pseudofs.h File Reference

#include <fs/vfs.h>

Go to the source code of this file.

Data Structures
struct	pseudofs_dirent
	A directory entry, kept in memory. More...

Functions
int	pseudofs_vmknod (struct vnode *dir, const char *fn, mode_t mode, dev_t dev, struct uio *uio, struct vnode **ref)
	Makes a node in a directory: a new vnode, owned by the caller, and an entry for it.
int	pseudofs_vunlink (struct vnode *dir, const char *fn, struct uio *uio)
	Removes an entry from a directory.
int	pseudofs_vlink (struct vnode *dir, const char *fn, struct vnode *vnode, struct uio *uio)
	Adds an entry for an existing vnode (a hard link) to a directory.
int	pseudofs_vrename (struct vnode *odir, const char *ofn, struct vnode *ndir, const char *nfn, struct uio *uio)
	Renames an entry, possibly to another directory, replacing an entry at the new name.
int	pseudofs_setattr (struct vnode *vnode)
	Stores a vnode's attributes: there's nothing to do, since they only live in the vnode.
ssize_t	pseudofs_readdir (struct vnode *dir, off_t offset, struct dirent *dirent)
	Reads a directory's entry at an offset.
int	pseudofs_finddir (struct vnode *dir, const char *name, struct dirent *dirent)
	Finds the entry of a directory that has a name.
int	pseudofs_close (struct vnode *vnode)
	Frees a vnode that has no names or references left, and its cached pages.

Function Documentation

pseudofs_close()

int pseudofs_close

(

struct vnode *

vnode

)

Frees a vnode that has no names or references left, and its cached pages.

Its names belong to the directory entries, which were freed when they were removed.

Parameters

vnode

the vnode

Returns

0

Definition at line 397 of file pseudofs.c.

References kfree(), pseudofs_close(), and vnode_pages_free().

Referenced by pseudofs_close(), and tmpfs_close().

pseudofs_finddir()

int pseudofs_finddir	(	struct vnode *	dir,
		const char *	name,
		struct dirent *	dirent )

Finds the entry of a directory that has a name.

Parameters

dir	the directory
name	the name
dirent	the entry, filled in

Returns

0, -ENOENT, -ENOTDIR, or -EINVAL

Definition at line 367 of file pseudofs.c.

References vnode::mode, pseudofs_dirent::next, vnode::p, pseudofs_dirent_name(), and pseudofs_finddir().

Referenced by pseudofs_finddir(), and pseudofs_vmknod().

pseudofs_readdir()

ssize_t pseudofs_readdir	(	struct vnode *	dir,
		off_t	offset,
		struct dirent *	dirent )

Reads a directory's entry at an offset.

The entries are . and .. first, then the list's entries (except its own ..).

Parameters

dir	the directory
offset	which entry
dirent	the entry, filled in

Returns

1 if an entry was read, or 0 past the last one

Definition at line 320 of file pseudofs.c.

References dotdot(), pseudofs_dirent::next, vnode::p, pseudofs_dirent_name(), and pseudofs_readdir().

Referenced by pseudofs_readdir().

pseudofs_setattr()

int pseudofs_setattr

(

struct vnode *

vnode

)

Stores a vnode's attributes: there's nothing to do, since they only live in the vnode.

Parameters

vnode

the vnode

Returns

0

Definition at line 306 of file pseudofs.c.

References pseudofs_setattr().

Referenced by pseudofs_setattr().

pseudofs_vlink()

int pseudofs_vlink	(	struct vnode *	dir,
		const char *	fn,
		struct vnode *	vnode,
		struct uio *	uio )

Adds an entry for an existing vnode (a hard link) to a directory.

Parameters

dir	the directory
fn	the new name
vnode	the vnode
uio	who is asking

Returns

0, -EEXIST, -ENAMETOOLONG, or -ENOMEM

Definition at line 211 of file pseudofs.c.

References pseudofs_dirent::d_ino, pseudofs_dirent::d_name, entry_find(), kfree(), kmalloc(), pseudofs_dirent::next, vnode::nlink, vnode::p, and pseudofs_vlink().

Referenced by pseudofs_vlink().

pseudofs_vmknod()

int pseudofs_vmknod	(	struct vnode *	dir,
		const char *	fn,
		mode_t	mode,
		dev_t	dev,
		struct uio *	uio,
		struct vnode **	ref )

Makes a node in a directory: a new vnode, owned by the caller, and an entry for it.

A new directory gets its .. entry.

Parameters

dir	the directory
fn	the new node's name
mode	its type (S_IF*) and permissions
dev	its device number, for a device node
uio	who is asking (the owner)
ref	if not NULL, set to the new vnode

Returns

0, -EEXIST, -ENAMETOOLONG, or -ENOMEM

Definition at line 49 of file pseudofs.c.

References vnode::atime, vnode::ctime, pseudofs_dirent::d_ino, pseudofs_dirent::d_name, dotdot(), vnode::fs, gettime(), uio::gid, vnode::gid, vnode::ino, kfree(), kmalloc(), M_ZERO, vnode::mode, vnode::mtime, pseudofs_dirent::next, vnode::nlink, NULL, vnode::p, pseudofs_finddir(), pseudofs_vmknod(), vnode::rdev, vnode::size, uio::uid, and vnode::uid.

Referenced by pseudofs_vmknod().

pseudofs_vrename()

int pseudofs_vrename	(	struct vnode *	odir,
		const char *	ofn,
		struct vnode *	ndir,
		const char *	nfn,
		struct uio *	uio )

Renames an entry, possibly to another directory, replacing an entry at the new name.

The VFS has checked the replaced entry already (its type, that a directory is empty).

Parameters

odir	the directory the entry is in
ofn	its name
ndir	the directory it goes to
nfn	its new name
uio	who is asking

Returns

0, -ENOENT, -ENAMETOOLONG, or -ENOMEM

Definition at line 250 of file pseudofs.c.

References pseudofs_dirent::d_ino, pseudofs_dirent::d_name, dotdot(), entry_find(), entry_remove(), kfree(), vnode::mode, pseudofs_dirent::next, vnode::nlink, vnode::p, and pseudofs_vrename().

Referenced by pseudofs_vrename().

pseudofs_vunlink()

int pseudofs_vunlink	(	struct vnode *	vnode,
		const char *	fn,
		struct uio *	uio )

Removes an entry from a directory.

Parameters

vnode	the directory
fn	the entry's name
uio	who is asking

Returns

0, -ENOTDIR, or -ENOENT

Definition at line 186 of file pseudofs.c.

References entry_find(), entry_remove(), vnode::mode, and pseudofs_vunlink().

Referenced by pseudofs_vunlink().