static void iscsi_refresh_limits(BlockDriverState *bs, Error **errp)
{
    /* We don't actually refresh here, but just return data queried in
     * iscsi_open(): iscsi targets don't change their limits. */

    IscsiLun *iscsilun = bs->opaque;
    uint64_t max_xfer_len = iscsilun->use_16_for_rw ? 0xffffffff : 0xffff;
    unsigned int block_size = MAX(BDRV_SECTOR_SIZE, iscsilun->block_size);

    assert(iscsilun->block_size >= BDRV_SECTOR_SIZE || bs->sg);

    bs->bl.request_alignment = block_size;

    if (iscsilun->bl.max_xfer_len) {
        max_xfer_len = MIN(max_xfer_len, iscsilun->bl.max_xfer_len);
    }

    if (max_xfer_len * block_size < INT_MAX) {
        bs->bl.max_transfer = max_xfer_len * iscsilun->block_size;
    }

    if (iscsilun->lbp.lbpu) {
        if (iscsilun->bl.max_unmap < 0xffffffff / block_size) {
            bs->bl.max_pdiscard =
                iscsilun->bl.max_unmap * iscsilun->block_size;
        }
        bs->bl.pdiscard_alignment =
            iscsilun->bl.opt_unmap_gran * iscsilun->block_size;
    } else {
        bs->bl.pdiscard_alignment = iscsilun->block_size;
    }

    if (iscsilun->bl.max_ws_len < 0xffffffff / block_size) {
        bs->bl.max_pwrite_zeroes =
            iscsilun->bl.max_ws_len * iscsilun->block_size;
    }
    if (iscsilun->lbp.lbpws) {
        bs->bl.pwrite_zeroes_alignment =
            iscsilun->bl.opt_unmap_gran * iscsilun->block_size;
    } else {
        bs->bl.pwrite_zeroes_alignment = iscsilun->block_size;
    }
    if (iscsilun->bl.opt_xfer_len &&
        iscsilun->bl.opt_xfer_len < INT_MAX / block_size) {
        bs->bl.opt_transfer = pow2floor(iscsilun->bl.opt_xfer_len *
                                        iscsilun->block_size);
    }
}
Unknown