On Fri, Jun 02, 2017 at 02:53:59PM -0700, Shaohua Li wrote:

From: Shaohua Li <redacted>

Add an API to export cgroup fhandle info. We don't export a full 'struct
file_handle', there are unrequired info. Sepcifically, cgroup is always
a directory, so we don't need a 'FILEID_INO32_GEN_PARENT' type fhandle,
we only need export the inode number and generation number just like
what generic_fh_to_parent does. And we can avoid the overhead of getting
an inode too, since kernfs_node has all the info required.

Can't we just make it an integral (optional) part of kernfs?  So that
cgroup just needs to indicate that it wants to expose fhandles when
creating its kernfs instance?

Thanks.

-- 
tejun