cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

main.c (2162B)

      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);