Virtual nodes

Collaboration diagram for Virtual nodes:

Data Structures
struct	vnode_operations
	Vector table for operations performed on a single virtual node. More...
struct	vnode
	represents a single virtual node More...

Enumerations
enum	vnode_type {   VNODE_FIFO = S_IFIFO , VNODE_CHARDEVICE = S_IFCHR , VNODE_DIRECTORY = S_IFDIR , VNODE_BLOCKDEVICE = S_IFBLK ,   VNODE_FILE = S_IFREG , VNODE_SYMLINK = S_IFLNK , VNODE_SOCKET = S_IFSOCK }
	The different existing types of vnodes. More...

Functions
vnode_t *	vfs_vnode_acquire (vnode_t *, bool *)
	Increment the refcount of a vnode. More...
vnode_t *	vfs_vnode_release (vnode_t *)
	Decrease the refcount of a vnode. More...

Detailed Description

Enumeration Type Documentation

vnode_type

enum typedef enum vnode_type vnode_type

Enumerator
VNODE_FIFO	FIFO.
VNODE_CHARDEVICE	Character device.
VNODE_DIRECTORY	Regular directory.
VNODE_BLOCKDEVICE	Block device.
VNODE_FILE	Regular file.
VNODE_SYMLINK	Symbolic link.
VNODE_SOCKET	Socket file.

Function Documentation

vfs_vnode_acquire()

vnode_t * vfs_vnode_acquire	(	vnode_t *	node,
		bool *	new
	)

Similarily to any other synchronization mechanism, you must call vfs_vnode_release once you are done using this node

Parameters

	vnode	The referenced vnode
[out]	new	Set to true if a new vnode was created (optional)

Returns

The original vnode, or a newly allocated one if NULL

vfs_vnode_release()

vnode_t * vfs_vnode_release

(

vnode_t *

node

)

Warning

The vnode is free'd if the new refcount is 0

Returns

The original vnode, NULL if the new refcount is 0