+ module_call_init(MODULE_INIT_BLOCK);
+}
+
+void aio_pool_init(AIOPool *pool, int aiocb_size,
+ void (*cancel)(BlockDriverAIOCB *acb))
+{
+ pool->aiocb_size = aiocb_size;
+ pool->cancel = cancel;
+ pool->free_aiocb = NULL;
+}
+
+void *qemu_aio_get_pool(AIOPool *pool, BlockDriverState *bs,
+ BlockDriverCompletionFunc *cb, void *opaque)
+{
+ BlockDriverAIOCB *acb;
+
+ if (pool->free_aiocb) {
+ acb = pool->free_aiocb;
+ pool->free_aiocb = acb->next;
+ } else {
+ acb = qemu_mallocz(pool->aiocb_size);
+ acb->pool = pool;
+ }
+ acb->bs = bs;
+ acb->cb = cb;
+ acb->opaque = opaque;
+ return acb;
+}
+
+void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb,
+ void *opaque)
+{
+ return qemu_aio_get_pool(&bs->drv->aio_pool, bs, cb, opaque);
+}
+
+void qemu_aio_release(void *p)
+{
+ BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p;
+ AIOPool *pool = acb->pool;
+ acb->next = pool->free_aiocb;
+ pool->free_aiocb = acb;
+}
+
+/**************************************************************/
+/* removable device support */
+
+/**
+ * Return TRUE if the media is present
+ */
+int bdrv_is_inserted(BlockDriverState *bs)
+{
+ BlockDriver *drv = bs->drv;
+ int ret;
+ if (!drv)
+ return 0;
+ if (!drv->bdrv_is_inserted)
+ return 1;
+ ret = drv->bdrv_is_inserted(bs);
+ return ret;
+}
+
+/**
+ * Return TRUE if the media changed since the last call to this
+ * function. It is currently only used for floppy disks
+ */
+int bdrv_media_changed(BlockDriverState *bs)
+{
+ BlockDriver *drv = bs->drv;
+ int ret;
+
+ if (!drv || !drv->bdrv_media_changed)
+ ret = -ENOTSUP;
+ else
+ ret = drv->bdrv_media_changed(bs);
+ if (ret == -ENOTSUP)
+ ret = bs->media_changed;
+ bs->media_changed = 0;
+ return ret;
+}
+
+/**
+ * If eject_flag is TRUE, eject the media. Otherwise, close the tray
+ */
+void bdrv_eject(BlockDriverState *bs, int eject_flag)
+{
+ BlockDriver *drv = bs->drv;
+ int ret;
+
+ if (!drv || !drv->bdrv_eject) {
+ ret = -ENOTSUP;
+ } else {
+ ret = drv->bdrv_eject(bs, eject_flag);
+ }
+ if (ret == -ENOTSUP) {
+ if (eject_flag)
+ bdrv_close(bs);
+ }
+}
+
+int bdrv_is_locked(BlockDriverState *bs)
+{
+ return bs->locked;
+}
+
+/**
+ * Lock or unlock the media (if it is locked, the user won't be able
+ * to eject it manually).
+ */
+void bdrv_set_locked(BlockDriverState *bs, int locked)
+{
+ BlockDriver *drv = bs->drv;
+
+ bs->locked = locked;
+ if (drv && drv->bdrv_set_locked) {
+ drv->bdrv_set_locked(bs, locked);
+ }
+}
+
+/* needed for generic scsi interface */
+
+int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
+{
+ BlockDriver *drv = bs->drv;
+
+ if (drv && drv->bdrv_ioctl)
+ return drv->bdrv_ioctl(bs, req, buf);
+ return -ENOTSUP;
+}
+
+BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs,
+ unsigned long int req, void *buf,
+ BlockDriverCompletionFunc *cb, void *opaque)
+{
+ BlockDriver *drv = bs->drv;
+
+ if (drv && drv->bdrv_aio_ioctl)
+ return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque);
+ return NULL;
+}
+
+void *qemu_blockalign(BlockDriverState *bs, size_t size)
+{
+ return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size);