Public Member Functions
	FileSystem (bool format)
	FileSystem::FileSystem Initialize the file system. If format = TRUE, the disk has nothing on it, and we need to initialize the disk to contain an empty directory, and a bitmap of free sectors (with almost but not all of the sectors marked as free). More...

	~FileSystem ()
	~FileSystem() delete all file system

bool	Create (const char *name, int initialSize, File_type type=f)
	FileSystem::Create Create a file in the Nachos file system (similar to UNIX create). Since we can't increase the size of files dynamically, we have to give Create the initial size of the file. More...

bool	MkDir (const char *directory_name, unsigned int tid=0)
	FileSystem::MkDir Create a new folder in the Nachos file system. More...

bool	CdDir (const char *directory_name, unsigned int tid=0)
	FileSystem::CdDir Come in folder given. More...

bool	RmDir (const char *directory_name, unsigned int tid=0)
	FileSystem::RmDir Remove the folder given. More...

path_parse_t *	CdFromPathName (const char *path_name, unsigned int tid=0, int truncate=0)
	FileSystem::CdFromPathName can jump into the directory with a path. More...

OpenFile *	OpenFromPathName (const char *path_name, unsigned int tid=0)
	FileSystem::OpenFromPathName. More...

bool	MkdirFromPathName (const char *path_name, unsigned int tid=0)
	FileSystem::MkdirFromPathName. More...

bool	RmdirFromPathName (const char *path_name, unsigned int tid=0)

OpenFile *	Open (const char *name, unsigned int tid=0)
	FileSystem::Open Open a file for reading and writing. To open a file: Find the location of the file's header, using the directory Bring the header into memory. More...

bool	Remove (const char *name, unsigned int tid=0)
	FileSystem::Remove Delete a file from the file system. This requires: Remove it from the directory Delete the space for its header Delete the space for its data blocks Write changes to directory, bitmap back to disk. More...

void	List ()
	FileSystem::List List all the files in the file system directory.

void	Print ()
	FileSystem::Print Print everything about the file system: the contents of the bitmap the contents of the directory for each file in the directory, the contents of the file header the data in the file.

void	registerOpenFileTable (int *table, unsigned int tid)
	Allow a thread to use filesystem by register his tid. More...

bool	unregisterOpenFileTable (unsigned int tid)
	When thread die need to call this method. More...

int	UserOpen (const char *name, unsigned int tid)
	allow a user to open a file More...

int	UserRead (int fileDescriptor, char *into, int numBytes, unsigned int tid)
	allow user to read into file More...

int	UserWrite (int fileDescriptor, char *from, int numBytes, unsigned int tid)
	Allow user to write into a file. More...

void	UserSetSeek (int fileDescriptor, int position, unsigned int tid)
	User method that allow user to move the seek into a file. More...

int	UserCloseFile (int fileDescriptor, int *threadTableFileDescriptor, unsigned int tid)

Constructor & Destructor Documentation

FileSystem::FileSystem ( bool format )

FileSystem::FileSystem Initialize the file system. If format = TRUE, the disk has nothing on it, and we need to initialize the disk to contain an empty directory, and a bitmap of free sectors (with almost but not all of the sectors marked as free).

If format = FALSE, we just have to open the files representing the bitmap and the directory.

Parameters

format – should we initialize the disk?

Member Function Documentation

bool FileSystem::CdDir	(	const char *	directory_name,
		unsigned int	tid = `0`
	)

FileSystem::CdDir Come in folder given.

Returns: Return TRUE if everything goes ok, otherwise, return FALSE.

Parameters

name	– name of folder to come in

path_parse_t * FileSystem::CdFromPathName	(	const char *	path_name,
		unsigned int	tid = `0`,
		int	truncate = `0`
	)

FileSystem::CdFromPathName can jump into the directory with a path.

Parameters

path_name the path name

Returns

bool FileSystem::Create	(	const char *	name,
		int	initialSize,
		File_type	type = `f`
	)

FileSystem::Create Create a file in the Nachos file system (similar to UNIX create). Since we can't increase the size of files dynamically, we have to give Create the initial size of the file.

The steps to create a file are: Make sure the file doesn't already exist Allocate a sector for the file header Allocate space on disk for the data blocks for the file Add the name to the directory Store the new file header on disk Flush the changes to the bitmap and the directory back to disk

Returns: Return TRUE if everything goes ok, otherwise, return FALSE.

Create fails if: file is already in directory no free space for file header no free entry for file in directory no free space for data blocks for the file

Note that this implementation assumes there is no concurrent access to the file system!

Parameters

name	– name of file to be created
initialSize	– size of file to be created

bool FileSystem::MkDir	(	const char *	directory_name,
		unsigned int	tid = `0`
	)

FileSystem::MkDir Create a new folder in the Nachos file system.

Returns: Return TRUE if everything goes ok, otherwise, return FALSE.

Parameters

name	– name of folder to be created

bool FileSystem::MkdirFromPathName	(	const char *	path_name,
		unsigned int	tid = `0`
	)

FileSystem::MkdirFromPathName.

Parameters

path_name
tid

Returns

OpenFile * FileSystem::Open	(	const char *	name,
		unsigned int	tid = `0`
	)

FileSystem::Open Open a file for reading and writing. To open a file: Find the location of the file's header, using the directory Bring the header into memory.

Parameters

name	– the text name of the file to be opened

Returns: openfile, or NULL if error

OpenFile * FileSystem::OpenFromPathName	(	const char *	path_name,
		unsigned int	tid = `0`
	)

FileSystem::OpenFromPathName.

Parameters

path_name
tid

Returns: openFile pointer of te file opened, null if no success

void FileSystem::registerOpenFileTable	(	int *	table,
		unsigned int	tid
	)

Allow a thread to use filesystem by register his tid.

Parameters

table
tid

bool FileSystem::Remove	(	const char *	name,
		unsigned int	tid = `0`
	)

FileSystem::Remove Delete a file from the file system. This requires: Remove it from the directory Delete the space for its header Delete the space for its data blocks Write changes to directory, bitmap back to disk.

Returns: Return TRUE if the file was deleted, FALSE if the file wasn't in the file system.

Parameters

name	– the text name of the file to be removed

bool FileSystem::RmDir	(	const char *	directory_name,
		unsigned int	tid = `0`
	)

FileSystem::RmDir Remove the folder given.

Returns: Return TRUE if everything goes ok, otherwise, return FALSE.

Parameters

name	– name of folder to be removed

bool FileSystem::RmdirFromPathName	(	const char *	path_name,
		unsigned int	tid = `0`
	)

Parameters

path_name
tid

Returns

bool FileSystem::unregisterOpenFileTable ( unsigned int tid )

When thread die need to call this method.

Parameters

tid	the tid of the thread

Returns: false if an error occur, otherwise true

int FileSystem::UserOpen	(	const char *	name,
		unsigned int	tid
	)

allow a user to open a file

Methode for User Syscall

Parameters

name
tid

Returns: a file descritptor

int FileSystem::UserRead	(	int	fileDescriptor,
		char *	into,
		int	numBytes,
		unsigned int	tid
	)

allow user to read into file

Parameters

fileDescriptor
into
numBytes
tid

Returns

void FileSystem::UserSetSeek	(	int	fileDescriptor,
		int	position,
		unsigned int	tid
	)

User method that allow user to move the seek into a file.

Parameters

fileDescriptor
position
tid

int FileSystem::UserWrite	(	int	fileDescriptor,
		char *	from,
		int	numBytes,
		unsigned int	tid
	)

Allow user to write into a file.

Parameters

fileDescriptor
from
numBytes
tid

Returns

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

code/filesys/filesys.h
code/filesys/filesys.cc

Public Member Functions

Constructor & Destructor Documentation

Member Function Documentation