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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 | #include "qemu-coroutine.h" | |
32 | ||
33 | #ifdef CONFIG_BSD | |
34 | #include <sys/types.h> | |
35 | #include <sys/stat.h> | |
36 | #include <sys/ioctl.h> | |
37 | #include <sys/queue.h> | |
38 | #ifndef __DragonFly__ | |
39 | #include <sys/disk.h> | |
40 | #endif | |
41 | #endif | |
42 | ||
43 | #ifdef _WIN32 | |
44 | #include <windows.h> | |
45 | #endif | |
46 | ||
47 | static void bdrv_dev_change_cb(BlockDriverState *bs, int reason); | |
48 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, | |
49 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
50 | BlockDriverCompletionFunc *cb, void *opaque); | |
51 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, | |
52 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
53 | BlockDriverCompletionFunc *cb, void *opaque); | |
54 | static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, | |
55 | BlockDriverCompletionFunc *cb, void *opaque); | |
56 | static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs, | |
57 | BlockDriverCompletionFunc *cb, void *opaque); | |
58 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, | |
59 | uint8_t *buf, int nb_sectors); | |
60 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, | |
61 | const uint8_t *buf, int nb_sectors); | |
62 | static BlockDriverAIOCB *bdrv_co_aio_readv_em(BlockDriverState *bs, | |
63 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
64 | BlockDriverCompletionFunc *cb, void *opaque); | |
65 | static BlockDriverAIOCB *bdrv_co_aio_writev_em(BlockDriverState *bs, | |
66 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
67 | BlockDriverCompletionFunc *cb, void *opaque); | |
68 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, | |
69 | int64_t sector_num, int nb_sectors, | |
70 | QEMUIOVector *iov); | |
71 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
72 | int64_t sector_num, int nb_sectors, | |
73 | QEMUIOVector *iov); | |
74 | static int coroutine_fn bdrv_co_flush_em(BlockDriverState *bs); | |
75 | ||
76 | static QTAILQ_HEAD(, BlockDriverState) bdrv_states = | |
77 | QTAILQ_HEAD_INITIALIZER(bdrv_states); | |
78 | ||
79 | static QLIST_HEAD(, BlockDriver) bdrv_drivers = | |
80 | QLIST_HEAD_INITIALIZER(bdrv_drivers); | |
81 | ||
82 | /* The device to use for VM snapshots */ | |
83 | static BlockDriverState *bs_snapshots; | |
84 | ||
85 | /* If non-zero, use only whitelisted block drivers */ | |
86 | static int use_bdrv_whitelist; | |
87 | ||
88 | #ifdef _WIN32 | |
89 | static int is_windows_drive_prefix(const char *filename) | |
90 | { | |
91 | return (((filename[0] >= 'a' && filename[0] <= 'z') || | |
92 | (filename[0] >= 'A' && filename[0] <= 'Z')) && | |
93 | filename[1] == ':'); | |
94 | } | |
95 | ||
96 | int is_windows_drive(const char *filename) | |
97 | { | |
98 | if (is_windows_drive_prefix(filename) && | |
99 | filename[2] == '\0') | |
100 | return 1; | |
101 | if (strstart(filename, "\\\\.\\", NULL) || | |
102 | strstart(filename, "//./", NULL)) | |
103 | return 1; | |
104 | return 0; | |
105 | } | |
106 | #endif | |
107 | ||
108 | /* check if the path starts with "<protocol>:" */ | |
109 | static int path_has_protocol(const char *path) | |
110 | { | |
111 | #ifdef _WIN32 | |
112 | if (is_windows_drive(path) || | |
113 | is_windows_drive_prefix(path)) { | |
114 | return 0; | |
115 | } | |
116 | #endif | |
117 | ||
118 | return strchr(path, ':') != NULL; | |
119 | } | |
120 | ||
121 | int path_is_absolute(const char *path) | |
122 | { | |
123 | const char *p; | |
124 | #ifdef _WIN32 | |
125 | /* specific case for names like: "\\.\d:" */ | |
126 | if (*path == '/' || *path == '\\') | |
127 | return 1; | |
128 | #endif | |
129 | p = strchr(path, ':'); | |
130 | if (p) | |
131 | p++; | |
132 | else | |
133 | p = path; | |
134 | #ifdef _WIN32 | |
135 | return (*p == '/' || *p == '\\'); | |
136 | #else | |
137 | return (*p == '/'); | |
138 | #endif | |
139 | } | |
140 | ||
141 | /* if filename is absolute, just copy it to dest. Otherwise, build a | |
142 | path to it by considering it is relative to base_path. URL are | |
143 | supported. */ | |
144 | void path_combine(char *dest, int dest_size, | |
145 | const char *base_path, | |
146 | const char *filename) | |
147 | { | |
148 | const char *p, *p1; | |
149 | int len; | |
150 | ||
151 | if (dest_size <= 0) | |
152 | return; | |
153 | if (path_is_absolute(filename)) { | |
154 | pstrcpy(dest, dest_size, filename); | |
155 | } else { | |
156 | p = strchr(base_path, ':'); | |
157 | if (p) | |
158 | p++; | |
159 | else | |
160 | p = base_path; | |
161 | p1 = strrchr(base_path, '/'); | |
162 | #ifdef _WIN32 | |
163 | { | |
164 | const char *p2; | |
165 | p2 = strrchr(base_path, '\\'); | |
166 | if (!p1 || p2 > p1) | |
167 | p1 = p2; | |
168 | } | |
169 | #endif | |
170 | if (p1) | |
171 | p1++; | |
172 | else | |
173 | p1 = base_path; | |
174 | if (p1 > p) | |
175 | p = p1; | |
176 | len = p - base_path; | |
177 | if (len > dest_size - 1) | |
178 | len = dest_size - 1; | |
179 | memcpy(dest, base_path, len); | |
180 | dest[len] = '\0'; | |
181 | pstrcat(dest, dest_size, filename); | |
182 | } | |
183 | } | |
184 | ||
185 | void bdrv_register(BlockDriver *bdrv) | |
186 | { | |
187 | if (bdrv->bdrv_co_readv) { | |
188 | /* Emulate AIO by coroutines, and sync by AIO */ | |
189 | bdrv->bdrv_aio_readv = bdrv_co_aio_readv_em; | |
190 | bdrv->bdrv_aio_writev = bdrv_co_aio_writev_em; | |
191 | bdrv->bdrv_read = bdrv_read_em; | |
192 | bdrv->bdrv_write = bdrv_write_em; | |
193 | } else { | |
194 | bdrv->bdrv_co_readv = bdrv_co_readv_em; | |
195 | bdrv->bdrv_co_writev = bdrv_co_writev_em; | |
196 | ||
197 | if (!bdrv->bdrv_aio_readv) { | |
198 | /* add AIO emulation layer */ | |
199 | bdrv->bdrv_aio_readv = bdrv_aio_readv_em; | |
200 | bdrv->bdrv_aio_writev = bdrv_aio_writev_em; | |
201 | } else if (!bdrv->bdrv_read) { | |
202 | /* add synchronous IO emulation layer */ | |
203 | bdrv->bdrv_read = bdrv_read_em; | |
204 | bdrv->bdrv_write = bdrv_write_em; | |
205 | } | |
206 | } | |
207 | ||
208 | if (!bdrv->bdrv_aio_flush) | |
209 | bdrv->bdrv_aio_flush = bdrv_aio_flush_em; | |
210 | ||
211 | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); | |
212 | } | |
213 | ||
214 | /* create a new block device (by default it is empty) */ | |
215 | BlockDriverState *bdrv_new(const char *device_name) | |
216 | { | |
217 | BlockDriverState *bs; | |
218 | ||
219 | bs = g_malloc0(sizeof(BlockDriverState)); | |
220 | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name); | |
221 | if (device_name[0] != '\0') { | |
222 | QTAILQ_INSERT_TAIL(&bdrv_states, bs, list); | |
223 | } | |
224 | return bs; | |
225 | } | |
226 | ||
227 | BlockDriver *bdrv_find_format(const char *format_name) | |
228 | { | |
229 | BlockDriver *drv1; | |
230 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { | |
231 | if (!strcmp(drv1->format_name, format_name)) { | |
232 | return drv1; | |
233 | } | |
234 | } | |
235 | return NULL; | |
236 | } | |
237 | ||
238 | static int bdrv_is_whitelisted(BlockDriver *drv) | |
239 | { | |
240 | static const char *whitelist[] = { | |
241 | CONFIG_BDRV_WHITELIST | |
242 | }; | |
243 | const char **p; | |
244 | ||
245 | if (!whitelist[0]) | |
246 | return 1; /* no whitelist, anything goes */ | |
247 | ||
248 | for (p = whitelist; *p; p++) { | |
249 | if (!strcmp(drv->format_name, *p)) { | |
250 | return 1; | |
251 | } | |
252 | } | |
253 | return 0; | |
254 | } | |
255 | ||
256 | BlockDriver *bdrv_find_whitelisted_format(const char *format_name) | |
257 | { | |
258 | BlockDriver *drv = bdrv_find_format(format_name); | |
259 | return drv && bdrv_is_whitelisted(drv) ? drv : NULL; | |
260 | } | |
261 | ||
262 | int bdrv_create(BlockDriver *drv, const char* filename, | |
263 | QEMUOptionParameter *options) | |
264 | { | |
265 | if (!drv->bdrv_create) | |
266 | return -ENOTSUP; | |
267 | ||
268 | return drv->bdrv_create(filename, options); | |
269 | } | |
270 | ||
271 | int bdrv_create_file(const char* filename, QEMUOptionParameter *options) | |
272 | { | |
273 | BlockDriver *drv; | |
274 | ||
275 | drv = bdrv_find_protocol(filename); | |
276 | if (drv == NULL) { | |
277 | return -ENOENT; | |
278 | } | |
279 | ||
280 | return bdrv_create(drv, filename, options); | |
281 | } | |
282 | ||
283 | #ifdef _WIN32 | |
284 | void get_tmp_filename(char *filename, int size) | |
285 | { | |
286 | char temp_dir[MAX_PATH]; | |
287 | ||
288 | GetTempPath(MAX_PATH, temp_dir); | |
289 | GetTempFileName(temp_dir, "qem", 0, filename); | |
290 | } | |
291 | #else | |
292 | void get_tmp_filename(char *filename, int size) | |
293 | { | |
294 | int fd; | |
295 | const char *tmpdir; | |
296 | /* XXX: race condition possible */ | |
297 | tmpdir = getenv("TMPDIR"); | |
298 | if (!tmpdir) | |
299 | tmpdir = "/tmp"; | |
300 | snprintf(filename, size, "%s/vl.XXXXXX", tmpdir); | |
301 | fd = mkstemp(filename); | |
302 | close(fd); | |
303 | } | |
304 | #endif | |
305 | ||
306 | /* | |
307 | * Detect host devices. By convention, /dev/cdrom[N] is always | |
308 | * recognized as a host CDROM. | |
309 | */ | |
310 | static BlockDriver *find_hdev_driver(const char *filename) | |
311 | { | |
312 | int score_max = 0, score; | |
313 | BlockDriver *drv = NULL, *d; | |
314 | ||
315 | QLIST_FOREACH(d, &bdrv_drivers, list) { | |
316 | if (d->bdrv_probe_device) { | |
317 | score = d->bdrv_probe_device(filename); | |
318 | if (score > score_max) { | |
319 | score_max = score; | |
320 | drv = d; | |
321 | } | |
322 | } | |
323 | } | |
324 | ||
325 | return drv; | |
326 | } | |
327 | ||
328 | BlockDriver *bdrv_find_protocol(const char *filename) | |
329 | { | |
330 | BlockDriver *drv1; | |
331 | char protocol[128]; | |
332 | int len; | |
333 | const char *p; | |
334 | ||
335 | /* TODO Drivers without bdrv_file_open must be specified explicitly */ | |
336 | ||
337 | /* | |
338 | * XXX(hch): we really should not let host device detection | |
339 | * override an explicit protocol specification, but moving this | |
340 | * later breaks access to device names with colons in them. | |
341 | * Thanks to the brain-dead persistent naming schemes on udev- | |
342 | * based Linux systems those actually are quite common. | |
343 | */ | |
344 | drv1 = find_hdev_driver(filename); | |
345 | if (drv1) { | |
346 | return drv1; | |
347 | } | |
348 | ||
349 | if (!path_has_protocol(filename)) { | |
350 | return bdrv_find_format("file"); | |
351 | } | |
352 | p = strchr(filename, ':'); | |
353 | assert(p != NULL); | |
354 | len = p - filename; | |
355 | if (len > sizeof(protocol) - 1) | |
356 | len = sizeof(protocol) - 1; | |
357 | memcpy(protocol, filename, len); | |
358 | protocol[len] = '\0'; | |
359 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { | |
360 | if (drv1->protocol_name && | |
361 | !strcmp(drv1->protocol_name, protocol)) { | |
362 | return drv1; | |
363 | } | |
364 | } | |
365 | return NULL; | |
366 | } | |
367 | ||
368 | static int find_image_format(const char *filename, BlockDriver **pdrv) | |
369 | { | |
370 | int ret, score, score_max; | |
371 | BlockDriver *drv1, *drv; | |
372 | uint8_t buf[2048]; | |
373 | BlockDriverState *bs; | |
374 | ||
375 | ret = bdrv_file_open(&bs, filename, 0); | |
376 | if (ret < 0) { | |
377 | *pdrv = NULL; | |
378 | return ret; | |
379 | } | |
380 | ||
381 | /* Return the raw BlockDriver * to scsi-generic devices or empty drives */ | |
382 | if (bs->sg || !bdrv_is_inserted(bs)) { | |
383 | bdrv_delete(bs); | |
384 | drv = bdrv_find_format("raw"); | |
385 | if (!drv) { | |
386 | ret = -ENOENT; | |
387 | } | |
388 | *pdrv = drv; | |
389 | return ret; | |
390 | } | |
391 | ||
392 | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); | |
393 | bdrv_delete(bs); | |
394 | if (ret < 0) { | |
395 | *pdrv = NULL; | |
396 | return ret; | |
397 | } | |
398 | ||
399 | score_max = 0; | |
400 | drv = NULL; | |
401 | QLIST_FOREACH(drv1, &bdrv_drivers, list) { | |
402 | if (drv1->bdrv_probe) { | |
403 | score = drv1->bdrv_probe(buf, ret, filename); | |
404 | if (score > score_max) { | |
405 | score_max = score; | |
406 | drv = drv1; | |
407 | } | |
408 | } | |
409 | } | |
410 | if (!drv) { | |
411 | ret = -ENOENT; | |
412 | } | |
413 | *pdrv = drv; | |
414 | return ret; | |
415 | } | |
416 | ||
417 | /** | |
418 | * Set the current 'total_sectors' value | |
419 | */ | |
420 | static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) | |
421 | { | |
422 | BlockDriver *drv = bs->drv; | |
423 | ||
424 | /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */ | |
425 | if (bs->sg) | |
426 | return 0; | |
427 | ||
428 | /* query actual device if possible, otherwise just trust the hint */ | |
429 | if (drv->bdrv_getlength) { | |
430 | int64_t length = drv->bdrv_getlength(bs); | |
431 | if (length < 0) { | |
432 | return length; | |
433 | } | |
434 | hint = length >> BDRV_SECTOR_BITS; | |
435 | } | |
436 | ||
437 | bs->total_sectors = hint; | |
438 | return 0; | |
439 | } | |
440 | ||
441 | /** | |
442 | * Set open flags for a given cache mode | |
443 | * | |
444 | * Return 0 on success, -1 if the cache mode was invalid. | |
445 | */ | |
446 | int bdrv_parse_cache_flags(const char *mode, int *flags) | |
447 | { | |
448 | *flags &= ~BDRV_O_CACHE_MASK; | |
449 | ||
450 | if (!strcmp(mode, "off") || !strcmp(mode, "none")) { | |
451 | *flags |= BDRV_O_NOCACHE | BDRV_O_CACHE_WB; | |
452 | } else if (!strcmp(mode, "directsync")) { | |
453 | *flags |= BDRV_O_NOCACHE; | |
454 | } else if (!strcmp(mode, "writeback")) { | |
455 | *flags |= BDRV_O_CACHE_WB; | |
456 | } else if (!strcmp(mode, "unsafe")) { | |
457 | *flags |= BDRV_O_CACHE_WB; | |
458 | *flags |= BDRV_O_NO_FLUSH; | |
459 | } else if (!strcmp(mode, "writethrough")) { | |
460 | /* this is the default */ | |
461 | } else { | |
462 | return -1; | |
463 | } | |
464 | ||
465 | return 0; | |
466 | } | |
467 | ||
468 | /* | |
469 | * Common part for opening disk images and files | |
470 | */ | |
471 | static int bdrv_open_common(BlockDriverState *bs, const char *filename, | |
472 | int flags, BlockDriver *drv) | |
473 | { | |
474 | int ret, open_flags; | |
475 | ||
476 | assert(drv != NULL); | |
477 | ||
478 | bs->file = NULL; | |
479 | bs->total_sectors = 0; | |
480 | bs->encrypted = 0; | |
481 | bs->valid_key = 0; | |
482 | bs->open_flags = flags; | |
483 | /* buffer_alignment defaulted to 512, drivers can change this value */ | |
484 | bs->buffer_alignment = 512; | |
485 | ||
486 | pstrcpy(bs->filename, sizeof(bs->filename), filename); | |
487 | ||
488 | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) { | |
489 | return -ENOTSUP; | |
490 | } | |
491 | ||
492 | bs->drv = drv; | |
493 | bs->opaque = g_malloc0(drv->instance_size); | |
494 | ||
495 | if (flags & BDRV_O_CACHE_WB) | |
496 | bs->enable_write_cache = 1; | |
497 | ||
498 | /* | |
499 | * Clear flags that are internal to the block layer before opening the | |
500 | * image. | |
501 | */ | |
502 | open_flags = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
503 | ||
504 | /* | |
505 | * Snapshots should be writable. | |
506 | */ | |
507 | if (bs->is_temporary) { | |
508 | open_flags |= BDRV_O_RDWR; | |
509 | } | |
510 | ||
511 | /* Open the image, either directly or using a protocol */ | |
512 | if (drv->bdrv_file_open) { | |
513 | ret = drv->bdrv_file_open(bs, filename, open_flags); | |
514 | } else { | |
515 | ret = bdrv_file_open(&bs->file, filename, open_flags); | |
516 | if (ret >= 0) { | |
517 | ret = drv->bdrv_open(bs, open_flags); | |
518 | } | |
519 | } | |
520 | ||
521 | if (ret < 0) { | |
522 | goto free_and_fail; | |
523 | } | |
524 | ||
525 | bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR); | |
526 | ||
527 | ret = refresh_total_sectors(bs, bs->total_sectors); | |
528 | if (ret < 0) { | |
529 | goto free_and_fail; | |
530 | } | |
531 | ||
532 | #ifndef _WIN32 | |
533 | if (bs->is_temporary) { | |
534 | unlink(filename); | |
535 | } | |
536 | #endif | |
537 | return 0; | |
538 | ||
539 | free_and_fail: | |
540 | if (bs->file) { | |
541 | bdrv_delete(bs->file); | |
542 | bs->file = NULL; | |
543 | } | |
544 | g_free(bs->opaque); | |
545 | bs->opaque = NULL; | |
546 | bs->drv = NULL; | |
547 | return ret; | |
548 | } | |
549 | ||
550 | /* | |
551 | * Opens a file using a protocol (file, host_device, nbd, ...) | |
552 | */ | |
553 | int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) | |
554 | { | |
555 | BlockDriverState *bs; | |
556 | BlockDriver *drv; | |
557 | int ret; | |
558 | ||
559 | drv = bdrv_find_protocol(filename); | |
560 | if (!drv) { | |
561 | return -ENOENT; | |
562 | } | |
563 | ||
564 | bs = bdrv_new(""); | |
565 | ret = bdrv_open_common(bs, filename, flags, drv); | |
566 | if (ret < 0) { | |
567 | bdrv_delete(bs); | |
568 | return ret; | |
569 | } | |
570 | bs->growable = 1; | |
571 | *pbs = bs; | |
572 | return 0; | |
573 | } | |
574 | ||
575 | /* | |
576 | * Opens a disk image (raw, qcow2, vmdk, ...) | |
577 | */ | |
578 | int bdrv_open(BlockDriverState *bs, const char *filename, int flags, | |
579 | BlockDriver *drv) | |
580 | { | |
581 | int ret; | |
582 | ||
583 | if (flags & BDRV_O_SNAPSHOT) { | |
584 | BlockDriverState *bs1; | |
585 | int64_t total_size; | |
586 | int is_protocol = 0; | |
587 | BlockDriver *bdrv_qcow2; | |
588 | QEMUOptionParameter *options; | |
589 | char tmp_filename[PATH_MAX]; | |
590 | char backing_filename[PATH_MAX]; | |
591 | ||
592 | /* if snapshot, we create a temporary backing file and open it | |
593 | instead of opening 'filename' directly */ | |
594 | ||
595 | /* if there is a backing file, use it */ | |
596 | bs1 = bdrv_new(""); | |
597 | ret = bdrv_open(bs1, filename, 0, drv); | |
598 | if (ret < 0) { | |
599 | bdrv_delete(bs1); | |
600 | return ret; | |
601 | } | |
602 | total_size = bdrv_getlength(bs1) & BDRV_SECTOR_MASK; | |
603 | ||
604 | if (bs1->drv && bs1->drv->protocol_name) | |
605 | is_protocol = 1; | |
606 | ||
607 | bdrv_delete(bs1); | |
608 | ||
609 | get_tmp_filename(tmp_filename, sizeof(tmp_filename)); | |
610 | ||
611 | /* Real path is meaningless for protocols */ | |
612 | if (is_protocol) | |
613 | snprintf(backing_filename, sizeof(backing_filename), | |
614 | "%s", filename); | |
615 | else if (!realpath(filename, backing_filename)) | |
616 | return -errno; | |
617 | ||
618 | bdrv_qcow2 = bdrv_find_format("qcow2"); | |
619 | options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); | |
620 | ||
621 | set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size); | |
622 | set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); | |
623 | if (drv) { | |
624 | set_option_parameter(options, BLOCK_OPT_BACKING_FMT, | |
625 | drv->format_name); | |
626 | } | |
627 | ||
628 | ret = bdrv_create(bdrv_qcow2, tmp_filename, options); | |
629 | free_option_parameters(options); | |
630 | if (ret < 0) { | |
631 | return ret; | |
632 | } | |
633 | ||
634 | filename = tmp_filename; | |
635 | drv = bdrv_qcow2; | |
636 | bs->is_temporary = 1; | |
637 | } | |
638 | ||
639 | /* Find the right image format driver */ | |
640 | if (!drv) { | |
641 | ret = find_image_format(filename, &drv); | |
642 | } | |
643 | ||
644 | if (!drv) { | |
645 | goto unlink_and_fail; | |
646 | } | |
647 | ||
648 | /* Open the image */ | |
649 | ret = bdrv_open_common(bs, filename, flags, drv); | |
650 | if (ret < 0) { | |
651 | goto unlink_and_fail; | |
652 | } | |
653 | ||
654 | /* If there is a backing file, use it */ | |
655 | if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') { | |
656 | char backing_filename[PATH_MAX]; | |
657 | int back_flags; | |
658 | BlockDriver *back_drv = NULL; | |
659 | ||
660 | bs->backing_hd = bdrv_new(""); | |
661 | ||
662 | if (path_has_protocol(bs->backing_file)) { | |
663 | pstrcpy(backing_filename, sizeof(backing_filename), | |
664 | bs->backing_file); | |
665 | } else { | |
666 | path_combine(backing_filename, sizeof(backing_filename), | |
667 | filename, bs->backing_file); | |
668 | } | |
669 | ||
670 | if (bs->backing_format[0] != '\0') { | |
671 | back_drv = bdrv_find_format(bs->backing_format); | |
672 | } | |
673 | ||
674 | /* backing files always opened read-only */ | |
675 | back_flags = | |
676 | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); | |
677 | ||
678 | ret = bdrv_open(bs->backing_hd, backing_filename, back_flags, back_drv); | |
679 | if (ret < 0) { | |
680 | bdrv_close(bs); | |
681 | return ret; | |
682 | } | |
683 | if (bs->is_temporary) { | |
684 | bs->backing_hd->keep_read_only = !(flags & BDRV_O_RDWR); | |
685 | } else { | |
686 | /* base image inherits from "parent" */ | |
687 | bs->backing_hd->keep_read_only = bs->keep_read_only; | |
688 | } | |
689 | } | |
690 | ||
691 | if (!bdrv_key_required(bs)) { | |
692 | bs->media_changed = 1; | |
693 | bdrv_dev_change_cb(bs, CHANGE_MEDIA); | |
694 | } | |
695 | ||
696 | return 0; | |
697 | ||
698 | unlink_and_fail: | |
699 | if (bs->is_temporary) { | |
700 | unlink(filename); | |
701 | } | |
702 | return ret; | |
703 | } | |
704 | ||
705 | void bdrv_close(BlockDriverState *bs) | |
706 | { | |
707 | if (bs->drv) { | |
708 | if (bs == bs_snapshots) { | |
709 | bs_snapshots = NULL; | |
710 | } | |
711 | if (bs->backing_hd) { | |
712 | bdrv_delete(bs->backing_hd); | |
713 | bs->backing_hd = NULL; | |
714 | } | |
715 | bs->drv->bdrv_close(bs); | |
716 | g_free(bs->opaque); | |
717 | #ifdef _WIN32 | |
718 | if (bs->is_temporary) { | |
719 | unlink(bs->filename); | |
720 | } | |
721 | #endif | |
722 | bs->opaque = NULL; | |
723 | bs->drv = NULL; | |
724 | ||
725 | if (bs->file != NULL) { | |
726 | bdrv_close(bs->file); | |
727 | } | |
728 | ||
729 | bs->media_changed = 1; | |
730 | bdrv_dev_change_cb(bs, CHANGE_MEDIA); | |
731 | } | |
732 | } | |
733 | ||
734 | void bdrv_close_all(void) | |
735 | { | |
736 | BlockDriverState *bs; | |
737 | ||
738 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
739 | bdrv_close(bs); | |
740 | } | |
741 | } | |
742 | ||
743 | /* make a BlockDriverState anonymous by removing from bdrv_state list. | |
744 | Also, NULL terminate the device_name to prevent double remove */ | |
745 | void bdrv_make_anon(BlockDriverState *bs) | |
746 | { | |
747 | if (bs->device_name[0] != '\0') { | |
748 | QTAILQ_REMOVE(&bdrv_states, bs, list); | |
749 | } | |
750 | bs->device_name[0] = '\0'; | |
751 | } | |
752 | ||
753 | void bdrv_delete(BlockDriverState *bs) | |
754 | { | |
755 | assert(!bs->dev); | |
756 | ||
757 | /* remove from list, if necessary */ | |
758 | bdrv_make_anon(bs); | |
759 | ||
760 | bdrv_close(bs); | |
761 | if (bs->file != NULL) { | |
762 | bdrv_delete(bs->file); | |
763 | } | |
764 | ||
765 | assert(bs != bs_snapshots); | |
766 | g_free(bs); | |
767 | } | |
768 | ||
769 | int bdrv_attach_dev(BlockDriverState *bs, void *dev) | |
770 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
771 | { | |
772 | if (bs->dev) { | |
773 | return -EBUSY; | |
774 | } | |
775 | bs->dev = dev; | |
776 | return 0; | |
777 | } | |
778 | ||
779 | /* TODO qdevified devices don't use this, remove when devices are qdevified */ | |
780 | void bdrv_attach_dev_nofail(BlockDriverState *bs, void *dev) | |
781 | { | |
782 | if (bdrv_attach_dev(bs, dev) < 0) { | |
783 | abort(); | |
784 | } | |
785 | } | |
786 | ||
787 | void bdrv_detach_dev(BlockDriverState *bs, void *dev) | |
788 | /* TODO change to DeviceState *dev when all users are qdevified */ | |
789 | { | |
790 | assert(bs->dev == dev); | |
791 | bs->dev = NULL; | |
792 | bs->dev_ops = NULL; | |
793 | bs->dev_opaque = NULL; | |
794 | } | |
795 | ||
796 | /* TODO change to return DeviceState * when all users are qdevified */ | |
797 | void *bdrv_get_attached_dev(BlockDriverState *bs) | |
798 | { | |
799 | return bs->dev; | |
800 | } | |
801 | ||
802 | void bdrv_set_dev_ops(BlockDriverState *bs, const BlockDevOps *ops, | |
803 | void *opaque) | |
804 | { | |
805 | bs->dev_ops = ops; | |
806 | bs->dev_opaque = opaque; | |
807 | } | |
808 | ||
809 | static void bdrv_dev_change_cb(BlockDriverState *bs, int reason) | |
810 | { | |
811 | if (bs->dev_ops && bs->dev_ops->change_cb) { | |
812 | bs->dev_ops->change_cb(bs->dev_opaque, reason); | |
813 | } | |
814 | } | |
815 | ||
816 | /* | |
817 | * Run consistency checks on an image | |
818 | * | |
819 | * Returns 0 if the check could be completed (it doesn't mean that the image is | |
820 | * free of errors) or -errno when an internal error occurred. The results of the | |
821 | * check are stored in res. | |
822 | */ | |
823 | int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res) | |
824 | { | |
825 | if (bs->drv->bdrv_check == NULL) { | |
826 | return -ENOTSUP; | |
827 | } | |
828 | ||
829 | memset(res, 0, sizeof(*res)); | |
830 | return bs->drv->bdrv_check(bs, res); | |
831 | } | |
832 | ||
833 | #define COMMIT_BUF_SECTORS 2048 | |
834 | ||
835 | /* commit COW file into the raw image */ | |
836 | int bdrv_commit(BlockDriverState *bs) | |
837 | { | |
838 | BlockDriver *drv = bs->drv; | |
839 | BlockDriver *backing_drv; | |
840 | int64_t sector, total_sectors; | |
841 | int n, ro, open_flags; | |
842 | int ret = 0, rw_ret = 0; | |
843 | uint8_t *buf; | |
844 | char filename[1024]; | |
845 | BlockDriverState *bs_rw, *bs_ro; | |
846 | ||
847 | if (!drv) | |
848 | return -ENOMEDIUM; | |
849 | ||
850 | if (!bs->backing_hd) { | |
851 | return -ENOTSUP; | |
852 | } | |
853 | ||
854 | if (bs->backing_hd->keep_read_only) { | |
855 | return -EACCES; | |
856 | } | |
857 | ||
858 | backing_drv = bs->backing_hd->drv; | |
859 | ro = bs->backing_hd->read_only; | |
860 | strncpy(filename, bs->backing_hd->filename, sizeof(filename)); | |
861 | open_flags = bs->backing_hd->open_flags; | |
862 | ||
863 | if (ro) { | |
864 | /* re-open as RW */ | |
865 | bdrv_delete(bs->backing_hd); | |
866 | bs->backing_hd = NULL; | |
867 | bs_rw = bdrv_new(""); | |
868 | rw_ret = bdrv_open(bs_rw, filename, open_flags | BDRV_O_RDWR, | |
869 | backing_drv); | |
870 | if (rw_ret < 0) { | |
871 | bdrv_delete(bs_rw); | |
872 | /* try to re-open read-only */ | |
873 | bs_ro = bdrv_new(""); | |
874 | ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, | |
875 | backing_drv); | |
876 | if (ret < 0) { | |
877 | bdrv_delete(bs_ro); | |
878 | /* drive not functional anymore */ | |
879 | bs->drv = NULL; | |
880 | return ret; | |
881 | } | |
882 | bs->backing_hd = bs_ro; | |
883 | return rw_ret; | |
884 | } | |
885 | bs->backing_hd = bs_rw; | |
886 | } | |
887 | ||
888 | total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; | |
889 | buf = g_malloc(COMMIT_BUF_SECTORS * BDRV_SECTOR_SIZE); | |
890 | ||
891 | for (sector = 0; sector < total_sectors; sector += n) { | |
892 | if (drv->bdrv_is_allocated(bs, sector, COMMIT_BUF_SECTORS, &n)) { | |
893 | ||
894 | if (bdrv_read(bs, sector, buf, n) != 0) { | |
895 | ret = -EIO; | |
896 | goto ro_cleanup; | |
897 | } | |
898 | ||
899 | if (bdrv_write(bs->backing_hd, sector, buf, n) != 0) { | |
900 | ret = -EIO; | |
901 | goto ro_cleanup; | |
902 | } | |
903 | } | |
904 | } | |
905 | ||
906 | if (drv->bdrv_make_empty) { | |
907 | ret = drv->bdrv_make_empty(bs); | |
908 | bdrv_flush(bs); | |
909 | } | |
910 | ||
911 | /* | |
912 | * Make sure all data we wrote to the backing device is actually | |
913 | * stable on disk. | |
914 | */ | |
915 | if (bs->backing_hd) | |
916 | bdrv_flush(bs->backing_hd); | |
917 | ||
918 | ro_cleanup: | |
919 | g_free(buf); | |
920 | ||
921 | if (ro) { | |
922 | /* re-open as RO */ | |
923 | bdrv_delete(bs->backing_hd); | |
924 | bs->backing_hd = NULL; | |
925 | bs_ro = bdrv_new(""); | |
926 | ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, | |
927 | backing_drv); | |
928 | if (ret < 0) { | |
929 | bdrv_delete(bs_ro); | |
930 | /* drive not functional anymore */ | |
931 | bs->drv = NULL; | |
932 | return ret; | |
933 | } | |
934 | bs->backing_hd = bs_ro; | |
935 | bs->backing_hd->keep_read_only = 0; | |
936 | } | |
937 | ||
938 | return ret; | |
939 | } | |
940 | ||
941 | void bdrv_commit_all(void) | |
942 | { | |
943 | BlockDriverState *bs; | |
944 | ||
945 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
946 | bdrv_commit(bs); | |
947 | } | |
948 | } | |
949 | ||
950 | /* | |
951 | * Return values: | |
952 | * 0 - success | |
953 | * -EINVAL - backing format specified, but no file | |
954 | * -ENOSPC - can't update the backing file because no space is left in the | |
955 | * image file header | |
956 | * -ENOTSUP - format driver doesn't support changing the backing file | |
957 | */ | |
958 | int bdrv_change_backing_file(BlockDriverState *bs, | |
959 | const char *backing_file, const char *backing_fmt) | |
960 | { | |
961 | BlockDriver *drv = bs->drv; | |
962 | ||
963 | if (drv->bdrv_change_backing_file != NULL) { | |
964 | return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt); | |
965 | } else { | |
966 | return -ENOTSUP; | |
967 | } | |
968 | } | |
969 | ||
970 | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, | |
971 | size_t size) | |
972 | { | |
973 | int64_t len; | |
974 | ||
975 | if (!bdrv_is_inserted(bs)) | |
976 | return -ENOMEDIUM; | |
977 | ||
978 | if (bs->growable) | |
979 | return 0; | |
980 | ||
981 | len = bdrv_getlength(bs); | |
982 | ||
983 | if (offset < 0) | |
984 | return -EIO; | |
985 | ||
986 | if ((offset > len) || (len - offset < size)) | |
987 | return -EIO; | |
988 | ||
989 | return 0; | |
990 | } | |
991 | ||
992 | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, | |
993 | int nb_sectors) | |
994 | { | |
995 | return bdrv_check_byte_request(bs, sector_num * BDRV_SECTOR_SIZE, | |
996 | nb_sectors * BDRV_SECTOR_SIZE); | |
997 | } | |
998 | ||
999 | static inline bool bdrv_has_async_rw(BlockDriver *drv) | |
1000 | { | |
1001 | return drv->bdrv_co_readv != bdrv_co_readv_em | |
1002 | || drv->bdrv_aio_readv != bdrv_aio_readv_em; | |
1003 | } | |
1004 | ||
1005 | static inline bool bdrv_has_async_flush(BlockDriver *drv) | |
1006 | { | |
1007 | return drv->bdrv_aio_flush != bdrv_aio_flush_em; | |
1008 | } | |
1009 | ||
1010 | /* return < 0 if error. See bdrv_write() for the return codes */ | |
1011 | int bdrv_read(BlockDriverState *bs, int64_t sector_num, | |
1012 | uint8_t *buf, int nb_sectors) | |
1013 | { | |
1014 | BlockDriver *drv = bs->drv; | |
1015 | ||
1016 | if (!drv) | |
1017 | return -ENOMEDIUM; | |
1018 | ||
1019 | if (bdrv_has_async_rw(drv) && qemu_in_coroutine()) { | |
1020 | QEMUIOVector qiov; | |
1021 | struct iovec iov = { | |
1022 | .iov_base = (void *)buf, | |
1023 | .iov_len = nb_sectors * BDRV_SECTOR_SIZE, | |
1024 | }; | |
1025 | ||
1026 | qemu_iovec_init_external(&qiov, &iov, 1); | |
1027 | return bdrv_co_readv(bs, sector_num, nb_sectors, &qiov); | |
1028 | } | |
1029 | ||
1030 | if (bdrv_check_request(bs, sector_num, nb_sectors)) | |
1031 | return -EIO; | |
1032 | ||
1033 | return drv->bdrv_read(bs, sector_num, buf, nb_sectors); | |
1034 | } | |
1035 | ||
1036 | static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num, | |
1037 | int nb_sectors, int dirty) | |
1038 | { | |
1039 | int64_t start, end; | |
1040 | unsigned long val, idx, bit; | |
1041 | ||
1042 | start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; | |
1043 | end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK; | |
1044 | ||
1045 | for (; start <= end; start++) { | |
1046 | idx = start / (sizeof(unsigned long) * 8); | |
1047 | bit = start % (sizeof(unsigned long) * 8); | |
1048 | val = bs->dirty_bitmap[idx]; | |
1049 | if (dirty) { | |
1050 | if (!(val & (1UL << bit))) { | |
1051 | bs->dirty_count++; | |
1052 | val |= 1UL << bit; | |
1053 | } | |
1054 | } else { | |
1055 | if (val & (1UL << bit)) { | |
1056 | bs->dirty_count--; | |
1057 | val &= ~(1UL << bit); | |
1058 | } | |
1059 | } | |
1060 | bs->dirty_bitmap[idx] = val; | |
1061 | } | |
1062 | } | |
1063 | ||
1064 | /* Return < 0 if error. Important errors are: | |
1065 | -EIO generic I/O error (may happen for all errors) | |
1066 | -ENOMEDIUM No media inserted. | |
1067 | -EINVAL Invalid sector number or nb_sectors | |
1068 | -EACCES Trying to write a read-only device | |
1069 | */ | |
1070 | int bdrv_write(BlockDriverState *bs, int64_t sector_num, | |
1071 | const uint8_t *buf, int nb_sectors) | |
1072 | { | |
1073 | BlockDriver *drv = bs->drv; | |
1074 | ||
1075 | if (!bs->drv) | |
1076 | return -ENOMEDIUM; | |
1077 | ||
1078 | if (bdrv_has_async_rw(drv) && qemu_in_coroutine()) { | |
1079 | QEMUIOVector qiov; | |
1080 | struct iovec iov = { | |
1081 | .iov_base = (void *)buf, | |
1082 | .iov_len = nb_sectors * BDRV_SECTOR_SIZE, | |
1083 | }; | |
1084 | ||
1085 | qemu_iovec_init_external(&qiov, &iov, 1); | |
1086 | return bdrv_co_writev(bs, sector_num, nb_sectors, &qiov); | |
1087 | } | |
1088 | ||
1089 | if (bs->read_only) | |
1090 | return -EACCES; | |
1091 | if (bdrv_check_request(bs, sector_num, nb_sectors)) | |
1092 | return -EIO; | |
1093 | ||
1094 | if (bs->dirty_bitmap) { | |
1095 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); | |
1096 | } | |
1097 | ||
1098 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { | |
1099 | bs->wr_highest_sector = sector_num + nb_sectors - 1; | |
1100 | } | |
1101 | ||
1102 | return drv->bdrv_write(bs, sector_num, buf, nb_sectors); | |
1103 | } | |
1104 | ||
1105 | int bdrv_pread(BlockDriverState *bs, int64_t offset, | |
1106 | void *buf, int count1) | |
1107 | { | |
1108 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; | |
1109 | int len, nb_sectors, count; | |
1110 | int64_t sector_num; | |
1111 | int ret; | |
1112 | ||
1113 | count = count1; | |
1114 | /* first read to align to sector start */ | |
1115 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); | |
1116 | if (len > count) | |
1117 | len = count; | |
1118 | sector_num = offset >> BDRV_SECTOR_BITS; | |
1119 | if (len > 0) { | |
1120 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) | |
1121 | return ret; | |
1122 | memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len); | |
1123 | count -= len; | |
1124 | if (count == 0) | |
1125 | return count1; | |
1126 | sector_num++; | |
1127 | buf += len; | |
1128 | } | |
1129 | ||
1130 | /* read the sectors "in place" */ | |
1131 | nb_sectors = count >> BDRV_SECTOR_BITS; | |
1132 | if (nb_sectors > 0) { | |
1133 | if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0) | |
1134 | return ret; | |
1135 | sector_num += nb_sectors; | |
1136 | len = nb_sectors << BDRV_SECTOR_BITS; | |
1137 | buf += len; | |
1138 | count -= len; | |
1139 | } | |
1140 | ||
1141 | /* add data from the last sector */ | |
1142 | if (count > 0) { | |
1143 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) | |
1144 | return ret; | |
1145 | memcpy(buf, tmp_buf, count); | |
1146 | } | |
1147 | return count1; | |
1148 | } | |
1149 | ||
1150 | int bdrv_pwrite(BlockDriverState *bs, int64_t offset, | |
1151 | const void *buf, int count1) | |
1152 | { | |
1153 | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; | |
1154 | int len, nb_sectors, count; | |
1155 | int64_t sector_num; | |
1156 | int ret; | |
1157 | ||
1158 | count = count1; | |
1159 | /* first write to align to sector start */ | |
1160 | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1); | |
1161 | if (len > count) | |
1162 | len = count; | |
1163 | sector_num = offset >> BDRV_SECTOR_BITS; | |
1164 | if (len > 0) { | |
1165 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) | |
1166 | return ret; | |
1167 | memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len); | |
1168 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) | |
1169 | return ret; | |
1170 | count -= len; | |
1171 | if (count == 0) | |
1172 | return count1; | |
1173 | sector_num++; | |
1174 | buf += len; | |
1175 | } | |
1176 | ||
1177 | /* write the sectors "in place" */ | |
1178 | nb_sectors = count >> BDRV_SECTOR_BITS; | |
1179 | if (nb_sectors > 0) { | |
1180 | if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0) | |
1181 | return ret; | |
1182 | sector_num += nb_sectors; | |
1183 | len = nb_sectors << BDRV_SECTOR_BITS; | |
1184 | buf += len; | |
1185 | count -= len; | |
1186 | } | |
1187 | ||
1188 | /* add data from the last sector */ | |
1189 | if (count > 0) { | |
1190 | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) | |
1191 | return ret; | |
1192 | memcpy(tmp_buf, buf, count); | |
1193 | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) | |
1194 | return ret; | |
1195 | } | |
1196 | return count1; | |
1197 | } | |
1198 | ||
1199 | /* | |
1200 | * Writes to the file and ensures that no writes are reordered across this | |
1201 | * request (acts as a barrier) | |
1202 | * | |
1203 | * Returns 0 on success, -errno in error cases. | |
1204 | */ | |
1205 | int bdrv_pwrite_sync(BlockDriverState *bs, int64_t offset, | |
1206 | const void *buf, int count) | |
1207 | { | |
1208 | int ret; | |
1209 | ||
1210 | ret = bdrv_pwrite(bs, offset, buf, count); | |
1211 | if (ret < 0) { | |
1212 | return ret; | |
1213 | } | |
1214 | ||
1215 | /* No flush needed for cache modes that use O_DSYNC */ | |
1216 | if ((bs->open_flags & BDRV_O_CACHE_WB) != 0) { | |
1217 | bdrv_flush(bs); | |
1218 | } | |
1219 | ||
1220 | return 0; | |
1221 | } | |
1222 | ||
1223 | int coroutine_fn bdrv_co_readv(BlockDriverState *bs, int64_t sector_num, | |
1224 | int nb_sectors, QEMUIOVector *qiov) | |
1225 | { | |
1226 | BlockDriver *drv = bs->drv; | |
1227 | ||
1228 | trace_bdrv_co_readv(bs, sector_num, nb_sectors); | |
1229 | ||
1230 | if (!drv) { | |
1231 | return -ENOMEDIUM; | |
1232 | } | |
1233 | if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
1234 | return -EIO; | |
1235 | } | |
1236 | ||
1237 | return drv->bdrv_co_readv(bs, sector_num, nb_sectors, qiov); | |
1238 | } | |
1239 | ||
1240 | int coroutine_fn bdrv_co_writev(BlockDriverState *bs, int64_t sector_num, | |
1241 | int nb_sectors, QEMUIOVector *qiov) | |
1242 | { | |
1243 | BlockDriver *drv = bs->drv; | |
1244 | ||
1245 | trace_bdrv_co_writev(bs, sector_num, nb_sectors); | |
1246 | ||
1247 | if (!bs->drv) { | |
1248 | return -ENOMEDIUM; | |
1249 | } | |
1250 | if (bs->read_only) { | |
1251 | return -EACCES; | |
1252 | } | |
1253 | if (bdrv_check_request(bs, sector_num, nb_sectors)) { | |
1254 | return -EIO; | |
1255 | } | |
1256 | ||
1257 | if (bs->dirty_bitmap) { | |
1258 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); | |
1259 | } | |
1260 | ||
1261 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { | |
1262 | bs->wr_highest_sector = sector_num + nb_sectors - 1; | |
1263 | } | |
1264 | ||
1265 | return drv->bdrv_co_writev(bs, sector_num, nb_sectors, qiov); | |
1266 | } | |
1267 | ||
1268 | /** | |
1269 | * Truncate file to 'offset' bytes (needed only for file protocols) | |
1270 | */ | |
1271 | int bdrv_truncate(BlockDriverState *bs, int64_t offset) | |
1272 | { | |
1273 | BlockDriver *drv = bs->drv; | |
1274 | int ret; | |
1275 | if (!drv) | |
1276 | return -ENOMEDIUM; | |
1277 | if (!drv->bdrv_truncate) | |
1278 | return -ENOTSUP; | |
1279 | if (bs->read_only) | |
1280 | return -EACCES; | |
1281 | if (bdrv_in_use(bs)) | |
1282 | return -EBUSY; | |
1283 | ret = drv->bdrv_truncate(bs, offset); | |
1284 | if (ret == 0) { | |
1285 | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); | |
1286 | bdrv_dev_change_cb(bs, CHANGE_SIZE); | |
1287 | } | |
1288 | return ret; | |
1289 | } | |
1290 | ||
1291 | /** | |
1292 | * Length of a allocated file in bytes. Sparse files are counted by actual | |
1293 | * allocated space. Return < 0 if error or unknown. | |
1294 | */ | |
1295 | int64_t bdrv_get_allocated_file_size(BlockDriverState *bs) | |
1296 | { | |
1297 | BlockDriver *drv = bs->drv; | |
1298 | if (!drv) { | |
1299 | return -ENOMEDIUM; | |
1300 | } | |
1301 | if (drv->bdrv_get_allocated_file_size) { | |
1302 | return drv->bdrv_get_allocated_file_size(bs); | |
1303 | } | |
1304 | if (bs->file) { | |
1305 | return bdrv_get_allocated_file_size(bs->file); | |
1306 | } | |
1307 | return -ENOTSUP; | |
1308 | } | |
1309 | ||
1310 | /** | |
1311 | * Length of a file in bytes. Return < 0 if error or unknown. | |
1312 | */ | |
1313 | int64_t bdrv_getlength(BlockDriverState *bs) | |
1314 | { | |
1315 | BlockDriver *drv = bs->drv; | |
1316 | if (!drv) | |
1317 | return -ENOMEDIUM; | |
1318 | ||
1319 | if (bs->growable || bs->removable) { | |
1320 | if (drv->bdrv_getlength) { | |
1321 | return drv->bdrv_getlength(bs); | |
1322 | } | |
1323 | } | |
1324 | return bs->total_sectors * BDRV_SECTOR_SIZE; | |
1325 | } | |
1326 | ||
1327 | /* return 0 as number of sectors if no device present or error */ | |
1328 | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr) | |
1329 | { | |
1330 | int64_t length; | |
1331 | length = bdrv_getlength(bs); | |
1332 | if (length < 0) | |
1333 | length = 0; | |
1334 | else | |
1335 | length = length >> BDRV_SECTOR_BITS; | |
1336 | *nb_sectors_ptr = length; | |
1337 | } | |
1338 | ||
1339 | struct partition { | |
1340 | uint8_t boot_ind; /* 0x80 - active */ | |
1341 | uint8_t head; /* starting head */ | |
1342 | uint8_t sector; /* starting sector */ | |
1343 | uint8_t cyl; /* starting cylinder */ | |
1344 | uint8_t sys_ind; /* What partition type */ | |
1345 | uint8_t end_head; /* end head */ | |
1346 | uint8_t end_sector; /* end sector */ | |
1347 | uint8_t end_cyl; /* end cylinder */ | |
1348 | uint32_t start_sect; /* starting sector counting from 0 */ | |
1349 | uint32_t nr_sects; /* nr of sectors in partition */ | |
1350 | } QEMU_PACKED; | |
1351 | ||
1352 | /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */ | |
1353 | static int guess_disk_lchs(BlockDriverState *bs, | |
1354 | int *pcylinders, int *pheads, int *psectors) | |
1355 | { | |
1356 | uint8_t buf[BDRV_SECTOR_SIZE]; | |
1357 | int ret, i, heads, sectors, cylinders; | |
1358 | struct partition *p; | |
1359 | uint32_t nr_sects; | |
1360 | uint64_t nb_sectors; | |
1361 | ||
1362 | bdrv_get_geometry(bs, &nb_sectors); | |
1363 | ||
1364 | ret = bdrv_read(bs, 0, buf, 1); | |
1365 | if (ret < 0) | |
1366 | return -1; | |
1367 | /* test msdos magic */ | |
1368 | if (buf[510] != 0x55 || buf[511] != 0xaa) | |
1369 | return -1; | |
1370 | for(i = 0; i < 4; i++) { | |
1371 | p = ((struct partition *)(buf + 0x1be)) + i; | |
1372 | nr_sects = le32_to_cpu(p->nr_sects); | |
1373 | if (nr_sects && p->end_head) { | |
1374 | /* We make the assumption that the partition terminates on | |
1375 | a cylinder boundary */ | |
1376 | heads = p->end_head + 1; | |
1377 | sectors = p->end_sector & 63; | |
1378 | if (sectors == 0) | |
1379 | continue; | |
1380 | cylinders = nb_sectors / (heads * sectors); | |
1381 | if (cylinders < 1 || cylinders > 16383) | |
1382 | continue; | |
1383 | *pheads = heads; | |
1384 | *psectors = sectors; | |
1385 | *pcylinders = cylinders; | |
1386 | #if 0 | |
1387 | printf("guessed geometry: LCHS=%d %d %d\n", | |
1388 | cylinders, heads, sectors); | |
1389 | #endif | |
1390 | return 0; | |
1391 | } | |
1392 | } | |
1393 | return -1; | |
1394 | } | |
1395 | ||
1396 | void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) | |
1397 | { | |
1398 | int translation, lba_detected = 0; | |
1399 | int cylinders, heads, secs; | |
1400 | uint64_t nb_sectors; | |
1401 | ||
1402 | /* if a geometry hint is available, use it */ | |
1403 | bdrv_get_geometry(bs, &nb_sectors); | |
1404 | bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); | |
1405 | translation = bdrv_get_translation_hint(bs); | |
1406 | if (cylinders != 0) { | |
1407 | *pcyls = cylinders; | |
1408 | *pheads = heads; | |
1409 | *psecs = secs; | |
1410 | } else { | |
1411 | if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { | |
1412 | if (heads > 16) { | |
1413 | /* if heads > 16, it means that a BIOS LBA | |
1414 | translation was active, so the default | |
1415 | hardware geometry is OK */ | |
1416 | lba_detected = 1; | |
1417 | goto default_geometry; | |
1418 | } else { | |
1419 | *pcyls = cylinders; | |
1420 | *pheads = heads; | |
1421 | *psecs = secs; | |
1422 | /* disable any translation to be in sync with | |
1423 | the logical geometry */ | |
1424 | if (translation == BIOS_ATA_TRANSLATION_AUTO) { | |
1425 | bdrv_set_translation_hint(bs, | |
1426 | BIOS_ATA_TRANSLATION_NONE); | |
1427 | } | |
1428 | } | |
1429 | } else { | |
1430 | default_geometry: | |
1431 | /* if no geometry, use a standard physical disk geometry */ | |
1432 | cylinders = nb_sectors / (16 * 63); | |
1433 | ||
1434 | if (cylinders > 16383) | |
1435 | cylinders = 16383; | |
1436 | else if (cylinders < 2) | |
1437 | cylinders = 2; | |
1438 | *pcyls = cylinders; | |
1439 | *pheads = 16; | |
1440 | *psecs = 63; | |
1441 | if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { | |
1442 | if ((*pcyls * *pheads) <= 131072) { | |
1443 | bdrv_set_translation_hint(bs, | |
1444 | BIOS_ATA_TRANSLATION_LARGE); | |
1445 | } else { | |
1446 | bdrv_set_translation_hint(bs, | |
1447 | BIOS_ATA_TRANSLATION_LBA); | |
1448 | } | |
1449 | } | |
1450 | } | |
1451 | bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); | |
1452 | } | |
1453 | } | |
1454 | ||
1455 | void bdrv_set_geometry_hint(BlockDriverState *bs, | |
1456 | int cyls, int heads, int secs) | |
1457 | { | |
1458 | bs->cyls = cyls; | |
1459 | bs->heads = heads; | |
1460 | bs->secs = secs; | |
1461 | } | |
1462 | ||
1463 | void bdrv_set_translation_hint(BlockDriverState *bs, int translation) | |
1464 | { | |
1465 | bs->translation = translation; | |
1466 | } | |
1467 | ||
1468 | void bdrv_get_geometry_hint(BlockDriverState *bs, | |
1469 | int *pcyls, int *pheads, int *psecs) | |
1470 | { | |
1471 | *pcyls = bs->cyls; | |
1472 | *pheads = bs->heads; | |
1473 | *psecs = bs->secs; | |
1474 | } | |
1475 | ||
1476 | /* Recognize floppy formats */ | |
1477 | typedef struct FDFormat { | |
1478 | FDriveType drive; | |
1479 | uint8_t last_sect; | |
1480 | uint8_t max_track; | |
1481 | uint8_t max_head; | |
1482 | } FDFormat; | |
1483 | ||
1484 | static const FDFormat fd_formats[] = { | |
1485 | /* First entry is default format */ | |
1486 | /* 1.44 MB 3"1/2 floppy disks */ | |
1487 | { FDRIVE_DRV_144, 18, 80, 1, }, | |
1488 | { FDRIVE_DRV_144, 20, 80, 1, }, | |
1489 | { FDRIVE_DRV_144, 21, 80, 1, }, | |
1490 | { FDRIVE_DRV_144, 21, 82, 1, }, | |
1491 | { FDRIVE_DRV_144, 21, 83, 1, }, | |
1492 | { FDRIVE_DRV_144, 22, 80, 1, }, | |
1493 | { FDRIVE_DRV_144, 23, 80, 1, }, | |
1494 | { FDRIVE_DRV_144, 24, 80, 1, }, | |
1495 | /* 2.88 MB 3"1/2 floppy disks */ | |
1496 | { FDRIVE_DRV_288, 36, 80, 1, }, | |
1497 | { FDRIVE_DRV_288, 39, 80, 1, }, | |
1498 | { FDRIVE_DRV_288, 40, 80, 1, }, | |
1499 | { FDRIVE_DRV_288, 44, 80, 1, }, | |
1500 | { FDRIVE_DRV_288, 48, 80, 1, }, | |
1501 | /* 720 kB 3"1/2 floppy disks */ | |
1502 | { FDRIVE_DRV_144, 9, 80, 1, }, | |
1503 | { FDRIVE_DRV_144, 10, 80, 1, }, | |
1504 | { FDRIVE_DRV_144, 10, 82, 1, }, | |
1505 | { FDRIVE_DRV_144, 10, 83, 1, }, | |
1506 | { FDRIVE_DRV_144, 13, 80, 1, }, | |
1507 | { FDRIVE_DRV_144, 14, 80, 1, }, | |
1508 | /* 1.2 MB 5"1/4 floppy disks */ | |
1509 | { FDRIVE_DRV_120, 15, 80, 1, }, | |
1510 | { FDRIVE_DRV_120, 18, 80, 1, }, | |
1511 | { FDRIVE_DRV_120, 18, 82, 1, }, | |
1512 | { FDRIVE_DRV_120, 18, 83, 1, }, | |
1513 | { FDRIVE_DRV_120, 20, 80, 1, }, | |
1514 | /* 720 kB 5"1/4 floppy disks */ | |
1515 | { FDRIVE_DRV_120, 9, 80, 1, }, | |
1516 | { FDRIVE_DRV_120, 11, 80, 1, }, | |
1517 | /* 360 kB 5"1/4 floppy disks */ | |
1518 | { FDRIVE_DRV_120, 9, 40, 1, }, | |
1519 | { FDRIVE_DRV_120, 9, 40, 0, }, | |
1520 | { FDRIVE_DRV_120, 10, 41, 1, }, | |
1521 | { FDRIVE_DRV_120, 10, 42, 1, }, | |
1522 | /* 320 kB 5"1/4 floppy disks */ | |
1523 | { FDRIVE_DRV_120, 8, 40, 1, }, | |
1524 | { FDRIVE_DRV_120, 8, 40, 0, }, | |
1525 | /* 360 kB must match 5"1/4 better than 3"1/2... */ | |
1526 | { FDRIVE_DRV_144, 9, 80, 0, }, | |
1527 | /* end */ | |
1528 | { FDRIVE_DRV_NONE, -1, -1, 0, }, | |
1529 | }; | |
1530 | ||
1531 | void bdrv_get_floppy_geometry_hint(BlockDriverState *bs, int *nb_heads, | |
1532 | int *max_track, int *last_sect, | |
1533 | FDriveType drive_in, FDriveType *drive) | |
1534 | { | |
1535 | const FDFormat *parse; | |
1536 | uint64_t nb_sectors, size; | |
1537 | int i, first_match, match; | |
1538 | ||
1539 | bdrv_get_geometry_hint(bs, nb_heads, max_track, last_sect); | |
1540 | if (*nb_heads != 0 && *max_track != 0 && *last_sect != 0) { | |
1541 | /* User defined disk */ | |
1542 | } else { | |
1543 | bdrv_get_geometry(bs, &nb_sectors); | |
1544 | match = -1; | |
1545 | first_match = -1; | |
1546 | for (i = 0; ; i++) { | |
1547 | parse = &fd_formats[i]; | |
1548 | if (parse->drive == FDRIVE_DRV_NONE) { | |
1549 | break; | |
1550 | } | |
1551 | if (drive_in == parse->drive || | |
1552 | drive_in == FDRIVE_DRV_NONE) { | |
1553 | size = (parse->max_head + 1) * parse->max_track * | |
1554 | parse->last_sect; | |
1555 | if (nb_sectors == size) { | |
1556 | match = i; | |
1557 | break; | |
1558 | } | |
1559 | if (first_match == -1) { | |
1560 | first_match = i; | |
1561 | } | |
1562 | } | |
1563 | } | |
1564 | if (match == -1) { | |
1565 | if (first_match == -1) { | |
1566 | match = 1; | |
1567 | } else { | |
1568 | match = first_match; | |
1569 | } | |
1570 | parse = &fd_formats[match]; | |
1571 | } | |
1572 | *nb_heads = parse->max_head + 1; | |
1573 | *max_track = parse->max_track; | |
1574 | *last_sect = parse->last_sect; | |
1575 | *drive = parse->drive; | |
1576 | } | |
1577 | } | |
1578 | ||
1579 | int bdrv_get_translation_hint(BlockDriverState *bs) | |
1580 | { | |
1581 | return bs->translation; | |
1582 | } | |
1583 | ||
1584 | void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error, | |
1585 | BlockErrorAction on_write_error) | |
1586 | { | |
1587 | bs->on_read_error = on_read_error; | |
1588 | bs->on_write_error = on_write_error; | |
1589 | } | |
1590 | ||
1591 | BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read) | |
1592 | { | |
1593 | return is_read ? bs->on_read_error : bs->on_write_error; | |
1594 | } | |
1595 | ||
1596 | void bdrv_set_removable(BlockDriverState *bs, int removable) | |
1597 | { | |
1598 | bs->removable = removable; | |
1599 | if (removable && bs == bs_snapshots) { | |
1600 | bs_snapshots = NULL; | |
1601 | } | |
1602 | } | |
1603 | ||
1604 | int bdrv_is_removable(BlockDriverState *bs) | |
1605 | { | |
1606 | return bs->removable; | |
1607 | } | |
1608 | ||
1609 | int bdrv_is_read_only(BlockDriverState *bs) | |
1610 | { | |
1611 | return bs->read_only; | |
1612 | } | |
1613 | ||
1614 | int bdrv_is_sg(BlockDriverState *bs) | |
1615 | { | |
1616 | return bs->sg; | |
1617 | } | |
1618 | ||
1619 | int bdrv_enable_write_cache(BlockDriverState *bs) | |
1620 | { | |
1621 | return bs->enable_write_cache; | |
1622 | } | |
1623 | ||
1624 | int bdrv_is_encrypted(BlockDriverState *bs) | |
1625 | { | |
1626 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
1627 | return 1; | |
1628 | return bs->encrypted; | |
1629 | } | |
1630 | ||
1631 | int bdrv_key_required(BlockDriverState *bs) | |
1632 | { | |
1633 | BlockDriverState *backing_hd = bs->backing_hd; | |
1634 | ||
1635 | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key) | |
1636 | return 1; | |
1637 | return (bs->encrypted && !bs->valid_key); | |
1638 | } | |
1639 | ||
1640 | int bdrv_set_key(BlockDriverState *bs, const char *key) | |
1641 | { | |
1642 | int ret; | |
1643 | if (bs->backing_hd && bs->backing_hd->encrypted) { | |
1644 | ret = bdrv_set_key(bs->backing_hd, key); | |
1645 | if (ret < 0) | |
1646 | return ret; | |
1647 | if (!bs->encrypted) | |
1648 | return 0; | |
1649 | } | |
1650 | if (!bs->encrypted) { | |
1651 | return -EINVAL; | |
1652 | } else if (!bs->drv || !bs->drv->bdrv_set_key) { | |
1653 | return -ENOMEDIUM; | |
1654 | } | |
1655 | ret = bs->drv->bdrv_set_key(bs, key); | |
1656 | if (ret < 0) { | |
1657 | bs->valid_key = 0; | |
1658 | } else if (!bs->valid_key) { | |
1659 | bs->valid_key = 1; | |
1660 | /* call the change callback now, we skipped it on open */ | |
1661 | bs->media_changed = 1; | |
1662 | bdrv_dev_change_cb(bs, CHANGE_MEDIA); | |
1663 | } | |
1664 | return ret; | |
1665 | } | |
1666 | ||
1667 | void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) | |
1668 | { | |
1669 | if (!bs->drv) { | |
1670 | buf[0] = '\0'; | |
1671 | } else { | |
1672 | pstrcpy(buf, buf_size, bs->drv->format_name); | |
1673 | } | |
1674 | } | |
1675 | ||
1676 | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), | |
1677 | void *opaque) | |
1678 | { | |
1679 | BlockDriver *drv; | |
1680 | ||
1681 | QLIST_FOREACH(drv, &bdrv_drivers, list) { | |
1682 | it(opaque, drv->format_name); | |
1683 | } | |
1684 | } | |
1685 | ||
1686 | BlockDriverState *bdrv_find(const char *name) | |
1687 | { | |
1688 | BlockDriverState *bs; | |
1689 | ||
1690 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1691 | if (!strcmp(name, bs->device_name)) { | |
1692 | return bs; | |
1693 | } | |
1694 | } | |
1695 | return NULL; | |
1696 | } | |
1697 | ||
1698 | BlockDriverState *bdrv_next(BlockDriverState *bs) | |
1699 | { | |
1700 | if (!bs) { | |
1701 | return QTAILQ_FIRST(&bdrv_states); | |
1702 | } | |
1703 | return QTAILQ_NEXT(bs, list); | |
1704 | } | |
1705 | ||
1706 | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) | |
1707 | { | |
1708 | BlockDriverState *bs; | |
1709 | ||
1710 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1711 | it(opaque, bs); | |
1712 | } | |
1713 | } | |
1714 | ||
1715 | const char *bdrv_get_device_name(BlockDriverState *bs) | |
1716 | { | |
1717 | return bs->device_name; | |
1718 | } | |
1719 | ||
1720 | int bdrv_flush(BlockDriverState *bs) | |
1721 | { | |
1722 | if (bs->open_flags & BDRV_O_NO_FLUSH) { | |
1723 | return 0; | |
1724 | } | |
1725 | ||
1726 | if (bs->drv && bdrv_has_async_flush(bs->drv) && qemu_in_coroutine()) { | |
1727 | return bdrv_co_flush_em(bs); | |
1728 | } | |
1729 | ||
1730 | if (bs->drv && bs->drv->bdrv_flush) { | |
1731 | return bs->drv->bdrv_flush(bs); | |
1732 | } | |
1733 | ||
1734 | /* | |
1735 | * Some block drivers always operate in either writethrough or unsafe mode | |
1736 | * and don't support bdrv_flush therefore. Usually qemu doesn't know how | |
1737 | * the server works (because the behaviour is hardcoded or depends on | |
1738 | * server-side configuration), so we can't ensure that everything is safe | |
1739 | * on disk. Returning an error doesn't work because that would break guests | |
1740 | * even if the server operates in writethrough mode. | |
1741 | * | |
1742 | * Let's hope the user knows what he's doing. | |
1743 | */ | |
1744 | return 0; | |
1745 | } | |
1746 | ||
1747 | void bdrv_flush_all(void) | |
1748 | { | |
1749 | BlockDriverState *bs; | |
1750 | ||
1751 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1752 | if (bs->drv && !bdrv_is_read_only(bs) && | |
1753 | (!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) { | |
1754 | bdrv_flush(bs); | |
1755 | } | |
1756 | } | |
1757 | } | |
1758 | ||
1759 | int bdrv_has_zero_init(BlockDriverState *bs) | |
1760 | { | |
1761 | assert(bs->drv); | |
1762 | ||
1763 | if (bs->drv->bdrv_has_zero_init) { | |
1764 | return bs->drv->bdrv_has_zero_init(bs); | |
1765 | } | |
1766 | ||
1767 | return 1; | |
1768 | } | |
1769 | ||
1770 | int bdrv_discard(BlockDriverState *bs, int64_t sector_num, int nb_sectors) | |
1771 | { | |
1772 | if (!bs->drv) { | |
1773 | return -ENOMEDIUM; | |
1774 | } | |
1775 | if (!bs->drv->bdrv_discard) { | |
1776 | return 0; | |
1777 | } | |
1778 | return bs->drv->bdrv_discard(bs, sector_num, nb_sectors); | |
1779 | } | |
1780 | ||
1781 | /* | |
1782 | * Returns true iff the specified sector is present in the disk image. Drivers | |
1783 | * not implementing the functionality are assumed to not support backing files, | |
1784 | * hence all their sectors are reported as allocated. | |
1785 | * | |
1786 | * 'pnum' is set to the number of sectors (including and immediately following | |
1787 | * the specified sector) that are known to be in the same | |
1788 | * allocated/unallocated state. | |
1789 | * | |
1790 | * 'nb_sectors' is the max value 'pnum' should be set to. | |
1791 | */ | |
1792 | int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, | |
1793 | int *pnum) | |
1794 | { | |
1795 | int64_t n; | |
1796 | if (!bs->drv->bdrv_is_allocated) { | |
1797 | if (sector_num >= bs->total_sectors) { | |
1798 | *pnum = 0; | |
1799 | return 0; | |
1800 | } | |
1801 | n = bs->total_sectors - sector_num; | |
1802 | *pnum = (n < nb_sectors) ? (n) : (nb_sectors); | |
1803 | return 1; | |
1804 | } | |
1805 | return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum); | |
1806 | } | |
1807 | ||
1808 | void bdrv_mon_event(const BlockDriverState *bdrv, | |
1809 | BlockMonEventAction action, int is_read) | |
1810 | { | |
1811 | QObject *data; | |
1812 | const char *action_str; | |
1813 | ||
1814 | switch (action) { | |
1815 | case BDRV_ACTION_REPORT: | |
1816 | action_str = "report"; | |
1817 | break; | |
1818 | case BDRV_ACTION_IGNORE: | |
1819 | action_str = "ignore"; | |
1820 | break; | |
1821 | case BDRV_ACTION_STOP: | |
1822 | action_str = "stop"; | |
1823 | break; | |
1824 | default: | |
1825 | abort(); | |
1826 | } | |
1827 | ||
1828 | data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }", | |
1829 | bdrv->device_name, | |
1830 | action_str, | |
1831 | is_read ? "read" : "write"); | |
1832 | monitor_protocol_event(QEVENT_BLOCK_IO_ERROR, data); | |
1833 | ||
1834 | qobject_decref(data); | |
1835 | } | |
1836 | ||
1837 | static void bdrv_print_dict(QObject *obj, void *opaque) | |
1838 | { | |
1839 | QDict *bs_dict; | |
1840 | Monitor *mon = opaque; | |
1841 | ||
1842 | bs_dict = qobject_to_qdict(obj); | |
1843 | ||
1844 | monitor_printf(mon, "%s: removable=%d", | |
1845 | qdict_get_str(bs_dict, "device"), | |
1846 | qdict_get_bool(bs_dict, "removable")); | |
1847 | ||
1848 | if (qdict_get_bool(bs_dict, "removable")) { | |
1849 | monitor_printf(mon, " locked=%d", qdict_get_bool(bs_dict, "locked")); | |
1850 | } | |
1851 | ||
1852 | if (qdict_haskey(bs_dict, "inserted")) { | |
1853 | QDict *qdict = qobject_to_qdict(qdict_get(bs_dict, "inserted")); | |
1854 | ||
1855 | monitor_printf(mon, " file="); | |
1856 | monitor_print_filename(mon, qdict_get_str(qdict, "file")); | |
1857 | if (qdict_haskey(qdict, "backing_file")) { | |
1858 | monitor_printf(mon, " backing_file="); | |
1859 | monitor_print_filename(mon, qdict_get_str(qdict, "backing_file")); | |
1860 | } | |
1861 | monitor_printf(mon, " ro=%d drv=%s encrypted=%d", | |
1862 | qdict_get_bool(qdict, "ro"), | |
1863 | qdict_get_str(qdict, "drv"), | |
1864 | qdict_get_bool(qdict, "encrypted")); | |
1865 | } else { | |
1866 | monitor_printf(mon, " [not inserted]"); | |
1867 | } | |
1868 | ||
1869 | monitor_printf(mon, "\n"); | |
1870 | } | |
1871 | ||
1872 | void bdrv_info_print(Monitor *mon, const QObject *data) | |
1873 | { | |
1874 | qlist_iter(qobject_to_qlist(data), bdrv_print_dict, mon); | |
1875 | } | |
1876 | ||
1877 | void bdrv_info(Monitor *mon, QObject **ret_data) | |
1878 | { | |
1879 | QList *bs_list; | |
1880 | BlockDriverState *bs; | |
1881 | ||
1882 | bs_list = qlist_new(); | |
1883 | ||
1884 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1885 | QObject *bs_obj; | |
1886 | ||
1887 | bs_obj = qobject_from_jsonf("{ 'device': %s, 'type': 'unknown', " | |
1888 | "'removable': %i, 'locked': %i }", | |
1889 | bs->device_name, bs->removable, | |
1890 | bs->locked); | |
1891 | ||
1892 | if (bs->drv) { | |
1893 | QObject *obj; | |
1894 | QDict *bs_dict = qobject_to_qdict(bs_obj); | |
1895 | ||
1896 | obj = qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, " | |
1897 | "'encrypted': %i }", | |
1898 | bs->filename, bs->read_only, | |
1899 | bs->drv->format_name, | |
1900 | bdrv_is_encrypted(bs)); | |
1901 | if (bs->backing_file[0] != '\0') { | |
1902 | QDict *qdict = qobject_to_qdict(obj); | |
1903 | qdict_put(qdict, "backing_file", | |
1904 | qstring_from_str(bs->backing_file)); | |
1905 | } | |
1906 | ||
1907 | qdict_put_obj(bs_dict, "inserted", obj); | |
1908 | } | |
1909 | qlist_append_obj(bs_list, bs_obj); | |
1910 | } | |
1911 | ||
1912 | *ret_data = QOBJECT(bs_list); | |
1913 | } | |
1914 | ||
1915 | static void bdrv_stats_iter(QObject *data, void *opaque) | |
1916 | { | |
1917 | QDict *qdict; | |
1918 | Monitor *mon = opaque; | |
1919 | ||
1920 | qdict = qobject_to_qdict(data); | |
1921 | monitor_printf(mon, "%s:", qdict_get_str(qdict, "device")); | |
1922 | ||
1923 | qdict = qobject_to_qdict(qdict_get(qdict, "stats")); | |
1924 | monitor_printf(mon, " rd_bytes=%" PRId64 | |
1925 | " wr_bytes=%" PRId64 | |
1926 | " rd_operations=%" PRId64 | |
1927 | " wr_operations=%" PRId64 | |
1928 | " flush_operations=%" PRId64 | |
1929 | " wr_total_time_ns=%" PRId64 | |
1930 | " rd_total_time_ns=%" PRId64 | |
1931 | " flush_total_time_ns=%" PRId64 | |
1932 | "\n", | |
1933 | qdict_get_int(qdict, "rd_bytes"), | |
1934 | qdict_get_int(qdict, "wr_bytes"), | |
1935 | qdict_get_int(qdict, "rd_operations"), | |
1936 | qdict_get_int(qdict, "wr_operations"), | |
1937 | qdict_get_int(qdict, "flush_operations"), | |
1938 | qdict_get_int(qdict, "wr_total_time_ns"), | |
1939 | qdict_get_int(qdict, "rd_total_time_ns"), | |
1940 | qdict_get_int(qdict, "flush_total_time_ns")); | |
1941 | } | |
1942 | ||
1943 | void bdrv_stats_print(Monitor *mon, const QObject *data) | |
1944 | { | |
1945 | qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon); | |
1946 | } | |
1947 | ||
1948 | static QObject* bdrv_info_stats_bs(BlockDriverState *bs) | |
1949 | { | |
1950 | QObject *res; | |
1951 | QDict *dict; | |
1952 | ||
1953 | res = qobject_from_jsonf("{ 'stats': {" | |
1954 | "'rd_bytes': %" PRId64 "," | |
1955 | "'wr_bytes': %" PRId64 "," | |
1956 | "'rd_operations': %" PRId64 "," | |
1957 | "'wr_operations': %" PRId64 "," | |
1958 | "'wr_highest_offset': %" PRId64 "," | |
1959 | "'flush_operations': %" PRId64 "," | |
1960 | "'wr_total_time_ns': %" PRId64 "," | |
1961 | "'rd_total_time_ns': %" PRId64 "," | |
1962 | "'flush_total_time_ns': %" PRId64 | |
1963 | "} }", | |
1964 | bs->nr_bytes[BDRV_ACCT_READ], | |
1965 | bs->nr_bytes[BDRV_ACCT_WRITE], | |
1966 | bs->nr_ops[BDRV_ACCT_READ], | |
1967 | bs->nr_ops[BDRV_ACCT_WRITE], | |
1968 | bs->wr_highest_sector * | |
1969 | (uint64_t)BDRV_SECTOR_SIZE, | |
1970 | bs->nr_ops[BDRV_ACCT_FLUSH], | |
1971 | bs->total_time_ns[BDRV_ACCT_WRITE], | |
1972 | bs->total_time_ns[BDRV_ACCT_READ], | |
1973 | bs->total_time_ns[BDRV_ACCT_FLUSH]); | |
1974 | dict = qobject_to_qdict(res); | |
1975 | ||
1976 | if (*bs->device_name) { | |
1977 | qdict_put(dict, "device", qstring_from_str(bs->device_name)); | |
1978 | } | |
1979 | ||
1980 | if (bs->file) { | |
1981 | QObject *parent = bdrv_info_stats_bs(bs->file); | |
1982 | qdict_put_obj(dict, "parent", parent); | |
1983 | } | |
1984 | ||
1985 | return res; | |
1986 | } | |
1987 | ||
1988 | void bdrv_info_stats(Monitor *mon, QObject **ret_data) | |
1989 | { | |
1990 | QObject *obj; | |
1991 | QList *devices; | |
1992 | BlockDriverState *bs; | |
1993 | ||
1994 | devices = qlist_new(); | |
1995 | ||
1996 | QTAILQ_FOREACH(bs, &bdrv_states, list) { | |
1997 | obj = bdrv_info_stats_bs(bs); | |
1998 | qlist_append_obj(devices, obj); | |
1999 | } | |
2000 | ||
2001 | *ret_data = QOBJECT(devices); | |
2002 | } | |
2003 | ||
2004 | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) | |
2005 | { | |
2006 | if (bs->backing_hd && bs->backing_hd->encrypted) | |
2007 | return bs->backing_file; | |
2008 | else if (bs->encrypted) | |
2009 | return bs->filename; | |
2010 | else | |
2011 | return NULL; | |
2012 | } | |
2013 | ||
2014 | void bdrv_get_backing_filename(BlockDriverState *bs, | |
2015 | char *filename, int filename_size) | |
2016 | { | |
2017 | if (!bs->backing_file) { | |
2018 | pstrcpy(filename, filename_size, ""); | |
2019 | } else { | |
2020 | pstrcpy(filename, filename_size, bs->backing_file); | |
2021 | } | |
2022 | } | |
2023 | ||
2024 | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num, | |
2025 | const uint8_t *buf, int nb_sectors) | |
2026 | { | |
2027 | BlockDriver *drv = bs->drv; | |
2028 | if (!drv) | |
2029 | return -ENOMEDIUM; | |
2030 | if (!drv->bdrv_write_compressed) | |
2031 | return -ENOTSUP; | |
2032 | if (bdrv_check_request(bs, sector_num, nb_sectors)) | |
2033 | return -EIO; | |
2034 | ||
2035 | if (bs->dirty_bitmap) { | |
2036 | set_dirty_bitmap(bs, sector_num, nb_sectors, 1); | |
2037 | } | |
2038 | ||
2039 | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors); | |
2040 | } | |
2041 | ||
2042 | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) | |
2043 | { | |
2044 | BlockDriver *drv = bs->drv; | |
2045 | if (!drv) | |
2046 | return -ENOMEDIUM; | |
2047 | if (!drv->bdrv_get_info) | |
2048 | return -ENOTSUP; | |
2049 | memset(bdi, 0, sizeof(*bdi)); | |
2050 | return drv->bdrv_get_info(bs, bdi); | |
2051 | } | |
2052 | ||
2053 | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, | |
2054 | int64_t pos, int size) | |
2055 | { | |
2056 | BlockDriver *drv = bs->drv; | |
2057 | if (!drv) | |
2058 | return -ENOMEDIUM; | |
2059 | if (drv->bdrv_save_vmstate) | |
2060 | return drv->bdrv_save_vmstate(bs, buf, pos, size); | |
2061 | if (bs->file) | |
2062 | return bdrv_save_vmstate(bs->file, buf, pos, size); | |
2063 | return -ENOTSUP; | |
2064 | } | |
2065 | ||
2066 | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf, | |
2067 | int64_t pos, int size) | |
2068 | { | |
2069 | BlockDriver *drv = bs->drv; | |
2070 | if (!drv) | |
2071 | return -ENOMEDIUM; | |
2072 | if (drv->bdrv_load_vmstate) | |
2073 | return drv->bdrv_load_vmstate(bs, buf, pos, size); | |
2074 | if (bs->file) | |
2075 | return bdrv_load_vmstate(bs->file, buf, pos, size); | |
2076 | return -ENOTSUP; | |
2077 | } | |
2078 | ||
2079 | void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event) | |
2080 | { | |
2081 | BlockDriver *drv = bs->drv; | |
2082 | ||
2083 | if (!drv || !drv->bdrv_debug_event) { | |
2084 | return; | |
2085 | } | |
2086 | ||
2087 | return drv->bdrv_debug_event(bs, event); | |
2088 | ||
2089 | } | |
2090 | ||
2091 | /**************************************************************/ | |
2092 | /* handling of snapshots */ | |
2093 | ||
2094 | int bdrv_can_snapshot(BlockDriverState *bs) | |
2095 | { | |
2096 | BlockDriver *drv = bs->drv; | |
2097 | if (!drv || bdrv_is_removable(bs) || bdrv_is_read_only(bs)) { | |
2098 | return 0; | |
2099 | } | |
2100 | ||
2101 | if (!drv->bdrv_snapshot_create) { | |
2102 | if (bs->file != NULL) { | |
2103 | return bdrv_can_snapshot(bs->file); | |
2104 | } | |
2105 | return 0; | |
2106 | } | |
2107 | ||
2108 | return 1; | |
2109 | } | |
2110 | ||
2111 | int bdrv_is_snapshot(BlockDriverState *bs) | |
2112 | { | |
2113 | return !!(bs->open_flags & BDRV_O_SNAPSHOT); | |
2114 | } | |
2115 | ||
2116 | BlockDriverState *bdrv_snapshots(void) | |
2117 | { | |
2118 | BlockDriverState *bs; | |
2119 | ||
2120 | if (bs_snapshots) { | |
2121 | return bs_snapshots; | |
2122 | } | |
2123 | ||
2124 | bs = NULL; | |
2125 | while ((bs = bdrv_next(bs))) { | |
2126 | if (bdrv_can_snapshot(bs)) { | |
2127 | bs_snapshots = bs; | |
2128 | return bs; | |
2129 | } | |
2130 | } | |
2131 | return NULL; | |
2132 | } | |
2133 | ||
2134 | int bdrv_snapshot_create(BlockDriverState *bs, | |
2135 | QEMUSnapshotInfo *sn_info) | |
2136 | { | |
2137 | BlockDriver *drv = bs->drv; | |
2138 | if (!drv) | |
2139 | return -ENOMEDIUM; | |
2140 | if (drv->bdrv_snapshot_create) | |
2141 | return drv->bdrv_snapshot_create(bs, sn_info); | |
2142 | if (bs->file) | |
2143 | return bdrv_snapshot_create(bs->file, sn_info); | |
2144 | return -ENOTSUP; | |
2145 | } | |
2146 | ||
2147 | int bdrv_snapshot_goto(BlockDriverState *bs, | |
2148 | const char *snapshot_id) | |
2149 | { | |
2150 | BlockDriver *drv = bs->drv; | |
2151 | int ret, open_ret; | |
2152 | ||
2153 | if (!drv) | |
2154 | return -ENOMEDIUM; | |
2155 | if (drv->bdrv_snapshot_goto) | |
2156 | return drv->bdrv_snapshot_goto(bs, snapshot_id); | |
2157 | ||
2158 | if (bs->file) { | |
2159 | drv->bdrv_close(bs); | |
2160 | ret = bdrv_snapshot_goto(bs->file, snapshot_id); | |
2161 | open_ret = drv->bdrv_open(bs, bs->open_flags); | |
2162 | if (open_ret < 0) { | |
2163 | bdrv_delete(bs->file); | |
2164 | bs->drv = NULL; | |
2165 | return open_ret; | |
2166 | } | |
2167 | return ret; | |
2168 | } | |
2169 | ||
2170 | return -ENOTSUP; | |
2171 | } | |
2172 | ||
2173 | int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) | |
2174 | { | |
2175 | BlockDriver *drv = bs->drv; | |
2176 | if (!drv) | |
2177 | return -ENOMEDIUM; | |
2178 | if (drv->bdrv_snapshot_delete) | |
2179 | return drv->bdrv_snapshot_delete(bs, snapshot_id); | |
2180 | if (bs->file) | |
2181 | return bdrv_snapshot_delete(bs->file, snapshot_id); | |
2182 | return -ENOTSUP; | |
2183 | } | |
2184 | ||
2185 | int bdrv_snapshot_list(BlockDriverState *bs, | |
2186 | QEMUSnapshotInfo **psn_info) | |
2187 | { | |
2188 | BlockDriver *drv = bs->drv; | |
2189 | if (!drv) | |
2190 | return -ENOMEDIUM; | |
2191 | if (drv->bdrv_snapshot_list) | |
2192 | return drv->bdrv_snapshot_list(bs, psn_info); | |
2193 | if (bs->file) | |
2194 | return bdrv_snapshot_list(bs->file, psn_info); | |
2195 | return -ENOTSUP; | |
2196 | } | |
2197 | ||
2198 | int bdrv_snapshot_load_tmp(BlockDriverState *bs, | |
2199 | const char *snapshot_name) | |
2200 | { | |
2201 | BlockDriver *drv = bs->drv; | |
2202 | if (!drv) { | |
2203 | return -ENOMEDIUM; | |
2204 | } | |
2205 | if (!bs->read_only) { | |
2206 | return -EINVAL; | |
2207 | } | |
2208 | if (drv->bdrv_snapshot_load_tmp) { | |
2209 | return drv->bdrv_snapshot_load_tmp(bs, snapshot_name); | |
2210 | } | |
2211 | return -ENOTSUP; | |
2212 | } | |
2213 | ||
2214 | #define NB_SUFFIXES 4 | |
2215 | ||
2216 | char *get_human_readable_size(char *buf, int buf_size, int64_t size) | |
2217 | { | |
2218 | static const char suffixes[NB_SUFFIXES] = "KMGT"; | |
2219 | int64_t base; | |
2220 | int i; | |
2221 | ||
2222 | if (size <= 999) { | |
2223 | snprintf(buf, buf_size, "%" PRId64, size); | |
2224 | } else { | |
2225 | base = 1024; | |
2226 | for(i = 0; i < NB_SUFFIXES; i++) { | |
2227 | if (size < (10 * base)) { | |
2228 | snprintf(buf, buf_size, "%0.1f%c", | |
2229 | (double)size / base, | |
2230 | suffixes[i]); | |
2231 | break; | |
2232 | } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { | |
2233 | snprintf(buf, buf_size, "%" PRId64 "%c", | |
2234 | ((size + (base >> 1)) / base), | |
2235 | suffixes[i]); | |
2236 | break; | |
2237 | } | |
2238 | base = base * 1024; | |
2239 | } | |
2240 | } | |
2241 | return buf; | |
2242 | } | |
2243 | ||
2244 | char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) | |
2245 | { | |
2246 | char buf1[128], date_buf[128], clock_buf[128]; | |
2247 | #ifdef _WIN32 | |
2248 | struct tm *ptm; | |
2249 | #else | |
2250 | struct tm tm; | |
2251 | #endif | |
2252 | time_t ti; | |
2253 | int64_t secs; | |
2254 | ||
2255 | if (!sn) { | |
2256 | snprintf(buf, buf_size, | |
2257 | "%-10s%-20s%7s%20s%15s", | |
2258 | "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); | |
2259 | } else { | |
2260 | ti = sn->date_sec; | |
2261 | #ifdef _WIN32 | |
2262 | ptm = localtime(&ti); | |
2263 | strftime(date_buf, sizeof(date_buf), | |
2264 | "%Y-%m-%d %H:%M:%S", ptm); | |
2265 | #else | |
2266 | localtime_r(&ti, &tm); | |
2267 | strftime(date_buf, sizeof(date_buf), | |
2268 | "%Y-%m-%d %H:%M:%S", &tm); | |
2269 | #endif | |
2270 | secs = sn->vm_clock_nsec / 1000000000; | |
2271 | snprintf(clock_buf, sizeof(clock_buf), | |
2272 | "%02d:%02d:%02d.%03d", | |
2273 | (int)(secs / 3600), | |
2274 | (int)((secs / 60) % 60), | |
2275 | (int)(secs % 60), | |
2276 | (int)((sn->vm_clock_nsec / 1000000) % 1000)); | |
2277 | snprintf(buf, buf_size, | |
2278 | "%-10s%-20s%7s%20s%15s", | |
2279 | sn->id_str, sn->name, | |
2280 | get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), | |
2281 | date_buf, | |
2282 | clock_buf); | |
2283 | } | |
2284 | return buf; | |
2285 | } | |
2286 | ||
2287 | /**************************************************************/ | |
2288 | /* async I/Os */ | |
2289 | ||
2290 | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, | |
2291 | QEMUIOVector *qiov, int nb_sectors, | |
2292 | BlockDriverCompletionFunc *cb, void *opaque) | |
2293 | { | |
2294 | BlockDriver *drv = bs->drv; | |
2295 | ||
2296 | trace_bdrv_aio_readv(bs, sector_num, nb_sectors, opaque); | |
2297 | ||
2298 | if (!drv) | |
2299 | return NULL; | |
2300 | if (bdrv_check_request(bs, sector_num, nb_sectors)) | |
2301 | return NULL; | |
2302 | ||
2303 | return drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors, | |
2304 | cb, opaque); | |
2305 | } | |
2306 | ||
2307 | typedef struct BlockCompleteData { | |
2308 | BlockDriverCompletionFunc *cb; | |
2309 | void *opaque; | |
2310 | BlockDriverState *bs; | |
2311 | int64_t sector_num; | |
2312 | int nb_sectors; | |
2313 | } BlockCompleteData; | |
2314 | ||
2315 | static void block_complete_cb(void *opaque, int ret) | |
2316 | { | |
2317 | BlockCompleteData *b = opaque; | |
2318 | ||
2319 | if (b->bs->dirty_bitmap) { | |
2320 | set_dirty_bitmap(b->bs, b->sector_num, b->nb_sectors, 1); | |
2321 | } | |
2322 | b->cb(b->opaque, ret); | |
2323 | g_free(b); | |
2324 | } | |
2325 | ||
2326 | static BlockCompleteData *blk_dirty_cb_alloc(BlockDriverState *bs, | |
2327 | int64_t sector_num, | |
2328 | int nb_sectors, | |
2329 | BlockDriverCompletionFunc *cb, | |
2330 | void *opaque) | |
2331 | { | |
2332 | BlockCompleteData *blkdata = g_malloc0(sizeof(BlockCompleteData)); | |
2333 | ||
2334 | blkdata->bs = bs; | |
2335 | blkdata->cb = cb; | |
2336 | blkdata->opaque = opaque; | |
2337 | blkdata->sector_num = sector_num; | |
2338 | blkdata->nb_sectors = nb_sectors; | |
2339 | ||
2340 | return blkdata; | |
2341 | } | |
2342 | ||
2343 | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, | |
2344 | QEMUIOVector *qiov, int nb_sectors, | |
2345 | BlockDriverCompletionFunc *cb, void *opaque) | |
2346 | { | |
2347 | BlockDriver *drv = bs->drv; | |
2348 | BlockDriverAIOCB *ret; | |
2349 | BlockCompleteData *blk_cb_data; | |
2350 | ||
2351 | trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque); | |
2352 | ||
2353 | if (!drv) | |
2354 | return NULL; | |
2355 | if (bs->read_only) | |
2356 | return NULL; | |
2357 | if (bdrv_check_request(bs, sector_num, nb_sectors)) | |
2358 | return NULL; | |
2359 | ||
2360 | if (bs->dirty_bitmap) { | |
2361 | blk_cb_data = blk_dirty_cb_alloc(bs, sector_num, nb_sectors, cb, | |
2362 | opaque); | |
2363 | cb = &block_complete_cb; | |
2364 | opaque = blk_cb_data; | |
2365 | } | |
2366 | ||
2367 | ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors, | |
2368 | cb, opaque); | |
2369 | ||
2370 | if (ret) { | |
2371 | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { | |
2372 | bs->wr_highest_sector = sector_num + nb_sectors - 1; | |
2373 | } | |
2374 | } | |
2375 | ||
2376 | return ret; | |
2377 | } | |
2378 | ||
2379 | ||
2380 | typedef struct MultiwriteCB { | |
2381 | int error; | |
2382 | int num_requests; | |
2383 | int num_callbacks; | |
2384 | struct { | |
2385 | BlockDriverCompletionFunc *cb; | |
2386 | void *opaque; | |
2387 | QEMUIOVector *free_qiov; | |
2388 | void *free_buf; | |
2389 | } callbacks[]; | |
2390 | } MultiwriteCB; | |
2391 | ||
2392 | static void multiwrite_user_cb(MultiwriteCB *mcb) | |
2393 | { | |
2394 | int i; | |
2395 | ||
2396 | for (i = 0; i < mcb->num_callbacks; i++) { | |
2397 | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); | |
2398 | if (mcb->callbacks[i].free_qiov) { | |
2399 | qemu_iovec_destroy(mcb->callbacks[i].free_qiov); | |
2400 | } | |
2401 | g_free(mcb->callbacks[i].free_qiov); | |
2402 | qemu_vfree(mcb->callbacks[i].free_buf); | |
2403 | } | |
2404 | } | |
2405 | ||
2406 | static void multiwrite_cb(void *opaque, int ret) | |
2407 | { | |
2408 | MultiwriteCB *mcb = opaque; | |
2409 | ||
2410 | trace_multiwrite_cb(mcb, ret); | |
2411 | ||
2412 | if (ret < 0 && !mcb->error) { | |
2413 | mcb->error = ret; | |
2414 | } | |
2415 | ||
2416 | mcb->num_requests--; | |
2417 | if (mcb->num_requests == 0) { | |
2418 | multiwrite_user_cb(mcb); | |
2419 | g_free(mcb); | |
2420 | } | |
2421 | } | |
2422 | ||
2423 | static int multiwrite_req_compare(const void *a, const void *b) | |
2424 | { | |
2425 | const BlockRequest *req1 = a, *req2 = b; | |
2426 | ||
2427 | /* | |
2428 | * Note that we can't simply subtract req2->sector from req1->sector | |
2429 | * here as that could overflow the return value. | |
2430 | */ | |
2431 | if (req1->sector > req2->sector) { | |
2432 | return 1; | |
2433 | } else if (req1->sector < req2->sector) { | |
2434 | return -1; | |
2435 | } else { | |
2436 | return 0; | |
2437 | } | |
2438 | } | |
2439 | ||
2440 | /* | |
2441 | * Takes a bunch of requests and tries to merge them. Returns the number of | |
2442 | * requests that remain after merging. | |
2443 | */ | |
2444 | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, | |
2445 | int num_reqs, MultiwriteCB *mcb) | |
2446 | { | |
2447 | int i, outidx; | |
2448 | ||
2449 | // Sort requests by start sector | |
2450 | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare); | |
2451 | ||
2452 | // Check if adjacent requests touch the same clusters. If so, combine them, | |
2453 | // filling up gaps with zero sectors. | |
2454 | outidx = 0; | |
2455 | for (i = 1; i < num_reqs; i++) { | |
2456 | int merge = 0; | |
2457 | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; | |
2458 | ||
2459 | // This handles the cases that are valid for all block drivers, namely | |
2460 | // exactly sequential writes and overlapping writes. | |
2461 | if (reqs[i].sector <= oldreq_last) { | |
2462 | merge = 1; | |
2463 | } | |
2464 | ||
2465 | // The block driver may decide that it makes sense to combine requests | |
2466 | // even if there is a gap of some sectors between them. In this case, | |
2467 | // the gap is filled with zeros (therefore only applicable for yet | |
2468 | // unused space in format like qcow2). | |
2469 | if (!merge && bs->drv->bdrv_merge_requests) { | |
2470 | merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]); | |
2471 | } | |
2472 | ||
2473 | if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { | |
2474 | merge = 0; | |
2475 | } | |
2476 | ||
2477 | if (merge) { | |
2478 | size_t size; | |
2479 | QEMUIOVector *qiov = g_malloc0(sizeof(*qiov)); | |
2480 | qemu_iovec_init(qiov, | |
2481 | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1); | |
2482 | ||
2483 | // Add the first request to the merged one. If the requests are | |
2484 | // overlapping, drop the last sectors of the first request. | |
2485 | size = (reqs[i].sector - reqs[outidx].sector) << 9; | |
2486 | qemu_iovec_concat(qiov, reqs[outidx].qiov, size); | |
2487 | ||
2488 | // We might need to add some zeros between the two requests | |
2489 | if (reqs[i].sector > oldreq_last) { | |
2490 | size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9; | |
2491 | uint8_t *buf = qemu_blockalign(bs, zero_bytes); | |
2492 | memset(buf, 0, zero_bytes); | |
2493 | qemu_iovec_add(qiov, buf, zero_bytes); | |
2494 | mcb->callbacks[i].free_buf = buf; | |
2495 | } | |
2496 | ||
2497 | // Add the second request | |
2498 | qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size); | |
2499 | ||
2500 | reqs[outidx].nb_sectors = qiov->size >> 9; | |
2501 | reqs[outidx].qiov = qiov; | |
2502 | ||
2503 | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; | |
2504 | } else { | |
2505 | outidx++; | |
2506 | reqs[outidx].sector = reqs[i].sector; | |
2507 | reqs[outidx].nb_sectors = reqs[i].nb_sectors; | |
2508 | reqs[outidx].qiov = reqs[i].qiov; | |
2509 | } | |
2510 | } | |
2511 | ||
2512 | return outidx + 1; | |
2513 | } | |
2514 | ||
2515 | /* | |
2516 | * Submit multiple AIO write requests at once. | |
2517 | * | |
2518 | * On success, the function returns 0 and all requests in the reqs array have | |
2519 | * been submitted. In error case this function returns -1, and any of the | |
2520 | * requests may or may not be submitted yet. In particular, this means that the | |
2521 | * callback will be called for some of the requests, for others it won't. The | |
2522 | * caller must check the error field of the BlockRequest to wait for the right | |
2523 | * callbacks (if error != 0, no callback will be called). | |
2524 | * | |
2525 | * The implementation may modify the contents of the reqs array, e.g. to merge | |
2526 | * requests. However, the fields opaque and error are left unmodified as they | |
2527 | * are used to signal failure for a single request to the caller. | |
2528 | */ | |
2529 | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) | |
2530 | { | |
2531 | BlockDriverAIOCB *acb; | |
2532 | MultiwriteCB *mcb; | |
2533 | int i; | |
2534 | ||
2535 | /* don't submit writes if we don't have a medium */ | |
2536 | if (bs->drv == NULL) { | |
2537 | for (i = 0; i < num_reqs; i++) { | |
2538 | reqs[i].error = -ENOMEDIUM; | |
2539 | } | |
2540 | return -1; | |
2541 | } | |
2542 | ||
2543 | if (num_reqs == 0) { | |
2544 | return 0; | |
2545 | } | |
2546 | ||
2547 | // Create MultiwriteCB structure | |
2548 | mcb = g_malloc0(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); | |
2549 | mcb->num_requests = 0; | |
2550 | mcb->num_callbacks = num_reqs; | |
2551 | ||
2552 | for (i = 0; i < num_reqs; i++) { | |
2553 | mcb->callbacks[i].cb = reqs[i].cb; | |
2554 | mcb->callbacks[i].opaque = reqs[i].opaque; | |
2555 | } | |
2556 | ||
2557 | // Check for mergable requests | |
2558 | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); | |
2559 | ||
2560 | trace_bdrv_aio_multiwrite(mcb, mcb->num_callbacks, num_reqs); | |
2561 | ||
2562 | /* | |
2563 | * Run the aio requests. As soon as one request can't be submitted | |
2564 | * successfully, fail all requests that are not yet submitted (we must | |
2565 | * return failure for all requests anyway) | |
2566 | * | |
2567 | * num_requests cannot be set to the right value immediately: If | |
2568 | * bdrv_aio_writev fails for some request, num_requests would be too high | |
2569 | * and therefore multiwrite_cb() would never recognize the multiwrite | |
2570 | * request as completed. We also cannot use the loop variable i to set it | |
2571 | * when the first request fails because the callback may already have been | |
2572 | * called for previously submitted requests. Thus, num_requests must be | |
2573 | * incremented for each request that is submitted. | |
2574 | * | |
2575 | * The problem that callbacks may be called early also means that we need | |
2576 | * to take care that num_requests doesn't become 0 before all requests are | |
2577 | * submitted - multiwrite_cb() would consider the multiwrite request | |
2578 | * completed. A dummy request that is "completed" by a manual call to | |
2579 | * multiwrite_cb() takes care of this. | |
2580 | */ | |
2581 | mcb->num_requests = 1; | |
2582 | ||
2583 | // Run the aio requests | |
2584 | for (i = 0; i < num_reqs; i++) { | |
2585 | mcb->num_requests++; | |
2586 | acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, | |
2587 | reqs[i].nb_sectors, multiwrite_cb, mcb); | |
2588 | ||
2589 | if (acb == NULL) { | |
2590 | // We can only fail the whole thing if no request has been | |
2591 | // submitted yet. Otherwise we'll wait for the submitted AIOs to | |
2592 | // complete and report the error in the callback. | |
2593 | if (i == 0) { | |
2594 | trace_bdrv_aio_multiwrite_earlyfail(mcb); | |
2595 | goto fail; | |
2596 | } else { | |
2597 | trace_bdrv_aio_multiwrite_latefail(mcb, i); | |
2598 | multiwrite_cb(mcb, -EIO); | |
2599 | break; | |
2600 | } | |
2601 | } | |
2602 | } | |
2603 | ||
2604 | /* Complete the dummy request */ | |
2605 | multiwrite_cb(mcb, 0); | |
2606 | ||
2607 | return 0; | |
2608 | ||
2609 | fail: | |
2610 | for (i = 0; i < mcb->num_callbacks; i++) { | |
2611 | reqs[i].error = -EIO; | |
2612 | } | |
2613 | g_free(mcb); | |
2614 | return -1; | |
2615 | } | |
2616 | ||
2617 | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, | |
2618 | BlockDriverCompletionFunc *cb, void *opaque) | |
2619 | { | |
2620 | BlockDriver *drv = bs->drv; | |
2621 | ||
2622 | trace_bdrv_aio_flush(bs, opaque); | |
2623 | ||
2624 | if (bs->open_flags & BDRV_O_NO_FLUSH) { | |
2625 | return bdrv_aio_noop_em(bs, cb, opaque); | |
2626 | } | |
2627 | ||
2628 | if (!drv) | |
2629 | return NULL; | |
2630 | return drv->bdrv_aio_flush(bs, cb, opaque); | |
2631 | } | |
2632 | ||
2633 | void bdrv_aio_cancel(BlockDriverAIOCB *acb) | |
2634 | { | |
2635 | acb->pool->cancel(acb); | |
2636 | } | |
2637 | ||
2638 | ||
2639 | /**************************************************************/ | |
2640 | /* async block device emulation */ | |
2641 | ||
2642 | typedef struct BlockDriverAIOCBSync { | |
2643 | BlockDriverAIOCB common; | |
2644 | QEMUBH *bh; | |
2645 | int ret; | |
2646 | /* vector translation state */ | |
2647 | QEMUIOVector *qiov; | |
2648 | uint8_t *bounce; | |
2649 | int is_write; | |
2650 | } BlockDriverAIOCBSync; | |
2651 | ||
2652 | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) | |
2653 | { | |
2654 | BlockDriverAIOCBSync *acb = | |
2655 | container_of(blockacb, BlockDriverAIOCBSync, common); | |
2656 | qemu_bh_delete(acb->bh); | |
2657 | acb->bh = NULL; | |
2658 | qemu_aio_release(acb); | |
2659 | } | |
2660 | ||
2661 | static AIOPool bdrv_em_aio_pool = { | |
2662 | .aiocb_size = sizeof(BlockDriverAIOCBSync), | |
2663 | .cancel = bdrv_aio_cancel_em, | |
2664 | }; | |
2665 | ||
2666 | static void bdrv_aio_bh_cb(void *opaque) | |
2667 | { | |
2668 | BlockDriverAIOCBSync *acb = opaque; | |
2669 | ||
2670 | if (!acb->is_write) | |
2671 | qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); | |
2672 | qemu_vfree(acb->bounce); | |
2673 | acb->common.cb(acb->common.opaque, acb->ret); | |
2674 | qemu_bh_delete(acb->bh); | |
2675 | acb->bh = NULL; | |
2676 | qemu_aio_release(acb); | |
2677 | } | |
2678 | ||
2679 | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs, | |
2680 | int64_t sector_num, | |
2681 | QEMUIOVector *qiov, | |
2682 | int nb_sectors, | |
2683 | BlockDriverCompletionFunc *cb, | |
2684 | void *opaque, | |
2685 | int is_write) | |
2686 | ||
2687 | { | |
2688 | BlockDriverAIOCBSync *acb; | |
2689 | ||
2690 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); | |
2691 | acb->is_write = is_write; | |
2692 | acb->qiov = qiov; | |
2693 | acb->bounce = qemu_blockalign(bs, qiov->size); | |
2694 | ||
2695 | if (!acb->bh) | |
2696 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
2697 | ||
2698 | if (is_write) { | |
2699 | qemu_iovec_to_buffer(acb->qiov, acb->bounce); | |
2700 | acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors); | |
2701 | } else { | |
2702 | acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors); | |
2703 | } | |
2704 | ||
2705 | qemu_bh_schedule(acb->bh); | |
2706 | ||
2707 | return &acb->common; | |
2708 | } | |
2709 | ||
2710 | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs, | |
2711 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
2712 | BlockDriverCompletionFunc *cb, void *opaque) | |
2713 | { | |
2714 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); | |
2715 | } | |
2716 | ||
2717 | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, | |
2718 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
2719 | BlockDriverCompletionFunc *cb, void *opaque) | |
2720 | { | |
2721 | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); | |
2722 | } | |
2723 | ||
2724 | ||
2725 | typedef struct BlockDriverAIOCBCoroutine { | |
2726 | BlockDriverAIOCB common; | |
2727 | BlockRequest req; | |
2728 | bool is_write; | |
2729 | QEMUBH* bh; | |
2730 | } BlockDriverAIOCBCoroutine; | |
2731 | ||
2732 | static void bdrv_aio_co_cancel_em(BlockDriverAIOCB *blockacb) | |
2733 | { | |
2734 | qemu_aio_flush(); | |
2735 | } | |
2736 | ||
2737 | static AIOPool bdrv_em_co_aio_pool = { | |
2738 | .aiocb_size = sizeof(BlockDriverAIOCBCoroutine), | |
2739 | .cancel = bdrv_aio_co_cancel_em, | |
2740 | }; | |
2741 | ||
2742 | static void bdrv_co_rw_bh(void *opaque) | |
2743 | { | |
2744 | BlockDriverAIOCBCoroutine *acb = opaque; | |
2745 | ||
2746 | acb->common.cb(acb->common.opaque, acb->req.error); | |
2747 | qemu_bh_delete(acb->bh); | |
2748 | qemu_aio_release(acb); | |
2749 | } | |
2750 | ||
2751 | static void coroutine_fn bdrv_co_rw(void *opaque) | |
2752 | { | |
2753 | BlockDriverAIOCBCoroutine *acb = opaque; | |
2754 | BlockDriverState *bs = acb->common.bs; | |
2755 | ||
2756 | if (!acb->is_write) { | |
2757 | acb->req.error = bs->drv->bdrv_co_readv(bs, acb->req.sector, | |
2758 | acb->req.nb_sectors, acb->req.qiov); | |
2759 | } else { | |
2760 | acb->req.error = bs->drv->bdrv_co_writev(bs, acb->req.sector, | |
2761 | acb->req.nb_sectors, acb->req.qiov); | |
2762 | } | |
2763 | ||
2764 | acb->bh = qemu_bh_new(bdrv_co_rw_bh, acb); | |
2765 | qemu_bh_schedule(acb->bh); | |
2766 | } | |
2767 | ||
2768 | static BlockDriverAIOCB *bdrv_co_aio_rw_vector(BlockDriverState *bs, | |
2769 | int64_t sector_num, | |
2770 | QEMUIOVector *qiov, | |
2771 | int nb_sectors, | |
2772 | BlockDriverCompletionFunc *cb, | |
2773 | void *opaque, | |
2774 | bool is_write) | |
2775 | { | |
2776 | Coroutine *co; | |
2777 | BlockDriverAIOCBCoroutine *acb; | |
2778 | ||
2779 | acb = qemu_aio_get(&bdrv_em_co_aio_pool, bs, cb, opaque); | |
2780 | acb->req.sector = sector_num; | |
2781 | acb->req.nb_sectors = nb_sectors; | |
2782 | acb->req.qiov = qiov; | |
2783 | acb->is_write = is_write; | |
2784 | ||
2785 | co = qemu_coroutine_create(bdrv_co_rw); | |
2786 | qemu_coroutine_enter(co, acb); | |
2787 | ||
2788 | return &acb->common; | |
2789 | } | |
2790 | ||
2791 | static BlockDriverAIOCB *bdrv_co_aio_readv_em(BlockDriverState *bs, | |
2792 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
2793 | BlockDriverCompletionFunc *cb, void *opaque) | |
2794 | { | |
2795 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, | |
2796 | false); | |
2797 | } | |
2798 | ||
2799 | static BlockDriverAIOCB *bdrv_co_aio_writev_em(BlockDriverState *bs, | |
2800 | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, | |
2801 | BlockDriverCompletionFunc *cb, void *opaque) | |
2802 | { | |
2803 | return bdrv_co_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, | |
2804 | true); | |
2805 | } | |
2806 | ||
2807 | static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, | |
2808 | BlockDriverCompletionFunc *cb, void *opaque) | |
2809 | { | |
2810 | BlockDriverAIOCBSync *acb; | |
2811 | ||
2812 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); | |
2813 | acb->is_write = 1; /* don't bounce in the completion hadler */ | |
2814 | acb->qiov = NULL; | |
2815 | acb->bounce = NULL; | |
2816 | acb->ret = 0; | |
2817 | ||
2818 | if (!acb->bh) | |
2819 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
2820 | ||
2821 | bdrv_flush(bs); | |
2822 | qemu_bh_schedule(acb->bh); | |
2823 | return &acb->common; | |
2824 | } | |
2825 | ||
2826 | static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs, | |
2827 | BlockDriverCompletionFunc *cb, void *opaque) | |
2828 | { | |
2829 | BlockDriverAIOCBSync *acb; | |
2830 | ||
2831 | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); | |
2832 | acb->is_write = 1; /* don't bounce in the completion handler */ | |
2833 | acb->qiov = NULL; | |
2834 | acb->bounce = NULL; | |
2835 | acb->ret = 0; | |
2836 | ||
2837 | if (!acb->bh) { | |
2838 | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); | |
2839 | } | |
2840 | ||
2841 | qemu_bh_schedule(acb->bh); | |
2842 | return &acb->common; | |
2843 | } | |
2844 | ||
2845 | /**************************************************************/ | |
2846 | /* sync block device emulation */ | |
2847 | ||
2848 | static void bdrv_rw_em_cb(void *opaque, int ret) | |
2849 | { | |
2850 | *(int *)opaque = ret; | |
2851 | } | |
2852 | ||
2853 | #define NOT_DONE 0x7fffffff | |
2854 | ||
2855 | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, | |
2856 | uint8_t *buf, int nb_sectors) | |
2857 | { | |
2858 | int async_ret; | |
2859 | BlockDriverAIOCB *acb; | |
2860 | struct iovec iov; | |
2861 | QEMUIOVector qiov; | |
2862 | ||
2863 | async_ret = NOT_DONE; | |
2864 | iov.iov_base = (void *)buf; | |
2865 | iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE; | |
2866 | qemu_iovec_init_external(&qiov, &iov, 1); | |
2867 | acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors, | |
2868 | bdrv_rw_em_cb, &async_ret); | |
2869 | if (acb == NULL) { | |
2870 | async_ret = -1; | |
2871 | goto fail; | |
2872 | } | |
2873 | ||
2874 | while (async_ret == NOT_DONE) { | |
2875 | qemu_aio_wait(); | |
2876 | } | |
2877 | ||
2878 | ||
2879 | fail: | |
2880 | return async_ret; | |
2881 | } | |
2882 | ||
2883 | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, | |
2884 | const uint8_t *buf, int nb_sectors) | |
2885 | { | |
2886 | int async_ret; | |
2887 | BlockDriverAIOCB *acb; | |
2888 | struct iovec iov; | |
2889 | QEMUIOVector qiov; | |
2890 | ||
2891 | async_ret = NOT_DONE; | |
2892 | iov.iov_base = (void *)buf; | |
2893 | iov.iov_len = nb_sectors * BDRV_SECTOR_SIZE; | |
2894 | qemu_iovec_init_external(&qiov, &iov, 1); | |
2895 | acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors, | |
2896 | bdrv_rw_em_cb, &async_ret); | |
2897 | if (acb == NULL) { | |
2898 | async_ret = -1; | |
2899 | goto fail; | |
2900 | } | |
2901 | while (async_ret == NOT_DONE) { | |
2902 | qemu_aio_wait(); | |
2903 | } | |
2904 | ||
2905 | fail: | |
2906 | return async_ret; | |
2907 | } | |
2908 | ||
2909 | void bdrv_init(void) | |
2910 | { | |
2911 | module_call_init(MODULE_INIT_BLOCK); | |
2912 | } | |
2913 | ||
2914 | void bdrv_init_with_whitelist(void) | |
2915 | { | |
2916 | use_bdrv_whitelist = 1; | |
2917 | bdrv_init(); | |
2918 | } | |
2919 | ||
2920 | void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs, | |
2921 | BlockDriverCompletionFunc *cb, void *opaque) | |
2922 | { | |
2923 | BlockDriverAIOCB *acb; | |
2924 | ||
2925 | if (pool->free_aiocb) { | |
2926 | acb = pool->free_aiocb; | |
2927 | pool->free_aiocb = acb->next; | |
2928 | } else { | |
2929 | acb = g_malloc0(pool->aiocb_size); | |
2930 | acb->pool = pool; | |
2931 | } | |
2932 | acb->bs = bs; | |
2933 | acb->cb = cb; | |
2934 | acb->opaque = opaque; | |
2935 | return acb; | |
2936 | } | |
2937 | ||
2938 | void qemu_aio_release(void *p) | |
2939 | { | |
2940 | BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; | |
2941 | AIOPool *pool = acb->pool; | |
2942 | acb->next = pool->free_aiocb; | |
2943 | pool->free_aiocb = acb; | |
2944 | } | |
2945 | ||
2946 | /**************************************************************/ | |
2947 | /* Coroutine block device emulation */ | |
2948 | ||
2949 | typedef struct CoroutineIOCompletion { | |
2950 | Coroutine *coroutine; | |
2951 | int ret; | |
2952 | } CoroutineIOCompletion; | |
2953 | ||
2954 | static void bdrv_co_io_em_complete(void *opaque, int ret) | |
2955 | { | |
2956 | CoroutineIOCompletion *co = opaque; | |
2957 | ||
2958 | co->ret = ret; | |
2959 | qemu_coroutine_enter(co->coroutine, NULL); | |
2960 | } | |
2961 | ||
2962 | static int coroutine_fn bdrv_co_io_em(BlockDriverState *bs, int64_t sector_num, | |
2963 | int nb_sectors, QEMUIOVector *iov, | |
2964 | bool is_write) | |
2965 | { | |
2966 | CoroutineIOCompletion co = { | |
2967 | .coroutine = qemu_coroutine_self(), | |
2968 | }; | |
2969 | BlockDriverAIOCB *acb; | |
2970 | ||
2971 | if (is_write) { | |
2972 | acb = bdrv_aio_writev(bs, sector_num, iov, nb_sectors, | |
2973 | bdrv_co_io_em_complete, &co); | |
2974 | } else { | |
2975 | acb = bdrv_aio_readv(bs, sector_num, iov, nb_sectors, | |
2976 | bdrv_co_io_em_complete, &co); | |
2977 | } | |
2978 | ||
2979 | trace_bdrv_co_io(is_write, acb); | |
2980 | if (!acb) { | |
2981 | return -EIO; | |
2982 | } | |
2983 | qemu_coroutine_yield(); | |
2984 | ||
2985 | return co.ret; | |
2986 | } | |
2987 | ||
2988 | static int coroutine_fn bdrv_co_readv_em(BlockDriverState *bs, | |
2989 | int64_t sector_num, int nb_sectors, | |
2990 | QEMUIOVector *iov) | |
2991 | { | |
2992 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, false); | |
2993 | } | |
2994 | ||
2995 | static int coroutine_fn bdrv_co_writev_em(BlockDriverState *bs, | |
2996 | int64_t sector_num, int nb_sectors, | |
2997 | QEMUIOVector *iov) | |
2998 | { | |
2999 | return bdrv_co_io_em(bs, sector_num, nb_sectors, iov, true); | |
3000 | } | |
3001 | ||
3002 | static int coroutine_fn bdrv_co_flush_em(BlockDriverState *bs) | |
3003 | { | |
3004 | CoroutineIOCompletion co = { | |
3005 | .coroutine = qemu_coroutine_self(), | |
3006 | }; | |
3007 | BlockDriverAIOCB *acb; | |
3008 | ||
3009 | acb = bdrv_aio_flush(bs, bdrv_co_io_em_complete, &co); | |
3010 | if (!acb) { | |
3011 | return -EIO; | |
3012 | } | |
3013 | qemu_coroutine_yield(); | |
3014 | return co.ret; | |
3015 | } | |
3016 | ||
3017 | /**************************************************************/ | |
3018 | /* removable device support */ | |
3019 | ||
3020 | /** | |
3021 | * Return TRUE if the media is present | |
3022 | */ | |
3023 | int bdrv_is_inserted(BlockDriverState *bs) | |
3024 | { | |
3025 | BlockDriver *drv = bs->drv; | |
3026 | int ret; | |
3027 | if (!drv) | |
3028 | return 0; | |
3029 | if (!drv->bdrv_is_inserted) | |
3030 | return !bs->tray_open; | |
3031 | ret = drv->bdrv_is_inserted(bs); | |
3032 | return ret; | |
3033 | } | |
3034 | ||
3035 | /** | |
3036 | * Return TRUE if the media changed since the last call to this | |
3037 | * function. It is currently only used for floppy disks | |
3038 | */ | |
3039 | int bdrv_media_changed(BlockDriverState *bs) | |
3040 | { | |
3041 | BlockDriver *drv = bs->drv; | |
3042 | int ret; | |
3043 | ||
3044 | if (!drv || !drv->bdrv_media_changed) | |
3045 | ret = -ENOTSUP; | |
3046 | else | |
3047 | ret = drv->bdrv_media_changed(bs); | |
3048 | if (ret == -ENOTSUP) | |
3049 | ret = bs->media_changed; | |
3050 | bs->media_changed = 0; | |
3051 | return ret; | |
3052 | } | |
3053 | ||
3054 | /** | |
3055 | * If eject_flag is TRUE, eject the media. Otherwise, close the tray | |
3056 | */ | |
3057 | int bdrv_eject(BlockDriverState *bs, int eject_flag) | |
3058 | { | |
3059 | BlockDriver *drv = bs->drv; | |
3060 | ||
3061 | if (eject_flag && bs->locked) { | |
3062 | return -EBUSY; | |
3063 | } | |
3064 | ||
3065 | if (drv && drv->bdrv_eject) { | |
3066 | drv->bdrv_eject(bs, eject_flag); | |
3067 | } | |
3068 | bs->tray_open = eject_flag; | |
3069 | return 0; | |
3070 | } | |
3071 | ||
3072 | int bdrv_is_locked(BlockDriverState *bs) | |
3073 | { | |
3074 | return bs->locked; | |
3075 | } | |
3076 | ||
3077 | /** | |
3078 | * Lock or unlock the media (if it is locked, the user won't be able | |
3079 | * to eject it manually). | |
3080 | */ | |
3081 | void bdrv_set_locked(BlockDriverState *bs, int locked) | |
3082 | { | |
3083 | BlockDriver *drv = bs->drv; | |
3084 | ||
3085 | trace_bdrv_set_locked(bs, locked); | |
3086 | ||
3087 | bs->locked = locked; | |
3088 | if (drv && drv->bdrv_set_locked) { | |
3089 | drv->bdrv_set_locked(bs, locked); | |
3090 | } | |
3091 | } | |
3092 | ||
3093 | /* needed for generic scsi interface */ | |
3094 | ||
3095 | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) | |
3096 | { | |
3097 | BlockDriver *drv = bs->drv; | |
3098 | ||
3099 | if (drv && drv->bdrv_ioctl) | |
3100 | return drv->bdrv_ioctl(bs, req, buf); | |
3101 | return -ENOTSUP; | |
3102 | } | |
3103 | ||
3104 | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, | |
3105 | unsigned long int req, void *buf, | |
3106 | BlockDriverCompletionFunc *cb, void *opaque) | |
3107 | { | |
3108 | BlockDriver *drv = bs->drv; | |
3109 | ||
3110 | if (drv && drv->bdrv_aio_ioctl) | |
3111 | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque); | |
3112 | return NULL; | |
3113 | } | |
3114 | ||
3115 | ||
3116 | ||
3117 | void *qemu_blockalign(BlockDriverState *bs, size_t size) | |
3118 | { | |
3119 | return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); | |
3120 | } | |
3121 | ||
3122 | void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable) | |
3123 | { | |
3124 | int64_t bitmap_size; | |
3125 | ||
3126 | bs->dirty_count = 0; | |
3127 | if (enable) { | |
3128 | if (!bs->dirty_bitmap) { | |
3129 | bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) + | |
3130 | BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1; | |
3131 | bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8; | |
3132 | ||
3133 | bs->dirty_bitmap = g_malloc0(bitmap_size); | |
3134 | } | |
3135 | } else { | |
3136 | if (bs->dirty_bitmap) { | |
3137 | g_free(bs->dirty_bitmap); | |
3138 | bs->dirty_bitmap = NULL; | |
3139 | } | |
3140 | } | |
3141 | } | |
3142 | ||
3143 | int bdrv_get_dirty(BlockDriverState *bs, int64_t sector) | |
3144 | { | |
3145 | int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; | |
3146 | ||
3147 | if (bs->dirty_bitmap && | |
3148 | (sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) { | |
3149 | return !!(bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] & | |
3150 | (1UL << (chunk % (sizeof(unsigned long) * 8)))); | |
3151 | } else { | |
3152 | return 0; | |
3153 | } | |
3154 | } | |
3155 | ||
3156 | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector, | |
3157 | int nr_sectors) | |
3158 | { | |
3159 | set_dirty_bitmap(bs, cur_sector, nr_sectors, 0); | |
3160 | } | |
3161 | ||
3162 | int64_t bdrv_get_dirty_count(BlockDriverState *bs) | |
3163 | { | |
3164 | return bs->dirty_count; | |
3165 | } | |
3166 | ||
3167 | void bdrv_set_in_use(BlockDriverState *bs, int in_use) | |
3168 | { | |
3169 | assert(bs->in_use != in_use); | |
3170 | bs->in_use = in_use; | |
3171 | } | |
3172 | ||
3173 | int bdrv_in_use(BlockDriverState *bs) | |
3174 | { | |
3175 | return bs->in_use; | |
3176 | } | |
3177 | ||
3178 | void | |
3179 | bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie, int64_t bytes, | |
3180 | enum BlockAcctType type) | |
3181 | { | |
3182 | assert(type < BDRV_MAX_IOTYPE); | |
3183 | ||
3184 | cookie->bytes = bytes; | |
3185 | cookie->start_time_ns = get_clock(); | |
3186 | cookie->type = type; | |
3187 | } | |
3188 | ||
3189 | void | |
3190 | bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie) | |
3191 | { | |
3192 | assert(cookie->type < BDRV_MAX_IOTYPE); | |
3193 | ||
3194 | bs->nr_bytes[cookie->type] += cookie->bytes; | |
3195 | bs->nr_ops[cookie->type]++; | |
3196 | bs->total_time_ns[cookie->type] += get_clock() - cookie->start_time_ns; | |
3197 | } | |
3198 | ||
3199 | int bdrv_img_create(const char *filename, const char *fmt, | |
3200 | const char *base_filename, const char *base_fmt, | |
3201 | char *options, uint64_t img_size, int flags) | |
3202 | { | |
3203 | QEMUOptionParameter *param = NULL, *create_options = NULL; | |
3204 | QEMUOptionParameter *backing_fmt, *backing_file, *size; | |
3205 | BlockDriverState *bs = NULL; | |
3206 | BlockDriver *drv, *proto_drv; | |
3207 | BlockDriver *backing_drv = NULL; | |
3208 | int ret = 0; | |
3209 | ||
3210 | /* Find driver and parse its options */ | |
3211 | drv = bdrv_find_format(fmt); | |
3212 | if (!drv) { | |
3213 | error_report("Unknown file format '%s'", fmt); | |
3214 | ret = -EINVAL; | |
3215 | goto out; | |
3216 | } | |
3217 | ||
3218 | proto_drv = bdrv_find_protocol(filename); | |
3219 | if (!proto_drv) { | |
3220 | error_report("Unknown protocol '%s'", filename); | |
3221 | ret = -EINVAL; | |
3222 | goto out; | |
3223 | } | |
3224 | ||
3225 | create_options = append_option_parameters(create_options, | |
3226 | drv->create_options); | |
3227 | create_options = append_option_parameters(create_options, | |
3228 | proto_drv->create_options); | |
3229 | ||
3230 | /* Create parameter list with default values */ | |
3231 | param = parse_option_parameters("", create_options, param); | |
3232 | ||
3233 | set_option_parameter_int(param, BLOCK_OPT_SIZE, img_size); | |
3234 | ||
3235 | /* Parse -o options */ | |
3236 | if (options) { | |
3237 | param = parse_option_parameters(options, create_options, param); | |
3238 | if (param == NULL) { | |
3239 | error_report("Invalid options for file format '%s'.", fmt); | |
3240 | ret = -EINVAL; | |
3241 | goto out; | |
3242 | } | |
3243 | } | |
3244 | ||
3245 | if (base_filename) { | |
3246 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FILE, | |
3247 | base_filename)) { | |
3248 | error_report("Backing file not supported for file format '%s'", | |
3249 | fmt); | |
3250 | ret = -EINVAL; | |
3251 | goto out; | |
3252 | } | |
3253 | } | |
3254 | ||
3255 | if (base_fmt) { | |
3256 | if (set_option_parameter(param, BLOCK_OPT_BACKING_FMT, base_fmt)) { | |
3257 | error_report("Backing file format not supported for file " | |
3258 | "format '%s'", fmt); | |
3259 | ret = -EINVAL; | |
3260 | goto out; | |
3261 | } | |
3262 | } | |
3263 | ||
3264 | backing_file = get_option_parameter(param, BLOCK_OPT_BACKING_FILE); | |
3265 | if (backing_file && backing_file->value.s) { | |
3266 | if (!strcmp(filename, backing_file->value.s)) { | |
3267 | error_report("Error: Trying to create an image with the " | |
3268 | "same filename as the backing file"); | |
3269 | ret = -EINVAL; | |
3270 | goto out; | |
3271 | } | |
3272 | } | |
3273 | ||
3274 | backing_fmt = get_option_parameter(param, BLOCK_OPT_BACKING_FMT); | |
3275 | if (backing_fmt && backing_fmt->value.s) { | |
3276 | backing_drv = bdrv_find_format(backing_fmt->value.s); | |
3277 | if (!backing_drv) { | |
3278 | error_report("Unknown backing file format '%s'", | |
3279 | backing_fmt->value.s); | |
3280 | ret = -EINVAL; | |
3281 | goto out; | |
3282 | } | |
3283 | } | |
3284 | ||
3285 | // The size for the image must always be specified, with one exception: | |
3286 | // If we are using a backing file, we can obtain the size from there | |
3287 | size = get_option_parameter(param, BLOCK_OPT_SIZE); | |
3288 | if (size && size->value.n == -1) { | |
3289 | if (backing_file && backing_file->value.s) { | |
3290 | uint64_t size; | |
3291 | char buf[32]; | |
3292 | ||
3293 | bs = bdrv_new(""); | |
3294 | ||
3295 | ret = bdrv_open(bs, backing_file->value.s, flags, backing_drv); | |
3296 | if (ret < 0) { | |
3297 | error_report("Could not open '%s'", backing_file->value.s); | |
3298 | goto out; | |
3299 | } | |
3300 | bdrv_get_geometry(bs, &size); | |
3301 | size *= 512; | |
3302 | ||
3303 | snprintf(buf, sizeof(buf), "%" PRId64, size); | |
3304 | set_option_parameter(param, BLOCK_OPT_SIZE, buf); | |
3305 | } else { | |
3306 | error_report("Image creation needs a size parameter"); | |
3307 | ret = -EINVAL; | |
3308 | goto out; | |
3309 | } | |
3310 | } | |
3311 | ||
3312 | printf("Formatting '%s', fmt=%s ", filename, fmt); | |
3313 | print_option_parameters(param); | |
3314 | puts(""); | |
3315 | ||
3316 | ret = bdrv_create(drv, filename, param); | |
3317 | ||
3318 | if (ret < 0) { | |
3319 | if (ret == -ENOTSUP) { | |
3320 | error_report("Formatting or formatting option not supported for " | |
3321 | "file format '%s'", fmt); | |
3322 | } else if (ret == -EFBIG) { | |
3323 | error_report("The image size is too large for file format '%s'", | |
3324 | fmt); | |
3325 | } else { | |
3326 | error_report("%s: error while creating %s: %s", filename, fmt, | |
3327 | strerror(-ret)); | |
3328 | } | |
3329 | } | |
3330 | ||
3331 | out: | |
3332 | free_option_parameters(create_options); | |
3333 | free_option_parameters(param); | |
3334 | ||
3335 | if (bs) { | |
3336 | bdrv_delete(bs); | |
3337 | } | |
3338 | ||
3339 | return ret; | |
3340 | } |