#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;
}