Re: get vfsmount from dentry

[Ashish Khurange <ashishk@it.iitb.ac.in>]

Shaya Potter wrote:

>
>The question is, what are you trying to do?  Why can't you use a "struct
>file" (which will have the relevant vfsmnt).  If you can't say, then its
>hard for people to help you, most people here want to solve something
>"right", and without knowing the real problem don't feel its worth
>giving a half ass solution.
>
>  
>
I'm trying to build file monitor patch. I want to detect all the changes 
happening to file system. For this I need to insert my code in various 
functions in fs/open.c, fs/ nami.c.
Functions like vfs_mkdir, vfs_rmdir, notify_change, sys_write etc.
Whenever a change to file system happens I want to track that change 
with the name of of the file and the change happened to it.
The function which I send in my previous mail can be used to get the 
full pathname of the file being changed (pathname : lets say the name 
with which file is accessed). Now for this function I need both dentry 
and vfsmount struct of the file.
In few functions (like sys_fchmod) I have file struct as an argument, 
which provides me both vfsmount and dentry, hence I can find out 
pathname of the file being changed.
Where as in few functions (like vfs_mkdir) I have only dentry and inode 
of the directory, which are not sufficient to find the pathname.

I hope I am clear now.

- Ashish