Module virt

Virtual memory.

This module deals with managing a single VMA in the address space of a userspace process. Each VMA corresponds to a region of memory that the userspace process can access, and the VMA lets you control what happens when userspace reads or writes to that region of memory.

The module has several different Rust types that all correspond to the C type called vm_area_struct. The different structs represent what kind of access you have to the VMA, e.g. VmaRef is used when you hold the mmap or vma read lock. Using the appropriate struct ensures that you can’t, for example, accidentally call a function that requires holding the write lock when you only hold the read lock.

Modules

flags

All possible flags for VmaRef.

Structs

VmaMixedMap

A wrapper for the kernel’s struct vm_area_struct with read access and VM_MIXEDMAP set.

VmaNew

A configuration object for setting up a VMA in an f_ops->mmap() hook.

VmaRef

A wrapper for the kernel’s struct vm_area_struct with read access.

Type Aliases

vm_flags_t

The integer type used for vma flags.