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Merge remote branch 'kwolf/for-anthony' into staging
[qemu/mdroth.git] / block.c
blob39724c17d3a3815e8eb5795812cfcd43875bdc36
1 /*
2 * QEMU System Emulator block driver
3 *
4 * Copyright (c) 2003 Fabrice Bellard
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24 #include "config-host.h"
25 #include "qemu-common.h"
26 #include "monitor.h"
27 #include "block_int.h"
28 #include "module.h"
29 #include "qemu-objects.h"
30
31 #ifdef CONFIG_BSD
32 #include <sys/types.h>
33 #include <sys/stat.h>
34 #include <sys/ioctl.h>
35 #include <sys/queue.h>
36 #ifndef __DragonFly__
37 #include <sys/disk.h>
38 #endif
39 #endif
40
41 #ifdef _WIN32
42 #include <windows.h>
43 #endif
44
45 static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
46 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
47 BlockDriverCompletionFunc *cb, void *opaque);
48 static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
49 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
50 BlockDriverCompletionFunc *cb, void *opaque);
51 static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
52 BlockDriverCompletionFunc *cb, void *opaque);
53 static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs,
54 BlockDriverCompletionFunc *cb, void *opaque);
55 static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
56 uint8_t *buf, int nb_sectors);
57 static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
58 const uint8_t *buf, int nb_sectors);
59
60 static QTAILQ_HEAD(, BlockDriverState) bdrv_states =
61 QTAILQ_HEAD_INITIALIZER(bdrv_states);
62
63 static QLIST_HEAD(, BlockDriver) bdrv_drivers =
64 QLIST_HEAD_INITIALIZER(bdrv_drivers);
65
66 /* If non-zero, use only whitelisted block drivers */
67 static int use_bdrv_whitelist;
68
69 int path_is_absolute(const char *path)
70 {
71 const char *p;
72 #ifdef _WIN32
73 /* specific case for names like: "\\.\d:" */
74 if (*path == '/' || *path == '\\')
75 return 1;
76 #endif
77 p = strchr(path, ':');
78 if (p)
79 p++;
80 else
81 p = path;
82 #ifdef _WIN32
83 return (*p == '/' || *p == '\\');
84 #else
85 return (*p == '/');
86 #endif
87 }
88
89 /* if filename is absolute, just copy it to dest. Otherwise, build a
90 path to it by considering it is relative to base_path. URL are
91 supported. */
92 void path_combine(char *dest, int dest_size,
93 const char *base_path,
94 const char *filename)
95 {
96 const char *p, *p1;
97 int len;
98
99 if (dest_size <= 0)
100 return;
101 if (path_is_absolute(filename)) {
102 pstrcpy(dest, dest_size, filename);
103 } else {
104 p = strchr(base_path, ':');
105 if (p)
106 p++;
107 else
108 p = base_path;
109 p1 = strrchr(base_path, '/');
110 #ifdef _WIN32
111 {
112 const char *p2;
113 p2 = strrchr(base_path, '\\');
114 if (!p1 || p2 > p1)
115 p1 = p2;
116 }
117 #endif
118 if (p1)
119 p1++;
120 else
121 p1 = base_path;
122 if (p1 > p)
123 p = p1;
124 len = p - base_path;
125 if (len > dest_size - 1)
126 len = dest_size - 1;
127 memcpy(dest, base_path, len);
128 dest[len] = '\0';
129 pstrcat(dest, dest_size, filename);
130 }
131 }
132
133 void bdrv_register(BlockDriver *bdrv)
134 {
135 if (!bdrv->bdrv_aio_readv) {
136 /* add AIO emulation layer */
137 bdrv->bdrv_aio_readv = bdrv_aio_readv_em;
138 bdrv->bdrv_aio_writev = bdrv_aio_writev_em;
139 } else if (!bdrv->bdrv_read) {
140 /* add synchronous IO emulation layer */
141 bdrv->bdrv_read = bdrv_read_em;
142 bdrv->bdrv_write = bdrv_write_em;
143 }
144
145 if (!bdrv->bdrv_aio_flush)
146 bdrv->bdrv_aio_flush = bdrv_aio_flush_em;
147
148 QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list);
149 }
150
151 /* create a new block device (by default it is empty) */
152 BlockDriverState *bdrv_new(const char *device_name)
153 {
154 BlockDriverState *bs;
155
156 bs = qemu_mallocz(sizeof(BlockDriverState));
157 pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
158 if (device_name[0] != '\0') {
159 QTAILQ_INSERT_TAIL(&bdrv_states, bs, list);
160 }
161 return bs;
162 }
163
164 BlockDriver *bdrv_find_format(const char *format_name)
165 {
166 BlockDriver *drv1;
167 QLIST_FOREACH(drv1, &bdrv_drivers, list) {
168 if (!strcmp(drv1->format_name, format_name)) {
169 return drv1;
170 }
171 }
172 return NULL;
173 }
174
175 static int bdrv_is_whitelisted(BlockDriver *drv)
176 {
177 static const char *whitelist[] = {
178 CONFIG_BDRV_WHITELIST
179 };
180 const char **p;
181
182 if (!whitelist[0])
183 return 1; /* no whitelist, anything goes */
184
185 for (p = whitelist; *p; p++) {
186 if (!strcmp(drv->format_name, *p)) {
187 return 1;
188 }
189 }
190 return 0;
191 }
192
193 BlockDriver *bdrv_find_whitelisted_format(const char *format_name)
194 {
195 BlockDriver *drv = bdrv_find_format(format_name);
196 return drv && bdrv_is_whitelisted(drv) ? drv : NULL;
197 }
198
199 int bdrv_create(BlockDriver *drv, const char* filename,
200 QEMUOptionParameter *options)
201 {
202 if (!drv->bdrv_create)
203 return -ENOTSUP;
204
205 return drv->bdrv_create(filename, options);
206 }
207
208 int bdrv_create_file(const char* filename, QEMUOptionParameter *options)
209 {
210 BlockDriver *drv;
211
212 drv = bdrv_find_protocol(filename);
213 if (drv == NULL) {
214 drv = bdrv_find_format("file");
215 }
216
217 return bdrv_create(drv, filename, options);
218 }
219
220 #ifdef _WIN32
221 void get_tmp_filename(char *filename, int size)
222 {
223 char temp_dir[MAX_PATH];
224
225 GetTempPath(MAX_PATH, temp_dir);
226 GetTempFileName(temp_dir, "qem", 0, filename);
227 }
228 #else
229 void get_tmp_filename(char *filename, int size)
230 {
231 int fd;
232 const char *tmpdir;
233 /* XXX: race condition possible */
234 tmpdir = getenv("TMPDIR");
235 if (!tmpdir)
236 tmpdir = "/tmp";
237 snprintf(filename, size, "%s/vl.XXXXXX", tmpdir);
238 fd = mkstemp(filename);
239 close(fd);
240 }
241 #endif
242
243 #ifdef _WIN32
244 static int is_windows_drive_prefix(const char *filename)
245 {
246 return (((filename[0] >= 'a' && filename[0] <= 'z') ||
247 (filename[0] >= 'A' && filename[0] <= 'Z')) &&
248 filename[1] == ':');
249 }
250
251 int is_windows_drive(const char *filename)
252 {
253 if (is_windows_drive_prefix(filename) &&
254 filename[2] == '\0')
255 return 1;
256 if (strstart(filename, "\\\\.\\", NULL) ||
257 strstart(filename, "//./", NULL))
258 return 1;
259 return 0;
260 }
261 #endif
262
263 /*
264 * Detect host devices. By convention, /dev/cdrom[N] is always
265 * recognized as a host CDROM.
266 */
267 static BlockDriver *find_hdev_driver(const char *filename)
268 {
269 int score_max = 0, score;
270 BlockDriver *drv = NULL, *d;
271
272 QLIST_FOREACH(d, &bdrv_drivers, list) {
273 if (d->bdrv_probe_device) {
274 score = d->bdrv_probe_device(filename);
275 if (score > score_max) {
276 score_max = score;
277 drv = d;
278 }
279 }
280 }
281
282 return drv;
283 }
284
285 BlockDriver *bdrv_find_protocol(const char *filename)
286 {
287 BlockDriver *drv1;
288 char protocol[128];
289 int len;
290 const char *p;
291 int is_drive;
292
293 /* TODO Drivers without bdrv_file_open must be specified explicitly */
294
295 #ifdef _WIN32
296 is_drive = is_windows_drive(filename) ||
297 is_windows_drive_prefix(filename);
298 #else
299 is_drive = 0;
300 #endif
301 p = strchr(filename, ':');
302 if (!p || is_drive) {
303 drv1 = find_hdev_driver(filename);
304 if (!drv1) {
305 drv1 = bdrv_find_format("file");
306 }
307 return drv1;
308 }
309 len = p - filename;
310 if (len > sizeof(protocol) - 1)
311 len = sizeof(protocol) - 1;
312 memcpy(protocol, filename, len);
313 protocol[len] = '\0';
314 QLIST_FOREACH(drv1, &bdrv_drivers, list) {
315 if (drv1->protocol_name &&
316 !strcmp(drv1->protocol_name, protocol)) {
317 return drv1;
318 }
319 }
320 return NULL;
321 }
322
323 static BlockDriver *find_image_format(const char *filename)
324 {
325 int ret, score, score_max;
326 BlockDriver *drv1, *drv;
327 uint8_t buf[2048];
328 BlockDriverState *bs;
329
330 ret = bdrv_file_open(&bs, filename, 0);
331 if (ret < 0)
332 return NULL;
333
334 /* Return the raw BlockDriver * to scsi-generic devices */
335 if (bs->sg) {
336 bdrv_delete(bs);
337 return bdrv_find_format("raw");
338 }
339
340 ret = bdrv_pread(bs, 0, buf, sizeof(buf));
341 bdrv_delete(bs);
342 if (ret < 0) {
343 return NULL;
344 }
345
346 score_max = 0;
347 drv = NULL;
348 QLIST_FOREACH(drv1, &bdrv_drivers, list) {
349 if (drv1->bdrv_probe) {
350 score = drv1->bdrv_probe(buf, ret, filename);
351 if (score > score_max) {
352 score_max = score;
353 drv = drv1;
354 }
355 }
356 }
357 return drv;
358 }
359
360 /**
361 * Set the current 'total_sectors' value
362 */
363 static int refresh_total_sectors(BlockDriverState *bs, int64_t hint)
364 {
365 BlockDriver *drv = bs->drv;
366
367 /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */
368 if (bs->sg)
369 return 0;
370
371 /* query actual device if possible, otherwise just trust the hint */
372 if (drv->bdrv_getlength) {
373 int64_t length = drv->bdrv_getlength(bs);
374 if (length < 0) {
375 return length;
376 }
377 hint = length >> BDRV_SECTOR_BITS;
378 }
379
380 bs->total_sectors = hint;
381 return 0;
382 }
383
384 /*
385 * Common part for opening disk images and files
386 */
387 static int bdrv_open_common(BlockDriverState *bs, const char *filename,
388 int flags, BlockDriver *drv)
389 {
390 int ret, open_flags;
391
392 assert(drv != NULL);
393
394 bs->file = NULL;
395 bs->total_sectors = 0;
396 bs->is_temporary = 0;
397 bs->encrypted = 0;
398 bs->valid_key = 0;
399 bs->open_flags = flags;
400 /* buffer_alignment defaulted to 512, drivers can change this value */
401 bs->buffer_alignment = 512;
402
403 pstrcpy(bs->filename, sizeof(bs->filename), filename);
404
405 if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) {
406 return -ENOTSUP;
407 }
408
409 bs->drv = drv;
410 bs->opaque = qemu_mallocz(drv->instance_size);
411
412 /*
413 * Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a
414 * write cache to the guest. We do need the fdatasync to flush
415 * out transactions for block allocations, and we maybe have a
416 * volatile write cache in our backing device to deal with.
417 */
418 if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE))
419 bs->enable_write_cache = 1;
420
421 /*
422 * Clear flags that are internal to the block layer before opening the
423 * image.
424 */
425 open_flags = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING);
426
427 /*
428 * Snapshots should be writeable.
429 */
430 if (bs->is_temporary) {
431 open_flags |= BDRV_O_RDWR;
432 }
433
434 /* Open the image, either directly or using a protocol */
435 if (drv->bdrv_file_open) {
436 ret = drv->bdrv_file_open(bs, filename, open_flags);
437 } else {
438 ret = bdrv_file_open(&bs->file, filename, open_flags);
439 if (ret >= 0) {
440 ret = drv->bdrv_open(bs, open_flags);
441 }
442 }
443
444 if (ret < 0) {
445 goto free_and_fail;
446 }
447
448 bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR);
449
450 ret = refresh_total_sectors(bs, bs->total_sectors);
451 if (ret < 0) {
452 goto free_and_fail;
453 }
454
455 #ifndef _WIN32
456 if (bs->is_temporary) {
457 unlink(filename);
458 }
459 #endif
460 return 0;
461
462 free_and_fail:
463 if (bs->file) {
464 bdrv_delete(bs->file);
465 bs->file = NULL;
466 }
467 qemu_free(bs->opaque);
468 bs->opaque = NULL;
469 bs->drv = NULL;
470 return ret;
471 }
472
473 /*
474 * Opens a file using a protocol (file, host_device, nbd, ...)
475 */
476 int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags)
477 {
478 BlockDriverState *bs;
479 BlockDriver *drv;
480 int ret;
481
482 drv = bdrv_find_protocol(filename);
483 if (!drv) {
484 return -ENOENT;
485 }
486
487 bs = bdrv_new("");
488 ret = bdrv_open_common(bs, filename, flags, drv);
489 if (ret < 0) {
490 bdrv_delete(bs);
491 return ret;
492 }
493 bs->growable = 1;
494 *pbs = bs;
495 return 0;
496 }
497
498 /*
499 * Opens a disk image (raw, qcow2, vmdk, ...)
500 */
501 int bdrv_open(BlockDriverState *bs, const char *filename, int flags,
502 BlockDriver *drv)
503 {
504 int ret;
505
506 if (flags & BDRV_O_SNAPSHOT) {
507 BlockDriverState *bs1;
508 int64_t total_size;
509 int is_protocol = 0;
510 BlockDriver *bdrv_qcow2;
511 QEMUOptionParameter *options;
512 char tmp_filename[PATH_MAX];
513 char backing_filename[PATH_MAX];
514
515 /* if snapshot, we create a temporary backing file and open it
516 instead of opening 'filename' directly */
517
518 /* if there is a backing file, use it */
519 bs1 = bdrv_new("");
520 ret = bdrv_open(bs1, filename, 0, drv);
521 if (ret < 0) {
522 bdrv_delete(bs1);
523 return ret;
524 }
525 total_size = bdrv_getlength(bs1) >> BDRV_SECTOR_BITS;
526
527 if (bs1->drv && bs1->drv->protocol_name)
528 is_protocol = 1;
529
530 bdrv_delete(bs1);
531
532 get_tmp_filename(tmp_filename, sizeof(tmp_filename));
533
534 /* Real path is meaningless for protocols */
535 if (is_protocol)
536 snprintf(backing_filename, sizeof(backing_filename),
537 "%s", filename);
538 else if (!realpath(filename, backing_filename))
539 return -errno;
540
541 bdrv_qcow2 = bdrv_find_format("qcow2");
542 options = parse_option_parameters("", bdrv_qcow2->create_options, NULL);
543
544 set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size * 512);
545 set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename);
546 if (drv) {
547 set_option_parameter(options, BLOCK_OPT_BACKING_FMT,
548 drv->format_name);
549 }
550
551 ret = bdrv_create(bdrv_qcow2, tmp_filename, options);
552 free_option_parameters(options);
553 if (ret < 0) {
554 return ret;
555 }
556
557 filename = tmp_filename;
558 drv = bdrv_qcow2;
559 bs->is_temporary = 1;
560 }
561
562 /* Find the right image format driver */
563 if (!drv) {
564 drv = find_image_format(filename);
565 }
566
567 if (!drv) {
568 ret = -ENOENT;
569 goto unlink_and_fail;
570 }
571
572 /* Open the image */
573 ret = bdrv_open_common(bs, filename, flags, drv);
574 if (ret < 0) {
575 goto unlink_and_fail;
576 }
577
578 /* If there is a backing file, use it */
579 if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') {
580 char backing_filename[PATH_MAX];
581 int back_flags;
582 BlockDriver *back_drv = NULL;
583
584 bs->backing_hd = bdrv_new("");
585 path_combine(backing_filename, sizeof(backing_filename),
586 filename, bs->backing_file);
587 if (bs->backing_format[0] != '\0')
588 back_drv = bdrv_find_format(bs->backing_format);
589
590 /* backing files always opened read-only */
591 back_flags =
592 flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING);
593
594 ret = bdrv_open(bs->backing_hd, backing_filename, back_flags, back_drv);
595 if (ret < 0) {
596 bdrv_close(bs);
597 return ret;
598 }
599 if (bs->is_temporary) {
600 bs->backing_hd->keep_read_only = !(flags & BDRV_O_RDWR);
601 } else {
602 /* base image inherits from "parent" */
603 bs->backing_hd->keep_read_only = bs->keep_read_only;
604 }
605 }
606
607 if (!bdrv_key_required(bs)) {
608 /* call the change callback */
609 bs->media_changed = 1;
610 if (bs->change_cb)
611 bs->change_cb(bs->change_opaque);
612 }
613
614 return 0;
615
616 unlink_and_fail:
617 if (bs->is_temporary) {
618 unlink(filename);
619 }
620 return ret;
621 }
622
623 void bdrv_close(BlockDriverState *bs)
624 {
625 if (bs->drv) {
626 if (bs->backing_hd) {
627 bdrv_delete(bs->backing_hd);
628 bs->backing_hd = NULL;
629 }
630 bs->drv->bdrv_close(bs);
631 qemu_free(bs->opaque);
632 #ifdef _WIN32
633 if (bs->is_temporary) {
634 unlink(bs->filename);
635 }
636 #endif
637 bs->opaque = NULL;
638 bs->drv = NULL;
639
640 if (bs->file != NULL) {
641 bdrv_close(bs->file);
642 }
643
644 /* call the change callback */
645 bs->media_changed = 1;
646 if (bs->change_cb)
647 bs->change_cb(bs->change_opaque);
648 }
649 }
650
651 void bdrv_delete(BlockDriverState *bs)
652 {
653 /* remove from list, if necessary */
654 if (bs->device_name[0] != '\0') {
655 QTAILQ_REMOVE(&bdrv_states, bs, list);
656 }
657
658 bdrv_close(bs);
659 if (bs->file != NULL) {
660 bdrv_delete(bs->file);
661 }
662
663 qemu_free(bs);
664 }
665
666 /*
667 * Run consistency checks on an image
668 *
669 * Returns the number of errors or -errno when an internal error occurs
670 */
671 int bdrv_check(BlockDriverState *bs)
672 {
673 if (bs->drv->bdrv_check == NULL) {
674 return -ENOTSUP;
675 }
676
677 return bs->drv->bdrv_check(bs);
678 }
679
680 /* commit COW file into the raw image */
681 int bdrv_commit(BlockDriverState *bs)
682 {
683 BlockDriver *drv = bs->drv;
684 int64_t i, total_sectors;
685 int n, j, ro, open_flags;
686 int ret = 0, rw_ret = 0;
687 unsigned char sector[512];
688 char filename[1024];
689 BlockDriverState *bs_rw, *bs_ro;
690
691 if (!drv)
692 return -ENOMEDIUM;
693
694 if (!bs->backing_hd) {
695 return -ENOTSUP;
696 }
697
698 if (bs->backing_hd->keep_read_only) {
699 return -EACCES;
700 }
701
702 ro = bs->backing_hd->read_only;
703 strncpy(filename, bs->backing_hd->filename, sizeof(filename));
704 open_flags = bs->backing_hd->open_flags;
705
706 if (ro) {
707 /* re-open as RW */
708 bdrv_delete(bs->backing_hd);
709 bs->backing_hd = NULL;
710 bs_rw = bdrv_new("");
711 rw_ret = bdrv_open(bs_rw, filename, open_flags | BDRV_O_RDWR, drv);
712 if (rw_ret < 0) {
713 bdrv_delete(bs_rw);
714 /* try to re-open read-only */
715 bs_ro = bdrv_new("");
716 ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, drv);
717 if (ret < 0) {
718 bdrv_delete(bs_ro);
719 /* drive not functional anymore */
720 bs->drv = NULL;
721 return ret;
722 }
723 bs->backing_hd = bs_ro;
724 return rw_ret;
725 }
726 bs->backing_hd = bs_rw;
727 }
728
729 total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS;
730 for (i = 0; i < total_sectors;) {
731 if (drv->bdrv_is_allocated(bs, i, 65536, &n)) {
732 for(j = 0; j < n; j++) {
733 if (bdrv_read(bs, i, sector, 1) != 0) {
734 ret = -EIO;
735 goto ro_cleanup;
736 }
737
738 if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) {
739 ret = -EIO;
740 goto ro_cleanup;
741 }
742 i++;
743 }
744 } else {
745 i += n;
746 }
747 }
748
749 if (drv->bdrv_make_empty) {
750 ret = drv->bdrv_make_empty(bs);
751 bdrv_flush(bs);
752 }
753
754 /*
755 * Make sure all data we wrote to the backing device is actually
756 * stable on disk.
757 */
758 if (bs->backing_hd)
759 bdrv_flush(bs->backing_hd);
760
761 ro_cleanup:
762
763 if (ro) {
764 /* re-open as RO */
765 bdrv_delete(bs->backing_hd);
766 bs->backing_hd = NULL;
767 bs_ro = bdrv_new("");
768 ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, drv);
769 if (ret < 0) {
770 bdrv_delete(bs_ro);
771 /* drive not functional anymore */
772 bs->drv = NULL;
773 return ret;
774 }
775 bs->backing_hd = bs_ro;
776 bs->backing_hd->keep_read_only = 0;
777 }
778
779 return ret;
780 }
781
782 /*
783 * Return values:
784 * 0 - success
785 * -EINVAL - backing format specified, but no file
786 * -ENOSPC - can't update the backing file because no space is left in the
787 * image file header
788 * -ENOTSUP - format driver doesn't support changing the backing file
789 */
790 int bdrv_change_backing_file(BlockDriverState *bs,
791 const char *backing_file, const char *backing_fmt)
792 {
793 BlockDriver *drv = bs->drv;
794
795 if (drv->bdrv_change_backing_file != NULL) {
796 return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt);
797 } else {
798 return -ENOTSUP;
799 }
800 }
801
802 static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset,
803 size_t size)
804 {
805 int64_t len;
806
807 if (!bdrv_is_inserted(bs))
808 return -ENOMEDIUM;
809
810 if (bs->growable)
811 return 0;
812
813 len = bdrv_getlength(bs);
814
815 if (offset < 0)
816 return -EIO;
817
818 if ((offset > len) || (len - offset < size))
819 return -EIO;
820
821 return 0;
822 }
823
824 static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num,
825 int nb_sectors)
826 {
827 return bdrv_check_byte_request(bs, sector_num * 512, nb_sectors * 512);
828 }
829
830 /* return < 0 if error. See bdrv_write() for the return codes */
831 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
832 uint8_t *buf, int nb_sectors)
833 {
834 BlockDriver *drv = bs->drv;
835
836 if (!drv)
837 return -ENOMEDIUM;
838 if (bdrv_check_request(bs, sector_num, nb_sectors))
839 return -EIO;
840
841 return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
842 }
843
844 static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num,
845 int nb_sectors, int dirty)
846 {
847 int64_t start, end;
848 unsigned long val, idx, bit;
849
850 start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK;
851 end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK;
852
853 for (; start <= end; start++) {
854 idx = start / (sizeof(unsigned long) * 8);
855 bit = start % (sizeof(unsigned long) * 8);
856 val = bs->dirty_bitmap[idx];
857 if (dirty) {
858 if (!(val & (1 << bit))) {
859 bs->dirty_count++;
860 val |= 1 << bit;
861 }
862 } else {
863 if (val & (1 << bit)) {
864 bs->dirty_count--;
865 val &= ~(1 << bit);
866 }
867 }
868 bs->dirty_bitmap[idx] = val;
869 }
870 }
871
872 /* Return < 0 if error. Important errors are:
873 -EIO generic I/O error (may happen for all errors)
874 -ENOMEDIUM No media inserted.
875 -EINVAL Invalid sector number or nb_sectors
876 -EACCES Trying to write a read-only device
877 */
878 int bdrv_write(BlockDriverState *bs, int64_t sector_num,
879 const uint8_t *buf, int nb_sectors)
880 {
881 BlockDriver *drv = bs->drv;
882 if (!bs->drv)
883 return -ENOMEDIUM;
884 if (bs->read_only)
885 return -EACCES;
886 if (bdrv_check_request(bs, sector_num, nb_sectors))
887 return -EIO;
888
889 if (bs->dirty_bitmap) {
890 set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
891 }
892
893 if (bs->wr_highest_sector < sector_num + nb_sectors - 1) {
894 bs->wr_highest_sector = sector_num + nb_sectors - 1;
895 }
896
897 return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
898 }
899
900 int bdrv_pread(BlockDriverState *bs, int64_t offset,
901 void *buf, int count1)
902 {
903 uint8_t tmp_buf[BDRV_SECTOR_SIZE];
904 int len, nb_sectors, count;
905 int64_t sector_num;
906 int ret;
907
908 count = count1;
909 /* first read to align to sector start */
910 len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
911 if (len > count)
912 len = count;
913 sector_num = offset >> BDRV_SECTOR_BITS;
914 if (len > 0) {
915 if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
916 return ret;
917 memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len);
918 count -= len;
919 if (count == 0)
920 return count1;
921 sector_num++;
922 buf += len;
923 }
924
925 /* read the sectors "in place" */
926 nb_sectors = count >> BDRV_SECTOR_BITS;
927 if (nb_sectors > 0) {
928 if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0)
929 return ret;
930 sector_num += nb_sectors;
931 len = nb_sectors << BDRV_SECTOR_BITS;
932 buf += len;
933 count -= len;
934 }
935
936 /* add data from the last sector */
937 if (count > 0) {
938 if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
939 return ret;
940 memcpy(buf, tmp_buf, count);
941 }
942 return count1;
943 }
944
945 int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
946 const void *buf, int count1)
947 {
948 uint8_t tmp_buf[BDRV_SECTOR_SIZE];
949 int len, nb_sectors, count;
950 int64_t sector_num;
951 int ret;
952
953 count = count1;
954 /* first write to align to sector start */
955 len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
956 if (len > count)
957 len = count;
958 sector_num = offset >> BDRV_SECTOR_BITS;
959 if (len > 0) {
960 if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
961 return ret;
962 memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len);
963 if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0)
964 return ret;
965 count -= len;
966 if (count == 0)
967 return count1;
968 sector_num++;
969 buf += len;
970 }
971
972 /* write the sectors "in place" */
973 nb_sectors = count >> BDRV_SECTOR_BITS;
974 if (nb_sectors > 0) {
975 if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0)
976 return ret;
977 sector_num += nb_sectors;
978 len = nb_sectors << BDRV_SECTOR_BITS;
979 buf += len;
980 count -= len;
981 }
982
983 /* add data from the last sector */
984 if (count > 0) {
985 if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0)
986 return ret;
987 memcpy(tmp_buf, buf, count);
988 if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0)
989 return ret;
990 }
991 return count1;
992 }
993
994 /**
995 * Truncate file to 'offset' bytes (needed only for file protocols)
996 */
997 int bdrv_truncate(BlockDriverState *bs, int64_t offset)
998 {
999 BlockDriver *drv = bs->drv;
1000 int ret;
1001 if (!drv)
1002 return -ENOMEDIUM;
1003 if (!drv->bdrv_truncate)
1004 return -ENOTSUP;
1005 if (bs->read_only)
1006 return -EACCES;
1007 ret = drv->bdrv_truncate(bs, offset);
1008 if (ret == 0) {
1009 ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS);
1010 }
1011 return ret;
1012 }
1013
1014 /**
1015 * Length of a file in bytes. Return < 0 if error or unknown.
1016 */
1017 int64_t bdrv_getlength(BlockDriverState *bs)
1018 {
1019 BlockDriver *drv = bs->drv;
1020 if (!drv)
1021 return -ENOMEDIUM;
1022
1023 /* Fixed size devices use the total_sectors value for speed instead of
1024 issuing a length query (like lseek) on each call. Also, legacy block
1025 drivers don't provide a bdrv_getlength function and must use
1026 total_sectors. */
1027 if (!bs->growable || !drv->bdrv_getlength) {
1028 return bs->total_sectors * BDRV_SECTOR_SIZE;
1029 }
1030 return drv->bdrv_getlength(bs);
1031 }
1032
1033 /* return 0 as number of sectors if no device present or error */
1034 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
1035 {
1036 int64_t length;
1037 length = bdrv_getlength(bs);
1038 if (length < 0)
1039 length = 0;
1040 else
1041 length = length >> BDRV_SECTOR_BITS;
1042 *nb_sectors_ptr = length;
1043 }
1044
1045 struct partition {
1046 uint8_t boot_ind; /* 0x80 - active */
1047 uint8_t head; /* starting head */
1048 uint8_t sector; /* starting sector */
1049 uint8_t cyl; /* starting cylinder */
1050 uint8_t sys_ind; /* What partition type */
1051 uint8_t end_head; /* end head */
1052 uint8_t end_sector; /* end sector */
1053 uint8_t end_cyl; /* end cylinder */
1054 uint32_t start_sect; /* starting sector counting from 0 */
1055 uint32_t nr_sects; /* nr of sectors in partition */
1056 } __attribute__((packed));
1057
1058 /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
1059 static int guess_disk_lchs(BlockDriverState *bs,
1060 int *pcylinders, int *pheads, int *psectors)
1061 {
1062 uint8_t buf[512];
1063 int ret, i, heads, sectors, cylinders;
1064 struct partition *p;
1065 uint32_t nr_sects;
1066 uint64_t nb_sectors;
1067
1068 bdrv_get_geometry(bs, &nb_sectors);
1069
1070 ret = bdrv_read(bs, 0, buf, 1);
1071 if (ret < 0)
1072 return -1;
1073 /* test msdos magic */
1074 if (buf[510] != 0x55 || buf[511] != 0xaa)
1075 return -1;
1076 for(i = 0; i < 4; i++) {
1077 p = ((struct partition *)(buf + 0x1be)) + i;
1078 nr_sects = le32_to_cpu(p->nr_sects);
1079 if (nr_sects && p->end_head) {
1080 /* We make the assumption that the partition terminates on
1081 a cylinder boundary */
1082 heads = p->end_head + 1;
1083 sectors = p->end_sector & 63;
1084 if (sectors == 0)
1085 continue;
1086 cylinders = nb_sectors / (heads * sectors);
1087 if (cylinders < 1 || cylinders > 16383)
1088 continue;
1089 *pheads = heads;
1090 *psectors = sectors;
1091 *pcylinders = cylinders;
1092 #if 0
1093 printf("guessed geometry: LCHS=%d %d %d\n",
1094 cylinders, heads, sectors);
1095 #endif
1096 return 0;
1097 }
1098 }
1099 return -1;
1100 }
1101
1102 void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs)
1103 {
1104 int translation, lba_detected = 0;
1105 int cylinders, heads, secs;
1106 uint64_t nb_sectors;
1107
1108 /* if a geometry hint is available, use it */
1109 bdrv_get_geometry(bs, &nb_sectors);
1110 bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs);
1111 translation = bdrv_get_translation_hint(bs);
1112 if (cylinders != 0) {
1113 *pcyls = cylinders;
1114 *pheads = heads;
1115 *psecs = secs;
1116 } else {
1117 if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) {
1118 if (heads > 16) {
1119 /* if heads > 16, it means that a BIOS LBA
1120 translation was active, so the default
1121 hardware geometry is OK */
1122 lba_detected = 1;
1123 goto default_geometry;
1124 } else {
1125 *pcyls = cylinders;
1126 *pheads = heads;
1127 *psecs = secs;
1128 /* disable any translation to be in sync with
1129 the logical geometry */
1130 if (translation == BIOS_ATA_TRANSLATION_AUTO) {
1131 bdrv_set_translation_hint(bs,
1132 BIOS_ATA_TRANSLATION_NONE);
1133 }
1134 }
1135 } else {
1136 default_geometry:
1137 /* if no geometry, use a standard physical disk geometry */
1138 cylinders = nb_sectors / (16 * 63);
1139
1140 if (cylinders > 16383)
1141 cylinders = 16383;
1142 else if (cylinders < 2)
1143 cylinders = 2;
1144 *pcyls = cylinders;
1145 *pheads = 16;
1146 *psecs = 63;
1147 if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) {
1148 if ((*pcyls * *pheads) <= 131072) {
1149 bdrv_set_translation_hint(bs,
1150 BIOS_ATA_TRANSLATION_LARGE);
1151 } else {
1152 bdrv_set_translation_hint(bs,
1153 BIOS_ATA_TRANSLATION_LBA);
1154 }
1155 }
1156 }
1157 bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs);
1158 }
1159 }
1160
1161 void bdrv_set_geometry_hint(BlockDriverState *bs,
1162 int cyls, int heads, int secs)
1163 {
1164 bs->cyls = cyls;
1165 bs->heads = heads;
1166 bs->secs = secs;
1167 }
1168
1169 void bdrv_set_type_hint(BlockDriverState *bs, int type)
1170 {
1171 bs->type = type;
1172 bs->removable = ((type == BDRV_TYPE_CDROM ||
1173 type == BDRV_TYPE_FLOPPY));
1174 }
1175
1176 void bdrv_set_translation_hint(BlockDriverState *bs, int translation)
1177 {
1178 bs->translation = translation;
1179 }
1180
1181 void bdrv_get_geometry_hint(BlockDriverState *bs,
1182 int *pcyls, int *pheads, int *psecs)
1183 {
1184 *pcyls = bs->cyls;
1185 *pheads = bs->heads;
1186 *psecs = bs->secs;
1187 }
1188
1189 int bdrv_get_type_hint(BlockDriverState *bs)
1190 {
1191 return bs->type;
1192 }
1193
1194 int bdrv_get_translation_hint(BlockDriverState *bs)
1195 {
1196 return bs->translation;
1197 }
1198
1199 int bdrv_is_removable(BlockDriverState *bs)
1200 {
1201 return bs->removable;
1202 }
1203
1204 int bdrv_is_read_only(BlockDriverState *bs)
1205 {
1206 return bs->read_only;
1207 }
1208
1209 int bdrv_is_sg(BlockDriverState *bs)
1210 {
1211 return bs->sg;
1212 }
1213
1214 int bdrv_enable_write_cache(BlockDriverState *bs)
1215 {
1216 return bs->enable_write_cache;
1217 }
1218
1219 /* XXX: no longer used */
1220 void bdrv_set_change_cb(BlockDriverState *bs,
1221 void (*change_cb)(void *opaque), void *opaque)
1222 {
1223 bs->change_cb = change_cb;
1224 bs->change_opaque = opaque;
1225 }
1226
1227 int bdrv_is_encrypted(BlockDriverState *bs)
1228 {
1229 if (bs->backing_hd && bs->backing_hd->encrypted)
1230 return 1;
1231 return bs->encrypted;
1232 }
1233
1234 int bdrv_key_required(BlockDriverState *bs)
1235 {
1236 BlockDriverState *backing_hd = bs->backing_hd;
1237
1238 if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key)
1239 return 1;
1240 return (bs->encrypted && !bs->valid_key);
1241 }
1242
1243 int bdrv_set_key(BlockDriverState *bs, const char *key)
1244 {
1245 int ret;
1246 if (bs->backing_hd && bs->backing_hd->encrypted) {
1247 ret = bdrv_set_key(bs->backing_hd, key);
1248 if (ret < 0)
1249 return ret;
1250 if (!bs->encrypted)
1251 return 0;
1252 }
1253 if (!bs->encrypted) {
1254 return -EINVAL;
1255 } else if (!bs->drv || !bs->drv->bdrv_set_key) {
1256 return -ENOMEDIUM;
1257 }
1258 ret = bs->drv->bdrv_set_key(bs, key);
1259 if (ret < 0) {
1260 bs->valid_key = 0;
1261 } else if (!bs->valid_key) {
1262 bs->valid_key = 1;
1263 /* call the change callback now, we skipped it on open */
1264 bs->media_changed = 1;
1265 if (bs->change_cb)
1266 bs->change_cb(bs->change_opaque);
1267 }
1268 return ret;
1269 }
1270
1271 void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size)
1272 {
1273 if (!bs->drv) {
1274 buf[0] = '\0';
1275 } else {
1276 pstrcpy(buf, buf_size, bs->drv->format_name);
1277 }
1278 }
1279
1280 void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
1281 void *opaque)
1282 {
1283 BlockDriver *drv;
1284
1285 QLIST_FOREACH(drv, &bdrv_drivers, list) {
1286 it(opaque, drv->format_name);
1287 }
1288 }
1289
1290 BlockDriverState *bdrv_find(const char *name)
1291 {
1292 BlockDriverState *bs;
1293
1294 QTAILQ_FOREACH(bs, &bdrv_states, list) {
1295 if (!strcmp(name, bs->device_name)) {
1296 return bs;
1297 }
1298 }
1299 return NULL;
1300 }
1301
1302 void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque)
1303 {
1304 BlockDriverState *bs;
1305
1306 QTAILQ_FOREACH(bs, &bdrv_states, list) {
1307 it(opaque, bs);
1308 }
1309 }
1310
1311 const char *bdrv_get_device_name(BlockDriverState *bs)
1312 {
1313 return bs->device_name;
1314 }
1315
1316 void bdrv_flush(BlockDriverState *bs)
1317 {
1318 if (bs->open_flags & BDRV_O_NO_FLUSH) {
1319 return;
1320 }
1321
1322 if (bs->drv && bs->drv->bdrv_flush)
1323 bs->drv->bdrv_flush(bs);
1324 }
1325
1326 void bdrv_flush_all(void)
1327 {
1328 BlockDriverState *bs;
1329
1330 QTAILQ_FOREACH(bs, &bdrv_states, list) {
1331 if (bs->drv && !bdrv_is_read_only(bs) &&
1332 (!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) {
1333 bdrv_flush(bs);
1334 }
1335 }
1336 }
1337
1338 int bdrv_has_zero_init(BlockDriverState *bs)
1339 {
1340 assert(bs->drv);
1341
1342 if (bs->drv->no_zero_init) {
1343 return 0;
1344 } else if (bs->file) {
1345 return bdrv_has_zero_init(bs->file);
1346 }
1347
1348 return 1;
1349 }
1350
1351 /*
1352 * Returns true iff the specified sector is present in the disk image. Drivers
1353 * not implementing the functionality are assumed to not support backing files,
1354 * hence all their sectors are reported as allocated.
1355 *
1356 * 'pnum' is set to the number of sectors (including and immediately following
1357 * the specified sector) that are known to be in the same
1358 * allocated/unallocated state.
1359 *
1360 * 'nb_sectors' is the max value 'pnum' should be set to.
1361 */
1362 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
1363 int *pnum)
1364 {
1365 int64_t n;
1366 if (!bs->drv->bdrv_is_allocated) {
1367 if (sector_num >= bs->total_sectors) {
1368 *pnum = 0;
1369 return 0;
1370 }
1371 n = bs->total_sectors - sector_num;
1372 *pnum = (n < nb_sectors) ? (n) : (nb_sectors);
1373 return 1;
1374 }
1375 return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
1376 }
1377
1378 void bdrv_mon_event(const BlockDriverState *bdrv,
1379 BlockMonEventAction action, int is_read)
1380 {
1381 QObject *data;
1382 const char *action_str;
1383
1384 switch (action) {
1385 case BDRV_ACTION_REPORT:
1386 action_str = "report";
1387 break;
1388 case BDRV_ACTION_IGNORE:
1389 action_str = "ignore";
1390 break;
1391 case BDRV_ACTION_STOP:
1392 action_str = "stop";
1393 break;
1394 default:
1395 abort();
1396 }
1397
1398 data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }",
1399 bdrv->device_name,
1400 action_str,
1401 is_read ? "read" : "write");
1402 monitor_protocol_event(QEVENT_BLOCK_IO_ERROR, data);
1403
1404 qobject_decref(data);
1405 }
1406
1407 static void bdrv_print_dict(QObject *obj, void *opaque)
1408 {
1409 QDict *bs_dict;
1410 Monitor *mon = opaque;
1411
1412 bs_dict = qobject_to_qdict(obj);
1413
1414 monitor_printf(mon, "%s: type=%s removable=%d",
1415 qdict_get_str(bs_dict, "device"),
1416 qdict_get_str(bs_dict, "type"),
1417 qdict_get_bool(bs_dict, "removable"));
1418
1419 if (qdict_get_bool(bs_dict, "removable")) {
1420 monitor_printf(mon, " locked=%d", qdict_get_bool(bs_dict, "locked"));
1421 }
1422
1423 if (qdict_haskey(bs_dict, "inserted")) {
1424 QDict *qdict = qobject_to_qdict(qdict_get(bs_dict, "inserted"));
1425
1426 monitor_printf(mon, " file=");
1427 monitor_print_filename(mon, qdict_get_str(qdict, "file"));
1428 if (qdict_haskey(qdict, "backing_file")) {
1429 monitor_printf(mon, " backing_file=");
1430 monitor_print_filename(mon, qdict_get_str(qdict, "backing_file"));
1431 }
1432 monitor_printf(mon, " ro=%d drv=%s encrypted=%d",
1433 qdict_get_bool(qdict, "ro"),
1434 qdict_get_str(qdict, "drv"),
1435 qdict_get_bool(qdict, "encrypted"));
1436 } else {
1437 monitor_printf(mon, " [not inserted]");
1438 }
1439
1440 monitor_printf(mon, "\n");
1441 }
1442
1443 void bdrv_info_print(Monitor *mon, const QObject *data)
1444 {
1445 qlist_iter(qobject_to_qlist(data), bdrv_print_dict, mon);
1446 }
1447
1448 void bdrv_info(Monitor *mon, QObject **ret_data)
1449 {
1450 QList *bs_list;
1451 BlockDriverState *bs;
1452
1453 bs_list = qlist_new();
1454
1455 QTAILQ_FOREACH(bs, &bdrv_states, list) {
1456 QObject *bs_obj;
1457 const char *type = "unknown";
1458
1459 switch(bs->type) {
1460 case BDRV_TYPE_HD:
1461 type = "hd";
1462 break;
1463 case BDRV_TYPE_CDROM:
1464 type = "cdrom";
1465 break;
1466 case BDRV_TYPE_FLOPPY:
1467 type = "floppy";
1468 break;
1469 }
1470
1471 bs_obj = qobject_from_jsonf("{ 'device': %s, 'type': %s, "
1472 "'removable': %i, 'locked': %i }",
1473 bs->device_name, type, bs->removable,
1474 bs->locked);
1475
1476 if (bs->drv) {
1477 QObject *obj;
1478 QDict *bs_dict = qobject_to_qdict(bs_obj);
1479
1480 obj = qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, "
1481 "'encrypted': %i }",
1482 bs->filename, bs->read_only,
1483 bs->drv->format_name,
1484 bdrv_is_encrypted(bs));
1485 if (bs->backing_file[0] != '\0') {
1486 QDict *qdict = qobject_to_qdict(obj);
1487 qdict_put(qdict, "backing_file",
1488 qstring_from_str(bs->backing_file));
1489 }
1490
1491 qdict_put_obj(bs_dict, "inserted", obj);
1492 }
1493 qlist_append_obj(bs_list, bs_obj);
1494 }
1495
1496 *ret_data = QOBJECT(bs_list);
1497 }
1498
1499 static void bdrv_stats_iter(QObject *data, void *opaque)
1500 {
1501 QDict *qdict;
1502 Monitor *mon = opaque;
1503
1504 qdict = qobject_to_qdict(data);
1505 monitor_printf(mon, "%s:", qdict_get_str(qdict, "device"));
1506
1507 qdict = qobject_to_qdict(qdict_get(qdict, "stats"));
1508 monitor_printf(mon, " rd_bytes=%" PRId64
1509 " wr_bytes=%" PRId64
1510 " rd_operations=%" PRId64
1511 " wr_operations=%" PRId64
1512 "\n",
1513 qdict_get_int(qdict, "rd_bytes"),
1514 qdict_get_int(qdict, "wr_bytes"),
1515 qdict_get_int(qdict, "rd_operations"),
1516 qdict_get_int(qdict, "wr_operations"));
1517 }
1518
1519 void bdrv_stats_print(Monitor *mon, const QObject *data)
1520 {
1521 qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon);
1522 }
1523
1524 static QObject* bdrv_info_stats_bs(BlockDriverState *bs)
1525 {
1526 QObject *res;
1527 QDict *dict;
1528
1529 res = qobject_from_jsonf("{ 'stats': {"
1530 "'rd_bytes': %" PRId64 ","
1531 "'wr_bytes': %" PRId64 ","
1532 "'rd_operations': %" PRId64 ","
1533 "'wr_operations': %" PRId64 ","
1534 "'wr_highest_offset': %" PRId64
1535 "} }",
1536 bs->rd_bytes, bs->wr_bytes,
1537 bs->rd_ops, bs->wr_ops,
1538 bs->wr_highest_sector * 512);
1539 dict = qobject_to_qdict(res);
1540
1541 if (*bs->device_name) {
1542 qdict_put(dict, "device", qstring_from_str(bs->device_name));
1543 }
1544
1545 if (bs->file) {
1546 QObject *parent = bdrv_info_stats_bs(bs->file);
1547 qdict_put_obj(dict, "parent", parent);
1548 }
1549
1550 return res;
1551 }
1552
1553 void bdrv_info_stats(Monitor *mon, QObject **ret_data)
1554 {
1555 QObject *obj;
1556 QList *devices;
1557 BlockDriverState *bs;
1558
1559 devices = qlist_new();
1560
1561 QTAILQ_FOREACH(bs, &bdrv_states, list) {
1562 obj = bdrv_info_stats_bs(bs);
1563 qlist_append_obj(devices, obj);
1564 }
1565
1566 *ret_data = QOBJECT(devices);
1567 }
1568
1569 const char *bdrv_get_encrypted_filename(BlockDriverState *bs)
1570 {
1571 if (bs->backing_hd && bs->backing_hd->encrypted)
1572 return bs->backing_file;
1573 else if (bs->encrypted)
1574 return bs->filename;
1575 else
1576 return NULL;
1577 }
1578
1579 void bdrv_get_backing_filename(BlockDriverState *bs,
1580 char *filename, int filename_size)
1581 {
1582 if (!bs->backing_file) {
1583 pstrcpy(filename, filename_size, "");
1584 } else {
1585 pstrcpy(filename, filename_size, bs->backing_file);
1586 }
1587 }
1588
1589 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
1590 const uint8_t *buf, int nb_sectors)
1591 {
1592 BlockDriver *drv = bs->drv;
1593 if (!drv)
1594 return -ENOMEDIUM;
1595 if (!drv->bdrv_write_compressed)
1596 return -ENOTSUP;
1597 if (bdrv_check_request(bs, sector_num, nb_sectors))
1598 return -EIO;
1599
1600 if (bs->dirty_bitmap) {
1601 set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
1602 }
1603
1604 return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
1605 }
1606
1607 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
1608 {
1609 BlockDriver *drv = bs->drv;
1610 if (!drv)
1611 return -ENOMEDIUM;
1612 if (!drv->bdrv_get_info)
1613 return -ENOTSUP;
1614 memset(bdi, 0, sizeof(*bdi));
1615 return drv->bdrv_get_info(bs, bdi);
1616 }
1617
1618 int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf,
1619 int64_t pos, int size)
1620 {
1621 BlockDriver *drv = bs->drv;
1622 if (!drv)
1623 return -ENOMEDIUM;
1624 if (!drv->bdrv_save_vmstate)
1625 return -ENOTSUP;
1626 return drv->bdrv_save_vmstate(bs, buf, pos, size);
1627 }
1628
1629 int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
1630 int64_t pos, int size)
1631 {
1632 BlockDriver *drv = bs->drv;
1633 if (!drv)
1634 return -ENOMEDIUM;
1635 if (!drv->bdrv_load_vmstate)
1636 return -ENOTSUP;
1637 return drv->bdrv_load_vmstate(bs, buf, pos, size);
1638 }
1639
1640 void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event)
1641 {
1642 BlockDriver *drv = bs->drv;
1643
1644 if (!drv || !drv->bdrv_debug_event) {
1645 return;
1646 }
1647
1648 return drv->bdrv_debug_event(bs, event);
1649
1650 }
1651
1652 /**************************************************************/
1653 /* handling of snapshots */
1654
1655 int bdrv_snapshot_create(BlockDriverState *bs,
1656 QEMUSnapshotInfo *sn_info)
1657 {
1658 BlockDriver *drv = bs->drv;
1659 if (!drv)
1660 return -ENOMEDIUM;
1661 if (!drv->bdrv_snapshot_create)
1662 return -ENOTSUP;
1663 return drv->bdrv_snapshot_create(bs, sn_info);
1664 }
1665
1666 int bdrv_snapshot_goto(BlockDriverState *bs,
1667 const char *snapshot_id)
1668 {
1669 BlockDriver *drv = bs->drv;
1670 if (!drv)
1671 return -ENOMEDIUM;
1672 if (!drv->bdrv_snapshot_goto)
1673 return -ENOTSUP;
1674 return drv->bdrv_snapshot_goto(bs, snapshot_id);
1675 }
1676
1677 int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
1678 {
1679 BlockDriver *drv = bs->drv;
1680 if (!drv)
1681 return -ENOMEDIUM;
1682 if (!drv->bdrv_snapshot_delete)
1683 return -ENOTSUP;
1684 return drv->bdrv_snapshot_delete(bs, snapshot_id);
1685 }
1686
1687 int bdrv_snapshot_list(BlockDriverState *bs,
1688 QEMUSnapshotInfo **psn_info)
1689 {
1690 BlockDriver *drv = bs->drv;
1691 if (!drv)
1692 return -ENOMEDIUM;
1693 if (!drv->bdrv_snapshot_list)
1694 return -ENOTSUP;
1695 return drv->bdrv_snapshot_list(bs, psn_info);
1696 }
1697
1698 #define NB_SUFFIXES 4
1699
1700 char *get_human_readable_size(char *buf, int buf_size, int64_t size)
1701 {
1702 static const char suffixes[NB_SUFFIXES] = "KMGT";
1703 int64_t base;
1704 int i;
1705
1706 if (size <= 999) {
1707 snprintf(buf, buf_size, "%" PRId64, size);
1708 } else {
1709 base = 1024;
1710 for(i = 0; i < NB_SUFFIXES; i++) {
1711 if (size < (10 * base)) {
1712 snprintf(buf, buf_size, "%0.1f%c",
1713 (double)size / base,
1714 suffixes[i]);
1715 break;
1716 } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) {
1717 snprintf(buf, buf_size, "%" PRId64 "%c",
1718 ((size + (base >> 1)) / base),
1719 suffixes[i]);
1720 break;
1721 }
1722 base = base * 1024;
1723 }
1724 }
1725 return buf;
1726 }
1727
1728 char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn)
1729 {
1730 char buf1[128], date_buf[128], clock_buf[128];
1731 #ifdef _WIN32
1732 struct tm *ptm;
1733 #else
1734 struct tm tm;
1735 #endif
1736 time_t ti;
1737 int64_t secs;
1738
1739 if (!sn) {
1740 snprintf(buf, buf_size,
1741 "%-10s%-20s%7s%20s%15s",
1742 "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
1743 } else {
1744 ti = sn->date_sec;
1745 #ifdef _WIN32
1746 ptm = localtime(&ti);
1747 strftime(date_buf, sizeof(date_buf),
1748 "%Y-%m-%d %H:%M:%S", ptm);
1749 #else
1750 localtime_r(&ti, &tm);
1751 strftime(date_buf, sizeof(date_buf),
1752 "%Y-%m-%d %H:%M:%S", &tm);
1753 #endif
1754 secs = sn->vm_clock_nsec / 1000000000;
1755 snprintf(clock_buf, sizeof(clock_buf),
1756 "%02d:%02d:%02d.%03d",
1757 (int)(secs / 3600),
1758 (int)((secs / 60) % 60),
1759 (int)(secs % 60),
1760 (int)((sn->vm_clock_nsec / 1000000) % 1000));
1761 snprintf(buf, buf_size,
1762 "%-10s%-20s%7s%20s%15s",
1763 sn->id_str, sn->name,
1764 get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
1765 date_buf,
1766 clock_buf);
1767 }
1768 return buf;
1769 }
1770
1771
1772 /**************************************************************/
1773 /* async I/Os */
1774
1775 BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
1776 QEMUIOVector *qiov, int nb_sectors,
1777 BlockDriverCompletionFunc *cb, void *opaque)
1778 {
1779 BlockDriver *drv = bs->drv;
1780 BlockDriverAIOCB *ret;
1781
1782 if (!drv)
1783 return NULL;
1784 if (bdrv_check_request(bs, sector_num, nb_sectors))
1785 return NULL;
1786
1787 ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors,
1788 cb, opaque);
1789
1790 if (ret) {
1791 /* Update stats even though technically transfer has not happened. */
1792 bs->rd_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
1793 bs->rd_ops ++;
1794 }
1795
1796 return ret;
1797 }
1798
1799 BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
1800 QEMUIOVector *qiov, int nb_sectors,
1801 BlockDriverCompletionFunc *cb, void *opaque)
1802 {
1803 BlockDriver *drv = bs->drv;
1804 BlockDriverAIOCB *ret;
1805
1806 if (!drv)
1807 return NULL;
1808 if (bs->read_only)
1809 return NULL;
1810 if (bdrv_check_request(bs, sector_num, nb_sectors))
1811 return NULL;
1812
1813 if (bs->dirty_bitmap) {
1814 set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
1815 }
1816
1817 ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors,
1818 cb, opaque);
1819
1820 if (ret) {
1821 /* Update stats even though technically transfer has not happened. */
1822 bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
1823 bs->wr_ops ++;
1824 if (bs->wr_highest_sector < sector_num + nb_sectors - 1) {
1825 bs->wr_highest_sector = sector_num + nb_sectors - 1;
1826 }
1827 }
1828
1829 return ret;
1830 }
1831
1832
1833 typedef struct MultiwriteCB {
1834 int error;
1835 int num_requests;
1836 int num_callbacks;
1837 struct {
1838 BlockDriverCompletionFunc *cb;
1839 void *opaque;
1840 QEMUIOVector *free_qiov;
1841 void *free_buf;
1842 } callbacks[];
1843 } MultiwriteCB;
1844
1845 static void multiwrite_user_cb(MultiwriteCB *mcb)
1846 {
1847 int i;
1848
1849 for (i = 0; i < mcb->num_callbacks; i++) {
1850 mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error);
1851 if (mcb->callbacks[i].free_qiov) {
1852 qemu_iovec_destroy(mcb->callbacks[i].free_qiov);
1853 }
1854 qemu_free(mcb->callbacks[i].free_qiov);
1855 qemu_vfree(mcb->callbacks[i].free_buf);
1856 }
1857 }
1858
1859 static void multiwrite_cb(void *opaque, int ret)
1860 {
1861 MultiwriteCB *mcb = opaque;
1862
1863 if (ret < 0 && !mcb->error) {
1864 mcb->error = ret;
1865 multiwrite_user_cb(mcb);
1866 }
1867
1868 mcb->num_requests--;
1869 if (mcb->num_requests == 0) {
1870 if (mcb->error == 0) {
1871 multiwrite_user_cb(mcb);
1872 }
1873 qemu_free(mcb);
1874 }
1875 }
1876
1877 static int multiwrite_req_compare(const void *a, const void *b)
1878 {
1879 const BlockRequest *req1 = a, *req2 = b;
1880
1881 /*
1882 * Note that we can't simply subtract req2->sector from req1->sector
1883 * here as that could overflow the return value.
1884 */
1885 if (req1->sector > req2->sector) {
1886 return 1;
1887 } else if (req1->sector < req2->sector) {
1888 return -1;
1889 } else {
1890 return 0;
1891 }
1892 }
1893
1894 /*
1895 * Takes a bunch of requests and tries to merge them. Returns the number of
1896 * requests that remain after merging.
1897 */
1898 static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs,
1899 int num_reqs, MultiwriteCB *mcb)
1900 {
1901 int i, outidx;
1902
1903 // Sort requests by start sector
1904 qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare);
1905
1906 // Check if adjacent requests touch the same clusters. If so, combine them,
1907 // filling up gaps with zero sectors.
1908 outidx = 0;
1909 for (i = 1; i < num_reqs; i++) {
1910 int merge = 0;
1911 int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors;
1912
1913 // This handles the cases that are valid for all block drivers, namely
1914 // exactly sequential writes and overlapping writes.
1915 if (reqs[i].sector <= oldreq_last) {
1916 merge = 1;
1917 }
1918
1919 // The block driver may decide that it makes sense to combine requests
1920 // even if there is a gap of some sectors between them. In this case,
1921 // the gap is filled with zeros (therefore only applicable for yet
1922 // unused space in format like qcow2).
1923 if (!merge && bs->drv->bdrv_merge_requests) {
1924 merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]);
1925 }
1926
1927 if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) {
1928 merge = 0;
1929 }
1930
1931 if (merge) {
1932 size_t size;
1933 QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov));
1934 qemu_iovec_init(qiov,
1935 reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1);
1936
1937 // Add the first request to the merged one. If the requests are
1938 // overlapping, drop the last sectors of the first request.
1939 size = (reqs[i].sector - reqs[outidx].sector) << 9;
1940 qemu_iovec_concat(qiov, reqs[outidx].qiov, size);
1941
1942 // We might need to add some zeros between the two requests
1943 if (reqs[i].sector > oldreq_last) {
1944 size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9;
1945 uint8_t *buf = qemu_blockalign(bs, zero_bytes);
1946 memset(buf, 0, zero_bytes);
1947 qemu_iovec_add(qiov, buf, zero_bytes);
1948 mcb->callbacks[i].free_buf = buf;
1949 }
1950
1951 // Add the second request
1952 qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size);
1953
1954 reqs[outidx].nb_sectors = qiov->size >> 9;
1955 reqs[outidx].qiov = qiov;
1956
1957 mcb->callbacks[i].free_qiov = reqs[outidx].qiov;
1958 } else {
1959 outidx++;
1960 reqs[outidx].sector = reqs[i].sector;
1961 reqs[outidx].nb_sectors = reqs[i].nb_sectors;
1962 reqs[outidx].qiov = reqs[i].qiov;
1963 }
1964 }
1965
1966 return outidx + 1;
1967 }
1968
1969 /*
1970 * Submit multiple AIO write requests at once.
1971 *
1972 * On success, the function returns 0 and all requests in the reqs array have
1973 * been submitted. In error case this function returns -1, and any of the
1974 * requests may or may not be submitted yet. In particular, this means that the
1975 * callback will be called for some of the requests, for others it won't. The
1976 * caller must check the error field of the BlockRequest to wait for the right
1977 * callbacks (if error != 0, no callback will be called).
1978 *
1979 * The implementation may modify the contents of the reqs array, e.g. to merge
1980 * requests. However, the fields opaque and error are left unmodified as they
1981 * are used to signal failure for a single request to the caller.
1982 */
1983 int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs)
1984 {
1985 BlockDriverAIOCB *acb;
1986 MultiwriteCB *mcb;
1987 int i;
1988
1989 if (num_reqs == 0) {
1990 return 0;
1991 }
1992
1993 // Create MultiwriteCB structure
1994 mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks));
1995 mcb->num_requests = 0;
1996 mcb->num_callbacks = num_reqs;
1997
1998 for (i = 0; i < num_reqs; i++) {
1999 mcb->callbacks[i].cb = reqs[i].cb;
2000 mcb->callbacks[i].opaque = reqs[i].opaque;
2001 }
2002
2003 // Check for mergable requests
2004 num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb);
2005
2006 // Run the aio requests
2007 for (i = 0; i < num_reqs; i++) {
2008 acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov,
2009 reqs[i].nb_sectors, multiwrite_cb, mcb);
2010
2011 if (acb == NULL) {
2012 // We can only fail the whole thing if no request has been
2013 // submitted yet. Otherwise we'll wait for the submitted AIOs to
2014 // complete and report the error in the callback.
2015 if (mcb->num_requests == 0) {
2016 reqs[i].error = -EIO;
2017 goto fail;
2018 } else {
2019 mcb->num_requests++;
2020 multiwrite_cb(mcb, -EIO);
2021 break;
2022 }
2023 } else {
2024 mcb->num_requests++;
2025 }
2026 }
2027
2028 return 0;
2029
2030 fail:
2031 qemu_free(mcb);
2032 return -1;
2033 }
2034
2035 BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs,
2036 BlockDriverCompletionFunc *cb, void *opaque)
2037 {
2038 BlockDriver *drv = bs->drv;
2039
2040 if (bs->open_flags & BDRV_O_NO_FLUSH) {
2041 return bdrv_aio_noop_em(bs, cb, opaque);
2042 }
2043
2044 if (!drv)
2045 return NULL;
2046 return drv->bdrv_aio_flush(bs, cb, opaque);
2047 }
2048
2049 void bdrv_aio_cancel(BlockDriverAIOCB *acb)
2050 {
2051 acb->pool->cancel(acb);
2052 }
2053
2054
2055 /**************************************************************/
2056 /* async block device emulation */
2057
2058 typedef struct BlockDriverAIOCBSync {
2059 BlockDriverAIOCB common;
2060 QEMUBH *bh;
2061 int ret;
2062 /* vector translation state */
2063 QEMUIOVector *qiov;
2064 uint8_t *bounce;
2065 int is_write;
2066 } BlockDriverAIOCBSync;
2067
2068 static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb)
2069 {
2070 BlockDriverAIOCBSync *acb =
2071 container_of(blockacb, BlockDriverAIOCBSync, common);
2072 qemu_bh_delete(acb->bh);
2073 acb->bh = NULL;
2074 qemu_aio_release(acb);
2075 }
2076
2077 static AIOPool bdrv_em_aio_pool = {
2078 .aiocb_size = sizeof(BlockDriverAIOCBSync),
2079 .cancel = bdrv_aio_cancel_em,
2080 };
2081
2082 static void bdrv_aio_bh_cb(void *opaque)
2083 {
2084 BlockDriverAIOCBSync *acb = opaque;
2085
2086 if (!acb->is_write)
2087 qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size);
2088 qemu_vfree(acb->bounce);
2089 acb->common.cb(acb->common.opaque, acb->ret);
2090 qemu_bh_delete(acb->bh);
2091 acb->bh = NULL;
2092 qemu_aio_release(acb);
2093 }
2094
2095 static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
2096 int64_t sector_num,
2097 QEMUIOVector *qiov,
2098 int nb_sectors,
2099 BlockDriverCompletionFunc *cb,
2100 void *opaque,
2101 int is_write)
2102
2103 {
2104 BlockDriverAIOCBSync *acb;
2105
2106 acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
2107 acb->is_write = is_write;
2108 acb->qiov = qiov;
2109 acb->bounce = qemu_blockalign(bs, qiov->size);
2110
2111 if (!acb->bh)
2112 acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
2113
2114 if (is_write) {
2115 qemu_iovec_to_buffer(acb->qiov, acb->bounce);
2116 acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors);
2117 } else {
2118 acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors);
2119 }
2120
2121 qemu_bh_schedule(acb->bh);
2122
2123 return &acb->common;
2124 }
2125
2126 static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
2127 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
2128 BlockDriverCompletionFunc *cb, void *opaque)
2129 {
2130 return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0);
2131 }
2132
2133 static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
2134 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
2135 BlockDriverCompletionFunc *cb, void *opaque)
2136 {
2137 return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1);
2138 }
2139
2140 static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
2141 BlockDriverCompletionFunc *cb, void *opaque)
2142 {
2143 BlockDriverAIOCBSync *acb;
2144
2145 acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
2146 acb->is_write = 1; /* don't bounce in the completion hadler */
2147 acb->qiov = NULL;
2148 acb->bounce = NULL;
2149 acb->ret = 0;
2150
2151 if (!acb->bh)
2152 acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
2153
2154 bdrv_flush(bs);
2155 qemu_bh_schedule(acb->bh);
2156 return &acb->common;
2157 }
2158
2159 static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs,
2160 BlockDriverCompletionFunc *cb, void *opaque)
2161 {
2162 BlockDriverAIOCBSync *acb;
2163
2164 acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque);
2165 acb->is_write = 1; /* don't bounce in the completion handler */
2166 acb->qiov = NULL;
2167 acb->bounce = NULL;
2168 acb->ret = 0;
2169
2170 if (!acb->bh) {
2171 acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
2172 }
2173
2174 qemu_bh_schedule(acb->bh);
2175 return &acb->common;
2176 }
2177
2178 /**************************************************************/
2179 /* sync block device emulation */
2180
2181 static void bdrv_rw_em_cb(void *opaque, int ret)
2182 {
2183 *(int *)opaque = ret;
2184 }
2185
2186 #define NOT_DONE 0x7fffffff
2187
2188 static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
2189 uint8_t *buf, int nb_sectors)
2190 {
2191 int async_ret;
2192 BlockDriverAIOCB *acb;
2193 struct iovec iov;
2194 QEMUIOVector qiov;
2195
2196 async_context_push();
2197
2198 async_ret = NOT_DONE;
2199 iov.iov_base = (void *)buf;
2200 iov.iov_len = nb_sectors * 512;
2201 qemu_iovec_init_external(&qiov, &iov, 1);
2202 acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors,
2203 bdrv_rw_em_cb, &async_ret);
2204 if (acb == NULL) {
2205 async_ret = -1;
2206 goto fail;
2207 }
2208
2209 while (async_ret == NOT_DONE) {
2210 qemu_aio_wait();
2211 }
2212
2213
2214 fail:
2215 async_context_pop();
2216 return async_ret;
2217 }
2218
2219 static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
2220 const uint8_t *buf, int nb_sectors)
2221 {
2222 int async_ret;
2223 BlockDriverAIOCB *acb;
2224 struct iovec iov;
2225 QEMUIOVector qiov;
2226
2227 async_context_push();
2228
2229 async_ret = NOT_DONE;
2230 iov.iov_base = (void *)buf;
2231 iov.iov_len = nb_sectors * 512;
2232 qemu_iovec_init_external(&qiov, &iov, 1);
2233 acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors,
2234 bdrv_rw_em_cb, &async_ret);
2235 if (acb == NULL) {
2236 async_ret = -1;
2237 goto fail;
2238 }
2239 while (async_ret == NOT_DONE) {
2240 qemu_aio_wait();
2241 }
2242
2243 fail:
2244 async_context_pop();
2245 return async_ret;
2246 }
2247
2248 void bdrv_init(void)
2249 {
2250 module_call_init(MODULE_INIT_BLOCK);
2251 }
2252
2253 void bdrv_init_with_whitelist(void)
2254 {
2255 use_bdrv_whitelist = 1;
2256 bdrv_init();
2257 }
2258
2259 void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
2260 BlockDriverCompletionFunc *cb, void *opaque)
2261 {
2262 BlockDriverAIOCB *acb;
2263
2264 if (pool->free_aiocb) {
2265 acb = pool->free_aiocb;
2266 pool->free_aiocb = acb->next;
2267 } else {
2268 acb = qemu_mallocz(pool->aiocb_size);
2269 acb->pool = pool;
2270 }
2271 acb->bs = bs;
2272 acb->cb = cb;
2273 acb->opaque = opaque;
2274 return acb;
2275 }
2276
2277 void qemu_aio_release(void *p)
2278 {
2279 BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p;
2280 AIOPool *pool = acb->pool;
2281 acb->next = pool->free_aiocb;
2282 pool->free_aiocb = acb;
2283 }
2284
2285 /**************************************************************/
2286 /* removable device support */
2287
2288 /**
2289 * Return TRUE if the media is present
2290 */
2291 int bdrv_is_inserted(BlockDriverState *bs)
2292 {
2293 BlockDriver *drv = bs->drv;
2294 int ret;
2295 if (!drv)
2296 return 0;
2297 if (!drv->bdrv_is_inserted)
2298 return 1;
2299 ret = drv->bdrv_is_inserted(bs);
2300 return ret;
2301 }
2302
2303 /**
2304 * Return TRUE if the media changed since the last call to this
2305 * function. It is currently only used for floppy disks
2306 */
2307 int bdrv_media_changed(BlockDriverState *bs)
2308 {
2309 BlockDriver *drv = bs->drv;
2310 int ret;
2311
2312 if (!drv || !drv->bdrv_media_changed)
2313 ret = -ENOTSUP;
2314 else
2315 ret = drv->bdrv_media_changed(bs);
2316 if (ret == -ENOTSUP)
2317 ret = bs->media_changed;
2318 bs->media_changed = 0;
2319 return ret;
2320 }
2321
2322 /**
2323 * If eject_flag is TRUE, eject the media. Otherwise, close the tray
2324 */
2325 int bdrv_eject(BlockDriverState *bs, int eject_flag)
2326 {
2327 BlockDriver *drv = bs->drv;
2328 int ret;
2329
2330 if (bs->locked) {
2331 return -EBUSY;
2332 }
2333
2334 if (!drv || !drv->bdrv_eject) {
2335 ret = -ENOTSUP;
2336 } else {
2337 ret = drv->bdrv_eject(bs, eject_flag);
2338 }
2339 if (ret == -ENOTSUP) {
2340 if (eject_flag)
2341 bdrv_close(bs);
2342 ret = 0;
2343 }
2344
2345 return ret;
2346 }
2347
2348 int bdrv_is_locked(BlockDriverState *bs)
2349 {
2350 return bs->locked;
2351 }
2352
2353 /**
2354 * Lock or unlock the media (if it is locked, the user won't be able
2355 * to eject it manually).
2356 */
2357 void bdrv_set_locked(BlockDriverState *bs, int locked)
2358 {
2359 BlockDriver *drv = bs->drv;
2360
2361 bs->locked = locked;
2362 if (drv && drv->bdrv_set_locked) {
2363 drv->bdrv_set_locked(bs, locked);
2364 }
2365 }
2366
2367 /* needed for generic scsi interface */
2368
2369 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
2370 {
2371 BlockDriver *drv = bs->drv;
2372
2373 if (drv && drv->bdrv_ioctl)
2374 return drv->bdrv_ioctl(bs, req, buf);
2375 return -ENOTSUP;
2376 }
2377
2378 BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
2379 unsigned long int req, void *buf,
2380 BlockDriverCompletionFunc *cb, void *opaque)
2381 {
2382 BlockDriver *drv = bs->drv;
2383
2384 if (drv && drv->bdrv_aio_ioctl)
2385 return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque);
2386 return NULL;
2387 }
2388
2389
2390
2391 void *qemu_blockalign(BlockDriverState *bs, size_t size)
2392 {
2393 return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size);
2394 }
2395
2396 void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable)
2397 {
2398 int64_t bitmap_size;
2399
2400 bs->dirty_count = 0;
2401 if (enable) {
2402 if (!bs->dirty_bitmap) {
2403 bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) +
2404 BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1;
2405 bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8;
2406
2407 bs->dirty_bitmap = qemu_mallocz(bitmap_size);
2408 }
2409 } else {
2410 if (bs->dirty_bitmap) {
2411 qemu_free(bs->dirty_bitmap);
2412 bs->dirty_bitmap = NULL;
2413 }
2414 }
2415 }
2416
2417 int bdrv_get_dirty(BlockDriverState *bs, int64_t sector)
2418 {
2419 int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK;
2420
2421 if (bs->dirty_bitmap &&
2422 (sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) {
2423 return bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] &
2424 (1 << (chunk % (sizeof(unsigned long) * 8)));
2425 } else {
2426 return 0;
2427 }
2428 }
2429
2430 void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
2431 int nr_sectors)
2432 {
2433 set_dirty_bitmap(bs, cur_sector, nr_sectors, 0);
2434 }
2435
2436 int64_t bdrv_get_dirty_count(BlockDriverState *bs)
2437 {
2438 return bs->dirty_count;
2439 }
various patches