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/*********************************************************
* Copyright (C) 2006 VMware, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation version 2 and no later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*********************************************************/
/*
* dentry.c --
*
* Dentry operations for the filesystem portion of the vmhgfs driver.
*/
/* Must come before any kernel header file. */
#include "driver-config.h"
#include "compat_fs.h"
#include "compat_kernel.h"
#include "compat_version.h"
#include "inode.h"
#include "module.h"
#include "vm_assert.h"
/* HGFS dentry operations. */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 75)
static int HgfsDentryRevalidate(struct dentry *dentry,
struct nameidata *nd);
#else
static int HgfsDentryRevalidate(struct dentry *dentry,
int flags);
#endif
/* HGFS dentry operations structure. */
struct dentry_operations HgfsDentryOperations = {
.d_revalidate = HgfsDentryRevalidate,
};
/*
* HGFS dentry operations.
*/
/*
*----------------------------------------------------------------------
*
* HgfsDentryRevalidate --
*
* Called by namei.c every time a dentry is looked up in the dcache
* to determine if it is still valid.
*
* If the entry is found to be invalid, namei calls dput on it and
* returns NULL, which causes a new lookup to be done in the actual
* filesystem, which in our case means that HgfsLookup is called.
*
* Results:
* Positive value if the entry IS valid.
* Zero if the entry is NOT valid.
*
* Side effects:
* None
*
*----------------------------------------------------------------------
*/
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 75)
static int
HgfsDentryRevalidate(struct dentry *dentry, // IN: Dentry to revalidate
struct nameidata *nd) // IN: Lookup flags & intent
#else
static int
HgfsDentryRevalidate(struct dentry *dentry, // IN: Dentry to revalidate
int flags) // IN: Lookup flags (e.g. LOOKUP_CONTINUE)
#endif
{
int error;
LOG(6, (KERN_DEBUG "VMware hgfs: HgfsDentryRevalidate: calling "
"HgfsRevalidate\n"));
ASSERT(dentry);
/* Just call HgfsRevaliate, which does the right thing. */
error = HgfsRevalidate(dentry);
if (error) {
LOG(4, (KERN_DEBUG "VMware hgfs: HgfsDentryRevalidate: invalid\n"));
return 0;
}
LOG(6, (KERN_DEBUG "VMware hgfs: HgfsDentryRevalidate: valid\n"));
return 1;
}
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