fs,security: Add sb_delete hook

mainline inclusion
from mainline-v5.13-rc1
commit 83e804f0
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I6DJU0
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=83e804f0bfee2247b1c0aa64845c81a38562da7a



--------------------------------

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>
Signed-off-by: Mickaël Salaün <mic@linux.microsoft.com>
Reviewed-by: Jann Horn <jannh@google.com>
Acked-by: Serge Hallyn <serge@hallyn.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20210422154123.13086-7-mic@digikod.net


Signed-off-by: James Morris <jamorris@linux.microsoft.com>
Signed-off-by: Yi Yang <yiyang13@huawei.com>