Some problem about the function pointer revalidate in inode_operations in 2.4.20
 

In kernel-2.4.20, there was a function pointer named revalidate defined in struct inode＿operations, but in kernel-2.6.27, this function pointer was removed, which function took place of it? If code based on kernel-2.4.20 is :
dentry->d_inode->i_op->revalidate(dentry)

How do I change it ?

You should be able to find the answer to your question at the following web site.

https://www.linuxhq.com/

Or you could use Google.