1// SPDX-License-Identifier: GPL-2.0-or-later
  2/* Network filesystem caching backend to use cache files on a premounted
  3 * filesystem
  4 *
  5 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
  6 * Written by David Howells (dhowells@redhat.com)
 
 
 
 
 
  7 */
  8
  9#include <linux/module.h>
 10#include <linux/init.h>
 11#include <linux/sched.h>
 12#include <linux/completion.h>
 13#include <linux/slab.h>
 14#include <linux/fs.h>
 15#include <linux/file.h>
 16#include <linux/namei.h>
 17#include <linux/mount.h>
 18#include <linux/statfs.h>
 19#include <linux/sysctl.h>
 20#include <linux/miscdevice.h>
 21#define CREATE_TRACE_POINTS
 22#include "internal.h"
 23
 24unsigned cachefiles_debug;
 25module_param_named(debug, cachefiles_debug, uint, S_IWUSR | S_IRUGO);
 26MODULE_PARM_DESC(cachefiles_debug, "CacheFiles debugging mask");
 27
 28MODULE_DESCRIPTION("Mounted-filesystem based cache");
 29MODULE_AUTHOR("Red Hat, Inc.");
 30MODULE_LICENSE("GPL");
 31
 32struct kmem_cache *cachefiles_object_jar;
 33
 34static struct miscdevice cachefiles_dev = {
 35	.minor	= MISC_DYNAMIC_MINOR,
 36	.name	= "cachefiles",
 37	.fops	= &cachefiles_daemon_fops,
 38};
 39
 40static void cachefiles_object_init_once(void *_object)
 41{
 42	struct cachefiles_object *object = _object;
 43
 44	memset(object, 0, sizeof(*object));
 45	spin_lock_init(&object->work_lock);
 46}
 47
 48/*
 49 * initialise the fs caching module
 50 */
 51static int __init cachefiles_init(void)
 52{
 53	int ret;
 54
 55	ret = misc_register(&cachefiles_dev);
 56	if (ret < 0)
 57		goto error_dev;
 58
 59	/* create an object jar */
 60	ret = -ENOMEM;
 61	cachefiles_object_jar =
 62		kmem_cache_create("cachefiles_object_jar",
 63				  sizeof(struct cachefiles_object),
 64				  0,
 65				  SLAB_HWCACHE_ALIGN,
 66				  cachefiles_object_init_once);
 67	if (!cachefiles_object_jar) {
 68		pr_notice("Failed to allocate an object jar\n");
 
 69		goto error_object_jar;
 70	}
 71
 72	ret = cachefiles_proc_init();
 73	if (ret < 0)
 74		goto error_proc;
 75
 76	pr_info("Loaded\n");
 77	return 0;
 78
 79error_proc:
 80	kmem_cache_destroy(cachefiles_object_jar);
 81error_object_jar:
 82	misc_deregister(&cachefiles_dev);
 83error_dev:
 84	pr_err("failed to register: %d\n", ret);
 85	return ret;
 86}
 87
 88fs_initcall(cachefiles_init);
 89
 90/*
 91 * clean up on module removal
 92 */
 93static void __exit cachefiles_exit(void)
 94{
 95	pr_info("Unloading\n");
 96
 97	cachefiles_proc_cleanup();
 98	kmem_cache_destroy(cachefiles_object_jar);
 99	misc_deregister(&cachefiles_dev);
100}
101
102module_exit(cachefiles_exit);

 
  1/* Network filesystem caching backend to use cache files on a premounted
  2 * filesystem
  3 *
  4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
  5 * Written by David Howells (dhowells@redhat.com)
  6 *
  7 * This program is free software; you can redistribute it and/or
  8 * modify it under the terms of the GNU General Public Licence
  9 * as published by the Free Software Foundation; either version
 10 * 2 of the Licence, or (at your option) any later version.
 11 */
 12
 13#include <linux/module.h>
 14#include <linux/init.h>
 15#include <linux/sched.h>
 16#include <linux/completion.h>
 17#include <linux/slab.h>
 18#include <linux/fs.h>
 19#include <linux/file.h>
 20#include <linux/namei.h>
 21#include <linux/mount.h>
 22#include <linux/statfs.h>
 23#include <linux/sysctl.h>
 24#include <linux/miscdevice.h>
 
 25#include "internal.h"
 26
 27unsigned cachefiles_debug;
 28module_param_named(debug, cachefiles_debug, uint, S_IWUSR | S_IRUGO);
 29MODULE_PARM_DESC(cachefiles_debug, "CacheFiles debugging mask");
 30
 31MODULE_DESCRIPTION("Mounted-filesystem based cache");
 32MODULE_AUTHOR("Red Hat, Inc.");
 33MODULE_LICENSE("GPL");
 34
 35struct kmem_cache *cachefiles_object_jar;
 36
 37static struct miscdevice cachefiles_dev = {
 38	.minor	= MISC_DYNAMIC_MINOR,
 39	.name	= "cachefiles",
 40	.fops	= &cachefiles_daemon_fops,
 41};
 42
 43static void cachefiles_object_init_once(void *_object)
 44{
 45	struct cachefiles_object *object = _object;
 46
 47	memset(object, 0, sizeof(*object));
 48	spin_lock_init(&object->work_lock);
 49}
 50
 51/*
 52 * initialise the fs caching module
 53 */
 54static int __init cachefiles_init(void)
 55{
 56	int ret;
 57
 58	ret = misc_register(&cachefiles_dev);
 59	if (ret < 0)
 60		goto error_dev;
 61
 62	/* create an object jar */
 63	ret = -ENOMEM;
 64	cachefiles_object_jar =
 65		kmem_cache_create("cachefiles_object_jar",
 66				  sizeof(struct cachefiles_object),
 67				  0,
 68				  SLAB_HWCACHE_ALIGN,
 69				  cachefiles_object_init_once);
 70	if (!cachefiles_object_jar) {
 71		printk(KERN_NOTICE
 72		       "CacheFiles: Failed to allocate an object jar\n");
 73		goto error_object_jar;
 74	}
 75
 76	ret = cachefiles_proc_init();
 77	if (ret < 0)
 78		goto error_proc;
 79
 80	printk(KERN_INFO "CacheFiles: Loaded\n");
 81	return 0;
 82
 83error_proc:
 84	kmem_cache_destroy(cachefiles_object_jar);
 85error_object_jar:
 86	misc_deregister(&cachefiles_dev);
 87error_dev:
 88	kerror("failed to register: %d", ret);
 89	return ret;
 90}
 91
 92fs_initcall(cachefiles_init);
 93
 94/*
 95 * clean up on module removal
 96 */
 97static void __exit cachefiles_exit(void)
 98{
 99	printk(KERN_INFO "CacheFiles: Unloading\n");
100
101	cachefiles_proc_cleanup();
102	kmem_cache_destroy(cachefiles_object_jar);
103	misc_deregister(&cachefiles_dev);
104}
105
106module_exit(cachefiles_exit);