fs/ioctl: Add a comment to keep the logic in sync with the Landlock LSM

Landlock's IOCTL support needs to partially replicate the list of
IOCTLs from do_vfs_ioctl().  The list of commands implemented in
do_vfs_ioctl() should be kept in sync with Landlock's IOCTL policies.

Signed-off-by: Günther Noack <gnoack@google.com>
Link: https://lore.kernel.org/r/20240327131040.158777-11-gnoack@google.com
Signed-off-by: Mickaël Salaün <mic@digikod.net>

Author: gnoack

fs/ioctl.c

@@ -796,6 +796,9 @@ static int ioctl_get_fs_sysfs_path(struct file *file, void __user *argp)
  *
  * When you add any new common ioctls to the switches above and below,
  * please ensure they have compatible arguments in compat mode.
+ *
+ * The commands which are implemented here should be kept in sync with the IOCTL
+ * security policies in the Landlock LSM.
  */
 static int do_vfs_ioctl(struct file *filp, unsigned int fd,
 			unsigned int cmd, unsigned long arg)