Hi all ,
I wanted to free a data block from disk. So I made a loop device for ext2 fs and inserted my module(code) through insmod command.

Here are the details :
 I found a function named ext2_free_data() which takes block numbers to be freed as a parameter. The declaration of the function is as follows :
void ext2_free_data(struct inode *inode, __le32 *p, __le32 *q);

As we can see this function use structure of inode object and it make changes in this inode object.

This function changes the fields in in-core inode and mark the inode dirty. 
But I want the changes made in in-core inode to be reflected in disk inode immediately .


Is there any command to flush the buffers ?


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Regards,
Kashish