subspace_farmer::single_disk_farm::direct_io_file

Struct DirectIoFile

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pub struct DirectIoFile { /* private fields */ }
Expand description

Wrapper data structure for direct/unbuffered I/O

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impl DirectIoFile

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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.

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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§

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impl Debug for DirectIoFile

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

Formats the value using the given formatter. Read more
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impl FileExt for DirectIoFile

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

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

Make sure file has specified number of bytes allocated for it
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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
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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
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fn disable_cache(&self) -> Result<()>

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

Read exact number of bytes at a specific offset
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fn write_all_at(&self, buf: &[u8], offset: u64) -> Result<()>

Write all provided bytes at a specific offset
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impl ReadAtSync for &DirectIoFile

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

Fill the buffer by reading bytes at a specific offset
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fn offset(&self, offset: u64) -> ReadAtOffset<'_, Self>
where Self: Sized,

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

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

Fill the buffer by reading bytes at a specific offset
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fn offset(&self, offset: u64) -> ReadAtOffset<'_, Self>
where Self: Sized,

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

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