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) 2021 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#include <linux/netfs.h>
22#include <trace/events/netfs.h>
23#define CREATE_TRACE_POINTS
24#include "internal.h"
25
26unsigned cachefiles_debug;
27module_param_named(debug, cachefiles_debug, uint, S_IWUSR | S_IRUGO);
28MODULE_PARM_DESC(cachefiles_debug, "CacheFiles debugging mask");
29
30MODULE_DESCRIPTION("Mounted-filesystem based cache");
31MODULE_AUTHOR("Red Hat, Inc.");
32MODULE_LICENSE("GPL");
33
34struct kmem_cache *cachefiles_object_jar;
35
36static struct miscdevice cachefiles_dev = {
37	.minor	= MISC_DYNAMIC_MINOR,
38	.name	= "cachefiles",
39	.fops	= &cachefiles_daemon_fops,
40};
41
 
 
 
 
 
 
 
 
42/*
43 * initialise the fs caching module
44 */
45static int __init cachefiles_init(void)
46{
47	int ret;
48
49	ret = cachefiles_register_error_injection();
50	if (ret < 0)
51		goto error_einj;
52	ret = misc_register(&cachefiles_dev);
53	if (ret < 0)
54		goto error_dev;
55
56	/* create an object jar */
57	ret = -ENOMEM;
58	cachefiles_object_jar =
59		kmem_cache_create("cachefiles_object_jar",
60				  sizeof(struct cachefiles_object),
61				  0, SLAB_HWCACHE_ALIGN, NULL);
 
 
62	if (!cachefiles_object_jar) {
63		pr_notice("Failed to allocate an object jar\n");
64		goto error_object_jar;
65	}
66
 
 
 
 
67	pr_info("Loaded\n");
68	return 0;
69
 
 
70error_object_jar:
71	misc_deregister(&cachefiles_dev);
72error_dev:
73	cachefiles_unregister_error_injection();
74error_einj:
75	pr_err("failed to register: %d\n", ret);
76	return ret;
77}
78
79fs_initcall(cachefiles_init);
80
81/*
82 * clean up on module removal
83 */
84static void __exit cachefiles_exit(void)
85{
86	pr_info("Unloading\n");
87
 
88	kmem_cache_destroy(cachefiles_object_jar);
89	misc_deregister(&cachefiles_dev);
90	cachefiles_unregister_error_injection();
91}
92
93module_exit(cachefiles_exit);

  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);