacks; i++) { | |
1459 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); | |
1460 | qemu_free(mcb->callbacks[i].free_qiov); | |
1461 | qemu_free(mcb->callbacks[i].free_buf); | |
1462 | } | |
1463 | } | |
1464 | ||
1465 | static void multiwrite_cb(void *opaque, int ret) | |
1466 | { | |
1467 | MultiwriteCB *mcb = opaque; | |
1468 | ||
1469 | if (ret < 0) { | |
1470 | mcb->error = ret; | |
1471 | multiwrite_user_cb(mcb); | |
1472 | } | |
1473 | ||
1474 | mcb->num_requests--; | |
1475 | if (mcb->num_requests == 0) { | |
1476 | if (mcb->error == 0) { | |
1477 | multiwrite_user_cb(mcb); | |
1478 | } | |
1479 | qemu_free(mcb); | |
1480 | } | |
1481 | } | |
1482 | ||
1483 | static int multiwrite_req_compare(const void *a, const void *b) | |
1484 | { | |
1485 | return (((BlockRequest*) a)->sector - ((BlockRequest*) b)->sector); | |
1486 | } | |
1487 | ||
1488 | /* | |
1489 | * Takes a bunch of requests and tries to merge them. Returns the number of | |
1490 | * requests that remain after merging. | |
1491 | */ | |
1492 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, | |
1493 | int num_reqs, MultiwriteCB *mcb) | |
1494 | { | |
1495 | int i, outidx; | |
1496 | ||
1497 | // Sort requests by start sector | |
1498 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); | |
1499 | ||
1500 | // Check if adjacent requests touch the same clusters. If so, combine them, | |
1501 | // filling up gaps with zero sectors. | |
1502 | outidx = 0; | |
1503 | for (i = 1; i < num_reqs; i++) { | |
1504 | int merge = 0; | |
1505 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; | |
1506 | ||
1507 | // This handles the cases that are valid for all block drivers, namely | |
1508 | // exactly sequential writes and overlapping writes. | |
1509 | if (reqs[i].sector <= oldreq_last) { | |
1510 | merge = 1; | |
1511 | } | |
1512 | ||
1513 | // The block driver may decide that it makes sense to combine requests | |
1514 | // even if there is a gap of some sectors between them. In this case, | |
1515 | // the gap is filled with zeros (therefore only applicable for yet | |
1516 | // unused space in format like qcow2). | |
1517 | if (!merge && bs->drv->bdrv_merge_requests) { | |
1518 | merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]); | |
1519 | } | |
1520 | ||
1521 | if (merge) { | |
1522 | size_t size; | |
1523 | QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov)); | |
1524 | qemu_iovec_init(qiov, | |
1525 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); | |
1526 | ||
1527 | // Add the first request to the merged one. If the requests are | |
1528 | // overlapping, drop the last sectors of the first request. | |
1529 | size = (reqs[i].sector - reqs[outidx].sector) << 9; | |
1530 | qemu_iovec_concat(qiov, reqs[outidx].qiov, size); | |
1531 | ||
1532 | // We might need to add some zeros between the two requests | |
1533 | if (reqs[i].sector > oldreq_last) { | |
1534 | size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9; | |
1535 | uint8_t *buf = qemu_blockalign(bs, zero_bytes); | |
1536 | memset(buf, 0, zero_bytes); | |
1537 | qemu_iovec_add(qiov, buf, zero_bytes); | |
1538 | mcb->callbacks[i].free_buf = buf; | |
1539 | } | |
1540 | ||
1541 | // Add the second request | |
1542 | qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size); | |
1543 | ||
1544 | reqs[outidx].nb_sectors += reqs[i].nb_sectors; | |
1545 | reqs[outidx].qiov = qiov; | |
1546 | ||
1547 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; | |
1548 | } else { | |
1549 | outidx++; | |
1550 | reqs[outidx].sector = reqs[i].sector; | |
1551 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; | |
1552 | reqs[outidx].qiov = reqs[i].qiov; | |
1553 | } | |
1554 | } | |
1555 | ||
1556 | return outidx + 1; | |
1557 | } | |
1558 | ||
1559 | /* | |
1560 | * Submit multiple AIO write requests at once. | |
1561 | * | |
1562 | * On success, the function returns 0 and all requests in the reqs array have | |
1563 | * been submitted. In error case this function returns -1, and any of the | |
1564 | * requests may or may not be submitted yet. In particular, this means that the | |
1565 | * callback will be called for some of the requests, for others it won't. The | |
1566 | * caller must check the error field of the BlockRequest to wait for the right | |
1567 | * callbacks (if error != 0, no callback will be called). | |
1568 | * | |
1569 | * The implementation may modify the contents of the reqs array, e.g. to merge | |
1570 | * requests. However, the fields opaque and error are left unmodified as they | |
1571 | * are used to signal failure for a single request to the caller. | |
1572 | */ | |
1573 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) | |
1574 | { | |
1575 | BlockDriverAIOCB *acb; | |
1576 | MultiwriteCB *mcb; | |
1577 | int i; | |
1578 | ||
1579 | if (num_reqs == 0) { | |
1580 | return 0; | |
1581 | } | |
1582 | ||
1583 | // Create MultiwriteCB structure | |
1584 | mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); | |
1585 | mcb->num_requests = 0; | |
1586 | mcb->num_callbacks = num_reqs; | |
1587 | ||
1588 | for (i = 0; i < num_reqs; i++) { | |
1589 | mcb->callbacks[i].cb = reqs[i].cb; | |
1590 | mcb->callbacks[i].opaque = reqs[i].opaque; | |
1591 | } | |
1592 | ||
1593 | // Check for mergable requests | |
1594 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); | |
1595 | ||
1596 | // Run the aio requests | |
1597 | for (i = 0; i < num_reqs; i++) { | |
1598 | acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, | |
1599 | reqs[i].nb_sectors, multiwrite_cb, mcb); | |
1600 | ||
1601 | if (acb == NULL) { | |
1602 | // We can only fail the whole thing if no request has been | |
1603 | // submitted yet. Otherwise we'll wait for the submitted AIOs to | |
1604 | // complete and report the error in the callback. | |
1605 | if (mcb->num_requests == 0) { | |
1606 | reqs[i].error = EIO; | |
1607 | goto fail; | |
1608 | } else { | |
1609 | mcb->error = EIO; | |
1610 | break; | |
1611 | } | |
1612 | } else { | |
1613 | mcb->num_requests++; | |
1614 | } | |
1615 | } | |
1616 | ||
1617 | return 0; | |
1618 | ||
1619 | fail: | |
1620 | free(mcb); | |
1621 | return -1; | |
1622 | } | |
1623 | ||
b2e12bc6 CH |
1624 | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
1625 | BlockDriverCompletionFunc *cb, void *opaque) | |
1626 | { | |
1627 | BlockDriver *drv = bs->drv; | |
1628 | ||
1629 | if (!drv) | |
1630 | return NULL; | |
1631 | ||
1632 | /* | |
1633 | * Note that unlike bdrv_flush the driver is reponsible for flushing a | |
1634 | * backing image if it exists. | |
1635 | */ | |
1636 | return drv->bdrv_aio_flush(bs, cb, opaque); | |
1637 | } | |
1638 | ||
83f64091 | 1639 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
83f64091 | 1640 | { |
6bbff9a0 | 1641 | acb->pool->cancel(acb); |
83f64091 FB |
1642 | } |
1643 | ||
ce1a14dc | 1644 | |
83f64091 FB |
1645 | /**************************************************************/ |
1646 | /* async block device emulation */ | |
1647 | ||
c16b5a2c CH |
1648 | typedef struct BlockDriverAIOCBSync { |
1649 | BlockDriverAIOCB common; | |
1650 | QEMUBH *bh; | |
1651 | int ret; | |
1652 | /* vector translation state */ | |
1653 | QEMUIOVector *qiov; | |
1654 | uint8_t *bounce; | |
1655 | int is_write; | |
1656 | } BlockDriverAIOCBSync; | |
1657 | ||
1658 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) | |
1659 | { | |
1660 | BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb; | |
6a7ad299 | 1661 | qemu_bh_delete(acb->bh); |
36afc451 | 1662 | acb->bh = NULL; |
c16b5a2c CH |
1663 | qemu_aio_release(acb); |
1664 | } | |
1665 | ||
1666 | static AIOPool bdrv_em_aio_pool = { | |
1667 | .aiocb_size = sizeof(BlockDriverAIOCBSync), | |
1668 | .cancel = bdrv_aio_cancel_em, | |
1669 | }; | |
1670 | ||
ce1a14dc | 1671 | static void bdrv_aio_bh_cb(void *opaque) |
83f64091 | 1672 | { |
ce1a14dc | 1673 | BlockDriverAIOCBSync *acb = opaque; |
f141eafe | 1674 | |
f141eafe AL |
1675 | if (!acb->is_write) |
1676 | qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); | |
ceb42de8 | 1677 | qemu_vfree(acb->bounce); |
ce1a14dc | 1678 | acb->common.cb(acb->common.opaque, acb->ret); |
6a7ad299 | 1679 | qemu_bh_delete(acb->bh); |
36afc451 | 1680 | acb->bh = NULL; |
ce1a14dc | 1681 | qemu_aio_release(acb); |
83f64091 | 1682 | } |
beac80cd | 1683 | |
f141eafe AL |
1684 | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
1685 | int64_t sector_num, | |
1686 | QEMUIOVector *qiov, | |
1687 | int nb_sectors, | |
1688 | BlockDriverCompletionFunc *cb, | |
1689 | void *opaque, | |
1690 | int is_write) | |
1691 | ||
83f64091 | 1692 | { |
ce1a14dc | 1693 | BlockDriverAIOCBSync *acb; |
ce1a14dc | 1694 | |
c16b5a2c | 1695 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
f141eafe AL |
1696 | acb->is_write = is_write; |
1697 | acb->qiov = qiov; | |
e268ca52 | 1698 | acb->bounce = qemu_blockalign(bs, qiov->size); |
f141eafe | 1699 | |
ce1a14dc PB |
1700 | if (!acb->bh) |
1701 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
f141eafe AL |
1702 | |
1703 | if (is_write) { | |
1704 | qemu_iovec_to_buffer(acb->qiov, acb->bounce); | |
1705 | acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors); | |
1706 | } else { | |
1707 | acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors); | |
1708 | } | |
1709 | ||
ce1a14dc | 1710 | qemu_bh_schedule(acb->bh); |
f141eafe | 1711 | |
ce1a14dc | 1712 | return &acb->common; |
beac80cd FB |
1713 | } |
1714 | ||
f141eafe AL |
1715 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
1716 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 1717 | BlockDriverCompletionFunc *cb, void *opaque) |
beac80cd | 1718 | { |
f141eafe AL |
1719 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
1720 | } | |
83f64091 | 1721 | |
f141eafe AL |
1722 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
1723 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
1724 | BlockDriverCompletionFunc *cb, void *opaque) | |
1725 | { | |
1726 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); | |
beac80cd | 1727 | } |
beac80cd | 1728 | |
b2e12bc6 CH |
1729 | static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, |
1730 | BlockDriverCompletionFunc *cb, void *opaque) | |
1731 | { | |
1732 | BlockDriverAIOCBSync *acb; | |
1733 | ||
1734 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); | |
1735 | acb->is_write = 1; /* don't bounce in the completion hadler */ | |
1736 | acb->qiov = NULL; | |
1737 | acb->bounce = NULL; | |
1738 | acb->ret = 0; | |
1739 | ||
1740 | if (!acb->bh) | |
1741 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
1742 | ||
1743 | bdrv_flush(bs); | |
1744 | qemu_bh_schedule(acb->bh); | |
1745 | return &acb->common; | |
1746 | } | |
1747 | ||
83f64091 FB |
1748 | /**************************************************************/ |
1749 | /* sync block device emulation */ | |
ea2384d3 | 1750 | |
83f64091 FB |
1751 | static void bdrv_rw_em_cb(void *opaque, int ret) |
1752 | { | |
1753 | *(int *)opaque = ret; | |
ea2384d3 FB |
1754 | } |
1755 | ||
83f64091 FB |
1756 | #define NOT_DONE 0x7fffffff |
1757 | ||
5fafdf24 | 1758 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
83f64091 | 1759 | uint8_t *buf, int nb_sectors) |
7a6cba61 | 1760 | { |
ce1a14dc PB |
1761 | int async_ret; |
1762 | BlockDriverAIOCB *acb; | |
f141eafe AL |
1763 | struct iovec iov; |
1764 | QEMUIOVector qiov; | |
83f64091 | 1765 | |
65d6b3d8 KW |
1766 | async_context_push(); |
1767 | ||
83f64091 | 1768 | async_ret = NOT_DONE; |
3f4cb3d3 | 1769 | iov.iov_base = (void *)buf; |
f141eafe AL |
1770 | iov.iov_len = nb_sectors * 512; |
1771 | qemu_iovec_init_external(&qiov, &iov, 1); | |
1772 | acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors, | |
1773 | bdrv_rw_em_cb, &async_ret); | |
65d6b3d8 KW |
1774 | if (acb == NULL) { |
1775 | async_ret = -1; | |
1776 | goto fail; | |
1777 | } | |
baf35cb9 | 1778 | |
83f64091 FB |
1779 | while (async_ret == NOT_DONE) { |
1780 | qemu_aio_wait(); | |
1781 | } | |
baf35cb9 | 1782 | |
65d6b3d8 KW |
1783 | |
1784 | fail: | |
1785 | async_context_pop(); | |
83f64091 | 1786 | return async_ret; |
7a6cba61 PB |
1787 | } |
1788 | ||
83f64091 FB |
1789 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
1790 | const uint8_t *buf, int nb_sectors) | |
1791 | { | |
ce1a14dc PB |
1792 | int async_ret; |
1793 | BlockDriverAIOCB *acb; | |
f141eafe AL |
1794 | struct iovec iov; |
1795 | QEMUIOVector qiov; | |
83f64091 | 1796 | |
65d6b3d8 KW |
1797 | async_context_push(); |
1798 | ||
83f64091 | 1799 | async_ret = NOT_DONE; |
f141eafe AL |
1800 | iov.iov_base = (void *)buf; |
1801 | iov.iov_len = nb_sectors * 512; | |
1802 | qemu_iovec_init_external(&qiov, &iov, 1); | |
1803 | acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors, | |
1804 | bdrv_rw_em_cb, &async_ret); | |
65d6b3d8 KW |
1805 | if (acb == NULL) { |
1806 | async_ret = -1; | |
1807 | goto fail; | |
1808 | } | |
83f64091 FB |
1809 | while (async_ret == NOT_DONE) { |
1810 | qemu_aio_wait(); | |
1811 | } | |
65d6b3d8 KW |
1812 | |
1813 | fail: | |
1814 | async_context_pop(); | |
83f64091 FB |
1815 | return async_ret; |
1816 | } | |
ea2384d3 FB |
1817 | |
1818 | void bdrv_init(void) | |
1819 | { | |
5efa9d5a | 1820 | module_call_init(MODULE_INIT_BLOCK); |
ea2384d3 | 1821 | } |
ce1a14dc | 1822 | |
eb852011 MA |
1823 | void bdrv_init_with_whitelist(void) |
1824 | { | |
1825 | use_bdrv_whitelist = 1; | |
1826 | bdrv_init(); | |
1827 | } | |
1828 | ||
c16b5a2c CH |
1829 | void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs, |
1830 | BlockDriverCompletionFunc *cb, void *opaque) | |
ce1a14dc | 1831 | { |
ce1a14dc PB |
1832 | BlockDriverAIOCB *acb; |
1833 | ||
6bbff9a0 AL |
1834 | if (pool->free_aiocb) { |
1835 | acb = pool->free_aiocb; | |
1836 | pool->free_aiocb = acb->next; | |
ce1a14dc | 1837 | } else { |
6bbff9a0 AL |
1838 | acb = qemu_mallocz(pool->aiocb_size); |
1839 | acb->pool = pool; | |
ce1a14dc PB |
1840 | } |
1841 | acb->bs = bs; | |
1842 | acb->cb = cb; | |
1843 | acb->opaque = opaque; | |
1844 | return acb; | |
1845 | } | |
1846 | ||
1847 | void qemu_aio_release(void *p) | |
1848 | { | |
6bbff9a0 AL |
1849 | BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; |
1850 | AIOPool *pool = acb->pool; | |
1851 | acb->next = pool->free_aiocb; | |
1852 | pool->free_aiocb = acb; | |
ce1a14dc | 1853 | } |
19cb3738 FB |
1854 | |
1855 | /**************************************************************/ | |
1856 | /* removable device support */ | |
1857 | ||
1858 | /** | |
1859 | * Return TRUE if the media is present | |
1860 | */ | |
1861 | int bdrv_is_inserted(BlockDriverState *bs) | |
1862 | { | |
1863 | BlockDriver *drv = bs->drv; | |
1864 | int ret; | |
1865 | if (!drv) | |
1866 | return 0; | |
1867 | if (!drv->bdrv_is_inserted) | |
1868 | return 1; | |
1869 | ret = drv->bdrv_is_inserted(bs); | |
1870 | return ret; | |
1871 | } | |
1872 | ||
1873 | /** | |
1874 | * Return TRUE if the media changed since the last call to this | |
5fafdf24 | 1875 | * function. It is currently only used for floppy disks |
19cb3738 FB |
1876 | */ |
1877 | int bdrv_media_changed(BlockDriverState *bs) | |
1878 | { | |
1879 | BlockDriver *drv = bs->drv; | |
1880 | int ret; | |
1881 | ||
1882 | if (!drv || !drv->bdrv_media_changed) | |
1883 | ret = -ENOTSUP; | |
1884 | else | |
1885 | ret = drv->bdrv_media_changed(bs); | |
1886 | if (ret == -ENOTSUP) | |
1887 | ret = bs->media_changed; | |
1888 | bs->media_changed = 0; | |
1889 | return ret; | |
1890 | } | |
1891 | ||
1892 | /** | |
1893 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
1894 | */ | |
aea2a33c | 1895 | int bdrv_eject(BlockDriverState *bs, int eject_flag) |
19cb3738 FB |
1896 | { |
1897 | BlockDriver *drv = bs->drv; | |
1898 | int ret; | |
1899 | ||
aea2a33c MM |
1900 | if (bs->locked) { |
1901 | return -EBUSY; | |
1902 | } | |
1903 | ||
19cb3738 FB |
1904 | if (!drv || !drv->bdrv_eject) { |
1905 | ret = -ENOTSUP; | |
1906 | } else { | |
1907 | ret = drv->bdrv_eject(bs, eject_flag); | |
1908 | } | |
1909 | if (ret == -ENOTSUP) { | |
1910 | if (eject_flag) | |
1911 | bdrv_close(bs); | |
aea2a33c | 1912 | ret = 0; |
19cb3738 | 1913 | } |
aea2a33c MM |
1914 | |
1915 | return ret; | |
19cb3738 FB |
1916 | } |
1917 | ||
1918 | int bdrv_is_locked(BlockDriverState *bs) | |
1919 | { | |
1920 | return bs->locked; | |
1921 | } | |
1922 | ||
1923 | /** | |
1924 | * Lock or unlock the media (if it is locked, the user won't be able | |
1925 | * to eject it manually). | |
1926 | */ | |
1927 | void bdrv_set_locked(BlockDriverState *bs, int locked) | |
1928 | { | |
1929 | BlockDriver *drv = bs->drv; | |
1930 | ||
1931 | bs->locked = locked; | |
1932 | if (drv && drv->bdrv_set_locked) { | |
1933 | drv->bdrv_set_locked(bs, locked); | |
1934 | } | |
1935 | } | |
985a03b0 TS |
1936 | |
1937 | /* needed for generic scsi interface */ | |
1938 | ||
1939 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
1940 | { | |
1941 | BlockDriver *drv = bs->drv; | |
1942 | ||
1943 | if (drv && drv->bdrv_ioctl) | |
1944 | return drv->bdrv_ioctl(bs, req, buf); | |
1945 | return -ENOTSUP; | |
1946 | } | |
7d780669 | 1947 | |
221f715d AL |
1948 | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
1949 | unsigned long int req, void *buf, | |
1950 | BlockDriverCompletionFunc *cb, void *opaque) | |
7d780669 | 1951 | { |
221f715d | 1952 | BlockDriver *drv = bs->drv; |
7d780669 | 1953 | |
221f715d AL |
1954 | if (drv && drv->bdrv_aio_ioctl) |
1955 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); | |
1956 | return NULL; | |
7d780669 | 1957 | } |
e268ca52 | 1958 | |
7cd1e32a | 1959 | |
1960 | ||
e268ca52 AL |
1961 | void *qemu_blockalign(BlockDriverState *bs, size_t size) |
1962 | { | |
1963 | return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); | |
1964 | } | |
7cd1e32a | 1965 | |
1966 | void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable) | |
1967 | { | |
1968 | int64_t bitmap_size; | |
1969 | if(enable) { | |
1970 | if(bs->dirty_tracking == 0) { | |
1971 | int64_t i; | |
1972 | uint8_t test; | |
1973 | bitmap_size = (bdrv_getlength(bs) >> SECTOR_BITS); | |
1974 | bitmap_size /= SECTORS_PER_DIRTY_CHUNK; | |
1975 | bitmap_size++; | |
1976 | ||
1977 | bs->dirty_bitmap = qemu_mallocz(bitmap_size); | |
1978 | ||
1979 | bs->dirty_tracking = enable; | |
1980 | for(i = 0; i < bitmap_size; i++) test = bs->dirty_bitmap[i]; | |
1981 | } | |
1982 | } else { | |
1983 | if(bs->dirty_tracking != 0) { | |
1984 | qemu_free(bs->dirty_bitmap); | |
1985 | bs->dirty_tracking = enable; | |
1986 | } | |
1987 | } | |
1988 | } | |
1989 | ||
1990 | int bdrv_get_dirty(BlockDriverState *bs, int64_t sector) | |
1991 | { | |
1992 | int64_t chunk = sector / (int64_t)SECTORS_PER_DIRTY_CHUNK; | |
1993 | ||
1994 | if(bs->dirty_bitmap != NULL && | |
1995 | (sector << SECTOR_BITS) <= bdrv_getlength(bs)) { | |
1996 | return bs->dirty_bitmap[chunk]; | |
1997 | } else { | |
1998 | return 0; | |
1999 | } | |
2000 | } | |
2001 | ||
2002 | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, | |
2003 | int nr_sectors) | |
2004 | { | |
2005 | set_dirty_bitmap(bs, cur_sector, nr_sectors, 0); | |
2006 | } | |
2007 | ||
2008 | int bdrv_get_sectors_per_chunk(void) | |
2009 | { | |
2010 | /* size must be 2^x */ | |
2011 | return SECTORS_PER_DIRTY_CHUNK; | |
2012 | } |