linux/fs/ecryptfs/kthread.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * eCryptfs: Linux filesystem encryption layer
 *
 * Copyright (C) 2008 International Business Machines Corp.
 *   Author(s): Michael A. Halcrow <[email protected]>
 */

#include <linux/kthread.h>
#include <linux/freezer.h>
#include <linux/slab.h>
#include <linux/wait.h>
#include <linux/mount.h>
#include "ecryptfs_kernel.h"

struct ecryptfs_open_req { … };

static struct ecryptfs_kthread_ctl { … } ecryptfs_kthread_ctl;

static struct task_struct *ecryptfs_kthread;

/**
 * ecryptfs_threadfn
 * @ignored: ignored
 *
 * The eCryptfs kernel thread that has the responsibility of getting
 * the lower file with RW permissions.
 *
 * Returns zero on success; non-zero otherwise
 */
static int ecryptfs_threadfn(void *ignored)
{ … }

int __init ecryptfs_init_kthread(void)
{ … }

void ecryptfs_destroy_kthread(void)
{ … }

/**
 * ecryptfs_privileged_open
 * @lower_file: Result of dentry_open by root on lower dentry
 * @lower_dentry: Lower dentry for file to open
 * @lower_mnt: Lower vfsmount for file to open
 * @cred: credential to use for this call
 *
 * This function gets a r/w file opened against the lower dentry.
 *
 * Returns zero on success; non-zero otherwise
 */
int ecryptfs_privileged_open(struct file **lower_file,
			     struct dentry *lower_dentry,
			     struct vfsmount *lower_mnt,
			     const struct cred *cred)
{ … }