[−][src]Trait vblk::BlockDevice

pub trait BlockDevice {
    fn block_size(&self) -> u32;
    fn blocks(&self) -> u64;

    fn read(&mut self, offset: u64, bytes: &mut [u8]) -> Result<()> { ... }
    fn write(&mut self, offset: u64, bytes: &[u8]) -> Result<()> { ... }
    fn flush(&mut self) -> Result<()> { ... }
    fn trim(&mut self, offset: u64, len: u32) -> Result<()> { ... }
    fn unmount(&mut self) { ... }
}

A virtual block device.

Required methods

`fn block_size(&self) -> u32`

Returns the device block size in bytes.

According to the NBD kernel source code, the block size must currently be a power of two between 512 bytes and the system page size in bytes.

`fn blocks(&self) -> u64`

Returns the device size in blocks.

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Provided methods

`fn read(&mut self, offset: u64, bytes: &mut [u8]) -> Result<()>`

Reads a byte range from the block device.

Note

If you return an I/O error not associated with an OS errno, vblk will automatically return an EIO error to the caller by default.

`fn write(&mut self, offset: u64, bytes: &[u8]) -> Result<()>`

Writes a byte range to the block device.

Note

If you return an I/O error not associated with an OS errno, vblk will automatically return an EIO error to the caller by default.

`fn flush(&mut self) -> Result<()>`

Flushes any cached data to the block device.

Note

If you return an I/O error not associated with an OS errno, vblk will automatically return an EIO error to the caller by default.

Warning

Support for this command depends on your Linux kernel version.

`fn trim(&mut self, offset: u64, len: u32) -> Result<()>`

Trims a byte range of the block device.

Note

If you return an I/O error not associated with an OS errno, vblk will automatically return an EIO error to the caller by default.

Warning

Support for this command depends on your Linux kernel version.

`fn unmount(&mut self)`

Called when the block device is unmounted.

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Implementors

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