trunc.c File Reference

Truncating a vnode: changing a file's length. More...

#include <core/system.h>
#include <fs/vfs.h>
#include <dev/dev.h>
#include <mm/vm.h>

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Functions
int	vfs_trunc (struct vnode *vnode, off_t len)
	Changes a file's length, through its filesystem.

Detailed Description

Truncating a vnode: changing a file's length.

Definition in file trunc.c.

Function Documentation

vfs_trunc()

int vfs_trunc	(	struct vnode *	vnode,
		off_t	len )

Changes a file's length, through its filesystem.

The file's pages in the page cache between the old end and the new one are refreshed.

Parameters

vnode	the file
len	the new length, in bytes

Returns

0, -EINVAL for a device or an invalid vnode, -ENOSYS if the filesystem can't truncate, or its error

Definition at line 19 of file trunc.c.

References vnode::fs, ISDEV, LOG_DEBUG, MAX, MIN, vnode::size, vops::trunc, vfs_trunc(), vnode_pages_update(), and fs::vops.

Referenced by posix_file_trunc(), and vfs_trunc().