cuttlefish::Qcow2Image Class Reference

#include <qcow2.h>

Inheritance diagram for cuttlefish::Qcow2Image:

Collaboration diagram for cuttlefish::Qcow2Image:

Classes
struct	Impl

Public Member Functions
	Qcow2Image (Qcow2Image &&)
	~Qcow2Image () override
Qcow2Image &	operator= (Qcow2Image &&)
Result< uint64_t >	VirtualSizeBytes () const override
Public Member Functions inherited from cuttlefish::DiskImage
virtual	~DiskImage ()=default
DiskImage &	operator= (DiskImage &&)=delete
virtual Result< uint64_t >	VirtualSizeBytes () const =0

Static Public Member Functions
static Result< Qcow2Image >	Create (const std::string &crosvm_path, const std::string &backing_file, std::string output_overlay_path)
static Result< Qcow2Image >	OpenExisting (std::string path)
static std::string	MagicString ()

Private Member Functions
	Qcow2Image (std::unique_ptr< Impl >)

Private Attributes
std::unique_ptr< Impl >	impl_

Detailed Description

qcow, or "QEMU Copy-On-Write" is a file format containing a list of disk offsets and file contents. This can be combined with a backing file, to represent an original disk file plus disk updates over that file. The qcow files can be swapped out and replaced without affecting the original. qcow is supported by QEMU and crosvm.

Constructor & Destructor Documentation

Qcow2Image() [1/2]

cuttlefish::Qcow2Image::Qcow2Image

(

Qcow2Image &&

other

)

~Qcow2Image()

cuttlefish::Qcow2Image::~Qcow2Image ( )

overridedefault

Qcow2Image() [2/2]

cuttlefish::Qcow2Image::Qcow2Image ( std::unique_ptr< Impl >  impl )

private

Member Function Documentation

Create()

Result< Qcow2Image > cuttlefish::Qcow2Image::Create ( const std::string &  crosvm_path, const std::string &  backing_file, std::string  output_overlay_path  )

static

Generate a qcow overlay backed by a given implementation file.

The crosvm binary at crosvm_path is used to generate an overlay file at output_overlay_path that functions as an overlay on the file at backing_file.

MagicString()

std::string cuttlefish::Qcow2Image::MagicString ( )

static

"QCOW magic string", used to identify the file type.

Valid qcow2 files start with this prefix.

https://gitlab.com/qemu-project/qemu/-/blob/master/docs/interop/qcow2.rst

OpenExisting()

Result< Qcow2Image > cuttlefish::Qcow2Image::OpenExisting ( std::string  path )

static

operator=()

Qcow2Image & cuttlefish::Qcow2Image::operator=

(

Qcow2Image &&

other

)

VirtualSizeBytes()

Result< uint64_t > cuttlefish::Qcow2Image::VirtualSizeBytes ( ) const

overridevirtual

Implements cuttlefish::DiskImage.

Member Data Documentation

impl_

std::unique_ptr<Impl> cuttlefish::Qcow2Image::impl_

private

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The documentation for this class was generated from the following files:

• cuttlefish/host/libs/image_aggregator/qcow2.h
• cuttlefish/host/libs/image_aggregator/qcow2.cc