Do some todos (#1092)

* Do some todos

* Add a `MOVE_MOUNT_BENEATH` constant to linux_raw as a temporary workaround.

* Document that `MOVE_MOUNT_BENEATH` is since Linux 6.5.

---------

Co-authored-by: Dan Gohman <[email protected]>

Author: primoly

src/backend/libc/mount/types.rs

@@ -227,9 +227,8 @@ bitflags! {
         /// `MOVE_MOUNT__MASK`
         const MOVE_MOUNT_SET_GROUP = 0x0000_0100;
 
-        // TODO: add when Linux 6.5 is released
-        // /// `MOVE_MOUNT_BENEATH`
-        // const MOVE_MOUNT_BENEATH = 0x0000_0200;
+        /// `MOVE_MOUNT_BENEATH` (since Linux 6.5)
+        const MOVE_MOUNT_BENEATH = 0x0000_0200;
 
         /// `MOVE_MOUNT__MASK`
         const MOVE_MOUNT__MASK = 0x0000_0377;

src/backend/linux_raw/c.rs

@@ -320,3 +320,6 @@ pub(crate) use reboot_symbols::*;
 
 // TODO: This is new in Linux 6.11; remove when linux-raw-sys is updated.
 pub(crate) const MAP_DROPPABLE: u32 = 0x8;
+
+// TODO: This is new in Linux 6.5; remove when linux-raw-sys is updated.
+pub(crate) const MOVE_MOUNT_BENEATH: u32 = 0x200;

src/backend/linux_raw/mount/types.rs

@@ -223,9 +223,8 @@ bitflags! {
         /// `MOVE_MOUNT__MASK`
         const MOVE_MOUNT_SET_GROUP = linux_raw_sys::general::MOVE_MOUNT_SET_GROUP;
 
-        // TODO: add when Linux 6.5 is released
-        // /// `MOVE_MOUNT_BENEATH`
-        // const MOVE_MOUNT_BENEATH = linux_raw_sys::general::MOVE_MOUNT_BENEATH;
+        /// `MOVE_MOUNT_BENEATH` (since Linux 6.5)
+        const MOVE_MOUNT_BENEATH = c::MOVE_MOUNT_BENEATH;
 
         /// `MOVE_MOUNT__MASK`
         const MOVE_MOUNT__MASK = linux_raw_sys::general::MOVE_MOUNT__MASK;