contur::SimpleFS Class Reference

In-memory educational filesystem with inode + block allocation model. More...

#include <simple_fs.h>

Inheritance diagram for contur::SimpleFS:

Collaboration diagram for contur::SimpleFS:

Public Member Functions
	SimpleFS (std::size_t totalBlocks=256, std::size_t blockSize=512)
	Constructs filesystem over simulated disk blocks.
	~SimpleFS () override
	SimpleFS (const SimpleFS &)=delete
SimpleFS &	operator= (const SimpleFS &)=delete
	SimpleFS (SimpleFS &&) noexcept
SimpleFS &	operator= (SimpleFS &&) noexcept
Result< FileDescriptor >	open (const std::string &path, OpenMode mode) override
	Opens file path with requested mode.
Result< std::size_t >	read (FileDescriptor fd, std::span< std::byte > buffer) override
	Reads bytes from descriptor into buffer.
Result< std::size_t >	write (FileDescriptor fd, std::span< const std::byte > data) override
	Writes bytes from data into descriptor stream.
Result< void >	close (FileDescriptor fd) override
	Closes open descriptor.
Result< void >	mkdir (const std::string &path) override
	Creates a directory at path.
Result< void >	remove (const std::string &path) override
	Removes file or empty directory at path.
Result< std::vector< DirectoryEntry > >	listDir (const std::string &path) const override
	Lists child entries in directory.
Result< InodeInfo >	stat (const std::string &path) const override
	Returns metadata for path.
Public Member Functions inherited from contur::IFileSystem
virtual	~IFileSystem ()=default

Private Attributes
std::unique_ptr< Impl >	impl_

Detailed Description

In-memory educational filesystem with inode + block allocation model.

SimpleFS keeps all metadata and block data in memory and implements basic directory traversal, file read/write via descriptors, and stat/list operations suitable for kernel-simulator demos and tests.

Definition at line 17 of file simple_fs.h.

Constructor & Destructor Documentation

SimpleFS() [1/3]

contur::SimpleFS::SimpleFS ( std::size_t totalBlocks = 256, std::size_t blockSize = 512 )

explicit

Constructs filesystem over simulated disk blocks.

Parameters

totalBlocks	Number of simulated disk blocks.
blockSize	Size of each block in bytes.

~SimpleFS()

contur::SimpleFS::~SimpleFS ( )

override

SimpleFS() [2/3]

contur::SimpleFS::SimpleFS ( const SimpleFS & )

delete

SimpleFS() [3/3]

contur::SimpleFS::SimpleFS ( SimpleFS && )

noexcept

Member Function Documentation

close()

Result< void > contur::SimpleFS::close ( FileDescriptor fd )

nodiscardoverridevirtual

Closes open descriptor.

Parameters

fd	Descriptor to close.

Returns

Ok on success; NotFound if descriptor is unknown.

Implements contur::IFileSystem.

listDir()

Result< std::vector< DirectoryEntry > > contur::SimpleFS::listDir ( const std::string & path ) const

nodiscardoverridevirtual

Lists child entries in directory.

Parameters

path	Absolute directory path.

Returns

Entries on success; error code otherwise.

Implements contur::IFileSystem.

mkdir()

Result< void > contur::SimpleFS::mkdir ( const std::string & path )

nodiscardoverridevirtual

Creates a directory at path.

Parameters

path	Absolute directory path.

Returns

Ok on success; AlreadyExists/NotFound/InvalidArgument otherwise.

Implements contur::IFileSystem.

open()

Result< FileDescriptor > contur::SimpleFS::open ( const std::string & path, OpenMode mode )

nodiscardoverridevirtual

Opens file path with requested mode.

Parameters

path	Absolute file path.
mode	Open mode flags.

Returns

File descriptor on success or error code.

Implements contur::IFileSystem.

operator=() [1/2]

SimpleFS & contur::SimpleFS::operator= ( const SimpleFS & )

delete

operator=() [2/2]

SimpleFS & contur::SimpleFS::operator= ( SimpleFS && )

noexcept

read()

Result< std::size_t > contur::SimpleFS::read ( FileDescriptor fd, std::span< std::byte > buffer )

nodiscardoverridevirtual

Reads bytes from descriptor into buffer.

Parameters

fd	Open descriptor.
buffer	Destination buffer.

Returns

Number of bytes read or error code.

Implements contur::IFileSystem.

remove()

Result< void > contur::SimpleFS::remove ( const std::string & path )

nodiscardoverridevirtual

Removes file or empty directory at path.

Parameters

path	Absolute path.

Returns

Ok on success; NotFound/InvalidState/PermissionDenied otherwise.

Implements contur::IFileSystem.

stat()

Result< InodeInfo > contur::SimpleFS::stat ( const std::string & path ) const

nodiscardoverridevirtual

Returns metadata for path.

Parameters

path	Absolute file or directory path.

Returns

Metadata on success; NotFound otherwise.

Implements contur::IFileSystem.

write()

Result< std::size_t > contur::SimpleFS::write ( FileDescriptor fd, std::span< const std::byte > data )

nodiscardoverridevirtual

Writes bytes from data into descriptor stream.

Parameters

fd	Open descriptor.
data	Source bytes.

Returns

Number of bytes written or error code.

Implements contur::IFileSystem.

Member Data Documentation

impl_

std::unique_ptr<Impl> contur::SimpleFS::impl_

private

Definition at line 76 of file simple_fs.h.

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

• include/contur/fs/simple_fs.h