rofs.c File Reference

The operations of a read-only filesystem that would change it: each fails with EROFS. More...

#include <core/system.h>
#include <fs/vfs.h>
#include <fs/rofs.h>

Go to the source code of this file.

Functions
ssize_t	rofs_write (struct vnode *vnode, off_t offset, struct iobuf *io)
	Refuses a write to a read-only filesystem.
int	rofs_trunc (struct vnode *vnode, off_t len)
	Refuses to truncate a file on a read-only filesystem.
int	rofs_vmknod (struct vnode *dir, const char *fn, uint32_t mode, dev_t dev, struct uio *uio, struct vnode **ref)
	Refuses to make a node on a read-only filesystem.
int	rofs_vunlink (struct vnode *dir, const char *fn, struct uio *uio)
	Refuses to remove a name from a read-only filesystem.
int	rofs_vlink (struct vnode *dir, const char *fn, struct vnode *vnode, struct uio *uio)
	Refuses to make a hard link on a read-only filesystem.
int	rofs_vrename (struct vnode *odir, const char *ofn, struct vnode *ndir, const char *nfn, struct uio *uio)
	Refuses to rename on a read-only filesystem.
int	rofs_setattr (struct vnode *vnode)
	Refuses to change a node's attributes on a read-only filesystem.

Detailed Description

The operations of a read-only filesystem that would change it: each fails with EROFS.

A read-only filesystem (initramfs) uses them in its table of vnode operations.

Definition in file rofs.c.

Function Documentation

rofs_setattr()

int rofs_setattr

(

struct vnode *

vnode

)

Refuses to change a node's attributes on a read-only filesystem.

Parameters

vnode

the node

Returns

-EROFS

Definition at line 100 of file rofs.c.

References rofs_setattr().

Referenced by rofs_setattr().

rofs_trunc()

int rofs_trunc	(	struct vnode *	vnode,
		off_t	len )

Refuses to truncate a file on a read-only filesystem.

Parameters

vnode	the file
len	the length asked for

Returns

-EROFS

Definition at line 31 of file rofs.c.

References rofs_trunc().

Referenced by rofs_trunc().

rofs_vlink()

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

Refuses to make a hard link on a read-only filesystem.

Parameters

dir	the directory
fn	the new name
vnode	the file to link
uio	who is asking

Returns

-EROFS

Definition at line 74 of file rofs.c.

References rofs_vlink().

Referenced by rofs_vlink().

rofs_vmknod()

int rofs_vmknod	(	struct vnode *	dir,
		const char *	fn,
		uint32_t	mode,
		dev_t	dev,
		struct uio *	uio,
		struct vnode **	ref )

Refuses to make a node on a read-only filesystem.

Parameters

dir	the directory
fn	the new node's name
mode	its type and permissions
dev	its device number
uio	who is asking
ref	not set

Returns

-EROFS

Definition at line 47 of file rofs.c.

References rofs_vmknod().

Referenced by rofs_vmknod().

rofs_vrename()

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

Refuses to rename on a read-only filesystem.

Parameters

odir	the old directory
ofn	the old name
ndir	the new directory
nfn	the new name
uio	who is asking

Returns

-EROFS

Definition at line 89 of file rofs.c.

References rofs_vrename().

Referenced by rofs_vrename().

rofs_vunlink()

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

Refuses to remove a name from a read-only filesystem.

Parameters

dir	the directory
fn	the name
uio	who is asking

Returns

-EROFS

Definition at line 60 of file rofs.c.

References rofs_vunlink().

Referenced by rofs_vunlink().

rofs_write()

ssize_t rofs_write	(	struct vnode *	vnode,
		off_t	offset,
		struct iobuf *	io )

Refuses a write to a read-only filesystem.

Parameters

vnode	the file
offset	where the write would be
io	the data

Returns

-EROFS

Definition at line 19 of file rofs.c.

References rofs_write().

Referenced by rofs_write().