Virtual filesystem

Collaboration diagram for Virtual filesystem:

Data Structures
struct	vfs_operations
	Vector Table for operations on a filesystems. More...
struct	vfs
	represents a single virtual filesystem More...

Functions
error_t	vfs_mount (const char *path, const char *fs_type, struct block_device *)
	Mount a filesystem of the given type at a given path. More...
error_t	vfs_mount_root (const char *fs_type, struct block_device *)
	Mount a filesystem at the root of the VFS. More...
error_t	vfs_unmount (const char *path)
	Unmount the filesystem present at the given path. More...
vnode_t *	vfs_find_by_path (const char *path)
	Retreive the vnode corresponding to a path. More...
vnode_t *	vfs_create (const char *path, vnode_type type)
	Create a new file at the given path. More...
error_t	vfs_remove (const char *path)
	Remove the file located at the given path. More...
struct file *	vfs_open (const char *path, int oflags)
	Open the file located at the given path. More...

Detailed Description

Function Documentation

vfs_create()

vnode_t * vfs_create	(	const char *	path,
		vnode_type	type
	)

Parameters

path	The path of the new child
type	The type of the new file

Returns

The created vnode, or a pointer-encoded error:

• E_NOENT - Path is invalid
• E_EXIST - File already exists

vfs_find_by_path()

vnode_t * vfs_find_by_path

(

const char *

path

)

Warning

The vnode returned by this function must be released using vfs_vnode_release once done with it

Returns

The vnode, or a pointer containing the error number:

• E_NOENT - Path does not exist

vfs_mount()

error_t vfs_mount	(	const char *	path,
		const char *	fs_type,
		struct block_device *	blkdev
	)

Parameters

path	Where the fs should be mounted (must be an existing directory)
fs_type	The name of the filesystem to mount
block_device	The block device the filesystem resides on

Returns

• E_INVAL - the filesystem does not exist
• E_INVAL - the path does not lead to a directory
• E_INVAL - another filesystem is mounted at the requested path
• E_NOENT - the path is invalid

vfs_mount_root()

error_t vfs_mount_root	(	const char *	fs_type,
		struct block_device *	blkdev
	)

Parameters

fs_type	The type of the filesystem
block_device	The block device the filesystem resides on

Returns

• E_INVAL - there already is a root for the VFS
• E_INVAL - the filesystem does not exist

vfs_open()

struct file * vfs_open	(	const char *	path,
		int	oflags
	)

Parameters

path	Absolute path to the file
oflags	Same flags as those passed to the open() syscal (O_*)

Returns

The file's struct, or a pointer encoded error

vfs_remove()

error_t vfs_remove

(

const char *

path

)

Returns

E_NOENT if the file does not exist

vfs_unmount()

error_t vfs_unmount

(

const char *

path

)

Returns

• E_INVAL - No file system mounted on the given path