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- // 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,
- };
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