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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 "trace.h" | |
27 | #include "monitor.h" | |
28 | #include "block_int.h" | |
29 | #include "module.h" | |
30 | #include "qemu-objects.h" | |
31 | ||
32 | #ifdef CONFIG_BSD | |
33 | #include <sys/types.h> | |
34 | #include <sys/stat.h> | |
35 | #include <sys/ioctl.h> | |
36 | #include <sys/queue.h> | |
37 | #ifndef __DragonFly__ | |
38 | #include <sys/disk.h> | |
39 | #endif | |
40 | #endif | |
41 | ||
42 | #ifdef _WIN32 | |
43 | #include <windows.h> | |
44 | #endif | |
45 | ||
46 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, | |
47 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
48 | BlockDriverCompletionFunc *cb, void *opaque); | |
49 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, | |
50 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
51 | BlockDriverCompletionFunc *cb, void *opaque); | |
52 | static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, | |
53 | BlockDriverCompletionFunc *cb, void *opaque); | |
54 | static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs, | |
55 | BlockDriverCompletionFunc *cb, void *opaque); | |
56 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, | |
57 | uint8_t *buf, int nb_sectors); | |
58 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, | |
59 | const uint8_t *buf, int nb_sectors); | |
60 | ||
61 | static QTAILQ_HEAD(, BlockDriverState) bdrv_states = | |
62 | QTAILQ_HEAD_INITIALIZER(bdrv_states); | |
63 | ||
64 | static QLIST_HEAD(, BlockDriver) bdrv_drivers = | |
65 | QLIST_HEAD_INITIALIZER(bdrv_drivers); | |
66 | ||
67 | /* The device to use for VM snapshots */ | |
68 | static BlockDriverState *bs_snapshots; | |
69 | ||
70 | /* If non-zero, use only whitelisted block drivers */ | |
71 | static int use_bdrv_whitelist; | |
72 | ||
73 | #ifdef _WIN32 | |
74 | static int is_windows_drive_prefix(const char *filename) | |
75 | { | |
76 | return (((filename[0] >= 'a' && filename[0] <= 'z') || | |
77 | (filename[0] >= 'A' && filename[0] <= 'Z')) && | |
78 | filename[1] == ':'); | |
79 | } | |
80 | ||
81 | int is_windows_drive(const char *filename) | |
82 | { | |
83 | if (is_windows_drive_prefix(filename) && | |
84 | filename[2] == '\0') | |
85 | return 1; | |
86 | if (strstart(filename, "\\\\.\\", NULL) || | |
87 | strstart(filename, "//./", NULL)) | |
88 | return 1; | |
89 | return 0; | |
90 | } | |
91 | #endif | |
92 | ||
93 | /* check if the path starts with "<protocol>:" */ | |
94 | static int path_has_protocol(const char *path) | |
95 | { | |
96 | #ifdef _WIN32 | |
97 | if (is_windows_drive(path) || | |
98 | is_windows_drive_prefix(path)) { | |
99 | return 0; | |
100 | } | |
101 | #endif | |
102 | ||
103 | return strchr(path, ':') != NULL; | |
104 | } | |
105 | ||
106 | int path_is_absolute(const char *path) | |
107 | { | |
108 | const char *p; | |
109 | #ifdef _WIN32 | |
110 | /* specific case for names like: "\\.\d:" */ | |
111 | if (*path == '/' || *path == '\\') | |
112 | return 1; | |
113 | #endif | |
114 | p = strchr(path, ':'); | |
115 | if (p) | |
116 | p++; | |
117 | else | |
118 | p = path; | |
119 | #ifdef _WIN32 | |
120 | return (*p == '/' || *p == '\\'); | |
121 | #else | |
122 | return (*p == '/'); | |
123 | #endif | |
124 | } | |
125 | ||
126 | /* if filename is absolute, just copy it to dest. Otherwise, build a | |
127 | path to it by considering it is relative to base_path. URL are | |
128 | supported. */ | |
129 | void path_combine(char *dest, int dest_size, | |
130 | const char *base_path, | |
131 | const char *filename) | |
132 | { | |
133 | const char *p, *p1; | |
134 | int len; | |
135 | ||
136 | if (dest_size <= 0) | |
137 | return; | |
138 | if (path_is_absolute(filename)) { | |
139 | pstrcpy(dest, dest_size, filename); | |
140 | } else { | |
141 | p = strchr(base_path, ':'); | |
142 | if (p) | |
143 | p++; | |
144 | else | |
145 | p = base_path; | |
146 | p1 = strrchr(base_path, '/'); | |
147 | #ifdef _WIN32 | |
148 | { | |
149 | const char *p2; | |
150 | p2 = strrchr(base_path, '\\'); | |
151 | if (!p1 || p2 > p1) | |
152 | p1 = p2; | |
153 | } | |
154 | #endif | |
155 | if (p1) | |
156 | p1++; | |
157 | else | |
158 | p1 = base_path; | |
159 | if (p1 > p) | |
160 | p = p1; | |
161 | len = p - base_path; | |
162 | if (len > dest_size - 1) | |
163 | len = dest_size - 1; | |
164 | memcpy(dest, base_path, len); | |
165 | dest[len] = '\0'; | |
166 | pstrcat(dest, dest_size, filename); | |
167 | } | |
168 | } | |
169 | ||
170 | void bdrv_register(BlockDriver *bdrv) | |
171 | { | |
172 | if (!bdrv->bdrv_aio_readv) { | |
173 | /* add AIO emulation layer */ | |
174 | bdrv->bdrv_aio_readv = bdrv_aio_readv_em; | |
175 | bdrv->bdrv_aio_writev = bdrv_aio_writev_em; | |
176 | } else if (!bdrv->bdrv_read) { | |
177 | /* add synchronous IO emulation layer */ | |
178 | bdrv->bdrv_read = bdrv_read_em; | |
179 | bdrv->bdrv_write = bdrv_write_em; | |
180 | } | |
181 | ||
182 | if (!bdrv->bdrv_aio_flush) | |
183 | bdrv->bdrv_aio_flush = bdrv_aio_flush_em; | |
184 | ||
185 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); | |
186 | } | |
187 | ||
188 | /* create a new block device (by default it is empty) */ | |
189 | BlockDriverState *bdrv_new(const char *device_name) | |
190 | { | |
191 | BlockDriverState *bs; | |
192 | ||
193 | bs = qemu_mallocz(sizeof(BlockDriverState)); | |
194 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); | |
195 | if (device_name[0] != '\0') { | |
196 | QTAILQ_INSERT_TAIL(&bdrv_states, bs, list); | |
197 | } | |
198 | return bs; | |
199 | } | |
200 | ||
201 | BlockDriver *bdrv_find_format(const char *format_name) | |
202 | { | |
203 | BlockDriver *drv1; | |
204 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { | |
205 | if (!strcmp(drv1->format_name, format_name)) { | |
206 | return drv1; | |
207 | } | |
208 | } | |
209 | return NULL; | |
210 | } | |
211 | ||
212 | static int bdrv_is_whitelisted(BlockDriver *drv) | |
213 | { | |
214 | static const char *whitelist[] = { | |
215 | CONFIG_BDRV_WHITELIST | |
216 | }; | |
217 | const char **p; | |
218 | ||
219 | if (!whitelist[0]) | |
220 | return 1; /* no whitelist, anything goes */ | |
221 | ||
222 | for (p = whitelist; *p; p++) { | |
223 | if (!strcmp(drv->format_name, *p)) { | |
224 | return 1; | |
225 | } | |
226 | } | |
227 | return 0; | |
228 | } | |
229 | ||
230 | BlockDriver *bdrv_find_whitelisted_format(const char *format_name) | |
231 | { | |
232 | BlockDriver *drv = bdrv_find_format(format_name); | |
233 | return drv && bdrv_is_whitelisted(drv) ? drv : NULL; | |
234 | } | |
235 | ||
236 | int bdrv_create(BlockDriver *drv, const char* filename, | |
237 | QEMUOptionParameter *options) | |
238 | { | |
239 | if (!drv->bdrv_create) | |
240 | return -ENOTSUP; | |
241 | ||
242 | return drv->bdrv_create(filename, options); | |
243 | } | |
244 | ||
245 | int bdrv_create_file(const char* filename, QEMUOptionParameter *options) | |
246 | { | |
247 | BlockDriver *drv; | |
248 | ||
249 | drv = bdrv_find_protocol(filename); | |
250 | if (drv == NULL) { | |
251 | return -ENOENT; | |
252 | } | |
253 | ||
254 | return bdrv_create(drv, filename, options); | |
255 | } | |
256 | ||
257 | #ifdef _WIN32 | |
258 | void get_tmp_filename(char *filename, int size) | |
259 | { | |
260 | char temp_dir[MAX_PATH]; | |
261 | ||
262 | GetTempPath(MAX_PATH, temp_dir); | |
263 | GetTempFileName(temp_dir, "qem", 0, filename); | |
264 | } | |
265 | #else | |
266 | void get_tmp_filename(char *filename, int size) | |
267 | { | |
268 | int fd; | |
269 | const char *tmpdir; | |
270 | /* XXX: race condition possible */ | |
271 | tmpdir = getenv("TMPDIR"); | |
272 | if (!tmpdir) | |
273 | tmpdir = "/tmp"; | |
274 | snprintf(filename, size, "%s/vl.XXXXXX", tmpdir); | |
275 | fd = mkstemp(filename); | |
276 | close(fd); | |
277 | } | |
278 | #endif | |
279 | ||
280 | /* | |
281 | * Detect host devices. By convention, /dev/cdrom[N] is always | |
282 | * recognized as a host CDROM. | |
283 | */ | |
284 | static BlockDriver *find_hdev_driver(const char *filename) | |
285 | { | |
286 | int score_max = 0, score; | |
287 | BlockDriver *drv = NULL, *d; | |
288 | ||
289 | QLIST_FOREACH(d, &bdrv_drivers, list) { | |
290 | if (d->bdrv_probe_device) { | |
291 | score = d->bdrv_probe_device(filename); | |
292 | if (score > score_max) { | |
293 | score_max = score; | |
294 | drv = d; | |
295 | } | |
296 | } | |
297 | } | |
298 | ||
299 | return drv; | |
300 | } | |
301 | ||
302 | BlockDriver *bdrv_find_protocol(const char *filename) | |
303 | { | |
304 | BlockDriver *drv1; | |
305 | char protocol[128]; | |
306 | int len; | |
307 | const char *p; | |
308 | ||
309 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ | |
310 | ||
311 | /* | |
312 | * XXX(hch): we really should not let host device detection | |
313 | * override an explicit protocol specification, but moving this | |
314 | * later breaks access to device names with colons in them. | |
315 | * Thanks to the brain-dead persistent naming schemes on udev- | |
316 | * based Linux systems those actually are quite common. | |
317 | */ | |
318 | drv1 = find_hdev_driver(filename); | |
319 | if (drv1) { | |
320 | return drv1; | |
321 | } | |
322 | ||
323 | if (!path_has_protocol(filename)) { | |
324 | return bdrv_find_format("file"); | |
325 | } | |
326 | p = strchr(filename, ':'); | |
327 | assert(p != NULL); | |
328 | len = p - filename; | |
329 | if (len > sizeof(protocol) - 1) | |
330 | len = sizeof(protocol) - 1; | |
331 | memcpy(protocol, filename, len); | |
332 | protocol[len] = '\0'; | |
333 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { | |
334 | if (drv1->protocol_name && | |
335 | !strcmp(drv1->protocol_name, protocol)) { | |
336 | return drv1; | |
337 | } | |
338 | } | |
339 | return NULL; | |
340 | } | |
341 | ||
342 | static int find_image_format(const char *filename, BlockDriver **pdrv) | |
343 | { | |
344 | int ret, score, score_max; | |
345 | BlockDriver *drv1, *drv; | |
346 | uint8_t buf[2048]; | |
347 | BlockDriverState *bs; | |
348 | ||
349 | ret = bdrv_file_open(&bs, filename, 0); | |
350 | if (ret < 0) { | |
351 | *pdrv = NULL; | |
352 | return ret; | |
353 | } | |
354 | ||
355 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ | |
356 | if (bs->sg || !bdrv_is_inserted(bs)) { | |
357 | bdrv_delete(bs); | |
358 | drv = bdrv_find_format("raw"); | |
359 | if (!drv) { | |
360 | ret = -ENOENT; | |
361 | } | |
362 | *pdrv = drv; | |
363 | return ret; | |
364 | } | |
365 | ||
366 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); | |
367 | bdrv_delete(bs); | |
368 | if (ret < 0) { | |
369 | *pdrv = NULL; | |
370 | return ret; | |
371 | } | |
372 | ||
373 | score_max = 0; | |
374 | drv = NULL; | |
375 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { | |
376 | if (drv1->bdrv_probe) { | |
377 | score = drv1->bdrv_probe(buf, ret, filename); | |
378 | if (score > score_max) { | |
379 | score_max = score; | |
380 | drv = drv1; | |
381 | } | |
382 | } | |
383 | } | |
384 | if (!drv) { | |
385 | ret = -ENOENT; | |
386 | } | |
387 | *pdrv = drv; | |
388 | return ret; | |
389 | } | |
390 | ||
391 | /** | |
392 | * Set the current 'total_sectors' value | |
393 | */ | |
394 | static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) | |
395 | { | |
396 | BlockDriver *drv = bs->drv; | |
397 | ||
398 | /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */ | |
399 | if (bs->sg) | |
400 | return 0; | |
401 | ||
402 | /* query actual device if possible, otherwise just trust the hint */ | |
403 | if (drv->bdrv_getlength) { | |
404 | int64_t length = drv->bdrv_getlength(bs); | |
405 | if (length < 0) { | |
406 | return length; | |
407 | } | |
408 | hint = length >> BDRV_SECTOR_BITS; | |
409 | } | |
410 | ||
411 | bs->total_sectors = hint; | |
412 | return 0; | |
413 | } | |
414 | ||
415 | /* | |
416 | * Common part for opening disk images and files | |
417 | */ | |
418 | static int bdrv_open_common(BlockDriverState *bs, const char *filename, | |
419 | int flags, BlockDriver *drv) | |
420 | { | |
421 | int ret, open_flags; | |
422 | ||
423 | assert(drv != NULL); | |
424 | ||
425 | bs->file = NULL; | |
426 | bs->total_sectors = 0; | |
427 | bs->encrypted = 0; | |
428 | bs->valid_key = 0; | |
429 | bs->open_flags = flags; | |
430 | /* buffer_alignment defaulted to 512, drivers can change this value */ | |
431 | bs->buffer_alignment = 512; | |
432 | ||
433 | pstrcpy(bs->filename, sizeof(bs->filename), filename); | |
434 | ||
435 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) { | |
436 | return -ENOTSUP; | |
437 | } | |
438 | ||
439 | bs->drv = drv; | |
440 | bs->opaque = qemu_mallocz(drv->instance_size); | |
441 | ||
442 | /* | |
443 | * Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a | |
444 | * write cache to the guest. We do need the fdatasync to flush | |
445 | * out transactions for block allocations, and we maybe have a | |
446 | * volatile write cache in our backing device to deal with. | |
447 | */ | |
448 | if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE)) | |
449 | bs->enable_write_cache = 1; | |
450 | ||
451 | /* | |
452 | * Clear flags that are internal to the block layer before opening the | |
453 | * image. | |
454 | */ | |
455 | open_flags = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
456 | ||
457 | /* | |
458 | * Snapshots should be writable. | |
459 | */ | |
460 | if (bs->is_temporary) { | |
461 | open_flags |= BDRV_O_RDWR; | |
462 | } | |
463 | ||
464 | /* Open the image, either directly or using a protocol */ | |
465 | if (drv->bdrv_file_open) { | |
466 | ret = drv->bdrv_file_open(bs, filename, open_flags); | |
467 | } else { | |
468 | ret = bdrv_file_open(&bs->file, filename, open_flags); | |
469 | if (ret >= 0) { | |
470 | ret = drv->bdrv_open(bs, open_flags); | |
471 | } | |
472 | } | |
473 | ||
474 | if (ret < 0) { | |
475 | goto free_and_fail; | |
476 | } | |
477 | ||
478 | bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR); | |
479 | ||
480 | ret = refresh_total_sectors(bs, bs->total_sectors); | |
481 | if (ret < 0) { | |
482 | goto free_and_fail; | |
483 | } | |
484 | ||
485 | #ifndef _WIN32 | |
486 | if (bs->is_temporary) { | |
487 | unlink(filename); | |
488 | } | |
489 | #endif | |
490 | return 0; | |
491 | ||
492 | free_and_fail: | |
493 | if (bs->file) { | |
494 | bdrv_delete(bs->file); | |
495 | bs->file = NULL; | |
496 | } | |
497 | qemu_free(bs->opaque); | |
498 | bs->opaque = NULL; | |
499 | bs->drv = NULL; | |
500 | return ret; | |
501 | } | |
502 | ||
503 | /* | |
504 | * Opens a file using a protocol (file, host_device, nbd, ...) | |
505 | */ | |
506 | int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) | |
507 | { | |
508 | BlockDriverState *bs; | |
509 | BlockDriver *drv; | |
510 | int ret; | |
511 | ||
512 | drv = bdrv_find_protocol(filename); | |
513 | if (!drv) { | |
514 | return -ENOENT; | |
515 | } | |
516 | ||
517 | bs = bdrv_new(""); | |
518 | ret = bdrv_open_common(bs, filename, flags, drv); | |
519 | if (ret < 0) { | |
520 | bdrv_delete(bs); | |
521 | return ret; | |
522 | } | |
523 | bs->growable = 1; | |
524 | *pbs = bs; | |
525 | return 0; | |
526 | } | |
527 | ||
528 | /* | |
529 | * Opens a disk image (raw, qcow2, vmdk, ...) | |
530 | */ | |
531 | int bdrv_open(BlockDriverState *bs, const char *filename, int flags, | |
532 | BlockDriver *drv) | |
533 | { | |
534 | int ret; | |
535 | ||
536 | if (flags & BDRV_O_SNAPSHOT) { | |
537 | BlockDriverState *bs1; | |
538 | int64_t total_size; | |
539 | int is_protocol = 0; | |
540 | BlockDriver *bdrv_qcow2; | |
541 | QEMUOptionParameter *options; | |
542 | char tmp_filename[PATH_MAX]; | |
543 | char backing_filename[PATH_MAX]; | |
544 | ||
545 | /* if snapshot, we create a temporary backing file and open it | |
546 | instead of opening 'filename' directly */ | |
547 | ||
548 | /* if there is a backing file, use it */ | |
549 | bs1 = bdrv_new(""); | |
550 | ret = bdrv_open(bs1, filename, 0, drv); | |
551 | if (ret < 0) { | |
552 | bdrv_delete(bs1); | |
553 | return ret; | |
554 | } | |
555 | total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK; | |
556 | ||
557 | if (bs1->drv && bs1->drv->protocol_name) | |
558 | is_protocol = 1; | |
559 | ||
560 | bdrv_delete(bs1); | |
561 | ||
562 | get_tmp_filename(tmp_filename, sizeof(tmp_filename)); | |
563 | ||
564 | /* Real path is meaningless for protocols */ | |
565 | if (is_protocol) | |
566 | snprintf(backing_filename, sizeof(backing_filename), | |
567 | "%s", filename); | |
568 | else if (!realpath(filename, backing_filename)) | |
569 | return -errno; | |
570 | ||
571 | bdrv_qcow2 = bdrv_find_format("qcow2"); | |
572 | options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); | |
573 | ||
574 | set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size); | |
575 | set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); | |
576 | if (drv) { | |
577 | set_option_parameter(options, BLOCK_OPT_BACKING_FMT, | |
578 | drv->format_name); | |
579 | } | |
580 | ||
581 | ret = bdrv_create(bdrv_qcow2, tmp_filename, options); | |
582 | free_option_parameters(options); | |
583 | if (ret < 0) { | |
584 | return ret; | |
585 | } | |
586 | ||
587 | filename = tmp_filename; | |
588 | drv = bdrv_qcow2; | |
589 | bs->is_temporary = 1; | |
590 | } | |
591 | ||
592 | /* Find the right image format driver */ | |
593 | if (!drv) { | |
594 | ret = find_image_format(filename, &drv); | |
595 | } | |
596 | ||
597 | if (!drv) { | |
598 | goto unlink_and_fail; | |
599 | } | |
600 | ||
601 | /* Open the image */ | |
602 | ret = bdrv_open_common(bs, filename, flags, drv); | |
603 | if (ret < 0) { | |
604 | goto unlink_and_fail; | |
605 | } | |
606 | ||
607 | /* If there is a backing file, use it */ | |
608 | if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') { | |
609 | char backing_filename[PATH_MAX]; | |
610 | int back_flags; | |
611 | BlockDriver *back_drv = NULL; | |
612 | ||
613 | bs->backing_hd = bdrv_new(""); | |
614 | ||
615 | if (path_has_protocol(bs->backing_file)) { | |
616 | pstrcpy(backing_filename, sizeof(backing_filename), | |
617 | bs->backing_file); | |
618 | } else { | |
619 | path_combine(backing_filename, sizeof(backing_filename), | |
620 | filename, bs->backing_file); | |
621 | } | |
622 | ||
623 | if (bs->backing_format[0] != '\0') { | |
624 | back_drv = bdrv_find_format(bs->backing_format); | |
625 | } | |
626 | ||
627 | /* backing files always opened read-only */ | |
628 | back_flags = | |
629 | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
630 | ||
631 | ret = bdrv_open(bs->backing_hd, backing_filename, back_flags, back_drv); | |
632 | if (ret < 0) { | |
633 | bdrv_close(bs); | |
634 | return ret; | |
635 | } | |
636 | if (bs->is_temporary) { | |
637 | bs->backing_hd->keep_read_only = !(flags & BDRV_O_RDWR); | |
638 | } else { | |
639 | /* base image inherits from "parent" */ | |
640 | bs->backing_hd->keep_read_only = bs->keep_read_only; | |
641 | } | |
642 | } | |
643 | ||
644 | if (!bdrv_key_required(bs)) { | |
645 | /* call the change callback */ | |
646 | bs->media_changed = 1; | |
647 | if (bs->change_cb) | |
648 | bs->change_cb(bs->change_opaque, CHANGE_MEDIA); | |
649 | } | |
650 | ||
651 | return 0; | |
652 | ||
653 | unlink_and_fail: | |
654 | if (bs->is_temporary) { | |
655 | unlink(filename); | |
656 | } | |
657 | return ret; | |
658 | } | |
659 | ||
660 | void bdrv_close(BlockDriverState *bs) | |
661 | { | |
662 | if (bs->drv) { | |
663 | if (bs == bs_snapshots) { | |
664 | bs_snapshots = NULL; | |
665 | } | |
666 | if (bs->backing_hd) { | |
667 | bdrv_delete(bs->backing_hd); | |
668 | bs->backing_hd = NULL; | |
669 | } | |
670 | bs->drv->bdrv_close(bs); | |
671 | qemu_free(bs->opaque); | |
672 | #ifdef _WIN32 | |
673 | if (bs->is_temporary) { | |
674 | unlink(bs->filename); | |
675 | } | |
676 | #endif | |
677 | bs->opaque = NULL; | |
678 | bs->drv = NULL; | |
679 | ||
680 | if (bs->file != NULL) { | |
681 | bdrv_close(bs->file); | |
682 | } | |
683 | ||
684 | /* call the change callback */ | |
685 | bs->media_changed = 1; | |
686 | if (bs->change_cb) | |
687 | bs->change_cb(bs->change_opaque, CHANGE_MEDIA); | |
688 | } | |
689 | } | |
690 | ||
691 | void bdrv_close_all(void) | |
692 | { | |
693 | BlockDriverState *bs; | |
694 | ||
695 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
696 | bdrv_close(bs); | |
697 | } | |
698 | } | |
699 | ||
700 | /* make a BlockDriverState anonymous by removing from bdrv_state list. | |
701 | Also, NULL terminate the device_name to prevent double remove */ | |
702 | void bdrv_make_anon(BlockDriverState *bs) | |
703 | { | |
704 | if (bs->device_name[0] != '\0') { | |
705 | QTAILQ_REMOVE(&bdrv_states, bs, list); | |
706 | } | |
707 | bs->device_name[0] = '\0'; | |
708 | } | |
709 | ||
710 | void bdrv_delete(BlockDriverState *bs) | |
711 | { | |
712 | assert(!bs->peer); | |
713 | ||
714 | /* remove from list, if necessary */ | |
715 | bdrv_make_anon(bs); | |
716 | ||
717 | bdrv_close(bs); | |
718 | if (bs->file != NULL) { | |
719 | bdrv_delete(bs->file); | |
720 | } | |
721 | ||
722 | assert(bs != bs_snapshots); | |
723 | qemu_free(bs); | |
724 | } | |
725 | ||
726 | int bdrv_attach(BlockDriverState *bs, DeviceState *qdev) | |
727 | { | |
728 | if (bs->peer) { | |
729 | return -EBUSY; | |
730 | } | |
731 | bs->peer = qdev; | |
732 | return 0; | |
733 | } | |
734 | ||
735 | void bdrv_detach(BlockDriverState *bs, DeviceState *qdev) | |
736 | { | |
737 | assert(bs->peer == qdev); | |
738 | bs->peer = NULL; | |
739 | } | |
740 | ||
741 | DeviceState *bdrv_get_attached(BlockDriverState *bs) | |
742 | { | |
743 | return bs->peer; | |
744 | } | |
745 | ||
746 | /* | |
747 | * Run consistency checks on an image | |
748 | * | |
749 | * Returns 0 if the check could be completed (it doesn't mean that the image is | |
750 | * free of errors) or -errno when an internal error occurred. The results of the | |
751 | * check are stored in res. | |
752 | */ | |
753 | int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res) | |
754 | { | |
755 | if (bs->drv->bdrv_check == NULL) { | |
756 | return -ENOTSUP; | |
757 | } | |
758 | ||
759 | memset(res, 0, sizeof(*res)); | |
760 | return bs->drv->bdrv_check(bs, res); | |
761 | } | |
762 | ||
763 | #define COMMIT_BUF_SECTORS 2048 | |
764 | ||
765 | /* commit COW file into the raw image */ | |
766 | int bdrv_commit(BlockDriverState *bs) | |
767 | { | |
768 | BlockDriver *drv = bs->drv; | |
769 | BlockDriver *backing_drv; | |
770 | int64_t sector, total_sectors; | |
771 | int n, ro, open_flags; | |
772 | int ret = 0, rw_ret = 0; | |
773 | uint8_t *buf; | |
774 | char filename[1024]; | |
775 | BlockDriverState *bs_rw, *bs_ro; | |
776 | ||
777 | if (!drv) | |
778 | return -ENOMEDIUM; | |
779 | ||
780 | if (!bs->backing_hd) { | |
781 | return -ENOTSUP; | |
782 | } | |
783 | ||
784 | if (bs->backing_hd->keep_read_only) { | |
785 | return -EACCES; | |
786 | } | |
787 | ||
788 | backing_drv = bs->backing_hd->drv; | |
789 | ro = bs->backing_hd->read_only; | |
790 | strncpy(filename, bs->backing_hd->filename, sizeof(filename)); | |
791 | open_flags = bs->backing_hd->open_flags; | |
792 | ||
793 | if (ro) { | |
794 | /* re-open as RW */ | |
795 | bdrv_delete(bs->backing_hd); | |
796 | bs->backing_hd = NULL; | |
797 | bs_rw = bdrv_new(""); | |
798 | rw_ret = bdrv_open(bs_rw, filename, open_flags | BDRV_O_RDWR, | |
799 | backing_drv); | |
800 | if (rw_ret < 0) { | |
801 | bdrv_delete(bs_rw); | |
802 | /* try to re-open read-only */ | |
803 | bs_ro = bdrv_new(""); | |
804 | ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, | |
805 | backing_drv); | |
806 | if (ret < 0) { | |
807 | bdrv_delete(bs_ro); | |
808 | /* drive not functional anymore */ | |
809 | bs->drv = NULL; | |
810 | return ret; | |
811 | } | |
812 | bs->backing_hd = bs_ro; | |
813 | return rw_ret; | |
814 | } | |
815 | bs->backing_hd = bs_rw; | |
816 | } | |
817 | ||
818 | total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; | |
819 | buf = qemu_malloc(COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); | |
820 | ||
821 | for (sector = 0; sector < total_sectors; sector += n) { | |
822 | if (drv->bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n)) { | |
823 | ||
824 | if (bdrv_read(bs, sector, buf, n) != 0) { | |
825 | ret = -EIO; | |
826 | goto ro_cleanup; | |
827 | } | |
828 | ||
829 | if (bdrv_write(bs->backing_hd, sector, buf, n) != 0) { | |
830 | ret = -EIO; | |
831 | goto ro_cleanup; | |
832 | } | |
833 | } | |
834 | } | |
835 | ||
836 | if (drv->bdrv_make_empty) { | |
837 | ret = drv->bdrv_make_empty(bs); | |
838 | bdrv_flush(bs); | |
839 | } | |
840 | ||
841 | /* | |
842 | * Make sure all data we wrote to the backing device is actually | |
843 | * stable on disk. | |
844 | */ | |
845 | if (bs->backing_hd) | |
846 | bdrv_flush(bs->backing_hd); | |
847 | ||
848 | ro_cleanup: | |
849 | qemu_free(buf); | |
850 | ||
851 | if (ro) { | |
852 | /* re-open as RO */ | |
853 | bdrv_delete(bs->backing_hd); | |
854 | bs->backing_hd = NULL; | |
855 | bs_ro = bdrv_new(""); | |
856 | ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, | |
857 | backing_drv); | |
858 | if (ret < 0) { | |
859 | bdrv_delete(bs_ro); | |
860 | /* drive not functional anymore */ | |
861 | bs->drv = NULL; | |
862 | return ret; | |
863 | } | |
864 | bs->backing_hd = bs_ro; | |
865 | bs->backing_hd->keep_read_only = 0; | |
866 | } | |
867 | ||
868 | return ret; | |
869 | } | |
870 | ||
871 | void bdrv_commit_all(void) | |
872 | { | |
873 | BlockDriverState *bs; | |
874 | ||
875 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
876 | bdrv_commit(bs); | |
877 | } | |
878 | } | |
879 | ||
880 | /* | |
881 | * Return values: | |
882 | * 0 - success | |
883 | * -EINVAL - backing format specified, but no file | |
884 | * -ENOSPC - can't update the backing file because no space is left in the | |
885 | * image file header | |
886 | * -ENOTSUP - format driver doesn't support changing the backing file | |
887 | */ | |
888 | int bdrv_change_backing_file(BlockDriverState *bs, | |
889 | const char *backing_file, const char *backing_fmt) | |
890 | { | |
891 | BlockDriver *drv = bs->drv; | |
892 | ||
893 | if (drv->bdrv_change_backing_file != NULL) { | |
894 | return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); | |
895 | } else { | |
896 | return -ENOTSUP; | |
897 | } | |
898 | } | |
899 | ||
900 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, | |
901 | size_t size) | |
902 | { | |
903 | int64_t len; | |
904 | ||
905 | if (!bdrv_is_inserted(bs)) | |
906 | return -ENOMEDIUM; | |
907 | ||
908 | if (bs->growable) | |
909 | return 0; | |
910 | ||
911 | len = bdrv_getlength(bs); | |
912 | ||
913 | if (offset < 0) | |
914 | return -EIO; | |
915 | ||
916 | if ((offset > len) || (len - offset < size)) | |
917 | return -EIO; | |
918 | ||
919 | return 0; | |
920 | } | |
921 | ||
922 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, | |
923 | int nb_sectors) | |
924 | { | |
925 | return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE, | |
926 | nb_sectors * BDRV_SECTOR_SIZE); | |
927 | } | |
928 | ||
929 | /* return < 0 if error. See bdrv_write() for the return codes */ | |
930 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, | |
931 | uint8_t *buf, int nb_sectors) | |
932 | { | |
933 | BlockDriver *drv = bs->drv; | |
934 | ||
935 | if (!drv) | |
936 | return -ENOMEDIUM; | |
937 | if (bdrv_check_request(bs, sector_num, nb_sectors)) | |
938 | return -EIO; | |
939 | ||
940 | return drv->bdrv_read(bs, sector_num, buf, nb_sectors); | |
941 | } | |
942 | ||
943 | static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num, | |
944 | int nb_sectors, int dirty) | |
945 | { | |
946 | int64_t start, end; | |
947 | unsigned long val, idx, bit; | |
948 | ||
949 | start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; | |
950 | end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK; | |
951 | ||
952 | for (; start <= end; start++) { | |
953 | idx = start / (sizeof(unsigned long) * 8); | |
954 | bit = start % (sizeof(unsigned long) * 8); | |
955 | val = bs->dirty_bitmap[idx]; | |
956 | if (dirty) { | |
957 | if (!(val & (1UL << bit))) { | |
958 | bs->dirty_count++; | |
959 | val |= 1UL << bit; | |
960 | } | |
961 | } else { | |
962 | if (val & (1UL << bit)) { | |
963 | bs->dirty_count--; | |
964 | val &= ~(1UL << bit); | |
965 | } | |
966 | } | |
967 | bs->dirty_bitmap[idx] = val; | |
968 | } | |
969 | } | |
970 | ||
971 | /* Return < 0 if error. Important errors are: | |
972 | -EIO generic I/O error (may happen for all errors) | |
973 | -ENOMEDIUM No media inserted. | |
974 | -EINVAL Invalid sector number or nb_sectors | |
975 | -EACCES Trying to write a read-only device | |
976 | */ | |
977 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, | |
978 | const uint8_t *buf, int nb_sectors) | |
979 | { | |
980 | BlockDriver *drv = bs->drv; | |
981 | if (!bs->drv) | |
982 | return -ENOMEDIUM; | |
983 | if (bs->read_only) | |
984 | return -EACCES; | |
985 | if (bdrv_check_request(bs, sector_num, nb_sectors)) | |
986 | return -EIO; | |
987 | ||
988 | if (bs->dirty_bitmap) { | |
989 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); | |
990 | } | |
991 | ||
992 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { | |
993 | bs->wr_highest_sector = sector_num + nb_sectors - 1; | |
994 | } | |
995 | ||
996 | return drv->bdrv_write(bs, sector_num, buf, nb_sectors); | |
997 | } | |
998 | ||
999 | int bdrv_pread(BlockDriverState *bs, int64_t offset, | |
1000 | void *buf, int count1) | |
1001 | { | |
1002 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; | |
1003 | int len, nb_sectors, count; | |
1004 | int64_t sector_num; | |
1005 | int ret; | |
1006 | ||
1007 | count = count1; | |
1008 | /* first read to align to sector start */ | |
1009 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); | |
1010 | if (len > count) | |
1011 | len = count; | |
1012 | sector_num = offset >> BDRV_SECTOR_BITS; | |
1013 | if (len > 0) { | |
1014 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) | |
1015 | return ret; | |
1016 | memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len); | |
1017 | count -= len; | |
1018 | if (count == 0) | |
1019 | return count1; | |
1020 | sector_num++; | |
1021 | buf += len; | |
1022 | } | |
1023 | ||
1024 | /* read the sectors "in place" */ | |
1025 | nb_sectors = count >> BDRV_SECTOR_BITS; | |
1026 | if (nb_sectors > 0) { | |
1027 | if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0) | |
1028 | return ret; | |
1029 | sector_num += nb_sectors; | |
1030 | len = nb_sectors << BDRV_SECTOR_BITS; | |
1031 | buf += len; | |
1032 | count -= len; | |
1033 | } | |
1034 | ||
1035 | /* add data from the last sector */ | |
1036 | if (count > 0) { | |
1037 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) | |
1038 | return ret; | |
1039 | memcpy(buf, tmp_buf, count); | |
1040 | } | |
1041 | return count1; | |
1042 | } | |
1043 | ||
1044 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, | |
1045 | const void *buf, int count1) | |
1046 | { | |
1047 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; | |
1048 | int len, nb_sectors, count; | |
1049 | int64_t sector_num; | |
1050 | int ret; | |
1051 | ||
1052 | count = count1; | |
1053 | /* first write to align to sector start */ | |
1054 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); | |
1055 | if (len > count) | |
1056 | len = count; | |
1057 | sector_num = offset >> BDRV_SECTOR_BITS; | |
1058 | if (len > 0) { | |
1059 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) | |
1060 | return ret; | |
1061 | memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len); | |
1062 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) | |
1063 | return ret; | |
1064 | count -= len; | |
1065 | if (count == 0) | |
1066 | return count1; | |
1067 | sector_num++; | |
1068 | buf += len; | |
1069 | } | |
1070 | ||
1071 | /* write the sectors "in place" */ | |
1072 | nb_sectors = count >> BDRV_SECTOR_BITS; | |
1073 | if (nb_sectors > 0) { | |
1074 | if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0) | |
1075 | return ret; | |
1076 | sector_num += nb_sectors; | |
1077 | len = nb_sectors << BDRV_SECTOR_BITS; | |
1078 | buf += len; | |
1079 | count -= len; | |
1080 | } | |
1081 | ||
1082 | /* add data from the last sector */ | |
1083 | if (count > 0) { | |
1084 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) | |
1085 | return ret; | |
1086 | memcpy(tmp_buf, buf, count); | |
1087 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) | |
1088 | return ret; | |
1089 | } | |
1090 | return count1; | |
1091 | } | |
1092 | ||
1093 | /* | |
1094 | * Writes to the file and ensures that no writes are reordered across this | |
1095 | * request (acts as a barrier) | |
1096 | * | |
1097 | * Returns 0 on success, -errno in error cases. | |
1098 | */ | |
1099 | int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, | |
1100 | const void *buf, int count) | |
1101 | { | |
1102 | int ret; | |
1103 | ||
1104 | ret = bdrv_pwrite(bs, offset, buf, count); | |
1105 | if (ret < 0) { | |
1106 | return ret; | |
1107 | } | |
1108 | ||
1109 | /* No flush needed for cache=writethrough, it uses O_DSYNC */ | |
1110 | if ((bs->open_flags & BDRV_O_CACHE_MASK) != 0) { | |
1111 | bdrv_flush(bs); | |
1112 | } | |
1113 | ||
1114 | return 0; | |
1115 | } | |
1116 | ||
1117 | /* | |
1118 | * Writes to the file and ensures that no writes are reordered across this | |
1119 | * request (acts as a barrier) | |
1120 | * | |
1121 | * Returns 0 on success, -errno in error cases. | |
1122 | */ | |
1123 | int bdrv_write_sync(BlockDriverState *bs, int64_t sector_num, | |
1124 | const uint8_t *buf, int nb_sectors) | |
1125 | { | |
1126 | return bdrv_pwrite_sync(bs, BDRV_SECTOR_SIZE * sector_num, | |
1127 | buf, BDRV_SECTOR_SIZE * nb_sectors); | |
1128 | } | |
1129 | ||
1130 | /** | |
1131 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
1132 | */ | |
1133 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
1134 | { | |
1135 | BlockDriver *drv = bs->drv; | |
1136 | int ret; | |
1137 | if (!drv) | |
1138 | return -ENOMEDIUM; | |
1139 | if (!drv->bdrv_truncate) | |
1140 | return -ENOTSUP; | |
1141 | if (bs->read_only) | |
1142 | return -EACCES; | |
1143 | if (bdrv_in_use(bs)) | |
1144 | return -EBUSY; | |
1145 | ret = drv->bdrv_truncate(bs, offset); | |
1146 | if (ret == 0) { | |
1147 | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); | |
1148 | if (bs->change_cb) { | |
1149 | bs->change_cb(bs->change_opaque, CHANGE_SIZE); | |
1150 | } | |
1151 | } | |
1152 | return ret; | |
1153 | } | |
1154 | ||
1155 | /** | |
1156 | * Length of a file in bytes. Return < 0 if error or unknown. | |
1157 | */ | |
1158 | int64_t bdrv_getlength(BlockDriverState *bs) | |
1159 | { | |
1160 | BlockDriver *drv = bs->drv; | |
1161 | if (!drv) | |
1162 | return -ENOMEDIUM; | |
1163 | ||
1164 | if (bs->growable || bs->removable) { | |
1165 | if (drv->bdrv_getlength) { | |
1166 | return drv->bdrv_getlength(bs); | |
1167 | } | |
1168 | } | |
1169 | return bs->total_sectors * BDRV_SECTOR_SIZE; | |
1170 | } | |
1171 | ||
1172 | /* return 0 as number of sectors if no device present or error */ | |
1173 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) | |
1174 | { | |
1175 | int64_t length; | |
1176 | length = bdrv_getlength(bs); | |
1177 | if (length < 0) | |
1178 | length = 0; | |
1179 | else | |
1180 | length = length >> BDRV_SECTOR_BITS; | |
1181 | *nb_sectors_ptr = length; | |
1182 | } | |
1183 | ||
1184 | struct partition { | |
1185 | uint8_t boot_ind; /* 0x80 - active */ | |
1186 | uint8_t head; /* starting head */ | |
1187 | uint8_t sector; /* starting sector */ | |
1188 | uint8_t cyl; /* starting cylinder */ | |
1189 | uint8_t sys_ind; /* What partition type */ | |
1190 | uint8_t end_head; /* end head */ | |
1191 | uint8_t end_sector; /* end sector */ | |
1192 | uint8_t end_cyl; /* end cylinder */ | |
1193 | uint32_t start_sect; /* starting sector counting from 0 */ | |
1194 | uint32_t nr_sects; /* nr of sectors in partition */ | |
1195 | } __attribute__((packed)); | |
1196 | ||
1197 | /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */ | |
1198 | static int guess_disk_lchs(BlockDriverState *bs, | |
1199 | int *pcylinders, int *pheads, int *psectors) | |
1200 | { | |
1201 | uint8_t buf[BDRV_SECTOR_SIZE]; | |
1202 | int ret, i, heads, sectors, cylinders; | |
1203 | struct partition *p; | |
1204 | uint32_t nr_sects; | |
1205 | uint64_t nb_sectors; | |
1206 | ||
1207 | bdrv_get_geometry(bs, &nb_sectors); | |
1208 | ||
1209 | ret = bdrv_read(bs, 0, buf, 1); | |
1210 | if (ret < 0) | |
1211 | return -1; | |
1212 | /* test msdos magic */ | |
1213 | if (buf[510] != 0x55 || buf[511] != 0xaa) | |
1214 | return -1; | |
1215 | for(i = 0; i < 4; i++) { | |
1216 | p = ((struct partition *)(buf + 0x1be)) + i; | |
1217 | nr_sects = le32_to_cpu(p->nr_sects); | |
1218 | if (nr_sects && p->end_head) { | |
1219 | /* We make the assumption that the partition terminates on | |
1220 | a cylinder boundary */ | |
1221 | heads = p->end_head + 1; | |
1222 | sectors = p->end_sector & 63; | |
1223 | if (sectors == 0) | |
1224 | continue; | |
1225 | cylinders = nb_sectors / (heads * sectors); | |
1226 | if (cylinders < 1 || cylinders > 16383) | |
1227 | continue; | |
1228 | *pheads = heads; | |
1229 | *psectors = sectors; | |
1230 | *pcylinders = cylinders; | |
1231 | #if 0 | |
1232 | printf("guessed geometry: LCHS=%d %d %d\n", | |
1233 | cylinders, heads, sectors); | |
1234 | #endif | |
1235 | return 0; | |
1236 | } | |
1237 | } | |
1238 | return -1; | |
1239 | } | |
1240 | ||
1241 | void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) | |
1242 | { | |
1243 | int translation, lba_detected = 0; | |
1244 | int cylinders, heads, secs; | |
1245 | uint64_t nb_sectors; | |
1246 | ||
1247 | /* if a geometry hint is available, use it */ | |
1248 | bdrv_get_geometry(bs, &nb_sectors); | |
1249 | bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); | |
1250 | translation = bdrv_get_translation_hint(bs); | |
1251 | if (cylinders != 0) { | |
1252 | *pcyls = cylinders; | |
1253 | *pheads = heads; | |
1254 | *psecs = secs; | |
1255 | } else { | |
1256 | if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { | |
1257 | if (heads > 16) { | |
1258 | /* if heads > 16, it means that a BIOS LBA | |
1259 | translation was active, so the default | |
1260 | hardware geometry is OK */ | |
1261 | lba_detected = 1; | |
1262 | goto default_geometry; | |
1263 | } else { | |
1264 | *pcyls = cylinders; | |
1265 | *pheads = heads; | |
1266 | *psecs = secs; | |
1267 | /* disable any translation to be in sync with | |
1268 | the logical geometry */ | |
1269 | if (translation == BIOS_ATA_TRANSLATION_AUTO) { | |
1270 | bdrv_set_translation_hint(bs, | |
1271 | BIOS_ATA_TRANSLATION_NONE); | |
1272 | } | |
1273 | } | |
1274 | } else { | |
1275 | default_geometry: | |
1276 | /* if no geometry, use a standard physical disk geometry */ | |
1277 | cylinders = nb_sectors / (16 * 63); | |
1278 | ||
1279 | if (cylinders > 16383) | |
1280 | cylinders = 16383; | |
1281 | else if (cylinders < 2) | |
1282 | cylinders = 2; | |
1283 | *pcyls = cylinders; | |
1284 | *pheads = 16; | |
1285 | *psecs = 63; | |
1286 | if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { | |
1287 | if ((*pcyls * *pheads) <= 131072) { | |
1288 | bdrv_set_translation_hint(bs, | |
1289 | BIOS_ATA_TRANSLATION_LARGE); | |
1290 | } else { | |
1291 | bdrv_set_translation_hint(bs, | |
1292 | BIOS_ATA_TRANSLATION_LBA); | |
1293 | } | |
1294 | } | |
1295 | } | |
1296 | bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); | |
1297 | } | |
1298 | } | |
1299 | ||
1300 | void bdrv_set_geometry_hint(BlockDriverState *bs, | |
1301 | int cyls, int heads, int secs) | |
1302 | { | |
1303 | bs->cyls = cyls; | |
1304 | bs->heads = heads; | |
1305 | bs->secs = secs; | |
1306 | } | |
1307 | ||
1308 | void bdrv_set_type_hint(BlockDriverState *bs, int type) | |
1309 | { | |
1310 | bs->type = type; | |
1311 | bs->removable = ((type == BDRV_TYPE_CDROM || | |
1312 | type == BDRV_TYPE_FLOPPY)); | |
1313 | } | |
1314 | ||
1315 | void bdrv_set_translation_hint(BlockDriverState *bs, int translation) | |
1316 | { | |
1317 | bs->translation = translation; | |
1318 | } | |
1319 | ||
1320 | void bdrv_get_geometry_hint(BlockDriverState *bs, | |
1321 | int *pcyls, int *pheads, int *psecs) | |
1322 | { | |
1323 | *pcyls = bs->cyls; | |
1324 | *pheads = bs->heads; | |
1325 | *psecs = bs->secs; | |
1326 | } | |
1327 | ||
1328 | /* Recognize floppy formats */ | |
1329 | typedef struct FDFormat { | |
1330 | FDriveType drive; | |
1331 | uint8_t last_sect; | |
1332 | uint8_t max_track; | |
1333 | uint8_t max_head; | |
1334 | } FDFormat; | |
1335 | ||
1336 | static const FDFormat fd_formats[] = { | |
1337 | /* First entry is default format */ | |
1338 | /* 1.44 MB 3"1/2 floppy disks */ | |
1339 | { FDRIVE_DRV_144, 18, 80, 1, }, | |
1340 | { FDRIVE_DRV_144, 20, 80, 1, }, | |
1341 | { FDRIVE_DRV_144, 21, 80, 1, }, | |
1342 | { FDRIVE_DRV_144, 21, 82, 1, }, | |
1343 | { FDRIVE_DRV_144, 21, 83, 1, }, | |
1344 | { FDRIVE_DRV_144, 22, 80, 1, }, | |
1345 | { FDRIVE_DRV_144, 23, 80, 1, }, | |
1346 | { FDRIVE_DRV_144, 24, 80, 1, }, | |
1347 | /* 2.88 MB 3"1/2 floppy disks */ | |
1348 | { FDRIVE_DRV_288, 36, 80, 1, }, | |
1349 | { FDRIVE_DRV_288, 39, 80, 1, }, | |
1350 | { FDRIVE_DRV_288, 40, 80, 1, }, | |
1351 | { FDRIVE_DRV_288, 44, 80, 1, }, | |
1352 | { FDRIVE_DRV_288, 48, 80, 1, }, | |
1353 | /* 720 kB 3"1/2 floppy disks */ | |
1354 | { FDRIVE_DRV_144, 9, 80, 1, }, | |
1355 | { FDRIVE_DRV_144, 10, 80, 1, }, | |
1356 | { FDRIVE_DRV_144, 10, 82, 1, }, | |
1357 | { FDRIVE_DRV_144, 10, 83, 1, }, | |
1358 | { FDRIVE_DRV_144, 13, 80, 1, }, | |
1359 | { FDRIVE_DRV_144, 14, 80, 1, }, | |
1360 | /* 1.2 MB 5"1/4 floppy disks */ | |
1361 | { FDRIVE_DRV_120, 15, 80, 1, }, | |
1362 | { FDRIVE_DRV_120, 18, 80, 1, }, | |
1363 | { FDRIVE_DRV_120, 18, 82, 1, }, | |
1364 | { FDRIVE_DRV_120, 18, 83, 1, }, | |
1365 | { FDRIVE_DRV_120, 20, 80, 1, }, | |
1366 | /* 720 kB 5"1/4 floppy disks */ | |
1367 | { FDRIVE_DRV_120, 9, 80, 1, }, | |
1368 | { FDRIVE_DRV_120, 11, 80, 1, }, | |
1369 | /* 360 kB 5"1/4 floppy disks */ | |
1370 | { FDRIVE_DRV_120, 9, 40, 1, }, | |
1371 | { FDRIVE_DRV_120, 9, 40, 0, }, | |
1372 | { FDRIVE_DRV_120, 10, 41, 1, }, | |
1373 | { FDRIVE_DRV_120, 10, 42, 1, }, | |
1374 | /* 320 kB 5"1/4 floppy disks */ | |
1375 | { FDRIVE_DRV_120, 8, 40, 1, }, | |
1376 | { FDRIVE_DRV_120, 8, 40, 0, }, | |
1377 | /* 360 kB must match 5"1/4 better than 3"1/2... */ | |
1378 | { FDRIVE_DRV_144, 9, 80, 0, }, | |
1379 | /* end */ | |
1380 | { FDRIVE_DRV_NONE, -1, -1, 0, }, | |
1381 | }; | |
1382 | ||
1383 | void bdrv_get_floppy_geometry_hint(BlockDriverState *bs, int *nb_heads, | |
1384 | int *max_track, int *last_sect, | |
1385 | FDriveType drive_in, FDriveType *drive) | |
1386 | { | |
1387 | const FDFormat *parse; | |
1388 | uint64_t nb_sectors, size; | |
1389 | int i, first_match, match; | |
1390 | ||
1391 | bdrv_get_geometry_hint(bs, nb_heads, max_track, last_sect); | |
1392 | if (*nb_heads != 0 && *max_track != 0 && *last_sect != 0) { | |
1393 | /* User defined disk */ | |
1394 | } else { | |
1395 | bdrv_get_geometry(bs, &nb_sectors); | |
1396 | match = -1; | |
1397 | first_match = -1; | |
1398 | for (i = 0; ; i++) { | |
1399 | parse = &fd_formats[i]; | |
1400 | if (parse->drive == FDRIVE_DRV_NONE) { | |
1401 | break; | |
1402 | } | |
1403 | if (drive_in == parse->drive || | |
1404 | drive_in == FDRIVE_DRV_NONE) { | |
1405 | size = (parse->max_head + 1) * parse->max_track * | |
1406 | parse->last_sect; | |
1407 | if (nb_sectors == size) { | |
1408 | match = i; | |
1409 | break; | |
1410 | } | |
1411 | if (first_match == -1) { | |
1412 | first_match = i; | |
1413 | } | |
1414 | } | |
1415 | } | |
1416 | if (match == -1) { | |
1417 | if (first_match == -1) { | |
1418 | match = 1; | |
1419 | } else { | |
1420 | match = first_match; | |
1421 | } | |
1422 | parse = &fd_formats[match]; | |
1423 | } | |
1424 | *nb_heads = parse->max_head + 1; | |
1425 | *max_track = parse->max_track; | |
1426 | *last_sect = parse->last_sect; | |
1427 | *drive = parse->drive; | |
1428 | } | |
1429 | } | |
1430 | ||
1431 | int bdrv_get_type_hint(BlockDriverState *bs) | |
1432 | { | |
1433 | return bs->type; | |
1434 | } | |
1435 | ||
1436 | int bdrv_get_translation_hint(BlockDriverState *bs) | |
1437 | { | |
1438 | return bs->translation; | |
1439 | } | |
1440 | ||
1441 | void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error, | |
1442 | BlockErrorAction on_write_error) | |
1443 | { | |
1444 | bs->on_read_error = on_read_error; | |
1445 | bs->on_write_error = on_write_error; | |
1446 | } | |
1447 | ||
1448 | BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read) | |
1449 | { | |
1450 | return is_read ? bs->on_read_error : bs->on_write_error; | |
1451 | } | |
1452 | ||
1453 | void bdrv_set_removable(BlockDriverState *bs, int removable) | |
1454 | { | |
1455 | bs->removable = removable; | |
1456 | if (removable && bs == bs_snapshots) { | |
1457 | bs_snapshots = NULL; | |
1458 | } | |
1459 | } | |
1460 | ||
1461 | int bdrv_is_removable(BlockDriverState *bs) | |
1462 | { | |
1463 | return bs->removable; | |
1464 | } | |
1465 | ||
1466 | int bdrv_is_read_only(BlockDriverState *bs) | |
1467 | { | |
1468 | return bs->read_only; | |
1469 | } | |
1470 | ||
1471 | int bdrv_is_sg(BlockDriverState *bs) | |
1472 | { | |
1473 | return bs->sg; | |
1474 | } | |
1475 | ||
1476 | int bdrv_enable_write_cache(BlockDriverState *bs) | |
1477 | { | |
1478 | return bs->enable_write_cache; | |
1479 | } | |
1480 | ||
1481 | /* XXX: no longer used */ | |
1482 | void bdrv_set_change_cb(BlockDriverState *bs, | |
1483 | void (*change_cb)(void *opaque, int reason), | |
1484 | void *opaque) | |
1485 | { | |
1486 | bs->change_cb = change_cb; | |
1487 | bs->change_opaque = opaque; | |
1488 | } | |
1489 | ||
1490 | int bdrv_is_encrypted(BlockDriverState *bs) | |
1491 | { | |
1492 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
1493 | return 1; | |
1494 | return bs->encrypted; | |
1495 | } | |
1496 | ||
1497 | int bdrv_key_required(BlockDriverState *bs) | |
1498 | { | |
1499 | BlockDriverState *backing_hd = bs->backing_hd; | |
1500 | ||
1501 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) | |
1502 | return 1; | |
1503 | return (bs->encrypted && !bs->valid_key); | |
1504 | } | |
1505 | ||
1506 | int bdrv_set_key(BlockDriverState *bs, const char *key) | |
1507 | { | |
1508 | int ret; | |
1509 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
1510 | ret = bdrv_set_key(bs->backing_hd, key); | |
1511 | if (ret < 0) | |
1512 | return ret; | |
1513 | if (!bs->encrypted) | |
1514 | return 0; | |
1515 | } | |
1516 | if (!bs->encrypted) { | |
1517 | return -EINVAL; | |
1518 | } else if (!bs->drv || !bs->drv->bdrv_set_key) { | |
1519 | return -ENOMEDIUM; | |
1520 | } | |
1521 | ret = bs->drv->bdrv_set_key(bs, key); | |
1522 | if (ret < 0) { | |
1523 | bs->valid_key = 0; | |
1524 | } else if (!bs->valid_key) { | |
1525 | bs->valid_key = 1; | |
1526 | /* call the change callback now, we skipped it on open */ | |
1527 | bs->media_changed = 1; | |
1528 | if (bs->change_cb) | |
1529 | bs->change_cb(bs->change_opaque, CHANGE_MEDIA); | |
1530 | } | |
1531 | return ret; | |
1532 | } | |
1533 | ||
1534 | void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) | |
1535 | { | |
1536 | if (!bs->drv) { | |
1537 | buf[0] = '\0'; | |
1538 | } else { | |
1539 | pstrcpy(buf, buf_size, bs->drv->format_name); | |
1540 | } | |
1541 | } | |
1542 | ||
1543 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), | |
1544 | void *opaque) | |
1545 | { | |
1546 | BlockDriver *drv; | |
1547 | ||
1548 | QLIST_FOREACH(drv, &bdrv_drivers, list) { | |
1549 | it(opaque, drv->format_name); | |
1550 | } | |
1551 | } | |
1552 | ||
1553 | BlockDriverState *bdrv_find(const char *name) | |
1554 | { | |
1555 | BlockDriverState *bs; | |
1556 | ||
1557 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1558 | if (!strcmp(name, bs->device_name)) { | |
1559 | return bs; | |
1560 | } | |
1561 | } | |
1562 | return NULL; | |
1563 | } | |
1564 | ||
1565 | BlockDriverState *bdrv_next(BlockDriverState *bs) | |
1566 | { | |
1567 | if (!bs) { | |
1568 | return QTAILQ_FIRST(&bdrv_states); | |
1569 | } | |
1570 | return QTAILQ_NEXT(bs, list); | |
1571 | } | |
1572 | ||
1573 | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) | |
1574 | { | |
1575 | BlockDriverState *bs; | |
1576 | ||
1577 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1578 | it(opaque, bs); | |
1579 | } | |
1580 | } | |
1581 | ||
1582 | const char *bdrv_get_device_name(BlockDriverState *bs) | |
1583 | { | |
1584 | return bs->device_name; | |
1585 | } | |
1586 | ||
1587 | int bdrv_flush(BlockDriverState *bs) | |
1588 | { | |
1589 | if (bs->open_flags & BDRV_O_NO_FLUSH) { | |
1590 | return 0; | |
1591 | } | |
1592 | ||
1593 | if (bs->drv && bs->drv->bdrv_flush) { | |
1594 | return bs->drv->bdrv_flush(bs); | |
1595 | } | |
1596 | ||
1597 | /* | |
1598 | * Some block drivers always operate in either writethrough or unsafe mode | |
1599 | * and don't support bdrv_flush therefore. Usually qemu doesn't know how | |
1600 | * the server works (because the behaviour is hardcoded or depends on | |
1601 | * server-side configuration), so we can't ensure that everything is safe | |
1602 | * on disk. Returning an error doesn't work because that would break guests | |
1603 | * even if the server operates in writethrough mode. | |
1604 | * | |
1605 | * Let's hope the user knows what he's doing. | |
1606 | */ | |
1607 | return 0; | |
1608 | } | |
1609 | ||
1610 | void bdrv_flush_all(void) | |
1611 | { | |
1612 | BlockDriverState *bs; | |
1613 | ||
1614 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1615 | if (bs->drv && !bdrv_is_read_only(bs) && | |
1616 | (!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) { | |
1617 | bdrv_flush(bs); | |
1618 | } | |
1619 | } | |
1620 | } | |
1621 | ||
1622 | int bdrv_has_zero_init(BlockDriverState *bs) | |
1623 | { | |
1624 | assert(bs->drv); | |
1625 | ||
1626 | if (bs->drv->bdrv_has_zero_init) { | |
1627 | return bs->drv->bdrv_has_zero_init(bs); | |
1628 | } | |
1629 | ||
1630 | return 1; | |
1631 | } | |
1632 | ||
1633 | int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors) | |
1634 | { | |
1635 | if (!bs->drv) { | |
1636 | return -ENOMEDIUM; | |
1637 | } | |
1638 | if (!bs->drv->bdrv_discard) { | |
1639 | return 0; | |
1640 | } | |
1641 | return bs->drv->bdrv_discard(bs, sector_num, nb_sectors); | |
1642 | } | |
1643 | ||
1644 | /* | |
1645 | * Returns true iff the specified sector is present in the disk image. Drivers | |
1646 | * not implementing the functionality are assumed to not support backing files, | |
1647 | * hence all their sectors are reported as allocated. | |
1648 | * | |
1649 | * 'pnum' is set to the number of sectors (including and immediately following | |
1650 | * the specified sector) that are known to be in the same | |
1651 | * allocated/unallocated state. | |
1652 | * | |
1653 | * 'nb_sectors' is the max value 'pnum' should be set to. | |
1654 | */ | |
1655 | int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, | |
1656 | int *pnum) | |
1657 | { | |
1658 | int64_t n; | |
1659 | if (!bs->drv->bdrv_is_allocated) { | |
1660 | if (sector_num >= bs->total_sectors) { | |
1661 | *pnum = 0; | |
1662 | return 0; | |
1663 | } | |
1664 | n = bs->total_sectors - sector_num; | |
1665 | *pnum = (n < nb_sectors) ? (n) : (nb_sectors); | |
1666 | return 1; | |
1667 | } | |
1668 | return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum); | |
1669 | } | |
1670 | ||
1671 | void bdrv_mon_event(const BlockDriverState *bdrv, | |
1672 | BlockMonEventAction action, int is_read) | |
1673 | { | |
1674 | QObject *data; | |
1675 | const char *action_str; | |
1676 | ||
1677 | switch (action) { | |
1678 | case BDRV_ACTION_REPORT: | |
1679 | action_str = "report"; | |
1680 | break; | |
1681 | case BDRV_ACTION_IGNORE: | |
1682 | action_str = "ignore"; | |
1683 | break; | |
1684 | case BDRV_ACTION_STOP: | |
1685 | action_str = "stop"; | |
1686 | break; | |
1687 | default: | |
1688 | abort(); | |
1689 | } | |
1690 | ||
1691 | data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }", | |
1692 | bdrv->device_name, | |
1693 | action_str, | |
1694 | is_read ? "read" : "write"); | |
1695 | monitor_protocol_event(QEVENT_BLOCK_IO_ERROR, data); | |
1696 | ||
1697 | qobject_decref(data); | |
1698 | } | |
1699 | ||
1700 | static void bdrv_print_dict(QObject *obj, void *opaque) | |
1701 | { | |
1702 | QDict *bs_dict; | |
1703 | Monitor *mon = opaque; | |
1704 | ||
1705 | bs_dict = qobject_to_qdict(obj); | |
1706 | ||
1707 | monitor_printf(mon, "%s: type=%s removable=%d", | |
1708 | qdict_get_str(bs_dict, "device"), | |
1709 | qdict_get_str(bs_dict, "type"), | |
1710 | qdict_get_bool(bs_dict, "removable")); | |
1711 | ||
1712 | if (qdict_get_bool(bs_dict, "removable")) { | |
1713 | monitor_printf(mon, " locked=%d", qdict_get_bool(bs_dict, "locked")); | |
1714 | } | |
1715 | ||
1716 | if (qdict_haskey(bs_dict, "inserted")) { | |
1717 | QDict *qdict = qobject_to_qdict(qdict_get(bs_dict, "inserted")); | |
1718 | ||
1719 | monitor_printf(mon, " file="); | |
1720 | monitor_print_filename(mon, qdict_get_str(qdict, "file")); | |
1721 | if (qdict_haskey(qdict, "backing_file")) { | |
1722 | monitor_printf(mon, " backing_file="); | |
1723 | monitor_print_filename(mon, qdict_get_str(qdict, "backing_file")); | |
1724 | } | |
1725 | monitor_printf(mon, " ro=%d drv=%s encrypted=%d", | |
1726 | qdict_get_bool(qdict, "ro"), | |
1727 | qdict_get_str(qdict, "drv"), | |
1728 | qdict_get_bool(qdict, "encrypted")); | |
1729 | } else { | |
1730 | monitor_printf(mon, " [not inserted]"); | |
1731 | } | |
1732 | ||
1733 | monitor_printf(mon, "\n"); | |
1734 | } | |
1735 | ||
1736 | void bdrv_info_print(Monitor *mon, const QObject *data) | |
1737 | { | |
1738 | qlist_iter(qobject_to_qlist(data), bdrv_print_dict, mon); | |
1739 | } | |
1740 | ||
1741 | void bdrv_info(Monitor *mon, QObject **ret_data) | |
1742 | { | |
1743 | QList *bs_list; | |
1744 | BlockDriverState *bs; | |
1745 | ||
1746 | bs_list = qlist_new(); | |
1747 | ||
1748 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1749 | QObject *bs_obj; | |
1750 | const char *type = "unknown"; | |
1751 | ||
1752 | switch(bs->type) { | |
1753 | case BDRV_TYPE_HD: | |
1754 | type = "hd"; | |
1755 | break; | |
1756 | case BDRV_TYPE_CDROM: | |
1757 | type = "cdrom"; | |
1758 | break; | |
1759 | case BDRV_TYPE_FLOPPY: | |
1760 | type = "floppy"; | |
1761 | break; | |
1762 | } | |
1763 | ||
1764 | bs_obj = qobject_from_jsonf("{ 'device': %s, 'type': %s, " | |
1765 | "'removable': %i, 'locked': %i }", | |
1766 | bs->device_name, type, bs->removable, | |
1767 | bs->locked); | |
1768 | ||
1769 | if (bs->drv) { | |
1770 | QObject *obj; | |
1771 | QDict *bs_dict = qobject_to_qdict(bs_obj); | |
1772 | ||
1773 | obj = qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, " | |
1774 | "'encrypted': %i }", | |
1775 | bs->filename, bs->read_only, | |
1776 | bs->drv->format_name, | |
1777 | bdrv_is_encrypted(bs)); | |
1778 | if (bs->backing_file[0] != '\0') { | |
1779 | QDict *qdict = qobject_to_qdict(obj); | |
1780 | qdict_put(qdict, "backing_file", | |
1781 | qstring_from_str(bs->backing_file)); | |
1782 | } | |
1783 | ||
1784 | qdict_put_obj(bs_dict, "inserted", obj); | |
1785 | } | |
1786 | qlist_append_obj(bs_list, bs_obj); | |
1787 | } | |
1788 | ||
1789 | *ret_data = QOBJECT(bs_list); | |
1790 | } | |
1791 | ||
1792 | static void bdrv_stats_iter(QObject *data, void *opaque) | |
1793 | { | |
1794 | QDict *qdict; | |
1795 | Monitor *mon = opaque; | |
1796 | ||
1797 | qdict = qobject_to_qdict(data); | |
1798 | monitor_printf(mon, "%s:", qdict_get_str(qdict, "device")); | |
1799 | ||
1800 | qdict = qobject_to_qdict(qdict_get(qdict, "stats")); | |
1801 | monitor_printf(mon, " rd_bytes=%" PRId64 | |
1802 | " wr_bytes=%" PRId64 | |
1803 | " rd_operations=%" PRId64 | |
1804 | " wr_operations=%" PRId64 | |
1805 | "\n", | |
1806 | qdict_get_int(qdict, "rd_bytes"), | |
1807 | qdict_get_int(qdict, "wr_bytes"), | |
1808 | qdict_get_int(qdict, "rd_operations"), | |
1809 | qdict_get_int(qdict, "wr_operations")); | |
1810 | } | |
1811 | ||
1812 | void bdrv_stats_print(Monitor *mon, const QObject *data) | |
1813 | { | |
1814 | qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon); | |
1815 | } | |
1816 | ||
1817 | static QObject* bdrv_info_stats_bs(BlockDriverState *bs) | |
1818 | { | |
1819 | QObject *res; | |
1820 | QDict *dict; | |
1821 | ||
1822 | res = qobject_from_jsonf("{ 'stats': {" | |
1823 | "'rd_bytes': %" PRId64 "," | |
1824 | "'wr_bytes': %" PRId64 "," | |
1825 | "'rd_operations': %" PRId64 "," | |
1826 | "'wr_operations': %" PRId64 "," | |
1827 | "'wr_highest_offset': %" PRId64 | |
1828 | "} }", | |
1829 | bs->rd_bytes, bs->wr_bytes, | |
1830 | bs->rd_ops, bs->wr_ops, | |
1831 | bs->wr_highest_sector * | |
1832 | (uint64_t)BDRV_SECTOR_SIZE); | |
1833 | dict = qobject_to_qdict(res); | |
1834 | ||
1835 | if (*bs->device_name) { | |
1836 | qdict_put(dict, "device", qstring_from_str(bs->device_name)); | |
1837 | } | |
1838 | ||
1839 | if (bs->file) { | |
1840 | QObject *parent = bdrv_info_stats_bs(bs->file); | |
1841 | qdict_put_obj(dict, "parent", parent); | |
1842 | } | |
1843 | ||
1844 | return res; | |
1845 | } | |
1846 | ||
1847 | void bdrv_info_stats(Monitor *mon, QObject **ret_data) | |
1848 | { | |
1849 | QObject *obj; | |
1850 | QList *devices; | |
1851 | BlockDriverState *bs; | |
1852 | ||
1853 | devices = qlist_new(); | |
1854 | ||
1855 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1856 | obj = bdrv_info_stats_bs(bs); | |
1857 | qlist_append_obj(devices, obj); | |
1858 | } | |
1859 | ||
1860 | *ret_data = QOBJECT(devices); | |
1861 | } | |
1862 | ||
1863 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) | |
1864 | { | |
1865 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
1866 | return bs->backing_file; | |
1867 | else if (bs->encrypted) | |
1868 | return bs->filename; | |
1869 | else | |
1870 | return NULL; | |
1871 | } | |
1872 | ||
1873 | void bdrv_get_backing_filename(BlockDriverState *bs, | |
1874 | char *filename, int filename_size) | |
1875 | { | |
1876 | if (!bs->backing_file) { | |
1877 | pstrcpy(filename, filename_size, ""); | |
1878 | } else { | |
1879 | pstrcpy(filename, filename_size, bs->backing_file); | |
1880 | } | |
1881 | } | |
1882 | ||
1883 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, | |
1884 | const uint8_t *buf, int nb_sectors) | |
1885 | { | |
1886 | BlockDriver *drv = bs->drv; | |
1887 | if (!drv) | |
1888 | return -ENOMEDIUM; | |
1889 | if (!drv->bdrv_write_compressed) | |
1890 | return -ENOTSUP; | |
1891 | if (bdrv_check_request(bs, sector_num, nb_sectors)) | |
1892 | return -EIO; | |
1893 | ||
1894 | if (bs->dirty_bitmap) { | |
1895 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); | |
1896 | } | |
1897 | ||
1898 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); | |
1899 | } | |
1900 | ||
1901 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) | |
1902 | { | |
1903 | BlockDriver *drv = bs->drv; | |
1904 | if (!drv) | |
1905 | return -ENOMEDIUM; | |
1906 | if (!drv->bdrv_get_info) | |
1907 | return -ENOTSUP; | |
1908 | memset(bdi, 0, sizeof(*bdi)); | |
1909 | return drv->bdrv_get_info(bs, bdi); | |
1910 | } | |
1911 | ||
1912 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, | |
1913 | int64_t pos, int size) | |
1914 | { | |
1915 | BlockDriver *drv = bs->drv; | |
1916 | if (!drv) | |
1917 | return -ENOMEDIUM; | |
1918 | if (drv->bdrv_save_vmstate) | |
1919 | return drv->bdrv_save_vmstate(bs, buf, pos, size); | |
1920 | if (bs->file) | |
1921 | return bdrv_save_vmstate(bs->file, buf, pos, size); | |
1922 | return -ENOTSUP; | |
1923 | } | |
1924 | ||
1925 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, | |
1926 | int64_t pos, int size) | |
1927 | { | |
1928 | BlockDriver *drv = bs->drv; | |
1929 | if (!drv) | |
1930 | return -ENOMEDIUM; | |
1931 | if (drv->bdrv_load_vmstate) | |
1932 | return drv->bdrv_load_vmstate(bs, buf, pos, size); | |
1933 | if (bs->file) | |
1934 | return bdrv_load_vmstate(bs->file, buf, pos, size); | |
1935 | return -ENOTSUP; | |
1936 | } | |
1937 | ||
1938 | void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event) | |
1939 | { | |
1940 | BlockDriver *drv = bs->drv; | |
1941 | ||
1942 | if (!drv || !drv->bdrv_debug_event) { | |
1943 | return; | |
1944 | } | |
1945 | ||
1946 | return drv->bdrv_debug_event(bs, event); | |
1947 | ||
1948 | } | |
1949 | ||
1950 | /**************************************************************/ | |
1951 | /* handling of snapshots */ | |
1952 | ||
1953 | int bdrv_can_snapshot(BlockDriverState *bs) | |
1954 | { | |
1955 | BlockDriver *drv = bs->drv; | |
1956 | if (!drv || bdrv_is_removable(bs) || bdrv_is_read_only(bs)) { | |
1957 | return 0; | |
1958 | } | |
1959 | ||
1960 | if (!drv->bdrv_snapshot_create) { | |
1961 | if (bs->file != NULL) { | |
1962 | return bdrv_can_snapshot(bs->file); | |
1963 | } | |
1964 | return 0; | |
1965 | } | |
1966 | ||
1967 | return 1; | |
1968 | } | |
1969 | ||
1970 | int bdrv_is_snapshot(BlockDriverState *bs) | |
1971 | { | |
1972 | return !!(bs->open_flags & BDRV_O_SNAPSHOT); | |
1973 | } | |
1974 | ||
1975 | BlockDriverState *bdrv_snapshots(void) | |
1976 | { | |
1977 | BlockDriverState *bs; | |
1978 | ||
1979 | if (bs_snapshots) { | |
1980 | return bs_snapshots; | |
1981 | } | |
1982 | ||
1983 | bs = NULL; | |
1984 | while ((bs = bdrv_next(bs))) { | |
1985 | if (bdrv_can_snapshot(bs)) { | |
1986 | bs_snapshots = bs; | |
1987 | return bs; | |
1988 | } | |
1989 | } | |
1990 | return NULL; | |
1991 | } | |
1992 | ||
1993 | int bdrv_snapshot_create(BlockDriverState *bs, | |
1994 | QEMUSnapshotInfo *sn_info) | |
1995 | { | |
1996 | BlockDriver *drv = bs->drv; | |
1997 | if (!drv) | |
1998 | return -ENOMEDIUM; | |
1999 | if (drv->bdrv_snapshot_create) | |
2000 | return drv->bdrv_snapshot_create(bs, sn_info); | |
2001 | if (bs->file) | |
2002 | return bdrv_snapshot_create(bs->file, sn_info); | |
2003 | return -ENOTSUP; | |
2004 | } | |
2005 | ||
2006 | int bdrv_snapshot_goto(BlockDriverState *bs, | |
2007 | const char *snapshot_id) | |
2008 | { | |
2009 | BlockDriver *drv = bs->drv; | |
2010 | int ret, open_ret; | |
2011 | ||
2012 | if (!drv) | |
2013 | return -ENOMEDIUM; | |
2014 | if (drv->bdrv_snapshot_goto) | |
2015 | return drv->bdrv_snapshot_goto(bs, snapshot_id); | |
2016 | ||
2017 | if (bs->file) { | |
2018 | drv->bdrv_close(bs); | |
2019 | ret = bdrv_snapshot_goto(bs->file, snapshot_id); | |
2020 | open_ret = drv->bdrv_open(bs, bs->open_flags); | |
2021 | if (open_ret < 0) { | |
2022 | bdrv_delete(bs->file); | |
2023 | bs->drv = NULL; | |
2024 | return open_ret; | |
2025 | } | |
2026 | return ret; | |
2027 | } | |
2028 | ||
2029 | return -ENOTSUP; | |
2030 | } | |
2031 | ||
2032 | int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) | |
2033 | { | |
2034 | BlockDriver *drv = bs->drv; | |
2035 | if (!drv) | |
2036 | return -ENOMEDIUM; | |
2037 | if (drv->bdrv_snapshot_delete) | |
2038 | return drv->bdrv_snapshot_delete(bs, snapshot_id); | |
2039 | if (bs->file) | |
2040 | return bdrv_snapshot_delete(bs->file, snapshot_id); | |
2041 | return -ENOTSUP; | |
2042 | } | |
2043 | ||
2044 | int bdrv_snapshot_list(BlockDriverState *bs, | |
2045 | QEMUSnapshotInfo **psn_info) | |
2046 | { | |
2047 | BlockDriver *drv = bs->drv; | |
2048 | if (!drv) | |
2049 | return -ENOMEDIUM; | |
2050 | if (drv->bdrv_snapshot_list) | |
2051 | return drv->bdrv_snapshot_list(bs, psn_info); | |
2052 | if (bs->file) | |
2053 | return bdrv_snapshot_list(bs->file, psn_info); | |
2054 | return -ENOTSUP; | |
2055 | } | |
2056 | ||
2057 | int bdrv_snapshot_load_tmp(BlockDriverState *bs, | |
2058 | const char *snapshot_name) | |
2059 | { | |
2060 | BlockDriver *drv = bs->drv; | |
2061 | if (!drv) { | |
2062 | return -ENOMEDIUM; | |
2063 | } | |
2064 | if (!bs->read_only) { | |
2065 | return -EINVAL; | |
2066 | } | |
2067 | if (drv->bdrv_snapshot_load_tmp) { | |
2068 | return drv->bdrv_snapshot_load_tmp(bs, snapshot_name); | |
2069 | } | |
2070 | return -ENOTSUP; | |
2071 | } | |
2072 | ||
2073 | #define NB_SUFFIXES 4 | |
2074 | ||
2075 | char *get_human_readable_size(char *buf, int buf_size, int64_t size) | |
2076 | { | |
2077 | static const char suffixes[NB_SUFFIXES] = "KMGT"; | |
2078 | int64_t base; | |
2079 | int i; | |
2080 | ||
2081 | if (size <= 999) { | |
2082 | snprintf(buf, buf_size, "%" PRId64, size); | |
2083 | } else { | |
2084 | base = 1024; | |
2085 | for(i = 0; i < NB_SUFFIXES; i++) { | |
2086 | if (size < (10 * base)) { | |
2087 | snprintf(buf, buf_size, "%0.1f%c", | |
2088 | (double)size / base, | |
2089 | suffixes[i]); | |
2090 | break; | |
2091 | } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { | |
2092 | snprintf(buf, buf_size, "%" PRId64 "%c", | |
2093 | ((size + (base >> 1)) / base), | |
2094 | suffixes[i]); | |
2095 | break; | |
2096 | } | |
2097 | base = base * 1024; | |
2098 | } | |
2099 | } | |
2100 | return buf; | |
2101 | } | |
2102 | ||
2103 | char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) | |
2104 | { | |
2105 | char buf1[128], date_buf[128], clock_buf[128]; | |
2106 | #ifdef _WIN32 | |
2107 | struct tm *ptm; | |
2108 | #else | |
2109 | struct tm tm; | |
2110 | #endif | |
2111 | time_t ti; | |
2112 | int64_t secs; | |
2113 | ||
2114 | if (!sn) { | |
2115 | snprintf(buf, buf_size, | |
2116 | "%-10s%-20s%7s%20s%15s", | |
2117 | "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); | |
2118 | } else { | |
2119 | ti = sn->date_sec; | |
2120 | #ifdef _WIN32 | |
2121 | ptm = localtime(&ti); | |
2122 | strftime(date_buf, sizeof(date_buf), | |
2123 | "%Y-%m-%d %H:%M:%S", ptm); | |
2124 | #else | |
2125 | localtime_r(&ti, &tm); | |
2126 | strftime(date_buf, sizeof(date_buf), | |
2127 | "%Y-%m-%d %H:%M:%S", &tm); | |
2128 | #endif | |
2129 | secs = sn->vm_clock_nsec / 1000000000; | |
2130 | snprintf(clock_buf, sizeof(clock_buf), | |
2131 | "%02d:%02d:%02d.%03d", | |
2132 | (int)(secs / 3600), | |
2133 | (int)((secs / 60) % 60), | |
2134 | (int)(secs % 60), | |
2135 | (int)((sn->vm_clock_nsec / 1000000) % 1000)); | |
2136 | snprintf(buf, buf_size, | |
2137 | "%-10s%-20s%7s%20s%15s", | |
2138 | sn->id_str, sn->name, | |
2139 | get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), | |
2140 | date_buf, | |
2141 | clock_buf); | |
2142 | } | |
2143 | return buf; | |
2144 | } | |
2145 | ||
2146 | ||
2147 | /**************************************************************/ | |
2148 | /* async I/Os */ | |
2149 | ||
2150 | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, | |
2151 | QEMUIOVector *qiov, int nb_sectors, | |
2152 | BlockDriverCompletionFunc *cb, void *opaque) | |
2153 | { | |
2154 | BlockDriver *drv = bs->drv; | |
2155 | BlockDriverAIOCB *ret; | |
2156 | ||
2157 | trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque); | |
2158 | ||
2159 | if (!drv) | |
2160 | return NULL; | |
2161 | if (bdrv_check_request(bs, sector_num, nb_sectors)) | |
2162 | return NULL; | |
2163 | ||
2164 | ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors, | |
2165 | cb, opaque); | |
2166 | ||
2167 | if (ret) { | |
2168 | /* Update stats even though technically transfer has not happened. */ | |
2169 | bs->rd_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE; | |
2170 | bs->rd_ops ++; | |
2171 | } | |
2172 | ||
2173 | return ret; | |
2174 | } | |
2175 | ||
2176 | typedef struct BlockCompleteData { | |
2177 | BlockDriverCompletionFunc *cb; | |
2178 | void *opaque; | |
2179 | BlockDriverState *bs; | |
2180 | int64_t sector_num; | |
2181 | int nb_sectors; | |
2182 | } BlockCompleteData; | |
2183 | ||
2184 | static void block_complete_cb(void *opaque, int ret) | |
2185 | { | |
2186 | BlockCompleteData *b = opaque; | |
2187 | ||
2188 | if (b->bs->dirty_bitmap) { | |
2189 | set_dirty_bitmap(b->bs, b->sector_num, b->nb_sectors, 1); | |
2190 | } | |
2191 | b->cb(b->opaque, ret); | |
2192 | qemu_free(b); | |
2193 | } | |
2194 | ||
2195 | static BlockCompleteData *blk_dirty_cb_alloc(BlockDriverState *bs, | |
2196 | int64_t sector_num, | |
2197 | int nb_sectors, | |
2198 | BlockDriverCompletionFunc *cb, | |
2199 | void *opaque) | |
2200 | { | |
2201 | BlockCompleteData *blkdata = qemu_mallocz(sizeof(BlockCompleteData)); | |
2202 | ||
2203 | blkdata->bs = bs; | |
2204 | blkdata->cb = cb; | |
2205 | blkdata->opaque = opaque; | |
2206 | blkdata->sector_num = sector_num; | |
2207 | blkdata->nb_sectors = nb_sectors; | |
2208 | ||
2209 | return blkdata; | |
2210 | } | |
2211 | ||
2212 | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, | |
2213 | QEMUIOVector *qiov, int nb_sectors, | |
2214 | BlockDriverCompletionFunc *cb, void *opaque) | |
2215 | { | |
2216 | BlockDriver *drv = bs->drv; | |
2217 | BlockDriverAIOCB *ret; | |
2218 | BlockCompleteData *blk_cb_data; | |
2219 | ||
2220 | trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque); | |
2221 | ||
2222 | if (!drv) | |
2223 | return NULL; | |
2224 | if (bs->read_only) | |
2225 | return NULL; | |
2226 | if (bdrv_check_request(bs, sector_num, nb_sectors)) | |
2227 | return NULL; | |
2228 | ||
2229 | if (bs->dirty_bitmap) { | |
2230 | blk_cb_data = blk_dirty_cb_alloc(bs, sector_num, nb_sectors, cb, | |
2231 | opaque); | |
2232 | cb = &block_complete_cb; | |
2233 | opaque = blk_cb_data; | |
2234 | } | |
2235 | ||
2236 | ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors, | |
2237 | cb, opaque); | |
2238 | ||
2239 | if (ret) { | |
2240 | /* Update stats even though technically transfer has not happened. */ | |
2241 | bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE; | |
2242 | bs->wr_ops ++; | |
2243 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { | |
2244 | bs->wr_highest_sector = sector_num + nb_sectors - 1; | |
2245 | } | |
2246 | } | |
2247 | ||
2248 | return ret; | |
2249 | } | |
2250 | ||
2251 | ||
2252 | typedef struct MultiwriteCB { | |
2253 | int error; | |
2254 | int num_requests; | |
2255 | int num_callbacks; | |
2256 | struct { | |
2257 | BlockDriverCompletionFunc *cb; | |
2258 | void *opaque; | |
2259 | QEMUIOVector *free_qiov; | |
2260 | void *free_buf; | |
2261 | } callbacks[]; | |
2262 | } MultiwriteCB; | |
2263 | ||
2264 | static void multiwrite_user_cb(MultiwriteCB *mcb) | |
2265 | { | |
2266 | int i; | |
2267 | ||
2268 | for (i = 0; i < mcb->num_callbacks; i++) { | |
2269 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); | |
2270 | if (mcb->callbacks[i].free_qiov) { | |
2271 | qemu_iovec_destroy(mcb->callbacks[i].free_qiov); | |
2272 | } | |
2273 | qemu_free(mcb->callbacks[i].free_qiov); | |
2274 | qemu_vfree(mcb->callbacks[i].free_buf); | |
2275 | } | |
2276 | } | |
2277 | ||
2278 | static void multiwrite_cb(void *opaque, int ret) | |
2279 | { | |
2280 | MultiwriteCB *mcb = opaque; | |
2281 | ||
2282 | trace_multiwrite_cb(mcb, ret); | |
2283 | ||
2284 | if (ret < 0 && !mcb->error) { | |
2285 | mcb->error = ret; | |
2286 | } | |
2287 | ||
2288 | mcb->num_requests--; | |
2289 | if (mcb->num_requests == 0) { | |
2290 | multiwrite_user_cb(mcb); | |
2291 | qemu_free(mcb); | |
2292 | } | |
2293 | } | |
2294 | ||
2295 | static int multiwrite_req_compare(const void *a, const void *b) | |
2296 | { | |
2297 | const BlockRequest *req1 = a, *req2 = b; | |
2298 | ||
2299 | /* | |
2300 | * Note that we can't simply subtract req2->sector from req1->sector | |
2301 | * here as that could overflow the return value. | |
2302 | */ | |
2303 | if (req1->sector > req2->sector) { | |
2304 | return 1; | |
2305 | } else if (req1->sector < req2->sector) { | |
2306 | return -1; | |
2307 | } else { | |
2308 | return 0; | |
2309 | } | |
2310 | } | |
2311 | ||
2312 | /* | |
2313 | * Takes a bunch of requests and tries to merge them. Returns the number of | |
2314 | * requests that remain after merging. | |
2315 | */ | |
2316 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, | |
2317 | int num_reqs, MultiwriteCB *mcb) | |
2318 | { | |
2319 | int i, outidx; | |
2320 | ||
2321 | // Sort requests by start sector | |
2322 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); | |
2323 | ||
2324 | // Check if adjacent requests touch the same clusters. If so, combine them, | |
2325 | // filling up gaps with zero sectors. | |
2326 | outidx = 0; | |
2327 | for (i = 1; i < num_reqs; i++) { | |
2328 | int merge = 0; | |
2329 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; | |
2330 | ||
2331 | // This handles the cases that are valid for all block drivers, namely | |
2332 | // exactly sequential writes and overlapping writes. | |
2333 | if (reqs[i].sector <= oldreq_last) { | |
2334 | merge = 1; | |
2335 | } | |
2336 | ||
2337 | // The block driver may decide that it makes sense to combine requests | |
2338 | // even if there is a gap of some sectors between them. In this case, | |
2339 | // the gap is filled with zeros (therefore only applicable for yet | |
2340 | // unused space in format like qcow2). | |
2341 | if (!merge && bs->drv->bdrv_merge_requests) { | |
2342 | merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]); | |
2343 | } | |
2344 | ||
2345 | if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { | |
2346 | merge = 0; | |
2347 | } | |
2348 | ||
2349 | if (merge) { | |
2350 | size_t size; | |
2351 | QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov)); | |
2352 | qemu_iovec_init(qiov, | |
2353 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); | |
2354 | ||
2355 | // Add the first request to the merged one. If the requests are | |
2356 | // overlapping, drop the last sectors of the first request. | |
2357 | size = (reqs[i].sector - reqs[outidx].sector) << 9; | |
2358 | qemu_iovec_concat(qiov, reqs[outidx].qiov, size); | |
2359 | ||
2360 | // We might need to add some zeros between the two requests | |
2361 | if (reqs[i].sector > oldreq_last) { | |
2362 | size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9; | |
2363 | uint8_t *buf = qemu_blockalign(bs, zero_bytes); | |
2364 | memset(buf, 0, zero_bytes); | |
2365 | qemu_iovec_add(qiov, buf, zero_bytes); | |
2366 | mcb->callbacks[i].free_buf = buf; | |
2367 | } | |
2368 | ||
2369 | // Add the second request | |
2370 | qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size); | |
2371 | ||
2372 | reqs[outidx].nb_sectors = qiov->size >> 9; | |
2373 | reqs[outidx].qiov = qiov; | |
2374 | ||
2375 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; | |
2376 | } else { | |
2377 | outidx++; | |
2378 | reqs[outidx].sector = reqs[i].sector; | |
2379 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; | |
2380 | reqs[outidx].qiov = reqs[i].qiov; | |
2381 | } | |
2382 | } | |
2383 | ||
2384 | return outidx + 1; | |
2385 | } | |
2386 | ||
2387 | /* | |
2388 | * Submit multiple AIO write requests at once. | |
2389 | * | |
2390 | * On success, the function returns 0 and all requests in the reqs array have | |
2391 | * been submitted. In error case this function returns -1, and any of the | |
2392 | * requests may or may not be submitted yet. In particular, this means that the | |
2393 | * callback will be called for some of the requests, for others it won't. The | |
2394 | * caller must check the error field of the BlockRequest to wait for the right | |
2395 | * callbacks (if error != 0, no callback will be called). | |
2396 | * | |
2397 | * The implementation may modify the contents of the reqs array, e.g. to merge | |
2398 | * requests. However, the fields opaque and error are left unmodified as they | |
2399 | * are used to signal failure for a single request to the caller. | |
2400 | */ | |
2401 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) | |
2402 | { | |
2403 | BlockDriverAIOCB *acb; | |
2404 | MultiwriteCB *mcb; | |
2405 | int i; | |
2406 | ||
2407 | /* don't submit writes if we don't have a medium */ | |
2408 | if (bs->drv == NULL) { | |
2409 | for (i = 0; i < num_reqs; i++) { | |
2410 | reqs[i].error = -ENOMEDIUM; | |
2411 | } | |
2412 | return -1; | |
2413 | } | |
2414 | ||
2415 | if (num_reqs == 0) { | |
2416 | return 0; | |
2417 | } | |
2418 | ||
2419 | // Create MultiwriteCB structure | |
2420 | mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); | |
2421 | mcb->num_requests = 0; | |
2422 | mcb->num_callbacks = num_reqs; | |
2423 | ||
2424 | for (i = 0; i < num_reqs; i++) { | |
2425 | mcb->callbacks[i].cb = reqs[i].cb; | |
2426 | mcb->callbacks[i].opaque = reqs[i].opaque; | |
2427 | } | |
2428 | ||
2429 | // Check for mergable requests | |
2430 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); | |
2431 | ||
2432 | trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs); | |
2433 | ||
2434 | /* | |
2435 | * Run the aio requests. As soon as one request can't be submitted | |
2436 | * successfully, fail all requests that are not yet submitted (we must | |
2437 | * return failure for all requests anyway) | |
2438 | * | |
2439 | * num_requests cannot be set to the right value immediately: If | |
2440 | * bdrv_aio_writev fails for some request, num_requests would be too high | |
2441 | * and therefore multiwrite_cb() would never recognize the multiwrite | |
2442 | * request as completed. We also cannot use the loop variable i to set it | |
2443 | * when the first request fails because the callback may already have been | |
2444 | * called for previously submitted requests. Thus, num_requests must be | |
2445 | * incremented for each request that is submitted. | |
2446 | * | |
2447 | * The problem that callbacks may be called early also means that we need | |
2448 | * to take care that num_requests doesn't become 0 before all requests are | |
2449 | * submitted - multiwrite_cb() would consider the multiwrite request | |
2450 | * completed. A dummy request that is "completed" by a manual call to | |
2451 | * multiwrite_cb() takes care of this. | |
2452 | */ | |
2453 | mcb->num_requests = 1; | |
2454 | ||
2455 | // Run the aio requests | |
2456 | for (i = 0; i < num_reqs; i++) { | |
2457 | mcb->num_requests++; | |
2458 | acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, | |
2459 | reqs[i].nb_sectors, multiwrite_cb, mcb); | |
2460 | ||
2461 | if (acb == NULL) { | |
2462 | // We can only fail the whole thing if no request has been | |
2463 | // submitted yet. Otherwise we'll wait for the submitted AIOs to | |
2464 | // complete and report the error in the callback. | |
2465 | if (i == 0) { | |
2466 | trace_bdrv_aio_multiwrite_earlyfail(mcb); | |
2467 | goto fail; | |
2468 | } else { | |
2469 | trace_bdrv_aio_multiwrite_latefail(mcb, i); | |
2470 | multiwrite_cb(mcb, -EIO); | |
2471 | break; | |
2472 | } | |
2473 | } | |
2474 | } | |
2475 | ||
2476 | /* Complete the dummy request */ | |
2477 | multiwrite_cb(mcb, 0); | |
2478 | ||
2479 | return 0; | |
2480 | ||
2481 | fail: | |
2482 | for (i = 0; i < mcb->num_callbacks; i++) { | |
2483 | reqs[i].error = -EIO; | |
2484 | } | |
2485 | qemu_free(mcb); | |
2486 | return -1; | |
2487 | } | |
2488 | ||
2489 | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, | |
2490 | BlockDriverCompletionFunc *cb, void *opaque) | |
2491 | { | |
2492 | BlockDriver *drv = bs->drv; | |
2493 | ||
2494 | trace_bdrv_aio_flush(bs, opaque); | |
2495 | ||
2496 | if (bs->open_flags & BDRV_O_NO_FLUSH) { | |
2497 | return bdrv_aio_noop_em(bs, cb, opaque); | |
2498 | } | |
2499 | ||
2500 | if (!drv) | |
2501 | return NULL; | |
2502 | return drv->bdrv_aio_flush(bs, cb, opaque); | |
2503 | } | |
2504 | ||
2505 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) | |
2506 | { | |
2507 | acb->pool->cancel(acb); | |
2508 | } | |
2509 | ||
2510 | ||
2511 | /**************************************************************/ | |
2512 | /* async block device emulation */ | |
2513 | ||
2514 | typedef struct BlockDriverAIOCBSync { | |
2515 | BlockDriverAIOCB common; | |
2516 | QEMUBH *bh; | |
2517 | int ret; | |
2518 | /* vector translation state */ | |
2519 | QEMUIOVector *qiov; | |
2520 | uint8_t *bounce; | |
2521 | int is_write; | |
2522 | } BlockDriverAIOCBSync; | |
2523 | ||
2524 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) | |
2525 | { | |
2526 | BlockDriverAIOCBSync *acb = | |
2527 | container_of(blockacb, BlockDriverAIOCBSync, common); | |
2528 | qemu_bh_delete(acb->bh); | |
2529 | acb->bh = NULL; | |
2530 | qemu_aio_release(acb); | |
2531 | } | |
2532 | ||
2533 | static AIOPool bdrv_em_aio_pool = { | |
2534 | .aiocb_size = sizeof(BlockDriverAIOCBSync), | |
2535 | .cancel = bdrv_aio_cancel_em, | |
2536 | }; | |
2537 | ||
2538 | static void bdrv_aio_bh_cb(void *opaque) | |
2539 | { | |
2540 | BlockDriverAIOCBSync *acb = opaque; | |
2541 | ||
2542 | if (!acb->is_write) | |
2543 | qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); | |
2544 | qemu_vfree(acb->bounce); | |
2545 | acb->common.cb(acb->common.opaque, acb->ret); | |
2546 | qemu_bh_delete(acb->bh); | |
2547 | acb->bh = NULL; | |
2548 | qemu_aio_release(acb); | |
2549 | } | |
2550 | ||
2551 | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, | |
2552 | int64_t sector_num, | |
2553 | QEMUIOVector *qiov, | |
2554 | int nb_sectors, | |
2555 | BlockDriverCompletionFunc *cb, | |
2556 | void *opaque, | |
2557 | int is_write) | |
2558 | ||
2559 | { | |
2560 | BlockDriverAIOCBSync *acb; | |
2561 | ||
2562 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); | |
2563 | acb->is_write = is_write; | |
2564 | acb->qiov = qiov; | |
2565 | acb->bounce = qemu_blockalign(bs, qiov->size); | |
2566 | ||
2567 | if (!acb->bh) | |
2568 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
2569 | ||
2570 | if (is_write) { | |
2571 | qemu_iovec_to_buffer(acb->qiov, acb->bounce); | |
2572 | acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors); | |
2573 | } else { | |
2574 | acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors); | |
2575 | } | |
2576 | ||
2577 | qemu_bh_schedule(acb->bh); | |
2578 | ||
2579 | return &acb->common; | |
2580 | } | |
2581 | ||
2582 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, | |
2583 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
2584 | BlockDriverCompletionFunc *cb, void *opaque) | |
2585 | { | |
2586 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); | |
2587 | } | |
2588 | ||
2589 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, | |
2590 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
2591 | BlockDriverCompletionFunc *cb, void *opaque) | |
2592 | { | |
2593 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); | |
2594 | } | |
2595 | ||
2596 | static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, | |
2597 | BlockDriverCompletionFunc *cb, void *opaque) | |
2598 | { | |
2599 | BlockDriverAIOCBSync *acb; | |
2600 | ||
2601 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); | |
2602 | acb->is_write = 1; /* don't bounce in the completion hadler */ | |
2603 | acb->qiov = NULL; | |
2604 | acb->bounce = NULL; | |
2605 | acb->ret = 0; | |
2606 | ||
2607 | if (!acb->bh) | |
2608 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
2609 | ||
2610 | bdrv_flush(bs); | |
2611 | qemu_bh_schedule(acb->bh); | |
2612 | return &acb->common; | |
2613 | } | |
2614 | ||
2615 | static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs, | |
2616 | BlockDriverCompletionFunc *cb, void *opaque) | |
2617 | { | |
2618 | BlockDriverAIOCBSync *acb; | |
2619 | ||
2620 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); | |
2621 | acb->is_write = 1; /* don't bounce in the completion handler */ | |
2622 | acb->qiov = NULL; | |
2623 | acb->bounce = NULL; | |
2624 | acb->ret = 0; | |
2625 | ||
2626 | if (!acb->bh) { | |
2627 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
2628 | } | |
2629 | ||
2630 | qemu_bh_schedule(acb->bh); | |
2631 | return &acb->common; | |
2632 | } | |
2633 | ||
2634 | /**************************************************************/ | |
2635 | /* sync block device emulation */ | |
2636 | ||
2637 | static void bdrv_rw_em_cb(void *opaque, int ret) | |
2638 | { | |
2639 | *(int *)opaque = ret; | |
2640 | } | |
2641 | ||
2642 | #define NOT_DONE 0x7fffffff | |
2643 | ||
2644 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, | |
2645 | uint8_t *buf, int nb_sectors) | |
2646 | { | |
2647 | int async_ret; | |
2648 | BlockDriverAIOCB *acb; | |
2649 | struct iovec iov; | |
2650 | QEMUIOVector qiov; | |
2651 | ||
2652 | async_context_push(); | |
2653 | ||
2654 | async_ret = NOT_DONE; | |
2655 | iov.iov_base = (void *)buf; | |
2656 | iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE; | |
2657 | qemu_iovec_init_external(&qiov, &iov, 1); | |
2658 | acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors, | |
2659 | bdrv_rw_em_cb, &async_ret); | |
2660 | if (acb == NULL) { | |
2661 | async_ret = -1; | |
2662 | goto fail; | |
2663 | } | |
2664 | ||
2665 | while (async_ret == NOT_DONE) { | |
2666 | qemu_aio_wait(); | |
2667 | } | |
2668 | ||
2669 | ||
2670 | fail: | |
2671 | async_context_pop(); | |
2672 | return async_ret; | |
2673 | } | |
2674 | ||
2675 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, | |
2676 | const uint8_t *buf, int nb_sectors) | |
2677 | { | |
2678 | int async_ret; | |
2679 | BlockDriverAIOCB *acb; | |
2680 | struct iovec iov; | |
2681 | QEMUIOVector qiov; | |
2682 | ||
2683 | async_context_push(); | |
2684 | ||
2685 | async_ret = NOT_DONE; | |
2686 | iov.iov_base = (void *)buf; | |
2687 | iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE; | |
2688 | qemu_iovec_init_external(&qiov, &iov, 1); | |
2689 | acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors, | |
2690 | bdrv_rw_em_cb, &async_ret); | |
2691 | if (acb == NULL) { | |
2692 | async_ret = -1; | |
2693 | goto fail; | |
2694 | } | |
2695 | while (async_ret == NOT_DONE) { | |
2696 | qemu_aio_wait(); | |
2697 | } | |
2698 | ||
2699 | fail: | |
2700 | async_context_pop(); | |
2701 | return async_ret; | |
2702 | } | |
2703 | ||
2704 | void bdrv_init(void) | |
2705 | { | |
2706 | module_call_init(MODULE_INIT_BLOCK); | |
2707 | } | |
2708 | ||
2709 | void bdrv_init_with_whitelist(void) | |
2710 | { | |
2711 | use_bdrv_whitelist = 1; | |
2712 | bdrv_init(); | |
2713 | } | |
2714 | ||
2715 | void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs, | |
2716 | BlockDriverCompletionFunc *cb, void *opaque) | |
2717 | { | |
2718 | BlockDriverAIOCB *acb; | |
2719 | ||
2720 | if (pool->free_aiocb) { | |
2721 | acb = pool->free_aiocb; | |
2722 | pool->free_aiocb = acb->next; | |
2723 | } else { | |
2724 | acb = qemu_mallocz(pool->aiocb_size); | |
2725 | acb->pool = pool; | |
2726 | } | |
2727 | acb->bs = bs; | |
2728 | acb->cb = cb; | |
2729 | acb->opaque = opaque; | |
2730 | return acb; | |
2731 | } | |
2732 | ||
2733 | void qemu_aio_release(void *p) | |
2734 | { | |
2735 | BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; | |
2736 | AIOPool *pool = acb->pool; | |
2737 | acb->next = pool->free_aiocb; | |
2738 | pool->free_aiocb = acb; | |
2739 | } | |
2740 | ||
2741 | /**************************************************************/ | |
2742 | /* removable device support */ | |
2743 | ||
2744 | /** | |
2745 | * Return TRUE if the media is present | |
2746 | */ | |
2747 | int bdrv_is_inserted(BlockDriverState *bs) | |
2748 | { | |
2749 | BlockDriver *drv = bs->drv; | |
2750 | int ret; | |
2751 | if (!drv) | |
2752 | return 0; | |
2753 | if (!drv->bdrv_is_inserted) | |
2754 | return !bs->tray_open; | |
2755 | ret = drv->bdrv_is_inserted(bs); | |
2756 | return ret; | |
2757 | } | |
2758 | ||
2759 | /** | |
2760 | * Return TRUE if the media changed since the last call to this | |
2761 | * function. It is currently only used for floppy disks | |
2762 | */ | |
2763 | int bdrv_media_changed(BlockDriverState *bs) | |
2764 | { | |
2765 | BlockDriver *drv = bs->drv; | |
2766 | int ret; | |
2767 | ||
2768 | if (!drv || !drv->bdrv_media_changed) | |
2769 | ret = -ENOTSUP; | |
2770 | else | |
2771 | ret = drv->bdrv_media_changed(bs); | |
2772 | if (ret == -ENOTSUP) | |
2773 | ret = bs->media_changed; | |
2774 | bs->media_changed = 0; | |
2775 | return ret; | |
2776 | } | |
2777 | ||
2778 | /** | |
2779 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
2780 | */ | |
2781 | int bdrv_eject(BlockDriverState *bs, int eject_flag) | |
2782 | { | |
2783 | BlockDriver *drv = bs->drv; | |
2784 | int ret; | |
2785 | ||
2786 | if (bs->locked) { | |
2787 | return -EBUSY; | |
2788 | } | |
2789 | ||
2790 | if (!drv || !drv->bdrv_eject) { | |
2791 | ret = -ENOTSUP; | |
2792 | } else { | |
2793 | ret = drv->bdrv_eject(bs, eject_flag); | |
2794 | } | |
2795 | if (ret == -ENOTSUP) { | |
2796 | ret = 0; | |
2797 | } | |
2798 | if (ret >= 0) { | |
2799 | bs->tray_open = eject_flag; | |
2800 | } | |
2801 | ||
2802 | return ret; | |
2803 | } | |
2804 | ||
2805 | int bdrv_is_locked(BlockDriverState *bs) | |
2806 | { | |
2807 | return bs->locked; | |
2808 | } | |
2809 | ||
2810 | /** | |
2811 | * Lock or unlock the media (if it is locked, the user won't be able | |
2812 | * to eject it manually). | |
2813 | */ | |
2814 | void bdrv_set_locked(BlockDriverState *bs, int locked) | |
2815 | { | |
2816 | BlockDriver *drv = bs->drv; | |
2817 | ||
2818 | trace_bdrv_set_locked(bs, locked); | |
2819 | ||
2820 | bs->locked = locked; | |
2821 | if (drv && drv->bdrv_set_locked) { | |
2822 | drv->bdrv_set_locked(bs, locked); | |
2823 | } | |
2824 | } | |
2825 | ||
2826 | /* needed for generic scsi interface */ | |
2827 | ||
2828 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
2829 | { | |
2830 | BlockDriver *drv = bs->drv; | |
2831 | ||
2832 | if (drv && drv->bdrv_ioctl) | |
2833 | return drv->bdrv_ioctl(bs, req, buf); | |
2834 | return -ENOTSUP; | |
2835 | } | |
2836 | ||
2837 | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, | |
2838 | unsigned long int req, void *buf, | |
2839 | BlockDriverCompletionFunc *cb, void *opaque) | |
2840 | { | |
2841 | BlockDriver *drv = bs->drv; | |
2842 | ||
2843 | if (drv && drv->bdrv_aio_ioctl) | |
2844 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); | |
2845 | return NULL; | |
2846 | } | |
2847 | ||
2848 | ||
2849 | ||
2850 | void *qemu_blockalign(BlockDriverState *bs, size_t size) | |
2851 | { | |
2852 | return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); | |
2853 | } | |
2854 | ||
2855 | void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable) | |
2856 | { | |
2857 | int64_t bitmap_size; | |
2858 | ||
2859 | bs->dirty_count = 0; | |
2860 | if (enable) { | |
2861 | if (!bs->dirty_bitmap) { | |
2862 | bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) + | |
2863 | BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1; | |
2864 | bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8; | |
2865 | ||
2866 | bs->dirty_bitmap = qemu_mallocz(bitmap_size); | |
2867 | } | |
2868 | } else { | |
2869 | if (bs->dirty_bitmap) { | |
2870 | qemu_free(bs->dirty_bitmap); | |
2871 | bs->dirty_bitmap = NULL; | |
2872 | } | |
2873 | } | |
2874 | } | |
2875 | ||
2876 | int bdrv_get_dirty(BlockDriverState *bs, int64_t sector) | |
2877 | { | |
2878 | int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; | |
2879 | ||
2880 | if (bs->dirty_bitmap && | |
2881 | (sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) { | |
2882 | return !!(bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] & | |
2883 | (1UL << (chunk % (sizeof(unsigned long) * 8)))); | |
2884 | } else { | |
2885 | return 0; | |
2886 | } | |
2887 | } | |
2888 | ||
2889 | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, | |
2890 | int nr_sectors) | |
2891 | { | |
2892 | set_dirty_bitmap(bs, cur_sector, nr_sectors, 0); | |
2893 | } | |
2894 | ||
2895 | int64_t bdrv_get_dirty_count(BlockDriverState *bs) | |
2896 | { | |
2897 | return bs->dirty_count; | |
2898 | } | |
2899 | ||
2900 | void bdrv_set_in_use(BlockDriverState *bs, int in_use) | |
2901 | { | |
2902 | assert(bs->in_use != in_use); | |
2903 | bs->in_use = in_use; | |
2904 | } | |
2905 | ||
2906 | int bdrv_in_use(BlockDriverState *bs) | |
2907 | { | |
2908 | return bs->in_use; | |
2909 | } | |
2910 | ||
2911 | int bdrv_img_create(const char *filename, const char *fmt, | |
2912 | const char *base_filename, const char *base_fmt, | |
2913 | char *options, uint64_t img_size, int flags) | |
2914 | { | |
2915 | QEMUOptionParameter *param = NULL, *create_options = NULL; | |
2916 | QEMUOptionParameter *backing_fmt, *backing_file; | |
2917 | BlockDriverState *bs = NULL; | |
2918 | BlockDriver *drv, *proto_drv; | |
2919 | BlockDriver *backing_drv = NULL; | |
2920 | int ret = 0; | |
2921 | ||
2922 | /* Find driver and parse its options */ | |
2923 | drv = bdrv_find_format(fmt); | |
2924 | if (!drv) { | |
2925 | error_report("Unknown file format '%s'", fmt); | |
2926 | ret = -EINVAL; | |
2927 | goto out; | |
2928 | } | |
2929 | ||
2930 | proto_drv = bdrv_find_protocol(filename); | |
2931 | if (!proto_drv) { | |
2932 | error_report("Unknown protocol '%s'", filename); | |
2933 | ret = -EINVAL; | |
2934 | goto out; | |
2935 | } | |
2936 | ||
2937 | create_options = append_option_parameters(create_options, | |
2938 | drv->create_options); | |
2939 | create_options = append_option_parameters(create_options, | |
2940 | proto_drv->create_options); | |
2941 | ||
2942 | /* Create parameter list with default values */ | |
2943 | param = parse_option_parameters("", create_options, param); | |
2944 | ||
2945 | set_option_parameter_int(param, BLOCK_OPT_SIZE, img_size); | |
2946 | ||
2947 | /* Parse -o options */ | |
2948 | if (options) { | |
2949 | param = parse_option_parameters(options, create_options, param); | |
2950 | if (param == NULL) { | |
2951 | error_report("Invalid options for file format '%s'.", fmt); | |
2952 | ret = -EINVAL; | |
2953 | goto out; | |
2954 | } | |
2955 | } | |
2956 | ||
2957 | if (base_filename) { | |
2958 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FILE, | |
2959 | base_filename)) { | |
2960 | error_report("Backing file not supported for file format '%s'", | |
2961 | fmt); | |
2962 | ret = -EINVAL; | |
2963 | goto out; | |
2964 | } | |
2965 | } | |
2966 | ||
2967 | if (base_fmt) { | |
2968 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FMT, base_fmt)) { | |
2969 | error_report("Backing file format not supported for file " | |
2970 | "format '%s'", fmt); | |
2971 | ret = -EINVAL; | |
2972 | goto out; | |
2973 | } | |
2974 | } | |
2975 | ||
2976 | backing_file = get_option_parameter(param, BLOCK_OPT_BACKING_FILE); | |
2977 | if (backing_file && backing_file->value.s) { | |
2978 | if (!strcmp(filename, backing_file->value.s)) { | |
2979 | error_report("Error: Trying to create an image with the " | |
2980 | "same filename as the backing file"); | |
2981 | ret = -EINVAL; | |
2982 | goto out; | |
2983 | } | |
2984 | } | |
2985 | ||
2986 | backing_fmt = get_option_parameter(param, BLOCK_OPT_BACKING_FMT); | |
2987 | if (backing_fmt && backing_fmt->value.s) { | |
2988 | backing_drv = bdrv_find_format(backing_fmt->value.s); | |
2989 | if (!backing_drv) { | |
2990 | error_report("Unknown backing file format '%s'", | |
2991 | backing_fmt->value.s); | |
2992 | ret = -EINVAL; | |
2993 | goto out; | |
2994 | } | |
2995 | } | |
2996 | ||
2997 | // The size for the image must always be specified, with one exception: | |
2998 | // If we are using a backing file, we can obtain the size from there | |
2999 | if (get_option_parameter(param, BLOCK_OPT_SIZE)->value.n == -1) { | |
3000 | if (backing_file && backing_file->value.s) { | |
3001 | uint64_t size; | |
3002 | char buf[32]; | |
3003 | ||
3004 | bs = bdrv_new(""); | |
3005 | ||
3006 | ret = bdrv_open(bs, backing_file->value.s, flags, backing_drv); | |
3007 | if (ret < 0) { | |
3008 | error_report("Could not open '%s'", backing_file->value.s); | |
3009 | goto out; | |
3010 | } | |
3011 | bdrv_get_geometry(bs, &size); | |
3012 | size *= 512; | |
3013 | ||
3014 | snprintf(buf, sizeof(buf), "%" PRId64, size); | |
3015 | set_option_parameter(param, BLOCK_OPT_SIZE, buf); | |
3016 | } else { | |
3017 | error_report("Image creation needs a size parameter"); | |
3018 | ret = -EINVAL; | |
3019 | goto out; | |
3020 | } | |
3021 | } | |
3022 | ||
3023 | printf("Formatting '%s', fmt=%s ", filename, fmt); | |
3024 | print_option_parameters(param); | |
3025 | puts(""); | |
3026 | ||
3027 | ret = bdrv_create(drv, filename, param); | |
3028 | ||
3029 | if (ret < 0) { | |
3030 | if (ret == -ENOTSUP) { | |
3031 | error_report("Formatting or formatting option not supported for " | |
3032 | "file format '%s'", fmt); | |
3033 | } else if (ret == -EFBIG) { | |
3034 | error_report("The image size is too large for file format '%s'", | |
3035 | fmt); | |
3036 | } else { | |
3037 | error_report("%s: error while creating %s: %s", filename, fmt, | |
3038 | strerror(-ret)); | |
3039 | } | |
3040 | } | |
3041 | ||
3042 | out: | |
3043 | free_option_parameters(create_options); | |
3044 | free_option_parameters(param); | |
3045 | ||
3046 | if (bs) { | |
3047 | bdrv_delete(bs); | |
3048 | } | |
3049 | ||
3050 | return ret; | |
3051 | } |