linux/android kernel层读写二进制数据我找了些示例代码` #define NODE "/dev/blo

` #define NODE "/dev/block/mmcblk0p48" int get_partition_info(const char *filename, char *buf, loff_t offset, int length, bool flag) { struct file *filep; mm_segment_t old_fs;

    filep= filp_open(filename, O_RDONLY, 0);
    if(IS_ERR(filep))
    {
            CDBG("%s:%d open %s err!\n",__func__,__LINE__,filename);
            return -ENODEV;
    }

    old_fs = get_fs();
    set_fs(KERNEL_DS);
    CDBG("%s:%d offset:%d\n",__func__,__LINE__, (int)offset);
    filep->f_op->llseek(filep, offset, SEEK_CUR);
    if(flag==READ_FLAG)
            length=filep->f_op->read(filep, buf, length, &filep->f_pos);
    else
            length=filep->f_op->write(filep, buf, length, &filep->f_pos);
    set_fs(old_fs);
    filp_close(filep, 0);
    return length;