static void scsi_read_data(SCSIRequest *req) { SCSIDiskReq *r = DO_UPCAST(SCSIDiskReq, req, req); SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, r->req.dev); bool first; DPRINTF("Read sector_count=%d\n", r->sector_count); if (r->sector_count == 0) { /* This also clears the sense buffer for REQUEST SENSE. */ scsi_req_complete(&r->req, GOOD); return; } /* No data transfer may already be in progress */ assert(r->req.aiocb == NULL); /* The request is used as the AIO opaque value, so add a ref. */ scsi_req_ref(&r->req); if (r->req.cmd.mode == SCSI_XFER_TO_DEV) { DPRINTF("Data transfer direction invalid\n"); scsi_read_complete(r, -EINVAL); return; } if (s->tray_open) { scsi_read_complete(r, -ENOMEDIUM); return; } first = !r->started; r->started = true; if (first && r->need_fua_emulation) { block_acct_start(blk_get_stats(s->qdev.conf.blk), &r->acct, 0, BLOCK_ACCT_FLUSH); r->req.aiocb = blk_aio_flush(s->qdev.conf.blk, scsi_do_read_cb, r); } else { scsi_do_read(r, 0); } }
static void scsi_read_data(SCSIRequest *req) { SCSIDiskReq *r = DO_UPCAST(SCSIDiskReq, req, req); SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, r->req.dev); bool first; DPRINTF("Read sector_count=%d\n", r->sector_count); if (r->sector_count == 0) {   scsi_req_complete(&r->req, GOOD); return; }   assert(r->req.aiocb == NULL);   scsi_req_ref(&r->req); if (r->req.cmd.mode == SCSI_XFER_TO_DEV) { DPRINTF("Data transfer direction invalid\n"); scsi_read_complete(r, -EINVAL); return; } if (s->tray_open) { scsi_read_complete(r, -ENOMEDIUM); return; } first = !r->started; r->started = true; if (first && r->need_fua_emulation) { block_acct_start(blk_get_stats(s->qdev.conf.blk), &r->acct, 0, BLOCK_ACCT_FLUSH); r->req.aiocb = blk_aio_flush(s->qdev.conf.blk, scsi_do_read_cb, r); } else { scsi_do_read(r, 0); } }