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