MAX7310 I2C qdev conversion
[qemu/aliguori-queue.git] / block.c
blob980fbecf3d90af455c5538c4b9b75310552d322c
1 /*
2 * QEMU System Emulator block driver
4 * Copyright (c) 2003 Fabrice Bellard
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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.
24 #include "config-host.h"
25 #ifdef HOST_BSD
26 /* include native header before sys-queue.h */
27 #include <sys/queue.h>
28 #endif
30 #include "qemu-common.h"
31 #include "monitor.h"
32 #include "block_int.h"
33 #include "module.h"
35 #ifdef HOST_BSD
36 #include <sys/types.h>
37 #include <sys/stat.h>
38 #include <sys/ioctl.h>
39 #ifndef __DragonFly__
40 #include <sys/disk.h>
41 #endif
42 #endif
44 #ifdef _WIN32
45 #include <windows.h>
46 #endif
48 #define SECTOR_BITS 9
49 #define SECTOR_SIZE (1 << SECTOR_BITS)
51 typedef struct BlockDriverAIOCBSync {
52 BlockDriverAIOCB common;
53 QEMUBH *bh;
54 int ret;
55 /* vector translation state */
56 QEMUIOVector *qiov;
57 uint8_t *bounce;
58 int is_write;
59 } BlockDriverAIOCBSync;
61 static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
62 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
63 BlockDriverCompletionFunc *cb, void *opaque);
64 static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
65 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
66 BlockDriverCompletionFunc *cb, void *opaque);
67 static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb);
68 static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
69 uint8_t *buf, int nb_sectors);
70 static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
71 const uint8_t *buf, int nb_sectors);
73 BlockDriverState *bdrv_first;
75 static BlockDriver *first_drv;
77 int path_is_absolute(const char *path)
79 const char *p;
80 #ifdef _WIN32
81 /* specific case for names like: "\\.\d:" */
82 if (*path == '/' || *path == '\\')
83 return 1;
84 #endif
85 p = strchr(path, ':');
86 if (p)
87 p++;
88 else
89 p = path;
90 #ifdef _WIN32
91 return (*p == '/' || *p == '\\');
92 #else
93 return (*p == '/');
94 #endif
97 /* if filename is absolute, just copy it to dest. Otherwise, build a
98 path to it by considering it is relative to base_path. URL are
99 supported. */
100 void path_combine(char *dest, int dest_size,
101 const char *base_path,
102 const char *filename)
104 const char *p, *p1;
105 int len;
107 if (dest_size <= 0)
108 return;
109 if (path_is_absolute(filename)) {
110 pstrcpy(dest, dest_size, filename);
111 } else {
112 p = strchr(base_path, ':');
113 if (p)
114 p++;
115 else
116 p = base_path;
117 p1 = strrchr(base_path, '/');
118 #ifdef _WIN32
120 const char *p2;
121 p2 = strrchr(base_path, '\\');
122 if (!p1 || p2 > p1)
123 p1 = p2;
125 #endif
126 if (p1)
127 p1++;
128 else
129 p1 = base_path;
130 if (p1 > p)
131 p = p1;
132 len = p - base_path;
133 if (len > dest_size - 1)
134 len = dest_size - 1;
135 memcpy(dest, base_path, len);
136 dest[len] = '\0';
137 pstrcat(dest, dest_size, filename);
142 void bdrv_register(BlockDriver *bdrv)
144 if (!bdrv->bdrv_aio_readv) {
145 /* add AIO emulation layer */
146 bdrv->bdrv_aio_readv = bdrv_aio_readv_em;
147 bdrv->bdrv_aio_writev = bdrv_aio_writev_em;
148 bdrv->bdrv_aio_cancel = bdrv_aio_cancel_em;
149 bdrv->aiocb_size = sizeof(BlockDriverAIOCBSync);
150 } else if (!bdrv->bdrv_read) {
151 /* add synchronous IO emulation layer */
152 bdrv->bdrv_read = bdrv_read_em;
153 bdrv->bdrv_write = bdrv_write_em;
155 aio_pool_init(&bdrv->aio_pool, bdrv->aiocb_size, bdrv->bdrv_aio_cancel);
156 bdrv->next = first_drv;
157 first_drv = bdrv;
160 /* create a new block device (by default it is empty) */
161 BlockDriverState *bdrv_new(const char *device_name)
163 BlockDriverState **pbs, *bs;
165 bs = qemu_mallocz(sizeof(BlockDriverState));
166 pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
167 if (device_name[0] != '\0') {
168 /* insert at the end */
169 pbs = &bdrv_first;
170 while (*pbs != NULL)
171 pbs = &(*pbs)->next;
172 *pbs = bs;
174 return bs;
177 BlockDriver *bdrv_find_format(const char *format_name)
179 BlockDriver *drv1;
180 for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
181 if (!strcmp(drv1->format_name, format_name))
182 return drv1;
184 return NULL;
187 int bdrv_create2(BlockDriver *drv,
188 const char *filename, int64_t size_in_sectors,
189 const char *backing_file, const char *backing_format,
190 int flags)
192 if (drv->bdrv_create2)
193 return drv->bdrv_create2(filename, size_in_sectors, backing_file,
194 backing_format, flags);
195 if (drv->bdrv_create)
196 return drv->bdrv_create(filename, size_in_sectors, backing_file,
197 flags);
198 return -ENOTSUP;
201 int bdrv_create(BlockDriver *drv,
202 const char *filename, int64_t size_in_sectors,
203 const char *backing_file, int flags)
205 if (!drv->bdrv_create)
206 return -ENOTSUP;
207 return drv->bdrv_create(filename, size_in_sectors, backing_file, flags);
210 #ifdef _WIN32
211 void get_tmp_filename(char *filename, int size)
213 char temp_dir[MAX_PATH];
215 GetTempPath(MAX_PATH, temp_dir);
216 GetTempFileName(temp_dir, "qem", 0, filename);
218 #else
219 void get_tmp_filename(char *filename, int size)
221 int fd;
222 const char *tmpdir;
223 /* XXX: race condition possible */
224 tmpdir = getenv("TMPDIR");
225 if (!tmpdir)
226 tmpdir = "/tmp";
227 snprintf(filename, size, "%s/vl.XXXXXX", tmpdir);
228 fd = mkstemp(filename);
229 close(fd);
231 #endif
233 #ifdef _WIN32
234 static int is_windows_drive_prefix(const char *filename)
236 return (((filename[0] >= 'a' && filename[0] <= 'z') ||
237 (filename[0] >= 'A' && filename[0] <= 'Z')) &&
238 filename[1] == ':');
241 static int is_windows_drive(const char *filename)
243 if (is_windows_drive_prefix(filename) &&
244 filename[2] == '\0')
245 return 1;
246 if (strstart(filename, "\\\\.\\", NULL) ||
247 strstart(filename, "//./", NULL))
248 return 1;
249 return 0;
251 #endif
253 static BlockDriver *find_protocol(const char *filename)
255 BlockDriver *drv1;
256 char protocol[128];
257 int len;
258 const char *p;
260 #ifdef _WIN32
261 if (is_windows_drive(filename) ||
262 is_windows_drive_prefix(filename))
263 return bdrv_find_format("raw");
264 #endif
265 p = strchr(filename, ':');
266 if (!p)
267 return bdrv_find_format("raw");
268 len = p - filename;
269 if (len > sizeof(protocol) - 1)
270 len = sizeof(protocol) - 1;
271 memcpy(protocol, filename, len);
272 protocol[len] = '\0';
273 for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
274 if (drv1->protocol_name &&
275 !strcmp(drv1->protocol_name, protocol))
276 return drv1;
278 return NULL;
281 /* XXX: force raw format if block or character device ? It would
282 simplify the BSD case */
283 static BlockDriver *find_image_format(const char *filename)
285 int ret, score, score_max;
286 BlockDriver *drv1, *drv;
287 uint8_t buf[2048];
288 BlockDriverState *bs;
290 /* detect host devices. By convention, /dev/cdrom[N] is always
291 recognized as a host CDROM */
292 if (strstart(filename, "/dev/cdrom", NULL))
293 return bdrv_find_format("host_device");
294 #ifdef _WIN32
295 if (is_windows_drive(filename))
296 return bdrv_find_format("host_device");
297 #else
299 struct stat st;
300 if (stat(filename, &st) >= 0 &&
301 (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
302 return bdrv_find_format("host_device");
305 #endif
307 drv = find_protocol(filename);
308 /* no need to test disk image formats for vvfat */
309 if (strcmp(drv->format_name, "vvfat") == 0)
310 return drv;
312 ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY);
313 if (ret < 0)
314 return NULL;
315 ret = bdrv_pread(bs, 0, buf, sizeof(buf));
316 bdrv_delete(bs);
317 if (ret < 0) {
318 return NULL;
321 score_max = 0;
322 for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
323 if (drv1->bdrv_probe) {
324 score = drv1->bdrv_probe(buf, ret, filename);
325 if (score > score_max) {
326 score_max = score;
327 drv = drv1;
331 return drv;
334 int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags)
336 BlockDriverState *bs;
337 int ret;
339 bs = bdrv_new("");
340 ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL);
341 if (ret < 0) {
342 bdrv_delete(bs);
343 return ret;
345 bs->growable = 1;
346 *pbs = bs;
347 return 0;
350 int bdrv_open(BlockDriverState *bs, const char *filename, int flags)
352 return bdrv_open2(bs, filename, flags, NULL);
355 int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
356 BlockDriver *drv)
358 int ret, open_flags;
359 char tmp_filename[PATH_MAX];
360 char backing_filename[PATH_MAX];
362 bs->read_only = 0;
363 bs->is_temporary = 0;
364 bs->encrypted = 0;
365 bs->valid_key = 0;
366 /* buffer_alignment defaulted to 512, drivers can change this value */
367 bs->buffer_alignment = 512;
369 if (flags & BDRV_O_SNAPSHOT) {
370 BlockDriverState *bs1;
371 int64_t total_size;
372 int is_protocol = 0;
374 /* if snapshot, we create a temporary backing file and open it
375 instead of opening 'filename' directly */
377 /* if there is a backing file, use it */
378 bs1 = bdrv_new("");
379 ret = bdrv_open2(bs1, filename, 0, drv);
380 if (ret < 0) {
381 bdrv_delete(bs1);
382 return ret;
384 total_size = bdrv_getlength(bs1) >> SECTOR_BITS;
386 if (bs1->drv && bs1->drv->protocol_name)
387 is_protocol = 1;
389 bdrv_delete(bs1);
391 get_tmp_filename(tmp_filename, sizeof(tmp_filename));
393 /* Real path is meaningless for protocols */
394 if (is_protocol)
395 snprintf(backing_filename, sizeof(backing_filename),
396 "%s", filename);
397 else
398 realpath(filename, backing_filename);
400 ret = bdrv_create2(bdrv_find_format("qcow2"), tmp_filename,
401 total_size, backing_filename,
402 (drv ? drv->format_name : NULL), 0);
403 if (ret < 0) {
404 return ret;
406 filename = tmp_filename;
407 drv = bdrv_find_format("qcow2");
408 bs->is_temporary = 1;
411 pstrcpy(bs->filename, sizeof(bs->filename), filename);
412 if (flags & BDRV_O_FILE) {
413 drv = find_protocol(filename);
414 } else if (!drv) {
415 drv = find_image_format(filename);
417 if (!drv) {
418 ret = -ENOENT;
419 goto unlink_and_fail;
421 bs->drv = drv;
422 bs->opaque = qemu_mallocz(drv->instance_size);
423 /* Note: for compatibility, we open disk image files as RDWR, and
424 RDONLY as fallback */
425 if (!(flags & BDRV_O_FILE))
426 open_flags = BDRV_O_RDWR | (flags & BDRV_O_CACHE_MASK);
427 else
428 open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT);
429 ret = drv->bdrv_open(bs, filename, open_flags);
430 if ((ret == -EACCES || ret == -EPERM) && !(flags & BDRV_O_FILE)) {
431 ret = drv->bdrv_open(bs, filename, open_flags & ~BDRV_O_RDWR);
432 bs->read_only = 1;
434 if (ret < 0) {
435 qemu_free(bs->opaque);
436 bs->opaque = NULL;
437 bs->drv = NULL;
438 unlink_and_fail:
439 if (bs->is_temporary)
440 unlink(filename);
441 return ret;
443 if (drv->bdrv_getlength) {
444 bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
446 #ifndef _WIN32
447 if (bs->is_temporary) {
448 unlink(filename);
450 #endif
451 if (bs->backing_file[0] != '\0') {
452 /* if there is a backing file, use it */
453 BlockDriver *back_drv = NULL;
454 bs->backing_hd = bdrv_new("");
455 path_combine(backing_filename, sizeof(backing_filename),
456 filename, bs->backing_file);
457 if (bs->backing_format[0] != '\0')
458 back_drv = bdrv_find_format(bs->backing_format);
459 ret = bdrv_open2(bs->backing_hd, backing_filename, open_flags,
460 back_drv);
461 if (ret < 0) {
462 bdrv_close(bs);
463 return ret;
467 if (!bdrv_key_required(bs)) {
468 /* call the change callback */
469 bs->media_changed = 1;
470 if (bs->change_cb)
471 bs->change_cb(bs->change_opaque);
473 return 0;
476 void bdrv_close(BlockDriverState *bs)
478 if (bs->drv) {
479 if (bs->backing_hd)
480 bdrv_delete(bs->backing_hd);
481 bs->drv->bdrv_close(bs);
482 qemu_free(bs->opaque);
483 #ifdef _WIN32
484 if (bs->is_temporary) {
485 unlink(bs->filename);
487 #endif
488 bs->opaque = NULL;
489 bs->drv = NULL;
491 /* call the change callback */
492 bs->media_changed = 1;
493 if (bs->change_cb)
494 bs->change_cb(bs->change_opaque);
498 void bdrv_delete(BlockDriverState *bs)
500 BlockDriverState **pbs;
502 pbs = &bdrv_first;
503 while (*pbs != bs && *pbs != NULL)
504 pbs = &(*pbs)->next;
505 if (*pbs == bs)
506 *pbs = bs->next;
508 bdrv_close(bs);
509 qemu_free(bs);
513 * Run consistency checks on an image
515 * Returns the number of errors or -errno when an internal error occurs
517 int bdrv_check(BlockDriverState *bs)
519 if (bs->drv->bdrv_check == NULL) {
520 return -ENOTSUP;
523 return bs->drv->bdrv_check(bs);
526 /* commit COW file into the raw image */
527 int bdrv_commit(BlockDriverState *bs)
529 BlockDriver *drv = bs->drv;
530 int64_t i, total_sectors;
531 int n, j;
532 unsigned char sector[512];
534 if (!drv)
535 return -ENOMEDIUM;
537 if (bs->read_only) {
538 return -EACCES;
541 if (!bs->backing_hd) {
542 return -ENOTSUP;
545 total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
546 for (i = 0; i < total_sectors;) {
547 if (drv->bdrv_is_allocated(bs, i, 65536, &n)) {
548 for(j = 0; j < n; j++) {
549 if (bdrv_read(bs, i, sector, 1) != 0) {
550 return -EIO;
553 if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) {
554 return -EIO;
556 i++;
558 } else {
559 i += n;
563 if (drv->bdrv_make_empty)
564 return drv->bdrv_make_empty(bs);
566 return 0;
569 static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset,
570 size_t size)
572 int64_t len;
574 if (!bdrv_is_inserted(bs))
575 return -ENOMEDIUM;
577 if (bs->growable)
578 return 0;
580 len = bdrv_getlength(bs);
582 if (offset < 0)
583 return -EIO;
585 if ((offset > len) || (len - offset < size))
586 return -EIO;
588 return 0;
591 static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num,
592 int nb_sectors)
594 return bdrv_check_byte_request(bs, sector_num * 512, nb_sectors * 512);
597 /* return < 0 if error. See bdrv_write() for the return codes */
598 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
599 uint8_t *buf, int nb_sectors)
601 BlockDriver *drv = bs->drv;
603 if (!drv)
604 return -ENOMEDIUM;
605 if (bdrv_check_request(bs, sector_num, nb_sectors))
606 return -EIO;
608 return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
611 /* Return < 0 if error. Important errors are:
612 -EIO generic I/O error (may happen for all errors)
613 -ENOMEDIUM No media inserted.
614 -EINVAL Invalid sector number or nb_sectors
615 -EACCES Trying to write a read-only device
617 int bdrv_write(BlockDriverState *bs, int64_t sector_num,
618 const uint8_t *buf, int nb_sectors)
620 BlockDriver *drv = bs->drv;
621 if (!bs->drv)
622 return -ENOMEDIUM;
623 if (bs->read_only)
624 return -EACCES;
625 if (bdrv_check_request(bs, sector_num, nb_sectors))
626 return -EIO;
628 return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
631 int bdrv_pread(BlockDriverState *bs, int64_t offset,
632 void *buf, int count1)
634 uint8_t tmp_buf[SECTOR_SIZE];
635 int len, nb_sectors, count;
636 int64_t sector_num;
638 count = count1;
639 /* first read to align to sector start */
640 len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
641 if (len > count)
642 len = count;
643 sector_num = offset >> SECTOR_BITS;
644 if (len > 0) {
645 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
646 return -EIO;
647 memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len);
648 count -= len;
649 if (count == 0)
650 return count1;
651 sector_num++;
652 buf += len;
655 /* read the sectors "in place" */
656 nb_sectors = count >> SECTOR_BITS;
657 if (nb_sectors > 0) {
658 if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0)
659 return -EIO;
660 sector_num += nb_sectors;
661 len = nb_sectors << SECTOR_BITS;
662 buf += len;
663 count -= len;
666 /* add data from the last sector */
667 if (count > 0) {
668 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
669 return -EIO;
670 memcpy(buf, tmp_buf, count);
672 return count1;
675 int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
676 const void *buf, int count1)
678 uint8_t tmp_buf[SECTOR_SIZE];
679 int len, nb_sectors, count;
680 int64_t sector_num;
682 count = count1;
683 /* first write to align to sector start */
684 len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
685 if (len > count)
686 len = count;
687 sector_num = offset >> SECTOR_BITS;
688 if (len > 0) {
689 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
690 return -EIO;
691 memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len);
692 if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
693 return -EIO;
694 count -= len;
695 if (count == 0)
696 return count1;
697 sector_num++;
698 buf += len;
701 /* write the sectors "in place" */
702 nb_sectors = count >> SECTOR_BITS;
703 if (nb_sectors > 0) {
704 if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0)
705 return -EIO;
706 sector_num += nb_sectors;
707 len = nb_sectors << SECTOR_BITS;
708 buf += len;
709 count -= len;
712 /* add data from the last sector */
713 if (count > 0) {
714 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
715 return -EIO;
716 memcpy(tmp_buf, buf, count);
717 if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
718 return -EIO;
720 return count1;
724 * Truncate file to 'offset' bytes (needed only for file protocols)
726 int bdrv_truncate(BlockDriverState *bs, int64_t offset)
728 BlockDriver *drv = bs->drv;
729 if (!drv)
730 return -ENOMEDIUM;
731 if (!drv->bdrv_truncate)
732 return -ENOTSUP;
733 return drv->bdrv_truncate(bs, offset);
737 * Length of a file in bytes. Return < 0 if error or unknown.
739 int64_t bdrv_getlength(BlockDriverState *bs)
741 BlockDriver *drv = bs->drv;
742 if (!drv)
743 return -ENOMEDIUM;
744 if (!drv->bdrv_getlength) {
745 /* legacy mode */
746 return bs->total_sectors * SECTOR_SIZE;
748 return drv->bdrv_getlength(bs);
751 /* return 0 as number of sectors if no device present or error */
752 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
754 int64_t length;
755 length = bdrv_getlength(bs);
756 if (length < 0)
757 length = 0;
758 else
759 length = length >> SECTOR_BITS;
760 *nb_sectors_ptr = length;
763 struct partition {
764 uint8_t boot_ind; /* 0x80 - active */
765 uint8_t head; /* starting head */
766 uint8_t sector; /* starting sector */
767 uint8_t cyl; /* starting cylinder */
768 uint8_t sys_ind; /* What partition type */
769 uint8_t end_head; /* end head */
770 uint8_t end_sector; /* end sector */
771 uint8_t end_cyl; /* end cylinder */
772 uint32_t start_sect; /* starting sector counting from 0 */
773 uint32_t nr_sects; /* nr of sectors in partition */
774 } __attribute__((packed));
776 /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
777 static int guess_disk_lchs(BlockDriverState *bs,
778 int *pcylinders, int *pheads, int *psectors)
780 uint8_t buf[512];
781 int ret, i, heads, sectors, cylinders;
782 struct partition *p;
783 uint32_t nr_sects;
784 uint64_t nb_sectors;
786 bdrv_get_geometry(bs, &nb_sectors);
788 ret = bdrv_read(bs, 0, buf, 1);
789 if (ret < 0)
790 return -1;
791 /* test msdos magic */
792 if (buf[510] != 0x55 || buf[511] != 0xaa)
793 return -1;
794 for(i = 0; i < 4; i++) {
795 p = ((struct partition *)(buf + 0x1be)) + i;
796 nr_sects = le32_to_cpu(p->nr_sects);
797 if (nr_sects && p->end_head) {
798 /* We make the assumption that the partition terminates on
799 a cylinder boundary */
800 heads = p->end_head + 1;
801 sectors = p->end_sector & 63;
802 if (sectors == 0)
803 continue;
804 cylinders = nb_sectors / (heads * sectors);
805 if (cylinders < 1 || cylinders > 16383)
806 continue;
807 *pheads = heads;
808 *psectors = sectors;
809 *pcylinders = cylinders;
810 #if 0
811 printf("guessed geometry: LCHS=%d %d %d\n",
812 cylinders, heads, sectors);
813 #endif
814 return 0;
817 return -1;
820 void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs)
822 int translation, lba_detected = 0;
823 int cylinders, heads, secs;
824 uint64_t nb_sectors;
826 /* if a geometry hint is available, use it */
827 bdrv_get_geometry(bs, &nb_sectors);
828 bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs);
829 translation = bdrv_get_translation_hint(bs);
830 if (cylinders != 0) {
831 *pcyls = cylinders;
832 *pheads = heads;
833 *psecs = secs;
834 } else {
835 if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) {
836 if (heads > 16) {
837 /* if heads > 16, it means that a BIOS LBA
838 translation was active, so the default
839 hardware geometry is OK */
840 lba_detected = 1;
841 goto default_geometry;
842 } else {
843 *pcyls = cylinders;
844 *pheads = heads;
845 *psecs = secs;
846 /* disable any translation to be in sync with
847 the logical geometry */
848 if (translation == BIOS_ATA_TRANSLATION_AUTO) {
849 bdrv_set_translation_hint(bs,
850 BIOS_ATA_TRANSLATION_NONE);
853 } else {
854 default_geometry:
855 /* if no geometry, use a standard physical disk geometry */
856 cylinders = nb_sectors / (16 * 63);
858 if (cylinders > 16383)
859 cylinders = 16383;
860 else if (cylinders < 2)
861 cylinders = 2;
862 *pcyls = cylinders;
863 *pheads = 16;
864 *psecs = 63;
865 if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) {
866 if ((*pcyls * *pheads) <= 131072) {
867 bdrv_set_translation_hint(bs,
868 BIOS_ATA_TRANSLATION_LARGE);
869 } else {
870 bdrv_set_translation_hint(bs,
871 BIOS_ATA_TRANSLATION_LBA);
875 bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs);
879 void bdrv_set_geometry_hint(BlockDriverState *bs,
880 int cyls, int heads, int secs)
882 bs->cyls = cyls;
883 bs->heads = heads;
884 bs->secs = secs;
887 void bdrv_set_type_hint(BlockDriverState *bs, int type)
889 bs->type = type;
890 bs->removable = ((type == BDRV_TYPE_CDROM ||
891 type == BDRV_TYPE_FLOPPY));
894 void bdrv_set_translation_hint(BlockDriverState *bs, int translation)
896 bs->translation = translation;
899 void bdrv_get_geometry_hint(BlockDriverState *bs,
900 int *pcyls, int *pheads, int *psecs)
902 *pcyls = bs->cyls;
903 *pheads = bs->heads;
904 *psecs = bs->secs;
907 int bdrv_get_type_hint(BlockDriverState *bs)
909 return bs->type;
912 int bdrv_get_translation_hint(BlockDriverState *bs)
914 return bs->translation;
917 int bdrv_is_removable(BlockDriverState *bs)
919 return bs->removable;
922 int bdrv_is_read_only(BlockDriverState *bs)
924 return bs->read_only;
927 int bdrv_is_sg(BlockDriverState *bs)
929 return bs->sg;
932 /* XXX: no longer used */
933 void bdrv_set_change_cb(BlockDriverState *bs,
934 void (*change_cb)(void *opaque), void *opaque)
936 bs->change_cb = change_cb;
937 bs->change_opaque = opaque;
940 int bdrv_is_encrypted(BlockDriverState *bs)
942 if (bs->backing_hd && bs->backing_hd->encrypted)
943 return 1;
944 return bs->encrypted;
947 int bdrv_key_required(BlockDriverState *bs)
949 BlockDriverState *backing_hd = bs->backing_hd;
951 if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key)
952 return 1;
953 return (bs->encrypted && !bs->valid_key);
956 int bdrv_set_key(BlockDriverState *bs, const char *key)
958 int ret;
959 if (bs->backing_hd && bs->backing_hd->encrypted) {
960 ret = bdrv_set_key(bs->backing_hd, key);
961 if (ret < 0)
962 return ret;
963 if (!bs->encrypted)
964 return 0;
966 if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key)
967 return -1;
968 ret = bs->drv->bdrv_set_key(bs, key);
969 if (ret < 0) {
970 bs->valid_key = 0;
971 } else if (!bs->valid_key) {
972 bs->valid_key = 1;
973 /* call the change callback now, we skipped it on open */
974 bs->media_changed = 1;
975 if (bs->change_cb)
976 bs->change_cb(bs->change_opaque);
978 return ret;
981 void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size)
983 if (!bs->drv) {
984 buf[0] = '\0';
985 } else {
986 pstrcpy(buf, buf_size, bs->drv->format_name);
990 void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
991 void *opaque)
993 BlockDriver *drv;
995 for (drv = first_drv; drv != NULL; drv = drv->next) {
996 it(opaque, drv->format_name);
1000 BlockDriverState *bdrv_find(const char *name)
1002 BlockDriverState *bs;
1004 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
1005 if (!strcmp(name, bs->device_name))
1006 return bs;
1008 return NULL;
1011 void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque)
1013 BlockDriverState *bs;
1015 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
1016 it(opaque, bs);
1020 const char *bdrv_get_device_name(BlockDriverState *bs)
1022 return bs->device_name;
1025 void bdrv_flush(BlockDriverState *bs)
1027 if (!bs->drv)
1028 return;
1029 if (bs->drv->bdrv_flush)
1030 bs->drv->bdrv_flush(bs);
1031 if (bs->backing_hd)
1032 bdrv_flush(bs->backing_hd);
1035 void bdrv_flush_all(void)
1037 BlockDriverState *bs;
1039 for (bs = bdrv_first; bs != NULL; bs = bs->next)
1040 if (bs->drv && !bdrv_is_read_only(bs) &&
1041 (!bdrv_is_removable(bs) || bdrv_is_inserted(bs)))
1042 bdrv_flush(bs);
1046 * Returns true iff the specified sector is present in the disk image. Drivers
1047 * not implementing the functionality are assumed to not support backing files,
1048 * hence all their sectors are reported as allocated.
1050 * 'pnum' is set to the number of sectors (including and immediately following
1051 * the specified sector) that are known to be in the same
1052 * allocated/unallocated state.
1054 * 'nb_sectors' is the max value 'pnum' should be set to.
1056 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
1057 int *pnum)
1059 int64_t n;
1060 if (!bs->drv->bdrv_is_allocated) {
1061 if (sector_num >= bs->total_sectors) {
1062 *pnum = 0;
1063 return 0;
1065 n = bs->total_sectors - sector_num;
1066 *pnum = (n < nb_sectors) ? (n) : (nb_sectors);
1067 return 1;
1069 return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
1072 void bdrv_info(Monitor *mon)
1074 BlockDriverState *bs;
1076 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
1077 monitor_printf(mon, "%s:", bs->device_name);
1078 monitor_printf(mon, " type=");
1079 switch(bs->type) {
1080 case BDRV_TYPE_HD:
1081 monitor_printf(mon, "hd");
1082 break;
1083 case BDRV_TYPE_CDROM:
1084 monitor_printf(mon, "cdrom");
1085 break;
1086 case BDRV_TYPE_FLOPPY:
1087 monitor_printf(mon, "floppy");
1088 break;
1090 monitor_printf(mon, " removable=%d", bs->removable);
1091 if (bs->removable) {
1092 monitor_printf(mon, " locked=%d", bs->locked);
1094 if (bs->drv) {
1095 monitor_printf(mon, " file=");
1096 monitor_print_filename(mon, bs->filename);
1097 if (bs->backing_file[0] != '\0') {
1098 monitor_printf(mon, " backing_file=");
1099 monitor_print_filename(mon, bs->backing_file);
1101 monitor_printf(mon, " ro=%d", bs->read_only);
1102 monitor_printf(mon, " drv=%s", bs->drv->format_name);
1103 monitor_printf(mon, " encrypted=%d", bdrv_is_encrypted(bs));
1104 } else {
1105 monitor_printf(mon, " [not inserted]");
1107 monitor_printf(mon, "\n");
1111 /* The "info blockstats" command. */
1112 void bdrv_info_stats(Monitor *mon)
1114 BlockDriverState *bs;
1116 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
1117 monitor_printf(mon, "%s:"
1118 " rd_bytes=%" PRIu64
1119 " wr_bytes=%" PRIu64
1120 " rd_operations=%" PRIu64
1121 " wr_operations=%" PRIu64
1122 "\n",
1123 bs->device_name,
1124 bs->rd_bytes, bs->wr_bytes,
1125 bs->rd_ops, bs->wr_ops);
1129 const char *bdrv_get_encrypted_filename(BlockDriverState *bs)
1131 if (bs->backing_hd && bs->backing_hd->encrypted)
1132 return bs->backing_file;
1133 else if (bs->encrypted)
1134 return bs->filename;
1135 else
1136 return NULL;
1139 void bdrv_get_backing_filename(BlockDriverState *bs,
1140 char *filename, int filename_size)
1142 if (!bs->backing_hd) {
1143 pstrcpy(filename, filename_size, "");
1144 } else {
1145 pstrcpy(filename, filename_size, bs->backing_file);
1149 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
1150 const uint8_t *buf, int nb_sectors)
1152 BlockDriver *drv = bs->drv;
1153 if (!drv)
1154 return -ENOMEDIUM;
1155 if (!drv->bdrv_write_compressed)
1156 return -ENOTSUP;
1157 if (bdrv_check_request(bs, sector_num, nb_sectors))
1158 return -EIO;
1159 return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
1162 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
1164 BlockDriver *drv = bs->drv;
1165 if (!drv)
1166 return -ENOMEDIUM;
1167 if (!drv->bdrv_get_info)
1168 return -ENOTSUP;
1169 memset(bdi, 0, sizeof(*bdi));
1170 return drv->bdrv_get_info(bs, bdi);
1173 int bdrv_put_buffer(BlockDriverState *bs, const uint8_t *buf, int64_t pos, int size)
1175 BlockDriver *drv = bs->drv;
1176 if (!drv)
1177 return -ENOMEDIUM;
1178 if (!drv->bdrv_put_buffer)
1179 return -ENOTSUP;
1180 return drv->bdrv_put_buffer(bs, buf, pos, size);
1183 int bdrv_get_buffer(BlockDriverState *bs, uint8_t *buf, int64_t pos, int size)
1185 BlockDriver *drv = bs->drv;
1186 if (!drv)
1187 return -ENOMEDIUM;
1188 if (!drv->bdrv_get_buffer)
1189 return -ENOTSUP;
1190 return drv->bdrv_get_buffer(bs, buf, pos, size);
1193 /**************************************************************/
1194 /* handling of snapshots */
1196 int bdrv_snapshot_create(BlockDriverState *bs,
1197 QEMUSnapshotInfo *sn_info)
1199 BlockDriver *drv = bs->drv;
1200 if (!drv)
1201 return -ENOMEDIUM;
1202 if (!drv->bdrv_snapshot_create)
1203 return -ENOTSUP;
1204 return drv->bdrv_snapshot_create(bs, sn_info);
1207 int bdrv_snapshot_goto(BlockDriverState *bs,
1208 const char *snapshot_id)
1210 BlockDriver *drv = bs->drv;
1211 if (!drv)
1212 return -ENOMEDIUM;
1213 if (!drv->bdrv_snapshot_goto)
1214 return -ENOTSUP;
1215 return drv->bdrv_snapshot_goto(bs, snapshot_id);
1218 int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
1220 BlockDriver *drv = bs->drv;
1221 if (!drv)
1222 return -ENOMEDIUM;
1223 if (!drv->bdrv_snapshot_delete)
1224 return -ENOTSUP;
1225 return drv->bdrv_snapshot_delete(bs, snapshot_id);
1228 int bdrv_snapshot_list(BlockDriverState *bs,
1229 QEMUSnapshotInfo **psn_info)
1231 BlockDriver *drv = bs->drv;
1232 if (!drv)
1233 return -ENOMEDIUM;
1234 if (!drv->bdrv_snapshot_list)
1235 return -ENOTSUP;
1236 return drv->bdrv_snapshot_list(bs, psn_info);
1239 #define NB_SUFFIXES 4
1241 char *get_human_readable_size(char *buf, int buf_size, int64_t size)
1243 static const char suffixes[NB_SUFFIXES] = "KMGT";
1244 int64_t base;
1245 int i;
1247 if (size <= 999) {
1248 snprintf(buf, buf_size, "%" PRId64, size);
1249 } else {
1250 base = 1024;
1251 for(i = 0; i < NB_SUFFIXES; i++) {
1252 if (size < (10 * base)) {
1253 snprintf(buf, buf_size, "%0.1f%c",
1254 (double)size / base,
1255 suffixes[i]);
1256 break;
1257 } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) {
1258 snprintf(buf, buf_size, "%" PRId64 "%c",
1259 ((size + (base >> 1)) / base),
1260 suffixes[i]);
1261 break;
1263 base = base * 1024;
1266 return buf;
1269 char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn)
1271 char buf1[128], date_buf[128], clock_buf[128];
1272 #ifdef _WIN32
1273 struct tm *ptm;
1274 #else
1275 struct tm tm;
1276 #endif
1277 time_t ti;
1278 int64_t secs;
1280 if (!sn) {
1281 snprintf(buf, buf_size,
1282 "%-10s%-20s%7s%20s%15s",
1283 "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
1284 } else {
1285 ti = sn->date_sec;
1286 #ifdef _WIN32
1287 ptm = localtime(&ti);
1288 strftime(date_buf, sizeof(date_buf),
1289 "%Y-%m-%d %H:%M:%S", ptm);
1290 #else
1291 localtime_r(&ti, &tm);
1292 strftime(date_buf, sizeof(date_buf),
1293 "%Y-%m-%d %H:%M:%S", &tm);
1294 #endif
1295 secs = sn->vm_clock_nsec / 1000000000;
1296 snprintf(clock_buf, sizeof(clock_buf),
1297 "%02d:%02d:%02d.%03d",
1298 (int)(secs / 3600),
1299 (int)((secs / 60) % 60),
1300 (int)(secs % 60),
1301 (int)((sn->vm_clock_nsec / 1000000) % 1000));
1302 snprintf(buf, buf_size,
1303 "%-10s%-20s%7s%20s%15s",
1304 sn->id_str, sn->name,
1305 get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
1306 date_buf,
1307 clock_buf);
1309 return buf;
1313 /**************************************************************/
1314 /* async I/Os */
1316 BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
1317 QEMUIOVector *qiov, int nb_sectors,
1318 BlockDriverCompletionFunc *cb, void *opaque)
1320 BlockDriver *drv = bs->drv;
1321 BlockDriverAIOCB *ret;
1323 if (!drv)
1324 return NULL;
1325 if (bdrv_check_request(bs, sector_num, nb_sectors))
1326 return NULL;
1328 ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors,
1329 cb, opaque);
1331 if (ret) {
1332 /* Update stats even though technically transfer has not happened. */
1333 bs->rd_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
1334 bs->rd_ops ++;
1337 return ret;
1340 BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
1341 QEMUIOVector *qiov, int nb_sectors,
1342 BlockDriverCompletionFunc *cb, void *opaque)
1344 BlockDriver *drv = bs->drv;
1345 BlockDriverAIOCB *ret;
1347 if (!drv)
1348 return NULL;
1349 if (bs->read_only)
1350 return NULL;
1351 if (bdrv_check_request(bs, sector_num, nb_sectors))
1352 return NULL;
1354 ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors,
1355 cb, opaque);
1357 if (ret) {
1358 /* Update stats even though technically transfer has not happened. */
1359 bs->wr_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
1360 bs->wr_ops ++;
1363 return ret;
1366 void bdrv_aio_cancel(BlockDriverAIOCB *acb)
1368 acb->pool->cancel(acb);
1372 /**************************************************************/
1373 /* async block device emulation */
1375 static void bdrv_aio_bh_cb(void *opaque)
1377 BlockDriverAIOCBSync *acb = opaque;
1379 if (!acb->is_write)
1380 qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size);
1381 qemu_vfree(acb->bounce);
1382 acb->common.cb(acb->common.opaque, acb->ret);
1384 qemu_aio_release(acb);
1387 static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
1388 int64_t sector_num,
1389 QEMUIOVector *qiov,
1390 int nb_sectors,
1391 BlockDriverCompletionFunc *cb,
1392 void *opaque,
1393 int is_write)
1396 BlockDriverAIOCBSync *acb;
1398 acb = qemu_aio_get(bs, cb, opaque);
1399 acb->is_write = is_write;
1400 acb->qiov = qiov;
1401 acb->bounce = qemu_blockalign(bs, qiov->size);
1403 if (!acb->bh)
1404 acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
1406 if (is_write) {
1407 qemu_iovec_to_buffer(acb->qiov, acb->bounce);
1408 acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors);
1409 } else {
1410 acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors);
1413 qemu_bh_schedule(acb->bh);
1415 return &acb->common;
1418 static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
1419 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
1420 BlockDriverCompletionFunc *cb, void *opaque)
1422 return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0);
1425 static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
1426 int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
1427 BlockDriverCompletionFunc *cb, void *opaque)
1429 return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1);
1433 static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb)
1435 BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb;
1436 qemu_bh_cancel(acb->bh);
1437 qemu_aio_release(acb);
1440 /**************************************************************/
1441 /* sync block device emulation */
1443 static void bdrv_rw_em_cb(void *opaque, int ret)
1445 *(int *)opaque = ret;
1448 #define NOT_DONE 0x7fffffff
1450 static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
1451 uint8_t *buf, int nb_sectors)
1453 int async_ret;
1454 BlockDriverAIOCB *acb;
1455 struct iovec iov;
1456 QEMUIOVector qiov;
1458 async_ret = NOT_DONE;
1459 iov.iov_base = (void *)buf;
1460 iov.iov_len = nb_sectors * 512;
1461 qemu_iovec_init_external(&qiov, &iov, 1);
1462 acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors,
1463 bdrv_rw_em_cb, &async_ret);
1464 if (acb == NULL)
1465 return -1;
1467 while (async_ret == NOT_DONE) {
1468 qemu_aio_wait();
1471 return async_ret;
1474 static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
1475 const uint8_t *buf, int nb_sectors)
1477 int async_ret;
1478 BlockDriverAIOCB *acb;
1479 struct iovec iov;
1480 QEMUIOVector qiov;
1482 async_ret = NOT_DONE;
1483 iov.iov_base = (void *)buf;
1484 iov.iov_len = nb_sectors * 512;
1485 qemu_iovec_init_external(&qiov, &iov, 1);
1486 acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors,
1487 bdrv_rw_em_cb, &async_ret);
1488 if (acb == NULL)
1489 return -1;
1490 while (async_ret == NOT_DONE) {
1491 qemu_aio_wait();
1493 return async_ret;
1496 void bdrv_init(void)
1498 module_call_init(MODULE_INIT_BLOCK);
1501 void aio_pool_init(AIOPool *pool, int aiocb_size,
1502 void (*cancel)(BlockDriverAIOCB *acb))
1504 pool->aiocb_size = aiocb_size;
1505 pool->cancel = cancel;
1506 pool->free_aiocb = NULL;
1509 void *qemu_aio_get_pool(AIOPool *pool, BlockDriverState *bs,
1510 BlockDriverCompletionFunc *cb, void *opaque)
1512 BlockDriverAIOCB *acb;
1514 if (pool->free_aiocb) {
1515 acb = pool->free_aiocb;
1516 pool->free_aiocb = acb->next;
1517 } else {
1518 acb = qemu_mallocz(pool->aiocb_size);
1519 acb->pool = pool;
1521 acb->bs = bs;
1522 acb->cb = cb;
1523 acb->opaque = opaque;
1524 return acb;
1527 void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb,
1528 void *opaque)
1530 return qemu_aio_get_pool(&bs->drv->aio_pool, bs, cb, opaque);
1533 void qemu_aio_release(void *p)
1535 BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p;
1536 AIOPool *pool = acb->pool;
1537 acb->next = pool->free_aiocb;
1538 pool->free_aiocb = acb;
1541 /**************************************************************/
1542 /* removable device support */
1545 * Return TRUE if the media is present
1547 int bdrv_is_inserted(BlockDriverState *bs)
1549 BlockDriver *drv = bs->drv;
1550 int ret;
1551 if (!drv)
1552 return 0;
1553 if (!drv->bdrv_is_inserted)
1554 return 1;
1555 ret = drv->bdrv_is_inserted(bs);
1556 return ret;
1560 * Return TRUE if the media changed since the last call to this
1561 * function. It is currently only used for floppy disks
1563 int bdrv_media_changed(BlockDriverState *bs)
1565 BlockDriver *drv = bs->drv;
1566 int ret;
1568 if (!drv || !drv->bdrv_media_changed)
1569 ret = -ENOTSUP;
1570 else
1571 ret = drv->bdrv_media_changed(bs);
1572 if (ret == -ENOTSUP)
1573 ret = bs->media_changed;
1574 bs->media_changed = 0;
1575 return ret;
1579 * If eject_flag is TRUE, eject the media. Otherwise, close the tray
1581 void bdrv_eject(BlockDriverState *bs, int eject_flag)
1583 BlockDriver *drv = bs->drv;
1584 int ret;
1586 if (!drv || !drv->bdrv_eject) {
1587 ret = -ENOTSUP;
1588 } else {
1589 ret = drv->bdrv_eject(bs, eject_flag);
1591 if (ret == -ENOTSUP) {
1592 if (eject_flag)
1593 bdrv_close(bs);
1597 int bdrv_is_locked(BlockDriverState *bs)
1599 return bs->locked;
1603 * Lock or unlock the media (if it is locked, the user won't be able
1604 * to eject it manually).
1606 void bdrv_set_locked(BlockDriverState *bs, int locked)
1608 BlockDriver *drv = bs->drv;
1610 bs->locked = locked;
1611 if (drv && drv->bdrv_set_locked) {
1612 drv->bdrv_set_locked(bs, locked);
1616 /* needed for generic scsi interface */
1618 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
1620 BlockDriver *drv = bs->drv;
1622 if (drv && drv->bdrv_ioctl)
1623 return drv->bdrv_ioctl(bs, req, buf);
1624 return -ENOTSUP;
1627 BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
1628 unsigned long int req, void *buf,
1629 BlockDriverCompletionFunc *cb, void *opaque)
1631 BlockDriver *drv = bs->drv;
1633 if (drv && drv->bdrv_aio_ioctl)
1634 return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque);
1635 return NULL;
1638 void *qemu_blockalign(BlockDriverState *bs, size_t size)
1640 return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size);