https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: df0cc57e057f18e44dac8e6c18aba47ab53202f9 authored by Linus Torvalds on 09 January 2022, 22:55:34 UTC
Linux 5.16
Linux 5.16
Tip revision: df0cc57
dentry.c
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* eCryptfs: Linux filesystem encryption layer
*
* Copyright (C) 1997-2003 Erez Zadok
* Copyright (C) 2001-2003 Stony Brook University
* Copyright (C) 2004-2006 International Business Machines Corp.
* Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
*/
#include <linux/dcache.h>
#include <linux/namei.h>
#include <linux/mount.h>
#include <linux/fs_stack.h>
#include <linux/slab.h>
#include "ecryptfs_kernel.h"
/**
* ecryptfs_d_revalidate - revalidate an ecryptfs dentry
* @dentry: The ecryptfs dentry
* @flags: lookup flags
*
* Called when the VFS needs to revalidate a dentry. This
* is called whenever a name lookup finds a dentry in the
* dcache. Most filesystems leave this as NULL, because all their
* dentries in the dcache are valid.
*
* Returns 1 if valid, 0 otherwise.
*
*/
static int ecryptfs_d_revalidate(struct dentry *dentry, unsigned int flags)
{
struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
int rc = 1;
if (flags & LOOKUP_RCU)
return -ECHILD;
if (lower_dentry->d_flags & DCACHE_OP_REVALIDATE)
rc = lower_dentry->d_op->d_revalidate(lower_dentry, flags);
if (d_really_is_positive(dentry)) {
struct inode *inode = d_inode(dentry);
fsstack_copy_attr_all(inode, ecryptfs_inode_to_lower(inode));
if (!inode->i_nlink)
return 0;
}
return rc;
}
struct kmem_cache *ecryptfs_dentry_info_cache;
static void ecryptfs_dentry_free_rcu(struct rcu_head *head)
{
kmem_cache_free(ecryptfs_dentry_info_cache,
container_of(head, struct ecryptfs_dentry_info, rcu));
}
/**
* ecryptfs_d_release
* @dentry: The ecryptfs dentry
*
* Called when a dentry is really deallocated.
*/
static void ecryptfs_d_release(struct dentry *dentry)
{
struct ecryptfs_dentry_info *p = dentry->d_fsdata;
if (p) {
path_put(&p->lower_path);
call_rcu(&p->rcu, ecryptfs_dentry_free_rcu);
}
}
const struct dentry_operations ecryptfs_dops = {
.d_revalidate = ecryptfs_d_revalidate,
.d_release = ecryptfs_d_release,
};