1a59d1b8e0
Based on 1 normalized pattern(s): 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 either version 2 of the license or at your option any 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 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
79 lines
2 KiB
C
79 lines
2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/**
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* eCryptfs: Linux filesystem encryption layer
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*
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* Copyright (C) 1997-2003 Erez Zadok
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* Copyright (C) 2001-2003 Stony Brook University
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* Copyright (C) 2004-2006 International Business Machines Corp.
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* Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
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*/
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#include <linux/dcache.h>
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#include <linux/namei.h>
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#include <linux/mount.h>
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#include <linux/fs_stack.h>
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#include <linux/slab.h>
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#include "ecryptfs_kernel.h"
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/**
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* ecryptfs_d_revalidate - revalidate an ecryptfs dentry
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* @dentry: The ecryptfs dentry
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* @flags: lookup flags
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*
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* Called when the VFS needs to revalidate a dentry. This
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* is called whenever a name lookup finds a dentry in the
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* dcache. Most filesystems leave this as NULL, because all their
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* dentries in the dcache are valid.
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*
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* Returns 1 if valid, 0 otherwise.
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*
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*/
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static int ecryptfs_d_revalidate(struct dentry *dentry, unsigned int flags)
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{
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struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
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int rc = 1;
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if (flags & LOOKUP_RCU)
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return -ECHILD;
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if (lower_dentry->d_flags & DCACHE_OP_REVALIDATE)
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rc = lower_dentry->d_op->d_revalidate(lower_dentry, flags);
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if (d_really_is_positive(dentry)) {
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struct inode *inode = d_inode(dentry);
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fsstack_copy_attr_all(inode, ecryptfs_inode_to_lower(inode));
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if (!inode->i_nlink)
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return 0;
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}
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return rc;
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}
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struct kmem_cache *ecryptfs_dentry_info_cache;
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static void ecryptfs_dentry_free_rcu(struct rcu_head *head)
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{
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kmem_cache_free(ecryptfs_dentry_info_cache,
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container_of(head, struct ecryptfs_dentry_info, rcu));
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}
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/**
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* ecryptfs_d_release
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* @dentry: The ecryptfs dentry
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*
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* Called when a dentry is really deallocated.
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*/
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static void ecryptfs_d_release(struct dentry *dentry)
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{
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struct ecryptfs_dentry_info *p = dentry->d_fsdata;
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if (p) {
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path_put(&p->lower_path);
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call_rcu(&p->rcu, ecryptfs_dentry_free_rcu);
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}
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}
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const struct dentry_operations ecryptfs_dops = {
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.d_revalidate = ecryptfs_d_revalidate,
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.d_release = ecryptfs_d_release,
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};
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