block: Polish error handling of brdv_open2 (Jan Kiszka)
[qemu/mini2440/sniper_sniper_test.git] / block.c
blob892c47ad8124bb41cf47dfacb12890b439c0a543
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 _BSD
26 /* include native header before sys-queue.h */
27 #include <sys/queue.h>
28 #endif
30 #include "qemu-common.h"
31 #include "console.h"
32 #include "block_int.h"
34 #ifdef _BSD
35 #include <sys/types.h>
36 #include <sys/stat.h>
37 #include <sys/ioctl.h>
38 #include <sys/disk.h>
39 #endif
41 #define SECTOR_BITS 9
42 #define SECTOR_SIZE (1 << SECTOR_BITS)
44 typedef struct BlockDriverAIOCBSync {
45 BlockDriverAIOCB common;
46 QEMUBH *bh;
47 int ret;
48 } BlockDriverAIOCBSync;
50 static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
51 int64_t sector_num, uint8_t *buf, int nb_sectors,
52 BlockDriverCompletionFunc *cb, void *opaque);
53 static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
54 int64_t sector_num, const uint8_t *buf, int nb_sectors,
55 BlockDriverCompletionFunc *cb, void *opaque);
56 static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb);
57 static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
58 uint8_t *buf, int nb_sectors);
59 static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
60 const uint8_t *buf, int nb_sectors);
62 BlockDriverState *bdrv_first;
64 static BlockDriver *first_drv;
66 int path_is_absolute(const char *path)
68 const char *p;
69 #ifdef _WIN32
70 /* specific case for names like: "\\.\d:" */
71 if (*path == '/' || *path == '\\')
72 return 1;
73 #endif
74 p = strchr(path, ':');
75 if (p)
76 p++;
77 else
78 p = path;
79 #ifdef _WIN32
80 return (*p == '/' || *p == '\\');
81 #else
82 return (*p == '/');
83 #endif
86 /* if filename is absolute, just copy it to dest. Otherwise, build a
87 path to it by considering it is relative to base_path. URL are
88 supported. */
89 void path_combine(char *dest, int dest_size,
90 const char *base_path,
91 const char *filename)
93 const char *p, *p1;
94 int len;
96 if (dest_size <= 0)
97 return;
98 if (path_is_absolute(filename)) {
99 pstrcpy(dest, dest_size, filename);
100 } else {
101 p = strchr(base_path, ':');
102 if (p)
103 p++;
104 else
105 p = base_path;
106 p1 = strrchr(base_path, '/');
107 #ifdef _WIN32
109 const char *p2;
110 p2 = strrchr(base_path, '\\');
111 if (!p1 || p2 > p1)
112 p1 = p2;
114 #endif
115 if (p1)
116 p1++;
117 else
118 p1 = base_path;
119 if (p1 > p)
120 p = p1;
121 len = p - base_path;
122 if (len > dest_size - 1)
123 len = dest_size - 1;
124 memcpy(dest, base_path, len);
125 dest[len] = '\0';
126 pstrcat(dest, dest_size, filename);
131 static void bdrv_register(BlockDriver *bdrv)
133 if (!bdrv->bdrv_aio_read) {
134 /* add AIO emulation layer */
135 bdrv->bdrv_aio_read = bdrv_aio_read_em;
136 bdrv->bdrv_aio_write = bdrv_aio_write_em;
137 bdrv->bdrv_aio_cancel = bdrv_aio_cancel_em;
138 bdrv->aiocb_size = sizeof(BlockDriverAIOCBSync);
139 } else if (!bdrv->bdrv_read && !bdrv->bdrv_pread) {
140 /* add synchronous IO emulation layer */
141 bdrv->bdrv_read = bdrv_read_em;
142 bdrv->bdrv_write = bdrv_write_em;
144 bdrv->next = first_drv;
145 first_drv = bdrv;
148 /* create a new block device (by default it is empty) */
149 BlockDriverState *bdrv_new(const char *device_name)
151 BlockDriverState **pbs, *bs;
153 bs = qemu_mallocz(sizeof(BlockDriverState));
154 pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
155 if (device_name[0] != '\0') {
156 /* insert at the end */
157 pbs = &bdrv_first;
158 while (*pbs != NULL)
159 pbs = &(*pbs)->next;
160 *pbs = bs;
162 return bs;
165 BlockDriver *bdrv_find_format(const char *format_name)
167 BlockDriver *drv1;
168 for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
169 if (!strcmp(drv1->format_name, format_name))
170 return drv1;
172 return NULL;
175 int bdrv_create(BlockDriver *drv,
176 const char *filename, int64_t size_in_sectors,
177 const char *backing_file, int flags)
179 if (!drv->bdrv_create)
180 return -ENOTSUP;
181 return drv->bdrv_create(filename, size_in_sectors, backing_file, flags);
184 #ifdef _WIN32
185 void get_tmp_filename(char *filename, int size)
187 char temp_dir[MAX_PATH];
189 GetTempPath(MAX_PATH, temp_dir);
190 GetTempFileName(temp_dir, "qem", 0, filename);
192 #else
193 void get_tmp_filename(char *filename, int size)
195 int fd;
196 const char *tmpdir;
197 /* XXX: race condition possible */
198 tmpdir = getenv("TMPDIR");
199 if (!tmpdir)
200 tmpdir = "/tmp";
201 snprintf(filename, size, "%s/vl.XXXXXX", tmpdir);
202 fd = mkstemp(filename);
203 close(fd);
205 #endif
207 #ifdef _WIN32
208 static int is_windows_drive_prefix(const char *filename)
210 return (((filename[0] >= 'a' && filename[0] <= 'z') ||
211 (filename[0] >= 'A' && filename[0] <= 'Z')) &&
212 filename[1] == ':');
215 static int is_windows_drive(const char *filename)
217 if (is_windows_drive_prefix(filename) &&
218 filename[2] == '\0')
219 return 1;
220 if (strstart(filename, "\\\\.\\", NULL) ||
221 strstart(filename, "//./", NULL))
222 return 1;
223 return 0;
225 #endif
227 static BlockDriver *find_protocol(const char *filename)
229 BlockDriver *drv1;
230 char protocol[128];
231 int len;
232 const char *p;
234 #ifdef _WIN32
235 if (is_windows_drive(filename) ||
236 is_windows_drive_prefix(filename))
237 return &bdrv_raw;
238 #endif
239 p = strchr(filename, ':');
240 if (!p)
241 return &bdrv_raw;
242 len = p - filename;
243 if (len > sizeof(protocol) - 1)
244 len = sizeof(protocol) - 1;
245 memcpy(protocol, filename, len);
246 protocol[len] = '\0';
247 for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
248 if (drv1->protocol_name &&
249 !strcmp(drv1->protocol_name, protocol))
250 return drv1;
252 return NULL;
255 /* XXX: force raw format if block or character device ? It would
256 simplify the BSD case */
257 static BlockDriver *find_image_format(const char *filename)
259 int ret, score, score_max;
260 BlockDriver *drv1, *drv;
261 uint8_t buf[2048];
262 BlockDriverState *bs;
264 /* detect host devices. By convention, /dev/cdrom[N] is always
265 recognized as a host CDROM */
266 if (strstart(filename, "/dev/cdrom", NULL))
267 return &bdrv_host_device;
268 #ifdef _WIN32
269 if (is_windows_drive(filename))
270 return &bdrv_host_device;
271 #else
273 struct stat st;
274 if (stat(filename, &st) >= 0 &&
275 (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
276 return &bdrv_host_device;
279 #endif
281 drv = find_protocol(filename);
282 /* no need to test disk image formats for vvfat */
283 if (drv == &bdrv_vvfat)
284 return drv;
286 ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY);
287 if (ret < 0)
288 return NULL;
289 ret = bdrv_pread(bs, 0, buf, sizeof(buf));
290 bdrv_delete(bs);
291 if (ret < 0) {
292 return NULL;
295 score_max = 0;
296 for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
297 if (drv1->bdrv_probe) {
298 score = drv1->bdrv_probe(buf, ret, filename);
299 if (score > score_max) {
300 score_max = score;
301 drv = drv1;
305 return drv;
308 int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags)
310 BlockDriverState *bs;
311 int ret;
313 bs = bdrv_new("");
314 ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL);
315 if (ret < 0) {
316 bdrv_delete(bs);
317 return ret;
319 bs->growable = 1;
320 *pbs = bs;
321 return 0;
324 int bdrv_open(BlockDriverState *bs, const char *filename, int flags)
326 return bdrv_open2(bs, filename, flags, NULL);
329 int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
330 BlockDriver *drv)
332 int ret, open_flags;
333 char tmp_filename[PATH_MAX];
334 char backing_filename[PATH_MAX];
336 bs->read_only = 0;
337 bs->is_temporary = 0;
338 bs->encrypted = 0;
340 if (flags & BDRV_O_SNAPSHOT) {
341 BlockDriverState *bs1;
342 int64_t total_size;
343 int is_protocol = 0;
345 /* if snapshot, we create a temporary backing file and open it
346 instead of opening 'filename' directly */
348 /* if there is a backing file, use it */
349 bs1 = bdrv_new("");
350 ret = bdrv_open(bs1, filename, 0);
351 if (ret < 0) {
352 bdrv_delete(bs1);
353 return ret;
355 total_size = bdrv_getlength(bs1) >> SECTOR_BITS;
357 if (bs1->drv && bs1->drv->protocol_name)
358 is_protocol = 1;
360 bdrv_delete(bs1);
362 get_tmp_filename(tmp_filename, sizeof(tmp_filename));
364 /* Real path is meaningless for protocols */
365 if (is_protocol)
366 snprintf(backing_filename, sizeof(backing_filename),
367 "%s", filename);
368 else
369 realpath(filename, backing_filename);
371 ret = bdrv_create(&bdrv_qcow2, tmp_filename,
372 total_size, backing_filename, 0);
373 if (ret < 0) {
374 return ret;
376 filename = tmp_filename;
377 bs->is_temporary = 1;
380 pstrcpy(bs->filename, sizeof(bs->filename), filename);
381 if (flags & BDRV_O_FILE) {
382 drv = find_protocol(filename);
383 } else if (!drv) {
384 drv = find_image_format(filename);
386 if (!drv) {
387 ret = -ENOENT;
388 goto unlink_and_fail;
390 bs->drv = drv;
391 bs->opaque = qemu_mallocz(drv->instance_size);
392 /* Note: for compatibility, we open disk image files as RDWR, and
393 RDONLY as fallback */
394 if (!(flags & BDRV_O_FILE))
395 open_flags = BDRV_O_RDWR | (flags & BDRV_O_CACHE_MASK);
396 else
397 open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT);
398 ret = drv->bdrv_open(bs, filename, open_flags);
399 if ((ret == -EACCES || ret == -EPERM) && !(flags & BDRV_O_FILE)) {
400 ret = drv->bdrv_open(bs, filename, open_flags & ~BDRV_O_RDWR);
401 bs->read_only = 1;
403 if (ret < 0) {
404 qemu_free(bs->opaque);
405 bs->opaque = NULL;
406 bs->drv = NULL;
407 unlink_and_fail:
408 if (bs->is_temporary)
409 unlink(filename);
410 return ret;
412 if (drv->bdrv_getlength) {
413 bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
415 #ifndef _WIN32
416 if (bs->is_temporary) {
417 unlink(filename);
419 #endif
420 if (bs->backing_file[0] != '\0') {
421 /* if there is a backing file, use it */
422 bs->backing_hd = bdrv_new("");
423 path_combine(backing_filename, sizeof(backing_filename),
424 filename, bs->backing_file);
425 ret = bdrv_open(bs->backing_hd, backing_filename, open_flags);
426 if (ret < 0) {
427 bdrv_close(bs);
428 return ret;
432 /* call the change callback */
433 bs->media_changed = 1;
434 if (bs->change_cb)
435 bs->change_cb(bs->change_opaque);
437 return 0;
440 void bdrv_close(BlockDriverState *bs)
442 if (bs->drv) {
443 if (bs->backing_hd)
444 bdrv_delete(bs->backing_hd);
445 bs->drv->bdrv_close(bs);
446 qemu_free(bs->opaque);
447 #ifdef _WIN32
448 if (bs->is_temporary) {
449 unlink(bs->filename);
451 #endif
452 bs->opaque = NULL;
453 bs->drv = NULL;
455 /* call the change callback */
456 bs->media_changed = 1;
457 if (bs->change_cb)
458 bs->change_cb(bs->change_opaque);
462 void bdrv_delete(BlockDriverState *bs)
464 BlockDriverState **pbs;
466 pbs = &bdrv_first;
467 while (*pbs != bs && *pbs != NULL)
468 pbs = &(*pbs)->next;
469 if (*pbs == bs)
470 *pbs = bs->next;
472 bdrv_close(bs);
473 qemu_free(bs);
476 /* commit COW file into the raw image */
477 int bdrv_commit(BlockDriverState *bs)
479 BlockDriver *drv = bs->drv;
480 int64_t i, total_sectors;
481 int n, j;
482 unsigned char sector[512];
484 if (!drv)
485 return -ENOMEDIUM;
487 if (bs->read_only) {
488 return -EACCES;
491 if (!bs->backing_hd) {
492 return -ENOTSUP;
495 total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
496 for (i = 0; i < total_sectors;) {
497 if (drv->bdrv_is_allocated(bs, i, 65536, &n)) {
498 for(j = 0; j < n; j++) {
499 if (bdrv_read(bs, i, sector, 1) != 0) {
500 return -EIO;
503 if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) {
504 return -EIO;
506 i++;
508 } else {
509 i += n;
513 if (drv->bdrv_make_empty)
514 return drv->bdrv_make_empty(bs);
516 return 0;
519 static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset,
520 size_t size)
522 int64_t len;
524 if (!bdrv_is_inserted(bs))
525 return -ENOMEDIUM;
527 if (bs->growable)
528 return 0;
530 len = bdrv_getlength(bs);
532 if ((offset + size) > len)
533 return -EIO;
535 return 0;
538 static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num,
539 int nb_sectors)
541 int64_t offset;
543 /* Deal with byte accesses */
544 if (sector_num < 0)
545 offset = -sector_num;
546 else
547 offset = sector_num * 512;
549 return bdrv_check_byte_request(bs, offset, nb_sectors * 512);
552 /* return < 0 if error. See bdrv_write() for the return codes */
553 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
554 uint8_t *buf, int nb_sectors)
556 BlockDriver *drv = bs->drv;
558 if (!drv)
559 return -ENOMEDIUM;
560 if (bdrv_check_request(bs, sector_num, nb_sectors))
561 return -EIO;
563 if (drv->bdrv_pread) {
564 int ret, len;
565 len = nb_sectors * 512;
566 ret = drv->bdrv_pread(bs, sector_num * 512, buf, len);
567 if (ret < 0)
568 return ret;
569 else if (ret != len)
570 return -EINVAL;
571 else {
572 bs->rd_bytes += (unsigned) len;
573 bs->rd_ops ++;
574 return 0;
576 } else {
577 return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
581 /* Return < 0 if error. Important errors are:
582 -EIO generic I/O error (may happen for all errors)
583 -ENOMEDIUM No media inserted.
584 -EINVAL Invalid sector number or nb_sectors
585 -EACCES Trying to write a read-only device
587 int bdrv_write(BlockDriverState *bs, int64_t sector_num,
588 const uint8_t *buf, int nb_sectors)
590 BlockDriver *drv = bs->drv;
591 if (!bs->drv)
592 return -ENOMEDIUM;
593 if (bs->read_only)
594 return -EACCES;
595 if (bdrv_check_request(bs, sector_num, nb_sectors))
596 return -EIO;
598 if (drv->bdrv_pwrite) {
599 int ret, len, count = 0;
600 len = nb_sectors * 512;
601 do {
602 ret = drv->bdrv_pwrite(bs, sector_num * 512, buf, len - count);
603 if (ret < 0) {
604 printf("bdrv_write ret=%d\n", ret);
605 return ret;
607 count += ret;
608 buf += ret;
609 } while (count != len);
610 bs->wr_bytes += (unsigned) len;
611 bs->wr_ops ++;
612 return 0;
614 return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
617 static int bdrv_pread_em(BlockDriverState *bs, int64_t offset,
618 uint8_t *buf, int count1)
620 uint8_t tmp_buf[SECTOR_SIZE];
621 int len, nb_sectors, count;
622 int64_t sector_num;
624 count = count1;
625 /* first read to align to sector start */
626 len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
627 if (len > count)
628 len = count;
629 sector_num = offset >> SECTOR_BITS;
630 if (len > 0) {
631 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
632 return -EIO;
633 memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len);
634 count -= len;
635 if (count == 0)
636 return count1;
637 sector_num++;
638 buf += len;
641 /* read the sectors "in place" */
642 nb_sectors = count >> SECTOR_BITS;
643 if (nb_sectors > 0) {
644 if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0)
645 return -EIO;
646 sector_num += nb_sectors;
647 len = nb_sectors << SECTOR_BITS;
648 buf += len;
649 count -= len;
652 /* add data from the last sector */
653 if (count > 0) {
654 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
655 return -EIO;
656 memcpy(buf, tmp_buf, count);
658 return count1;
661 static int bdrv_pwrite_em(BlockDriverState *bs, int64_t offset,
662 const uint8_t *buf, int count1)
664 uint8_t tmp_buf[SECTOR_SIZE];
665 int len, nb_sectors, count;
666 int64_t sector_num;
668 count = count1;
669 /* first write to align to sector start */
670 len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
671 if (len > count)
672 len = count;
673 sector_num = offset >> SECTOR_BITS;
674 if (len > 0) {
675 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
676 return -EIO;
677 memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len);
678 if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
679 return -EIO;
680 count -= len;
681 if (count == 0)
682 return count1;
683 sector_num++;
684 buf += len;
687 /* write the sectors "in place" */
688 nb_sectors = count >> SECTOR_BITS;
689 if (nb_sectors > 0) {
690 if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0)
691 return -EIO;
692 sector_num += nb_sectors;
693 len = nb_sectors << SECTOR_BITS;
694 buf += len;
695 count -= len;
698 /* add data from the last sector */
699 if (count > 0) {
700 if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
701 return -EIO;
702 memcpy(tmp_buf, buf, count);
703 if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
704 return -EIO;
706 return count1;
710 * Read with byte offsets (needed only for file protocols)
712 int bdrv_pread(BlockDriverState *bs, int64_t offset,
713 void *buf1, int count1)
715 BlockDriver *drv = bs->drv;
717 if (!drv)
718 return -ENOMEDIUM;
719 if (bdrv_check_byte_request(bs, offset, count1))
720 return -EIO;
722 if (!drv->bdrv_pread)
723 return bdrv_pread_em(bs, offset, buf1, count1);
724 return drv->bdrv_pread(bs, offset, buf1, count1);
728 * Write with byte offsets (needed only for file protocols)
730 int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
731 const void *buf1, int count1)
733 BlockDriver *drv = bs->drv;
735 if (!drv)
736 return -ENOMEDIUM;
737 if (bdrv_check_byte_request(bs, offset, count1))
738 return -EIO;
740 if (!drv->bdrv_pwrite)
741 return bdrv_pwrite_em(bs, offset, buf1, count1);
742 return drv->bdrv_pwrite(bs, offset, buf1, count1);
746 * Truncate file to 'offset' bytes (needed only for file protocols)
748 int bdrv_truncate(BlockDriverState *bs, int64_t offset)
750 BlockDriver *drv = bs->drv;
751 if (!drv)
752 return -ENOMEDIUM;
753 if (!drv->bdrv_truncate)
754 return -ENOTSUP;
755 return drv->bdrv_truncate(bs, offset);
759 * Length of a file in bytes. Return < 0 if error or unknown.
761 int64_t bdrv_getlength(BlockDriverState *bs)
763 BlockDriver *drv = bs->drv;
764 if (!drv)
765 return -ENOMEDIUM;
766 if (!drv->bdrv_getlength) {
767 /* legacy mode */
768 return bs->total_sectors * SECTOR_SIZE;
770 return drv->bdrv_getlength(bs);
773 /* return 0 as number of sectors if no device present or error */
774 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
776 int64_t length;
777 length = bdrv_getlength(bs);
778 if (length < 0)
779 length = 0;
780 else
781 length = length >> SECTOR_BITS;
782 *nb_sectors_ptr = length;
785 struct partition {
786 uint8_t boot_ind; /* 0x80 - active */
787 uint8_t head; /* starting head */
788 uint8_t sector; /* starting sector */
789 uint8_t cyl; /* starting cylinder */
790 uint8_t sys_ind; /* What partition type */
791 uint8_t end_head; /* end head */
792 uint8_t end_sector; /* end sector */
793 uint8_t end_cyl; /* end cylinder */
794 uint32_t start_sect; /* starting sector counting from 0 */
795 uint32_t nr_sects; /* nr of sectors in partition */
796 } __attribute__((packed));
798 /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
799 static int guess_disk_lchs(BlockDriverState *bs,
800 int *pcylinders, int *pheads, int *psectors)
802 uint8_t buf[512];
803 int ret, i, heads, sectors, cylinders;
804 struct partition *p;
805 uint32_t nr_sects;
806 uint64_t nb_sectors;
808 bdrv_get_geometry(bs, &nb_sectors);
810 ret = bdrv_read(bs, 0, buf, 1);
811 if (ret < 0)
812 return -1;
813 /* test msdos magic */
814 if (buf[510] != 0x55 || buf[511] != 0xaa)
815 return -1;
816 for(i = 0; i < 4; i++) {
817 p = ((struct partition *)(buf + 0x1be)) + i;
818 nr_sects = le32_to_cpu(p->nr_sects);
819 if (nr_sects && p->end_head) {
820 /* We make the assumption that the partition terminates on
821 a cylinder boundary */
822 heads = p->end_head + 1;
823 sectors = p->end_sector & 63;
824 if (sectors == 0)
825 continue;
826 cylinders = nb_sectors / (heads * sectors);
827 if (cylinders < 1 || cylinders > 16383)
828 continue;
829 *pheads = heads;
830 *psectors = sectors;
831 *pcylinders = cylinders;
832 #if 0
833 printf("guessed geometry: LCHS=%d %d %d\n",
834 cylinders, heads, sectors);
835 #endif
836 return 0;
839 return -1;
842 void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs)
844 int translation, lba_detected = 0;
845 int cylinders, heads, secs;
846 uint64_t nb_sectors;
848 /* if a geometry hint is available, use it */
849 bdrv_get_geometry(bs, &nb_sectors);
850 bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs);
851 translation = bdrv_get_translation_hint(bs);
852 if (cylinders != 0) {
853 *pcyls = cylinders;
854 *pheads = heads;
855 *psecs = secs;
856 } else {
857 if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) {
858 if (heads > 16) {
859 /* if heads > 16, it means that a BIOS LBA
860 translation was active, so the default
861 hardware geometry is OK */
862 lba_detected = 1;
863 goto default_geometry;
864 } else {
865 *pcyls = cylinders;
866 *pheads = heads;
867 *psecs = secs;
868 /* disable any translation to be in sync with
869 the logical geometry */
870 if (translation == BIOS_ATA_TRANSLATION_AUTO) {
871 bdrv_set_translation_hint(bs,
872 BIOS_ATA_TRANSLATION_NONE);
875 } else {
876 default_geometry:
877 /* if no geometry, use a standard physical disk geometry */
878 cylinders = nb_sectors / (16 * 63);
880 if (cylinders > 16383)
881 cylinders = 16383;
882 else if (cylinders < 2)
883 cylinders = 2;
884 *pcyls = cylinders;
885 *pheads = 16;
886 *psecs = 63;
887 if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) {
888 if ((*pcyls * *pheads) <= 131072) {
889 bdrv_set_translation_hint(bs,
890 BIOS_ATA_TRANSLATION_LARGE);
891 } else {
892 bdrv_set_translation_hint(bs,
893 BIOS_ATA_TRANSLATION_LBA);
897 bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs);
901 void bdrv_set_geometry_hint(BlockDriverState *bs,
902 int cyls, int heads, int secs)
904 bs->cyls = cyls;
905 bs->heads = heads;
906 bs->secs = secs;
909 void bdrv_set_type_hint(BlockDriverState *bs, int type)
911 bs->type = type;
912 bs->removable = ((type == BDRV_TYPE_CDROM ||
913 type == BDRV_TYPE_FLOPPY));
916 void bdrv_set_translation_hint(BlockDriverState *bs, int translation)
918 bs->translation = translation;
921 void bdrv_get_geometry_hint(BlockDriverState *bs,
922 int *pcyls, int *pheads, int *psecs)
924 *pcyls = bs->cyls;
925 *pheads = bs->heads;
926 *psecs = bs->secs;
929 int bdrv_get_type_hint(BlockDriverState *bs)
931 return bs->type;
934 int bdrv_get_translation_hint(BlockDriverState *bs)
936 return bs->translation;
939 int bdrv_is_removable(BlockDriverState *bs)
941 return bs->removable;
944 int bdrv_is_read_only(BlockDriverState *bs)
946 return bs->read_only;
949 int bdrv_is_sg(BlockDriverState *bs)
951 return bs->sg;
954 /* XXX: no longer used */
955 void bdrv_set_change_cb(BlockDriverState *bs,
956 void (*change_cb)(void *opaque), void *opaque)
958 bs->change_cb = change_cb;
959 bs->change_opaque = opaque;
962 int bdrv_is_encrypted(BlockDriverState *bs)
964 if (bs->backing_hd && bs->backing_hd->encrypted)
965 return 1;
966 return bs->encrypted;
969 int bdrv_set_key(BlockDriverState *bs, const char *key)
971 int ret;
972 if (bs->backing_hd && bs->backing_hd->encrypted) {
973 ret = bdrv_set_key(bs->backing_hd, key);
974 if (ret < 0)
975 return ret;
976 if (!bs->encrypted)
977 return 0;
979 if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key)
980 return -1;
981 return bs->drv->bdrv_set_key(bs, key);
984 void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size)
986 if (!bs->drv) {
987 buf[0] = '\0';
988 } else {
989 pstrcpy(buf, buf_size, bs->drv->format_name);
993 void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
994 void *opaque)
996 BlockDriver *drv;
998 for (drv = first_drv; drv != NULL; drv = drv->next) {
999 it(opaque, drv->format_name);
1003 BlockDriverState *bdrv_find(const char *name)
1005 BlockDriverState *bs;
1007 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
1008 if (!strcmp(name, bs->device_name))
1009 return bs;
1011 return NULL;
1014 void bdrv_iterate(void (*it)(void *opaque, const char *name), void *opaque)
1016 BlockDriverState *bs;
1018 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
1019 it(opaque, bs->device_name);
1023 const char *bdrv_get_device_name(BlockDriverState *bs)
1025 return bs->device_name;
1028 void bdrv_flush(BlockDriverState *bs)
1030 if (bs->drv->bdrv_flush)
1031 bs->drv->bdrv_flush(bs);
1032 if (bs->backing_hd)
1033 bdrv_flush(bs->backing_hd);
1036 void bdrv_flush_all(void)
1038 BlockDriverState *bs;
1040 for (bs = bdrv_first; bs != NULL; bs = bs->next)
1041 if (bs->drv && !bdrv_is_read_only(bs) &&
1042 (!bdrv_is_removable(bs) || bdrv_is_inserted(bs)))
1043 bdrv_flush(bs);
1047 * Returns true iff the specified sector is present in the disk image. Drivers
1048 * not implementing the functionality are assumed to not support backing files,
1049 * hence all their sectors are reported as allocated.
1051 * 'pnum' is set to the number of sectors (including and immediately following
1052 * the specified sector) that are known to be in the same
1053 * allocated/unallocated state.
1055 * 'nb_sectors' is the max value 'pnum' should be set to.
1057 int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
1058 int *pnum)
1060 int64_t n;
1061 if (!bs->drv->bdrv_is_allocated) {
1062 if (sector_num >= bs->total_sectors) {
1063 *pnum = 0;
1064 return 0;
1066 n = bs->total_sectors - sector_num;
1067 *pnum = (n < nb_sectors) ? (n) : (nb_sectors);
1068 return 1;
1070 return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
1073 void bdrv_info(void)
1075 BlockDriverState *bs;
1077 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
1078 term_printf("%s:", bs->device_name);
1079 term_printf(" type=");
1080 switch(bs->type) {
1081 case BDRV_TYPE_HD:
1082 term_printf("hd");
1083 break;
1084 case BDRV_TYPE_CDROM:
1085 term_printf("cdrom");
1086 break;
1087 case BDRV_TYPE_FLOPPY:
1088 term_printf("floppy");
1089 break;
1091 term_printf(" removable=%d", bs->removable);
1092 if (bs->removable) {
1093 term_printf(" locked=%d", bs->locked);
1095 if (bs->drv) {
1096 term_printf(" file=");
1097 term_print_filename(bs->filename);
1098 if (bs->backing_file[0] != '\0') {
1099 term_printf(" backing_file=");
1100 term_print_filename(bs->backing_file);
1102 term_printf(" ro=%d", bs->read_only);
1103 term_printf(" drv=%s", bs->drv->format_name);
1104 if (bs->encrypted)
1105 term_printf(" encrypted");
1106 } else {
1107 term_printf(" [not inserted]");
1109 term_printf("\n");
1113 /* The "info blockstats" command. */
1114 void bdrv_info_stats (void)
1116 BlockDriverState *bs;
1117 BlockDriverInfo bdi;
1119 for (bs = bdrv_first; bs != NULL; bs = bs->next) {
1120 term_printf ("%s:"
1121 " rd_bytes=%" PRIu64
1122 " wr_bytes=%" PRIu64
1123 " rd_operations=%" PRIu64
1124 " wr_operations=%" PRIu64
1126 bs->device_name,
1127 bs->rd_bytes, bs->wr_bytes,
1128 bs->rd_ops, bs->wr_ops);
1129 if (bdrv_get_info(bs, &bdi) == 0)
1130 term_printf(" high=%" PRId64
1131 " bytes_free=%" PRId64,
1132 bdi.highest_alloc, bdi.num_free_bytes);
1133 term_printf("\n");
1137 void bdrv_get_backing_filename(BlockDriverState *bs,
1138 char *filename, int filename_size)
1140 if (!bs->backing_hd) {
1141 pstrcpy(filename, filename_size, "");
1142 } else {
1143 pstrcpy(filename, filename_size, bs->backing_file);
1147 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
1148 const uint8_t *buf, int nb_sectors)
1150 BlockDriver *drv = bs->drv;
1151 if (!drv)
1152 return -ENOMEDIUM;
1153 if (!drv->bdrv_write_compressed)
1154 return -ENOTSUP;
1155 return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
1158 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
1160 BlockDriver *drv = bs->drv;
1161 if (!drv)
1162 return -ENOMEDIUM;
1163 if (!drv->bdrv_get_info)
1164 return -ENOTSUP;
1165 memset(bdi, 0, sizeof(*bdi));
1166 return drv->bdrv_get_info(bs, bdi);
1169 /**************************************************************/
1170 /* handling of snapshots */
1172 int bdrv_snapshot_create(BlockDriverState *bs,
1173 QEMUSnapshotInfo *sn_info)
1175 BlockDriver *drv = bs->drv;
1176 if (!drv)
1177 return -ENOMEDIUM;
1178 if (!drv->bdrv_snapshot_create)
1179 return -ENOTSUP;
1180 return drv->bdrv_snapshot_create(bs, sn_info);
1183 int bdrv_snapshot_goto(BlockDriverState *bs,
1184 const char *snapshot_id)
1186 BlockDriver *drv = bs->drv;
1187 if (!drv)
1188 return -ENOMEDIUM;
1189 if (!drv->bdrv_snapshot_goto)
1190 return -ENOTSUP;
1191 return drv->bdrv_snapshot_goto(bs, snapshot_id);
1194 int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
1196 BlockDriver *drv = bs->drv;
1197 if (!drv)
1198 return -ENOMEDIUM;
1199 if (!drv->bdrv_snapshot_delete)
1200 return -ENOTSUP;
1201 return drv->bdrv_snapshot_delete(bs, snapshot_id);
1204 int bdrv_snapshot_list(BlockDriverState *bs,
1205 QEMUSnapshotInfo **psn_info)
1207 BlockDriver *drv = bs->drv;
1208 if (!drv)
1209 return -ENOMEDIUM;
1210 if (!drv->bdrv_snapshot_list)
1211 return -ENOTSUP;
1212 return drv->bdrv_snapshot_list(bs, psn_info);
1215 #define NB_SUFFIXES 4
1217 char *get_human_readable_size(char *buf, int buf_size, int64_t size)
1219 static const char suffixes[NB_SUFFIXES] = "KMGT";
1220 int64_t base;
1221 int i;
1223 if (size <= 999) {
1224 snprintf(buf, buf_size, "%" PRId64, size);
1225 } else {
1226 base = 1024;
1227 for(i = 0; i < NB_SUFFIXES; i++) {
1228 if (size < (10 * base)) {
1229 snprintf(buf, buf_size, "%0.1f%c",
1230 (double)size / base,
1231 suffixes[i]);
1232 break;
1233 } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) {
1234 snprintf(buf, buf_size, "%" PRId64 "%c",
1235 ((size + (base >> 1)) / base),
1236 suffixes[i]);
1237 break;
1239 base = base * 1024;
1242 return buf;
1245 char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn)
1247 char buf1[128], date_buf[128], clock_buf[128];
1248 #ifdef _WIN32
1249 struct tm *ptm;
1250 #else
1251 struct tm tm;
1252 #endif
1253 time_t ti;
1254 int64_t secs;
1256 if (!sn) {
1257 snprintf(buf, buf_size,
1258 "%-10s%-20s%7s%20s%15s",
1259 "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
1260 } else {
1261 ti = sn->date_sec;
1262 #ifdef _WIN32
1263 ptm = localtime(&ti);
1264 strftime(date_buf, sizeof(date_buf),
1265 "%Y-%m-%d %H:%M:%S", ptm);
1266 #else
1267 localtime_r(&ti, &tm);
1268 strftime(date_buf, sizeof(date_buf),
1269 "%Y-%m-%d %H:%M:%S", &tm);
1270 #endif
1271 secs = sn->vm_clock_nsec / 1000000000;
1272 snprintf(clock_buf, sizeof(clock_buf),
1273 "%02d:%02d:%02d.%03d",
1274 (int)(secs / 3600),
1275 (int)((secs / 60) % 60),
1276 (int)(secs % 60),
1277 (int)((sn->vm_clock_nsec / 1000000) % 1000));
1278 snprintf(buf, buf_size,
1279 "%-10s%-20s%7s%20s%15s",
1280 sn->id_str, sn->name,
1281 get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
1282 date_buf,
1283 clock_buf);
1285 return buf;
1289 /**************************************************************/
1290 /* async I/Os */
1292 typedef struct VectorTranslationState {
1293 QEMUIOVector *iov;
1294 uint8_t *bounce;
1295 int is_write;
1296 BlockDriverAIOCB *aiocb;
1297 BlockDriverAIOCB *this_aiocb;
1298 } VectorTranslationState;
1300 static void bdrv_aio_rw_vector_cb(void *opaque, int ret)
1302 VectorTranslationState *s = opaque;
1304 if (!s->is_write) {
1305 qemu_iovec_from_buffer(s->iov, s->bounce, s->iov->size);
1307 qemu_vfree(s->bounce);
1308 s->this_aiocb->cb(s->this_aiocb->opaque, ret);
1309 qemu_aio_release(s->this_aiocb);
1312 static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
1313 int64_t sector_num,
1314 QEMUIOVector *iov,
1315 int nb_sectors,
1316 BlockDriverCompletionFunc *cb,
1317 void *opaque,
1318 int is_write)
1321 VectorTranslationState *s = qemu_mallocz(sizeof(*s));
1322 BlockDriverAIOCB *aiocb = qemu_aio_get(bs, cb, opaque);
1324 s->this_aiocb = aiocb;
1325 s->iov = iov;
1326 s->bounce = qemu_memalign(512, nb_sectors * 512);
1327 s->is_write = is_write;
1328 if (is_write) {
1329 qemu_iovec_to_buffer(s->iov, s->bounce);
1330 s->aiocb = bdrv_aio_write(bs, sector_num, s->bounce, nb_sectors,
1331 bdrv_aio_rw_vector_cb, s);
1332 } else {
1333 s->aiocb = bdrv_aio_read(bs, sector_num, s->bounce, nb_sectors,
1334 bdrv_aio_rw_vector_cb, s);
1336 return aiocb;
1339 BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
1340 QEMUIOVector *iov, int nb_sectors,
1341 BlockDriverCompletionFunc *cb, void *opaque)
1343 if (bdrv_check_request(bs, sector_num, nb_sectors))
1344 return NULL;
1346 return bdrv_aio_rw_vector(bs, sector_num, iov, nb_sectors,
1347 cb, opaque, 0);
1350 BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
1351 QEMUIOVector *iov, int nb_sectors,
1352 BlockDriverCompletionFunc *cb, void *opaque)
1354 if (bdrv_check_request(bs, sector_num, nb_sectors))
1355 return NULL;
1357 return bdrv_aio_rw_vector(bs, sector_num, iov, nb_sectors,
1358 cb, opaque, 1);
1361 BlockDriverAIOCB *bdrv_aio_read(BlockDriverState *bs, int64_t sector_num,
1362 uint8_t *buf, int nb_sectors,
1363 BlockDriverCompletionFunc *cb, void *opaque)
1365 BlockDriver *drv = bs->drv;
1366 BlockDriverAIOCB *ret;
1368 if (!drv)
1369 return NULL;
1370 if (bdrv_check_request(bs, sector_num, nb_sectors))
1371 return NULL;
1373 ret = drv->bdrv_aio_read(bs, sector_num, buf, nb_sectors, cb, opaque);
1375 if (ret) {
1376 /* Update stats even though technically transfer has not happened. */
1377 bs->rd_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
1378 bs->rd_ops ++;
1381 return ret;
1384 BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num,
1385 const uint8_t *buf, int nb_sectors,
1386 BlockDriverCompletionFunc *cb, void *opaque)
1388 BlockDriver *drv = bs->drv;
1389 BlockDriverAIOCB *ret;
1391 if (!drv)
1392 return NULL;
1393 if (bs->read_only)
1394 return NULL;
1395 if (bdrv_check_request(bs, sector_num, nb_sectors))
1396 return NULL;
1398 ret = drv->bdrv_aio_write(bs, sector_num, buf, nb_sectors, cb, opaque);
1400 if (ret) {
1401 /* Update stats even though technically transfer has not happened. */
1402 bs->wr_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
1403 bs->wr_ops ++;
1406 return ret;
1409 void bdrv_aio_cancel(BlockDriverAIOCB *acb)
1411 BlockDriver *drv = acb->bs->drv;
1413 if (acb->cb == bdrv_aio_rw_vector_cb) {
1414 VectorTranslationState *s = acb->opaque;
1415 acb = s->aiocb;
1418 drv->bdrv_aio_cancel(acb);
1422 /**************************************************************/
1423 /* async block device emulation */
1425 static void bdrv_aio_bh_cb(void *opaque)
1427 BlockDriverAIOCBSync *acb = opaque;
1428 acb->common.cb(acb->common.opaque, acb->ret);
1429 qemu_aio_release(acb);
1432 static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
1433 int64_t sector_num, uint8_t *buf, int nb_sectors,
1434 BlockDriverCompletionFunc *cb, void *opaque)
1436 BlockDriverAIOCBSync *acb;
1437 int ret;
1439 acb = qemu_aio_get(bs, cb, opaque);
1440 if (!acb->bh)
1441 acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
1442 ret = bdrv_read(bs, sector_num, buf, nb_sectors);
1443 acb->ret = ret;
1444 qemu_bh_schedule(acb->bh);
1445 return &acb->common;
1448 static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
1449 int64_t sector_num, const uint8_t *buf, int nb_sectors,
1450 BlockDriverCompletionFunc *cb, void *opaque)
1452 BlockDriverAIOCBSync *acb;
1453 int ret;
1455 acb = qemu_aio_get(bs, cb, opaque);
1456 if (!acb->bh)
1457 acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
1458 ret = bdrv_write(bs, sector_num, buf, nb_sectors);
1459 acb->ret = ret;
1460 qemu_bh_schedule(acb->bh);
1461 return &acb->common;
1464 static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb)
1466 BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb;
1467 qemu_bh_cancel(acb->bh);
1468 qemu_aio_release(acb);
1471 /**************************************************************/
1472 /* sync block device emulation */
1474 static void bdrv_rw_em_cb(void *opaque, int ret)
1476 *(int *)opaque = ret;
1479 #define NOT_DONE 0x7fffffff
1481 static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
1482 uint8_t *buf, int nb_sectors)
1484 int async_ret;
1485 BlockDriverAIOCB *acb;
1487 async_ret = NOT_DONE;
1488 acb = bdrv_aio_read(bs, sector_num, buf, nb_sectors,
1489 bdrv_rw_em_cb, &async_ret);
1490 if (acb == NULL)
1491 return -1;
1493 while (async_ret == NOT_DONE) {
1494 qemu_aio_wait();
1497 return async_ret;
1500 static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
1501 const uint8_t *buf, int nb_sectors)
1503 int async_ret;
1504 BlockDriverAIOCB *acb;
1506 async_ret = NOT_DONE;
1507 acb = bdrv_aio_write(bs, sector_num, buf, nb_sectors,
1508 bdrv_rw_em_cb, &async_ret);
1509 if (acb == NULL)
1510 return -1;
1511 while (async_ret == NOT_DONE) {
1512 qemu_aio_wait();
1514 return async_ret;
1517 void bdrv_init(void)
1519 bdrv_register(&bdrv_raw);
1520 bdrv_register(&bdrv_host_device);
1521 #ifndef _WIN32
1522 bdrv_register(&bdrv_cow);
1523 #endif
1524 bdrv_register(&bdrv_qcow);
1525 bdrv_register(&bdrv_vmdk);
1526 bdrv_register(&bdrv_cloop);
1527 bdrv_register(&bdrv_dmg);
1528 bdrv_register(&bdrv_bochs);
1529 bdrv_register(&bdrv_vpc);
1530 bdrv_register(&bdrv_vvfat);
1531 bdrv_register(&bdrv_qcow2);
1532 bdrv_register(&bdrv_parallels);
1533 bdrv_register(&bdrv_nbd);
1536 void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb,
1537 void *opaque)
1539 BlockDriver *drv;
1540 BlockDriverAIOCB *acb;
1542 drv = bs->drv;
1543 if (drv->free_aiocb) {
1544 acb = drv->free_aiocb;
1545 drv->free_aiocb = acb->next;
1546 } else {
1547 acb = qemu_mallocz(drv->aiocb_size);
1549 acb->bs = bs;
1550 acb->cb = cb;
1551 acb->opaque = opaque;
1552 return acb;
1555 void qemu_aio_release(void *p)
1557 BlockDriverAIOCB *acb = p;
1558 BlockDriver *drv = acb->bs->drv;
1559 acb->next = drv->free_aiocb;
1560 drv->free_aiocb = acb;
1563 /**************************************************************/
1564 /* removable device support */
1567 * Return TRUE if the media is present
1569 int bdrv_is_inserted(BlockDriverState *bs)
1571 BlockDriver *drv = bs->drv;
1572 int ret;
1573 if (!drv)
1574 return 0;
1575 if (!drv->bdrv_is_inserted)
1576 return 1;
1577 ret = drv->bdrv_is_inserted(bs);
1578 return ret;
1582 * Return TRUE if the media changed since the last call to this
1583 * function. It is currently only used for floppy disks
1585 int bdrv_media_changed(BlockDriverState *bs)
1587 BlockDriver *drv = bs->drv;
1588 int ret;
1590 if (!drv || !drv->bdrv_media_changed)
1591 ret = -ENOTSUP;
1592 else
1593 ret = drv->bdrv_media_changed(bs);
1594 if (ret == -ENOTSUP)
1595 ret = bs->media_changed;
1596 bs->media_changed = 0;
1597 return ret;
1601 * If eject_flag is TRUE, eject the media. Otherwise, close the tray
1603 void bdrv_eject(BlockDriverState *bs, int eject_flag)
1605 BlockDriver *drv = bs->drv;
1606 int ret;
1608 if (!drv || !drv->bdrv_eject) {
1609 ret = -ENOTSUP;
1610 } else {
1611 ret = drv->bdrv_eject(bs, eject_flag);
1613 if (ret == -ENOTSUP) {
1614 if (eject_flag)
1615 bdrv_close(bs);
1619 int bdrv_is_locked(BlockDriverState *bs)
1621 return bs->locked;
1625 * Lock or unlock the media (if it is locked, the user won't be able
1626 * to eject it manually).
1628 void bdrv_set_locked(BlockDriverState *bs, int locked)
1630 BlockDriver *drv = bs->drv;
1632 bs->locked = locked;
1633 if (drv && drv->bdrv_set_locked) {
1634 drv->bdrv_set_locked(bs, locked);
1638 /* needed for generic scsi interface */
1640 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
1642 BlockDriver *drv = bs->drv;
1644 if (drv && drv->bdrv_ioctl)
1645 return drv->bdrv_ioctl(bs, req, buf);
1646 return -ENOTSUP;