static void scsi_do_read(void *opaque, int ret) { SCSIDiskReq *r = opaque; SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, r->req.dev); uint32_t n; if (r->req.aiocb != NULL) { r->req.aiocb = NULL; bdrv_acct_done(s->qdev.conf.bs, &r->acct); } if (ret < 0) { if (scsi_handle_rw_error(r, -ret)) { goto done; } } if (r->req.io_canceled) { return; } /* The request is used as the AIO opaque value, so add a ref. */ scsi_req_ref(&r->req); if (r->req.sg) { dma_acct_start(s->qdev.conf.bs, &r->acct, r->req.sg, BDRV_ACCT_READ); r->req.resid -= r->req.sg->size; r->req.aiocb = dma_bdrv_read(s->qdev.conf.bs, r->req.sg, r->sector, scsi_dma_complete, r); } else { n = scsi_init_iovec(r, SCSI_DMA_BUF_SIZE); bdrv_acct_start(s->qdev.conf.bs, &r->acct, n * BDRV_SECTOR_SIZE, BDRV_ACCT_READ); r->req.aiocb = bdrv_aio_readv(s->qdev.conf.bs, r->sector, &r->qiov, n, scsi_read_complete, r); } done: if (!r->req.io_canceled) { scsi_req_unref(&r->req); } }