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package fs
// A BlockDevice is the raw device that is meant to store a filesystem.
type BlockDevice interface {
// Closes this block device. No more methods may be called on a
// closed device.
Close() error
// Len returns the number of bytes in this block device.
Len() int64
// SectorSize returns the size of a single sector on this device.
SectorSize() int
// ReadAt reads data from the block device from the given
// offset. See io.ReaderAt for more information on this function.
ReadAt(p []byte, off int64) (n int, err error)
// WriteAt writes data to the block device at the given offset.
// See io.WriterAt for more information on this function.
WriteAt(p []byte, off int64) (n int, err error)
}
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