Struct MmWithUserAsync 

pub struct MmWithUserAsync { /* private fields */ }

A wrapper for the kernel’s struct mm_struct.

This type is identical to MmWithUser except that it uses mmput_async when dropping a refcount. This means that the destructor of ARef<MmWithUserAsync> is safe to call in atomic context.

Invariants

Values of this type are always refcounted using mmget. The value of mm_users is non-zero.

Methods from Deref<Target = MmWithUser>

pub fn lock_vma_under_rcu(&self, vma_addr: usize) -> Option<VmaReadGuard<'_>>

Attempt to access a vma using the vma read lock.

This is an optimistic trylock operation, so it may fail if there is contention. In that case, you should fall back to taking the mmap read lock.

pub fn vma_start_read_unlocked( &self, vma_addr: usize, ) -> Option<VmaReadGuard<'_>>

Find the VMA covering ‘address’ and read-lock it.

The fast path does not take mmap_lock. Waits for writers to finish if the VMA is being modified by taking mmap_lock. Use when mmap_lock is not held, otherwise use vma_start_read_locked(). Nothing prevents VMAs being unmapped/mapped before or after the VMA is looked up, if a stronger guarantee is required, take an mmap_lock.

Return: If a VMA exists which spans @address, return that VMA, read-locked. If no VMA is mapped there or, very unlikely, a reference count overflow occurred, return NULL.

pub fn mmap_read_lock(&self) -> MmapReadGuard<'_>

Lock the mmap read lock.

pub fn mmap_read_trylock(&self) -> Option<MmapReadGuard<'_>>

Try to lock the mmap read lock.

Methods from Deref<Target = Mm>

pub fn as_raw(&self) -> *mut mm_struct

Returns a raw pointer to the inner mm_struct.

pub fn mmget_not_zero(&self) -> Option<ARef<MmWithUser>>

Calls mmget_not_zero and returns a handle if it succeeds.

Trait Implementations

impl AlwaysRefCounted for MmWithUserAsync

fn inc_ref(&self)

Increments the reference count on the object.

unsafe fn dec_ref(obj: NonNull<Self>)

Decrements the reference count on the object.

impl Deref for MmWithUserAsync

type Target = MmWithUser

The resulting type after dereferencing.

fn deref(&self) -> &MmWithUser

Dereferences the value.

impl Send for MmWithUserAsync

impl Sync for MmWithUserAsync