# Re: \[PATCH V4 07/12\] cgroup: export fhandle info for a cgroup

- From: Tejun Heo \<tj@kernel.org\>
- Date: 2017-06-28 18:13:07 
- List: linux-block
- Page: https://ratatoskr.run/linux-block/2017/06/5031982
- Thread: https://ratatoskr.run/linux-block/2017/06/5031858/t.md

```text
On Wed, Jun 28, 2017 at 09:29:57AM -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_dentry does. And we can avoid the overhead of getting
> an inode too, since kernfs_node_id (ino and generation) has all the info
> required.
> 
> Signed-off-by: Shaohua Li <redacted>

Acked-by: Tejun Heo <tj@kernel.org>

Thanks.

-- 
tejun
```