# Re: \[PATCH v30 06/12\] fs,security: Add sb\_delete hook

- From: Kees Cook \<hidden\>
- Date: 2021-03-19 17:26:00 
- List: linux-doc
- Page: https://ratatoskr.run/linux-doc/2021/03/202037
- Thread: https://ratatoskr.run/linux-api/2021/03/201801/t.md

```text
On Tue, Mar 16, 2021 at 09:42:46PM +0100, Mickaël Salaün wrote:
> From: Mickaël Salaün <redacted>
> 
> The sb_delete security hook is called when shutting down a superblock,
> which may be useful to release kernel objects tied to the superblock's
> lifetime (e.g. inodes).
> 
> This new hook is needed by Landlock to release (ephemerally) tagged
> struct inodes.  This comes from the unprivileged nature of Landlock
> described in the next commit.
> 
> Cc: Al Viro <viro@zeniv.linux.org.uk>
> Cc: James Morris <jmorris@namei.org>
> Cc: Kees Cook <redacted>
> Signed-off-by: Mickaël Salaün <redacted>

Reviewed-by: Kees Cook <redacted>

-- 
Kees Cook
```