static int coroutine_fn iscsi_co_readv(BlockDriverState *bs, int64_t sector_num, int nb_sectors, QEMUIOVector *iov) { IscsiLun *iscsilun = bs->opaque; struct IscsiTask iTask; uint64_t lba; uint32_t num_sectors; if (!is_sector_request_lun_aligned(sector_num, nb_sectors, iscsilun)) { return -EINVAL; } if (bs->bl.max_transfer_length && nb_sectors > bs->bl.max_transfer_length) { error_report("iSCSI Error: Read of %d sectors exceeds max_xfer_len " "of %d sectors", nb_sectors, bs->bl.max_transfer_length); return -EINVAL; } if (iscsilun->lbprz && nb_sectors >= ISCSI_CHECKALLOC_THRES && !iscsi_allocationmap_is_allocated(iscsilun, sector_num, nb_sectors)) { int64_t ret; int pnum; BlockDriverState *file; ret = iscsi_co_get_block_status(bs, sector_num, INT_MAX, &pnum, &file); if (ret < 0) { return ret; } if (ret & BDRV_BLOCK_ZERO && pnum >= nb_sectors) { qemu_iovec_memset(iov, 0, 0x00, iov->size); return 0; } } lba = sector_qemu2lun(sector_num, iscsilun); num_sectors = sector_qemu2lun(nb_sectors, iscsilun); iscsi_co_init_iscsitask(iscsilun, &iTask); retry: if (iscsilun->use_16_for_rw) { iTask.task = iscsi_read16_task(iscsilun->iscsi, iscsilun->lun, lba, num_sectors * iscsilun->block_size, iscsilun->block_size, 0, 0, 0, 0, 0, iscsi_co_generic_cb, &iTask); } else { iTask.task = iscsi_read10_task(iscsilun->iscsi, iscsilun->lun, lba, num_sectors * iscsilun->block_size, iscsilun->block_size, 0, 0, 0, 0, 0, iscsi_co_generic_cb, &iTask); } if (iTask.task == NULL) { return -ENOMEM; } scsi_task_set_iov_in(iTask.task, (struct scsi_iovec *) iov->iov, iov->niov); while (!iTask.complete) { iscsi_set_events(iscsilun); qemu_coroutine_yield(); } if (iTask.task != NULL) { scsi_free_scsi_task(iTask.task); iTask.task = NULL; } if (iTask.do_retry) { iTask.complete = 0; goto retry; } if (iTask.status != SCSI_STATUS_GOOD) { return iTask.err_code; } return 0; }