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| 1 |
/*
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|---|---|
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* QEMU System Emulator block driver
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "config-host.h" |
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#ifdef HOST_BSD
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/* include native header before sys-queue.h */
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#include <sys/queue.h> |
| 28 |
#endif
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|
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#include "qemu-common.h" |
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#include "monitor.h" |
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#include "block_int.h" |
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|
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#ifdef HOST_BSD
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#include <sys/types.h> |
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#include <sys/stat.h> |
| 37 |
#include <sys/ioctl.h> |
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#ifndef __DragonFly__
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#include <sys/disk.h> |
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#endif
|
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#endif
|
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|
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#ifdef _WIN32
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#include <windows.h> |
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#endif
|
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|
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#define SECTOR_BITS 9 |
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#define SECTOR_SIZE (1 << SECTOR_BITS) |
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|
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typedef struct BlockDriverAIOCBSync { |
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BlockDriverAIOCB common; |
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QEMUBH *bh; |
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int ret;
|
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/* vector translation state */
|
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QEMUIOVector *qiov; |
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uint8_t *bounce; |
| 57 |
int is_write;
|
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} BlockDriverAIOCBSync; |
| 59 |
|
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static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
|
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int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
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BlockDriverCompletionFunc *cb, void *opaque);
|
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static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
|
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int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
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BlockDriverCompletionFunc *cb, void *opaque);
|
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static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb); |
| 67 |
static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
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uint8_t *buf, int nb_sectors);
|
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static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
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const uint8_t *buf, int nb_sectors); |
| 71 |
|
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BlockDriverState *bdrv_first; |
| 73 |
|
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static BlockDriver *first_drv;
|
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|
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int path_is_absolute(const char *path) |
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{
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const char *p; |
| 79 |
#ifdef _WIN32
|
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/* specific case for names like: "\\.\d:" */
|
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if (*path == '/' || *path == '\\') |
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return 1; |
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#endif
|
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p = strchr(path, ':');
|
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if (p)
|
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p++; |
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else
|
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p = path; |
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#ifdef _WIN32
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return (*p == '/' || *p == '\\'); |
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#else
|
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return (*p == '/'); |
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#endif
|
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} |
| 95 |
|
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/* if filename is absolute, just copy it to dest. Otherwise, build a
|
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path to it by considering it is relative to base_path. URL are
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supported. */
|
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void path_combine(char *dest, int dest_size, |
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const char *base_path, |
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const char *filename) |
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{
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const char *p, *p1; |
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int len;
|
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|
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if (dest_size <= 0) |
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return;
|
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if (path_is_absolute(filename)) {
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pstrcpy(dest, dest_size, filename); |
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} else {
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p = strchr(base_path, ':');
|
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if (p)
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p++; |
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else
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p = base_path; |
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p1 = strrchr(base_path, '/');
|
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#ifdef _WIN32
|
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{
|
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const char *p2; |
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p2 = strrchr(base_path, '\\');
|
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if (!p1 || p2 > p1)
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p1 = p2; |
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} |
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#endif
|
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if (p1)
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p1++; |
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else
|
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p1 = base_path; |
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if (p1 > p)
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p = p1; |
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len = p - base_path; |
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if (len > dest_size - 1) |
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len = dest_size - 1;
|
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memcpy(dest, base_path, len); |
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dest[len] = '\0';
|
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pstrcat(dest, dest_size, filename); |
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} |
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} |
| 139 |
|
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|
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static void bdrv_register(BlockDriver *bdrv) |
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{
|
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if (!bdrv->bdrv_aio_readv) {
|
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/* add AIO emulation layer */
|
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bdrv->bdrv_aio_readv = bdrv_aio_readv_em; |
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bdrv->bdrv_aio_writev = bdrv_aio_writev_em; |
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bdrv->bdrv_aio_cancel = bdrv_aio_cancel_em; |
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bdrv->aiocb_size = sizeof(BlockDriverAIOCBSync);
|
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} else if (!bdrv->bdrv_read) { |
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/* add synchronous IO emulation layer */
|
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bdrv->bdrv_read = bdrv_read_em; |
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bdrv->bdrv_write = bdrv_write_em; |
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} |
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aio_pool_init(&bdrv->aio_pool, bdrv->aiocb_size, bdrv->bdrv_aio_cancel); |
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bdrv->next = first_drv; |
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first_drv = bdrv; |
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} |
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|
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/* create a new block device (by default it is empty) */
|
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BlockDriverState *bdrv_new(const char *device_name) |
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{
|
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BlockDriverState **pbs, *bs; |
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|
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bs = qemu_mallocz(sizeof(BlockDriverState));
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pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
|
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if (device_name[0] != '\0') { |
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/* insert at the end */
|
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pbs = &bdrv_first; |
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while (*pbs != NULL) |
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pbs = &(*pbs)->next; |
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*pbs = bs; |
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} |
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return bs;
|
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} |
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|
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BlockDriver *bdrv_find_format(const char *format_name) |
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{
|
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BlockDriver *drv1; |
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for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
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if (!strcmp(drv1->format_name, format_name))
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return drv1;
|
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} |
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return NULL; |
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} |
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|
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int bdrv_create2(BlockDriver *drv,
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const char *filename, int64_t size_in_sectors, |
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const char *backing_file, const char *backing_format, |
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int flags)
|
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{
|
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if (drv->bdrv_create2)
|
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return drv->bdrv_create2(filename, size_in_sectors, backing_file,
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backing_format, flags); |
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if (drv->bdrv_create)
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return drv->bdrv_create(filename, size_in_sectors, backing_file,
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flags); |
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return -ENOTSUP;
|
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} |
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|
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int bdrv_create(BlockDriver *drv,
|
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const char *filename, int64_t size_in_sectors, |
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const char *backing_file, int flags) |
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{
|
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if (!drv->bdrv_create)
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return -ENOTSUP;
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return drv->bdrv_create(filename, size_in_sectors, backing_file, flags);
|
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} |
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|
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#ifdef _WIN32
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void get_tmp_filename(char *filename, int size) |
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{
|
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char temp_dir[MAX_PATH];
|
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|
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GetTempPath(MAX_PATH, temp_dir); |
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GetTempFileName(temp_dir, "qem", 0, filename); |
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} |
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#else
|
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void get_tmp_filename(char *filename, int size) |
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{
|
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int fd;
|
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const char *tmpdir; |
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/* XXX: race condition possible */
|
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tmpdir = getenv("TMPDIR");
|
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if (!tmpdir)
|
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tmpdir = "/tmp";
|
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snprintf(filename, size, "%s/vl.XXXXXX", tmpdir);
|
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fd = mkstemp(filename); |
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close(fd); |
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} |
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#endif
|
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|
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#ifdef _WIN32
|
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static int is_windows_drive_prefix(const char *filename) |
| 234 |
{
|
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return (((filename[0] >= 'a' && filename[0] <= 'z') || |
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(filename[0] >= 'A' && filename[0] <= 'Z')) && |
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filename[1] == ':'); |
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} |
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|
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static int is_windows_drive(const char *filename) |
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{
|
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if (is_windows_drive_prefix(filename) &&
|
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filename[2] == '\0') |
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return 1; |
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if (strstart(filename, "\\\\.\\", NULL) || |
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strstart(filename, "//./", NULL)) |
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return 1; |
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return 0; |
| 249 |
} |
| 250 |
#endif
|
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|
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static BlockDriver *find_protocol(const char *filename) |
| 253 |
{
|
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BlockDriver *drv1; |
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char protocol[128]; |
| 256 |
int len;
|
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const char *p; |
| 258 |
|
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#ifdef _WIN32
|
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if (is_windows_drive(filename) ||
|
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is_windows_drive_prefix(filename)) |
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return &bdrv_raw;
|
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#endif
|
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p = strchr(filename, ':');
|
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if (!p)
|
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return &bdrv_raw;
|
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len = p - filename; |
| 268 |
if (len > sizeof(protocol) - 1) |
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len = sizeof(protocol) - 1; |
| 270 |
memcpy(protocol, filename, len); |
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protocol[len] = '\0';
|
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for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
| 273 |
if (drv1->protocol_name &&
|
| 274 |
!strcmp(drv1->protocol_name, protocol)) |
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return drv1;
|
| 276 |
} |
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return NULL; |
| 278 |
} |
| 279 |
|
| 280 |
/* XXX: force raw format if block or character device ? It would
|
| 281 |
simplify the BSD case */
|
| 282 |
static BlockDriver *find_image_format(const char *filename) |
| 283 |
{
|
| 284 |
int ret, score, score_max;
|
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BlockDriver *drv1, *drv; |
| 286 |
uint8_t buf[2048];
|
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BlockDriverState *bs; |
| 288 |
|
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/* detect host devices. By convention, /dev/cdrom[N] is always
|
| 290 |
recognized as a host CDROM */
|
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if (strstart(filename, "/dev/cdrom", NULL)) |
| 292 |
return &bdrv_host_device;
|
| 293 |
#ifdef _WIN32
|
| 294 |
if (is_windows_drive(filename))
|
| 295 |
return &bdrv_host_device;
|
| 296 |
#else
|
| 297 |
{
|
| 298 |
struct stat st;
|
| 299 |
if (stat(filename, &st) >= 0 && |
| 300 |
(S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
|
| 301 |
return &bdrv_host_device;
|
| 302 |
} |
| 303 |
} |
| 304 |
#endif
|
| 305 |
|
| 306 |
drv = find_protocol(filename); |
| 307 |
/* no need to test disk image formats for vvfat */
|
| 308 |
if (drv == &bdrv_vvfat)
|
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return drv;
|
| 310 |
|
| 311 |
ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY); |
| 312 |
if (ret < 0) |
| 313 |
return NULL; |
| 314 |
ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
| 315 |
bdrv_delete(bs); |
| 316 |
if (ret < 0) { |
| 317 |
return NULL; |
| 318 |
} |
| 319 |
|
| 320 |
score_max = 0;
|
| 321 |
for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
| 322 |
if (drv1->bdrv_probe) {
|
| 323 |
score = drv1->bdrv_probe(buf, ret, filename); |
| 324 |
if (score > score_max) {
|
| 325 |
score_max = score; |
| 326 |
drv = drv1; |
| 327 |
} |
| 328 |
} |
| 329 |
} |
| 330 |
return drv;
|
| 331 |
} |
| 332 |
|
| 333 |
int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
| 334 |
{
|
| 335 |
BlockDriverState *bs; |
| 336 |
int ret;
|
| 337 |
|
| 338 |
bs = bdrv_new("");
|
| 339 |
ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL);
|
| 340 |
if (ret < 0) { |
| 341 |
bdrv_delete(bs); |
| 342 |
return ret;
|
| 343 |
} |
| 344 |
bs->growable = 1;
|
| 345 |
*pbs = bs; |
| 346 |
return 0; |
| 347 |
} |
| 348 |
|
| 349 |
int bdrv_open(BlockDriverState *bs, const char *filename, int flags) |
| 350 |
{
|
| 351 |
return bdrv_open2(bs, filename, flags, NULL); |
| 352 |
} |
| 353 |
|
| 354 |
int bdrv_open2(BlockDriverState *bs, const char *filename, int flags, |
| 355 |
BlockDriver *drv) |
| 356 |
{
|
| 357 |
int ret, open_flags;
|
| 358 |
char tmp_filename[PATH_MAX];
|
| 359 |
char backing_filename[PATH_MAX];
|
| 360 |
|
| 361 |
bs->read_only = 0;
|
| 362 |
bs->is_temporary = 0;
|
| 363 |
bs->encrypted = 0;
|
| 364 |
bs->valid_key = 0;
|
| 365 |
/* buffer_alignment defaulted to 512, drivers can change this value */
|
| 366 |
bs->buffer_alignment = 512;
|
| 367 |
|
| 368 |
if (flags & BDRV_O_SNAPSHOT) {
|
| 369 |
BlockDriverState *bs1; |
| 370 |
int64_t total_size; |
| 371 |
int is_protocol = 0; |
| 372 |
|
| 373 |
/* if snapshot, we create a temporary backing file and open it
|
| 374 |
instead of opening 'filename' directly */
|
| 375 |
|
| 376 |
/* if there is a backing file, use it */
|
| 377 |
bs1 = bdrv_new("");
|
| 378 |
ret = bdrv_open2(bs1, filename, 0, drv);
|
| 379 |
if (ret < 0) { |
| 380 |
bdrv_delete(bs1); |
| 381 |
return ret;
|
| 382 |
} |
| 383 |
total_size = bdrv_getlength(bs1) >> SECTOR_BITS; |
| 384 |
|
| 385 |
if (bs1->drv && bs1->drv->protocol_name)
|
| 386 |
is_protocol = 1;
|
| 387 |
|
| 388 |
bdrv_delete(bs1); |
| 389 |
|
| 390 |
get_tmp_filename(tmp_filename, sizeof(tmp_filename));
|
| 391 |
|
| 392 |
/* Real path is meaningless for protocols */
|
| 393 |
if (is_protocol)
|
| 394 |
snprintf(backing_filename, sizeof(backing_filename),
|
| 395 |
"%s", filename);
|
| 396 |
else
|
| 397 |
realpath(filename, backing_filename); |
| 398 |
|
| 399 |
ret = bdrv_create2(&bdrv_qcow2, tmp_filename, |
| 400 |
total_size, backing_filename, |
| 401 |
(drv ? drv->format_name : NULL), 0); |
| 402 |
if (ret < 0) { |
| 403 |
return ret;
|
| 404 |
} |
| 405 |
filename = tmp_filename; |
| 406 |
drv = &bdrv_qcow2; |
| 407 |
bs->is_temporary = 1;
|
| 408 |
} |
| 409 |
|
| 410 |
pstrcpy(bs->filename, sizeof(bs->filename), filename);
|
| 411 |
if (flags & BDRV_O_FILE) {
|
| 412 |
drv = find_protocol(filename); |
| 413 |
} else if (!drv) { |
| 414 |
drv = find_image_format(filename); |
| 415 |
} |
| 416 |
if (!drv) {
|
| 417 |
ret = -ENOENT; |
| 418 |
goto unlink_and_fail;
|
| 419 |
} |
| 420 |
bs->drv = drv; |
| 421 |
bs->opaque = qemu_mallocz(drv->instance_size); |
| 422 |
/* Note: for compatibility, we open disk image files as RDWR, and
|
| 423 |
RDONLY as fallback */
|
| 424 |
if (!(flags & BDRV_O_FILE))
|
| 425 |
open_flags = BDRV_O_RDWR | (flags & BDRV_O_CACHE_MASK); |
| 426 |
else
|
| 427 |
open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT); |
| 428 |
ret = drv->bdrv_open(bs, filename, open_flags); |
| 429 |
if ((ret == -EACCES || ret == -EPERM) && !(flags & BDRV_O_FILE)) {
|
| 430 |
ret = drv->bdrv_open(bs, filename, open_flags & ~BDRV_O_RDWR); |
| 431 |
bs->read_only = 1;
|
| 432 |
} |
| 433 |
if (ret < 0) { |
| 434 |
qemu_free(bs->opaque); |
| 435 |
bs->opaque = NULL;
|
| 436 |
bs->drv = NULL;
|
| 437 |
unlink_and_fail:
|
| 438 |
if (bs->is_temporary)
|
| 439 |
unlink(filename); |
| 440 |
return ret;
|
| 441 |
} |
| 442 |
if (drv->bdrv_getlength) {
|
| 443 |
bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
| 444 |
} |
| 445 |
#ifndef _WIN32
|
| 446 |
if (bs->is_temporary) {
|
| 447 |
unlink(filename); |
| 448 |
} |
| 449 |
#endif
|
| 450 |
if (bs->backing_file[0] != '\0') { |
| 451 |
/* if there is a backing file, use it */
|
| 452 |
BlockDriver *back_drv = NULL;
|
| 453 |
bs->backing_hd = bdrv_new("");
|
| 454 |
path_combine(backing_filename, sizeof(backing_filename),
|
| 455 |
filename, bs->backing_file); |
| 456 |
if (bs->backing_format[0] != '\0') |
| 457 |
back_drv = bdrv_find_format(bs->backing_format); |
| 458 |
ret = bdrv_open2(bs->backing_hd, backing_filename, open_flags, |
| 459 |
back_drv); |
| 460 |
if (ret < 0) { |
| 461 |
bdrv_close(bs); |
| 462 |
return ret;
|
| 463 |
} |
| 464 |
} |
| 465 |
|
| 466 |
if (!bdrv_key_required(bs)) {
|
| 467 |
/* call the change callback */
|
| 468 |
bs->media_changed = 1;
|
| 469 |
if (bs->change_cb)
|
| 470 |
bs->change_cb(bs->change_opaque); |
| 471 |
} |
| 472 |
return 0; |
| 473 |
} |
| 474 |
|
| 475 |
void bdrv_close(BlockDriverState *bs)
|
| 476 |
{
|
| 477 |
if (bs->drv) {
|
| 478 |
if (bs->backing_hd)
|
| 479 |
bdrv_delete(bs->backing_hd); |
| 480 |
bs->drv->bdrv_close(bs); |
| 481 |
qemu_free(bs->opaque); |
| 482 |
#ifdef _WIN32
|
| 483 |
if (bs->is_temporary) {
|
| 484 |
unlink(bs->filename); |
| 485 |
} |
| 486 |
#endif
|
| 487 |
bs->opaque = NULL;
|
| 488 |
bs->drv = NULL;
|
| 489 |
|
| 490 |
/* call the change callback */
|
| 491 |
bs->media_changed = 1;
|
| 492 |
if (bs->change_cb)
|
| 493 |
bs->change_cb(bs->change_opaque); |
| 494 |
} |
| 495 |
} |
| 496 |
|
| 497 |
void bdrv_delete(BlockDriverState *bs)
|
| 498 |
{
|
| 499 |
BlockDriverState **pbs; |
| 500 |
|
| 501 |
pbs = &bdrv_first; |
| 502 |
while (*pbs != bs && *pbs != NULL) |
| 503 |
pbs = &(*pbs)->next; |
| 504 |
if (*pbs == bs)
|
| 505 |
*pbs = bs->next; |
| 506 |
|
| 507 |
bdrv_close(bs); |
| 508 |
qemu_free(bs); |
| 509 |
} |
| 510 |
|
| 511 |
/*
|
| 512 |
* Run consistency checks on an image
|
| 513 |
*
|
| 514 |
* Returns the number of errors or -errno when an internal error occurs
|
| 515 |
*/
|
| 516 |
int bdrv_check(BlockDriverState *bs)
|
| 517 |
{
|
| 518 |
if (bs->drv->bdrv_check == NULL) { |
| 519 |
return -ENOTSUP;
|
| 520 |
} |
| 521 |
|
| 522 |
return bs->drv->bdrv_check(bs);
|
| 523 |
} |
| 524 |
|
| 525 |
/* commit COW file into the raw image */
|
| 526 |
int bdrv_commit(BlockDriverState *bs)
|
| 527 |
{
|
| 528 |
BlockDriver *drv = bs->drv; |
| 529 |
int64_t i, total_sectors; |
| 530 |
int n, j;
|
| 531 |
unsigned char sector[512]; |
| 532 |
|
| 533 |
if (!drv)
|
| 534 |
return -ENOMEDIUM;
|
| 535 |
|
| 536 |
if (bs->read_only) {
|
| 537 |
return -EACCES;
|
| 538 |
} |
| 539 |
|
| 540 |
if (!bs->backing_hd) {
|
| 541 |
return -ENOTSUP;
|
| 542 |
} |
| 543 |
|
| 544 |
total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
| 545 |
for (i = 0; i < total_sectors;) { |
| 546 |
if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { |
| 547 |
for(j = 0; j < n; j++) { |
| 548 |
if (bdrv_read(bs, i, sector, 1) != 0) { |
| 549 |
return -EIO;
|
| 550 |
} |
| 551 |
|
| 552 |
if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { |
| 553 |
return -EIO;
|
| 554 |
} |
| 555 |
i++; |
| 556 |
} |
| 557 |
} else {
|
| 558 |
i += n; |
| 559 |
} |
| 560 |
} |
| 561 |
|
| 562 |
if (drv->bdrv_make_empty)
|
| 563 |
return drv->bdrv_make_empty(bs);
|
| 564 |
|
| 565 |
return 0; |
| 566 |
} |
| 567 |
|
| 568 |
static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
| 569 |
size_t size) |
| 570 |
{
|
| 571 |
int64_t len; |
| 572 |
|
| 573 |
if (!bdrv_is_inserted(bs))
|
| 574 |
return -ENOMEDIUM;
|
| 575 |
|
| 576 |
if (bs->growable)
|
| 577 |
return 0; |
| 578 |
|
| 579 |
len = bdrv_getlength(bs); |
| 580 |
|
| 581 |
if ((offset + size) > len)
|
| 582 |
return -EIO;
|
| 583 |
|
| 584 |
return 0; |
| 585 |
} |
| 586 |
|
| 587 |
static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, |
| 588 |
int nb_sectors)
|
| 589 |
{
|
| 590 |
return bdrv_check_byte_request(bs, sector_num * 512, nb_sectors * 512); |
| 591 |
} |
| 592 |
|
| 593 |
/* return < 0 if error. See bdrv_write() for the return codes */
|
| 594 |
int bdrv_read(BlockDriverState *bs, int64_t sector_num,
|
| 595 |
uint8_t *buf, int nb_sectors)
|
| 596 |
{
|
| 597 |
BlockDriver *drv = bs->drv; |
| 598 |
|
| 599 |
if (!drv)
|
| 600 |
return -ENOMEDIUM;
|
| 601 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
| 602 |
return -EIO;
|
| 603 |
|
| 604 |
return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
|
| 605 |
} |
| 606 |
|
| 607 |
/* Return < 0 if error. Important errors are:
|
| 608 |
-EIO generic I/O error (may happen for all errors)
|
| 609 |
-ENOMEDIUM No media inserted.
|
| 610 |
-EINVAL Invalid sector number or nb_sectors
|
| 611 |
-EACCES Trying to write a read-only device
|
| 612 |
*/
|
| 613 |
int bdrv_write(BlockDriverState *bs, int64_t sector_num,
|
| 614 |
const uint8_t *buf, int nb_sectors) |
| 615 |
{
|
| 616 |
BlockDriver *drv = bs->drv; |
| 617 |
if (!bs->drv)
|
| 618 |
return -ENOMEDIUM;
|
| 619 |
if (bs->read_only)
|
| 620 |
return -EACCES;
|
| 621 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
| 622 |
return -EIO;
|
| 623 |
|
| 624 |
return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
|
| 625 |
} |
| 626 |
|
| 627 |
int bdrv_pread(BlockDriverState *bs, int64_t offset,
|
| 628 |
void *buf, int count1) |
| 629 |
{
|
| 630 |
uint8_t tmp_buf[SECTOR_SIZE]; |
| 631 |
int len, nb_sectors, count;
|
| 632 |
int64_t sector_num; |
| 633 |
|
| 634 |
count = count1; |
| 635 |
/* first read to align to sector start */
|
| 636 |
len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
|
| 637 |
if (len > count)
|
| 638 |
len = count; |
| 639 |
sector_num = offset >> SECTOR_BITS; |
| 640 |
if (len > 0) { |
| 641 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
| 642 |
return -EIO;
|
| 643 |
memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len);
|
| 644 |
count -= len; |
| 645 |
if (count == 0) |
| 646 |
return count1;
|
| 647 |
sector_num++; |
| 648 |
buf += len; |
| 649 |
} |
| 650 |
|
| 651 |
/* read the sectors "in place" */
|
| 652 |
nb_sectors = count >> SECTOR_BITS; |
| 653 |
if (nb_sectors > 0) { |
| 654 |
if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0) |
| 655 |
return -EIO;
|
| 656 |
sector_num += nb_sectors; |
| 657 |
len = nb_sectors << SECTOR_BITS; |
| 658 |
buf += len; |
| 659 |
count -= len; |
| 660 |
} |
| 661 |
|
| 662 |
/* add data from the last sector */
|
| 663 |
if (count > 0) { |
| 664 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
| 665 |
return -EIO;
|
| 666 |
memcpy(buf, tmp_buf, count); |
| 667 |
} |
| 668 |
return count1;
|
| 669 |
} |
| 670 |
|
| 671 |
int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
|
| 672 |
const void *buf, int count1) |
| 673 |
{
|
| 674 |
uint8_t tmp_buf[SECTOR_SIZE]; |
| 675 |
int len, nb_sectors, count;
|
| 676 |
int64_t sector_num; |
| 677 |
|
| 678 |
count = count1; |
| 679 |
/* first write to align to sector start */
|
| 680 |
len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
|
| 681 |
if (len > count)
|
| 682 |
len = count; |
| 683 |
sector_num = offset >> SECTOR_BITS; |
| 684 |
if (len > 0) { |
| 685 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
| 686 |
return -EIO;
|
| 687 |
memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len);
|
| 688 |
if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) |
| 689 |
return -EIO;
|
| 690 |
count -= len; |
| 691 |
if (count == 0) |
| 692 |
return count1;
|
| 693 |
sector_num++; |
| 694 |
buf += len; |
| 695 |
} |
| 696 |
|
| 697 |
/* write the sectors "in place" */
|
| 698 |
nb_sectors = count >> SECTOR_BITS; |
| 699 |
if (nb_sectors > 0) { |
| 700 |
if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0) |
| 701 |
return -EIO;
|
| 702 |
sector_num += nb_sectors; |
| 703 |
len = nb_sectors << SECTOR_BITS; |
| 704 |
buf += len; |
| 705 |
count -= len; |
| 706 |
} |
| 707 |
|
| 708 |
/* add data from the last sector */
|
| 709 |
if (count > 0) { |
| 710 |
if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
| 711 |
return -EIO;
|
| 712 |
memcpy(tmp_buf, buf, count); |
| 713 |
if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) |
| 714 |
return -EIO;
|
| 715 |
} |
| 716 |
return count1;
|
| 717 |
} |
| 718 |
|
| 719 |
/**
|
| 720 |
* Truncate file to 'offset' bytes (needed only for file protocols)
|
| 721 |
*/
|
| 722 |
int bdrv_truncate(BlockDriverState *bs, int64_t offset)
|
| 723 |
{
|
| 724 |
BlockDriver *drv = bs->drv; |
| 725 |
if (!drv)
|
| 726 |
return -ENOMEDIUM;
|
| 727 |
if (!drv->bdrv_truncate)
|
| 728 |
return -ENOTSUP;
|
| 729 |
return drv->bdrv_truncate(bs, offset);
|
| 730 |
} |
| 731 |
|
| 732 |
/**
|
| 733 |
* Length of a file in bytes. Return < 0 if error or unknown.
|
| 734 |
*/
|
| 735 |
int64_t bdrv_getlength(BlockDriverState *bs) |
| 736 |
{
|
| 737 |
BlockDriver *drv = bs->drv; |
| 738 |
if (!drv)
|
| 739 |
return -ENOMEDIUM;
|
| 740 |
if (!drv->bdrv_getlength) {
|
| 741 |
/* legacy mode */
|
| 742 |
return bs->total_sectors * SECTOR_SIZE;
|
| 743 |
} |
| 744 |
return drv->bdrv_getlength(bs);
|
| 745 |
} |
| 746 |
|
| 747 |
/* return 0 as number of sectors if no device present or error */
|
| 748 |
void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
|
| 749 |
{
|
| 750 |
int64_t length; |
| 751 |
length = bdrv_getlength(bs); |
| 752 |
if (length < 0) |
| 753 |
length = 0;
|
| 754 |
else
|
| 755 |
length = length >> SECTOR_BITS; |
| 756 |
*nb_sectors_ptr = length; |
| 757 |
} |
| 758 |
|
| 759 |
struct partition {
|
| 760 |
uint8_t boot_ind; /* 0x80 - active */
|
| 761 |
uint8_t head; /* starting head */
|
| 762 |
uint8_t sector; /* starting sector */
|
| 763 |
uint8_t cyl; /* starting cylinder */
|
| 764 |
uint8_t sys_ind; /* What partition type */
|
| 765 |
uint8_t end_head; /* end head */
|
| 766 |
uint8_t end_sector; /* end sector */
|
| 767 |
uint8_t end_cyl; /* end cylinder */
|
| 768 |
uint32_t start_sect; /* starting sector counting from 0 */
|
| 769 |
uint32_t nr_sects; /* nr of sectors in partition */
|
| 770 |
} __attribute__((packed)); |
| 771 |
|
| 772 |
/* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
|
| 773 |
static int guess_disk_lchs(BlockDriverState *bs, |
| 774 |
int *pcylinders, int *pheads, int *psectors) |
| 775 |
{
|
| 776 |
uint8_t buf[512];
|
| 777 |
int ret, i, heads, sectors, cylinders;
|
| 778 |
struct partition *p;
|
| 779 |
uint32_t nr_sects; |
| 780 |
uint64_t nb_sectors; |
| 781 |
|
| 782 |
bdrv_get_geometry(bs, &nb_sectors); |
| 783 |
|
| 784 |
ret = bdrv_read(bs, 0, buf, 1); |
| 785 |
if (ret < 0) |
| 786 |
return -1; |
| 787 |
/* test msdos magic */
|
| 788 |
if (buf[510] != 0x55 || buf[511] != 0xaa) |
| 789 |
return -1; |
| 790 |
for(i = 0; i < 4; i++) { |
| 791 |
p = ((struct partition *)(buf + 0x1be)) + i; |
| 792 |
nr_sects = le32_to_cpu(p->nr_sects); |
| 793 |
if (nr_sects && p->end_head) {
|
| 794 |
/* We make the assumption that the partition terminates on
|
| 795 |
a cylinder boundary */
|
| 796 |
heads = p->end_head + 1;
|
| 797 |
sectors = p->end_sector & 63;
|
| 798 |
if (sectors == 0) |
| 799 |
continue;
|
| 800 |
cylinders = nb_sectors / (heads * sectors); |
| 801 |
if (cylinders < 1 || cylinders > 16383) |
| 802 |
continue;
|
| 803 |
*pheads = heads; |
| 804 |
*psectors = sectors; |
| 805 |
*pcylinders = cylinders; |
| 806 |
#if 0
|
| 807 |
printf("guessed geometry: LCHS=%d %d %d\n",
|
| 808 |
cylinders, heads, sectors);
|
| 809 |
#endif
|
| 810 |
return 0; |
| 811 |
} |
| 812 |
} |
| 813 |
return -1; |
| 814 |
} |
| 815 |
|
| 816 |
void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) |
| 817 |
{
|
| 818 |
int translation, lba_detected = 0; |
| 819 |
int cylinders, heads, secs;
|
| 820 |
uint64_t nb_sectors; |
| 821 |
|
| 822 |
/* if a geometry hint is available, use it */
|
| 823 |
bdrv_get_geometry(bs, &nb_sectors); |
| 824 |
bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); |
| 825 |
translation = bdrv_get_translation_hint(bs); |
| 826 |
if (cylinders != 0) { |
| 827 |
*pcyls = cylinders; |
| 828 |
*pheads = heads; |
| 829 |
*psecs = secs; |
| 830 |
} else {
|
| 831 |
if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { |
| 832 |
if (heads > 16) { |
| 833 |
/* if heads > 16, it means that a BIOS LBA
|
| 834 |
translation was active, so the default
|
| 835 |
hardware geometry is OK */
|
| 836 |
lba_detected = 1;
|
| 837 |
goto default_geometry;
|
| 838 |
} else {
|
| 839 |
*pcyls = cylinders; |
| 840 |
*pheads = heads; |
| 841 |
*psecs = secs; |
| 842 |
/* disable any translation to be in sync with
|
| 843 |
the logical geometry */
|
| 844 |
if (translation == BIOS_ATA_TRANSLATION_AUTO) {
|
| 845 |
bdrv_set_translation_hint(bs, |
| 846 |
BIOS_ATA_TRANSLATION_NONE); |
| 847 |
} |
| 848 |
} |
| 849 |
} else {
|
| 850 |
default_geometry:
|
| 851 |
/* if no geometry, use a standard physical disk geometry */
|
| 852 |
cylinders = nb_sectors / (16 * 63); |
| 853 |
|
| 854 |
if (cylinders > 16383) |
| 855 |
cylinders = 16383;
|
| 856 |
else if (cylinders < 2) |
| 857 |
cylinders = 2;
|
| 858 |
*pcyls = cylinders; |
| 859 |
*pheads = 16;
|
| 860 |
*psecs = 63;
|
| 861 |
if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { |
| 862 |
if ((*pcyls * *pheads) <= 131072) { |
| 863 |
bdrv_set_translation_hint(bs, |
| 864 |
BIOS_ATA_TRANSLATION_LARGE); |
| 865 |
} else {
|
| 866 |
bdrv_set_translation_hint(bs, |
| 867 |
BIOS_ATA_TRANSLATION_LBA); |
| 868 |
} |
| 869 |
} |
| 870 |
} |
| 871 |
bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); |
| 872 |
} |
| 873 |
} |
| 874 |
|
| 875 |
void bdrv_set_geometry_hint(BlockDriverState *bs,
|
| 876 |
int cyls, int heads, int secs) |
| 877 |
{
|
| 878 |
bs->cyls = cyls; |
| 879 |
bs->heads = heads; |
| 880 |
bs->secs = secs; |
| 881 |
} |
| 882 |
|
| 883 |
void bdrv_set_type_hint(BlockDriverState *bs, int type) |
| 884 |
{
|
| 885 |
bs->type = type; |
| 886 |
bs->removable = ((type == BDRV_TYPE_CDROM || |
| 887 |
type == BDRV_TYPE_FLOPPY)); |
| 888 |
} |
| 889 |
|
| 890 |
void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
| 891 |
{
|
| 892 |
bs->translation = translation; |
| 893 |
} |
| 894 |
|
| 895 |
void bdrv_get_geometry_hint(BlockDriverState *bs,
|
| 896 |
int *pcyls, int *pheads, int *psecs) |
| 897 |
{
|
| 898 |
*pcyls = bs->cyls; |
| 899 |
*pheads = bs->heads; |
| 900 |
*psecs = bs->secs; |
| 901 |
} |
| 902 |
|
| 903 |
int bdrv_get_type_hint(BlockDriverState *bs)
|
| 904 |
{
|
| 905 |
return bs->type;
|
| 906 |
} |
| 907 |
|
| 908 |
int bdrv_get_translation_hint(BlockDriverState *bs)
|
| 909 |
{
|
| 910 |
return bs->translation;
|
| 911 |
} |
| 912 |
|
| 913 |
int bdrv_is_removable(BlockDriverState *bs)
|
| 914 |
{
|
| 915 |
return bs->removable;
|
| 916 |
} |
| 917 |
|
| 918 |
int bdrv_is_read_only(BlockDriverState *bs)
|
| 919 |
{
|
| 920 |
return bs->read_only;
|
| 921 |
} |
| 922 |
|
| 923 |
int bdrv_is_sg(BlockDriverState *bs)
|
| 924 |
{
|
| 925 |
return bs->sg;
|
| 926 |
} |
| 927 |
|
| 928 |
/* XXX: no longer used */
|
| 929 |
void bdrv_set_change_cb(BlockDriverState *bs,
|
| 930 |
void (*change_cb)(void *opaque), void *opaque) |
| 931 |
{
|
| 932 |
bs->change_cb = change_cb; |
| 933 |
bs->change_opaque = opaque; |
| 934 |
} |
| 935 |
|
| 936 |
int bdrv_is_encrypted(BlockDriverState *bs)
|
| 937 |
{
|
| 938 |
if (bs->backing_hd && bs->backing_hd->encrypted)
|
| 939 |
return 1; |
| 940 |
return bs->encrypted;
|
| 941 |
} |
| 942 |
|
| 943 |
int bdrv_key_required(BlockDriverState *bs)
|
| 944 |
{
|
| 945 |
BlockDriverState *backing_hd = bs->backing_hd; |
| 946 |
|
| 947 |
if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key)
|
| 948 |
return 1; |
| 949 |
return (bs->encrypted && !bs->valid_key);
|
| 950 |
} |
| 951 |
|
| 952 |
int bdrv_set_key(BlockDriverState *bs, const char *key) |
| 953 |
{
|
| 954 |
int ret;
|
| 955 |
if (bs->backing_hd && bs->backing_hd->encrypted) {
|
| 956 |
ret = bdrv_set_key(bs->backing_hd, key); |
| 957 |
if (ret < 0) |
| 958 |
return ret;
|
| 959 |
if (!bs->encrypted)
|
| 960 |
return 0; |
| 961 |
} |
| 962 |
if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key)
|
| 963 |
return -1; |
| 964 |
ret = bs->drv->bdrv_set_key(bs, key); |
| 965 |
if (ret < 0) { |
| 966 |
bs->valid_key = 0;
|
| 967 |
} else if (!bs->valid_key) { |
| 968 |
bs->valid_key = 1;
|
| 969 |
/* call the change callback now, we skipped it on open */
|
| 970 |
bs->media_changed = 1;
|
| 971 |
if (bs->change_cb)
|
| 972 |
bs->change_cb(bs->change_opaque); |
| 973 |
} |
| 974 |
return ret;
|
| 975 |
} |
| 976 |
|
| 977 |
void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) |
| 978 |
{
|
| 979 |
if (!bs->drv) {
|
| 980 |
buf[0] = '\0'; |
| 981 |
} else {
|
| 982 |
pstrcpy(buf, buf_size, bs->drv->format_name); |
| 983 |
} |
| 984 |
} |
| 985 |
|
| 986 |
void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
| 987 |
void *opaque)
|
| 988 |
{
|
| 989 |
BlockDriver *drv; |
| 990 |
|
| 991 |
for (drv = first_drv; drv != NULL; drv = drv->next) { |
| 992 |
it(opaque, drv->format_name); |
| 993 |
} |
| 994 |
} |
| 995 |
|
| 996 |
BlockDriverState *bdrv_find(const char *name) |
| 997 |
{
|
| 998 |
BlockDriverState *bs; |
| 999 |
|
| 1000 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
| 1001 |
if (!strcmp(name, bs->device_name))
|
| 1002 |
return bs;
|
| 1003 |
} |
| 1004 |
return NULL; |
| 1005 |
} |
| 1006 |
|
| 1007 |
void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
| 1008 |
{
|
| 1009 |
BlockDriverState *bs; |
| 1010 |
|
| 1011 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
| 1012 |
it(opaque, bs); |
| 1013 |
} |
| 1014 |
} |
| 1015 |
|
| 1016 |
const char *bdrv_get_device_name(BlockDriverState *bs) |
| 1017 |
{
|
| 1018 |
return bs->device_name;
|
| 1019 |
} |
| 1020 |
|
| 1021 |
void bdrv_flush(BlockDriverState *bs)
|
| 1022 |
{
|
| 1023 |
if (!bs->drv)
|
| 1024 |
return;
|
| 1025 |
if (bs->drv->bdrv_flush)
|
| 1026 |
bs->drv->bdrv_flush(bs); |
| 1027 |
if (bs->backing_hd)
|
| 1028 |
bdrv_flush(bs->backing_hd); |
| 1029 |
} |
| 1030 |
|
| 1031 |
void bdrv_flush_all(void) |
| 1032 |
{
|
| 1033 |
BlockDriverState *bs; |
| 1034 |
|
| 1035 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) |
| 1036 |
if (bs->drv && !bdrv_is_read_only(bs) &&
|
| 1037 |
(!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) |
| 1038 |
bdrv_flush(bs); |
| 1039 |
} |
| 1040 |
|
| 1041 |
/*
|
| 1042 |
* Returns true iff the specified sector is present in the disk image. Drivers
|
| 1043 |
* not implementing the functionality are assumed to not support backing files,
|
| 1044 |
* hence all their sectors are reported as allocated.
|
| 1045 |
*
|
| 1046 |
* 'pnum' is set to the number of sectors (including and immediately following
|
| 1047 |
* the specified sector) that are known to be in the same
|
| 1048 |
* allocated/unallocated state.
|
| 1049 |
*
|
| 1050 |
* 'nb_sectors' is the max value 'pnum' should be set to.
|
| 1051 |
*/
|
| 1052 |
int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, |
| 1053 |
int *pnum)
|
| 1054 |
{
|
| 1055 |
int64_t n; |
| 1056 |
if (!bs->drv->bdrv_is_allocated) {
|
| 1057 |
if (sector_num >= bs->total_sectors) {
|
| 1058 |
*pnum = 0;
|
| 1059 |
return 0; |
| 1060 |
} |
| 1061 |
n = bs->total_sectors - sector_num; |
| 1062 |
*pnum = (n < nb_sectors) ? (n) : (nb_sectors); |
| 1063 |
return 1; |
| 1064 |
} |
| 1065 |
return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
|
| 1066 |
} |
| 1067 |
|
| 1068 |
void bdrv_info(Monitor *mon)
|
| 1069 |
{
|
| 1070 |
BlockDriverState *bs; |
| 1071 |
|
| 1072 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
| 1073 |
monitor_printf(mon, "%s:", bs->device_name);
|
| 1074 |
monitor_printf(mon, " type=");
|
| 1075 |
switch(bs->type) {
|
| 1076 |
case BDRV_TYPE_HD:
|
| 1077 |
monitor_printf(mon, "hd");
|
| 1078 |
break;
|
| 1079 |
case BDRV_TYPE_CDROM:
|
| 1080 |
monitor_printf(mon, "cdrom");
|
| 1081 |
break;
|
| 1082 |
case BDRV_TYPE_FLOPPY:
|
| 1083 |
monitor_printf(mon, "floppy");
|
| 1084 |
break;
|
| 1085 |
} |
| 1086 |
monitor_printf(mon, " removable=%d", bs->removable);
|
| 1087 |
if (bs->removable) {
|
| 1088 |
monitor_printf(mon, " locked=%d", bs->locked);
|
| 1089 |
} |
| 1090 |
if (bs->drv) {
|
| 1091 |
monitor_printf(mon, " file=");
|
| 1092 |
monitor_print_filename(mon, bs->filename); |
| 1093 |
if (bs->backing_file[0] != '\0') { |
| 1094 |
monitor_printf(mon, " backing_file=");
|
| 1095 |
monitor_print_filename(mon, bs->backing_file); |
| 1096 |
} |
| 1097 |
monitor_printf(mon, " ro=%d", bs->read_only);
|
| 1098 |
monitor_printf(mon, " drv=%s", bs->drv->format_name);
|
| 1099 |
monitor_printf(mon, " encrypted=%d", bdrv_is_encrypted(bs));
|
| 1100 |
} else {
|
| 1101 |
monitor_printf(mon, " [not inserted]");
|
| 1102 |
} |
| 1103 |
monitor_printf(mon, "\n");
|
| 1104 |
} |
| 1105 |
} |
| 1106 |
|
| 1107 |
/* The "info blockstats" command. */
|
| 1108 |
void bdrv_info_stats(Monitor *mon)
|
| 1109 |
{
|
| 1110 |
BlockDriverState *bs; |
| 1111 |
|
| 1112 |
for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
| 1113 |
monitor_printf(mon, "%s:"
|
| 1114 |
" rd_bytes=%" PRIu64
|
| 1115 |
" wr_bytes=%" PRIu64
|
| 1116 |
" rd_operations=%" PRIu64
|
| 1117 |
" wr_operations=%" PRIu64
|
| 1118 |
"\n",
|
| 1119 |
bs->device_name, |
| 1120 |
bs->rd_bytes, bs->wr_bytes, |
| 1121 |
bs->rd_ops, bs->wr_ops); |
| 1122 |
} |
| 1123 |
} |
| 1124 |
|
| 1125 |
const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
| 1126 |
{
|
| 1127 |
if (bs->backing_hd && bs->backing_hd->encrypted)
|
| 1128 |
return bs->backing_file;
|
| 1129 |
else if (bs->encrypted) |
| 1130 |
return bs->filename;
|
| 1131 |
else
|
| 1132 |
return NULL; |
| 1133 |
} |
| 1134 |
|
| 1135 |
void bdrv_get_backing_filename(BlockDriverState *bs,
|
| 1136 |
char *filename, int filename_size) |
| 1137 |
{
|
| 1138 |
if (!bs->backing_hd) {
|
| 1139 |
pstrcpy(filename, filename_size, "");
|
| 1140 |
} else {
|
| 1141 |
pstrcpy(filename, filename_size, bs->backing_file); |
| 1142 |
} |
| 1143 |
} |
| 1144 |
|
| 1145 |
int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
|
| 1146 |
const uint8_t *buf, int nb_sectors) |
| 1147 |
{
|
| 1148 |
BlockDriver *drv = bs->drv; |
| 1149 |
if (!drv)
|
| 1150 |
return -ENOMEDIUM;
|
| 1151 |
if (!drv->bdrv_write_compressed)
|
| 1152 |
return -ENOTSUP;
|
| 1153 |
return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
|
| 1154 |
} |
| 1155 |
|
| 1156 |
int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
|
| 1157 |
{
|
| 1158 |
BlockDriver *drv = bs->drv; |
| 1159 |
if (!drv)
|
| 1160 |
return -ENOMEDIUM;
|
| 1161 |
if (!drv->bdrv_get_info)
|
| 1162 |
return -ENOTSUP;
|
| 1163 |
memset(bdi, 0, sizeof(*bdi)); |
| 1164 |
return drv->bdrv_get_info(bs, bdi);
|
| 1165 |
} |
| 1166 |
|
| 1167 |
int bdrv_put_buffer(BlockDriverState *bs, const uint8_t *buf, int64_t pos, int size) |
| 1168 |
{
|
| 1169 |
BlockDriver *drv = bs->drv; |
| 1170 |
if (!drv)
|
| 1171 |
return -ENOMEDIUM;
|
| 1172 |
if (!drv->bdrv_put_buffer)
|
| 1173 |
return -ENOTSUP;
|
| 1174 |
return drv->bdrv_put_buffer(bs, buf, pos, size);
|
| 1175 |
} |
| 1176 |
|
| 1177 |
int bdrv_get_buffer(BlockDriverState *bs, uint8_t *buf, int64_t pos, int size) |
| 1178 |
{
|
| 1179 |
BlockDriver *drv = bs->drv; |
| 1180 |
if (!drv)
|
| 1181 |
return -ENOMEDIUM;
|
| 1182 |
if (!drv->bdrv_get_buffer)
|
| 1183 |
return -ENOTSUP;
|
| 1184 |
return drv->bdrv_get_buffer(bs, buf, pos, size);
|
| 1185 |
} |
| 1186 |
|
| 1187 |
/**************************************************************/
|
| 1188 |
/* handling of snapshots */
|
| 1189 |
|
| 1190 |
int bdrv_snapshot_create(BlockDriverState *bs,
|
| 1191 |
QEMUSnapshotInfo *sn_info) |
| 1192 |
{
|
| 1193 |
BlockDriver *drv = bs->drv; |
| 1194 |
if (!drv)
|
| 1195 |
return -ENOMEDIUM;
|
| 1196 |
if (!drv->bdrv_snapshot_create)
|
| 1197 |
return -ENOTSUP;
|
| 1198 |
return drv->bdrv_snapshot_create(bs, sn_info);
|
| 1199 |
} |
| 1200 |
|
| 1201 |
int bdrv_snapshot_goto(BlockDriverState *bs,
|
| 1202 |
const char *snapshot_id) |
| 1203 |
{
|
| 1204 |
BlockDriver *drv = bs->drv; |
| 1205 |
if (!drv)
|
| 1206 |
return -ENOMEDIUM;
|
| 1207 |
if (!drv->bdrv_snapshot_goto)
|
| 1208 |
return -ENOTSUP;
|
| 1209 |
return drv->bdrv_snapshot_goto(bs, snapshot_id);
|
| 1210 |
} |
| 1211 |
|
| 1212 |
int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) |
| 1213 |
{
|
| 1214 |
BlockDriver *drv = bs->drv; |
| 1215 |
if (!drv)
|
| 1216 |
return -ENOMEDIUM;
|
| 1217 |
if (!drv->bdrv_snapshot_delete)
|
| 1218 |
return -ENOTSUP;
|
| 1219 |
return drv->bdrv_snapshot_delete(bs, snapshot_id);
|
| 1220 |
} |
| 1221 |
|
| 1222 |
int bdrv_snapshot_list(BlockDriverState *bs,
|
| 1223 |
QEMUSnapshotInfo **psn_info) |
| 1224 |
{
|
| 1225 |
BlockDriver *drv = bs->drv; |
| 1226 |
if (!drv)
|
| 1227 |
return -ENOMEDIUM;
|
| 1228 |
if (!drv->bdrv_snapshot_list)
|
| 1229 |
return -ENOTSUP;
|
| 1230 |
return drv->bdrv_snapshot_list(bs, psn_info);
|
| 1231 |
} |
| 1232 |
|
| 1233 |
#define NB_SUFFIXES 4 |
| 1234 |
|
| 1235 |
char *get_human_readable_size(char *buf, int buf_size, int64_t size) |
| 1236 |
{
|
| 1237 |
static const char suffixes[NB_SUFFIXES] = "KMGT"; |
| 1238 |
int64_t base; |
| 1239 |
int i;
|
| 1240 |
|
| 1241 |
if (size <= 999) { |
| 1242 |
snprintf(buf, buf_size, "%" PRId64, size);
|
| 1243 |
} else {
|
| 1244 |
base = 1024;
|
| 1245 |
for(i = 0; i < NB_SUFFIXES; i++) { |
| 1246 |
if (size < (10 * base)) { |
| 1247 |
snprintf(buf, buf_size, "%0.1f%c",
|
| 1248 |
(double)size / base,
|
| 1249 |
suffixes[i]); |
| 1250 |
break;
|
| 1251 |
} else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { |
| 1252 |
snprintf(buf, buf_size, "%" PRId64 "%c", |
| 1253 |
((size + (base >> 1)) / base),
|
| 1254 |
suffixes[i]); |
| 1255 |
break;
|
| 1256 |
} |
| 1257 |
base = base * 1024;
|
| 1258 |
} |
| 1259 |
} |
| 1260 |
return buf;
|
| 1261 |
} |
| 1262 |
|
| 1263 |
char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) |
| 1264 |
{
|
| 1265 |
char buf1[128], date_buf[128], clock_buf[128]; |
| 1266 |
#ifdef _WIN32
|
| 1267 |
struct tm *ptm;
|
| 1268 |
#else
|
| 1269 |
struct tm tm;
|
| 1270 |
#endif
|
| 1271 |
time_t ti; |
| 1272 |
int64_t secs; |
| 1273 |
|
| 1274 |
if (!sn) {
|
| 1275 |
snprintf(buf, buf_size, |
| 1276 |
"%-10s%-20s%7s%20s%15s",
|
| 1277 |
"ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
| 1278 |
} else {
|
| 1279 |
ti = sn->date_sec; |
| 1280 |
#ifdef _WIN32
|
| 1281 |
ptm = localtime(&ti); |
| 1282 |
strftime(date_buf, sizeof(date_buf),
|
| 1283 |
"%Y-%m-%d %H:%M:%S", ptm);
|
| 1284 |
#else
|
| 1285 |
localtime_r(&ti, &tm); |
| 1286 |
strftime(date_buf, sizeof(date_buf),
|
| 1287 |
"%Y-%m-%d %H:%M:%S", &tm);
|
| 1288 |
#endif
|
| 1289 |
secs = sn->vm_clock_nsec / 1000000000;
|
| 1290 |
snprintf(clock_buf, sizeof(clock_buf),
|
| 1291 |
"%02d:%02d:%02d.%03d",
|
| 1292 |
(int)(secs / 3600), |
| 1293 |
(int)((secs / 60) % 60), |
| 1294 |
(int)(secs % 60), |
| 1295 |
(int)((sn->vm_clock_nsec / 1000000) % 1000)); |
| 1296 |
snprintf(buf, buf_size, |
| 1297 |
"%-10s%-20s%7s%20s%15s",
|
| 1298 |
sn->id_str, sn->name, |
| 1299 |
get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
|
| 1300 |
date_buf, |
| 1301 |
clock_buf); |
| 1302 |
} |
| 1303 |
return buf;
|
| 1304 |
} |
| 1305 |
|
| 1306 |
|
| 1307 |
/**************************************************************/
|
| 1308 |
/* async I/Os */
|
| 1309 |
|
| 1310 |
BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
| 1311 |
QEMUIOVector *qiov, int nb_sectors,
|
| 1312 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 1313 |
{
|
| 1314 |
BlockDriver *drv = bs->drv; |
| 1315 |
BlockDriverAIOCB *ret; |
| 1316 |
|
| 1317 |
if (!drv)
|
| 1318 |
return NULL; |
| 1319 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
| 1320 |
return NULL; |
| 1321 |
|
| 1322 |
ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors, |
| 1323 |
cb, opaque); |
| 1324 |
|
| 1325 |
if (ret) {
|
| 1326 |
/* Update stats even though technically transfer has not happened. */
|
| 1327 |
bs->rd_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
|
| 1328 |
bs->rd_ops ++; |
| 1329 |
} |
| 1330 |
|
| 1331 |
return ret;
|
| 1332 |
} |
| 1333 |
|
| 1334 |
BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
| 1335 |
QEMUIOVector *qiov, int nb_sectors,
|
| 1336 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 1337 |
{
|
| 1338 |
BlockDriver *drv = bs->drv; |
| 1339 |
BlockDriverAIOCB *ret; |
| 1340 |
|
| 1341 |
if (!drv)
|
| 1342 |
return NULL; |
| 1343 |
if (bs->read_only)
|
| 1344 |
return NULL; |
| 1345 |
if (bdrv_check_request(bs, sector_num, nb_sectors))
|
| 1346 |
return NULL; |
| 1347 |
|
| 1348 |
ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors, |
| 1349 |
cb, opaque); |
| 1350 |
|
| 1351 |
if (ret) {
|
| 1352 |
/* Update stats even though technically transfer has not happened. */
|
| 1353 |
bs->wr_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
|
| 1354 |
bs->wr_ops ++; |
| 1355 |
} |
| 1356 |
|
| 1357 |
return ret;
|
| 1358 |
} |
| 1359 |
|
| 1360 |
void bdrv_aio_cancel(BlockDriverAIOCB *acb)
|
| 1361 |
{
|
| 1362 |
acb->pool->cancel(acb); |
| 1363 |
} |
| 1364 |
|
| 1365 |
|
| 1366 |
/**************************************************************/
|
| 1367 |
/* async block device emulation */
|
| 1368 |
|
| 1369 |
static void bdrv_aio_bh_cb(void *opaque) |
| 1370 |
{
|
| 1371 |
BlockDriverAIOCBSync *acb = opaque; |
| 1372 |
|
| 1373 |
if (!acb->is_write)
|
| 1374 |
qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); |
| 1375 |
qemu_vfree(acb->bounce); |
| 1376 |
acb->common.cb(acb->common.opaque, acb->ret); |
| 1377 |
|
| 1378 |
qemu_aio_release(acb); |
| 1379 |
} |
| 1380 |
|
| 1381 |
static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
|
| 1382 |
int64_t sector_num, |
| 1383 |
QEMUIOVector *qiov, |
| 1384 |
int nb_sectors,
|
| 1385 |
BlockDriverCompletionFunc *cb, |
| 1386 |
void *opaque,
|
| 1387 |
int is_write)
|
| 1388 |
|
| 1389 |
{
|
| 1390 |
BlockDriverAIOCBSync *acb; |
| 1391 |
|
| 1392 |
acb = qemu_aio_get(bs, cb, opaque); |
| 1393 |
acb->is_write = is_write; |
| 1394 |
acb->qiov = qiov; |
| 1395 |
acb->bounce = qemu_blockalign(bs, qiov->size); |
| 1396 |
|
| 1397 |
if (!acb->bh)
|
| 1398 |
acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
| 1399 |
|
| 1400 |
if (is_write) {
|
| 1401 |
qemu_iovec_to_buffer(acb->qiov, acb->bounce); |
| 1402 |
acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
| 1403 |
} else {
|
| 1404 |
acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
| 1405 |
} |
| 1406 |
|
| 1407 |
qemu_bh_schedule(acb->bh); |
| 1408 |
|
| 1409 |
return &acb->common;
|
| 1410 |
} |
| 1411 |
|
| 1412 |
static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
|
| 1413 |
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
| 1414 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 1415 |
{
|
| 1416 |
return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
| 1417 |
} |
| 1418 |
|
| 1419 |
static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
|
| 1420 |
int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
| 1421 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 1422 |
{
|
| 1423 |
return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); |
| 1424 |
} |
| 1425 |
|
| 1426 |
|
| 1427 |
static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) |
| 1428 |
{
|
| 1429 |
BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb; |
| 1430 |
qemu_bh_cancel(acb->bh); |
| 1431 |
qemu_aio_release(acb); |
| 1432 |
} |
| 1433 |
|
| 1434 |
/**************************************************************/
|
| 1435 |
/* sync block device emulation */
|
| 1436 |
|
| 1437 |
static void bdrv_rw_em_cb(void *opaque, int ret) |
| 1438 |
{
|
| 1439 |
*(int *)opaque = ret;
|
| 1440 |
} |
| 1441 |
|
| 1442 |
#define NOT_DONE 0x7fffffff |
| 1443 |
|
| 1444 |
static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
| 1445 |
uint8_t *buf, int nb_sectors)
|
| 1446 |
{
|
| 1447 |
int async_ret;
|
| 1448 |
BlockDriverAIOCB *acb; |
| 1449 |
struct iovec iov;
|
| 1450 |
QEMUIOVector qiov; |
| 1451 |
|
| 1452 |
async_ret = NOT_DONE; |
| 1453 |
iov.iov_base = (void *)buf;
|
| 1454 |
iov.iov_len = nb_sectors * 512;
|
| 1455 |
qemu_iovec_init_external(&qiov, &iov, 1);
|
| 1456 |
acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors, |
| 1457 |
bdrv_rw_em_cb, &async_ret); |
| 1458 |
if (acb == NULL) |
| 1459 |
return -1; |
| 1460 |
|
| 1461 |
while (async_ret == NOT_DONE) {
|
| 1462 |
qemu_aio_wait(); |
| 1463 |
} |
| 1464 |
|
| 1465 |
return async_ret;
|
| 1466 |
} |
| 1467 |
|
| 1468 |
static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
| 1469 |
const uint8_t *buf, int nb_sectors) |
| 1470 |
{
|
| 1471 |
int async_ret;
|
| 1472 |
BlockDriverAIOCB *acb; |
| 1473 |
struct iovec iov;
|
| 1474 |
QEMUIOVector qiov; |
| 1475 |
|
| 1476 |
async_ret = NOT_DONE; |
| 1477 |
iov.iov_base = (void *)buf;
|
| 1478 |
iov.iov_len = nb_sectors * 512;
|
| 1479 |
qemu_iovec_init_external(&qiov, &iov, 1);
|
| 1480 |
acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors, |
| 1481 |
bdrv_rw_em_cb, &async_ret); |
| 1482 |
if (acb == NULL) |
| 1483 |
return -1; |
| 1484 |
while (async_ret == NOT_DONE) {
|
| 1485 |
qemu_aio_wait(); |
| 1486 |
} |
| 1487 |
return async_ret;
|
| 1488 |
} |
| 1489 |
|
| 1490 |
void bdrv_init(void) |
| 1491 |
{
|
| 1492 |
bdrv_register(&bdrv_raw); |
| 1493 |
bdrv_register(&bdrv_host_device); |
| 1494 |
#ifndef _WIN32
|
| 1495 |
bdrv_register(&bdrv_cow); |
| 1496 |
#endif
|
| 1497 |
bdrv_register(&bdrv_qcow); |
| 1498 |
bdrv_register(&bdrv_vmdk); |
| 1499 |
bdrv_register(&bdrv_cloop); |
| 1500 |
bdrv_register(&bdrv_dmg); |
| 1501 |
bdrv_register(&bdrv_bochs); |
| 1502 |
bdrv_register(&bdrv_vpc); |
| 1503 |
bdrv_register(&bdrv_vvfat); |
| 1504 |
bdrv_register(&bdrv_qcow2); |
| 1505 |
bdrv_register(&bdrv_parallels); |
| 1506 |
bdrv_register(&bdrv_nbd); |
| 1507 |
} |
| 1508 |
|
| 1509 |
void aio_pool_init(AIOPool *pool, int aiocb_size, |
| 1510 |
void (*cancel)(BlockDriverAIOCB *acb))
|
| 1511 |
{
|
| 1512 |
pool->aiocb_size = aiocb_size; |
| 1513 |
pool->cancel = cancel; |
| 1514 |
pool->free_aiocb = NULL;
|
| 1515 |
} |
| 1516 |
|
| 1517 |
void *qemu_aio_get_pool(AIOPool *pool, BlockDriverState *bs,
|
| 1518 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 1519 |
{
|
| 1520 |
BlockDriverAIOCB *acb; |
| 1521 |
|
| 1522 |
if (pool->free_aiocb) {
|
| 1523 |
acb = pool->free_aiocb; |
| 1524 |
pool->free_aiocb = acb->next; |
| 1525 |
} else {
|
| 1526 |
acb = qemu_mallocz(pool->aiocb_size); |
| 1527 |
acb->pool = pool; |
| 1528 |
} |
| 1529 |
acb->bs = bs; |
| 1530 |
acb->cb = cb; |
| 1531 |
acb->opaque = opaque; |
| 1532 |
return acb;
|
| 1533 |
} |
| 1534 |
|
| 1535 |
void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb,
|
| 1536 |
void *opaque)
|
| 1537 |
{
|
| 1538 |
return qemu_aio_get_pool(&bs->drv->aio_pool, bs, cb, opaque);
|
| 1539 |
} |
| 1540 |
|
| 1541 |
void qemu_aio_release(void *p) |
| 1542 |
{
|
| 1543 |
BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; |
| 1544 |
AIOPool *pool = acb->pool; |
| 1545 |
acb->next = pool->free_aiocb; |
| 1546 |
pool->free_aiocb = acb; |
| 1547 |
} |
| 1548 |
|
| 1549 |
/**************************************************************/
|
| 1550 |
/* removable device support */
|
| 1551 |
|
| 1552 |
/**
|
| 1553 |
* Return TRUE if the media is present
|
| 1554 |
*/
|
| 1555 |
int bdrv_is_inserted(BlockDriverState *bs)
|
| 1556 |
{
|
| 1557 |
BlockDriver *drv = bs->drv; |
| 1558 |
int ret;
|
| 1559 |
if (!drv)
|
| 1560 |
return 0; |
| 1561 |
if (!drv->bdrv_is_inserted)
|
| 1562 |
return 1; |
| 1563 |
ret = drv->bdrv_is_inserted(bs); |
| 1564 |
return ret;
|
| 1565 |
} |
| 1566 |
|
| 1567 |
/**
|
| 1568 |
* Return TRUE if the media changed since the last call to this
|
| 1569 |
* function. It is currently only used for floppy disks
|
| 1570 |
*/
|
| 1571 |
int bdrv_media_changed(BlockDriverState *bs)
|
| 1572 |
{
|
| 1573 |
BlockDriver *drv = bs->drv; |
| 1574 |
int ret;
|
| 1575 |
|
| 1576 |
if (!drv || !drv->bdrv_media_changed)
|
| 1577 |
ret = -ENOTSUP; |
| 1578 |
else
|
| 1579 |
ret = drv->bdrv_media_changed(bs); |
| 1580 |
if (ret == -ENOTSUP)
|
| 1581 |
ret = bs->media_changed; |
| 1582 |
bs->media_changed = 0;
|
| 1583 |
return ret;
|
| 1584 |
} |
| 1585 |
|
| 1586 |
/**
|
| 1587 |
* If eject_flag is TRUE, eject the media. Otherwise, close the tray
|
| 1588 |
*/
|
| 1589 |
void bdrv_eject(BlockDriverState *bs, int eject_flag) |
| 1590 |
{
|
| 1591 |
BlockDriver *drv = bs->drv; |
| 1592 |
int ret;
|
| 1593 |
|
| 1594 |
if (!drv || !drv->bdrv_eject) {
|
| 1595 |
ret = -ENOTSUP; |
| 1596 |
} else {
|
| 1597 |
ret = drv->bdrv_eject(bs, eject_flag); |
| 1598 |
} |
| 1599 |
if (ret == -ENOTSUP) {
|
| 1600 |
if (eject_flag)
|
| 1601 |
bdrv_close(bs); |
| 1602 |
} |
| 1603 |
} |
| 1604 |
|
| 1605 |
int bdrv_is_locked(BlockDriverState *bs)
|
| 1606 |
{
|
| 1607 |
return bs->locked;
|
| 1608 |
} |
| 1609 |
|
| 1610 |
/**
|
| 1611 |
* Lock or unlock the media (if it is locked, the user won't be able
|
| 1612 |
* to eject it manually).
|
| 1613 |
*/
|
| 1614 |
void bdrv_set_locked(BlockDriverState *bs, int locked) |
| 1615 |
{
|
| 1616 |
BlockDriver *drv = bs->drv; |
| 1617 |
|
| 1618 |
bs->locked = locked; |
| 1619 |
if (drv && drv->bdrv_set_locked) {
|
| 1620 |
drv->bdrv_set_locked(bs, locked); |
| 1621 |
} |
| 1622 |
} |
| 1623 |
|
| 1624 |
/* needed for generic scsi interface */
|
| 1625 |
|
| 1626 |
int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) |
| 1627 |
{
|
| 1628 |
BlockDriver *drv = bs->drv; |
| 1629 |
|
| 1630 |
if (drv && drv->bdrv_ioctl)
|
| 1631 |
return drv->bdrv_ioctl(bs, req, buf);
|
| 1632 |
return -ENOTSUP;
|
| 1633 |
} |
| 1634 |
|
| 1635 |
BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
| 1636 |
unsigned long int req, void *buf, |
| 1637 |
BlockDriverCompletionFunc *cb, void *opaque)
|
| 1638 |
{
|
| 1639 |
BlockDriver *drv = bs->drv; |
| 1640 |
|
| 1641 |
if (drv && drv->bdrv_aio_ioctl)
|
| 1642 |
return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque);
|
| 1643 |
return NULL; |
| 1644 |
} |
| 1645 |
|
| 1646 |
void *qemu_blockalign(BlockDriverState *bs, size_t size)
|
| 1647 |
{
|
| 1648 |
return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); |
| 1649 |
} |