null_mapped 1357 block/bio.c if ((iov_iter_rw(iter) == WRITE && (!map_data || !map_data->null_mapped)) || null_mapped 1369 block/bio.c if (map_data && map_data->null_mapped) null_mapped 1793 drivers/scsi/sg.c md->null_mapped = hp->dxferp ? 0 : 1; null_mapped 556 drivers/scsi/st.c mdata->null_mapped = 1; null_mapped 809 include/linux/blkdev.h int null_mapped;