Struct DirectIoFileWrapper 

pub struct DirectIoFileWrapper { /* private fields */ }

Wrapper data structure for direct/unbuffered I/O

Implementations

impl DirectIoFileWrapper

pub fn open<P>(path: P) -> Result<Self>

where P: AsRef<Path>,

Open file at specified path for direct/unbuffered I/O for reads (if file doesn’t exist, it will be created).

This is especially important on Windows to prevent huge memory usage.

pub fn set_len(&self, size: u64) -> Result<()>

Truncates or extends the underlying file, updating the size of this file to become size.

Trait Implementations

impl Debug for DirectIoFileWrapper

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl FileExt for DirectIoFileWrapper

fn size(&self) -> Result<u64>

Get file size

fn preallocate(&self, len: u64) -> Result<()>

Make sure file has specified number of bytes allocated for it

fn advise_random_access(&self) -> Result<()>

Advise OS/file system that file will use random access and read-ahead behavior is undesirable, on Windows this can only be set when file is opened, see OpenOptionsExt

fn advise_sequential_access(&self) -> Result<()>

Advise OS/file system that file will use sequential access and read-ahead behavior is desirable, on Windows this can only be set when file is opened, see OpenOptionsExt

fn disable_cache(&self) -> Result<()>

Disable cache on macOS

fn read_exact_at(&self, buf: &mut [u8], offset: u64) -> Result<()>

Read exact number of bytes at a specific offset

fn write_all_at(&self, buf: &[u8], offset: u64) -> Result<()>

Write all provided bytes at a specific offset

impl ReadAtSync for &DirectIoFileWrapper

fn read_at(&self, buf: &mut [u8], offset: u64) -> Result<()>

Fill the buffer by reading bytes at a specific offset

fn offset(&self, offset: u64) -> ReadAtOffset<'_, Self>

where Self: Sized,

Get implementation of ReadAtSync that add specified offset to all attempted reads

impl ReadAtSync for DirectIoFileWrapper

fn read_at(&self, buf: &mut [u8], offset: u64) -> Result<()>

Fill the buffer by reading bytes at a specific offset

fn offset(&self, offset: u64) -> ReadAtOffset<'_, Self>

where Self: Sized,

Get implementation of ReadAtSync that add specified offset to all attempted reads