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->lower_path.mnt has the same value for all dentries on given ecryptfs instance and if somebody goes for mountpoint-crossing variant where that would not be true, we can deal with that when it happens (and _not_ with duplicating these reference into each dentry). As it is, we are better off just sticking a reference into ecryptfs-private part of superblock and keeping it pinned until ->kill_sb(). That way we can stick a reference to underlying dentry right into ->d_fsdata of ecryptfs one, getting rid of indirection through struct ecryptfs_dentry_info, along with the entire struct ecryptfs_dentry_info machinery. [kudos to Dan Carpenter for spotting a bug in ecryptfs_get_tree() part] Reviewed-by: Christian Brauner <brauner@kernel.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
76 lines
2 KiB
C
76 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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* @dir: inode of expected parent
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* @name: expected name
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* @dentry: dentry to revalidate
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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 inode *dir, const struct qstr *name,
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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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struct inode *lower_dir = ecryptfs_inode_to_lower(dir);
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struct name_snapshot n;
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take_dentry_name_snapshot(&n, lower_dentry);
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rc = lower_dentry->d_op->d_revalidate(lower_dir, &n.name,
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lower_dentry, flags);
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release_dentry_name_snapshot(&n);
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}
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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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/**
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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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dput(dentry->d_fsdata);
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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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