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/* $Id: lnkops.c $ */
/** @file
* vboxsf - VBox Linux Shared Folders VFS, operations for symbolic links.
*/
/*
* Copyright (C) 2010-2019 Oracle Corporation
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include "vfsmod.h"
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0)
# if LINUX_VERSION_CODE < KERNEL_VERSION(4, 5, 0)
# if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0)
static const char *sf_follow_link(struct dentry *dentry, void **cookie)
# else
static void *sf_follow_link(struct dentry *dentry, struct nameidata *nd)
# endif
{
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 = VbglR0SfReadLink(&client_handle, &sf_g->map, sf_i->path,
PATH_MAX, path);
if (RT_FAILURE(rc)) {
LogFunc(("VbglR0SfReadLink failed, caller=%s, rc=%Rrc\n", __func__, rc));
free_page((unsigned long)path);
error = -EPROTO;
}
}
# if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0)
return error ? ERR_PTR(error) : (*cookie = path);
# else
nd_set_link(nd, error ? ERR_PTR(error) : path);
return NULL;
# endif
}
# if LINUX_VERSION_CODE < KERNEL_VERSION(4, 2, 0)
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);
}
# endif
# else /* LINUX_VERSION_CODE >= 4.5.0 */
static const char *sf_get_link(struct dentry *dentry, struct inode *inode,
struct delayed_call *done)
{
struct sf_glob_info *sf_g = GET_GLOB_INFO(inode->i_sb);
struct sf_inode_info *sf_i = GET_INODE_INFO(inode);
char *path;
int rc;
if (!dentry)
return ERR_PTR(-ECHILD);
path = kzalloc(PAGE_SIZE, GFP_KERNEL);
if (!path)
return ERR_PTR(-ENOMEM);
rc = VbglR0SfReadLink(&client_handle, &sf_g->map, sf_i->path, PATH_MAX,
path);
if (RT_FAILURE(rc)) {
LogFunc(("VbglR0SfReadLink failed, caller=%s, rc=%Rrc\n",
__func__, rc));
kfree(path);
return ERR_PTR(-EPROTO);
}
set_delayed_call(done, kfree_link, path);
return path;
}
# endif /* LINUX_VERSION_CODE >= 4.5.0 */
struct inode_operations sf_lnk_iops = {
# if LINUX_VERSION_CODE < KERNEL_VERSION(4, 10, 0)
.readlink = generic_readlink,
# endif
# if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 5, 0)
.get_link = sf_get_link
# elif LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0)
.follow_link = sf_follow_link,
.put_link = free_page_put_link,
# else
.follow_link = sf_follow_link,
.put_link = sf_put_link
# endif
};
#endif /* LINUX_VERSION_CODE >= 2.6.0 */
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