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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) | |
46 | ||
f141eafe AL |
47 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
48 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
c87c0672 | 49 | BlockDriverCompletionFunc *cb, void *opaque); |
f141eafe AL |
50 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
51 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 52 | BlockDriverCompletionFunc *cb, void *opaque); |
b2e12bc6 CH |
53 | static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, |
54 | BlockDriverCompletionFunc *cb, void *opaque); | |
5fafdf24 | 55 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
83f64091 FB |
56 | uint8_t *buf, int nb_sectors); |
57 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, | |
58 | const uint8_t *buf, int nb_sectors); | |
ec530c81 | 59 | |
7ee930d0 BS |
60 | BlockDriverState *bdrv_first; |
61 | ||
ea2384d3 FB |
62 | static BlockDriver *first_drv; |
63 | ||
eb852011 MA |
64 | /* If non-zero, use only whitelisted block drivers */ |
65 | static int use_bdrv_whitelist; | |
66 | ||
83f64091 | 67 | int path_is_absolute(const char *path) |
3b0d4f61 | 68 | { |
83f64091 | 69 | const char *p; |
21664424 FB |
70 | #ifdef _WIN32 |
71 | /* specific case for names like: "\\.\d:" */ | |
72 | if (*path == '/' || *path == '\\') | |
73 | return 1; | |
74 | #endif | |
83f64091 FB |
75 | p = strchr(path, ':'); |
76 | if (p) | |
77 | p++; | |
78 | else | |
79 | p = path; | |
3b9f94e1 FB |
80 | #ifdef _WIN32 |
81 | return (*p == '/' || *p == '\\'); | |
82 | #else | |
83 | return (*p == '/'); | |
84 | #endif | |
3b0d4f61 FB |
85 | } |
86 | ||
83f64091 FB |
87 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
88 | path to it by considering it is relative to base_path. URL are | |
89 | supported. */ | |
90 | void path_combine(char *dest, int dest_size, | |
91 | const char *base_path, | |
92 | const char *filename) | |
3b0d4f61 | 93 | { |
83f64091 FB |
94 | const char *p, *p1; |
95 | int len; | |
96 | ||
97 | if (dest_size <= 0) | |
98 | return; | |
99 | if (path_is_absolute(filename)) { | |
100 | pstrcpy(dest, dest_size, filename); | |
101 | } else { | |
102 | p = strchr(base_path, ':'); | |
103 | if (p) | |
104 | p++; | |
105 | else | |
106 | p = base_path; | |
3b9f94e1 FB |
107 | p1 = strrchr(base_path, '/'); |
108 | #ifdef _WIN32 | |
109 | { | |
110 | const char *p2; | |
111 | p2 = strrchr(base_path, '\\'); | |
112 | if (!p1 || p2 > p1) | |
113 | p1 = p2; | |
114 | } | |
115 | #endif | |
83f64091 FB |
116 | if (p1) |
117 | p1++; | |
118 | else | |
119 | p1 = base_path; | |
120 | if (p1 > p) | |
121 | p = p1; | |
122 | len = p - base_path; | |
123 | if (len > dest_size - 1) | |
124 | len = dest_size - 1; | |
125 | memcpy(dest, base_path, len); | |
126 | dest[len] = '\0'; | |
127 | pstrcat(dest, dest_size, filename); | |
3b0d4f61 | 128 | } |
3b0d4f61 FB |
129 | } |
130 | ||
5efa9d5a | 131 | void bdrv_register(BlockDriver *bdrv) |
ea2384d3 | 132 | { |
f141eafe | 133 | if (!bdrv->bdrv_aio_readv) { |
83f64091 | 134 | /* add AIO emulation layer */ |
f141eafe AL |
135 | bdrv->bdrv_aio_readv = bdrv_aio_readv_em; |
136 | bdrv->bdrv_aio_writev = bdrv_aio_writev_em; | |
eda578e5 | 137 | } else if (!bdrv->bdrv_read) { |
83f64091 FB |
138 | /* add synchronous IO emulation layer */ |
139 | bdrv->bdrv_read = bdrv_read_em; | |
140 | bdrv->bdrv_write = bdrv_write_em; | |
141 | } | |
b2e12bc6 CH |
142 | |
143 | if (!bdrv->bdrv_aio_flush) | |
144 | bdrv->bdrv_aio_flush = bdrv_aio_flush_em; | |
145 | ||
ea2384d3 FB |
146 | bdrv->next = first_drv; |
147 | first_drv = bdrv; | |
148 | } | |
b338082b FB |
149 | |
150 | /* create a new block device (by default it is empty) */ | |
151 | BlockDriverState *bdrv_new(const char *device_name) | |
152 | { | |
153 | BlockDriverState **pbs, *bs; | |
154 | ||
155 | bs = qemu_mallocz(sizeof(BlockDriverState)); | |
b338082b | 156 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); |
ea2384d3 FB |
157 | if (device_name[0] != '\0') { |
158 | /* insert at the end */ | |
159 | pbs = &bdrv_first; | |
160 | while (*pbs != NULL) | |
161 | pbs = &(*pbs)->next; | |
162 | *pbs = bs; | |
163 | } | |
b338082b FB |
164 | return bs; |
165 | } | |
166 | ||
ea2384d3 FB |
167 | BlockDriver *bdrv_find_format(const char *format_name) |
168 | { | |
169 | BlockDriver *drv1; | |
170 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { | |
171 | if (!strcmp(drv1->format_name, format_name)) | |
172 | return drv1; | |
173 | } | |
174 | return NULL; | |
175 | } | |
176 | ||
eb852011 MA |
177 | static int bdrv_is_whitelisted(BlockDriver *drv) |
178 | { | |
179 | static const char *whitelist[] = { | |
180 | CONFIG_BDRV_WHITELIST | |
181 | }; | |
182 | const char **p; | |
183 | ||
184 | if (!whitelist[0]) | |
185 | return 1; /* no whitelist, anything goes */ | |
186 | ||
187 | for (p = whitelist; *p; p++) { | |
188 | if (!strcmp(drv->format_name, *p)) { | |
189 | return 1; | |
190 | } | |
191 | } | |
192 | return 0; | |
193 | } | |
194 | ||
195 | BlockDriver *bdrv_find_whitelisted_format(const char *format_name) | |
196 | { | |
197 | BlockDriver *drv = bdrv_find_format(format_name); | |
198 | return drv && bdrv_is_whitelisted(drv) ? drv : NULL; | |
199 | } | |
200 | ||
0e7e1989 KW |
201 | int bdrv_create(BlockDriver *drv, const char* filename, |
202 | QEMUOptionParameter *options) | |
ea2384d3 FB |
203 | { |
204 | if (!drv->bdrv_create) | |
205 | return -ENOTSUP; | |
0e7e1989 KW |
206 | |
207 | return drv->bdrv_create(filename, options); | |
ea2384d3 FB |
208 | } |
209 | ||
d5249393 | 210 | #ifdef _WIN32 |
95389c86 | 211 | void get_tmp_filename(char *filename, int size) |
d5249393 | 212 | { |
3b9f94e1 | 213 | char temp_dir[MAX_PATH]; |
3b46e624 | 214 | |
3b9f94e1 FB |
215 | GetTempPath(MAX_PATH, temp_dir); |
216 | GetTempFileName(temp_dir, "qem", 0, filename); | |
d5249393 FB |
217 | } |
218 | #else | |
95389c86 | 219 | void get_tmp_filename(char *filename, int size) |
fc01f7e7 | 220 | { |
67b915a5 | 221 | int fd; |
7ccfb2eb | 222 | const char *tmpdir; |
d5249393 | 223 | /* XXX: race condition possible */ |
0badc1ee AJ |
224 | tmpdir = getenv("TMPDIR"); |
225 | if (!tmpdir) | |
226 | tmpdir = "/tmp"; | |
227 | snprintf(filename, size, "%s/vl.XXXXXX", tmpdir); | |
ea2384d3 FB |
228 | fd = mkstemp(filename); |
229 | close(fd); | |
230 | } | |
d5249393 | 231 | #endif |
fc01f7e7 | 232 | |
19cb3738 | 233 | #ifdef _WIN32 |
f45512fe FB |
234 | static int is_windows_drive_prefix(const char *filename) |
235 | { | |
236 | return (((filename[0] >= 'a' && filename[0] <= 'z') || | |
237 | (filename[0] >= 'A' && filename[0] <= 'Z')) && | |
238 | filename[1] == ':'); | |
239 | } | |
3b46e624 | 240 | |
508c7cb3 | 241 | int is_windows_drive(const char *filename) |
19cb3738 | 242 | { |
5fafdf24 | 243 | if (is_windows_drive_prefix(filename) && |
f45512fe | 244 | filename[2] == '\0') |
19cb3738 FB |
245 | return 1; |
246 | if (strstart(filename, "\\\\.\\", NULL) || | |
247 | strstart(filename, "//./", NULL)) | |
248 | return 1; | |
249 | return 0; | |
250 | } | |
251 | #endif | |
252 | ||
83f64091 FB |
253 | static BlockDriver *find_protocol(const char *filename) |
254 | { | |
255 | BlockDriver *drv1; | |
256 | char protocol[128]; | |
1cec71e3 | 257 | int len; |
83f64091 | 258 | const char *p; |
19cb3738 FB |
259 | |
260 | #ifdef _WIN32 | |
f45512fe FB |
261 | if (is_windows_drive(filename) || |
262 | is_windows_drive_prefix(filename)) | |
5efa9d5a | 263 | return bdrv_find_format("raw"); |
19cb3738 | 264 | #endif |
1cec71e3 AL |
265 | p = strchr(filename, ':'); |
266 | if (!p) | |
5efa9d5a | 267 | return bdrv_find_format("raw"); |
1cec71e3 AL |
268 | len = p - filename; |
269 | if (len > sizeof(protocol) - 1) | |
270 | len = sizeof(protocol) - 1; | |
271 | memcpy(protocol, filename, len); | |
272 | protocol[len] = '\0'; | |
83f64091 | 273 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
5fafdf24 | 274 | if (drv1->protocol_name && |
83f64091 FB |
275 | !strcmp(drv1->protocol_name, protocol)) |
276 | return drv1; | |
277 | } | |
278 | return NULL; | |
279 | } | |
280 | ||
f3a5d3f8 CH |
281 | /* |
282 | * Detect host devices. By convention, /dev/cdrom[N] is always | |
283 | * recognized as a host CDROM. | |
284 | */ | |
f3a5d3f8 CH |
285 | static BlockDriver *find_hdev_driver(const char *filename) |
286 | { | |
508c7cb3 CH |
287 | int score_max = 0, score; |
288 | BlockDriver *drv = NULL, *d; | |
f3a5d3f8 | 289 | |
508c7cb3 CH |
290 | for (d = first_drv; d; d = d->next) { |
291 | if (d->bdrv_probe_device) { | |
292 | score = d->bdrv_probe_device(filename); | |
293 | if (score > score_max) { | |
294 | score_max = score; | |
295 | drv = d; | |
296 | } | |
297 | } | |
19cb3738 | 298 | } |
f3a5d3f8 | 299 | |
508c7cb3 | 300 | return drv; |
f3a5d3f8 | 301 | } |
3b46e624 | 302 | |
f3a5d3f8 CH |
303 | static BlockDriver *find_image_format(const char *filename) |
304 | { | |
305 | int ret, score, score_max; | |
306 | BlockDriver *drv1, *drv; | |
307 | uint8_t buf[2048]; | |
308 | BlockDriverState *bs; | |
309 | ||
83f64091 | 310 | drv = find_protocol(filename); |
19cb3738 | 311 | /* no need to test disk image formats for vvfat */ |
c833ab73 | 312 | if (drv && strcmp(drv->format_name, "vvfat") == 0) |
83f64091 | 313 | return drv; |
19cb3738 | 314 | |
83f64091 FB |
315 | ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY); |
316 | if (ret < 0) | |
317 | return NULL; | |
318 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); | |
319 | bdrv_delete(bs); | |
320 | if (ret < 0) { | |
321 | return NULL; | |
322 | } | |
323 | ||
ea2384d3 FB |
324 | score_max = 0; |
325 | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { | |
83f64091 FB |
326 | if (drv1->bdrv_probe) { |
327 | score = drv1->bdrv_probe(buf, ret, filename); | |
328 | if (score > score_max) { | |
329 | score_max = score; | |
330 | drv = drv1; | |
331 | } | |
0849bf08 | 332 | } |
fc01f7e7 | 333 | } |
ea2384d3 FB |
334 | return drv; |
335 | } | |
336 | ||
83f64091 | 337 | int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
ea2384d3 | 338 | { |
83f64091 FB |
339 | BlockDriverState *bs; |
340 | int ret; | |
341 | ||
342 | bs = bdrv_new(""); | |
83f64091 FB |
343 | ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL); |
344 | if (ret < 0) { | |
345 | bdrv_delete(bs); | |
346 | return ret; | |
3b0d4f61 | 347 | } |
71d0770c | 348 | bs->growable = 1; |
83f64091 FB |
349 | *pbs = bs; |
350 | return 0; | |
351 | } | |
352 | ||
353 | int bdrv_open(BlockDriverState *bs, const char *filename, int flags) | |
354 | { | |
355 | return bdrv_open2(bs, filename, flags, NULL); | |
ea2384d3 FB |
356 | } |
357 | ||
83f64091 | 358 | int bdrv_open2(BlockDriverState *bs, const char *filename, int flags, |
ea2384d3 FB |
359 | BlockDriver *drv) |
360 | { | |
59f2689d | 361 | int ret, open_flags, try_rw; |
eb5c851f TS |
362 | char tmp_filename[PATH_MAX]; |
363 | char backing_filename[PATH_MAX]; | |
3b46e624 | 364 | |
ea2384d3 FB |
365 | bs->is_temporary = 0; |
366 | bs->encrypted = 0; | |
c0f4ce77 | 367 | bs->valid_key = 0; |
e268ca52 AL |
368 | /* buffer_alignment defaulted to 512, drivers can change this value */ |
369 | bs->buffer_alignment = 512; | |
712e7874 | 370 | |
83f64091 | 371 | if (flags & BDRV_O_SNAPSHOT) { |
ea2384d3 FB |
372 | BlockDriverState *bs1; |
373 | int64_t total_size; | |
7c96d46e | 374 | int is_protocol = 0; |
91a073a9 KW |
375 | BlockDriver *bdrv_qcow2; |
376 | QEMUOptionParameter *options; | |
3b46e624 | 377 | |
ea2384d3 FB |
378 | /* if snapshot, we create a temporary backing file and open it |
379 | instead of opening 'filename' directly */ | |
33e3963e | 380 | |
ea2384d3 FB |
381 | /* if there is a backing file, use it */ |
382 | bs1 = bdrv_new(""); | |
5eb45639 | 383 | ret = bdrv_open2(bs1, filename, 0, drv); |
51d7c00c | 384 | if (ret < 0) { |
ea2384d3 | 385 | bdrv_delete(bs1); |
51d7c00c | 386 | return ret; |
ea2384d3 | 387 | } |
83f64091 | 388 | total_size = bdrv_getlength(bs1) >> SECTOR_BITS; |
7c96d46e AL |
389 | |
390 | if (bs1->drv && bs1->drv->protocol_name) | |
391 | is_protocol = 1; | |
392 | ||
ea2384d3 | 393 | bdrv_delete(bs1); |
3b46e624 | 394 | |
ea2384d3 | 395 | get_tmp_filename(tmp_filename, sizeof(tmp_filename)); |
7c96d46e AL |
396 | |
397 | /* Real path is meaningless for protocols */ | |
398 | if (is_protocol) | |
399 | snprintf(backing_filename, sizeof(backing_filename), | |
400 | "%s", filename); | |
401 | else | |
402 | realpath(filename, backing_filename); | |
403 | ||
91a073a9 KW |
404 | bdrv_qcow2 = bdrv_find_format("qcow2"); |
405 | options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); | |
406 | ||
407 | set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size * 512); | |
408 | set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); | |
409 | if (drv) { | |
410 | set_option_parameter(options, BLOCK_OPT_BACKING_FMT, | |
411 | drv->format_name); | |
412 | } | |
413 | ||
414 | ret = bdrv_create(bdrv_qcow2, tmp_filename, options); | |
51d7c00c AL |
415 | if (ret < 0) { |
416 | return ret; | |
ea2384d3 | 417 | } |
91a073a9 | 418 | |
ea2384d3 | 419 | filename = tmp_filename; |
91a073a9 | 420 | drv = bdrv_qcow2; |
ea2384d3 FB |
421 | bs->is_temporary = 1; |
422 | } | |
712e7874 | 423 | |
ea2384d3 | 424 | pstrcpy(bs->filename, sizeof(bs->filename), filename); |
83f64091 FB |
425 | if (flags & BDRV_O_FILE) { |
426 | drv = find_protocol(filename); | |
51d7c00c | 427 | } else if (!drv) { |
f3a5d3f8 CH |
428 | drv = find_hdev_driver(filename); |
429 | if (!drv) { | |
430 | drv = find_image_format(filename); | |
431 | } | |
51d7c00c AL |
432 | } |
433 | if (!drv) { | |
434 | ret = -ENOENT; | |
435 | goto unlink_and_fail; | |
ea2384d3 FB |
436 | } |
437 | bs->drv = drv; | |
438 | bs->opaque = qemu_mallocz(drv->instance_size); | |
e900a7b7 CH |
439 | |
440 | /* | |
441 | * Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a | |
442 | * write cache to the guest. We do need the fdatasync to flush | |
443 | * out transactions for block allocations, and we maybe have a | |
444 | * volatile write cache in our backing device to deal with. | |
445 | */ | |
446 | if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE)) | |
447 | bs->enable_write_cache = 1; | |
448 | ||
83f64091 FB |
449 | /* Note: for compatibility, we open disk image files as RDWR, and |
450 | RDONLY as fallback */ | |
59f2689d | 451 | try_rw = !bs->read_only || bs->is_temporary; |
83f64091 | 452 | if (!(flags & BDRV_O_FILE)) |
59f2689d NS |
453 | open_flags = (try_rw ? BDRV_O_RDWR : 0) | |
454 | (flags & (BDRV_O_CACHE_MASK|BDRV_O_NATIVE_AIO)); | |
83f64091 FB |
455 | else |
456 | open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT); | |
eb852011 MA |
457 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) |
458 | ret = -ENOTSUP; | |
459 | else | |
460 | ret = drv->bdrv_open(bs, filename, open_flags); | |
a0a83536 | 461 | if ((ret == -EACCES || ret == -EPERM) && !(flags & BDRV_O_FILE)) { |
1cec71e3 | 462 | ret = drv->bdrv_open(bs, filename, open_flags & ~BDRV_O_RDWR); |
83f64091 FB |
463 | bs->read_only = 1; |
464 | } | |
ea2384d3 FB |
465 | if (ret < 0) { |
466 | qemu_free(bs->opaque); | |
6b21b973 FB |
467 | bs->opaque = NULL; |
468 | bs->drv = NULL; | |
51d7c00c AL |
469 | unlink_and_fail: |
470 | if (bs->is_temporary) | |
471 | unlink(filename); | |
83f64091 | 472 | return ret; |
33e3963e | 473 | } |
d15a771d FB |
474 | if (drv->bdrv_getlength) { |
475 | bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; | |
476 | } | |
67b915a5 | 477 | #ifndef _WIN32 |
ea2384d3 FB |
478 | if (bs->is_temporary) { |
479 | unlink(filename); | |
480 | } | |
481 | #endif | |
83f64091 | 482 | if (bs->backing_file[0] != '\0') { |
ea2384d3 | 483 | /* if there is a backing file, use it */ |
5eb45639 | 484 | BlockDriver *back_drv = NULL; |
ea2384d3 | 485 | bs->backing_hd = bdrv_new(""); |
59f2689d NS |
486 | /* pass on read_only property to the backing_hd */ |
487 | bs->backing_hd->read_only = bs->read_only; | |
83f64091 FB |
488 | path_combine(backing_filename, sizeof(backing_filename), |
489 | filename, bs->backing_file); | |
5eb45639 AL |
490 | if (bs->backing_format[0] != '\0') |
491 | back_drv = bdrv_find_format(bs->backing_format); | |
492 | ret = bdrv_open2(bs->backing_hd, backing_filename, open_flags, | |
493 | back_drv); | |
51d7c00c AL |
494 | if (ret < 0) { |
495 | bdrv_close(bs); | |
496 | return ret; | |
497 | } | |
33e3963e FB |
498 | } |
499 | ||
bb5fc20f AL |
500 | if (!bdrv_key_required(bs)) { |
501 | /* call the change callback */ | |
502 | bs->media_changed = 1; | |
503 | if (bs->change_cb) | |
504 | bs->change_cb(bs->change_opaque); | |
505 | } | |
b338082b | 506 | return 0; |
fc01f7e7 FB |
507 | } |
508 | ||
509 | void bdrv_close(BlockDriverState *bs) | |
510 | { | |
19cb3738 | 511 | if (bs->drv) { |
ea2384d3 FB |
512 | if (bs->backing_hd) |
513 | bdrv_delete(bs->backing_hd); | |
514 | bs->drv->bdrv_close(bs); | |
515 | qemu_free(bs->opaque); | |
516 | #ifdef _WIN32 | |
517 | if (bs->is_temporary) { | |
518 | unlink(bs->filename); | |
519 | } | |
67b915a5 | 520 | #endif |
ea2384d3 FB |
521 | bs->opaque = NULL; |
522 | bs->drv = NULL; | |
b338082b FB |
523 | |
524 | /* call the change callback */ | |
19cb3738 | 525 | bs->media_changed = 1; |
b338082b FB |
526 | if (bs->change_cb) |
527 | bs->change_cb(bs->change_opaque); | |
528 | } | |
529 | } | |
530 | ||
531 | void bdrv_delete(BlockDriverState *bs) | |
532 | { | |
34c6f050 AJ |
533 | BlockDriverState **pbs; |
534 | ||
535 | pbs = &bdrv_first; | |
536 | while (*pbs != bs && *pbs != NULL) | |
537 | pbs = &(*pbs)->next; | |
538 | if (*pbs == bs) | |
539 | *pbs = bs->next; | |
540 | ||
b338082b FB |
541 | bdrv_close(bs); |
542 | qemu_free(bs); | |
fc01f7e7 FB |
543 | } |
544 | ||
e97fc193 AL |
545 | /* |
546 | * Run consistency checks on an image | |
547 | * | |
548 | * Returns the number of errors or -errno when an internal error occurs | |
549 | */ | |
550 | int bdrv_check(BlockDriverState *bs) | |
551 | { | |
552 | if (bs->drv->bdrv_check == NULL) { | |
553 | return -ENOTSUP; | |
554 | } | |
555 | ||
556 | return bs->drv->bdrv_check(bs); | |
557 | } | |
558 | ||
33e3963e FB |
559 | /* commit COW file into the raw image */ |
560 | int bdrv_commit(BlockDriverState *bs) | |
561 | { | |
19cb3738 | 562 | BlockDriver *drv = bs->drv; |
83f64091 | 563 | int64_t i, total_sectors; |
ea2384d3 FB |
564 | int n, j; |
565 | unsigned char sector[512]; | |
33e3963e | 566 | |
19cb3738 FB |
567 | if (!drv) |
568 | return -ENOMEDIUM; | |
33e3963e FB |
569 | |
570 | if (bs->read_only) { | |
ea2384d3 | 571 | return -EACCES; |
33e3963e FB |
572 | } |
573 | ||
ea2384d3 FB |
574 | if (!bs->backing_hd) { |
575 | return -ENOTSUP; | |
576 | } | |
33e3963e | 577 | |
83f64091 FB |
578 | total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
579 | for (i = 0; i < total_sectors;) { | |
19cb3738 | 580 | if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { |
ea2384d3 FB |
581 | for(j = 0; j < n; j++) { |
582 | if (bdrv_read(bs, i, sector, 1) != 0) { | |
583 | return -EIO; | |
584 | } | |
585 | ||
586 | if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { | |
587 | return -EIO; | |
588 | } | |
589 | i++; | |
33e3963e | 590 | } |
ea2384d3 FB |
591 | } else { |
592 | i += n; | |
593 | } | |
33e3963e | 594 | } |
95389c86 | 595 | |
19cb3738 FB |
596 | if (drv->bdrv_make_empty) |
597 | return drv->bdrv_make_empty(bs); | |
95389c86 | 598 | |
33e3963e FB |
599 | return 0; |
600 | } | |
601 | ||
71d0770c AL |
602 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
603 | size_t size) | |
604 | { | |
605 | int64_t len; | |
606 | ||
607 | if (!bdrv_is_inserted(bs)) | |
608 | return -ENOMEDIUM; | |
609 | ||
610 | if (bs->growable) | |
611 | return 0; | |
612 | ||
613 | len = bdrv_getlength(bs); | |
614 | ||
fbb7b4e0 KW |
615 | if (offset < 0) |
616 | return -EIO; | |
617 | ||
618 | if ((offset > len) || (len - offset < size)) | |
71d0770c AL |
619 | return -EIO; |
620 | ||
621 | return 0; | |
622 | } | |
623 | ||
624 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, | |
625 | int nb_sectors) | |
626 | { | |
999dec57 | 627 | return bdrv_check_byte_request(bs, sector_num * 512, nb_sectors * 512); |
71d0770c AL |
628 | } |
629 | ||
19cb3738 | 630 | /* return < 0 if error. See bdrv_write() for the return codes */ |
5fafdf24 | 631 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
632 | uint8_t *buf, int nb_sectors) |
633 | { | |
ea2384d3 FB |
634 | BlockDriver *drv = bs->drv; |
635 | ||
19cb3738 FB |
636 | if (!drv) |
637 | return -ENOMEDIUM; | |
71d0770c AL |
638 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
639 | return -EIO; | |
b338082b | 640 | |
eda578e5 | 641 | return drv->bdrv_read(bs, sector_num, buf, nb_sectors); |
fc01f7e7 FB |
642 | } |
643 | ||
5fafdf24 | 644 | /* Return < 0 if error. Important errors are: |
19cb3738 FB |
645 | -EIO generic I/O error (may happen for all errors) |
646 | -ENOMEDIUM No media inserted. | |
647 | -EINVAL Invalid sector number or nb_sectors | |
648 | -EACCES Trying to write a read-only device | |
649 | */ | |
5fafdf24 | 650 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
651 | const uint8_t *buf, int nb_sectors) |
652 | { | |
83f64091 | 653 | BlockDriver *drv = bs->drv; |
19cb3738 FB |
654 | if (!bs->drv) |
655 | return -ENOMEDIUM; | |
0849bf08 | 656 | if (bs->read_only) |
19cb3738 | 657 | return -EACCES; |
71d0770c AL |
658 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
659 | return -EIO; | |
660 | ||
42fb2807 | 661 | return drv->bdrv_write(bs, sector_num, buf, nb_sectors); |
83f64091 FB |
662 | } |
663 | ||
eda578e5 AL |
664 | int bdrv_pread(BlockDriverState *bs, int64_t offset, |
665 | void *buf, int count1) | |
83f64091 | 666 | { |
83f64091 FB |
667 | uint8_t tmp_buf[SECTOR_SIZE]; |
668 | int len, nb_sectors, count; | |
669 | int64_t sector_num; | |
670 | ||
671 | count = count1; | |
672 | /* first read to align to sector start */ | |
673 | len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1); | |
674 | if (len > count) | |
675 | len = count; | |
676 | sector_num = offset >> SECTOR_BITS; | |
677 | if (len > 0) { | |
678 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
679 | return -EIO; | |
680 | memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len); | |
681 | count -= len; | |
682 | if (count == 0) | |
683 | return count1; | |
684 | sector_num++; | |
685 | buf += len; | |
686 | } | |
687 | ||
688 | /* read the sectors "in place" */ | |
689 | nb_sectors = count >> SECTOR_BITS; | |
690 | if (nb_sectors > 0) { | |
691 | if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0) | |
692 | return -EIO; | |
693 | sector_num += nb_sectors; | |
694 | len = nb_sectors << SECTOR_BITS; | |
695 | buf += len; | |
696 | count -= len; | |
697 | } | |
698 | ||
699 | /* add data from the last sector */ | |
700 | if (count > 0) { | |
701 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
702 | return -EIO; | |
703 | memcpy(buf, tmp_buf, count); | |
704 | } | |
705 | return count1; | |
706 | } | |
707 | ||
eda578e5 AL |
708 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, |
709 | const void *buf, int count1) | |
83f64091 | 710 | { |
83f64091 FB |
711 | uint8_t tmp_buf[SECTOR_SIZE]; |
712 | int len, nb_sectors, count; | |
713 | int64_t sector_num; | |
714 | ||
715 | count = count1; | |
716 | /* first write to align to sector start */ | |
717 | len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1); | |
718 | if (len > count) | |
719 | len = count; | |
720 | sector_num = offset >> SECTOR_BITS; | |
721 | if (len > 0) { | |
722 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
723 | return -EIO; | |
724 | memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len); | |
725 | if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) | |
726 | return -EIO; | |
727 | count -= len; | |
728 | if (count == 0) | |
729 | return count1; | |
730 | sector_num++; | |
731 | buf += len; | |
732 | } | |
733 | ||
734 | /* write the sectors "in place" */ | |
735 | nb_sectors = count >> SECTOR_BITS; | |
736 | if (nb_sectors > 0) { | |
737 | if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0) | |
738 | return -EIO; | |
739 | sector_num += nb_sectors; | |
740 | len = nb_sectors << SECTOR_BITS; | |
741 | buf += len; | |
742 | count -= len; | |
743 | } | |
744 | ||
745 | /* add data from the last sector */ | |
746 | if (count > 0) { | |
747 | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) | |
748 | return -EIO; | |
749 | memcpy(tmp_buf, buf, count); | |
750 | if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) | |
751 | return -EIO; | |
752 | } | |
753 | return count1; | |
754 | } | |
83f64091 | 755 | |
83f64091 FB |
756 | /** |
757 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
758 | */ | |
759 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
760 | { | |
761 | BlockDriver *drv = bs->drv; | |
762 | if (!drv) | |
19cb3738 | 763 | return -ENOMEDIUM; |
83f64091 FB |
764 | if (!drv->bdrv_truncate) |
765 | return -ENOTSUP; | |
59f2689d NS |
766 | if (bs->read_only) |
767 | return -EACCES; | |
83f64091 FB |
768 | return drv->bdrv_truncate(bs, offset); |
769 | } | |
770 | ||
771 | /** | |
772 | * Length of a file in bytes. Return < 0 if error or unknown. | |
773 | */ | |
774 | int64_t bdrv_getlength(BlockDriverState *bs) | |
775 | { | |
776 | BlockDriver *drv = bs->drv; | |
777 | if (!drv) | |
19cb3738 | 778 | return -ENOMEDIUM; |
83f64091 FB |
779 | if (!drv->bdrv_getlength) { |
780 | /* legacy mode */ | |
781 | return bs->total_sectors * SECTOR_SIZE; | |
782 | } | |
783 | return drv->bdrv_getlength(bs); | |
fc01f7e7 FB |
784 | } |
785 | ||
19cb3738 | 786 | /* return 0 as number of sectors if no device present or error */ |
96b8f136 | 787 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
fc01f7e7 | 788 | { |
19cb3738 FB |
789 | int64_t length; |
790 | length = bdrv_getlength(bs); | |
791 | if (length < 0) | |
792 | length = 0; | |
793 | else | |
794 | length = length >> SECTOR_BITS; | |
795 | *nb_sectors_ptr = length; | |
fc01f7e7 | 796 | } |
cf98951b | 797 | |
f3d54fc4 AL |
798 | struct partition { |
799 | uint8_t boot_ind; /* 0x80 - active */ | |
800 | uint8_t head; /* starting head */ | |
801 | uint8_t sector; /* starting sector */ | |
802 | uint8_t cyl; /* starting cylinder */ | |
803 | uint8_t sys_ind; /* What partition type */ | |
804 | uint8_t end_head; /* end head */ | |
805 | uint8_t end_sector; /* end sector */ | |
806 | uint8_t end_cyl; /* end cylinder */ | |
807 | uint32_t start_sect; /* starting sector counting from 0 */ | |
808 | uint32_t nr_sects; /* nr of sectors in partition */ | |
809 | } __attribute__((packed)); | |
810 | ||
811 | /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */ | |
812 | static int guess_disk_lchs(BlockDriverState *bs, | |
813 | int *pcylinders, int *pheads, int *psectors) | |
814 | { | |
815 | uint8_t buf[512]; | |
816 | int ret, i, heads, sectors, cylinders; | |
817 | struct partition *p; | |
818 | uint32_t nr_sects; | |
a38131b6 | 819 | uint64_t nb_sectors; |
f3d54fc4 AL |
820 | |
821 | bdrv_get_geometry(bs, &nb_sectors); | |
822 | ||
823 | ret = bdrv_read(bs, 0, buf, 1); | |
824 | if (ret < 0) | |
825 | return -1; | |
826 | /* test msdos magic */ | |
827 | if (buf[510] != 0x55 || buf[511] != 0xaa) | |
828 | return -1; | |
829 | for(i = 0; i < 4; i++) { | |
830 | p = ((struct partition *)(buf + 0x1be)) + i; | |
831 | nr_sects = le32_to_cpu(p->nr_sects); | |
832 | if (nr_sects && p->end_head) { | |
833 | /* We make the assumption that the partition terminates on | |
834 | a cylinder boundary */ | |
835 | heads = p->end_head + 1; | |
836 | sectors = p->end_sector & 63; | |
837 | if (sectors == 0) | |
838 | continue; | |
839 | cylinders = nb_sectors / (heads * sectors); | |
840 | if (cylinders < 1 || cylinders > 16383) | |
841 | continue; | |
842 | *pheads = heads; | |
843 | *psectors = sectors; | |
844 | *pcylinders = cylinders; | |
845 | #if 0 | |
846 | printf("guessed geometry: LCHS=%d %d %d\n", | |
847 | cylinders, heads, sectors); | |
848 | #endif | |
849 | return 0; | |
850 | } | |
851 | } | |
852 | return -1; | |
853 | } | |
854 | ||
855 | void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) | |
856 | { | |
857 | int translation, lba_detected = 0; | |
858 | int cylinders, heads, secs; | |
a38131b6 | 859 | uint64_t nb_sectors; |
f3d54fc4 AL |
860 | |
861 | /* if a geometry hint is available, use it */ | |
862 | bdrv_get_geometry(bs, &nb_sectors); | |
863 | bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); | |
864 | translation = bdrv_get_translation_hint(bs); | |
865 | if (cylinders != 0) { | |
866 | *pcyls = cylinders; | |
867 | *pheads = heads; | |
868 | *psecs = secs; | |
869 | } else { | |
870 | if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { | |
871 | if (heads > 16) { | |
872 | /* if heads > 16, it means that a BIOS LBA | |
873 | translation was active, so the default | |
874 | hardware geometry is OK */ | |
875 | lba_detected = 1; | |
876 | goto default_geometry; | |
877 | } else { | |
878 | *pcyls = cylinders; | |
879 | *pheads = heads; | |
880 | *psecs = secs; | |
881 | /* disable any translation to be in sync with | |
882 | the logical geometry */ | |
883 | if (translation == BIOS_ATA_TRANSLATION_AUTO) { | |
884 | bdrv_set_translation_hint(bs, | |
885 | BIOS_ATA_TRANSLATION_NONE); | |
886 | } | |
887 | } | |
888 | } else { | |
889 | default_geometry: | |
890 | /* if no geometry, use a standard physical disk geometry */ | |
891 | cylinders = nb_sectors / (16 * 63); | |
892 | ||
893 | if (cylinders > 16383) | |
894 | cylinders = 16383; | |
895 | else if (cylinders < 2) | |
896 | cylinders = 2; | |
897 | *pcyls = cylinders; | |
898 | *pheads = 16; | |
899 | *psecs = 63; | |
900 | if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { | |
901 | if ((*pcyls * *pheads) <= 131072) { | |
902 | bdrv_set_translation_hint(bs, | |
903 | BIOS_ATA_TRANSLATION_LARGE); | |
904 | } else { | |
905 | bdrv_set_translation_hint(bs, | |
906 | BIOS_ATA_TRANSLATION_LBA); | |
907 | } | |
908 | } | |
909 | } | |
910 | bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); | |
911 | } | |
912 | } | |
913 | ||
5fafdf24 | 914 | void bdrv_set_geometry_hint(BlockDriverState *bs, |
b338082b FB |
915 | int cyls, int heads, int secs) |
916 | { | |
917 | bs->cyls = cyls; | |
918 | bs->heads = heads; | |
919 | bs->secs = secs; | |
920 | } | |
921 | ||
922 | void bdrv_set_type_hint(BlockDriverState *bs, int type) | |
923 | { | |
924 | bs->type = type; | |
925 | bs->removable = ((type == BDRV_TYPE_CDROM || | |
926 | type == BDRV_TYPE_FLOPPY)); | |
927 | } | |
928 | ||
46d4767d FB |
929 | void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
930 | { | |
931 | bs->translation = translation; | |
932 | } | |
933 | ||
5fafdf24 | 934 | void bdrv_get_geometry_hint(BlockDriverState *bs, |
b338082b FB |
935 | int *pcyls, int *pheads, int *psecs) |
936 | { | |
937 | *pcyls = bs->cyls; | |
938 | *pheads = bs->heads; | |
939 | *psecs = bs->secs; | |
940 | } | |
941 | ||
942 | int bdrv_get_type_hint(BlockDriverState *bs) | |
943 | { | |
944 | return bs->type; | |
945 | } | |
946 | ||
46d4767d FB |
947 | int bdrv_get_translation_hint(BlockDriverState *bs) |
948 | { | |
949 | return bs->translation; | |
950 | } | |
951 | ||
b338082b FB |
952 | int bdrv_is_removable(BlockDriverState *bs) |
953 | { | |
954 | return bs->removable; | |
955 | } | |
956 | ||
957 | int bdrv_is_read_only(BlockDriverState *bs) | |
958 | { | |
959 | return bs->read_only; | |
960 | } | |
961 | ||
59f2689d NS |
962 | int bdrv_set_read_only(BlockDriverState *bs, int read_only) |
963 | { | |
964 | int ret = bs->read_only; | |
965 | bs->read_only = read_only; | |
966 | return ret; | |
967 | } | |
968 | ||
985a03b0 TS |
969 | int bdrv_is_sg(BlockDriverState *bs) |
970 | { | |
971 | return bs->sg; | |
972 | } | |
973 | ||
e900a7b7 CH |
974 | int bdrv_enable_write_cache(BlockDriverState *bs) |
975 | { | |
976 | return bs->enable_write_cache; | |
977 | } | |
978 | ||
19cb3738 | 979 | /* XXX: no longer used */ |
5fafdf24 | 980 | void bdrv_set_change_cb(BlockDriverState *bs, |
b338082b FB |
981 | void (*change_cb)(void *opaque), void *opaque) |
982 | { | |
983 | bs->change_cb = change_cb; | |
984 | bs->change_opaque = opaque; | |
985 | } | |
986 | ||
ea2384d3 FB |
987 | int bdrv_is_encrypted(BlockDriverState *bs) |
988 | { | |
989 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
990 | return 1; | |
991 | return bs->encrypted; | |
992 | } | |
993 | ||
c0f4ce77 AL |
994 | int bdrv_key_required(BlockDriverState *bs) |
995 | { | |
996 | BlockDriverState *backing_hd = bs->backing_hd; | |
997 | ||
998 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) | |
999 | return 1; | |
1000 | return (bs->encrypted && !bs->valid_key); | |
1001 | } | |
1002 | ||
ea2384d3 FB |
1003 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
1004 | { | |
1005 | int ret; | |
1006 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
1007 | ret = bdrv_set_key(bs->backing_hd, key); | |
1008 | if (ret < 0) | |
1009 | return ret; | |
1010 | if (!bs->encrypted) | |
1011 | return 0; | |
1012 | } | |
1013 | if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key) | |
1014 | return -1; | |
c0f4ce77 | 1015 | ret = bs->drv->bdrv_set_key(bs, key); |
bb5fc20f AL |
1016 | if (ret < 0) { |
1017 | bs->valid_key = 0; | |
1018 | } else if (!bs->valid_key) { | |
1019 | bs->valid_key = 1; | |
1020 | /* call the change callback now, we skipped it on open */ | |
1021 | bs->media_changed = 1; | |
1022 | if (bs->change_cb) | |
1023 | bs->change_cb(bs->change_opaque); | |
1024 | } | |
c0f4ce77 | 1025 | return ret; |
ea2384d3 FB |
1026 | } |
1027 | ||
1028 | void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) | |
1029 | { | |
19cb3738 | 1030 | if (!bs->drv) { |
ea2384d3 FB |
1031 | buf[0] = '\0'; |
1032 | } else { | |
1033 | pstrcpy(buf, buf_size, bs->drv->format_name); | |
1034 | } | |
1035 | } | |
1036 | ||
5fafdf24 | 1037 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
ea2384d3 FB |
1038 | void *opaque) |
1039 | { | |
1040 | BlockDriver *drv; | |
1041 | ||
1042 | for (drv = first_drv; drv != NULL; drv = drv->next) { | |
1043 | it(opaque, drv->format_name); | |
1044 | } | |
1045 | } | |
1046 | ||
b338082b FB |
1047 | BlockDriverState *bdrv_find(const char *name) |
1048 | { | |
1049 | BlockDriverState *bs; | |
1050 | ||
1051 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
1052 | if (!strcmp(name, bs->device_name)) | |
1053 | return bs; | |
1054 | } | |
1055 | return NULL; | |
1056 | } | |
1057 | ||
51de9760 | 1058 | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
81d0912d FB |
1059 | { |
1060 | BlockDriverState *bs; | |
1061 | ||
1062 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
51de9760 | 1063 | it(opaque, bs); |
81d0912d FB |
1064 | } |
1065 | } | |
1066 | ||
ea2384d3 FB |
1067 | const char *bdrv_get_device_name(BlockDriverState *bs) |
1068 | { | |
1069 | return bs->device_name; | |
1070 | } | |
1071 | ||
7a6cba61 PB |
1072 | void bdrv_flush(BlockDriverState *bs) |
1073 | { | |
081501da AL |
1074 | if (!bs->drv) |
1075 | return; | |
7a6cba61 PB |
1076 | if (bs->drv->bdrv_flush) |
1077 | bs->drv->bdrv_flush(bs); | |
1078 | if (bs->backing_hd) | |
1079 | bdrv_flush(bs->backing_hd); | |
1080 | } | |
1081 | ||
c6ca28d6 AL |
1082 | void bdrv_flush_all(void) |
1083 | { | |
1084 | BlockDriverState *bs; | |
1085 | ||
1086 | for (bs = bdrv_first; bs != NULL; bs = bs->next) | |
1087 | if (bs->drv && !bdrv_is_read_only(bs) && | |
1088 | (!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) | |
1089 | bdrv_flush(bs); | |
1090 | } | |
1091 | ||
f58c7b35 TS |
1092 | /* |
1093 | * Returns true iff the specified sector is present in the disk image. Drivers | |
1094 | * not implementing the functionality are assumed to not support backing files, | |
1095 | * hence all their sectors are reported as allocated. | |
1096 | * | |
1097 | * 'pnum' is set to the number of sectors (including and immediately following | |
1098 | * the specified sector) that are known to be in the same | |
1099 | * allocated/unallocated state. | |
1100 | * | |
1101 | * 'nb_sectors' is the max value 'pnum' should be set to. | |
1102 | */ | |
1103 | int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, | |
1104 | int *pnum) | |
1105 | { | |
1106 | int64_t n; | |
1107 | if (!bs->drv->bdrv_is_allocated) { | |
1108 | if (sector_num >= bs->total_sectors) { | |
1109 | *pnum = 0; | |
1110 | return 0; | |
1111 | } | |
1112 | n = bs->total_sectors - sector_num; | |
1113 | *pnum = (n < nb_sectors) ? (n) : (nb_sectors); | |
1114 | return 1; | |
1115 | } | |
1116 | return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum); | |
1117 | } | |
1118 | ||
376253ec | 1119 | void bdrv_info(Monitor *mon) |
b338082b FB |
1120 | { |
1121 | BlockDriverState *bs; | |
1122 | ||
1123 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
376253ec AL |
1124 | monitor_printf(mon, "%s:", bs->device_name); |
1125 | monitor_printf(mon, " type="); | |
b338082b FB |
1126 | switch(bs->type) { |
1127 | case BDRV_TYPE_HD: | |
376253ec | 1128 | monitor_printf(mon, "hd"); |
b338082b FB |
1129 | break; |
1130 | case BDRV_TYPE_CDROM: | |
376253ec | 1131 | monitor_printf(mon, "cdrom"); |
b338082b FB |
1132 | break; |
1133 | case BDRV_TYPE_FLOPPY: | |
376253ec | 1134 | monitor_printf(mon, "floppy"); |
b338082b FB |
1135 | break; |
1136 | } | |
376253ec | 1137 | monitor_printf(mon, " removable=%d", bs->removable); |
b338082b | 1138 | if (bs->removable) { |
376253ec | 1139 | monitor_printf(mon, " locked=%d", bs->locked); |
b338082b | 1140 | } |
19cb3738 | 1141 | if (bs->drv) { |
376253ec AL |
1142 | monitor_printf(mon, " file="); |
1143 | monitor_print_filename(mon, bs->filename); | |
fef30743 | 1144 | if (bs->backing_file[0] != '\0') { |
376253ec AL |
1145 | monitor_printf(mon, " backing_file="); |
1146 | monitor_print_filename(mon, bs->backing_file); | |
1147 | } | |
1148 | monitor_printf(mon, " ro=%d", bs->read_only); | |
1149 | monitor_printf(mon, " drv=%s", bs->drv->format_name); | |
1150 | monitor_printf(mon, " encrypted=%d", bdrv_is_encrypted(bs)); | |
b338082b | 1151 | } else { |
376253ec | 1152 | monitor_printf(mon, " [not inserted]"); |
b338082b | 1153 | } |
376253ec | 1154 | monitor_printf(mon, "\n"); |
b338082b FB |
1155 | } |
1156 | } | |
a36e69dd TS |
1157 | |
1158 | /* The "info blockstats" command. */ | |
376253ec | 1159 | void bdrv_info_stats(Monitor *mon) |
a36e69dd TS |
1160 | { |
1161 | BlockDriverState *bs; | |
1162 | ||
1163 | for (bs = bdrv_first; bs != NULL; bs = bs->next) { | |
376253ec AL |
1164 | monitor_printf(mon, "%s:" |
1165 | " rd_bytes=%" PRIu64 | |
1166 | " wr_bytes=%" PRIu64 | |
1167 | " rd_operations=%" PRIu64 | |
1168 | " wr_operations=%" PRIu64 | |
ebf53fcd | 1169 | "\n", |
376253ec AL |
1170 | bs->device_name, |
1171 | bs->rd_bytes, bs->wr_bytes, | |
1172 | bs->rd_ops, bs->wr_ops); | |
a36e69dd TS |
1173 | } |
1174 | } | |
ea2384d3 | 1175 | |
045df330 AL |
1176 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
1177 | { | |
1178 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
1179 | return bs->backing_file; | |
1180 | else if (bs->encrypted) | |
1181 | return bs->filename; | |
1182 | else | |
1183 | return NULL; | |
1184 | } | |
1185 | ||
5fafdf24 | 1186 | void bdrv_get_backing_filename(BlockDriverState *bs, |
83f64091 FB |
1187 | char *filename, int filename_size) |
1188 | { | |
1189 | if (!bs->backing_hd) { | |
1190 | pstrcpy(filename, filename_size, ""); | |
1191 | } else { | |
1192 | pstrcpy(filename, filename_size, bs->backing_file); | |
1193 | } | |
1194 | } | |
1195 | ||
5fafdf24 | 1196 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
faea38e7 FB |
1197 | const uint8_t *buf, int nb_sectors) |
1198 | { | |
1199 | BlockDriver *drv = bs->drv; | |
1200 | if (!drv) | |
19cb3738 | 1201 | return -ENOMEDIUM; |
faea38e7 FB |
1202 | if (!drv->bdrv_write_compressed) |
1203 | return -ENOTSUP; | |
fbb7b4e0 KW |
1204 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
1205 | return -EIO; | |
faea38e7 FB |
1206 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
1207 | } | |
3b46e624 | 1208 | |
faea38e7 FB |
1209 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
1210 | { | |
1211 | BlockDriver *drv = bs->drv; | |
1212 | if (!drv) | |
19cb3738 | 1213 | return -ENOMEDIUM; |
faea38e7 FB |
1214 | if (!drv->bdrv_get_info) |
1215 | return -ENOTSUP; | |
1216 | memset(bdi, 0, sizeof(*bdi)); | |
1217 | return drv->bdrv_get_info(bs, bdi); | |
1218 | } | |
1219 | ||
45566e9c CH |
1220 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
1221 | int64_t pos, int size) | |
178e08a5 AL |
1222 | { |
1223 | BlockDriver *drv = bs->drv; | |
1224 | if (!drv) | |
1225 | return -ENOMEDIUM; | |
45566e9c | 1226 | if (!drv->bdrv_save_vmstate) |
178e08a5 | 1227 | return -ENOTSUP; |
45566e9c | 1228 | return drv->bdrv_save_vmstate(bs, buf, pos, size); |
178e08a5 AL |
1229 | } |
1230 | ||
45566e9c CH |
1231 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
1232 | int64_t pos, int size) | |
178e08a5 AL |
1233 | { |
1234 | BlockDriver *drv = bs->drv; | |
1235 | if (!drv) | |
1236 | return -ENOMEDIUM; | |
45566e9c | 1237 | if (!drv->bdrv_load_vmstate) |
178e08a5 | 1238 | return -ENOTSUP; |
45566e9c | 1239 | return drv->bdrv_load_vmstate(bs, buf, pos, size); |
178e08a5 AL |
1240 | } |
1241 | ||
faea38e7 FB |
1242 | /**************************************************************/ |
1243 | /* handling of snapshots */ | |
1244 | ||
5fafdf24 | 1245 | int bdrv_snapshot_create(BlockDriverState *bs, |
faea38e7 FB |
1246 | QEMUSnapshotInfo *sn_info) |
1247 | { | |
1248 | BlockDriver *drv = bs->drv; | |
1249 | if (!drv) | |
19cb3738 | 1250 | return -ENOMEDIUM; |
faea38e7 FB |
1251 | if (!drv->bdrv_snapshot_create) |
1252 | return -ENOTSUP; | |
1253 | return drv->bdrv_snapshot_create(bs, sn_info); | |
1254 | } | |
1255 | ||
5fafdf24 | 1256 | int bdrv_snapshot_goto(BlockDriverState *bs, |
faea38e7 FB |
1257 | const char *snapshot_id) |
1258 | { | |
1259 | BlockDriver *drv = bs->drv; | |
1260 | if (!drv) | |
19cb3738 | 1261 | return -ENOMEDIUM; |
faea38e7 FB |
1262 | if (!drv->bdrv_snapshot_goto) |
1263 | return -ENOTSUP; | |
1264 | return drv->bdrv_snapshot_goto(bs, snapshot_id); | |
1265 | } | |
1266 | ||
1267 | int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) | |
1268 | { | |
1269 | BlockDriver *drv = bs->drv; | |
1270 | if (!drv) | |
19cb3738 | 1271 | return -ENOMEDIUM; |
faea38e7 FB |
1272 | if (!drv->bdrv_snapshot_delete) |
1273 | return -ENOTSUP; | |
1274 | return drv->bdrv_snapshot_delete(bs, snapshot_id); | |
1275 | } | |
1276 | ||
5fafdf24 | 1277 | int bdrv_snapshot_list(BlockDriverState *bs, |
faea38e7 FB |
1278 | QEMUSnapshotInfo **psn_info) |
1279 | { | |
1280 | BlockDriver *drv = bs->drv; | |
1281 | if (!drv) | |
19cb3738 | 1282 | return -ENOMEDIUM; |
faea38e7 FB |
1283 | if (!drv->bdrv_snapshot_list) |
1284 | return -ENOTSUP; | |
1285 | return drv->bdrv_snapshot_list(bs, psn_info); | |
1286 | } | |
1287 | ||
1288 | #define NB_SUFFIXES 4 | |
1289 | ||
1290 | char *get_human_readable_size(char *buf, int buf_size, int64_t size) | |
1291 | { | |
1292 | static const char suffixes[NB_SUFFIXES] = "KMGT"; | |
1293 | int64_t base; | |
1294 | int i; | |
1295 | ||
1296 | if (size <= 999) { | |
1297 | snprintf(buf, buf_size, "%" PRId64, size); | |
1298 | } else { | |
1299 | base = 1024; | |
1300 | for(i = 0; i < NB_SUFFIXES; i++) { | |
1301 | if (size < (10 * base)) { | |
5fafdf24 | 1302 | snprintf(buf, buf_size, "%0.1f%c", |
faea38e7 FB |
1303 | (double)size / base, |
1304 | suffixes[i]); | |
1305 | break; | |
1306 | } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { | |
5fafdf24 | 1307 | snprintf(buf, buf_size, "%" PRId64 "%c", |
faea38e7 FB |
1308 | ((size + (base >> 1)) / base), |
1309 | suffixes[i]); | |
1310 | break; | |
1311 | } | |
1312 | base = base * 1024; | |
1313 | } | |
1314 | } | |
1315 | return buf; | |
1316 | } | |
1317 | ||
1318 | char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) | |
1319 | { | |
1320 | char buf1[128], date_buf[128], clock_buf[128]; | |
3b9f94e1 FB |
1321 | #ifdef _WIN32 |
1322 | struct tm *ptm; | |
1323 | #else | |
faea38e7 | 1324 | struct tm tm; |
3b9f94e1 | 1325 | #endif |
faea38e7 FB |
1326 | time_t ti; |
1327 | int64_t secs; | |
1328 | ||
1329 | if (!sn) { | |
5fafdf24 TS |
1330 | snprintf(buf, buf_size, |
1331 | "%-10s%-20s%7s%20s%15s", | |
faea38e7 FB |
1332 | "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
1333 | } else { | |
1334 | ti = sn->date_sec; | |
3b9f94e1 FB |
1335 | #ifdef _WIN32 |
1336 | ptm = localtime(&ti); | |
1337 | strftime(date_buf, sizeof(date_buf), | |
1338 | "%Y-%m-%d %H:%M:%S", ptm); | |
1339 | #else | |
faea38e7 FB |
1340 | localtime_r(&ti, &tm); |
1341 | strftime(date_buf, sizeof(date_buf), | |
1342 | "%Y-%m-%d %H:%M:%S", &tm); | |
3b9f94e1 | 1343 | #endif |
faea38e7 FB |
1344 | secs = sn->vm_clock_nsec / 1000000000; |
1345 | snprintf(clock_buf, sizeof(clock_buf), | |
1346 | "%02d:%02d:%02d.%03d", | |
1347 | (int)(secs / 3600), | |
1348 | (int)((secs / 60) % 60), | |
5fafdf24 | 1349 | (int)(secs % 60), |
faea38e7 FB |
1350 | (int)((sn->vm_clock_nsec / 1000000) % 1000)); |
1351 | snprintf(buf, buf_size, | |
5fafdf24 | 1352 | "%-10s%-20s%7s%20s%15s", |
faea38e7 FB |
1353 | sn->id_str, sn->name, |
1354 | get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), | |
1355 | date_buf, | |
1356 | clock_buf); | |
1357 | } | |
1358 | return buf; | |
1359 | } | |
1360 | ||
83f64091 | 1361 | |
ea2384d3 | 1362 | /**************************************************************/ |
83f64091 | 1363 | /* async I/Os */ |
ea2384d3 | 1364 | |
3b69e4b9 | 1365 | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
f141eafe | 1366 | QEMUIOVector *qiov, int nb_sectors, |
3b69e4b9 | 1367 | BlockDriverCompletionFunc *cb, void *opaque) |
83f64091 FB |
1368 | { |
1369 | BlockDriver *drv = bs->drv; | |
a36e69dd | 1370 | BlockDriverAIOCB *ret; |
83f64091 | 1371 | |
19cb3738 | 1372 | if (!drv) |
ce1a14dc | 1373 | return NULL; |
71d0770c AL |
1374 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
1375 | return NULL; | |
3b46e624 | 1376 | |
f141eafe AL |
1377 | ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors, |
1378 | cb, opaque); | |
a36e69dd TS |
1379 | |
1380 | if (ret) { | |
1381 | /* Update stats even though technically transfer has not happened. */ | |
1382 | bs->rd_bytes += (unsigned) nb_sectors * SECTOR_SIZE; | |
1383 | bs->rd_ops ++; | |
1384 | } | |
1385 | ||
1386 | return ret; | |
ea2384d3 FB |
1387 | } |
1388 | ||
f141eafe AL |
1389 | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
1390 | QEMUIOVector *qiov, int nb_sectors, | |
1391 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 1392 | { |
83f64091 | 1393 | BlockDriver *drv = bs->drv; |
a36e69dd | 1394 | BlockDriverAIOCB *ret; |
ea2384d3 | 1395 | |
19cb3738 | 1396 | if (!drv) |
ce1a14dc | 1397 | return NULL; |
83f64091 | 1398 | if (bs->read_only) |
ce1a14dc | 1399 | return NULL; |
71d0770c AL |
1400 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
1401 | return NULL; | |
83f64091 | 1402 | |
f141eafe AL |
1403 | ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors, |
1404 | cb, opaque); | |
a36e69dd TS |
1405 | |
1406 | if (ret) { | |
1407 | /* Update stats even though technically transfer has not happened. */ | |
1408 | bs->wr_bytes += (unsigned) nb_sectors * SECTOR_SIZE; | |
1409 | bs->wr_ops ++; | |
1410 | } | |
1411 | ||
1412 | return ret; | |
83f64091 FB |
1413 | } |
1414 | ||
40b4f539 KW |
1415 | |
1416 | typedef struct MultiwriteCB { | |
1417 | int error; | |
1418 | int num_requests; | |
1419 | int num_callbacks; | |
1420 | struct { | |
1421 | BlockDriverCompletionFunc *cb; | |
1422 | void *opaque; | |
1423 | QEMUIOVector *free_qiov; | |
1424 | void *free_buf; | |
1425 | } callbacks[]; | |
1426 | } MultiwriteCB; | |
1427 | ||
1428 | static void multiwrite_user_cb(MultiwriteCB *mcb) | |
1429 | { | |
1430 | int i; | |
1431 | ||
1432 | for (i = 0; i < mcb->num_callbacks; i++) { | |
1433 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); | |
1434 | qemu_free(mcb->callbacks[i].free_qiov); | |
1435 | qemu_free(mcb->callbacks[i].free_buf); | |
1436 | } | |
1437 | } | |
1438 | ||
1439 | static void multiwrite_cb(void *opaque, int ret) | |
1440 | { | |
1441 | MultiwriteCB *mcb = opaque; | |
1442 | ||
1443 | if (ret < 0) { | |
1444 | mcb->error = ret; | |
1445 | multiwrite_user_cb(mcb); | |
1446 | } | |
1447 | ||
1448 | mcb->num_requests--; | |
1449 | if (mcb->num_requests == 0) { | |
1450 | if (mcb->error == 0) { | |
1451 | multiwrite_user_cb(mcb); | |
1452 | } | |
1453 | qemu_free(mcb); | |
1454 | } | |
1455 | } | |
1456 | ||
1457 | static int multiwrite_req_compare(const void *a, const void *b) | |
1458 | { | |
1459 | return (((BlockRequest*) a)->sector - ((BlockRequest*) b)->sector); | |
1460 | } | |
1461 | ||
1462 | /* | |
1463 | * Takes a bunch of requests and tries to merge them. Returns the number of | |
1464 | * requests that remain after merging. | |
1465 | */ | |
1466 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, | |
1467 | int num_reqs, MultiwriteCB *mcb) | |
1468 | { | |
1469 | int i, outidx; | |
1470 | ||
1471 | // Sort requests by start sector | |
1472 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); | |
1473 | ||
1474 | // Check if adjacent requests touch the same clusters. If so, combine them, | |
1475 | // filling up gaps with zero sectors. | |
1476 | outidx = 0; | |
1477 | for (i = 1; i < num_reqs; i++) { | |
1478 | int merge = 0; | |
1479 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; | |
1480 | ||
1481 | // This handles the cases that are valid for all block drivers, namely | |
1482 | // exactly sequential writes and overlapping writes. | |
1483 | if (reqs[i].sector <= oldreq_last) { | |
1484 | merge = 1; | |
1485 | } | |
1486 | ||
1487 | // The block driver may decide that it makes sense to combine requests | |
1488 | // even if there is a gap of some sectors between them. In this case, | |
1489 | // the gap is filled with zeros (therefore only applicable for yet | |
1490 | // unused space in format like qcow2). | |
1491 | if (!merge && bs->drv->bdrv_merge_requests) { | |
1492 | merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]); | |
1493 | } | |
1494 | ||
1495 | if (merge) { | |
1496 | size_t size; | |
1497 | QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov)); | |
1498 | qemu_iovec_init(qiov, | |
1499 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); | |
1500 | ||
1501 | // Add the first request to the merged one. If the requests are | |
1502 | // overlapping, drop the last sectors of the first request. | |
1503 | size = (reqs[i].sector - reqs[outidx].sector) << 9; | |
1504 | qemu_iovec_concat(qiov, reqs[outidx].qiov, size); | |
1505 | ||
1506 | // We might need to add some zeros between the two requests | |
1507 | if (reqs[i].sector > oldreq_last) { | |
1508 | size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9; | |
1509 | uint8_t *buf = qemu_blockalign(bs, zero_bytes); | |
1510 | memset(buf, 0, zero_bytes); | |
1511 | qemu_iovec_add(qiov, buf, zero_bytes); | |
1512 | mcb->callbacks[i].free_buf = buf; | |
1513 | } | |
1514 | ||
1515 | // Add the second request | |
1516 | qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size); | |
1517 | ||
1518 | reqs[outidx].nb_sectors += reqs[i].nb_sectors; | |
1519 | reqs[outidx].qiov = qiov; | |
1520 | ||
1521 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; | |
1522 | } else { | |
1523 | outidx++; | |
1524 | reqs[outidx].sector = reqs[i].sector; | |
1525 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; | |
1526 | reqs[outidx].qiov = reqs[i].qiov; | |
1527 | } | |
1528 | } | |
1529 | ||
1530 | return outidx + 1; | |
1531 | } | |
1532 | ||
1533 | /* | |
1534 | * Submit multiple AIO write requests at once. | |
1535 | * | |
1536 | * On success, the function returns 0 and all requests in the reqs array have | |
1537 | * been submitted. In error case this function returns -1, and any of the | |
1538 | * requests may or may not be submitted yet. In particular, this means that the | |
1539 | * callback will be called for some of the requests, for others it won't. The | |
1540 | * caller must check the error field of the BlockRequest to wait for the right | |
1541 | * callbacks (if error != 0, no callback will be called). | |
1542 | * | |
1543 | * The implementation may modify the contents of the reqs array, e.g. to merge | |
1544 | * requests. However, the fields opaque and error are left unmodified as they | |
1545 | * are used to signal failure for a single request to the caller. | |
1546 | */ | |
1547 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) | |
1548 | { | |
1549 | BlockDriverAIOCB *acb; | |
1550 | MultiwriteCB *mcb; | |
1551 | int i; | |
1552 | ||
1553 | if (num_reqs == 0) { | |
1554 | return 0; | |
1555 | } | |
1556 | ||
1557 | // Create MultiwriteCB structure | |
1558 | mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); | |
1559 | mcb->num_requests = 0; | |
1560 | mcb->num_callbacks = num_reqs; | |
1561 | ||
1562 | for (i = 0; i < num_reqs; i++) { | |
1563 | mcb->callbacks[i].cb = reqs[i].cb; | |
1564 | mcb->callbacks[i].opaque = reqs[i].opaque; | |
1565 | } | |
1566 | ||
1567 | // Check for mergable requests | |
1568 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); | |
1569 | ||
1570 | // Run the aio requests | |
1571 | for (i = 0; i < num_reqs; i++) { | |
1572 | acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, | |
1573 | reqs[i].nb_sectors, multiwrite_cb, mcb); | |
1574 | ||
1575 | if (acb == NULL) { | |
1576 | // We can only fail the whole thing if no request has been | |
1577 | // submitted yet. Otherwise we'll wait for the submitted AIOs to | |
1578 | // complete and report the error in the callback. | |
1579 | if (mcb->num_requests == 0) { | |
1580 | reqs[i].error = EIO; | |
1581 | goto fail; | |
1582 | } else { | |
1583 | mcb->error = EIO; | |
1584 | break; | |
1585 | } | |
1586 | } else { | |
1587 | mcb->num_requests++; | |
1588 | } | |
1589 | } | |
1590 | ||
1591 | return 0; | |
1592 | ||
1593 | fail: | |
1594 | free(mcb); | |
1595 | return -1; | |
1596 | } | |
1597 | ||
b2e12bc6 CH |
1598 | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
1599 | BlockDriverCompletionFunc *cb, void *opaque) | |
1600 | { | |
1601 | BlockDriver *drv = bs->drv; | |
1602 | ||
1603 | if (!drv) | |
1604 | return NULL; | |
1605 | ||
1606 | /* | |
1607 | * Note that unlike bdrv_flush the driver is reponsible for flushing a | |
1608 | * backing image if it exists. | |
1609 | */ | |
1610 | return drv->bdrv_aio_flush(bs, cb, opaque); | |
1611 | } | |
1612 | ||
83f64091 | 1613 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
83f64091 | 1614 | { |
6bbff9a0 | 1615 | acb->pool->cancel(acb); |
83f64091 FB |
1616 | } |
1617 | ||
ce1a14dc | 1618 | |
83f64091 FB |
1619 | /**************************************************************/ |
1620 | /* async block device emulation */ | |
1621 | ||
c16b5a2c CH |
1622 | typedef struct BlockDriverAIOCBSync { |
1623 | BlockDriverAIOCB common; | |
1624 | QEMUBH *bh; | |
1625 | int ret; | |
1626 | /* vector translation state */ | |
1627 | QEMUIOVector *qiov; | |
1628 | uint8_t *bounce; | |
1629 | int is_write; | |
1630 | } BlockDriverAIOCBSync; | |
1631 | ||
1632 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) | |
1633 | { | |
1634 | BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb; | |
6a7ad299 | 1635 | qemu_bh_delete(acb->bh); |
36afc451 | 1636 | acb->bh = NULL; |
c16b5a2c CH |
1637 | qemu_aio_release(acb); |
1638 | } | |
1639 | ||
1640 | static AIOPool bdrv_em_aio_pool = { | |
1641 | .aiocb_size = sizeof(BlockDriverAIOCBSync), | |
1642 | .cancel = bdrv_aio_cancel_em, | |
1643 | }; | |
1644 | ||
ce1a14dc | 1645 | static void bdrv_aio_bh_cb(void *opaque) |
83f64091 | 1646 | { |
ce1a14dc | 1647 | BlockDriverAIOCBSync *acb = opaque; |
f141eafe | 1648 | |
f141eafe AL |
1649 | if (!acb->is_write) |
1650 | qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); | |
ceb42de8 | 1651 | qemu_vfree(acb->bounce); |
ce1a14dc | 1652 | acb->common.cb(acb->common.opaque, acb->ret); |
6a7ad299 | 1653 | qemu_bh_delete(acb->bh); |
36afc451 | 1654 | acb->bh = NULL; |
ce1a14dc | 1655 | qemu_aio_release(acb); |
83f64091 | 1656 | } |
beac80cd | 1657 | |
f141eafe AL |
1658 | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
1659 | int64_t sector_num, | |
1660 | QEMUIOVector *qiov, | |
1661 | int nb_sectors, | |
1662 | BlockDriverCompletionFunc *cb, | |
1663 | void *opaque, | |
1664 | int is_write) | |
1665 | ||
83f64091 | 1666 | { |
ce1a14dc | 1667 | BlockDriverAIOCBSync *acb; |
ce1a14dc | 1668 | |
c16b5a2c | 1669 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
f141eafe AL |
1670 | acb->is_write = is_write; |
1671 | acb->qiov = qiov; | |
e268ca52 | 1672 | acb->bounce = qemu_blockalign(bs, qiov->size); |
f141eafe | 1673 | |
ce1a14dc PB |
1674 | if (!acb->bh) |
1675 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
f141eafe AL |
1676 | |
1677 | if (is_write) { | |
1678 | qemu_iovec_to_buffer(acb->qiov, acb->bounce); | |
1679 | acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors); | |
1680 | } else { | |
1681 | acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors); | |
1682 | } | |
1683 | ||
ce1a14dc | 1684 | qemu_bh_schedule(acb->bh); |
f141eafe | 1685 | |
ce1a14dc | 1686 | return &acb->common; |
beac80cd FB |
1687 | } |
1688 | ||
f141eafe AL |
1689 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
1690 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 1691 | BlockDriverCompletionFunc *cb, void *opaque) |
beac80cd | 1692 | { |
f141eafe AL |
1693 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
1694 | } | |
83f64091 | 1695 | |
f141eafe AL |
1696 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
1697 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
1698 | BlockDriverCompletionFunc *cb, void *opaque) | |
1699 | { | |
1700 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); | |
beac80cd | 1701 | } |
beac80cd | 1702 | |
b2e12bc6 CH |
1703 | static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, |
1704 | BlockDriverCompletionFunc *cb, void *opaque) | |
1705 | { | |
1706 | BlockDriverAIOCBSync *acb; | |
1707 | ||
1708 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); | |
1709 | acb->is_write = 1; /* don't bounce in the completion hadler */ | |
1710 | acb->qiov = NULL; | |
1711 | acb->bounce = NULL; | |
1712 | acb->ret = 0; | |
1713 | ||
1714 | if (!acb->bh) | |
1715 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
1716 | ||
1717 | bdrv_flush(bs); | |
1718 | qemu_bh_schedule(acb->bh); | |
1719 | return &acb->common; | |
1720 | } | |
1721 | ||
83f64091 FB |
1722 | /**************************************************************/ |
1723 | /* sync block device emulation */ | |
ea2384d3 | 1724 | |
83f64091 FB |
1725 | static void bdrv_rw_em_cb(void *opaque, int ret) |
1726 | { | |
1727 | *(int *)opaque = ret; | |
ea2384d3 FB |
1728 | } |
1729 | ||
83f64091 FB |
1730 | #define NOT_DONE 0x7fffffff |
1731 | ||
5fafdf24 | 1732 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
83f64091 | 1733 | uint8_t *buf, int nb_sectors) |
7a6cba61 | 1734 | { |
ce1a14dc PB |
1735 | int async_ret; |
1736 | BlockDriverAIOCB *acb; | |
f141eafe AL |
1737 | struct iovec iov; |
1738 | QEMUIOVector qiov; | |
83f64091 | 1739 | |
65d6b3d8 KW |
1740 | async_context_push(); |
1741 | ||
83f64091 | 1742 | async_ret = NOT_DONE; |
3f4cb3d3 | 1743 | iov.iov_base = (void *)buf; |
f141eafe AL |
1744 | iov.iov_len = nb_sectors * 512; |
1745 | qemu_iovec_init_external(&qiov, &iov, 1); | |
1746 | acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors, | |
1747 | bdrv_rw_em_cb, &async_ret); | |
65d6b3d8 KW |
1748 | if (acb == NULL) { |
1749 | async_ret = -1; | |
1750 | goto fail; | |
1751 | } | |
baf35cb9 | 1752 | |
83f64091 FB |
1753 | while (async_ret == NOT_DONE) { |
1754 | qemu_aio_wait(); | |
1755 | } | |
baf35cb9 | 1756 | |
65d6b3d8 KW |
1757 | |
1758 | fail: | |
1759 | async_context_pop(); | |
83f64091 | 1760 | return async_ret; |
7a6cba61 PB |
1761 | } |
1762 | ||
83f64091 FB |
1763 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
1764 | const uint8_t *buf, int nb_sectors) | |
1765 | { | |
ce1a14dc PB |
1766 | int async_ret; |
1767 | BlockDriverAIOCB *acb; | |
f141eafe AL |
1768 | struct iovec iov; |
1769 | QEMUIOVector qiov; | |
83f64091 | 1770 | |
65d6b3d8 KW |
1771 | async_context_push(); |
1772 | ||
83f64091 | 1773 | async_ret = NOT_DONE; |
f141eafe AL |
1774 | iov.iov_base = (void *)buf; |
1775 | iov.iov_len = nb_sectors * 512; | |
1776 | qemu_iovec_init_external(&qiov, &iov, 1); | |
1777 | acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors, | |
1778 | bdrv_rw_em_cb, &async_ret); | |
65d6b3d8 KW |
1779 | if (acb == NULL) { |
1780 | async_ret = -1; | |
1781 | goto fail; | |
1782 | } | |
83f64091 FB |
1783 | while (async_ret == NOT_DONE) { |
1784 | qemu_aio_wait(); | |
1785 | } | |
65d6b3d8 KW |
1786 | |
1787 | fail: | |
1788 | async_context_pop(); | |
83f64091 FB |
1789 | return async_ret; |
1790 | } | |
ea2384d3 FB |
1791 | |
1792 | void bdrv_init(void) | |
1793 | { | |
5efa9d5a | 1794 | module_call_init(MODULE_INIT_BLOCK); |
ea2384d3 | 1795 | } |
ce1a14dc | 1796 | |
eb852011 MA |
1797 | void bdrv_init_with_whitelist(void) |
1798 | { | |
1799 | use_bdrv_whitelist = 1; | |
1800 | bdrv_init(); | |
1801 | } | |
1802 | ||
c16b5a2c CH |
1803 | void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs, |
1804 | BlockDriverCompletionFunc *cb, void *opaque) | |
ce1a14dc | 1805 | { |
ce1a14dc PB |
1806 | BlockDriverAIOCB *acb; |
1807 | ||
6bbff9a0 AL |
1808 | if (pool->free_aiocb) { |
1809 | acb = pool->free_aiocb; | |
1810 | pool->free_aiocb = acb->next; | |
ce1a14dc | 1811 | } else { |
6bbff9a0 AL |
1812 | acb = qemu_mallocz(pool->aiocb_size); |
1813 | acb->pool = pool; | |
ce1a14dc PB |
1814 | } |
1815 | acb->bs = bs; | |
1816 | acb->cb = cb; | |
1817 | acb->opaque = opaque; | |
1818 | return acb; | |
1819 | } | |
1820 | ||
1821 | void qemu_aio_release(void *p) | |
1822 | { | |
6bbff9a0 AL |
1823 | BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; |
1824 | AIOPool *pool = acb->pool; | |
1825 | acb->next = pool->free_aiocb; | |
1826 | pool->free_aiocb = acb; | |
ce1a14dc | 1827 | } |
19cb3738 FB |
1828 | |
1829 | /**************************************************************/ | |
1830 | /* removable device support */ | |
1831 | ||
1832 | /** | |
1833 | * Return TRUE if the media is present | |
1834 | */ | |
1835 | int bdrv_is_inserted(BlockDriverState *bs) | |
1836 | { | |
1837 | BlockDriver *drv = bs->drv; | |
1838 | int ret; | |
1839 | if (!drv) | |
1840 | return 0; | |
1841 | if (!drv->bdrv_is_inserted) | |
1842 | return 1; | |
1843 | ret = drv->bdrv_is_inserted(bs); | |
1844 | return ret; | |
1845 | } | |
1846 | ||
1847 | /** | |
1848 | * Return TRUE if the media changed since the last call to this | |
5fafdf24 | 1849 | * function. It is currently only used for floppy disks |
19cb3738 FB |
1850 | */ |
1851 | int bdrv_media_changed(BlockDriverState *bs) | |
1852 | { | |
1853 | BlockDriver *drv = bs->drv; | |
1854 | int ret; | |
1855 | ||
1856 | if (!drv || !drv->bdrv_media_changed) | |
1857 | ret = -ENOTSUP; | |
1858 | else | |
1859 | ret = drv->bdrv_media_changed(bs); | |
1860 | if (ret == -ENOTSUP) | |
1861 | ret = bs->media_changed; | |
1862 | bs->media_changed = 0; | |
1863 | return ret; | |
1864 | } | |
1865 | ||
1866 | /** | |
1867 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
1868 | */ | |
aea2a33c | 1869 | int bdrv_eject(BlockDriverState *bs, int eject_flag) |
19cb3738 FB |
1870 | { |
1871 | BlockDriver *drv = bs->drv; | |
1872 | int ret; | |
1873 | ||
aea2a33c MM |
1874 | if (bs->locked) { |
1875 | return -EBUSY; | |
1876 | } | |
1877 | ||
19cb3738 FB |
1878 | if (!drv || !drv->bdrv_eject) { |
1879 | ret = -ENOTSUP; | |
1880 | } else { | |
1881 | ret = drv->bdrv_eject(bs, eject_flag); | |
1882 | } | |
1883 | if (ret == -ENOTSUP) { | |
1884 | if (eject_flag) | |
1885 | bdrv_close(bs); | |
aea2a33c | 1886 | ret = 0; |
19cb3738 | 1887 | } |
aea2a33c MM |
1888 | |
1889 | return ret; | |
19cb3738 FB |
1890 | } |
1891 | ||
1892 | int bdrv_is_locked(BlockDriverState *bs) | |
1893 | { | |
1894 | return bs->locked; | |
1895 | } | |
1896 | ||
1897 | /** | |
1898 | * Lock or unlock the media (if it is locked, the user won't be able | |
1899 | * to eject it manually). | |
1900 | */ | |
1901 | void bdrv_set_locked(BlockDriverState *bs, int locked) | |
1902 | { | |
1903 | BlockDriver *drv = bs->drv; | |
1904 | ||
1905 | bs->locked = locked; | |
1906 | if (drv && drv->bdrv_set_locked) { | |
1907 | drv->bdrv_set_locked(bs, locked); | |
1908 | } | |
1909 | } | |
985a03b0 TS |
1910 | |
1911 | /* needed for generic scsi interface */ | |
1912 | ||
1913 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
1914 | { | |
1915 | BlockDriver *drv = bs->drv; | |
1916 | ||
1917 | if (drv && drv->bdrv_ioctl) | |
1918 | return drv->bdrv_ioctl(bs, req, buf); | |
1919 | return -ENOTSUP; | |
1920 | } | |
7d780669 | 1921 | |
221f715d AL |
1922 | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
1923 | unsigned long int req, void *buf, | |
1924 | BlockDriverCompletionFunc *cb, void *opaque) | |
7d780669 | 1925 | { |
221f715d | 1926 | BlockDriver *drv = bs->drv; |
7d780669 | 1927 | |
221f715d AL |
1928 | if (drv && drv->bdrv_aio_ioctl) |
1929 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); | |
1930 | return NULL; | |
7d780669 | 1931 | } |
e268ca52 AL |
1932 | |
1933 | void *qemu_blockalign(BlockDriverState *bs, size_t size) | |
1934 | { | |
1935 | return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); | |
1936 | } |