Trait kernel::file::OpenAdapter

pub trait OpenAdapter<T: Sync> {
    unsafe fn convert(_inode: *mut inode, _file: *mut file) -> *const T;
}

Trait for extracting file open arguments from kernel data structures.

This is meant to be implemented by registration managers.

Required Methods

unsafe fn convert(_inode: *mut inode, _file: *mut file) -> *const T

Converts untyped data stored in [struct inode] and [struct file] (when [struct file_operations::open] is called) into the given type. For example, for miscdev devices, a pointer to the registered [struct miscdev] is stored in [struct file::private_data].

Safety

This function must be called only when [struct file_operations::open] is being called for a file that was registered by the implementer. The returned pointer must be valid and not-null.

Implementors

impl<T: Operations> OpenAdapter<<T as Operations>::OpenData> for kernel::miscdev::Registration<T>

impl<const N: usize> OpenAdapter<()> for kernel::chrdev::Registration<{ N }>