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/** @file
*
* vboxsf -- VirtualBox Guest Additions for Linux:
* Operations for symbolic links.
*/
/*
* Copyright (C) 2010-2011 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*/
#include "vfsmod.h"
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0)
static void *sf_follow_link(struct dentry *dentry, struct nameidata *nd)
{
struct inode *inode = dentry->d_inode;
struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
struct sf_inode_info *sf_i = GET_INODE_INFO(inode);
int error = -ENOMEM;
char *path = (char*)get_zeroed_page(GFP_KERNEL);
int rc;
if (path)
{
error = 0;
rc = vboxReadLink(&client_handle, &sf_g->map, sf_i->path, PATH_MAX, path);
if (RT_FAILURE(rc))
{
LogFunc(("vboxReadLink failed, caller=%s, rc=%Rrc\n", __func__, rc));
free_page((unsigned long)path);
error = -EPROTO;
}
}
nd_set_link(nd, error ? ERR_PTR(error) : path);
return NULL;
}
static void sf_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie)
{
char *page = nd_get_link(nd);
if (!IS_ERR(page))
free_page((unsigned long)page);
}
struct inode_operations sf_lnk_iops =
{
.readlink = generic_readlink,
.follow_link = sf_follow_link,
.put_link = sf_put_link
};
#endif
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