Lustre discuss - May 2006 - How to open and read directory in obdfilter?

On Apr 22, 2005  00:30 -0500, Dingshan He wrote:
> I am trying to extend the obdfilter module to do some HSM related work. I
> need to implement the function to read the directories of
"/O/0/d*" in order
> to know what files are there.
> 
> My question is how can I open directory files and read the entries in the
> kernel.
The code in mds_cleanup_orphans() does essentially this - traverse a directory
and handle each entry from within the kernel.

Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.

I am trying to extend the obdfilter module to do some HSM related work. I
need to implement the function to read the directories of "/O/0/d*" in
order
to know what files are there.

 

My question is how can I open directory files and read the entries in the
kernel.

 

I have tried to use filp_open("O/0/d0", O_RDONLY | O_DIRECTORY, 0) but
it
returns an error saying "Is a directory".  So, what is the correct way
to
open a dir in the kernel?

 

For reading an opened directory, I assume that I can use vfs_readdir(). Am I
right?

 

Thanks for any help!