| 1 | /** @file
|
|---|
| 2 | *
|
|---|
| 3 | * vboxsf -- VirtualBox Guest Additions for Linux:
|
|---|
| 4 | * Operations for symbolic links.
|
|---|
| 5 | */
|
|---|
| 6 |
|
|---|
| 7 | /*
|
|---|
| 8 | * Copyright (C) 2010-2011 Oracle Corporation
|
|---|
| 9 | *
|
|---|
| 10 | * This file is part of VirtualBox Open Source Edition (OSE), as
|
|---|
| 11 | * available from http://www.virtualbox.org. This file is free software;
|
|---|
| 12 | * you can redistribute it and/or modify it under the terms of the GNU
|
|---|
| 13 | * General Public License (GPL) as published by the Free Software
|
|---|
| 14 | * Foundation, in version 2 as it comes in the "COPYING" file of the
|
|---|
| 15 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
|
|---|
| 16 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
|
|---|
| 17 | */
|
|---|
| 18 |
|
|---|
| 19 | #include "vfsmod.h"
|
|---|
| 20 |
|
|---|
| 21 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0)
|
|---|
| 22 |
|
|---|
| 23 | static void *sf_follow_link(struct dentry *dentry, struct nameidata *nd)
|
|---|
| 24 | {
|
|---|
| 25 | struct inode *inode = dentry->d_inode;
|
|---|
| 26 | struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
|
|---|
| 27 | struct sf_inode_info *sf_i = GET_INODE_INFO(inode);
|
|---|
| 28 | int error = -ENOMEM;
|
|---|
| 29 | char *path = (char*)get_zeroed_page(GFP_KERNEL);
|
|---|
| 30 | int rc;
|
|---|
| 31 |
|
|---|
| 32 | if (path)
|
|---|
| 33 | {
|
|---|
| 34 | error = 0;
|
|---|
| 35 | rc = vboxReadLink(&client_handle, &sf_g->map, sf_i->path, PATH_MAX, path);
|
|---|
| 36 | if (RT_FAILURE(rc))
|
|---|
| 37 | {
|
|---|
| 38 | LogFunc(("vboxReadLink failed, caller=%s, rc=%Rrc\n", __func__, rc));
|
|---|
| 39 | free_page((unsigned long)path);
|
|---|
| 40 | error = -EPROTO;
|
|---|
| 41 | }
|
|---|
| 42 | }
|
|---|
| 43 | nd_set_link(nd, error ? ERR_PTR(error) : path);
|
|---|
| 44 | return NULL;
|
|---|
| 45 | }
|
|---|
| 46 |
|
|---|
| 47 | static void sf_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie)
|
|---|
| 48 | {
|
|---|
| 49 | char *page = nd_get_link(nd);
|
|---|
| 50 | if (!IS_ERR(page))
|
|---|
| 51 | free_page((unsigned long)page);
|
|---|
| 52 | }
|
|---|
| 53 |
|
|---|
| 54 | struct inode_operations sf_lnk_iops =
|
|---|
| 55 | {
|
|---|
| 56 | .readlink = generic_readlink,
|
|---|
| 57 | .follow_link = sf_follow_link,
|
|---|
| 58 | .put_link = sf_put_link
|
|---|
| 59 | };
|
|---|
| 60 |
|
|---|
| 61 | #endif
|
|---|
