pseudofs: the directories of the filesystems that live in memory (tmpfs, and so devfs and devpts). More...

#include <core/system.h>
#include <core/time.h>
#include <fs/pseudofs.h>

Functions
static void	pseudofs_dirent_name (struct dirent dirent, const char name)
	Copies an entry's name into a struct dirent, cut to fit.
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.
static struct pseudofs_dirent *	entry_find (struct vnode dir, const char fn, struct pseudofs_dirent **prev)
	Finds the entry fn of directory dir, and the entry before it in *prev (NULL if it's the first).
static void	entry_remove (struct vnode dir, struct pseudofs_dirent entry, struct pseudofs_dirent *prev)
	Removes entry (which comes after prev) from directory dir, and drops a link to its vnode, which is freed if nothing references it.
int	pseudofs_vunlink (struct vnode vnode, 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.

Variables
static const char	dotdot [] = ".."

Detailed Description

pseudofs: the directories of the filesystems that live in memory (tmpfs, and so devfs and devpts).

A directory is a list of its entries, each a name and the entry's vnode, which is also its inode (its inode number is its address).

Definition in file pseudofs.c.

Function Documentation

◆ entry_find()

struct pseudofs_dirent * entry_find	(	struct vnode *	dir,
		const char *	fn,
		struct pseudofs_dirent **	prev )

static

Finds the entry fn of directory dir, and the entry before it in *prev (NULL if it's the first).

Returns NULL if there's none.

Definition at line 134 of file pseudofs.c.

References entry_find(), NULL, and vnode::p.

Referenced by entry_find(), pseudofs_vlink(), pseudofs_vrename(), and pseudofs_vunlink().

◆ entry_remove()

void entry_remove	(	struct vnode *	dir,
		struct pseudofs_dirent *	entry,
		struct pseudofs_dirent *	prev )

static

Removes entry (which comes after prev) from directory dir, and drops a link to its vnode, which is freed if nothing references it.

Definition at line 150 of file pseudofs.c.

References pseudofs_dirent::d_ino, pseudofs_dirent::d_name, entry_remove(), kfree(), vnode::mode, pseudofs_dirent::next, vnode::nlink, vnode::p, vnode::ref, and vfs_close().

Referenced by entry_remove(), pseudofs_vrename(), and pseudofs_vunlink().

◆ 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_dirent_name()

void pseudofs_dirent_name	(	struct dirent *	dirent,
		const char *	name )

static

Copies an entry's name into a struct dirent, cut to fit.

Definition at line 26 of file pseudofs.c.

References memcpy(), and pseudofs_dirent_name().

Referenced by pseudofs_dirent_name(), pseudofs_finddir(), and pseudofs_readdir().

◆ 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().

Variable Documentation

◆ dotdot

const char dotdot[] = ".."

static

Definition at line 23 of file pseudofs.c.

Functions

Variables

Detailed Description

Function Documentation

◆ entry_find()

◆ entry_remove()

◆ pseudofs_close()

◆ pseudofs_dirent_name()

◆ pseudofs_finddir()

◆ pseudofs_readdir()

◆ pseudofs_setattr()

◆ pseudofs_vlink()

◆ pseudofs_vmknod()

◆ pseudofs_vrename()

◆ pseudofs_vunlink()

Variable Documentation

◆ dotdot