directory_operations_bsfs.c File Reference

Implementation of high-level directory operations for BSFS. More...

Functions
int	create_directory (FILE *disk, superblock_t *sb, const char *path, dir_t *cwd)
	Creates a new directory at the given path.
int	remove_directory (FILE *disk, superblock_t *sb, const char *path, dir_t *cwd)
	Deletes a directory at the given path, if it is empty.
int	move_dir_entry (FILE *disk, superblock_t *sb, dir_t *src_dir, const char *src_name, dir_t *dest_dir, const char *dest_name)
	Moves or renames a directory entry from one directory to another.
int	create_root_directory (FILE *disk, superblock_t *sb)
	Initialize and persist the root directory ("/") on a fresh image.

Detailed Description

Implementation of high-level directory operations for BSFS.

This module handles directory creation, deletion, and movement of files and subdirectories between parent directories. It relies on directory entry manipulation and inode handling provided by supporting modules.

Function Documentation

create_directory()

int create_directory	(	FILE *	disk,
		superblock_t *	sb,
		const char *	path,
		dir_t *	cwd )

Creates a new directory at the given path.

This function allocates a new inode of type directory and inserts it as an entry into the parent directory determined by the path.

Parameters

disk	Pointer to the disk file.
sb	Pointer to the loaded superblock.
path	Absolute or relative path for the new directory.
cwd	Current working directory (for resolving relative paths).

Returns

0 on success, -1 on error.

create_root_directory()

int create_root_directory	(	FILE *	disk,
		superblock_t *	sb )

Initialize and persist the root directory ("/") on a fresh image.

Creates the root inode with default ownership and permissions, allocates a directory B-tree for entries, inserts the mandatory "." and ".." entries, and ensures the inode tree contains the root inode.

Parameters

disk	Open filesystem image.
sb	Loaded superblock (root inode and tree roots may be updated).

Returns

0 on success; -1 on error.

move_dir_entry()

int move_dir_entry	(	FILE *	disk,
		superblock_t *	sb,
		dir_t *	src_dir,
		const char *	src_name,
		dir_t *	dest_dir,
		const char *	dest_name )

Moves or renames a directory entry from one directory to another.

This function removes an existing directory entry from the source directory and inserts it into the destination directory. The entry can also be renamed in the process.

Parameters

disk	Pointer to the disk file.
sb	Pointer to the superblock.
src_dir	Pointer to the source directory.
src_name	Name of the entry to move (existing name).
dest_dir	Pointer to the destination directory.
dest_name	New name for the entry in the destination (can be same as src_name).

Returns

0 on success, -1 on failure.

remove_directory()

int remove_directory	(	FILE *	disk,
		superblock_t *	sb,
		const char *	path,
		dir_t *	cwd )

Deletes a directory at the given path, if it is empty.

This function removes the directory entry and deallocates the associated inode.

Parameters

disk	Pointer to the disk file.
sb	Pointer to the loaded superblock.
path	Absolute or relative path of the directory to remove.
cwd	Current working directory (for resolving relative paths).

Returns

0 on success, -1 if the directory is not empty or cannot be removed.