Function fs_node_setsecurity 

pub fn fs_node_setsecurity<L>(
    locked: &mut Locked<L>,
    current_task: &CurrentTask,
    fs_node: &FsNode,
    name: &FsStr,
    value: &FsStr,
    op: XattrOp,
) -> Result<(), Errno>
where
    L: LockEqualOrBefore<FileOpsCore>,

Called when an extended attribute with “security.”-prefixed name is being set, after having passed the discretionary and check_fs_node_setxattr_access() permission-checks. This allows the LSM (e.g. SELinux) to update internal state as necessary for xattr changes.

Partially corresponds to the inode_setsecurity() and inode_post_setxattr() LSM hooks.