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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" |
6d519a5f | 26 | #include "trace.h" |
376253ec | 27 | #include "monitor.h" |
ea2384d3 | 28 | #include "block_int.h" |
5efa9d5a | 29 | #include "module.h" |
d15e5465 | 30 | #include "qemu-objects.h" |
fc01f7e7 | 31 | |
71e72a19 | 32 | #ifdef CONFIG_BSD |
7674e7bf FB |
33 | #include <sys/types.h> |
34 | #include <sys/stat.h> | |
35 | #include <sys/ioctl.h> | |
72cf2d4f | 36 | #include <sys/queue.h> |
c5e97233 | 37 | #ifndef __DragonFly__ |
7674e7bf FB |
38 | #include <sys/disk.h> |
39 | #endif | |
c5e97233 | 40 | #endif |
7674e7bf | 41 | |
49dc768d AL |
42 | #ifdef _WIN32 |
43 | #include <windows.h> | |
44 | #endif | |
45 | ||
f141eafe AL |
46 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
47 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
c87c0672 | 48 | BlockDriverCompletionFunc *cb, void *opaque); |
f141eafe AL |
49 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
50 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 51 | BlockDriverCompletionFunc *cb, void *opaque); |
b2e12bc6 CH |
52 | static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, |
53 | BlockDriverCompletionFunc *cb, void *opaque); | |
016f5cf6 AG |
54 | static BlockDriverAIOCB *bdrv_aio_noop_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 | |
1b7bdbc1 SH |
61 | static QTAILQ_HEAD(, BlockDriverState) bdrv_states = |
62 | QTAILQ_HEAD_INITIALIZER(bdrv_states); | |
7ee930d0 | 63 | |
8a22f02a SH |
64 | static QLIST_HEAD(, BlockDriver) bdrv_drivers = |
65 | QLIST_HEAD_INITIALIZER(bdrv_drivers); | |
ea2384d3 | 66 | |
f9092b10 MA |
67 | /* The device to use for VM snapshots */ |
68 | static BlockDriverState *bs_snapshots; | |
69 | ||
eb852011 MA |
70 | /* If non-zero, use only whitelisted block drivers */ |
71 | static int use_bdrv_whitelist; | |
72 | ||
9e0b22f4 SH |
73 | #ifdef _WIN32 |
74 | static int is_windows_drive_prefix(const char *filename) | |
75 | { | |
76 | return (((filename[0] >= 'a' && filename[0] <= 'z') || | |
77 | (filename[0] >= 'A' && filename[0] <= 'Z')) && | |
78 | filename[1] == ':'); | |
79 | } | |
80 | ||
81 | int is_windows_drive(const char *filename) | |
82 | { | |
83 | if (is_windows_drive_prefix(filename) && | |
84 | filename[2] == '\0') | |
85 | return 1; | |
86 | if (strstart(filename, "\\\\.\\", NULL) || | |
87 | strstart(filename, "//./", NULL)) | |
88 | return 1; | |
89 | return 0; | |
90 | } | |
91 | #endif | |
92 | ||
93 | /* check if the path starts with "<protocol>:" */ | |
94 | static int path_has_protocol(const char *path) | |
95 | { | |
96 | #ifdef _WIN32 | |
97 | if (is_windows_drive(path) || | |
98 | is_windows_drive_prefix(path)) { | |
99 | return 0; | |
100 | } | |
101 | #endif | |
102 | ||
103 | return strchr(path, ':') != NULL; | |
104 | } | |
105 | ||
83f64091 | 106 | int path_is_absolute(const char *path) |
3b0d4f61 | 107 | { |
83f64091 | 108 | const char *p; |
21664424 FB |
109 | #ifdef _WIN32 |
110 | /* specific case for names like: "\\.\d:" */ | |
111 | if (*path == '/' || *path == '\\') | |
112 | return 1; | |
113 | #endif | |
83f64091 FB |
114 | p = strchr(path, ':'); |
115 | if (p) | |
116 | p++; | |
117 | else | |
118 | p = path; | |
3b9f94e1 FB |
119 | #ifdef _WIN32 |
120 | return (*p == '/' || *p == '\\'); | |
121 | #else | |
122 | return (*p == '/'); | |
123 | #endif | |
3b0d4f61 FB |
124 | } |
125 | ||
83f64091 FB |
126 | /* if filename is absolute, just copy it to dest. Otherwise, build a |
127 | path to it by considering it is relative to base_path. URL are | |
128 | supported. */ | |
129 | void path_combine(char *dest, int dest_size, | |
130 | const char *base_path, | |
131 | const char *filename) | |
3b0d4f61 | 132 | { |
83f64091 FB |
133 | const char *p, *p1; |
134 | int len; | |
135 | ||
136 | if (dest_size <= 0) | |
137 | return; | |
138 | if (path_is_absolute(filename)) { | |
139 | pstrcpy(dest, dest_size, filename); | |
140 | } else { | |
141 | p = strchr(base_path, ':'); | |
142 | if (p) | |
143 | p++; | |
144 | else | |
145 | p = base_path; | |
3b9f94e1 FB |
146 | p1 = strrchr(base_path, '/'); |
147 | #ifdef _WIN32 | |
148 | { | |
149 | const char *p2; | |
150 | p2 = strrchr(base_path, '\\'); | |
151 | if (!p1 || p2 > p1) | |
152 | p1 = p2; | |
153 | } | |
154 | #endif | |
83f64091 FB |
155 | if (p1) |
156 | p1++; | |
157 | else | |
158 | p1 = base_path; | |
159 | if (p1 > p) | |
160 | p = p1; | |
161 | len = p - base_path; | |
162 | if (len > dest_size - 1) | |
163 | len = dest_size - 1; | |
164 | memcpy(dest, base_path, len); | |
165 | dest[len] = '\0'; | |
166 | pstrcat(dest, dest_size, filename); | |
3b0d4f61 | 167 | } |
3b0d4f61 FB |
168 | } |
169 | ||
5efa9d5a | 170 | void bdrv_register(BlockDriver *bdrv) |
ea2384d3 | 171 | { |
f141eafe | 172 | if (!bdrv->bdrv_aio_readv) { |
83f64091 | 173 | /* add AIO emulation layer */ |
f141eafe AL |
174 | bdrv->bdrv_aio_readv = bdrv_aio_readv_em; |
175 | bdrv->bdrv_aio_writev = bdrv_aio_writev_em; | |
eda578e5 | 176 | } else if (!bdrv->bdrv_read) { |
83f64091 FB |
177 | /* add synchronous IO emulation layer */ |
178 | bdrv->bdrv_read = bdrv_read_em; | |
179 | bdrv->bdrv_write = bdrv_write_em; | |
180 | } | |
b2e12bc6 CH |
181 | |
182 | if (!bdrv->bdrv_aio_flush) | |
183 | bdrv->bdrv_aio_flush = bdrv_aio_flush_em; | |
184 | ||
8a22f02a | 185 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
ea2384d3 | 186 | } |
b338082b FB |
187 | |
188 | /* create a new block device (by default it is empty) */ | |
189 | BlockDriverState *bdrv_new(const char *device_name) | |
190 | { | |
1b7bdbc1 | 191 | BlockDriverState *bs; |
b338082b FB |
192 | |
193 | bs = qemu_mallocz(sizeof(BlockDriverState)); | |
b338082b | 194 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); |
ea2384d3 | 195 | if (device_name[0] != '\0') { |
1b7bdbc1 | 196 | QTAILQ_INSERT_TAIL(&bdrv_states, bs, list); |
ea2384d3 | 197 | } |
b338082b FB |
198 | return bs; |
199 | } | |
200 | ||
ea2384d3 FB |
201 | BlockDriver *bdrv_find_format(const char *format_name) |
202 | { | |
203 | BlockDriver *drv1; | |
8a22f02a SH |
204 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
205 | if (!strcmp(drv1->format_name, format_name)) { | |
ea2384d3 | 206 | return drv1; |
8a22f02a | 207 | } |
ea2384d3 FB |
208 | } |
209 | return NULL; | |
210 | } | |
211 | ||
eb852011 MA |
212 | static int bdrv_is_whitelisted(BlockDriver *drv) |
213 | { | |
214 | static const char *whitelist[] = { | |
215 | CONFIG_BDRV_WHITELIST | |
216 | }; | |
217 | const char **p; | |
218 | ||
219 | if (!whitelist[0]) | |
220 | return 1; /* no whitelist, anything goes */ | |
221 | ||
222 | for (p = whitelist; *p; p++) { | |
223 | if (!strcmp(drv->format_name, *p)) { | |
224 | return 1; | |
225 | } | |
226 | } | |
227 | return 0; | |
228 | } | |
229 | ||
230 | BlockDriver *bdrv_find_whitelisted_format(const char *format_name) | |
231 | { | |
232 | BlockDriver *drv = bdrv_find_format(format_name); | |
233 | return drv && bdrv_is_whitelisted(drv) ? drv : NULL; | |
234 | } | |
235 | ||
0e7e1989 KW |
236 | int bdrv_create(BlockDriver *drv, const char* filename, |
237 | QEMUOptionParameter *options) | |
ea2384d3 FB |
238 | { |
239 | if (!drv->bdrv_create) | |
240 | return -ENOTSUP; | |
0e7e1989 KW |
241 | |
242 | return drv->bdrv_create(filename, options); | |
ea2384d3 FB |
243 | } |
244 | ||
84a12e66 CH |
245 | int bdrv_create_file(const char* filename, QEMUOptionParameter *options) |
246 | { | |
247 | BlockDriver *drv; | |
248 | ||
b50cbabc | 249 | drv = bdrv_find_protocol(filename); |
84a12e66 | 250 | if (drv == NULL) { |
16905d71 | 251 | return -ENOENT; |
84a12e66 CH |
252 | } |
253 | ||
254 | return bdrv_create(drv, filename, options); | |
255 | } | |
256 | ||
d5249393 | 257 | #ifdef _WIN32 |
95389c86 | 258 | void get_tmp_filename(char *filename, int size) |
d5249393 | 259 | { |
3b9f94e1 | 260 | char temp_dir[MAX_PATH]; |
3b46e624 | 261 | |
3b9f94e1 FB |
262 | GetTempPath(MAX_PATH, temp_dir); |
263 | GetTempFileName(temp_dir, "qem", 0, filename); | |
d5249393 FB |
264 | } |
265 | #else | |
95389c86 | 266 | void get_tmp_filename(char *filename, int size) |
fc01f7e7 | 267 | { |
67b915a5 | 268 | int fd; |
7ccfb2eb | 269 | const char *tmpdir; |
d5249393 | 270 | /* XXX: race condition possible */ |
0badc1ee AJ |
271 | tmpdir = getenv("TMPDIR"); |
272 | if (!tmpdir) | |
273 | tmpdir = "/tmp"; | |
274 | snprintf(filename, size, "%s/vl.XXXXXX", tmpdir); | |
ea2384d3 FB |
275 | fd = mkstemp(filename); |
276 | close(fd); | |
277 | } | |
d5249393 | 278 | #endif |
fc01f7e7 | 279 | |
84a12e66 CH |
280 | /* |
281 | * Detect host devices. By convention, /dev/cdrom[N] is always | |
282 | * recognized as a host CDROM. | |
283 | */ | |
284 | static BlockDriver *find_hdev_driver(const char *filename) | |
285 | { | |
286 | int score_max = 0, score; | |
287 | BlockDriver *drv = NULL, *d; | |
288 | ||
289 | QLIST_FOREACH(d, &bdrv_drivers, list) { | |
290 | if (d->bdrv_probe_device) { | |
291 | score = d->bdrv_probe_device(filename); | |
292 | if (score > score_max) { | |
293 | score_max = score; | |
294 | drv = d; | |
295 | } | |
296 | } | |
297 | } | |
298 | ||
299 | return drv; | |
300 | } | |
301 | ||
b50cbabc | 302 | BlockDriver *bdrv_find_protocol(const char *filename) |
83f64091 FB |
303 | { |
304 | BlockDriver *drv1; | |
305 | char protocol[128]; | |
1cec71e3 | 306 | int len; |
83f64091 | 307 | const char *p; |
19cb3738 | 308 | |
66f82cee KW |
309 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ |
310 | ||
39508e7a CH |
311 | /* |
312 | * XXX(hch): we really should not let host device detection | |
313 | * override an explicit protocol specification, but moving this | |
314 | * later breaks access to device names with colons in them. | |
315 | * Thanks to the brain-dead persistent naming schemes on udev- | |
316 | * based Linux systems those actually are quite common. | |
317 | */ | |
318 | drv1 = find_hdev_driver(filename); | |
319 | if (drv1) { | |
320 | return drv1; | |
321 | } | |
322 | ||
9e0b22f4 | 323 | if (!path_has_protocol(filename)) { |
39508e7a | 324 | return bdrv_find_format("file"); |
84a12e66 | 325 | } |
9e0b22f4 SH |
326 | p = strchr(filename, ':'); |
327 | assert(p != NULL); | |
1cec71e3 AL |
328 | len = p - filename; |
329 | if (len > sizeof(protocol) - 1) | |
330 | len = sizeof(protocol) - 1; | |
331 | memcpy(protocol, filename, len); | |
332 | protocol[len] = '\0'; | |
8a22f02a | 333 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
5fafdf24 | 334 | if (drv1->protocol_name && |
8a22f02a | 335 | !strcmp(drv1->protocol_name, protocol)) { |
83f64091 | 336 | return drv1; |
8a22f02a | 337 | } |
83f64091 FB |
338 | } |
339 | return NULL; | |
340 | } | |
341 | ||
c98ac35d | 342 | static int find_image_format(const char *filename, BlockDriver **pdrv) |
f3a5d3f8 CH |
343 | { |
344 | int ret, score, score_max; | |
345 | BlockDriver *drv1, *drv; | |
346 | uint8_t buf[2048]; | |
347 | BlockDriverState *bs; | |
348 | ||
f5edb014 | 349 | ret = bdrv_file_open(&bs, filename, 0); |
c98ac35d SW |
350 | if (ret < 0) { |
351 | *pdrv = NULL; | |
352 | return ret; | |
353 | } | |
f8ea0b00 | 354 | |
08a00559 KW |
355 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ |
356 | if (bs->sg || !bdrv_is_inserted(bs)) { | |
1a396859 | 357 | bdrv_delete(bs); |
c98ac35d SW |
358 | drv = bdrv_find_format("raw"); |
359 | if (!drv) { | |
360 | ret = -ENOENT; | |
361 | } | |
362 | *pdrv = drv; | |
363 | return ret; | |
1a396859 | 364 | } |
f8ea0b00 | 365 | |
83f64091 FB |
366 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
367 | bdrv_delete(bs); | |
368 | if (ret < 0) { | |
c98ac35d SW |
369 | *pdrv = NULL; |
370 | return ret; | |
83f64091 FB |
371 | } |
372 | ||
ea2384d3 | 373 | score_max = 0; |
84a12e66 | 374 | drv = NULL; |
8a22f02a | 375 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
83f64091 FB |
376 | if (drv1->bdrv_probe) { |
377 | score = drv1->bdrv_probe(buf, ret, filename); | |
378 | if (score > score_max) { | |
379 | score_max = score; | |
380 | drv = drv1; | |
381 | } | |
0849bf08 | 382 | } |
fc01f7e7 | 383 | } |
c98ac35d SW |
384 | if (!drv) { |
385 | ret = -ENOENT; | |
386 | } | |
387 | *pdrv = drv; | |
388 | return ret; | |
ea2384d3 FB |
389 | } |
390 | ||
51762288 SH |
391 | /** |
392 | * Set the current 'total_sectors' value | |
393 | */ | |
394 | static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) | |
395 | { | |
396 | BlockDriver *drv = bs->drv; | |
397 | ||
396759ad NB |
398 | /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */ |
399 | if (bs->sg) | |
400 | return 0; | |
401 | ||
51762288 SH |
402 | /* query actual device if possible, otherwise just trust the hint */ |
403 | if (drv->bdrv_getlength) { | |
404 | int64_t length = drv->bdrv_getlength(bs); | |
405 | if (length < 0) { | |
406 | return length; | |
407 | } | |
408 | hint = length >> BDRV_SECTOR_BITS; | |
409 | } | |
410 | ||
411 | bs->total_sectors = hint; | |
412 | return 0; | |
413 | } | |
414 | ||
57915332 KW |
415 | /* |
416 | * Common part for opening disk images and files | |
417 | */ | |
418 | static int bdrv_open_common(BlockDriverState *bs, const char *filename, | |
419 | int flags, BlockDriver *drv) | |
420 | { | |
421 | int ret, open_flags; | |
422 | ||
423 | assert(drv != NULL); | |
424 | ||
66f82cee | 425 | bs->file = NULL; |
51762288 | 426 | bs->total_sectors = 0; |
57915332 KW |
427 | bs->encrypted = 0; |
428 | bs->valid_key = 0; | |
429 | bs->open_flags = flags; | |
430 | /* buffer_alignment defaulted to 512, drivers can change this value */ | |
431 | bs->buffer_alignment = 512; | |
432 | ||
433 | pstrcpy(bs->filename, sizeof(bs->filename), filename); | |
434 | ||
435 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) { | |
436 | return -ENOTSUP; | |
437 | } | |
438 | ||
439 | bs->drv = drv; | |
440 | bs->opaque = qemu_mallocz(drv->instance_size); | |
441 | ||
a6599793 | 442 | if (flags & BDRV_O_CACHE_WB) |
57915332 KW |
443 | bs->enable_write_cache = 1; |
444 | ||
445 | /* | |
446 | * Clear flags that are internal to the block layer before opening the | |
447 | * image. | |
448 | */ | |
449 | open_flags = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
450 | ||
451 | /* | |
ebabb67a | 452 | * Snapshots should be writable. |
57915332 KW |
453 | */ |
454 | if (bs->is_temporary) { | |
455 | open_flags |= BDRV_O_RDWR; | |
456 | } | |
457 | ||
66f82cee KW |
458 | /* Open the image, either directly or using a protocol */ |
459 | if (drv->bdrv_file_open) { | |
460 | ret = drv->bdrv_file_open(bs, filename, open_flags); | |
461 | } else { | |
462 | ret = bdrv_file_open(&bs->file, filename, open_flags); | |
463 | if (ret >= 0) { | |
464 | ret = drv->bdrv_open(bs, open_flags); | |
465 | } | |
466 | } | |
467 | ||
57915332 KW |
468 | if (ret < 0) { |
469 | goto free_and_fail; | |
470 | } | |
471 | ||
472 | bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR); | |
51762288 SH |
473 | |
474 | ret = refresh_total_sectors(bs, bs->total_sectors); | |
475 | if (ret < 0) { | |
476 | goto free_and_fail; | |
57915332 | 477 | } |
51762288 | 478 | |
57915332 KW |
479 | #ifndef _WIN32 |
480 | if (bs->is_temporary) { | |
481 | unlink(filename); | |
482 | } | |
483 | #endif | |
484 | return 0; | |
485 | ||
486 | free_and_fail: | |
66f82cee KW |
487 | if (bs->file) { |
488 | bdrv_delete(bs->file); | |
489 | bs->file = NULL; | |
490 | } | |
57915332 KW |
491 | qemu_free(bs->opaque); |
492 | bs->opaque = NULL; | |
493 | bs->drv = NULL; | |
494 | return ret; | |
495 | } | |
496 | ||
b6ce07aa KW |
497 | /* |
498 | * Opens a file using a protocol (file, host_device, nbd, ...) | |
499 | */ | |
83f64091 | 500 | int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
ea2384d3 | 501 | { |
83f64091 | 502 | BlockDriverState *bs; |
6db95603 | 503 | BlockDriver *drv; |
83f64091 FB |
504 | int ret; |
505 | ||
b50cbabc | 506 | drv = bdrv_find_protocol(filename); |
6db95603 CH |
507 | if (!drv) { |
508 | return -ENOENT; | |
509 | } | |
510 | ||
83f64091 | 511 | bs = bdrv_new(""); |
b6ce07aa | 512 | ret = bdrv_open_common(bs, filename, flags, drv); |
83f64091 FB |
513 | if (ret < 0) { |
514 | bdrv_delete(bs); | |
515 | return ret; | |
3b0d4f61 | 516 | } |
71d0770c | 517 | bs->growable = 1; |
83f64091 FB |
518 | *pbs = bs; |
519 | return 0; | |
520 | } | |
521 | ||
b6ce07aa KW |
522 | /* |
523 | * Opens a disk image (raw, qcow2, vmdk, ...) | |
524 | */ | |
d6e9098e KW |
525 | int bdrv_open(BlockDriverState *bs, const char *filename, int flags, |
526 | BlockDriver *drv) | |
ea2384d3 | 527 | { |
b6ce07aa | 528 | int ret; |
712e7874 | 529 | |
83f64091 | 530 | if (flags & BDRV_O_SNAPSHOT) { |
ea2384d3 FB |
531 | BlockDriverState *bs1; |
532 | int64_t total_size; | |
7c96d46e | 533 | int is_protocol = 0; |
91a073a9 KW |
534 | BlockDriver *bdrv_qcow2; |
535 | QEMUOptionParameter *options; | |
b6ce07aa KW |
536 | char tmp_filename[PATH_MAX]; |
537 | char backing_filename[PATH_MAX]; | |
3b46e624 | 538 | |
ea2384d3 FB |
539 | /* if snapshot, we create a temporary backing file and open it |
540 | instead of opening 'filename' directly */ | |
33e3963e | 541 | |
ea2384d3 FB |
542 | /* if there is a backing file, use it */ |
543 | bs1 = bdrv_new(""); | |
d6e9098e | 544 | ret = bdrv_open(bs1, filename, 0, drv); |
51d7c00c | 545 | if (ret < 0) { |
ea2384d3 | 546 | bdrv_delete(bs1); |
51d7c00c | 547 | return ret; |
ea2384d3 | 548 | } |
3e82990b | 549 | total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK; |
7c96d46e AL |
550 | |
551 | if (bs1->drv && bs1->drv->protocol_name) | |
552 | is_protocol = 1; | |
553 | ||
ea2384d3 | 554 | bdrv_delete(bs1); |
3b46e624 | 555 | |
ea2384d3 | 556 | get_tmp_filename(tmp_filename, sizeof(tmp_filename)); |
7c96d46e AL |
557 | |
558 | /* Real path is meaningless for protocols */ | |
559 | if (is_protocol) | |
560 | snprintf(backing_filename, sizeof(backing_filename), | |
561 | "%s", filename); | |
114cdfa9 KS |
562 | else if (!realpath(filename, backing_filename)) |
563 | return -errno; | |
7c96d46e | 564 | |
91a073a9 KW |
565 | bdrv_qcow2 = bdrv_find_format("qcow2"); |
566 | options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); | |
567 | ||
3e82990b | 568 | set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size); |
91a073a9 KW |
569 | set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); |
570 | if (drv) { | |
571 | set_option_parameter(options, BLOCK_OPT_BACKING_FMT, | |
572 | drv->format_name); | |
573 | } | |
574 | ||
575 | ret = bdrv_create(bdrv_qcow2, tmp_filename, options); | |
d748768c | 576 | free_option_parameters(options); |
51d7c00c AL |
577 | if (ret < 0) { |
578 | return ret; | |
ea2384d3 | 579 | } |
91a073a9 | 580 | |
ea2384d3 | 581 | filename = tmp_filename; |
91a073a9 | 582 | drv = bdrv_qcow2; |
ea2384d3 FB |
583 | bs->is_temporary = 1; |
584 | } | |
712e7874 | 585 | |
b6ce07aa | 586 | /* Find the right image format driver */ |
6db95603 | 587 | if (!drv) { |
c98ac35d | 588 | ret = find_image_format(filename, &drv); |
51d7c00c | 589 | } |
6987307c | 590 | |
51d7c00c | 591 | if (!drv) { |
51d7c00c | 592 | goto unlink_and_fail; |
ea2384d3 | 593 | } |
b6ce07aa KW |
594 | |
595 | /* Open the image */ | |
596 | ret = bdrv_open_common(bs, filename, flags, drv); | |
597 | if (ret < 0) { | |
6987307c CH |
598 | goto unlink_and_fail; |
599 | } | |
600 | ||
b6ce07aa KW |
601 | /* If there is a backing file, use it */ |
602 | if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') { | |
603 | char backing_filename[PATH_MAX]; | |
604 | int back_flags; | |
605 | BlockDriver *back_drv = NULL; | |
606 | ||
607 | bs->backing_hd = bdrv_new(""); | |
df2dbb4a SH |
608 | |
609 | if (path_has_protocol(bs->backing_file)) { | |
610 | pstrcpy(backing_filename, sizeof(backing_filename), | |
611 | bs->backing_file); | |
612 | } else { | |
613 | path_combine(backing_filename, sizeof(backing_filename), | |
614 | filename, bs->backing_file); | |
615 | } | |
616 | ||
617 | if (bs->backing_format[0] != '\0') { | |
b6ce07aa | 618 | back_drv = bdrv_find_format(bs->backing_format); |
df2dbb4a | 619 | } |
b6ce07aa KW |
620 | |
621 | /* backing files always opened read-only */ | |
622 | back_flags = | |
623 | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
624 | ||
625 | ret = bdrv_open(bs->backing_hd, backing_filename, back_flags, back_drv); | |
626 | if (ret < 0) { | |
627 | bdrv_close(bs); | |
628 | return ret; | |
629 | } | |
630 | if (bs->is_temporary) { | |
631 | bs->backing_hd->keep_read_only = !(flags & BDRV_O_RDWR); | |
632 | } else { | |
633 | /* base image inherits from "parent" */ | |
634 | bs->backing_hd->keep_read_only = bs->keep_read_only; | |
635 | } | |
636 | } | |
637 | ||
638 | if (!bdrv_key_required(bs)) { | |
639 | /* call the change callback */ | |
640 | bs->media_changed = 1; | |
641 | if (bs->change_cb) | |
db97ee6a | 642 | bs->change_cb(bs->change_opaque, CHANGE_MEDIA); |
b6ce07aa KW |
643 | } |
644 | ||
645 | return 0; | |
646 | ||
647 | unlink_and_fail: | |
648 | if (bs->is_temporary) { | |
649 | unlink(filename); | |
650 | } | |
651 | return ret; | |
652 | } | |
653 | ||
fc01f7e7 FB |
654 | void bdrv_close(BlockDriverState *bs) |
655 | { | |
19cb3738 | 656 | if (bs->drv) { |
f9092b10 MA |
657 | if (bs == bs_snapshots) { |
658 | bs_snapshots = NULL; | |
659 | } | |
557df6ac | 660 | if (bs->backing_hd) { |
ea2384d3 | 661 | bdrv_delete(bs->backing_hd); |
557df6ac SH |
662 | bs->backing_hd = NULL; |
663 | } | |
ea2384d3 FB |
664 | bs->drv->bdrv_close(bs); |
665 | qemu_free(bs->opaque); | |
666 | #ifdef _WIN32 | |
667 | if (bs->is_temporary) { | |
668 | unlink(bs->filename); | |
669 | } | |
67b915a5 | 670 | #endif |
ea2384d3 FB |
671 | bs->opaque = NULL; |
672 | bs->drv = NULL; | |
b338082b | 673 | |
66f82cee KW |
674 | if (bs->file != NULL) { |
675 | bdrv_close(bs->file); | |
676 | } | |
677 | ||
b338082b | 678 | /* call the change callback */ |
19cb3738 | 679 | bs->media_changed = 1; |
b338082b | 680 | if (bs->change_cb) |
db97ee6a | 681 | bs->change_cb(bs->change_opaque, CHANGE_MEDIA); |
b338082b FB |
682 | } |
683 | } | |
684 | ||
2bc93fed MK |
685 | void bdrv_close_all(void) |
686 | { | |
687 | BlockDriverState *bs; | |
688 | ||
689 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
690 | bdrv_close(bs); | |
691 | } | |
692 | } | |
693 | ||
d22b2f41 RH |
694 | /* make a BlockDriverState anonymous by removing from bdrv_state list. |
695 | Also, NULL terminate the device_name to prevent double remove */ | |
696 | void bdrv_make_anon(BlockDriverState *bs) | |
697 | { | |
698 | if (bs->device_name[0] != '\0') { | |
699 | QTAILQ_REMOVE(&bdrv_states, bs, list); | |
700 | } | |
701 | bs->device_name[0] = '\0'; | |
702 | } | |
703 | ||
b338082b FB |
704 | void bdrv_delete(BlockDriverState *bs) |
705 | { | |
18846dee MA |
706 | assert(!bs->peer); |
707 | ||
1b7bdbc1 | 708 | /* remove from list, if necessary */ |
d22b2f41 | 709 | bdrv_make_anon(bs); |
34c6f050 | 710 | |
b338082b | 711 | bdrv_close(bs); |
66f82cee KW |
712 | if (bs->file != NULL) { |
713 | bdrv_delete(bs->file); | |
714 | } | |
715 | ||
f9092b10 | 716 | assert(bs != bs_snapshots); |
b338082b | 717 | qemu_free(bs); |
fc01f7e7 FB |
718 | } |
719 | ||
18846dee MA |
720 | int bdrv_attach(BlockDriverState *bs, DeviceState *qdev) |
721 | { | |
722 | if (bs->peer) { | |
723 | return -EBUSY; | |
724 | } | |
725 | bs->peer = qdev; | |
726 | return 0; | |
727 | } | |
728 | ||
729 | void bdrv_detach(BlockDriverState *bs, DeviceState *qdev) | |
730 | { | |
731 | assert(bs->peer == qdev); | |
732 | bs->peer = NULL; | |
a19712b0 MA |
733 | bs->change_cb = NULL; |
734 | bs->change_opaque = NULL; | |
18846dee MA |
735 | } |
736 | ||
737 | DeviceState *bdrv_get_attached(BlockDriverState *bs) | |
738 | { | |
739 | return bs->peer; | |
740 | } | |
741 | ||
e97fc193 AL |
742 | /* |
743 | * Run consistency checks on an image | |
744 | * | |
e076f338 | 745 | * Returns 0 if the check could be completed (it doesn't mean that the image is |
a1c7273b | 746 | * free of errors) or -errno when an internal error occurred. The results of the |
e076f338 | 747 | * check are stored in res. |
e97fc193 | 748 | */ |
e076f338 | 749 | int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res) |
e97fc193 AL |
750 | { |
751 | if (bs->drv->bdrv_check == NULL) { | |
752 | return -ENOTSUP; | |
753 | } | |
754 | ||
e076f338 | 755 | memset(res, 0, sizeof(*res)); |
9ac228e0 | 756 | return bs->drv->bdrv_check(bs, res); |
e97fc193 AL |
757 | } |
758 | ||
8a426614 KW |
759 | #define COMMIT_BUF_SECTORS 2048 |
760 | ||
33e3963e FB |
761 | /* commit COW file into the raw image */ |
762 | int bdrv_commit(BlockDriverState *bs) | |
763 | { | |
19cb3738 | 764 | BlockDriver *drv = bs->drv; |
ee181196 | 765 | BlockDriver *backing_drv; |
8a426614 KW |
766 | int64_t sector, total_sectors; |
767 | int n, ro, open_flags; | |
4dca4b63 | 768 | int ret = 0, rw_ret = 0; |
8a426614 | 769 | uint8_t *buf; |
4dca4b63 NS |
770 | char filename[1024]; |
771 | BlockDriverState *bs_rw, *bs_ro; | |
33e3963e | 772 | |
19cb3738 FB |
773 | if (!drv) |
774 | return -ENOMEDIUM; | |
4dca4b63 NS |
775 | |
776 | if (!bs->backing_hd) { | |
777 | return -ENOTSUP; | |
33e3963e FB |
778 | } |
779 | ||
4dca4b63 NS |
780 | if (bs->backing_hd->keep_read_only) { |
781 | return -EACCES; | |
782 | } | |
ee181196 KW |
783 | |
784 | backing_drv = bs->backing_hd->drv; | |
4dca4b63 NS |
785 | ro = bs->backing_hd->read_only; |
786 | strncpy(filename, bs->backing_hd->filename, sizeof(filename)); | |
787 | open_flags = bs->backing_hd->open_flags; | |
788 | ||
789 | if (ro) { | |
790 | /* re-open as RW */ | |
791 | bdrv_delete(bs->backing_hd); | |
792 | bs->backing_hd = NULL; | |
793 | bs_rw = bdrv_new(""); | |
ee181196 KW |
794 | rw_ret = bdrv_open(bs_rw, filename, open_flags | BDRV_O_RDWR, |
795 | backing_drv); | |
4dca4b63 NS |
796 | if (rw_ret < 0) { |
797 | bdrv_delete(bs_rw); | |
798 | /* try to re-open read-only */ | |
799 | bs_ro = bdrv_new(""); | |
ee181196 KW |
800 | ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, |
801 | backing_drv); | |
4dca4b63 NS |
802 | if (ret < 0) { |
803 | bdrv_delete(bs_ro); | |
804 | /* drive not functional anymore */ | |
805 | bs->drv = NULL; | |
806 | return ret; | |
807 | } | |
808 | bs->backing_hd = bs_ro; | |
809 | return rw_ret; | |
810 | } | |
811 | bs->backing_hd = bs_rw; | |
ea2384d3 | 812 | } |
33e3963e | 813 | |
6ea44308 | 814 | total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
8a426614 KW |
815 | buf = qemu_malloc(COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); |
816 | ||
817 | for (sector = 0; sector < total_sectors; sector += n) { | |
818 | if (drv->bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n)) { | |
819 | ||
820 | if (bdrv_read(bs, sector, buf, n) != 0) { | |
821 | ret = -EIO; | |
822 | goto ro_cleanup; | |
823 | } | |
824 | ||
825 | if (bdrv_write(bs->backing_hd, sector, buf, n) != 0) { | |
826 | ret = -EIO; | |
827 | goto ro_cleanup; | |
828 | } | |
ea2384d3 | 829 | } |
33e3963e | 830 | } |
95389c86 | 831 | |
1d44952f CH |
832 | if (drv->bdrv_make_empty) { |
833 | ret = drv->bdrv_make_empty(bs); | |
834 | bdrv_flush(bs); | |
835 | } | |
95389c86 | 836 | |
3f5075ae CH |
837 | /* |
838 | * Make sure all data we wrote to the backing device is actually | |
839 | * stable on disk. | |
840 | */ | |
841 | if (bs->backing_hd) | |
842 | bdrv_flush(bs->backing_hd); | |
4dca4b63 NS |
843 | |
844 | ro_cleanup: | |
8a426614 | 845 | qemu_free(buf); |
4dca4b63 NS |
846 | |
847 | if (ro) { | |
848 | /* re-open as RO */ | |
849 | bdrv_delete(bs->backing_hd); | |
850 | bs->backing_hd = NULL; | |
851 | bs_ro = bdrv_new(""); | |
ee181196 KW |
852 | ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, |
853 | backing_drv); | |
4dca4b63 NS |
854 | if (ret < 0) { |
855 | bdrv_delete(bs_ro); | |
856 | /* drive not functional anymore */ | |
857 | bs->drv = NULL; | |
858 | return ret; | |
859 | } | |
860 | bs->backing_hd = bs_ro; | |
861 | bs->backing_hd->keep_read_only = 0; | |
862 | } | |
863 | ||
1d44952f | 864 | return ret; |
33e3963e FB |
865 | } |
866 | ||
6ab4b5ab MA |
867 | void bdrv_commit_all(void) |
868 | { | |
869 | BlockDriverState *bs; | |
870 | ||
871 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
872 | bdrv_commit(bs); | |
873 | } | |
874 | } | |
875 | ||
756e6736 KW |
876 | /* |
877 | * Return values: | |
878 | * 0 - success | |
879 | * -EINVAL - backing format specified, but no file | |
880 | * -ENOSPC - can't update the backing file because no space is left in the | |
881 | * image file header | |
882 | * -ENOTSUP - format driver doesn't support changing the backing file | |
883 | */ | |
884 | int bdrv_change_backing_file(BlockDriverState *bs, | |
885 | const char *backing_file, const char *backing_fmt) | |
886 | { | |
887 | BlockDriver *drv = bs->drv; | |
888 | ||
889 | if (drv->bdrv_change_backing_file != NULL) { | |
890 | return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); | |
891 | } else { | |
892 | return -ENOTSUP; | |
893 | } | |
894 | } | |
895 | ||
71d0770c AL |
896 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
897 | size_t size) | |
898 | { | |
899 | int64_t len; | |
900 | ||
901 | if (!bdrv_is_inserted(bs)) | |
902 | return -ENOMEDIUM; | |
903 | ||
904 | if (bs->growable) | |
905 | return 0; | |
906 | ||
907 | len = bdrv_getlength(bs); | |
908 | ||
fbb7b4e0 KW |
909 | if (offset < 0) |
910 | return -EIO; | |
911 | ||
912 | if ((offset > len) || (len - offset < size)) | |
71d0770c AL |
913 | return -EIO; |
914 | ||
915 | return 0; | |
916 | } | |
917 | ||
918 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, | |
919 | int nb_sectors) | |
920 | { | |
eb5a3165 JS |
921 | return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE, |
922 | nb_sectors * BDRV_SECTOR_SIZE); | |
71d0770c AL |
923 | } |
924 | ||
19cb3738 | 925 | /* return < 0 if error. See bdrv_write() for the return codes */ |
5fafdf24 | 926 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
927 | uint8_t *buf, int nb_sectors) |
928 | { | |
ea2384d3 FB |
929 | BlockDriver *drv = bs->drv; |
930 | ||
19cb3738 FB |
931 | if (!drv) |
932 | return -ENOMEDIUM; | |
71d0770c AL |
933 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
934 | return -EIO; | |
b338082b | 935 | |
eda578e5 | 936 | return drv->bdrv_read(bs, sector_num, buf, nb_sectors); |
fc01f7e7 FB |
937 | } |
938 | ||
7cd1e32a | 939 | static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num, |
a55eb92c | 940 | int nb_sectors, int dirty) |
7cd1e32a LS |
941 | { |
942 | int64_t start, end; | |
c6d22830 | 943 | unsigned long val, idx, bit; |
a55eb92c | 944 | |
6ea44308 | 945 | start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; |
c6d22830 | 946 | end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK; |
a55eb92c JK |
947 | |
948 | for (; start <= end; start++) { | |
c6d22830 JK |
949 | idx = start / (sizeof(unsigned long) * 8); |
950 | bit = start % (sizeof(unsigned long) * 8); | |
951 | val = bs->dirty_bitmap[idx]; | |
952 | if (dirty) { | |
6d59fec1 | 953 | if (!(val & (1UL << bit))) { |
aaa0eb75 | 954 | bs->dirty_count++; |
6d59fec1 | 955 | val |= 1UL << bit; |
aaa0eb75 | 956 | } |
c6d22830 | 957 | } else { |
6d59fec1 | 958 | if (val & (1UL << bit)) { |
aaa0eb75 | 959 | bs->dirty_count--; |
6d59fec1 | 960 | val &= ~(1UL << bit); |
aaa0eb75 | 961 | } |
c6d22830 JK |
962 | } |
963 | bs->dirty_bitmap[idx] = val; | |
7cd1e32a LS |
964 | } |
965 | } | |
966 | ||
5fafdf24 | 967 | /* Return < 0 if error. Important errors are: |
19cb3738 FB |
968 | -EIO generic I/O error (may happen for all errors) |
969 | -ENOMEDIUM No media inserted. | |
970 | -EINVAL Invalid sector number or nb_sectors | |
971 | -EACCES Trying to write a read-only device | |
972 | */ | |
5fafdf24 | 973 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, |
fc01f7e7 FB |
974 | const uint8_t *buf, int nb_sectors) |
975 | { | |
83f64091 | 976 | BlockDriver *drv = bs->drv; |
19cb3738 FB |
977 | if (!bs->drv) |
978 | return -ENOMEDIUM; | |
0849bf08 | 979 | if (bs->read_only) |
19cb3738 | 980 | return -EACCES; |
71d0770c AL |
981 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
982 | return -EIO; | |
a55eb92c | 983 | |
c6d22830 | 984 | if (bs->dirty_bitmap) { |
7cd1e32a LS |
985 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
986 | } | |
a55eb92c | 987 | |
294cc35f KW |
988 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { |
989 | bs->wr_highest_sector = sector_num + nb_sectors - 1; | |
990 | } | |
991 | ||
42fb2807 | 992 | return drv->bdrv_write(bs, sector_num, buf, nb_sectors); |
83f64091 FB |
993 | } |
994 | ||
eda578e5 AL |
995 | int bdrv_pread(BlockDriverState *bs, int64_t offset, |
996 | void *buf, int count1) | |
83f64091 | 997 | { |
6ea44308 | 998 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
999 | int len, nb_sectors, count; |
1000 | int64_t sector_num; | |
9a8c4cce | 1001 | int ret; |
83f64091 FB |
1002 | |
1003 | count = count1; | |
1004 | /* first read to align to sector start */ | |
6ea44308 | 1005 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
1006 | if (len > count) |
1007 | len = count; | |
6ea44308 | 1008 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 1009 | if (len > 0) { |
9a8c4cce KW |
1010 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1011 | return ret; | |
6ea44308 | 1012 | memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len); |
83f64091 FB |
1013 | count -= len; |
1014 | if (count == 0) | |
1015 | return count1; | |
1016 | sector_num++; | |
1017 | buf += len; | |
1018 | } | |
1019 | ||
1020 | /* read the sectors "in place" */ | |
6ea44308 | 1021 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 1022 | if (nb_sectors > 0) { |
9a8c4cce KW |
1023 | if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0) |
1024 | return ret; | |
83f64091 | 1025 | sector_num += nb_sectors; |
6ea44308 | 1026 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
1027 | buf += len; |
1028 | count -= len; | |
1029 | } | |
1030 | ||
1031 | /* add data from the last sector */ | |
1032 | if (count > 0) { | |
9a8c4cce KW |
1033 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1034 | return ret; | |
83f64091 FB |
1035 | memcpy(buf, tmp_buf, count); |
1036 | } | |
1037 | return count1; | |
1038 | } | |
1039 | ||
eda578e5 AL |
1040 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, |
1041 | const void *buf, int count1) | |
83f64091 | 1042 | { |
6ea44308 | 1043 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
83f64091 FB |
1044 | int len, nb_sectors, count; |
1045 | int64_t sector_num; | |
9a8c4cce | 1046 | int ret; |
83f64091 FB |
1047 | |
1048 | count = count1; | |
1049 | /* first write to align to sector start */ | |
6ea44308 | 1050 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); |
83f64091 FB |
1051 | if (len > count) |
1052 | len = count; | |
6ea44308 | 1053 | sector_num = offset >> BDRV_SECTOR_BITS; |
83f64091 | 1054 | if (len > 0) { |
9a8c4cce KW |
1055 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1056 | return ret; | |
6ea44308 | 1057 | memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len); |
9a8c4cce KW |
1058 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
1059 | return ret; | |
83f64091 FB |
1060 | count -= len; |
1061 | if (count == 0) | |
1062 | return count1; | |
1063 | sector_num++; | |
1064 | buf += len; | |
1065 | } | |
1066 | ||
1067 | /* write the sectors "in place" */ | |
6ea44308 | 1068 | nb_sectors = count >> BDRV_SECTOR_BITS; |
83f64091 | 1069 | if (nb_sectors > 0) { |
9a8c4cce KW |
1070 | if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0) |
1071 | return ret; | |
83f64091 | 1072 | sector_num += nb_sectors; |
6ea44308 | 1073 | len = nb_sectors << BDRV_SECTOR_BITS; |
83f64091 FB |
1074 | buf += len; |
1075 | count -= len; | |
1076 | } | |
1077 | ||
1078 | /* add data from the last sector */ | |
1079 | if (count > 0) { | |
9a8c4cce KW |
1080 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
1081 | return ret; | |
83f64091 | 1082 | memcpy(tmp_buf, buf, count); |
9a8c4cce KW |
1083 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
1084 | return ret; | |
83f64091 FB |
1085 | } |
1086 | return count1; | |
1087 | } | |
83f64091 | 1088 | |
f08145fe KW |
1089 | /* |
1090 | * Writes to the file and ensures that no writes are reordered across this | |
1091 | * request (acts as a barrier) | |
1092 | * | |
1093 | * Returns 0 on success, -errno in error cases. | |
1094 | */ | |
1095 | int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, | |
1096 | const void *buf, int count) | |
1097 | { | |
1098 | int ret; | |
1099 | ||
1100 | ret = bdrv_pwrite(bs, offset, buf, count); | |
1101 | if (ret < 0) { | |
1102 | return ret; | |
1103 | } | |
1104 | ||
1105 | /* No flush needed for cache=writethrough, it uses O_DSYNC */ | |
1106 | if ((bs->open_flags & BDRV_O_CACHE_MASK) != 0) { | |
1107 | bdrv_flush(bs); | |
1108 | } | |
1109 | ||
1110 | return 0; | |
1111 | } | |
1112 | ||
1113 | /* | |
1114 | * Writes to the file and ensures that no writes are reordered across this | |
1115 | * request (acts as a barrier) | |
1116 | * | |
1117 | * Returns 0 on success, -errno in error cases. | |
1118 | */ | |
1119 | int bdrv_write_sync(BlockDriverState *bs, int64_t sector_num, | |
1120 | const uint8_t *buf, int nb_sectors) | |
1121 | { | |
1122 | return bdrv_pwrite_sync(bs, BDRV_SECTOR_SIZE * sector_num, | |
1123 | buf, BDRV_SECTOR_SIZE * nb_sectors); | |
1124 | } | |
1125 | ||
83f64091 FB |
1126 | /** |
1127 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
1128 | */ | |
1129 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
1130 | { | |
1131 | BlockDriver *drv = bs->drv; | |
51762288 | 1132 | int ret; |
83f64091 | 1133 | if (!drv) |
19cb3738 | 1134 | return -ENOMEDIUM; |
83f64091 FB |
1135 | if (!drv->bdrv_truncate) |
1136 | return -ENOTSUP; | |
59f2689d NS |
1137 | if (bs->read_only) |
1138 | return -EACCES; | |
8591675f MT |
1139 | if (bdrv_in_use(bs)) |
1140 | return -EBUSY; | |
51762288 SH |
1141 | ret = drv->bdrv_truncate(bs, offset); |
1142 | if (ret == 0) { | |
1143 | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); | |
db97ee6a CH |
1144 | if (bs->change_cb) { |
1145 | bs->change_cb(bs->change_opaque, CHANGE_SIZE); | |
1146 | } | |
51762288 SH |
1147 | } |
1148 | return ret; | |
83f64091 FB |
1149 | } |
1150 | ||
4a1d5e1f FZ |
1151 | /** |
1152 | * Length of a allocated file in bytes. Sparse files are counted by actual | |
1153 | * allocated space. Return < 0 if error or unknown. | |
1154 | */ | |
1155 | int64_t bdrv_get_allocated_file_size(BlockDriverState *bs) | |
1156 | { | |
1157 | BlockDriver *drv = bs->drv; | |
1158 | if (!drv) { | |
1159 | return -ENOMEDIUM; | |
1160 | } | |
1161 | if (drv->bdrv_get_allocated_file_size) { | |
1162 | return drv->bdrv_get_allocated_file_size(bs); | |
1163 | } | |
1164 | if (bs->file) { | |
1165 | return bdrv_get_allocated_file_size(bs->file); | |
1166 | } | |
1167 | return -ENOTSUP; | |
1168 | } | |
1169 | ||
83f64091 FB |
1170 | /** |
1171 | * Length of a file in bytes. Return < 0 if error or unknown. | |
1172 | */ | |
1173 | int64_t bdrv_getlength(BlockDriverState *bs) | |
1174 | { | |
1175 | BlockDriver *drv = bs->drv; | |
1176 | if (!drv) | |
19cb3738 | 1177 | return -ENOMEDIUM; |
51762288 | 1178 | |
46a4e4e6 SH |
1179 | if (bs->growable || bs->removable) { |
1180 | if (drv->bdrv_getlength) { | |
1181 | return drv->bdrv_getlength(bs); | |
1182 | } | |
83f64091 | 1183 | } |
46a4e4e6 | 1184 | return bs->total_sectors * BDRV_SECTOR_SIZE; |
fc01f7e7 FB |
1185 | } |
1186 | ||
19cb3738 | 1187 | /* return 0 as number of sectors if no device present or error */ |
96b8f136 | 1188 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) |
fc01f7e7 | 1189 | { |
19cb3738 FB |
1190 | int64_t length; |
1191 | length = bdrv_getlength(bs); | |
1192 | if (length < 0) | |
1193 | length = 0; | |
1194 | else | |
6ea44308 | 1195 | length = length >> BDRV_SECTOR_BITS; |
19cb3738 | 1196 | *nb_sectors_ptr = length; |
fc01f7e7 | 1197 | } |
cf98951b | 1198 | |
f3d54fc4 AL |
1199 | struct partition { |
1200 | uint8_t boot_ind; /* 0x80 - active */ | |
1201 | uint8_t head; /* starting head */ | |
1202 | uint8_t sector; /* starting sector */ | |
1203 | uint8_t cyl; /* starting cylinder */ | |
1204 | uint8_t sys_ind; /* What partition type */ | |
1205 | uint8_t end_head; /* end head */ | |
1206 | uint8_t end_sector; /* end sector */ | |
1207 | uint8_t end_cyl; /* end cylinder */ | |
1208 | uint32_t start_sect; /* starting sector counting from 0 */ | |
1209 | uint32_t nr_sects; /* nr of sectors in partition */ | |
1210 | } __attribute__((packed)); | |
1211 | ||
1212 | /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */ | |
1213 | static int guess_disk_lchs(BlockDriverState *bs, | |
1214 | int *pcylinders, int *pheads, int *psectors) | |
1215 | { | |
eb5a3165 | 1216 | uint8_t buf[BDRV_SECTOR_SIZE]; |
f3d54fc4 AL |
1217 | int ret, i, heads, sectors, cylinders; |
1218 | struct partition *p; | |
1219 | uint32_t nr_sects; | |
a38131b6 | 1220 | uint64_t nb_sectors; |
f3d54fc4 AL |
1221 | |
1222 | bdrv_get_geometry(bs, &nb_sectors); | |
1223 | ||
1224 | ret = bdrv_read(bs, 0, buf, 1); | |
1225 | if (ret < 0) | |
1226 | return -1; | |
1227 | /* test msdos magic */ | |
1228 | if (buf[510] != 0x55 || buf[511] != 0xaa) | |
1229 | return -1; | |
1230 | for(i = 0; i < 4; i++) { | |
1231 | p = ((struct partition *)(buf + 0x1be)) + i; | |
1232 | nr_sects = le32_to_cpu(p->nr_sects); | |
1233 | if (nr_sects && p->end_head) { | |
1234 | /* We make the assumption that the partition terminates on | |
1235 | a cylinder boundary */ | |
1236 | heads = p->end_head + 1; | |
1237 | sectors = p->end_sector & 63; | |
1238 | if (sectors == 0) | |
1239 | continue; | |
1240 | cylinders = nb_sectors / (heads * sectors); | |
1241 | if (cylinders < 1 || cylinders > 16383) | |
1242 | continue; | |
1243 | *pheads = heads; | |
1244 | *psectors = sectors; | |
1245 | *pcylinders = cylinders; | |
1246 | #if 0 | |
1247 | printf("guessed geometry: LCHS=%d %d %d\n", | |
1248 | cylinders, heads, sectors); | |
1249 | #endif | |
1250 | return 0; | |
1251 | } | |
1252 | } | |
1253 | return -1; | |
1254 | } | |
1255 | ||
1256 | void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) | |
1257 | { | |
1258 | int translation, lba_detected = 0; | |
1259 | int cylinders, heads, secs; | |
a38131b6 | 1260 | uint64_t nb_sectors; |
f3d54fc4 AL |
1261 | |
1262 | /* if a geometry hint is available, use it */ | |
1263 | bdrv_get_geometry(bs, &nb_sectors); | |
1264 | bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); | |
1265 | translation = bdrv_get_translation_hint(bs); | |
1266 | if (cylinders != 0) { | |
1267 | *pcyls = cylinders; | |
1268 | *pheads = heads; | |
1269 | *psecs = secs; | |
1270 | } else { | |
1271 | if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { | |
1272 | if (heads > 16) { | |
1273 | /* if heads > 16, it means that a BIOS LBA | |
1274 | translation was active, so the default | |
1275 | hardware geometry is OK */ | |
1276 | lba_detected = 1; | |
1277 | goto default_geometry; | |
1278 | } else { | |
1279 | *pcyls = cylinders; | |
1280 | *pheads = heads; | |
1281 | *psecs = secs; | |
1282 | /* disable any translation to be in sync with | |
1283 | the logical geometry */ | |
1284 | if (translation == BIOS_ATA_TRANSLATION_AUTO) { | |
1285 | bdrv_set_translation_hint(bs, | |
1286 | BIOS_ATA_TRANSLATION_NONE); | |
1287 | } | |
1288 | } | |
1289 | } else { | |
1290 | default_geometry: | |
1291 | /* if no geometry, use a standard physical disk geometry */ | |
1292 | cylinders = nb_sectors / (16 * 63); | |
1293 | ||
1294 | if (cylinders > 16383) | |
1295 | cylinders = 16383; | |
1296 | else if (cylinders < 2) | |
1297 | cylinders = 2; | |
1298 | *pcyls = cylinders; | |
1299 | *pheads = 16; | |
1300 | *psecs = 63; | |
1301 | if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { | |
1302 | if ((*pcyls * *pheads) <= 131072) { | |
1303 | bdrv_set_translation_hint(bs, | |
1304 | BIOS_ATA_TRANSLATION_LARGE); | |
1305 | } else { | |
1306 | bdrv_set_translation_hint(bs, | |
1307 | BIOS_ATA_TRANSLATION_LBA); | |
1308 | } | |
1309 | } | |
1310 | } | |
1311 | bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); | |
1312 | } | |
1313 | } | |
1314 | ||
5fafdf24 | 1315 | void bdrv_set_geometry_hint(BlockDriverState *bs, |
b338082b FB |
1316 | int cyls, int heads, int secs) |
1317 | { | |
1318 | bs->cyls = cyls; | |
1319 | bs->heads = heads; | |
1320 | bs->secs = secs; | |
1321 | } | |
1322 | ||
46d4767d FB |
1323 | void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
1324 | { | |
1325 | bs->translation = translation; | |
1326 | } | |
1327 | ||
5fafdf24 | 1328 | void bdrv_get_geometry_hint(BlockDriverState *bs, |
b338082b FB |
1329 | int *pcyls, int *pheads, int *psecs) |
1330 | { | |
1331 | *pcyls = bs->cyls; | |
1332 | *pheads = bs->heads; | |
1333 | *psecs = bs->secs; | |
1334 | } | |
1335 | ||
5bbdbb46 BS |
1336 | /* Recognize floppy formats */ |
1337 | typedef struct FDFormat { | |
1338 | FDriveType drive; | |
1339 | uint8_t last_sect; | |
1340 | uint8_t max_track; | |
1341 | uint8_t max_head; | |
1342 | } FDFormat; | |
1343 | ||
1344 | static const FDFormat fd_formats[] = { | |
1345 | /* First entry is default format */ | |
1346 | /* 1.44 MB 3"1/2 floppy disks */ | |
1347 | { FDRIVE_DRV_144, 18, 80, 1, }, | |
1348 | { FDRIVE_DRV_144, 20, 80, 1, }, | |
1349 | { FDRIVE_DRV_144, 21, 80, 1, }, | |
1350 | { FDRIVE_DRV_144, 21, 82, 1, }, | |
1351 | { FDRIVE_DRV_144, 21, 83, 1, }, | |
1352 | { FDRIVE_DRV_144, 22, 80, 1, }, | |
1353 | { FDRIVE_DRV_144, 23, 80, 1, }, | |
1354 | { FDRIVE_DRV_144, 24, 80, 1, }, | |
1355 | /* 2.88 MB 3"1/2 floppy disks */ | |
1356 | { FDRIVE_DRV_288, 36, 80, 1, }, | |
1357 | { FDRIVE_DRV_288, 39, 80, 1, }, | |
1358 | { FDRIVE_DRV_288, 40, 80, 1, }, | |
1359 | { FDRIVE_DRV_288, 44, 80, 1, }, | |
1360 | { FDRIVE_DRV_288, 48, 80, 1, }, | |
1361 | /* 720 kB 3"1/2 floppy disks */ | |
1362 | { FDRIVE_DRV_144, 9, 80, 1, }, | |
1363 | { FDRIVE_DRV_144, 10, 80, 1, }, | |
1364 | { FDRIVE_DRV_144, 10, 82, 1, }, | |
1365 | { FDRIVE_DRV_144, 10, 83, 1, }, | |
1366 | { FDRIVE_DRV_144, 13, 80, 1, }, | |
1367 | { FDRIVE_DRV_144, 14, 80, 1, }, | |
1368 | /* 1.2 MB 5"1/4 floppy disks */ | |
1369 | { FDRIVE_DRV_120, 15, 80, 1, }, | |
1370 | { FDRIVE_DRV_120, 18, 80, 1, }, | |
1371 | { FDRIVE_DRV_120, 18, 82, 1, }, | |
1372 | { FDRIVE_DRV_120, 18, 83, 1, }, | |
1373 | { FDRIVE_DRV_120, 20, 80, 1, }, | |
1374 | /* 720 kB 5"1/4 floppy disks */ | |
1375 | { FDRIVE_DRV_120, 9, 80, 1, }, | |
1376 | { FDRIVE_DRV_120, 11, 80, 1, }, | |
1377 | /* 360 kB 5"1/4 floppy disks */ | |
1378 | { FDRIVE_DRV_120, 9, 40, 1, }, | |
1379 | { FDRIVE_DRV_120, 9, 40, 0, }, | |
1380 | { FDRIVE_DRV_120, 10, 41, 1, }, | |
1381 | { FDRIVE_DRV_120, 10, 42, 1, }, | |
1382 | /* 320 kB 5"1/4 floppy disks */ | |
1383 | { FDRIVE_DRV_120, 8, 40, 1, }, | |
1384 | { FDRIVE_DRV_120, 8, 40, 0, }, | |
1385 | /* 360 kB must match 5"1/4 better than 3"1/2... */ | |
1386 | { FDRIVE_DRV_144, 9, 80, 0, }, | |
1387 | /* end */ | |
1388 | { FDRIVE_DRV_NONE, -1, -1, 0, }, | |
1389 | }; | |
1390 | ||
1391 | void bdrv_get_floppy_geometry_hint(BlockDriverState *bs, int *nb_heads, | |
1392 | int *max_track, int *last_sect, | |
1393 | FDriveType drive_in, FDriveType *drive) | |
1394 | { | |
1395 | const FDFormat *parse; | |
1396 | uint64_t nb_sectors, size; | |
1397 | int i, first_match, match; | |
1398 | ||
1399 | bdrv_get_geometry_hint(bs, nb_heads, max_track, last_sect); | |
1400 | if (*nb_heads != 0 && *max_track != 0 && *last_sect != 0) { | |
1401 | /* User defined disk */ | |
1402 | } else { | |
1403 | bdrv_get_geometry(bs, &nb_sectors); | |
1404 | match = -1; | |
1405 | first_match = -1; | |
1406 | for (i = 0; ; i++) { | |
1407 | parse = &fd_formats[i]; | |
1408 | if (parse->drive == FDRIVE_DRV_NONE) { | |
1409 | break; | |
1410 | } | |
1411 | if (drive_in == parse->drive || | |
1412 | drive_in == FDRIVE_DRV_NONE) { | |
1413 | size = (parse->max_head + 1) * parse->max_track * | |
1414 | parse->last_sect; | |
1415 | if (nb_sectors == size) { | |
1416 | match = i; | |
1417 | break; | |
1418 | } | |
1419 | if (first_match == -1) { | |
1420 | first_match = i; | |
1421 | } | |
1422 | } | |
1423 | } | |
1424 | if (match == -1) { | |
1425 | if (first_match == -1) { | |
1426 | match = 1; | |
1427 | } else { | |
1428 | match = first_match; | |
1429 | } | |
1430 | parse = &fd_formats[match]; | |
1431 | } | |
1432 | *nb_heads = parse->max_head + 1; | |
1433 | *max_track = parse->max_track; | |
1434 | *last_sect = parse->last_sect; | |
1435 | *drive = parse->drive; | |
1436 | } | |
1437 | } | |
1438 | ||
46d4767d FB |
1439 | int bdrv_get_translation_hint(BlockDriverState *bs) |
1440 | { | |
1441 | return bs->translation; | |
1442 | } | |
1443 | ||
abd7f68d MA |
1444 | void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error, |
1445 | BlockErrorAction on_write_error) | |
1446 | { | |
1447 | bs->on_read_error = on_read_error; | |
1448 | bs->on_write_error = on_write_error; | |
1449 | } | |
1450 | ||
1451 | BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read) | |
1452 | { | |
1453 | return is_read ? bs->on_read_error : bs->on_write_error; | |
1454 | } | |
1455 | ||
7d0d6950 MA |
1456 | void bdrv_set_removable(BlockDriverState *bs, int removable) |
1457 | { | |
1458 | bs->removable = removable; | |
1459 | if (removable && bs == bs_snapshots) { | |
1460 | bs_snapshots = NULL; | |
1461 | } | |
1462 | } | |
1463 | ||
b338082b FB |
1464 | int bdrv_is_removable(BlockDriverState *bs) |
1465 | { | |
1466 | return bs->removable; | |
1467 | } | |
1468 | ||
1469 | int bdrv_is_read_only(BlockDriverState *bs) | |
1470 | { | |
1471 | return bs->read_only; | |
1472 | } | |
1473 | ||
985a03b0 TS |
1474 | int bdrv_is_sg(BlockDriverState *bs) |
1475 | { | |
1476 | return bs->sg; | |
1477 | } | |
1478 | ||
e900a7b7 CH |
1479 | int bdrv_enable_write_cache(BlockDriverState *bs) |
1480 | { | |
1481 | return bs->enable_write_cache; | |
1482 | } | |
1483 | ||
19cb3738 | 1484 | /* XXX: no longer used */ |
5fafdf24 | 1485 | void bdrv_set_change_cb(BlockDriverState *bs, |
db97ee6a CH |
1486 | void (*change_cb)(void *opaque, int reason), |
1487 | void *opaque) | |
b338082b FB |
1488 | { |
1489 | bs->change_cb = change_cb; | |
1490 | bs->change_opaque = opaque; | |
1491 | } | |
1492 | ||
ea2384d3 FB |
1493 | int bdrv_is_encrypted(BlockDriverState *bs) |
1494 | { | |
1495 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
1496 | return 1; | |
1497 | return bs->encrypted; | |
1498 | } | |
1499 | ||
c0f4ce77 AL |
1500 | int bdrv_key_required(BlockDriverState *bs) |
1501 | { | |
1502 | BlockDriverState *backing_hd = bs->backing_hd; | |
1503 | ||
1504 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) | |
1505 | return 1; | |
1506 | return (bs->encrypted && !bs->valid_key); | |
1507 | } | |
1508 | ||
ea2384d3 FB |
1509 | int bdrv_set_key(BlockDriverState *bs, const char *key) |
1510 | { | |
1511 | int ret; | |
1512 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
1513 | ret = bdrv_set_key(bs->backing_hd, key); | |
1514 | if (ret < 0) | |
1515 | return ret; | |
1516 | if (!bs->encrypted) | |
1517 | return 0; | |
1518 | } | |
fd04a2ae SH |
1519 | if (!bs->encrypted) { |
1520 | return -EINVAL; | |
1521 | } else if (!bs->drv || !bs->drv->bdrv_set_key) { | |
1522 | return -ENOMEDIUM; | |
1523 | } | |
c0f4ce77 | 1524 | ret = bs->drv->bdrv_set_key(bs, key); |
bb5fc20f AL |
1525 | if (ret < 0) { |
1526 | bs->valid_key = 0; | |
1527 | } else if (!bs->valid_key) { | |
1528 | bs->valid_key = 1; | |
1529 | /* call the change callback now, we skipped it on open */ | |
1530 | bs->media_changed = 1; | |
1531 | if (bs->change_cb) | |
db97ee6a | 1532 | bs->change_cb(bs->change_opaque, CHANGE_MEDIA); |
bb5fc20f | 1533 | } |
c0f4ce77 | 1534 | return ret; |
ea2384d3 FB |
1535 | } |
1536 | ||
1537 | void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) | |
1538 | { | |
19cb3738 | 1539 | if (!bs->drv) { |
ea2384d3 FB |
1540 | buf[0] = '\0'; |
1541 | } else { | |
1542 | pstrcpy(buf, buf_size, bs->drv->format_name); | |
1543 | } | |
1544 | } | |
1545 | ||
5fafdf24 | 1546 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
ea2384d3 FB |
1547 | void *opaque) |
1548 | { | |
1549 | BlockDriver *drv; | |
1550 | ||
8a22f02a | 1551 | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
ea2384d3 FB |
1552 | it(opaque, drv->format_name); |
1553 | } | |
1554 | } | |
1555 | ||
b338082b FB |
1556 | BlockDriverState *bdrv_find(const char *name) |
1557 | { | |
1558 | BlockDriverState *bs; | |
1559 | ||
1b7bdbc1 SH |
1560 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
1561 | if (!strcmp(name, bs->device_name)) { | |
b338082b | 1562 | return bs; |
1b7bdbc1 | 1563 | } |
b338082b FB |
1564 | } |
1565 | return NULL; | |
1566 | } | |
1567 | ||
2f399b0a MA |
1568 | BlockDriverState *bdrv_next(BlockDriverState *bs) |
1569 | { | |
1570 | if (!bs) { | |
1571 | return QTAILQ_FIRST(&bdrv_states); | |
1572 | } | |
1573 | return QTAILQ_NEXT(bs, list); | |
1574 | } | |
1575 | ||
51de9760 | 1576 | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
81d0912d FB |
1577 | { |
1578 | BlockDriverState *bs; | |
1579 | ||
1b7bdbc1 | 1580 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
51de9760 | 1581 | it(opaque, bs); |
81d0912d FB |
1582 | } |
1583 | } | |
1584 | ||
ea2384d3 FB |
1585 | const char *bdrv_get_device_name(BlockDriverState *bs) |
1586 | { | |
1587 | return bs->device_name; | |
1588 | } | |
1589 | ||
205ef796 | 1590 | int bdrv_flush(BlockDriverState *bs) |
7a6cba61 | 1591 | { |
016f5cf6 | 1592 | if (bs->open_flags & BDRV_O_NO_FLUSH) { |
205ef796 KW |
1593 | return 0; |
1594 | } | |
1595 | ||
1596 | if (bs->drv && bs->drv->bdrv_flush) { | |
1597 | return bs->drv->bdrv_flush(bs); | |
016f5cf6 AG |
1598 | } |
1599 | ||
205ef796 KW |
1600 | /* |
1601 | * Some block drivers always operate in either writethrough or unsafe mode | |
1602 | * and don't support bdrv_flush therefore. Usually qemu doesn't know how | |
1603 | * the server works (because the behaviour is hardcoded or depends on | |
1604 | * server-side configuration), so we can't ensure that everything is safe | |
1605 | * on disk. Returning an error doesn't work because that would break guests | |
1606 | * even if the server operates in writethrough mode. | |
1607 | * | |
1608 | * Let's hope the user knows what he's doing. | |
1609 | */ | |
1610 | return 0; | |
7a6cba61 PB |
1611 | } |
1612 | ||
c6ca28d6 AL |
1613 | void bdrv_flush_all(void) |
1614 | { | |
1615 | BlockDriverState *bs; | |
1616 | ||
1b7bdbc1 SH |
1617 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
1618 | if (bs->drv && !bdrv_is_read_only(bs) && | |
1619 | (!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) { | |
c6ca28d6 | 1620 | bdrv_flush(bs); |
1b7bdbc1 SH |
1621 | } |
1622 | } | |
c6ca28d6 AL |
1623 | } |
1624 | ||
f2feebbd KW |
1625 | int bdrv_has_zero_init(BlockDriverState *bs) |
1626 | { | |
1627 | assert(bs->drv); | |
1628 | ||
336c1c12 KW |
1629 | if (bs->drv->bdrv_has_zero_init) { |
1630 | return bs->drv->bdrv_has_zero_init(bs); | |
f2feebbd KW |
1631 | } |
1632 | ||
1633 | return 1; | |
1634 | } | |
1635 | ||
bb8bf76f CH |
1636 | int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors) |
1637 | { | |
1638 | if (!bs->drv) { | |
1639 | return -ENOMEDIUM; | |
1640 | } | |
1641 | if (!bs->drv->bdrv_discard) { | |
1642 | return 0; | |
1643 | } | |
1644 | return bs->drv->bdrv_discard(bs, sector_num, nb_sectors); | |
1645 | } | |
1646 | ||
f58c7b35 TS |
1647 | /* |
1648 | * Returns true iff the specified sector is present in the disk image. Drivers | |
1649 | * not implementing the functionality are assumed to not support backing files, | |
1650 | * hence all their sectors are reported as allocated. | |
1651 | * | |
1652 | * 'pnum' is set to the number of sectors (including and immediately following | |
1653 | * the specified sector) that are known to be in the same | |
1654 | * allocated/unallocated state. | |
1655 | * | |
1656 | * 'nb_sectors' is the max value 'pnum' should be set to. | |
1657 | */ | |
1658 | int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, | |
1659 | int *pnum) | |
1660 | { | |
1661 | int64_t n; | |
1662 | if (!bs->drv->bdrv_is_allocated) { | |
1663 | if (sector_num >= bs->total_sectors) { | |
1664 | *pnum = 0; | |
1665 | return 0; | |
1666 | } | |
1667 | n = bs->total_sectors - sector_num; | |
1668 | *pnum = (n < nb_sectors) ? (n) : (nb_sectors); | |
1669 | return 1; | |
1670 | } | |
1671 | return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum); | |
1672 | } | |
1673 | ||
2582bfed LC |
1674 | void bdrv_mon_event(const BlockDriverState *bdrv, |
1675 | BlockMonEventAction action, int is_read) | |
1676 | { | |
1677 | QObject *data; | |
1678 | const char *action_str; | |
1679 | ||
1680 | switch (action) { | |
1681 | case BDRV_ACTION_REPORT: | |
1682 | action_str = "report"; | |
1683 | break; | |
1684 | case BDRV_ACTION_IGNORE: | |
1685 | action_str = "ignore"; | |
1686 | break; | |
1687 | case BDRV_ACTION_STOP: | |
1688 | action_str = "stop"; | |
1689 | break; | |
1690 | default: | |
1691 | abort(); | |
1692 | } | |
1693 | ||
1694 | data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }", | |
1695 | bdrv->device_name, | |
1696 | action_str, | |
1697 | is_read ? "read" : "write"); | |
1698 | monitor_protocol_event(QEVENT_BLOCK_IO_ERROR, data); | |
1699 | ||
1700 | qobject_decref(data); | |
1701 | } | |
1702 | ||
d15e5465 | 1703 | static void bdrv_print_dict(QObject *obj, void *opaque) |
b338082b | 1704 | { |
d15e5465 LC |
1705 | QDict *bs_dict; |
1706 | Monitor *mon = opaque; | |
1707 | ||
1708 | bs_dict = qobject_to_qdict(obj); | |
1709 | ||
d8aeeb31 | 1710 | monitor_printf(mon, "%s: removable=%d", |
d15e5465 | 1711 | qdict_get_str(bs_dict, "device"), |
d15e5465 LC |
1712 | qdict_get_bool(bs_dict, "removable")); |
1713 | ||
1714 | if (qdict_get_bool(bs_dict, "removable")) { | |
1715 | monitor_printf(mon, " locked=%d", qdict_get_bool(bs_dict, "locked")); | |
1716 | } | |
1717 | ||
1718 | if (qdict_haskey(bs_dict, "inserted")) { | |
1719 | QDict *qdict = qobject_to_qdict(qdict_get(bs_dict, "inserted")); | |
1720 | ||
1721 | monitor_printf(mon, " file="); | |
1722 | monitor_print_filename(mon, qdict_get_str(qdict, "file")); | |
1723 | if (qdict_haskey(qdict, "backing_file")) { | |
1724 | monitor_printf(mon, " backing_file="); | |
1725 | monitor_print_filename(mon, qdict_get_str(qdict, "backing_file")); | |
1726 | } | |
1727 | monitor_printf(mon, " ro=%d drv=%s encrypted=%d", | |
1728 | qdict_get_bool(qdict, "ro"), | |
1729 | qdict_get_str(qdict, "drv"), | |
1730 | qdict_get_bool(qdict, "encrypted")); | |
1731 | } else { | |
1732 | monitor_printf(mon, " [not inserted]"); | |
1733 | } | |
1734 | ||
1735 | monitor_printf(mon, "\n"); | |
1736 | } | |
1737 | ||
1738 | void bdrv_info_print(Monitor *mon, const QObject *data) | |
1739 | { | |
1740 | qlist_iter(qobject_to_qlist(data), bdrv_print_dict, mon); | |
1741 | } | |
1742 | ||
d15e5465 LC |
1743 | void bdrv_info(Monitor *mon, QObject **ret_data) |
1744 | { | |
1745 | QList *bs_list; | |
b338082b FB |
1746 | BlockDriverState *bs; |
1747 | ||
d15e5465 LC |
1748 | bs_list = qlist_new(); |
1749 | ||
1b7bdbc1 | 1750 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
d15e5465 | 1751 | QObject *bs_obj; |
d15e5465 | 1752 | |
d8aeeb31 | 1753 | bs_obj = qobject_from_jsonf("{ 'device': %s, 'type': 'unknown', " |
d15e5465 | 1754 | "'removable': %i, 'locked': %i }", |
d8aeeb31 | 1755 | bs->device_name, bs->removable, |
d15e5465 | 1756 | bs->locked); |
d15e5465 | 1757 | |
19cb3738 | 1758 | if (bs->drv) { |
d15e5465 LC |
1759 | QObject *obj; |
1760 | QDict *bs_dict = qobject_to_qdict(bs_obj); | |
1761 | ||
1762 | obj = qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, " | |
1763 | "'encrypted': %i }", | |
1764 | bs->filename, bs->read_only, | |
1765 | bs->drv->format_name, | |
1766 | bdrv_is_encrypted(bs)); | |
fef30743 | 1767 | if (bs->backing_file[0] != '\0') { |
d15e5465 LC |
1768 | QDict *qdict = qobject_to_qdict(obj); |
1769 | qdict_put(qdict, "backing_file", | |
1770 | qstring_from_str(bs->backing_file)); | |
376253ec | 1771 | } |
d15e5465 LC |
1772 | |
1773 | qdict_put_obj(bs_dict, "inserted", obj); | |
b338082b | 1774 | } |
d15e5465 | 1775 | qlist_append_obj(bs_list, bs_obj); |
b338082b | 1776 | } |
d15e5465 LC |
1777 | |
1778 | *ret_data = QOBJECT(bs_list); | |
b338082b | 1779 | } |
a36e69dd | 1780 | |
218a536a | 1781 | static void bdrv_stats_iter(QObject *data, void *opaque) |
a36e69dd | 1782 | { |
218a536a LC |
1783 | QDict *qdict; |
1784 | Monitor *mon = opaque; | |
1785 | ||
1786 | qdict = qobject_to_qdict(data); | |
1787 | monitor_printf(mon, "%s:", qdict_get_str(qdict, "device")); | |
1788 | ||
1789 | qdict = qobject_to_qdict(qdict_get(qdict, "stats")); | |
1790 | monitor_printf(mon, " rd_bytes=%" PRId64 | |
1791 | " wr_bytes=%" PRId64 | |
1792 | " rd_operations=%" PRId64 | |
1793 | " wr_operations=%" PRId64 | |
1794 | "\n", | |
1795 | qdict_get_int(qdict, "rd_bytes"), | |
1796 | qdict_get_int(qdict, "wr_bytes"), | |
1797 | qdict_get_int(qdict, "rd_operations"), | |
1798 | qdict_get_int(qdict, "wr_operations")); | |
1799 | } | |
1800 | ||
1801 | void bdrv_stats_print(Monitor *mon, const QObject *data) | |
1802 | { | |
1803 | qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon); | |
1804 | } | |
1805 | ||
294cc35f KW |
1806 | static QObject* bdrv_info_stats_bs(BlockDriverState *bs) |
1807 | { | |
1808 | QObject *res; | |
1809 | QDict *dict; | |
1810 | ||
1811 | res = qobject_from_jsonf("{ 'stats': {" | |
1812 | "'rd_bytes': %" PRId64 "," | |
1813 | "'wr_bytes': %" PRId64 "," | |
1814 | "'rd_operations': %" PRId64 "," | |
1815 | "'wr_operations': %" PRId64 "," | |
1816 | "'wr_highest_offset': %" PRId64 | |
1817 | "} }", | |
1818 | bs->rd_bytes, bs->wr_bytes, | |
1819 | bs->rd_ops, bs->wr_ops, | |
5ffbbc67 BS |
1820 | bs->wr_highest_sector * |
1821 | (uint64_t)BDRV_SECTOR_SIZE); | |
294cc35f KW |
1822 | dict = qobject_to_qdict(res); |
1823 | ||
1824 | if (*bs->device_name) { | |
1825 | qdict_put(dict, "device", qstring_from_str(bs->device_name)); | |
1826 | } | |
1827 | ||
1828 | if (bs->file) { | |
1829 | QObject *parent = bdrv_info_stats_bs(bs->file); | |
1830 | qdict_put_obj(dict, "parent", parent); | |
1831 | } | |
1832 | ||
1833 | return res; | |
1834 | } | |
1835 | ||
218a536a LC |
1836 | void bdrv_info_stats(Monitor *mon, QObject **ret_data) |
1837 | { | |
1838 | QObject *obj; | |
1839 | QList *devices; | |
a36e69dd TS |
1840 | BlockDriverState *bs; |
1841 | ||
218a536a LC |
1842 | devices = qlist_new(); |
1843 | ||
1b7bdbc1 | 1844 | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
294cc35f | 1845 | obj = bdrv_info_stats_bs(bs); |
218a536a | 1846 | qlist_append_obj(devices, obj); |
a36e69dd | 1847 | } |
218a536a LC |
1848 | |
1849 | *ret_data = QOBJECT(devices); | |
a36e69dd | 1850 | } |
ea2384d3 | 1851 | |
045df330 AL |
1852 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
1853 | { | |
1854 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
1855 | return bs->backing_file; | |
1856 | else if (bs->encrypted) | |
1857 | return bs->filename; | |
1858 | else | |
1859 | return NULL; | |
1860 | } | |
1861 | ||
5fafdf24 | 1862 | void bdrv_get_backing_filename(BlockDriverState *bs, |
83f64091 FB |
1863 | char *filename, int filename_size) |
1864 | { | |
b783e409 | 1865 | if (!bs->backing_file) { |
83f64091 FB |
1866 | pstrcpy(filename, filename_size, ""); |
1867 | } else { | |
1868 | pstrcpy(filename, filename_size, bs->backing_file); | |
1869 | } | |
1870 | } | |
1871 | ||
5fafdf24 | 1872 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, |
faea38e7 FB |
1873 | const uint8_t *buf, int nb_sectors) |
1874 | { | |
1875 | BlockDriver *drv = bs->drv; | |
1876 | if (!drv) | |
19cb3738 | 1877 | return -ENOMEDIUM; |
faea38e7 FB |
1878 | if (!drv->bdrv_write_compressed) |
1879 | return -ENOTSUP; | |
fbb7b4e0 KW |
1880 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
1881 | return -EIO; | |
a55eb92c | 1882 | |
c6d22830 | 1883 | if (bs->dirty_bitmap) { |
7cd1e32a LS |
1884 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); |
1885 | } | |
a55eb92c | 1886 | |
faea38e7 FB |
1887 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); |
1888 | } | |
3b46e624 | 1889 | |
faea38e7 FB |
1890 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
1891 | { | |
1892 | BlockDriver *drv = bs->drv; | |
1893 | if (!drv) | |
19cb3738 | 1894 | return -ENOMEDIUM; |
faea38e7 FB |
1895 | if (!drv->bdrv_get_info) |
1896 | return -ENOTSUP; | |
1897 | memset(bdi, 0, sizeof(*bdi)); | |
1898 | return drv->bdrv_get_info(bs, bdi); | |
1899 | } | |
1900 | ||
45566e9c CH |
1901 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
1902 | int64_t pos, int size) | |
178e08a5 AL |
1903 | { |
1904 | BlockDriver *drv = bs->drv; | |
1905 | if (!drv) | |
1906 | return -ENOMEDIUM; | |
7cdb1f6d MK |
1907 | if (drv->bdrv_save_vmstate) |
1908 | return drv->bdrv_save_vmstate(bs, buf, pos, size); | |
1909 | if (bs->file) | |
1910 | return bdrv_save_vmstate(bs->file, buf, pos, size); | |
1911 | return -ENOTSUP; | |
178e08a5 AL |
1912 | } |
1913 | ||
45566e9c CH |
1914 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
1915 | int64_t pos, int size) | |
178e08a5 AL |
1916 | { |
1917 | BlockDriver *drv = bs->drv; | |
1918 | if (!drv) | |
1919 | return -ENOMEDIUM; | |
7cdb1f6d MK |
1920 | if (drv->bdrv_load_vmstate) |
1921 | return drv->bdrv_load_vmstate(bs, buf, pos, size); | |
1922 | if (bs->file) | |
1923 | return bdrv_load_vmstate(bs->file, buf, pos, size); | |
1924 | return -ENOTSUP; | |
178e08a5 AL |
1925 | } |
1926 | ||
8b9b0cc2 KW |
1927 | void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event) |
1928 | { | |
1929 | BlockDriver *drv = bs->drv; | |
1930 | ||
1931 | if (!drv || !drv->bdrv_debug_event) { | |
1932 | return; | |
1933 | } | |
1934 | ||
1935 | return drv->bdrv_debug_event(bs, event); | |
1936 | ||
1937 | } | |
1938 | ||
faea38e7 FB |
1939 | /**************************************************************/ |
1940 | /* handling of snapshots */ | |
1941 | ||
feeee5ac MDCF |
1942 | int bdrv_can_snapshot(BlockDriverState *bs) |
1943 | { | |
1944 | BlockDriver *drv = bs->drv; | |
1945 | if (!drv || bdrv_is_removable(bs) || bdrv_is_read_only(bs)) { | |
1946 | return 0; | |
1947 | } | |
1948 | ||
1949 | if (!drv->bdrv_snapshot_create) { | |
1950 | if (bs->file != NULL) { | |
1951 | return bdrv_can_snapshot(bs->file); | |
1952 | } | |
1953 | return 0; | |
1954 | } | |
1955 | ||
1956 | return 1; | |
1957 | } | |
1958 | ||
199630b6 BS |
1959 | int bdrv_is_snapshot(BlockDriverState *bs) |
1960 | { | |
1961 | return !!(bs->open_flags & BDRV_O_SNAPSHOT); | |
1962 | } | |
1963 | ||
f9092b10 MA |
1964 | BlockDriverState *bdrv_snapshots(void) |
1965 | { | |
1966 | BlockDriverState *bs; | |
1967 | ||
3ac906f7 | 1968 | if (bs_snapshots) { |
f9092b10 | 1969 | return bs_snapshots; |
3ac906f7 | 1970 | } |
f9092b10 MA |
1971 | |
1972 | bs = NULL; | |
1973 | while ((bs = bdrv_next(bs))) { | |
1974 | if (bdrv_can_snapshot(bs)) { | |
3ac906f7 MA |
1975 | bs_snapshots = bs; |
1976 | return bs; | |
f9092b10 MA |
1977 | } |
1978 | } | |
1979 | return NULL; | |
f9092b10 MA |
1980 | } |
1981 | ||
5fafdf24 | 1982 | int bdrv_snapshot_create(BlockDriverState *bs, |
faea38e7 FB |
1983 | QEMUSnapshotInfo *sn_info) |
1984 | { | |
1985 | BlockDriver *drv = bs->drv; | |
1986 | if (!drv) | |
19cb3738 | 1987 | return -ENOMEDIUM; |
7cdb1f6d MK |
1988 | if (drv->bdrv_snapshot_create) |
1989 | return drv->bdrv_snapshot_create(bs, sn_info); | |
1990 | if (bs->file) | |
1991 | return bdrv_snapshot_create(bs->file, sn_info); | |
1992 | return -ENOTSUP; | |
faea38e7 FB |
1993 | } |
1994 | ||
5fafdf24 | 1995 | int bdrv_snapshot_goto(BlockDriverState *bs, |
faea38e7 FB |
1996 | const char *snapshot_id) |
1997 | { | |
1998 | BlockDriver *drv = bs->drv; | |
7cdb1f6d MK |
1999 | int ret, open_ret; |
2000 | ||
faea38e7 | 2001 | if (!drv) |
19cb3738 | 2002 | return -ENOMEDIUM; |
7cdb1f6d MK |
2003 | if (drv->bdrv_snapshot_goto) |
2004 | return drv->bdrv_snapshot_goto(bs, snapshot_id); | |
2005 | ||
2006 | if (bs->file) { | |
2007 | drv->bdrv_close(bs); | |
2008 | ret = bdrv_snapshot_goto(bs->file, snapshot_id); | |
2009 | open_ret = drv->bdrv_open(bs, bs->open_flags); | |
2010 | if (open_ret < 0) { | |
2011 | bdrv_delete(bs->file); | |
2012 | bs->drv = NULL; | |
2013 | return open_ret; | |
2014 | } | |
2015 | return ret; | |
2016 | } | |
2017 | ||
2018 | return -ENOTSUP; | |
faea38e7 FB |
2019 | } |
2020 | ||
2021 | int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) | |
2022 | { | |
2023 | BlockDriver *drv = bs->drv; | |
2024 | if (!drv) | |
19cb3738 | 2025 | return -ENOMEDIUM; |
7cdb1f6d MK |
2026 | if (drv->bdrv_snapshot_delete) |
2027 | return drv->bdrv_snapshot_delete(bs, snapshot_id); | |
2028 | if (bs->file) | |
2029 | return bdrv_snapshot_delete(bs->file, snapshot_id); | |
2030 | return -ENOTSUP; | |
faea38e7 FB |
2031 | } |
2032 | ||
5fafdf24 | 2033 | int bdrv_snapshot_list(BlockDriverState *bs, |
faea38e7 FB |
2034 | QEMUSnapshotInfo **psn_info) |
2035 | { | |
2036 | BlockDriver *drv = bs->drv; | |
2037 | if (!drv) | |
19cb3738 | 2038 | return -ENOMEDIUM; |
7cdb1f6d MK |
2039 | if (drv->bdrv_snapshot_list) |
2040 | return drv->bdrv_snapshot_list(bs, psn_info); | |
2041 | if (bs->file) | |
2042 | return bdrv_snapshot_list(bs->file, psn_info); | |
2043 | return -ENOTSUP; | |
faea38e7 FB |
2044 | } |
2045 | ||
51ef6727 | 2046 | int bdrv_snapshot_load_tmp(BlockDriverState *bs, |
2047 | const char *snapshot_name) | |
2048 | { | |
2049 | BlockDriver *drv = bs->drv; | |
2050 | if (!drv) { | |
2051 | return -ENOMEDIUM; | |
2052 | } | |
2053 | if (!bs->read_only) { | |
2054 | return -EINVAL; | |
2055 | } | |
2056 | if (drv->bdrv_snapshot_load_tmp) { | |
2057 | return drv->bdrv_snapshot_load_tmp(bs, snapshot_name); | |
2058 | } | |
2059 | return -ENOTSUP; | |
2060 | } | |
2061 | ||
faea38e7 FB |
2062 | #define NB_SUFFIXES 4 |
2063 | ||
2064 | char *get_human_readable_size(char *buf, int buf_size, int64_t size) | |
2065 | { | |
2066 | static const char suffixes[NB_SUFFIXES] = "KMGT"; | |
2067 | int64_t base; | |
2068 | int i; | |
2069 | ||
2070 | if (size <= 999) { | |
2071 | snprintf(buf, buf_size, "%" PRId64, size); | |
2072 | } else { | |
2073 | base = 1024; | |
2074 | for(i = 0; i < NB_SUFFIXES; i++) { | |
2075 | if (size < (10 * base)) { | |
5fafdf24 | 2076 | snprintf(buf, buf_size, "%0.1f%c", |
faea38e7 FB |
2077 | (double)size / base, |
2078 | suffixes[i]); | |
2079 | break; | |
2080 | } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { | |
5fafdf24 | 2081 | snprintf(buf, buf_size, "%" PRId64 "%c", |
faea38e7 FB |
2082 | ((size + (base >> 1)) / base), |
2083 | suffixes[i]); | |
2084 | break; | |
2085 | } | |
2086 | base = base * 1024; | |
2087 | } | |
2088 | } | |
2089 | return buf; | |
2090 | } | |
2091 | ||
2092 | char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) | |
2093 | { | |
2094 | char buf1[128], date_buf[128], clock_buf[128]; | |
3b9f94e1 FB |
2095 | #ifdef _WIN32 |
2096 | struct tm *ptm; | |
2097 | #else | |
faea38e7 | 2098 | struct tm tm; |
3b9f94e1 | 2099 | #endif |
faea38e7 FB |
2100 | time_t ti; |
2101 | int64_t secs; | |
2102 | ||
2103 | if (!sn) { | |
5fafdf24 TS |
2104 | snprintf(buf, buf_size, |
2105 | "%-10s%-20s%7s%20s%15s", | |
faea38e7 FB |
2106 | "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
2107 | } else { | |
2108 | ti = sn->date_sec; | |
3b9f94e1 FB |
2109 | #ifdef _WIN32 |
2110 | ptm = localtime(&ti); | |
2111 | strftime(date_buf, sizeof(date_buf), | |
2112 | "%Y-%m-%d %H:%M:%S", ptm); | |
2113 | #else | |
faea38e7 FB |
2114 | localtime_r(&ti, &tm); |
2115 | strftime(date_buf, sizeof(date_buf), | |
2116 | "%Y-%m-%d %H:%M:%S", &tm); | |
3b9f94e1 | 2117 | #endif |
faea38e7 FB |
2118 | secs = sn->vm_clock_nsec / 1000000000; |
2119 | snprintf(clock_buf, sizeof(clock_buf), | |
2120 | "%02d:%02d:%02d.%03d", | |
2121 | (int)(secs / 3600), | |
2122 | (int)((secs / 60) % 60), | |
5fafdf24 | 2123 | (int)(secs % 60), |
faea38e7 FB |
2124 | (int)((sn->vm_clock_nsec / 1000000) % 1000)); |
2125 | snprintf(buf, buf_size, | |
5fafdf24 | 2126 | "%-10s%-20s%7s%20s%15s", |
faea38e7 FB |
2127 | sn->id_str, sn->name, |
2128 | get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), | |
2129 | date_buf, | |
2130 | clock_buf); | |
2131 | } | |
2132 | return buf; | |
2133 | } | |
2134 | ||
83f64091 | 2135 | |
ea2384d3 | 2136 | /**************************************************************/ |
83f64091 | 2137 | /* async I/Os */ |
ea2384d3 | 2138 | |
3b69e4b9 | 2139 | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
f141eafe | 2140 | QEMUIOVector *qiov, int nb_sectors, |
3b69e4b9 | 2141 | BlockDriverCompletionFunc *cb, void *opaque) |
83f64091 FB |
2142 | { |
2143 | BlockDriver *drv = bs->drv; | |
a36e69dd | 2144 | BlockDriverAIOCB *ret; |
83f64091 | 2145 | |
bbf0a440 SH |
2146 | trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque); |
2147 | ||
19cb3738 | 2148 | if (!drv) |
ce1a14dc | 2149 | return NULL; |
71d0770c AL |
2150 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
2151 | return NULL; | |
3b46e624 | 2152 | |
f141eafe AL |
2153 | ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors, |
2154 | cb, opaque); | |
a36e69dd TS |
2155 | |
2156 | if (ret) { | |
2157 | /* Update stats even though technically transfer has not happened. */ | |
6ea44308 | 2158 | bs->rd_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE; |
a36e69dd TS |
2159 | bs->rd_ops ++; |
2160 | } | |
2161 | ||
2162 | return ret; | |
ea2384d3 FB |
2163 | } |
2164 | ||
4dcafbb1 MT |
2165 | typedef struct BlockCompleteData { |
2166 | BlockDriverCompletionFunc *cb; | |
2167 | void *opaque; | |
2168 | BlockDriverState *bs; | |
2169 | int64_t sector_num; | |
2170 | int nb_sectors; | |
2171 | } BlockCompleteData; | |
2172 | ||
2173 | static void block_complete_cb(void *opaque, int ret) | |
2174 | { | |
2175 | BlockCompleteData *b = opaque; | |
2176 | ||
2177 | if (b->bs->dirty_bitmap) { | |
2178 | set_dirty_bitmap(b->bs, b->sector_num, b->nb_sectors, 1); | |
2179 | } | |
2180 | b->cb(b->opaque, ret); | |
2181 | qemu_free(b); | |
2182 | } | |
2183 | ||
2184 | static BlockCompleteData *blk_dirty_cb_alloc(BlockDriverState *bs, | |
2185 | int64_t sector_num, | |
2186 | int nb_sectors, | |
2187 | BlockDriverCompletionFunc *cb, | |
2188 | void *opaque) | |
2189 | { | |
2190 | BlockCompleteData *blkdata = qemu_mallocz(sizeof(BlockCompleteData)); | |
2191 | ||
2192 | blkdata->bs = bs; | |
2193 | blkdata->cb = cb; | |
2194 | blkdata->opaque = opaque; | |
2195 | blkdata->sector_num = sector_num; | |
2196 | blkdata->nb_sectors = nb_sectors; | |
2197 | ||
2198 | return blkdata; | |
2199 | } | |
2200 | ||
f141eafe AL |
2201 | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
2202 | QEMUIOVector *qiov, int nb_sectors, | |
2203 | BlockDriverCompletionFunc *cb, void *opaque) | |
ea2384d3 | 2204 | { |
83f64091 | 2205 | BlockDriver *drv = bs->drv; |
a36e69dd | 2206 | BlockDriverAIOCB *ret; |
4dcafbb1 | 2207 | BlockCompleteData *blk_cb_data; |
ea2384d3 | 2208 | |
bbf0a440 SH |
2209 | trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque); |
2210 | ||
19cb3738 | 2211 | if (!drv) |
ce1a14dc | 2212 | return NULL; |
83f64091 | 2213 | if (bs->read_only) |
ce1a14dc | 2214 | return NULL; |
71d0770c AL |
2215 | if (bdrv_check_request(bs, sector_num, nb_sectors)) |
2216 | return NULL; | |
83f64091 | 2217 | |
c6d22830 | 2218 | if (bs->dirty_bitmap) { |
4dcafbb1 MT |
2219 | blk_cb_data = blk_dirty_cb_alloc(bs, sector_num, nb_sectors, cb, |
2220 | opaque); | |
2221 | cb = &block_complete_cb; | |
2222 | opaque = blk_cb_data; | |
7cd1e32a | 2223 | } |
a55eb92c | 2224 | |
f141eafe AL |
2225 | ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors, |
2226 | cb, opaque); | |
a36e69dd TS |
2227 | |
2228 | if (ret) { | |
294cc35f KW |
2229 | /* Update stats even though technically transfer has not happened. */ |
2230 | bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE; | |
2231 | bs->wr_ops ++; | |
2232 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { | |
2233 | bs->wr_highest_sector = sector_num + nb_sectors - 1; | |
2234 | } | |
a36e69dd TS |
2235 | } |
2236 | ||
2237 | return ret; | |
83f64091 FB |
2238 | } |
2239 | ||
40b4f539 KW |
2240 | |
2241 | typedef struct MultiwriteCB { | |
2242 | int error; | |
2243 | int num_requests; | |
2244 | int num_callbacks; | |
2245 | struct { | |
2246 | BlockDriverCompletionFunc *cb; | |
2247 | void *opaque; | |
2248 | QEMUIOVector *free_qiov; | |
2249 | void *free_buf; | |
2250 | } callbacks[]; | |
2251 | } MultiwriteCB; | |
2252 | ||
2253 | static void multiwrite_user_cb(MultiwriteCB *mcb) | |
2254 | { | |
2255 | int i; | |
2256 | ||
2257 | for (i = 0; i < mcb->num_callbacks; i++) { | |
2258 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); | |
1e1ea48d SH |
2259 | if (mcb->callbacks[i].free_qiov) { |
2260 | qemu_iovec_destroy(mcb->callbacks[i].free_qiov); | |
2261 | } | |
40b4f539 | 2262 | qemu_free(mcb->callbacks[i].free_qiov); |
f8a83245 | 2263 | qemu_vfree(mcb->callbacks[i].free_buf); |
40b4f539 KW |
2264 | } |
2265 | } | |
2266 | ||
2267 | static void multiwrite_cb(void *opaque, int ret) | |
2268 | { | |
2269 | MultiwriteCB *mcb = opaque; | |
2270 | ||
6d519a5f SH |
2271 | trace_multiwrite_cb(mcb, ret); |
2272 | ||
cb6d3ca0 | 2273 | if (ret < 0 && !mcb->error) { |
40b4f539 | 2274 | mcb->error = ret; |
40b4f539 KW |
2275 | } |
2276 | ||
2277 | mcb->num_requests--; | |
2278 | if (mcb->num_requests == 0) { | |
de189a1b | 2279 | multiwrite_user_cb(mcb); |
40b4f539 KW |
2280 | qemu_free(mcb); |
2281 | } | |
2282 | } | |
2283 | ||
2284 | static int multiwrite_req_compare(const void *a, const void *b) | |
2285 | { | |
77be4366 CH |
2286 | const BlockRequest *req1 = a, *req2 = b; |
2287 | ||
2288 | /* | |
2289 | * Note that we can't simply subtract req2->sector from req1->sector | |
2290 | * here as that could overflow the return value. | |
2291 | */ | |
2292 | if (req1->sector > req2->sector) { | |
2293 | return 1; | |
2294 | } else if (req1->sector < req2->sector) { | |
2295 | return -1; | |
2296 | } else { | |
2297 | return 0; | |
2298 | } | |
40b4f539 KW |
2299 | } |
2300 | ||
2301 | /* | |
2302 | * Takes a bunch of requests and tries to merge them. Returns the number of | |
2303 | * requests that remain after merging. | |
2304 | */ | |
2305 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, | |
2306 | int num_reqs, MultiwriteCB *mcb) | |
2307 | { | |
2308 | int i, outidx; | |
2309 | ||
2310 | // Sort requests by start sector | |
2311 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); | |
2312 | ||
2313 | // Check if adjacent requests touch the same clusters. If so, combine them, | |
2314 | // filling up gaps with zero sectors. | |
2315 | outidx = 0; | |
2316 | for (i = 1; i < num_reqs; i++) { | |
2317 | int merge = 0; | |
2318 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; | |
2319 | ||
2320 | // This handles the cases that are valid for all block drivers, namely | |
2321 | // exactly sequential writes and overlapping writes. | |
2322 | if (reqs[i].sector <= oldreq_last) { | |
2323 | merge = 1; | |
2324 | } | |
2325 | ||
2326 | // The block driver may decide that it makes sense to combine requests | |
2327 | // even if there is a gap of some sectors between them. In this case, | |
2328 | // the gap is filled with zeros (therefore only applicable for yet | |
2329 | // unused space in format like qcow2). | |
2330 | if (!merge && bs->drv->bdrv_merge_requests) { | |
2331 | merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]); | |
2332 | } | |
2333 | ||
e2a305fb CH |
2334 | if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
2335 | merge = 0; | |
2336 | } | |
2337 | ||
40b4f539 KW |
2338 | if (merge) { |
2339 | size_t size; | |
2340 | QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov)); | |
2341 | qemu_iovec_init(qiov, | |
2342 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); | |
2343 | ||
2344 | // Add the first request to the merged one. If the requests are | |
2345 | // overlapping, drop the last sectors of the first request. | |
2346 | size = (reqs[i].sector - reqs[outidx].sector) << 9; | |
2347 | qemu_iovec_concat(qiov, reqs[outidx].qiov, size); | |
2348 | ||
2349 | // We might need to add some zeros between the two requests | |
2350 | if (reqs[i].sector > oldreq_last) { | |
2351 | size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9; | |
2352 | uint8_t *buf = qemu_blockalign(bs, zero_bytes); | |
2353 | memset(buf, 0, zero_bytes); | |
2354 | qemu_iovec_add(qiov, buf, zero_bytes); | |
2355 | mcb->callbacks[i].free_buf = buf; | |
2356 | } | |
2357 | ||
2358 | // Add the second request | |
2359 | qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size); | |
2360 | ||
cbf1dff2 | 2361 | reqs[outidx].nb_sectors = qiov->size >> 9; |
40b4f539 KW |
2362 | reqs[outidx].qiov = qiov; |
2363 | ||
2364 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; | |
2365 | } else { | |
2366 | outidx++; | |
2367 | reqs[outidx].sector = reqs[i].sector; | |
2368 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; | |
2369 | reqs[outidx].qiov = reqs[i].qiov; | |
2370 | } | |
2371 | } | |
2372 | ||
2373 | return outidx + 1; | |
2374 | } | |
2375 | ||
2376 | /* | |
2377 | * Submit multiple AIO write requests at once. | |
2378 | * | |
2379 | * On success, the function returns 0 and all requests in the reqs array have | |
2380 | * been submitted. In error case this function returns -1, and any of the | |
2381 | * requests may or may not be submitted yet. In particular, this means that the | |
2382 | * callback will be called for some of the requests, for others it won't. The | |
2383 | * caller must check the error field of the BlockRequest to wait for the right | |
2384 | * callbacks (if error != 0, no callback will be called). | |
2385 | * | |
2386 | * The implementation may modify the contents of the reqs array, e.g. to merge | |
2387 | * requests. However, the fields opaque and error are left unmodified as they | |
2388 | * are used to signal failure for a single request to the caller. | |
2389 | */ | |
2390 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) | |
2391 | { | |
2392 | BlockDriverAIOCB *acb; | |
2393 | MultiwriteCB *mcb; | |
2394 | int i; | |
2395 | ||
301db7c2 RH |
2396 | /* don't submit writes if we don't have a medium */ |
2397 | if (bs->drv == NULL) { | |
2398 | for (i = 0; i < num_reqs; i++) { | |
2399 | reqs[i].error = -ENOMEDIUM; | |
2400 | } | |
2401 | return -1; | |
2402 | } | |
2403 | ||
40b4f539 KW |
2404 | if (num_reqs == 0) { |
2405 | return 0; | |
2406 | } | |
2407 | ||
2408 | // Create MultiwriteCB structure | |
2409 | mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); | |
2410 | mcb->num_requests = 0; | |
2411 | mcb->num_callbacks = num_reqs; | |
2412 | ||
2413 | for (i = 0; i < num_reqs; i++) { | |
2414 | mcb->callbacks[i].cb = reqs[i].cb; | |
2415 | mcb->callbacks[i].opaque = reqs[i].opaque; | |
2416 | } | |
2417 | ||
2418 | // Check for mergable requests | |
2419 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); | |
2420 | ||
6d519a5f SH |
2421 | trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs); |
2422 | ||
453f9a16 KW |
2423 | /* |
2424 | * Run the aio requests. As soon as one request can't be submitted | |
2425 | * successfully, fail all requests that are not yet submitted (we must | |
2426 | * return failure for all requests anyway) | |
2427 | * | |
2428 | * num_requests cannot be set to the right value immediately: If | |
2429 | * bdrv_aio_writev fails for some request, num_requests would be too high | |
2430 | * and therefore multiwrite_cb() would never recognize the multiwrite | |
2431 | * request as completed. We also cannot use the loop variable i to set it | |
2432 | * when the first request fails because the callback may already have been | |
2433 | * called for previously submitted requests. Thus, num_requests must be | |
2434 | * incremented for each request that is submitted. | |
2435 | * | |
2436 | * The problem that callbacks may be called early also means that we need | |
2437 | * to take care that num_requests doesn't become 0 before all requests are | |
2438 | * submitted - multiwrite_cb() would consider the multiwrite request | |
2439 | * completed. A dummy request that is "completed" by a manual call to | |
2440 | * multiwrite_cb() takes care of this. | |
2441 | */ | |
2442 | mcb->num_requests = 1; | |
2443 | ||
6d519a5f | 2444 | // Run the aio requests |
40b4f539 | 2445 | for (i = 0; i < num_reqs; i++) { |
453f9a16 | 2446 | mcb->num_requests++; |
40b4f539 KW |
2447 | acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, |
2448 | reqs[i].nb_sectors, multiwrite_cb, mcb); | |
2449 | ||
2450 | if (acb == NULL) { | |
2451 | // We can only fail the whole thing if no request has been | |
2452 | // submitted yet. Otherwise we'll wait for the submitted AIOs to | |
2453 | // complete and report the error in the callback. | |
453f9a16 | 2454 | if (i == 0) { |
6d519a5f | 2455 | trace_bdrv_aio_multiwrite_earlyfail(mcb); |
40b4f539 KW |
2456 | goto fail; |
2457 | } else { | |
6d519a5f | 2458 | trace_bdrv_aio_multiwrite_latefail(mcb, i); |
7eb58a6c | 2459 | multiwrite_cb(mcb, -EIO); |
40b4f539 KW |
2460 | break; |
2461 | } | |
40b4f539 KW |
2462 | } |
2463 | } | |
2464 | ||
453f9a16 KW |
2465 | /* Complete the dummy request */ |
2466 | multiwrite_cb(mcb, 0); | |
2467 | ||
40b4f539 KW |
2468 | return 0; |
2469 | ||
2470 | fail: | |
453f9a16 KW |
2471 | for (i = 0; i < mcb->num_callbacks; i++) { |
2472 | reqs[i].error = -EIO; | |
2473 | } | |
af474591 | 2474 | qemu_free(mcb); |
40b4f539 KW |
2475 | return -1; |
2476 | } | |
2477 | ||
b2e12bc6 CH |
2478 | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
2479 | BlockDriverCompletionFunc *cb, void *opaque) | |
2480 | { | |
2481 | BlockDriver *drv = bs->drv; | |
2482 | ||
a13aac04 SH |
2483 | trace_bdrv_aio_flush(bs, opaque); |
2484 | ||
016f5cf6 AG |
2485 | if (bs->open_flags & BDRV_O_NO_FLUSH) { |
2486 | return bdrv_aio_noop_em(bs, cb, opaque); | |
2487 | } | |
2488 | ||
b2e12bc6 CH |
2489 | if (!drv) |
2490 | return NULL; | |
b2e12bc6 CH |
2491 | return drv->bdrv_aio_flush(bs, cb, opaque); |
2492 | } | |
2493 | ||
83f64091 | 2494 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) |
83f64091 | 2495 | { |
6bbff9a0 | 2496 | acb->pool->cancel(acb); |
83f64091 FB |
2497 | } |
2498 | ||
ce1a14dc | 2499 | |
83f64091 FB |
2500 | /**************************************************************/ |
2501 | /* async block device emulation */ | |
2502 | ||
c16b5a2c CH |
2503 | typedef struct BlockDriverAIOCBSync { |
2504 | BlockDriverAIOCB common; | |
2505 | QEMUBH *bh; | |
2506 | int ret; | |
2507 | /* vector translation state */ | |
2508 | QEMUIOVector *qiov; | |
2509 | uint8_t *bounce; | |
2510 | int is_write; | |
2511 | } BlockDriverAIOCBSync; | |
2512 | ||
2513 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) | |
2514 | { | |
b666d239 KW |
2515 | BlockDriverAIOCBSync *acb = |
2516 | container_of(blockacb, BlockDriverAIOCBSync, common); | |
6a7ad299 | 2517 | qemu_bh_delete(acb->bh); |
36afc451 | 2518 | acb->bh = NULL; |
c16b5a2c CH |
2519 | qemu_aio_release(acb); |
2520 | } | |
2521 | ||
2522 | static AIOPool bdrv_em_aio_pool = { | |
2523 | .aiocb_size = sizeof(BlockDriverAIOCBSync), | |
2524 | .cancel = bdrv_aio_cancel_em, | |
2525 | }; | |
2526 | ||
ce1a14dc | 2527 | static void bdrv_aio_bh_cb(void *opaque) |
83f64091 | 2528 | { |
ce1a14dc | 2529 | BlockDriverAIOCBSync *acb = opaque; |
f141eafe | 2530 | |
f141eafe AL |
2531 | if (!acb->is_write) |
2532 | qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); | |
ceb42de8 | 2533 | qemu_vfree(acb->bounce); |
ce1a14dc | 2534 | acb->common.cb(acb->common.opaque, acb->ret); |
6a7ad299 | 2535 | qemu_bh_delete(acb->bh); |
36afc451 | 2536 | acb->bh = NULL; |
ce1a14dc | 2537 | qemu_aio_release(acb); |
83f64091 | 2538 | } |
beac80cd | 2539 | |
f141eafe AL |
2540 | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, |
2541 | int64_t sector_num, | |
2542 | QEMUIOVector *qiov, | |
2543 | int nb_sectors, | |
2544 | BlockDriverCompletionFunc *cb, | |
2545 | void *opaque, | |
2546 | int is_write) | |
2547 | ||
83f64091 | 2548 | { |
ce1a14dc | 2549 | BlockDriverAIOCBSync *acb; |
ce1a14dc | 2550 | |
c16b5a2c | 2551 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
f141eafe AL |
2552 | acb->is_write = is_write; |
2553 | acb->qiov = qiov; | |
e268ca52 | 2554 | acb->bounce = qemu_blockalign(bs, qiov->size); |
f141eafe | 2555 | |
ce1a14dc PB |
2556 | if (!acb->bh) |
2557 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
f141eafe AL |
2558 | |
2559 | if (is_write) { | |
2560 | qemu_iovec_to_buffer(acb->qiov, acb->bounce); | |
2561 | acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors); | |
2562 | } else { | |
2563 | acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors); | |
2564 | } | |
2565 | ||
ce1a14dc | 2566 | qemu_bh_schedule(acb->bh); |
f141eafe | 2567 | |
ce1a14dc | 2568 | return &acb->common; |
beac80cd FB |
2569 | } |
2570 | ||
f141eafe AL |
2571 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, |
2572 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
ce1a14dc | 2573 | BlockDriverCompletionFunc *cb, void *opaque) |
beac80cd | 2574 | { |
f141eafe AL |
2575 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
2576 | } | |
83f64091 | 2577 | |
f141eafe AL |
2578 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, |
2579 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
2580 | BlockDriverCompletionFunc *cb, void *opaque) | |
2581 | { | |
2582 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); | |
beac80cd | 2583 | } |
beac80cd | 2584 | |
b2e12bc6 CH |
2585 | static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, |
2586 | BlockDriverCompletionFunc *cb, void *opaque) | |
2587 | { | |
2588 | BlockDriverAIOCBSync *acb; | |
2589 | ||
2590 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); | |
2591 | acb->is_write = 1; /* don't bounce in the completion hadler */ | |
2592 | acb->qiov = NULL; | |
2593 | acb->bounce = NULL; | |
2594 | acb->ret = 0; | |
2595 | ||
2596 | if (!acb->bh) | |
2597 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
2598 | ||
2599 | bdrv_flush(bs); | |
2600 | qemu_bh_schedule(acb->bh); | |
2601 | return &acb->common; | |
2602 | } | |
2603 | ||
016f5cf6 AG |
2604 | static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs, |
2605 | BlockDriverCompletionFunc *cb, void *opaque) | |
2606 | { | |
2607 | BlockDriverAIOCBSync *acb; | |
2608 | ||
2609 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); | |
2610 | acb->is_write = 1; /* don't bounce in the completion handler */ | |
2611 | acb->qiov = NULL; | |
2612 | acb->bounce = NULL; | |
2613 | acb->ret = 0; | |
2614 | ||
2615 | if (!acb->bh) { | |
2616 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
2617 | } | |
2618 | ||
2619 | qemu_bh_schedule(acb->bh); | |
2620 | return &acb->common; | |
2621 | } | |
2622 | ||
83f64091 FB |
2623 | /**************************************************************/ |
2624 | /* sync block device emulation */ | |
ea2384d3 | 2625 | |
83f64091 FB |
2626 | static void bdrv_rw_em_cb(void *opaque, int ret) |
2627 | { | |
2628 | *(int *)opaque = ret; | |
ea2384d3 FB |
2629 | } |
2630 | ||
83f64091 FB |
2631 | #define NOT_DONE 0x7fffffff |
2632 | ||
5fafdf24 | 2633 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
83f64091 | 2634 | uint8_t *buf, int nb_sectors) |
7a6cba61 | 2635 | { |
ce1a14dc PB |
2636 | int async_ret; |
2637 | BlockDriverAIOCB *acb; | |
f141eafe AL |
2638 | struct iovec iov; |
2639 | QEMUIOVector qiov; | |
83f64091 | 2640 | |
65d6b3d8 KW |
2641 | async_context_push(); |
2642 | ||
83f64091 | 2643 | async_ret = NOT_DONE; |
3f4cb3d3 | 2644 | iov.iov_base = (void *)buf; |
eb5a3165 | 2645 | iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE; |
f141eafe AL |
2646 | qemu_iovec_init_external(&qiov, &iov, 1); |
2647 | acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors, | |
2648 | bdrv_rw_em_cb, &async_ret); | |
65d6b3d8 KW |
2649 | if (acb == NULL) { |
2650 | async_ret = -1; | |
2651 | goto fail; | |
2652 | } | |
baf35cb9 | 2653 | |
83f64091 FB |
2654 | while (async_ret == NOT_DONE) { |
2655 | qemu_aio_wait(); | |
2656 | } | |
baf35cb9 | 2657 | |
65d6b3d8 KW |
2658 | |
2659 | fail: | |
2660 | async_context_pop(); | |
83f64091 | 2661 | return async_ret; |
7a6cba61 PB |
2662 | } |
2663 | ||
83f64091 FB |
2664 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
2665 | const uint8_t *buf, int nb_sectors) | |
2666 | { | |
ce1a14dc PB |
2667 | int async_ret; |
2668 | BlockDriverAIOCB *acb; | |
f141eafe AL |
2669 | struct iovec iov; |
2670 | QEMUIOVector qiov; | |
83f64091 | 2671 | |
65d6b3d8 KW |
2672 | async_context_push(); |
2673 | ||
83f64091 | 2674 | async_ret = NOT_DONE; |
f141eafe | 2675 | iov.iov_base = (void *)buf; |
eb5a3165 | 2676 | iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE; |
f141eafe AL |
2677 | qemu_iovec_init_external(&qiov, &iov, 1); |
2678 | acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors, | |
2679 | bdrv_rw_em_cb, &async_ret); | |
65d6b3d8 KW |
2680 | if (acb == NULL) { |
2681 | async_ret = -1; | |
2682 | goto fail; | |
2683 | } | |
83f64091 FB |
2684 | while (async_ret == NOT_DONE) { |
2685 | qemu_aio_wait(); | |
2686 | } | |
65d6b3d8 KW |
2687 | |
2688 | fail: | |
2689 | async_context_pop(); | |
83f64091 FB |
2690 | return async_ret; |
2691 | } | |
ea2384d3 FB |
2692 | |
2693 | void bdrv_init(void) | |
2694 | { | |
5efa9d5a | 2695 | module_call_init(MODULE_INIT_BLOCK); |
ea2384d3 | 2696 | } |
ce1a14dc | 2697 | |
eb852011 MA |
2698 | void bdrv_init_with_whitelist(void) |
2699 | { | |
2700 | use_bdrv_whitelist = 1; | |
2701 | bdrv_init(); | |
2702 | } | |
2703 | ||
c16b5a2c CH |
2704 | void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs, |
2705 | BlockDriverCompletionFunc *cb, void *opaque) | |
ce1a14dc | 2706 | { |
ce1a14dc PB |
2707 | BlockDriverAIOCB *acb; |
2708 | ||
6bbff9a0 AL |
2709 | if (pool->free_aiocb) { |
2710 | acb = pool->free_aiocb; | |
2711 | pool->free_aiocb = acb->next; | |
ce1a14dc | 2712 | } else { |
6bbff9a0 AL |
2713 | acb = qemu_mallocz(pool->aiocb_size); |
2714 | acb->pool = pool; | |
ce1a14dc PB |
2715 | } |
2716 | acb->bs = bs; | |
2717 | acb->cb = cb; | |
2718 | acb->opaque = opaque; | |
2719 | return acb; | |
2720 | } | |
2721 | ||
2722 | void qemu_aio_release(void *p) | |
2723 | { | |
6bbff9a0 AL |
2724 | BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; |
2725 | AIOPool *pool = acb->pool; | |
2726 | acb->next = pool->free_aiocb; | |
2727 | pool->free_aiocb = acb; | |
ce1a14dc | 2728 | } |
19cb3738 FB |
2729 | |
2730 | /**************************************************************/ | |
2731 | /* removable device support */ | |
2732 | ||
2733 | /** | |
2734 | * Return TRUE if the media is present | |
2735 | */ | |
2736 | int bdrv_is_inserted(BlockDriverState *bs) | |
2737 | { | |
2738 | BlockDriver *drv = bs->drv; | |
2739 | int ret; | |
2740 | if (!drv) | |
2741 | return 0; | |
2742 | if (!drv->bdrv_is_inserted) | |
4be9762a | 2743 | return !bs->tray_open; |
19cb3738 FB |
2744 | ret = drv->bdrv_is_inserted(bs); |
2745 | return ret; | |
2746 | } | |
2747 | ||
2748 | /** | |
2749 | * Return TRUE if the media changed since the last call to this | |
5fafdf24 | 2750 | * function. It is currently only used for floppy disks |
19cb3738 FB |
2751 | */ |
2752 | int bdrv_media_changed(BlockDriverState *bs) | |
2753 | { | |
2754 | BlockDriver *drv = bs->drv; | |
2755 | int ret; | |
2756 | ||
2757 | if (!drv || !drv->bdrv_media_changed) | |
2758 | ret = -ENOTSUP; | |
2759 | else | |
2760 | ret = drv->bdrv_media_changed(bs); | |
2761 | if (ret == -ENOTSUP) | |
2762 | ret = bs->media_changed; | |
2763 | bs->media_changed = 0; | |
2764 | return ret; | |
2765 | } | |
2766 | ||
2767 | /** | |
2768 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
2769 | */ | |
aea2a33c | 2770 | int bdrv_eject(BlockDriverState *bs, int eject_flag) |
19cb3738 FB |
2771 | { |
2772 | BlockDriver *drv = bs->drv; | |
19cb3738 | 2773 | |
aea2a33c MM |
2774 | if (bs->locked) { |
2775 | return -EBUSY; | |
2776 | } | |
2777 | ||
822e1cd1 MA |
2778 | if (drv && drv->bdrv_eject) { |
2779 | drv->bdrv_eject(bs, eject_flag); | |
19cb3738 | 2780 | } |
822e1cd1 MA |
2781 | bs->tray_open = eject_flag; |
2782 | return 0; | |
19cb3738 FB |
2783 | } |
2784 | ||
2785 | int bdrv_is_locked(BlockDriverState *bs) | |
2786 | { | |
2787 | return bs->locked; | |
2788 | } | |
2789 | ||
2790 | /** | |
2791 | * Lock or unlock the media (if it is locked, the user won't be able | |
2792 | * to eject it manually). | |
2793 | */ | |
2794 | void bdrv_set_locked(BlockDriverState *bs, int locked) | |
2795 | { | |
2796 | BlockDriver *drv = bs->drv; | |
2797 | ||
b8c6d095 SH |
2798 | trace_bdrv_set_locked(bs, locked); |
2799 | ||
19cb3738 FB |
2800 | bs->locked = locked; |
2801 | if (drv && drv->bdrv_set_locked) { | |
2802 | drv->bdrv_set_locked(bs, locked); | |
2803 | } | |
2804 | } | |
985a03b0 TS |
2805 | |
2806 | /* needed for generic scsi interface */ | |
2807 | ||
2808 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
2809 | { | |
2810 | BlockDriver *drv = bs->drv; | |
2811 | ||
2812 | if (drv && drv->bdrv_ioctl) | |
2813 | return drv->bdrv_ioctl(bs, req, buf); | |
2814 | return -ENOTSUP; | |
2815 | } | |
7d780669 | 2816 | |
221f715d AL |
2817 | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
2818 | unsigned long int req, void *buf, | |
2819 | BlockDriverCompletionFunc *cb, void *opaque) | |
7d780669 | 2820 | { |
221f715d | 2821 | BlockDriver *drv = bs->drv; |
7d780669 | 2822 | |
221f715d AL |
2823 | if (drv && drv->bdrv_aio_ioctl) |
2824 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); | |
2825 | return NULL; | |
7d780669 | 2826 | } |
e268ca52 | 2827 | |
7cd1e32a LS |
2828 | |
2829 | ||
e268ca52 AL |
2830 | void *qemu_blockalign(BlockDriverState *bs, size_t size) |
2831 | { | |
2832 | return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); | |
2833 | } | |
7cd1e32a LS |
2834 | |
2835 | void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable) | |
2836 | { | |
2837 | int64_t bitmap_size; | |
a55eb92c | 2838 | |
aaa0eb75 | 2839 | bs->dirty_count = 0; |
a55eb92c | 2840 | if (enable) { |
c6d22830 JK |
2841 | if (!bs->dirty_bitmap) { |
2842 | bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) + | |
2843 | BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1; | |
2844 | bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8; | |
a55eb92c | 2845 | |
7cd1e32a | 2846 | bs->dirty_bitmap = qemu_mallocz(bitmap_size); |
a55eb92c | 2847 | } |
7cd1e32a | 2848 | } else { |
c6d22830 | 2849 | if (bs->dirty_bitmap) { |
7cd1e32a | 2850 | qemu_free(bs->dirty_bitmap); |
c6d22830 | 2851 | bs->dirty_bitmap = NULL; |
a55eb92c | 2852 | } |
7cd1e32a LS |
2853 | } |
2854 | } | |
2855 | ||
2856 | int bdrv_get_dirty(BlockDriverState *bs, int64_t sector) | |
2857 | { | |
6ea44308 | 2858 | int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; |
a55eb92c | 2859 | |
c6d22830 JK |
2860 | if (bs->dirty_bitmap && |
2861 | (sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) { | |
6d59fec1 MT |
2862 | return !!(bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] & |
2863 | (1UL << (chunk % (sizeof(unsigned long) * 8)))); | |
7cd1e32a LS |
2864 | } else { |
2865 | return 0; | |
2866 | } | |
2867 | } | |
2868 | ||
a55eb92c JK |
2869 | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, |
2870 | int nr_sectors) | |
7cd1e32a LS |
2871 | { |
2872 | set_dirty_bitmap(bs, cur_sector, nr_sectors, 0); | |
2873 | } | |
aaa0eb75 LS |
2874 | |
2875 | int64_t bdrv_get_dirty_count(BlockDriverState *bs) | |
2876 | { | |
2877 | return bs->dirty_count; | |
2878 | } | |
f88e1a42 | 2879 | |
db593f25 MT |
2880 | void bdrv_set_in_use(BlockDriverState *bs, int in_use) |
2881 | { | |
2882 | assert(bs->in_use != in_use); | |
2883 | bs->in_use = in_use; | |
2884 | } | |
2885 | ||
2886 | int bdrv_in_use(BlockDriverState *bs) | |
2887 | { | |
2888 | return bs->in_use; | |
2889 | } | |
2890 | ||
f88e1a42 JS |
2891 | int bdrv_img_create(const char *filename, const char *fmt, |
2892 | const char *base_filename, const char *base_fmt, | |
2893 | char *options, uint64_t img_size, int flags) | |
2894 | { | |
2895 | QEMUOptionParameter *param = NULL, *create_options = NULL; | |
d220894e | 2896 | QEMUOptionParameter *backing_fmt, *backing_file, *size; |
f88e1a42 JS |
2897 | BlockDriverState *bs = NULL; |
2898 | BlockDriver *drv, *proto_drv; | |
96df67d1 | 2899 | BlockDriver *backing_drv = NULL; |
f88e1a42 JS |
2900 | int ret = 0; |
2901 | ||
2902 | /* Find driver and parse its options */ | |
2903 | drv = bdrv_find_format(fmt); | |
2904 | if (!drv) { | |
2905 | error_report("Unknown file format '%s'", fmt); | |
4f70f249 | 2906 | ret = -EINVAL; |
f88e1a42 JS |
2907 | goto out; |
2908 | } | |
2909 | ||
2910 | proto_drv = bdrv_find_protocol(filename); | |
2911 | if (!proto_drv) { | |
2912 | error_report("Unknown protocol '%s'", filename); | |
4f70f249 | 2913 | ret = -EINVAL; |
f88e1a42 JS |
2914 | goto out; |
2915 | } | |
2916 | ||
2917 | create_options = append_option_parameters(create_options, | |
2918 | drv->create_options); | |
2919 | create_options = append_option_parameters(create_options, | |
2920 | proto_drv->create_options); | |
2921 | ||
2922 | /* Create parameter list with default values */ | |
2923 | param = parse_option_parameters("", create_options, param); | |
2924 | ||
2925 | set_option_parameter_int(param, BLOCK_OPT_SIZE, img_size); | |
2926 | ||
2927 | /* Parse -o options */ | |
2928 | if (options) { | |
2929 | param = parse_option_parameters(options, create_options, param); | |
2930 | if (param == NULL) { | |
2931 | error_report("Invalid options for file format '%s'.", fmt); | |
4f70f249 | 2932 | ret = -EINVAL; |
f88e1a42 JS |
2933 | goto out; |
2934 | } | |
2935 | } | |
2936 | ||
2937 | if (base_filename) { | |
2938 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FILE, | |
2939 | base_filename)) { | |
2940 | error_report("Backing file not supported for file format '%s'", | |
2941 | fmt); | |
4f70f249 | 2942 | ret = -EINVAL; |
f88e1a42 JS |
2943 | goto out; |
2944 | } | |
2945 | } | |
2946 | ||
2947 | if (base_fmt) { | |
2948 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FMT, base_fmt)) { | |
2949 | error_report("Backing file format not supported for file " | |
2950 | "format '%s'", fmt); | |
4f70f249 | 2951 | ret = -EINVAL; |
f88e1a42 JS |
2952 | goto out; |
2953 | } | |
2954 | } | |
2955 | ||
792da93a JS |
2956 | backing_file = get_option_parameter(param, BLOCK_OPT_BACKING_FILE); |
2957 | if (backing_file && backing_file->value.s) { | |
2958 | if (!strcmp(filename, backing_file->value.s)) { | |
2959 | error_report("Error: Trying to create an image with the " | |
2960 | "same filename as the backing file"); | |
4f70f249 | 2961 | ret = -EINVAL; |
792da93a JS |
2962 | goto out; |
2963 | } | |
2964 | } | |
2965 | ||
f88e1a42 JS |
2966 | backing_fmt = get_option_parameter(param, BLOCK_OPT_BACKING_FMT); |
2967 | if (backing_fmt && backing_fmt->value.s) { | |
96df67d1 SH |
2968 | backing_drv = bdrv_find_format(backing_fmt->value.s); |
2969 | if (!backing_drv) { | |
f88e1a42 JS |
2970 | error_report("Unknown backing file format '%s'", |
2971 | backing_fmt->value.s); | |
4f70f249 | 2972 | ret = -EINVAL; |
f88e1a42 JS |
2973 | goto out; |
2974 | } | |
2975 | } | |
2976 | ||
2977 | // The size for the image must always be specified, with one exception: | |
2978 | // If we are using a backing file, we can obtain the size from there | |
d220894e KW |
2979 | size = get_option_parameter(param, BLOCK_OPT_SIZE); |
2980 | if (size && size->value.n == -1) { | |
f88e1a42 JS |
2981 | if (backing_file && backing_file->value.s) { |
2982 | uint64_t size; | |
f88e1a42 JS |
2983 | char buf[32]; |
2984 | ||
f88e1a42 JS |
2985 | bs = bdrv_new(""); |
2986 | ||
96df67d1 | 2987 | ret = bdrv_open(bs, backing_file->value.s, flags, backing_drv); |
f88e1a42 | 2988 | if (ret < 0) { |
96df67d1 | 2989 | error_report("Could not open '%s'", backing_file->value.s); |
f88e1a42 JS |
2990 | goto out; |
2991 | } | |
2992 | bdrv_get_geometry(bs, &size); | |
2993 | size *= 512; | |
2994 | ||
2995 | snprintf(buf, sizeof(buf), "%" PRId64, size); | |
2996 | set_option_parameter(param, BLOCK_OPT_SIZE, buf); | |
2997 | } else { | |
2998 | error_report("Image creation needs a size parameter"); | |
4f70f249 | 2999 | ret = -EINVAL; |
f88e1a42 JS |
3000 | goto out; |
3001 | } | |
3002 | } | |
3003 | ||
3004 | printf("Formatting '%s', fmt=%s ", filename, fmt); | |
3005 | print_option_parameters(param); | |
3006 | puts(""); | |
3007 | ||
3008 | ret = bdrv_create(drv, filename, param); | |
3009 | ||
3010 | if (ret < 0) { | |
3011 | if (ret == -ENOTSUP) { | |
3012 | error_report("Formatting or formatting option not supported for " | |
3013 | "file format '%s'", fmt); | |
3014 | } else if (ret == -EFBIG) { | |
3015 | error_report("The image size is too large for file format '%s'", | |
3016 | fmt); | |
3017 | } else { | |
3018 | error_report("%s: error while creating %s: %s", filename, fmt, | |
3019 | strerror(-ret)); | |
3020 | } | |
3021 | } | |
3022 | ||
3023 | out: | |
3024 | free_option_parameters(create_options); | |
3025 | free_option_parameters(param); | |
3026 | ||
3027 | if (bs) { | |
3028 | bdrv_delete(bs); | |
3029 | } | |
4f70f249 JS |
3030 | |
3031 | return ret; | |
f88e1a42 | 3032 | } |