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1 | /* | |
2 | * QEMU System Emulator block driver | |
3 | * | |
4 | * Copyright (c) 2003 Fabrice Bellard | |
5 | * | |
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 | */ | |
24 | #include "config-host.h" | |
25 | #include "qemu-common.h" | |
26 | #include "monitor.h" | |
27 | #include "block_int.h" | |
28 | #include "module.h" | |
29 | #include "qemu-objects.h" | |
30 | ||
31 | #ifdef CONFIG_BSD | |
32 | #include <sys/types.h> | |
33 | #include <sys/stat.h> | |
34 | #include <sys/ioctl.h> | |
35 | #include <sys/queue.h> | |
36 | #ifndef __DragonFly__ | |
37 | #include <sys/disk.h> | |
38 | #endif | |
39 | #endif | |
40 | ||
41 | #ifdef _WIN32 | |
42 | #include <windows.h> | |
43 | #endif | |
44 | ||
45 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, | |
46 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
47 | BlockDriverCompletionFunc *cb, void *opaque); | |
48 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, | |
49 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
50 | BlockDriverCompletionFunc *cb, void *opaque); | |
51 | static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, | |
52 | BlockDriverCompletionFunc *cb, void *opaque); | |
53 | static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs, | |
54 | BlockDriverCompletionFunc *cb, void *opaque); | |
55 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, | |
56 | uint8_t *buf, int nb_sectors); | |
57 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, | |
58 | const uint8_t *buf, int nb_sectors); | |
59 | ||
60 | static QTAILQ_HEAD(, BlockDriverState) bdrv_states = | |
61 | QTAILQ_HEAD_INITIALIZER(bdrv_states); | |
62 | ||
63 | static QLIST_HEAD(, BlockDriver) bdrv_drivers = | |
64 | QLIST_HEAD_INITIALIZER(bdrv_drivers); | |
65 | ||
66 | /* If non-zero, use only whitelisted block drivers */ | |
67 | static int use_bdrv_whitelist; | |
68 | ||
69 | int path_is_absolute(const char *path) | |
70 | { | |
71 | const char *p; | |
72 | #ifdef _WIN32 | |
73 | /* specific case for names like: "\\.\d:" */ | |
74 | if (*path == '/' || *path == '\\') | |
75 | return 1; | |
76 | #endif | |
77 | p = strchr(path, ':'); | |
78 | if (p) | |
79 | p++; | |
80 | else | |
81 | p = path; | |
82 | #ifdef _WIN32 | |
83 | return (*p == '/' || *p == '\\'); | |
84 | #else | |
85 | return (*p == '/'); | |
86 | #endif | |
87 | } | |
88 | ||
89 | /* if filename is absolute, just copy it to dest. Otherwise, build a | |
90 | path to it by considering it is relative to base_path. URL are | |
91 | supported. */ | |
92 | void path_combine(char *dest, int dest_size, | |
93 | const char *base_path, | |
94 | const char *filename) | |
95 | { | |
96 | const char *p, *p1; | |
97 | int len; | |
98 | ||
99 | if (dest_size <= 0) | |
100 | return; | |
101 | if (path_is_absolute(filename)) { | |
102 | pstrcpy(dest, dest_size, filename); | |
103 | } else { | |
104 | p = strchr(base_path, ':'); | |
105 | if (p) | |
106 | p++; | |
107 | else | |
108 | p = base_path; | |
109 | p1 = strrchr(base_path, '/'); | |
110 | #ifdef _WIN32 | |
111 | { | |
112 | const char *p2; | |
113 | p2 = strrchr(base_path, '\\'); | |
114 | if (!p1 || p2 > p1) | |
115 | p1 = p2; | |
116 | } | |
117 | #endif | |
118 | if (p1) | |
119 | p1++; | |
120 | else | |
121 | p1 = base_path; | |
122 | if (p1 > p) | |
123 | p = p1; | |
124 | len = p - base_path; | |
125 | if (len > dest_size - 1) | |
126 | len = dest_size - 1; | |
127 | memcpy(dest, base_path, len); | |
128 | dest[len] = '\0'; | |
129 | pstrcat(dest, dest_size, filename); | |
130 | } | |
131 | } | |
132 | ||
133 | void bdrv_register(BlockDriver *bdrv) | |
134 | { | |
135 | if (!bdrv->bdrv_aio_readv) { | |
136 | /* add AIO emulation layer */ | |
137 | bdrv->bdrv_aio_readv = bdrv_aio_readv_em; | |
138 | bdrv->bdrv_aio_writev = bdrv_aio_writev_em; | |
139 | } else if (!bdrv->bdrv_read) { | |
140 | /* add synchronous IO emulation layer */ | |
141 | bdrv->bdrv_read = bdrv_read_em; | |
142 | bdrv->bdrv_write = bdrv_write_em; | |
143 | } | |
144 | ||
145 | if (!bdrv->bdrv_aio_flush) | |
146 | bdrv->bdrv_aio_flush = bdrv_aio_flush_em; | |
147 | ||
148 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); | |
149 | } | |
150 | ||
151 | /* create a new block device (by default it is empty) */ | |
152 | BlockDriverState *bdrv_new(const char *device_name) | |
153 | { | |
154 | BlockDriverState *bs; | |
155 | ||
156 | bs = qemu_mallocz(sizeof(BlockDriverState)); | |
157 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); | |
158 | if (device_name[0] != '\0') { | |
159 | QTAILQ_INSERT_TAIL(&bdrv_states, bs, list); | |
160 | } | |
161 | return bs; | |
162 | } | |
163 | ||
164 | BlockDriver *bdrv_find_format(const char *format_name) | |
165 | { | |
166 | BlockDriver *drv1; | |
167 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { | |
168 | if (!strcmp(drv1->format_name, format_name)) { | |
169 | return drv1; | |
170 | } | |
171 | } | |
172 | return NULL; | |
173 | } | |
174 | ||
175 | static int bdrv_is_whitelisted(BlockDriver *drv) | |
176 | { | |
177 | static const char *whitelist[] = { | |
178 | CONFIG_BDRV_WHITELIST | |
179 | }; | |
180 | const char **p; | |
181 | ||
182 | if (!whitelist[0]) | |
183 | return 1; /* no whitelist, anything goes */ | |
184 | ||
185 | for (p = whitelist; *p; p++) { | |
186 | if (!strcmp(drv->format_name, *p)) { | |
187 | return 1; | |
188 | } | |
189 | } | |
190 | return 0; | |
191 | } | |
192 | ||
193 | BlockDriver *bdrv_find_whitelisted_format(const char *format_name) | |
194 | { | |
195 | BlockDriver *drv = bdrv_find_format(format_name); | |
196 | return drv && bdrv_is_whitelisted(drv) ? drv : NULL; | |
197 | } | |
198 | ||
199 | int bdrv_create(BlockDriver *drv, const char* filename, | |
200 | QEMUOptionParameter *options) | |
201 | { | |
202 | if (!drv->bdrv_create) | |
203 | return -ENOTSUP; | |
204 | ||
205 | return drv->bdrv_create(filename, options); | |
206 | } | |
207 | ||
208 | int bdrv_create_file(const char* filename, QEMUOptionParameter *options) | |
209 | { | |
210 | BlockDriver *drv; | |
211 | ||
212 | drv = bdrv_find_protocol(filename); | |
213 | if (drv == NULL) { | |
214 | drv = bdrv_find_format("file"); | |
215 | } | |
216 | ||
217 | return bdrv_create(drv, filename, options); | |
218 | } | |
219 | ||
220 | #ifdef _WIN32 | |
221 | void get_tmp_filename(char *filename, int size) | |
222 | { | |
223 | char temp_dir[MAX_PATH]; | |
224 | ||
225 | GetTempPath(MAX_PATH, temp_dir); | |
226 | GetTempFileName(temp_dir, "qem", 0, filename); | |
227 | } | |
228 | #else | |
229 | void get_tmp_filename(char *filename, int size) | |
230 | { | |
231 | int fd; | |
232 | const char *tmpdir; | |
233 | /* XXX: race condition possible */ | |
234 | tmpdir = getenv("TMPDIR"); | |
235 | if (!tmpdir) | |
236 | tmpdir = "/tmp"; | |
237 | snprintf(filename, size, "%s/vl.XXXXXX", tmpdir); | |
238 | fd = mkstemp(filename); | |
239 | close(fd); | |
240 | } | |
241 | #endif | |
242 | ||
243 | #ifdef _WIN32 | |
244 | static int is_windows_drive_prefix(const char *filename) | |
245 | { | |
246 | return (((filename[0] >= 'a' && filename[0] <= 'z') || | |
247 | (filename[0] >= 'A' && filename[0] <= 'Z')) && | |
248 | filename[1] == ':'); | |
249 | } | |
250 | ||
251 | int is_windows_drive(const char *filename) | |
252 | { | |
253 | if (is_windows_drive_prefix(filename) && | |
254 | filename[2] == '\0') | |
255 | return 1; | |
256 | if (strstart(filename, "\\\\.\\", NULL) || | |
257 | strstart(filename, "//./", NULL)) | |
258 | return 1; | |
259 | return 0; | |
260 | } | |
261 | #endif | |
262 | ||
263 | /* | |
264 | * Detect host devices. By convention, /dev/cdrom[N] is always | |
265 | * recognized as a host CDROM. | |
266 | */ | |
267 | static BlockDriver *find_hdev_driver(const char *filename) | |
268 | { | |
269 | int score_max = 0, score; | |
270 | BlockDriver *drv = NULL, *d; | |
271 | ||
272 | QLIST_FOREACH(d, &bdrv_drivers, list) { | |
273 | if (d->bdrv_probe_device) { | |
274 | score = d->bdrv_probe_device(filename); | |
275 | if (score > score_max) { | |
276 | score_max = score; | |
277 | drv = d; | |
278 | } | |
279 | } | |
280 | } | |
281 | ||
282 | return drv; | |
283 | } | |
284 | ||
285 | BlockDriver *bdrv_find_protocol(const char *filename) | |
286 | { | |
287 | BlockDriver *drv1; | |
288 | char protocol[128]; | |
289 | int len; | |
290 | const char *p; | |
291 | int is_drive; | |
292 | ||
293 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ | |
294 | ||
295 | #ifdef _WIN32 | |
296 | is_drive = is_windows_drive(filename) || | |
297 | is_windows_drive_prefix(filename); | |
298 | #else | |
299 | is_drive = 0; | |
300 | #endif | |
301 | p = strchr(filename, ':'); | |
302 | if (!p || is_drive) { | |
303 | drv1 = find_hdev_driver(filename); | |
304 | if (!drv1) { | |
305 | drv1 = bdrv_find_format("file"); | |
306 | } | |
307 | return drv1; | |
308 | } | |
309 | len = p - filename; | |
310 | if (len > sizeof(protocol) - 1) | |
311 | len = sizeof(protocol) - 1; | |
312 | memcpy(protocol, filename, len); | |
313 | protocol[len] = '\0'; | |
314 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { | |
315 | if (drv1->protocol_name && | |
316 | !strcmp(drv1->protocol_name, protocol)) { | |
317 | return drv1; | |
318 | } | |
319 | } | |
320 | return NULL; | |
321 | } | |
322 | ||
323 | static BlockDriver *find_image_format(const char *filename) | |
324 | { | |
325 | int ret, score, score_max; | |
326 | BlockDriver *drv1, *drv; | |
327 | uint8_t buf[2048]; | |
328 | BlockDriverState *bs; | |
329 | ||
330 | ret = bdrv_file_open(&bs, filename, 0); | |
331 | if (ret < 0) | |
332 | return NULL; | |
333 | ||
334 | /* Return the raw BlockDriver * to scsi-generic devices */ | |
335 | if (bs->sg) | |
336 | return bdrv_find_format("raw"); | |
337 | ||
338 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); | |
339 | bdrv_delete(bs); | |
340 | if (ret < 0) { | |
341 | return NULL; | |
342 | } | |
343 | ||
344 | score_max = 0; | |
345 | drv = NULL; | |
346 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { | |
347 | if (drv1->bdrv_probe) { | |
348 | score = drv1->bdrv_probe(buf, ret, filename); | |
349 | if (score > score_max) { | |
350 | score_max = score; | |
351 | drv = drv1; | |
352 | } | |
353 | } | |
354 | } | |
355 | return drv; | |
356 | } | |
357 | ||
358 | /** | |
359 | * Set the current 'total_sectors' value | |
360 | */ | |
361 | static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) | |
362 | { | |
363 | BlockDriver *drv = bs->drv; | |
364 | ||
365 | /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */ | |
366 | if (bs->sg) | |
367 | return 0; | |
368 | ||
369 | /* query actual device if possible, otherwise just trust the hint */ | |
370 | if (drv->bdrv_getlength) { | |
371 | int64_t length = drv->bdrv_getlength(bs); | |
372 | if (length < 0) { | |
373 | return length; | |
374 | } | |
375 | hint = length >> BDRV_SECTOR_BITS; | |
376 | } | |
377 | ||
378 | bs->total_sectors = hint; | |
379 | return 0; | |
380 | } | |
381 | ||
382 | /* | |
383 | * Common part for opening disk images and files | |
384 | */ | |
385 | static int bdrv_open_common(BlockDriverState *bs, const char *filename, | |
386 | int flags, BlockDriver *drv) | |
387 | { | |
388 | int ret, open_flags; | |
389 | ||
390 | assert(drv != NULL); | |
391 | ||
392 | bs->file = NULL; | |
393 | bs->total_sectors = 0; | |
394 | bs->is_temporary = 0; | |
395 | bs->encrypted = 0; | |
396 | bs->valid_key = 0; | |
397 | bs->open_flags = flags; | |
398 | /* buffer_alignment defaulted to 512, drivers can change this value */ | |
399 | bs->buffer_alignment = 512; | |
400 | ||
401 | pstrcpy(bs->filename, sizeof(bs->filename), filename); | |
402 | ||
403 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) { | |
404 | return -ENOTSUP; | |
405 | } | |
406 | ||
407 | bs->drv = drv; | |
408 | bs->opaque = qemu_mallocz(drv->instance_size); | |
409 | ||
410 | /* | |
411 | * Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a | |
412 | * write cache to the guest. We do need the fdatasync to flush | |
413 | * out transactions for block allocations, and we maybe have a | |
414 | * volatile write cache in our backing device to deal with. | |
415 | */ | |
416 | if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE)) | |
417 | bs->enable_write_cache = 1; | |
418 | ||
419 | /* | |
420 | * Clear flags that are internal to the block layer before opening the | |
421 | * image. | |
422 | */ | |
423 | open_flags = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
424 | ||
425 | /* | |
426 | * Snapshots should be writeable. | |
427 | */ | |
428 | if (bs->is_temporary) { | |
429 | open_flags |= BDRV_O_RDWR; | |
430 | } | |
431 | ||
432 | /* Open the image, either directly or using a protocol */ | |
433 | if (drv->bdrv_file_open) { | |
434 | ret = drv->bdrv_file_open(bs, filename, open_flags); | |
435 | } else { | |
436 | ret = bdrv_file_open(&bs->file, filename, open_flags); | |
437 | if (ret >= 0) { | |
438 | ret = drv->bdrv_open(bs, open_flags); | |
439 | } | |
440 | } | |
441 | ||
442 | if (ret < 0) { | |
443 | goto free_and_fail; | |
444 | } | |
445 | ||
446 | bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR); | |
447 | ||
448 | ret = refresh_total_sectors(bs, bs->total_sectors); | |
449 | if (ret < 0) { | |
450 | goto free_and_fail; | |
451 | } | |
452 | ||
453 | #ifndef _WIN32 | |
454 | if (bs->is_temporary) { | |
455 | unlink(filename); | |
456 | } | |
457 | #endif | |
458 | return 0; | |
459 | ||
460 | free_and_fail: | |
461 | if (bs->file) { | |
462 | bdrv_delete(bs->file); | |
463 | bs->file = NULL; | |
464 | } | |
465 | qemu_free(bs->opaque); | |
466 | bs->opaque = NULL; | |
467 | bs->drv = NULL; | |
468 | return ret; | |
469 | } | |
470 | ||
471 | /* | |
472 | * Opens a file using a protocol (file, host_device, nbd, ...) | |
473 | */ | |
474 | int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) | |
475 | { | |
476 | BlockDriverState *bs; | |
477 | BlockDriver *drv; | |
478 | int ret; | |
479 | ||
480 | drv = bdrv_find_protocol(filename); | |
481 | if (!drv) { | |
482 | return -ENOENT; | |
483 | } | |
484 | ||
485 | bs = bdrv_new(""); | |
486 | ret = bdrv_open_common(bs, filename, flags, drv); | |
487 | if (ret < 0) { | |
488 | bdrv_delete(bs); | |
489 | return ret; | |
490 | } | |
491 | bs->growable = 1; | |
492 | *pbs = bs; | |
493 | return 0; | |
494 | } | |
495 | ||
496 | /* | |
497 | * Opens a disk image (raw, qcow2, vmdk, ...) | |
498 | */ | |
499 | int bdrv_open(BlockDriverState *bs, const char *filename, int flags, | |
500 | BlockDriver *drv) | |
501 | { | |
502 | int ret; | |
503 | ||
504 | if (flags & BDRV_O_SNAPSHOT) { | |
505 | BlockDriverState *bs1; | |
506 | int64_t total_size; | |
507 | int is_protocol = 0; | |
508 | BlockDriver *bdrv_qcow2; | |
509 | QEMUOptionParameter *options; | |
510 | char tmp_filename[PATH_MAX]; | |
511 | char backing_filename[PATH_MAX]; | |
512 | ||
513 | /* if snapshot, we create a temporary backing file and open it | |
514 | instead of opening 'filename' directly */ | |
515 | ||
516 | /* if there is a backing file, use it */ | |
517 | bs1 = bdrv_new(""); | |
518 | ret = bdrv_open(bs1, filename, 0, drv); | |
519 | if (ret < 0) { | |
520 | bdrv_delete(bs1); | |
521 | return ret; | |
522 | } | |
523 | total_size = bdrv_getlength(bs1) >> BDRV_SECTOR_BITS; | |
524 | ||
525 | if (bs1->drv && bs1->drv->protocol_name) | |
526 | is_protocol = 1; | |
527 | ||
528 | bdrv_delete(bs1); | |
529 | ||
530 | get_tmp_filename(tmp_filename, sizeof(tmp_filename)); | |
531 | ||
532 | /* Real path is meaningless for protocols */ | |
533 | if (is_protocol) | |
534 | snprintf(backing_filename, sizeof(backing_filename), | |
535 | "%s", filename); | |
536 | else if (!realpath(filename, backing_filename)) | |
537 | return -errno; | |
538 | ||
539 | bdrv_qcow2 = bdrv_find_format("qcow2"); | |
540 | options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); | |
541 | ||
542 | set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size * 512); | |
543 | set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); | |
544 | if (drv) { | |
545 | set_option_parameter(options, BLOCK_OPT_BACKING_FMT, | |
546 | drv->format_name); | |
547 | } | |
548 | ||
549 | ret = bdrv_create(bdrv_qcow2, tmp_filename, options); | |
550 | free_option_parameters(options); | |
551 | if (ret < 0) { | |
552 | return ret; | |
553 | } | |
554 | ||
555 | filename = tmp_filename; | |
556 | drv = bdrv_qcow2; | |
557 | bs->is_temporary = 1; | |
558 | } | |
559 | ||
560 | /* Find the right image format driver */ | |
561 | if (!drv) { | |
562 | drv = find_image_format(filename); | |
563 | } | |
564 | ||
565 | if (!drv) { | |
566 | ret = -ENOENT; | |
567 | goto unlink_and_fail; | |
568 | } | |
569 | ||
570 | /* Open the image */ | |
571 | ret = bdrv_open_common(bs, filename, flags, drv); | |
572 | if (ret < 0) { | |
573 | goto unlink_and_fail; | |
574 | } | |
575 | ||
576 | /* If there is a backing file, use it */ | |
577 | if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') { | |
578 | char backing_filename[PATH_MAX]; | |
579 | int back_flags; | |
580 | BlockDriver *back_drv = NULL; | |
581 | ||
582 | bs->backing_hd = bdrv_new(""); | |
583 | path_combine(backing_filename, sizeof(backing_filename), | |
584 | filename, bs->backing_file); | |
585 | if (bs->backing_format[0] != '\0') | |
586 | back_drv = bdrv_find_format(bs->backing_format); | |
587 | ||
588 | /* backing files always opened read-only */ | |
589 | back_flags = | |
590 | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
591 | ||
592 | ret = bdrv_open(bs->backing_hd, backing_filename, back_flags, back_drv); | |
593 | if (ret < 0) { | |
594 | bdrv_close(bs); | |
595 | return ret; | |
596 | } | |
597 | if (bs->is_temporary) { | |
598 | bs->backing_hd->keep_read_only = !(flags & BDRV_O_RDWR); | |
599 | } else { | |
600 | /* base image inherits from "parent" */ | |
601 | bs->backing_hd->keep_read_only = bs->keep_read_only; | |
602 | } | |
603 | } | |
604 | ||
605 | if (!bdrv_key_required(bs)) { | |
606 | /* call the change callback */ | |
607 | bs->media_changed = 1; | |
608 | if (bs->change_cb) | |
609 | bs->change_cb(bs->change_opaque); | |
610 | } | |
611 | ||
612 | return 0; | |
613 | ||
614 | unlink_and_fail: | |
615 | if (bs->is_temporary) { | |
616 | unlink(filename); | |
617 | } | |
618 | return ret; | |
619 | } | |
620 | ||
621 | void bdrv_close(BlockDriverState *bs) | |
622 | { | |
623 | if (bs->drv) { | |
624 | if (bs->backing_hd) { | |
625 | bdrv_delete(bs->backing_hd); | |
626 | bs->backing_hd = NULL; | |
627 | } | |
628 | bs->drv->bdrv_close(bs); | |
629 | qemu_free(bs->opaque); | |
630 | #ifdef _WIN32 | |
631 | if (bs->is_temporary) { | |
632 | unlink(bs->filename); | |
633 | } | |
634 | #endif | |
635 | bs->opaque = NULL; | |
636 | bs->drv = NULL; | |
637 | ||
638 | if (bs->file != NULL) { | |
639 | bdrv_close(bs->file); | |
640 | } | |
641 | ||
642 | /* call the change callback */ | |
643 | bs->media_changed = 1; | |
644 | if (bs->change_cb) | |
645 | bs->change_cb(bs->change_opaque); | |
646 | } | |
647 | } | |
648 | ||
649 | void bdrv_delete(BlockDriverState *bs) | |
650 | { | |
651 | /* remove from list, if necessary */ | |
652 | if (bs->device_name[0] != '\0') { | |
653 | QTAILQ_REMOVE(&bdrv_states, bs, list); | |
654 | } | |
655 | ||
656 | bdrv_close(bs); | |
657 | if (bs->file != NULL) { | |
658 | bdrv_delete(bs->file); | |
659 | } | |
660 | ||
661 | qemu_free(bs); | |
662 | } | |
663 | ||
664 | /* | |
665 | * Run consistency checks on an image | |
666 | * | |
667 | * Returns the number of errors or -errno when an internal error occurs | |
668 | */ | |
669 | int bdrv_check(BlockDriverState *bs) | |
670 | { | |
671 | if (bs->drv->bdrv_check == NULL) { | |
672 | return -ENOTSUP; | |
673 | } | |
674 | ||
675 | return bs->drv->bdrv_check(bs); | |
676 | } | |
677 | ||
678 | /* commit COW file into the raw image */ | |
679 | int bdrv_commit(BlockDriverState *bs) | |
680 | { | |
681 | BlockDriver *drv = bs->drv; | |
682 | int64_t i, total_sectors; | |
683 | int n, j, ro, open_flags; | |
684 | int ret = 0, rw_ret = 0; | |
685 | unsigned char sector[512]; | |
686 | char filename[1024]; | |
687 | BlockDriverState *bs_rw, *bs_ro; | |
688 | ||
689 | if (!drv) | |
690 | return -ENOMEDIUM; | |
691 | ||
692 | if (!bs->backing_hd) { | |
693 | return -ENOTSUP; | |
694 | } | |
695 | ||
696 | if (bs->backing_hd->keep_read_only) { | |
697 | return -EACCES; | |
698 | } | |
699 | ||
700 | ro = bs->backing_hd->read_only; | |
701 | strncpy(filename, bs->backing_hd->filename, sizeof(filename)); | |
702 | open_flags = bs->backing_hd->open_flags; | |
703 | ||
704 | if (ro) { | |
705 | /* re-open as RW */ | |
706 | bdrv_delete(bs->backing_hd); | |
707 | bs->backing_hd = NULL; | |
708 | bs_rw = bdrv_new(""); | |
709 | rw_ret = bdrv_open(bs_rw, filename, open_flags | BDRV_O_RDWR, drv); | |
710 | if (rw_ret < 0) { | |
711 | bdrv_delete(bs_rw); | |
712 | /* try to re-open read-only */ | |
713 | bs_ro = bdrv_new(""); | |
714 | ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, drv); | |
715 | if (ret < 0) { | |
716 | bdrv_delete(bs_ro); | |
717 | /* drive not functional anymore */ | |
718 | bs->drv = NULL; | |
719 | return ret; | |
720 | } | |
721 | bs->backing_hd = bs_ro; | |
722 | return rw_ret; | |
723 | } | |
724 | bs->backing_hd = bs_rw; | |
725 | } | |
726 | ||
727 | total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; | |
728 | for (i = 0; i < total_sectors;) { | |
729 | if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { | |
730 | for(j = 0; j < n; j++) { | |
731 | if (bdrv_read(bs, i, sector, 1) != 0) { | |
732 | ret = -EIO; | |
733 | goto ro_cleanup; | |
734 | } | |
735 | ||
736 | if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { | |
737 | ret = -EIO; | |
738 | goto ro_cleanup; | |
739 | } | |
740 | i++; | |
741 | } | |
742 | } else { | |
743 | i += n; | |
744 | } | |
745 | } | |
746 | ||
747 | if (drv->bdrv_make_empty) { | |
748 | ret = drv->bdrv_make_empty(bs); | |
749 | bdrv_flush(bs); | |
750 | } | |
751 | ||
752 | /* | |
753 | * Make sure all data we wrote to the backing device is actually | |
754 | * stable on disk. | |
755 | */ | |
756 | if (bs->backing_hd) | |
757 | bdrv_flush(bs->backing_hd); | |
758 | ||
759 | ro_cleanup: | |
760 | ||
761 | if (ro) { | |
762 | /* re-open as RO */ | |
763 | bdrv_delete(bs->backing_hd); | |
764 | bs->backing_hd = NULL; | |
765 | bs_ro = bdrv_new(""); | |
766 | ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, drv); | |
767 | if (ret < 0) { | |
768 | bdrv_delete(bs_ro); | |
769 | /* drive not functional anymore */ | |
770 | bs->drv = NULL; | |
771 | return ret; | |
772 | } | |
773 | bs->backing_hd = bs_ro; | |
774 | bs->backing_hd->keep_read_only = 0; | |
775 | } | |
776 | ||
777 | return ret; | |
778 | } | |
779 | ||
780 | /* | |
781 | * Return values: | |
782 | * 0 - success | |
783 | * -EINVAL - backing format specified, but no file | |
784 | * -ENOSPC - can't update the backing file because no space is left in the | |
785 | * image file header | |
786 | * -ENOTSUP - format driver doesn't support changing the backing file | |
787 | */ | |
788 | int bdrv_change_backing_file(BlockDriverState *bs, | |
789 | const char *backing_file, const char *backing_fmt) | |
790 | { | |
791 | BlockDriver *drv = bs->drv; | |
792 | ||
793 | if (drv->bdrv_change_backing_file != NULL) { | |
794 | return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); | |
795 | } else { | |
796 | return -ENOTSUP; | |
797 | } | |
798 | } | |
799 | ||
800 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, | |
801 | size_t size) | |
802 | { | |
803 | int64_t len; | |
804 | ||
805 | if (!bdrv_is_inserted(bs)) | |
806 | return -ENOMEDIUM; | |
807 | ||
808 | if (bs->growable) | |
809 | return 0; | |
810 | ||
811 | len = bdrv_getlength(bs); | |
812 | ||
813 | if (offset < 0) | |
814 | return -EIO; | |
815 | ||
816 | if ((offset > len) || (len - offset < size)) | |
817 | return -EIO; | |
818 | ||
819 | return 0; | |
820 | } | |
821 | ||
822 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, | |
823 | int nb_sectors) | |
824 | { | |
825 | return bdrv_check_byte_request(bs, sector_num * 512, nb_sectors * 512); | |
826 | } | |
827 | ||
828 | /* return < 0 if error. See bdrv_write() for the return codes */ | |
829 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, | |
830 | uint8_t *buf, int nb_sectors) | |
831 | { | |
832 | BlockDriver *drv = bs->drv; | |
833 | ||
834 | if (!drv) | |
835 | return -ENOMEDIUM; | |
836 | if (bdrv_check_request(bs, sector_num, nb_sectors)) | |
837 | return -EIO; | |
838 | ||
839 | return drv->bdrv_read(bs, sector_num, buf, nb_sectors); | |
840 | } | |
841 | ||
842 | static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num, | |
843 | int nb_sectors, int dirty) | |
844 | { | |
845 | int64_t start, end; | |
846 | unsigned long val, idx, bit; | |
847 | ||
848 | start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; | |
849 | end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK; | |
850 | ||
851 | for (; start <= end; start++) { | |
852 | idx = start / (sizeof(unsigned long) * 8); | |
853 | bit = start % (sizeof(unsigned long) * 8); | |
854 | val = bs->dirty_bitmap[idx]; | |
855 | if (dirty) { | |
856 | if (!(val & (1 << bit))) { | |
857 | bs->dirty_count++; | |
858 | val |= 1 << bit; | |
859 | } | |
860 | } else { | |
861 | if (val & (1 << bit)) { | |
862 | bs->dirty_count--; | |
863 | val &= ~(1 << bit); | |
864 | } | |
865 | } | |
866 | bs->dirty_bitmap[idx] = val; | |
867 | } | |
868 | } | |
869 | ||
870 | /* Return < 0 if error. Important errors are: | |
871 | -EIO generic I/O error (may happen for all errors) | |
872 | -ENOMEDIUM No media inserted. | |
873 | -EINVAL Invalid sector number or nb_sectors | |
874 | -EACCES Trying to write a read-only device | |
875 | */ | |
876 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, | |
877 | const uint8_t *buf, int nb_sectors) | |
878 | { | |
879 | BlockDriver *drv = bs->drv; | |
880 | if (!bs->drv) | |
881 | return -ENOMEDIUM; | |
882 | if (bs->read_only) | |
883 | return -EACCES; | |
884 | if (bdrv_check_request(bs, sector_num, nb_sectors)) | |
885 | return -EIO; | |
886 | ||
887 | if (bs->dirty_bitmap) { | |
888 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); | |
889 | } | |
890 | ||
891 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { | |
892 | bs->wr_highest_sector = sector_num + nb_sectors - 1; | |
893 | } | |
894 | ||
895 | return drv->bdrv_write(bs, sector_num, buf, nb_sectors); | |
896 | } | |
897 | ||
898 | int bdrv_pread(BlockDriverState *bs, int64_t offset, | |
899 | void *buf, int count1) | |
900 | { | |
901 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; | |
902 | int len, nb_sectors, count; | |
903 | int64_t sector_num; | |
904 | int ret; | |
905 | ||
906 | count = count1; | |
907 | /* first read to align to sector start */ | |
908 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); | |
909 | if (len > count) | |
910 | len = count; | |
911 | sector_num = offset >> BDRV_SECTOR_BITS; | |
912 | if (len > 0) { | |
913 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) | |
914 | return ret; | |
915 | memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len); | |
916 | count -= len; | |
917 | if (count == 0) | |
918 | return count1; | |
919 | sector_num++; | |
920 | buf += len; | |
921 | } | |
922 | ||
923 | /* read the sectors "in place" */ | |
924 | nb_sectors = count >> BDRV_SECTOR_BITS; | |
925 | if (nb_sectors > 0) { | |
926 | if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0) | |
927 | return ret; | |
928 | sector_num += nb_sectors; | |
929 | len = nb_sectors << BDRV_SECTOR_BITS; | |
930 | buf += len; | |
931 | count -= len; | |
932 | } | |
933 | ||
934 | /* add data from the last sector */ | |
935 | if (count > 0) { | |
936 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) | |
937 | return ret; | |
938 | memcpy(buf, tmp_buf, count); | |
939 | } | |
940 | return count1; | |
941 | } | |
942 | ||
943 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, | |
944 | const void *buf, int count1) | |
945 | { | |
946 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; | |
947 | int len, nb_sectors, count; | |
948 | int64_t sector_num; | |
949 | int ret; | |
950 | ||
951 | count = count1; | |
952 | /* first write to align to sector start */ | |
953 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); | |
954 | if (len > count) | |
955 | len = count; | |
956 | sector_num = offset >> BDRV_SECTOR_BITS; | |
957 | if (len > 0) { | |
958 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) | |
959 | return ret; | |
960 | memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len); | |
961 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) | |
962 | return ret; | |
963 | count -= len; | |
964 | if (count == 0) | |
965 | return count1; | |
966 | sector_num++; | |
967 | buf += len; | |
968 | } | |
969 | ||
970 | /* write the sectors "in place" */ | |
971 | nb_sectors = count >> BDRV_SECTOR_BITS; | |
972 | if (nb_sectors > 0) { | |
973 | if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0) | |
974 | return ret; | |
975 | sector_num += nb_sectors; | |
976 | len = nb_sectors << BDRV_SECTOR_BITS; | |
977 | buf += len; | |
978 | count -= len; | |
979 | } | |
980 | ||
981 | /* add data from the last sector */ | |
982 | if (count > 0) { | |
983 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) | |
984 | return ret; | |
985 | memcpy(tmp_buf, buf, count); | |
986 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) | |
987 | return ret; | |
988 | } | |
989 | return count1; | |
990 | } | |
991 | ||
992 | /** | |
993 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
994 | */ | |
995 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
996 | { | |
997 | BlockDriver *drv = bs->drv; | |
998 | int ret; | |
999 | if (!drv) | |
1000 | return -ENOMEDIUM; | |
1001 | if (!drv->bdrv_truncate) | |
1002 | return -ENOTSUP; | |
1003 | if (bs->read_only) | |
1004 | return -EACCES; | |
1005 | ret = drv->bdrv_truncate(bs, offset); | |
1006 | if (ret == 0) { | |
1007 | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); | |
1008 | } | |
1009 | return ret; | |
1010 | } | |
1011 | ||
1012 | /** | |
1013 | * Length of a file in bytes. Return < 0 if error or unknown. | |
1014 | */ | |
1015 | int64_t bdrv_getlength(BlockDriverState *bs) | |
1016 | { | |
1017 | BlockDriver *drv = bs->drv; | |
1018 | if (!drv) | |
1019 | return -ENOMEDIUM; | |
1020 | ||
1021 | /* Fixed size devices use the total_sectors value for speed instead of | |
1022 | issuing a length query (like lseek) on each call. Also, legacy block | |
1023 | drivers don't provide a bdrv_getlength function and must use | |
1024 | total_sectors. */ | |
1025 | if (!bs->growable || !drv->bdrv_getlength) { | |
1026 | return bs->total_sectors * BDRV_SECTOR_SIZE; | |
1027 | } | |
1028 | return drv->bdrv_getlength(bs); | |
1029 | } | |
1030 | ||
1031 | /* return 0 as number of sectors if no device present or error */ | |
1032 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) | |
1033 | { | |
1034 | int64_t length; | |
1035 | length = bdrv_getlength(bs); | |
1036 | if (length < 0) | |
1037 | length = 0; | |
1038 | else | |
1039 | length = length >> BDRV_SECTOR_BITS; | |
1040 | *nb_sectors_ptr = length; | |
1041 | } | |
1042 | ||
1043 | struct partition { | |
1044 | uint8_t boot_ind; /* 0x80 - active */ | |
1045 | uint8_t head; /* starting head */ | |
1046 | uint8_t sector; /* starting sector */ | |
1047 | uint8_t cyl; /* starting cylinder */ | |
1048 | uint8_t sys_ind; /* What partition type */ | |
1049 | uint8_t end_head; /* end head */ | |
1050 | uint8_t end_sector; /* end sector */ | |
1051 | uint8_t end_cyl; /* end cylinder */ | |
1052 | uint32_t start_sect; /* starting sector counting from 0 */ | |
1053 | uint32_t nr_sects; /* nr of sectors in partition */ | |
1054 | } __attribute__((packed)); | |
1055 | ||
1056 | /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */ | |
1057 | static int guess_disk_lchs(BlockDriverState *bs, | |
1058 | int *pcylinders, int *pheads, int *psectors) | |
1059 | { | |
1060 | uint8_t buf[512]; | |
1061 | int ret, i, heads, sectors, cylinders; | |
1062 | struct partition *p; | |
1063 | uint32_t nr_sects; | |
1064 | uint64_t nb_sectors; | |
1065 | ||
1066 | bdrv_get_geometry(bs, &nb_sectors); | |
1067 | ||
1068 | ret = bdrv_read(bs, 0, buf, 1); | |
1069 | if (ret < 0) | |
1070 | return -1; | |
1071 | /* test msdos magic */ | |
1072 | if (buf[510] != 0x55 || buf[511] != 0xaa) | |
1073 | return -1; | |
1074 | for(i = 0; i < 4; i++) { | |
1075 | p = ((struct partition *)(buf + 0x1be)) + i; | |
1076 | nr_sects = le32_to_cpu(p->nr_sects); | |
1077 | if (nr_sects && p->end_head) { | |
1078 | /* We make the assumption that the partition terminates on | |
1079 | a cylinder boundary */ | |
1080 | heads = p->end_head + 1; | |
1081 | sectors = p->end_sector & 63; | |
1082 | if (sectors == 0) | |
1083 | continue; | |
1084 | cylinders = nb_sectors / (heads * sectors); | |
1085 | if (cylinders < 1 || cylinders > 16383) | |
1086 | continue; | |
1087 | *pheads = heads; | |
1088 | *psectors = sectors; | |
1089 | *pcylinders = cylinders; | |
1090 | #if 0 | |
1091 | printf("guessed geometry: LCHS=%d %d %d\n", | |
1092 | cylinders, heads, sectors); | |
1093 | #endif | |
1094 | return 0; | |
1095 | } | |
1096 | } | |
1097 | return -1; | |
1098 | } | |
1099 | ||
1100 | void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) | |
1101 | { | |
1102 | int translation, lba_detected = 0; | |
1103 | int cylinders, heads, secs; | |
1104 | uint64_t nb_sectors; | |
1105 | ||
1106 | /* if a geometry hint is available, use it */ | |
1107 | bdrv_get_geometry(bs, &nb_sectors); | |
1108 | bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); | |
1109 | translation = bdrv_get_translation_hint(bs); | |
1110 | if (cylinders != 0) { | |
1111 | *pcyls = cylinders; | |
1112 | *pheads = heads; | |
1113 | *psecs = secs; | |
1114 | } else { | |
1115 | if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { | |
1116 | if (heads > 16) { | |
1117 | /* if heads > 16, it means that a BIOS LBA | |
1118 | translation was active, so the default | |
1119 | hardware geometry is OK */ | |
1120 | lba_detected = 1; | |
1121 | goto default_geometry; | |
1122 | } else { | |
1123 | *pcyls = cylinders; | |
1124 | *pheads = heads; | |
1125 | *psecs = secs; | |
1126 | /* disable any translation to be in sync with | |
1127 | the logical geometry */ | |
1128 | if (translation == BIOS_ATA_TRANSLATION_AUTO) { | |
1129 | bdrv_set_translation_hint(bs, | |
1130 | BIOS_ATA_TRANSLATION_NONE); | |
1131 | } | |
1132 | } | |
1133 | } else { | |
1134 | default_geometry: | |
1135 | /* if no geometry, use a standard physical disk geometry */ | |
1136 | cylinders = nb_sectors / (16 * 63); | |
1137 | ||
1138 | if (cylinders > 16383) | |
1139 | cylinders = 16383; | |
1140 | else if (cylinders < 2) | |
1141 | cylinders = 2; | |
1142 | *pcyls = cylinders; | |
1143 | *pheads = 16; | |
1144 | *psecs = 63; | |
1145 | if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { | |
1146 | if ((*pcyls * *pheads) <= 131072) { | |
1147 | bdrv_set_translation_hint(bs, | |
1148 | BIOS_ATA_TRANSLATION_LARGE); | |
1149 | } else { | |
1150 | bdrv_set_translation_hint(bs, | |
1151 | BIOS_ATA_TRANSLATION_LBA); | |
1152 | } | |
1153 | } | |
1154 | } | |
1155 | bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); | |
1156 | } | |
1157 | } | |
1158 | ||
1159 | void bdrv_set_geometry_hint(BlockDriverState *bs, | |
1160 | int cyls, int heads, int secs) | |
1161 | { | |
1162 | bs->cyls = cyls; | |
1163 | bs->heads = heads; | |
1164 | bs->secs = secs; | |
1165 | } | |
1166 | ||
1167 | void bdrv_set_type_hint(BlockDriverState *bs, int type) | |
1168 | { | |
1169 | bs->type = type; | |
1170 | bs->removable = ((type == BDRV_TYPE_CDROM || | |
1171 | type == BDRV_TYPE_FLOPPY)); | |
1172 | } | |
1173 | ||
1174 | void bdrv_set_translation_hint(BlockDriverState *bs, int translation) | |
1175 | { | |
1176 | bs->translation = translation; | |
1177 | } | |
1178 | ||
1179 | void bdrv_get_geometry_hint(BlockDriverState *bs, | |
1180 | int *pcyls, int *pheads, int *psecs) | |
1181 | { | |
1182 | *pcyls = bs->cyls; | |
1183 | *pheads = bs->heads; | |
1184 | *psecs = bs->secs; | |
1185 | } | |
1186 | ||
1187 | int bdrv_get_type_hint(BlockDriverState *bs) | |
1188 | { | |
1189 | return bs->type; | |
1190 | } | |
1191 | ||
1192 | int bdrv_get_translation_hint(BlockDriverState *bs) | |
1193 | { | |
1194 | return bs->translation; | |
1195 | } | |
1196 | ||
1197 | int bdrv_is_removable(BlockDriverState *bs) | |
1198 | { | |
1199 | return bs->removable; | |
1200 | } | |
1201 | ||
1202 | int bdrv_is_read_only(BlockDriverState *bs) | |
1203 | { | |
1204 | return bs->read_only; | |
1205 | } | |
1206 | ||
1207 | int bdrv_is_sg(BlockDriverState *bs) | |
1208 | { | |
1209 | return bs->sg; | |
1210 | } | |
1211 | ||
1212 | int bdrv_enable_write_cache(BlockDriverState *bs) | |
1213 | { | |
1214 | return bs->enable_write_cache; | |
1215 | } | |
1216 | ||
1217 | /* XXX: no longer used */ | |
1218 | void bdrv_set_change_cb(BlockDriverState *bs, | |
1219 | void (*change_cb)(void *opaque), void *opaque) | |
1220 | { | |
1221 | bs->change_cb = change_cb; | |
1222 | bs->change_opaque = opaque; | |
1223 | } | |
1224 | ||
1225 | int bdrv_is_encrypted(BlockDriverState *bs) | |
1226 | { | |
1227 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
1228 | return 1; | |
1229 | return bs->encrypted; | |
1230 | } | |
1231 | ||
1232 | int bdrv_key_required(BlockDriverState *bs) | |
1233 | { | |
1234 | BlockDriverState *backing_hd = bs->backing_hd; | |
1235 | ||
1236 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) | |
1237 | return 1; | |
1238 | return (bs->encrypted && !bs->valid_key); | |
1239 | } | |
1240 | ||
1241 | int bdrv_set_key(BlockDriverState *bs, const char *key) | |
1242 | { | |
1243 | int ret; | |
1244 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
1245 | ret = bdrv_set_key(bs->backing_hd, key); | |
1246 | if (ret < 0) | |
1247 | return ret; | |
1248 | if (!bs->encrypted) | |
1249 | return 0; | |
1250 | } | |
1251 | if (!bs->encrypted) { | |
1252 | return -EINVAL; | |
1253 | } else if (!bs->drv || !bs->drv->bdrv_set_key) { | |
1254 | return -ENOMEDIUM; | |
1255 | } | |
1256 | ret = bs->drv->bdrv_set_key(bs, key); | |
1257 | if (ret < 0) { | |
1258 | bs->valid_key = 0; | |
1259 | } else if (!bs->valid_key) { | |
1260 | bs->valid_key = 1; | |
1261 | /* call the change callback now, we skipped it on open */ | |
1262 | bs->media_changed = 1; | |
1263 | if (bs->change_cb) | |
1264 | bs->change_cb(bs->change_opaque); | |
1265 | } | |
1266 | return ret; | |
1267 | } | |
1268 | ||
1269 | void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) | |
1270 | { | |
1271 | if (!bs->drv) { | |
1272 | buf[0] = '\0'; | |
1273 | } else { | |
1274 | pstrcpy(buf, buf_size, bs->drv->format_name); | |
1275 | } | |
1276 | } | |
1277 | ||
1278 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), | |
1279 | void *opaque) | |
1280 | { | |
1281 | BlockDriver *drv; | |
1282 | ||
1283 | QLIST_FOREACH(drv, &bdrv_drivers, list) { | |
1284 | it(opaque, drv->format_name); | |
1285 | } | |
1286 | } | |
1287 | ||
1288 | BlockDriverState *bdrv_find(const char *name) | |
1289 | { | |
1290 | BlockDriverState *bs; | |
1291 | ||
1292 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1293 | if (!strcmp(name, bs->device_name)) { | |
1294 | return bs; | |
1295 | } | |
1296 | } | |
1297 | return NULL; | |
1298 | } | |
1299 | ||
1300 | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) | |
1301 | { | |
1302 | BlockDriverState *bs; | |
1303 | ||
1304 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1305 | it(opaque, bs); | |
1306 | } | |
1307 | } | |
1308 | ||
1309 | const char *bdrv_get_device_name(BlockDriverState *bs) | |
1310 | { | |
1311 | return bs->device_name; | |
1312 | } | |
1313 | ||
1314 | void bdrv_flush(BlockDriverState *bs) | |
1315 | { | |
1316 | if (bs->open_flags & BDRV_O_NO_FLUSH) { | |
1317 | return; | |
1318 | } | |
1319 | ||
1320 | if (bs->drv && bs->drv->bdrv_flush) | |
1321 | bs->drv->bdrv_flush(bs); | |
1322 | } | |
1323 | ||
1324 | void bdrv_flush_all(void) | |
1325 | { | |
1326 | BlockDriverState *bs; | |
1327 | ||
1328 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1329 | if (bs->drv && !bdrv_is_read_only(bs) && | |
1330 | (!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) { | |
1331 | bdrv_flush(bs); | |
1332 | } | |
1333 | } | |
1334 | } | |
1335 | ||
1336 | int bdrv_has_zero_init(BlockDriverState *bs) | |
1337 | { | |
1338 | assert(bs->drv); | |
1339 | ||
1340 | if (bs->drv->no_zero_init) { | |
1341 | return 0; | |
1342 | } else if (bs->file) { | |
1343 | return bdrv_has_zero_init(bs->file); | |
1344 | } | |
1345 | ||
1346 | return 1; | |
1347 | } | |
1348 | ||
1349 | /* | |
1350 | * Returns true iff the specified sector is present in the disk image. Drivers | |
1351 | * not implementing the functionality are assumed to not support backing files, | |
1352 | * hence all their sectors are reported as allocated. | |
1353 | * | |
1354 | * 'pnum' is set to the number of sectors (including and immediately following | |
1355 | * the specified sector) that are known to be in the same | |
1356 | * allocated/unallocated state. | |
1357 | * | |
1358 | * 'nb_sectors' is the max value 'pnum' should be set to. | |
1359 | */ | |
1360 | int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, | |
1361 | int *pnum) | |
1362 | { | |
1363 | int64_t n; | |
1364 | if (!bs->drv->bdrv_is_allocated) { | |
1365 | if (sector_num >= bs->total_sectors) { | |
1366 | *pnum = 0; | |
1367 | return 0; | |
1368 | } | |
1369 | n = bs->total_sectors - sector_num; | |
1370 | *pnum = (n < nb_sectors) ? (n) : (nb_sectors); | |
1371 | return 1; | |
1372 | } | |
1373 | return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum); | |
1374 | } | |
1375 | ||
1376 | void bdrv_mon_event(const BlockDriverState *bdrv, | |
1377 | BlockMonEventAction action, int is_read) | |
1378 | { | |
1379 | QObject *data; | |
1380 | const char *action_str; | |
1381 | ||
1382 | switch (action) { | |
1383 | case BDRV_ACTION_REPORT: | |
1384 | action_str = "report"; | |
1385 | break; | |
1386 | case BDRV_ACTION_IGNORE: | |
1387 | action_str = "ignore"; | |
1388 | break; | |
1389 | case BDRV_ACTION_STOP: | |
1390 | action_str = "stop"; | |
1391 | break; | |
1392 | default: | |
1393 | abort(); | |
1394 | } | |
1395 | ||
1396 | data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }", | |
1397 | bdrv->device_name, | |
1398 | action_str, | |
1399 | is_read ? "read" : "write"); | |
1400 | monitor_protocol_event(QEVENT_BLOCK_IO_ERROR, data); | |
1401 | ||
1402 | qobject_decref(data); | |
1403 | } | |
1404 | ||
1405 | static void bdrv_print_dict(QObject *obj, void *opaque) | |
1406 | { | |
1407 | QDict *bs_dict; | |
1408 | Monitor *mon = opaque; | |
1409 | ||
1410 | bs_dict = qobject_to_qdict(obj); | |
1411 | ||
1412 | monitor_printf(mon, "%s: type=%s removable=%d", | |
1413 | qdict_get_str(bs_dict, "device"), | |
1414 | qdict_get_str(bs_dict, "type"), | |
1415 | qdict_get_bool(bs_dict, "removable")); | |
1416 | ||
1417 | if (qdict_get_bool(bs_dict, "removable")) { | |
1418 | monitor_printf(mon, " locked=%d", qdict_get_bool(bs_dict, "locked")); | |
1419 | } | |
1420 | ||
1421 | if (qdict_haskey(bs_dict, "inserted")) { | |
1422 | QDict *qdict = qobject_to_qdict(qdict_get(bs_dict, "inserted")); | |
1423 | ||
1424 | monitor_printf(mon, " file="); | |
1425 | monitor_print_filename(mon, qdict_get_str(qdict, "file")); | |
1426 | if (qdict_haskey(qdict, "backing_file")) { | |
1427 | monitor_printf(mon, " backing_file="); | |
1428 | monitor_print_filename(mon, qdict_get_str(qdict, "backing_file")); | |
1429 | } | |
1430 | monitor_printf(mon, " ro=%d drv=%s encrypted=%d", | |
1431 | qdict_get_bool(qdict, "ro"), | |
1432 | qdict_get_str(qdict, "drv"), | |
1433 | qdict_get_bool(qdict, "encrypted")); | |
1434 | } else { | |
1435 | monitor_printf(mon, " [not inserted]"); | |
1436 | } | |
1437 | ||
1438 | monitor_printf(mon, "\n"); | |
1439 | } | |
1440 | ||
1441 | void bdrv_info_print(Monitor *mon, const QObject *data) | |
1442 | { | |
1443 | qlist_iter(qobject_to_qlist(data), bdrv_print_dict, mon); | |
1444 | } | |
1445 | ||
1446 | /** | |
1447 | * bdrv_info(): Block devices information | |
1448 | * | |
1449 | * Each block device information is stored in a QDict and the | |
1450 | * returned QObject is a QList of all devices. | |
1451 | * | |
1452 | * The QDict contains the following: | |
1453 | * | |
1454 | * - "device": device name | |
1455 | * - "type": device type | |
1456 | * - "removable": true if the device is removable, false otherwise | |
1457 | * - "locked": true if the device is locked, false otherwise | |
1458 | * - "inserted": only present if the device is inserted, it is a QDict | |
1459 | * containing the following: | |
1460 | * - "file": device file name | |
1461 | * - "ro": true if read-only, false otherwise | |
1462 | * - "drv": driver format name | |
1463 | * - "backing_file": backing file name if one is used | |
1464 | * - "encrypted": true if encrypted, false otherwise | |
1465 | * | |
1466 | * Example: | |
1467 | * | |
1468 | * [ { "device": "ide0-hd0", "type": "hd", "removable": false, "locked": false, | |
1469 | * "inserted": { "file": "/tmp/foobar", "ro": false, "drv": "qcow2" } }, | |
1470 | * { "device": "floppy0", "type": "floppy", "removable": true, | |
1471 | * "locked": false } ] | |
1472 | */ | |
1473 | void bdrv_info(Monitor *mon, QObject **ret_data) | |
1474 | { | |
1475 | QList *bs_list; | |
1476 | BlockDriverState *bs; | |
1477 | ||
1478 | bs_list = qlist_new(); | |
1479 | ||
1480 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1481 | QObject *bs_obj; | |
1482 | const char *type = "unknown"; | |
1483 | ||
1484 | switch(bs->type) { | |
1485 | case BDRV_TYPE_HD: | |
1486 | type = "hd"; | |
1487 | break; | |
1488 | case BDRV_TYPE_CDROM: | |
1489 | type = "cdrom"; | |
1490 | break; | |
1491 | case BDRV_TYPE_FLOPPY: | |
1492 | type = "floppy"; | |
1493 | break; | |
1494 | } | |
1495 | ||
1496 | bs_obj = qobject_from_jsonf("{ 'device': %s, 'type': %s, " | |
1497 | "'removable': %i, 'locked': %i }", | |
1498 | bs->device_name, type, bs->removable, | |
1499 | bs->locked); | |
1500 | ||
1501 | if (bs->drv) { | |
1502 | QObject *obj; | |
1503 | QDict *bs_dict = qobject_to_qdict(bs_obj); | |
1504 | ||
1505 | obj = qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, " | |
1506 | "'encrypted': %i }", | |
1507 | bs->filename, bs->read_only, | |
1508 | bs->drv->format_name, | |
1509 | bdrv_is_encrypted(bs)); | |
1510 | if (bs->backing_file[0] != '\0') { | |
1511 | QDict *qdict = qobject_to_qdict(obj); | |
1512 | qdict_put(qdict, "backing_file", | |
1513 | qstring_from_str(bs->backing_file)); | |
1514 | } | |
1515 | ||
1516 | qdict_put_obj(bs_dict, "inserted", obj); | |
1517 | } | |
1518 | qlist_append_obj(bs_list, bs_obj); | |
1519 | } | |
1520 | ||
1521 | *ret_data = QOBJECT(bs_list); | |
1522 | } | |
1523 | ||
1524 | static void bdrv_stats_iter(QObject *data, void *opaque) | |
1525 | { | |
1526 | QDict *qdict; | |
1527 | Monitor *mon = opaque; | |
1528 | ||
1529 | qdict = qobject_to_qdict(data); | |
1530 | monitor_printf(mon, "%s:", qdict_get_str(qdict, "device")); | |
1531 | ||
1532 | qdict = qobject_to_qdict(qdict_get(qdict, "stats")); | |
1533 | monitor_printf(mon, " rd_bytes=%" PRId64 | |
1534 | " wr_bytes=%" PRId64 | |
1535 | " rd_operations=%" PRId64 | |
1536 | " wr_operations=%" PRId64 | |
1537 | "\n", | |
1538 | qdict_get_int(qdict, "rd_bytes"), | |
1539 | qdict_get_int(qdict, "wr_bytes"), | |
1540 | qdict_get_int(qdict, "rd_operations"), | |
1541 | qdict_get_int(qdict, "wr_operations")); | |
1542 | } | |
1543 | ||
1544 | void bdrv_stats_print(Monitor *mon, const QObject *data) | |
1545 | { | |
1546 | qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon); | |
1547 | } | |
1548 | ||
1549 | static QObject* bdrv_info_stats_bs(BlockDriverState *bs) | |
1550 | { | |
1551 | QObject *res; | |
1552 | QDict *dict; | |
1553 | ||
1554 | res = qobject_from_jsonf("{ 'stats': {" | |
1555 | "'rd_bytes': %" PRId64 "," | |
1556 | "'wr_bytes': %" PRId64 "," | |
1557 | "'rd_operations': %" PRId64 "," | |
1558 | "'wr_operations': %" PRId64 "," | |
1559 | "'wr_highest_offset': %" PRId64 | |
1560 | "} }", | |
1561 | bs->rd_bytes, bs->wr_bytes, | |
1562 | bs->rd_ops, bs->wr_ops, | |
1563 | bs->wr_highest_sector * 512); | |
1564 | dict = qobject_to_qdict(res); | |
1565 | ||
1566 | if (*bs->device_name) { | |
1567 | qdict_put(dict, "device", qstring_from_str(bs->device_name)); | |
1568 | } | |
1569 | ||
1570 | if (bs->file) { | |
1571 | QObject *parent = bdrv_info_stats_bs(bs->file); | |
1572 | qdict_put_obj(dict, "parent", parent); | |
1573 | } | |
1574 | ||
1575 | return res; | |
1576 | } | |
1577 | ||
1578 | /** | |
1579 | * bdrv_info_stats(): show block device statistics | |
1580 | * | |
1581 | * Each device statistic information is stored in a QDict and | |
1582 | * the returned QObject is a QList of all devices. | |
1583 | * | |
1584 | * The QDict contains the following: | |
1585 | * | |
1586 | * - "device": device name | |
1587 | * - "stats": A QDict with the statistics information, it contains: | |
1588 | * - "rd_bytes": bytes read | |
1589 | * - "wr_bytes": bytes written | |
1590 | * - "rd_operations": read operations | |
1591 | * - "wr_operations": write operations | |
1592 | * - "wr_highest_offset": Highest offset of a sector written since the | |
1593 | * BlockDriverState has been opened | |
1594 | * - "parent": A QDict recursively holding the statistics of the underlying | |
1595 | * protocol (e.g. the host file for a qcow2 image). If there is no | |
1596 | * underlying protocol, this field is omitted. | |
1597 | * | |
1598 | * Example: | |
1599 | * | |
1600 | * [ { "device": "ide0-hd0", | |
1601 | * "stats": { "rd_bytes": 512, | |
1602 | * "wr_bytes": 0, | |
1603 | * "rd_operations": 1, | |
1604 | * "wr_operations": 0, | |
1605 | * "wr_highest_offset": 0 }, | |
1606 | * "parent": { | |
1607 | * "stats": { "rd_bytes": 1024, | |
1608 | * "wr_bytes": 0, | |
1609 | * "rd_operations": 2, | |
1610 | * "wr_operations": 0, | |
1611 | * "wr_highest_offset": 0, | |
1612 | * } } }, | |
1613 | * { "device": "ide1-cd0", | |
1614 | * "stats": { "rd_bytes": 0, | |
1615 | * "wr_bytes": 0, | |
1616 | * "rd_operations": 0, | |
1617 | * "wr_operations": 0, | |
1618 | * "wr_highest_offset": 0 } }, | |
1619 | */ | |
1620 | void bdrv_info_stats(Monitor *mon, QObject **ret_data) | |
1621 | { | |
1622 | QObject *obj; | |
1623 | QList *devices; | |
1624 | BlockDriverState *bs; | |
1625 | ||
1626 | devices = qlist_new(); | |
1627 | ||
1628 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1629 | obj = bdrv_info_stats_bs(bs); | |
1630 | qlist_append_obj(devices, obj); | |
1631 | } | |
1632 | ||
1633 | *ret_data = QOBJECT(devices); | |
1634 | } | |
1635 | ||
1636 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) | |
1637 | { | |
1638 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
1639 | return bs->backing_file; | |
1640 | else if (bs->encrypted) | |
1641 | return bs->filename; | |
1642 | else | |
1643 | return NULL; | |
1644 | } | |
1645 | ||
1646 | void bdrv_get_backing_filename(BlockDriverState *bs, | |
1647 | char *filename, int filename_size) | |
1648 | { | |
1649 | if (!bs->backing_file) { | |
1650 | pstrcpy(filename, filename_size, ""); | |
1651 | } else { | |
1652 | pstrcpy(filename, filename_size, bs->backing_file); | |
1653 | } | |
1654 | } | |
1655 | ||
1656 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, | |
1657 | const uint8_t *buf, int nb_sectors) | |
1658 | { | |
1659 | BlockDriver *drv = bs->drv; | |
1660 | if (!drv) | |
1661 | return -ENOMEDIUM; | |
1662 | if (!drv->bdrv_write_compressed) | |
1663 | return -ENOTSUP; | |
1664 | if (bdrv_check_request(bs, sector_num, nb_sectors)) | |
1665 | return -EIO; | |
1666 | ||
1667 | if (bs->dirty_bitmap) { | |
1668 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); | |
1669 | } | |
1670 | ||
1671 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); | |
1672 | } | |
1673 | ||
1674 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) | |
1675 | { | |
1676 | BlockDriver *drv = bs->drv; | |
1677 | if (!drv) | |
1678 | return -ENOMEDIUM; | |
1679 | if (!drv->bdrv_get_info) | |
1680 | return -ENOTSUP; | |
1681 | memset(bdi, 0, sizeof(*bdi)); | |
1682 | return drv->bdrv_get_info(bs, bdi); | |
1683 | } | |
1684 | ||
1685 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, | |
1686 | int64_t pos, int size) | |
1687 | { | |
1688 | BlockDriver *drv = bs->drv; | |
1689 | if (!drv) | |
1690 | return -ENOMEDIUM; | |
1691 | if (!drv->bdrv_save_vmstate) | |
1692 | return -ENOTSUP; | |
1693 | return drv->bdrv_save_vmstate(bs, buf, pos, size); | |
1694 | } | |
1695 | ||
1696 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, | |
1697 | int64_t pos, int size) | |
1698 | { | |
1699 | BlockDriver *drv = bs->drv; | |
1700 | if (!drv) | |
1701 | return -ENOMEDIUM; | |
1702 | if (!drv->bdrv_load_vmstate) | |
1703 | return -ENOTSUP; | |
1704 | return drv->bdrv_load_vmstate(bs, buf, pos, size); | |
1705 | } | |
1706 | ||
1707 | void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event) | |
1708 | { | |
1709 | BlockDriver *drv = bs->drv; | |
1710 | ||
1711 | if (!drv || !drv->bdrv_debug_event) { | |
1712 | return; | |
1713 | } | |
1714 | ||
1715 | return drv->bdrv_debug_event(bs, event); | |
1716 | ||
1717 | } | |
1718 | ||
1719 | /**************************************************************/ | |
1720 | /* handling of snapshots */ | |
1721 | ||
1722 | int bdrv_snapshot_create(BlockDriverState *bs, | |
1723 | QEMUSnapshotInfo *sn_info) | |
1724 | { | |
1725 | BlockDriver *drv = bs->drv; | |
1726 | if (!drv) | |
1727 | return -ENOMEDIUM; | |
1728 | if (!drv->bdrv_snapshot_create) | |
1729 | return -ENOTSUP; | |
1730 | return drv->bdrv_snapshot_create(bs, sn_info); | |
1731 | } | |
1732 | ||
1733 | int bdrv_snapshot_goto(BlockDriverState *bs, | |
1734 | const char *snapshot_id) | |
1735 | { | |
1736 | BlockDriver *drv = bs->drv; | |
1737 | if (!drv) | |
1738 | return -ENOMEDIUM; | |
1739 | if (!drv->bdrv_snapshot_goto) | |
1740 | return -ENOTSUP; | |
1741 | return drv->bdrv_snapshot_goto(bs, snapshot_id); | |
1742 | } | |
1743 | ||
1744 | int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) | |
1745 | { | |
1746 | BlockDriver *drv = bs->drv; | |
1747 | if (!drv) | |
1748 | return -ENOMEDIUM; | |
1749 | if (!drv->bdrv_snapshot_delete) | |
1750 | return -ENOTSUP; | |
1751 | return drv->bdrv_snapshot_delete(bs, snapshot_id); | |
1752 | } | |
1753 | ||
1754 | int bdrv_snapshot_list(BlockDriverState *bs, | |
1755 | QEMUSnapshotInfo **psn_info) | |
1756 | { | |
1757 | BlockDriver *drv = bs->drv; | |
1758 | if (!drv) | |
1759 | return -ENOMEDIUM; | |
1760 | if (!drv->bdrv_snapshot_list) | |
1761 | return -ENOTSUP; | |
1762 | return drv->bdrv_snapshot_list(bs, psn_info); | |
1763 | } | |
1764 | ||
1765 | #define NB_SUFFIXES 4 | |
1766 | ||
1767 | char *get_human_readable_size(char *buf, int buf_size, int64_t size) | |
1768 | { | |
1769 | static const char suffixes[NB_SUFFIXES] = "KMGT"; | |
1770 | int64_t base; | |
1771 | int i; | |
1772 | ||
1773 | if (size <= 999) { | |
1774 | snprintf(buf, buf_size, "%" PRId64, size); | |
1775 | } else { | |
1776 | base = 1024; | |
1777 | for(i = 0; i < NB_SUFFIXES; i++) { | |
1778 | if (size < (10 * base)) { | |
1779 | snprintf(buf, buf_size, "%0.1f%c", | |
1780 | (double)size / base, | |
1781 | suffixes[i]); | |
1782 | break; | |
1783 | } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { | |
1784 | snprintf(buf, buf_size, "%" PRId64 "%c", | |
1785 | ((size + (base >> 1)) / base), | |
1786 | suffixes[i]); | |
1787 | break; | |
1788 | } | |
1789 | base = base * 1024; | |
1790 | } | |
1791 | } | |
1792 | return buf; | |
1793 | } | |
1794 | ||
1795 | char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) | |
1796 | { | |
1797 | char buf1[128], date_buf[128], clock_buf[128]; | |
1798 | #ifdef _WIN32 | |
1799 | struct tm *ptm; | |
1800 | #else | |
1801 | struct tm tm; | |
1802 | #endif | |
1803 | time_t ti; | |
1804 | int64_t secs; | |
1805 | ||
1806 | if (!sn) { | |
1807 | snprintf(buf, buf_size, | |
1808 | "%-10s%-20s%7s%20s%15s", | |
1809 | "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); | |
1810 | } else { | |
1811 | ti = sn->date_sec; | |
1812 | #ifdef _WIN32 | |
1813 | ptm = localtime(&ti); | |
1814 | strftime(date_buf, sizeof(date_buf), | |
1815 | "%Y-%m-%d %H:%M:%S", ptm); | |
1816 | #else | |
1817 | localtime_r(&ti, &tm); | |
1818 | strftime(date_buf, sizeof(date_buf), | |
1819 | "%Y-%m-%d %H:%M:%S", &tm); | |
1820 | #endif | |
1821 | secs = sn->vm_clock_nsec / 1000000000; | |
1822 | snprintf(clock_buf, sizeof(clock_buf), | |
1823 | "%02d:%02d:%02d.%03d", | |
1824 | (int)(secs / 3600), | |
1825 | (int)((secs / 60) % 60), | |
1826 | (int)(secs % 60), | |
1827 | (int)((sn->vm_clock_nsec / 1000000) % 1000)); | |
1828 | snprintf(buf, buf_size, | |
1829 | "%-10s%-20s%7s%20s%15s", | |
1830 | sn->id_str, sn->name, | |
1831 | get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), | |
1832 | date_buf, | |
1833 | clock_buf); | |
1834 | } | |
1835 | return buf; | |
1836 | } | |
1837 | ||
1838 | ||
1839 | /**************************************************************/ | |
1840 | /* async I/Os */ | |
1841 | ||
1842 | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, | |
1843 | QEMUIOVector *qiov, int nb_sectors, | |
1844 | BlockDriverCompletionFunc *cb, void *opaque) | |
1845 | { | |
1846 | BlockDriver *drv = bs->drv; | |
1847 | BlockDriverAIOCB *ret; | |
1848 | ||
1849 | if (!drv) | |
1850 | return NULL; | |
1851 | if (bdrv_check_request(bs, sector_num, nb_sectors)) | |
1852 | return NULL; | |
1853 | ||
1854 | ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors, | |
1855 | cb, opaque); | |
1856 | ||
1857 | if (ret) { | |
1858 | /* Update stats even though technically transfer has not happened. */ | |
1859 | bs->rd_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE; | |
1860 | bs->rd_ops ++; | |
1861 | } | |
1862 | ||
1863 | return ret; | |
1864 | } | |
1865 | ||
1866 | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, | |
1867 | QEMUIOVector *qiov, int nb_sectors, | |
1868 | BlockDriverCompletionFunc *cb, void *opaque) | |
1869 | { | |
1870 | BlockDriver *drv = bs->drv; | |
1871 | BlockDriverAIOCB *ret; | |
1872 | ||
1873 | if (!drv) | |
1874 | return NULL; | |
1875 | if (bs->read_only) | |
1876 | return NULL; | |
1877 | if (bdrv_check_request(bs, sector_num, nb_sectors)) | |
1878 | return NULL; | |
1879 | ||
1880 | if (bs->dirty_bitmap) { | |
1881 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); | |
1882 | } | |
1883 | ||
1884 | ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors, | |
1885 | cb, opaque); | |
1886 | ||
1887 | if (ret) { | |
1888 | /* Update stats even though technically transfer has not happened. */ | |
1889 | bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE; | |
1890 | bs->wr_ops ++; | |
1891 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { | |
1892 | bs->wr_highest_sector = sector_num + nb_sectors - 1; | |
1893 | } | |
1894 | } | |
1895 | ||
1896 | return ret; | |
1897 | } | |
1898 | ||
1899 | ||
1900 | typedef struct MultiwriteCB { | |
1901 | int error; | |
1902 | int num_requests; | |
1903 | int num_callbacks; | |
1904 | struct { | |
1905 | BlockDriverCompletionFunc *cb; | |
1906 | void *opaque; | |
1907 | QEMUIOVector *free_qiov; | |
1908 | void *free_buf; | |
1909 | } callbacks[]; | |
1910 | } MultiwriteCB; | |
1911 | ||
1912 | static void multiwrite_user_cb(MultiwriteCB *mcb) | |
1913 | { | |
1914 | int i; | |
1915 | ||
1916 | for (i = 0; i < mcb->num_callbacks; i++) { | |
1917 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); | |
1918 | if (mcb->callbacks[i].free_qiov) { | |
1919 | qemu_iovec_destroy(mcb->callbacks[i].free_qiov); | |
1920 | } | |
1921 | qemu_free(mcb->callbacks[i].free_qiov); | |
1922 | qemu_vfree(mcb->callbacks[i].free_buf); | |
1923 | } | |
1924 | } | |
1925 | ||
1926 | static void multiwrite_cb(void *opaque, int ret) | |
1927 | { | |
1928 | MultiwriteCB *mcb = opaque; | |
1929 | ||
1930 | if (ret < 0 && !mcb->error) { | |
1931 | mcb->error = ret; | |
1932 | multiwrite_user_cb(mcb); | |
1933 | } | |
1934 | ||
1935 | mcb->num_requests--; | |
1936 | if (mcb->num_requests == 0) { | |
1937 | if (mcb->error == 0) { | |
1938 | multiwrite_user_cb(mcb); | |
1939 | } | |
1940 | qemu_free(mcb); | |
1941 | } | |
1942 | } | |
1943 | ||
1944 | static int multiwrite_req_compare(const void *a, const void *b) | |
1945 | { | |
1946 | const BlockRequest *req1 = a, *req2 = b; | |
1947 | ||
1948 | /* | |
1949 | * Note that we can't simply subtract req2->sector from req1->sector | |
1950 | * here as that could overflow the return value. | |
1951 | */ | |
1952 | if (req1->sector > req2->sector) { | |
1953 | return 1; | |
1954 | } else if (req1->sector < req2->sector) { | |
1955 | return -1; | |
1956 | } else { | |
1957 | return 0; | |
1958 | } | |
1959 | } | |
1960 | ||
1961 | /* | |
1962 | * Takes a bunch of requests and tries to merge them. Returns the number of | |
1963 | * requests that remain after merging. | |
1964 | */ | |
1965 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, | |
1966 | int num_reqs, MultiwriteCB *mcb) | |
1967 | { | |
1968 | int i, outidx; | |
1969 | ||
1970 | // Sort requests by start sector | |
1971 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); | |
1972 | ||
1973 | // Check if adjacent requests touch the same clusters. If so, combine them, | |
1974 | // filling up gaps with zero sectors. | |
1975 | outidx = 0; | |
1976 | for (i = 1; i < num_reqs; i++) { | |
1977 | int merge = 0; | |
1978 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; | |
1979 | ||
1980 | // This handles the cases that are valid for all block drivers, namely | |
1981 | // exactly sequential writes and overlapping writes. | |
1982 | if (reqs[i].sector <= oldreq_last) { | |
1983 | merge = 1; | |
1984 | } | |
1985 | ||
1986 | // The block driver may decide that it makes sense to combine requests | |
1987 | // even if there is a gap of some sectors between them. In this case, | |
1988 | // the gap is filled with zeros (therefore only applicable for yet | |
1989 | // unused space in format like qcow2). | |
1990 | if (!merge && bs->drv->bdrv_merge_requests) { | |
1991 | merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]); | |
1992 | } | |
1993 | ||
1994 | if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { | |
1995 | merge = 0; | |
1996 | } | |
1997 | ||
1998 | if (merge) { | |
1999 | size_t size; | |
2000 | QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov)); | |
2001 | qemu_iovec_init(qiov, | |
2002 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); | |
2003 | ||
2004 | // Add the first request to the merged one. If the requests are | |
2005 | // overlapping, drop the last sectors of the first request. | |
2006 | size = (reqs[i].sector - reqs[outidx].sector) << 9; | |
2007 | qemu_iovec_concat(qiov, reqs[outidx].qiov, size); | |
2008 | ||
2009 | // We might need to add some zeros between the two requests | |
2010 | if (reqs[i].sector > oldreq_last) { | |
2011 | size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9; | |
2012 | uint8_t *buf = qemu_blockalign(bs, zero_bytes); | |
2013 | memset(buf, 0, zero_bytes); | |
2014 | qemu_iovec_add(qiov, buf, zero_bytes); | |
2015 | mcb->callbacks[i].free_buf = buf; | |
2016 | } | |
2017 | ||
2018 | // Add the second request | |
2019 | qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size); | |
2020 | ||
2021 | reqs[outidx].nb_sectors = qiov->size >> 9; | |
2022 | reqs[outidx].qiov = qiov; | |
2023 | ||
2024 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; | |
2025 | } else { | |
2026 | outidx++; | |
2027 | reqs[outidx].sector = reqs[i].sector; | |
2028 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; | |
2029 | reqs[outidx].qiov = reqs[i].qiov; | |
2030 | } | |
2031 | } | |
2032 | ||
2033 | return outidx + 1; | |
2034 | } | |
2035 | ||
2036 | /* | |
2037 | * Submit multiple AIO write requests at once. | |
2038 | * | |
2039 | * On success, the function returns 0 and all requests in the reqs array have | |
2040 | * been submitted. In error case this function returns -1, and any of the | |
2041 | * requests may or may not be submitted yet. In particular, this means that the | |
2042 | * callback will be called for some of the requests, for others it won't. The | |
2043 | * caller must check the error field of the BlockRequest to wait for the right | |
2044 | * callbacks (if error != 0, no callback will be called). | |
2045 | * | |
2046 | * The implementation may modify the contents of the reqs array, e.g. to merge | |
2047 | * requests. However, the fields opaque and error are left unmodified as they | |
2048 | * are used to signal failure for a single request to the caller. | |
2049 | */ | |
2050 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) | |
2051 | { | |
2052 | BlockDriverAIOCB *acb; | |
2053 | MultiwriteCB *mcb; | |
2054 | int i; | |
2055 | ||
2056 | if (num_reqs == 0) { | |
2057 | return 0; | |
2058 | } | |
2059 | ||
2060 | // Create MultiwriteCB structure | |
2061 | mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); | |
2062 | mcb->num_requests = 0; | |
2063 | mcb->num_callbacks = num_reqs; | |
2064 | ||
2065 | for (i = 0; i < num_reqs; i++) { | |
2066 | mcb->callbacks[i].cb = reqs[i].cb; | |
2067 | mcb->callbacks[i].opaque = reqs[i].opaque; | |
2068 | } | |
2069 | ||
2070 | // Check for mergable requests | |
2071 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); | |
2072 | ||
2073 | // Run the aio requests | |
2074 | for (i = 0; i < num_reqs; i++) { | |
2075 | acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, | |
2076 | reqs[i].nb_sectors, multiwrite_cb, mcb); | |
2077 | ||
2078 | if (acb == NULL) { | |
2079 | // We can only fail the whole thing if no request has been | |
2080 | // submitted yet. Otherwise we'll wait for the submitted AIOs to | |
2081 | // complete and report the error in the callback. | |
2082 | if (mcb->num_requests == 0) { | |
2083 | reqs[i].error = -EIO; | |
2084 | goto fail; | |
2085 | } else { | |
2086 | mcb->num_requests++; | |
2087 | multiwrite_cb(mcb, -EIO); | |
2088 | break; | |
2089 | } | |
2090 | } else { | |
2091 | mcb->num_requests++; | |
2092 | } | |
2093 | } | |
2094 | ||
2095 | return 0; | |
2096 | ||
2097 | fail: | |
2098 | qemu_free(mcb); | |
2099 | return -1; | |
2100 | } | |
2101 | ||
2102 | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, | |
2103 | BlockDriverCompletionFunc *cb, void *opaque) | |
2104 | { | |
2105 | BlockDriver *drv = bs->drv; | |
2106 | ||
2107 | if (bs->open_flags & BDRV_O_NO_FLUSH) { | |
2108 | return bdrv_aio_noop_em(bs, cb, opaque); | |
2109 | } | |
2110 | ||
2111 | if (!drv) | |
2112 | return NULL; | |
2113 | return drv->bdrv_aio_flush(bs, cb, opaque); | |
2114 | } | |
2115 | ||
2116 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) | |
2117 | { | |
2118 | acb->pool->cancel(acb); | |
2119 | } | |
2120 | ||
2121 | ||
2122 | /**************************************************************/ | |
2123 | /* async block device emulation */ | |
2124 | ||
2125 | typedef struct BlockDriverAIOCBSync { | |
2126 | BlockDriverAIOCB common; | |
2127 | QEMUBH *bh; | |
2128 | int ret; | |
2129 | /* vector translation state */ | |
2130 | QEMUIOVector *qiov; | |
2131 | uint8_t *bounce; | |
2132 | int is_write; | |
2133 | } BlockDriverAIOCBSync; | |
2134 | ||
2135 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) | |
2136 | { | |
2137 | BlockDriverAIOCBSync *acb = | |
2138 | container_of(blockacb, BlockDriverAIOCBSync, common); | |
2139 | qemu_bh_delete(acb->bh); | |
2140 | acb->bh = NULL; | |
2141 | qemu_aio_release(acb); | |
2142 | } | |
2143 | ||
2144 | static AIOPool bdrv_em_aio_pool = { | |
2145 | .aiocb_size = sizeof(BlockDriverAIOCBSync), | |
2146 | .cancel = bdrv_aio_cancel_em, | |
2147 | }; | |
2148 | ||
2149 | static void bdrv_aio_bh_cb(void *opaque) | |
2150 | { | |
2151 | BlockDriverAIOCBSync *acb = opaque; | |
2152 | ||
2153 | if (!acb->is_write) | |
2154 | qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); | |
2155 | qemu_vfree(acb->bounce); | |
2156 | acb->common.cb(acb->common.opaque, acb->ret); | |
2157 | qemu_bh_delete(acb->bh); | |
2158 | acb->bh = NULL; | |
2159 | qemu_aio_release(acb); | |
2160 | } | |
2161 | ||
2162 | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, | |
2163 | int64_t sector_num, | |
2164 | QEMUIOVector *qiov, | |
2165 | int nb_sectors, | |
2166 | BlockDriverCompletionFunc *cb, | |
2167 | void *opaque, | |
2168 | int is_write) | |
2169 | ||
2170 | { | |
2171 | BlockDriverAIOCBSync *acb; | |
2172 | ||
2173 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); | |
2174 | acb->is_write = is_write; | |
2175 | acb->qiov = qiov; | |
2176 | acb->bounce = qemu_blockalign(bs, qiov->size); | |
2177 | ||
2178 | if (!acb->bh) | |
2179 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
2180 | ||
2181 | if (is_write) { | |
2182 | qemu_iovec_to_buffer(acb->qiov, acb->bounce); | |
2183 | acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors); | |
2184 | } else { | |
2185 | acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors); | |
2186 | } | |
2187 | ||
2188 | qemu_bh_schedule(acb->bh); | |
2189 | ||
2190 | return &acb->common; | |
2191 | } | |
2192 | ||
2193 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, | |
2194 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
2195 | BlockDriverCompletionFunc *cb, void *opaque) | |
2196 | { | |
2197 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); | |
2198 | } | |
2199 | ||
2200 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, | |
2201 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
2202 | BlockDriverCompletionFunc *cb, void *opaque) | |
2203 | { | |
2204 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); | |
2205 | } | |
2206 | ||
2207 | static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, | |
2208 | BlockDriverCompletionFunc *cb, void *opaque) | |
2209 | { | |
2210 | BlockDriverAIOCBSync *acb; | |
2211 | ||
2212 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); | |
2213 | acb->is_write = 1; /* don't bounce in the completion hadler */ | |
2214 | acb->qiov = NULL; | |
2215 | acb->bounce = NULL; | |
2216 | acb->ret = 0; | |
2217 | ||
2218 | if (!acb->bh) | |
2219 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
2220 | ||
2221 | bdrv_flush(bs); | |
2222 | qemu_bh_schedule(acb->bh); | |
2223 | return &acb->common; | |
2224 | } | |
2225 | ||
2226 | static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs, | |
2227 | BlockDriverCompletionFunc *cb, void *opaque) | |
2228 | { | |
2229 | BlockDriverAIOCBSync *acb; | |
2230 | ||
2231 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); | |
2232 | acb->is_write = 1; /* don't bounce in the completion handler */ | |
2233 | acb->qiov = NULL; | |
2234 | acb->bounce = NULL; | |
2235 | acb->ret = 0; | |
2236 | ||
2237 | if (!acb->bh) { | |
2238 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
2239 | } | |
2240 | ||
2241 | qemu_bh_schedule(acb->bh); | |
2242 | return &acb->common; | |
2243 | } | |
2244 | ||
2245 | /**************************************************************/ | |
2246 | /* sync block device emulation */ | |
2247 | ||
2248 | static void bdrv_rw_em_cb(void *opaque, int ret) | |
2249 | { | |
2250 | *(int *)opaque = ret; | |
2251 | } | |
2252 | ||
2253 | #define NOT_DONE 0x7fffffff | |
2254 | ||
2255 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, | |
2256 | uint8_t *buf, int nb_sectors) | |
2257 | { | |
2258 | int async_ret; | |
2259 | BlockDriverAIOCB *acb; | |
2260 | struct iovec iov; | |
2261 | QEMUIOVector qiov; | |
2262 | ||
2263 | async_context_push(); | |
2264 | ||
2265 | async_ret = NOT_DONE; | |
2266 | iov.iov_base = (void *)buf; | |
2267 | iov.iov_len = nb_sectors * 512; | |
2268 | qemu_iovec_init_external(&qiov, &iov, 1); | |
2269 | acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors, | |
2270 | bdrv_rw_em_cb, &async_ret); | |
2271 | if (acb == NULL) { | |
2272 | async_ret = -1; | |
2273 | goto fail; | |
2274 | } | |
2275 | ||
2276 | while (async_ret == NOT_DONE) { | |
2277 | qemu_aio_wait(); | |
2278 | } | |
2279 | ||
2280 | ||
2281 | fail: | |
2282 | async_context_pop(); | |
2283 | return async_ret; | |
2284 | } | |
2285 | ||
2286 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, | |
2287 | const uint8_t *buf, int nb_sectors) | |
2288 | { | |
2289 | int async_ret; | |
2290 | BlockDriverAIOCB *acb; | |
2291 | struct iovec iov; | |
2292 | QEMUIOVector qiov; | |
2293 | ||
2294 | async_context_push(); | |
2295 | ||
2296 | async_ret = NOT_DONE; | |
2297 | iov.iov_base = (void *)buf; | |
2298 | iov.iov_len = nb_sectors * 512; | |
2299 | qemu_iovec_init_external(&qiov, &iov, 1); | |
2300 | acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors, | |
2301 | bdrv_rw_em_cb, &async_ret); | |
2302 | if (acb == NULL) { | |
2303 | async_ret = -1; | |
2304 | goto fail; | |
2305 | } | |
2306 | while (async_ret == NOT_DONE) { | |
2307 | qemu_aio_wait(); | |
2308 | } | |
2309 | ||
2310 | fail: | |
2311 | async_context_pop(); | |
2312 | return async_ret; | |
2313 | } | |
2314 | ||
2315 | void bdrv_init(void) | |
2316 | { | |
2317 | module_call_init(MODULE_INIT_BLOCK); | |
2318 | } | |
2319 | ||
2320 | void bdrv_init_with_whitelist(void) | |
2321 | { | |
2322 | use_bdrv_whitelist = 1; | |
2323 | bdrv_init(); | |
2324 | } | |
2325 | ||
2326 | void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs, | |
2327 | BlockDriverCompletionFunc *cb, void *opaque) | |
2328 | { | |
2329 | BlockDriverAIOCB *acb; | |
2330 | ||
2331 | if (pool->free_aiocb) { | |
2332 | acb = pool->free_aiocb; | |
2333 | pool->free_aiocb = acb->next; | |
2334 | } else { | |
2335 | acb = qemu_mallocz(pool->aiocb_size); | |
2336 | acb->pool = pool; | |
2337 | } | |
2338 | acb->bs = bs; | |
2339 | acb->cb = cb; | |
2340 | acb->opaque = opaque; | |
2341 | return acb; | |
2342 | } | |
2343 | ||
2344 | void qemu_aio_release(void *p) | |
2345 | { | |
2346 | BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; | |
2347 | AIOPool *pool = acb->pool; | |
2348 | acb->next = pool->free_aiocb; | |
2349 | pool->free_aiocb = acb; | |
2350 | } | |
2351 | ||
2352 | /**************************************************************/ | |
2353 | /* removable device support */ | |
2354 | ||
2355 | /** | |
2356 | * Return TRUE if the media is present | |
2357 | */ | |
2358 | int bdrv_is_inserted(BlockDriverState *bs) | |
2359 | { | |
2360 | BlockDriver *drv = bs->drv; | |
2361 | int ret; | |
2362 | if (!drv) | |
2363 | return 0; | |
2364 | if (!drv->bdrv_is_inserted) | |
2365 | return 1; | |
2366 | ret = drv->bdrv_is_inserted(bs); | |
2367 | return ret; | |
2368 | } | |
2369 | ||
2370 | /** | |
2371 | * Return TRUE if the media changed since the last call to this | |
2372 | * function. It is currently only used for floppy disks | |
2373 | */ | |
2374 | int bdrv_media_changed(BlockDriverState *bs) | |
2375 | { | |
2376 | BlockDriver *drv = bs->drv; | |
2377 | int ret; | |
2378 | ||
2379 | if (!drv || !drv->bdrv_media_changed) | |
2380 | ret = -ENOTSUP; | |
2381 | else | |
2382 | ret = drv->bdrv_media_changed(bs); | |
2383 | if (ret == -ENOTSUP) | |
2384 | ret = bs->media_changed; | |
2385 | bs->media_changed = 0; | |
2386 | return ret; | |
2387 | } | |
2388 | ||
2389 | /** | |
2390 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
2391 | */ | |
2392 | int bdrv_eject(BlockDriverState *bs, int eject_flag) | |
2393 | { | |
2394 | BlockDriver *drv = bs->drv; | |
2395 | int ret; | |
2396 | ||
2397 | if (bs->locked) { | |
2398 | return -EBUSY; | |
2399 | } | |
2400 | ||
2401 | if (!drv || !drv->bdrv_eject) { | |
2402 | ret = -ENOTSUP; | |
2403 | } else { | |
2404 | ret = drv->bdrv_eject(bs, eject_flag); | |
2405 | } | |
2406 | if (ret == -ENOTSUP) { | |
2407 | if (eject_flag) | |
2408 | bdrv_close(bs); | |
2409 | ret = 0; | |
2410 | } | |
2411 | ||
2412 | return ret; | |
2413 | } | |
2414 | ||
2415 | int bdrv_is_locked(BlockDriverState *bs) | |
2416 | { | |
2417 | return bs->locked; | |
2418 | } | |
2419 | ||
2420 | /** | |
2421 | * Lock or unlock the media (if it is locked, the user won't be able | |
2422 | * to eject it manually). | |
2423 | */ | |
2424 | void bdrv_set_locked(BlockDriverState *bs, int locked) | |
2425 | { | |
2426 | BlockDriver *drv = bs->drv; | |
2427 | ||
2428 | bs->locked = locked; | |
2429 | if (drv && drv->bdrv_set_locked) { | |
2430 | drv->bdrv_set_locked(bs, locked); | |
2431 | } | |
2432 | } | |
2433 | ||
2434 | /* needed for generic scsi interface */ | |
2435 | ||
2436 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
2437 | { | |
2438 | BlockDriver *drv = bs->drv; | |
2439 | ||
2440 | if (drv && drv->bdrv_ioctl) | |
2441 | return drv->bdrv_ioctl(bs, req, buf); | |
2442 | return -ENOTSUP; | |
2443 | } | |
2444 | ||
2445 | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, | |
2446 | unsigned long int req, void *buf, | |
2447 | BlockDriverCompletionFunc *cb, void *opaque) | |
2448 | { | |
2449 | BlockDriver *drv = bs->drv; | |
2450 | ||
2451 | if (drv && drv->bdrv_aio_ioctl) | |
2452 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); | |
2453 | return NULL; | |
2454 | } | |
2455 | ||
2456 | ||
2457 | ||
2458 | void *qemu_blockalign(BlockDriverState *bs, size_t size) | |
2459 | { | |
2460 | return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); | |
2461 | } | |
2462 | ||
2463 | void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable) | |
2464 | { | |
2465 | int64_t bitmap_size; | |
2466 | ||
2467 | bs->dirty_count = 0; | |
2468 | if (enable) { | |
2469 | if (!bs->dirty_bitmap) { | |
2470 | bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) + | |
2471 | BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1; | |
2472 | bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8; | |
2473 | ||
2474 | bs->dirty_bitmap = qemu_mallocz(bitmap_size); | |
2475 | } | |
2476 | } else { | |
2477 | if (bs->dirty_bitmap) { | |
2478 | qemu_free(bs->dirty_bitmap); | |
2479 | bs->dirty_bitmap = NULL; | |
2480 | } | |
2481 | } | |
2482 | } | |
2483 | ||
2484 | int bdrv_get_dirty(BlockDriverState *bs, int64_t sector) | |
2485 | { | |
2486 | int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; | |
2487 | ||
2488 | if (bs->dirty_bitmap && | |
2489 | (sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) { | |
2490 | return bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] & | |
2491 | (1 << (chunk % (sizeof(unsigned long) * 8))); | |
2492 | } else { | |
2493 | return 0; | |
2494 | } | |
2495 | } | |
2496 | ||
2497 | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, | |
2498 | int nr_sectors) | |
2499 | { | |
2500 | set_dirty_bitmap(bs, cur_sector, nr_sectors, 0); | |
2501 | } | |
2502 | ||
2503 | int64_t bdrv_get_dirty_count(BlockDriverState *bs) | |
2504 | { | |
2505 | return bs->dirty_count; | |
2506 | } |