linux/fs/ecryptfs/super.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 <[email protected]>
 *              Michael C. Thompson <[email protected]>
 */

#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/key.h>
#include <linux/slab.h>
#include <linux/seq_file.h>
#include <linux/file.h>
#include <linux/statfs.h>
#include <linux/magic.h>
#include "ecryptfs_kernel.h"

struct kmem_cache *ecryptfs_inode_info_cache;

/**
 * ecryptfs_alloc_inode - allocate an ecryptfs inode
 * @sb: Pointer to the ecryptfs super block
 *
 * Called to bring an inode into existence.
 *
 * Only handle allocation, setting up structures should be done in
 * ecryptfs_read_inode. This is because the kernel, between now and
 * then, will 0 out the private data pointer.
 *
 * Returns a pointer to a newly allocated inode, NULL otherwise
 */
static struct inode *ecryptfs_alloc_inode(struct super_block *sb)
{ … }

static void ecryptfs_free_inode(struct inode *inode)
{ … }

/**
 * ecryptfs_destroy_inode
 * @inode: The ecryptfs inode
 *
 * This is used during the final destruction of the inode.  All
 * allocation of memory related to the inode, including allocated
 * memory in the crypt_stat struct, will be released here.
 * There should be no chance that this deallocation will be missed.
 */
static void ecryptfs_destroy_inode(struct inode *inode)
{ … }

/**
 * ecryptfs_statfs
 * @dentry: The ecryptfs dentry
 * @buf: The struct kstatfs to fill in with stats
 *
 * Get the filesystem statistics. Currently, we let this pass right through
 * to the lower filesystem and take no action ourselves.
 */
static int ecryptfs_statfs(struct dentry *dentry, struct kstatfs *buf)
{ … }

/**
 * ecryptfs_evict_inode
 * @inode: The ecryptfs inode
 *
 * Called by iput() when the inode reference count reached zero
 * and the inode is not hashed anywhere.  Used to clear anything
 * that needs to be, before the inode is completely destroyed and put
 * on the inode free list. We use this to drop out reference to the
 * lower inode.
 */
static void ecryptfs_evict_inode(struct inode *inode)
{ … }

/*
 * ecryptfs_show_options
 *
 * Prints the mount options for a given superblock.
 * Returns zero; does not fail.
 */
static int ecryptfs_show_options(struct seq_file *m, struct dentry *root)
{ … }

const struct super_operations ecryptfs_sops = …;