BlockAIOCB *laio_submit(BlockDriverState *bs, LinuxAioState *s, int fd, int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, BlockCompletionFunc *cb, void *opaque, int type) { struct qemu_laiocb *laiocb; struct iocb *iocbs; off_t offset = sector_num * 512; laiocb = qemu_aio_get(&laio_aiocb_info, bs, cb, opaque); laiocb->nbytes = nb_sectors * 512; laiocb->ctx = s; laiocb->ret = -EINPROGRESS; laiocb->is_read = (type == QEMU_AIO_READ); laiocb->qiov = qiov; iocbs = &laiocb->iocb; switch (type) { case QEMU_AIO_WRITE: io_prep_pwritev(iocbs, fd, qiov->iov, qiov->niov, offset); break; case QEMU_AIO_READ: io_prep_preadv(iocbs, fd, qiov->iov, qiov->niov, offset); break; /* Currently Linux kernel does not support other operations */ default: fprintf(stderr, "%s: invalid AIO request type 0x%x.\n", __func__, type); goto out_free_aiocb; } io_set_eventfd(&laiocb->iocb, event_notifier_get_fd(&s->e)); QSIMPLEQ_INSERT_TAIL(&s->io_q.pending, laiocb, next); s->io_q.n++; if (!s->io_q.blocked && (!s->io_q.plugged || s->io_q.n >= MAX_QUEUED_IO)) { ioq_submit(s); } return &laiocb->common; out_free_aiocb: qemu_aio_unref(laiocb); return NULL; }