+ int (*bdrv_make_empty)(BlockDriverState *bs);
+ /* aio */
+ BlockDriverAIOCB *(*bdrv_aio_readv)(BlockDriverState *bs,
+ int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
+ BlockDriverCompletionFunc *cb, void *opaque);
+ BlockDriverAIOCB *(*bdrv_aio_writev)(BlockDriverState *bs,
+ int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
+ BlockDriverCompletionFunc *cb, void *opaque);
+ BlockDriverAIOCB *(*bdrv_aio_flush)(BlockDriverState *bs,
+ BlockDriverCompletionFunc *cb, void *opaque);
+
+ int (*bdrv_aio_multiwrite)(BlockDriverState *bs, BlockRequest *reqs,
+ int num_reqs);
+ int (*bdrv_merge_requests)(BlockDriverState *bs, BlockRequest* a,
+ BlockRequest *b);
+
+
+ const char *protocol_name;
+ int (*bdrv_truncate)(BlockDriverState *bs, int64_t offset);
+ int64_t (*bdrv_getlength)(BlockDriverState *bs);
+ int (*bdrv_write_compressed)(BlockDriverState *bs, int64_t sector_num,
+ const uint8_t *buf, int nb_sectors);
+
+ int (*bdrv_snapshot_create)(BlockDriverState *bs,
+ QEMUSnapshotInfo *sn_info);
+ int (*bdrv_snapshot_goto)(BlockDriverState *bs,
+ const char *snapshot_id);
+ int (*bdrv_snapshot_delete)(BlockDriverState *bs, const char *snapshot_id);
+ int (*bdrv_snapshot_list)(BlockDriverState *bs,
+ QEMUSnapshotInfo **psn_info);
+ int (*bdrv_get_info)(BlockDriverState *bs, BlockDriverInfo *bdi);
+
+ int (*bdrv_save_vmstate)(BlockDriverState *bs, const uint8_t *buf,
+ int64_t pos, int size);
+ int (*bdrv_load_vmstate)(BlockDriverState *bs, uint8_t *buf,
+ int64_t pos, int size);
+
+ int (*bdrv_change_backing_file)(BlockDriverState *bs,
+ const char *backing_file, const char *backing_fmt);
+
+ /* removable device specific */
+ int (*bdrv_is_inserted)(BlockDriverState *bs);
+ int (*bdrv_media_changed)(BlockDriverState *bs);
+ int (*bdrv_eject)(BlockDriverState *bs, int eject_flag);
+ int (*bdrv_set_locked)(BlockDriverState *bs, int locked);
+
+ /* to control generic scsi devices */
+ int (*bdrv_ioctl)(BlockDriverState *bs, unsigned long int req, void *buf);
+ BlockDriverAIOCB *(*bdrv_aio_ioctl)(BlockDriverState *bs,
+ unsigned long int req, void *buf,
+ BlockDriverCompletionFunc *cb, void *opaque);
+
+ /* List of options for creating images, terminated by name == NULL */
+ QEMUOptionParameter *create_options;
+
+
+ /*
+ * Returns 0 for completed check, -errno for internal errors.
+ * The check results are stored in result.
+ */
+ int (*bdrv_check)(BlockDriverState* bs, BdrvCheckResult *result);
+
+ void (*bdrv_debug_event)(BlockDriverState *bs, BlkDebugEvent event);
+
+ /* Set if newly created images are not guaranteed to contain only zeros */
+ int no_zero_init;
+
+ QLIST_ENTRY(BlockDriver) list;